/* TK-DAS v1.0 — Dark Theme */
:root {
  --bg: #0a0e17;
  --bg2: #111827;
  --bg3: #1a2234;
  --surface: #1e293b;
  --border: #2d3a4f;
  --text: #e2e8f0;
  --text2: #94a3b8;
  --text3: #64748b;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --critical: #dc2626;
  --info: #6366f1;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Nav */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 14, 23, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.logo {
  font-size: 1.4rem; font-weight: 800; color: var(--primary);
  text-decoration: none; letter-spacing: -0.5px;
}
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-link { color: var(--text2); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
.nav-link:hover, .nav-link.active { color: var(--text); }
.hamburger { display: none; background: none; border: none; color: var(--text); font-size: 1.5rem; cursor: pointer; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border: none; border-radius: 8px;
  font-size: 0.9rem; font-weight: 600; cursor: pointer;
  transition: all 0.2s; text-decoration: none; color: var(--text);
  background: var(--surface);
}
.btn:hover { background: var(--bg3); transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-lg { padding: 14px 32px; font-size: 1.05rem; border-radius: 10px; }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-full { width: 100%; justify-content: center; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }

/* Cards */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: all 0.2s;
}
.card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }

/* Score Circle */
.score-circle {
  width: 180px; height: 180px; border-radius: 50%; position: relative;
  display: flex; align-items: center; justify-content: center; flex-direction: column;
  margin: 0 auto 24px;
}
.score-circle .score-value { font-size: 3rem; font-weight: 800; line-height: 1; }
.score-circle .score-grade { font-size: 1.2rem; font-weight: 600; opacity: 0.8; }
.score-a { background: radial-gradient(circle, rgba(16,185,129,0.15) 0%, transparent 70%); border: 3px solid var(--success); color: var(--success); }
.score-b { background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, transparent 70%); border: 3px solid var(--primary); color: var(--primary); }
.score-c { background: radial-gradient(circle, rgba(245,158,11,0.15) 0%, transparent 70%); border: 3px solid var(--warning); color: var(--warning); }
.score-d { background: radial-gradient(circle, rgba(239,68,68,0.15) 0%, transparent 70%); border: 3px solid var(--danger); color: var(--danger); }
.score-f { background: radial-gradient(circle, rgba(220,38,38,0.15) 0%, transparent 70%); border: 3px solid var(--critical); color: var(--critical); }

/* Landing */
.hero {
  text-align: center; padding: 80px 20px 60px;
  background: radial-gradient(ellipse at 50% 0%, rgba(59,130,246,0.08) 0%, transparent 60%);
}
.hero h1 { font-size: 3rem; font-weight: 800; margin-bottom: 16px; letter-spacing: -1px; }
.hero h1 span { color: var(--primary); }
.hero p { font-size: 1.2rem; color: var(--text2); max-width: 600px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.features {
  padding: 60px 20px;
  max-width: 1200px; margin: 0 auto;
}
.features h2 { text-align: center; font-size: 2rem; margin-bottom: 40px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
.feature-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; text-align: center;
}
.feature-card .icon { font-size: 2.5rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { font-size: 0.85rem; color: var(--text2); }

/* Pricing */
.pricing { padding: 60px 20px; max-width: 800px; margin: 0 auto; }
.pricing h2 { text-align: center; font-size: 2rem; margin-bottom: 40px; }
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.pricing-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; text-align: center;
}
.pricing-card.featured { border-color: var(--primary); box-shadow: 0 0 30px rgba(59,130,246,0.15); }
.pricing-card .price { font-size: 2.5rem; font-weight: 800; margin: 16px 0; }
.pricing-card .price span { font-size: 1rem; font-weight: 400; color: var(--text2); }
.pricing-card ul { list-style: none; text-align: left; margin: 20px 0; }
.pricing-card li { padding: 6px 0; color: var(--text2); font-size: 0.9rem; }
.pricing-card li::before { content: '\2713 '; color: var(--success); font-weight: 700; }

/* Scan Page */
.scan-page { padding: 40px 20px; max-width: 900px; margin: 0 auto; }
.scan-page h1 { font-size: 2rem; margin-bottom: 8px; }
.scan-page .subtitle { color: var(--text2); margin-bottom: 32px; }
.scan-progress { margin: 40px 0; text-align: center; }
.scan-progress .spinner {
  width: 60px; height: 60px; border: 4px solid var(--border);
  border-top-color: var(--primary); border-radius: 50%;
  animation: spin 1s linear infinite; margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.scan-status { font-size: 1.1rem; color: var(--text2); }

/* Results */
.results { padding: 40px 20px; max-width: 1000px; margin: 0 auto; }
.findings-list { margin-top: 16px; }
.finding {
  display: flex; gap: 12px; padding: 14px 16px;
  border-left: 3px solid var(--border); margin-bottom: 8px;
  background: var(--bg2); border-radius: 0 8px 8px 0;
}
.finding.critical { border-left-color: var(--critical); }
.finding.high { border-left-color: var(--danger); }
.finding.medium { border-left-color: var(--warning); }
.finding.low { border-left-color: var(--info); }
.finding.info { border-left-color: var(--text3); }
.finding .sev-badge {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  padding: 2px 8px; border-radius: 4px; white-space: nowrap; height: fit-content;
}
.sev-critical { background: rgba(220,38,38,0.2); color: var(--critical); }
.sev-high { background: rgba(239,68,68,0.2); color: var(--danger); }
.sev-medium { background: rgba(245,158,11,0.2); color: var(--warning); }
.sev-low { background: rgba(99,102,241,0.2); color: var(--info); }
.sev-info { background: rgba(100,116,139,0.2); color: var(--text3); }
.finding-title { font-weight: 600; font-size: 0.9rem; }
.finding-desc { font-size: 0.8rem; color: var(--text2); margin-top: 2px; }
.finding-fix { font-size: 0.8rem; color: var(--success); margin-top: 4px; }

/* Dashboard */
.dashboard { padding: 40px 20px; max-width: 1200px; margin: 0 auto; }
.dashboard h1 { font-size: 2rem; margin-bottom: 24px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.stat-card .stat-value { font-size: 2rem; font-weight: 800; }
.stat-card .stat-label { font-size: 0.8rem; color: var(--text2); }
.history-table { width: 100%; border-collapse: collapse; margin-top: 16px; }
.history-table th, .history-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); }
.history-table th { color: var(--text2); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; }
.history-table tr:hover { background: var(--bg2); }

/* Category Bar */
.cat-bar { display: flex; gap: 4px; margin-top: 16px; }
.cat-segment {
  height: 8px; border-radius: 4px; flex: 1; transition: all 0.3s;
}

/* Settings */
.settings { padding: 40px 20px; max-width: 700px; margin: 0 auto; }
.settings h1 { font-size: 2rem; margin-bottom: 24px; }
.setting-group { margin-bottom: 24px; }
.setting-group h3 { font-size: 1rem; margin-bottom: 12px; color: var(--text2); }
.setting-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; margin-bottom: 8px;
}
.setting-row label { font-size: 0.9rem; }

/* Modal */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center; z-index: 200;
  backdrop-filter: blur(4px);
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; width: 400px; max-width: 90vw;
  position: relative;
}
.modal-close {
  position: absolute; top: 12px; right: 16px;
  background: none; border: none; color: var(--text2); font-size: 1.5rem; cursor: pointer;
}
.modal-content h2 { margin-bottom: 20px; }
.modal-content input {
  width: 100%; padding: 12px; margin-bottom: 12px;
  background: var(--bg2); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); font-size: 0.95rem;
}
.modal-content input:focus { outline: none; border-color: var(--primary); }
.auth-toggle { text-align: center; margin-top: 16px; font-size: 0.85rem; color: var(--text2); }
.auth-toggle a { color: var(--primary); text-decoration: none; }

/* Error/Success messages */
.error { color: var(--danger); font-size: 0.85rem; margin-top: 8px; padding: 8px; background: rgba(239,68,68,0.1); border-radius: 6px; }
.success { color: var(--success); font-size: 0.85rem; margin-top: 8px; padding: 8px; background: rgba(16,185,129,0.1); border-radius: 6px; }
.hidden { display: none !important; }

/* Footer */
footer {
  text-align: center; padding: 24px 20px; border-top: 1px solid var(--border);
  color: var(--text3); font-size: 0.8rem; margin-top: 60px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg); padding: 20px; border-bottom: 1px solid var(--border); }
  .hamburger { display: block; }
  .feature-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .history-table { font-size: 0.8rem; }
  .history-table th:nth-child(3), .history-table td:nth-child(3) { display: none; }
}