/* base.css — Reset, typography, and CSS custom properties */

:root {
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-muted: #6c757d;
    --color-border: #dee2e6;
    --color-accent: #4361ee;
    --color-accent-hover: #3a56d4;
    --color-accent-soft: rgba(67, 97, 238, 0.08);
    --color-accent-faint: rgba(67, 97, 238, 0.04);
    --color-danger: #e5383b;
    --color-danger-hover: #c92e31;
    --color-danger-soft: rgba(229, 56, 59, 0.08);
    --color-success: #2a9d8f;
    --color-success-soft: rgba(42, 157, 143, 0.12);
    --color-focus-ring: rgba(67, 97, 238, 0.15);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.10);

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

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

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

a:hover {
    text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}