/* ============================================================
   郸客松 · 主题5「未来共创空间」透明材质 × 光学装置
   深墨冷中性底 / 半透拱层 / 瓷青·月白·窑火暖 三束折射光
   ============================================================ */

:root {
  --ink-0: #060B10;   /* 页面底 */
  --ink-1: #0A121A;   /* 章节底 */
  --ink-2: #0E1922;   /* 面板底 */
  --glass: rgba(150, 200, 225, 0.055);
  --glass-strong: rgba(150, 200, 225, 0.09);
  --edge: rgba(160, 210, 235, 0.14);
  --edge-hi: rgba(160, 210, 235, 0.3);
  --text-hi: #E9F2F6;
  --text: #C3D3DC;
  --text-dim: #93A7B4;
  --cyan: #8FDFF2;    /* 瓷青 */
  --moon: #CFE9F4;    /* 月白 */
  --amber: #E8B878;   /* 窑火暖 */
  --serif: "Songti SC", "STSong", "Noto Serif SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --head-h: 64px;
  --measure: 38em;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(143, 223, 242, 0.07), transparent 62%),
    radial-gradient(900px 540px at 12% 110%, rgba(232, 184, 120, 0.045), transparent 60%),
    var(--ink-0);
  color: var(--text);
  font: 400 16px/1.8 var(--sans);
  letter-spacing: 0.01em;
}

h1, h2, h3 { color: var(--text-hi); font-weight: 600; letter-spacing: 0.04em; }
p { margin: 0 0 1em; }
a { color: var(--moon); text-decoration: none; }
a:hover { color: var(--cyan); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--ink-2); color: var(--text-hi);
  padding: 10px 18px; border: 1px solid var(--edge-hi); border-radius: 4px;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- 顶栏 ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6, 11, 16, 0.92);            /* 无 backdrop-filter 的回退底 */
  border-bottom: 1px solid var(--edge);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .site-head { background: rgba(6, 11, 16, 0.72); }
}
.head-inner {
  max-width: 1160px; margin: 0 auto; padding: 0 28px;
  height: var(--head-h);
  display: flex; align-items: center; gap: 26px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark { display: grid; place-items: center; width: 30px; height: 30px; }
.brand-text {
  color: var(--text-hi); font-size: 17px; letter-spacing: 0.12em; font-weight: 600;
  display: flex; flex-direction: column; line-height: 1.25;
}
.brand-text small {
  font-size: 10.5px; font-weight: 400; letter-spacing: 0.24em;
  color: var(--text-dim); font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
.head-nav {
  display: flex; gap: 4px; margin-left: auto;
  overflow-x: auto; scrollbar-width: none; -webkit-overflow-scrolling: touch;
}
.head-nav::-webkit-scrollbar { display: none; }
.head-nav a {
  padding: 9px 13px; border-radius: 4px; white-space: nowrap;
  font-size: 14.5px; color: var(--text-dim); border: 1px solid transparent;
  transition: color .25s, border-color .25s;
}
.head-nav a:hover { color: var(--text-hi); }
.head-cta { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.head-status {
  font-size: 14px; color: var(--text-dim); white-space: nowrap;
  display: inline-flex; align-items: center; gap: 8px;
}
.head-status::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--amber); box-shadow: 0 0 8px rgba(232, 184, 120, .7);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 4px;
  border: 1px solid var(--edge-hi);
  background: linear-gradient(160deg, rgba(143, 223, 242, 0.16), rgba(143, 223, 242, 0.05));
  color: var(--text-hi); font-size: 15.5px; letter-spacing: 0.06em;
  transition: border-color .25s, background .25s, transform .25s;
}
.btn:hover {
  color: #F4FBFE; border-color: rgba(143, 223, 242, 0.6);
  background: linear-gradient(160deg, rgba(143, 223, 242, 0.26), rgba(143, 223, 242, 0.09));
  transform: translateY(-1px);
}
.btn-ghost { background: transparent; }
.btn-mini { padding: 8px 16px; font-size: 14px; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  max-width: 1160px; margin: 0 auto; padding: 60px 28px 26px;
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 20px 36px; align-items: center;
  min-height: calc(100vh - var(--head-h) - 20px);
}
.hero-copy { position: relative; z-index: 2; max-width: 480px; }
.eyebrow {
  font-size: 14px; color: var(--cyan); letter-spacing: 0.28em;
  margin: 0 0 18px; display: flex; align-items: center; gap: 12px;
}
.eyebrow::after { content: ""; flex: 0 0 56px; height: 1px; background: linear-gradient(90deg, rgba(143,223,242,.55), transparent); }
.hero-title {
  font-size: clamp(64px, 10vw, 118px); font-weight: 200;
  letter-spacing: 0.18em; line-height: 1.04; margin: 0 0 10px;
  color: #F2F8FB;
  text-shadow: 0 0 42px rgba(143, 223, 242, 0.22);
}
.hero-slogan {
  font-family: var(--serif); font-size: clamp(24px, 3.8vw + 0.7rem, 40px);
  letter-spacing: 0.1em; color: var(--text-hi);
  margin: 0 0 22px; max-width: 15em;
}
.hero-lead { font-size: 16.5px; max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 26px 0 14px; }
.hero-note { font-size: 14px; color: var(--text-dim); }

.hero-stage { position: relative; z-index: 1; min-height: 420px; }
.installation {
  display: block; width: 100%; height: auto; max-height: calc(100vh - var(--head-h) - 40px);
  transform: translate3d(calc(var(--px, 0) * 7px), calc(var(--py, 0) * 5px + var(--sy, 0) * -0.1px), 0);
  will-change: transform;
}
.stage-caption {
  grid-column: 1 / -1; margin: 4px 0 0;
  font-size: 14px; color: var(--text-dim); text-align: center; letter-spacing: 0.06em;
}

/* ---------- 装置入场动画（from 隐藏、终态即静态默认） ---------- */
.a-arc    { animation: arcIn 1.15s cubic-bezier(.22,.75,.25,1) both; }
.a-kiln   { animation: arcIn .9s  cubic-bezier(.22,.75,.25,1) .62s both; }
.a-glow   { animation: fadeSlow 1.8s ease-out both; }
.a-reflect{ animation: fadeSlow 2s   ease-out .5s both; }
.a-prism  { animation: prismIn .9s  cubic-bezier(.2,.7,.2,1) .35s both; }
.a-beam   { animation: beamIn 1.05s cubic-bezier(.3,.6,.3,1) both; }
.beam-in .a-beam  { animation-delay: .12s; }
.beam-out .a-beam:nth-of-type(1) { animation-delay: .66s; }
.beam-out .a-beam:nth-of-type(2) { animation-delay: .78s; }
.beam-out .a-beam:nth-of-type(3) { animation-delay: .9s; }
.a-line   { stroke-dasharray: 520; animation: lineDraw 1.1s cubic-bezier(.35,.4,.3,1) both; }
.beam-in .a-line  { animation-delay: .18s; }
.beam-out .a-line { animation-delay: .74s; }
.a-mote   { animation: moteIn .9s ease-out both; }
.a-mote:nth-of-type(1) { animation-delay: .9s; }
.installation .a-mote:nth-of-type(2) { animation-delay: 1.05s; }

@keyframes arcIn    { from { opacity: 0; transform: translateY(26px); } }
@keyframes fadeSlow { from { opacity: 0; } }
@keyframes prismIn  { from { opacity: 0; transform: translateY(-14px); } }
@keyframes beamIn   { from { opacity: 0; } }
@keyframes lineDraw { from { stroke-dashoffset: 520; } }
@keyframes moteIn   { from { opacity: 0; } }

/* 滚动揭示：仅 html.js 下隐藏，无 JS / reduce 时默认可见 */
html.js [data-reveal] { opacity: 0; transform: translateY(18px); }
html.js [data-reveal].on {
  opacity: 1; transform: none;
  transition: opacity .7s ease, transform .7s cubic-bezier(.22,.75,.25,1);
}

/* ---------- 章节骨架 ---------- */
.sec { position: relative; padding: 104px 28px; scroll-margin-top: calc(var(--head-h) + 12px); }
.sec-alt { background: linear-gradient(180deg, rgba(10, 18, 26, 0), var(--ink-1) 18%, var(--ink-1) 82%, rgba(10, 18, 26, 0)); }
.sec > :nth-child(n) { max-width: 980px; margin-left: auto; margin-right: auto; }

/* 章间光带 */
.sec::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: min(680px, 78%); height: 1px;
  background: linear-gradient(90deg, transparent, rgba(143, 223, 242, 0.35), transparent);
}
.sec-head { margin-bottom: 46px; }
.kicker {
  font-size: 14px; color: var(--cyan); letter-spacing: 0.3em;
  margin: 0 0 14px; font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
.sec-head h2 {
  font-size: clamp(30px, 4.4vw, 46px); font-weight: 300; letter-spacing: 0.09em;
  margin: 0 0 18px; color: var(--text-hi);
}
.lede { font-size: 17px; max-width: var(--measure); color: var(--text); }
.lede::first-letter { letter-spacing: 0; }

/* ---------- 01 活动理解：错位三块 ---------- */
.u-grid {
  display: grid; grid-template-columns: repeat(12, 1fr);
  gap: 18px 22px;
}
.u-block {
  border: 1px solid var(--edge); border-radius: 8px;
  background: linear-gradient(165deg, var(--glass-strong), var(--glass) 55%, rgba(150,200,225,0.02));
  padding: 26px 28px;
  -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
  transition: border-color .3s;
}
.u-block:hover { border-color: var(--edge-hi); }
.u-block h3 { font-size: 19px; margin: 0 0 10px; letter-spacing: 0.08em; }
.u-block p { margin: 0; font-size: 15.5px; }
.u-block-a { grid-column: 1 / 6; }
.u-block-b { grid-column: 6 / 10; margin-top: 34px; }
.u-block-c { grid-column: 10 / 13; margin-top: 68px; }

.who {
  margin-top: 56px; padding-top: 26px;
  border-top: 1px dashed var(--edge);
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 18px;
}
.who-label { font-size: 14px; color: var(--text-dim); letter-spacing: 0.2em; margin: 0; }
.who-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.who-list li {
  font-size: 14.5px; padding: 6px 15px; border-radius: 999px;
  border: 1px solid var(--edge); color: var(--text); background: var(--glass);
}

/* ---------- 02 共创方向：三束折射光错落 ---------- */
.d-list { display: grid; gap: 26px; max-width: 860px; }
.d-item {
  position: relative; padding: 26px 30px 22px 34px;
  border: 1px solid var(--edge); border-left-width: 3px; border-radius: 6px;
  background: linear-gradient(120deg, var(--glass-strong), rgba(150,200,225,0.02) 70%);
  transition: border-color .3s, transform .3s;
}
.d-item:hover { transform: translateX(4px); }
.d-no {
  font-size: 14px; letter-spacing: 0.24em; margin: 0 0 8px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
.d-item h3 { font-size: 24px; margin: 0 0 10px; font-weight: 500; letter-spacing: 0.1em; }
.d-body { margin: 0 0 12px; max-width: 34em; }
.d-form { font-size: 14px; color: var(--text-dim); letter-spacing: 0.05em; margin: 0; }
.d-item-cyan  { border-left-color: var(--cyan);  margin-left: 0; }
.d-item-cyan .d-no, .d-item-cyan h3 { color: var(--cyan); }
.d-item-cyan h3 { color: #D9F4FA; }
.d-item-white { border-left-color: var(--moon); margin-left: 10%; }
.d-item-white .d-no { color: var(--moon); }
.d-item-white h3 { color: #F0F8FC; }
.d-item-amber { border-left-color: var(--amber); margin-left: 22%; }
.d-item-amber .d-no, .d-item-amber h3 { color: var(--amber); }
.d-item-amber h3 { color: #F6E3C4; }
.d-item-cyan .d-form::before, .d-item-white .d-form::before, .d-item-amber .d-form::before {
  content: "— "; color: var(--text-dim);
}

/* ---------- 03 在地线索：光脉纵列 ---------- */
.l-list {
  list-style: none; margin: 0 auto; padding: 6px 0 0; max-width: 720px;
  position: relative;
}
.l-list::before {
  content: ""; position: absolute; left: 7px; top: 10px; bottom: 10px; width: 1px;
  background: linear-gradient(180deg, rgba(143,223,242,.5), rgba(143,223,242,.08));
}
.l-item { position: relative; display: grid; grid-template-columns: 44px 1fr; }
.l-item + .l-item { margin-top: 40px; }
.l-dot {
  width: 15px; height: 15px; border-radius: 50%; margin-top: 9px;
  border: 1px solid rgba(143, 223, 242, 0.6);
  background: radial-gradient(circle, rgba(143,223,242,.9) 0 3px, rgba(6,11,16,.9) 3.5px);
  box-shadow: 0 0 10px rgba(143, 223, 242, 0.35);
}
.l-item h3 { font-size: 20px; margin: 0 0 8px; letter-spacing: 0.08em; }
.l-item p { margin: 0; max-width: 36em; }
.l-item:nth-child(3) .l-dot { border-color: rgba(232,184,120,.6); background: radial-gradient(circle, rgba(232,184,120,.85) 0 3px, rgba(6,11,16,.9) 3.5px); box-shadow: 0 0 10px rgba(232,184,120,.3); }
.l-note { margin-top: 46px; font-size: 14px; color: var(--text-dim); letter-spacing: 0.04em; }

/* ---------- 04 作品集：主/副不对称 ---------- */
.w-wrap { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 26px; }
.w-main, .w-side {
  border: 1px solid var(--edge); border-radius: 8px; padding: 30px 32px;
  background: linear-gradient(150deg, var(--glass-strong), rgba(150,200,225,0.015) 65%);
}
.w-main h3, .w-side h3 { font-size: 18px; margin: 0 0 14px; letter-spacing: 0.16em; color: var(--cyan); }
.w-main > p, .w-side > p { font-size: 15.5px; }
.w-list { list-style: none; margin: 18px 0 0; padding: 0; }
.w-list li { padding: 16px 0 14px; border-top: 1px dashed var(--edge); }
.w-list li:first-child { border-top: 0; }
.w-list a {
  display: inline-flex; align-items: baseline; gap: 10px;
  font-size: 18px; color: var(--text-hi); letter-spacing: 0.06em;
  border-bottom: 1px solid rgba(207, 233, 244, 0.35);
  padding-bottom: 3px; transition: color .25s, border-color .25s;
}
.w-list a:hover { color: var(--cyan); border-color: var(--cyan); }
.w-arrow { font-size: 15px; transition: transform .25s; color: var(--cyan); }
.w-list a:hover .w-arrow { transform: translateX(4px); }
.w-list p { margin: 8px 0 0; font-size: 14.5px; color: var(--text-dim); }

/* ---------- 05 合作 ---------- */
.p-list { list-style: none; margin: 0 auto; padding: 0; max-width: 780px; }
.p-list li {
  display: grid; grid-template-columns: 176px 1fr; gap: 18px; align-items: baseline;
  padding: 17px 6px; border-bottom: 1px solid rgba(160, 210, 235, 0.1);
}
.p-list li:first-child { border-top: 1px solid rgba(160, 210, 235, 0.1); }
.p-list strong { color: var(--text-hi); font-weight: 600; letter-spacing: 0.06em; }
.p-list span { font-size: 15px; color: var(--text-dim); }
.p-note {
  margin: 34px auto 0; max-width: 780px; padding: 18px 24px;
  border: 1px solid rgba(232, 184, 120, 0.32); border-radius: 8px;
  background: linear-gradient(150deg, rgba(232,184,120,0.07), transparent 70%);
}
.p-note p { margin: 0; font-size: 15px; }

/* ---------- 06 问答 ---------- */
.f-list { max-width: 780px; margin: 0 auto; }
.f-item { border-bottom: 1px solid rgba(160, 210, 235, 0.1); }
.f-item:first-child { border-top: 1px solid rgba(160, 210, 235, 0.1); }
.f-item summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 19px 6px; font-size: 16.5px; color: var(--text-hi); letter-spacing: 0.04em;
  transition: color .2s;
}
.f-item summary::-webkit-details-marker { display: none; }
.f-item summary:hover { color: var(--cyan); }
.f-item summary::after {
  content: "+"; font-weight: 300; font-size: 22px; color: var(--cyan);
  transition: transform .3s; flex-shrink: 0;
}
.f-item[open] summary::after { transform: rotate(45deg); }
.f-a { padding: 0 6px 20px; }
.f-a p { margin: 0; max-width: 40em; font-size: 15.5px; }

/* ---------- 07 联络：待公布光槽 ---------- */
.c-slots { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; max-width: 760px; }
.c-slot {
  border: 1px solid var(--edge); border-radius: 10px; padding: 30px 22px 24px;
  text-align: center; background: linear-gradient(170deg, var(--glass-strong), transparent 75%);
}
.c-frame {
  display: block; width: 132px; height: 132px; margin: 0 auto 18px;
  border: 1.5px dashed rgba(160, 210, 235, 0.34); border-radius: 8px;
  background:
    linear-gradient(135deg, transparent 46%, rgba(143,223,242,.07) 46% 54%, transparent 54%),
    radial-gradient(circle at 50% 42%, rgba(143,223,242,.06), transparent 65%);
}
.c-name { font-size: 16px; color: var(--text-hi); margin: 0 0 6px; letter-spacing: 0.1em; }
.c-status { font-size: 14px; color: var(--text-dim); margin: 0; letter-spacing: 0.12em; }

/* ---------- 页脚 ---------- */
.site-foot {
  border-top: 1px solid var(--edge);
  padding: 44px 28px 56px; text-align: center;
  background: linear-gradient(180deg, transparent, rgba(10, 18, 26, 0.8));
}
.site-foot p { margin: 0 0 6px; font-size: 15px; color: var(--text); letter-spacing: 0.08em; }
.foot-sub { font-size: 14px; color: var(--text-dim); }
.foot-sub a { color: var(--text-dim); border-bottom: 1px solid rgba(147,167,180,.4); }
.foot-sub a:hover { color: var(--cyan); border-color: var(--cyan); }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; padding-top: 34px; min-height: 0; }
  .hero-stage { order: 2; min-height: 0; }
  .hero-copy { order: 1; max-width: none; }
  .installation { max-height: none; }
  .stage-caption { order: 3; }
  .u-block-a { grid-column: 1 / 8; }
  .u-block-b { grid-column: 5 / 13; margin-top: 26px; }
  .u-block-c { grid-column: 2 / 9; margin-top: 26px; }
  .d-item-white { margin-left: 5%; }
  .d-item-amber { margin-left: 12%; }
  .w-wrap { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root { --head-h: 96px; } /* 顶栏两行后同步章节锚点偏移，标题不被遮挡 */
  body { font-size: 16px; }
  .head-inner { height: auto; flex-wrap: wrap; gap: 4px 12px; padding: 10px 16px 6px; }
  .head-cta .head-status { display: none; }   /* 状态在首屏 hero-note 有完整表达 */
  .head-cta { margin-left: auto; }
  /* 导航独立全宽第二行：品牌与合作按钮留首行；链接保持自然排布、可横滑 */
  .head-nav {
    order: 3; flex: 1 0 100%; margin-left: 0;
    -webkit-mask-image: linear-gradient(90deg, #000 88%, transparent);
    mask-image: linear-gradient(90deg, #000 88%, transparent);
  }
  .sec { padding: 76px 18px; }
  .hero { padding: 26px 18px 10px; }
  .hero-slogan { max-width: 13em; }
  .u-grid { grid-template-columns: 1fr; }
  .u-block-a, .u-block-b, .u-block-c { grid-column: auto; margin-top: 0; }
  .u-block { padding: 20px 20px; }
  .d-item { padding: 20px 18px 18px 22px; }
  .d-item-white, .d-item-amber { margin-left: 0; }
  .p-list li { grid-template-columns: 1fr; gap: 4px; }
  .c-slots { grid-template-columns: 1fr; justify-items: center; }
  .c-slot { width: 100%; max-width: 320px; }
  .l-item { grid-template-columns: 34px 1fr; }
  .hero-actions .btn { flex: 1 1 auto; text-align: center; }
}

/* ---------- 减少动态：回到静态终态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0s !important;
    transition-duration: 0.01ms !important;
  }
  .installation { transform: none; }
  .a-line { stroke-dasharray: none; }
  html.js [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- 无障碍：打印 ---------- */
@media print {
  .site-head, .hero-stage, .c-frame { display: none; }
  body { background: #fff; color: #111; }
}

/* ---------- 站点入口条（共创图景归档） ---------- */
.portal-back {
  display: flex; align-items: center; gap: 10px;
  padding: 9px max(calc((100vw - 1120px) / 2), 20px);
  background: var(--ink-1, #0A121A);
  border-bottom: 1px solid var(--edge, rgba(160, 210, 235, 0.14));
  font-size: 14px;
}
.portal-back a {
  color: var(--text-hi, #E9F2F6); text-decoration: none;
  border: 1px solid var(--edge-hi, rgba(160, 210, 235, 0.3));
  border-radius: 999px; padding: 4px 14px;
}
.portal-back a:hover { background: var(--cyan, #8FDFF2); border-color: var(--cyan, #8FDFF2); color: #060B10; }