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

:root {
  --bg-deep: #0a0a0f;
  --bg-panel: #14141c;
  --bg-elevated: #1c1c28;
  --pink: #ff4f8b;
  --violet: #8b5cf6;
  --blue: #00d4ff;
  --amber: #ffc53d;
  --mint: #2dd4bf;
  --violet-soft: #a78bfa;
  --paper: #f5f1ed;
  --gray: #a3a3b0;
  --border: rgba(163, 163, 176, 0.18);
  --grad-main: linear-gradient(135deg, #ff4f8b 0%, #8b5cf6 100%);
  --grad-blue: linear-gradient(135deg, #00d4ff 0%, #a78bfa 100%);
  --grad-amber: linear-gradient(135deg, #ffc53d 0%, #ff4f8b 100%);
  --shadow-glow: 0 0 20px rgba(255, 79, 139, 0.35);
  --font-display: "HarmonyOS Sans SC", "Alibaba PuHuiTi 3.0", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", SFMono-Regular, Consolas, "Liberation Mono", monospace;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --nav-width: 220px;
  --ticker-height: 40px;
}

/* ========== 2. Base Typography ========== */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg-deep);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

@media (min-width: 1024px) {
  body {
    padding-left: var(--nav-width);
  }
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.2;
  color: var(--paper);
}

h1 {
  font-size: 44px;
  letter-spacing: 0.01em;
  text-shadow: 0 0 14px rgba(255, 79, 139, 0.4), 0 0 36px rgba(139, 92, 246, 0.25);
}

h2 {
  font-size: 32px;
}

h3 {
  font-size: 24px;
}

p {
  margin-bottom: 16px;
}

a {
  color: var(--pink);
  text-decoration: none;
  transition: color 0.2s, box-shadow 0.2s;
}

a:hover {
  color: var(--violet-soft);
}

ul,
ol {
  list-style: none;
}

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

/* ========== 3. 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;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 50%;
  transform: translateX(-50%) translateY(-120%);
  z-index: 999;
  background: var(--pink);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 13px;
  box-shadow: var(--shadow-glow);
  transition: transform 0.2s;
}

.skip-link:focus {
  transform: translateX(-50%) translateY(0);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ========== 4. Header · Ticker ========== */
.site-header {
  position: relative;
  z-index: 100;
}

.ticker-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 20px;
  background: linear-gradient(90deg, rgba(255, 197, 61, 0.12) 0%, rgba(255, 197, 61, 0.02) 60%, transparent 100%);
  border-bottom: 1px solid rgba(255, 197, 61, 0.25);
  font-size: 13px;
  min-height: var(--ticker-height);
  position: relative;
}

.ticker-bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--grad-amber);
}

.ticker-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid rgba(255, 197, 61, 0.4);
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  text-transform: uppercase;
  flex-shrink: 0;
}

.ticker-copy {
  color: var(--paper);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.ticker-link {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
  border: 1px solid transparent;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  flex-shrink: 0;
}

.ticker-link:hover {
  border-color: rgba(255, 197, 61, 0.5);
  color: var(--amber);
  background: rgba(255, 197, 61, 0.08);
}

/* ========== 5. Header · Shell & Brand ========== */
.header-shell {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--border);
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  text-decoration: none;
}

.brand-mark {
  width: 26px;
  height: 26px;
  background: var(--grad-main);
  border-radius: 6px;
  transform: rotate(45deg);
  box-shadow: var(--shadow-glow);
  flex-shrink: 0;
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-cn {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.brand-en {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--gray);
  text-transform: uppercase;
}

/* ========== 6. Nav Toggle ========== */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 0;
  position: relative;
  z-index: 450;
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle-line {
  height: 2px;
  background: var(--pink);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle:hover .nav-toggle-line {
  background: var(--violet-soft);
}

body[data-nav-open] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

body[data-nav-open] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

body[data-nav-open] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ========== 7. Nav · Primary ========== */
.primary-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 400;
  width: min(320px, 86vw);
  background: rgba(20, 20, 28, 0.98);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transform: translateX(-102%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  border-right: 1px solid rgba(255, 79, 139, 0.2);
}

body[data-nav-open] .primary-nav {
  transform: translateX(0);
}

body[data-nav-open]::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 15, 0.72);
  z-index: 350;
}

.primary-nav-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}

.primary-nav-title {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--gray);
  text-transform: uppercase;
}

.primary-nav-close {
  width: 34px;
  height: 34px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
}

.primary-nav-close-icon::before,
.primary-nav-close-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 14px;
  height: 2px;
  background: var(--paper);
  border-radius: 2px;
}

.primary-nav-close-icon::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.primary-nav-close-icon::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.primary-nav-close:hover {
  border-color: var(--pink);
}

.primary-nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.primary-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 10px;
  border-radius: var(--radius-md);
  color: var(--gray);
  text-decoration: none;
  transition: background 0.2s, color 0.2s, transform 0.2s;
  position: relative;
}

.primary-nav-link:hover {
  background: linear-gradient(90deg, rgba(255, 79, 139, 0.1), transparent);
  color: var(--paper);
}

.primary-nav-link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(255, 79, 139, 0.18), transparent);
  color: var(--paper);
}

.primary-nav-link[aria-current="page"] .primary-nav-index {
  color: var(--pink);
  text-shadow: 0 0 10px rgba(255, 79, 139, 0.8);
}

.primary-nav-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--violet-soft);
  width: 24px;
  flex-shrink: 0;
}

.primary-nav-copy {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
}

.primary-nav-arrow {
  margin-left: auto;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s, transform 0.2s;
  font-size: 14px;
}

.primary-nav-link:hover .primary-nav-arrow {
  opacity: 1;
  transform: translateX(0);
}

.primary-nav-foot {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gray);
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-top: 16px;
  text-align: center;
}

/* ========== 8. Scroll & BackTop ========== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--pink), var(--violet), var(--blue));
  z-index: 600;
  transition: width 0.1s linear;
  pointer-events: none;
}

.back-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 300;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(0, 212, 255, 0.5);
  background: rgba(10, 10, 15, 0.85);
  color: var(--blue);
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s, box-shadow 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-top:hover {
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.35);
}

.back-top-arrow {
  font-size: 18px;
  line-height: 1;
}

/* ========== 9. Footer ========== */
.site-footer {
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  padding: 56px 0 28px;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--pink), var(--violet), var(--blue), var(--pink));
  opacity: 0.45;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr 1.2fr;
  gap: 40px;
}

.footer-col--brand {
  border: 1px dashed rgba(255, 79, 139, 0.25);
  border-radius: var(--radius-lg);
  padding: 20px;
  background: linear-gradient(145deg, rgba(255, 79, 139, 0.04), rgba(139, 92, 246, 0.03));
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  text-decoration: none;
}

.footer-mark {
  width: 32px;
  height: 32px;
  background: var(--grad-main);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  box-shadow: var(--shadow-glow);
}

.footer-brand-text {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  color: var(--paper);
  letter-spacing: 0.05em;
}

.footer-desc {
  color: var(--gray);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 12px;
}

.footer-filing {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray);
  line-height: 1.6;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pink);
  margin-bottom: 14px;
  position: relative;
  padding-bottom: 8px;
}

.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--grad-main);
  border-radius: 2px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-links a {
  color: var(--gray);
  font-size: 14px;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
}

.footer-links a:hover {
  color: var(--paper);
  border-bottom-color: var(--pink);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.footer-contact li {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.5;
}

.footer-contact li span {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--violet-soft);
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}

.footer-contact-note {
  font-size: 13px;
  color: var(--gray);
  line-height: 1.5;
  border-left: 2px solid var(--blue);
  padding-left: 10px;
  opacity: 0.85;
}

/* ========== 10. Shared Components ========== */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.panel--glow {
  box-shadow: 0 0 24px rgba(139, 92, 246, 0.12), inset 0 0 32px rgba(0, 0, 0, 0.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.btn--primary {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 4px 18px rgba(255, 79, 139, 0.35);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(255, 79, 139, 0.5);
  color: #fff;
}

.btn--ghost {
  border-color: rgba(0, 212, 255, 0.5);
  color: var(--blue);
  background: transparent;
}

.btn--ghost:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--blue);
  color: var(--blue);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.6;
}

.tag--pink {
  color: var(--pink);
  background: rgba(255, 79, 139, 0.12);
  border: 1px solid rgba(255, 79, 139, 0.35);
}

.tag--violet {
  color: var(--violet-soft);
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.35);
}

.tag--blue {
  color: var(--blue);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.35);
}

.tag--amber {
  color: var(--amber);
  background: rgba(255, 197, 61, 0.1);
  border: 1px solid rgba(255, 197, 61, 0.4);
}

.breadcrumb {
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb-item:not(:last-child)::after {
  content: "/";
  color: var(--gray);
  font-size: 12px;
}

.breadcrumb-link {
  color: var(--gray);
}

.breadcrumb-link:hover {
  color: var(--pink);
}

.breadcrumb-current {
  color: var(--paper);
}

/* ========== 11. Media Frames ========== */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(139, 92, 246, 0.15), rgba(255, 79, 139, 0.08), rgba(0, 212, 255, 0.05));
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 160px;
}

.media-frame::before {
  content: "◆";
  font-size: 32px;
  color: rgba(255, 255, 255, 0.15);
  text-shadow: 0 0 24px rgba(255, 79, 139, 0.4);
}

.media-frame::after {
  content: "";
  position: absolute;
  top: -40%;
  left: -40%;
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08), transparent 70%);
  transform: rotate(15deg);
}

.media-frame--hero {
  min-height: 360px;
  border-radius: var(--radius-lg);
}

.media-frame--card {
  min-height: 140px;
  border-radius: var(--radius-md);
}

.media-frame--wide {
  min-height: 200px;
  width: 100%;
}

/* ========== 12. Responsive ========== */
@media (min-width: 768px) and (max-width: 1023px) {
  .header-shell {
    padding: 14px 24px;
  }

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

  .ticker-bar {
    padding: 8px 24px;
  }
}

@media (max-width: 767px) {
  .ticker-bar {
    padding: 8px 12px;
    gap: 8px;
  }

  .ticker-copy {
    font-size: 12px;
  }

  .ticker-link {
    margin-left: 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-col--brand {
    padding: 16px;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 26px;
  }

  .back-top {
    right: 12px;
    bottom: 12px;
    width: 38px;
    height: 38px;
  }
}

/* ========== 13. Desktop Side-nav ========== */
@media (min-width: 1024px) {
  .header-shell {
    justify-content: flex-end;
    padding: 16px 32px;
    background: var(--bg-deep);
    border-bottom: 1px solid var(--border);
  }

  .nav-toggle {
    display: none;
  }

  .primary-nav {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--nav-width);
    transform: none;
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    padding: 80px 16px 24px 16px;
    display: flex;
    flex-direction: column;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    z-index: 250;
  }

  .primary-nav-head,
  .primary-nav-close {
    display: none;
  }

  .primary-nav-list {
    gap: 4px;
    position: relative;
  }

  .primary-nav-list::before {
    content: "";
    position: absolute;
    left: 15px;
    top: 16px;
    bottom: 16px;
    width: 2px;
    background: linear-gradient(to bottom, var(--pink), var(--violet), var(--blue));
    opacity: 0.5;
    border-radius: 2px;
  }

  .primary-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px 10px 16px;
    border-radius: var(--radius-md);
    position: relative;
    color: var(--gray);
  }

  .primary-nav-link::before {
    content: "";
    position: absolute;
    left: -13px;
    top: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    border-radius: 50%;
    background: var(--bg-panel);
    border: 2px solid var(--violet);
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
    z-index: 1;
  }

  .primary-nav-link:hover {
    background: linear-gradient(90deg, rgba(255, 79, 139, 0.08), transparent);
    color: var(--paper);
  }

  .primary-nav-link:hover::before,
  .primary-nav-link[aria-current="page"]::before {
    background: var(--pink);
    border-color: var(--pink);
    box-shadow: 0 0 12px var(--pink);
  }

  .primary-nav-link[aria-current="page"] {
    background: linear-gradient(90deg, rgba(255, 79, 139, 0.14), transparent);
    color: var(--paper);
  }

  .primary-nav-link[aria-current="page"] .primary-nav-index {
    color: var(--pink);
    text-shadow: 0 0 8px rgba(255, 79, 139, 0.7);
  }

  .primary-nav-index {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--violet-soft);
    width: 32px;
    flex-shrink: 0;
  }

  .primary-nav-copy {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 15px;
  }

  .primary-nav-arrow {
    display: none;
  }

  .primary-nav-foot {
    display: block;
    font-size: 11px;
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    color: var(--gray);
  }

  .scroll-progress {
    left: var(--nav-width);
  }

  .site-footer {
    padding: 64px 0 32px;
  }
}

/* ========== 14. Accessibility ========== */
:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: 3px;
  border-radius: 2px;
}

.primary-nav-link:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: -2px;
}

@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: 0ms !important;
  }

  .primary-nav {
    transition: none;
  }

  .back-top {
    transition: none;
  }
}