/* ============================================================
   八局西北·产品手册 H5  |  移动端优先
   色彩体系：主蓝 #005BAC / 深海军蓝 #0A1B3D / 强调青 #00BFFF
   ============================================================ */
:root {
  --navy: #0A1B3D;
  --navy-2: #051024;
  --blue: #005BAC;
  --cyan: #00BFFF;
  --bg: #F5F7FA;
  --card: #FFFFFF;
  --ink: #1F2937;
  --muted: #6B7280;
  --line: #E5EAF1;
  --cat-xzjc: #005BAC;
  --cat-jzgy: #0E8C7F;
  --cat-szcy: #5B4FC4;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(10, 27, 61, .08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  color: var(--ink);
  background: var(--navy-2);
  line-height: 1.75;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
.container { max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* ---------------- 通用标题 ---------------- */
.sec-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 24px; font-weight: 800; letter-spacing: 2px;
  color: var(--navy); margin-bottom: 22px;
}
.sec-title-bar {
  width: 6px; height: 24px; border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--blue));
  flex: none;
}
.sec-title.light { color: #fff; }

/* ---------------- 入场动画 ---------------- */
.rv { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rv { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; }
}

/* ============================================================
   封面屏
   ============================================================ */
.hero {
  position: relative; min-height: 100vh; min-height: 100svh;
  overflow: hidden;
  background: linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 70%);
  display: flex; flex-direction: column;
}
.hero-bg {
  position: absolute; inset: 0;
  background: url("../img/hero-bg.jpg") center 30% / cover no-repeat;
  opacity: .85;
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(5,16,36,.55) 0%, rgba(5,16,36,.15) 40%, rgba(5,16,36,.9) 100%);
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .5; pointer-events: none; }
.hero-glow-1 { width: 320px; height: 320px; left: -120px; top: 16%; background: rgba(0,191,255,.35); animation: glowPulse 6s ease-in-out infinite; }
.hero-glow-2 { width: 260px; height: 260px; right: -80px; top: 46%; background: rgba(0,91,172,.5); animation: glowPulse 7s ease-in-out 1.2s infinite; }
@keyframes glowPulse { 0%,100% { opacity: .35; transform: scale(1); } 50% { opacity: .6; transform: scale(1.12); } }
.hero-building {
  position: absolute; right: 0; bottom: 0;
  width: min(100%, 620px);
  opacity: .95;
  -webkit-mask-image: radial-gradient(130% 130% at 88% 100%, #000 52%, transparent 92%);
  mask-image: radial-gradient(130% 130% at 88% 100%, #000 52%, transparent 92%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; padding: max(11vh, 72px) 24px 0; }
.hero-kicker {
  display: inline-block; padding: 6px 16px;
  border: 1px solid rgba(0,191,255,.65); border-radius: 999px;
  color: var(--cyan); font-size: 13px; letter-spacing: 4px;
  background: rgba(0,191,255,.08);
  animation: fadeDown 1s ease both;
}
.hero-title {
  margin-top: 18px;
  font-size: clamp(34px, 9vw, 52px); font-weight: 900; letter-spacing: 3px;
  color: #fff; text-shadow: 0 4px 24px rgba(0,0,0,.35);
  animation: fadeDown 1s .15s ease both;
}
.hero-title .dot { color: var(--cyan); padding: 0 2px; }
.hero-sub {
  margin-top: 10px; color: rgba(255,255,255,.78);
  font-size: 15px; letter-spacing: 3px;
  animation: fadeDown 1s .3s ease both;
}
.hero-slogan {
  margin-top: 30px; width: min(80%, 380px);
  -webkit-mask-image: radial-gradient(110% 110% at 50% 50%, #000 62%, transparent 98%);
  mask-image: radial-gradient(110% 110% at 50% 50%, #000 62%, transparent 98%);
  animation: fadeDown 1.1s .5s ease both;
}
@keyframes fadeDown { from { opacity: 0; transform: translateY(-18px); } to { opacity: 1; transform: none; } }
.hero-scroll {
  position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%);
  z-index: 2; color: rgba(255,255,255,.85); font-size: 12px; letter-spacing: 2px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  text-shadow: 0 1px 8px rgba(0,0,0,.6);
}
.hero-scroll span {
  width: 18px; height: 30px; border: 1.5px solid rgba(255,255,255,.55); border-radius: 10px;
  position: relative;
}
.hero-scroll span::after {
  content: ""; position: absolute; left: 50%; top: 5px; width: 3px; height: 6px;
  margin-left: -1.5px; border-radius: 2px; background: var(--cyan);
  animation: scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot { 0% { transform: translateY(0); opacity: 1; } 80% { transform: translateY(11px); opacity: 0; } 100% { opacity: 0; } }

/* ============================================================
   科创理念（发布会风格）
   ============================================================ */
.vision {
  position: relative; overflow: hidden;
  background: linear-gradient(168deg, #0B1F45 0%, var(--navy) 45%, var(--navy-2) 100%);
  padding: 96px 0 88px;
}
.vision-glow { position: absolute; border-radius: 50%; filter: blur(70px); pointer-events: none; }
.v-glow-1 { width: 340px; height: 340px; left: -140px; top: 8%; background: rgba(0,191,255,.16); }
.v-glow-2 { width: 300px; height: 300px; right: -120px; bottom: 6%; background: rgba(0,91,172,.34); }
.vision-inner { position: relative; text-align: center; }
.vision-kicker {
  display: inline-block; font-size: 13px; color: var(--cyan);
  letter-spacing: 8px; text-indent: 8px; font-weight: 600;
  padding-bottom: 12px; position: relative;
}
.vision-kicker::after {
  content: ""; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 46px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--blue));
}
.vision-line {
  margin: 44px auto 0; max-width: 520px;
  font-size: clamp(20px, 5.6vw, 26px); font-weight: 700; line-height: 1.7;
  letter-spacing: 1.5px; color: #fff;
}
.vision-line .hl {
  font-weight: 900;
  background: linear-gradient(92deg, #8FE3FF 0%, var(--cyan) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.vision-divider {
  width: 1px; height: 54px; margin: 52px auto 0;
  background: linear-gradient(180deg, rgba(0,191,255,.7), transparent);
}
.vision-company {
  margin-top: 18px; text-align: center;
  font-size: 12px; color: rgba(255,255,255,.42); letter-spacing: 2px;
}

/* ============================================================
   产品导航
   ============================================================ */
.prodnav { background: var(--bg); padding: 54px 0 100px; }
.sec-desc { margin: -10px 0 22px; font-size: 13px; color: var(--muted); letter-spacing: .5px; }
.nav-group + .nav-group { margin-top: 30px; }
.nav-group-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 800; color: var(--navy); margin-bottom: 14px;
}
.nav-group-title b {
  width: 30px; height: 30px; border-radius: 9px; flex: none;
  display: grid; place-items: center;
  color: #fff; font-size: 14px;
  background: linear-gradient(135deg, var(--gc, var(--blue)), color-mix(in srgb, var(--gc, var(--blue)) 60%, var(--cyan)));
  box-shadow: 0 4px 10px color-mix(in srgb, var(--gc, var(--blue)) 35%, transparent);
}
.nav-group-title .ng-count { margin-left: auto; font-size: 12px; font-weight: 600; color: var(--muted); }
.nav-cards { display: grid; grid-template-columns: 1fr; gap: 12px; }
.nav-card {
  position: relative; display: flex; align-items: center; gap: 14px;
  background: #fff; border-radius: 16px;
  padding: 16px 14px 16px 20px;
  border: 1px solid var(--line); overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .22s ease;
}
.nav-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(180deg, var(--gc, var(--blue)), color-mix(in srgb, var(--gc, var(--blue)) 45%, var(--cyan)));
}
.nav-card:active { transform: scale(.98); }
.nav-card .nc-num {
  flex: none; width: 48px; text-align: center;
  font-family: "DIN Alternate", "Helvetica Neue", sans-serif;
  font-size: 27px; font-weight: 900; line-height: 1;
  background: linear-gradient(155deg, var(--gc, var(--blue)) 10%, color-mix(in srgb, var(--gc, var(--blue)) 40%, var(--cyan)) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.nav-card .nc-body { flex: 1; min-width: 0; }
.nav-card .nc-name { display: block; font-size: 16px; font-weight: 800; color: var(--navy); letter-spacing: .5px; }
.nav-card .nc-tag {
  display: -webkit-box; margin-top: 3px; font-size: 12px; color: var(--muted); line-height: 1.5;
  -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.nav-card .nc-arrow { flex: none; font-size: 22px; line-height: 1; color: #C3CBD8; }

/* ============================================================
   产品区
   ============================================================ */
.product { background: #fff; padding-bottom: 52px; border-top: 1px solid var(--line); }
.p-head {
  position: relative; overflow: hidden;
  background: linear-gradient(118deg, var(--navy) 20%, var(--catc, var(--blue)) 130%);
  padding: 44px 20px 58px; color: #fff;
}
.p-head::before {
  content: ""; position: absolute; inset: 0;
  background: url("../img/hero-bg.jpg") center / cover no-repeat;
  opacity: .14; mix-blend-mode: screen;
}
.p-head-inner { position: relative; max-width: 760px; margin: 0 auto; }
.p-cat-badge {
  display: inline-block; padding: 4px 14px; border-radius: 999px;
  font-size: 12px; letter-spacing: 2px; font-weight: 600;
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.35);
}
.p-name-row { display: flex; align-items: baseline; gap: 12px; margin-top: 14px; }
.p-num { font-size: 30px; font-weight: 900; color: var(--cyan); font-family: "DIN Alternate", "Helvetica Neue", sans-serif; }
.p-name { font-size: 26px; font-weight: 900; letter-spacing: 1px; }
.p-tagline { margin-top: 8px; font-size: 14px; color: rgba(255,255,255,.82); }
.p-ghost {
  position: absolute; right: -6px; top: -18px;
  font-size: 130px; font-weight: 900; line-height: 1;
  color: rgba(255,255,255,.07); font-family: "DIN Alternate", "Helvetica Neue", sans-serif;
  pointer-events: none; user-select: none;
}

/* 关键数据条 */
.stats-strip {
  position: relative; z-index: 3;
  max-width: 720px; margin: -30px auto 0; padding: 0 20px;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px;
  background: #fff; border-radius: var(--radius);
  box-shadow: 0 10px 34px rgba(10,27,61,.14);
  padding: 16px 14px;
}
.stat { text-align: center; padding: 6px 2px; }
.stat + .stat { border-left: 1px dashed var(--line); }
.stats-grid .stat:nth-child(3) { border-left: none; }
.stat b {
  display: block; font-size: 24px; font-weight: 900; line-height: 1.25;
  color: var(--catc, var(--blue));
  font-family: "DIN Alternate", "Helvetica Neue", sans-serif;
  white-space: nowrap;
}
.stat b .cnt { font-size: 24px; font-weight: 900; color: inherit; }
.stat b .suffix, .stat b .prefix { font-size: 14px; font-weight: 800; color: inherit; }
.stat > span { font-size: 12px; color: var(--muted); }
@media (min-width: 620px) {
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
  .stats-grid .stat:nth-child(3) { border-left: 1px dashed var(--line); }
}

.p-body { max-width: 760px; margin: 0 auto; padding: 30px 20px 0; }
.p-sub {
  font-size: 18px; font-weight: 800; color: var(--navy);
  padding: 10px 14px; margin: 26px 0 18px;
  background: linear-gradient(90deg, rgba(0,91,172,.08), transparent);
  border-left: 4px solid var(--catc, var(--blue));
  border-radius: 0 8px 8px 0;
}
.p-sub:first-child { margin-top: 0; }
.blk-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 16px; font-weight: 800; color: var(--navy);
  margin: 26px 0 12px;
}
.blk-title::before {
  content: ""; width: 18px; height: 18px; border-radius: 5px; flex: none;
  background: var(--catc, var(--blue));
  -webkit-mask: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2 22 22H2Z"/></svg>') center/contain no-repeat;
  mask: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2 22 22H2Z"/></svg>') center/contain no-repeat;
}
.blk-title.t-scene::before { background: var(--catc, var(--blue)); }
.blk-title.t-adv::before { background: linear-gradient(135deg, var(--catc, var(--blue)), var(--cyan)); }
.blk-title.t-case::before { background: var(--cyan); }
.p-text { font-size: 14.5px; color: #374151; text-align: justify; }
.p-text + .p-text { margin-top: 10px; }

/* 标签组 */
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tag-chip {
  padding: 5px 14px; border-radius: 999px; font-size: 12.5px; font-weight: 600;
  color: var(--catc, var(--blue));
  background: color-mix(in srgb, var(--catc, var(--blue)) 8%, #fff);
  border: 1px solid color-mix(in srgb, var(--catc, var(--blue)) 30%, #fff);
}

/* 图片网格 */
.img-grid {
  display: grid; gap: 10px; margin-top: 16px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.img-grid.cols-1 { grid-template-columns: 1fr; }
.img-grid figure { margin: 0; }
.img-grid .thumb {
  border-radius: 10px; overflow: hidden; background: var(--bg);
  border: 1px solid var(--line); cursor: zoom-in;
}
.img-grid img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; transition: transform .5s ease; }
.img-grid .thumb:active img { transform: scale(1.04); }
.img-grid figcaption { font-size: 12px; color: var(--muted); text-align: center; margin-top: 6px; }

/* 对比表 */
.table-note {
  font-size: 13px; color: var(--muted);
  background: var(--bg); border-radius: 8px; padding: 8px 12px; margin-bottom: 10px;
}
.table-wrap {
  position: relative; border-radius: 10px; overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-scroll::-webkit-scrollbar { height: 0; }
table.cmp { border-collapse: collapse; width: 100%; font-size: 13px; background: #fff; }
table.cmp.wide { min-width: 620px; }
table.cmp th, table.cmp td {
  padding: 10px 12px; text-align: left; vertical-align: top;
  border-bottom: 1px solid var(--line); line-height: 1.6;
}
table.cmp thead th {
  background: var(--navy); color: #fff; font-weight: 700;
  font-size: 12.5px; position: sticky; top: 0; min-width: 72px;
}
table.cmp td:first-child, table.cmp thead th:first-child {
  font-weight: 700; color: var(--navy); white-space: nowrap;
  background: #F8FAFD;
}
table.cmp.wide td:first-child, table.cmp.wide thead th:first-child {
  position: sticky; left: 0; z-index: 2;
  box-shadow: 2px 0 0 rgba(10,27,61,.06);
}
table.cmp tr:last-child td { border-bottom: none; }
table.cmp td.hl { background: rgba(0,91,172,.06); color: var(--blue); font-weight: 600; }
table.cmp td.hl:first-child { color: var(--navy); }
.swipe-hint {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  font-size: 12px; color: var(--muted); margin-top: 8px;
  transition: opacity .5s;
}
.swipe-hint.hide { opacity: 0; }
.swipe-hint::before, .swipe-hint::after { content: "‹"; animation: swipeL 1.4s ease-in-out infinite; }
.swipe-hint::after { content: "›"; animation: swipeR 1.4s ease-in-out infinite; }
@keyframes swipeL { 0%,100% { transform: translateX(0); } 50% { transform: translateX(-4px); } }
@keyframes swipeR { 0%,100% { transform: translateX(0); } 50% { transform: translateX(4px); } }

/* VS 卡片 */
.vs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.vs-card {
  background: var(--bg); border-radius: 10px; padding: 12px;
  border: 1px solid var(--line);
}
.vs-card b { display: block; font-size: 13px; color: var(--catc, var(--blue)); margin-bottom: 4px; }
.vs-card p { font-size: 12.5px; color: #4B5563; line-height: 1.6; }

/* 获奖证书 */
.award-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 16px;
}
.award-grid figure {
  margin: 0; background: #fff; border: 1px solid var(--line);
  border-radius: 10px; overflow: hidden; box-shadow: var(--shadow);
}
.award-grid .thumb { cursor: zoom-in; background: #fff; }
.award-grid img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; padding: 6px; }
.award-grid figcaption {
  font-size: 12.5px; font-weight: 700; color: var(--navy);
  text-align: center; padding: 6px 4px 10px;
}

/* ============================================================
   联系我们
   ============================================================ */
.contact {
  position: relative; overflow: hidden;
  background: linear-gradient(165deg, var(--navy) 0%, var(--navy-2) 75%);
  padding: 60px 0 calc(46px + env(safe-area-inset-bottom));
  color: #fff;
}
.contact-glow {
  position: absolute; width: 420px; height: 420px; right: -160px; top: -120px;
  background: radial-gradient(circle, rgba(0,191,255,.28), transparent 65%);
  pointer-events: none;
}
.contact-company { text-align: center; margin-bottom: 26px; }
.contact-logo {
  width: 96px; margin: 0 auto 16px; opacity: .95;
}
.c-name { font-size: 18px; font-weight: 800; letter-spacing: 1px; }
.c-name-en { font-size: 10px; color: rgba(255,255,255,.5); margin-top: 4px; letter-spacing: .3px; }
.contact-info { list-style: none; margin-bottom: 28px; }
.contact-info li {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 13.5px; color: rgba(255,255,255,.85);
  padding: 9px 0; border-bottom: 1px dashed rgba(255,255,255,.14);
}
.ci-icon { flex: none; }
.contact-persons { display: flex; flex-direction: column; gap: 12px; margin-bottom: 26px; }
.person-card {
  display: flex; align-items: center; gap: 14px;
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius); padding: 14px 16px;
  backdrop-filter: blur(6px); transition: background .25s;
}
.person-card:active { background: rgba(255,255,255,.14); }
.pc-avatar {
  flex: none; width: 48px; height: 48px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 20px; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}
.pc-info { flex: 1; min-width: 0; }
.pc-info strong { font-size: 16px; letter-spacing: 1px; }
.pc-info span { display: block; font-size: 12px; color: rgba(255,255,255,.65); margin-top: 1px; }
.pc-info em { display: block; font-style: normal; font-size: 14px; color: var(--cyan); font-weight: 700; margin-top: 2px; letter-spacing: .5px; }
.pc-call {
  flex: none; padding: 8px 18px; border-radius: 999px;
  font-size: 13px; font-weight: 700; color: var(--navy);
  background: linear-gradient(135deg, #7FDBFF, var(--cyan));
}
.pdf-btn {
  display: block; text-align: center;
  padding: 14px; border-radius: 999px;
  font-size: 15px; font-weight: 700; letter-spacing: 1px; color: #fff;
  border: 1.5px solid rgba(0,191,255,.7);
  background: rgba(0,191,255,.1);
  transition: background .25s;
}
.pdf-btn:active { background: rgba(0,191,255,.25); }
.copyright { margin-top: 30px; text-align: center; font-size: 11.5px; color: rgba(255,255,255,.4); letter-spacing: .5px; }

/* ============================================================
   浮动组件
   ============================================================ */
.share-fab {
  position: fixed; z-index: 60; top: calc(14px + env(safe-area-inset-top)); right: 14px;
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center;
  color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 6px 18px rgba(0,91,172,.45);
  transition: transform .2s;
}
.share-fab:active { transform: scale(.92); }
.dot-nav {
  position: fixed; z-index: 55; right: 7px; top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; gap: 9px; align-items: center;
}
.dot-nav a {
  width: 7px; height: 7px; border-radius: 4px;
  background: rgba(120,140,170,.45);
  transition: all .3s ease; position: relative;
}
.dot-nav a.on-dark { background: rgba(255,255,255,.4); }
.dot-nav a.active { height: 20px; background: linear-gradient(180deg, var(--cyan), var(--blue)); }
.dot-nav a::after {
  content: attr(data-label);
  position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
  padding: 3px 10px; border-radius: 6px; white-space: nowrap;
  font-size: 11px; color: #fff; background: rgba(10,27,61,.85);
  opacity: 0; pointer-events: none; transition: opacity .25s;
}
.dot-nav a.active::after { opacity: 1; }
.fab-stack {
  position: fixed; z-index: 58; right: 14px;
  bottom: calc(20px + env(safe-area-inset-bottom));
  display: flex; flex-direction: column; gap: 10px;
}
.fab {
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center;
  color: var(--blue); background: #fff;
  box-shadow: 0 6px 18px rgba(10,27,61,.22);
  transition: transform .2s, opacity .3s;
}
.fab:active { transform: scale(.92); }
.fab-phone { color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan)); }
#fabTop { opacity: 0; pointer-events: none; transform: translateY(8px); }
#fabTop.show { opacity: 1; pointer-events: auto; transform: none; }

/* ============================================================
   分享面板
   ============================================================ */
.sheet-mask {
  position: fixed; inset: 0; z-index: 70; background: rgba(5,12,28,.55);
  opacity: 0; pointer-events: none; transition: opacity .3s;
}
.sheet-mask.open { opacity: 1; pointer-events: auto; }
.share-sheet {
  position: fixed; z-index: 71; left: 0; right: 0; bottom: 0;
  background: #fff; border-radius: 20px 20px 0 0;
  padding: 20px 20px calc(16px + env(safe-area-inset-bottom));
  transform: translateY(105%); transition: transform .35s cubic-bezier(.32,.72,.33,1);
  max-width: 760px; margin: 0 auto;
}
.share-sheet.open { transform: none; }
.ss-title { text-align: center; font-size: 14px; font-weight: 700; color: var(--navy); margin-bottom: 18px; }
.ss-actions { display: flex; justify-content: space-around; }
.ss-btn { display: flex; flex-direction: column; align-items: center; gap: 8px; font-size: 13px; color: var(--ink); }
.ss-ico { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; }
.ss-cancel {
  display: block; width: 100%; margin-top: 18px; padding: 12px;
  border-radius: 12px; background: var(--bg);
  font-size: 15px; font-weight: 600; color: var(--muted);
}

/* ============================================================
   灯箱 & 海报 & Toast
   ============================================================ */
.lightbox {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(3,8,20,.94);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity .3s;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img { max-width: 94vw; max-height: 78vh; object-fit: contain; border-radius: 6px; }
.lb-caption { margin-top: 14px; font-size: 13px; color: rgba(255,255,255,.8); padding: 0 24px; text-align: center; }
.lb-close {
  position: absolute; top: calc(14px + env(safe-area-inset-top)); right: 16px;
  width: 40px; height: 40px; border-radius: 50%;
  color: #fff; font-size: 17px; background: rgba(255,255,255,.14);
}
.poster-modal {
  position: fixed; inset: 0; z-index: 92;
  background: rgba(3,8,20,.9);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  opacity: 0; pointer-events: none; transition: opacity .3s;
}
.poster-modal.open { opacity: 1; pointer-events: auto; }
.poster-modal img { width: min(82vw, 360px); border-radius: 10px; box-shadow: 0 16px 50px rgba(0,0,0,.5); }
.pm-tip { color: rgba(255,255,255,.85); font-size: 13px; }
.pm-close {
  padding: 10px 34px; border-radius: 999px;
  color: #fff; font-size: 14px; background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.3);
}
.toast {
  position: fixed; z-index: 99; left: 50%; bottom: 18%;
  transform: translateX(-50%) translateY(10px);
  padding: 10px 22px; border-radius: 999px;
  background: rgba(10,27,61,.9); color: #fff; font-size: 13.5px;
  opacity: 0; pointer-events: none; transition: all .3s; white-space: nowrap;
}
.toast.show { opacity: 1; transform: translateX(-50%); }

/* 桌面窄窗口保护 */
@media (min-width: 900px) {
  body { background: #E9EEF5; }
  .hero, .vision, .prodnav, .product, .contact { box-shadow: 0 0 40px rgba(10,27,61,.08); }
  .hero { min-height: 720px; }
}

/* 圆点导航在深色区时的适配 */
.dot-nav.over-dark a { background: rgba(255,255,255,.42); }
.dot-nav.over-dark a.active { background: linear-gradient(180deg, var(--cyan), var(--blue)); }

/* 触屏设备隐藏圆点导航的文字标签，避免遮挡正文 */
@media (hover: none), (pointer: coarse) {
  .dot-nav a::after { display: none; }
}


/* ============================================================
   微信分享引导蒙层
   ============================================================ */
.wx-guide {
  position: fixed; inset: 0; z-index: 96;
  background: rgba(4,10,24,.92);
  opacity: 0; pointer-events: none; transition: opacity .3s;
}
.wx-guide.open { opacity: 1; pointer-events: auto; }
.wx-guide-box {
  position: absolute; top: calc(24px + env(safe-area-inset-top)); right: 18px;
  text-align: right; color: #fff;
}
.wx-arrow { display: block; margin: 0 4px 6px auto; animation: wxFloat 1.6s ease-in-out infinite; }
@keyframes wxFloat { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.wx-guide-box p { font-size: 16.5px; line-height: 1.8; letter-spacing: .5px; }
.wx-guide-box b {
  display: inline-block; padding: 0 10px; border-radius: 8px;
  background: rgba(255,255,255,.16); font-size: 19px; letter-spacing: 2px;
}