/* ============================================================
   万博游艺 · MAX 坐标  /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { 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; }
a { color: inherit; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. Tokens ---------- */
:root {
  --paper-050: #F7F2E8;
  --paper-100: #F1EADD;
  --paper-200: #E8DECB;
  --ink-900: #14110F;
  --ink-700: #2A2521;
  --ink-600: #46403A;
  --cinnabar-600: #B23A2F;
  --cinnabar-700: #8F2C23;
  --cinnabar-100: #F3D9D2;
  --bamboo-600: #47735F;
  --bamboo-100: #DCE7E0;
  --gold-500: #E0A63C;
  --gold-700: #8A5A14;
  --gold-100: #F7E8C8;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", "JetBrains Mono", Consolas, monospace;

  --wrap: 1264px;
  --header-h: 88px;
  --header-h-compact: 66px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .28s;
  --line: 1px solid rgba(20, 17, 15, .14);
  --shadow-card: 0 18px 40px -34px rgba(20, 17, 15, .85);
  --scroll-progress: 0%;
}

/* ---------- 3. Base ---------- */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-900);
  background-color: var(--paper-050);
  background-image:
    linear-gradient(to right, rgba(20, 17, 15, .032) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 17, 15, .032) 1px, transparent 1px);
  background-size: 84px 84px;
  padding-top: var(--header-h);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: .01em;
}

h1 { font-size: clamp(38px, 6.4vw, 96px); font-weight: 300; letter-spacing: .02em; }
h2 { font-size: clamp(26px, 3.4vw, 44px); font-weight: 300; }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: 16px; font-weight: 600; }

a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

[id] { scroll-margin-top: calc(var(--header-h) + 18px); }

#main-content:focus { outline: none; }

/* ---------- 4. Focus & a11y ---------- */
:focus-visible {
  outline: 2px solid var(--ink-900);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px rgba(224, 166, 60, .5);
  border-radius: 2px;
}
.site-footer :focus-visible {
  outline-color: var(--gold-500);
  box-shadow: 0 0 0 5px rgba(224, 166, 60, .26);
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 999;
  padding: 11px 20px;
  background: var(--ink-900);
  color: var(--paper-050);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-decoration: none;
  border-radius: 2px;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 5. Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 48px);
}
.container--narrow { max-width: 920px; }

.section { padding-block: clamp(64px, 9vw, 140px); }
.section--tight { padding-block: clamp(48px, 6vw, 88px); }
.section--paper { background: var(--paper-100); }
.section--ink { background: var(--ink-900); color: var(--paper-050); }
.section--ink .eyebrow { color: var(--gold-500); }
.section--ink .prose a { color: var(--gold-500); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cinnabar-600);
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: currentColor; }

.tag {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .13em;
  line-height: 1.6;
  color: var(--ink-600);
  background: var(--paper-050);
  border: 1px solid rgba(20, 17, 15, .18);
}
.tag--gold { background: var(--gold-100); border-color: rgba(138, 90, 20, .35); color: var(--gold-700); }
.tag--cinnabar { background: var(--cinnabar-100); border-color: rgba(178, 58, 47, .3); color: var(--cinnabar-700); }
.tag--bamboo { background: var(--bamboo-100); border-color: rgba(71, 115, 95, .34); color: var(--bamboo-600); }

.prose { max-width: 38em; }
.prose > * + * { margin-top: 1.15em; }
.prose h2, .prose h3 { margin-top: 1.9em; }
.prose a { color: var(--bamboo-600); }
.prose ul, .prose ol { display: flex; flex-direction: column; gap: .5em; }
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .86em;
  width: 9px;
  height: 1px;
  background: var(--cinnabar-600);
}
.prose ol { counter-reset: step; }
.prose ol li { position: relative; padding-left: 28px; counter-increment: step; }
.prose ol li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cinnabar-600);
}
.prose blockquote {
  border-left: 2px solid var(--cinnabar-600);
  padding-left: 20px;
  color: var(--ink-600);
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.7;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-600);
}
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--cinnabar-600); }
.breadcrumb__sep { color: rgba(20, 17, 15, .35); }
.breadcrumb [aria-current="page"] { color: var(--ink-900); }

.grid { display: grid; gap: clamp(18px, 2.4vw, 30px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.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; }

.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 32px);
  background: var(--paper-050);
  border: 1px solid rgba(20, 17, 15, .14);
  box-shadow: var(--shadow-card);
  min-width: 0;
}
.card--tint { background: var(--cinnabar-100); border-color: rgba(178, 58, 47, .24); }
.card--cut { clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%); }

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--paper-200);
  border: 1px solid rgba(20, 17, 15, .12);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--cut { clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%); }
.media-frame--ratio { aspect-ratio: 4 / 3; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--placeholder {
  background-image: repeating-linear-gradient(45deg, rgba(20, 17, 15, .07) 0 1px, transparent 1px 14px);
}
.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  background: var(--ink-900);
  color: var(--paper-050);
}

/* ---------- 6. Buttons ---------- */
.btn {
  --btn-bg: var(--ink-900);
  --btn-fg: var(--paper-050);
  --btn-bd: var(--ink-900);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: 13.5px;
  letter-spacing: .08em;
  line-height: 1.2;
  text-decoration: none;
  border-radius: 2px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--gold {
  --btn-bg: var(--gold-500);
  --btn-fg: #251A06;
  --btn-bd: #C4892A;
}
.btn--gold:hover { --btn-bg: #EDB44F; }
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink-900);
  --btn-bd: rgba(20, 17, 15, .35);
}
.btn--ghost:hover { --btn-bg: var(--paper-200); }
.btn--sm { padding: 9px 16px; font-size: 12.5px; }

/* ---------- 7. Filter bar ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-btn {
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-600);
  border: 1px solid rgba(20, 17, 15, .22);
  background: transparent;
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.filter-btn:hover { background: var(--paper-200); color: var(--ink-900); }
.filter-btn[aria-pressed="true"] {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper-050);
}

/* ---------- 8. Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  background: rgba(247, 242, 232, .62);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid rgba(20, 17, 15, .1);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.site-header.is-solid {
  background-color: rgba(247, 242, 232, .97);
  box-shadow: 0 16px 36px -32px rgba(20, 17, 15, 1);
}
.site-header::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 3px;
  width: var(--scroll-progress);
  background: linear-gradient(90deg, var(--cinnabar-600), var(--gold-500));
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 28px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 48px);
  min-height: var(--header-h);
  transition: min-height var(--dur) var(--ease);
}
.site-header.is-solid .site-header__inner { min-height: var(--header-h-compact); }

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  flex: 0 0 auto;
  margin-right: auto;
  text-decoration: none;
}
.brand__glyph {
  position: relative;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  border: 1px solid rgba(20, 17, 15, .32);
  transition: transform .4s var(--ease);
}
.brand:hover .brand__glyph { transform: rotate(45deg); }
.brand__glyph::before,
.brand__glyph::after { content: ""; position: absolute; background: var(--cinnabar-600); }
.brand__glyph::before { left: 50%; top: -6px; bottom: -6px; width: 1px; transform: translateX(-50%); }
.brand__glyph::after { top: 50%; left: -6px; right: -6px; height: 1px; transform: translateY(-50%); }
.brand__node {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cinnabar-600);
  transform: translate(-50%, -50%);
}
.brand__text { display: flex; flex-direction: column; gap: 2px; line-height: 1.1; }
.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--ink-900);
}
.brand__descriptor {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-600);
}

.nav { display: flex; align-items: center; }
.nav__list { display: flex; align-items: center; gap: 2px; }
.nav__item { flex: 0 0 auto; }
.nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 13px;
  font-size: 13.5px;
  letter-spacing: .07em;
  color: var(--ink-700);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 4px;
  height: 2px;
  background: var(--cinnabar-600);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s var(--ease);
}
.nav__link:hover { color: var(--ink-900); }
.nav__link:hover::after { transform: scaleX(.4); }
.nav__link[aria-current="page"] { color: var(--cinnabar-600); }
.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.nav__foot { display: none; }
.nav__meta {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--ink-600);
}

.header-actions { display: flex; align-items: center; gap: 10px; margin-left: 6px; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink-900);
  border: 1px solid rgba(20, 17, 15, .28);
  border-radius: 2px;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-toggle:hover { background: var(--paper-200); }
.nav-toggle__bars { display: flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(2.75px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-2.75px) rotate(-45deg); }
.nav-toggle__label { display: inline-block; }

/* ---------- 9. Footer ---------- */
.site-footer {
  position: relative;
  background: var(--ink-900);
  color: rgba(247, 242, 232, .8);
}
.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--cinnabar-600) 0%,
    var(--cinnabar-600) 34%,
    var(--gold-500) 34%,
    var(--gold-500) 43%,
    var(--bamboo-600) 43%,
    var(--bamboo-600) 100%
  );
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.05fr) minmax(0, 1.15fr);
  gap: clamp(28px, 4vw, 64px);
  padding-block: clamp(48px, 6vw, 84px) clamp(32px, 4vw, 56px);
}

.site-footer__brand { display: flex; flex-direction: column; min-width: 0; }
.site-footer__brandline {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: .1em;
  color: var(--paper-050);
}
.site-footer__slogan {
  margin-top: 14px;
  max-width: 22em;
  font-size: 13.5px;
  line-height: 1.9;
  letter-spacing: .04em;
  color: rgba(247, 242, 232, .6);
}
.site-footer__coord {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: auto;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--gold-500);
}
.site-footer__coord span { display: inline-flex; align-items: center; gap: 8px; }
.site-footer__coord span::before {
  content: "";
  width: 6px;
  height: 6px;
  border: 1px solid currentColor;
  transform: rotate(45deg);
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 44px);
}
.site-footer__col { min-width: 0; }
.site-footer__title {
  margin-bottom: 18px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold-500);
  border-bottom: 1px solid rgba(247, 242, 232, .16);
}
.site-footer__list { display: flex; flex-direction: column; gap: 11px; }
.site-footer__link {
  display: inline-block;
  font-size: 14px;
  letter-spacing: .05em;
  color: rgba(247, 242, 232, .78);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.site-footer__link::before { content: "·"; margin-right: 8px; color: var(--cinnabar-600); }
.site-footer__link:hover { color: var(--gold-500); transform: translateX(3px); }

.site-footer__contact {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
}
.site-footer__contactlist {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 22px;
  width: 100%;
}
.site-footer__contact-line {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 13.5px;
  letter-spacing: .03em;
  color: rgba(247, 242, 232, .84);
  overflow-wrap: anywhere;
}
.site-footer__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: rgba(247, 242, 232, .46);
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  padding-block: 22px 32px;
  border-top: 1px solid rgba(247, 242, 232, .14);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(247, 242, 232, .54);
}
.site-footer__icp { white-space: nowrap; }
.site-footer__legal { display: flex; flex-wrap: wrap; gap: 18px; }
.site-footer__legal-link {
  color: rgba(247, 242, 232, .74);
  text-decoration: none;
  border-bottom: 1px solid rgba(247, 242, 232, .28);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.site-footer__legal-link:hover { color: var(--gold-500); border-color: var(--gold-500); }
.site-footer__note {
  flex-basis: 100%;
  font-size: 10.5px;
  letter-spacing: .08em;
  color: rgba(224, 166, 60, .88);
}
.site-footer__copy { margin-left: auto; white-space: nowrap; }

/* ---------- 10. Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 11. Responsive ---------- */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: block;
    max-height: calc(100vh - var(--header-h));
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    padding: 10px clamp(20px, 5vw, 48px) 32px;
    background: var(--paper-050);
    border-bottom: 1px solid rgba(20, 17, 15, .16);
    box-shadow: 0 34px 44px -38px rgba(20, 17, 15, 1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s linear;
  }
  .site-header.is-solid .nav { top: var(--header-h-compact); }
  .nav[data-open="true"] { opacity: 1; visibility: visible; transform: none; }

  .nav__list { flex-direction: column; align-items: stretch; gap: 0; padding-top: 6px; }
  .nav__link {
    display: block;
    padding: 15px 2px;
    font-size: 15.5px;
    letter-spacing: .1em;
    border-bottom: 1px solid rgba(20, 17, 15, .1);
  }
  .nav__link::after { display: none; }
  .nav__link[aria-current="page"] { color: var(--cinnabar-600); }
  .nav__link[aria-current="page"]::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 10px;
    vertical-align: 1px;
    background: var(--cinnabar-600);
  }
  .nav__foot {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 24px;
  }
  body.nav-open { overflow: hidden; }
}

@media (max-width: 960px) {
  .site-footer__top { grid-template-columns: minmax(0, 1fr); }
  .site-footer__coord { margin-top: 4px; }
  .site-footer__copy { margin-left: 0; }
}

@media (max-width: 900px) {
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  :root { --header-h: 74px; --header-h-compact: 62px; }
  .brand__descriptor { display: none; }
  .brand__name { font-size: 17px; letter-spacing: .14em; }
  .site-footer__nav { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .site-footer__base { font-size: 10.5px; gap: 10px 18px; }
  .site-footer__legal { gap: 14px; }
}

@media (max-width: 400px) {
  .nav-toggle__label { display: none; }
}

/* ---------- 12. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .btn:hover, .site-footer__link:hover { transform: none; }
  .brand:hover .brand__glyph { transform: none; }
}