/* =========================================================
   9397 威利斯 · 共享样式表 /assets/site.css
   设计语汇：深海墨蓝底 · 信号橙点状强调 · 蓝图细线网格
   ========================================================= */

:root {
  /* 色板 */
  --ink-900: #041016;
  --ink-800: #071a24;
  --ink-700: #0e2a35;
  --signal: #ff7a3d;
  --signal-soft: #ff9a6b;
  --amber: #d9a15b;
  --silver: #a9b8be;
  --mist: #edf3f4;
  --blue: #6ea6b8;
  --teal: #64c7b8;
  --paper: #c3ced1;

  /* 语义 */
  --bg: var(--ink-800);
  --panel: var(--ink-700);
  --text: var(--mist);
  --text-dim: var(--silver);
  --line: rgba(169, 184, 190, 0.22);
  --line-strong: rgba(169, 184, 190, 0.42);
  --grid-line: rgba(110, 166, 184, 0.07);
  --focus: var(--signal);

  /* 字体 */
  --font-display: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  /* 度量 */
  --shell: 1320px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius-pill: 999px;

  /* 动效 */
  --dur-1: 180ms;
  --dur-2: 260ms;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

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

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 450;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img { height: auto; }

button { font: inherit; color: inherit; }

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

#main-content { scroll-margin-top: 96px; }

/* ---------------- 基础排版 ---------------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--mist);
}

h1 { font-size: clamp(40px, 5.2vw, 64px); line-height: 1.08; }
h2 { font-size: clamp(28px, 3vw, 40px); line-height: 1.18; font-weight: 650; }
h3 { font-size: 22px; line-height: 1.35; font-weight: 650; }
h4 { font-size: 18px; line-height: 1.4; font-weight: 650; }

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

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur-1) var(--ease);
}

a:hover { color: var(--signal); }

strong { font-weight: 650; color: var(--mist); }

code, kbd, samp, pre { font-family: var(--font-mono); font-size: 0.92em; }

hr {
  height: 0;
  margin: 0;
  border: 0;
  border-top: 1px solid var(--line);
}

::selection { background: var(--signal); color: #08151b; }

:where(a, button, [tabindex], input, select, textarea):focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(237, 243, 244, 0.22);
  border-radius: 2px;
  text-decoration: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* =========================================================
   头部 · 悬浮胶囊索引条
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 14px var(--gutter);
  background: rgba(4, 16, 22, 0.94);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  transition: padding var(--dur-2) var(--ease), background-color var(--dur-2) var(--ease);
}

.site-header[data-scrolled="true"] {
  padding-top: 7px;
  padding-bottom: 7px;
  background: rgba(4, 16, 22, 0.985);
  border-bottom-color: var(--line-strong);
}

.header-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
}

.header-capsule {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(10px, 1.6vw, 26px);
  min-height: 60px;
  padding: 8px 10px 8px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, rgba(14, 42, 53, 0.92), rgba(7, 26, 36, 0.94));
  box-shadow: 0 16px 34px -26px #000;
  transition: min-height var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}

.site-header[data-scrolled="true"] .header-capsule {
  min-height: 52px;
  border-color: rgba(169, 184, 190, 0.55);
}

/* 品牌方章 */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--mist);
  text-decoration: none;
}

.brand-lockup:hover { color: var(--mist); }

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  border: 1px solid var(--signal);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
  transition: background-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

.brand-lockup:hover .brand-mark {
  background: var(--signal);
  color: #08151b;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  white-space: nowrap;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.3;
  color: var(--silver);
  white-space: nowrap;
}

/* 主导航 */
.site-nav {
  display: flex;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--silver);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease), background-color var(--dur-1) var(--ease);
}

.nav-link:hover {
  color: var(--mist);
  background: rgba(110, 166, 184, 0.14);
}

.nav-link[aria-current="page"] {
  color: var(--signal);
  background: rgba(255, 122, 61, 0.1);
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 4px;
  height: 4px;
  margin-left: -2px;
  border-radius: 50%;
  background: var(--signal);
}

/* 右侧工具 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-self: end;
}

.header-help {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 16px;
  border: 1px solid rgba(255, 122, 61, 0.55);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1;
  color: var(--signal);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease),
    border-color var(--dur-1) var(--ease);
}

.header-help:hover {
  background: var(--signal);
  border-color: var(--signal);
  color: #08151b;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--mist);
  cursor: pointer;
  transition: border-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

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

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur-2) var(--ease);
}

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

.site-header[data-open="true"] .nav-toggle-bars::before {
  transform: translateY(4.25px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars::after {
  transform: translateY(-4.25px) rotate(-45deg);
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  left: 50%;
  top: 4px;
  z-index: 80;
  transform: translate(-50%, -160%);
  padding: 11px 22px;
  background: var(--signal);
  color: #08151b;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: transform var(--dur-1) var(--ease);
}

.skip-link:focus {
  transform: translate(-50%, 0);
  color: #08151b;
}

/* =========================================================
   页脚 · 档案封底
   ========================================================= */
.site-footer {
  position: relative;
  isolation: isolate;
  margin-top: clamp(64px, 9vw, 120px);
  background-color: var(--ink-900);
  border-top: 1px solid var(--line-strong);
  color: var(--silver);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.95), transparent 72%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.95), transparent 72%);
}

.footer-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 76px) var(--gutter) 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(260px, 1.2fr) 2fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}

.footer-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mist);
  text-decoration: none;
}

.footer-lockup::before {
  content: "";
  width: 8px;
  height: 18px;
  background: var(--signal);
}

.footer-lockup:hover { color: var(--signal); }

.footer-summary {
  margin: 18px 0 0;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

.footer-meta {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.6;
  color: var(--paper);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.footer-group-title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--paper);
}

.footer-group-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--silver);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}

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

/* 账本式联系栏 */
.footer-ledger {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(34px, 4.5vw, 56px);
  background: var(--line);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.ledger-cell {
  min-width: 0;
  padding: 18px clamp(14px, 1.6vw, 20px);
  background: var(--ink-900);
}

.ledger-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--paper);
}

.ledger-value {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  line-height: 1.6;
  color: var(--mist);
  overflow-wrap: anywhere;
}

/* 底部版权行 */
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--paper);
}

.footer-copy,
.footer-icp { margin: 0; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-legal a {
  color: var(--silver);
  text-decoration: none;
}

.footer-legal a:hover { color: var(--signal); }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: clamp(16px, 2.4vw, 32px);
  bottom: clamp(16px, 2.4vw, 32px);
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 17px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background-color: var(--ink-700);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  box-shadow: 0 18px 32px -24px #000;
  transition: opacity var(--dur-2) var(--ease), transform var(--dur-2) var(--ease),
    visibility var(--dur-2) linear, background-color var(--dur-1) var(--ease),
    color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  background-color: var(--signal);
  border-color: var(--signal);
  color: #08151b;
}

.to-top-arrow {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 6px solid currentColor;
}

.to-top-label { display: inline-block; }

/* =========================================================
   通用内容组件（供各页面复用）
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 96px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  line-height: 1.5;
  text-transform: uppercase;
  color: var(--signal);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: clamp(24px, 3vw, 40px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 650;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.section-lede {
  max-width: 62ch;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease),
    border-color var(--dur-1) var(--ease);
}

.btn--primary {
  background-color: var(--signal);
  border-color: var(--signal);
  color: #08151b;
}

.btn--primary:hover {
  background-color: var(--signal-soft);
  border-color: var(--signal-soft);
  color: #08151b;
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--line-strong);
  color: var(--mist);
}

.btn--ghost:hover {
  border-color: var(--signal);
  color: var(--signal);
}

/* 面包屑 */
.crumbs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--paper);
}

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

.crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.crumbs li + li::before {
  content: "/";
  color: rgba(169, 184, 190, 0.4);
}

.crumbs a {
  color: var(--silver);
  text-decoration: none;
}

.crumbs a:hover { color: var(--signal); }

/* 面板 */
.panel {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line);
  background-color: var(--panel);
  overflow: hidden;
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
}

.panel > * { position: relative; }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.5;
  text-transform: uppercase;
  color: var(--silver);
  white-space: nowrap;
}

.tag--signal {
  border-color: rgba(255, 122, 61, 0.55);
  color: var(--signal);
}

.tag--ok {
  border-color: rgba(100, 199, 184, 0.5);
  color: var(--teal);
}

/* 图片容器基座 */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background-color: var(--ink-900);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(169, 184, 190, 0.16);
  pointer-events: none;
}

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

/* 自适应卡片矩阵 */
.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: clamp(14px, 1.6vw, 22px);
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1100px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: clamp(28px, 4vw, 44px);
  }

  .footer-summary { max-width: 56ch; }

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

@media (max-width: 960px) {
  .header-capsule {
    grid-template-columns: 1fr auto;
    padding: 7px 8px 7px 14px;
    border-radius: 22px;
  }

  .brand-tag { display: none; }

  .header-help { display: none; }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    padding: 10px;
    border: 1px solid var(--line-strong);
    border-radius: 18px;
    background-color: var(--ink-700);
    box-shadow: 0 26px 44px -30px #000;
  }

  .site-header[data-open="true"] .site-nav { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-item { display: block; }

  .nav-link {
    display: block;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 15px;
  }

  .nav-link[aria-current="page"]::after {
    left: auto;
    right: 16px;
    bottom: 50%;
    margin-left: 0;
    margin-bottom: -2px;
  }

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

@media (max-width: 640px) {
  .site-header { padding-left: 12px; padding-right: 12px; }

  .brand-name { font-size: 14px; }

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

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .to-top {
    padding: 9px 14px;
    font-size: 10.5px;
  }
}

@media (max-width: 400px) {
  .footer-nav { grid-template-columns: 1fr; }
}

/* 减弱动效 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .footer-link:hover { transform: none; }

  .to-top { transform: none; }
}

@media print {
  .site-header,
  .site-footer .to-top,
  .skip-link { display: none !important; }
}