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

:root {
    --primary-gradient: linear-gradient(135deg, #82A0BC 0%, #1F2C43 100%);
    --secondary-gradient: linear-gradient(135deg, #57f9d8 0%, #8601fa 100%);
    --accent-gradient: linear-gradient(135deg, #f7f179 0%, #b6ff85 100%);

    --primary-color: #1F2C43;
    --secondary-color: #2F60E0;
    --accent-color: #4facfe;

    --text-dark: #2d3748;
    --text-light: #718096;
    --text-lighter: #a0aec0;

    --bg-light: #f7fafc;
    --bg-white: #ffffff;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-md: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
    --shadow-xl: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.8rem); }
h4 { font-size: clamp(1rem, 2.5vw, 1.3rem); }

p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.lead {
    font-size: 1.25rem;
    font-weight: 300;
    margin-bottom: 1.5rem;
}

.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Progress Bar */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--primary-gradient);
    z-index: 9999;
    transition: width var(--transition-normal);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(255, 255, 255, 0.98);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width var(--transition-normal);
}

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

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Language Selector */
.language-selector {
    position: relative;
}

.lang-btn {
    background: transparent;
    border: 2px solid var(--text-lighter);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dark);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-btn:hover {
    border-color: var(--primary-color);
    background: rgba(31, 44, 67, 0.05);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-dark);
    transition: all var(--transition-fast);
    border-bottom: 1px solid #f0f0f0;
}

.lang-option:last-child {
    border-bottom: none;
}

.lang-option:hover {
    background: rgba(31, 44, 67, 0.05);
}

.lang-option.selected {
    background: rgba(31, 44, 67, 0.1);
    font-weight: 600;
}

.lang-option .flag {
    font-size: 1.2rem;
}

.lang-option .lang-name {
    font-size: 0.9rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: var(--transition-normal);
    border-radius: 3px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.gradient-bg {
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background: linear-gradient(
        45deg,
        #2F60E0 0%,
        #0084ff 25%,
        #82A0BC 50%,
        #4facfe 75%,
        #667eea 100%
    );
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    opacity: 0.1;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0.3;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--primary-gradient);
    top: 10%;
    left: 10%;
    animation: float 20s infinite ease-in-out;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--secondary-gradient);
    top: 60%;
    right: 10%;
    animation: float 25s infinite ease-in-out reverse;
}

.shape-3 {
    width: 250px;
    height: 250px;
    background: var(--accent-gradient);
    bottom: 10%;
    left: 50%;
    animation: float 22s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(30px, -30px) rotate(90deg); }
    50% { transform: translate(-20px, 20px) rotate(180deg); }
    75% { transform: translate(40px, 10px) rotate(270deg); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding: 2rem;
}

.hero-title {
    margin-bottom: 1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.subtitle {
    display: block;
    font-size: 0.4em;
    font-weight: 400;
    color: var(--text-light);
    margin-top: 0.5rem;
}

.hero-tagline {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 2rem;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
}

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

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

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

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(255, 255, 255, 0.3);
}

.btn-outline-white {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

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

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--primary-color);
    border-radius: 25px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 2px;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    animation: wheel 1.5s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

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

/* Sections */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.section-header img {
    margin-bottom: 40px;
    width: 45%;
    height:auto;
}


.section-title {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 400;
}

/* About Section */
.about {
    background: var(--bg-light);
}

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

.about-content h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

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

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.about-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    width: 100%;
}

.visual-card {
    perspective: 1000px;
    height: 250px;
    width: 100%;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.visual-card:hover .card-inner {
    transform: rotateY(180deg);
}

@media (hover: hover) and (pointer: fine) {
    .visual-card:hover .card-inner {
        transform: rotateY(180deg);
    }
}

@media (hover: none) and (pointer: coarse) {
    .visual-card:active .card-inner {
        transform: rotateY(180deg);
    }
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    text-align: center;
}

.card-back {
    transform: rotateY(180deg);
    background: var(--primary-gradient);
    color: white;
}

.icon-wrapper {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.icon {
    width: 30px;
    height: 30px;
    color: white;
}

.card-front h4 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    word-break: keep-all;
}

.card-front p {
    color: var(--text-light);
    font-size: 0.9rem;
    word-break: keep-all;
}

.card-back p {
    word-break: keep-all;
    line-height: 1.6;
}

/* Service Section */
.service {
    position: relative;
    background: white;
    overflow: hidden;
}

.parallax-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    z-index: -1;
}

.service-intro {
    max-width: 800px;
    margin: 0 auto 3rem;
    text-align: center;
}

.service-description {
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.service-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    text-align: center;
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 40px;
    height: 40px;
    color: white;
}

.feature-card h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Timeline */
.timeline {
    margin-top: 4rem;
}

.timeline-title {
    font-size: 22px;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.timeline-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.timeline-container::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--primary-gradient);
}

.timeline-item {
    position: relative;
    padding: 20px 40px;
    width: 50%;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
    padding-right: 60px;
}

.timeline-item:nth-child(even) {
    left: 50%;
    padding-left: 60px;
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border: 4px solid var(--primary-color);
    border-radius: 50%;
    top: 30px;
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -10px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Features Grid Section */
.features {
    background: var(--bg-light);
}

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

.feature-box {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary-gradient);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
}

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

.feature-box:hover::before {
    transform: translateX(0);
}

.feature-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.feature-box h3 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.feature-box p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* CTA Section */
.cta {
    background: var(--primary-gradient);
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M0 40L40 0H20L0 20M40 40V20L20 40'/%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta h2 {
    color: white;
    margin-bottom: 1rem;
}

.cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

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

.cta-buttons .btn i,
.cta-buttons .btn img {
    margin-right: 8px;
    vertical-align: middle;
}

.cta-buttons .btn img {
     height: 1.2em;
     width : auto;
      vertical-align: middle;
}

/* Footer */
.footer {
    background: #1a202c;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-contact ul li.grey-color {
    color : rgba(255, 255, 255, 0.7);
}

.footer-brand h3 {
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer ul {
    list-style: none;
}

.footer li {
    margin-bottom: 0.5rem;
}

.footer a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: white;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.social-links svg {
    width: 20px;
    height: 20px;
    color: white;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-gradient);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

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

.back-to-top svg {
    width: 24px;
    height: 24px;
    color: white;
}

/* Utilities */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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