:root {
    --bg-color: #0a0f1e;
    --text-color: #e2e8f0;
    --primary-color: #3b82f6;
    --primary-dark: #1e3a8a;
    --accent-color: #60a5fa;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.glass-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 15, 30, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    padding: 15px 0;
}

.glass-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
    font-size: 1.5rem;
}

.logo-j {
    background: var(--primary-color);
    color: white;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 20px;
    font-size: 0.9rem;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--primary-color);
}

/* Sections */
section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    background: linear-gradient(to right, #fff, var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: white;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.8rem;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-section .container {
    display: flex;
    align-items: center;
    gap: 50px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight {
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #94a3b8;
    margin-bottom: 40px;
}

.hero-btns {
    display: flex;
    gap: 20px;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-visual svg {
    width: 100%;
    max-width: 400px;
    filter: drop-shadow(0 0 20px rgba(59, 130, 246, 0.3));
}

/* Glass Card & Panels */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 30px;
    box-shadow: var(--card-shadow);
}

.glass-panel {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 20px;
}

/* Timeline */
.timeline-container {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.timeline-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.timeline-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s;
    background: transparent;
    border: 1px solid transparent;
}

.timeline-item:hover {
    background: var(--glass-bg);
}

.timeline-item.active {
    background: var(--glass-bg);
    border-color: var(--primary-color);
}

.timeline-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-dark);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.timeline-item.active .timeline-icon {
    background: var(--primary-color);
    color: white;
}

.timeline-content {
    flex: 1.5;
}

/* Demos */
.demo-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 80px;
}

.demo-info h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.keyboard-hint {
    margin: 20px 0;
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 0.8rem;
    color: #94a3b8;
}

kbd {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 4px;
    padding: 2px 6px;
    font-family: monospace;
}

#game-stats {
    margin: 20px 0;
    font-size: 1.2rem;
    font-weight: bold;
}

#canvas-wrapper {
    width: 100%;
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

canvas {
    max-width: 100%;
    max-height: 100%;
}

/* News Form */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    margin-bottom: 5px;
    color: #94a3b8;
}

.form-group input, .form-group textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 10px;
    color: white;
    outline: none;
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.news-list {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 400px;
    overflow-y: auto;
}

.news-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 15px;
    transition: transform 0.3s;
}

.news-card:hover {
    transform: translateX(5px);
    border-color: var(--primary-color);
}

.news-card-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

.news-tag {
    font-size: 0.7rem;
    background: var(--primary-dark);
    color: var(--accent-color);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: bold;
}

.news-priority {
    font-size: 0.7rem;
    color: #94a3b8;
}

.news-card h5 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.news-card p {
    font-size: 0.85rem;
    color: #94a3b8;
}

/* Use Cases */
.usecase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.usecase-card {
    text-align: center;
    transition: transform 0.3s;
}

.usecase-card:hover {
    transform: translateY(-10px);
}

.usecase-card i {
    width: 60px;
    height: 60px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.usecase-card h4 {
    font-size: 1.25rem;
    margin-bottom: 15px;
}

.usecase-card p {
    font-size: 0.9rem;
    color: #94a3b8;
}

/* Footer */
footer {
    padding: 50px 0;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    color: #64748b;
    font-size: 0.9rem;
}

footer a {
    color: inherit;
    text-decoration: none;
}

/* Animations */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.logo-j:hover {
    animation: pulse 1s infinite;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section .container {
        flex-direction: column;
        text-align: center;
        padding-top: 50px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-btns {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .timeline-container {
        flex-direction: column;
    }

    .demo-grid {
        grid-template-columns: 1fr;
    }

    .demo-visual {
        order: -1;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}