/* ====================================
   AI Link - 회원가입 공통 스타일
   버전: 1.0
   작성일: 2025-10-27
   ==================================== */

/* ====================================
   1. 전역 스타일
   ==================================== */

:root {
    /* 색상 팔레트 */
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --primary-active: #004085;
    --secondary-color: #6c757d;
    --secondary-hover: #545b62;
    --success-color: #28a745;
    --success-hover: #218838;
    --error-color: #dc3545;
    --error-hover: #c82333;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    /* 배경 색상 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-dark: #343a40;
    
    /* 텍스트 색상 */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --text-light: #ffffff;
    
    /* 테두리 */
    --border-color: #dee2e6;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    
    /* 그림자 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    
    /* 간격 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* 폰트 */
    --font-main: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    
    /* 전환 효과 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: var(--font-main);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* ====================================
   2. 페이지 레이아웃
   ==================================== */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.auth-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xxl);
    width: 100%;
    max-width: 500px;
    animation: slideUp 0.4s ease;
}

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

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

.auth-logo {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.auth-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

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

/* ====================================
   3. 입력 필드
   ==================================== */

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

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group label .required {
    color: var(--error-color);
    margin-left: 2px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    font-size: var(--font-size-base);
    font-family: var(--font-main);
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-group input:disabled,
.form-group textarea:disabled,
.form-group select:disabled {
    background: var(--bg-secondary);
    color: var(--text-muted);
    cursor: not-allowed;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-group 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='%236c757d' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* 입력 필드 상태 */
.form-group.has-error input,
.form-group.has-error textarea,
.form-group.has-error select {
    border-color: var(--error-color);
}

.form-group.has-error input:focus,
.form-group.has-error textarea:focus,
.form-group.has-error select:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

.form-group.has-success input,
.form-group.has-success textarea,
.form-group.has-success select {
    border-color: var(--success-color);
}

/* 에러 메시지 */
.error-message {
    display: none;
    font-size: var(--font-size-sm);
    color: var(--error-color);
    margin-top: var(--spacing-xs);
}

.form-group.has-error .error-message {
    display: block;
}

/* 성공 메시지 */
.success-message {
    display: none;
    font-size: var(--font-size-sm);
    color: var(--success-color);
    margin-top: var(--spacing-xs);
}

.form-group.has-success .success-message {
    display: block;
}

/* 도움말 텍스트 */
.help-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* ====================================
   4. 버튼
   ==================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 24px;
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: var(--font-main);
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary 버튼 */
.btn-primary {
    background: var(--primary-color);
    color: var(--text-light);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    background: var(--primary-active);
    transform: translateY(0);
}

/* Secondary 버튼 */
.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--secondary-color);
}

/* Text 버튼 */
.btn-text {
    background: transparent;
    color: var(--primary-color);
    padding: 8px 12px;
}

.btn-text:hover:not(:disabled) {
    background: rgba(0, 123, 255, 0.05);
    color: var(--primary-hover);
}

/* 버튼 크기 */
.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
}

/* 로딩 상태 */
.btn[data-loading="true"] {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn[data-loading="true"]::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.btn-loading {
    display: none;
}

/* ====================================
   5. 체크박스 & 라디오
   ==================================== */

.checkbox-group,
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.checkbox-item,
.radio-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-item input[type="checkbox"],
.radio-item input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-item label,
.radio-item label {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
}

/* 커스텀 체크박스 */
.custom-checkbox {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.custom-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.custom-checkbox .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-primary);
    transition: all var(--transition-fast);
}

.custom-checkbox:hover .checkmark {
    border-color: var(--primary-color);
}

.custom-checkbox input:checked ~ .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.custom-checkbox input:checked ~ .checkmark::after {
    content: "";
    position: absolute;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* ====================================
   6. 역할 선택 카드
   ==================================== */

.role-select-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.role-card {
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.role-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.role-card.active {
    border-color: var(--primary-color);
    background: rgba(0, 123, 255, 0.05);
}

.role-card h3 {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.role-card input[type="radio"] {
    display: none;
}

/* ====================================
   7. 메시지 알림
   ==================================== */

.message-box {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    display: none;
    animation: slideDown 0.3s ease;
}

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

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

.message-box.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message-box.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message-box.warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.message-box.info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* ====================================
   8. 이메일 인증 UI
   ==================================== */

.verification-section {
    display: none;
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.verification-section.show {
    display: block;
    animation: slideDown 0.3s ease;
}

.verification-timer {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.verification-timer.warning {
    color: var(--warning-color);
}

.verification-timer.expired {
    color: var(--error-color);
}

.verification-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* ====================================
   9. 링크
   ==================================== */

.auth-link {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.auth-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* ====================================
   10. 반응형 디자인
   ==================================== */

@media (max-width: 768px) {
    .auth-container {
        padding: var(--spacing-md);
    }
    
    .auth-card {
        padding: var(--spacing-lg);
    }
    
    .auth-title {
        font-size: var(--font-size-lg);
    }
    
    .role-select-group {
        grid-template-columns: 1fr;
    }
    
    .verification-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
        --font-size-lg: 16px;
        --font-size-xl: 20px;
    }
    
    .auth-card {
        padding: var(--spacing-md);
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 10px 14px;
    }
}