:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --secondary: #475569;
    --secondary-hover: #334155;
    --danger: #ef4444;
    --success: #22c55e;
    --border: #334155;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, -apple-system, sans-serif; }
body { background-color: var(--bg-color); color: var(--text-main); line-height: 1.5; padding: 1.5rem; }

#app { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; gap: 1.5rem; }

.header { display: flex; justify-content: space-between; align-items: center; background: var(--card-bg); padding: 1.5rem; border-radius: 12px; border: 1px solid var(--border); flex-wrap: wrap; gap: 1rem; }
.header h1 { font-size: 1.5rem; color: var(--text-main); }
.header p { color: var(--text-muted); font-size: 0.9rem; }
.header-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }

.btn { padding: 0.5rem 0.85rem; border-radius: 6px; border: none; font-weight: 600; cursor: pointer; transition: background 0.2s; font-size: 0.8rem; display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--secondary); color: white; }
.btn-secondary:hover { background: var(--secondary-hover); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn-danger:hover { background: var(--danger); color: white; }
.upload-label { cursor: pointer; }

.dashboard { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1rem; }
.card { background: var(--card-bg); padding: 1.25rem; border-radius: 12px; border: 1px solid var(--border); display: flex; flex-direction: column; gap: 0.75rem; }
.stat-card h3, .chart-card h3 { font-size: 1rem; color: var(--text-muted); }
.stat-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; justify-content: space-between; }

.progress-bar-container { background: var(--border); border-radius: 999px; height: 12px; overflow: hidden; width: 100%; }
.progress-bar { background: var(--success); height: 100%; transition: width 0.3s ease; }

.chart-container { position: relative; height: 180px; width: 100%; display: flex; justify-content: center; align-items: center; }

.career-section { background: var(--card-bg); padding: 1.25rem; border-radius: 12px; border: 1px solid var(--border); }
.career-section h3 { font-size: 1rem; margin-bottom: 0.75rem; }
.career-pills { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.pill { background: var(--border); color: var(--text-muted); border: none; padding: 0.4rem 0.8rem; border-radius: 999px; font-size: 0.85rem; cursor: pointer; transition: all 0.2s; }
.pill.active, .pill:hover { background: var(--accent); color: white; }
.career-desc { font-size: 0.85rem; color: var(--text-muted); }

.controls-section { display: flex; gap: 1rem; flex-wrap: wrap; }
.search-box { flex: 1; min-width: 250px; }
.search-box input, .filter-group select { width: 100%; padding: 0.6rem 1rem; background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text-main); font-size: 0.9rem; }

.curriculum-container { display: flex; flex-direction: column; gap: 1.5rem; }
.phase-card { background: var(--card-bg); border-radius: 12px; border: 1px solid var(--border); overflow: hidden; }
.phase-header { background: rgba(255,255,255,0.03); padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.phase-header h2 { font-size: 1.1rem; color: var(--text-main); }
.phase-header span { font-size: 0.85rem; color: var(--text-muted); }
.phase-desc-banner { padding: 0.6rem 1.25rem; background: rgba(59, 130, 246, 0.05); font-size: 0.82rem; color: var(--text-muted); border-bottom: 1px solid var(--border); }

.course-list { display: flex; flex-direction: column; }
.course-item { padding: 0.85rem 1.25rem; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 1rem; transition: background 0.15s; }
.course-item:last-child { border-bottom: none; }
.course-item:hover { background: rgba(255,255,255,0.02); }
.course-item.completed { opacity: 0.6; }
.course-item.completed .course-title { text-decoration: line-through; }
.course-item input[type="checkbox"] { width: 1.1rem; height: 1.1rem; accent-color: var(--success); cursor: pointer; }
.course-info { display: flex; flex-direction: column; flex: 1; cursor: pointer; }
.course-title { font-size: 0.95rem; font-weight: 500; }
.course-meta { font-size: 0.75rem; color: var(--text-muted); display: flex; gap: 0.75rem; margin-top: 0.15rem; align-items: center; }
.tag { background: rgba(59, 130, 246, 0.15); color: #60a5fa; padding: 0.1rem 0.4rem; border-radius: 4px; font-size: 0.7rem; }
.note-indicator { color: #f59e0b; font-size: 0.75rem; font-weight: 600; }
.info-btn { background: transparent; border: 1px solid var(--border); color: var(--text-muted); border-radius: 4px; padding: 0.2rem 0.5rem; font-size: 0.75rem; cursor: pointer; transition: all 0.2s; }
.info-btn:hover { background: var(--accent); color: white; border-color: var(--accent); }

.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.75); display: flex; justify-content: center; align-items: center; z-index: 1000; padding: 1rem; }
.modal-overlay.hidden { display: none; }
.modal-card { background: var(--card-bg); border: 1px solid var(--border); padding: 1.5rem; border-radius: 12px; width: 100%; max-width: 450px; display: flex; flex-direction: column; gap: 1rem; }
.course-modal-card { max-width: 600px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); padding-bottom: 0.75rem; }
.modal-header h3 { font-size: 1.2rem; }
.close-icon { background: none; border: none; color: var(--text-muted); font-size: 1.5rem; cursor: pointer; }
.modal-body { display: flex; flex-direction: column; gap: 1rem; max-height: 60vh; overflow-y: auto; padding-right: 0.25rem; }
.course-meta-details { display: flex; gap: 1rem; font-size: 0.85rem; color: var(--text-muted); }
.modal-desc { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }
.notes-section { display: flex; flex-direction: column; gap: 0.5rem; }
.notes-section textarea { width: 100%; min-height: 120px; background: var(--bg-color); border: 1px solid var(--border); border-radius: 8px; color: var(--text-main); padding: 0.75rem; font-size: 0.9rem; resize: vertical; }
.modal-actions { display: flex; justify-content: flex-end; gap: 0.5rem; border-top: 1px solid var(--border); padding-top: 0.75rem; }

.hidden-course { display: none !important; }