:root {
  --navy-900: #081726;
  --navy-800: #12294A;
  --navy-700: #1B3557;
  --line: #2C4A72;
  --gold: #F2C14E;
  --gold-soft: #F7DA8E;
  --green: #2FA36B;
  --orange: #FF7A3D;
  --ice: #E8EEF6;
  --mist: #8FA3BC;

  --rail-w: 88px;
  --topbar-h: 72px;
  --shell-max: 1440px;
  --gutter: clamp(1.15rem, 4vw, 3.25rem);

  --font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Helvetica Neue", "Arial Narrow", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 240ms;
  --r-sm: 2px;
}

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

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

body {
  margin: 0;
  padding-left: var(--rail-w);
  min-height: 100vh;
  background-color: var(--navy-900);
  background-image:
    radial-gradient(900px 520px at 88% -8%, rgba(242, 193, 78, 0.07), transparent 62%),
    radial-gradient(700px 420px at 2% 92%, rgba(47, 163, 107, 0.05), transparent 60%);
  background-repeat: no-repeat;
  color: var(--ice);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ice);
}

h1 { font-size: clamp(2.4rem, 6.2vw, 4.6rem); }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.6rem); }
h3 { font-size: clamp(1.25rem, 2.2vw, 1.6rem); font-weight: 400; }
h4 { font-size: 1.05rem; font-weight: 500; letter-spacing: 0.02em; }

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

ul, ol { margin: 0 0 1.1em; padding-left: 1.15rem; }

a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-soft); }

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

button { font: inherit; color: inherit; }

::selection { background-color: var(--gold); color: var(--navy-900); }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

main { display: block; padding-top: var(--topbar-h); }

#main-content { scroll-margin-top: calc(var(--topbar-h) + 16px); }

/* ---------- 通用容器与网格 ---------- */

.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid { display: grid; gap: clamp(1rem, 2.4vw, 1.75rem); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--main { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

/* ---------- 索引标签 / 分隔短线 / 面包屑 ---------- */

.index-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.index-label--gold { color: var(--gold); }

.rule {
  display: block;
  width: 64px;
  height: 1px;
  border: 0;
  margin: 1rem 0 1.25rem;
  background-color: var(--gold);
}

.rule--sm { width: 40px; }
.rule--xs { width: 24px; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 0.55rem; }
.breadcrumb li + li::before { content: "/"; color: rgba(143, 163, 188, 0.5); }
.breadcrumb a { color: var(--mist); transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb [aria-current="page"] { color: var(--ice); }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.78rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background-color: transparent;
  color: var(--ice);
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.btn--gold {
  background-color: var(--gold);
  border-color: var(--gold);
  color: var(--navy-900);
}

.btn--gold:hover {
  background-color: var(--gold-soft);
  border-color: var(--gold-soft);
  color: var(--navy-900);
}

.btn--ghost { border-color: rgba(44, 74, 114, 0.9); color: var(--ice); }
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }

/* ---------- 卡片 / 图片容器 ---------- */

.card {
  position: relative;
  padding: clamp(1.15rem, 2.4vw, 1.75rem);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background-color: var(--navy-800);
}

.card--solid { background-color: var(--navy-700); }

.card--glass {
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.035));
  background-color: rgba(18, 41, 74, 0.55);
  border-color: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card--tick::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -1px;
  width: 1px;
  background-image: repeating-linear-gradient(to bottom, var(--line) 0 1px, transparent 1px 12px);
  pointer-events: none;
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--navy-800);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.media-frame > img,
.media-frame > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.86) brightness(0.92) contrast(1.05);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame--lit::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(60% 55% at 78% 16%, rgba(242, 193, 78, 0.22), transparent 70%);
  pointer-events: none;
}

/* ---------- 轮次徽章 / 数字锚点 / 数据标记 ---------- */

.round-badge {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  color: var(--mist);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.round-badge[data-state="active"] {
  border-color: var(--gold);
  color: var(--gold);
}

.round-badge[data-state="done"] {
  background-color: var(--gold);
  border-color: var(--gold);
  color: var(--navy-900);
}

.stat { display: flex; flex-direction: column; gap: 0.35rem; }

.stat-number {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6.5vw, 4.75rem);
  font-weight: 700;
  line-height: 0.88;
  letter-spacing: -0.02em;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.stat-number--gold { color: var(--gold); }
.stat-number--green { color: var(--green); }
.stat-number--orange { color: var(--orange); }

.stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  text-align: right;
}

.delta { font-size: 0.8rem; font-variant-numeric: tabular-nums; }
.delta--up { color: var(--green); }
.delta--down { color: var(--orange); }

/* ---------- 滚动显现 ---------- */

.reveal-armed {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

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

/* ---------- 头部：品牌轨道 ---------- */

.site-header { position: relative; z-index: 60; }

.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -130%);
  padding: 0.7rem 1.2rem;
  background-color: var(--gold);
  color: var(--navy-900);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); color: var(--navy-900); }

.brand-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: var(--rail-w);
  overflow: hidden;
  background-color: rgba(8, 23, 38, 0.72);
  border-right: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.rail-mark {
  display: flex;
  flex: none;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  padding: 1.5rem 0 0.5rem;
  color: var(--ice);
  text-decoration: none;
}

.rail-glyph {
  flex: none;
  width: 10px;
  height: 10px;
  background-color: var(--gold);
  transform: rotate(45deg);
}

.rail-word {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--ice);
  white-space: nowrap;
}

.rail-mark:hover .rail-word { color: var(--gold); }

.rail-scale {
  flex: 1 1 auto;
  width: 1px;
  min-height: 40px;
  margin: 1.25rem 0;
  background-image: repeating-linear-gradient(to bottom, var(--line) 0 1px, transparent 1px 24px);
}

.rail-progress {
  position: absolute;
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  background-color: rgba(44, 74, 114, 0.55);
  pointer-events: none;
}

.rail-progress > span {
  display: block;
  width: 100%;
  height: 0;
  background-image: linear-gradient(to bottom, var(--gold), var(--gold-soft));
  box-shadow: 0 0 10px rgba(242, 193, 78, 0.45);
  transition: height 120ms linear;
}

/* ---------- 头部：顶栏 ---------- */

.topbar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  z-index: 70;
  height: var(--topbar-h);
  background-color: rgba(8, 23, 38, 0);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.topbar::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(180deg, rgba(8, 23, 38, 0.88) 0%, rgba(8, 23, 38, 0.45) 55%, rgba(8, 23, 38, 0) 100%);
  opacity: 1;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}

.site-header[data-scrolled] .topbar {
  background-color: rgba(8, 23, 38, 0.94);
  border-bottom-color: var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header[data-scrolled] .topbar::before { opacity: 0; }

.topbar-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 2rem);
  height: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2.75rem);
}

.topbar-brand {
  display: none;
  flex: none;
  flex-direction: column;
  line-height: 1.15;
  text-decoration: none;
}

.topbar-brand-name { font-size: 0.95rem; letter-spacing: 0.06em; color: var(--ice); }
.topbar-brand-sub { font-size: 0.62rem; letter-spacing: 0.2em; color: var(--mist); }

.nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 1.7vw, 1.75rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0;
  color: var(--mist);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.15rem;
  height: 1px;
  background-color: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.nav-link:hover { color: var(--ice); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--gold); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-cta {
  flex: none;
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.58rem 1.05rem;
  border: 1px solid rgba(242, 193, 78, 0.55);
  color: var(--gold);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-cta:hover {
  background-color: var(--gold);
  border-color: var(--gold);
  color: var(--navy-900);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.7rem;
  background-color: transparent;
  border: 1px solid var(--line);
  color: var(--ice);
  font-family: inherit;
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  flex: none;
}

.nav-toggle-bars i {
  display: block;
  width: 100%;
  height: 1px;
  background-color: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child { transform: translateY(2.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child { transform: translateY(-2.5px) rotate(-45deg); }

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  margin-top: clamp(4rem, 9vw, 8rem);
  background-color: #061220;
  border-top: 1px solid var(--line);
  color: var(--mist);
  font-size: 0.88rem;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(120px, 20vw, 300px);
  height: 1px;
  background-color: var(--gold);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2.4fr);
  gap: clamp(2rem, 5vw, 5rem);
  padding-top: clamp(2.5rem, 5vw, 4.5rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
}

.footer-glyph {
  display: block;
  width: 12px;
  height: 12px;
  margin-bottom: 1.1rem;
  background-color: var(--gold);
  transform: rotate(45deg);
}

.footer-name {
  margin: 0 0 0.45rem;
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.footer-slogan {
  margin: 0;
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.footer-col-title {
  margin: 0 0 1rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ice);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  color: var(--mist);
  font-size: 0.84rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem clamp(1.5rem, 4vw, 3rem);
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  border-top: 1px solid rgba(44, 74, 114, 0.6);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.footer-contact-item { margin: 0; color: var(--mist); }

.footer-contact-key {
  margin-right: 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--ice);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1.15rem;
  padding-bottom: 2.25rem;
  border-top: 1px solid rgba(44, 74, 114, 0.6);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.footer-bottom p { margin: 0; }
.footer-icp { color: rgba(143, 163, 188, 0.8); }

/* ---------- 平板 ---------- */

@media (max-width: 1080px) {
  .nav-list { gap: 0.85rem; }
  .nav-link { font-size: 0.84rem; }
  .nav-cta { font-size: 0.74rem; padding: 0.5rem 0.85rem; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 移动端 ---------- */

@media (max-width: 900px) {
  :root { --rail-w: 0px; --topbar-h: 64px; }

  body { padding-left: 0; }

  .brand-rail { display: none; }

  .topbar { left: 0; }

  .topbar-brand { display: flex; }

  .topbar-inner { padding-inline: 1.15rem; }

  .nav {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    right: 0;
    margin-left: 0;
    max-height: calc(100vh - var(--topbar-h));
    max-height: calc(100dvh - var(--topbar-h));
    overflow-y: auto;
    padding: 1rem 1.15rem 2rem;
    background-color: rgba(8, 23, 38, 0.98);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
  }

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

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

  .nav-link {
    display: block;
    padding: 0.9rem 0;
    font-size: 1rem;
    border-bottom: 1px solid rgba(44, 74, 114, 0.5);
  }

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

  .nav-cta { display: none; }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .grid--2,
  .grid--3,
  .grid--4,
  .grid--main { grid-template-columns: minmax(0, 1fr); }

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

@media (max-width: 520px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }

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

  .footer-contact { flex-direction: column; gap: 0.4rem; }
}

/* ---------- 减少动态效果 ---------- */

@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;
  }

  .reveal-armed { opacity: 1 !important; transform: none !important; }
}