/* ===========================
   Design Tokens & Variables
   =========================== */
:root {
  /* Colors - Warm, friendly light theme */
  --color-bg: #FAFAFA;
  --color-bg-warm: #FFF8F5;
  --color-surface: #FFFFFF;
  --color-surface-hover: #FFF0EB;
  --color-text: #2D2D3A;
  --color-text-secondary: #6B6B80;
  --color-text-muted: #9B9BAF;

  /* Accent gradients */
  --gradient-primary: linear-gradient(135deg, #FF7170 0%, #FFB987 100%);
  --gradient-secondary: linear-gradient(135deg, #A78BFA 0%, #818CF8 100%);
  --gradient-hero: linear-gradient(160deg, #FFF8F5 0%, #FEF0E7 30%, #F3EAFF 70%, #EEF2FF 100%);
  --gradient-section-alt: linear-gradient(180deg, #FFF8F5 0%, #FAFAFA 100%);

  /* Solid accents */
  --color-primary: #FF7170;
  --color-primary-dark: #E85D5C;
  --color-secondary: #A78BFA;
  --color-accent-warm: #FFB987;
  --color-accent-cool: #818CF8;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 8px 32px rgba(255, 113, 112, 0.15);

  /* Borders */
  --border-light: 1px solid rgba(0, 0, 0, 0.06);
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-xl: 28px;

  /* Typography */
  --font-main: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --section-padding: 100px 0;
  --container-width: 1100px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* ===========================
   Navigation
   =========================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition-smooth);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  padding: 10px 0;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  z-index: 1001;
}

.nav-logo-img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: contain;
}

.nav-logo-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-link {
  padding: 8px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--border-radius-xl);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-surface-hover);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===========================
   Hero
   =========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  overflow: hidden;
}

#particleCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 24px;
  animation: heroFadeIn 1s ease-out;
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

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

/* Hero dual logos */
.hero-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-bottom: 28px;
}

.hero-logo {
  border-radius: var(--border-radius-lg);
  animation: logoFloat 4s ease-in-out infinite;
  object-fit: contain;
}

.hero-logo-bird {
  width: 130px;
  height: 130px;
  animation-delay: 0s;
}

.hero-logo-text-mark {
  width: 100px;
  height: 100px;
  animation-delay: 0.5s;
}

@keyframes logoFloat {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-12px);
  }
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 40px;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: var(--border-radius-xl);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition-spring);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 40px rgba(255, 113, 112, 0.25);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.scroll-indicator {
  width: 28px;
  height: 44px;
  border: 2px solid var(--color-text-muted);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
  opacity: 0.5;
}

.scroll-indicator span {
  width: 4px;
  height: 10px;
  background: var(--color-text-muted);
  border-radius: 2px;
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {

  0%,
  100% {
    transform: translateY(0);
    opacity: 1;
  }

  50% {
    transform: translateY(10px);
    opacity: 0.3;
  }
}

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

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

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(255, 113, 112, 0.08);
  padding: 6px 16px;
  border-radius: var(--border-radius-xl);
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.section-description {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===========================
   About
   =========================== */
.about {
  background: var(--gradient-section-alt);
}

.about-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 28px;
}

.about-card {
  flex: 1;
  min-width: 280px;
  max-width: 360px;
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: 40px 32px;
  text-align: center;
  border: var(--border-light);
  transition: var(--transition-spring);
  position: relative;
  overflow: hidden;
}

.about-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition-smooth);
}

.about-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.about-card:hover::before {
  opacity: 1;
}

.about-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 113, 112, 0.06);
  border-radius: 50%;
  color: var(--color-primary);
  transition: var(--transition-smooth);
}

.about-card:nth-child(2) .about-icon {
  background: rgba(167, 139, 250, 0.08);
  color: var(--color-secondary);
}

.about-card:nth-child(3) .about-icon {
  background: rgba(255, 185, 135, 0.1);
  color: var(--color-accent-warm);
}

.about-card:hover .about-icon {
  transform: scale(1.1);
}

.about-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.about-card p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* ===========================
   Apps
   =========================== */
.apps-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 28px;
  max-width: 700px;
  margin: 0 auto;
}

.app-card {
  flex: 1;
  min-width: 280px;
  max-width: 340px;
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: var(--border-light);
  transition: var(--transition-spring);
  overflow: hidden;
}

.app-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.app-card-inner {
  padding: 40px 32px;
  text-align: center;
}

.app-icon-placeholder {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.app-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.app-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.app-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: var(--border-radius-xl);
  background: var(--gradient-primary);
  color: #fff;
  margin-top: 16px;
}

.app-card-cta {
  border-style: dashed;
  border-color: rgba(167, 139, 250, 0.3);
  background: rgba(167, 139, 250, 0.02);
}

.app-card-cta:hover {
  border-color: var(--color-secondary);
  background: rgba(167, 139, 250, 0.04);
}

/* ===========================
   Videos
   =========================== */
.videos {
  background: var(--gradient-section-alt);
}

.videos-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  max-width: 800px;
  margin: 0 auto;
}

.video-category {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: 48px 36px;
  text-align: center;
  border: var(--border-light);
  transition: var(--transition-spring);
  position: relative;
  overflow: hidden;
}

.video-category:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.video-category-visual {
  width: 100px;
  height: 100px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-smooth);
}

.game-visual {
  background: rgba(255, 113, 112, 0.06);
  color: var(--color-primary);
}

.code-visual {
  background: rgba(167, 139, 250, 0.08);
  color: var(--color-secondary);
}

.video-category:hover .video-category-visual {
  transform: scale(1.08) rotate(3deg);
}

.video-category h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.video-category p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
}

.video-link {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: var(--transition-fast);
}

.video-link:hover {
  color: var(--color-primary-dark);
  transform: translateX(4px);
}

/* ===========================
   Latest Videos (YouTube Feed)
   =========================== */
.latest-videos {
  margin-top: 60px;
  text-align: center;
}

.latest-videos-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 28px;
}

.latest-videos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.video-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-md);
  border: var(--border-light);
  overflow: hidden;
  transition: var(--transition-spring);
  text-align: left;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.video-card-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #f0f0f0;
}

.video-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card:hover .video-card-thumb img {
  transform: scale(1.05);
}

.video-card-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  background: rgba(0, 0, 0, 0.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition-fast);
}

.video-card:hover .video-card-play {
  opacity: 1;
}

.video-card-play svg {
  width: 20px;
  height: 20px;
  fill: #fff;
  margin-left: 2px;
}

.video-card-info {
  padding: 16px;
}

.video-card-title {
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 6px;
}

.video-card-date {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.latest-videos-more {
  margin-top: 32px;
}

/* Loading spinner */
.latest-videos-loading {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 40px 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(255, 113, 112, 0.15);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Videos error / fallback */
.latest-videos-fallback {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px 20px;
}

.latest-videos-fallback p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

/* ===========================
   Contact
   =========================== */
.contact-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 40px;
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: var(--border-light);
  transition: var(--transition-spring);
  min-width: 130px;
}

.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.contact-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-smooth);
}

.youtube-icon {
  background: rgba(255, 0, 0, 0.06);
  color: #FF0000;
}

.twitter-icon {
  background: rgba(0, 0, 0, 0.04);
  color: #1a1a1a;
}

.note-icon {
  background: rgba(65, 179, 73, 0.06);
  color: #41B349;
}

.play-icon {
  background: rgba(52, 168, 83, 0.06);
  color: #34A853;
}

.contact-card:hover .contact-icon {
  transform: scale(1.15);
}

.contact-card span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* ===========================
   Footer
   =========================== */
.footer {
  background: var(--color-surface);
  border-top: var(--border-light);
  padding: 40px 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--color-text-secondary);
}

.footer-logo-img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: contain;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: var(--transition-fast);
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===========================
   Animations (fade-in on scroll)
   =========================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

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

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 80px 24px;
    transition: right var(--transition-smooth);
    box-shadow: -8px 0 30px rgba(0, 0, 0, 0.08);
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-link {
    font-size: 1.1rem;
    padding: 12px 24px;
  }

  .hero-title {
    font-size: 2.6rem;
  }

  .hero-subtitle {
    font-size: 1.15rem;
  }

  .hero-logos {
    gap: 16px;
  }

  .hero-logo-bird {
    width: 90px;
    height: 90px;
  }

  .hero-logo-text-mark {
    width: 70px;
    height: 70px;
  }

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

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

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

  .latest-videos-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 70px 0;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .contact-links {
    gap: 16px;
  }

  .contact-card {
    padding: 24px 28px;
    min-width: 110px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .latest-videos-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.2rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 260px;
    justify-content: center;
  }

  .contact-links {
    gap: 12px;
  }

  .contact-card {
    padding: 20px 16px;
    min-width: 80px;
  }
}