* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 48px;
    max-width: 480px;
    width: 100%;
    animation: fadeInUp 0.6s ease-out;
}

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

.logo {
    text-align: center;
    margin-bottom: 32px;
}

.logo h1 {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    line-height: 1.2;
}

.logo p {
    color: #6b7280;
    font-size: 14px;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 24px;
}

label {
    display: block;
    font-weight: 600;
    color: #374151;
    margin-bottom: 8px;
    font-size: 14px;
}

input[type="text"],
input[type="date"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: white;
    font-family: inherit;
    color: #1f2937;
}

input[type="text"]::placeholder {
    color: #9ca3af;
}

input[type="text"]:focus,
input[type="date"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input[type="date"] {
    cursor: pointer;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s;
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}

.gender-group {
    display: flex;
    gap: 12px;
}

.gender-option {
    flex: 1;
    position: relative;
}

.gender-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.gender-option label {
    display: block;
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 16px;
    margin-bottom: 0;
    color: #374151;
    user-select: none;
}

.gender-option label:hover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

.gender-option input[type="radio"]:checked + label {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 8px;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

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

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

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.submit-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

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

.submit-btn .btn-text {
    position: relative;
    z-index: 1;
}

.info-text {
    text-align: center;
    color: #6b7280;
    font-size: 13px;
    margin-top: 24px;
    line-height: 1.6;
}

/* 로딩 상태 */
.submit-btn.loading .btn-text::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% {
        content: '.';
    }
    40% {
        content: '..';
    }
    60%, 100% {
        content: '...';
    }
}

/* 반응형 디자인 */
@media (max-width: 480px) {
    .container {
        padding: 32px 24px;
        border-radius: 16px;
    }

    .logo h1 {
        font-size: 28px;
    }

    .submit-btn {
        font-size: 16px;
        padding: 14px;
    }
}

/* 에러 메시지 스타일 */
.error-message {
    color: #ef4444;
    font-size: 12px;
    margin-top: 4px;
    display: none;
}

.error-message.show {
    display: block;
}

.form-group.error input,
.form-group.error .gender-group {
    border-color: #ef4444;
}

.form-group.error input:focus {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* API 에러 메시지 */
.api-error {
    background: #fee2e2;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-size: 14px;
    border-left: 4px solid #dc2626;
    display: none;
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}