/* ==========================================================================
   木石工作室 · 官网样式
   0. 设计令牌  1. 重置与基础  2. 通用元件  3. 导航  4. 首屏
   5. 版面骨架  6. 各区块  7. 页脚与浮标  8. 响应式  9. 动效偏好
   ========================================================================== */

/* ---------- 0. 设计令牌 ---------- */
:root {
  /* 木 = 暖色主调；石 = 冷灰绿副调 */
  --bg:            #F5F2EC;
  --bg-alt:        #FBF9F5;
  --bg-ink:        #17150F;
  --surface:       #FFFFFF;
  --surface-2:     #EFEBE2;
  --ink:           #16140F;
  --ink-2:         #454036;
  --muted:         #7C7568;
  --line:          #DED7C9;
  --line-strong:   #C4B9A4;
  --wood:          #A5652B;
  --wood-hi:       #C4854A;
  --wood-soft:     rgba(165, 101, 43, .12);
  --stone:         #55706A;
  --stone-soft:    rgba(85, 112, 106, .12);
  --shadow-1:      0 1px 2px rgba(28, 24, 16, .06), 0 6px 16px -10px rgba(28, 24, 16, .14);
  --shadow-2:      0 2px 4px rgba(28, 24, 16, .07), 0 22px 44px -22px rgba(28, 24, 16, .26);
  --shadow-inset:  inset 0 1px 0 rgba(255, 255, 255, .7);

  --font-display: "Optima", "Songti SC", "STZhongsong", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", Georgia, serif;
  --font-body:    -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", Roboto, sans-serif;
  --font-mono:    "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  --container: 1180px;
  --gutter: clamp(1.15rem, 4vw, 2.75rem);
  --radius: 14px;
  --radius-lg: 22px;
  --nav-h: 72px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
}

[data-theme="dark"] {
  --bg:            #100F0D;
  --bg-alt:        #15140F;
  --bg-ink:        #080706;
  --surface:       #1B1915;
  --surface-2:     #232019;
  --ink:           #EFEBE1;
  --ink-2:         #C3BCAE;
  --muted:         #8B8477;
  --line:          #2E2A22;
  --line-strong:   #453E32;
  --wood:          #D18F4E;
  --wood-hi:       #E6AC6C;
  --wood-soft:     rgba(209, 143, 78, .14);
  --stone:         #83A29A;
  --stone-soft:    rgba(131, 162, 154, .14);
  --shadow-1:      0 1px 2px rgba(0, 0, 0, .4), 0 8px 20px -12px rgba(0, 0, 0, .6);
  --shadow-2:      0 2px 6px rgba(0, 0, 0, .45), 0 26px 50px -24px rgba(0, 0, 0, .8);
  --shadow-inset:  inset 0 1px 0 rgba(255, 255, 255, .05);
  color-scheme: dark;
}

/* ---------- 1. 重置与基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 18px);
}

body {
  font-family: var(--font-body);
  font-size: clamp(1rem, .96rem + .2vw, 1.0625rem);
  line-height: 1.75;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color .4s var(--ease), color .4s var(--ease);
}

h1, h2, h3, h4 { color: var(--ink); font-family: var(--font-display); font-weight: 600; line-height: 1.22; letter-spacing: .01em; }
p { max-width: 62ch; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
::selection { background: var(--wood); color: #fff; }

:focus-visible {
  outline: 2px solid var(--wood);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed; top: .5rem; left: .5rem; z-index: 200;
  padding: .7rem 1.1rem; background: var(--wood); color: #fff;
  border-radius: 10px; font-weight: 600; transform: translateY(-160%);
  transition: transform .25s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }

/* 滚动进度条需要 body 有高度感，不锁死 */
body.is-locked { overflow: hidden; }

/* ---------- 2. 通用元件 ---------- */
.section { padding-block: clamp(4.5rem, 9vw, 8.5rem); position: relative; }

.band--alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.band--ink { background: var(--bg-ink); color: #B9B2A4; border-block: 1px solid transparent; }
.band--ink h1, .band--ink h2, .band--ink h3 { color: #F2EDE2; }
.band--ink .sec-index { color: var(--wood-hi); }
.band--ink .sec-lede { color: #A9A294; }

.sec-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.sec-head--row { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 3.5rem); align-items: end; }

.sec-index {
  display: flex; align-items: center; gap: .7rem;
  font-family: var(--font-mono); font-size: .78rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--wood); margin-bottom: 1.1rem;
}
.sec-index span { font-weight: 700; }
.sec-index i { display: block; width: clamp(28px, 5vw, 56px); height: 1px; background: currentColor; opacity: .5; }

.sec-title { font-size: clamp(1.85rem, 1.25rem + 2.6vw, 3.15rem); letter-spacing: .02em; }
.sec-title b, .sec-title em { font-style: normal; color: var(--wood); }
.sec-lede { margin-top: 1.2rem; color: var(--muted); font-size: 1.02rem; }

.sec-head .sec-lede:first-of-type { margin-top: 0; }

.text-link {
  display: inline-flex; align-items: center; gap: .35rem;
  color: var(--wood); font-weight: 600; font-size: .94rem;
  border-bottom: 1px solid transparent; transition: border-color .25s, gap .25s;
}
.text-link:hover { border-color: var(--wood); gap: .6rem; }

.btn {
  --btn-bg: var(--surface);
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
  padding: .95rem 1.7rem; border-radius: 999px;
  font-weight: 600; font-size: .97rem; letter-spacing: .02em; white-space: nowrap;
  border: 1px solid var(--line-strong); background: var(--btn-bg); color: var(--ink);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), background-color .28s, border-color .28s, color .28s;
  box-shadow: var(--shadow-1);
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: linear-gradient(160deg, var(--wood-hi), var(--wood));
  border-color: transparent; color: #fff;
  box-shadow: 0 8px 22px -12px rgba(120, 70, 20, .8);
}
.btn--primary:hover { box-shadow: 0 16px 34px -14px rgba(120, 70, 20, .95); }
[data-theme="dark"] .btn--primary { color: #17120C; }

.btn--ghost { background: transparent; border-color: var(--line-strong); box-shadow: none; }
.btn--ghost:hover { background: var(--surface); border-color: var(--wood); color: var(--wood); }

.btn--sm { padding: .6rem 1.15rem; font-size: .88rem; }
.btn--lg { padding: 1.1rem 2.4rem; font-size: 1.05rem; }
.btn--block { width: 100%; }

.band--ink .btn--ghost { border-color: rgba(255,255,255,.22); color: #F2EDE2; }
.band--ink .btn--ghost:hover { background: rgba(255,255,255,.07); border-color: var(--wood-hi); color: var(--wood-hi); }

.icon-btn {
  display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  transition: transform .25s var(--ease), border-color .25s, background-color .25s, color .25s;
}
.icon-btn:hover { transform: translateY(-2px); border-color: var(--wood); color: var(--wood); }
.icon-btn .ico-moon { display: none; }
[data-theme="dark"] .icon-btn .ico-moon { display: block; }
[data-theme="dark"] .icon-btn .ico-sun { display: none; }

/* 进场动画：只在有 JS 时启用，无 JS 直接显示全部内容 */
.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); transition-delay: var(--d, 0s); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 3. 导航 ---------- */
.nav {
  position: fixed; inset: 0 0 auto; z-index: 100; height: var(--nav-h);
  background: var(--bg); /* color-mix 不被支持时的降级：不透明底 */
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background-color .35s var(--ease), border-color .35s, box-shadow .35s;
}
.nav[data-elevated="true"] {
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  border-bottom-color: var(--line);
  box-shadow: 0 8px 26px -22px rgba(0,0,0,.5);
}

.nav__progress { position: absolute; inset: auto 0 0; height: 2px; opacity: 0; transition: opacity .3s; }
.nav[data-elevated="true"] .nav__progress { opacity: 1; }
.nav__progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--wood), var(--stone)); }

.nav__inner { height: 100%; display: flex; align-items: center; gap: 1.5rem; }

.brand { display: inline-flex; align-items: center; gap: .7rem; margin-right: auto; color: var(--ink); }
.brand__mark { display: grid; place-items: center; color: var(--wood); transition: transform .4s var(--ease); }
.brand:hover .brand__mark { transform: rotate(-6deg) scale(1.06); }
.brand__text { display: flex; flex-direction: column; line-height: 1.05; }
.brand__text strong { font-family: var(--font-display); font-size: 1.06rem; letter-spacing: .06em; }
.brand__text em { font-style: normal; font-family: var(--font-mono); font-size: .6rem; letter-spacing: .26em; color: var(--muted); }

.nav__links { display: flex; align-items: center; gap: .3rem; }
.nav__link {
  position: relative; padding: .55rem .85rem; border-radius: 8px;
  font-size: .93rem; color: var(--ink-2); transition: color .25s, background-color .25s;
}
.nav__link::after {
  content: ""; position: absolute; left: .85rem; right: .85rem; bottom: .3rem; height: 2px;
  background: var(--wood); transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease);
}
.nav__link:hover { color: var(--ink); }
.nav__link:hover::after, .nav__link.is-active::after { transform: scaleX(1); }
.nav__link.is-active { color: var(--wood); font-weight: 600; }

.nav__actions { display: flex; align-items: center; gap: .6rem; }
.nav__burger { display: none; }
.burger__box { display: grid; gap: 4px; width: 18px; }
.burger__box span { display: block; height: 2px; background: currentColor; border-radius: 2px; transition: transform .3s var(--ease), opacity .2s; }
.nav__burger[aria-expanded="true"] .burger__box span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav__burger[aria-expanded="true"] .burger__box span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] .burger__box span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 4. 首屏 ---------- */
.hero {
  position: relative; min-height: 100svh; display: flex; align-items: center;
  padding-top: var(--nav-h); padding-bottom: 5rem; overflow: hidden; isolation: isolate;
}
.hero__bg { position: absolute; inset: 0; z-index: -1; }

.hero__grid {
  position: absolute; inset: -20%;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 68px 68px;
  opacity: .38;
  -webkit-mask-image: radial-gradient(ellipse 62% 58% at 50% 42%, #000 20%, transparent 72%);
  mask-image: radial-gradient(ellipse 62% 58% at 50% 42%, #000 20%, transparent 72%);
}
.hero__glow { position: absolute; border-radius: 50%; filter: blur(70px); opacity: .55; }
.hero__glow--wood  { width: 46vw; height: 46vw; top: -8%; right: -6%; background: radial-gradient(circle, var(--wood-soft), transparent 68%); animation: drift 18s var(--ease) infinite alternate; }
.hero__glow--stone { width: 40vw; height: 40vw; bottom: -14%; left: -8%; background: radial-gradient(circle, var(--stone-soft), transparent 68%); animation: drift 22s var(--ease) infinite alternate-reverse; }
@keyframes drift { to { transform: translate3d(-4vw, 3vw, 0) scale(1.12); } }

.hero__mark {
  position: absolute; font-family: var(--font-display); font-weight: 600;
  color: var(--ink); opacity: .045; line-height: 1; user-select: none;
}
.hero__mark--mu  { font-size: clamp(14rem, 34vw, 30rem); right: -1%; top: 4%; }
.hero__mark--shi { font-size: clamp(10rem, 24vw, 22rem); left: -2%; bottom: -4%; }

.hero__spot {
  position: absolute; width: 520px; height: 520px; margin: -260px 0 0 -260px; border-radius: 50%;
  background: radial-gradient(circle, var(--wood-soft), transparent 62%);
  opacity: 0; transition: opacity .5s; pointer-events: none;
}
.hero__noise { position: absolute; inset: 0; background-image: var(--grain); opacity: .035; mix-blend-mode: multiply; pointer-events: none; }
[data-theme="dark"] .hero__noise { mix-blend-mode: screen; opacity: .05; }

.hero__inner { position: relative; display: flex; flex-direction: column; align-items: flex-start; }

.hero__eyebrow {
  display: inline-flex; align-items: center; gap: .6rem; margin-bottom: 1.7rem;
  padding: .45rem 1rem .45rem .8rem; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow-1);
  font-size: .84rem; color: var(--ink-2); letter-spacing: .04em;
}
.pulse { position: relative; width: 8px; height: 8px; border-radius: 50%; background: #4CA268; }
.pulse::after { content: ""; position: absolute; inset: 0; border-radius: 50%; background: inherit; animation: ping 2.4s var(--ease) infinite; }
@keyframes ping { 0% { transform: scale(1); opacity: .7; } 80%, 100% { transform: scale(3); opacity: 0; } }

.hero__title {
  font-size: clamp(2.6rem, 1.4rem + 6.6vw, 6.4rem);
  letter-spacing: .03em; margin-bottom: 1.6rem;
}
.hero__title .line { display: block; }
.hero__title b { font-weight: 600; color: var(--wood); position: relative; }
.hero__title b::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: .12em; height: .09em;
  background: var(--stone); opacity: .3; border-radius: 2px;
}

.hero__desc { font-size: clamp(1rem, .95rem + .35vw, 1.16rem); color: var(--muted); margin-bottom: 2.4rem; max-width: 46ch; }

.hero__actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-bottom: clamp(2.5rem, 6vw, 4rem); }

.hero__stats { display: flex; flex-wrap: wrap; gap: clamp(1.5rem, 5vw, 3.5rem); padding-top: 1.6rem; border-top: 1px solid var(--line); }
.hero__stats div { min-width: 92px; }
.hero__stats dt { font-family: var(--font-display); font-size: clamp(1.7rem, 1.2rem + 1.6vw, 2.5rem); font-weight: 600; color: var(--ink); line-height: 1.1; font-variant-numeric: tabular-nums; }
.hero__stats dd { font-size: .82rem; color: var(--muted); letter-spacing: .08em; margin-top: .3rem; }

.hero__scroll {
  position: absolute; left: 50%; bottom: 1.9rem; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .55rem;
  font-family: var(--font-mono); font-size: .62rem; letter-spacing: .3em; color: var(--muted);
  transition: color .3s;
}
.hero__scroll:hover { color: var(--wood); }
.hero__scroll span { display: block; width: 1px; height: 42px; background: linear-gradient(var(--line-strong), transparent); position: relative; overflow: hidden; }
.hero__scroll span::after { content: ""; position: absolute; inset: 0 auto auto; width: 1px; height: 14px; background: var(--wood); animation: fall 2.2s var(--ease) infinite; }
@keyframes fall { 0% { transform: translateY(-16px); } 60%, 100% { transform: translateY(44px); } }

/* 滚动条带 */
.marquee { overflow: hidden; border-block: 1px solid var(--line); background: var(--bg-alt); padding-block: .95rem; }
.marquee__track { display: flex; align-items: center; gap: 2.2rem; width: max-content; animation: slide 32s linear infinite; }
.marquee__track span { font-family: var(--font-display); font-size: 1rem; letter-spacing: .16em; color: var(--muted); white-space: nowrap; }
.marquee__track i { color: var(--wood); font-size: .5rem; opacity: .55; font-style: normal; }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes slide { to { transform: translateX(-50%); } }

/* ---------- 5. 版面骨架：分栏 + 粘性 ---------- */
.grid-split { display: grid; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
.grid-split--reverse { grid-template-columns: minmax(0, 1fr) minmax(0, 400px); }
.split__sticky { position: sticky; top: calc(var(--nav-h) + 2rem); }

.panel {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 2rem 1.8rem; box-shadow: var(--shadow-2); position: relative; overflow: hidden;
}
.panel::before { content: ""; position: absolute; inset: 0 0 auto; height: 3px; background: linear-gradient(90deg, var(--wood), var(--stone)); }
.panel__mark { color: var(--wood); margin-bottom: 1rem; }
.panel__title { font-size: 1.5rem; }
.panel__sub { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .2em; color: var(--muted); margin: .35rem 0 1.5rem; }
.panel__list { display: grid; gap: .75rem; margin-bottom: 1.5rem; }
.panel__list li { display: flex; gap: .8rem; font-size: .9rem; align-items: baseline; }
.panel__list .k { flex: 0 0 3.6em; color: var(--muted); font-size: .82rem; }
.panel__list .v { color: var(--ink); font-weight: 500; }
.panel__list b { font-family: var(--font-mono); font-weight: 500; color: var(--wood); font-variant-numeric: tabular-nums; }

.prose p { font-size: 1.04rem; color: var(--ink-2); }
.prose p + p { margin-top: 1.15rem; }
.prose b { color: var(--ink); font-weight: 600; }

.quote {
  margin: 2.4rem 0; padding: 1.4rem 0 1.4rem 1.6rem; border-left: 2px solid var(--wood);
  background: linear-gradient(90deg, var(--wood-soft), transparent 70%); border-radius: 0 12px 12px 0;
}
.quote p { font-family: var(--font-display); font-size: clamp(1.2rem, 1rem + 1vw, 1.6rem); color: var(--ink); }
.quote cite { display: block; margin-top: .6rem; font-style: normal; font-size: .84rem; color: var(--muted); }

.traits { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin-top: 2.4rem; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.traits li { background: var(--bg); padding: 1.4rem 1.2rem; }
.band--alt .traits li { background: var(--bg-alt); }
.traits strong { display: block; font-family: var(--font-display); font-size: 1.12rem; color: var(--wood); margin-bottom: .4rem; }
.traits span { font-size: .9rem; color: var(--muted); line-height: 1.6; }

/* ---------- 6. 各区块 ---------- */
/* 能力卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.15rem; }
.card {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 1.9rem 1.7rem; box-shadow: var(--shadow-1);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s;
  overflow: hidden;
}
.card::after {
  content: ""; position: absolute; width: 180px; height: 180px; right: -70px; top: -70px; border-radius: 50%;
  background: radial-gradient(circle, var(--wood-soft), transparent 70%);
  opacity: 0; transition: opacity .4s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-2); border-color: var(--line-strong); }
.card:hover::after { opacity: 1; }
.card__ico {
  display: grid; place-items: center; width: 46px; height: 46px; border-radius: 13px; margin-bottom: 1.15rem;
  background: var(--wood-soft); color: var(--wood);
  border: 1px solid var(--line);
  border: 1px solid color-mix(in srgb, var(--wood) 22%, transparent);
  transition: transform .4s var(--ease);
}
.card:hover .card__ico { transform: rotate(-8deg) scale(1.06); }
.card h3 { font-size: 1.22rem; margin-bottom: .6rem; }
.card p { font-size: .93rem; color: var(--muted); line-height: 1.72; position: relative; }
.card__tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1.15rem; }
.card__tags li {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .04em;
  padding: .25rem .6rem; border-radius: 6px; background: var(--surface-2); color: var(--ink-2); border: 1px solid var(--line);
}

/* 方式步骤 */
.steps { display: grid; gap: 0; counter-reset: s; margin-top: 1rem; }
.step {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: clamp(1.2rem, 3vw, 2.4rem);
  padding: 1.9rem 0; border-top: 1px solid rgba(255, 255, 255, .1); position: relative;
  transition: padding-left .4s var(--ease);
}
.step:last-child { border-bottom: 1px solid rgba(255, 255, 255, .1); }
.step:hover { padding-left: .8rem; }
.step__no {
  font-family: var(--font-mono); font-size: .82rem; letter-spacing: .1em; color: var(--wood-hi);
  padding-top: .35rem; min-width: 2.6rem;
}
.step h3 { font-size: 1.3rem; margin-bottom: .45rem; }
.step p { font-size: .95rem; color: #A79F90; max-width: 58ch; }
.step::after {
  content: ""; position: absolute; left: 0; top: -1px; height: 1px; width: 0;
  background: var(--wood-hi); transition: width .55s var(--ease);
}
.step:hover::after { width: 100%; }

/* 技术栈 */
.stacks { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.9rem 2.5rem; }
.stack h3 { display: flex; align-items: center; gap: .6rem; font-size: 1.05rem; margin-bottom: 1rem; padding-bottom: .7rem; border-bottom: 1px solid var(--line); }
.stack__dot { width: 8px; height: 8px; border-radius: 2px; background: var(--stone); transform: rotate(45deg); }
.stack ul { display: flex; flex-wrap: wrap; gap: .5rem; }
.stack li {
  padding: .4rem .9rem; border-radius: 999px; border: 1px solid var(--line); background: var(--surface);
  font-size: .86rem; color: var(--ink-2); transition: all .3s var(--ease);
}
.stack li:hover { border-color: var(--wood); color: var(--wood); transform: translateY(-2px); box-shadow: var(--shadow-1); }

/* 联系 */
.channels { display: grid; gap: 0; margin-top: 2rem; border-top: 1px solid var(--line); }
.channels li { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); gap: 1rem; align-items: center; padding: 1rem .2rem; border-bottom: 1px solid var(--line); transition: padding-left .3s var(--ease), background-color .3s; }
.channels li:hover { padding-left: .8rem; background: var(--surface); }
.channels__k { font-size: .82rem; color: var(--muted); letter-spacing: .08em; }
.channels__v { color: var(--ink); font-weight: 500; font-size: .97rem; }
.channels__v--btn { display: inline-flex; align-items: center; gap: .5rem; font-family: inherit; transition: color .25s; }
.channels__v--btn svg { opacity: .45; transition: opacity .25s; }
.channels__v--btn:hover { color: var(--wood); }
.channels__v--btn:hover svg { opacity: 1; }
.channels__v--btn.is-copied { color: #4CA268; }

.form { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: clamp(1.6rem, 3vw, 2.2rem); box-shadow: var(--shadow-2); }
/* 蜜罐字段：移出可视区域但保留在无障碍树之外，脚本仍会按 name 填写 */
.hp { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; opacity: 0; pointer-events: none; }
.form__title { font-size: 1.45rem; }
.form__sub { font-size: .88rem; color: var(--muted); margin: .35rem 0 1.6rem; }

.field { margin-bottom: 1.15rem; }
.field label { display: block; font-size: .85rem; color: var(--ink-2); margin-bottom: .45rem; letter-spacing: .03em; }
.req { color: var(--wood); }
.field input, .field textarea, .select select {
  width: 100%; padding: .8rem .95rem; border-radius: 11px;
  border: 1px solid var(--line); background: var(--bg-alt); color: var(--ink);
  transition: border-color .25s, box-shadow .25s, background-color .25s;
}
.field textarea { resize: vertical; min-height: 120px; line-height: 1.7; }
.field input::placeholder, .field textarea::placeholder { color: var(--muted); opacity: .75; }
.field input:hover, .field textarea:hover { border-color: var(--line-strong); }
.field input:focus, .field textarea:focus, .select select:focus {
  outline: none; border-color: var(--wood); background: var(--surface);
  box-shadow: 0 0 0 3px var(--wood-soft);
}
.field.is-error input, .field.is-error textarea, .field.is-error select { border-color: #C0522F; box-shadow: 0 0 0 3px rgba(192, 82, 47, .12); }
.field__hint { font-size: .78rem; color: var(--muted); margin-top: .4rem; min-height: 1.1em; }
.hint__err:empty { display: none; }
.hint__err { display: block; margin-bottom: .15rem; }
.field.is-error .field__hint, .field.is-error .hint__err { color: #C0522F; }

.select { position: relative; }
.select select { appearance: none; -webkit-appearance: none; padding-right: 2.4rem; cursor: pointer; }
.select svg { position: absolute; right: .9rem; top: 50%; transform: translateY(-50%); pointer-events: none; color: var(--muted); }

.form__status { min-height: 1.4em; font-size: .86rem; margin-top: .9rem; }
.form__status.is-ok { color: #4CA268; }
.form__status.is-err { color: #C0522F; }
.form__note { font-size: .76rem; color: var(--muted); margin-top: .3rem; }
.form.is-busy .btn--primary { opacity: .65; pointer-events: none; }

/* 收尾 */
.cta-band { position: relative; padding-block: clamp(4.5rem, 10vw, 8rem); text-align: center; overflow: hidden; background: var(--bg-alt); border-top: 1px solid var(--line); }
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 70% at 50% 120%, var(--wood-soft), transparent 70%);
}
.cta-band > .container { position: relative; display: grid; justify-items: center; gap: 1.1rem; }
.cta-band__title { font-size: clamp(1.9rem, 1.3rem + 2.8vw, 3.4rem); }
.cta-band__sub { color: var(--muted); font-size: 1rem; }
.cta-band .btn { margin-top: .9rem; }

/* ---------- 7. 页脚与浮标 ---------- */
.foot { background: var(--bg-ink); color: #97907F; padding-block: 3.2rem 2rem; }
.foot__inner { display: grid; grid-template-columns: minmax(0, 1.3fr) auto; gap: 2.5rem; align-items: start; }
.foot__brand { display: flex; gap: .9rem; align-items: flex-start; }
.foot__brand .brand__mark { color: var(--wood-hi); flex: 0 0 auto; padding-top: .15rem; }
.foot__brand strong { display: block; font-family: var(--font-display); font-size: 1.15rem; color: #F0EADF; letter-spacing: .05em; }
.foot__brand p { font-size: .87rem; margin-top: .25rem; }
.foot__nav { display: flex; flex-wrap: wrap; gap: .3rem 1.3rem; }
.foot__nav a { font-size: .88rem; padding: .3rem 0; transition: color .25s; }
.foot__nav a:hover { color: var(--wood-hi); }
.foot__meta { grid-column: 1 / -1; padding-top: 1.6rem; margin-top: .6rem; border-top: 1px solid rgba(255, 255, 255, .09); display: flex; flex-wrap: wrap; gap: .3rem 1.5rem; justify-content: space-between; font-size: .8rem; }
.foot__sub { opacity: .7; }

.totop {
  position: fixed; right: clamp(1rem, 3vw, 2rem); bottom: clamp(1rem, 3vw, 2rem); z-index: 90;
  width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center;
  background: var(--surface); color: var(--ink); border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-2); transition: transform .3s var(--ease), color .3s, border-color .3s, opacity .3s;
}
.totop:hover { transform: translateY(-4px); color: var(--wood); border-color: var(--wood); }
.totop[hidden] { display: none; }

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid-split, .grid-split--reverse { grid-template-columns: minmax(0, 1fr); }
  .split__sticky { position: static; }
  .grid-split--reverse .split__sticky { order: 2; }
  .grid-split--reverse .split__flow { order: 1; }
  .sec-head--row { grid-template-columns: 1fr; align-items: start; }
}

@media (max-width: 860px) {
  :root { --nav-h: 64px; }
  .nav__cta { display: none; }
  .nav__burger { display: grid; }
  .nav__links {
    /* 绝对定位挂在导航条下沿：父级 .nav 有 backdrop-filter，fixed 会失效，必须用 absolute */
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line); padding: .6rem var(--gutter) 1.4rem;
    box-shadow: var(--shadow-2);
    max-height: calc(100dvh - var(--nav-h)); overflow-y: auto;
    opacity: 0; visibility: hidden; transform: translateY(-10px);
    transition: opacity .3s var(--ease), transform .35s var(--ease), visibility .35s;
  }
  .nav__links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav__link { padding: 1rem .2rem; font-size: 1.05rem; border-bottom: 1px solid var(--line); }
  .nav__link::after { display: none; }
  .nav__link.is-active { color: var(--wood); }
  .traits { grid-template-columns: 1fr; }
  .hero__stats { gap: 1.2rem 2rem; }
}

@media (max-width: 620px) {
  .step { grid-template-columns: minmax(0, 1fr); gap: .5rem; }
  .channels li { grid-template-columns: 4.5rem minmax(0, 1fr); }
  .hero__title { letter-spacing: .01em; }
  .hero__scroll { display: none; }
  .btn { padding: .9rem 1.5rem; }
  .foot__inner { grid-template-columns: 1fr; }
}

@media (max-width: 380px) {
  .hero__actions { width: 100%; }
  .hero__actions .btn { flex: 1 1 100%; }
}

/* ---------- 9. 动效偏好与打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .js .reveal { opacity: 1 !important; transform: none !important; }
  .marquee__track { animation: none; }
}

@media print {
  .nav, .totop, .hero__bg, .marquee, .hero__scroll { display: none !important; }
  body { background: #fff; color: #000; }
  .section { padding-block: 1.5rem; }
  .band--ink { background: #fff; color: #000; }
  .band--ink h1, .band--ink h2, .band--ink h3 { color: #000; }
}