/* CCNA Learning Platform */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #0a0e14;
  --bg-elevated: #151b24;
  --bg-card: #1c2430;
  --bg-card-hover: #222d3a;
  --border: #2d3a47;
  --border-focus: #3d4f5f;
  --text: #e8edf4;
  --text-muted: #8b9aab;
  --accent: #00b894;
  --accent-hover: #00cec9;
  --accent-soft: rgba(0, 184, 148, 0.12);
  --accent-glow: rgba(0, 184, 148, 0.25);
  --font: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

/* ── Header ── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 14, 20, 0.92);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 2rem;
}
.site-header .inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; gap: 2rem;
}
.logo { font-weight: 700; font-size: 1.3rem; letter-spacing: -0.02em; color: var(--text); flex-shrink: 0; }
.logo:hover { color: var(--text); }

.nav-links { display: flex; gap: 1.75rem; align-items: center; }
.nav-links a { color: var(--text-muted); font-weight: 500; font-size: 0.9rem; transition: color var(--transition); }
.nav-links a:hover { color: var(--text); }

.header-actions { display: flex; align-items: center; gap: 0.75rem; margin-left: auto; }

.contact-btn {
  display: inline-flex; align-items: center;
  padding: 0.45rem 0.9rem;
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text-muted); font: inherit; font-size: 0.85rem; font-weight: 500;
  text-decoration: none; transition: all var(--transition);
}
.contact-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

.search-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text-muted); font: inherit; font-size: 0.85rem; font-weight: 500;
  cursor: pointer; transition: all var(--transition);
}
.search-btn svg { opacity: 0.7; }
.search-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

.lang-selector {
  display: flex; gap: 2px; padding: 3px;
  background: var(--bg-elevated); border-radius: 8px; border: 1px solid var(--border);
}
.lang-selector button {
  padding: 0.35rem 0.7rem; border: none; background: transparent;
  color: var(--text-muted); font: inherit; font-size: 0.8rem; font-weight: 600;
  cursor: pointer; border-radius: 6px; transition: all var(--transition); letter-spacing: 0.02em;
}
.lang-selector button:hover { color: var(--text); }
.lang-selector button.active { background: var(--accent); color: var(--bg); }

/* ── Hero ── */
.hero {
  padding: 5rem 2rem 4rem; text-align: center;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -40%; left: 50%; transform: translateX(-50%);
  width: 120%; max-width: 1000px; height: 500px;
  background: radial-gradient(ellipse at center, var(--accent-soft) 0%, transparent 65%);
  pointer-events: none;
}
.hero-content { position: relative; max-width: 680px; margin: 0 auto; }
.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.2rem); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 1.25rem;
}
.hero p {
  color: var(--text-muted); font-size: 1.1rem; line-height: 1.7;
  max-width: 560px; margin: 0 auto 2.5rem;
}

.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 2.5rem;
}
.stat-item { display: flex; flex-direction: column; align-items: center; gap: 0.15rem; }
.stat-num { font-size: 1.8rem; font-weight: 700; color: var(--accent); line-height: 1; }
.stat-label { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; }

/* ── Courses ── */
.courses-section { max-width: 1100px; margin: 0 auto; padding: 0 2rem 5rem; }
.courses-section h2 {
  font-size: 0.85rem; font-weight: 600; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1.75rem;
}
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; }

.course-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 1.5rem; transition: all var(--transition);
  display: flex; flex-direction: column; gap: 0.75rem;
  position: relative; overflow: hidden; color: var(--text); cursor: pointer;
}
.course-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--card-color, var(--accent)); opacity: 0; transition: opacity var(--transition);
}
.course-card:hover {
  border-color: var(--border-focus); background: var(--bg-card-hover);
  transform: translateY(-4px); box-shadow: var(--shadow);
  color: var(--text);
}
.course-card:hover::before { opacity: 1; }

.card-top { display: flex; align-items: center; justify-content: space-between; }
.card-num { font-size: 0.8rem; color: var(--text-muted); font-weight: 600; font-family: var(--font-mono); }
.course-card .badge {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.8rem; color: white; flex-shrink: 0;
}
.course-card h3 { font-size: 1.05rem; font-weight: 600; line-height: 1.35; }
.card-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.55; flex-grow: 1; }
.card-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 0.75rem; border-top: 1px solid var(--border); margin-top: 0.25rem;
}
.card-chapters { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; }
.card-cta {
  font-size: 0.8rem; color: var(--accent); font-weight: 600;
  transition: all var(--transition);
}
.course-card:hover .card-cta { color: var(--accent-hover); }

/* ── Downloads page ── */
.downloads-hero { padding: 4rem 2rem 3rem; text-align: center; }
.downloads-hero h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; margin-bottom: 0.75rem; }
.downloads-hero p { color: var(--text-muted); font-size: 1.15rem; max-width: 540px; margin: 0 auto; }
.downloads-content { max-width: 720px; margin: 0 auto; padding: 0 2rem 4rem; }
.download-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 2rem; margin-bottom: 1.5rem; display: flex; align-items: flex-start; gap: 1.5rem;
  transition: border-color var(--transition);
}
.download-card:hover { border-color: var(--border-focus); }
.download-card .icon {
  width: 52px; height: 52px; border-radius: var(--radius);
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center; font-size: 1.5rem; flex-shrink: 0;
}
.download-card h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.35rem; }
.download-card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; }
.download-card code { font-family: var(--font-mono); font-size: 0.85em; background: var(--bg-elevated); padding: 0.15em 0.4em; border-radius: 4px; }
.download-btn {
  display: inline-block; margin-top: 0.75rem; padding: 0.5rem 1rem;
  background: var(--accent); color: var(--bg); font-weight: 600; font-size: 0.9rem;
  border-radius: 8px; transition: all var(--transition);
}
.download-btn:hover { background: var(--accent-hover); color: var(--bg); }
.downloads-note { color: var(--text-muted); font-size: 0.95rem; text-align: center; padding: 1.5rem; }

/* ── Search overlay ── */
.search-overlay {
  position: fixed; inset: 0;
  background: rgba(10, 14, 20, 0.96); backdrop-filter: blur(8px);
  z-index: 200; display: none; padding: 3rem 2rem; overflow-y: auto;
}
.search-overlay.open { display: block; }
.search-box { max-width: 640px; margin: 0 auto 2rem; }
.search-box input {
  width: 100%; padding: 1rem 1.25rem; font: inherit; font-size: 1.1rem;
  background: var(--bg-elevated); border: 2px solid var(--border); border-radius: var(--radius);
  color: var(--text); transition: border-color var(--transition);
}
.search-box input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.search-box input::placeholder { color: var(--text-muted); opacity: 0.7; }

.search-close {
  position: absolute; top: 1.5rem; right: 2rem;
  padding: 0.45rem 0.9rem; background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font: inherit; font-size: 0.85rem; font-weight: 500;
  cursor: pointer; transition: all var(--transition);
}
.search-close:hover { border-color: var(--accent); color: var(--accent); }

.search-status { color: var(--text-muted); padding: 1.5rem; text-align: center; }
.search-results { max-width: 640px; margin: 0 auto; }
.search-result-item {
  padding: 0.85rem 1rem; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 0.75rem;
  color: inherit; transition: background var(--transition); font-size: 0.9rem;
}
.search-result-item:hover { background: var(--bg-elevated); color: var(--text); }
.result-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 24px; border-radius: 4px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 0.7rem; font-weight: 700; flex-shrink: 0;
}
.result-text { display: flex; flex-direction: column; gap: 0.1rem; min-width: 0; }
.result-text strong { font-size: 0.85rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result-text span { font-size: 0.8rem; color: var(--text-muted); }

/* ── Footer ── */
.site-footer { padding: 2rem; text-align: center; color: var(--text-muted); font-size: 0.85rem; border-top: 1px solid var(--border); }
.site-footer a { color: var(--accent); }
.site-footer a:hover { color: var(--accent-hover); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .site-header { padding: 0.75rem 1rem; }
  .site-header .inner { gap: 1rem; flex-wrap: wrap; }
  .nav-links { order: 3; width: 100%; justify-content: center; gap: 1.25rem; }
  .header-actions { margin-left: auto; }
  .hero { padding: 3.5rem 1.5rem 3rem; }
  .hero h1 { font-size: clamp(1.8rem, 5vw, 2.5rem); }
  .hero-stats { gap: 1.5rem; }
  .course-grid { grid-template-columns: 1fr; }
  .search-close { top: 1rem; right: 1rem; }
}
@media (max-width: 480px) {
  .search-btn span { display: none; }
  .hero p { font-size: 1rem; }
}