/*
 * 파일명: index.css
 * 위치: /assets/css/index.css
 * 기능: QR코드 생성기 메인 스타일시트
 * 작성일: 2025-07-09
 */

/* ===================================
 * 기본 설정 및 변수
 * ===================================
 */
:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-family: "Segoe UI", 'Noto Sans KR', -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ===================================
 * 기본 스타일 리셋
 * ===================================
 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
 * 히어로 섹션
 * ===================================
 */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 40px 0 30px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.05"><circle cx="30" cy="30" r="2"/></g></svg>');
    pointer-events: none;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.hero-title i {
    font-size: 2rem;
}

.hero-subtitle {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0;
    font-weight: 400;
}

/* ===================================
 * 메인 섹션
 * ===================================
 */
.main-section {
    padding-top: 40px;
    margin-top: -20px;
    position: relative;
    z-index: 2;
}

/* ===================================
 * 컨트롤 패널
 * ===================================
 */
.control-panel {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.panel-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 24px 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.panel-header i {
    font-size: 1.25rem;
}

.panel-body {
    padding: 30px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ===================================
* 폼 그룹 및 입력 필드
* ===================================
*/
.form-group {
   margin-bottom: 28px;
}

.form-group:last-child {
   margin-bottom: 0;
}

.form-label {
   display: block;
   font-weight: 600;
   font-size: 0.95rem;
   color: var(--gray-700);
   margin-bottom: 12px;
   letter-spacing: -0.025em;
}

.input-wrapper {
   position: relative;
   display: flex;
   align-items: stretch;
}

.input-icon {
   display: flex;
   align-items: center;
   justify-content: center;
   width: 50px;
   background: var(--gray-50);
   border: 2px solid var(--gray-200);
   border-right: none;
   border-radius: var(--border-radius) 0 0 var(--border-radius);
   color: var(--gray-500);
   transition: var(--transition);
}

.form-input {
   flex: 1;
   padding: 14px 16px;
   border: 2px solid var(--gray-200);
   border-left: none;
   border-radius: 0 var(--border-radius) var(--border-radius) 0;
   font-size: 0.95rem;
   font-family: var(--font-family);
   background: var(--white);
   color: var(--gray-800);
   transition: var(--transition);
   outline: none;
}

.form-input:focus {
   border-color: var(--primary-color);
   box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-input:focus + .input-icon,
.input-wrapper:focus-within .input-icon {
   border-color: var(--primary-color);
   background: rgba(102, 126, 234, 0.05);
   color: var(--primary-color);
}

.form-input::placeholder {
   color: var(--gray-400);
   font-weight: 400;
}

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

select.form-input {
   cursor: pointer;
}

/* ===================================
* 타입 선택기
* ===================================
*/
.type-selector {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 16px;
}

.type-card {
   display: flex;
   align-items: center;
   gap: 16px;
   padding: 20px;
   border: 2px solid var(--gray-200);
   border-radius: var(--border-radius);
   background: var(--white);
   cursor: pointer;
   transition: var(--transition);
   position: relative;
   overflow: hidden;
}

.type-card::before {
   content: '';
   position: absolute;
   top: 0;
   left: -100%;
   width: 100%;
   height: 100%;
   background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
   transition: left 0.5s ease;
}

.type-card:hover::before {
   left: 100%;
}

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

.type-card.active {
   border-color: var(--primary-color);
   background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
   box-shadow: var(--shadow-md);
}

.type-icon {
   display: flex;
   align-items: center;
   justify-content: center;
   width: 50px;
   height: 50px;
   background: var(--gray-100);
   border-radius: var(--border-radius);
   color: var(--gray-600);
   transition: var(--transition);
}

.type-card.active .type-icon {
   background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
   color: var(--white);
}

.type-icon i {
   font-size: 1.5rem;
}

.type-info {
   flex: 1;
}

.type-title {
   font-weight: 600;
   font-size: 1rem;
   color: var(--gray-800);
   margin-bottom: 4px;
}

.type-desc {
   font-size: 0.875rem;
   color: var(--gray-500);
   font-weight: 400;
}

/* ===================================
* 색상 선택기
* ===================================
*/
.color-selector {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 20px;
}

.color-item {
   display: flex;
   flex-direction: column;
}

.color-label {
   font-size: 0.875rem;
   font-weight: 500;
   color: var(--gray-600);
   margin-bottom: 8px;
}

.color-wrapper {
   position: relative;
   display: flex;
   align-items: center;
   height: 50px;
   border: 2px solid var(--gray-200);
   border-radius: var(--border-radius);
   overflow: hidden;
   transition: var(--transition);
}

.color-wrapper:hover {
   border-color: var(--primary-color);
}

.color-input {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   opacity: 0;
   cursor: pointer;
}

.color-preview {
   width: 100%;
   height: 100%;
   display: flex;
   align-items: center;
   justify-content: center;
   font-size: 0.875rem;
   font-weight: 500;
   color: var(--gray-600);
   transition: var(--transition);
   border: 2px solid var(--white);
   box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1);
}

/* ===================================
 * 버튼 그룹
 * ===================================
 */
.button-group {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    margin-top: auto;
    padding-top: 20px;
}

.btn-primary,
.btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-200);
    border-color: var(--gray-300);
}

/* ===================================
 * 결과 패널
 * ===================================
 */
.result-panel {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* ===================================
* QR 코드 결과 영역
* ===================================
*/
.qr-placeholder,
.qr-loading,
.qr-result {
   min-height: 500px;
   display: flex;
   align-items: center;
   justify-content: center;
   padding: 40px;
   background: var(--gray-50);
}

.placeholder-content {
   text-align: center;
   opacity: 0.6;
}

.placeholder-icon {
   margin-bottom: 16px;
}

.placeholder-icon i {
   font-size: 4rem;
   color: var(--gray-300);
}

.placeholder-text {
   font-size: 1.125rem;
   color: var(--gray-500);
   font-weight: 500;
}

/* 로딩 상태 */
.loading-content {
   text-align: center;
}

.loading-spinner {
   margin-bottom: 16px;
}

.spinner {
   width: 50px;
   height: 50px;
   border: 4px solid var(--gray-200);
   border-top: 4px solid var(--primary-color);
   border-radius: 50%;
   animation: spin 1s linear infinite;
}

@keyframes spin {
   0% { transform: rotate(0deg); }
   100% { transform: rotate(360deg); }
}

.loading-text {
   font-size: 1.125rem;
   color: var(--gray-600);
   font-weight: 500;
}

/* 결과 영역 */
.qr-result {
   background: var(--white);
   flex-direction: column;
}

.result-content {
   text-align: center;
   width: 100%;
}

.qr-canvas-wrapper {
   margin-bottom: 32px;
   display: flex;
   justify-content: center;
   align-items: center;
   padding: 20px;
   background: var(--white);
   border-radius: var(--border-radius-lg);
   box-shadow: var(--shadow-lg);
   border: 1px solid var(--gray-200);
}

#qr-canvas {
   max-width: 100%;
   height: auto;
   border-radius: var(--border-radius);
}

.result-actions {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 12px;
   margin-bottom: 20px;
}

.btn-download,
.btn-copy {
   display: flex;
   align-items: center;
   justify-content: center;
   gap: 8px;
   padding: 14px 20px;
   border: none;
   border-radius: var(--border-radius);
   font-size: 0.95rem;
   font-weight: 600;
   font-family: var(--font-family);
   cursor: pointer;
   transition: var(--transition);
}

.btn-download {
   background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
   color: var(--white);
   box-shadow: var(--shadow-sm);
}

.btn-download:hover {
   transform: translateY(-1px);
   box-shadow: var(--shadow-md);
}

.btn-copy {
   background: var(--gray-100);
   color: var(--gray-700);
   border: 2px solid var(--gray-200);
}

.btn-copy:hover {
   background: var(--gray-200);
   border-color: var(--gray-300);
}

.result-info {
   display: flex;
   align-items: center;
   justify-content: center;
   gap: 8px;
   font-size: 0.875rem;
   color: var(--gray-500);
   font-weight: 400;
}

.result-info i {
   font-size: 1rem;
}

/* ===================================
 * 광고 섹션
 * ===================================
 */
.ad-section {
    padding: 40px 0;
    background: var(--gray-100);
}

.ad-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    min-height: 280px;
}

/* 반응형 조정 */
@media (max-width: 768px) {
    .ad-section {
        padding: 30px 0;
    }
    
    .ad-container {
        padding: 15px;
        min-height: 250px;
    }
}

@media (max-width: 576px) {
    .ad-section {
        padding: 20px 0;
    }
    
    .ad-container {
        padding: 10px;
        min-height: 200px;
    }
}

/* ===================================
* 가이드 섹션
* ===================================
*/
.guide-section {
   padding: 40px 0 60px;
   background: var(--white);
}

.guide-panel {
   background: var(--white);
   border-radius: var(--border-radius-xl);
   box-shadow: var(--shadow-lg);
   overflow: hidden;
   border: 1px solid var(--gray-200);
}

.guide-header {
   background: linear-gradient(135deg, var(--gray-700) 0%, var(--gray-800) 100%);
   color: var(--white);
   padding: 24px 30px;
   display: flex;
   align-items: center;
   gap: 12px;
   font-weight: 600;
   font-size: 1.125rem;
}

.guide-content {
   padding: 40px 30px;
}

.guide-steps {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
   gap: 32px;
}

.guide-step {
   display: flex;
   align-items: flex-start;
   gap: 16px;
   text-align: left;
}

.step-number {
   display: flex;
   align-items: center;
   justify-content: center;
   width: 50px;
   height: 50px;
   background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
   color: var(--white);
   border-radius: 50%;
   font-size: 1.25rem;
   font-weight: 700;
   flex-shrink: 0;
   box-shadow: var(--shadow-md);
}

.step-info {
   flex: 1;
   padding-top: 4px;
}

.step-title {
   font-size: 1.125rem;
   font-weight: 600;
   color: var(--gray-800);
   margin-bottom: 8px;
}

.step-desc {
   font-size: 0.95rem;
   color: var(--gray-600);
   line-height: 1.6;
}

/* ===================================
* 반응형 디자인
* ===================================
*/
@media (max-width: 1200px) {
   .hero-title {
       font-size: 1.875rem;
   }
   
   .hero-subtitle {
       font-size: 0.95rem;
   }
}

@media (max-width: 992px) {
   .hero-section {
       padding: 35px 0 25px;
   }
   
   .hero-title {
       font-size: 1.75rem;
   }
   
   .main-section {
       padding: 35px 0;
       margin-top: -15px;
   }
  
   .panel-body {
       padding: 24px;
   }
  
   .guide-steps {
       grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
       gap: 24px;
   }
}

@media (max-width: 768px) {
   .hero-title {
       font-size: 1.5rem;
       flex-direction: column;
       gap: 8px;
   }
   
   .hero-title i {
       font-size: 1.75rem;
   }
  
   .hero-subtitle {
       font-size: 0.9rem;
   }
   
   .main-section {
       margin-top: -10px;
   }
  
   .type-selector {
       grid-template-columns: 1fr;
   }
  
   .color-selector {
       grid-template-columns: 1fr;
       gap: 16px;
   }
  
   .button-group {
       grid-template-columns: 1fr;
   }
  
   .result-actions {
       grid-template-columns: 1fr;
   }
  
   .guide-steps {
       grid-template-columns: 1fr;
       gap: 20px;
   }
  
   .guide-step {
       flex-direction: row;
       text-align: left;
       gap: 16px;
       align-items: flex-start;
   }
   
   .step-number {
       width: 40px;
       height: 40px;
       font-size: 1.125rem;
       flex-shrink: 0;
   }
   
   .step-info {
       flex: 1;
       padding-top: 0;
   }
  
   .panel-header,
   .guide-header {
       padding: 20px 24px;
       font-size: 1rem;
   }
  
   .qr-placeholder,
   .qr-loading,
   .qr-result {
       min-height: 400px;
       padding: 24px;
   }
   
   /* 컨텐츠 섹션 모바일 최적화 */
   .content-body {
       padding: 24px 20px;
   }
   
   .feature-grid {
       grid-template-columns: 1fr;
       gap: 16px;
   }
   
   .qr-types-grid {
       grid-template-columns: 1fr;
       gap: 16px;
   }
   
   .security-grid {
       grid-template-columns: 1fr;
       gap: 16px;
   }
   

	/* QR코드 미래 기술 섹션 - 모바일 최적화 */
	.trend-item {
		flex-direction: row;
		gap: 16px;
		text-align: left;
		align-items: center;
	}

	.trend-icon {
		width: 44px;
		height: 44px;
		line-height: 44px;
		text-align: center;
	}

	.trend-icon i {
		font-size: 1.25rem;
		vertical-align: middle;
	}
   
   .trend-content {
       flex: 1;
   }
   
   .trend-content h4 {
       font-size: 1.05rem;
       margin-bottom: 6px;
   }
   
   .trend-content p {
       font-size: 0.9rem;
       line-height: 1.5;
   }
   
   /* 푸터 모바일 최적화 */
   .footer-section {
       padding: 40px 0 0;
       margin-top: 30px;
   }
   
   .footer-content {
       gap: 25px;
       padding-bottom: 30px;
   }
   
   .footer-main {
       text-align: center;
       gap: 12px;
   }
   
   .footer-logo {
       justify-content: center;
       font-size: 1.125rem;
   }
   
   .footer-links {
       grid-template-columns: 1fr;
       gap: 20px;
   }
   
   .footer-col {
       text-align: center;
   }
   
   .footer-col h5 {
       text-align: center;
       margin-bottom: 12px;
   }
   
   .footer-col a {
       justify-content: center;
       padding: 4px 0;
   }
   
   .footer-bottom {
       flex-direction: column;
       text-align: center;
       gap: 16px;
       padding: 24px 0;
   }
   
   .footer-copyright {
       order: 2;
       text-align: center;
   }
   
   .footer-social {
       order: 1;
       justify-content: center;
   }
   
   .content-header {
       padding: 20px 24px;
   }
   
   .content-header h2 {
       font-size: 1.125rem;
   }
}

@media (max-width: 576px) {
   .hero-section {
       padding: 30px 0 20px;
   }
   
   .hero-title {
       font-size: 1.375rem;
   }
   
   .hero-title i {
       font-size: 1.5rem;
   }
  
   .main-section {
       padding: 30px 0;
       margin-top: -5px;
   }
  
   .panel-body {
       padding: 20px;
   }
  
   .guide-content {
       padding: 30px 20px;
   }
  
   .ad-container {
       padding: 30px 20px;
   }
  
   .type-card {
       padding: 16px;
       gap: 12px;
   }
  
   .type-icon {
       width: 40px;
       height: 40px;
   }
  
   .type-icon i {
       font-size: 1.25rem;
   }
  
   .step-number {
       width: 36px;
       height: 36px;
       font-size: 1rem;
   }
   
   .step-title {
       font-size: 1rem;
       margin-bottom: 6px;
   }
   
   .step-desc {
       font-size: 0.875rem;
   }
   
   .guide-step {
       gap: 12px;
       padding: 16px 0;
   }
   
   /* 미래 기술 섹션 더 작은 화면 최적화 */
	.trend-item {
		gap: 12px;
		padding: 16px 0;
		align-items: center;
	}

	.trend-icon {
		width: 40px;
		height: 40px;
		line-height: 40px;
		text-align: center;
	}

	.trend-icon i {
		font-size: 1.125rem;
		vertical-align: middle;
	}
   
   .trend-content h4 {
       font-size: 1rem;
   }
   
   .trend-content p {
       font-size: 0.875rem;
   }
   
   /* 푸터 더 작은 화면 최적화 */
   .footer-section {
       padding: 30px 0 0;
   }
   
   .footer-content {
       padding-bottom: 25px;
   }
   
   .footer-logo {
       font-size: 1.075rem;
   }
   
   .footer-logo i {
       font-size: 1.25rem;
   }
   
   .footer-description {
       font-size: 0.9rem;
   }
   
   .footer-col h5 {
       font-size: 0.95rem;
       margin-bottom: 10px;
   }
   
   .footer-col a {
       font-size: 0.875rem;
   }
   
   .footer-bottom {
       padding: 20px 0;
       gap: 12px;
   }
   
   .footer-copyright p {
       font-size: 0.8rem;
   }
   
   .footer-social a {
       width: 32px;
       height: 32px;
   }
   
   .footer-social i {
       font-size: 0.9rem;
   }
}

/* 아주 작은 화면 (360px 이하) 추가 최적화 */
@media (max-width: 360px) {
   .guide-step {
       flex-direction: column;
       text-align: center;
       gap: 8px;
   }
   
   .step-info {
       text-align: center;
   }
   
   .trend-item {
		flex-direction: row;
		text-align: left;
		gap: 10px;
		align-items: center;
	}

	.trend-icon {
		text-align: center;
	}

	.trend-icon i {
		vertical-align: middle;
	}

	.trend-content {
		text-align: left;
	}
   
   .footer-main {
       gap: 10px;
   }
   
   .footer-description {
       font-size: 0.85rem;
   }
}

/* ===================================
* 상태별 숨김 처리
* ===================================
*/
.qr-container.hidden,
.qr-loading.hidden,
.qr-result.hidden {
   display: none !important;
   visibility: hidden !important;
}

/* ===================================
* 접근성 향상
* ===================================
*/
@media (prefers-reduced-motion: reduce) {
   * {
       animation-duration: 0.01ms !important;
       animation-iteration-count: 1 !important;
       transition-duration: 0.01ms !important;
   }
   
   .type-card::before {
       display: none;
   }
}

/* 포커스 가시성 향상 */
.type-card:focus,
.btn-primary:focus,
.btn-secondary:focus,
.btn-download:focus,
.btn-copy:focus {
   outline: 3px solid rgba(102, 126, 234, 0.5);
   outline-offset: 2px;
}

/* 고대비 모드 지원 */
@media (prefers-contrast: high) {
   :root {
       --gray-200: #000000;
       --gray-300: #000000;
       --primary-color: #0000ff;
       --secondary-color: #0000ff;
   }
}

/* 다크모드 지원 (선택사항) */
@media (prefers-color-scheme: dark) {
   :root {
       --white: #1f2937;
       --gray-50: #374151;
       --gray-100: #4b5563;
       --gray-200: #6b7280;
       --gray-800: #f9fafb;
       --gray-700: #e5e7eb;
       --gray-600: #d1d5db;
       --gray-500: #9ca3af;
   }
   
   body {
       background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
   }
}

/* ===================================
* 상태별 숨김 처리
* ===================================
*/
.qr-container.hidden,
.qr-loading.hidden,
.qr-result.hidden {
   display: none !important;
   visibility: hidden !important;
}

/* ===================================
* 접근성 향상
* ===================================
*/
@media (prefers-reduced-motion: reduce) {
   * {
       animation-duration: 0.01ms !important;
       animation-iteration-count: 1 !important;
       transition-duration: 0.01ms !important;
   }
   
   .type-card::before {
       display: none;
   }
}

/* 포커스 가시성 향상 */
.type-card:focus,
.btn-primary:focus,
.btn-secondary:focus,
.btn-download:focus,
.btn-copy:focus {
   outline: 3px solid rgba(102, 126, 234, 0.5);
   outline-offset: 2px;
}

/* 고대비 모드 지원 */
@media (prefers-contrast: high) {
   :root {
       --gray-200: #000000;
       --gray-300: #000000;
       --primary-color: #0000ff;
       --secondary-color: #0000ff;
   }
}

/* 다크모드 지원 (선택사항) */
@media (prefers-color-scheme: dark) {
   :root {
       --white: #1f2937;
       --gray-50: #374151;
       --gray-100: #4b5563;
       --gray-200: #6b7280;
       --gray-800: #f9fafb;
       --gray-700: #e5e7eb;
       --gray-600: #d1d5db;
       --gray-500: #9ca3af;
   }
   
   body {
       background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
   }
}


/* ===================================
 * 컨텐츠 섹션 스타일
 * ===================================
 */
.content-section {
    padding: 60px 0;
    background: var(--white);
}

.content-panel {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.content-header {
    background: linear-gradient(135deg, var(--gray-700) 0%, var(--gray-800) 100%);
    color: var(--white);
    padding: 24px 30px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.content-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
}

.content-body {
    padding: 40px 30px;
}

/* 요약 박스 */
.summary-box {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 32px;
}

.summary-box h3 {
    color: var(--primary-color);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.summary-box p {
    margin: 0;
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--gray-700);
}

/* 특징 그리드 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.feature-item {
    text-align: center;
    padding: 24px;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.feature-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.feature-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.feature-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin: 0;
}

/* 활용 사례 섹션 */
.use-case-section {
    margin-bottom: 32px;
}

.use-case-section h3 {
    color: var(--gray-800);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
}

.custom-list {
    list-style: none;
    padding: 0;
}

.custom-list li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    line-height: 1.6;
}

.custom-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.custom-list strong {
    color: var(--gray-800);
}

/* QR 타입 그리드 */
.qr-types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.qr-type-card {
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}

.qr-type-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.type-icon-large {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    border-radius: 50%;
    margin-bottom: 16px;
}

.type-icon-large i {
    font-size: 1.75rem;
}

.qr-type-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 12px;
}

.qr-type-card p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 16px;
}

.type-examples {
    background: var(--gray-50);
    padding: 12px;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    text-align: left;
}

.type-examples strong {
    color: var(--gray-800);
}

/* 팁 섹션 */
.tips-section {
    margin-bottom: 32px;
}

.tips-section h3 {
    color: var(--gray-800);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--success-color);
}

.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-100);
}

.tip-item:last-child {
    border-bottom: none;
}

.tip-item i {
    font-size: 1.25rem;
    margin-top: 2px;
}

.tip-content {
    flex: 1;
    line-height: 1.6;
}

.tip-content strong {
    color: var(--gray-800);
}

/* FAQ 섹션 */
.faq-section {
    margin-top: 24px;
}

.faq-item {
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question {
    background: var(--gray-50);
    padding: 20px;
    margin: 0;
}

.faq-question h3 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--gray-800);
}

.faq-answer {
    padding: 20px;
    background: var(--white);
}

.faq-answer p {
    margin: 0;
    line-height: 1.6;
    color: var(--gray-700);
}

/* 보안 그리드 */
.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin: 24px 0;
}

.security-card {
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
}

.security-card.danger {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.05) 0%, rgba(239, 68, 68, 0.1) 100%);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.security-card.safe {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(16, 185, 129, 0.1) 100%);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.security-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-bottom: 16px;
}

.security-card.danger .security-icon {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.security-card.safe .security-icon {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.security-icon i {
    font-size: 1.5rem;
}

.security-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.security-card.danger h4 {
    color: var(--danger-color);
}

.security-card.safe h4 {
    color: var(--success-color);
}

.security-card ul {
    list-style: none;
    padding: 0;
    text-align: left;
}

.security-card li {
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.95rem;
}

.security-card.danger li::before {
    content: '⚠';
    position: absolute;
    left: 0;
    color: var(--danger-color);
}

.security-card.safe li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
}

/* 보안 팁 */
.security-tips {
    margin-top: 32px;
}

.security-tips h3 {
    color: var(--gray-800);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--warning-color);
}

/* ===================================
 * 미래 트렌드
 * ===================================
 */
.future-trends {
    margin: 24px 0;
}

.trend-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid var(--gray-200);
}

.trend-item:last-child {
    border-bottom: none;
}

.trend-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    border-radius: var(--border-radius);
    flex-shrink: 0;
    text-align: center;
    line-height: 50px;
}

.trend-icon i {
    font-size: 1.5rem;
    vertical-align: middle;
}

.trend-icon i::before {
    vertical-align: middle !important;
}

.trend-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.trend-content p {
    margin: 0;
    line-height: 1.6;
    color: var(--gray-600);
}




/* 결론 섹션 */
.conclusion-section {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 2px solid var(--gray-200);
}

.conclusion-section h3 {
    color: var(--gray-800);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.next-steps {
    background: var(--gray-50);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-top: 24px;
}

.next-steps h4 {
    color: var(--primary-color);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.next-steps ul {
    margin: 0;
    padding-left: 20px;
}

.next-steps li {
    padding: 4px 0;
    line-height: 1.6;
    color: var(--gray-700);
}

/* 반응형 조정 */
@media (max-width: 768px) {
    .content-body {
        padding: 24px 20px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .qr-types-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .security-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .trend-item {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .content-header {
        padding: 20px 24px;
    }
    
    .content-header h2 {
        font-size: 1.125rem;
    }
}


/* ===================================
 * 푸터 섹션
 * ===================================
 */
.footer-section {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    color: var(--gray-300);
    padding: 50px 0 0;
    margin-top: 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--gray-700);
}

.footer-main {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.footer-logo i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.footer-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--gray-400);
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-col h5 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
}

.footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-col li {
    margin-bottom: 8px;
}

.footer-col a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.footer-col a:hover {
    color: var(--primary-color);
    padding-left: 4px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    flex: 1;
}

.footer-copyright p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--gray-500);
    line-height: 1.4;
}

.footer-copyright p:first-child {
    margin-bottom: 4px;
}

.footer-copyright a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

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

.footer-social {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-social span {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-right: 4px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--gray-700);
    color: var(--gray-400);
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.footer-social i {
    font-size: 1rem;
}

/* 푸터 반응형 디자인 */
@media (max-width: 992px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
}

@media (max-width: 768px) {
    .footer-section {
        padding: 40px 0 0;
        margin-top: 30px;
    }
    
    .footer-content {
        gap: 25px;
        padding-bottom: 30px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }
    
    .footer-copyright {
        order: 2;
    }
    
    .footer-social {
        order: 1;
    }
}

@media (max-width: 576px) {
    .footer-section {
        padding: 30px 0 0;
    }
    
    .footer-content {
        padding-bottom: 25px;
    }
    
    .footer-bottom {
        padding: 20px 0;
    }
    
    .footer-logo {
        font-size: 1.125rem;
    }
    
    .footer-logo i {
        font-size: 1.25rem;
    }
    
    .footer-social a {
        width: 32px;
        height: 32px;
    }
    
    .footer-social i {
        font-size: 0.9rem;
    }
}

/* 바디 하단 여백 제거 */
body {
    margin-bottom: 0 !important;
    padding-bottom: 0 !important;
}