/* ===== 인증 페이지 공통 스타일 ===== */

/* 배경 */
.auth-background {
    position: fixed;
    inset: 0;
    z-index: -1;
    background: linear-gradient(
        135deg,
        var(--color-bg-primary) 0%,
        #1a0a0a 50%,
        var(--color-bg-primary) 100%
    );
}

/* 인증 페이지 컨테이너 */
.auth-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem;
}

/* 인증 카드 */
.auth-card {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    background: rgba(20, 20, 20, 0.95);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
}

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

.auth-logo {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 0.05em;
    background: linear-gradient(135deg, #fff 0%, var(--color-brand-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    display: block;
    text-decoration: none;
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0;
}

.auth-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: 0.5rem;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-brand-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-brand-primary-rgb), 0.2);
}

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

.form-input.error {
    border-color: var(--color-error);
}

.form-error {
    font-size: 0.75rem;
    color: var(--color-error);
    display: none;
}

.form-input.error + .form-error {
    display: block;
}

/* 비밀번호 토글 */
.password-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: 0.25rem;
}

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

/* 옵션 행 */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--color-text-secondary);
}

.remember-me input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-brand-primary);
}

.forgot-password {
    color: var(--color-brand-primary);
    font-size: 0.875rem;
}

.forgot-password:hover {
    text-decoration: underline;
}

/* 제출 버튼 */
.auth-submit {
    width: 100%;
    padding: 1rem;
    margin-top: 0.5rem;
}

/* 구분선 */
.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

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

.auth-divider span {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
}

/* 소셜 로그인 */
.social-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.btn-social {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.875rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-social:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-border-light);
}

.btn-social img,
.btn-social svg {
    width: 20px;
    height: 20px;
}

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

.auth-footer p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

.auth-footer a {
    color: var(--color-brand-primary);
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* 뒤로가기 */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.back-link:hover {
    color: var(--color-text-primary);
}

/* 반응형 */
@media (min-width: 768px) {
    .auth-card {
        padding: 3rem;
    }
}