:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f3f4f6;
    --surface: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --success: #16a34a;
    --success-bg: #f0fdf4;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: var(--text-main);
}

.login-container { width: 100%; max-width: 400px; padding: 20px; }

.login-card {
    background: var(--surface);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border);
}

.brand-header { text-align: center; margin-bottom: 32px; }
.brand-logo { width: 48px; height: 48px; color: var(--primary); margin-bottom: 16px; }
.brand-header h1 { font-size: 24px; font-weight: 600; margin-bottom: 8px; }
.brand-header p { color: var(--text-muted); font-size: 14px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-size: 14px; font-weight: 500; }
.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.2s;
    outline: none;
    font-family: inherit;
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.alert-error {
    background-color: var(--error-bg);
    border: 1px solid #fecaca;
    color: var(--error);
    padding: 12px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 20px;
    text-align: center;
    animation: fadeIn 0.3s ease-in;
}

.alert-success {
    background-color: var(--success-bg);
    border: 1px solid #bbf7d0;
    color: var(--success);
    padding: 12px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 20px;
    text-align: center;
    animation: fadeIn 0.3s ease-in;
}

.btn-submit {
    width: 100%;
    padding: 12px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 48px;
}
.btn-submit:hover { background-color: var(--primary-hover); }
.btn-submit:disabled { opacity: 0.7; cursor: not-allowed; }

.footer-links { margin-top: 24px; text-align: center; font-size: 13px; color: var(--text-muted); }
.footer-links a { color: var(--text-muted); text-decoration: none; margin: 0 6px; }
.footer-links a:hover { text-decoration: underline; color: var(--primary); }

.back-link { display: block; text-align: center; margin-top: 20px; font-size: 14px; color: var(--text-muted); text-decoration: none; }
.back-link:hover { color: var(--primary); }

.security-badge { margin-top: 30px; display: flex; justify-content: center; align-items: center; gap: 8px; color: var(--text-muted); font-size: 12px; }
.copyright { text-align: center; margin-top: 10px; color: #9ca3af; font-size: 11px; }

.loader {
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top: 2px solid #fff;
    width: 18px;
    height: 18px;
    animation: spin 1s linear infinite;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }