:root {
    --primary: #1e3a5f;
    --primary-light: #2d5a87;
    --primary-dark: #152a45;
    --primary-50: #f0f5fa;
    --primary-100: #dce8f3;
    --primary-200: #b8d1e8;

    --success: #16a34a;
    --warning: #ca8a04;
    --danger: #dc2626;
    --info: #2563eb;

    --text: #1a1a2e;
    --text-secondary: #4a5568;
    --text-muted: #718096;

    --bg: #fafbfc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --border: #e2e8f0;
    --border-light: #f1f5f9;

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);

    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark theme */
[data-theme="dark"] {
    --text: #e2e8f0;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --bg: #0f1729;
    --bg-secondary: #1a2332;
    --bg-tertiary: #243044;
    --border: #2d3748;
    --border-light: #1e2a3a;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
input, select, textarea, button { font-family: inherit; font-size: inherit; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px; border-radius: var(--radius); font-weight: 600; font-size: 0.9rem; border: none; cursor: pointer; transition: all var(--transition); text-decoration: none; letter-spacing: 0.01em; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-light); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-secondary { background: var(--bg-tertiary); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-sm { padding: 8px 16px; font-size: 0.8rem; }
.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-weight: 500; font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 6px; }
.form-control { width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); color: var(--text); transition: border-color var(--transition), box-shadow var(--transition); }
.form-control:focus { outline: none; border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(30,58,95,0.1); }
select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }

/* Alerts */
.alert { padding: 14px 18px; border-radius: var(--radius-sm); font-size: 0.875rem; margin-bottom: 20px; }
.alert-success { background: #ecfdf5; color: #065f46; }
.alert-danger { background: #fef2f2; color: #991b1b; }
.alert-warning { background: #fffbeb; color: #92400e; }
.alert-info { background: #eff6ff; color: #1e40af; }

/* Utility */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-2 { gap: 16px; }
.grid { display: grid; }
.hidden { display: none; }

/* Toast */
.toast { position: fixed; bottom: 20px; right: 20px; padding: 14px 20px; border-radius: 8px; font-size: 0.85rem; font-weight: 500; z-index: 9999; transform: translateY(100px); opacity: 0; transition: all 0.3s; }
.toast.show { transform: translateY(0); opacity: 1; }
.toast-success { background: #065f46; color: white; }
.toast-error { background: #991b1b; color: white; }
.toast-info { background: #1e40af; color: white; }

@media (max-width: 768px) {
    .btn-lg { padding: 14px 24px; }
    .hide-mobile { display: none; }
}