/* ===== CSS Variables ===== */
:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f3f8;
    --bg-card: #ffffff;
    --bg-card-hover: #f5f8fc;
    --accent-primary: #00a896;
    --accent-secondary: #2196f3;
    --accent-gradient: linear-gradient(135deg, #00c9b7, #2196f3);
    --accent-gradient-reverse: linear-gradient(135deg, #2196f3, #00c9b7);
    --text-primary: #0a2536;
    --text-secondary: #48677d;
    --text-muted: #7c97a9;
    --border-color: rgba(10, 25, 41, 0.1);
    --border-color-hover: rgba(0, 168, 150, 0.45);
    --shadow-glow: 0 0 40px rgba(0, 168, 150, 0.18);
    --shadow-card: 0 4px 30px rgba(15, 40, 66, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1280px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #001830;
    box-shadow: 0 4px 20px rgba(0, 229, 160, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 229, 160, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid rgba(10, 25, 41, 0.25);
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(0, 229, 160, 0.05);
}

.btn-sm { padding: 10px 24px; font-size: 14px; }

/* ===== Gradient Text ===== */
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 2px 20px rgba(15, 40, 66, 0.12);
}

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

.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo-img {
    height: 56px;
    width: auto;
    display: block;
}

/* Nav Menu */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: rgba(10, 25, 41, 0.06);
}

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

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switch {
    position: relative;
    cursor: pointer;
}

.lang-current {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px;
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    box-shadow: var(--shadow-card);
}

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

.lang-dropdown a {
    display: block;
    padding: 6px 12px;
    font-size: 14px;
    color: var(--text-secondary);
    border-radius: 4px;
    transition: var(--transition);
}

.lang-dropdown a:hover, .lang-dropdown a.active {
    color: var(--accent-primary);
    background: rgba(0, 229, 160, 0.08);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

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

/* ===== Hero Product Slider ===== */
.hero-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.9s ease, visibility 0.9s ease;
}

.hero-slide.active {
    opacity: 1;
    visibility: visible;
    z-index: 1;
}

.hero-slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.slide-bg-teal { background: linear-gradient(140deg, #ecf2f8 0%, #dfe8f2 45%, #f2f6fa 100%); }
.slide-bg-blue { background: linear-gradient(140deg, #e8f0fa 0%, #d5e4f3 45%, #eef4fa 100%); }
.slide-bg-amber { background: linear-gradient(140deg, #eef2f7 0%, #e0e6ee 45%, #f4f7fb 100%); }
.slide-bg-emerald { background: linear-gradient(140deg, #ecf2f8 0%, #dfe8f2 45%, #f2f6fa 100%); }

.hero-slide.active .hero-slide-bg { animation: slideBgFade 1s ease; }

@keyframes slideBgFade {
    from { opacity: 0; }
    to { opacity: 1; }
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(10, 25, 41, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(10, 25, 41, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 72%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 72%);
}

.hero-glow {
    position: absolute;
    top: 16%;
    left: 50%;
    transform: translateX(-50%);
    width: 820px;
    height: 820px;
    background: radial-gradient(circle, rgba(33, 150, 243, 0.15) 0%, transparent 60%);
    filter: blur(60px);
    transition: background 0.9s ease;
}

.hero-glow::before {
    content: '';
    position: absolute;
    top: 30%;
    left: 18%;
    width: 480px;
    height: 480px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.6) 0%, transparent 60%);
    filter: blur(40px);
}

.slide-bg-blue .hero-glow { background: radial-gradient(circle, rgba(33, 150, 243, 0.18) 0%, transparent 60%); }
.slide-bg-amber .hero-glow { background: radial-gradient(circle, rgba(33, 150, 243, 0.12) 0%, transparent 60%); }
.slide-bg-emerald .hero-glow { background: radial-gradient(circle, rgba(33, 150, 243, 0.15) 0%, transparent 60%); }

.hero-slide-inner {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    width: 100%;
    min-height: calc(100vh - 72px);
    padding: 70px 0 170px;
}

.hero-slide-text {
    max-width: 560px;
    text-align: left;
    flex-shrink: 0;
}

/* 文字入场动画：切换幻灯片时依次播放 */
.hero-slide-text > * {
    opacity: 0;
    transform: translateY(26px);
}

.hero-slide.active .hero-slide-text > * {
    animation: fadeInUp 0.7s ease forwards;
}

.hero-slide.active .hero-slide-text > *:nth-child(1) { animation-delay: 0.1s; }
.hero-slide.active .hero-slide-text > *:nth-child(2) { animation-delay: 0.25s; }
.hero-slide.active .hero-slide-text > *:nth-child(3) { animation-delay: 0.4s; }
.hero-slide.active .hero-slide-text > *:nth-child(4) { animation-delay: 0.55s; }

.hero-slide-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 0;
}

.product-stage {
    position: relative;
    width: min(520px, 100%);
    animation: productFloat 7s ease-in-out infinite;
}

@keyframes productFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-14px); }
}

.product-img {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 26px 44px rgba(0, 0, 0, 0.45));
}

/* 轮播实物图：浅阴影 + 圆角，适配浅色背景 */
.product-stage .product-photo {
    max-width: min(440px, 100%);
    max-height: 420px;
    width: auto;
    margin: 0 auto;
    border-radius: 20px;
    filter: drop-shadow(0 18px 36px rgba(15, 40, 66, 0.2));
    background: rgba(255, 255, 255, 0.6);
}

.float-chip {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(10, 25, 41, 0.12);
    border-radius: 12px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    font-size: 13px;
    color: #33485b;
    white-space: nowrap;
    box-shadow: 0 10px 28px rgba(15, 40, 66, 0.15);
}

.float-chip b {
    color: var(--accent-primary);
    font-size: 15px;
}

.chip-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--accent-gradient);
    color: #fff;
    font-size: 14px;
    flex-shrink: 0;
}

.chip-a {
    top: 4%;
    right: -3%;
    animation: chipFloat 5s ease-in-out infinite;
}

.chip-b {
    bottom: 13%;
    left: -5%;
    animation: chipFloat 6s ease-in-out 1.2s infinite;
}

@keyframes chipFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* 轮播箭头 */
.hero-arrow {
    position: absolute;
    top: 46%;
    transform: translateY(-50%);
    z-index: 3;
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(10, 25, 41, 0.15);
    border-radius: 50%;
    color: #1a3a52;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.hero-arrow svg { width: 20px; height: 20px; }

.hero-arrow:hover {
    background: var(--accent-gradient);
    border-color: transparent;
    transform: translateY(-50%) scale(1.08);
    box-shadow: 0 8px 24px rgba(0, 201, 183, 0.35);
}

.hero-arrow-prev { left: 24px; }
.hero-arrow-next { right: 24px; }

/* 轮播指示器 */
.hero-dots {
    position: absolute;
    bottom: 128px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    gap: 10px;
}

.hero-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(10, 25, 41, 0.18);
    border: none;
    padding: 0;
    cursor: pointer;
    transition: all 0.3s ease;
}

.hero-dot:hover { background: rgba(10, 25, 41, 0.35); }

.hero-dot.active {
    width: 30px;
    border-radius: 6px;
    background: var(--accent-gradient);
}

/* 数据统计栏 */
.hero-stats-wrap {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 2;
    padding: 0 20px 34px;
    pointer-events: none;
}

.hero-stats-wrap .container { pointer-events: auto; }

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 24px 32px;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(10, 25, 41, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    max-width: 900px;
    margin: 0 auto;
    box-shadow: 0 16px 40px rgba(15, 40, 66, 0.14);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(0, 201, 183, 0.08);
    border: 1px solid rgba(0, 201, 183, 0.22);
    border-radius: 50px;
    font-size: 14px;
    color: var(--accent-primary);
    margin-bottom: 28px;
}

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

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

.hero-title {
    font-size: clamp(34px, 5.4vw, 60px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 22px;
}

.hero-subtitle {
    font-size: clamp(14px, 1.8vw, 17px);
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 0 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: flex-start;
}

.hero-stat {
    flex: 1;
    text-align: center;
}

.hero-stat-num {
    font-size: 36px;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-stat-unit {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent-primary);
}

.hero-stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.hero-stat-divider {
    width: 1px;
    height: 50px;
    background: var(--border-color);
    margin: 0 16px;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header-light .section-title,
.section-header-light .section-desc {
    color: var(--text-primary);
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--accent-primary);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Intro Section ===== */
.intro-section {
    background: var(--bg-secondary);
    padding: 50px 0;
}

.intro-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.intro-text {
    font-size: 18px;
    font-weight: 500;
    color: #3d5165;
    line-height: 1.9;
    letter-spacing: 0.5px;
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.product-card:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-6px);
    box-shadow: var(--shadow-card), var(--shadow-glow);
}

.product-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, color-mix(in srgb, var(--prod-color) 8%, var(--bg-secondary)), var(--bg-secondary));
    position: relative;
    overflow: hidden;
}

.product-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, color-mix(in srgb, var(--prod-color) 10%, transparent) 0%, transparent 70%);
}

.product-image::after {
    content: '';
    position: absolute;
    width: 130px;
    height: 130px;
    border-radius: 50%;
    background: rgba(10, 25, 41, 0.05);
    z-index: 0;
    transition: var(--transition);
}

.product-image img {
    width: auto;
    height: 140px;
    max-width: 90%;
    object-fit: contain;
    position: relative;
    z-index: 1;
    transition: var(--transition);
    filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.4));
}

/* 产品中心卡片实物图：浅色背景上使用柔和投影 */
.category-card .product-image img {
    height: 150px;
    max-width: 88%;
    filter: drop-shadow(0 10px 22px rgba(15, 40, 66, 0.16));
}

.product-image svg {
    width: 100px;
    height: 100px;
    color: var(--prod-color);
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.product-card:hover .product-image::after {
    background: rgba(10, 25, 41, 0.09);
}

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

.product-body {
    padding: 28px;
}

.product-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-primary);
    padding: 4px 12px;
    background: rgba(0, 229, 160, 0.08);
    border-radius: 50px;
    margin-bottom: 12px;
}

.product-body h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
}

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

.product-specs {
    margin-bottom: 16px;
}

.product-specs li {
    font-size: 13px;
    color: var(--text-muted);
    padding: 4px 0;
    padding-left: 18px;
    position: relative;
}

.product-specs li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

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

.product-link:hover {
    letter-spacing: 1px;
}

/* ===== Solutions Section ===== */
.solutions-section {
    background: var(--bg-tertiary);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.solution-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.solution-card:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-6px);
}

.solution-featured {
    border-color: rgba(0, 229, 160, 0.3);
    box-shadow: var(--shadow-glow);
}

.solution-header {
    padding: 36px 28px;
    background: var(--sol-grad);
    position: relative;
}

.solution-header svg {
    width: 56px;
    height: 56px;
    margin-bottom: 16px;
}

.solution-header h3 {
    font-size: 24px;
    font-weight: 700;
    color: white;
}

.solution-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    color: white;
    backdrop-filter: blur(10px);
}

.solution-body {
    padding: 28px;
}

.solution-body > p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.solution-features {
    margin-bottom: 20px;
}

.solution-features li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
}

.solution-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 700;
}

.solution-tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.solution-chip {
    font-size: 12px;
    color: var(--text-secondary);
    padding: 4px 12px;
    background: rgba(10, 25, 41, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 50px;
}

/* ===== Stats Section ===== */
.stats-section {
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.stats-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(0, 229, 160, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(33, 150, 243, 0.08) 0%, transparent 50%);
}

.stats-section .container {
    position: relative;
    z-index: 1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-bottom: 60px;
}

.stat-item {
    text-align: center;
    padding: 36px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.stat-item:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-4px);
    background: var(--bg-card-hover);
}

.stat-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 229, 160, 0.08);
    color: var(--accent-primary);
}

.stat-icon svg {
    width: 28px;
    height: 28px;
}

.stat-number {
    font-size: 44px;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.stat-unit {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* Eco Impact */
.eco-impact {
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.eco-title {
    text-align: center;
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 32px;
    color: var(--text-primary);
}

.eco-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.eco-item {
    text-align: center;
    padding: 20px;
    border-right: 1px solid var(--border-color);
}

.eco-item:last-child { border-right: none; }

.eco-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent-primary);
    line-height: 1;
}

.eco-unit {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.eco-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ===== Projects Section ===== */
.projects-section {
    background: var(--bg-tertiary);
}

.project-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-color-hover);
}

.filter-btn.active {
    background: var(--accent-gradient);
    color: #001830;
    border-color: transparent;
    font-weight: 600;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.project-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.project-card:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-6px);
    box-shadow: var(--shadow-card);
}

.project-card.hidden {
    display: none;
}

.project-image {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.project-image svg {
    width: 100%;
    height: 100%;
    transition: var(--transition);
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.project-card:hover .project-image svg {
    transform: scale(1.05);
}

.project-info {
    padding: 24px;
}

.project-country {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
}

.project-info h3 {
    font-size: 18px;
    font-weight: 700;
    margin: 8px 0 10px;
    line-height: 1.4;
}

.project-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.project-info > p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.project-more {
    display: inline-block;
    margin-top: 14px;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
    transition: var(--transition);
}

.project-card:hover .project-more {
    color: var(--accent-secondary);
}

/* ===== News Section ===== */
.news-section {
    background: var(--bg-primary);
}

.news-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 24px;
}

.news-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.news-card:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-4px);
}

.news-featured {
    grid-row: span 2;
}

.news-featured .news-image {
    height: 280px;
    overflow: hidden;
}

.news-featured .news-image svg {
    width: 100%;
    height: 100%;
}

.news-featured h3 {
    font-size: 22px !important;
}

.news-image {
    position: relative;
}

.news-body {
    padding: 24px;
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.news-date {
    font-size: 13px;
    color: var(--text-muted);
}

.news-category {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-primary);
    padding: 2px 10px;
    background: rgba(0, 229, 160, 0.08);
    border-radius: 50px;
}

.news-body h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-body > p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.news-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
    transition: var(--transition);
}

.news-link:hover {
    letter-spacing: 1px;
}

/* ===== News columns（新闻两栏：公司新闻 / 行业洞察） ===== */
.news-columns {
    margin-top: 36px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
}

.news-col {
    min-width: 0;
    background: #ffffff;
    border: 1px solid rgba(14, 165, 233, 0.12);
    border-radius: 18px;
    padding: 24px 28px;
    box-shadow: var(--shadow-soft, 0 12px 34px rgba(15, 40, 66, 0.08));
}

.news-col-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 14px;
    margin-bottom: 6px;
    border-bottom: 1px solid rgba(14, 165, 233, 0.15);
}

.news-col-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-primary);
    flex-shrink: 0;
}

.news-col-dot.dot-insight {
    background: #1d6f42;
}

.news-col-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.news-col-sub {
    font-size: 13px;
    color: #7c93a5;
    margin-left: auto;
}

.news-row {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px dashed rgba(15, 40, 66, 0.08);
    text-decoration: none;
    transition: var(--transition);
}

.news-empty {
    padding: 40px 0 20px;
    text-align: center;
    font-size: 15px;
    color: #8ba0b2;
    letter-spacing: 1px;
}

.news-row:last-child {
    border-bottom: none;
}

.news-row:hover {
    background: rgba(14, 165, 233, 0.05);
    border-radius: 8px;
}

.news-row:hover .news-row-title {
    color: var(--accent-primary);
}

.news-row-date {
    flex-shrink: 0;
    font-size: 13px;
    font-weight: 600;
    color: #7c93a5;
    font-variant-numeric: tabular-nums;
}

.news-row-tag {
    flex-shrink: 0;
    font-size: 12px;
    font-weight: 700;
    line-height: 1;
    padding: 4px 10px;
    border-radius: 50px;
}

.tag-accident {
    color: #d4452c;
    background: rgba(212, 69, 44, 0.1);
}

.tag-policy {
    color: #0e7490;
    background: rgba(14, 116, 144, 0.1);
}

.tag-standard {
    color: #1d6f42;
    background: rgba(29, 111, 66, 0.1);
}

.news-row-title {
    flex: 1;
    min-width: 0;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.65;
    white-space: nowrap;
    overflow: hidden;
    transition: var(--transition);
}

.news-row-text {
    display: inline-block;
    white-space: nowrap;
}

@media (max-width: 900px) {
    .news-columns {
        grid-template-columns: 1fr;
    }
}

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

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    padding: 48px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 0;
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 229, 160, 0.08);
    color: var(--accent-primary);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-text h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-text p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-social {
    margin-top: 32px;
    padding-top: 28px;
    border-top: 1px solid var(--border-color);
}

.contact-social h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-link:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    background: rgba(0, 229, 160, 0.05);
    transform: translateY(-2px);
}

.social-link svg {
    width: 22px;
    height: 22px;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.2fr;
    gap: 40px;
    margin-bottom: 48px;
}

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

.footer-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-cert {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.cert-badge {
    padding: 4px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

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

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.footer-contact li {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    font-size: 13px;
    color: var(--text-muted);
    transition: var(--transition);
}

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

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: #001830;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 20px rgba(0, 229, 160, 0.3);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 30px rgba(0, 229, 160, 0.5);
}

.back-to-top svg {
    width: 22px;
    height: 22px;
}

/* ===== Scroll Reveal Animation ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .nav-link {
        padding: 8px 12px;
        font-size: 15px;
    }

    /* 释放右侧空间，保证导航完整显示 */
    .lang-switch {
        display: none;
    }

    .header-actions .btn {
        display: none;
    }
}

@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        padding: 20px;
        gap: 0;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-200%);
        transition: var(--transition);
        max-height: calc(100vh - 72px);
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-link {
        width: 100%;
        padding: 14px 16px;
        border-radius: 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-link.active::after { display: none; }

    .menu-toggle { display: flex; }

    .lang-switch { display: none; }

    .header-actions .btn { display: none; }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

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

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

    .eco-item:nth-child(2) { border-right: none; }

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

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

    .news-featured {
        grid-row: span 1;
        grid-column: span 2;
    }

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

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

    .footer-brand {
        grid-column: span 3;
    }
}

@media (max-width: 768px) {
    .section { padding: 60px 0; }

    .container { padding: 0 16px; }

    .hero-slide-inner {
        flex-direction: column;
        justify-content: center;
        gap: 24px;
        padding: 60px 0 210px;
    }

    .hero-slide-text {
        max-width: 100%;
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

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

    .hero-subtitle { font-size: 14px; }

    .hero-actions {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
    }

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

    .hero-slide-visual { flex: none; width: 100%; }

    .product-stage { width: min(340px, 92%); }

    .float-chip { font-size: 12px; padding: 8px 12px; }

    .chip-icon { width: 24px; height: 24px; font-size: 12px; }

    .hero-arrow {
        width: 38px;
        height: 38px;
        top: 38%;
    }

    .hero-arrow svg { width: 16px; height: 16px; }

    .hero-arrow-prev { left: 8px; }
    .hero-arrow-next { right: 8px; }

    .hero-dots { bottom: 140px; }

    .hero-stats {
        gap: 6px;
        padding: 16px 10px;
    }

    .hero-stat-divider { display: none; }

    .hero-stat-num { font-size: 24px; }

    .hero-stat-unit { font-size: 13px; }

    .hero-stat-label { font-size: 11px; }

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

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

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

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

    .eco-item { border-right: none; border-bottom: 1px solid var(--border-color); padding-bottom: 16px; }

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

    .project-filters {
        gap: 8px;
    }

    .filter-btn { padding: 6px 16px; font-size: 13px; }

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

    .news-featured {
        grid-column: span 1;
    }

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

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

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

    .contact-info {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .eco-impact { padding: 24px; }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-brand {
        grid-column: span 1;
    }

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