:root {
    --color-bg: #f5f7fb;
    --color-surface: #ffffff;
    --color-surface-muted: #f8fafc;
    --color-text: #172033;
    --color-muted: #64748b;
    --color-border: #dbe4ef;
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-success: #15803d;
    --color-success-bg: #eaf8ef;
    --color-danger: #b42318;
    --color-danger-bg: #fdecec;
    --color-warning: #b45309;
    --color-warning-bg: #fff7ed;
    --color-info: #1d4ed8;
    --color-info-bg: #edf4ff;
    --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 28px rgba(15, 23, 42, 0.10);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
    letter-spacing: 0;
}

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

a {
    color: var(--color-primary);
}

a:hover {
    color: var(--color-primary-dark);
}

h1,
h2,
h3,
h4,
p {
    overflow-wrap: anywhere;
}

.text-muted {
    color: var(--color-muted);
}

.center {
    text-align: center;
}

.hidden {
    display: none !important;
}

@media (max-width: 640px) {
    body {
        font-size: 15px;
    }
}