/* AI Detector landing page — dark theme */

:root {
  --bg: #0a0e1a;
  --bg-alt: #0f1526;
  --card: #131a2e;
  --card-hover: #18203a;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8ecf5;
  --text-dim: #9aa5bd;
  --accent: #6366f1;
  --accent-2: #a855f7;
  --green: #34d399;
  --red: #f87171;
  --amber: #fbbf24;
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 750; }
h3 { font-size: 1.15rem; font-weight: 650; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.gradient-text {
  background: linear-gradient(100deg, #818cf8 0%, #c084fc 55%, #f0abfc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 10px; font-weight: 600; cursor: pointer;
  padding: 12px 22px; font-size: 0.95rem; border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(99, 102, 241, 0.5); }
.btn-ghost { background: rgba(255,255,255,0.05); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { background: rgba(255,255,255,0.1); }
.btn-lg { padding: 15px 30px; font-size: 1.05rem; }
.btn-sm { padding: 9px 18px; font-size: 0.875rem; }
.btn-block { width: 100%; }

/* ── Navbar ──────────────────────────────────────────── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 14, 26, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 750; font-size: 1.1rem; }
.logo-icon { font-size: 1.35rem; }
.nav-links { display: flex; align-items: center; gap: 26px; font-size: 0.92rem; color: var(--text-dim); }
.nav-links a:hover { color: var(--text); }
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.mobile-menu-btn span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* ── Hero ────────────────────────────────────────────── */
.hero { position: relative; padding: 90px 0 70px; overflow: hidden; }
.hero-glow {
  position: absolute; top: -260px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 600px; pointer-events: none;
  background: radial-gradient(ellipse, rgba(99,102,241,0.22) 0%, transparent 65%);
}
.hero-grid {
  position: relative; display: grid; grid-template-columns: 1.05fr 0.95fr;
  gap: 56px; align-items: center;
}
.badge-pill {
  display: inline-block; padding: 7px 16px; border-radius: 999px;
  background: rgba(99,102,241,0.12); border: 1px solid rgba(99,102,241,0.35);
  color: #b3b9ff; font-size: 0.82rem; font-weight: 600; margin-bottom: 22px;
}
.hero-subtitle { color: var(--text-dim); font-size: 1.12rem; margin: 20px 0 28px; max-width: 480px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-cta.center { justify-content: center; }
.hero-note { color: var(--text-dim); font-size: 0.85rem; margin-top: 16px; }
.hero-checks { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 26px; font-size: 0.85rem; color: var(--green); font-weight: 600; }
.hero-image img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 32px 80px rgba(0,0,0,0.55);
}

/* ── Sections ────────────────────────────────────────── */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-header { text-align: center; max-width: 640px; margin: 0 auto 54px; }
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem;
  font-weight: 700; color: var(--accent-2); margin-bottom: 12px;
}
.section-sub { color: var(--text-dim); margin-top: 14px; font-size: 1.02rem; }

/* ── Modes grid ──────────────────────────────────────── */
.modes-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px;
}
.mode-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 22px; transition: background 0.2s, border-color 0.2s, transform 0.2s;
  display: flex; flex-direction: column; gap: 10px;
}
.mode-card:hover { background: var(--card-hover); border-color: rgba(99,102,241,0.45); transform: translateY(-3px); }
.mode-card.highlight { border-color: rgba(168,85,247,0.55); background: linear-gradient(160deg, rgba(168,85,247,0.10), var(--card) 60%); }
.mode-icon { font-size: 1.9rem; }
.mode-card p { color: var(--text-dim); font-size: 0.9rem; flex: 1; }
.mode-tag {
  align-self: flex-start; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.04em;
  color: var(--green); background: rgba(52,211,153,0.12); border: 1px solid rgba(52,211,153,0.3);
  padding: 3px 10px; border-radius: 999px;
}

/* ── Comparison table ────────────────────────────────── */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.compare-table { width: 100%; border-collapse: collapse; min-width: 760px; background: var(--card); font-size: 0.92rem; }
.compare-table th, .compare-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.compare-table th { color: var(--text-dim); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.07em; }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table .yes { color: var(--green); font-weight: 600; }
.compare-table .no { color: var(--text-dim); }
.compare-table .part { color: var(--amber); }
.featured-row { background: linear-gradient(100deg, rgba(99,102,241,0.14), rgba(168,85,247,0.10)); }
.featured-row td:first-child { font-weight: 750; }

/* ── Showcases ───────────────────────────────────────── */
.showcase {
  display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 52px;
  align-items: center; padding: 44px 0;
}
.showcase.reverse { grid-template-columns: 1.15fr 0.85fr; }
.showcase.reverse .showcase-text { order: 2; }
.showcase.reverse .showcase-img { order: 1; }
.showcase-text h3 { font-size: 1.7rem; margin-bottom: 14px; }
.showcase-text p:not(.eyebrow) { color: var(--text-dim); }
.showcase-img img {
  border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgba(0,0,0,0.45);
}

/* ── Steps ───────────────────────────────────────────── */
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.step-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; }
.step-num {
  font-size: 0.85rem; font-weight: 800; color: var(--accent-2);
  letter-spacing: 0.1em; margin-bottom: 14px;
}
.step-card p { color: var(--text-dim); font-size: 0.9rem; margin-top: 8px; }

/* ── Audience chips ──────────────────────────────────── */
.audience-chips { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.audience-chips span {
  padding: 10px 20px; border-radius: 999px; background: var(--card);
  border: 1px solid var(--border); font-size: 0.92rem; color: var(--text-dim);
}

/* ── Pricing ─────────────────────────────────────────── */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; align-items: start; }
.price-card {
  position: relative; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px;
}
.price-card.featured { border-color: rgba(99,102,241,0.6); box-shadow: 0 16px 48px rgba(99,102,241,0.18); }
.price-flag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  color: #fff; font-size: 0.72rem; font-weight: 700; padding: 5px 14px; border-radius: 999px;
  white-space: nowrap;
}
.price { font-size: 2.4rem; font-weight: 800; margin: 10px 0 2px; }
.price span { font-size: 1rem; font-weight: 500; color: var(--text-dim); }
.price-sub { color: var(--text-dim); font-size: 0.88rem; margin-bottom: 20px; }
.price-card ul { list-style: none; margin-bottom: 26px; display: flex; flex-direction: column; gap: 9px; font-size: 0.9rem; }
.price-card li.ok::before { content: "✓ "; color: var(--green); font-weight: 700; }
.price-card li.off { color: var(--text-dim); opacity: 0.55; }
.price-card li.off::before { content: "✗ "; }

/* ── FAQ ─────────────────────────────────────────────── */
.faq-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 18px; }
.faq-item { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.faq-item p { color: var(--text-dim); font-size: 0.9rem; margin-top: 8px; }
.faq-item a { color: #a5b4fc; text-decoration: underline; }

/* ── Final CTA ───────────────────────────────────────── */
.cta-final {
  text-align: center; padding: 100px 0;
  background:
    radial-gradient(ellipse 60% 80% at 50% 0%, rgba(99,102,241,0.18), transparent),
    var(--bg-alt);
  border-top: 1px solid var(--border);
}
.cta-final p { color: var(--text-dim); margin: 16px 0 30px; font-size: 1.05rem; }

/* ── Disclaimer ──────────────────────────────────────── */
.disclaimer { padding: 50px 0; }
.disclaimer-box {
  background: rgba(251,191,36,0.06); border: 1px solid rgba(251,191,36,0.25);
  border-radius: var(--radius); padding: 26px 30px; max-width: 800px; margin: 0 auto;
}
.disclaimer-box h3 { margin-bottom: 8px; }
.disclaimer-box p { color: var(--text-dim); font-size: 0.92rem; }
.disclaimer-box strong { color: var(--text); }

/* ── Footer ──────────────────────────────────────────── */
.footer { border-top: 1px solid var(--border); padding: 56px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 40px; }
.footer-brand p { color: var(--text-dim); font-size: 0.9rem; margin-top: 12px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; font-size: 0.9rem; }
.footer-links h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-dim); margin-bottom: 4px; }
.footer-links a { color: var(--text-dim); }
.footer-links a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px;
  color: var(--text-dim); font-size: 0.85rem; text-align: center;
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-cta, .hero-checks { justify-content: center; }
  .showcase, .showcase.reverse { grid-template-columns: 1fr; gap: 24px; }
  .showcase.reverse .showcase-text { order: 1; }
  .showcase.reverse .showcase-img { order: 2; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-links {
    display: none; position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg-alt); border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; width: 100%; }
  .mobile-menu-btn { display: flex; }
  .section { padding: 64px 0; }
  .hero { padding: 56px 0 48px; }
}