/* =========================================================
 * KEISUKE LP Stylesheet
 * Theme: 濃紺 (#0a2540) + アクセント水色 (#2563eb)
 * Font:  Noto Sans JP (ゴシック)
 * ========================================================= */

:root {
  --c-primary:        #0a2540;  /* 濃紺 */
  --c-primary-dark:   #06182b;
  --c-primary-light:  #14365e;
  --c-accent:         #2563eb;  /* 水色 */
  --c-accent-dark:    #1d4ed8;
  --c-accent-light:   #3b82f6;
  --c-accent-soft:    #dbeafe;

  --c-text:           #0f172a;
  --c-text-muted:     #475569;
  --c-text-light:     #64748b;
  --c-bg:             #ffffff;
  --c-bg-soft:        #f8fafc;
  --c-bg-section:     #f1f5f9;
  --c-border:         #e2e8f0;
  --c-success:        #10b981;
  --c-danger:         #ef4444;

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(10,37,64,.06);
  --shadow:    0 4px 14px rgba(10,37,64,.08);
  --shadow-lg: 0 18px 40px rgba(10,37,64,.14);

  --header-h: 64px;
  --max-w:    1120px;

  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               'Hiragino Kaku Gothic ProN', 'Yu Gothic', Meiryo, sans-serif;
}

/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--c-accent-dark); }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.4; margin: 0; color: var(--c-primary); }

.lp-container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.lp-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color .2s, box-shadow .2s;
}
.lp-header.is-scrolled {
  border-bottom-color: var(--c-border);
  box-shadow: var(--shadow-sm);
}
.lp-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.lp-logo {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 900; font-size: 1.25rem; color: var(--c-primary);
  letter-spacing: .04em;
}
.lp-logo__mark {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--c-primary); color: #fff;
  border-radius: 8px; font-size: 1rem;
}
.lp-logo--light, .lp-logo--light .lp-logo__text { color: #fff; }
.lp-logo--light .lp-logo__mark { background: var(--c-accent); }

.lp-nav { display: flex; align-items: center; gap: 28px; }
.lp-nav__link {
  color: var(--c-text); font-weight: 500; font-size: .95rem;
  position: relative; padding: 4px 0;
}
.lp-nav__link:hover { color: var(--c-accent); }
.lp-nav__link.is-active { color: var(--c-accent); }
.lp-nav__link.is-active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -6px;
  height: 2px; background: var(--c-accent); border-radius: 2px;
}

.lp-nav-toggle {
  display: none;
  width: 40px; height: 40px;
  background: none; border: 0; cursor: pointer; padding: 8px;
}
.lp-nav-toggle span {
  display: block; width: 100%; height: 2px;
  background: var(--c-primary); margin: 5px 0;
  transition: transform .2s, opacity .2s;
}

/* ---------- Buttons ---------- */
.lp-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 700; font-size: 1rem;
  text-decoration: none; border: 0; cursor: pointer;
  transition: transform .15s, box-shadow .2s, background .2s, color .2s;
  white-space: nowrap;
  font-family: inherit;
}
.lp-btn--sm { padding: 8px 16px; font-size: .9rem; }
.lp-btn--lg { padding: 18px 36px; font-size: 1.1rem; }

.lp-btn--primary {
  background: var(--c-accent); color: #fff;
  box-shadow: 0 6px 16px rgba(37,99,235,.32);
}
.lp-btn--primary:hover { background: var(--c-accent-dark); color: #fff; transform: translateY(-1px); }

.lp-btn--secondary {
  background: var(--c-primary); color: #fff;
}
.lp-btn--secondary:hover { background: var(--c-primary-light); color: #fff; }

.lp-btn--ghost {
  background: transparent; color: var(--c-primary);
  border: 1.5px solid var(--c-border);
}
.lp-btn--ghost:hover { border-color: var(--c-accent); color: var(--c-accent); }

.lp-btn--light {
  background: #fff; color: var(--c-accent);
}
.lp-btn--light:hover { background: var(--c-accent-soft); color: var(--c-accent-dark); }

/* ---------- Main ---------- */
.lp-main { padding-top: var(--header-h); }

/* ---------- Section common ---------- */
.lp-section { padding: 96px 0; }
.lp-section--soft { background: var(--c-bg-soft); }
.lp-section--dark {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-light) 100%);
  color: #fff;
}
.lp-section--dark h2, .lp-section--dark h3 { color: #fff; }

.lp-section__head { text-align: center; margin-bottom: 56px; }
.lp-section__eyebrow {
  display: inline-block;
  font-size: .85rem; font-weight: 700; letter-spacing: .15em;
  color: var(--c-accent); text-transform: uppercase;
  margin-bottom: 12px;
}
.lp-section__title {
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  margin-bottom: 16px;
}
.lp-section__lead {
  font-size: 1.05rem; color: var(--c-text-muted);
  max-width: 680px; margin: 0 auto;
}

/* ---------- Hero ---------- */
.lp-hero {
  position: relative;
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(37,99,235,.28), transparent 60%),
    radial-gradient(800px 500px at -10% 110%, rgba(59,130,246,.22), transparent 60%),
    linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%);
  color: #fff;
  padding: 120px 0 100px;
  overflow: hidden;
}
.lp-hero__inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 56px;
  align-items: center;
}
.lp-hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  font-size: .85rem; font-weight: 500; color: #cbd5e1;
  margin-bottom: 24px;
}
.lp-hero__title {
  color: #fff;
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 900;
  letter-spacing: .01em;
  margin-bottom: 24px;
}
.lp-hero__title em {
  font-style: normal;
  color: var(--c-accent-light);
  background: linear-gradient(90deg, #60a5fa, #93c5fd);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.lp-hero__lead {
  font-size: 1.1rem;
  color: #cbd5e1;
  margin-bottom: 36px;
  max-width: 520px;
}
.lp-hero__cta { display: flex; flex-wrap: wrap; gap: 14px; }
.lp-hero__note {
  margin-top: 20px; font-size: .85rem; color: #94a3b8;
}
.lp-hero__note i { color: var(--c-accent-light); margin-right: 4px; }

.lp-hero__visual {
  position: relative;
  aspect-ratio: 4 / 3;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.lp-hero__visual::before {
  content: '';
  position: absolute; inset: 16px;
  background:
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,0)),
    repeating-linear-gradient(
      0deg,
      rgba(255,255,255,.04) 0 28px,
      transparent 28px 56px
    );
  border-radius: var(--radius);
}
.lp-hero__visual-icon {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 6rem; color: rgba(255,255,255,.18);
}

/* ---------- Problem ---------- */
.lp-problems {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.lp-problem {
  padding: 28px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  text-align: left;
}
.lp-problem__icon {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  background: #fee2e2; color: var(--c-danger);
  border-radius: 10px; font-size: 1.25rem;
  margin-bottom: 14px;
}
.lp-problem__title {
  font-size: 1.05rem; margin-bottom: 8px;
}
.lp-problem__text {
  color: var(--c-text-muted); font-size: .95rem; margin: 0;
}

/* ---------- Features ---------- */
.lp-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.lp-feature {
  padding: 32px 28px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.lp-feature:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-accent-soft);
}
.lp-feature__icon {
  width: 56px; height: 56px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--c-accent-soft); color: var(--c-accent);
  border-radius: 12px; font-size: 1.5rem;
  margin-bottom: 18px;
}
.lp-feature__title { font-size: 1.15rem; margin-bottom: 10px; }
.lp-feature__text { color: var(--c-text-muted); font-size: .95rem; margin: 0; }

/* ---------- Flow ---------- */
.lp-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: flow;
}
.lp-flow__step {
  position: relative;
  padding: 32px 24px 28px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  counter-increment: flow;
}
.lp-flow__step::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute; top: -16px; left: 24px;
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--c-accent); color: #fff;
  border-radius: 10px; font-weight: 900; font-size: 1rem;
  box-shadow: 0 6px 14px rgba(37,99,235,.3);
}
.lp-flow__title { margin: 14px 0 8px; font-size: 1.05rem; }
.lp-flow__text  { color: var(--c-text-muted); font-size: .9rem; margin: 0; }

/* ---------- Pricing ---------- */
.lp-pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}
.lp-plan {
  display: flex; flex-direction: column;
  padding: 36px 28px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
  position: relative;
}
.lp-plan--featured {
  border: 2px solid var(--c-accent);
  box-shadow: 0 18px 40px rgba(37,99,235,.18);
  transform: translateY(-8px);
}
.lp-plan__badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--c-accent); color: #fff;
  font-size: .8rem; font-weight: 700; letter-spacing: .08em;
  padding: 4px 14px; border-radius: 999px;
}
.lp-plan__name { font-size: 1.1rem; color: var(--c-text-muted); font-weight: 700; }
.lp-plan__price {
  margin: 12px 0 6px;
  font-size: 2.4rem; font-weight: 900; color: var(--c-primary);
}
.lp-plan__price small { font-size: .9rem; color: var(--c-text-light); font-weight: 500; }
.lp-plan__note { color: var(--c-text-muted); font-size: .9rem; margin-bottom: 24px; }
.lp-plan__list {
  list-style: none; padding: 0; margin: 0 0 28px;
  display: flex; flex-direction: column; gap: 10px;
  flex-grow: 1;
}
.lp-plan__list li {
  display: flex; gap: 10px;
  font-size: .95rem; color: var(--c-text);
}
.lp-plan__list i { color: var(--c-accent); margin-top: 5px; }

/* ---------- FAQ ---------- */
.lp-faq { max-width: 800px; margin: 0 auto; }
.lp-faq__item {
  border: 1px solid var(--c-border);
  background: #fff;
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.lp-faq__q {
  width: 100%;
  display: flex; align-items: center; gap: 14px;
  padding: 20px 24px;
  background: none; border: 0; cursor: pointer;
  font-family: inherit;
  font-size: 1.02rem; font-weight: 700; color: var(--c-primary);
  text-align: left;
}
.lp-faq__q i.fa-chevron-down {
  margin-left: auto; color: var(--c-accent);
  transition: transform .2s;
}
.lp-faq__item.is-open .lp-faq__q i.fa-chevron-down { transform: rotate(180deg); }
.lp-faq__q-mark {
  width: 28px; height: 28px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--c-accent-soft); color: var(--c-accent);
  border-radius: 6px; font-weight: 900; flex-shrink: 0;
}
.lp-faq__a {
  display: none;
  padding: 0 24px 20px 66px;
  color: var(--c-text-muted);
}
.lp-faq__item.is-open .lp-faq__a { display: block; }

/* ---------- Contact form ---------- */
.lp-contact-wrap {
  max-width: 720px; margin: 0 auto;
  background: #fff;
  padding: 48px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
.lp-form { display: flex; flex-direction: column; gap: 20px; }
.lp-form__row { display: flex; flex-direction: column; gap: 8px; }
.lp-form__row--2col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.lp-form__label {
  font-weight: 700; font-size: .95rem; color: var(--c-primary);
  display: flex; align-items: center; gap: 8px;
}
.lp-form__required {
  font-size: .7rem; font-weight: 700;
  background: var(--c-danger); color: #fff;
  padding: 2px 8px; border-radius: 4px;
}
.lp-form__optional {
  font-size: .7rem; font-weight: 700;
  background: var(--c-border); color: var(--c-text-muted);
  padding: 2px 8px; border-radius: 4px;
}
.lp-form__input,
.lp-form__textarea,
.lp-form__select {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--c-text);
  background: #fff;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-sm);
  transition: border-color .15s, box-shadow .15s;
}
.lp-form__input:focus,
.lp-form__textarea:focus,
.lp-form__select:focus {
  outline: 0;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.18);
}
.lp-form__textarea { min-height: 140px; resize: vertical; }
.lp-form__error {
  font-size: .85rem; color: var(--c-danger); margin-top: 4px;
}
.lp-form__consent {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: .9rem; color: var(--c-text-muted);
}
.lp-form__consent input { margin-top: 4px; }

.lp-form__submit { align-self: center; min-width: 240px; }

/* Alerts */
.lp-alert {
  padding: 16px 20px;
  border-radius: var(--radius);
  font-size: .95rem;
  margin-bottom: 24px;
  display: flex; align-items: center; gap: 10px;
}
.lp-alert--success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.lp-alert--error   { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* Honeypot */
.lp-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ---------- Footer ---------- */
.lp-footer {
  background: var(--c-primary-dark);
  color: #cbd5e1;
  padding: 56px 0 32px;
}
.lp-footer__inner {
  display: flex; flex-direction: column; gap: 32px; align-items: center;
  text-align: center;
}
.lp-footer__tagline { color: #94a3b8; margin: 8px 0 0; font-size: .9rem; }
.lp-footer__nav { display: flex; gap: 28px; flex-wrap: wrap; justify-content: center; }
.lp-footer__nav a { color: #cbd5e1; font-size: .9rem; }
.lp-footer__nav a:hover { color: #fff; }
.lp-footer__copy { font-size: .8rem; color: #64748b; margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .lp-hero { padding: 96px 0 72px; }
  .lp-hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .lp-hero__visual { max-width: 520px; margin: 0 auto; }
  .lp-features, .lp-pricing { grid-template-columns: repeat(2, 1fr); }
  .lp-flow      { grid-template-columns: repeat(2, 1fr); }
  .lp-problems  { grid-template-columns: 1fr; }
  .lp-plan--featured { transform: none; }
}

@media (max-width: 720px) {
  .lp-section { padding: 72px 0; }
  .lp-nav { display: none; }
  .lp-nav.is-open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: #fff;
    padding: 16px 24px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow);
  }
  .lp-nav.is-open .lp-nav__link {
    padding: 12px 4px;
    border-bottom: 1px solid var(--c-border);
    width: 100%;
  }
  .lp-nav.is-open .lp-btn { margin-top: 8px; align-self: flex-start; }
  .lp-nav-toggle { display: block; }

  .lp-features, .lp-pricing, .lp-flow { grid-template-columns: 1fr; }
  .lp-form__row--2col { grid-template-columns: 1fr; }
  .lp-contact-wrap { padding: 28px 20px; }
  .lp-hero__cta .lp-btn { width: 100%; }
}