/* 拾文 xmmsp.cn — 墨 × 白 × 蓝 × 金 四色体系
   阴影语言：大区块外容器单组阴影、全页参数不重复、FAQ 朝下 */

:root {
  --ink: #131722;
  --ink-2: #232a3a;
  --ink-3: #3d4356;
  --paper: #ffffff;
  --mist: #f4f7fd;
  --line: #e3e9f4;
  --blue: #0a45c0;
  --blue-deep: #072f8a;
  --blue-tint: #e8eefb;
  --gold: #e9a63c;
  --gold-deep: #b97a14;
  --gold-tint: #fdf4e3;
  --shadow-ink: rgba(19, 23, 34, .16);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font: 16px/1.75 "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }

.wrap { width: min(1160px, 92%); margin: 0 auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 26px; border-radius: 10px;
  font-weight: 700; font-size: 15.5px; line-height: 1.4;
  border: 2px solid transparent; cursor: pointer;
  transition: transform .18s ease, background .18s ease;
}
.btn-pri { background: var(--blue); color: #fff; }
.btn-pri:hover { background: var(--blue-deep); transform: translateY(-2px); }
.btn-line { border-color: var(--blue); color: var(--blue); background: transparent; }
.btn-line:hover { background: var(--blue-tint); }
.btn-gold {
  background: var(--gold); color: var(--ink);
  box-shadow: 0 3px 0 var(--gold-deep);
}
.btn-gold:hover { transform: translateY(-2px); background: #f2b34e; }
.btn-lg { padding: 15px 38px; font-size: 17px; border-radius: 12px; }

/* ---------- 顶栏 ---------- */
.hd {
  position: sticky; top: 0; z-index: 900;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.hd-in { display: flex; align-items: center; gap: 26px; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand img { border-radius: 9px; box-shadow: 0 2px 5px var(--shadow-ink); }
.brand-t { display: flex; flex-direction: column; line-height: 1.25; }
.brand-t strong { font-size: 19px; letter-spacing: 1px; }
.brand-t small { font-size: 11.5px; color: var(--ink-3); letter-spacing: .4px; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a { padding: 8px 13px; border-radius: 8px; font-size: 14.5px; color: var(--ink-3); }
.nav a:hover { color: var(--blue); background: var(--blue-tint); }
.nav a.on { color: var(--blue); font-weight: 700; position: relative; }
.nav a.on::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 2px;
  height: 3px; border-radius: 2px; background: var(--gold);
}
.hd-r { display: flex; align-items: center; gap: 12px; }
.hd-cta { box-shadow: 0 2px 4px var(--shadow-ink); padding: 9px 20px; font-size: 14.5px; }
.burger {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line);
  border-radius: 10px; background: #fff; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.burger span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }

/* ---------- 英雄区 ---------- */
.hero { background: linear-gradient(180deg, var(--mist) 0%, #fff 100%); overflow: hidden; }
.hero-in {
  display: flex; align-items: center; gap: 40px;
  padding: 64px 0 70px;
}
.hero-l { flex: 1.06; min-width: 0; }
.kick {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 12.5px; letter-spacing: 2.5px; font-weight: 700;
  color: var(--blue-deep); text-transform: uppercase;
}
.kick i {
  font-style: normal; width: 26px; height: 26px; border-radius: 7px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--blue); color: #fff; font-size: 14px; letter-spacing: 0;
}
h1 { font-size: clamp(46px, 6vw, 66px); font-weight: 900; letter-spacing: 4px; margin: 14px 0 6px; }
.lead { color: var(--ink-3); font-size: 16.5px; margin: 14px 0 26px; max-width: 560px; }
.hero-acts { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-points { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 24px; }
.hero-points li {
  font-size: 13.5px; font-weight: 700; color: var(--blue-deep);
  background: #fff; border: 1px solid var(--line); border-bottom: 3px solid var(--gold);
  padding: 7px 14px; border-radius: 9px;
}

/* 英雄右视觉 ⑤双色块拼贴：对角双大色块，截图骑缝压交线 */
.hero-r { flex: .94; }
.collage { position: relative; min-height: 590px; }
.cg-block { position: absolute; border-radius: 16px; }
.cg-blue {
  left: 0; top: 0; width: 76%; height: 62%;
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 14px),
    var(--blue);
}
.cg-gold {
  right: 0; bottom: 0; width: 72%; height: 58%;
  background:
    repeating-linear-gradient(45deg, rgba(255,255,255,.09) 0 2px, transparent 2px 16px),
    var(--gold);
}
.cg-shot {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 56%; margin: 0;
  border: 7px solid #fff; border-radius: 20px;
  background: #fff;
  box-shadow: 22px 26px 0 rgba(7, 47, 138, .08);
}
.cg-shot img { display: block; width: 100%; height: auto; border-radius: 13px; }
.cg-tag {
  position: absolute; background: #fff; border-radius: 12px;
  padding: 10px 16px 11px; line-height: 1.4;
  border: 1px solid var(--line);
}
.cg-tag b { display: block; font-size: 15px; }
.cg-tag span { font-size: 12px; color: var(--ink-3); }
.cg-tag-a { left: -6px; top: 11%; border-left: 5px solid var(--blue); }
.cg-tag-b { right: -4px; bottom: 13%; border-left: 5px solid var(--gold-deep); }
.cg-ver {
  position: absolute; top: 20px; right: 12px;
  background: var(--ink); color: var(--gold);
  font-size: 12px; font-weight: 700; letter-spacing: 1px;
  padding: 6px 13px; border-radius: 999px;
}
.cg-stamp {
  position: absolute; left: 4%; bottom: 6%;
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff; border-radius: 999px; padding: 5px 12px 5px 6px;
  border: 1px solid var(--line);
}
.cg-stamp img { width: 30px; height: 30px; border-radius: 50%; }
.cg-stamp i {
  font-style: normal; font-size: 12px; font-weight: 800; color: var(--gold-deep);
}

/* ---------- 通用区块 ---------- */
.sec { padding: 78px 0; }
.sec-alt { background: var(--mist); }
.sec-ink { background: var(--ink); color: #fff; }
.sec-h { max-width: 720px; margin-bottom: 42px; }
.sec-h h2 { font-size: clamp(26px, 3vw, 34px); font-weight: 900; letter-spacing: 1px; margin: 10px 0 8px; }
.sec-sub { color: var(--ink-3); font-size: 15px; }
.sec-h-light .sec-sub, .sec-ink .sec-sub { color: #aeb6c9; }
.sec-ink h2 { color: #fff; }
.sec-ink .kick { color: var(--gold); }

/* ---------- 界面胶片横条 ---------- */
.film {
  display: flex; gap: 20px;
  overflow-x: auto; scroll-snap-type: x mandatory;
  padding: 30px 6px 40px;
  border-radius: 18px;
  box-shadow: -16px 20px 0 rgba(233, 166, 60, .14);
  background: #fff;
  border: 1px solid var(--line);
}
.film::-webkit-scrollbar { height: 8px; }
.film::-webkit-scrollbar-thumb { background: var(--blue-tint); border-radius: 4px; }
.fl {
  flex: 0 0 264px; scroll-snap-align: start;
  position: relative; margin: 0;
  background: var(--paper); border: 1px solid var(--line); border-radius: 14px;
  overflow: hidden;
}
.fl img { display: block; width: 100%; height: auto; }
.fl figcaption {
  padding: 10px 14px 12px; font-size: 12.5px; color: var(--ink-3);
  border-top: 1px dashed var(--line);
}
.fl-no {
  position: absolute; top: 10px; left: 10px; z-index: 2;
  background: var(--ink); color: var(--gold);
  font-size: 11.5px; font-weight: 800; letter-spacing: 1px;
  padding: 3px 9px; border-radius: 7px;
}
.fl-2, .fl-4, .fl-6 { border-top: 4px solid var(--gold); }
.fl-1, .fl-3, .fl-5 { border-top: 4px solid var(--blue); }

/* ---------- 痛点对照 ---------- */
.vs { display: grid; grid-template-columns: 1fr 108px 1fr; gap: 0; align-items: start; }
.vs-col { border-radius: 16px; padding: 26px 28px 30px; }
.vs-old {
  background: var(--ink-2);
  border-left: 6px solid var(--ink-3);
}
.vs-old h3 { color: var(--gold); font-size: 19px; margin-bottom: 14px; }
.vs-new {
  background: #fff; color: var(--ink);
  border-left: 6px solid var(--blue);
  border-top: 4px solid var(--gold);
  margin-top: 30px;
}
.vs-new h3 { color: var(--blue); font-size: 19px; margin-bottom: 14px; }
.vs-col ol { display: grid; gap: 14px; }
.vs-col li { padding: 13px 16px; border-radius: 11px; background: rgba(255, 255, 255, .06); }
.vs-new li { background: var(--mist); border: 1px solid var(--line); }
.vs-col b { display: block; font-size: 15.5px; }
.vs-old li b { color: #fff; }
.vs-col p { font-size: 13.5px; margin-top: 3px; }
.vs-old li p { color: #aeb6c9; }
.vs-new li p { color: var(--ink-3); }
.vs-mid { align-self: center; justify-self: center; }
.vs-mid span {
  display: inline-flex; align-items: center; justify-content: center;
  width: 84px; height: 84px; border-radius: 50%;
  background: var(--gold); color: var(--ink);
  font-weight: 900; font-size: 14px; text-align: center; line-height: 1.3;
  border: 3px solid #fff; outline: 2px solid var(--gold-deep);
}

/* ---------- 版本横条 ---------- */
.verbar { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.ver-in { display: flex; flex-wrap: wrap; gap: 12px 14px; padding: 22px 0; }
.ver-chip {
  display: inline-flex; align-items: center; gap: 9px;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px; font-size: 13px; color: var(--ink-3);
  background: var(--mist);
}
.ver-chip b { color: var(--blue); font-size: 14px; }
.ver-chip:nth-child(even) b { color: var(--gold-deep); }

/* ---------- 功能 1+4 拼贴 ---------- */
.bn { display: grid; grid-template-columns: 1.16fr 1fr 1fr; gap: 20px; }
.bn-big {
  grid-row: span 2; position: relative;
  background: #fff; border: 1px solid var(--line);
  border-left: 7px solid var(--blue);
  border-radius: 16px; padding: 30px 30px 26px;
  box-shadow: 12px 14px 0 var(--blue);
}
.bn-big h3 { font-size: 22px; margin: 8px 0 10px; }
.bn-big p { color: var(--ink-3); font-size: 15px; }
.bn-mini {
  display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-top: 22px; padding: 12px 18px;
  background: var(--mist); border: 1px dashed var(--blue); border-radius: 12px;
  font-size: 13px; color: var(--ink-3);
}
.bn-mini b { color: var(--blue); font-size: 14px; }
.bn-mini i { font-style: normal; color: var(--gold-deep); font-weight: 900; }
.bn-side {
  position: absolute; top: 30px; right: 24px;
  writing-mode: vertical-rl; letter-spacing: 3px;
  font-size: 11px; font-weight: 800; color: var(--gold-deep);
}
.bn-no {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 34px; height: 24px; padding: 0 8px;
  background: var(--gold); color: var(--ink);
  font-weight: 900; font-size: 12.5px; border-radius: 7px;
}
.bn-s {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  padding: 22px 22px 20px;
}
.bn-s h3 { font-size: 17px; margin: 9px 0 6px; }
.bn-s p { font-size: 13.5px; color: var(--ink-3); }
.bn-2, .bn-4 { background: var(--gold-tint); border-color: #f0dfb8; }
.bn-1, .bn-3 { border-top: 4px solid var(--blue); }
.bn-2, .bn-4 { border-top: 4px solid var(--gold); }
.bn-s:nth-child(odd) { transform: translateY(12px); }

/* ---------- FAQ 手风琴 ---------- */
.acc { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
.acc-item {
  background: #fff; border: 1px solid var(--line); border-radius: 13px;
  overflow: hidden;
  transition: box-shadow .25s ease;
}
.acc-item.on {
  border-color: var(--blue-tint);
  box-shadow: 10px 10px 0 rgba(10, 69, 192, .12), -10px 10px 0 rgba(233, 166, 60, .18);
}
.acc-head {
  width: 100%; display: flex; align-items: center; gap: 14px;
  background: none; border: 0; cursor: pointer;
  padding: 17px 20px; text-align: left;
  font: 700 16px/1.5 "Microsoft YaHei", "PingFang SC", sans-serif; color: var(--ink);
}
.acc-no {
  flex: none; width: 34px; height: 26px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--blue); color: #fff; font-size: 12.5px; font-weight: 800;
  border-radius: 7px;
}
.acc-item:nth-child(even) .acc-no { background: var(--gold); color: var(--ink); }
.acc-q { flex: 1; }
.acc-head i { position: relative; flex: none; width: 16px; height: 16px; }
.acc-head i::before, .acc-head i::after {
  content: ""; position: absolute; background: var(--blue);
  border-radius: 2px; transition: transform .25s ease;
}
.acc-head i::before { left: 0; right: 0; top: 7px; height: 2px; }
.acc-head i::after { top: 0; bottom: 0; left: 7px; width: 2px; }
.acc-item.on .acc-head i::after { transform: scaleY(0); }
.acc-item.on .acc-no { background: var(--blue-deep); }
.acc-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .3s ease; }
.acc-body p {
  min-height: 0; overflow: hidden;
  padding: 0 20px; color: var(--ink-3); font-size: 14.5px;
}
.acc-item.on .acc-body { grid-template-rows: 1fr; }
.acc-item.on .acc-body p { padding-bottom: 20px; }

/* ---------- 留言时间线 ---------- */
.tl { position: relative; max-width: 860px; margin: 0 auto; padding-left: 36px; }
.tl::before {
  content: ""; position: absolute; left: 9px; top: 10px; bottom: 10px;
  width: 2px; background: var(--line);
}
.tl-item { position: relative; padding-bottom: 18px; }
.tl-dot {
  position: absolute; left: -34px; top: 22px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 4px solid var(--blue);
}
.tl-item:nth-child(even) .tl-dot { border-color: var(--gold); }
.tl-card {
  background: #fff; border: 1px solid var(--line); border-radius: 13px;
  padding: 16px 20px 15px;
}
.tl-item:nth-child(odd) .tl-card { border-top: 4px solid var(--blue); }
.tl-item:nth-child(even) .tl-card { border-top: 4px solid var(--gold); }
.tl-card header {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; margin-bottom: 7px;
}
.tl-card b { font-size: 15px; }
.tl-card time { font-size: 12.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.tl-card p { font-size: 14.5px; color: var(--ink-3); }

/* ---------- 底部下载横幅 ---------- */
.dlband {
  background: var(--ink);
  border-top: 5px solid var(--gold);
  padding: 34px 0;
  box-shadow: 0 18px 34px rgba(19, 23, 34, .35);
}
.dl-in { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.dl-l { display: flex; align-items: center; gap: 16px; }
.dl-l img { border-radius: 12px; }
.dl-l b { display: block; color: #fff; font-size: 19px; letter-spacing: 1px; }
.dl-l span { color: #aeb6c9; font-size: 13.5px; }
.dl-r { text-align: center; }
.dl-r p { margin-top: 9px; font-size: 12.5px; color: #8b93a7; }

/* ---------- 页脚 ---------- */
.ft { background: var(--mist); border-top: 3px solid var(--blue); padding: 30px 0 22px; }
.ft-in { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.ft-links { display: flex; gap: 18px; }
.ft-links a { font-size: 13.5px; color: var(--ink-3); }
.ft-links a:hover { color: var(--blue); }
.ft-icp { text-align: center; margin-top: 16px; }
.ft-icp a { font-size: 12.5px; color: var(--ink-3); }
.ft-c { text-align: center; font-size: 12.5px; color: var(--ink-3); margin-top: 6px; }

/* ---------- 返回顶部 ---------- */
.backtop {
  position: fixed; right: 24px; bottom: 40px; z-index: 99980;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--blue); color: #fff;
  font-size: 20px; font-weight: 900; border: 0; cursor: pointer;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .25s ease, transform .25s ease;
  box-shadow: 0 8px 18px rgba(10, 69, 192, .30);
}
.backtop.on { opacity: 1; visibility: visible; transform: none; }

/* ---------- 入场动画 ---------- */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rv { opacity: 1; transform: none; transition: none; }
  .btn, .acc-head i::before, .acc-head i::after, .acc-body { transition: none; }
}

/* ---------- 移动端 ---------- */
@media (max-width: 960px) {
  .bn { grid-template-columns: 1fr 1fr; }
  .bn-big { grid-column: 1 / -1; grid-row: auto; }
  .bn-s:nth-child(odd) { transform: none; }
  .vs { grid-template-columns: 1fr; gap: 16px; }
  .vs-mid { order: 2; }
  .vs-new { order: 3; margin-top: 0; }
  .vs-mid span { width: auto; height: auto; padding: 8px 18px; border-radius: 999px; }
  .collage { min-height: 520px; }
}

@media (max-width: 768px) {
  .hd-in { height: 62px; gap: 12px; }
  .nav {
    position: absolute; top: 62px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 10px 16px; gap: 2px;
    display: none;
    box-shadow: 0 14px 22px rgba(19, 23, 34, .10);
  }
  .nav.open { display: flex; }
  .nav a { padding: 11px 12px; font-size: 15px; }
  .burger { display: inline-flex; }
  .hd-cta { padding: 8px 14px; font-size: 13.5px; }

  /* 手机端英雄区：文案在上、画面在下 */
  .hero-in { flex-direction: column; align-items: stretch; gap: 30px; padding: 40px 0 46px; }
  h1 { letter-spacing: 2px; }
  .lead { font-size: 15px; }
  .collage { min-height: 440px; }
  .cg-shot { width: 60%; }
  .cg-tag { padding: 8px 12px 9px; }
  .cg-tag b { font-size: 13.5px; }
  .cg-tag span { font-size: 11px; }
  .cg-ver { top: 12px; right: 8px; font-size: 11px; }

  .sec { padding: 56px 0; }
  .sec-h { margin-bottom: 30px; }

  /* 界面区：一排横滑 */
  .film { gap: 14px; padding: 22px 12px 28px; border-radius: 14px; }
  .fl { flex-basis: 208px; }
  .fl-2, .fl-4, .fl-6 { transform: none; }

  .vs-col { padding: 20px 18px 24px; }
  .ver-in { padding: 16px 0; gap: 8px 10px; }
  .ver-chip { padding: 6px 12px; font-size: 12px; }

  .bn { grid-template-columns: 1fr; gap: 14px; }
  .bn-big { padding: 24px 20px; }
  .bn-side { display: none; }
  .bn-big { box-shadow: 8px 10px 0 var(--blue); }

  .acc-head { padding: 14px 16px; font-size: 15px; gap: 10px; }
  .acc-body p { padding: 0 16px; font-size: 14px; }
  .acc-item.on .acc-body p { padding-bottom: 16px; }
  .acc-item.on { box-shadow: 7px 8px 0 rgba(10, 69, 192, .12), -7px 8px 0 rgba(233, 166, 60, .18); }

  .tl { padding-left: 26px; }
  .tl::before { left: 5px; }
  .tl-dot { left: -27px; width: 13px; height: 13px; border-width: 3px; }
  .tl-card { padding: 13px 15px 13px; }
  .tl-card header { flex-wrap: wrap; gap: 4px 12px; }

  .dl-in { flex-direction: column; text-align: center; }
  .dl-l { flex-direction: column; text-align: center; }
  .dl-r { width: 100%; }
  .btn-lg { width: 100%; }
  .backtop { right: 16px; bottom: 30px; width: 42px; height: 42px; }
}