:root {
    --ozon-blue: #005BFF;
    --ozon-dark-blue: #003D99;
    --ozon-light-blue: #E6F2FF;
    --ozon-gray: #6B7280;
    --ozon-dark-gray: #374151;
    --ozon-white: #FFFFFF;
    --ozon-border: #E5E7EB;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-sans); min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--ozon-light-blue) 0%, #F0F9FF 100%); padding: 20px; }
.login-box { background: var(--ozon-white); border-radius: 16px; box-shadow: 0 10px 40px rgba(0,0,0,0.08); padding: 40px; width: 100%; max-width: 400px; border: 1px solid var(--ozon-border); }
.login-box h1 { font-size: 24px; color: var(--ozon-dark-gray); margin-bottom: 8px; }
.login-box p { color: var(--ozon-gray); font-size: 14px; margin-bottom: 24px; }
.login-error { background: #fee2e2; color: #991b1b; padding: 12px; border-radius: 8px; margin-bottom: 20px; font-size: 14px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--ozon-dark-gray); font-size: 14px; }
.form-group input { width: 100%; padding: 12px 14px; border: 1px solid var(--ozon-border); border-radius: 8px; font-size: 16px; }
.form-group input:focus { outline: none; border-color: var(--ozon-blue); box-shadow: 0 0 0 3px rgba(0,91,255,0.15); }
.btn { width: 100%; padding: 14px; border: none; border-radius: 8px; font-size: 16px; font-weight: 600; cursor: pointer; font-family: inherit; transition: all 0.2s; }
.btn-primary { background: var(--ozon-blue); color: white; }
.btn-primary:hover { background: var(--ozon-dark-blue); }
.back-link { display: inline-block; margin-top: 20px; color: var(--ozon-blue); text-decoration: none; font-size: 14px; }
.back-link:hover { text-decoration: underline; }