/* ========================================
   InputLab - Hardware Testing Platform
   Design System & Global Styles
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=DM+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* — CSS Variables — */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a2035;
  --bg-card-hover: #1f2847;
  --bg-surface: #0f1629;
  --text-primary: #e8ecf4;
  --text-secondary: #8b95a9;
  --text-muted: #5a6478;
  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --accent-red: #ef4444;
  --accent-purple: #8b5cf6;
  --border-color: #1e293b;
  --border-light: #2a3550;
  --glow-blue: rgba(59, 130, 246, 0.15);
  --glow-cyan: rgba(6, 182, 212, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3), 0 1px 4px rgba(0,0,0,0.2);
  --shadow-glow: 0 0 30px rgba(59,130,246,0.1);
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* — Reset — */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent-blue); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--accent-cyan); }
img { max-width: 100%; display: block; }
button { font-family: var(--font-body); cursor: pointer; }

/* — Background grain texture — */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

/* — Layout — */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }

/* — Navbar — */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--border-color);
  padding: 0 24px;
}
.navbar-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.navbar-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 700; font-size: 1.3rem;
  color: var(--text-primary);
}
.navbar-logo .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: #fff;
}
.navbar-nav { display: flex; gap: 4px; list-style: none; }
.navbar-nav a {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.navbar-nav a:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.navbar-nav a.active { color: var(--accent-blue); background: var(--glow-blue); }
.navbar-nav .nav-icon { font-size: 1.1rem; }

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; padding: 4px; }

/* — Hero Section — */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute; top: -100px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, var(--glow-blue) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}
.hero-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.2; position: relative; z-index: 1;
  background: linear-gradient(135deg, #e8ecf4 30%, var(--accent-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.1rem; color: var(--text-secondary);
  margin-top: 16px; max-width: 600px; margin-inline: auto;
  position: relative; z-index: 1;
}

/* — Section Headers — */
.section-header {
  margin-bottom: 32px;
  display: flex; align-items: center; gap: 12px;
}
.section-header h2 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.5rem; color: var(--text-primary);
}
.section-header .section-line {
  flex: 1; height: 1px;
  background: linear-gradient(90deg, var(--border-light), transparent);
}
.section-header .section-icon { font-size: 1.4rem; }

/* — Card Grid — */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.card-grid-3 { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.card-grid-4 { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }

/* — Tool Cards (homepage test modules) — */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition-slow);
  position: relative; overflow: hidden;
}
.tool-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  transform: scaleX(0); transition: transform var(--transition-slow);
  transform-origin: left;
}
.tool-card:hover { border-color: var(--border-light); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.tool-card:hover::before { transform: scaleX(1); }
.tool-card .card-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: var(--bg-surface); border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  border: 1px solid var(--border-color);
}
.tool-card h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; margin-bottom: 8px; }
.tool-card p { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.6; }
.tool-card .card-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 24px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: #fff; font-weight: 600; font-size: 0.88rem;
  border: none; transition: all var(--transition-normal);
}
.tool-card .card-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(59,130,246,0.3); color: #fff; }

/* — Product Cards (affiliate) — */
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-slow);
}
.product-card:hover { border-color: var(--border-light); transform: translateY(-3px); box-shadow: var(--shadow-card); }
.product-card .product-img {
  width: 100%; aspect-ratio: 4/3; object-fit: cover;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}
.product-card .product-body { padding: 20px; }
.product-card h3 { font-family: var(--font-display); font-weight: 600; font-size: 1rem; margin-bottom: 6px; }
.product-card p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.5; }
.product-card .product-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 20px;
  border: 1.5px solid var(--accent-blue); color: var(--accent-blue);
  font-weight: 600; font-size: 0.82rem;
  background: transparent; transition: all var(--transition-fast);
}
.product-card .product-btn:hover { background: var(--accent-blue); color: #fff; }

/* — Article Cards (blog) — */
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-slow);
}
.article-card:hover { border-color: var(--border-light); transform: translateY(-3px); box-shadow: var(--shadow-card); }
.article-card .article-img {
  width: 100%; aspect-ratio: 16/10; object-fit: cover;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}
.article-card .article-body { padding: 18px; }
.article-card h3 { font-family: var(--font-display); font-weight: 600; font-size: 0.95rem; margin-bottom: 12px; line-height: 1.4; }
.article-card .article-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 20px;
  border: 1.5px solid var(--accent-green); color: var(--accent-green);
  font-weight: 600; font-size: 0.8rem;
  background: transparent; transition: all var(--transition-fast);
}
.article-card .article-btn:hover { background: var(--accent-green); color: #fff; }

/* — Quick Links — */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.quick-link {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 24px 16px; border-radius: var(--radius-lg);
  background: var(--bg-card); border: 1px solid var(--border-color);
  transition: all var(--transition-slow);
  text-align: center;
}
.quick-link:hover { border-color: var(--accent-blue); transform: translateY(-3px); box-shadow: var(--shadow-glow); color: var(--text-primary); }
.quick-link .ql-icon { font-size: 2rem; }
.quick-link span { font-family: var(--font-display); font-weight: 600; font-size: 0.88rem; color: var(--text-primary); }

/* — Footer — */
.footer {
  margin-top: 80px;
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  position: relative; z-index: 1;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 20px;
}
.footer-links { display: flex; gap: 24px; list-style: none; }
.footer-links a { font-size: 0.85rem; color: var(--text-secondary); }
.footer-links a:hover { color: var(--text-primary); }
.footer-copy { font-size: 0.82rem; color: var(--text-muted); }

/* — Test Page Layout — */
.test-page { padding: 40px 0; }
.test-area {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 32px;
  margin-bottom: 20px;
  position: relative;
}
.test-info-bar {
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center;
  margin-bottom: 24px;
  padding: 16px 20px;
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono); font-size: 0.85rem;
}
.test-info-bar .info-item { display: flex; align-items: center; gap: 6px; }
.test-info-bar .info-label { color: var(--text-muted); }
.test-info-bar .info-value { color: var(--accent-cyan); font-weight: 600; }
.test-controls {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px;
}

/* — Buttons — */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.9rem; border: none;
  transition: all var(--transition-fast); cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan)); color: #fff; }
.btn-primary:hover { box-shadow: 0 4px 16px rgba(59,130,246,0.3); transform: translateY(-1px); }
.btn-secondary { background: var(--bg-surface); border: 1px solid var(--border-light); color: var(--text-primary); }
.btn-secondary:hover { border-color: var(--accent-blue); }
.btn-danger { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); color: var(--accent-red); }
.btn-danger:hover { background: var(--accent-red); color: #fff; }

/* — Section Spacing — */
.section { padding: 48px 0; }

/* — Status indicators — */
.status-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.status-dot.green { background: var(--accent-green); box-shadow: 0 0 8px rgba(16,185,129,0.4); }
.status-dot.red { background: var(--accent-red); box-shadow: 0 0 8px rgba(239,68,68,0.4); }
.status-dot.yellow { background: var(--accent-orange); box-shadow: 0 0 8px rgba(245,158,11,0.4); }

/* — Alert/Message box — */
.alert {
  padding: 16px 20px; border-radius: var(--radius-md);
  font-size: 0.9rem; display: flex; align-items: flex-start; gap: 10px;
}
.alert-info { background: rgba(59,130,246,0.1); border: 1px solid rgba(59,130,246,0.2); color: var(--accent-blue); }
.alert-success { background: rgba(16,185,129,0.1); border: 1px solid rgba(16,185,129,0.2); color: var(--accent-green); }
.alert-error { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.2); color: var(--accent-red); }
.alert-warning { background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.2); color: var(--accent-orange); }

/* — Placeholder images — */
.placeholder-img {
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-card) 100%);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 2rem;
}

/* — Responsive — */
@media (max-width: 768px) {
  .navbar-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); flex-direction: column; padding: 12px; }
  .navbar-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .hero { padding: 48px 0 36px; }
  .test-area { padding: 20px; border-radius: var(--radius-lg); }
  .test-info-bar { flex-direction: column; align-items: flex-start; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; flex-wrap: wrap; }
}

/* — Animations — */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 8px rgba(59,130,246,0.2); }
  50% { box-shadow: 0 0 20px rgba(59,130,246,0.4); }
}
.fade-in { animation: fadeInUp 0.5s ease both; }
.fade-in-d1 { animation-delay: 0.1s; }
.fade-in-d2 { animation-delay: 0.2s; }
.fade-in-d3 { animation-delay: 0.3s; }
.fade-in-d4 { animation-delay: 0.4s; }