/* Lift Innovations - Main Styles */

:root {
    /* 색상 변수 */
    --primary-blue: #0066cc;
    --primary-blue-dark: #004499;
    --secondary-purple: #667eea;
    --secondary-purple-dark: #764ba2;
    --accent-orange: #ff6b6b;
    --accent-orange-dark: #ee5a24;
    
    /* 그레이 톤 */
    --gray-900: #1a1a1a;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    
    /* 배경색 */
    --bg-light: #f8fafc;
    --bg-lighter: #ffffff;
    
    /* 폰트 */
    --font-primary: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    
    /* 간격 */
    --container-max-width: 1200px;
    --section-padding: 100px;
    --section-padding-mobile: 60px;
    
    /* 그림자 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
    
    /* 전환 효과 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 기본 리셋 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-900);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 컨테이너 */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.download-btn {
    display: inline-block;
    background: linear-gradient(45deg, #000, #333);
    color: white;
    text-decoration: none;
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* 언어 선택기 */
.language-selector {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 999;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    padding: 8px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.language-selector a {
    display: inline-block;
    padding: 8px 16px;
    margin: 0 2px;
    text-decoration: none;
    color: var(--gray-600);
    border-radius: 8px;
    transition: all var(--transition-normal);
    font-weight: 500;
    font-size: 0.9rem;
}

.language-selector a.active {
    background: var(--primary-blue);
    color: white;
    box-shadow: var(--shadow-sm);
}

.language-selector a:hover:not(.active) {
    background: var(--gray-100);
    color: var(--primary-blue);
}

/* 헤더 */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: all var(--transition-normal);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--gray-900);
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: translateY(-1px);
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    position: relative;
    transition: color var(--transition-normal);
    padding: 8px 0;
}

.nav-links a:hover {
    color: var(--primary-blue);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width var(--transition-normal);
}

.nav-links a:hover::after {
    width: 100%;
}

/* 버튼 스타일 */
.btn {
    display: inline-block;
    padding: 14px 28px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    font-family: inherit;
    line-height: 1.2;
    position: relative;
    overflow: hidden;
}

.btn:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
    color: white;
    box-shadow: 0 8px 25px rgba(0, 102, 204, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(0, 102, 204, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-2px);
}

/* CTA 버튼 그룹 */
.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 32px;
}

/* 섹션 공통 */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section:nth-child(even) {
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--gray-900), var(--primary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 그리드 레이아웃 */
.grid {
    display: grid;
    gap: 32px;
}

.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));
}

/* 카드 스타일 */
.card {
    background: white;
    border-radius: 20px;
    padding: 40px 32px;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 24px;
    display: block;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.card-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* 연락처 그리드 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.contact-item {
    padding: 32px 24px;
    transition: transform var(--transition-normal);
}

.contact-item:hover {
    transform: translateY(-4px);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.contact-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.contact-info {
    color: var(--gray-600);
}

.contact-info a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-normal);
}

.contact-info a:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

/* 푸터 */
footer {
    background: var(--gray-900);
    color: white;
    padding: 60px 0 40px;
}

.footer-content {
    text-align: center;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary-blue), #00aaff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    font-size: 1.1rem;
    margin-bottom: 32px;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.7;
    transition: opacity var(--transition-normal);
    font-weight: 500;
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 32px;
    text-align: center;
    opacity: 0.7;
}

.business-info {
    margin-top: 12px;
    font-size: 0.9rem;
    opacity: 0.6;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    .language-selector {
        top: 70px;
        right: 15px;
        padding: 6px;
    }
    
    .nav-links {
        gap: 24px;
    }
    
    .section {
        padding: 80px 0;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .language-selector {
        top: 60px;
        right: 10px;
        padding: 4px;
    }
    
    .language-selector a {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
    
    .section {
        padding: var(--section-padding-mobile) 0;
    }
    
    .section-header {
        margin-bottom: 50px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .section {
        padding: 50px 0;
    }
    
    .card {
        padding: 32px 24px;
    }
    
    .contact-item {
        padding: 24px 16px;
    }
}

/* 유틸리티 클래스 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 40px; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 40px; }

.hidden { display: none; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }