/* ==========================================================================
   立即博看台 / site.css
   共享外壳：reset、变量、中文排版、头部、页脚、通用组件
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B2B24;
  --ink-deep: #08211C;
  --panel: #123A31;
  --edge: #2E4A43;
  --lime: #C8FF3D;
  --lime-deep: #9FD62B;
  --paper: #F4F1E8;
  --char: #1C1F1D;
  --cool: #8A9490;
  --amber: #D9A441;
  --sheet: #FBFAF4;

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

  --wrap: 1240px;
  --gut: clamp(18px, 4vw, 40px);
  --cut: 22px;
  --header-h: 96px;
  --ease: cubic-bezier(0.22, 0.7, 0.28, 1);
}

/* ---------- 3. 中文排版与基础 ---------- */
body {
  min-height: 100vh;
  background:
    radial-gradient(120% 92% at 100% 0%, rgba(18, 58, 49, 0.85), transparent 62%),
    var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--paper);
  text-wrap: balance;
  word-break: break-word;
}

h1 { font-size: clamp(32px, 5vw, 64px); }
h2 { font-size: clamp(24px, 3.2vw, 48px); }
h3 { font-size: clamp(20px, 2.2vw, 32px); }
h4 { font-size: clamp(17px, 1.6vw, 24px); }

p { margin-bottom: 1.1em; word-break: break-word; }
p:last-child { margin-bottom: 0; }

strong { font-weight: 700; color: var(--paper); }

::selection {
  background: var(--lime);
  color: var(--char);
}

:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 1px;
}

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

/* ---------- 4. 工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gut);
}

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.4;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 26px;
  height: 1px;
  background: var(--lime);
}

.rule {
  height: 0;
  margin: clamp(28px, 4vw, 48px) 0;
  border: 0;
  border-top: 1px solid var(--edge);
}

.stat {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--lime);
  background: rgba(200, 255, 61, 0.06);
  border: 1px solid var(--edge);
}

.tag--amber {
  color: var(--amber);
  background: rgba(217, 164, 65, 0.09);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 0;
  border-radius: 0;
  background: var(--lime);
  color: var(--char);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.04em;
  cursor: pointer;
  background-image: linear-gradient(135deg, transparent 0 88%, rgba(11, 43, 36, 0.22) 88% 100%);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.btn:hover { background-color: var(--lime-deep); }
.btn:active { transform: translateY(1px); }

.btn-lime { background-color: var(--lime); color: var(--char); }
.btn-lime:hover { background-color: var(--lime-deep); }

.btn-ghost {
  background-color: transparent;
  background-image: none;
  color: var(--paper);
  box-shadow: inset 0 0 0 1px var(--edge);
}

.btn-ghost:hover {
  background-color: var(--lime);
  color: var(--char);
  box-shadow: inset 0 0 0 1px var(--lime);
}

/* 网格 */
.grid { display: grid; gap: clamp(18px, 2.6vw, 32px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-asym { grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); }

/* 切角面板：堆叠画板的基本单元 */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 40px);
  background: var(--panel);
  border: 1px solid var(--edge);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
}

.panel--plain { clip-path: none; }

/* 图片容器基础规则 */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--ink-deep);
  border: 1px solid var(--edge);
}

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

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

.media-frame__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--cool);
}

/* 正文容器 */
.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(244, 241, 232, 0.86);
}

.prose h2 { margin: 1.8em 0 0.6em; font-size: clamp(22px, 2.4vw, 30px); }
.prose h3 { margin: 1.6em 0 0.5em; font-size: clamp(18px, 1.9vw, 22px); }
.prose h2:first-child,
.prose h3:first-child { margin-top: 0; }
.prose ul,
.prose ol { margin: 0 0 1.2em; padding-left: 1.3em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.4em; }
.prose a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.prose a:hover { color: var(--lime-deep); }
.prose strong { color: var(--paper); }
.prose blockquote {
  margin: 1.6em 0;
  padding-left: 18px;
  border-left: 2px solid var(--lime);
  color: rgba(244, 241, 232, 0.75);
}

/* 暖白阅读区 */
.on-sheet { background: var(--sheet); color: var(--char); }
.on-sheet h2,
.on-sheet h3,
.on-sheet h4 { color: var(--char); }
.on-sheet .prose { color: rgba(28, 31, 29, 0.88); }
.on-sheet .prose strong { color: var(--char); }
.on-sheet .prose a { color: #557A0F; }

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0 0 28px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.8;
  letter-spacing: 0.06em;
  color: var(--cool);
}

.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--edge);
}
.breadcrumb a { color: var(--cool); }
.breadcrumb a:hover { color: var(--lime); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

/* 滚动显现协议 */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal][data-in="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--char);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: none;
  outline: 2px solid var(--paper);
  outline-offset: 2px;
}

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(11, 43, 36, 0.78), rgba(11, 43, 36, 0));
  color: var(--paper);
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header[data-scrolled="true"] {
  background: linear-gradient(180deg, #0B2B24 0%, #10352C 100%);
  box-shadow: 0 1px 0 rgba(46, 74, 67, 0.95),
    0 22px 44px -30px rgba(0, 0, 0, 0.92);
}

.header-rail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 12px var(--gut) 0;
  transition: padding 0.3s var(--ease);
}

.rail-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.14em;
  color: var(--cool);
}

.rail-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 0 rgba(200, 255, 61, 0.55);
  animation: railPulse 2.4s var(--ease) infinite;
}

.rail-sep { color: var(--edge); }

.rail-note {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--cool);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 12px var(--gut) 16px;
  transition: padding 0.3s var(--ease);
}

.site-header[data-scrolled="true"] .header-rail { padding-top: 8px; }
.site-header[data-scrolled="true"] .header-bar { padding-block: 8px 12px; }

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0;
}

.brand-mark {
  position: relative;
  display: block;
  width: 30px;
  height: 30px;
  flex: none;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 64% 100%, 0 100%);
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: 7px;
  bottom: 7px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  transform: rotate(45deg);
}

.brand-text { display: block; }

.brand-name {
  display: block;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.brand-line {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--cool);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--edge);
  border-radius: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
}

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

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 20px;
  height: 10px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--lime);
  transition: transform 0.25s var(--ease), top 0.25s var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { top: 8px; }

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

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

.nav-toggle-label { display: inline-block; }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 34px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
}

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.6;
  color: rgba(244, 241, 232, 0.82);
  transition: color 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--lime);
  transition: right 0.25s var(--ease);
}

.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { right: 0; }

.nav-link[aria-current="page"] { color: var(--lime); }
.nav-link[aria-current="page"]::after { right: 0; background: var(--lime); }

.nav-cta { white-space: nowrap; }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(46, 74, 67, 0.5);
  overflow: hidden;
  pointer-events: none;
}

.progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--lime);
  transition: width 0.1s linear;
}

@keyframes railPulse {
  0% { box-shadow: 0 0 0 0 rgba(200, 255, 61, 0.5); }
  70% { box-shadow: 0 0 0 7px rgba(200, 255, 61, 0); }
  100% { box-shadow: 0 0 0 0 rgba(200, 255, 61, 0); }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 9vw, 120px);
  padding: 0;
  background: linear-gradient(180deg, #08211C 0%, #0B2B24 46%, #123A31 100%);
  border-top: 1px solid var(--edge);
  color: var(--paper);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    118deg,
    rgba(200, 255, 61, 0.055) 0 1px,
    transparent 1px 140px
  );
}

.footer-inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 76px) var(--gut) 0;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(240px, 1.5fr) repeat(3, minmax(150px, 1fr));
  gap: clamp(24px, 4vw, 52px);
}

.footer-brand { display: block; }

.brand-footer .brand-name { font-size: 19px; }
.brand-footer .brand-line { letter-spacing: 0.06em; text-transform: none; }

.footer-lede {
  max-width: 34ch;
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(244, 241, 232, 0.78);
}

.footer-cta { margin-top: 24px; }

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

.footer-col-title {
  position: relative;
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cool);
}

.footer-col-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 34px;
  height: 1px;
  background: var(--lime);
}

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

.footer-link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 232, 0.78);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer-link:hover {
  color: var(--lime);
  transform: translateX(3px);
}

.contact-list { display: grid; gap: 14px; }

.contact-item { display: grid; gap: 2px; }

.contact-key {
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cool);
}

.contact-value {
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(244, 241, 232, 0.88);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 32px;
  margin-top: clamp(32px, 5vw, 58px);
  padding: 20px 0 30px;
  border-top: 1px solid var(--edge);
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: rgba(244, 241, 232, 0.72);
}

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

.footer-note {
  max-width: 52ch;
  margin: 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--cool);
}

/* ---------- 8. 响应式 ---------- */

/* 平板：收起导航为抽屉 */
@media (max-width: 1060px) {
  .nav-list { gap: 12px; }
  .nav-link { font-size: 13.5px; }
}

@media (max-width: 900px) {
  :root { --header-h: 88px; }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    padding: 14px var(--gut) 26px;
    background: linear-gradient(180deg, #0B2B24 0%, #0E312A 100%);
    border-top: 1px solid var(--edge);
    border-bottom: 1px solid var(--edge);
    box-shadow: 0 26px 50px -28px rgba(0, 0, 0, 0.95);
    clip-path: polygon(
      0 0,
      100% 0,
      100% calc(100% - 18px),
      calc(100% - 18px) 100%,
      0 100%
    );
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease),
      visibility 0.25s var(--ease);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item { display: block; }

  .nav-link {
    display: block;
    padding: 14px 2px;
    font-size: 16px;
    border-bottom: 1px solid rgba(46, 74, 67, 0.65);
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    padding-left: 12px;
    border-left: 3px solid var(--lime);
  }

  .nav-cta {
    width: 100%;
    margin-top: 18px;
    padding-block: 14px;
  }

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

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

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

@media (max-width: 720px) {
  body { font-size: 15.5px; }

  .rail-note { display: none; }

  .brand-line { font-size: 10px; letter-spacing: 0.06em; }

  .media-frame { aspect-ratio: 4 / 3; }
  .media-frame--wide { aspect-ratio: 16 / 9; }

  .breadcrumb { font-size: 11px; }
}

@media (max-width: 560px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .brand-line { display: none; }
  .footer-cta { width: 100%; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .btn { padding: 11px 18px; font-size: 13.5px; }
}

/* ---------- 9. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .rail-dot { animation: none; }

  .progress-bar { transition: none; }
}