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

:root {
    --primary-color: #4A90E2;
    --secondary-color: #2C3E50;
    --accent-color: #E74C3C;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --white: #FFFFFF;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", 
                 "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

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

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5em;
    text-align: center;
    margin-bottom: 15px;
    color: var(--secondary-color);
    font-weight: 700;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1em;
    color: var(--text-light);
    margin-bottom: 50px;
}

/* 헤더 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: all 0.3s ease;
    padding: 20px 0;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
    padding: 15px 0;
}

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

.logo {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--white);
    transition: color 0.3s;
}

.header.scrolled .logo {
    color: var(--primary-color);
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    position: relative;
}

.header.scrolled .nav a {
    color: var(--text-dark);
}

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

.nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

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

/* 모바일 메뉴 버튼 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--white);
    transition: all 0.3s;
    border-radius: 3px;
}

.header.scrolled .mobile-menu-btn span {
    background: var(--text-dark);
}

/* 모바일 메뉴 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    padding: 20px;
    transform: translateY(-100%);
    transition: transform 0.3s;
    z-index: 999;
}

.mobile-menu.active {
    transform: translateY(0);
}

.mobile-menu a {
    display: block;
    padding: 15px;
    color: var(--text-dark);
    text-decoration: none;
    border-bottom: 1px solid #eee;
    transition: background 0.3s;
}

.mobile-menu a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

/* 메인 비주얼 */
.hero {
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-image: url('https://images.unsplash.com/photo-1434030216411-0b793f4b4173?w=1600&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    color: var(--white);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.85) 0%, rgba(52, 73, 94, 0.85) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero h1 {
    font-size: 3.5em;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.4em;
    margin-bottom: 40px;
    opacity: 0.95;
}

.cta-button {
    display: inline-block;
    padding: 15px 40px;
    background: var(--white);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1em;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

/* 앱 섹션 */
.apps-section {
    background: var(--white);
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.app-card {
    background: var(--white);
    border-radius: 15px;
    padding: 35px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 1px solid #f0f0f0;
}

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

.app-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--primary-color), #667eea);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.icon-placeholder {
    font-size: 40px;
}

.app-card h3 {
    font-size: 1.5em;
    margin-bottom: 15px;
    color: var(--secondary-color);
    text-align: center;
}

.app-description {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 25px;
    font-size: 1.05em;
}

.app-features {
    list-style: none;
    margin-bottom: 25px;
}

.app-features li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
    color: var(--text-dark);
    border-bottom: 1px solid #f5f5f5;
}

.app-features li:last-child {
    border-bottom: none;
}

.app-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2em;
}

.download-badges {
    text-align: center;
    margin-top: 25px;
}

.badge-link img {
    height: 50px;
    transition: transform 0.3s;
}

.badge-link:hover img {
    transform: scale(1.05);
}

/* 회사 소개 섹션 */
.about-section {
    background: var(--bg-light);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 2em;
    color: var(--primary-color);
    margin-bottom: 20px;
    text-align: center;
}

.about-text p {
    font-size: 1.1em;
    line-height: 1.8;
    margin-bottom: 20px;
    text-align: justify;
    color: var(--text-dark);
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.feature-item {
    background: var(--white);
    padding: 25px;
    border-radius: 10px;
    display: flex;
    align-items: start;
    gap: 15px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

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

.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.feature-text h4 {
    margin-bottom: 5px;
    color: var(--secondary-color);
}

.feature-text p {
    color: var(--text-light);
    font-size: 0.95em;
    margin: 0;
}

/* 공지사항 섹션 */
.notice-section {
    background: var(--white);
}

.notice-list {
    max-width: 800px;
    margin: 0 auto;
}

.notice-item {
    background: var(--bg-light);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s;
}

.notice-item:hover {
    background: var(--white);
    box-shadow: var(--shadow);
    transform: translateX(5px);
}

.notice-date {
    display: inline-block;
    color: var(--text-light);
    font-size: 0.9em;
    margin-bottom: 10px;
}

.notice-item h3 {
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-size: 1.3em;
}

.notice-item p {
    color: var(--text-dark);
    line-height: 1.6;
}

/* 푸터 */
.footer {
    background: var(--secondary-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.5em;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-section h4 {
    font-size: 1.2em;
    margin-bottom: 15px;
    color: var(--white);
}

.footer-section p {
    margin-bottom: 10px;
    color: rgba(255, 255, 255, 0.8);
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-info {
    padding: 30px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-info p {
    margin-bottom: 8px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95em;
}

.text-muted {
    color: rgba(255, 255, 255, 0.6) !important;
}

.small {
    font-size: 0.85em;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    color: rgba(255, 255, 255, 0.6);
}

/* 반응형 - 태블릿 */
@media (max-width: 992px) {
    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 2em;
    }

    .hero h1 {
        font-size: 2.5em;
    }

    .hero p {
        font-size: 1.2em;
    }

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

    .about-features {
        grid-template-columns: 1fr;
    }
}

/* 반응형 - 모바일 */
@media (max-width: 768px) {
    .nav {
        display: none;
    }

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

    .mobile-menu {
        display: block;
    }

    .hero {
        min-height: 500px;
        background-attachment: scroll;
    }

    .hero h1 {
        font-size: 2em;
    }

    .hero p {
        font-size: 1.1em;
    }

    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 1.8em;
    }

    .app-card {
        padding: 25px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .cta-button {
        padding: 12px 30px;
        font-size: 1em;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero h1 {
        font-size: 1.6em;
    }

    .hero p {
        font-size: 1em;
    }

    .section-title {
        font-size: 1.5em;
    }

    .app-card h3 {
        font-size: 1.3em;
    }

    .about-text h3 {
        font-size: 1.5em;
    }
}