:root {
      --font-sans: system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
      --radius-xs: 3px;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-full: 999px;
      --shadow-sm: 0 1px 2px rgba(0,0,0,.08);
      --shadow-md: 0 4px 12px rgba(0,0,0,.12);
      --shadow-lg: 0 8px 28px rgba(0,0,0,.18);
      --ease: cubic-bezier(.4,.2,.2,1);
      --hue: 220;
      --bg: hsl(var(--hue) 20% 98%);
      --bg-alt: hsl(var(--hue) 33% 96%);
      --bg-soft: hsl(var(--hue) 30% 92%);
      --surface: #ffffff;
      --text: hsl(var(--hue) 25% 18%);
      --text-light: hsl(var(--hue) 12% 45%);
      --border: hsl(var(--hue) 25% 88%);
      --primary: hsl(258 90% 60%);
      --primary-accent: hsl(258 100% 67%);
      --accent: hsl(200 90% 55%);
      --danger: hsl(350 80% 55%);
      --gradient: linear-gradient(135deg,hsl(258 90% 62%),hsl(210 90% 55%));
    }
    [data-theme="dark"] {
      --bg: hsl(var(--hue) 15% 8%);
      --bg-alt: hsl(var(--hue) 20% 12%);
      --bg-soft: hsl(var(--hue) 18% 16%);
      --surface: hsl(var(--hue) 25% 14%);
      --text: hsl(var(--hue) 25% 92%);
      --text-light: hsl(var(--hue) 15% 65%);
      --border: hsl(var(--hue) 15% 28%);
      --primary: hsl(258 95% 72%);
      --primary-accent: hsl(258 100% 78%);
      --accent: hsl(198 100% 62%);
      --gradient: linear-gradient(135deg,hsl(258 80% 62%),hsl(198 90% 55%));
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: var(--font-sans);
      line-height: 1.55;
      color: var(--text);
      background: var(--bg);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }
    img,picture,svg { max-width: 100%; display: block; }
    a { color: var(--primary); text-decoration: none; }
    a:hover,a:focus-visible { text-decoration: underline; }
    .skip-link {
      position: absolute; left: -999px; top: 0; padding: .75rem 1rem;
      background: var(--primary); color: #fff; z-index: 1000; border-radius: var(--radius-sm);
    }
    .skip-link:focus { left: 1rem; top: 1rem; }
    .container {
      width: min(1200px, 100% - 2.5rem);
      margin-inline: auto;
    }
    header.site-header {
      position: sticky; top: 0; z-index: 50;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    [data-theme="dark"] header.site-header { background: rgba(20,20,25,.75); }
    .nav-inner {
      display: flex; align-items: center; gap: 2rem;
      min-height: 64px;
    }
    .logo {
      font-size: 1.15rem; font-weight: 600; letter-spacing: .5px;
      color: var(--text); text-decoration: none;
      display: inline-flex; align-items: center; gap: .5rem;
    }
    .nav-links {
      list-style: none; margin: 0 0 0 auto; padding: 0;
      display: flex; align-items: center; gap: 1.25rem;
    }
    .nav-links a, .nav-links button {
      font: inherit; background: none; border: 0;
      cursor: pointer; color: var(--text-light);
      padding: .55rem .9rem; border-radius: var(--radius-full);
      transition: background .3s var(--ease), color .3s var(--ease);
    }
    .nav-links a:hover,
    .nav-links button:hover,
    .nav-links a:focus-visible,
    .nav-links button:focus-visible {
      background: var(--bg-soft); color: var(--text);
      outline: 0;
    }
    .theme-toggle { font-size: 1rem; line-height: 1; }
    .nav-toggle {
      display: none; background: none; border: 0; padding: .5rem;
      cursor: pointer; border-radius: var(--radius-sm);
    }
    .nav-toggle:focus-visible { outline: 2px solid var(--primary); }
    .nav-toggle-bar {
      width: 24px; height: 2px; background: var(--text);
      display: block; position: relative;
    }
    .nav-toggle-bar + .nav-toggle-bar { margin-top: 5px; }
    .hero {
      position: relative; padding: clamp(4rem, 12vh, 8rem) 0 5rem;
      overflow: clip;
    }
    .hero:before {
      content: ""; position: absolute; inset: 0;
      background: radial-gradient(circle at 70% 30%, hsl(258 90% 70% / .18), transparent 60%),
                  radial-gradient(circle at 20% 70%, hsl(200 90% 65% / .18), transparent 65%);
      pointer-events: none;
    }
    .hero-bg-accent {
      position: absolute; inset: 0;
      background: var(--gradient);
      opacity: .08; mix-blend-mode: multiply;
      pointer-events: none;
    }
    .hero h1 {
      font-size: clamp(2.2rem, 5vw, 3.3rem);
      line-height: 1.1; margin: 0 0 1.25rem;
      letter-spacing: -.5px;
      background: linear-gradient(90deg,var(--text),var(--primary));
      -webkit-background-clip: text; color: transparent;
    }
    .lead {
      font-size: clamp(1.05rem, 1.4vw, 1.25rem);
      max-width: 48ch; margin: 0 0 2rem; color: var(--text-light);
    }
    .hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
    .section { padding: 4.5rem 0; }
    .section.alt { background: var(--bg-alt); }
    [data-theme="dark"] .section.alt { background: var(--bg-soft); }
    .flow > * + * { margin-top: 1.1em; }
    h2 {
      margin: 0 0 1.2rem;
      font-size: clamp(1.55rem, 2.3vw, 2.1rem);
      letter-spacing: -.5px;
    }
    h3 {
      margin: 0 0 .5rem;
      font-size: 1.05rem; font-weight: 600;
      letter-spacing: .3px;
    }
    .feature-grid {
      list-style: none; padding: 0; margin: 2rem 0 0;
      display: grid; gap: 1.25rem;
      grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
    }
    .feature-card {
      background: var(--surface);
      border: 1px solid var(--border);
      padding: 1.25rem 1.15rem 1.35rem;
      border-radius: var(--radius-md);
      position: relative;
      display: flex; flex-direction: column;
      gap: .4rem;
      box-shadow: var(--shadow-sm);
      transition: border-color .4s var(--ease), transform .35s var(--ease),
                  box-shadow .35s var(--ease), background .4s var(--ease);
    }
    .feature-card:before {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);
      opacity: 0; border-radius: inherit;
      transition: opacity .5s var(--ease);
      z-index: 0;
    }
    .feature-card > * { position: relative; z-index: 1; }
    .feature-card:hover,
    .feature-card:focus-within {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: transparent;
    }
    .feature-card:hover:before,
    .feature-card:focus-within:before { opacity: .08; }
    p { max-width: 70ch; }
    .btn {
      --_bg: var(--surface);
      --_color: var(--text);
      --_border: var(--border);
      font: inherit;
      display: inline-flex; align-items: center; justify-content: center;
      gap: .55rem;
      padding: .85rem 1.25rem;
      border-radius: var(--radius-full);
      border: 1px solid var(--_border);
      background: var(--_bg);
      color: var(--_color);
      cursor: pointer;
      font-weight: 600;
      letter-spacing: .3px;
      position: relative;
      transition: background .4s var(--ease), color .4s var(--ease),
                  border-color .4s var(--ease), transform .25s var(--ease),
                  box-shadow .35s var(--ease);
      text-decoration: none;
      box-shadow: var(--shadow-sm);
    }
    .btn:focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 2px;
    }
    .btn-primary {
      --_bg: var(--primary);
      --_color: #fff;
      --_border: var(--primary);
      box-shadow: 0 4px 16px -4px hsl(258 90% 50% / .5);
    }
    .btn-primary:hover {
      background: var(--primary-accent);
      border-color: var(--primary-accent);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .btn-outline {
      --_bg: transparent;
      --_color: var(--text);
      --_border: var(--border);
    }
    .btn-outline:hover {
      background: var(--bg-soft);
    }
    .btn-accent {
      --_bg: var(--accent);
      --_color: #fff;
      --_border: var(--accent);
      box-shadow: 0 4px 16px -4px hsl(200 90% 50% / .45);
    }
    .btn-accent:hover {
      filter: brightness(1.08);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .site-footer {
      background: var(--bg-alt);
      border-top: 1px solid var(--border);
      padding: 2.5rem 0;
      margin-top: 2rem;
    }
    [data-theme="dark"] .site-footer { background: var(--bg-soft); }
    .footer-inner {
      display: flex; flex-wrap: wrap;
      gap: 1.5rem;
      align-items: center;
      justify-content: space-between;
    }
    .footer-links {
      list-style: none; display: flex; gap: 1rem;
      padding: 0; margin: 0;
    }
    .footer-links a {
      color: var(--text-light);
      padding: .35rem .65rem;
      border-radius: var(--radius-full);
      transition: background .35s var(--ease), color .35s var(--ease);
    }
    .footer-links a:hover {
      background: var(--bg-soft);
      color: var(--text);
      text-decoration: none;
    }
    .noscript {
      background: var(--danger); color: #fff;
      text-align: center; padding: .75rem;
      font-size: .9rem;
    }
    @media (max-width: 860px) {
      .nav-toggle { display: inline-block; }
      .nav-links {
        position: fixed; inset: 0 0 0 auto;
        width: min(300px, 80%);
        background: var(--surface);
        flex-direction: column;
        padding: 5rem 1.75rem 2rem;
        gap: 1rem;
        transform: translateX(100%);
        transition: transform .6s var(--ease);
        box-shadow: -4px 0 18px -6px rgba(0,0,0,.2);
      }
      .nav-links.open { transform: translateX(0); }
      body.nav-open { overflow: hidden; }
      .hero { padding-top: 5.5rem; }
      .feature-grid { grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); }
    }
    @media (prefers-reduced-motion: reduce) {
      * { animation: none !important; transition: none !important; }
    }