/* ==========================================================================
   BEPLAY · /assets/site.css
   共享外壳：色彩变量 / 中文排版 / 左侧导航轨道 / 页脚 / 通用组件
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ol, ul {
  margin: 0;
}

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

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

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

[hidden] { display: none !important; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0B1B2B;
  --ink-deep: #06121D;
  --paper: #F4F1E9;
  --mist: #C9CFD6;
  --graphite: #5A6472;
  --cyan: #22D3C5;
  --cyan-deep: #0E8F87;
  --amber: #FF9A2E;
  --amber-deep: #B25F00;
  --grid: #1E3346;

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

  --rail-w: 272px;
  --bar-h: 60px;
  --maxw: 1240px;
  --gutter: clamp(18px, 4vw, 48px);

  --ease: cubic-bezier(.22, .61, .36, 1);
  --fast: 160ms;
  --mid: 220ms;
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: -1px -1px;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 { font-size: clamp(34px, 6vw, 56px); }
h2 { font-size: clamp(24px, 3.4vw, 28px); }
h3 { font-size: 20px; }

p { max-width: 34em; }

a { color: inherit; text-decoration: none; }

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

main { display: block; }

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  padding: 12px 22px;
  background: var(--cyan);
  color: var(--ink-deep);
  font-weight: 700;
  letter-spacing: .02em;
  transform: translateY(-115%);
  transition: transform var(--fast) var(--ease);
}

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

/* ---------- 5. Header / rail ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-deep);
  border-bottom: 1px solid var(--grid);
}

.rail { position: relative; }

.rail__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--bar-h);
  padding: 10px var(--gutter);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .16em;
  line-height: 1.1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.brand__name::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 9px;
  background: var(--cyan);
  vertical-align: 2px;
}

.brand__line {
  font-size: 11px;
  line-height: 1.45;
  letter-spacing: .02em;
  color: var(--mist);
  opacity: .72;
}

/* 移动抽屉按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--grid);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  transition: border-color var(--fast) var(--ease), color var(--fast) var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--paper); }

.nav-toggle__glyph { position: relative; display: block; width: 14px; height: 10px; }

.nav-toggle__glyph::before,
.nav-toggle__glyph::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform var(--fast) var(--ease), top var(--fast) var(--ease), bottom var(--fast) var(--ease);
}

.nav-toggle__glyph::before { top: 0; }
.nav-toggle__glyph::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__glyph::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph::after { bottom: 5px; transform: rotate(-45deg); }

.nav-toggle__text { line-height: 1; }

/* 导航面板：移动端为抽屉 */
.nav {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 55;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - var(--bar-h));
  overflow-y: auto;
  padding: 0 var(--gutter) 8px;
  background: var(--ink-deep);
  border-bottom: 1px solid var(--grid);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--fast) var(--ease), transform var(--fast) var(--ease), visibility var(--fast) linear;
}

.nav[data-open="true"] {
  visibility: visible;
  opacity: 1;
  transform: none;
}

.nav__meta {
  padding: 15px 0 13px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--grid);
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
  opacity: .68;
}

.nav__list { display: flex; flex-direction: column; }

.nav__item { border-bottom: 1px solid rgba(30, 51, 70, .72); }
.nav__item:last-child { border-bottom: 0; }

.nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0 12px 16px;
  color: var(--mist);
  transition: color var(--fast) var(--ease);
}

.nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform var(--fast) var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible { color: var(--paper); }

.nav__link:hover::before,
.nav__link:focus-visible::before,
.nav__link[aria-current="page"]::before,
.nav__link[data-active="true"]::before { transform: scaleY(1); }

.nav__link[aria-current="page"],
.nav__link[data-active="true"] {
  color: var(--paper);
  font-weight: 700;
}

.nav__index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
  opacity: .58;
}

.nav__label { font-size: 15px; }

.nav__link[aria-current="page"] .nav__index,
.nav__link[data-active="true"] .nav__index { color: var(--cyan); opacity: 1; }

.rail__cta { margin: 20px 0 22px; width: 100%; }

.rail__progress { display: none; }

/* 桌面端：固定左轨 */
@media (min-width: 1024px) {
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    display: flex;
    border-bottom: 0;
    border-right: 1px solid var(--grid);
  }

  .rail {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    padding: 30px 26px 26px;
  }

  .rail__top { display: block; min-height: 0; padding: 0; }

  .nav-toggle { display: none; }

  .brand__line { margin-top: 7px; }

  .nav {
    position: static;
    visibility: visible;
    opacity: 1;
    transform: none;
    max-height: none;
    overflow-y: auto;
    padding: 0;
    margin-top: 30px;
    background: transparent;
    border-bottom: 0;
    flex: 1 1 auto;
    transition: none;
  }

  .nav__meta { margin-bottom: 20px; }

  .rail__cta {
    margin: auto 0 0;
    flex: none;
  }

  .rail__progress {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 2px;
    height: 100%;
    background: var(--cyan);
    transform: scaleY(0);
    transform-origin: top center;
    will-change: transform;
  }
}

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .01em;
  line-height: 1.3;
  text-align: center;
  transition: background-color var(--fast) var(--ease), color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.btn--accent {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink-deep);
}

.btn--accent:hover {
  background: transparent;
  color: var(--amber);
}

.btn--solid {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-deep);
}

.btn--solid:hover {
  background: transparent;
  color: var(--cyan);
}

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

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

/* ---------- 7. Layout helpers / surfaces ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(44px, 7vw, 88px); }

.reading { max-width: 34em; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

.surface-paper a { color: var(--cyan-deep); }

.surface-paper :focus-visible { outline-color: var(--cyan-deep); }

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

/* ---------- 8. Common components ---------- */
.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--cyan);
}

.surface-paper .eyebrow { color: var(--cyan-deep); }

.panel {
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--grid);
  background: var(--ink-deep);
}

.surface-paper .panel {
  border-color: var(--mist);
  background: #FFFFFF;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(48px, 9vw, 120px);
  line-height: .94;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

.surface-paper .stat__num { color: var(--ink); }

.stat__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

.surface-paper .stat__label { color: var(--graphite); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--mist);
}

.tag::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  background: currentColor;
}

.tag--stock { color: var(--cyan); }
.tag--price { color: var(--amber); }
.tag--pending { color: var(--mist); }

.surface-paper .tag--stock { color: var(--cyan-deep); }
.surface-paper .tag--price { color: var(--amber-deep); }
.surface-paper .tag--pending { color: var(--graphite); }

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}

.table th,
.table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--grid);
  text-align: left;
  vertical-align: top;
}

.table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--mist);
  border-bottom-color: var(--mist);
}

.table tbody tr:hover { background: rgba(34, 211, 197, .07); }

.table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.surface-paper .table th,
.surface-paper .table td { border-bottom-color: var(--mist); }

.surface-paper .table thead th { color: var(--graphite); }

.surface-paper .table tbody tr:hover { background: rgba(14, 143, 135, .08); }

/* 主题筛选 */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter {
  padding: 8px 14px;
  border: 1px solid var(--grid);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  transition: border-color var(--fast) var(--ease), color var(--fast) var(--ease), background-color var(--fast) var(--ease);
}

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

.filter.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-deep);
}

.surface-paper .filter { border-color: var(--mist); color: var(--graphite); }
.surface-paper .filter:hover { border-color: var(--cyan-deep); color: var(--ink); }
.surface-paper .filter.is-active { background: var(--cyan-deep); border-color: var(--cyan-deep); color: #FFFFFF; }

.filters__count {
  margin-top: 12px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
  color: var(--mist);
  opacity: .8;
}

/* 显现 */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--mid) var(--ease), transform var(--mid) var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* 面包屑 */
.crumbs {
  padding: 18px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--mist);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.crumbs li { display: inline-flex; gap: 8px; }

.crumbs li::after { content: "/"; opacity: .5; }
.crumbs li:last-child::after { display: none; }

.crumbs a { color: inherit; opacity: .85; transition: color var(--fast) var(--ease), opacity var(--fast) var(--ease); }
.crumbs a:hover { color: var(--cyan); opacity: 1; }

.surface-paper .crumbs { color: var(--graphite); }
.surface-paper .crumbs a:hover { color: var(--cyan-deep); }

/* 图片容器 */
.frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--grid);
  background: var(--ink-deep);
}

.frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.frame--wide { aspect-ratio: 16 / 9; }
.frame--square { aspect-ratio: 1 / 1; }
.frame--tall { aspect-ratio: 3 / 4; }

.frame__cap {
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
  opacity: .68;
}

.surface-paper .frame { border-color: var(--mist); }
.surface-paper .frame__cap { color: var(--graphite); }

/* ---------- 9. Footer ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  padding: clamp(40px, 6vw, 76px) var(--gutter) 0;
  background: var(--ink-deep);
  border-top: 1px solid var(--grid);
  color: var(--mist);
}

.footer__inner {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  max-width: var(--maxw);
  margin-inline: auto;
}

.footer__brand { min-width: 0; }

.footer__name {
  max-width: none;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .16em;
  line-height: 1.1;
  color: var(--paper);
}

.footer__slogan {
  margin-top: 9px;
  max-width: none;
  font-size: 14px;
  color: var(--mist);
}

.footer__note {
  margin-top: 14px;
  max-width: 30em;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  opacity: .68;
}

.footer__nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px 32px;
}

.footer__col { min-width: 0; }

.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--paper);
  opacity: .55;
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer__list a {
  font-size: 14px;
  color: var(--mist);
  transition: color var(--fast) var(--ease);
}

.footer__list a:hover { color: var(--cyan); }

.footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 32px;
  max-width: var(--maxw);
  margin: clamp(34px, 5vw, 58px) auto 0;
  padding: 22px 0 32px;
  border-top: 1px solid var(--grid);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  opacity: .74;
}

.footer__contact {
  max-width: none;
  font-family: var(--font-mono);
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
}

.footer__address { max-width: none; }

.footer__legal {
  max-width: none;
  font-family: var(--font-mono);
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 640px) {
  .footer__nav { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 640px) and (max-width: 899px) {
  .footer__brand { grid-column: 1 / -1; }
}

@media (min-width: 900px) {
  .footer__inner { grid-template-columns: minmax(260px, 1fr) minmax(0, 2fr); }
}

/* ---------- 10. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0ms !important;
  }

  html.js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}