/* ==========================================================================
   KEYWORK v4 - Auth Pages (Login, Signup)
   ========================================================================== */

/* ========== Auth Container ========== */

.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 64px - 200px);
    padding: var(--spacing-4) 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.02) 0%, rgba(147, 51, 234, 0.02) 100%);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    padding: var(--spacing-6) var(--spacing-8);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    transition: box-shadow var(--transition-base);
}

.auth-card:hover {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.auth-card__header {
    text-align: center;
    margin-bottom: var(--spacing-4);
}

.auth-card__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-1);
}

.auth-card__subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.auth-card__footer {
    margin-top: var(--spacing-4);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.auth-card__footer p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.auth-card__footer a {
    color: var(--color-primary-500);
    font-weight: var(--font-weight-semibold);
    transition: color var(--transition-fast);
}

.auth-card__footer a:hover {
    color: var(--color-primary-600);
    text-decoration: underline;
}

/* ========== Auth Form ========== */

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.form-label.required::after {
    content: '*';
    color: var(--color-error-500);
    font-size: var(--font-size-sm);
}

.form-input,
.form-select {
    width: 100%;
    height: 44px;
    padding: 0 var(--spacing-3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-input:hover,
.form-select:hover {
    border-color: var(--color-primary-300);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    background-color: var(--bg-primary);
    transform: translateY(-1px);
}

.form-input::placeholder {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.form-select {
    cursor: pointer;
    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 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-select option {
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

/* ========== Checkbox ========== */

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.form-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    cursor: pointer;
    flex-shrink: 0;
}

.form-checkbox input[type="checkbox"]:checked {
    background-color: var(--color-primary-500);
    border-color: var(--color-primary-500);
}

.form-checkbox span {
    flex: 1;
}

.form-checkbox a {
    color: var(--color-primary-500);
    font-weight: var(--font-weight-medium);
    text-decoration: underline;
}

.form-checkbox a:hover {
    color: var(--color-primary-600);
}

/* ========== Form Helper & Messages ========== */

.form-help {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 0;
    line-height: 1.3;
}

.form-error {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    color: var(--color-error-600);
    font-size: var(--font-size-sm);
    animation: slideDown 0.3s ease;
}

.form-error i {
    flex-shrink: 0;
}

.form-success {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background-color: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-md);
    color: var(--color-success-600);
    font-size: var(--font-size-sm);
    animation: slideDown 0.3s ease;
}

.form-success i {
    flex-shrink: 0;
}

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

/* ========== Buttons ========== */

.btn--lg {
    height: 46px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    margin-top: var(--spacing-2);
}

.btn--lg::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn--lg:hover::before {
    width: 300px;
    height: 300px;
}

.btn--lg:active {
    transform: scale(0.98);
}

/* ========== Additional Enhancements ========== */

.auth-card__title {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.form-label {
    letter-spacing: 0.01em;
}

/* Input error state */
.form-input.error {
    border-color: var(--color-error-500);
}

.form-input.error:focus {
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

/* Loading state */
.btn--lg.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn--lg.loading::after {
    content: '';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: translateY(-50%) rotate(360deg);
    }
}

/* ========== Mobile Styles ========== */

@media (max-width: 768px) {
    .auth-container {
        padding: var(--spacing-6) 0;
        background: var(--bg-primary);
    }

    .auth-card {
        margin: 0;
        padding: var(--spacing-8);
        border: 1px solid var(--border-color);
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    }

    .auth-card:hover {
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    }

    .auth-card__header {
        padding-top: var(--spacing-2);
    }

    .auth-card__title {
        font-size: var(--font-size-xl);
    }

    .auth-card__subtitle {
        font-size: var(--font-size-sm);
    }

    .form-input,
    .form-select {
        height: 48px;
        font-size: var(--font-size-base);
    }

    .btn--lg {
        height: 52px;
    }

    .form-help {
        font-size: 11px;
    }

    .social-login {
        margin-top: var(--spacing-4);
    }

    .btn--social {
        height: 52px;
    }
}

/* ========== Social Login ========== */

.social-login {
    margin-top: var(--spacing-5);
}

.social-login__divider {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-4);
}

.social-login__divider::before,
.social-login__divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

.social-login__divider span {
    padding: 0 var(--spacing-3);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.btn--social {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    width: 100%;
    height: 46px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn--kakao {
    background-color: #FEE500;
    color: #3C1E1E;
    border: none;
}

.btn--kakao:hover {
    background-color: #f0d900;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(254, 229, 0, 0.4);
}

.btn--kakao:active {
    transform: scale(0.98);
}

.btn--kakao svg {
    flex-shrink: 0;
}

.btn--naver {
    background-color: #03C75A;
    color: #fff;
    border: none;
}

.btn--naver:hover {
    background-color: #02b351;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(3, 199, 90, 0.3);
}

.btn--naver:active {
    transform: scale(0.98);
}

.btn--naver svg {
    flex-shrink: 0;
}