/* =========================================================
   首页专属：舞台 / 关键词条 / 项目（AI Core + 卡片）/ 关于 / 焊缝 / 研究 / 经历 / 联系
   颜色、字号、圆角、缓动全部来自 style.css 的 tokens。
   ========================================================= */

/* =========================================================
   舞台（首屏）
   结构：顶部两角信息 → 3D 主角（右侧）→ 左下大字姓名 + 标语 → 底部 HUD 读数
   ========================================================= */
.stage {
  position: relative; isolation: isolate; overflow: hidden;
  min-height: max(700px, 100svh); display: flex; flex-direction: column;
  padding: calc(var(--nav-h) + clamp(1.5rem, 4vh, 3rem)) var(--gutter) 0;
  background: var(--bg);
}
.stage__sky, .stage__bg, .stage__grid { position: absolute; inset: 0; }
.stage__sky { z-index: 0; opacity: 0; transition: opacity .8s; }
html:not([data-theme="dark"]) .stage__sky {
  opacity: 1;
  background:
    radial-gradient(60% 40% at 30% 25%, rgba(255,255,255,.9), transparent 70%),
    radial-gradient(50% 35% at 75% 70%, rgba(255,255,255,.75), transparent 70%),
    radial-gradient(40% 30% at 62% 18%, rgba(255,250,238,.7), transparent 70%),
    linear-gradient(180deg, #a8ccef 0%, #bdd8f3 55%, var(--bg) 100%);
}
.stage__bg { z-index: 1; display: block; filter: saturate(.55); }
/* 暗角：让左侧文字始终压得住背景 */
.stage::after {
  content: ""; position: absolute; inset: 0; z-index: 2; pointer-events: none;
  background:
    linear-gradient(90deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 55%, transparent) 38%, transparent 70%),
    linear-gradient(0deg, var(--bg) 0%, transparent 28%);
  opacity: .7;
}

/* 3×3 网格线 + 交点十字：装置感的来源，压得很淡 */
.stage__grid { z-index: 3; pointer-events: none; display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); margin: 0 var(--gutter); opacity: .5; }
.stage__grid i { position: relative; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stage__grid i:nth-child(3n) { border-right: 0; }
.stage__grid i:nth-child(n+7) { border-bottom: 0; }
.stage__grid i::after { content: ""; position: absolute; right: -5px; bottom: -5px; width: 9px; height: 9px;
  background: linear-gradient(var(--line-strong), var(--line-strong)) center / 1px 100% no-repeat, linear-gradient(var(--line-strong), var(--line-strong)) center / 100% 1px no-repeat; }
.stage__grid i:nth-child(3n)::after, .stage__grid i:nth-child(n+7)::after { display: none; }
.stage__grid::before, .stage__grid::after { content: ""; position: absolute; top: 0; bottom: 0; width: 1px; background: var(--line); left: 0; }
.stage__grid::after { left: auto; right: 0; }

.stage__scene { position: absolute; z-index: 2; top: calc(var(--nav-h) + 7rem); right: 0; bottom: 4rem; left: 40%; transform: translateY(var(--scene-shift, 0px)); }
.stage__canvas { position: absolute; inset: 0; width: 100% !important; height: 100% !important; display: block; }
/* 不加载 3D 时：一团柔光代替玻璃字 */
.stage.no-3d .stage__scene::before {
  content: ""; position: absolute; left: 50%; top: 45%; width: min(60vw, 520px); aspect-ratio: 1; transform: translate(-50%, -50%);
  border-radius: 50%; pointer-events: none; filter: blur(24px);
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 30%, transparent), transparent 72%);
}
.stage.no-3d [data-greet] { display: none !important; }

.stage__top, .stage__main, .stage__hud { position: relative; z-index: 4; }
.stage__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; }
.stage__tagline {
  display: flex; align-items: center; gap: .75rem;
  font-family: var(--font-mono); font-size: 12px; line-height: 1.6; letter-spacing: .12em; text-transform: uppercase; color: var(--ink);
}
.stage__tagline [lang="zh-CN"] { letter-spacing: .06em; }
.stage__tagline::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft), 0 0 18px var(--accent); flex: none; animation: pulse 2.8s ease-out infinite; }
.stage__credential { margin: .35rem 0 0 calc(7px + .75rem); font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.stage__credential [lang="zh-CN"] { letter-spacing: .04em; }
.stage__tr { width: min(28vw, 360px); }
.stage__bio { font-size: 14.5px; line-height: 1.75; color: var(--ink-2); text-wrap: pretty; }
.stage__links { margin-top: 1.25rem; display: flex; flex-wrap: wrap; gap: .5rem; }
.stage__links a {
  display: inline-flex; align-items: center; gap: .4em; height: 32px; padding: 0 .85rem; border-radius: var(--r-pill);
  border: 1px solid var(--line-2); background: color-mix(in srgb, var(--bg) 40%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2);
  transition: color .2s, border-color .2s, background .2s;
}
.stage__links a [lang="zh-CN"] { letter-spacing: .04em; }
.stage__links a:hover { text-decoration: none; color: var(--ink); border-color: var(--line-strong); }
.stage__links a:first-child { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.stage__links a:first-child:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.stage__links a[href^="mailto"] { text-transform: none; letter-spacing: .02em; }

.stage__main { margin-top: auto; padding-bottom: clamp(1.75rem, 4vh, 2.75rem); max-width: 60%; }
.stage__name {
  display: flex; flex-direction: column; margin: 0 0 1.25rem -.05em;
  font-family: var(--font-sans); font-size: var(--fs-display); font-weight: 500; line-height: .9; letter-spacing: -0.07em; color: var(--ink);
}
.stage__line { display: block; overflow: hidden; padding-block: .04em; }
.stage__line > span { display: block; transform: translateY(110%); animation: rise 1.1s var(--ease-out) forwards; }
.stage__line:nth-child(2) > span { animation-delay: .1s; }
@keyframes rise { to { transform: none; } }
.stage__name-dot { color: var(--accent); }
.stage__purpose {
  font-size: clamp(20px, 2.1vw, 30px); line-height: 1.3; letter-spacing: -0.03em; color: var(--ink);
  opacity: 0; animation: purposein 1s var(--ease-out) .45s forwards;
}
.stage__purpose [lang="zh-CN"] { letter-spacing: -0.005em; font-weight: 500; }
@keyframes purposein { from { opacity: 0; transform: translateY(12px); filter: blur(4px); } to { opacity: 1; transform: none; filter: none; } }

/* 碰一下打招呼：贴在 3D 字下方 */
.stage__greet {
  position: absolute; z-index: 5; right: calc(var(--gutter) + 12%); bottom: 22%;
  display: inline-flex; align-items: center; gap: .6rem; height: 40px; padding: 0 1rem 0 .8rem; cursor: pointer;
  border: 1px solid var(--line-2); border-radius: var(--r-pill); color: var(--ink-2);
  background: color-mix(in srgb, var(--bg) 60%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase;
  transition: color .2s, border-color .25s, background .25s, transform .5s var(--ease-spring);
}
.stage__greet [lang="zh-CN"] { letter-spacing: .04em; }
.stage__greet:hover, .stage__greet:focus-visible { color: var(--ink); border-color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }
.stage__greet-icon { color: var(--accent); font-size: 18px; line-height: 1; transition: rotate .9s var(--ease-out); }
.stage__greet:hover .stage__greet-icon { rotate: 180deg; }
.stage.is-greeting .stage__greet-icon { animation: spin 1.8s var(--ease-out); }
@keyframes spin { to { rotate: 360deg; } }

/* 底部 HUD：只在舞台里；时钟 / 鼠标坐标 / 向下 */
.stage__hud {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem;
  margin: 0 calc(-1 * var(--gutter)); padding: 1rem var(--gutter) 1.1rem; border-top: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.stage__hud .hud__coords { text-align: center; color: var(--ink-4); }
.stage__hud .hud__clock { color: var(--ink-2); display: inline-flex; align-items: center; gap: .6em; }
.stage__hud .hud__clock::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
.stage__explore { justify-self: end; display: inline-flex; align-items: center; gap: .75rem; color: var(--ink-2); }
.stage__explore [lang="zh-CN"] { letter-spacing: .04em; }
.stage__explore:hover { text-decoration: none; color: var(--ink); }
.stage__explore b { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid var(--line-2); border-radius: 50%; font-weight: 400; overflow: hidden; }
.stage__explore b::before { content: "↓"; animation: nudge 2.4s var(--ease-out) infinite; }
.stage__explore:hover b { border-color: var(--ink); }
@keyframes nudge { 0%, 20% { transform: translateY(-120%); } 45%, 75% { transform: none; } 100% { transform: translateY(120%); } }

@media (max-width: 1100px) {
  .stage__main { max-width: 70%; }
  .stage__scene { left: 34%; }
}
@media (max-width: 760px) {
  .stage { min-height: 100svh; padding-top: calc(var(--nav-h) + .5rem); }
  .stage::after { background: linear-gradient(0deg, var(--bg) 0%, transparent 35%); opacity: .9; }
  .stage__top { display: contents; }
  .stage__tl, .stage__tr { position: relative; z-index: 4; }
  .stage__tl { order: 1; }
  /* 3D 区压矮一点，把介绍和按钮留在首屏里 */
  .stage__scene { order: 2; position: relative; inset: auto; height: min(24vh, 210px); margin: .25rem calc(-1 * var(--gutter)) -.5rem; transform: none; }
  .stage__main { order: 3; max-width: none; margin-top: 0; padding-bottom: 1.25rem; }
  .stage__name { font-size: clamp(56px, 16vw, 96px); margin-bottom: .75rem; }
  .stage__purpose { font-size: 19px; }
  .stage__tr { order: 4; width: auto; padding-bottom: 1.5rem; }
  .stage__bio { font-size: 14.5px; line-height: 1.7; }
  .stage__links { margin-top: 1rem; }
  .stage__greet { position: absolute; right: var(--gutter); bottom: auto; top: calc(var(--nav-h) + 4.5rem); height: 34px; font-size: 10.5px; }
  .stage__hud { order: 5; margin-top: auto; grid-template-columns: 1fr auto; }
  .stage__hud .hud__coords { display: none; }
  .stage__grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- 关键词条 ---------- */
.marquee {
  display: block; overflow: hidden; padding: 1.4rem 0; border-bottom: 1px solid var(--line);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.marquee__track {
  display: inline-flex; gap: 2.5rem; white-space: nowrap; will-change: transform;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3);
  animation: marquee 60s linear infinite;
}
.marquee__track span:nth-child(even) { color: var(--accent); }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* =========================================================
   项目
   ========================================================= */
/* ---------- AI Core：陈列柜式的交互展品 ---------- */
.core-case {
  --core-signal: var(--ex-accent);
  position: relative; margin: 0 0 clamp(3.5rem, 6vw, 5rem); overflow: hidden; scroll-margin-top: 90px;
  border: 1px solid var(--ex-line-2); border-radius: var(--r-lg); background: var(--ex-bg); color: var(--ex-ink);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,.05);
}
.core-case::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(60% 50% at 50% 60%, rgba(143,191,255,.07), transparent 70%); }
.core-case__header { position: relative; padding: clamp(1.75rem, 3.5vw, 2.75rem) clamp(1.5rem, 3.5vw, 2.75rem) 1.75rem; display: flex; justify-content: space-between; gap: 2rem; align-items: flex-end; }
.core-case__eyebrow, .core-label { margin: 0; font: 11px/1.6 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; }
.core-case__eyebrow { color: var(--ex-ink-2); display: flex; gap: .7rem; align-items: center; margin-bottom: 1.5rem; }
.core-case__eyebrow [lang="zh-CN"] { letter-spacing: .06em; }
.core-case__live { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--core-signal); box-shadow: 0 0 12px rgba(143,191,255,.5); flex-shrink: 0; animation: pulse 2.6s ease-out infinite; }
.core-case h3 { display: flex; gap: .15em; align-items: flex-start; margin: 0; font: 500 clamp(60px, 8.4vw, 124px)/.9 var(--font-sans); letter-spacing: -0.075em; }
.core-case h3 > span { color: var(--core-signal); font-size: .4em; line-height: 1.1; font-weight: 400; letter-spacing: 0; display: inline-block; animation: spin 24s linear infinite; }
.core-case__intro { max-width: 360px; padding-bottom: .5rem; }
.core-case__lead { font-size: clamp(21px, 2.1vw, 28px); line-height: 1.35; letter-spacing: -0.03em; margin: 0 0 .75rem; }
.core-case__lead [lang="zh-CN"] { letter-spacing: -0.005em; }
.core-case__description { color: var(--ex-ink-2); font-size: 13.5px; line-height: 1.8; margin: 0; }
.core-lab {
  position: relative; display: grid; grid-template-columns: 1fr 1.2fr 1fr; align-items: center; gap: 1.5rem;
  padding: 2rem clamp(1.5rem, 3.5vw, 2.75rem) 3rem; border-top: 1px solid var(--ex-line);
  background-image: radial-gradient(rgba(178,196,211,.12) .7px, transparent .8px); background-size: 20px 20px;
}
.core-input { z-index: 1; min-width: 0; }
.core-input .core-label { color: var(--ex-ink-3); }
.core-input__quote { display: block; color: var(--core-signal); font: 64px/.8 Georgia, serif; height: 38px; margin-top: 1.5rem; }
.core-input__question { font-size: clamp(20px, 2.1vw, 28px); line-height: 1.45; letter-spacing: -0.03em; margin: 0 0 1.1rem; }
.core-input__question [lang="zh-CN"] { letter-spacing: -0.005em; }
.core-input__context { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; font: 11px var(--font-mono); letter-spacing: .06em; color: var(--ex-ink-2); }
.core-input__context i { width: 3px; height: 3px; background: var(--ex-ink-3); border-radius: 50%; }
.core-play {
  display: inline-flex; align-items: center; gap: .75rem; margin-top: 1.75rem; padding: .7rem 1.1rem .7rem .75rem; cursor: pointer;
  color: var(--ex-bg); background: var(--core-signal); border: 1px solid var(--core-signal); border-radius: var(--r-pill);
  font: 500 13px var(--font-sans); transition: background .2s, transform .4s var(--ease-spring), box-shadow .3s;
}
.core-play:hover { background: #c4dcff; transform: translateY(-2px); box-shadow: 0 12px 30px -10px rgba(143,191,255,.6); }
.core-play__icon { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: rgba(12,15,21,.12); font-size: 15px; line-height: 1; }
.core-case.is-running .core-play__icon { animation: spin 1.2s linear infinite; }
.core-input__note { font: 11px/1.6 var(--font-mono); letter-spacing: .06em; color: var(--ex-ink-3); margin: .9rem 0 0; }
.core-reactor { position: relative; width: 100%; aspect-ratio: 1; display: grid; place-items: center; isolation: isolate; }
.core-reactor__axis { position: absolute; background: rgba(142,167,189,.13); }
.core-reactor__axis--h { height: 1px; width: 115%; top: 50%; }
.core-reactor__axis--v { width: 1px; height: 105%; left: 50%; }
.core-reactor__ticks { position: absolute; inset: 0; width: 100%; height: 100%; color: #56697a; animation: core-turn 100s linear infinite; }
.core-reactor__orbit { position: absolute; border: 1px solid rgba(131,151,164,.26); border-radius: 50%; }
.core-reactor__orbit--outer { inset: 0; animation: core-turn 24s linear infinite; }
.core-reactor__orbit--outer::before { content: ""; position: absolute; width: 7px; height: 7px; background: var(--core-signal); border-radius: 50%; left: 50%; top: -4px; box-shadow: 0 0 18px rgba(143,191,255,.8); }
.core-reactor__orbit--inner { inset: 21%; border-color: rgba(179,208,227,.4); box-shadow: 0 0 45px rgba(153,184,222,.05), inset 0 0 40px rgba(153,184,222,.08); }
.core-reactor__heart {
  position: relative; width: 47%; aspect-ratio: 1; border-radius: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 35% 20%, #2d3d4d, #151e28 55%, #0e141b); border: 1px solid rgba(149,170,183,.3);
  box-shadow: 0 16px 60px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.08);
}
.core-reactor__mark { font-size: clamp(30px, 4.2vw, 60px); color: var(--core-signal); line-height: 1; transition: transform .8s var(--ease-spring); transform: rotate(calc(var(--core-index, 0) * 90deg)); }
.core-reactor__heart strong { font: 500 13px var(--font-mono); letter-spacing: .26em; margin: .6rem 0 .35rem .26em; }
.core-reactor__heart > span:last-child { font: 10px var(--font-mono); letter-spacing: .08em; color: var(--ex-ink-2); }
.core-reactor__coordinate { position: absolute; left: 0; top: 0; color: var(--ex-ink-3); font: 10px var(--font-mono); letter-spacing: .1em; }
.core-reactor__coordinate--end { left: auto; top: auto; bottom: 0; right: 0; }
.core-reactor__caption { position: absolute; bottom: -1.75rem; display: flex; align-items: center; gap: .5rem; color: var(--ex-ink-2); font: 10.5px var(--font-mono); letter-spacing: .08em; white-space: nowrap; }
.core-case:not(.is-in-view) .core-reactor__ticks, .core-case:not(.is-in-view) .core-reactor__orbit--outer { animation-play-state: paused; }
.core-case.is-running .core-reactor__ticks { animation-duration: 10s; }
.core-case.is-running .core-reactor__orbit--outer { animation-duration: 5s; }
/* 输出卡片：一张被递出来的纸 */
.core-output {
  z-index: 1; min-height: 296px; display: flex; flex-direction: column; padding: 1.2rem 1.25rem .85rem;
  background: #eef1f5; color: #18202a; border-radius: var(--r-sm); transform: rotate(1.5deg);
  box-shadow: 0 1px 0 rgba(255,255,255,.6) inset, 0 24px 50px -12px rgba(0,0,0,.6), 0 2px 6px rgba(0,0,0,.3);
  transition: transform .6s var(--ease-spring);
}
.core-output:hover { transform: rotate(0) translateY(-3px); }
.core-output .core-label { color: #4f5d6a; }
.core-output__top { display: flex; align-items: center; justify-content: space-between; gap: .6rem; padding-bottom: .75rem; border-bottom: 1px solid rgba(24,32,42,.12); }
.core-output__page { font: 10.5px var(--font-mono); letter-spacing: .06em; color: #5d6b78; font-variant-numeric: tabular-nums; }
.core-output__content { flex: 1; padding: 1rem 0 .85rem; font-size: 12.5px; line-height: 1.65; }
.core-output__content > * { animation: outputin .5s var(--ease-out) both; }
.core-output__content > *:nth-child(2) { animation-delay: .06s; }
.core-output__content > *:nth-child(3) { animation-delay: .12s; }
.core-output__content > *:nth-child(4) { animation-delay: .18s; }
@keyframes outputin { from { opacity: 0; transform: translateY(6px); } }
.core-output__content h4 { margin: 0 0 .7rem; font-size: 19px; font-weight: 600; letter-spacing: -0.02em; }
.core-output__content p { margin: 0 0 .7rem; color: #4d5a66; }
.core-output__content dl { margin: 0; }
.core-output__content dl div { display: flex; justify-content: space-between; gap: .5rem; border-bottom: 1px solid rgba(24,32,42,.08); padding: .45rem 0; }
.core-output__content dt { color: #5d6b78; }
.core-output__content dd { margin: 0; text-align: right; }
.core-output__content ol { margin: 0; padding-left: 1.25rem; list-style: decimal; }
.core-output__content li { padding: .3rem 0; }
.core-output__content pre { white-space: pre-wrap; overflow-wrap: anywhere; font: 11px/1.8 var(--font-mono); color: #2e5a70; margin: 0; }
.core-output__bottom { display: flex; justify-content: space-between; border-top: 1px solid rgba(24,32,42,.12); padding-top: .6rem; font: 10px var(--font-mono); letter-spacing: .06em; color: #5d6b78; }
.core-output__bottom a { color: inherit; }
.core-bars { display: grid; gap: .55rem; margin: .85rem 0; }
.core-bars > div { display: grid; grid-template-columns: 46px 1fr 26px; gap: .45rem; align-items: center; font: 10.5px var(--font-mono); }
.core-bars i { height: 8px; border-radius: 2px; background: #3d6a86; width: var(--bar); transform-origin: left; animation: core-bar .7s var(--ease-out) both; }
.core-bars > div:first-child i { background: #2f5be6; }
.core-sequence { position: relative; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--ex-line); }
.core-step {
  position: relative; display: flex; gap: .75rem; align-items: center; text-align: left; cursor: pointer;
  padding: 1.35rem 1.25rem; border: 0; background: transparent; color: var(--ex-ink-2); transition: background .3s, color .3s;
}
.core-step + .core-step { border-left: 1px solid var(--ex-line); }
.core-step::after { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 2px; background: var(--core-signal); transform: scaleX(0); transform-origin: left; transition: transform .6s var(--ease-out); }
.core-step:hover { background: var(--ex-bg-2); color: var(--ex-ink); }
.core-step.is-active { background: var(--ex-bg-2); color: var(--ex-ink); }
.core-step.is-active::after { transform: scaleX(1); }
.core-step__number { font: 11px var(--font-mono); align-self: flex-start; margin-top: .2rem; color: var(--ex-ink-3); }
.core-step.is-active .core-step__number { color: var(--core-signal); }
.core-step strong { display: block; font-size: 15px; font-weight: 500; }
.core-step small { display: block; font: 10px var(--font-mono); letter-spacing: .08em; margin-top: .3rem; color: var(--ex-ink-3); }
.core-step__arrow { margin-left: auto; font-size: 16px; opacity: .5; transition: transform .4s var(--ease-out), opacity .3s; }
.core-step:hover .core-step__arrow, .core-step.is-active .core-step__arrow { opacity: 1; transform: translate(2px, -2px); }
.core-case__footer { display: flex; justify-content: space-between; align-items: center; gap: 1.25rem; padding: 1.1rem clamp(1.5rem, 3.5vw, 2.75rem); border-top: 1px solid var(--ex-line); }
.core-case__footer p { font: 11px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ex-ink-3); margin: 0; display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; }
.core-case__footer b { font: 400 13px var(--font-sans); letter-spacing: 0; text-transform: none; color: var(--ex-ink); }
.core-case__link { flex-shrink: 0; display: inline-flex; gap: .6rem; align-items: center; padding: .6rem 1rem; border: 1px solid var(--ex-line-2); border-radius: var(--r-pill); background: transparent; color: var(--ex-ink); font: 13px var(--font-sans); cursor: pointer; transition: border-color .2s, color .2s, background .2s; }
.core-case__link:hover { color: var(--ex-bg); background: var(--core-signal); border-color: var(--core-signal); }
.core-case__link:disabled { opacity: .4; cursor: wait; }
.core-case button:focus-visible { outline: 2px solid var(--core-signal); outline-offset: -4px; }
@keyframes core-turn { to { rotate: 360deg; } }
@keyframes core-bar { from { transform: scaleX(0); } }
@media (max-width: 1000px) {
  .core-lab { grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
  .core-step { padding: 1.2rem .9rem; gap: .5rem; }
  .core-step__arrow { display: none; }
}
@media (max-width: 760px) {
  .core-case__header { flex-direction: column; align-items: flex-start; gap: 1.25rem; }
  .core-case h3 { font-size: clamp(52px, 16vw, 80px); }
  .core-case__intro { max-width: none; }
  .core-lab { grid-template-columns: 1fr; gap: 2.5rem; }
  /* 反应堆只是装饰，窄屏上省掉这一屏 */
  .core-reactor { display: none; }
  .core-output { transform: none; min-height: 240px; }
  .core-sequence { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .core-step:nth-child(3) { border-left: 0; }
  .core-step:nth-child(n+3) { border-top: 1px solid var(--ex-line); }
  .core-reactor__coordinate { display: none; }
  .core-case__footer { flex-direction: column; align-items: flex-start; }
}

/* ---------- 标签页 + 筛选 ---------- */
.projects__controls { display: flex; align-items: center; justify-content: space-between; gap: 1rem 2rem; flex-wrap: wrap; margin-bottom: 1.75rem; }

/* ---------- 项目卡 ---------- */
.projects { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.project {
  --rx: 0deg; --ry: 0deg;
  position: relative; display: flex; flex-direction: column; width: 100%; padding: 0; overflow: hidden; text-align: left; cursor: pointer;
  border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--bg-1); color: var(--ink);
  box-shadow: var(--highlight);
  transform: perspective(1200px) rotateX(var(--rx)) rotateY(var(--ry)) translateY(var(--lift, 0));
  transition: transform .6s var(--ease-out), border-color .3s, box-shadow .5s;
  animation: cardin .7s var(--ease-out) backwards; animation-delay: var(--i, 0s);
}
@keyframes cardin { from { opacity: 0; transform: translateY(16px); } }
.project::before {
  content: ""; position: absolute; inset: 0; z-index: 2; pointer-events: none; border-radius: inherit;
  background: radial-gradient(380px circle at var(--mx, 50%) var(--my, 50%), var(--accent-soft), transparent 65%);
  opacity: 0; transition: opacity .4s;
}
.project:hover { --lift: -4px; border-color: var(--line-2); box-shadow: var(--shadow-lg), var(--highlight); }
.project:hover::before { opacity: 1; }
.project > * { position: relative; z-index: 1; }
.project__thumb { display: none; }
.project__thumb:has(img) { display: block; position: relative; aspect-ratio: 1216 / 520; overflow: hidden; background: #05060a; border-bottom: 1px solid var(--line); }
.project__thumb > img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.6s var(--ease-out), filter .8s; filter: saturate(.9); }
.project:hover .project__thumb > img, .project:focus-visible .project__thumb > img { transform: scale(1.06); filter: saturate(1.05); }
.project__thumb::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(4,6,12,.1) 0%, transparent 35%, rgba(4,6,12,.7) 100%); pointer-events: none; }
/* 天体代号：封面左上角的小标签，不和标题抢 */
.project__codename {
  position: absolute; top: .9rem; left: 1.1rem; z-index: 1; pointer-events: none;
  padding: .28rem .6rem; border: 1px solid rgba(255,255,255,.2); border-radius: var(--r-pill);
  background: rgba(5,6,10,.38); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  color: rgba(255,255,255,.88); font: 10.5px/1.4 var(--font-mono); letter-spacing: .14em; text-transform: uppercase;
}
.project__cover-label {
  position: absolute; z-index: 1; left: 1.1rem; bottom: .95rem; right: 1.1rem; pointer-events: none;
  font: 11px/1.5 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.8);
}
.project__body { display: flex; flex-direction: column; gap: .7rem; flex: 1; padding: 1.4rem clamp(1.25rem, 2.2vw, 1.75rem) 1.5rem; }
.project__meta { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.project__meta [lang="zh-CN"], .project__meta span:first-child { letter-spacing: .06em; }
.project .h3 { font-size: clamp(22px, 2vw, 27px); line-height: 1.3; letter-spacing: -0.025em; transition: color .3s; }
html:not([data-lang="en"]) .project .h3 { font-weight: 600; letter-spacing: -0.01em; }
.project:hover .h3 { color: var(--accent); }
.project__body > p { color: var(--ink-2); font-size: 15px; line-height: 1.7; flex: 1; }
.project .tags { margin-top: .15rem; }
.project__foot { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: .6rem; padding-top: 1.1rem; border-top: 1px solid var(--line); font-size: 13px; color: var(--ink-2); }
.project__foot strong { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; font-weight: 400; color: var(--ink-3); margin-right: .5em; }
.project__foot span:last-child {
  flex-shrink: 0; display: inline-flex; align-items: center; height: 30px; padding: 0 .85rem; border-radius: var(--r-pill); border: 1px solid var(--line-2);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink);
  transition: background .3s, color .3s, border-color .3s;
}
.project:hover .project__foot span:last-child { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.projects__empty { grid-column: 1 / -1; padding: 3rem 0; color: var(--ink-3); }
/* 精选之外的项目：紧凑列表 */
.project-list { grid-column: 1 / -1; margin-top: 1rem; border-top: 1px solid var(--line); }
.project-list__head { display: flex; align-items: center; gap: .6rem; padding: 1.4rem 0 .6rem; font: 11px var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.project-list__head span { color: var(--ink-4); }
.project-row {
  display: grid; grid-template-columns: 132px minmax(0, 1fr) auto 28px; align-items: center; gap: 1.5rem;
  width: 100%; padding: 1rem 0; border: 0; border-bottom: 1px solid var(--line); background: none;
  color: inherit; font: inherit; text-align: left; cursor: pointer; transition: background .3s;
}
.project-row__thumb { display: block; aspect-ratio: 1216 / 520; overflow: hidden; border-radius: var(--r-sm, 8px); background: #05060a; border: 1px solid var(--line); }
.project-row__thumb img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.85); transition: transform 1.2s var(--ease-out), filter .6s; }
.project-row__text { display: grid; gap: .3rem; min-width: 0; }
.project-row__text strong { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); transition: color .3s; }
.project-row__text > span { color: var(--ink-3); font-size: 14px; line-height: 1.6; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.project-row__meta { display: flex; flex-direction: column; align-items: flex-end; gap: .35rem; font: 11px var(--font-mono); letter-spacing: .08em; color: var(--ink-3); white-space: nowrap; }
.project-row__arrow { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid var(--line-2); border-radius: 50%; color: var(--ink-3); transition: background .3s, color .3s, border-color .3s; }
.project-row:hover .project-row__text strong, .project-row:focus-visible .project-row__text strong { color: var(--accent); }
.project-row:hover .project-row__thumb img { transform: scale(1.08); filter: saturate(1.05); }
.project-row:hover .project-row__arrow { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.project-row:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (max-width: 760px) {
  .project-row { grid-template-columns: 88px minmax(0, 1fr); gap: .25rem 1rem; padding: .9rem 0; }
  .project-row__thumb { grid-row: span 2; }
  .project-row__text > span { white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; font-size: 13.5px; }
  .project-row__meta { flex-direction: row; align-items: center; gap: .8rem; grid-column: 2; }
  .project-row__arrow { display: none; }
}
@media (max-width: 760px) {
  .projects { grid-template-columns: 1fr; }
  .project__foot { flex-direction: column; align-items: flex-start; }
}

/* =========================================================
   关于
   ========================================================= */
.about__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr); gap: clamp(2.5rem, 7vw, 7rem); align-items: start; }
.about__side { position: sticky; top: calc(var(--nav-h) + 2rem); }
.portrait { position: relative; width: 168px; margin: 2.5rem 0 1.75rem; }
.portrait img {
  width: 100%; aspect-ratio: 5 / 6; height: auto; object-fit: cover; object-position: 50% 30%; border-radius: var(--r-md);
  filter: grayscale(1) contrast(1.05); border: 1px solid var(--line);
  transition: filter .8s var(--ease), transform .8s var(--ease-out), border-radius .8s var(--ease-out);
}
.portrait:hover img { filter: grayscale(0); transform: rotate(-2deg) scale(1.02); border-radius: 50% 50% var(--r-md) var(--r-md); }
.portrait figcaption { display: flex; justify-content: space-between; margin-top: .75rem; font: 10.5px var(--font-mono); letter-spacing: .1em; color: var(--ink-3); }
.path { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem .4rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.path li { display: inline-flex; align-items: center; padding: .35rem .75rem; border-radius: var(--r-pill); border: 1px solid var(--line-2); font: 11px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.path li:not(:last-child)::after { content: "→"; margin: 0 -.2rem 0 .6rem; color: var(--ink-4); }
.path li.is-current { border-color: var(--accent); color: var(--ink); background: var(--accent-soft); }
.about__main .prose { max-width: 64ch; line-height: 1.95; color: var(--ink-2); }
html:not([data-lang="en"]) .about__main .prose { font-size: 16.5px; letter-spacing: .01em; }
.about__main .prose p:first-child { font-size: 1.22em; line-height: 1.7; color: var(--ink); letter-spacing: -0.01em; }
.about__quote { margin: 2.25rem 0; padding: .25rem 0 .25rem 1.5rem; border-left: 2px solid var(--accent); }
.about__main .prose .about__quote p { margin: 0; font-size: clamp(24px, 2.6vw, 32px); line-height: 1.35; font-weight: 600; letter-spacing: -0.02em; color: var(--ink); }
html[data-lang="en"] .about__main .prose .about__quote p { font-weight: 500; letter-spacing: -0.035em; }
.skills { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; margin-top: 3rem; background: var(--line); border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; counter-reset: skill; }
.skills li { padding: 1.4rem 1.5rem; background: var(--bg); font-size: 14px; line-height: 1.75; color: var(--ink-3); transition: background .3s; }
.skills li:hover { background: var(--bg-1); }
.skills li strong { display: flex; align-items: baseline; gap: .6rem; margin-bottom: .5rem; font-size: 15.5px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.skills li strong::before { counter-increment: skill; content: counter(skill, decimal-leading-zero); font: 400 10.5px var(--font-mono); letter-spacing: .1em; color: var(--accent); }
.now { margin-top: 1.5rem; padding: 1.5rem 1.6rem; border: 1px solid var(--line); border-radius: var(--r-md); background: var(--bg-1); box-shadow: var(--highlight); }
.now__head { display: flex; align-items: center; gap: .65rem; margin-bottom: 1.1rem; }
.now__head .eyebrow { margin: 0; color: var(--ink); }
.now__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); animation: pulse 2.6s ease-out infinite; }
.now__updated { margin-left: auto; font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.now__list { display: grid; gap: .8rem; font-size: 15px; line-height: 1.65; color: var(--ink-2); }
.now__list li { display: grid; grid-template-columns: 5.5em 1fr; gap: .75rem; }
.now__list strong { font: 400 11px/2.1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
@media (max-width: 900px) {
  .about__grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .about__side { position: static; }
}
@media (max-width: 600px) {
  .skills { grid-template-columns: 1fr; }
  .now__list li { grid-template-columns: 1fr; gap: .1rem; }
}

/* =========================================================
   焊缝：一件材料研究式的交互图
   ========================================================= */
.conviction {
  --weld-heat: var(--ex-accent);
  position: relative; overflow: hidden; scroll-margin-top: 65px; padding: clamp(5rem, 9vw, 8rem) 0;
  background: var(--ex-bg); color: var(--ex-ink); border-block: 1px solid var(--ex-line);
}
.conviction::before { content: ""; position: absolute; width: 900px; height: 900px; right: -200px; top: -200px; background: radial-gradient(closest-side, rgba(143,191,255,.07), transparent); pointer-events: none; }
.conviction__grid { position: relative; display: grid; grid-template-columns: .95fr 1.1fr; gap: 6vw; align-items: center; }
.conviction__copy > .eyebrow { color: var(--ex-ink-3); margin-bottom: 2rem; }
.conviction__title { font-size: clamp(40px, 5vw, 76px); font-weight: 500; line-height: 1.12; letter-spacing: -0.055em; margin: 0; }
.conviction__title [lang="zh-CN"] { font-weight: 600; letter-spacing: -0.025em; line-height: 1.2; }
.conviction__ink { position: relative; color: var(--weld-heat); }
.conviction__ink::after { content: ""; position: absolute; left: 0; bottom: -.04em; height: 2px; width: var(--belief-fill, 100%); max-width: calc(100% - .1em); background: linear-gradient(90deg, transparent, var(--weld-heat)); border-radius: 2px; }
.conviction__intro { margin: 2rem 0 2.5rem; color: var(--ex-ink-2); font-size: 15px; line-height: 1.9; }
.conviction .link-arrow { color: var(--ex-ink); border-color: var(--ex-line-2); }
.conviction .link-arrow:hover { color: var(--weld-heat); border-color: currentColor; }
.weld { min-width: 0; position: relative; }
.weld__stage { position: relative; background: radial-gradient(ellipse at 52% 47%, rgba(51,68,81,.25), transparent 65%); }
.weld__topline { display: flex; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--ex-line-2); padding-top: .8rem; color: var(--ex-ink-3); font: 10.5px/1.6 var(--font-mono); letter-spacing: .12em; }
.weld__status { color: var(--weld-heat); display: flex; align-items: center; gap: .45rem; }
.weld__status::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: currentColor; animation: pulse 2.6s ease-out infinite; }
.weld__diagram { position: relative; perspective: 900px; }
.weld__diagram svg { position: relative; display: block; width: 100%; overflow: visible; transform: rotateX(var(--weld-tilt-x, 0deg)) rotateY(var(--weld-tilt-y, 0deg)); transition: transform .5s var(--ease-out); }
.weld__construction { stroke: #8da4b2; stroke-width: .6; stroke-dasharray: 2 8; opacity: .18; }
.weld__plate { transition: transform 1s var(--ease-out), opacity .5s; cursor: pointer; }
.weld__plate--semantics { transform: translateY(-55px); }
.weld__plate--capability { transform: translateY(55px); }
.weld__surface { fill: url(#weld-surface); stroke: url(#weld-edge); stroke-width: 1; transition: stroke .5s, fill .5s; }
.weld__thickness { fill: #152130; stroke: rgba(115,139,158,.33); stroke-width: .7; }
.weld__trace { stroke: rgba(164,186,199,.17); stroke-width: .8; transition: stroke .5s; }
.weld__glyph { stroke: #a8c0cf; stroke-width: 1.1; }
.weld__plate-label { fill: #b5c5cf; font: 10px var(--font-mono); letter-spacing: .15em; }
[data-focus="semantics"] .weld__plate--semantics .weld__surface, [data-focus="data"] .weld__plate--data .weld__surface, [data-focus="capability"] .weld__plate--capability .weld__surface { stroke: var(--weld-heat); }
[data-focus="semantics"] .weld__plate--semantics .weld__trace, [data-focus="data"] .weld__plate--data .weld__trace, [data-focus="capability"] .weld__plate--capability .weld__trace { stroke: rgba(143,191,255,.5); }
.weld__plate:hover .weld__surface { fill: rgba(113,131,145,.33); }
.weld__connection { transition: opacity .5s; pointer-events: none; }
.weld__seam-glow { stroke: #5fa8ff; stroke-width: 12; opacity: .22; filter: url(#weld-glow); }
.weld__seam { stroke: url(#weld-copper); stroke-width: 1.8; opacity: .8; }
.weld__signal { stroke: #eef6ff; stroke-width: 3; stroke-linecap: round; stroke-dasharray: 10 170; animation: weld-flow 8s linear infinite; animation-play-state: paused; }
.conviction.is-visible .weld__signal { animation-play-state: running; }
.weld__connection circle { fill: #eef6ff; stroke: var(--weld-heat); stroke-width: 3; }
.weld__annotation { fill: #82a6c6; font: 10px var(--font-mono); letter-spacing: .1em; transition: opacity .4s; }
.weld__annotation-line { stroke: rgba(130,166,198,.4); stroke-width: .6; transition: opacity .4s; }
.weld__ghost { position: absolute; left: 50%; bottom: 6%; transform: translateX(-50%) translateY(10px); font: 400 24px var(--font-mono); letter-spacing: .2em; color: var(--ex-ink-2); opacity: 0; transition: opacity .5s, transform .6s var(--ease-out); pointer-events: none; }
.weld__experiment { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: -.5rem; padding-bottom: 1.4rem; }
.weld__experiment p { color: var(--ex-ink-2); font-size: 13.5px; line-height: 1.6; margin: 0; }
.weld__toggle {
  display: inline-flex; align-items: center; gap: .55rem; min-height: 38px; flex-shrink: 0; padding: 0 1rem; cursor: pointer;
  color: var(--ex-ink); background: rgba(143,191,255,.06); border: 1px solid rgba(143,191,255,.3); border-radius: var(--r-pill);
  font: 13px var(--font-sans); transition: background .25s, border-color .25s;
}
.weld__toggle:hover { background: rgba(143,191,255,.14); border-color: var(--weld-heat); }
.weld__toggle-icon { font-size: 15px; color: var(--weld-heat); }
[data-connected="false"] .weld__plate--semantics { transform: translate(-17px, -104px); }
[data-connected="false"] .weld__plate--capability { transform: translate(17px, 104px); }
[data-connected="false"] .weld__connection, [data-connected="false"] .weld__annotation, [data-connected="false"] .weld__annotation-line { opacity: 0; }
[data-connected="false"] .weld__signal { animation-play-state: paused; }
[data-connected="false"] .weld__ghost { opacity: .65; transform: translateX(-50%) translateY(12px); }
[data-connected="false"] .weld__status { color: var(--ex-ink-3); }
.weld__controls { position: relative; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-block: 1px solid var(--ex-line-2); }
.weld__controls button {
  position: relative; display: flex; align-items: center; gap: .6rem; padding: 1rem .75rem; text-align: left; cursor: pointer;
  background: none; border: 0; font: 14px var(--font-sans); color: var(--ex-ink-2); transition: color .3s, background .3s;
}
.weld__controls button::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--weld-heat); transform: scaleX(0); transform-origin: left; transition: transform .6s var(--ease-out); }
.weld__controls button + button { border-left: 1px solid var(--ex-line); }
.weld__controls small { font: 10.5px var(--font-mono); color: var(--ex-ink-3); }
.weld__controls button[aria-pressed="true"] { color: var(--ex-ink); background: rgba(143,191,255,.05); }
.weld__controls button[aria-pressed="true"]::after { transform: scaleX(1); }
.weld__controls button[aria-pressed="true"] small { color: var(--weld-heat); }
.weld__controls button:hover { color: var(--ex-ink); background: rgba(143,191,255,.06); }
.weld button:focus-visible, .conviction a:focus-visible { outline: 2px solid var(--weld-heat); outline-offset: 3px; }
.weld__description { min-height: 6rem; padding-top: 1rem; font-size: 14px; line-height: 1.85; color: var(--ex-ink-2); }
.weld__description p { margin: 0; }
.weld__description p:not([hidden]) { animation: outputin .5s var(--ease-out); }
@keyframes weld-flow { to { stroke-dashoffset: -720; } }
@media (max-width: 900px) { .conviction__grid { grid-template-columns: 1fr; gap: 3rem; } .weld { max-width: 560px; width: 100%; margin: 0 auto; } }
/* 浅色主题：整段不再是一条深色横带。文字跟随页面主题，只有右侧的图保留深色，做成和 AI Core 一样的陈列柜 */
html:not([data-theme="dark"]) .conviction { background: var(--bg); color: var(--ink); border-block-color: var(--line); }
html:not([data-theme="dark"]) .conviction::before { background: radial-gradient(closest-side, var(--accent-soft), transparent); }
html:not([data-theme="dark"]) .conviction__copy {
  --ex-ink: var(--ink); --ex-ink-2: var(--ink-2); --ex-ink-3: var(--ink-3); --ex-line-2: var(--line-2); --weld-heat: var(--accent);
}
html:not([data-theme="dark"]) .weld {
  padding: 1.25rem clamp(1.1rem, 2.4vw, 1.75rem) .5rem; border: 1px solid var(--ex-line-2); border-radius: var(--r-lg);
  background: var(--ex-bg); color: var(--ex-ink); box-shadow: var(--shadow-lg);
}
html:not([data-theme="dark"]) .weld__topline { border-top: 0; padding-top: 0; }

/* =========================================================
   研究方向 / 经历：共用平滑展开的手风琴
   展开用 grid-template-rows 0fr → 1fr，高度不写死
   ========================================================= */
.research__details, .timeline__details {
  display: grid; grid-template-rows: 0fr; opacity: 0;
  transition: grid-template-rows .6s var(--ease-out), opacity .45s var(--ease);
}
.acc { min-height: 0; overflow: hidden; }
.is-open > .research__details, .is-open > .timeline__details,
.timeline__item.is-open .timeline__details { grid-template-rows: 1fr; opacity: 1; }
/* 未启用脚本时，静态 HTML 里没有 hidden 的条目默认展开 */
.research__details:not([data-acc]), .timeline__details:not([data-acc]) { grid-template-rows: 1fr; opacity: 1; }
/* 加减号：代替旧的 V 形箭头 */
.timeline__chev { position: relative; width: 28px; height: 28px; border: 1px solid var(--line-2); border-radius: 50%; justify-self: end; flex: none; transition: border-color .3s, background .3s, transform .6s var(--ease-out); }
.timeline__chev::before, .timeline__chev::after { content: ""; position: absolute; left: 50%; top: 50%; width: 10px; height: 1px; background: var(--ink); transform: translate(-50%, -50%); transition: transform .5s var(--ease-out); }
.timeline__chev::after { transform: translate(-50%, -50%) rotate(90deg); }
[aria-expanded="true"] .timeline__chev { transform: rotate(180deg); border-color: var(--ink); }
[aria-expanded="true"] .timeline__chev::after { transform: translate(-50%, -50%) rotate(0deg); }
.research__toggle:hover .timeline__chev, .timeline__toggle:hover .timeline__chev { border-color: var(--ink); background: var(--bg-1); }

/* ---------- 研究方向 ---------- */
.research { border-top: 1px solid var(--line-2); counter-reset: research; }
.research__item { border-bottom: 1px solid var(--line); }
.research__toggle {
  display: grid; grid-template-columns: 3.5rem 136px minmax(0, 1fr) 28px; gap: 1.5rem; align-items: center;
  width: 100%; padding: 1.6rem 0; text-align: left; background: none; border: 0; cursor: pointer; color: var(--ink);
}
.research__num { font: 12px var(--font-mono); letter-spacing: .1em; color: var(--ink-3); transition: color .3s; }
.research__item.is-open .research__num, .research__toggle:hover .research__num { color: var(--accent); }
.research__thumb { width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; border-radius: var(--r-sm); background: #05060a; border: 1px solid var(--line); transition: transform 1s var(--ease-out), filter .6s; filter: saturate(.85); }
.research__toggle:hover .research__thumb, .research__item.is-open .research__thumb { transform: scale(1.04) rotate(-1deg); filter: saturate(1.1); }
.research__titles { display: flex; flex-direction: column; gap: .45rem; }
.research__titles .h3 { font-size: clamp(21px, 2.1vw, 27px); letter-spacing: -0.025em; transition: color .3s; }
html:not([data-lang="en"]) .research__titles .h3 { font-weight: 600; letter-spacing: -0.01em; }
.research__toggle:hover .h3 { color: var(--accent); }
.research__thesis { color: var(--ink-3); font-size: 15px; line-height: 1.65; max-width: 64ch; }
.research__details .acc__in { padding: .25rem 0 2.25rem calc(3.5rem + 136px + 3rem); max-width: calc(72ch + 3.5rem + 136px + 3rem); color: var(--ink-2); line-height: 1.85; }
.research__details .bullets { margin-top: 1.1rem; gap: .7rem; }
.research__open { margin-top: 1.5rem; padding: 1.1rem 1.25rem; border: 1px dashed var(--line-2); border-radius: var(--r-md); color: var(--ink-2); font-size: 15px; }
.research__open strong { display: block; margin-bottom: .35rem; font: 400 11px var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
@media (max-width: 900px) {
  .research__toggle { grid-template-columns: 96px minmax(0, 1fr) 28px; gap: 1.1rem; }
  .research__num { display: none; }
  .research__details .acc__in { padding-left: 0; }
}
@media (max-width: 600px) {
  .research__toggle { grid-template-columns: minmax(0, 1fr) 28px; align-items: start; }
  .research__thumb { display: none; }
}

/* ---------- 经历 ---------- */
.timeline { border-top: 1px solid var(--line-2); }
.timeline__item { position: relative; display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 0 3rem; border-bottom: 1px solid var(--line); }
.timeline__item::before { content: ""; position: absolute; left: calc(190px + 1.5rem); top: 0; bottom: 0; width: 1px; background: var(--line); }
.timeline__item:first-child::before { top: 2.3rem; }
.timeline__item:last-child::before { bottom: calc(100% - 2.3rem); }
.timeline__item::after {
  content: ""; position: absolute; left: calc(190px + 1.5rem - 4px); top: 2.3rem; width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 1px solid var(--line-strong); transition: background .3s, border-color .3s, box-shadow .4s;
}
.timeline__item.is-open::after, .timeline__item:hover::after { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 0 5px var(--accent-soft); }
.timeline__when { padding-top: 1.95rem; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.timeline__item.is-open .timeline__when { color: var(--ink); }
.timeline__body { min-width: 0; }
.timeline__toggle { display: grid; grid-template-columns: minmax(0, 1fr) 28px; gap: 1rem; align-items: center; width: 100%; padding: 1.6rem 0; text-align: left; background: none; border: 0; cursor: pointer; color: var(--ink); }
.timeline__logo { display: none; }
.timeline__logos { display: flex; align-items: center; gap: .75rem; height: 16px; margin-bottom: .6rem; }
.timeline__logos img { height: 13px; width: auto; filter: grayscale(1) contrast(1.05); opacity: .5; transition: filter .4s, opacity .4s; }
.timeline__logos img.is-crest { height: 18px; }
html[data-theme="dark"] .timeline__logos img { filter: grayscale(1) invert(1) contrast(1.05); opacity: .45; }
.timeline__toggle:hover .timeline__logos img, .timeline__item.is-open .timeline__logos img { opacity: .9; }
.timeline__titles { display: flex; flex-direction: column; gap: .3rem; }
.timeline__titles .h3 { font-size: clamp(21px, 2vw, 26px); letter-spacing: -0.02em; transition: color .3s; }
html:not([data-lang="en"]) .timeline__titles .h3 { font-weight: 600; letter-spacing: -0.01em; }
.timeline__toggle:hover .h3 { color: var(--accent); }
.timeline__toggle--static { cursor: default; grid-template-columns: 1fr; }
.timeline__toggle--static:hover .h3 { color: var(--ink); }
.timeline__role { font: 12.5px var(--font-mono); letter-spacing: .03em; color: var(--ink-3); }
.timeline__details .acc__in { max-width: 68ch; padding-bottom: 2rem; color: var(--ink-2); line-height: 1.85; }
.timeline__details .tags { margin-top: 1.25rem; }
@media (max-width: 760px) {
  .timeline__item { grid-template-columns: 1fr; }
  .timeline__item::before, .timeline__item::after { display: none; }
  .timeline__when { padding-top: 1.4rem; }
  .timeline__toggle { padding-top: .4rem; }
}

/* =========================================================
   联系
   ========================================================= */
.section--cta { overflow: hidden; }
.cta { position: relative; isolation: isolate; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 1.5rem 4rem; align-items: end; }
.cta .eyebrow { grid-column: 1 / -1; margin-bottom: 0; }
.cta__signature {
  position: absolute; right: -1vw; top: -5rem; z-index: -1; pointer-events: none;
  font-size: clamp(140px, 27vw, 400px); line-height: 1; letter-spacing: -0.09em; font-weight: 600;
  background: linear-gradient(180deg, var(--line-2), transparent 85%); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.cta__star { display: inline-block; font-size: .7em; vertical-align: .05em; animation: core-turn 60s linear infinite; animation-play-state: paused; }
.cta.is-in .cta__star { animation-play-state: running; }
.cta__title { grid-column: 1 / -1; font-size: clamp(52px, 8.4vw, 132px); font-weight: 500; letter-spacing: -0.06em; line-height: .95; margin-bottom: 1rem; }
.cta__title [lang="zh-CN"] { display: inline-block; font-weight: 600; letter-spacing: -0.03em; line-height: 1.1; }
.cta__lead { grid-column: 1; max-width: 44ch; color: var(--ink-2); font-size: 16.5px; line-height: 1.8; margin: 0; }
.cta .hero__actions { grid-column: 2; grid-row: 3; display: flex; justify-content: flex-end; }
.cta .hero__actions .btn { padding: 1.15rem 1.9rem; font-size: 13px; }
.cta__hint { grid-column: 1 / -1; font-size: 13px; margin: 0; color: var(--ink-3); }
.cta__topics { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin: 1.5rem 0 .5rem; }
.cta__topics li { padding: 1.4rem 1.5rem 1.5rem; border: 1px solid var(--line); border-radius: var(--r-md); background: color-mix(in srgb, var(--bg-1) 70%, transparent); font-size: 14.5px; line-height: 1.75; color: var(--ink-3); box-shadow: var(--highlight); transition: border-color .3s, transform .5s var(--ease-out); }
.cta__topics li:hover { border-color: var(--line-2); transform: translateY(-3px); }
.cta__topics li strong { display: block; margin-bottom: .55rem; font-size: 16px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
@media (max-width: 900px) {
  .cta { grid-template-columns: 1fr; align-items: start; }
  .cta .hero__actions { grid-column: 1; grid-row: auto; justify-content: flex-start; }
  .cta__topics { grid-template-columns: 1fr; }
}

/* ---------- 项目卡封面上的小故事（stories.js） ----------
   玻璃面板叠在天体图右侧；类名 s1–s4 逐步累加，每一步用过渡演出 */
.story {
  position: absolute; z-index: 1; top: .9rem; right: 1.1rem; width: min(48%, 250px);
  display: grid; gap: .5rem; padding: .7rem .8rem .75rem;
  border: 1px solid rgba(255,255,255,.14); border-radius: 10px;
  background: rgba(8,10,16,.52); -webkit-backdrop-filter: blur(10px) saturate(1.2); backdrop-filter: blur(10px) saturate(1.2);
  color: rgba(255,255,255,.86); font: 10.5px/1.4 var(--font-mono); letter-spacing: .02em;
  pointer-events: none; box-shadow: 0 10px 30px -12px rgba(0,0,0,.6);
}
.story > * { transition: opacity .5s var(--ease-out), transform .6s var(--ease-out); }
.story__head { display: flex; justify-content: space-between; gap: .5rem; color: rgba(255,255,255,.55); letter-spacing: .08em; text-transform: uppercase; }

/* 主动洞察：柱状图 → 断崖 → 核验 → 预警 */
.story__bars { position: relative; display: flex; align-items: flex-end; gap: 4px; height: 46px; border-bottom: 1px solid rgba(255,255,255,.14); }
.story__bars i {
  flex: 1; height: var(--h); border-radius: 2px 2px 0 0; background: var(--ex-accent); opacity: .85;
  transform: scaleY(0); transform-origin: bottom;
  transition: transform .55s var(--ease-out) calc(var(--k) * 70ms), background .3s, height .5s var(--ease-out);
}
.story.s1 .story__bars i { transform: scaleY(1); }
.story.s2 .story__bars i:last-of-type { height: 12%; background: #ff6b5e; transition-delay: 0s; }
.story__drop {
  position: absolute; right: 0; top: -2px; padding: 1px 5px; border-radius: 4px;
  background: rgba(255,107,94,.18); color: #ff8b80; font-weight: 600;
  opacity: 0; transform: translateY(4px); transition: opacity .4s .25s, transform .4s .25s var(--ease-out);
}
.story.s2 .story__drop { opacity: 1; transform: none; }
.story__check { display: flex; align-items: center; gap: 6px; color: rgba(255,255,255,.6); opacity: .35; }
.story__check span { margin-right: auto; }
.story__check i { width: 14px; height: 4px; border-radius: 2px; background: rgba(255,255,255,.16); transition: background .3s calc(var(--k) * 380ms + 150ms); }
.story.s3 .story__check { opacity: 1; }
.story.s3 .story__check i { background: var(--ex-accent); }

.story__toast {
  display: flex; align-items: center; gap: 7px; padding: .42rem .55rem; border-radius: 7px;
  font-weight: 500; opacity: .4; border: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.7);
  transition: opacity .5s var(--ease-out), transform .6s var(--ease-out), background .4s, border-color .4s, color .4s;
}
.story.s4 .story__toast { opacity: 1; animation: storyPop .5s var(--ease-out); }
@keyframes storyPop { from { transform: translateY(6px) scale(.97); } }
.story.s4 .story__toast--warn { background: rgba(255,107,94,.16); border-color: rgba(255,107,94,.35); color: #ffd3ce; }
.story__hit, .story.s4 .story__idle { display: none; }
.story.s4 .story__hit { display: inline; }
.story__dot { width: 7px; height: 7px; border-radius: 50%; background: rgba(255,255,255,.4); box-shadow: 0 0 0 0 rgba(255,107,94,.6); transition: background .3s; }
.story.s4 .story__dot { background: #ff6b5e; }
.story.s4 .story__dot { animation: storyPing 1.2s var(--ease-out) infinite; }
@keyframes storyPing { to { box-shadow: 0 0 0 7px rgba(255,107,94,0); } }

/* 交易运营：邮件 → 字段 → CRM → 人工确认 */
.story__mail { display: flex; align-items: center; gap: 7px; opacity: .3; transform: translateX(14px); }
.story__mail em { margin-left: auto; font-style: normal; color: rgba(255,255,255,.5); white-space: nowrap; }
.story.s1 .story__mail { opacity: 1; transform: none; }
.story__env { position: relative; width: 14px; height: 10px; border: 1.3px solid var(--ex-accent); border-radius: 2px; flex: none; }
.story__env::after { content: ""; position: absolute; left: 1px; right: 1px; top: -1px; height: 6px; border: solid var(--ex-accent); border-width: 0 1.3px 1.3px 0; transform: rotate(45deg) scale(.62); transform-origin: 50% 20%; }
.story__fields { display: flex; flex-wrap: wrap; gap: 4px; }
.story__fields span {
  padding: 2px 6px; border-radius: 4px; background: rgba(143,191,255,.12); border: 1px solid rgba(143,191,255,.28); color: rgba(255,255,255,.62);
  opacity: 0; transform: translateY(-6px) scale(.9);
  transition: opacity .35s calc(var(--k) * 260ms), transform .45s var(--ease-out) calc(var(--k) * 260ms);
}
.story__fields b { color: #fff; font-weight: 500; }
.story.s2 .story__fields span { opacity: 1; transform: none; }
.story.s3 .story__fields span { opacity: .35; transform: translateY(6px) scale(.96); transition-delay: 0s; }
.story__row { display: flex; align-items: center; gap: 7px; padding: .35rem .5rem; border-radius: 6px; background: rgba(255,255,255,.05); border: 1px dashed rgba(255,255,255,.18); transition: border-color .4s, background .4s; }
.story__fill { flex: 1; height: 4px; border-radius: 2px; background: linear-gradient(90deg, var(--ex-accent), #9ff0c8) 0 0 / 0% 100% no-repeat, rgba(255,255,255,.1); transition: background-size .9s var(--ease-out) .15s; }
.story__ok { color: #9ff0c8; opacity: 0; transition: opacity .3s .9s; }
.story.s3 .story__row { border-style: solid; border-color: rgba(159,240,200,.35); background: rgba(159,240,200,.06); }
.story.s3 .story__fill { background-size: 100% 100%, auto; }
.story.s3 .story__ok { opacity: 1; }
.story.s4 .story__toast--gate { background: rgba(255,200,87,.12); border-color: rgba(255,200,87,.35); color: #ffe3a8; }
.story__lock { --c: rgba(255,255,255,.5); position: relative; width: 9px; height: 7px; margin-top: 3px; border-radius: 1.5px; background: var(--c); flex: none; }
.story__lock::before { content: ""; position: absolute; left: 1.5px; right: 1.5px; bottom: 5px; height: 5px; border: 1.3px solid var(--c); border-bottom: 0; border-radius: 4px 4px 0 0; }
.story.s4 .story__lock { --c: #ffc857; }

/* 窄屏：卡片封面太矮，面板缩小并只留关键行 */
@media (max-width: 520px) {
  .story { top: .6rem; right: .6rem; width: 56%; gap: .35rem; padding: .5rem .55rem; font-size: 9.5px; }
  .story__bars { height: 30px; }
  .story__head, .story__fields, .project__thumb:has(.story) .project__cover-label { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .story > *, .story * { transition: none !important; animation: none !important; }
}