/* ===================================
   S-CHEM Premium B2B Corporate Styles
   High-End Global Chemical Company Design
   =================================== */

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Page transition animations */
section {
    animation: fadeIn 0.5s ease-in-out;
}

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

:root {
    /* Brand Colors (Logo-derived) */
    --primary-blue: #0A4FA3;
    --accent-green: #5FAE45;
    --dark-blue: #083d82;
    --light-green: #6DBB4A;
    
    /* Neutral Palette */
    --text-dark: #1a202c;
    --text-medium: #2d3748;
    --text-gray: #4a5568;
    --text-light: #718096;
    --text-lighter: #a0aec0;
    
    /* Backgrounds */
    --bg-white: #ffffff;
    --bg-light: #f7fafc;
    --bg-gray: #edf2f7;
    --bg-dark: #2d3748;
    
    /* Borders & Shadows */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e0;
    --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 10px 30px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.2);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    
    /* Typography */
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    font-family: var(--font-body);
    color: var(--text-medium);
    line-height: 1.7;
    background-color: var(--bg-white);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container System */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-fluid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-large {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--dark-blue);
}

/* ===================================
   HEADER & NAVIGATION
   =================================== */

.header {
    background: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
    border-bottom: 1px solid #f0f0f0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.25rem 0;
    position: relative;
    min-height: 60px;
}

.logo {
    display: flex;
    align-items: center;
}

/* Header Logo Image Styles - Transparent Version with Subtitle */
.logo-img {
    height: 220px;
    width: auto;
    display: block;
    object-fit: contain;
    transition: transform 0.3s ease;
    margin: -60px 0;
    /* 투명 배경 로고용 설정 */
    background: transparent;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.08));
}

.logo-img:hover {
    transform: scale(1.05);
}

.nav {
    display: flex;
    gap: 2.5rem;
    align-items: center;
    flex-wrap: nowrap;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-link {
    color: #666666;
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: 0;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
    white-space: nowrap;
    text-decoration: none;
}

.nav-link::after {
    display: none;
}

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

.nav-link.active {
    color: var(--primary-blue);
    font-weight: 600;
}

.lang-toggle {
    background: #1e6bb8;
    color: white;
    border: none;
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.lang-toggle:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mobile-lang {
    display: none;
}

.desktop-lang {
    display: block;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1000;
}

.mobile-menu-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
    display: block;
    opacity: 1;
}

/* ===================================
   HERO SECTION - PREMIUM
   =================================== */

.hero-premium {
    position: relative;
    background: 
        linear-gradient(135deg, rgba(10,79,163,0.85) 0%, rgba(95,174,69,0.85) 100%),
        url('../images/hero-background.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: white;
    padding: 8rem 0 6rem;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(135deg, rgba(10,79,163,0.75) 0%, rgba(95,174,69,0.75) 100%),
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect fill="rgba(255,255,255,0.02)" width="100" height="100"/><circle cx="50" cy="50" r="30" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></svg>');
    background-size: 100%, 100px 100px;
    backdrop-filter: blur(2px);
    z-index: 1;
}

.hero-content-premium {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
}

.hero-title-premium {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.hero-subtitle-premium {
    font-size: 1.25rem;
    line-height: 1.8;
    opacity: 0.95;
    margin-bottom: 3rem;
    font-weight: 400;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    font-family: var(--font-heading);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    font-weight: 500;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary-premium {
    background: white;
    color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
}

.btn-primary-premium:hover {
    background: var(--bg-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary-premium {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary-premium:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-3px);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 2;
}

.hero-scroll-indicator span {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.scroll-arrow {
    width: 24px;
    height: 36px;
    border: 2px solid white;
    border-radius: 12px;
    position: relative;
    margin: 0 auto;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: white;
    border-radius: 2px;
    animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
    0%, 100% { top: 8px; opacity: 1; }
    50% { top: 16px; opacity: 0.5; }
}

/* ===================================
   TRUSTED BRANDS SECTION
   =================================== */

.trusted-brands {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-light);
}

.brands-category {
    margin-bottom: 4rem;
}

.brands-category:last-child {
    margin-bottom: 0;
}

.brands-category-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid var(--primary-blue);
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.brand-card {
    background: white;
    padding: 2rem 1.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.brand-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.brand-card:hover::before {
    transform: scaleX(1);
}

.brand-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    font-family: var(--font-heading);
}

.brand-name-large {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    font-family: var(--font-heading);
}

.brand-type {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===================================
   SECTION STYLES - PREMIUM
   =================================== */

.section {
    padding: var(--spacing-2xl) 0;
}

.section-premium {
    padding: 6rem 0;
}

.section-alt {
    background: var(--bg-light);
}

.section-header-premium {
    max-width: 900px;
    margin: 0 auto 4rem;
}

.section-header-premium.text-center {
    text-align: center;
}

.section-badge {
    display: inline-block;
    background: var(--bg-light);
    color: var(--primary-blue);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-medium);
}

.section-title-premium {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.section-title-premium.text-white {
    color: white;
}

.section-intro-premium {
    font-size: 1.125rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 0;
}

.section-intro-premium.text-white {
    color: rgba(255,255,255,0.9);
}

.subsection-title-premium {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 4rem 0 2rem;
}

/* ===================================
   CEO MESSAGE - PREMIUM
   =================================== */

.ceo-message-premium {
    max-width: 1000px;
    margin: 3rem auto;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 0;
}

.ceo-photo-container {
    position: relative;
    background: linear-gradient(135deg, rgba(10,79,163,0.1) 0%, rgba(95,174,69,0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    overflow: hidden;
}

.ceo-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    position: relative;
    z-index: 2;
    transition: transform 0.3s ease;
}

.ceo-photo:hover {
    transform: scale(1.05);
}

.ceo-photo-decoration {
    display: none;
}

.ceo-content {
    padding: 4rem;
    position: relative;
}

.quote-mark {
    position: absolute;
    top: 2rem;
    left: 2rem;
    font-size: 6rem;
    font-family: Georgia, serif;
    color: var(--accent-green);
    opacity: 0.15;
    line-height: 1;
}

.ceo-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.ceo-text {
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--text-gray);
    font-style: italic;
    margin-bottom: 2.5rem;
    position: relative;
    z-index: 1;
}

.ceo-signature-premium {
    border-top: 2px solid var(--border-light);
    padding-top: 1.5rem;
    position: relative;
    z-index: 1;
}

.signature-line {
    width: 200px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
    margin-bottom: 1rem;
}

.signature-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.signature-title {
    font-size: 0.95rem;
    color: var(--text-light);
    font-weight: 500;
}

/* ===================================
   CORE VALUES - PREMIUM
   =================================== */

.core-values-premium {
    margin: 4rem 0;
}

.values-grid-premium {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    margin-top: 2.5rem;
}

.value-card-premium {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--accent-green);
    transition: all 0.3s ease;
}

.value-card-premium:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--primary-blue);
}

.value-icon-premium {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: white;
}

.value-icon-premium svg {
    width: 32px;
    height: 32px;
}

.value-card-premium h4 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.value-card-premium p {
    font-size: 1rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ===================================
   COMPANY HISTORY TIMELINE - PREMIUM
   =================================== */

.history-section-premium {
    margin: 4rem 0;
}

.timeline-premium {
    max-width: 900px;
    margin: 3rem auto;
    position: relative;
}

.timeline-premium::before {
    content: '';
    position: absolute;
    left: 120px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-blue), var(--accent-green));
}

.timeline-item-premium {
    display: flex;
    gap: 3rem;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-year-premium {
    flex: 0 0 100px;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-blue);
    font-family: var(--font-heading);
    text-align: right;
    padding-top: 0.5rem;
}

.timeline-content-premium {
    flex: 1;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--accent-green);
    position: relative;
}

.timeline-content-premium::before {
    content: '';
    position: absolute;
    left: -23px;
    top: 2rem;
    width: 16px;
    height: 16px;
    background: var(--accent-green);
    border: 4px solid white;
    border-radius: 50%;
    box-shadow: 0 0 0 3px var(--border-light);
}

.timeline-content-premium h4 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.timeline-content-premium p {
    font-size: 1rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ===================================
   TECHNOLOGY SECTION - PREMIUM
   =================================== */

.section-tech-premium {
    background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    position: relative;
    overflow: hidden;
}

.tech-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect fill="rgba(10,79,163,0.03)" width="100" height="100"/><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(95,174,69,0.05)" stroke-width="1"/></svg>');
    background-size: 100px 100px;
    opacity: 0.5;
}

.tech-grid-premium {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    margin-top: 3rem;
    position: relative;
    z-index: 1;
}

.tech-card-premium {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-xl);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-height: 450px;
}

.tech-card-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 180px;
    background-size: cover;
    background-position: center;
    opacity: 0.15;
    transition: all 0.3s ease;
}

.tech-card-premium::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
}

.tech-card-premium:nth-child(1)::before {
    background-image: url('../images/tech-surface.jpg');
}

.tech-card-premium:nth-child(2)::before {
    background-image: url('../images/tech-coating.jpg');
}

.tech-card-premium:nth-child(3)::before {
    background-image: url('../images/tech-anti-squeak.jpg');
}

.tech-card-premium:nth-child(4)::before {
    background-image: url('../images/tech-water-based.jpg');
}

.tech-card-premium:nth-child(5)::before {
    background-image: url('../images/tech-pu.jpg');
}

.tech-card-premium:nth-child(6)::before {
    background-image: url('../images/tech-functional.jpg');
}

.tech-card-premium:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(10,79,163,0.2);
}

.tech-card-premium:hover::before {
    opacity: 0.25;
    height: 200px;
}

.tech-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 2;
}

.tech-icon-premium {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.tech-icon-premium svg {
    width: 32px;
    height: 32px;
}

.tech-badge-corner {
    background: var(--accent-green);
    color: white;
    padding: 0.375rem 0.875rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tech-card-premium h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
}

.tech-card-premium p {
    font-size: 1rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 2;
}

.tech-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    position: relative;
    z-index: 2;
}

.tech-spec-item {
    background: var(--bg-light);
    color: var(--primary-blue);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--border-medium);
}

/* ===================================
   PRODUCTS SECTION - PREMIUM
   =================================== */

.section-products-premium {
    padding: 6rem 0;
    background: var(--bg-white);
}

.product-category-premium {
    margin-bottom: 5rem;
    padding-bottom: 4rem;
    border-bottom: 2px solid var(--border-light);
}

.product-category-premium:last-child {
    border-bottom: none;
}

.product-category-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 3rem;
}

.product-number-large {
    font-size: 6rem;
    font-weight: 900;
    color: var(--primary-blue);
    opacity: 0.1;
    font-family: var(--font-heading);
    line-height: 1;
}

.product-category-info {
    flex: 1;
}

.product-category-title-premium {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.product-category-title-premium::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 120px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
}

.product-category-desc {
    font-size: 1.125rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 0;
}

.product-features-premium {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card-premium {
    background: white;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card-premium::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 120px;
    height: 120px;
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    border-radius: 0 12px 0 50%;
    transition: all 0.3s ease;
}

/* Textile & Leather Products */
.product-category-premium:nth-child(2) .feature-card-premium:nth-child(1)::before {
    background-image: url('../images/product-textile-1.jpg');
}

.product-category-premium:nth-child(2) .feature-card-premium:nth-child(2)::before {
    background-image: url('../images/product-textile-2.jpg');
}

.product-category-premium:nth-child(2) .feature-card-premium:nth-child(3)::before {
    background-image: url('../images/product-textile-3.jpg');
}

/* Automotive Products */
.product-category-premium:nth-child(3) .feature-card-premium:nth-child(1)::before {
    background-image: url('../images/product-automotive-1.jpg');
}

.product-category-premium:nth-child(3) .feature-card-premium:nth-child(2)::before {
    background-image: url('../images/product-automotive-2.jpg');
}

.product-category-premium:nth-child(3) .feature-card-premium:nth-child(3)::before {
    background-image: url('../images/product-automotive-3.jpg');
}

/* Footwear Products */
.product-category-premium:nth-child(4) .feature-card-premium:nth-child(1)::before {
    background-image: url('../images/product-footwear-1.jpg');
}

.product-category-premium:nth-child(4) .feature-card-premium:nth-child(2)::before {
    background-image: url('../images/product-footwear-2.jpg');
}

.product-category-premium:nth-child(4) .feature-card-premium:nth-child(3)::before {
    background-image: url('../images/product-footwear-3.jpg');
}

/* Specialty Products */
.product-category-premium:nth-child(5) .feature-card-premium:nth-child(1)::before {
    background-image: url('../images/product-specialty-1.jpg');
}

.product-category-premium:nth-child(5) .feature-card-premium:nth-child(2)::before {
    background-image: url('../images/product-specialty-2.jpg');
}

.product-category-premium:nth-child(5) .feature-card-premium:nth-child(3)::before {
    background-image: url('../images/product-specialty-3.jpg');
}

.feature-card-premium:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-card-premium:hover::before {
    opacity: 0.15;
    width: 140px;
    height: 140px;
}

.product-code {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    color: white;
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.5px;
    margin-bottom: 1.25rem;
}

.feature-card-premium h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.feature-card-premium p {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.feature-applications {
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.feature-applications strong {
    display: block;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.feature-applications span {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--text-gray);
    margin-right: 0.5rem;
}

.feature-applications span::after {
    content: '•';
    margin-left: 0.5rem;
    color: var(--text-lighter);
}

.feature-applications span:last-child::after {
    display: none;
}

.feature-tech-specs {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
}

.spec-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.spec-label {
    color: var(--text-light);
    font-weight: 500;
}

.spec-value {
    color: var(--text-dark);
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

/* ===================================
   APPLICATIONS SECTION - PREMIUM
   =================================== */

.section-applications-premium {
    padding: 6rem 0;
    background: var(--bg-light);
}

.applications-grid-premium {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.application-card-premium {
    background: white;
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-height: 350px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.application-card-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.12;
    z-index: 0;
    transition: all 0.3s ease;
}

/* Application Background Images */
.application-card-premium:nth-child(1)::before {
    background-image: url('../images/app-automotive.jpg');
}

.application-card-premium:nth-child(2)::before {
    background-image: url('../images/app-luxury-fashion.jpg');
}

.application-card-premium:nth-child(3)::before {
    background-image: url('../images/app-performance-footwear.jpg');
}

.application-card-premium:nth-child(4)::before {
    background-image: url('../images/app-technical-textiles.jpg');
}

.application-card-premium:nth-child(5)::before {
    background-image: url('../images/app-film-packaging.jpg');
}

.application-card-premium:nth-child(6)::before {
    background-image: url('../images/app-industrial.jpg');
}

.application-card-premium * {
    position: relative;
    z-index: 1;
}

.application-card-premium:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.application-card-premium:hover::before {
    opacity: 0.18;
}

.application-icon-premium {
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.application-icon-premium svg {
    width: 40px;
    height: 40px;
}

.application-card-premium h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
}

.application-card-premium p {
    font-size: 1rem;
    color: rgba(255,255,255,0.95);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.application-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.application-tags span {
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    color: white;
    padding: 0.375rem 0.875rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(255,255,255,0.3);
}

/* ===================================
   PARTNERS SECTION - PREMIUM
   =================================== */

.section-partners-premium {
    padding: 6rem 0;
    background: var(--bg-white);
}

.partner-category-section {
    margin-bottom: 5rem;
}

.partner-category-section:last-child {
    margin-bottom: 0;
}

.partner-category-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    border-left: 5px solid var(--primary-blue);
}

.partner-category-desc {
    font-size: 1.125rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
    padding-left: 1.5rem;
}

.partners-grid-premium {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.applied-brands-grid {
    grid-template-columns: repeat(4, 1fr);
}

.partner-card-premium {
    background: white;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
}

.partner-card-premium:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.partner-card-premium.brand-card {
    background: linear-gradient(135deg, #f7fafc 0%, #ffffff 100%);
    min-height: 140px;
}

.partner-placeholder-premium {
    font-size: 0.95rem;
    color: var(--text-gray);
    text-align: center;
    line-height: 1.5;
    font-weight: 500;
}

.partner-category-tag {
    background: var(--bg-light);
    color: var(--primary-blue);
    padding: 0.375rem 0.875rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid var(--border-medium);
}

/* ===================================
   NETWORK SECTION - PREMIUM (UPGRADED v3.0)
   Professional B2B Design with Images & Rich Content
   =================================== */

.section-network-premium {
    padding: 6rem 0;
    background: linear-gradient(180deg, #0a1929 0%, #1a2332 100%);
    position: relative;
    overflow: hidden;
}

.network-background-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../images/network-background.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    z-index: 0;
}

.section-network-premium .container {
    position: relative;
    z-index: 1;
}

.section-network-premium .section-badge {
    background: rgba(95,174,69,0.2);
    color: var(--accent-green);
    border: 1px solid rgba(95,174,69,0.3);
}

.section-network-premium .section-title-premium {
    color: white;
}

.section-network-premium .section-intro-premium {
    color: rgba(255,255,255,0.8);
}

/* Network Stats Grid */
.network-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin: 3rem 0;
}

.network-stat-card {
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.network-stat-card:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--accent-green);
    transform: translateY(-5px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.stat-icon svg {
    width: 32px;
    height: 32px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: white;
    margin-bottom: 0.5rem;
    font-family: var(--font-heading);
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.7);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.network-diagram-premium {
    background: rgba(255,255,255,0.98);
    padding: 4rem 3rem;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    margin: 3rem auto;
    max-width: 1100px;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.2);
}

.network-diagram-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
}

.network-diagram-premium svg {
    width: 100%;
    height: auto;
    display: block;
    position: relative;
    z-index: 1;
}

/* Network connection lines animation */
.network-connection {
    animation: pulseConnection 3s ease-in-out infinite;
}

@keyframes pulseConnection {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Network hub (center) */
.network-hub {
    transition: all 0.4s ease;
}

.network-hub:hover {
    filter: url(#shadow-premium) brightness(1.05);
    transform: scale(1.02);
}

/* Network nodes */
.network-node-premium {
    cursor: pointer;
    transition: all 0.3s ease;
}

.network-node-premium:hover {
    stroke: var(--accent-green);
    stroke-width: 4;
    filter: url(#node-shadow);
    transform: translateY(-2px);
}

.network-description-premium {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
    margin-top: 4rem;
}

.network-desc-card {
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.4s ease;
    position: relative;
}

.network-desc-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10,79,163,0.1), rgba(95,174,69,0.1));
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.network-desc-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-green);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.network-desc-card:hover::before {
    opacity: 1;
}

.desc-card-image {
    width: 100%;
    height: 220px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.desc-card-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(10,79,163,0.8) 100%);
}

.desc-card-content {
    padding: 2.5rem;
    position: relative;
    z-index: 1;
}

.desc-card-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(10,79,163,0.3);
}

.desc-card-icon svg {
    width: 28px;
    height: 28px;
}

.network-desc-card h4 {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
    position: relative;
}

.network-desc-card p {
    font-size: 1rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.desc-card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.feature-tag {
    background: rgba(95,174,69,0.15);
    color: var(--accent-green);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid rgba(95,174,69,0.3);
    transition: all 0.3s ease;
}

.feature-tag:hover {
    background: var(--accent-green);
    color: white;
    transform: translateY(-2px);
}

/* ===================================
   CONTACT SECTION - PREMIUM
   =================================== */

.section-contact-premium {
    padding: 6rem 0;
    background: var(--bg-white);
    position: relative;
}

.section-contact-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../images/contact-factory.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.04;
    z-index: 0;
}

.section-contact-premium > * {
    position: relative;
    z-index: 1;
}

.contact-layout-premium {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    margin-top: 3rem;
}

.contact-section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 2rem;
}

.contact-info-item-premium {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.contact-icon-premium {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.contact-icon-premium svg {
    width: 28px;
    height: 28px;
}

.contact-info-content h4 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.contact-info-content p {
    font-size: 1rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 0.5rem;
}

.contact-link {
    color: var(--primary-blue);
    font-weight: 600;
    transition: color 0.3s ease;
}

.contact-link:hover {
    color: var(--dark-blue);
}

.contact-address-en {
    margin-bottom: 0.75rem;
}

.contact-address-ko {
    font-size: 0.95rem;
    color: var(--text-light);
}

.contact-map-premium {
    margin-top: 2rem;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.form-premium {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-light);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group-premium {
    margin-bottom: 1.5rem;
}

.form-group-premium label {
    display: block;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-group-premium input,
.form-group-premium select,
.form-group-premium textarea {
    width: 100%;
    padding: 0.875rem 1.125rem;
    border: 2px solid var(--border-light);
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.form-group-premium input:focus,
.form-group-premium select:focus,
.form-group-premium textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(10,79,163,0.1);
}

.form-group-premium textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-submit-premium {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    color: white;
    border: none;
    padding: 1.125rem 2rem;
    border-radius: 8px;
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.btn-submit-premium:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-submit-premium svg {
    width: 20px;
    height: 20px;
}

.form-note-premium {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 1rem;
    margin-bottom: 0;
}

/* ===================================
   FOOTER - PREMIUM
   =================================== */

.footer-premium {
    background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content-premium {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: white;
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

/* Footer Logo - Image Version */
.footer-logo {
    height: 100px;
    width: auto;
    margin-bottom: 1.5rem;
    /* 투명 로고를 흰색으로 변환 */
    filter: brightness(0) invert(1) drop-shadow(0 2px 8px rgba(255, 255, 255, 0.2));
    transition: transform 0.3s ease;
}

.footer-logo:hover {
    transform: scale(1.05);
    filter: brightness(0) invert(1) drop-shadow(0 4px 12px rgba(255, 255, 255, 0.4));
}

.footer-tagline {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.footer-desc {
    font-size: 0.95rem;
    line-height: 1.7;
    opacity: 0.8;
    margin-bottom: 0;
}

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

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a,
.footer-links li {
    color: rgba(255,255,255,0.8);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

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

.footer-contact li {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    opacity: 0.8;
}

.footer-contact a {
    color: rgba(255,255,255,0.8);
    transition: color 0.3s ease;
}

.footer-contact a:hover {
    color: white;
}

.footer-bottom-premium {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom-premium p {
    font-size: 0.875rem;
    opacity: 0.7;
    margin-bottom: 0;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 1200px) {
    .values-grid-premium,
    .tech-grid-premium,
    .product-features-premium,
    .applications-grid-premium {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid-premium,
    .applied-brands-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 992px) {
    .nav {
        position: fixed;
        top: 70px;
        right: -100%;
        left: auto;
        width: 80%;
        max-width: 320px;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: 2rem;
        transition: right 0.3s ease;
        box-shadow: -2px 0 10px rgba(0,0,0,0.1);
        overflow-y: auto;
        z-index: 999;
    }
    
    .nav.active {
        right: 0;
    }
    
    .nav-link {
        padding: 1rem 0;
        border-bottom: 1px solid #eee;
        font-size: 1.1rem;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .mobile-lang {
        display: block;
        margin-top: 1.5rem;
        width: 100%;
        padding: 0.75rem;
        font-size: 1rem;
    }
    
    .desktop-lang {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title-premium {
        font-size: 2.5rem;
    }
    
    /* CEO Section Mobile */
    .ceo-message-premium {
        grid-template-columns: 1fr;
    }
    
    .ceo-photo-container {
        padding: 0;
        min-height: 400px;
    }
    
    .ceo-photo {
        object-fit: cover;
    }
    
    .ceo-content {
        padding: 3rem 2rem;
    }
    
    .hero-stats {
        gap: 2rem;
    }
    
    .contact-layout-premium {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-content-premium {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .network-description-premium {
        grid-template-columns: 1fr;
    }
    
    .network-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .network-diagram-premium {
        padding: 2.5rem 2rem;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
    
    .section-premium {
        padding: 4rem 0;
    }
    
    .hero-premium {
        padding: 6rem 0 4rem;
    }
    
    .hero-title-premium {
        font-size: 2rem;
    }
    
    .hero-subtitle-premium {
        font-size: 1.125rem;
    }
    
    .section-title-premium {
        font-size: 2rem;
    }
    
    .values-grid-premium,
    .tech-grid-premium,
    .product-features-premium,
    .applications-grid-premium,
    .partners-grid-premium,
    .applied-brands-grid,
    .network-stats-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-premium::before {
        left: 20px;
    }
    
    .timeline-item-premium {
        flex-direction: column;
        padding-left: 50px;
    }
    
    .timeline-year-premium {
        text-align: left;
        padding-top: 0;
    }
    
    .timeline-content-premium::before {
        left: -48px;
    }
    
    .product-category-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .product-number-large {
        font-size: 4rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content-premium {
        grid-template-columns: 1fr;
    }
    
    .ceo-content {
        padding: 2rem;
    }
    
    .quote-mark {
        font-size: 4rem;
        top: 1rem;
        left: 1rem;
    }
}

@media (max-width: 480px) {
    .container,
    .container-fluid,
    .container-large {
        padding: 0 1rem;
    }
    
    /* Mobile Logo Image Styles */
    .logo-img {
        height: 140px;
        margin: -40px 0;
        /* 투명 로고 그림자 유지 */
        filter: drop-shadow(0 1px 3px rgba(0,0,0,0.08));
    }
    
    .footer-logo {
        height: 70px;
    }
    
    .hub-logo {
        width: 120px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
}

/* ===================================
   PROVEN BY GLOBAL LEADERS SECTION
   =================================== */

.proven-leaders-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, #f7fafc 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.proven-leaders-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect fill="rgba(10,79,163,0.02)" width="100" height="100"/><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(95,174,69,0.03)" stroke-width="1"/></svg>');
    background-size: 100px 100px;
    opacity: 0.5;
}

.proven-leaders-header {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
    z-index: 1;
}

.proven-leaders-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-family: var(--font-heading);
}

.proven-leaders-subtitle {
    font-size: 1.375rem;
    color: var(--accent-green);
    font-weight: 600;
    font-family: var(--font-heading);
}

.proven-diagram {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.proven-section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 2rem;
    font-family: var(--font-heading);
}

/* Left Side: Manufacturing Partners */
.proven-left {
    background: white;
    padding: 3rem;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border-left: 5px solid var(--primary-blue);
}

.proven-partners-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.proven-partner-item {
    padding: 1.25rem;
    background: var(--bg-light);
    border-radius: 8px;
    border-left: 3px solid var(--primary-blue);
    transition: all 0.3s ease;
}

.proven-partner-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--accent-green);
}

.proven-partner-item .partner-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.proven-partner-item .partner-desc {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

/* Center: S-CHEM Hub */
.proven-center {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.schem-hub {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    box-shadow: var(--shadow-xl), 0 0 60px rgba(10,79,163,0.3);
    position: relative;
    animation: pulse-hub 3s ease-in-out infinite;
}

@keyframes pulse-hub {
    0%, 100% {
        box-shadow: var(--shadow-xl), 0 0 60px rgba(10,79,163,0.3);
    }
    50% {
        box-shadow: var(--shadow-xl), 0 0 80px rgba(95,174,69,0.4);
    }
}

.schem-hub::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    border: 2px dashed rgba(10,79,163,0.3);
    border-radius: 50%;
    animation: rotate-border 20s linear infinite;
}

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

/* Hub Logo (Partners Section Center) - Transparent Version */
.hub-logo {
    width: 200px;
    height: auto;
    margin-bottom: 0.75rem;
    /* 투명 로고를 흰색으로 변환 */
    filter: brightness(0) invert(1) drop-shadow(0 4px 12px rgba(255, 255, 255, 0.3));
    transition: transform 0.3s ease;
}

.hub-logo:hover {
    transform: scale(1.1);
    filter: brightness(0) invert(1) drop-shadow(0 6px 16px rgba(255, 255, 255, 0.5));
}

.hub-label {
    font-size: 0.7rem;
    color: white;
    text-align: center;
    font-weight: 600;
    letter-spacing: 0.5px;
    line-height: 1.3;
}

/* Right Side: Applied Brands */
.proven-right {
    background: white;
    padding: 3rem;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border-right: 5px solid var(--accent-green);
}

.brand-cluster {
    margin-bottom: 2rem;
}

.brand-cluster:last-child {
    margin-bottom: 0;
}

.cluster-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent-green);
    margin-bottom: 1rem;
    font-family: var(--font-heading);
}

.cluster-brands {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.brand-name-proven {
    display: inline-block;
    background: linear-gradient(135deg, var(--bg-light), white);
    color: var(--text-dark);
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 700;
    border: 2px solid var(--border-light);
    transition: all 0.3s ease;
    font-family: var(--font-heading);
    letter-spacing: 0.5px;
}

.brand-name-proven:hover {
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Responsive for Proven Leaders */
@media (max-width: 1200px) {
    .proven-diagram {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .proven-center {
        order: 1;
    }
    
    .proven-left {
        order: 0;
    }
    
    .proven-right {
        order: 2;
    }
    
    .schem-hub {
        width: 180px;
        height: 180px;
    }
    
    .hub-logo {
        width: 140px;
    }
}

@media (max-width: 768px) {
    .proven-leaders-title {
        font-size: 2rem;
    }
    
    .proven-leaders-subtitle {
        font-size: 1.125rem;
    }
    
    .proven-left,
    .proven-right {
        padding: 2rem;
    }
    
    .schem-hub {
        width: 160px;
        height: 160px;
    }
    
    .hub-logo {
        width: 120px;
    }
    
    .cluster-brands {
        gap: 0.5rem;
    }
    
    .brand-name-proven {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */

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

.text-white {
    color: white;
}

/* Print Styles */
@media print {
    .header,
    .footer-premium,
    .hero-scroll-indicator,
    .lang-toggle,
    .mobile-menu-toggle {
        display: none;
    }
}