/* ==========================================================================
   璇 (Xuan) — 介紹網站 v2
   設計語言：編輯感襯線字、玻璃浮層、柔和漸層與大留白。
   僅沿用 DESIGN.md 的「配色」，不套用其描邊／硬邊陰影／圓體字規範。
   ========================================================================== */

:root {
  /* 品牌色（沿用 DESIGN.md colors） */
  --day-cream: #FFE8C2;
  --day-gold: #F2B25A;
  --night-lavender: #B9AEE8;
  --night-indigo: #5C5A99;
  --outline-ink: #2A2438;
  --accent-star: #F7D9A0;
  --accent-mint: #9FE3C4;
  --accent-coral: #F4907E;
  --accent-sky: #8FB8E0;
  --accent-maple: #E8935C;
  --accent-energy: #FFBC6B;
  --accent-memory: #9BB1D1;

  /* 表面 */
  --surface-base: #FFF7EC;
  --surface-subtle: #F7EFE0;
  --surface-elevated: #FFFFFF;
  --surface-dusk: #EDEAF7;

  /* 文字 */
  --text-primary: #2A2438;
  --text-secondary: #6B6482;
  --text-muted: #A09BB0;
  --text-inverse: #FFFFFF;

  /* 由配色衍生的中性層 */
  --line: rgba(42, 36, 56, 0.10);
  --line-strong: rgba(42, 36, 56, 0.18);
  --line-inverse: rgba(255, 255, 255, 0.16);
  --ink-veil: rgba(42, 36, 56, 0.04);
  --glass: rgba(255, 247, 236, 0.78);
  --glass-strong: rgba(255, 247, 236, 0.94);
  --glass-dark: rgba(255, 255, 255, 0.06);
  --hero-text: #FFF7EC;
  --hero-text-soft: rgba(255, 247, 236, 0.70);
  --hero-text-faint: rgba(255, 247, 236, 0.60);

  /* 陰影：柔和多層，非硬邊 */
  --shadow-xs: 0 1px 2px rgba(42, 36, 56, 0.05);
  --shadow-sm: 0 2px 6px rgba(42, 36, 56, 0.05), 0 10px 24px -18px rgba(42, 36, 56, 0.30);
  --shadow-md: 0 4px 10px rgba(42, 36, 56, 0.05), 0 20px 44px -24px rgba(42, 36, 56, 0.35);
  --shadow-lg: 0 8px 18px rgba(42, 36, 56, 0.06), 0 48px 90px -46px rgba(42, 36, 56, 0.55);

  /* 圓角 */
  --r-xs: 8px;
  --r-sm: 12px;
  --r-md: 20px;
  --r-lg: 28px;
  --r-xl: 36px;
  --r-full: 999px;

  /* 字體 */
  --font-serif: 'Noto Serif TC', 'Songti TC', 'PMingLiU', 'Microsoft JhengHei', serif;
  --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft JhengHei', sans-serif;
  --font-latin: 'Fraunces', 'Noto Serif TC', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* 漸層 */
  --grad-warm: linear-gradient(135deg, var(--day-gold) 0%, var(--accent-star) 45%, var(--night-lavender) 100%);
  --grad-text: linear-gradient(180deg, #FFF7EC 0%, var(--day-cream) 52%, var(--night-lavender) 100%);
  --grad-night: radial-gradient(120% 130% at 82% -10%, var(--night-indigo) 0%, #3A3357 38%, var(--outline-ink) 78%);
  --grad-soft: radial-gradient(90% 70% at 15% 0%, var(--surface-dusk) 0%, var(--surface-base) 55%, var(--surface-base) 100%);

  /* 節奏 */
  --shell: 1200px;
  --gutter: clamp(20px, 5vw, 48px);
  --section-y: clamp(64px, 9vw, 120px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* --------------------------------------------------------------------------
   基礎
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 108px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--surface-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--text-primary);
}

p { margin: 0; }
img { max-width: 100%; display: block; }

a {
  color: var(--night-indigo);
  text-decoration: none;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

a:hover { text-decoration: underline; }

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background-color: var(--ink-veil);
  border-radius: 6px;
  padding: 2px 7px;
  color: var(--outline-ink);
}

::selection {
  background-color: var(--night-lavender);
  color: var(--outline-ink);
}

:focus-visible {
  outline: 2px solid var(--day-gold);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

.wrap {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 200;
  background-color: var(--surface-elevated);
  border-radius: var(--r-full);
  padding: 10px 20px;
  font-size: 14px;
  box-shadow: var(--shadow-md);
  transition: top 200ms var(--ease);
}

.skip-link:focus { top: 16px; }

/* --------------------------------------------------------------------------
   導覽：浮動玻璃藥丸
   -------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 14px 0;
  pointer-events: none;
}

.site-header .wrap { pointer-events: auto; }

.nav {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px 8px 16px;
  border-radius: var(--r-full);
  border: 1px solid rgba(255, 247, 236, 0.45);
  background: rgba(255, 247, 236, 0.90);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  backdrop-filter: blur(22px) saturate(180%);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text-primary);
}

.brand:hover { text-decoration: none; }

.brand__mark {
  width: 34px;
  height: 34px;
  border-radius: var(--r-full);
  box-shadow: 0 0 0 1px var(--line-strong);
  object-fit: cover;
}

.brand__text {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1;
}

.brand__latin {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.nav__links a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--r-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 200ms var(--ease), background-color 200ms var(--ease);
}

.nav__links a:hover {
  color: var(--text-primary);
  background-color: var(--ink-veil);
  text-decoration: none;
}

.nav__links a.is-active {
  color: var(--outline-ink);
  background-color: var(--surface-dusk);
}

.nav__cta { flex-shrink: 0; }

.nav__toggle {
  display: none;
  margin-left: auto;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-full);
  background-color: var(--surface-elevated);
  cursor: pointer;
}

.nav__toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  border-radius: var(--r-full);
  background-color: var(--outline-ink);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   按鈕與標籤
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: var(--r-full);
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
  cursor: pointer;
  transition: transform 240ms var(--ease), box-shadow 240ms var(--ease),
              background-color 240ms var(--ease), color 240ms var(--ease);
}

.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background-image: var(--grad-warm);
  color: var(--outline-ink);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  color: var(--outline-ink);
  box-shadow: var(--shadow-md), 0 0 40px rgba(242, 178, 90, 0.35);
}

.btn--secondary {
  background-color: var(--surface-elevated);
  border-color: var(--line);
  color: var(--text-primary);
  box-shadow: var(--shadow-xs);
}

.btn--secondary:hover {
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.btn--ghost {
  background-color: rgba(255, 255, 255, 0.06);
  border-color: var(--line-inverse);
  color: var(--hero-text);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.btn--ghost:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: var(--hero-text);
}

.btn--sm { padding: 10px 18px; font-size: 13px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-full);
  background-color: var(--surface-elevated);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.5;
  white-space: nowrap;
}

.badge--gold { background-color: rgba(242, 178, 90, 0.16); border-color: rgba(242, 178, 90, 0.35); color: #8A5A16; }
.badge--dusk { background-color: var(--surface-dusk); border-color: transparent; color: var(--night-indigo); }
.badge--mint { background-color: rgba(159, 227, 196, 0.28); border-color: transparent; color: #22684C; }
.badge--sky { background-color: rgba(143, 184, 224, 0.24); border-color: transparent; color: #2C5C86; }

.badge__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--r-full);
  background-color: #2E8B62;
  box-shadow: 0 0 0 3px rgba(159, 227, 196, 0.45);
}

/* --------------------------------------------------------------------------
   Hero：夜幕
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(120px, 16vw, 176px) 0 0;
  background-image: var(--grad-night);
  color: var(--hero-text);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(1px 1px at 12% 22%, rgba(255, 247, 236, 0.55) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 68% 12%, rgba(255, 247, 236, 0.45) 50%, transparent 51%),
    radial-gradient(1px 1px at 88% 62%, rgba(255, 247, 236, 0.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 32% 74%, rgba(255, 247, 236, 0.30) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 52% 44%, rgba(255, 247, 236, 0.25) 50%, transparent 51%);
  opacity: 0.8;
}

.hero__glow {
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  pointer-events: none;
}

.hero__glow--gold {
  width: 420px;
  height: 420px;
  top: -80px;
  right: 22%;
  background-color: var(--day-gold);
}

.hero__glow--lav {
  width: 520px;
  height: 520px;
  bottom: -160px;
  left: -120px;
  background-color: var(--night-lavender);
  opacity: 0.35;
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  align-items: center;
  gap: clamp(32px, 6vw, 72px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--hero-text-faint);
  margin-bottom: 26px;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background-color: currentColor;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(88px, 13vw, 168px);
  font-weight: 600;
  line-height: 0.86;
  letter-spacing: 0.02em;
  /* line-height 0.86 會讓字墨低於元素盒子約 0.09em；
     background-clip: text 只在盒子內上色，底部會被切平。
     補 padding 撐開上色範圍，讓「璇」的下緣完整。 */
  padding-bottom: 0.11em;
  margin: 0 0 6px -6px;
  background-image: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__latin {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.52em;
  text-transform: uppercase;
  color: var(--night-lavender);
  margin-bottom: 28px;
}

.hero__lead {
  max-width: 34ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.95;
  color: var(--hero-text-soft);
  margin-bottom: 34px;
}

.hero__lead strong {
  color: var(--hero-text);
  font-weight: 600;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.hero__note {
  font-size: 12.5px;
  color: var(--hero-text-faint);
  letter-spacing: 0.02em;
}

.hero__visual {
  position: relative;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
}

.hero__halo {
  position: absolute;
  width: 84%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background-image: conic-gradient(from 140deg, var(--day-gold), var(--night-lavender), var(--night-indigo), var(--day-gold));
  filter: blur(46px);
  opacity: 0.34;
}

.hero__avatar {
  position: relative;
  width: 72%;
  height: auto;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.22), var(--shadow-lg);
}

.hero__orbit {
  position: absolute;
  width: 88%;
  aspect-ratio: 1 / 1;
  border: 1px dashed rgba(255, 247, 236, 0.22);
  border-radius: 50%;
  animation: spin 60s linear infinite;
}

.hero__orbit::before,
.hero__orbit::after {
  content: "";
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--day-cream);
  box-shadow: 0 0 14px rgba(255, 232, 194, 0.9);
}

.hero__orbit::before { top: -4px; left: 50%; }
.hero__orbit::after { bottom: 12%; right: 8%; background-color: var(--night-lavender); }

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

.hero__tag {
  position: absolute;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 16px;
  border-radius: var(--r-full);
  border: 1px solid var(--line-inverse);
  background: rgba(255, 255, 255, 0.10);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  font-size: 12px;
  color: var(--hero-text-soft);
  white-space: nowrap;
  box-shadow: 0 10px 30px -18px rgba(0, 0, 0, 0.6);
}

.hero__tag b {
  font-family: var(--font-latin);
  font-size: 17px;
  font-weight: 600;
  color: var(--hero-text);
  letter-spacing: 0.02em;
}

.hero__tag--1 { top: 7%; left: 0; }
.hero__tag--2 { top: 45%; right: -3%; }
.hero__tag--3 { bottom: 6%; left: 9%; }

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--line-inverse);
}

.hero__stats div {
  padding: 26px 0 34px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.hero__stats div + div {
  padding-left: 28px;
  border-left: 1px solid var(--line-inverse);
}

.hero__stats b {
  font-family: var(--font-latin);
  font-size: 30px;
  font-weight: 500;
  color: var(--hero-text);
  letter-spacing: 0.02em;
}

.hero__stats span {
  font-size: 12.5px;
  color: var(--hero-text-faint);
  letter-spacing: 0.06em;
}

/* --------------------------------------------------------------------------
   跑馬燈
   -------------------------------------------------------------------------- */

.marquee {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background-color: var(--surface-subtle);
  padding: 14px 0;
}

.marquee__track {
  display: flex;
  width: max-content;
  gap: 40px;
  animation: marquee 42s linear infinite;
}

.marquee span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}

.marquee span::after {
  content: "✳";
  margin-left: 40px;
  color: var(--day-gold);
}

@keyframes marquee {
  to { transform: translateX(-50%); }
}

/* --------------------------------------------------------------------------
   區塊
   -------------------------------------------------------------------------- */

.section {
  padding: var(--section-y) 0;
  position: relative;
}

.section--tint { background-color: var(--surface-subtle); }
.section--dusk { background-image: var(--grad-soft); }

.section--dark {
  background-image: var(--grad-night);
  color: var(--hero-text);
}

.section__head {
  max-width: 660px;
  margin-bottom: clamp(36px, 5vw, 60px);
}

.section__head .eyebrow { color: var(--text-muted); }

.section__title {
  font-size: clamp(28px, 3.8vw, 42px);
  font-weight: 600;
  margin-bottom: 16px;
}

.section__desc {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.section--dark .section__title { color: var(--hero-text); }
.section--dark .section__desc { color: var(--hero-text-soft); }
.section--dark .section__head .eyebrow { color: var(--hero-text-faint); }

.section__head--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  align-items: end;
  gap: 32px;
  max-width: none;
}

.section__head--split .section__desc {
  padding-bottom: 6px;
  max-width: 40ch;
  justify-self: end;
}

/* --------------------------------------------------------------------------
   關於
   -------------------------------------------------------------------------- */

.about {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}

.about__body p {
  font-size: 16.5px;
  line-height: 2;
  color: var(--text-secondary);
}

.about__body p + p { margin-top: 20px; }

.about__body strong { color: var(--text-primary); font-weight: 600; }

.about__quote {
  position: sticky;
  top: 120px;
  margin: 0;
  padding: 38px 34px 30px;
  border-radius: var(--r-lg);
  background-color: var(--surface-elevated);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}

.about__quote::before {
  content: "“";
  display: block;
  font-family: var(--font-latin);
  font-size: 74px;
  line-height: 0.6;
  color: var(--day-gold);
  margin-bottom: 14px;
}

.about__quote p {
  font-family: var(--font-serif);
  font-size: 23px;
  line-height: 1.75;
  color: var(--text-primary);
}

.about__quote footer {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.traits {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.traits li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.traits li:last-child { border-bottom: 1px solid var(--line); }

.traits svg {
  width: 18px;
  height: 18px;
  margin-top: 4px;
  color: var(--night-indigo);
}

.traits strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--text-primary);
  margin-bottom: 2px;
}

/* --------------------------------------------------------------------------
   時間軸步驟
   -------------------------------------------------------------------------- */

.timeline {
  list-style: none;
  margin: 0 0 clamp(40px, 6vw, 72px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 38px;
  height: 1px;
  background-image: linear-gradient(90deg, var(--day-gold), var(--night-lavender), transparent);
  opacity: 0.6;
}

.step { position: relative; padding-top: 72px; }

.step::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background-color: var(--surface-base);
  border: 1px solid var(--line-strong);
  box-shadow: 0 0 0 5px var(--surface-subtle);
}

.step__num {
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-latin);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--text-muted);
}

.step h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.step p {
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.step code { font-size: 13px; }

/* --------------------------------------------------------------------------
   對話示意（深色）
   -------------------------------------------------------------------------- */

.chat {
  max-width: 760px;
  margin: 0 auto;
  border-radius: var(--r-lg);
  background-image: linear-gradient(180deg, #332C4B 0%, var(--outline-ink) 100%);
  border: 1px solid rgba(255, 255, 255, 0.10);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  color: var(--hero-text);
}

.chat__bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  color: var(--hero-text-faint);
  letter-spacing: 0.04em;
}

.chat__bar i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--accent-coral);
  display: block;
}

.chat__bar i:nth-child(2) { background-color: var(--day-gold); }
.chat__bar i:nth-child(3) { background-color: var(--accent-mint); }

.chat__bar span:first-of-type { color: var(--hero-text-soft); }

.chat__tag {
  margin-left: auto;
  padding: 3px 10px;
  border-radius: var(--r-full);
  background-color: rgba(255, 255, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.chat__body {
  padding: clamp(20px, 3vw, 30px);
  display: grid;
  gap: 22px;
}

.msg {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.msg__avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--hero-text);
  background-color: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.msg__avatar img { width: 100%; height: 100%; object-fit: cover; }

.msg__name {
  font-size: 12px;
  font-weight: 600;
  color: var(--hero-text-soft);
  margin-bottom: 4px;
}

.msg__name small {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--hero-text-faint);
  margin-left: 8px;
  letter-spacing: 0.04em;
}

.msg__text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--hero-text);
}

.msg--xuan .msg__text {
  padding: 14px 18px;
  border-radius: 4px 18px 18px 18px;
  background-color: rgba(185, 174, 232, 0.16);
  border: 1px solid rgba(185, 174, 232, 0.22);
}

.msg__mention { color: var(--night-lavender); font-weight: 600; }

/* 回覆訊息：Discord 的引用列（小頭像 + 作者 + 被引用的內容）
   引用列橫跨整個訊息寬度，頭像與作者名落在下一列，
   所以頭像不會跟引用列並排（跟 Discord 一致）。 */
.msg--reply { row-gap: 3px; }

.msg__reply {
  position: relative;
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  padding-left: 50px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--hero-text-faint);
}

/* 連接線：折線落在頭像正中央（38px 頭像 → x=19），橫線拉到迷你頭像 */
.msg__reply::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 50%;
  width: 31px;
  height: 13px;
  border-left: 1px solid rgba(255, 255, 255, 0.30);
  border-top: 1px solid rgba(255, 255, 255, 0.30);
  border-top-left-radius: 7px;
}

.msg__reply img {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  flex: none;
  opacity: 0.85;
}

.msg__reply-name {
  flex: none;
  font-weight: 600;
  color: var(--hero-text-soft);
}

.msg__reply-text {
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.chat__foot {
  padding: 0 clamp(20px, 3vw, 30px) 22px;
  font-size: 12px;
  color: var(--hero-text-faint);
}

/* --------------------------------------------------------------------------
   一天的四個時刻（橫軸時間線）
   -------------------------------------------------------------------------- */

.day {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 32px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* 軸線：從早上的暖金過渡到深夜的淺紫。
   收在最後一顆圓點上，不要拖到版面右緣（4 欄、gap 32px 時最後一欄起點 = 75% + 24px）。 */
.day::before {
  content: "";
  position: absolute;
  left: 0;
  top: 35px;
  width: calc(75% + 24px);
  height: 1px;
  background-image: linear-gradient(
    90deg,
    var(--day-gold),
    var(--accent-star) 45%,
    var(--night-lavender)
  );
  opacity: 0.45;
}

.moment {
  position: relative;
  padding-top: 56px;
}

.moment__time {
  position: absolute;
  top: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* 圓點蓋在軸線上：底色遮住線，再用 box-shadow 描邊。
   底色要跟 section--tint 的 surface-subtle 一致，否則會浮成一顆白點。 */
.moment__dot {
  position: absolute;
  top: 30px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--surface-subtle);
  box-shadow: 0 0 0 1.5px currentColor;
  color: var(--day-gold);
}

.moment__dot--gold { color: var(--day-gold); }
.moment__dot--sky { color: var(--accent-sky); }
.moment__dot--lav { color: var(--night-lavender); }
.moment__dot--indigo { color: var(--night-indigo); }

.moment h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.moment p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.day__note {
  margin-top: 34px;
  font-size: 13px;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   語氣切換（Tabs）
   -------------------------------------------------------------------------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.tab {
  padding: 9px 20px;
  border-radius: var(--r-full);
  border: 1px solid var(--line);
  background-color: rgba(255, 255, 255, 0.6);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 240ms var(--ease);
}

.tab:hover {
  color: var(--text-primary);
  border-color: var(--line-strong);
}

.tab[aria-selected="true"] {
  background-image: var(--grad-warm);
  border-color: transparent;
  color: var(--outline-ink);
  box-shadow: var(--shadow-sm);
}

.tabpanel {
  position: relative;
  padding: clamp(28px, 4vw, 46px);
  border-radius: var(--r-lg);
  background-color: var(--surface-elevated);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  min-height: 260px;
}

.tabpanel[hidden] { display: none; }

.style-show__label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.style-show__label i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--day-gold);
  display: block;
}

.style-show__name {
  font-size: clamp(24px, 3vw, 32px);
  margin-bottom: 12px;
}

.style-show__desc {
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 26px;
}

.style-show__quote {
  position: relative;
  padding: 24px 26px;
  border-radius: var(--r-sm);
  background-image: linear-gradient(135deg, rgba(255, 232, 194, 0.55), rgba(237, 234, 247, 0.75));
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.8;
  color: var(--text-primary);
}

.style-show__quote::before {
  content: "示意";
  position: absolute;
  top: -9px;
  left: 22px;
  padding: 1px 9px;
  border-radius: var(--r-full);
  background-color: var(--surface-elevated);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

.styles__note {
  margin-top: 18px;
  font-size: 12.5px;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   指令
   -------------------------------------------------------------------------- */

.cmd-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-radius: var(--r-lg);
  background-color: var(--surface-elevated);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.cmd {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px;
  padding: 18px 26px;
  border-top: 1px solid var(--line);
  transition: background-color 200ms var(--ease);
}

.cmd:first-child { border-top: none; }
.cmd:hover { background-color: var(--surface-base); }

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

.cmd__name code {
  font-size: 13.5px;
  padding: 4px 10px;
  border-radius: var(--r-xs);
  background-color: var(--surface-subtle);
  border: 1px solid var(--line);
  color: var(--outline-ink);
}

.cmd__copy {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid transparent;
  border-radius: var(--r-xs);
  background-color: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 200ms var(--ease);
}

.cmd__copy:hover {
  background-color: var(--surface-subtle);
  color: var(--text-primary);
}

.cmd__copy.is-done { color: #22684C; background-color: rgba(159, 227, 196, 0.4); }
.cmd__copy svg { width: 14px; height: 14px; }

.cmd__desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.cmd__desc strong { color: var(--text-primary); font-weight: 600; }

.cmd__who {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  white-space: nowrap;
}

.cmd__who.is-admin { color: var(--night-indigo); }
.cmd__who.is-owner {
  color: #8A4A3E;
  background-color: rgba(244, 144, 126, 0.18);
  padding: 3px 10px;
  border-radius: var(--r-full);
}

.cmd-extra {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.cmd-extra__item {
  padding: 22px 24px;
  border-radius: var(--r-md);
  background-color: rgba(255, 255, 255, 0.66);
  border: 1px solid var(--line);
}

.cmd-extra__item h4 {
  font-size: 17px;
  margin-bottom: 8px;
}

.cmd-extra__item p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   記憶（深色）
   -------------------------------------------------------------------------- */

.memory {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}

.layers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.layer {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 20px;
  padding: 24px 26px;
  border-radius: var(--r-md);
  background-color: var(--glass-dark);
  border: 1px solid rgba(255, 255, 255, 0.10);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: background-color 300ms var(--ease), border-color 300ms var(--ease);
}

.layer:hover {
  background-color: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.18);
}

.layer__num {
  font-family: var(--font-latin);
  font-size: 44px;
  font-weight: 400;
  line-height: 1;
  color: transparent;
  background-image: linear-gradient(180deg, var(--day-cream), var(--night-lavender));
  -webkit-background-clip: text;
  background-clip: text;
  opacity: 0.85;
}

.layer h4 {
  font-size: 18px;
  color: var(--hero-text);
  margin-bottom: 6px;
}

.layer p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--hero-text-soft);
}

.layer__scope {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--hero-text-faint);
  padding: 2px 9px;
  border-radius: var(--r-full);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.memory__panel {
  padding: clamp(26px, 3vw, 36px);
  border-radius: var(--r-lg);
  background-color: var(--surface-elevated);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  color: var(--text-primary);
}

.memory__panel h3 {
  font-size: 22px;
  margin-bottom: 14px;
}

.memory__panel p {
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.memory__panel p + p { margin-top: 14px; }

.memory__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0;
  background-color: var(--line);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.stat {
  padding: 18px 20px;
  background-color: var(--surface-base);
}

.stat__num {
  font-family: var(--font-latin);
  font-size: 28px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--outline-ink);
}

.stat__label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   FAQ
   -------------------------------------------------------------------------- */

.faq-wrap {
  display: grid;
  grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}

.faq-wrap .section__head {
  position: sticky;
  top: 120px;
  margin-bottom: 0;
}

.faq {
  border-top: 1px solid var(--line);
}

.faq__item {
  border-bottom: 1px solid var(--line);
}

.faq__item summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 4px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
  transition: color 200ms var(--ease);
}

.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary:hover { color: var(--night-indigo); }

.faq__item summary::after {
  content: "";
  margin-left: auto;
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  border-right: 1.5px solid var(--text-muted);
  border-bottom: 1.5px solid var(--text-muted);
  transform: rotate(45deg) translateY(-3px);
  transition: transform 260ms var(--ease), border-color 200ms var(--ease);
}

.faq__item[open] summary::after {
  transform: rotate(225deg) translateY(-3px);
  border-color: var(--night-indigo);
}

.faq__a {
  padding: 0 4px 24px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-secondary);
  max-width: 62ch;
}

.faq__a p + p { margin-top: 10px; }
.faq__a a { text-decoration: underline; }

/* --------------------------------------------------------------------------
   CTA
   -------------------------------------------------------------------------- */

.cta { padding: 0 0 var(--section-y); }

.cta__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 7vw, 88px) clamp(28px, 5vw, 72px);
  border-radius: var(--r-xl);
  background-image: linear-gradient(120deg, var(--day-gold) 0%, var(--accent-star) 30%, var(--night-lavender) 72%, var(--night-indigo) 100%);
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.cta__panel::before,
.cta__panel::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
  pointer-events: none;
}

.cta__panel::before {
  width: 320px;
  height: 320px;
  top: -140px;
  left: -60px;
  background-color: var(--day-cream);
}

.cta__panel::after {
  width: 360px;
  height: 360px;
  bottom: -180px;
  right: -80px;
  background-color: var(--night-indigo);
}

.cta__panel > * { position: relative; }

.cta h2 {
  font-size: clamp(28px, 4vw, 44px);
  margin-bottom: 14px;
}

.cta p {
  max-width: 46ch;
  margin: 0 auto 30px;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(42, 36, 56, 0.78);
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.cta .btn--primary {
  background-image: none;
  background-color: var(--outline-ink);
  color: var(--hero-text);
}

.cta .btn--primary:hover {
  color: var(--hero-text);
  box-shadow: 0 20px 40px -20px rgba(42, 36, 56, 0.7);
}

.cta .btn--secondary {
  background-color: rgba(255, 255, 255, 0.55);
  border-color: rgba(42, 36, 56, 0.18);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

/* --------------------------------------------------------------------------
   頁尾
   -------------------------------------------------------------------------- */

.site-footer {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 7vw, 80px) 0 30px;
  border-top: 1px solid var(--line);
  background-color: var(--surface-subtle);
}

.site-footer::before {
  content: "XUAN";
  position: absolute;
  right: -6px;
  bottom: -58px;
  font-family: var(--font-latin);
  font-size: clamp(110px, 17vw, 200px);
  font-weight: 600;
  line-height: 0.8;
  letter-spacing: -0.02em;
  color: rgba(42, 36, 56, 0.035);
  pointer-events: none;
  user-select: none;
}

.footer__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(2, minmax(0, 0.75fr));
  gap: 40px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--line);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer__brand img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--line-strong);
}

.footer__brand strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.footer__brand span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.footer__desc {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.site-footer h5 {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 16px;
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.site-footer ul li { list-style: none; }

.site-footer a {
  font-size: 14px;
  color: var(--text-secondary);
}

.site-footer a:hover { color: var(--text-primary); }

.footer__bottom {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 22px;
  font-size: 12px;
  color: var(--text-muted);
}

.footer__bottom span {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* --------------------------------------------------------------------------
   文件頁（服務條款 / 隱私權）
   -------------------------------------------------------------------------- */

.doc-hero {
  position: relative;
  padding: clamp(130px, 16vw, 180px) 0 clamp(40px, 6vw, 64px);
  background-image: var(--grad-soft);
  border-bottom: 1px solid var(--line);
}

.doc-hero .eyebrow { color: var(--text-muted); margin-bottom: 20px; }

.doc-hero h1 {
  font-size: clamp(34px, 5vw, 54px);
  margin-bottom: 16px;
}

.doc-hero p {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.doc-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.doc {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  padding: clamp(40px, 6vw, 72px) 0 clamp(64px, 9vw, 110px);
  align-items: start;
}

.doc__toc {
  position: sticky;
  top: 110px;
  padding: 22px 20px;
  border-radius: var(--r-md);
  background: var(--glass);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-xs);
}

.doc__toc h2 {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.doc__toc ol {
  list-style: none;
  counter-reset: toc;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.doc__toc li { counter-increment: toc; }

.doc__toc a {
  display: block;
  padding: 6px 8px;
  border-radius: var(--r-xs);
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.doc__toc a::before {
  content: counter(toc, decimal-leading-zero) "  ";
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
}

.doc__toc a:hover {
  background-color: var(--ink-veil);
  color: var(--text-primary);
  text-decoration: none;
}

.doc__body { max-width: 730px; }

.doc__body section {
  padding-bottom: 34px;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.doc__body section:last-of-type { border-bottom: none; }

.doc__body h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 23px;
  margin-bottom: 14px;
}

.doc__body h2 span {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}

.doc__body h3 {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--night-indigo);
  margin: 22px 0 8px;
}

.doc__body p {
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-secondary);
}

.doc__body p + p { margin-top: 12px; }

.doc__body ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.doc__body ul li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.doc__body ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--day-gold);
}

.doc__body strong { color: var(--text-primary); font-weight: 600; }
.doc__body a { text-decoration: underline; }

.callout {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
  padding: 20px 22px;
  border-radius: var(--r-sm);
  background-image: linear-gradient(135deg, rgba(237, 234, 247, 0.9), rgba(255, 247, 236, 0.9));
  border: 1px solid var(--line);
}

.callout svg {
  width: 20px;
  height: 20px;
  margin-top: 3px;
  color: var(--night-indigo);
}

.callout p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-primary);
}

.callout strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 15.5px;
  margin-bottom: 4px;
}

.doc__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   進場動畫
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 1;
  transform: none;
}

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}

.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   響應式
   -------------------------------------------------------------------------- */

@media (max-width: 1080px) {
  .hero__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

  .hero__visual {
    width: min(420px, 92%);
    margin: 0 auto;
    order: -1;
  }

  .hero__lead { max-width: 48ch; }

  /* 兩欄時橫軸失去意義，改成「圓點 + 時間」的標籤 */
  .day {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px 32px;
  }

  .day::before { display: none; }

  .moment { padding-top: 0; }

  .moment__time {
    position: static;
    display: block;
    margin-bottom: 8px;
    padding-left: 19px;
  }

  .moment__dot {
    top: 3px;
    left: 0;
  }

  .about,
  .memory,
  .faq-wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .about__quote,
  .faq-wrap .section__head {
    position: static;
  }

  .section__head--split {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .section__head--split .section__desc {
    justify-self: start;
  }

  .timeline { grid-template-columns: minmax(0, 1fr); gap: 8px; }

  .timeline::before {
    top: 0;
    bottom: 0;
    left: 6px;
    right: auto;
    width: 1px;
    height: auto;
    background-image: linear-gradient(180deg, var(--day-gold), var(--night-lavender), transparent);
  }

  .step { padding: 0 0 0 34px; }
  .step::before { top: 8px; left: 0; }
  .step__num { position: static; display: block; margin-bottom: 4px; }

  .cmd {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 10px 18px;
  }

  .cmd__who { grid-column: 2; }

  .doc { grid-template-columns: minmax(0, 1fr); }
  .doc__toc { position: static; }
  .doc__toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 8px; }
}

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__toggle { display: inline-flex; }

  .nav.is-open {
    flex-wrap: wrap;
    border-radius: var(--r-md);
    background: var(--glass-strong);
  }

  .nav.is-open .nav__links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: static;
    order: 3;
    width: 100%;
    margin: 10px 0 0;
    padding: 10px 0 0;
    gap: 2px;
    border-top: 1px solid var(--line);
  }

  .nav.is-open .nav__links a {
    padding: 11px 12px;
    font-size: 15px;
    border-radius: var(--r-sm);
  }

  .nav.is-open .nav__cta {
    display: inline-flex;
    order: 4;
    width: 100%;
    margin-top: 10px;
    justify-content: center;
  }

  .hero__stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .hero__stats div { padding: 16px 0; }

  .hero__stats div + div {
    padding-left: 0;
    border-left: none;
    border-top: 1px solid var(--line-inverse);
  }

  .cmd-extra { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .site-header { --head-pad: 10px; }
  .nav { padding: 7px 8px 7px 12px; }

  .hero { padding-top: 108px; }
  .hero__title { font-size: clamp(72px, 22vw, 104px); }
  .hero__latin { letter-spacing: 0.4em; }

  .hero__tag { font-size: 11px; padding: 7px 12px; }
  .hero__tag--2 { right: -4%; }

  .day {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

  .cmd {
    grid-template-columns: minmax(0, 1fr);
    padding: 18px 20px;
  }

  .cmd__who { grid-column: 1; }

  .memory__stats { grid-template-columns: minmax(0, 1fr); }

  .layer {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 14px;
    padding: 20px;
  }

  .layer__num { font-size: 34px; }

  .footer__grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }

  .doc__toc ol { grid-template-columns: minmax(0, 1fr); }

  .doc-hero { padding-top: 118px; }

  .chat__body { gap: 18px; }

  .msg { grid-template-columns: 32px minmax(0, 1fr); gap: 10px; }
  .msg__avatar { width: 32px; height: 32px; }

  .about__quote { padding: 28px 24px 24px; }
  .about__quote p { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js .reveal { opacity: 1; transform: none; }
}

@media print {
  .site-header,
  .nav__toggle,
  .cta,
  .site-footer,
  .marquee {
    display: none;
  }

  body { background-color: var(--surface-elevated); }
  .doc { grid-template-columns: minmax(0, 1fr); }
  .doc__toc { display: none; }
}

/* ==========================================================================
   v3 layer — 暖光 × 精密
   在 v2 的襯線／玻璃／柔和陰影之上，加入星系、格線、刻度環與 mono 讀數。
   ========================================================================== */

:root {
  --grid-light: rgba(255, 247, 236, 0.055);
  --grid-ink: rgba(42, 36, 56, 0.05);
  --rim: rgba(255, 232, 194, 0.55);
  --hair: rgba(255, 247, 236, 0.12);
  --deep: #1F1A2C;
  --amber-glow: rgba(242, 178, 90, 0.30);
}

/* --------------------------------------------------------------------------
   Hero：星系
   -------------------------------------------------------------------------- */

.hero {
  --celestial-x: 49.5%;
  --celestial-y: 43%;
  --moon-dx: -8.5%;
  --moon-dy: -6.5%;
  --celestial-scale: 1;
  padding-top: clamp(132px, 16vw, 196px);
  background-image:
    radial-gradient(120% 130% at 74% -12%, #463E6C 0%, #2F2945 36%, #221D33 76%, var(--deep) 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-light) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-light) 1px, transparent 1px);
  background-size: 78px 78px;
  -webkit-mask-image: radial-gradient(130% 105% at 50% 6%, #000 12%, transparent 74%);
  mask-image: radial-gradient(130% 105% at 50% 6%, #000 12%, transparent 74%);
}

.hero__nebula,
.hero__disk {
  position: absolute;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 1;
}

.hero__nebula {
  left: var(--celestial-x);
  top: var(--celestial-y);
}

.hero__disk {
  left: calc(var(--celestial-x) + var(--moon-dx));
  top: calc(var(--celestial-y) + var(--moon-dy));
}

.hero__nebula {
  width: min(1080px, 108vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background-image: radial-gradient(circle at 50% 50%,
    rgba(255, 244, 220, 0.26) 0%,
    rgba(242, 178, 90, 0.15) 16%,
    rgba(232, 147, 92, 0.08) 38%,
    transparent 66%);
  filter: blur(34px);
  opacity: 0.62;
}

.hero__disk {
  width: min(720px, 82vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background-image: radial-gradient(circle at 50% 50%,
    rgba(185, 174, 232, 0.22) 0%,
    rgba(143, 184, 224, 0.10) 42%,
    transparent 68%);
  filter: blur(42px);
  opacity: 0.85;
}

.hero__sky {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
  will-change: transform;
}

.hero__inner {
  position: relative;
  z-index: 3;
}

.hero__stats-wrap {
  position: relative;
  z-index: 3;
}

/* 左側垂直讀數 */
.hero__rail {
  position: absolute;
  left: -30px;
  top: 4%;
  bottom: 10%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: rgba(255, 247, 236, 0.55);
}

.hero__rail i {
  flex: 1;
  width: 1px;
  background-image: linear-gradient(180deg, transparent, rgba(255, 247, 236, 0.30), transparent);
}

@media (max-width: 1360px) {
  .hero__rail { display: none; }
}

/* 標題暖光 */
.hero__title {
  font-size: clamp(96px, 14vw, 186px);
  text-shadow: 0 0 90px rgba(242, 178, 90, 0.30);
}

.hero__latin {
  position: relative;
  padding-left: 2px;
}

/* 刻度環 */
.hero__dial {
  position: absolute;
  width: 96%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background-image: repeating-conic-gradient(from 0deg,
    rgba(255, 247, 236, 0.55) 0deg 0.3deg,
    transparent 0.3deg 6deg);
  -webkit-mask-image: radial-gradient(closest-side, transparent 79%, #000 79.8%);
  mask-image: radial-gradient(closest-side, transparent 79%, #000 79.8%);
  opacity: 0.45;
  animation: spin 160s linear infinite;
}

/* 四角框線 */
.hero__frame {
  position: absolute;
  width: 80%;
  aspect-ratio: 1 / 1;
  pointer-events: none;
  z-index: 1;
  background-image:
    linear-gradient(var(--rim), var(--rim)),
    linear-gradient(var(--rim), var(--rim)),
    linear-gradient(var(--rim), var(--rim)),
    linear-gradient(var(--rim), var(--rim)),
    linear-gradient(var(--rim), var(--rim)),
    linear-gradient(var(--rim), var(--rim)),
    linear-gradient(var(--rim), var(--rim)),
    linear-gradient(var(--rim), var(--rim));
  background-size:
    22px 1px, 1px 22px,
    22px 1px, 1px 22px,
    22px 1px, 1px 22px,
    22px 1px, 1px 22px;
  background-position:
    left top, left top,
    right top, right top,
    left bottom, left bottom,
    right bottom, right bottom;
  background-repeat: no-repeat;
}

/* 數據列：mono 讀數感 */
.hero__stats span::before {
  content: "// ";
  font-family: var(--font-mono);
  color: var(--day-gold);
  opacity: 0.85;
}

.hero__stats b {
  font-size: 34px;
}

/* --------------------------------------------------------------------------
   Eyebrow：區塊編號
   -------------------------------------------------------------------------- */

.eyebrow b {
  font-weight: 500;
  color: var(--night-indigo);
  margin-right: 4px;
}

.hero .eyebrow b,
.section--dark .eyebrow b {
  color: var(--day-gold);
}

.eyebrow::before {
  background-image: linear-gradient(90deg, currentColor, transparent);
}

/* --------------------------------------------------------------------------
   區塊：格線與暖光
   -------------------------------------------------------------------------- */

.section {
  position: relative;
}

.section--tint {
  background-image: radial-gradient(70% 60% at 88% 0%, rgba(242, 178, 90, 0.12), transparent 68%);
}

.section--dusk {
  background-image:
    radial-gradient(60% 50% at 8% 0%, rgba(185, 174, 232, 0.18), transparent 70%),
    radial-gradient(50% 45% at 92% 100%, rgba(242, 178, 90, 0.12), transparent 72%),
    var(--grad-soft);
}

.section--dark {
  background-image:
    radial-gradient(110% 100% at 82% 0%, #4A4270 0%, #302A46 44%, var(--outline-ink) 88%, var(--deep) 100%);
}

.section--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-light) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-light) 1px, transparent 1px);
  background-size: 78px 78px;
  -webkit-mask-image: radial-gradient(120% 100% at 70% 0%, #000 8%, transparent 78%);
  mask-image: radial-gradient(120% 100% at 70% 0%, #000 8%, transparent 78%);
}

.section--dark > .wrap {
  position: relative;
  z-index: 1;
}

.section__title {
  position: relative;
}

/* --------------------------------------------------------------------------
   技術規格
   -------------------------------------------------------------------------- */

.spec {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(32px, 5vw, 72px);
  border-top: 1px solid var(--line-strong);
}

.spec__row {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--line);
}

.spec__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-top: 4px;
}

.spec__key::before {
  content: "// ";
  color: var(--day-gold);
}

.spec__val {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.spec__val strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 3px;
  letter-spacing: 0.01em;
}

.spec__note {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   CTA：格線與光
   -------------------------------------------------------------------------- */

.cta__panel {
  background-image:
    linear-gradient(to right, rgba(42, 36, 56, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 36, 56, 0.07) 1px, transparent 1px),
    linear-gradient(120deg, var(--day-gold) 0%, var(--accent-star) 30%, var(--night-lavender) 72%, var(--night-indigo) 100%);
  background-size: 64px 64px, 64px 64px, auto;
}

/* --------------------------------------------------------------------------
   對話窗：外圈微光
   -------------------------------------------------------------------------- */

.chat {
  box-shadow:
    0 0 0 1px rgba(185, 174, 232, 0.20),
    0 0 120px -48px rgba(185, 174, 232, 0.55),
    var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   導覽：頂端金色細線
   -------------------------------------------------------------------------- */

.nav::before {
  content: "";
  position: absolute;
  left: 28px;
  right: 28px;
  top: 0;
  height: 1px;
  background-image: linear-gradient(90deg, transparent, rgba(242, 178, 90, 0.55), transparent);
}

/* --------------------------------------------------------------------------
   頁尾：讀數列
   -------------------------------------------------------------------------- */

.footer__meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 18px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.footer__meta span:first-child::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 9px;
  border-radius: 50%;
  background-color: var(--day-gold);
  vertical-align: middle;
}

/* --------------------------------------------------------------------------
   文件頁：淡格線
   -------------------------------------------------------------------------- */

.doc-hero {
  background-image:
    linear-gradient(to right, var(--grid-ink) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-ink) 1px, transparent 1px),
    var(--grad-soft);
  background-size: 78px 78px, 78px 78px, auto;
}

/* --------------------------------------------------------------------------
   響應式
   -------------------------------------------------------------------------- */

@media (max-width: 1080px) {
  .hero {
    --celestial-x: 17%;
    --celestial-y: 26%;
    --moon-dx: 66%;
    --moon-dy: -8%;
    --celestial-scale: 0.85;
  }

  .hero__nebula { width: min(760px, 130vw); }
  .hero__disk { width: min(520px, 96vw); }

  .spec { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .hero {
    --celestial-x: 13%;
    --celestial-y: 24%;
    --moon-dx: 71%;
    --moon-dy: -9%;
    --celestial-scale: 0.72;
    padding-top: 104px;
  }

  .hero__frame { width: 84%; }
  .hero__dial { width: 98%; }

  .spec__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 16px 0 18px;
  }

  .spec__key { padding-top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .hero__dial { animation: none; }
}


/* --------------------------------------------------------------------------
   捲動效果：進度條、導覽收合、逐項進場
   -------------------------------------------------------------------------- */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--day-gold), var(--night-lavender), var(--accent-sky));
  z-index: 200;
  pointer-events: none;
}

.site-header {
  transition: padding 320ms var(--ease);
}

.site-header.is-scrolled {
  padding: 8px 0;
}

.site-header.is-scrolled .nav {
  box-shadow: var(--shadow-md);
}

.hero__copy {
  will-change: transform;
}

.stagger {
  opacity: 0;
}

.stagger.is-in {
  opacity: 1;
  animation: rise-in 640ms var(--ease) var(--d, 0ms) backwards;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .stagger { opacity: 1; }
  .stagger.is-in { animation: none; }
}

/* --------------------------------------------------------------------------
   導覽列 v4：開頭透明，捲動後深色條滑出
   -------------------------------------------------------------------------- */

.site-header,
.site-header.is-scrolled {
  --head-pad: 14px;
  padding: var(--head-pad) 0;
}

.nav-bar {
  position: absolute;
  inset: calc(-1 * var(--head-pad)) 0 0;
  background-color: rgba(27, 22, 38, 0.94);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid rgba(255, 247, 236, 0.10);
  border-radius: 0 0 20px 20px;
  box-shadow: 0 24px 50px -30px rgba(0, 0, 0, 0.65);
  transform: translateY(-104%);
  transition: transform 520ms var(--ease);
  pointer-events: none;
}

.site-header.is-scrolled .nav-bar {
  transform: translateY(0);
}

.nav {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  padding: 8px 0;
}

.nav::before {
  content: none;
}

.site-header.is-scrolled .nav {
  box-shadow: none;
}

.brand {
  color: var(--hero-text);
}

.brand__mark {
  box-shadow: 0 0 0 1px rgba(255, 247, 236, 0.35);
}

.brand__latin {
  color: rgba(255, 247, 236, 0.55);
}

.nav__links a {
  color: rgba(255, 247, 236, 0.72);
}

.nav__links a:hover {
  color: var(--hero-text);
  background-color: rgba(255, 247, 236, 0.10);
}

.nav__links a.is-active {
  color: var(--hero-text);
  background-color: rgba(255, 247, 236, 0.14);
}

.nav__toggle {
  background-color: rgba(255, 247, 236, 0.10);
  border-color: rgba(255, 247, 236, 0.22);
}

.nav__toggle span {
  background-color: var(--hero-text);
}

@media (max-width: 900px) {
  .nav.is-open {
    background-color: rgba(27, 22, 38, 0.97);
    border-color: rgba(255, 247, 236, 0.12);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
  }

  .nav.is-open .nav__links {
    border-top-color: rgba(255, 247, 236, 0.12);
  }

  .nav.is-open .nav__links a {
    color: rgba(255, 247, 236, 0.82);
  }

  .nav.is-open .nav__links a:hover {
    background-color: rgba(255, 247, 236, 0.10);
    color: var(--hero-text);
  }

  .nav.is-open .nav__links a.is-active {
    background-color: rgba(255, 247, 236, 0.14);
  }
}

/* Hero 互動提示 */
.hero__hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: rgba(255, 247, 236, 0.42);
}

.hero__hint span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--day-gold);
  animation: hint-pulse 2.4s ease-in-out infinite;
}

@keyframes hint-pulse {
  0%, 100% { opacity: 0.35; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1); }
}

@media (hover: none) {
  .hero__hint { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .hero__hint span { animation: none; opacity: 0.7; }
}

/* --------------------------------------------------------------------------
   多層視差
   -------------------------------------------------------------------------- */

[data-parallax] {
  will-change: transform;
}

.par {
  display: block;
}

@media (prefers-reduced-motion: reduce) {
  [data-parallax] {
    will-change: auto;
  }
}

@media (max-width: 720px) {
  .site-header {
    --head-pad: 10px;
  }
}

/* 內文變短後，引言卡改成垂直置中，不用 sticky */
.about {
  align-items: center;
}

.about__quote {
  position: static;
}