/* Premium landing page styling for HTML Test Patterns */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&display=swap');

:root {
    --bg-color: #0b0f19;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-hover-border: rgba(99, 102, 241, 0.4);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --primary-accent: #6366f1;
    --secondary-accent: #a855f7;
    --glow-color: rgba(99, 102, 241, 0.15);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(168, 85, 247, 0.08) 0%, transparent 45%);
}

header {
    max-width: 1200px;
    width: 100%;
    margin: 4rem auto 2rem;
    padding: 0 2rem;
    text-align: center;
}

header h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #a5b4fc 0%, #d8b4fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    letter-spacing: -0.05em;
}

header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
    max-width: 600px;
    margin: 0 auto;
}

main {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 2rem 4rem;
    flex-grow: 1;
}

.patterns-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}

.card-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-accent), var(--secondary-accent));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--card-hover-border);
    box-shadow: 0 20px 40px -15px var(--glow-color);
}

.card:hover::before {
    opacity: 1;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    letter-spacing: -0.02em;
}

.card-title svg {
    width: 18px;
    height: 18px;
    stroke: var(--text-secondary);
    transition: stroke 0.3s ease, transform 0.3s ease;
}

.card-link:hover .card-title svg {
    stroke: var(--primary-accent);
    transform: translate(2px, -2px);
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 300;
    line-height: 1.5;
    margin-bottom: 0.5rem;
}

.card-meta {
    margin-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.card-author a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.card-author a:hover {
    color: var(--primary-accent);
}


.card-tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--primary-accent);
}

footer {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 300;
}

footer a {
    color: var(--primary-accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}