/* ============================================
   CSS Variables & Design Tokens
   ============================================ */
:root {
    --color-primary: #E8772E;
    --color-primary-dark: #C45F1F;
    --color-primary-light: #FFF3EB;
    --color-secondary: #2D5016;
    --color-bg: #FFFFFF;
    --color-surface: #F8F9FA;
    --color-text: #1A1A2E;
    --color-muted: #6B7280;
    --color-border: #E5E7EB;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;

    --font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;

    --container-max: 1400px;
    --section-spacing: 80px;
    --container-padding: 24px;

    --radius-btn: 8px;
    --radius-card: 12px;
    --radius-img: 8px;

    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.12);

    --transition-base: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-base);
}

ul {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 700;
    color: var(--color-text);
}

h1 { font-size: 48px; line-height: 1.2; }
h2 { font-size: 28px; font-weight: 600; line-height: 1.35; }
h3 { font-size: 20px; font-weight: 600; line-height: 1.4; }
h4 { font-size: 16px; font-weight: 600; }

p {
    color: var(--color-muted);
    line-height: 1.7;
}

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

/* ============================================
   Layout
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--section-spacing) 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 48px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.section-title {
    margin-bottom: 16px;
}

.section-desc {
    font-size: 16px;
    color: var(--color-muted);
}

.section-cta {
    text-align: center;
    margin-top: 40px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    padding: 14px 28px;
    border-radius: var(--radius-btn);
    transition: all var(--transition-base);
    white-space: nowrap;
    min-height: 44px;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(232, 119, 46, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 14px;
}

.btn-block {
    width: 100%;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
}

.logo-icon {
    font-size: 28px;
}

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

.nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    border-radius: 6px;
    transition: all var(--transition-base);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

.nav-arrow {
    transition: transform var(--transition-base);
}

.nav-dropdown:hover .nav-arrow {
    transform: rotate(180deg);
}

/* Dropdown */
.nav-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card-hover);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition-base);
    padding: 8px;
    z-index: 100;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--color-text);
    border-radius: 6px;
    transition: all var(--transition-base);
}

.dropdown-menu a:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-muted);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    transition: all var(--transition-base);
}

.lang-switch:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.lang-current {
    color: var(--color-primary);
    font-weight: 600;
}

.lang-divider {
    color: var(--color-border);
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    align-items: center;
}

.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ============================================
   Mobile Menu
   ============================================ */
.mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-menu.active .mobile-menu-overlay {
    opacity: 1;
}

.mobile-menu-panel {
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    max-width: 85vw;
    height: 100%;
    background: #fff;
    padding: 24px;
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
}

.mobile-menu.active .mobile-menu-panel {
    transform: translateX(0);
}

.mobile-close {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 28px;
    color: var(--color-muted);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav-list {
    margin-top: 48px;
}

.mobile-nav-link {
    display: block;
    padding: 14px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-link.active {
    color: var(--color-primary);
}

.mobile-sub-list {
    padding-left: 16px;
}

.mobile-sub-list a {
    display: block;
    padding: 10px 0;
    font-size: 14px;
    color: var(--color-muted);
}

.mobile-cta {
    margin-top: 24px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 72px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.75) 0%, rgba(26, 26, 46, 0.4) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
    padding: 60px 0;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(232, 119, 46, 0.2);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border-radius: 20px;
    margin-bottom: 24px;
    backdrop-filter: blur(4px);
}

.hero-title {
    color: #fff;
    font-size: 52px;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.hero-actions .btn-outline {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.4);
}

.hero-actions .btn-outline:hover {
    border-color: #fff;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.hero-stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
}

.stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ============================================
   Products Section
   ============================================ */
.section-products {
    background: var(--color-bg);
}

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

.product-card {
    background: #fff;
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-base);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.product-img-wrap {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4 / 3;
}

#section-hot-products .product-img-wrap {
    aspect-ratio: unset;
    height: 480px;
}

.product-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

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

.product-info {
    padding: 20px;
}

.product-category {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.product-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.product-desc {
    font-size: 14px;
    color: var(--color-muted);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    transition: all var(--transition-base);
}

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

/* ============================================
   Custom Section
   ============================================ */
.section-custom {
    background: var(--color-surface);
}

.custom-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.custom-content .section-title {
    margin-bottom: 20px;
}

.custom-desc {
    font-size: 16px;
    color: var(--color-muted);
    margin-bottom: 28px;
    line-height: 1.8;
}

.custom-features {
    margin-bottom: 32px;
}

.custom-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 15px;
    color: var(--color-text);
    font-weight: 500;
}

.feature-icon {
    flex-shrink: 0;
}

.custom-visual {
    position: relative;
}

.custom-img-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 16px;
    height: 420px;
}

.custom-img-item {
    border-radius: var(--radius-card);
    overflow: hidden;
}

.custom-img-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.custom-img-item.large {
    grid-row: 1 / 3;
}

.custom-video {
    width: 100%;
    height: 420px;
    object-fit: cover;
    border-radius: var(--radius-card);
}

/* ============================================
   Factory Section
   ============================================ */
.section-factory {
    background: var(--color-bg);
}

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

.factory-card {
    position: relative;
    border-radius: var(--radius-card);
    overflow: hidden;
    aspect-ratio: 3 / 2;
    cursor: pointer;
}

.factory-card img,
.factory-card video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.factory-card:hover img,
.factory-card:hover video {
    transform: scale(1.08);
}

.factory-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px 20px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: #fff;
    font-size: 14px;
    font-weight: 600;
}

/* ============================================
   About Brief Section
   ============================================ */
.section-about-brief {
    background: var(--color-surface);
}

.about-brief-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-brief-content .section-title {
    margin-bottom: 20px;
}

.about-text {
    font-size: 16px;
    color: var(--color-muted);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-brief-content .btn {
    margin-top: 12px;
}

.about-values {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.value-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: #fff;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-base);
}

.value-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-card-hover);
}

.value-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    border-radius: 12px;
}

.value-card h4 {
    margin-bottom: 4px;
    font-size: 16px;
}

.value-card p {
    font-size: 14px;
    color: var(--color-muted);
}

/* ============================================
   Contact Section
   ============================================ */
.section-contact {
    background: var(--color-bg);
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    border-radius: 12px;
}

.contact-detail h4 {
    margin-bottom: 4px;
    font-size: 15px;
}

.contact-detail p {
    font-size: 14px;
    color: var(--color-muted);
}

.contact-form-wrap {
    background: var(--color-surface);
    border-radius: var(--radius-card);
    padding: 36px;
}

.contact-form h3 {
    margin-bottom: 24px;
    font-size: 22px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-btn);
    background: #fff;
    color: var(--color-text);
    transition: all var(--transition-base);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(232, 119, 46, 0.1);
}

.form-group input.error,
.form-group textarea.error {
    border-color: var(--color-error);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-privacy {
    text-align: center;
    font-size: 13px;
    color: var(--color-muted);
    margin-top: 12px;
}

.form-success {
    text-align: center;
    padding: 24px;
    color: var(--color-success);
    font-weight: 600;
    display: none;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo .logo-text {
    color: #fff;
}

.footer-logo .logo-icon {
    font-size: 24px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 16px;
    line-height: 1.7;
    max-width: 320px;
}

.footer-links h4,
.footer-contact h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition-base);
}

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

.footer-contact p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 6px;
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.35);
}

/* ============================================
   Scroll Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive: Tablet
   ============================================ */
@media (max-width: 1199px) {
    :root {
        --section-spacing: 60px;
    }

    h1 { font-size: 40px; }
    .hero-title { font-size: 42px; }

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

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

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

/* ============================================
   Responsive: Mobile
   ============================================ */
@media (max-width: 767px) {
    :root {
        --section-spacing: 48px;
        --container-padding: 16px;
    }

    h1 { font-size: 32px; }
    h2 { font-size: 24px; }

    .header-cta {
        display: none;
    }

    .nav, .lang-switch {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 18px;
    }

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

    .custom-layout,
    .about-brief-layout,
    .contact-layout {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .custom-img-grid {
        height: 280px;
    }

    .custom-video {
        height: 280px;
    }

    .factory-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

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

    .contact-form-wrap {
        padding: 24px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .section-header {
        margin-bottom: 32px;
    }
}

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}

/* ============================================
   Focus Styles (Accessibility)
   ============================================ */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}