/* ============================================================
   University Helper · showcase + wiki
   概念「一夜」：展示页是夜（22:00→06:00），文档页是昼。
   ============================================================ */

:root {
  /* 夜的调色盘 */
  --night:   #050A14;   /* 夜空底色 */
  --deep:    #0A1428;   /* 深夜面板 */
  --panel:   #0D1A33;   /* 卡片表面 */
  --line:    rgba(143, 163, 192, 0.16);
  --paper:   #E9F0FA;   /* 月白（正文） */
  --muted:   #8FA3C0;   /* 弱化文字 */
  --signal:  #5B9DFF;   /* 信号蓝（暗底品牌色） */
  --brand:   #2563EB;   /* 品牌蓝 */
  --lamp:    #FFB454;   /* 台灯黄（时间刻度、高亮） */
  --done:    #3DDC97;   /* 完成绿（只用于「已完成」语义） */

  /* 昼的调色盘 */
  --day-bg:    #F3F7FC;
  --day-card:  #FFFFFF;
  --day-ink:   #16243D;
  --day-muted: #5A6B85;
  --day-line:  #DCE5F1;
  --day-code:  #0D1A33;

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --sans:  "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
           -apple-system, "Segoe UI", sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  --ease-premium: cubic-bezier(0.4, 0, 0.2, 1);
  --maxw: 1100px;
}

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

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

body {
  font-family: var(--sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.mono { font-family: var(--mono); letter-spacing: 0.02em; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px, 4vw, 48px); }

a { color: inherit; }
:focus-visible { outline: 2px solid var(--lamp); outline-offset: 3px; border-radius: 2px; }

/* ============================================================
   夜 · 展示页
   ============================================================ */

body.night {
  background: var(--night);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 夜空 ---------- */
.sky { position: fixed; inset: 0; z-index: -1; }
.sky-layer { position: absolute; inset: 0; opacity: 0; }
.sky-night {
  opacity: 1;
  background:
    radial-gradient(120% 80% at 80% -10%, #0B1B36 0%, transparent 55%),
    radial-gradient(90% 60% at 10% 110%, #081226 0%, transparent 60%),
    var(--night);
}
/* 银河：一条斜过夜空的微光带 */
.sky-night::after {
  content: "";
  position: absolute; inset: -25%;
  background: linear-gradient(112deg,
    transparent 38%,
    rgba(150, 180, 230, 0.030) 46%,
    rgba(214, 226, 248, 0.065) 50%,
    rgba(150, 180, 230, 0.030) 54%,
    transparent 62%);
}

/* ---------- 月亮与太阳（位置由滚动驱动） ---------- */
.moon {
  position: absolute; top: 0; left: 0;
  width: clamp(72px, 9vw, 120px); aspect-ratio: 1;
  will-change: transform, opacity;
}
.moon i {
  display: block; width: 100%; height: 100%; border-radius: 50%;
  background:
    radial-gradient(circle at 63% 58%, rgba(112, 122, 142, 0.38) 0 7%, transparent 8%),
    radial-gradient(circle at 41% 70%, rgba(112, 122, 142, 0.30) 0 5%, transparent 6%),
    radial-gradient(circle at 53% 33%, rgba(112, 122, 142, 0.32) 0 4%, transparent 5%),
    radial-gradient(circle at 30% 48%, rgba(112, 122, 142, 0.22) 0 3.4%, transparent 4.4%),
    radial-gradient(circle at 36% 35%, #FBF8EE 0%, #E7E2D4 55%, #C3C0B5 100%);
  box-shadow:
    0 0 46px 14px rgba(235, 230, 215, 0.22),
    0 0 170px 64px rgba(190, 200, 226, 0.10);
}
.sun {
  position: absolute; top: 0; left: 0;
  width: clamp(96px, 11vw, 152px); aspect-ratio: 1;
  opacity: 0;
  will-change: transform, opacity;
}
.sun i {
  display: block; width: 100%; height: 100%; border-radius: 50%;
  background: radial-gradient(circle at 50% 42%, #FFF9E8 0%, #FFE3A1 45%, #FFB35C 78%, #F88E54 100%);
  box-shadow:
    0 0 70px 26px rgba(255, 205, 120, 0.50),
    0 0 240px 110px rgba(255, 160, 110, 0.28);
}
.sky-predawn {
  background: linear-gradient(180deg, #0A1730 0%, #11244A 55%, #1B3261 100%);
}
.sky-dawn {
  background: linear-gradient(180deg,
    #27396B 0%, #4A4576 30%, #7A5170 55%, #C76B5B 78%, #F2A65A 92%, #FFD58E 100%);
}
.stars { position: absolute; inset: 0; }
.star {
  position: absolute;
  width: 2px; height: 2px;
  border-radius: 50%;
  background: #CFE0F5;
  opacity: 0.25;
}
.js-anim .star { animation: twinkle var(--tw-dur, 3.4s) ease-in-out var(--tw-delay, 0s) infinite; }
@keyframes twinkle {
  0%, 100% { opacity: 0.14; }
  50%      { opacity: var(--tw-peak, 0.9); }
}
.meteor {
  position: absolute;
  top: 12%; left: 70%;
  width: 130px; height: 1px;
  background: linear-gradient(90deg, rgba(207, 224, 245, 0) 0%, rgba(207, 224, 245, 0.9) 100%);
  transform: rotate(-32deg);
  opacity: 0;
}
@media (prefers-reduced-motion: reduce) {
  .star, .js-anim .star { animation: none; opacity: 0.4; }
  .meteor { display: none; }
}

/* ---------- 顶栏 ---------- */
.hud {
  --hud-a: 0.82;
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px clamp(20px, 3vw, 36px);
  background: linear-gradient(180deg, rgba(5, 10, 20, var(--hud-a)) 0%, rgba(5, 10, 20, 0) 100%);
}
.hud-brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 0.95rem; text-decoration: none; color: var(--paper);
}
.hud-right { display: flex; align-items: center; gap: clamp(12px, 2.4vw, 28px); }
.hud-phase { font-size: 0.72rem; color: var(--lamp); letter-spacing: 0.18em; }
.hud-clock { font-size: 1.05rem; color: var(--paper); font-weight: 500; font-variant-numeric: tabular-nums; }
.hud-nav { display: flex; gap: 18px; }
.hud-link {
  font-size: 0.85rem; text-decoration: none; color: var(--muted);
  transition: color 0.25s var(--ease-premium);
}
.hud-link:hover { color: var(--paper); }

.night-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 60;
  background: rgba(143, 163, 192, 0.12);
}
.night-progress i {
  display: block; height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--signal), var(--lamp));
  transform: scaleX(0); transform-origin: left center;
}

/* ---------- 左侧时刻导航 ---------- */
.hour-rail {
  position: fixed; left: clamp(14px, 2vw, 28px); top: 50%; z-index: 40;
  transform: translateY(-50%);
  display: flex; flex-direction: column; gap: 22px;
}
.hour-rail a {
  display: flex; align-items: baseline; gap: 10px;
  text-decoration: none; color: var(--muted);
  font-size: 0.72rem;
  opacity: 0.55;
  transition: opacity 0.3s var(--ease-premium), color 0.3s var(--ease-premium),
              transform 0.3s var(--ease-premium);
}
.hour-rail time { font-size: 0.72rem; font-variant-numeric: tabular-nums; }
.hour-rail a:hover { opacity: 1; }
.hour-rail a.active { opacity: 1; color: var(--lamp); transform: translateX(4px); }
@media (max-width: 1180px) { .hour-rail { display: none; } }

/* ---------- 英雄区 ---------- */
.hero {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  position: relative;
  padding: 120px 0 80px;
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  width: 100%;
}
.eyebrow {
  font-size: 0.78rem; color: var(--lamp); letter-spacing: 0.22em;
  margin-bottom: 26px;
}
.hero-sub {
  font-size: clamp(1rem, 1.4vw, 1.13rem);
  color: var(--muted); max-width: 34em;
}
.hero-sub strong { color: var(--paper); font-weight: 700; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.btn {
  display: inline-block;
  padding: 13px 26px;
  font-size: 0.95rem; font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  transition: transform 0.3s var(--ease-premium), box-shadow 0.3s var(--ease-premium),
              background 0.3s var(--ease-premium), border-color 0.3s var(--ease-premium);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--brand); color: #fff;
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.35);
}
.btn-primary:hover { box-shadow: 0 10px 32px rgba(37, 99, 235, 0.5); }
.btn-ghost {
  border: 1px solid var(--line); color: var(--paper);
}
.btn-ghost:hover { border-color: var(--muted); }
.hero-tags { margin-top: 26px; font-size: 0.74rem; color: var(--muted); }

/* 对联（签名元素） */
.hero-couplet {
  display: flex; flex-direction: column; align-items: center; gap: 22px;
  justify-self: center;
}
.couplet-banner {
  font-size: 0.72rem; color: var(--lamp); letter-spacing: 0.3em;
  border: 1px solid rgba(255, 180, 84, 0.35);
  padding: 7px 18px; border-radius: 3px;
}
.couplet { line-height: 1; }
.couplet-strips {
  display: flex; flex-direction: row-reverse; gap: clamp(18px, 2.6vw, 34px);
}
.strip {
  display: flex; flex-direction: column; align-items: center;
  gap: clamp(6px, 1vw, 14px);
  padding: clamp(18px, 2.2vw, 28px) clamp(10px, 1.4vw, 16px);
  border: 1px solid rgba(255, 180, 84, 0.28);
  border-radius: 4px;
  background: linear-gradient(180deg, rgba(13, 26, 51, 0.55), rgba(13, 26, 51, 0.15));
}
.strip b {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(3rem, 6.5vw, 5.2rem);
  color: var(--paper);
  text-shadow: 0 0 44px rgba(91, 157, 255, 0.35);
}

/* 任务便签：一截虚线之下，不加框 */
.ticket {
  margin-top: 46px;
  max-width: 380px;
  border-top: 1px dashed rgba(143, 163, 192, 0.3);
  padding-top: 18px;
}
.ticket-head {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.68rem; color: var(--muted); letter-spacing: 0.14em;
  margin-bottom: 8px;
}
.ticket-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--lamp);
  box-shadow: 0 0 10px var(--lamp);
}
.js-anim .ticket-dot { animation: pulse 2.2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.ticket-course { font-size: 0.95rem; font-weight: 500; margin-bottom: 10px; }
.ticket-bar {
  height: 5px; border-radius: 3px; overflow: hidden;
  background: rgba(143, 163, 192, 0.18);
}
.ticket-bar i {
  display: block; height: 100%; width: 100%;
  background: var(--signal);
  border-radius: 3px;
  transform: scaleX(0); transform-origin: left center;
}
.ticket-bar i.is-done { background: var(--done); }
.ticket-meta {
  display: flex; justify-content: space-between;
  margin-top: 8px;
  font-size: 0.7rem; color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.ticket-meta .is-done { color: var(--done); }

.scroll-cue {
  position: absolute; bottom: 28px; left: 50%;
  transform: translateX(-50%);
  font-size: 0.72rem; color: var(--muted);
  text-decoration: none; letter-spacing: 0.2em;
  transition: color 0.3s var(--ease-premium);
}
.scroll-cue:hover { color: var(--lamp); }

/* ---------- 章节通用 ---------- */
.section { padding: clamp(110px, 14vh, 170px) 0; position: relative; }
.sec-head { max-width: 620px; margin-bottom: clamp(40px, 6vh, 64px); }
.sec-time {
  display: inline-block;
  font-size: 0.78rem; color: var(--lamp);
  letter-spacing: 0.24em;
  border-bottom: 1px solid rgba(255, 180, 84, 0.4);
  padding-bottom: 6px; margin-bottom: 20px;
  font-variant-numeric: tabular-nums;
}
.sec-title {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  line-height: 1.25;
  margin-bottom: 14px;
}
.sec-sub { color: var(--muted); font-size: clamp(0.95rem, 1.2vw, 1.05rem); }

/* ---------- 23:30 接入：编辑部式双栏，中央一条发丝线 ---------- */
.platform-grid {
  position: relative;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 7vw, 110px);
}
.platform-grid::before {
  content: "";
  position: absolute; left: 50%; top: -8px; bottom: -8px; width: 1px;
  background: linear-gradient(180deg, transparent, rgba(143, 163, 192, 0.35) 18%, rgba(143, 163, 192, 0.35) 82%, transparent);
}
.platform { position: relative; padding: 8px 0; }
.platform:nth-child(2) { margin-top: clamp(40px, 6vw, 76px); }
/* 巨大的水印字：星 / 树 */
.platform::before {
  content: attr(data-glyph);
  position: absolute; right: -0.08em; top: -0.42em;
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(9rem, 15vw, 14rem);
  line-height: 1;
  color: var(--paper);
  opacity: 0.045;
  pointer-events: none;
}
.platform-name {
  display: flex; align-items: baseline; gap: 16px;
  margin-bottom: 26px;
}
.platform-zh { font-family: var(--serif); font-weight: 900; font-size: clamp(1.6rem, 2.6vw, 2.2rem); }
.platform-en { font-size: 0.68rem; color: var(--lamp); letter-spacing: 0.3em; text-transform: uppercase; }
.feature-list { list-style: none; }
.feature-list li {
  position: relative;
  padding: 8px 0 8px 30px;
  color: var(--paper); font-size: 0.98rem;
}
.feature-list li::before {
  content: "—";
  position: absolute; left: 0; color: var(--signal); opacity: 0.7;
}
.platform-api {
  margin-top: 24px;
  font-size: 0.68rem; color: var(--muted);
  overflow-wrap: anywhere;
}

/* ---------- 01:00 夜班：一条「夜之线」垂直时间轴 ---------- */
.engine { padding: 0; }
.engine-pin { padding: clamp(110px, 14vh, 170px) 0; }
.shift {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}
.shift-flow { position: relative; }
.shift-thread {
  position: absolute;
  left: calc(64px + 18px + 4px); /* time 列宽 + 间距 + 节点半径 */
  top: 10px; bottom: 10px; width: 1px;
  background: rgba(143, 163, 192, 0.16);
}
.shift-thread i {
  display: block; width: 100%; height: 100%;
  background: linear-gradient(180deg, var(--lamp), var(--signal));
  transform: scaleY(0); transform-origin: top center;
}
.shift-list { list-style: none; }
.shift-item {
  display: grid;
  grid-template-columns: 64px 9px minmax(0, 1fr);
  column-gap: 18px;
  align-items: start;
  padding: 17px 0;
}
.shift-item time {
  font-size: 0.74rem; color: var(--lamp);
  font-variant-numeric: tabular-nums;
  text-align: right;
  padding-top: 3px;
}
.shift-node {
  width: 9px; height: 9px; border-radius: 50%;
  background: #22324F;
  margin-top: 8px;
  position: relative; z-index: 1;
}
.shift-body { min-width: 0; padding-left: 4px; }
.shift-name { font-size: 1rem; }
.shift-done {
  font-size: 0.72rem; color: var(--done);
  white-space: nowrap;
  display: inline-block;
  margin-left: 14px;
}
.shift-bar {
  display: block;
  margin-top: 10px;
  height: 2px;
  max-width: 360px;
  background: rgba(143, 163, 192, 0.14);
  overflow: hidden;
}
.shift-bar i {
  display: block; height: 100%; width: 100%;
  background: var(--signal);
  transform: scaleX(0); transform-origin: left center;
}
/* 机器的低语：不加框的日志，行首错落 */
.shift-log {
  padding-top: 86px;
  font-size: 0.72rem; line-height: 2.4;
  color: var(--muted);
  opacity: 0.85;
  overflow-wrap: anywhere;
}
.log-line:nth-child(2n) { margin-left: 1.6em; }
.log-line:nth-child(3n) { margin-left: 0.7em; }
.log-line:last-child { color: var(--done); }
.shift-clear {
  margin-top: 34px;
  font-size: 0.8rem; color: var(--done); letter-spacing: 0.1em;
}

/* ---------- 03:00 隔离：凌晨的宿舍楼 ---------- */
.iso {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(36px, 6vw, 84px);
  align-items: center;
}
.dorm-wrap {
  display: flex; flex-direction: column; align-items: center;
  margin: 0;
}
.dorm {
  position: relative;
  width: min(320px, 86%);
  background: #02060D;
  padding: clamp(22px, 3vw, 32px) clamp(20px, 2.6vw, 28px);
  box-shadow: inset 0 1px 0 rgba(143, 163, 192, 0.14);
}
/* 楼顶水箱 */
.dorm-tank {
  position: absolute; top: -22px; right: 38px;
  width: 34px; height: 22px;
  background: #02060D;
  box-shadow: inset 0 1px 0 rgba(143, 163, 192, 0.12);
}
.dorm-tank::after {
  content: "";
  position: absolute; left: 6px; right: 6px; bottom: -1px; top: 18px;
  border-left: 3px solid #02060D; border-right: 3px solid #02060D;
}
.dorm-windows {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: clamp(10px, 1.4vw, 14px) clamp(12px, 1.8vw, 18px);
}
.win {
  aspect-ratio: 1 / 1.05;
  background: #0A1322;
  border-radius: 1px;
}
.win-late {
  background: #E8A04C;
  box-shadow: 0 0 16px rgba(255, 180, 84, 0.4);
}
.win-you {
  background: #5B9DFF;
  box-shadow: 0 0 20px rgba(91, 157, 255, 0.6);
}
.js-anim .win-you { animation: winwork 3.4s ease-in-out infinite; }
@keyframes winwork {
  0%, 100% { box-shadow: 0 0 20px rgba(91, 157, 255, 0.6); }
  50%      { box-shadow: 0 0 11px rgba(91, 157, 255, 0.32); }
}
.dorm-ground {
  display: block;
  width: 135%; max-width: 440px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(143, 163, 192, 0.3) 18%, rgba(143, 163, 192, 0.3) 82%, transparent);
}
.dorm-cap {
  margin-top: 20px;
  font-size: 0.7rem; color: var(--muted); letter-spacing: 0.06em;
  text-align: center;
  max-width: 30em;
}
.iso-points { list-style: none; }
.iso-points li {
  position: relative;
  padding: 14px 0 14px 30px;
  font-size: 0.98rem;
}
.iso-points li::before {
  content: "▸";
  position: absolute; left: 2px; color: var(--lamp);
}
.iso-points code {
  font-size: 0.82em; color: var(--signal);
  background: rgba(91, 157, 255, 0.1);
  padding: 2px 6px; border-radius: 4px;
}

/* ---------- 03:50 跑马灯 ---------- */
.marquee {
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
.marquee-track {
  display: flex; white-space: nowrap;
  font-size: 0.74rem; letter-spacing: 0.28em;
  color: var(--muted);
  will-change: transform;
}
.marquee-track > span { flex-shrink: 0; }

/* ---------- 04:30 启动：命令直接写在夜上，只留一条琥珀左缘线 ---------- */
.codeblock {
  position: relative;
  border-left: 1px solid rgba(255, 180, 84, 0.5);
  padding: 10px 0 10px clamp(22px, 3.4vw, 40px);
}
.copy-btn {
  background: none; border: 1px solid var(--line);
  color: var(--muted); font-size: 0.68rem;
  padding: 4px 12px; border-radius: 4px; cursor: pointer;
  transition: color 0.25s var(--ease-premium), border-color 0.25s var(--ease-premium);
}
.copy-btn:hover { color: var(--paper); border-color: var(--muted); }
.copy-btn.copied { color: var(--done); border-color: var(--done); }
.codeblock .copy-btn { position: absolute; top: 2px; right: 0; }
.codeblock pre {
  overflow-x: auto;
  font-size: clamp(0.8rem, 1.1vw, 0.94rem); line-height: 2.4;
}
.c-prompt { color: var(--lamp); user-select: none; }
.c-comment { color: var(--muted); opacity: 0.7; }
.start-more { margin-top: 26px; color: var(--muted); font-size: 0.95rem; }
.start-more a { color: var(--signal); text-underline-offset: 4px; }

/* ---------- 06:00 天亮 ---------- */
.dawn { padding-bottom: clamp(60px, 8vh, 110px); }
.dawn-inner { text-align: center; }
.dawn-title {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 1.15;
  margin: 18px 0 22px;
  text-shadow: 0 0 60px rgba(255, 213, 142, 0.25);
}
.dawn-sub { color: var(--paper); opacity: 0.85; font-size: clamp(1rem, 1.6vw, 1.2rem); }
.dawn-cta { justify-content: center; margin-top: 40px; }

/* ---------- 页脚 ---------- */
.site-foot {
  padding: 40px 0 50px;
  background: linear-gradient(180deg, rgba(5, 10, 20, 0) 0%, rgba(5, 10, 20, 0.35) 100%);
}
.foot-inner { display: flex; flex-direction: column; gap: 16px; }
.foot-brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.82rem; font-weight: 500;
}
.foot-links { display: flex; gap: 22px; font-size: 0.82rem; }
.foot-links a { color: var(--paper); opacity: 0.8; text-decoration: none; }
.foot-links a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
.foot-note { font-size: 0.74rem; color: var(--paper); opacity: 0.6; max-width: 56em; }

/* 天亮后（滚动到底部附近）页脚换成墨色，保证亮色天空下的对比度 */
.site-foot, .foot-brand, .foot-links a, .foot-note, .dawn-sub, .btn-ghost {
  transition: color 0.6s var(--ease-premium), border-color 0.6s var(--ease-premium);
}
body.lit .site-foot { color: #3A2B1C; }
body.lit .foot-brand, body.lit .foot-links a, body.lit .foot-note { color: #3A2B1C; }
body.lit .foot-note { opacity: 0.78; }
body.lit .dawn-sub { color: #2E2436; opacity: 0.9; }
body.lit .dawn-title { color: #FFFFFF; }
body.lit .btn-ghost { border-color: rgba(58, 43, 28, 0.45); color: #3A2B1C; }

/* ---------- 动画初始态（仅 js-anim 下隐藏，CDN 失效时优雅降级） ---------- */
.js-anim [data-reveal] { opacity: 0; }
.js-anim [data-hero] { opacity: 0; }
.js-anim .strip b { opacity: 0; }
.js-anim .shift-done { opacity: 0; }
.js-anim .log-line { opacity: 0; }
.js-anim .shift-clear { opacity: 0; }
.js-anim .dorm-cap { opacity: 0; }
.js-anim .dorm-wrap { opacity: 0; }
@media (prefers-reduced-motion: reduce) {
  .js-anim [data-reveal], .js-anim [data-hero], .js-anim .strip b,
  .js-anim .shift-done, .js-anim .log-line, .js-anim .shift-clear,
  .js-anim .dorm-cap, .js-anim .dorm-wrap { opacity: 1; }
  .js-anim .shift-bar i, .js-anim .ticket-bar i, .js-anim .night-progress i,
  .js-anim .shift-thread i { transform: none; }
  .js-anim .win-you { animation: none; }
  /* 故事的最终状态：晚归的窗也熄了 */
  .win-late { background: #0A1322; box-shadow: none; }
  .js-anim .shift-node { background: var(--done); }
}

/* ---------- 夜 · 响应式 ---------- */
@media (max-width: 920px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-couplet { order: -1; margin-bottom: 8px; }
  .couplet-strips { gap: 16px; }
  .strip b { font-size: clamp(2.2rem, 9vw, 3rem); }
  .hero { padding-top: 100px; }
  .platform-grid { grid-template-columns: 1fr; gap: 56px; }
  .platform-grid::before { display: none; }
  .platform:nth-child(2) { margin-top: 0; }
  .shift { grid-template-columns: 1fr; }
  .shift-log { order: 2; padding-top: 10px; }
  .iso { grid-template-columns: 1fr; }
  .dorm-wrap { margin-bottom: 14px; }
  .hud-phase { display: none; }
  .scroll-cue { display: none; }
}
@media (max-width: 560px) {
  .shift-item { grid-template-columns: 48px 9px minmax(0, 1fr); column-gap: 12px; }
  .shift-thread { left: calc(48px + 12px + 4px); }
  .shift-item time { font-size: 0.68rem; }
  .hud-nav { gap: 12px; }
  .hud-link { font-size: 0.78rem; }
}

/* ============================================================
   昼 · 帮助文档（wiki.html）
   ============================================================ */

body.day {
  background: var(--day-bg);
  color: var(--day-ink);
}

/* 黎明色顶线：与展示页的夜呼应 */
.day-topline {
  height: 4px;
  background: linear-gradient(90deg, #27396B, #7A5170, #C76B5B, #F2A65A, #FFD58E);
}

.day-head {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(20px, 3vw, 36px);
  background: rgba(243, 247, 252, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--day-line);
}
.day-brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 0.95rem; text-decoration: none; color: var(--day-ink);
}
.day-brand .day-tag {
  font-size: 0.68rem; font-weight: 500; color: var(--day-muted);
  border: 1px solid var(--day-line); border-radius: 4px;
  padding: 2px 8px; letter-spacing: 0.12em;
}
.day-nav { display: flex; gap: 18px; align-items: center; }
.day-nav a {
  font-size: 0.85rem; color: var(--day-muted); text-decoration: none;
  transition: color 0.25s var(--ease-premium);
}
.day-nav a:hover { color: var(--day-ink); }
.day-nav .to-night { color: var(--brand); font-weight: 500; }

.wiki-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(28px, 4vh, 48px) clamp(20px, 4vw, 48px) 90px;
}

/* 侧栏 */
.wiki-side { position: sticky; top: 86px; align-self: start; }
.wiki-side-title {
  font-size: 0.7rem; color: var(--day-muted);
  letter-spacing: 0.22em; margin-bottom: 14px;
}
.wiki-toc { list-style: none; border-left: 1px solid var(--day-line); }
.wiki-toc li a {
  display: block;
  padding: 7px 0 7px 16px;
  margin-left: -1px;
  font-size: 0.86rem; color: var(--day-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.25s var(--ease-premium), border-color 0.25s var(--ease-premium);
}
.wiki-toc li.sub a { padding-left: 30px; font-size: 0.8rem; }
.wiki-toc li a:hover { color: var(--day-ink); }
.wiki-toc li a.active { color: var(--brand); border-left-color: var(--brand); font-weight: 500; }

/* 正文 */
.wiki-main { min-width: 0; }
.wiki-hero { margin-bottom: clamp(36px, 5vh, 56px); }
.wiki-kicker {
  font-size: 0.74rem; color: var(--brand); letter-spacing: 0.24em;
  margin-bottom: 14px;
}
.wiki-title {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(2rem, 4.4vw, 3rem);
  line-height: 1.25; margin-bottom: 14px;
}
.wiki-lede { color: var(--day-muted); font-size: 1.02rem; max-width: 40em; }

.wiki-sec { margin-bottom: clamp(48px, 7vh, 72px); scroll-margin-top: 96px; }
.wiki-sec > h2 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(1.4rem, 2.6vw, 1.8rem);
  padding-bottom: 12px; margin-bottom: 22px;
  border-bottom: 2px solid var(--day-ink);
}
.wiki-sec h3 {
  font-size: 1.08rem; font-weight: 700;
  margin: 30px 0 12px;
  scroll-margin-top: 96px;
}
.wiki-sec p { margin-bottom: 14px; color: var(--day-ink); }
.wiki-sec p.note { color: var(--day-muted); font-size: 0.9rem; }
.wiki-sec ul, .wiki-sec ol { margin: 0 0 16px 22px; }
.wiki-sec li { margin-bottom: 6px; }
.wiki-sec a { color: var(--brand); text-underline-offset: 3px; }
.wiki-sec code:not(pre code) {
  font-family: var(--mono); font-size: 0.85em;
  background: #E5EDF8; color: #1D4ED8;
  padding: 2px 7px; border-radius: 4px;
}

/* 代码块：文档里的「一小块夜」 */
.wiki-code {
  border-radius: 10px; overflow: hidden;
  margin: 18px 0 22px;
  border: 1px solid #1B2B4D;
}
.wiki-code-head {
  display: flex; justify-content: space-between; align-items: center;
  background: #0A1428; color: #8FA3C0;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.16em;
  padding: 8px 16px;
  border-bottom: 1px solid rgba(143, 163, 192, 0.18);
}
.wiki-code pre {
  background: var(--day-code); color: #DCE7F7;
  font-family: var(--mono); font-size: 0.83rem; line-height: 1.9;
  padding: 18px 20px; overflow-x: auto;
}
.wiki-code .c-comment { color: #6B7FA3; }
.wiki-code .c-prompt { color: var(--lamp); user-select: none; }
.wiki-code .copy-btn { border-color: rgba(143, 163, 192, 0.3); }

/* 表格 */
.wiki-table-wrap { overflow-x: auto; margin: 18px 0 22px; }
.wiki-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--day-card);
  border: 1px solid var(--day-line);
}
.wiki-table th {
  text-align: left; font-weight: 700;
  background: #EAF1FA;
  padding: 10px 14px;
  border-bottom: 2px solid var(--day-line);
  white-space: nowrap;
}
.wiki-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--day-line);
  vertical-align: top;
}
.wiki-table tr:last-child td { border-bottom: 0; }
.wiki-table code { font-family: var(--mono); font-size: 0.82em; color: #1D4ED8; }

/* 提示框 */
.callout {
  display: flex; gap: 12px;
  border-radius: 8px;
  padding: 14px 18px;
  margin: 18px 0 22px;
  font-size: 0.92rem;
}
.callout::before { font-family: var(--mono); font-weight: 500; }
.callout-info { background: #E8F0FE; border: 1px solid #C3D7F7; }
.callout-info::before { content: "ℹ"; color: var(--brand); }
.callout-warn { background: #FFF4E0; border: 1px solid #F3D9A8; }
.callout-warn::before { content: "⚠"; color: #B45309; }

/* FAQ */
.faq details {
  border: 1px solid var(--day-line);
  border-radius: 8px;
  background: var(--day-card);
  margin-bottom: 10px;
  overflow: hidden;
}
.faq summary {
  cursor: pointer;
  padding: 14px 18px;
  font-weight: 500; font-size: 0.95rem;
  list-style: none;
  position: relative;
  transition: background 0.25s var(--ease-premium);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute; right: 18px; top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono); color: var(--day-muted);
  transition: transform 0.3s var(--ease-premium);
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq summary:hover { background: #F0F5FC; }
.faq .faq-body { padding: 2px 18px 16px; color: var(--day-ink); font-size: 0.92rem; }
.faq .faq-body p { margin-bottom: 8px; }

/* 文档页脚 */
.day-foot {
  border-top: 1px solid var(--day-line);
  padding: 26px clamp(20px, 4vw, 48px) 40px;
  max-width: 1180px; margin: 0 auto;
  font-size: 0.78rem; color: var(--day-muted);
  display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between;
}
.day-foot a { color: var(--brand); }

/* ---------- 昼 · 响应式 ---------- */
@media (max-width: 880px) {
  .wiki-layout { grid-template-columns: 1fr; }
  .wiki-side {
    position: static;
    border: 1px solid var(--day-line); border-radius: 8px;
    background: var(--day-card);
    padding: 16px 18px;
  }
  .wiki-toc { border-left: 0; display: flex; flex-wrap: wrap; gap: 2px 18px; }
  .wiki-toc li a { padding: 5px 0; border-left: 0; }
  .wiki-toc li.sub { display: none; }
}