:root {
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --bg: #ffffff;
    --text: #1a1a1a;
    --text-muted: #666666;
    --border: #eeeeee;
    --card-bg: #fafafa;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Nav */
header {
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 32px;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.2s;
}

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

.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, background 0.2s;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

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

.hero {
    text-align: center;
    padding: 100px 0;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

/* Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 30px;
    border-radius: 12px;
    transition: border-color 0.2s;
}

.card:hover {
    border-color: var(--primary);
}

.card h3 {
    margin-bottom: 15px;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 60px 0;
    margin-top: 80px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Changelog Styles */
.changelog-item {
    margin-bottom: 40px;
}

.changelog-version {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.changelog-date {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.changelog-content {
    margin-top: 15px;
}

.changelog-content h3 {
    font-size: 1rem;
    margin: 15px 0 5px;
}

.changelog-content ul {
    list-style: disc;
    margin-left: 20px;
}

/* Utilities */
.text-center { text-align: center; }
.mb-20 { margin-bottom: 20px; }
.mt-40 { margin-top: 40px; }

@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; }
}