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

html {
    margin: 0;
    padding: 0;
    background-color: transparent;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: transparent;
    margin: 0;
    padding: 0;
}

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

/* Header Styles */
.header {
    background-color: transparent;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: none;
    transition: transform 0.3s ease-in-out;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: 70px;
    width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1002;
    align-self: center;
}

.mobile-menu-btn span {
    width: 100%;
    height: 3px;
    background-color: #fff;
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Logo Styles */
.logo {
    flex-shrink: 0;
    align-self: center;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    height: 100%;
}

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

/* Navigation Menu */
.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 30px;
    flex: 1;
    justify-content: flex-start;
    margin-left: 80px;
    align-self: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s ease;
    padding: 10px 0;
}

.nav-link:hover {
    color: #ff4444;
}

/* Dropdown Styles */
.dropdown-content {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 30px;
    width: 600px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1001;
    display: flex;
    gap: 30px;
}

.dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
}

/* Prevent dropdown clipping */
.nav-menu .nav-item:first-child .dropdown-content {
    left: 0;
    transform: translateX(0);
}

.nav-menu .nav-item:last-child .dropdown-content {
    left: auto;
    right: 0;
    transform: translateX(0);
}

.dropdown-section {
    flex: 1;
}

.dropdown-section h3 {
    color: #333;
    font-size: 20px;
    margin-bottom: 10px;
    font-weight: 600;
}

.dropdown-section p {
    color: #666;
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 20px;
}

.dropdown-cta {
    color: #ff4444;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: color 0.3s ease;
}

.dropdown-cta:hover {
    color: #cc3333;
}

.dropdown-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.dropdown-links a {
    color: #333;
    text-decoration: none;
    font-size: 14px;
    padding: 8px 0;
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.dropdown-links a:hover {
    color: #ff4444;
    border-bottom-color: #ff4444;
}

/* Navigation Utils */
.nav-utils {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
    padding-right: 10px;
    align-self: center;
}

.search-icon {
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    transition: color 0.3s ease;
}

.search-icon:hover {
    color: #ff4444;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 0;
    margin-bottom: 0;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    margin: 0;
    padding: 0;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    margin: 0;
    padding: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.4) 100%);
    z-index: -1;
    margin: 0;
    padding: 0;
}

.hero-content {
    text-align: left;
    color: #fff;
    max-width: 1200px;
    margin-left: 100px;
    padding: 0 20px;
    transform: translateY(calc(50vh + 150px));
    animation: fadeInUp 2.5s ease-out forwards;
    opacity: 1;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
    max-width: 600px;
}

.hero-description {
    font-size: 18px;
    line-height: 1.6;
    opacity: 0.9;
    max-width: 600px;
}

/* Hero Animation */
@keyframes fadeInUp {
    from {
        transform: translateY(calc(50vh + 150px));
        opacity: 0;
    }
    to {
        transform: translateY(calc(50vh - 70px));
        opacity: 1;
    }
}

/* Main Content */
.main-content {
    padding-top: 0;
    margin-top: 0;
    margin-bottom: 0;
}

.content-section {
    padding: 80px 0;
    background-color: transparent;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.content-section:first-child {
    padding-top: 0;
}

/* Section Background Colors */
#about {
    background-color: #fafafa; /* 부드러운 화이트 */
    color: #2d3748;
}

#gas-blocks {
    background-color: #2d3748; /* 세련된 다크 그레이 */
    color: #f7fafc;
}

#psa {
    background-color: #e53e3e; /* 세련된 레드 */
    color: #ffffff;
}

#lng-project {
    background-color: #63b3ed; /* 세련된 스카이 블루 */
    color: #1a202c;
}

#partnership {
    background-color: #edf2f7; /* 부드러운 라이트 그레이 */
    color: #2d3748;
}

#strategy {
    background-color: #3182ce; /* 세련된 딥 블루 */
    color: #ffffff;
}

#contact {
    background-color: #4a5568; /* 세련된 미드 그레이 */
    color: #f7fafc;
}

#documents {
    background-color: #1a202c; /* 세련된 다크 블루 그레이 */
    color: #e2e8f0;
}

.content-section h2 {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 20px;
    text-align: center;
}

.content-section p {
    font-size: 18px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* Section-specific text colors */
#about h2,
#about p {
    color: #2d3748;
}

#gas-blocks h2,
#gas-blocks p {
    color: #f7fafc;
}

#psa h2,
#psa p {
    color: #ffffff;
}

#lng-project h2,
#lng-project p {
    color: #1a202c;
}

#partnership h2,
#partnership p {
    color: #2d3748;
}

#strategy h2,
#strategy p {
    color: #ffffff;
}

#contact h2,
#contact p {
    color: #f7fafc;
}

#documents h2,
#documents p {
    color: #e2e8f0;
}

/* Footer */
.footer {
    background-color: #2c2c2c;
    color: #fff;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

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

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #ff4444;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
    color: #999;
    font-size: 14px;
}

/* Responsive Design */

/* Desktop (1025px+) - Regular menu */
@media (min-width: 1025px) {
    .nav-content {
        padding: 0 20px;
        height: 70px;
        justify-content: space-between;
    }
    
    .nav-menu {
        display: flex;
        gap: 30px;
        margin-left: 80px;
    }
    
    .mobile-menu-btn {
        display: none !important;
    }
    
    .logo {
        margin-left: 0;
    }
    
    .hero-content {
        max-width: 1200px;
        margin-left: 100px;
        padding: 0 20px;
        text-align: left;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .hero-description {
        font-size: 18px;
    }
}

/* Tablet Landscape (769px - 1024px) - Hamburger menu */
@media (min-width: 769px) and (max-width: 1024px) {
    .nav-content {
        padding: 0 15px;
        height: 70px;
        justify-content: flex-start;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex !important;
    }
    
    .logo {
        margin-left: 30px;
    }
    
    .logo-img {
        height: 35px;
    }
    
    .hero-content {
        max-width: 100%;
        margin-left: 0;
        padding: 0 60px;
        text-align: left;
    }
    
    .hero-title {
        font-size: 40px;
        max-width: 500px;
    }
    
    .hero-description {
        font-size: 18px;
    }
}

/* Tablet Portrait and Mobile (max-width: 1024px) - Hamburger menu */
@media (max-width: 1024px) {
    .nav-content {
        padding: 0 15px;
        height: 60px;
        justify-content: flex-start;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex !important;
    }
    
    .logo {
        margin-left: 30px;
    }
    
    .logo-img {
        height: 35px;
    }
    
    .nav-utils {
        gap: 15px;
    }
    
    .hero-content {
        max-width: 100%;
        margin-left: 0;
        padding: 0 40px;
        text-align: left;
    }
    
    .hero-title {
        font-size: 32px;
        max-width: 400px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .content-section {
        padding: 60px 0;
        min-height: 350px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .content-section h2 {
        font-size: 28px;
    }
    
    .content-section p {
        font-size: 16px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
        gap: 20px;
    }
}

/* Mobile (max-width: 480px) */
@media (max-width: 480px) {
    .nav-content {
        padding: 0 10px;
        height: 60px;
    }
    
    .logo-img {
        height: 30px;
    }
    
    .nav-utils {
        gap: 10px;
    }
    
    .hero-content {
        padding: 0 20px;
    }
    
    .hero-title {
        font-size: 24px;
        max-width: 300px;
    }
    
    .hero-description {
        font-size: 14px;
    }
    
    .content-section {
        padding: 40px 0;
        min-height: 300px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .content-section h2 {
        font-size: 20px;
    }
    
    .content-section p {
        font-size: 14px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 10px;
    }
}

/* Mobile Menu Styles */
@media (max-width: 1024px) {
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #2c2c2c;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .nav-menu.mobile-active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu .nav-item {
        width: 100%;
        text-align: center;
        margin: 10px 0;
    }
    
    .nav-menu .nav-link {
        display: block;
        padding: 15px 0;
        border-bottom: 1px solid #444;
    }
    
    .dropdown-content {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        background-color: #333;
        margin-top: 10px;
        border-radius: 0;
        flex-direction: column;
        gap: 20px;
        min-width: auto;
    }
    
    .dropdown-section h3 {
        color: #fff;
        font-size: 18px;
    }
    
    .dropdown-section p {
        color: #ccc;
    }
    
    .dropdown-cta {
        color: #ff4444;
    }
    
    .dropdown-links a {
        color: #fff;
        border-bottom-color: #555;
    }
    
    .dropdown-links a:hover {
        color: #ff4444;
    }
}