/* ==========================================================================
   万博赛场 · 共享样式 /assets/site.css
   墨场底 · 深苔绿 · 米白纸 · 荧光青 · 琥珀橙 · 苹果绿
   ========================================================================== */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
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, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
[hidden] { display: none !important; }

/* ---------- tokens ---------- */
:root {
  --c-ink: #0A1310;
  --c-panel: #11241D;
  --c-paper: #F2EEE3;
  --c-rock: #7C9A8F;
  --c-cyan: #2FF0CE;
  --c-amber: #FFA23A;
  --c-apple: #8FE86B;
  --c-print: #050A08;
  --c-clay: #C96B4A;
  --c-mist: #9FD8CB;

  --line: #1C312A;
  --line-strong: #2A4238;

  --font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Roboto Mono", Consolas, "Liberation Mono", monospace;

  --maxw: 1280px;
  --gutter: clamp(18px, 4vw, 40px);
}

/* ---------- base ---------- */
body {
  background: var(--c-ink);
  color: var(--c-paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--c-cyan); color: #04211B; }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.section { padding-block: clamp(48px, 8vw, 104px); }

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

.display {
  font-family: var(--font-display);
  font-weight: 700;
  font-stretch: condensed;
  font-size: clamp(2.75rem, 9vw, 7.5rem);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-rock);
  line-height: 1.6;
}

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: #D8D6CB;
}
.prose p + p { margin-top: 1em; }
.prose a {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(159, 216, 203, 0.45);
  transition: color 160ms ease, border-color 160ms ease;
}
.prose a:hover { color: var(--c-cyan); border-bottom-color: var(--c-cyan); }
.prose strong { color: var(--c-paper); font-weight: 600; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.btn--accent {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: #04211B;
}
.btn--accent:hover { background: #6FF7DF; border-color: #6FF7DF; color: #04211B; }
.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--c-paper);
}
.btn--ghost:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.btn--sm { padding: 7px 13px; font-size: 12px; letter-spacing: 0.08em; }

/* ---------- tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--c-rock);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.5;
  color: var(--c-rock);
  white-space: nowrap;
}
.tag--live { border-color: var(--c-cyan); color: var(--c-cyan); }
.tag--hot { border-color: var(--c-amber); color: var(--c-amber); }
.tag--done { border-color: var(--c-clay); color: var(--c-clay); }

/* ---------- status strip ---------- */
.status-strip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  background: #0E1F19;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-mist);
}
.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-apple);
  box-shadow: 0 0 0 0 rgba(143, 232, 107, 0.5);
  animation: statusPulse 2.6s ease-out infinite;
}
@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 rgba(143, 232, 107, 0.5); }
  70% { box-shadow: 0 0 0 7px rgba(143, 232, 107, 0); }
  100% { box-shadow: 0 0 0 0 rgba(143, 232, 107, 0); }
}

/* ---------- paper block ---------- */
.paper {
  position: relative;
  background: var(--c-paper);
  color: #17221E;
  padding: clamp(24px, 4vw, 48px);
  box-shadow: 10px 10px 0 -1px #16241F, 0 0 0 1px #0E1C17;
}
.paper .eyebrow { color: #5D7268; }
.paper a { color: #1E5A4A; }

/* ---------- media ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  background-color: var(--c-panel);
  background-image:
    linear-gradient(rgba(124, 154, 143, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 154, 143, 0.1) 1px, transparent 1px);
  background-size: 28px 28px;
  border: 1px solid var(--line);
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media__img,
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media__badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  padding: 3px 8px;
  background: var(--c-amber);
  color: #241000;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.5;
}
.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px;
  background: linear-gradient(180deg, rgba(5, 10, 8, 0) 0%, rgba(5, 10, 8, 0.88) 100%);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- breadcrumbs ---------- */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-rock);
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumbs__link { color: var(--c-mist); text-decoration: none; }
.breadcrumbs__link:hover { color: var(--c-cyan); }
.breadcrumbs__sep { color: #3E5C51; }
.breadcrumbs__current { color: var(--c-paper); }

/* ---------- filter ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.filter-btn {
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: transparent;
  color: var(--c-rock);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  cursor: pointer;
  transition: color 140ms ease, border-color 140ms ease, background-color 140ms ease;
}
.filter-btn:hover { border-color: var(--c-rock); color: var(--c-paper); }
.filter-btn[aria-pressed="true"] {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: #04211B;
}

/* ---------- reveal ---------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
}
.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 440ms ease, transform 440ms ease;
}

/* ==========================================================================
   skip link
   ========================================================================== */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -130%);
  padding: 10px 18px;
  background: var(--c-cyan);
  color: #04211B;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-decoration: none;
  border-radius: 0 0 2px 2px;
  transition: transform 180ms ease;
}
.skip-link:focus {
  transform: translate(-50%, 0);
  outline: none;
}

/* ==========================================================================
   header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--c-ink);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(124, 154, 143, 0.07) 0 1px,
    transparent 1px 72px
  );
  border-bottom: 1px solid var(--line);
  transition: box-shadow 200ms ease;
}
.site-header.is-condensed {
  box-shadow: 0 14px 34px -22px #000000;
}

.site-header__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-areas:
    ". masthead tools"
    "nav nav nav";
  align-items: start;
  gap: 16px 24px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 30px var(--gutter) 18px;
  transition: padding 220ms ease, gap 220ms ease;
}

/* masthead */
.masthead {
  grid-area: masthead;
  display: grid;
  gap: 6px;
  justify-items: center;
  text-align: center;
  min-width: 0;
}
.masthead__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-stretch: condensed;
  font-size: clamp(2.5rem, 5.4vw, 4.5rem);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms ease, font-size 220ms ease, letter-spacing 220ms ease;
}
.masthead__brand:hover { color: var(--c-cyan); }
.masthead__tagline {
  max-height: 24px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--c-rock);
  text-transform: uppercase;
  white-space: nowrap;
  transition: max-height 220ms ease, opacity 180ms ease;
}

/* nav */
.site-nav {
  grid-area: nav;
  justify-self: center;
  min-width: 0;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3.4vw, 46px);
}
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 4px 0;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--c-rock);
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms ease;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 50%;
  right: 50%;
  bottom: -2px;
  height: 1px;
  background: var(--c-cyan);
  transition: left 180ms ease, right 180ms ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--c-paper); }
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { left: 0; right: 0; }
.site-nav__link[aria-current="page"] { color: var(--c-cyan); }
.site-nav__link[aria-current="page"]::after { left: 0; right: 0; }

/* tools */
.site-header__tools {
  grid-area: tools;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.save-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: transparent;
  color: var(--c-rock);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.5;
  cursor: pointer;
  white-space: nowrap;
  transition: color 160ms ease, border-color 160ms ease;
}
.save-btn:hover { color: var(--c-paper); border-color: var(--c-rock); }
.save-btn__dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #2A4238;
  transition: background-color 200ms ease, box-shadow 200ms ease;
}
.save-btn__text { display: inline-block; }
.save-btn[aria-pressed="true"] {
  color: var(--c-apple);
  border-color: rgba(143, 232, 107, 0.55);
}
.save-btn[aria-pressed="true"] .save-btn__dot {
  background: var(--c-apple);
  box-shadow: 0 0 0 3px rgba(143, 232, 107, 0.16);
  animation: applePulse 600ms ease-out 1;
}
@keyframes applePulse {
  0% { box-shadow: 0 0 0 0 rgba(143, 232, 107, 0.55); }
  100% { box-shadow: 0 0 0 6px rgba(143, 232, 107, 0); }
}

/* nav toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: transparent;
  color: var(--c-paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.5;
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease;
}
.nav-toggle:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 16px;
  height: 12px;
}
.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform 200ms ease;
}
.site-header[data-open="true"] .nav-toggle__bar:first-child {
  transform: translateY(3.25px) rotate(45deg);
}
.site-header[data-open="true"] .nav-toggle__bar:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}
.nav-toggle__label { display: inline-block; }

/* condensed */
.site-header.is-condensed .site-header__inner {
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "masthead nav tools";
  align-items: center;
  gap: 12px 24px;
  padding-top: 9px;
  padding-bottom: 9px;
}
.site-header.is-condensed .masthead {
  justify-items: start;
  text-align: left;
}
.site-header.is-condensed .masthead__brand {
  font-size: 1.4rem;
  letter-spacing: 0.02em;
}
.site-header.is-condensed .masthead__tagline {
  max-height: 0;
  opacity: 0;
}

/* progress */
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-cyan) 0%, var(--c-amber) 100%);
  pointer-events: none;
}

/* ==========================================================================
   footer
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background-color: var(--c-print);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(124, 154, 143, 0.06) 0 1px,
    transparent 1px 72px
  );
  border-top: 1px solid var(--line);
  color: var(--c-rock);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  opacity: 0.7;
  background: linear-gradient(90deg, var(--c-cyan) 0%, rgba(47, 240, 206, 0) 58%, var(--c-amber) 100%);
}
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) var(--gutter) clamp(24px, 3vw, 36px);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.6fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.footer-brand { display: grid; gap: 14px; }
.footer-brand__mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-stretch: condensed;
  font-size: clamp(2.5rem, 7vw, 5rem);
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: #1E3A31;
}
@supports (-webkit-text-stroke: 1px #000) {
  .footer-brand__mark {
    color: transparent;
    -webkit-text-stroke: 1px #3E5C51;
  }
}
.footer-brand__closing {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-rock);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 4vw, 40px);
}
.footer-col { min-width: 0; }
.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--c-mist);
}
.footer-col__list { display: grid; gap: 10px; }
.footer-link {
  position: relative;
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--c-rock);
  text-decoration: none;
  transition: color 160ms ease;
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--c-cyan);
  transition: width 200ms ease;
}
.footer-link:hover { color: var(--c-paper); }
.footer-link:hover::after { width: 100%; }

.footer-rule {
  height: 0;
  border: 0;
  border-top: 1px solid var(--line);
  margin: clamp(28px, 4vw, 44px) 0 clamp(18px, 3vw, 24px);
}

.footer-meta { display: grid; gap: 8px; }
.footer-meta__contact {
  font-size: 13px;
  line-height: 1.9;
  color: var(--c-rock);
  word-break: break-word;
}
.footer-meta__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.9;
  color: #5C7A6F;
}
.footer-meta__legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #4E6A60;
}

/* ==========================================================================
   responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .site-header__inner {
    grid-template-columns: 1fr auto;
    grid-template-areas: "masthead tools";
    align-items: center;
    gap: 12px;
    padding: 14px var(--gutter);
  }
  .masthead { justify-items: start; text-align: left; }
  .masthead__brand { font-size: 1.5rem; letter-spacing: 0.02em; }
  .masthead__tagline { display: none; }
  .site-header.is-condensed .site-header__inner {
    grid-template-columns: 1fr auto;
    grid-template-areas: "masthead tools";
    gap: 12px;
    padding: 8px var(--gutter);
  }
  .site-header.is-condensed .masthead__brand { font-size: 1.35rem; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    justify-self: stretch;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--c-panel);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 44px -26px #000000;
    transition: max-height 280ms ease, visibility 280ms ease;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-nav__list > li + li { border-top: 1px solid var(--line); }
  .site-nav__link {
    display: block;
    padding: 15px var(--gutter);
    font-size: 14px;
    letter-spacing: 0.12em;
    color: var(--c-paper);
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] {
    background: rgba(47, 240, 206, 0.07);
    box-shadow: inset 2px 0 0 0 var(--c-cyan);
    color: var(--c-cyan);
  }
  .site-header[data-open="true"] .site-nav {
    max-height: 520px;
    visibility: visible;
  }

  .nav-toggle { display: inline-flex; }
  .save-btn { display: none; }

  .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
  .display { font-size: clamp(2.5rem, 11vw, 4.5rem); }
}

@media (max-width: 560px) {
  .site-header__tools { gap: 8px; }
  .btn--sm { padding: 7px 10px; font-size: 11px; letter-spacing: 0.04em; }
  .nav-toggle { padding: 8px 10px; }
  .nav-toggle__label { display: none; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 16px; }
  .footer-meta__contact { font-size: 12.5px; }
  .prose { font-size: 16px; }
}

/* ==========================================================================
   reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  html { scroll-behavior: auto; }
  .js-reveal [data-reveal] { opacity: 1; transform: none; }
  .status-dot { animation: none; }
}