/* ========================================
   AKスキル研究所 ランディングページ
   デザインコンセプト: 星座の広場
   ======================================== */

/* ----------------------------------------
   CSS変数 - テーマ管理
   ---------------------------------------- */
:root {
  /* ベースカラー（共通） */
  --bg-primary: #0a0e27;
  --bg-secondary: #1a1f3a;
  --bg-card: #12162e;
  --text-primary: #ffffff;
  --text-secondary: #b8b8d4;
  --text-muted: #6b6b8a;

  /* 商品A（性格診断AI）- Rose Gold / Lavender */
  --accent-a-primary: #e8b4b8;
  --accent-a-secondary: #c8b6e2;
  --accent-a-glow: rgba(232, 180, 184, 0.4);

  /* 商品B（執筆AI）- Cyan / Violet */
  --accent-b-primary: #00d9ff;
  --accent-b-secondary: #9d4edd;
  --accent-b-glow: rgba(0, 217, 255, 0.4);

  /* 共通 */
  --gradient-a: linear-gradient(135deg, var(--accent-a-primary), var(--accent-a-secondary));
  --gradient-b: linear-gradient(135deg, var(--accent-b-primary), var(--accent-b-secondary));
  --border-radius: 12px;
  --transition: 0.3s ease;
}

/* ----------------------------------------
   リセット & 基本設定
   ---------------------------------------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ----------------------------------------
   星屑パーティクル背景
   ---------------------------------------- */
.particles-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  animation: twinkle 3s ease-in-out infinite;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.5); }
}

/* ----------------------------------------
   ヘッダー
   ---------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(10, 14, 39, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.1rem;
}

.logo-icon {
  color: var(--accent-b-primary);
  font-size: 1.5rem;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

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

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition);
}

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

.nav-cta {
  background: var(--gradient-a);
  color: var(--bg-primary);
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.nav-cta:hover {
  box-shadow: 0 0 20px var(--accent-a-glow);
  transform: translateY(-2px);
}

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

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* ----------------------------------------
   ヒーローセクション
   ---------------------------------------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 0 80px;
  position: relative;
  z-index: 1;
}

.hero-content {
  text-align: center;
}

.hero-logo {
  margin-bottom: 32px;
}

.constellation-lines {
  width: 120px;
  height: 120px;
}

.constellation-line {
  stroke: var(--accent-b-primary);
  stroke-width: 1;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: drawLine 2s ease forwards;
}

.star-point {
  fill: var(--text-primary);
  animation: fadeInStar 1s ease forwards;
  animation-delay: 1.5s;
  opacity: 0;
}

@keyframes drawLine {
  to { stroke-dashoffset: 0; }
}

@keyframes fadeInStar {
  to { opacity: 1; }
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-b-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 48px;
}

/* 商品カード */
.hero-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto 48px;
}

.product-card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.card-a::before {
  background: var(--gradient-a);
}

.card-b::before {
  background: var(--gradient-b);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
}

.card-a .card-icon {
  color: var(--accent-a-primary);
}

.card-b .card-icon {
  color: var(--accent-b-primary);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.card-features {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-cta {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 8px;
  font-weight: 600;
  transition: all var(--transition);
}

.cta-a {
  background: var(--gradient-a);
  color: var(--bg-primary);
}

.cta-a:hover {
  box-shadow: 0 0 20px var(--accent-a-glow);
}

.cta-b {
  background: var(--gradient-b);
  color: var(--bg-primary);
}

.cta-b:hover {
  box-shadow: 0 0 20px var(--accent-b-glow);
}

/* スクロールインジケーター */
.scroll-indicator {
  animation: bounce 2s ease-in-out infinite;
  color: var(--text-muted);
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(10px); }
}

/* ----------------------------------------
   セクション共通
   ---------------------------------------- */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-family: 'Orbitron', sans-serif;
  color: var(--accent-b-primary);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.section-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.section-content.reverse {
  direction: rtl;
}

.section-content.reverse > * {
  direction: ltr;
}

/* ----------------------------------------
   性格診断AIセクション
   ---------------------------------------- */
.section-diagnosis {
  background: linear-gradient(135deg, rgba(232, 180, 184, 0.05), transparent);
}

.section-diagnosis .section-label {
  color: var(--accent-a-primary);
}

/* デモモックアップ */
.demo-mockup {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.mockup-header {
  display: flex;
  gap: 6px;
  padding: 12px 16px;
  background: var(--bg-primary);
}

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

.dot:first-child { background: #ff5f57; }
.dot:nth-child(2) { background: #febc2e; }
.dot:nth-child(3) { background: #28c840; }

.mockup-content {
  padding: 24px;
}

.demo-question {
  margin-bottom: 20px;
}

.q-number {
  font-size: 0.8rem;
  color: var(--accent-a-primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.q-text {
  font-size: 1rem;
  line-height: 1.6;
}

.demo-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.option {
  padding: 12px 16px;
  background: var(--bg-card);
  border-radius: 8px;
  font-size: 0.9rem;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.option:hover {
  border-color: var(--accent-a-primary);
}

.option.selected {
  background: rgba(232, 180, 184, 0.1);
  border-color: var(--accent-a-primary);
}

.demo-progress {
  height: 4px;
  background: var(--bg-primary);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-a);
  transition: width 0.5s ease;
}

/* 機能リスト */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-check {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--gradient-a);
  color: var(--bg-primary);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.section-diagnosis .feature-check {
  background: var(--gradient-a);
}

.section-writing .feature-check {
  background: var(--gradient-b);
}

.feature-item strong {
  display: block;
  margin-bottom: 4px;
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.section-cta {
  display: inline-block;
  margin-top: 32px;
  padding: 14px 36px;
  border-radius: 8px;
  font-weight: 600;
  transition: all var(--transition);
}

/* ----------------------------------------
   ライトノベル執筆AIセクション
   ---------------------------------------- */
.section-writing {
  background: linear-gradient(135deg, transparent, rgba(0, 217, 255, 0.05));
}

.section-writing .section-label {
  color: var(--accent-b-primary);
}

/* HUDスタイル */
.hud-style {
  border: 1px solid var(--accent-b-primary);
  box-shadow: 0 0 30px var(--accent-b-glow);
}

.hud-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(0, 217, 255, 0.2);
}

.hud-label {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.7rem;
  color: var(--accent-b-primary);
  letter-spacing: 1px;
}

.hud-status {
  font-size: 0.7rem;
  color: #28c840;
  animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hud-panel {
  font-family: 'Orbitron', sans-serif;
}

.hud-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.hud-key {
  font-size: 0.7rem;
  color: var(--accent-b-primary);
  letter-spacing: 1px;
}

.hud-value {
  font-size: 0.85rem;
  color: var(--text-primary);
}

.hud-divider {
  height: 1px;
  background: var(--gradient-b);
  margin: 16px 0;
}

.hud-text {
  font-family: 'Noto Sans JP', sans-serif;
  padding: 16px;
  background: rgba(0, 217, 255, 0.05);
  border-radius: 8px;
  margin-bottom: 16px;
  line-height: 1.8;
}

.hud-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--accent-b-primary);
}

.hud-bar {
  flex: 1;
  height: 4px;
  background: var(--bg-primary);
  border-radius: 2px;
  overflow: hidden;
}

.hud-bar div {
  height: 100%;
  background: var(--accent-b-primary);
  animation: progressPulse 1.5s ease-in-out infinite;
}

@keyframes progressPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ----------------------------------------
   グラデーション過渡セクション
   ---------------------------------------- */
.gradient-transition {
  height: 100px;
  background: linear-gradient(
    180deg,
    rgba(232, 180, 184, 0.1) 0%,
    var(--bg-primary) 50%,
    rgba(0, 217, 255, 0.1) 100%
  );
}

/* ----------------------------------------
   価格セクション
   ---------------------------------------- */
.section-pricing {
  background: var(--bg-secondary);
}

.pricing-tabs {
  display: flex;
  justify-content: center;
  gap: 4px;
  background: var(--bg-primary);
  padding: 4px;
  border-radius: 10px;
  max-width: 400px;
  margin: 0 auto 40px;
}

.pricing-tab {
  flex: 1;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.pricing-tab.active {
  background: var(--gradient-a);
  color: var(--bg-primary);
}

.pricing-tab:hover:not(.active) {
  color: var(--text-primary);
}

.pricing-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  padding: 32px;
  text-align: center;
  position: relative;
  transition: all var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.pricing-card.featured {
  border-color: var(--accent-a-primary);
  transform: scale(1.05);
  box-shadow: 0 0 30px var(--accent-a-glow);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.plan-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-a);
  color: var(--bg-primary);
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.plan-price {
  margin-bottom: 8px;
}

.price {
  font-size: 2.5rem;
  font-weight: 700;
}

.period {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.plan-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.plan-features {
  text-align: left;
  margin-bottom: 24px;
}

.plan-features li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.9rem;
}

.plan-cta {
  width: 100%;
  padding: 14px;
  background: var(--gradient-a);
  color: var(--bg-primary);
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition);
}

.plan-cta:hover {
  box-shadow: 0 0 20px var(--accent-a-glow);
}

.plan-savings {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--accent-a-primary);
}

.pricing-note {
  text-align: center;
  margin-top: 32px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.trial-badge {
  display: inline-block;
  background: rgba(232, 180, 184, 0.1);
  color: var(--accent-a-primary);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-right: 8px;
}

/* ----------------------------------------
   FAQセクション
   ---------------------------------------- */
.section-faq {
  background: var(--bg-primary);
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent-b-primary);
  transition: transform var(--transition);
}

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

.faq-question:hover {
  color: var(--accent-b-primary);
}

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

/* ----------------------------------------
   最終CTAセクション
   ---------------------------------------- */
.section-final-cta {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  text-align: center;
  padding: 120px 0;
}

.final-cta-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-b-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.final-cta-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

.final-cta-button {
  background: var(--gradient-b);
  color: var(--bg-primary);
  padding: 18px 48px;
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  transition: all var(--transition);
}

.final-cta-button:hover {
  box-shadow: 0 0 30px var(--accent-b-glow);
  transform: translateY(-4px);
}

.final-cta-note {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ----------------------------------------
   フッター
   ---------------------------------------- */
.footer {
  background: var(--bg-secondary);
  padding: 60px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-col h4 {
  font-size: 0.9rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

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

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--accent-b-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ----------------------------------------
   アニメーション
   ---------------------------------------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ----------------------------------------
   レスポンシブ
   ---------------------------------------- */
@media (max-width: 1024px) {
  .pricing-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .pricing-card.featured {
    transform: scale(1.02);
  }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero-cards {
    grid-template-columns: 1fr;
  }

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

  .section-content.reverse {
    direction: ltr;
  }

  .pricing-cards {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .pricing-card.featured {
    transform: none;
    order: -1;
  }

  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

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

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

@media (max-width: 480px) {
  .section {
    padding: 60px 0;
  }

  .card-features {
    flex-direction: column;
    gap: 8px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

/* ----------------------------------------
   アクセシビリティ
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* フォーカス状態 */
:focus-visible {
  outline: 2px solid var(--accent-b-primary);
  outline-offset: 2px;
}