:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #0f1729;
    --bg-tertiary: #1a1f3a;
    --accent-cyan: #00f0ff;
    --accent-purple: #b537f2;
    --accent-pink: #ff006e;
    --accent-gold: #ffd700;
    --text-primary: #ffffff;
    --text-secondary: #b8c1ec;
    --text-muted: #6b7aa1;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background: #0a0e27;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 240, 255, 0.15), transparent),
        radial-gradient(circle at 100% 50%, rgba(181, 55, 242, 0.1), transparent 50%),
        radial-gradient(circle at 0% 50%, rgba(255, 0, 110, 0.08), transparent 50%),
        radial-gradient(circle at 50% 100%, rgba(181, 55, 242, 0.05), transparent 50%);
    z-index: 0;
    pointer-events: none;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

#neuralCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.6;
    pointer-events: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 10;
}

.glass {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* NAVIGATION */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.7);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-bottom: 1px solid rgba(0, 240, 255, 0.15);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    animation: slideDown 0.6s ease-out;
    transition: all 0.3s ease;
}

@keyframes slideDown {
    from { transform: translateY(-100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.5rem;
    cursor: pointer;
}

.logo-icon {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 2s ease-in-out infinite;
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.5));
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.logo-text {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    transition: width 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent-cyan);
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.cta-button, .theme-toggle {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border: none;
    border-radius: 12px;
    color: white;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
}

.theme-toggle {
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.cta-button:hover, .theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 240, 255, 0.5);
}

/* HERO */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2rem 4rem;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.3);
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--accent-cyan);
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 240, 255, 0.2);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
    box-shadow: 0 0 10px var(--accent-cyan);
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.title-line {
    display: block;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientFlow 3s ease infinite;
}

@keyframes gradientFlow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 4rem;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 240, 255, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(0, 240, 255, 0.3);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat {
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.3));
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-visual {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
}

.floating-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(40px);
    animation: float 6s ease-in-out infinite;
}

.orb-1 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--accent-cyan), transparent);
    opacity: 0.3;
    animation-delay: 0s;
}

.orb-2 {
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--accent-purple), transparent);
    opacity: 0.4;
    top: 100px;
    left: 100px;
    animation-delay: 2s;
}

.orb-3 {
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, var(--accent-pink), transparent);
    opacity: 0.3;
    top: -50px;
    left: -50px;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* SECTIONS */
section {
    position: relative;
    z-index: 10;
    padding: 6rem 0;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    margin-bottom: 1rem;
    line-height: 1.2;
    text-align: center;
}

.title-accent {
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* FEATURES */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    position: relative;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 2rem;
    transition: all 0.3s ease;
    overflow: hidden;
    cursor: pointer;
}

.feature-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.1), transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover .feature-glow {
    opacity: 1;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: rgba(0, 240, 255, 0.3);
    box-shadow: 0 20px 60px rgba(0, 240, 255, 0.2);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.3));
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* COURSES */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.course-card {
    position: relative;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 2rem;
    border: 2px solid transparent;
    transition: all 0.4s ease;
    cursor: pointer;
    overflow: hidden;
}

.course-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.15), transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.course-card:hover .course-glow {
    opacity: 1;
}

.course-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 25px 70px rgba(0, 240, 255, 0.3);
}

.course-card.level-beginner {
    border-color: rgba(0, 240, 255, 0.3);
}

.course-card.level-intermediate {
    border-color: rgba(181, 55, 242, 0.3);
}

.course-card.level-advanced {
    border-color: rgba(255, 0, 110, 0.3);
}

.course-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(0, 240, 255, 0.15);
    border: 1px solid rgba(0, 240, 255, 0.3);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
}

.course-card.level-intermediate .course-badge {
    background: rgba(181, 55, 242, 0.15);
    border-color: rgba(181, 55, 242, 0.3);
    color: var(--accent-purple);
}

.course-card.level-advanced .course-badge {
    background: rgba(255, 0, 110, 0.15);
    border-color: rgba(255, 0, 110, 0.3);
    color: var(--accent-pink);
}

.course-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.3));
}

.course-card h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.course-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.course-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

/* PAGE HEADER */
.page-header {
    padding: 10rem 0 4rem;
    text-align: center;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 900;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.progress-tracker {
    max-width: 600px;
    margin: 3rem auto 0;
    padding: 2rem;
    border-radius: 24px;
}

.progress-label {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.progress-bar-container {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 6px;
    transition: width 0.5s ease;
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
}

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

/* COURSES PAGE */
.courses-full {
    padding: 4rem 0;
}

.course-detail {
    margin-bottom: 6rem;
    padding: 3rem;
    border-radius: 24px;
    position: relative;
    overflow: hidden;
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.08), transparent 70%);
    opacity: 0.5;
}

.course-detail-header {
    margin-bottom: 3rem;
    position: relative;
    z-index: 1;
}

.course-detail-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 240, 255, 0.15);
    border: 1px solid rgba(0, 240, 255, 0.3);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
}

.course-detail.level-intermediate .course-detail-badge {
    background: rgba(181, 55, 242, 0.15);
    border-color: rgba(181, 55, 242, 0.3);
    color: var(--accent-purple);
}

.course-detail.level-advanced .course-detail-badge {
    background: rgba(255, 0, 110, 0.15);
    border-color: rgba(255, 0, 110, 0.3);
    color: var(--accent-pink);
}

.course-detail h2 {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 1rem;
}

.course-detail-header p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.course-modules {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 3rem;
    position: relative;
    z-index: 1;
}

.module {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    border-radius: 16px;
    transition: all 0.3s ease;
}

.module:hover {
    transform: translateX(8px);
    box-shadow: 0 10px 40px rgba(0, 240, 255, 0.2);
}

.module-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent-cyan);
    flex-shrink: 0;
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

.module-content {
    flex: 1;
}

.module-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.module-desc {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.module-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.topic-tag {
    padding: 0.4rem 0.8rem;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--accent-cyan);
}

/* PLAYGROUND */
.playground-section {
    padding: 8rem 0 4rem;
}

.playground-card {
    margin-bottom: 4rem;
    padding: 3rem;
    border-radius: 24px;
    position: relative;
    overflow: hidden;
}

.playground-header {
    margin-bottom: 2rem;
}

.playground-header h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 0.75rem;
}

.playground-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.playground-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2rem;
}

.playground-canvas-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.playground-canvas-container canvas {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 16px;
    cursor: crosshair;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.3);
}

.canvas-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.playground-info {
    padding: 2rem;
    border-radius: 16px;
}

.playground-info h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.info-grid, .settings-grid {
    display: grid;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}

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

.info-value {
    color: var(--accent-cyan);
    font-weight: 700;
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.setting-item input, .setting-item select {
    padding: 0.5rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
}

.training-progress {
    margin-top: 2rem;
}

/* VISUALIZER */
.visualizer-section {
    padding: 8rem 0 4rem;
}

.visualizer-card {
    margin-bottom: 4rem;
    padding: 3rem;
    border-radius: 24px;
    position: relative;
    overflow: hidden;
}

.visualizer-header {
    margin-bottom: 2rem;
}

.visualizer-header h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 0.75rem;
}

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

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

.architecture-controls {
    padding: 2rem;
    border-radius: 16px;
}

.architecture-controls h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.layer-config {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.config-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.config-item input, .config-item select {
    padding: 0.5rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
}

.network-stats {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(0, 240, 255, 0.05);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 16px;
}

.network-stats h4 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.architecture-visualization canvas {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 16px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.3);
}

.activation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.activation-function {
    padding: 1.5rem;
    border-radius: 16px;
    text-align: center;
}

.activation-function h3 {
    font-family: var(--font-display);
    margin-bottom: 1rem;
    color: var(--accent-cyan);
}

.activation-function canvas {
    width: 100%;
    margin-bottom: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

.function-formula {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

/* CHATBOT */
.chatbot-section {
    padding: 8rem 0 2rem;
}

.chat-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    height: calc(100vh - 12rem);
}

.chat-sidebar {
    padding: 2rem;
    border-radius: 24px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.chat-header {
    text-align: center;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.chat-header h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

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

.quick-topics h4 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.topic-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-secondary);
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-body);
}

.topic-btn:hover {
    background: rgba(0, 240, 255, 0.1);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
    transform: translateX(5px);
}

.chat-main {
    display: flex;
    flex-direction: column;
    border-radius: 24px;
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.message {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 0.3s ease-out;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
}

.message-content {
    flex: 1;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.message-content strong {
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
    display: block;
}

.message-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0.75rem;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.chat-input-container {
    padding: 1.5rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.chat-input-wrapper {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.chat-input-wrapper textarea {
    flex: 1;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    resize: none;
    outline: none;
    transition: all 0.3s ease;
}

.chat-input-wrapper textarea:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}

.send-btn {
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border: none;
    border-radius: 12px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
}

.send-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 240, 255, 0.5);
}

/* CTA SECTION */
.cta-section {
    position: relative;
    padding: 6rem 0;
    overflow: hidden;
}

.cta-glow-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.2), transparent 70%);
    filter: blur(80px);
    animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.1); }
}

.cta-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    margin-bottom: 1rem;
}

.cta-text {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

/* FOOTER */
.footer {
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(30px);
    border-top: 1px solid rgba(0, 240, 255, 0.15);
    padding: 3rem 0 1.5rem;
    position: relative;
    z-index: 10;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 1rem;
    line-height: 1.7;
}

.footer-links {
    display: contents;
}

.footer-column h4 {
    font-family: var(--font-display);
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--accent-cyan);
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* NEW FEATURES SECTION - BONUS! */
.new-features {
    padding: 3rem;
    border-radius: 24px;
    margin: 4rem 0;
    position: relative;
    overflow: hidden;
}

.new-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.new-feature-card {
    padding: 2rem;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid rgba(0, 240, 255, 0.3);
}

.new-feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(0, 240, 255, 0.4);
    border-color: var(--accent-cyan);
}

.new-badge {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: linear-gradient(135deg, #ff006e, #7b2cbf);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    animation: pulse 2s ease-in-out infinite;
}

.new-feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.new-feature-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.new-feature-card .btn {
    margin-top: auto;
}

/* 3D VIZ STYLES - BONUS! */
.viz3d-section {
    padding: 4rem 0;
}

.viz3d-main {
    padding: 3rem;
    border-radius: 24px;
    position: relative;
    overflow: hidden;
}

.viz3d-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

#canvas3d {
    width: 100%;
    height: 600px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 16px;
    border: 2px solid var(--accent-cyan);
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
}

.viz3d-controls {
    padding: 2rem;
    border-radius: 16px;
}

.viz3d-controls h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.control-info {
    margin-bottom: 2rem;
    padding: 1rem;
    background: rgba(0, 240, 255, 0.05);
    border-radius: 8px;
}

.control-info p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.viz3d-settings {
    margin-bottom: 2rem;
}

.viz3d-settings h4 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.viz3d-settings .setting-item {
    margin-bottom: 1rem;
}

.viz3d-settings input[type="range"] {
    width: 100%;
    margin: 0.5rem 0;
}

.viz3d-settings input[type="checkbox"] {
    margin-right: 0.5rem;
}

.viz3d-info {
    padding: 2rem;
    border-radius: 16px;
}

.viz3d-info h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.stats-3d {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-3d-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}

.stat-3d-label {
    color: var(--text-secondary);
}

.stat-3d-value {
    color: var(--accent-cyan);
    font-weight: 700;
    font-family: var(--font-display);
}

.layer-legend {
    padding: 1.5rem;
    background: rgba(0, 240, 255, 0.05);
    border-radius: 12px;
}

.layer-legend h4 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

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

.legend-color {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    box-shadow: 0 0 10px currentColor;
}

.features-3d {
    padding: 3rem;
    border-radius: 24px;
    margin-top: 2rem;
}

.features-3d h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: 2rem;
}

.features-3d-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-3d-card {
    padding: 1.5rem;
    text-align: center;
}

.feature-3d-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.5));
}

.feature-3d-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-3d-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* RESPONSIVE */
@media (max-width: 1200px) {
    .playground-grid, .architecture-builder {
        grid-template-columns: 1fr;
    }

    .viz3d-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .chat-container {
        grid-template-columns: 1fr;
        height: auto;
    }

    .chat-sidebar {
        display: none;
    }

    .courses-grid, .features-grid {
        grid-template-columns: 1fr;
    }
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
}