/* =========================================================
   产品落地页样式（纸服通 / 工业智能体）
   独立于首页整屏分页，复用 style.css 的设计变量与基础组件
   ========================================================= */

.prod-page {
  background: var(--bg);
}

/* ---------- 首屏 ---------- */
.prod-hero {
  position: relative;
  padding: calc(var(--header-h) + 76px) 0 68px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1100px 420px at 10% -12%, rgba(29, 78, 216, 0.13), transparent 62%),
    radial-gradient(880px 380px at 102% -6%, rgba(8, 145, 178, 0.12), transparent 58%),
    var(--bg);
  overflow: hidden;
}

.prod-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--faint);
}

.prod-crumb a:hover {
  color: var(--blue);
}

.prod-crumb span {
  opacity: 0.6;
}

.prod-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  margin-bottom: 18px;
  border: 1px solid rgba(29, 78, 216, 0.22);
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.06);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
}

.prod-kicker::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(29, 78, 216, 0.12);
}

.prod-hero h1 {
  max-width: 900px;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--head);
}

.prod-hero h1 em {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.34em;
  font-style: normal;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}

.prod-lead {
  max-width: 760px;
  margin-top: 20px;
  font-size: clamp(16px, 1.5vw, 18.5px);
  line-height: 1.85;
  color: var(--muted);
}

.prod-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.prod-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.prod-chips span {
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 13px;
  color: var(--muted);
}

.prod-chips span b {
  color: var(--head);
  font-weight: 700;
}

/* ---------- 通用区块 ---------- */
.prod-section {
  padding: 66px 0;
}

.prod-section.tint {
  background: var(--tint);
}

.prod-sec-head {
  max-width: 820px;
  margin-bottom: 34px;
}

.prod-eyebrow {
  display: block;
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue);
}

.prod-sec-head h2 {
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.3;
  color: var(--head);
}

.prod-sec-head p {
  margin-top: 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 痛点 ---------- */
.prod-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.prod-card {
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 18px 40px -34px rgba(10, 22, 38, 0.45);
}

.prod-card .no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--blue);
  opacity: 0.75;
}

.prod-card h3 {
  margin-bottom: 8px;
  font-size: 17.5px;
  color: var(--head);
}

.prod-card p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 能力模块 ---------- */
.prod-modules {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.prod-module {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.prod-module:hover {
  transform: translateY(-3px);
  border-color: rgba(29, 78, 216, 0.28);
  box-shadow: 0 20px 40px -30px rgba(10, 22, 38, 0.5);
}

.prod-module i {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--teal);
}

.prod-module h4 {
  margin-bottom: 6px;
  font-size: 15.5px;
  color: var(--head);
}

.prod-module p {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 双栏 ---------- */
.prod-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.prod-panel {
  padding: 26px 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.prod-panel.accent {
  border-color: rgba(29, 78, 216, 0.24);
  background: linear-gradient(150deg, rgba(29, 78, 216, 0.06), rgba(8, 145, 178, 0.04));
}

.prod-panel h3 {
  margin-bottom: 14px;
  font-size: 17px;
  color: var(--head);
}

.prod-panel ul {
  display: grid;
  gap: 9px;
}

.prod-panel li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.prod-panel li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--blue);
}

.prod-panel li b {
  color: var(--head);
  font-weight: 700;
}

/* ---------- 流程 ---------- */
.prod-steps {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  counter-reset: step;
}

.prod-step {
  position: relative;
  padding: 18px 14px 16px;
  border: 1px solid var(--line);
  border-top: 3px solid rgba(29, 78, 216, 0.5);
  border-radius: 12px;
  background: var(--surface);
}

.prod-step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--blue);
}

.prod-step h4 {
  margin-bottom: 4px;
  font-size: 14px;
  color: var(--head);
}

.prod-step p {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 边界 / 信任 ---------- */
.prod-trust {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.prod-trust article {
  padding: 22px 20px;
  border: 1px solid rgba(8, 145, 178, 0.22);
  border-radius: 14px;
  background: linear-gradient(150deg, rgba(8, 145, 178, 0.07), rgba(29, 78, 216, 0.03));
}

.prod-trust h4 {
  margin-bottom: 6px;
  font-size: 15px;
  color: var(--head);
}

.prod-trust p {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 案例占位 ---------- */
.prod-case {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px 30px;
  border: 1px dashed rgba(29, 78, 216, 0.35);
  border-radius: var(--radius);
  background: rgba(29, 78, 216, 0.04);
}

.prod-case .tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.12);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
}

.prod-case h3 {
  margin-bottom: 6px;
  font-size: 18px;
  color: var(--head);
}

.prod-case p {
  max-width: 640px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- FAQ ---------- */
.prod-faq {
  display: grid;
  gap: 10px;
  max-width: 880px;
}

.prod-faq details {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  overflow: hidden;
}

.prod-faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--head);
  cursor: pointer;
  list-style: none;
}

.prod-faq summary::-webkit-details-marker {
  display: none;
}

.prod-faq summary::after {
  content: "+";
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 18px;
  color: var(--blue);
  transition: transform 0.2s ease;
}

.prod-faq details[open] summary::after {
  content: "–";
}

.prod-faq details p {
  padding: 0 20px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 底部 CTA ---------- */
.prod-cta {
  padding: 70px 0;
  background: linear-gradient(135deg, #0a1626 0%, #10305e 55%, #0b4f63 100%);
  color: #e8eefb;
}

.prod-cta h2 {
  max-width: 720px;
  font-size: clamp(24px, 3vw, 34px);
  color: #ffffff;
}

.prod-cta p {
  max-width: 640px;
  margin-top: 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(232, 238, 251, 0.78);
}

.prod-cta .prod-actions {
  margin-top: 26px;
}

.prod-cta .btn-primary {
  background: #ffffff;
  color: #0a1626;
  border-color: #ffffff;
}

.prod-cta .btn-primary:hover {
  background: rgba(255, 255, 255, 0.88);
}

.prod-cta .btn-ghost {
  border-color: rgba(255, 255, 255, 0.4);
  color: #ffffff;
}

.prod-cta .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.7);
}

.prod-cta-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 30px;
  margin-top: 26px;
  font-size: 13.5px;
  color: rgba(232, 238, 251, 0.7);
}

.prod-cta-meta a {
  color: #9fc0ff;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .prod-modules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .prod-trust {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .prod-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .prod-hero {
    padding: calc(var(--header-h) + 52px) 0 52px;
  }

  .prod-section {
    padding: 48px 0;
  }

  .prod-grid-3,
  .prod-split,
  .prod-modules,
  .prod-trust {
    grid-template-columns: minmax(0, 1fr);
  }

  .prod-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .prod-case {
    padding: 24px 20px;
  }
}