/* =========================================================
   Intel Comp Compare microsite — shared styles
   Used by: methodology.html, categories.html, summary.html,
            scores.html, resources.html
   (index.html uses inline styles — keep visually in sync.)
   ========================================================= */

:root {
  --bg: #d4e3f5;
  --bg-alt: #e8eef8;
  --bg-deep: #c3d2ee;
  --ink: #001f54;
  --ink-soft: #455168;
  --highlight: #00c7fd;
  --accent: #0071c5;
  --amd: #6b7280;
  --card: #ffffff;
  --card-border: #d4def0;
  --line: #c0cee6;
  --shadow-soft: 0 18px 32px rgba(0, 31, 84, 0.18);
  --shadow-card: 0 20px 40px -8px rgba(0, 31, 84, 0.22);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.36, 0.64, 1);
  --dur-xs: 0.2s;
  --dur-sm: 0.4s;
  --dur-md: 0.7s;
  --dur-lg: 1.2s;
  --delay-stagger: 0.1s;
  --top-bar-h: 60px;
}

/* z-index ladder (document only — keep stacking decisions visible)
   50  .top-bar (sticky)
   49  .mobile-nav (slide-in)
    3  .vpro-badge (hero)
    2  .hero-content / .scroll-icon
    1  hero SVG decor / .inner-hero > *
*/

[data-theme="dark"] {
  --bg: #061226;
  --bg-alt: #0a1a33;
  --bg-deep: #04101f;
  --ink: #e8eef8;
  --ink-soft: #a3b5d6;
  --highlight: #00c7fd;
  --accent: #4aa8e6;
  --amd: #8b94a3;
  --card: #112646;
  --card-border: #1f3563;
  --line: #1f3563;
  --shadow-soft: 0 18px 32px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 20px 40px -8px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
[id] { scroll-margin-top: calc(var(--top-bar-h) + 20px); }

/* Visible keyboard focus across all interactive elements */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--highlight);
  outline-offset: 2px;
  border-radius: 4px;
}
.btn:focus-visible {
  outline-offset: 4px;
}
body {
  font-family: 'Inter', 'Intel Clear', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink); background: var(--bg);
  line-height: 1.5; -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.45s ease, color 0.45s ease;
}

/* ===== Top bar ===== */
.top-bar {
  border-bottom: 1px solid var(--line);
  padding: 12px 40px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px;
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  transition: background 0.45s ease, border-color 0.45s ease;
}
.top-bar .brand-lockup {
  display: flex; align-items: center; gap: 12px;
  font-weight: 800; font-size: 18px; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none;
}
.brand-mark {
  width: 30px; height: 30px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent); color: #fff;
  border-radius: 6px;
  font-weight: 800; font-size: 12px; letter-spacing: -0.02em;
}
.top-nav {
  display: flex; gap: 4px; align-items: center;
}
.top-nav a {
  color: var(--ink-soft); text-decoration: none;
  font-size: 13.5px; font-weight: 600; letter-spacing: -0.005em;
  padding: 8px 14px; border-radius: 6px;
  position: relative;
  transition: color 0.3s ease, background 0.3s ease;
}
.top-nav a:hover { color: var(--ink); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.top-nav a.active { color: var(--ink); }
.top-nav a.active::after {
  content: ''; position: absolute;
  left: 14px; right: 14px; bottom: -2px; height: 2px;
  background: var(--accent); border-radius: 2px;
}
.top-bar .meta { display: flex; align-items: center; gap: 14px; color: var(--ink); font-size: 13px; }
.meta-tag {
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--ink-soft);
  padding: 4px 10px; border: 1px solid var(--line);
  border-radius: 100px;
}
.theme-toggle {
  background: transparent; border: 1px solid var(--line);
  color: var(--ink); width: 36px; height: 36px;
  border-radius: 50%; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: border-color 0.3s ease, transform 0.3s var(--ease-spring), background 0.3s ease;
  font-family: inherit;
}
.theme-toggle:hover { border-color: var(--ink); transform: rotate(20deg); }
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ===== Hamburger menu ===== */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  width: 36px; height: 36px;
  border-radius: 6px;
  cursor: pointer;
  align-items: center; justify-content: center;
  transition: border-color 0.3s ease, background 0.3s ease;
  font-family: inherit;
}
.nav-toggle:hover { border-color: var(--ink); }
.nav-toggle .bars {
  display: flex; flex-direction: column; gap: 4px;
  width: 16px;
}
.nav-toggle .bars span {
  display: block; width: 100%; height: 2px;
  background: var(--ink); border-radius: 2px;
  transition: transform 0.3s var(--ease-out-expo), opacity 0.3s ease;
}
body.nav-open .nav-toggle .bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
body.nav-open .nav-toggle .bars span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle .bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  position: fixed; top: 60px; left: 0; right: 0;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  padding: 16px 24px 24px;
  z-index: 49;
  transform: translateY(-12px);
  opacity: 0; pointer-events: none;
  transition: transform 0.35s var(--ease-out-expo), opacity 0.3s ease;
}
body.nav-open .mobile-nav {
  transform: translateY(0);
  opacity: 1; pointer-events: auto;
}
.mobile-nav a {
  display: block; padding: 14px 0;
  color: var(--ink); text-decoration: none;
  font-size: 15px; font-weight: 600;
  border-bottom: 1px solid var(--line);
  transition: color 0.3s ease, padding-left 0.3s var(--ease-out-expo);
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: var(--accent); padding-left: 6px; }
.mobile-nav a.active { color: var(--accent); }
.mobile-nav a.active::before {
  content: ''; display: inline-block;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); margin-right: 10px; vertical-align: 2px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 12px;
  background: var(--card); color: var(--ink);
  padding: 16px 32px; border: 1.5px solid var(--ink);
  font-weight: 700; font-size: 14px; letter-spacing: 0.02em;
  cursor: pointer; text-decoration: none; font-family: inherit;
  position: relative; overflow: hidden; isolation: isolate;
  transition: color 0.4s ease, transform 0.15s ease, border-color 0.4s ease;
}
.btn::before {
  content: ''; position: absolute; inset: 0;
  background: var(--ink); transform: translateY(101%);
  transition: transform 0.45s var(--ease-out-expo); z-index: -1;
}
.btn:hover { color: var(--card); transform: translateY(-2px); }
.btn:hover::before { transform: translateY(0); }
.btn:active { transform: translateY(0); }
.btn .arrow { display: inline-block; transition: transform 0.4s var(--ease-out-expo); }
.btn:hover .arrow { transform: translateX(4px); }
.btn-primary {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.btn-primary::before { background: #001f54; }
.btn-primary:hover { color: #fff; border-color: #001f54; }

/* ===== Inner-page hero ===== */
.inner-hero {
  position: relative;
  padding: 80px 80px 60px;
  overflow: hidden;
  background:
    radial-gradient(ellipse 50% 70% at 90% 50%, rgba(0, 199, 253, 0.20), transparent 60%),
    radial-gradient(circle at 50% 100%, rgba(0, 113, 197, 0.14), transparent 50%),
    linear-gradient(180deg, var(--bg-alt) 0%, var(--bg-deep) 100%);
  transition: background 0.45s ease;
}
[data-theme="dark"] .inner-hero {
  background:
    radial-gradient(ellipse 50% 70% at 90% 50%, rgba(0, 199, 253, 0.16), transparent 60%),
    radial-gradient(circle at 50% 100%, rgba(0, 113, 197, 0.10), transparent 50%),
    linear-gradient(180deg, #0a1a33 0%, #04101f 100%);
}
.inner-hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    repeating-linear-gradient(0deg,  transparent 0 80px, rgba(0, 31, 84, 0.04) 80px 81px),
    repeating-linear-gradient(90deg, transparent 0 80px, rgba(0, 31, 84, 0.04) 80px 81px);
  pointer-events: none;
}
[data-theme="dark"] .inner-hero::before {
  background:
    repeating-linear-gradient(0deg,  transparent 0 80px, rgba(0, 199, 253, 0.04) 80px 81px),
    repeating-linear-gradient(90deg, transparent 0 80px, rgba(0, 199, 253, 0.04) 80px 81px);
}
.inner-hero > * { position: relative; z-index: 1; }
.inner-hero-eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 12px; font-weight: 800; color: var(--ink);
  margin-bottom: 22px; letter-spacing: 0.14em; text-transform: uppercase;
  opacity: 0; transform: translateY(8px);
  animation: rise 0.6s var(--ease-out-quart) 0.1s forwards;
}
.inner-hero-eyebrow::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--highlight);
}
.inner-hero-eyebrow .step {
  font-weight: 700; color: var(--ink-soft);
}
.inner-hero h1 {
  font-size: clamp(38px, 5.5vw, 72px);
  font-weight: 800; line-height: 1.02; letter-spacing: -0.035em;
  color: var(--ink); margin-bottom: 22px;
  max-width: 1100px;
  opacity: 0; transform: translateY(16px);
  animation: rise 0.8s var(--ease-out-expo) 0.25s forwards;
}
.inner-hero h1 .highlight {
  position: relative; padding: 0 6px 0 0;
  background: linear-gradient(transparent 60%, var(--highlight) 60%);
  background-size: 0% 100%;
  background-repeat: no-repeat;
  background-position: left bottom;
  animation: wipe-highlight 0.9s var(--ease-out-expo) 0.7s forwards;
}
@keyframes wipe-highlight { to { background-size: 100% 100%; } }
.inner-hero p.lead {
  font-size: clamp(15px, 1.3vw, 18px);
  color: var(--ink); line-height: 1.65;
  max-width: 760px;
  opacity: 0; transform: translateY(12px);
  animation: rise 0.7s var(--ease-out-quart) 0.5s forwards;
}
@keyframes rise { to { opacity: 1; transform: translateY(0); } }

/* ===== Section base ===== */
section.page-section {
  background: var(--bg-alt);
  padding: 80px 80px 100px;
  position: relative; overflow: hidden;
  transition: background 0.45s ease;
}
section.page-section.alt {
  background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg-deep) 100%);
}
[data-theme="dark"] section.page-section.alt {
  background: linear-gradient(180deg, #0a1a33 0%, #04101f 100%);
}
.section-eyebrow {
  font-size: 14px; color: var(--ink-soft);
  font-style: italic; margin-bottom: 18px;
}
.section-title {
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 800; letter-spacing: -0.025em;
  line-height: 1.05; margin-bottom: 18px; color: var(--ink);
}
.section-title .highlight {
  position: relative; padding: 0 6px 0 0;
  background: linear-gradient(transparent 60%, var(--highlight) 60%);
  background-size: 0% 100%;
  background-repeat: no-repeat;
  background-position: left bottom;
  transition: background-size 0.9s var(--ease-out-expo);
}
.reveal-in .section-title .highlight,
.reveal-in.section-title .highlight { background-size: 100% 100%; }
.section-body {
  font-size: 15px; color: var(--ink);
  line-height: 1.7; max-width: 720px; margin-bottom: 20px;
}

.section-label {
  font-size: 12px; font-weight: 800;
  color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: 14px;
  display: inline-flex; align-items: center; gap: 10px;
}
.section-label::before {
  content: ''; width: 28px; height: 1.5px; background: var(--accent);
}

/* ===== Reveal-on-scroll ===== */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity 0.9s var(--ease-out-expo), transform 0.9s var(--ease-out-expo);
}
.reveal.reveal-in { opacity: 1; transform: translateY(0); }
.reveal-stagger > * {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}
.reveal-stagger.reveal-in > * { opacity: 1; transform: translateY(0); }
.reveal-stagger.reveal-in > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.reveal-in > *:nth-child(2) { transition-delay: 0.13s; }
.reveal-stagger.reveal-in > *:nth-child(3) { transition-delay: 0.21s; }
.reveal-stagger.reveal-in > *:nth-child(4) { transition-delay: 0.29s; }
.reveal-stagger.reveal-in > *:nth-child(5) { transition-delay: 0.37s; }
.reveal-stagger.reveal-in > *:nth-child(6) { transition-delay: 0.45s; }
.reveal-stagger.reveal-in > *:nth-child(7) { transition-delay: 0.53s; }
.reveal-stagger.reveal-in > *:nth-child(8) { transition-delay: 0.61s; }

/* ===== Inter-page nav (prev/next) ===== */
.page-nav {
  background: var(--bg);
  padding: 36px 80px;
  border-top: 1px solid var(--line);
  display: grid; grid-template-columns: 1fr auto 1fr;
  gap: 24px; align-items: center;
  transition: background 0.45s ease, border-color 0.45s ease;
}
.page-nav .nav-link {
  display: inline-flex; flex-direction: column; gap: 4px;
  text-decoration: none; color: inherit;
  padding: 12px 0;
  transition: color 0.3s ease, transform 0.3s var(--ease-out-expo);
}
.page-nav .nav-link.prev { justify-self: start; align-items: flex-start; }
.page-nav .nav-link.next { justify-self: end; align-items: flex-end; text-align: right; }
.page-nav .nav-link .step {
  font-size: 11px; font-weight: 700;
  color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.08em;
  display: inline-flex; align-items: center; gap: 8px;
}
.page-nav .nav-link .label {
  font-size: 18px; font-weight: 800;
  color: var(--ink); letter-spacing: -0.015em;
  line-height: 1.2;
  display: inline-flex; align-items: center; gap: 10px;
}
.page-nav .nav-link.prev:hover { transform: translateX(-3px); }
.page-nav .nav-link.next:hover { transform: translateX(3px); }
.page-nav .nav-link:hover .label { color: var(--accent); }
.page-nav .nav-link .arrow { transition: transform 0.3s var(--ease-out-expo); }
.page-nav .nav-link.prev:hover .arrow { transform: translateX(-4px); }
.page-nav .nav-link.next:hover .arrow { transform: translateX(4px); }
.page-nav .nav-counter {
  font-size: 12px; font-weight: 700;
  color: var(--ink-soft); letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ===== Footer ===== */
footer {
  background: var(--bg);
  padding: 32px 40px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 36px;
  font-size: 12px; color: var(--ink-soft);
  transition: background 0.45s ease;
}
footer .brand-lockup {
  font-weight: 800; font-size: 16px; color: var(--ink);
  flex-shrink: 0; padding-top: 4px; text-decoration: none;
}
footer .legal { line-height: 1.6; }
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }
.footer-pages {
  display: flex; gap: 22px; flex-wrap: wrap;
  align-items: center;
  margin-bottom: 18px;
}
.footer-pages a {
  font-size: 12px; font-weight: 600;
  color: var(--ink-soft); text-decoration: none;
  letter-spacing: -0.005em;
  transition: color 0.3s ease;
}
.footer-pages a:hover { color: var(--accent); }
.footer-pages .sep { color: var(--line); user-select: none; }

/* ===== Footnote refs ===== */
.fn-ref {
  color: inherit;
  text-decoration: none;
  border-bottom: none;
  transition: color 0.2s ease;
}
.fn-ref:hover, .fn-ref:focus-visible {
  color: var(--accent);
}
.fn-back {
  display: inline-block;
  margin-left: 0.4em;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95em;
  line-height: 1;
  transition: transform 0.2s var(--ease-out-expo);
}
.fn-back:hover { transform: translateY(-1px); }

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .inner-hero h1, .inner-hero p.lead, .inner-hero-eyebrow,
  .inner-hero h1 .highlight {
    opacity: 1 !important; transform: none !important;
    background-size: 100% 100% !important;
  }
  .reveal, .reveal-stagger > * { opacity: 1 !important; transform: none !important; }
  /* Suppress decorative looping/idle animations defined in per-page styles */
  .die-glow, .chip-shine-svg, .spider-pulse, .pulse-dot, .scroll-icon,
  .hero::before, .inner-hero::before { animation: none !important; }
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .top-nav a { padding: 8px 9px; font-size: 12.5px; }
}
@media (max-width: 979px) {
  .top-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .meta .meta-tag { display: none; }
  .top-bar { padding: 10px 24px; }
  .inner-hero { padding: 56px 24px 44px; }
  section.page-section { padding-left: 24px; padding-right: 24px; }
  .page-nav { padding: 28px 24px; }
  footer { padding-left: 24px; padding-right: 24px; }
}
@media (max-width: 767px) {
  .inner-hero h1 { font-size: clamp(32px, 9vw, 52px); }
  .page-nav {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .page-nav .nav-link.prev, .page-nav .nav-link.next {
    justify-self: start; align-items: flex-start; text-align: left;
  }
  .page-nav .nav-counter { display: none; }
  footer { flex-direction: column; gap: 16px; align-items: flex-start; }
  footer .legal { max-width: 100%; }
  .footer-pages { gap: 14px 18px; }
}
@media (max-width: 479px) {
  .top-bar, .inner-hero, section.page-section, .page-nav, footer {
    padding-left: 16px; padding-right: 16px;
  }
  .inner-hero h1 { font-size: clamp(28px, 11vw, 42px); }
}