/* ===== Design Tokens ===== */
:root {
    /* Colors - Brand */
    --color-primary: #1a5276;
    --color-primary-light: #2980b9;
    --color-primary-bg: #f0f7fc;
    --color-primary-15: rgba(26,82,118,0.15);
    --color-dark: #2c3e50;
    --color-success: #27ae60;
    --color-info: #3498db;

    /* Colors - Text (WCAG AA compliant) */
    --text-primary: #333;
    --text-secondary: #555;
    --text-muted: #666;
    --text-hint: #767676;

    /* Colors - Background & Border */
    --bg-white: #fff;
    --bg-gray: #f8f9fa;
    --bg-dark: #2c3e50;
    --border-color: #e0e0e0;
    --border-light: #eee;
    --border-dashed: #eee;

    /* Typography */
    --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --text-xs: 12px;
    --text-sm: 13px;
    --text-base: 14px;
    --text-md: 15px;
    --text-lg: 16px;
    --text-xl: 18px;
    --text-2xl: 24px;
    --text-3xl: 32px;
    --text-4xl: 48px;

    /* Spacing (8px base) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.25);
    --shadow-hover: 0 8px 25px rgba(0,0,0,0.3);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 14px;
    --radius-full: 50%;
    --radius-pill: 20px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-family); font-size: var(--text-md); line-height: 1.6; color: var(--text-primary); background: var(--bg-white); }
a { text-decoration: none; color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-5); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ===== Top Bar ===== */
.top-bar { background: var(--bg-dark); color: #fff; font-size: var(--text-sm); padding: var(--space-2) 0; }
.top-bar .container { display: flex; justify-content: flex-end; align-items: center; }
.top-bar-right { display: flex; align-items: center; flex-wrap: wrap; }
.top-bar-right a, .top-bar-right span { min-height: 44px; display: inline-flex; align-items: center; }
.top-bar-right a { color: #ccc; margin-left: var(--space-4); transition: color var(--transition-base); }
.top-bar-right a:hover { color: #fff; }
.top-bar-separator { margin: 0 var(--space-2); opacity: 0.4; }
.top-bar-right .lang-active { color: #fff; font-weight: 600; }
.top-bar-right i { margin-right: var(--space-1); }

/* ===== Header ===== */
.header { background: var(--bg-white); box-shadow: var(--shadow-sm); position: sticky; top: 0; z-index: 1000; }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 80px; }
.logo a { display: flex; align-items: center; }
.logo-img { height: 40px; width: auto; }

/* ===== Mobile Nav Toggle ===== */
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: var(--space-2); min-width: 44px; min-height: 44px; justify-content: center; align-items: center; }
.nav-toggle-bar { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all var(--transition-base); }
.nav-toggle.active .nav-toggle-bar:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.active .nav-toggle-bar:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Navigation ===== */
.nav-menu { display: flex; align-items: center; }
.nav-item { position: relative; }
.nav-item > a { display: block; padding: 28px 25px; font-weight: 500; font-size: var(--text-lg); color: var(--text-primary); transition: color var(--transition-base); }
.nav-item > a:hover, .nav-item.active > a { color: var(--color-primary); }
.nav-item.active > a { font-weight: 700; }
.sub-menu { display: none; position: absolute; top: 100%; left: 0; min-width: 200px; background: var(--bg-white); box-shadow: 0 5px 15px rgba(0,0,0,0.15); z-index: 100; border-top: 3px solid var(--color-primary); }
.nav-item:hover > .sub-menu, .nav-item:focus-within > .sub-menu { display: block; }
.sub-menu li a { display: block; padding: var(--space-3) var(--space-5); font-size: var(--text-base); color: var(--text-secondary); transition: background var(--transition-base), color var(--transition-base), padding var(--transition-base); border-bottom: 1px solid #f0f0f0; min-height: 44px; display: flex; align-items: center; }
.sub-menu li a:hover { background: var(--bg-gray); color: var(--color-primary); padding-left: 25px; }
.sub-menu .has-sub { position: relative; }
.sub-menu .has-sub > .sub-menu { top: 0; left: 100%; border-top: 3px solid var(--color-primary); }
.sub-menu .has-sub:hover > .sub-menu, .sub-menu .has-sub:focus-within > .sub-menu { display: block; }

/* ===== Page Header ===== */
.page-header { background: linear-gradient(135deg, rgba(26,82,118,0.93), rgba(41,128,185,0.9)), url('../images/page-header-bg.jpg') center/cover no-repeat; color: #fff; padding: var(--space-16) 0; text-align: center; }
.page-header h2 { font-size: clamp(24px, 4vw, 36px); font-weight: 700; margin-bottom: var(--space-2); letter-spacing: 1px; }
.page-header p { font-size: var(--text-lg); opacity: 0.9; }

/* ===== Page Content ===== */
.page-content { padding: var(--space-16) 0; }
.page-layout { display: flex; gap: var(--space-10); }

/* ===== Sidebar ===== */
.sidebar { width: 250px; flex-shrink: 0; }
.sidebar-title { background: var(--color-primary); color: #fff; padding: var(--space-4) var(--space-5); font-size: var(--text-xl); font-weight: 700; }
.sidebar-menu { border: 1px solid var(--border-color); border-top: none; }
.sidebar-menu li a { display: block; padding: var(--space-3) var(--space-5); font-size: var(--text-base); color: var(--text-secondary); border-bottom: 1px solid var(--border-color); transition: background var(--transition-base), color var(--transition-base), padding var(--transition-base); min-height: 44px; display: flex; align-items: center; }
.sidebar-menu li:last-child a { border-bottom: none; }
.sidebar-menu li a:hover, .sidebar-menu li.active a { background: var(--color-primary-bg); color: var(--color-primary); font-weight: 500; padding-left: 25px; }
.sidebar-menu li.active a { border-left: 4px solid var(--color-primary); font-weight: 700; }

/* ===== Content Area ===== */
.content { flex: 1; min-width: 0; }
.content-header { border-bottom: 2px solid var(--color-primary); padding-bottom: var(--space-4); margin-bottom: var(--space-8); }
.content-header h3 { font-size: var(--text-2xl); font-weight: 700; color: var(--color-primary); }
.content-body h4 { font-size: 20px; font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-3); }
.content-body p { line-height: 1.8; color: var(--text-secondary); margin-bottom: var(--space-5); }

/* ===== Content Images ===== */
.content-img { width: 100%; height: 280px; object-fit: cover; border-radius: var(--radius-lg); margin-bottom: var(--space-8); box-shadow: var(--shadow-md); }
.about-img { width: 100%; height: 220px; object-fit: cover; border-radius: var(--radius-lg); margin: var(--space-5) 0; box-shadow: var(--shadow-sm); }

/* ===== Info Block (shared: business-intro, rfid-intro, solution-intro) ===== */
.business-intro, .rfid-intro, .solution-intro { margin-bottom: var(--space-10); padding: var(--space-8); background: var(--bg-gray); border-radius: var(--radius-md); border-left: 4px solid var(--color-primary); }
.business-intro h4, .rfid-intro h4, .solution-intro h4 { color: var(--color-primary); margin-bottom: var(--space-4); }

/* ===== Business Page ===== */
.business-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.business-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: var(--space-8) var(--space-5); text-align: center; transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base); cursor: pointer; }
.business-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.business-card-icon { width: 80px; height: 80px; margin: 0 auto var(--space-5); background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; }
.business-card-icon i { font-size: 32px; color: #fff; }
.business-card h5 { font-size: 17px; font-weight: 700; color: var(--color-dark); }

/* ===== RFID Page ===== */
.rfid-subtitle, .solution-subtitle { font-size: var(--text-md); color: var(--text-muted) !important; font-style: italic; margin-bottom: var(--space-4) !important; }
.rfid-principle { margin-bottom: var(--space-10); }
.rfid-principle h4 { margin-bottom: var(--space-6); padding-bottom: var(--space-2); border-bottom: 1px solid var(--border-color); }
.rfid-items { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.rfid-item { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: var(--space-8) var(--space-5); text-align: center; transition: transform var(--transition-base), box-shadow var(--transition-base); }
.rfid-item:hover { box-shadow: var(--shadow-md); transform: translateY(-5px); }
.rfid-item-icon { width: 70px; height: 70px; margin: 0 auto var(--space-4); background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; }
.rfid-item-icon i { font-size: 28px; color: #fff; }
.rfid-item h5 { font-size: var(--text-xl); font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-2); }
.rfid-item p { font-size: var(--text-base); color: var(--text-muted); }
.rfid-advantages { margin-top: var(--space-8); }
.rfid-advantages h4 { margin-bottom: var(--space-4); padding-bottom: var(--space-2); border-bottom: 1px solid var(--border-color); }
.advantage-list li { padding: var(--space-2) 0; font-size: var(--text-md); color: var(--text-secondary); }
.advantage-list li i { color: var(--color-success); margin-right: var(--space-2); }

/* ===== Solution Pages ===== */
.solution-benefits { margin-top: var(--space-8); }
.solution-benefits h4 { margin-bottom: var(--space-5); padding-bottom: var(--space-2); border-bottom: 1px solid var(--border-color); }
.benefit-list li { padding: var(--space-3) 0; font-size: var(--text-md); color: var(--text-secondary); border-bottom: 1px dashed var(--border-dashed); }
.benefit-list li:last-child { border-bottom: none; }
.benefit-list li i { color: var(--color-success); margin-right: var(--space-2); }

/* ===== Hero Section (Index) ===== */
.hero { position: relative; color: #fff; padding: 0; min-height: 100vh; display: flex; align-items: center; overflow: hidden; background: #0a1628; }
#heroCanvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; }
.hero-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 2; background: linear-gradient(135deg, rgba(10,22,40,0.7) 0%, rgba(26,82,118,0.5) 50%, rgba(41,128,185,0.4) 100%); }
.hero-content { position: relative; z-index: 3; padding: 100px 0 var(--space-20); }
.hero-badge { display: inline-block; padding: var(--space-1) var(--space-4); border: 1px solid rgba(255,255,255,0.3); border-radius: var(--radius-pill); font-size: var(--text-sm); font-weight: 500; letter-spacing: 2px; text-transform: uppercase; margin-bottom: var(--space-6); animation: fadeInDown 0.8s ease; backdrop-filter: blur(4px); background: rgba(255,255,255,0.08); }
.hero h1 { font-size: clamp(28px, 5vw, 48px); font-weight: 900; margin-bottom: var(--space-5); line-height: 1.3; animation: fadeInUp 0.8s ease 0.2s both; }
.hero p { font-size: var(--text-xl); opacity: 0.85; margin-bottom: var(--space-8); line-height: 1.8; animation: fadeInUp 0.8s ease 0.4s both; }
.hero-buttons { display: flex; gap: var(--space-4); flex-wrap: wrap; animation: fadeInUp 0.8s ease 0.6s both; }
.hero .btn { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-4) var(--space-8); background: #fff; color: var(--color-primary); font-size: var(--text-md); font-weight: 700; border-radius: var(--radius-md); transition: background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base); }
.hero .btn:hover { background: var(--color-primary-bg); transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.hero .btn-outline-hero { background: transparent; border: 2px solid rgba(255,255,255,0.4); color: #fff; }
.hero .btn-outline-hero:hover { background: rgba(255,255,255,0.1); border-color: #fff; transform: translateY(-3px); box-shadow: 0 8px 25px rgba(0,0,0,0.2); }
.hero-scroll { position: absolute; bottom: var(--space-8); left: 50%; transform: translateX(-50%); z-index: 3; text-align: center; animation: fadeInUp 1s ease 1s both; }
.hero-scroll span { display: block; font-size: 11px; letter-spacing: 3px; opacity: 0.5; margin-bottom: var(--space-2); }
.hero-scroll-line { width: 1px; height: 40px; background: rgba(255,255,255,0.3); margin: 0 auto; position: relative; overflow: hidden; }
.hero-scroll-line::after { content: ''; position: absolute; top: -100%; left: 0; width: 100%; height: 100%; background: #fff; animation: scrollLine 1.5s ease infinite; }
@keyframes scrollLine { 0% { top: -100%; } 100% { top: 100%; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) {
    .hero h1, .hero p, .hero-buttons, .hero-badge, .hero-scroll { animation: none; }
    .hero-scroll-line::after { animation: none; }
}

/* ===== Section Common ===== */
.section { padding: var(--space-20) 0; }
.section-gray { background: var(--bg-gray); }
.section-header { text-align: center; margin-bottom: var(--space-12); }
.section-header h2 { font-size: clamp(24px, 3.5vw, 32px); font-weight: 800; color: var(--color-primary); margin-bottom: var(--space-3); }
.section-header .bar { width: 50px; height: 3px; background: var(--color-primary); margin: 0 auto var(--space-4); }
.section-header p { font-size: var(--text-md); color: var(--text-muted); }

/* ===== Index Business Cards ===== */
.index-cards { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--space-5); }
.index-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: var(--space-8) var(--space-4); text-align: center; transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base); }
.index-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.index-card-icon { width: 70px; height: 70px; margin: 0 auto var(--space-4); background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; }
.index-card-icon i { font-size: 28px; color: #fff; }
.index-card h5 { font-size: var(--text-md); font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-1); }
.index-card p { font-size: var(--text-xs); color: var(--text-hint); }

/* ===== Index About Section ===== */
.about-row { display: flex; gap: var(--space-12); align-items: center; }
.about-text { flex: 1; }
.about-text h2 { font-size: clamp(22px, 3vw, 28px); font-weight: 800; color: var(--color-primary); margin-bottom: var(--space-3); line-height: 1.4; }
.about-text .bar { width: 50px; height: 3px; background: var(--color-primary); margin-bottom: var(--space-5); }
.about-text p { color: var(--text-secondary); line-height: 1.8; margin-bottom: var(--space-5); }
.about-text .btn-outline { display: inline-block; padding: var(--space-3) var(--space-6); border: 2px solid var(--color-primary); color: var(--color-primary); font-weight: 600; border-radius: var(--radius-sm); transition: background var(--transition-base), color var(--transition-base); }
.about-text .btn-outline:hover { background: var(--color-primary); color: #fff; }
.about-features { flex: 1; display: flex; flex-direction: column; gap: var(--space-4); }
.about-feature { background: var(--bg-white); border-radius: var(--radius-lg); padding: var(--space-6); display: flex; align-items: flex-start; gap: var(--space-4); box-shadow: var(--shadow-sm); transition: transform var(--transition-base), box-shadow var(--transition-base); }
.about-feature:hover { transform: translateX(5px); box-shadow: var(--shadow-md); }
.about-feature i { font-size: 22px; color: var(--color-primary); width: 48px; height: 48px; background: var(--color-primary-bg); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.about-feature h5 { font-size: var(--text-lg); font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-1); }
.about-feature p { font-size: var(--text-sm); color: var(--text-muted); margin-bottom: 0; }

/* ===== Index Solutions Grid ===== */
.solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.solution-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: var(--space-8) var(--space-6); transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base); display: block; }
.solution-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.solution-num { font-size: 40px; font-weight: 900; color: #f0f0f0; margin-bottom: var(--space-2); line-height: 1; }
.solution-card:hover .solution-num { color: var(--color-primary-15); }
.solution-card h4 { font-size: var(--text-xl); font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-2); }
.solution-card p { font-size: var(--text-base); color: var(--text-muted); margin-bottom: var(--space-4); }
.solution-card .more { font-size: var(--text-sm); font-weight: 600; color: var(--color-primary); letter-spacing: 1px; }

/* ===== CTA Section ===== */
.section-cta { background: linear-gradient(135deg, rgba(26,82,118,0.93), rgba(41,128,185,0.88)), url('../images/cta-bg.jpg') center/cover no-repeat; color: #fff; padding: var(--space-20) 0; text-align: center; }
.section-cta h2 { font-size: clamp(22px, 3vw, 30px); font-weight: 800; margin-bottom: var(--space-3); }
.section-cta p { font-size: var(--text-lg); opacity: 0.85; margin-bottom: var(--space-6); }
.cta-buttons { display: flex; justify-content: center; gap: var(--space-4); flex-wrap: wrap; }
.cta-buttons .btn-white { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-3) var(--space-8); background: #fff; color: var(--color-primary); font-weight: 700; border-radius: var(--radius-sm); transition: transform var(--transition-base), box-shadow var(--transition-base); }
.cta-buttons .btn-white:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.2); }
.cta-buttons .btn-ghost { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-3) var(--space-8); border: 2px solid rgba(255,255,255,0.5); color: #fff; font-weight: 600; border-radius: var(--radius-sm); transition: background var(--transition-base), border-color var(--transition-base); }
.cta-buttons .btn-ghost:hover { background: rgba(255,255,255,0.1); border-color: #fff; }

/* ===== History Timeline ===== */
.timeline { position: relative; padding-left: 140px; }
.timeline::before { content: ''; position: absolute; left: 120px; top: 0; bottom: 0; width: 2px; background: var(--border-color); }
.timeline-item { position: relative; margin-bottom: var(--space-8); }
.timeline-year { position: absolute; left: -140px; width: 100px; text-align: right; font-size: var(--text-xl); font-weight: 800; color: var(--color-primary); padding-top: var(--space-2); }
.timeline-dot { position: absolute; left: -24px; top: 12px; width: 12px; height: 12px; border-radius: var(--radius-full); background: var(--color-primary); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--color-primary); }
.timeline-content { background: var(--bg-gray); border-radius: var(--radius-md); padding: var(--space-4) var(--space-6); margin-left: var(--space-2); }
.timeline-content p { font-size: var(--text-base); color: var(--text-secondary); margin-bottom: var(--space-1); }

/* ===== Organization Chart ===== */
.org-chart { text-align: center; padding: var(--space-8) 0; }
.org-ceo { display: inline-block; padding: var(--space-4) var(--space-10); background: var(--color-primary); color: #fff; border-radius: var(--radius-md); font-weight: 700; font-size: var(--text-xl); margin-bottom: var(--space-8); }
.org-line { width: 2px; height: 30px; background: var(--color-primary); margin: 0 auto; }
.org-hline { height: 2px; background: var(--color-primary); margin: 0 auto 0; }
.org-depts { display: flex; justify-content: center; gap: var(--space-8); margin-top: var(--space-8); flex-wrap: wrap; }
.org-dept { background: var(--bg-white); border: 2px solid var(--color-primary-light); border-radius: var(--radius-md); padding: var(--space-3) var(--space-6); font-weight: 600; font-size: var(--text-md); color: var(--color-primary); }

/* ===== Board Table ===== */
.board-table { width: 100%; border-collapse: collapse; }
.board-table th { background: var(--color-primary); color: #fff; padding: var(--space-3) var(--space-4); font-size: var(--text-base); font-weight: 600; }
.board-table td { padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--border-color); font-size: var(--text-base); color: var(--text-secondary); }
.board-table tbody tr:hover td { background: var(--bg-gray); }
.board-empty { text-align: center; padding: var(--space-12) 0; color: var(--text-muted); }
.board-empty i { font-size: 48px; color: var(--border-color); display: block; margin-bottom: var(--space-4); }

/* ===== FAQ ===== */
.faq-item { border: 1px solid var(--border-color); border-radius: var(--radius-md); margin-bottom: var(--space-3); overflow: hidden; }
.faq-question { display: flex; justify-content: space-between; align-items: center; padding: var(--space-4) var(--space-6); cursor: pointer; font-weight: 600; font-size: var(--text-md); color: var(--color-dark); background: var(--bg-gray); transition: background var(--transition-base); }
.faq-question:hover { background: var(--color-primary-bg); }
.faq-question i { color: var(--color-primary); transition: transform var(--transition-base); }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height var(--transition-base); }
.faq-answer-inner { padding: var(--space-5) var(--space-6); color: var(--text-secondary); line-height: 1.8; font-size: var(--text-base); }
.faq-item.active .faq-answer { max-height: 300px; }

/* ===== Contact Form ===== */
.contact-form { max-width: 700px; }
.form-group { margin-bottom: var(--space-5); }
.form-group label { display: block; font-weight: 600; margin-bottom: var(--space-2); font-size: var(--text-base); color: var(--color-dark); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: var(--space-3) var(--space-4); border: 1px solid var(--border-color); border-radius: var(--radius-md); font-size: var(--text-base); font-family: inherit; transition: border-color var(--transition-base), box-shadow var(--transition-base); }
.form-group input:focus-visible, .form-group select:focus-visible, .form-group textarea:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 1px; border-color: var(--color-primary); }
.form-group textarea { height: 150px; resize: vertical; }
.btn-submit { display: inline-block; padding: var(--space-3) var(--space-10); background: var(--color-primary); color: #fff; font-size: var(--text-md); font-weight: 700; border: none; border-radius: var(--radius-sm); cursor: pointer; transition: background var(--transition-base), transform var(--transition-base); }
.btn-submit:hover { background: var(--color-primary-light); transform: translateY(-2px); }

/* ===== Recruit Cards ===== */
.recruit-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.recruit-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: var(--space-8) var(--space-6); text-align: center; transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base); }
.recruit-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.recruit-card i { font-size: 36px; color: var(--color-primary); margin-bottom: var(--space-4); }
.recruit-card h5 { font-size: var(--text-xl); font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-2); }
.recruit-card p { font-size: var(--text-base); color: var(--text-muted); margin-bottom: 0; }

/* ===== Address Info ===== */
.address-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); margin-bottom: var(--space-8); }
.address-card { background: var(--bg-gray); border-radius: var(--radius-md); padding: var(--space-6); text-align: center; }
.address-card i { font-size: 24px; color: var(--color-primary); margin-bottom: var(--space-2); }
.address-card h5 { font-size: var(--text-base); font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-1); }
.address-card p { font-size: var(--text-sm); color: var(--text-muted); margin-bottom: 0; }
.map-wrap { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.map-wrap iframe { width: 100%; height: 400px; border: none; }
.transport-info { display: flex; gap: var(--space-4); margin-top: var(--space-4); flex-wrap: wrap; }
.transport-item { display: flex; gap: var(--space-2); align-items: center; color: var(--text-secondary); font-size: var(--text-base); }
.transport-item i { color: var(--color-primary); }
.board-loading { color: var(--text-muted); text-align: center; padding: var(--space-10) 0; }
.btn-retry { margin-left: var(--space-2); padding: var(--space-1) var(--space-3); background: var(--color-primary); color: #fff; border: none; border-radius: var(--radius-sm); cursor: pointer; font-size: var(--text-sm); }

/* ===== Additional Responsive ===== */
@media (max-width: 992px) {
    .index-cards { grid-template-columns: repeat(3, 1fr); }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }
    .about-row { flex-direction: column; }
    .recruit-cards { grid-template-columns: repeat(2, 1fr); }
    .address-cards { grid-template-columns: 1fr; }
    .timeline { padding-left: 100px; }
    .timeline::before { left: 80px; }
    .timeline-year { left: -100px; width: 65px; font-size: var(--text-md); }
    .page-layout { flex-direction: column; }
    .sidebar { width: 100%; }
    .business-cards, .rfid-items { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .container { padding: 0 var(--space-4); }
    .nav-toggle { display: flex; }
    .header .container { flex-wrap: wrap; height: auto; padding: var(--space-3) var(--space-4); }
    .nav-menu { display: none; flex-direction: column; width: 100%; border-top: 1px solid var(--border-color); padding-top: var(--space-2); }
    .nav-menu.active { display: flex; }
    .nav-item > a { padding: var(--space-3) var(--space-5); min-height: 44px; display: flex; align-items: center; }
    .sub-menu { position: static; box-shadow: none; border-top: none; background: var(--bg-gray); }
    .sub-menu .has-sub > .sub-menu { position: static; border-top: none; }
    .nav-item.open > .sub-menu { display: block; }
    .hero { min-height: 80vh; }
    .hero-content { padding: var(--space-20) 0 var(--space-16); }
    .section { padding: var(--space-12) 0; }
    .index-cards { grid-template-columns: repeat(2, 1fr); }
    .solutions-grid { grid-template-columns: 1fr; }
    .recruit-cards { grid-template-columns: 1fr; }
    .cta-buttons { flex-direction: column; align-items: center; }
    .cta-buttons .btn-white, .cta-buttons .btn-ghost { width: 100%; justify-content: center; text-align: center; }
    .timeline { padding-left: 0; }
    .timeline::before { display: none; }
    .timeline-year { position: static; text-align: left; width: auto; margin-bottom: 5px; }
    .timeline-dot { display: none; }
    .timeline-content { margin-left: 0; }
    .org-depts { flex-direction: column; align-items: center; }
    .business-cards, .rfid-items { grid-template-columns: 1fr; }
    .content-img { height: 180px; }
    .about-img { height: 160px; }
    .logo-img { height: 32px; }
    .board-table thead { display: none; }
    .board-table tbody tr { display: flex; flex-wrap: wrap; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--border-color); gap: var(--space-2); }
    .board-table tbody tr td { border-bottom: none; padding: var(--space-1) 0; }
    .board-table tbody tr td:nth-child(1) { display: none; }
    .board-table tbody tr td:nth-child(2) { width: 100%; font-weight: 600; }
    .board-table tbody tr td:nth-child(3) { order: -1; }
    .board-detail-meta { flex-wrap: wrap; gap: var(--space-2); }
    .board-modal { width: 96%; }
    .board-modal-body { padding: var(--space-4); }
    .product-tabs { gap: var(--space-1); }
    .product-tab { padding: var(--space-3) var(--space-4); font-size: var(--text-sm); min-height: 44px; }
    .section-header { margin-bottom: var(--space-8); }
}
@media (max-width: 576px) {
    .index-cards { grid-template-columns: 1fr; }
    .top-bar { font-size: var(--text-xs); }
    .top-bar-right { gap: var(--space-1); }
    .hero p br { display: none; }
}

/* ===== Footer ===== */
.footer { background: var(--bg-dark); color: #ccc; padding: var(--space-10) 0 var(--space-8); font-size: var(--text-base); }
.footer-info { text-align: center; margin-bottom: var(--space-5); }
.footer-info p { margin-bottom: var(--space-2); line-height: 1.8; }
.footer-info strong { color: #fff; font-size: var(--text-lg); }
.footer-info i { margin-right: 5px; color: var(--color-info); }
.footer-copyright { text-align: center; padding-top: var(--space-5); border-top: 1px solid #3d5068; font-size: var(--text-sm); color: #aaa; }

/* ===== Board Detail Modal ===== */
.board-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 2000; backdrop-filter: blur(4px); opacity: 0; visibility: hidden; display: flex; align-items: center; justify-content: center; transition: opacity var(--transition-base), visibility var(--transition-base); }
.board-overlay.show { opacity: 1; visibility: visible; }
.board-modal { background: var(--bg-white); width: 90%; max-width: 720px; max-height: 85vh; border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-xl); transform: translateY(20px); transition: transform var(--transition-base); }
.board-overlay.show .board-modal { transform: translateY(0); }
.board-modal-header { display: flex; align-items: center; justify-content: space-between; padding: var(--space-5) var(--space-6); background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); color: #fff; }
.board-modal-header h4 { font-size: var(--text-sm); font-weight: 400; opacity: 0.85; letter-spacing: 1px; text-transform: uppercase; }
.board-modal-close { width: 44px; height: 44px; border: none; background: rgba(255,255,255,0.15); color: #fff; border-radius: var(--radius-full); font-size: var(--text-xl); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background var(--transition-base), transform var(--transition-base); }
.board-modal-close:hover { background: rgba(255,255,255,0.3); transform: rotate(90deg); }
.board-modal-body { padding: var(--space-6); overflow-y: auto; max-height: calc(85vh - 140px); }
.board-detail-title { font-size: 22px; font-weight: 800; color: var(--color-primary); margin-bottom: var(--space-3); line-height: 1.4; }
.board-detail-meta { display: flex; gap: var(--space-5); padding-bottom: var(--space-4); margin-bottom: var(--space-5); border-bottom: 1px solid var(--border-light); font-size: var(--text-sm); color: var(--text-hint); }
.board-detail-meta span i { margin-right: 5px; color: #bbb; }
/* 게시판 검색 */
.board-search { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-4); flex-wrap: wrap; }
.board-search-input-wrap { position: relative; flex: 1; min-width: 240px; max-width: 420px; }
.board-search-icon { position: absolute; left: var(--space-3); top: 50%; transform: translateY(-50%); color: var(--text-hint); font-size: var(--text-sm); pointer-events: none; }
.board-search-input { width: 100%; padding: var(--space-2) var(--space-10) var(--space-2) var(--space-8); font-size: var(--text-sm); border: 1px solid var(--border-color); border-radius: var(--radius-md); background: #fff; transition: border-color var(--transition-base), box-shadow var(--transition-base); }
.board-search-input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1); }
.board-search-clear { position: absolute; right: var(--space-2); top: 50%; transform: translateY(-50%); width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; background: #e5e5e5; color: #666; border: none; border-radius: 50%; cursor: pointer; font-size: 11px; transition: background var(--transition-base); }
.board-search-clear:hover { background: #ccc; color: #000; }
.board-search-result { font-size: var(--text-sm); color: var(--color-primary); font-weight: 600; }
.board-no-result { text-align: center; padding: var(--space-10) var(--space-4); color: var(--text-hint); }
.board-no-result i { font-size: 2.5rem; margin-bottom: var(--space-3); color: #ccc; display: block; }
.board-no-result p { font-size: var(--text-md); margin: 0; }
@media (max-width: 600px) {
    .board-search-input-wrap { max-width: 100%; }
}

.board-detail-content { line-height: 1.9; color: #444; font-size: var(--text-md); }
.board-detail-content p { margin-bottom: var(--space-4); }
.board-detail-content a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; font-weight: 500; word-break: break-all; transition: color var(--transition-base); }
.board-detail-content a:hover { color: #003d7a; text-decoration-thickness: 2px; background: rgba(0, 86, 179, 0.06); }
.board-detail-content a[target="_blank"]::after { content: "\f35d"; font-family: "Font Awesome 6 Free"; font-weight: 900; font-size: 0.75em; margin-left: 4px; opacity: 0.7; }
.board-detail-content ul { margin: var(--space-3) 0 var(--space-4) var(--space-5); list-style: disc; }
.board-detail-content ul li { margin-bottom: var(--space-2); line-height: 1.7; }
.board-detail-content h4 { font-size: var(--text-lg); font-weight: 700; color: var(--color-dark); margin: var(--space-5) 0 var(--space-3); padding-left: var(--space-2); border-left: 3px solid var(--color-primary); }
.board-detail-content strong { color: var(--color-dark); }
.board-modal-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--border-light); display: flex; justify-content: flex-end; gap: var(--space-2); }
.board-modal-footer .btn-list { display: inline-flex; align-items: center; gap: var(--space-1); padding: var(--space-2) var(--space-5); background: #f0f0f0; color: var(--text-secondary); font-size: var(--text-sm); font-weight: 600; border: none; border-radius: var(--radius-sm); cursor: pointer; transition: background var(--transition-base); }
.board-modal-footer .btn-list:hover { background: var(--border-color); }

/* Board table hover enhancement */
.board-table tbody tr { cursor: pointer; transition: background var(--transition-fast); }
.board-table tbody tr:hover td { background: var(--color-primary-bg); color: var(--color-primary); }
.board-table tbody tr td:nth-child(2) a { transition: color var(--transition-fast); }
.board-table tbody tr:hover td:nth-child(2) a { color: var(--color-primary); font-weight: 500; }

/* ===== Board Attachments ===== */
.td-attach { text-align: center; width: 50px; color: var(--color-primary); }
.attach-section { margin-top: var(--space-6); padding-top: var(--space-5); border-top: 1px solid var(--border-light); }
.attach-section h5 { font-size: var(--text-base); font-weight: 700; color: var(--color-dark); margin-bottom: var(--space-2); }
.attach-section h5 i { color: var(--color-primary); margin-right: var(--space-1); }
.attach-list { list-style: none; }
.attach-list li { padding: var(--space-2) 0; }
.attach-list li a { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-4); background: var(--color-primary-bg); border: 1px solid #d4e6f1; border-radius: var(--radius-sm); font-size: var(--text-sm); color: var(--color-primary); font-weight: 500; transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base); }
.attach-list li a:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.attach-list li a:hover .attach-size { color: rgba(255,255,255,0.7); }
.attach-size { font-size: var(--text-xs); color: var(--text-muted); font-weight: 400; }

/* ===== Product Tabs ===== */
.product-tabs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-6); }
.product-tab { padding: var(--space-3) var(--space-5); background: #f0f0f0; border: 1px solid #ddd; border-radius: var(--radius-sm); font-size: var(--text-base); font-weight: 500; color: var(--text-secondary); cursor: pointer; transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base); min-height: 44px; display: inline-flex; align-items: center; }
.product-tab:hover { background: #e0e8ef; color: var(--color-primary); border-color: #b0c4d8; }
.product-tab.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); font-weight: 600; }

/* ===== Back to Top ===== */
.back-to-top { position: fixed; bottom: var(--space-8); right: var(--space-8); width: 45px; height: 45px; background: var(--color-primary); color: #fff; border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; font-size: var(--text-xl); box-shadow: var(--shadow-sm); transition: background var(--transition-base), transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base); z-index: 999; opacity: 0; visibility: hidden; pointer-events: none; }
.back-to-top.show { opacity: 1; visibility: visible; pointer-events: auto; }
.back-to-top:hover { background: var(--color-primary-light); transform: translateY(-3px); }