/* =========================================================
   猛犸体育场 · 冰川观测站 — 共享层
   /assets/site.css
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 136px;
}

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

a { color: inherit; }

table { border-collapse: collapse; width: 100%; }

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

::selection {
  background: var(--lava);
  color: #fff;
}

/* ---------- tokens ---------- */
:root {
  --ice-deep: #0B2239;
  --glacier: #1B4F7E;
  --bone: #F4F1EA;
  --cream: #E6DCCB;
  --ink: #17120F;
  --lava: #E2542B;
  --aurora: #2FC6A0;
  --mist: #9FB0C0;
  --ivory: #D8C59B;
  --ink-soft: #4A4038;

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

  --wrap: 1180px;
  --wrap-wide: 1440px;
  --gutter: clamp(16px, 4vw, 40px);

  --rule: 2px solid var(--ink);
  --shadow-hard: 6px 6px 0 var(--ink);
  --shadow-frame: 6px 6px 0 rgba(11, 34, 57, 0.22);

  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- base typography ---------- */
body {
  background: var(--bone);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.02em;
}

strong { font-weight: 700; }

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

.wrap--wide { max-width: var(--wrap-wide); }

.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;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lava);
  color: #fff;
  border: 2px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform .18s var(--ease);
}

.skip-link:focus { transform: none; }

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--bone);
}

/* --- 数据条 --- */
.cmd-strip {
  background: var(--ice-deep);
  color: var(--bone);
  border-bottom: 2px solid var(--ink);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.cmd-strip.is-dropready { box-shadow: inset 0 0 0 3px var(--aurora); }

.cmd-strip.is-dropped {
  background: var(--glacier);
  box-shadow: inset 0 0 0 3px var(--aurora);
}

.cmd-strip__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.4vw, 32px);
  min-height: 40px;
  padding-block: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.cmd-strip__brand {
  flex: 0 0 auto;
  color: var(--ivory);
  white-space: nowrap;
}

.cmd-strip__brand::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  background: var(--lava);
  transform: translateY(-1px);
}

.cmd-strip__data {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.2vw, 28px);
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}

.cmd-strip__data::-webkit-scrollbar { display: none; }

.cmd-cell {
  display: flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
}

.cmd-cell__key {
  color: var(--mist);
  font-size: 11px;
  letter-spacing: .12em;
}

.cmd-cell__val {
  color: var(--bone);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.cmd-cell__val--aurora { color: var(--aurora); }

.cmd-cell--countdown .cmd-cell__val {
  color: var(--lava);
  letter-spacing: .14em;
}

.cmd-strip__help {
  flex: 0 0 auto;
  color: var(--mist);
  font-size: 12px;
  text-decoration: underline;
  text-decoration-color: rgba(159, 176, 192, .55);
  text-underline-offset: 3px;
  transition: color .16s var(--ease);
}

.cmd-strip__help:hover { color: var(--aurora); }

/* --- 命令栏 --- */
.cmd-bar {
  position: relative;
  background: var(--bone);
}

.cmd-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--ink);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  background: var(--ink);
  color: var(--bone);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--lava);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -.01em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--glacier);
}

/* --- 导航 --- */
.nav { margin-left: auto; }

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

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding: 10px 12px;
  font-size: 14.5px;
  color: var(--glacier);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 3px;
  background: var(--lava);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s var(--ease), background .18s var(--ease);
}

.nav__link:hover { color: var(--ink); }

.nav__link:hover::after {
  background: var(--mist);
  transform: scaleX(1);
}

.nav__link[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

.nav__link[aria-current="page"]::after {
  background: var(--lava);
  transform: scaleX(1);
}

.nav__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--mist);
  font-weight: 400;
}

.nav__link[aria-current="page"] .nav__idx { color: var(--lava); }

.cmd-bar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* --- 骨片订阅标签 --- */
.bone-tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  background: var(--bone);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--lava);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  text-decoration: none;
  cursor: grab;
  touch-action: manipulation;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), background .16s var(--ease);
}

.bone-tag::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--lava);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 50% 100%, 0 70%);
}

.bone-tag:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--lava);
}

.bone-tag[data-dragging="true"] {
  cursor: grabbing;
  box-shadow: none;
  transform: translate(3px, 3px);
  background: var(--cream);
}

.bone-tag.is-confirmed {
  background: var(--aurora);
  box-shadow: 4px 4px 0 var(--ink);
}

.bone-tag.is-confirmed::before { background: var(--ink); }

.is-dragging { user-select: none; }

/* --- 菜单按钮 --- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: var(--bone);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background .16s var(--ease), color .16s var(--ease);
}

.nav-toggle[aria-expanded="true"] {
  background: var(--lava);
  color: var(--bone);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before {
  top: 0;
  box-shadow: 0 5px 0 currentColor;
}

.nav-toggle__bars::after { bottom: 0; }

/* --- 阅读进度轨 --- */
.progress-rail {
  position: relative;
  height: 5px;
  background: var(--glacier);
  overflow: hidden;
}

.progress-rail__fill {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 0;
  background: var(--lava);
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  background: var(--ice-deep);
  color: var(--bone);
  border-top: 3px solid var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: clamp(24px, 3.4vw, 56px);
  padding-block: clamp(40px, 6vw, 76px);
}

.footer-help {
  background: var(--cream);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 8px 8px 0 rgba(226, 84, 43, .38);
  padding: clamp(20px, 2.4vw, 28px);
}

.footer-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lava);
}

.footer-help__title {
  margin-top: 8px;
  font-size: clamp(24px, 2.6vw, 32px);
}

.footer-help__lede {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.fit-list {
  margin-top: 16px;
  border-top: 2px solid var(--ink);
}

.fit-list__item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid rgba(23, 18, 15, .18);
  font-size: 13.5px;
}

.fit-list__key { color: var(--ink-soft); }

.fit-list__val {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

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

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ivory);
}

.footer-col__title::before {
  content: "";
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  background: var(--lava);
}

.footer-links {
  margin-top: 14px;
  display: grid;
  gap: 2px;
}

.footer-links a {
  display: block;
  padding: 7px 0;
  font-size: 14.5px;
  color: var(--bone);
  text-decoration: none;
  border-bottom: 1px solid rgba(159, 176, 192, .16);
  transition: color .16s var(--ease), padding-left .16s var(--ease);
}

.footer-links a:hover {
  color: var(--aurora);
  padding-left: 6px;
}

.footer-contact {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.95;
  color: var(--bone);
  overflow-wrap: anywhere;
}

.footer-base {
  display: grid;
  gap: 10px;
  padding-block: 22px 32px;
  border-top: 1px solid rgba(159, 176, 192, .28);
}

.footer-base__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.footer-brand { color: var(--bone); }

.footer-year { color: var(--ivory); }

.footer-icp { color: var(--mist); }

.footer-note {
  font-size: 13px;
  color: var(--mist);
}

/* =========================================================
   共享基础组件（页面阶段复用）
   ========================================================= */
.section { padding-block: clamp(48px, 7vw, 104px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }
.section--cream { background: var(--cream); }
.section--dark { background: var(--ice-deep); color: var(--bone); }

.band {
  background: var(--ice-deep);
  color: var(--bone);
  border-block: 2px solid var(--ink);
  padding-block: clamp(24px, 3.4vw, 44px);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--lava);
}

.section-number {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--ivory);
}

.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(56px, 12vw, 148px);
  line-height: .92;
  letter-spacing: -.035em;
}

.h-section {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.06;
  letter-spacing: -.02em;
}

.lede {
  max-width: 62ch;
  font-size: clamp(18px, 1.55vw, 21px);
  line-height: 1.7;
  color: var(--ink-soft);
}

.section--dark .lede,
.band .lede { color: var(--mist); }

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
}

.prose h2 {
  margin-top: 40px;
  font-size: clamp(22px, 2.4vw, 30px);
}

.prose h3 {
  margin-top: 28px;
  font-size: 19px;
}

.prose p + p { margin-top: 16px; }

.prose ul {
  margin-top: 14px;
  padding-left: 1.25em;
  list-style: square;
  display: grid;
  gap: 8px;
}

.prose a {
  color: var(--glacier);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(226, 84, 43, .7);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 30px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  background: var(--bone);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2vw, 26px);
}

.card--cream { background: var(--cream); }

.card--dark {
  background: var(--ice-deep);
  color: var(--bone);
  box-shadow: 6px 6px 0 var(--glacier);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 2px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  line-height: 1.6;
  color: var(--glacier);
}

.tag--lava { color: var(--lava); }
.tag--aurora { color: var(--aurora); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  background: var(--bone);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  text-decoration: none;
  cursor: pointer;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), background .16s var(--ease), color .16s var(--ease);
}

.btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.btn--lava {
  background: var(--lava);
  color: #fff;
}

.btn--dark {
  background: var(--ice-deep);
  color: var(--bone);
  box-shadow: 5px 5px 0 var(--glacier);
}

.btn--dark:hover { box-shadow: 2px 2px 0 var(--glacier); }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

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

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--glacier);
}

.breadcrumb a {
  text-decoration: none;
  border-bottom: 1px solid rgba(159, 176, 192, .55);
}

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

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

.section--dark .breadcrumb { color: var(--mist); }
.section--dark .breadcrumb [aria-current="page"] { color: var(--bone); }

.index-wall {
  display: grid;
  background: var(--bone);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.index-wall a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(23, 18, 15, .18);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  text-decoration: none;
  transition: background .16s var(--ease), color .16s var(--ease);
}

.index-wall a:last-child { border-bottom: 0; }

.index-wall a:hover { background: var(--cream); }

.index-wall a[aria-current="true"] {
  background: var(--ice-deep);
  color: var(--bone);
}

/* --- 图形容器（页面阶段放图/内联 SVG） --- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--glacier);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-frame);
}

.media-frame img,
.media-frame video,
.media-frame svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--hatch {
  background-image: repeating-linear-gradient(135deg, rgba(244, 241, 234, .16) 0 10px, transparent 10px 20px);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  background: rgba(11, 34, 57, .88);
  color: var(--bone);
  border-top: 2px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}

/* --- 显现 --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .26s var(--ease), transform .26s var(--ease);
}

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

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .nav__link { padding: 10px 9px; font-size: 13.5px; }
  .nav__link::after { left: 9px; right: 9px; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 120px; }

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

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 5;
    margin-left: 0;
    background: var(--ice-deep);
    border-top: 2px solid var(--ink);
    border-bottom: 2px solid var(--ink);
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s linear;
  }

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

  .nav__list {
    display: block;
    padding: 6px 0;
  }

  .nav__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px var(--gutter);
    font-size: 16px;
    color: var(--bone);
    border-bottom: 1px solid rgba(159, 176, 192, .2);
  }

  .nav__link::after { display: none; }

  .nav__link[aria-current="page"] {
    background: rgba(226, 84, 43, .16);
    color: var(--bone);
  }

  .nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 4px;
    background: var(--lava);
  }

  .nav__idx { color: var(--mist); }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }

  .footer-help { grid-column: 1 / -1; }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .cmd-strip__help { display: none; }
  .cmd-strip__brand { display: none; }
  .cmd-strip__data { margin-left: 0; width: 100%; }

  .brand__sub { display: none; }

  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .brand__name { font-size: 16px; }
  .brand__mark { width: 32px; height: 32px; }
  .bone-tag { padding: 8px 11px; font-size: 12px; }
  .nav-toggle { padding: 9px 10px; }
  .nav-toggle__text { display: none; }
  .fit-list__item { flex-wrap: wrap; gap: 2px 12px; }
  .footer-base__row { font-size: 11.5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}