:root {
  /* Premium Minimalist Palette */
  --bg: #f8fafb;
  --bg-ambient: #eff3f6;
  --surface: #ffffff;
  --ink: #090e14;
  --muted: #64748b;
  --border: rgba(148, 163, 184, 0.25);
  --border-focus: rgba(15, 23, 42, 0.8);
  
  --accent: #0f172a;
  --accent-hover: #1e293b;
  --accent-soft: #f1f5f9;
  
  --ok: #059669;
  --ok-bg: #ecfdf5;
  --ok-border: #a7f3d0;
  
  --bad: #e11d48;
  --bad-bg: #fff1f2;
  --bad-border: #fecdd3;
  
  --radius-xl: 1.5rem;
  --radius-lg: 1rem;
  --radius-md: 0.75rem;
  --radius-sm: 0.5rem;
  
  /* Spring animations */
  --spring: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: all 0.4s var(--spring);
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: 'Satoshi', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background-color: var(--bg);
  min-height: 100dvh;
  overflow-y: scroll;
}

.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: 
    radial-gradient(circle at 15% 50%, var(--bg-ambient) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, var(--bg-ambient) 0%, transparent 50%);
  pointer-events: none;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1rem; font-weight: 600; display: flex; align-items: center; gap: 0.5rem; }

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.display-title {
  font-size: 2rem;
  letter-spacing: -0.04em;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.title-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.text-icon {
  font-size: 2.2rem;
  color: var(--accent);
}

.dynamic-island {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  transition: var(--transition);
}

.dynamic-island.success {
  color: var(--ok);
  background: var(--ok-bg);
  border-color: var(--ok-border);
}

.dynamic-island.error {
  color: var(--bad);
  background: var(--bad-bg);
  border-color: var(--bad-border);
}

.content-viewport {
  position: relative;
}

.panel {
  animation: slideUpIn 0.5s var(--spring) forwards;
}

.panel.hidden {
  display: none;
}

@keyframes slideUpIn {
  from { opacity: 0; transform: translateY(10px) scale(0.99); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.panel-header {
  margin-bottom: 1.5rem;
}

.bento-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
  align-items: start; /* Prevents cards from stretching to match the taller sibling */
}

#dashboardPanel .weakness-grid {
  align-items: stretch; /* Cards in this row will have the same height */
}

#dashboardPanel .list-card {
  display: flex;
  flex-direction: column;
  height: 500px; /* Fixed height to prevent page jumping */
  overflow: hidden;
}

#dashboardPanel .list-card .data-list {
  flex: 1;
  overflow-y: auto;
  padding-right: 0.5rem;
  margin-right: -0.5rem;
  margin-top: 1rem;
}

#resultMistakes {
  margin-top: 1.5rem;
  gap: 1rem;
}

.ans-row div {
  word-break: break-word; /* Ensures long text wraps correctly */
}

/* Custom scrollbar for better look */
.data-list::-webkit-scrollbar {
  width: 4px;
}

.data-list::-webkit-scrollbar-track {
  background: transparent;
}

.data-list::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}

.data-list::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

.bento-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1.5rem;
}

.bento-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.bento-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: 0 20px 40px -15px rgba(0,0,0,0.03);
  transition: var(--transition);
}

.mt-bento { margin-top: 1.5rem; }
.mt-2 { margin-top: 0.5rem; }
.w-full { width: 100%; }
.max-w-3xl { max-width: 48rem; }
.text-left { text-align: left; }
.mx-auto { margin-left: auto; margin-right: auto; }
.text-lg { font-size: 1.125rem; }

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.file-input-wrapper {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

input[type="file"] {
  width: 100%;
  padding: 0.75rem;
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--ink);
  background: var(--accent-soft);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-group span {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
}

input[type="text"], select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.9375rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--ink);
  transition: var(--transition);
  outline: none;
}

input[type="text"]:focus, select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn.primary {
  background: var(--accent);
  color: var(--surface);
}

.btn.primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn.outline {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
}

.btn.outline:hover:not(:disabled) {
  background: var(--accent-soft);
}

.btn.ghost {
  background: transparent;
  color: var(--muted);
  padding: 0.5rem;
}

.btn.ghost:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

.btn.large {
  padding: 1rem 1.5rem;
  font-size: 1rem;
}

.btn.finish {
  background: var(--ok);
  color: #fff;
}

.btn.finish:hover:not(:disabled) {
  background: #047857;
}

.advanced-box {
  margin-top: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
}

.advanced-box summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  user-select: none;
}

.action-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.action-row select {
  flex: 1;
}

.action-card h3 { margin-bottom: 0.5rem; }

.result-grid-box {
  width: 100%;
  max-width: 800px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
}

.question-map {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 0.5rem;
  margin-top: 1rem;
}

.map-item {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--muted);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.map-item.correct {
  background: var(--ok-bg);
  color: var(--ok);
  border-color: var(--ok-border);
}

.map-item.wrong {
  background: var(--bad-bg);
  color: var(--bad);
  border-color: var(--bad-border);
}

.bento-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 30px 60px -12px rgba(0,0,0,0.06);
}

.actions-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  justify-content: flex-start; /* Keeps cards at the top */
}

.actions-col .bento-card {
  height: auto; /* Allow cards to take only necessary height */
}

.primary-action {
  background: linear-gradient(135deg, var(--surface) 0%, var(--accent-soft) 100%);
}

.stat-card .label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--muted);
}

.stat-card .value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: 'Satoshi', sans-serif;
  letter-spacing: -0.02em;
}

.data-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.data-list li {
  font-size: 0.875rem;
  color: var(--ink);
  line-height: 1.4;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid transparent;
  transition: var(--transition);
  position: relative;
}

.data-list li:hover {
  background: var(--accent-soft);
  border-color: var(--border);
}

.mistake-item {
  border: 1px solid var(--border);
  margin-bottom: 0.75rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.mistake-item:hover {
  border-color: var(--border-focus);
}

.mistake-header {
  padding: 1rem 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  font-weight: 600;
  gap: 1rem;
  background: var(--surface);
}

.mistake-header .info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mistake-header .badge {
  background: var(--bad-bg);
  color: var(--bad);
  padding: 0.2rem 0.6rem;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.mistake-content {
  padding: 0 1.25rem 1.25rem 1.25rem;
  display: none;
  border-top: 1px solid var(--border);
  background: var(--accent-soft);
}

.mistake-item.open .mistake-content {
  display: block;
}

.mistake-item.open .ph-caret-down {
  transform: rotate(180deg);
}

.mistake-q-text {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
  color: var(--ink);
  padding: 1rem 0;
  font-weight: 500;
}

.ans-box {
  display: grid;
  gap: 0.75rem;
}

.ans-row {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  line-height: 1.5;
  align-items: flex-start;
}

.ans-row.user {
  background: var(--bad-bg);
  border: 1px solid var(--bad-border);
  color: var(--bad);
}

.ans-row.correct {
  background: var(--ok-bg);
  border: 1px solid var(--ok-border);
  color: var(--ok);
}

.ans-row i {
  margin-top: 0.2rem;
  font-size: 1.1rem;
}

.weak-q-item {
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.weak-q-item .q-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.weak-q-item .q-text-preview {
  display: none;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
  line-height: 1.5;
  padding: 0.75rem;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.weak-q-item.open .q-text-preview {
  display: block;
}

.ph-caret-down {
  transition: transform 0.2s ease;
}

.table-wrap {
  overflow-x: auto;
  margin-top: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.test-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.progress-container {
  margin-top: 1rem;
}

.progress-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(15, 23, 42, 0.4); }
  70% { box-shadow: 0 0 0 6px rgba(15, 23, 42, 0); }
  100% { box-shadow: 0 0 0 0 rgba(15, 23, 42, 0); }
}

.progress-track {
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.6s var(--spring);
}

.question-canvas {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: 0 20px 40px -15px rgba(0,0,0,0.03);
}

.question-text {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.options-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.option {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9375rem;
  font-weight: 500;
}

.option:hover {
  border-color: var(--border-focus);
  background: var(--accent-soft);
  transform: translateX(4px);
}

.option input[type="radio"] {
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--accent);
  cursor: pointer;
}

.option.correct {
  border-color: var(--ok-border);
  background: var(--ok-bg);
  color: var(--ok);
}

.option.wrong {
  border-color: var(--bad-border);
  background: var(--bad-bg);
  color: var(--bad);
}

.test-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.feedback-toast {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feedback-toast.ok {
  background: var(--ok-bg);
  border: 1px solid var(--ok-border);
  color: var(--ok);
}

.feedback-toast.bad {
  background: var(--bad-bg);
  border: 1px solid var(--bad-border);
  color: var(--bad);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.result-canvas {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem 0;
}

.result-header {
  text-align: center;
  margin-bottom: 1rem;
}

.result-icon {
  font-size: 4rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.result-canvas h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.result-canvas .metrics-grid,
.result-grid-box,
.result-canvas .bento-grid-2 {
  width: 100%;
  max-width: 800px;
}

.result-actions {
  margin-top: 1rem;
}

.message {
  margin-top: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
}

@media (max-width: 768px) {
  .bento-layout {
    grid-template-columns: 1fr;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .app-shell {
    padding: 1rem;
  }
  
  .question-canvas {
    padding: 1.5rem;
  }
  
  .option:hover {
    transform: none;
  }
  
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}