/* ============================================
   3QBOX — Premium Design System
   Dark Obsidian + Blue-Purple Gradient
   ============================================ */

/* --- Custom Properties --- */
:root {
  --bg-primary: #060912;
  --bg-secondary: #0C1020;
  --bg-card: rgba(255, 255, 255, 0.035);
  --bg-card-hover: rgba(255, 255, 255, 0.06);

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-card: rgba(255, 255, 255, 0.08);

  --text-primary: #EEF2FF;
  --text-secondary: rgba(238, 242, 255, 0.62);
  --text-muted: rgba(238, 242, 255, 0.32);

  --accent-blue: #4F7EFF;
  --accent-purple: #8B5CF6;
  --accent-gold: #F0B429;
  --accent-amber: #F59E0B;
  --accent-emerald: #10B981;
  --accent-rose: #F43F5E;
  --accent-orange: #F97316;
  --accent-teal: #14B8A6;

  --gradient-brand: linear-gradient(135deg, #4F7EFF 0%, #8B5CF6 100%);
  --gradient-gold: linear-gradient(135deg, #F0B429 0%, #F97316 100%);

  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);

  --radius-card: 16px;
  --radius-btn: 100px;

  --font-display: 'Playfair Display', 'Georgia', serif;
  --font-sans: 'Noto Sans JP', 'Hiragino Sans', sans-serif;

  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  --header-height: 72px;
}

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

html { scroll-behavior: smooth; }

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

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

/* Grid texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(79, 126, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 126, 255, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

/* ============================================
   HEADER
   ============================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-height);
  z-index: 100;
  transition: background 0.4s var(--ease-smooth), border-color 0.4s var(--ease-smooth);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(6, 9, 18, 0.88);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom-color: var(--border-subtle);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  width: 36px; height: 36px;
  background: var(--gradient-brand);
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px; letter-spacing: 0;
  color: #fff;
  font-family: var(--font-display);
}

.logo-text {
  font-size: 17px; font-weight: 500; letter-spacing: 0.06em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 13px; font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  transition: color 0.2s;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--gradient-brand);
  transition: width 0.3s var(--ease-smooth);
}

.nav-link:hover { color: var(--text-primary); }
.nav-link:hover::after { width: 100%; }

.nav-cta {
  font-size: 13px; font-weight: 500;
  padding: 8px 20px;
  border-radius: var(--radius-btn);
  background: var(--gradient-brand);
  color: #fff;
  letter-spacing: 0.04em;
  transition: opacity 0.2s, transform 0.2s;
  box-shadow: 0 2px 16px rgba(79, 126, 255, 0.3);
}

.nav-cta:hover { opacity: 0.85; transform: translateY(-1px); }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px; padding: 4px;
  cursor: pointer; background: none; border: none;
}

.menu-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text-primary); border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  padding: var(--header-height) 24px 80px;
}

#hero-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
}

.hero-orbs {
  position: absolute; inset: 0;
  z-index: 0; pointer-events: none;
}

.orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); opacity: 0.14;
  animation: float-orb 10s ease-in-out infinite;
}

.orb-1 {
  width: 560px; height: 560px;
  background: radial-gradient(circle, #4F7EFF, transparent 70%);
  top: -120px; right: -80px; animation-delay: 0s;
}

.orb-2 {
  width: 440px; height: 440px;
  background: radial-gradient(circle, #8B5CF6, transparent 70%);
  bottom: -60px; left: -60px; animation-delay: -4s;
}

.orb-3 {
  width: 320px; height: 320px;
  background: radial-gradient(circle, #F0B429, transparent 70%);
  top: 45%; left: 48%; animation-delay: -7s; opacity: 0.08;
}

@keyframes float-orb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(24px, -28px) scale(1.04); }
  66% { transform: translate(-18px, 18px) scale(0.96); }
}

.hero-content {
  position: relative; z-index: 1;
  text-align: center; max-width: 820px;
}

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11px; font-weight: 500; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent-blue);
  padding: 6px 18px;
  border: 1px solid rgba(79, 126, 255, 0.28);
  border-radius: 100px;
  margin-bottom: 32px;
  opacity: 0;
  animation: fade-up 0.8s var(--ease-smooth) 0.2s forwards;
}

.hero-eyebrow::before {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-blue);
  animation: pulse-dot 2.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.75); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(52px, 9vw, 104px);
  font-weight: 600; line-height: 1.05; letter-spacing: -0.025em;
  margin-bottom: 28px;
  opacity: 0;
  animation: fade-up 0.9s var(--ease-smooth) 0.4s forwards;
}

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

.hero-title .line-jp {
  display: block;
  font-family: var(--font-sans);
  font-size: clamp(15px, 2.2vw, 21px);
  font-weight: 300; letter-spacing: 0.18em;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.hero-description {
  font-size: clamp(14px, 1.8vw, 17px);
  color: var(--text-secondary);
  font-weight: 300; letter-spacing: 0.04em;
  max-width: 540px; margin: 0 auto 52px;
  line-height: 1.9;
  opacity: 0;
  animation: fade-up 0.9s var(--ease-smooth) 0.6s forwards;
}

.hero-cta-group {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
  opacity: 0;
  animation: fade-up 0.9s var(--ease-smooth) 0.8s forwards;
}

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px;
  background: var(--gradient-brand); color: #fff;
  font-size: 14px; font-weight: 500; border-radius: var(--radius-btn);
  letter-spacing: 0.04em;
  transition: transform 0.25s var(--ease-spring), box-shadow 0.25s;
  box-shadow: 0 4px 28px rgba(79, 126, 255, 0.38);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 36px rgba(79, 126, 255, 0.55);
}

.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px;
  background: transparent; color: var(--text-secondary);
  font-size: 14px; font-weight: 400; border-radius: var(--radius-btn);
  border: 1px solid var(--border-card); letter-spacing: 0.04em;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}

.btn-secondary:hover {
  border-color: rgba(255, 255, 255, 0.22);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.hero-scroll-hint {
  position: absolute; bottom: 36px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  opacity: 0;
  animation: fade-in 1s var(--ease-smooth) 1.4s forwards;
}

.scroll-line {
  width: 1px; height: 48px;
  background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.25));
  animation: scroll-pulse 2.4s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(0.65); }
}

.scroll-text {
  font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--text-muted);
}

/* ============================================
   STATS BAND
   ============================================ */
.stats-section {
  position: relative; z-index: 1;
  padding: 72px 24px;
  background: linear-gradient(135deg, rgba(79, 126, 255, 0.05), rgba(139, 92, 246, 0.05));
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.stats-inner {
  max-width: 960px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 32px; text-align: center;
}

.stat-item {
  opacity: 0; transform: translateY(20px);
}

.stat-item.visible {
  animation: fade-up 0.6s var(--ease-smooth) forwards;
}

.stat-number {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px); font-weight: 600;
  background: var(--gradient-brand);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1; margin-bottom: 8px;
}

.stat-label {
  font-size: 13px; color: var(--text-secondary); letter-spacing: 0.06em;
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services-section {
  position: relative; z-index: 1;
  padding: 120px 24px;
  max-width: 1200px; margin: 0 auto;
}

.section-header {
  text-align: center; margin-bottom: 64px;
}

.section-label {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 11px; font-weight: 500; letter-spacing: 0.26em; text-transform: uppercase;
  color: var(--accent-blue); margin-bottom: 20px;
}

.section-label::before, .section-label::after {
  content: ''; display: block;
  height: 1px; width: 28px;
  background: var(--accent-blue); opacity: 0.45;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px); font-weight: 600;
  letter-spacing: -0.02em; line-height: 1.2;
  margin-bottom: 16px;
}

.section-title .jp {
  font-family: var(--font-sans);
  font-size: clamp(13px, 1.8vw, 16px); font-weight: 300;
  letter-spacing: 0.16em; color: var(--text-secondary);
  display: block; margin-bottom: 8px;
}

.section-subtitle {
  font-size: 15px; color: var(--text-secondary);
  max-width: 440px; margin: 0 auto; line-height: 1.8;
}

/* ============================================
   CARDS GRID
   ============================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.cards-grid-4 {
  grid-template-columns: repeat(2, 1fr);
  max-width: 880px; margin: 0 auto;
}

/* Service Card */
.service-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-card);
  overflow: hidden; cursor: pointer;
  transition:
    transform 0.3s var(--ease-spring),
    box-shadow 0.3s,
    border-color 0.3s;
  will-change: transform;

  opacity: 0;
  transform: translateY(28px);
}

.service-card.visible {
  animation: card-enter 0.55s var(--ease-spring) forwards;
}

.service-card:hover {
  box-shadow: var(--shadow-card), 0 0 0 1px var(--card-accent-color, rgba(79,126,255,0.4)), 0 12px 40px rgba(0,0,0,0.7);
  border-color: var(--card-accent-color, rgba(79,126,255,0.4));
  z-index: 2;
}

/* Shimmer highlight on hover */
.service-card::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(
    circle at var(--mx, 50%) var(--my, 50%),
    rgba(255, 255, 255, 0.05),
    transparent 65%
  );
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 0; pointer-events: none;
}

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

/* Top accent bar */
.card-accent-bar {
  height: 3px;
  background: var(--card-accent-color, var(--accent-blue));
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s var(--ease-smooth);
}

.service-card:hover .card-accent-bar { transform: scaleX(1); }

.card-body {
  padding: 28px 28px 24px;
  position: relative; z-index: 1;
}

.card-icon-wrap {
  width: 50px; height: 50px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 22px;
  background: var(--card-icon-bg, rgba(79,126,255,0.12));
  transition: transform 0.3s var(--ease-spring);
}

.service-card:hover .card-icon-wrap {
  transform: scale(1.1) rotate(-4deg);
}

.card-category {
  font-size: 10px; font-weight: 500; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--card-accent-color, var(--accent-blue));
  margin-bottom: 10px;
  display: flex; align-items: center; gap: 7px;
}

.card-category::before {
  content: ''; width: 14px; height: 1px;
  background: currentColor; opacity: 0.55;
}

.card-name {
  font-size: 20px; font-weight: 500; letter-spacing: 0.02em;
  margin-bottom: 10px; line-height: 1.3;
  transition: color 0.2s;
}

.service-card:hover .card-name { color: #fff; }

.card-desc {
  font-size: 13px; color: var(--text-secondary);
  line-height: 1.75; margin-bottom: 24px; font-weight: 300;
}

.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 500;
  color: var(--card-accent-color, var(--accent-blue));
  letter-spacing: 0.06em;
  transition: gap 0.2s var(--ease-spring);
}

.card-link svg { transition: transform 0.2s var(--ease-spring); }

.service-card:hover .card-link { gap: 10px; }
.service-card:hover .card-link svg { transform: translateX(3px); }

/* ============================================
   ABOUT BAND
   ============================================ */
.about-band {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px 120px;
}

.about-inner {
  background: linear-gradient(135deg, rgba(79, 126, 255, 0.055), rgba(139, 92, 246, 0.055));
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 80px 48px;
  text-align: center;
}

.about-inner .section-label { justify-content: center; }

.about-desc {
  font-size: 16px; color: var(--text-secondary);
  max-width: 600px; margin: 24px auto 0;
  line-height: 1.9;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  position: relative; z-index: 1;
  padding: 80px 24px 40px;
  border-top: 1px solid var(--border-subtle);
}

.footer-inner { max-width: 1200px; margin: 0 auto; }

.footer-top {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 64px; margin-bottom: 56px;
}

.footer-brand-desc {
  font-size: 13px; color: var(--text-secondary);
  line-height: 1.85; max-width: 240px;
  margin-top: 16px;
}

.footer-col-title {
  font-size: 10px; font-weight: 500; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 20px;
}

.footer-links { list-style: none; display: flex; flex-direction: column; gap: 12px; }

.footer-links a {
  font-size: 13px; color: var(--text-secondary);
  transition: color 0.2s;
  display: flex; align-items: center; gap: 7px;
}

.footer-links a::before { content: '→'; font-size: 11px; opacity: 0.35; }
.footer-links a:hover { color: var(--text-primary); }

.footer-divider { height: 1px; background: var(--border-subtle); margin-bottom: 28px; }

.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; color: var(--text-muted);
}

.footer-bottom-links { display: flex; gap: 24px; }
.footer-bottom-links a { color: var(--text-muted); transition: color 0.2s; }
.footer-bottom-links a:hover { color: var(--text-secondary); }

/* ============================================
   DETAIL PAGE
   ============================================ */
.detail-hero {
  position: relative;
  min-height: 58vh;
  display: flex; align-items: flex-end;
  padding: calc(var(--header-height) + 80px) 24px 80px;
  overflow: hidden;
}

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

.detail-hero-content {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto; width: 100%;
}

.back-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-muted);
  margin-bottom: 32px; transition: color 0.2s; letter-spacing: 0.05em;
}

.back-link:hover { color: var(--text-secondary); }
.back-link svg { transition: transform 0.2s; }
.back-link:hover svg { transform: translateX(-4px); }

.detail-badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase;
  padding: 6px 16px; border-radius: 100px;
  margin-bottom: 24px;
}

.detail-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 84px); font-weight: 600;
  line-height: 1.08; letter-spacing: -0.025em;
  margin-bottom: 24px;
}

.detail-tagline {
  font-size: clamp(15px, 2.2vw, 19px);
  color: var(--text-secondary); font-weight: 300;
  max-width: 520px; line-height: 1.8;
}

.detail-body {
  max-width: 1200px; margin: 0 auto;
  padding: 80px 24px 120px;
}

.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 18px; margin-bottom: 80px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-card);
  padding: 28px;
  transition: border-color 0.2s, background 0.2s;
}

.feature-card:hover {
  border-color: rgba(255,255,255,0.14);
  background: var(--bg-card-hover);
}

.feature-icon { font-size: 28px; margin-bottom: 16px; }

.feature-title {
  font-size: 15px; font-weight: 500; margin-bottom: 8px;
}

.feature-desc {
  font-size: 13px; color: var(--text-secondary); line-height: 1.75;
}

.screenshots-section { margin-bottom: 80px; }

.screenshots-title {
  font-family: var(--font-display);
  font-size: 28px; font-weight: 600; margin-bottom: 28px;
}

.screenshots-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}

.screenshot-placeholder {
  aspect-ratio: 9/16;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 14px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 12px; color: var(--text-muted); font-size: 13px;
}

.cta-section {
  text-align: center; padding: 72px 32px;
  background: linear-gradient(135deg, rgba(79, 126, 255, 0.06), rgba(139, 92, 246, 0.06));
  border-radius: 24px; border: 1px solid var(--border-subtle);
}

.cta-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 40px); font-weight: 600; margin-bottom: 14px;
}

.cta-desc {
  font-size: 15px; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.75;
}

.app-store-btns {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
}

.store-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 26px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 14px; font-size: 14px; font-weight: 500;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.store-btn:hover {
  border-color: rgba(255,255,255,0.18);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes card-enter {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .cards-grid-4 { grid-template-columns: repeat(2, 1fr); max-width: 100%; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; }

  .header-nav {
    display: none;
    position: fixed;
    top: var(--header-height); left: 0; right: 0;
    background: rgba(6, 9, 18, 0.97);
    backdrop-filter: blur(24px);
    padding: 20px 24px 28px;
    flex-direction: column; align-items: flex-start; gap: 0;
    border-bottom: 1px solid var(--border-subtle);
  }

  .header-nav.open { display: flex; }

  .nav-link {
    padding: 14px 0; width: 100%;
    border-bottom: 1px solid var(--border-subtle); font-size: 15px;
  }

  .nav-link:last-child { border-bottom: none; }

  .nav-cta { margin-top: 16px; width: 100%; text-align: center; padding: 13px; }

  .menu-toggle { display: flex; }

  .cards-grid { grid-template-columns: 1fr; }
  .cards-grid-4 { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer-top { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; gap: 14px; text-align: center; }
  .features-grid { grid-template-columns: 1fr; }
  .screenshots-grid { grid-template-columns: repeat(2, 1fr); }
  .about-inner { padding: 52px 24px; }

  .hero-cta-group { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; max-width: 280px; justify-content: center; }
}

@media (max-width: 480px) {
  .screenshots-grid { grid-template-columns: 1fr 1fr; }
  .app-store-btns { flex-direction: column; align-items: center; }
  .store-btn { width: 100%; max-width: 240px; justify-content: center; }
}

/* ============================================
   LANGUAGE SWITCHER
   ============================================ */
.lang-switcher {
  position: relative;
  flex-shrink: 0;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-card);
  border-radius: 100px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
  white-space: nowrap;
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.14);
  color: var(--text-primary);
}

.lang-chevron {
  opacity: 0.55;
  transition: transform 0.22s var(--ease-smooth);
}

.lang-btn.dropdown-open .lang-chevron {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 148px;
  background: rgba(10, 14, 28, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  padding: 6px;
  display: none;
  z-index: 200;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
}

.lang-dropdown.open {
  display: block;
  animation: fade-up 0.16s var(--ease-smooth) forwards;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  font-size: 13px;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
  letter-spacing: 0.03em;
  cursor: pointer;
}

.lang-option:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-primary);
}

.lang-option.active {
  color: var(--accent-blue);
  background: rgba(79, 126, 255, 0.1);
  font-weight: 500;
}

.lang-option .lang-flag {
  font-size: 14px;
  line-height: 1;
}

/* Mobile: lang switcher adjustments */
@media (max-width: 768px) {
  .lang-switcher {
    margin-top: 16px;
    width: 100%;
  }

  .lang-btn {
    width: 100%;
    justify-content: center;
    padding: 12px 16px;
    font-size: 14px;
  }

  .lang-dropdown {
    position: static;
    display: none;
    margin-top: 8px;
    width: 100%;
    box-shadow: none;
    border-radius: 12px;
  }

  .lang-dropdown.open {
    display: block;
    animation: none;
  }
}