*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0c0e14;
  --surface: #151821;
  --surface-hover: #1c2030;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --accent-hover: #60a5fa;
  --text: #e8eaf0;
  --text-muted: #8891a5;
  --text-dim: #555d72;
  --border: #252a3a;
  --chip-bg: #1a1f2e;
  --chip-border: #2a3048;
  --chip-checked-bg: var(--accent);
  --chip-checked-text: #fff;
  --success: #34d399;
  --error: #f87171;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --font: 'Noto Sans TC', sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 16px 64px;
  -webkit-font-smoothing: antialiased;
}

/* Subtle noise texture overlay */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ── Header ──────────────────────────────────────────── */

header {
  width: 100%;
  max-width: 640px;
  padding: 48px 0 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.1rem;
  background: var(--accent);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  letter-spacing: 0.05em;
  box-shadow: 0 0 20px var(--accent-glow), 0 2px 8px rgba(0,0,0,0.3);
}

.logo h1 {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text);
}

.tagline {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-top: 2px;
}

/* ── Main ────────────────────────────────────────────── */

main {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Auth Card ───────────────────────────────────────── */

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
}

.auth-content h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.auth-content p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 8px;
}

.bot-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  margin: 16px 0 8px;
  background: #2aabee;
  color: #fff;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.2s;
  box-shadow: 0 4px 16px rgba(42, 171, 238, 0.25);
}

.bot-link:hover {
  background: #40b9f5;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(42, 171, 238, 0.35);
}

.bot-link-icon {
  font-size: 1.2rem;
}

.auth-note {
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 16px 0 24px;
  font-size: 0.85rem !important;
  text-align: left;
}

.auth-note code {
  font-family: var(--mono);
  background: var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.82rem;
}

.tg-widget-wrap {
  display: flex;
  justify-content: center;
  min-height: 40px;
}

/* ── User Info ───────────────────────────────────────── */

#user-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4px;
}

.user-greeting {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.user-greeting .wave {
  font-size: 1.1rem;
}

#user-name {
  font-weight: 700;
  color: var(--text);
}

#logout-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.8rem;
  padding: 5px 12px;
  border-radius: 6px;
  transition: all 0.2s;
}

#logout-btn:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

/* ── Cards ───────────────────────────────────────────── */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: #333a50;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.card-header h2 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.badge {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  padding: 2px 8px;
  border-radius: 10px;
  min-width: 22px;
  text-align: center;
}

.badge-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.hint {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 20px;
}

/* ── Topics Grid ─────────────────────────────────────── */

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
}

.topic-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--chip-border);
  border-radius: var(--radius-sm);
  background: var(--chip-bg);
  cursor: pointer;
  font-size: 0.84rem;
  color: var(--text);
  transition: all 0.2s;
  user-select: none;
}

.topic-chip:hover:not(.disabled) {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.topic-chip input[type="checkbox"] { display: none; }

.topic-chip.checked {
  background: var(--accent);
  color: var(--chip-checked-text);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.topic-chip.disabled:not(.checked) {
  opacity: 0.3;
  cursor: not-allowed;
}

.topic-chip .checkmark {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 10px;
  transition: all 0.15s;
}

.topic-chip.checked .checkmark {
  border-color: rgba(255,255,255,0.6);
}

.topic-chip.checked .checkmark::after { content: "\2713"; }

.topic-label {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.topic-label .zh {
  font-size: 0.82rem;
  font-weight: 500;
}

.topic-label .en {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-family: var(--mono);
  letter-spacing: 0.02em;
}

.topic-chip.checked .topic-label .en {
  color: rgba(255,255,255,0.65);
}

/* ── Time Grid ───────────────────────────────────────── */

.time-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
}

.time-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 8px;
  border: 1px solid var(--chip-border);
  border-radius: var(--radius-sm);
  background: var(--chip-bg);
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.time-chip:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.time-chip input[type="radio"] { display: none; }

.time-chip.selected {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.time-tw {
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--mono);
  color: var(--text);
}

.time-utc {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-family: var(--mono);
}

.time-chip.selected .time-tw { color: #fff; }
.time-chip.selected .time-utc { color: rgba(255,255,255,0.6); }

/* ── Options Row (lang) ──────────────────────────────── */

.options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.option-chip {
  padding: 10px 20px;
  border: 1px solid var(--chip-border);
  border-radius: var(--radius-sm);
  background: var(--chip-bg);
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--text);
  transition: all 0.2s;
  user-select: none;
}

.option-chip:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.option-chip input[type="radio"] { display: none; }

.option-chip.selected {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* ── Style Cards ─────────────────────────────────────── */

.style-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}

.style-card {
  padding: 16px;
  border: 1px solid var(--chip-border);
  border-radius: var(--radius-sm);
  background: var(--chip-bg);
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.style-card:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.style-card input[type="radio"] { display: none; }

.style-card.selected {
  background: var(--accent-glow);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.style-card .style-name {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.style-card .style-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.style-card.selected .style-name { color: var(--accent-hover); }

/* ── Save Button ─────────────────────────────────────── */

#save-btn {
  width: 100%;
  padding: 16px;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 16px var(--accent-glow);
}

#save-btn:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 4px 24px rgba(59, 130, 246, 0.25);
  transform: translateY(-1px);
}

#save-btn:active:not(:disabled) {
  transform: translateY(0);
}

#save-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#status-msg {
  text-align: center;
  font-size: 0.85rem;
  min-height: 24px;
  padding-top: 8px;
  color: var(--text-muted);
  transition: color 0.2s;
}

#status-msg.success { color: var(--success); }
#status-msg.error   { color: var(--error); }

/* ── Footer ──────────────────────────────────────────── */

footer {
  margin-top: 48px;
  text-align: center;
}

footer p {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.hidden { display: none !important; }

/* ── Animations ──────────────────────────────────────── */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card, .auth-card, #user-info, #save-btn {
  animation: fadeUp 0.4s ease both;
}

.card:nth-child(2) { animation-delay: 0.05s; }
.card:nth-child(3) { animation-delay: 0.10s; }
.card:nth-child(4) { animation-delay: 0.15s; }
.card:nth-child(5) { animation-delay: 0.20s; }

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 480px) {
  header { padding: 32px 0 24px; }
  .card { padding: 20px; }
  .auth-card { padding: 28px 20px; }
  .topics-grid { grid-template-columns: repeat(2, 1fr); }
  .time-grid { grid-template-columns: repeat(2, 1fr); }
  .style-cards { grid-template-columns: 1fr; }
}