/* ============================================================
   博鱼品牌站 · 共享样式 /assets/site.css
   罗盘刻度导航 + 坐标网格主题
   ============================================================ */

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

body, h1, h2, h3, h4, p, figure, blockquote, ol, ul, dl, dd { margin: 0; }
ol, ul { list-style: none; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: transparent; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #061A2B;
  --ink-2: #0E2C44;
  --grid: #1E4A6B;
  --cyan: #3FF0C0;
  --orange: #FF8A3D;
  --paper: #F4EEE2;
  --paper-2: #E9E1D1;
  --mist: #7FA0B5;
  --paper-gray: #C3BAA9;
  --vermilion: #E2553C;
  --signal: #FFD166;

  --line: rgba(30, 74, 107, 0.95);
  --line-soft: rgba(30, 74, 107, 0.5);

  --rail-w: 104px;
  --masthead-h: 68px;
  --page-max: 1180px;
  --gutter: clamp(18px, 4vw, 44px);

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

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 220ms;
  --dur-slow: 520ms;
}

@media (max-width: 1023px) {
  :root { --rail-w: 88px; --masthead-h: 64px; }
}

@media (max-width: 899px) {
  :root { --rail-w: 0px; --masthead-h: 58px; }
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.75;
  padding-top: var(--masthead-h);
  padding-left: var(--rail-w);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1 { font: 900 clamp(32px, 5vw, 58px) / 1.07 var(--font-display); letter-spacing: -0.02em; color: var(--paper); }
h2 { font: 900 clamp(24px, 3.2vw, 34px) / 1.2 var(--font-display); letter-spacing: -0.012em; color: var(--paper); }
h3 { font: 800 clamp(18px, 2vw, 21px) / 1.4 var(--font-display); color: var(--paper); }
h4 { font: 800 16px / 1.5 var(--font-display); color: var(--paper); }

p { overflow-wrap: break-word; }

strong { font-weight: 700; }

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

#main-content { scroll-margin-top: calc(var(--masthead-h) + 12px); }

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

/* ---------- 4. Utility ---------- */
.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: 10px;
  left: calc(var(--rail-w) + 14px);
  z-index: 120;
  transform: translateY(-180%);
  padding: 11px 18px;
  background: var(--cyan);
  color: var(--ink);
  font: 700 14px / 1 var(--font-body);
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. Layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 820px; }

.section { padding-block: clamp(40px, 7vw, 88px); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.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)); }

@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 6. Typography ---------- */
.eyebrow {
  display: inline-block;
  font: 700 11.5px / 1.5 var(--font-mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.display {
  font: 900 clamp(34px, 5.4vw, 62px) / 1.06 var(--font-display);
  letter-spacing: -0.022em;
  color: var(--paper);
}

.h2 { font: 900 clamp(24px, 3.2vw, 34px) / 1.2 var(--font-display); letter-spacing: -0.012em; color: var(--paper); }
.h3 { font: 800 clamp(18px, 2vw, 21px) / 1.38 var(--font-display); color: var(--paper); }

.lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
}

.prose {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}
.prose p + p { margin-top: 1.1em; }
.prose strong { color: var(--paper); }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(63, 240, 192, 0.4); }
.prose a:hover { border-bottom-color: var(--cyan); }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.dim { color: var(--mist); }

/* ---------- 7. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  font: 700 13.5px / 1 var(--font-body);
  letter-spacing: 0.06em;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.btn:active { transform: translateY(1px); }

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

.btn--ghost { border-color: var(--grid); color: var(--paper); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--warm { background: var(--orange); border-color: var(--orange); color: var(--ink); }
.btn--warm:hover { background: transparent; color: var(--orange); }

.btn--block { width: 100%; }

/* ---------- 8. Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font: 700 11px / 1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--grid);
  color: var(--mist);
  border-radius: 2px;
}
.tag--cyan { border-color: var(--cyan); color: var(--cyan); }
.tag--warm { border-color: var(--orange); color: var(--orange); }
.tag--signal { background: var(--signal); border-color: var(--signal); color: var(--ink); }
.tag--alert { background: var(--vermilion); border-color: var(--vermilion); color: var(--paper); }

/* ---------- 9. Panels ---------- */
.panel {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: clamp(20px, 3vw, 32px);
}

.paper-card {
  background: var(--paper);
  border: 1px solid var(--paper-gray);
  border-radius: 2px;
  color: var(--ink);
  padding: clamp(20px, 3vw, 34px);
}
.paper-card .h2, .paper-card .h3 { color: var(--ink); }
.paper-card .lede, .paper-card .prose { color: var(--ink-2); }
.paper-card .eyebrow { color: var(--vermilion); }

/* ---------- 10. Media placeholders ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
  background:
    radial-gradient(circle at 50% 42%, rgba(63, 240, 192, 0.09), transparent 62%),
    linear-gradient(180deg, rgba(30, 74, 107, 0.55), rgba(6, 26, 43, 0.94)),
    var(--ink-2);
}
.media::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 74, 107, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 74, 107, 0.5) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}
.media::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed rgba(63, 240, 192, 0.22);
  pointer-events: none;
}
.media > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

@media (max-width: 600px) {
  .media--wide { aspect-ratio: 16 / 9; }
}

/* ---------- 11. Breadcrumb ---------- */
.breadcrumb { margin-bottom: 20px; }
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font: 600 12px / 1.5 var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--mist);
}
.breadcrumb li + li::before { content: "/"; color: var(--grid); }
.breadcrumb a { transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

/* ---------- 12. Header ---------- */
.site-header {
  position: fixed;
  inset: 0;
  z-index: 80;
  pointer-events: none;
}

.masthead,
.compass-nav,
.nav-scrim,
.nav-toggle,
.skip-link { pointer-events: auto; }

.nav-scrim { pointer-events: none; }
.nav-scrim[data-visible] { pointer-events: auto; }

/* --- masthead --- */
.masthead {
  position: absolute;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: var(--masthead-h);
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
  padding-inline: var(--gutter);
  background: rgba(6, 26, 43, 0.9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  min-width: 0;
}
.brand__mark {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  color: var(--cyan);
}
.brand__mark svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
}
.brand__needle { fill: var(--orange); stroke: none; }
.brand__text { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.brand__name { font: 900 19px / 1 var(--font-display); letter-spacing: 0.05em; color: var(--paper); }
.brand__line {
  font: 600 10.5px / 1 var(--font-body);
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
}

.masthead__utility {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.masthead__utility strong { color: var(--cyan); font-weight: 700; }

.masthead__actions { display: flex; gap: 10px; flex: 0 0 auto; }

/* --- nav toggle --- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(14, 44, 68, 0.72);
  color: var(--paper);
  font: 700 13px / 1 var(--font-body);
  letter-spacing: 0.06em;
}
.nav-toggle__bars { display: flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__label { white-space: nowrap; }

/* --- compass rail --- */
.compass-nav {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  background: var(--ink-2);
  border-right: 1px solid var(--line);
}

.compass-nav__cap {
  flex: 0 0 auto;
  height: var(--masthead-h);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  border-bottom: 1px solid var(--line);
  background:
    repeating-linear-gradient(90deg, rgba(30, 74, 107, 0.65) 0 1px, transparent 1px 11px);
}
.compass-nav__cap svg {
  width: 34px;
  height: 34px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.3;
  opacity: 0.9;
}

.compass-nav__scale {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 20px 0 26px;
}

.compass-nav__item { flex: 0 0 auto; }

.compass-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  padding: 15px 4px 15px 6px;
  border-left: 2px solid transparent;
  color: var(--mist);
  transition: color var(--dur) var(--ease),
              background var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.compass-nav__link:hover,
.compass-nav__link:focus-visible { color: var(--paper); background: rgba(63, 240, 192, 0.06); }
.compass-nav__link[aria-current="page"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(63, 240, 192, 0.1);
}

.compass-nav__tick {
  font: 600 10px / 1 var(--font-mono);
  letter-spacing: 0.14em;
  color: var(--grid);
  transition: color var(--dur) var(--ease);
}
.compass-nav__link:hover .compass-nav__tick { color: var(--orange); }
.compass-nav__link[aria-current="page"] .compass-nav__tick { color: var(--cyan); }

.compass-nav__label {
  writing-mode: vertical-rl;
  font: 800 13px / 1 var(--font-body);
  letter-spacing: 0.2em;
}

.compass-nav__hint {
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  z-index: 90;
  width: 186px;
  padding: 10px 12px;
  background: var(--paper);
  color: var(--ink);
  font: 600 12.5px / 1.55 var(--font-body);
  letter-spacing: 0.02em;
  border-left: 3px solid var(--orange);
  border-radius: 2px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-8px, -50%);
  transition: opacity var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              visibility var(--dur);
}
.compass-nav__link:hover .compass-nav__hint,
.compass-nav__link:focus-visible .compass-nav__hint {
  opacity: 1;
  visibility: visible;
  transform: translate(0, -50%);
}

/* --- scrim --- */
.nav-scrim {
  position: fixed;
  top: var(--masthead-h);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 65;
  background: rgba(6, 26, 43, 0.68);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.nav-scrim[data-visible] { opacity: 1; }

/* --- header responsive --- */
@media (max-width: 1180px) {
  .masthead__utility { display: none; }
}

@media (max-width: 1023px) {
  .masthead__actions .btn { padding: 10px 13px; font-size: 12.5px; }
}

@media (max-width: 899px) {
  .masthead__actions { display: none; }
  .nav-toggle { display: inline-flex; }

  .compass-nav {
    position: fixed;
    top: var(--masthead-h);
    left: auto;
    right: 0;
    bottom: 0;
    width: min(320px, 86vw);
    border-right: 0;
    border-left: 1px solid var(--line);
    transform: translateX(102%);
    visibility: hidden;
    overflow-y: auto;
    z-index: 95;
    transition: transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
  }
  .compass-nav[data-open] { transform: translateX(0); visibility: visible; }

  .compass-nav__cap { display: none; }

  .compass-nav__scale { padding: 14px 0 26px; gap: 0; }

  .compass-nav__link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    padding: 16px 20px;
  }
  .compass-nav__label { writing-mode: horizontal-tb; font-size: 15px; letter-spacing: 0.06em; }
  .compass-nav__tick { font-size: 11px; }
  .compass-nav__hint { display: none; }
}

@media (max-width: 480px) {
  .brand__line { display: none; }
  .brand__mark { width: 32px; height: 32px; }
  .brand__name { font-size: 17px; }
}

/* ---------- 13. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  padding-top: clamp(34px, 5vw, 60px);
  background: var(--paper);
  color: var(--ink);
  border-top: 3px solid var(--ink);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 24px);
  opacity: 0.28;
  pointer-events: none;
}

.site-footer :focus-visible { outline-color: var(--ink); }

.site-footer__inner {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: clamp(26px, 4vw, 64px);
}

.site-footer__brand { min-width: 0; }

.footer-logo {
  font: 900 clamp(28px, 3.6vw, 40px) / 1 var(--font-display);
  letter-spacing: -0.02em;
  color: var(--ink);
}
.footer-note {
  margin-top: 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(14, 44, 68, 0.78);
  max-width: 34ch;
}
.footer-stamp {
  display: inline-block;
  margin-top: 18px;
  padding: 6px 10px;
  font: 700 11.5px / 1 var(--font-mono);
  letter-spacing: 0.18em;
  color: var(--vermilion);
  border: 1px solid var(--vermilion);
  border-radius: 2px;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 36px);
}

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

.footer-col__title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  font: 700 11.5px / 1.3 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--paper-gray);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink-2);
  transition: color var(--dur) var(--ease);
}
.footer-col__list a::before {
  content: "";
  width: 6px;
  height: 1px;
  background: var(--orange);
  transition: width var(--dur) var(--ease);
}
.footer-col__list a:hover { color: var(--ink); }
.footer-col__list a:hover::before { width: 15px; }

.site-footer__base {
  margin-top: clamp(30px, 4vw, 52px);
  background: var(--paper-2);
  border-top: 1px solid var(--paper-gray);
  padding-block: 22px;
}

.site-footer__base-inner {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 28px;
}

.footer-contact {
  font: 600 13px / 1.7 var(--font-mono);
  color: var(--ink-2);
}
.footer-legal {
  font: 700 12.5px / 1.7 var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--ink);
}
.footer-copy {
  font: 600 12.5px / 1.7 var(--font-mono);
  color: rgba(14, 44, 68, 0.7);
}
.footer-footnote {
  flex: 1 1 100%;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(14, 44, 68, 0.72);
}

@media (max-width: 860px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
}

@media (max-width: 480px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 14. Reveal / motion ---------- */
.js-reveal [data-reveal] {
  transition: opacity var(--dur-slow) var(--ease),
              transform var(--dur-slow) var(--ease);
}
.js-reveal [data-reveal]:not(.is-visible) {
  opacity: 0;
  transform: translateY(16px);
}
.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .masthead::after { transition: none; }
}