/* ============================================
   HAUSTEEL — Main Stylesheet
   Brand color: #8B1A1A (dark crimson red)
   ============================================ */

:root {
    --red:        #8B1A1A;
    --red-dark:   #6B1212;
    --red-light:  #A52020;
    --dark:       #111111;
    --dark-2:     #1e1e1e;
    --dark-3:     #2a2a2a;
    --gray:       #666;
    --gray-light: #999;
    --border:     #e8e8e8;
    --bg-light:   #f6f6f6;
    --white:      #ffffff;
    --shadow-sm:  0 2px 12px rgba(0,0,0,0.08);
    --shadow-md:  0 6px 30px rgba(0,0,0,0.12);
    --shadow-lg:  0 16px 60px rgba(0,0,0,0.18);
    --ease:       cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 0.3s var(--ease);
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Noto Sans KR', 'Montserrat', sans-serif;
    color: var(--dark);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ---- TYPOGRAPHY ---- */
h1, h2, h3, h4, h5 {
    font-family: 'Montserrat', 'Noto Sans KR', sans-serif;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

/* ---- CONTAINER ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 48px; }

/* ---- SECTION BASE ---- */
section { padding: 110px 0; }
.bg-light  { background: var(--bg-light); }
.bg-dark   { background: var(--dark); color: var(--white); }

/* ---- SECTION HEADER ---- */
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag {
    display: inline-block;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--red);
    margin-bottom: 14px;
}
.section-tag.light { color: rgba(255,255,255,0.45); }
.section-title {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    color: var(--dark);
    font-weight: 800;
}
.section-title.light { color: var(--white); }
.section-desc {
    margin-top: 18px;
    color: var(--gray);
    font-size: 1rem;
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

/* ---- BUTTONS ---- */
.btn {
    display: inline-block;
    padding: 14px 36px;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border: 2px solid transparent;
    transition: all var(--transition);
    white-space: nowrap;
}
.btn-primary {
    background: var(--red);
    color: var(--white);
    border-color: var(--red);
}
.btn-primary:hover {
    background: var(--red-dark);
    border-color: var(--red-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139,26,26,0.35);
}
.btn-outline {
    background: transparent;
    color: var(--red);
    border-color: var(--red);
}
.btn-outline:hover {
    background: var(--red);
    color: var(--white);
    transform: translateY(-2px);
}
.btn-outline-white {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.55);
}
.btn-outline-white:hover {
    background: var(--white);
    color: var(--dark);
    border-color: var(--white);
}
.btn-full { width: 100%; text-align: center; }

/* ---- SCROLL ANIMATION ---- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}
.animate-on-scroll.visible {
    opacity: 1;
    transform: none;
}

/* ==============================================
   NAVIGATION
   ============================================== */
#header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 900;
}
.navbar {
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.07);
    transition: box-shadow var(--transition);
}
#header.scrolled .navbar { box-shadow: var(--shadow-md); }

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 48px;
    height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 0px;
    flex-shrink: 0;
}
.logo-img {
    height: 76px;
    width: auto;
    object-fit: contain;
    mix-blend-mode: multiply;
}
.logo-text {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--red);
    letter-spacing: 0.12em;
}
.nav-menu {
    display: flex;
    gap: 4px;
}
.nav-link {
    display: block;
    padding: 8px 16px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--dark-3);
    transition: color var(--transition);
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px; left: 16px; right: 16px;
    height: 2px;
    background: var(--red);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform var(--transition);
}
.nav-link:hover { color: var(--red); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-right { display: flex; align-items: center; gap: 20px; }

.lang-toggle { display: flex; align-items: center; gap: 6px; }
.lang-divider { color: var(--border); font-size: 0.9rem; }
.lang-btn {
    background: none;
    border: none;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--gray-light);
    padding: 2px;
    transition: color var(--transition);
}
.lang-btn.active, .lang-btn:hover { color: var(--red); }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 4px;
}
.hamburger span {
    display: block;
    width: 22px; height: 2px;
    background: var(--dark);
    transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==============================================
   HERO
   ============================================== */
#hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 0;
}
.hero-bg {
    position: absolute; inset: 0;
    background:
        linear-gradient(160deg, #0d0d0d 0%, #1a1a1a 45%, #120000 100%);
}
.hero-bg::before {
    content: '';
    position: absolute; inset: 0;
    background-image:
        repeating-linear-gradient(90deg, rgba(255,255,255,0.022) 0, rgba(255,255,255,0.022) 1px, transparent 0, transparent 50%),
        repeating-linear-gradient(0deg,  rgba(255,255,255,0.022) 0, rgba(255,255,255,0.022) 1px, transparent 0, transparent 50%);
    background-size: 64px 64px;
}
.hero-overlay {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 60% 50%, rgba(139,26,26,0.18) 0%, transparent 65%);
}
.hero-content {
    position: relative; z-index: 2;
    text-align: center;
    color: var(--white);
    max-width: 820px;
    padding: 120px 48px 0;
}
.hero-eyebrow {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.45);
    margin-bottom: 22px;
}
.hero-title {
    font-size: clamp(3.5rem, 9vw, 7rem);
    font-weight: 900;
    letter-spacing: 0.12em;
    line-height: 1;
    margin-bottom: 24px;
    color: var(--white);
}
.hero-title span { color: var(--red); }
.hero-desc {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: rgba(255,255,255,0.6);
    font-weight: 300;
    letter-spacing: 0.04em;
    margin-bottom: 44px;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.hero-scroll {
    position: absolute; bottom: 44px; left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    color: rgba(255,255,255,0.3);
    transition: color var(--transition);
    animation: scrollBounce 2.5s ease-in-out infinite;
}
.hero-scroll:hover { color: rgba(255,255,255,0.7); }
@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%       { transform: translateX(-50%) translateY(10px); }
}

/* ==============================================
   ABOUT
   ============================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}
.about-text p {
    color: var(--gray);
    margin-bottom: 20px;
    font-size: 1rem;
    line-height: 1.9;
}
.about-text .btn { margin-top: 12px; }
.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.stat-item {
    padding: 32px 24px;
    background: var(--white);
    border-bottom: 3px solid var(--red);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}
.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.stat-number {
    display: block;
    font-family: 'Montserrat', sans-serif;
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--red);
    line-height: 1;
    margin-bottom: 10px;
}
.stat-plus { font-size: 1.8rem; }
.stat-label { font-size: 0.85rem; color: var(--gray); font-weight: 500; }

/* ==============================================
   PRODUCTS
   ============================================== */
.products-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}
.product-card {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.product-image {
    position: relative;
    height: 280px;
    background: linear-gradient(145deg, #1a1a1a, #2e2e2e);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.product-image-steel {
    background: linear-gradient(145deg, #0f0505, #2a1010);
}
.product-image img {
    width: 100%; height: 100%;
    object-fit: cover;
    position: absolute; inset: 0;
}
.product-image.no-img img { display: none; }
.product-img-fallback {
    color: rgba(255,255,255,0.15);
    width: 80px; height: 80px;
}
.product-image.no-img .product-img-fallback { display: flex; }
.product-img-fallback { display: none; }
.product-image:not(.no-img) .product-img-fallback { display: none; }

.product-tag {
    position: absolute;
    top: 20px; left: 20px;
    background: var(--red);
    color: var(--white);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 5px 12px;
}
.product-body { padding: 36px 36px 40px; }
.product-body h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--dark);
}
.product-body p {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 22px;
}
.product-features { margin-bottom: 28px; }
.product-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.92rem;
    color: var(--dark-3);
}
.product-features li::before {
    content: '';
    width: 5px; height: 5px;
    background: var(--red);
    border-radius: 50%;
    flex-shrink: 0;
}

/* ==============================================
   CERTIFICATIONS
   ============================================== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}
.cert-card {
    text-align: center;
    padding: 44px 24px 36px;
    border: 1px solid var(--border);
    background: var(--white);
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.cert-card:hover {
    border-color: var(--red);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}
.cert-image-wrap {
    width: 80px; height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.cert-image-wrap img {
    width: 100%; height: 100%;
    object-fit: contain;
}
.cert-image-wrap.no-img img { display: none; }
.cert-img-fallback {
    width: 60px; height: 60px;
    color: var(--red);
}
.cert-image-wrap:not(.no-img) .cert-img-fallback { display: none; }
.cert-image-wrap.no-img .cert-img-fallback { display: block; }

.cert-card h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.cert-card p  { font-size: 0.82rem; color: var(--gray); line-height: 1.5; }

/* ==============================================
   CONTACT
   ============================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 70px;
    align-items: start;
}

/* Floating label form */
.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group {
    position: relative;
    margin-bottom: 16px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 20px 18px 10px;
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.15);
    color: var(--white);
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition), background var(--transition);
    appearance: none;
    -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--red);
    background: rgba(255,255,255,0.1);
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-group label {
    position: absolute;
    top: 50%; left: 18px;
    transform: translateY(-50%);
    font-size: 0.9rem;
    color: rgba(255,255,255,0.35);
    pointer-events: none;
    transition: all 0.2s var(--ease);
}
.form-group textarea ~ label { top: 20px; transform: none; }
.form-group select ~ label { top: 50%; transform: translateY(-50%); }
.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: 10px;
    transform: none;
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    color: rgba(255,255,255,0.4);
}
.form-group select:focus ~ label,
.form-group select:valid ~ label {
    top: 10px;
    transform: none;
    font-size: 0.72rem;
    color: rgba(255,255,255,0.4);
}
.form-group select option {
    background: var(--dark-2);
    color: var(--white);
}
.form-success {
    display: none;
    margin-top: 14px;
    color: #5cb85c;
    font-size: 0.9rem;
    text-align: center;
}
.form-success.show { display: block; }

/* Contact info */
.contact-info { padding-top: 8px; }
.info-block { display: flex; flex-direction: column; gap: 28px; }
.info-item { display: flex; gap: 16px; align-items: flex-start; }
.info-icon {
    width: 22px; height: 22px;
    flex-shrink: 0;
    margin-top: 3px;
    color: rgba(255,255,255,0.4);
}
.info-item strong {
    display: block;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.35);
    margin-bottom: 5px;
}
.info-item p {
    color: rgba(255,255,255,0.8);
    font-size: 0.95rem;
    line-height: 1.65;
}
.info-item a { color: rgba(255,255,255,0.8); transition: color var(--transition); }
.info-item a:hover { color: var(--red); }

/* ==============================================
   LOCATION
   ============================================== */
.location-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 44px;
    align-items: start;
}
.map-wrap {
    height: 460px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.map-wrap iframe { width: 100%; height: 100%; border: 0; display: block; }

.location-info { display: flex; flex-direction: column; gap: 32px; }
.location-item h4 {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--red);
    margin-bottom: 10px;
}
.location-item p {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.75;
}
.postal { color: var(--gray-light); font-size: 0.88rem; }

/* ==============================================
   FOOTER
   ============================================== */
footer {
    background: #0a0a0a;
    color: rgba(255,255,255,0.45);
    padding-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 60px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.07);
}
.footer-logo {
    height: 38px; width: auto;
    filter: brightness(0) invert(1);
    opacity: 0.55;
    margin-bottom: 12px;
}
.footer-company-name {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.1rem;
    font-weight: 800;
    color: rgba(255,255,255,0.7);
    letter-spacing: 0.12em;
    margin-bottom: 8px;
}
.footer-tagline { font-size: 0.88rem; line-height: 1.6; }

.footer-nav h5,
.footer-contact-info h5 {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
    margin-bottom: 20px;
}
.footer-nav ul { display: flex; flex-direction: column; gap: 11px; }
.footer-nav a {
    font-size: 0.9rem;
    transition: color var(--transition);
}
.footer-nav a:hover { color: var(--red); }
.footer-contact-info p { font-size: 0.9rem; margin-bottom: 8px; }
.footer-contact-info a { transition: color var(--transition); }
.footer-contact-info a:hover { color: var(--red); }

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 0.82rem;
}

/* ==============================================
   RESPONSIVE — Tablet (≤ 1024px)
   ============================================== */
@media (max-width: 1024px) {
    .container { padding: 0 32px; }
    .nav-container { padding: 0 32px; }
    section { padding: 80px 0; }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .cert-grid { grid-template-columns: repeat(2, 1fr); }
    .location-grid { grid-template-columns: 1fr; }
    .map-wrap { height: 380px; }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
    .footer-brand { grid-column: 1 / -1; }
}

/* ==============================================
   RESPONSIVE — Mobile (≤ 768px)
   ============================================== */
@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .nav-container { padding: 0 20px; }
    section { padding: 64px 0; }

    /* Mobile nav */
    .nav-menu {
        display: none;
        position: absolute;
        top: 76px; left: 0; right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 12px 0 20px;
        border-top: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }
    .nav-menu.open { display: flex; }
    .nav-link { padding: 12px 24px; }
    .nav-link::after { display: none; }
    .hamburger { display: flex; }

    /* Hero */
    .hero-title { font-size: clamp(2.8rem, 12vw, 4.5rem); }
    .hero-content { padding-top: 100px; }

    /* Products */
    .products-grid { grid-template-columns: 1fr; }

    /* Contact */
    .contact-grid { grid-template-columns: 1fr; gap: 48px; }
    .contact-form .form-row { grid-template-columns: 1fr; }

    /* Footer */
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-brand { grid-column: auto; }
}

@media (max-width: 480px) {
    .hero-buttons { flex-direction: column; align-items: center; }
    .about-stats { grid-template-columns: 1fr 1fr; }
    .cert-grid { grid-template-columns: 1fr 1fr; }
}