:root {
    --color-primary: #1e88e5;
    --color-primary-dark: #1565c0;
    --color-bg: #f5f9ff;
    --color-text: #1b1f23;
    --color-muted: #607d8b;
    --shadow-soft: 0 4px 12px rgba(0,0,0,0.08);
    --radius: 10px;
    --transition-fast: 0.2s ease-in-out;
    --max-width: 1100px;
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

/* Layout */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header & Logo */

.site-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #ffffff;
    box-shadow: var(--shadow-soft);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 0;
}

.logo-title {
    font-weight: 600;
    letter-spacing: 0.03em;
}

.logo-image {
    height: 40px;
    display: block;
}

/* Navigation */

.main-nav {
    position: relative;
}

.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    width: 32px;
    height: 24px;
    position: relative;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
    display: block;
    position: absolute;
    width: 100%;
    height: 3px;
    background: #ffffff;
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle-label span {
    top: 50%;
    transform: translateY(-50%);
}

.nav-toggle-label span::before {
    content: "";
    top: -9px;
}

.nav-toggle-label span::after {
    content: "";
    top: 9px;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.nav-list a {
    color: #e3f2fd;
    text-decoration: none;
    font-size: 0.95rem;
    position: relative;
    padding-bottom: 0.15rem;
}

.nav-list a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: #ffffff;
    transition: width var(--transition-fast);
}

.nav-list a:hover::after,
.nav-list a:focus::after {
    width: 100%;
}

/* Mobile nav */

@media (max-width: 768px) {
    .nav-toggle-label {
        display: block;
    }

    .nav-list {
        position: absolute;
        top: 110%;
        right: 0;
        background: rgba(21, 101, 192, 0.98);
        flex-direction: column;
        min-width: 220px;
        padding: 0.75rem 1rem;
        border-radius: var(--radius);
        box-shadow: var(--shadow-soft);
        opacity: 0;
        transform: translateY(-10px);
        pointer-events: none;
        transition: opacity var(--transition-fast), transform var(--transition-fast);
    }

    .nav-list li {
        margin: 0.2rem 0;
    }

    .nav-toggle:checked + .nav-toggle-label + .nav-list {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }

    .nav-toggle:checked + .nav-toggle-label span {
        transform: translateY(-50%) rotate(45deg);
    }

    .nav-toggle:checked + .nav-toggle-label span::before {
        transform: rotate(-90deg) translateX(-9px);
    }

    .nav-toggle:checked + .nav-toggle-label span::after {
        opacity: 0;
    }
}

/* Main */

.site-main {
    padding: 2rem 0 3rem;
}

.page {
    background: #ffffff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-soft);
    padding: 2rem;
}

.page-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--color-primary-dark);
}

.page-content p + p {
    margin-top: 0.9rem;
}

.page-content a {
    color: var(--color-primary);
}

/* Footer */

.site-footer {
    border-top: 1px solid rgba(0,0,0,0.06);
    background: #ffffff;
}

.footer-inner {
    padding: 1rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-muted);
}