:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-main: #2d3436;
    --text-muted: #636e72;
    --white: #ffffff;
}

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

body {
    font-family: 'Outfit', sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.unsplash.com/photo-1551698618-1fed5d97530d?auto=format&fit=crop&q=80&w=2000') no-repeat center center/cover;
    opacity: 0.1;
    z-index: -1;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    padding: 60px 0 40px;
    text-align: center;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    letter-spacing: -1px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--accent);
    font-weight: 400;
}

main {
    flex: 1;
}

.card {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
    margin-bottom: 60px;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 40px;
    border-bottom: 2px solid #eee;
    padding-bottom: 15px;
}

.tab-btn {
    padding: 10px 25px;
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 12px;
}

.tab-btn:hover {
    color: var(--accent);
    background: rgba(52, 152, 219, 0.1);
}

.tab-btn.active {
    color: var(--white);
    background: var(--accent);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--primary);
}

h3 {
    font-size: 1.25rem;
    margin: 30px 0 15px;
    color: var(--primary);
}

p {
    margin-bottom: 15px;
    color: var(--text-main);
}

.last-updated {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-style: italic;
}

ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

li {
    margin-bottom: 10px;
}

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

a:hover {
    text-decoration: underline;
}

footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
    header h1 { font-size: 2rem; }
    .card { padding: 25px; }
    .tabs { flex-direction: column; }
    .tab-btn { width: 100%; text-align: center; }
}