:root {
  --color-bg: #fbfbfe;
  --color-surface: #ffffff;
  --color-soft: #f2f3f8;
  --color-text: #1f2330;
  --color-muted: #5d6475;
  --color-border: #d9ddea;
  --color-primary: #5247d5;
  --color-primary-dark: #4238b7;
  --color-error: #b42318;
  --shadow-soft: 0 18px 50px rgba(31, 35, 48, 0.08);
  --container: 1120px;
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-feature-settings: "palt";
  line-height: 1.8;
}

a {
  color: inherit;
}

.container {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px max(16px, calc((100vw - var(--container)) / 2));
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 6px;
  background: var(--color-primary);
  color: #ffffff;
  font-size: 17px;
}

.header-cta {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  padding: 0 14px;
  color: var(--color-primary);
  font-size: 0.86rem;
  font-weight: 700;
  white-space: nowrap;
  text-decoration: none;
}

.header-cta:hover {
  background: var(--color-primary);
  color: #ffffff;
}

.section {
  padding: 88px 0;
}

.section-soft {
  background: var(--color-soft);
}

.hero {
  padding-top: 80px;
  background: var(--color-surface);
}

.hero-grid,
.two-column,
.faq-layout,
.signup-box {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 56px;
  align-items: center;
}

.hero-copy {
  max-width: 650px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
}

.hero-badge {
  display: inline-block;
  margin: 0 0 20px;
  padding: 9px 20px;
  border-radius: 6px;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
}

@media (max-width: 640px) {
  .hero-badge {
    padding: 8px 16px;
    font-size: 0.95rem;
  }
}

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

h1,
h2,
h3 {
  letter-spacing: -0.02em;
  line-height: 1.24;
}

/* 日本語の文節途中での折り返しを防ぐ（外部ライブラリ不使用） */
h1,
h2,
h3,
.hero-sub,
.eyebrow,
summary,
.target-list li,
.signup-points li,
.mock-button {
  word-break: auto-phrase;
  overflow-wrap: anywhere;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(1.75rem, 3.2vw, 2.65rem);
  font-weight: 800;
}

h3 {
  margin-bottom: 12px;
  font-size: 1.22rem;
  font-weight: 800;
}

.lead,
.section-body {
  max-width: 65ch;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.lead {
  margin-bottom: 16px;
  font-size: 1.14rem;
}

.hero-sub {
  max-width: 65ch;
  margin-bottom: 30px;
  font-weight: 700;
}

.note,
.form-note {
  margin: 12px 0 0;
  color: var(--color-muted);
  font-size: 0.86rem;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 6px;
  padding: 0 22px;
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, opacity 160ms ease;
}

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

.button-primary {
  background: var(--color-primary);
  color: #ffffff;
}

.button-primary:hover {
  background: var(--color-primary-dark);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.66;
  transform: none;
}

.hero-panel {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 28px;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.mock-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
}

.mock-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
}

.mock-title {
  margin: 0 0 0 8px;
  color: var(--color-muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.mock-variants {
  display: grid;
  gap: 14px;
}

.mock-variant {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 16px 18px;
}

.mock-label {
  margin: 0 0 10px;
  color: var(--color-muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.mock-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  margin: 0;
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  padding: 0 16px;
  color: var(--color-primary);
  font-weight: 700;
}

.mock-note {
  margin: 20px 0 0;
  color: var(--color-muted);
  font-size: 0.78rem;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.feature-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.9fr);
  gap: 18px;
}

.feature-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 28px;
  background: var(--color-surface);
}

.feature-card-large {
  grid-row: span 2;
  padding: 34px;
}

.feature-kicker {
  margin-bottom: 26px;
  color: var(--color-primary);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.feature-body {
  color: var(--color-muted);
}

.feature-body p,
.section-body p {
  margin-bottom: 1.2em;
}

.feature-body p:last-child,
.section-body p:last-child {
  margin-bottom: 0;
}

.target-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.target-list li {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 18px 20px;
  background: var(--color-surface);
  color: var(--color-muted);
}

.faq-layout {
  align-items: start;
}

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

details {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
}

summary {
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 800;
}

details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--color-muted);
}

.signup-section {
  background: var(--color-text);
  color: #ffffff;
}

.signup-section .eyebrow,
.signup-section .section-body {
  color: #d8d9ff;
}

.signup-box {
  align-items: start;
}

.signup-points {
  display: grid;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  color: #d8d9ff;
}

.signup-points li {
  position: relative;
  padding-left: 20px;
}

.signup-points li::before {
  position: absolute;
  left: 0;
  content: "―";
}

.signup-form {
  display: grid;
  gap: 12px;
  border-radius: 6px;
  padding: 28px;
  background: #ffffff;
  color: var(--color-text);
}

.signup-form label {
  font-weight: 800;
}

.signup-form input,
.survey-form select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0 14px;
  color: var(--color-text);
  font: inherit;
}

.signup-form input:focus,
.survey-form select:focus {
  border-color: var(--color-primary);
  outline: 3px solid rgba(82, 71, 213, 0.14);
}

.hp-field {
  position: absolute;
  left: -9999px;
}

.form-message {
  min-height: 1.6em;
  margin: 0;
  color: var(--color-error);
  font-weight: 700;
}

.site-footer {
  padding: 28px 0;
  background: var(--color-bg);
  color: var(--color-muted);
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
}

.footer-owner,
.footer-copy {
  margin: 0;
}

.footer-copy {
  margin-top: 4px;
  font-size: 0.82rem;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

.utility-page {
  min-height: 100dvh;
  padding: 72px 0;
  background: var(--color-bg);
}

.utility-card {
  max-width: 760px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 34px;
  background: var(--color-surface);
}

.utility-card h1 {
  font-size: clamp(1.9rem, 3.4vw, 2.4rem);
}

.utility-card h2 {
  margin-top: 32px;
  font-size: 1.2rem;
}

.survey-form {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.survey-form label {
  display: grid;
  gap: 8px;
  font-weight: 800;
}

.survey-message {
  min-height: 1.6em;
  margin: 0;
  color: var(--color-muted);
  font-weight: 700;
}

@media (max-width: 760px) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    padding: 10px 16px;
  }

  .header-cta {
    min-height: 36px;
    padding: 0 12px;
    font-size: 0.78rem;
  }

  .brand span:last-child {
    font-size: 0.98rem;
  }

  .section {
    padding: 64px 0;
  }

  .hero {
    padding-top: 54px;
  }

  .hero-grid,
  .two-column,
  .faq-layout,
  .signup-box,
  .feature-grid,
  .target-list {
    grid-template-columns: 1fr;
  }

  .feature-card-large {
    grid-row: auto;
  }

  .footer-inner {
    flex-direction: column;
  }

  .footer-links {
    flex-direction: column;
    gap: 10px;
  }
}