:root {
  --bg: #fff9ed;
  --ink: #243044;
  --muted: #667085;
  --blue: #35b8ff;
  --green: #68d391;
  --yellow: #ffd166;
  --pink: #ff8fb3;
  --coral: #ff7a59;
  --panel: #ffffff;
  --line: #e8e1d4;
  --shadow: 0 18px 45px rgba(31, 45, 61, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Trebuchet MS", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(53, 184, 255, 0.22), transparent 28rem),
    linear-gradient(135deg, #fff9ed 0%, #eefaff 46%, #fff4f7 100%);
}

button, input {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem clamp(1rem, 3vw, 2rem);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  background: transparent;
  text-align: left;
}

.brand-mark {
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  color: #fff;
  font-size: 1.6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--blue), var(--green));
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.brand small, .profile-pill, .hint, small {
  color: var(--muted);
}

.brand span:last-child {
  display: grid;
}

.profile-pill {
  margin-left: auto;
  padding: 0.65rem 0.9rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.install-btn, .primary, .secondary, .danger {
  min-height: 2.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.9rem;
  font-weight: 800;
}

.primary {
  color: #fff;
  background: var(--coral);
  box-shadow: 0 10px 24px rgba(255, 122, 89, 0.24);
}

.secondary, .install-btn {
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
}

.danger {
  color: #fff;
  background: #ef4444;
}

.hidden { display: none; }

.app-shell {
  display: grid;
  grid-template-columns: 14rem 1fr;
  gap: 1.25rem;
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 1.25rem;
}

.side-nav {
  position: sticky;
  top: 5.2rem;
  display: grid;
  gap: 0.45rem;
  align-self: start;
  max-height: calc(100vh - 6rem);
  overflow: auto;
}

.side-nav button {
  padding: 0.85rem 0.95rem;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid transparent;
  border-radius: 0.9rem;
  text-align: left;
}

.side-nav button.active {
  background: #fff;
  border-color: var(--blue);
  box-shadow: var(--shadow);
}

.content {
  display: grid;
  gap: 1.25rem;
}

.hero-panel, .section-head, .profile-form, .quiz-card, .challenge-card, .settings-panel, .panel, .reading-card, .report {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  box-shadow: var(--shadow);
}

.hero-panel {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.25rem;
  align-items: center;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  min-height: 20rem;
}

.avatar-big {
  display: block;
  font-size: 4rem;
}

h1, h2, p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.45rem;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  font-size: 1.35rem;
  letter-spacing: 0;
}

.eyebrow {
  margin-bottom: 0.45rem;
  color: #008fc9;
  font-weight: 900;
  text-transform: uppercase;
}

.hero-actions, .toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.stats-grid.wide {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.stats-grid div {
  display: grid;
  gap: 0.25rem;
  min-height: 6rem;
  padding: 1rem;
  background: #f7fcff;
  border: 1px solid #d8efff;
  border-radius: 1rem;
}

.stats-grid strong {
  font-size: 2rem;
}

.section-head {
  padding: 1.25rem;
}

.module-grid, .profile-grid, .badge-grid, .color-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 1rem;
}

.module-card, .learning-card, .profile-card, .badge-card, .color-card, .letter-card, .sound-chip, .sentence-list button, .text-choice {
  display: grid;
  gap: 0.45rem;
  min-height: 8.5rem;
  padding: 1rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  box-shadow: 0 8px 18px rgba(31, 45, 61, 0.08);
  text-align: left;
}

.module-card span, .learning-card span, .badge-card span {
  font-size: 2.5rem;
}

.module-card:hover, .learning-card:hover, .letter-card:hover, .sound-chip:hover, .choice:hover {
  transform: translateY(-2px);
}

.profile-form {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
}

input {
  width: 100%;
  min-height: 3rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
}

.avatar-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.avatar-row input {
  position: absolute;
  opacity: 0;
}

.avatar-row span {
  display: grid;
  width: 3.2rem;
  height: 3.2rem;
  place-items: center;
  font-size: 1.8rem;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 1rem;
}

.avatar-row input:checked + span {
  border-color: var(--coral);
  background: #fff0eb;
}

.profile-card.selected, .text-choice.selected {
  border-color: var(--green);
  background: #effff4;
}

.avatar {
  font-size: 2.5rem;
}

.letter-grid, .chip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(5.4rem, 1fr));
  gap: 0.8rem;
}

.letter-card {
  min-height: 7.8rem;
  text-align: center;
  place-items: center;
}

.letter-card strong {
  font-size: 2rem;
}

.sound-chip {
  min-height: 4.3rem;
  place-items: center;
  font-size: 1.45rem;
  font-weight: 900;
  text-align: center;
}

.sentence-list, .text-list {
  display: grid;
  gap: 0.75rem;
}

.sentence-list button {
  min-height: 4rem;
  font-size: 1.25rem;
}

.reading-layout {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: 1rem;
}

.reading-card {
  padding: 1.25rem;
}

.reading-text {
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  line-height: 1.45;
}

.choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.75rem;
}

.choice {
  min-height: 4rem;
  padding: 0.85rem;
  color: var(--ink);
  background: #fff9d9;
  border: 1px solid #f2df8a;
  border-radius: 1rem;
  font-weight: 900;
}

.quiz-color, .color-card span {
  display: block;
  width: 100%;
  height: 4.5rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
}

.mix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 0.75rem;
}

.mix-card {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 1rem;
}

.mix-card strong {
  padding: 0.6rem 0.85rem;
  border-radius: 0.8rem;
}

.challenge-card {
  display: grid;
  justify-items: start;
  gap: 0.4rem;
  padding: 1.5rem;
}

.challenge-card span {
  font-size: 3rem;
}

.badge-card {
  opacity: 0.46;
  filter: grayscale(1);
}

.badge-card.unlocked {
  opacity: 1;
  filter: none;
  border-color: var(--yellow);
  background: #fff9db;
}

.dashboard {
  display: grid;
  gap: 1rem;
}

.panel {
  padding: 1rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 0.8rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.settings-panel {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
}

.empty-state {
  display: grid;
  justify-items: start;
  gap: 0.7rem;
  padding: 1.5rem;
  background: #fff;
  border: 1px dashed var(--blue);
  border-radius: 1.2rem;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 20;
  max-width: min(24rem, calc(100vw - 2rem));
  padding: 1rem 1.2rem;
  color: #fff;
  background: #243044;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  animation: pop 0.24s ease-out;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

body:not(.no-animations) .module-card,
body:not(.no-animations) .learning-card,
body:not(.no-animations) .letter-card,
body:not(.no-animations) .sound-chip,
body:not(.no-animations) .choice {
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

@keyframes pop {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    padding: 0.85rem;
  }

  .side-nav {
    position: static;
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    max-height: none;
    padding-bottom: 0.4rem;
  }

  .side-nav button {
    white-space: nowrap;
  }

  .hero-panel, .reading-layout {
    grid-template-columns: 1fr;
  }

  .stats-grid.wide {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .topbar {
    flex-wrap: wrap;
  }

  .profile-pill {
    margin-left: 0;
  }

  .brand small {
    display: none;
  }

  .stats-grid, .stats-grid.wide {
    grid-template-columns: 1fr;
  }

  .module-grid, .profile-grid, .badge-grid, .color-grid {
    grid-template-columns: 1fr;
  }
}