:root {
    --primary-color: #059669;
    --primary-hover: #047857;
    --secondary-color: #0284c7;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #10b981;
    --danger-color: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

/* NAVBAR */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #090d16;
    padding: 15px 30px;
    border-bottom: 2px solid #1e293b;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.logo span {
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.user-info {
    display: flex;
    gap: 10px;
}

/* BUTTONS */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: 0.3s;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

.btn-login, .btn-guru {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
}

/* PAGES */
.main-container {
    padding: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* HERO SECTION */
.hero {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    padding: 40px 0;
}

.hero-text h1 {
    font-size: 2.5rem;
    margin: 15px 0;
    color: #ffffff;
}

.badge {
    background-color: #064e3b;
    color: #34d399;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.eco-card {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    display: flex;
    gap: 20px;
    font-size: 3rem;
    color: var(--accent-color);
    border: 1px solid #334155;
}

/* TUJUAN PEMBELAJARAN */
.tp-container {
    margin-top: 40px;
}

.tp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.tp-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    position: relative;
    border-left: 4px solid var(--accent-color);
}

.tp-num {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 1.5rem;
    font-weight: bold;
    color: #334155;
}

/* MATERI TAB */
.materi-tabs {
    display: flex;
    gap: 10px;
    margin: 20px 0;
}

.tab-btn {
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid #334155;
    padding: 10px 15px;
    border-radius: 6px;
    cursor: pointer;
}

.tab-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.materi-content-box {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    min-height: 300px;
}

.materi-tab-content {
    display: none;
}

.materi-tab-content.active {
    display: block;
}

.progress-bar-container {
    background-color: #334155;
    height: 8px;
    border-radius: 4px;
    margin-top: 10px;
    overflow: hidden;
}

.progress-bar {
    background-color: var(--accent-color);
    height: 100%;
    width: 25%;
    transition: 0.3s;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 15px;
}

.comp-card {
    padding: 20px;
    border-radius: 8px;
    background-color: #0f172a;
}

.comp-card.red { border-top: 4px solid var(--danger-color); }
.comp-card.green { border-top: 4px solid var(--accent-color); }

/* SIMULASI DRAG DROP */
.sim-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
}

.drag-items {
    display: flex;
    gap: 10px;
    margin: 15px 0;
    flex-wrap: wrap;
}

.drag-item {
    background-color: var(--secondary-color);
    padding: 8px 15px;
    border-radius: 4px;
    cursor: grab;
}

.drop-zones {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.drop-zone {
    background-color: #0f172a;
    border: 2px dashed #334155;
    padding: 20px;
    border-radius: 8px;
    min-height: 120px;
}

/* LAB VIRTUAL */
.lab-workspace {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #0f172a;
    padding: 20px;
    border-radius: 8px;
    margin-top: 15px;
}

.lab-selects {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 60%;
}

.lab-selects select {
    padding: 8px;
    background-color: var(--card-bg);
    color: white;
    border: 1px solid #334155;
    border-radius: 4px;
}

.light-bulb {
    font-size: 4rem;
    color: #334155;
    transition: 0.3s;
    text-align: center;
}

.light-bulb.on {
    color: #facc15;
    text-shadow: 0 0 20px #facc15;
}

/* FORM & QUIZ */
.form-group {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group input, .form-group select, .form-group textarea {
    padding: 10px;
    background-color: #0f172a;
    border: 1px solid #334155;
    color: white;
    border-radius: 4px;
}

.quiz-card {
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.score-display {
    font-size: 3rem;
    font-weight: bold;
    color: var(--accent-color);
    text-align: center;
    margin: 20px 0;
}

/* DASHBOARD TABLE */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    background-color: var(--card-bg);
}

.data-table th, .data-table td {
    padding: 12px;
    border: 1px solid #334155;
    text-align: left;
}

.data-table th {
    background-color: #0f172a;
}

/* MODAL */
.modal {
    display: none;
    position: fixed;
    top:0; left:0; width:100%; height:100%;
    background-color: rgba(0,0,0,0.7);
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    width: 90%;
    max-width: 400px;
    position: relative;
}

.close-btn {
    position: absolute;
    top: 10px; right: 15px;
    font-size: 1.5rem;
    cursor: pointer;
}

.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-wrapper input {
    width: 100%;
}

.password-wrapper i {
    position: absolute;
    right: 10px;
    cursor: pointer;
    color: var(--text-muted);
}