:root {
      --bg:      #ffffff;
      --surface: #f7f7f8;
      --fg:      #1a1a1a;
      --muted:   #6b6b6b;
      --border:  #e5e5e5;
      --accent:  #1890ff;
      --accent-soft: color-mix(in oklch, var(--accent) 10%, transparent);
      --fg-soft:     color-mix(in oklch, var(--fg) 4%, transparent);
      --surface-alt: #f0f0f2;
      --surface-elevated: #ffffff;
      --font-display: 'Open Sans', system-ui, -apple-system, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
      --font-body:    'Open Sans', system-ui, -apple-system, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
      --font-mono:    ui-monospace, 'JetBrains Mono', 'SF Mono', Menlo, monospace;
      --fs-h1: clamp(36px, 5vw, 56px);
      --fs-h2: clamp(28px, 3.5vw, 42px);
      --fs-h3: 20px;
      --fs-lead: 18px;
      --fs-body: 16px;
      --fs-meta: 13px;
      --gap-xs: 8px;
      --gap-sm: 12px;
      --gap-md: 24px;
      --gap-lg: 40px;
      --gap-xl: 72px;
      --gap-2xl: 128px;
      --container: 1280px;
      --gutter: 48px;
      --radius: 8px;
      --radius-lg: 16px;
      --radius-xl: 24px;
    }

body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--font-body); font-size: var(--fs-body); line-height: 1.6; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

.section { padding-block: clamp(72px, 10vw, var(--gap-2xl)); }

.section-alt { background: var(--surface-alt); }

.section + .section { border-top: 1px solid var(--border); }

.section-header { margin-bottom: var(--gap-lg); }

.section-header h2 { margin-bottom: var(--gap-sm); }

.section-header .lead { margin-bottom: 0; }

.reveal { opacity: 0; transform: translateY(32px); transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.5s cubic-bezier(0.16, 1, 0.3, 1); }

.reveal-item { opacity: 0; transform: translateY(24px); transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1), transform 0.45s cubic-bezier(0.16, 1, 0.3, 1); }

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

h1, .h1 { font-family: var(--font-display); font-size: var(--fs-h1); font-weight: 700; line-height: 1.1; letter-spacing: -0.02em; }

h2, .h2 { font-family: var(--font-display); font-size: var(--fs-h2); font-weight: 700; line-height: 1.15; letter-spacing: -0.015em; }

h3, .h3 { font-family: var(--font-display); font-size: var(--fs-h3); font-weight: 600; line-height: 1.35; letter-spacing: -0.005em; }

.lead { font-size: var(--fs-lead); line-height: 1.65; color: var(--muted); max-width: 56ch; }

.eyebrow { font-family: var(--font-mono); font-size: 12px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin: 0 0 var(--gap-md); }

.meta { font-family: var(--font-mono); font-size: var(--fs-meta); color: var(--muted); }

.topnav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; height: 64px; background: transparent; border-bottom: 1px solid transparent; transition: background 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.4s, backdrop-filter 0.4s; }

.topnav nav a { font-size: 16px; font-weight: 500; color: rgba(255,255,255,0.55); transition: color 0.25s; position: relative; letter-spacing: 0.01em; }

.topnav nav a.active { color: #ffffff; }

.topnav.scrolled nav a.active { color: #1a1a1a; }

.topnav nav a.active::after { transform: scaleX(1); }

.topnav .nav-cta { font-size: 15px; font-weight: 600; color: #ffffff; padding: 10px 28px; border: 1px solid rgba(255,255,255,0.3); border-radius: var(--radius); transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1); letter-spacing: 0.02em; }

.topnav .nav-cta:active { transform: scale(0.96); transition-duration: 0.1s; }

.page-hero { position: relative; padding-top: 160px; padding-bottom: 80px; background: #000000; color: #ffffff; overflow: hidden; }

.page-hero::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(24,144,255,0.06) 0%, transparent 70%); pointer-events: none; }

.page-hero .container { position: relative; z-index: 1; }

.page-hero h1 { font-size: var(--fs-h1); font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; color: #ffffff; margin-bottom: var(--gap-sm); }

.page-hero .lead { font-size: var(--fs-lead); color: rgba(255,255,255,0.7); max-width: 640px; margin-top: var(--gap-md); line-height: 1.7; }

.page-hero .eyebrow { color: var(--accent); }

.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap-md); }

.platform-card { background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s, box-shadow 0.3s; display: flex; flex-direction: column; box-shadow: 0 1px 3px rgba(0,0,0,0.04); }

.platform-card:hover { transform: translateY(-4px); border-color: rgba(0,0,0,0.15); box-shadow: 0 4px 12px rgba(0,0,0,0.06); }

.platform-icon { width: 48px; height: 48px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; flex-shrink: 0; }

.platform-icon svg { width: 24px; height: 24px; stroke: var(--fg); fill: none; stroke-width: 1.6; }

.platform-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; line-height: 1.3; }

.platform-card p { font-size: 14px; color: var(--muted); line-height: 1.6; flex: 1; }

.platform-card .platform-tag { display: inline-block; font-family: var(--font-mono); font-size: 11px; color: var(--muted); letter-spacing: 0.06em; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }

.advantage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap-md); }

.advantage-item { padding: 32px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface-elevated); }

.advantage-item h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; }

.advantage-item p { font-size: 14px; color: var(--muted); line-height: 1.6; }

.advantage-number { font-family: var(--font-mono); font-size: 32px; font-weight: 700; color: var(--accent); margin-bottom: 12px; }

.arch-block { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--gap-md); }

.arch-layer { padding: 28px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface-elevated); text-align: center; }

.arch-layer h3 { font-size: 15px; font-weight: 600; margin-bottom: 12px; color: var(--accent); }

.arch-layer p { font-size: 14px; color: var(--muted); line-height: 1.6; }

.arch-layer ul { list-style: none; padding: 0; margin: 0; font-size: 14px; color: var(--muted); line-height: 2; }

.cta-section { text-align: center; padding-block: var(--gap-xl); }

.cta-section h2 { margin-bottom: var(--gap-sm); }

.cta-section .lead { margin: 0 auto var(--gap-lg); }

.btn { display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px; border-radius: var(--radius); border: 1px solid transparent; font-size: 16px; font-weight: 600; letter-spacing: 0.02em; transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1); }

.btn:active { transform: scale(0.97); transition-duration: 0.1s; }

.btn-primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.btn-primary:hover { background: transparent; color: var(--fg); border-color: var(--fg); }

.btn-primary:active { background: rgba(0,0,0,0.85); }

.btn-secondary { background: transparent; color: var(--fg); border-color: rgba(0,0,0,0.15); }

.btn-secondary:hover { border-color: rgba(0,0,0,0.4); background: rgba(0,0,0,0.04); }

.btn-secondary:active { background: rgba(0,0,0,0.06); border-color: rgba(0,0,0,0.3); }

.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.pagefoot { padding-block: var(--gap-xl); border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; background: var(--surface); }

.footer-inner { display: grid; grid-template-columns: 1.5fr auto auto auto; gap: var(--gap-xl); align-items: start; }

.footer-brand { font-family: var(--font-display); font-size: 18px; font-weight: 700; color: var(--fg); margin-bottom: 10px; }

.footer-col h4 { font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: rgba(0,0,0,0.45); margin-bottom: 16px; }

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

.footer-desc { max-width: 32ch; font-size: 13px; color: var(--muted); }

:focus { outline: none; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.btn:focus-visible { outline-offset: 4px; }

.topnav nav a:focus-visible { outline-offset: 6px; }

.nav-dropdown { position: relative; }

.nav-dropdown > a { display: inline-flex; align-items: center; gap: 4px; }

.nav-dropdown > a::before { content: ''; display: none; }

.nav-dropdown .dropdown-arrow { width: 8px; height: 8px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); transition: transform 0.25s; flex-shrink: 0; opacity: 0.6; }

.dropdown-menu { position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(4px); min-width: 180px; background: rgba(10,10,10,0.95); backdrop-filter: blur(20px) saturate(180%); -webkit-backdrop-filter: blur(20px) saturate(180%); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius); padding: 8px 0; opacity: 0; pointer-events: none; transition: opacity 0.2s, transform 0.2s, background 0.3s, border-color 0.3s; box-shadow: 0 8px 24px rgba(0,0,0,0.3); z-index: 120; }

.topnav.scrolled .dropdown-menu { background: rgba(255,255,255,0.98); border-color: var(--border); box-shadow: 0 8px 24px rgba(0,0,0,0.08); }

.nav-dropdown:hover .dropdown-menu, .nav-dropdown:focus-within .dropdown-menu { opacity: 1; pointer-events: auto; transform: translateX(-50%) translateY(0); }

.nav-dropdown:hover .dropdown-arrow { transform: rotate(-135deg) translateY(-2px); }

.dropdown-menu a { display: block; padding: 10px 20px; font-size: 14px; font-weight: 500; color: rgba(255,255,255,0.7); white-space: nowrap; transition: background 0.15s, color 0.15s; }

.dropdown-menu a:hover { background: rgba(255,255,255,0.08); color: #ffffff; }

.topnav.scrolled .dropdown-menu a:hover { background: var(--surface); color: var(--fg); }

.dropdown-menu a::after { display: none !important; }

.nav-toggle { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 40px; height: 40px; padding: 8px; border-radius: var(--radius); cursor: pointer; z-index: 110; }

.nav-toggle span { display: block; width: 100%; height: 2px; background: #ffffff; border-radius: 1px; transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s; transform-origin: center; }

.topnav.scrolled .nav-toggle span { background: var(--fg); }

.mobile-nav { display: none; }

@media (max-width: 1024px) { :root { --gutter: 32px; } }

@media (max-width: 920px) {
      .nav-toggle { display: flex; }
      .topnav nav { display: none; }
      .topnav > .container > .nav-cta { display: none; }
      .nav-toggle.active span { background: #ffffff !important; }
      .mobile-nav { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(20px) saturate(180%); -webkit-backdrop-filter: blur(20px) saturate(180%); border-bottom: 1px solid var(--border); padding: 16px var(--gutter) 24px; gap: 8px; opacity: 0; transform: translateY(-8px); pointer-events: none; transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), transform 0.3s cubic-bezier(0.16, 1, 0.3, 1); }
      .mobile-nav.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
      .mobile-nav nav { display: flex; flex-direction: column; gap: 0; }
      .mobile-nav nav a { font-size: 16px; font-weight: 500; color: rgba(0, 0, 0, 0.75); padding: 14px 0; border-bottom: 1px solid var(--border); transition: color 0.2s; }
      .mobile-nav nav a:last-child { border-bottom: none; }
      .mobile-nav nav a:hover { color: #1a1a1a; }
      .mobile-nav nav a.active { color: #1a1a1a; }
      .mobile-nav .nav-cta { margin-top: 12px; text-align: center; font-size: 15px; font-weight: 600; color: #1a1a1a; padding: 12px 28px; border: 1px solid rgba(0, 0, 0, 0.25); border-radius: var(--radius); transition: all 0.25s; }
      .mobile-nav .nav-cta:hover { background: #1a1a1a; color: #ffffff; border-color: #1a1a1a; }
      .platform-grid { grid-template-columns: repeat(2, 1fr); }
      .advantage-grid { grid-template-columns: repeat(2, 1fr); }
      .arch-block { grid-template-columns: repeat(2, 1fr); }
      .footer-inner { grid-template-columns: 1fr 1fr; gap: var(--gap-lg); }
      .footer-bottom { flex-direction: column; gap: var(--gap-sm); text-align: center; }
      :root { --gutter: 24px; }
      .dropdown-menu { position: static; transform: none; min-width: 0; background: transparent; backdrop-filter: none; -webkit-backdrop-filter: none; border: none; border-radius: 0; padding: 0 0 0 16px; box-shadow: none; max-height: 0; overflow: hidden; opacity: 1; pointer-events: auto; transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1); }
      .nav-dropdown.open .dropdown-menu, .nav-dropdown:hover .dropdown-menu, .nav-dropdown:focus-within .dropdown-menu { max-height: 600px; overflow-y: auto; transform: none; }
      .dropdown-menu a { padding: 10px 0; font-size: 14px; border-bottom: 1px solid var(--border); }
      .dropdown-menu a:last-child { border-bottom: none; }
    }

@media (max-width: 640px) {
      .platform-grid { grid-template-columns: 1fr; }
      .advantage-grid { grid-template-columns: 1fr; }
      .arch-block { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr; }
      .page-hero { padding-top: 120px; padding-bottom: 56px; }
      .cta-buttons { flex-direction: column; align-items: center; }
      .cta-buttons .btn { width: 100%; max-width: 320px; justify-content: center; }
    }

@media (prefers-reduced-motion: reduce) {
      .reveal, .reveal-item { opacity: 1 !important; transform: none !important; transition: none !important; }
      .platform-card { transition: none !important; }
    }

/* ===== un- · 一网统飞方案内容组件 ===== */

.un-stack { display: flex; flex-direction: column; gap: 10px; max-width: 880px; margin: 0 auto; }

.un-layer { display: grid; grid-template-columns: 150px 1fr; align-items: center; gap: var(--gap-md); padding: 18px 24px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface-elevated); }

.un-layer:nth-child(1) { background: color-mix(in oklch, var(--accent) 16%, #ffffff); }

.un-layer:nth-child(2) { background: color-mix(in oklch, var(--accent) 12%, #ffffff); }

.un-layer:nth-child(3) { background: color-mix(in oklch, var(--accent) 8%, #ffffff); }

.un-layer:nth-child(4) { background: color-mix(in oklch, var(--accent) 5%, #ffffff); }

.un-layer-name { font-weight: 700; font-size: 15px; color: var(--fg); }

.un-layer p { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.6; }

.un-img-pair { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap-sm); align-self: start; }

.un-spec-title { font-size: 18px; font-weight: 700; margin: var(--gap-lg) 0 var(--gap-md); padding-left: 14px; border-left: 4px solid var(--accent); line-height: 1.4; }

.un-spec-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 16px; margin-top: var(--gap-md); }

.un-spec-grid--half { max-width: 760px; }

.un-spec { display: grid; grid-template-columns: 148px 1fr; align-items: start; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface-elevated); }

.un-spec-k { padding: 10px 12px; background: color-mix(in oklch, var(--accent) 8%, #ffffff); font-size: 13px; font-weight: 600; color: rgba(0,0,0,0.72); }

.un-spec-v { padding: 10px 14px; font-size: 13px; color: rgba(0,0,0,0.78); line-height: 1.55; overflow-wrap: anywhere; }

.un-chips { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--gap-md); align-content: center; }

.un-chips li { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; padding: 22px 12px; background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); text-align: center; font-weight: 600; font-size: 15px; }

.un-chips img { height: 42px; width: auto; object-fit: contain; }

.un-shot-portrait img { aspect-ratio: auto; }

.swsoft-shot figcaption { margin-top: 10px; text-align: center; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; color: var(--muted); }

.un-shot-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap-md); margin-bottom: var(--gap-lg); }

.un-feat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--gap-md); }

.un-feat { background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; }

.un-feat h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }

.un-feat-lead { font-weight: 600; color: var(--accent); font-size: 14px; margin-bottom: 8px; }

.un-feat p:last-child { font-size: 14px; color: var(--muted); line-height: 1.65; }

.un-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface-elevated); }

.un-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 14px; }

.un-table th, .un-table td { padding: 14px 18px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); line-height: 1.65; }

.un-table thead th { background: color-mix(in oklch, var(--accent) 8%, #ffffff); font-size: 13px; letter-spacing: 0.04em; color: rgba(0,0,0,0.75); white-space: nowrap; }

.un-table tbody tr:last-child td { border-bottom: none; }

.un-table tbody tr:hover { background: rgba(24,144,255,0.03); }

.un-th-num, .un-td-num { width: 56px; text-align: center !important; font-family: var(--font-mono); color: var(--muted); }

.un-th-scene, .un-td-scene { width: 220px; font-weight: 600; color: var(--fg); }

.un-table tbody td:not(.un-td-num):not(.un-td-scene) { color: var(--muted); }

.un-case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap-md); }

.un-case { margin: 0; background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s; display: flex; flex-direction: column; }

.un-case:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(0,0,0,0.08); }

.un-case img { display: block; width: 100%; height: clamp(230px, 22vw, 310px); object-fit: cover; object-position: center; flex: none; }

.un-case figcaption { flex: 1; display: flex; align-items: center; padding: 16px 20px; font-size: 15px; font-weight: 600; line-height: 1.55; }

@media (max-width: 920px) {
      .un-layer { grid-template-columns: 118px 1fr; }
      .un-shot-row { grid-template-columns: 1fr; }
      .un-case-grid { grid-template-columns: repeat(2, 1fr); }
      .un-spec-grid { grid-template-columns: 1fr; }
      .un-chips { grid-template-columns: repeat(4, 1fr); }
    }

@media (max-width: 640px) {
      .un-layer { grid-template-columns: 1fr; gap: 6px; padding: 14px 18px; }
      .un-layer-name::before { content: ''; display: inline-block; width: 8px; height: 8px; margin-right: 8px; border-radius: 2px; background: var(--accent); }
      .un-img-pair { grid-template-columns: 1fr; }
      .un-case-grid { grid-template-columns: 1fr; }
      .un-feat-grid { grid-template-columns: 1fr; }
      .un-chips { grid-template-columns: repeat(2, 1fr); gap: var(--gap-sm); }
      .un-spec { grid-template-columns: 1fr; }
      .un-spec-k { border-bottom: 1px dashed var(--border); }
    }