/* ===========================================================
   CodeKings Challenge — Professional Edition
   Dark / refined / code-academy feel.
   Muted accents, thin borders, restrained glow.
   =========================================================== */

:root {
  /* Surfaces */
  --ck-bg:        #0d1117;
  --ck-bg-2:      #111827;
  --ck-card:      #161b22;
  --ck-card-2:    #1c2128;
  --ck-border:    #30363d;
  --ck-border-hi: #484f58;

  /* Ink */
  --ck-text:      #e6edf3;
  --ck-text-dim:  #9ca3af;
  --ck-text-mute: #6b7280;

  /* Accents — muted, not laser */
  --ck-green:     #3fb950;   /* success / run button */
  --ck-green-hi:  #56d364;
  --ck-blue:      #58a6ff;   /* ai / links */
  --ck-blue-hi:   #79b8ff;
  --ck-amber:     #d29922;   /* warn */
  --ck-red:       #f85149;   /* error */
  --ck-violet:    #a371f7;   /* titles */

  /* Difficulty */
  --diff-easy:    #3fb950;
  --diff-med:     #58a6ff;
  --diff-hard:    #f778ba;

  /* Code surfaces — mirror VS Code dark */
  --code-bg:      #0d1117;
  --code-fg:      #e6edf3;
  --code-gutter:  #161b22;
  --code-line:    #6e7681;
  --code-active:  #1c2128;

  --font-ui:   'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--ck-bg);
  color: var(--ck-text);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.55;
  min-height: 100vh;
  /* Very subtle ambient gradient — no grid, no laser */
  background-image:
    radial-gradient(ellipse 1200px 600px at 50% -10%, rgba(88, 166, 255, 0.04), transparent 70%),
    radial-gradient(ellipse 800px 500px at 100% 100%, rgba(163, 113, 247, 0.03), transparent 70%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--ck-blue); text-decoration: none; }
a:hover { color: var(--ck-blue-hi); }

/* ---------- Layout ---------- */
.ck-challenge-grid {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 1.5rem;
  padding: 1.5rem;
  max-width: 1600px;
  margin: 0 auto;
}
@media (max-width: 980px) { .ck-challenge-grid { grid-template-columns: 1fr; } }

/* ---------- Left panel ---------- */
.ck-left { display: flex; flex-direction: column; gap: 1rem; }

.ck-breadcrumb {
  color: var(--ck-text-dim);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color .15s;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}
.ck-breadcrumb:hover { color: var(--ck-blue); }

.ck-badges { display: flex; gap: .4rem; flex-wrap: wrap; }
.ck-badge {
  display: inline-flex;
  align-items: center;
  padding: .25rem .65rem;
  border: 1px solid var(--ck-border);
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  background: var(--ck-card);
}
.ck-badge-easy   { color: var(--diff-easy);   border-color: rgba(63, 185, 80, 0.3); }
.ck-badge-medium { color: var(--diff-med);    border-color: rgba(88, 166, 255, 0.3); }
.ck-badge-hard   { color: var(--diff-hard);   border-color: rgba(247, 120, 186, 0.3); }
.ck-badge-topic  { color: var(--ck-text-dim); }
.ck-badge-done   { color: var(--ck-green); border-color: rgba(63, 185, 80, 0.4); background: rgba(63, 185, 80, 0.08); }

.ck-title {
  font-family: var(--font-ui);
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0;
  color: var(--ck-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* Scenario box */
.ck-scenario-box {
  background: var(--ck-card);
  border: 1px solid var(--ck-border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}
.ck-scenario-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ck-text-mute);
  margin-bottom: .5rem;
  font-family: var(--font-mono);
}
.ck-scenario-text {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--ck-text);
}

/* Requirements */
.ck-requirements-header {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ck-text-mute);
  font-family: var(--font-mono);
  margin-bottom: .2rem;
}
.ck-requirements-hint {
  font-size: 0.8rem;
  color: var(--ck-text-mute);
  margin-bottom: .65rem;
}
.ck-reqs { display: flex; flex-direction: column; gap: .5rem; }
.ck-req {
  display: flex;
  gap: .75rem;
  padding: .75rem .95rem;
  background: var(--ck-card);
  border: 1px solid var(--ck-border);
  border-radius: 6px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  align-items: flex-start;
}
.ck-req:hover {
  border-color: var(--ck-border-hi);
  background: var(--ck-card-2);
}
.ck-req-num {
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background: var(--ck-card-2);
  border: 1px solid var(--ck-border);
  color: var(--ck-text-dim);
  font-size: 0.72rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  transition: all .15s;
  margin-top: 1px;
}
.ck-req-text {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--ck-text);
}
.ck-req-text code {
  background: var(--code-bg);
  border: 1px solid var(--ck-border);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--ck-blue);
}
.ck-req-done {
  background: rgba(63, 185, 80, 0.06);
  border-color: rgba(63, 185, 80, 0.35);
}
.ck-req-done .ck-req-num {
  background: var(--ck-green);
  border-color: var(--ck-green);
  color: #0d1117;
}
.ck-req-done .ck-req-num::before { content: '✓'; font-weight: 700; }
.ck-req-done .ck-req-num { font-size: 0; }
.ck-req-done .ck-req-num::before { font-size: 0.75rem; }
.ck-req-done .ck-req-text {
  color: var(--ck-text-dim);
  text-decoration: line-through;
  text-decoration-color: rgba(156, 163, 175, 0.4);
}

/* Info card */
.ck-info-card {
  font-size: 0.82rem;
  color: var(--ck-text);
  padding: .75rem 1rem;
  background: var(--ck-card);
  border: 1px solid var(--ck-border);
  border-radius: 6px;
  line-height: 1.55;
}
.ck-info-card strong {
  display: block;
  color: var(--ck-text-mute);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: .08em;
  margin-bottom: .25rem;
  text-transform: uppercase;
}
.ck-info-card a { font-weight: 500; }

/* ---------- Right panel ---------- */
.ck-right {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.ck-editor-wrap {
  border: 1px solid var(--ck-border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--code-bg);
}
.ck-editor-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .5rem .85rem;
  background: var(--ck-card);
  border-bottom: 1px solid var(--ck-border);
}
.ck-filename {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ck-text-dim);
}
.ck-filename::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ck-green);
  display: inline-block;
}
.ck-editor-actions { display: flex; gap: .5rem; align-items: center; }
.ck-status-pill {
  font-size: 0.75rem;
  color: var(--ck-text-dim);
  font-family: var(--font-mono);
}
.ck-btn-ghost {
  padding: .35rem .7rem;
  background: transparent;
  border: 1px solid var(--ck-border);
  border-radius: 4px;
  font-size: 0.78rem;
  cursor: pointer;
  color: var(--ck-text-dim);
  font-family: var(--font-ui);
  transition: all .15s;
}
.ck-btn-ghost:hover {
  border-color: var(--ck-border-hi);
  color: var(--ck-text);
  background: var(--ck-card-2);
}

/* Native textarea fallback (shown until CodeMirror mounts) */
.ck-code {
  width: 100%;
  min-height: 320px;
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  background: var(--code-bg);
  color: var(--code-fg);
  border: none;
  outline: none;
  resize: vertical;
  tab-size: 4;
  caret-color: var(--ck-blue);
}

/* ---------- CodeMirror 5 custom skin ---------- */
.ck-editor-wrap .CodeMirror {
  height: auto;
  min-height: 320px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  background: var(--code-bg);
  color: var(--code-fg);
}
.ck-editor-wrap .CodeMirror-scroll { min-height: 320px; }
.ck-editor-wrap .CodeMirror-gutters {
  background: var(--code-gutter);
  border-right: 1px solid var(--ck-border);
}
.ck-editor-wrap .CodeMirror-linenumber {
  color: var(--code-line);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 0 .65rem 0 .5rem;
}
.ck-editor-wrap .CodeMirror-activeline-background { background: var(--code-active) !important; }
.ck-editor-wrap .CodeMirror-activeline-gutter .CodeMirror-linenumber { color: var(--ck-text); }
.ck-editor-wrap .CodeMirror-cursor { border-left: 2px solid var(--ck-blue); }
.ck-editor-wrap .CodeMirror-selected { background: rgba(88, 166, 255, 0.2) !important; }
.ck-editor-wrap .CodeMirror-matchingbracket { color: var(--ck-green-hi) !important; background: rgba(63, 185, 80, 0.12); border-bottom: 1px solid var(--ck-green); }

/* Python syntax colours — VS Code Dark+ inspired, tuned for readability */
.ck-editor-wrap .cm-keyword    { color: #ff7b72; font-weight: 500; }   /* def, class, if, for */
.ck-editor-wrap .cm-def        { color: #d2a8ff; }                      /* function/class names at def */
.ck-editor-wrap .cm-variable   { color: #e6edf3; }
.ck-editor-wrap .cm-variable-2 { color: #ffa657; }                      /* self, cls */
.ck-editor-wrap .cm-variable-3 { color: #79c0ff; }                      /* types */
.ck-editor-wrap .cm-property   { color: #79c0ff; }
.ck-editor-wrap .cm-operator   { color: #ff7b72; }
.ck-editor-wrap .cm-number     { color: #79c0ff; }
.ck-editor-wrap .cm-string     { color: #a5d6ff; }
.ck-editor-wrap .cm-string-2   { color: #a5d6ff; }
.ck-editor-wrap .cm-comment    { color: #8b949e; font-style: italic; }
.ck-editor-wrap .cm-builtin    { color: #d2a8ff; }                      /* print, len, range */
.ck-editor-wrap .cm-atom       { color: #79c0ff; }                      /* True, False, None */
.ck-editor-wrap .cm-meta       { color: #79c0ff; }                      /* decorators */
.ck-editor-wrap .cm-tag        { color: #7ee787; }
.ck-editor-wrap .cm-bracket    { color: #e6edf3; }
.ck-editor-wrap .cm-punctuation{ color: #e6edf3; }
.ck-editor-wrap .cm-error      { color: var(--ck-red); background: rgba(248, 81, 73, 0.1); }

/* Placeholder (empty editor hint) */
.ck-editor-wrap .CodeMirror-placeholder {
  color: var(--ck-text-mute) !important;
  font-style: italic;
}

/* ---------- Buttons ---------- */
.ck-button-row {
  display: flex;
  gap: .75rem;
  align-items: center;
  flex-wrap: wrap;
}
.ck-btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .55rem 1.1rem;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  font-family: var(--font-ui);
  transition: all .15s ease;
  background: transparent;
}
.ck-btn:disabled { opacity: .5; cursor: not-allowed; }
.ck-btn-run {
  background: var(--ck-green);
  color: #0d1117;
  border-color: var(--ck-green);
}
.ck-btn-run:not(:disabled):hover {
  background: var(--ck-green-hi);
  border-color: var(--ck-green-hi);
}
.ck-btn-ai {
  background: var(--ck-card);
  color: var(--ck-blue);
  border-color: var(--ck-border);
}
.ck-btn-ai:not(:disabled):hover {
  border-color: var(--ck-blue);
  background: var(--ck-card-2);
}
.ck-kbd {
  display: inline-flex;
  align-items: center;
  padding: 1px 5px;
  margin-left: .35rem;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  line-height: 1.3;
}
.ck-btn-run .ck-kbd { background: rgba(0, 0, 0, 0.18); border-color: rgba(0, 0, 0, 0.25); }

/* ---------- Console ---------- */
.ck-console-wrap {
  border: 1px solid var(--ck-border);
  border-radius: 8px;
  overflow: hidden;
}
.ck-console-bar {
  padding: .5rem .85rem;
  background: var(--ck-card);
  border-bottom: 1px solid var(--ck-border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ck-text-dim);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.ck-console-bar::before {
  content: '●';
  color: var(--ck-green);
  font-size: 0.6rem;
}
.ck-console {
  background: var(--code-bg);
  color: var(--code-fg);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 1rem 1.25rem;
  min-height: 180px;
  max-height: 380px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}
.ck-console:empty::before {
  content: 'Click Execute to run your code.';
  color: var(--ck-text-mute);
  font-style: italic;
}
.ck-line { white-space: pre-wrap; }
.ck-stdout { color: var(--code-fg); }
.ck-stdin  { color: var(--ck-green-hi); }
.ck-error  { color: var(--ck-red); }
.ck-system { color: var(--ck-text-mute); font-style: italic; }

.ck-input-row {
  display: flex;
  align-items: center;
  gap: .35rem;
  margin-top: .15rem;
}
.ck-input-prompt {
  color: var(--ck-blue);
  font-weight: 600;
  flex: 0 0 auto;
}
.ck-input-field {
  flex: 1 1 auto;
  background: transparent;
  border: none;
  outline: none;
  color: var(--ck-green-hi);
  font-family: inherit;
  font-size: inherit;
  padding: 1px 3px;
  border-bottom: 1px solid var(--ck-border);
  caret-color: var(--ck-blue);
}
.ck-input-field:focus { border-bottom-color: var(--ck-blue); }
.ck-input-field::placeholder { color: var(--ck-text-mute); font-style: italic; }

/* ---------- Feedback ---------- */
.ck-feedback-card {
  padding: 1.15rem 1.3rem;
  border-radius: 8px;
  background: var(--ck-card);
  border: 1px solid var(--ck-border);
  border-left: 3px solid var(--ck-blue);
}
.ck-feedback-card.ck-tone-pass { border-left-color: var(--ck-green); }
.ck-feedback-card.ck-tone-warn { border-left-color: var(--ck-amber); }
.ck-feedback-card.ck-tone-fail { border-left-color: var(--ck-red); }

.ck-feedback-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .75rem;
  gap: 1rem;
}
.ck-feedback-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ck-text);
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}
.ck-feedback-title::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ck-blue);
}
.ck-tone-pass .ck-feedback-title::before { background: var(--ck-green); }
.ck-tone-warn .ck-feedback-title::before { background: var(--ck-amber); }
.ck-tone-fail .ck-feedback-title::before { background: var(--ck-red); }

.ck-score-pill {
  padding: .25rem .7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  background: var(--ck-card-2);
  border: 1px solid var(--ck-border);
  color: var(--ck-text-dim);
}
.ck-score-pill.ck-tone-pass { color: var(--ck-green); border-color: rgba(63, 185, 80, 0.35); }
.ck-score-pill.ck-tone-warn { color: var(--ck-amber); border-color: rgba(210, 153, 34, 0.35); }
.ck-score-pill.ck-tone-fail { color: var(--ck-red);   border-color: rgba(248, 81, 73, 0.35); }

.ck-feedback-body {
  color: var(--ck-text);
  line-height: 1.6;
  font-size: 0.88rem;
}
.ck-feedback-note {
  margin-top: .75rem;
  font-size: 0.78rem;
  color: var(--ck-text-mute);
  border-top: 1px solid var(--ck-border);
  padding-top: .6rem;
}

.ck-feedback-loading {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--ck-text-dim);
  font-size: 0.88rem;
}
.ck-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--ck-border);
  border-top-color: var(--ck-blue);
  border-radius: 50%;
  animation: ck-spin .7s linear infinite;
}
@keyframes ck-spin { to { transform: rotate(360deg); } }
.ck-feedback-err { color: var(--ck-red); }

/* Rewards */
.ck-rewards {
  margin-top: .9rem;
  padding-top: .9rem;
  border-top: 1px solid var(--ck-border);
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}
.ck-reward {
  padding: .3rem .7rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  border: 1px solid var(--ck-border);
  background: var(--ck-card-2);
  animation: ck-reward-pop .5s ease backwards;
}
.ck-reward:nth-child(2) { animation-delay: .1s; }
.ck-reward:nth-child(3) { animation-delay: .2s; }
.ck-exp   { color: var(--ck-amber);  border-color: rgba(210, 153, 34, 0.35); }
.ck-coin  { color: var(--ck-blue);   border-color: rgba(88, 166, 255, 0.35); }
.ck-first { color: var(--ck-violet); border-color: rgba(163, 113, 247, 0.35); }
@keyframes ck-reward-pop {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0);   }
}

/* ---------- Popup (toast) ---------- */
.ck-popup {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  left: auto;
  transform: translateX(20px);
  background: var(--ck-card);
  border: 1px solid var(--ck-border);
  border-radius: 8px;
  padding: .75rem 1rem;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  transition: opacity .25s ease, transform .25s ease;
  max-width: 380px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}
.ck-popup-show { opacity: 1; transform: translateX(0); }
.ck-popup-success { border-left: 3px solid var(--ck-green); }
.ck-popup-error   { border-left: 3px solid var(--ck-red); }
.ck-popup-nomatch { border-left: 3px solid var(--ck-amber); }
.ck-popup-info    { border-left: 3px solid var(--ck-blue); }

/* Confetti — keep it subtle */
.ck-confetti {
  position: fixed;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  z-index: 9998;
  pointer-events: none;
  animation: ck-confetti-fly 1s ease-out forwards;
}
@keyframes ck-confetti-fly {
  to {
    transform: translate(var(--dx), var(--dy)) rotate(540deg);
    opacity: 0;
  }
}

/* ---------- Scrollbars (dark) ---------- */
.ck-console::-webkit-scrollbar,
.ck-editor-wrap .CodeMirror-scroll::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
.ck-console::-webkit-scrollbar-track,
.ck-editor-wrap .CodeMirror-scroll::-webkit-scrollbar-track {
  background: var(--code-bg);
}
.ck-console::-webkit-scrollbar-thumb,
.ck-editor-wrap .CodeMirror-scroll::-webkit-scrollbar-thumb {
  background: var(--ck-border);
  border-radius: 5px;
}
.ck-console::-webkit-scrollbar-thumb:hover,
.ck-editor-wrap .CodeMirror-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--ck-border-hi);
}