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

html { scroll-behavior: smooth; }

body {
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #333;
  background: #f9fafb;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img { max-width: 100%; height: auto; display: block; }
a { color: #1a4f7a; text-decoration: none; transition: color 0.2s; }
a:hover { color: #2d6da3; }

/* Focus styles for keyboard accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
label:focus-visible {
  outline: 2px solid #3b82c4;
  outline-offset: 2px;
  border-radius: 4px;
}

/* Container */
.container { max-width: 960px; margin: 0 auto; padding: 0 1.5rem; }

/* ========== Header ========== */
header {
  background: rgba(26, 79, 122, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: #fff;
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
  transition: opacity 0.2s;
}
.logo:hover { opacity: 0.85; }
.logo img { width: 36px; height: 36px; border-radius: 8px; }

/* Desktop nav */
nav {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}
nav a {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  position: relative;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
nav a:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
}
nav a.active {
  color: #fff;
  background: rgba(255,255,255,0.15);
}

/* Mobile nav toggle */
.nav-toggle { display: none; }
.nav-toggle-label { display: none; cursor: pointer; }
.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  background: #fff;
  height: 2px;
  width: 24px;
  border-radius: 2px;
  position: relative;
  transition: transform 0.3s, background 0.3s;
}
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  content: '';
  position: absolute;
}
.nav-toggle-label span::before { top: -7px; }
.nav-toggle-label span::after { top: 7px; }

/* ========== Hero Section (Home) ========== */
.hero {
  background: linear-gradient(135deg, #1a4f7a 0%, #2d6da3 50%, #3b82c4 100%);
  color: #fff;
  padding: 5rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 50%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}
@keyframes heroGlow {
  from { transform: translate(0, 0); }
  to { transform: translate(5%, 3%); }
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}
.hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 560px;
  margin: 0 auto 2rem;
  line-height: 1.8;
}
.hero .hero-cta {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.3s, transform 0.3s;
}
.hero .hero-cta:hover {
  background: rgba(255,255,255,0.25);
  transform: translateY(-2px);
}

/* ========== Main ========== */
main { flex: 1; padding: 4rem 0 6rem; }

/* ========== Home: App Grid ========== */
.page-heading {
  text-align: center;
  margin-top: 2rem;
  margin-bottom: 3rem;
  font-size: 1.8rem;
  color: #1a4f7a;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.app-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem 1rem 1.5rem;
  border-radius: 16px;
  background: #fff;
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.app-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
}

.app-card img {
  width: 100px;
  height: 100px;
  object-fit: contain;
  border-radius: 22px;
  margin-bottom: 1rem;
}

.app-card .card-title {
  font-weight: 600;
  color: #1a4f7a;
  font-size: 1rem;
  line-height: 1.4;
}

/* ========== App Detail Page ========== */
.app-hero {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2.5rem;
  padding: 2rem;
  background: #fff;
  border-radius: 16px;
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.app-hero .app-icon {
  width: 120px;
  height: 120px;
  border-radius: 24px;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.app-hero h1 { font-size: 1.8rem; color: #1a4f7a; }

.app-description {
  margin-bottom: 2.5rem;
  padding: 2rem;
  background: #fff;
  border-radius: 16px;
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.app-description h2 {
  font-size: 1.2rem;
  color: #1a4f7a;
  margin: 1.5rem 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid #e8f0fe;
}
.app-description p { margin-bottom: 0.75rem; }
.app-description ul {
  margin: 0.5rem 0 0.75rem 1.5rem;
}
.app-description ul li { margin-bottom: 0.4rem; }

.app-links { margin-bottom: 2rem; }
.app-links a {
  display: inline-block;
  margin-right: 1rem;
  color: #1a4f7a;
  font-weight: 500;
  padding: 0.5rem 1.25rem;
  border: 1px solid #1a4f7a;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}
.app-links a:hover {
  background: #1a4f7a;
  color: #fff;
}

/* Store badges */
.store-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}
.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  background: #111;
  color: #fff;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}
.store-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  color: #fff;
}
.store-badge .badge-label { font-size: 0.55rem; font-weight: 400; opacity: 0.8; display: block; line-height: 1; }
.store-badge .badge-store { display: block; line-height: 1.2; }
.store-badge svg { width: 14px; height: 14px; fill: #fff; flex-shrink: 0; }

/* Screenshots */
.screenshots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.screenshots img {
  border-radius: 12px;
  border: 1px solid #e0e0e0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.3s, box-shadow 0.3s;
}
.screenshots img:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.disclaimer {
  background: #f0f7ff;
  border-left: 3px solid #3b82c4;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.9rem;
  color: #555;
  border-radius: 0 8px 8px 0;
}

/* ========== Contact Page ========== */
.contact-form {
  width: 100%;
  min-height: 800px;
  border: none;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

/* ========== Privacy Policy ========== */
.privacy-content {
  padding: 2rem;
  background: #fff;
  border-radius: 16px;
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.privacy-content h1 {
  font-size: 1.8rem;
  color: #1a4f7a;
  margin-bottom: 1.5rem;
}
.privacy-content h2 {
  font-size: 1.2rem;
  color: #1a4f7a;
  margin: 1.5rem 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid #e8f0fe;
}
.privacy-content p { margin-bottom: 0.75rem; }
.privacy-content ul {
  margin: 0.5rem 0 0.75rem 1.5rem;
}
.privacy-content ul li { margin-bottom: 0.3rem; }
.privacy-content .effective-date {
  font-style: italic;
  color: #666;
}

/* ========== Language ========== */
.lang-ja { display: none; }
html.ja .lang-en { display: none; }
html.ja .lang-ja { display: revert; }

.lang-link {
  cursor: pointer;
  padding: 0.3rem 0.75rem;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 20px;
  font-size: 0.8rem;
  transition: background 0.2s;
}
.lang-link:hover {
  background: rgba(255,255,255,0.1);
}

/* ========== Footer ========== */
footer {
  background: #1a4f7a;
  color: rgba(255,255,255,0.8);
  padding: 3rem 0 2rem;
  margin-top: 5rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}
.footer-nav a {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  padding: 0.3rem 0.75rem;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}
.footer-nav a:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
}

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  width: 100%;
}
.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.5rem;
}
.footer-bottom .lang-link {
  color: rgba(255,255,255,0.7);
}
.footer-bottom .lang-link:hover {
  color: #fff;
}

/* ========== Animations ========== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.page-heading {
  animation: fadeInUp 0.6s ease forwards;
}

.hero h1 { animation: fadeInUp 0.7s ease forwards; }
.hero p { animation: fadeInUp 0.7s 0.15s ease both; }
.hero .hero-cta { animation: fadeInUp 0.7s 0.3s ease both; }

/* Stagger animation for cards */
.app-card:nth-child(1) { transition-delay: 0.05s; }
.app-card:nth-child(2) { transition-delay: 0.15s; }
.app-card:nth-child(3) { transition-delay: 0.25s; }
.app-card:nth-child(4) { transition-delay: 0.35s; }

/* Respect reduced motion preference */
@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; }
  html { scroll-behavior: auto; }
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .header-inner {
    justify-content: center;
  }

  .nav-toggle-label {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 101;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(26, 79, 122, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.35s ease, opacity 0.3s ease;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    z-index: 100;
    padding: 0 1.5rem;
  }
  nav a {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    width: 100%;
    border-radius: 0;
  }
  nav a:hover { background: rgba(255,255,255,0.05); }
  nav a:last-child { border-bottom: none; }

  #nav-toggle:checked ~ nav {
    max-height: 350px;
    opacity: 1;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }

  /* Hamburger X animation */
  #nav-toggle:checked ~ .nav-toggle-label span { background: transparent; }
  #nav-toggle:checked ~ .nav-toggle-label span::before {
    top: 0;
    transform: rotate(45deg);
  }
  #nav-toggle:checked ~ .nav-toggle-label span::after {
    top: 0;
    transform: rotate(-45deg);
  }

  /* Hero */
  .hero { padding: 3.5rem 0 3rem; }
  .hero h1 { font-size: 1.6rem; }
  .hero p { font-size: 0.95rem; }

  /* Grid */
  .app-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }

  /* Screenshots */
  .screenshots {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  .screenshots img { border-radius: 8px; }

  /* App hero */
  .app-hero { flex-direction: column; text-align: center; padding: 1.5rem; }
  .app-hero .app-icon { width: 100px; height: 100px; }
  .app-hero h1 { font-size: 1.4rem; }

  .app-description { padding: 1.5rem; }

  /* Store badges */
  .store-badges { justify-content: center; }

  .page-heading { font-size: 1.4rem; }

  /* Footer */
  .footer-nav { flex-direction: column; align-items: center; }

  /* Privacy */
  .privacy-content { padding: 1.5rem; }
}

@media (max-width: 480px) {
  .app-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
  .store-badges { flex-direction: column; align-items: center; }
}