:root {
  --ink: #0f2744;
  --muted: #4a6278;
  --brand: #1d6feb;
  --brand-deep: #0b4fbf;
  --sea: #e8f3ff;
  --foam: #f4f9ff;
  --line: rgba(15, 39, 68, 0.1);
  --ok: #0f7a4c;
  --card: rgba(255, 255, 255, 0.78);
  --shadow: 0 18px 50px rgba(15, 39, 68, 0.1);
  --radius: 22px;
  --max: 980px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  background:
    radial-gradient(1200px 600px at 10% -10%, #cfe4ff 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #d7f0ea 0%, transparent 45%),
    linear-gradient(180deg, var(--foam), #eef5fb 40%, #f7fbff 100%);
  min-height: 100vh;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.shell { max-width: var(--max); margin: 0 auto; padding: 20px 20px 72px; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0 18px;
}
.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}
.brand-link img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(29, 111, 235, 0.25);
}
.nav-links { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255,255,255,0.7);
}
.lang-switch button {
  border: 0;
  background: transparent;
  padding: 8px 12px;
  font: inherit;
  cursor: pointer;
  color: var(--muted);
}
.lang-switch button.active {
  background: var(--ink);
  color: #fff;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: center;
  padding: 28px 0 18px;
  min-height: calc(100vh - 120px);
}
.hero-copy h1 {
  margin: 0 0 12px;
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}
.hero-copy .tagline {
  margin: 0 0 18px;
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 34ch;
}
.free-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(15, 122, 76, 0.12);
  color: var(--ok);
  font-weight: 700;
  font-size: 0.92rem;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 14px;
  padding: 14px 18px;
  font-weight: 700;
  border: 1px solid transparent;
  text-decoration: none !important;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
  box-shadow: 0 14px 30px rgba(29, 111, 235, 0.35);
}
.btn-secondary {
  background: rgba(255,255,255,0.8);
  color: var(--ink);
  border-color: var(--line);
}
.hero-visual {
  position: relative;
  min-height: 340px;
  border-radius: 32px;
  background:
    linear-gradient(160deg, rgba(29,111,235,0.95), rgba(14,116,144,0.88)),
    radial-gradient(circle at 30% 20%, rgba(255,255,255,0.35), transparent 40%);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: grid;
  place-items: center;
  padding: 28px;
}
.hero-visual img {
  width: min(220px, 58%);
  border-radius: 28%;
  box-shadow: 0 24px 50px rgba(0,0,0,0.28);
}
.hero-visual .glow {
  position: absolute;
  inset: auto -20% -30% auto;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(255,255,255,0.35), transparent 70%);
  pointer-events: none;
}

.section { padding: 42px 0 8px; }
.section h2 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
}
.section .lead {
  margin: 0 0 22px;
  color: var(--muted);
  max-width: 58ch;
}
.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(15, 39, 68, 0.05);
}
.card h3 { margin: 0 0 8px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.98rem; }

.banner {
  margin-top: 36px;
  border-radius: 28px;
  padding: 28px;
  background: linear-gradient(120deg, #0f2744, #16427a 55%, #1d6feb);
  color: #fff;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
}
.banner h2 { margin: 0 0 6px; color: #fff; }
.banner p { margin: 0; color: rgba(255,255,255,0.82); max-width: 42ch; }
.banner .btn-primary {
  background: #fff;
  color: var(--ink);
  box-shadow: none;
}

.page-hero {
  padding: 18px 0 8px;
}
.page-hero h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
}
.page-hero p { margin: 0; color: var(--muted); }

.doc {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}
.doc h2 {
  margin: 28px 0 8px;
  font-size: 1.2rem;
}
.doc h2:first-child { margin-top: 0; }
.doc p, .doc li { color: var(--muted); }
.doc ul { padding-left: 1.2rem; }
.lang-block + .lang-block {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.lang-label {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--sea);
  color: var(--brand-deep);
  font-size: 0.8rem;
  font-weight: 700;
}

.footer {
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  justify-content: space-between;
  font-size: 0.95rem;
}

[data-lang-panel] { display: none; }
[data-lang-panel].active { display: block; }

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-visual { min-height: 280px; order: -1; }
  .grid { grid-template-columns: 1fr; }
}