:root {
  --ink: #14202e;
  --muted: #5b6675;
  --line: #dce5ee;
  --paper: #f7fafc;
  --white: #ffffff;
  --blue: #2563eb;
  --teal: #0891b2;
  --green: #17a46b;
  --amber: #d97706;
  --shadow: 0 20px 60px rgba(26, 43, 68, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 5vw;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(220, 229, 238, 0.85);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--teal));
  border-radius: 8px;
}

.nav {
  display: flex;
  gap: 28px;
  color: var(--muted);
  font-size: 14px;
}

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

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
}

.header-cta,
.btn.primary {
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 10px 26px rgba(37, 99, 235, 0.25);
}

.btn.secondary {
  color: var(--ink);
  background: var(--white);
  border-color: var(--line);
}

.hero {
  position: relative;
  min-height: calc(100vh - 68px);
  display: grid;
  align-items: center;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  background-image: url("./assets/hero-cloud-storage.png");
  background-size: cover;
  background-position: center right;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(247, 250, 252, 0.98) 0%, rgba(247, 250, 252, 0.9) 38%, rgba(247, 250, 252, 0.36) 72%, rgba(247, 250, 252, 0.18) 100%),
    linear-gradient(0deg, rgba(247, 250, 252, 0.94) 0%, rgba(247, 250, 252, 0) 34%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(720px, 90vw);
  margin-left: 5vw;
  padding: 70px 0 120px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 14px;
  font-weight: 800;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(40px, 6vw, 70px);
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.hero-copy {
  max-width: 610px;
  color: var(--muted);
  font-size: 19px;
}

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

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  max-width: 620px;
  margin-top: 46px;
}

.hero-stats div {
  padding: 18px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(220, 229, 238, 0.9);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(26, 43, 68, 0.08);
}

.hero-stats strong,
.hero-stats span {
  display: block;
}

.hero-stats span {
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 92px 5vw;
}

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-head p,
.support-copy p,
.contact p {
  color: var(--muted);
}

.value-grid,
.faq-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.value-grid article,
.faq-grid details,
.support-list div {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(26, 43, 68, 0.06);
}

.value-grid article {
  padding: 26px;
}

.icon {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  margin-bottom: 18px;
  padding: 0 12px;
  color: var(--white);
  background: var(--green);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 800;
}

.value-grid article:nth-child(2) .icon {
  background: var(--blue);
}

.value-grid article:nth-child(3) .icon {
  background: var(--amber);
}

.plans {
  background: var(--white);
}

.plan-strip,
.duration-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.plan-strip span {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  min-width: 92px;
  padding: 0 16px;
  color: var(--ink);
  background: #eef6ff;
  border: 1px solid #cfe2f7;
  border-radius: 8px;
  font-weight: 800;
}

.duration-row {
  margin-top: 22px;
}

.duration-row span {
  min-height: 40px;
  padding: 7px 14px;
  color: #12515e;
  background: #e9fbf8;
  border: 1px solid #bfe8e1;
  border-radius: 8px;
  font-weight: 700;
}

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

.timeline div {
  padding: 24px;
  background: var(--white);
  border-top: 4px solid var(--blue);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.timeline b {
  display: block;
  margin-bottom: 24px;
  color: var(--teal);
  font-size: 24px;
}

.support {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 42px;
  align-items: center;
  background: #eef5f7;
}

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

.support-list div {
  padding: 20px 22px;
}

.support-list strong,
.support-list span {
  display: block;
}

.support-list span {
  color: var(--muted);
}

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

.faq-grid details {
  padding: 20px 22px;
}

.faq-grid summary {
  font-weight: 800;
  cursor: pointer;
}

.faq-grid p {
  margin: 14px 0 0;
  color: var(--muted);
}

.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin: 38px 5vw 82px;
  padding: 34px;
  color: var(--white);
  background: linear-gradient(135deg, #163b74, #0f777f 60%, #1c8f63);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.contact .eyebrow,
.contact p {
  color: rgba(255, 255, 255, 0.8);
}

.contact h2 {
  margin-bottom: 8px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 5vw;
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

.float-kf {
  position: fixed;
  right: 20px;
  bottom: 22px;
  z-index: 30;
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  color: var(--white);
  background: var(--green);
  border-radius: 999px;
  box-shadow: 0 14px 34px rgba(23, 164, 107, 0.38);
  font-weight: 800;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  z-index: 40;
  min-width: 180px;
  padding: 12px 16px;
  color: var(--white);
  text-align: center;
  background: rgba(20, 32, 46, 0.94);
  border-radius: 8px;
  opacity: 0;
  transform: translate(-50%, 16px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (max-width: 920px) {
  .nav {
    display: none;
  }

  .hero {
    min-height: auto;
  }

  .hero-content {
    padding: 64px 0 92px;
  }

  .hero-stats,
  .value-grid,
  .timeline,
  .support,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .contact {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .site-header {
    min-height: 62px;
    padding: 0 16px;
  }

  .header-cta {
    min-height: 38px;
    padding: 0 12px;
    font-size: 13px;
  }

  .brand {
    gap: 8px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .hero-content {
    width: auto;
    margin: 0 18px;
  }

  .hero-actions,
  .contact-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .hero-stats {
    gap: 10px;
  }

  .section {
    padding: 68px 18px;
  }

  .plan-strip span {
    min-width: calc(50% - 6px);
  }

  .contact {
    margin: 20px 18px 70px;
    padding: 26px;
  }

  .site-footer {
    flex-direction: column;
    padding: 24px 18px;
  }
}