/* ==========================================================================
   长城赛场 · 共享样式表 /assets/site.css
   体系：城墙玄墨底 + 精密网格 + 烽火橘单点强调 + 数据绿松石等宽数字
   ========================================================================== */

/* --- 01 变量 ------------------------------------------------------------- */
:root {
  --ink: #14171A;
  --brick-dark: #23272B;
  --brick-mid: #3A4046;
  --seam: #6E767D;
  --white: #F2F1EC;
  --orange: #E2571E;
  --orange-deep: #A63A10;
  --flare: #FF8A4C;
  --teal: #1FB8A0;
  --teal-deep: #0E7C6B;
  --red: #C42B2B;
  --sand: #C9BFA6;

  --line-faint: rgba(201, 191, 166, 0.14);
  --line: rgba(201, 191, 166, 0.26);
  --line-strong: rgba(201, 191, 166, 0.48);
  --text-soft: rgba(242, 241, 236, 0.78);
  --text-dim: #6E767D;

  --font-display: "HarmonyOS Sans SC Condensed", "Source Han Sans Heavy", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-900: clamp(44px, 6.4vw, 72px);
  --fs-800: clamp(34px, 4.6vw, 56px);
  --fs-700: clamp(27px, 3.2vw, 40px);
  --fs-600: clamp(22px, 2.2vw, 28px);
  --fs-500: 20px;
  --fs-400: 17px;
  --fs-300: 15px;
  --fs-200: 13px;

  --shell-max: 1368px;
  --gutter: 28px;
  --capsule: 999px;
  --crest: 8px;
}

/* --- 02 重置与底色 ------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  background: var(--ink);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  background: transparent;
  color: var(--white);
  font-family: var(--font-body);
  font-size: var(--fs-400);
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(201, 191, 166, 0.05) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(201, 191, 166, 0.05) 0 1px, transparent 1px 72px),
    radial-gradient(120% 80% at 78% -10%, rgba(31, 184, 160, 0.07) 0%, transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(226, 87, 30, 0.06) 0%, transparent 58%);
}

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

ul,
ol { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

p { margin: 0; }

a { color: inherit; }

button { font: inherit; }

::selection { background: var(--orange); color: var(--ink); }

#main-content { scroll-margin-top: 96px; }

/* --- 03 排版 ------------------------------------------------------------- */
.display-1 { font-size: var(--fs-900); }
.display-2 { font-size: var(--fs-800); }
.display-3 { font-size: var(--fs-700); }
.display-4 { font-size: var(--fs-600); }

.mono-num,
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.num { color: var(--teal); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--seam);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--sand);
}

.prose {
  max-width: 46ch;
  font-size: var(--fs-400);
  line-height: 1.7;
  color: var(--text-soft);
}

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

.prose strong { color: var(--white); font-weight: 700; }

/* --- 04 布局 ------------------------------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 9vw, 128px); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

/* --- 05 通用按钮 --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: var(--fs-300);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn--primary {
  background: var(--orange);
  color: var(--ink);
}

.btn--primary:hover { background: var(--flare); }

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

.btn--ghost:hover {
  border-color: var(--sand);
  background: rgba(201, 191, 166, 0.08);
}

/* --- 06 面包屑 ----------------------------------------------------------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--brick-mid);
}

.breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.18s ease;
}

.breadcrumb a:hover { color: var(--teal); }

.breadcrumb [aria-current="page"] { color: var(--sand); }

/* --- 07 卡片与通用块 ----------------------------------------------------- */
.card {
  position: relative;
  display: block;
  padding: 22px;
  background: var(--brick-dark);
  border: 1px solid var(--line-faint);
  border-radius: 0;
  color: inherit;
  text-decoration: none;
  transition: transform 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

/* --- 08 图片容器基础规则 ------------------------------------------------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  background-color: var(--brick-dark);
  background-image:
    linear-gradient(135deg, rgba(201, 191, 166, 0.1) 0%, rgba(201, 191, 166, 0) 62%),
    repeating-linear-gradient(90deg, rgba(201, 191, 166, 0.07) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(201, 191, 166, 0.07) 0 1px, transparent 1px 48px);
  border: 1px solid var(--line-faint);
  border-radius: 0;
}

.media > img,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.05);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--3x2 { aspect-ratio: 3 / 2; }
.media--square { aspect-ratio: 1 / 1; }

.media--crest {
  aspect-ratio: 1 / 1;
  border-radius: var(--crest);
}

.media--shade::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(20, 23, 26, 0) 40%, rgba(20, 23, 26, 0.84) 100%);
  pointer-events: none;
}

.media-label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 7px 12px;
  background: rgba(20, 23, 26, 0.86);
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.1em;
  color: var(--white);
}

/* --- 09 横向滑动轨道 ----------------------------------------------------- */
.rail {
  display: flex;
  gap: 20px;
  padding-block: 6px 22px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-color: var(--brick-mid) transparent;
  scrollbar-width: thin;
}

.rail::-webkit-scrollbar { height: 6px; }
.rail::-webkit-scrollbar-track { background: transparent; }
.rail::-webkit-scrollbar-thumb { background: var(--brick-mid); }

.rail-item {
  flex: 0 0 clamp(232px, 28vw, 336px);
  scroll-snap-align: start;
}

/* --- 10 主题筛选 --------------------------------------------------------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-block: 16px;
  border-top: 1px solid var(--line-faint);
  border-bottom: 1px solid var(--line-faint);
}

.filter-btn {
  padding: 8px 15px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.filter-btn:hover {
  border-color: var(--line-strong);
  color: var(--white);
}

.filter-btn[aria-pressed="true"] {
  background: var(--sand);
  border-color: var(--sand);
  color: var(--ink);
}

.filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.08em;
  color: var(--teal);
}

/* --- 11 滚动显现 --------------------------------------------------------- */
html.js-motion .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}

html.js-motion .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* --- 12 站点头部 --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(20, 23, 26, 0.9);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line-faint);
}

.skip-link {
  position: absolute;
  top: -64px;
  left: 20px;
  z-index: 300;
  padding: 11px 20px;
  background: var(--orange);
  color: var(--ink);
  font-size: var(--fs-300);
  font-weight: 700;
  text-decoration: none;
  border-radius: 0;
  transition: top 0.2s ease;
}

.skip-link:focus { top: 14px; }

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 5;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 15px var(--gutter);
  transition: padding-top 0.26s ease, padding-bottom 0.26s ease;
}

.site-header[data-scrolled="true"] .header-shell {
  padding-top: 8px;
  padding-bottom: 8px;
}

/* 字标 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: var(--white);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  background: var(--orange);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(20, 23, 26, 0.6);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.02em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.22em;
  color: var(--seam);
}

/* 悬浮胶囊导航 */
.site-nav {
  position: relative;
  margin-inline: auto;
  padding: 5px;
  background: rgba(35, 39, 43, 0.74);
  border: 1px solid var(--line);
  border-radius: var(--capsule);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

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

.nav-link {
  display: block;
  padding: 9px 15px;
  border-radius: var(--capsule);
  color: var(--sand);
  font-size: var(--fs-300);
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease;
}

.nav-link:hover {
  color: var(--white);
  background: rgba(201, 191, 166, 0.1);
}

.nav-link[aria-current="page"] {
  background: var(--orange);
  color: var(--ink);
}

/* 右侧工具 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.qr-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--capsule);
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.qr-trigger:hover {
  border-color: var(--line-strong);
  color: var(--white);
}

.qr-trigger[aria-expanded="true"] {
  border-color: var(--teal);
  color: var(--teal);
}

.qr-trigger-dot {
  width: 6px;
  height: 6px;
  background: var(--teal);
  border-radius: 0;
}

.season-strip {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 13px;
  border: 1px solid var(--line-faint);
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.season-strip-label { color: var(--text-dim); }
.season-strip-value { color: var(--teal); }

.site-header[data-scrolled="true"] .season-strip { display: none; }

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 38px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--sand);
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.nav-toggle:hover {
  border-color: var(--line-strong);
  color: var(--white);
}

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease;
}

.nav-toggle-icon::before { top: -6px; }
.nav-toggle-icon::after { top: 6px; }

/* 手机版扫码面板 */
.qr-panel {
  position: absolute;
  top: calc(100% + 12px);
  right: var(--gutter);
  z-index: 140;
  width: 272px;
  padding: 20px;
  background: var(--brick-dark);
  border: 1px solid var(--line);
  border-radius: 0;
  box-shadow: 0 26px 54px rgba(0, 0, 0, 0.55);
}

.qr-panel[hidden] { display: none; }

.qr-panel-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.16em;
  color: var(--sand);
}

.qr-figure {
  width: 100%;
  aspect-ratio: 1 / 1;
  margin-bottom: 14px;
  background-color: var(--white);
  background-image:
    repeating-linear-gradient(90deg, var(--ink) 0 6px, transparent 6px 12px),
    repeating-linear-gradient(0deg, var(--ink) 0 6px, transparent 6px 12px),
    repeating-linear-gradient(90deg, transparent 0 19px, var(--ink) 19px 25px),
    repeating-linear-gradient(0deg, transparent 0 19px, var(--ink) 19px 25px);
  border: 8px solid var(--white);
}

.qr-panel-note {
  font-size: var(--fs-200);
  line-height: 1.6;
  color: var(--text-dim);
}

/* --- 13 站点页脚 --------------------------------------------------------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 120px);
  padding-top: clamp(48px, 6vw, 76px);
  background: var(--brick-dark);
  border-top: 1px solid var(--line-faint);
}

.footer-shell {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 3fr);
  gap: 48px 56px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-lead { display: flex; flex-direction: column; align-items: flex-start; }

.footer-note {
  margin-top: 20px;
  max-width: 22ch;
  font-size: var(--fs-300);
  line-height: 1.7;
  color: var(--text-dim);
}

.footer-cta {
  display: inline-block;
  margin-top: 22px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--white);
  font-size: var(--fs-300);
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.footer-cta:hover {
  border-color: var(--sand);
  background: rgba(201, 191, 166, 0.08);
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px 24px;
}

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

.footer-col-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--text-dim);
}

.footer-list { display: flex; flex-direction: column; gap: 11px; }

.footer-link {
  color: var(--text-soft);
  font-size: var(--fs-300);
  text-decoration: none;
  transition: color 0.18s ease;
}

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

.footer-data {
  color: var(--text-soft);
  font-size: var(--fs-300);
}

.footer-col--contact .footer-data {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: var(--sand);
  overflow-wrap: anywhere;
}

.footer-footnote {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 28px;
  width: 100%;
  max-width: var(--shell-max);
  margin: 56px auto 0;
  padding: 20px var(--gutter) 26px;
  border-top: 1px solid var(--line-faint);
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.footer-fine { margin: 0; }

/* --- 14 焦点与无障碍 ----------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* --- 15 响应式 ----------------------------------------------------------- */
@media (max-width: 1280px) {
  :root { --gutter: 24px; }
  .season-strip { display: none; }
}

@media (max-width: 1000px) {
  :root { --gutter: 20px; }

  .header-shell {
    justify-content: space-between;
    gap: 10px;
  }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: var(--gutter);
    right: var(--gutter);
    display: none;
    padding: 10px;
    border-radius: 14px;
    background: rgba(28, 32, 36, 0.98);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55);
  }

  .site-nav[data-open="true"] { display: block; }

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

  .nav-link {
    padding: 13px 16px;
    border-radius: 10px;
    font-size: var(--fs-400);
  }

  .footer-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 44px;
  }

  .footer-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .brand-name { font-size: 18px; }
  .brand-sub { display: none; }

  .qr-trigger { padding: 8px 12px; }
  .qr-panel { left: var(--gutter); right: var(--gutter); width: auto; }

  .grid-12 { grid-template-columns: minmax(0, 1fr); }

  .footer-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .footer-footnote {
    flex-direction: column;
    margin-top: 40px;
  }

  .filter-bar { gap: 8px; }
  .filter-count { margin-left: 0; width: 100%; }
}

@media (max-width: 420px) {
  .qr-trigger { font-size: 12px; letter-spacing: 0.04em; }
}

/* --- 16 动效降级 --------------------------------------------------------- */
@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;
  }

  html.js-motion .reveal {
    opacity: 1;
    transform: none;
  }

  .card:hover { transform: none; }
}