/* =============================================
   Vanu LP — Brand Design System
   Dark-first, cinematic, minimal
   ============================================= */

/* --- Tokens --- */
:root {
  --bg:              #0D0E10;
  --surface:         #1A1B1F;
  --surface-elevated:#242528;
  --border:          #2C2D31;
  --primary:         #F0F0F2;
  --accent:          #5B8DEF;
  --accent-sub:      #9B8BDB;
  --text-primary:    #EDEDF0;
  --text-secondary:  #8A8B91;
  --destructive:     #E05C5C;

  --font-sans: 'Inter', 'Noto Sans JP', system-ui, sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: 0.2s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* --- Utility --- */
.container {
  width: 100%;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 24px;
}
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* =============================================
   Header / Nav
   ============================================= */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  padding-block: 20px;
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}
.site-header.scrolled {
  background: rgba(13, 14, 16, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
}
.logo .v { color: var(--accent); }
.logo .anu { color: var(--text-primary); }

.nav-links {
  display: flex;
  gap: 32px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.nav-links a:hover { color: var(--text-primary); }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: opacity var(--transition);
}
.header-cta:hover { opacity: 0.85; }

/* =============================================
   Hero
   ============================================= */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

/* subtle radial glow behind hero content */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(91, 141, 239, 0.14) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 80% 60%, rgba(155, 139, 219, 0.07) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.hero-eyebrow .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.hero-wordmark {
  font-size: clamp(5rem, 16vw, 10rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 0.9;
}
.hero-wordmark .v {
  color: var(--accent);
  text-shadow: 0 0 60px rgba(91, 141, 239, 0.4), 0 0 120px rgba(91, 141, 239, 0.15);
}
.hero-wordmark .anu { color: var(--text-primary); }

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 300;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  font-style: italic;
}

.hero-sub {
  font-size: clamp(0.9rem, 1.8vw, 1rem);
  color: var(--text-secondary);
  max-width: 480px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: opacity var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-secondary {
  background: var(--surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-badge {
  font-size: 0.7rem;
  font-weight: 400;
  opacity: 0.7;
  letter-spacing: 0.02em;
}

/* scroll hint */
.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  color: var(--text-secondary);
  font-size: 0.75rem;
}
.scroll-hint-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--border));
}

/* =============================================
   Section base
   ============================================= */
.section {
  padding-block: 120px;
}
.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 560px;
}

/* =============================================
   Concept Section
   ============================================= */
.concept {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.concept .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.concept-visual {
  display: flex;
  justify-content: center;
}
.concept-mockup {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 9/19;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 36px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04) inset;
}
/* simulated screen content */
.concept-mockup::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(91,141,239,0.06) 0%, transparent 40%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 60px,
      rgba(255,255,255,0.015) 60px,
      rgba(255,255,255,0.015) 61px
    );
}
.mockup-photos {
  position: absolute;
  inset: 48px 16px 16px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 3px;
}
.mockup-photo {
  border-radius: 4px;
  aspect-ratio: 1;
}
.mockup-photo:nth-child(1)  { background: linear-gradient(135deg, #1e2a3a, #2a3550); }
.mockup-photo:nth-child(2)  { background: linear-gradient(135deg, #1a2230, #3a2a50); }
.mockup-photo:nth-child(3)  { background: linear-gradient(135deg, #2a2015, #3a3020); }
.mockup-photo:nth-child(4)  { background: linear-gradient(135deg, #1e3028, #153025); }
.mockup-photo:nth-child(5)  { background: linear-gradient(135deg, #2a1a30, #1a2540); }
.mockup-photo:nth-child(6)  { background: linear-gradient(135deg, #302018, #1a2518); }
.mockup-photo:nth-child(7)  { background: linear-gradient(135deg, #251530, #151a30); }
.mockup-photo:nth-child(8)  { background: linear-gradient(135deg, #1a2835, #2a1835); }
.mockup-photo:nth-child(9)  { background: linear-gradient(135deg, #303015, #1a2520); }
.mockup-statusbar {
  position: absolute;
  top: 16px;
  inset-inline: 24px;
  height: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.mockup-time {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-secondary);
}
.mockup-notch {
  width: 80px; height: 20px;
  background: #0D0E10;
  border-radius: 0 0 12px 12px;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

/* =============================================
   Features Section
   ============================================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 64px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 36px;
  transition: border-color var(--transition), transform var(--transition);
}
.feature-card:hover {
  border-color: rgba(91, 141, 239, 0.3);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.feature-icon-blue   { background: rgba(91, 141, 239, 0.12); color: var(--accent); }
.feature-icon-purple { background: rgba(155, 139, 219, 0.12); color: var(--accent-sub); }

.feature-title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* =============================================
   Privacy / Philosophy Section
   ============================================= */
.philosophy {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.philosophy .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 48px;
}
.philosophy-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.keyword-pill {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--surface-elevated);
  letter-spacing: 0.04em;
}
.keyword-pill.accent {
  border-color: rgba(91, 141, 239, 0.4);
  color: var(--accent);
  background: rgba(91, 141, 239, 0.08);
}
.keyword-pill.accent-sub {
  border-color: rgba(155, 139, 219, 0.4);
  color: var(--accent-sub);
  background: rgba(155, 139, 219, 0.08);
}

/* =============================================
   Download / CTA Section
   ============================================= */
.download {
  position: relative;
  overflow: hidden;
}
.download::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 50% 50%, rgba(91, 141, 239, 0.08) 0%, transparent 70%);
  pointer-events: none;
}
.download .container {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}
.download-logo {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
}
.download-logo .v {
  color: var(--accent);
  text-shadow: 0 0 40px rgba(91, 141, 239, 0.5);
}
.download-logo .anu { color: var(--text-primary); }

.download .section-title { margin-bottom: 12px; }
.download .section-desc  { text-align: center; margin-inline: auto; }

.coming-soon-note {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

/* =============================================
   Footer
   ============================================= */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 48px;
}
.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-logo {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}
.footer-logo .v { color: var(--accent); }

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}
.footer-links {
  display: flex;
  gap: 24px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}
.footer-links a:hover { color: var(--text-primary); }

/* =============================================
   Divider
   ============================================= */
.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .section { padding-block: 80px; }

  .hero {
    padding-top: 60px;
    min-height: auto;
    padding-bottom: 64px;
  }
  .hero .container { gap: 24px; }
  .scroll-hint { display: none; }

  .section-desc br { display: none; }

  .concept .container {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .concept-visual { order: -1; }
  .concept-mockup { max-width: 240px; }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .philosophy .container { gap: 32px; }

  .site-footer .container {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero { padding-top: 40px; padding-bottom: 48px; }
  .hero .container { gap: 20px; }
  .section { padding-block: 56px; }

  .hero-eyebrow {
    font-size: 0.65rem;
    padding: 5px 12px;
  }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .feature-card { padding: 24px; }

  .concept-mockup { max-width: 200px; }
}