/* ============================================================
   空调管家ERP · 产品宣传站
   风格：简洁大气 · 明亮主题
   ============================================================ */

:root {
  /* 色彩系统 */
  --primary: #1B6DE0;
  --primary-dark: #0E4FB3;
  --primary-light: #E8F1FD;
  --accent: #00B8D9;
  --accent-light: #E0F7FB;
  --bg: #FFFFFF;
  --bg-alt: #F5F9FF;
  --bg-soft: #F0F6FF;
  --text: #1F2A3D;
  --text-secondary: #5A6B85;
  --text-muted: #8A99B0;
  --border: #E3EBF6;
  --green: #16A34A;
  --green-light: #E6F6EC;
  --orange: #EA8A1E;
  --orange-light: #FDF2E3;
  --red: #E05252;
  --red-light: #FCEBEB;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 8px rgba(27, 109, 224, 0.06);
  --shadow-md: 0 10px 30px rgba(27, 109, 224, 0.10);
  --shadow-lg: 0 24px 60px rgba(15, 60, 130, 0.14);
  --nav-h: 72px;
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.pc-only { display: inline; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px) scale(.98); }

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #3E8BF0 100%);
  color: #fff;
  box-shadow: 0 8px 20px rgba(27, 109, 224, 0.32);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(27, 109, 224, 0.40); }

.btn-ghost {
  background: #fff;
  color: var(--primary);
  border-color: #C9DCF7;
}
.btn-ghost:hover { border-color: var(--primary); background: var(--primary-light); transform: translateY(-2px); }

.btn-white {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0, 0, 0, 0.16); }

.btn-lg { padding: 16px 40px; font-size: 17px; }

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.navbar.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-mark { width: 34px; height: 34px; }
.logo-mark svg { width: 100%; height: 100%; filter: drop-shadow(0 4px 8px rgba(27,109,224,.3)); }
.logo-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .5px;
  color: var(--text);
}
.logo-text em {
  font-style: normal;
  color: var(--primary);
  margin-left: 3px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
}
.nav-links a {
  font-size: 15.5px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color .2s ease;
}
.nav-links a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: -6px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--primary);
  transition: right .25s ease;
}
.nav-links a:not(.nav-cta):hover { color: var(--primary); }
.nav-links a:not(.nav-cta):hover::after { right: 0; }

.nav-cta {
  padding: 9px 22px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff !important;
  font-weight: 600;
  box-shadow: 0 6px 14px rgba(27, 109, 224, 0.3);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 8px 18px rgba(27, 109, 224, 0.4); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 9px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--nav-h) + 72px) 0 96px;
  background: linear-gradient(180deg, #EDF5FF 0%, #FFFFFF 100%);
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: .55;
}
.blob-a {
  width: 520px; height: 520px;
  top: -180px; right: -120px;
  background: radial-gradient(circle, #BBDCFF 0%, transparent 70%);
}
.blob-b {
  width: 420px; height: 420px;
  bottom: -200px; left: -140px;
  background: radial-gradient(circle, #C6F2FA 0%, transparent 70%);
}
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(27, 109, 224, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 109, 224, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.9) 0%, transparent 85%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.9) 0%, transparent 85%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
}

.hero-badge {
  display: inline-block;
  padding: 7px 18px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid #D4E5FB;
  color: var(--primary);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 1px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 26px;
}

.hero h1 {
  font-size: clamp(2.1rem, 4.6vw, 3.3rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: 1px;
  margin-bottom: 22px;
}
.hero h1 .hl {
  color: var(--primary);
  position: relative;
  white-space: nowrap;
}
.hero h1 .hl::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 4px;
  height: 10px;
  background: linear-gradient(90deg, rgba(0,184,217,.28), rgba(27,109,224,.28));
  border-radius: 4px;
  z-index: -1;
}

.hero-sub {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--text-secondary);
  margin-bottom: 34px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 30px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}
.hero-points li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-secondary);
}
.hero-points li::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--green-light) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2316A34A' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center/9px no-repeat;
}

/* Hero 仪表盘视觉 */
.hero-visual { position: relative; }

.dash-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  padding: 20px;
  position: relative;
  z-index: 2;
}

.dash-head {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.dash-head .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #E1E9F4;
}
.dash-head .dot:nth-child(1) { background: #FFB4B4; }
.dash-head .dot:nth-child(2) { background: #FFD9A0; }
.dash-head .dot:nth-child(3) { background: #A8E6C1; }
.dash-title {
  margin-left: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.dash-kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}
.kpi {
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.kpi-label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.kpi-value {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
}
.kpi-value .unit { font-size: 12px; font-weight: 600; color: var(--text-muted); margin-left: 2px; }
.kpi-value.up { color: var(--green); }
.kpi-value.warn { color: var(--orange); }

.dash-chart {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 118px;
  padding: 6px 4px 0;
  margin-bottom: 16px;
  border-bottom: 1px dashed var(--border);
}
.chart-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  gap: 5px;
}
.chart-col i {
  width: 100%;
  max-width: 26px;
  height: var(--h);
  border-radius: 5px 5px 0 0;
  background: linear-gradient(180deg, #6FA8F2 0%, var(--primary) 100%);
  transform-origin: bottom;
  animation: grow 1s cubic-bezier(.22,.9,.3,1.2) backwards;
}
.chart-col:nth-child(2) i { animation-delay: .06s; }
.chart-col:nth-child(3) i { animation-delay: .12s; }
.chart-col:nth-child(4) i { animation-delay: .18s; }
.chart-col:nth-child(5) i { animation-delay: .24s; }
.chart-col:nth-child(6) i { animation-delay: .30s; background: linear-gradient(180deg, #4FD6EA 0%, var(--accent) 100%); }
.chart-col:nth-child(7) i { animation-delay: .36s; background: linear-gradient(180deg, #4FD6EA 0%, var(--accent) 100%); }
.chart-col:nth-child(8) i { animation-delay: .42s; }
@keyframes grow { from { transform: scaleY(0); } }
.chart-col b { font-size: 11px; font-weight: 500; color: var(--text-muted); }

.dash-rows { display: flex; flex-direction: column; gap: 8px; }
.dash-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  background: #fff;
}
.tag {
  flex-shrink: 0;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}
.tag-blue   { background: var(--primary-light); color: var(--primary); }
.tag-cyan   { background: var(--accent-light);  color: #0790AA; }
.tag-green  { background: var(--green-light);   color: var(--green); }
.tag-orange { background: var(--orange-light);  color: var(--orange); }
.row-text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row-time { flex-shrink: 0; font-size: 12px; color: var(--text-muted); }

.float-chip {
  position: absolute;
  z-index: 3;
  padding: 10px 18px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  animation: float 4s ease-in-out infinite;
}
.chip-a { top: -18px; right: 8px; color: var(--orange); }
.chip-a::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--orange); margin-right: 8px; vertical-align: 1px; }
.chip-b { bottom: -16px; left: -10px; color: var(--primary); animation-delay: 1.6s; }
.chip-b::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); margin-right: 8px; vertical-align: 1px; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ---------- 通用 Section ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}
.eyebrow {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2.5px;
  color: var(--primary);
  margin-bottom: 14px;
}
.eyebrow::before, .eyebrow::after {
  content: "";
  display: inline-block;
  width: 26px; height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary));
  vertical-align: 4px;
  margin-right: 10px;
  border-radius: 2px;
}
.eyebrow::after {
  background: linear-gradient(90deg, var(--primary), transparent);
  margin: 0 0 0 10px;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: 1px;
  line-height: 1.35;
  margin-bottom: 16px;
}
.section-desc {
  font-size: clamp(.98rem, 1.5vw, 1.08rem);
  color: var(--text-secondary);
}
.section-desc strong { color: var(--primary); font-weight: 700; }

/* ---------- 行业洞察 ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 64px;
}
.stat-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity .25s ease;
}
.stat-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.stat-card:hover::before { opacity: 1; }
.stat-value {
  font-size: clamp(2rem, 3.4vw, 2.6rem);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.stat-unit {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 6px;
}
.stat-label {
  margin-top: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.channel-block {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 44px 40px;
  box-shadow: var(--shadow-sm);
}
.block-title {
  font-size: clamp(1.25rem, 2.2vw, 1.55rem);
  font-weight: 800;
  margin-bottom: 30px;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
}
.block-title span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}
.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.channel-card {
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  padding: 24px 20px;
  transition: transform .25s ease, background .25s ease;
}
.channel-card:hover { transform: translateY(-4px); background: var(--bg-soft); }
.channel-num {
  font-size: clamp(1.35rem, 2.2vw, 1.7rem);
  font-weight: 800;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}
.channel-num span { font-size: 14px; font-weight: 600; }
.channel-card h4 { font-size: 16.5px; font-weight: 700; margin-bottom: 8px; }
.channel-card p:last-child { font-size: 13.5px; color: var(--text-secondary); }
.channel-conclusion {
  margin-top: 30px;
  padding: 14px 22px;
  border-radius: var(--radius-sm);
  background: var(--red-light);
  color: #B03A3A;
  font-size: 14.5px;
  font-weight: 600;
  text-align: center;
}

/* ---------- 经营痛点 ---------- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.pain-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
  overflow: hidden;
}
.pain-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.pain-num {
  position: absolute;
  top: 18px; right: 26px;
  font-size: 52px;
  font-weight: 800;
  color: var(--bg-soft);
  line-height: 1;
  user-select: none;
}
.pain-card-feature { border: 1.5px solid #F3C9C9; background: linear-gradient(180deg, #FFFDFD 0%, #fff 100%); }

.pain-icon {
  width: 54px; height: 54px;
  border-radius: 14px;
  background: var(--red-light);
  color: var(--red);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.pain-icon svg { width: 27px; height: 27px; }

.pain-card h3 { font-size: 21px; font-weight: 800; margin-bottom: 10px; }
.pain-lead { font-size: 14.5px; color: var(--text-secondary); margin-bottom: 16px; }
.pain-card ul { display: flex; flex-direction: column; gap: 9px; }
.pain-card ul li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}
.pain-card ul li::before {
  content: "";
  position: absolute;
  left: 2px; top: 9px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--red);
  opacity: .55;
}

/* 安装卡黑洞 · 损失面板 */
.loss-panel {
  background: linear-gradient(135deg, #FFF6F0 0%, var(--red-light) 100%);
  border: 1px solid #F3D4D4;
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  margin-bottom: 16px;
}
.loss-title { font-size: 13.5px; font-weight: 700; color: #B03A3A; margin-bottom: 10px; }
.loss-formula {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.loss-formula i { font-style: normal; color: var(--text-muted); font-weight: 500; }
.loss-formula .loss-total { color: var(--red); font-size: 19px; }
.loss-result {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}
.loss-rate {
  padding: 3px 12px;
  border-radius: 999px;
  background: var(--red);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
}
.loss-arrow strong { color: var(--red); font-size: 16.5px; }

.flow-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.flow-steps li {
  position: relative;
  padding: 7px 14px 7px 26px;
  background: #fff;
  border: 1px dashed #E5B8B8;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: #A34A4A;
}
.flow-steps li::before {
  content: "";
  position: absolute;
  left: 11px; top: 50%;
  transform: translateY(-50%);
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--red);
}
.flow-steps li:last-child { border-style: solid; background: var(--red); color: #fff; }
.flow-steps li:last-child::before { background: #fff; }
.flow-note { font-size: 13px; color: var(--text-muted); }

/* ---------- 解决方案 ---------- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.sol-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  overflow: hidden;
}
.sol-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s ease;
}
.sol-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: #C9DCF7; }
.sol-card:hover::after { transform: scaleX(1); }

.sol-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.sol-num {
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: .85;
}
.sol-icon {
  width: 54px; height: 54px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
.sol-icon svg { width: 27px; height: 27px; }

.sol-card h3 { font-size: 21px; font-weight: 800; margin-bottom: 6px; }
.sol-sub { font-size: 14.5px; color: var(--text-secondary); margin-bottom: 18px; }
.sol-card ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}
.sol-card ul li {
  position: relative;
  padding-left: 26px;
  font-size: 14.5px;
  color: var(--text-secondary);
}
.sol-card ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 3px;
  width: 17px; height: 17px;
  border-radius: 50%;
  background: var(--green-light) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2316A34A' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center/10px no-repeat;
}
.sol-result {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: linear-gradient(90deg, var(--primary-light) 0%, var(--accent-light) 100%);
  color: var(--primary-dark);
  font-size: 14.5px;
  font-weight: 700;
  margin-bottom: 14px;
}
.sol-tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 4px 14px;
  border: 1px dashed var(--border);
  border-radius: 999px;
}

/* ---------- 产品价值 ---------- */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.value-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 38px 30px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
}
.value-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.value-icon {
  width: 62px; height: 62px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
.value-icon svg { width: 30px; height: 30px; }
.value-card h3 { font-size: 19px; font-weight: 800; margin-bottom: 8px; }
.value-point {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.value-card p:last-child { font-size: 14px; color: var(--text-secondary); }

/* ---------- 联系我们 ---------- */
.contact-section { padding-bottom: 110px; }
.contact-card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, #0E4FB3 0%, #1B6DE0 55%, #2FA8E0 100%);
  border-radius: 26px;
  padding: 60px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  box-shadow: 0 30px 70px rgba(14, 79, 179, 0.35);
  color: #fff;
}
.contact-card::before {
  content: "";
  position: absolute;
  top: -120px; right: -80px;
  width: 380px; height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.16) 0%, transparent 68%);
}
.contact-card::after {
  content: "";
  position: absolute;
  bottom: -140px; left: 30%;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.10) 0%, transparent 68%);
}

.contact-copy { position: relative; z-index: 2; }
.contact-copy h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 800; letter-spacing: 1px; margin-bottom: 12px; }
.contact-copy > p { font-size: 16px; opacity: .88; margin-bottom: 28px; }

.contact-person {
  display: flex;
  align-items: center;
  gap: 16px;
}
.avatar {
  width: 58px; height: 58px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  border: 2px solid rgba(255, 255, 255, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  flex-shrink: 0;
}
.person-name { font-size: 17px; font-weight: 700; }
.person-name span {
  font-size: 12.5px;
  font-weight: 500;
  opacity: .8;
  margin-left: 8px;
  padding: 2px 10px;
  border: 1px solid rgba(255,255,255,.4);
  border-radius: 999px;
}
.person-tel {
  display: inline-block;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 1px;
  margin: 2px 0;
  transition: opacity .2s ease;
}
.person-tel:hover { opacity: .8; }
.person-wx { font-size: 13px; opacity: .78; }

.contact-actions {
  position: relative;
  z-index: 2;
  text-align: center;
  flex-shrink: 0;
}
.contact-note { margin-top: 16px; font-size: 13px; opacity: .75; }

/* ---------- 页脚 ---------- */
.footer {
  background: #0F1E33;
  color: #9FB2CC;
  padding: 44px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
}
.footer .logo-text { color: #fff; font-size: 18px; }
.footer-brand p { font-size: 13.5px; margin-top: 6px; }
.footer-meta { text-align: right; font-size: 13px; }
.footer-meta p + p { margin-top: 4px; opacity: .65; }

/* ---------- 滚动显现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.22, .8, .3, 1);
  transition-delay: var(--d, 0s);
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .chart-col i, .float-chip { animation: none !important; }
}

/* ============================================================
   响应式 · 平板 (<= 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero-copy { text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-points { justify-content: center; }
  .hero-visual { max-width: 620px; margin: 0 auto; width: 100%; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .channel-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   响应式 · 手机 (<= 768px)
   ============================================================ */
@media (max-width: 768px) {
  :root { --nav-h: 62px; }
  body { font-size: 15px; }
  .container { padding: 0 18px; }
  .pc-only { display: none; }

  /* 导航：抽屉菜单 */
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    padding: 10px 18px 18px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform .25s ease, opacity .25s ease;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a {
    padding: 14px 6px;
    font-size: 16px;
    border-bottom: 1px solid var(--bg-alt);
  }
  .nav-links a:not(.nav-cta)::after { display: none; }
  .nav-links a:last-child { border-bottom: none; }
  .nav-cta {
    text-align: center;
    margin-top: 12px;
    padding: 12px 22px;
  }

  /* Hero */
  .hero { padding: calc(var(--nav-h) + 48px) 0 72px; }
  .hero-actions .btn { flex: 1; min-width: 140px; }
  .float-chip { font-size: 12px; padding: 8px 14px; }
  .chip-a { right: 0; }
  .chip-b { left: 0; }
  .dash-kpis { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .kpi { padding: 10px; }
  .kpi-value { font-size: 16.5px; }

  /* Section 通用 */
  .section { padding: 68px 0; }
  .section-head { margin-bottom: 40px; }

  /* 行业洞察 */
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .stat-card { padding: 22px 18px; }
  .channel-block { padding: 28px 20px; }
  .channel-grid { grid-template-columns: 1fr; gap: 14px; }

  /* 痛点 & 方案 */
  .pain-grid, .solution-grid { grid-template-columns: 1fr; gap: 18px; }
  .pain-card, .sol-card { padding: 28px 22px; }
  .pain-num { font-size: 42px; top: 14px; right: 18px; }

  /* 价值 */
  .value-grid { grid-template-columns: 1fr; gap: 18px; }

  /* 联系 */
  .contact-section { padding-bottom: 80px; }
  .contact-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 40px 26px;
    gap: 30px;
  }
  .contact-actions { text-align: left; width: 100%; }
  .contact-actions .btn { width: 100%; }
  .person-tel { font-size: 21px; }

  /* 页脚 */
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-meta { text-align: center; }
}

/* ============================================================
   响应式 · 小屏手机 (<= 400px)
   ============================================================ */
@media (max-width: 400px) {
  .hero h1 { font-size: 1.75rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-points { flex-direction: column; gap: 8px; align-items: flex-start; }
  .stats-grid { grid-template-columns: 1fr; }
  .dash-kpis { grid-template-columns: 1fr 1fr; }
  .loss-formula { font-size: 14px; }
}