@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&family=Share+Tech+Mono&family=Fredoka:wght@400;500;600;700&display=swap');

:root {
  --bg: #0a0a1a;
  --surface: #141430;
  --primary: #b388ff;
  --secondary: #69f0ae;
  --warning: #ffbe0b;
  --error: #ff5252;
  --text: #e0e0e0;
  --code-bg: #1a1a3e;
  --border: #2a2a50;
  --text-dim: #7a7a9a;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Fredoka', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: 'Press Start 2P', monospace;
  font-weight: 400;
}

code, pre, .code-font {
  font-family: 'Share Tech Mono', monospace;
}

.hidden {
  display: none !important;
}

/* CRT scanline overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    transparent, transparent 3px,
    rgba(0, 0, 0, 0.04) 3px, rgba(0, 0, 0, 0.04) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* === LANDING SCREEN === */
.landing-screen {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 24px 40px;
}

.landing-screen h1 {
  font-size: 40px;
  color: var(--primary);
  text-shadow: 0 0 30px rgba(179, 136, 255, 0.6), 0 0 60px rgba(179, 136, 255, 0.3);
  text-align: center;
  letter-spacing: 4px;
  margin-bottom: 16px;
}

.tagline {
  font-family: 'Fredoka', sans-serif;
  font-size: 18px;
  color: var(--text-dim);
  text-align: center;
  margin-bottom: 48px;
}

.grokset-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.grokset-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  text-decoration: none;
  color: inherit;
}

.grokset-card:hover {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(179, 136, 255, 0.2);
  background: rgba(179, 136, 255, 0.05);
}

.grokset-card.suggested {
  border-color: var(--secondary);
  box-shadow: 0 0 16px rgba(105, 240, 174, 0.2);
}

.grokset-card.suggested:hover {
  box-shadow: 0 0 28px rgba(105, 240, 174, 0.35);
}

.grokset-card.complete {
  border-color: var(--secondary);
  opacity: 0.85;
}

.grokset-card.stub {
  cursor: default;
  opacity: 0.45;
}

.grokset-card.stub:hover {
  border-color: var(--border);
  box-shadow: none;
  background: var(--surface);
}

.grokset-number {
  font-family: 'Press Start 2P', monospace;
  font-size: 12px;
  color: var(--text-dim);
  width: 28px;
  flex-shrink: 0;
  text-align: center;
}

.grokset-card.suggested .grokset-number {
  color: var(--secondary);
}

.grokset-info {
  flex: 1;
  min-width: 0;
}

.grokset-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 14px;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.4;
}

.grokset-desc {
  font-size: 16px;
  color: var(--text-dim);
  line-height: 1.4;
}

.grokset-progress {
  font-family: 'Share Tech Mono', monospace;
  font-size: 18px;
  color: var(--text-dim);
  flex-shrink: 0;
  text-align: right;
}

.grokset-progress.done {
  color: var(--secondary);
  text-shadow: 0 0 8px rgba(105, 240, 174, 0.5);
}

.grokset-progress.in-progress {
  color: var(--primary);
}

.coming-soon-badge {
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  background: rgba(42, 42, 80, 0.8);
  padding: 3px 8px;
  border-radius: 4px;
  flex-shrink: 0;
}

/* === EXERCISE SCREEN === */
.exercise-screen {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Top bar */
.top-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}

.back-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  padding: 8px 14px;
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text-dim);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}

.back-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.top-bar-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 13px;
  color: var(--primary);
  text-shadow: 0 0 10px rgba(179, 136, 255, 0.5);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exercise-counter {
  font-family: 'Share Tech Mono', monospace;
  font-size: 14px;
  color: var(--text-dim);
  flex-shrink: 0;
}

/* Progress dots */
.progress-dots {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.progress-dot {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--border);
  border: 2px solid var(--border);
  cursor: default;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
  flex-shrink: 0;
}

.progress-dot.reachable {
  cursor: pointer;
}

.progress-dot.completed {
  background: var(--secondary);
  border-color: var(--secondary);
}

.progress-dot.completed:hover {
  box-shadow: 0 0 8px rgba(105, 240, 174, 0.6);
}

.progress-dot.reachable:not(.completed):hover {
  border-color: var(--text-dim);
}

.progress-dot.current {
  background: transparent;
  border-color: var(--primary);
  box-shadow: 0 0 8px rgba(179, 136, 255, 0.6);
}

/* Exercise content area */
.exercise-content {
  flex: 1;
  overflow-y: auto;
  padding: 28px 20px;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}

/* === EXPLANATION EXERCISE === */
.explanation-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.explanation-code-panel {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.explanation-code-panel pre {
  padding: 20px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  overflow-x: auto;
}

.code-line {
  display: block;
  padding: 8px 6px;
  border-radius: 4px;
  transition: background 0.2s, opacity 0.2s;
  position: relative;
  white-space: pre;
  border-left: 5px solid transparent;
}

.code-line.highlighted {
  background: rgba(179, 136, 255, 0.2);
  border-left: 5px solid var(--primary);
  cursor: pointer;
  border-radius: 0;
}

.code-line.highlighted.group-start {
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}

.code-line.highlighted.group-end {
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
}

.code-line .highlight-badge {
  position: absolute;
  top: 8px;
  right: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--bg);
  font-family: 'Fredoka', sans-serif;
  font-size: 13px;
  font-weight: 600;
  margin-right: 6px;
  vertical-align: middle;
  flex-shrink: 0;
}

.explanation-layout.has-focus .code-line.highlighted:not(.focus) {
  opacity: 0.4;
}

.explanation-layout.has-focus .code-line.highlighted.focus {
  background: rgba(179, 136, 255, 0.35);
  border-left: 5px solid var(--secondary);
}

.explanation-text-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 18px;
}

.explanation-title {
  font-size: 14px;
  color: var(--primary);
  text-shadow: 0 0 10px rgba(179, 136, 255, 0.4);
  line-height: 1.5;
  margin-bottom: 4px;
}

.explanation-content {
  font-size: 18px;
  color: var(--text);
  line-height: 1.7;
}

.highlight-note {
  background: rgba(179, 136, 255, 0.08);
  border-left: 3px solid var(--primary);
  padding: 10px 14px;
  border-radius: 0 4px 4px 0;
  color: var(--text);
  line-height: 1.5;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s, border-left-color 0.2s;
}

.highlight-note .highlight-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--bg);
  font-family: 'Fredoka', sans-serif;
  font-size: 12px;
  font-weight: 600;
  margin-right: 8px;
  vertical-align: middle;
  flex-shrink: 0;
}

.explanation-layout.has-focus .highlight-note:not(.focus) {
  opacity: 0.4;
}

.explanation-layout.has-focus .highlight-note.focus {
  background: rgba(179, 136, 255, 0.2);
  border-left-color: var(--secondary);
}

.explanation-layout.has-focus .highlight-note.focus .highlight-badge,
.explanation-layout.has-focus .code-line.focus .highlight-badge {
  background: var(--secondary);
}

.got-it-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 11px;
  padding: 14px 28px;
  background: rgba(105, 240, 174, 0.1);
  border: 2px solid var(--secondary);
  color: var(--secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
  align-self: flex-start;
}

.got-it-btn:hover:not(:disabled) {
  background: rgba(105, 240, 174, 0.2);
  box-shadow: 0 0 20px rgba(105, 240, 174, 0.4);
}

.got-it-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* === STEPPER EXERCISE === */
.stepper-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.stepper-code-panel pre {
  padding: 20px;
  margin-bottom: 12px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 18px;
  line-height: 1.9;
  color: var(--text);
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow-x: auto;
}

.stepper-code-line {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 1px 4px;
  border-radius: 3px;
  transition: background 0.2s;
  border-left: 4px solid transparent;
}

.stepper-line-num {
  font-size: 13px;
  color: var(--text-dim);
  width: 20px;
  text-align: right;
  flex-shrink: 0;
  user-select: none;
}

.stepper-line-text {
  white-space: pre;
}

.stepper-code-line.current {
  background: rgba(179, 136, 255, 0.2);
  border-left: 4px solid var(--primary);
}

.stepper-code-line.current .stepper-line-num {
  color: var(--primary);
}

.stepper-code-line.executed {
  opacity: 0.5;
}

.stepper-right-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stepper-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.stepper-section-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  color: var(--text-dim);
  padding: 8px 14px;
  background: rgba(42, 42, 80, 0.5);
  border-bottom: 1px solid var(--border);
  letter-spacing: 1px;
}

.stepper-vars-table {
  padding: 12px 14px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 18px;
  min-height: 48px;
}

.var-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 3px 0;
}

.var-name {
  color: var(--primary);
  min-width: 80px;
}

.var-equals {
  color: var(--text-dim);
}

.var-value {
  color: var(--secondary);
  transition: color 0.3s;
}

.var-value.flash {
  color: var(--warning);
  text-shadow: 0 0 8px rgba(255, 190, 11, 0.6);
}

.stepper-eval {
  padding: 12px 14px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 18px;
  color: var(--warning);
  min-height: 46px;
  line-height: 1.2;
}

.stepper-output {
  padding: 12px 14px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 18px;
  color: var(--text);
  min-height: 46px;
  line-height: 1.2;
}

.output-line {
  display: block;
}

.output-line.flash {
  color: var(--secondary);
  text-shadow: 0 0 8px rgba(105, 240, 174, 0.5);
}

/* Stepper controls */
.stepper-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 4px;
}

.stepper-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 20px;
  padding: 3px 14px 8px;
  background: transparent;
  border: 2px solid var(--secondary);
  color: var(--secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, box-shadow 0.15s;
}

.stepper-btn.stepper-reset {
  padding: 4px 14px;
}

.stepper-btn:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 10px rgba(179, 136, 255, 0.3);
}

.stepper-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}


/* === QUIZ-CHOICE EXERCISE === */
.quiz-layout {
  max-width: 640px;
}

.quiz-title {
  font-size: 12px;
  color: var(--primary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.quiz-question {
  font-size: 17px;
  color: var(--text);
  line-height: 1.6;
}

.quiz-code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 20px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 20px;
  overflow-x: auto;
  white-space: pre;
}

.quiz-choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.choice-btn {
  font-family: 'Fredoka', sans-serif;
  font-size: 16px;
  padding: 14px 20px;
  background: var(--surface);
  border: 2px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}

.choice-btn:hover:not(:disabled) {
  border-color: var(--primary);
  background: rgba(179, 136, 255, 0.08);
  box-shadow: 0 0 12px rgba(179, 136, 255, 0.2);
}

.choice-btn:disabled {
  cursor: not-allowed;
}

.choice-btn.correct {
  border-color: var(--secondary);
  background: rgba(105, 240, 174, 0.1);
  color: var(--secondary);
}

.choice-btn.wrong {
  border-color: var(--error);
  background: rgba(255, 82, 82, 0.1);
  color: var(--error);
}

.quiz-feedback {
  font-size: 15px;
  padding: 12px 16px;
  border-radius: 6px;
  line-height: 1.5;
}

.quiz-feedback.correct {
  background: rgba(105, 240, 174, 0.1);
  border: 1px solid var(--secondary);
  color: var(--secondary);
}

.quiz-feedback.wrong {
  background: rgba(255, 82, 82, 0.08);
  border: 1px solid var(--error);
  color: var(--error);
}

/* === QUIZ-CODE EXERCISE === */
.quiz-code-layout {
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.quiz-code-editor-wrap {
  border: 2px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.quiz-code-editor-wrap:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 12px rgba(179, 136, 255, 0.2);
}

.quiz-code-editor-wrap .CodeMirror {
  height: auto;
  min-height: 160px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 18px;
}

.quiz-code-area {
  height: auto;
}

.run-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 11px;
  padding: 12px 28px;
  background: rgba(105, 240, 174, 0.1);
  border: 2px solid var(--secondary);
  color: var(--secondary);
  border-radius: 4px;
  cursor: pointer;
  align-self: flex-start;
  transition: background 0.15s, box-shadow 0.15s;
}

.run-btn:hover:not(:disabled) {
  background: rgba(105, 240, 174, 0.2);
  box-shadow: 0 0 18px rgba(105, 240, 174, 0.4);
}

.run-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.code-result {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 18px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  min-height: 48px;
  white-space: pre-wrap;
}

.code-result.success {
  border-color: var(--secondary);
  background: rgba(105, 240, 174, 0.06);
  color: var(--secondary);
}

.code-result.failure {
  border-color: var(--error);
  background: rgba(255, 82, 82, 0.06);
  color: var(--error);
}

.code-result.output {
  color: var(--text);
}

/* === WRONG-ANSWER NUDGE BUBBLE === */
.wrong-help-bubble {
  position: fixed;
  bottom: 90px;
  right: 8px;
  width: 190px;
  background: var(--surface);
  border: 2px solid var(--error);
  border-radius: 12px;
  padding: 12px 14px;
  z-index: 98;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: 0 0 20px rgba(255, 68, 68, 0.2);
  animation: bubbleIn 0.2s ease-out;
}

.wrong-help-bubble::after {
  content: '';
  position: absolute;
  bottom: -10px;
  right: 30px;
  border: 9px solid transparent;
  border-top-color: var(--error);
  border-bottom: none;
}

@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.wrong-bubble-review-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 8px;
  line-height: 1.6;
  padding: 8px 10px;
  background: rgba(255, 68, 68, 0.1);
  border: 1.5px solid var(--error);
  border-radius: 8px;
  color: var(--error);
  cursor: pointer;
  text-align: left;
  transition: background 0.15s;
}
.wrong-bubble-review-btn:hover {
  background: rgba(255, 68, 68, 0.2);
}

.wrong-bubble-help-hint {
  font-family: 'Press Start 2P', monospace;
  font-size: 8px;
  line-height: 1.6;
  color: var(--warning);
  text-align: center;
}

/* === HELP PANEL === */
.help-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  font-family: 'Press Start 2P', monospace;
  font-size: 10px;
  width: 52px;
  height: 52px;
  background: rgba(255, 190, 11, 0.1);
  border: 2px solid var(--warning);
  color: var(--warning);
  border-radius: 50%;
  cursor: pointer;
  z-index: 100;
  transition: background 0.15s, box-shadow 0.15s;
  box-shadow: 0 0 16px rgba(255, 190, 11, 0.25);
}

.help-btn:hover {
  background: rgba(255, 190, 11, 0.2);
  box-shadow: 0 0 28px rgba(255, 190, 11, 0.5);
}

.help-panel {
  position: fixed;
  bottom: 88px;
  right: 24px;
  width: 450px;
  background: var(--surface);
  border: 2px solid var(--warning);
  border-radius: 8px;
  padding: 16px;
  z-index: 100;
  box-shadow: 0 0 30px rgba(255, 190, 11, 0.2);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.help-panel-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 12px;
  color: var(--warning);
  text-shadow: 0 0 8px rgba(255, 190, 11, 0.4);
  letter-spacing: 1px;
}

.help-textarea {
  width: 100%;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: 'Fredoka', sans-serif;
  font-size: 16px;
  padding: 10px 12px;
  resize: vertical;
  min-height: 72px;
  outline: none;
  transition: border-color 0.15s;
}

.help-textarea:focus {
  border-color: var(--warning);
}

.help-ask-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 12px;
  padding: 10px 16px;
  background: rgba(255, 190, 11, 0.1);
  border: 2px solid var(--warning);
  color: var(--warning);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
  align-self: flex-end;
}

.help-ask-btn:hover:not(:disabled) {
  background: rgba(255, 190, 11, 0.2);
  box-shadow: 0 0 14px rgba(255, 190, 11, 0.4);
}

.help-ask-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.help-cooldown {
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
}

.help-response {
  font-size: 17px;
  color: var(--text);
  line-height: 1.6;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 12px;
  max-height: 180px;
  overflow-y: auto;
}

/* === CELEBRATION SCREEN === */
.celebration-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 24px;
  text-align: center;
  gap: 20px;
}

.celebration-title {
  font-size: 20px;
  color: var(--secondary);
  text-shadow: 0 0 30px rgba(105, 240, 174, 0.6), 0 0 60px rgba(105, 240, 174, 0.3);
  line-height: 1.5;
  margin-bottom: 8px;
}

.celebration-subtitle {
  font-size: 18px;
  color: var(--text);
  margin-bottom: 24px;
}

.celebration-back-btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 11px;
  padding: 16px 32px;
  background: rgba(179, 136, 255, 0.1);
  border: 2px solid var(--primary);
  color: var(--primary);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
}

.celebration-back-btn:hover {
  background: rgba(179, 136, 255, 0.2);
  box-shadow: 0 0 24px rgba(179, 136, 255, 0.5);
}

/* === RESPONSIVE === */
@media (max-width: 700px) {
  .explanation-layout,
  .stepper-layout {
    grid-template-columns: 1fr;
  }

  .landing-screen h1 {
    font-size: 28px;
  }

  .grokset-card {
    gap: 12px;
    padding: 14px 16px;
  }

  .grokset-title {
    font-size: 10px;
  }

  .help-panel {
    width: calc(100vw - 48px);
    right: 16px;
    bottom: 80px;
  }

  .help-btn {
    right: 16px;
    bottom: 16px;
  }
}