/* ─── Algorithms section ─────────────────────────────────────────── */
.algo-tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  overflow-x: auto;
}

.algo-tab {
  padding: 10px 20px;
  font-size: .85rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color .2s, border-color .2s;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

.algo-tab:hover {
  color: var(--text);
}

.algo-tab.active {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

.algo-panel {
  display: none;
}

.algo-panel.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.algo-desc h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.algo-desc p {
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 16px;
  font-size: .92rem;
}

.algo-desc ul {
  padding-left: 20px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.9;
}

.algo-desc li::marker {
  color: var(--teal);
}

.math-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.math-header {
  background: var(--surface2);
  padding: 10px 16px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.math-lang {
  color: var(--teal);
  font-family: var(--mono);
}

.math-body {
  padding: 20px 18px;
  font-size: .88rem;
  line-height: 2.2;
  color: var(--purple);
}

.code-body {
  padding: 0;
  overflow-x: auto;
}

.code-body pre {
  padding: 18px 18px;
  font-family: var(--mono);
  font-size: .78rem;
  line-height: 1.7;
  color: #a8d8a8;
  background: transparent;
}

.kw {
  color: #ff79c6;
}

.fn {
  color: #8be9fd;
}

.str {
  color: #f1fa8c;
}

.cm {
  color: #6272a4;
}

.var {
  color: #bd93f9;
}

/* ─── Code / Codebase section ────────────────────────────────────── */
.module-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.module-row {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  align-items: center;
  gap: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 20px;
  transition: border-color .2s;
}

.module-row:hover {
  border-color: var(--teal2);
}

.module-file {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--teal);
}

.module-desc {
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.5;
}

.module-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.tag {
  background: rgba(57, 208, 240, .08);
  color: var(--teal);
  border: 1px solid rgba(57, 208, 240, .2);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: .7rem;
  font-family: var(--mono);
  white-space: nowrap;
}

.tag-purple {
  background: rgba(188, 140, 255, .08);
  color: var(--purple);
  border-color: rgba(188, 140, 255, .2);
}

.tag-orange {
  background: rgba(240, 136, 62, .08);
  color: var(--orange);
  border-color: rgba(240, 136, 62, .2);
}

.tag-green {
  background: rgba(63, 185, 80, .08);
  color: var(--green);
  border-color: rgba(63, 185, 80, .2);
}

/* ─── CLI section ────────────────────────────────────────────────── */
.terminal {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.terminal-bar {
  background: var(--surface2);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.t-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.t-red {
  background: #ff6058;
}

.t-yellow {
  background: #ffbd2e;
}

.t-green {
  background: #28c940;
}

.t-title {
  font-size: .78rem;
  color: var(--muted);
  margin-left: 8px;
  font-family: var(--mono);
}

.terminal-body {
  padding: 20px 24px;
  font-family: var(--mono);
  font-size: .82rem;
  line-height: 2;
}

.t-prompt {
  color: #3fb950;
}

.t-cmd {
  color: #e6edf3;
}

.t-out {
  color: var(--muted);
}

.t-hi {
  color: var(--teal);
}

.t-blank {
  display: block;
  margin: 4px 0;
}

/* ─── FAQ / Interview ────────────────────────────────────────────── */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.faq-q {
  padding: 18px 22px;
  font-size: .92rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: background .2s;
}

.faq-q:hover {
  background: var(--surface2);
}

.faq-q::after {
  content: '+';
  color: var(--teal);
  font-size: 1.2rem;
  transition: transform .25s;
}

.faq-item.open .faq-q::after {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease, padding .3s;
  padding: 0 22px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.8;
}

.faq-item.open .faq-a {
  max-height: 400px;
  padding: 0 22px 18px;
}

.faq-a strong {
  color: var(--text);
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .algo-panel.active { grid-template-columns: 1fr; gap: 18px; }
  .module-row { grid-template-columns: 1fr; gap: 8px; padding: 12px 14px; }
  .module-row .mod-lang { text-align: left; }
}