:root {
    --bg-color: #0b0f19;
    --card-bg: #151c2e;
    --primary: #00f2fe;
    --secondary: #4facfe;
    --accent: #ff007f;
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --border: #232d45;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text);
    padding-bottom: 50px;
}

/* NAVBAR */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #0d1322;
    padding: 15px 30px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.3rem;
    color: var(--primary);
}

.logo b {
    color: var(--accent);
}

.nav-links button {
    background: none;
    border: none;
    color: var(--text);
    margin-left: 15px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: 0.3s;
}

.nav-links button:hover {
    color: var(--primary);
}

/* LAYOUT & CARDS */
.container {
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.hidden {
    display: none !important;
}

.tech-title {
    font-family: 'Orbitron', sans-serif;
    color: var(--primary);
    margin-bottom: 15px;
    letter-spacing: 1px;
}

/* BUTTONS & FORMS */
.btn-primary {
    background: linear-gradient(45deg, var(--secondary), var(--primary));
    color: #000;
    font-weight: 600;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.3s;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-alt {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dim);
}

input[type="text"], input[type="password"], select, textarea {
    width: 100%;
    padding: 12px;
    background: #0d1322;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 6px;
}

/* PROGRESS BAR */
.progress-box {
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: #0d1322;
    border-radius: 6px;
    overflow: hidden;
    margin: 8px 0;
}

.progress-bar div {
    height: 100%;
    background: var(--primary);
    transition: width 0.4s ease;
}

/* TAB MATERI */
.tab-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    overflow-x: auto;
}

.tab-btn {
    background: #0d1322;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    white-space: nowrap;
}

.tab-btn.active {
    background: var(--primary);
    color: #000;
    font-weight: 600;
}

.tab-body {
    min-height: 250px;
    line-height: 1.6;
}

.nav-controls {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

/* SIMULASI CANVAS */
.sim-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

@media (max-width: 768px) {
    .sim-container {
        grid-template-columns: 1fr;
    }
}

.canvas-wrapper {
    display: flex;
    justify-content: center;
    background: #0d1322;
    border-radius: 8px;
    padding: 10px;
}

canvas {
    background: #080c14;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.info-card {
    background: #0d1322;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    border-left: 4px solid var(--primary);
}

.score-display {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin: 10px 0;
}

.quiz-item {
    background: #0d1322;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

/* DASHBOARD & TABLE */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.data-table th, .data-table td {
    border: 1px solid var(--border);
    padding: 10px;
    text-align: left;
    font-size: 0.85rem;
}

.data-table th {
    background: #0d1322;
    color: var(--primary);
}

/* MODAL */
.modal {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
}

.modal-content {
    width: 100%;
    max-width: 400px;
}

.pass-wrapper {
    display: flex;
}

.pass-wrapper button {
    background: #0d1322;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0 10px;
    cursor: pointer;
}