:root {
  --bg: #f6f7fb;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #fff;
  --text: #0f172a;
  --muted: #475569;
  --border: rgba(15, 23, 42, 0.08);
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
  --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.10);
  --accent: #2563eb;
  --accent-2: #1d4ed8;
  --ring: rgba(37, 99, 235, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  color: var(--text);
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1000px 400px at 10% 0%, rgba(37, 99, 235, 0.18) 0%, rgba(37, 99, 235, 0) 60%),
    radial-gradient(800px 360px at 90% 10%, rgba(29, 78, 216, 0.12) 0%, rgba(29, 78, 216, 0) 58%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 45%, #ffffff 100%);
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 28px 20px;
}

header {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.7);
}

@supports ((-webkit-backdrop-filter: blur(10px)) or (backdrop-filter: blur(10px))) {
  header {
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.55);
  }
}

header .brand {
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--muted);
  font-weight: 700;
}

header .brand .link {
  color: inherit;
}

header .brand .link:hover,
header .brand .link:focus {
  text-decoration: underline;
}

main section {
  margin: 0;
  padding: 64px 0;
}

main.container {
  margin: 18px auto 26px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

main.container > section + section {
  border-top: 1px solid rgba(15, 23, 42, 0.06);
}

main.container > section {
  scroll-margin-top: 88px;
}

h1 {
  font-size: 32px;
  line-height: 1.5;
  margin: 0 0 20px;
  font-weight: 800;
}

h2 {
  font-size: 24px;
  line-height: 1.6;
  margin: 0 0 20px;
  font-weight: 800;
}

h3 {
  font-size: 18px;
  line-height: 1.6;
  margin: 0 0 20px;
  font-weight: 700;
}

p {
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 20px;
}

a {
  color: inherit;
}

ul {
  margin: 0;
  padding-left: 1.2em;
  line-height: 1.8;
  font-size: 16px;
}

.list li {
  margin: 8px 0;
}

.panel {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 30px;
  background: var(--surface-solid);
  box-shadow: var(--shadow-soft);
}

.panel--gray {
  background: rgba(15, 23, 42, 0.04);
  border-color: rgba(15, 23, 42, 0.06);
}

.button {
  display: inline-block;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  padding: 15px 30px;
  text-decoration: none;
  border-radius: 10px;
  margin-top: 18px;
  font-weight: 600;
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.22);
}

.button:hover,
.button:focus {
  filter: brightness(0.96);
}

.note {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
  margin-top: 10px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px;
  background: var(--surface-solid);
  box-shadow: var(--shadow-soft);
}

.price-lead {
  font-size: 18px;
  margin-bottom: 12px;
}

.hero p strong {
  font-weight: 800;
}

.problem {
  text-align: left;
}

.problem p {
  font-size: 18px;
  margin-bottom: 0;
}

.hero {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 64px 32px;
  background:
    radial-gradient(1200px 420px at 20% 0%, rgba(37, 99, 235, 0.10) 0%, rgba(37, 99, 235, 0) 62%),
    radial-gradient(900px 380px at 90% 10%, rgba(29, 78, 216, 0.06) 0%, rgba(29, 78, 216, 0) 60%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.84) 100%);
  box-shadow: var(--shadow-soft);
}

main.container > section.hero {
  margin: 8px 0 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 10px;
}

.box {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 16px;
  background: rgba(255, 255, 255, 0.9);
  font-weight: 700;
}

.form {
  display: grid;
  gap: 14px;
}

label {
  display: block;
  font-size: 14px;
  color: #444;
  margin: 0 0 6px;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  border: 1px solid rgba(15, 23, 42, 0.16);
  border-radius: 12px;
  padding: 12px 12px;
  font-size: 16px;
  line-height: 1.6;
  background: rgba(255, 255, 255, 0.92);
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.55);
  box-shadow: 0 0 0 6px var(--ring);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.error-box {
  border: 1px solid #f1b0b7;
  background: #fff5f5;
  color: #842029;
  padding: 14px 16px;
  border-radius: 14px;
}

.error-box ul {
  margin: 8px 0 0;
}

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

button.button {
  border: 0;
  cursor: pointer;
}

.hp {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.link {
  color: var(--accent);
  text-decoration: none;
}

.link:hover,
.link:focus {
  text-decoration: underline;
}

footer {
  font-size: 12px;
  text-align: center;
  padding: 24px 20px;
  color: rgba(71, 85, 105, 0.9);
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.6);
}

.footer-brand {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.82;
}

@media (max-width: 600px) {
  .container {
    padding: 20px 16px;
  }

  main.container {
    margin: 12px 12px 20px;
  }

  main section {
    padding: 44px 0;
  }

  h1,
  h2 {
    text-wrap: balance;
  }

  .hero h1 br,
  .hero p br,
  .problem p br {
    display: none;
  }

  .hero {
    padding: 36px 18px;
  }

  .panel,
  .card {
    padding: 22px 16px;
  }

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