/* ══════════════════════════════════════════════════════════
   REGEX PLAYGROUND PRO — Design System
   ══════════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #08080d; --bg2: #0f0f18; --bg3: #161622;
  --card: rgba(255,255,255,0.03); --card-hover: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.08); --border-hover: rgba(255,255,255,0.15);
  --text: #f0f0f5; --text2: #8888a0; --text3: #55556a;
  --blue: #3B82F6; --blue-bg: rgba(59,130,246,0.12);
  --purple: #8B5CF6; --purple-bg: rgba(139,92,246,0.12);
  --green: #10B981; --green-bg: rgba(16,185,129,0.12);
  --amber: #F59E0B; --amber-bg: rgba(245,158,11,0.12);
  --red: #EF4444; --pink: #EC4899;
  --match-bg: rgba(59,130,246,0.25); --match-border: rgba(59,130,246,0.6);
  --grad: linear-gradient(135deg, #3B82F6, #8B5CF6, #EC4899);
  --font: 'Inter', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --radius: 16px; --radius-sm: 10px;
}
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ── Nav ─────────────────────────────────────────────────── */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 14px 0; backdrop-filter: blur(20px) saturate(180%); background: rgba(8,8,13,0.85); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; }
.logo-icon { font-size: 1.4rem; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { font-size: 0.88rem; font-weight: 500; color: var(--text2); transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-back { opacity: 0.5; font-size: 0.82rem !important; }

/* ── Hero ────────────────────────────────────────────────── */
.hero { min-height: 60vh; display: flex; align-items: center; text-align: center; padding: 120px 24px 60px; position: relative; overflow: hidden; }
.hero-glow { position: absolute; top: -200px; left: 50%; transform: translateX(-50%); width: 800px; height: 500px; background: radial-gradient(ellipse, rgba(59,130,246,0.08),rgba(139,92,246,0.05),transparent 70%); pointer-events: none; }
.hero-content { position: relative; max-width: 720px; margin: 0 auto; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px 6px 6px; background: var(--blue-bg); border: 1px solid rgba(59,130,246,0.2); border-radius: 100px; font-size: 0.8rem; font-weight: 500; color: var(--blue); margin-bottom: 28px; }
.badge-dot { width: 8px; height: 8px; background: var(--blue); border-radius: 50%; animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)}50%{opacity:0.4;transform:scale(0.7)} }
.hero h1 { font-size: clamp(2.2rem,5vw,3.5rem); font-weight: 900; line-height: 1.15; letter-spacing: -1.5px; }
.gradient-text { background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: 1.1rem; color: var(--text2); max-width: 520px; margin: 16px auto 0; line-height: 1.7; }
.btn-primary { display: inline-flex; align-items: center; gap: 8px; margin-top: 28px; padding: 14px 32px; background: var(--grad); border: none; border-radius: 100px; font-size: 1rem; font-weight: 600; color: white; cursor: pointer; transition: all 0.3s; box-shadow: 0 4px 20px rgba(59,130,246,0.25); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(59,130,246,0.35); }
.btn-secondary { display: inline-flex; padding: 14px 28px; background: var(--card); border: 1px solid var(--border); border-radius: 100px; font-size: 0.95rem; font-weight: 500; color: var(--text2); cursor: pointer; transition: all 0.3s; }
.btn-secondary:hover { background: var(--card-hover); border-color: var(--border-hover); color: var(--text); }

/* ── Section ─────────────────────────────────────────────── */
.section { padding: 60px 0; }
.section-dark { background: var(--bg2); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-label { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 2px; color: var(--blue); margin-bottom: 12px; }
.section-title { font-size: 2rem; font-weight: 800; letter-spacing: -0.8px; }
.section-sub { font-size: 1rem; color: var(--text2); max-width: 480px; margin: 10px auto 0; }

/* ── NL Bar ──────────────────────────────────────────────── */
.nl-bar { margin-bottom: 24px; }
.nl-label { font-size: 0.82rem; font-weight: 600; color: var(--purple); margin-bottom: 8px; }
.nl-row { display: flex; gap: 10px; }
.nl-row input { flex: 1; padding: 14px 18px; background: rgba(139,92,246,0.08); border: 1px solid rgba(139,92,246,0.25); border-radius: var(--radius-sm); font-size: 0.95rem; font-family: var(--font); color: var(--text); outline: none; transition: border-color 0.3s; }
.nl-row input:focus { border-color: var(--purple); }
.nl-row input::placeholder { color: var(--text3); }
.btn-generate { padding: 14px 24px; background: var(--purple); border: none; border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 600; color: white; cursor: pointer; transition: all 0.3s; white-space: nowrap; }
.btn-generate:hover { background: #7C3AED; transform: translateY(-1px); }

/* ── Playground ──────────────────────────────────────────── */
.playground-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; }
.panel h3 { font-size: 0.9rem; font-weight: 700; margin-bottom: 14px; }
.panel-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.panel-header h3 { margin-bottom: 0; }

/* Regex Input */
.regex-input-wrap { display: flex; align-items: center; gap: 4px; background: rgba(255,255,255,0.04); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 4px 12px; transition: border-color 0.3s; }
.regex-input-wrap:focus-within { border-color: var(--blue); }
.regex-slash { color: var(--blue); font-family: var(--mono); font-size: 1.1rem; font-weight: 600; }
.regex-input { flex: 1; background: none; border: none; outline: none; font-family: var(--mono); font-size: 1rem; color: var(--text); padding: 10px 4px; }
.regex-flags { color: var(--amber); font-family: var(--mono); font-size: 0.9rem; font-weight: 600; }

/* Flags */
.flags-row { display: flex; gap: 8px; }
.flag-toggle { display: flex; align-items: center; gap: 4px; cursor: pointer; font-size: 0.78rem; }
.flag-toggle input { display: none; }
.flag-toggle span { padding: 3px 8px; background: rgba(255,255,255,0.06); border: 1px solid var(--border); border-radius: 6px; font-family: var(--mono); font-weight: 600; color: var(--text3); transition: all 0.2s; }
.flag-toggle input:checked + span { background: var(--blue-bg); border-color: rgba(59,130,246,0.4); color: var(--blue); }

/* Match Info */
.match-info { display: flex; justify-content: space-between; margin-top: 10px; font-size: 0.78rem; font-family: var(--mono); color: var(--text2); }

/* Test Input */
.test-input { width: 100%; background: rgba(255,255,255,0.04); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px; font-family: var(--mono); font-size: 0.88rem; color: var(--text); outline: none; resize: vertical; line-height: 1.8; transition: border-color 0.3s; }
.test-input:focus { border-color: var(--blue); }

/* Highlighted Text */
.highlighted-text { font-family: var(--mono); font-size: 0.88rem; line-height: 1.8; white-space: pre-wrap; word-break: break-all; min-height: 180px; color: var(--text2); }
.highlighted-text .match { background: var(--match-bg); border: 1px solid var(--match-border); border-radius: 3px; padding: 1px 2px; color: var(--text); }
.highlighted-text .match:nth-child(odd) { background: rgba(139,92,246,0.2); border-color: rgba(139,92,246,0.5); }

/* Match Table */
.match-table { max-height: 300px; overflow-y: auto; }
.match-row { display: grid; grid-template-columns: 40px 1fr 80px; gap: 8px; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: 0.82rem; align-items: center; }
.match-row:hover { background: var(--card-hover); }
.match-idx { font-family: var(--mono); color: var(--text3); font-weight: 600; }
.match-val { font-family: var(--mono); color: var(--blue); word-break: break-all; }
.match-pos { font-family: var(--mono); color: var(--text3); font-size: 0.75rem; }
.match-empty { text-align: center; padding: 24px; color: var(--text3); font-size: 0.85rem; }
.btn-copy-sm { padding: 4px 12px; background: var(--card); border: 1px solid var(--border); border-radius: 100px; font-size: 0.75rem; font-weight: 600; color: var(--text2); cursor: pointer; transition: all 0.2s; }
.btn-copy-sm:hover { background: var(--card-hover); }

/* Explanation */
.explanation { font-size: 0.88rem; color: var(--text2); line-height: 1.7; }
.exp-token { display: flex; gap: 12px; padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.04); }
.exp-code { font-family: var(--mono); color: var(--blue); font-weight: 600; min-width: 80px; flex-shrink: 0; }
.exp-desc { color: var(--text2); }

/* ── Pattern Library ─────────────────────────────────────── */
.pattern-filters { display: flex; gap: 8px; justify-content: center; margin-bottom: 32px; flex-wrap: wrap; }
.filter-btn { padding: 8px 18px; background: var(--card); border: 1px solid var(--border); border-radius: 100px; font-size: 0.82rem; font-weight: 600; color: var(--text2); cursor: pointer; transition: all 0.2s; }
.filter-btn:hover { background: var(--card-hover); }
.filter-btn.active { background: var(--blue-bg); border-color: rgba(59,130,246,0.4); color: var(--blue); }
.pattern-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.pattern-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; cursor: pointer; transition: all 0.3s; }
.pattern-card:hover { background: var(--card-hover); border-color: var(--border-hover); transform: translateY(-2px); }
.pattern-name { font-size: 0.92rem; font-weight: 700; margin-bottom: 6px; }
.pattern-regex { font-family: var(--mono); font-size: 0.78rem; color: var(--blue); padding: 6px 10px; background: rgba(59,130,246,0.08); border-radius: 6px; margin-bottom: 8px; word-break: break-all; }
.pattern-desc { font-size: 0.8rem; color: var(--text3); }
.pattern-tag { display: inline-block; font-size: 0.65rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; padding: 2px 8px; border-radius: 100px; margin-top: 8px; }
.pattern-tag.validation { background: var(--green-bg); color: var(--green); }
.pattern-tag.extraction { background: var(--blue-bg); color: var(--blue); }
.pattern-tag.formatting { background: var(--amber-bg); color: var(--amber); }
.pattern-tag.security { background: var(--purple-bg); color: var(--purple); }

/* ── Cheatsheet ──────────────────────────────────────────── */
.cheat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.cheat-group { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.cheat-group h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 14px; color: var(--blue); }
.cheat-row { display: flex; gap: 12px; padding: 6px 0; border-bottom: 1px solid rgba(255,255,255,0.04); align-items: baseline; }
.cheat-row code { font-family: var(--mono); font-size: 0.82rem; color: var(--amber); font-weight: 600; min-width: 60px; }
.cheat-row span { font-size: 0.82rem; color: var(--text2); }

/* ── CTA ─────────────────────────────────────────────────── */
.cta-section { text-align: center; }
.cta-box { max-width: 520px; margin: 0 auto; padding: 56px 40px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); }
.cta-box h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 12px; }
.cta-box p { color: var(--text2); margin-bottom: 28px; }
.cta-actions { display: flex; gap: 12px; justify-content: center; }
.ghl-form { display: flex; flex-direction: column; gap: 12px; max-width: 420px; margin: 0 auto; }
.ghl-input { width: 100%; padding: 14px 20px; background: rgba(255,255,255,0.04); border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.95rem; color: var(--text); font-family: var(--font); outline: none; transition: border-color 0.3s, background 0.3s; }
.ghl-input:focus { border-color: var(--accent); background: rgba(255,255,255,0.06); }
.ghl-input::placeholder { color: var(--text3); }
.ghl-submit { margin-top: 4px; width: 100%; display: flex; align-items: center; justify-content: center; }
.ghl-consent { font-size: 0.72rem !important; color: var(--text3) !important; line-height: 1.5; margin-bottom: 0 !important; margin-top: 4px; }
.ghl-consent strong { color: var(--text2); }
.ghl-success { padding: 16px 24px; background: rgba(16,185,129,0.1); border: 1px solid rgba(16,185,129,0.3); border-radius: var(--radius-sm); color: #10B981; font-weight: 600; font-size: 0.95rem; text-align: center; }
.ghl-error { padding: 12px 20px; background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3); border-radius: var(--radius-sm); color: #EF4444; font-size: 0.85rem; text-align: center; }

/* ── Footer ──────────────────────────────────────────────── */
.footer { padding: 40px 0; border-top: 1px solid var(--border); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; font-size: 0.85rem; color: var(--text3); }
.footer-built { font-family: var(--mono); font-size: 0.78rem; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .playground-layout { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .cheat-grid { grid-template-columns: 1fr; }
  .pattern-grid { grid-template-columns: 1fr; }
  .cta-actions { flex-direction: column; }
  .nl-row { flex-direction: column; }
}