:root {
  --bg: #f3f7fc;
  --ink: #101c2f;
  --muted: #607086;
  --panel: #ffffff;
  --line: #dfe6ef;
  --blue: #1f6fff;
  --blue-dark: #1452c7;
  --cyan: #19b8ff;
  --ice: #eaf4ff;
  --green: #0f766e;
  --amber: #d99a20;
  --dark: #081a30;
  --shadow: 0 20px 54px rgba(18, 36, 64, .12);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1140px, calc(100% - 32px)); margin: 0 auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 250, 255, .92);
  border-bottom: 1px solid rgba(223, 230, 239, .75);
  backdrop-filter: blur(14px);
}
.nav {
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 23px;
  font-weight: 800;
  white-space: nowrap;
}
.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: url("sledcloud-logo.png") center / contain no-repeat;
  box-shadow: 0 8px 22px rgba(31, 111, 255, .16);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
  color: #34445d;
  font-size: 15px;
  font-weight: 700;
}
.nav-links a:hover { color: var(--blue); }
.btn {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 800;
  white-space: nowrap;
}
.btn-primary { color: #fff; background: var(--blue); box-shadow: 0 12px 26px rgba(37, 99, 235, .22); }
.btn-primary:hover { background: var(--blue-dark); }
.btn-light, .btn-ghost { color: var(--ink); background: #fff; border-color: var(--line); }
.btn-ghost { background: rgba(255, 255, 255, .88); }
.btn-xl { min-height: 52px; padding: 0 24px; font-size: 16px; }
.nav-cta { min-height: 42px; }

.promo-hero {
  position: relative;
  overflow: hidden;
  min-height: 720px;
  padding: 92px 0 74px;
  color: #fff;
  background: #07182d;
}

.promo-media {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 24, 45, .97) 0%, rgba(7, 24, 45, .88) 38%, rgba(7, 24, 45, .46) 66%, rgba(7, 24, 45, .2) 100%),
    url("sledcloud-hero.png") center right / cover no-repeat;
}

.promo-media::after {
  position: absolute;
  inset: auto 0 0;
  height: 150px;
  content: "";
  background: linear-gradient(180deg, rgba(7, 24, 45, 0), var(--bg));
}

.promo-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 680px) minmax(320px, 410px);
  gap: 50px;
  align-items: center;
}

.promo-copy h1 {
  max-width: 760px;
  color: #fff;
  font-size: clamp(42px, 5.1vw, 68px);
  line-height: 1.08;
}

.promo-copy .hero-desc {
  max-width: 650px;
  color: rgba(241, 247, 255, .86);
  font-size: 20px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 30px;
}

.hero-metrics div {
  min-height: 102px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 10px;
  background: rgba(255, 255, 255, .08);
}

.hero-metrics strong {
  display: block;
  color: #fff;
  font-size: 24px;
}

.hero-metrics span {
  display: block;
  margin-top: 4px;
  color: rgba(241, 247, 255, .72);
  font-size: 13px;
  line-height: 1.55;
}

.hero-panel {
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 16px;
  background: rgba(255, 255, 255, .92);
  color: var(--ink);
  box-shadow: 0 34px 80px rgba(0, 0, 0, .28);
}

.hero-panel .status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  color: #0f5fc4;
  background: #e7f2ff;
  font-size: 13px;
  font-weight: 850;
}

.hero-panel h2 {
  margin-top: 18px;
  font-size: 27px;
}

.hero-panel ol {
  display: grid;
  gap: 12px;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}

.hero-panel li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 14px;
  border: 1px solid #e5edf7;
  border-radius: 10px;
  background: #f8fbff;
}

.hero-panel li span {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--blue);
  font-weight: 900;
}

.hero-panel li strong,
.hero-panel li em {
  display: block;
  grid-column: 2;
  font-style: normal;
}

.hero-panel li strong { color: var(--ink); }
.hero-panel li em { color: var(--muted); font-size: 13px; }
.panel-link { color: var(--blue); font-weight: 850; text-decoration: underline; text-underline-offset: 3px; }

.hero {
  padding: 76px 0 54px;
  color: #f8fbff;
  background:
    linear-gradient(135deg, rgba(6, 18, 34, .94), rgba(14, 44, 75, .78)),
    url("sledcloud-hero.png") center / cover no-repeat;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(360px, 1.08fr);
  gap: 38px;
  align-items: center;
}
.hero-copy { max-width: 660px; }
.eyebrow {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin: 0 0 14px;
  color: #9fd0ff;
  font-size: 14px;
  font-weight: 850;
}
.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--amber);
}
h1, h2, h3 { margin: 0; letter-spacing: 0; line-height: 1.28; }
h1 { color: #fff; font-size: clamp(42px, 5vw, 68px); line-height: 1.04; }
h2 { font-size: 34px; }
h3 { margin-bottom: 9px; font-size: 21px; }
.hero-desc {
  max-width: 650px;
  margin: 18px 0 0;
  color: rgba(245, 249, 255, .88);
  font-size: 18px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 26px; }
.trust-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.trust-row span {
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 999px;
  background: rgba(255, 255, 255, .1);
  color: rgba(255, 255, 255, .9);
  font-size: 13px;
}
.hero-visual {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 28px 70px rgba(4, 16, 30, .36);
}

section { padding: 62px 0; }
.band { background: #eef4fb; }
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .72fr);
  gap: 38px;
  align-items: end;
  margin-bottom: 26px;
}
.section-copy, p, li { color: var(--muted); }
.section-copy { margin: 0; }
.center-head {
  display: block;
  max-width: 780px;
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}
.center-head .eyebrow { justify-content: center; }
.center-head .section-copy { margin-top: 12px; }
.grid-3, .steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.plans-section {
  position: relative;
  z-index: 2;
  padding-top: 68px;
}

.residential-section {
  padding: 76px 0;
  border-top: 1px solid #e7eef7;
  border-bottom: 1px solid #e7eef7;
  background: linear-gradient(180deg, #ffffff 0%, #eef7ff 100%);
}

.residential-layout {
  display: grid;
  grid-template-columns: minmax(0, .86fr) minmax(420px, 1fr);
  gap: 34px;
  align-items: center;
}

.residential-copy h2 {
  max-width: 620px;
}

.residential-copy p {
  max-width: 680px;
  margin: 16px 0 0;
  color: #42526a;
  font-size: 18px;
}

.residential-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.residential-tags span {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 0 12px;
  border-radius: 999px;
  color: #1452c7;
  background: #e7f2ff;
  font-size: 14px;
  font-weight: 850;
}

.residential-cards {
  display: grid;
  gap: 12px;
}

.residential-cards article {
  padding: 20px 22px;
  border: 1px solid #d9e8f8;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(18, 36, 64, .08);
}

.residential-cards strong {
  display: block;
  color: #0e1d33;
  font-size: 18px;
}

.residential-cards span {
  display: block;
  margin-top: 5px;
  color: #64748b;
  font-size: 15px;
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 32px;
}

.plan-card {
  position: relative;
  display: flex;
  min-height: 438px;
  flex-direction: column;
  padding: 26px 22px;
  border: 1px solid #dbe6f3;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 16px 42px rgba(18, 36, 64, .08);
}

.plan-card h3 {
  margin-top: 18px;
  font-size: 23px;
}

.plan-card p {
  margin: 10px 0 0;
  font-size: 15px;
}

.plan-card ul {
  display: grid;
  gap: 10px;
  margin: 22px 0 24px;
  padding: 0;
  list-style: none;
}

.plan-card li {
  position: relative;
  padding-left: 24px;
  color: #42526a;
  font-size: 15px;
}

.plan-card li::before {
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #b9dcff;
  content: "";
}

.plan-card .btn { margin-top: auto; }

.plan-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
}

.plan-top span {
  display: inline-flex;
  flex: 0 0 auto;
  min-height: 28px;
  align-items: center;
  padding: 0 10px;
  border-radius: 999px;
  color: #1452c7;
  background: #e8f2ff;
  font-size: 13px;
  font-weight: 850;
  white-space: nowrap;
}

.plan-top strong {
  flex: 0 1 auto;
  color: #bfd2e9;
  font-size: 25px;
  line-height: 1;
  white-space: nowrap;
}

.featured-plan {
  transform: translateY(-12px);
  border-color: rgba(31, 111, 255, .7);
  background: linear-gradient(180deg, #ffffff 0%, #edf6ff 100%);
  box-shadow: 0 28px 70px rgba(31, 111, 255, .18);
}

.ribbon {
  position: absolute;
  top: 16px;
  right: 16px;
  min-height: 28px;
  padding: 3px 10px 0;
  border-radius: 999px;
  color: #fff;
  background: #ff8a00;
  font-size: 13px;
  font-weight: 900;
}

.featured-plan .plan-top {
  margin-top: 16px;
}

.plan-note {
  margin: 18px auto 0;
  max-width: 860px;
  color: #6b7890;
  text-align: center;
  font-size: 14px;
}

.scene-section { background: #fff; }

.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.scene-grid article {
  min-height: 220px;
  padding: 24px;
  border: 1px solid #dde8f5;
  border-radius: 14px;
  background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
}

.scene-icon {
  display: inline-grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 13px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  font-weight: 900;
}

.scene-grid h3 {
  margin-top: 18px;
}

.client-section {
  background: #0b1c32;
  color: #fff;
}

.client-section .section-copy,
.client-section p {
  color: rgba(241, 247, 255, .76);
}

.client-layout {
  display: grid;
  grid-template-columns: minmax(0, .78fr) minmax(420px, 1fr);
  gap: 46px;
  align-items: center;
}

.client-list {
  display: grid;
  gap: 12px;
}

.client-list a {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 12px;
  background: rgba(255, 255, 255, .07);
}

.client-list strong {
  color: #fff;
}

.client-list span {
  color: rgba(241, 247, 255, .7);
  font-size: 14px;
  text-align: right;
}

.compare-section {
  background: #f5f8fc;
}

.compare-table a {
  color: var(--blue);
  font-weight: 850;
}

.official-section {
  padding: 0 0 68px;
  background: #f5f8fc;
}

.official-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 390px);
  gap: 26px;
  align-items: center;
  padding: 32px;
  border: 1px solid #d7e3f0;
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
}

.official-actions {
  display: grid;
  gap: 12px;
}

.faq-section {
  background: #fff;
}
.card, .step, .faq-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}
.card, .step { min-height: 190px; padding: 24px; box-shadow: 0 10px 28px rgba(18, 36, 64, .055); }
.card { display: flex; flex-direction: column; }
.card .btn { align-self: flex-start; margin-top: auto; }
.tag-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 14px; }
.tag {
  display: inline-flex;
  min-height: 25px;
  align-items: center;
  padding: 0 9px;
  border-radius: 999px;
  color: var(--green);
  background: #e8f6f4;
  font-size: 12px;
  font-weight: 800;
}
.official-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.official-grid article {
  display: grid;
  gap: 7px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.official-grid strong { color: var(--ink); font-size: 18px; }
.official-grid span { color: var(--muted); overflow-wrap: anywhere; }
.official-grid a, .text-link { color: var(--blue); font-weight: 850; text-decoration: underline; text-underline-offset: 3px; }
.step-num {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  border-radius: 8px;
  color: var(--blue);
  background: var(--ice);
  font-weight: 900;
}
.compare-table {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
table { width: 100%; min-width: 760px; border-collapse: collapse; font-size: 15px; }
th, td { padding: 13px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: #111827; background: #f8fafc; }
td { color: #4b5563; }
tr:last-child td { border-bottom: 0; }
th:last-child, td:last-child { border-right: 0; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 20px 22px; }
.cta { color: #fff; background: #0e1d33; }
.cta-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
}
.cta h2, .cta p { color: #fff; }
.cta p { margin: 8px 0 0; color: rgba(255, 255, 255, .78); }
footer {
  padding: 34px 0;
  color: #737d8d;
  background: #fff;
  border-top: 1px solid var(--line);
  font-size: 13px;
}
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 18px; }

.page-main {
  width: min(1180px, calc(100% - 32px));
  margin: 24px auto 0;
  display: grid;
  grid-template-columns: minmax(0, 820px) minmax(280px, 1fr);
  gap: 20px;
  align-items: start;
}
.page-hero, .content, .toc {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.page-hero { padding: 30px 34px; }
.page-hero h1 { color: var(--ink); font-size: 42px; }
.post-meta { margin: 10px 0 0; font-size: 14px; }
.content { padding: 30px 34px; }
.content h2 { margin: 30px 0 12px; font-size: 28px; }
.content h2:first-child { margin-top: 0; }
.beginner-panel {
  padding: 20px;
  border: 1px solid #cfe0f5;
  border-radius: 8px;
  background: #f2f7ff;
}
.step-list { margin: 14px 0 0; padding-left: 22px; }
.toc {
  position: sticky;
  top: 104px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.toc h3 { margin-bottom: 8px; font-size: 17px; }
.toc a { display: block; padding: 10px 0; border-bottom: 1px solid #edf0f3; color: #475467; font-size: 15px; }
.toc a:last-child { border-bottom: 0; }

@media (max-width: 900px) {
  body { font-size: 16px; }
  .nav { height: auto; min-height: 78px; flex-wrap: wrap; padding: 14px 0; }
  .nav-links { order: 3; width: 100%; justify-content: flex-start; overflow-x: auto; gap: 18px; }
  .promo-hero { min-height: 0; padding: 58px 0 48px; }
  .promo-media {
    background:
      linear-gradient(180deg, rgba(7, 24, 45, .96), rgba(7, 24, 45, .72)),
      url("sledcloud-hero.png") center / cover no-repeat;
  }
  .promo-hero-inner,
  .hero-metrics,
  .residential-layout,
  .plan-grid,
  .scene-grid,
  .client-layout,
  .official-box {
    grid-template-columns: 1fr;
  }
  .promo-copy h1 { font-size: 42px; }
  .promo-copy .hero-desc { font-size: 17px; }
  .hero-panel { margin-top: 6px; }
  .featured-plan { transform: none; }
  .hero { padding: 54px 0 44px; }
  .hero-grid, .section-head, .grid-3, .steps, .official-grid, .cta-box, .page-main { grid-template-columns: 1fr; }
  h1, .page-hero h1 { font-size: 38px; }
  h2 { font-size: 29px; }
  .toc { position: static; }
}

@media (max-width: 560px) {
  .container { width: min(100% - 24px, 1140px); }
  .brand { font-size: 20px; }
  .hero-actions, .hero-actions .btn, .cta-box .btn { width: 100%; }
  .btn-xl { min-height: 48px; }
  .plan-card,
  .scene-grid article,
  .residential-layout,
  .official-box {
    border-radius: 12px;
  }
  .client-list a {
    display: grid;
  }
  .client-list span {
    text-align: left;
  }
  .page-hero, .content { padding: 24px 20px; }
}