@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Noto+Serif+SC:wght@400;500;700&family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    /* 中式配色 - 墨韵风格 */
    --primary: #C73E3A;       /* 朱砂红 */
    --primary-dark: #8B2500;   /* 绛红 */
    --primary-light: #E87070;  /* 浅朱 */
    --accent: #C5973E;         /* 琥珀金 */
    --accent-alt: #2E8B57;      /* 玉绿 */
    --dark: #1A1814;           /* 墨色 */
    --dark-secondary: #2A2520; /* 褐墨 */
    --dark-tertiary: #3A3530;  /* 浅墨 */
    --gray-100: #F5F0E6;       /* 宣纸白 */
    --gray-200: #E8E0D0;        /* 旧纸色 */
    --gray-300: #C9BBA0;        /* 淡褐 */
    --gray-400: #8B7355;       /* 赭石 */
    --gray-500: #5C4A3A;       /* 棕褐 */
    --white: #F5F0E6;           /* 宣纸白 */
    --gradient-primary: linear-gradient(135deg, #C73E3A 0%, #C5973E 100%);
    --gradient-dark: linear-gradient(180deg, #1A1814 0%, #2A2520 100%);
    --gradient-hero: linear-gradient(135deg, rgba(199, 62, 58, 0.12) 0%, rgba(197, 151, 62, 0.08) 50%, rgba(46, 139, 87, 0.06) 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(199, 62, 58, 0.2);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--dark);
    color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

body.mobile-nav-open {
    overflow: hidden;
}

@keyframes pageFadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pageFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes heroGlowFloat {
    0%, 100% {
        transform: translate3d(-8%, -6%, 0) scale(1);
    }

    50% {
        transform: translate3d(8%, 6%, 0) scale(1.08);
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: clamp(36px, 6vw, 64px); }
h2 { font-size: clamp(28px, 4vw, 48px); }
h3 { font-size: clamp(22px, 3vw, 32px); }

/* Nav */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 60px;
    background: rgba(26, 24, 20, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(197, 151, 62, 0.15);
}

.nav.scrolled {
    background: rgba(26, 24, 20, 0.94);
    box-shadow: var(--shadow-md);
}

.nav::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--white);
}

.logo-icon svg {
    width: 42px;
    height: 42px;
}

.logo span {
    font-family: 'Noto Serif SC', serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-100);
    letter-spacing: 4px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links > div, .nav-links > a {
    position: relative;
}

.nav-links a:not(.dropdown-menu a) {
    color: var(--gray-300);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 1px;
    transition: color var(--transition-fast);
    padding: 8px 0;
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-links a.active,
.nav-dropdown > a.active {
    color: var(--accent);
}

.nav-dropdown {
    cursor: pointer;
}

.nav-dropdown > a::after {
    content: ' ▾';
    font-size: 10px;
    opacity: 0.6;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% - 2px);
    left: 50%;
    transform: translateX(-50%) scale(0.98);
    transform-origin: top center;
    min-width: 180px;
    background: var(--dark-secondary);
    border: 1px solid rgba(197, 151, 62, 0.2);
    border-radius: var(--border-radius-md);
    padding: 12px 0;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) scale(1);
}

.dropdown-menu a {
    padding: 10px 20px !important;
    color: var(--gray-300) !important;
    font-size: 14px !important;
    letter-spacing: 0 !important;
}

.dropdown-menu a:hover {
    color: var(--accent) !important;
    background: rgba(197, 151, 62, 0.08) !important;
}

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

.nav-mobile-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(197, 151, 62, 0.25);
    border-radius: var(--border-radius-md);
    background: rgba(42, 37, 32, 0.9);
    color: var(--gray-100);
    cursor: pointer;
    padding: 0;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
    transition: all var(--transition-normal);
}

.nav-mobile-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.nav-mobile-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
    transition: transform var(--transition-normal), opacity var(--transition-fast);
}

body.mobile-nav-open .nav-mobile-toggle span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

body.mobile-nav-open .nav-mobile-toggle span:nth-child(2) {
    opacity: 0;
}

body.mobile-nav-open .nav-mobile-toggle span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.lang-switch {
    display: flex;
    gap: 6px;
    font-size: 13px;
    color: var(--gray-400);
}

.lang-switch a {
    color: var(--gray-400);
    text-decoration: none;
}

.lang-switch a.active {
    color: var(--accent);
}

.lang-switch span {
    color: var(--gray-500);
}

.mobile-menu-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    z-index: 1090;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: min(380px, 100vw);
    height: 100vh;
    padding: 96px 24px 28px;
    background: linear-gradient(180deg, rgba(42, 37, 32, 0.98) 0%, rgba(26, 24, 20, 0.98) 100%);
    border-left: 1px solid rgba(197, 151, 62, 0.15);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 1100;
}

body.mobile-nav-open .mobile-menu-backdrop {
    opacity: 1;
    visibility: visible;
}

body.mobile-nav-open .mobile-menu {
    transform: translateX(0);
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mobile-nav-link,
.mobile-menu summary,
.mobile-submenu a {
    color: var(--gray-100);
    text-decoration: none;
}

.mobile-nav-link {
    display: block;
    padding: 14px 16px;
    border: 1px solid rgba(197, 151, 62, 0.12);
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.02);
    transition: all var(--transition-normal);
}

.mobile-nav-link:hover,
.mobile-submenu a:hover {
    color: var(--accent);
    border-color: rgba(197, 151, 62, 0.25);
}

.mobile-menu-group {
    border: 1px solid rgba(197, 151, 62, 0.12);
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.02);
    overflow: hidden;
}

.mobile-menu summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    font-weight: 600;
}

.mobile-menu summary::-webkit-details-marker {
    display: none;
}

.mobile-menu summary::after {
    content: '+';
    color: var(--accent);
    font-size: 18px;
    transition: transform var(--transition-normal);
}

.mobile-menu details[open] summary::after {
    transform: rotate(45deg);
}

.mobile-submenu {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0 12px 12px;
}

.mobile-submenu a {
    display: block;
    padding: 10px 12px;
    border-radius: var(--border-radius-sm);
    background: rgba(255, 255, 255, 0.03);
    transition: all var(--transition-fast);
}

.mobile-submenu-home {
    font-weight: 600;
}

.mobile-menu-cta {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-top: 4px;
}

.mobile-menu .btn {
    width: 100%;
}

.mobile-menu-language {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--gray-400);
    font-size: 14px;
}

.mobile-menu-language a {
    color: inherit;
    text-decoration: none;
}

.mobile-menu-language a.active {
    color: var(--accent);
}

.mobile-nav-link.active,
.mobile-submenu a.active,
.mobile-menu-group[open] > summary {
    color: var(--accent);
}

.mobile-menu-note {
    font-size: 13px;
    color: var(--gray-500);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    letter-spacing: 1px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--gray-100);
    border: 1px solid rgba(197, 151, 62, 0.3);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
    filter: brightness(1.1);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}

.btn-outline:hover {
    background: rgba(197, 151, 62, 0.1);
    color: var(--accent);
}

.btn-large {
    padding: 14px 36px;
    font-size: 15px;
}

/* Section Common */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    display: inline-block;
    font-family: 'Noto Serif SC', serif;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 6px;
    text-transform: uppercase;
    margin-bottom: 16px;
    position: relative;
}

.section-label::before,
.section-label::after {
    content: '—';
    margin: 0 12px;
    opacity: 0.4;
}

.section-title {
    color: var(--gray-100);
    margin-bottom: 16px;
    font-weight: 700;
}

.section-desc {
    color: var(--gray-400);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

body .page-hero,
body .news-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient-hero);
    border-bottom: 1px solid rgba(197, 151, 62, 0.08);
    isolation: isolate;
}

body .page-hero::after,
body .news-hero::after {
    content: '';
    position: absolute;
    width: min(48vw, 540px);
    height: min(48vw, 540px);
    right: -10%;
    bottom: -28%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(199, 62, 58, 0.18) 0%, rgba(197, 151, 62, 0.12) 45%, transparent 72%);
    filter: blur(24px);
    opacity: 0.9;
    z-index: 0;
    animation: heroGlowFloat 11s ease-in-out infinite;
}

body .page-hero-content,
body .news-hero-content {
    position: relative;
    z-index: 1;
}

body .page-hero-content .section-label,
body .news-tag {
    animation: pageFadeInUp 0.75s ease both;
}

body .page-hero-content h1,
body .news-hero h1 {
    letter-spacing: 4px;
    animation: pageFadeInUp 0.75s ease 0.08s both;
}

body .page-hero-content > p,
body .news-meta {
    animation: pageFadeInUp 0.75s ease 0.16s both;
}

body .page-hero-content > .hero-stats,
body .page-hero-content > .hero-actions {
    animation: pageFadeIn 0.8s ease 0.22s both;
}

body a.featured-main,
body a.featured-side-item {
    display: block;
    color: inherit;
    text-decoration: none;
}

body .animate-in {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

body :is(
    .stat-box,
    .vision-card,
    .honor-card,
    .business-card,
    .culture-card,
    .benefit-card,
    .job-item,
    .location-card,
    .contact-item,
    .office-card,
    .utility-card,
    .sitemap-card,
    .sidebar-card,
    .product-item,
    .solution-card,
    .tech-card-large,
    .patent-stat,
    .contact-form-container,
    .map-placeholder,
    .milestone-content,
    .timeline-content
) {
    transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background var(--transition-normal);
    will-change: transform;
}

body :is(
    .stat-box,
    .vision-card,
    .honor-card,
    .business-card,
    .culture-card,
    .benefit-card,
    .job-item,
    .location-card,
    .contact-item,
    .office-card,
    .utility-card,
    .sitemap-card,
    .sidebar-card,
    .product-item,
    .solution-card,
    .tech-card-large,
    .patent-stat,
    .contact-form-container,
    .map-placeholder,
    .milestone-content,
    .timeline-content
):hover {
    transform: translateY(-6px);
    border-color: rgba(197, 151, 62, 0.22);
    box-shadow: 0 18px 42px rgba(199, 62, 58, 0.12);
}

body :is(
    .contact-item,
    .office-card,
    .solution-card,
    .business-card,
    .culture-card,
    .benefit-card,
    .location-card
):hover :is(
    .contact-item-icon,
    .office-icon,
    .quick-link-icon,
    .governance-icon,
    .solution-icon,
    .business-icon,
    .culture-icon,
    .benefit-icon,
    .location-icon
) {
    transform: scale(1.08) translateY(-2px);
}

body :is(
    .contact-item-icon,
    .office-icon,
    .solution-icon,
    .business-icon,
    .culture-icon,
    .benefit-icon,
    .location-icon
) {
    transition: transform var(--transition-normal);
}

body :is(
    .products-nav-btn,
    .filter-btn,
    .pagination-btn,
    .btn-datasheet,
    .jobs-filter select
) {
    transition: transform var(--transition-fast), border-color var(--transition-normal), box-shadow var(--transition-normal), color var(--transition-normal), background var(--transition-normal);
}

body :is(
    .products-nav-btn,
    .filter-btn,
    .pagination-btn,
    .btn-datasheet,
    .jobs-filter select
):hover {
    transform: translateY(-2px);
    border-color: rgba(197, 151, 62, 0.32);
    box-shadow: 0 12px 28px rgba(199, 62, 58, 0.12);
}

body :is(.products-nav-btn, .filter-btn).active {
    box-shadow: 0 10px 24px rgba(199, 62, 58, 0.18);
}

body .location-card[data-location-filter] {
    cursor: pointer;
}

body .location-card.active-filter {
    border-color: rgba(197, 151, 62, 0.3);
    box-shadow: 0 18px 42px rgba(199, 62, 58, 0.14);
}

body .faq-item.active {
    border-color: rgba(197, 151, 62, 0.16);
}

body .faq-item.active .faq-question {
    color: var(--accent);
}

body .filter-empty-state {
    padding: 26px 28px;
    border: 1px dashed rgba(197, 151, 62, 0.26);
    border-radius: 18px;
    color: var(--gray-400);
    text-align: center;
    background: rgba(197, 151, 62, 0.04);
}

/* Footer */
.footer {
    background: var(--dark-secondary);
    border-top: 1px solid rgba(197, 151, 62, 0.15);
    padding: 60px 60px 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--gray-400);
    font-size: 14px;
    line-height: 1.8;
    margin-top: 12px;
}

.footer-col h4 {
    font-family: 'Noto Serif SC', serif;
    font-size: 14px;
    font-weight: 700;
    color: var(--gray-100);
    letter-spacing: 3px;
    margin-bottom: 20px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col ul li,
.footer-col ul li a {
    color: var(--gray-400);
    font-size: 14px;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(197, 151, 62, 0.1);
    padding-top: 24px;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright {
    color: var(--gray-500);
    font-size: 13px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--gray-500);
    font-size: 13px;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 48px;
    height: 48px;
    background: var(--dark-tertiary);
    border: 1px solid rgba(197, 151, 62, 0.3);
    border-radius: 50%;
    color: var(--accent);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary);
    color: var(--gray-100);
}

/* Responsive */
@media (max-width: 1024px) {
    .nav { padding: 16px 32px; }
    .footer { padding: 48px 32px 24px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-mobile-toggle { display: inline-flex; }
    .nav { padding: 16px 20px; gap: 16px; }
    .nav-cta { margin-left: auto; gap: 12px; }
    .nav-cta .lang-switch { display: none; }
    .nav-cta .btn { padding: 10px 18px; font-size: 13px; }
    .logo span { font-size: 18px; letter-spacing: 2px; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom-content { flex-direction: column; gap: 12px; }
    .back-to-top {
        right: 20px;
        bottom: 20px;
    }
}