/* ============================================================
   Lianmeng Machinery — B2B Industrial Website
   Makwell-style design: Professional, Trust-building, Conversion-focused
   ============================================================ */

/* ----- Reset & Variables ----- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --blue: #1a56db;
    --blue-dark: #1e40af;
    --blue-light: #dbeafe;
    --blue-bg: #eff6ff;
    --orange: #f59e0b;
    --orange-dark: #d97706;
    --text: #1f2937;
    --text-secondary: #4b5563;
    --text-light: #9ca3af;
    --white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
    --radius: 6px;
    --radius-lg: 10px;
    --transition: all 0.25s ease;
    --max-width: 1280px;
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    padding-top: 128px;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* ----- Top Bar ----- */
.top-bar {
    background: #0f172a;
    color: rgba(255,255,255,0.8);
    font-size: 0.8125rem;
    padding: 8px 0;
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1001;
}
.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.top-bar-left { display: flex; gap: 24px; }
.top-bar a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}
.top-bar a:hover { color: var(--white); }
.whatsapp-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: #25d366;
    color: white !important;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 500;
}
.whatsapp-link:hover { background: #20b858; }

/* ----- Header ----- */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: fixed;
    top: 34px; left: 0; right: 0;
    z-index: 1000;
    transition: var(--transition);
}
.header.scrolled { box-shadow: var(--shadow); }
.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-name { font-size: 1.125rem; font-weight: 700; color: var(--text); }
.logo-sub { font-size: 0.75rem; font-weight: 500; color: var(--blue); letter-spacing: 0.05em; text-transform: uppercase; }

/* Main Nav */
.main-nav ul { display: flex; gap: 4px; }
.main-nav > ul > li { position: relative; }
.main-nav > ul > li > a {
    display: block;
    padding: 10px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius);
    transition: var(--transition);
}
.main-nav > ul > li > a:hover,
.main-nav > ul > li > a.active {
    color: var(--blue);
    background: var(--blue-light);
}

/* Dropdown */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: var(--transition);
    z-index: 100;
}
.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-menu li a {
    display: block;
    padding: 10px 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: var(--transition);
}
.dropdown-menu li a:hover {
    color: var(--blue);
    background: var(--blue-light);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}
.btn-primary {
    background: var(--orange);
    color: var(--white);
}
.btn-primary:hover {
    background: var(--orange-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.btn-quote {
    background: var(--blue);
    color: var(--white);
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 600;
}
.btn-quote:hover { background: var(--blue-dark); }
.btn-outline-white {
    border: 2px solid rgba(255,255,255,0.4);
    color: var(--white);
}
.btn-outline-white:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
}
.btn-full { width: 100%; justify-content: center; }

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 4px;
}
.mobile-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 106px;
    left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 20px;
    z-index: 999;
    box-shadow: var(--shadow-lg);
}
.mobile-menu.active { display: block; }
.mobile-menu ul { display: flex; flex-direction: column; gap: 4px; margin-bottom: 16px; }
.mobile-menu a {
    display: block;
    padding: 12px 16px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius);
    color: var(--text-secondary);
}
.mobile-menu a:hover { color: var(--blue); background: var(--blue-light); }

/* ===== HERO SLIDER ===== */
.hero-slider {
    position: relative;
    height: 520px;
    overflow: hidden;
    margin-top: -34px;
}
.hero-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 0.8s ease;
}
.hero-slide.active { opacity: 1; z-index: 1; }
.hero-content {
    max-width: 680px;
    color: var(--white);
}
.hero-tag {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.7);
    margin-bottom: 12px;
}
.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}
.hero-desc {
    font-size: 1.0625rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.7;
    margin-bottom: 28px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero Navigation */
.hero-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    width: 48px; height: 48px;
    border-radius: 50%;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.hero-arrow:hover { background: rgba(255,255,255,0.3); }
.hero-prev { left: 24px; }
.hero-next { right: 24px; }
.hero-dots {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    gap: 10px;
}
.hero-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}
.hero-dot.active { background: var(--white); width: 28px; border-radius: 5px; }

/* ===== SECTIONS ===== */
.section { padding: 80px 0; }
.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}
.section-header p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}
.bg-light { background: var(--bg-light); }

/* ===== PRODUCT CARDS (Home) ===== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.product-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}
.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--blue);
}
.product-img {
    background: var(--bg-light);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.product-card:hover .product-img img {
    transform: scale(1.05);
}
.img-placeholder {
    font-size: 4rem;
    opacity: 0.8;
}
.product-info { padding: 20px 24px 24px; }
.product-info h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
    color: var(--text);
}
.product-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
}
.link-arrow {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--blue);
    transition: var(--transition);
}
.link-arrow:hover { color: var(--blue-dark); }

/* ===== SOLUTIONS (Home) ===== */
.solutions-home { background: var(--bg-light); }
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.solution-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-align: center;
    transition: var(--transition);
}
.solution-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--blue);
    transform: translateY(-2px);
}
.solution-icon { font-size: 2.5rem; margin-bottom: 12px; display: block; }
.solution-card h3 { font-size: 1.0625rem; font-weight: 600; margin-bottom: 8px; }
.solution-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; }

/* ===== WHY US ===== */
.why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.why-card {
    text-align: center;
    padding: 32px 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}
.why-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--blue);
}
.why-icon { font-size: 2.5rem; margin-bottom: 16px; display: block; }
.why-card h3 { font-size: 1.0625rem; font-weight: 600; margin-bottom: 10px; }
.why-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== TESTIMONIALS ===== */
.testimonials { background: var(--bg-light); }
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.testimonial-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-md); }
.testimonial-stars { color: #f59e0b; font-size: 1rem; margin-bottom: 12px; }
.testimonial-card > p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    font-style: italic;
    margin-bottom: 16px;
}
.testimonial-author strong { display: block; font-size: 0.9375rem; font-weight: 600; }
.testimonial-author span { font-size: 0.8125rem; color: var(--text-light); }

/* ===== FACTORY ===== */
.factory-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.factory-item {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    aspect-ratio: 4/3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: var(--transition);
}
.factory-item:hover { border-color: var(--blue); box-shadow: var(--shadow-md); }
.factory-item span { font-size: 3rem; }
.factory-item p { font-size: 0.9375rem; font-weight: 500; color: var(--text-secondary); }

/* ===== INQUIRY ===== */
.inquiry { background: linear-gradient(135deg, var(--blue-dark), var(--blue)); }
.inquiry-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.inquiry-info {
    padding: 48px 40px;
    background: var(--blue);
    color: var(--white);
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.inquiry-info h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 12px; }
.inquiry-info > p { color: rgba(255,255,255,0.8); line-height: 1.6; margin-bottom: 24px; }
.inquiry-benefits { display: flex; flex-direction: column; gap: 10px; }
.benefit-item { font-size: 0.9375rem; color: rgba(255,255,255,0.9); }

.inquiry-form {
    padding: 48px 40px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.inquiry-form input,
.inquiry-form select,
.inquiry-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    color: var(--text);
    background: var(--white);
    transition: var(--transition);
}
.inquiry-form input:focus,
.inquiry-form select:focus,
.inquiry-form textarea:focus {
    outline: none;
    border-color: var(--blue);
    box-shadow: 0 0 0 3px var(--blue-light);
}
.inquiry-form input::placeholder,
.inquiry-form textarea::placeholder { color: var(--text-light); }
.inquiry-form textarea { resize: vertical; min-height: 100px; }

/* ===== FAQ ===== */
.faq { background: var(--bg-light); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 8px; }
.faq-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.faq-question {
    width: 100%;
    text-align: left;
    padding: 18px 24px;
    font-size: 1rem;
    font-weight: 600;
    background: none;
    border: none;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}
.faq-question::after { content: '+'; font-size: 1.25rem; font-weight: 400; color: var(--blue); }
.faq-item.active .faq-question::after { content: '−'; }
.faq-question:hover { color: var(--blue); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 24px 18px;
}
.faq-answer p { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== CTA BANNER ===== */
.cta-banner {
    background: linear-gradient(135deg, var(--blue-dark), var(--blue));
    text-align: center;
    color: var(--white);
}
.cta-banner h2 { font-size: 2rem; font-weight: 700; margin-bottom: 12px; }
.cta-banner p { color: rgba(255,255,255,0.8); font-size: 1.0625rem; margin-bottom: 24px; }
.cta-banner .btn-primary { background: var(--orange); }
.cta-banner .btn-primary:hover { background: var(--orange-dark); }

/* ===== PAGE BANNER ===== */
.page-banner {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
    padding: 72px 0 56px;
    text-align: center;
    color: var(--white);
}
.breadcrumb { font-size: 0.875rem; color: rgba(255,255,255,0.5); margin-bottom: 8px; }
.breadcrumb a { color: rgba(255,255,255,0.6); }
.breadcrumb a:hover { color: var(--white); }
.page-banner h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 8px; }
.page-banner p { font-size: 1.0625rem; color: rgba(255,255,255,0.6); }

/* ===== PRODUCT DETAIL ROW ===== */
.product-detail-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}
.product-detail-row:last-child { border-bottom: none; }
.product-detail-row.reverse .product-detail-img { order: 2; }
.product-detail-row.reverse .product-detail-info { order: 1; }
.product-detail-img {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}
.img-placeholder-lg { font-size: 6rem; opacity: 0.7; }
.product-detail-info h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 16px; line-height: 1.3; }
.product-detail-desc { color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.feature-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }
.feature-list li {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    padding-left: 24px;
    position: relative;
}
.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--blue);
    font-weight: 700;
}

/* ===== SOLUTION DETAIL ROW ===== */
.solution-detail-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}
.solution-detail-row:last-child { border-bottom: none; }
.solution-detail-row.reverse .solution-detail-img { order: 2; }
.solution-detail-row.reverse .solution-detail-info { order: 1; }
.solution-detail-img {
    background: var(--blue-bg);
    border-radius: var(--radius-lg);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}
.solution-detail-img span { font-size: 5rem; }
.solution-detail-info h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 16px; }
.solution-detail-info p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }

/* ===== ABOUT PAGE ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}
.about-text h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 20px; }
.about-text p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; font-size: 1rem; }
.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.stat-item {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}
.stat-item:hover { border-color: var(--blue); box-shadow: var(--shadow-md); }
.stat-num { display: block; font-size: 2.25rem; font-weight: 800; color: var(--blue); margin-bottom: 4px; }
.stat-label { font-size: 0.875rem; color: var(--text-secondary); font-weight: 500; }

/* Mission */
.mission-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.mission-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
}
.mission-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.mission-icon { font-size: 3rem; margin-bottom: 16px; display: block; }
.mission-card h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 12px; }
.mission-card p { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== CONTACT PAGE ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
}
.contact-form-col h2,
.contact-info-col h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 8px; }
.contact-form-col > p,
.contact-info-col > p { color: var(--text-secondary); margin-bottom: 24px; }

.contact-info-list { display: flex; flex-direction: column; gap: 20px; }
.ci-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.ci-icon {
    width: 44px; height: 44px;
    background: var(--blue-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}
.ci-item h4 { font-size: 0.9375rem; font-weight: 600; margin-bottom: 2px; }
.ci-item p { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.5; }

/* ===== FOOTER ===== */
.footer {
    background: #0f172a;
    color: var(--white);
    padding: 56px 0 24px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.3fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--white);
}
.footer-about p {
    font-size: 0.875rem;
    color: var(--text-light);
    line-height: 1.7;
}
.footer-col h4 {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-light);
    margin-bottom: 14px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col a {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.55);
    transition: var(--transition);
}
.footer-col a:hover { color: var(--white); }
.footer-contact-list li {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.55);
}
.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
    text-align: center;
}
.footer-bottom p { font-size: 0.8125rem; color: var(--text-light); }

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: var(--blue);
    color: white;
    border: none;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 99;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--blue-dark); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonial-grid { grid-template-columns: 1fr; }
    .inquiry-wrapper { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    body { padding-top: 106px; }
    .top-bar-left { gap: 12px; font-size: 0.75rem; }
    .main-nav { display: none; }
    .header .btn-quote { display: none; }
    .mobile-toggle { display: flex; }

    .hero-slider { height: auto; min-height: 420px; }
    .hero-content { padding: 60px 0; }
    .hero-content h1 { font-size: 1.625rem; }
    .hero-arrow { display: none; }

    .section { padding: 56px 0; }
    .section-header h2 { font-size: 1.625rem; }

    .product-grid { grid-template-columns: 1fr; }
    .solutions-grid { grid-template-columns: 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .factory-grid { grid-template-columns: repeat(2, 1fr); }
    .mission-grid { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; gap: 32px; }
    .about-stats { grid-template-columns: 1fr 1fr; }

    .product-detail-row,
    .solution-detail-row {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .product-detail-row.reverse .product-detail-img,
    .solution-detail-row.reverse .solution-detail-img { order: -1; }

    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .inquiry-info { padding: 32px 24px; }
    .inquiry-form { padding: 32px 24px; }
    .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .hero-content h1 { font-size: 1.375rem; }
    .hero-btns { flex-direction: column; }
    .hero-btns .btn { width: 100%; }
    .about-stats { grid-template-columns: 1fr; }
    .factory-grid { grid-template-columns: 1fr; }
    .page-banner h1 { font-size: 1.75rem; }
}