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

:root {
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --fg: #2c3e50;
    --fg-muted: #6c757d;
    --fg-light: #adb5bd;
    --border: #e9ecef;
    --border-focus: #ced4da;
    --btn-bg: #e9ecef;
    --btn-bg-hover: #dee2e6;
    --btn-primary-bg: #495057;
    --btn-primary-bg-hover: #343a40;
    --btn-primary-fg: #ffffff;
    --error-bg: #fdf2f2;
    --error-fg: #b04a4a;
    --error-border: #f0d4d4;
    --success-bg: #f1f8f2;
    --success-fg: #2e7d32;
    --success-border: #c8e6c9;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.02), 0 8px 24px rgba(0,0,0,0.03);
    --font: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

html, body {
    min-height: 100%;
}

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.5;
    color: var(--fg);
    background: var(--bg);
    padding: 24px 16px;
    padding: max(24px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
    -webkit-font-smoothing: antialiased;
}

code {
    font-family: var(--mono);
    font-size: 0.9em;
    background: var(--bg);
    padding: 1px 5px;
    border-radius: 4px;
    color: var(--fg-muted);
}

button {
    font-family: inherit;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

a {
    color: inherit;
    text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1c1f22;
        --card-bg: #26292d;
        --fg: #e6e8ea;
        --fg-muted: #9aa0a6;
        --fg-light: #6b7075;
        --border: #34383d;
        --border-focus: #4a4f55;
        --btn-bg: #34383d;
        --btn-bg-hover: #3d4248;
        --btn-primary-bg: #e6e8ea;
        --btn-primary-bg-hover: #f0f2f4;
        --btn-primary-fg: #1c1f22;
        --error-bg: #2e2020;
        --error-fg: #e0a8a8;
        --error-border: #4a3030;
        --success-bg: #1b2a1f;
        --success-fg: #86efac;
        --success-border: #2e4a33;
        --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.25);
    }
}