:root {
  color-scheme: light dark;
  --font-sans: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --radius-sm: 0.55rem;
  --radius-md: 0.95rem;
  --radius-lg: 1.4rem;
  --shadow-sm: 0 10px 24px rgba(14, 22, 39, 0.1);
  --shadow-lg: 0 25px 65px rgba(14, 22, 39, 0.2);
  --bg: #f5f8ff;
  --bg-elevated: #ffffff;
  --bg-subtle: #edf4ff;
  --text: #08111f;
  --muted: #4b5b73;
  --border: #cfe0f5;
  --accent: #00c6e8;
  --accent-strong: #00a6cc;
  --accent-contrast: #001218;
}

:root[data-theme="dark"] {
  --bg: #060d18;
  --bg-elevated: #0d1728;
  --bg-subtle: #15243d;
  --text: #eef6ff;
  --muted: #a7bed8;
  --border: #27405f;
  --accent: #13ddff;
  --accent-strong: #6ceeff;
  --accent-contrast: #001015;
  --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 32px 70px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }
html:focus-within { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: radial-gradient(circle at 10% -10%, color-mix(in srgb, var(--accent) 25%, transparent), transparent 35%), var(--bg);
  line-height: 1.6;
}

.container { width: min(1120px, 92vw); margin: 0 auto; }
.page-intro { max-width: 72ch; margin-bottom: var(--space-5); }
a { color: var(--accent-strong); }
img { max-width: 100%; height: auto; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.skip-link { position: absolute; left: var(--space-4); top: -100%; background: var(--accent); color: var(--accent-contrast); padding: var(--space-2) var(--space-4); border-radius: var(--radius-sm); z-index: 999; }
.skip-link:focus { top: var(--space-3); }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(12px); }
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
.brand { display: inline-flex; gap: var(--space-3); align-items: center; color: var(--text); text-decoration: none; font-weight: 700; }
.brand img { width: 42px; height: 42px; border-radius: 10px; border: 1px solid var(--border); }
.brand small { display: block; color: var(--muted); font-size: .82rem; font-weight: 500; }

.nav-wrap { display: flex; gap: var(--space-3); align-items: center; }
.nav-toggle { display: none; }
nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: var(--space-2); }
nav a { text-decoration: none; color: var(--muted); font-weight: 650; border-radius: var(--radius-sm); padding: var(--space-2) var(--space-3); }
nav a.active, nav a:hover { color: var(--text); background: var(--bg-subtle); }

.icon-btn { border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text); border-radius: 999px; width: 42px; height: 42px; cursor: pointer; }
main { padding-bottom: var(--space-8); }
section { padding: var(--space-7) 0; }

.hero { display: grid; gap: var(--space-6); grid-template-columns: 1.15fr .85fr; align-items: center; padding-top: var(--space-8); }
.eyebrow { display: inline-block; background: color-mix(in srgb, var(--accent) 16%, var(--bg-subtle)); border: 1px solid color-mix(in srgb, var(--accent) 60%, var(--border)); padding: .34rem .72rem; border-radius: 999px; font-size: .8rem; font-weight: 700; letter-spacing: .02em; }
h1,h2,h3 { line-height: 1.2; margin-top: 0; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: var(--space-4); }
h2 { font-size: clamp(1.45rem, 3vw, 2.2rem); }
.lead { font-size: 1.12rem; color: var(--muted); max-width: 66ch; }

.card { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--space-5); box-shadow: var(--shadow-sm); }
.hero-card { box-shadow: var(--shadow-lg); }
.price { font-size: 1.9rem; font-weight: 800; margin: var(--space-2) 0; }
.badge-row,.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }
.badge { font-size: .84rem; border: 1px solid var(--border); background: var(--bg-subtle); border-radius: 999px; padding: .3rem .65rem; }

.btn { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; border-radius: 999px; border: 1px solid transparent; padding: .72rem 1.05rem; font-weight: 700; min-height: 44px; }
.btn-primary { color: var(--accent-contrast); background: linear-gradient(130deg, var(--accent), var(--accent-strong)); }
.btn-secondary { color: var(--text); border-color: var(--border); background: var(--bg-elevated); }

.grid-2,.grid-3 { display: grid; gap: var(--space-4); }
.grid-2 { grid-template-columns: repeat(2,minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3,minmax(0,1fr)); }

.site-footer { border-top: 1px solid var(--border); background: var(--bg-elevated); padding: var(--space-5) 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-3); color: var(--muted); }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .5s ease, transform .5s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.muted { color: var(--muted); }

@media (max-width: 900px) {
  .hero,.grid-2,.grid-3 { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-flex; }
  nav { position: absolute; top: 78px; left: 0; right: 0; background: var(--bg-elevated); border-bottom: 1px solid var(--border); display: none; }
  nav.open { display: block; }
  nav ul { padding: var(--space-4); flex-direction: column; }
}


body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 85% 0%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 32%);
  z-index: -1;
}

.btn, .card, .icon-btn, nav a {
  transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease, color .2s ease, border-color .2s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn-primary:hover { box-shadow: 0 16px 28px color-mix(in srgb, var(--accent) 35%, transparent); }
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.quick-links { margin-top: var(--space-4); }
.quick-link { text-decoration: none; color: var(--text); font-weight: 650; display: flex; align-items: center; min-height: 96px; border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); background: linear-gradient(140deg, color-mix(in srgb, var(--accent) 12%, var(--bg-elevated)), var(--bg-elevated)); }
.giscus-shell { padding: var(--space-6); }
.giscus-shell #giscus-thread { margin-top: var(--space-4); }
.feedback-form { max-width: 760px; }
.form-row { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-4); }
.form-row label { font-weight: 650; }
.form-row input, .form-row textarea, .form-row select { width: 100%; border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text); border-radius: var(--radius-sm); padding: .72rem .85rem; font: inherit; }
.form-row textarea { resize: vertical; min-height: 140px; }
.hidden-field { position: absolute; left: -9999px; }
.error-text { min-height: 1.3rem; margin: var(--space-2) 0 0; color: #d73737; font-weight: 600; }
.thanks-card { max-width: 720px; margin: var(--space-8) auto 0; }