/* ── Tokens ─────────────────────────────────────────────────── */
:root {
  --bg:           #FAF7F2;
  --surface:      #FFFFFF;
  --surface-2:    #F2ECE2;
  --border:       #E5DDD0;
  --text:         #1C1309;
  --text-muted:   #7C6957;
  --text-faint:   #B5A898;
  --primary:      #C24B23;
  --primary-dark: #9E3B1A;
  --amber:        #E8A01F;
  --success:      #2D7D5A;
  --success-bg:   #E8F5EE;
  --danger:       #C24B23;
  --danger-bg:    #FDEEEA;
  --nav-bg:       #1C1309;
  --nav-h:        72px;
  --radius:       16px;
  --radius-sm:    10px;
  --shadow:       0 4px 24px rgba(28,19,9,0.10);
  --shadow-lg:    0 12px 48px rgba(28,19,9,0.18);
  --font-ui:      'Outfit', system-ui, sans-serif;
  --font-es:      'Cormorant', Georgia, serif;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; -webkit-text-size-adjust: 100%; }
body {
  height: 100%;
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

/* ── Layout ─────────────────────────────────────────────────── */
#app {
  min-height: 100dvh;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom));
  overflow-y: auto;
}

/* ── Bottom nav ─────────────────────────────────────────────── */
#bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--nav-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--nav-bg);
  display: flex;
  align-items: flex-start;
  padding-top: 10px;
  z-index: 100;
}
.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 4px;
  background: none;
  border: none;
  color: #8B7355;
  cursor: pointer;
  transition: color 0.2s;
  font-family: var(--font-ui);
}
.nav-btn svg { width: 22px; height: 22px; }
.nav-btn span { font-size: 10px; font-weight: 500; letter-spacing: 0.02em; }
.nav-btn.active { color: var(--amber); }
.nav-btn:active { opacity: 0.7; }

/* ── Loading ─────────────────────────────────────────────────── */
.loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100dvh;
}
.loading-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-es {
  font-family: var(--font-es);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}
.loading-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  animation: pulse 1.2s ease-in-out infinite;
}
.loading-dot:nth-child(2) { animation-delay: 0.2s; }
.loading-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse {
  0%, 100% { opacity: 0.2; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1); }
}

/* ── Screen header ──────────────────────────────────────────── */
.screen-header {
  padding: 20px 20px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
  padding-top: calc(20px + env(safe-area-inset-top));
}
.screen-title {
  font-family: var(--font-es);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  flex: 1;
}
.back-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface-2);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s;
}
.back-btn:active { background: var(--border); }
.back-btn svg { width: 18px; height: 18px; color: var(--text); }

/* ── Shared card ────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

/* ── Pill / badge ───────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge-mastered { background: #E8F5EE; color: var(--success); }
.badge-progress { background: #FEF3CD; color: #92620E; }
.badge-locked   { background: var(--surface-2); color: var(--text-faint); }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.15s, opacity 0.15s;
  text-align: center;
}
.btn:active { transform: scale(0.97); opacity: 0.9; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { background: var(--surface-2); }
.btn-success { background: var(--success); color: #fff; }
.btn-full { width: 100%; }
.btn-lg { padding: 17px 28px; font-size: 1.05rem; }

/* ── Progress bar ───────────────────────────────────────────── */
.prog-track {
  height: 6px;
  background: var(--surface-2);
  border-radius: 100px;
  overflow: hidden;
}
.prog-fill {
  height: 100%;
  border-radius: 100px;
  background: var(--primary);
  transition: width 0.4s ease;
}
.prog-fill.full { background: var(--success); }

/* ══════════════════════════════════════════════════════════════
   HOME SCREEN
══════════════════════════════════════════════════════════════ */
.home-hero {
  margin: 20px 20px 0;
  background: var(--nav-bg);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
  overflow: hidden;
}
.home-hero::before {
  content: 'ES';
  position: absolute;
  right: -10px;
  top: -20px;
  font-family: var(--font-es);
  font-size: 120px;
  font-weight: 700;
  color: rgba(255,255,255,0.04);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}
.home-hero-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 6px;
}
.home-hero-title {
  font-family: var(--font-es);
  font-size: 2.2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 20px;
}
.home-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
.home-stat {
  background: rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}
.home-stat-value {
  font-family: var(--font-es);
  font-size: 2rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
}
.home-stat-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
}
.home-continue {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--primary);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  cursor: pointer;
  border: none;
  width: 100%;
  font-family: var(--font-ui);
  transition: background 0.2s, transform 0.15s;
}
.home-continue:active { transform: scale(0.98); }
.home-continue:hover { background: var(--primary-dark); }
.home-continue-text {
  text-align: left;
}
.home-continue-eyebrow {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  display: block;
}
.home-continue-name {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  display: block;
}
.home-continue-arrow {
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.home-continue-arrow svg { width: 16px; height: 16px; color: #fff; }

/* Week sections */
.section-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 24px 20px 10px;
}
.lesson-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
  text-decoration: none;
}
.lesson-row:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.lesson-row:last-child  { border-radius: 0 0 var(--radius) var(--radius); border-bottom: none; }
.lesson-row:only-child  { border-radius: var(--radius); }
.lesson-row:active { background: var(--surface-2); }
.lesson-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}
.lesson-num.mastered { background: var(--success-bg); color: var(--success); }
.lesson-info { flex: 1; min-width: 0; }
.lesson-name { font-size: 0.95rem; font-weight: 500; color: var(--text); }
.lesson-meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.lesson-score {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
}
.lesson-score.good { color: var(--success); }

.week-group {
  margin: 0 20px 4px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

/* ══════════════════════════════════════════════════════════════
   FLASHCARD SCREEN
══════════════════════════════════════════════════════════════ */
.fc-layout {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom) + 20px);
}
.fc-progress-bar {
  height: 3px;
  background: var(--surface-2);
  position: relative;
}
.fc-progress-fill {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  background: var(--primary);
  transition: width 0.3s ease;
}
.fc-counter {
  padding: 12px 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.fc-counter-text {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}
.fc-counter-score {
  display: flex;
  gap: 12px;
  font-size: 13px;
  font-weight: 600;
}
.fc-score-good { color: var(--success); }
.fc-score-again { color: var(--primary); }

/* The flip card */
.fc-stage {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 16px 20px;
}
.flip-wrapper {
  width: 100%;
  perspective: 1200px;
}
.flip-card {
  width: 100%;
  height: 280px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}
.flip-card.is-flipped { transform: rotateY(180deg); }
.flip-face {
  position: absolute;
  inset: 0;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  text-align: center;
}
.flip-face-back { transform: rotateY(180deg); }

/* Front face content */
.fc-lang-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.fc-word-en {
  font-size: 2rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 8px;
}
.fc-tap-hint {
  font-size: 12px;
  color: var(--text-faint);
  margin-top: 16px;
}

/* Back face content */
.fc-word-es {
  font-family: var(--font-es);
  font-size: 3rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 4px;
}
.fc-ipa {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 16px;
}
.fc-example {
  font-family: var(--font-es);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.4;
}
.fc-example-en {
  font-size: 12px;
  color: var(--text-faint);
  margin-top: 4px;
}

/* Action area — single "don't know" button shown before flip */
.fc-actions {
  padding: 0 20px 16px;
}
.fc-btn-again {
  width: 100%;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-muted);
  border: 1.5px solid var(--border);
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, color 0.15s;
}
.fc-btn-again:hover  { background: var(--danger-bg); color: var(--danger); border-color: #F0C4BA; }
.fc-btn-again:active { transform: scale(0.97); }

/* Back-face feedback after answering */
.fc-face-correct {
  background: #F0FAF5 !important;
  animation: flash-correct 0.35s ease;
}
.fc-face-wrong {
  background: var(--danger-bg) !important;
}
@keyframes flash-correct {
  0%   { background: #d4f0e0; }
  100% { background: #F0FAF5; }
}

/* Results / lesson picker shared */
.picker-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding: 16px 20px;
}
.picker-tile {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 16px;
  cursor: pointer;
  border: 1.5px solid var(--border);
  transition: border-color 0.2s, transform 0.15s;
}
.picker-tile:active { transform: scale(0.97); }
.picker-tile.is-mastered { border-color: var(--success); }
.picker-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 4px;
}
.picker-name {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}
.picker-words {
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 6px;
}
.picker-status { margin-top: 6px; }

/* End-of-deck screen */
.result-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px 20px;
  text-align: center;
  gap: 16px;
}
.result-score-ring {
  width: 120px;
  height: 120px;
}
.result-score-ring circle {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
  transform-origin: 50% 50%;
}
.ring-track { stroke: var(--surface-2); }
.ring-fill {
  stroke: var(--success);
  transform: rotate(-90deg);
  transition: stroke-dashoffset 0.8s ease;
}
.result-pct {
  font-family: var(--font-es);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--text);
}
.result-label {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
}
.result-sub {
  font-size: 0.9rem;
  color: var(--text-muted);
}
.result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
  margin-top: 8px;
}

/* ══════════════════════════════════════════════════════════════
   QUIZ SCREEN
══════════════════════════════════════════════════════════════ */
.quiz-layout {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom) + 20px);
}
.quiz-q-area {
  padding: 24px 20px;
  text-align: center;
}
.quiz-prompt {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.quiz-word {
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
}
.quiz-hint {
  font-size: 13px;
  color: var(--text-faint);
  margin-top: 8px;
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 20px;
}
.quiz-opt {
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1.5px solid var(--border);
  font-family: var(--font-es);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.quiz-opt:active { transform: scale(0.98); }
.quiz-opt.correct {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--success);
}
.quiz-opt.wrong {
  background: var(--danger-bg);
  border-color: var(--danger);
  color: var(--danger);
}
.quiz-opt.reveal-correct {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--success);
  animation: pop 0.3s ease;
}
.quiz-opt svg { width: 20px; height: 20px; flex-shrink: 0; }
@keyframes pop {
  0% { transform: scale(0.97); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

/* ══════════════════════════════════════════════════════════════
   LESSONS SCREEN
══════════════════════════════════════════════════════════════ */
.lesson-detail {
  padding: 0 20px 24px;
}
.lesson-detail-hero {
  background: var(--nav-bg);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}
.lesson-detail-hero::after {
  content: attr(data-num);
  position: absolute;
  right: -8px;
  bottom: -20px;
  font-family: var(--font-es);
  font-size: 100px;
  font-weight: 700;
  color: rgba(255,255,255,0.04);
  line-height: 1;
  pointer-events: none;
}
.lesson-detail-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 4px;
}
.lesson-detail-title {
  font-family: var(--font-es);
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}
.lesson-detail-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 24px;
}

/* Vocab table */
.vocab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.vocab-table th {
  text-align: left;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0 0 8px;
  border-bottom: 1px solid var(--border);
}
.vocab-table td {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.vocab-table tr:last-child td { border-bottom: none; }
.vocab-es {
  font-family: var(--font-es);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  padding-right: 12px;
  white-space: nowrap;
}
.vocab-ipa {
  font-size: 11px;
  color: var(--text-faint);
}
.vocab-en { color: var(--text-muted); }

/* Misc utility */
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.text-center { text-align: center; }
.px-20 { padding-left: 20px; padding-right: 20px; }
.py-32 {
  padding-top: 32px;
  padding-bottom: 32px;
}
.gap-10 { gap: 10px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }