styles.css

:root {
  --bg: #0b1220;
  --card: #0f1a2b;
  --brand: #7c5cff;
  --brand-2: #22e3ff;
  --text: #e6eefc;
  --muted: #9bb3d6;
  --card-alpha: rgba(15, 26, 43, 0.6);
  --white-alpha: rgba(230, 238, 252, 0.06);
  --ring: rgba(124, 92, 255, 0.55);
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --subhead: rgba(230,238,252,0.7);
  --progress: linear-gradient(90deg, var(--brand), var(--brand-2));
  --border: var(--white-alpha);
}

/* Light theme */
:root[data-theme="light"] {
  --bg: #f8f9fc;
  --card: #ffffff;
  --text: #0b1220;
  --muted: #42546f;
  --card-alpha: rgba(255,255,255,0.9);
  --white-alpha: rgba(0,0,0,0.06);
  --shadow: 0 10px 30px rgba(0,0,0,0.08);
  --subhead: rgba(11,18,32,0.65);
  --border: rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html { scroll-padding-top: 68px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.skip-link {
  position: absolute; left: -9999px; top: auto;
  background: var(--brand); color: #0b1220; padding: 8px 12px;
  border-radius: 8px; z-index: 10000;
}
.skip-link:focus { left: 12px; top: 12px; }

.container { width: min(1100px, 92%); margin: 0 auto; }
.section { padding: 64px 0; position: relative; min-height: 100svh; display: grid; align-items: center; scroll-snap-align: start; }
.presentation { scroll-snap-type: y mandatory; }
.section-title { font-size: 36px; margin: 0 0 16px; letter-spacing: 0.2px; }
.subhead { color: var(--subhead); font-weight: 700; font-size: 12px; letter-spacing: 1.8px; text-transform: uppercase; margin: 0 0 6px; }
@media (min-width: 960px) { .section-title { font-size: 42px; } }

/* Background grid + noise */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: -3;
  background-image: radial-gradient(1200px 800px at 70% -10%, rgba(124,92,255,0.25), transparent 60%), radial-gradient(800px 500px at 10% 110%, rgba(34,227,255,0.15), transparent 60%);
}
body::after {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: -2;
  background-image: linear-gradient(transparent 98%, rgba(255,255,255,0.03) 100%), linear-gradient(90deg, transparent 98%, rgba(255,255,255,0.03) 100%);
  background-size: 24px 24px, 24px 24px;
  mix-blend-mode: overlay;
}
:root[data-theme="light"] body::before { background-image: radial-gradient(1200px 800px at 70% -10%, rgba(124,92,255,0.10), transparent 60%), radial-gradient(800px 500px at 10% 110%, rgba(34,227,255,0.08), transparent 60%); }
:root[data-theme="light"] body::after { background-image: linear-gradient(transparent 98%, rgba(0,0,0,0.03) 100%), linear-gradient(90deg, transparent 98%, rgba(0,0,0,0.03) 100%); }

/* Header / Nav */
.site-header { position: sticky; top: 0; z-index: 1000; backdrop-filter: saturate(160%) blur(10px); background: rgba(11,18,32,0.65); border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; padding: 0 16px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; letter-spacing: 0.2px; }
.nav-actions { display: inline-flex; align-items: center; gap: 8px; }
.icon-btn { background: var(--card-alpha); border: 1px solid var(--border); color: var(--text); padding: 8px 10px; border-radius: 10px; cursor: pointer; }
.nav-toggle { display: inline-flex; flex-direction: column; gap: 4px; background: transparent; border: none; cursor: pointer; padding: 8px; border-radius: 8px; }
.nav-toggle:focus { outline: 2px solid var(--ring); outline-offset: 2px; }
.nav-toggle .bar { width: 22px; height: 2px; background: var(--text); display: block; }

/* Sidebar (TOC) */
.sidebar { position: fixed; top: 64px; left: 0; bottom: 0; width: 260px; background: rgba(15,26,43,0.75); border-right: 1px solid var(--border); transform: translateX(-100%); transition: transform 250ms ease; z-index: 900; backdrop-filter: blur(6px); }
:root[data-theme="light"] .sidebar { background: rgba(255,255,255,0.92); }
.sidebar.open { transform: translateX(0); }
.sidebar ol { list-style: none; margin: 0; padding: 12px; display: grid; gap: 8px; }
.sidebar a { display: block; color: var(--muted); text-decoration: none; padding: 10px 12px; border-radius: 10px; }
.sidebar a.active, .sidebar a:hover { color: var(--text); background: var(--white-alpha); }
@media (min-width: 1024px) { .sidebar { width: 240px; } body.sidebar-open { padding-left: 240px; } }

/* Progress bar */
.progress-bar { position: sticky; top: 64px; height: 3px; background: rgba(255,255,255,0.06); }
:root[data-theme="light"] .progress-bar { background: rgba(0,0,0,0.06); }
.progress-bar span { display: block; height: 100%; width: 0%; background: var(--progress); transition: width 100ms linear; }

/* Buttons */
.btn { --bgc: linear-gradient(90deg, var(--brand), var(--brand-2)); color: #0b1220; background: var(--bgc); border: none; padding: 12px 18px; border-radius: 12px; font-weight: 700; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; box-shadow: 0 10px 20px rgba(34,227,255,0.18), 0 6px 16px rgba(124,92,255,0.18); transform: translateZ(0); transition: transform 160ms ease, box-shadow 160ms ease; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 14px 28px rgba(34,227,255,0.22), 0 10px 22px rgba(124,92,255,0.22); }
.btn:focus { outline: 3px solid var(--ring); outline-offset: 2px; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--white-alpha); box-shadow: none; }
.btn-small { padding: 8px 12px; font-weight: 600; }
.btn-block { width: 100%; }

/* Cards */
.card { background: var(--card-alpha); border: 1px solid var(--border); border-radius: 16px; padding: 20px; box-shadow: var(--shadow); }
.glass { backdrop-filter: blur(10px) saturate(130%); }

/* Hero */
.hero { padding-top: 90px; overflow: hidden; }
.hero-inner { display: grid; gap: 28px; align-items: center; }
.headline { font-size: 40px; line-height: 1.1; margin: 0 0 12px; }
.subcopy { color: var(--muted); max-width: 60ch; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 18px 0 10px; }
.kpi-chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 10px 0 0; list-style: none; }
.chip { background: rgba(124,92,255,0.18); border: 1px solid var(--border); color: var(--text); padding: 6px 10px; border-radius: 999px; font-size: 12px; }
:root[data-theme="light"] .chip { background: rgba(124,92,255,0.10); }
.hero-art img { width: 100%; max-width: 480px; display: block; margin-inline: auto; }
.hero-art.realistic img { border-radius: 14px; border: 1px solid var(--border); box-shadow: 0 20px 40px rgba(0,0,0,0.35); }
.hero-art.realistic::after { content: ""; position: absolute; inset: 0; background: radial-gradient(80% 60% at 50% 40%, rgba(0,0,0,0.08), transparent 60%); pointer-events: none; }
.hero-art.realistic img { object-fit: cover; }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(1000px 600px at 70% 10%, rgba(124,92,255,0.16), transparent 60%), radial-gradient(700px 500px at 20% 80%, rgba(34,227,255,0.12), transparent 60%); z-index: -1; animation: shimmer 12s linear infinite; }
.hero-lines { position: absolute; left: 50%; bottom: 6%; width: min(800px, 92%); transform: translateX(-50%); opacity: 0.7; }

/* Brand banner in hero top space */
.brand-banner { position: absolute; top: 12px; left: 50%; transform: translateX(-50%); display: inline-flex; align-items: center; gap: 12px; padding: 10px 18px; border-radius: 999px; background: var(--card-alpha); border: 1px solid var(--border); box-shadow: 0 12px 28px rgba(0,0,0,0.28); backdrop-filter: blur(8px); z-index: 5; font-weight: 900; letter-spacing: 0.4px; font-size: clamp(18px, 2.6vw, 32px); }
.brand-banner img { width: clamp(24px, 3vw, 40px); height: clamp(24px, 3vw, 40px); }
.brand-banner .wordmark { background: linear-gradient(90deg, var(--brand), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }

@keyframes shimmer {
  0% { filter: hue-rotate(0deg) saturate(1); }
  50% { filter: hue-rotate(18deg) saturate(1.1); }
  100% { filter: hue-rotate(0deg) saturate(1); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-bg { animation: none; }
}

@media (min-width: 960px) { .hero-inner { grid-template-columns: 1.2fr 1fr; } .headline { font-size: 58px; } }

/* Two column */
.two-col .cols { display: grid; gap: 16px; }
@media (min-width: 800px) { .two-col .cols { grid-template-columns: 1fr 1fr; } }
.list { padding-left: 18px; color: var(--muted); }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.feature .icon { width: 32px; height: 32px; }
.feature h3 { margin: 10px 0; }
.feature ul { padding-left: 18px; color: var(--muted); }

/* Content helpers */
.small { font-size: 14px; color: var(--muted); }
.notes { color: var(--muted); }
.callout { background: rgba(124,92,255,0.08); border: 1px dashed var(--border); border-radius: 12px; padding: 12px; }
.legend { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.legend .key { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); }
.legend .swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; border: 1px solid var(--border); }
.content-grid { display: grid; gap: 12px; }
@media (min-width: 860px) { .content-grid.cols-2 { grid-template-columns: 1fr 1fr; } }

/* Tech flow */
.flow { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; list-style: none; padding: 0; margin: 0 0 16px; }
@media (min-width: 760px) { .flow { grid-template-columns: repeat(4, 1fr); } }
.flow li { background: var(--card-alpha); border: 1px solid var(--border); padding: 12px 14px; border-radius: 12px; text-align: center; }
.flow .step { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 999px; background: linear-gradient(90deg, var(--brand), var(--brand-2)); color: #0b1220; font-weight: 800; margin-right: 8px; }
.architecture { padding: 10px; }
.architecture svg { width: 100%; height: auto; display: block; }

/* Tabs */
.tablist { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-bottom: 12px; }
@media (min-width: 720px) { .tablist { grid-template-columns: repeat(4, 1fr); } }
.tab { background: var(--card-alpha); border: 1px solid var(--border); color: var(--text); border-radius: 12px; padding: 10px; cursor: pointer; font-weight: 600; }
.tab[aria-selected="true"] { outline: 2px solid var(--ring); }
.tab-panels { position: relative; }
.panel { display: none; gap: 16px; align-items: center; }
.panel.is-active { display: grid; }
.panel img { width: 100%; max-width: 520px; border-radius: 12px; border: 1px solid var(--border); }
.panel img.framed { max-height: 360px; object-fit: cover; }

/* Consistent media frame for use-case images */
.media { position: relative; width: 100%; max-width: 520px; aspect-ratio: 16 / 9; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
.media { min-height: 220px; }
.media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.media.tone::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(100% 140% at 80% 10%, rgba(124,92,255,0.08), transparent 60%), radial-gradient(100% 140% at 10% 90%, rgba(34,227,255,0.08), transparent 60%); }
.panel img.framed { background: var(--card-alpha); box-shadow: var(--shadow); }
.panel ul { color: var(--muted); padding-left: 18px; }

/* Impact */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.stat { text-align: center; padding: 24px; }
.stat .label { color: var(--muted); display: block; margin-bottom: 4px; }
.stat .num { font-size: 36px; font-weight: 800; letter-spacing: 0.5px; background: linear-gradient(90deg, var(--brand), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sparkline { width: 100%; max-width: 640px; height: auto; opacity: 0.9; }

/* Compare slider */
.compare { position: relative; overflow: hidden; padding: 0; aspect-ratio: 16 / 9; min-height: 220px; }
.compare img { display: block; width: 100%; height: auto; }
.compare .base { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 1; }
.compare .after-wrap { position: absolute; inset: 0; width: 50%; overflow: hidden; z-index: 2; border-right: 2px solid var(--brand-2); }
.compare .after { width: 100%; height: 100%; object-fit: cover; display: block; }
.compare .base, .compare .after { object-position: center center; filter: saturate(1.05) contrast(1.05); }
.compare .handle { position: absolute; top: 0; bottom: 0; left: 50%; transform: translateX(-50%); width: 0; z-index: 3; display: grid; place-items: center; }
.compare .handle .line { position: absolute; width: 2px; top: 0; bottom: 0; background: var(--brand-2); box-shadow: 0 0 0 3px rgba(34,227,255,0.18); }
.compare .handle .knob { position: relative; width: 18px; height: 18px; border-radius: 50%; background: linear-gradient(90deg, var(--brand), var(--brand-2)); border: 2px solid var(--card); box-shadow: var(--shadow); }
.compare .slider { position: absolute; inset: 0; width: 100%; height: 100%; appearance: none; background: none; cursor: ew-resize; z-index: 4; }
.compare .slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 24px; height: 24px; background: transparent; border: none; }
.compare .slider::-moz-range-thumb { width: 24px; height: 24px; background: transparent; border: none; }

/* Pricing */
.pricing-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.toggle { display: inline-flex; align-items: center; gap: 10px; color: var(--muted); }
.switch { position: relative; width: 48px; height: 26px; display: inline-block; }
.switch input { display: none; }
.slider-switch { position: absolute; inset: 0; background: var(--card-alpha); border: 1px solid var(--white-alpha); border-radius: 999px; transition: background 200ms ease; }
.slider-switch::after { content: ""; position: absolute; left: 2px; top: 2px; width: 22px; height: 22px; border-radius: 50%; background: linear-gradient(90deg, var(--brand), var(--brand-2)); transition: transform 220ms ease; }
.switch input:checked + .slider-switch::after { transform: translateX(22px); }

.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.price h3 { margin: 4px 0 8px; }
.price .price-amount { font-size: 28px; margin: 8px 0 12px; display: flex; align-items: baseline; gap: 4px; }
.price.featured { outline: 2px solid var(--ring); transform: translateZ(0); }

/* FAQ */
.acc-btn { width: 100%; text-align: left; background: var(--card-alpha); border: 1px solid var(--border); color: var(--text); padding: 12px 14px; border-radius: 12px; font-weight: 600; cursor: pointer; }
.acc-btn[aria-expanded="true"] { outline: 2px solid var(--ring); }
.acc-panel { padding: 10px 12px; color: var(--muted); }
.accordion .item { margin-bottom: 8px; }

/* Form */
.form-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.form-grid label { display: grid; gap: 6px; }
.form-grid input, .form-grid select, .form-grid textarea { background: rgba(230,238,252,0.04); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 10px; }
.form-grid input:focus, .form-grid select:focus, .form-grid textarea:focus { outline: 2px solid var(--ring); }
.form-grid .full { grid-column: 1 / -1; }
.form-status { margin-left: 12px; color: var(--brand-2); font-weight: 600; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 26px 0; background: rgba(11,18,32,0.65); backdrop-filter: blur(6px); }
:root[data-theme="light"] .site-footer { background: rgba(255,255,255,0.85); }
.footer-inner { display: grid; gap: 10px; align-items: center; grid-template-columns: 1fr; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; }
.footer-links { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--text); }
.disclaimer { color: var(--muted); margin: 6px 0; font-size: 14px; }
.social a img { width: 22px; height: 22px; opacity: 0.9; }
.social a img:hover { opacity: 1; }

/* Entrances (used by GSAP to fade-in) */
.fade-in { opacity: 0; transform: translateY(12px); }

/* Utility */
.grid { display: grid; gap: 16px; }
.form-actions { display: flex; align-items: center; gap: 12px; }

.source-badge { position: absolute; right: 16px; bottom: 16px; font-size: 12px; color: var(--muted); opacity: 0.9; }
.source-badge a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }

/* Arrow navigation and back to top */
.arrow-nav { position: fixed; bottom: 16px; padding: 10px 12px; border-radius: 10px; background: var(--card-alpha); border: 1px solid var(--border); color: var(--text); cursor: pointer; z-index: 950; }
.arrow-nav.prev { left: 16px; }
.arrow-nav.next { right: 16px; }
.arrow-nav[disabled] { opacity: 0.4; cursor: default; }
.back-to-top { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); padding: 10px 12px; border-radius: 10px; background: var(--card-alpha); border: 1px solid var(--white-alpha); color: var(--text); cursor: pointer; z-index: 950; opacity: 1; transition: opacity 180ms ease, transform 180ms ease; }
.back-to-top.is-hidden { opacity: 0; pointer-events: none; transform: translate(-50%, 10px); }

/* Slide counter */
.slide-counter { position: fixed; bottom: 60px; left: 50%; transform: translateX(-50%); color: var(--muted); background: var(--card-alpha); border: 1px solid var(--border); border-radius: 999px; padding: 6px 10px; font-size: 12px; z-index: 940; }

/* Slide entrance */
.slide { opacity: 0; transform: translateY(14px); transition: opacity 260ms ease, transform 260ms ease, background 600ms ease; }
.slide.is-visible { opacity: 1; transform: translateY(0); background-image: radial-gradient(800px 400px at 70% 10%, rgba(124,92,255,0.06), transparent 60%), radial-gradient(600px 300px at 10% 90%, rgba(34,227,255,0.05), transparent 60%); }

@media (max-width: 720px) {
  .slide { opacity: 1; transform: none; }
}

/* Print (Export Handout) */
@media print {
  @page { size: A4; margin: 12mm; }
  :root { --bg: #ffffff; --text: #000000; --muted: #333333; }
  * { animation: none !important; transition: none !important; }
  body { background: #fff; color: #000; padding-left: 0; }
  .site-header, .sidebar, .progress-bar, .arrow-nav, .back-to-top, .hero-bg, .hero-lines { display: none !important; }
  .section { min-height: auto; padding: 24px 0; break-inside: avoid; }
  .card, .glass { background: #fff; border: 1px solid #ddd; box-shadow: none; }
  .section-title { color: #000; }
}