/* ========================
   CSS Variables
   ======================== */
:root {
  --navy: #1a1f3a;
  --navy-dark: #10132a;
  --navy-light: #252b4a;
  --purple: #7B61FF;
  --blue: #4A90E2;
  --purple-glow: rgba(123, 97, 255, 0.25);
  --blue-glow: rgba(74, 144, 226, 0.2);
  --white: #ffffff;
  --white-80: rgba(255,255,255,0.8);
  --white-50: rgba(255,255,255,0.5);
  --white-20: rgba(255,255,255,0.2);
  --white-10: rgba(255,255,255,0.1);
  --white-05: rgba(255,255,255,0.05);
  --text-primary: #ffffff;
  --text-secondary: rgba(255,255,255,0.7);
  --text-muted: rgba(255,255,255,0.45);
  --gradient: linear-gradient(135deg, #7B61FF, #4A90E2);
  --gradient-soft: linear-gradient(135deg, rgba(123,97,255,0.15), rgba(74,144,226,0.15));
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(123,97,255,0.3);
  --font-ja: 'Noto Sans JP', sans-serif;
  --font-en: 'DM Sans', sans-serif;
}

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

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

body {
  background: var(--navy-dark);
  color: var(--text-primary);
  font-family: var(--font-ja);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================
   HERO
   ======================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 80px 0 60px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(123,97,255,0.35) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(74,144,226,0.2) 0%, transparent 60%),
    var(--navy-dark);
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 0;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 40%, transparent 100%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.app-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--white-10);
  border: 1px solid var(--white-20);
  border-radius: 50px;
  padding: 8px 20px 8px 8px;
  margin-bottom: 32px;
  backdrop-filter: blur(12px);
  animation: fadeInDown 0.6s ease both;
}

.app-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.app-label {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(2.4rem, 7vw, 4rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  animation: fadeInUp 0.7s ease 0.1s both;
}

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

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.8;
  animation: fadeInUp 0.7s ease 0.2s both;
}

.cta-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.7s ease 0.3s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.01em;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
  opacity: 0.92;
}

.btn:active {
  transform: translateY(0);
}

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn-ios {
  background: var(--gradient);
  color: white;
  box-shadow: 0 4px 24px rgba(123,97,255,0.45);
}

.btn-ios:hover {
  box-shadow: 0 8px 32px rgba(123,97,255,0.6);
}

.btn-android {
  background: var(--white-10);
  color: white;
  border: 1px solid var(--white-20);
  backdrop-filter: blur(8px);
}

.btn-android:hover {
  background: var(--white-20);
  box-shadow: 0 4px 24px rgba(74,144,226,0.3);
}

.trial-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
  animation: fadeInUp 0.7s ease 0.4s both;
}

/* ========================
   FEATURES
   ======================== */
.features {
  padding: 100px 0;
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 80px;
  background: linear-gradient(to bottom, transparent, var(--white-20));
}

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 56px;
  letter-spacing: -0.02em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--white-05);
  border: 1px solid var(--white-10);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.3s ease, background 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  background: var(--white-10);
  border-color: var(--white-20);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ========================
   SCREENSHOTS
   ======================== */
.screenshots {
  padding: 80px 0;
  background: linear-gradient(180deg, transparent, rgba(123,97,255,0.05) 50%, transparent);
}

.screenshots-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--white-20) transparent;
  padding: 20px 0 24px;
  cursor: grab;
}

.screenshots-scroll:active {
  cursor: grabbing;
}

.screenshots-scroll::-webkit-scrollbar {
  height: 4px;
}

.screenshots-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.screenshots-scroll::-webkit-scrollbar-thumb {
  background: var(--white-20);
  border-radius: 2px;
}

.screenshots-track {
  display: flex;
  gap: 20px;
  padding: 0 24px;
  width: max-content;
}

.screenshot-item {
  flex-shrink: 0;
  width: 240px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card), 0 0 0 1px var(--white-10);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-item:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.screenshot-item img {
  width: 100%;
  height: auto;
  display: block;
}

.scroll-hint {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 16px;
  letter-spacing: 0.05em;
}

/* ========================
   STATS BANNER
   ======================== */
.stats-banner {
  padding: 60px 0;
  border-top: 1px solid var(--white-10);
  border-bottom: 1px solid var(--white-10);
}

.stats-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 40px;
}

.stat-num {
  font-family: var(--font-en);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 6px;
  letter-spacing: 0.03em;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--white-15);
}

/* ========================
   CTA BOTTOM
   ======================== */
.cta-bottom {
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-bottom::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 50% 50%, rgba(123,97,255,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-bottom h2 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-bottom p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 40px;
}

/* ========================
   FOOTER
   ======================== */
.footer {
  padding: 24px 0;
  border-top: 1px solid var(--white-10);
  text-align: center;
}

.footer p {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-en);
}

/* ========================
   Animations
   ======================== */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ========================
   Responsive
   ======================== */
@media (max-width: 640px) {
  .hero {
    padding: 60px 0 48px;
    min-height: auto;
  }

  .cta-group {
    flex-direction: column;
    align-items: stretch;
    padding: 0 20px;
  }

  .btn {
    justify-content: center;
  }

  .stat-divider {
    display: none;
  }

  .stats-grid {
    gap: 8px;
  }

  .stat-item {
    padding: 12px 24px;
  }

  .screenshot-item {
    width: 200px;
  }

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