/* =========================================================
   必一娱乐赛场 · 全站共享样式 /assets/site.css
   01 reset  02 tokens  03 base  04 layout  05 section
   06 sheet  07 tags  08 buttons  09 frame  10 filter
   11 header  12 footer  13 a11y  14 responsive
   ========================================================= */

/* ---------- 01 reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; 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%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { width: 100%; border-collapse: collapse; }
[hidden] { display: none !important; }

/* ---------- 02 tokens ---------- */
:root {
  --night: #101C33;
  --night-2: #1B2E4D;
  --lake: #2E9B8F;
  --lake-pale: #A8DAD3;
  --signal: #F26430;
  --signal-dark: #D24E1C;
  --clay: #C4694A;
  --rock: #6E6A62;
  --moss: #5B7A4F;
  --paper: #F4F1E8;
  --paper-lift: #FBF9F3;
  --edge: #D8D2C4;

  --u13: #F2C230;
  --u14: #F28C28;
  --u15: #E4572E;
  --u16: #2E9B8F;
  --u17: #3B6FB6;
  --u19: #B03A5B;

  --font-display: "Barlow Condensed", "Oswald", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;

  --measure: 1180px;
  --gutter: clamp(18px, 4vw, 44px);
  --rail: 84px;
  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --shadow-sheet: 0 1px 0 rgba(216, 210, 196, .9), 0 14px 30px -22px rgba(16, 28, 51, .55);
  --hair: rgba(16, 28, 51, .14);
  --hair-dark: rgba(216, 210, 196, .2);
}

/* ---------- 03 base ---------- */
body {
  min-height: 100vh;
  background: var(--paper);
  color: var(--night);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: .01em;
}

:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
::selection { background: var(--lake); color: #FFFFFF; }

.skip-link {
  position: fixed;
  top: -72px;
  left: 12px;
  z-index: 300;
  padding: 11px 18px;
  background: var(--signal);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  border-radius: var(--radius);
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 04 layout ---------- */
.wrap {
  width: min(var(--measure), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}
.wrap--narrow {
  width: min(780px, calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}
.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.rule { height: 1px; margin: 0; border: 0; background: var(--hair); }

.prose { max-width: 72ch; }
.prose p + p { margin-top: 1.1em; }
.prose h2 { margin-top: 2.2em; margin-bottom: .6em; }
.prose h3 { margin-top: 1.7em; margin-bottom: .45em; }
.prose ul { margin: 1em 0; padding-left: 1.25em; list-style: disc; }
.prose ol { margin: 1em 0; padding-left: 1.4em; list-style: decimal; }
.prose li { margin-bottom: .5em; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.breadcrumb {
  margin-top: clamp(16px, 2vw, 26px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--rock);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--edge); }
.breadcrumb a { color: var(--lake); transition: color .18s var(--ease); }
.breadcrumb a:hover { color: var(--signal); }

/* ---------- 05 section ---------- */
.section {
  padding: clamp(46px, 6.5vw, 92px) 0;
  border-top: 1px solid var(--hair);
}
.section:first-of-type { border-top: 0; }

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 30px);
  align-items: start;
  margin-bottom: clamp(26px, 3.4vw, 46px);
}
.section-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 4.6vw, 3.6rem);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--edge);
}
.section-eyebrow {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lake);
}
.section-title { font-size: clamp(1.6rem, 3.6vw, 2.6rem); }
.section-lede {
  max-width: 56ch;
  margin-top: 12px;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.9;
  color: var(--rock);
}

.section--night {
  background: var(--night);
  color: var(--paper);
  border-top-color: var(--hair-dark);
}
.section--night .section-num { color: rgba(168, 218, 211, .3); }
.section--night .section-lede { color: rgba(244, 241, 232, .62); }
.section--night .rule { background: var(--hair-dark); }

/* ---------- 06 sheet ---------- */
.sheet {
  position: relative;
  padding: clamp(18px, 2.6vw, 30px);
  background: var(--paper-lift);
  color: var(--night);
  border: 1px solid var(--edge);
  box-shadow: var(--shadow-sheet);
}
.sheet::before {
  content: "";
  position: absolute;
  left: -1px; top: -1px;
  width: 38px; height: 4px;
  background: var(--lake);
}
.sheet--night {
  background: var(--night-2);
  border-color: rgba(216, 210, 196, .22);
  color: var(--paper);
  box-shadow: none;
}
.sheet--night::before { background: var(--signal); }

.sheet-title {
  margin-bottom: 10px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  line-height: 1.25;
}
.sheet-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 16px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--edge);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--rock);
}
.sheet--night .sheet-meta {
  border-top-color: rgba(216, 210, 196, .24);
  color: rgba(244, 241, 232, .5);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

/* ---------- 07 tags ---------- */
.label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--rock);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: .1em;
  color: var(--lake);
  background: rgba(46, 155, 143, .08);
}
.tag--signal { color: var(--signal); background: rgba(242, 100, 48, .1); }
.tag--clay { color: var(--clay); background: rgba(196, 105, 74, .1); }
.tag--moss { color: var(--moss); background: rgba(91, 122, 79, .1); }
.tag--u13 { color: #8A6A00; background: rgba(242, 194, 48, .18); }
.tag--u14 { color: #A55B00; background: rgba(242, 140, 40, .14); }
.tag--u15 { color: #B03A20; background: rgba(228, 87, 46, .13); }
.tag--u16 { color: #1F6F66; background: rgba(46, 155, 143, .14); }
.tag--u17 { color: #2B5288; background: rgba(59, 111, 182, .13); }
.tag--u19 { color: #8A2846; background: rgba(176, 58, 91, .13); }

/* ---------- 08 buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--night);
  border-radius: var(--radius);
  background: transparent;
  color: var(--night);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .08em;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.btn:hover { background: var(--night); border-color: var(--night); color: var(--paper); }
.btn--signal { background: var(--signal); border-color: var(--signal); color: #FFFFFF; }
.btn--signal:hover { background: var(--signal-dark); border-color: var(--signal-dark); color: #FFFFFF; }
.btn--ghost { border-color: rgba(244, 241, 232, .42); color: var(--paper); }
.btn--ghost:hover { background: var(--paper); border-color: var(--paper); color: var(--night); }

/* ---------- 09 frame ---------- */
.frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--hair-dark);
  background: linear-gradient(155deg, var(--night-2) 0%, var(--night) 72%);
}
.frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(168, 218, 211, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 218, 211, .07) 1px, transparent 1px);
  background-size: 34px 34px;
}
.frame--turf { background: linear-gradient(155deg, #1E4437 0%, var(--night) 78%); }
.frame--paper { background: linear-gradient(155deg, #E9E4D6 0%, #DED8C8 100%); border-color: var(--edge); }
.frame--paper::after {
  background-image:
    linear-gradient(rgba(16, 28, 51, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 28, 51, .05) 1px, transparent 1px);
}
.frame > img { width: 100%; height: 100%; object-fit: cover; }
.frame--16x9 { aspect-ratio: 16 / 9; }
.frame--4x3 { aspect-ratio: 4 / 3; }
.frame--3x2 { aspect-ratio: 3 / 2; }
.frame--1x1 { aspect-ratio: 1 / 1; }
.frame-cap {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 9px 12px;
  background: linear-gradient(0deg, rgba(16, 28, 51, .84), rgba(16, 28, 51, 0));
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

/* ---------- 10 filter ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.filter-label {
  margin-right: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--rock);
}
.filter-btn {
  padding: 8px 13px;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: transparent;
  color: var(--rock);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.filter-btn:hover { border-color: var(--lake); color: var(--lake); }
.filter-btn[aria-pressed="true"] { background: var(--night); border-color: var(--night); color: var(--paper); }
.filter-count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--lake);
}

/* ---------- 11 header ---------- */
.site-header {
  position: relative;
  z-index: 50;
  color: var(--paper);
  background:
    radial-gradient(120% 150% at 50% -25%, rgba(46, 155, 143, .2) 0%, rgba(16, 28, 51, 0) 62%),
    var(--night);
  border-bottom: 1px solid rgba(216, 210, 196, .18);
}

.brand-rail { display: none; }

.rail-mark {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1;
  letter-spacing: .34em;
  color: var(--paper);
}
.rail-season {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--lake-pale);
}

.masthead {
  width: min(var(--measure), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  padding: clamp(24px, 3.6vw, 42px) 0 clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.topline {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lake-pale);
}
.topline::before,
.topline::after {
  content: "";
  width: 20px;
  height: 1px;
  background: currentColor;
  opacity: .45;
}

.brand {
  margin-top: clamp(10px, 1.6vw, 18px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 5.6vw, 3.4rem);
  line-height: 1.04;
  letter-spacing: .06em;
  color: var(--paper);
  transition: color .18s var(--ease);
}
.brand:hover { color: var(--lake-pale); }

.tagline {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: clamp(12.5px, 1.4vw, 14.5px);
  letter-spacing: .26em;
  color: rgba(244, 241, 232, .6);
}

.nav-toggle { display: none; }
.nav-toggle-text { font-size: 12px; letter-spacing: .18em; }
.nav-toggle-icon { display: none; }

.primary-nav {
  width: 100%;
  margin-top: clamp(16px, 2.4vw, 26px);
  border-top: 1px solid rgba(216, 210, 196, .18);
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(4px, 2vw, 28px);
  padding: clamp(10px, 1.4vw, 15px) 0;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 7px 3px;
  font-size: 13px;
  letter-spacing: .14em;
  color: rgba(244, 241, 232, .72);
  transition: color .18s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--lake);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}
.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--paper); }
.nav-link[aria-current="page"]::after { background: var(--signal); transform: scaleX(1); }

.quick-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  padding: clamp(4px, 1vw, 10px) 0 clamp(18px, 2.4vw, 26px);
}
.quick-action {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid rgba(168, 218, 211, .38);
  border-radius: var(--radius);
  color: rgba(244, 241, 232, .82);
  font-size: 12px;
  letter-spacing: .14em;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.quick-action:hover { background: var(--lake); border-color: var(--lake); color: #06231F; }
.quick-action--signal { border-color: rgba(242, 100, 48, .55); color: #FFD6C6; }
.quick-action--signal:hover { background: var(--signal); border-color: var(--signal); color: #FFFFFF; }

/* ---------- 12 footer ---------- */
.site-footer {
  position: relative;
  padding: 0 0 clamp(26px, 3.4vw, 40px);
  background: var(--night);
  color: rgba(244, 241, 232, .78);
}
.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg,
    var(--u13) 0 16.666%,
    var(--u14) 16.666% 33.333%,
    var(--u15) 33.333% 50%,
    var(--u16) 50% 66.666%,
    var(--u17) 66.666% 83.333%,
    var(--u19) 83.333% 100%);
}
.footer-inner {
  width: min(var(--measure), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  padding-top: clamp(30px, 4vw, 54px);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.35fr);
  gap: clamp(26px, 3.6vw, 60px);
  align-items: start;
}
.footer-brand-block { min-width: 0; }
.footer-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.15;
  letter-spacing: .06em;
  color: var(--paper);
}
.footer-brand-sub {
  margin-top: 9px;
  font-family: var(--font-serif);
  font-size: 13.5px;
  line-height: 1.85;
  letter-spacing: .08em;
  color: rgba(244, 241, 232, .56);
}
.footer-service {
  max-width: 40ch;
  margin-top: 18px;
  padding-left: 14px;
  border-left: 2px solid var(--lake);
  font-size: 13px;
  line-height: 1.9;
  color: rgba(244, 241, 232, .5);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 30px);
}
.footer-col { min-width: 0; }
.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--lake-pale);
}
.footer-col-title::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin-top: 10px;
  background: var(--signal);
}
.footer-link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(244, 241, 232, .72);
  transition: color .18s var(--ease);
}
.footer-link:hover { color: var(--lake-pale); }

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(18px, 3vw, 40px);
  margin-top: clamp(28px, 3.6vw, 44px);
  padding-top: 22px;
  border-top: 1px solid rgba(216, 210, 196, .16);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .04em;
  color: rgba(244, 241, 232, .62);
}
.footer-contact-item { display: inline-block; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  margin-top: 18px;
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(244, 241, 232, .4);
}
.footer-legal-item { display: inline-block; }

/* ---------- 13 a11y / motion ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- 14 responsive ---------- */
@media (max-width: 1023px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail); }
  .brand-rail {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 60;
    display: flex;
    width: var(--rail);
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 30px 0 24px;
    background:
      repeating-linear-gradient(180deg, rgba(168, 218, 211, .07) 0 1px, transparent 1px 14px),
      linear-gradient(180deg, #0A1322 0%, #101C33 46%, #172740 100%);
    border-right: 1px solid rgba(216, 210, 196, .16);
  }
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    padding: 10px 16px;
    border: 1px solid rgba(216, 210, 196, .32);
    border-radius: var(--radius);
    color: var(--paper);
    transition: border-color .18s var(--ease), color .18s var(--ease);
  }
  .nav-toggle:hover { border-color: var(--lake-pale); color: var(--lake-pale); }
  .nav-toggle-icon {
    position: relative;
    display: inline-block;
    width: 14px;
    height: 10px;
  }
  .nav-toggle-icon::before,
  .nav-toggle-icon::after {
    content: "";
    position: absolute;
    left: 0; right: 0;
    height: 1.5px;
    background: currentColor;
    transition: transform .18s var(--ease), top .18s var(--ease), bottom .18s var(--ease);
  }
  .nav-toggle-icon::before { top: 0; }
  .nav-toggle-icon::after { bottom: 0; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { top: 4px; transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { bottom: 4px; transform: rotate(-45deg); }

  .primary-nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    z-index: 80;
    width: auto;
    margin-top: 0;
    padding: 8px var(--gutter) 18px;
    background: var(--night-2);
    border-top: 1px solid rgba(216, 210, 196, .22);
    border-bottom: 1px solid rgba(216, 210, 196, .22);
    box-shadow: 0 30px 46px -30px rgba(0, 0, 0, .85);
  }
  .primary-nav[data-open] { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding: 0; }
  .nav-link {
    display: block;
    padding: 15px 4px;
    border-bottom: 1px solid rgba(216, 210, 196, .13);
    font-size: 15px;
    letter-spacing: .1em;
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { padding-left: 18px; color: var(--lake-pale); }
  .nav-link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 2px;
    top: 50%;
    width: 7px;
    height: 7px;
    margin-top: -3.5px;
    border-radius: 50%;
    background: var(--signal);
  }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .quick-actions { gap: 8px; }
  .quick-action { padding: 7px 11px; font-size: 11px; }
}