/* ============================================================
   Interactive Practice Blocks
   ============================================================ */

/* ── Container — matches .md-typeset .highlight ────────────── */
.practice-block {
  border: 1px solid #dde0e3;
  border-radius: 0;
  margin: 1em 0;
  position: relative;
}

[data-md-color-scheme="slate"] .practice-block {
  border-color: #2e2e2e;
}

/* ── Title bar (injected by JS) ────────────────────────────── */
.practice-title-bar {
  height: 1.7rem;
  line-height: 1.7rem;
  padding-left: 12px;
  font-size: 0.6rem;
  letter-spacing: 0.08rem;
  color: #b4b8be;
  background-color: #e8eaed;
  border-bottom: 1px solid #dde0e3;
}

.practice-title-bar::before {
  content: '● ● ●';
}

/* Copy-to-clipboard button — hidden until the block is unlocked */
.practice-copy {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  appearance: none;
  background: transparent;
  border: 1px solid rgba(128, 128, 128, 0.35);
  border-radius: 3px;
  color: inherit;
  font-family: var(--md-text-font-family, Inter, sans-serif);
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.1em 0.55em;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s, color 0.15s, border-color 0.15s, background-color 0.15s;
}

.practice-block--unlocked .practice-copy {
  opacity: 1;
  pointer-events: auto;
}

.practice-copy:hover {
  border-color: var(--md-primary-fg-color);
  color: var(--md-primary-fg-color);
}

.practice-copy--ok {
  border-color: #4caf50 !important;
  color: #4caf50 !important;
}

.practice-copy--err {
  border-color: #c14a4a !important;
  color: #c14a4a !important;
}

.practice-title-bar {
  position: relative;
}

[data-md-color-scheme="slate"] .practice-title-bar {
  background-color: #1a1a1a;
  border-bottom-color: #2e2e2e;
  color: #484848;
}

/* ── Code area — matches .md-typeset .highlight pre > code ─── */
.practice-code {
  background-color: #f5f6f7;
  direction: ltr;
  font-family: var(--md-code-font-family, 'JetBrains Mono', monospace);
  font-size: .85em;
  font-variant-ligatures: none;
  line-height: 1.4;
  margin: 0;
  overflow: auto;
  padding: 0.7720588235em 1.1764705882em;
  color: var(--md-code-fg-color);
}

[data-md-color-scheme="slate"] .practice-code {
  background-color: #141414;
}

/* Each line in the command — pre-wrap preserves indentation spaces */
.pc-line {
  display: block;
  white-space: pre;
  line-height: 1.7;
  margin: 0;
}

/* Fixed (non-blank) parts */
.pc-fixed {
  color: var(--md-code-fg-color);
}

/* Syntax token colors — match Material theme Pygments classes */
.practice-code .se { color: var(--md-code-hl-special-color); } /* backslash continuation */
.practice-code .m  { color: var(--md-code-hl-number-color);  } /* numeric literals */

/* ── Inline inputs (replace .pc-blank on init) ─────────────── */
.practice-block input.pc-input {
  font-family: inherit;
  font-size: inherit;
  line-height: 1.15;
  background: rgba(76, 175, 80, 0.08);
  border: 1px dashed #4caf50;
  border-radius: 3px;
  color: #4caf50;
  padding: 0 .35em;
  vertical-align: baseline;
  outline: none;
  transition: border-color .2s, background .2s;
}

.practice-block input.pc-input::placeholder {
  color: #4caf50;
  opacity: 0.55;
}

.practice-block input.pc-input:focus {
  border-style: solid;
  background: rgba(76, 175, 80, 0.14);
}

/* ── Per-blank feedback states ─────────────────────────────── */
.practice-block input.pc-input--correct {
  border-color: #43a047;
  border-style: solid;
  background: rgba(67, 160, 71, 0.13);
  color: #43a047;
}

.practice-block input.pc-input--wrong {
  border-color: #e53935;
  border-style: solid;
  background: rgba(229, 57, 53, 0.1);
  color: #e53935;
  animation: practice-shake .35s ease;
}

@keyframes practice-shake {
  0%,  100% { transform: translateX(0); }
  20%        { transform: translateX(-4px); }
  40%        { transform: translateX(4px); }
  60%        { transform: translateX(-3px); }
  80%        { transform: translateX(3px); }
}

/* Inline contextual feedback text after a wrong input */
.pc-feedback {
  font-family: var(--md-text-font-family, Inter, sans-serif);
  font-size: .72em;
  color: #e53935;
  margin-left: .4em;
  opacity: 0;
  transition: opacity .2s;
  white-space: normal;
}

.pc-feedback--visible {
  opacity: 1;
}

/* ── Footer ────────────────────────────────────────────────── */
.practice-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .45em 1.1764705882em;
  border-top: 1px solid #dde0e3;
  background-color: #f5f6f7;
}

[data-md-color-scheme="slate"] .practice-footer {
  border-top-color: #2e2e2e;
  background-color: #141414;
}

.practice-footer-actions {
  display: flex;
  gap: .5em;
}

.pf-toggle {
  font-family: var(--md-text-font-family, Inter, sans-serif);
  font-size: .72em;
  background: none;
  border: 1px solid rgba(128, 128, 128, 0.3);
  border-radius: 3px;
  color: var(--md-default-fg-color--light, #666);
  cursor: pointer;
  padding: .2em .55em;
  transition: border-color .15s, color .15s;
}

.pf-toggle:hover,
.pf-toggle--active {
  border-color: var(--md-primary-fg-color);
  color: var(--md-primary-fg-color);
}

.pf-solve {
  font-family: var(--md-text-font-family, Inter, sans-serif);
  font-size: .72em;
  background: none;
  border: 1px solid rgba(128, 128, 128, 0.3);
  border-radius: 3px;
  color: var(--md-default-fg-color--light, #666);
  cursor: pointer;
  padding: .2em .55em;
  opacity: 0.35;
  transition: opacity .15s, border-color .15s, color .15s;
}

.pf-solve:hover {
  opacity: 1;
  border-color: var(--md-primary-fg-color);
  color: var(--md-primary-fg-color);
}

[data-md-color-scheme="slate"] .pf-solve {
  color: rgba(255, 255, 255, 0.45);
  border-color: rgba(255, 255, 255, 0.2);
}

.practice-check {
  font-family: var(--md-text-font-family, Inter, sans-serif);
  font-size: .72em;
  font-weight: 600;
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid #4caf50;
  border-radius: 3px;
  color: #4caf50;
  cursor: pointer;
  padding: .2em .8em;
  transition: background .15s;
}

.practice-check:hover {
  background: rgba(76, 175, 80, 0.22);
}

/* ── Hint / Params panels ──────────────────────────────────── */
.practice-panel {
  display: none;
  padding: .7em 1.1764705882em;
  font-family: var(--md-text-font-family, Inter, sans-serif);
  font-size: .8em;
  line-height: 1.65;
  color: var(--md-default-fg-color--light, #555);
  background-color: #f5f6f7;
  border-top: 1px solid #dde0e3;
}

[data-md-color-scheme="slate"] .practice-panel {
  background-color: #141414;
  border-top-color: #2e2e2e;
}

.practice-panel--visible {
  display: block;
}

.practice-panel code {
  font-family: var(--md-code-font-family, 'JetBrains Mono', monospace);
  font-size: .88em;
  background: var(--md-code-bg-color);
  padding: .1em .3em;
  border-radius: 2px;
}

/* ── Unlocked state ────────────────────────────────────────── */
.practice-block--unlocked .practice-footer {
  display: none;
}

.practice-block--unlocked .practice-panel {
  display: none !important;
}

/* Static value span shown after unlock (replaces input) */
.pc-value {
  color: var(--md-code-fg-color);
}

/* Green flash on unlock */
@keyframes practice-unlock-flash {
  0%   { background: rgba(67, 160, 71, 0.2); }
  100% { background: transparent; }
}

.practice-block--unlocking {
  animation: practice-unlock-flash .7s ease forwards;
}

/* ── Dark mode — input and toggle adjustments ──────────────── */
[data-md-color-scheme="slate"] .practice-block input.pc-input {
  background: rgba(76, 175, 80, 0.12);
}

[data-md-color-scheme="slate"] .pf-toggle {
  color: rgba(255, 255, 255, 0.45);
  border-color: rgba(255, 255, 255, 0.2);
}