:root {
    --blue: #0066ff;
    --dark: #1d1d1f;
    --gray: #86868b;
    --bg: #ffffff;
    --card-bg: #f5f5f7;
}

body {
    background-color: var(--bg);
    color: var(--dark);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    -webkit-font-smoothing: antialiased;
}

nav {
    padding: 25px 0;
    border-bottom: 1px solid #f2f2f2;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo-text {
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -1px;
}

.dot { color: var(--blue); }

.system-status {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--gray);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

main {
    max-width: 1100px;
    margin: 80px auto;
    padding: 0 20px;
}

header {
    margin-bottom: 80px;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -2px;
}

.blue-gradient { color: var(--blue); }

header p {
    color: var(--gray);
    font-size: 1.25rem;
    margin-top: 15px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 30px;
}

.card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 24px;
    transition: all 0.2s ease-in-out;
}

.card:hover {
    transform: scale(1.01);
    background: #f0f0f3;
}

.card-num {
    color: var(--blue);
    font-weight: 800;
    font-size: 0.85rem;
    margin-bottom: 25px;
}

h2 {
    font-size: 1.75rem;
    margin: 0 0 15px 0;
    letter-spacing: -0.5px;
}

p {
    color: #424245;
    line-height: 1.6;
    font-size: 1.05rem;
    margin-bottom: 30px;
}

.tags { display: flex; gap: 8px; flex-wrap: wrap; }

.tags span {
    background: white;
    padding: 6px 14px;
    border-radius: 10px;
    font-size: 0.65rem;
    font-weight: 800;
    color: var(--blue);
    text-transform: uppercase;
    border: 1px solid #eee;
}

footer {
    margin-top: 100px;
    padding-bottom: 60px;
    text-align: center;
}

.clean-footer {
    font-family: "SF Mono", "Fira Code", monospace;
    font-size: 0.8rem;
    color: var(--gray);
    padding: 10px;
}

@media (max-width: 600px) {
    h1 { font-size: 2.5rem; }
    .grid { grid-template-columns: 1fr; }
}