/* ============================================================
   SolidFix Co., Ltd. — Main Stylesheet
   Design concept: Premium B2B Industrial (inspired by K-Ensol)
   Color palette: Deep Navy + Steel Gray + White + Accent Blue
   ============================================================ */

/* ===== CSS VARIABLES ===== */
:root {
    --navy:        #0a1628;
    --navy-mid:    #0f2040;
    --navy-light:  #1a3560;
    --blue:        #1a6cb5;
    --blue-bright: #2a85d8;
    --cyan:        #00c4e8;
    --steel:       #4a5568;
    --gray-dark:   #2d3748;
    --gray-mid:    #6b7280;
    --gray-light:  #e5e7eb;
    --gray-ultra:  #f8fafc;
    --white:       #ffffff;
    --accent:      #e8b000;

    --font-ko: 'Noto Sans KR', sans-serif;
    --font-en: 'Inter', sans-serif;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --shadow-sm: 0 2px 8px rgba(10,22,40,0.08);
    --shadow-md: 0 8px 32px rgba(10,22,40,0.14);
    --shadow-lg: 0 20px 60px rgba(10,22,40,0.2);

    --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
    --transition-slow: 0.6s cubic-bezier(0.4,0,0.2,1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-ko);
    color: var(--gray-dark);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== TYPOGRAPHY ===== */
.section-tag {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--blue-bright);
    background: rgba(42,133,216,0.1);
    padding: 4px 12px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-tag.light {
    color: var(--cyan);
    background: rgba(0,196,232,0.15);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 800;
    color: var(--navy);
    line-height: 1.25;
    margin-bottom: 16px;
}

.section-title.left { text-align: left; }
.section-title.light { color: var(--white); }

.section-desc {
    font-size: 1.05rem;
    color: var(--gray-mid);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.8;
}

.section-desc.light { color: rgba(255,255,255,0.7); }

/* ===== BUTTONS ===== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--blue);
    color: var(--white);
    padding: 13px 28px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transform: translateX(-100%);
    transition: var(--transition);
}

.btn-primary:hover { background: var(--navy-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26,108,181,0.35); }
.btn-primary:hover::after { transform: translateX(100%); }

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 2px solid var(--blue);
    color: var(--blue);
    padding: 11px 26px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-outline:hover { background: var(--blue); color: var(--white); transform: translateY(-2px); }

.btn-outline-light {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 2px solid rgba(255,255,255,0.6);
    color: var(--white);
    padding: 13px 28px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.btn-outline-light:hover { background: rgba(255,255,255,0.15); border-color: var(--white); transform: translateY(-2px); }

.btn-primary-lg {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--white);
    color: var(--navy);
    padding: 16px 36px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    transition: var(--transition);
}

.btn-primary-lg:hover { background: var(--cyan); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(0,196,232,0.3); }

.btn-outline-lg {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: 2px solid rgba(255,255,255,0.5);
    color: var(--white);
    padding: 14px 34px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-outline-lg:hover { background: rgba(255,255,255,0.1); border-color: var(--white); transform: translateY(-3px); }

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
    padding: 0;
}

.header.scrolled {
    background: rgba(10,22,40,0.97);
    box-shadow: 0 4px 24px rgba(0,0,0,0.3);
    backdrop-filter: blur(12px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 32px;
    height: 80px;
}

/* Logo */
.logo a {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.logo .logo-main {
    font-family: var(--font-en);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: -0.02em;
}

.logo .logo-sub {
    font-family: var(--font-en);
    font-size: 0.65rem;
    font-weight: 400;
    color: rgba(255,255,255,0.55);
    letter-spacing: 0.1em;
    margin-top: 1px;
}

/* GNB */
.gnb-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.gnb-item {
    position: relative;
}

.gnb-link {
    display: block;
    padding: 28px 18px;
    font-size: 0.9rem;
    font-weight: 600;
    color: rgba(255,255,255,0.85);
    letter-spacing: 0.02em;
    transition: color var(--transition);
    white-space: nowrap;
}

.gnb-link:hover, .gnb-item:hover .gnb-link { color: var(--cyan); }

/* GNB underline effect */
.gnb-link::after {
    content: '';
    position: absolute;
    bottom: 20px;
    left: 18px;
    right: 18px;
    height: 2px;
    background: var(--cyan);
    transform: scaleX(0);
    transition: transform var(--transition);
    transform-origin: left;
}

.gnb-item:hover .gnb-link::after, .gnb-link.active::after { transform: scaleX(1); }

/* Sub-menu */
.sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--navy-mid);
    min-width: 180px;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    box-shadow: var(--shadow-md);
    border-top: 2px solid var(--blue-bright);
    overflow: hidden;
    opacity: 0;
    transform: translateX(-50%) translateY(-10px);
    transition: opacity var(--transition), transform var(--transition);
    pointer-events: none;
}

.gnb-item:hover .sub-menu {
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
    animation: subMenuIn 0.25s ease forwards;
}

@keyframes subMenuIn {
    from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.sub-menu li a {
    display: block;
    padding: 11px 20px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.75);
    transition: color var(--transition), background var(--transition), padding var(--transition);
}

.sub-menu li a:hover {
    color: var(--cyan);
    background: rgba(255,255,255,0.05);
    padding-left: 26px;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-inquiry {
    background: var(--blue);
    color: var(--white);
    padding: 9px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-inquiry:hover { background: var(--blue-bright); transform: translateY(-1px); }

.lang-toggle {
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 600;
    color: rgba(255,255,255,0.55);
    letter-spacing: 0.05em;
    transition: color var(--transition);
}

.lang-toggle:hover { color: var(--cyan); }

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
    transform-origin: center;
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
.mobile-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 1090;
}

.mobile-nav {
    position: fixed;
    top: 0; right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--navy);
    z-index: 1100;
    transition: right var(--transition);
    padding: 80px 32px 40px;
    overflow-y: auto;
}

.mobile-nav.open { right: 0; }
.mobile-nav-overlay.show { display: block; }

.mobile-nav-close {
    position: absolute;
    top: 24px; right: 24px;
    color: rgba(255,255,255,0.6);
    font-size: 1.2rem;
    transition: color var(--transition);
}

.mobile-nav-close:hover { color: var(--cyan); }

.mobile-nav-list li {
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.mobile-nav-list a {
    display: block;
    padding: 14px 0;
    color: rgba(255,255,255,0.85);
    font-size: 1rem;
    font-weight: 500;
    transition: color var(--transition), padding var(--transition);
}

.mobile-nav-list a:hover { color: var(--cyan); padding-left: 8px; }

.mobile-nav-contact {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.mobile-nav-contact p {
    color: rgba(255,255,255,0.55);
    font-size: 0.9rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-inquiry-mobile {
    display: block;
    background: var(--blue);
    color: var(--white);
    text-align: center;
    padding: 12px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-inquiry-mobile:hover { background: var(--blue-bright); }

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 640px;
    overflow: hidden;
}

.hero-slides { position: relative; width: 100%; height: 100%; }

.hero-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 1s ease;
}

.hero-slide.active { opacity: 1; }

/* Slide backgrounds */
.hero-slide[data-bg="slide-1"] {
    background: linear-gradient(135deg, #0a1628 0%, #0f2040 40%, #1a3560 100%);
}

.hero-slide[data-bg="slide-1"]::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 600px 400px at 70% 50%, rgba(26,108,181,0.25) 0%, transparent 70%),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 60px,
            rgba(42,133,216,0.04) 60px,
            rgba(42,133,216,0.04) 61px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 60px,
            rgba(42,133,216,0.04) 60px,
            rgba(42,133,216,0.04) 61px
        );
}

.hero-slide[data-bg="slide-2"] {
    background: linear-gradient(135deg, #060f1e 0%, #0a1628 40%, #1a3560 100%);
}

.hero-slide[data-bg="slide-2"]::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 500px 500px at 60% 60%, rgba(0,196,232,0.15) 0%, transparent 70%),
        radial-gradient(ellipse 300px 300px at 80% 20%, rgba(26,108,181,0.2) 0%, transparent 60%);
}

.hero-slide[data-bg="slide-3"] {
    background: linear-gradient(135deg, #0a1628 0%, #12263f 50%, #1e3a5e 100%);
}

.hero-slide[data-bg="slide-3"]::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 700px 300px at 50% 70%, rgba(26,108,181,0.2) 0%, transparent 70%);
}

/* Geometric decoration for hero */
.hero-slide::after {
    content: '';
    position: absolute;
    right: -80px;
    top: 50%;
    transform: translateY(-50%);
    width: 600px;
    height: 600px;
    border: 1px solid rgba(42,133,216,0.12);
    border-radius: 50%;
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(10,22,40,0.6) 0%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    width: 100%;
}

.hero-tag {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--cyan);
    border: 1px solid rgba(0,196,232,0.4);
    padding: 5px 14px;
    border-radius: 50px;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.6rem);
    font-weight: 900;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero-title em {
    font-style: normal;
    color: var(--cyan);
    display: block;
}

.hero-desc {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 520px;
}

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

/* Slide Controls */
.hero-controls {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 10;
}

.hero-prev, .hero-next {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.3);
    color: rgba(255,255,255,0.7);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.hero-prev:hover, .hero-next:hover {
    background: var(--blue);
    border-color: var(--blue);
    color: var(--white);
}

.hero-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--cyan);
    width: 24px;
    border-radius: 4px;
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    right: 40px;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 10;
}

.scroll-indicator span {
    font-family: var(--font-en);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    color: rgba(255,255,255,0.4);
    text-transform: uppercase;
    writing-mode: vertical-rl;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
    animation: scrollLineAnim 1.5s ease-in-out infinite;
}

@keyframes scrollLineAnim {
    0%, 100% { transform: scaleY(1); opacity: 1; }
    50% { transform: scaleY(0.5); opacity: 0.4; }
}

/* ===== INTRO STRIP ===== */
.intro-strip {
    background: var(--navy);
    padding: 32px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.intro-strip-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
}

.intro-strip-item {
    padding: 20px 30px;
    text-align: center;
    border-right: 1px solid rgba(255,255,255,0.08);
    transition: background var(--transition);
}

.intro-strip-item:last-child { border-right: none; }
.intro-strip-item:hover { background: rgba(255,255,255,0.03); }

.intro-num {
    font-family: var(--font-en);
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--cyan);
    line-height: 1;
    display: inline-block;
}

.intro-unit {
    font-family: var(--font-en);
    font-size: 1.2rem;
    font-weight: 700;
    color: rgba(255,255,255,0.5);
    margin-left: 2px;
}

.intro-strip-item p {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.45);
    margin-top: 6px;
    letter-spacing: 0.02em;
}

/* ===== BUSINESS DIVISION ===== */
.business {
    padding: 120px 0;
    background: var(--gray-ultra);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.business-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    position: relative;
}

.business-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.business-card.featured {
    border: 2px solid var(--blue);
    box-shadow: 0 4px 30px rgba(26,108,181,0.15);
}

.business-card.featured::before {
    content: 'CORE';
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--blue);
    color: var(--white);
    font-family: var(--font-en);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    padding: 3px 10px;
    border-radius: 50px;
    z-index: 5;
}

/* Card image areas with gradient backgrounds */
.business-card-img {
    height: 220px;
    position: relative;
    display: flex;
    align-items: flex-end;
    padding: 24px;
}

.cleanroom-img {
    background:
        linear-gradient(135deg, #0f2040 0%, #1a3560 50%, #2a5090 100%),
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 10px,
            rgba(255,255,255,0.02) 10px,
            rgba(255,255,255,0.02) 11px
        );
}

.vacuum-img {
    background: linear-gradient(135deg, #080d1a 0%, #0d1f3c 50%, #1a3060 100%);
}

.vacuum-img::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 200px 200px at 70% 40%, rgba(0,196,232,0.2) 0%, transparent 70%);
}

.machine-img {
    background: linear-gradient(135deg, #1a2a3a 0%, #263d52 50%, #1a4060 100%);
}

.business-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
}

.business-card-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--cyan);
    backdrop-filter: blur(4px);
    transition: transform var(--transition), background var(--transition);
}

.business-card:hover .business-card-icon {
    transform: translate(-50%, -50%) scale(1.1);
    background: rgba(26,108,181,0.3);
}

.business-card-body {
    padding: 28px;
}

.card-label {
    font-family: var(--font-en);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--blue);
    display: block;
    margin-bottom: 8px;
}

.business-card-body h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--navy);
    line-height: 1.35;
    margin-bottom: 12px;
}

.business-card-body p {
    font-size: 0.88rem;
    color: var(--gray-mid);
    line-height: 1.7;
    margin-bottom: 18px;
}

.business-features {
    margin-bottom: 22px;
}

.business-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--steel);
    margin-bottom: 6px;
}

.business-features li i {
    color: var(--blue);
    font-size: 0.75rem;
    flex-shrink: 0;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--blue);
    transition: color var(--transition), gap var(--transition);
}

.card-link:hover { color: var(--navy); gap: 12px; }

/* ===== ABOUT SECTION ===== */
.about-section {
    padding: 120px 0;
    background: var(--white);
    position: relative;
    overflow: hidden;
}

.about-bg-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-en);
    font-size: clamp(80px, 15vw, 160px);
    font-weight: 900;
    color: rgba(10,22,40,0.03);
    white-space: nowrap;
    pointer-events: none;
    letter-spacing: -0.05em;
    user-select: none;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-visual {
    position: relative;
}

.about-img-box {
    position: relative;
}

.about-img-inner {
    width: 100%;
    padding-bottom: 120%;
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 60%, #2a5090 100%);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.about-img-inner::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 300px 300px at 30% 40%, rgba(0,196,232,0.15) 0%, transparent 70%),
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 20px,
            rgba(255,255,255,0.02) 20px,
            rgba(255,255,255,0.02) 21px
        );
}

.about-img-inner::after {
    content: 'SolidFix';
    position: absolute;
    bottom: 30px;
    left: 30px;
    font-family: var(--font-en);
    font-size: 3rem;
    font-weight: 900;
    color: rgba(255,255,255,0.06);
    letter-spacing: -0.03em;
}

.about-badge {
    position: absolute;
    bottom: 32px;
    left: 32px;
    background: var(--blue);
    color: var(--white);
    padding: 14px 20px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 2;
    box-shadow: 0 8px 24px rgba(26,108,181,0.4);
}

.about-badge i { font-size: 1.2rem; }
.about-badge span { font-size: 0.85rem; font-weight: 600; }

.about-tag-1, .about-tag-2 {
    position: absolute;
    background: var(--white);
    color: var(--navy);
    font-size: 0.78rem;
    font-weight: 700;
    padding: 8px 14px;
    border-radius: 50px;
    box-shadow: var(--shadow-md);
    white-space: nowrap;
}

.about-tag-1 { top: 24px; right: -20px; }
.about-tag-2 { top: 70px; right: -20px; }

.about-content { position: relative; }

.about-lead {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--navy);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-body {
    font-size: 0.95rem;
    color: var(--gray-mid);
    line-height: 1.85;
    margin-bottom: 36px;
}

.about-strengths {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 36px;
}

.strength-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--gray-ultra);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--blue);
    transition: transform var(--transition), box-shadow var(--transition);
}

.strength-item:hover { transform: translateX(4px); box-shadow: var(--shadow-sm); }

.strength-icon {
    width: 36px;
    height: 36px;
    background: rgba(26,108,181,0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.strength-text strong {
    display: block;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 2px;
}

.strength-text span {
    font-size: 0.75rem;
    color: var(--gray-mid);
    line-height: 1.5;
}

/* ===== PRODUCTS SECTION ===== */
.products-section {
    padding: 120px 0;
    background: var(--gray-ultra);
}

.product-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 48px;
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 6px;
    box-shadow: var(--shadow-sm);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.tab-btn {
    padding: 11px 28px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-mid);
    transition: var(--transition);
}

.tab-btn:hover { color: var(--navy); background: var(--gray-ultra); }

.tab-btn.active {
    background: var(--navy);
    color: var(--white);
}

.product-tab-content {
    display: none;
}

.product-tab-content.active { display: block; }

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-light);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--blue), var(--cyan));
    transform: scaleX(0);
    transition: transform var(--transition);
    transform-origin: left;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(26,108,181,0.2);
}

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

.product-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--blue), var(--blue-bright));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 16px;
    box-shadow: 0 4px 12px rgba(26,108,181,0.3);
}

.product-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 10px;
}

.product-card p {
    font-size: 0.85rem;
    color: var(--gray-mid);
    line-height: 1.7;
    margin-bottom: 14px;
}

.product-spec {
    font-family: var(--font-en);
    font-size: 0.75rem;
    color: var(--blue);
    background: rgba(26,108,181,0.08);
    padding: 4px 10px;
    border-radius: 4px;
    display: inline-block;
    font-weight: 500;
}

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

/* ===== TECHNOLOGY SECTION ===== */
.tech-section {
    padding: 120px 0;
    position: relative;
    overflow: hidden;
}

.tech-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--navy) 0%, #0f2040 50%, #122840 100%);
}

.tech-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 800px 400px at 10% 80%, rgba(26,108,181,0.2) 0%, transparent 60%),
        radial-gradient(ellipse 600px 600px at 90% 20%, rgba(0,196,232,0.1) 0%, transparent 60%),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 30px,
            rgba(255,255,255,0.01) 30px,
            rgba(255,255,255,0.01) 31px
        );
}

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

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.tech-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition), background var(--transition), border-color var(--transition);
    backdrop-filter: blur(4px);
}

.tech-card:hover {
    transform: translateY(-6px);
    background: rgba(255,255,255,0.07);
    border-color: rgba(0,196,232,0.3);
}

.tech-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--blue), var(--cyan));
    transform: scaleX(0);
    transition: transform var(--transition);
    transform-origin: left;
}

.tech-card:hover::after { transform: scaleX(1); }

.tech-num {
    font-family: var(--font-en);
    font-size: 3rem;
    font-weight: 900;
    color: rgba(255,255,255,0.05);
    line-height: 1;
    margin-bottom: 8px;
    letter-spacing: -0.05em;
}

.tech-icon {
    width: 48px;
    height: 48px;
    background: rgba(42,133,216,0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    font-size: 1.2rem;
    margin-bottom: 18px;
    border: 1px solid rgba(0,196,232,0.2);
}

.tech-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
    line-height: 1.4;
}

.tech-card p {
    font-size: 0.84rem;
    color: rgba(255,255,255,0.55);
    line-height: 1.75;
    margin-bottom: 18px;
}

.tech-card ul {
    list-style: none;
}

.tech-card ul li {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.45);
    padding: 5px 0;
    border-top: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tech-card ul li::before {
    content: '—';
    color: var(--cyan);
    font-size: 0.7rem;
    flex-shrink: 0;
}

/* ===== MATERIALS SECTION ===== */
.materials-section {
    padding: 80px 0;
    background: var(--white);
    border-top: 1px solid var(--gray-light);
}

.materials-header {
    text-align: center;
    margin-bottom: 48px;
}

.materials-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 8px;
}

.materials-header p {
    font-size: 0.9rem;
    color: var(--gray-mid);
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
}

.material-item {
    text-align: center;
    padding: 24px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-light);
    transition: transform var(--transition), box-shadow var(--transition);
}

.material-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }

.material-color {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin: 0 auto 12px;
    border: 3px solid rgba(255,255,255,0.8);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.sus304 { background: linear-gradient(135deg, #8a9fb5, #b0c4d8); }
.sus316l { background: linear-gradient(135deg, #6b8fa8, #95b5c8); }
.swch { background: linear-gradient(135deg, #5a5a5a, #8a8a8a); }
.sts410 { background: linear-gradient(135deg, #7a8a9a, #a0adb8); }
.ep { background: linear-gradient(135deg, var(--blue), var(--cyan)); }
.unicro { background: linear-gradient(135deg, #c0c0c0, #e0e0e0); }

.material-item strong {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 4px;
}

.material-item span {
    font-size: 0.72rem;
    color: var(--gray-mid);
    line-height: 1.5;
}

/* ===== INDUSTRIES SECTION ===== */
.industries-section {
    padding: 120px 0;
    background: var(--gray-ultra);
}

.industry-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.industry-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    border: 1px solid var(--gray-light);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
}

.industry-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--blue);
}

.industry-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--navy), var(--navy-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.industry-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 10px;
}

.industry-card p {
    font-size: 0.85rem;
    color: var(--gray-mid);
    line-height: 1.75;
    margin-bottom: 18px;
}

.industry-products {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.industry-products span {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--blue);
    background: rgba(26,108,181,0.08);
    padding: 3px 10px;
    border-radius: 50px;
    border: 1px solid rgba(26,108,181,0.2);
}

/* ===== CTA SECTION ===== */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--navy) 0%, #0f2040 50%, var(--navy-light) 100%);
    position: relative;
    overflow: hidden;
}

.cta-bg-pattern {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 600px 400px at 80% 50%, rgba(0,196,232,0.08) 0%, transparent 70%),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 80px,
            rgba(255,255,255,0.02) 80px,
            rgba(255,255,255,0.02) 81px
        );
}

.cta-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.cta-tag {
    font-family: var(--font-en);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--cyan);
    display: block;
    margin-bottom: 16px;
}

.cta-content h2 {
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    font-weight: 800;
    color: var(--white);
    line-height: 1.25;
    margin-bottom: 18px;
}

.cta-content p {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.85;
    margin-bottom: 36px;
}

.cta-btns {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.cta-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.08);
    transition: background var(--transition);
}

.contact-item:hover { background: rgba(255,255,255,0.08); }

.contact-icon {
    width: 40px;
    height: 40px;
    background: rgba(42,133,216,0.25);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    font-size: 0.72rem;
    color: rgba(255,255,255,0.45);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.contact-item p {
    font-size: 0.9rem;
    color: var(--white);
    font-weight: 500;
}

/* ===== FOOTER ===== */
.footer {
    background: #060d1a;
    color: rgba(255,255,255,0.55);
    padding: 80px 0 0;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-logo {
    display: flex;
    flex-direction: column;
    margin-bottom: 16px;
}

.footer-logo .logo-main {
    font-family: var(--font-en);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--white);
}

.footer-logo .logo-sub {
    font-family: var(--font-en);
    font-size: 0.6rem;
    color: rgba(255,255,255,0.35);
    letter-spacing: 0.1em;
}

.footer-tagline {
    font-size: 0.82rem;
    line-height: 1.8;
    margin-bottom: 10px;
}

.footer-corp {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.3);
}

.footer-nav h5 {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 18px;
}

.footer-nav ul li {
    margin-bottom: 8px;
}

.footer-nav ul li a {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.45);
    transition: color var(--transition), padding var(--transition);
}

.footer-nav ul li a:hover { color: var(--cyan); padding-left: 6px; }

.footer-contact h5 {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 18px;
}

.footer-contact ul li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.82rem;
    margin-bottom: 10px;
    color: rgba(255,255,255,0.5);
}

.footer-contact ul li i {
    color: var(--blue);
    width: 14px;
    text-align: center;
    flex-shrink: 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.3);
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
}

.footer-bottom-links a {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.35);
    transition: color var(--transition);
}

.footer-bottom-links a:hover { color: var(--cyan); }

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed;
    bottom: 36px;
    right: 36px;
    width: 48px;
    height: 48px;
    background: var(--blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    z-index: 900;
    box-shadow: 0 4px 16px rgba(26,108,181,0.4);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition), transform var(--transition), background var(--transition);
    pointer-events: none;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover { background: var(--blue-bright); transform: translateY(-3px); }

/* ===== SCROLL ANIMATIONS ===== */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

[data-aos][data-aos-delay="50"] { transition-delay: 0.05s; }
[data-aos][data-aos-delay="100"] { transition-delay: 0.1s; }
[data-aos][data-aos-delay="150"] { transition-delay: 0.15s; }
[data-aos][data-aos-delay="200"] { transition-delay: 0.2s; }
[data-aos][data-aos-delay="300"] { transition-delay: 0.3s; }

/* AOS fade-right / fade-left */
[data-aos="fade-right"] { transform: translateX(-30px); }
[data-aos="fade-left"] { transform: translateX(30px); }
[data-aos="fade-right"].aos-animate,
[data-aos="fade-left"].aos-animate { transform: translateX(0); opacity: 1; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1100px) {
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .materials-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
    .gnb, .btn-inquiry, .lang-toggle { display: none; }
    .hamburger { display: flex; }

    .business-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
    .about-grid { grid-template-columns: 1fr; }
    .about-visual { max-width: 400px; margin: 0 auto; }
    .about-img-box { margin-bottom: 48px; }
    .about-img-inner { padding-bottom: 80%; }
    .about-tag-1, .about-tag-2 { display: none; }
    .cta-inner { grid-template-columns: 1fr; gap: 48px; }
    .cta-info { grid-template-columns: 1fr 1fr; }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .industry-grid { grid-template-columns: repeat(2, 1fr); }
    .intro-strip-grid { grid-template-columns: repeat(2, 1fr); }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
    .hero-content { padding: 0 24px; }
    .hero-title { font-size: 1.8rem; }
    .hero-desc { font-size: 0.9rem; }
    .hero-btns { gap: 12px; }
    .scroll-indicator { display: none; }
    .about-strengths { grid-template-columns: 1fr; }
    .product-tabs { flex-direction: column; width: 100%; }
    .product-grid { grid-template-columns: 1fr; }
    .industry-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .materials-grid { grid-template-columns: repeat(2, 1fr); }
    .intro-strip-grid { grid-template-columns: repeat(2, 1fr); }
    .cta-info { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .business, .about-section, .products-section, .tech-section,
    .industries-section, .cta-section { padding: 80px 0; }
    .section-header { margin-bottom: 40px; }
    .back-to-top { bottom: 20px; right: 20px; }
}