/* =========================================================
   万博最新版 / 共享样式 / site.css
   设计语言：深海数据中枢
   ========================================================= */

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

:root {
  --color-bg: #0B0A1A;
  --color-bg-deep: #060618;
  --color-primary: #1E2A5A;
  --color-primary-alt: #2E1E5E;
  --color-accent: #00E5FF;
  --color-gold: #E8C36A;
  --color-text: #C6C6D0;
  --color-text-dim: #B8B8C0;
  --color-link: #8C9EFF;
  --color-surface: #12121F;
  --color-line: rgba(140, 158, 255, 0.14);
  --color-line-accent: rgba(0, 229, 255, 0.35);
  --color-success: #4CD964;
  --color-danger: #FF6B6B;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --container-w: 1200px;
  --container-pad: 24px;
  --header-h: 72px;
  --radius-pill: 999px;
  --shadow-card: 0 24px 60px rgba(0, 0, 0, 0.35);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 2. Base ---------- */
html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(30, 42, 90, 0.28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 42, 90, 0.28) 1px, transparent 1px);
  background-size: 52px 52px;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  color: #F0F2F8;
  font-weight: 700;
  line-height: 1.2;
}

p {
  margin-bottom: 1em;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent);
}

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

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

ul, ol {
  list-style: none;
}

main {
  display: block;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

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

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

::-webkit-scrollbar-track {
  background: transparent;
}

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--color-accent);
  background: rgba(0, 229, 255, 0.06);
  padding: 2px 6px;
  border-radius: 6px;
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* ---------- 3. Layout ---------- */
.container {
  width: min(100% - (var(--container-pad) * 2), var(--container-w));
  margin-inline: auto;
}

.section {
  position: relative;
  padding: 88px 0;
}

.grid-lines {
  position: relative;
}

.grid-lines::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(140, 158, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 158, 255, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
}

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.btn--primary {
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: transparent;
  color: var(--color-accent);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.3);
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--color-line-accent);
  color: var(--color-accent);
}

.btn--ghost:hover {
  background: rgba(0, 229, 255, 0.08);
  border-color: var(--color-accent);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
}

/* ---------- 5. Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 0;
  z-index: 200;
  padding: 12px 24px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 14px;
  border-radius: 0 0 12px 0;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

/* ---------- 6. Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-top: 14px;
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 8px 8px 8px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: rgba(8, 7, 26, 0.92);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  pointer-events: auto;
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.site-header[data-scrolled] .site-header__inner {
  background: rgba(6, 6, 24, 0.97);
  border-color: var(--color-line-accent);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6), 0 0 20px rgba(0, 229, 255, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand:hover {
  color: inherit;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-accent) 0%, #6A5CFF 100%);
  color: var(--color-bg);
  font-size: 17px;
  font-weight: 800;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 68% 100%, 0 100%);
}

.brand__text {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #F0F2F8;
  white-space: nowrap;
}

.brand__text-accent {
  color: var(--color-accent);
}

.nav {
  z-index: 1;
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav__item {
  margin: 0;
}

.nav__link {
  display: block;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  color: var(--color-text-dim);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}

.nav__link:hover {
  color: var(--color-accent);
  background: rgba(0, 229, 255, 0.08);
}

.nav__link[aria-current="page"] {
  color: var(--color-accent);
  background: rgba(0, 229, 255, 0.1);
  box-shadow: inset 0 0 0 1px rgba(0, 229, 255, 0.25);
}

.header-cta {
  flex-shrink: 0;
  padding: 11px 20px;
  font-size: 13px;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 3;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--color-line);
  border-radius: 14px;
  background: rgba(0, 229, 255, 0.04);
  transition: background var(--transition), border-color var(--transition);
}

.nav-toggle:hover {
  border-color: var(--color-line-accent);
  background: rgba(0, 229, 255, 0.08);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.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);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 3;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 7. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  padding: 72px 0 28px;
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-line);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.55;
}

.site-footer__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.7fr;
  gap: 44px;
  padding-bottom: 48px;
}

.site-footer__brandblock {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
}

.site-footer__trust {
  max-width: 340px;
  margin: 0;
  font-size: 14px;
  color: var(--color-text-dim);
  line-height: 1.8;
}

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

.site-footer__heading {
  margin: 6px 0 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold);
  line-height: 1.4;
}

.footer-nav__list {
  display: grid;
  gap: 10px;
}

.footer-nav__link {
  display: inline-block;
  font-size: 14px;
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
}

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

.footer-contact {
  display: grid;
  gap: 12px;
}

.footer-contact__item {
  display: grid;
  gap: 2px;
}

.footer-contact__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-gold);
}

.footer-contact__value {
  font-size: 14px;
  color: var(--color-text);
  word-break: break-word;
}

.site-footer__bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  color: var(--color-text-dim);
}

.site-footer__copyright {
  color: var(--color-text-dim);
}

.site-footer__icp {
  color: var(--color-text-dim);
}

/* ---------- 8. Typography Components ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--color-accent);
}

.section-heading {
  margin: 0 0 12px;
  font-size: clamp(28px, 4.5vw, 48px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: #F0F2F8;
}

.section-subhead {
  max-width: 620px;
  margin: 0 0 28px;
  font-size: 16px;
  color: var(--color-text-dim);
}

.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 64px) 0 48px;
}

.page-hero__title {
  margin: 0 0 16px;
  font-size: clamp(32px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: #F0F2F8;
}

.page-hero__sub {
  max-width: 560px;
  margin: 0;
  font-size: 17px;
  color: var(--color-text-dim);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 13px;
  color: var(--color-text-dim);
}

.breadcrumb a {
  color: var(--color-link);
  text-decoration: none;
}

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

.breadcrumb__sep {
  color: var(--color-text-dim);
  opacity: 0.5;
}

.content-body {
  max-width: 720px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
}

.content-body h2 {
  margin: 42px 0 14px;
  font-size: 26px;
  color: #F0F2F8;
}

.content-body h3 {
  margin: 30px 0 10px;
  font-size: 20px;
  color: #F0F2F8;
}

.content-body p {
  margin: 0 0 18px;
}

.content-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------- 9. Components ---------- */
.card {
  position: relative;
  padding: 32px;
  background: linear-gradient(152deg, rgba(30, 42, 90, 0.7) 0%, var(--color-surface) 42%);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: var(--color-line-accent);
  transform: translateY(-4px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.4), 0 0 28px rgba(0, 229, 255, 0.06);
}

.panel {
  position: relative;
  padding: 42px;
  background: linear-gradient(140deg, rgba(46, 30, 94, 0.55) 0%, var(--color-surface) 34%);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-card);
}

.panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 26px;
  height: 26px;
  border-top: 2px solid var(--color-accent);
  border-left: 2px solid var(--color-accent);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border: 1px solid rgba(0, 229, 255, 0.22);
  border-radius: 999px;
  background: rgba(0, 229, 255, 0.06);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  line-height: 1.4;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
  vertical-align: middle;
}

.image-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  background:
    radial-gradient(ellipse at 70% 20%, rgba(30, 42, 90, 0.6), transparent 70%),
    var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
  isolation: isolate;
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.05) 1px, transparent 1px);
  background-size: 26px 26px;
}

.image-frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 40%;
  background: linear-gradient(135deg, transparent 50%, rgba(0, 229, 255, 0.12) 50%);
}

/* ---------- 10. Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal="in"] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 11. Responsive ---------- */
@media (min-width: 1025px) and (max-width: 1199px) {
  .site-header__inner {
    gap: 12px;
    padding-left: 12px;
  }

  .brand__mark {
    width: 38px;
    height: 38px;
  }

  .brand__text {
    font-size: 17px;
  }

  .nav__link {
    padding: 9px 13px;
    font-size: 13px;
  }

  .header-cta {
    padding: 10px 16px;
    font-size: 13px;
  }
}

@media (max-width: 1024px) {
  .header-cta {
    display: none;
  }

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

  .site-header__inner {
    justify-content: space-between;
  }

  .nav {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: min(420px, 100%);
    display: flex;
    align-items: stretch;
    padding: 20px;
    background: rgba(6, 6, 24, 0.98);
    border: 1px solid var(--color-line-accent);
    border-radius: 20px;
    box-shadow: var(--shadow-card);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition), transform var(--transition), visibility 0s linear 0.25s;
  }

  .nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity var(--transition), transform var(--transition), visibility 0s linear 0s;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    width: 100%;
  }

  .nav__link {
    padding: 14px 16px;
    font-size: 15px;
    border-radius: 12px;
  }
}

@media (max-width: 900px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .site-footer__brandblock {
    grid-column: 1 / -1;
  }
}

@media (max-width: 700px) {
  .site-footer {
    margin-top: 64px;
    padding-top: 48px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .site-footer__brandblock {
    grid-column: auto;
  }

  .site-footer__bottom {
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  .site-header__inner {
    gap: 10px;
    padding: 6px 6px 6px 10px;
  }

  .brand__mark {
    width: 36px;
    height: 36px;
    font-size: 15px;
  }

  .brand__text {
    font-size: 17px;
  }

  .nav-toggle {
    width: 38px;
    height: 38px;
  }
}

/* ---------- 12. Reduced Motion ---------- */
@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;
    transition-delay: 0s !important;
    scroll-behavior: auto !important;
  }

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