/* ══════════════════════════════════════
   MathoMagic — Design System
   Palette: dark space bg, purple brand,
   orange magic, green CTA, cyan accent
   ══════════════════════════════════════ */

/* ── Tokens ── */
:root {
  --bg:        #08060F;
  --bg-card:   #0F0C1E;
  --bg-light:  #f7f7fa;
  --purple:    #6438DC;
  --purple-lt: #8B5CF6;
  --orange:    #FF9F1E;
  --green:     #28BE78;
  --cyan:      #3CC8F0;
  --gold:      #FFC832;
  --white:     #FFFFFF;
  --gray:      #8C9AB4;
  --gray-lt:   #C8D0E0;
  --border:    rgba(255,255,255,0.08);
  --shadow:    0 8px 40px rgba(0,0,0,0.4);
  --r-sm:      8px;
  --r-md:      16px;
  --r-lg:      24px;
  --r-xl:      40px;
  --font:      'Inter', system-ui, sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── HEADER ── */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(8,6,15,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.logo {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  white-space: nowrap;
}
.logo-matho { color: var(--purple-lt); }
.logo-magic { color: var(--orange); }

nav ul {
  display: flex;
  align-items: center;
  gap: 8px;
}
nav ul li a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-lt);
  padding: 8px 14px;
  border-radius: var(--r-sm);
  transition: color 0.2s, background 0.2s;
}
nav ul li a:hover { color: var(--white); background: var(--border); }
nav ul li a.btn-nav {
  background: var(--purple);
  color: var(--white);
  padding: 8px 20px;
}
nav ul li a.btn-nav:hover { background: var(--purple-lt); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--border);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--r-sm);
  color: var(--gray-lt);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 10px;
  cursor: pointer;
  transition: background 0.2s;
}
.lang-toggle:hover { background: rgba(255,255,255,0.12); }
.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 40px;
  background: #1A1530;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 8px;
  min-width: 140px;
  display: none;
  flex-direction: column;
  gap: 2px;
  box-shadow: var(--shadow);
  z-index: 200;
}
.lang-dropdown.open { display: flex; }
.lang-opt {
  background: none;
  border: none;
  color: var(--gray-lt);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--r-sm);
  cursor: pointer;
  text-align: left;
  transition: background 0.15s, color 0.15s;
}
.lang-opt:hover { background: var(--border); color: var(--white); }
.lang-opt.active { color: var(--purple-lt); }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-lt);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ── HERO ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.25;
}
.glow-purple { width: 600px; height: 600px; background: var(--purple); top: -100px; left: -100px; }
.glow-orange { width: 400px; height: 400px; background: var(--orange); top: 200px; right: 0; }
.glow-green  { width: 300px; height: 300px; background: var(--green); bottom: 0; left: 30%; }
.glow-blue-center { width: 800px; height: 800px; background: #1E78FF; top: 50%; left: 50%; transform: translate(-50%,-50%); opacity: 0.15; }
.glow-green-right { width: 400px; height: 400px; background: var(--green); bottom: 0; right: 0; }

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--orange);
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}
.hero-accent { color: var(--gold); }
.hero-sub {
  font-size: 1.05rem;
  color: var(--gray-lt);
  line-height: 1.7;
  margin-bottom: 36px;
}
.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.btn-store {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-radius: var(--r-md);
  font-size: 0.875rem;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-store:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.3); }
.btn-store svg { width: 24px; height: 24px; flex-shrink: 0; }
.btn-store .btn-store-label { display: block; font-size: 0.65rem; opacity: 0.8; line-height: 1; }
.btn-store strong { display: block; font-size: 0.95rem; font-weight: 700; line-height: 1.3; }
.btn-apple { background: #1A1A1A; color: var(--white); border: 1px solid rgba(255,255,255,0.15); }
.btn-google { background: #1A2540; color: var(--white); border: 1px solid rgba(255,255,255,0.15); }

.hero-levels {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.level-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
}
.pill-green  { background: rgba(40,190,120,0.15); color: var(--green); border: 1px solid rgba(40,190,120,0.3); }
.pill-blue   { background: rgba(30,120,255,0.15); color: var(--cyan); border: 1px solid rgba(60,200,240,0.3); }
.pill-purple { background: rgba(100,56,220,0.15); color: var(--purple-lt); border: 1px solid rgba(139,92,246,0.3); }

/* Phone mockup */
.hero-visual { display: flex; justify-content: center; align-items: center; }
.phone-mockup { position: relative; }
.phone-frame {
  background: #1A1630;
  border-radius: 44px;
  border: 2px solid rgba(255,255,255,0.12);
  overflow: hidden;
  width: 280px;
  box-shadow: 0 40px 80px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.06);
  position: relative;
}
.phone-frame::before {
  content: '';
  display: block;
  width: 80px; height: 20px;
  background: #0A0818;
  border-radius: 0 0 14px 14px;
  position: absolute;
  top: 0; left: 50%; transform: translateX(-50%);
  z-index: 2;
}
.phone-frame-sm {
  width: 180px;
  border-radius: 32px;
}
.phone-screen { width: 100%; }

.floating-stat {
  position: absolute;
  background: rgba(15,12,30,0.9);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 10px 16px;
  backdrop-filter: blur(10px);
  text-align: center;
}
.stat-num { display: block; font-size: 1.4rem; font-weight: 900; color: var(--orange); }
.stat-lbl { display: block; font-size: 0.65rem; color: var(--gray); text-transform: uppercase; letter-spacing: 1px; }
.stat-1 { top: 20px; left: -60px; }
.stat-2 { top: 50%; right: -60px; transform: translateY(-50%); }
.stat-3 { bottom: 40px; left: -50px; }

/* ── SECTION COMMON ── */
section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--orange);
  margin-bottom: 12px;
}
.eyebrow-light { color: var(--cyan); }
.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section-sub {
  font-size: 1rem;
  color: var(--gray-lt);
  max-width: 560px;
  margin: 0 auto;
}

/* ── FEATURE HERO CARD (Solo Challenges) ── */
.feature-hero-row { margin-bottom: 24px; }
.feature-hero-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
  background: linear-gradient(135deg, rgba(100,56,220,0.18), rgba(255,160,30,0.08));
  border: 1px solid rgba(100,56,220,0.3);
  border-radius: var(--r-xl);
  padding: 48px;
  overflow: hidden;
  position: relative;
}
.feature-hero-card::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 300px; height: 300px;
  background: var(--purple);
  border-radius: 50%;
  opacity: 0.06;
  pointer-events: none;
}
.feature-hero-text .feature-icon { width: 56px; height: 56px; font-size: 1.5rem; margin-bottom: 20px; }
.feature-hero-text h3 { font-size: 1.6rem; font-weight: 800; margin-bottom: 12px; }
.feature-hero-text > p { font-size: 1rem; color: var(--gray-lt); line-height: 1.7; margin-bottom: 24px; }
.feature-bullets {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.feature-bullets li {
  font-size: 0.9rem;
  color: var(--gray-lt);
  padding-left: 20px;
  position: relative;
}
.feature-bullets li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--purple-lt);
  font-size: 0.8rem;
  font-weight: 700;
}
.feature-hero-phone {
  display: flex;
  justify-content: center;
  align-items: center;
}
.feature-hero-phone .phone-frame-sm { width: 200px; }

.features-grid-5 { grid-template-columns: repeat(5, 1fr); }

@media (max-width: 960px) {
  .feature-hero-card { grid-template-columns: 1fr; }
  .feature-hero-phone { display: none; }
  .features-grid-5 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .features-grid-5 { grid-template-columns: 1fr; }
  .feature-hero-card { padding: 28px; }
}

/* ── FEATURES ── */
.features { background: #0A0818; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s;
}
.feature-card:hover { border-color: rgba(255,255,255,0.18); transform: translateY(-3px); }
.feature-highlight {
  background: linear-gradient(135deg, rgba(100,56,220,0.2), rgba(255,160,30,0.1));
  border-color: rgba(100,56,220,0.3);
}
.feature-icon {
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}
.icon-purple { background: rgba(100,56,220,0.2); }
.icon-orange { background: rgba(255,160,30,0.15); }
.icon-green  { background: rgba(40,190,120,0.15); }
.icon-cyan   { background: rgba(60,200,240,0.15); }
.icon-gold   { background: rgba(255,200,50,0.15); }
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.875rem; color: var(--gray-lt); line-height: 1.6; }

/* ── CLASSROOMS ── */
.classrooms {
  position: relative;
  background: linear-gradient(180deg, #08060F 0%, #0D0B20 50%, #08060F 100%);
  overflow: hidden;
}
.classrooms-bg { position: absolute; inset: 0; pointer-events: none; }
.classrooms-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.classrooms-text h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.2;
}
.classrooms-text > p {
  font-size: 1rem;
  color: var(--gray-lt);
  line-height: 1.7;
  margin-bottom: 36px;
}
.classrooms-steps { display: flex; flex-direction: column; gap: 20px; margin-bottom: 32px; }
.step { display: flex; gap: 16px; align-items: flex-start; }
.step-num {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--purple);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.step-content h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.step-content p { font-size: 0.85rem; color: var(--gray-lt); }

.classrooms-cta-row { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.code-demo {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(30,120,255,0.12);
  border: 2px solid rgba(30,120,255,0.35);
  border-radius: var(--r-md);
  padding: 10px 24px;
}
.code-hash { font-size: 1.2rem; color: var(--cyan); font-weight: 700; }
.code-chars { font-size: 1.8rem; font-weight: 900; color: var(--cyan); letter-spacing: 6px; }
.code-caption { font-size: 0.8rem; color: var(--gray); font-style: italic; }

.audience-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--gray-lt);
}

.phone-pair { position: relative; height: 520px; display: flex; justify-content: center; align-items: center; }
.phone-back { position: absolute; right: 0; top: 40px; opacity: 0.75; z-index: 1; }
.phone-front { position: relative; z-index: 2; left: -30px; }

/* ── SUBJECTS ── */
.subjects { background: #0A0818; }
.subjects-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.subject-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 24px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--gray-lt);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  cursor: default;
}
.subject-chip:hover { background: rgba(100,56,220,0.15); border-color: rgba(139,92,246,0.3); color: var(--white); }

/* ── LEVELS ── */
.levels { background: var(--bg); }
.levels-tabs { max-width: 700px; margin: 0 auto; }
.tabs-nav {
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,0.04);
  border-radius: var(--r-md);
  padding: 4px;
  margin-bottom: 32px;
}
.tab-btn {
  flex: 1;
  padding: 10px;
  border: none;
  background: none;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.tab-btn.active, .tab-btn:hover { background: var(--purple); color: var(--white); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }
.level-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 32px;
}
.level-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.badge-green  { background: rgba(40,190,120,0.15); color: var(--green); }
.badge-blue   { background: rgba(60,200,240,0.15); color: var(--cyan); }
.badge-purple { background: rgba(100,56,220,0.15); color: var(--purple-lt); }
.level-card ul { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 24px; }
.level-card li {
  font-size: 0.9rem;
  color: var(--gray-lt);
  padding-left: 16px;
  position: relative;
}
.level-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--green);
  font-size: 0.75rem;
}

/* ── GALLERY ── */
.gallery { background: #0A0818; }
.screenshots-row {
  display: flex;
  gap: 20px;
  align-items: flex-end;
  justify-content: center;
  flex-wrap: wrap;
}
.screenshot-item {
  text-align: center;
  transition: transform 0.2s;
}
.screenshot-item:hover { transform: translateY(-6px); }
.screenshot-item p {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--gray);
}
.screenshot-main .phone-frame { width: 220px; }

/* ── DOWNLOAD ── */
.download {
  position: relative;
  padding: 100px 0;
  overflow: hidden;
  background: linear-gradient(135deg, #08060F 0%, #100D22 100%);
}
.download-bg { position: absolute; inset: 0; pointer-events: none; }
.download-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 80px;
  align-items: center;
}
.download-text h2 { font-size: 3rem; font-weight: 900; margin-bottom: 8px; }
.download-tagline { font-size: 1.1rem; font-weight: 700; color: var(--white); margin-bottom: 4px; }
.download-sub { font-size: 0.95rem; color: var(--gray); margin-bottom: 24px; }
.lang-pills { display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; }
.lang-pill {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
}
.download-stores { display: flex; gap: 12px; flex-wrap: wrap; }
.qr-card {
  background: var(--white);
  border-radius: var(--r-lg);
  padding: 20px;
  text-align: center;
}
.qr-card img { width: 160px; height: 160px; margin-bottom: 10px; }
.qr-card p { font-size: 0.75rem; color: #333; font-weight: 600; }

/* ── CONTACT ── */
.contact { background: #0A0818; }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 28px; }
.info-item { display: flex; gap: 16px; align-items: flex-start; }
.info-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 2px; }
.info-item h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 4px; }
.info-item a, .info-item p { font-size: 0.875rem; color: var(--gray-lt); }
.info-item a:hover { color: var(--purple-lt); }

.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.8rem; font-weight: 600; color: var(--gray-lt); text-transform: uppercase; letter-spacing: 0.5px; }
.form-group input,
.form-group select,
.form-group textarea {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 12px 16px;
  color: var(--white);
  font-family: var(--font);
  font-size: 0.9rem;
  transition: border-color 0.2s;
  resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--purple-lt);
}
.form-group select option { background: #1A1530; }
.btn-submit {
  background: var(--green);
  color: var(--white);
  border: none;
  border-radius: var(--r-md);
  padding: 14px 32px;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
  align-self: flex-start;
}
.btn-submit:hover { background: #22AA68; transform: translateY(-1px); }
.form-success-msg {
  display: none;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--green);
  background: rgba(40,190,120,0.1);
  border: 1px solid rgba(40,190,120,0.2);
  border-radius: var(--r-sm);
  padding: 12px 16px;
}
.form-success-msg.show { display: flex; }

/* ── FOOTER ── */
footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  margin-bottom: 40px;
}
.footer-brand p { font-size: 0.875rem; color: var(--gray); margin-top: 8px; }
.footer-copy { font-size: 0.75rem; color: var(--gray); margin-top: 16px; }
.footer-links { display: flex; gap: 60px; }
.footer-col h4 { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--gray); margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col li a { font-size: 0.875rem; color: var(--gray-lt); transition: color 0.2s; }
.footer-col li a:hover { color: var(--white); }

/* ── PRIVACY PAGE ── */
.privacy-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 140px 24px 80px;
}
.privacy-page h1 { font-size: 2rem; font-weight: 800; margin-bottom: 8px; }
.privacy-page .privacy-meta { font-size: 0.85rem; color: var(--gray); margin-bottom: 48px; }
.privacy-page h2 { font-size: 1.2rem; font-weight: 700; margin: 36px 0 12px; color: var(--purple-lt); }
.privacy-page h3 { font-size: 1rem; font-weight: 600; margin: 24px 0 8px; }
.privacy-page p, .privacy-page li { font-size: 0.9rem; color: var(--gray-lt); line-height: 1.7; margin-bottom: 8px; }
.privacy-page ul { padding-left: 20px; list-style: disc; }
.privacy-page a { color: var(--purple-lt); }

/* ── SCROLL ANIMATIONS ── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ── */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-visual { display: none; }
  .hero-cta { justify-content: center; }
  .hero-levels { justify-content: center; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .classrooms-inner { grid-template-columns: 1fr; }
  .classrooms-phones { display: none; }
  .contact-inner { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .download-inner { grid-template-columns: 1fr; }
  .download-qr { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 720px) {
  nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: rgba(8,6,15,0.97); padding: 16px; border-bottom: 1px solid var(--border); }
  nav.open { display: block; }
  nav ul { flex-direction: column; gap: 4px; }
  nav ul li a { display: block; padding: 12px 16px; }
  .menu-toggle { display: flex; }
  .features-grid { grid-template-columns: 1fr; }
  .level-card ul { grid-template-columns: 1fr; }
  .screenshots-row { gap: 12px; }
  .phone-frame { width: 160px; }
  section { padding: 64px 0; }
}

/* ── CHALLENGES SECTION (mirrors classrooms) ── */
.challenges {
  position: relative;
  background: linear-gradient(180deg, #08060F 0%, #100820 50%, #08060F 100%);
  overflow: hidden;
  padding: 100px 0;
}
.challenges-bg { position: absolute; inset: 0; pointer-events: none; }
.glow-purple-center { width: 700px; height: 700px; background: var(--purple); top: 50%; left: 50%; transform: translate(-50%,-50%); opacity: 0.12; }

.challenges-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.challenges-text h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.2;
}
.challenges-text > p {
  font-size: 1rem;
  color: var(--gray-lt);
  line-height: 1.7;
  margin-bottom: 36px;
}
.eyebrow-gold { color: var(--gold) !important; }
.challenges-steps { display: flex; flex-direction: column; gap: 20px; margin-bottom: 36px; }
.step-gold {
  background: linear-gradient(135deg, var(--gold), var(--orange)) !important;
  font-size: 1rem !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.challenge-stats {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 20px 32px;
  width: fit-content;
}
.cstat { text-align: center; padding: 0 28px; }
.cstat-num { display: block; font-size: 2rem; font-weight: 900; color: var(--gold); line-height: 1; margin-bottom: 4px; }
.cstat-lbl { display: block; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px; color: var(--gray); }
.cstat-div { width: 1px; height: 40px; background: var(--border); flex-shrink: 0; }

/* Mirror phone-pair for challenges (phones left side) */
.challenges-phones { display: flex; justify-content: center; align-items: center; }
.challenges-phones .phone-pair { position: relative; height: 520px; display: flex; justify-content: center; align-items: center; }
.challenges-phones .phone-back { position: absolute; left: 0; top: 40px; opacity: 0.75; z-index: 1; }
.challenges-phones .phone-front { position: relative; z-index: 2; right: -30px; }

@media (max-width: 960px) {
  .challenges-inner { grid-template-columns: 1fr; }
  .challenges-phones { display: none; }
}
/* ── HERO AVAILABLE IN (language pills) ── */
.hero-available {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 20px;
  flex-wrap: wrap;
}
.available-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 1px;
  white-space: nowrap;
}
.available-pills { display: flex; gap: 10px; }
.flag-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 8px;
  border-radius: 24px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-lt);
  transition: border-color 0.2s, background 0.2s;
}
.flag-pill:hover { border-color: rgba(255,255,255,0.25); background: rgba(255,255,255,0.1); }
.flag-img {
  display: inline-block;
  width: 22px;
  height: 15px;
  border-radius: 3px;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}
.flag-uk {
  background: #012169;
  position: relative;
  overflow: hidden;
}
.flag-uk::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom right, transparent 45%, #fff 45%, #fff 55%, transparent 55%),
    linear-gradient(to bottom left,  transparent 45%, #fff 45%, #fff 55%, transparent 55%);
}
.flag-uk::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom right, transparent 46%, #C8102E 46%, #C8102E 54%, transparent 54%),
    linear-gradient(to bottom left,  transparent 46%, #C8102E 46%, #C8102E 54%, transparent 54%),
    linear-gradient(#fff 0 calc(50% - 2px), #C8102E calc(50% - 2px) calc(50% + 2px), #fff calc(50% + 2px)),
    linear-gradient(90deg, #fff 0 calc(50% - 2px), #C8102E calc(50% - 2px) calc(50% + 2px), #fff calc(50% + 2px));
}
.flag-fr {
  background: linear-gradient(90deg, #002395 33.33%, #fff 33.33% 66.66%, #ED2939 66.66%);
}

/* ── LOGO IMAGE ── */
.logo { display: flex; align-items: center; gap: 10px; }
.logo-img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
}

/* ── OFFICIAL STORE BADGES ── */
.badge-link {
  display: inline-block;
  transition: transform 0.2s, opacity 0.2s;
}
.badge-link:hover { transform: translateY(-2px); opacity: 0.9; }
.store-badge {
  height: 44px;
  width: auto;
  display: block;
}
.store-badge-lg {
  height: 56px;
}

/* ── DOWNLOAD LOGO ── */
.download-logo {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 4px;
}
.download-logo-img {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.download-logo h2 { margin: 0; }