:root {
  --bg: #f5f7fc;
  --bg-deep: #edf2ff;
  --surface: rgba(255, 255, 255, 0.75);
  --surface-solid: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(29, 29, 31, 0.09);
  --blue: #0071e3;
  --blue-deep: #0057b8;
  --radius-xl: 34px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --shadow: 0 22px 50px rgba(11, 39, 89, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(1200px 700px at 6% -10%, #d9e5ff 0%, rgba(217, 229, 255, 0) 62%),
    radial-gradient(1000px 680px at 100% 0%, #e8f7ff 0%, rgba(232, 247, 255, 0) 58%),
    linear-gradient(180deg, var(--bg) 0%, #ffffff 48%, var(--bg-deep) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.2) 45%, rgba(255, 255, 255, 0) 100%);
  opacity: 0.6;
}

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

.shell {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 80;
  backdrop-filter: blur(18px);
  background: rgba(246, 248, 252, 0.72);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.top-nav.compact {
  border-color: var(--line);
  background: rgba(248, 249, 252, 0.88);
  box-shadow: 0 8px 28px rgba(16, 36, 79, 0.08);
}

.nav-shell {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(140deg, #0084ff, #47c8ff);
  box-shadow: 0 0 0 4px rgba(0, 132, 255, 0.16);
}

.nav-links {
  display: inline-flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
  color: var(--muted);
}

.nav-links a {
  transition: color 0.2s ease;
}

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

.nav-links .nav-cta {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #2a8dff);
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 600;
}

.nav-links .nav-cta:hover {
  color: #fff;
  filter: brightness(1.04);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text);
}

.hero {
  padding-top: clamp(68px, 10vw, 118px);
  text-align: center;
}

.hero-kicker {
  margin: 0;
  color: var(--blue);
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.hero-title {
  margin: 16px auto 0;
  max-width: 980px;
  font-size: clamp(2.1rem, 6vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.hero-subtitle {
  margin: 20px auto 0;
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.24rem);
  line-height: 1.7;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #2a8dff);
  box-shadow: 0 12px 26px rgba(0, 113, 227, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 16px 30px rgba(0, 113, 227, 0.32);
}

.btn-ghost {
  color: var(--text);
  border: 1px solid rgba(29, 29, 31, 0.18);
  background: rgba(255, 255, 255, 0.66);
}

.product-pane {
  margin: clamp(52px, 8vw, 88px) auto 0;
  max-width: 980px;
  text-align: left;
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.88), rgba(242, 248, 255, 0.92));
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.pane-top {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 24px;
  border-bottom: 1px solid rgba(29, 29, 31, 0.08);
  color: #374151;
  font-size: 14px;
}

.pane-top strong {
  margin-left: 6px;
  font-size: 14px;
  font-weight: 600;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febb2e; }
.dot.green { background: #28c840; }

.pane-body {
  padding: 14px 24px 8px;
}

.line {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 16px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid rgba(29, 29, 31, 0.06);
}

.line:last-child {
  border-bottom: none;
}

.line span {
  font-size: 12px;
  color: #8a8a90;
  font-variant-numeric: tabular-nums;
}

.line p {
  margin: 0;
  line-height: 1.7;
  color: #1f2d40;
  font-size: 15px;
}

.pane-tags {
  padding: 8px 24px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pane-tags span {
  background: rgba(0, 113, 227, 0.1);
  color: #0a5aa8;
  border: 1px solid rgba(0, 113, 227, 0.14);
  font-size: 13px;
  border-radius: 999px;
  padding: 7px 12px;
}

.stats {
  margin-top: clamp(54px, 9vw, 96px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.stat-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.84);
  box-shadow: 0 10px 28px rgba(12, 35, 77, 0.08);
}

.stat-number {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.stat-label {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 15px;
}

.features,
.workflow,
.scenarios {
  margin-top: clamp(70px, 10vw, 112px);
}

.section-head p {
  margin: 0;
  color: var(--blue);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.section-head h2 {
  margin: 14px 0 0;
  max-width: 850px;
  font-size: clamp(1.74rem, 4vw, 3rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
}

.feature-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, #ffffff, #f3f7ff);
  border: 1px solid rgba(29, 29, 31, 0.08);
  padding: 28px;
  min-height: 180px;
  box-shadow: 0 14px 28px rgba(15, 43, 95, 0.08);
}

.feature-card h3 {
  margin: 0;
  font-size: 24px;
  letter-spacing: -0.02em;
}

.feature-card p {
  margin: 14px 0 0;
  color: #4c5563;
  line-height: 1.8;
  font-size: 15px;
}

.step-list {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.step {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(29, 29, 31, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px 24px 26px;
}

.step-index {
  display: inline-flex;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--blue);
  font-weight: 700;
  background: rgba(0, 113, 227, 0.12);
  border-radius: 999px;
  padding: 6px 10px;
}

.step h3 {
  margin: 14px 0 0;
  font-size: 21px;
  letter-spacing: -0.02em;
}

.step p {
  margin: 12px 0 0;
  color: #4c5563;
  line-height: 1.75;
}

.scenario-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.scenario-card {
  padding: 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(29, 29, 31, 0.08);
  background: var(--surface-solid);
  box-shadow: 0 10px 22px rgba(20, 40, 90, 0.07);
}

.scenario-card h3 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.scenario-card p {
  margin: 10px 0 0;
  color: #4f5b6a;
  line-height: 1.75;
  font-size: 14px;
}

.start {
  margin-top: clamp(74px, 11vw, 128px);
  margin-bottom: clamp(60px, 9vw, 100px);
  text-align: center;
  padding: clamp(36px, 7vw, 62px) clamp(24px, 6vw, 46px);
  border-radius: var(--radius-xl);
  background: linear-gradient(145deg, #0a84ff, #0071e3 55%, #0060c3);
  color: #fff;
  box-shadow: 0 26px 56px rgba(0, 81, 167, 0.35);
}

.start h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.22;
  letter-spacing: -0.03em;
}

.start p {
  margin: 14px auto 0;
  max-width: 760px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.9);
}

.start .btn-primary {
  margin-top: 24px;
  background: #fff;
  color: var(--blue-deep);
  box-shadow: none;
}

.footer {
  border-top: 1px solid rgba(29, 29, 31, 0.08);
  padding: 24px 0 34px;
  color: #7f8795;
  font-size: 13px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .stats,
  .feature-grid,
  .step-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: absolute;
    top: 62px;
    right: 24px;
    width: min(240px, calc(100% - 48px));
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(29, 29, 31, 0.1);
    border-radius: 18px;
    box-shadow: 0 24px 45px rgba(17, 37, 73, 0.12);
    padding: 14px;
    display: grid;
    gap: 8px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-links a {
    padding: 9px 10px;
    border-radius: 10px;
  }

  .nav-links a:hover {
    background: rgba(0, 113, 227, 0.08);
  }

  .nav-links .nav-cta {
    text-align: center;
  }
}

@media (max-width: 640px) {
  .shell {
    width: calc(100% - 32px);
  }

  .hero-title {
    letter-spacing: -0.028em;
  }

  .product-pane {
    border-radius: 24px;
  }

  .pane-body {
    padding: 10px 16px 6px;
  }

  .pane-top,
  .pane-tags {
    padding-left: 16px;
    padding-right: 16px;
  }

  .line {
    grid-template-columns: 48px 1fr;
    gap: 10px;
  }

  .line p {
    font-size: 14px;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .start {
    border-radius: 24px;
  }
}