/* ==========================================================================
   博鱼主站 · 共享样式表 /assets/site.css
   深海蓝 + 珊瑚橙 · 纵向海洋数据长卷外壳
   ========================================================================== */

:root {
  --deep-sea: #0A2E4A;
  --tide: #1E8A8A;
  --coral: #FF6B4A;
  --coral-deep: #E85535;
  --sand: #F5F0E8;
  --moon: #FFFFFF;
  --night: #061A2B;
  --mist: #D9E2E8;
  --kelp: #2F7D6B;
  --amber: #F2B84B;
  --amber-ink: #8C6012;
  --steel: #5C7285;

  --font-serif: Georgia, "Songti SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --radius-card: 14px;
  --radius-pill: 999px;
  --maxw: 1220px;
  --pad-gutter: clamp(16px, 4vw, 48px);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --shadow-lift: 0 20px 44px -30px rgba(6, 26, 43, .65);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 110px;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: .01em;
  color: var(--deep-sea);
  background-color: var(--sand);
  background-image:
    radial-gradient(circle at 10% -6%, rgba(30, 138, 138, .16), transparent 46%),
    radial-gradient(circle at 92% 2%, rgba(255, 107, 74, .10), transparent 42%);
  background-repeat: no-repeat;
}

img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, h4, p, figure, blockquote { margin: 0; }
table { border-collapse: collapse; }

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

::selection { background: rgba(255, 107, 74, .28); }

#main-content { display: block; }

/* ---------- 中文排版基调 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -.005em;
  color: var(--deep-sea);
}
h1 { font-size: clamp(2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 1.9vw, 1.55rem); font-weight: 600; }
h4 { font-size: 1.06rem; font-weight: 600; }

p { max-width: 72ch; }

.num,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 200;
  display: inline-block;
  padding: 10px 20px;
  background: var(--coral);
  color: #fff;
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .06em;
  border-radius: 0 0 14px 14px;
  transition: top .25s var(--ease);
}
.skip-link:focus { top: 0; }

/* ==========================================================================
   页头 · 悬浮胶囊浮岛
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: 10px clamp(12px, 3vw, 28px) 14px;
  background: linear-gradient(180deg, rgba(6, 26, 43, .97), rgba(10, 46, 74, .88));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(217, 226, 232, .16);
}

.header-dock {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 8px 10px 8px 16px;
  border: 1px solid rgba(217, 226, 232, .18);
  border-radius: var(--radius-pill);
  background: rgba(245, 240, 232, .06);
}

/* 品牌岛 */
.brand-island {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: var(--moon);
}
.brand-island__mark {
  position: relative;
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(150deg, var(--coral), var(--coral-deep));
  box-shadow: 0 10px 20px -12px rgba(255, 107, 74, .95);
}
.brand-island__mark::before,
.brand-island__mark::after {
  content: "";
  position: absolute;
  left: 7px;
  height: 2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, .94);
}
.brand-island__mark::before { top: 11px; right: 7px; }
.brand-island__mark::after { top: 17px; right: 12px; }
.brand-island__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-island__name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--moon);
}
.brand-island__tag {
  font-size: .64rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(217, 226, 232, .7);
}

/* 导航胶囊 */
.nav-pill {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
}
.nav-pill__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-pill__link {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: .92rem;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
  color: rgba(245, 240, 232, .82);
  transition: color .25s var(--ease), background-color .25s var(--ease);
}
.nav-pill__link:hover { color: var(--moon); background: rgba(245, 240, 232, .1); }
.nav-pill__link[aria-current="page"] {
  color: var(--coral);
  background: rgba(255, 107, 74, .16);
}
.nav-pill__actions { display: none; }

/* 桌面工具区 */
.header-utility {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
}
.header-utility__link {
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: rgba(245, 240, 232, .86);
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(245, 240, 232, .34);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.header-utility__link:hover { color: var(--coral); border-color: var(--coral); }

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid rgba(245, 240, 232, .32);
  border-radius: var(--radius-pill);
  color: var(--moon);
}
.nav-toggle__label { font-size: .8rem; font-weight: 600; letter-spacing: .12em; }
.nav-toggle__bars {
  position: relative;
  display: block;
  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 .25s var(--ease), top .25s 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); }

/* 滚动进度色带 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--tide), var(--amber) 58%, var(--coral));
}

/* ==========================================================================
   页脚 · 港口夜航图
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 7vw, 96px);
  background: var(--night);
  color: rgba(245, 240, 232, .82);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--tide), var(--coral) 62%, var(--amber));
}
.footer-dock {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) var(--pad-gutter) clamp(22px, 3vw, 34px);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: clamp(26px, 3.6vw, 52px);
}
.footer-col { min-width: 0; }
.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-sans);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(217, 226, 232, .58);
}
.footer-brand__line {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--moon);
  margin-bottom: 10px;
}
.footer-brand__note {
  max-width: 36ch;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(217, 226, 232, .72);
}
.footer-stamp {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 18px;
  padding: 7px 15px;
  border: 1px solid rgba(242, 184, 75, .45);
  border-radius: var(--radius-pill);
  background: rgba(242, 184, 75, .12);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .03em;
}
.footer-stamp__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 184, 75, .18);
}
.footer-list { display: grid; gap: 11px; }
.footer-list__link {
  display: inline-block;
  font-size: .94rem;
  color: rgba(245, 240, 232, .78);
  transition: color .25s var(--ease), transform .25s var(--ease);
}
.footer-list__link:hover { color: var(--coral); transform: translateX(4px); }
.footer-list__link[aria-current="page"] { color: var(--coral); }
.footer-contact { display: grid; gap: 13px; }
.footer-contact__item {
  font-size: .92rem;
  line-height: 1.75;
  color: rgba(245, 240, 232, .82);
  overflow-wrap: anywhere;
}
.footer-contact__label {
  display: block;
  margin-bottom: 2px;
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(217, 226, 232, .52);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 20px;
  border-top: 1px solid rgba(217, 226, 232, .16);
}
.footer-record { font-size: .82rem; color: rgba(217, 226, 232, .6); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-legal__link {
  font-size: .82rem;
  color: rgba(217, 226, 232, .72);
  padding-bottom: 1px;
  border-bottom: 1px solid rgba(217, 226, 232, .26);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.footer-legal__link:hover { color: var(--coral); border-color: var(--coral); }

/* ==========================================================================
   通用布局
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--pad-gutter);
}
.section { padding-block: clamp(48px, 7vw, 104px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }
.section--sand { background: var(--sand); }
.section--deep {
  background: var(--deep-sea);
  color: rgba(245, 240, 232, .86);
}
.section--deep h2, .section--deep h3, .section--deep h4 { color: var(--moon); }
.section--deep .lede { color: rgba(217, 226, 232, .78); }
.section--night {
  background: var(--night);
  color: rgba(245, 240, 232, .86);
}
.section--night h2, .section--night h3, .section--night h4 { color: var(--moon); }

.grid { display: grid; gap: clamp(18px, 2.6vw, 32px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(236px, 1fr)); }

/* 章节色带 */
.section-band {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--mist);
}
.section-band__num {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .14em;
  color: var(--coral);
}
.section-band__title {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
}
.section-band__rule {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--mist), transparent);
}

/* 标语与导语 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--tide);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--coral);
}
.lede {
  max-width: 62ch;
  font-size: clamp(1.02rem, 1.4vw, 1.18rem);
  line-height: 1.95;
  color: var(--steel);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .04em;
  transition: transform .25s var(--ease), background-color .25s var(--ease),
              color .25s var(--ease), border-color .25s var(--ease);
}
.btn--coral { background: var(--coral); color: #fff; }
.btn--coral:hover { background: var(--coral-deep); transform: translateY(-2px); }
.btn--outline { border-color: var(--deep-sea); color: var(--deep-sea); }
.btn--outline:hover { background: var(--deep-sea); color: var(--moon); }
.btn--ghost { border-color: rgba(245, 240, 232, .38); color: var(--moon); }
.btn--ghost:hover { background: rgba(245, 240, 232, .12); }
.btn--sm { padding: 9px 16px; font-size: .85rem; }

/* 面包屑 */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .84rem;
  color: var(--steel);
}
.breadcrumbs__link {
  color: var(--tide);
  border-bottom: 1px solid rgba(30, 138, 138, .35);
}
.breadcrumbs__link:hover { color: var(--coral); border-color: var(--coral); }
.breadcrumbs__sep { color: rgba(92, 114, 133, .5); }

/* 卡片 */
.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--moon);
  border: 1px solid var(--mist);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lift);
}
.card::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(217, 226, 232, .5);
  border-radius: 8px;
  pointer-events: none;
}
.card--sand { background: var(--sand); }
.card__title {
  margin-bottom: 10px;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--deep-sea);
}
.card__title + p { font-size: .96rem; color: var(--steel); }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid currentColor;
  border-radius: var(--radius-pill);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--tide);
}
.tag--kelp { color: var(--kelp); }
.tag--amber { color: var(--amber-ink); }
.tag--coral { color: var(--coral-deep); }

/* 数据锚点 */
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--coral);
}
.section--deep .stat__num, .section--night .stat__num { color: var(--amber); }
.stat__label {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel);
}
.section--deep .stat__label, .section--night .stat__label { color: rgba(217, 226, 232, .68); }

/* 数据表格 */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--mist);
  border-radius: var(--radius-card);
  background: var(--moon);
  -webkit-overflow-scrolling: touch;
}
.data-table {
  width: 100%;
  min-width: 640px;
  font-size: 15.5px;
  line-height: 1.7;
}
.data-table th {
  padding: 13px 16px;
  background: var(--deep-sea);
  color: var(--moon);
  font-family: var(--font-sans);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  text-align: left;
  white-space: nowrap;
}
.data-table td {
  padding: 13px 16px;
  border-top: 1px solid var(--mist);
  color: var(--deep-sea);
  vertical-align: top;
}
.data-table tbody tr:hover { background: rgba(30, 138, 138, .08); }
.data-table .is-numeric {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 折叠面板 */
.panel-list { display: grid; gap: 12px; }
.panel {
  background: var(--moon);
  border: 1px solid var(--mist);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.panel__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 16px 20px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  color: var(--deep-sea);
  transition: background-color .25s var(--ease);
}
.panel__trigger:hover { background: rgba(30, 138, 138, .07); }
.panel__trigger::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--coral);
}
.panel__trigger[aria-expanded="true"]::after { content: "–"; }
.panel__content {
  padding: 0 20px 18px;
  font-size: .97rem;
  line-height: 1.9;
  color: var(--steel);
}
.panel__content[hidden] { display: none; }

/* 图像容器 */
.media { display: block; margin: 0; }
.media-frame {
  display: block;
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--mist);
  border-radius: var(--radius-card);
  background: linear-gradient(150deg, var(--deep-sea) 0%, var(--tide) 62%, var(--sand) 100%);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .22);
  pointer-events: none;
}
.media__caption {
  margin-top: 10px;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--steel);
}

/* 滚动显现 */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.has-js [data-reveal].is-in { opacity: 1; transform: none; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1120px) {
  .nav-pill__link { padding: 8px 10px; font-size: .86rem; letter-spacing: .02em; }
}

@media (max-width: 960px) {
  .site-header { padding: 8px 12px 12px; }
  .header-dock {
    flex-wrap: wrap;
    gap: 10px;
    padding: 8px 8px 8px 12px;
    border-radius: 22px;
  }
  .header-utility { display: none; }
  .nav-toggle { display: inline-flex; margin-left: auto; }

  .nav-pill {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    justify-content: flex-start;
    gap: 6px;
    padding: 14px;
    border: 1px solid rgba(217, 226, 232, .2);
    border-radius: 22px;
    background: rgba(6, 26, 43, .98);
    box-shadow: 0 30px 60px -32px rgba(6, 26, 43, .95);
  }
  .nav-pill[data-open] { display: flex; }
  .nav-pill__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    width: 100%;
  }
  .nav-pill__link {
    display: block;
    padding: 13px 14px;
    border-radius: 14px;
    border-bottom: 1px solid rgba(217, 226, 232, .12);
    font-size: 1rem;
    letter-spacing: .04em;
  }
  .nav-pill__list > li:last-child .nav-pill__link { border-bottom: 0; }
  .nav-pill__actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 8px;
    padding-top: 14px;
    border-top: 1px solid rgba(217, 226, 232, .2);
  }
  .nav-pill__actions .btn { width: 100%; padding: 12px 18px; font-size: .95rem; }
  .nav-pill__action {
    display: block;
    padding: 8px;
    text-align: center;
    font-size: .94rem;
    font-weight: 600;
    color: rgba(245, 240, 232, .86);
  }
  .nav-pill__action:hover { color: var(--coral); }

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

@media (max-width: 560px) {
  body { font-size: 16px; }
  .brand-island__tag { display: none; }
  .nav-toggle__label { display: none; }
  .footer-stamp { font-size: .74rem; }
  .card::after { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html { scroll-behavior: auto; }
  .has-js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .scroll-progress { transition: none; }
}