/* ========================================
   晟达通节能科技 - 企业官网样式
   配色：爱马仕橙 + 香槟金 + 暖灰系
   ======================================== */

/* ===== 基础重置 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #C75A12;
    --color-primary-light: #E8833A;
    --color-primary-dark: #9A470E;
    --color-accent: #B08948;
    --color-accent-light: #C9A86A;
    --color-dark: #20242A;
    --color-gray-900: #20242A;
    --color-gray-700: #44464C;
    --color-gray-500: #8A8A92;
    --color-gray-300: #D9D4CC;
    --color-gray-100: #EFEDE9;
    --color-light: #FBFAF8;
    --color-white: #FFFFFF;
    --color-text: #26262C;
    --color-text-light: #75757F;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.10);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.20);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --header-h: 80px;
    --container-w: 1200px;
    --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
    --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-white);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* ===== 容器 ===== */
.container {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 24px;
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-h);
    z-index: 1000;
    transition: var(--transition);
    background: transparent;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    height: 70px;
    backdrop-filter: blur(10px);
}

.header-inner {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.logo-icon {
    width: 144px;
    height: 144px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-weight: 700;
    font-size: 22px;
    font-family: var(--font-serif);
    box-shadow: 0 4px 12px rgba(230, 99, 26, 0.3);
    flex-shrink: 0;
}

.logo-img {
    width: 144px;
    height: 144px;
    object-fit: contain;
    border-radius: 8px;
    flex-shrink: 0;
    transition: var(--transition);
}

.footer-brand .logo-img {
    width: 152px;
    height: 52px;
}

.logo-text {
    display: none !important;
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.logo-text .cn {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 1px;
    transition: var(--transition);
}

.logo-text .en {
    font-size: 10px;
    color: rgba(255,255,255,0.6);
    letter-spacing: 2px;
    text-transform: uppercase;
    transition: var(--transition);
}

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

.header.scrolled .logo-text .en {
    color: var(--color-text-light);
}

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

.nav-link {
    padding: 8px 20px;
    font-size: 15px;
    font-weight: 500;
    color: rgba(255,255,255,0.85);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.header.scrolled .nav-link {
    color: var(--color-gray-700);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
    font-size: 18px;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--color-accent);
    border-radius: 2px;
}

.nav-cta {
    margin-left: 16px;
    padding: 10px 24px;
    background: var(--color-accent);
    color: var(--color-white) !important;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.nav-cta:hover {
    background: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(201, 169, 97, 0.4);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.menu-toggle span {
    width: 26px;
    height: 3px;
    background: var(--color-white);
    border-radius: 3px;
    transition: var(--transition);
}

.header.scrolled .menu-toggle span {
    background: var(--color-primary);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ===== 语言切换按钮 ===== */
.lang-toggle {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    margin-left: 18px;
    padding: 6px 12px;
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    border-radius: 999px;
    background: transparent;
    color: var(--color-white);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    flex-shrink: 0;
}

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

.header.scrolled .lang-toggle {
    border-color: rgba(230, 99, 26, 0.4);
    color: var(--color-primary);
}

.lang-toggle .lang-zh,
.lang-toggle .lang-en {
    padding: 0 3px;
    opacity: 0.55;
    transition: opacity 0.2s;
}

.lang-toggle .lang-zh.active,
.lang-toggle .lang-en.active {
    opacity: 1;
    font-weight: 700;
    color: var(--color-accent);
}

.lang-toggle .lang-sep {
    opacity: 0.4;
    font-size: 11px;
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, #20242A 0%, #2A2020 50%, #3D2817 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 80% 20%, rgba(201, 169, 97, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 80%, rgba(240, 136, 62, 0.3) 0%, transparent 50%);
    z-index: 1;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.05;
    background-image:
        repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(255,255,255,0.1) 35px, rgba(255,255,255,0.1) 70px);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-inner {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 24px;
    padding-top: var(--header-h);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(201, 169, 97, 0.15);
    border: 1px solid rgba(201, 169, 97, 0.4);
    border-radius: 50px;
    color: var(--color-accent);
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 56px;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.25;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.hero-title .accent {
    color: var(--color-accent);
    position: relative;
}

.hero-subtitle {
    font-size: 19px;
    color: rgba(255,255,255,0.75);
    max-width: 600px;
    margin-bottom: 40px;
    line-height: 1.8;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: 1px;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-white);
    box-shadow: 0 6px 20px rgba(201, 169, 97, 0.35);
}

.btn-primary:hover {
    background: var(--color-accent-light);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(201, 169, 97, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255,255,255,0.3);
}

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

.btn-dark {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-dark:hover {
    background: var(--color-primary-light);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(230, 99, 26, 0.35);
}

/* Hero 统计 */
.hero-stats {
    display: flex;
    gap: 56px;
    margin-top: 72px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.12);
}

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

.stat-num {
    font-size: 42px;
    font-weight: 700;
    color: var(--color-accent);
    font-family: var(--font-serif);
    line-height: 1;
}

.stat-num .unit {
    font-size: 20px;
    margin-left: 2px;
}

.stat-label {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-top: 8px;
}

/* ===== 通用 Section ===== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-light {
    background: var(--color-light);
}

.section-dark {
    background: var(--color-dark);
    color: rgba(255,255,255,0.85);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(230, 99, 26, 0.08);
    color: var(--color-primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: 50px;
    letter-spacing: 1px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.section-dark .section-tag {
    background: rgba(201, 169, 97, 0.15);
    color: var(--color-accent);
}

.section-title {
    font-family: var(--font-serif);
    font-size: 38px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 18px;
    letter-spacing: 2px;
}

.section-dark .section-title {
    color: var(--color-white);
}

.section-desc {
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 1.8;
}

.section-dark .section-desc {
    color: rgba(255,255,255,0.65);
}

/* ===== 卡片网格 ===== */
.grid {
    display: grid;
    gap: 30px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== 特性卡片 ===== */
.feature-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 40px 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-gray-100);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(230,99,26,0.08), rgba(240,136,62,0.12));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    transition: var(--transition);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    stroke: var(--color-primary);
    fill: none;
    stroke-width: 1.8;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
}

.feature-card:hover .feature-icon svg {
    stroke: var(--color-accent);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ===== 关于我们简介 ===== */
.about-preview {
    display: block;
    position: relative;
}

.about-preview-content h2 {
    font-family: var(--font-serif);
    font-size: 36px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.about-preview-content .subtitle {
    font-size: 15px;
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 3px;
    margin-bottom: 28px;
    text-transform: uppercase;
}

.about-preview-content p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 2;
    margin-bottom: 20px;
}

.about-preview-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 32px 0;
}

.about-preview-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-gray-700);
    font-weight: 500;
}

.about-preview-list li::before {
    content: '';
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 12px;
}

.about-preview-image {
    width: 100%;
    margin: 24px 0 32px;
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 21 / 10;
    box-shadow: var(--shadow-xl);
}

.about-preview-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-preview-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(26,26,36,0.5) 100%);
}

.about-preview-badge {
    position: absolute;
    bottom: 30px;
    left: 30px;
    right: 30px;
    z-index: 2;
    color: var(--color-white);
}

.about-preview-badge .num {
    font-size: 48px;
    font-weight: 700;
    font-family: var(--font-serif);
    color: var(--color-accent);
    line-height: 1;
}

.about-preview-badge .text {
    font-size: 14px;
    color: rgba(255,255,255,0.8);
    margin-top: 8px;
}

/* ===== 产品卡片 ===== */
.product-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-gray-100);
}

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

.product-image {
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-light));
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(26,26,36,0.85) 100%);
    display: flex;
    align-items: flex-end;
    padding: 20px;
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-overlay span {
    color: var(--color-white);
    font-size: 13px;
    font-weight: 500;
}

.product-info {
    padding: 28px 24px;
}

.product-info h3 {
    font-size: 19px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 10px;
    transition: var(--transition);
}

.product-card:hover .product-info h3 {
    color: var(--color-accent);
}

.product-info p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 16px;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-tag {
    padding: 4px 12px;
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    font-size: 12px;
    border-radius: 50px;
    font-weight: 500;
}

/* ===== 资质徽章 ===== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 24px;
}

.cert-item {
    text-align: center;
    padding: 36px 20px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.cert-item:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--color-accent);
    transform: translateY(-5px);
}

.cert-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    background: rgba(201, 169, 97, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--color-accent);
    fill: none;
    stroke-width: 1.8;
}

.cert-item h4 {
    font-size: 15px;
    color: var(--color-white);
    font-weight: 600;
    margin-bottom: 6px;
}

.cert-item p {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
}

/* ===== 应用领域 ===== */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.app-item {
    text-align: center;
    padding: 36px 20px;
    border-radius: var(--radius-md);
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    transition: var(--transition);
    cursor: pointer;
}

.app-item:hover {
    background: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.app-item:hover .app-icon {
    background: rgba(201, 169, 97, 0.2);
}

.app-item:hover .app-icon svg {
    stroke: var(--color-accent);
}

.app-item:hover h4,
.app-item:hover p {
    color: var(--color-white);
}

.app-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(230,99,26,0.08), rgba(240,136,62,0.12));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.app-icon svg {
    width: 30px;
    height: 30px;
    stroke: var(--color-primary);
    fill: none;
    stroke-width: 1.8;
    transition: var(--transition);
}

.app-item h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
    transition: var(--transition);
}

.app-item p {
    font-size: 13px;
    color: var(--color-text-light);
    transition: var(--transition);
}

/* ===== CTA 区域 ===== */
.cta-section {
    position: relative;
    padding: 100px 0;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-primary-dark) 100%);
    text-align: center;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(201, 169, 97, 0.1) 0%, transparent 60%);
}

.cta-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-family: var(--font-serif);
    font-size: 38px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.cta-content p {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 40px;
    line-height: 1.8;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--color-dark);
    color: rgba(255,255,255,0.6);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.8fr 1fr 1fr 1.5fr 1.3fr;
    gap: 40px;
    margin-bottom: 64px;
}

.footer-brand .logo {
    margin-bottom: 24px;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.9;
    margin-bottom: 24px;
}

.footer-brand .slogan {
    font-family: var(--font-serif);
    font-size: 18px;
    color: var(--color-accent);
    letter-spacing: 4px;
    padding: 16px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-col h4 {
    font-size: 16px;
    color: var(--color-white);
    font-weight: 600;
    margin-bottom: 24px;
    position: relative;
    padding-bottom: 12px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 32px;
    height: 2px;
    background: var(--color-accent);
}

.footer-col ul li {
    margin-bottom: 14px;
}

.footer-col ul li a {
    font-size: 14px;
    color: rgba(255,255,255,0.55);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--color-accent);
    padding-left: 4px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 18px;
    font-size: 14px;
}

.footer-contact li svg {
    width: 20px;
    height: 20px;
    stroke: var(--color-accent);
    fill: none;
    stroke-width: 1.8;
    flex-shrink: 0;
    margin-top: 3px;
}

.footer-contact li span {
    color: rgba(255,255,255,0.55);
    line-height: 1.7;
}

/* 页脚扫码关注 */
.qr-group {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.qr-item {
    text-align: center;
}

.qr-box {
    width: 80px;
    height: 80px;
    background: var(--color-white);
    border-radius: 8px;
    padding: 5px;
    margin-bottom: 8px;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.qr-item:hover .qr-box {
    transform: translateY(-3px);
}

.qr-box img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qr-item span {
    font-size: 12px;
    color: rgba(255,255,255,0.55);
    line-height: 1.5;
}

.footer-bottom {
    padding: 28px 0;
    border-top: 1px solid rgba(255,255,255,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

.footer-bottom a {
    color: rgba(255,255,255,0.4);
    transition: var(--transition);
}

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

/* ===== 页面 Banner ===== */
.page-banner {
    position: relative;
    padding: 160px 0 80px;
    background: linear-gradient(135deg, #20242A 0%, #2A2020 60%, #3D2817 100%);
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 70% 30%, rgba(201, 169, 97, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 30% 70%, rgba(240, 136, 62, 0.2) 0%, transparent 50%);
}

.page-banner::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: var(--color-white);
    clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 60%);
}

.page-banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.page-banner h1 {
    font-family: var(--font-serif);
    font-size: 46px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 16px;
    letter-spacing: 3px;
}

.page-banner .breadcrumb {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: rgba(255,255,255,0.5);
}

.page-banner .breadcrumb a {
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

.page-banner .breadcrumb a:hover {
    color: var(--color-accent);
}

.page-banner .breadcrumb .separator {
    color: rgba(255,255,255,0.3);
}

.page-banner .breadcrumb .current {
    color: var(--color-accent);
}

/* ===== 关于我们 - 时间线 ===== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-primary));
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: 0 40px 40px 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
    padding: 0 0 40px 40px;
}

.timeline-dot {
    position: absolute;
    right: -8px;
    top: 0;
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border: 4px solid var(--color-white);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(201, 169, 97, 0.2);
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
    right: auto;
}

.timeline-content {
    background: var(--color-white);
    padding: 28px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.timeline-year {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-accent);
    font-family: var(--font-serif);
    margin-bottom: 8px;
}

.timeline-content h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ===== 企业文化 ===== */
.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.culture-card {
    text-align: center;
    padding: 48px 36px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-top: 4px solid transparent;
}

.culture-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-top-color: var(--color-accent);
}

.culture-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 28px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.culture-icon svg {
    width: 36px;
    height: 36px;
    stroke: var(--color-accent);
    fill: none;
    stroke-width: 1.8;
}

.culture-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-family: var(--font-serif);
}

.culture-card .en-title {
    font-size: 13px;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.culture-card p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.9;
}

/* ===== 数据展示 ===== */
.data-showcase {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.data-item {
    text-align: center;
    padding: 40px 20px;
    border-radius: var(--radius-md);
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    transition: var(--transition);
}

.data-item:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--color-accent);
}

.data-num {
    font-size: 52px;
    font-weight: 700;
    color: var(--color-accent);
    font-family: var(--font-serif);
    line-height: 1;
}

.data-num .unit {
    font-size: 22px;
    margin-left: 2px;
}

.data-label {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-top: 12px;
}

/* ===== 产品详情 ===== */
.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.product-detail:nth-child(even) .product-detail-image {
    order: 2;
}

.product-detail-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    aspect-ratio: 4/3;
}

.product-detail-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-detail-content h3 {
    font-family: var(--font-serif);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.product-detail-content .en-name {
    font-size: 14px;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 24px;
}

.product-detail-content p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 2;
    margin-bottom: 24px;
}

.spec-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 24px;
}

.spec-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-gray-700);
}

.spec-list li::before {
    content: '✓';
    width: 22px;
    height: 22px;
    background: var(--color-accent);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

/* ===== 联系页面 ===== */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-info-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-info-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-info-icon svg {
    width: 26px;
    height: 26px;
    stroke: var(--color-accent);
    fill: none;
    stroke-width: 1.8;
}

.contact-info-text h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 6px;
}

.contact-info-text p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.7;
}

.contact-form {
    background: var(--color-white);
    padding: 48px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.contact-form h3 {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.contact-form .form-desc {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 32px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--color-gray-100);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-light);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 4px rgba(230, 99, 26, 0.08);
}

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

.form-submit {
    width: 100%;
    padding: 16px;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
    letter-spacing: 2px;
}

.form-submit:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(230, 99, 26, 0.3);
}

/* 地图区域 */
.map-section {
    padding: 0;
    height: 450px;
    background: var(--color-gray-100);
    position: relative;
    overflow: hidden;
}

.map-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2A2020 0%, #3D2817 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.map-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 40px 40px;
}

.map-info {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--color-white);
}

.map-info .map-pin {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--color-accent);
    border-radius: 50% 50% 50% 0;
    transform: rotate(-45deg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(201, 169, 97, 0.5);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: rotate(-45deg) translateY(0); }
    50% { transform: rotate(-45deg) translateY(-10px); }
}

.map-pin svg {
    width: 30px;
    height: 30px;
    stroke: var(--color-white);
    fill: none;
    stroke-width: 2;
    transform: rotate(45deg);
}

.map-info h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.map-info p {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
}

/* ===== 动画 ===== */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.fade-up:nth-child(2) { transition-delay: 0.1s; }
.fade-up:nth-child(3) { transition-delay: 0.2s; }
.fade-up:nth-child(4) { transition-delay: 0.3s; }
.fade-up:nth-child(5) { transition-delay: 0.4s; }
.fade-up:nth-child(6) { transition-delay: 0.5s; }

/* ===== 吉祥物（默认停在右下角）===== */
.mascot-intro {
    position: fixed;
    bottom: 80px;
    right: 20px;
    z-index: 9998;
    pointer-events: auto;
    cursor: pointer;
}

.mascot-intro img {
    display: block;
    width: 144px;
    height: 202px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.3));
    opacity: 1;
    animation: mascotCornerFloat 3s ease-in-out infinite;
}

/* hover */
.mascot-intro:hover img {
    animation: mascotCornerFloat 3s ease-in-out infinite, mascotCornerBounce 0.3s ease;
}

/* 提示文字 */
.mascot-tip {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 12px;
    padding: 6px 14px;
    border-radius: 8px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}
.mascot-tip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--color-primary);
}
.mascot-intro:hover .mascot-tip { opacity: 1; }

/* ===== 首页：从天而降 → 停留 → 飞向角落（每次刷新播放）===== */
.mascot-intro.dropping {
    top: 0;
    bottom: auto;
    left: 50%;
    right: auto;
    width: 160px;
    height: 224px;
    margin-left: -80px;
    transform: translateY(-120vh);
    pointer-events: none;
    animation: mascotContainerDrop 1.2s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}

.mascot-intro.dropping img {
    width: 100%;
    height: 100%;
    animation: none;
}

/* --- 关键帧 --- */
@keyframes mascotContainerDrop {
    0%   { transform: translateY(-120vh) scale(0.3) rotate(-15deg); opacity: 0; }
    20%  { opacity: 1; }
    60%  { transform: translateY(calc(50vh - 120px)) scale(1.05) rotate(3deg); }
    72%  { transform: translateY(calc(50vh - 90px)) scale(0.95) rotate(-2deg); }
    82%  { transform: translateY(calc(50vh - 120px)) scale(1.02) rotate(1deg); }
    92%  { transform: translateY(calc(50vh - 110px)) scale(1) rotate(0deg); }
    100% { transform: translateY(calc(50vh - 120px)) scale(1) rotate(0deg); opacity: 1; }
}

@keyframes mascotCornerFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

@keyframes mascotCornerBounce {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-8px) scale(1.08); }
}

/* 移动端 */
@media (max-width: 768px) {
    .mascot-intro { right: 10px; bottom: 70px; }
    .mascot-intro.dropping { width: 120px; height: 168px; margin-left: -60px; }
    .mascot-intro img { width: 108px; height: 151px; }
}

/* ===== 响应式 ===== */

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .footer-follow {
        grid-column: span 2;
    }

    .about-preview-image {
        margin: 20px 0 28px;
    }

    .hero-title {
        font-size: 44px;
    }

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

@media (max-width: 768px) {
    :root {
        --header-h: 70px;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 30px 30px;
        gap: 0;
        transition: right 0.4s ease;
        box-shadow: -10px 0 40px rgba(0,0,0,0.15);
        overflow-y: auto;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        width: 100%;
        padding: 16px 20px;
        color: var(--color-gray-700) !important;
        border-bottom: 1px solid var(--color-gray-100);
        border-radius: 0;
    }

    .nav-link.active {
        color: var(--color-accent) !important;
    }

    .nav-cta {
        margin-left: 0;
        margin-top: 16px;
        width: 100%;
        text-align: center;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 120px 0 80px;
    }

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

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

    .hero-stats {
        flex-wrap: wrap;
        gap: 32px;
        margin-top: 48px;
    }

    .stat-num {
        font-size: 32px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .about-preview,
    .product-detail,
    .contact-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-preview-image {
        width: 100%;
        margin: 0 0 28px;
    }

    .product-detail:nth-child(even) .product-detail-image {
        order: 0;
    }

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

    .data-showcase {
        grid-template-columns: 1fr 1fr;
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .page-banner {
        padding: 120px 0 60px;
    }

    .page-banner h1 {
        font-size: 32px;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        width: 100%;
        left: 0;
        padding: 0 0 30px 50px;
    }

    .timeline-item:nth-child(even) .timeline-dot {
        left: 12px;
    }

    .timeline-dot {
        left: 12px;
        right: auto;
    }

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

    .contact-form {
        padding: 32px 24px;
    }

    .about-preview-list {
        grid-template-columns: 1fr;
    }

    .about-preview-image {
        aspect-ratio: 16 / 10;
    }

    .spec-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 26px;
    }

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

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

    .data-showcase {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 24px;
    }
}

/* ===== Banner 轮播 ===== */
.banner-slider {
    display: none;
    position: relative;
    width: 100%;
    overflow: hidden;
    background: #20242A;
}

.banner-track {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.banner-slide {
    flex: 0 0 100%;
    min-width: 100%;
}

.banner-slide img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 1920 / 900;
    max-height: 620px;
    min-height: 220px;
    object-fit: cover;
    object-position: center;
    user-select: none;
    -webkit-user-drag: none;
}

.banner-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: none;
    background: rgba(32, 36, 42, 0.35);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.3s ease;
}

.banner-arrow:hover {
    background: rgba(32, 36, 42, 0.65);
}

.banner-arrow.prev {
    left: 22px;
}

.banner-arrow.next {
    right: 22px;
}

.banner-dots {
    position: absolute;
    left: 50%;
    bottom: 18px;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 2;
}

.banner-dot {
    width: 9px;
    height: 9px;
    border-radius: 5px;
    border: none;
    padding: 0;
    background: rgba(255, 255, 255, 0.45);
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    transition: all 0.3s ease;
}

.banner-dot.active {
    width: 24px;
    background: #fff;
}

@media (max-width: 768px) {
    .banner-arrow {
        display: none;
    }

    .banner-slide img {
        min-height: 200px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .banner-track {
        transition: none;
    }
}