/* =============================================
   安巢 AnNest 官网样式 · v2.0
   VI V2.0：主色 #147DC8 / 深蓝 #082F4F / 暖金 #F2B84B
   字标「安巢AnNest」· 标语「让科技守护每一盏孤灯」
   字体：Lato（拉丁）+ 系统中文
   ============================================= */

@font-face {
  font-family: 'Lato';
  src: url('../assets/vi/fonts/woff2/Lato-Regular.woff2') format('woff2'),
       url('../assets/vi/fonts/Lato-Regular.ttf') format('truetype');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Lato';
  src: url('../assets/vi/fonts/woff2/Lato-Bold.woff2') format('woff2'),
       url('../assets/vi/fonts/Lato-Bold.ttf') format('truetype');
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Lato';
  src: url('../assets/vi/fonts/woff2/Lato-Black.woff2') format('woff2'),
       url('../assets/vi/fonts/Lato-Black.ttf') format('truetype');
  font-weight: 900; font-style: normal; font-display: swap;
}

:root {
  /* VI V2.0 色板 */
  --c-primary: #147DC8;
  --c-primary-dark: #0F63A3;
  --c-primary-light: #3E9BDA;
  --c-deep: #082F4F;
  --c-deep-2: #0B3B60;
  --c-accent: #F2B84B;
  --c-ink: #212529;
  --c-muted: #6B7A89;
  --c-line: #E3EBF2;
  --c-soft: #F4F8FB;
  --c-soft-2: #EAF3FA;
  --c-white: #FFFFFF;

  --c-safe: #2E7D5B;
  --c-alert: #C62828;

  --shadow-sm: 0 1px 2px rgba(8, 47, 79, .06);
  --shadow-md: 0 4px 16px rgba(8, 47, 79, .08);
  --shadow-lg: 0 14px 44px rgba(8, 47, 79, .14);

  --radius: 14px;
  --radius-lg: 22px;
  --container: 1180px;
  --header-h: 66px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-brand: 'Lato', var(--font-sans);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.62;
  color: var(--c-ink);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, video { max-width: 100%; display: block; }
a { color: var(--c-primary); text-decoration: none; transition: color .15s; }
a:hover { color: var(--c-primary-dark); }
button { font-family: inherit; cursor: pointer; }

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

/* ============== 通用 ============== */
.section { padding: 96px 0; position: relative; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 40px); line-height: 1.25; margin: 14px 0 16px; color: var(--c-deep); letter-spacing: -.5px; font-weight: 700; }
.section-head p { color: var(--c-muted); font-size: 17px; margin: 0; }

.eyebrow {
  display: inline-block; font-family: var(--font-brand);
  font-size: 12.5px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase;
  color: #fff; background: var(--c-primary);
  padding: 7px 16px; border-radius: 100px;
}
.eyebrow--light { color: #CFE3F2; background: rgba(255,255,255,.12); }
.eyebrow--gold { color: #5C4308; background: var(--c-accent); }

/* ============== 按钮 ============== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 26px; border-radius: 11px; font-size: 15.5px; font-weight: 600;
  border: 2px solid transparent; transition: all .18s; line-height: 1;
}
.btn-primary { background: var(--c-primary); color: #fff; box-shadow: 0 6px 18px rgba(20,125,200,.28); }
.btn-primary:hover { background: var(--c-primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 10px 26px rgba(20,125,200,.34); }
.btn-gold { background: var(--c-accent); color: #5C4308; box-shadow: 0 6px 18px rgba(242,184,75,.32); }
.btn-gold:hover { background: #E9AC33; color: #5C4308; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn-ghost:hover { background: var(--c-primary); color: #fff; }
.btn-ghost--light { color: #fff; border-color: rgba(255,255,255,.55); }
.btn-ghost--light:hover { background: #fff; color: var(--c-primary); }
.btn-lg { padding: 17px 34px; font-size: 17px; border-radius: 13px; }

/* ============== Header ============== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h); background: rgba(255,255,255,.92);
  backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent; transition: box-shadow .2s, border-color .2s;
}
.site-header.is-scrolled { box-shadow: var(--shadow-sm); border-bottom-color: var(--c-line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand { display: flex; align-items: center; }
.brand-mark { display: inline-flex; align-items: center; }
.brand-img { height: 30px; width: auto; display: block; }
.nav { display: flex; gap: 30px; }
.nav a {
  position: relative; color: var(--c-ink); font-size: 15px; font-weight: 500; padding: 6px 0;
}
.nav a:hover { color: var(--c-primary); }
.nav a::after {
  content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--c-primary); transition: width .22s; border-radius: 2px;
}
.nav a:hover::after { width: 100%; }
.header-cta { display: inline-flex; align-items: center; gap: 10px; }
.header-tel { font-family: var(--font-brand); font-size: 14px; font-weight: 700; color: var(--c-deep); }

.nav-toggle {
  display: none; width: 42px; height: 42px; border: 0; background: transparent; position: relative;
}
.nav-toggle span {
  position: absolute; left: 10px; right: 10px; height: 2px; background: var(--c-deep);
  border-radius: 2px; transition: all .22s;
}
.nav-toggle span:nth-child(1) { top: 13px; }
.nav-toggle span:nth-child(2) { top: 20px; }
.nav-toggle span:nth-child(3) { top: 27px; }
.nav-toggle.is-open span:nth-child(1) { top: 20px; transform: rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { top: 20px; transform: rotate(-45deg); }

/* ============== Hero ============== */
.hero {
  position: relative; min-height: 92vh; display: flex; align-items: center;
  padding: calc(var(--header-h) + 40px) 0 70px; overflow: hidden;
  background: linear-gradient(155deg, #06263F 0%, #082F4F 45%, #0C4370 100%);
}
.hero-media { position: absolute; inset: 0; }
.hero-video, .hero-poster { width: 100%; height: 100%; object-fit: cover; }
.hero-poster { position: absolute; inset: 0; }
.hero-video { position: absolute; inset: 0; opacity: 0; transition: opacity .7s ease; }
.hero-video.is-playing { opacity: 1; }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(6,38,63,.94) 0%, rgba(8,47,79,.78) 45%, rgba(8,47,79,.42) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 660px; }
.hero-logo { height: clamp(44px, 6vw, 66px); width: auto; margin-bottom: 26px; }
.hero-slogan {
  font-size: clamp(30px, 5vw, 54px); line-height: 1.18; font-weight: 700;
  color: #fff; margin: 0 0 20px; letter-spacing: 1px;
}
.hero-slogan b { color: var(--c-accent); font-weight: 700; }
.hero-sub { font-size: clamp(15px, 2vw, 19px); color: #B9D3E8; margin: 0 0 34px; letter-spacing: .5px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats {
  display: flex; gap: 44px; list-style: none; padding: 0;
  margin: 52px 0 0; border-top: 1px solid rgba(255,255,255,.14); padding-top: 26px;
}
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-family: var(--font-brand); font-size: 30px; font-weight: 900; color: #fff; line-height: 1.1; }
.hero-stats span { font-size: 13.5px; color: #8FB2CE; margin-top: 3px; letter-spacing: .5px; }

.hero-scroll {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); z-index: 2;
  width: 24px; height: 40px; border: 2px solid rgba(255,255,255,.4); border-radius: 14px;
}
.hero-scroll span {
  position: absolute; top: 7px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 7px; background: #fff; border-radius: 2px; animation: hscroll 1.5s infinite;
}
@keyframes hscroll { 0% { opacity: 1; top: 7px; } 100% { opacity: 0; top: 22px; } }

/* ============== 三重守护 ============== */
.section-features { background: var(--c-white); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feature-card {
  position: relative; background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  padding: 34px 30px 30px; overflow: hidden; transition: transform .2s, box-shadow .2s;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--c-primary); transform: scaleX(0); transform-origin: left; transition: transform .3s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-card--accent { background: var(--c-soft); border-color: #CFE3F2; }
.feature-card--accent::before { background: var(--c-accent); }
.feature-icon {
  width: 58px; height: 58px; border-radius: 16px; background: var(--c-soft-2);
  color: var(--c-primary); display: flex; align-items: center; justify-content: center; margin-bottom: 20px;
}
.feature-card--accent .feature-icon { background: #FBEED3; color: #B8860B; }
.feature-icon svg { width: 30px; height: 30px; }
.feature-card h3 { font-size: 21px; margin: 0 0 12px; color: var(--c-deep); font-weight: 700; }
.feature-card p { color: var(--c-muted); margin: 0 0 16px; font-size: 15px; }
.feature-tag {
  display: inline-block; font-family: var(--font-brand); font-size: 12.5px; font-weight: 700;
  letter-spacing: .5px; color: var(--c-primary); background: var(--c-soft-2);
  padding: 5px 12px; border-radius: 100px;
}
.feature-card--accent .feature-tag { color: #8A6100; background: #FBEED3; }

/* ============== 离线隐私 ============== */
.section-privacy { background: var(--c-deep); overflow: hidden; }
.section-privacy::after {
  content: ''; position: absolute; right: -180px; top: -120px; width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(20,125,200,.35), transparent 68%); pointer-events: none;
}
.privacy-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 60px; align-items: center; position: relative; z-index: 2; }
.section-privacy h2 { color: #fff; font-size: clamp(26px, 3.4vw, 40px); line-height: 1.3; margin: 16px 0 18px; font-weight: 700; }
.section-privacy p { color: #B9D3E8; font-size: 17px; }
.check-list { list-style: none; padding: 0; margin: 30px 0 0; }
.check-list li {
  position: relative; padding: 13px 0 13px 34px; color: #DCEAF5; font-size: 15.5px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.check-list li:last-child { border-bottom: 0; }
.check-list li::before {
  content: ''; position: absolute; left: 0; top: 17px; width: 18px; height: 10px;
  border-left: 2.5px solid var(--c-accent); border-bottom: 2.5px solid var(--c-accent);
  transform: rotate(-45deg);
}
.privacy-visual { display: flex; justify-content: center; }
.lock-card {
  text-align: center; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--radius-lg); padding: 44px 34px; backdrop-filter: blur(6px);
}
.lock-card svg { width: 80px; height: 80px; margin: 0 auto 20px; color: var(--c-accent); }
.lock-card strong { display: block; font-size: 22px; color: #fff; margin-bottom: 6px; }
.lock-card span { color: rgba(255,255,255,.72); font-size: 14px; }

/* ============== 产品形态 ============== */
.section-form { background: var(--c-soft); }
.form-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.form-card {
  position: relative; background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  padding: 32px 28px; transition: transform .2s, box-shadow .2s;
}
.form-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.form-card--featured { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(20,125,200,.08); }
.form-card--soon { opacity: .82; }
.form-badge {
  position: absolute; top: 22px; right: 22px; font-family: var(--font-brand); font-size: 11.5px; font-weight: 700;
  letter-spacing: .5px; color: var(--c-muted); background: var(--c-soft-2); padding: 4px 11px; border-radius: 100px;
}
.form-badge--ready { color: #fff; background: var(--c-safe); }
.form-card h3 { font-size: 20px; margin: 0 0 12px; color: var(--c-deep); font-weight: 700; }
.form-card p { color: var(--c-muted); font-size: 14.5px; margin: 0 0 18px; min-height: 44px; }
.form-card ul { list-style: none; padding: 0; margin: 0 0 22px; }
.form-card ul li { position: relative; padding: 6px 0 6px 22px; font-size: 14px; color: #45566A; }
.form-card ul li::before {
  content: ''; position: absolute; left: 2px; top: 13px; width: 6px; height: 6px;
  background: var(--c-primary); border-radius: 50%;
}
.form-link { font-weight: 600; font-size: 15px; color: var(--c-primary); }
.form-soon-tag { font-family: var(--font-brand); font-size: 13px; font-weight: 700; color: var(--c-muted); }

/* ============== 使用场景 ============== */
.section-scenes { background: #fff; }
.scene-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.scene-card { margin: 0; border-radius: var(--radius-lg); overflow: hidden; position: relative; background: var(--c-deep); }
.scene-card img { height: 260px; width: 100%; object-fit: cover; opacity: .82; transition: transform .35s, opacity .35s; }
.scene-card:hover img { transform: scale(1.05); opacity: 1; }
.scene-card figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 40px 22px 20px;
  background: linear-gradient(transparent, rgba(6,28,48,.92)); color: #fff;
}
.scene-card h3 { margin: 0 0 5px; font-size: 18px; font-weight: 700; }
.scene-card p { margin: 0; font-size: 13.5px; color: #C2D6E8; }

/* ============== 价格 ============== */
.section-price { background: var(--c-white); }
.price-inner { max-width: 900px; margin: 0 auto; }
.price-head { text-align: center; margin-bottom: 48px; }
.price-head h2 { font-size: clamp(26px, 3.4vw, 40px); color: var(--c-deep); margin: 14px 0 14px; font-weight: 700; }
.price-head p { color: var(--c-muted); font-size: 17px; margin: 0; }
.price-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.price-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  padding: 36px 30px; text-align: center; transition: transform .2s, box-shadow .2s;
}
.price-card--featured { border-color: var(--c-primary); background: linear-gradient(180deg, #F4F8FB, #fff); box-shadow: 0 0 0 3px rgba(20,125,200,.08); }
.price-tier { font-family: var(--font-brand); font-size: 12.5px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--c-muted); }
.price-amount { display: flex; align-items: baseline; justify-content: center; gap: 3px; margin: 14px 0 6px; }
.price-amount .currency { font-size: 24px; color: var(--c-primary); font-weight: 600; }
.price-amount .num { font-family: var(--font-brand); font-size: 52px; font-weight: 900; color: var(--c-primary); letter-spacing: -1.5px; }
.price-note { color: var(--c-muted); font-size: 14px; margin: 0 0 22px; }
.price-card ul { list-style: none; padding: 22px 0 0; margin: 0; border-top: 1px solid var(--c-line); text-align: left; }
.price-card ul li { position: relative; padding: 8px 0 8px 26px; font-size: 14.5px; color: #45566A; }
.price-card ul li::before {
  content: ''; position: absolute; left: 2px; top: 14px; width: 8px; height: 8px;
  border-radius: 50%; background: var(--c-primary);
}

/* ============== 购买引导 ============== */
.section-buy { background: linear-gradient(155deg, #082F4F, #0C4370); position: relative; overflow: hidden; }
.section-buy::before {
  content: ''; position: absolute; left: -140px; bottom: -140px; width: 460px; height: 460px;
  background: radial-gradient(circle, rgba(242,184,75,.22), transparent 68%); pointer-events: none;
}
.buy-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; position: relative; z-index: 2; }
.buy-inner h2 { color: #fff; font-size: clamp(26px, 3.4vw, 38px); margin: 16px 0 18px; font-weight: 700; line-height: 1.28; }
.buy-inner > div > p { color: #B9D3E8; font-size: 16.5px; margin: 0 0 26px; }
.buy-steps { list-style: none; counter-reset: bs; padding: 0; margin: 0; }
.buy-steps li {
  counter-increment: bs; position: relative; padding: 16px 0 16px 54px; color: #DCEAF5; font-size: 15.5px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.buy-steps li:last-child { border-bottom: 0; }
.buy-steps li::before {
  content: counter(bs); position: absolute; left: 0; top: 14px; width: 34px; height: 34px;
  border-radius: 50%; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.22);
  color: #fff; font-family: var(--font-brand); font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}
.buy-card {
  background: #fff; border-radius: var(--radius-lg); padding: 38px 34px; text-align: center; box-shadow: var(--shadow-lg);
}
.buy-card .bc-price { font-family: var(--font-brand); font-size: 46px; font-weight: 900; color: var(--c-primary); letter-spacing: -1.5px; }
.buy-card .bc-price small { font-size: 20px; font-weight: 600; }
.buy-card .bc-sub { color: var(--c-muted); font-size: 14px; margin: 6px 0 24px; }
.buy-card .btn { width: 100%; }
.buy-card .bc-domain { font-family: var(--font-brand); font-size: 13px; color: var(--c-muted); margin-top: 14px; letter-spacing: .5px; }

/* ============== 下载 ============== */
.section-download { background: var(--c-white); }
.download-inner { max-width: 760px; margin: 0 auto; text-align: center; }
.download-inner h2 { font-size: clamp(26px, 3.4vw, 38px); color: var(--c-deep); margin: 0 0 14px; font-weight: 700; }
.download-inner > p { color: var(--c-muted); font-size: 16.5px; margin: 0 0 30px; }
.download-actions { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.download-meta { font-family: var(--font-brand); font-size: 12.5px; color: var(--c-muted); word-break: break-all; }
.download-steps {
  list-style: none; counter-reset: ds; padding: 0; margin: 42px 0 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; text-align: left;
}
.download-steps li {
  counter-increment: ds; position: relative; padding: 20px 18px 18px; background: var(--c-soft);
  border-radius: var(--radius); font-size: 14px; color: #45566A; border: 1px solid var(--c-line);
}
.download-steps li::before {
  content: '0' counter(ds); display: block; font-family: var(--font-brand); font-weight: 900;
  font-size: 20px; color: var(--c-primary); margin-bottom: 8px; letter-spacing: -.5px;
}

/* ============== 联系 ============== */
.section-contact { background: var(--c-soft); }
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact-inner h2 { font-size: clamp(24px, 3vw, 34px); color: var(--c-deep); margin: 14px 0 16px; font-weight: 700; }
.contact-inner > div > p { color: var(--c-muted); font-size: 16px; }
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 18px 0; border-bottom: 1px solid var(--c-line);
}
.contact-list li:last-child { border-bottom: 0; }
.cl-label { font-size: 13.5px; color: var(--c-muted); }
.contact-list a, .contact-list .cl-value { font-family: var(--font-brand); font-weight: 700; color: var(--c-deep); font-size: 15.5px; }

/* ============== Footer ============== */
.site-footer { background: var(--c-deep); color: #8FB2CE; padding: 56px 0 34px; }
.footer-inner { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: start; }
.footer-brand img { height: 34px; width: auto; margin-bottom: 16px; }
.footer-brand p { color: #B9D3E8; margin: 0; font-size: 14.5px; letter-spacing: .5px; }
.footer-slogan { font-size: 15px; letter-spacing: 6px; color: #CFE3F2; margin-top: 12px; }
.footer-meta { display: flex; flex-direction: column; gap: 9px; text-align: right; font-size: 12.5px; line-height: 1.7; }
.footer-meta a { color: #8FB2CE; }
.footer-meta a:hover { color: #fff; }
.footer-bottom {
  margin-top: 40px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.1);
  font-size: 12.5px; color: #6F94B2; text-align: center;
}

/* ============== 动效 ============== */
.fade-up { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.fade-up.is-visible { opacity: 1; transform: none; }

/* ============== 响应式 ============== */
@media (max-width: 980px) {
  .nav { display: none; }
  .nav.is-open {
    display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0;
    background: #fff; padding: 20px 24px 26px; gap: 4px; box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--c-line);
  }
  .nav.is-open a { padding: 12px 0; border-bottom: 1px solid var(--c-line); }
  .header-cta { display: none; }
  .nav-toggle { display: block; }
  .privacy-inner, .buy-inner, .contact-inner { grid-template-columns: 1fr; gap: 34px; }
  .feature-grid, .form-grid { grid-template-columns: 1fr; }
  .scene-grid { grid-template-columns: 1fr 1fr; }
  .price-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-meta { text-align: left; }
}
@media (max-width: 620px) {
  .section { padding: 68px 0; }
  .scene-grid { grid-template-columns: 1fr; }
  .download-steps { grid-template-columns: 1fr 1fr; }
  .hero-stats { gap: 28px; }
  .hero-stats strong { font-size: 25px; }
}