/* ===== CSS Variables ===== */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #0ea5e9;
    --accent-color: #06b6d4;
    --text-dark: #1e293b;
    --text-gray: #64748b;
    --text-light: #94a3b8;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --success-color: #22c55e;
    --danger-color: #ef4444;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary-color: #38bdf8;
    --accent-color: #22d3ee;
    --text-dark: #f1f5f9;
    --text-gray: #94a3b8;
    --text-light: #64748b;
    --bg-light: #0f172a;
    --bg-white: #1e293b;
    --border-color: #334155;
    --card-bg: #1e293b;
    --success-color: #22c55e;
    --danger-color: #ef4444;
}

/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-dark);
    background: var(--bg-light);
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}