/* ============================================================
   博亚看台 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5,
p, ul, ol, li, figure, blockquote, figcaption {
  margin: 0;
}

ul, ol { padding: 0; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

::selection {
  background: var(--cyan);
  color: var(--ink);
}

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩：近单色体系 + 两个信号色 */
  --ink: #05100C;
  --ink-2: #0A1B16;
  --panel: #102A22;
  --line: #1B3A31;
  --white: #E9F2ED;
  --concrete: #8B9791;
  --moss: #AFC7BC;
  --cyan: #35E7C6;
  --signal: #FF7B33;
  --mid: #1C6B5E;

  /* 切角语言 */
  --cut: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  --cut-sm: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  --cut-tr: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);

  /* 字体 */
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-display: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  /* 栅格 */
  --edge: 72px;
  --gap: 24px;
  --max: 1320px;
  --radius: 0;

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

@media (max-width: 1100px) { :root { --edge: 40px; } }
@media (max-width: 640px)  { :root { --edge: 20px; } }

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--white);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 560px at 84% -12%, rgba(28, 107, 94, .30), transparent 68%),
    radial-gradient(900px 520px at -8% 108%, rgba(27, 58, 49, .55), transparent 70%);
  background-repeat: no-repeat;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.01em;
}

p { line-height: 1.65; }

.display-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.5rem, 6.6vw, 5.5rem);
  line-height: .92;
  letter-spacing: -.025em;
  text-transform: uppercase;
}

.display-title em {
  font-style: normal;
  color: var(--cyan);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--concrete);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--cyan);
}

.lede {
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.7;
  color: var(--moss);
  max-width: 38ch;
}

.prose { max-width: 64ch; }
.prose p + p { margin-top: 1em; }
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(53, 231, 198, .35);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

.num--xl {
  display: inline-block;
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.num--signal { color: var(--signal); }

.index-chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
  text-transform: uppercase;
}

/* ---------- 4. 容器与栅格 ---------- */
.shell {
  width: min(100% - (var(--edge) * 2), var(--max));
  margin-inline: auto;
}

.page-main { padding-block: clamp(28px, 4vw, 56px); }

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

.grid {
  display: grid;
  gap: var(--gap);
}

.grid--split {
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(24px, 4vw, 56px);
}

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

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

/* ---------- 5. 按钮与面板 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut);
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.btn:hover,
.btn:focus-visible {
  background: var(--white);
  color: var(--ink);
  border-color: var(--white);
}

.btn--solid {
  background: var(--cyan);
  color: var(--ink);
  border-color: transparent;
  font-weight: 700;
}

.btn--solid:hover,
.btn--solid:focus-visible {
  background: var(--white);
  color: var(--ink);
}

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--line);
  color: var(--white);
}

.btn--signal {
  background: transparent;
  border-color: rgba(255, 123, 51, .55);
  color: var(--signal);
}

.btn--signal:hover,
.btn--signal:focus-visible {
  background: var(--signal);
  color: var(--ink);
  border-color: var(--signal);
}

.cut-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut);
  padding: clamp(18px, 2.4vw, 26px);
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  margin-block: clamp(20px, 3vw, 36px);
}

/* ---------- 6. 标签与筛选 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--moss);
  background: rgba(16, 42, 34, .7);
  border: 1px solid var(--line);
}

.tag--cyan {
  color: var(--cyan);
  border-color: rgba(53, 231, 198, .42);
  background: rgba(28, 107, 94, .22);
}

.tag--signal {
  color: var(--signal);
  border-color: rgba(255, 123, 51, .42);
  background: rgba(255, 123, 51, .08);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-block: 4px;
}

.filter-btn {
  padding: 8px 16px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--concrete);
  background: transparent;
  border: 1px solid var(--line);
  clip-path: var(--cut-sm);
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.filter-btn:hover {
  color: var(--white);
  border-color: var(--moss);
}

.filter-btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

[data-filter-item] {
  transition: opacity .18s var(--ease), transform .18s var(--ease);
}

[data-filter-item].is-dim {
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
}

[data-filter-item].is-hidden { display: none; }

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: var(--cut-tr);
}

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.88) contrast(1.06) brightness(.92);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 12px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--moss);
  background: rgba(5, 16, 12, .78);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

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

.media-frame--diagonal {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 26px));
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  padding-block: 14px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--concrete);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb__link { color: var(--concrete); }
.breadcrumb__link:hover,
.breadcrumb__link:focus-visible { color: var(--cyan); }

.breadcrumb__sep { color: var(--line); }

.breadcrumb__current { color: var(--white); }

/* ---------- 9. 脉冲色带与滚动进度 ---------- */
.pulse-band {
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--mid) 20%,
    var(--cyan) 50%,
    var(--mid) 80%,
    transparent 100%);
  animation: pulse-breathe 4.2s ease-in-out infinite;
}

@keyframes pulse-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: .88; }
}

.scroll-pulse {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 90;
  background: rgba(27, 58, 49, .6);
  pointer-events: none;
}

.scroll-pulse__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--mid));
}

/* ---------- 10. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  background: var(--cyan);
  clip-path: var(--cut-sm);
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline-offset: 2px;
}

/* ---------- 11. 显现 ---------- */
.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.has-reveal [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(5, 16, 12, .96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

/* 上层：品牌与状态 */
.header-deck {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #071712 0%, var(--ink) 100%);
}

.header-deck__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 44px;
  padding-block: 9px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand__mark {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--cyan);
  padding: 3px 6px;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: var(--cut-sm);
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--white);
}

.brand__slogan {
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--concrete);
  padding-left: 10px;
  border-left: 1px solid var(--line);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  min-width: 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--concrete);
}

.status-chip__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(53, 231, 198, .55);
  animation: dot-pulse 4.2s ease-in-out infinite;
}

@keyframes dot-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(53, 231, 198, .5); }
  50% { box-shadow: 0 0 0 6px rgba(53, 231, 198, 0); }
}

.status-chip__text {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.utility-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  flex: 0 0 auto;
}

.utility-nav__link {
  display: inline-block;
  padding: 5px 10px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--concrete);
  border: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.utility-nav__link:hover,
.utility-nav__link:focus-visible {
  color: var(--white);
  border-color: var(--line);
}

.utility-nav__link[aria-current="page"] {
  color: var(--cyan);
  border-color: rgba(53, 231, 198, .4);
}

/* 下层：栏目轨道 */
.header-rail {
  background: linear-gradient(180deg, rgba(10, 27, 22, .92), rgba(5, 16, 12, .96));
}

.header-rail__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 58px;
}

.primary-nav { flex: 1 1 auto; min-width: 0; }

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.primary-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--moss);
  border: 1px solid transparent;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.primary-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--concrete);
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible {
  color: var(--white);
  background: var(--panel);
  border-color: var(--line);
}

.primary-nav__link[aria-current="page"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.primary-nav__link[aria-current="page"] .primary-nav__index {
  color: rgba(5, 16, 12, .6);
}

.rail-cta {
  flex: 0 0 auto;
  margin-left: auto;
  padding: 9px 18px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--signal);
  border: 1px solid rgba(255, 123, 51, .5);
  clip-path: var(--cut-sm);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.rail-cta:hover,
.rail-cta:focus-visible {
  background: var(--signal);
  color: var(--ink);
  border-color: var(--signal);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--moss);
  border: 1px solid var(--line);
  clip-path: var(--cut-sm);
}

.nav-toggle:hover,
.nav-toggle:focus-visible { color: var(--white); border-color: var(--moss); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 11px;
}

.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.nav-toggle[aria-expanded="true"] { color: var(--cyan); border-color: rgba(53, 231, 198, .5); }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: none; }
}

/* 平板 / 移动 */
@media (max-width: 1180px) {
  .primary-nav__link { padding: 10px 10px; font-size: 13px; }
  .primary-nav__link .primary-nav__index { display: none; }
}

@media (max-width: 900px) {
  .header-deck__inner { flex-wrap: wrap; row-gap: 8px; }
  .brand__slogan { display: none; }
  .status-chip { order: 3; flex-basis: 100%; margin-left: 0; }

  .header-rail__inner { flex-wrap: wrap; row-gap: 0; padding-block: 8px; }

  .nav-toggle { display: inline-flex; order: 1; }

  .rail-cta { order: 2; }

  .primary-nav {
    order: 3;
    display: none;
    flex-basis: 100%;
    width: auto;
    margin-inline: calc(var(--edge) * -1);
    padding: 6px var(--edge) 16px;
    background: linear-gradient(180deg, var(--ink-2), var(--ink));
    border-top: 1px solid var(--line);
  }

  .primary-nav[data-open="true"] {
    display: block;
    animation: nav-drop .24s var(--ease) both;
  }

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

  .primary-nav__link {
    width: 100%;
    padding: 14px 4px;
    font-size: 15px;
    border-bottom: 1px solid rgba(27, 58, 49, .7);
  }

  .primary-nav__link .primary-nav__index { display: inline-block; }
}

@media (max-width: 560px) {
  .brand__name { font-size: 15px; }
  .utility-nav__link { padding: 5px 7px; font-size: 10px; letter-spacing: .1em; }
  .rail-cta { padding: 8px 12px; font-size: 10px; letter-spacing: .12em; }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink) 0%, #07150F 60%, #040C09 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1.6fr) minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(38px, 5.5vw, 68px);
}

.footer-brand { display: flex; flex-direction: column; gap: 16px; }

.brand--footer { align-items: center; gap: 10px; }

.brand--footer .brand__name { font-size: 20px; }

.footer-brief {
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss);
  max-width: 32ch;
}

.footer-repeat {
  list-style: none;
  display: grid;
  gap: 8px;
  margin-top: 2px;
}

.footer-repeat__link {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan);
  border-bottom: 1px dashed rgba(53, 231, 198, .32);
  padding-bottom: 2px;
}

.footer-repeat__link:hover,
.footer-repeat__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.footer-heading {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--concrete);
  margin-bottom: 14px;
}

.footer-list { list-style: none; display: grid; gap: 9px; }

.footer-list__link {
  font-size: 14px;
  color: var(--moss);
  transition: color .18s var(--ease);
}

.footer-list__link:hover,
.footer-list__link:focus-visible { color: var(--cyan); }

.footer-list__link[aria-current="page"] {
  color: var(--white);
  border-bottom: 1px solid var(--cyan);
}

.footer-contact { min-width: 0; }

.footer-list--contact { gap: 8px; }

.footer-contact__line {
  font-size: 13px;
  line-height: 1.6;
  color: var(--moss);
  word-break: break-word;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  padding-block: 18px 28px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--concrete);
}

.footer-legal { font-size: 11px; letter-spacing: .14em; }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  list-style: none;
  margin-left: auto;
}

.footer-meta-link {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--concrete);
}

.footer-meta-link:hover,
.footer-meta-link:focus-visible { color: var(--cyan); }

@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal-links { margin-left: 0; }
}

@media (max-width: 420px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 12. 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .pulse-band,
  .status-chip__dot { animation: none !important; }

  .has-reveal [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  [data-filter-item].is-dim { opacity: 0 !important; transform: none !important; }
}