:root {
  --accent: #12b886;
  --accent-deep: #0ca678;
  --accent2: #1c7ed6;
  --bg0: #ffffff;
  --bg1: #f4faf8;
  --ink: #1b2430;
  --muted: #6b7785;
  --line: #e3ebe8;
  --radius: 14px;
  --max: 1080px;
  --font: "Noto Sans SC", "Segoe UI", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.site-header.is-scrolled {
  border-color: var(--line);
  box-shadow: 0 6px 24px rgba(27, 36, 48, 0.06);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.brand span {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.nav a {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.lang-switch {
  display: inline-flex;
  gap: 0.35rem;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  margin-left: 0.25rem;
}

.lang-switch a {
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.8rem;
}

.lang-switch a[aria-current="true"] {
  background: var(--ink);
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 0;
  background: transparent;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

@media (max-width: 820px) {
  .nav-toggle {
    display: flex;
  }
  .nav {
    display: none;
    position: absolute;
    inset: 64px 1rem auto;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.85rem;
    box-shadow: 0 12px 40px rgba(27, 36, 48, 0.1);
  }
  .nav.is-open {
    display: flex;
  }
  .lang-switch {
    margin: 0.35rem 0 0;
    align-self: flex-start;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.72rem 1.25rem;
  border-radius: 999px;
  font-weight: 700;
  border: 0;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  box-shadow: 0 10px 24px rgba(18, 184, 134, 0.28);
}

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

.hero {
  padding: 4rem 0 3.5rem;
  background:
    radial-gradient(circle at 12% 18%, rgba(18, 184, 134, 0.16), transparent 42%),
    radial-gradient(circle at 88% 10%, rgba(28, 126, 214, 0.14), transparent 40%),
    linear-gradient(180deg, #f7fffc 0%, #fff 70%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

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

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero-lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-visual {
  position: relative;
}

.hero-shot {
  width: 100%;
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(27, 36, 48, 0.14);
}

.section {
  padding: 3.5rem 0;
}

.section.alt {
  background: var(--bg1);
}

.section-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
}

.section-lead {
  margin: 0 0 2rem;
  color: var(--muted);
}

.scenario-grid,
.feature-grid,
.dl-platform-grid,
.card-grid {
  display: grid;
  gap: 1rem;
}

.scenario-grid {
  grid-template-columns: repeat(4, 1fr);
}

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

.dl-platform-grid {
  grid-template-columns: repeat(2, 1fr);
}

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

@media (max-width: 900px) {
  .scenario-grid,
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .scenario-grid,
  .feature-grid,
  .dl-platform-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }
}

.scenario-card,
.feature-card,
.dl-card,
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 1.25rem 1.2rem;
}

.scenario-card h3,
.feature-card h3,
.dl-card h2 {
  margin: 0.65rem 0 0.4rem;
  font-size: 1.1rem;
}

.scenario-card p,
.feature-card p,
.dl-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.feature-icon,
.dl-card-icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.dl-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.dl-card .btn {
  align-self: flex-start;
  margin-top: 0.55rem;
}

.dl-sub {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.dl-sub a {
  font-size: 0.85rem;
  color: var(--accent2);
  text-decoration: underline;
}

.page-hero {
  padding: 2.5rem 0 1.5rem;
  background: linear-gradient(180deg, #f4faf8, #fff);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  margin: 0 0 0.5rem;
}

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

.content {
  padding: 2rem 0 3.5rem;
}

.card {
  display: block;
  transition: transform 0.15s, box-shadow 0.15s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(27, 36, 48, 0.08);
}

.card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
}

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

.article h1 {
  margin: 0 0 1rem;
}

.article-body p {
  margin: 0 0 1rem;
}

.faq-list {
  display: grid;
  gap: 0.85rem;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  background: #fff;
}

.faq-item h2 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

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

.breadcrumbs {
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.crumb-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-height: 48px;
  font-size: 0.9rem;
}

.crumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--muted);
}

.crumb-sep {
  list-style: none;
  color: #c0c8d0;
}

.crumb-back {
  color: var(--accent2);
  white-space: nowrap;
}

.site-footer {
  background: #15202b;
  color: rgba(255, 255, 255, 0.78);
  padding: 2.75rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 700px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.site-footer h3 {
  margin: 0 0 0.75rem;
  color: #fff;
  font-size: 0.95rem;
}

.site-footer a {
  display: block;
  margin: 0.35rem 0;
  color: rgba(255, 255, 255, 0.72);
}

.site-footer a:hover {
  color: #fff;
}

.footer-note {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.55;
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copy {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.ios-video {
  margin: 0 0 1.5rem;
}

.ios-video h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
}

.ios-video video {
  display: block;
  width: 100%;
  max-width: 180px;
  height: auto;
  border-radius: var(--radius);
  background: #0b1220;
  transition: max-width 0.25s ease;
  cursor: pointer;
}

.ios-video.is-playing video {
  max-width: min(100%, 420px);
}