:root {
    --primary: #ff6b35;
    --danger: #dc3545;
    --danger-dark: #b02a37;
    --success: #28a745;
    --info: #0066cc;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-800: #212529;
    --radius: 10px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: linear-gradient(135deg, #f5f6fa 0%, #ffffff 100%);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    max-width: 480px;
    width: 100%;
}

.card {
    background: white;
    border-radius: var(--radius);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.header {
    padding: 36px 30px;
    background: linear-gradient(135deg, #2b2d42 0%, #4a4e69 100%);
    color: white;
    text-align: center;
}

.header h1 {
    font-size: 24px;
    margin-bottom: 6px;
    font-weight: 700;
}

.header p {
    font-size: 13px;
    opacity: 0.85;
}

.content {
    padding: 32px 30px;
}

/* State visibility */
.state {
    display: none;
}

.state.active {
    display: block;
}

/* Loading */
.state-loading {
    text-align: center;
    padding: 30px 0;
}

.loader-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--gray-600);
    font-size: 14px;
}

/* Login state */
.intro-text {
    font-size: 14px;
    color: var(--gray-600);
    margin-bottom: 20px;
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 20px 0;
    color: var(--gray-600);
    font-size: 13px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--gray-300);
}

.divider span {
    padding: 0 12px;
}

.social-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.hidden {
    display: none;
}

#passwordLoginForm .form-group,
#fallbackForm .form-group {
    margin-bottom: 14px;
}

.form-hint {
    font-size: 13px;
    color: var(--gray-600);
    margin-bottom: 12px;
}

.form-error {
    color: var(--danger);
    font-size: 13px;
    margin-top: 8px;
    min-height: 18px;
}

.fallback-link {
    text-align: center;
    font-size: 13px;
    margin-top: 4px;
}

.fallback-link a {
    color: var(--gray-600);
}

/* Forms */
.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
}

.form-group input[type="email"],
.form-group input[type="password"] {
    padding: 11px 14px;
    border: 1.5px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.form-group.checkbox {
    flex-direction: row;
    gap: 10px;
    align-items: flex-start;
    margin: 20px 0;
}

.form-group.checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    cursor: pointer;
    accent-color: var(--danger);
    flex-shrink: 0;
}

.form-group.checkbox label {
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-block {
    width: 100%;
}

.btn-primary {
    background: var(--gray-800);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: #000;
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-300);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-dark);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 24px;
}

.button-group .btn {
    flex: 1;
}

/* Warning / Info / Error boxes */
.warning-box {
    background: #fff3cd;
    border: 1.5px solid #ffc107;
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 8px;
}

.warning-box h3 {
    font-size: 15px;
    margin-bottom: 10px;
}

.warning-box ul {
    list-style: none;
    font-size: 13px;
}

.warning-box li {
    margin-bottom: 6px;
    padding-left: 16px;
    position: relative;
}

.warning-box li::before {
    content: "•";
    position: absolute;
    left: 2px;
    font-weight: bold;
}

.account-ref {
    font-size: 12px;
    color: var(--gray-600);
    margin-top: 10px;
    word-break: break-all;
}

.account-ref code {
    background: rgba(0,0,0,0.05);
    padding: 2px 6px;
    border-radius: 4px;
}

.info-box {
    background: #e7f3ff;
    border-left: 4px solid var(--info);
    border-radius: var(--radius);
    padding: 18px;
    color: #003d99;
}

.info-box p {
    margin-bottom: 8px;
    font-size: 14px;
}

.small-text {
    font-size: 12px;
    color: var(--gray-600) !important;
}

.alert-error {
    background: #f8d7da;
    border-left: 4px solid var(--danger);
    border-radius: var(--radius);
    padding: 18px;
    color: #721c24;
}

.alert-error h3 {
    font-size: 15px;
    margin-bottom: 8px;
}

.alert-error p {
    font-size: 14px;
}

/* Success / Done */
.state-done {
    text-align: center;
    padding: 10px 0;
}

.success-icon {
    width: 52px;
    height: 52px;
    background: var(--success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 26px;
}

.state-done h2 {
    color: var(--success);
    font-size: 20px;
    margin-bottom: 8px;
}

.state-done p {
    font-size: 14px;
    color: var(--gray-600);
}

/* Footer */
.footer-note {
    text-align: center;
    font-size: 12px;
    color: var(--gray-600);
    margin-top: 20px;
}

.footer-note a {
    color: var(--primary);
}

/* Responsive */
@media (max-width: 480px) {
    .header {
        padding: 28px 20px;
    }
    .content {
        padding: 26px 20px;
    }
    .button-group {
        flex-direction: column;
    }
}