body {
      box-sizing: border-box;
      font-family: 'Montserrat', sans-serif;
      font-weight: 500;
    }
    
    .gradient-btn {
      background: linear-gradient(145deg, #6b4c9a, #4a2c6a);
      box-shadow: 0 4px 15px rgba(75, 44, 106, 0.4), inset 0 1px 0 rgba(255,255,255,0.1);
      transition: all 0.3s ease;
    }
    
    .gradient-btn:hover {
      background: linear-gradient(145deg, #7d5cb0, #5a3c7a);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(75, 44, 106, 0.5), inset 0 1px 0 rgba(255,255,255,0.15);
    }
    
    .gradient-container {
      background: linear-gradient(145deg, #5e4a7a, #3d2a5a);
      box-shadow: 0 8px 32px rgba(61, 42, 90, 0.4), inset 0 1px 0 rgba(255,255,255,0.05);
      border-radius: 16px;
    }
    
    .card-3d {
      background: linear-gradient(145deg, #6b4c9a, #4a2c6a);
      box-shadow: 0 10px 30px rgba(75, 44, 106, 0.5), 0 4px 8px rgba(0,0,0,0.2);
      transform-style: preserve-3d;
      transition: transform 0.6s;
    }
    
    .card-3d.flipped {
      transform: rotateY(180deg);
    }
    
    .card-front, .card-back {
      backface-visibility: hidden;
      position: absolute;
      width: 100%;
      height: 100%;
      border-radius: 12px;
    }
    
    .card-back {
      transform: rotateY(180deg);
    }
    
    .memory-card {
      perspective: 1000px;
      cursor: pointer;
    }
    
    .memory-card-inner {
      transition: transform 0.5s;
      transform-style: preserve-3d;
    }
    
    .memory-card.matched .memory-card-inner {
      box-shadow: 0 0 20px rgba(100, 255, 100, 0.5);
    }
    
    .input-light {
      background: #f5f3f7;
      border: 2px solid #d4c8e0;
    }
    
    .input-light:focus {
      border-color: #6b4c9a;
      outline: none;
      box-shadow: 0 0 0 3px rgba(107, 76, 154, 0.2);
    }
    
    .progress-bar {
      background: linear-gradient(90deg, #6b4c9a, #8b6cba);
    }
    
    .nav-item {
      transition: all 0.3s ease;
    }
    
    .nav-item:hover, .nav-item.active {
      background: linear-gradient(145deg, #6b4c9a, #4a2c6a);
    }
    
    .checkbox-custom {
      appearance: none;
      width: 24px;
      height: 24px;
      border: 2px solid #6b4c9a;
      border-radius: 6px;
      background: #f5f3f7;
      cursor: pointer;
      transition: all 0.2s;
    }
    
    .checkbox-custom:checked {
      background: linear-gradient(145deg, #6b4c9a, #4a2c6a);
      border-color: #4a2c6a;
    }
    
    .checkbox-custom:checked::after {
      content: '✓';
      display: block;
      text-align: center;
      color: white;
      font-size: 14px;
      line-height: 20px;
    }
    
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }
    
    .animate-fade-in {
      animation: fadeIn 0.4s ease forwards;
    }
    
    .toast {
      position: fixed;
      bottom: 20px;
      right: 20px;
      padding: 16px 24px;
      border-radius: 12px;
      color: white;
      z-index: 1000;
      animation: slideIn 0.3s ease;
    }
    
    .toast-success {
      background: linear-gradient(145deg, #4a7c59, #2d5a3a);
    }
    
    .toast-error {
      background: linear-gradient(145deg, #8b4a4a, #6a2a2a);
    }
    
    @keyframes slideIn {
      from { transform: translateX(100%); opacity: 0; }
      to { transform: translateX(0); opacity: 1; }
    }


:root {
  --bg: #eff4ee;
  --bg-2: #e6eee3;
  --surface: #f8fbf7;
  --surface-2: #f2f7f1;
  --ink: #234031;
  --muted: #5c7465;
  --green-1: #446b55;
  --green-2: #5b7e67;
  --green-3: #6f927a;
  --green-4: #dfe9e1;
  --accent-rainbow: linear-gradient(90deg, #7b5fd6 0%, #69b36b 48%, #e36ca5 100%);
  --shadow-soft: 0 12px 30px rgba(39, 65, 50, 0.10);
  --shadow-card: 0 8px 22px rgba(39, 65, 50, 0.08);
  --border: rgba(91, 126, 103, 0.16);
}
html, body {scroll-behavior: smooth;}
body.mha-body {
  box-sizing: border-box;
  font-family: 'Montserrat', sans-serif;
  font-weight: 500;
  background: url('../assets/background.png') center/cover no-repeat;
  color: var(--ink);
}
* { font-family: 'Montserrat', sans-serif; }
.gradient-btn {
  background: linear-gradient(145deg, var(--green-2), var(--green-1));
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
}
.gradient-btn:hover { transform: translateY(-1px); filter: brightness(1.03); }
.hero-shell, .section-shell, .nav-shell {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  background: linear-gradient(180deg, rgba(248,251,247,0.98), rgba(242,247,241,0.96));
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  border-radius: 28px;
  position: relative;
  overflow: hidden;
}
.hero-shell::before, .nav-shell::before, .how-card::before, .section-shell::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--accent-rainbow);
}
#main-title, .section-title, h2, h3, h4, .text-white {
  color: var(--ink) !important;
}
#subtitle, .text-purple-200, .text-purple-300 { color: var(--muted) !important; }
.text-purple-800 { color: var(--ink) !important; }
.text-white strong, strong.text-white { color: var(--ink) !important; }
.nav-item {
  transition: all 0.2s ease;
  background: linear-gradient(180deg, #6f927a, #5b7e67);
  box-shadow: 0 6px 14px rgba(55, 88, 68, 0.16);
}
.nav-item:hover, .nav-item.active {
  background: linear-gradient(180deg, #446b55, #365645);
}
.nav-item.active { box-shadow: inset 0 0 0 1px rgba(255,255,255,0.15), 0 8px 18px rgba(39,65,50,0.18); }
.home-activity-card {
  background: linear-gradient(180deg, #4d745d, #3f624f);
  border-radius: 24px;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(255,255,255,0.08);
}
.home-activity-card h3, .home-activity-card p { color: #f4f7f4 !important; }
.soft-panel, .info-panel {
  background: rgba(255,255,255,0.62);
  border: 1px solid rgba(91,126,103,0.12);
  box-shadow: var(--shadow-card);
}
.soft-panel-inner {
  background: rgba(255,255,255,0.5);
}
.subtle-border { border-color: rgba(91,126,103,0.12); }
.how-shell { max-width: 1180px; margin-left:auto; margin-right:auto; }
.eyebrow-pill {
  display: inline-block; padding: 10px 16px; border-radius: 999px;
  background: rgba(91,126,103,0.10); color: var(--green-1); font-size: 0.95rem;
  border: 1px solid rgba(91,126,103,0.14);
}
.section-intro { color: var(--muted); max-width: 72ch; }
.how-grid { display:grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 14px; }
.how-step { background: rgba(255,255,255,0.62); border: 1px solid var(--border); border-radius: 22px; padding: 16px; display:flex; gap:12px; align-items:flex-start; }
.how-step span { width: 30px; height: 30px; border-radius:999px; display:inline-flex; align-items:center; justify-content:center; background: linear-gradient(180deg, var(--green-2), var(--green-1)); color: white; flex: 0 0 30px; }
.input-light { background: #fbfdfb; border: 2px solid #d3dfd5; color: var(--ink); }
.input-light:focus { border-color: var(--green-2); box-shadow: 0 0 0 3px rgba(91,126,103,0.16); }
.progress-bar { background: linear-gradient(90deg, var(--green-2), #87aa92); }
.card-3d {
  background: linear-gradient(160deg, #4f725c, #365645);
  box-shadow: 0 14px 30px rgba(39,65,50,0.18);
  border-radius: 22px;
}
.card-front, .card-back { border-radius: 22px; }
.memory-card.matched .memory-card-inner { box-shadow: 0 0 18px rgba(112, 170, 126, 0.45); }
.toast-success { background: linear-gradient(145deg, #5b7e67, #446b55); }
.toast-error { background: linear-gradient(145deg, #8b4a4a, #6a2a2a); }
footer p { color: var(--muted) !important; }
#memory-grid .card-back, #flashcard-inner .card-back { background: linear-gradient(180deg, #6f927a, #4f725c) !important; }
#memory-grid .card-front img { border-radius: 18px; }
.bg-white\/10, .bg-white\/5, .bg-purple-900\/30 { background-color: rgba(255,255,255,0.48) !important; }
.border-purple-400\/30, .border-white\/20, .divide-white\/10 { border-color: rgba(91,126,103,0.12) !important; }
@media (max-width: 700px) {
  .hero-shell, .section-shell, .nav-shell { border-radius: 22px; }
}


/* refreshed package structure */
body.mha-body {
  background: url('../assets/background.png') center/cover no-repeat;
}
.hero-shell, .nav-shell, .explore-shell, .section-shell {
  max-width: 1180px;
}
.hero-shell {
  margin-bottom: 1rem;
}
.nav-shell {
  margin-top: 0;
  margin-bottom: 1rem;
}
#content { max-width: 1220px; margin-left: auto; margin-right: auto; }
.hub-screen {
  min-height: 0;
  display: flex;
  align-items: flex-start;
}

/* Avoid iframe resize feedback loops: never size content from viewport height */
#content, .explore-shell, .section-shell {
  min-height: 0;
}
.explore-shell { width: 100%; }
#flashcard-container .card-front,
#flashcard-container .card-back,
#flashcard-term,
#flashcard-definition,
#flashcard-container .text-purple-200,
#flashcard-counter {
  color: #ffffff !important;
}
#flashcard-container .card-front p,
#flashcard-container .card-front h3,
#flashcard-container .card-back p {
  color: #ffffff !important;
}
.quarterly-update-card {
  background: linear-gradient(180deg, rgba(248,251,247,0.96), rgba(242,247,241,0.92));
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow-card);
  padding: 1.25rem;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
}
.quarterly-update-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--accent-rainbow);
}
.update-date {
  display: inline-block;
  background: rgba(91,126,103,0.10);
  color: var(--green-1);
  border: 1px solid rgba(91,126,103,0.16);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}
.status-card { background: linear-gradient(180deg, rgba(232,239,233,0.96), rgba(244,248,243,0.96)); }


/* regenerated tweaks */
body.mha-body {
  background-image: url('../assets/background.png') !important;
  background-size: cover !important;
  background-position: center !important;
  background-attachment: scroll !important;
  background-repeat: no-repeat !important;
}
.hero-shell, .nav-shell {
  width: min(1180px, calc(100% - 2rem));
  margin-left: auto !important;
  margin-right: auto !important;
}
.hero-shell { margin-top: 1rem; }
.nav-shell {
  margin-top: 0.75rem !important;
  margin-bottom: 1rem !important;
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-shell > *, .nav-shell > * { text-align: center; }
.gradient-btn, .gradient-btn * , .nav-item, .nav-item * {
  color: #ffffff !important;
}
.gradient-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
#main-nav .nav-item {
  color: #ffffff !important;
}
.quarterly-header-card {
  background: linear-gradient(180deg, rgba(248,251,247,0.96), rgba(242,247,241,0.92));
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow-card);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
}
.quarterly-header-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--accent-rainbow);
}
#updates-section .section-shell > h2 {
  margin-bottom: 1rem;
}


/* v4 polish */
body.mha-body::before, #app::before { content:none !important; display:none !important; }
.hero-shell, .nav-shell { width:min(1180px, calc(100% - 2rem)); margin-left:auto; margin-right:auto; }
.hero-shell { text-align:center; }
.gradient-btn, .gradient-btn *, .nav-item, .nav-item * { color:#ffffff !important; }
.gradient-btn { display:inline-flex; align-items:center; justify-content:center; }
.quarterly-header-card { background: linear-gradient(180deg, rgba(47,79,58,0.94), rgba(35,61,45,0.94)); border:1px solid rgba(173,145,54,0.25); border-radius:22px; padding:1.25rem 1.25rem 1rem; margin-bottom:1rem; }
.quarterly-header-card h3, .quarterly-header-card p { color:#fff !important; }
.home-card-link.updates-callout { grid-column:1/-1; display:flex; flex-direction:column; align-items:flex-start; }
.home-card-link.updates-callout .card-date { display:block; margin-top:0.35rem; font-size:0.85rem; line-height:1.3; color:rgba(255,255,255,0.85); }
@media (min-width: 900px) { .explore-shell .grid { align-items:stretch; } }


/* Memory card text visibility */
#memory-grid .card-back p,
#memory-grid .memory-card .card-back,
#memory-grid .memory-card .card-back span,
#memory-grid .memory-card .card-back div {
  color: #ffffff !important;
}


/* v5 background and updates callout fixes */
html, body, body.mha-body, #app {
  background-color: transparent !important;
}
#content, main, .hub-screen {
  background: transparent !important;
}
.hero-shell, .nav-shell, .explore-shell, .section-shell, .quarterly-header-card, .quarterly-update-card {
  backdrop-filter: none !important;
}
.hero-shell, .nav-shell, .explore-shell, .section-shell {
  background: linear-gradient(180deg, rgba(248,251,247,0.88), rgba(242,247,241,0.84)) !important;
}
.home-card-link.updates-callout {
  grid-column: 1 / -1;
  display: flex !important;
  flex-direction: column !important;
  align-items: flex-start !important;
  gap: 0.25rem;
}
.home-card-link.updates-callout h3,
.home-card-link.updates-callout p,
.home-card-link.updates-callout .card-date {
  color: #ffffff !important;
}
.home-card-link.updates-callout .card-date {
  display: block !important;
  width: 100%;
  margin-top: 0.35rem;
  padding-top: 0.55rem;
  border-top: 1px solid rgba(255,255,255,0.18);
  font-size: 0.86rem;
  line-height: 1.35;
  opacity: 0.92;
}


html, body {
  height: auto;
  min-height: 0;
  overflow: visible;
  margin: 0;
  padding: 0;
}

#app {
  min-height: 0;
}

body.mha-body {
  background-attachment: scroll;
}

.completion-shell {
  max-width: 820px;
}


/* v3 iframe background sizing fix */
body.mha-body {
  background-image: url('../assets/background.png') !important;
  background-size: 100% auto !important;
  background-position: top center !important;
  background-repeat: no-repeat !important;
  background-attachment: scroll !important;
}
@media (max-width: 900px) {
  body.mha-body {
    background-size: 100% auto !important;
    background-position: top center !important;
  }
}


/* v4 fixed viewport background without background-attachment: fixed */
html, body {
  height: auto !important;
  min-height: 0 !important;
  overflow: visible !important;
  margin: 0;
  padding: 0;
  background: transparent !important;
}

body.mha-body {
  position: relative;
  isolation: isolate;
  background: transparent !important;
}

body.mha-body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: url('../assets/background.png');
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}

#app {
  position: relative;
  z-index: 1;
  min-height: 0 !important;
  background: transparent !important;
}