/* 기본 스타일 및 CSS 변수 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
}

:root {
    /* 배경 및 텍스트 */
    --body-bg: #fff;
    --text-color: #111;
    --text-muted: rgba(0, 0, 0, 0.7);
    /* 컨테이너 */
    --container-bg: rgba(0, 0, 0, 0.75);
    --container-border: rgba(255, 255, 255, 0.15);
    /* 입력 필드 */
    --input-bg: rgba(0, 0, 0, 0.1);
    --input-border: rgba(0, 0, 0, 0.2);
    --input-focus-bg: rgba(0, 0, 0, 0.15);
    --input-focus-border: rgba(0, 0, 0, 0.3);
    /* 레이블 */
    --label-bg: rgba(0, 0, 0, 0.6);
    /* 버튼 (모든 로그인 관련 버튼에 동일하게 적용) */
    --button-bg: rgba(240, 240, 240, 0.9);
    --button-color: #000;
    --button-hover-bg: rgba(0, 0, 0, 1);
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

/* body 스타일 */
body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    -webkit-justify-content: center;
    align-items: center;
    -webkit-align-items: center;
    background: var(--body-bg);
    position: relative;
    overflow-y: auto;
}

    body .container {
        width: 100%;
        height: 100%;
    }

/* 배경 캔버스 스타일 */
#gradient-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0;
    transition: opacity 2s ease;
    -webkit-transition: opacity 2s ease;
    display: block;
}

/* 로그인 페이지 컨테이너 */
.loginpage-container {
    width: 100%;
}

/* 로그인 컨테이너 (항상 400px 폭, 작은 화면에서는 축소) */
.login-container {
    backdrop-filter: blur(12px);
    border-radius: 24px;
    -webkit-border-radius: 24px;
    border: 1px solid var(--container-border);
    padding: 1rem;
    width: 100%;
    max-width: 400px;
    margin: 1rem auto;
    transform: translateY(20px);
    -webkit-transform: translateY(20px);
    opacity: 0;
    animation: slideUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    -webkit-animation: slideUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    animation-delay: 0.5s;
    -webkit-animation-delay: 0.5s;
}

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

    .login-header h1 {
        color: var(--text-color);
        font-size: 2.2rem;
        font-weight: 600;
        margin-bottom: 0.5rem;
        text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    }

    .login-header img {
        width: auto;
        height: 4rem;
    }

    .login-header p {
        color: var(--text-muted);
        font-size: 1rem;
    }

/* 입력 필드 및 폼 그룹 */
.input-group,
.form-group {
    margin-bottom: 1rem;
}

    .input-group label,
    .form-group label {
        display: block;
        color: var(--text-color);
        margin-bottom: 0.5rem;
        font-size: 0.95rem;
        font-weight: 500;
    }

    .input-field,
    .form-group input {
        width: 100%;
        background: #f0f0f0;
        border: none;
        border-radius: 3.75rem;
        -webkit-border-radius: 3.75rem;
        padding: 0.9rem 1rem;
        color: var(--text-color);
        font-size: 1rem;
        transition: all 0.3s ease;
        -webkit-transition: all 0.3s ease;
    }

        .input-field:focus,
        .form-group input:focus {
            outline: none;
            border-color: none;
        }

        .input-field::placeholder,
        .form-group input::placeholder {
        }

.form-group {
    position: relative;
}

    .form-group label {
        position: absolute;
        top: -0.7rem;
        left: 1rem;
        background: var(--label-bg);
        padding: 0 0.25rem;
        color: rgba(255, 255, 255, 0.85);
        font-size: 0.8rem;
    }


/* 옵션 영역 및 체크박스 스타일 */
.options-group,
.form-check-group {
    display: flex;
    justify-content: space-between;
    -webkit-justify-content: space-between;
    align-items: center;
    -webkit-align-items: center;
    margin: 1.5rem 0;
}

.options-group {
    flex-wrap: wrap;
    -webkit-flex-wrap: wrap;
    row-gap: 10px;
}

.register-group {
    padding-right: 10px;
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    justify-content: end;
    -webkit-justify-content: end;
}

    .register-group a {
        font-size: 1rem;
        color: #646464;
        padding: 0 5px;
        text-decoration: none;
        -webkit-text-decoration: none;
        white-space: nowrap;
    }

        .register-group a:hover {
            color: #6e4aff;
        }


.checkbox-group {
    flex: 1;
    padding: 0 10px;
}

    .checkbox-group label {
        white-space: nowrap;
    }
/* 체크박스 및 레이블 가독성 개선 */
.checkbox-group,
.form-check-group {
    display: flex;
    align-items: center;
    -webkit-align-items: center;
    gap: 0.5rem;
}

    .checkbox-group input[type="checkbox"],
    .form-check-group input[type="checkbox"] {
        width: 1.2rem;
        height: 1.2rem;
        border-radius: 4px;
        -webkit-border-radius: 4px;
        border: 1px solid var(--input-border);
        background: var(--input-bg);
        cursor: pointer;
        margin-right: 0.5rem;
    }

    .checkbox-group label,
    .form-check-group label {
        color: var(--text-color);
        font-size: 1rem;
        font-weight: 500;
        cursor: pointer;
    }

/* 비밀번호 찾기 링크 */


/* 모든 로그인 관련 버튼에 통일된 스타일 적용 */
.login-button,
.select-btn,
.switch-btn,
.btn-login,
.btn-phone-verify,
.btn-external,
.btn-signup {
    display: inline-block;
    width: 100%;
    background: var(--button-bg);
    color: var(--button-color);
    border: none;
    border-radius: 30px;
    -webkit-border-radius: 30px;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    -webkit-transition: all 0.3s ease;
    margin-bottom: 1rem;
    text-align: center;
    line-height: 1.2;
    text-decoration: none;
}

    .login-button:hover,
    .select-btn:hover,
    .switch-btn:hover,
    .btn-login:hover,
    .btn-phone-verify:hover,
    .btn-external:hover,
    .btn-signup:hover {
        transform: translateY(-2px);
        -webkit-transform: translateY(-2px);
        box-shadow: var(--box-shadow);
        -webkit-box-shadow: var(--box-shadow);
    }

.login-button {
    color: #fff;
    background: #7118FF;
    padding: 1rem;
}
/* 로그인 푸터 */
.login-footer {
    text-align: center;
    color: #111;
    font-size: 0.95rem;
}

    .login-footer a {
        color: var(--text-color);
        text-decoration: none;
        font-weight: 500;
        margin-left: 0.5rem;
        transition: opacity 0.3s ease;
        -webkit-transition: opacity 0.3s ease;
    }

        .login-footer a:hover {
            opacity: 0.8;
        }

/* 선택 화면 스타일 (문구 및 선택 버튼) */
.selection-screen {
    display: block; /* 초기 상태에 따라 active 클래스로 제어 */
    text-align: center;
    margin-bottom: 2rem;
}

    .selection-screen .instruction {
        margin-bottom: 1.5rem;
        font-size: 1.2rem;
        color: var(--text-color);
    }

/* 애니메이션 */
@keyframes slideUp {
    0% {
        transform: translateY(20px);
        -webkit-transform: translateY(20px);
        opacity: 0;
    }

    100% {
        transform: translateY(0);
        -webkit-transform: translateY(0);
        opacity: 1;
    }
}

/* 선택 및 로그인 섹션 (모든 로그인 방식에 동일한 박스 크기 적용) */
.selection-screen,
.login-section {
    display: none;
}

    .selection-screen.active,
    .login-section.active {
        display: block;
    }


hr {
    border: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    margin: 1rem 0;
}