/* 기본 설정 */
:root {
    --primary-color: #0050FF;
    --secondary-color: #f5f5f5;
    --white: #ffffff;
    --dark: #333333;
    --gray: #888888;
    --light-gray: #f5f5f5;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Noto Sans KR', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    line-height: 1.2;
}

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

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

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

section {
    padding: 80px 0;
}

section h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 40px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    box-shadow: var(--shadow);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

/* 헤더 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--white);
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo a {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.main-nav {
    display: flex;
    align-items: center;
}

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

.nav-links a {
    margin-left: 20px;
    font-weight: 500;
}

/* 언어 선택기 스타일 */
.language-selector {
    display: flex;
    align-items: center;
    margin-right: 15px;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--gray);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    padding: 5px 8px;
    border-radius: 3px;
    transition: var(--transition);
}

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

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

.signup-btn {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 8px 16px;
    border-radius: 20px;
}

.signup-btn:hover {
    background-color: #0040cc;
    color: var(--white);
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn .bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px 0;
    transition: var(--transition);
}

/* Hero 섹션 */
.hero {
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    background-image: url('../img/bg-hero.jpg');
    background-size: cover;
    background-position: center;
    position: relative;
    margin-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    color: var(--white);
    text-align: center;
    margin: 0 auto;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

/* AI 지원 기능 섹션 */
.features {
    background-color: var(--light-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background-color: var(--white);
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

/* 갤러리 섹션 */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.gallery-item {
    position: relative;
    cursor: pointer;
    transition: var(--transition);
}

.gallery-item:hover {
    transform: translateY(-5px);
}

.gallery-image {
    position: relative;
    overflow: hidden;
    border-radius: 10px;
}

.gallery-image img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition);
}

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

.ai-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.gallery-item h4 {
    margin-top: 15px;
    font-size: 1.1rem;
    text-align: center;
}

/* 사용자 피드백 섹션 */
.testimonials {
    background-color: var(--light-gray);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.testimonial-card {
    background-color: var(--white);
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
}

.testimonial-content {
    margin-bottom: 20px;
}

.testimonial-content p {
    font-style: italic;
    font-size: 1.1rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.author-image {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
    margin-right: 15px;
}

.author-info h4 {
    margin-bottom: 5px;
}

.author-info p {
    color: var(--gray);
}

/* CTA 섹션 */
.cta {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
}

.cta h2 {
    color: var(--white);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* 푸터 */
.footer {
    background-color: var(--dark);
    color: var(--white);
    padding-top: 60px;
    padding-bottom: 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo img {
    height: 40px;
    margin-bottom: 15px;
}

.footer-links h4, .footer-social h4 {
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--white);
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
}

.social-icons {
    display: flex;
}

.social-icons a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    margin-right: 10px;
    color: var(--white);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 반응형 */
@media (max-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 80px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
        z-index: 1000;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links a {
        margin: 20px 0;
        font-size: 1.2rem;
    }
}

@media (max-width: 576px) {
    section {
        padding: 60px 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .cta-buttons .btn {
        margin-bottom: 15px;
    }
}