:root {
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --primary-active: #1D4ED8;
    --secondary: #8B5CF6;
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --border-primary: #E2E8F0;
    --border-secondary: #CBD5E1;
    --spacing-tight: 8px;
    --spacing-standard: 16px;
    --spacing-loose: 24px;
    --spacing-extra: 32px;
}

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

body {
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-loose);
}

h1 {
    font-size: 32px;
    font-weight: 600;
    line-height: 1.2;
}

h2 {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.3;
}

h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
}

h4 {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.5;
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease-in-out;
}

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

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

button {
    font-family: inherit;
    font-size: inherit;
    border: none;
    cursor: pointer;
    outline: none;
}

.btn-primary {
    background: var(--primary);
    color: #FFFFFF;
    border-radius: 8px;
    padding: 8px 16px;
    transition: all 0.2s ease-in-out;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-primary:active {
    background: var(--primary-active);
    transform: translateY(1px);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

input {
    font-family: inherit;
    font-size: inherit;
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 8px 12px;
    outline: none;
    transition: all 0.2s ease-in-out;
}

input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

ul {
    list-style: none;
}