/* Zettabit - SI 전문업체 홈페이지 스타일 (Trendy & Fancy) */

:root {
    --color-primary: #0f0f1a;
    --color-secondary: #1a1a2e;
    --color-accent: #16213e;
    --color-highlight: #6366f1;
    --color-highlight-alt: #8b5cf6;
    --color-text: #1e1e2e;
    --color-text-light: #64748b;
    --color-white: #fff;
    --color-surface: #fafafa;
    --color-border: rgba(0, 0, 0, 0.06);
    --font-sans: "Noto Sans KR", "Outfit", "Malgun Gothic", sans-serif;
    --font-display: "Outfit", "Noto Sans KR", sans-serif;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    line-height: 1.8;
    overflow-x: hidden;
}

/* 헤더 & 네비게이션 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
}

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

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

.nav-link {
    color: var(--color-white);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-highlight);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-highlight);
}

.nav-lang {
    margin-left: 1rem;
}

.lang-select {
    padding: 0.35rem 0.6rem;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.lang-select:hover,
.lang-select:focus {
    background: rgba(255, 255, 255, 0.15);
    outline: none;
}

.lang-select option {
    background: var(--color-primary);
    color: var(--color-white);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: var(--transition);
}

body.menu-open {
    overflow: hidden;
}

/* 히어로 섹션 */
.hero {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    /* 메인 이미지 배경 (ZETTABIT, 고품질의 서비스를 제공하는 SI 전문업체) */
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    background-image: 
        linear-gradient(180deg, rgba(26, 26, 46, 0.4) 0%, rgba(26, 26, 46, 0.75) 100%),
        url('/image/main_image.jpg');
    background-size: cover;
    background-position: center;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    /* 원본 사이트처럼 배경 이미지가 잘 보이도록 약한 오버레이 */
    background: rgba(0, 0, 0, 0.25);
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 2rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.hero-tagline {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 400;
}

/* 컨테이너 */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 섹션 공통 */
section {
    padding: 5rem 0;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 2.5rem;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-highlight), var(--color-highlight-alt));
    margin: 0.75rem auto 0;
    border-radius: 2px;
}

/* 인사말 섹션 */
.greeting-section {
    background: var(--color-white);
}

.greeting-section .section-title {
    margin-top: 0;
}

.greeting-content {
    display: flex;
    gap: 2.5rem;
    align-items: flex-start;
}

.greeting-image-wrap {
    flex-shrink: 0;
}

.greeting-image {
    width: 420px;
    min-width: 320px;
    height: auto;
    border-radius: var(--radius-lg);
    object-fit: cover;
    box-shadow: var(--shadow-lg);
}

.greeting-text p {
    margin-bottom: 1rem;
    color: var(--color-text);
    font-size: 1rem;
}

.greeting-text strong {
    color: var(--color-primary);
}

.greeting-cta {
    margin-top: 2rem !important;
    font-size: 1.1rem;
    color: var(--color-accent) !important;
}

/* 사업영역 섹션 */
.business-section {
    background: linear-gradient(180deg, var(--color-surface) 0%, #fff 100%);
}

.section-eyebrow {
    display: block;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-highlight);
    margin-bottom: 0.5rem;
    text-align: center;
}

.business-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 3rem;
}

.business-description {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--color-text);
}

.business-intro-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.business-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.business-card {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.business-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.business-card h3 {
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
    font-weight: 700;
}

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

/* AI 솔루션 섹션 */
.ai-section {
    background: var(--color-white);
}

.ai-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 3rem;
}

.ai-intro-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.ai-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
}

.ai-intro-text .section-eyebrow {
    margin-bottom: 1rem;
    text-align: left;
}

.ai-description {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.ai-description:last-child {
    margin-bottom: 0;
}

.ai-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.ai-feature {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--color-surface) 0%, #fff 100%);
    border-left: 4px solid var(--color-highlight);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.ai-feature h4 {
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

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

.ai-automation-section {
    background: linear-gradient(180deg, var(--color-surface) 0%, #fff 100%);
}

.ai-automation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.ai-automation-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.auto-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
}

.ai-automation-desc {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.ai-automation-cta {
    display: inline-block;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-highlight);
    margin-top: 1.25rem;
    text-decoration: none;
    transition: var(--transition);
}

.ai-automation-cta:hover {
    color: var(--color-highlight-alt);
}

/* 문의 섹션 */
.contact-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    color: var(--color-white);
}

.contact-section .section-title {
    color: var(--color-white);
}

.contact-section .section-title::after {
    background: var(--color-highlight);
}

.contact-content {
    text-align: center;
}

.contact-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    opacity: 0.95;
}

.contact-ai-automation {
    margin-top: 4rem;
}

.contact-ai-automation .ai-automation-desc {
    color: rgba(255, 255, 255, 0.95);
}

.contact-ai-automation .ai-automation-cta {
    color: #a5b4fc;
}

.contact-ai-automation .ai-automation-cta:hover {
    color: var(--color-white);
}

.contact-subtitle {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1rem;
}

.contact-location {
    margin-top: 4rem;
}

.contact-address {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1rem;
}

.naver-map-wrap {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.map-container {
    width: 100%;
    height: 400px;
    background: #e5e7eb;
}

.map-naver-link {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: underline;
}

.map-naver-link:hover {
    color: var(--color-white);
}

.contact-btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--color-highlight), var(--color-highlight-alt));
    color: var(--color-white);
    text-decoration: none;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

/* 푸터 */
.footer {
    background: #0d0d1a;
    color: rgba(255, 255, 255, 0.7);
    padding: 2rem;
    text-align: center;
    font-size: 0.9rem;
}

/* 반응형 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 280px;
        height: 100vh;
        background: var(--color-primary);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1rem;
        transition: var(--transition);
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
    }

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

    .mobile-menu-btn {
        display: flex;
        z-index: 1001;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .nav-lang {
        margin-left: 0;
        padding-top: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .greeting-content {
        flex-direction: column;
        align-items: center;
    }

    .greeting-image {
        width: 100%;
        max-width: 420px;
        min-width: unset;
        margin: 0 auto;
        display: block;
    }

    .business-intro {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .business-intro-image {
        order: -1;
    }

    .business-image {
        height: 220px;
    }

    .ai-intro {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .ai-intro-image {
        order: -1;
    }

    .ai-image {
        height: 220px;
    }

    .ai-automation {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .ai-automation-image {
        order: -1;
    }

    .auto-image {
        height: 220px;
    }

    .map-container {
        height: 300px;
    }
}