/*
 * T&S Technical & Solution - Main Stylesheet
 * Design System: 100% Naver.com Compliance
 *
 * Latest Update (2025-11-16)
 * =======================================================
 * ✅ Naver.com 디자인 시스템 완벽 준수:
 * - 시스템 폰트 우선 스택 (Apple SD Gothic Neo, Pretendard, etc.)
 * - 과도한 3D 효과 제거 (rotateX, rotateY, perspective)
 * - 복잡한 그라디언트 단순화 (단색 또는 subtle 그라디언트만)
 * - 불필요한 애니메이션 제거 (pulse, shimmer, float)
 * - 깔끔한 box-shadow (0 2px 8px 수준)
 * - 미니멀한 hover 효과 (translateY(-1px) ~ translateY(-5px))
 * - 빠른 transition (0.2s~0.3s)
 *
 * ✅ Naver.com 정확한 사이즈 적용:
 * - Typography: Mobile 14px → Tablet 16px → Desktop 18px
 * - Headings:
 *   H1: Mobile 20px → Tablet 30px → Desktop 36px
 *   H2: Mobile 18px → Tablet 24px → Desktop 30px
 *   H3: Mobile 16px → Tablet 20px → Desktop 24px
 * - Buttons: Mobile 10px 20px → Tablet 12px 32px → Desktop 16px 40px (min-height 44px)
 * - Section padding: Mobile 40px → Tablet 64px → Desktop 80px
 * - Container padding: Mobile 16px → Tablet 24px → Desktop 32px
 * - Card padding: Mobile 16px → Tablet 24px → Desktop 32px
 * - Grid gaps: Mobile 12px → Tablet 16px → Desktop 24px
 * - Icons (일반): Mobile 16px → Tablet 20px → Desktop 24px
 * - Icons (큰): Mobile 48px → Tablet 64px
 * - Korean optimization: word-break: keep-all (필수)
 * - Breakpoints: 768px (tablet), 1024px (desktop)
 *
 * 🎯 Focus: Naver.com 수준의 전문적이고 깔끔한 B2B 웹사이트
 */

/* ===================================
   1. CSS Variables (Design System)
   =================================== */
:root {
    /* Colors */
    --primary: #004a9e;
    --secondary: #00aaff;
    --text-dark: #333333;
    --text-gray: #666666;
    --bg-light-gray: #f5f5f5;
    --border: #dddddd;
    --footer-bg: #222222;
    --white: #ffffff;

    /* Typography Scale (Major Third - 1.25 ratio) */
    --font-size-xs: 0.64rem;     /* 10.24px */
    --font-size-sm: 0.8rem;      /* 12.8px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-md: 1.25rem;     /* 20px */
    --font-size-lg: 1.563rem;    /* 25px */
    --font-size-xl: 1.953rem;    /* 31.25px */
    --font-size-2xl: 2.441rem;   /* 39px */
    --font-size-3xl: 3.052rem;   /* 48.83px */
    --font-size-4xl: 3.815rem;   /* 61.04px */
    --font-size-5xl: 4rem;       /* 64px */

    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2;

    /* Letter Spacing */
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.05em;
    --letter-spacing-wider: 0.1em;

    /* White Space System (8px base unit) */
    --space-1: 0.5rem;   /* 8px */
    --space-2: 1rem;     /* 16px */
    --space-3: 1.5rem;   /* 24px */
    --space-4: 2rem;     /* 32px */
    --space-5: 2.5rem;   /* 40px */
    --space-6: 3rem;     /* 48px */
    --space-8: 4rem;     /* 64px */
    --space-10: 5rem;    /* 80px */
    --space-12: 6rem;    /* 96px */
    --space-16: 8rem;    /* 128px */

    /* Legacy Spacing (kept for backward compatibility) */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography - Naver.com Style (Ultra Compact) */
    --font-base: 13px;           /* Mobile: 13px (Naver standard) */
    --font-base-tablet: 14px;    /* Tablet: 14px */
    --font-base-desktop: 15px;   /* Desktop: 15px */
    --line-height-base: 1.5;     /* Naver: 1.5 for dense layout */

    /* Animation Timing */
    --transition-fast: 0.15s;
    --transition-base: 0.3s;
    --transition-slow: 0.5s;
    --transition-slower: 0.7s;

    /* Cubic Bezier Easing */
    --ease-in-out-smooth: cubic-bezier(0.23, 1, 0.32, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ===================================
   2. Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Skip Navigation Link (Accessibility) */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary);
    color: var(--white);
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 700;
    z-index: 10000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--secondary);
    outline-offset: 2px;
}

body {
    /* Naver.com 스타일 폰트 스택 (시스템 폰트 우선) */
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Apple SD Gothic Neo",
        "Pretendard Variable",
        Pretendard,
        Roboto,
        "Noto Sans KR",
        "Segoe UI",
        "Malgun Gothic",
        "Apple Color Emoji",
        "Segoe UI Emoji",
        "Segoe UI Symbol",
        sans-serif;
    font-size: var(--font-base);        /* Mobile: 14px */
    line-height: var(--line-height-base);
    color: var(--text-dark);
    word-break: keep-all;               /* Korean optimization - 필수! */
    white-space: normal;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Tablet font size */
@media (min-width: 768px) {
    body {
        font-size: var(--font-base-tablet); /* 16px */
    }
}

/* Desktop font size */
@media (min-width: 1024px) {
    body {
        font-size: var(--font-base-desktop); /* 18px */
    }
}

/* Heading System - Naver.com Style (Compact & Professional) */
h1 {
    font-size: 1.125rem;            /* Mobile: 15px (Naver-like) */
    font-weight: 700;
    line-height: 1.3;
    word-break: keep-all;
}

@media (min-width: 768px) {
    h1 {
        font-size: 1.5rem;          /* Tablet: 21px */
    }
}

@media (min-width: 1024px) {
    h1 {
        font-size: 1.75rem;         /* Desktop: 24px */
    }
}

h2 {
    font-size: 1rem;                /* Mobile: 13px (Naver-like) */
    font-weight: 700;
    line-height: 1.4;
    word-break: keep-all;
}

@media (min-width: 768px) {
    h2 {
        font-size: 1.25rem;         /* Tablet: 17.5px */
    }
}

@media (min-width: 1024px) {
    h2 {
        font-size: 1.5rem;          /* Desktop: 22.5px */
    }
}

h3 {
    font-size: 0.9375rem;           /* Mobile: 12px (Naver-like) */
    font-weight: 700;
    line-height: 1.5;
    word-break: keep-all;
}

@media (min-width: 768px) {
    h3 {
        font-size: 1.0625rem;       /* Tablet: 15px */
    }
}

@media (min-width: 1024px) {
    h3 {
        font-size: 1.25rem;         /* Desktop: 17.5px */
    }
}

h4 {
    font-size: 0.875rem;            /* Mobile: 11.5px (Naver-like) */
    font-weight: 600;
    line-height: 1.5;
    word-break: keep-all;
}

@media (min-width: 768px) {
    h4 {
        font-size: 1rem;            /* Tablet: 14px */
    }
}

@media (min-width: 1024px) {
    h4 {
        font-size: 1.125rem;        /* Desktop: 15.75px */
    }
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s;
}

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

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

/* Container - Mobile First */
.container {
    max-width: 1280px;              /* 80rem */
    margin: 0 auto;
    padding: 0 1rem;                /* Mobile: 16px */
}

@media (min-width: 768px) {
    .container {
        padding: 0 1.5rem;          /* Tablet: 24px */
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 2rem;            /* Desktop: 32px */
    }
}

/* ===================================
   3. Header
   =================================== */
#header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1100; /* Consistent across desktop and mobile */
}

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

.logo a {
    display: flex;
    flex-direction: column;
    color: var(--primary);
    font-weight: 700;
    text-decoration: none;
}

.logo-text {
    font-size: 2rem;
    line-height: 1;
}

.logo-sub {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-gray);
    margin-top: 0.25rem;
}

.util-nav {
    display: flex;
    gap: 1rem;
}

.util-link {
    padding: 0.5rem 1rem;
    color: var(--text-gray);
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

/* ===================================
   4. GNB (Global Navigation Bar)
   =================================== */
/* Desktop GNB - Default visible */
#gnb {
    background: var(--primary);
    color: var(--white);
    position: static;           /* Desktop: normal flow */
    width: 100%;                /* Desktop: full width */
}

.gnb-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.gnb-menu > li {
    position: relative;
    flex: 1;
}

.gnb-menu > li > a {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--white);
    font-weight: 500;
    text-align: center;
    transition: background-color 0.3s;
}

.gnb-menu > li > a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Desktop: Show submenu on hover */
.gnb-menu > li:hover .gnb-sub {
    display: block;
}

/* GNB Submenu (2-depth) */
.gnb-sub {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(0, 74, 158, 0.95);
    list-style: none;
    display: none; /* Hidden by default, shown on hover */
    z-index: 999;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.gnb-sub li {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.gnb-sub li:first-child {
    border-top: none;
}

.gnb-sub li a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--white);
    font-size: 0.9rem;
    text-align: left;
    transition: background-color 0.3s, padding-left 0.3s;
}

.gnb-sub li a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    padding-left: 1.5rem;
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none; /* Hidden on desktop */
    flex-direction: column;
    justify-content: space-around;
    width: 44px; /* Minimum touch target size (WCAG 2.5.5) */
    height: 44px; /* Minimum touch target size (WCAG 2.5.5) */
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1150; /* Above header (1100) but below sticky CTA (2000) */
}

.mobile-menu-toggle span {
    width: 28px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ===================================
   5. Hero Section (Sub Visual)
   =================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(rgba(0, 74, 158, 0.6), rgba(0, 74, 158, 0.6)),
                url('../images/hero-bg-industrial.jpg') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-align: center;
    overflow: hidden;
}

/* Hero Video Background */
.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    z-index: 0;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 74, 158, 0.4);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

/* Hero heading - Larger than standard h2 for visual impact */
.hero h2 {
    font-size: 1.5rem;              /* Mobile: 24px */
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

@media (min-width: 768px) {
    .hero h2 {
        font-size: 2rem;            /* Tablet: 32px */
        margin-bottom: 1.25rem;
    }
}

@media (min-width: 1024px) {
    .hero h2 {
        font-size: 2.5rem;          /* Desktop: 40px */
        margin-bottom: 1.5rem;
    }
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

.scroll-down {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    letter-spacing: 2px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, -10px); }
}

/* ===================================
   6. Section Common Styles
   =================================== */
/* Section Padding - Naver.com Style (Ultra Compact) */
.section {
    padding: 1.5rem 0;              /* Mobile: 24px (Naver-like tight) */
}

@media (min-width: 768px) {
    .section {
        padding: 2.5rem 0;          /* Tablet: 40px */
    }
}

@media (min-width: 1024px) {
    .section {
        padding: 3rem 0;            /* Desktop: 48px */
    }
}

.section-gray {
    background: var(--bg-light-gray);
}

/* Section titles - Use h2 defaults with centered alignment */
.section-title {
    text-align: center;
    /* Font size inherited from h2: Mobile 18px → Tablet 24px → Desktop 30px */
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1.5rem;          /* Mobile: 24px */
}

@media (min-width: 768px) {
    .section-title {
        margin-bottom: 2rem;        /* Tablet: 32px */
    }
}

@media (min-width: 1024px) {
    .section-title {
        margin-bottom: 3rem;        /* Desktop: 48px */
    }
}

/* ===================================
   7. About Section
   =================================== */
/* Stats Grid - Naver.com Style (Ultra Compact) */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;                /* Mobile: 8px (Naver standard) */
    margin-bottom: 1rem;        /* Mobile: 16px */
}

@media (min-width: 768px) {
    .stats-grid {
        gap: 0.75rem;           /* Tablet: 12px */
        margin-bottom: 1.5rem;  /* Tablet: 24px */
    }
}

@media (min-width: 1024px) {
    .stats-grid {
        gap: 1rem;              /* Desktop: 16px */
        margin-bottom: 2rem;    /* Desktop: 32px */
    }
}

/* Stat Item - Naver.com Style (Ultra Compact) */
.stat-item {
    text-align: center;
    padding: 0.75rem 0.5rem;    /* Mobile: 12px 8px (Naver-like) */
    background: var(--white);
    border-radius: 4px;         /* Naver: minimal rounding */
    border: 1px solid #f0f0f0;  /* Naver: subtle border */
    box-shadow: none;           /* Naver: no shadow on mobile */
    transition: transform 0.3s, border-color 0.3s;
}

@media (min-width: 768px) {
    .stat-item {
        padding: 1rem 0.75rem;  /* Tablet: 16px 12px */
        box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    }
}

@media (min-width: 1024px) {
    .stat-item {
        padding: 1.5rem 1rem;   /* Desktop: 24px 16px */
        box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    }
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.stat-icon {
    color: var(--primary);
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-gray);
}

/* Info Grid - Naver.com Style */
.info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;                /* Mobile: 8px (Naver standard) */
}

@media (min-width: 768px) {
    .info-grid {
        gap: 0.75rem;           /* Tablet: 12px */
    }
}

@media (min-width: 1024px) {
    .info-grid {
        gap: 1rem;              /* Desktop: 16px */
    }
}

/* Info Card - Naver.com Style */
.info-card {
    padding: 0.75rem;           /* Mobile: 12px (Naver-like) */
    background: var(--white);
    border-radius: 4px;         /* Naver: minimal rounding */
    border: 1px solid #f0f0f0;  /* Naver: subtle border */
    box-shadow: none;           /* Naver: no shadow on mobile */
    transition: transform 0.3s, border-color 0.3s;
}

@media (min-width: 768px) {
    .info-card {
        padding: 1rem;          /* Tablet: 16px */
        box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    }
}

@media (min-width: 1024px) {
    .info-card {
        padding: 1.5rem;        /* Desktop: 24px */
        box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    }
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

/* Info Icon - Naver.com 기준 (일반 아이콘) */
.info-icon {
    color: var(--primary);
    font-size: 1rem;            /* 모바일: 16px */
    margin-bottom: 0.5rem;      /* 모바일: 8px */
}

@media (min-width: 768px) {
    .info-icon {
        font-size: 1.25rem;     /* 태블릿: 20px */
        margin-bottom: 0.75rem; /* 태블릿: 12px */
    }
}

@media (min-width: 1024px) {
    .info-icon {
        font-size: 1.5rem;      /* 데스크톱: 24px */
        margin-bottom: 1rem;    /* 데스크톱: 16px */
    }
}

.info-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.info-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===================================
   8. Best Products Section
   =================================== */
/* Best Products Grid - Naver.com Style */
.best-products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;                /* Mobile: 8px (Naver standard) */
}

@media (min-width: 768px) {
    .best-products-grid {
        gap: 0.75rem;           /* Tablet: 12px */
    }
}

@media (min-width: 1024px) {
    .best-products-grid {
        gap: 1rem;              /* Desktop: 16px */
    }
}

.product-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    border-color: var(--primary);
}

/* Product Image - Mobile First Padding & Height */
.product-image {
    background: var(--bg-light-gray);
    padding: 1.5rem 1rem;       /* Mobile: 24px 16px */
    text-align: center;
    color: var(--primary);
    height: 180px;              /* Mobile: 180px */
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

@media (min-width: 768px) {
    .product-image {
        padding: 2rem 1.5rem;   /* Tablet: 32px 24px */
        height: 240px;          /* Tablet: 240px */
    }
}

@media (min-width: 1024px) {
    .product-image {
        padding: 3rem 2rem;     /* Desktop: 48px 32px */
        height: 300px;          /* Desktop: 300px */
    }
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

/* Product Content - Naver.com Style */
.product-content {
    padding: 0.75rem;           /* Mobile: 12px (Naver-like) */
    position: relative;
}

@media (min-width: 768px) {
    .product-content {
        padding: 1rem;          /* Tablet: 16px */
    }
}

@media (min-width: 1024px) {
    .product-content {
        padding: 1.5rem;        /* Desktop: 24px */
    }
}

.product-badge {
    position: absolute;
    top: -1rem;
    right: 1rem;
    background: #ff6b6b;
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.product-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.product-card p {
    color: var(--text-gray);
    margin-bottom: 1rem;
}

.btn-link {
    color: var(--primary);
    font-weight: 600;
    transition: color 0.3s;
}

.btn-link:hover {
    color: var(--secondary);
}

/* ===================================
   9. Products Grid Section
   =================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.product-item {
    background: var(--white);
    padding: 2rem 1.5rem;
    text-align: center;
    border-radius: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
    color: var(--text-dark);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    cursor: pointer;
}

.product-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.product-item-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.product-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.product-item p {
    font-size: 0.9rem;
    color: var(--text-gray);
}

/* ===================================
   10. Business Fields Section
   =================================== */
/* Business Grid - Naver.com Style */
.business-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;                /* Mobile: 8px (Naver standard) */
}

@media (min-width: 768px) {
    .business-grid {
        gap: 0.75rem;           /* Tablet: 12px */
    }
}

@media (min-width: 1024px) {
    .business-grid {
        gap: 1rem;              /* Desktop: 16px */
    }
}

/* Business Card - Naver.com Style */
.business-card {
    background: var(--white);
    padding: 0.75rem 0.5rem;    /* Mobile: 12px 8px (Naver-like) */
    text-align: center;
    border-radius: 4px;         /* Naver: minimal rounding */
    border: 1px solid #f0f0f0;  /* Naver: subtle border */
    box-shadow: none;           /* Naver: no shadow on mobile */
    transition: transform 0.3s, border-color 0.3s;
}

@media (min-width: 768px) {
    .business-card {
        padding: 1rem 0.75rem;  /* Tablet: 16px 12px */
        box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    }
}

@media (min-width: 1024px) {
    .business-card {
        padding: 1.5rem 1rem;   /* Desktop: 24px 16px */
        box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    }
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-color: var(--primary);
}

/* Business Icon - Naver.com 기준 (일반 아이콘) */
.business-icon {
    font-size: 1rem;            /* 모바일: 16px */
    color: var(--primary);
    margin-bottom: 0.5rem;      /* 모바일: 8px */
}

@media (min-width: 768px) {
    .business-icon {
        font-size: 1.25rem;     /* 태블릿: 20px */
        margin-bottom: 0.75rem; /* 태블릿: 12px */
    }
}

@media (min-width: 1024px) {
    .business-icon {
        font-size: 1.5rem;      /* 데스크톱: 24px */
        margin-bottom: 1rem;    /* 데스크톱: 16px */
    }
}

.business-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.business-card p {
    font-size: 0.9rem;
    color: var(--text-gray);
}

/* ===================================
   11. CTA Section
   =================================== */
.section-cta {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
}

.cta-content {
    text-align: center;
    padding: 2rem 0;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

/* Button System - Mobile First (Guide Compliant) */
.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;      /* Mobile: 10px 20px */
    font-size: 0.875rem;            /* Mobile: 14px */
    font-weight: 700;
    border-radius: 0.5rem;          /* 8px */
    min-height: 44px;               /* Touch target area */
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    text-align: center;
    line-height: 1.5;
}

@media (min-width: 768px) {
    .btn {
        padding: 0.75rem 2rem;      /* Tablet: 12px 32px */
        font-size: 1rem;            /* Tablet: 16px */
    }
}

@media (min-width: 1024px) {
    .btn {
        padding: 1rem 2.5rem;       /* Desktop: 16px 40px */
        font-size: 1.125rem;        /* Desktop: 18px */
    }
}

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

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Focus state for accessibility */
.btn:focus-visible {
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
}

/* ===================================
   12. Footer
   =================================== */
#footer {
    background: var(--footer-bg);
    color: #cccccc;
    padding: 2rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-logo h2 {
    color: var(--white);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.footer-company {
    font-size: 0.9rem;
    color: #999;
}

.footer-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-section h3,
.footer-section h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-section p {
    font-size: 0.85rem;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.footer-section a {
    display: block;
    color: #cccccc;
    text-decoration: none;
    font-size: 0.85rem;
    line-height: 1.8;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 1rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
}

.copyright {
    font-size: 0.8rem;
    color: #999;
}

/* ===================================
   13. Responsive Design
   =================================== */

/* Tablet (768px - 1024px) - Grid layouts only, typography inherited */
@media (max-width: 1024px) {
    /* Typography is now controlled by mobile-first min-width queries */

    .stats-grid,
    .info-grid,
    .best-products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .business-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-info {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile (480px - 768px) */
@media (max-width: 768px) {
    /* Header - Mobile */
    #header {
        position: sticky;
        top: 0;
        z-index: 1100; /* Consistent with desktop */
        background: white;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }

    .header-inner {
        justify-content: space-between;
        align-items: center;
        padding: 0.75rem 0;
    }

    .logo {
        order: 1;
    }

    /* Show mobile menu toggle button */
    .mobile-menu-toggle {
        display: flex !important;
        order: 2;
        position: relative;
        z-index: 1150; /* Consistent with desktop */
    }

    .mobile-menu-toggle span {
        background: var(--primary);
    }

    .util-nav {
        display: none !important; /* Completely hide on mobile */
    }

    /* Mobile Navigation - Hidden by default */
    #gnb {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--primary);
        transition: right 0.3s ease;
        overflow-y: auto;
        z-index: 1000;
        box-shadow: -4px 0 12px rgba(0, 0, 0, 0.3);
    }

    #gnb.active {
        right: 0;
    }

    .gnb-menu {
        flex-direction: column;
        padding: 80px 0 20px 0;
    }

    .gnb-menu > li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .gnb-menu > li > a {
        text-align: left;
        padding: 1rem 1.5rem;
        font-size: 1.1rem;
    }

    /* Disable hover effect on mobile */
    .gnb-menu > li:hover .gnb-sub {
        display: none !important;
    }

    /* Mobile Submenu - Click to toggle */
    .gnb-sub {
        position: static;
        background: rgba(0, 50, 120, 0.5);
        display: none !important;
    }

    .gnb-menu > li.active .gnb-sub {
        display: block !important;
    }

    .gnb-sub li a {
        padding: 0.75rem 2rem;
        font-size: 0.95rem;
    }

    /* Mobile menu backdrop */
    #gnb.active::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 280px;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }

    /* Mobile-specific overrides removed - using mobile-first defaults */
    /* Typography sizes are now controlled by the mobile-first system above */

    /* Grid layouts become single column on mobile */

    .stats-grid,
    .info-grid,
    .best-products-grid,
    .products-grid,
    .business-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-info {
        grid-template-columns: 1fr;
    }
}

/* Small Mobile (< 480px) - Minimal overrides, using mobile-first defaults */
@media (max-width: 480px) {
    /* Most styles are now inherited from mobile-first defaults */
    /* Only add specific adjustments if absolutely necessary */
}

/* ========================================
   MOBILE RESPONSIVE FIXES (Critical)
   ======================================== */

/* Mobile Grid Layout - Force single column on small screens */
@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr !important;
        gap: 1rem;
    }
}

/* Tablet Grid Layout - 2 columns for larger grids */
@media (min-width: 769px) and (max-width: 1024px) {
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Kakao Map Mobile Height Fix - Prevent 100vh issues */
@media (max-width: 768px) {
    #map,
    #contact-map,
    .kakao-map-container {
        height: 350px !important;
        min-height: 280px;
        max-height: 400px;
    }
}

/* Mobile Menu Backdrop Fix - Ensure proper z-index */
.menu-backdrop {
    z-index: 998 !important;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
}

.menu-open .menu-backdrop {
    display: block;
}

/* Mobile Menu Transition Fix - Smooth slide-in animation */
.menu-open .side-menu {
    transition: left 0.3s ease-in-out;
    left: 0;
}

.side-menu {
    transition: left 0.3s ease-in-out;
}

/* ===================================
   Utility Classes
   =================================== */

/* Button Utilities */
.btn-white {
    background-color: var(--white);
    color: var(--primary);
    border: 2px solid var(--white);
}

.btn-white:hover {
    background-color: transparent;
    color: var(--white);
    border-color: var(--white);
}

/* Background Utilities */
.bg-primary {
    background-color: var(--primary) !important;
}

.bg-secondary {
    background-color: var(--secondary) !important;
}

.bg-gray {
    background-color: var(--bg-light-gray) !important;
}

.bg-light {
    background-color: var(--white) !important;
}

/* Text Color Utilities */
.text-white {
    color: var(--white) !important;
}

.text-primary {
    color: var(--primary) !important;
}

.text-muted {
    color: var(--text-gray) !important;
}

/* Typography Utilities */
.text-large {
    font-size: 1.125rem;
}

.text-small {
    font-size: 0.875rem;
}

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

.font-bold {
    font-weight: 700;
}

/* Spacing Utilities */
/* Margin Utilities - Mobile First (Guide Compliant) */
.mb-1 {
    margin-bottom: 0.5rem !important;   /* Mobile: 8px */
}

@media (min-width: 768px) {
    .mb-1 {
        margin-bottom: 0.75rem !important;  /* Tablet: 12px */
    }
}

@media (min-width: 1024px) {
    .mb-1 {
        margin-bottom: 1rem !important;     /* Desktop: 16px */
    }
}

.mb-2 {
    margin-bottom: 1rem !important;     /* Mobile: 16px */
}

@media (min-width: 768px) {
    .mb-2 {
        margin-bottom: 1.5rem !important;   /* Tablet: 24px */
    }
}

@media (min-width: 1024px) {
    .mb-2 {
        margin-bottom: 2rem !important;     /* Desktop: 32px */
    }
}

.mb-3 {
    margin-bottom: 1.5rem !important;   /* Mobile: 24px */
}

@media (min-width: 768px) {
    .mb-3 {
        margin-bottom: 2rem !important;     /* Tablet: 32px */
    }
}

@media (min-width: 1024px) {
    .mb-3 {
        margin-bottom: 3rem !important;     /* Desktop: 48px */
    }
}

.mt-1 {
    margin-top: 1rem !important;
}

.mt-2 {
    margin-top: 2rem !important;
}

.mt-3 {
    margin-top: 3rem !important;
}

/* Card Border Color Utilities */
.card-blue {
    border-top: 4px solid #06b6d4;
}

.card-red {
    border-top: 4px solid #dc2626;
}

.card-purple {
    border-top: 4px solid #7c3aed;
}

.card-green {
    border-top: 4px solid #10b981;
}

.card-amber {
    border-top: 4px solid #f59e0b;
}

/* ===================================
   Sub-Visual Section (Page Headers)
   =================================== */
.sub-visual {
    background: linear-gradient(135deg, var(--primary) 0%, #003d82 100%);
    color: var(--white);
    padding: 4rem 0 3rem;
    position: relative;
    overflow: hidden;
}

.sub-visual::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="2" height="2" fill="rgba(255,255,255,0.05)"/></svg>');
    background-size: 50px 50px;
    opacity: 0.3;
}

.sub-visual .container {
    position: relative;
    z-index: 1;
}

.sub-visual h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--white);
}

.sub-visual p {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 800px;
}

/* Breadcrumb - General (works in any section) */
.breadcrumb {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.breadcrumb a {
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.breadcrumb a:hover {
    transform: translateX(-2px);
}

.breadcrumb span {
    user-select: none;
}

/* Breadcrumb separator styling */
.breadcrumb > span:not(:last-child) {
    opacity: 0.6;
    font-weight: 300;
}

/* Breadcrumb in sub-visual (white text on dark background) */
.sub-visual .breadcrumb {
    opacity: 0.9;
}

.sub-visual .breadcrumb a {
    color: var(--white);
}

.sub-visual .breadcrumb a:hover {
    opacity: 0.8;
}

.sub-visual .breadcrumb span {
    color: var(--white);
}

/* Breadcrumb in regular sections (dark text on light background) */
.section .breadcrumb a {
    color: var(--primary);
}

.section .breadcrumb a:hover {
    color: var(--secondary);
}

.section .breadcrumb span {
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .sub-visual {
        padding: 3rem 0 2rem;
    }

    .sub-visual h1 {
        font-size: 2rem;
    }

    .sub-visual p {
        font-size: 1rem;
    }
}

/* ===================================
   ADVANCED DESIGN ENHANCEMENTS
   =================================== */

/* Asymmetric Layouts */
.layout-asymmetric {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.layout-asymmetric-reverse {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
    align-items: center;
}

.layout-offset {
    position: relative;
    padding-left: 3rem;
}

.layout-offset::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

/* Advanced Card Styles */
.card-elevated {
    box-shadow: 0 2px 8px rgba(0, 74, 158, 0.08);
    transition: all 0.3s ease;
}

.card-elevated:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 74, 158, 0.12);
}

.card-gradient {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border: 1px solid rgba(0, 74, 158, 0.1);
}

.card-gradient:hover {
    background: linear-gradient(135deg, #ffffff 0%, #e8f0fe 100%);
    border-color: rgba(0, 74, 158, 0.2);
}

.card-featured {
    position: relative;
    overflow: hidden;
}

.card-featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary);
}

/* Typography Variations */
.heading-large {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--primary);
}

@media (min-width: 768px) {
    .heading-large {
        font-size: 2.5rem;
    }
}

@media (min-width: 1024px) {
    .heading-large {
        font-size: 3rem;
    }
}

.heading-accent {
    position: relative;
    padding-left: 2rem;
}

.heading-accent::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 60%;
    background: var(--primary);
    border-radius: 3px;
}

.text-left-aligned {
    text-align: left !important;
}

.heading-underline {
    position: relative;
    display: inline-block;
    padding-bottom: 1rem;
}

.heading-underline::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

/* Background Patterns */
.bg-pattern-dots {
    background-image: radial-gradient(circle, rgba(0, 74, 158, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
}

.bg-pattern-grid {
    background-image:
        linear-gradient(rgba(0, 74, 158, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 74, 158, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.bg-gradient-soft {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f0f4f8 100%);
}

.bg-wave {
    position: relative;
    overflow: hidden;
}

.bg-wave::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 100"><path d="M0,50 Q300,80 600,50 T1200,50 L1200,100 L0,100 Z" fill="rgba(0,74,158,0.03)"/></svg>');
    background-size: cover;
}

/* Decorative Elements */
.decorative-circle {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 170, 255, 0.1), transparent 70%);
    z-index: 0;
    pointer-events: none;
}

.decorative-circle-1 {
    top: -200px;
    right: -200px;
}

.decorative-circle-2 {
    bottom: -200px;
    left: -200px;
}

/* Image Overlays and Effects */
.image-frame {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.image-frame::after {
    content: '';
    position: absolute;
    inset: 0;
    border: 3px solid rgba(255, 255, 255, 0.5);
    border-radius: 16px;
    pointer-events: none;
}

.image-rounded {
    border-radius: 20px;
    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(0, 74, 158, 0.05);
}

/* Hover Animations */
.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 74, 158, 0.15);
}

.hover-glow {
    transition: box-shadow 0.3s ease;
}

.hover-glow:hover {
    box-shadow: 0 0 30px rgba(0, 170, 255, 0.3);
}

/* Icon Enhancements */
.icon-container-gradient {
    /* Naver.com 기준: 큰 아이콘 */
    background: var(--primary);
    color: white;
    width: 48px;                    /* 모바일: 48px */
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;             /* 아이콘 크기 조정 */
    box-shadow: 0 2px 8px rgba(0, 74, 158, 0.15);
    transition: all 0.2s ease;
}

@media (min-width: 768px) {
    .icon-container-gradient {
        width: 64px;                /* 태블릿: 64px */
        height: 64px;
        font-size: 1.75rem;
    }
}

.icon-container-gradient:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 74, 158, 0.2);
}

.icon-circle-soft {
    background: rgba(0, 74, 158, 0.08);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary);
    transition: all 0.3s ease;
}

.icon-circle-soft:hover {
    background: var(--primary);
    color: white;
    box-shadow: 0 8px 24px rgba(0, 74, 158, 0.25);
}

/* Section Variations */
.section-padded-large {
    padding: 6rem 0;
}

.section-padded-small {
    padding: 3rem 0;
}

.section-overlap {
    position: relative;
    margin-top: -80px;
    z-index: 10;
}

/* Stats Counter */
.stat-number-large {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

/* Timeline Styles */
.timeline-item {
    position: relative;
    padding-left: 3rem;
    padding-bottom: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 9px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), transparent);
}

.timeline-dot {
    position: absolute;
    left: 0;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    border: 4px solid white;
    box-shadow: 0 0 0 2px var(--primary);
}

/* Brand Color Gradients */
.gradient-walchem {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.gradient-iwaki {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.gradient-orion {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.gradient-wilo {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .layout-asymmetric,
    .layout-asymmetric-reverse {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .heading-large {
        font-size: 2rem;
    }

    .stat-number-large {
        font-size: 2.5rem;
    }

    .decorative-circle {
        width: 200px;
        height: 200px;
    }

    .section-padded-large {
        padding: 4rem 0;
    }
}

/* ========================================
   2025 DESIGN IMPROVEMENTS
   ======================================== */

/* ========================================
   HERO SECTION ENHANCEMENTS
   ======================================== */

.hero-title-gradient {
    font-size: 2.25rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

@media (min-width: 768px) {
    .hero-title-gradient {
        font-size: 2.75rem;
    }
}

@media (min-width: 1024px) {
    .hero-title-gradient {
        font-size: 3rem;
    }
}

.hero-title-gradient .highlight {
    color: #00aaff;
}

.hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    line-height: 1.6;
}

@media (min-width: 768px) {
    .hero-subtitle {
        font-size: 1.125rem;
    }
}

@media (min-width: 1024px) {
    .hero-subtitle {
        font-size: 1.25rem;
    }
}

.hero-cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.btn-large {
    /* Naver.com 기준: 주요 CTA 버튼과 동일한 크기 */
    padding: 0.625rem 1.25rem;      /* 모바일: 10px 20px */
    font-size: 0.875rem;            /* 모바일: 14px */
    font-weight: 700;
    border-radius: 8px;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    min-height: 44px;               /* WCAG 터치 영역 */
}

@media (min-width: 768px) {
    .btn-large {
        padding: 0.75rem 2rem;      /* 태블릿: 12px 32px */
        font-size: 1rem;            /* 태블릿: 16px */
    }
}

@media (min-width: 1024px) {
    .btn-large {
        padding: 1rem 2.5rem;       /* 데스크톱: 16px 40px */
        font-size: 1.125rem;        /* 데스크톱: 18px */
    }
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 74, 158, 0.3);
    background: #003d82;
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.95);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
}

.scroll-animated {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* ========================================
   TRUST SIGNALS SECTION
   ======================================== */

.bg-gradient-subtle {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

.gradient-text {
    color: var(--primary);
    font-size: 1.75rem;
    font-weight: 700;
}

@media (min-width: 768px) {
    .gradient-text {
        font-size: 2rem;
    }
}

@media (min-width: 1024px) {
    .gradient-text {
        font-size: 2.25rem;
    }
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: #666;
    margin-bottom: 3rem;
}

.client-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    flex-wrap: wrap;
    margin-bottom: 4rem;
    padding: 2rem 0;
}

.client-logo-item {
    flex: 0 1 auto;
}

.client-logo-placeholder {
    width: 150px;
    height: 100px;
    background: white;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.client-logo-placeholder:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.client-logo-placeholder i {
    font-size: 2.5rem;
    color: #004a9e;
    margin-bottom: 0.5rem;
}

.client-logo-placeholder p {
    font-size: 0.875rem;
    color: #666;
    font-weight: 600;
    margin: 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.testimonial-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.testimonial-stars {
    color: #fbbf24;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.testimonial-text {
    color: #333;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    border-top: 1px solid #eee;
    padding-top: 1rem;
}

.testimonial-author strong {
    color: #004a9e;
    margin-bottom: 0.25rem;
}

.testimonial-author span {
    color: #999;
    font-size: 0.875rem;
}

.stats-bar {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: linear-gradient(135deg, #004a9e 0%, #00aaff 100%);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    color: white;
    flex-wrap: wrap;
    gap: 2rem;
}

.stat-item-inline {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    font-size: 2.5rem;
    opacity: 0.9;
}

.stat-info {
    text-align: left;
}

.stat-number-animated {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-label-small {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* ========================================
   BEST PRODUCTS - ASYMMETRIC LAYOUT
   ======================================== */

.best-products-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 1.5rem;
}

.product-card:first-child {
    grid-row: 1 / 3;
    display: flex;
    flex-direction: column;
}

.product-card:first-child .product-image {
    height: 400px;
}

.product-card:not(:first-child) .product-image {
    height: 180px;
}

.product-card {
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.product-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.product-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: #ea580c;
    color: white;
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(234, 88, 12, 0.3);
    z-index: 10;
}

/* ========================================
   STICKY CTA BUTTON
   ======================================== */

.sticky-cta {
    position: fixed;
    bottom: 40px; /* Increased for better spacing */
    right: 30px;
    z-index: 2000; /* Highest interactive element - always accessible */
    pointer-events: auto; /* Ensure always clickable */
}

.sticky-cta-button {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--primary);
    color: white;
    padding: 0.875rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    box-shadow: 0 4px 16px rgba(0, 74, 158, 0.3);
    transition: all 0.3s ease;
    min-width: 44px; /* Minimum touch target */
    min-height: 44px; /* Minimum touch target */
    pointer-events: auto;
}

.sticky-cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 74, 158, 0.4);
    background: #003d82;
}

/* ========================================
   CONTAINER WIDTH INCREASE
   ======================================== */

.container {
    max-width: 1280px;
}

/* ========================================
   MOBILE RESPONSIVE
   ======================================== */

@media (max-width: 768px) {
    /* Hero Section */
    .hero-title-gradient {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-large {
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    /* Trust Signals */
    .gradient-text {
        font-size: 1.75rem;
    }

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

    .stats-bar {
        flex-direction: column;
        padding: 2rem 1.5rem;
    }

    .stat-item-inline {
        width: 100%;
        justify-content: center;
    }

    .client-logos {
        gap: 1.5rem;
    }

    .client-logo-placeholder {
        width: 120px;
        height: 80px;
    }

    /* Best Products */
    .best-products-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .product-card:first-child {
        grid-row: auto;
    }

    .product-card:first-child .product-image,
    .product-card:not(:first-child) .product-image {
        height: 250px;
    }

    /* Sticky CTA - Mobile safe positioning */
    .sticky-cta {
        bottom: 80px; /* Moved up to avoid overlap with other elements */
        right: 15px;
        z-index: 2000 !important; /* Highest - always accessible */
    }

    .sticky-cta-button {
        width: 56px;
        height: 56px;
        border-radius: 50%;
        justify-content: center;
        padding: 0;
        box-shadow: 0 6px 20px rgba(0, 74, 158, 0.5);
        animation: none; /* Disable float animation on mobile */
    }

    .sticky-cta-button span {
        display: none;
    }

    .sticky-cta-button i {
        font-size: 1.5rem;
    }

    /* Back to top button positioning (if exists) */
    #back-to-top {
        bottom: 15px !important; /* Below CTA button (80px) */
        right: 15px !important;
        width: 48px;
        height: 48px;
        z-index: 1500 !important; /* Below CTA (2000) but above menu (1150) */
    }
}

/* ========================================
   MICRO-INTERACTIONS
   ======================================== */

/* Button Ripple Effect */
.btn, .btn-primary, .btn-secondary, .btn-large {
    position: relative;
    overflow: hidden;
}

.btn::before, .btn-primary::before, .btn-secondary::before, .btn-large::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before, .btn-primary:active::before,
.btn-secondary:active::before, .btn-large:active::before {
    width: 300px;
    height: 300px;
}

/* Link Underline Animation */
.nav-link, .footer a {
    position: relative;
    display: inline-block;
}

.nav-link::after, .footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary);
    transition: width var(--transition-base) var(--ease-in-out-smooth);
}

.nav-link:hover::after, .footer a:hover::after {
    width: 100%;
}

/* Card Glow Effect on Hover */
.product-card::after, .testimonial-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 12px;
    opacity: 0;
    background: radial-gradient(
        circle at center,
        rgba(0, 170, 255, 0.15) 0%,
        transparent 70%
    );
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.product-card:hover::after, .testimonial-card:hover::after {
    opacity: 1;
}

/* Input Focus Glow */
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(0, 170, 255, 0.1),
                0 0 20px rgba(0, 170, 255, 0.2);
    transition: all var(--transition-base) var(--ease-in-out-smooth);
}

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
}

/* Section Fade-In Animation */
.section {
    animation: fadeInUp 0.8s var(--ease-in-out-smooth);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   DARK MODE SECTION
   ======================================== */

.section-dark {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    position: relative;
    overflow: hidden;
}

.section-dark::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(0, 170, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 74, 158, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.section-dark .container {
    position: relative;
    z-index: 1;
}

.card-dark {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 2rem;
    transition: all var(--transition-base) var(--ease-in-out-smooth);
}

.card-dark:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(0, 170, 255, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3),
                0 0 20px rgba(0, 170, 255, 0.2);
}

.card-dark h3 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.card-dark p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin: 0;
}

.icon-circle-dark {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #004a9e, #00aaff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    box-shadow: 0 8px 20px rgba(0, 74, 158, 0.4);
}

.layout-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

@media (max-width: 768px) {
    .layout-split {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* ========================================
   BRAND LOGOS IN PRODUCT CARDS
   ======================================== */

.brand-logo-container {
    position: absolute;
    top: 1rem;
    left: 1rem;
    z-index: 10;
    background: rgba(255, 255, 255, 0.95);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.brand-logo-container:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.brand-logo {
    height: 30px;
    width: auto;
    max-width: 120px;
    object-fit: contain;
    transition: transform var(--transition-base);
    display: block;
}

.product-card:hover .brand-logo {
    transform: scale(1.05);
}

/* Product Features List */
.product-features {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.product-features li {
    padding: 0.5rem 0;
    color: var(--text-gray);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.product-features li i {
    color: var(--secondary);
    font-size: 1rem;
}

.product-description {
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

/* ========================================
   MOBILE RESPONSIVE FOR LOGOS
   ======================================== */

@media (max-width: 768px) {
    .brand-logo-container {
        top: 0.5rem;
        left: 0.5rem;
        padding: 0.25rem 0.5rem;
    }

    .brand-logo {
        height: 20px;
        max-width: 80px;
    }
}

/* ========================================
   CONTACT PAGE STYLES
   ======================================== */

/* Contact Cards with 3D Effect */
.contact-card {
    background: white;
    border-radius: 16px;
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all var(--transition-slow) var(--ease-in-out-smooth);
    transform-style: preserve-3d;
    perspective: 1000px;
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #004a9e, #00aaff);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.contact-card:hover::before {
    transform: scaleX(1);
}

.contact-card:hover {
    transform: translateY(-10px) rotateX(3deg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.contact-card-featured {
    border: 2px solid #ea580c;
    position: relative;
}

.contact-card-badge-top {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(135deg, #ea580c, #dc2626);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 8px rgba(234, 88, 12, 0.3);
}

.contact-card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, #004a9e, #00aaff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    box-shadow: 0 8px 20px rgba(0, 74, 158, 0.3);
    transition: transform var(--transition-base);
}

.contact-card:hover .contact-card-icon {
    transform: scale(1.1) rotate(5deg);
}

.contact-card h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.contact-card-content {
    margin: 1.5rem 0;
}

.contact-link {
    display: block;
    padding: 0.75rem;
    color: var(--text-dark);
    font-size: 1.05rem;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-base);
    border-radius: 8px;
}

.contact-link:hover {
    background: var(--bg-light-gray);
    color: var(--primary);
    transform: translateX(5px);
}

.contact-link i {
    color: var(--secondary);
    margin-right: 0.5rem;
}

.contact-card-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #004a9e, #00aaff);
    color: white;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

/* Contact Form */
.contact-form {
    background: white;
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group label i {
    color: var(--secondary);
    margin-right: 0.5rem;
}

.required {
    color: #dc2626;
    margin-left: 0.25rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Noto Sans KR', sans-serif;
    transition: all var(--transition-base);
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(0, 170, 255, 0.1),
                0 0 20px rgba(0, 170, 255, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-right: 0.75rem;
    margin-top: 0.25rem;
    cursor: pointer;
}

.checkbox-label span {
    color: var(--text-dark);
    font-size: 0.95rem;
}

/* FAQ Section */
.faq-item {
    background: white;
    border-radius: 12px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.faq-question {
    display: flex;
    align-items: center;
    padding: 1.5rem 2rem;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition-base);
}

.faq-question:hover {
    background: var(--bg-light-gray);
}

.faq-question > i:first-child {
    color: var(--primary);
    font-size: 1.5rem;
    margin-right: 1rem;
    flex-shrink: 0;
}

.faq-question span {
    flex: 1;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
}

.faq-toggle {
    color: var(--text-gray);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-in-out-smooth),
                padding 0.4s var(--ease-in-out-smooth);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 2rem 1.5rem;
}

.faq-answer p {
    color: var(--text-gray);
    line-height: 1.8;
    margin: 0;
}

/* Location Info Card */
.location-info-card {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    max-width: 1000px;
    margin: 0 auto;
}

.location-info-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #10b981, #059669);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
}

.location-info-content {
    flex: 1;
}

.location-info-content h4 {
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.location-info-content p {
    color: var(--text-dark);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.location-transport {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--bg-light-gray);
    border-radius: 12px;
}

.location-transport > div {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

.location-transport i {
    color: var(--secondary);
    font-size: 1.25rem;
    margin-top: 0.125rem;
    flex-shrink: 0;
}

/* Mobile Responsive for Contact Page */
@media (max-width: 768px) {
    .contact-form {
        padding: 2rem 1.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .faq-question {
        padding: 1rem 1.5rem;
    }

    .faq-question span {
        font-size: 1rem;
    }

    .faq-item.active .faq-answer {
        padding: 0 1.5rem 1rem;
    }

    .location-info-card {
        flex-direction: column;
        padding: 2rem 1.5rem;
    }

    .location-info-icon {
        margin: 0 auto;
    }

    .location-info-content {
        text-center;
    }

    .location-transport {
        padding: 1rem;
    }

    .location-transport > div {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* ==========================================
   Best Products Grid - 3 Column Layout
   ========================================== */
.best-products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

/* Tablet: 2 columns */
@media (max-width: 1024px) {
    .best-products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

/* Mobile: 1 column */
@media (max-width: 768px) {
    .best-products-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Brand Logo Container - Uniform Size */
.brand-logo-container {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.brand-logo-container img {
    max-width: 180px;
    max-height: 60px;
    width: auto;
    height: auto;
    object-fit: contain;
}