/* =====================================================================
   8868娱乐 · Site Kit 共享样式
   文件：/assets/site.css
   角色：reset / 变量 / 中文排版 / 头部页脚 / 按钮 / 面包屑 /
        正文容器 / 栅格 / 基础组件 / 滚动显现 / 移动端适配
   ===================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #E6F1FF;
  background-color: #0A192F;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: #FF6B35;
  text-decoration: none;
  transition: color 0.25s ease;
}

a:hover {
  color: #00C9A7;
}

ul,
ol {
  list-style: none;
}

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

input {
  font: inherit;
}

:focus-visible {
  outline: 2px solid #00C9A7;
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 2. Design Tokens ---------- */
:root {
  --font-heading: "Montserrat", "Helvetica Neue", "Arial",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", "Segoe UI", sans-serif;
  --font-data: "Roboto Mono", "SF Mono", "Consolas",
    "Liberation Mono", monospace;

  --color-bg: #0A192F;
  --color-bg-panel: #112240;
  --color-text: #E6F1FF;
  --color-muted: #8892B0;
  --color-accent: #FF6B35;
  --color-data: #00C9A7;
  --color-light: #F8FAFC;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-hover: #112240;
  --color-error: #E11D48;
  --color-warning: #F59E0B;

  --container-width: 1200px;
  --radius-pill: 999px;
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 6px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 3. Base Typography ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

p {
  margin-bottom: 1em;
}

strong {
  color: var(--color-text);
}

::selection {
  background: rgba(255, 107, 53, 0.3);
  color: var(--color-text);
}

/* ---------- 4. Utilities ---------- */
.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;
}

[data-hidden] {
  display: none !important;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: clamp(48px, 8vw, 96px);
}

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--color-data);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-index::after {
  content: "";
  flex: 0 0 64px;
  height: 1px;
  background: var(--color-border);
}

.display-heading {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(36px, 6vw, 72px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.2;
  margin-bottom: 16px;
}

.page-heading {
  padding: 64px 0 32px;
}

.page-intro {
  max-width: 640px;
  font-size: 18px;
  color: var(--color-muted);
  line-height: 1.7;
}

.body-text {
  max-width: 720px;
}

.body-text p {
  margin-bottom: 1.2em;
  color: rgba(230, 241, 255, 0.82);
}

/* ---------- 5. Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 24px;
  z-index: 3000;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  transition: top 0.3s var(--ease-out);
}

.skip-link:focus {
  top: 16px;
}

/* ---------- 6. Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 2000;
  background: linear-gradient(90deg, var(--color-accent), var(--color-data));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 7. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 12px 12px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  min-height: 56px;
  padding: 6px 6px 6px 20px;
  background: rgba(10, 25, 47, 0.88);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  box-shadow:
    0 4px 18px rgba(0, 0, 0, 0.45),
    0 0 60px rgba(0, 201, 167, 0.05);
  transition: background-color 0.3s, border-color 0.3s;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  white-space: nowrap;
}

.site-brand:hover {
  color: var(--color-text);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #FF6B35, #FF8E5E);
  color: #0A192F;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  flex-shrink: 0;
}

.brand-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.brand-live {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-data);
  animation: pulse-ring 2s infinite;
  flex-shrink: 0;
}

@keyframes pulse-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 201, 167, 0.55);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(0, 201, 167, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(0, 201, 167, 0);
  }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.nav-link {
  display: inline-block;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  transition: background-color 0.25s, color 0.25s;
}

.nav-link:hover {
  background: var(--color-hover);
  color: var(--color-data);
}

.nav-link[aria-current="page"] {
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.search-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-muted);
  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}

.search-toggle:hover {
  color: var(--color-data);
  background: rgba(0, 201, 167, 0.08);
  border-color: rgba(0, 201, 167, 0.3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.04);
  gap: 5px;
  transition: border-color 0.2s, background-color 0.2s;
}

.nav-toggle:hover {
  border-color: var(--color-data);
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text);
  transition: transform 0.3s var(--ease-out), opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 8. Search Dropdown ---------- */
.header-search {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) scale(0.98);
  transform-origin: top center;
  width: min(560px, calc(100vw - 24px));
  background: rgba(17, 34, 64, 0.97);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55);
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 1001;
  transition: opacity 0.25s, transform 0.25s var(--ease-out), visibility 0.25s;
}

.header-search[data-open] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) scale(1);
}

.search-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 15px;
  transition: border-color 0.2s;
}

.search-input::placeholder {
  color: var(--color-muted);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-data);
}

.search-hint {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* ---------- 9. Footer ---------- */
.site-footer {
  margin-top: 80px;
  padding: 80px 0 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-accent) 20%,
    var(--color-data) 50%,
    var(--color-accent) 80%,
    transparent
  );
  opacity: 0.35;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--color-border);
}

.footer-brand {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 28px;
  letter-spacing: 0.02em;
  color: var(--color-text);
  margin-bottom: 10px;
}

.footer-brand:hover {
  color: var(--color-text);
}

.footer-slogan {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.footer-trust {
  max-width: 340px;
  padding-left: 16px;
  border-left: 2px solid var(--color-accent);
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.65;
}

.footer-heading {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 14px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  font-size: 14px;
  color: var(--color-muted);
  transition: color 0.2s, padding-left 0.2s;
}

.footer-link:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

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

.footer-contact {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.55;
  word-break: break-all;
}

.footer-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-block: 24px;
}

.copyright,
.icp {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--color-muted);
}

.footer-wordmark {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(100px, 18vw, 260px);
  line-height: 0.72;
  text-align: center;
  color: rgba(255, 255, 255, 0.035);
  user-select: none;
  pointer-events: none;
  letter-spacing: 0.05em;
  transform: translateY(18%);
}

/* ---------- 10. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.25s, color 0.25s,
    border-color 0.25s, box-shadow 0.25s, transform 0.25s var(--ease-out);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 28px rgba(255, 107, 53, 0.25);
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  color: var(--color-data);
  border-color: var(--color-data);
  transform: translateY(-2px);
}

/* ---------- 11. Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 14px;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-muted);
  transition: color 0.2s;
}

.breadcrumb a:hover {
  color: var(--color-data);
}

.breadcrumb-sep {
  font-family: var(--font-data);
  color: var(--color-border);
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

/* ---------- 12. Grids ---------- */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

/* ---------- 13. Cards ---------- */
.card {
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform 0.35s var(--ease-out), border-color 0.35s;
}

.card:hover {
  border-color: rgba(255, 107, 53, 0.4);
  transform: translateY(-4px);
}

.card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 8px;
}

.card-text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ---------- 14. Tags ---------- */
.tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-data);
  background: rgba(0, 201, 167, 0.08);
  border: 1px solid rgba(0, 201, 167, 0.25);
  transition: background-color 0.2s, color 0.2s;
}

.tag:hover {
  background: rgba(0, 201, 167, 0.15);
  color: var(--color-text);
}

/* ---------- 15. Media Frame ---------- */
.media-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(
    135deg,
    rgba(17, 34, 64, 0.9),
    rgba(10, 25, 47, 0.98)
  );
  border: 1px solid var(--color-border);
  aspect-ratio: 16 / 9;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 23px, rgba(255, 255, 255, 0.04) 24px, transparent 25px),
    linear-gradient(transparent 23px, rgba(255, 255, 255, 0.04) 24px, transparent 25px);
  background-size: 48px 48px;
  z-index: 1;
  pointer-events: none;
}

/* ---------- 16. Stats ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
}

.stat-value {
  font-family: var(--font-data);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
  color: var(--color-data);
  line-height: 1.1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  text-transform: uppercase;
}

/* ---------- 17. Timeline ---------- */
.timeline {
  position: relative;
  padding-left: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 8px;
  left: 6px;
  width: 1px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 28px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 8px;
  left: -24px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 1px rgba(255, 107, 53, 0.4);
}

.timeline-meta {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--color-data);
  margin-bottom: 4px;
}

.timeline-title {
  font-weight: 700;
  font-size: 16px;
  color: var(--color-text);
  margin-bottom: 4px;
}

.timeline-text {
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------- 18. Reveal Motion ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

html.js [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 19. Responsive ---------- */
@media (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 960px) {
  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 12px;
    right: 12px;
    z-index: 999;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: rgba(17, 34, 64, 0.98);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity 0.3s var(--ease-out),
      transform 0.3s var(--ease-out), visibility 0.3s;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-link {
    display: block;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 16px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-inner {
    padding: 6px 8px 6px 16px;
  }

  .split-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-heading {
    padding: 48px 0 24px;
  }

  .container {
    padding-inline: 20px;
  }
}

@media (max-width: 480px) {
  .brand-text {
    font-size: 16px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    font-size: 18px;
    border-radius: 8px;
  }

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

  .search-hint {
    font-size: 11px;
  }

  .footer-brand {
    font-size: 24px;
  }
}

/* ---------- 20. Accessibility Overrides ---------- */
@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;
  }

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

  .brand-live {
    animation: none;
  }
}