/* ================================
   CSS Reset & Base Styles
   ================================ */

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

:root {
    /* Colors - Refined palette based on reference */
    --color-primary: #000000;
    --color-secondary: #0f0f0f;
    --color-accent: #4a90e2;
    --color-accent-light: #6ba3e8;
    --color-text: #ffffff;
    --color-text-muted: #b0b0b0;
    --color-border: #2a2a2a;
    --color-overlay: rgba(0, 0, 0, 0.7);
    --color-card-bg: #1a1a1a;
    
    /* Typography */
    --font-primary: 'Inter', 'Noto Sans KR', sans-serif;
    --font-korean: 'Noto Sans KR', sans-serif;
    
    /* Spacing - More generous */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Container */
    --container-max-width: 1400px;
    --container-padding: 3rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-primary);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    font-weight: 400;
}

html {
    scroll-behavior: smooth;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-normal);
}

button {
    font-family: inherit;
    cursor: pointer;
}

/* ================================
   Container
   ================================ */

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ================================
   Navigation
   ================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-normal);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem var(--container-padding);
}

.nav-brand .logo {
    height: 45px;
    width: auto;
    transition: var(--transition-normal);
}

.nav-brand .logo:hover {
    opacity: 0.8;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 3rem;
    align-items: center;
}

.nav-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    transition: var(--transition-normal);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition-normal);
}

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

.nav-menu a:hover {
    color: var(--color-accent-light);
}

.nav-cta {
    padding: 0.7rem 1.8rem;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-radius: 8px;
    transition: var(--transition-normal);
    font-weight: 600;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(74, 144, 226, 0.3);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 28px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-normal);
}

/* ================================
   Hero Section
   ================================ */

.hero {
    position: relative;
    height: 100vh;
    min-height: 800px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0.6) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 1000px;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5.5rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #ffffff 0%, #c0c0c0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--color-accent-light);
    margin-bottom: 2.5rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero-description {
    font-size: clamp(1.05rem, 1.5vw, 1.25rem);
    color: var(--color-text-muted);
    margin-bottom: 3.5rem;
    line-height: 1.9;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-description p {
    margin-bottom: 0.7rem;
}

.hero-btn {
    display: inline-block;
    padding: 1.2rem 3.5rem;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition-normal);
    box-shadow: 0 15px 40px rgba(74, 144, 226, 0.3);
    letter-spacing: 0.05em;
}

.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 50px rgba(74, 144, 226, 0.4);
}

.scroll-indicator {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator span {
    display: block;
    width: 2px;
    height: 50px;
    background: linear-gradient(to bottom, transparent, var(--color-accent));
    animation: scroll 2.5s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% {
        opacity: 0;
        transform: translateY(-20px);
    }
    50% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade In Animations */
.fade-in {
    animation: fadeIn 1.2s ease-out;
}

.fade-in-delay {
    animation: fadeIn 1.2s ease-out 0.3s both;
}

.fade-in-delay-2 {
    animation: fadeIn 1.2s ease-out 0.6s both;
}

.fade-in-delay-3 {
    animation: fadeIn 1.2s ease-out 0.9s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ================================
   Section Common Styles
   ================================ */

section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: white;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

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

.section-subtitle {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 700;
    margin-bottom: 2.5rem;
    color: var(--color-accent-light);
    letter-spacing: -0.01em;
}

.section-intro {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 750px;
    margin: 0 auto;
    line-height: 1.8;
}

.section-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    align-items: center;
}

.section-grid.reverse {
    direction: rtl;
}

.section-grid.reverse > * {
    direction: ltr;
}

.section-image {
    overflow: hidden;
    border-radius: 16px;
    position: relative;
}

.section-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition-slow);
}

.section-image:hover::after {
    opacity: 1;
}

.section-image img,
.section-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
    border-radius: 16px;
}

.section-image:hover img,
.section-image:hover video {
    transform: scale(1.05);
}

.section-content {
    padding: var(--spacing-md);
}

.section-text p {
    margin-bottom: 1.8rem;
    color: var(--color-text-muted);
    font-size: 1.1rem;
    line-height: 1.9;
}

/* ================================
   Philosophy Section
   ================================ */

.philosophy {
    background-color: var(--color-secondary);
}

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

.stat-item {
    text-align: center;
    padding: 2.5rem 2rem;
    background: linear-gradient(135deg, var(--color-card-bg) 0%, var(--color-secondary) 100%);
    border-radius: 16px;
    transition: var(--transition-normal);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.stat-item:hover::before {
    transform: scaleX(1);
}

.stat-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border-color: var(--color-accent);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--color-accent-light);
    margin-bottom: 0.8rem;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 1rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-weight: 500;
}

/* ================================
   Core Values Section
   ================================ */

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

.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: var(--spacing-md);
}

.value-card {
    background: linear-gradient(135deg, var(--color-card-bg) 0%, var(--color-secondary) 100%);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--color-border);
    position: relative;
}

.value-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition-normal);
    z-index: 1;
}

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

.value-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
    border-color: var(--color-accent);
}

.value-image {
    height: 280px;
    overflow: hidden;
    position: relative;
}

.value-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
}

.value-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.value-card:hover .value-image img {
    transform: scale(1.1);
}

.value-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 2rem 2rem 1.2rem 2rem;
    color: white;
    letter-spacing: -0.01em;
    position: relative;
    z-index: 2;
}

.value-text {
    padding: 0 2rem 2rem 2rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    font-size: 1.05rem;
    position: relative;
    z-index: 2;
}

/* ================================
   Services Section
   ================================ */

.services {
    background-color: var(--color-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    margin-top: var(--spacing-md);
}

.service-card {
    padding: 3rem;
    background: linear-gradient(135deg, var(--color-card-bg) 0%, var(--color-secondary) 100%);
    border-radius: 20px;
    transition: var(--transition-normal);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition-normal);
}

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
    border-color: var(--color-accent);
}

.service-icon {
    width: 70px;
    height: 70px;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
}

.service-icon svg {
    width: 35px;
    height: 35px;
    stroke: white;
}

.service-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: white;
    letter-spacing: -0.01em;
}

.service-text {
    color: var(--color-text-muted);
    line-height: 1.9;
    font-size: 1.05rem;
}

/* ================================
   Why Us Section
   ================================ */

.why-us {
    background-color: var(--color-primary);
}

.why-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    margin-top: 2.5rem;
}

.why-item {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    padding: 2rem;
    background: linear-gradient(135deg, var(--color-card-bg) 0%, transparent 100%);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    transition: var(--transition-normal);
}

.why-item:hover {
    transform: translateX(10px);
    border-color: var(--color-accent);
    background: linear-gradient(135deg, var(--color-card-bg) 0%, rgba(74, 144, 226, 0.05) 100%);
}

.why-icon {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.why-item:hover .why-icon {
    transform: scale(1.15) rotate(5deg);
}

.why-icon svg {
    width: 28px;
    height: 28px;
    stroke: white;
    stroke-width: 3;
}

.why-content h4 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: white;
    letter-spacing: -0.01em;
}

.why-content p {
    color: var(--color-text-muted);
    line-height: 1.8;
    font-size: 1.05rem;
}

/* ================================
   Contact Section
   ================================ */

.contact {
    background-color: var(--color-secondary);
    padding: var(--spacing-xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.contact-info {
    padding-right: 2rem;
}

.contact-intro {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    margin-bottom: 3.5rem;
    line-height: 1.8;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.contact-item {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--color-card-bg) 0%, transparent 100%);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: var(--transition-normal);
}

.contact-item:hover {
    border-color: var(--color-accent);
    transform: translateX(5px);
}

.contact-icon {
    width: 55px;
    height: 55px;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
}

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

.contact-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: white;
}

.contact-item p,
.contact-item a {
    color: var(--color-text-muted);
    font-size: 1rem;
}

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

/* Contact Form */
.contact-form-wrapper {
    background: linear-gradient(135deg, var(--color-card-bg) 0%, var(--color-secondary) 100%);
    padding: 3rem;
    border-radius: 20px;
    border: 1px solid var(--color-border);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.form-group label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 1rem 1.3rem;
    background-color: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-text);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.form-submit {
    padding: 1.2rem 3rem;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    transition: var(--transition-normal);
    cursor: pointer;
    letter-spacing: 0.05em;
}

.form-submit:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(74, 144, 226, 0.4);
}

/* ================================
   Footer
   ================================ */

.footer {
    background-color: var(--color-primary);
    padding: var(--spacing-lg) 0 var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-logo {
    height: 40px;
    width: auto;
}

.footer-tagline {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.footer-links {
    display: flex;
    gap: 2.5rem;
}

.footer-links a {
    font-size: 1rem;
    color: var(--color-text-muted);
    transition: var(--transition-normal);
    font-weight: 500;
}

.footer-links a:hover {
    color: var(--color-accent-light);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.footer-legal {
    display: flex;
    gap: 2rem;
}

.footer-legal a {
    transition: var(--transition-normal);
}

.footer-legal a:hover {
    color: var(--color-accent-light);
}

/* ================================
   Reveal Animations
   ================================ */

.reveal-image {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 1s ease, transform 1s ease;
}

.reveal-image.revealed {
    opacity: 1;
    transform: scale(1);
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 1024px) {
    :root {
        --container-padding: 2rem;
        --spacing-xl: 5rem;
        --spacing-lg: 3rem;
    }

    .section-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .values-grid {
        grid-template-columns: 1fr;
    }

    .philosophy-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .contact-info {
        padding-right: 0;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 85px;
        left: -100%;
        flex-direction: column;
        background-color: rgba(0, 0, 0, 0.98);
        width: 100%;
        padding: 2.5rem;
        gap: 2rem;
        transition: var(--transition-normal);
        border-bottom: 1px solid var(--color-border);
        backdrop-filter: blur(20px);
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        min-height: 700px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .philosophy-stats {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 2.5rem;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1.5rem;
        --spacing-xl: 4rem;
        --spacing-lg: 2.5rem;
    }

    .hero-btn {
        padding: 1rem 2.5rem;
        font-size: 1rem;
    }

    .service-card,
    .value-card {
        padding: 2rem;
    }

    .contact-form-wrapper {
        padding: 2rem;
    }
    
    .stat-item {
        padding: 2rem 1.5rem;
    }
    
    .why-item {
        padding: 1.5rem;
    }
}