/* ==========================================================
   展厅 · index.html 专用样式
   原则：作品脱框（无卡片、无圆角、无投影）
        一屏至多一处朱砂 · 纯 CSS，零依赖，移动端横向"展墙"
   ========================================================== */
:root {
  --paper: #faf9f7;
  --ink: #1b1a18;
  --ink-mid: #3c3934;
  --ink-soft: #6f6a63;
  --ink-faint: #a09a91;
  --hair: #ddd7cf;
  --accent: #9e2b25;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --pad-x: clamp(20px, 4vw, 56px);
}

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

body.hall {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}
body.hall img { display: block; max-width: 100%; }
body.hall a { color: inherit; text-decoration: none; }

.hall-wrap { max-width: 1240px; margin: 0 auto; padding: 0 var(--pad-x); }

/* ---------- 导航：入场时透明，滚过门厅后浮现 ---------- */
.nav--hall {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .5s var(--ease), border-color .5s var(--ease);
}
.nav--hall.is-scrolled {
  background: rgba(250, 249, 247, .92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--hair);
}
.nav--hall .nav-inner {
  max-width: 1240px; margin: 0 auto; padding: 0 var(--pad-x);
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav--hall .nav-brand {
  font-family: var(--serif); font-size: 19px; font-weight: 600; letter-spacing: .14em;
}
.nav--hall .nav-brand em { font-style: normal; color: var(--accent); }
.nav--hall .nav-links { display: flex; gap: 30px; font-size: 14px; letter-spacing: .08em; }
.nav--hall .nav-links a { position: relative; color: var(--ink-soft); padding: 4px 0; transition: color .3s; }
.nav--hall .nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: left;
  transition: transform .35s var(--ease);
}
.nav--hall .nav-links a:hover, .nav--hall .nav-links a.on { color: var(--ink); }
.nav--hall .nav-links a:hover::after, .nav--hall .nav-links a.on::after { transform: scaleX(1); }
.nav--hall .nav-toggle {
  display: none; background: none; border: none;
  font-size: 20px; line-height: 1; padding: 8px 10px;
  cursor: pointer; color: var(--ink);
}

/* ---------- 门厅：竖排题名 ---------- */
.gate {
  min-height: 100svh; position: relative;
  display: flex; align-items: center; justify-content: center;
  padding: 110px 20px 110px;
}
.gate-eyebrow {
  position: absolute; top: clamp(88px, 13vh, 140px); left: 50%;
  transform: translateX(-50%);
  font-family: var(--serif); font-size: 12px; letter-spacing: .55em; text-indent: .55em;
  color: var(--ink-faint); white-space: nowrap;
}
.gate-line { writing-mode: vertical-rl; position: relative; }
.gate-line > * { display: block; }
.gate-title {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(44px, 8.5vw, 92px);
  line-height: 1.55; letter-spacing: .18em; margin: 0;
}
.gate-title span { display: block; }
.gate-names {
  font-family: var(--serif); font-size: clamp(12px, 1.4vw, 15px);
  letter-spacing: .5em; line-height: 2.4; color: var(--ink-soft);
  padding-top: .5em;
}
.gate-seal {
  position: absolute; left: 0; bottom: 0;
  width: clamp(26px, 3vw, 34px); height: clamp(26px, 3vw, 34px);
  background: var(--accent); color: #faf6f0;
  font-family: var(--serif); font-size: clamp(15px, 1.7vw, 19px);
  line-height: 1; letter-spacing: 0; text-indent: 0;
  display: flex; align-items: center; justify-content: center;
}
.gate-cue {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.cue-line {
  width: 1px; height: 52px; background: var(--ink-faint);
  animation: cue 2.8s var(--ease) infinite;
}
@keyframes cue {
  0%   { transform: scaleY(0); transform-origin: top; }
  45%  { transform: scaleY(1); transform-origin: top; }
  55%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}
.cue-word {
  font-family: var(--serif); font-size: 12px;
  letter-spacing: .5em; text-indent: .5em; color: var(--ink-faint);
}

/* ---------- 题识 ---------- */
.colophon { padding: clamp(80px, 13vh, 150px) 0 0; }
.colo-quote {
  font-family: var(--serif); font-size: clamp(19px, 2.4vw, 26px);
  line-height: 2.2; letter-spacing: .06em; max-width: 36em;
}
.colo-stats {
  display: flex; flex-wrap: wrap; gap: clamp(36px, 7vw, 96px);
  margin-top: clamp(44px, 8vh, 78px);
  border-top: 1px solid var(--hair); padding-top: 36px;
}
.colo-stat b {
  display: block; font-family: var(--serif); font-weight: 300;
  font-size: clamp(44px, 6vw, 74px); line-height: 1.1;
  font-feature-settings: "tnum";
}
.colo-stat b i {
  font-style: normal; font-weight: 400;
  font-size: .3em; letter-spacing: .25em; color: var(--ink-soft);
  margin-left: .4em;
}
.colo-stat span {
  display: block; margin-top: 10px;
  font-size: 12px; letter-spacing: .32em; color: var(--ink-faint);
}

/* ---------- 两厅 ---------- */
.halls { padding-bottom: 0; }
.wing {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
  gap: clamp(40px, 6vw, 90px); align-items: center;
  padding: clamp(70px, 11vh, 120px) 0;
}
.wing + .wing { border-top: 1px solid var(--hair); }
.wing--flip { grid-template-columns: minmax(0, 4fr) minmax(0, 5fr); }
.wing--flip .hall-fig { order: 2; }
.hall-fig { margin: 0; }
.hall-fig img {
  max-height: min(74vh, 640px); width: auto; max-width: 100%;
  margin-inline: auto;
  outline: 1px solid rgba(27, 26, 24, .06); outline-offset: -1px;
}
.hall-num {
  font-family: var(--serif); font-size: 13px;
  letter-spacing: .6em; color: var(--ink-faint);
}
.hall-name {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(34px, 4.6vw, 52px); letter-spacing: .3em;
  margin: .3em 0 0;
}
.hall-role { margin-top: 14px; font-size: 13px; letter-spacing: .12em; color: var(--ink-soft); }
.hall-bio {
  margin-top: 20px; font-family: var(--serif); font-size: 16px;
  line-height: 2.15; color: var(--ink-mid); max-width: 30em;
}
.hall-meta {
  margin-top: 24px; font-size: 12.5px; letter-spacing: .18em;
  color: var(--ink-faint); font-feature-settings: "tnum";
}
.hall-go {
  display: inline-block; margin-top: 28px;
  font-family: var(--serif); font-size: 15px;
  letter-spacing: .5em; text-indent: .5em; color: var(--ink);
  border-bottom: 1px solid var(--ink); padding-bottom: 8px;
  transition: color .3s, border-color .3s;
}
.hall-go:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- 时间走廊 ---------- */
.corridor { padding-top: clamp(80px, 12vh, 140px); }
.corridor-head { margin-bottom: clamp(40px, 6vh, 64px); }
.ch-eyebrow {
  font-family: var(--serif); font-size: 14px;
  letter-spacing: .5em; color: var(--ink);
}
.ch-sub { margin-top: 12px; font-size: 13px; letter-spacing: .1em; color: var(--ink-faint); }
.ch-sub a { color: var(--ink-soft); border-bottom: 1px solid var(--hair); transition: color .3s, border-color .3s; }
.ch-sub a:hover { color: var(--accent); border-color: var(--accent); }

.era {
  display: grid; grid-template-columns: 250px minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  padding: clamp(48px, 7vh, 72px) 0;
  border-top: 1px solid var(--hair);
}
.era-head { position: sticky; top: 96px; align-self: start; }
.era-years {
  font-family: var(--serif); font-weight: 300;
  font-size: clamp(26px, 2.6vw, 38px); line-height: 1;
  letter-spacing: .04em; font-feature-settings: "tnum"; white-space: nowrap;
}
.era-label { margin-top: 14px; font-size: 12px; letter-spacing: .5em; color: var(--accent); }
.era-note {
  font-family: var(--serif); font-size: 15.5px; line-height: 2.1;
  color: var(--ink-mid); max-width: 36em; margin-bottom: 28px;
}

/* 展墙：画贴纸面，无框；底下一行小展签 */
.wall { display: flex; flex-wrap: wrap; gap: 18px 20px; align-items: center; }
.wall figure { margin: 0; display: inline-flex; flex-direction: column; }
.wall img {
  height: clamp(150px, 16.5vw, 225px); width: auto; max-width: 100%;
  outline: 1px solid rgba(27, 26, 24, .07); outline-offset: -1px;
}
.wall figcaption {
  width: 0; min-width: 100%;
  margin-top: 9px;
  font-size: 11.5px; line-height: 1.7; letter-spacing: .05em;
  color: var(--ink-faint);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.wall figcaption .dot {
  display: inline-block; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); margin-left: 6px; vertical-align: 2px;
}

/* ---------- 尾厅 ---------- */
.coda {
  border-top: 1px solid var(--hair);
  padding: clamp(90px, 14vh, 150px) 0 clamp(80px, 12vh, 120px);
  text-align: center;
}
.coda-line {
  font-family: var(--serif); font-size: clamp(19px, 2.4vw, 25px);
  letter-spacing: .1em;
}
.coda-link {
  display: inline-block; margin-top: 34px;
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(24px, 3vw, 34px); letter-spacing: .3em;
  border-bottom: 1px solid var(--accent); padding-bottom: 12px;
  transition: color .3s;
}
.coda-link:hover { color: var(--accent); }
.coda-note { margin-top: 28px; font-size: 12px; letter-spacing: .22em; color: var(--ink-faint); }

/* ---------- 页脚 ---------- */
.footer--hall {
  border-top: 1px solid var(--hair);
  padding: 46px 0 56px; text-align: center;
  color: var(--ink-faint); font-size: 12.5px; letter-spacing: .14em;
}
.footer--hall b {
  display: block; margin-bottom: 10px;
  font-family: var(--serif); font-weight: 600;
  letter-spacing: .3em; color: var(--ink-soft);
}

/* ---------- 渐显 ---------- */
.rv {
  opacity: 0; transform: translateY(18px);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
  transition-delay: var(--d, 0s);
}
.rv.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .nav--hall .nav-toggle { display: block; }
  .nav--hall .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--hair);
    box-shadow: 0 12px 24px rgba(0, 0, 0, .06);
  }
  .nav--hall .nav-links.open { display: flex; }
  .nav--hall .nav-links a { padding: 14px var(--pad-x); border-top: 1px solid var(--hair); }
  .nav--hall .nav-links a::after { display: none; }
  .nav--hall .nav-links a.on { background: rgba(158, 43, 37, .05); }

  .gate { padding: 96px 16px 96px; }
  .wing, .wing--flip { grid-template-columns: 1fr; gap: 32px; }
  .wing--flip .hall-fig { order: 0; }
  .wing { padding: 56px 0; }
  .hall-fig img { max-height: 60vh; }

  .era { grid-template-columns: 1fr; gap: 20px; padding: 44px 0; }
  .era-head { position: static; display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
  .era-label { margin-top: 0; }

  /* 手机端：展墙改为横向推移，像沿墙行走 */
  .wall {
    flex-wrap: nowrap; overflow-x: auto;
    margin: 0 calc(-1 * var(--pad-x)); padding: 0 var(--pad-x) 12px;
    scroll-snap-type: x proximity;
    scrollbar-width: none; -webkit-overflow-scrolling: touch;
  }
  .wall::-webkit-scrollbar { display: none; }
  .wall figure { flex: 0 0 auto; scroll-snap-align: start; }
  .wall img { height: 46vw; max-height: 300px; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  .cue-line { animation: none; }
  html { scroll-behavior: auto; }
}