/* ==========================================================================
   宇博官网 · 共享样式 /assets/site.css
   12 栏网格 · 晨雾灰 + 矿物蓝 + 暖橙 + 铜金
   ========================================================================== */

:root {
  --fog-050: #F5F7F8;
  --fog-100: #E8EDEF;
  --stone-300: #B7C1C7;
  --ink-900: #121D26;
  --ink-600: #4B5B66;
  --mineral-700: #123F55;
  --mineral-500: #2A7C9E;
  --mineral-200: #BFD9E4;
  --warm-500: #E8763A;
  --warm-700: #A8441A;
  --copper-600: #A87B3C;
  --copper-100: #F1E6D6;

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

  --gap: clamp(14px, 1.8vw, 26px);
  --radius-card: clamp(20px, 2.2vw, 28px);
  --radius-pill: 999px;
  --shadow-soft: 0 20px 48px -30px rgba(18, 63, 85, .55);
  --line: 1px solid var(--stone-300);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--fog-050);
  color: var(--ink-900);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.2;
  margin: 0 0 .6em;
  color: var(--ink-900);
  text-wrap: balance;
}

h3, h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: -.005em;
  line-height: 1.35;
  margin: 0 0 .5em;
  color: var(--ink-900);
}

h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.55rem, 2.8vw, 2.35rem); }
h3 { font-size: clamp(1.12rem, 1.5vw, 1.35rem); }
h4 { font-size: 1rem; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--mineral-700); text-decoration: none; }
a:hover { color: var(--mineral-500); }

ul, ol { margin: 0 0 1em; padding-left: 1.2em; }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

:focus-visible {
  outline: 2px solid var(--warm-500);
  outline-offset: 3px;
  border-radius: 6px;
}
.site-footer :focus-visible { outline-color: var(--copper-100); }

#main-content { display: block; scroll-margin-top: 120px; }

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

/* ---------- 容器与网格 ---------- */

.shell {
  width: min(1280px, 100% - 2.6rem);
  margin-inline: auto;
}

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

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* ---------- 通用区块与排版 ---------- */

.section { padding: clamp(40px, 6vw, 88px) 0; }

.section-head { max-width: 62ch; margin-bottom: clamp(20px, 3vw, 36px); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--warm-700);
  margin: 0 0 12px;
}

.lead {
  font-size: clamp(16px, 1.5vw, 18.5px);
  line-height: 1.8;
  color: var(--ink-600);
  max-width: 60ch;
  margin: 0 0 1em;
}

.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-900);
}
.prose h2 { margin-top: 1.7em; }
.prose h3 { margin-top: 1.5em; }
.prose ul, .prose ol { color: var(--ink-900); }

.card {
  background: #fff;
  border: var(--line);
  border-radius: var(--radius-card);
  padding: clamp(20px, 2.4vw, 30px);
  box-shadow: var(--shadow-soft);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 13px;
  border-radius: var(--radius-pill);
  background: var(--copper-100);
  color: var(--warm-700);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  line-height: 1.5;
}

/* ---------- 面包屑 ---------- */

.breadcrumb { font-size: 13px; color: var(--ink-600); }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumb-list li { display: flex; align-items: center; }
.breadcrumb-list li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--stone-300);
}
.breadcrumb-link { color: var(--ink-600); }
.breadcrumb-link:hover { color: var(--mineral-700); text-decoration: underline; }

/* ---------- 图片容器基础规则 ---------- */

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card);
  border: var(--line);
  background-image: linear-gradient(155deg, var(--fog-100) 0%, var(--mineral-200) 55%, var(--fog-050) 100%);
  aspect-ratio: 16 / 10;
}
.media-frame > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--cut {
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
  border-radius: 4px;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.2;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn-solid {
  background-color: var(--warm-500);
  border-color: var(--warm-500);
  color: var(--ink-900);
}
.btn-solid:hover {
  background-color: var(--warm-700);
  border-color: var(--warm-700);
  color: #fff;
  transform: translateY(-1px);
}
.btn-ghost {
  background-color: transparent;
  border-color: var(--stone-300);
  color: var(--ink-900);
}
.btn-ghost:hover {
  background-color: var(--mineral-200);
  border-color: var(--mineral-500);
  color: var(--mineral-700);
}
.btn-block { width: 100%; }

/* ---------- 跳转链接 ---------- */

.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--ink-900);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: top .18s ease;
}
.skip-link:focus { top: 12px; color: #fff; }

/* ==========================================================================
   头部
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: rgba(245, 247, 248, .94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--line);
}

.header-rail {
  position: relative;
  background-color: var(--mineral-700);
  color: var(--fog-100);
}

.rail-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 18px;
  min-height: 38px;
  padding: 5px 0;
  font-size: 12px;
  letter-spacing: .06em;
}

.rail-item { margin: 0; }

.rail-region {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #DCE6EA;
}

.rail-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--warm-500);
}

.rail-version { color: var(--mineral-200); }

.rail-jump {
  margin-left: auto;
  padding: 3px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(191, 217, 228, .38);
  background: transparent;
  color: #DCE6EA;
  font-family: var(--font-sans);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease;
}
.rail-jump:hover {
  background-color: rgba(191, 217, 228, .16);
  border-color: var(--warm-500);
  color: #fff;
}

.rail-link {
  color: #DCE6EA;
  font-size: 12px;
  letter-spacing: .06em;
  padding-bottom: 1px;
  border-bottom: 1px solid rgba(191, 217, 228, .35);
}
.rail-link:hover {
  color: #fff;
  border-color: var(--warm-500);
}

.rail-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--mineral-200), var(--warm-500));
  will-change: transform;
}

.header-main { background-color: transparent; }

.header-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  align-items: center;
  column-gap: var(--gap);
  row-gap: 10px;
  padding: 13px 0 15px;
}

.brand {
  grid-column: 1 / span 3;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-900);
  text-decoration: none;
}
.brand:hover { color: var(--ink-900); }

.brand-mark {
  position: relative;
  font-family: var(--font-serif);
  font-size: clamp(22px, 2vw, 27px);
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1;
  padding-bottom: 8px;
}
.brand-mark::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 3px;
  border-radius: 2px;
  background-color: var(--warm-500);
}

.brand-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-line {
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink-600);
  letter-spacing: .02em;
}

.brand-domain {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  color: var(--copper-600);
  letter-spacing: .01em;
}

.header-bridge {
  grid-column: 4 / span 2;
  display: flex;
  align-items: center;
  gap: 10px;
}

.bridge-line {
  flex: 1 1 auto;
  max-width: 96px;
  height: 1px;
  background-image: linear-gradient(90deg, var(--copper-600), rgba(168, 123, 60, 0));
}

.bridge-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--copper-600);
  white-space: nowrap;
}

.primary-nav { grid-column: 6 / span 5; }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--ink-600);
  text-decoration: none;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}
.nav-link:hover {
  background-color: var(--fog-100);
  border-color: var(--stone-300);
  color: var(--ink-900);
}
.nav-link[aria-current="page"] {
  background-color: var(--mineral-700);
  border-color: var(--mineral-700);
  color: #fff;
}
.nav-link[aria-current="page"]:hover {
  background-color: var(--mineral-700);
  color: #fff;
}

.header-actions {
  grid-column: 11 / span 2;
  justify-self: end;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: var(--line);
  background-color: #fff;
  color: var(--ink-900);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--ink-900);
  transition: background-color .2s ease;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: var(--ink-900);
  transition: transform .2s ease, background-color .2s ease;
}
.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 移动抽屉 ---------- */

.nav-drawer { display: none; }

.nav-drawer[data-open] {
  display: block;
  background-color: var(--fog-050);
  border-top: var(--line);
  animation: drawer-in .22s ease-out both;
}

@keyframes drawer-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.drawer-inner { padding: 18px 0 26px; }

.drawer-title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--warm-700);
  margin: 0 0 12px;
}

.drawer-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.drawer-link {
  display: block;
  padding: 12px 16px;
  border-radius: var(--radius-pill);
  border: var(--line);
  background-color: #fff;
  color: var(--ink-900);
  font-size: 14.5px;
  font-weight: 500;
  text-decoration: none;
}
.drawer-link[aria-current="page"] {
  background-color: var(--mineral-700);
  border-color: var(--mineral-700);
  color: #fff;
}

.drawer-actions {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.drawer-meta {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--ink-600);
}

/* ---------- 移动底部胶囊导航 ---------- */

.mobile-dock { display: none; }

.dock-list {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.dock-link {
  display: inline-block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: var(--line);
  background-color: #fff;
  color: var(--ink-600);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
}
.dock-link[aria-current="page"] {
  background-color: var(--mineral-700);
  border-color: var(--mineral-700);
  color: #fff;
}

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
  margin-top: clamp(48px, 7vw, 96px);
  background-color: var(--mineral-700);
  color: #DCE6EA;
  font-size: 14px;
}

.footer-path { border-bottom: 1px solid rgba(191, 217, 228, .22); }

.path-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding: 15px 0;
}

.path-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--copper-100);
}

.path-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.path-list li {
  display: flex;
  align-items: center;
  font-size: 13.5px;
}
.path-list li + li::before {
  content: "→";
  margin: 0 12px;
  font-family: var(--font-mono);
  color: var(--copper-600);
}

.path-link {
  color: #DCE6EA;
  padding-bottom: 1px;
  border-bottom: 1px solid rgba(191, 217, 228, .3);
}
.path-link:hover { color: #fff; border-color: var(--warm-500); }

.footer-main {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 40px) var(--gap);
  padding: clamp(34px, 4.5vw, 58px) 0 clamp(28px, 3.6vw, 44px);
}

.footer-brand {
  grid-column: 1 / span 4;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-mark {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: .04em;
  color: #fff;
}

.footer-domain {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--mineral-200);
}

.footer-note {
  margin: 6px 0 0;
  max-width: 26ch;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(220, 230, 234, .78);
}

.footer-cols {
  grid-column: 5 / span 8;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.col-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--copper-100);
}

.col-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.col-link {
  width: fit-content;
  font-size: 14px;
  color: #DCE6EA;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.col-link:hover { color: #fff; border-color: var(--warm-500); }

.footer-base {
  background-color: rgba(9, 32, 44, .5);
  border-top: 1px solid rgba(191, 217, 228, .22);
  padding: 20px 0 34px;
}

.base-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  font-size: 12.5px;
  line-height: 1.7;
}

.base-version {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--copper-100);
}
.base-contact,
.base-address { margin: 0; color: var(--mineral-200); }
.base-legal { margin: 0; color: rgba(220, 230, 234, .72); }
.base-signature { margin: 0; color: rgba(220, 230, 234, .6); }

/* ==========================================================================
   滚动显现协议
   ========================================================================== */

.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
}
.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .24s ease-out, transform .24s ease-out;
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width: 1180px) {
  .header-bridge { display: none; }
  .primary-nav { grid-column: 4 / span 6; }
  .header-actions { grid-column: 10 / span 3; }
  .nav-link { padding: 9px 10px; font-size: 13px; }
}

@media (max-width: 980px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 6; }
  .footer-brand { grid-column: 1 / span 6; }
  .footer-cols { grid-column: 1 / span 6; }
}

@media (max-width: 880px) {
  .header-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 12px 0 14px;
  }
  .brand { grid-column: 1 / span 1; }
  .header-bridge,
  .primary-nav,
  .header-actions { display: none; }
  .nav-toggle { display: inline-flex; grid-column: 2 / span 1; justify-self: end; }
  .nav-drawer { display: none; }
  .rail-version { display: none; }
  .rail-jump { margin-left: auto; }

  .mobile-dock {
    display: block;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    padding: 9px 12px calc(9px + env(safe-area-inset-bottom));
    background-color: rgba(245, 247, 248, .96);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: var(--line);
  }
  .dock-list {
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }
  .dock-list::-webkit-scrollbar { display: none; }

  body { padding-bottom: 88px; }

  .footer-main { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / span 6; }
  .footer-cols { grid-column: 1 / span 6; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-cols .footer-col:last-child { grid-column: 1 / span 2; }
}

@media (min-width: 881px) {
  .nav-drawer { display: none !important; }
  .base-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 40px; }
}

@media (max-width: 640px) {
  .shell { width: min(1280px, 100% - 1.8rem); }
  .brand-line { display: none; }
  .drawer-list { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-cols .footer-col:last-child { grid-column: 1 / span 1; }
  .path-inner { gap: 8px 12px; }
  .path-list li + li::before { margin: 0 8px; }
  .section { padding: 34px 0; }
}

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