/* AIIC 2026 主论坛全记录：宣纸米黄底 + 深棕字 + 一处天蓝点缀（照 Glint 站的配色） */

@font-face { font-family: "WenKai"; font-display: swap; src: url("./fonts/wenkai.woff2") format("woff2"); }

:root {
  --paper: #f3ece0;
  --warm: #ebe1cf;
  --white: #fffdf8;
  --ink: #2b2521;
  --text: #2b2521;
  --text-2: #6d6158;
  --line: rgba(43, 37, 33, .13);
  --cyan: #1a9bd7;
  --cyan-ink: #0b78a8;
  --cyan-soft: rgba(26, 155, 215, .1);
  --radius: 18px;
  --bar-h: 60px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --serif: "WenKai", "LXGW WenKai", "Kaiti SC", "STKaiti", "KaiTi", var(--font);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--bar-h) + 64px); }
body { margin: 0; min-width: 320px; overflow-x: clip; background: var(--paper); color: var(--text); font-family: var(--font); line-height: 1.75; -webkit-font-smoothing: antialiased; }
h1, h2, h3, p, figure, blockquote { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; }
img { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 100; padding: 8px 12px; border-radius: 10px; background: var(--white); }
.skip:focus { top: 10px; }

/* —— 顶栏 —— */
.bar { position: sticky; top: 0; z-index: 30; background: rgba(243, 236, 224, .92); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid var(--line); }
.bar-in { max-width: 1240px; margin: 0 auto; height: var(--bar-h); padding: 0 24px; display: flex; align-items: center; gap: 20px; }
.brand { font-weight: 800; letter-spacing: .02em; white-space: nowrap; }
.brand span { font-weight: 500; color: var(--text-2); }
.tabs { display: flex; gap: 4px; margin: 0 auto; padding: 4px; border-radius: 999px; background: var(--warm); }
.tabs a { padding: 6px 16px; border-radius: 999px; font-size: 15px; color: var(--text-2); white-space: nowrap; transition: background .2s, color .2s; }
.tabs a[aria-selected="true"] { background: var(--ink); color: var(--paper); }
.join { padding: 8px 16px; border-radius: 999px; background: var(--cyan); color: #fff; font-weight: 600; font-size: 15px; white-space: nowrap; box-shadow: 0 6px 18px -8px rgba(26, 155, 215, .8); }
.join:hover { background: var(--cyan-ink); }

/* —— 首屏 —— */
.hero { position: relative; overflow: hidden; }
.hero-in { position: relative; z-index: 1; max-width: 1240px; margin: 0 auto; padding: 64px 24px 0; display: flex; align-items: flex-start; justify-content: space-between; gap: 40px; }
.hero h1 { font-family: var(--serif); font-size: clamp(36px, 5.6vw, 72px); line-height: 1.15; font-weight: 700; letter-spacing: .01em; }
.claim { margin-top: 20px; max-width: 34em; font-size: clamp(16px, 1.6vw, 20px); color: var(--text-2); }
.qr-card { flex: none; width: 236px; padding: 16px 16px 14px; border-radius: 22px; background: var(--white); border: 1px solid var(--line); box-shadow: 0 24px 50px -30px rgba(43, 37, 33, .45); text-align: center; transform: rotate(1.5deg); }
.qr-card img { width: 100%; height: auto; border-radius: 10px; }
.qr-txt { margin-top: 10px; display: grid; gap: 2px; }
.qr-txt strong { font-size: 15px; }
.qr-txt span { font-size: 13px; color: var(--cyan-ink); }
.hero-img { width: 100%; max-width: 1536px; height: auto; margin: 28px auto 0; aspect-ratio: 1536 / 610; object-fit: cover; -webkit-mask-image: linear-gradient(to bottom, #000 72%, transparent); mask-image: linear-gradient(to bottom, #000 72%, transparent); }

/* —— 主体布局 —— */
.layout { max-width: 1240px; margin: 0 auto; padding: 24px 24px 80px; display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 48px; }
.toc { position: sticky; top: calc(var(--bar-h) + 20px); align-self: start; max-height: calc(100vh - var(--bar-h) - 40px); overflow: auto; padding-right: 6px; font-size: 14px; }
.toc-part { margin: 18px 0 6px; font-weight: 700; color: var(--text); }
.toc-part:first-child { margin-top: 0; }
.toc a { display: block; padding: 5px 10px; margin-left: -10px; border-radius: 8px; color: var(--text-2); line-height: 1.45; }
.toc a:hover { background: var(--warm); color: var(--text); }
.toc a.on { background: var(--cyan-soft); color: var(--cyan-ink); }
.toc a small { display: block; font-size: 12px; opacity: .8; }

.pane[hidden], .toc[hidden] { display: none !important; }
.layout.no-toc { grid-template-columns: minmax(0, 1fr); }
.part-head { font-family: var(--serif); font-size: 30px; margin: 56px 0 18px; padding-top: 4px; }
.part-head:first-child { margin-top: 0; }

/* —— 概要卡片 —— */
.sec { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; margin-bottom: 22px; display: grid; grid-template-columns: minmax(0, 1fr) 210px; gap: 32px; }
.sec-main { min-width: 0; }
.sec-meta { font-size: 13px; color: var(--text-2); display: flex; gap: 10px; flex-wrap: wrap; }
.sec-meta .kind { color: var(--cyan-ink); font-weight: 600; }
.sec h2 { font-family: var(--serif); font-size: 26px; line-height: 1.35; margin: 6px 0 10px; }
.who { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 14px; color: var(--text-2); }
.who b { color: var(--text); font-weight: 650; }
.lead { margin-top: 16px; font-size: 17px; line-height: 1.8; }
.points { margin: 20px 0 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.points li { padding-top: 14px; border-top: 1px solid var(--line); }
.points li:first-child { padding-top: 0; border-top: 0; }
.points h3 { font-size: 16px; line-height: 1.5; }
.points h3 .sp { font-weight: 500; color: var(--cyan-ink); margin-right: 6px; }
.points p { font-size: 15px; color: #463c35; margin-top: 2px; }
.quotes { margin-top: 22px; display: grid; gap: 10px; }
.quotes blockquote { font-family: var(--serif); font-size: 18px; line-height: 1.6; padding: 14px 18px; border-radius: 12px; background: var(--paper); }
.quotes cite { display: block; margin-top: 4px; font-family: var(--font); font-style: normal; font-size: 13px; color: var(--text-2); }
.sec-card { align-self: start; position: sticky; top: calc(var(--bar-h) + 20px); }
.sec-card img { width: 100%; height: auto; border-radius: 12px; box-shadow: 0 16px 34px -22px rgba(43, 37, 33, .6); }
.sec-card a { display: block; }

/* —— 全文 —— */
.full-sec { margin-bottom: 48px; }
.full-sec h2 { font-family: var(--serif); font-size: 26px; line-height: 1.35; margin: 4px 0 6px; }
.full-sec .who { margin-bottom: 18px; }
.utt { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 16px; padding: 12px 0; border-top: 1px dashed var(--line); }
.utt .sp { font-weight: 700; font-size: 14px; line-height: 1.9; word-break: keep-all; }
.utt .sp.host { color: var(--text-2); font-weight: 500; }
.utt .sp.main { color: var(--cyan-ink); }
.utt p { font-size: 16px; line-height: 1.9; }
.utt.cont { border-top: 0; padding-top: 0; }
.utt.cont .sp { visibility: hidden; }

/* —— 金句卡与 PDF —— */
.pdf-box { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center; padding: 28px 32px; border-radius: var(--radius); background: var(--ink); color: var(--paper); margin-bottom: 28px; }
.pdf-box h2 { font-family: var(--serif); font-size: 28px; line-height: 1.3; }
.pdf-box p { color: #d9cdbb; margin-top: 4px; }
.btns { display: flex; gap: 10px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 999px; background: var(--cyan); color: #fff; font-weight: 600; white-space: nowrap; }
.btn.ghost { background: transparent; color: inherit; box-shadow: inset 0 0 0 1.5px currentColor; }
.btn:hover { filter: brightness(1.08); }
.pdf-frame { width: 100%; height: 78vh; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); margin-bottom: 40px; }
.cards-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; margin-bottom: 18px; }
.cards-head h2 { font-family: var(--serif); font-size: 30px; }
.cards-head .btn { background: var(--ink); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card { background: var(--white); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; display: flex; flex-direction: column; }
.card img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; background: var(--warm); }
.card-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px 12px; font-size: 14px; }
.card-foot span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-2); }
.card-foot a { flex: none; padding: 5px 12px; border-radius: 999px; background: var(--cyan-soft); color: var(--cyan-ink); font-weight: 600; font-size: 13px; }

/* —— 页脚 —— */
.foot { border-top: 1px solid var(--line); background: var(--warm); }
.foot-in { max-width: 1240px; margin: 0 auto; padding: 36px 24px calc(36px + env(safe-area-inset-bottom)); display: flex; align-items: center; gap: 22px; }
.foot img { width: 110px; height: 110px; border-radius: 10px; background: #fff; padding: 6px; }
.foot strong { font-size: 18px; }
.foot p { font-size: 13px; color: var(--text-2); margin-top: 4px; }

/* —— 进群面板（只在点按钮时出现） —— */
.sheet { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; }
.sheet[hidden] { display: none; }
.sheet-mask { position: absolute; inset: 0; background: rgba(43, 37, 33, .45); }
.sheet-box { position: relative; width: min(340px, calc(100vw - 32px)); padding: 26px 24px 22px; border-radius: 24px; background: var(--white); text-align: center; display: grid; gap: 6px; animation: pop .22s ease-out; }
.sheet-box img { width: 100%; height: auto; border-radius: 12px; margin-bottom: 8px; }
.sheet-box span { font-size: 14px; color: var(--text-2); }
.sheet-x { position: absolute; top: 8px; right: 10px; width: 36px; height: 36px; font-size: 26px; line-height: 1; color: var(--text-2); }
@keyframes pop { from { transform: translateY(12px) scale(.97); opacity: 0; } }

/* —— 平板 —— */
@media (max-width: 1100px) {
  .layout { grid-template-columns: 210px minmax(0, 1fr); gap: 32px; }
  .sec { grid-template-columns: 1fr; }
  .sec-card { position: static; max-width: 260px; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* —— 手机 —— */
@media (max-width: 760px) {
  :root { --bar-h: 104px; }
  html { scroll-padding-top: calc(var(--bar-h) + 54px); }
  .bar-in { height: auto; padding: 10px 16px 10px; flex-wrap: wrap; gap: 10px; }
  .brand { order: 1; }
  .join { order: 2; margin-left: auto; padding: 6px 14px; font-size: 14px; }
  .tabs { order: 3; width: 100%; margin: 0; }
  .tabs a { flex: 1; text-align: center; padding: 7px 4px; font-size: 14px; }
  .hero-in { flex-direction: column; padding: 32px 16px 0; gap: 22px; }
  .claim { margin-top: 12px; }
  .qr-card { width: 100%; display: flex; align-items: center; gap: 14px; padding: 12px; text-align: left; transform: none; border-radius: 18px; }
  .qr-card img { width: 112px; flex: none; }
  .qr-txt strong { font-size: 16px; }
  .hero-img { margin-top: 16px; aspect-ratio: 16 / 9; }
  .layout { display: block; padding: 0 16px 56px; }
  .toc { position: sticky; top: var(--bar-h); z-index: 20; max-height: none; margin: 0 -16px 16px; padding: 10px 16px; display: flex; gap: 8px; overflow-x: auto; scrollbar-width: none; background: rgba(243, 236, 224, .95); border-bottom: 1px solid var(--line); -webkit-overflow-scrolling: touch; }
  .toc::-webkit-scrollbar { display: none; }
  .toc-part { display: none; }
  .toc a { flex: none; margin: 0; padding: 5px 12px; border-radius: 999px; background: var(--white); border: 1px solid var(--line); white-space: nowrap; font-size: 13px; }
  .toc a small { display: none; }
  .part-head { font-size: 24px; margin: 36px 0 12px; }
  .sec { padding: 20px 18px; gap: 18px; border-radius: 16px; }
  .sec h2, .full-sec h2 { font-size: 22px; }
  .lead { font-size: 16px; }
  .quotes blockquote { font-size: 17px; }
  .sec-card { max-width: none; }
  .utt { grid-template-columns: 1fr; gap: 2px; padding: 12px 0; }
  .utt.cont .sp { display: none; }
  .utt p { font-size: 16px; }
  .pdf-box { grid-template-columns: 1fr; padding: 22px 20px; }
  .pdf-frame { display: none; }
  .cards-head { flex-direction: column; align-items: flex-start; }
  .grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .card-foot { flex-direction: column; align-items: stretch; padding: 8px; }
  .card-foot span { font-size: 12px; }
  .card-foot a { text-align: center; }
  .foot-in { padding: 28px 16px calc(28px + env(safe-area-inset-bottom)); gap: 14px; }
  .foot img { width: 92px; height: 92px; }
  .foot strong { font-size: 16px; }
}
@media (max-width: 380px) {
  .brand span { display: none; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }