/* Neft Teacher · Vocabulary Study Hub
   Student-facing, bilingual, ESOL-first: big, simple, visual.
   Dark-mode aware, WCAG-AA contrast, prefers-reduced-motion honored. */

:root {
  --bg: #f4f7fd;
  --surface: #ffffff;
  --surface-2: #eef2fb;
  --ink: #14203a;
  --ink-soft: #475069;
  --primary: #1d3a8a;
  --primary-ink: #ffffff;
  --accent: #0e7a5f;
  --accent-2: #b4480d;
  --es: #6a2bb0;
  --border: #d3dbec;
  --good: #0e7a5f;
  --bad: #b4231a;
  --star: #d99100;
  --shadow: 0 2px 10px rgba(20, 32, 58, 0.1);
  --radius: 16px;
  --tap: 44px;
}

[data-theme="dark"] {
  --bg: #0f1626;
  --surface: #182236;
  --surface-2: #202c45;
  --ink: #eef2fb;
  --ink-soft: #aeb9d4;
  --primary: #6f9bff;
  --primary-ink: #0f1626;
  --accent: #4fd1a6;
  --accent-2: #ffae6b;
  --es: #c79bff;
  --border: #2c3a59;
  --good: #4fd1a6;
  --bad: #ff8a80;
  --star: #ffd166;
  --shadow: 0 2px 14px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--primary);
  color: var(--primary-ink);
  padding: 10px 16px;
  border-radius: 8px;
  z-index: 100;
}
.skip-link:focus {
  left: 8px;
}

:focus-visible {
  outline: 3px solid var(--accent-2);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- Header ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px clamp(12px, 3vw, 28px);
  background: var(--primary);
  color: var(--primary-ink);
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  font-size: 1.8rem;
}
.brand-text {
  display: flex;
  flex-direction: column;
}
.brand-title {
  font-weight: 800;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  margin: 0;
}
.brand-sub {
  font-size: 0.8rem;
  opacity: 0.9;
}
.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}
.lang-toggle {
  display: inline-flex;
  background: rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  padding: 3px;
}
.lang-btn {
  border: 0;
  background: transparent;
  color: var(--primary-ink);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 6px 12px;
  min-height: var(--tap);
  border-radius: 999px;
  cursor: pointer;
}
.lang-btn.is-active {
  background: var(--primary-ink);
  color: var(--primary);
}
.icon-btn {
  border: 0;
  background: rgba(255, 255, 255, 0.16);
  color: var(--primary-ink);
  font-size: 1.25rem;
  width: var(--tap);
  height: var(--tap);
  border-radius: 12px;
  cursor: pointer;
}

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: 6px;
  padding: 10px clamp(8px, 3vw, 28px);
  overflow-x: auto;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.tab {
  flex: 1 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap);
  padding: 8px 14px;
  border: 2px solid transparent;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--ink-soft);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
}
.tab.is-active {
  background: var(--primary);
  color: var(--primary-ink);
}
.tab-emoji {
  font-size: 1.1rem;
}

/* ---------- Main / views ---------- */
main {
  flex: 1;
  padding: clamp(12px, 3vw, 28px);
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  outline: none;
}
.loading {
  text-align: center;
  color: var(--ink-soft);
  padding: 40px 0;
  font-size: 1.1rem;
}

/* ---------- Controls bar ---------- */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
}
.search {
  flex: 1 1 220px;
  min-height: var(--tap);
  padding: 10px 14px;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
}
.select {
  min-height: var(--tap);
  padding: 8px 12px;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
}
.count-pill {
  margin-left: auto;
  background: var(--surface-2);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 6px 14px;
  font-weight: 700;
  font-size: 0.9rem;
}

/* ---------- Buttons ---------- */
.btn {
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
  font-size: 1rem;
  min-height: var(--tap);
  padding: 10px 18px;
  border-radius: 12px;
  cursor: pointer;
}
.btn:hover {
  border-color: var(--primary);
}
.btn-primary {
  background: var(--primary);
  color: var(--primary-ink);
  border-color: var(--primary);
}
.btn-good {
  background: var(--good);
  color: #fff;
  border-color: var(--good);
}
.btn-warn {
  background: var(--accent-2);
  color: #fff;
  border-color: var(--accent-2);
}
.btn-ghost {
  background: transparent;
}
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 16px;
}

.say-btn {
  border: 2px solid var(--border);
  background: var(--surface-2);
  color: var(--ink);
  border-radius: 999px;
  min-height: 36px;
  padding: 4px 12px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.say-btn.es {
  color: var(--es);
}

/* ---------- Word wall cards ---------- */
.wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}
.word-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.word-card img {
  width: 100%;
  height: 120px;
  object-fit: contain;
  background: var(--surface-2);
  border-radius: 12px;
  padding: 8px;
}
.term-en {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--ink);
}
.term-es {
  font-weight: 700;
  font-size: 1rem;
  color: var(--es);
}
.def-en {
  font-size: 0.95rem;
  color: var(--ink);
}
.def-es {
  font-size: 0.95rem;
  color: var(--ink-soft);
  font-style: italic;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}
.tag {
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--surface-2);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 3px 9px;
}
.say-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.lang-hide-es .term-es,
.lang-hide-es .def-es,
.lang-hide-es .say-btn.es {
  display: none;
}
.lang-hide-en .term-en,
.lang-hide-en .def-en,
.lang-hide-en .say-btn.en {
  display: none;
}

/* ---------- Flashcards ---------- */
.fc-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.fc-progress {
  width: 100%;
  max-width: 520px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-soft);
  font-weight: 700;
}
.bar {
  flex: 1;
  height: 12px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
}
.bar > span {
  display: block;
  height: 100%;
  background: var(--good);
  width: 0;
  transition: width 0.3s ease;
}
.flashcard {
  width: min(520px, 100%);
  min-height: 320px;
  perspective: 1200px;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}
.fc-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 320px;
  transition: transform 0.5s;
  transform-style: preserve-3d;
}
.flashcard.flipped .fc-inner {
  transform: rotateY(180deg);
}
.fc-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 22px;
  text-align: center;
}
.fc-back {
  transform: rotateY(180deg);
}
.fc-face img {
  height: 120px;
  object-fit: contain;
}
.fc-term {
  font-size: 1.8rem;
  font-weight: 800;
}
.fc-term-es {
  font-size: 1.2rem;
  color: var(--es);
  font-weight: 700;
}
.fc-def {
  font-size: 1.1rem;
}
.fc-def-es {
  font-size: 1rem;
  color: var(--ink-soft);
  font-style: italic;
}
.fc-hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

/* ---------- Matching game ---------- */
.match-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: 820px;
  margin: 0 auto;
}
.match-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.match-item {
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  border-radius: 12px;
  padding: 12px;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  min-height: var(--tap);
  display: flex;
  align-items: center;
  gap: 10px;
}
.match-item img {
  height: 44px;
  width: 44px;
  object-fit: contain;
  flex: none;
}
.match-item.selected {
  border-color: var(--primary);
  background: var(--surface-2);
}
.match-item.matched {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good) 16%, var(--surface));
  cursor: default;
  opacity: 0.7;
}
.match-item.wrong {
  border-color: var(--bad);
  animation: shake 0.3s;
}
.scorebar {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
  margin-bottom: 14px;
  font-weight: 800;
  font-size: 1.1rem;
}
.scorebar .feedback {
  color: var(--good);
  min-height: 1.4em;
}

/* ---------- Quiz ---------- */
.quiz-card {
  max-width: 640px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.quiz-prompt {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 6px;
}
.quiz-prompt-es {
  font-size: 0.95rem;
  color: var(--ink-soft);
  font-style: italic;
  margin: 0 0 14px;
}
.quiz-img {
  height: 110px;
  display: block;
  margin: 0 auto 14px;
  object-fit: contain;
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.quiz-opt {
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  min-height: var(--tap);
}
.quiz-opt:hover {
  border-color: var(--primary);
}
.quiz-opt.correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good) 16%, var(--surface));
}
.quiz-opt.wrong {
  border-color: var(--bad);
  background: color-mix(in srgb, var(--bad) 14%, var(--surface));
}
.quiz-opt:disabled {
  cursor: default;
}
.quiz-feedback {
  margin-top: 14px;
  font-weight: 700;
  min-height: 1.4em;
}
.quiz-feedback.ok {
  color: var(--good);
}
.quiz-feedback.no {
  color: var(--bad);
}

/* ---------- 3D shape viewer ---------- */
.shape-scene {
  display: flex;
  justify-content: center;
  padding: 24px 0;
}
.scene3d {
  width: 160px;
  height: 160px;
  perspective: 600px;
}
.solid {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  animation: spin 14s linear infinite;
}
.solid .face {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--primary) 55%, transparent);
  border: 2px solid var(--primary);
  opacity: 0.92;
}

/* ---------- Empty / star ---------- */
.empty {
  text-align: center;
  color: var(--ink-soft);
  padding: 40px 0;
}
.star {
  color: var(--star);
}
.got-it {
  color: var(--good);
  font-weight: 800;
}

/* ---------- Celebration ---------- */
.celebrate {
  position: fixed;
  inset: 0;
  background: rgba(15, 22, 38, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}
.celebrate-card {
  background: var(--surface);
  border-radius: 20px;
  padding: 28px;
  max-width: 380px;
  text-align: center;
  box-shadow: var(--shadow);
}
.celebrate-emoji {
  font-size: 3rem;
}
.celebrate-card h2 {
  margin: 8px 0;
}

/* ---------- Footer ---------- */
.app-footer {
  text-align: center;
  padding: 16px;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-6px);
  }
  75% {
    transform: translateX(6px);
  }
}
@keyframes spin {
  from {
    transform: rotateX(-20deg) rotateY(0);
  }
  to {
    transform: rotateX(-20deg) rotateY(360deg);
  }
}

@media (max-width: 540px) {
  .match-item img {
    height: 36px;
    width: 36px;
  }
  .tab-label {
    display: none;
  }
  .tab {
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .solid {
    transform: rotateX(-20deg) rotateY(35deg);
  }
}

/* Quest Mode Layout */
.quest-stats {
  display: flex;
  justify-content: space-around;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 16px;
  font-weight: bold;
}
.quest-stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 1.1rem;
}
.quest-shop {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}
.quest-shop-title {
  margin: 0 0 10px;
  font-size: 1.1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}
.quest-shop-items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.quest-shop-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.quest-shop-name {
  font-weight: bold;
  font-size: 0.9rem;
}
.quest-shop-qty {
  font-size: 0.8rem;
  color: var(--ink-soft);
}
.quest-map-panel {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.quest-map-svg {
  width: 100%;
  max-width: 600px;
  height: auto;
  margin: 0 auto;
}
.quest-station {
  cursor: pointer;
}
.quest-station circle {
  transition:
    transform 0.2s ease,
    fill 0.2s ease;
}
.quest-station:hover circle {
  transform: scale(1.1);
  transform-origin: center;
}

/* Powerups Bar in Quiz/Quest */
.powerups-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 14px 0;
  flex-wrap: wrap;
}
.powerup-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
  border: 2px solid var(--border);
  background: var(--surface-2);
  color: var(--ink);
  cursor: pointer;
  min-height: var(--tap);
}
.powerup-btn:hover:not(:disabled) {
  border-color: var(--primary);
  background: var(--surface);
}
.powerup-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Glowing Image for Visual Clue */
.glowing-clue {
  outline: 4px solid var(--star);
  outline-offset: 4px;
  box-shadow: 0 0 20px var(--star);
  transition: all 0.3s ease;
}

/* Printable Certificate styles */
@media print {
  body.print-cert {
    background: #fff !important;
    color: #000 !important;
  }
  .app-header,
  .tabs,
  .app-footer,
  main > :not(.certificate-container) {
    display: none !important;
  }
  main {
    padding: 0 !important;
    margin: 0 !important;
    max-width: 100% !important;
  }
  .certificate-container {
    border: 15px double #1d3a8a !important;
    box-shadow: none !important;
    margin: 0 !important;
    width: 100% !important;
    height: 100% !important;
  }
}
.certificate-container {
  max-width: 650px;
  margin: 20px auto;
  border: 12px double var(--primary);
  background: #fff;
  color: #14203a;
  padding: 40px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  text-align: center;
}