/* 客户案例详情页共享样式（与首页 home.css 同一套令牌） */
:root {
  color-scheme: light;
  --bg: #f3f5f8;
  --paper: #ffffff;
  --paper-soft: #eceff4;
  --ink: #16181d;
  --text: #333943;
  --muted: #4a5460;
  --faint: #5b6572;
  --line: #e0e5ec;
  --line-strong: #bcc6d2;
  --accent: #bd362a;
  --accent-soft: #fbe9e6;
  --accent-strong: #9c2b21;
  --serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", Georgia, serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --max: 860px;
}
* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(rgba(30, 41, 59, 0.05) 1px, transparent 1px) 0 0 / 22px 22px,
    linear-gradient(180deg, rgba(255, 255, 255, 0.85), transparent 300px),
    var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }
::selection { background: var(--accent-soft); color: var(--ink); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px 72px; }

/* 顶栏 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}
.brand-mark img { width: 20px; height: 20px; display: block; }
.back-link { color: var(--muted); font-size: 14px; font-weight: 600; }
.back-link:hover { color: var(--accent); }

/* 页头 */
.case-head { padding: 52px 0 30px; }
.kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.kicker::before { content: "// "; color: var(--faint); }
.case-head h1 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.01em;
}
.case-lead {
  margin: 18px 0 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 16.5px;
  line-height: 1.85;
}
.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.case-meta span {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 600;
}
.case-meta span.state { border-color: var(--accent); color: var(--accent); }

/* 小节 */
.case-sec { margin-top: 44px; }
.case-sec h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 700;
}
.case-sec h2 .no {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
}
.case-sec p { margin: 0 0 0.9em; }

/* 功能清单 */
.feat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.feat-grid li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
  font-size: 14px;
  line-height: 1.65;
}
.feat-grid li strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 14.5px;
}
.feat-grid li span { color: var(--muted); font-size: 13px; }

/* 工程亮点：等宽编号列表 */
.eng-list { margin: 0; padding: 0; list-style: none; counter-reset: eng; }
.eng-list li {
  position: relative;
  padding: 12px 0 12px 44px;
  border-bottom: 1px solid var(--line);
  counter-increment: eng;
}
.eng-list li:last-child { border-bottom: 0; }
.eng-list li::before {
  content: counter(eng, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 13px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}
.eng-list li strong { color: var(--ink); }
.eng-list li span { color: var(--muted); }

/* 在线体验演示 */
.demo-box { padding: 20px 22px; border: 1px solid var(--line, #d9dee6); border-radius: 16px; background: var(--paper); }
.demo-box p { margin: 0 0 10px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.demo-box code { padding: 1px 6px; border-radius: 6px; background: var(--bg); color: var(--ink); font-family: var(--mono); font-size: 13px; }
.demo-btn { display: inline-flex; align-items: center; min-height: 44px; margin-top: 6px; padding: 0 20px; border-radius: 999px; background: var(--accent); color: #fff; font-size: 15px; font-weight: 700; text-decoration: none; }

/* 权限声明卡 */
.case-lock {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-top: 48px;
  padding: 22px 24px;
  border: 1px solid var(--ink);
  border-radius: 16px;
  background: var(--paper);
}
.case-lock .lock-tag {
  flex: none;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
}
.case-lock p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.case-lock p strong { color: var(--ink); }

/* 上一篇/下一篇 + 返回 */
.case-nav {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.case-nav a { color: var(--muted); font-weight: 600; }
.case-nav a:hover { color: var(--accent); }

@media (max-width: 680px) {
  .wrap { padding: 0 16px 56px; }
  .case-head { padding: 36px 0 24px; }
  .feat-grid { grid-template-columns: 1fr; }
}

/* ---------------------------------------------------------------------
 * 案例索引页（/cases/）
 * ------------------------------------------------------------------ */

.work-list { display: flex; flex-direction: column; margin-top: 8px; }

.work-card {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 26px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  transition: padding-left 0.18s ease;
}
.work-card:first-child { border-top: 1px solid var(--ink); }
.work-card:hover { padding-left: 10px; color: var(--text); text-decoration: none; }
.work-card:hover .work-main strong { color: var(--accent); }
.work-card:hover .work-arrow { transform: translateX(4px); color: var(--accent); }

.work-no {
  flex: none;
  padding-top: 4px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.work-main { flex: 1; min-width: 0; }
.work-main strong {
  display: block;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 700;
  line-height: 1.32;
  transition: color 0.15s ease;
}
.work-sub {
  display: block;
  margin-top: 7px;
  max-width: 600px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}
.work-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.work-tags i {
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--muted);
  font-size: 11.5px;
  font-style: normal;
  font-weight: 600;
}

.work-side { flex: none; display: flex; flex-direction: column; align-items: flex-end; gap: 12px; padding-top: 4px; }
.work-lock {
  padding: 3px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.work-arrow { font-size: 20px; color: var(--faint); transition: transform 0.15s ease, color 0.15s ease; }

@media (max-width: 680px) {
  .work-card { gap: 14px; padding: 22px 0; }
  .work-lock { display: none; }
}

/* ---------------------------------------------------------------------
 * Skill 能力案例页（/skills/）
 * ------------------------------------------------------------------ */

.skill-group { margin-top: 44px; }
.skill-group h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
}
.skill-group h2 .no {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
}
.skill-group .group-lead {
  margin: 12px 0 4px;
  max-width: 660px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.85;
}
.skill-card { padding: 22px 0; border-bottom: 1px solid var(--line); }
.skill-card:last-child { border-bottom: 0; }
.skill-card h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(18px, 2.4vw, 21px);
  font-weight: 700;
  line-height: 1.38;
}
.skill-card p { margin: 8px 0 0; max-width: 660px; color: var(--muted); font-size: 14.5px; line-height: 1.85; }
.work-tags i.proven { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-strong); }
.skill-links { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 14px; font-size: 13.5px; font-weight: 650; }
.skill-links a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
.skill-links a:hover { color: var(--accent-strong); border-bottom-color: currentColor; }

/* /cases/ 底部：指向 Skill 能力案例 */
.skill-teaser {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 28px;
  padding: 18px 22px;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: var(--accent-soft);
}
.skill-teaser strong { color: var(--ink); }
.skill-teaser span { color: var(--muted); font-size: 14px; }
.skill-teaser a { color: var(--accent); font-weight: 700; text-decoration: none; }

/* ---------------------------------------------------------------------
 * 站点统一：顶部导航 / 页脚 / 纯文字页（关于、联系、隐私）
 * 首页、案例、Skill、关于、联系、隐私共用同一套令牌与外壳。
 * ------------------------------------------------------------------ */

.topnav { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.topnav a {
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
.topnav a:hover { background: rgba(22, 24, 29, 0.05); color: var(--ink); }
.topnav a[aria-current="page"] { background: var(--ink); color: var(--paper); }

.site-foot {
  display: flex;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
  margin-top: 56px;
  padding: 20px 0 8px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 13px;
}
.site-foot a { color: var(--muted); text-decoration: none; }
.site-foot a:hover { color: var(--accent); }

/* 纯文字页：小节、列表 */
.case-sec ul, .case-sec ol { margin: 0 0 0.9em; padding: 0; list-style: none; }
.case-sec ul li {
  position: relative;
  padding: 9px 0 9px 20px;
  border-bottom: 1px solid var(--line);
}
.case-sec ul li:first-child { border-top: 1px solid var(--line); }
.case-sec ul li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 19px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.case-sec ol { counter-reset: n; }
.case-sec ol li { position: relative; padding: 9px 0 9px 34px; border-bottom: 1px solid var(--line); counter-increment: n; }
.case-sec ol li:first-child { border-top: 1px solid var(--line); }
.case-sec ol li::before {
  content: counter(n, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 11px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}
.case-sec li strong, .case-sec p strong { color: var(--ink); font-weight: 680; }
.case-sec a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(189, 54, 42, 0.35); }
.case-sec a:hover { border-bottom-color: var(--accent); }
.case-meta-line { margin: 14px 0 0; color: var(--faint); font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; }

@media (max-width: 560px) {
  .topbar { gap: 8px; }
  .topnav a { padding: 6px 8px; font-size: 13px; }
  .site-foot { flex-direction: column; }
}

/* ---------------------------------------------------------------------
 * 手机端：点击区域与小字号（案例 / Skill / 关于 / 联系 / 隐私共用）
 * ------------------------------------------------------------------ */
@media (max-width: 680px) {
  .topnav a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 9px; }
  .brand { min-height: 44px; }
  .site-foot a { display: inline-block; padding: 12px 6px; }
  .site-foot { row-gap: 0; }
  .case-nav a, .skill-links a, .back-link, .skill-teaser a { display: inline-flex; align-items: center; min-height: 44px; }
  .work-card { padding-top: 22px; padding-bottom: 22px; }
  .work-tags i, .case-meta span { font-size: 12px; }
  .kicker { font-size: 11px; }
  .skill-teaser { padding: 16px; }
}