.box-container {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height:700px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    padding: 40px;
    width: 100%;
    max-width: 450px;
    transition: all 0.3s ease;
}

.login-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.tab-container {
    display: flex;
    margin-bottom: 30px;
    background: #f8f9ff;
    border-radius: 15px;
    padding: 5px;
}

.tab {
    flex: 1;
    text-align: center;
    padding: 15px;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s ease;
    font-weight: 600;
    color: #666;
    /* 모바일 터치 개선 */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.tab.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    transform: scale(1.02);
}

.form-section {
    display: none;
    position: relative;
}

.form-section.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
}

input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: white;
}

input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    /* 모바일 터치 개선 - 핵심 추가사항 */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.error {
    color: #e74c3c;
    font-size: 14px;
    margin-top: 5px;
    display: block;
}

.step-indicator {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    padding: 0 20px;
}

.step {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #e1e8ed;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #999;
    position: relative;
}

.step.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 100%;
    top: 50%;
    width: calc(100% + 10px);
    height: 2px;
    background: #e1e8ed;
    transform: translateY(-50%);
}

.password-requirements {
    background: #f8f9ff;
    padding: 15px;
    border-radius: 10px;
    margin-top: 10px;
    font-size: 14px;
}

.requirement {
    margin: 5px 0;
    display: flex;
    align-items: center;
}

.requirement::before {
    content: '✗';
    color: #e74c3c;
    margin-right: 8px;
    font-weight: bold;
}

.requirement.valid::before {
    content: '✓';
    color: #27ae60;
}

.verification-code {
    text-align: center;
    padding: 20px;
    background: #f8f9ff;
    border-radius: 15px;
    margin: 20px 0;
}

.code-display {
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
    letter-spacing: 5px;
    margin: 10px 0;
}

.step-content {
    display: none;
}

.step-content.active {
    display: block;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

.login-prolonging-group{
    text-align: left;
}

.login-prolonging-group > label {
    display: inline;
}

#loginProlonging {
    width:20px;
}

.login-fail-alert-container {
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    min-height: 150px;
    background-color: #fff;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    font-family: 'Noto Sans KR', sans-serif;
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.login-fail-alert-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    background-color: transparent;
    border: none;
    color: #888;
    font-size: 24px;
    font-weight: bold;
    line-height: 1;
    cursor: pointer;
    border-radius: 50%;
    transition: background-color 0.2s ease, color 0.2s ease;
    text-align: center;
    /* 모바일 터치 개선 */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.login-fail-alert-close:hover {
    background-color: #eee;
    color: #111;
}

.login-fail-alert-message {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #333;
    font-size: 16px;
    line-height: 1.5;
    word-break: keep-all;
    padding: 0 1rem;
}

/* 비밀번호 토글 버튼 스타일 */
.password-input-container {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input-container input {
    padding-right: 45px;
    width: 100%;
}

.password-toggle {
    position: absolute;
    right: 15px;
    cursor: pointer;
    user-select: none;
    font-size: 18px;
    color: #666;
    z-index: 1;
    /* 모바일 터치 개선 */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.password-toggle:hover {
    color: #333;
}

/* 모바일에서만 적용되는 최소한의 개선 */
@media screen and (max-width: 768px) {
    input {
        font-size: 16px; /* iOS 줌 방지 */
    }

    .btn {
        min-height: 48px; /* 터치하기 쉬운 크기 */
    }

    .login-fail-alert-container {
        width: 90%;
        max-width: 320px;
    }

    .password-toggle {
        font-size: 20px;
        padding: 8px;
        margin-right: -8px;
        min-height: 36px;
        min-width: 36px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* 비밀번호 찾기 모달 스타일 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}
.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    position: relative;
}
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}
.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
}
.forgot-password-link {
    color: #3b82f6;
    text-decoration: none;
    font-size: 14px;
    display: inline-block;
    margin-top: 10px;
}
.forgot-password-link:hover {
    text-decoration: underline;
}
.modal-step {
    display: none;
}
.modal-step.active {
    display: block;
}
.requirement {
    color: #dc2626;
}
.requirement.valid {
    color: #059669;
}
.requirement.valid:before {
    content: "✓ ";
}
.requirement:not(.valid):before {
    content: "✗ ";
}