@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@600;700&family=Noto+Sans+JP:wght@400;500&family=DM+Serif+Display&display=swap');

/* ─── CSS Variables ─────────────────────────────────── */
:root {
  --color-bg: #FAFAF8;
  --color-surface: #FFFFFF;
  --color-primary: #1A2B4A;
  --color-accent: #2E7D6B;
  --color-accent-light: #E8F4F1;
  --color-text: #1C1C1E;
  --color-text-muted: #6B6B6B;
  --color-border: #E8E8E4;
  --color-line-green: #06C755;

  --font-serif: 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --font-en: 'DM Serif Display', serif;

  --radius: 12px;
  --shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.12);

  --max-width: 1140px;
  --section-pad: 80px 0;
  --section-pad-sp: 48px 0;
}

/* ─── Reset & Base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; }

ul, ol { list-style: none; }

/* ─── Container / Section ───────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-pad);
}

.section-label {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.5vw, 38px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 560px;
}

.section-header {
  margin-bottom: 48px;
}

.section-header.center {
  text-align: center;
}

.section-header.center .section-desc {
  margin: 0 auto;
}

/* ─── Navigation ────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
  transition: background 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
  background: var(--color-surface);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-logo img {
  height: 36px;
  width: auto;
}

.nav-logo-text {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-accent);
}

.nav-links a.nav-cta {
  background: var(--color-line-green);
  color: #fff;
  padding: 8px 20px;
  border-radius: 6px;
  font-weight: 700;
  transition: opacity 0.2s, transform 0.2s;
}

.nav-links a.nav-cta:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.nav-external::after {
  content: ' ↗';
  font-size: 11px;
  opacity: 0.6;
}

/* ─── Hamburger (SP) ─────────────────────────────────── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  flex-direction: column;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 16px 24px 24px;
  gap: 4px;
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile a {
  display: block;
  padding: 12px 0;
  font-size: 15px;
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.nav-mobile a:last-child { border-bottom: none; }

/* ─── Buttons ────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-line {
  background: var(--color-line-green);
  color: #fff;
}

.btn-line:hover { opacity: 0.9; }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-lg {
  font-size: 16px;
  padding: 16px 36px;
  border-radius: 10px;
}

/* ─── Card ───────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card-accent {
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-light);
}

/* ─── Hero ───────────────────────────────────────────── */
.hero {
  padding: 100px 0 80px;
  background-color: var(--color-bg);
  overflow: hidden;
  position: relative;
}

.hero-bg-deco {
  position: absolute;
  top: 0; right: 0;
  width: 45%;
  height: 100%;
  pointer-events: none;
  opacity: 0.07;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-en {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 440px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual-box {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, #daf0eb 100%);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

.hero-visual-box img {
  width: 70%;
  height: auto;
}

/* ─── Trust Section ──────────────────────────────────── */
.trust-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.trust-item {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.trust-icon {
  font-size: 28px;
  line-height: 1;
}

.trust-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.6;
}

.trust-text strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

/* ─── Service Cards Grid ─────────────────────────────── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  transition: transform 0.25s, box-shadow 0.25s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.service-card.featured {
  border-left: 4px solid var(--color-accent);
  background: linear-gradient(135deg, var(--color-accent-light) 0%, #fff 60%);
}

.service-card-label {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 400;
}

.service-card-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.service-card-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
  flex: 1;
}

.service-card-link {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s;
  margin-top: 8px;
}

.service-card-link:hover { gap: 8px; }

/* ─── CTA Banner ─────────────────────────────────────── */
.cta-banner {
  background: var(--color-primary);
  padding: 64px 0;
}

.cta-banner-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.cta-banner-en {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}

.cta-banner-title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.cta-banner-sub {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  margin-bottom: 24px;
}

/* ─── Footer ─────────────────────────────────────────── */
.footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.75);
  padding: 48px 0 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand img {
  height: 48px;
  width: auto;
  max-width: 160px;
  margin-bottom: 12px;
  mix-blend-mode: screen;
  opacity: 0.95;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
}

.footer-nav h4,
.footer-contact h4 {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav a {
  font-size: 13px;
  transition: color 0.2s;
}

.footer-nav a:hover { color: #fff; }

.footer-contact p {
  font-size: 13px;
  line-height: 1.8;
}

.footer-contact a {
  color: var(--color-line-green);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 12px;
  color: rgba(255,255,255,0.4);
  text-align: center;
}

/* ─── Sticky Line CTA (L-Flow page) ─────────────────── */
.sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background: var(--color-surface);
  box-shadow: 0 -2px 20px rgba(0,0,0,0.1);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.sticky-cta p {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

/* ─── Steps ──────────────────────────────────────────── */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: var(--color-border);
  z-index: 0;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-num {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 20px;
  margin: 0 auto 16px;
  position: relative;
  z-index: 1;
}

.step-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ─── Pricing Cards ──────────────────────────────────── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  border: 2px solid var(--color-border);
  transition: transform 0.25s, box-shadow 0.25s;
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.pricing-card.featured {
  border-color: var(--color-accent);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  white-space: nowrap;
}

.pricing-plan {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.pricing-price {
  font-family: var(--font-en);
  font-size: 36px;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 4px;
}

.pricing-price span {
  font-size: 36px;
}

.pricing-note {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  flex: 1;
}

.pricing-features li {
  font-size: 13px;
  color: var(--color-text);
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.pricing-features li::before {
  content: '✓';
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.it-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FFF3CD;
  color: #856404;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 20px;
  margin-top: 16px;
  border: 1px solid #FFD70044;
}

/* ─── FAQ Accordion ──────────────────────────────────── */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  gap: 16px;
  user-select: none;
}

.faq-question::after {
  content: '+';
  font-size: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.25s;
  font-weight: 300;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  padding: 0 24px;
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

/* ─── Feature List ───────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-item {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.feature-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ─── Problem Section ────────────────────────────────── */
.problem-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.problem-tag {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
}

.problem-box {
  background: var(--color-primary);
  border-radius: var(--radius);
  padding: 36px 40px;
  color: rgba(255,255,255,0.85);
}

.problem-box-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.problem-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.problem-list li {
  font-size: 15px;
  padding-left: 20px;
  position: relative;
}

.problem-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-line-green);
}

/* ─── Security Box ───────────────────────────────────── */
.security-box {
  background: var(--color-accent-light);
  border: 1px solid #b8ddd7;
  border-radius: var(--radius);
  padding: 32px 40px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.security-icon {
  font-size: 36px;
  flex-shrink: 0;
}

.security-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.security-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 768px) {
  .section { padding: var(--section-pad-sp); }

  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .hero { padding: 64px 0 48px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { display: none; }
  .hero-title { font-size: 26px; }

  .trust-list { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .steps::before { display: none; }
  .pricing-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; gap: 32px; }

  .sticky-cta { flex-direction: column; gap: 8px; text-align: center; }
  .sticky-cta p { font-size: 13px; }

  .security-box { flex-direction: column; gap: 12px; padding: 24px; }
  .problem-box { padding: 24px; }
}

@media (max-width: 480px) {
  .trust-list { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .btn-lg { width: 100%; }
}