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

/* ========== Design Tokens ========== */
:root {
  color-scheme: dark;
  --color-bg: #0a0e17;
  --color-bg-alt: #121826;
  --color-bg-card: #1a1f2e;
  --color-accent: #00d4ff;
  --color-accent-alt: #39ff88;
  --color-gold: #ffc94d;
  --color-text: #f2f5f7;
  --color-text-dim: #a0a8b4;
  --color-border: #2a3344;
  --color-danger: #ff6b6b;
  --font-headline: "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
  --font-body: "Inter", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-data: "Roboto Mono", "SFMono-Regular", "Consolas", monospace;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --container-max: 1200px;
  --header-z: 100;
  --page-progress-z: 200;
  --skip-z: 9999;
}

/* ========== Base ========== */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(ellipse 60% 40% at 85% -10%, rgba(0, 212, 255, 0.06), transparent 60%),
    radial-gradient(ellipse 50% 40% at 0% 110%, rgba(57, 255, 136, 0.04), transparent 60%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-headline);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1.2;
  text-wrap: balance;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: var(--space-4); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); margin-bottom: var(--space-3); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); margin-bottom: var(--space-2); }
h4 { font-size: 1.05rem; margin-bottom: var(--space-2); }

p { margin-bottom: 1em; }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover { text-decoration: underline; }

ul, ol { padding-left: 1.4em; }

::selection {
  background: rgba(0, 212, 255, 0.32);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

code, .data-font {
  font-family: var(--font-data);
}

/* ========== Utilities ========== */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  width: 100%;
}

.section {
  padding-top: var(--space-7);
  padding-bottom: var(--space-7);
}

.section--tight {
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-accent);
}

.rule {
  border: 0;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-6) 0;
}

/* ========== Skip Link ========== */
.skip-link {
  position: fixed;
  top: 0;
  left: var(--space-3);
  z-index: var(--skip-z);
  padding: var(--space-2) var(--space-3);
  background: var(--color-accent);
  color: #06121a;
  font-family: var(--font-headline);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  color: #06121a;
  text-decoration: none;
}

/* ========== Scroll Progress ========== */
.page-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: var(--page-progress-z);
  pointer-events: none;
  background: transparent;
}

.page-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.45);
  transition: width 0.08s linear;
}

/* ========== Header ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--header-z);
  background: rgba(10, 14, 23, 0.9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.site-header__top {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.site-header__top-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-1) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 34px;
}

.site-header__slogan {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__main {
  border-bottom: 1px solid var(--color-border);
}

.site-header__main-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  text-decoration: none;
}

.brand:hover { text-decoration: none; }

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-accent), #00799b);
  color: #06121a;
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.03em;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.3);
  flex-shrink: 0;
}

.brand__text {
  display: block;
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--color-text);
  white-space: nowrap;
  transition: color 0.15s ease;
}

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

.brand__sub {
  display: block;
  font-weight: 400;
  font-size: 0.68rem;
  color: var(--color-text-dim);
  letter-spacing: 0.1em;
}

/* Status Pill */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--color-text-dim);
  white-space: nowrap;
}

.status-pill--live { border-color: rgba(57, 255, 136, 0.35); }

.status-pill__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent-alt);
  box-shadow: 0 0 8px var(--color-accent-alt);
  animation: signal-pulse 2s ease-in-out infinite;
}

@keyframes signal-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.7); }
}

.status-pill__text { color: var(--color-text); }

/* Navigation */
.site-nav { flex-shrink: 0; }

.site-nav__list {
  display: flex;
  list-style: none;
  padding: 0;
  gap: 2px;
  align-items: center;
}

.site-nav__link {
  display: inline-block;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-headline);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-dim);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.site-nav__link:hover {
  color: var(--color-text);
  background: rgba(0, 212, 255, 0.07);
  text-decoration: none;
}

.site-nav__link[aria-current="page"] {
  color: var(--color-accent);
  background: rgba(0, 212, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.2);
}

/* Nav Toggle */
.site-nav__toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.site-nav__toggle:hover {
  border-color: var(--color-accent);
  background: rgba(0, 212, 255, 0.06);
}

.site-nav__toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text);
  transition: transform 0.25s ease, opacity 0.25s ease, background-color 0.15s ease;
}

.site-nav__toggle:hover .site-nav__toggle-bar { background: var(--color-accent); }

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

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

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

/* ========== Footer ========== */
.site-footer {
  position: relative;
  margin-top: var(--space-8);
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-alt) 70%, transparent 100%);
  opacity: 0.45;
  pointer-events: none;
}

.site-footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-5);
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr 1.2fr;
  gap: var(--space-5);
  align-items: start;
}

.site-footer__brand-col { max-width: 340px; }

.site-footer__brand {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.site-footer__trust {
  font-size: 0.85rem;
  color: var(--color-text-dim);
  line-height: 1.7;
  margin: 0;
}

.site-footer__heading {
  font-family: var(--font-headline);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: var(--space-3);
}

.site-footer__links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.site-footer__link {
  font-size: 0.88rem;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.15s ease, padding-left 0.15s ease;
}

.site-footer__link:hover {
  color: var(--color-accent);
  padding-left: 4px;
  text-decoration: none;
}

.site-footer__contact {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-dim);
  line-height: 1.9;
  margin: 0;
}

.site-footer__contact:first-of-type { color: var(--color-text); font-weight: 500; }

.site-footer__note {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-4);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  border-top: 1px solid transparent;
}

.site-footer__meta {
  border-top: 1px solid var(--color-border);
  padding: var(--space-3) 0;
}

.site-footer__meta-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  font-size: 0.75rem;
  color: var(--color-text-dim);
  font-family: var(--font-data);
}

.site-footer__meta-inner p { margin: 0; }

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-headline);
  font-weight: 600;
  font-size: 0.92rem;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.btn:hover { text-decoration: none; }

.btn--primary {
  background: var(--color-accent);
  color: #06121a;
}

.btn--primary:hover {
  background: #33dcff;
  box-shadow: 0 4px 22px rgba(0, 212, 255, 0.3);
  transform: translateY(-1px);
}

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

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* ========== Breadcrumb ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: var(--space-4) 0 var(--space-3);
  gap: 0;
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--color-border);
  font-family: var(--font-data);
}

.breadcrumb a {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* ========== Page Hero ========== */
.page-hero {
  position: relative;
  padding-top: var(--space-7);
  padding-bottom: var(--space-6);
  overflow: hidden;
}

.page-hero__headline {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  max-width: 11em;
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.page-hero__intro {
  font-size: 1.05rem;
  color: var(--color-text-dim);
  max-width: 40em;
  line-height: 1.8;
  margin-bottom: var(--space-5);
}

.page-hero__data {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* ========== Data Board ========== */
.data-board {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

/* ========== Metric ========== */
.metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 90px;
}

.metric__value {
  font-family: var(--font-data);
  font-weight: 500;
  font-size: 2rem;
  line-height: 1.1;
  color: var(--color-accent);
}

.metric__label {
  font-family: var(--font-headline);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-text-dim);
}

/* ========== Data Grid ========== */
.data-grid {
  display: flex;
  flex-direction: column;
  font-family: var(--font-data);
  font-size: 0.88rem;
}

.data-grid__row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3) 0;
  border-bottom: 1px dashed var(--color-border);
}

.data-grid__row:last-child { border-bottom: 0; }

/* ========== Image Frame ========== */
.image-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(0, 212, 255, 0.06), transparent 60%),
    var(--color-bg-alt);
  border: 1px solid var(--color-border);
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 3px,
    rgba(0, 212, 255, 0.025) 3px,
    rgba(0, 212, 255, 0.025) 4px
  );
  opacity: 0.5;
  pointer-events: none;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 40%, rgba(0, 212, 255, 0.1), transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(57, 255, 136, 0.05), transparent 40%);
  pointer-events: none;
}

.image-frame--ratio-16x9 { aspect-ratio: 16 / 9; }
.image-frame--ratio-4x3 { aspect-ratio: 4 / 3; }
.image-frame--ratio-1x1 { aspect-ratio: 1 / 1; }

/* ========== Sheet / Accordion ========== */
.sheet {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.sheet.is-open { border-color: rgba(0, 212, 255, 0.25); }

.sheet__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-4);
  background: transparent;
  border: none;
  color: var(--color-text);
  font-family: var(--font-headline);
  font-weight: 600;
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.sheet__trigger:hover {
  color: var(--color-accent);
  background: rgba(0, 212, 255, 0.04);
}

.sheet__trigger::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 1.2rem;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.22s ease;
}

.sheet.is-open .sheet__trigger::after { transform: rotate(45deg); }

.sheet__content {
  max-height: 0;
  padding: 0 var(--space-4);
  overflow: hidden;
  color: var(--color-text-dim);
  font-size: 0.92rem;
  line-height: 1.7;
  transition: max-height 0.25s ease, padding 0.25s ease;
}

.sheet.is-open .sheet__content {
  max-height: 640px;
  padding: 0 var(--space-4) var(--space-4);
}

/* ========== Hero Deco ========== */
.hero-deco {
  position: absolute;
  pointer-events: none;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.09), rgba(57, 255, 136, 0.04));
  border: 1px solid rgba(0, 212, 255, 0.14);
  transform-origin: center;
}

/* ========== Responsive: Tablet ========== */
@media (max-width: 1023px) {
  .site-nav__link {
    padding-left: 10px;
    padding-right: 10px;
    font-size: 0.84rem;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

/* ========== Responsive: Mobile Nav ========== */
@media (max-width: 879px) {
  .site-nav__toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 18px 36px rgba(0, 0, 0, 0.4);
    padding: var(--space-3) var(--space-4) var(--space-4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__link {
    display: block;
    width: 100%;
    padding: 13px 16px;
    font-size: 0.98rem;
    border-radius: var(--radius-md);
  }
}

/* ========== Responsive: Mobile Layout ========== */
@media (max-width: 559px) {
  .site-header__top-inner {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .site-header__main-inner {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
    min-height: 64px;
  }

  .brand__mark {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
    border-radius: 10px;
  }

  .brand__text {
    font-size: 1.05rem;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding-top: var(--space-5);
  }

  .site-footer__meta-inner {
    flex-direction: column;
    gap: var(--space-2);
  }

  .page-hero__data {
    gap: var(--space-4);
  }

  .container {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }
}

@media (max-width: 419px) {
  .site-header__slogan {
    max-width: 140px;
  }
}

/* ========== 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;
  }

  .site-nav {
    transition: none;
  }
}