/* ==========================================================================
   水宝蓝 SHUIBAOLAN — 品牌官网设计系统
   无锡泓泉润生科技有限公司
   基于《水宝蓝 · 纯文字 Logo 方案》A 方案（稳重商务）色彩与版式规范
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  /* 品牌色（取自官方字标实际色值） */
  --brand-700: #0D3B66;   /* 深墨蓝：标题 / 深色底 */
  --brand-600: #243C9C;   /* 字标主色：主色 */
  --brand-500: #1565C0;   /* 中蓝：链接 / 辅助 */
  --brand-400: #4FC3F7;   /* 亮青：点缀 / 高亮 */
  --brand-100: #E8F2FC;   /* 淡蓝底 */
  --brand-50:  #F5F9FE;   /* 极淡蓝底 */

  /* 中性色 */
  --ink:       #17202E;
  --ink-2:     #3A4757;
  --gray:      #64748B;
  --gray-2:    #94A3B8;
  --line:      #DCE8F4;
  --line-soft: #EDF3FA;
  --white:     #FFFFFF;

  /* 语义色 */
  --ok:        #1E7A46;
  --ok-bg:     #E9F7EF;
  --warn:      #B26A00;
  --warn-bg:   #FFF6E5;

  /* 尺寸 */
  --radius:    14px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(13,59,102,.06), 0 2px 8px rgba(13,59,102,.05);
  --shadow:    0 4px 14px rgba(13,59,102,.07), 0 12px 34px rgba(13,59,102,.07);
  --shadow-lg: 0 18px 48px rgba(13,59,102,.16);
  --maxw:      1180px;
  --ease:      cubic-bezier(.22,.61,.36,1);

  --font-cn: "PingFang SC","Source Han Sans SC","Noto Sans SC","Hiragino Sans GB",
             "Microsoft YaHei","WenQuanYi Micro Hei",system-ui,-apple-system,"Segoe UI",sans-serif;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--brand-500); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--brand-600); }
h1, h2, h3, h4, h5 { margin: 0; line-height: 1.28; color: var(--brand-700); font-weight: 800; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; }
table { border-collapse: collapse; width: 100%; }

/* 焦点可见性（无障碍） */
:focus-visible {
  outline: 3px solid var(--brand-400);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 跳转到主内容（无障碍） */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--brand-600); color: #fff; padding: 10px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* 仅供屏幕阅读器（视觉隐藏但可被读屏与搜索引擎读取） */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

/* ---------- 布局工具 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container-narrow { width: 100%; max-width: 880px; margin: 0 auto; padding: 0 24px; }
.section { padding: 84px 0; }
.section-sm { padding: 56px 0; }
.bg-soft { background: var(--brand-50); }
.bg-pale { background: var(--brand-100); }
.bg-deep { background: var(--brand-700); color: #fff; }
.bg-deep h1, .bg-deep h2, .bg-deep h3 { color: #fff; }
.bg-deep p { color: rgba(255,255,255,.82); }

.grid { display: grid; gap: 22px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
/* 网格/弹性子项默认 min-width:auto，会被内部可滚动内容（如 min-width 较宽的数据表）
   撑破容器。统一置 0，让子项可收缩、由内部滚动容器负责横向滚动。
   （轨道侧另有 minmax(0,1fr) 兜底，两者互为保险。） */
.split > *, .grid > *, .steps > *, .pledge > *, .calc > *, .app-screens > *, .conv-table > * { min-width: 0; }
.split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 56px; align-items: center; }
.split.rev .media { order: -1; }
.mt-0 { margin-top: 0; } .mt-s { margin-top: 12px; } .mt-m { margin-top: 24px; } .mt-l { margin-top: 40px; }
.center { text-align: center; }
.muted { color: var(--gray); }
.small { font-size: 13.5px; }
.lead { font-size: 18px; line-height: 1.8; color: var(--ink-2); }

/* ---------- 标题体系 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .14em;
  color: var(--brand-500); text-transform: uppercase; margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--brand-400); border-radius: 2px; }
.bg-deep .eyebrow { color: var(--brand-400); }

.h-display { font-size: clamp(30px, 4.4vw, 50px); line-height: 1.18; letter-spacing: -.02em; }
.h-section { font-size: clamp(25px, 3vw, 36px); letter-spacing: -.015em; }
.h-card { font-size: 19px; }
.sub { margin-top: 16px; font-size: 17px; color: var(--gray); line-height: 1.8; }
.rule { width: 56px; height: 3px; background: var(--brand-400); border-radius: 3px; margin: 20px 0 0; }
.center .rule { margin-left: auto; margin-right: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 14px 30px; border-radius: 999px; border: 1.5px solid transparent;
  font-size: 15.5px; font-weight: 700; font-family: inherit; cursor: pointer;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease), color .22s var(--ease);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(135deg, var(--brand-600), var(--brand-500)); color: #fff; box-shadow: 0 8px 22px rgba(36,60,156,.28); }
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 14px 30px rgba(36,60,156,.34); }
.btn-ghost { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.42); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.2); color: #fff; }
.btn-outline { background: #fff; border-color: var(--line); color: var(--brand-600); }
.btn-outline:hover { border-color: var(--brand-500); color: var(--brand-600); box-shadow: var(--shadow-sm); }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
  transition: box-shadow .3s var(--ease);
}
.site-header.is-scrolled { box-shadow: 0 4px 22px rgba(13,59,102,.08); }
.header-inner { display: flex; align-items: center; gap: 28px; height: 74px; }
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand img { height: 40px; width: auto; }
.brand .brand-alt { display: none; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a {
  position: relative; padding: 9px 14px; border-radius: 8px;
  font-size: 15px; font-weight: 600; color: var(--ink-2);
}
.nav a:hover { color: var(--brand-600); background: var(--brand-50); }
.nav a.active { color: var(--brand-600); }
.nav a.active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px;
  height: 2px; background: var(--brand-500); border-radius: 2px;
}
.header-cta { margin-left: 10px; }
/* 移动端专用 CTA：桌面端隐藏（桌面用 .header-cta），≤860px 收进下拉菜单，
   避免小屏页眉放不下而把主转化入口整个丢掉。 */
.nav-cta { display: none; }
.nav-toggle {
  display: none; width: 44px; height: 44px; margin-left: auto;
  border: 1px solid var(--line); background: #fff; border-radius: 10px;
  cursor: pointer; padding: 0; align-items: center; justify-content: center;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--brand-600); border-radius: 2px; position: relative; }
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 20px; height: 2px; background: var(--brand-600); border-radius: 2px;
  transition: transform .25s var(--ease), top .25s var(--ease);
}
.nav-toggle span::before { top: -6px; } .nav-toggle span::after { top: 6px; }
.nav-open .nav-toggle span { background: transparent; }
.nav-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
.nav-open .nav-toggle span::after { top: 0; transform: rotate(-45deg); }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(150deg, #0A2E4F 0%, #143C74 42%, #1565C0 100%);
  color: #fff; padding: 96px 0 108px;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 82% 18%, rgba(79,195,247,.30), transparent 46%),
    radial-gradient(circle at 12% 88%, rgba(36,60,156,.55), transparent 52%);
  pointer-events: none;
}
.hero-inner { position: relative; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr); gap: 56px; align-items: center; }
.hero h1 { color: #fff; }
.hero .lead { color: rgba(255,255,255,.86); max-width: 30em; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px; padding: 7px 16px;
  background: rgba(79,195,247,.16); border: 1px solid rgba(79,195,247,.42);
  border-radius: 999px; font-size: 13px; font-weight: 700; color: #B9E6FF; margin-bottom: 22px;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: #4FC3F7; box-shadow: 0 0 0 4px rgba(79,195,247,.24); }
.hero-facts { display: flex; flex-wrap: wrap; gap: 34px; margin-top: 38px; }
.hero-fact strong { display: block; font-size: 27px; font-weight: 800; color: #fff; line-height: 1.2; letter-spacing: -.01em; }
.hero-fact span { font-size: 13.5px; color: rgba(255,255,255,.72); }
.hero-visual { position: relative; }

/* Hero 促销条 */
.promo-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.promo-strip span {
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.24);
  padding: 7px 15px; border-radius: 999px; font-size: 13.5px; font-weight: 600; color: #fff;
}

/* ---------- 卡片 ---------- */
.card {
  background: #fff; border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 28px 26px; box-shadow: var(--shadow-sm);
  transition: transform .26s var(--ease), box-shadow .26s var(--ease), border-color .26s var(--ease);
  height: 100%;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--line); }
.card h3 { font-size: 18.5px; margin-bottom: 10px; }
.card p { color: var(--gray); font-size: 14.6px; margin-bottom: 0; line-height: 1.78; }
.card .ico {
  width: 48px; height: 48px; border-radius: 13px; margin-bottom: 18px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(140deg, var(--brand-100), #fff);
  border: 1px solid var(--line);
}
.card .ico svg { width: 24px; height: 24px; }

/* 强调卡片 */
.card-feature {
  background: linear-gradient(160deg, #fff, var(--brand-50));
  border-color: var(--line);
}
.card-deep { background: var(--brand-700); border-color: var(--brand-700); color: #fff; }
.card-deep h3 { color: #fff; }
.card-deep p { color: rgba(255,255,255,.78); }
.card-deep .ico { background: rgba(79,195,247,.16); border-color: rgba(79,195,247,.3); }

/* 数字序号卡 */
.card-num { position: relative; padding-top: 26px; }
.card-num .num {
  font-size: 13px; font-weight: 800; letter-spacing: .12em; color: var(--brand-400);
  display: block; margin-bottom: 10px;
}

/* ---------- 服务承诺四条 ---------- */
.pledge {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px;
}
.pledge-item {
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius); padding: 26px 22px; text-align: center;
  transition: background .26s var(--ease), transform .26s var(--ease);
}
.pledge-item:hover { background: rgba(255,255,255,.15); transform: translateY(-3px); }
.pledge-item .big { font-size: 20px; font-weight: 800; color: #fff; letter-spacing: .02em; }
.pledge-item .sub2 { font-size: 13.4px; color: rgba(255,255,255,.76); margin-top: 8px; line-height: 1.7; }
.pledge-item svg { width: 30px; height: 30px; margin: 0 auto 14px; }

/* ---------- 表格 ---------- */
.table-wrap {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow-x: auto; box-shadow: var(--shadow-sm);
}
table.data { min-width: 620px; font-size: 14.6px; }
table.data th, table.data td { padding: 15px 18px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line-soft); }
table.data thead th {
  background: var(--brand-600); color: #fff; font-weight: 700; font-size: 14px;
  letter-spacing: .02em; border-bottom: none; white-space: nowrap;
}
table.data tbody tr:nth-child(even) { background: var(--brand-50); }
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover { background: var(--brand-100); }
table.data td:first-child { font-weight: 600; color: var(--brand-700); }
table.data .hi { color: var(--ok); font-weight: 700; }
table.data .no { color: var(--gray-2); }
.cell-note { display: block; font-size: 12.6px; color: var(--gray); font-weight: 400; margin-top: 3px; }

/* ---------- 步骤流程 ---------- */
.steps { display: grid; gap: 16px; }
.steps.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.steps.c4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.steps.c6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.step {
  background: #fff; border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 24px 20px; position: relative; height: 100%;
}
.step .step-no {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px; margin-bottom: 14px;
  background: linear-gradient(135deg, var(--brand-600), var(--brand-500));
  color: #fff; font-weight: 800; font-size: 14px;
  box-shadow: 0 6px 16px rgba(36,60,156,.24);
}
.step h4 { font-size: 16.5px; margin-bottom: 8px; }
.step p { font-size: 13.8px; color: var(--gray); margin: 0; line-height: 1.72; }
.step-deep { background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.2); }
.step-deep h4 { color: #fff; }
.step-deep p { color: rgba(255,255,255,.76); }

/* ---------- 提示条 ---------- */
.notice {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px; font-size: 14.8px; line-height: 1.8; margin: 26px 0 0;
}
.notice-tip { background: var(--brand-100); border-left: 4px solid var(--brand-500); color: var(--ink-2); }
.notice-ok  { background: var(--ok-bg); border-left: 4px solid var(--ok); color: #14532D; }
.notice-warn{ background: var(--warn-bg); border-left: 4px solid #E0A800; color: #6B4700; }
.notice strong { color: inherit; }
.notice .nt { display: block; font-weight: 800; margin-bottom: 6px; font-size: 15.2px; }

/* ---------- 高亮引言 ---------- */
.quote-band {
  border-radius: var(--radius); padding: 34px 38px;
  background: linear-gradient(150deg, var(--brand-700), #143C74);
  color: #fff; position: relative; overflow: hidden;
}
.quote-band::after {
  content: ""; position: absolute; right: -60px; top: -60px; width: 220px; height: 220px;
  border-radius: 50%; background: rgba(79,195,247,.14);
}
.quote-band .q { font-size: clamp(18px, 2.2vw, 23px); font-weight: 700; line-height: 1.62; position: relative; }
.quote-band .qs { font-size: 14.6px; color: rgba(255,255,255,.76); margin-top: 12px; position: relative; }

/* ---------- App 界面模拟 ---------- */
/* 注意：这里必须用 width:100% + max-width:300px，不能写成 width:300px + max-width:100%。
   百分比 max-width 在固有尺寸计算中按 auto 处理，写成固定 width 会让子项的"最小贡献尺寸"
   变成 300px，进而把 1fr 轨道的最小值也顶到 300px（1fr 实为 minmax(auto,1fr)），
   轨道撑破容器 → 横向溢出。 */
.app-mock {
  width: 100%; max-width: 300px; margin: 0 auto;
  background: #0F2440; border-radius: 34px; padding: 11px;
  box-shadow: var(--shadow-lg); border: 1px solid rgba(255,255,255,.14);
}
.app-screen { background: linear-gradient(170deg, #0D3B66, #1565C0 62%, #2196D9); border-radius: 26px; padding: 22px 18px 26px; color: #fff; overflow: hidden; }
.app-status { display: flex; justify-content: space-between; font-size: 11px; color: rgba(255,255,255,.7); margin-bottom: 16px; letter-spacing: .04em; }
.app-title { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 3px; }
.app-sub { font-size: 11px; color: rgba(255,255,255,.62); margin-bottom: 16px; }
.app-card { background: rgba(255,255,255,.13); border: 1px solid rgba(255,255,255,.2); border-radius: 15px; padding: 15px; margin-bottom: 11px; backdrop-filter: blur(6px); }
.app-card .lbl { font-size: 11px; color: rgba(255,255,255,.68); margin-bottom: 6px; letter-spacing: .02em; }
.app-card .val { font-size: 25px; font-weight: 800; line-height: 1.1; }
.app-card .val small { font-size: 12px; font-weight: 600; opacity: .78; margin-left: 4px; }
.app-card .tag { display: inline-block; font-size: 10.5px; padding: 2px 9px; border-radius: 999px; background: rgba(79,195,247,.28); color: #CBEBFF; margin-left: 8px; font-weight: 700; vertical-align: middle; }
.app-duo { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 11px; }
.app-bar { height: 6px; border-radius: 6px; background: rgba(255,255,255,.2); overflow: hidden; margin-top: 9px; }
.app-bar i { display: block; height: 100%; border-radius: 6px; background: linear-gradient(90deg, #4FC3F7, #7FD8FF); }
.app-tabs { display: flex; justify-content: space-around; margin-top: 16px; padding-top: 13px; border-top: 1px solid rgba(255,255,255,.16); font-size: 10px; color: rgba(255,255,255,.6); }
.app-tabs .on { color: #fff; font-weight: 700; }

/* App 界面细节件 */
.app-chart { display: flex; align-items: flex-end; gap: 7px; height: 74px; margin-top: 12px; }
.app-chart i { flex: 1; border-radius: 4px 4px 0 0; background: linear-gradient(180deg, #7FD8FF, rgba(127,216,255,.28)); display: block; }
.app-chart i.top { background: linear-gradient(180deg, #B9E6FF, #4FC3F7); }
.app-list { display: grid; gap: 10px; margin-top: 12px; }
.app-list .row { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-size: 12px; color: rgba(255,255,255,.86); }
.app-list .row .nm { font-weight: 600; }
.app-list .row .pc { font-weight: 800; color: #fff; font-variant-numeric: tabular-nums; }
.app-list .bar { height: 5px; border-radius: 5px; background: rgba(255,255,255,.2); overflow: hidden; margin-top: 5px; }
.app-list .bar i { display: block; height: 100%; border-radius: 5px; background: linear-gradient(90deg, #4FC3F7, #B9E6FF); }
.app-list .bar.warnBar i { background: linear-gradient(90deg, #FFB86B, #FFD9A8); }
.app-btn { display: block; text-align: center; background: #4FC3F7; color: #0A2E4F; font-weight: 800; font-size: 12.5px; border-radius: 11px; padding: 11px; margin-top: 12px; }
.app-stepper { display: grid; gap: 11px; margin-top: 13px; }
.app-stepper .st { display: flex; gap: 10px; align-items: flex-start; font-size: 11.5px; color: rgba(255,255,255,.7); }
.app-stepper .st .dot2 { width: 9px; height: 9px; border-radius: 50%; background: #4FC3F7; flex-shrink: 0; margin-top: 5px; }
.app-stepper .st.dim .dot2 { background: rgba(255,255,255,.3); }
.app-stepper .st.done .dot2 { background: #7FF0B8; }
.app-stepper .st b { color: #fff; font-weight: 700; display: block; font-size: 12px; }
/* 轨道统一用 minmax(0,1fr)：显式把轨道最小值压到 0，
   不依赖子项 min-width:0，从根上杜绝"子项固有尺寸顶大轨道"的溢出。 */
.app-screens { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 26px; align-items: start; }
@media (max-width: 1024px) { .app-screens { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .app-screens { grid-template-columns: minmax(0, 1fr); } }

/* ---------- 计算器 ---------- */
.calc {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow-sm);
}
.calc-field { margin-bottom: 18px; }
.calc-field:last-child { margin-bottom: 0; }
.calc-field label { display: block; font-size: 14.2px; font-weight: 700; color: var(--brand-700); margin-bottom: 8px; }
.calc-field .hint { display: block; font-weight: 400; color: var(--gray); font-size: 12.6px; margin-top: -4px; margin-bottom: 8px; line-height: 1.6; }
.calc-input {
  display: flex; align-items: stretch; border: 1.5px solid var(--line);
  border-radius: 10px; overflow: hidden; background: #fff;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.calc-input:focus-within { border-color: var(--brand-500); box-shadow: 0 0 0 3px rgba(21,101,192,.13); }
.calc-input input {
  flex: 1; min-width: 0; border: 0; outline: none; background: transparent;
  padding: 13px 15px; font-size: 16.5px; font-family: inherit; color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.calc-input .unit {
  padding: 0 15px; font-size: 14px; color: var(--gray); background: var(--brand-50);
  display: flex; align-items: center; border-left: 1px solid var(--line); white-space: nowrap;
}
.calc-out {
  background: linear-gradient(155deg, var(--brand-700), #143C74);
  border-radius: var(--radius); padding: 28px 26px; color: #fff;
  display: flex; flex-direction: column; justify-content: center;
}
.calc-out .lbl { font-size: 13.2px; color: rgba(255,255,255,.7); }
.calc-out .big { font-size: clamp(30px,4vw,40px); font-weight: 800; line-height: 1.1; letter-spacing: -.02em; margin-top: 2px; }
.calc-out .big small { font-size: 16px; font-weight: 600; opacity: .82; margin-left: 5px; letter-spacing: 0; }
.calc-out .rows { margin-top: 20px; display: grid; gap: 10px; }
.calc-out .rows .r {
  display: flex; justify-content: space-between; gap: 12px; font-size: 14.2px;
  color: rgba(255,255,255,.82); border-top: 1px solid rgba(255,255,255,.15); padding-top: 10px;
}
.calc-out .rows .r b { color: #fff; font-variant-numeric: tabular-nums; }
.calc-out .foot { font-size: 12.4px; color: rgba(255,255,255,.6); margin-top: 16px; line-height: 1.7; }
@media (max-width: 860px) { .calc { grid-template-columns: minmax(0, 1fr); gap: 22px; padding: 24px 20px; } }

/* 桶装水换算小表 */
.conv-table { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.conv-cell {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 16px 12px; text-align: center;
}
.conv-cell .b { font-size: 17px; font-weight: 800; color: var(--brand-600); }
.conv-cell .l { font-size: 12.6px; color: var(--gray); margin-top: 3px; }
@media (max-width: 640px) { .conv-table { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ---------- 设备示意图 ---------- */
.device-stage {
  background: linear-gradient(160deg, var(--brand-50), #fff 60%, var(--brand-100));
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 28px 22px; display: flex; align-items: center; justify-content: center;
  min-height: 292px;
}
/* 关键：图片最大宽度必须回到 100%，否则内联 max-width 会在窄屏撑破容器 */
.device-stage img { max-width: 100%; max-height: 236px; width: auto; height: auto; }
.hero-visual .device-stage { min-height: 330px; }
.hero-visual .device-stage img { max-height: 280px; }
@media (max-width: 560px) {
  .device-stage { min-height: 230px; padding: 20px 16px; }
  .device-stage img { max-height: 190px; }
  .hero-visual .device-stage { min-height: 250px; }
  .hero-visual .device-stage img { max-height: 210px; }
}
.device-caption { text-align: center; font-size: 13.4px; color: var(--gray); margin-top: 16px; }

/* 品牌标志展示 */
.brand-logo { max-width: 100%; max-height: 170px; width: auto; height: auto; }

/* ---------- 对比条（RO 原理） ---------- */
.spec-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.spec-item { text-align: center; padding: 24px 18px; background: #fff; border: 1px solid var(--line-soft); border-radius: var(--radius); }
.spec-item .n { font-size: 26px; font-weight: 800; color: var(--brand-600); letter-spacing: -.01em; }
.spec-item .t { font-size: 13.6px; color: var(--gray); margin-top: 6px; }

/* ---------- FAQ 折叠 ---------- */
.faq { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; display: flex; align-items: flex-start; gap: 16px; text-align: left;
  padding: 22px 4px; background: none; border: 0; cursor: pointer;
  font-family: inherit; font-size: 16.6px; font-weight: 700; color: var(--brand-700);
  line-height: 1.6; transition: color .2s var(--ease);
}
.faq-q:hover { color: var(--brand-500); }
.faq-q .qn {
  flex-shrink: 0; font-size: 13px; font-weight: 800; color: var(--brand-500);
  background: var(--brand-100); border-radius: 7px; padding: 4px 9px; margin-top: 2px;
  letter-spacing: .02em;
}
.faq-q .chev { margin-left: auto; flex-shrink: 0; width: 20px; height: 20px; margin-top: 4px; transition: transform .28s var(--ease); }
.faq-item.open .faq-q .chev { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .34s var(--ease); }
.faq-a-inner { padding: 0 4px 24px 63px; color: var(--ink-2); font-size: 15.2px; line-height: 1.85; }
.faq-a-inner p:last-child { margin-bottom: 0; }

/* ---------- CTA 区块 ---------- */
.cta-band {
  background: linear-gradient(150deg, #0A2E4F, #143C74 55%, #1565C0);
  border-radius: var(--radius-lg); padding: 60px 48px; color: #fff;
  position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; right: -70px; bottom: -90px; width: 300px; height: 300px;
  border-radius: 50%; background: rgba(79,195,247,.16);
}
.cta-band h2 { color: #fff; position: relative; }
.cta-band p { color: rgba(255,255,255,.82); position: relative; }
.cta-inner { position: relative; display: flex; align-items: center; gap: 40px; justify-content: space-between; flex-wrap: wrap; }
.cta-inner .txt { max-width: 620px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0A2135; color: rgba(255,255,255,.7); padding: 62px 0 30px; font-size: 14.4px; }
.footer-top { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr); gap: 38px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.12); }
.site-footer h5 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.site-footer a { color: rgba(255,255,255,.7); display: block; padding: 5px 0; font-size: 14.2px; }
.site-footer a:hover { color: #4FC3F7; }
.footer-brand img { height: 42px; width: auto; margin-bottom: 18px; }
.footer-brand p { color: rgba(255,255,255,.62); font-size: 13.8px; line-height: 1.8; max-width: 30em; }
.footer-bottom { padding-top: 24px; display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; font-size: 13.2px; color: rgba(255,255,255,.52); }
.footer-bottom .disc { max-width: 62em; line-height: 1.8; }
/* 页脚内的行内链接（ICP 备案号必须悬挂并链接至工信部备案系统）。
   .site-footer a 默认是 block，这里覆盖为行内，避免备案号独占一行。 */
.footer-bottom a { display: inline; padding: 0 2px; color: inherit; text-decoration: underline; text-underline-offset: 2px; }
.footer-bottom a:hover { color: #4FC3F7; }

/* ---------- 页面头部（内页） ---------- */
.page-hero {
  background: linear-gradient(150deg, #0A2E4F, #143C74 55%, #1565C0);
  color: #fff; padding: 66px 0 70px; position: relative; overflow: hidden;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 88% 14%, rgba(79,195,247,.26), transparent 44%);
}
.page-hero .container { position: relative; }
.page-hero h1 { color: #fff; }
.page-hero .lead { color: rgba(255,255,255,.84); max-width: 46em; margin-top: 16px; }
.crumbs { font-size: 13.4px; color: rgba(255,255,255,.62); margin-bottom: 18px; }
.crumbs a { color: rgba(255,255,255,.72); }
.crumbs a:hover { color: #4FC3F7; }
.crumbs span { margin: 0 8px; opacity: .5; }

/* ---------- 标签 ---------- */
.pill {
  display: inline-block; padding: 5px 14px; border-radius: 999px;
  font-size: 13px; font-weight: 700; background: var(--brand-100); color: var(--brand-600);
}
.pill-ok { background: var(--ok-bg); color: var(--ok); }
.pill-gray { background: #EEF2F7; color: var(--gray); }
.pill-row { display: flex; flex-wrap: wrap; gap: 9px; }

/* ---------- 清单 ---------- */
.check-list { list-style: none; }
.check-list li { position: relative; padding: 9px 0 9px 32px; font-size: 15.2px; color: var(--ink-2); }
.check-list li::before {
  content: ""; position: absolute; left: 0; top: 15px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--ok-bg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231E7A46' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size: 11px; background-position: center; background-repeat: no-repeat;
}
.dash-list { list-style: none; }
.dash-list li { position: relative; padding: 8px 0 8px 22px; font-size: 15px; color: var(--ink-2); }
.dash-list li::before { content: ""; position: absolute; left: 2px; top: 19px; width: 8px; height: 2px; background: var(--brand-400); border-radius: 2px; }

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .66s var(--ease), transform .66s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps.c6 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero-inner, .split { grid-template-columns: minmax(0, 1fr); gap: 44px; }
  .split.rev .media { order: 0; }
  .footer-top { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 30px; }
  .pledge { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .section { padding: 62px 0; }
  .nav {
    position: fixed; inset: 74px 0 auto 0; flex-direction: column; align-items: stretch;
    background: #fff; border-bottom: 1px solid var(--line); padding: 12px 20px 22px;
    gap: 2px; box-shadow: 0 16px 30px rgba(13,59,102,.12);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: opacity .24s var(--ease), transform .24s var(--ease);
    /* 高度上限 + 内部滚动：8 个导航项在手机横屏（约 390px 高）会超出屏幕，
       无此约束时菜单底部内容会被裁掉且无法滚动到。 */
    max-height: calc(100vh - 74px); overflow-y: auto; overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }
  @supports (height: 100dvh) { .nav { max-height: calc(100dvh - 74px); } }
  .nav-open .nav { opacity: 1; transform: none; pointer-events: auto; }
  .nav a { padding: 13px 14px; font-size: 16px; }
  .nav a.active::after { display: none; }
  .nav a.active { background: var(--brand-50); }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }
  /* 菜单内的主转化入口（选择器需压过 .nav a 的默认文字样式） */
  .nav a.nav-cta {
    display: flex; align-items: center; justify-content: center;
    margin-top: 12px; padding: 14px 24px; border-radius: 999px;
    color: #fff; font-size: 15.5px; font-weight: 700;
    background: linear-gradient(135deg, var(--brand-600), var(--brand-500));
    box-shadow: 0 8px 22px rgba(36,60,156,.28);
  }
  .nav a.nav-cta:hover, .nav a.nav-cta:active {
    color: #fff; background: linear-gradient(135deg, var(--brand-700), var(--brand-600));
  }
  .g3, .g2 { grid-template-columns: minmax(0, 1fr); }
  .steps.c3, .steps.c4, .steps.c6 { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .spec-row { grid-template-columns: minmax(0, 1fr); }
  .cta-band { padding: 44px 26px; }
  .quote-band { padding: 26px 24px; }
}
@media (max-width: 560px) {
  .container, .container-narrow { padding: 0 18px; }
  .section { padding: 52px 0; }
  .g4, .steps.c3, .steps.c4, .steps.c6 { grid-template-columns: minmax(0, 1fr); }
  .pledge { grid-template-columns: minmax(0, 1fr); }
  .hero { padding: 66px 0 74px; }
  .header-inner { height: 66px; }
  .nav { inset: 66px 0 auto 0; max-height: calc(100vh - 66px); }
  @supports (height: 100dvh) { .nav { max-height: calc(100dvh - 66px); } }
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .faq-a-inner { padding-left: 4px; }
  .hero-facts { gap: 22px; }
  .hero-fact strong { font-size: 22px; }
  .card { padding: 22px 20px; }
}