* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #0f172a; --bg-2: #1e293b; --bg-3: #334155;
  --text: #f1f5f9; --text-2: #94a3b8; --text-3: #64748b;
  --accent: #3b82f6; --accent-2: #2563eb;
  --border: #334155;
  --green: #22c55e; --red: #ef4444; --yellow: #eab308;
}
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.app { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: var(--bg-2); border-right: 1px solid var(--border); padding: 1rem 0; display: flex; flex-direction: column; position: fixed; top: 0; bottom: 0; }
.sidebar-brand { padding: 0 1rem 1rem; font-weight: 700; font-size: 1.1rem; border-bottom: 1px solid var(--border); margin-bottom: 0.5rem; }
.nav-link { display: block; padding: 0.5rem 1rem; color: var(--text-2); font-size: 0.875rem; }
.nav-link:hover { background: var(--bg-3); color: var(--text); text-decoration: none; }
.nav-spacer { flex: 1; }
.nav-user { padding: 0.5rem 1rem; color: var(--text-3); font-size: 0.75rem; }
.nav-logout { color: var(--red); }

.content { flex: 1; margin-left: 220px; padding: 2rem; }

.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.page-header h1 { font-size: 1.5rem; }

.card { background: var(--bg-2); border: 1px solid var(--border); border-radius: 0.5rem; padding: 1.25rem; margin-bottom: 1rem; }
.card h3 { margin-bottom: 0.5rem; }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.stat-card { background: var(--bg-2); border: 1px solid var(--border); border-radius: 0.5rem; padding: 1.25rem; text-align: center; }
.stat-card .value { font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-card .label { font-size: 0.75rem; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 0.25rem; }

.btn { display: inline-block; padding: 0.5rem 1rem; border-radius: 0.375rem; font-size: 0.875rem; font-weight: 500; cursor: pointer; border: none; text-decoration: none; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-2); }
.btn-danger { background: var(--red); color: white; }
.btn-danger:hover { opacity: 0.9; }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.75rem; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-2); }
.btn-outline:hover { border-color: var(--text-2); color: var(--text); }

.badge { display: inline-block; padding: 0.125rem 0.5rem; border-radius: 9999px; font-size: 0.7rem; font-weight: 600; text-transform: uppercase; }
.badge-green { background: rgba(34,197,94,0.15); color: var(--green); }
.badge-yellow { background: rgba(234,179,8,0.15); color: var(--yellow); }
.badge-gray { background: rgba(100,116,139,0.15); color: var(--text-3); }
.badge-blue { background: rgba(59,130,246,0.15); color: var(--accent); }
.badge-purple { background: rgba(168,85,247,0.15); color: #a855f7; }
.badge-orange { background: rgba(249,115,22,0.15); color: #f97316; }

.btn-icon { background: none; border: 1px solid var(--border); color: var(--text-3); width: 22px; height: 18px; border-radius: 3px; font-size: 0.7rem; cursor: pointer; display: flex; align-items: center; justify-content: center; padding: 0; line-height: 1; }
.btn-icon:hover { border-color: var(--text-2); color: var(--text); }
.btn-icon:disabled { opacity: 0.3; cursor: default; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.75rem; border-bottom: 1px solid var(--border); font-size: 0.875rem; }
th { color: var(--text-3); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
tr:hover { background: var(--bg-3); }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.75rem; color: var(--text-3); margin-bottom: 0.25rem; text-transform: uppercase; letter-spacing: 0.05em; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 0.5rem 0.75rem; border: 1px solid var(--border); border-radius: 0.375rem;
  background: var(--bg); color: var(--text); font-size: 0.875rem;
}
.form-group textarea { min-height: 120px; resize: vertical; font-family: inherit; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); }

.form-actions { display: flex; gap: 0.5rem; margin-top: 1.5rem; }

.alert { padding: 0.75rem 1rem; border-radius: 0.375rem; font-size: 0.875rem; margin-bottom: 1rem; }
.alert-error { background: rgba(239,68,68,0.15); color: var(--red); border: 1px solid rgba(239,68,68,0.3); }
.alert-success { background: rgba(34,197,94,0.15); color: var(--green); border: 1px solid rgba(34,197,94,0.3); }

.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-box { background: var(--bg-2); border: 1px solid var(--border); border-radius: 0.5rem; padding: 2rem; width: 360px; }
.login-box h1 { text-align: center; margin-bottom: 1.5rem; font-size: 1.25rem; }
.login-box .btn { width: 100%; text-align: center; }

/* ── Public pages ──────────────────────────────────────────────────── */
.public-page { min-height: 100vh; display: flex; flex-direction: column; }

.public-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 2rem; border-bottom: 1px solid var(--border); background: var(--bg-2);
  position: sticky; top: 0; z-index: 10;
}
.public-nav-brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.public-nav-brand:hover { text-decoration: none; }
.public-nav-right { display: flex; gap: 0.5rem; align-items: center; }

.hero {
  background: linear-gradient(135deg, var(--bg-2) 0%, #1a2744 50%, var(--bg-2) 100%);
  border-bottom: 1px solid var(--border);
  padding: 4rem 2rem;
  text-align: center;
}
.hero-inner { max-width: 600px; margin: 0 auto; }
.hero h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 0.75rem; }
.hero-sub { color: var(--text-2); font-size: 1.05rem; line-height: 1.6; margin-bottom: 1.5rem; }

.public-content { flex: 1; padding: 2rem; max-width: 1100px; margin: 0 auto; width: 100%; }

.search-form { display: flex; gap: 0.5rem; margin-bottom: 2rem; max-width: 500px; }
.search-input {
  flex: 1; padding: 0.5rem 0.75rem; border: 1px solid var(--border); border-radius: 0.375rem;
  background: var(--bg-2); color: var(--text); font-size: 0.875rem;
}
.search-input:focus { outline: none; border-color: var(--accent); }

.section { margin-bottom: 2.5rem; }
.section-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 1rem; }

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}
.course-card {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: 0.5rem;
  overflow: hidden; text-decoration: none; color: var(--text);
  transition: border-color 0.15s, transform 0.15s;
  display: flex; flex-direction: column;
}
.course-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }

.course-cover {
  height: 140px; background-size: cover; background-position: center; background-color: var(--bg-3);
}
.course-cover-placeholder {
  background: linear-gradient(135deg, var(--bg-3) 0%, #2a3a52 100%);
}
.course-body { padding: 1rem; flex: 1; display: flex; flex-direction: column; }
.course-meta { display: flex; gap: 0.25rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
.course-title { font-size: 1rem; font-weight: 600; margin-bottom: 0.375rem; }
.course-desc { font-size: 0.8rem; color: var(--text-2); line-height: 1.4; flex: 1; }
.course-footer {
  display: flex; justify-content: space-between; margin-top: 0.75rem; padding-top: 0.5rem;
  border-top: 1px solid var(--border); font-size: 0.7rem; color: var(--text-3);
}

.company-row { display: flex; gap: 1rem; overflow-x: auto; padding-bottom: 0.5rem; }
.company-card {
  flex-shrink: 0; width: 200px; padding: 1.25rem;
  background: var(--bg-2); border: 1px solid var(--border); border-radius: 0.5rem;
  text-decoration: none; color: var(--text); text-align: center;
  transition: border-color 0.15s;
}
.company-card:hover { border-color: var(--accent); text-decoration: none; }
.company-name { font-weight: 600; font-size: 0.9rem; margin-bottom: 0.25rem; }
.company-count { font-size: 0.75rem; color: var(--text-3); }

.category-pills { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.category-pill {
  padding: 0.375rem 1rem; border-radius: 9999px; font-size: 0.8rem;
  background: var(--bg-2); border: 1px solid var(--border); color: var(--text-2);
  text-decoration: none; transition: all 0.15s;
}
.category-pill:hover { border-color: var(--accent); color: var(--text); text-decoration: none; }
.category-pill.active { background: var(--accent); border-color: var(--accent); color: white; }

.preview-cover {
  width: 100%; height: 300px; background-size: cover; background-position: center;
  border-radius: 0.5rem; margin-bottom: 1.5rem; background-color: var(--bg-3);
}

.preview-banner {
  margin-top: 2rem; padding: 2rem; text-align: center;
  background: linear-gradient(135deg, rgba(59,130,246,0.1) 0%, rgba(34,197,94,0.1) 100%);
  border: 1px solid rgba(59,130,246,0.2); border-radius: 0.5rem;
}
.preview-banner-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.preview-banner h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.preview-banner p { font-size: 0.875rem; color: var(--text-2); max-width: 500px; margin: 0 auto; line-height: 1.5; }

.lesson-list { padding-left: 1.25rem; }
.lesson-list li { padding: 0.5rem 0; font-size: 0.875rem; color: var(--text-2); border-bottom: 1px solid var(--border); }
.lesson-list li:last-child { border-bottom: none; }

.empty-text { color: var(--text-3); font-size: 0.875rem; }

.public-footer {
  padding: 1.5rem 2rem; text-align: center; border-top: 1px solid var(--border);
  font-size: 0.75rem; color: var(--text-3);
}

@media (max-width: 768px) {
  .public-nav { padding: 0.75rem 1rem; }
  .public-content { padding: 1.5rem 1rem; }
  .hero { padding: 3rem 1.5rem; }
  .hero h1 { font-size: 1.75rem; }
  .course-grid { grid-template-columns: 1fr; }
  .company-row { gap: 0.75rem; }
  .company-card { width: 160px; }
}