/*
 * tempmail.jp - Cyberpunk/Futuristic Dark Theme
 * Near-future tech aesthetic with neon accents
 */

:root {
  /* Base colors - Deep space dark */
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-tertiary: #1a1a24;
  --bg-card: #12121a;
  --bg-hover: #1e1e2a;
  
  /* Neon accents */
  --neon-cyan: #00f0ff;
  --neon-magenta: #ff00aa;
  --neon-purple: #b829dd;
  --neon-blue: #0088ff;
  --neon-green: #00ff9d;

  /* Alias */
  --accent-primary: var(--neon-cyan);
  --accent-secondary: var(--neon-purple);
  
  /* Text colors */
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-tertiary: #606070;
  --text-muted: #404050;
  
  /* Status colors */
  --status-online: #00ff9d;
  --status-busy: #ff6b35;
  --status-offline: #606070;
  
  /* Borders */
  --border-color: #2a2a3a;
  --border-glow: rgba(0, 240, 255, 0.3);
  
  /* Fonts */
  --font-primary: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated grid background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -1;
}

/* Ambient light effect */
.ambient-light {
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, 
    rgba(0, 240, 255, 0.05) 0%, 
    rgba(184, 41, 221, 0.03) 30%, 
    transparent 60%);
  animation: ambientPulse 20s ease-in-out infinite;
  pointer-events: none;
  z-index: -1;
}

@keyframes ambientPulse {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.5; }
  50% { transform: translate(-2%, -2%) scale(1.1); opacity: 0.8; }
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(180deg, var(--bg-secondary) 0%, transparent 100%);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neon-cyan) 0%, var(--neon-blue) 100%);
  border-radius: var(--radius-md);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
}

.logo-icon svg {
  width: 24px;
  height: 24px;
  color: var(--bg-primary);
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-online);
  box-shadow: 0 0 10px var(--status-online);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-left: var(--spacing-md);
  padding: 4px 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 8px;
  cursor: pointer;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--neon-cyan);
  color: var(--bg-primary);
}

/* Language switch for subpages (side-by-side one-tap) */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-right: var(--spacing-sm);
  padding: 3px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.lang-switch-inline {
  margin-right: var(--spacing-sm);
}

/* Theme toggle button */
.theme-toggle-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin-right: var(--spacing-sm);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-secondary);
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 8px var(--neon-cyan);
}

/* Light mode theme toggle styles */
[data-theme="light"] .theme-toggle-btn {
  background: #e0e0e0;
  border-color: #ccc;
  color: #666;
}

[data-theme="light"] .theme-toggle-btn:hover {
  background: #d0d0d0;
  color: #333;
  border-color: #999;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* Sections */
section {
  margin-bottom: var(--spacing-xl);
}

/* Address Card */
.address-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.address-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    var(--neon-cyan) 20%, 
    var(--neon-purple) 50%, 
    var(--neon-cyan) 80%, 
    transparent 100%);
}

.section-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
}

/* Address Display */
.address-display {
  margin-bottom: var(--spacing-md);
}

.address-box {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: all var(--transition-normal);
}

.address-box:focus-within {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.1);
}

#email-address {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--neon-cyan);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.icon-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.icon-btn:hover {
  background: rgba(0,240,255,0.12);
  border-color: rgba(0,240,255,0.4);
  color: var(--neon-cyan);
}

.icon-btn-edit {
  opacity: 0.6;
}
.icon-btn-edit:hover {
  opacity: 1;
}

/* 更新ボタン（アイコンのみ、スピン対応） */
.icon-btn-refresh {
  border-color: rgba(0,240,255,0.2);
}
.icon-btn-refresh:hover {
  background: rgba(0,240,255,0.1);
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}
.icon-btn-refresh.spinning svg {
  animation: spin 0.7s linear infinite;
}

/* OTP抽出ボタン */
.icon-btn-otp {
  border-color: rgba(0, 255, 157, 0.2);
  color: var(--neon-green);
}
.icon-btn-otp:hover {
  background: rgba(0, 255, 157, 0.1);
  border-color: var(--neon-green);
  color: var(--neon-green);
  box-shadow: 0 0 12px rgba(0, 255, 157, 0.3);
}
.icon-btn-otp:disabled,
.icon-btn-otp.searching {
  opacity: 0.6;
  cursor: wait;
}
.icon-btn-otp.searching svg {
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.95); }
}

/* OTP検索で見つかったメールのハイライト */
.mail-item.otp-highlight {
  border-color: var(--neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 157, 0.3), inset 0 0 0 1px rgba(0, 255, 157, 0.5);
  animation: otpPulse 3s ease-in-out;
}

@keyframes otpPulse {
  0% { box-shadow: 0 0 20px rgba(0, 255, 157, 0.3), inset 0 0 0 1px rgba(0, 255, 157, 0.5); }
  50% { box-shadow: 0 0 30px rgba(0, 255, 157, 0.5), inset 0 0 0 2px rgba(0, 255, 157, 0.8); }
  100% { box-shadow: 0 0 20px rgba(0, 255, 157, 0.3), inset 0 0 0 1px rgba(0, 255, 157, 0.5); }
}

.icon-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.address-hint {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: 6px;
}

.address-hint::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--neon-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--neon-green);
}

/* Address Input (Custom Address) */
.address-input-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.address-input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.address-input:focus {
  outline: none;
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.1);
}

.address-input::placeholder {
  color: var(--text-muted);
}

.domain-suffix {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* Buttons */
.address-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-cyan) 0%, var(--neon-blue) 100%);
  color: var(--bg-primary);
  box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 240, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}

.btn-sm {
  padding: 4px 10px !important;
  font-size: 12px !important;
  min-height: unset;
  height: auto;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* Mailbox Section */
.mailbox-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.section-header .section-title {
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 8px;
  background: var(--neon-purple);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(184, 41, 221, 0.4);
}

/* Toggle Switch */
.toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.toggle input {
  display: none;
}

.toggle-slider {
  width: 44px;
  height: 24px;
  background: var(--bg-tertiary);
  border-radius: 12px;
  position: relative;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.toggle input:checked + .toggle-slider {
  background: rgba(0, 255, 157, 0.2);
  border-color: var(--neon-green);
}

.toggle input:checked + .toggle-slider::before {
  left: 22px;
  background: var(--neon-green);
  box-shadow: 0 0 10px var(--neon-green);
}

.toggle-label {
  font-size: 0.75rem;
  font-weight: 500;
}

/* Mail List */
.mail-list {
  max-height: 500px;
  overflow-y: auto;
  min-height: 0;
  /* Height is content-driven; no fixed min */
}

.mail-list::-webkit-scrollbar {
  width: 6px;
}

.mail-list::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

.mail-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.mail-list::-webkit-scrollbar-thumb:hover {
  background: var(--neon-cyan);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  color: var(--text-tertiary);
  text-align: center;
}

.empty-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-icon svg {
  width: 100%;
  height: 100%;
  stroke: var(--neon-cyan);
  stroke-width: 1;
  fill: none;
}

.empty-state p {
  margin: 0;
  font-size: 0.875rem;
}

.empty-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* Mail Item */
.mail-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.mail-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: transparent;
  transition: all var(--transition-fast);
}

.mail-item:hover {
  background: var(--bg-hover);
}

.mail-item.unread::before {
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
}

.mail-item.unread .mail-subject {
  color: var(--text-primary);
  font-weight: 600;
}

.mail-item.unread .mail-subject::after {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--neon-magenta);
  border-radius: 50%;
  margin-left: 8px;
  box-shadow: 0 0 8px var(--neon-magenta);
}

.mail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
}

.mail-subject {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mail-time {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.mail-from {
  font-size: 0.8125rem;
  color: var(--neon-purple);
  margin-bottom: var(--spacing-xs);
  font-family: var(--font-mono);
}

.mail-preview {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* メールアイテムのレイアウト（星マーク対応） */
.mail-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.mail-content-wrapper {
  flex: 1;
  min-width: 0;
  padding-right: var(--spacing-sm);
}

.mail-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

/* 星マーク（保存/未保存） */
.mail-star {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
}

.mail-star:hover {
  background: var(--bg-hover);
  transform: scale(1.1);
}

.mail-star.saved {
  background: rgba(255, 215, 0, 0.1);
  border-color: #FFD700;
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

.mail-star.saved:hover {
  background: rgba(255, 215, 0, 0.2);
}

.mail-star.unsaved:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 8px var(--neon-cyan);
}

.mail-star svg {
  transition: all var(--transition-fast);
}

/* 認証コード表示 */
.mail-auth-code {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin: var(--spacing-xs) 0;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(0, 255, 157, 0.1);
  border: 1px solid var(--neon-green);
  border-radius: var(--radius-sm);
  width: fit-content;
}

.auth-code-label {
  font-size: 0.75rem;
  color: var(--neon-green);
  font-weight: 600;
}

.auth-code-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-green);
  letter-spacing: 0.1em;
}

/* 未保存警告 */
.mail-not-saved-warning {
  font-size: 0.75rem;
  color: var(--status-busy);
  margin-top: var(--spacing-xs);
  opacity: 0.8;
}

/* Info Section */
.info-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.step-number {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neon-purple) 0%, var(--neon-magenta) 100%);
  border-radius: 50%;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 0 15px rgba(184, 41, 221, 0.4);
}

.step p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.step-arrow {
  color: var(--neon-cyan);
  font-size: 1.5rem;
  opacity: 0.6;
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

.footer-hint {
  margin-top: var(--spacing-xs);
  color: var(--text-muted);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 700px;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: modalSlide 0.3s ease;
}

@keyframes modalSlide {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--neon-magenta);
}

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  max-height: 60vh;
}

.mail-meta {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.meta-row {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
  font-size: 0.875rem;
}

.meta-row:last-child {
  margin-bottom: 0;
}

.meta-label {
  color: var(--text-tertiary);
  min-width: 80px;
  font-weight: 500;
}

.mail-body {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-secondary);
  overflow-wrap: break-word;
  white-space: pre-wrap;
}

.mail-body a {
  color: var(--neon-cyan);
  text-decoration: none;
}

.mail-body a:hover {
  text-decoration: underline;
}

/* Reply Section in Modal */
.reply-section {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.reply-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.reply-title svg {
  width: 16px;
  height: 16px;
  color: var(--neon-cyan);
}

.reply-input {
  width: 100%;
  min-height: 120px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 0.9375rem;
  resize: vertical;
  transition: all var(--transition-fast);
}

.reply-input:focus {
  outline: none;
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.1);
}

.reply-input::placeholder {
  color: var(--text-muted);
}

.reply-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.modal-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

/* Toast */
.toast {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 2000;
  opacity: 0;
  transition: all 0.3s ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  border-color: var(--neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 157, 0.2);
}

.toast.error {
  border-color: var(--neon-magenta);
  box-shadow: 0 0 20px rgba(255, 0, 170, 0.2);
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
  }
  
  .header {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .logo-text {
    font-size: 1.25rem;
  }
  
  .container {
    padding: var(--spacing-md);
  }
  
  .address-box {
    flex-direction: column;
    align-items: stretch;
  }
  
  #email-address {
    font-size: 0.9375rem;
    word-break: break-all;
  }
  
  .icon-btn {
    align-self: flex-end;
  }
  
  .address-actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .section-header {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-start;
  }
  
  .steps {
    flex-direction: column;
  }
  
  .step-arrow {
    transform: rotate(90deg);
  }
  
  .modal-content {
    max-height: 95vh;
  }
  
  .modal-body {
    padding: var(--spacing-md);
  }
  
  .modal-footer {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .modal-footer .btn {
    width: 100%;
  }
}

/* Animations for loading states */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading {
  animation: spin 1s linear infinite;
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
}

/* Selection color */
::selection {
  background: rgba(0, 240, 255, 0.3);
  color: var(--text-primary);
}

/* Mail Frame for HTML emails */
.mail-frame {
  width: 100%;
  min-height: 200px;
  max-height: 600px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #ffffff;
  overflow: hidden;
  display: block;
  box-sizing: border-box;
}

/* Auth Section - Login/Create Forms */
.auth-section {
  max-width: 480px;
  margin: var(--spacing-xl) auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
}

.auth-tab {
  flex: 1;
  padding: var(--spacing-md);
  text-align: center;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-secondary);
}

.auth-tab:hover {
  color: var(--neon-cyan);
  background: var(--bg-hover);
}

.auth-tab.active {
  color: var(--neon-cyan);
  background: var(--bg-card);
  border-bottom: 2px solid var(--neon-cyan);
  margin-bottom: -1px;
}

.auth-form {
  padding: var(--spacing-lg);
}

.create-info {
  background: linear-gradient(135deg, rgba(184, 41, 221, 0.1) 0%, rgba(255, 0, 170, 0.1) 100%);
  border: 1px solid var(--neon-purple);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.create-info p {
  color: var(--neon-magenta);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.create-info .text-small {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-bottom: 0;
}

/* Password Section */
.password-section {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.password-box {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
}

#display-password {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--neon-cyan);
  letter-spacing: 0.05em;
}

/* Address Actions Top (API/Settings buttons) */
.address-actions-top {
  display: flex;
  gap: var(--spacing-xs);
}

/* Sidebar (API/Settings Menu) */
.sidebar {
  position: fixed;
  top: 0;
  right: -320px;
  width: 320px;
  height: 100%;
  background: var(--bg-card);
  border-left: 1px solid var(--border-color);
  z-index: 1500;
  transition: right var(--transition-normal);
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
}

.sidebar.active {
  right: 0;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--neon-cyan);
}

.sidebar-content {
  flex: 1;
  padding: var(--spacing-md);
  overflow-y: auto;
}

.api-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.api-method {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: var(--spacing-xs);
  color: #fff;
}

.api-method:contains("GET") {
  background: var(--neon-green);
}

.api-method:contains("POST") {
  background: var(--neon-blue);
}

.api-method:contains("DELETE") {
  background: var(--neon-magenta);
}

.api-endpoint {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--neon-cyan);
  word-break: break-all;
}

.api-desc {
  margin-top: var(--spacing-xs);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.menu-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9375rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: var(--spacing-sm);
}

.menu-item:hover {
  background: var(--bg-hover);
  border-color: var(--neon-cyan);
}

.menu-item svg {
  color: var(--neon-cyan);
}

.menu-item-danger {
  color: var(--neon-magenta);
  border-color: rgba(255, 0, 170, 0.3);
}

.menu-item-danger:hover {
  background: rgba(255, 0, 170, 0.1);
  border-color: var(--neon-magenta);
}

.menu-item-danger svg {
  color: var(--neon-magenta);
}

/* Overlay for sidebar */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: blur(5px);
  z-index: 1400;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ===== NEW STYLES FOR REDESIGNED UI ===== */

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--spacing-md);
  height: 64px;
  background: rgba(10, 10, 15, 0.88);
  border-bottom: 1px solid rgba(0, 240, 255, 0.12);
  position: sticky;
  top: 0;
  z-index: 200;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  min-width: 0;
}

/* 右側ナビ（言語 + ハンバーガー） */
.nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* メールカウンター（ナビバー用） */
.nav-mail-counter {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-sm);
  color: var(--neon-cyan);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.nav-mail-counter:hover {
  background: rgba(0, 240, 255, 0.15);
  border-color: rgba(0, 240, 255, 0.4);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}
.nav-mail-counter svg {
  width: 16px;
  height: 16px;
}
.nav-counter-value {
  min-width: 18px;
  text-align: center;
}

/* ハンバーガーボタン */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  padding: 8px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.hamburger-btn:hover {
  background: rgba(0,240,255,0.1);
  border-color: rgba(0,240,255,0.3);
}
.hamburger-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: background var(--transition-fast);
}
.hamburger-btn:hover span {
  background: var(--neon-cyan);
}

/* ドロワーオーバーレイ */
.drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(3px);
  z-index: 300;
}
.drawer-overlay.active {
  display: block;
}

/* ドロワー本体 */
.drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  max-width: 85vw;
  height: 100%;
  background: var(--bg-card);
  border-left: 1px solid rgba(0,240,255,0.12);
  z-index: 400;
  transition: right 0.28s cubic-bezier(0.4,0,0.2,1);
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 40px rgba(0,0,0,0.4);
}
.drawer.active {
  right: 0;
}

.drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  background: var(--bg-secondary);
}
.drawer-title {
  font-size: 1rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.drawer-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.drawer-close:hover {
  background: var(--bg-hover);
  color: var(--neon-magenta);
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px 12px;
}

.drawer-section {
  margin-bottom: 4px;
}

.drawer-section-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: rgba(255,255,255,0.3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 8px 8px 4px;
}

.drawer-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}
.drawer-item:hover {
  background: rgba(0,240,255,0.06);
  border-color: rgba(0,240,255,0.18);
  color: #fff;
}
.drawer-item svg {
  color: var(--neon-cyan);
  flex-shrink: 0;
}

.drawer-item-danger {
  color: rgba(255,80,120,0.9);
}
.drawer-item-danger:hover {
  background: rgba(255,0,100,0.08);
  border-color: rgba(255,0,100,0.3);
  color: var(--neon-magenta);
}
.drawer-item-danger svg {
  color: var(--neon-magenta);
}

.drawer-divider {
  height: 1px;
  background: rgba(255,255,255,0.07);
  margin: 6px 0;
}

/* body に drawer-open クラスがついた時はスクロール無効 */
body.drawer-open {
  overflow: hidden;
}

/* Drawer footer with register button */
.drawer-footer {
  padding: 12px 16px 16px;
  border-top: 1px solid rgba(255,255,255,0.07);
  display: flex;
  justify-content: flex-end;
}

.drawer-register-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: rgba(0,240,255,0.08);
  border: 1px solid rgba(0,240,255,0.25);
  border-radius: var(--radius-md);
  color: var(--neon-cyan);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: not-allowed;
  opacity: 0.55;
  transition: all var(--transition-fast);
}

/* New address confirm footer */
.new-addr-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  flex-wrap: wrap;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.nav-logo-wrap {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(0,240,255,0.15) 0%, rgba(0,136,255,0.1) 100%);
  border: 1px solid rgba(0,240,255,0.25);
  border-radius: 8px;
}

.nav-logo {
  width: 18px;
  height: 18px;
  color: var(--neon-cyan);
}

.nav-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, #fff 0%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 3px;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none; /* Firefox */
}
.nav-menu::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

/* 危険アクションのナビボタン */
.nav-item-danger {
  color: rgba(255, 60, 120, 0.8);
}
.nav-item-danger:hover {
  background: rgba(255, 0, 100, 0.08) !important;
  border-color: rgba(255, 0, 100, 0.35) !important;
  color: var(--neon-magenta) !important;
}
.nav-item-danger svg {
  color: var(--neon-magenta);
}

.nav-item:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(0,240,255,0.2);
  color: var(--text-primary);
}

.nav-item svg {
  flex-shrink: 0;
  opacity: 0.85;
  color: var(--neon-cyan);
}

/* アイコンのみボタン */
.nav-item-icon {
  padding: 6px 8px;
}

/* ナビアクショングループ（ログイン後のみ表示） */
.nav-actions {
  display: none;
  align-items: center;
  gap: 2px;
}

.nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--neon-magenta);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 9px;
}

.nav-divider {
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,0.1);
  margin: 0 4px;
}

/* Main */
.main {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* Auth Container */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: calc(100vh - 200px);
  padding-top: var(--spacing-xl);
}

.auth-card {
  width: 100%;
  max-width: 480px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.auth-header {
  padding: var(--spacing-lg);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.auth-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Auth Toggle */
.auth-toggle {
  display: flex;
  border-bottom: 1px solid var(--border-color);
}

.auth-toggle-btn {
  flex: 1;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: none;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.auth-toggle-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.auth-toggle-btn.active {
  color: var(--neon-cyan);
  background: var(--bg-card);
}

.auth-toggle-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
}

/* Auth Forms */
.auth-form {
  padding: var(--spacing-lg);
}

.form-notice {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.1) 0%, rgba(0, 136, 255, 0.1) 100%);
  border: 1px solid var(--neon-cyan);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.form-notice svg {
  flex-shrink: 0;
  color: var(--neon-cyan);
}

.form-notice p {
  font-weight: 600;
  color: var(--neon-cyan);
  margin-bottom: 4px;
}

.form-notice span {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0 var(--spacing-sm);
  transition: all var(--transition-fast);
  min-width: 0;
  overflow: hidden;
}

.input-wrapper:focus-within {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.1);
}

.input-icon {
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.form-input {
  flex: 1;
  padding: var(--spacing-sm) 0;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-mono);
  outline: none;
  min-width: 0;
  width: 100%;
}

.form-input::placeholder {
  color: var(--text-muted);
}

/* Buttons */
.btn-large {
  width: 100%;
  padding: var(--spacing-md);
  font-size: 1rem;
  justify-content: center;
}

.btn-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: 0;
}

.btn-icon:hover {
  background: var(--neon-cyan);
  border-color: var(--neon-cyan);
  color: var(--bg-primary);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

.btn-icon-sm {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.btn-icon-sm svg {
  width: 16px;
  height: 16px;
}

.btn-danger {
  background: linear-gradient(135deg, #ff4757 0%, #ff6348 100%);
  color: var(--text-primary);
  border: none;
}

.btn-danger:hover {
  box-shadow: 0 4px 15px rgba(255, 71, 87, 0.4);
}

/* Mailbox Container */
.mailbox-container {
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Info Card */
.info-card {
  display: flex;
  align-items: stretch;
  gap: var(--spacing-md);
  background: linear-gradient(135deg, rgba(0,240,255,0.04) 0%, rgba(0,136,255,0.02) 100%);
  border: 1px solid rgba(0, 240, 255, 0.18);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: nowrap;
  overflow-x: auto;
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.04), inset 0 1px 0 rgba(255,255,255,0.04);
}

.info-section {
  flex: 1 1 auto;
  min-width: 0;
}

.info-section:first-child {
  flex: 2 1 auto;
}

.info-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  color: rgba(0,240,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.info-value-box {
  display: flex;
  align-items: center;
  gap: 5px;
  background: rgba(0,0,0,0.35);
  border: 1px solid rgba(0,240,255,0.1);
  border-radius: var(--radius-sm);
  padding: 7px 7px 7px 10px;
  overflow: hidden;
  max-width: 100%;
  width: 100%;
  min-width: 0;
  transition: border-color var(--transition-fast);
}

.info-value-box:hover {
  border-color: rgba(0,240,255,0.25);
}

.info-value {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--neon-cyan);
  white-space: normal;
  overflow-wrap: break-word;
  word-break: break-all;
  min-width: 0;
}

.info-value-password {
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

/* パスワード表示用のスタイル */
.password-dots {
  letter-spacing: 0.1em;
  font-family: var(--font-mono);
}

.info-divider {
  width: 1px;
  background: var(--border-color);
  margin: var(--spacing-xs) 0;
}

@media (max-width: 768px) {
  .info-card {
    flex-wrap: wrap;
  }
  
  .info-section {
    min-width: 100%;
  }
  
  .info-divider {
    width: 100%;
    height: 1px;
  }
}

/* Mail Card */
.mail-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.mail-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.mail-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.125rem;
  font-weight: 600;
}

.mail-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 7px;
  background: rgba(184,41,221,0.3);
  border: 1px solid rgba(184,41,221,0.4);
  color: rgba(255,255,255,0.7);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 11px;
  transition: all var(--transition-fast);
}

.mail-count.has-unread {
  background: var(--neon-magenta);
  border-color: var(--neon-magenta);
  color: #fff;
  box-shadow: 0 0 8px rgba(255,0,170,0.5);
}

.mail-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Toggle Small */
.toggle-sm {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.toggle-sm input {
  display: none;
}

.toggle-slider-sm {
  width: 36px;
  height: 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  position: relative;
  transition: all var(--transition-fast);
}

.toggle-slider-sm::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.toggle-sm input:checked + .toggle-slider-sm {
  background: rgba(0, 255, 157, 0.2);
  border-color: var(--neon-green);
}

.toggle-sm input:checked + .toggle-slider-sm::before {
  left: 18px;
  background: var(--neon-green);
  box-shadow: 0 0 8px var(--neon-green);
}

/* API List */
.api-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.api-entry {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.api-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
  flex-wrap: wrap;
}

.api-method {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--bg-primary);
}

.api-method.get {
  background: var(--neon-green);
}

.api-method.post {
  background: var(--neon-blue);
}

.api-method.delete {
  background: var(--neon-magenta);
}

.api-entry code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--neon-cyan);
}

.api-entry p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

.api-example {
  margin-top: var(--spacing-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.api-example pre {
  margin: 0;
  padding: var(--spacing-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
}

.api-example code {
  color: var(--neon-cyan);
  font-family: inherit;
}

/* PUT method style */
.api-method.put {
  background: #ffaa00;
  color: var(--bg-primary);
}

/* Settings List */
.settings-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.settings-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: 14px var(--spacing-md);
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}

.settings-item:hover {
  background: rgba(0,240,255,0.06);
  border-color: rgba(0,240,255,0.25);
  color: #fff;
}

.settings-item svg {
  color: var(--neon-cyan);
  flex-shrink: 0;
}

.settings-item-danger {
  color: rgba(255,60,120,0.9);
  border-color: rgba(255,0,100,0.2);
}

.settings-item-danger:hover {
  background: rgba(255,0,100,0.08);
  border-color: var(--neon-magenta);
  color: var(--neon-magenta);
}

.settings-item-danger svg {
  color: var(--neon-magenta);
}

.settings-divider {
  height: 1px;
  background: rgba(255,255,255,0.07);
  margin: 4px 0;
}

/* Password Save Box (in warning modal) */
.password-save-box {
  width: 100%;
  background: rgba(0,0,0,0.3);
  border: 1px solid rgba(0,240,255,0.15);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.password-save-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.password-save-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: rgba(0,240,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.password-save-value {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--neon-cyan);
  word-break: break-all;
}

/* Password Strength Meter */
.pw-strength-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}

.pw-strength-bar {
  flex: 1;
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  overflow: hidden;
}

.pw-strength-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.3s ease, background 0.3s ease;
}

.pw-strength-fill.weak   { background: #ff4444; }
.pw-strength-fill.medium { background: #ffaa00; }
.pw-strength-fill.strong { background: var(--neon-green); }

.pw-strength-label {
  font-size: 0.72rem;
  font-weight: 600;
  min-width: 28px;
}
.pw-strength-label.weak   { color: #ff4444; }
.pw-strength-label.medium { color: #ffaa00; }
.pw-strength-label.strong { color: var(--neon-green); }

.pw-match-msg {
  font-size: 0.75rem;
  margin-top: 5px;
  min-height: 16px;
}
.pw-match-msg.match    { color: var(--neon-green); }
.pw-match-msg.no-match { color: #ff4444; }

/* Modal Variants */
.modal-content-sm {
  max-width: 420px;
  width: 90vw;
}

.modal-content-xs {
  max-width: 360px;
}

.modal-content-lg {
  max-width: 800px;
}

.modal-body-center {
  text-align: center;
  padding: var(--spacing-xl);
}

.modal-footer-center {
  justify-content: center;
  gap: var(--spacing-md);
}

/* Confirm Modal */
.confirm-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.confirm-icon.warning {
  background: rgba(255, 107, 53, 0.1);
  color: #ff6b35;
}

.confirm-icon.danger {
  background: rgba(255, 0, 170, 0.1);
  color: var(--neon-magenta);
}

.confirm-icon.info {
  background: rgba(0, 240, 255, 0.1);
  color: var(--neon-cyan);
}

.confirm-icon svg {
  width: 32px;
  height: 32px;
}

#confirm-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

#confirm-message {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  white-space: pre-line;
}

/* Mail Detail Meta */
.mail-detail-meta {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.meta-item {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
  font-size: 0.875rem;
}

.meta-item:last-child {
  margin-bottom: 0;
}

.meta-label {
  color: var(--text-tertiary);
  min-width: 50px;
  font-weight: 500;
}

.meta-value {
  color: var(--text-primary);
  word-break: break-all;
}

.mail-detail-body {
  min-height: 100px;
}

.mail-body-text {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
}

/* Password Strength Indicator */
.password-strength {
  margin: var(--spacing-md) 0;
}

.strength-bar {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.strength-bar::after {
  content: '';
  display: block;
  height: 100%;
  width: var(--strength, 0%);
  background: var(--strength-color, transparent);
  transition: all var(--transition-fast);
}

.strength-text {
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
  display: block;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: var(--spacing-xs);
  display: block;
}

/* Loading State */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(0, 243, 255, 0.1);
  border-top-color: var(--neon-cyan);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
  box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
}

.mail-body-text a {
  color: var(--neon-cyan);
  text-decoration: none;
}

.mail-body-text a:hover {
  text-decoration: underline;
}

/* Loading Animation */
.loading {
  animation: spin 1s linear infinite;
  transform-origin: center;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Toast Improvements */
.toast-icon {
  flex-shrink: 0;
}

/* Responsive Improvements */
@media (max-width: 768px) {
  .navbar {
    padding: 0 var(--spacing-sm);
    height: 60px;
  }

  .nav-title {
    font-size: 1rem;
  }

  .nav-menu {
    gap: 2px;
  }

  .nav-item {
    padding: 6px 8px;
    font-size: 0.75rem;
    gap: 4px;
  }

  .main {
    padding: var(--spacing-sm);
  }

  /* info-card: スマホでは縦並び */
  .info-card {
    flex-direction: column;
    gap: 10px;
    padding: 14px;
  }

  .info-section {
    min-width: 0;
    width: 100%;
  }

  .info-section:first-child {
    flex: unset;
  }

  .info-divider {
    width: 100%;
    height: 1px;
    margin: 0;
  }

  .info-value-box {
    flex-wrap: nowrap;
  }

  .info-value {
    font-size: 0.8rem;
    word-break: break-all;
  }

  /* mail header bar */
  .mail-header-bar {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
  }

  .mail-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
  }

  .modal-content {
    margin: 12px;
    max-height: calc(100dvh - 24px);
    width: calc(100% - 24px);
  }

  .modal-body {
    padding: var(--spacing-md);
  }

  .btn-large {
    padding: var(--spacing-sm);
  }

  .auth-form {
    padding: var(--spacing-md);
  }

  /* Mail list: remove fixed max-height on mobile to avoid huge empty space */
  .mail-list {
    max-height: none;
    overflow-y: visible;
  }

  /* Mail modal: use most of screen height */
  #mail-modal .modal-content {
    max-height: calc(100dvh - 16px);
    margin: 8px;
    width: calc(100% - 16px);
    display: flex;
    flex-direction: column;
  }
  #mail-modal .modal-body {
    flex: 1;
    max-height: none;
    overflow-y: auto;
    padding: 12px;
  }

  /* Mail iframe: keep original email layout and fit by JS scaling */
  .mail-frame {
    width: 100%;
    min-height: 180px;
    max-height: none;
  }

  .mail-detail-body {
    overflow-x: hidden;
  }

  /* Modal footer for mail detail: stack buttons nicely */
  #mail-modal .modal-footer {
    flex-direction: column-reverse;
    gap: 8px;
    padding: 12px 16px;
    flex-shrink: 0;
  }
  #mail-modal .modal-footer .btn {
    width: 100%;
    justify-content: center;
  }

  /* New-address confirm modal footer: wrap buttons */
  .new-addr-footer {
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 16px;
  }
  .new-addr-footer .btn {
    flex: 1 1 auto;
    min-width: 80px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .navbar {
    height: 56px;
  }

  .nav-title {
    font-size: 0.9rem;
  }

  /* テキストラベルを非表示にしてアイコンのみ */
  .nav-item span {
    display: none;
  }
  .nav-item {
    padding: 6px 8px;
  }

  .lang-switch {
    margin-left: 0;
  }

  .lang-btn {
    padding: 3px 6px;
    font-size: 0.625rem;
  }

  .info-card {
    padding: 12px;
    gap: 8px;
  }

  .info-label {
    font-size: 0.62rem;
  }

  .info-value {
    font-size: 0.78rem;
  }

  .icon-btn {
    width: 30px;
    height: 30px;
  }

  .mail-title {
    font-size: 0.95rem;
  }

  .mail-count {
    min-width: 20px;
    height: 20px;
    font-size: 0.72rem;
  }

  .mail-item {
    padding: var(--spacing-sm);
  }

  .toggle-sm span {
    font-size: 0.72rem;
  }
}

/* ===== Light Mode ===== */
[data-theme="light"] {
  --bg-primary: #f4f6fb;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eef0f7;
  --bg-card: #ffffff;
  --bg-hover: #e8ecf5;

  --neon-cyan: #0077cc;
  --neon-magenta: #cc0077;
  --neon-purple: #7733cc;
  --neon-blue: #0055bb;
  /* Use teal/blue instead of neon green to avoid unreadable green text */
  --neon-green: #0077aa;

  --text-primary: #111827;
  --text-secondary: #374151;
  --text-tertiary: #6b7280;
  --text-muted: #9ca3af;

  --border-color: #d1d5db;
  --border-glow: rgba(0, 119, 204, 0.2);

  --status-online: #0090a0;
  --status-busy: #cc5500;
  --status-offline: #9ca3af;
}

[data-theme="light"] body {
  background: var(--bg-primary);
  color: var(--text-primary);
}

[data-theme="light"] body::before {
  background-image:
    linear-gradient(rgba(0, 119, 204, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 119, 204, 0.04) 1px, transparent 1px);
}

[data-theme="light"] .navbar {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: rgba(0, 119, 204, 0.18);
  box-shadow: 0 1px 6px rgba(0,0,0,0.06);
}

[data-theme="light"] .nav-logo-wrap {
  background: linear-gradient(135deg, rgba(0,119,204,0.12) 0%, rgba(0,85,187,0.08) 100%);
  border-color: rgba(0,119,204,0.3);
}

[data-theme="light"] .nav-item:hover {
  background: rgba(0,119,204,0.07);
  border-color: rgba(0,119,204,0.25);
}

[data-theme="light"] .info-card {
  background: linear-gradient(135deg, rgba(0,119,204,0.05) 0%, rgba(0,85,187,0.02) 100%);
  border-color: rgba(0,119,204,0.2);
}

[data-theme="light"] .info-value-box {
  background: rgba(0,0,0,0.04);
  border-color: rgba(0,119,204,0.15);
}

[data-theme="light"] .info-label {
  color: #111827;
}

[data-theme="light"] .mail-card {
  border-color: #e5e7eb;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

[data-theme="light"] .mail-header-bar {
  background: #f8fafc;
  border-bottom-color: #e5e7eb;
}

[data-theme="light"] .mail-item:hover {
  background: #f0f4ff;
}

[data-theme="light"] .mail-item.unread::before {
  background: var(--neon-cyan);
  box-shadow: 0 0 6px rgba(0,119,204,0.4);
}

[data-theme="light"] .modal-content {
  background: #ffffff;
  border-color: #d1d5db;
  box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

[data-theme="light"] .modal-header {
  background: #f8fafc;
  border-bottom-color: #e5e7eb;
}

[data-theme="light"] .modal-footer {
  background: #f8fafc;
  border-top-color: #e5e7eb;
}

[data-theme="light"] .settings-item {
  background: rgba(0,0,0,0.02);
  border-color: #e5e7eb;
  color: #111827;
}

[data-theme="light"] .settings-item:hover {
  background: rgba(0,119,204,0.06);
  border-color: rgba(0,119,204,0.3);
}

[data-theme="light"] .spinner {
  border-color: rgba(0,119,204,0.15);
  border-top-color: var(--neon-cyan);
  box-shadow: none;
}

[data-theme="light"] .empty-state {
  color: var(--text-secondary);
}

[data-theme="light"] .icon-btn {
  background: rgba(0,0,0,0.04);
  border-color: #d1d5db;
  color: var(--text-secondary);
}

[data-theme="light"] .icon-btn:hover {
  background: rgba(0,119,204,0.1);
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}

[data-theme="light"] .btn-primary {
  background: linear-gradient(135deg, var(--neon-cyan) 0%, var(--neon-blue) 100%);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0,119,204,0.25);
}

[data-theme="light"] .btn-secondary {
  background: #f3f4f6;
  color: #374151;
  border-color: #d1d5db;
}

[data-theme="light"] .btn-secondary:hover {
  background: #e5e7eb;
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}

[data-theme="light"] .api-entry {
  background: #f8fafc;
  border-color: #e5e7eb;
}

[data-theme="light"] .password-save-box {
  background: rgba(0,0,0,0.03);
  border-color: rgba(0,119,204,0.2);
}

[data-theme="light"] .toast {
  background: #ffffff;
  border-color: #d1d5db;
  color: #111827;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

[data-theme="light"] .input-wrapper {
  background: #f9fafb;
  border-color: #d1d5db;
}

[data-theme="light"] .mail-from {
  color: var(--neon-purple);
}

[data-theme="light"] .nav-title {
  background: linear-gradient(135deg, #111827 0%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* Light mode: pw-strength strong = blue instead of green */
[data-theme="light"] .pw-strength-fill.strong {
  background: var(--neon-cyan);
}
[data-theme="light"] .pw-strength-label.strong {
  color: var(--neon-cyan);
}
/* Light mode: pw match = blue */
[data-theme="light"] .pw-match-msg.match {
  color: var(--neon-cyan);
}
/* Light mode: toast success border = blue/teal */
[data-theme="light"] .toast.success {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0,119,204,0.18);
}
/* Light mode: toggle switches = blue instead of green */
[data-theme="light"] .toggle input:checked + .toggle-slider {
  background: rgba(0,119,204,0.18);
  border-color: var(--neon-cyan);
}
[data-theme="light"] .toggle input:checked + .toggle-slider::before {
  background: var(--neon-cyan);
  box-shadow: 0 0 8px rgba(0,119,204,0.4);
}
[data-theme="light"] .toggle-sm input:checked + .toggle-slider-sm {
  background: rgba(0,119,204,0.18);
  border-color: var(--neon-cyan);
}
[data-theme="light"] .toggle-sm input:checked + .toggle-slider-sm::before {
  background: var(--neon-cyan);
  box-shadow: 0 0 6px rgba(0,119,204,0.35);
}
/* Light mode: API GET method badge = teal not green */
[data-theme="light"] .api-method.get {
  background: var(--neon-cyan);
  color: #fff;
}
/* Light mode: drawer */
[data-theme="light"] .drawer {
  background: #ffffff;
  border-left-color: #d1d5db;
  box-shadow: -8px 0 40px rgba(0,0,0,0.12);
}
[data-theme="light"] .drawer-header {
  background: #f8fafc;
  border-bottom-color: #e5e7eb;
}
[data-theme="light"] .drawer-title {
  background: linear-gradient(135deg, #111827 0%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
[data-theme="light"] .drawer-close {
  color: #6b7280;
}
[data-theme="light"] .drawer-close:hover {
  background: #f0f4ff;
  color: var(--neon-magenta);
}
[data-theme="light"] .drawer-section-label {
  color: rgba(55,65,81,0.5);
}
[data-theme="light"] .drawer-item {
  color: #111827;
}
[data-theme="light"] .drawer-item:hover {
  background: rgba(0,119,204,0.07);
  border-color: rgba(0,119,204,0.2);
  color: #0055bb;
}
[data-theme="light"] .drawer-item svg {
  color: var(--neon-cyan);
}
[data-theme="light"] .drawer-item-danger {
  color: #cc0044;
}
[data-theme="light"] .drawer-item-danger:hover {
  background: rgba(204,0,68,0.07);
  border-color: rgba(204,0,68,0.25);
  color: var(--neon-magenta);
}
[data-theme="light"] .drawer-item-danger svg {
  color: var(--neon-magenta);
}
[data-theme="light"] .drawer-divider {
  background: #e5e7eb;
}
[data-theme="light"] .drawer-overlay {
  background: rgba(0,0,0,0.3);
}
/* Light mode: hamburger button */
[data-theme="light"] .hamburger-btn {
  background: rgba(0,0,0,0.04);
  border-color: #d1d5db;
}
[data-theme="light"] .hamburger-btn:hover {
  background: rgba(0,119,204,0.1);
  border-color: rgba(0,119,204,0.3);
}
[data-theme="light"] .hamburger-btn span {
  background: #374151;
}
[data-theme="light"] .hamburger-btn:hover span {
  background: var(--neon-cyan);
}

/* ===== Global Stats Meter ===== */
.global-stats-meter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 14px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.08) 0%, rgba(184, 41, 221, 0.05) 100%);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.08), inset 0 1px 0 rgba(255,255,255,0.05);
  transition: all var(--transition-fast);
  position: static;
  margin: 0 auto 1rem auto;
  width: fit-content;
  max-width: 100%;
}

.global-stats-meter:hover {
  border-color: rgba(0, 240, 255, 0.35);
  box-shadow: 0 6px 25px rgba(0, 240, 255, 0.12), inset 0 1px 0 rgba(255,255,255,0.08);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stat-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-sm);
  color: var(--neon-cyan);
}

.stat-icon svg {
  width: 14px;
  height: 14px;
}

.stat-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--neon-cyan);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
  line-height: 1;
}

.stat-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  line-height: 1;
}

.stat-divider {
  width: 1px;
  height: 24px;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 240, 255, 0.3) 50%, transparent 100%);
  margin: 0 4px;
}

/* Animations for stats */
@keyframes statPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.stat-value.updating {
  animation: statPulse 0.5s ease;
}

/* Responsive adjustments for stats meter */
@media (max-width: 768px) {
  .global-stats-meter {
    padding: 5px 10px;
    gap: 6px;
    margin-bottom: 0.75rem;
  }

  .stat-icon {
    width: 24px;
    height: 24px;
  }

  .stat-icon svg {
    width: 12px;
    height: 12px;
  }

  .stat-value {
    font-size: 0.875rem;
  }

  .stat-label {
    font-size: 0.6rem;
    letter-spacing: 0.05em;
    max-width: 70px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .stat-divider {
    height: 20px;
    margin: 0 2px;
  }

  .stat-content {
    gap: 2px;
  }
}

@media (max-width: 480px) {
  .global-stats-meter {
    padding: 4px 8px;
    gap: 4px;
    margin-bottom: 0.5rem;
    width: 100%;
    max-width: 320px;
  }

  .stat-icon {
    width: 20px;
    height: 20px;
  }

  .stat-icon svg {
    width: 10px;
    height: 10px;
  }

  .stat-value {
    font-size: 0.75rem;
  }

  .stat-label {
    font-size: 0.5rem;
    letter-spacing: 0.03em;
    max-width: 55px;
  }

  .stat-item {
    gap: 4px;
  }

  .stat-divider {
    height: 18px;
    margin: 0 2px;
  }
}

/* Light Mode: Global Stats Meter */
[data-theme="light"] .global-stats-meter {
  background: linear-gradient(135deg, rgba(0, 119, 204, 0.06) 0%, rgba(119, 51, 204, 0.03) 100%);
  border-color: rgba(0, 119, 204, 0.2);
  box-shadow: 0 2px 12px rgba(0, 119, 204, 0.06), inset 0 1px 0 rgba(255,255,255,0.5);
}

[data-theme="light"] .global-stats-meter:hover {
  border-color: rgba(0, 119, 204, 0.35);
  box-shadow: 0 4px 16px rgba(0, 119, 204, 0.1), inset 0 1px 0 rgba(255,255,255,0.6);
}

[data-theme="light"] .stat-icon {
  background: rgba(0, 119, 204, 0.1);
  border-color: rgba(0, 119, 204, 0.2);
  color: var(--neon-cyan);
}

[data-theme="light"] .stat-value {
  color: var(--neon-cyan);
  text-shadow: none;
}

[data-theme="light"] .stat-label {
  color: #6b7280;
}

[data-theme="light"] .stat-divider {
  background: linear-gradient(180deg, transparent 0%, rgba(0, 119, 204, 0.2) 50%, transparent 100%);
}
/* Light mode: lang buttons */
[data-theme="light"] .lang-btn {
  color: #374151;
  border-color: #d1d5db;
  background: transparent;
}
[data-theme="light"] .lang-btn:hover {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
}
[data-theme="light"] .lang-btn.active {
  background: rgba(0,119,204,0.1);
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
}
/* Light mode: form inputs */
[data-theme="light"] .form-input {
  background: #ffffff;
  border-color: #d1d5db;
  color: #111827;
}
[data-theme="light"] .form-input:focus {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(0,119,204,0.1);
}
[data-theme="light"] .form-label {
  color: #374151;
}
/* Light mode: address hint dot (was green, now teal) */
[data-theme="light"] .address-hint::before {
  background: var(--neon-cyan);
  box-shadow: 0 0 6px rgba(0,119,204,0.4);
}
/* Light mode: mail count badge */
[data-theme="light"] .mail-count {
  background: rgba(0,119,204,0.1);
  color: var(--neon-cyan);
}
[data-theme="light"] .mail-count.has-unread {
  background: rgba(204,0,119,0.12);
  color: var(--neon-magenta);
}
/* Light mode: modal close button */
[data-theme="light"] .modal-close {
  color: #6b7280;
}
[data-theme="light"] .modal-close:hover {
  color: var(--neon-magenta);
  background: rgba(204,0,119,0.07);
}
/* Light mode: confirm icons */
[data-theme="light"] .confirm-icon.warning {
  background: rgba(204,85,0,0.08);
  border-color: rgba(204,85,0,0.2);
  color: #cc5500;
}
[data-theme="light"] .confirm-icon.info {
  background: rgba(0,119,204,0.08);
  border-color: rgba(0,119,204,0.2);
  color: var(--neon-cyan);
}

[data-theme="light"] .drawer-footer {
  border-top-color: #e5e7eb;
}
[data-theme="light"] .drawer-register-btn {
  background: rgba(0,119,204,0.07);
  border-color: rgba(0,119,204,0.25);
  color: var(--neon-cyan);
}

/* ===== Drawer Footer - Legal Links ===== */
.drawer-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  margin-top: auto;
}

.drawer-footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.drawer-footer-link {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.drawer-footer-link:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

.drawer-footer-separator {
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

.drawer-footer-copy {
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-align: center;
  margin: 0;
}

/* ===== Saved Mail Badge & Auth Code Styles ===== */
.mail-saved-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  margin-right: 6px;
  color: var(--neon-green);
  vertical-align: middle;
}

.mail-saved-badge svg {
  fill: currentColor;
}

.mail-item.saved {
  border-left: 3px solid var(--neon-green);
}

.mail-auth-code {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.25rem 0;
  padding: 0.25rem 0.5rem;
  background: rgba(0, 255, 157, 0.1);
  border: 1px solid rgba(0, 255, 157, 0.3);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.auth-code-label {
  color: var(--neon-green);
  font-weight: 600;
  font-size: 0.75rem;
}

.auth-code-value {
  background: var(--bg-tertiary);
  color: var(--neon-green);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

.mail-not-saved-warning {
  font-size: 0.75rem;
  color: var(--status-busy);
  margin-top: 0.25rem;
  opacity: 0.8;
}

/* ===== Auth Code Banner in Modal ===== */
.mail-auth-code-banner {
  background: linear-gradient(135deg, rgba(0, 255, 157, 0.15), rgba(0, 240, 255, 0.1));
  border: 2px solid var(--neon-green);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin: 0 0 1rem 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.auth-code-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--neon-green);
}

.auth-code-icon {
  font-size: 1.25rem;
}

.auth-code-value-large {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.2em;
  background: var(--bg-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

/* VERIFY リンクバナー（簡易版） */
.mail-verify-banner {
  background: linear-gradient(135deg, rgba(255, 43, 214, 0.15), rgba(255, 0, 128, 0.08));
  border: 1px solid var(--neon-magenta, #ff2bd6);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.verify-banner-icon {
  color: var(--neon-magenta, #ff2bd6);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255, 43, 214, 0.15);
  flex-shrink: 0;
}
.verify-banner-body {
  flex: 1; min-width: 0;
}
.verify-banner-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--neon-magenta, #ff2bd6);
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}
.verify-banner-url {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.verify-banner-btn {
  flex-shrink: 0;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--neon-magenta, #ff2bd6);
  background: rgba(255, 43, 214, 0.12);
  color: var(--neon-magenta, #ff2bd6);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  transition: background 0.15s ease;
}
.verify-banner-btn:hover {
  background: rgba(255, 43, 214, 0.28);
}

.mail-not-saved-banner {
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.3);
  color: var(--status-busy);
  padding: 0.75rem;
  margin: 0 0 1rem 0;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.warning-icon {
  flex-shrink: 0;
  vertical-align: middle;
}

.auth-code-icon {
  flex-shrink: 0;
  vertical-align: middle;
  color: var(--neon-green);
}

.auth-code-hint {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

.mail-auth-code-copyable {
  cursor: pointer;
  transition: all 0.2s;
}

.mail-auth-code-copyable:hover {
  background: rgba(0, 255, 157, 0.15);
  border-color: rgba(0, 255, 157, 0.3);
}

.auth-code-copy-hint {
  font-size: 0.7rem;
  color: var(--text-secondary);
  opacity: 0.7;
  margin-left: auto;
}

/* ===== Save Button Styles ===== */
#modal-save-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

#modal-save-btn.saved {
  background: rgba(0, 255, 157, 0.15);
  color: var(--neon-green);
  border-color: var(--neon-green);
}

#modal-save-btn.saved:hover {
  background: rgba(255, 0, 170, 0.15);
  color: var(--neon-magenta);
  border-color: var(--neon-magenta);
}

/* ===== Small Button Variant ===== */
.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
}