/* ============================================================
   Crane Base — Reset, Typography, Utilities, Nav, Buttons, Footer
   ============================================================ */

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

body {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
img { -webkit-user-drag: none; user-drag: none; pointer-events: none; }
a img { pointer-events: auto; }

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---- Utilities ---- */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 24px; }
.text-blue { color: var(--blue-400); }
.text-slate { color: var(--slate-400); }
.text-sm { font-size: 0.875rem; }
.text-center { text-align: center; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }

/* ---- Nav ---- */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(224, 237, 255, 0.85);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--border);
  transition: background 3.5s ease, box-shadow 3.5s ease, border-color 3.5s ease;
}
nav.scrolled {
  background: rgba(224, 237, 255, 0.92);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}
nav .inner {
  max-width: var(--container-max); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
nav .brand { display: flex; align-items: center; text-decoration: none; }
nav .brand img { height: 56px; width: auto; }
nav .links {
  display: flex; gap: 20px; align-items: center; margin: 0 auto;
}
nav .links a {
  color: var(--slate-300); text-decoration: none; font-size: 0.9rem;
  font-weight: 500; transition: color 0.2s; white-space: nowrap;
}
nav .links a:hover { color: var(--blue-400); }

/* ---- Buttons ---- */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--blue-600); color: #fff;
  padding: 10px 22px; border-radius: 10px; font-weight: 600;
  font-size: 0.9rem; text-decoration: none; border: none; cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 2px 12px rgba(37, 99, 235, 0.3);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.btn-primary:hover {
  background: var(--blue-500);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
}
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--surface); color: var(--blue-600);
  padding: 10px 22px; border-radius: 10px; font-weight: 600;
  font-size: 0.9rem; text-decoration: none; cursor: pointer;
  border: 1px solid rgba(59, 130, 246, 0.3);
  transition: background 0.2s, border-color 0.2s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.btn-outline:hover {
  background: rgba(59, 130, 246, 0.06);
  border-color: var(--blue-500);
}

/* Gradient CTA (quiz button) — stacked gradient layers for smooth crossfade */
.btn-gradient {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 18px 40px; font-size: 1.15rem; font-weight: 700;
  color: #fff; background: transparent;
  border-radius: 14px; text-decoration: none; border: none; cursor: pointer;
  box-shadow: 0 4px 24px rgba(37,99,235,0.35);
  transition: transform 0.2s, box-shadow 3.5s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  position: relative; overflow: hidden; z-index: 0;
}
.btn-gradient::before,
.btn-gradient::after,
.btn-gradient .btn-grad-night {
  content: ''; position: absolute; inset: 0;
  border-radius: inherit; z-index: -1;
  transition: opacity 3.5s ease;
}
/* Day gradient (default — in ::before) */
.btn-gradient::before { background: linear-gradient(135deg, #2563eb, #7c3aed); opacity: 1; }
/* Dusk gradient (in ::after) */
.btn-gradient::after { background: linear-gradient(135deg, #d6942e, #e6ac40); opacity: 0; }
/* Night gradient (extra span needed since we ran out of pseudo-elements) */
.btn-gradient .btn-grad-night {
  content: none; /* it's a real element, not pseudo */
  display: block; position: absolute; inset: 0;
  background: linear-gradient(135deg, #3070d0, #00d4b8);
  border-radius: inherit; z-index: -1;
  opacity: 0; transition: opacity 3.5s ease;
}
[data-theme="day"] .btn-gradient::before { opacity: 1; }
[data-theme="day"] .btn-gradient::after { opacity: 0; }
[data-theme="dusk"] .btn-gradient::before { opacity: 0; }
[data-theme="dusk"] .btn-gradient::after { opacity: 1; }
[data-theme="night"] .btn-gradient::before { opacity: 0; }
[data-theme="night"] .btn-gradient::after { opacity: 0; }
[data-theme="night"] .btn-gradient .btn-grad-night { opacity: 1; }

.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 32px rgba(37,99,235,0.45);
}

/* ---- Footer ---- */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 40px 0;
}
footer .inner {
  max-width: var(--container-max); margin: 0 auto; padding: 0 24px;
  display: flex; justify-content: space-between; align-items: center;
}
footer .copy { font-size: 0.85rem; color: var(--text-sec); font-weight: 500; }
footer .links { display: flex; gap: 20px; }
footer .links a {
  font-size: 0.85rem; color: var(--text-sec); text-decoration: none; font-weight: 500;
}
footer .links a:hover { color: var(--blue-400); }

/* ---- Theme toggle ---- */
.theme-toggle {
  background: none; border: 1px solid var(--border); border-radius: 8px;
  padding: 6px 8px; cursor: pointer; color: var(--slate-400);
  display: flex; align-items: center; justify-content: center;
  transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--blue-400); border-color: var(--blue-400); }
.theme-toggle .icon-sun, .theme-toggle .icon-moon { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
[data-theme="night"] .theme-toggle .icon-sun { display: block; }
[data-theme="night"] .theme-toggle .icon-moon { display: none; }

/* ---- Language switcher ---- */
.lang-switcher { position: relative; }
.lang-toggle {
  background: none; border: 1px solid var(--border); border-radius: 8px;
  padding: 5px 10px; cursor: pointer; color: var(--slate-400);
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.8rem; font-weight: 500; font-family: inherit;
  transition: color 0.2s, border-color 0.2s; white-space: nowrap;
}
.lang-toggle:hover { color: var(--blue-400); border-color: var(--blue-400); }
.lang-toggle .icon-globe { width: 16px; height: 16px; flex-shrink: 0; }
.lang-dropdown {
  display: none; position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 6px 0; min-width: 200px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12); z-index: 200;
  max-height: 360px; overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(100,116,139,0.25) transparent;
}
.lang-dropdown.open { display: block; }
.lang-option {
  display: flex; align-items: center; gap: 10px;
  width: 100%; text-align: left; padding: 7px 14px;
  background: none; border: none; cursor: pointer;
  font-size: 0.85rem; font-family: inherit; color: var(--text);
  transition: background 0.15s; white-space: nowrap;
}
.lang-option:hover { background: rgba(59,130,246,0.08); }
.lang-option.active { color: var(--blue-400); font-weight: 600; background: rgba(59,130,246,0.06); }

/* ---- Nav actions ---- */
.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-actions .menu-toggle { display: none; }
.mobile-menu-controls { display: none; }

/* ---- Hamburger menu button ---- */
.menu-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  padding: 8px; width: 44px; height: 44px;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.menu-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Back to top ---- */
.back-to-top {
  position: fixed; bottom: 24px; right: 24px; z-index: 99;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--blue-600); color: #fff;
  border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 12px rgba(37, 99, 235, 0.4);
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.2s;
  pointer-events: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background: var(--blue-500); }

/* ---- Scroll progress bar ---- */
.scroll-progress-bar {
  position: fixed; top: 0; left: 0; width: 100%;
  height: 3px; z-index: 10001;
  background: linear-gradient(90deg, var(--blue-500), var(--blue-400));
  transform-origin: left; transform: scaleX(0);
  pointer-events: none;
}

/* ---- Dark mode overrides ---- */
[data-theme="night"] nav { background: rgba(13, 11, 24, 0.85); }
[data-theme="night"] nav.scrolled {
  background: rgba(13, 11, 24, 0.92);
  box-shadow: 0 2px 24px rgba(0,0,0,0.5);
}
[data-theme="night"] .back-to-top {
  background: #00d4b8;
  box-shadow: 0 2px 12px rgba(0,212,184,0.3);
}
[data-theme="night"] .back-to-top:hover { background: #00e5d0; }
[data-theme="night"] .scroll-progress-bar { background: linear-gradient(90deg, #00d4b8, #4888e0); }
[data-theme="night"] .menu-toggle span { background: var(--text); }
[data-theme="night"] .lang-dropdown {
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  scrollbar-color: rgba(148,163,184,0.2) transparent;
}

/* ---- Dusk mode overrides ---- */
[data-theme="dusk"] nav { background: rgba(58, 40, 32, 0.85); }
[data-theme="dusk"] nav.scrolled {
  background: rgba(58, 40, 32, 0.92);
  box-shadow: 0 2px 24px rgba(0,0,0,0.5);
}
[data-theme="dusk"] .back-to-top {
  background: #e6ac40;
  box-shadow: 0 2px 12px rgba(230,172,64,0.3);
}
[data-theme="dusk"] .back-to-top:hover { background: #eebb54; }
[data-theme="dusk"] .scroll-progress-bar { background: linear-gradient(90deg, #e6ac40, #d2942e); }
[data-theme="dusk"] .menu-toggle span { background: var(--text); }
[data-theme="dusk"] .lang-dropdown {
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  scrollbar-color: rgba(232,180,130,0.2) transparent;
}

/* ---- Theme switcher pills ---- */
.theme-pills {
  display: inline-flex; gap: 2px;
  background: rgba(0,0,0,0.08);
  border-radius: 8px; padding: 2px;
}
[data-theme="night"] .theme-pills,
[data-theme="dusk"] .theme-pills {
  background: rgba(255,255,255,0.08);
}
.theme-pill {
  background: none; border: none; cursor: pointer;
  padding: 4px 12px; border-radius: 6px;
  font-size: 0.75rem; font-weight: 600; font-family: inherit;
  color: var(--slate-400);
  transition: background-color 0.2s, color 0.2s, box-shadow 0.2s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.theme-pill:hover { color: var(--text); }
.theme-pill.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.12);
}

/* ---- Smooth theme color transitions (matches 3.5s hero crossfade) ---- */
body, nav, section, footer,
.feature-card, .price-card, .science-card, .cascade-card, .stat-card,
.privacy-box, .disclaimer-box, .demo-panel,
.faq-item, .faq-category h3, .faq-item summary, .faq-answer,
.btn-primary, .btn-outline,
.compare-table, .compare-table td, .compare-table th,
.timeline-table, .timeline-table td, .timeline-table th,
.ss-pill, .lang-toggle, .lang-dropdown, .lang-option,
.theme-pill, .back-to-top, .scroll-cue, .section-cue,
.best-value-badge, .trust-badges,
.feature-card h3, .feature-card p,
.science-card .quote, .science-card .cite,
.cascade-card p, .cascade-card .system-label,
.demo-panel h3, .demo-panel p,
.privacy-box h3, .privacy-box p,
.disclaimer-box h3, .disclaimer-box p,
.section-sub, .cost-counter .label,
nav .links a, footer .links a, footer .copy,
.price-card .tier, .price-card .price, .price-card .desc,
.price-card li,
.stat-card .stat-number, .stat-card .stat-desc, .stat-card .stat-source {
  transition: background-color 3.5s ease, color 3.5s ease,
              border-color 3.5s ease, box-shadow 3.5s ease;
}

/* Keep hover/focus transitions fast */
.btn-primary:hover, .btn-outline:hover, .btn-gradient:hover,
.feature-card:hover, .back-to-top:hover,
nav .links a:hover, footer .links a:hover,
.lang-toggle:hover, .lang-option:hover,
.theme-pill:hover, .faq-item summary:hover {
  transition-duration: 0.2s;
}