/* Modern Typography & Variables */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Grotesk:wght@500;700&display=swap');

:root {
  /* Core Palette - Modern & Vibrant */
  --bg: #0f111a;
  --bg-gradient: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.15), transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.1), transparent 40%);
  --bg-surface: rgba(15, 17, 26, 0.92);

  --card-bg: rgba(30, 32, 47, 0.7);
  --card-border: rgba(255, 255, 255, 0.1);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

  --text-main: #ffffff;
  --text-muted: #d1d5db;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.5);

  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;

  --accent: #8b5cf6;

  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;

  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  --transition: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-gradient: radial-gradient(circle at 0% 0%, rgba(99, 102, 241, 0.08), transparent 50%),
    radial-gradient(circle at 100% 100%, rgba(16, 185, 129, 0.08), transparent 50%);
  --bg-surface: rgba(248, 250, 252, 0.92);
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(0, 0, 0, 0.06);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);

  --text-main: #111827;
  --text-muted: #4b5563;
  --primary-glow: rgba(99, 102, 241, 0.25);
}



[data-theme="midnight"] {
  --bg: #020617;
  --bg-gradient: linear-gradient(to bottom right, #0f172a, #020617);
  --bg-surface: rgba(2, 6, 23, 0.92);
  --card-bg: rgba(15, 23, 42, 0.8);
  --card-border: rgba(56, 189, 248, 0.15);
  --text-main: #ffffff;
  --text-muted: #cbd5e1;
  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --primary-glow: rgba(56, 189, 248, 0.4);
  --accent: #818cf8;
}

[data-theme="forest"] {
  --bg: #052e16;
  --bg-gradient: radial-gradient(circle at 50% 0%, rgba(34, 197, 94, 0.1), transparent 60%);
  --bg-surface: rgba(5, 46, 22, 0.9);
  --card-bg: rgba(20, 83, 45, 0.6);
  --card-border: rgba(74, 222, 128, 0.1);
  --text-main: #ffffff;
  --text-muted: #dcfce7;
  --primary: #4ade80;
  --primary-hover: #22c55e;
  --primary-glow: rgba(74, 222, 128, 0.4);
  --accent: #a3e635;
}

[data-theme="ocean"] {
  --bg: #0c4a6e;
  --bg-gradient: linear-gradient(180deg, #082f49 0%, #0c4a6e 100%);
  --bg-surface: rgba(12, 74, 110, 0.9);
  --card-bg: rgba(8, 51, 68, 0.7);
  --card-border: rgba(125, 211, 252, 0.1);
  --text-main: #ffffff;
  --text-muted: #e0f2fe;
  --primary: #38bdf8;
  --primary-hover: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.45);
  --accent: #7dd3fc;
}

[data-theme="sunset"] {
  --bg: #1c0c11;
  --bg-gradient: linear-gradient(135deg, #2a0a12 0%, #1c0c11 100%);
  --bg-surface: rgba(28, 12, 17, 0.92);
  --card-bg: rgba(45, 15, 25, 0.7);
  --card-border: rgba(251, 113, 133, 0.15);
  --text-main: #ffffff;
  --text-muted: #ffe4e6;
  --primary: #fb7185;
  --primary-hover: #f43f5e;
  --primary-glow: rgba(251, 113, 133, 0.4);
  --accent: #fcd34d;
}

[data-theme="lavender"] {
  --bg: #110e1b;
  --bg-gradient: radial-gradient(circle at 80% 10%, rgba(192, 132, 252, 0.1), transparent 40%);
  --bg-surface: rgba(17, 14, 27, 0.92);
  --card-bg: rgba(30, 25, 45, 0.7);
  --card-border: rgba(192, 132, 252, 0.12);
  --text-main: #ffffff;
  --text-muted: #f3e8ff;
  --primary: #c084fc;
  --primary-hover: #a855f7;
  --primary-glow: rgba(192, 132, 252, 0.35);
  --accent: #f9a8d4;
}

[data-theme="terminal"] {
  --bg: #000000;
  --bg-gradient: none;
  --bg-surface: #000000;
  --card-bg: #0a0a0a;
  --card-border: #333333;
  --card-shadow: none;
  --text-main: #4ade80;
  --text-muted: #22c55e;
  --primary: #22c55e;
  --primary-hover: #16a34a;
  --primary-glow: transparent;
  --success: #22c55e;
  --danger: #ef4444;
  --accent: #22c55e;
  --radius-lg: 0px;
  --radius-md: 0px;
  --radius-sm: 0px;
  --font-heading: 'SF Mono', 'Menlo', monospace;
  --font-body: 'SF Mono', 'Menlo', monospace;
}

[data-theme="terminal"] .bg-grid {
  display: none;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  font-family: var(--font-body);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

/* Background Grid Effect */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
  mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
}

[data-theme="light"] .bg-grid {
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.04) 1px, transparent 1px);
}



/* Typography & Base Components */
h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  margin: 0;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

h1 {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(to right, var(--text-main), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  background: linear-gradient(to right, var(--text-main), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* Performance Mode Overrides */
html.perf-mode {
  --transition: none !important;
}

html.perf-mode * {
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  box-shadow: none !important;
  animation: none !important;
  transition: none !important;
}

html.perf-mode .panel,
html.perf-mode .card,
html.perf-mode .pill,
html.perf-mode .btn-icon,
html.perf-mode .option-btn {
  background: var(--bg);
  border-color: var(--card-border);
}

html.perf-mode .bg-grid {
  display: none;
}

html.perf-mode .logo-area .symbol {
  background: var(--bg);
  box-shadow: none;
}

/* Flatten hover/scale effects in performance mode */
html.perf-mode .option-btn,
html.perf-mode .btn-icon,
html.perf-mode .btn-nav,
html.perf-mode .primary,
html.perf-mode .secondary,
html.perf-mode .ghost,
html.perf-mode .test-card {
  transform: none !important;
}

html.perf-mode .option-btn:hover,
html.perf-mode .btn-icon:hover,
html.perf-mode .btn-nav:hover,
html.perf-mode .primary:hover,
html.perf-mode .secondary:hover,
html.perf-mode .ghost:hover,
html.perf-mode .test-card:hover {
  transform: none !important;
}

h2 {
  font-size: 1.75rem;
  font-weight: 700;
}

p {
  margin: 0;
}

code {
  background: rgba(var(--primary), 0.1);
  color: var(--primary);
  padding: 0.25em 0.5em;
  border-radius: 6px;
  font-size: 0.9em;
  font-family: 'Consolas', monospace;
  border: 1px solid var(--card-border);
}

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

a:hover {
  color: var(--primary-hover);
}

.eyebrow {
  text-transform: uppercase;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  display: block;
}

.muted {
  color: var(--text-muted);
}

/* Layout Structure */
body {
  padding: clamp(16px, 4vw, 40px);
}

.topbar {
  width: 100%;
  margin: 0 0 32px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--card-border);
  position: relative;
  z-index: 10;
}

@media (min-width: 768px) {
  .topbar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* ... */

.layout {
  position: relative;
  z-index: 10;
  width: 100%;
  margin: 0;
  display: grid;
  gap: 24px;
  /* Sidebar: Min 280px, Max 400px, otherwise proportional */
  grid-template-columns: minmax(280px, 25%) 1fr;
}

@media (max-width: 768px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {

  .panel,
  .card {
    padding: 20px;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .active-test {
    font-size: 1rem;
  }

  .question-text {
    font-size: 1.15rem;
  }

  .topbar {
    gap: 10px;
  }

  .topbar-actions {
    flex-wrap: wrap;
    height: auto;
    justify-content: flex-start;
  }

  .test-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .test-actions button,
  .test-actions select,
  .test-actions input {
    width: 100%;
  }

  .time-input-row .time-select {
    width: 100%;
  }
}

/* Glass Panels */
.panel,
.card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.panel::before,
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.05), transparent);
  pointer-events: none;
  z-index: 0;
}

.panel>*,
.card>* {
  position: relative;
  z-index: 1;
}

/* Sidebar & Test Selection */
.test-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-height: calc(100vh - 100px);
  /* adjusted for topbar */
  position: sticky;
  top: 20px;
}

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

.test-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 4px;
}

.test-list::-webkit-scrollbar {
  width: 6px;
}

.test-list::-webkit-scrollbar-thumb {
  background: var(--card-border);
  border-radius: 99px;
}

.test-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
  padding: 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 12px;
}

.test-card:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.test-meta h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.test-meta p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.test-actions {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  align-items: center;
  margin-top: 8px;
}

select {
  background: var(--bg);
  color: var(--text-main);
  border: 1px solid var(--card-border);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  outline: none;
}

select:focus {
  border-color: var(--primary);
}

.time-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}

/* Standalone time-select styling (when not in .time-input-row) */
.time-select {
  width: 90px;
  padding: 8px 12px;
  border: 2px solid var(--card-border);
  border-radius: var(--radius-sm);
  background: var(--card-bg) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-main) !important;
  font-weight: 500;
  font-family: var(--font-body);
  text-align: center;
  transition: var(--transition);
  outline: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .time-select {
  background: rgba(255, 255, 255, 0.9) !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), inset 0 1px 2px rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.15);
}

.time-select:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-glow), 0.1);
}

.time-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.time-input-row .time-select {
  width: 90px;
  padding: 8px 12px;
  border: 2px solid var(--card-border);
  border-radius: var(--radius-sm);
  background: var(--card-bg) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-main) !important;
  font-weight: 500;
  font-family: var(--font-body);
  text-align: center;
  transition: var(--transition);
  outline: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .time-input-row .time-select {
  background: rgba(255, 255, 255, 0.9) !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), inset 0 1px 2px rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.15);
}

.time-input-row .time-select:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-glow), 0.1);
}

.time-input-row .time-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Remove spinners from number inputs */
.time-select::-webkit-inner-spin-button,
.time-select::-webkit-outer-spin-button,
.time-input-row .time-select::-webkit-inner-spin-button,
.time-input-row .time-select::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.time-select,
.time-input-row .time-select {
  -moz-appearance: textfield;
}

.time-select::placeholder,
.time-input-row .time-select::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.instructions-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--primary);
}

.instructions-header i {
  font-size: 1.2em;
}

/* Main Question Area */
.play-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--card-border);
}

.active-test-wrapper {
  display: flex;
  flex-direction: column;
}

.active-test {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  font-family: var(--font-heading);
}

.stats-group {
  display: flex;
  gap: 24px;
  align-items: center;
}

.timer-block #timer-display,
.score-block #score-display {
  font-family: 'Space Grotesk', monospace;
  font-size: 1.25rem;
  font-weight: 700;
}

.text-btn {
  font-size: 0.75rem;
  padding: 4px 8px;
  height: auto;
  border: 1px solid var(--card-border);
  border-radius: 4px;
}

/* Progress Bar */
.progress-shell {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  width: 0%;
  transition: width 0.4s ease;
  box-shadow: 0 0 12px var(--primary-glow);
}

/* Question Grid Drawer */
.question-grid-wrapper {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-md);
  padding: 12px;
}

.question-grid-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.question-grid-shell {
  max-height: 200px;
  overflow-y: auto;
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 8px;
}

.qdot {
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.qdot:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
}

.qdot.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

.qdot.correct {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
  border-color: var(--success);
}

.qdot.incorrect {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
  border-color: var(--danger);
}

.qdot.answered {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-main);
}

/* Question Card */
.question-text {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 8px 0 24px;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-btn {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.28);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  color: var(--text-main);
  text-align: left;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.option-btn:hover:not(:disabled) {
  background: rgba(99, 102, 241, 0.05);
  border-color: var(--primary);
  transform: translateX(4px);
}

[data-theme="light"] .option-btn {
  border-color: rgba(0, 0, 0, 0.2);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.12);
}

.option-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-color: var(--primary);
}

.option-btn.striked {
  opacity: 0.55;
  text-decoration: line-through;
  border-style: dashed;
}

.strike-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0.3;
  transition: all 0.2s;
  z-index: 5;
}

.strike-toggle:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
}

/* Ensure click on toggle doesn't look like button active state */
.strike-toggle:active {
  transform: translateY(-50%) scale(0.95);
}

.option-btn.selected {
  border-color: var(--primary);
  background: var(--primary-glow);
  /* Use existing RGBA variable */
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.option-btn.correct-highlight {
  box-shadow: 0 0 10px var(--success);
}

.option-btn.correct {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.option-btn.incorrect {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--danger);
  color: var(--danger);
}

.option-btn:disabled {
  opacity: 0.7;
  cursor: default;
  transform: none;
}

/* Buttons & Actions */
.actions {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

button,
.btn-icon,
.option-btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.logo-area .logo-img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: drop-shadow(0 0 8px var(--primary-glow));
}

/* Button variants */
.primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  padding: 12px 24px;
  box-shadow: 0 4px 15px var(--primary-glow);
  border: none;
}

.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--primary-glow);
  filter: brightness(1.1);
}

.primary:active {
  transform: translateY(0);
}

.secondary {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--card-border);
  color: var(--text-main);
  padding: 12px 24px;
}

.secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 8px 16px;
}

.ghost:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 12px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
}

.btn-icon:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-icon i {
  font-size: 1.4em;
}

/* Navigation Buttons (Polished) */
.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.08);
  /* More visible than ghost */
  color: var(--text-main);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  /* Pill shape */
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}

.btn-nav:hover {
  background: var(--card-bg);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-nav i {
  font-size: 1.2em;
}

/* Feedback & Explanation */
.feedback {
  font-weight: 700;
  margin-top: 16px;
  font-size: 1.1rem;
}

.feedback.correct {
  color: var(--success);
}

.feedback.incorrect {
  color: var(--danger);
}

.explanation {
  margin-top: 20px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Empty State */
.placeholder {
  padding: 80px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.empty-state-icon {
  font-size: 64px;
  color: var(--primary);
  margin-bottom: 16px;
  opacity: 0.5;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-10px);
  }

  100% {
    transform: translateY(0px);
  }
}

.placeholder h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
  color: var(--text-main);
}

.instructions {
  background: rgba(99, 102, 241, 0.1);
  border: 1px dashed var(--primary);
  padding: 16px;
  border-radius: var(--radius-md);
  margin-top: 16px;
}

.upload-box {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 10px 0;
}

.upload-box input[type="file"] {
  border: 1px dashed var(--card-border);
  padding: 12px;
  border-radius: var(--radius-md);
  background: rgba(var(--primary), 0.05);
  color: var(--text-muted);
  width: 100%;
  cursor: pointer;
  transition: var(--transition);
}

.upload-box input[type="file"]:hover {
  border-color: var(--primary);
  background: rgba(var(--primary), 0.1);
}

.upload-box input[type="file"]::file-selector-button {
  background: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--card-border);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  margin-right: 12px;
  font-family: var(--font-body);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.upload-box input[type="file"]::file-selector-button:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.upload-box .muted.small {
  font-size: 0.8rem;
}

.upload-box .error {
  color: var(--danger);
}

/* Summary Area */
.summary-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 16px;
}

.summary-score-large {
  font-size: 3rem;
  font-weight: 700;
  font-family: var(--font-heading);
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.summary-item {
  padding: 12px;
  margin-top: 8px;
  background: rgba(0, 0, 0, 0.1);
  border-radius: var(--radius-sm);
}

/* Settings Grid Overhaul */
.settings-grid-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

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

.setting-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.setting-header .symbol-small {
  font-size: 24px;
  color: var(--primary);
  padding: 8px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 8px;
}

.setting-title {
  flex: 1;
}

.setting-title h4 {
  font-size: 1rem;
  margin-bottom: 2px;
}

/* Settings Overlay */
.settings-overlay {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 32px 16px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.18), rgba(16, 185, 129, 0.08)), var(--bg-surface);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  overflow-y: auto;
}

.settings-overlay.hidden {
  display: none;
}

.settings-modal {
  width: min(980px, 100%);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-topbar {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin: 0 0 8px 0;
  box-shadow: var(--card-shadow);
}

.settings-layout-modal {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-layout-modal .panel {
  padding: 20px;
}

@media (min-width: 768px) {
  .settings-layout-modal {
    gap: 20px;
  }
}

.session-footer {
  margin-top: 20px;
  padding: 16px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hidden {
  display: none !important;
}

/* Settings Page */
.settings-body {
  max-width: 800px;
  margin: 0 auto;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.theme-card {
  background: var(--bg);
  border: 2px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 12px;
  cursor: pointer;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.theme-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.theme-card.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
  background: rgba(var(--primary), 0.05);
}

.swatch {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: block;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.swatch-accent {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg);
  /* Fallback */
}

.swatch-bg {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 60%;
  height: 60%;
  background: var(--primary);
  border-top-left-radius: 100%;
}

/* Theme Previews */

[data-theme-preview="light"] .swatch-accent {
  background: #f8fafc;
}

[data-theme-preview="light"] .swatch-bg {
  background: #6366f1;
}

[data-theme-preview="dark"] .swatch-accent {
  background: #0f111a;
}

[data-theme-preview="dark"] .swatch-bg {
  background: #6366f1;
}

[data-theme-preview="midnight"] .swatch-accent {
  background: #020617;
}

[data-theme-preview="midnight"] .swatch-bg {
  background: #38bdf8;
}

[data-theme-preview="forest"] .swatch-accent {
  background: #052e16;
}

[data-theme-preview="forest"] .swatch-bg {
  background: #4ade80;
}

[data-theme-preview="ocean"] .swatch-accent {
  background: #0c4a6e;
}

[data-theme-preview="ocean"] .swatch-bg {
  background: #38bdf8;
}

[data-theme-preview="sunset"] .swatch-accent {
  background: #1c0c11;
}

[data-theme-preview="sunset"] .swatch-bg {
  background: #fb7185;
}

[data-theme-preview="lavender"] .swatch-accent {
  background: #110e1b;
}

[data-theme-preview="lavender"] .swatch-bg {
  background: #c084fc;
}

[data-theme-preview="terminal"] .swatch-accent {
  background: #000000;
  border: 1px solid #333;
}

[data-theme-preview="terminal"] .swatch-bg {
  background: #22c55e;
}


.settings-carousel {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 12px;
}

.setting-card {
  min-width: 250px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.toggle input {
  display: none;
}

.slider {
  width: 52px;
  height: 28px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  position: relative;
  transition: background 0.2s ease;
}

.slider::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease;
}

.toggle input:checked+.slider {
  background: var(--primary);
}

.toggle input:checked+.slider::after {
  transform: translateX(24px);
}

.toggle-label {
  margin-left: 8px;
  font-weight: 500;
}

/* --- NEW FEATURES --- */

/* Keyboard Hints */
.kbd-hint {
  display: inline-block;
  min-width: 20px;
  padding: 2px 6px;
  font-size: 0.75rem;
  font-family: 'Consolas', monospace;
  font-weight: 700;
  color: var(--text-muted);
  border: 1px solid var(--card-border);
  border-radius: 4px;
  margin-right: 12px;
  background: rgba(0, 0, 0, 0.2);
  text-transform: uppercase;
  transition: var(--transition);
}

.option-btn:hover .kbd-hint {
  border-color: var(--primary);
  color: var(--primary);
}

/* Visual Analytics Chart */
.chart-container {
  margin: 32px 0;
  height: 300px;
  width: 100%;
  background: rgba(0, 0, 0, 0.15);
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid var(--card-border);
}

/* Summary Badges */
.summary-badge {
  padding: 4px 12px;
  border-radius: 99px;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.badge-neutral {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
}

.badge-bronze {
  background: rgba(180, 83, 9, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(180, 83, 9, 0.4);
}

.badge-silver {
  background: rgba(255, 255, 255, 0.1);
  color: #e5e7eb;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.badge-gold {
  background: linear-gradient(135deg, rgba(234, 179, 8, 0.2), rgba(250, 204, 21, 0.1));
  color: #facc15;
  border: 1px solid rgba(234, 179, 8, 0.5);
  box-shadow: 0 0 15px rgba(234, 179, 8, 0.2);
}

/* Animation Utilities */
@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-4px);
  }

  75% {
    transform: translateX(4px);
  }

  50% {
    transform: translateX(0);
  }
}

.incorrect {
  animation: shake 0.4s cubic-bezier(.36, .07, .19, .97) both;
}

/* --- SUMMARY AREA --- */
.summary-container {
  text-align: center;
  padding: 40px 20px;
  animation: fadeIn 0.5s ease-out;
  max-width: 600px;
  margin: 0 auto;
}

.summary-score-block {
  margin-bottom: 2rem;
  position: relative;
  display: inline-block;
}

.summary-score-main {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: -2px;
}

.summary-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.badge-gold {
  background: linear-gradient(135deg, #fbbf24, #d97706);
  color: #fff;
}

.badge-silver {
  background: linear-gradient(135deg, #e5e7eb, #9ca3af);
  color: #1f2937;
}

.badge-bronze {
  background: linear-gradient(135deg, #fdba74, #ea580c);
  color: #fff;
}

.badge-neutral {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
}

.summary-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 2rem 0;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 16px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-card i {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 8px;
}

#summary-chart-container {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-top: 2rem;
  height: 300px;
}

/* Unlock Overlay */
.unlock-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: opacity 0.5s ease;
}

.unlock-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.unlock-content {
  text-align: center;
  animation: fadeIn 0.8s ease-out;
}

.unlock-content .symbol {
  font-size: 64px;
  color: var(--primary);
  margin-bottom: 24px;
  animation: pulse 2s infinite;
}

.unlock-content h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.unlock-content p {
  font-size: 16px;
  color: var(--text-muted);
}

.unlock-action {
  margin-top: 20px;
  gap: 10px;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25), 0 0 0 1px var(--card-border);
}

.unlock-action i {
  font-size: 1.1em;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(1.1);
    opacity: 0.8;
  }

  100% {
    transform: scale(1);
    opacity: 1;
  }
}