:root {
  color-scheme: light;
  --ink: #11141a;
  --muted: #666d76;
  --soft: #8d9299;
  --paper: #f8f7f1;
  --mist: #eef6f4;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: #ffffff;
  --line: #ddd8cb;
  --line-strong: #cfc7b8;
  --aqua: #0f9099;
  --coral: #ef6f4d;
  --leaf: #4d8b66;
  --indigo: #5e63a8;
  --shadow: 0 24px 70px rgba(20, 26, 32, 0.10);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, rgba(15, 144, 153, 0.14), transparent 32%),
    linear-gradient(180deg, #fbfaf6 0%, #f5f4ee 54%, #edf5f3 100%);
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(248, 247, 241, 0.78);
  border-bottom: 1px solid rgba(221, 216, 203, 0.72);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  box-shadow: 0 8px 24px rgba(17, 20, 26, 0.08);
}

.brand-logo {
  width: 30px;
  height: 30px;
  display: block;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  padding: 8px 10px;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
}

.hero {
  min-height: calc(100svh - 130px);
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.88fr);
  gap: clamp(34px, 7vw, 72px);
  align-items: center;
  padding: 52px 0 34px;
}

.hero-copy {
  display: grid;
  gap: 22px;
  max-width: 680px;
}

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

h1 {
  max-width: 680px;
  font-size: clamp(54px, 9vw, 104px);
  line-height: 0.9;
  letter-spacing: 0;
}

.lead {
  max-width: 610px;
  color: var(--muted);
  font-size: clamp(19px, 2.2vw, 23px);
  line-height: 1.45;
}

.hero-actions,
.button-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(17, 20, 26, 0.07);
}

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

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

.mini-proof {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.mini-proof span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.mini-proof span::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--aqua);
}

.app-preview {
  position: relative;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.66);
  box-shadow: var(--shadow);
}

.phone {
  overflow: hidden;
  border: 10px solid #171a21;
  border-radius: 26px;
  background: linear-gradient(180deg, #faf9f3, #eef6f4);
  min-height: 640px;
}

.phone-status {
  display: flex;
  justify-content: space-between;
  padding: 16px 18px 10px;
  color: #30333a;
  font-size: 12px;
  font-weight: 800;
}

.phone-body {
  display: grid;
  gap: 13px;
  padding: 10px 16px 18px;
}

.app-title {
  font-size: 30px;
  line-height: 1;
  font-weight: 900;
}

.app-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.84);
}

.app-card.dark {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.app-card.dark p {
  color: rgba(255, 255, 255, 0.72);
}

.app-card h3 {
  margin-bottom: 6px;
  font-size: 17px;
}

.app-card p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.lesson-row {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
}

.lesson-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  background: rgba(15, 144, 153, 0.13);
}

.lesson-lines {
  flex: 1;
  display: grid;
  gap: 6px;
}

.line {
  height: 8px;
  border-radius: 999px;
  background: #d9d5ca;
}

.line.short {
  width: 64%;
}

.tag-rail {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.tag {
  padding: 6px 9px;
  border-radius: 999px;
  background: rgba(15, 144, 153, 0.12);
  color: var(--aqua);
  font-size: 12px;
  font-weight: 800;
}

.section {
  padding: 62px 0;
}

.section-heading {
  max-width: 760px;
  display: grid;
  gap: 12px;
  margin-bottom: 22px;
}

.section-heading h2 {
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1;
}

.section-heading p,
.doc-lead {
  color: var(--muted);
  font-size: 18px;
}

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

.feature-card,
.doc-card,
.support-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 18px;
}

.feature-card {
  min-height: 190px;
  display: grid;
  align-content: space-between;
  gap: 20px;
}

.feature-card strong,
.support-card strong {
  display: block;
  font-size: 18px;
}

.feature-card p,
.support-card p,
.doc-card p,
.doc-card li {
  color: var(--muted);
}

.icon-box {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--paper);
  font-weight: 900;
}

.split-section {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 16px;
  align-items: stretch;
}

.panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.panel.dark {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.panel.dark p,
.panel.dark li {
  color: rgba(255, 255, 255, 0.72);
}

.list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
}

.list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.list li::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--coral);
}

.path-list {
  display: grid;
  gap: 12px;
}

.path-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.64);
}

.path-number {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(15, 144, 153, 0.13);
  color: var(--aqua);
  font-weight: 900;
}

.path-item p {
  color: var(--muted);
  font-size: 15px;
}

.site-footer {
  margin-top: 46px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--muted);
  font-weight: 800;
  text-decoration: none;
}

.doc-layout {
  display: grid;
  grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
  gap: 28px;
  padding: 46px 0 70px;
}

.doc-side {
  position: sticky;
  top: 92px;
  align-self: start;
  display: grid;
  gap: 12px;
}

.doc-side a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

.doc-main {
  display: grid;
  gap: 16px;
}

.doc-hero {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.doc-hero h1 {
  font-size: clamp(42px, 7vw, 72px);
}

.doc-meta {
  color: var(--aqua);
  font-size: 14px;
  font-weight: 900;
  margin-top: 12px;
}

.doc-card h2 {
  margin-bottom: 10px;
  font-size: 24px;
}

.doc-card ul {
  margin: 10px 0 0;
  padding-left: 22px;
}

.notice {
  border-left: 4px solid var(--coral);
  padding: 14px 16px;
  background: rgba(239, 111, 77, 0.08);
  color: var(--muted);
}

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

@media (max-width: 860px) {
  .hero,
  .split-section,
  .doc-layout {
    grid-template-columns: 1fr;
  }

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

  .app-preview {
    max-width: 420px;
  }

  .phone {
    min-height: 560px;
  }

  .feature-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .doc-side {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .site-shell {
    width: min(100% - 28px, 1120px);
  }

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

  .nav-links {
    justify-content: flex-start;
  }

  h1 {
    font-size: clamp(48px, 18vw, 72px);
  }

  .hero-actions,
  .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .phone {
    border-width: 8px;
    min-height: auto;
  }

  .doc-hero,
  .panel {
    padding: 20px;
  }
}