/* ============================================================
   纵横国际品牌 — 共享样式 /assets/site.css
   深夜控制台 × 航图：深墨蓝基座、电光青结构色、暖琥珀时间色
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; }

/* ---------- 2. 变量 ---------- */
:root {
  --c-ink: #0B1622;
  --c-ink-2: #12263A;
  --c-cyan: #25D8E0;
  --c-cyan-soft: #7FD6DE;
  --c-amber: #F2A45C;
  --c-amber-deep: #B96F2E;
  --c-paper: #F5F1EA;
  --c-text: #EAF2F7;
  --c-dim: #9AAEBD;
  --c-line: #2C4152;
  --c-line-soft: rgba(154, 174, 189, .24);

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;

  --topline-h: 68px;
  --rail-w: 136px;
  --gutter: clamp(1.15rem, 4vw, 4.5rem);
  --wrap-max: 1240px;

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

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--c-ink);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.85;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .3;
  background-image:
    linear-gradient(to right, rgba(44, 65, 82, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44, 65, 82, .5) 1px, transparent 1px);
  background-size: 96px 96px;
}
main { position: relative; z-index: 1; display: block; }
#main-content { display: block; scroll-margin-top: calc(var(--topline-h) + 1rem); }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 800; line-height: 1.24; letter-spacing: .02em; }
p { max-width: 68ch; }
strong { font-weight: 700; color: #FFFFFF; }
em { font-style: normal; color: var(--c-cyan-soft); }

a { color: var(--c-cyan); text-decoration: none; transition: color .22s var(--ease); }
a:hover { color: var(--c-cyan-soft); }

:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection { background: rgba(37, 216, 224, .32); color: #FFFFFF; }

/* ---------- 4. 工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.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: 0; left: 0; z-index: 120;
  transform: translateY(-140%);
  background: var(--c-amber); color: #2A1504;
  padding: .72rem 1.15rem; border-radius: 0 0 14px 0;
  font-size: .85rem; font-weight: 700; letter-spacing: .08em;
  transition: transform .22s var(--ease);
}
.skip-link:focus { transform: translateY(0); color: #2A1504; }
.rule { height: 1px; border: 0; background: var(--c-line); margin: 0; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .62rem 1.2rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: .82rem; font-weight: 600; letter-spacing: .08em;
  cursor: pointer;
  transition: transform .24s var(--ease), background-color .24s var(--ease),
              color .24s var(--ease), border-color .24s var(--ease);
}
.btn--solid { background: var(--c-cyan); color: #04141C; }
.btn--solid:hover { background: var(--c-cyan-soft); color: #04141C; transform: translateY(-2px); }
.btn--ghost { background: transparent; color: var(--c-text); border-color: var(--c-line); }
.btn--ghost:hover { color: var(--c-cyan); border-color: var(--c-cyan); transform: translateY(-2px); }
.btn--amber { background: var(--c-amber); color: #2A1504; }
.btn--amber:hover { background: var(--c-amber-deep); color: #FFF4E8; transform: translateY(-2px); }
.btn--block { width: 100%; }

/* ---------- 6. 头部：横向命令栏 ---------- */
.site-header { position: relative; z-index: 70; }

.topline {
  position: sticky; top: 0; z-index: 70;
  display: flex; align-items: center; gap: clamp(.6rem, 2vw, 1.8rem);
  min-height: var(--topline-h);
  padding: .55rem var(--gutter);
  background: linear-gradient(180deg, rgba(11, 22, 34, .97) 0%, rgba(11, 22, 34, .84) 100%);
  border-bottom: 1px solid var(--c-line);
  backdrop-filter: blur(10px);
}

.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--c-text); flex: 0 0 auto; }
.brand:hover { color: var(--c-text); }
.brand__mark {
  width: 2.35rem; height: 2.35rem; border-radius: 12px;
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 800; font-size: 1.02rem; letter-spacing: 0;
  color: #04141C;
  background: linear-gradient(140deg, var(--c-cyan) 0%, #179AA9 58%, var(--c-ink-2) 100%);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__name { font-family: var(--font-display); font-weight: 800; font-size: 1.05rem; letter-spacing: .1em; }
.brand__tag { font-size: .66rem; letter-spacing: .2em; color: var(--c-dim); }
.brand--footer .brand__mark { width: 2rem; height: 2rem; border-radius: 10px; font-size: .9rem; }
.brand--footer .brand__name { font-size: .98rem; }

.topline__motto {
  display: none;
  margin: 0 0 0 clamp(.5rem, 2vw, 1.6rem);
  padding-left: clamp(.5rem, 2vw, 1.6rem);
  border-left: 1px solid var(--c-line);
  font-size: .7rem; letter-spacing: .22em; color: var(--c-dim);
  white-space: nowrap;
}
.topline__actions { margin-left: auto; display: flex; align-items: center; gap: .55rem; }

.nav-toggle {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .52rem .95rem;
  background: transparent; color: var(--c-text);
  border: 1px solid var(--c-line); border-radius: var(--radius-pill);
  font-size: .78rem; letter-spacing: .14em; cursor: pointer;
  transition: border-color .22s var(--ease), color .22s var(--ease);
}
.nav-toggle:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.nav-toggle__bars { position: relative; width: 16px; height: 2px; border-radius: 2px; background: currentColor; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: ""; position: absolute; left: 0; width: 16px; height: 2px;
  border-radius: 2px; background: currentColor;
  transition: transform .24s var(--ease), top .24s var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

.nav-toggle__text { display: none; }

/* 轨道导航：移动端抽屉 */
.rail-nav { z-index: 90; }
.rail-nav__title {
  margin: 0 0 .85rem; padding: 0 .35rem;
  font-family: var(--font-body); font-size: .68rem; font-weight: 600;
  letter-spacing: .28em; color: var(--c-amber);
}
.rail-nav__list { display: flex; flex-direction: column; gap: .3rem; }
.rail-nav__item { margin: 0; }
.rail-nav__link {
  position: relative;
  display: flex; align-items: baseline; gap: .6rem;
  padding: .82rem 1rem;
  border-radius: 14px;
  color: var(--c-dim);
  font-size: 1rem; letter-spacing: .06em;
  transition: color .22s var(--ease), background-color .22s var(--ease), transform .22s var(--ease);
}
.rail-nav__link::before {
  content: ""; position: absolute; left: 0; top: 22%; bottom: 22%;
  width: 2px; border-radius: 2px; background: transparent;
  transition: background-color .22s var(--ease);
}
.rail-nav__link:hover { color: var(--c-text); background: rgba(37, 216, 224, .08); transform: translateX(3px); }
.rail-nav__link:hover::before { background: var(--c-cyan-soft); }
.rail-nav__link[aria-current="page"] { color: var(--c-cyan); background: rgba(37, 216, 224, .12); }
.rail-nav__link[aria-current="page"]::before { background: var(--c-cyan); }
.rail-nav__index {
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .1em;
  color: var(--c-dim); opacity: .62;
}
.rail-nav__link[aria-current="page"] .rail-nav__index { color: var(--c-cyan); opacity: 1; }
.rail-nav__label { font-weight: 600; }
.rail-nav__foot {
  margin: 1.4rem 0 0; padding: .9rem .35rem 0;
  border-top: 1px dashed var(--c-line-soft);
  font-size: .68rem; letter-spacing: .14em; color: var(--c-dim); line-height: 1.7;
}

.nav-scrim {
  position: fixed; inset: 0; z-index: 85;
  background: rgba(4, 10, 16, .7);
  opacity: 0; visibility: hidden;
  transition: opacity .3s var(--ease), visibility .3s var(--ease);
}
.nav-scrim.is-on { opacity: 1; visibility: visible; }

@media (max-width: 1023px) {
  .rail-nav {
    position: fixed; top: 0; right: 0; bottom: 0; left: auto;
    width: min(320px, 86vw);
    padding: 2.6rem 1.2rem 2rem;
    overflow-y: auto;
    background: linear-gradient(200deg, var(--c-ink-2) 0%, var(--c-ink) 100%);
    border-left: 1px solid var(--c-line);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform .34s var(--ease), visibility .34s var(--ease);
  }
  .rail-nav[data-open] { transform: translateX(0); visibility: visible; }
  body.is-nav-open { overflow: hidden; }
}

@media (min-width: 480px) {
  .nav-toggle__text { display: inline; }
}

@media (min-width: 768px) {
  .topline__motto { display: block; }
}

/* 桌面端：顶部固定 + 左侧轨道 */
@media (min-width: 1024px) {
  :root { --rail-w: 152px; }
  body { padding-top: var(--topline-h); padding-left: var(--rail-w); }
  .topline { position: fixed; top: 0; left: 0; right: 0; }
  .nav-toggle { display: none; }
  .nav-scrim { display: none; }
  .rail-nav {
    position: fixed; left: 0; top: var(--topline-h); bottom: 0;
    width: var(--rail-w);
    display: flex; flex-direction: column;
    padding: 1.7rem 0 1.2rem;
    overflow-y: auto;
    background: linear-gradient(180deg, rgba(18, 38, 58, .62) 0%, rgba(11, 22, 34, .9) 100%);
    border-right: 1px solid var(--c-line);
  }
  .rail-nav__title { padding-inline: 1.15rem; }
  .rail-nav__list { gap: .1rem; }
  .rail-nav__link {
    padding: .62rem 1.15rem;
    border-radius: 0 14px 14px 0;
    font-size: .86rem;
  }
  .rail-nav__foot { margin: auto 1.15rem 0; padding-inline: 0; }
}

@media (min-width: 1280px) {
  :root { --rail-w: 168px; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative; z-index: 1;
  margin-top: clamp(3rem, 9vw, 7rem);
  border-top: 1px solid var(--c-line);
  background: linear-gradient(180deg, rgba(18, 38, 58, .82) 0%, rgba(11, 22, 34, 1) 64%);
}
.footer__inner {
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding: clamp(2.2rem, 5vw, 3.4rem) var(--gutter) 1.6rem;
}
.footer__top {
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  grid-template-columns: 1fr;
  padding-bottom: clamp(1.6rem, 4vw, 2.6rem);
}
.footer__blurb {
  margin-top: .95rem;
  max-width: 34ch;
  font-size: .88rem; line-height: 1.8;
  color: var(--c-dim);
}
.footer__cols {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}
.footer__col-title {
  margin: 0 0 .7rem;
  font-family: var(--font-body);
  font-size: .72rem; font-weight: 600; letter-spacing: .24em;
  color: var(--c-amber);
}
.footer__links li { margin: 0; }
.footer__links a {
  display: inline-block;
  padding: .24rem 0;
  color: var(--c-dim);
  font-size: .89rem;
  transition: color .22s var(--ease), transform .22s var(--ease);
}
.footer__links a:hover { color: var(--c-cyan); transform: translateX(3px); }
.footer__links a[aria-current="page"] { color: var(--c-cyan-soft); }

.footer__ticker { display: none; }
.ticker__track { margin: 0; }
.ticker__item {
  font-size: .72rem; letter-spacing: .22em;
  color: var(--c-dim);
  padding: .62rem 0;
  border-bottom: 1px dashed var(--c-line-soft);
}

.footer__contact {
  display: flex; flex-wrap: wrap; gap: .55rem 2rem;
  justify-content: space-between;
  padding: 1.4rem 0;
  border-top: 1px solid var(--c-line);
  font-size: .84rem; line-height: 1.8;
  color: var(--c-dim);
}
.footer__contact-line { margin: 0; max-width: 62ch; }
.footer__note { margin: 0; max-width: 40ch; color: rgba(154, 174, 189, .78); }

.footer__legal {
  display: flex; flex-wrap: wrap; gap: .4rem 1.8rem;
  justify-content: space-between;
  padding-top: 1.1rem;
  border-top: 1px dashed var(--c-line-soft);
  font-size: .78rem; letter-spacing: .06em;
  color: rgba(154, 174, 189, .78);
}
.footer__copy, .footer__icp { margin: 0; }

@keyframes ticker-scroll {
  from { transform: translateY(0); }
  to { transform: translateY(-50%); }
}

@media (min-width: 768px) {
  .footer__top { grid-template-columns: minmax(200px, 1fr) minmax(0, 1.9fr); }
}
@media (min-width: 1024px) {
  .footer__top { grid-template-columns: minmax(220px, 1.05fr) minmax(0, 1.9fr) 132px; }
  .footer__ticker {
    display: block; position: relative;
    height: 216px; overflow: hidden;
    padding-left: 1.1rem;
    border-left: 1px solid var(--c-line);
  }
  .footer__ticker::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 64px;
    background: linear-gradient(180deg, rgba(11, 22, 34, 0) 0%, var(--c-ink) 88%);
    pointer-events: none;
  }
  .ticker__track { animation: ticker-scroll 40s linear infinite; }
  .footer__ticker:hover .ticker__track { animation-play-state: paused; }
}

/* ---------- 8. 通用内容组件 ---------- */
.breadcrumb { padding: 1.1rem 0 .2rem; }
.breadcrumb__list {
  display: flex; flex-wrap: wrap; align-items: center; gap: .45rem;
  font-size: .76rem; letter-spacing: .1em; color: var(--c-dim);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: .45rem; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: var(--c-line); }
.breadcrumb__link { color: var(--c-dim); }
.breadcrumb__link:hover { color: var(--c-cyan); }

.section-head { display: grid; gap: .7rem; margin-bottom: clamp(1.4rem, 3vw, 2.2rem); }
.section-head__kicker {
  font-size: .72rem; font-weight: 600; letter-spacing: .28em;
  color: var(--c-amber);
}
.section-head__title {
  font-size: clamp(1.85rem, 3.6vw, 3rem);
  line-height: 1.22;
  color: var(--c-text);
}
.section-head__note { max-width: 46ch; font-size: .92rem; color: var(--c-dim); }

.grid { display: grid; gap: clamp(1rem, 2.4vw, 1.6rem); grid-template-columns: 1fr; }

.panel {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.7rem);
  border-radius: var(--radius-md);
  border: 1px solid var(--c-line);
  background: rgba(18, 38, 58, .6);
  transition: transform .26s var(--ease), border-color .26s var(--ease), background-color .26s var(--ease);
}
.panel:hover { transform: translateY(-2px); border-color: var(--c-cyan); }
.panel__title {
  margin: 0 0 .45rem;
  font-size: 1.12rem; font-weight: 700; letter-spacing: .02em;
}
.panel__text { margin: 0; font-size: .92rem; line-height: 1.85; color: var(--c-dim); }
.panel--cyan {
  border-color: rgba(37, 216, 224, .42);
  background: linear-gradient(150deg, rgba(37, 216, 224, .13) 0%, rgba(18, 38, 58, .62) 100%);
}
.panel--amber {
  border-color: rgba(242, 164, 92, .42);
  background: linear-gradient(150deg, rgba(242, 164, 92, .13) 0%, rgba(18, 38, 58, .62) 100%);
}
.panel--paper { background: var(--c-paper); border-color: rgba(11, 22, 34, .1); color: #22303C; }
.panel--paper .panel__title { color: #16222C; }
.panel--paper .panel__text { color: rgba(34, 48, 60, .74); }

.band {
  display: flex; flex-wrap: wrap; align-items: center; gap: .7rem 1.4rem;
  padding: .95rem clamp(1rem, 2.4vw, 1.7rem);
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-line);
  background: linear-gradient(90deg, rgba(37, 216, 224, .13) 0%, rgba(18, 38, 58, .45) 46%, rgba(242, 164, 92, .13) 100%);
}
.band__label {
  font-size: .72rem; font-weight: 600; letter-spacing: .26em;
  color: var(--c-cyan-soft);
}

/* ---------- 9. 响应式图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  background:
    radial-gradient(120% 90% at 12% 8%, rgba(37, 216, 224, .2) 0%, rgba(37, 216, 224, 0) 55%),
    radial-gradient(90% 80% at 88% 92%, rgba(242, 164, 92, .16) 0%, rgba(242, 164, 92, 0) 58%),
    linear-gradient(160deg, var(--c-ink-2) 0%, var(--c-ink) 100%);
}
.media-frame::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(to right, rgba(44, 65, 82, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44, 65, 82, .55) 1px, transparent 1px);
  background-size: 44px 44px;
}
.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame__img {
  position: relative; z-index: 1;
  width: 100%; height: 100%;
  object-fit: cover;
}
.media-frame__caption {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: .7rem 1.1rem;
  border-top: 1px solid var(--c-line);
  background: rgba(11, 22, 34, .74);
  font-size: .75rem; letter-spacing: .1em; color: var(--c-dim);
}

/* ---------- 10. 动效与交互协议 ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0;
  height: 2px; z-index: 95;
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--c-cyan) 0%, var(--c-amber) 100%);
  transition: width .12s linear;
}

.js-reveal [data-reveal] { opacity: 0; transform: translateY(12px); }
.js-reveal [data-reveal].is-visible {
  opacity: 1; transform: none;
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}

@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 767px) {
  body { font-size: 16px; }
  .footer__contact { flex-direction: column; }
  .footer__legal { flex-direction: column; }
}

/* ---------- 11. 无障碍偏好 ---------- */
@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-reveal [data-reveal] { opacity: 1; transform: none; }
  .ticker__track { animation: none !important; }
  .footer__ticker { overflow-y: auto; }
  .scroll-progress__bar { transition: none; }
}