.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
    padding: 2rem 1rem;
}

.auth-card {
    width: 100%;
    max-width: 480px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--success));
    border-radius: 16px 16px 0 0;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.auth-logo h2 {
    margin: 0;
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text);
}

.auth-logo p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    position: relative;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(148, 163, 184, 0.05);
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    color: var(--text);
    font-size: 1rem;
    transition: all 0.3s ease;
    position: relative;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(31, 111, 235, 0.05);
    box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.1);
}

.form-input::placeholder {
    color: var(--muted);
}

.password-input-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: color 0.2s;
}

.password-toggle:hover {
    color: var(--text);
}

.input-focus-line {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.3s ease;
    border-radius: 1px;
}

.form-input:focus + .input-focus-line,
.form-input:focus ~ .input-focus-line {
    transform: scaleX(1);
}

.input-validation {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    min-height: 1.2rem;
}

.input-validation.success {
    color: var(--success);
}

.input-validation.error {
    color: var(--danger);
}

.password-strength {
    margin-top: 0.5rem;
}

.strength-bar {
    width: 100%;
    height: 4px;
    background: rgba(148, 163, 184, 0.2);
    border-radius: 2px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.strength-text {
    font-size: 0.85rem;
    margin-top: 0.25rem;
    color: var(--muted);
}

.checkbox-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--muted);
    line-height: 1.4;
}

.checkbox-wrapper input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--panel-border);
    border-radius: 4px;
    position: relative;
    transition: all 0.2s;
    flex-shrink: 0;
    margin-top: 2px;
}

.checkbox-wrapper input[type="checkbox"]:checked + .checkmark {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-wrapper input[type="checkbox"]:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.terms-link {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

.terms-link:hover {
    color: var(--accent);
}

.auth-btn {
    position: relative;
    width: 100%;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    overflow: hidden;
    margin-top: 0.5rem;
}

.auth-btn.primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-600));
    color: white;
    box-shadow: 0 4px 15px rgba(31, 111, 235, 0.3);
}

.auth-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(31, 111, 235, 0.4);
}

.auth-btn.primary:active {
    transform: translateY(0);
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s;
}

.auth-btn.loading .btn-text {
    opacity: 0;
}

.auth-btn.loading .btn-loader {
    opacity: 1;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.auth-divider {
    position: relative;
    text-align: center;
    margin: 1rem 0;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--panel-border);
}

.auth-divider span {
    background: var(--panel);
    padding: 0 1rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.social-login {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.875rem 1.5rem;
    background: rgba(148, 163, 184, 0.05);
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.social-btn:hover {
    background: rgba(148, 163, 184, 0.1);
    border-color: var(--muted);
}

.auth-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--panel-border);
}

.auth-footer p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.auth-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.auth-link:hover {
    color: var(--accent);
}

.messages-container {
    margin-bottom: 1.5rem;
}

.alert {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 0.875rem 1rem;
    border-radius: 10px;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    line-height: 1.4;
    border: 1px solid;
    animation: slideIn 0.3s ease-out;
}

.alert-content {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    flex: 1;
}

.alert-content svg {
    flex-shrink: 0;
    margin-top: 1px;
}

.alert-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    opacity: 0.7;
    transition: opacity 0.2s;
    margin-left: 0.5rem;
}

.alert-close:hover {
    opacity: 1;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
    color: #fcd34d;
}

.alert-info {
    background: rgba(31, 111, 235, 0.1);
    border-color: rgba(31, 111, 235, 0.3);
    color: #93c5fd;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 640px) {
    .auth-container {
        padding: 1rem;
    }

    .auth-card {
        padding: 2rem 1.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
}