/* ============================================================
   宝威赛场 · 共享样式表 /assets/site.css
   1. Reset  2. Tokens  3. Base type  4. Utilities
   5. Header  6. Footer  7. Motion  8. Responsive
   ============================================================ */

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

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

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

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

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

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

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

input, textarea, select { font: inherit; }

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

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0B1B33;
  --ink-deep: #07101F;
  --panel: #13345C;
  --signal: #FF6A2B;
  --volt: #B6FF3B;
  --paper: #F4E9D4;
  --paper-ink: #241A14;
  --white: #FFFFFF;
  --mist: #9DB0C8;
  --ember: #C43E1C;

  --line: rgba(157, 176, 200, 0.24);
  --line-soft: rgba(157, 176, 200, 0.14);
  --line-strong: rgba(157, 176, 200, 0.46);

  --r-lg: 28px;
  --r-md: 18px;
  --r-pill: 999px;

  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 64px;

  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "STSong", Georgia, serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Courier New", monospace;
}

@media (min-width: 900px) {
  :root { --header-h: 76px; }
}

/* ---------- 3. Base type ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--white);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 82% -8%, rgba(19, 52, 92, 0.92), rgba(11, 27, 51, 0) 68%),
    radial-gradient(880px 520px at -12% 108%, rgba(255, 106, 43, 0.10), rgba(11, 27, 51, 0) 62%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

/* ---------- 4. Utilities ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

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

.grid-auto {
  display: grid;
  gap: clamp(14px, 2.4vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(22px, 4vw, 38px);
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--signal);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  transition: transform 0.18s ease, background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--signal {
  background: var(--signal);
  color: var(--ink-deep);
  box-shadow: 0 14px 28px -18px rgba(255, 106, 43, 0.95);
}
.btn--signal:hover { background: #ff8149; }

.btn--volt {
  background: var(--volt);
  color: var(--ink-deep);
}
.btn--volt:hover { background: #caff6c; }

.btn--ghost {
  background: transparent;
  color: var(--white);
  border-color: var(--line-strong);
}
.btn--ghost:hover {
  color: var(--volt);
  border-color: var(--volt);
}

.btn--paper {
  background: var(--paper);
  color: var(--paper-ink);
}
.btn--paper:hover { background: #fff6e4; }

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.tag--live {
  color: var(--volt);
  border-color: rgba(182, 255, 59, 0.45);
  background: rgba(182, 255, 59, 0.08);
}
.tag--signal {
  color: var(--ink-deep);
  background: var(--signal);
  border-color: var(--signal);
  font-weight: 700;
}

/* Panel */
.panel {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: clamp(18px, 3vw, 28px);
  background: linear-gradient(170deg, rgba(19, 52, 92, 0.72), rgba(7, 16, 31, 0.66));
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb li + li::before {
  content: "/";
  color: rgba(157, 176, 200, 0.45);
}
.breadcrumb a {
  color: var(--mist);
  transition: color 0.18s ease;
}
.breadcrumb a:hover { color: var(--volt); }
.breadcrumb [aria-current="page"] { color: var(--white); }

/* Prose */
.prose {
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.86);
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.35;
  margin-top: 2em;
  color: var(--white);
}
.prose h3 {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  margin-top: 1.6em;
  color: var(--white);
}
.prose ul { padding-left: 0; }
.prose li {
  position: relative;
  padding-left: 20px;
  margin-top: 0.4em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 8px;
  height: 2px;
  background: var(--signal);
}
.prose strong { color: var(--white); }
.prose--paper { color: var(--paper-ink); }
.prose--paper h2,
.prose--paper h3,
.prose--paper strong { color: var(--paper-ink); }
.prose--paper li::before { background: var(--ember); }

/* Image frame (placeholder-first) */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  aspect-ratio: 4 / 3;
  background:
    repeating-linear-gradient(135deg, rgba(157, 176, 200, 0.09) 0 2px, transparent 2px 14px),
    linear-gradient(150deg, var(--panel) 0%, var(--ink-deep) 68%);
}
.img-frame > img,
.img-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.img-frame--wide { aspect-ratio: 16 / 9; }
.img-frame--tall { aspect-ratio: 3 / 4; }
.img-frame--square { aspect-ratio: 1 / 1; }
.img-frame__tag {
  position: absolute;
  left: 16px;
  bottom: 16px;
  z-index: 2;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  background: rgba(7, 16, 31, 0.82);
  color: var(--volt);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

/* ---------- 5. Header ---------- */
.skip-link {
  position: absolute;
  left: 50%;
  top: 10px;
  z-index: 200;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  background: var(--volt);
  color: var(--ink-deep);
  font-size: 14px;
  font-weight: 700;
  transform: translate(-50%, -180%);
  transition: transform 0.2s ease;
}
.skip-link:focus { transform: translate(-50%, 0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(7, 16, 31, 0.97) 0%, rgba(11, 27, 51, 0.94) 100%);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 24px 50px -42px rgba(0, 0, 0, 0.95);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    var(--signal) 0 18%,
    var(--volt) 18% 25%,
    rgba(196, 62, 28, 0.9) 25% 29%,
    transparent 29% 100%
  );
}

.header__frame {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 24px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  min-height: var(--header-h);
  padding: 10px var(--gutter);
  box-shadow: inset 1px 0 0 var(--line-soft), inset -1px 0 0 var(--line-soft);
}
.header__frame::before,
.header__frame::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, var(--line-strong), transparent);
}
.header__frame::before { left: 0; }
.header__frame::after { right: 0; }

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 0 1 auto;
}
.brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(150deg, var(--signal), var(--ember));
  color: var(--ink-deep);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  box-shadow: 0 12px 26px -14px rgba(255, 106, 43, 0.95);
}
.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}
.brand__name {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--white);
  white-space: nowrap;
}
.brand__line {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(19, 52, 92, 0.55);
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}
.nav-toggle:hover { background: var(--panel); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 12px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--volt);
  transition: transform 0.2s ease, opacity 0.2s 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);
}

/* Nav — mobile panel by default */
.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  display: none;
  padding: 6px var(--gutter) 22px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-deep), #050d19);
  box-shadow: 0 40px 70px -40px #000;
  max-height: calc(100vh - var(--header-h));
  max-height: calc(100dvh - var(--header-h));
  overflow-y: auto;
  overscroll-behavior: contain;
}
.site-nav[data-open] { display: block; }

.site-nav__list {
  display: flex;
  flex-direction: column;
}
.site-nav__item { border-bottom: 1px solid var(--line); }
.site-nav__link {
  display: block;
  padding: 15px 2px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.86);
  transition: color 0.18s ease;
}
.site-nav__link:hover { color: var(--volt); }
.site-nav__link[aria-current="page"] { color: var(--volt); }

.header__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.header__actions .btn { flex: 1 1 140px; }

@media (max-width: 899px) {
  .header__actions .btn--ghost { display: inline-flex; }
}

/* Scroll meter */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(157, 176, 200, 0.14);
}
.scroll-meter__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--signal), var(--volt));
  transition: transform 0.12s linear;
}

/* ---------- 6. Footer ---------- */
.site-footer {
  position: relative;
  background: var(--ink-deep);
  color: rgba(255, 255, 255, 0.78);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--volt) 0 10%, var(--signal) 10% 26%, transparent 26% 100%);
}

.footer__frame {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(36px, 6vw, 64px) var(--gutter) 26px;
}

.footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.footer__brand {
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 27px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--white);
}
.footer__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid rgba(182, 255, 59, 0.4);
  border-radius: var(--r-pill);
  color: var(--volt);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}
.footer__badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--volt);
  box-shadow: 0 0 0 4px rgba(182, 255, 59, 0.14);
}

.footer__cols {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(26px, 4vw, 40px) 0;
  grid-template-columns: 1fr;
}
.footer__col { min-width: 0; }
.footer__col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.footer__links a {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer__links a:hover {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 14px;
}
.footer__contact-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  word-break: break-word;
}
.footer__contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.footer__note {
  margin-top: 6px;
  padding-left: 12px;
  border-left: 2px solid var(--signal);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--mist);
}
.footer__copy { font-family: var(--font-mono); letter-spacing: 0.04em; }
.footer__icp { font-family: var(--font-mono); letter-spacing: 0.04em; }

/* ---------- 7. Motion ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.55s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.has-js [data-reveal="shown"] {
  opacity: 1;
  transform: none;
}

/* ---------- 8. Responsive ---------- */
@media (max-width: 560px) {
  .brand__line { display: none; }
  .brand__mark { width: 34px; height: 34px; font-size: 18px; }
}

@media (max-width: 899px) {
  body { background-attachment: scroll; }
}

@media (min-width: 640px) {
  .footer__cols { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: clamp(10px, 1.8vw, 26px);
    margin-left: auto;
    padding: 0;
    border: 0;
    background: none;
    box-shadow: none;
    max-height: none;
    overflow: visible;
  }
  .site-nav__list {
    flex-direction: row;
    align-items: center;
    gap: 2px;
  }
  .site-nav__item { border: 0; }
  .site-nav__link {
    padding: 8px 12px;
    border-radius: var(--r-pill);
    font-size: 14px;
    white-space: nowrap;
    transition: color 0.18s ease, background-color 0.18s ease;
  }
  .site-nav__link:hover {
    color: var(--white);
    background: var(--panel);
  }
  .site-nav__link[aria-current="page"] {
    color: var(--ink-deep);
    background: var(--volt);
  }
  .site-nav__link[aria-current="page"]:hover {
    color: var(--ink-deep);
    background: var(--volt);
  }

  .header__actions {
    margin-top: 0;
    flex-wrap: nowrap;
  }
  .header__actions .btn {
    flex: 0 0 auto;
    padding: 9px 16px;
    font-size: 13px;
    white-space: nowrap;
  }
}

@media (min-width: 900px) and (max-width: 1199px) {
  .brand__line { display: none; }
  .site-nav__link { padding: 8px 9px; font-size: 13px; }
  .header__actions .btn { padding: 8px 13px; font-size: 12.5px; }
  .header__actions .btn--ghost { display: none; }
}

@media (min-width: 960px) {
  .footer__cols { grid-template-columns: 1.1fr 0.9fr 1.6fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .btn:hover { transform: none; }
  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}