:root {
    --bg-deep: #05070a;
    --bg-sidebar: #0a0d12;
    --accent-cyan: #00d2ff;
    --accent-purple: #7b2ff7;
    --accent-orange: #ff8c00;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --sidebar-width: 260px;
    --right-panel-width: 340px;
    --neon-shadow-cyan: 0 0 20px rgba(0, 210, 255, 0.3);
    --neon-shadow-purple: 0 0 20px rgba(123, 47, 247, 0.3);
}

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

body {
    background-color: var(--bg-deep);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
    background: radial-gradient(circle at 50% 50%, #0d1421 0%, #05070a 100%);
}

/* Left Sidebar */
.sidebar-left {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 2rem 1rem;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 8px;
    position: relative;
    box-shadow: var(--neon-shadow-cyan);
}

.logo-icon::after {
    content: '';
    position: absolute;
    inset: 6px;
    border: 2px solid white;
    border-radius: 4px;
    opacity: 0.5;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.nav-item i {
    width: 20px;
}

.nav-item:hover, .nav-item.active {
    background: var(--glass-bg);
    color: var(--text-primary);
}

.nav-item.active {
    background: linear-gradient(90deg, rgba(0, 210, 255, 0.1) 0%, transparent 100%);
    border-left: 3px solid var(--accent-cyan);
    color: var(--accent-cyan);
}

.sidebar-bottom {
    margin-top: auto;
    background: var(--glass-bg);
    border-radius: 20px;
    padding: 1.25rem;
    border: 1px solid var(--glass-border);
}

.profile-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.profile-img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: #1e293b;
}

.profile-info {
    display: flex;
    flex-direction: column;
}

.profile-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.profile-level {
    font-size: 0.75rem;
    color: var(--accent-cyan);
}

.xp-bar-container {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.xp-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    box-shadow: 0 0 10px var(--accent-cyan);
}

.today-goal {
    font-size: 0.8rem;
}

.goal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.goal-fire {
    display: flex;
    gap: 2px;
}

.goal-fire i {
    width: 14px;
    height: 14px;
    color: var(--accent-orange);
    fill: var(--accent-orange);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1.5rem 2rem;
    overflow-y: auto;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.search-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.75rem 1.25rem;
    border-radius: 14px;
    width: 400px;
}

.search-container input {
    background: none;
    border: none;
    color: white;
    width: 100%;
    outline: none;
}

.icon-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: white;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.3s;
}

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

/* Visualizer Section */
.visualizer-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.visualizer-header h2 {
    font-size: 2rem;
    font-weight: 700;
}

.visualizer-header p {
    color: var(--text-secondary);
}

.model-container {
    position: relative;
    flex: 1;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 30px;
    border: 1px solid var(--glass-border);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
}

.main-model-img {
    width: 90%;
    height: 90%;
    object-fit: contain;
    filter: drop-shadow(0 0 50px rgba(0, 210, 255, 0.2));
}

.layers-panel {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    background: rgba(10, 13, 18, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 1.25rem;
    width: 200px;
    z-index: 5;
}

.layers-panel h3 {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.layer-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
}

.layer-item i {
    width: 16px;
    height: 16px;
    cursor: pointer;
    color: var(--text-secondary);
}

.layer-item i.active {
    color: var(--accent-cyan);
}

.show-all {
    width: 100%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 0.5rem;
    border-radius: 8px;
    margin-top: 0.5rem;
    cursor: pointer;
}

.model-controls {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(10, 13, 18, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 0.75rem;
    border-radius: 18px;
    display: flex;
    gap: 1rem;
}

.model-controls button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: 0.3s;
}

.model-controls button:hover {
    background: var(--glass-bg);
    color: white;
}

.ar-btn {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple)) !important;
    color: white !important;
}

/* Simulations Section */
.bottom-simulations {
    margin-top: 1rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header a {
    color: var(--accent-cyan);
    text-decoration: none;
    font-size: 0.9rem;
}

.sim-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.sim-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    overflow: hidden;
    cursor: pointer;
    transition: 0.3s;
}

.sim-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
}

.sim-thumb {
    height: 120px;
    position: relative;
    overflow: hidden;
}

.sim-thumb img {
    width: 200%;
    height: 200%;
    object-fit: cover;
}

.sim-img-crop-1 { object-position: 0 0; }
.sim-img-crop-2 { object-position: 100% 0; }
.sim-img-crop-3 { object-position: 0 100%; }

.play-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: 0.3s;
}

.sim-card:hover .play-overlay {
    opacity: 1;
}

.play-overlay i {
    width: 32px;
    height: 32px;
    background: white;
    color: black;
    border-radius: 50%;
    padding: 6px;
}

.sim-info {
    padding: 1rem;
}

.sim-info h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.sim-info span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Right Sidebar */
.sidebar-right {
    width: var(--right-panel-width);
    background: var(--bg-sidebar);
    border-left: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    gap: 2rem;
    overflow-y: auto;
}

.details-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 1.5rem;
}

.details-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.tabs {
    display: flex;
    background: rgba(0,0,0,0.3);
    padding: 4px;
    border-radius: 10px;
    margin-bottom: 1.5rem;
}

.tab {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem;
    font-size: 0.8rem;
    border-radius: 8px;
    cursor: pointer;
}

.tab.active {
    background: var(--glass-bg);
    color: white;
    border: 1px solid var(--glass-border);
}

.isolated-render {
    width: 100%;
    height: 200px;
    background: rgba(0,0,0,0.5);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.isolated-render img {
    width: 80%;
    height: 80%;
    object-fit: contain;
    z-index: 2;
}

.render-glow {
    position: absolute;
    width: 100px;
    height: 100px;
    background: var(--accent-orange);
    filter: blur(60px);
    opacity: 0.3;
}

.details-content h4 {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.details-content ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.details-content li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
}

.details-content li i {
    width: 16px;
    height: 16px;
    color: var(--accent-cyan);
}

.ask-ai-btn {
    width: 100%;
    background: var(--glass-bg);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 0.85rem;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: 0.3s;
}

.ask-ai-btn:hover {
    background: var(--accent-cyan);
    color: black;
}

.ai-suggestion-card {
    background: linear-gradient(135deg, rgba(123, 47, 247, 0.1) 0%, rgba(0, 210, 255, 0.1) 100%);
    border: 1px solid var(--accent-purple);
    border-radius: 24px;
    padding: 1.5rem;
    margin-top: auto;
}

.suggestion-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.mascot-img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-deep);
}

.suggestion-bubble {
    font-size: 0.8rem;
    line-height: 1.4;
    background: rgba(255,255,255,0.05);
    padding: 0.75rem;
    border-radius: 12px;
}

.start-lesson-btn {
    width: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    border: none;
    color: white;
    padding: 1rem;
    border-radius: 14px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--neon-shadow-purple);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}