/* CSS 변수 정의 */
:root {
    /* 색상 팔레트 */
    --primary-color: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --secondary-color: #1f2937;
    --accent-color: #059669;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    --gradient-hero: linear-gradient(135deg, rgba(37, 99, 235, 0.9) 0%, rgba(59, 130, 246, 0.8) 100%);
    
    /* 전환 효과 */
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 헤더 */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 10px 0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.2rem;
}

.logo h1 a {
    text-decoration: none;
    color: inherit;
}

.logo p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* 모바일 메뉴 토글 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

/* 네비게이션 메뉴 */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav-item a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 0;
    transition: var(--transition);
    position: relative;
}

.nav-item a:hover,
.nav-item.active a {
    color: var(--primary-color);
}

.nav-item.active a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

/* 헤더 액션 영역 */
.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* 상담 신청 버튼 */
.btn-consultation {
    background: var(--primary-color);
    color: var(--bg-primary);
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-consultation:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* 모바일 연락처 */
.mobile-contact {
    display: none;
    gap: 8px;
}

.mobile-contact a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--bg-primary);
    text-decoration: none;
    border-radius: 50%;
    font-size: 1.2rem;
    transition: var(--transition);
}

.mobile-contact a svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.mobile-contact a:hover {
    background: var(--primary-dark);
}

/* 메인 컨텐츠 */
.main {
    min-height: calc(100vh - 200px);
}

/* 섹션 공통 스타일 */
.section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    margin: 0.5rem auto 0;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 히어로 섹션 */
.hero {
    background: var(--gradient-hero);
    color: var(--bg-primary);
    text-align: center;
    padding: 6rem 0;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 버튼 스타일 */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--bg-primary);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--bg-primary);
}

/* 카드 스타일 */
.card {
    background: var(--bg-primary);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.card-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.card-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.card-link:hover {
    gap: 0.8rem;
}

/* 그리드 레이아웃 */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* 서비스 프리뷰 */
.services-preview {
    background: var(--bg-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* 회계사무소 소개 프리뷰 */
.about-preview {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.about-text p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 고객 후기 */
.testimonials {
    background: var(--bg-primary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
}

.testimonial-rating {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.testimonial-content {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.testimonial-author strong {
    color: var(--text-primary);
}

.testimonial-author span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 연락처 정보 */
.contact-info {
    background: var(--bg-primary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.contact-item {
    text-align: center;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-3px);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.contact-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.contact-details {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.contact-details a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-details a:hover {
    text-decoration: underline;
}

/* 푸터 */
.footer {
    background: var(--secondary-color);
    color: var(--bg-primary);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-info h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--bg-primary);
}

.footer-info p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.footer-info a {
    color: var(--bg-primary);
    text-decoration: none;
}

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

.footer-services h4,
.footer-hours h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--bg-primary);
}

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

.footer-services li {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
}

.footer-services li::before {
    content: '•';
    color: var(--primary-color);
    margin-right: 0.5rem;
}

.footer-hours p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1rem;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* 에러 페이지 */
.error-page {
    text-align: center;
    padding: 4rem 0;
    background: var(--bg-primary);
}

.error-code {
    font-size: 6rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.error-message {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .logo p {
        font-size: 0.8rem;
    }
    
    .mobile-contact {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .btn-consultation {
        display: none;
    }
    
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
    }
    
    .nav-item a {
        display: block;
        padding: 1rem 2rem;
        border-radius: 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-item:last-child a {
        border-bottom: none;
    }
    
    .nav-item.active a::after {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .section {
        padding: 2rem 0;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* 접근성 개선 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 포커스 스타일 */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 선택 스타일 */
::selection {
    background: rgba(37, 99, 235, 0.2);
    color: var(--text-primary);
}