/* ===================================
   태경실업 홈페이지 스타일시트
   시안 톤: 산업/설비 (다크블루/그레이)
   특징: 모바일 배경 최적화, 전화문의 CTA
   =================================== */

/* 리셋 및 기본 설정 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 산업 톤 컬러 시스템 */
    --primary-dark: #0f2940;
    --primary-blue: #1a4d7a;
    --primary-blue-light: #2d6ba3;
    --accent-blue: #3a8bc9;
    --gray-900: #1a1a1a;
    --gray-800: #2a2a2a;
    --gray-700: #3a3a3a;
    --gray-600: #4a4a4a;
    --gray-500: #6a6a6a;
    --gray-400: #8a8a8a;
    --gray-300: #aaaaaa;
    --gray-200: #d0d0d0;
    --gray-100: #e8e8e8;
    --white: #ffffff;
    --black: #000000;
    
    /* 타이포그래피 */
    --font-family: 'Noto Sans KR', sans-serif;
    
    /* 레이아웃 */
    --container-width: 1200px;
    --header-height: 80px;
    
    /* 간격 */
    --section-padding: 100px;
    --card-gap: 30px;
    
    /* 트랜지션 */
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===================================
   헤더 A안: 로고 좌측 + 네비 우측
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo img {
    height: 63px;
    width: auto;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: var(--gray-800);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: var(--transition);
}

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

/* 전화문의 버튼 (헤더) */
.btn-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background-color: var(--primary-blue);
    color: var(--white);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
}

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

.btn-phone i {
    font-size: 14px;
}

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

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--gray-800);
    transition: var(--transition);
}

/* ===================================
   히어로 섹션: 좌측 정렬 + 배경 이미지
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to right,
        rgba(15, 41, 64, 0.85) 0%,
        rgba(15, 41, 64, 0.70) 40%,
        rgba(15, 41, 64, 0.50) 70%,
        rgba(15, 41, 64, 0.30) 100%
    );
    z-index: 2;
}

.hero .container {
    position: relative;
    z-index: 3;
}

.hero-content {
    max-width: 700px;
    color: var(--white);
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 40px;
    font-weight: 400;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

/* 버튼 스타일 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 6px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--primary-blue-light);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(58, 139, 201, 0.3);
}

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

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

/* ===================================
   특징 섹션
   =================================== */
.features {
    padding: 80px 0;
    background-color: var(--gray-100);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--card-gap);
}

.feature-card {
    background-color: var(--white);
    padding: 40px 30px;
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background-color: var(--primary-blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===================================
   제품 섹션
   =================================== */
.products {
    padding: var(--section-padding) 0;
    background-color: var(--white);
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray-600);
    text-align: center;
    margin-bottom: 60px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--card-gap);
}

.product-card {
    background-color: var(--gray-100);
    padding: 40px 30px;
    border-radius: 8px;
    transition: var(--transition);
    border: 2px solid transparent;
}

.product-card:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 8px 24px rgba(26, 77, 122, 0.15);
}

.product-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-dark);
    color: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 28px;
}

.product-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.product-card p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 20px;
}

.product-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.product-link:hover {
    color: var(--primary-dark);
    gap: 10px;
}

/* ===================================
   회사소개 섹션
   =================================== */
.about {
    padding: var(--section-padding) 0;
    background-color: var(--gray-100);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text .section-title {
    text-align: left;
    margin-bottom: 30px;
}

.about-description {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.stat-card {
    background-color: var(--primary-dark);
    padding: 40px;
    border-radius: 8px;
    text-align: center;
}

.stat-number {
    font-size: 56px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 18px;
    color: var(--gray-200);
    font-weight: 500;
}

/* ===================================
   자료실 섹션
   =================================== */
.resources {
    padding: var(--section-padding) 0;
    background-color: var(--white);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--card-gap);
}

.resource-card {
    background-color: var(--gray-100);
    padding: 50px 40px;
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.resource-icon {
    width: 80px;
    height: 80px;
    background-color: var(--primary-blue);
    color: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 36px;
}

.resource-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.resource-card p {
    font-size: 15px;
    color: var(--gray-600);
    margin-bottom: 20px;
}

.resource-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
}

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

/* ===================================
   고객지원 섹션
   =================================== */
.contact {
    padding: var(--section-padding) 0;
    background-color: var(--gray-100);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.info-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: 8px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.info-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-blue);
    color: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.info-card h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.info-card p {
    font-size: 17px;
    color: var(--gray-700);
    line-height: 1.6;
}

.info-card a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 17px;
}

.info-card a:hover {
    color: var(--primary-dark);
}

/* 문의 폼 */
.contact-form {
    background-color: var(--white);
    padding: 40px;
    border-radius: 8px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    padding: 14px;
    border: 2px solid var(--gray-200);
    border-radius: 6px;
    font-family: var(--font-family);
    font-size: 15px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.contact-form .btn-primary {
    grid-column: 1 / -1;
    justify-self: center;
    margin-top: 20px;
}

/* ===================================
   푸터
   =================================== */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo img {
    height: 58px;
    margin-bottom: 20px;
    /* filter 제거: 원래 로고 색상 유지 */
}

.footer-logo p {
    font-size: 15px;
    line-height: 1.6;
}

.footer-links h4,
.footer-contact h4 {
    color: var(--white);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
}

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

.footer-links li,
.footer-contact li {
    margin-bottom: 12px;
}

.footer-links a,
.footer-contact a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover,
.footer-contact a:hover {
    color: var(--white);
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    line-height: 1.5;
}

.footer-contact i {
    margin-top: 4px;
    color: var(--primary-blue-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--gray-700);
}

.footer-bottom p {
    font-size: 14px;
}

/* ===================================
   페이드인 애니메이션
   =================================== */
[data-fade] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-fade].fade-in {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================
   반응형: 태블릿 (968px 이하)
   =================================== */
@media (max-width: 968px) {
    :root {
        --section-padding: 80px;
        --card-gap: 24px;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* ===================================
   반응형: 모바일 (640px 이하)
   모바일 배경 최적화 포함
   =================================== */
@media (max-width: 640px) {
    :root {
        --header-height: 70px;
        --section-padding: 60px;
    }
    
    .container {
        padding: 0 16px;
    }
    
    /* 헤더 모바일 */
    .logo img {
        height: 46px;
    }
    
    .nav {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--white);
        transition: var(--transition);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }
    
    .nav.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        padding: 40px 20px;
        gap: 20px;
    }
    
    .nav-link {
        font-size: 18px;
    }
    
    .header-phone {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    /* 히어로 모바일 배경 최적화 */
    .hero {
        min-height: 90vh;
    }
    
    .hero-bg {
        /* 모바일: 배경 이미지를 우측으로 크롭하여 설비 중심 보이게 */
        background-position: 65% center;
        background-size: cover;
    }
    
    .hero-overlay {
        /* 모바일: 더 강한 오버레이로 텍스트 가독성 확보 */
        background: linear-gradient(
            to bottom,
            rgba(15, 41, 64, 0.88) 0%,
            rgba(15, 41, 64, 0.85) 50%,
            rgba(15, 41, 64, 0.82) 100%
        );
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-title {
        font-size: 32px;
        line-height: 1.3;
    }
    
    .hero-subtitle {
        font-size: 15px;
        line-height: 1.7;
        margin-bottom: 32px;
    }
    
    .hero-subtitle br {
        display: none;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        padding: 14px 28px;
    }
    
    /* 섹션 타이틀 */
    .section-title {
        font-size: 28px;
    }
    
    .section-subtitle {
        font-size: 15px;
    }
    
    /* 그리드 1열로 */
    .features-grid,
    .products-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    /* 통계 */
    .stat-number {
        font-size: 42px;
    }
    
    /* 문의 폼 */
    .contact-form {
        grid-template-columns: 1fr;
        padding: 30px 20px;
    }
}

/* ===================================
   초소형 모바일 (400px 이하)
   =================================== */
@media (max-width: 400px) {
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 14px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 15px;
    }
}