/* ============================================================
   林川工作室 · Lin Chuan Studio
   设计方向：纯白 · 扁平化 · 卡片式
   字体：Fraunces（展示衬线）/ Inter（正文）/ JetBrains Mono（标签）
   原则：无阴影、无渐变、纯色块 + 边框定义层次
   ============================================================ */

/* ---------- 设计 Tokens ---------- */
:root {
  /* 颜色 — 纯白底 + 中性灰阶 + 单色强调 */
  --bg:            #FFFFFF;
  --bg-soft:       #FAFAF8;       /* 极浅暖灰，用于卡片底色 */
  --bg-tint:       #F4F3EF;       /* 略深一档，用于分区 */
  --surface:       #FFFFFF;
  --surface-2:     #FAFAF8;

  --border:        #E8E6E0;       /* 主边框 */
  --border-strong: #1A1A1A;      /* 强调边框（卡片悬停等） */
  --border-subtle: #F0EEE8;

  --text:          #0A0A0A;       /* 近黑主文字 */
  --text-secondary:#525252;       /* 次要文字 */
  --text-muted:    #6B6B6B;       /* 弱化文字 — 对比度 ≥ 4.5:1 (WCAG AA) */
  --text-dim:      #9A9A9A;       /* 装饰性文字 — 仅用于非信息性元素 */

  --accent:        #0A0A0A;       /* 扁平化：用纯黑作强调 */
  --accent-hover:  #2A2A2A;
  --accent-soft:   #F4F3EF;
  --accent-line:   #0A0A0A;

  --tag-bg:        #F4F3EF;
  --tag-border:    #E8E6E0;

  /* 字体 */
  --font-display: "Fraunces", "Songti SC", Georgia, serif;
  --font-body:    "Inter", "PingFang SC", -apple-system, system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", "SF Mono", Consolas, monospace;

  /* 间距尺度 — 8px 基础 */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;
  --space-8:  64px;
  --space-9:  96px;
  --space-10: 128px;

  /* 容器 */
  --container: 1200px;
  --container-narrow: 880px;
  --gutter: clamp(20px, 5vw, 56px);

  /* 圆角 — 扁平化用小圆角 */
  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 12px;

  /* 动效 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 140ms;
  --dur: 220ms;
  --dur-slow: 480ms;

  /* 字号阶梯 */
  --fs-eyebrow: 0.72rem;
  --fs-body:    1rem;
  --fs-lede:    clamp(1.05rem, 0.98rem + 0.3vw, 1.18rem);
  --fs-h3:      clamp(1.4rem, 1.2rem + 0.8vw, 1.85rem);
  --fs-h2:      clamp(2rem, 1.5rem + 2vw, 3rem);
  --fs-hero:    clamp(2.6rem, 1.8rem + 3.6vw, 4.6rem);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html:focus-within { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv01", "cv11";
  min-height: 100vh;
}

img, picture, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
ul, ol { list-style: none; padding: 0; }

::selection { background: var(--accent); color: var(--bg); }

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

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  transition: top var(--dur-fast) var(--ease-out);
  z-index: 100;
}
.skip-link:focus { top: 16px; }

/* ---------- 顶部状态条 ---------- */
.status-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 8px var(--gutter);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.status-bar__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
}
.status-bar__line {
  flex: 1;
  height: 1px;
  background: var(--border);
}
.status-bar__text--mono { color: var(--text-dim); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand__mark {
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  color: var(--bg);
  background: var(--accent);
  border-radius: var(--radius-sm);
  transition: background var(--dur) var(--ease-out);
}
.brand:hover .brand__mark {
  background: var(--accent-hover);
}
.brand__name { display: flex; flex-direction: column; line-height: 1.15; }
.brand__zh { font-size: 0.95rem; font-weight: 500; color: var(--text); }
.brand__en {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.nav__links a {
  color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease-out);
}
.nav__links a:not(.nav__cta):hover { color: var(--text); }
.nav__cta {
  padding: 8px 14px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--bg) !important;
  background: var(--accent);
  transition: background var(--dur) var(--ease-out);
}
.nav__cta:hover {
  background: var(--accent-hover);
}

/* ---------- 通用 Section ---------- */
.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(72px, 12vh, 140px) var(--gutter);
}
.section__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(40px, 6vw, 72px);
  max-width: 720px;
}
.section__index {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}
.section__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-h2);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variation-settings: "opsz" 96;
}
.section__desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  max-width: 56ch;
}
.section__em { color: var(--text); font-style: italic; font-family: var(--font-display); font-weight: 500; }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(56px, 9vh, 110px) var(--gutter) clamp(72px, 12vh, 140px);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}
.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}
.hero__index { color: var(--text); font-weight: 500; }
.hero__sep { color: var(--border); }

.hero__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-hero);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--text);
  font-variation-settings: "opsz" 144;
  margin-bottom: 32px;
}
.hero__title-accent em {
  font-style: italic;
  font-weight: 500;
  color: var(--text);
  font-variation-settings: "opsz" 144;
}

.hero__lede {
  font-size: var(--fs-lede);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 52ch;
  margin-bottom: 40px;
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 0;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}
.hero__meta-item {
  padding-right: 28px;
  border-right: 1px solid var(--border);
}
.hero__meta-item:not(:first-child) { padding-left: 28px; }
.hero__meta-item:last-child { border-right: none; padding-right: 0; }
.hero__meta-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.hero__meta-value {
  font-size: 0.92rem;
  color: var(--text);
  font-weight: 500;
  line-height: 1.4;
  word-break: keep-all;
}

/* Hero 终端 — 扁平化为代码块 */
.hero__aside { position: relative; }
.hero__terminal {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-mono);
}
.hero__terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--bg-tint);
  border-bottom: 1px solid var(--border);
}
.hero__terminal-bar span {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--border);
}
.hero__terminal-title {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--text-muted);
  width: auto; height: auto;
  background: none;
  border-radius: 0;
}
.hero__terminal-body {
  padding: 20px 22px;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--text-secondary);
  white-space: pre;
  overflow-x: auto;
}
.hero__terminal-body code { font-family: inherit; }
.t-comment { color: var(--text-dim); }
.t-prompt  { color: var(--text); font-weight: 500; }
.t-cmd     { color: var(--text); }
.t-cursor  { color: var(--text); animation: blink 1.1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- 作品网格 ---------- */
.work-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 24px);
}

/* 精选案例 section 顶部边框（统一节奏） */
#work.section {
  border-top: 1px solid var(--border);
}

/* 工具栈 section 顶部边框 */
#stack.section {
  border-top: 1px solid var(--border);
}

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition:
    border-color var(--dur) var(--ease-out),
    background var(--dur) var(--ease-out);
}
.card__link {
  display: block;
  height: 100%;
  color: inherit;
}
.card:hover {
  border-color: var(--accent);
}
.card:focus-within {
  border-color: var(--accent);
}

/* 网格定位 */
.card--featured { grid-column: span 6; }
.card--code     { grid-column: span 3; }
.card--metric   { grid-column: span 3; }
.card--compact  { grid-column: span 3; }
.card--text     { grid-column: span 3; }

/* 特色卡片横向布局 */
.card--featured .card__link {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  align-items: stretch;
}
.card--featured .card__media {
  border-right: 1px solid var(--border);
  min-height: 340px;
}
.card--featured .card__body {
  padding: clamp(28px, 3vw, 44px);
  display: flex;
  flex-direction: column;
}

/* 普通卡片纵向 */
.card--code .card__link,
.card--metric .card__link,
.card--compact .card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.card--code .card__media,
.card--metric .card__media,
.card--compact .card__media {
  border-bottom: 1px solid var(--border);
}
.card--code .card__body,
.card--metric .card__body,
.card--compact .card__body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

/* 文字卡 */
.card--text .card__body--text {
  padding: 32px;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 320px;
  background: var(--bg-soft);
  position: relative;
}
.card--text .card__body--text::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--text);
}

/* 卡片头部 */
.card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  gap: 12px;
}
.card__head-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.card__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}
.card__year {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}
.card__tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--tag-border);
  background: var(--tag-bg);
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.card__tag--accent {
  color: var(--bg);
  border-color: var(--accent);
  background: var(--accent);
}
.card__tag--muted {
  color: var(--text-secondary);
  border-color: var(--border);
  background: var(--bg-soft);
}

.card__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--fs-h3);
  letter-spacing: -0.015em;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 6px;
  font-variation-settings: "opsz" 48;
}
.card__subtitle {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-weight: 500;
}
.card--featured .card__subtitle,
.card--code .card__subtitle,
.card--metric .card__subtitle,
.card--compact .card__subtitle {
  color: var(--text-secondary);
}
.card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* 卡片事实清单 */
.card__facts {
  display: grid;
  gap: 8px;
  margin-top: auto;
  margin-bottom: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}
.card__facts li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.8rem;
}
.card__facts li span:first-child {
  font-family: var(--font-mono);
  color: var(--text-muted);
  flex-shrink: 0;
}
.card__facts li span:last-child {
  color: var(--text);
  text-align: right;
}

.card__cta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  margin-top: auto;
  transition: gap var(--dur) var(--ease-out);
}
.card:hover .card__cta { gap: 12px; }

/* 引用 */
.card__quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text);
  padding: 16px 0 16px 16px;
  border-left: 2px solid var(--text);
  margin-bottom: 20px;
  font-variation-settings: "opsz" 24;
}

/* ---------- Media mockups — 全部扁平化 ---------- */
.card__media {
  background: var(--bg-soft);
  position: relative;
  overflow: hidden;
}

/* 1) 编辑器 mockup — Lumen */
.card__media--editor {
  background: var(--bg-soft);
  padding: 24px;
  display: flex;
  align-items: center;
}
.editor-mock {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.editor-mock__toolbar {
  display: flex;
  gap: 4px;
  padding: 8px 12px;
  background: var(--bg-tint);
  border-bottom: 1px solid var(--border);
}
.editor-mock__tab {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}
.editor-mock__tab--active {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.editor-mock__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 220px;
}
.editor-mock__pane {
  padding: 16px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
}
.editor-mock__pane--src {
  border-right: 1px solid var(--border);
  color: var(--text-secondary);
}
.editor-mock__pane--src .ln { display: block; }
.editor-mock__pane--src .k { color: var(--text); font-weight: 500; }
.editor-mock__pane--preview {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text);
  background: var(--bg-soft);
}
.pv-h1 {
  display: block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--text);
}
.pv-h2 {
  display: block;
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text);
  margin: 10px 0 4px;
}
.pv-p {
  display: block;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.pv-ul { display: block; padding-left: 12px; }
.pv-li {
  display: block;
  position: relative;
  padding-left: 14px;
  color: var(--text-muted);
}
.pv-li::before {
  content: "○";
  position: absolute;
  left: 0;
  color: var(--text-dim);
}
.pv-li--done { color: var(--text); }
.pv-li--done::before { content: "✓"; color: var(--text); }

/* 2) 终端 mockup — Tide */
.card__media--terminal {
  padding: 24px;
  background: var(--bg-soft);
}
.term-mock {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.term-mock__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--bg-tint);
  border-bottom: 1px solid var(--border);
}
.term-mock__dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--border);
}
.term-mock__dot:nth-child(1),
.term-mock__dot:nth-child(2),
.term-mock__dot:nth-child(3) { background: var(--border); }
.term-mock__title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}
.term-mock__body {
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.8;
  color: var(--text-secondary);
  white-space: pre;
  overflow-x: auto;
}
.term-mock__body .t-ok { color: var(--text); font-weight: 500; }
.term-mock__body .t-dim { color: var(--text-muted); }

/* 3) 指标 mockup — Atlas */
.card__media--metrics {
  padding: 24px;
  background: var(--bg-soft);
}
.metric-mock {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.metric-mock__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.metric-mock__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
}
.metric-mock__ver {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}
.metric-mock__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 12px;
  margin-bottom: 20px;
}
.metric-mock__cell {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.metric-mock__num {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.6rem;
  color: var(--text);
  line-height: 1;
  font-variation-settings: "opsz" 48;
}
.metric-mock__sub {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.metric-mock__chart {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 48px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.metric-mock__chart span {
  flex: 1;
  background: var(--text);
  min-height: 4px;
}

/* 4) App mockup — Halftone */
.card__media--app {
  padding: 24px;
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.app-mock__window {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.app-mock__titlebar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg-tint);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
}
.app-mock__controls { color: var(--text-muted); letter-spacing: 2px; }
.app-mock__canvas {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 14px;
}
.app-mock__thumb {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-sm);
  background-size: cover;
  background-position: center;
}
.app-mock__thumb--a {
  background:
    radial-gradient(circle at 30% 40%, #C9A35A 0%, transparent 18%),
    radial-gradient(circle at 70% 60%, #8FB873 0%, transparent 22%),
    radial-gradient(circle at 50% 80%, #B4541A 0%, transparent 20%),
    #E8E6E0;
}
.app-mock__thumb--b {
  background:
    radial-gradient(circle at 30% 30%, #5A4A3A 0 8%, transparent 9%),
    radial-gradient(circle at 50% 50%, #5A4A3A 0 6%, transparent 7%),
    radial-gradient(circle at 70% 40%, #5A4A3A 0 7%, transparent 8%),
    radial-gradient(circle at 40% 70%, #5A4A3A 0 5%, transparent 6%),
    radial-gradient(circle at 60% 80%, #5A4A3A 0 6%, transparent 7%),
    #E8E6E0;
}
.app-mock__thumb--c {
  grid-column: span 2;
  aspect-ratio: auto;
  height: 56px;
  background:
    repeating-linear-gradient(45deg, #0A0A0A 0 2px, transparent 2px 6px),
    repeating-linear-gradient(-45deg, #8A8A8A 0 1px, transparent 1px 8px),
    #E8E6E0;
}
.app-mock__slider {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}
.app-mock__slider-label { flex-shrink: 0; }
.app-mock__slider-track {
  flex: 1;
  height: 2px;
  background: var(--border);
  position: relative;
}
.app-mock__slider-fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 42%;
  background: var(--text);
}

/* ---------- About ---------- */
.section--about {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}
.about__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
.about__main p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.85;
  max-width: 56ch;
  margin-bottom: 18px;
}
.about__main p:last-child { margin-bottom: 0; }
.about__lede {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 1rem + 0.6vw, 1.5rem) !important;
  line-height: 1.55 !important;
  color: var(--text) !important;
  font-weight: 400;
  font-variation-settings: "opsz" 36;
  margin-bottom: 24px !important;
}
.about__em {
  color: var(--text);
  font-style: italic;
  font-family: var(--font-display);
  font-weight: 500;
  border-bottom: 1px solid var(--text);
}

.about__side {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.about__dl {
  display: grid;
  gap: 16px;
}
.about__dl dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.about__dl dd {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.5;
}
.about__dl dd a {
  color: var(--text);
  border-bottom: 1px solid var(--text);
  transition: opacity var(--dur-fast) var(--ease-out);
}
.about__dl dd a:hover { opacity: 0.6; }

/* ---------- Stack ---------- */
.stack-list {
  display: grid;
  border-top: 1px solid var(--border);
}
.stack-list__item {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 24px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left var(--dur) var(--ease-out), background var(--dur) var(--ease-out);
}
.stack-list__item:hover {
  padding-left: 16px;
  background: var(--bg-soft);
}
.stack-list__cat {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.stack-list__name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.2rem;
  color: var(--text);
  letter-spacing: -0.01em;
  font-variation-settings: "opsz" 24;
}
.stack-list__note {
  font-size: 0.86rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ---------- 主营业务板块 ---------- */
.section--services {
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(12px, 1.5vw, 20px);
}

.service {
  position: relative;
  padding: 26px 22px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition:
    border-color var(--dur) var(--ease-out),
    background var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out);
}
.service::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 0;
  height: 2px;
  background: var(--text);
  transition: width var(--dur-slow) var(--ease-out);
}
.service:hover {
  border-color: var(--accent);
  background: var(--bg-soft);
}
.service:hover::before { width: 100%; }
.service:focus-within {
  border-color: var(--accent);
}
.service:focus-within::before { width: 100%; }

/* 强调服务（网创）— 反色处理 */
.service--accent {
  background: var(--accent);
  border-color: var(--accent);
}
.service--accent:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}
.service--accent .service__num,
.service--accent .service__title,
.service--accent .service__desc {
  color: var(--bg);
}
.service--accent .service__tag--accent {
  color: var(--accent);
  background: var(--bg);
  border-color: var(--bg);
}
.service--accent .service__tags li {
  color: rgba(255, 255, 255, 0.7);
  border-color: rgba(255, 255, 255, 0.2);
}
.service--accent .service__tags li::before {
  background: rgba(255, 255, 255, 0.4);
}
.service--accent::before {
  background: var(--bg);
}

.service__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 12px;
}
.service__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}
.service__tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--tag-border);
  background: var(--tag-bg);
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}
.service__tag--accent {
  color: var(--text-secondary);
  border-color: var(--border);
  background: var(--bg-soft);
}

.service__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.32rem;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 10px;
  font-variation-settings: "opsz" 24;
}
.service__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.service__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.service__tags li {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  padding: 3px 8px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  position: relative;
}
.service__tags li::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-dim);
  margin-right: 6px;
  vertical-align: middle;
}

/* 响应式 */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 560px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Contact ---------- */
.section--contact {
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.section__head--contact { max-width: none; }
.section__title--contact {
  font-size: clamp(2.2rem, 1.5rem + 2.8vw, 3.8rem);
  max-width: 18ch;
}
.section__title--contact em {
  font-style: italic;
  color: var(--text);
  font-weight: 500;
  font-variation-settings: "opsz" 144;
  border-bottom: 2px solid var(--text);
}

.contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(40px, 6vw, 80px);
  margin-top: clamp(40px, 6vw, 72px);
  padding-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--border);
}
.contact__lede {
  font-size: var(--fs-lede);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 48ch;
}
.contact__email {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.4rem);
  color: var(--text);
  letter-spacing: -0.02em;
  border-bottom: 2px solid var(--text);
  padding-bottom: 6px;
  transition: gap var(--dur) var(--ease-out);
  font-variation-settings: "opsz" 72;
}
.contact__email:hover { gap: 18px; }
.contact__email-arrow {
  font-family: var(--font-body);
  font-size: 0.8em;
}
.contact__note {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.contact__links { display: grid; gap: 0; }
.contact__links li {
  display: grid;
  grid-template-columns: 100px 1fr;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.contact__links li:first-child { border-top: 1px solid var(--border); }
.contact__link-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.contact__links a {
  color: var(--text);
  font-size: 0.92rem;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.contact__links a:hover { opacity: 0.6; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}
.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 64px) var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}
.footer__left {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer__mark {
  width: 38px; height: 38px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 500;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--radius-sm);
}
.footer__name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}
.footer__meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
}
.footer__right { text-align: right; }
.footer__colophon {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}
.footer__copy {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
}

/* ---------- 滚动渐入 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 56px;
  }
  .hero__aside { max-width: 540px; }
  .card--featured .card__link {
    grid-template-columns: 1fr;
  }
  .card--featured .card__media {
    border-right: none;
    border-bottom: 1px solid var(--border);
    min-height: 260px;
  }
}

@media (max-width: 820px) {
  .work-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .card--featured,
  .card--code,
  .card--metric,
  .card--compact,
  .card--text {
    grid-column: span 2;
  }
  .about__grid,
  .contact__grid,
  .footer__inner {
    grid-template-columns: 1fr;
  }
  .footer__right { text-align: left; }
  .stack-list__item {
    grid-template-columns: 110px 1fr;
  }
  .stack-list__note {
    grid-column: 2;
    margin-top: 4px;
  }
}

@media (max-width: 640px) {
  .status-bar { font-size: 0.64rem; padding: 6px var(--gutter); }
  .nav__inner { padding: 14px var(--gutter); }
  .nav__links { gap: 14px; }
  .nav__links a:not(.nav__cta) { display: none; }

  .hero__meta {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .hero__meta-item {
    padding: 0 0 16px 0 !important;
    border-right: none !important;
    border-bottom: 1px solid var(--border);
  }
  .hero__meta-item:last-child { border-bottom: none; padding-bottom: 0 !important; }

  .hero__title { font-size: clamp(2.2rem, 1.6rem + 3vw, 3rem); }
  .hero__terminal-body { font-size: 0.72rem; padding: 14px 16px; }

  .work-grid { grid-template-columns: 1fr; }
  .card--featured,
  .card--code,
  .card--metric,
  .card--compact,
  .card--text {
    grid-column: span 1;
  }
  .editor-mock__body { grid-template-columns: 1fr; }
  .editor-mock__pane--src { border-right: none; border-bottom: 1px solid var(--border); }

  .metric-mock__grid { grid-template-columns: 1fr 1fr; }
  .contact__links li { grid-template-columns: 80px 1fr; }
}

/* ---------- 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .t-cursor { animation: none; }
}

/* ---------- 大屏优化 ---------- */
@media (min-width: 1400px) {
  :root { --container: 1280px; }
}

/* ============================================================
   案例详情页 · Case Study
   复用主页设计系统，新增 case 专用布局
   ============================================================ */

/* Case Hero — 项目封面 */
.case-hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(48px, 8vh, 96px) var(--gutter) clamp(40px, 6vh, 72px);
  border-bottom: 1px solid var(--border);
}
.case-hero__crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 28px;
}
.case-hero__crumb a {
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.case-hero__crumb a:hover {
  color: var(--text);
  border-color: var(--text);
}
.case-hero__crumb-sep { color: var(--text-dim); }

.case-hero__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.4rem, 1.6rem + 3vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--text);
  font-variation-settings: "opsz" 144;
  margin-bottom: 16px;
}
.case-hero__subtitle {
  font-size: var(--fs-lede);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 60ch;
  margin-bottom: 36px;
}

/* Case Hero 配图 — 扁平化：边框 + 圆角，无阴影 */
.case-hero__media {
  margin-top: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-soft);
}
.case-hero__media img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--bg-tint);
}
.case-hero__caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.case-hero__caption figlabel,
.case-hero__caption span { display: inline-block; }
.case-hero__caption-meta { color: var(--text-dim); }

@media (max-width: 640px) {
  .case-hero__caption { flex-direction: column; align-items: flex-start; gap: 4px; }
}

/* Case 指标条 */
.case-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.case-meta__cell {
  padding: 20px 24px;
  border-right: 1px solid var(--border);
}
.case-meta__cell:last-child { border-right: none; }
.case-meta__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.case-meta__value {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.3rem;
  color: var(--text);
  letter-spacing: -0.01em;
  font-variation-settings: "opsz" 24;
}

/* Case 正文 */
.case-body {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: clamp(56px, 8vh, 96px) var(--gutter);
}
.case-section {
  margin-bottom: clamp(48px, 7vh, 80px);
}
.case-section:last-child { margin-bottom: 0; }
.case-section__label {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.case-section__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 20px;
  font-variation-settings: "opsz" 48;
}
.case-section__title em {
  font-style: italic;
  color: var(--text);
  font-weight: 500;
}
.case-section p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 18px;
  max-width: 64ch;
}
.case-section p:last-child { margin-bottom: 0; }
.case-section strong {
  color: var(--text);
  font-weight: 600;
}

/* Case 引用 */
.case-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.3rem, 1.1rem + 0.8vw, 1.7rem);
  line-height: 1.55;
  color: var(--text);
  padding: 24px 0 24px 24px;
  border-left: 3px solid var(--text);
  margin: 32px 0;
  font-variation-settings: "opsz" 36;
}

/* Case 步骤清单 */
.case-steps {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
.case-steps__item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
}
.case-steps__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  padding-top: 2px;
}
.case-steps__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.case-steps__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Case 技术栈 */
.case-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--border);
}
.case-stack__item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}
.case-stack__item:nth-child(odd) { padding-right: 24px; }
.case-stack__cat {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.case-stack__val {
  font-size: 0.92rem;
  color: var(--text);
  font-weight: 500;
}

/* Case 结果指标 */
.case-results {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.case-results__cell {
  padding: 28px 24px;
  border-right: 1px solid var(--border);
  background: var(--surface);
}
.case-results__cell:last-child { border-right: none; }
.case-results__num {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 1.5rem + 2vw, 2.8rem);
  line-height: 1;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  font-variation-settings: "opsz" 72;
}
.case-results__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* Case 上下篇导航 */
.case-nav {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}
.case-nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 64px) var(--gutter);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(24px, 4vw, 48px);
}
.case-nav__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 0;
  transition: padding var(--dur) var(--ease-out);
}
.case-nav__link:hover { padding-left: 8px; }
.case-nav__link--next {
  text-align: right;
  align-items: flex-end;
}
.case-nav__link--next:hover { padding-left: 0; padding-right: 8px; }
.case-nav__dir {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--text-muted);
  letter-spacing: 0.06em;
}
.case-nav__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* Case 响应式 */
@media (max-width: 820px) {
  .case-meta { grid-template-columns: repeat(2, 1fr); }
  .case-meta__cell:nth-child(2) { border-right: none; }
  .case-meta__cell:nth-child(1),
  .case-meta__cell:nth-child(2) { border-bottom: 1px solid var(--border); }
  .case-stack { grid-template-columns: 1fr; }
  .case-stack__item:nth-child(odd) { padding-right: 0; }
  .case-results { grid-template-columns: 1fr; }
  .case-results__cell { border-right: none; border-bottom: 1px solid var(--border); }
  .case-results__cell:last-child { border-bottom: none; }
  .case-nav__inner { grid-template-columns: 1fr; }
  .case-nav__link--next { text-align: left; align-items: flex-start; }
}
@media (max-width: 560px) {
  .case-meta { grid-template-columns: 1fr; }
  .case-meta__cell { border-right: none; border-bottom: 1px solid var(--border); }
  .case-meta__cell:last-child { border-bottom: none; }
}