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

:root {
  --navy-900: #0f1b3d;
  --navy-800: #152452;
  --blue-900: #1a365d;
  --blue-800: #1e4d8c;
  --blue-700: #2563eb;
  --blue-600: #3b82f6;
  --blue-500: #60a5fa;
  --blue-100: #dbeafe;
  --blue-50: #eff6ff;
  --red-700: #b91c1c;
  --red-600: #dc2626;
  --red-500: #ef4444;
  --red-100: #fee2e2;
  --green-700: #15803d;
  --green-600: #16a34a;
  --green-500: #22c55e;
  --green-100: #dcfce7;
  --yellow-600: #ca8a04;
  --yellow-500: #eab308;
  --yellow-100: #fef9c3;
  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --gray-50: #f9fafb;
  --white: #ffffff;
  --cream: #fefcf3;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 24px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.06);
  --shadow-blue: 0 4px 14px rgba(37, 99, 235, 0.25);
  --shadow-green: 0 4px 14px rgba(22, 163, 74, 0.2);
  --shadow-red: 0 4px 14px rgba(220, 38, 38, 0.2);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --transition: 0.25s ease;
  --transition-fast: 0.15s ease;
  --gradient-primary: linear-gradient(135deg, var(--blue-700), var(--blue-500));
  --gradient-hero: linear-gradient(160deg, var(--navy-900) 0%, var(--blue-800) 50%, var(--blue-700) 100%);
  --gradient-patriotic: linear-gradient(90deg, var(--blue-700), var(--red-500));
  --gradient-progress: linear-gradient(90deg, var(--blue-600), var(--green-500));
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #f0f2f5;
  background-image: radial-gradient(circle at 1px 1px, rgba(0,0,0,0.03) 1px, transparent 0);
  background-size: 24px 24px;
  color: var(--gray-900);
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  -webkit-tap-highlight-color: transparent;
}

ul {
  list-style: none;
}

/* ===== Patriotic Top Stripe ===== */
.patriotic-stripe {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  height: 4px;
}

.stripe-red {
  flex: 1;
  background: var(--red-600);
}

.stripe-white {
  flex: 1;
  background: var(--white);
}

.stripe-blue {
  flex: 1;
  background: var(--blue-700);
}

/* ===== App Shell ===== */
#app {
  max-width: 600px;
  margin: 0 auto;
  padding: 4px 16px 0;
  min-height: 100dvh;
}

.screen {
  display: none;
  padding-bottom: 32px;
}

.screen.active {
  display: block;
}

/* ===== Hero Home Screen ===== */
.hero {
  text-align: center;
  padding: 40px 24px 44px;
  margin: 0 -16px 28px;
  background: var(--gradient-hero);
  border-radius: 0 0 32px 32px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Ctext x='30' y='38' text-anchor='middle' font-size='16' fill='white' opacity='0.04'%3E%E2%98%85%3C/text%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-stars {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 4px;
}

.hero-flag {
  font-size: 3.5rem;
  margin-bottom: 12px;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.3));
}

.hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.15;
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.hero .subtitle {
  color: rgba(255, 255, 255, 0.7);
  font-size: clamp(0.95rem, 2.5vw, 1.1rem);
  margin-top: 10px;
  font-weight: 400;
}

.test-selector {
  margin-top: 0;
}

.test-selector h2 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-500);
  margin-bottom: 14px;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.test-option {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 20px;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 12px;
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.test-option:hover,
.test-option:focus-visible {
  border-color: var(--blue-600);
  box-shadow: var(--shadow-md), var(--shadow-blue);
  transform: translateY(-2px);
  outline: none;
}

.test-option:active {
  transform: translateY(0) scale(0.98);
}

.test-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--gradient-hero);
  color: var(--white);
  font-weight: 800;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  box-shadow: 0 4px 8px rgba(15, 27, 61, 0.3);
}

.test-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.test-info strong {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-900);
}

.test-info span {
  font-size: 0.85rem;
  color: var(--gray-500);
}

.test-detail {
  font-weight: 600;
  color: var(--blue-700) !important;
}

/* ===== Dashboard ===== */
.dash-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  position: sticky;
  top: 4px;
  background: rgba(240, 242, 245, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 10;
}

.dash-header h1 {
  font-size: 1.25rem;
  font-weight: 800;
}

.btn-back {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--blue-700);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-back:hover {
  background: var(--blue-50);
  transform: translateX(-2px);
}

.btn-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--gray-500);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--gray-200);
  transform: rotate(60deg);
}

/* Progress Ring */
.progress-summary {
  display: flex;
  align-items: center;
  gap: 24px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
}

.progress-ring-container {
  position: relative;
  width: 120px;
  height: 120px;
  flex-shrink: 0;
}

.progress-ring {
  transform: rotate(-90deg);
  width: 120px;
  height: 120px;
}

.progress-ring-bg {
  fill: none;
  stroke: var(--gray-200);
  stroke-width: 8;
}

.progress-ring-fill {
  fill: none;
  stroke: url(#ring-gradient);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.progress-pct {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--gray-900);
}

.progress-label {
  font-size: 0.7rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.progress-stats {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
}

.stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.stat-num {
  font-size: 1.5rem;
  font-weight: 800;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--gray-500);
  font-weight: 500;
}

.stat:nth-child(1) .stat-num { color: var(--green-600); }
.stat:nth-child(2) .stat-num { color: var(--yellow-500); }
.stat:nth-child(3) .stat-num { color: var(--gray-400); }

/* Study Modes */
.study-modes {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 18px 20px;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.mode-btn::after {
  content: "\203A";
  position: absolute;
  right: 20px;
  font-size: 1.5rem;
  color: var(--gray-300);
  font-weight: 300;
  transition: all var(--transition);
}

.mode-btn:hover,
.mode-btn:focus-visible {
  border-color: var(--blue-600);
  box-shadow: var(--shadow-md), var(--shadow-blue);
  transform: translateY(-2px);
  outline: none;
}

.mode-btn:hover::after {
  color: var(--blue-600);
  right: 16px;
}

.mode-btn:active {
  transform: translateY(0) scale(0.98);
}

.mode-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-50);
  border-radius: var(--radius-sm);
}

.mode-btn:nth-child(2) .mode-icon {
  background: var(--yellow-100);
}

.mode-btn:nth-child(3) .mode-icon {
  background: var(--red-100);
}

.mode-btn strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
}

.mode-btn span {
  font-size: 0.85rem;
  color: var(--gray-500);
}

/* Category Progress */
.category-progress {
  background: var(--white);
  padding: 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}

.category-progress h3 {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.category-item {
  margin-bottom: 16px;
}

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

.category-name {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 6px;
}

.category-name span:first-child {
  font-weight: 600;
  color: var(--gray-700);
}

.category-name span:last-child {
  color: var(--gray-400);
  font-weight: 600;
}

.category-bar {
  height: 8px;
  background: var(--gray-100);
  border-radius: 4px;
  overflow: hidden;
}

.category-bar-fill {
  height: 100%;
  background: var(--gradient-progress);
  border-radius: 4px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Study Screen ===== */
.study-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0 8px;
  position: sticky;
  top: 4px;
  background: rgba(240, 242, 245, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 10;
}

.study-counter {
  font-weight: 700;
  color: var(--gray-700);
  font-size: 0.95rem;
}

.study-mode-label {
  font-size: 0.8rem;
  color: var(--blue-700);
  font-weight: 700;
  background: var(--blue-100);
  padding: 5px 14px;
  border-radius: 20px;
}

.progress-bar-container {
  height: 6px;
  background: var(--gray-200);
  border-radius: 3px;
  margin-bottom: 20px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-progress);
  border-radius: 3px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
  position: relative;
}

/* Flashcard */
.flashcard-container {
  perspective: 1000px;
  margin-bottom: 16px;
}

.flashcard {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 0;
  min-height: 200px;
  position: relative;
  overflow: hidden;
  animation: cardSlideIn 0.3s ease;
}

.flashcard::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--gradient-patriotic);
}

.flashcard-inner {
  padding: 32px 24px 28px;
}

.card-category {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue-700);
  margin-bottom: 4px;
  padding-top: 8px;
}

.card-subcategory {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-bottom: 20px;
  font-weight: 500;
}

.card-question {
  font-size: clamp(1.15rem, 3.5vw, 1.4rem);
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.4;
}

/* Answer Section */
.card-answer {
  margin-top: 20px;
  animation: fadeInUp 0.3s ease;
}

.card-answer h3 {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--green-600);
  margin-bottom: 10px;
}

.card-answer ul {
  padding-left: 0;
}

.card-answer li {
  font-size: 1.05rem;
  color: var(--gray-900);
  padding: 6px 0;
  padding-left: 28px;
  position: relative;
  font-weight: 500;
}

.card-answer li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  width: 20px;
  height: 20px;
  background: var(--green-100);
  color: var(--green-600);
  font-weight: 700;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  top: 8px;
}

.answer-divider {
  height: 1px;
  background: linear-gradient(90deg, var(--gray-200), transparent);
  margin-bottom: 16px;
}

.spanish-divider {
  height: 1px;
  background: linear-gradient(90deg, #f0e6d2, transparent);
  margin-bottom: 16px;
}

/* Spanish Section */
.card-spanish {
  margin-top: 20px;
  overflow: hidden;
  animation: fadeInUp 0.3s ease;
}

.card-spanish-inner {
  background: var(--cream);
  border-radius: var(--radius-sm);
  padding: 16px;
  border-left: 3px solid var(--red-600);
}

.card-spanish h3 {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--red-600);
  margin-bottom: 8px;
}

.card-spanish p {
  font-size: 0.95rem;
  color: var(--gray-700);
  line-height: 1.65;
  font-style: italic;
}

.hidden {
  display: none !important;
}

/* Card Actions */
.card-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}

.btn-primary {
  width: 100%;
  padding: 16px 24px;
  background: var(--gradient-primary);
  color: var(--white);
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  min-height: 52px;
  box-shadow: var(--shadow-blue);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255,255,255,0.1), transparent);
  pointer-events: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

/* Show Answer pulse animation */
#btn-show-answer {
  animation: subtlePulse 2.5s ease-in-out infinite;
}

@keyframes subtlePulse {
  0%, 100% { box-shadow: var(--shadow-blue); }
  50% { box-shadow: 0 4px 24px rgba(37, 99, 235, 0.4); }
}

#btn-show-answer:hover {
  animation: none;
}

.btn-secondary {
  width: 100%;
  padding: 14px 24px;
  background: var(--white);
  color: var(--gray-700);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--gray-300);
  transition: all var(--transition);
  min-height: 48px;
}

.btn-secondary:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-spanish {
  width: 100%;
  padding: 14px 24px;
  background: var(--red-100);
  color: var(--red-700);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  transition: all var(--transition);
  min-height: 48px;
}

.btn-spanish:hover {
  background: #fecaca;
  transform: translateY(-1px);
  box-shadow: var(--shadow-red);
}

.btn-spanish.active {
  background: var(--red-700);
  color: var(--white);
  box-shadow: var(--shadow-red);
}

.assess-buttons {
  display: flex;
  gap: 10px;
}

.btn-need-practice {
  flex: 1;
  padding: 16px 12px;
  background: var(--yellow-100);
  color: #92400e;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  min-height: 52px;
  border: 1.5px solid transparent;
}

.btn-need-practice:hover {
  background: #fef08a;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(234, 179, 8, 0.25);
  border-color: var(--yellow-500);
}

.btn-got-it {
  flex: 1;
  padding: 16px 12px;
  background: var(--green-100);
  color: var(--green-700);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  min-height: 52px;
  border: 1.5px solid transparent;
}

.btn-got-it:hover {
  background: #bbf7d0;
  transform: translateY(-2px);
  box-shadow: var(--shadow-green);
  border-color: var(--green-500);
}

/* Card Navigation */
.card-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.btn-nav {
  padding: 12px 20px;
  color: var(--blue-700);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  min-height: 44px;
  min-width: 44px;
  transition: all var(--transition-fast);
}

.btn-nav:hover {
  background: var(--blue-50);
  transform: translateX(2px);
}

#btn-prev:hover {
  transform: translateX(-2px);
}

.btn-nav:disabled {
  color: var(--gray-300);
  cursor: default;
}

.btn-nav:disabled:hover {
  background: transparent;
  transform: none;
}

/* ===== Results Screen ===== */
.results-container {
  text-align: center;
  padding: 48px 0 32px;
}

.results-icon {
  font-size: 4rem;
  margin-bottom: 16px;
  animation: bounceIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.results-container h1 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 24px;
}

.results-score {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 12px;
}

.score-num {
  font-size: 4.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-total {
  font-size: 1.5rem;
  color: var(--gray-400);
  font-weight: 700;
}

.results-msg {
  font-size: 1.1rem;
  color: var(--gray-500);
  margin-bottom: 32px;
  font-weight: 500;
}

.results-msg.pass {
  color: var(--green-600);
  font-weight: 700;
}

.results-msg.fail {
  color: var(--red-600);
  font-weight: 600;
}

.results-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Confetti for pass results */
.results-container.pass-celebration {
  position: relative;
}

.results-container.pass-celebration::before,
.results-container.pass-celebration::after {
  content: "🎉 ⭐ 🇺🇸 ⭐ 🎉";
  position: absolute;
  font-size: 1.5rem;
  letter-spacing: 8px;
  animation: confettiFall 2s ease-out forwards;
  pointer-events: none;
}

.results-container.pass-celebration::before {
  top: 0;
  left: 10%;
}

.results-container.pass-celebration::after {
  top: 0;
  right: 10%;
  animation-delay: 0.3s;
}

/* ===== Settings Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.modal.hidden {
  display: none !important;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 600px;
  background: var(--white);
  border-radius: 20px 20px 0 0;
  padding: 32px 24px 36px;
  z-index: 1;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.3s ease;
}

.modal-content h2 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.setting-row label {
  font-size: 0.95rem;
  color: var(--gray-700);
  font-weight: 500;
}

/* Toggle Switch */
.toggle {
  appearance: none;
  width: 48px;
  height: 28px;
  background: var(--gray-300);
  border-radius: 14px;
  position: relative;
  cursor: pointer;
  transition: background var(--transition);
  flex-shrink: 0;
}

.toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  background: var(--white);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.toggle:checked {
  background: var(--blue-700);
}

.toggle:checked::after {
  transform: translateX(20px);
}

.modal-content hr {
  border: none;
  border-top: 1px solid var(--gray-200);
  margin: 16px 0;
}

.btn-danger {
  width: 100%;
  padding: 14px 24px;
  background: var(--red-100);
  color: var(--red-700);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  min-height: 48px;
  transition: all var(--transition);
}

.btn-danger:hover {
  background: #fecaca;
  transform: translateY(-1px);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes cardSlideIn {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bounceIn {
  0% { opacity: 0; transform: scale(0.3); }
  50% { transform: scale(1.05); }
  70% { transform: scale(0.95); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes confettiFall {
  0% { opacity: 1; transform: translateY(0) rotate(0deg); }
  100% { opacity: 0; transform: translateY(80px) rotate(15deg); }
}

.screen.active {
  animation: fadeIn 0.3s ease;
}

/* ===== Responsive ===== */
@media (min-width: 640px) {
  #app {
    padding: 4px 24px 0;
  }

  .hero {
    margin: 0 -24px 28px;
    border-radius: 0 0 40px 40px;
    padding: 48px 32px 52px;
  }

  .flashcard {
    /* More padding inside on desktop handled by card-category etc */
  }

  .card-category {
    padding-top: 12px;
  }

  .modal {
    align-items: center;
  }

  .modal-content {
    border-radius: var(--radius);
    max-width: 480px;
  }
}

/* ===== Focus Styles ===== */
:focus-visible {
  outline: 2px solid var(--blue-600);
  outline-offset: 2px;
}