:root {
    --primary-blue: #00aaff;
    --dark-bg: #0a0e14;
    --card-bg: #161b22;
    --text-main: #c9d1d9;
    --text-dim: #8b949e;
    --accent-glow: rgba(0, 170, 255, 0.3);
    --code-bg: #0d1117;
}

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

body {
    background-color: var(--dark-bg);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    padding-bottom: 100px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 60px 0;
    border-bottom: 1px solid #30363d;
}

.hero-logo {
    width: 120px;
    height: 120px;
    margin-bottom: 20px;
    filter: drop-shadow(0 0 15px var(--primary-blue));
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-dim);
}

section {
    margin-top: 60px;
}

h2 {
    font-size: 1.8rem;
    color: var(--primary-blue);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
}

h2::before {
    content: "•";
    margin-right: 15px;
    font-size: 1.4rem;
}

p {
    margin-bottom: 20px;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid #30363d;
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

h3 {
    color: #f0f6fc;
    margin-bottom: 15px;
}

code {
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    color: #79c0ff;
}

pre {
    background-color: var(--code-bg);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    border: 1px solid #30363d;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: #d1d5da;
}

.diagram {
    background: #1c2128;
    border-radius: 12px;
    padding: 20px;
    margin: 30px 0;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    background-color: rgba(56, 139, 253, 0.15);
    color: var(--primary-blue);
    border: 1px solid rgba(56, 139, 253, 0.4);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-right: 10px;
}

.pqc-badge {
    background-color: rgba(163, 113, 247, 0.15);
    color: #a371f7;
    border: 1px solid rgba(163, 113, 247, 0.4);
}

ul {
    list-style-type: none;
    margin-bottom: 20px;
}

li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
}

li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

footer {
    text-align: center;
    padding: 60px 0;
    color: var(--text-dim);
    font-size: 0.9rem;
    border-top: 1px solid #30363d;
}

.math-block {
    text-align: center;
    font-size: 1.1rem;
    padding: 15px;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    margin: 10px 0;
}