/* ==========================================================================
   博鱼CN 共享样式表 /assets/site.css
   技术蓝图网格 + 数字水域：奶油纸底、深海蓝收口、珊瑚橙焦点
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --blue-deep: #0E3A5C;
  --blue-abyss: #082A44;
  --coral: #F2643C;
  --coral-dark: #D9522C;
  --green: #6FC7B8;
  --sand: #E0B268;
  --paper: #F8F2E7;
  --paper-alt: #EFE5D6;
  --ink: #2A2320;
  --ink-soft: #413A36;
  --muted: #66788A;
  --glass: rgba(255, 255, 255, 0.62);
  --line: rgba(14, 58, 92, 0.16);
  --line-strong: rgba(14, 58, 92, 0.30);
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 6px;
  --shadow-lift: 0 8px 24px rgba(8, 42, 68, 0.12);
  --shell: min(1180px, 100% - 40px);
  --bar-h: 68px;
}

@media (max-width: 600px) {
  :root { --shell: calc(100% - 28px); }
}

/* ---------- 2. 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(14, 58, 92, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 58, 92, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--blue-deep); text-decoration-color: rgba(242, 100, 60, 0.45); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--coral); }

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  line-height: 1.25;
  color: var(--blue-deep);
  letter-spacing: -0.01em;
  font-weight: 700;
}
h1 { font-size: clamp(28px, 5vw, 48px); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(20px, 3vw, 28px); }
h3 { font-size: 19px; }

p { margin: 0 0 1em; }
ul, ol { padding-left: 1.25em; }

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

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

#main-content { display: block; scroll-margin-top: 96px; }

/* ---------- 3. 工具类 ---------- */
.mono { font-family: var(--font-mono); }
.nowrap { white-space: nowrap; }

.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--coral);
  color: #fff;
  font-size: 14px;
  text-decoration: none;
  border-radius: 0 0 6px 6px;
  transition: top 0.16s ease;
}
.skip-link:focus { top: 0; }

.container { width: var(--shell); margin-inline: auto; }

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--alt {
  background: var(--paper-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section--deep {
  background: var(--blue-deep);
  color: rgba(255, 255, 255, 0.86);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}
.section--deep h1, .section--deep h2, .section--deep h3 { color: #fff; }
.section__head { max-width: 62ch; margin-bottom: clamp(24px, 3vw, 40px); }

.grid { display: grid; gap: clamp(20px, 3vw, 36px); }
.grid--7-5, .grid--8-4, .grid--3 { grid-template-columns: 1fr; }
@media (min-width: 900px) {
  .grid--7-5 { grid-template-columns: 7fr 5fr; }
  .grid--8-4 { grid-template-columns: 8fr 4fr; }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}

.stack > * + * { margin-top: var(--stack-gap, 16px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--coral);
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: currentColor; }

.lede { font-size: clamp(17px, 2vw, 19px); color: var(--ink-soft); max-width: 60ch; }

.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.15em; }
.prose li { margin-bottom: 0.4em; }

/* ---------- 4. 命令栏 ---------- */
.cmd-bar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--blue-deep);
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  transition: background-color 0.18s ease;
}
.cmd-bar.is-condensed { background: var(--blue-abyss); }

.cmd-bar__inner {
  width: var(--shell);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: var(--bar-h);
  padding-block: 10px;
  transition: min-height 0.18s ease;
}
.cmd-bar.is-condensed .cmd-bar__inner { min-height: 54px; padding-block: 6px; }

.cmd-bar__scale {
  position: relative;
  height: 2px;
  background: rgba(255, 255, 255, 0.14);
}
.cmd-bar__scale::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.32) 0 1px, transparent 1px 14px);
}
.cmd-bar__progress {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  background: var(--coral);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.16s linear;
}

/* 品牌铭牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: #fff;
  text-decoration: none;
}
.brand__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sand);
  border: 1px solid rgba(224, 178, 104, 0.45);
  border-radius: 3px;
  padding: 2px 6px;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-size: 17px; font-weight: 800; letter-spacing: -0.01em; }
.brand__tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--green);
}

/* 导航 */
.site-nav { flex: 1 1 auto; display: flex; justify-content: center; }
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav__item { margin: 0; }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 12px;
  border-radius: var(--radius);
  color: rgba(255, 255, 255, 0.76);
  font-size: 15px;
  line-height: 1.2;
  text-decoration: none;
  transition: color 0.16s ease, background-color 0.16s ease;
}
.site-nav__link::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(224, 178, 104, 0.7);
  transition: color 0.16s ease;
}
.site-nav__link:hover { color: #fff; background: rgba(255, 255, 255, 0.1); }
.site-nav__link:hover::before { color: var(--sand); }
.site-nav__link[aria-current="page"] { color: #fff; background: rgba(255, 255, 255, 0.13); }
.site-nav__link[aria-current="page"]::before { color: var(--coral); }
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: var(--coral);
}

/* 右侧行动区 */
.cmd-bar__actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }

.share-entry {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--green);
  text-decoration: none;
  border: 1px dashed rgba(111, 199, 184, 0.55);
  border-radius: 3px;
  padding: 6px 10px;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.share-entry:hover { background: rgba(111, 199, 184, 0.16); border-color: var(--green); color: #fff; }

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 11px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: var(--radius);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--green); color: var(--green); }
.nav-toggle__bars { display: flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.16s ease, opacity 0.16s ease;
}
.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); }

@media (max-width: 1000px) {
  .nav-toggle { display: inline-flex; order: 2; margin-left: auto; }
  .cmd-bar__actions { order: 3; }
  .site-nav {
    order: 4;
    flex: 1 0 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    justify-content: flex-start;
    transition: max-height 0.2s ease;
  }
  .site-nav[data-open="true"] { max-height: 70vh; overflow-y: auto; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 4px 0 12px;
  }
  .site-nav__link {
    width: 100%;
    padding: 12px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: 0;
    font-size: 16px;
  }
  .site-nav__link[aria-current="page"] { background: transparent; box-shadow: inset 3px 0 0 var(--coral); }
  .site-nav__link[aria-current="page"]::after { display: none; }
}

@media (max-width: 640px) {
  .share-entry { display: none; }
  .brand__tagline { letter-spacing: 0.06em; }
}
@media (max-width: 400px) {
  .brand__tagline { display: none; }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease, transform 0.14s ease;
}
.btn:active { transform: translateY(1px); }

.btn--primary { background: var(--blue-deep); color: #fff; border-color: var(--blue-deep); }
.btn--primary:hover { background: var(--blue-abyss); border-color: var(--blue-abyss); }

.cmd-bar .btn--primary { background: var(--paper); color: var(--blue-deep); border-color: var(--paper); }
.cmd-bar .btn--primary:hover { background: var(--sand); border-color: var(--sand); color: var(--blue-abyss); }

.btn--ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.42); }
.btn--ghost:hover { background: rgba(255, 255, 255, 0.12); border-color: #fff; }

.btn--quiet { background: transparent; color: var(--blue-deep); border-color: var(--line-strong); }
.btn--quiet:hover { background: var(--paper-alt); border-color: var(--blue-deep); }

/* ---------- 6. 内容组件 ---------- */
.breadcrumb { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.06em; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: var(--line-strong); }
.breadcrumb__link { color: var(--blue-deep); text-decoration: none; border-bottom: 1px solid transparent; }
.breadcrumb__link:hover { border-bottom-color: var(--coral); }
.breadcrumb__current { color: var(--muted); }

.index-strip { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.index-strip__item { border-bottom: 1px solid var(--line); margin: 0; }
.index-strip__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 4px;
  color: var(--blue-deep);
  font-weight: 600;
  text-decoration: none;
  transition: padding-left 0.16s ease, color 0.16s ease;
}
.index-strip__link:hover { padding-left: 14px; color: var(--coral); }
.index-strip__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--coral);
}
.index-strip__label { flex: 1 1 auto; }

.framed-window {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--paper);
}
.framed-window::before,
.framed-window::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--sand);
  pointer-events: none;
}
.framed-window::before { top: -2px; left: -2px; border-right: 0; border-bottom: 0; }
.framed-window::after { bottom: -2px; right: -2px; border-left: 0; border-top: 0; }
.framed-window__bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-alt);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.framed-window__coord { color: var(--blue-deep); }
.framed-window__body { padding: clamp(20px, 3vw, 40px); }

.glass-card {
  background: var(--glass);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius);
  padding: clamp(16px, 2.4vw, 24px);
  box-shadow: var(--shadow-lift);
  transition: transform 0.16s ease, background-color 0.16s ease;
}
.glass-card:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.8); }

.solid-card {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 26px);
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}
.solid-card:hover { transform: translateY(-2px); border-left-color: var(--coral); box-shadow: var(--shadow-lift); }
.solid-card__head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 8px; }
.solid-card__title { margin: 0; font-size: 18px; font-weight: 700; color: var(--blue-deep); }
.solid-card__text { margin: 0; color: var(--ink-soft); }

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--paper-alt), #E3D8C6);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(14, 58, 92, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 58, 92, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
}
.media-frame > img,
.media-frame > svg,
.media-frame > video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #fff;
  background: linear-gradient(transparent, rgba(8, 42, 68, 0.74));
}

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--blue-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 0.14s ease, color 0.14s ease, border-color 0.14s ease;
}
.chip:hover { border-color: var(--coral); color: var(--coral); }
.chip[aria-pressed="true"] { background: var(--blue-deep); border-color: var(--blue-deep); color: #fff; }

/* ---------- 7. 显现 ---------- */
[data-reveal] { transition: opacity 0.2s ease, transform 0.2s ease; }
[data-reveal].is-hidden { opacity: 0; transform: translateY(8px); }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  background-color: var(--blue-abyss);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  color: rgba(255, 255, 255, 0.78);
  border-top: 3px solid var(--coral);
}
.site-footer__inner {
  width: var(--shell);
  margin-inline: auto;
  padding-block: clamp(40px, 6vw, 72px) 32px;
}

.footer-grid { display: grid; gap: clamp(28px, 4vw, 48px); grid-template-columns: 1fr; }
@media (min-width: 820px) {
  .footer-grid { grid-template-columns: minmax(220px, 1fr) 2.6fr; }
}

.footer-brand__mark {
  display: inline-block;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #fff;
  text-decoration: none;
}
.footer-brand__mark:hover { color: var(--sand); }
.footer-brand__tagline {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--green);
}
.footer-brand__note { margin: 16px 0 0; font-size: 12px; color: rgba(255, 255, 255, 0.48); }

.footer-cols { display: grid; gap: clamp(20px, 3vw, 32px); grid-template-columns: 1fr 1fr; }
@media (min-width: 820px) {
  .footer-cols { grid-template-columns: repeat(4, 1fr); }
}
.footer-col__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--sand);
}
.footer-links { display: flex; flex-direction: column; gap: 8px; list-style: none; margin: 0; padding: 0; }
.footer-links__item { margin: 0; }
.footer-link {
  color: rgba(255, 255, 255, 0.78);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.footer-link:hover { color: #fff; border-bottom-color: var(--coral); }
.footer-links__text { font-size: 15px; color: rgba(255, 255, 255, 0.42); }

.footer-contact {
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-contact__line { margin: 0; font-size: 14px; color: rgba(255, 255, 255, 0.72); }
.footer-contact__strong { font-family: var(--font-mono); color: #fff; }

.footer-legal {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
}
.footer-legal__text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.45);
}

/* ---------- 9. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
  [data-reveal], [data-reveal].is-hidden { opacity: 1; transform: none; }
  .glass-card:hover, .solid-card:hover { transform: none; }
}