/* ============================================================
   山东夫子知新信息科技有限公司 · 官网
   纸墨底 + 夫子红 + 宋体 display；每产品屏注入各自真实品牌色
   ============================================================ */

:root {
  --paper: #f7f5f0;
  --paper-2: #fffefb;
  --ink: #1a1815;
  --ink-2: #6f6a62;
  --line: #e6e1d6;
  --red: #c81623;
  --red-deep: #9e0e19;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --accent: var(--red);
  --bg: var(--paper);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
  /* Firefox 细滚动条 */
  scrollbar-width: thin;
  scrollbar-color: rgba(26, 24, 21, 0.28) transparent;
}
/* JS 惯性滚动接管时关闭 CSS smooth 与 snap，避免双重干预 */
html.smooth-sections { scroll-behavior: auto; scroll-snap-type: none; }

/* WebKit 细滚动条：透明轨道 + 圆角拇指 + 品牌红 hover */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(26, 24, 21, 0.22);
  border-radius: 8px;
  border: 3px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: rgba(200, 22, 35, 0.55); border: 3px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-button, ::-webkit-scrollbar-corner { display: none; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 4px;
}
::selection { background: var(--red); color: #fff; }

/* ---------- 顶部进度条 ---------- */
.progress {
  position: fixed; top: 0; left: 0; z-index: 60;
  width: 100%; height: 2px; background: transparent;
}
.progress i {
  display: block; height: 100%; width: 0;
  background: var(--red);
  transition: width 0.15s linear;
}

/* ---------- 顶部导航 ---------- */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; gap: 12px;
  height: 64px; padding: 0 clamp(20px, 4vw, 48px);
  background: color-mix(in srgb, var(--paper) 72%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}
.topbar .logo {
  width: 34px; height: 34px; border-radius: 9px;
  box-shadow: 0 2px 8px rgba(20, 16, 10, 0.18);
}
.topbar .co {
  font-family: var(--serif); font-size: 15px; font-weight: 700; letter-spacing: 0.02em;
}
.topbar .co small {
  display: block; font-family: var(--mono); font-size: 9px; font-weight: 400;
  letter-spacing: 0.18em; color: var(--ink-2); margin-top: 1px;
}
.topbar nav { margin-left: auto; display: flex; gap: clamp(14px, 2.4vw, 30px); align-items: center; }
.topbar nav a {
  font-size: 13px; color: var(--ink-2); transition: color 0.2s;
}
.topbar nav a:hover { color: var(--ink); }
.topbar nav a.cta {
  color: #fff; background: var(--ink); padding: 8px 16px; border-radius: 999px;
  font-size: 12.5px; transition: background 0.2s;
}
.topbar nav a.cta:hover { background: var(--red); }

/* ---------- 右侧圆点导航 ---------- */
.dots {
  position: fixed; right: clamp(10px, 2vw, 26px); top: 50%; transform: translateY(-50%);
  z-index: 50; display: flex; flex-direction: column; gap: 10px;
  pointer-events: none;
}
.dots a {
  position: relative; display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; pointer-events: auto;
  font-size: 11px; color: var(--ink-2);
}
.dots a span {
  position: absolute; right: calc(100% + 2px);
  opacity: 0; transform: translateX(6px);
  transition: 0.25s var(--ease);
  background: color-mix(in srgb, var(--paper-2) 88%, transparent);
  border: 1px solid var(--line);
  padding: 3px 9px; border-radius: 6px;
  white-space: nowrap; pointer-events: none;
  box-shadow: 0 4px 14px rgba(20, 16, 10, 0.08);
}
.dots a i {
  width: 7px; height: 7px; border-radius: 50%;
  background: color-mix(in srgb, var(--ink-2) 45%, transparent);
  transition: 0.25s var(--ease); flex: none;
}
.dots a:hover span, .dots a:focus-visible span, .dots a.on span { opacity: 1; transform: none; }
.dots a.on i { background: var(--red); transform: scale(1.5); }

/* ---------- 屏 · 通用 ---------- */
.screen {
  position: relative;
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  scroll-snap-align: start; scroll-snap-stop: always;
  overflow: hidden;
  background: var(--bg);
}
.inner {
  width: min(1280px, 93vw); margin: 0 auto;
  padding: clamp(76px, 10vh, 110px) 0 clamp(36px, 6vh, 64px);
}
.screen.dark { color: #f3f0e9; }
.screen.dark { --ink: #f3f0e9; --ink-2: #a49e91; --line: rgba(255, 255, 255, 0.14); }

/* 入场动画（有 JS 时启用） */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); transition-delay: var(--d, 0s); }
.js .screen.active .reveal { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 首屏 ---------- */
.hero { background: var(--paper); }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(52% 40% at 78% 18%, rgba(200, 22, 35, 0.07), transparent 70%),
    radial-gradient(40% 34% at 12% 82%, rgba(200, 22, 35, 0.05), transparent 70%);
}
.hero .inner {
  display: grid; grid-template-columns: 7fr 5fr;
  gap: clamp(28px, 5vw, 72px); align-items: center;
}
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.22em;
  color: var(--red); margin-bottom: 22px;
  display: flex; align-items: center; gap: 12px;
}
.eyebrow::before { content: ""; width: 34px; height: 1px; background: var(--red); }
.hero h1 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(54px, 8.4vw, 118px);
  line-height: 1.08; letter-spacing: 0.04em;
}
.hero h1 em { font-style: normal; color: var(--red); }
.hero .sub {
  margin-top: 26px; font-size: clamp(15px, 1.6vw, 18px); line-height: 1.9;
  color: var(--ink-2); max-width: 34em;
}
.hero .sub strong { color: var(--ink); font-weight: 600; }
.hero .actions { margin-top: 40px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: 999px; font-size: 14.5px;
  transition: 0.25s var(--ease); border: 1px solid transparent;
}
.btn.solid { background: var(--red); color: #fff; box-shadow: 0 10px 26px rgba(200, 22, 35, 0.28); }
.btn.solid:hover { background: var(--red-deep); transform: translateY(-2px); }
.btn.ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn.ghost:hover { border-color: var(--ink); }
.hero .scroll-hint {
  margin-top: clamp(36px, 7vh, 72px);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.24em; color: var(--ink-2);
  display: flex; align-items: center; gap: 10px;
}
.hero .scroll-hint i {
  display: inline-block; width: 1px; height: 34px; background: var(--ink-2);
  animation: drip 1.8s var(--ease) infinite; transform-origin: top;
}
@keyframes drip { 0% { transform: scaleY(0); } 45% { transform: scaleY(1); } 100% { transform: scaleY(0); transform-origin: bottom; } }

.hero .brand { position: relative; display: flex; justify-content: center; }
.hero .brand .card {
  position: relative; background: #fff; border-radius: 34px;
  padding: clamp(28px, 3.4vw, 48px);
  box-shadow: 0 30px 80px rgba(30, 20, 10, 0.14), 0 2px 0 rgba(255, 255, 255, 0.9) inset;
  border: 1px solid rgba(230, 225, 214, 0.9);
}
.hero .brand img { width: clamp(180px, 20vw, 290px); border-radius: 22px; }
.hero .brand .seal {
  position: absolute; right: -22px; bottom: -22px;
  width: 84px; height: 84px; border-radius: 14px;
  background: var(--red); color: #fff;
  display: grid; grid-template-columns: 1fr 1fr; place-items: center;
  font-family: var(--serif); font-size: 25px; font-weight: 700; line-height: 1;
  transform: rotate(-5deg);
  box-shadow: 0 14px 30px rgba(200, 22, 35, 0.35);
  padding: 10px;
}
.hero .vertical {
  position: absolute; left: clamp(6px, 1.5vw, 22px); top: 50%; transform: translateY(-50%);
  writing-mode: vertical-rl; font-family: var(--serif);
  font-size: 13px; letter-spacing: 0.42em; color: color-mix(in srgb, var(--ink-2) 55%, transparent);
}

/* ---------- 业务屏 ---------- */
.biz .inner { display: block; }
.sec-head { max-width: 720px; margin-bottom: clamp(30px, 5vh, 54px); }
.sec-head .no {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.24em; color: var(--red);
  display: flex; align-items: center; gap: 12px; margin-bottom: 18px;
}
.sec-head .no::before { content: ""; width: 34px; height: 1px; background: var(--red); }
.sec-head h2 { font-family: var(--serif); font-size: clamp(34px, 4.6vw, 56px); font-weight: 900; letter-spacing: 0.02em; }
.sec-head p { margin-top: 16px; color: var(--ink-2); line-height: 1.9; font-size: 15.5px; }
.biz-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(18px, 2.6vw, 30px); }
.biz-card {
  position: relative; border: 1px solid var(--line); border-radius: 24px;
  background: var(--paper-2); padding: clamp(26px, 3vw, 40px);
  overflow: hidden; transition: 0.35s var(--ease); display: flex; flex-direction: column;
}
.biz-card:hover { transform: translateY(-4px); box-shadow: 0 24px 60px rgba(30, 20, 10, 0.1); }
.biz-card .glyph {
  position: absolute; right: -8px; top: -26px;
  font-family: var(--serif); font-size: 130px; font-weight: 900;
  color: color-mix(in srgb, var(--accent) 9%, transparent); pointer-events: none;
}
.biz-card h3 { font-family: var(--serif); font-size: clamp(24px, 2.6vw, 32px); font-weight: 900; }
.biz-card h3 span { color: var(--accent); }
.biz-card > p { margin: 14px 0 22px; color: var(--ink-2); line-height: 1.9; font-size: 14.5px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips b {
  font-weight: 500; font-size: 12.5px; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 13px;
  background: color-mix(in srgb, var(--paper) 60%, transparent);
}
.biz-link {
  display: inline-flex; margin-top: auto; padding-top: 24px; align-items: center; gap: 8px;
  color: var(--accent); font-size: 13px; font-weight: 650;
}
.solution-index {
  display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 10px;
  margin-top: clamp(22px, 3vh, 32px);
}
.solution-index a {
  min-height: 88px; padding: 16px 14px; border: 1px solid var(--line);
  border-radius: 14px; background: color-mix(in srgb, var(--paper-2) 78%, transparent);
  transition: 0.25s var(--ease);
}
.solution-index a:hover { border-color: color-mix(in srgb, var(--red) 48%, var(--line)); transform: translateY(-2px); }
.solution-index span { display: block; font-family: var(--serif); font-size: 17px; font-weight: 700; }
.solution-index small { display: block; margin-top: 7px; color: var(--ink-2); font-size: 11px; line-height: 1.5; }
.biz-strip {
  margin-top: clamp(18px, 3vh, 28px);
  display: flex; flex-wrap: wrap; gap: 10px 26px; align-items: center;
  border-top: 1px solid var(--line); padding-top: 22px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.14em; color: var(--ink-2);
}
.biz-strip b { color: var(--ink); font-weight: 600; }

/* ---------- 产品屏 ---------- */
.product { --bg: color-mix(in srgb, var(--accent) 5%, var(--paper)); }
.product::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(46% 38% at 82% 16%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 70%);
}
.product .inner {
  display: grid; grid-template-columns: 5fr 7fr;
  gap: clamp(24px, 4vw, 60px); align-items: center;
  position: relative;
}
.product.flip .col-text { order: 2; }
.product.flip .col-media { order: 1; }

/* 超大描边序号水印 */
.wm {
  position: absolute; top: clamp(60px, 9vh, 100px); right: 0;
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(120px, 17vw, 230px); line-height: 1;
  color: transparent; -webkit-text-stroke: 1.5px color-mix(in srgb, var(--accent) 38%, transparent);
  opacity: 0.55; pointer-events: none; user-select: none;
}
.product.flip .wm { right: auto; left: 0; }

.p-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.p-no { font-family: var(--mono); font-size: 13px; letter-spacing: 0.2em; color: var(--accent); font-weight: 700; }
.p-line { width: 34px; height: 1px; background: var(--accent); }
.p-badge {
  font-size: 11.5px; letter-spacing: 0.12em; color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  border-radius: 999px; padding: 5px 12px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}
.col-text h3 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(34px, 4vw, 54px); letter-spacing: 0.02em; line-height: 1.15;
}
.p-tag {
  margin-top: 12px; font-family: var(--serif);
  font-size: clamp(16px, 1.8vw, 20px); color: var(--accent); letter-spacing: 0.02em;
}
.p-desc { margin-top: 18px; color: var(--ink-2); line-height: 1.95; font-size: 15px; max-width: 36em; }
.p-tags { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 8px; }
.p-tags b {
  font-weight: 500; font-size: 12.5px;
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 13px;
  color: var(--ink-2); background: color-mix(in srgb, var(--paper-2) 55%, transparent);
}
.dark .p-tags b { background: rgba(255, 255, 255, 0.04); }
.p-ends {
  margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.14em; color: var(--ink-2);
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.p-ends em { font-style: normal; color: var(--accent); }

/* ---------- 设备框 ---------- */
.col-media { position: relative; }
.comp { position: relative; }

/* 浏览器框 */
.browser {
  border-radius: 14px; overflow: hidden;
  background: #fff;
  border: 1px solid rgba(24, 20, 14, 0.1);
  box-shadow: 0 30px 70px rgba(24, 18, 10, 0.22), 0 4px 16px rgba(24, 18, 10, 0.1);
}
.browser .bar {
  height: 34px; display: flex; align-items: center; gap: 8px;
  background: #eceae6; padding: 0 14px;
}
.dark .browser .bar { background: #23262c; }
.browser .bar i { width: 9px; height: 9px; border-radius: 50%; background: #d3cfc8; flex: none; }
.dark .browser .bar i { background: #454a52; }
.browser .bar i:first-child { background: #e2605c; }
.browser .bar i:nth-child(2) { background: #e8b94f; }
.browser .bar i:nth-child(3) { background: #6fbf6a; }
.browser .bar u {
  margin-left: 8px; flex: 1; max-width: 46%; height: 20px; border-radius: 6px;
  background: rgba(255, 255, 255, 0.75);
  font-family: var(--mono); font-size: 10px; color: var(--ink-2);
  display: flex; align-items: center; padding: 0 10px; text-decoration: none;
  overflow: hidden; white-space: nowrap;
}
.dark .browser .bar u { background: rgba(255, 255, 255, 0.08); color: #8f959e; }
.browser img { width: 100%; height: auto; }

/* 手机框（截图内容本身无壳时使用）— 适中边框 + 暖银金属质感 */
.phone {
  position: relative;
  border-radius: 34px;
  padding: 5.5px;
  /* 暖银 / 香槟金属：少灰、多高光 */
  background:
    linear-gradient(
      148deg,
      #fffaf4 0%,
      #f0e6d8 12%,
      #c4b5a2 28%,
      #f7f0e6 44%,
      #8f7f6c 58%,
      #e8dccb 74%,
      #a89884 88%,
      #f3ebe0 100%
    );
  box-shadow:
    0 22px 48px rgba(24, 18, 10, 0.28),
    0 1px 0 rgba(255, 250, 242, 0.9) inset,
    0 -1px 0 rgba(60, 45, 30, 0.28) inset,
    inset 1.5px 0 2px rgba(255, 248, 238, 0.55),
    inset -1.5px 0 2.5px rgba(50, 38, 24, 0.28),
    0 0 0 0.5px rgba(110, 90, 70, 0.28);
}
/* 屏幕与金属之间的细深色玻璃边（偏暖深棕黑，不发灰） */
.phone::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 30px;
  background: linear-gradient(165deg, #2a2420 0%, #12100e 50%, #1c1814 100%);
  z-index: 0;
  pointer-events: none;
  box-shadow:
    0 0 0 0.5px rgba(255, 240, 220, 0.08) inset,
    0 0 0 0.5px rgba(0, 0, 0, 0.5);
}
.phone .scr {
  position: relative;
  z-index: 1;
  border-radius: 29px;
  overflow: hidden;
  background: #141210;
}
/* 暖深色灵动岛 */
.phone .scr::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 28%;
  height: 13px;
  border-radius: 10px;
  z-index: 2;
  background: linear-gradient(180deg, #2c2622 0%, #161210 55%, #0c0a08 100%);
  box-shadow:
    0 0 0 0.5px rgba(220, 200, 175, 0.22),
    0 0 0 0.5px rgba(255, 245, 230, 0.1) inset,
    0 1px 2px rgba(0, 0, 0, 0.4);
}
.phone img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }

/* 已带手机壳的截图（曲园乐动） */
.shot { border-radius: 30px; overflow: hidden; box-shadow: 0 26px 60px rgba(24, 18, 10, 0.3); }
.shot img { width: 100%; height: auto; }

/* 组合：桌面主图 + 手机叠放 */
.comp-dm .browser { width: 100%; }
.comp-dm .phone {
  position: absolute; right: -3%; bottom: -6%;
  width: clamp(124px, 23%, 180px);
}
.comp-dm .phone .scr { aspect-ratio: 390 / 760; }

/* 组合：双桌面 */
.comp-dd .browser.main { width: 100%; position: relative; z-index: 2; }
.comp-dd .browser.sub {
  position: absolute; left: -7%; bottom: -11%; width: 52%; z-index: 3;
}
/* 组合：上主图 + 下双桌面（不叠压，三图全可见） */
.comp-d-dd {
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 1.4vw, 16px);
}
.comp-d-dd .browser.main { width: 100%; }
.comp-d-dd .pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(10px, 1.4vw, 16px);
}
.comp-d-dd .pair .browser { min-width: 0; }
.comp-d-dd .browser .bar { height: 28px; padding: 0 10px; }
.comp-d-dd .browser .bar i { width: 7px; height: 7px; }
.comp-d-dd .browser .bar u { height: 16px; font-size: 9px; max-width: 62%; padding: 0 8px; }

/* 组合：上主桌面 + 下「桌面 + 手机」 */
.comp-d-dm {
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 1.4vw, 16px);
}
.comp-d-dm .browser.main { width: 100%; }
.comp-d-dm .row {
  display: flex;
  align-items: flex-start;
  gap: clamp(10px, 1.4vw, 16px);
}
.comp-d-dm .row .browser {
  flex: 1;
  min-width: 0;
}
.comp-d-dm .row .phone {
  width: 28%;
  flex: none;
  align-self: stretch;
}
.comp-d-dm .row .phone .scr {
  height: 100%;
  aspect-ratio: 9 / 16;
}
.comp-d-dm .row .phone .scr img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}
.comp-d-dm .browser .bar { height: 28px; padding: 0 10px; }
.comp-d-dm .browser .bar i { width: 7px; height: 7px; }
.comp-d-dm .browser .bar u { height: 16px; font-size: 9px; max-width: 62%; padding: 0 8px; }

/* 产品区 CTA */
.p-actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 12px; }
.p-actions .btn.solid {
  background: var(--accent, var(--red));
  box-shadow: 0 10px 26px color-mix(in srgb, var(--accent, var(--red)) 32%, transparent);
}
.p-actions .btn.solid:hover {
  filter: brightness(0.94);
  background: var(--accent, var(--red-deep));
}
.p-actions .btn.ghost { background: color-mix(in srgb, var(--paper-2) 62%, transparent); }
.dark .p-actions .btn.ghost { background: rgba(255, 255, 255, 0.04); }
/* 组合：三手机 */
.comp-mmm { display: flex; justify-content: center; align-items: flex-start; gap: clamp(12px, 2vw, 24px); }
.comp-mmm .phone { width: 31%; }
.comp-mmm .phone:nth-child(2) { transform: translateY(7%); }
.comp-mmm .phone .scr { aspect-ratio: 390 / 780; }

/* 组合：双手机 */
.comp-mm { display: flex; justify-content: center; align-items: flex-start; gap: clamp(14px, 2.4vw, 28px); }
.comp-mm .phone { width: 42%; }
.comp-mm .phone:nth-child(2) { transform: translateY(9%); }
.comp-mm .phone .scr { aspect-ratio: 390 / 780; }

/* 组合：双带壳手机 + 桌面 */
.comp-mmd { display: flex; align-items: flex-start; gap: clamp(12px, 2vw, 22px); }
.comp-mmd .shot { width: 34%; flex: none; }
.comp-mmd .shot:nth-child(2) { transform: translateY(6%); }
.comp-mmd .browser {
  position: absolute; right: 0; bottom: -8%; width: 56%; z-index: 3;
}

/* 夫子校园：保留完整 H5 画面和底部导航 */
.campus .phone img { object-fit: contain; }
.campus .phone .scr::before { top: 1.5%; height: 2%; }
.campus-media-note {
  margin-top: clamp(24px, 4vw, 48px); text-align: center;
  color: var(--ink-2); font-size: 11px; line-height: 1.6;
}

/* 无人车监管：监控界面与数据大屏 */
.vehicle .inner { grid-template-columns: 7fr 5fr; }
.vehicle .browser .bar u { max-width: 78%; }
.vehicle .p-actions .btn.solid { background: #326bc9; }
.vehicle-media-note { margin-top: 72px; color: var(--ink-2); font-size: 11px; line-height: 1.6; }

/* 智慧后勤：模块原型切换 */
.logistics .col-media { min-width: 0; }
.logistics-panel[hidden] { display: none; }
.logistics-gallery .browser {
  box-shadow: 0 22px 54px rgba(10, 64, 62, 0.14), 0 4px 14px rgba(24, 18, 10, 0.06);
}
.logistics-gallery .browser .bar u { max-width: 78%; }
.logistics-caption {
  min-height: 3.6em; margin-top: 16px;
  color: var(--ink-2); font-size: 13px; line-height: 1.8;
}
.logistics-tabs { display: none; }
.js .logistics-tabs {
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px;
  margin-top: 12px;
}
.logistics-tabs button {
  min-height: 44px; padding: 8px 6px; border: 1px solid var(--line); border-radius: 10px;
  font-family: var(--sans); font-size: 12px; color: var(--ink-2);
  background: color-mix(in srgb, var(--paper-2) 70%, transparent);
  cursor: pointer; transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.logistics-tabs button:hover { border-color: var(--accent); color: var(--accent); }
.logistics-tabs button[aria-selected="true"] {
  border-color: var(--accent); color: #fff; background: var(--accent);
}
.logistics-tabs button:focus-visible { outline-color: var(--accent); }
.logistics-note { margin-top: 14px; color: var(--ink-2); font-size: 11px; line-height: 1.6; }
.logistics-hint { display: none; }
.js .logistics-hint { display: inline; }

/* ---------- 关于屏 ---------- */
.about .inner { display: block; }
.about-grid { display: grid; grid-template-columns: 6fr 6fr; gap: clamp(24px, 4vw, 60px); align-items: start; }
.about .story { color: var(--ink-2); line-height: 2.05; font-size: 15px; }
.about .story p + p { margin-top: 14px; }
.about .story strong { color: var(--ink); }
.values { display: grid; gap: 14px; }
.value {
  display: flex; gap: 18px; align-items: baseline;
  border: 1px solid var(--line); border-radius: 18px; background: var(--paper-2);
  padding: 20px 24px; transition: 0.3s var(--ease);
}
.value:hover { transform: translateX(6px); border-color: color-mix(in srgb, var(--red) 40%, var(--line)); }
.value b { font-family: var(--serif); font-size: 24px; color: var(--red); flex: none; }
.value div p { color: var(--ink-2); font-size: 13.5px; line-height: 1.8; margin-top: 4px; }
.value div span { font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; color: var(--ink-2); }

/* ---------- 联系 / 页脚 ---------- */
.contact { background: #16120e; color: #f3f0e9; }
.contact .inner { text-align: center; display: block; }
.contact .seal {
  width: 72px; height: 72px; margin: 0 auto 28px; border-radius: 12px;
  background: var(--red); color: #fff; transform: rotate(-4deg);
  display: grid; grid-template-columns: 1fr 1fr; place-items: center;
  font-family: var(--serif); font-size: 21px; font-weight: 700; padding: 8px;
  box-shadow: 0 14px 40px rgba(200, 22, 35, 0.4);
}
.contact h2 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(30px, 4.4vw, 52px); line-height: 1.4; letter-spacing: 0.03em;
}
.contact h2 em { font-style: normal; color: #ff4d59; }
.contact .co-name { margin-top: 26px; font-family: var(--serif); font-size: 17px; letter-spacing: 0.1em; }
.contact-lead { max-width: 520px; margin: 14px auto 0; color: #b7b0a2; font-size: 14px; line-height: 1.8; }
.contact-ways {
  margin: 28px auto 0;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px 12px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
}
.contact-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: #8d867a;
  flex: none;
}
.contact-value {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 0.04em;
  color: #f3f0e9;
}
.contact-copy {
  flex: none; min-height: 36px;
  padding: 0 15px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  color: #f3f0e9;
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: 0.2s var(--ease);
}
.contact-copy:hover {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}
.contact-copy.copied {
  background: rgba(111, 191, 106, 0.2);
  border-color: rgba(111, 191, 106, 0.55);
  color: #9be08f;
}
.contact-tip {
  font-size: 13px; min-height: 20px;
  color: #8d867a;
  letter-spacing: 0.06em;
}
.contact .plinks {
  margin: 34px auto 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 10px;
  max-width: 760px;
}
.contact .plinks a {
  font-size: 12px; color: #b7b0a2; border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 7px 14px; border-radius: 999px; transition: 0.25s;
}
.contact .plinks a:hover { color: #fff; border-color: rgba(255, 255, 255, 0.4); }
.contact footer {
  margin-top: clamp(36px, 7vh, 64px); padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 12px; color: #7d776b; line-height: 2;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .dots { display: none; }
  .biz-grid { grid-template-columns: 1fr; }
  .solution-index { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .product .inner { grid-template-columns: 1fr; gap: 34px; }
  .product.flip .col-text { order: 1; }
  .product.flip .col-media { order: 2; }
  .wm { font-size: clamp(110px, 20vw, 170px); top: 66px; }
  .col-text h3 { font-size: clamp(32px, 5.4vw, 44px); }
  .p-desc { max-width: none; }
  .comp-dm .browser { width: 92%; }
  .comp-dm .phone { right: 0; bottom: -12%; width: clamp(120px, 26%, 170px); }
  .comp-dd .browser.sub { left: 0; }
  .hero .inner { grid-template-columns: 1fr; gap: 40px; }
  .hero .brand { order: -1; }
  .hero .brand img { width: clamp(140px, 30vw, 200px); }
  .hero .vertical { display: none; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  html { scroll-snap-type: y proximity; }
  .topbar { height: 56px; }
  .topbar .co { font-size: 13px; }
  .topbar .co small { display: none; }
  .topbar nav a:not(.cta) { display: none; }
  .topbar nav a[href="#solutions"] {
    display: inline-flex; align-items: center; min-height: 40px; font-size: 13px;
  }
  .inner { width: 92vw; padding: 72px 0 40px; }
  .screen { scroll-snap-align: none; min-height: 0; }
  .hero.screen, .biz.screen, .contact.screen { min-height: 100svh; scroll-snap-align: start; }
  .hero .inner { display: block; padding: 80px 0 48px; }
  .hero .brand { display: none; }
  .hero h1 { font-size: clamp(45px, 13vw, 58px); }
  .hero .sub { margin-top: 16px; font-size: 15px; line-height: 1.8; }
  .hero .actions { margin-top: 26px; gap: 10px; }
  .hero .actions .btn { min-height: 46px; padding: 12px 20px; font-size: 13.5px; }
  .hero .scroll-hint { margin-top: 30px; font-size: 10px; }
  .biz-grid { grid-template-columns: 1fr; }
  .solution-index { grid-template-columns: 1fr 1fr; }
  .js .logistics-tabs { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .vehicle-media-note { margin-top: 22px; }
  .solution-index a { min-height: 76px; padding: 13px; }
  .solution-index span { font-size: 16px; }
  .wm { font-size: 96px; top: 60px; opacity: 0.4; }
  .col-text h3 { font-size: 30px; }
  .p-tag { font-size: 15.5px; }
  .p-desc { font-size: 14px; }
  .comp-dm .browser { width: 100%; }
  .comp-dm .phone { position: relative; right: auto; bottom: auto; width: 46%; margin: -14% 4% 0 auto; }
  .comp-dd .browser.sub { position: relative; left: auto; bottom: auto; width: 72%; margin: -10% 0 0 4%; }
  .comp-d-dd .pair { grid-template-columns: 1fr; }
  .comp-d-dm .row {
    flex-wrap: wrap;
  }
  .comp-d-dm .row .browser {
    flex: 1 1 100%;
  }
  .comp-d-dm .row .phone {
    width: 42%;
    margin: -10% 4% 0 auto;
  }
  .comp-mmm .phone .scr, .comp-mm .phone .scr { aspect-ratio: 390 / 720; }
  .comp-mmd { flex-wrap: wrap; }
  .comp-mmd .shot { width: 44%; }
  .comp-mmd .browser { position: relative; width: 88%; margin: -8% auto 0; }
  .value b { font-size: 20px; }
  .p-actions { margin-top: 22px; }
  .p-actions .btn { min-height: 44px; padding: 11px 20px; }
  .contact .inner { padding-top: 76px; }
  .contact-lead { font-size: 13px; max-width: 31em; }
  .contact-item { gap: 9px; padding: 10px 12px; }
  .contact-value { font-size: 16px; }
}

/* ---------- 产品图灯箱 ---------- */
.col-media img {
  cursor: zoom-in;
}
.browser img,
.phone .scr img,
.shot img {
  transition: opacity 0.2s var(--ease), filter 0.2s var(--ease);
}
.browser:hover img,
.phone:hover .scr img,
.shot:hover img {
  filter: brightness(0.97);
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  background: rgba(12, 10, 8, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.28s var(--ease), visibility 0.28s;
}
.lightbox.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.lightbox .lb-stage {
  position: relative;
  max-width: min(96vw, 1480px);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  transform: scale(0.96) translateY(8px);
  transition: transform 0.28s var(--ease);
}
.lightbox.open .lb-stage {
  transform: none;
}
.lightbox .lb-img-wrap {
  max-width: 100%;
  max-height: calc(88vh - 40px);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  background: #0d0c0b;
  line-height: 0;
}
.lightbox .lb-img-wrap img {
  display: block;
  max-width: 96vw;
  max-height: calc(88vh - 40px);
  width: auto;
  height: auto;
  object-fit: contain;
  cursor: default;
}
.lightbox .lb-cap {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(243, 240, 233, 0.72);
  text-align: center;
  max-width: 90vw;
}
.lightbox .lb-btn {
  position: absolute;
  z-index: 2;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  color: #f3f0e9;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: 0.2s var(--ease);
  backdrop-filter: blur(6px);
}
.lightbox .lb-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.35);
}
.lightbox .lb-btn svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.lightbox .lb-prev { left: max(12px, env(safe-area-inset-left)); }
.lightbox .lb-next { right: max(12px, env(safe-area-inset-right)); }
.lightbox .lb-close {
  top: max(16px, env(safe-area-inset-top));
  right: max(16px, env(safe-area-inset-right));
  transform: none;
}
.lightbox .lb-count {
  position: absolute;
  top: max(22px, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: rgba(243, 240, 233, 0.55);
}
html.lb-open,
html.lb-open body {
  overflow: hidden !important;
}

@media (max-width: 720px) {
  .lightbox .lb-btn {
    width: 40px;
    height: 40px;
  }
  .lightbox .lb-prev { left: 6px; }
  .lightbox .lb-next { right: 6px; }
  .lightbox .lb-img-wrap img {
    max-height: calc(82vh - 36px);
  }
}