/* ============================================================
   Deng Fei — Legal Pages Stylesheet
   Privacy Policy, Terms of Service
   ============================================================ */

/* --- Root Variables (mirror style.css) --- */
:root {
  --color-base: #171A26;
  --color-darker: #0F1119;
  --color-surface: #20242F;
  --color-surface-light: #2A2E3D;
  --color-primary: #0EA5E9;
  --color-primary-bright: #22D3EE;
  --color-accent: #F87171;
  --color-accent-soft: #FB7185;
  --color-text: #F4F6F9;
  --color-muted: #98A2B3;
  --color-border: rgba(244, 246, 249, 0.08);
  --color-border-strong: rgba(244, 246, 249, 0.14);
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.45);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.55);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-base);
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #171A26;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
}

.logo-mark {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-bright));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #FFFFFF;
  box-shadow: 0 0 16px rgba(14, 165, 233, 0.3);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text);
  background: rgba(244, 246, 249, 0.04);
}

/* --- Mobile Toggle --- */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  z-index: 1001;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
  transform-origin: center;
}

.mobile-toggle.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-toggle.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ============================================================
   PAGE HERO (Banner)
   ============================================================ */
.page-hero {
  background: var(--color-base);
  border-bottom: 1px solid var(--color-border);
  padding: 4rem 2rem;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.page-hero h1 span {
  color: var(--color-primary-bright);
}

.page-hero .effective-date {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-muted);
  margin-top: 0.5rem;
  letter-spacing: 0.03em;
}

/* ============================================================
   POLICY CONTENT CARD
   ============================================================ */
.policy-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 3.5rem 3rem;
  background: #F4F6F9;
  border: 1px solid #20242F;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.policy-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-darker);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-bright);
  letter-spacing: -0.01em;
}

.policy-content h2:first-of-type {
  margin-top: 0;
}

.policy-content p {
  font-size: 1rem;
  color: #20242F;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.policy-content p strong {
  color: var(--color-darker);
  font-weight: 600;
}

.policy-content ul {
  list-style: none;
  margin-bottom: 1.25rem;
  margin-left: 0.5rem;
}

.policy-content ul li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.6rem;
  font-size: 1rem;
  color: #20242F;
  line-height: 1.75;
}

.policy-content ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 7px;
  height: 7px;
  background: var(--color-primary-bright);
  border-radius: 50%;
}

.policy-content a {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.policy-content a:hover {
  color: var(--color-primary-bright);
}

.policy-content .section-hint {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-top: -0.5rem;
  margin-bottom: 1.25rem;
}

/* ============================================================
   WRAPPER (spacing around the card)
   ============================================================ */
.legal-wrapper {
  padding: 3rem 2rem 5rem;
  background: var(--color-base);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--color-darker);
  border-top: 1px solid var(--color-border);
  padding: 5rem 0 0;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--color-border);
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.footer-logo .logo-mark {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-bright));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #FFFFFF;
  box-shadow: 0 0 16px rgba(14, 165, 233, 0.3);
}

.footer-logo .logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.footer-heading {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-muted);
  transition: all var(--transition-fast);
  padding: 0.2rem 0;
}

.footer-links a:hover {
  color: var(--color-primary-bright);
  padding-left: 0.3rem;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-muted);
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-2px);
}

/* --- Footer Bottom --- */
.footer-bottom {
  padding: 1.75rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  font-size: 0.85rem;
  color: var(--color-muted);
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: var(--color-primary-bright);
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 880px) {
  .mobile-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 5rem 1.5rem 2rem;
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 1000;
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .nav-link {
    width: 100%;
    font-size: 1.05rem;
    padding: 0.75rem 1rem;
  }

  .page-hero h1 {
    font-size: 2rem;
  }

  .policy-content {
    padding: 2rem 1.5rem;
  }

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

@media (max-width: 640px) {
  br {
    display: none;
  }

  .page-hero {
    padding: 2.5rem 1.25rem;
  }

  .page-hero h1 {
    font-size: 1.6rem;
  }

  .legal-wrapper {
    padding: 2rem 0 3rem;
  }

  .policy-content {
    padding: 1.75rem 1.25rem;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  .policy-content h2 {
    font-size: 1.3rem;
  }

  .nav-container {
    padding: 0 1.25rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}