:root {
    --bg-dark: #0b0f19;
    --card-bg: rgba(22, 31, 49, 0.75);
    --accent-gold: #f59e0b;
    --accent-cyan: #06b6d4;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --border-glow: rgba(6, 182, 212, 0.3);
}

body {
    margin: 0;
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    background-image: radial-gradient(circle at 50% 0%, rgba(6, 182, 212, 0.15), transparent 70%);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(11, 15, 25, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-glow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

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

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-weight: 600;
    transition: 0.3s;
}

.nav-btn:hover, .nav-btn.active {
    color: var(--accent-cyan);
    border-bottom: 2px solid var(--accent-cyan);
}

.page {
    display: none;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.page.active { display: block; }

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 3rem 1rem;
}

.badge-tag {
    display: inline-block;
    padding: 0.3rem 1rem;
    background: rgba(245, 158, 11, 0.2);
    color: var(--accent-gold);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 2.5rem;
    line-height: 1.2;
    background: linear-gradient(to right, #fff, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-card, .studi-kasus-card, .result-card, .refleksi-card {
    background: var(--card-bg);
    border: 1px solid var(--border-glow);
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    margin: 2rem auto;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

.input-group {
    margin-bottom: 1.2rem;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--text-muted);
}

.input-group input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    background: rgba(11, 15, 25, 0.8);
    border: 1px solid var(--border-glow);
    border-radius: 6px;
    color: #fff;
    box-sizing: border-box;
}

.btn-primary {
    width: 100%;
    padding: 0.8rem;
    background: linear-gradient(135deg, var(--accent-cyan), #0284c7);
    border: none;
    border-radius: 6px;
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
}

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

/* Layout Materi */
.materi-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
}

.sidebar-materi ul {
    list-style: none;
    padding: 0;
}

.sidebar-materi li {
    padding: 0.8rem;
    margin-bottom: 0.5rem;
    background: var(--card-bg);
    border-radius: 6px;
    cursor: pointer;
    border-left: 3px solid transparent;
}

.sidebar-materi li.active-sub {
    border-left-color: var(--accent-gold);
    background: rgba(245, 158, 11, 0.1);
}

.sim-box {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-glow);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.data-table th, .data-table td {
    padding: 0.8rem;
    border: 1px solid var(--border-glow);
    text-align: left;
}

.hidden { display: none !important; }
.score-display {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-gold);
    text-align: center;
    margin: 1rem 0;
}