:root {
    --color-primary-50: #ecfdf5;
    --color-primary-100: #d1fae5;
    --color-primary-200: #a7f3d0;
    --color-primary-300: #6ee7b7;
    --color-primary-400: #34d399;
    --color-primary-500: #10b981;
    --color-primary-600: #059669;
    --color-primary-700: #047857;
    --color-primary-800: #065f46;
    --color-primary-900: #064e3b;

    --color-secondary-50: #fffbeb;
    --color-secondary-100: #fff3c6;
    --color-secondary-200: #ffe588;
    --color-secondary-300: #ffd24a;
    --color-secondary-400: #ffbe20;
    --color-secondary-500: #f99b07;
    --color-secondary-600: #dd7302;
    --color-secondary-700: #b75006;

    --color-success-500: #22c55e;
    --color-success-600: #16a34a;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;
    --color-error-500: #ef4444;
    --color-error-600: #dc2626;

    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono: ui-monospace, "Cascadia Code", "Fira Code", monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;

    --navbar-height: 3.5rem;
    --bottom-tabs-height: 3.5rem;
}

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

html {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-800);
    background: var(--color-gray-50);
    -webkit-font-smoothing: antialiased;
}

body {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

a {
    color: var(--color-primary-600);
    text-decoration: none;
}

a:hover {
    color: var(--color-primary-700);
    text-decoration: underline;
}

h1, h2, h3, h4 {
    line-height: 1.3;
    color: var(--color-gray-900);
}

h1 { font-size: var(--text-3xl); font-weight: 700; }
h2 { font-size: var(--text-2xl); font-weight: 600; }
h3 { font-size: var(--text-xl); font-weight: 600; }

.lead {
    font-size: var(--text-lg);
    color: var(--color-gray-600);
}

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

ul, ol {
    padding-left: var(--space-6);
}

:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}
.input:focus-visible {
    outline: none;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary-500);
    color: white;
    border-radius: var(--radius-md);
    z-index: 9999;
    font-weight: 500;
    text-decoration: none;
}
.skip-link:focus {
    top: var(--space-2);
}