:root {
    /* GSAD Color Scheme: White, Black, Blue, and Blue accent */
    --color-bg: #ffffff;
    --color-text: #000000;
    /* Black text */
    --color-muted: #666666;
    /* Dark gray for secondary text */
    --color-surface: #f5f5f5;
    /* Light gray surface */

    --color-primary: #3976ff;
    /* Deep blue primary */
    --color-primary-600: #00408e;
    /* Darker blue shade */
    --color-primary-contrast: #ffffff;

    --color-secondary: #317dc9;
    /* Bright blue accent */
    --color-accent: #0052a3;
    /* Blue accent */

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-8: 48px;
    --space-10: 64px;

    --font-base: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    --font-heading: var(--font-base);
    --font-size-base: 16px;
    --line-height: 1.6;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.10);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-text);
    background: var(--color-bg);
    font-family: var(--font-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
}

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

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.1rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-primary-contrast);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--color-primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.section {
    padding: var(--space-10) 0;
}

.section-muted {
    background: var(--color-surface);
}

.grid {
    display: grid;
    gap: var(--space-5);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 900px) {

    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }
}