:root {
  --primary-color: #667eea;
  --primary-dark: #5a6fd8;
  --secondary-color: #764ba2;
  --accent-color: #3498db;
  --success-color: #2ecc71;
  --text-primary: #2c3e50;
  --text-secondary: #555;
  --text-light: #666;
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-accent: #e8f4f8;
  --border-light: #e9ecef;
  --border-primary: #ecf0f1;
  --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.05);
  --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.15);
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter",
    "SF Pro Display", Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
  padding: 20px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.container {
  max-width: 900px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-heavy);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  overflow: hidden;
  transition: transform var(--transition-medium),
    box-shadow var(--transition-medium);
}

.container:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.top-page .container {
  max-width: 600px;
  padding: 80px 60px;
  text-align: center;
}

.header {
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--secondary-color) 100%
  );
  color: white;
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 2px,
    rgba(255, 255, 255, 0.05) 2px,
    rgba(255, 255, 255, 0.05) 4px
  );
  animation: shimmer 20s linear infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%) translateY(-100%) rotate(45deg);
  }
  100% {
    transform: translateX(100%) translateY(100%) rotate(45deg);
  }
}

.app-title,
.policy-title,
.main-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 15px;
  font-weight: 300;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.main-title {
  color: var(--text-primary);
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}

.app-subtitle,
.subtitle {
  font-size: clamp(1rem, 3vw, 1.3rem);
  opacity: 0.9;
  font-weight: 400;
}

.subtitle {
  color: var(--text-light);
  margin-bottom: 50px;
}

.content {
  padding: 50px;
}

.section {
  margin-bottom: 50px;
  opacity: 0;
  transform: translateY(20px);
  animation: slideUp 0.6s ease forwards;
}

.section:nth-child(2) {
  animation-delay: 0.1s;
}
.section:nth-child(3) {
  animation-delay: 0.2s;
}
.section:nth-child(4) {
  animation-delay: 0.3s;
}

@keyframes slideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-title {
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  color: var(--text-primary);
  margin-bottom: 25px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--accent-color);
  position: relative;
  font-weight: 600;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 50px;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--secondary-color)
  );
  transition: width var(--transition-medium);
}

.section:hover .section-title::after {
  width: 100px;
}

.app-info {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.8) 0%,
    rgba(248, 249, 250, 0.9) 100%
  );
  padding: 35px;
  border-radius: var(--border-radius-md);
  margin-bottom: 30px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
  transition: all var(--transition-medium);
}

.app-info:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 25px;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.info-item:hover {
  background: rgba(255, 255, 255, 0.9);
  transform: translateX(5px);
  border-color: var(--accent-color);
}

.info-label {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.info-value {
  color: var(--text-primary);
  font-weight: 500;
  padding: 4px 12px;
  background: rgba(102, 126, 234, 0.1);
  border-radius: 20px;
  font-size: 0.9rem;
}

.features-list {
  list-style: none;
  padding: 0;
  margin-top: 25px;
}

.features-list li {
  padding: 12px 0;
  padding-left: 40px;
  position: relative;
  transition: all var(--transition-fast);
  border-radius: var(--border-radius-sm);
  margin: 5px 0;
}

.features-list li::before {
  content: "🐱";
  position: absolute;
  left: 10px;
  font-size: 1.2rem;
  transition: transform var(--transition-fast);
}

.features-list li:hover {
  background: rgba(102, 126, 234, 0.05);
  padding-left: 50px;
}

.features-list li:hover::before {
  transform: scale(1.2) rotate(10deg);
}

.company-info,
.contact-info {
  background: linear-gradient(
    135deg,
    rgba(232, 244, 248, 0.8) 0%,
    rgba(255, 255, 255, 0.9) 100%
  );
  padding: 35px;
  border-radius: var(--border-radius-md);
  margin-top: 30px;
  border: 1px solid rgba(52, 152, 219, 0.2);
  backdrop-filter: blur(10px);
  transition: all var(--transition-medium);
}

.company-info:hover,
.contact-info:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
  border-color: var(--accent-color);
}

.company-info h3,
.contact-info h3 {
  color: var(--text-primary);
  margin-bottom: 20px;
  font-size: 1.3rem;
  font-weight: 600;
}

.company-details {
  line-height: 1.9;
}

.company-details p {
  margin: 8px 0;
  transition: color var(--transition-fast);
}

.company-details p:hover {
  color: var(--primary-color);
}

.app-store-link,
.contact-email {
  display: inline-block;
  background: linear-gradient(135deg, #007aff 0%, #0051d0 100%);
  color: white;
  padding: 15px 30px;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  margin-top: 25px;
  transition: all var(--transition-medium);
  box-shadow: 0 4px 15px rgba(0, 122, 255, 0.3);
  position: relative;
  overflow: hidden;
}

.app-store-link::before,
.contact-email::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left var(--transition-slow);
}

.app-store-link:hover,
.contact-email:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 25px rgba(0, 122, 255, 0.4);
}

.app-store-link:hover::before,
.contact-email:hover::before {
  left: 100%;
}

.contact-section {
  background: linear-gradient(
    135deg,
    rgba(248, 249, 250, 0.9) 0%,
    rgba(255, 255, 255, 0.8) 100%
  );
  padding: 40px;
  border-radius: var(--border-radius-md);
  margin-top: 50px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
  transition: all var(--transition-medium);
}

.contact-section:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
}

.contact-title {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 20px;
  font-weight: 600;
}

.section-content {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.05rem;
}

.section-content ul {
  margin: 20px 0;
  padding-left: 30px;
}

.section-content li {
  margin: 10px 0;
  transition: color var(--transition-fast);
}

.section-content li:hover {
  color: var(--primary-color);
}

.date-info {
  background: linear-gradient(
    135deg,
    rgba(248, 249, 250, 0.8) 0%,
    rgba(233, 236, 239, 0.9) 100%
  );
  padding: 25px;
  border-radius: var(--border-radius-md);
  margin-top: 40px;
  text-align: center;
  color: var(--text-light);
  font-size: 0.95rem;
  border: 1px solid var(--border-light);
  backdrop-filter: blur(5px);
}

/* Katana-gari theme overrides */
body.katana-gari {
  --primary-color: #18233d;
  --primary-dark: #0d1427;
  --secondary-color: #324f43;
  --accent-color: #c9a84f;
  --success-color: #6fa986;
  --text-primary: #221f1b;
  --text-secondary: #4f4638;
  --text-light: #756b5d;
  --bg-primary: #fffaf0;
  --bg-secondary: #f3ead8;
  --bg-accent: #efe3c8;
  --border-light: rgba(58, 43, 24, 0.14);
  --border-primary: rgba(201, 168, 79, 0.34);
  --notice-bg: #f5ead0;
  --notice-border: rgba(201, 168, 79, 0.5);
  --notice-title: #5b3218;
  --notice-text: #3d3227;
  background:
    radial-gradient(circle at 78% 9%, rgba(255, 241, 176, 0.85) 0 58px, rgba(255, 241, 176, 0.2) 59px, transparent 150px),
    linear-gradient(90deg, rgba(34, 69, 55, 0.12) 0 8px, transparent 8px 36px),
    radial-gradient(circle at top left, rgba(45, 66, 104, 0.8), transparent 45%),
    linear-gradient(135deg, #10172b 0%, #24394d 45%, #efe2c1 100%);
  font-family: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--text-primary);
}

body.katana-gari .container {
  background: rgba(255, 250, 240, 0.95);
  border: 1px solid rgba(201, 168, 79, 0.5);
  box-shadow: 0 22px 55px rgba(13, 20, 39, 0.34);
}

body.katana-gari .header {
  background:
    linear-gradient(120deg, rgba(13, 20, 39, 0.92) 0%, rgba(24, 35, 61, 0.88) 56%, rgba(50, 79, 67, 0.92) 100%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.08) 0 2px, transparent 2px 28px);
  color: rgba(255, 250, 240, 0.96);
  border-bottom: 4px solid rgba(201, 168, 79, 0.75);
}

body.katana-gari .header::before {
  background:
    linear-gradient(110deg, transparent 0 44%, rgba(255, 255, 255, 0.24) 45%, transparent 47%),
    repeating-linear-gradient(65deg, rgba(255, 255, 255, 0.09) 0 2px, transparent 2px 11px),
    radial-gradient(circle at 78% 20%, rgba(255, 235, 160, 0.5), transparent 12%);
  animation: shimmer 28s linear infinite;
  opacity: 0.38;
}

body.katana-gari .app-title,
body.katana-gari .policy-title,
body.katana-gari .section-title {
  font-family: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", serif;
  letter-spacing: 0.12em;
  font-weight: 600;
}

body.katana-gari .app-title {
  font-size: clamp(2.6rem, 7vw, 4rem);
  text-shadow: 0 3px 18px rgba(0, 0, 0, 0.45);
}

body.katana-gari .app-subtitle {
  letter-spacing: 0.16em;
  color: rgba(255, 248, 225, 0.9);
  font-size: clamp(0.95rem, 3vw, 1.15rem);
  margin-top: 20px;
}

body.katana-gari .section-title {
  color: var(--primary-dark);
  border-bottom: 2px solid rgba(201, 168, 79, 0.5);
}

body.katana-gari .section-title::after {
  background: linear-gradient(90deg, #8b1f1f, #c9a84f, #324f43);
  height: 4px;
}

body.katana-gari .app-info,
body.katana-gari .recommendation-section {
  background:
    linear-gradient(135deg, rgba(255, 250, 240, 0.94) 0%, rgba(239, 227, 200, 0.82) 100%),
    repeating-linear-gradient(90deg, rgba(201, 168, 79, 0.05) 0 1px, transparent 1px 12px);
  border: 1px solid rgba(201, 168, 79, 0.32);
}

body.katana-gari .app-info:hover,
body.katana-gari .recommendation-section:hover {
  border-color: rgba(139, 31, 31, 0.32);
  box-shadow: 0 12px 30px rgba(24, 35, 61, 0.18);
}

body.katana-gari .description-content h4 {
  font-family: "Shippori Mincho", "Yu Mincho", serif;
  color: var(--primary-dark);
  margin-top: 25px;
  padding-left: 16px;
  border-left: 4px solid rgba(139, 31, 31, 0.78);
}

body.katana-gari .description-content p {
  color: var(--text-secondary);
}

body.katana-gari h3 {
  font-family: "Shippori Mincho", "Yu Mincho", serif;
  color: var(--primary-dark);
  letter-spacing: 0.06em;
}

body.katana-gari .features-list li {
  padding-left: 48px;
  border: 1px solid transparent;
}

body.katana-gari .features-list li::before {
  content: "⚔️";
}

body.katana-gari .features-list li:hover {
  background: rgba(201, 168, 79, 0.16);
  border-color: rgba(201, 168, 79, 0.35);
}

body.katana-gari .features-list li:hover::before {
  transform: scale(1.12) rotate(-12deg);
}

body.katana-gari .company-info,
body.katana-gari .contact-info {
  background: linear-gradient(135deg, rgba(245, 234, 208, 0.96) 0%, rgba(255, 250, 240, 0.92) 100%);
  border-color: rgba(201, 168, 79, 0.32);
}

body.katana-gari .company-info h3,
body.katana-gari .contact-info h3 {
  color: var(--primary-dark);
  font-family: "Shippori Mincho", "Yu Mincho", serif;
}

body.katana-gari .company-details p:hover {
  color: #8b1f1f;
}

body.katana-gari .site-notice__inner {
  max-width: 860px;
}

@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  .content {
    padding: 30px;
  }

  .top-page .container {
    padding: 50px 30px;
  }

  .header {
    padding: 40px 30px;
  }

  .info-grid {
    grid-template-columns: 1fr;
    gap: 15px;
  }

  .info-item {
    padding: 12px 15px;
  }

  .features-list li {
    padding-left: 35px;
  }

  .company-info,
  .contact-info {
    padding: 25px;
  }

  .contact-section {
    padding: 30px 20px;
  }
}

@media (max-width: 480px) {
  .content {
    padding: 20px;
  }

  .top-page .container {
    padding: 40px 20px;
  }

  .app-store-link,
  .contact-email {
    padding: 12px 24px;
    font-size: 0.95rem;
  }
}

/* ============================
   Global Notice (Reusable)
   ============================ */

/* どのサイトでも色だけ差し替えたい時は、ここを上書きするだけでOK */
:root {
  --notice-bg: #f7d6ff;
  --notice-border: rgba(204, 0, 255, 0.35);
  --notice-title: #70007a;
  --notice-text: #32203a;
  --notice-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.site-notice {
  width: 100%;
  margin: 28px 0 0;
  padding: 0 16px 28px;
}

.site-notice__inner {
  max-width: 860px;
  margin: 0 auto;
  background: var(--notice-bg);
  border: 1px solid var(--notice-border);
  border-radius: 14px;
  box-shadow: var(--notice-shadow);
  padding: 14px 16px;
}

.site-notice__title {
  margin: 0 0 8px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--notice-title);
  font-size: 16px;
  line-height: 1.2;
}

.site-notice__text {
  margin: 0;
  color: var(--notice-text);
  font-size: 14px;
  line-height: 1.7;
  word-break: break-word;
}

/* スマホ微調整 */
@media (max-width: 480px) {
  .site-notice {
    padding: 0 12px 22px;
  }
  .site-notice__inner {
    padding: 12px 14px;
    border-radius: 12px;
  }
  .site-notice__title {
    font-size: 15px;
  }
  .site-notice__text {
    font-size: 13.5px;
  }
}