* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --ink: #101318;
  --ink-muted: #5d6675;
  --ink-subtle: #8a94a6;
  --line: rgba(16, 19, 24, 0.1);
  --line-strong: rgba(16, 19, 24, 0.16);
  --blue: #1769ff;
  --blue-deep: #0d47c5;
  --teal: #00a985;
  --green: #14b86f;
  --radius: 8px;
  --max: 1180px;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), var(--bg) 520px), var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
}

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

.container {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(16, 19, 24, 0.08);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(22px);
}

.nav-inner {
  width: min(var(--max), calc(100% - 40px));
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand-mark {
  display: block;
  width: 149px;
  height: 45px;
  background: url("/assets/yl_logo.svg") center / contain no-repeat;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links li {
  position: relative;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 12px;
  border-radius: var(--radius);
  color: var(--ink-muted);
  font-size: 14px;
  font-weight: 520;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-links a:hover {
  background: rgba(16, 19, 24, 0.05);
  color: var(--ink);
}

.nav-dropdown {
  position: fixed;
  top: 72px;
  left: 0;
  width: 100vw;
  padding: 28px 0;
  border: 1px solid var(--line);
  border-right: 0;
  border-left: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(22px);
  box-shadow: 0 18px 42px rgba(16, 24, 40, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
}

.has-dropdown:hover .nav-dropdown,
.has-dropdown:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-menu-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(260px, 0.46fr) minmax(360px, 0.64fr);
  gap: 72px;
}

.mega-group {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  align-content: start;
}

.mega-group:last-child {
  grid-template-columns: 1fr;
}

.mega-group span {
  display: block;
  margin-bottom: 10px;
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 760;
}

.mega-group a {
  display: grid;
  align-content: start;
  min-height: auto;
  padding: 12px 0;
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  color: var(--ink);
  background: transparent;
}

.mega-group a strong {
  margin-bottom: 5px;
  font-size: 15px;
}

.mega-group a small {
  color: var(--ink-muted);
  font-size: 12px;
  line-height: 1.55;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 650;
  line-height: 1;
  white-space: nowrap;
}

.button.primary {
  background: var(--ink);
  color: #fff;
}

.button.secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.button.text {
  padding: 0 8px;
  color: var(--ink-muted);
}

.hero {
  padding: 84px 0 64px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(480px, 1.1fr);
  gap: 46px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 760;
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(20, 184, 111, 0.12);
}

h1 {
  max-width: 760px;
  font-size: clamp(42px, 5vw, 64px);
  font-weight: 760;
  line-height: 1.06;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 620px;
  margin-top: 22px;
  color: var(--ink-muted);
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 18px;
}

.section {
  padding: 86px 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(280px, 0.55fr);
  gap: 56px;
  align-items: end;
  margin-bottom: 44px;
}

.section-kicker {
  margin-bottom: 14px;
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 760;
}

h2 {
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.12;
  letter-spacing: 0;
}

.section-lead {
  color: var(--ink-muted);
  font-size: 16px;
  line-height: 1.9;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 700;
}

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

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

.info-card {
  border-top: 1px solid var(--line);
  padding: 24px 0 0;
}

.info-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 18px;
}

.info-card strong {
  display: block;
  margin-bottom: 12px;
  font-size: 18px;
}

.info-card p,
.info-card li {
  color: var(--ink-muted);
  font-size: 15px;
}

.info-card ul {
  display: grid;
  gap: 9px;
  padding-left: 1.2em;
}

.process {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.process-step {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.process-step span {
  display: block;
  margin-bottom: 12px;
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 760;
}

.process-step strong {
  display: block;
  margin-bottom: 8px;
}

.process-step p {
  color: var(--ink-muted);
  font-size: 14px;
}

.band {
  background: #fff;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(420px, 1fr);
  gap: 48px;
  align-items: center;
}

.split-image img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 16px;
}

.feature-stack {
  display: grid;
  gap: 120px;
}

.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  gap: 56px;
  align-items: center;
}

.feature-row.reverse {
  grid-template-columns: minmax(420px, 1.08fr) minmax(0, 0.92fr);
}

.feature-row.reverse .feature-copy {
  order: 2;
}

.feature-row.reverse .feature-image {
  order: 1;
}

.feature-copy span {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 760;
}

.feature-copy h3 {
  max-width: 620px;
  margin-bottom: 18px;
  font-size: clamp(28px, 3vw, 28px);
  line-height: 1.16;
  letter-spacing: 0;
}

.feature-copy p {
  max-width: 620px;
  color: var(--ink-muted);
  font-size: 16px;
  line-height: 1.9;
}

.feature-points {
  display: grid;
  gap: 10px;
  margin-top: 22px;
  padding-left: 1.15em;
  color: var(--ink-muted);
  font-size: 15px;
}

.feature-image img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 16px;
}

.cta {
  padding: 80px 0;
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 42px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.cta-panel h2 {
  max-width: 680px;
}

.cta-panel p {
  max-width: 640px;
  margin-top: 14px;
  color: var(--ink-muted);
}

.footer {
  border-top: 1px solid var(--line);
  padding: 34px 0;
  color: var(--ink-subtle);
  font-size: 13px;
}

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

@media (max-width: 980px) {
  .nav-inner {
    height: 64px;
    padding: 14px 0;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 16px;
  }

  .menu-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-links {
    display: none;
    order: 3;
    width: 100%;
    padding: 12px 0 14px;
    border-top: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav.is-menu-open .nav-inner {
    height: auto;
    align-items: flex-start;
  }

  .nav.is-menu-open .nav-links {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    justify-content: flex-start;
    padding: 8px 0;
    background: transparent;
  }

  .nav-actions {
    display: none;
  }

  .nav-dropdown {
    display: none;
  }

  .has-dropdown:hover .nav-dropdown,
  .has-dropdown:focus-within .nav-dropdown {
    display: none;
    opacity: 0;
    visibility: hidden;
    transform: none;
  }

  .mega-menu-inner {
    width: 100%;
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .hero-grid,
  .section-heading,
  .split,
  .feature-row,
  .feature-row.reverse,
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .feature-row.reverse .feature-copy,
  .feature-row.reverse .feature-image {
    order: initial;
  }

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

@media (max-width: 620px) {
  .container,
  .nav-inner {
    width: min(100% - 28px, var(--max));
  }

  .hero {
    padding-top: 56px;
  }

  .hero-grid {
    gap: 28px;
  }

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

  .cta-panel {
    display: grid;
  }
}