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

:root {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --bg-hover: #1a1a1a;
  --border: #222;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-dim: rgba(59, 130, 246, 0.1);
  --text: #e5e5e5;
  --text-muted: #888;
  --text-link: #60a5fa;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg: #f0f2f5;
  --bg-card: #ffffff;
  --bg-hover: #f7f8fa;
  --border: #e0e0e0;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-dim: rgba(37, 99, 235, 0.08);
  --text: #1a1a1a;
  --text-muted: #666;
  --text-link: #2563eb;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ─── Fade-in Animation ─── */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes iconSpin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ─── Theme Toggle ─── */
.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  width: 56px;
  height: 30px;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  padding: 3px;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
  animation: fadeSlideDown 0.5s ease both;
  animation-delay: 0.2s;
}

.theme-toggle:hover {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-dim);
}

.theme-toggle-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: transform var(--transition), background var(--transition);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

[data-theme="light"] .theme-toggle-thumb {
  transform: translateX(26px);
}

.theme-toggle-icon {
  transition: opacity 0.2s, transform 0.3s;
  line-height: 1;
}

.theme-toggle-icon.dark-icon,
.theme-toggle-icon.light-icon {
  position: absolute;
}

.theme-toggle-icon.dark-icon {
  opacity: 1;
  transform: scale(1);
}

.theme-toggle-icon.light-icon {
  opacity: 0;
  transform: scale(0.5) rotate(-90deg);
}

[data-theme="light"] .theme-toggle-icon.dark-icon {
  opacity: 0;
  transform: scale(0.5) rotate(90deg);
}

[data-theme="light"] .theme-toggle-icon.light-icon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* ─── Container ─── */
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Header ─── */
header {
  text-align: center;
  margin-bottom: 2rem;
  animation: fadeSlideDown 0.6s ease both;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.logo-icon {
  font-size: 2rem;
  animation: scaleIn 0.5s ease both;
  animation-delay: 0.3s;
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition);
}

/* ─── Sections ─── */
.section {
  animation: fadeSlideUp 0.5s ease both;
  animation-delay: 0.15s;
}

.hidden {
  display: none !important;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255,255,255,0.15), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
}

.btn:active::after {
  opacity: 1;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
  padding: 1rem;
  font-size: 1.05rem;
  border-radius: var(--radius);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-dim);
}

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

.btn-small {
  background: var(--accent);
  color: #fff;
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-small:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  transition: all 0.2s ease;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
  transition: color 0.2s, transform 0.2s;
}

.btn-close:hover {
  color: var(--text);
  transform: rotate(90deg);
}

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

/* ─── Spinner ─── */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: iconSpin 0.6s linear infinite;
}

/* ─── Generate Card ─── */
.generate-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  animation: scaleIn 0.4s ease both;
  animation-delay: 0.2s;
}

.generate-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.generate-hint {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
  transition: color var(--transition);
}

/* ─── Email Bar ─── */
.email-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  transition: all var(--transition);
  animation: fadeSlideUp 0.4s ease both;
}

.email-display {
  flex: 1;
  min-width: 0;
}

.email-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
  transition: color var(--transition);
}

.email-value {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  word-break: break-all;
}

.email-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ─── Timer ─── */
.timer-bar {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: all var(--transition);
  animation: fadeSlideUp 0.4s ease both;
  animation-delay: 0.1s;
}

.timer-progress {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  background: var(--accent-dim);
  transition: width 1s linear, background 0.5s;
}

.timer-text {
  position: relative;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: "SF Mono", "Fira Code", monospace;
  color: var(--text-muted);
  transition: color var(--transition);
}

/* ─── Inbox ─── */
.inbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  animation: fadeSlideUp 0.4s ease both;
  animation-delay: 0.15s;
}

.inbox-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
}

.mail-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  transition: all var(--transition);
}

.inbox-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ─── Email Card ─── */
.email-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
  animation: slideInRight 0.35s ease both;
}

.email-card:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateX(4px);
  box-shadow: -4px 0 0 var(--accent);
}

.email-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
}

.email-card-from {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  transition: color var(--transition);
}

.email-card-time {
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.email-card-subject {
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  color: var(--text);
  transition: color var(--transition);
}

.email-card-snippet {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition);
}

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  animation: pulse 2s ease-in-out infinite;
}

.empty-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 1rem;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: color var(--transition);
}

.empty-hint {
  font-size: 0.8rem !important;
  margin-top: 0.25rem;
  color: var(--text-muted) !important;
}

/* ─── Modal ─── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 1.5rem;
  animation: scaleIn 0.3s ease;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  transition: background var(--transition), border-color var(--transition);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
}

.modal-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition), border-color var(--transition);
}

.modal-meta strong {
  color: var(--text);
}

.modal-body {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text);
}

.modal-body iframe {
  width: 100%;
  border: none;
  min-height: 200px;
  background: #fff;
  border-radius: var(--radius-sm);
}

/* ─── Toast ─── */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 300;
  pointer-events: none;
}

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

/* ─── Footer ─── */
footer {
  margin-top: auto;
  padding-top: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color var(--transition);
  animation: fadeSlideUp 0.5s ease both;
  animation-delay: 0.3s;
}

footer a {
  color: var(--text-link);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ─── Responsive ─── */
@media (max-width: 480px) {
  .container {
    padding: 1.25rem 1rem;
  }

  .email-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .email-actions {
    justify-content: center;
  }

  .btn-primary {
    padding: 0.85rem;
  }

  .modal-content {
    padding: 1.25rem;
    max-height: 90vh;
  }
}

/* ─── Restore Section ─── */
.restore-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-top: 1rem;
  text-align: center;
  transition: all var(--transition);
  animation: fadeSlideUp 0.4s ease both;
  animation-delay: 0.35s;
}

.restore-hint {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  transition: color var(--transition);
}

.restore-form {
  display: flex;
  gap: 0.5rem;
  max-width: 480px;
  margin: 0 auto;
}

.restore-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
  font-family: "SF Mono", "Fira Code", monospace;
  outline: none;
  transition: all var(--transition);
}

.restore-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

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

/* ─── History Chips ─── */
.history-list {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.history-label {
  width: 100%;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
  transition: color var(--transition);
}

.history-chip {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-family: "SF Mono", "Fira Code", monospace;
  cursor: pointer;
  transition: all 0.2s ease;
}

.history-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-1px);
}

@media (max-width: 480px) {
  .restore-card {
    padding: 1.25rem 1rem;
  }

  .restore-form {
    flex-direction: column;
  }

  .theme-toggle {
    top: 0.75rem;
    right: 0.75rem;
  }
}