/* ========== Reset & Base ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --color-primary: #0047ba;
    --color-primary-dark: #00308a;
    --color-accent: #00B4D8;
    --color-dark: #0F172A;
    --color-bg: #F8FAFC;
    --color-white: #FFFFFF;
    --color-text: #323e48;
    --color-text-secondary: #64748B;
    --color-border: #E2E8F0;
    --color-danger: #EF4444;
    --color-success: #22C55E;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --font-sans: "Inter", "Noto Sans SC", "Segoe UI", Roboto, system-ui, -apple-system, sans-serif;
}
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); font-size: 16px; line-height: 1.6; color: var(--color-text); background: var(--color-bg); -webkit-font-smoothing: antialiased; padding-top: 72px; }
.admin-bar body { padding-top: 104px; } /* 72 navbar + 32 admin bar */
a { text-decoration: none; color: var(--color-primary); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-lg); }

/* ========== Logo ========== */
.logo-fo { color: var(--color-primary); font-weight: 700; }
.logo-silicon { color: var(--color-accent); font-weight: 700; }
.logo-on-dark .logo-fo { color: var(--color-white); }

/* ========== 导航栏 ========== */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: var(--color-white); border-bottom: 1px solid var(--color-border); height: 72px; display: flex; align-items: center; transition: all 0.3s; }
.admin-bar .navbar { top: 32px; }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-lg); width: 100%; display: flex; align-items: center; justify-content: space-between; }
.navbar .logo { display: flex; align-items: center; flex-shrink: 0; letter-spacing: -0.5px; }
.nav-menu { display: flex; gap: var(--space-lg); align-items: center; }
.nav-link { font-size: 15px; font-weight: 500; color: var(--color-text); padding: var(--space-sm) 0; position: relative; transition: color 0.2s; }
.nav-link:hover, .nav-link.active { color: var(--color-primary); }
.nav-dropdown { position: relative; }
.nav-dropdown > .nav-link::after { content: ''; font-size: 10px; margin-left: 2px; }
.nav-link.active::after {
	content: '';
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	height: 2px;
	background: var(--color-primary);
	border-radius: 1px;
}
.dropdown-menu { position: absolute; top: 100%; left: 0; background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); padding: var(--space-sm) 0; min-width: 260px; opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all 0.2s; z-index: 1001; list-style: none; margin: 0; }
.nav-dropdown:hover > .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu > li > a { display: block; padding: var(--space-sm) var(--space-md); font-size: 14px; color: var(--color-text); transition: background 0.15s; }
.dropdown-menu > li > a:hover { background: #EBF4FF; color: var(--color-primary); }
/* 二级：产品分类标题（不可点击） */
.menu-item-group { list-style: none; margin: 0; padding: 0; }
.menu-item-group > .dropdown-group {
	display: block;
	padding: 6px 16px 4px;
	font-size: 11px;
	font-weight: 600;
	color: var(--color-text-secondary);
	text-transform: uppercase;
	letter-spacing: 0.5px;
	cursor: default;
	user-select: none;
	pointer-events: none;
}
/* 三级：产品链接（嵌套展平） */
.dropdown-menu .dropdown-submenu {
	position: static;
	display: block;
	opacity: 1;
	visibility: visible;
	transform: none;
	box-shadow: none;
	border: none;
	border-radius: 0;
	padding: 0;
	margin: 0 0 4px;
	min-width: 0;
	background: transparent;
	list-style: none;
}
.dropdown-menu .dropdown-submenu > li > a {
	display: block;
	padding: var(--space-sm) var(--space-md);
	font-size: 14px;
	font-weight: 500;
	color: var(--color-text);
	transition: background 0.15s;
}
.dropdown-menu .dropdown-submenu > li > a:hover {
	background: #EBF4FF;
	color: var(--color-primary);
}

/* ========== 语言切换 ========== */
.lang-switcher { position: relative; }
.lang-btn { background: none; border: 1px solid var(--color-border); border-radius: var(--radius-sm); padding: 6px 12px; font-size: 14px; font-weight: 500; color: var(--color-text); cursor: pointer; transition: all 0.2s; font-family: var(--font-sans); }
.lang-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.lang-dropdown { position: absolute; top: 100%; right: 0; margin-top: var(--space-xs); background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); min-width: 200px; opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all 0.2s; z-index: 1001; overflow: hidden; }
.lang-switcher:hover .lang-dropdown, .lang-switcher.open .lang-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-dropdown-list { list-style: none; margin: 0; padding: var(--space-sm) 0 0; max-height: 320px; overflow-y: auto; scroll-padding-bottom: 8px; }
.lang-dropdown li { padding: 0; font-size: 14px; color: var(--color-text); cursor: pointer; transition: background 0.15s; }
.lang-dropdown li a { display: block; padding: var(--space-sm) var(--space-md); color: inherit; text-decoration: none; }
.lang-dropdown li:hover,
.lang-dropdown li.active a { background: #EBF4FF; color: var(--color-primary); }
.lang-dropdown-footer { border-top: 1px solid var(--color-border); padding: var(--space-sm) var(--space-md); background: #F8FAFC; }
.lang-edit-toggle { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--color-text); cursor: pointer; user-select: none; margin: 0; }
.lang-edit-toggle input { margin: 0; cursor: pointer; }
.mobile-lang-edit { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: 14px; cursor: pointer; }
.mobile-lang-edit input { margin: 0; }

/* ========== 汉堡菜单 ========== */
.hamburger { display: none; background: none; border: none; font-size: 28px; cursor: pointer; color: var(--color-text); padding: var(--space-sm); }
.mobile-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0; background: var(--color-white); z-index: 999; padding: var(--space-xl) var(--space-lg); overflow-y: auto; }
.admin-bar .mobile-menu { top: 104px; }
.mobile-menu.open { display: block; }
.mobile-menu ul li a { display: block; padding: var(--space-md) 0; font-size: 18px; color: var(--color-text); border-bottom: 1px solid var(--color-border); }
.mobile-lang { margin-top: var(--space-xl); }
.mobile-lang select { width: 100%; padding: 10px; font-size: 16px; border: 1px solid var(--color-border); border-radius: var(--radius-md); font-family: var(--font-sans); }

/* ========== Hero 轮播 ========== */
.hero { position: relative; overflow: hidden; }
.hero-slides { display: grid; }
.hero-slide { grid-area: 1 / 1; display: block; opacity: 0; transition: opacity 0.6s ease-in-out; padding: 0; background-color: var(--color-primary); background-image: var(--hero-bg, linear-gradient(135deg, var(--color-primary) 0%, var(--color-dark) 60%, var(--color-primary-dark) 100%)); background-size: cover; background-position: center; background-repeat: no-repeat; }
.hero-slide:not(.hero-slide--image) { min-height: 600px; display: flex; align-items: center; justify-content: flex-start; padding: 0 var(--space-lg); }
.hero-slide.active { opacity: 1; }
.hero-slide-link { display: block; line-height: 0; }
.hero-slide-img { display: block; width: 100%; height: auto; }
.hero-content { max-width: 600px; width: 100%; margin: 0 auto 0 max(0px, calc((100% - var(--container-max, 1200px)) / 2)); color: var(--color-white); z-index: 2; text-shadow: 0 1px 12px rgba(0,0,0,0.35); }
.hero-badge { display: inline-block; background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.3); border-radius: 20px; padding: 4px 16px; font-size: 13px; font-weight: 500; margin-bottom: var(--space-md); }
.hero-slide h1 { font-size: 48px; font-weight: 700; line-height: 1.2; margin-bottom: var(--space-md); }
.hero-highlight { color: var(--color-accent); }
.hero-slide p { font-size: 17px; line-height: 1.7; margin-bottom: var(--space-lg); opacity: 0.9; }
.hero-actions { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.hero-visual { position: absolute; right: 8%; top: 50%; transform: translateY(-50%); z-index: 1; opacity: 0.3; }
.chip-glow, .bio-glow, .chain-glow { width: 280px; height: 280px; border-radius: 50%; background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%); animation: pulse 3s ease-in-out infinite; }
.bio-glow { background: radial-gradient(circle, #6366F1 0%, transparent 70%); }
.chain-glow { background: radial-gradient(circle, #22D3EE 0%, transparent 70%); }
.chip-label, .bio-label, .chain-label { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); font-size: 24px; font-weight: 700; color: rgba(255,255,255,0.6); letter-spacing: 2px; }
@keyframes pulse { 0%,100% { transform: scale(1); opacity: 0.5; } 50% { transform: scale(1.1); opacity: 0.8; } }
.hero-dots { position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 3; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.4); cursor: pointer; transition: all 0.3s; }
.dot.active { background: var(--color-white); transform: scale(1.3); }
.hero-arrow { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.3); color: var(--color-white); font-size: 20px; width: 44px; height: 44px; border-radius: 50%; cursor: pointer; z-index: 3; transition: all 0.2s; display: flex; align-items: center; justify-content: center; }
.hero-arrow:hover { background: rgba(255,255,255,0.3); }
.hero-prev { left: 16px; }
.hero-next { right: 16px; }

/* ========== 通用 Section ========== */
.section { padding: var(--space-3xl) 0; }
.section-title { font-size: 36px; font-weight: 700; color: var(--color-text); margin-bottom: var(--space-sm); text-align: center; }
.section-subtitle { font-size: 17px; color: var(--color-text-secondary); text-align: center; margin-bottom: var(--space-2xl); }

/* ========== 产品分类卡片 ========== */
.product-categories { background: var(--color-white); }
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
.product-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-2xl); text-align: center; transition: all 0.3s; text-decoration: none; color: inherit; display: block; }
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--color-primary); }
.product-card-icon { width: 80px; height: 80px; margin: 0 auto var(--space-lg); background: rgba(0,71,186,0.05); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.product-card h3 { font-size: 22px; font-weight: 600; margin-bottom: var(--space-sm); color: var(--color-primary); }
.product-card p { font-size: 15px; color: var(--color-text-secondary); line-height: 1.6; }
.card-link { display: inline-block; margin-top: var(--space-md); font-size: 14px; font-weight: 600; color: var(--color-accent); }

/* ========== 解决方案（首页卡片，详情样式见 solution.css） ========== */
.solutions-section { background: var(--color-bg); }
.solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.solution-card { background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-xl); text-decoration: none; color: inherit; transition: all 0.3s; display: block; }
.solution-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--color-accent); }
.solution-icon { width: 48px; height: 48px; border-radius: 50%; background: var(--color-primary); color: var(--color-white); display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: var(--space-md); }
.solution-card h3 { font-size: 17px; font-weight: 600; margin-bottom: var(--space-sm); color: var(--color-text); }
.solutions-empty-hint {
	text-align: center;
	color: #64748B;
	grid-column: 1 / -1;
}

.product-card-emoji {
	font-size: 32px;
	line-height: 48px;
}

.product-card-img,
.solution-icon-img,
.adv-icon-img,
.support-hw-icon-img,
.custom-meta-icon {
	max-width: 48px;
	max-height: 48px;
	width: auto;
	height: auto;
	object-fit: contain;
	display: block;
}

.solution-icon.has-img,
.adv-icon.has-img,
.support-hw-icon.has-img {
	background: transparent !important;
	overflow: hidden;
}

.adv-icon.has-img {
	padding: 0;
}

.hero-visual-img {
	max-width: 280px;
	width: 100%;
	height: auto;
	object-fit: contain;
	filter: drop-shadow(0 12px 28px rgba(0, 0, 0, 0.35));
}

.site-logo-img {
	max-height: 28px;
	width: auto;
	height: auto;
	display: block;
	object-fit: contain;
}

.navbar .site-logo-img {
	max-height: 28px;
	max-width: 160px;
}

.site-logo-img--footer {
	max-height: 28px;
	max-width: 150px;
	/* 深色页脚上保持可读 */
	filter: brightness(0) invert(1);
}

/* ========== 核心优势 ========== */
.advantages-section { background: var(--color-white); }
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.advantage-card { text-align: center; padding: var(--space-xl) var(--space-md); }
.adv-icon { width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 24px; margin: 0 auto var(--space-md); }
.advantage-card h3 { font-size: 18px; font-weight: 600; margin-bottom: var(--space-sm); }
.advantage-card p { font-size: 14px; color: var(--color-text-secondary); }

/* ========== CTA ========== */
.cta-section { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%); padding: var(--space-3xl) 0; text-align: center; color: var(--color-white); }
.cta-section h2 { font-size: 32px; font-weight: 700; margin-bottom: var(--space-md); }
.cta-section p { font-size: 17px; opacity: 0.9; margin-bottom: var(--space-xl); }

/* ========== 按钮 ========== */
.btn-primary { display: inline-block; background: var(--color-primary); color: var(--color-white); padding: 12px 28px; border-radius: var(--radius-md); font-size: 15px; font-weight: 500; border: none; cursor: pointer; transition: all 0.2s; font-family: var(--font-sans); text-decoration: none; }
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { display: inline-block; background: transparent; color: var(--color-primary); padding: 12px 28px; border-radius: var(--radius-md); font-size: 15px; font-weight: 500; border: 1px solid var(--color-primary); cursor: pointer; transition: all 0.2s; font-family: var(--font-sans); text-decoration: none; }
.btn-outline:hover { background: var(--color-primary); color: var(--color-white); }
.btn-cta { display: inline-block; background: var(--color-accent); color: var(--color-white); padding: 14px 36px; border-radius: var(--radius-md); font-size: 16px; font-weight: 600; border: none; cursor: pointer; transition: all 0.2s; font-family: var(--font-sans); text-decoration: none; }
.btn-cta:hover { background: #0098b8; transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-cta.btn-large { padding: 16px 48px; font-size: 18px; }
.btn-secondary { display: inline-block; background: rgba(255,255,255,0.15); color: var(--color-white); padding: 12px 28px; border-radius: var(--radius-md); font-size: 15px; font-weight: 500; border: 1px solid rgba(255,255,255,0.4); cursor: pointer; transition: all 0.2s; font-family: var(--font-sans); text-decoration: none; }
.btn-secondary:hover { background: rgba(255,255,255,0.25); }
.btn-text { display: inline-block; background: none; color: var(--color-primary); padding: 8px 16px; font-size: 15px; font-weight: 500; border: none; cursor: pointer; transition: all 0.2s; font-family: var(--font-sans); text-decoration: underline; }

/* ========== 页脚 ========== */
.footer { background: var(--color-dark); color: rgba(255,255,255,0.7); padding: var(--space-3xl) 0 var(--space-xl); }
.footer-grid { display: grid; grid-template-columns: 1.15fr 0.8fr 1.25fr; gap: 56px; margin-bottom: var(--space-2xl); }
.footer-logo { font-size: 26px; margin-bottom: var(--space-md); }
.footer-desc { font-size: 14px; line-height: 1.6; white-space: pre-line; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: var(--color-white); margin-bottom: var(--space-md); }
.footer-col--contact h4, .footer-col--nav h4 { margin-bottom: 22px; }
.footer-col ul li { margin-bottom: var(--space-sm); }
.footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 14px; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--color-accent); }
.footer-col ul li { font-size: 14px; color: rgba(255,255,255,0.6); }
.footer-nav-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; list-style: none; margin: 0; padding: 0; }
.footer-nav-list > li { margin: 0; list-style: none; }
.footer-nav-list a,
.footer-nav-list .menu-item a { font-size: 14px; color: rgba(255,255,255,0.62); transition: color 0.2s; text-decoration: none; }
.footer-nav-list a:hover,
.footer-nav-list .menu-item a:hover { color: var(--color-accent); }
.footer-contact-list { display: grid; gap: 20px; list-style: none; margin: 0; padding: 0; }
.footer-contact-list li { margin-bottom: 0; }
.footer-contact-item { display: flex; align-items: flex-start; gap: 14px; }
.fc-icon { flex: 0 0 36px; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.10); display: flex; align-items: center; justify-content: center; color: var(--color-accent); }
.fc-icon svg { width: 17px; height: 17px; }
.fc-body { min-width: 0; }
.fc-label { display: block; font-size: 12px; letter-spacing: 1px; color: rgba(255,255,255,0.42); margin-bottom: 4px; }
.fc-value { display: block; font-size: 14px; line-height: 1.75; color: rgba(255,255,255,0.82); text-decoration: none; }
a.fc-value { transition: color 0.2s; }
a.fc-value:hover { color: var(--color-accent); }
.fc-value--tel { font-size: 18px; font-weight: 600; letter-spacing: 0.5px; color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--space-lg); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-md); font-size: 13px; }
.footer-bottom-left { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-md); }
.footer-bottom-links { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-md); }
.footer-bottom a,
.footer-beian { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover,
a.footer-beian:hover { color: var(--color-accent); }

/* ========== 页面通用 ========== */
.page-header { padding: var(--space-3xl) 0 var(--space-2xl); color: var(--color-white); text-align: center; background-color: var(--color-primary); background-image: var(--page-header-bg, linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%)); background-size: cover; background-position: center; background-repeat: no-repeat; }
.page-header h1 { font-size: 40px; font-weight: 700; margin-bottom: var(--space-md); }
.page-header p { font-size: 17px; opacity: 0.9; max-width: 700px; margin: 0 auto; }

/* ========== 面包屑 ========== */
.breadcrumb { padding: var(--space-md) 0; font-size: 14px; color: var(--color-text-secondary); }
.breadcrumb a { color: var(--color-primary); }
.breadcrumb span { margin: 0 8px; }

/* ========== 表单 ========== */
.contact-form-section { background: var(--color-bg); padding: var(--space-3xl) 0; }
.form-container { max-width: 600px; margin: 0 auto; background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-2xl); box-shadow: var(--shadow-sm); }
.form-container h2 { font-size: 24px; font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-xl); text-align: center; }
.form-group { margin-bottom: var(--space-lg); }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: var(--color-text); margin-bottom: var(--space-sm); }
.form-group label .required { color: var(--color-danger); }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px 16px; font-size: 15px; border: 1px solid #CBD5E1; border-radius: var(--radius-md); transition: all 0.2s; font-family: var(--font-sans); color: var(--color-text); background: var(--color-white); }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(0,71,186,0.1); }
.form-group textarea { min-height: 120px; resize: vertical; }
.form-group .error-msg { display: none; font-size: 13px; color: var(--color-danger); margin-top: var(--space-xs); }
.form-group.error input, .form-group.error textarea { border-color: var(--color-danger); }
.form-group.error .error-msg { display: block; }
.form-submit { width: 100%; padding: 14px; font-size: 16px; font-weight: 600; }

/* ========== Toast ========== */
.toast { position: fixed; top: 90px; right: 24px; background: var(--color-success); color: var(--color-white); padding: 14px 24px; border-radius: var(--radius-md); box-shadow: var(--shadow-lg); font-size: 15px; font-weight: 500; opacity: 0; transform: translateX(100px); transition: all 0.3s; z-index: 2000; }
.toast.show { opacity: 1; transform: translateX(0); }
.toast.error { background: var(--color-danger); }

/* ========== 关于我们 ========== */
.about-hero { padding: 56px 0 56px; background: linear-gradient(135deg, #0047ba 0%, #00308a 55%, #002470 100%); }
.about-hero__inner { max-width: 1080px; margin: 0 auto; }
.about-hero__title { font-size: 26px; font-weight: 700; color: #fff; text-align: center; margin-bottom: 8px; }
.about-hero__sub { font-size: 15px; color: rgba(255,255,255,0.75); text-align: center; margin-bottom: 36px; }
.timeline-track { position: relative; padding: 0 8px; }
.timeline-grid { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.timeline-item { position: relative; display: flex; flex-direction: column; align-items: center; }
.timeline-year { font-size: 22px; line-height: 22px; font-weight: 700; color: #fff; margin-bottom: 14px; letter-spacing: 0.5px; }
.timeline-node { width: 34px; height: 34px; border-radius: 50%; position: relative; z-index: 2; border: 4px solid #fff; box-shadow: 0 0 0 1.5px currentColor; margin-bottom: 14px; }
.timeline-item:nth-child(1) .timeline-node { background: #93C5FD; color: #93C5FD; }
.timeline-item:nth-child(2) .timeline-node { background: #60A5FA; color: #60A5FA; }
.timeline-item:nth-child(3) .timeline-node { background: #3B82F6; color: #3B82F6; }
.timeline-item:nth-child(4) .timeline-node { background: #2563EB; color: #2563EB; }
.timeline-seg { position: absolute; top: 51.5px; height: 3px; z-index: 1; }
.timeline-seg--1 { left: 12.5%; right: 62.5%; background: linear-gradient(90deg, #93C5FD, #60A5FA); }
.timeline-seg--2 { left: 37.5%; right: 37.5%; background: linear-gradient(90deg, #60A5FA, #3B82F6); }
.timeline-seg--3 { left: 62.5%; right: 12.5%; background: linear-gradient(90deg, #3B82F6, #2563EB); }
.timeline-card { width: 100%; border-radius: 14px; padding: 20px 16px; text-align: center; background: rgba(255,255,255,0.12); border: 1.5px solid rgba(255,255,255,0.28); }
.timeline-item:nth-child(1) .timeline-card { background: rgba(147,197,253,0.18); border-color: rgba(147,197,253,0.55); }
.timeline-item:nth-child(2) .timeline-card { background: rgba(96,165,250,0.18); border-color: rgba(96,165,250,0.55); }
.timeline-item:nth-child(3) .timeline-card { background: rgba(59,130,246,0.18); border-color: rgba(59,130,246,0.55); }
.timeline-item:nth-child(4) .timeline-card { background: rgba(37,99,235,0.20); border-color: rgba(37,99,235,0.60); }
.timeline-chip { font-size: 19px; font-weight: 700; color: #fff; letter-spacing: 0.5px; }
.timeline-chip-rule { width: 46px; height: 1px; background: rgba(255,255,255,0.35); margin: 12px auto; }
.timeline-role { font-size: 13px; color: rgba(255,255,255,0.88); line-height: 1.5; }

.about-content { padding: var(--space-3xl) 0; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); margin-bottom: var(--space-3xl); }
.about-text h2 { font-size: 28px; font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-lg); }
.about-text p,
.about-intro-body p { font-size: 15px; line-height: 1.8; color: var(--color-text); margin-bottom: var(--space-md); }
.about-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: var(--space-md); margin-top: var(--space-xl); }
.stat-card { text-align: center; padding: var(--space-lg); background: var(--color-bg); border-radius: var(--radius-md); border: 1px solid var(--color-border); }
.stat-num { font-size: 32px; font-weight: 700; color: var(--color-primary); line-height: 1.2; }
.stat-label { font-size: 13px; color: var(--color-text-secondary); margin-top: 4px; }
.about-areas-title { font-size: 24px; font-weight: 700; color: var(--color-primary); margin-bottom: 24px; }
.about-areas-list { display: flex; flex-direction: column; gap: 16px; }
.about-area-card { background: #F8FAFC; border: 1px solid #E2E8F0; border-radius: 12px; padding: 24px; display: flex; gap: 16px; align-items: flex-start; }
.about-area-card--banner { padding: 0; overflow: hidden; display: block; }
.about-area-banner-img { display: block; width: 100%; height: auto; }
.about-area-icon { width: 48px; height: 48px; border-radius: 50%; background: var(--color-primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; overflow: hidden; }
.about-area-icon.has-img { background: transparent; }
.about-area-icon-img { max-width: 48px; max-height: 48px; object-fit: contain; }
.about-area-card h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; color: var(--color-text); }
.about-area-card p { font-size: 14px; color: #64748B; margin: 0; }
.about-contact-title { font-size: 28px; font-weight: 700; color: var(--color-primary); margin-bottom: 24px; text-align: center; }
.about-contact-box { max-width: 900px; margin: 0 auto; }
.about-contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.about-map-placeholder,
.about-map-embed { margin-top: 32px; background: #E8F0FE; border: 1px solid #CBD5E1; border-radius: 12px; min-height: 240px; display: flex; align-items: center; justify-content: center; color: #64748B; font-size: 15px; overflow: hidden; }
.about-map-embed iframe { width: 100%; height: 240px; border: 0; display: block; }
.about-cta { margin-top: 48px; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); border-radius: 12px; padding: 48px; text-align: center; color: #fff; }
.about-cta h2 { font-size: 24px; font-weight: 700; margin-bottom: 12px; color: #fff; }
.about-cta p { opacity: 0.9; margin-bottom: 24px; }
.contact-info-box { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-2xl); }
.contact-info-box h3 { font-size: 18px; font-weight: 600; color: var(--color-primary); margin-bottom: 16px; }
.contact-row { display: flex; align-items: flex-start; gap: var(--space-md); margin-bottom: var(--space-md); }
.contact-icon { width: 40px; height: 40px; border-radius: 50%; background: var(--color-primary); color: var(--color-white); display: flex; align-items: center; justify-content: center; font-size: 16px; flex-shrink: 0; overflow: hidden; }
.contact-icon.has-img { background: transparent; }
.contact-icon-img { max-width: 40px; max-height: 40px; object-fit: contain; }
.contact-detail label { font-size: 12px; color: var(--color-text-secondary); display: block; }
.contact-detail span { font-size: 15px; font-weight: 500; }

/* ========== FAQ ========== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-md); margin-bottom: var(--space-md); overflow: hidden; }
.faq-question { padding: var(--space-md) var(--space-lg); background: var(--color-white); font-size: 15px; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; transition: background 0.2s; }
.faq-question:hover { background: #EBF4FF; }
.faq-answer { padding: 0 var(--space-lg); max-height: 0; overflow: hidden; transition: all 0.3s; font-size: 14px; line-height: 1.7; color: var(--color-text-secondary); }
.faq-item.open .faq-answer { padding: var(--space-md) var(--space-lg); max-height: 600px; }
.faq-item.open .faq-question { background: #EBF4FF; color: var(--color-primary); }

/* ========== 404 ========== */
.error-404-header .error-404-code {
	font-size: 72px;
	font-weight: 800;
	letter-spacing: 4px;
	line-height: 1;
	margin-bottom: var(--space-md);
	opacity: 0.9;
}
.error-404-body { padding: var(--space-2xl) 0 var(--space-3xl); }
.error-404-actions {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-md);
	justify-content: center;
	align-items: center;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .product-grid { grid-template-columns: 1fr; }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; }
    .hero-slide h1 { font-size: 36px; }
    .hero-visual { display: none; }
}
@media (max-width: 768px) {
    .nav-menu, .lang-switcher { display: none; }
    .hamburger { display: block; }
    .hero-slide:not(.hero-slide--image) { min-height: 420px; padding: 0 var(--space-md); }
    .hero-slide:not(.hero-slide--image) { background-image: var(--hero-bg-mobile, var(--hero-bg, linear-gradient(135deg, var(--color-primary) 0%, var(--color-dark) 60%, var(--color-primary-dark) 100%))); }
    .hero-slide-img { width: 100%; height: auto; }
    .hero-slide h1 { font-size: 28px; }
    .hero-slide p { font-size: 15px; }
    .hero-actions { flex-direction: column; }
    .section { padding: var(--space-2xl) 0; }
    .section-title { font-size: 26px; }
    .solutions-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-nav-list { grid-template-columns: 1fr 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .page-header h1 { font-size: 28px; }
    .page-header { background-image: var(--page-header-bg-mobile, var(--page-header-bg, linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%))); }
    .about-stats { grid-template-columns: 1fr 1fr 1fr; }
    .about-contact-grid { grid-template-columns: 1fr; }
    .about-hero { padding: 36px 16px; }
    .timeline-seg { display: none; }
    .timeline-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .timeline-year { font-size: 19px; }
}
@media (max-width: 480px) {
    .advantages-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .about-stats { grid-template-columns: 1fr; }
    .hero-slide h1 { font-size: 24px; }
}

/* ========== 左侧微信二维码悬浮入口 ========== */
.qr-float {
	position: fixed;
	left: 0;
	top: 50%;
	transform: translateY(-50%);
	z-index: 1100;
}
.qr-float__btn {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 6px;
	width: 52px;
	padding: 14px 8px;
	border: none;
	border-radius: 0 10px 10px 0;
	background: var(--color-primary);
	color: #fff;
	cursor: pointer;
	font-family: var(--font-sans);
	box-shadow: 2px 4px 16px rgba(0, 47, 130, 0.22);
	transition: background 0.2s, transform 0.2s;
}
.qr-float__btn:hover,
.qr-float__btn:focus-visible {
	background: var(--color-primary-dark);
	outline: none;
}
.qr-float__btn[aria-expanded="true"] {
	background: var(--color-primary-dark);
}
.qr-float__icon {
	display: flex;
	align-items: center;
	justify-content: center;
}
.qr-float__text {
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 0.5px;
	text-orientation: mixed;
	line-height: 1;
}

.qr-modal[hidden] { display: none !important; }
.qr-modal {
	position: fixed;
	inset: 0;
	z-index: 1200;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 24px;
}
.qr-modal__backdrop {
	position: absolute;
	inset: 0;
	background: rgba(15, 23, 42, 0.45);
}
.qr-modal__panel {
	position: relative;
	z-index: 1;
	width: min(100%, 440px);
	background: #fff;
	border-radius: 14px;
	border: 1px solid var(--color-border);
	padding: 20px;
	text-align: center;
}
.qr-modal__close {
	position: absolute;
	top: 6px;
	right: 8px;
	width: 36px;
	height: 36px;
	border: none;
	background: transparent;
	color: #64748B;
	font-size: 28px;
	line-height: 1;
	cursor: pointer;
	border-radius: 8px;
	z-index: 2;
}
.qr-modal__close:hover,
.qr-modal__close:focus-visible {
	color: var(--color-primary);
	background: #EBF4FF;
	outline: none;
}
.qr-modal__img {
	display: block;
	width: 100%;
	max-width: 400px;
	height: auto;
	margin: 0 auto;
	border-radius: 8px;
}

@media (max-width: 480px) {
	.qr-float__btn { width: 44px; padding: 12px 6px; }
	.qr-float__text { font-size: 11px; }
	.qr-modal__panel { width: min(100%, 320px); padding: 16px; }
	.qr-modal__img { max-width: 280px; }
}