/* CSS Design System */
:root {
  --bg-dark: #0b0b12;
  --bg-card: #12121c;
  --border-color: #232336;
  --primary: #c084fc;
  --primary-light: #d8b4fe;
  --secondary: #60a5fa;
  --secondary-light: #93c5fd;
  --text-primary: #f8fafc;
  --text-muted: #94a3b8;
  --font-brand: 'Outfit', -apple-system, sans-serif;
  --font-sans: 'Inter', -apple-system, sans-serif;
}

body {
  margin: 0;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.test-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.test-brand {
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.test-title-box {
  font-size: 0.85rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
}

.section-stepper {
  display: flex;
  gap: 8px;
}

.step-badge {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
}

.step-badge.active {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-color: var(--primary);
  box-shadow: 0 0 12px rgba(192,132,252,0.3);
}

.step-badge.completed {
  color: var(--primary-light);
  border-color: rgba(192,132,252,0.3);
  background: rgba(192,132,252,0.05);
}

.timer-box {
  font-weight: 700;
  color: #fff;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.2);
  padding: 8px 16px;
  border-radius: 12px;
  font-size: 1.1rem;
}

.btn-finish-sec {
  background: linear-gradient(135deg, #ef4444, #f87171);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
}

.screen-card {
  max-width: 600px;
  margin: 80px auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 40px;
  text-align: center;
  box-shadow: 0 20px 40px -15px rgba(0,0,0,0.5);
}

.intro-box h2 {
  font-family: var(--font-brand);
  font-size: 2rem;
  margin-bottom: 16px;
}

.intro-meta {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.meta-tag {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.intro-inst {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 32px;
  text-align: left;
  background: rgba(0,0,0,0.2);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.btn-begin {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  padding: 14px 36px;
  border-radius: 14px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 10px 20px -5px rgba(192,132,252,0.4);
}

.essay-container {
  display: flex;
  flex-direction: column;
  max-width: 800px;
  margin: 40px auto;
  gap: 24px;
}

.essay-prompts-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
}

.prompt-lbl {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.prompt-opt {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: 10px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.prompt-opt:hover {
  background: rgba(255,255,255,0.04);
}

.prompt-opt input[type="radio"] {
  margin-top: 4px;
}

.essay-editor {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
}

.editor-hdr {
  display: flex;
  justify-content: space-between;
  padding: 12px 24px;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border-color);
}

.essay-textarea {
  width: 100%;
  height: 350px;
  background: transparent;
  border: none;
  color: #fff;
  padding: 24px;
  box-sizing: border-box;
  font-family: inherit;
  font-size: 1.05rem;
  line-height: 1.6;
  resize: vertical;
}

.essay-textarea:focus {
  outline: none;
}

.test-main {
  display: grid;
  grid-template-columns: 1.2fr 300px;
  gap: 0;
  height: calc(100vh - 73px);
}

.test-main.split-mode {
  grid-template-columns: 1fr 1.2fr 300px;
}

.reading-pane {
  background: rgba(255,255,255,0.01);
  border-right: 1px solid var(--border-color);
  padding: 32px;
  overflow-y: auto;
}

.reading-title {
  font-family: var(--font-brand);
  font-size: 1.5rem;
  color: var(--secondary-light);
  margin-bottom: 16px;
}

.reading-content {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
  white-space: pre-line;
}

.q-area {
  padding: 32px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.q-sec-lbl {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.q-num-lbl {
  font-family: var(--font-brand);
  font-size: 1.6rem;
  margin-bottom: 24px;
}

.q-text {
  font-size: 1.15rem;
  line-height: 1.6;
  margin-bottom: 32px;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 40px;
}

.opt-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.opt-card:hover {
  background: rgba(255,255,255,0.04);
  border-color: var(--text-muted);
}

.opt-card.selected {
  background: rgba(192,132,252,0.1);
  border-color: var(--primary);
}

.opt-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  font-weight: 700;
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
}

.opt-card.selected .opt-letter {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.opt-text {
  font-size: 1rem;
}

.q-nav-ftr {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

.btn-nav {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-color);
  color: #fff;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
}

.btn-nav:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn-nav.pri {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-color: var(--primary);
}

.palette-panel {
  background: var(--bg-card);
  border-left: 1px solid var(--border-color);
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.palette-title {
  font-family: var(--font-brand);
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.palette-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-ans { background: var(--primary); }
.dot-unans { background: rgba(255,255,255,0.05); border: 1px solid var(--border-color); }
.dot-curr { border: 2px solid var(--secondary); background: transparent; }

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.pal-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-color);
  transition: all 0.15s ease;
}

.pal-badge:hover {
  background: rgba(255,255,255,0.05);
}

.pal-badge.ans {
  background: rgba(192,132,252,0.15);
  border-color: var(--primary);
  color: var(--primary-light);
}

.pal-badge.curr {
  background: rgba(96,165,250,0.15);
  border-color: var(--secondary);
  color: var(--secondary-light);
  box-shadow: 0 0 8px rgba(96,165,250,0.2);
}

.results-card {
  max-width: 900px;
  margin: 40px auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 40px;
  box-shadow: 0 20px 40px -15px rgba(0,0,0,0.5);
}

.res-header {
  text-align: center;
  margin-bottom: 40px;
}

.res-header h2 {
  font-family: var(--font-brand);
  font-size: 2.2rem;
  margin-bottom: 8px;
}

.score-hero {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(135deg, rgba(192,132,252,0.1), rgba(96,165,250,0.1));
  border: 1px solid rgba(192,132,252,0.2);
  padding: 24px 48px;
  border-radius: 20px;
  margin-bottom: 24px;
}

.res-score-big {
  font-size: 3.5rem;
  font-weight: 800;
  font-family: var(--font-brand);
  color: var(--primary-light);
  line-height: 1;
}

.score-lbl {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 8px;
}

.scores-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.score-box {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
}

.score-box-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.score-box-val {
  font-size: 1.8rem;
  font-weight: 700;
  font-family: var(--font-brand);
  color: #fff;
  margin-bottom: 4px;
}

.score-box-raw {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.review-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.rev-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.rev-tab-btn.active {
  color: var(--primary-light);
  border-bottom-color: var(--primary);
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.rev-item {
  background: rgba(255,255,255,0.01);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  border-left: 5px solid;
}

.rev-item.correct { border-left-color: #10b981; }
.rev-item.wrong { border-left-color: #ef4444; }

.rev-q {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 12px;
}

.rev-exp {
  background: rgba(0,0,0,0.2);
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 12px;
  line-height: 1.5;
}

.reg-modal-bg, .modal-bg {
  transition: opacity 0.3s ease;
}

.form-ctrl {
  outline: none;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-ctrl:focus {
  border-color: var(--primary) !important;
}

.btn-modal-pri {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.btn-modal-sec {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.diagram-box {
  margin: 16px 0;
  text-align: center;
  background: rgba(255,255,255,0.01);
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}
.diagram-img {
  max-width: 100%;
  max-height: 250px;
  height: auto;
  border-radius: 6px;
}

/* ── Responsive Styling Added for Mobile/Tablet Support ── */
@media (max-width: 1024px) {
  .test-main {
    grid-template-columns: 1fr !important;
    height: auto !important;
    min-height: calc(100vh - 73px);
  }
  .test-main.split-mode {
    grid-template-columns: 1fr !important;
  }
  .reading-pane, .q-area, .palette-panel {
    max-height: none !important;
    height: auto !important;
  }
  .palette-panel {
    border-left: none !important;
    border-top: 1px solid var(--border-color) !important;
    padding-top: 30px !important;
  }
}

@media (max-width: 840px) {
  .test-hdr {
    padding: 12px 16px !important;
    height: auto !important;
    flex-wrap: wrap !important;
    gap: 12px !important;
  }
  .test-brand .test-title-box {
    display: none !important;
  }
  .section-stepper {
    order: 3 !important;
    width: 100% !important;
    justify-content: center !important;
    overflow-x: auto !important;
    white-space: nowrap !important;
    padding-bottom: 4px !important;
    -webkit-overflow-scrolling: touch !important;
  }
  .section-stepper::-webkit-scrollbar {
    display: none !important;
  }
  .step-badge {
    flex-shrink: 0 !important;
  }
}

@media (max-width: 640px) {
  .screen-card {
    margin: 30px 16px !important;
    padding: 24px 16px !important;
    border-radius: 16px !important;
    width: auto !important;
    max-width: none !important;
  }
  .intro-box h2 {
    font-size: 1.5rem !important;
  }
  .intro-meta {
    flex-direction: column !important;
    align-items: center !important;
    gap: 8px !important;
  }
  .scores-grid, .res-cards {
    grid-template-columns: 1fr !important;
    gap: 16px !important;
  }
  .results-card {
    margin: 20px 12px !important;
    padding: 24px 16px !important;
  }
  .res-header h2 {
    font-size: 1.6rem !important;
  }
  .score-hero {
    padding: 16px 24px !important;
  }
  .res-score-big {
    font-size: 2.6rem !important;
  }
}

@media (max-width: 480px) {
  .q-nav-ftr {
    flex-direction: column !important;
    gap: 12px !important;
    align-items: stretch !important;
  }
  .btn-nav {
    width: 100% !important;
    text-align: center !important;
    padding: 12px !important;
  }
  .modal-actions {
    flex-direction: column !important;
    gap: 8px !important;
  }
  .btn-modal-pri, .btn-modal-sec {
    width: 100% !important;
  }
}