/* ==========================================================================
   Curriculum — Young Architect's Studio Design System
   Architecture-themed education app for children
   BEM methodology, no-build, Propshaft
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ==========================================================================
   Custom Properties
   ========================================================================== */
:root {
  /* Blueprint palette */
  --color-blueprint: #1b3a5c;
  --color-blueprint-light: #264d73;
  --color-blueprint-dark: #0f2440;
  --color-grid-line: rgba(255, 255, 255, 0.08);

  /* Warm accents */
  --color-amber: #f59e0b;
  --color-amber-light: #fbbf24;
  --color-terracotta: #c2410c;
  --color-brick: #9a3412;

  /* Functional */
  --color-correct: #16a34a;
  --color-correct-bg: #dcfce7;
  --color-correct-border: #86efac;
  --color-wrong: #dc2626;
  --color-wrong-bg: #fef2f2;
  --color-wrong-border: #fca5a5;

  /* Neutrals */
  --color-cream: #faf7f2;
  --color-paper: #ffffff;
  --color-sand: #f5f0e8;
  --color-ink: #1c1917;
  --color-ink-light: #57534e;
  --color-ink-muted: #a8a29e;
  --color-border: #e7e5e4;

  /* Typography */
  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'Nunito', system-ui, sans-serif;

  /* Child-friendly sizes (18px+ body) */
  --text-xs: 0.875rem;
  --text-sm: 1rem;
  --text-base: 1.125rem;
  --text-lg: 1.375rem;
  --text-xl: 1.75rem;
  --text-2xl: 2.25rem;
  --text-3xl: 3rem;
  --text-4xl: 4rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Sizing */
  --tap-target: 48px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-glow-correct: 0 0 20px rgba(22, 163, 74, 0.3);
  --shadow-glow-wrong: 0 0 20px rgba(220, 38, 38, 0.2);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink);
  background-color: var(--color-cream);
  min-height: 100dvh;
}

a {
  color: var(--color-blueprint);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-blueprint-light);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes pulse-correct {
  0% { box-shadow: 0 0 0 0 rgba(22, 163, 74, 0.4); }
  70% { box-shadow: 0 0 0 12px rgba(22, 163, 74, 0); }
  100% { box-shadow: 0 0 0 0 rgba(22, 163, 74, 0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

@keyframes countUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ==========================================================================
   Flash Messages
   ========================================================================== */
.flash {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: center;
  animation: fadeInUp 0.3s ease;
}

.flash--notice {
  background-color: var(--color-correct-bg);
  color: var(--color-correct);
  border-bottom: 2px solid var(--color-correct-border);
}

.flash--alert {
  background-color: var(--color-wrong-bg);
  color: var(--color-wrong);
  border-bottom: 2px solid var(--color-wrong-border);
}

/* ==========================================================================
   HOME PAGE
   ========================================================================== */
.home {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: var(--space-xl);
  text-align: center;
  background:
    linear-gradient(135deg, var(--color-blueprint-dark) 0%, var(--color-blueprint) 50%, var(--color-blueprint-light) 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

/* Blueprint grid overlay */
.home::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* Decorative building silhouette */
.home::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background:
    linear-gradient(to right,
      transparent 5%,
      rgba(255, 255, 255, 0.04) 5%, rgba(255, 255, 255, 0.04) 8%,
      transparent 8%, transparent 15%,
      rgba(255, 255, 255, 0.03) 15%, rgba(255, 255, 255, 0.03) 22%,
      transparent 22%, transparent 30%,
      rgba(255, 255, 255, 0.05) 30%, rgba(255, 255, 255, 0.05) 35%,
      transparent 35%, transparent 50%,
      rgba(255, 255, 255, 0.04) 50%, rgba(255, 255, 255, 0.04) 58%,
      transparent 58%, transparent 65%,
      rgba(255, 255, 255, 0.03) 65%, rgba(255, 255, 255, 0.03) 70%,
      transparent 70%, transparent 80%,
      rgba(255, 255, 255, 0.05) 80%, rgba(255, 255, 255, 0.05) 88%,
      transparent 88%
    );
  pointer-events: none;
}

.home__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  position: relative;
  animation: fadeInUp 0.6s ease;
}

.home__tagline {
  font-size: var(--text-lg);
  opacity: 0.85;
  margin-bottom: var(--space-3xl);
  position: relative;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.home__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.home__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-2xl);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-blueprint-dark);
  background: white;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  text-decoration: none;
  min-width: 280px;
}

.home__btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-blueprint-dark);
}

.home__btn--child {
  background: var(--color-amber);
  color: white;
}

.home__btn--child:hover {
  background: var(--color-amber-light);
  color: white;
}

@media (min-width: 768px) {
  .home__actions {
    flex-direction: row;
    gap: var(--space-lg);
  }

  .home__title {
    font-size: 4.5rem;
  }
}

/* ==========================================================================
   PIN LOGIN
   ========================================================================== */
.pin-login {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80dvh;
  padding: var(--space-xl);
  text-align: center;
}

.pin-login__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-cream);
  margin-bottom: var(--space-2xl);
}

.pin-login__form {
  width: 100%;
  max-width: 360px;
}

.pin-login__digits {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-2xl);
}

.pin-login__digit {
  width: 72px;
  height: 84px;
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  text-align: center;
  color: var(--color-blueprint);
  background: var(--color-paper);
  border: 3px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.pin-login__digit:focus {
  border-color: var(--color-blueprint);
  box-shadow: 0 0 0 4px rgba(27, 58, 92, 0.15);
}

.pin-login__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
  background: var(--color-blueprint);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.pin-login__submit:hover {
  background: var(--color-blueprint-light);
  transform: translateY(-1px);
}

.pin-login__submit:active {
  transform: translateY(0);
}

/* ==========================================================================
   LEARN BODY & LAYOUT (child-facing)
   ========================================================================== */
.learn-body {
  background:
    linear-gradient(180deg, var(--color-blueprint-dark) 0%, var(--color-blueprint) 100%);
  color: white;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Blueprint grid on learn pages */
.learn-body .learn-main {
  position: relative;
}

.learn-body .learn-main::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.learn-main {
  padding: var(--space-lg);
  max-width: 640px;
  width: 100%;
  box-sizing: border-box;
  margin: 0 auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
}

.learn-main > * {
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .learn-main {
    padding: var(--space-2xl);
  }
}

/* ==========================================================================
   LEARN HOME
   ========================================================================== */
.learn-home {
  animation: fadeInUp 0.5s ease;
}

.learn-home__welcome {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  margin-bottom: var(--space-lg);
}

.learn-home__streak {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
}

.learn-home__streak-count {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-amber);
  animation: countUp 0.4s ease 0.2s both;
}

.learn-home__streak-start {
  font-size: var(--text-lg);
  opacity: 0.7;
}

.learn-home__streak-best {
  font-size: var(--text-sm);
  opacity: 0.6;
}

.learn-home__assignment-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  text-align: center;
  animation: scaleIn 0.4s ease 0.3s both;
}

.learn-home__assignment-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.learn-home__assignment-score {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-correct-border);
  margin-bottom: var(--space-md);
}

.learn-home__assignment-progress {
  font-size: var(--text-lg);
  opacity: 0.8;
  margin-bottom: var(--space-lg);
}

.learn-home__assignment-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: var(--space-md) var(--space-3xl);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-blueprint-dark);
  background: var(--color-amber);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.learn-home__assignment-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
  color: var(--color-blueprint-dark);
}

.learn-home__assignment-card--completed {
  border-color: rgba(22, 163, 74, 0.3);
  background: rgba(22, 163, 74, 0.15);
}

.learn-home__assignment-card--empty {
  opacity: 0.7;
}

@media (min-width: 768px) {
  .learn-home__welcome {
    font-size: var(--text-3xl);
  }
}

/* ==========================================================================
   ASSIGNMENT
   ========================================================================== */
.assignment {
  animation: fadeInUp 0.5s ease;
}

.assignment__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.assignment__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
}

.assignment__progress {
  font-size: var(--text-sm);
  opacity: 0.7;
  font-weight: 600;
}

.assignment__exercises {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.assignment__exercise-wrapper {
  animation: fadeInUp 0.4s ease;
}

/* ==========================================================================
   EXERCISE
   ========================================================================== */
.exercise {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  animation: scaleIn 0.3s ease;
}

.exercise__question {
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: var(--space-xl);
}

.exercise__question-text {
  margin-bottom: var(--space-sm);
}

.exercise__question pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
  overflow-x: auto;
}

.exercise__code {
  font-family: "Fira Code", "Consolas", "Monaco", monospace;
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--color-amber);
  white-space: pre;
}

.exercise__blank {
  color: var(--color-amber);
  font-weight: 800;
  border-bottom: 3px solid var(--color-amber);
  padding: 0 var(--space-xs);
}

.exercise__image {
  margin-bottom: var(--space-lg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.exercise__hint {
  margin-bottom: var(--space-lg);
}

.exercise__hint-btn {
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-amber);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  cursor: pointer;
  list-style: none;
}

.exercise__hint-btn::-webkit-details-marker {
  display: none;
}

.exercise__hint-text {
  margin-top: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-base);
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.5;
  background: rgba(245, 158, 11, 0.08);
  border-left: 3px solid var(--color-amber);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.exercise__img {
  border-radius: var(--radius-md);
}

/* TTS (Text-to-Speech) */
.tts__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: var(--space-md);
}

.tts__btn:hover {
  color: white;
  background: rgba(255, 255, 255, 0.15);
}

.tts__btn--inline {
  float: right;
  margin-bottom: 0;
  margin-left: var(--space-sm);
}

.tts__icon {
  font-size: var(--text-sm);
}

.tts--speaking .tts__btn,
.tts--speaking .tts__btn--inline {
  color: var(--color-amber);
  border-color: var(--color-amber);
}

/* Multiple choice options */
.exercise__options {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.exercise__option-form {
  display: contents;
}

.exercise__option-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 56px;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.exercise__option-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-1px);
}

.exercise__option-btn:active {
  transform: translateY(0);
  background: rgba(255, 255, 255, 0.25);
}

/* Fill-in-blank */
.exercise__fill-form {
  width: 100%;
}

.exercise__input-group {
  display: flex;
  gap: var(--space-md);
}

.exercise__text-input {
  flex: 1;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink);
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.exercise__text-input:focus {
  border-color: var(--color-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
}

.exercise__text-input::placeholder {
  color: var(--color-ink-muted);
  font-weight: 400;
}

.exercise__submit-btn {
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: white;
  background: var(--color-amber);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.exercise__submit-btn:hover:not(:disabled) {
  background: var(--color-amber-light);
  transform: translateY(-1px);
}

.exercise__submit-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

@media (min-width: 768px) {
  .exercise__options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }
}

/* ==========================================================================
   EXERCISE FEEDBACK
   ========================================================================== */
.exercise-feedback {
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  animation: fadeInUp 0.3s ease;
}

.exercise-feedback--correct {
  background: rgba(22, 163, 74, 0.15);
  border: 2px solid rgba(22, 163, 74, 0.3);
  animation: fadeInUp 0.3s ease, pulse-correct 0.6s ease;
}

.exercise-feedback--wrong {
  background: rgba(220, 38, 38, 0.12);
  border: 2px solid rgba(220, 38, 38, 0.25);
  animation: fadeInUp 0.3s ease, shake 0.4s ease;
}

.exercise-feedback__status {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.exercise-feedback--correct .exercise-feedback__status {
  color: var(--color-correct-border);
}

.exercise-feedback--wrong .exercise-feedback__status {
  color: var(--color-wrong-border);
}

.exercise-feedback__question {
  font-size: var(--text-base);
  opacity: 0.8;
  margin-bottom: var(--space-md);
}

.exercise-feedback__correct-answer {
  font-weight: 700;
  color: var(--color-amber);
  margin-bottom: var(--space-sm);
}

.exercise-feedback__explanation {
  font-size: var(--text-sm);
  opacity: 0.75;
  line-height: 1.5;
  margin-bottom: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.exercise-feedback__next-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-2xl);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-blueprint-dark);
  background: var(--color-amber);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.exercise-feedback__next-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.4);
  color: var(--color-blueprint-dark);
}

/* ==========================================================================
   ASSIGNMENT SUMMARY
   ========================================================================== */
.assignment-summary {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 2px solid rgba(22, 163, 74, 0.3);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  animation: scaleIn 0.5s ease;
}

.assignment-summary__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-correct-border);
  margin-bottom: var(--space-xl);
}

.assignment-summary__score {
  margin-bottom: var(--space-lg);
}

.assignment-summary__score-value {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 900;
  color: var(--color-amber);
  animation: countUp 0.5s ease 0.3s both;
}

.assignment-summary__score-total {
  font-size: var(--text-xl);
  opacity: 0.6;
  margin-left: var(--space-sm);
}

.assignment-summary__streak {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-amber);
  margin-bottom: var(--space-xl);
  animation: countUp 0.5s ease 0.5s both;
}

.assignment-summary__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-2xl);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
  background: var(--color-blueprint-light);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.assignment-summary__btn:hover {
  transform: translateY(-2px);
  color: white;
}

/* ==========================================================================
   AUTH BODY (parent login)
   ========================================================================== */
.auth-body {
  background: var(--color-cream);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.auth-shell {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

/* ==========================================================================
   DASHBOARD (parent)
   ========================================================================== */
.dashboard {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  animation: fadeInUp 0.5s ease;
}

.dashboard__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-blueprint);
  margin-bottom: var(--space-xl);
}

.dashboard__overview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.dashboard__stat {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.dashboard__stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-blueprint);
  line-height: 1.2;
}

.dashboard__stat-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  margin-top: var(--space-xs);
}

.dashboard__section-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}

/* Accuracy bars */
.dashboard__accuracy {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
  box-shadow: var(--shadow-sm);
}

.dashboard__accuracy-item {
  display: grid;
  grid-template-columns: 100px 1fr 48px;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.dashboard__accuracy-item:last-child {
  margin-bottom: 0;
}

.dashboard__accuracy-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
}

.dashboard__accuracy-bar {
  height: 12px;
  background: var(--color-sand);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.dashboard__accuracy-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-blueprint), var(--color-blueprint-light));
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 4px;
}

.dashboard__accuracy-value {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-blueprint);
  text-align: right;
}

/* Calendar grid */
.dashboard__calendar {
  margin-bottom: var(--space-2xl);
}

.dashboard__calendar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: var(--space-sm);
}

.dashboard__calendar-day {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
}

.dashboard__calendar-day--completed {
  background: var(--color-correct-bg);
  border-color: var(--color-correct-border);
}

.dashboard__calendar-day--in_progress {
  background: #fffbeb;
  border-color: var(--color-amber);
}

.dashboard__calendar-date {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-ink-light);
}

.dashboard__calendar-score {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-correct);
  margin-top: var(--space-xs);
}

.dashboard__calendar-status {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin-top: var(--space-xs);
}

.dashboard__empty {
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  text-align: center;
  padding: var(--space-xl);
}

/* Actions */
.dashboard__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.dashboard__edit-btn,
.dashboard__pin-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.dashboard__edit-btn {
  color: white;
  background: var(--color-blueprint);
}

.dashboard__edit-btn:hover {
  background: var(--color-blueprint-light);
  color: white;
}

.dashboard__pin-link {
  color: var(--color-blueprint);
  background: var(--color-sand);
  border: 1px solid var(--color-border);
}

.dashboard__pin-link:hover {
  background: var(--color-border);
  color: var(--color-blueprint);
}

@media (max-width: 599px) {
  .dashboard__overview {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   ACCOUNT SETTINGS
   ========================================================================== */
.account {
  max-width: 480px;
  margin: var(--space-xl) auto;
  padding: 0 var(--space-lg);
}

.account__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}

.account__info {
  margin-bottom: var(--space-xl);
}

.account__email {
  font-size: var(--text-base);
  color: var(--color-ink-light);
}

.account__section-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-ink);
  margin-bottom: var(--space-md);
}

.account__errors {
  background: var(--color-wrong-bg, #fef2f2);
  border: 1px solid var(--color-wrong, #ef4444);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.account__error {
  color: var(--color-wrong, #ef4444);
  font-size: var(--text-sm);
  margin: 0;
}

.account__notice {
  background: var(--color-correct-bg, #f0fdf4);
  border: 1px solid var(--color-correct, #22c55e);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.account__notice p {
  color: var(--color-correct, #22c55e);
  font-size: var(--text-sm);
  margin: 0;
}

.account__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.account__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.account__label {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
}

.account__input {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-family: var(--font-body);
  background: white;
  transition: border-color var(--transition-fast);
}

.account__input:focus {
  outline: none;
  border-color: var(--color-blueprint);
}

.account__hint {
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  margin: 0;
}

.account__actions {
  margin-top: var(--space-md);
}

.account__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: white;
  background: var(--color-blueprint);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.account__submit:hover {
  background: var(--color-blueprint-light);
}

.account__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.account__back-link {
  font-size: var(--text-sm);
  color: var(--color-blueprint);
  text-decoration: none;
}

.account__back-link:hover {
  text-decoration: underline;
}

.account__sign-out {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-wrong, #ef4444);
  background: transparent;
  border: 1px solid var(--color-wrong, #ef4444);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.account__sign-out:hover {
  background: var(--color-wrong, #ef4444);
  color: white;
}

/* ==========================================================================
   CHILDREN FORM (parent creates child)
   ========================================================================== */
.children-form {
  max-width: 480px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.children-form__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-blueprint);
  margin-bottom: var(--space-xl);
}

.children-form__errors {
  background: var(--color-wrong-bg);
  border: 1px solid var(--color-wrong-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-lg);
  color: var(--color-wrong);
  font-size: var(--text-sm);
}

.children-form__form {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.children-form__field {
  margin-bottom: var(--space-lg);
}

.children-form__label {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.children-form__input {
  display: block;
  width: 100%;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-ink);
  background: var(--color-cream);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.children-form__input:focus {
  border-color: var(--color-blueprint);
  box-shadow: 0 0 0 4px rgba(27, 58, 92, 0.1);
  background: white;
}

.children-form__actions {
  margin-top: var(--space-xl);
}

.children-form__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
  background: var(--color-blueprint);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.children-form__submit:hover {
  background: var(--color-blueprint-light);
  transform: translateY(-1px);
}

/* ==========================================================================
   Matching Exercise
   ========================================================================== */

.matching__columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.matching__column {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.matching__item {
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  min-height: 60px;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.matching__item:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.4);
}

.matching__item--selected {
  background: rgba(245, 158, 11, 0.3);
  border-color: var(--color-amber);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

.matching__item--paired {
  background: rgba(22, 163, 74, 0.2);
  border-color: var(--color-correct);
  opacity: 0.6;
  cursor: pointer;
  cursor: default;
}

.matching__pairs-display {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  min-height: var(--space-xl);
}

.matching__pair {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.matching__pair:hover {
  background: rgba(220, 38, 38, 0.15);
}

.matching__pair-left,
.matching__pair-right {
  font-size: var(--text-base);
  font-weight: 600;
  color: white;
}

.matching__pair-arrow {
  color: var(--color-amber);
  font-weight: 700;
}

.matching__pair-remove {
  margin-left: auto;
  color: var(--color-wrong);
  font-weight: 700;
  font-size: var(--text-sm);
}

.matching__form {
  display: flex;
  justify-content: center;
}

/* ==========================================================================
   Ordering Exercise
   ========================================================================== */

.ordering__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.ordering__item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  min-height: 80px;
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  touch-action: pan-x;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
}

.ordering__step-number {
  font-weight: 700;
  font-size: 1.2rem;
  min-width: 1.5em;
  color: rgba(255, 255, 255, 0.6);
}

.ordering__item--dragging {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--color-amber);
  box-shadow: var(--shadow-lg);
  opacity: 0.9;
  cursor: grabbing;
  z-index: 10;
  transition: none;
}

.ordering__drag-handle {
  font-size: var(--text-xl);
  color: rgba(255, 255, 255, 0.3);
  cursor: grab;
  line-height: 1;
  touch-action: none;
}

.ordering__item--dragging .ordering__drag-handle {
  color: var(--color-amber);
  cursor: grabbing;
}

.ordering__item-controls {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-left: auto;
}

.ordering__move-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 28px;
  font-size: var(--text-sm);
  color: white;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ordering__move-btn:hover {
  background: var(--color-amber);
  border-color: var(--color-amber);
}

.ordering__move-btn:active {
  transform: scale(0.95);
}

.ordering__item-text {
  flex: 1;
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
}

.ordering__form {
  display: flex;
  justify-content: center;
}

/* ==========================================================================
   Open Question Exercise
   ========================================================================== */

.open-question__answer-area {
  margin-bottom: var(--space-lg);
}

.open-question__textarea {
  width: 100%;
  min-height: 100px;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink);
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  resize: vertical;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.open-question__textarea:focus {
  border-color: var(--color-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
}

.open-question__textarea::placeholder {
  color: var(--color-ink-muted);
  font-weight: 400;
}

.open-question__loading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
}

.open-question__loading-text {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  font-weight: 600;
}

.exercise-feedback__ai-feedback {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-amber);
  margin-bottom: var(--space-md);
  padding: var(--space-md);
  background: rgba(245, 158, 11, 0.1);
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Feedback — Pairs & Order lists
   ========================================================================== */

.exercise-feedback__pairs-list {
  list-style: none;
  padding: 0;
  margin: var(--space-sm) 0 0 0;
}

.exercise-feedback__pairs-list li {
  padding: var(--space-xs) 0;
  font-weight: 600;
}

.exercise-feedback__order-list {
  padding-left: var(--space-lg);
  margin: var(--space-sm) 0 0 0;
}

.exercise-feedback__order-list li {
  padding: var(--space-xs) 0;
  font-weight: 600;
}

.exercise-feedback__order-item--wrong {
  color: var(--color-error, #e74c3c);
  text-decoration: line-through;
}

/* ==========================================================================
   Graduation Certificate
   ========================================================================== */

.graduation {
  display: flex;
  justify-content: center;
  padding: var(--space-xl);
}

.graduation__certificate {
  text-align: center;
  padding: var(--space-3xl) var(--space-2xl);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(194, 65, 12, 0.1));
  border: 3px solid var(--color-amber);
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 100%;
}

.graduation__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-amber);
  margin-bottom: var(--space-sm);
}

.graduation__subtitle {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-xl);
}

.graduation__body {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
  margin-bottom: var(--space-2xl);
}

.graduation__badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-2xl);
  background: rgba(245, 158, 11, 0.2);
  border: 2px solid var(--color-amber);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-2xl);
}

.graduation__badge-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-amber);
}

.graduation__badge-subtitle {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
  font-style: italic;
}

.graduation__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.graduation__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.graduation__stat-value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: white;
}

.graduation__stat-label {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  font-weight: 600;
}

/* ==========================================================================
   Subject Picker
   ========================================================================== */

.subject-picker {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.subject-picker__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-md);
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: all var(--transition-fast);
  text-align: center;
}

.subject-picker__card:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.subject-picker__card--completed {
  background: rgba(22, 163, 74, 0.15);
  border-color: rgba(22, 163, 74, 0.3);
}

.subject-picker__card--completed:hover {
  background: rgba(22, 163, 74, 0.25);
}

.subject-picker__card--in-progress {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.3);
}

.subject-picker__icon {
  font-size: var(--text-3xl);
}

.subject-picker__name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: white;
}

.subject-picker__progress {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
}

.subject-picker__card--completed .subject-picker__progress {
  color: var(--color-correct-border);
  font-size: var(--text-lg);
}

@media (min-width: 768px) {
  .subject-picker {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* Assignment mascot link */
.assignment__mascot {
  text-align: center;
  margin-top: var(--space-lg);
}

.assignment__mascot-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: white;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.assignment__mascot-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: white;
}

/* ==========================================================================
   Subject Page
   ========================================================================== */

.subject-page {
  animation: fadeInUp 0.4s ease;
}

/* Two-column layout on wide screens (iPad landscape+) */
@media (min-width: 1024px) {
  .subject-page {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
  }

  .subject-page__content {
    flex: 1;
    min-width: 0;
  }

  .subject-page__chat {
    width: 340px;
    flex-shrink: 0;
    position: sticky;
    top: var(--space-md);
    max-height: calc(100vh - var(--space-xl));
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .subject-page__chat--collapsed {
    display: none;
  }

  .subject-page__chat-close {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--text-lg);
    cursor: pointer;
    z-index: 2;
    padding: var(--space-xs);
    line-height: 1;
  }

  .subject-page__chat-close:hover {
    color: white;
  }

  .subject-page__chat-toggle--mobile {
    display: none;
  }

  .chat--inline {
    height: 100%;
    max-height: calc(100vh - var(--space-xl));
  }

  .chat--inline .chat__messages {
    flex: 1;
    overflow-y: auto;
    max-height: none;
  }

  .chat--inline .chat__input-row {
    flex-direction: column;
  }

  .chat--inline .chat__send-btn {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
  }
}

.chat__loading-placeholder {
  padding: var(--space-lg);
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

/* Narrow screens: hide sidebar, show mobile toggle button */
@media (max-width: 1023px) {
  .subject-page__chat {
    display: none;
  }

  .subject-page__chat-close {
    display: none;
  }

  .subject-page__chat-toggle--mobile {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: 700;
    color: white;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
  }

  .subject-page__chat-toggle--mobile:hover {
    background: rgba(255, 255, 255, 0.12);
  }
}

/* FAB button — visible only when panel is collapsed on wide screens */
.archik-fab {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-amber);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  cursor: pointer;
  z-index: 40;
  transition: transform var(--transition-fast);
}

.archik-fab:hover {
  transform: scale(1.1);
}

@media (max-width: 1023px) {
  .archik-fab {
    display: none;
  }
}

.subject-page__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.subject-page__icon {
  font-size: var(--text-2xl);
}

.subject-page__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: white;
}

.subject-page__progress {
  margin-left: auto;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  font-weight: 600;
}

.subject-page__exercises {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.subject-page__done {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  background: rgba(22, 163, 74, 0.15);
  border: 2px solid rgba(22, 163, 74, 0.3);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-xl);
  animation: scaleIn 0.4s ease;
}

.subject-page__done-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-correct-border);
  margin-bottom: var(--space-lg);
}

.subject-page__back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-2xl);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-blueprint-dark);
  background: var(--color-amber);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.subject-page__back-btn:hover {
  transform: translateY(-2px);
  color: var(--color-blueprint-dark);
}

.subject-page__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.subject-page__nav-btn {
  display: inline-flex;
  align-items: center;
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.subject-page__nav-btn:hover {
  color: white;
}

/* ==========================================================================
   Lesson Page
   ========================================================================== */

.lesson {
  max-width: 720px;
  margin: 0 auto;
  animation: fadeInUp 0.5s ease;
}

.lesson__header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.lesson__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: white;
}

.lesson__content {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-xl) var(--space-2xl);
  margin-bottom: var(--space-2xl);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.7;
}

.lesson__content h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-amber);
  margin-bottom: var(--space-md);
}

.lesson__content h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: white;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.lesson__content h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-amber-light);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.lesson__content p {
  margin-bottom: var(--space-md);
}

.lesson__content em {
  color: rgba(255, 255, 255, 0.7);
  font-style: italic;
}

.lesson__content strong {
  color: white;
  font-weight: 700;
}

.lesson__content ul,
.lesson__content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

.lesson__content li {
  margin-bottom: var(--space-xs);
}

.lesson__content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  font-size: var(--text-sm);
}

.lesson__content th,
.lesson__content td {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid rgba(255, 255, 255, 0.15);
  text-align: left;
}

.lesson__content th {
  background: rgba(255, 255, 255, 0.08);
  font-weight: 700;
  color: white;
}

.lesson__content code {
  background: rgba(0, 0, 0, 0.3);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: var(--text-sm);
  color: var(--color-amber-light);
}

.lesson__content pre {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  overflow-x: auto;
}

.lesson__content pre code {
  background: none;
  padding: 0;
  color: rgba(255, 255, 255, 0.85);
}

.lesson__content hr {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin: var(--space-2xl) 0;
}

.lesson__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  position: sticky;
  bottom: var(--space-lg);
  padding: var(--space-lg);
  background: rgba(15, 36, 64, 0.9);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.lesson__start-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 56px;
  padding: var(--space-md) var(--space-2xl);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-blueprint-dark);
  background: var(--color-amber);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.lesson__start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

.lesson__chat-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: white;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.lesson__chat-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: white;
}

@media (min-width: 768px) {
  .lesson__actions {
    flex-direction: row;
    justify-content: center;
  }

  .lesson__start-btn {
    width: auto;
  }
}

/* ==========================================================================
   Chat with Архик (Mascot)
   ========================================================================== */

.chat {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  width: 100%;
  box-sizing: border-box;
}

.chat__header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.chat__avatar {
  font-size: var(--text-2xl);
}

.chat__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: white;
}

.chat__new-btn {
  margin-left: auto;
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chat__new-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: white;
}

.chat__counter {
  margin-left: auto;
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.5);
  font-weight: 600;
}

.chat__messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  scroll-behavior: smooth;
}

.chat__message {
  display: flex;
  gap: var(--space-sm);
  max-width: 85%;
  animation: fadeInUp 0.3s ease;
}

.chat__message--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat__message--assistant {
  align-self: flex-start;
}

.chat__bubble-avatar {
  font-size: var(--text-lg);
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat__bubble {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  line-height: 1.5;
  font-weight: 600;
  max-width: 85%;
  word-wrap: break-word;
}

.chat__bubble p:first-child { margin-top: 0; }
.chat__bubble p:last-child { margin-bottom: 0; }

.chat__message--assistant .chat__bubble {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: white;
  border-top-left-radius: var(--radius-sm);
}

.chat__message--user .chat__bubble {
  background: var(--color-amber);
  color: var(--color-blueprint-dark);
  border-top-right-radius: var(--radius-sm);
}

/* Typing indicator */
.chat__loading {
  display: flex;
  gap: var(--space-sm);
  align-self: flex-start;
  padding: var(--space-sm) 0;
}

.chat__loading--hidden {
  display: none;
}

.chat__bubble--typing {
  display: flex;
  gap: 6px;
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  border-top-left-radius: var(--radius-sm);
}

.chat__dot {
  width: 8px;
  height: 8px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  animation: chatDotBounce 1.4s infinite ease-in-out;
}

.chat__dot:nth-child(2) { animation-delay: 0.2s; }
.chat__dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes chatDotBounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

/* Input area */
.chat__input-area {
  flex-shrink: 0;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.chat__input-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

@media (max-width: 480px) {
  .chat__input-row {
    flex-direction: column;
  }

  .chat__send-btn {
    width: 100%;
  }
}

.chat__text-input {
  flex: 1;
  min-width: 0;
  min-height: 52px;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-ink);
  background: white;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.chat__text-input:focus {
  border-color: var(--color-amber);
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
}

.chat__text-input::placeholder {
  color: var(--color-ink-muted);
  font-weight: 400;
}

.chat__text-input:disabled {
  opacity: 0.5;
}

.chat__send-btn {
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-blueprint-dark);
  background: var(--color-amber);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.chat__send-btn:hover:not(:disabled) {
  background: var(--color-amber-light);
  transform: translateY(-1px);
}

.chat__send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Limit reached */
.chat__limit {
  text-align: center;
  padding: var(--space-xl);
}

.chat__limit-text {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-lg);
}

.chat__limit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap-target);
  padding: var(--space-md) var(--space-2xl);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: white;
  background: var(--color-blueprint-light);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.chat__limit-btn:hover {
  transform: translateY(-2px);
  color: white;
}

/* Voice chat controls */
.voice-chat {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding-left: var(--space-sm);
}

.voice-chat__button {
  width: var(--tap-target);
  height: var(--tap-target);
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  font-size: var(--text-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.voice-chat__button:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-amber);
  transform: scale(1.05);
}

.voice-chat__button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

[data-voice-chat-state="listening"] .voice-chat__button {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  animation: voicePulse 1.5s ease-in-out infinite;
}

[data-voice-chat-state="speaking"] .voice-chat__button {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--color-amber);
  animation: voicePulse 1s ease-in-out infinite;
}

.voice-chat__status {
  font-size: var(--text-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  white-space: nowrap;
}

.voice-chat__timer {
  font-size: var(--text-xs);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.5);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

@keyframes voicePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.3); }
  50% { box-shadow: 0 0 0 8px rgba(239, 68, 68, 0); }
}

/* English voice chat section */
.english-voice-chat {
  background: rgba(255, 255, 255, 0.06);
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.english-voice-chat__header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.english-voice-chat__avatar {
  font-size: 2rem;
}

.english-voice-chat__name {
  font-size: var(--text-lg);
  font-weight: 700;
}

.english-voice-chat__desc {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-md);
}

.english-voice-chat__controls {
  display: flex;
  justify-content: center;
}

.english-voice-chat__controls .voice-chat {
  gap: var(--space-md);
}

.english-voice-chat__controls .voice-chat__button {
  width: 64px;
  height: 64px;
  font-size: 1.8rem;
}

/* Home screen mascot button */
.learn-home__mascot {
  margin-top: var(--space-2xl);
  text-align: center;
}

.learn-home__mascot-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.learn-home__mascot-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.learn-home__mascot-avatar {
  font-size: var(--text-2xl);
}

.learn-home__mascot-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
}

/* ==========================================================================
   Diglot Weaving — inline English words with translation tooltips
   ========================================================================== */

.diglot__word {
  color: var(--color-amber-light);
  font-weight: 600;
  cursor: pointer;
  border-bottom: 1px dotted var(--color-amber);
  position: relative;
  outline: none;
}

.diglot__word::after {
  content: attr(data-translation);
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-paper);
  color: var(--color-ink);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast);
  pointer-events: none;
  z-index: 100;
}

.diglot__word:hover::after,
.diglot__word:focus::after {
  opacity: 1;
  visibility: visible;
}