/* ============================================================
   site.css — 乐冠国际 共享外壳层
   深墨绿控制台底色 / 暖灰浮岛导航 / 乐冠金 + 电光青 信号色
   ============================================================ */

:root {
  color-scheme: dark;

  --green-950: #041d18;
  --green-900: #062B24;
  --green-800: #0A3A31;
  --green-700: #0F5C50;
  --ink-900: #0B1210;
  --ink-800: #141C1A;

  --warm-300: #D9D2C7;
  --warm-200: #E8E2D8;
  --paper: #F4F1EA;

  --gold: #E0B24A;
  --gold-bright: #F0C65F;
  --cyan: #34D6C4;
  --copper: #8C7A63;
  --mist: #BFD8D1;
  --amber: #F0A33B;

  --text-strong: #F4F1EA;
  --text-muted: #A9BDB6;
  --text-dim: #7E958D;
  --text-ink-muted: #4A5D57;

  --line: rgba(191, 216, 209, 0.16);
  --line-strong: rgba(191, 216, 209, 0.34);

  --font-display: "Noto Sans SC", "Source Han Sans SC", system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1280px;
  --gutter: clamp(16px, 3.2vw, 40px);
  --radius-lg: 26px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;

  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  --dur: 0.18s;
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--green-900);
  color: var(--text-strong);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg, video { max-width: 100%; }
img { height: auto; }

button, input, select, textarea { font: inherit; color: inherit; }

ul, ol { list-style: none; }

::selection {
  background: var(--gold);
  color: var(--green-950);
}

/* ---------- 中文排版 ---------- */
:lang(zh), html:lang(zh-CN) {
  word-break: normal;
  line-break: strict;
  text-spacing: trim-start;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

p {
  margin: 0 0 1em;
  text-wrap: pretty;
}

p:last-child { margin-bottom: 0; }

strong { font-weight: 700; }

/* ---------- 焦点 ---------- */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
details:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px rgba(224, 178, 74, 0.26);
  border-radius: 8px;
}

#main-content:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 8px;
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 11px 18px;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: var(--green-950);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 12px var(--gutter) 10px;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 -22px 0;
  background: linear-gradient(180deg, var(--green-900) 0%, rgba(6, 43, 36, 0.9) 58%, rgba(6, 43, 36, 0) 100%);
  pointer-events: none;
}

.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 90;
  background: rgba(191, 216, 209, 0.12);
  pointer-events: none;
}

.scroll-meter-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  transition: width 0.08s linear;
}

.header-shell {
  position: relative;
  z-index: 1;
}

.nav-capsule {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.2vw, 18px);
  width: min(100%, 1320px);
  margin: 0 auto;
  padding: 9px 10px 9px 16px;
  border-radius: var(--radius-pill);
  background: rgba(217, 210, 199, 0.94);
  -webkit-backdrop-filter: blur(16px) saturate(1.25);
  backdrop-filter: blur(16px) saturate(1.25);
  border: 1px solid rgba(6, 43, 36, 0.14);
  box-shadow: 0 26px 60px -36px rgba(0, 0, 0, 0.9);
  color: var(--green-900);
  transition: padding 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.site-header[data-scrolled] .nav-capsule {
  padding-top: 5px;
  padding-bottom: 5px;
  box-shadow: 0 24px 52px -32px rgba(0, 0, 0, 0.95), 0 0 0 1px rgba(224, 178, 74, 0.24);
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 4px 6px;
  border-radius: var(--radius-pill);
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 30px;
  height: 30px;
  flex: none;
  border-radius: 10px;
  overflow: hidden;
  background:
    linear-gradient(135deg, var(--green-950) 0 52%, transparent 52% 100%),
    linear-gradient(135deg, var(--gold) 0 100%);
  box-shadow: inset 0 0 0 1px rgba(6, 43, 36, 0.18);
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 13px;
  height: 13px;
  background: var(--cyan);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.brand-text {
  display: grid;
  gap: 3px;
  line-height: 1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 900;
  font-stretch: 87.5%;
  letter-spacing: -0.01em;
  color: var(--green-950);
}

.brand-latin {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--green-700);
}

/* version badge */
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: 0 0 auto;
  margin: 0;
  padding: 5px 12px 5px 10px;
  border-radius: var(--radius-pill);
  background: rgba(6, 43, 36, 0.07);
  border: 1px solid rgba(6, 43, 36, 0.16);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  color: var(--green-800);
  white-space: nowrap;
}

.version-dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(52, 214, 196, 0.24);
}

/* mobile toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(6, 43, 36, 0.24);
  background: rgba(6, 43, 36, 0.06);
  color: var(--green-900);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover { background: rgba(6, 43, 36, 0.12); }

.nav-toggle-label { line-height: 1; }

.nav-toggle-bars {
  position: relative;
  width: 16px;
  height: 10px;
  flex: none;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  top: 4px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  top: 4px;
  transform: rotate(-45deg);
}

/* primary nav */
.primary-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
}

.nav-item { display: flex; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border-radius: var(--radius-pill);
  color: var(--green-800);
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.nav-link:hover {
  background: rgba(6, 43, 36, 0.1);
  color: var(--green-950);
}

.nav-link[aria-current="page"] {
  background: var(--green-900);
  color: var(--paper);
  box-shadow: inset 0 0 0 1px rgba(52, 214, 196, 0.55);
}

.nav-link[aria-current="page"]::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
}

.nav-item--cta { margin-left: 8px; }

.nav-link--cta {
  padding: 9px 18px;
  background: var(--gold);
  color: var(--green-950);
  font-weight: 700;
  box-shadow: 0 12px 26px -16px rgba(224, 178, 74, 0.95);
}

.nav-link--cta:hover {
  background: var(--gold-bright);
  color: var(--green-950);
}

.nav-link--cta[aria-current="page"] {
  background: var(--gold);
  color: var(--green-950);
  box-shadow: inset 0 0 0 2px var(--green-900);
}

.nav-link--cta[aria-current="page"]::before { display: none; }

.nav-hint { display: none; margin: 0; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 9vw, 130px);
  padding: clamp(36px, 6vw, 76px) 0 clamp(18px, 3vw, 30px);
  background: var(--ink-900);
  color: var(--paper);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(191, 216, 209, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(191, 216, 209, 0.055) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  pointer-events: none;
}

.footer-shell {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 2 * var(--gutter)), var(--shell));
  margin-inline: auto;
}

.footer-head {
  display: grid;
  gap: 14px;
  padding-bottom: clamp(22px, 3.4vw, 40px);
  border-bottom: 1px solid var(--line);
}

.footer-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-claim {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.4vw, 3.4rem);
  font-weight: 900;
  font-stretch: 87.5%;
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(26px, 4vw, 46px) 0;
}

.footer-col { min-width: 0; }

.footer-brand {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 900;
  font-stretch: 87.5%;
  letter-spacing: -0.02em;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-brand:hover {
  color: var(--gold);
  border-color: var(--gold);
}

.footer-summary {
  margin: 14px 0 18px;
  max-width: 42ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.num-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--gold);
  color: var(--green-950);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.footer-heading {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
}

.footer-link-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 18px;
  margin: 0;
  padding: 0;
}

.footer-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0;
  color: var(--mist);
  font-size: 14.5px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-link:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.footer-link-idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--green-700);
}

.footer-link:hover .footer-link-idx { color: var(--cyan); }

.footer-contact-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
}

.footer-contact-item {
  display: grid;
  gap: 5px;
}

.footer-contact-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
}

.footer-contact-value {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-contact-text {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.01em;
  line-height: 1.5;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(52, 214, 196, 0.45);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.copy-btn:hover { background: rgba(52, 214, 196, 0.14); }

.copy-btn[data-copied] {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(224, 178, 74, 0.12);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(191, 216, 209, 0.14);
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 0;
  padding: 0;
}

.footer-legal-link {
  padding-bottom: 1px;
  color: var(--mist);
  font-size: 12.5px;
  text-decoration: none;
  border-bottom: 1px solid rgba(191, 216, 209, 0.28);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-legal-link:hover {
  color: var(--gold);
  border-color: var(--gold);
}

/* ============================================================
   通用布局 / 容器
   ============================================================ */
.shell {
  width: min(calc(100% - 2 * var(--gutter)), var(--shell));
  margin-inline: auto;
}

.shell--narrow {
  width: min(calc(100% - 2 * var(--gutter)), 840px);
  margin-inline: auto;
}

.stack {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
}

.rule {
  height: 1px;
  margin: clamp(18px, 2.6vw, 32px) 0;
  border: 0;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

/* ============================================================
   面板（堆叠画板）
   ============================================================ */
.panel {
  position: relative;
  padding: clamp(22px, 3.6vw, 52px);
  border-radius: var(--radius-lg);
  background: var(--green-800);
  border: 1px solid var(--line);
}

.panel--ink {
  background: var(--ink-900);
  color: var(--paper);
}

.panel--paper {
  background: var(--paper);
  color: var(--ink-900);
  border-color: rgba(6, 43, 36, 0.12);
}

.panel--glass {
  background: rgba(191, 216, 209, 0.07);
  border-color: rgba(191, 216, 209, 0.22);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.panel--gold {
  background: var(--gold);
  color: var(--green-950);
  border-color: transparent;
}

.panel--flush { padding: 0; }

/* ============================================================
   章节标题组
   ============================================================ */
.section-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(18px, 2.6vw, 34px);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  font-weight: 900;
  font-stretch: 87.5%;
  line-height: 1.06;
  letter-spacing: -0.028em;
}

.section-lead {
  max-width: 58ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.68;
  color: var(--text-muted);
}

.panel--paper .section-lead,
.panel--paper .prose { color: var(--text-ink-muted); }

.panel--gold .section-lead { color: rgba(6, 43, 36, 0.78); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  flex: none;
  background: currentColor;
}

.panel--paper .eyebrow { color: var(--green-700); }

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn--gold {
  background: var(--gold);
  color: var(--green-950);
  box-shadow: 0 18px 36px -24px rgba(224, 178, 74, 0.95);
}

.btn--gold:hover { background: var(--gold-bright); }

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--dark {
  background: var(--green-900);
  color: var(--paper);
}

.btn--dark:hover { background: var(--green-950); }

.btn--sm {
  padding: 8px 15px;
  font-size: 13px;
}

.btn--block { width: 100%; }

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb { padding: 20px 0 0; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--copper);
}

.breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb-link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.breadcrumb-current { color: var(--gold); }

/* ============================================================
   正文容器
   ============================================================ */
.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--text-muted);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
  color: var(--text-strong);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 1.15rem;
  color: var(--text-strong);
}

.prose ul,
.prose ol {
  margin: 0;
  padding-left: 1.35em;
}

.prose ul { list-style: square; }
.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.4em; }

.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose strong { color: var(--text-strong); }

.prose--paper { color: var(--text-ink-muted); }

.prose--paper h2,
.prose--paper h3,
.prose--paper strong { color: var(--ink-900); }

.prose--paper a { color: var(--green-700); }

/* ============================================================
   网格
   ============================================================ */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 26px);
}

.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

/* ============================================================
   标签
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  background: rgba(52, 214, 196, 0.12);
  border: 1px solid rgba(52, 214, 196, 0.34);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag--gold {
  background: rgba(224, 178, 74, 0.14);
  border-color: rgba(224, 178, 74, 0.42);
  color: var(--gold);
}

.tag--muted {
  background: rgba(191, 216, 209, 0.08);
  border-color: rgba(191, 216, 209, 0.26);
  color: var(--mist);
}

/* ============================================================
   媒体容器（图片占位基础规则）
   ============================================================ */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 22px, rgba(191, 216, 209, 0.09) 22px 23px),
    repeating-linear-gradient(90deg, transparent 0 22px, rgba(191, 216, 209, 0.09) 22px 23px),
    linear-gradient(135deg, rgba(15, 92, 80, 0.92), rgba(6, 43, 36, 0.96));
  background-size: auto, auto, auto;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, transparent, rgba(4, 29, 24, 0.72));
  pointer-events: none;
}

.media-frame > img,
.media-frame > svg {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.02);
}

.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame--paper {
  border-color: rgba(6, 43, 36, 0.14);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 22px, rgba(6, 43, 36, 0.07) 22px 23px),
    linear-gradient(135deg, var(--warm-200), var(--warm-300));
}

.media-frame--paper::after {
  background: linear-gradient(180deg, transparent, rgba(217, 210, 199, 0.55));
}

/* ============================================================
   技能树 / 服务路径
   ============================================================ */
.tree {
  position: relative;
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
}

.tree-node {
  position: relative;
  padding: 0 0 clamp(18px, 2.6vw, 30px) clamp(26px, 3.4vw, 44px);
  border-left: 1px solid rgba(52, 214, 196, 0.32);
}

.tree-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.tree-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green-900);
  box-shadow: 0 0 0 2px var(--cyan);
}

.tree-node--active::before {
  background: var(--gold);
  box-shadow: 0 0 0 2px var(--gold), 0 0 0 7px rgba(224, 178, 74, 0.18);
}

.tree-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 6px;
}

.tree-title {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-strong);
  margin-bottom: 6px;
}

.tree-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-muted);
}

.panel--paper .tree-title { color: var(--ink-900); }
.panel--paper .tree-desc { color: var(--text-ink-muted); }
.panel--paper .tree-label { color: var(--green-700); }

/* ============================================================
   版本对照表
   ============================================================ */
.compare {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(191, 216, 209, 0.04);
}

.compare-row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 8px 16px;
  align-items: start;
  padding: 14px 18px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

.compare-row:first-child { border-top: 0; }

.compare-row--head {
  background: rgba(191, 216, 209, 0.07);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--copper);
}

.compare-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ============================================================
   折叠披露
   ============================================================ */
.disclosure {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(191, 216, 209, 0.04);
}

.disclosure + .disclosure { margin-top: 10px; }

.disclosure > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-strong);
  cursor: pointer;
  list-style: none;
}

.disclosure > summary::-webkit-details-marker { display: none; }

.disclosure > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.disclosure[open] > summary::after { content: "–"; }

.disclosure-body {
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--text-muted);
}

.panel--paper .disclosure {
  border-color: rgba(6, 43, 36, 0.14);
  background: rgba(6, 43, 36, 0.03);
}

.panel--paper .disclosure > summary { color: var(--ink-900); }
.panel--paper .disclosure > summary::after { color: var(--green-700); }
.panel--paper .disclosure-body { color: var(--text-ink-muted); }

/* ============================================================
   数据点
   ============================================================ */
.stat {
  display: grid;
  gap: 4px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--gold);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--copper);
}

.panel--paper .stat-value { color: var(--green-700); }

/* ============================================================
   显现
   ============================================================ */
[data-reveal] {
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}

html[data-motion="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}

html[data-motion="on"] [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .nav-link { padding: 8px 11px; font-size: 14px; }
  .footer-grid { grid-template-columns: 1.2fr 1fr 1fr; }
}

@media (max-width: 960px) {
  .site-header { padding: 10px 12px 8px; }

  .nav-capsule {
    flex-wrap: wrap;
    row-gap: 8px;
    padding: 8px 10px 8px 12px;
    border-radius: 22px;
  }

  .nav-toggle { display: inline-flex; margin-left: auto; }
  .version-badge { font-size: 10px; padding: 4px 9px 4px 8px; }

  .primary-nav {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin: 4px 0 0;
    padding: 12px;
    border-radius: 18px;
    background: var(--green-900);
    color: var(--paper);
    box-shadow: inset 0 0 0 1px rgba(191, 216, 209, 0.16);
  }

  .primary-nav[data-open] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-item { display: block; }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 14px;
    border-radius: 12px;
    color: var(--paper);
    font-size: 15px;
  }

  .nav-link:hover {
    background: rgba(52, 214, 196, 0.14);
    color: #ffffff;
  }

  .nav-link[aria-current="page"] {
    background: rgba(52, 214, 196, 0.16);
    color: #ffffff;
    box-shadow: inset 0 0 0 1px rgba(52, 214, 196, 0.6);
  }

  .nav-item--cta { margin: 8px 0 0; }

  .nav-link--cta,
  .nav-link--cta:hover {
    justify-content: center;
    background: var(--gold);
    color: var(--green-950);
  }

  .nav-hint {
    display: block;
    margin: 10px 4px 2px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--mist);
  }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col--brand { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .grid-12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

  .col-2, .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-10, .col-11, .col-12 {
    grid-column: 1 / -1;
  }

  .compare-row { grid-template-columns: 1fr; gap: 6px; }
  .compare-row--head { display: none; }
}

@media (max-width: 620px) {
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-link-list { grid-template-columns: 1fr 1fr; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .footer-claim { max-width: none; }
  .panel { border-radius: 20px; }
}

@media (max-width: 420px) {
  .brand-latin { display: none; }
  .version-badge { font-size: 9.5px; letter-spacing: 0.06em; }
}

/* ============================================================
   动效偏好
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  html[data-motion="on"] [data-reveal],
  html[data-motion="on"] [data-reveal].is-visible {
    opacity: 1 !important;
    transform: none !important;
  }

  .btn:hover { transform: none; }
  .scroll-meter-fill { transition: none; }
}