/* SATR page-specific styles — learn.html (loads before responsive.css) */

.learn-hero {
            background: linear-gradient(135deg, rgba(0,214,143,0.08) 0%, rgba(56,189,248,0.05) 50%, rgba(167,139,250,0.06) 100%);
            border: 1px solid rgba(0,214,143,0.15);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            margin-bottom: 36px;
            position: relative;
            overflow: hidden;
        }

.learn-hero::before {
            content: '';
            position: absolute; top: -80px; left: -80px;
            width: 320px; height: 320px;
            background: radial-gradient(circle, rgba(0,214,143,0.12) 0%, transparent 70%);
            pointer-events: none;
        }

.learn-hero::after {
            content: '';
            position: absolute; bottom: -60px; right: -60px;
            width: 250px; height: 250px;
            background: radial-gradient(circle, rgba(167,139,250,0.1) 0%, transparent 70%);
            pointer-events: none;
        }

.learn-hero-badge {
            display: inline-flex; align-items: center; gap: 8px;
            background: rgba(0,214,143,0.12); border: 1px solid rgba(0,214,143,0.3);
            color: var(--primary); font-size: 0.82rem; font-weight: 700;
            padding: 6px 14px; border-radius: var(--radius-full);
            margin-bottom: 20px;
        }

.learn-hero h1 {
            font-size: 2.8rem; font-weight: 900; line-height: 1.15;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff 40%, var(--primary) 100%);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
        }

.learn-hero p {
            font-size: 1.1rem; color: var(--text-secondary);
            max-width: 560px; line-height: 1.75; margin-bottom: 28px;
        }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 12px 24px; border-radius: var(--radius-full);
            font-weight: 700; font-size: 0.96rem;
            transition: all var(--transition); border: none;
        }

.btn-outline { background: transparent; color: var(--text-primary); border: 1px solid var(--border); }

.btn-outline:hover { background: var(--bg-hover); border-color: rgba(255,255,255,0.2); }

.hero-stats {
            display: flex; gap: 32px; margin-top: 32px; padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }

.hero-stat-val { font-size: 1.6rem; font-weight: 900; color: var(--primary); }

.hero-stat-lbl { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

.learn-search-wrap { position: relative; margin-bottom: 32px; }

.learn-search {
            width: 100%; background: var(--bg-surface);
            border: 1px solid var(--border); border-radius: var(--radius-lg);
            padding: 14px 20px 14px 52px;
            font-family: inherit; font-size: 1rem; color: var(--text-primary);
            outline: none; transition: all var(--transition);
        }

.learn-search::placeholder { color: var(--text-muted); }

.learn-search:focus { border-color: rgba(0,214,143,0.4); box-shadow: 0 0 0 3px rgba(0,214,143,0.08); }

.search-icon {
            position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
            color: var(--text-muted); font-size: 1.3rem; pointer-events: none;
        }

.search-results {
            position: absolute; top: calc(100% + 8px); left: 0; right: 0;
            background: var(--bg-surface); border: 1px solid var(--border);
            border-radius: var(--radius-lg); padding: 8px;
            z-index: 200; max-height: 360px; overflow-y: auto;
            box-shadow: 0 16px 40px rgba(0,0,0,0.5);
            display: none;
        }

.search-result-item {
            display: flex; align-items: center; gap: 12px;
            padding: 10px 12px; border-radius: var(--radius-md);
            transition: background var(--transition); cursor: pointer;
        }

.search-result-item:hover { background: var(--bg-hover); }

.search-result-icon {
            width: 36px; height: 36px; border-radius: var(--radius-sm);
            display: flex; align-items: center; justify-content: center;
            font-size: 1.3rem; flex-shrink: 0;
        }

.search-result-type { font-size: 0.72rem; color: var(--text-muted); }

.search-result-title { font-size: 0.92rem; font-weight: 600; }

.search-no-results { text-align: center; padding: 24px; color: var(--text-muted); }

.section-title {
            display: flex; align-items: center; justify-content: space-between;
            margin-bottom: 20px;
        }

.section-title h2 {
            font-size: 1.3rem; font-weight: 800;
            display: flex; align-items: center; gap: 10px;
        }

.section-title h2 i { color: var(--primary); }

.section-title a { font-size: 0.87rem; color: var(--primary); font-weight: 600; }

.section-title a:hover { opacity: 0.8; }

.category-filter {
            display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px;
        }

.cat-btn {
            display: flex; align-items: center; gap: 6px;
            padding: 8px 16px; border-radius: var(--radius-full);
            border: 1px solid var(--border); background: transparent;
            color: var(--text-secondary); font-size: 0.87rem; font-weight: 600;
            transition: all var(--transition); cursor: pointer;
        }

.cat-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

.cat-btn.active {
            background: var(--primary-dim); color: var(--primary);
            border-color: rgba(0,214,143,0.3);
        }

.tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }

.tech-card {
            background: var(--bg-surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition);
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

.tech-card::before {
            content: '';
            position: absolute; top: 0; right: 0; left: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--tech-color, var(--primary)), transparent);
            opacity: 0;
            transition: opacity var(--transition);
        }

.tech-card:hover { transform: translateY(-3px); border-color: rgba(255,255,255,0.15); box-shadow: 0 12px 32px rgba(0,0,0,0.4); }

.tech-card:hover::before { opacity: 1; }

.tech-card-header { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 16px; }

.tech-icon {
            width: 52px; height: 52px; border-radius: var(--radius-md);
            display: flex; align-items: center; justify-content: center;
            font-size: 1.8rem; flex-shrink: 0;
        }

.tech-name { font-size: 1.15rem; font-weight: 800; margin-bottom: 4px; }

.tech-tagline { font-size: 0.82rem; color: var(--text-muted); line-height: 1.4; }

.tech-difficulty {
            display: inline-flex; align-items: center; gap: 4px;
            font-size: 0.75rem; font-weight: 700; padding: 3px 10px;
            border-radius: var(--radius-full);
        }

.diff-beginner { background: rgba(0,214,143,0.12); color: var(--primary); }

.diff-intermediate { background: rgba(251,146,60,0.12); color: var(--orange); }

.diff-advanced { background: rgba(248,113,113,0.12); color: var(--red); }

.tech-meta {
            display: flex; align-items: center; gap: 16px;
            margin-bottom: 14px; flex-wrap: wrap;
        }

.tech-meta-item {
            display: flex; align-items: center; gap: 5px;
            font-size: 0.8rem; color: var(--text-secondary);
        }

.tech-meta-item i { font-size: 1rem; }

.tech-progress-bar {
            height: 4px; background: rgba(255,255,255,0.06);
            border-radius: 2px; overflow: hidden; margin-bottom: 10px;
        }

.tech-progress-fill {
            height: 100%; border-radius: 2px;
            background: linear-gradient(90deg, var(--primary), var(--blue));
            transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

.tech-progress-label { font-size: 0.78rem; color: var(--text-muted); }

.tech-card-footer {
            display: flex; align-items: center; justify-content: space-between;
            margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border-subtle);
        }

.featured-badge {
            display: inline-flex; align-items: center; gap: 4px;
            font-size: 0.72rem; font-weight: 700; padding: 3px 8px;
            border-radius: var(--radius-full);
            background: rgba(251,146,60,0.12); color: var(--orange);
            border: 1px solid rgba(251,146,60,0.25);
        }

.continue-section {
            background: linear-gradient(135deg, rgba(56,189,248,0.06) 0%, rgba(0,214,143,0.04) 100%);
            border: 1px solid rgba(56,189,248,0.15);
            border-radius: var(--radius-xl);
            padding: 28px;
            margin-bottom: 36px;
        }

.continue-item {
            display: flex; align-items: center; gap: 16px;
            padding: 16px; border-radius: var(--radius-lg);
            background: rgba(255,255,255,0.03);
            border: 1px solid var(--border-subtle);
            margin-top: 16px; transition: all var(--transition);
            cursor: pointer;
        }

.continue-item:hover { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.1); }

.continue-icon {
            width: 48px; height: 48px; border-radius: var(--radius-md);
            display: flex; align-items: center; justify-content: center;
            font-size: 1.6rem; flex-shrink: 0;
        }

.continue-tech { font-weight: 700; font-size: 0.92rem; }

.continue-lesson { font-size: 0.82rem; color: var(--text-secondary); margin-top: 2px; }

.continue-progress { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }

.continue-meta { flex: 1; min-width: 0; }

.empty-state {
            text-align: center; padding: 60px 24px; color: var(--text-muted);
        }

.empty-state i { font-size: 3.5rem; display: block; margin: 0 auto 16px; opacity: 0.4; }

.skeleton-card { height: 220px; border-radius: var(--radius-lg); }

@media (max-width: 900px) {
    .main-column { padding: 20px 16px; }
    .learn-hero h1 { font-size: 2rem; }
    .learn-hero { padding: 32px 24px; }
    .hero-stats { flex-wrap: wrap; gap: 20px; }
}