/* Mobile and card alignment fixes — safe CSS only */

html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

.wrap,
.app-wrap {
  width: min(1120px, calc(100% - 32px));
}

.hero-grid,
.two-column,
.steps,
.bubbles-math-grid {
  align-items: stretch;
}

.hero-card,
.card,
.coach-box,
.question-card,
.confidence-box,
.progress-section,
.practice-controls,
.parent-tip-box,
.highlight-card,
.bubbles-mascot-card,
.bubbles-chat-card {
  width: 100%;
  min-width: 0;
}

.steps .card,
.two-column .card,
.hero-card,
.highlight-card {
  height: 100%;
}

.card,
.hero-card,
.highlight-card,
.bubbles-chat-card,
.bubbles-mascot-card {
  display: flex;
  flex-direction: column;
}

.card .btn,
.highlight-card .btn,
.confidence-box .btn {
  margin-top: auto;
}

.card .btn + .btn,
.highlight-card .btn + .btn,
.confidence-box .btn + .btn {
  margin-top: 10px;
}

.hero-actions,
.button-row,
.practice-actions,
.app-link-row,
.top-nav {
  align-items: stretch;
}

.btn,
button,
.app-link-row a,
.top-nav a {
  text-align: center;
  line-height: 1.25;
  min-width: 0;
  white-space: normal;
}

footer p {
  max-width: 980px;
  margin-left: auto;
  margin-right: auto;
}

@media (max-width: 960px) {
  .hero-grid,
  .two-column {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 820px) {
  .wrap,
  .app-wrap {
    width: min(100% - 24px, 840px);
  }

  .hero {
    padding: 34px 0;
  }

  .hero h1,
  .lesson-header h1 {
    font-size: clamp(2.1rem, 12vw, 3.4rem);
  }

  .tagline {
    font-size: 1.25rem;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .top-nav,
  .app-link-row,
  .hero-actions,
  .button-row,
  .practice-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .top-nav a,
  .app-link-row a,
  .btn,
  button {
    width: 100%;
  }

  .practice-controls,
  .progress-section,
  .coach-box,
  .question-card,
  .confidence-box,
  .parent-tip-box,
  .card,
  .hero-card,
  .bubbles-mascot-card,
  .bubbles-chat-card {
    padding: 18px;
    border-radius: 18px;
  }

  .progress-top {
    flex-direction: column;
    gap: 4px;
  }

  footer p:last-child {
    display: grid;
    gap: 8px;
  }

  footer p:last-child a {
    display: block;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    text-decoration: none;
  }
}

@media (max-width: 420px) {
  body {
    font-size: 16px;
  }

  .wrap,
  .app-wrap {
    width: min(100% - 18px, 840px);
  }

  .hero {
    padding: 26px 0;
  }

  .section {
    padding: 32px 0;
  }

  .practice-controls,
  .progress-section,
  .coach-box,
  .question-card,
  .confidence-box,
  .parent-tip-box,
  .card,
  .hero-card,
  .bubbles-mascot-card,
  .bubbles-chat-card {
    padding: 16px;
  }

  select,
  #answerInput,
  #bubblesMathInput {
    font-size: 16px;
  }
}