:root {
    /* Modern Gen-Z Palette */
    --bg-main: #fafafa;
    --bg-card: #ffffff;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-gradient-subtle: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);

    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-muted: #8888a4;

    /* Vibrant Accents */
    --accent-primary: #6366f1;    /* Indigo */
    --accent-secondary: #8b5cf6;  /* Purple */
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --accent-pink: #ec4899;

    --border: rgba(0, 0, 0, 0.06);
    --border-strong: rgba(0, 0, 0, 0.1);

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px rgba(99, 102, 241, 0.1);

    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --radius: 16px;
    --radius-lg: 24px;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    margin: 0;
    background: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    display: flex;
    flex-direction: column;
}

/* Subtle animated background gradient */
.page-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
}

/* Navbar - Glassmorphism */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 5%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    flex-shrink: 0;
}

.logo img {
    height: 48px;
    transition: transform 0.2s ease;
}

.logo img:hover {
    transform: scale(1.05);
}

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-top: 0;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    padding: 0.6rem 1.25rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-heading);
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    padding: 0.6rem 1.25rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-heading);
    transition: all 0.3s ease;
    border: 1px solid var(--border-strong);
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-secondary:hover {
    background: white;
    border-color: var(--accent-primary);
}

/* Compact Hero Section */
.hero-compact {
    padding: 1.5rem 5% 1rem;
    flex-shrink: 0;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-compact h1 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    line-height: 1.2;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.hero-compact h1 .gradient-text {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 50%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-compact p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.hero-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    margin-bottom: 0.75rem;
}

.hero-badge .dot {
    width: 6px;
    height: 6px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Tabs Section */
.tabs-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 0 5%;
    min-height: 0;
    overflow: hidden;
}

.tabs-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
    min-height: 0;
    overflow: hidden;
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-card);
    padding: 0.4rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.tab-btn {
    flex: 1;
    padding: 0.6rem 1rem;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-gradient-subtle);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Tab Content */
.tab-content-wrapper {
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.tab-content {
    display: none;
    height: 100%;
    overflow-y: auto;
    padding-bottom: 1rem;
}

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

/* Resources Grid */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.resource-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--glass-shadow);
    transform: translateY(-2px);
}

.resource-card.primary {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

.resource-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.resource-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.resource-count {
    font-size: 0.8rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.resource-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem 0;
    flex-grow: 1;
}

.resource-list li {
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding: 0.25rem 0;
    padding-left: 1.1rem;
    position: relative;
}

.resource-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: bold;
    font-size: 0.75rem;
}

.resource-link {
    display: inline-block;
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.resource-link:hover {
    color: var(--accent-secondary);
}

.resource-tip {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(6, 182, 212, 0.08) 100%);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.tip-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.resource-tip p {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.5;
}

/* Strategy Grid */
.strategy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.strategy-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    position: relative;
    transition: all 0.3s ease;
}

.strategy-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--glass-shadow);
}

.strategy-number {
    position: absolute;
    top: -10px;
    left: 1rem;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
}

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

.strategy-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.strategy-time {
    display: inline-block;
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-radius: 4px;
    font-weight: 600;
}

/* FAQ Grid */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.faq-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    transition: all 0.3s ease;
}

.faq-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--glass-shadow);
}

.faq-card h3 {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.faq-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Demo Container */
.demo-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 1.5rem;
    height: 100%;
}

.vre-window {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 15px 40px -10px rgba(0, 0, 0, 0.12);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.vre-header {
    padding: 0.6rem 1rem;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.window-controls {
    display: flex;
    gap: 6px;
}

.window-controls span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.control-close { background: #ef4444; }
.control-min { background: #eab308; }
.control-max { background: #22c55e; }

.vre-title {
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.vre-canvas-container {
    flex: 1;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 250px;
}

.vre-footer {
    padding: 0.75rem;
    background: #f8fafc;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: center;
    flex-shrink: 0;
}

.demo-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.demo-features h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.demo-feature {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.demo-feature:hover {
    border-color: var(--accent-primary);
}

.feature-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.demo-feature strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.demo-feature p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.4;
}

/* Footer */
footer {
    text-align: center;
    padding: 1rem;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

footer p {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin: 0;
}

/* Responsive */
@media (max-width: 900px) {
    .resources-grid,
    .strategy-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 600px) {
    .resources-grid,
    .strategy-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }

    .tab-nav {
        flex-wrap: wrap;
    }

    .tab-btn {
        flex: 1 1 45%;
    }

    html, body {
        overflow: auto;
        height: auto;
    }

    .tabs-section {
        overflow: visible;
    }

    .tab-content-wrapper {
        overflow: visible;
    }

    .tab-content {
        overflow: visible;
        height: auto;
    }
}