/* ==========================================================================
   99真人娱乐 · 共享站点样式 /assets/site.css
   夜间矿物场 × 纸本索引 · 导航构成页面外框
   ========================================================================== */

:root {
  --ink: #07110E;
  --deep: #0E2B24;
  --moss: #1C4438;
  --moss-light: #2E5A4A;
  --gold: #D8B15C;
  --gold-light: #F0D9A6;
  --coral: #FF6B4A;
  --coral-hover: #FF8763;
  --paper: #F4EBD8;
  --rock: #C9C2B2;
  --clay: #B5643C;

  --line: rgba(216, 177, 92, 0.24);
  --line-strong: rgba(216, 177, 92, 0.52);
  --text-soft: rgba(244, 235, 216, 0.82);
  --text-dim: rgba(201, 194, 178, 0.72);

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: clamp(20px, 5vw, 80px);
  --width: 1320px;
  --gap: clamp(16px, 2vw, 32px);
  --radius: 2px;
  --ease: 160ms ease-out;
}

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

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

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

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

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

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

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

hr { border: 0; }

/* ---------- base ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 18px);
  line-height: 1.75;
  color: var(--paper);
  background-color: #0B211B;
  background-image:
    radial-gradient(1100px 620px at 10% -12%, rgba(46, 90, 74, 0.55), transparent 68%),
    radial-gradient(900px 520px at 92% 4%, rgba(28, 68, 56, 0.62), transparent 70%),
    linear-gradient(180deg, #0E2B24 0%, #0B211B 48%, #07110E 100%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.02em;
}

p { max-width: 68ch; }

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

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

/* ---------- utilities ---------- */
.container {
  width: 100%;
  max-width: var(--width);
  margin-inline: auto;
  padding-inline: var(--shell);
}

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

.label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.stack {
  display: grid;
  gap: var(--stack-gap, 20px);
}

.rule {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), rgba(216, 177, 92, 0));
}

.lead {
  font-size: clamp(17px, 1.45vw, 20px);
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 36em;
}

.note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--rock);
  border-left: 2px solid var(--clay);
  padding-left: 14px;
  max-width: 46ch;
}

.index-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(181, 100, 60, 0.16);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold-light);
  white-space: nowrap;
}

/* ---------- grid ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(28, 68, 56, 0.55);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
}

.btn:hover {
  background: rgba(46, 90, 74, 0.9);
  border-color: var(--gold);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--coral);
  border-color: var(--coral);
  color: #1A0A06;
  font-weight: 600;
}

.btn--primary:hover {
  background: var(--coral-hover);
  border-color: var(--coral-hover);
  color: #160805;
}

.btn--ghost {
  background: transparent;
  color: var(--paper);
}

/* ---------- breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px dashed rgba(216, 177, 92, 0.22);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.breadcrumb-link {
  color: var(--gold-light);
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease), color var(--ease);
}

.breadcrumb-link:hover {
  color: #FFFFFF;
  border-bottom-color: var(--gold);
}

.breadcrumb-sep { color: var(--clay); }

/* ---------- section heading ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--clay);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 40px);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

/* ---------- surfaces ---------- */
.paper-card {
  background: var(--paper);
  color: var(--deep);
  border: 1px solid rgba(7, 17, 14, 0.16);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 28px);
  box-shadow: 0 1px 0 rgba(244, 235, 216, 0.14), 0 18px 32px -24px rgba(0, 0, 0, 0.85);
  transition: transform var(--ease), box-shadow var(--ease);
}

.paper-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 1px 0 rgba(244, 235, 216, 0.22), 0 26px 42px -26px rgba(0, 0, 0, 0.95);
}

.data-panel {
  background: linear-gradient(180deg, rgba(28, 68, 56, 0.94), rgba(14, 43, 36, 0.94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(16px, 2vw, 24px);
}

/* ---------- visual frame (reusable media container) ---------- */
.visual-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 28% 22%, rgba(46, 90, 74, 0.9), transparent 62%),
    radial-gradient(circle at 80% 78%, rgba(255, 107, 74, 0.24), transparent 56%),
    linear-gradient(150deg, #0E2B24 0%, #07110E 74%);
}

.visual-frame--wide { aspect-ratio: 21 / 9; }
.visual-frame--tall { aspect-ratio: 3 / 4; }
.visual-frame--square { aspect-ratio: 1 / 1; }

.visual-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(216, 177, 92, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(216, 177, 92, 0.14) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.65;
  pointer-events: none;
}

.visual-frame img,
.visual-frame svg {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.visual-frame__caption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(7, 17, 14, 0.78);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-light);
}

/* ---------- timeline ---------- */
.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  position: relative;
  padding-left: 22px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 3px rgba(255, 107, 74, 0.18);
}

.timeline-mark {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 10px 16px;
  border: 2px solid var(--coral);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  transform: translateY(-180%);
  transition: transform var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ==========================================================================
   头部 —— 两段式框线导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(7, 17, 14, 0.98) 0%, rgba(11, 33, 27, 0.95) 100%);
  border-bottom: 1px solid var(--line-strong);
  backdrop-filter: blur(8px);
}

.header-frame {
  width: 100%;
  max-width: var(--width);
  margin-inline: auto;
  padding-inline: var(--shell);
}

.header-rail {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding-block: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
}

.brand-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--gold);
  background: linear-gradient(160deg, rgba(216, 177, 92, 0.18), rgba(216, 177, 92, 0));
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: background var(--ease), color var(--ease);
}

.brand:hover .brand-mark {
  background: var(--gold);
  color: var(--ink);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.22;
}

.brand-name {
  font-family: var(--font-display);
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.header-action { margin-left: auto; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(28, 68, 56, 0.55);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.nav-toggle:hover {
  background: rgba(46, 90, 74, 0.9);
  border-color: var(--gold);
  color: #FFFFFF;
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform var(--ease), top var(--ease), bottom var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  bottom: 4px;
  transform: rotate(-45deg);
}

.nav-toggle-text { line-height: 1; }

.site-nav {
  border-top: 1px solid var(--line);
}

.nav-list {
  display: flex;
  align-items: stretch;
}

.nav-item {
  flex: 1 1 auto;
  border-left: 1px solid var(--line);
}

.nav-item:last-child { border-right: 1px solid var(--line); }

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 11px clamp(10px, 1.4vw, 20px);
  font-size: 14px;
  color: var(--text-soft);
  transition: background var(--ease), color var(--ease), box-shadow var(--ease);
}

.nav-index {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--clay);
  transition: color var(--ease);
}

.nav-label { font-weight: 500; }

.nav-link:hover {
  background: rgba(46, 90, 74, 0.62);
  color: var(--gold-light);
}

.nav-link:hover .nav-index { color: var(--gold); }

.nav-link[aria-current="page"] {
  background: rgba(216, 177, 92, 0.14);
  color: var(--gold-light);
  box-shadow: inset 0 -2px 0 var(--coral);
}

.nav-link[aria-current="page"] .nav-index { color: var(--coral); }

/* ==========================================================================
   页脚 —— 印刷版权页层次
   ========================================================================== */
.site-footer {
  margin-top: clamp(56px, 9vw, 120px);
  background: linear-gradient(180deg, #0B211B 0%, #07110E 58%, #050C0A 100%);
  border-top: 1px solid var(--line-strong);
}

.footer-frame {
  width: 100%;
  max-width: var(--width);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 64px) var(--shell) 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.9fr);
  gap: clamp(28px, 5vw, 72px);
  padding-bottom: clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-mark {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.footer-brand-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 30ch;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

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

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  width: fit-content;
  font-size: 15px;
  color: var(--text-soft);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.footer-link:hover {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px clamp(20px, 3vw, 40px);
  padding: clamp(22px, 3vw, 34px) 0;
  border-bottom: 1px solid var(--line);
}

.footer-contact-line {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.footer-contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 20px;
}

.footer-legal-line {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.footer-year {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.footer-note {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 62ch;
}

/* ==========================================================================
   显现（渐进增强，无 JS 时内容照常可见）
   ========================================================================== */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 520ms ease-out, transform 520ms ease-out;
}

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

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-brand-note { max-width: 46ch; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    border-top: 1px solid var(--line-strong);
    background: linear-gradient(180deg, rgba(7, 17, 14, 0.99) 0%, rgba(14, 43, 36, 0.99) 100%);
    box-shadow: 0 24px 40px -28px rgba(0, 0, 0, 0.95);
  }

  .site-nav[data-open="true"] { display: block; }

  .nav-list { flex-direction: column; }

  .nav-item {
    flex: 0 0 auto;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .nav-item:last-child {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .nav-link {
    padding: 15px 4px;
    font-size: 16px;
  }

  .nav-link[aria-current="page"] {
    box-shadow: inset 3px 0 0 var(--coral);
  }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

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

@media (max-width: 640px) {
  .header-action { display: none; }

  .brand-mark { width: 40px; height: 40px; font-size: 17px; }

  .brand-tagline { display: none; }

  .grid-12 { grid-template-columns: minmax(0, 1fr); }

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

  .footer-contact { grid-template-columns: minmax(0, 1fr); }

  .footer-legal { justify-content: flex-start; }

  p { max-width: 100%; }
}

@media (max-width: 380px) {
  .nav-toggle-text { display: none; }
}

/* ==========================================================================
   动效偏好
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn:hover,
  .paper-card:hover {
    transform: none;
  }
}