:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #666666;
  --line: #e5e5e5;
  --card: #fafafa;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--fg); text-decoration: none; border-bottom: 1px solid var(--line); }
a:hover { border-bottom-color: var(--fg); }

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}
.nav .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 18px;
  border: none;
}
.nav .brand img {
  width: 32px;
  height: 32px;
  border-radius: 7px;
}
.nav .links { display: flex; gap: 24px; font-size: 14px; }
.nav .links a { color: var(--muted); border: none; }
.nav .links a:hover { color: var(--fg); }

.hero {
  text-align: center;
  padding: 80px 0 64px;
}
.hero img.logo {
  width: 120px;
  height: 120px;
  border-radius: 26px;
  margin-bottom: 32px;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 64px);
  margin: 0 0 16px;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.hero p.tagline {
  font-size: clamp(18px, 2.4vw, 22px);
  color: var(--muted);
  margin: 0 auto 32px;
  max-width: 540px;
}
.hero .badges {
  display: inline-flex;
  gap: 12px;
  padding: 10px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
}

.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding: 64px 0;
}
@media (max-width: 640px) {
  .features { grid-template-columns: 1fr; }
}
.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
}
.feature h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
}
.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.btn-primary {
  display: inline-block;
  padding: 16px 36px;
  background: var(--fg);
  color: var(--bg);
  border-radius: 12px;
  font-weight: 700;
  font-size: 17px;
  border: none;
  margin: 8px 0 4px;
  letter-spacing: -0.01em;
}
.btn-primary:hover { border: none; background: #333333; }

.steps {
  text-align: left;
  max-width: 520px;
  margin: 48px auto 0;
}
.steps ol {
  padding-left: 24px;
  color: #333333;
  font-size: 16px;
}
.steps li { margin-bottom: 14px; line-height: 1.6; }
.steps li strong { color: var(--fg); font-weight: 600; }

.note {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 32px auto 0;
  max-width: 520px;
  font-size: 14px;
  color: var(--muted);
  text-align: left;
  line-height: 1.6;
}

.form {
  max-width: 360px;
  margin: 32px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.form input[type="password"],
.form input[type="email"],
.form input[type="text"] {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--fg);
  font-family: inherit;
}
.form input:focus { outline: 2px solid var(--fg); outline-offset: -1px; border-color: var(--fg); }
.form .btn-primary { width: 100%; margin: 4px 0 0; }

.message {
  max-width: 420px;
  margin: 24px auto 0;
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 15px;
  text-align: left;
}
.message.error { background: #fff1f0; color: #b91c1c; border: 1px solid #fecaca; }
.message.success { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }

.platform-section {
  padding: 48px 0;
  text-align: center;
  border-top: 1px solid var(--line);
}
.platform-section h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 8px;
}
.platform-section p {
  color: var(--muted);
  margin: 0;
  font-size: 15px;
}

.legal {
  padding: 48px 0 96px;
  max-width: 720px;
}
.legal h1 {
  font-size: 32px;
  font-weight: 800;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.legal .updated {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 40px;
}
.legal h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 40px 0 12px;
}
.legal p, .legal li {
  color: #333333;
  font-size: 15px;
}
.legal ul { padding-left: 20px; }
.legal li { margin-bottom: 6px; }
.legal a { color: #333333; }

.footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
}
.footer .links { display: flex; gap: 20px; }
.footer .links a { color: var(--muted); border: none; }
.footer .links a:hover { color: var(--fg); }
@media (max-width: 540px) {
  .footer { flex-direction: column; gap: 16px; }
}