:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --text: #16181d;
  --muted: #5d6472;
  --border: #e6e8ee;
  --accent: #5b5bd6;
  --accent-2: #8b5cf6;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(31, 35, 60, 0.08);
  --shadow-lg: 0 30px 80px rgba(49, 46, 129, 0.25);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

img {
  display: block;
}

kbd,
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  padding: 1px 6px;
  border-radius: 5px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
}

.container {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 8px 20px rgba(91, 91, 214, 0.35);
}

.btn-ghost {
  color: var(--text);
  border: 1px solid var(--border);
  background: #fff;
}

.btn-light {
  background: #fff;
  color: var(--accent);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 14px;
}

/* nav */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--text);
}

.logo img {
  width: 30px;
  height: 30px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a:not(.btn) {
  color: var(--muted);
  font-size: 15px;
}

.nav-links a:not(.btn):hover {
  color: var(--text);
}

/* hero */

.hero {
  position: relative;
  overflow: hidden;
  padding: 80px 0 60px;
  background:
    radial-gradient(800px 400px at 85% 10%, rgba(139, 92, 246, 0.16), transparent 60%),
    radial-gradient(700px 400px at 0% 90%, rgba(91, 91, 214, 0.12), transparent 60%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 56px;
  align-items: center;
}

.pill {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(91, 91, 214, 0.1);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

.hero h1 {
  margin: 18px 0 16px;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.gradient {
  background: linear-gradient(135deg, var(--accent), var(--accent-2) 60%, #ec4899);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 520px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  margin: 28px 0 14px;
  flex-wrap: wrap;
}

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

/* mockup */

.mock-window {
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  font-size: 12px;
  transform: perspective(1600px) rotateY(-6deg) rotateX(2deg);
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  background: #f1f2f6;
  border-bottom: 1px solid var(--border);
}

.mock-bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff5f57;
}

.mock-bar i:nth-child(2) {
  background: #febc2e;
}

.mock-bar i:nth-child(3) {
  background: #28c840;
}

.mock-bar span {
  margin-left: 12px;
  padding: 2px 14px;
  background: #fff;
  border-radius: 6px;
  color: var(--muted);
}

.mock-app {
  display: grid;
  grid-template-columns: 110px 1fr 120px;
  min-height: 330px;
  background: #f3f4f7;
}

.mock-sidebar,
.mock-tabs {
  background: #fff;
  padding: 12px 8px;
}

.mock-sidebar {
  border-right: 1px solid var(--border);
}

.mock-tabs {
  border-left: 1px solid var(--border);
}

.mock-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  margin-bottom: 10px;
}

.mock-brand img {
  width: 16px;
  height: 16px;
}

.mock-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
  margin: 6px 4px;
}

.mock-space,
.mock-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 6px;
  border-radius: 6px;
  white-space: nowrap;
  overflow: hidden;
}

.mock-space b {
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

.mock-space.active {
  background: rgba(91, 91, 214, 0.12);
  color: var(--accent);
  font-weight: 600;
}

.mock-main {
  padding: 14px 16px;
}

.mock-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 10px;
}

.mock-col {
  margin-bottom: 12px;
}

.mock-col-title {
  font-weight: 650;
  margin-bottom: 6px;
}

.mock-col-title em {
  font-style: normal;
  font-size: 10px;
  padding: 0 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.mock-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.mock-card {
  display: flex;
  gap: 8px;
  padding: 9px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.mock-card s,
.mock-tab s {
  flex: none;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  margin-top: 2px;
}

.mock-card strong {
  display: block;
  font-size: 11px;
}

.mock-card small {
  color: var(--muted);
  font-size: 10px;
}

.mock-card.drop {
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--accent);
  background: rgba(91, 91, 214, 0.06);
  color: var(--accent);
  box-shadow: none;
}

.mock-tab.dragging {
  background: #fff;
  box-shadow: 0 8px 20px rgba(91, 91, 214, 0.3);
  transform: translateX(-26px) rotate(-3deg);
  border: 1px solid var(--accent);
}

/* stats */

.stats {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}

.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 28px 0;
  text-align: center;
}

.stats strong {
  display: block;
  font-size: 22px;
}

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

/* sections */

.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  margin: 0 0 12px;
  text-align: center;
  font-size: clamp(28px, 3.4vw, 38px);
  letter-spacing: -0.01em;
}

.section-sub {
  margin: 0 auto 48px;
  max-width: 640px;
  text-align: center;
  color: var(--muted);
  font-size: 17px;
}

.section-title.left,
.section-sub.left {
  text-align: left;
  margin-left: 0;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature {
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  transition: box-shadow 0.2s, transform 0.2s;
}

.feature:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 28px;
}

.feature h3 {
  margin: 12px 0 6px;
  font-size: 18px;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.step {
  padding: 28px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--border);
}

.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 700;
}

.step h3 {
  margin: 14px 0 6px;
}

.step p {
  margin: 0;
  color: var(--muted);
}

.sync {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: center;
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}

.checklist li {
  position: relative;
  padding: 8px 0 8px 32px;
}

.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 8px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.14);
  color: #10b981;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  line-height: 22px;
}

.sync-diagram {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 32px;
  border-radius: 20px;
  background: linear-gradient(160deg, #eef0ff, #f7f0ff);
  border: 1px solid var(--border);
  text-align: center;
}

.sync-diagram .node {
  padding: 14px;
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow);
  font-weight: 600;
}

.sync-diagram .node.cf {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #f6821f, #fbad41);
  color: #fff;
}

.sync-diagram .arrow {
  grid-column: 1 / -1;
  color: var(--accent);
  font-size: 22px;
}

.install {
  max-width: 720px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.install li {
  position: relative;
  counter-increment: step;
  padding: 18px 20px 18px 64px;
  margin-bottom: 12px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.install li::before {
  content: counter(step);
  position: absolute;
  left: 20px;
  top: 16px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(91, 91, 214, 0.12);
  color: var(--accent);
  font-weight: 700;
  text-align: center;
  line-height: 30px;
}

.faq {
  max-width: 760px;
}

.faq details {
  border-bottom: 1px solid var(--border);
  padding: 18px 4px;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 17px;
  list-style: none;
  display: flex;
  justify-content: space-between;
}

.faq summary::after {
  content: "+";
  color: var(--accent);
  font-size: 22px;
  line-height: 1;
}

.faq details[open] summary::after {
  content: "−";
}

.faq details p {
  margin: 10px 0 0;
  color: var(--muted);
}

.cta {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
}

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.cta h2 {
  margin: 0;
  font-size: clamp(26px, 3.2vw, 36px);
}

.footer {
  padding: 36px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer nav {
  display: flex;
  gap: 22px;
}

.footer nav a {
  color: var(--muted);
}

.copyright {
  margin: 0;
  width: 100%;
  color: var(--muted);
  font-size: 14px;
}

.prose {
  max-width: 760px;
}

.prose h1 {
  font-size: 36px;
  margin-bottom: 4px;
}

.prose h2 {
  margin-top: 36px;
  font-size: 22px;
}

.prose p,
.prose li {
  color: #394150;
}

.muted {
  color: var(--muted);
}

@media (max-width: 960px) {
  .hero-inner,
  .sync {
    grid-template-columns: 1fr;
  }
  .features,
  .steps {
    grid-template-columns: 1fr 1fr;
  }
  .mock-window {
    transform: none;
  }
}

@media (max-width: 640px) {
  .nav-links a:not(.btn) {
    display: none;
  }
  .features,
  .steps,
  .stats-inner {
    grid-template-columns: 1fr;
  }
  .stats-inner {
    gap: 16px;
  }
  .mock-app {
    grid-template-columns: 1fr;
  }
  .mock-sidebar,
  .mock-tabs {
    display: none;
  }
}