/* ========================================
   AI参謀ラボ LP — Light Clean Design
   Notion/Apple inspired
   ======================================== */

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

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f7f8;
  --color-bg-card: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #6b7280;
  --color-text-tertiary: #9ca3af;
  --color-accent: #2563eb;
  --color-accent-light: #eff6ff;
  --color-accent-dark: #1d4ed8;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  --color-success: #059669;
  --color-success-light: #ecfdf5;
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --font-display: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1120px;
  --section-padding: 120px 0;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--color-accent);
  text-decoration: none;
}

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

/* --- Typography --- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 640px;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* --- Sections --- */
section {
  padding: var(--section-padding);
}

section:nth-child(even) {
  background: var(--color-bg-alt);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
  transition: var(--transition);
}

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

.nav-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--color-accent);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-text);
  border-radius: 999px;
  transition: var(--transition);
}

.nav-cta:hover {
  background: #333;
  color: #fff;
}

/* --- Hero --- */
.hero {
  padding: 160px 0 120px;
  text-align: center;
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(
    circle,
    rgba(37, 99, 235, 0.06) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-light);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: 999px;
  margin-bottom: 32px;
}

.hero-badge::before {
  content: "";
  display: block;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.hero h1 {
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  max-width: 800px;
  margin: 0 auto 24px;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-accent), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  color: #fff;
  background: var(--color-text);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: #333;
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  color: #fff;
}

.btn-secondary {
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-text-tertiary);
  color: var(--color-text);
}

.btn-accent {
  color: #fff;
  background: var(--color-accent);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.btn-accent:hover {
  background: var(--color-accent-dark);
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
  color: #fff;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.0625rem;
}

/* --- Social Proof Bar --- */
.social-proof {
  padding: 48px 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg);
}

.proof-items {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.proof-item {
  text-align: center;
}

.proof-number {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.proof-label {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

/* --- Pain Section --- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pain-card {
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.pain-card:hover {
  border-color: var(--color-text-tertiary);
  box-shadow: var(--shadow-md);
}

.pain-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.pain-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.pain-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Solution Section --- */
.solution-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.solution-text .section-label,
.solution-text .section-title {
  text-align: left;
}

.solution-points {
  list-style: none;
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.solution-points li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.solution-check {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-success-light);
  color: var(--color-success);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 2px;
}

.solution-points li strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 2px;
}

.solution-points li span {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.solution-visual {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 48px;
  position: relative;
}

.solution-visual-inner {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
}

.visual-line {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  font-size: 0.875rem;
  font-family: "SF Mono", "Fira Code", monospace;
  color: var(--color-text-secondary);
}

.visual-line .prompt {
  color: var(--color-accent);
  font-weight: 600;
}

.visual-line .command {
  color: var(--color-text);
}

.visual-output {
  margin-top: 16px;
  padding: 16px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* --- Comparison Table --- */
.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.comparison-table th,
.comparison-table td {
  padding: 16px 24px;
  text-align: left;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--color-border-light);
}

.comparison-table thead th {
  background: var(--color-bg-alt);
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.comparison-table thead th:last-child {
  color: var(--color-accent);
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table .highlight-col {
  background: var(--color-accent-light);
  font-weight: 500;
}

/* --- Steps --- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  counter-reset: step;
}

.step-card {
  position: relative;
  padding: 32px 24px;
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-light);
  border-radius: 50%;
  margin-bottom: 20px;
}

.step-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* --- Curriculum --- */
.curriculum-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.curriculum-item {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 24px 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.curriculum-item:hover {
  border-color: var(--color-text-tertiary);
  box-shadow: var(--shadow-md);
}

.curriculum-number {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 4px 12px;
  border-radius: 999px;
  margin-top: 2px;
}

.curriculum-body h3 {
  font-size: 1.0625rem;
  margin-bottom: 4px;
}

.curriculum-body p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* --- Pricing --- */
.pricing-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.pricing-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 20px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border-radius: 999px;
}

.pricing-price {
  margin: 32px 0 8px;
}

.pricing-price .amount {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.pricing-price .currency {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.pricing-price .tax {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-top: 4px;
}

.pricing-note {
  font-size: 0.875rem;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  margin: 24px 0;
}

.pricing-includes {
  text-align: left;
  list-style: none;
  margin: 32px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pricing-includes li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
}

.pricing-includes li::before {
  content: "\2713";
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-success);
  background: var(--color-success-light);
  border-radius: 50%;
}

.pricing-roi {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.pricing-roi p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.pricing-roi strong {
  color: var(--color-text);
}

.pricing-subsidy {
  margin-top: 24px;
  padding: 16px 20px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.pricing-subsidy p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- FAQ --- */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

.faq-item.active {
  border-color: var(--color-text-tertiary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--color-bg-alt);
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-text-tertiary);
  transition: var(--transition);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* --- Final CTA --- */
.final-cta {
  padding: 120px 0;
  text-align: center;
  background: var(--color-bg);
  position: relative;
}

.final-cta::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(37, 99, 235, 0.04) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.final-cta h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 16px;
}

.final-cta p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border-light);
  background: var(--color-bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--color-text);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --section-padding: 80px 0;
  }

  .hero {
    padding: 120px 0 80px;
  }

  .solution-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .proof-items {
    gap: 32px;
  }

  .pain-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .comparison-table {
    font-size: 0.875rem;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 12px 16px;
  }

  .pricing-card {
    padding: 32px 24px;
  }

  .curriculum-item {
    flex-direction: column;
    gap: 12px;
    padding: 20px 24px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .pain-grid {
    grid-template-columns: 1fr;
  }

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

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

  .btn {
    width: 100%;
  }
}

/* --- Animations (subtle) --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}