/* ============================================================
   Shared interactive-widget styles. Inherits lesson CSS vars:
     --color-bg --color-surface --color-surface-2 --color-surface-3
     --color-primary --color-accent --color-success --color-warning
     --color-text --color-text-muted --color-text-dim --color-border
     --color-code-bg --font-sans --font-mono --radius --radius-sm
   Fallback values keep widgets usable on pages that don't set them.
   ============================================================ */

:root {
  --w-card-bg: var(--color-surface, #131927);
  --w-card-bg-2: var(--color-surface-2, #1c2538);
  --w-border: var(--color-border, #2a3449);
  --w-primary: var(--color-primary, #5b9dff);
  --w-success: var(--color-success, #10b981);
  --w-warning: var(--color-warning, #f59e0b);
  --w-text: var(--color-text, #e6ebf5);
  --w-text-muted: var(--color-text-muted, #8b95aa);
  --w-text-dim: var(--color-text-dim, #5d6a85);
  --w-mono: var(--font-mono, "JetBrains Mono", monospace);
  --w-radius: var(--radius, 10px);
  --w-radius-sm: var(--radius-sm, 6px);
}

/* ------------------------------ base card ------------------------------ */
.w-card {
  background: var(--w-card-bg);
  border: 1px solid var(--w-border);
  border-radius: var(--w-radius);
  padding: 18px 20px;
  margin: 22px 0;
}

.w-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--w-primary);
  margin-bottom: 10px;
}
.w-label::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--w-primary);
}
.w-label.done::before { background: var(--w-success); }
.w-prompt { color: var(--w-text); margin-bottom: 12px; }
.w-prompt code {
  font-family: var(--w-mono);
  background: var(--color-code-bg, #0d1220);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: #7dd3fc;
}

/* ------------------------------ inputs --------------------------------- */
.w-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.w-input {
  flex: 1;
  min-width: 120px;
  background: var(--color-code-bg, #0d1220);
  color: var(--w-text);
  border: 1px solid var(--w-border);
  border-radius: var(--w-radius-sm);
  padding: 10px 12px;
  font-family: var(--w-mono);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}
.w-input:focus { border-color: var(--w-primary); }
.w-input.correct { border-color: var(--w-success); }
.w-input.wrong { border-color: var(--w-warning); }

.w-btn {
  background: var(--w-primary);
  color: #0a0e1a;
  border: none;
  border-radius: var(--w-radius-sm);
  padding: 10px 18px;
  font-family: var(--font-sans, inherit);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
}
.w-btn:hover { filter: brightness(1.1); }
.w-btn:active { transform: translateY(1px); }
.w-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.w-btn-ghost {
  background: transparent;
  color: var(--w-text-muted);
  border: 1px solid var(--w-border);
}
.w-btn-ghost:hover { color: var(--w-text); border-color: var(--w-primary); }

/* ------------------------------ feedback ------------------------------- */
.w-feedback {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: var(--w-radius-sm);
  font-size: 14px;
  display: none;
}
.w-feedback.show { display: block; }
.w-feedback.ok {
  background: rgba(16, 185, 129, 0.12);
  border-left: 3px solid var(--w-success);
  color: var(--w-text);
}
.w-feedback.no {
  background: rgba(245, 158, 11, 0.12);
  border-left: 3px solid var(--w-warning);
  color: var(--w-text);
}
.w-feedback .hint { color: var(--w-text-muted); font-size: 13px; margin-top: 6px; }
.w-feedback code {
  font-family: var(--w-mono);
  background: var(--color-code-bg, #0d1220);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.9em;
}

/* ------------------------------ choices -------------------------------- */
.w-choices { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
.w-choice {
  flex: 1;
  min-width: 100px;
  background: var(--w-card-bg-2);
  color: var(--w-text);
  border: 1px solid var(--w-border);
  border-radius: var(--w-radius-sm);
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
  font-family: inherit;
}
.w-choice:hover { border-color: var(--w-primary); }
.w-choice.selected { border-color: var(--w-primary); background: rgba(91, 157, 255, 0.1); }
.w-choice.correct { border-color: var(--w-success); background: rgba(16, 185, 129, 0.12); }
.w-choice.wrong { border-color: var(--w-warning); background: rgba(245, 158, 11, 0.12); }
.w-choice:disabled { cursor: not-allowed; }

/* ------------------------------ code cells ----------------------------- */
.w-code {
  background: var(--color-code-bg, #0d1220);
  border: 1px solid var(--w-border);
  border-radius: var(--w-radius-sm);
  overflow: hidden;
}
.w-code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--w-card-bg-2);
  border-bottom: 1px solid var(--w-border);
  font-size: 12px;
  color: var(--w-text-muted);
  font-family: var(--w-mono);
}
.w-editor {
  width: 100%;
  min-height: 80px;
  background: var(--color-code-bg, #0d1220);
  color: var(--w-text);
  border: none;
  padding: 14px;
  font-family: var(--w-mono);
  font-size: 14px;
  line-height: 1.55;
  resize: vertical;
  outline: none;
  tab-size: 4;
}
.w-code-footer {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  background: var(--w-card-bg-2);
  border-top: 1px solid var(--w-border);
}
.w-code-status {
  font-size: 12px;
  color: var(--w-text-muted);
  font-family: var(--w-mono);
  flex: 1;
}
.w-output {
  background: #060912;
  border-top: 1px solid var(--w-border);
  padding: 14px;
  font-family: var(--w-mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--w-text);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 300px;
  overflow-y: auto;
  display: none;
}
.w-output.show { display: block; }
.w-output.err { color: #fca5a5; }
.w-output.match-ok { border-left: 3px solid var(--w-success); }
.w-output.match-no { border-left: 3px solid var(--w-warning); }

/* ------------------------------ embed ---------------------------------- */
.w-embed {
  border: 1px solid var(--w-border);
  border-radius: var(--w-radius-sm);
  overflow: hidden;
  background: var(--w-card-bg);
  margin: 22px 0;
}
.w-embed-header {
  padding: 10px 14px;
  background: var(--w-card-bg-2);
  border-bottom: 1px solid var(--w-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}
.w-embed-header a { color: var(--w-primary); text-decoration: none; font-size: 12px; }
.w-embed-header a:hover { text-decoration: underline; }
.w-embed iframe {
  width: 100%;
  border: none;
  display: block;
  background: var(--w-card-bg);
}

/* ------------------------------ scratch pad ---------------------------- */
.w-scratch-toggle {
  background: transparent;
  color: var(--w-text-dim);
  border: 1px solid var(--w-border);
  border-radius: var(--w-radius-sm);
  padding: 8px 12px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.w-scratch-toggle:hover { color: var(--w-text); border-color: var(--w-primary); }
.w-scratch-toggle.active {
  color: var(--w-primary);
  border-color: var(--w-primary);
  background: rgba(91, 157, 255, 0.08);
}
.w-row-scratch { margin-top: 10px; justify-content: flex-end; }

.w-scratch {
  display: none;
  width: 100%;
  margin-top: 10px;
  background: rgba(13, 18, 32, 0.5);
  color: var(--w-text);
  border: 1px dashed var(--w-border);
  border-radius: var(--w-radius-sm);
  padding: 10px 12px;
  font-family: var(--w-mono);
  font-size: 13px;
  line-height: 1.55;
  resize: vertical;
  outline: none;
  min-height: 60px;
}
.w-scratch.open { display: block; }
.w-scratch:focus { border-color: var(--w-primary); border-style: solid; }

/* ------------------------------ quiz wrapper --------------------------- */
.w-quiz {
  background: var(--w-card-bg);
  border: 1px solid var(--w-border);
  border-radius: var(--w-radius);
  padding: 22px 22px 10px;
  margin: 28px 0;
}
.w-quiz > .w-card {
  background: var(--w-card-bg-2);
  margin: 16px 0;
}
.w-quiz-header {
  margin-bottom: 10px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--w-border);
}
.w-quiz-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--w-text-muted);
  margin-bottom: 10px;
}
.w-quiz-progress {
  position: relative;
  height: 28px;
  background: var(--color-code-bg, #0d1220);
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--w-border);
}
.w-quiz-bar {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: linear-gradient(90deg, var(--w-primary), var(--w-success));
  transition: width 0.45s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.w-quiz-count {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-family: var(--w-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--w-text);
  mix-blend-mode: normal;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
}
.w-quiz-banner {
  margin-top: 14px;
  padding: 12px 16px;
  background: rgba(16, 185, 129, 0.14);
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: var(--w-radius-sm);
  color: var(--w-text);
  font-size: 14px;
  animation: w-pop 0.4s ease;
}
.w-quiz-done { border-color: rgba(16, 185, 129, 0.5); }

/* ------------------------------ paginated quiz ------------------------- */
.w-quiz-paged > .w-quiz-page { display: none; }
.w-quiz-paged > .w-quiz-page.active { display: block; }

.w-quiz-jump {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 14px 0 6px;
  justify-content: center;
}
.w-quiz-jump-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--w-card-bg-2);
  color: var(--w-text-muted);
  border: 1px solid var(--w-border);
  font-family: var(--w-mono);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  padding: 0;
}
.w-quiz-jump-btn:hover {
  color: var(--w-text);
  border-color: var(--w-primary);
}
.w-quiz-jump-btn.current {
  color: var(--w-text);
  border-color: var(--w-primary);
  background: rgba(91, 157, 255, 0.12);
}
.w-quiz-jump-btn.done {
  color: var(--w-success);
  border-color: var(--w-success);
  background: rgba(16, 185, 129, 0.1);
}
.w-quiz-jump-btn.current.done {
  background: rgba(16, 185, 129, 0.2);
  color: var(--w-text);
}

.w-quiz-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--w-border);
}
.w-quiz-page-label {
  font-family: var(--w-mono);
  font-size: 13px;
  color: var(--w-text-muted);
}
.w-quiz-footer .w-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ------------------------------ sparkles ------------------------------- */
@keyframes w-pop {
  0% { transform: scale(1); }
  40% { transform: scale(1.04); }
  100% { transform: scale(1); }
}
.w-feedback.ok { animation: w-pop 0.3s ease; }