/* GURO Virtual Labs - VR/AR Ready Interface */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #131829;
    --bg-tertiary: #1a1f35;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --border-color: rgba(59, 130, 246, 0.2);
    --glass-bg: rgba(26, 31, 53, 0.7);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);
}

body {
    font-family: 'Inter', 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #0a0e1a 0%, #1a1f35 100%);
    color: var(--text-primary);
    overflow-x: hidden;
}

/* Header */
.vr-header {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1800px;
    margin: 0 auto;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.logo-mark {
    width: 36px;
    height: 36px;
    border-radius: 9px;
    background: linear-gradient(135deg, #4FB1FF 0%, #00D9A5 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-mark::before {
    content: 'G';
    font-family: 'Inter', sans-serif;
    font-weight: 800;
    font-size: 18px;
    color: #0C1118;
}

.logo-wordmark {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--text-primary);
}

.logo-subtitle {
    font-size: 0.55rem;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 1.5px;
}

.vr-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-left: 0.5rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--border-color);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

.header-btn {
    padding: 0.625rem 1.25rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.header-btn:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.vr-btn {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(59, 130, 246, 0.2));
}

.ar-btn {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(59, 130, 246, 0.2));
}

/* Main Container */
.main-container {
    display: grid;
    grid-template-columns: 280px 320px 1fr;
    height: calc(100vh - 80px);
    max-width: 1800px;
    margin: 0 auto;
    gap: 1rem;
    padding: 1rem;
}

/* Subject Panel */
.subject-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    overflow-y: auto;
}

.panel-header {
    margin-bottom: 1.5rem;
}

.panel-header h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.panel-header p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.subject-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.subject-card {
    padding: 1rem;
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.subject-card:hover {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-glow);
    transform: translateX(5px);
}

.subject-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.subject-icon {
    font-size: 1.75rem;
}

.subject-card h3 {
    font-size: 1rem;
    font-weight: 600;
}

.subject-card p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.subject-badges {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge {
    padding: 0.25rem 0.5rem;
    background: rgba(59, 130, 246, 0.2);
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
}

.badge.vr {
    background: rgba(139, 92, 246, 0.2);
    color: #a78bfa;
}

.badge.ar {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
}

/* Stats Box */
.stats-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
}

.stats-box h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-blue);
}

/* Experiment Panel */
.experiment-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    overflow-y: auto;
    display: none;
}

.experiment-panel.active {
    display: block;
}

.back-btn {
    padding: 0.5rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: rgba(59, 130, 246, 0.2);
    transform: translateX(-3px);
}

.experiment-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.experiment-card {
    padding: 1.25rem;
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.experiment-card:hover {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-glow);
}

.experiment-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.experiment-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.experiment-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.difficulty-badge {
    padding: 0.25rem 0.625rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty-badge.beginner {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
}

.difficulty-badge.intermediate {
    background: rgba(251, 191, 36, 0.2);
    color: #fcd34d;
}

.difficulty-badge.advanced {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

/* Lab Environment */
.lab-environment {
    position: relative;
    background: radial-gradient(circle at center, #1a1f35 0%, #0a0e1a 100%);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.welcome-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(10, 14, 26, 0.95), rgba(26, 31, 53, 0.95));
    backdrop-filter: blur(10px);
    z-index: 10;
}

.welcome-screen.hidden {
    display: none;
}

.welcome-content {
    text-align: center;
    max-width: 900px;
    padding: 2rem;
}

.welcome-content h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.feature-highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature-card {
    padding: 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.start-btn {
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.start-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.5);
}

/* 3D Canvas */
.lab-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Lab Controls */
.lab-controls {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    right: 1rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    max-height: 400px;
    overflow-y: auto;
}

.lab-controls.hidden {
    display: none;
}

.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.controls-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.close-experiment-btn {
    padding: 0.5rem 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 6px;
    color: var(--accent-red);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.close-experiment-btn:hover {
    background: rgba(239, 68, 68, 0.2);
}

.control-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem;
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

.tab-content {
    display: none;
}

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

.procedure-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.procedure-step {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 8px;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: var(--accent-blue);
    border-radius: 50%;
    font-weight: 700;
    flex-shrink: 0;
}

.interactive-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-item {
    padding: 1rem;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 8px;
}

.control-item label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.control-item input[type="range"] {
    width: 100%;
    margin-bottom: 0.5rem;
}

.control-value {
    text-align: right;
    color: var(--accent-blue);
    font-weight: 600;
}

.control-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.action-btn {
    flex: 1;
    padding: 0.875rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: rgba(59, 130, 246, 0.2);
    transform: translateY(-2px);
}

.action-btn.primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border-color: transparent;
    color: white;
}

.action-btn.success {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    border-color: transparent;
    color: white;
}

/* HUD Overlay */
.hud-overlay {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.hud-overlay.hidden {
    display: none;
}

.hud-item {
    padding: 0.75rem 1rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    min-width: 200px;
}

.hud-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.hud-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.mode-badge {
    padding: 0.25rem 0.75rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-close {
    padding: 0.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: var(--text-primary);
}

.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-container {
        grid-template-columns: 250px 1fr;
    }

    .experiment-panel {
        position: absolute;
        top: 0;
        left: 0;
        width: 350px;
        height: 100%;
        z-index: 20;
    }
}

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

    .subject-panel {
        position: absolute;
        left: -280px;
        height: 100%;
        z-index: 20;
        transition: left 0.3s ease;
    }

    .subject-panel.active {
        left: 0;
    }

    .feature-highlights {
        grid-template-columns: 1fr 1fr;
    }
}