:root {
  --color-background: #eef3fb;
  --color-surface: #ffffff;
  --color-surface-alt: #f6f8fd;
  --color-elevated: #e6effd;
  --color-text: #12213a;
  --color-muted: #4b5c76;
  --color-muted-soft: #687b97;
  --color-border: #c7d4e8;
  --color-border-strong: #9db4d8;
  --color-border-subtle: #dde6f5;
  --color-accent-deep: #0b1f3f;
  --color-accent-primary: #164a96;
  --color-accent-secondary: #1f6ad8;
  --color-accent-tertiary: #6ca8ff;
  --color-accent-soft: #d7e4fa;
  --color-accent-highlight: #0f8dd6;
  --color-shadow-strong: rgba(12, 31, 63, 0.35);
  --color-shadow-soft: rgba(30, 74, 128, 0.18);
  --color-glow: rgba(31, 106, 216, 0.35);
  --color-focus-ring: rgba(31, 106, 216, 0.25);
  --color-button-hover: #103b79;
  --color-button-disabled: #6f87aa;
  --accent-green: #10b981;
  --accent-red: #ef4444;
}

*{
  box-sizing: border-box;
}    
:fullscreen #top, :fullscreen footer{
  display:none;
}

body {
  font-family: Arial, sans-serif;
  font-size: 19px;
  margin: 0;
  padding: 0;
  text-align: center;
  background: radial-gradient(circle at top, rgba(108, 168, 255, 0.15), transparent 45%) var(--color-background);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* Matter of Math page layout overrides */
body.matter-page {
  text-align: left;
  height: auto;
  min-height: 100vh;
  overflow: auto;
}

body.matter-page main.layout {
  max-width: 1200px;
  margin: 1.5rem auto;
}

body.matter-page .left-panel {
  flex: 2;
}

body.matter-page .right-panel {
  flex: 1;
}

header {
  background: linear-gradient(130deg, var(--color-accent-deep) 0%, var(--color-accent-primary) 45%, var(--color-accent-secondary) 100%);
  color: #f8fbff;
  padding: 1.25rem 0;
  text-align: center;
  box-shadow: 0 18px 36px var(--color-shadow-strong);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

header h1 {
  margin: 0;
  color: #f8fbff;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-shadow: 0 6px 18px rgba(11, 31, 63, 0.35);
}

main {
  flex-grow : 1;
  width : 100vw;
  display : flex;
  flex-direction : column;            
  overflow : auto;
}

.site-footer {
  background: linear-gradient(140deg, var(--color-accent-deep) 0%, #123866 55%, #1d4f8f 100%);
  color: #f5faff;
  padding: 1.25rem 2rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
  box-shadow: 0 -18px 40px rgba(12, 31, 63, 0.4);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 50%, rgba(255, 255, 255, 0.18), transparent 55%);
  pointer-events: none;
}

.site-footer small {
  margin: 0;
  font-size: 0.88rem;
  letter-spacing: 0.01em;
  opacity: 0.9;
  position: relative;
  z-index: 1;
  text-align: left;
  color: rgba(236, 244, 255, 0.92);
}

.sponsor-badge {
  position: relative;
  z-index: 1;
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.14), rgba(214, 232, 255, 0.28));
  border: 1px solid rgba(214, 232, 255, 0.45);
  box-shadow: 0 12px 34px rgba(12, 31, 63, 0.32);
  backdrop-filter: blur(10px);
}

.sponsor-text {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #f8fbff;
  white-space: nowrap;
}

.sponsor-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
}

.sponsor-logo img {
  display: block;
  width: 120px;
  height: auto;
  filter: drop-shadow(0 8px 18px rgba(15, 57, 117, 0.35));
}

@media (max-width: 720px) {
  .site-footer {
    justify-content: center;
    text-align: center;
    padding: 1.5rem 1.25rem;
  }

  .site-footer small {
    text-align: center;
    width: 100%;
  }

  .sponsor-badge {
    margin-left: 0;
    flex-direction: column;
    gap: 0.6rem;
    border-radius: 18px;
    padding: 0.9rem 1.15rem;
  }

  .sponsor-text {
    white-space: normal;
    font-size: 0.78rem;
  }

  .sponsor-logo {
    min-width: auto;
  }

  .sponsor-logo img {
    width: 110px;
  }
}

header .controls {
  display: inline-flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.ghost,
.primary {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
  cursor: pointer;
  border: none;
}

.ghost {
  background: rgba(255, 255, 255, 0.92);
  color: var(--color-accent-primary);
  border: 1px solid rgba(22, 74, 150, 0.2);
  box-shadow: 0 8px 22px rgba(13, 45, 94, 0.15);
}

.primary {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: #f8fbff;
  box-shadow: 0 14px 28px rgba(22, 74, 150, 0.28);
}

.primary:hover,
.ghost:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 36px rgba(15, 57, 117, 0.32);
}

.primary:active,
.ghost:active {
  transform: translateY(0);
  box-shadow: none;
  background: var(--color-button-hover);
  color: #f0f6ff;
}

/* Remove bullet points from all lists */
ul {
  list-style-type: none;
}

/* Remove bullet points from tree lists but keep indentation */
.tree {
  margin: 0;
  padding-left: 1.5rem;
}

/* Make summary elements clearly clickable */
summary {
  cursor: pointer;
}

/* Style for "Coming soon..." placeholder */
.coming-soon {
  color: var(--color-muted);
  font-style: italic;
  padding: 1rem;
  text-align: center;
  background-color: var(--color-accent-soft);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  margin: 0.5rem 0;
}

ol.question-list li{
  margin-bottom: 1rem;
  font-size: 1.2em;
}

section p, section ol, section ul {
  text-align: left;
}

p{
  text-indent: 30px;
  line-height: 1.2em;
}

.confetti {
  position: fixed;
  top: 0;
  animation: fall 3s linear infinite;
  opacity: 0;
}
@keyframes fall {
  0% {
    transform: translateY(-100px) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(500px) rotate(360deg);
    opacity: 0;
  }
}
.confetti-polygon {
  left: 10%;
  animation-delay: 0s;
}

.confetti-circle {
  left: 50%;
  animation-delay: 1s;
}

/* Donate page layout */
body.donate-page {
  background: linear-gradient(180deg, #f3f8ff 0%, #e0ecff 100%);
  overflow: auto;
}

.donate-main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem 1rem 3rem;
}

.donate-card {
  max-width: 520px;
  width: 100%;
  background: var(--color-surface);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 24px 50px rgba(15, 57, 117, 0.16);
  text-align: left;
  border: 1px solid var(--color-border-subtle);
}

.donate-card h2 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.75rem;
  color: var(--color-accent-deep);
}

.donate-intro {
  margin-bottom: 1.5rem;
  color: var(--color-muted);
  line-height: 1.5;
}

.donate-form {
  display: grid;
  gap: 1rem;
}

.donate-form label {
  display: flex;
  flex-direction: column;
  font-weight: 600;
  color: var(--color-text);
  gap: 0.35rem;
}

.donate-form input,
.donate-form textarea {
  font: inherit;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-alt);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.donate-form input:focus,
.donate-form textarea:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.amount-input {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.amount-input span {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent-primary);
}

.donation-status {
  margin-top: 1.25rem;
  min-height: 1.25rem;
  font-weight: 600;
}

.donation-status.info {
  color: var(--color-accent-primary);
}

.donation-status.error {
  color: var(--color-accent-deep);
}

.donation-status.warning {
  color: var(--color-muted-soft);
}

.donation-status.success {
  color: var(--color-accent-secondary);
}

.paypal-buttons-placeholder {
  margin-top: 1.75rem;
  display: flex;
  justify-content: center;
}

.paypal-buttons-placeholder .loading {
  color: var(--color-muted);
}

@media (max-width: 600px) {
  .donate-card {
    padding: 1.5rem;
  }
}

question-set ul{
  position : relative;
  list-style: none;
}

content-question.hidden {
  display: none;
}   
content-question {
  display: block;
  margin: 0 auto;
  max-width: 600px;
  padding: 1rem;
  background-color: var(--color-surface);
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(15, 57, 117, 0.08);
}
content-question.current {
  animation: fadeIn 0.5s ease-in-out;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}   

.question-container {
  position: relative;
}

.question-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0px;
  background: linear-gradient(135deg, rgba(22, 74, 150, 0.08), rgba(22, 74, 150, 0));
  border-radius: 12px;
  border: 1px solid var(--color-border-subtle);
}
.question-nav-controls{
  display: flex;
  flex-grow : 1;
  justify-content: center;
}
.nav-btn {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: #f8fbff;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
}

.nav-btn:hover:not(:disabled) {
  background: var(--color-button-hover);
}

.nav-btn:disabled {
  background: rgba(111, 135, 170, 0.65);
  cursor: not-allowed;
  color: rgba(248, 251, 255, 0.75);
}

.progress-bar {
  flex: 1;
  position: relative;
}

.question-counter {
  font-weight: 500;
  color: var(--color-muted);
}

.view-controls {
  margin: 5px 0;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 10px;
  display: flex;
  flex-direction: row;
  gap: 8px;
  align-items: center;
  padding: 5px;
  border: 1px solid var(--color-border-subtle);
  backdrop-filter: blur(6px);
}

.view-control-button {
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
  border: 1px solid transparent;
}

.view-controls .view-control-button:hover {
  background-color: rgba(22, 74, 150, 0.12);
}

.view-control-checkbox {
  /* Visually hide the checkbox but keep it accessible */
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  cursor: pointer;
}

.view-control-checkbox:checked + svg {
  stroke: var(--color-accent-secondary); /* Highlight color for active icon */
}

.view-controls .view-control-button svg {
  stroke: var(--color-muted); /* Default icon color */
}

.timer-section {
  margin-bottom: 20px;
}

.question-item {
  border: 2px solid var(--color-border-subtle);
  border-radius: 8px;
  padding: 20px;
  margin: 15px 0;
  transition: all 0.3s ease;
  position: relative;
  background: var(--color-surface);
  box-shadow: 0 12px 30px rgba(15, 57, 117, 0.08);
}

.question-item.correct {
  border-color: var(--color-accent-primary);
  background: linear-gradient(130deg, rgba(108, 168, 255, 0.18), rgba(255, 255, 255, 0.95));
  box-shadow: 0 18px 36px rgba(22, 74, 150, 0.1);
}

.question-item.incorrect {
  border-color: rgba(11, 31, 63, 0.4);
  background: linear-gradient(130deg, rgba(11, 31, 63, 0.08), rgba(255, 255, 255, 0.95));
}

.question-item.completed {
  border-color: rgba(31, 106, 216, 0.35);
  background: linear-gradient(120deg, rgba(214, 228, 255, 0.65), rgba(255, 255, 255, 0.9));
}

.question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.question-title {
  margin: 0;
  color: var(--color-accent-deep);
  font-size: 1.2em;
}

.question-status {
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8em;
  font-weight: 500;
}

.status-unanswered {
  background-color: rgba(22, 74, 150, 0.08);
  color: var(--color-muted);
}

.status-correct {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: #f8fbff;
}

.status-incorrect {
  background-color: rgba(11, 31, 63, 0.75);
  color: #f0f6ff;
}

.status-completed {
  background-color: rgba(31, 106, 216, 0.65);
  color: #f8fbff;
}

.question-feedback {
  margin: 10px 0;
  padding: 10px;
  border-radius: 4px;
  font-weight: 500;
}

.feedback-correct {
  background-color: rgba(108, 168, 255, 0.18);
  color: var(--color-accent-deep);
  border: 1px solid rgba(108, 168, 255, 0.45);
}

.feedback-incorrect {
  background-color: rgba(11, 31, 63, 0.12);
  color: var(--color-accent-deep);
  border: 1px solid rgba(11, 31, 63, 0.35);
}

.question-statement {
  margin-bottom: 20px;
  line-height: 1.6;
}

.question-inputs {
  margin-bottom: 20px;
  text-align: center;
}

.question-inputs h4 {
  text-align: center;
  margin-bottom: 15px;
  color: var(--color-accent-primary);
}

.input-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.input-list li {
  margin-bottom: 0;
  width: 100%;
  max-width: 400px;
}

.input-list .input {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}


                
        .feedback {
            padding: 8px 12px;
            border-radius: 4px;
            margin: 8px 0;
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 500;
            animation: fadeIn 0.3s ease-in;
            width: 100%;
            justify-content: center;
        }
        
        .feedback-success {
            background-color: rgba(108, 168, 255, 0.18);
            color: var(--color-accent-deep);
            border: 1px solid rgba(108, 168, 255, 0.45);
        }
        
        .feedback-error {
            background-color: rgba(11, 31, 63, 0.12);
            color: var(--color-accent-deep);
            border: 1px solid rgba(11, 31, 63, 0.3);
        }
        
        .feedback-neutral {
            background-color: rgba(22, 74, 150, 0.08);
            color: var(--color-muted);
            border: 1px solid var(--color-border);
        }
        
        .feedback-icon {
            font-size: 1.2em;
        }
        
        .correct-input {
            border-color: var(--color-accent-primary) !important;
            background-color: rgba(214, 228, 255, 0.6);
        }
        
        .incorrect-input {
            border-color: rgba(11, 31, 63, 0.4) !important;
            background-color: rgba(11, 31, 63, 0.08);
        }
        
        .submit-btn {
            padding: 8px 16px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.2s ease;
            min-width: 120px;
        }
        
        .submit-btn:not(:disabled) {
            background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
            color: #f8fbff;
        }
        
        .submit-btn:not(:disabled):hover {
            background-color: var(--color-button-hover);
        }
        
        .submit-btn:disabled {
            background-color: rgba(111, 135, 170, 0.65);
            color: rgba(248, 251, 255, 0.75);
            cursor: not-allowed;
        }
        
        input[type="text"] {
            width: 100%;
            padding: 10px;
            border: 2px solid var(--color-border);
            border-radius: 4px;
            font-size: 16px;
            text-align: center;
        }
        
        input[type="text"]:focus {
            outline: none;
            border-color: var(--color-accent-primary);
            box-shadow: 0 0 0 3px var(--color-focus-ring);
        }
        
        label {
            text-align: center;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--color-text);
        }
        
        .error {
            color: var(--color-accent-deep);
            font-size: 0.9em;
            text-align: center;
        }

.big-button {
  display: inline-block;
  padding: 15px 30px;
  font-size: 1.2em;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  color: #f8fbff;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}
.big-button:hover {
  background-color: var(--color-button-hover);
}
                
/* Small devices (e.g., iPhone 7 width 375px) */
@media (max-width: 500px) {
  body {
    font-size: 16px;
    height: auto;
    min-height: 100vh;
    overflow: auto; /* allow page to scroll */
  }

  main {
    width: 100vw;
    padding: 0 0.75rem;
  }

  content-question#main {
    max-width: 100%;
    padding: 0.75rem;
    border-radius: 6px;
    display: block;

  }

  .question-nav {
    gap: 8px;
    margin: 12px 0;
    padding: 4px;
  }

  .nav-btn {
    display: none;
  }
.question-counter {
  display: none;
}
  .progress-bar {
    margin: 0 10px;
  }

  .question-title {
    font-size: 1.05em;
  }

  .input-list li {
    max-width: 100%;
  }

  input[type="text"] {
    font-size: 15px;
    padding: 8px;
  }
}
#login-dialog{
  padding: 20px;
  border: none;
  border-radius: 8px;
  background-color: white;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
.more-actions{
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: #f8fbff;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  margin-top: 15px;
  font-size: xx-large;
}

/* Small devices (e.g., iPhone 7 width 375px) */
@media (max-width: 500px) {
  #main.split aside#main-aside{
    display: none;;
  }
  #main.split.started #main-aside {
    display: block;
  }

}
@media (max-height:500px) {
  #top, footer{
    display: none;
  }    
  
}

/* Matter of Math Game Styles */
.app-header {
  background: linear-gradient(130deg, var(--color-accent-deep) 0%, var(--color-accent-primary) 45%, var(--color-accent-secondary) 100%);
  color: #f8fbff;
  padding: 1.25rem 2rem;
  text-align: center;
  box-shadow: 0 18px 36px var(--color-shadow-strong);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.title-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.limit-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.game-title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-shadow: 0 6px 18px rgba(11, 31, 63, 0.35);
}

.rule-text {
  font-size: 0.95rem;
  opacity: 0.9;
  margin-top: 0.5rem;
}

.subtitle {
  font-size: 0.85rem;
  opacity: 0.8;
  margin-top: 0.25rem;
}

.layout {
  display: flex;
  flex: 1;
  gap: 1.5rem;
  padding: 1.5rem;
  overflow: auto;
}

.left-panel, .right-panel {
  flex: 1;
  min-width: 0;
}

.question-area {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 12px 30px rgba(15, 57, 117, 0.08);
  border: 1px solid var(--color-border-subtle);
}

.question-meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-subtle);
  width: fit-content;
  max-width: 100%;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.meta-item .label {
  font-size: 0.85rem;
  color: var(--color-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-item .value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-accent-primary);
}

.question-image-container {
  margin: 1.5rem 0;
  text-align: center;
  background: var(--color-surface);
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid var(--color-border-subtle);
}

.question-image-container.hidden {
  display: none;
}

.question-image-container img {
  max-width: 100%;
  max-height: 400px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(15, 57, 117, 0.1);
  object-fit: contain;
}

.question-card {
  background: var(--color-surface-alt);
  border-radius: 8px;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
}

.question-card.hidden {
  display: none;
}

.question-card h2 {
  margin: 0 0 1.5rem 0;
  color: var(--color-text);
  font-size: 1.3rem;
  line-height: 1.5;
  text-align: left;
}

.choices {
  margin: 1.5rem 0;
}

.choices-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.choice-btn {
  padding: 0.75rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.choice-btn:hover {
  border-color: var(--color-accent-primary);
  background: var(--color-accent-soft);
}

.choice-btn.selected {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: #f8fbff;
  border-color: var(--color-accent-primary);
  box-shadow: 0 4px 12px rgba(22, 74, 150, 0.2);
}

.choices-dropdown {
  display: none;
}

.choices-dropdown select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  font-size: 1rem;
  color: var(--color-text);
}

.choices-dropdown select:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.dropdown-tip {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
  font-style: italic;
}

.answer-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0;
}

.answer-input {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.answer-input input {
  flex: 1;
  padding: 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  text-align: center;
}

.answer-input input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.mark {
  font-size: 1.5rem;
  font-weight: bold;
  min-width: 2rem;
  text-align: center;
}

.mark.correct {
  color: var(--color-accent-primary);
}

.mark.incorrect {
  color: var(--color-accent-deep);
}

.hint-panel {
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--color-surface-alt);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.hint-panel.hidden {
  display: none;
}

.hint-panel button.small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

#hintsUsed {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

#hintsUsed > div {
  padding: 0.75rem;
  background: var(--color-surface);
  border-radius: 6px;
  border-left: 3px solid var(--color-accent-primary);
}

.feedback {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  text-align: center;
}

.actions-row {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.worksheet-summary {
  background: var(--color-surface-alt);
  border-radius: 8px;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
}

.worksheet-summary.hidden {
  display: none;
}

.worksheet-summary h3 {
  margin-top: 0;
  color: var(--color-accent-primary);
}

.explain {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 12px 30px rgba(15, 57, 117, 0.08);
  border: 1px solid var(--color-border-subtle);
  margin-bottom: 1.5rem;
}

.note {
  color: var(--color-muted);
  line-height: 1.6;
  text-align: left;
}

.note strong {
  color: var(--color-accent-primary);
}

.progress-log {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 12px 30px rgba(15, 57, 117, 0.08);
  border: 1px solid var(--color-border-subtle);
  max-height: 300px;
  overflow-y: auto;
  text-align: left;
}

.progress-log > div {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.progress-log > div:last-child {
  border-bottom: none;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 31, 63, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
  display: none;
}

.overlay.visible {
  display: flex;
}

.pause-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 31, 63, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

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

.pause-card {
  background: var(--color-surface);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 24px 50px rgba(15, 57, 117, 0.3);
  max-width: 400px;
  width: 90%;
  text-align: center;
  border: 1px solid var(--color-border-subtle);
}

.pause-card h2 {
  margin-top: 0;
  color: var(--color-accent-deep);
  font-size: 1.75rem;
}

.pause-card p {
  color: var(--color-muted);
  margin: 1.5rem 0;
}

.card {
  background: var(--color-surface);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 24px 50px rgba(15, 57, 117, 0.3);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--color-border-subtle);
}

.card h2 {
  margin-top: 0;
  color: var(--color-accent-deep);
  font-size: 1.75rem;
}

.card.setup form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card.setup label {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--color-text);
}

.card.setup input[type="text"],
.card.setup input[type="number"],
.card.setup input[type="file"] {
  padding: 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--color-surface-alt);
}

.card.setup input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.small-note {
  font-size: 0.85rem;
  color: var(--color-muted);
  font-style: italic;
  margin-top: -0.5rem;
}

.card.celebrate {
  text-align: center;
}

.card.celebrate h2 {
  color: var(--color-accent-primary);
  font-size: 2rem;
}

#confettiCanvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.score-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.score-table th,
.score-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-subtle);
}

.score-table th {
  background: var(--color-accent-soft);
  font-weight: 600;
  color: var(--color-accent-deep);
}

button.small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  border-radius: 6px;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s ease;
}

button.small:hover {
  border-color: var(--color-accent-primary);
  background: var(--color-accent-soft);
}

button.small:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 768px) {
  .layout {
    flex-direction: column;
    padding: 1rem;
  }
  
  .question-meta {
    justify-content: space-between;
  }
  
  .choices-buttons {
    grid-template-columns: 1fr;
  }
  
  .card {
    padding: 1.5rem;
    width: 95%;
  }
}