/* ───────────────────────────────────────────────────────────
   Theme tokens
   ─────────────────────────────────────────────────────────── */
:root {
  --bg:        oklch(0.985 0.005 85);
  --fg:        oklch(0.20 0.015 250);
  --muted:    oklch(0.55 0.01 250);
  --surface:  oklch(0.965 0.008 85);
  --warm:     oklch(0.955 0.018 75);
  --hairline:        color-mix(in oklch, var(--fg) 14%, transparent);
  --hairline-strong: color-mix(in oklch, var(--fg) 28%, transparent);
  --accent:   oklch(0.62 0.13 145);
  --p: 0;

  color-scheme: light;
}
.dark {
  --bg:        oklch(0.13 0.01 250);
  --fg:        oklch(0.94 0.01 85);
  --muted:    oklch(0.62 0.01 250);
  --surface:  oklch(0.17 0.012 250);
  --warm:     oklch(0.18 0.018 60);
  --hairline:        color-mix(in oklch, var(--fg) 14%, transparent);
  --hairline-strong: color-mix(in oklch, var(--fg) 32%, transparent);
  color-scheme: dark;
}

html, body {
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
  font-feature-settings: "ss01", "tnum";
}
.font-serif { font-family: 'Instrument Serif', Georgia, serif; }
.font-mono  { font-family: 'Geist Mono', ui-monospace, monospace; }
.tabular { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }

::selection { background: color-mix(in oklch, var(--accent) 35%, transparent); color: var(--fg); }

/* hairlines */
.hairline       { border-color: var(--hairline); }
.hairline-b     { border-bottom: .5px solid var(--hairline); }
.hairline-t     { border-top:    .5px solid var(--hairline); }

/* ───────────────────────────────────────────────────────────
   Top scroll progress hairline (driven by --p)
   ─────────────────────────────────────────────────────────── */
.scroll-bar {
  position: fixed; top: 0; left: 0; height: 1px;
  width: calc(var(--p, 0) * 100%);
  background: var(--accent);
  z-index: 60; pointer-events: none;
  transition: width .12s linear;
}

/* ───────────────────────────────────────────────────────────
   Custom cursor
   ─────────────────────────────────────────────────────────── */
.cursor-on, .cursor-on * { cursor: none !important; }
@media (hover: none) { .cursor-on, .cursor-on * { cursor: auto !important; } }

/* macOS 风格 arrow 指针 — 反色 stroke 描边自适应明暗主题 */
.cur-logo {
  position: fixed; top: 0; left: 0;
  margin: -1px 0 0 -1px;          /* arrow tip 对齐鼠标点 */
  z-index: 9999; pointer-events: none;
  color: var(--fg);
  will-change: transform;
  transition: opacity .25s ease, color .3s ease;
  filter: drop-shadow(0 1px 1px color-mix(in oklch, var(--fg) 25%, transparent));
}
.cur-logo.active {
  color: var(--accent);
  filter: drop-shadow(0 1px 4px color-mix(in oklch, var(--accent) 50%, transparent));
}
.cur-svg {
  display: block;
  transform-origin: 0 0;
  transition: transform .25s cubic-bezier(.2,.8,.2,1);
}
.cur-logo.active .cur-svg { transform: scale(1.1); }

/* 鼠标 trail — AI logo 散落 */
.cur-trail {
  position: fixed; inset: 0;
  z-index: 9990; pointer-events: none;
}
.cur-trail-item {
  position: absolute;
  width: 34px; height: 34px;
  margin: -17px 0 0 -17px;
  border-radius: 8px;
  padding: 4px;
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: blur(6px);
  border: .5px solid var(--hairline);
  box-shadow: 0 10px 24px -10px color-mix(in oklch, var(--fg) 35%, transparent);
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  animation: trail-pop .8s cubic-bezier(.25,.6,.3,1) forwards;
  will-change: transform, opacity;
  transform-origin: center center;
}
/* 起步放大 → 回落标准 → 渐缩消散；整体半透明朦胧感 */
@keyframes trail-pop {
  0%   { opacity: 0;   transform: scale(1.35) rotate(var(--r, 0deg)) translateY(0); }
  8%   { opacity: .7;  transform: scale(1.35) rotate(var(--r, 0deg)) translateY(0); }
  22%  { opacity: .6;  transform: scale(1)    rotate(var(--r, 0deg)) translateY(0); }
  55%  { opacity: .4;  transform: scale(.7)   rotate(var(--r, 0deg)) translateY(-3px); }
  100% { opacity: 0;   transform: scale(.32)  rotate(var(--r, 0deg)) translateY(-10px); }
}

/* tap-to-burst — 点击/触摸位置向外迸发 */
.cur-burst {
  position: fixed; inset: 0;
  z-index: 9995; pointer-events: none;
}
.cur-burst-item {
  position: absolute;
  width: 30px; height: 30px;
  margin: -15px 0 0 -15px;
  border-radius: 8px;
  padding: 4px;
  background: color-mix(in oklch, var(--bg) 90%, transparent);
  border: .5px solid var(--hairline);
  box-shadow: 0 8px 24px -10px color-mix(in oklch, var(--fg) 30%, transparent);
  object-fit: contain;
  user-select: none; -webkit-user-drag: none;
  animation: burst-pop .95s cubic-bezier(.18,.85,.25,1) forwards;
  will-change: transform, opacity;
  transform-origin: center center;
}
@keyframes burst-pop {
  0%   { opacity: 0; transform: translate(0,0) scale(.3) rotate(0deg); }
  18%  { opacity: 1; transform: translate(calc(var(--dx,0px)*.45), calc(var(--dy,0px)*.45)) scale(1) rotate(calc(var(--r,0deg)*.4)); }
  65%  { opacity: 1; transform: translate(var(--dx,0px), var(--dy,0px)) scale(1) rotate(var(--r,0deg)); }
  100% { opacity: 0; transform: translate(calc(var(--dx,0px)*1.12), calc(var(--dy,0px)*1.12 + 10px)) scale(.82) rotate(var(--r,0deg)); }
}

/* ───────────────────────────────────────────────────────────
   Reveal on scroll
   ─────────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .9s cubic-bezier(.2,.8,.2,1), transform .9s cubic-bezier(.2,.8,.2,1);
}
.reveal.in { opacity: 1; transform: none; }

/* split-text */
.split-line {
  display: inline-block; overflow: hidden; vertical-align: bottom;
  /* 给下伸笔画 (g/y/p/q/j) 留空间，避免被 overflow:hidden 切掉 */
  padding-bottom: 0.22em;
  line-height: 1;
}
.split-line > span {
  display: inline-block;
  transform: translateY(110%);
  transition: transform .9s cubic-bezier(.2,.85,.2,1);
}
.split-line.in > span { transform: translateY(0); }

/* per-letter hover for hero name — 仅位移，不变色 */
.hov-name { display: inline; }
.hov-letter {
  display: inline-block;
  transition: transform .35s cubic-bezier(.2,.8,.2,1);
}
.hov-letter:hover { transform: translateY(-6px) rotate(-2deg); }

/* magnet button */
.magnet {
  display: inline-flex; align-items: center; gap: .5rem;
  transition: transform .35s cubic-bezier(.2,.8,.2,1);
}
.magnet:hover { filter: brightness(1.06); }

/* underline link */
.ul-link { position: relative; display: inline-block; }
.ul-link::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: right center;
  transition: transform .45s cubic-bezier(.2,.85,.2,1);
}
.ul-link:hover::after { transform: scaleX(1); transform-origin: left center; }

/* arrow that slides on hover */
.arrow-pull { display: inline-block; transition: transform .35s cubic-bezier(.2,.85,.2,1); }
a:hover .arrow-pull, button:hover .arrow-pull { transform: translateX(3px); }

/* status dot — 静态柔光，不再脉动 */
.pulse {
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--accent) 18%, transparent);
}

/* terminal caret */
.caret {
  display: inline-block; width: 6px; height: 1em; vertical-align: -2px;
  background: var(--fg);
  margin-left: 2px; animation: caret 1.05s steps(2) infinite;
}
@keyframes caret { 50% { opacity: 0; } }

/* portrait 3D — 点云用 difference 混合，自动反色适应明暗主题 */
.portrait-3d canvas { display: block; mix-blend-mode: difference; }

/* portrait img 切换 — 淡入 + 微缩，给点击反馈 */
.portrait-img { animation: portrait-in .4s cubic-bezier(.2,.8,.2,1); }
@keyframes portrait-in {
  from { opacity: 0; transform: scale(.96); }
  to   { opacity: 1; transform: scale(1); }
}

/* portrait container 响应式宽度：桌面更大，移动保持原值 */
.portrait-fig { max-width: 320px; }
@media (min-width: 1024px) { .portrait-fig { max-width: 460px; } }

/* ───────────────────────────────────────────────────────────
   Community Tag Cloud — 词云：weight 决定字号/字重/颜色
   ─────────────────────────────────────────────────────────── */
.cw-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;             /* 行间 / 列间 */
  align-items: baseline;     /* 不同字号文字基线对齐 */
  position: relative;
}
.cw-tile {
  position: relative;
  display: inline-block;
}
.cw-avatar {
  display: inline-block;
  padding: 2px 4px;
  background: transparent;
  border: none;
  color: var(--fg);
  font-family: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', sans-serif;
  font-style: normal;
  line-height: 1.15;
  white-space: nowrap;
  cursor: pointer;
  letter-spacing: 0;
  transition: color .2s ease, transform .25s ease;
}
.cw-tile:hover .cw-avatar {
  color: var(--accent);
  transform: translateY(-1px);
}

.cw-letter, .cw-label {
  display: inline;
  padding: 0;
  font-style: inherit;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  letter-spacing: inherit;
  text-align: left;
  word-break: normal;
}

/* weight 决定字号 + 字重 + 颜色：1 最小最淡，5 最大最重 */
.cw-w1 .cw-avatar { font-size: 12px; color: var(--muted); font-weight: 400; }
.cw-w2 .cw-avatar { font-size: 15px; color: var(--muted); font-weight: 400; }
.cw-w3 .cw-avatar { font-size: 18px; color: var(--fg);   font-weight: 500; }
.cw-w4 .cw-avatar { font-size: 26px; color: var(--fg);   font-weight: 600; letter-spacing: -.005em; }
.cw-w5 .cw-avatar { font-size: 38px; color: var(--fg);   font-weight: 700; letter-spacing: -.012em; }

@media (max-width: 640px) {
  .cw-w1 .cw-avatar { font-size: 11px; }
  .cw-w2 .cw-avatar { font-size: 13px; }
  .cw-w3 .cw-avatar { font-size: 16px; }
  .cw-w4 .cw-avatar { font-size: 21px; }
  .cw-w5 .cw-avatar { font-size: 28px; }
  .cw-grid { gap: 4px 10px; }
}

/* ── 真·词云 (wordcloud2.js + canvas) ───────────────────────── */
.cw-cloud { width: 100%; min-height: 280px; position: relative; }
.cw-cloud canvas { width: 100%; cursor: pointer; }
.cw-cloud-pop {
  position: absolute;
  pointer-events: none;
  transform: translate(-50%, -100%);
  width: max-content;
  max-width: clamp(220px, 24vw, 300px);
  background: var(--bg);
  border: .5px solid var(--hairline-strong);
  padding: 10px 12px;
  border-radius: 6px;
  box-shadow: 0 18px 40px -18px color-mix(in oklch, var(--fg) 45%, transparent);
  z-index: 30;
  animation: cw-pop-in .15s ease;
}
@keyframes cw-pop-in {
  from { opacity: 0; transform: translate(-50%, -90%); }
  to   { opacity: 1; transform: translate(-50%, -100%); }
}

/* ───────────────────────────────────────────────────────────
   Community Marquee — 双行横向滚动 tag pill
   ─────────────────────────────────────────────────────────── */
.cm-stage {
  position: relative;
  width: 100%;
  padding: 8px 0;
  /* 边缘羽化，不会硬切 */
  -webkit-mask-image: linear-gradient(to right, transparent 0, #000 6%, #000 94%, transparent 100%);
          mask-image: linear-gradient(to right, transparent 0, #000 6%, #000 94%, transparent 100%);
}
.cm-row {
  width: 100%;
  overflow: hidden;
  margin: 8px 0;
}
.cm-track {
  display: inline-flex;
  width: max-content;
  animation: cm-roll 95s linear infinite;
  will-change: transform;
}
.cm-row.cm-reverse .cm-track { animation-direction: reverse; }
/* 三行不同速度，错落感更强；整体慢一档 */
.cm-row.cm-fast .cm-track { animation-duration: 75s; }
.cm-row.cm-slow .cm-track { animation-duration: 120s; }
.cm-stage:hover .cm-track { animation-play-state: paused; }
@keyframes cm-roll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }   /* 一组等宽，移动半个轨道 = 无缝衔接第二组 */
}
.cm-group {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  padding-right: 24px;
}
.cm-pill {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 4px;
  border: none;
  background: transparent;
  font-family: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', sans-serif;
  font-size: clamp(14px, 1.15vw, 16.5px);
  font-weight: 500;
  letter-spacing: 0.005em;
  line-height: 1.2;
  color: var(--fg);
  white-space: nowrap;
  cursor: pointer;
  transition: color .25s ease, transform .3s ease;
}
.cm-pill::before {
  content: "";
  width: 4px; height: 4px;
  border-radius: 50%;
  background: color-mix(in oklch, var(--fg) 28%, transparent);
  flex-shrink: 0;
  transition: background .25s ease, transform .25s ease;
}
.cm-pill:hover {
  color: var(--accent);
  transform: translateY(-1px);
}
.cm-pill:hover::before {
  background: var(--accent);
  transform: scale(1.3);
}
/* 隐藏 brief popup（避免被 marquee 容器/相邻行遮挡） */
.cm-brief { display: none; }
/* hover 浮出 brief */
.cm-brief {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  width: max-content;
  max-width: 280px;
  padding: 10px 12px;
  background: var(--bg);
  border: .5px solid var(--hairline-strong);
  border-radius: 6px;
  color: var(--fg);
  font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
  font-size: 12.5px;
  line-height: 1.5;
  white-space: normal;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 30;
  box-shadow: 0 18px 40px -18px color-mix(in oklch, var(--fg) 45%, transparent);
}
.cm-pill:hover .cm-brief {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ───────────────────────────────────────────────────────────
   Services — 卡片
   ─────────────────────────────────────────────────────────── */
.service-card {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  padding: 26px 22px 22px 22px;
  border: .5px solid var(--hairline);
  border-radius: 4px;
  background: var(--surface);
  color: var(--fg);
  cursor: pointer;
  transition: transform .35s cubic-bezier(.2,.8,.2,1),
              border-color .25s ease, box-shadow .35s ease;
  overflow: hidden;
}
.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--hairline-strong);
  box-shadow: 0 26px 50px -28px color-mix(in oklch, var(--fg) 35%, transparent);
}
.service-num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.service-title {
  margin-top: 18px;
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1;
  letter-spacing: -0.005em;
  color: var(--fg);
}
.service-desc {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--fg);
  min-height: 5em;
}
/* includes / excludes — 能 + 不能 列表 */
.service-list {
  margin: 14px 0 0 0;
  padding: 0;
  list-style: none;
  font-family: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', sans-serif;
  font-size: 13px;
  line-height: 1.55;
  color: var(--fg);
}
.service-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 3px 0;
}
.service-list-mark {
  flex-shrink: 0;
  width: 14px; height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  margin-top: 4px;
}
.service-list-mark-yes { color: var(--accent); }
.service-list-mark-no  { color: color-mix(in oklch, var(--fg) 35%, transparent); }
.service-list-no li { color: color-mix(in oklch, var(--fg) 55%, transparent); }

.service-meta {
  margin-top: 18px;
  padding-top: 14px;
  border-top: .5px solid var(--hairline);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.service-price {
  color: var(--fg);
  font-size: 13px;
  letter-spacing: 0.01em;
}
.service-cta {
  margin-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--fg);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  transition: color .25s ease, transform .25s ease;
}
.service-card:hover .service-cta {
  color: var(--accent);
  transform: translateX(2px);
}

/* 中间 (AI 咨询) 卡片：反色 + 略高一点，靠"对比"emphasis，不靠装饰 */
#services .grid { align-items: stretch; }
#services .grid > :nth-child(2) .service-card {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
  padding: 36px 24px 28px 24px;
  box-shadow: 0 18px 40px -22px color-mix(in oklch, var(--fg) 55%, transparent);
}
/* 内部元素颜色全部反转 */
#services .grid > :nth-child(2) .service-num {
  color: color-mix(in oklch, var(--bg) 55%, transparent);
}
#services .grid > :nth-child(2) .service-title,
#services .grid > :nth-child(2) .service-desc {
  color: var(--bg);
}
#services .grid > :nth-child(2) .service-meta {
  color: color-mix(in oklch, var(--bg) 55%, transparent);
  border-top-color: color-mix(in oklch, var(--bg) 18%, transparent);
}
/* 反色卡里的 + / − list 配色 */
#services .grid > :nth-child(2) .service-list { color: var(--bg); }
#services .grid > :nth-child(2) .service-list-mark-yes { color: var(--accent); }
#services .grid > :nth-child(2) .service-list-mark-no  { color: color-mix(in oklch, var(--bg) 40%, transparent); }
#services .grid > :nth-child(2) .service-list-no li { color: color-mix(in oklch, var(--bg) 55%, transparent); }
#services .grid > :nth-child(2) .service-price { color: var(--bg); }
#services .grid > :nth-child(2) .service-cta {
  color: color-mix(in oklch, var(--bg) 90%, transparent);
}
#services .grid > :nth-child(2) .service-card:hover {
  transform: translateY(-3px);
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 28px 60px -24px color-mix(in oklch, var(--accent) 60%, transparent);
}
#services .grid > :nth-child(2) .service-card:hover .service-cta {
  color: var(--bg);
  transform: translateX(2px);
}
/* hover 时背景变 accent（绿）→ ✓ 必须改回 bg 反色，否则混色看不见 */
#services .grid > :nth-child(2) .service-card:hover .service-list-mark-yes {
  color: var(--bg);
}

/* ── Modal 日期 chip 网格 ───────────────────────────────────── */
.bm-dates {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
  padding: 2px;
}
.bm-date {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 9px 4px 11px 4px;
  border: .5px solid var(--hairline-strong);
  border-radius: 4px;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
  transition: background .2s, color .2s, border-color .2s, transform .2s;
}
.bm-date-wk {
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--muted);
  line-height: 1;
}
.bm-date-num {
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.1;
  margin-top: 5px;
  letter-spacing: 0.005em;
}
.bm-date:hover:not(.on) {
  background: color-mix(in oklch, var(--fg) 6%, transparent);
  border-color: var(--fg);
}
.bm-date.on {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.bm-date.on .bm-date-wk { color: color-mix(in oklch, var(--bg) 65%, transparent); }
.bm-date.today::after {
  content: "";
  position: absolute;
  bottom: 4px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent);
}
.bm-date.on.today::after { background: var(--bg); }

/* ───────────────────────────────────────────────────────────
   Booking Modal
   ─────────────────────────────────────────────────────────── */
.bm-backdrop {
  position: fixed; inset: 0;
  z-index: 200;
  background: color-mix(in oklch, var(--fg) 35%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  animation: bm-fade .25s ease;
}
@keyframes bm-fade { from { opacity: 0; } to { opacity: 1; } }

.bm-dialog {
  position: relative;
  width: 100%;
  max-width: 520px;
  max-height: calc(100vh - 48px);
  overflow: auto;
  background: var(--bg);
  border: .5px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 28px 28px 24px 28px;
  box-shadow: 0 28px 60px -20px color-mix(in oklch, var(--fg) 50%, transparent);
  animation: bm-pop .3s cubic-bezier(.2,.8,.2,1);
  font-family: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', sans-serif;
}
@keyframes bm-pop {
  from { opacity: 0; transform: translateY(12px) scale(.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.bm-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.bm-eyebrow {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.bm-close {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: .5px solid var(--hairline);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  transition: background .2s, border-color .2s, color .2s;
}
.bm-close:hover { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.bm-form { display: flex; flex-direction: column; gap: 18px; }
.bm-row { display: flex; flex-direction: column; gap: 8px; }
.bm-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-family: 'Geist Mono', ui-monospace, monospace;
}
.bm-static {
  font-size: 14px;
  color: var(--fg);
  padding: 10px 0;
  border-bottom: .5px solid var(--hairline);
}
.bm-form input[type="date"],
.bm-form input[type="text"],
.bm-form select,
.bm-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: .5px solid var(--hairline-strong);
  border-radius: 4px;
  background: color-mix(in oklch, var(--bg) 92%, transparent);
  color: var(--fg);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color .2s, background .2s;
}
.bm-form input:focus,
.bm-form select:focus,
.bm-form textarea:focus {
  border-color: var(--accent);
  background: var(--bg);
}
.bm-form textarea { resize: vertical; min-height: 70px; }

.bm-seg { display: flex; gap: 6px; }
.bm-chip {
  flex: 1;
  padding: 9px 12px;
  border: .5px solid var(--hairline-strong);
  border-radius: 4px;
  background: transparent;
  color: var(--fg);
  font-size: 13px;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
}
.bm-chip.on {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.bm-chip:hover:not(.on) {
  background: color-mix(in oklch, var(--fg) 6%, transparent);
}

.bm-contact { display: flex; gap: 8px; }
.bm-contact select { flex: 0 0 auto; width: 100px; }
.bm-contact input { flex: 1; }

/* honeypot 隐藏，但仍可被脚本看到 */
.bm-hp {
  position: absolute;
  left: -10000px; top: -10000px;
  width: 1px; height: 1px;
  overflow: hidden;
}

.bm-error {
  font-size: 12.5px;
  color: oklch(0.55 0.18 25);
  padding: 8px 10px;
  background: color-mix(in oklch, oklch(0.65 0.18 25) 10%, transparent);
  border-radius: 4px;
}

.bm-actions {
  margin-top: 6px;
  display: flex; justify-content: flex-end; gap: 8px;
}
.bm-btn {
  padding: 10px 18px;
  border: .5px solid var(--hairline-strong);
  border-radius: 4px;
  background: transparent;
  color: var(--fg);
  font-family: inherit;
  font-size: 13px;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .2s;
}
.bm-btn:hover { background: color-mix(in oklch, var(--fg) 6%, transparent); }
.bm-btn-primary {
  background: var(--fg); color: var(--bg); border-color: var(--fg);
}
.bm-btn-primary:hover {
  background: var(--accent); border-color: var(--accent); color: var(--bg);
  transform: translateY(-1px);
}
.bm-btn:disabled { opacity: .5; cursor: not-allowed; }

/* 完成态 */
.bm-done { text-align: center; padding: 18px 0 8px; }
.bm-done-mark {
  width: 56px; height: 56px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--accent);
  color: var(--bg);
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 600;
}
.bm-done h4 {
  font-size: clamp(20px, 2vw, 26px);
  margin: 0 0 8px 0;
  color: var(--fg);
}
.bm-done p { font-size: 13.5px; line-height: 1.6; margin: 0 0 22px 0; }
.bm-done .bm-btn { padding: 10px 24px; }

/* hover 浮出 brief 简介 */
.cw-pop {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%) translateY(4px);
  width: max-content;
  max-width: clamp(220px, 24vw, 300px);
  background: var(--bg);
  border: .5px solid var(--hairline-strong);
  padding: 10px 12px;
  border-radius: 6px;
  box-shadow: 0 18px 40px -18px color-mix(in oklch, var(--fg) 45%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  z-index: 30;
}
.cw-tile:hover .cw-pop {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.cw-quote {
  margin: 0;
  font-family: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', sans-serif;
  font-size: 12.5px; line-height: 1.55;
  color: var(--fg);
}
.cw-who {
  display: inline-block;
  margin-top: 6px;
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* ───────────────────────────────────────────────────────────
   Writing — 书堆：默认一本压着一本，hover 抽出当前那本
   ─────────────────────────────────────────────────────────── */
.writing-stack {
  --bw: clamp(300px, 32vw, 400px);    /* 单本宽度（继续放大） */
  --br: 150px;                         /* 默认每本露出多少（越大越不重合） */
  display: flex;
  justify-content: center;             /* 整体水平居中 */
  align-items: flex-start;
  position: relative;
  padding: 30px 0 130px 0;             /* 底部留高给 hover 时露出的 meta */
}
/* hover 时后续兄弟 translateX 让位会撑出 viewport，触发横向滚动；section 横向裁切 */
#writing { overflow-x: clip; }
@supports not (overflow-x: clip) { #writing { overflow-x: hidden; } }
.writing-stack .writing-card {
  flex: 0 0 auto;
  width: var(--bw);
  margin-left: calc(var(--br) - var(--bw));   /* 负值：本卡叠在前一卡上面 */
  position: relative;
  z-index: calc(10 - var(--idx, 0));          /* 越前越上层（默认翻牌堆） */
  transform-origin: bottom center;
  transition: transform .55s cubic-bezier(.2,.8,.2,1), z-index 0s linear .25s;
}
.writing-stack .writing-card:first-child { margin-left: 0; }

/* hover 那本：抬起、置顶；后面的兄弟一起向右让出空间 */
.writing-stack .writing-card:hover {
  z-index: 100;
  transition-delay: 0s;
  transform: translateY(-12px);
}
.writing-stack .writing-card:hover ~ .writing-card {
  transform: translateX(calc(var(--bw) - var(--br)));
}

/* hover 一本书时其他书变灰，突出当前那本 */
.writing-stack:hover .writing-card:not(:hover) {
  filter: grayscale(0.9) brightness(0.95);
}
.writing-stack .writing-card {
  /* 加上 filter / opacity 过渡，配合上面的 transform 过渡 */
  transition: transform .55s cubic-bezier(.2,.8,.2,1),
              z-index 0s linear .25s,
              filter .4s ease,
              opacity .4s ease;
}

/* 悬浮提示：点击跳转公众号文章 */
.writing-tip {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%) translateY(8px);
  padding: 6px 12px;
  background: color-mix(in oklch, var(--bg) 90%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: .5px solid var(--hairline-strong);
  border-radius: 999px;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--fg);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease .05s, transform .3s cubic-bezier(.2,.8,.2,1) .05s;
  z-index: 5;
  box-shadow: 0 6px 16px -8px color-mix(in oklch, var(--fg) 30%, transparent);
}
.writing-card:hover .writing-tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 移动端横屏滚动而不是堆叠（屏幕窄了堆叠看不清） */
@media (max-width: 640px) {
  .writing-stack {
    overflow-x: auto;
    padding-bottom: 24px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
  }
  .writing-stack .writing-card {
    margin-left: 14px;
    scroll-snap-align: start;
  }
  .writing-stack .writing-card:first-child { margin-left: 0; }
  .writing-stack .writing-card:hover { transform: none; }
  .writing-stack .writing-card:hover ~ .writing-card { transform: none; }
}

.writing-card {
  display: block;
  will-change: transform;
}
.writing-cover {
  position: relative;
  overflow: hidden;
  border: .5px solid var(--hairline-strong);
  border-radius: 2px;
  background: var(--surface);
  /* 实体书层叠 —— 右侧 + 底部多层叠加，模拟"一摞纸"的厚度 */
  box-shadow:
    3px 0 0 -0.5px color-mix(in oklch, var(--fg) 30%, transparent),
    6px 0 0 -0.5px color-mix(in oklch, var(--fg) 24%, transparent),
    9px 1px 0 -0.5px color-mix(in oklch, var(--fg) 18%, transparent),
    13px 2px 0 -0.5px color-mix(in oklch, var(--fg) 13%, transparent),
    17px 3px 0 -0.5px color-mix(in oklch, var(--fg) 8%, transparent),
    22px 5px 0 -0.5px color-mix(in oklch, var(--fg) 4%, transparent),
    0 4px 0 -0.5px color-mix(in oklch, var(--fg) 18%, transparent),
    0 7px 0 -0.5px color-mix(in oklch, var(--fg) 12%, transparent),
    0 10px 0 -0.5px color-mix(in oklch, var(--fg) 6%, transparent),
    0 1px 0 0 color-mix(in oklch, var(--fg) 14%, transparent),
    0 18px 36px -18px color-mix(in oklch, var(--fg) 34%, transparent);
  transition: box-shadow .45s ease, border-color .25s ease, transform .45s ease;
}
.writing-cover-img {
  position: relative;
  display: block;
  width: 100%; height: 100%;
  object-fit: contain;          /* 保留完整 2.35:1 横版封面 */
  filter: saturate(0.96) contrast(1.02);
  transition: transform .8s cubic-bezier(.2,.8,.2,1), filter .35s ease;
  z-index: 1;
}
/* 同图模糊放大版 — 填充上下空白，避免空 surface 色块 */
.writing-cover-bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: blur(20px) saturate(0.85);
  transform: scale(1.18);        /* 防止 blur 边缘可见 */
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}
.dark .writing-cover-bg { opacity: 0.45; }
.writing-cover-placeholder {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 10px; letter-spacing: .25em; text-transform: uppercase;
  color: var(--muted);
  background-image:
    repeating-linear-gradient(135deg,
      transparent 0 12px,
      color-mix(in oklch, var(--fg) 6%, transparent) 12px 13px);
}
.writing-no {
  position: absolute;
  top: 12px; right: 12px;
  font-size: 10px;
  letter-spacing: .12em;
  padding: 3px 6px;
  background: color-mix(in oklch, var(--bg) 75%, transparent);
  backdrop-filter: blur(6px);
  border: .5px solid var(--hairline);
  color: var(--fg);
  border-radius: 2px;
}

/* hover 高光 —— 从左到右扫过封面 */
.writing-shine {
  position: absolute;
  top: 0; bottom: 0;
  left: -50%;
  width: 50%;
  background: linear-gradient(
    105deg,
    transparent 0%,
    color-mix(in oklch, #fff 55%, transparent) 45%,
    color-mix(in oklch, #fff 80%, transparent) 50%,
    color-mix(in oklch, #fff 55%, transparent) 55%,
    transparent 100%
  );
  mix-blend-mode: overlay;
  pointer-events: none;
  z-index: 4;
  opacity: 0;
  transition: opacity .25s ease;
}
.writing-card:hover .writing-shine {
  opacity: 1;
  animation: writing-shine-sweep 1.4s cubic-bezier(.2,.8,.2,1) forwards;
}
@keyframes writing-shine-sweep {
  0%   { left: -50%; }
  100% { left: 120%; }
}
/* 书脊：左缘装订侧，14px 多层渐变模拟皮革/布面装订 */
.writing-spine {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 14px;
  background:
    linear-gradient(
      to right,
      color-mix(in oklch, var(--fg) 38%, transparent) 0%,
      color-mix(in oklch, var(--fg) 28%, transparent) 25%,
      color-mix(in oklch, var(--fg) 14%, transparent) 55%,
      color-mix(in oklch, var(--fg) 5%,  transparent) 80%,
      transparent 100%
    ),
    repeating-linear-gradient(
      to bottom,
      transparent 0 4px,
      color-mix(in oklch, var(--fg) 6%, transparent) 4px 4.5px
    );
  border-right: .5px solid color-mix(in oklch, var(--fg) 8%, transparent);
  pointer-events: none;
  z-index: 2;
}
.writing-title {
  color: var(--fg);
  transition: color .25s ease;
  /* 单行省略号，避免堆叠时一团 */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* 默认：每本书的 meta（日期 + 标题）淡出，避免堆叠时彼此压成一团；hover 时单独浮现 */
.writing-meta {
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .35s ease .05s, transform .35s ease .05s;
}
.writing-card:hover .writing-meta {
  opacity: 1;
  transform: translateY(0);
}

/* hover 反馈：阴影抬升 + 封面图微缩放 + 标题变色 */
.writing-card:hover .writing-cover {
  border-color: var(--hairline-strong);
  box-shadow:
    4px 0 0 -0.5px color-mix(in oklch, var(--fg) 34%, transparent),
    8px 0 0 -0.5px color-mix(in oklch, var(--fg) 28%, transparent),
    12px 1px 0 -0.5px color-mix(in oklch, var(--fg) 22%, transparent),
    17px 2px 0 -0.5px color-mix(in oklch, var(--fg) 16%, transparent),
    22px 3px 0 -0.5px color-mix(in oklch, var(--fg) 11%, transparent),
    28px 5px 0 -0.5px color-mix(in oklch, var(--fg) 6%, transparent),
    0 5px 0 -0.5px color-mix(in oklch, var(--fg) 22%, transparent),
    0 8px 0 -0.5px color-mix(in oklch, var(--fg) 15%, transparent),
    0 12px 0 -0.5px color-mix(in oklch, var(--fg) 8%, transparent),
    0 1px 0 0 color-mix(in oklch, var(--fg) 16%, transparent),
    0 34px 70px -28px color-mix(in oklch, var(--fg) 44%, transparent);
}
.writing-card:hover .writing-cover-img {
  transform: scale(1.045);
  filter: saturate(1) contrast(1.04);
}
.writing-card:hover .writing-title { color: var(--accent); }

/* portrait frame corners */
.portrait { position: relative; }
.frame-tl, .frame-br {
  position: absolute; width: 14px; height: 14px;
  border: 1px solid var(--hairline-strong);
}
.frame-tl { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.frame-br { right: -1px; bottom: -1px; border-left: none; border-top: none; }

/* product card watermark */
.card { transition: transform .4s cubic-bezier(.2,.8,.2,1), box-shadow .4s ease, border-color .25s; transform-style: preserve-3d; }
.card:hover { border-color: var(--hairline-strong); box-shadow: 0 30px 70px -45px color-mix(in oklch, var(--fg) 25%, transparent); }
/* 产品卡片右上角小缩略图（16:9，克制存在感） */
.product-thumb {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 144px;
  aspect-ratio: 16 / 9;
  border-radius: 4px;
  border: .5px solid var(--hairline-strong);
  overflow: hidden;
  background: var(--surface);
  box-shadow: 0 6px 14px -8px color-mix(in oklch, var(--fg) 30%, transparent);
  transition: transform .35s cubic-bezier(.2,.8,.2,1),
              border-color .25s ease,
              box-shadow .35s ease;
  z-index: 2;
}
.product-thumb-img {
  display: block;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.96);
  transition: transform .55s cubic-bezier(.2,.8,.2,1), filter .35s ease;
}
.card:hover .product-thumb {
  transform: scale(1.05);
  border-color: var(--accent);
  box-shadow: 0 14px 26px -10px color-mix(in oklch, var(--accent) 40%, transparent);
}
.card:hover .product-thumb-img {
  transform: scale(1.06);
  filter: saturate(1.05);
}
@media (max-width: 768px) {
  .product-thumb { width: 110px; top: 14px; right: 14px; }
}

.watermark {
  position: absolute;
  right: -12px; bottom: -28px;
  font-family: 'Instrument Serif', serif; font-style: italic;
  font-size: clamp(72px, 10vw, 138px); line-height: 1;
  color: color-mix(in oklch, var(--fg) 5%, transparent);
  pointer-events: none; user-select: none;
  letter-spacing: -0.02em;
  transition: color .4s ease;
}
.card:hover .watermark { color: color-mix(in oklch, var(--accent) 16%, transparent); }

/* ───────────────────────────────────────────────────────────
   Product card — stack + reveal animation
   ─────────────────────────────────────────────────────────── */
/* ───────────────────────────────────────────────────────────
   Products — Sticky Pin Layout
   wrap 固定高度；stack 永远 sticky pin 在视口；4 张卡 absolute 居中堆叠
   无论 grid / stack mode 切换，section 高度都不变 → 不会"回退"或"被弹"
   ─────────────────────────────────────────────────────────── */
.product-stack-wrap {
  /* wrap = 1 屏。scroll lock 模式不需要 stick range，彻底消除"无效空白滚动距离" */
  height: 100vh;
  position: relative;
}
@media (max-width: 900px) {
  .product-stack-wrap { height: 100vh; }
}

.product-stack {
  /* absolute fill wrap，stack 完全覆盖 wrap 100vh */
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  /* visible：让 grid mode 卡片切换 translateY 进出动画不被上下边界裁切 */
  overflow: visible;
  padding: 2vh 0;
  z-index: 2;
}

/* === Grid mode：4 张卡 absolute 居中堆叠，由 .active class 控制 crossfade === */
.product-mode-grid .product-stack > .product-reveal {
  position: absolute;
  inset: 4vh 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(56px) scale(0.97);
  filter: blur(4px);
  /* 精致 crossfade：opacity 慢入慢出，transform 略长更柔和，stagger delay 让进入/退出错峰 */
  transition:
    opacity 1.05s cubic-bezier(.4, 0, .2, 1) 80ms,
    transform 1.25s cubic-bezier(.32, .72, .15, 1.0) 60ms,
    filter .85s cubic-bezier(.4, 0, .2, 1) 100ms;
  pointer-events: none;
  will-change: opacity, transform, filter;
}
.product-mode-grid .product-stack > .product-reveal.active {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
  pointer-events: auto;
  z-index: 5;
  /* active 进入时无 delay，立即响应 */
  transition-delay: 0s;
}
/* 已经看过的卡片（DOM 顺序在 active 之前）从上方退出，未看到的（之后）在下方等候 */
.product-mode-grid .product-stack > .product-reveal:has(~ .active) {
  transform: translateY(-56px) scale(0.97);
}

/* 让卡片本体在 sticky pin 视口内能撑开到合理大小 */
.product-mode-grid .product-stack > .product-reveal > .product-card {
  width: min(92vw, 1100px);
  max-height: 92vh;
}

/* === Stack mode：横排扑克牌（覆盖 grid 的 absolute） === */
.product-mode-stack .product-stack {
  /* 不再 full-bleed，stack 留在 wrap 内（受 section padding 限制） */
  position: absolute;
  inset: 0;
  width: auto;
  overflow: visible;
  padding: 0;
}
.product-mode-stack .product-stack > .product-reveal {
  position: relative;
  inset: auto;
  opacity: 1;
  pointer-events: auto;
  filter: blur(0);
  flex: 0 0 auto;
  width: clamp(360px, 32vw, 520px);
  margin-left: clamp(-300px, -20vw, -220px);
  transform-origin: bottom center;
  transform: rotate(var(--card-rot, 0deg)) translateY(var(--card-ty, 0px));
  z-index: var(--card-z, 10);
  transition: z-index 0s linear;
}
.product-mode-stack .product-stack > .product-reveal:first-child {
  margin-left: 0;
}

.product-mode-stack .product-reveal:nth-child(1) { --card-rot: -11deg; --card-ty: 8px;  --card-z: 13; }
.product-mode-stack .product-reveal:nth-child(2) { --card-rot:  -3deg; --card-ty: -4px; --card-z: 12; }
.product-mode-stack .product-reveal:nth-child(3) { --card-rot:   4deg; --card-ty: -2px; --card-z: 11; }
.product-mode-stack .product-reveal:nth-child(4) { --card-rot:  12deg; --card-ty: 10px; --card-z: 10; }

/* hover：保留原始 rotate/translateY，仅把卡片提到上层，不再"转正" */
.product-mode-stack .product-reveal:hover {
  z-index: 100;
}
/* hover 提示气泡：点击跳转网址 */
.product-hover-tip {
  position: absolute;
  top: 50%;
  left: 50%;
  /* 反向 rotate 抵消父卡片旋转，保持 tip 竖直 */
  transform: translate(-50%, -50%) translateY(8px) rotate(calc(-1 * var(--card-rot, 0deg)));
  padding: 9px 16px;
  background: color-mix(in oklch, var(--bg) 92%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: .5px solid var(--hairline-strong);
  border-radius: 999px;
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fg);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .35s cubic-bezier(.2,.85,.2,1);
  z-index: 20;
  box-shadow: 0 6px 18px -8px color-mix(in oklch, var(--fg) 30%, transparent);
  display: none;
}
.product-mode-stack .product-hover-tip {
  display: block;
}
.product-mode-stack .product-card:hover .product-hover-tip {
  opacity: 1;
  transform: translate(-50%, -50%) translateY(0) rotate(calc(-1 * var(--card-rot, 0deg)));
}

/* stack mode 卡片 —— 微妙阴影自然浮在背景上，不强调容器边界 */
.product-mode-stack .product-card {
  box-shadow:
    0 6px 16px -10px color-mix(in oklch, var(--fg) 20%, transparent),
    0 2px 4px -2px color-mix(in oklch, var(--fg) 10%, transparent);
}
.product-mode-stack .product-reveal:hover .product-card {
  box-shadow:
    0 16px 32px -14px color-mix(in oklch, var(--fg) 28%, transparent),
    0 4px 8px -3px color-mix(in oklch, var(--fg) 14%, transparent);
}
.product-mode-stack .product-card .product-viewport { aspect-ratio: 4 / 3; }
/* stack mode：切换显示 4:3 图，object-fit contain 不裁剪 */
.product-mode-stack .product-viewport-img-21 { display: none; }
.product-mode-stack .product-viewport-img-43 {
  display: block;
  object-fit: contain;
  background: var(--surface);
}
.product-mode-stack .product-card:hover .product-viewport-img-43 {
  transform: scale(1.015);
}
.product-mode-stack .product-card .product-body { padding: 16px 18px !important; }
.product-mode-stack .product-card .product-body .relative.mt-5,
.product-mode-stack .product-card .product-body .relative.md\:mt-6 { display: none; }
.product-mode-stack .product-card .watermark { font-size: clamp(48px, 6vw, 76px); }

/* === Mobile 手机端：scroll lock + crossfade（跟桌面 grid mode 同款，1 屏紧凑）=== */
@media (max-width: 768px) {
  /* wrap 77vh — 刚好够装 card 自然高度（chrome+4:3 viewport+body），上下几乎贴合不留空白 */
  .product-stack-wrap {
    height: 77vh !important;
  }
  /* mobile 减小 section 上下 padding（默认 py-24 = 96px 太占空间） */
  #work {
    padding-top: 48px !important;
    padding-bottom: 32px !important;
  }
  /* stack 默认 absolute fill wrap，不要 sticky pin */
  .product-stack,
  .product-mode-grid .product-stack,
  .product-mode-stack .product-stack {
    position: absolute;
    inset: 0;
    display: flex !important;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: auto;
    margin-left: 0;
    overflow: hidden;
    padding: 2vh 0;
    top: auto;
    z-index: 2;
  }
  /* 4 卡 absolute 居中堆叠 crossfade（跟桌面 grid mode 同款） */
  .product-mode-grid .product-stack > .product-reveal,
  .product-mode-stack .product-stack > .product-reveal,
  .product-mode-stack .product-reveal:nth-child(1),
  .product-mode-stack .product-reveal:nth-child(2),
  .product-mode-stack .product-reveal:nth-child(3),
  .product-mode-stack .product-reveal:nth-child(4) {
    position: absolute !important;
    inset: 1vh 5vw;
    display: flex;
    align-items: center;
    justify-content: center;
    width: auto;
    flex: none;
    margin-left: 0;
    transform: translateY(48px) scale(0.96);
    transform-origin: center center;
    opacity: 0 !important;
    filter: blur(4px);
    pointer-events: none;
    z-index: auto;
    transition:
      opacity .55s cubic-bezier(.4,0,.2,1),
      transform .7s cubic-bezier(.32,.72,.15,1.0),
      filter .5s ease;
    --card-rot: 0deg;
    --card-ty: 0px;
  }
  .product-mode-grid .product-stack > .product-reveal.active,
  .product-mode-stack .product-stack > .product-reveal.active {
    opacity: 1 !important;
    transform: translateY(0) scale(1);
    filter: blur(0);
    pointer-events: auto;
    z-index: 5;
  }
  .product-mode-grid .product-stack > .product-reveal:has(~ .active),
  .product-mode-stack .product-stack > .product-reveal:has(~ .active) {
    transform: translateY(-48px) scale(0.96);
  }
  .product-card {
    width: 100% !important;
    /* 不强制 height: 100%，让 card 自然高度，wrap 77vh 刚好够装 */
    height: auto !important;
    max-height: 100%;
    /* 阴影让卡片浮起感更强 */
    box-shadow:
      0 18px 40px -16px color-mix(in oklch, var(--fg) 30%, transparent),
      0 6px 14px -6px color-mix(in oklch, var(--fg) 18%, transparent);
    border-radius: 4px;
  }
  /* mobile 用 4:3 截图（!important 因为 outer "display: none" rule 在 mobile @media 之后定义） */
  .product-viewport-img-21 { display: none !important; }
  .product-viewport-img-43 {
    display: block !important;
    object-fit: cover;
  }
  .product-card .product-viewport,
  .product-mode-stack .product-card .product-viewport { aspect-ratio: 4 / 3; }
  /* 隐藏 hover tip 和 mode 切换按钮（手机不需要） */
  .product-hover-tip { display: none !important; }
  #work .product-mode-toggle { display: none; }
  /* mobile：card 不强制撑满 reveal，让内容自然定 card 高度，reveal flex center 让卡居中 */
  .product-mode-grid .product-stack > .product-reveal > .product-card,
  .product-mode-stack .product-stack > .product-reveal > .product-card {
    height: auto;
    max-height: 100%;
  }
  .product-mode-stack .product-card .product-body { padding: 18px 20px !important; }
  .product-mode-stack .product-card .watermark { display: none; }
  /* mobile 卡片精简：隐藏 meta 编号；保留 kind + tagline + why + footer cta */
  .product-card .product-row-meta {
    display: none !important;
  }
  /* footer visit cta：紧贴 why 下方（不撑底，让卡片自然高度） */
  .product-card .product-row-footer {
    display: flex !important;
    margin-top: 14px !important;
    padding-top: 12px;
    border-top: .5px solid var(--hairline);
    justify-content: center !important;
    font-size: 13px !important;
  }
  .product-card .product-row-footer span {
    color: var(--accent) !important;
    letter-spacing: 0.08em;
  }
  /* tagline 加大加粗 */
  .product-card .product-row-tagline {
    font-size: 16px !important;
    color: var(--fg) !important;
    font-weight: 500;
  }
  /* kind row 紧凑 */
  .product-card .product-row-kind { margin-top: 14px !important; }
  .product-card .product-row-text { margin-top: 10px !important; }
  /* why 显示但限制 2 行（line-clamp），隐藏 "why" eyebrow */
  .product-card .product-row-why {
    margin-top: 8px !important;
    font-size: 12.5px !important;
    line-height: 1.5 !important;
    color: var(--muted);
    display: -webkit-box !important;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .product-card .product-row-why > span:first-child {
    display: none;  /* 隐藏 "why" 小标签，mobile 让正文直接显示 */
  }
}

/* ───────────────────────────────────────────────────────────
   Product card — mock browser frame
   ─────────────────────────────────────────────────────────── */
.product-card .product-browser {
  position: relative;
  width: 100%;
  border-bottom: .5px solid var(--hairline);
  background: var(--surface);
  overflow: hidden;
}
.product-card .product-chrome {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: .5px solid var(--hairline);
  background: color-mix(in oklch, var(--surface) 92%, var(--fg) 8%);
}
.product-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: color-mix(in oklch, var(--fg) 18%, transparent);
  transition: background .35s ease, box-shadow .35s ease;
}
.product-dot + .product-dot { margin-left: -4px; }
.product-card:hover .product-dot:nth-of-type(1) { background: #ff5f57; }
.product-card:hover .product-dot:nth-of-type(2) { background: #febc2e; }
.product-card:hover .product-dot:nth-of-type(3) { background: #28c840; }

.product-urlbar {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  font-size: 11px;
  letter-spacing: 0.01em;
  color: var(--muted);
  background: color-mix(in oklch, var(--surface) 80%, var(--fg) 4%);
  border: .5px solid var(--hairline);
  border-radius: 6px;
  min-width: 0;
  margin-left: 8px;
}
.product-lock {
  font-size: 9px;
  opacity: 0.6;
  filter: grayscale(1);
}
.product-url {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--fg);
}
.product-state-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.product-state-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--p-accent, var(--accent));
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--p-accent, var(--accent)) 18%, transparent);
}

.product-viewport {
  position: relative;
  aspect-ratio: 21 / 9;
  overflow: hidden;
  isolation: isolate;
  background: var(--surface);
}
.product-viewport-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  /* 微妙饱和度调节，让截图融入卡片色调 */
  filter: saturate(0.98);
  transition: transform .6s cubic-bezier(.2,.85,.2,1), filter .35s ease;
}
.product-card:hover .product-viewport-img {
  transform: scale(1.02);
  filter: saturate(1.04);
}
/* 默认隐藏 4:3 版本图，grid mode 用 21:9 */
.product-viewport-img-43 {
  display: none;
}
@media (max-width: 900px) {
  .product-viewport { aspect-ratio: 16 / 9; }
}
.product-viewport-wash {
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 80% at 18% 10%, color-mix(in oklch, var(--p-accent, var(--accent)) 14%, transparent) 0%, transparent 60%),
    radial-gradient(80% 100% at 100% 110%, color-mix(in oklch, var(--p-accent, var(--accent)) 9%, transparent) 0%, transparent 65%),
    var(--surface);
  z-index: 0;
}
.product-viewport-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in oklch, var(--fg) 6%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklch, var(--fg) 6%, transparent) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(120% 80% at 50% 60%, #000 30%, transparent 90%);
  opacity: 0.65;
  z-index: 1;
}
.product-viewport-hero {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px 32px;
  z-index: 2;
  transition: transform .35s cubic-bezier(.2,.8,.2,1);
  will-change: transform;
}
.product-hero-eyebrow {
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}
.product-hero-name {
  font-size: clamp(38px, 5.4vw, 78px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--fg);
  font-style: italic;
  text-shadow: 0 1px 0 color-mix(in oklch, var(--surface) 60%, transparent);
}
.product-hero-tagline {
  margin-top: 12px;
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: color-mix(in oklch, var(--fg) 75%, transparent);
  max-width: 80%;
}
.product-glyph {
  position: absolute;
  right: 18px; bottom: 10px;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1;
  letter-spacing: 0.05em;
  color: color-mix(in oklch, var(--p-accent, var(--accent)) 55%, transparent);
  pointer-events: none;
  user-select: none;
  z-index: 3;
  transition: color .35s ease, transform .5s cubic-bezier(.2,.8,.2,1);
}
.product-card:hover .product-glyph {
  color: var(--p-accent, var(--accent));
  transform: translateY(-4px) rotate(-2deg);
}

@media (max-width: 768px) {
  .product-viewport { aspect-ratio: 16 / 10; }
  .product-hero-name { font-size: clamp(32px, 9vw, 54px); }
  .product-viewport-hero { padding: 20px 22px; }
  .product-glyph { right: 14px; bottom: 8px; }
}

/* easter egg toast */
.ee-toast {
  position: fixed; bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--fg); color: var(--bg);
  padding: 10px 16px; border-radius: 4px; z-index: 70;
  opacity: 0;
  transition: transform .4s cubic-bezier(.2,.8,.2,1), opacity .4s ease;
  font-size: 12px;
}
.ee-toast.in { transform: translateX(-50%) translateY(0); opacity: 1; }

/* contact "hello" letter wave */
.wave-letter {
  display: inline-block;
  animation: wave 4s ease-in-out infinite;
  transform-origin: 50% 80%;
}
@keyframes wave {
  0%, 60%, 100% { transform: translateY(0) rotate(0); }
  20% { transform: translateY(-6px) rotate(-3deg); }
  35% { transform: translateY(0) rotate(2deg); }
}

/* ───────────────────────────────────────────────────────────
   GitHub heatmap cells
   ─────────────────────────────────────────────────────────── */
.hm-cell {
  width: 11px; height: 11px; border-radius: 2px;
  background: color-mix(in oklch, var(--fg) 7%, transparent);
  transition: transform .15s ease, background .25s ease;
}
.hm-cell:hover { transform: scale(1.4); }
.hm-l1 { background: color-mix(in oklch, var(--accent) 25%, color-mix(in oklch, var(--fg) 5%, transparent)); }
.hm-l2 { background: color-mix(in oklch, var(--accent) 50%, color-mix(in oklch, var(--fg) 5%, transparent)); }
.hm-l3 { background: color-mix(in oklch, var(--accent) 75%, color-mix(in oklch, var(--fg) 5%, transparent)); }
.hm-l4 { background: var(--accent); }

/* ───────────────────────────────────────────────────────────
   Tweaks panel
   ─────────────────────────────────────────────────────────── */
.tweaks {
  position: fixed; right: 16px; bottom: 16px; z-index: 65;
  font-family: 'Geist Mono', ui-monospace, monospace; font-size: 11px;
}
.tweaks .panel {
  margin-bottom: 8px;
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border: .5px solid var(--hairline-strong);
  padding: 14px 16px; min-width: 240px;
  border-radius: 4px;
  animation: slideUp .3s cubic-bezier(.2,.8,.2,1);
}
@keyframes slideUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.tweaks .row { display: flex; gap: 6px; align-items: center; margin-top: 8px; }
.tweaks .row .label {
  width: 64px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-size: 10px;
}
.tweaks .seg {
  display: inline-flex; border: .5px solid var(--hairline-strong); border-radius: 3px; overflow: hidden;
}
.tweaks .seg button {
  padding: 4px 8px; background: transparent; color: var(--muted);
  border-left: .5px solid var(--hairline);
  transition: background .2s, color .2s;
}
.tweaks .seg button:first-child { border-left: 0; }
.tweaks .seg button.on { background: var(--fg); color: var(--bg); }
.tweaks .seg button:hover:not(.on) { color: var(--fg); background: color-mix(in oklch, var(--fg) 6%, transparent); }
.tweaks .section-label {
  margin-top: 12px;
  color: var(--muted); text-transform: uppercase; letter-spacing: .12em; font-size: 10px;
  border-top: .5px dashed var(--hairline); padding-top: 8px;
}
.tweaks .section-label:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.tweaks .toggle {
  background: color-mix(in oklch, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  border: .5px solid var(--hairline-strong);
  padding: 7px 12px; border-radius: 4px;
  color: var(--fg);
  transition: background .2s, color .2s;
}
.tweaks .toggle:hover { background: var(--fg); color: var(--bg); }

/* ───────────────────────────────────────────────────────────
   Motion preferences
   ─────────────────────────────────────────────────────────── */
.motion-reduced *, .motion-reduced *::before, .motion-reduced *::after {
  transition-duration: .15s !important; animation-duration: .15s !important;
}
.motion-off *, .motion-off *::before, .motion-off *::after {
  transition: none !important; animation: none !important;
}
.motion-off .reveal { opacity: 1 !important; transform: none !important; }
.motion-off .split-line > span { transform: none !important; }

/* ───────────────────────────────────────────────────────────
   Misc
   ─────────────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
.hairline { border-style: solid; border-width: .5px; }

/* ambient grain (very subtle) */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 90;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 .5 0'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='.45'/></svg>");
  opacity: .035; mix-blend-mode: multiply;
}
.dark body::before { mix-blend-mode: overlay; opacity: .055; }

/* ───────────────────────────────────────────────────────────
   Section permalink chip — 悬停在节标题块淡入「#」按钮，点击复制 deep-link
   ─────────────────────────────────────────────────────────── */
.permalink-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-top: 0.6rem;
  margin-left: 0;
  border: 1px solid var(--hairline-strong);
  border-radius: 5px;
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 13px;
  font-weight: 500;
  font-style: normal;
  letter-spacing: 0;
  line-height: 1;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity .35s cubic-bezier(.2,.85,.2,1),
              transform .35s cubic-bezier(.2,.85,.2,1),
              color .25s ease,
              border-color .25s ease;
}
/* 悬停在所属节标题块时淡入 */
section:hover .permalink-chip,
.permalink-chip:focus-visible {
  opacity: 1;
  transform: translateX(0);
}
.permalink-chip:hover {
  color: var(--accent);
  border-color: var(--accent);
}