:root {
    --clr-primary: #0a4d8f;
    --clr-secondary: #1e88e5;
    --clr-accent: #ff6b35;
    --clr-success: #10b981;
    --clr-bg: #ffffff;
    --clr-surface: #f8fafc;
    --clr-text: #1e293b;
    --clr-text-muted: #64748b;
    --clr-border: #e2e8f0;
    --spacing-unit: clamp(1rem, 2vw, 1.5rem);
    --max-width: 75rem;
    --border-radius: 0.75rem;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --clr-primary: #3b82f6;
        --clr-secondary: #60a5fa;
        --clr-accent: #fb923c;
        --clr-bg: #0f172a;
        --clr-surface: #1e293b;
        --clr-text: #f1f5f9;
        --clr-text-muted: #94a3b8;
        --clr-border: #334155;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
        --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
    }
}

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

img{max-width: 100%;height: auto;}

html {
    font-size: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--clr-bg);
    color: var(--clr-text);
    line-height: 1.7;
    font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
}

main {
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-secondary) 100%);
    color: white;
    padding: clamp(2.5rem, 5vw, 4rem) var(--spacing-unit);
    text-align: center;
    position: relative;
    overflow: hidden;
}
header p {
    color: #fff;
}
header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0l30 30-30 30L0 30z' fill='%23ffffff' fill-opacity='0.05'/%3E%3C/svg%3E");
    opacity: 0.3;
}

header > * {
    position: relative;
    z-index: 1;
}

h1 {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

header p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    max-width: 50rem;
    margin: 0 auto;
    opacity: 0.95;
    font-weight: 300;
}

nav {
    background: var(--clr-surface);
    padding: 1rem var(--spacing-unit);
    border-bottom: 1px solid var(--clr-border);
    box-shadow: var(--shadow-sm);
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    max-width: var(--max-width);
    margin: 0 auto;
}

nav a {
    color: var(--clr-text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition);
    display: block;
}

nav a:hover, nav a:focus {
    background: var(--clr-primary);
    color: white;
    transform: translateY(-2px);
    outline: 2px solid var(--clr-primary);
    outline-offset: 2px;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: clamp(2rem, 4vw, 4rem) var(--spacing-unit);
}

section {
    margin-bottom: clamp(3rem, 6vw, 5rem);
}

section:last-of-type {
    margin-bottom: 0;
}

h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.25rem);
    color: var(--clr-primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
    position: relative;
    padding-bottom: 0.75rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 4rem;
    height: 0.25rem;
    background: linear-gradient(90deg, var(--clr-accent), transparent);
    border-radius: 2px;
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    color: var(--clr-secondary);
    margin: 2rem 0 1rem;
    font-weight: 600;
}

p {
    margin-bottom: 1.25rem;
    color: var(--clr-text);
}

p:last-child {
    margin-bottom: 0;
}

strong {
    color: var(--clr-primary);
    font-weight: 600;
}

ul, ol {
    margin: 1.5rem 0;
    padding-left: 1.75rem;
}

li {
    margin-bottom: 0.75rem;
    color: var(--clr-text);
}

li::marker {
    color: var(--clr-accent);
}

.highlight-box {
    background: var(--clr-surface);
    border-left: 4px solid var(--clr-accent);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 2rem 0;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
}

.highlight-box:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background: var(--clr-surface);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--clr-border);
    transition: all var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--clr-primary);
}

.stat-card strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--clr-secondary);
}

aside {
    background: linear-gradient(135deg, var(--clr-surface) 0%, var(--clr-bg) 100%);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 2px solid var(--clr-border);
    margin: 3rem 0;
    box-shadow: var(--shadow-md);
}

aside h3 {
    color: var(--clr-primary);
    margin-top: 0;
}

details {
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    margin: 1.5rem 0;
    cursor: pointer;
    transition: all var(--transition);
}

details:hover {
    border-color: var(--clr-primary);
    box-shadow: var(--shadow-sm);
}

details[open] {
    background: var(--clr-bg);
    box-shadow: var(--shadow-md);
}

summary {
    font-weight: 600;
    color: var(--clr-primary);
    font-size: 1.1rem;
    list-style: none;
    position: relative;
    padding-left: 1.75rem;
}

summary::before {
    content: '▶';
    position: absolute;
    left: 0;
    transition: transform var(--transition);
    color: var(--clr-accent);
}

details[open] summary::before {
    transform: rotate(90deg);
}

summary::-webkit-details-marker {
    display: none;
}

summary:hover {
    color: var(--clr-secondary);
}

details p {
    margin-top: 1rem;
    padding-left: 1.75rem;
}

.faq-section {
    background: var(--clr-surface);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    margin-top: 3rem;
    box-shadow: var(--shadow-md);
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 2rem;
}

footer {
    background: var(--clr-surface);
    border-top: 3px solid var(--clr-primary);
    padding: 2.5rem var(--spacing-unit);
    text-align: center;
    margin-top: 4rem;
}

footer p {
    color: var(--clr-text-muted);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

footer time, p time{
    color: var(--clr-primary);
    font-weight: 600;
}

mark {
    background: linear-gradient(120deg, var(--clr-accent) 0%, transparent 100%);
    background-position: 0 85%;
    background-repeat: no-repeat;
    background-size: 100% 30%;
    padding: 0;
    color: inherit;
}

:focus-visible {
    outline: 3px solid var(--clr-accent);
    outline-offset: 3px;
    border-radius: 2px;
}

::selection {
    background: var(--clr-accent);
    color: white;
}

@media (max-width: 768px) {
    nav ul {
        font-size: 0.85rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    aside {
        padding: 1.5rem;
    }
}

@media print {
    nav, aside {
        display: none;
    }
    
    * {
        box-shadow: none !important;
    }
}