:root {
  --color-primary: #0265c2;
  --color-primary-dark: #024f99;
  --color-primary-light: #e8f2fd;
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;
  --color-success-bg: #f0fdf4;
  --color-success-border: #bbf7d0;

  --color-checker-a: #f1f5f9;
  --color-checker-b: transparent;
  --color-ink-fixed: #0f172a;
  --color-ink-fixed-text: #ffffff;
  --color-badge-bg: #fff8f0;
  --color-glass-bg: rgba(255, 255, 255, 0.85);
  --color-glass-bg-strong: rgba(255, 255, 255, 0.96);

  --accent-coral: #ff6b45;
  --accent-yellow: #ffd23f;
  --font-display: 'Caveat', cursive;

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 24px;

  --shadow-soft: 0 1px 2px rgba(2, 101, 194, 0.04), 0 8px 20px rgba(15, 23, 42, 0.05), 0 20px 40px -12px rgba(2, 101, 194, 0.10);
  --shadow-hover: 0 2px 6px rgba(2, 101, 194, 0.10), 0 16px 32px -8px rgba(2, 101, 194, 0.22), 0 28px 56px -16px rgba(2, 101, 194, 0.18);
  --shadow-glow: 0 0 0 1px rgba(2, 101, 194, 0.08), 0 0 24px rgba(2, 101, 194, 0.18);

  --transition-base: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #3b93e0;
    --color-primary-dark: #63a9e6;
    --color-primary-light: #102c47;
    --color-bg: #0b1220;
    --color-bg-soft: #131c2e;
    --color-surface: #17233a;
    --color-text: #eef2f8;
    --color-text-muted: #93a2ba;
    --color-border: #263352;
    --color-checker-a: #1e2a42;
    --color-checker-b: transparent;
    --color-badge-bg: #2a1f14;
    --color-glass-bg: rgba(11, 18, 32, 0.85);
    --color-glass-bg-strong: rgba(11, 18, 32, 0.96);
    --color-danger-bg: #2a1315;
    --color-danger-border: #5c2328;
    --color-success-bg: #12261a;
    --color-success-border: #1f4a30;

    --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.2), 0 8px 20px rgba(0, 0, 0, 0.25), 0 20px 40px -12px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 2px 6px rgba(0, 0, 0, 0.25), 0 16px 32px -8px rgba(0, 0, 0, 0.4), 0 28px 56px -16px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 0 1px rgba(59, 147, 224, 0.18), 0 0 24px rgba(59, 147, 224, 0.28);

    color-scheme: dark;
  }
}

[data-theme="dark"] {
  --color-primary: #3b93e0;
  --color-primary-dark: #63a9e6;
  --color-primary-light: #102c47;
  --color-bg: #0b1220;
  --color-bg-soft: #131c2e;
  --color-surface: #17233a;
  --color-text: #eef2f8;
  --color-text-muted: #93a2ba;
  --color-border: #263352;
  --color-checker-a: #1e2a42;
  --color-checker-b: transparent;
  --color-badge-bg: #2a1f14;
  --color-glass-bg: rgba(11, 18, 32, 0.85);
  --color-glass-bg-strong: rgba(11, 18, 32, 0.96);
  --color-danger-bg: #2a1315;
  --color-danger-border: #5c2328;
  --color-success-bg: #12261a;
  --color-success-border: #1f4a30;

  --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.2), 0 8px 20px rgba(0, 0, 0, 0.25), 0 20px 40px -12px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 2px 6px rgba(0, 0, 0, 0.25), 0 16px 32px -8px rgba(0, 0, 0, 0.4), 0 28px 56px -16px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 0 1px rgba(59, 147, 224, 0.18), 0 0 24px rgba(59, 147, 224, 0.28);

  color-scheme: dark;
}

* {
  box-sizing: border-box;
  transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

@view-transition {
  navigation: auto;
}

html, body {
  overflow-x: hidden;
  max-width: 100%;
}

html { scroll-behavior: smooth; }

::selection { background: var(--color-primary); color: #fff; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 999px; border: 2px solid var(--color-bg); }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }
html { scrollbar-color: var(--color-border) transparent; scrollbar-width: thin; }

body {
  margin: 0;
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.icon {
  display: inline-block;
  vertical-align: -0.15em;
  flex-shrink: 0;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-light), 0 0 0 5px rgba(2, 101, 194, 0.35);
  border-radius: var(--radius-sm);
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-glass-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
}

.logo {
  display: flex;
  align-items: center;
}
.logo-img {
  height: 32px;
  width: auto;
  display: block;
}
.logo-img-dark { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-img-light { display: none; }
  :root:not([data-theme="light"]) .logo-img-dark { display: block; }
}

[data-theme="dark"] .logo-img-light { display: none; }
[data-theme="dark"] .logo-img-dark { display: block; }

.verified-badge-inline {
  display: inline-flex;
  vertical-align: -2px;
  margin-left: 4px;
  color: #0265c2;
}
.verified-badge-inline .icon { width: 14px; height: 14px; }

.mobile-tabbar {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 90;
  background: var(--color-glass-bg-strong);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom, 0px));
  justify-content: space-around;
  align-items: center;
  box-shadow: 0 -2px 12px rgba(15,23,42,0.05);
}

.mobile-tabbar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 0.66rem;
  font-weight: 600;
  transition: var(--transition-base);
}
.mobile-tabbar-item .icon { width: 21px; height: 21px; }
.mobile-tabbar-item.is-active { color: var(--color-primary); }
.mobile-tabbar-avatar {
  width: 21px; height: 21px; border-radius: 50%; object-fit: cover;
}
.mobile-tabbar-item.is-active .mobile-tabbar-avatar { box-shadow: 0 0 0 2px var(--color-primary); }

.nav-links a.nav-links-profile-row, .nav-links a.nav-links-mobile-login-only { display: none; }
.nav-theme-toggle-mobile-only { display: none; }

@media (min-width: 769px) and (max-width: 1140px) {
  .nav-links { gap: 0; }
  .nav-links a { padding: 10px; }
  .nav-links a span { display: none; }
  .user-chip span { display: none; }
  .user-chip { padding: 6px; }
  .navbar-inner { padding-left: 16px; padding-right: 16px; }
}

@media (max-width: 768px) {
  .mobile-tabbar { display: flex; }
  body { padding-bottom: 62px; }

  .theme-toggle-desktop { display: none; }
  .user-chip-desktop-only { display: none; }
  .nav-cta-login-desktop-only { display: none; }

  .nav-theme-toggle-mobile-only {
    display: block;
    padding: 12px 14px 4px;
    border-top: 1px solid var(--color-border);
    margin-top: 6px;
  }
  .nav-theme-toggle-mobile-only .theme-toggle { width: 100%; justify-content: center; }

  .nav-links a.nav-links-profile-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    margin-bottom: 8px;
    border-radius: var(--radius-md);
    background: var(--color-primary-light);
  }
  .nav-links-profile-avatar { width: 42px; height: 42px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
  .nav-links-profile-info { display: flex; flex-direction: column; min-width: 0; }
  .nav-links-profile-info strong { font-size: 0.92rem; color: var(--color-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .nav-links-profile-info em { font-style: normal; font-size: 0.78rem; color: var(--color-text-muted); }

  .nav-links a.nav-links-mobile-login-only {
    display: flex;
    background: var(--color-primary);
    color: #fff !important;
    justify-content: center;
    margin-bottom: 4px;
  }
  .nav-links-mobile-login-only:hover { background: var(--color-primary-dark); color: #fff; }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 8px 12px;
  border-radius: 999px;
  transition: var(--transition-base);
}
.nav-links a .icon { width: 16px; height: 16px; flex-shrink: 0; }
.nav-links a:hover { color: var(--color-primary); background: var(--color-primary-light); }
.nav-links a.is-active { color: var(--color-primary); background: var(--color-primary-light); font-weight: 600; }

.nav-cta { display: flex; align-items: center; gap: 12px; }

.nav-search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--color-bg-soft);
  color: var(--color-text-muted);
  transition: var(--transition-base);
}
.nav-search-btn .icon { width: 17px; height: 17px; }
.nav-search-btn:hover { background: var(--color-primary-light); color: var(--color-primary); }

.theme-toggle {
  display: inline-flex;
  background: var(--color-bg-soft);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
}
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: var(--transition-base);
}
.theme-toggle-btn .icon { width: 15px; height: 15px; }
.theme-toggle-btn:hover { color: var(--color-primary); }
.theme-toggle-btn.is-active { background: var(--color-surface); color: var(--color-primary); box-shadow: var(--shadow-soft); }

.user-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 6px;
  border-radius: 999px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  transition: var(--transition-base);
}
.user-chip:hover { box-shadow: var(--shadow-soft); border-color: var(--color-primary); transform: translateY(-1px); }
.user-chip img {
  width: 30px; height: 30px; border-radius: 50%; object-fit: cover;
}
.user-chip span { font-size: 0.9rem; font-weight: 600; }

.mobile-menu-btn {
  display: none;
  position: relative;
  width: 38px; height: 38px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}
.mobile-menu-btn svg { position: absolute; transition: opacity 0.2s ease, transform 0.2s ease; }
.menu-icon-close { opacity: 0; transform: rotate(-45deg) scale(0.7); }
.mobile-menu-btn[aria-expanded="true"] .menu-icon-open { opacity: 0; transform: rotate(45deg) scale(0.7); }
.mobile-menu-btn[aria-expanded="true"] .menu-icon-close { opacity: 1; transform: rotate(0) scale(1); }

.mobile-menu-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  z-index: 98;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.mobile-menu-backdrop.is-visible { display: block; opacity: 1; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.35s var(--ease-spring), box-shadow 0.3s var(--ease-smooth), background 0.2s ease;
  white-space: nowrap;
  position: relative;
  isolation: isolate;
}
.btn:active { transform: scale(0.96); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.22) 45%, rgba(255,255,255,0.22) 50%, transparent 65%);
  transform: translateX(-100%);
  transition: transform 0.6s var(--ease-smooth);
  z-index: -1;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}
.btn-primary:hover::before { transform: translateX(100%); }

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-ghost {
  background: var(--color-bg-soft);
  color: var(--color-text);
}
.btn-ghost:hover { background: var(--color-border); transform: translateY(-1px); }

.btn-block { width: 100%; }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; border-radius: var(--radius-sm); }

@media (prefers-reduced-motion: reduce) {
  .btn, .btn-primary::before { transition: none !important; }
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  transition: transform 0.4s var(--ease-spring), box-shadow 0.35s var(--ease-smooth), border-color 0.3s ease;
  position: relative;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: rgba(2, 101, 194, 0.2); }

.card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(220px circle at var(--spot-x, 50%) var(--spot-y, 50%), rgba(2, 101, 194, 0.08), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.card:hover::after { opacity: 1; }

.form-group { margin-bottom: 18px; }

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition-base);
  background: var(--color-bg-soft);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 4px var(--color-primary-light);
}

textarea.form-control { resize: vertical; min-height: 100px; }

.form-hint { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 6px; }
.form-error {
  background: var(--color-danger-bg);
  border: 1px solid var(--color-danger-border);
  color: var(--color-danger);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 16px;
}
.form-success {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
  color: var(--color-success);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
}

.hero {
  padding: 100px 24px 80px;
  text-align: center;
  background:
    radial-gradient(circle at 15% 20%, rgba(2, 101, 194, 0.06), transparent 40%),
    radial-gradient(circle at 85% 10%, rgba(2, 101, 194, 0.05), transparent 35%),
    var(--color-bg-soft);
}

.hero-badge {
  margin: 0 auto 20px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}

.hero h1 .highlight { color: var(--color-primary); }

.hero p.subtitle {
  max-width: 560px;
  margin: 0 auto 40px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.claim-handle {
  max-width: 520px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 6px 6px 6px 20px;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-base);
}
.claim-handle:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 5px var(--color-primary-light);
}

.claim-prefix {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  white-space: nowrap;
}

.claim-handle input {
  flex: 1;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 0.95rem;
  padding: 10px 6px;
  background: transparent;
  min-width: 0;
}

.claim-handle .btn { flex-shrink: 0; }

.hero-note { font-size: 0.85rem; color: var(--color-text-muted); }

.section { padding: 70px 24px; }
.section-soft { background: var(--color-bg-soft); }

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
}
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin: 0 0 12px;
}
.section-header p { color: var(--color-text-muted); margin: 0; }

.frame-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 24px;
}

.frame-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.frame-card-thumb {
  aspect-ratio: 1 / 1;
  background: var(--color-bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.frame-card-thumb img {
  width: 100%; height: 100%; object-fit: cover;
}

.frame-card-body { padding: 16px 18px 18px; }
.frame-card-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.frame-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
}
.frame-card-usage {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.step-item { text-align: center; padding: 8px; }
.step-icon {
  width: 64px; height: 64px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.6rem;
  font-weight: 700;
}
.step-item h3 { margin: 0 0 8px; font-size: 1.05rem; }
.step-item p { color: var(--color-text-muted); font-size: 0.9rem; margin: 0; }

.cta-band {
  margin: 0 24px 70px;
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  background: linear-gradient(135deg, var(--color-primary), #024f99);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  color: #fff;
  box-shadow: var(--shadow-hover);
}
.cta-band h2 { font-size: 1.8rem; margin: 0 0 12px; }
.cta-band p { opacity: 0.9; margin: 0 0 28px; }
.cta-band .btn-primary {
  background: #fff;
  color: var(--color-primary);
}
.cta-band .btn-primary:hover { background: var(--color-bg-soft); }

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 24px 28px;
  background: var(--color-bg-soft);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  max-width: 1180px;
  margin: 0 auto;
}
.footer-brand p { color: var(--color-text-muted); font-size: 0.9rem; max-width: 280px; margin-top: 12px; }
.footer-links { display: flex; gap: 60px; flex-wrap: wrap; }
.footer-col h4 {
  display: flex; align-items: center; gap: 7px;
  font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--color-text-muted); margin: 0 0 14px;
}
.footer-col h4 .icon { width: 14px; height: 14px; }
.footer-col a {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.9rem; margin-bottom: 10px; color: var(--color-text);
  transition: var(--transition-base);
}
.footer-col a .icon { width: 15px; height: 15px; color: var(--color-text-muted); flex-shrink: 0; transition: var(--transition-base); }
.footer-col a:hover { color: var(--color-primary); transform: translateX(2px); }
.footer-col a:hover .icon { color: var(--color-primary); }

.footer-bottom {
  max-width: 1180px;
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  text-align: center;
}
.footer-bottom .icon { width: 13px; height: 13px; color: var(--accent-coral); animation: footer-heart-beat 1.8s ease-in-out infinite; }
@keyframes footer-heart-beat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 84px; 
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(2, 101, 194, 0.35);
  cursor: pointer;
  z-index: 80;
  opacity: 0;
  transform: translateY(12px) scale(0.9);
  pointer-events: none;
  transition: var(--transition-base);
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.back-to-top:hover { background: var(--color-primary-dark); transform: translateY(-2px) scale(1.05); }
.back-to-top .icon { width: 18px; height: 18px; }

@media (min-width: 769px) {
  .back-to-top { bottom: 28px; }
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
  .steps-grid { grid-template-columns: 1fr; }
  .claim-handle { flex-direction: column; align-items: stretch; border-radius: var(--radius-lg); padding: 14px; gap: 10px; }
  .claim-handle .btn { width: 100%; }
  .cta-band { padding: 40px 24px; }
  .footer-inner { flex-direction: column; }
}

@media (max-width: 768px) {
  .nav-links {
    display: flex;
    position: fixed;
    top: 65px;
    left: 12px;
    right: 12px;
    z-index: 99;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.16);
    gap: 2px;
    opacity: 0;
    transform: translateY(-10px) scale(0.98);
    pointer-events: none;
    transition: opacity 0.22s cubic-bezier(0.16, 1, 0.3, 1), transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .nav-links.mobile-open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
  }
  .nav-links a { padding: 12px 14px; font-size: 0.98rem; }
  .nav-links a .icon { width: 18px; height: 18px; }
}

.navbar.is-scrolled .navbar-inner { padding-top: 10px; padding-bottom: 10px; }
.navbar.is-scrolled { box-shadow: 0 2px 12px rgba(15,23,42,0.06); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}