:root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --accent-blue: #0ea5e9;
    --accent-purple: #8b5cf6;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-line: #334155;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-family);
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: rgba(30, 41, 59, 0.9);
    border-bottom: 1px solid var(--border-line);
}

.logo {
    font-size: 1.4rem;
    font-weight: bold;
}

.highlight {
    color: var(--accent-blue);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
}

.container {
    padding: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-line);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
}

.section-card, .info-card, .sim-card, .case-card, .question-card, .auth-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-line);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 1rem;
}

.auth-card {
    max-width: 400px;
    margin: 3rem auto;
}

.input-group {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group input, .input-group select, textarea {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-line);
    color: white;
    padding: 0.75rem;
    border-radius: 6px;
    width: 100%;
}

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

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

.data-table th {
    background-color: var(--bg-card);
    color: var(--accent-blue);
}

.score-display-card {
    text-align: center;
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--accent-blue);
    margin-top: 2rem;
}

.score-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--accent-blue);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.rotasi-court {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    background: #064e3b;
    padding: 10px;
    border-radius: 8px;
    margin-top: 1rem;
    text-align: center;
}

.player-node {
    background: var(--bg-card);
    padding: 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
}

.progress-bar-bg {
    width: 100%;
    height: 8px;
    background-color: var(--border-line);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--accent-blue);
}

.materi-tabs {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    overflow-x: auto;
}

.tab-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-line);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    white-space: nowrap;
}

.tab-btn.active {
    background-color: var(--accent-blue);
    color: white;
}

.materi-sub-page { display: none; }
.materi-sub-page.active { display: block; margin-top: 1rem; }
.materi-nav-bottom { display: flex; justify-content: space-between; margin-top: 1rem; }
.sim-feedback { background: rgba(14, 165, 233, 0.1); border-left: 4px solid var(--accent-blue); padding: 0.8rem; border-radius: 4px; }
.w-100 { width: 100%; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.dashboard-header { display: flex; justify-content: space-between; align-items: center; }