/* ==========================================================================
   CT-LAB: DARK THEME & NEON HIGHLIGHTS
   ========================================================================== */

:root {
  --bg-main: #0b0f19;
  --bg-card: #131b2e;
  --bg-glow: #1a243b;
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-purple: #7f00ff;
  --accent-green: #00e676;
  --accent-red: #ff5252;
  --border-color: rgba(0, 242, 254, 0.2);
  --font-family: 'Segoe UI', system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { background-color: var(--bg-main); color: var(--text-main); font-family: var(--font-family); line-height: 1.6; min-height: 100vh; }

.glow-box { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; box-shadow: 0 4px 20px rgba(0, 242, 254, 0.08); }

.navbar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 2rem; background: rgba(19, 27, 46, 0.95); position: sticky; top: 0; z-index: 100; border-bottom: 1px solid var(--border-color); }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.4rem; font-weight: 800; color: var(--accent-cyan); }
.nav-links { display: flex; gap: 8px; }
.nav-btn { background: transparent; border: none; color: var(--text-muted); padding: 8px 14px; border-radius: 6px; cursor: pointer; font-weight: 600; }
.nav-btn:hover, .nav-btn.active { color: #fff; background: var(--bg-glow); }

.user-profile { display: flex; align-items: center; gap: 10px; }
.badge { background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple)); padding: 4px 10px; border-radius: 20px; font-size: 0.8rem; font-weight: bold; }
.badge.success { background: var(--accent-green); color: #000; }

.app-container { max-width: 1200px; margin: 2rem auto; padding: 0 1rem; }
.page-section { animation: fadeIn 0.3s ease-in-out; }
.hidden { display: none !important; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

.auth-card { max-width: 420px; margin: 3rem auto; padding: 2rem; text-align: center; }
.auth-icon { font-size: 3rem; color: var(--accent-cyan); margin-bottom: 1rem; }
.form-group { margin-bottom: 1.2rem; text-align: left; }
.form-group label { display: block; margin-bottom: 6px; font-size: 0.9rem; color: var(--text-muted); }

input, select, textarea { width: 100%; padding: 10px 14px; background: #0b0f19; border: 1px solid var(--border-color); border-radius: 8px; color: #fff; }

.btn { padding: 10px 20px; border-radius: 8px; border: none; font-weight: 600; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; }
.btn-primary { background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue)); color: #0b0f19; }
.btn-secondary { background: var(--bg-glow); color: #fff; }
.btn-accent { background: var(--accent-purple); color: #fff; }
.btn-success { background: var(--accent-green); color: #000; }
.btn-danger { background: var(--accent-red); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-main); }
.btn-block { width: 100%; justify-content: center; }

.hero-banner { padding: 2.5rem; text-align: left; }
.hero-content h1 { font-size: 2.2rem; color: var(--accent-cyan); margin: 10px 0; }

.progress-bar-container { background: #000; height: 10px; border-radius: 5px; overflow: hidden; margin-top: 6px; }
.progress-bar-fill { background: var(--accent-cyan); height: 100%; transition: width 0.3s; }

.materi-nav-tabs { display: flex; gap: 8px; overflow-x: auto; margin-bottom: 1rem; }
.tab-btn { padding: 10px 16px; background: var(--bg-card); border: 1px solid var(--border-color); color: var(--text-muted); border-radius: 8px; cursor: pointer; white-space: nowrap; }
.tab-btn.active { background: var(--accent-cyan); color: #000; font-weight: bold; }
.materi-slide { display: none; }
.materi-slide.active { display: block; }

.simulasi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.card { background: var(--bg-card); padding: 1.5rem; border-radius: 10px; border: 1px solid var(--border-color); }

.feedback-msg { margin-top: 10px; padding: 8px; border-radius: 6px; font-size: 0.9rem; text-align: center; }
.feedback-msg.success { background: rgba(0, 230, 118, 0.2); color: var(--accent-green); }
.feedback-msg.error { background: rgba(255, 82, 82, 0.2); color: var(--accent-red); }

.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); backdrop-filter: blur(5px); display: flex; justify-content: center; align-items: center; z-index: 1000; }
.modal-card { background: var(--bg-card); padding: 2rem; border-radius: 12px; width: 90%; max-width: 450px; }
.modal-lg { max-width: 700px; }
.close-btn { background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

.table-responsive { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; text-align: left; }
.data-table th, .data-table td { padding: 12px; border-bottom: 1px solid var(--border-color); }
.data-table th { background: var(--bg-glow); color: var(--accent-cyan); }
.text-danger { color: var(--accent-red); }
.text-center { text-align: center; }

.p-2 { padding: 0.5rem; } .p-3 { padding: 1rem; } .p-4 { padding: 1.5rem; }
.mt-1 { margin-top: 0.25rem; } .mt-2 { margin-top: 0.5rem; } .mt-3 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; } .mb-3 { margin-bottom: 1rem; }