:root {
  color-scheme: light;
  --bg: #f4f8ff;
  --bg-soft: #e9f2ff;
  --surface: #ffffff;
  --surface-raised: #f8fbff;
  --text: #172554;
  --muted: #52667d;
  --quiet: #8190a5;
  --line: rgba(37, 99, 235, 0.14);
  --line-strong: rgba(37, 99, 235, 0.24);
  --blue: #2563eb;
  --blue-soft: rgba(37, 99, 235, 0.12);
  --cyan: #0891b2;
  --indigo: #4f46e5;
  --violet: #7c3aed;
  --teal: #0f766e;
  --max: 1180px;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(rgba(37, 99, 235, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 145, 178, 0.04) 1px, transparent 1px),
    linear-gradient(135deg, #f8fbff 0%, #edf6ff 48%, #f6f1ff 100%);
  background-size: 72px 72px, 72px 72px, auto;
}

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

img,
svg {
  display: block;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(248, 251, 255, 0.88);
  backdrop-filter: blur(20px);
}

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

.nav-shell {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  width: max-content;
  align-items: center;
  gap: 10px;
}

.brand img {
  width: 40px;
  height: 40px;
}

.brand-text {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  line-height: 1;
}

.brand-text strong {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-text span {
  color: var(--quiet);
  font-size: 13px;
  font-weight: 650;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a,
.nav-cta,
.button,
.plan-action {
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

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

.nav-cta {
  justify-self: end;
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--blue);
  font-size: 14px;
  font-weight: 640;
}

.nav-cta svg,
.button svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.nav-cta:hover,
.nav-cta:focus-visible {
  border-color: rgba(37, 99, 235, 0.38);
  background: rgba(37, 99, 235, 0.08);
}

.section {
  padding: 112px 0;
}

.hero {
  display: grid;
  min-height: calc(100svh - 210px);
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.88fr);
  align-items: center;
  gap: 72px;
  padding-top: 56px;
  padding-bottom: 52px;
}

.hero-copy {
  min-width: 0;
}

.mobile-line-break {
  display: none;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 720;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(48px, 7vw, 92px);
  line-height: 0.98;
  font-weight: 780;
  letter-spacing: 0;
  color: var(--text);
}

h1 span {
  display: block;
}

h1 span:first-child {
  color: var(--blue);
}

.hero-subtitle {
  max-width: 640px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.hero-subtitle span {
  display: inline;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 32px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 18px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
}

.button-primary {
  border: 1px solid rgba(37, 99, 235, 0.92);
  background: linear-gradient(135deg, #2563eb 0%, #0891b2 100%);
  color: #ffffff;
  box-shadow: 0 16px 34px rgba(37, 99, 235, 0.24);
}

.button-primary:hover,
.button-primary:focus-visible {
  transform: translateY(-1px);
  background: linear-gradient(135deg, #1d4ed8 0%, #0e7490 100%);
}

.button-secondary {
  border: 1px solid var(--line-strong);
  color: var(--text);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: rgba(37, 99, 235, 0.34);
  background: rgba(37, 99, 235, 0.08);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-points span,
.audience-grid span {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.04);
}

.hero-points span {
  padding: 8px 11px;
  font-size: 13px;
}

.hero-visual {
  position: relative;
  overflow: hidden;
  min-width: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(rgba(37, 99, 235, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 145, 178, 0.055) 1px, transparent 1px),
    linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(232, 242, 255, 0.92));
  background-size: 40px 40px;
  box-shadow: 0 32px 80px rgba(37, 99, 235, 0.14);
}

.hero-visual::after {
  position: absolute;
  right: 34px;
  bottom: 34px;
  width: 90px;
  height: 2px;
  content: "";
  background: var(--blue);
}

.visual-topbar {
  display: flex;
  height: 44px;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
}

.visual-topbar span {
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: rgba(37, 99, 235, 0.2);
}

.visual-topbar span:first-child {
  background: var(--blue);
}

.visual-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 28px 8px;
}

.visual-header span {
  color: var(--quiet);
  font-size: 11px;
  font-weight: 760;
}

.visual-header strong {
  color: var(--muted);
  font-size: 13px;
  font-weight: 640;
}

.brand-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 18px 28px 28px;
}

.brand-card,
.service-card,
.plan-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 12px 36px rgba(37, 99, 235, 0.06);
}

.brand-card {
  display: grid;
  min-height: 122px;
  align-content: center;
  gap: 12px;
  padding: 18px 16px;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-card img {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  object-fit: contain;
}

.brand-card strong {
  color: var(--text);
  font-size: 17px;
  font-weight: 760;
  line-height: 1.25;
}

.brand-card small {
  color: var(--quiet);
  font-size: 12px;
  font-weight: 640;
}

.status-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--blue);
  box-shadow: 0 0 0 5px var(--blue-soft);
}

.problem-section,
.audience-section,
.principle-section {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(420px, 1fr);
  gap: 70px;
  align-items: start;
}

.section-copy h2,
.section-heading h2,
.principle-panel h2,
.contact-shell h2 {
  margin-bottom: 0;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1.05;
  font-weight: 760;
  letter-spacing: 0;
}

.section-copy p,
.contact-shell p {
  max-width: 540px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.75;
}

.problem-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.problem-list li {
  min-height: 56px;
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 16px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.82);
  font-size: 15px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 42px;
}

.section-heading.compact {
  display: block;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.service-card {
  display: grid;
  min-height: 272px;
  align-content: start;
  gap: 28px;
  padding: 22px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.topic-card {
  display: grid;
  min-height: 188px;
  align-content: space-between;
  gap: 22px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 12px 36px rgba(37, 99, 235, 0.06);
}

.topic-card h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.2;
}

.topic-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.topic-card span {
  color: var(--blue);
  font-size: 13px;
  font-weight: 720;
}

.landing-main {
  padding-top: 40px;
}

.landing-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.6fr);
  align-items: center;
  gap: 52px;
  min-height: 520px;
  padding-top: 74px;
  padding-bottom: 74px;
}

.landing-hero h1 {
  max-width: 800px;
  font-size: clamp(42px, 6vw, 76px);
}

.landing-hero p {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.75;
}

.landing-panel {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 28px;
  background:
    linear-gradient(rgba(37, 99, 235, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 145, 178, 0.045) 1px, transparent 1px),
    rgba(255, 255, 255, 0.88);
  background-size: 34px 34px;
  box-shadow: 0 24px 70px rgba(37, 99, 235, 0.11);
}

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

.landing-panel li {
  display: flex;
  min-height: 48px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 14px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.78);
}

.landing-content {
  display: grid;
  grid-template-columns: minmax(0, 0.74fr) minmax(0, 1fr);
  gap: 42px;
  align-items: start;
}

.landing-copy p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.85;
}

.landing-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.landing-card {
  min-height: 190px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 12px 36px rgba(37, 99, 235, 0.06);
}

.landing-card h3 {
  margin-bottom: 14px;
  font-size: 21px;
}

.landing-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.service-index {
  color: var(--blue);
  font-size: 12px;
  font-weight: 780;
}

.service-card h3,
.plan-card h3 {
  margin-bottom: 0;
  font-size: 22px;
  line-height: 1.18;
  font-weight: 730;
  letter-spacing: 0;
}

.service-card ul,
.plan-card ul {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 0;
  color: var(--muted);
  list-style: none;
}

.service-card li,
.plan-card li {
  position: relative;
  padding-left: 16px;
  line-height: 1.5;
}

.service-card li::before,
.plan-card li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 99px;
  content: "";
  background: var(--blue);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 10px;
  margin-top: 34px;
}

.audience-grid span {
  min-height: 76px;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  font-size: 15px;
  font-weight: 620;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.plan-card {
  display: grid;
  min-height: 480px;
  grid-template-rows: auto 1fr auto;
  gap: 32px;
  padding: 30px;
}

.plan-card.highlighted {
  border-color: rgba(37, 99, 235, 0.46);
  background: linear-gradient(180deg, rgba(219, 234, 254, 0.94), rgba(255, 255, 255, 0.92));
}

.plan-label {
  margin-bottom: 14px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 740;
}

.plan-card h3 {
  font-size: clamp(36px, 5vw, 56px);
}

.plan-card h3 span {
  color: var(--quiet);
  font-size: 18px;
  font-weight: 620;
}

.plan-action {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--text);
  font-weight: 700;
}

.plan-action:hover,
.plan-action:focus-visible {
  border-color: rgba(37, 99, 235, 0.34);
  background: rgba(37, 99, 235, 0.08);
}

.principle-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1fr);
  gap: 64px;
  align-items: center;
}

.principle-copy {
  display: grid;
  gap: 14px;
}

.principle-copy p,
.principle-copy strong {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.25;
}

.principle-copy p {
  color: var(--muted);
}

.principle-copy strong {
  color: var(--text);
  font-weight: 760;
}

.faq-list {
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
}

summary {
  cursor: pointer;
  padding: 20px 22px;
  font-size: 17px;
  font-weight: 700;
}

details p {
  margin: 0;
  padding: 0 22px 22px;
  color: var(--muted);
  line-height: 1.7;
}

.contact-section {
  padding-bottom: 96px;
}

.contact-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 24px;
  align-items: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 40px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(219, 234, 254, 0.88));
  box-shadow: 0 24px 70px rgba(37, 99, 235, 0.1);
}

.contact-button {
  white-space: nowrap;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--quiet);
}

.footer-shell {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 13px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 520ms ease,
    transform 520ms ease;
}

@media (max-width: 1080px) {
  .hero,
  .split-section,
  .principle-panel {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 44px;
  }

  .hero-visual {
    max-width: 720px;
  }

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

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

  .landing-hero,
  .landing-content {
    grid-template-columns: 1fr;
  }

  .audience-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .contact-shell {
    grid-template-columns: 1fr;
  }

  .contact-button {
    width: max-content;
  }
}

@media (max-width: 760px) {
  .nav-shell,
  .section-shell {
    width: min(var(--max), calc(100% - 28px));
  }

  .nav-shell {
    grid-template-columns: 1fr auto;
    min-height: 66px;
    gap: 14px;
  }

  .nav-links {
    display: none;
  }

  .nav-cta {
    width: 38px;
    min-height: 36px;
    padding: 0;
    overflow: hidden;
    font-size: 0;
  }

  .nav-cta svg {
    width: 18px;
    height: 18px;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  .hero-copy,
  .hero-subtitle,
  .hero-actions,
  .hero-points,
  .hero-visual {
    width: calc(100vw - 28px);
    max-width: calc(100vw - 28px);
  }

  .section {
    padding: 76px 0;
  }

  h1 {
    max-width: 100%;
    font-size: clamp(38px, 10.8vw, 48px);
    line-height: 1.06;
  }

  .mobile-line-break {
    display: block;
  }

  .hero-subtitle,
  .section-copy p,
  .contact-shell p {
    font-size: 17px;
  }

  .hero-subtitle {
    word-break: break-all;
  }

  .hero-subtitle span {
    display: block;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .brand-wall,
    .problem-list,
    .service-grid,
    .pricing-grid,
    .audience-grid,
    .topic-grid,
    .landing-card-grid {
    grid-template-columns: 1fr;
  }

  .visual-header,
  .brand-wall,
  .status-strip {
    padding-right: 18px;
    padding-left: 18px;
  }

  .visual-header {
    align-items: start;
    flex-direction: column;
    gap: 8px;
  }

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

  .service-card,
  .plan-card {
    min-height: auto;
  }

  .contact-shell {
    padding: 24px;
  }

  .footer-shell {
    align-items: start;
    flex-direction: column;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}