/* ============================================
   Ayumi Landing Page — Design System & Styles
   ============================================ */

/* --- Google Font --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@300;400;500;600;700;900&display=swap');

/* --- Custom Properties --- */
:root {
  /* Colors — inspired by the sunset hero image */
  --color-bg:            #0e0a1a;
  --color-bg-elevated:   #161228;
  --color-surface:       rgba(255, 255, 255, 0.04);
  --color-surface-hover: rgba(255, 255, 255, 0.08);
  --color-glass:         rgba(255, 255, 255, 0.06);
  --color-glass-border:  rgba(255, 255, 255, 0.10);

  --color-text:          #f0eef5;
  --color-text-muted:    #a098b8;
  --color-text-subtle:   #6e6488;

  --color-accent:        #e8945a;
  --color-accent-soft:   #c97a48;
  --color-accent-glow:   rgba(232, 148, 90, 0.25);

  --color-purple:        #8b6cc1;
  --color-purple-glow:   rgba(139, 108, 193, 0.20);

  --gradient-hero:       linear-gradient(135deg, #1a1030 0%, #2d1b4e 30%, #3d2040 60%, #4a2530 100%);
  --gradient-accent:     linear-gradient(135deg, var(--color-accent), #d4786a, var(--color-purple));
  --gradient-card:       linear-gradient(145deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));

  /* Typography */
  --font-primary: 'Hiragino Mincho ProN', 'Yu Mincho', 'Noto Serif JP', serif;
  --font-size-xs:   0.75rem;
  --font-size-sm:   0.875rem;
  --font-size-base: 1rem;
  --font-size-lg:   1.125rem;
  --font-size-xl:   1.25rem;
  --font-size-2xl:  1.5rem;
  --font-size-3xl:  2rem;
  --font-size-4xl:  2.75rem;
  --font-size-5xl:  3.5rem;
  --font-size-hero: clamp(2.5rem, 6vw, 5rem);

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-xl: 28px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background: linear-gradient(135deg, #0e0a1a 0%, #2d1b4e 50%, #4a2530 100%);
  background-attachment: fixed;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section-label {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: var(--space-3xl);
}

/* --- Scroll Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-lg) 0;
  transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.nav.scrolled {
  background: rgba(14, 10, 26, 0.3);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

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

.nav-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.nav-cta {
  padding: var(--space-sm) var(--space-lg);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text) !important;
  font-weight: 500;
  border-radius: var(--border-radius-xl);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 24px var(--color-accent-glow);
  color: var(--color-text) !important;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg,
      rgba(14, 10, 26, 0.5) 0%,
      rgba(14, 10, 26, 0.3) 40%,
      rgba(14, 10, 26, 0.7) 70%,
      #0e0a1a 100%
    );
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-5xl) var(--space-xl);
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-lg);
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius-xl);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: #ffffff;
  margin-bottom: var(--space-2xl);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

.hero-badge .badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: #ffffff;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.8), 0 1px 3px rgba(0, 0, 0, 0.5);
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--border-radius-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 12px 32px var(--color-accent-glow);
  color: var(--color-text);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  background: var(--color-glass);
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--color-glass-border);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: rgba(255,255,255,0.2);
  color: var(--color-text);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  animation: float 3s ease-in-out infinite;
}

.hero-scroll-indicator .arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg);
  opacity: 0.5;
}

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

/* ============================================
   Features Section
   ============================================ */
.features {
  padding: var(--space-5xl) 0;
  position: relative;
  background: linear-gradient(to bottom, #0e0a1a 0%, rgba(14, 10, 26, 0.5) 10%, rgba(14, 10, 26, 0.5) 90%, #0e0a1a 100%), url('images/features-bg.png') center/cover no-repeat;
}

.features-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.features-header .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  position: relative;
  padding: var(--space-2xl);
  background: var(--gradient-card);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,255,255,0.15);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius-md);
  font-size: 1.4rem;
  margin-bottom: var(--space-lg);
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================
   Screenshots Section
   ============================================ */
.screenshots {
  padding: var(--space-5xl) 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(to bottom, #0e0a1a 0%, rgba(14, 10, 26, 0.5) 10%, rgba(14, 10, 26, 0.5) 90%, #0e0a1a 100%), url('images/ayumi-lp-3.png') center/cover no-repeat;
}

.screenshots-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.screenshots-header .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* Tab Switcher */
.screenshots-tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-3xl);
}

.tab-btn {
  padding: var(--space-sm) var(--space-xl);
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius-xl);
  color: var(--color-text-muted);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.tab-btn.active {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-text);
  border-color: rgba(255, 255, 255, 0.4);
}

/* Screenshot Panels */
.screenshots-panel {
  display: none;
}

.screenshots-panel.active {
  display: block;
}

/* iPhone Showcase */
.iphone-showcase {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: var(--space-2xl);
  padding: 0 var(--space-xl);
}

.iphone-frame {
  position: relative;
  width: 260px;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.iphone-frame:hover {
  transform: translateY(-8px);
}

.iphone-frame.center {
  width: 280px;
  z-index: 2;
}

.iphone-frame img {
  width: 100%;
  border-radius: var(--border-radius-xl);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(255, 255, 255, 0.08);
}

.iphone-frame .caption {
  text-align: center;
  margin-top: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* macOS Showcase */
.mac-showcase {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3xl);
}

.mac-frame {
  max-width: 900px;
  width: 100%;
  transition: transform var(--transition-base);
}

.mac-frame:hover {
  transform: scale(1.01);
}

.mac-frame img {
  width: 100%;
  border-radius: var(--border-radius-lg);
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(255, 255, 255, 0.08);
}

.mac-frame .caption {
  text-align: center;
  margin-top: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.mac-secondary-row {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
}

.mac-secondary-row .mac-frame {
  max-width: 420px;
}

/* ============================================
   Pricing Section
   ============================================ */
.pricing {
  padding: var(--space-5xl) 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(to bottom, #0e0a1a 0%, rgba(14, 10, 26, 0.5) 10%, rgba(14, 10, 26, 0.5) 90%, #0e0a1a 100%), url('images/ayumi-lp-4.png') center/cover no-repeat;
}

.pricing-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.pricing-header .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

.pricing-card-wrapper {
  display: flex;
  justify-content: center;
}

.pricing-card {
  position: relative;
  max-width: 420px;
  width: 100%;
  padding: var(--space-3xl);
  background: var(--gradient-card);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius-xl);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-align: center;
  overflow: hidden;
}

.pricing-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
}

.pricing-plan-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-accent);
}

.pricing-amount {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  margin-bottom: var(--space-xs);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.pricing-period {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: var(--space-2xl);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features .check {
  color: #4ade80;
  font-weight: 600;
  font-size: var(--font-size-base);
  flex-shrink: 0;
}

.pricing-card .btn-primary {
  width: 100%;
  justify-content: center;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-glass-border);
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer-logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
}

.footer-copy {
  font-size: var(--font-size-sm);
  color: var(--color-text-subtle);
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  /* Mobile menu */
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(14, 10, 26, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--space-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    gap: var(--space-lg);
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .hero-description {
    font-size: var(--font-size-base);
  }

  .hero-actions {
    flex-direction: column;
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }

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

  /* iPhone showcase responsive */
  .iphone-showcase {
    flex-direction: column;
    align-items: center;
    gap: var(--space-2xl);
  }

  .iphone-frame,
  .iphone-frame.center {
    width: 220px;
  }

  /* macOS showcase responsive */
  .mac-secondary-row {
    flex-direction: column;
    align-items: center;
  }

  .mac-secondary-row .mac-frame {
    max-width: 100%;
  }

  .pricing-card {
    padding: var(--space-2xl);
  }

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

  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero-content {
    padding: var(--space-4xl) var(--space-md);
  }

  .iphone-frame,
  .iphone-frame.center {
    width: 200px;
  }
}