:root {
  --bg: #eef8f5;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(10, 89, 103, 0.12);
  --text: #0f2d35;
  --muted: #4f6d72;
  --accent: #0e8fa1;
  --accent-strong: #0a5f6e;
  --accent-soft: #dff8f4;
  --shadow: 0 24px 80px rgba(19, 74, 85, 0.14);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 188, 212, 0.18), transparent 24%),
    radial-gradient(circle at 85% 10%, rgba(255, 255, 255, 0.9), transparent 22%),
    linear-gradient(180deg, #f6fffd, #dff1ed 52%, #eef8f5);
}

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

.page-shell {
  width: min(1240px, calc(100vw - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0 14px;
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px 8px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 10px 30px rgba(18, 74, 83, 0.08);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.6);
  color: var(--accent-strong);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, 0.95fr);
  gap: 32px;
  align-items: center;
  padding: 44px 0 52px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-strong);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 800;
}

.hero h1,
.section-head h2,
.faq-item h3,
.feature-card h3 {
  margin: 0;
}

.hero h1 {
  max-width: 13ch;
  font-size: clamp(40px, 6vw, 48px);
  line-height: 1.3;
  /* letter-spacing: 0.04em; */
}

.hero-text {
  max-width: 660px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #f7ffff;
  box-shadow: 0 18px 36px rgba(8, 111, 128, 0.28);
}

.btn-secondary {
  border: 1px solid rgba(10, 95, 110, 0.16);
  background: rgba(255, 255, 255, 0.66);
  color: var(--accent-strong);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.stat-card,
.feature-card,
.download-card,
.faq-item,
.admin-shell-card {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.stat-card {
  display: grid;
  gap: 10px;
  min-height: 126px;
  padding: 18px;
  border-radius: 22px;
}

.stat-card strong {
  font-size: 18px;
}

.stat-card span {
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.hero-visual {
  position: relative;
  min-height: 620px;
  display: grid;
  place-items: center;
}

.hero-orbit {
  position: absolute;
  border-radius: 999px;
  filter: blur(2px);
}

.orbit-a {
  inset: 80px 70px auto auto;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(9, 203, 198, 0.28), rgba(9, 203, 198, 0.02));
}

.orbit-b {
  inset: auto auto 60px 10px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(16, 156, 167, 0.2), rgba(16, 156, 167, 0.02));
}

.hero-device {
  position: relative;
  width: min(100%, 560px);
  padding: 18px;
  border-radius: 34px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(238, 252, 250, 0.58)),
    linear-gradient(135deg, rgba(14, 143, 161, 0.16), rgba(10, 95, 110, 0.05));
  box-shadow:
    0 32px 70px rgba(11, 68, 79, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.86);
  transform: rotate(-5deg);
}

.device-topbar {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.device-topbar span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(16, 104, 118, 0.22);
}

.device-body {
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr);
  gap: 14px;
}

.device-sidebar,
.device-main,
.browser-panel,
.config-card,
.browser-strip,
.admin-block,
.table-line {
  border-radius: 22px;
}

.device-sidebar {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 12px;
  background: rgba(9, 98, 110, 0.08);
}

.mini-chip {
  padding: 11px 14px;
  border-radius: 999px;
  color: #32646b;
  background: rgba(255, 255, 255, 0.68);
  font-size: 13px;
  font-weight: 800;
}

.mini-chip.is-active {
  background: linear-gradient(135deg, #18b8ca, #0d6774);
  color: #f4ffff;
}

.device-main {
  padding: 12px;
  background: rgba(255, 255, 255, 0.62);
}

.browser-strip {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 12px;
  background: rgba(9, 98, 110, 0.08);
}

.browser-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: #44b3bf;
}

.browser-url {
  margin-left: 6px;
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  color: #4c6f74;
  font-size: 13px;
  font-weight: 700;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.browser-panel {
  display: grid;
  align-items: end;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  min-height: 220px;
  margin-top: 12px;
  padding: 18px;
  background:
    radial-gradient(circle at top, rgba(36, 195, 194, 0.28), transparent 40%),
    linear-gradient(180deg, rgba(7, 118, 130, 0.22), rgba(7, 118, 130, 0.06));
}

.signal {
  border-radius: 18px 18px 12px 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(198, 246, 242, 0.54));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.88);
}

.signal-fast {
  min-height: 82%;
}

.signal-mid {
  min-height: 58%;
}

.signal-low {
  min-height: 34%;
}

.config-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.config-card {
  min-height: 76px;
  background: rgba(255, 255, 255, 0.82);
}

.config-card.wide {
  grid-column: 1 / -1;
}

.section {
  padding: 34px 0 18px;
}

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

.section-head h2 {
  font-size: clamp(28px, 4vw, 48px);
  /* line-height: 1.08; */
  letter-spacing: -0.03em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.feature-card {
  min-height: 210px;
  padding: 24px;
  border-radius: 26px;
}

.feature-card p,
.section-note,
.faq-item p,
.download-card p,
.check-list li {
  color: var(--muted);
  line-height: 1.8;
}

.feature-card p,
.faq-item p,
.download-card p {
  margin: 14px 0 0;
}

.section-highlight {
  margin-top: 10px;
}

.system-board {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.system-pill {
  padding: 14px 18px;
  border: 1px solid rgba(10, 95, 110, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--accent-strong);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.section-note {
  margin: 18px 0 0;
  max-width: 760px;
}

.admin-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.8fr);
  gap: 24px;
  align-items: center;
  margin-top: 24px;
}

.check-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 24px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(135deg, #17c7c5, #0c7180);
  box-shadow: 0 0 0 6px rgba(23, 199, 197, 0.12);
}

.admin-shell-card {
  padding: 24px;
  border-radius: 30px;
}

.admin-row {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 16px;
}

.admin-block {
  min-height: 88px;
  background: linear-gradient(180deg, rgba(14, 143, 161, 0.16), rgba(10, 95, 110, 0.06));
}

.admin-block.narrow {
  min-height: 220px;
}

.admin-table {
  display: grid;
  gap: 12px;
}

.table-line {
  min-height: 54px;
  background: rgba(255, 255, 255, 0.88);
}

.table-line.short {
  width: 68%;
}

.download-section {
  padding-top: 42px;
}

.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 30px;
  border-radius: 30px;
  background:
    radial-gradient(circle at right top, rgba(6, 188, 201, 0.22), transparent 22%),
    var(--panel-strong);
}

.download-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  flex: 0 0 auto;
}

.faq-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.faq-item {
  padding: 22px;
  border-radius: 24px;
}

.faq-item h3 {
  font-size: 20px;
  line-height: 1.3;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 26px 0 34px;
  color: #60767a;
  font-size: 13px;
  font-weight: 700;
}

@media (max-width: 1100px) {
  .hero,
  .admin-layout,
  .download-card {
    grid-template-columns: 1fr;
  }

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

  .hero-visual {
    min-height: 540px;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100vw - 20px, 100%);
  }

  .site-header,
  .site-footer,
  .hero-actions,
  .download-actions,
  .hero-stats,
  .feature-grid,
  .faq-list {
    grid-template-columns: 1fr;
  }

  .site-header,
  .site-footer,
  .hero-actions,
  .download-card,
  .hero-stats {
    display: grid;
  }

  .site-header {
    padding-top: 14px;
  }

  .site-nav {
    gap: 6px;
  }

  .hero {
    padding-top: 26px;
  }

  .hero h1 {
    max-width: none;
    font-size: 42px;
  }

  .hero-text {
    font-size: 16px;
  }

  .hero-stats {
    gap: 12px;
  }

  .hero-device {
    transform: none;
  }

  .device-body,
  .admin-row {
    grid-template-columns: 1fr;
  }

  .device-sidebar {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    overflow: auto;
  }

  .feature-grid,
  .faq-list {
    gap: 14px;
  }

  .download-card {
    padding: 22px;
  }
}