/* Clean, Readable Design for Prompt Stack */

:root {
    --bg-dark: #0f172a;
    --bg-light: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --accent: #3b82f6;
    --accent-light: #60a5fa;
    --border: #334155;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 18px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.logo-bracket {
    color: var(--accent-light);
    font-weight: 300;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--accent-light);
}

/* Hero Section */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: 140px 0 80px;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.gradient-text {
    color: var(--accent-light);
    display: block;
}

.hero-subtitle {
    display: block;
    font-size: 2.25rem;
    font-weight: 300;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin: 2rem 0 2.5rem;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* Buttons */
.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    display: inline-block;
}

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

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-light);
    border: 2px solid var(--accent);
}

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

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-number {
    font-size: 1.25rem;
    color: var(--accent-light);
    font-weight: 400;
}

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

.card {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

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

.card-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent-light);
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech {
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    background: rgba(59, 130, 246, 0.1);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.card-links {
    display: flex;
    gap: 1.5rem;
}

.link {
    color: var(--accent-light);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s ease;
}

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

/* Guide List */
.guide-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.guide-item {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 2rem;
    text-decoration: none;
    border: 1px solid var(--border);
    transition: all 0.2s ease;
    display: block;
}

.guide-item:hover {
    transform: translateX(8px);
    border-color: var(--accent);
}

.guide-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.guide-category {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent-light);
}

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

.guide-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.guide-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.guide-link {
    color: var(--accent-light);
    font-weight: 600;
}

/* About Section */
.about-content {
    max-width: 800px;
}

.insight-box {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 2.5rem;
    margin-bottom: 3rem;
    border: 1px solid var(--accent);
}

.insight-text {
    font-size: 1.375rem;
    line-height: 1.7;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.insight-text:last-child {
    margin-bottom: 0;
}

.philosophy h3 {
    font-size: 1.75rem;
    margin: 2.5rem 0 1rem;
    color: var(--accent-light);
}

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

.highlight {
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-top: 2rem;
}

/* Footer */
.footer {
    background: var(--bg-light);
    padding: 3rem 0 2rem;
    border-top: 1px solid var(--border);
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--accent-light);
}

.footer-section p,
.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.footer-section a:hover {
    color: var(--accent-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .nav-links {
        gap: 1rem;
    }

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

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        text-align: center;
    }
}

/* Remove background stars for better readability */
.stars, .stars2, .stars3 {
    display: none;
}