/* =========================================================
   亚洲城中心 · 共享样式表 /assets/site.css
   夜航靛蓝底 + 暖橙强调 + 霓虹青索引
   ========================================================= */

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

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

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

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

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

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

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

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

/* ---------- tokens ---------- */
:root {
  --ink: #0F1A36;
  --ink-2: #16244A;
  --ink-3: #2B4A96;
  --orange: #FF7A2C;
  --orange-soft: #FFB473;
  --neon: #35E3C9;
  --mist: #F3F5FB;
  --slate: #98A3C4;
  --deep: #070C1C;
  --line: #2E3C66;

  --wrap: 1200px;
  --gut: clamp(16px, 4vw, 40px);

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

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 220ms;
}

/* ---------- 基础排版 ---------- */
body {
  min-height: 100vh;
  margin: 0;
  background-color: var(--ink);
  background-image: radial-gradient(140% 90% at 78% 0%, #16244A 0%, #0F1A36 46%, #070C1C 100%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1.3;
  color: var(--mist);
}

h1 { font-size: clamp(32px, 5.2vw, 46px); }
h2 { font-size: clamp(25px, 3.6vw, 34px); }
h3 { font-size: clamp(20px, 2.5vw, 26px); }
h4 { font-size: 19px; }

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

::selection {
  background: var(--orange);
  color: var(--deep);
}

/* ---------- 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.prose {
  max-width: 660px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

.prose p + p { margin-top: 1.1em; }

.prose h2 { margin-top: 1.6em; margin-bottom: .5em; }
.prose h3 { margin-top: 1.3em; margin-bottom: .4em; }
.prose ul { margin-top: .8em; }
.prose ul li {
  position: relative;
  padding-left: 1.35em;
  margin-bottom: .5em;
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 9px;
  height: 2px;
  background: var(--orange);
}

#main-content { scroll-margin-top: 110px; }

/* ---------- 等宽索引层 ---------- */
.mono-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--neon);
  text-transform: uppercase;
}

/* ---------- 通用链接 ---------- */
.link {
  color: var(--mist);
  background-image: linear-gradient(var(--neon), var(--neon));
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  padding-bottom: 2px;
  transition: background-size var(--dur) var(--ease), color var(--dur) var(--ease);
}
.link:hover,
.link:focus-visible {
  color: var(--neon);
  background-size: 100% 1px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--deep);
  background: var(--orange);
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:hover { background: var(--orange-soft); transform: translateY(-2px); }

.btn--ghost {
  color: var(--mist);
  background:
    linear-gradient(var(--ink-2), var(--ink-2)) padding-box,
    var(--line) border-box;
  border: 1px solid transparent;
}
.btn--ghost:hover {
  color: var(--neon);
  background:
    linear-gradient(var(--ink-3), var(--ink-3)) padding-box,
    var(--neon) border-box;
  transform: translateY(-2px);
}

/* ---------- 面包屑 ---------- */
.crumbs { padding-top: 18px; }

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate);
}

.crumbs__list li { display: inline-flex; align-items: center; }

.crumbs__list li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--line);
}

.crumbs__list a { color: var(--slate); transition: color var(--dur) var(--ease); }
.crumbs__list a:hover { color: var(--neon); }
.crumbs__list [aria-current="page"] { color: var(--mist); }

/* ---------- 面板与网格 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.panel:hover { border-color: var(--neon); }

.grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 30px);
}
.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)); }

/* ---------- 响应式图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink-2), var(--deep));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 26, 54, .16) 0%, rgba(7, 12, 28, .66) 100%);
  pointer-events: none;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3  { aspect-ratio: 4 / 3; }
.media-frame--3x4  { aspect-ratio: 3 / 4; }
.media-frame--1x1  { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--deep);
  background: var(--neon);
  transform: translateY(-300%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* =========================================================
   头部
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(15, 26, 54, .96);
  border-bottom: 1px solid var(--line);
}

/* 上层：品牌说明带 */
.header-brandbar {
  max-height: 90px;
  overflow: hidden;
  background: var(--deep);
  border-bottom: 1px solid var(--line);
  opacity: 1;
  transition: max-height 280ms var(--ease), opacity 200ms var(--ease);
}

.site-header[data-scrolled] .header-brandbar {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.brandbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-block: 9px;
  font-size: 12.5px;
}

.brandbar-sign {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--slate);
  letter-spacing: .04em;
  white-space: nowrap;
  overflow: hidden;
}

.brandbar-sign strong {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist);
}

.brandbar-dot {
  flex: none;
  width: 5px;
  height: 5px;
  background: var(--neon);
  transform: rotate(45deg);
}

.brandbar-word {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.brandbar-links {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: none;
}

.brandbar-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
  padding-bottom: 2px;
  background-image: linear-gradient(var(--neon), var(--neon));
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  transition: color var(--dur) var(--ease), background-size var(--dur) var(--ease);
}
.brandbar-link:hover,
.brandbar-link:focus-visible {
  color: var(--neon);
  background-size: 100% 1px;
}

/* 下层：栏目条 */
.header-mainbar {
  position: relative;
  background: transparent;
}

.mainbar-inner {
  display: flex;
  align-items: center;
  gap: 22px;
  padding-block: 10px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  color: var(--mist);
}

.brand-mark__glyph {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0;
  color: var(--deep);
  background: linear-gradient(140deg, var(--orange) 0%, #FF9A56 100%);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: background var(--dur) var(--ease);
}

.brand-mark__text {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: .08em;
  white-space: nowrap;
}

.brand-mark:hover .brand-mark__glyph {
  background: linear-gradient(140deg, var(--orange-soft) 0%, var(--neon) 100%);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
  background: var(--ink-2);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--neon); color: var(--neon); }

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

.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__list a {
  position: relative;
  isolation: isolate;
  display: block;
  padding: 11px 16px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.site-nav__list a::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible { color: var(--deep); }
.site-nav__list a:hover::before,
.site-nav__list a:focus-visible::before { transform: scaleX(1); }

.site-nav__list a[aria-current="page"] { color: var(--deep); }
.site-nav__list a[aria-current="page"]::before { transform: scaleX(1); }

.nav-cta {
  flex: none;
  margin-left: 10px;
  padding: 11px 20px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
  color: var(--deep);
  background: var(--orange);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: background-color var(--dur) var(--ease);
}
.nav-cta:hover { background: var(--orange-soft); }

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(40px, 6vw, 72px);
  background: var(--deep);
  border-top: 1px solid var(--line);
  color: var(--slate);
  font-size: 14.5px;
  line-height: 1.8;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--orange) 0%, var(--orange) 22%,
    var(--neon) 22%, var(--neon) 30%,
    var(--ink-3) 30%, var(--ink-3) 100%
  );
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.6fr;
  gap: clamp(24px, 3.4vw, 44px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.footer-brand,
.footer-nav,
.footer-legal,
.footer-contact { min-width: 0; }

.footer-brand__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: .08em;
  color: var(--mist);
}

.footer-brand__line {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
}

.footer-brand__icp {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--slate);
}

.footer-brand__copy {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--slate);
}

.footer-heading {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
  text-transform: uppercase;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-list a {
  display: inline-block;
  font-size: 14px;
  color: var(--slate);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--orange-soft);
  padding-left: 6px;
}

.footer-contact p {
  margin-bottom: 12px;
  color: var(--mist);
  font-size: 14px;
  word-break: break-word;
}

.footer-label {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--neon);
}

.footer-base {
  border-top: 1px solid rgba(46, 60, 102, .7);
  padding-top: 16px;
  padding-bottom: 24px;
}

.footer-base__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

/* =========================================================
   滚动进度
   ========================================================= */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  width: 100%;
  height: 3px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* =========================================================
   滚动淡入
   ========================================================= */
body[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
}

body[data-js="on"] [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 90;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    transition: max-height 300ms var(--ease), visibility 300ms var(--ease);
  }

  .site-header[data-open] .site-nav {
    max-height: min(74vh, 600px);
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__list a {
    padding: 16px var(--gut);
    font-size: 16px;
    border-bottom: 1px solid rgba(46, 60, 102, .7);
    transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  }

  .site-nav__list a::before { display: none; }

  .site-nav__list a:hover,
  .site-nav__list a:focus-visible {
    color: var(--orange-soft);
    background: rgba(43, 74, 150, .28);
  }

  .site-nav__list a[aria-current="page"] {
    color: var(--deep);
    background: var(--orange);
  }

  .site-nav__list a[aria-current="page"]:hover { color: var(--deep); }

  .nav-cta {
    margin: 16px var(--gut) 20px;
    padding: 14px 20px;
    text-align: center;
  }
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .brandbar-word { display: none; }

  .brandbar-inner { justify-content: flex-start; }

  .brandbar-links { margin-left: auto; gap: 14px; }

  .brand-mark__text { font-size: 17px; }
  .brand-mark__glyph { width: 36px; height: 36px; font-size: 17px; }

  .mainbar-inner { gap: 14px; }
}

@media (max-width: 600px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  #main-content { scroll-margin-top: 84px; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  body[data-js="on"] [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .btn:hover,
  .btn--ghost:hover { transform: none; }
}