/* ===========================
   リセット & ベース
=========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-900: #1e3a8a;
  --indigo-600: #4f46e5;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-800);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ===========================
   レイアウト
=========================== */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section--gray {
  background: var(--gray-50);
}

/* ===========================
   ナビゲーション
=========================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-100);
  transition: box-shadow 0.2s;
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--gray-900);
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--blue-600);
}

.btn-nav {
  padding: 8px 20px;
  background: var(--blue-600);
  color: var(--white) !important;
  border-radius: var(--radius-sm);
  font-size: 0.875rem !important;
  font-weight: 600 !important;
  transition: background 0.15s, transform 0.1s !important;
}

.btn-nav:hover {
  background: var(--blue-700) !important;
  transform: translateY(-1px);
}

.nav-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all 0.25s;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 12px 24px 20px;
  border-top: 1px solid var(--gray-100);
  gap: 0;
}

.nav-mobile a {
  padding: 12px 0;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-100);
}

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

/* ===========================
   ヒーロー
=========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 40%, #e0e7ff 100%);
  z-index: 0;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -100px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.12) 0%, transparent 70%);
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.1) 0%, transparent 70%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding-top: 60px;
  padding-bottom: 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--blue-700);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--gray-900);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-accent {
  background: linear-gradient(135deg, var(--blue-600), var(--indigo-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--gray-600);
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  background: var(--blue-600);
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
}

.btn-primary:hover {
  background: var(--blue-700);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  background: var(--white);
  color: var(--blue-600);
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius);
  border: 2px solid var(--blue-200);
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
}

.btn-secondary:hover {
  border-color: var(--blue-400);
  background: var(--blue-50);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--blue-700);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--gray-500);
  font-weight: 500;
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--blue-200);
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--gray-400);
  font-size: 0.75rem;
  z-index: 1;
  animation: fadeInUp 1s ease 1s both;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--gray-300);
  border-bottom: 2px solid var(--gray-300);
  transform: rotate(45deg);
  animation: bounce 1.5s infinite;
}

/* ===========================
   セクションヘッダー
=========================== */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--blue-600);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1rem;
  color: var(--gray-500);
  max-width: 540px;
  margin: 0 auto;
}

/* ===========================
   フロー図
=========================== */
.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.flow-step {
  flex: 1;
  min-width: 220px;
  max-width: 280px;
  text-align: center;
  padding: 40px 28px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-100);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.flow-step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gray-800);
  margin: 16px 0 10px;
}

.flow-step p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.7;
}

.flow-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.flow-icon--blue {
  background: var(--blue-100);
  color: var(--blue-600);
}

.flow-icon--indigo {
  background: #e0e7ff;
  color: var(--indigo-600);
}

.flow-icon--green {
  background: #dcfce7;
  color: var(--green-600);
}

.flow-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

/* ===========================
   ベネフィットカード
=========================== */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.benefit-card {
  padding: 32px 24px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.section--gray .benefit-card {
  background: var(--white);
}

.benefit-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue-200);
}

.benefit-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.benefit-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.benefit-card p {
  font-size: 0.875rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===========================
   料金カード
=========================== */
.pricing-card {
  background: var(--white);
  border: 1px solid var(--blue-200);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 48px;
  box-shadow: var(--shadow-md);
}

.section--gray .pricing-card {
  background: var(--blue-50);
}

.pricing-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 24px;
}

.pricing-table {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.pricing-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--white);
}

.pricing-row:not(:last-child) {
  border-bottom: 1px solid var(--gray-100);
}

.pricing-row:nth-child(even) {
  background: var(--gray-50);
}

.pricing-item {
  font-size: 0.95rem;
  color: var(--gray-700);
  font-weight: 500;
}

.pricing-price {
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue-700);
}

.pricing-unit {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--gray-500);
  margin-left: 2px;
}

.pricing-note {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-top: 16px;
}

/* ===========================
   フォーム
=========================== */
.form-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-lg);
}

.form-card--narrow {
  max-width: 700px;
  margin: 0 auto;
}

.form-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--blue-100);
}

.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
}

.required {
  color: #ef4444;
  font-size: 0.8rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--gray-800);
  background: var(--gray-50);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--blue-400);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #ef4444;
  background: #fef2f2;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.field-error {
  font-size: 0.8rem;
  color: #ef4444;
  min-height: 1.2em;
  display: block;
}

.form-message {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  display: none;
}

.form-message.success {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #15803d;
  display: block;
}

.form-message.error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #dc2626;
  display: block;
}

.btn-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 40px;
  background: var(--blue-600);
  color: var(--white);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
  align-self: flex-start;
  min-width: 160px;
}

.btn-submit:hover:not(:disabled) {
  background: var(--blue-700);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, 0.4);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ===========================
   FAQ
=========================== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s;
}

.faq-item:hover {
  border-color: var(--blue-200);
}

.faq-item[open] {
  border-color: var(--blue-300);
}

.faq-item summary {
  list-style: none;
  padding: 20px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-800);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: background 0.15s, color 0.15s;
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--blue-500);
  flex-shrink: 0;
  line-height: 1;
  transition: transform 0.2s;
}

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

.faq-item summary:hover {
  background: var(--blue-50);
  color: var(--blue-700);
}

.faq-item[open] summary {
  background: var(--blue-50);
  color: var(--blue-800);
}

.faq-item p {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.8;
  border-top: 1px solid var(--blue-100);
  padding-top: 16px;
}

/* ===========================
   フッター
=========================== */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand .nav-logo {
  color: var(--white);
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--gray-400);
}

.footer-nav {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--gray-400);
  transition: color 0.15s;
}

.footer-nav a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  text-align: center;
  padding: 16px 24px;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--gray-500);
}

/* ===========================
   アニメーション
=========================== */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(4px); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   レスポンシブ
=========================== */
@media (max-width: 900px) {
  .flow-arrow {
    display: none;
  }

  .flow {
    flex-direction: column;
    align-items: stretch;
  }

  .flow-step {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .nav-links {
    display: none;
  }

  .nav-menu-btn {
    display: flex;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn-primary, .btn-secondary {
    text-align: center;
    justify-content: center;
    width: 100%;
    max-width: 320px;
  }

  .hero-stats {
    gap: 20px;
  }

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

  .form-card {
    padding: 28px 20px;
  }

  .pricing-card {
    padding: 24px 20px;
  }

  .pricing-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-nav {
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

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

  .section-header {
    margin-bottom: 40px;
  }
}