/* ============================================================
   音视频企业官网 —— 浅色企业风（参照 yinkevision 气质）
   蓝(#1456e6)主色 / 白底 / 深底页脚。占位模板，替换资料即可。
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-2: #f3f7fd;
  --surface: #ffffff;
  --surface-2: #f6faff;
  --border: #e6ecf5;
  --border-strong: #cdd9ee;
  --text: #16203a;
  --text-dim: #586379;
  --text-mute: #95a1b5;
  --primary: #1456e6;
  --primary-2: #0a9bd6;
  --primary-d: #0c3aa8;
  --glow: rgba(20, 86, 230, 0.22);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1200px;
  --nav-h: 70px;
  --shadow: 0 16px 40px rgba(20, 45, 95, 0.12);
  --shadow-sm: 0 8px 22px rgba(20, 45, 95, 0.08);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===================== 导航 ===================== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h); z-index: 100;
  display: flex; align-items: center;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s, box-shadow .3s;
}
.nav.scrolled { background: rgba(255, 255, 255, 0.96); border-bottom: 1px solid var(--border); box-shadow: 0 4px 20px rgba(20,45,95,.05); }
.nav .container { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  display: grid; place-items: center; color: #fff; font-size: 19px; font-weight: 900;
  box-shadow: 0 6px 16px var(--glow);
}
.brand .name { font-size: 19px; letter-spacing: .5px; line-height: 1.1; }
.brand .name small { display: block; font-size: 10.5px; color: var(--text-mute); font-weight: 600; letter-spacing: 2.5px; }
.brand .logo-img { height: 80px; width: auto; object-fit: contain; }
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  padding: 10px 16px; border-radius: 9px; font-size: 15.5px; color: var(--text-dim); font-weight: 500;
  position: relative; transition: color .2s, background .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); background: rgba(20,86,230,.07); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2)); border-radius: 2px;
}
.nav-right { display: flex; align-items: center; gap: 14px; }
.nav-tel { font-size: 14px; color: var(--text-dim); }
.nav-tel b { color: var(--primary); font-size: 16px; }
.nav-cta {
  padding: 9px 20px; border-radius: 999px; background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff !important; font-size: 14px; font-weight: 600; box-shadow: 0 8px 20px var(--glow);
  transition: transform .2s, box-shadow .2s;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 28px var(--glow); }
.nav-toggle { display: none; background: none; border: 0; color: var(--text); font-size: 26px; cursor: pointer; }

/* ===================== 通用 ===================== */
section { padding: 88px 0; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.section-head .eyebrow { display: inline-block; font-size: 13px; letter-spacing: 3px; text-transform: uppercase; color: var(--primary); margin-bottom: 12px; font-weight: 700; }
.section-head h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; letter-spacing: .5px; color: var(--text); }
.section-head h2 .hl { background: linear-gradient(120deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.section-head p { margin-top: 14px; color: var(--text-dim); font-size: 16px; }
.page-hero { padding: calc(var(--nav-h) + 56px) 0 52px; background: linear-gradient(120deg, #eaf1ff, #e3edff); border-bottom: 1px solid var(--border); }
.page-hero .crumbs { font-size: 13px; color: var(--text-mute); margin-bottom: 12px; }
.page-hero .crumbs a:hover { color: var(--primary); }
.page-hero h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: .5px; }
.page-hero p { margin-top: 14px; color: var(--text-dim); font-size: 16px; max-width: 720px; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 26px; border-radius: 999px; font-size: 15px; font-weight: 600; cursor: pointer; border: 1px solid transparent; transition: transform .2s var(--ease), box-shadow .2s, background .2s, border-color .2s; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; box-shadow: 0 10px 24px var(--glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px var(--glow); }
.btn-ghost { border-color: var(--border-strong); color: var(--text); background: #fff; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); background: rgba(20,86,230,.05); }
.btn .arrow { transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }
.more-link { display: inline-flex; align-items: center; gap: 6px; color: var(--primary); font-weight: 600; font-size: 14.5px; }
.more-link .arrow { transition: transform .25s var(--ease); }
.more-link:hover .arrow { transform: translateX(4px); }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ===================== 首页 Hero 轮播 ===================== */
.hero { padding-top: calc(var(--nav-h) + 24px); padding-bottom: 30px; }
.hero-slider { position: relative; border-radius: 22px; overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--border); }
.slide { position: absolute; inset: 0; min-height: 470px; display: flex; align-items: center; padding: 60px; opacity: 0; transition: opacity .8s var(--ease); }
.slide.active { opacity: 1; position: relative; }
.slide-bg { position: absolute; inset: 0; z-index: 0; background-size: cover; background-position: center; }
.slide-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(8,18,45,.62), rgba(8,18,45,.18) 60%, transparent); }
.slide-inner { position: relative; z-index: 2; max-width: 580px; }
.slide .tag { display: inline-block; padding: 6px 14px; border-radius: 999px; background: rgba(255,255,255,.18); backdrop-filter: blur(6px); font-size: 13px; letter-spacing: 1px; color: #fff; margin-bottom: 18px; }
.slide h1 { font-size: clamp(28px, 4.6vw, 48px); line-height: 1.16; font-weight: 800; color: #fff; letter-spacing: .5px; }
.slide p { margin: 18px 0 28px; font-size: 17px; color: rgba(255,255,255,.88); }
.hero-dots { position: absolute; bottom: 22px; left: 60px; z-index: 3; display: flex; gap: 10px; }
.hero-dots button { width: 34px; height: 4px; border-radius: 4px; border: 0; background: rgba(255,255,255,.4); cursor: pointer; transition: background .25s, width .25s; }
.hero-dots button.active { width: 54px; background: #fff; }
.hero-arrow { position: absolute; top: 50%; transform: translateY(-50%); z-index: 3; width: 46px; height: 46px; border-radius: 50%; border: 0; background: rgba(8,18,45,.35); backdrop-filter: blur(6px); color: #fff; font-size: 22px; cursor: pointer; transition: background .2s; }
.hero-arrow:hover { background: rgba(20,86,230,.8); }
.hero-arrow.prev { left: 18px; } .hero-arrow.next { right: 18px; }

/* ===================== 通用：关于/文案区 ===================== */
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 54px; align-items: center; }
.split.reverse > .split-media { order: 2; }
.split h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; line-height: 1.25; margin-bottom: 18px; }
.split p { color: var(--text-dim); font-size: 16px; margin-bottom: 14px; }
.split .media { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); aspect-ratio: 4/3; box-shadow: var(--shadow-sm); background-size: cover; background-position: center; }
.split .stats-inline { display: flex; gap: 28px; margin-top: 22px; }
.split .stats-inline .num { font-size: 30px; font-weight: 800; background: linear-gradient(120deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.split .stats-inline .label { font-size: 13px; color: var(--text-mute); }

/* ===================== 产品卡 ===================== */
.prod-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: transform .3s var(--ease), border-color .3s, box-shadow .3s; display: flex; flex-direction: column; }
.prod-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.prod-thumb { aspect-ratio: 4/3; background-size: cover; background-position: center; position: relative; }
.prod-thumb .prod-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.prod-thumb::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, rgba(8,18,45,.25)); }
.prod-body { padding: 18px 20px 22px; }
.prod-body .prod-en { font-size: 11.5px; letter-spacing: 1.5px; color: var(--text-mute); text-transform: uppercase; }
.prod-body h3 { font-size: 17px; margin: 4px 0 8px; font-weight: 700; }
.prod-body p { color: var(--text-dim); font-size: 13.8px; }
.prod-body .tags { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }
.prod-body .tags span { font-size: 12px; padding: 3px 10px; border: 1px solid var(--border); border-radius: 999px; color: var(--text-dim); }
.pd-note { color: var(--text-dim); font-size: 15px; line-height: 1.7; margin: 8px 0 0; }
.pd-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.pd-tags .tag { font-size: 12.5px; padding: 4px 13px; border: 1px solid var(--border); border-radius: 999px; color: var(--text-dim); background: var(--surface-2); }
.spec { margin-top: 20px; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.spec-row { display: flex; justify-content: space-between; gap: 18px; padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14px; }
.spec-row:last-child { border-bottom: none; }
.spec-row span { color: var(--text-mute); flex: 0 0 auto; }
.spec-row b { color: var(--text); font-weight: 600; text-align: right; }
.split .media.ph, .prod-thumb.ph { background: linear-gradient(135deg, #0d3fa8, #1f8fd6); }

/* ===================== 公司优势 ===================== */
.adv-card { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 26px; transition: transform .3s var(--ease), box-shadow .3s, border-color .3s; }
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--border-strong); }
.adv-card .ic { width: 54px; height: 54px; border-radius: 14px; background: linear-gradient(135deg, rgba(20,86,230,.14), rgba(10,155,214,.14)); display: grid; place-items: center; color: var(--primary); margin-bottom: 18px; }
.adv-card h3 { font-size: 19px; margin-bottom: 8px; }
.adv-card p { color: var(--text-dim); font-size: 14.5px; }

/* ===================== 方案卡 ===================== */
.sol-card { position: relative; border-radius: var(--radius); overflow: hidden; min-height: 210px; border: 1px solid var(--border); display: flex; flex-direction: column; justify-content: flex-end; padding: 24px; color: #fff; transition: transform .3s var(--ease), box-shadow .3s; }
.sol-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.sol-bg { position: absolute; inset: 0; z-index: 0; background-size: cover; background-position: center; }
.sol-shade { position: absolute; inset: 0; z-index: 1; background: linear-gradient(180deg, rgba(8,18,45,.1), rgba(8,18,45,.82)); }
.sol-inner { position: relative; z-index: 2; }
.sol-en { font-size: 11.5px; letter-spacing: 2px; color: rgba(255,255,255,.75); text-transform: uppercase; }
.sol-card h3 { font-size: 20px; margin: 3px 0 8px; }
.sol-card p { font-size: 13.5px; color: rgba(255,255,255,.82); max-height: 0; overflow: hidden; transition: max-height .4s var(--ease), margin .4s; }
.sol-card:hover p { max-height: 110px; margin-top: 4px; }

/* ===================== 案例卡 ===================== */
.case-card { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); background: var(--surface); transition: transform .3s var(--ease), box-shadow .3s, border-color .3s; }
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--border-strong); }
.case-thumb { aspect-ratio: 16/10; background-size: cover; background-position: center; }
.case-body { padding: 18px 22px 22px; }
.case-body .industry { font-size: 12px; color: var(--primary); letter-spacing: 1px; font-weight: 600; }
.case-body h3 { font-size: 18px; margin: 6px 0 8px; }
.case-body p { color: var(--text-dim); font-size: 14px; }
.case-body .date { color: var(--text-mute); font-size: 12.5px; margin-top: 10px; }

/* ===================== 筛选条 ===================== */
.filters { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 40px; }
.filters button { padding: 8px 18px; border-radius: 999px; border: 1px solid var(--border); background: #fff; color: var(--text-dim); cursor: pointer; font-size: 14px; transition: all .2s; }
.filters button:hover { color: var(--primary); border-color: var(--border-strong); }
.filters button.active { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; border-color: transparent; }

/* ===================== 关于页时间线 / 数据 ===================== */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-top: 50px; }
.metric { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 20px; text-align: center; }
.metric .num { font-size: 38px; font-weight: 800; background: linear-gradient(120deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.metric .label { color: var(--text-dim); margin-top: 6px; font-size: 14px; }
.timeline { max-width: 760px; margin: 40px auto 0; position: relative; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(180deg, var(--primary), var(--primary-2)); }
.timeline li { position: relative; padding: 0 0 28px 18px; }
.timeline li::before { content: ""; position: absolute; left: -28px; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid var(--primary); }
.timeline .y { font-weight: 700; color: var(--primary); }
.timeline .t { color: var(--text-dim); font-size: 15px; }

/* ===================== 联系页 ===================== */
.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; }
.contact-info { display: grid; gap: 16px; }
.contact-info .row { display: flex; gap: 16px; align-items: flex-start; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; }
.contact-info .row .ic { width: 42px; height: 42px; border-radius: 11px; background: linear-gradient(135deg, rgba(20,86,230,.14), rgba(10,155,214,.14)); display: grid; place-items: center; color: var(--primary); flex: none; }
.contact-info .row .k { font-size: 13px; color: var(--text-mute); }
.contact-info .row .v { font-size: 16px; font-weight: 600; }
.contact-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow-sm); }
.contact-form label { display: block; font-size: 14px; color: var(--text-dim); margin: 14px 0 6px; }
.contact-form input, .contact-form textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 15px; font-family: inherit; background: #fff; color: var(--text); transition: border-color .2s, box-shadow .2s; }
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--glow); }
.contact-form textarea { resize: vertical; min-height: 110px; }
.map { margin-top: 40px; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); aspect-ratio: 21/7; background: linear-gradient(135deg, #e8f0fb, #d6e6fb); position: relative; }
.map .pin { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-100%); }

/* ===================== 页脚 ===================== */
.footer { background: #0b1730; color: #c7d2e6; padding: 60px 0 28px; margin-top: 50px; }
.footer .top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; }
.footer .brand .logo-img { height: 48px; width: auto; }
.footer h4 { font-size: 15px; margin-bottom: 16px; color: #fff; }
.footer .links a { display: block; color: #aab8d4; font-size: 14px; padding: 6px 0; transition: color .2s; }
.footer .links a:hover { color: #fff; }
.footer .about-txt { color: #9fadc9; font-size: 14px; margin-top: 14px; }
.footer .qr { width: 110px; height: 110px; border-radius: 12px; background: #fff; padding: 8px; margin-top: 12px; }
.footer .bottom { margin-top: 40px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.1); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; color: #7e8db0; font-size: 13px; }

/* ===================== 滚动动画 ===================== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ===================== 响应式 ===================== */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .sol-grid, .adv-grid, .metrics { grid-template-columns: repeat(2, 1fr); }
  .split, .contact-grid { grid-template-columns: 1fr; }
  .split.reverse > .split-media { order: 0; }
  .footer .top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  section { padding: 60px 0; }
  .nav-right { display: none; }
  .nav-links { position: fixed; top: var(--nav-h); left: 0; right: 0; background: rgba(255,255,255,.98); flex-direction: column; align-items: stretch; padding: 14px; gap: 2px; border-bottom: 1px solid var(--border); display: none; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-tel { display: none; }
  .grid-2, .grid-3, .grid-4, .sol-grid, .adv-grid, .metrics { grid-template-columns: 1fr; }
  .slide { padding: 34px 24px; min-height: 380px; }
  .hero-dots { left: 24px; }
  .footer .top { grid-template-columns: 1fr; }
}