:root {
    /* Color Palette - Clean White & Blue */
    --bg-main: #FFFFFF;
    --bg-light: #F8FAFC;
    --bg-card: #FFFFFF;
    --primary: #0047AB; /* Deep Trust Blue */
    --accent-blue: #0A84FF; /* Vibrant Blue for CTAs */
    --accent-silver: #64748B; /* Slate Gray */
    --text-primary: #0F172A; /* Very Dark Slate */
    --text-secondary: #475569; /* Slate Gray */
    
    --border-glass: rgba(0, 71, 171, 0.1);
    --shadow-glass: 0 10px 40px -10px rgba(0, 71, 171, 0.08); /* Soft blue shadow */
    
    /* Layout */
    --container-width: 1200px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
}

/* Typography Typography */
h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-primary);
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-glass);
    background: rgba(255, 255, 255, 0.9);
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 1rem 5%;
    box-shadow: 0 4px 20px rgba(0, 71, 171, 0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 0.2rem;
    margin-left: 1rem;
}

.lang-btn {
    background: none;
    border: none;
    padding: 0.4rem 0.8rem;
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 15px;
    transition: var(--transition);
}

.lang-btn:hover {
    color: var(--primary);
}

.lang-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 8px rgba(0, 71, 171, 0.2);
}

.lang-divider {
    width: 1px;
    height: 14px;
    background-color: var(--border-glass);
    margin: 0 0.2rem;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent-blue));
    color: white !important;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    border: 1px solid rgba(10, 132, 255, 0.3);
    box-shadow: 0 4px 15px rgba(10, 132, 255, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(10, 132, 255, 0.4);
}

.btn-primary.small {
    padding: 0.6rem 1.5rem;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    border: 2px solid var(--primary);
    transition: var(--transition);
}

.btn-outline:hover {
    background: rgba(0, 71, 171, 0.05);
    color: var(--primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 5%;
    overflow: hidden;
    background: #000; /* Fallback color */
}

/* Static Hero Background Image */
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background-image: url('hero_bg.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    pointer-events: none;
}

/* Spark Particle */
.spark {
    position: absolute;
    bottom: -20px;
    border-radius: 50%;
    background: #FFFFFF;
    box-shadow: 0 0 10px #AACCFF, 0 0 20px #0A84FF, 0 0 30px #FFFFFF;
    animation: rise infinite ease-in;
    opacity: 0;
}

/* Spark Animation */
@keyframes rise {
    0% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    50% {
        transform: translateY(-50vh) translateX(20px) scale(0.8);
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-120vh) translateX(-20px) scale(0.3);
        opacity: 0;
    }
}

/* Overlay to make text readable */
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 71, 171, 0.85) 0%, rgba(10, 132, 255, 0.3) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
}

.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    backdrop-filter: blur(5px);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
    color: #FFFFFF;
}

.hero-content .text-gradient {
    /* Since the background is now dark, we use a bright/white gradient */
    background: linear-gradient(135deg, #FFFFFF 0%, #AACCFF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 2vw, 1.5rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2.5rem;
    font-weight: 400;
}

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

.hero-cta .btn-outline {
    border-color: rgba(255, 255, 255, 0.5);
    color: #FFFFFF;
}

.hero-cta .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #FFFFFF;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

.scroll-indicator a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Animations */
@keyframes float {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(-30px) scale(1.1); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* Layout Utils */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    width: 100%;
}

.section {
    padding: 6rem 5%;
    position: relative;
    z-index: 2;
}

/* Alternate row background */
.section:nth-child(even) {
    background-color: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

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

.grid {
    display: grid;
    gap: 2rem;
}

/* Glass Card */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0,71,171,0.02) 0%, rgba(0,71,171,0) 100%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.glass-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-glass), 0 0 30px rgba(10, 132, 255, 0.05);
    border-color: rgba(10, 132, 255, 0.2);
}

.glass-card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    background: rgba(10, 132, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.glass-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.glass-card p {
    color: var(--text-secondary);
}

.glass-card strong {
    color: var(--primary);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.card-tags span {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    background: rgba(0, 71, 171, 0.05);
    border: 1px solid rgba(0, 71, 171, 0.1);
    border-radius: 30px;
    color: var(--primary);
    font-weight: 600;
}

/* What We Buy */
.cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card-image-wrapper {
    width: 100%;
    height: 200px; /* 사진 높이 (원하시는 대로 수정 가능합니다) */
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 1.5rem;
    background: rgba(10, 132, 255, 0.05); /* 사진이 로딩되기 전 표시될 배경색 */
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover; /* 사진 비율을 유지하면서 영역을 꽉 채움 */
    transition: transform 0.4s ease;
}

.glass-card:hover .card-image {
    transform: scale(1.05); /* 마우스를 올렸을 때 사진이 살짝 확대되는 효과 */
}

/* Sampling Process Timeline */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    align-items: center;
    gap: 4rem;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--shadow-glass);
    transition: var(--transition);
}

.timeline-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 71, 171, 0.1);
}

.timeline-item:nth-child(even) {
    background: linear-gradient(to right, var(--bg-card), var(--bg-light));
}

.timeline-item:nth-child(odd) {
    background: linear-gradient(to left, var(--bg-card), var(--bg-light));
}

.timeline-img-wrapper {
    flex: 1;
    border-radius: 16px;
    overflow: hidden;
    height: 300px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.timeline-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.timeline-content {
    flex: 1;
}

.step-badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: linear-gradient(135deg, var(--primary), var(--accent-blue));
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 50px;
    margin-bottom: 1rem;
    box-shadow: 0 4px 15px rgba(10, 132, 255, 0.3);
}

.timeline-content h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.timeline-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.process-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.process-list li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.process-list li::before {
    content: '•';
    color: var(--accent-blue);
    font-weight: bold;
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -5px;
}

.process-list li strong {
    color: var(--text-primary);
}

/* Our Strengths */
.strengths {
    background: var(--bg-light);
}

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

.strength-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    padding: 2rem;
    background: var(--bg-main);
    border-radius: 20px;
    border: 1px solid var(--border-glass);
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0,0,0,0.02);
}

.strength-item:hover {
    border-color: rgba(0, 71, 171, 0.2);
    box-shadow: 0 10px 30px rgba(0, 71, 171, 0.06);
    transform: translateY(-5px);
}

.strength-icon-wrapper {
    flex-shrink: 0;
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--accent-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 15px rgba(0, 71, 171, 0.2);
}

.strength-item h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--primary);
}

.strength-item p {
    color: var(--text-secondary);
}

/* Contact Section */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding: 4rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-item i {
    color: var(--accent-blue);
    background: rgba(10, 132, 255, 0.1);
    padding: 10px;
    border-radius: 10px;
    margin-top: -5px;
}

.contact-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.contact-item a, .contact-item p {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--accent-blue);
}

.section.contact {
    padding-bottom: 2rem;
}

/* Contact Form Styles */
.form-box {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--border-glass);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 71, 171, 0.08);
    position: relative;
    z-index: 10;
}

.form-box h3 {
    color: var(--primary);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    position: relative;
    z-index: 11;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input, .form-group select, .form-group textarea {
    padding: 0.8rem 1rem;
    border: 1px solid #E2E8F0;
    border-radius: 10px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--bg-light);
    position: relative;
    z-index: 12;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.1);
    background: white;
}

.form-box .btn-primary {
    border: none;
    cursor: pointer;
    position: relative;
    z-index: 12;
}

.large-btn {
    font-size: 1.2rem;
    padding: 1.2rem 2rem;
    justify-content: center;
    width: 100%;
}

.spin {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-glass);
    padding: 2rem 5%;
    margin-top: 0;
    background: var(--bg-light);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.social-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(10, 132, 255, 0.1);
    color: var(--accent-blue);
    transition: var(--transition);
}

.social-icon:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 71, 171, 0.3);
}

/* Scroll Animation Classes */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
    transition-delay: var(--delay, 0s);
}

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

/* Responsive Extra */
@media (max-width: 992px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 2rem;
        gap: 3rem;
    }
}

/* Responsive Mobile Fixes */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 75px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-glass);
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        opacity: 0;
        display: flex;
        z-index: 999;
        box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
    }

    .lang-toggle {
        margin-left: 0;
        margin-top: 1rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .mobile-menu-btn {
        display: block;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-cta .btn-primary, .hero-cta .btn-outline {
        justify-content: center;
    }
    
    /* Contact Mobile Fixes */
    .contact-wrapper {
        padding: 1.5rem 1rem;
        gap: 2rem;
    }
    
    .form-box {
        padding: 1.5rem 1.2rem;
    }
    
    .contact-details {
        gap: 1.5rem;
    }

    /* Timeline Mobile Fixes */
    .timeline-item {
        flex-direction: column !important;
        gap: 2rem;
        padding: 1.5rem;
    }
    
    .timeline-img-wrapper {
        width: 100%;
        height: 250px;
    }
    
    .timeline-content.right-align {
        text-align: left;
    }
}