/* ============================================================
   Discord Markdown 轉換器 — 版面樣式
   MIT License © 2026 Will 保哥
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --font-sans: "Noto Sans TC", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Microsoft JhengHei", "PingFang TC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Code", Menlo,
    Consolas, monospace;

  --accent: #5865f2;
  --accent-2: #7289da;
  --accent-soft: rgba(88, 101, 242, 0.14);
  --mint: #3ddc97;
  --danger: #ed4245;
  --warning: #f0b232;

  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 9px;

  --header-h: 64px;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f5fb;
  --bg-accent-1: rgba(88, 101, 242, 0.14);
  --bg-accent-2: rgba(61, 220, 151, 0.12);
  --surface: rgba(255, 255, 255, 0.82);
  --surface-solid: #ffffff;
  --surface-2: rgba(255, 255, 255, 0.6);
  --border: rgba(25, 27, 46, 0.1);
  --border-strong: rgba(25, 27, 46, 0.18);
  --text: #191b2e;
  --muted: #5d6382;
  --shadow: 0 12px 40px rgba(25, 27, 46, 0.1);
  --shadow-sm: 0 2px 10px rgba(25, 27, 46, 0.06);
  --code-bg: rgba(88, 101, 242, 0.07);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1021;
  --bg-accent-1: rgba(88, 101, 242, 0.22);
  --bg-accent-2: rgba(61, 220, 151, 0.1);
  --surface: rgba(255, 255, 255, 0.045);
  --surface-solid: #171a30;
  --surface-2: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e8eaf6;
  --muted: #9aa1c4;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
  --code-bg: rgba(114, 137, 218, 0.16);
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition), color var(--transition);
  position: relative;
  overflow-x: hidden;
}

/* 背景光暈裝飾 */
body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -1;
  width: 46vw;
  height: 46vw;
  min-width: 420px;
  min-height: 420px;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}
body::before { top: -12vw; right: -10vw; background: var(--bg-accent-1); }
body::after { bottom: -14vw; left: -12vw; background: var(--bg-accent-2); }

.container {
  width: min(1180px, 100% - 2.5rem);
  margin-inline: auto;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.08em 0.4em;
  white-space: nowrap;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -48px; left: 16px;
  z-index: 100;
  padding: 0.6em 1.2em;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top var(--transition);
}
.skip-link:focus { top: 12px; text-decoration: none; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-weight: 700;
}
.brand:hover { text-decoration: none; }
.brand-icon {
  width: 36px; height: 36px;
  border-radius: 9px;
  box-shadow: var(--shadow-sm);
}
.brand-name { font-size: 1.02rem; letter-spacing: 0.2px; }
.brand-name em {
  font-style: normal;
  background: linear-gradient(120deg, var(--accent), var(--mint));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.header-nav a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.45em 0.9em;
  border-radius: 999px;
  transition: color var(--transition), background-color var(--transition);
}
.header-nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  margin-left: 0.4rem;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
  transition: transform var(--transition), background-color var(--transition), border-color var(--transition);
}
.theme-toggle:hover { transform: rotate(18deg); border-color: var(--accent); }
.theme-toggle:active { transform: scale(0.92); }

html[data-theme="light"] .icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: none; }

/* ---------- Hero ---------- */
.hero { padding: 4.2rem 0 3.2rem; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  align-items: center;
  gap: 3rem;
}

.hero-kicker {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.32em 1em;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 999px;
}

.hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(2.1rem, 4.6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: 0.5px;
}

.gradient-text {
  background: linear-gradient(120deg, var(--accent) 10%, var(--mint) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  margin: 0 0 1.6rem;
  font-size: 1.06rem;
  color: var(--muted);
  max-width: 34em;
}

.hero-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0 0 2rem;
  padding: 0;
}
.hero-chips li {
  font-size: 0.86rem;
  font-weight: 500;
  padding: 0.42em 0.95em;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(6px);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; }

.hero-visual { position: relative; }
.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transform: rotate(1.5deg);
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 10% 6% auto auto;
  width: 55%; height: 55%;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent), transparent 70%);
  filter: blur(52px);
  opacity: 0.5;
  z-index: -1;
}
.hero-visual:hover img { transform: rotate(0deg) scale(1.015); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45em;
  padding: 0.72em 1.6em;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.2;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition),
    background-color var(--transition), border-color var(--transition), color var(--transition);
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 24px rgba(88, 101, 242, 0.4);
}
.btn-primary:hover { box-shadow: 0 10px 32px rgba(88, 101, 242, 0.55); transform: translateY(-2px); }

.btn-ghost {
  color: var(--text);
  background: var(--surface);
  border-color: var(--border-strong);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-small {
  padding: 0.42em 1em;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface-2);
  border-color: var(--border);
  border-radius: 999px;
}
.btn-small:hover { border-color: var(--accent); color: var(--accent); }

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 60%, transparent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Converter ---------- */
.converter { padding: 1.5rem 0 4rem; }

.section-head { margin: 0 0 1.8rem; }
.section-head h2 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 900;
}
.section-head p { margin: 0; color: var(--muted); }

.converter-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.2rem;
  align-items: stretch;
}

.panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
  padding: 0.9rem 1.15rem;
  border-bottom: 1px solid var(--border);
}
.panel-head h3 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.dot-in { background: var(--warning); box-shadow: 0 0 10px var(--warning); }
.dot-out { background: var(--mint); box-shadow: 0 0 10px var(--mint); }
.panel-tools { display: flex; gap: 0.45rem; }

.panel textarea {
  flex: 1;
  width: 100%;
  min-height: 440px;
  padding: 1.1rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text);
  background: transparent;
  border: none;
  resize: vertical;
  tab-size: 2;
}
.panel textarea:focus { outline: none; }
.panel textarea::placeholder { color: var(--muted); opacity: 0.75; }

#output {
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 26px,
    color-mix(in srgb, var(--accent) 4%, transparent) 26px,
    color-mix(in srgb, var(--accent) 4%, transparent) 52px
  );
}

.panel-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.55rem 1.15rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}

.char-count { font-variant-numeric: tabular-nums; }

.limit-badge {
  padding: 0.22em 0.8em;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.78rem;
  border: 1px solid transparent;
}
.limit-badge.warn {
  color: var(--warning);
  border-color: color-mix(in srgb, var(--warning) 55%, transparent);
  background: color-mix(in srgb, var(--warning) 12%, transparent);
}
.limit-badge.over {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 55%, transparent);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
}

/* 中間轉換按鈕 */
.convert-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-width: 96px;
}

.convert-btn {
  width: 72px; height: 72px;
  display: grid;
  place-items: center;
  border: none;
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 30px rgba(88, 101, 242, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  transition: transform var(--transition), box-shadow var(--transition);
}
.convert-btn:hover {
  transform: scale(1.08) rotate(-6deg);
  box-shadow: 0 14px 40px rgba(88, 101, 242, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
.convert-btn:active { transform: scale(0.95); }
.convert-btn:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 60%, transparent); outline-offset: 4px; }

.convert-hint {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.22em 0.8em;
  white-space: nowrap;
}

/* 選項與統計 */
.options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.2rem;
}

.option-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  cursor: pointer;
  user-select: none;
}
.option-toggle input { position: absolute; opacity: 0; }

.toggle-track {
  width: 46px; height: 26px;
  flex-shrink: 0;
  border-radius: 999px;
  background: var(--border-strong);
  position: relative;
  transition: background-color var(--transition);
}
.toggle-thumb {
  position: absolute;
  top: 3px; left: 3px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition);
}
.option-toggle input:checked + .toggle-track { background: var(--accent); }
.option-toggle input:checked + .toggle-track .toggle-thumb { transform: translateX(20px); }
.option-toggle input:focus-visible + .toggle-track {
  outline: 3px solid color-mix(in srgb, var(--accent) 60%, transparent);
  outline-offset: 2px;
}

.option-text { display: flex; flex-direction: column; line-height: 1.35; }
.option-text strong { font-size: 0.92rem; }
.option-text small { color: var(--muted); font-size: 0.78rem; }

.stats-bar { margin: 0; font-size: 0.85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.stats-bar:empty { display: none; }

.warning-bar {
  margin: 0.9rem 0 0;
  padding: 0.72em 1.1em;
  font-size: 0.88rem;
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--warning) 55%, transparent);
  background: color-mix(in srgb, var(--warning) 12%, transparent);
}
.warning-bar[hidden] { display: none; }

/* ---------- Rules ---------- */
.rules { padding: 3.2rem 0; }

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 1.1rem;
}

.rule-card {
  padding: 1.35rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.rule-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow: var(--shadow);
}
.rule-card-wide { grid-column: span 2; }

.rule-icon {
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  font-size: 1.35rem;
  margin-bottom: 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}

.rule-card h3 { margin: 0 0 0.45rem; font-size: 1.02rem; font-weight: 700; }
.rule-card p { margin: 0; font-size: 0.9rem; color: var(--muted); }

/* ---------- Support table ---------- */
.support { padding: 1rem 0 4.5rem; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  backdrop-filter: blur(8px);
}

.support table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  min-width: 640px;
}

.support th,
.support td {
  padding: 0.8rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.support thead th {
  font-size: 0.82rem;
  letter-spacing: 0.5px;
  color: var(--muted);
  text-transform: uppercase;
  background: var(--surface-2);
}
.support tbody tr:last-child td { border-bottom: none; }
.support tbody tr { transition: background-color var(--transition); }
.support tbody tr:hover { background: var(--surface-2); }

.support .ok { color: var(--mint); font-weight: 700; }
.support .no { color: var(--danger); font-weight: 700; }
.support .warn { color: var(--warning); font-weight: 700; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  background: var(--surface);
  backdrop-filter: blur(8px);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.footer-copy { margin: 0; font-weight: 600; }
.footer-copy a { color: var(--accent); }
.footer-note { margin: 0; font-size: 0.84rem; color: var(--muted); }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 26px; left: 50%;
  transform: translate(-50%, 20px);
  z-index: 100;
  padding: 0.75em 1.5em;
  font-weight: 600;
  font-size: 0.92rem;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
  box-shadow: 0 12px 34px rgba(88, 101, 242, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.2rem; }
  .hero-visual { max-width: 420px; margin-inline: auto; }

  .converter-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .convert-col {
    flex-direction: row;
    min-width: 0;
    min-height: 0;
    padding: 0.2rem 0;
  }
  .convert-btn { width: 60px; height: 60px; }
  .convert-btn svg { transform: rotate(90deg); }
  .rule-card-wide { grid-column: span 1; }
}

@media (max-width: 560px) {
  .container { width: min(1180px, 100% - 1.6rem); }
  .hero { padding-top: 2.8rem; }
  .header-nav a:not(.theme-toggle) { display: none; }
  .panel textarea { min-height: 300px; }
  .options-row { flex-direction: column; align-items: flex-start; }
  .footer-inner { flex-direction: column; text-align: center; }
}

/* 尊重減少動態效果偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}