/* A compact practice dashboard; lesson content keeps its existing layout. */
.catalog-page .dsa-main {
  max-width: 1320px;
}
.catalog-page .lesson-head {
  margin: 30px 0 26px;
}
.catalog-page .lesson-head h1 {
  font-size: clamp(30px, 3.4vw, 44px);
  margin: 10px 0;
}
.catalog-page .lesson-head p {
  font-size: 15px;
  color: var(--muted);
}
.progress-overview {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 26px 30px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(110deg, var(--surface), var(--bg));
  margin-bottom: 38px;
}
.progress-orbit {
  width: 88px;
  height: 88px;
  flex-shrink: 0;
  border-radius: 50%;
  background: conic-gradient(var(--cyan) var(--progress), var(--line) 0);
  display: grid;
  place-items: center;
  position: relative;
}
.progress-orbit:before {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--surface);
}
.progress-orbit strong {
  position: relative;
  font: 600 25px var(--mono);
}
.progress-orbit small {
  font-size: 13px;
  color: var(--muted);
}
.progress-copy h2 {
  font-size: 27px;
  margin: 5px 0;
  letter-spacing: -0.7px;
}
.progress-copy h2 span {
  font-size: 17px;
  color: var(--muted);
  font-weight: 400;
}
.progress-copy p {
  font-size: 12px;
  color: var(--muted);
}
.continue-link {
  margin-left: auto;
  padding-left: 28px;
  border-left: 1px solid var(--line);
  max-width: 330px;
  text-decoration: none;
  color: var(--ink);
}
.continue-link small {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 7px;
}
.continue-link strong {
  font-size: 14px;
}
.continue-link strong span {
  color: var(--gold);
  margin-left: 8px;
}
.catalog-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 36px;
}
.category-nav {
  align-self: start;
  position: sticky;
  top: 104px;
}
.category-nav > .eyebrow {
  color: var(--faint);
  margin: 0 10px 14px;
}
.category-nav button {
  width: 100%;
  display: flex;
  justify-content: space-between;
  background: transparent;
  border: 1px solid transparent;
  padding: 12px 10px;
  font-size: 12px;
  margin: 2px 0;
  text-align: left;
  gap: 5px;
}
.category-nav button small {
  font: 10px var(--mono);
  color: var(--faint);
}
.category-nav button[aria-pressed="true"] {
  background: var(--surface2);
  color: var(--gold);
  border-color: var(--line);
}
.problem-library {
  min-width: 0;
}
.library-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-bottom: 24px;
}
.search-box {
  flex: 1;
  min-width: 180px;
}
.catalog-page #lesson-search {
  padding: 11px 14px;
  font-size: 13px;
  background: var(--surface);
  border-radius: 8px;
  height: 44px;
}
.status-tabs {
  display: flex;
  gap: 3px;
  border: 1px solid var(--line);
  padding: 3px;
  border-radius: 9px;
}
.status-tabs button {
  border: 0;
  background: transparent;
  font-size: 11px;
  min-height: 36px;
  padding: 8px 10px;
  color: var(--muted);
}
.status-tabs button[aria-pressed="true"] {
  background: var(--surface2);
  color: var(--ink);
  box-shadow: 0 1px 3px #0002;
}
.problem-group {
  margin-bottom: 30px;
}
.problem-group > header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 0 12px;
}
.problem-group h2 {
  font-size: 17px;
  letter-spacing: -0.3px;
}
.problem-group > header > span {
  font-size: 11px;
  color: var(--faint);
}
.problem-rows {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
}
.problem-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 76px;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  transition: background 0.2s;
}
.problem-row:last-child {
  border-bottom: 0;
}
.problem-row:hover {
  background: var(--surface2);
}
.problem-link {
  text-decoration: none;
  min-width: 0;
  color: var(--ink);
}
.problem-link strong {
  font-size: 14px;
  font-weight: 600;
  display: block;
}
.problem-link small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--muted);
  font-size: 11px;
  margin-top: 4px;
}
.row-status {
  font-size: 10px;
  color: var(--faint);
  text-align: right;
}
.completed .row-status {
  color: var(--cyan);
}
.completion-toggle {
  position: relative;
  min-height: 44px;
  flex-shrink: 0;
}
.completion-toggle svg,
.completion-toast > svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.completion-toggle svg {
  border: 1px solid var(--faint);
  border-radius: 50%;
  padding: 3px;
}
.completion-toggle[aria-pressed="false"] path {
  opacity: 0;
}
.completion-toggle[aria-pressed="true"] {
  color: var(--cyan);
}
.completion-toggle[aria-pressed="true"] svg {
  border-color: var(--cyan);
  background: color-mix(in srgb, var(--cyan) 12%, transparent);
}
.problem-row .completion-toggle {
  width: 44px;
  padding: 0;
  border: 0;
  background: transparent;
}
.problem-row .completion-toggle span {
  display: none;
}
.lesson-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin: 20px 0;
}
.lesson-progress > a {
  font-size: 12px;
  text-decoration: none;
}
.lesson-progress > a span {
  display: inline-block;
  color: var(--muted);
  margin-left: 12px;
}
.lesson-progress .completion-toggle {
  background: var(--surface);
  font-size: 12px;
}
.catalog-empty {
  padding: 50px 20px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: 12px;
}
.catalog-empty h2 {
  font-size: 20px;
}
.catalog-empty p {
  font-size: 13px;
  color: var(--muted);
  margin-top: 12px;
}
.completion-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translate(-50%, 24px) scale(0.96);
  opacity: 0;
  pointer-events: none;
  z-index: 80;
  display: flex;
  gap: 14px;
  align-items: center;
  width: max-content;
  max-width: calc(100vw - 24px);
  padding: 18px 24px;
  background: var(--surface2);
  border: 1px solid var(--cyan);
  border-radius: 14px;
  box-shadow: 0 14px 60px #0005;
  transition:
    opacity 0.25s,
    transform 0.35s cubic-bezier(0.2, 1.5, 0.5, 1);
}
.completion-toast.visible {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}
.completion-toast > svg {
  width: 32px;
  height: 32px;
  color: var(--cyan);
  flex-shrink: 0;
}
.completion-toast strong {
  display: block;
  font-size: 14px;
}
.completion-toast small {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 3px;
}
.completion-sparks {
  position: absolute;
  left: 38px;
  top: 50%;
  pointer-events: none;
}
.completion-sparks i {
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 2px;
  background: var(--gold);
  --angle: calc(var(--i) * 30deg);
  transform: rotate(var(--angle)) translateX(0);
  opacity: 0;
}
.completion-toast.visible .completion-sparks i {
  animation: completion-burst 0.8s ease-out both;
}
.completion-toast.visible > svg path {
  stroke-dasharray: 30;
  stroke-dashoffset: 30;
  animation: completion-check 0.5s ease 0.1s forwards;
}
@keyframes completion-burst {
  20% {
    opacity: 1;
  }
  100% {
    transform: rotate(var(--angle)) translateX(76px) rotate(150deg);
    opacity: 0;
  }
}
@keyframes completion-check {
  to {
    stroke-dashoffset: 0;
  }
}
@media (max-width: 1024px) {
  .catalog-layout {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 22px;
  }
  .continue-link {
    max-width: 260px;
  }
  .progress-overview {
    padding: 22px;
    gap: 18px;
  }
  .problem-row {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 8px;
    padding: 12px;
  }
  .row-status {
    display: none;
  }
  .problem-row .completion-toggle {
    width: 44px;
  }
  .catalog-page .topbar {
    position: relative;
  }
  .category-nav {
    top: 24px;
  }
}
@media (max-width: 760px) {
  .catalog-layout {
    display: block;
  }
  .category-nav {
    position: static;
    display: flex;
    overflow-x: auto;
    gap: 6px;
    margin-bottom: 20px;
    padding-bottom: 8px;
  }
  .category-nav > .eyebrow {
    display: none;
  }
  .category-nav button {
    width: auto;
    flex-shrink: 0;
    gap: 12px;
    padding: 10px;
    font-size: 11px;
    min-height: 44px;
  }
  .progress-overview {
    flex-wrap: wrap;
    padding: 20px;
    gap: 16px;
    margin-bottom: 24px;
  }
  .progress-orbit {
    width: 70px;
    height: 70px;
  }
  .progress-copy {
    flex: 1;
    min-width: 140px;
  }
  .progress-copy h2 {
    font-size: 23px;
  }
  .progress-copy h2 span {
    font-size: 13px;
  }
  .continue-link {
    margin: 0;
    max-width: none;
    width: 100%;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 14px 0 0;
  }
  .problem-link strong {
    font-size: 13px;
  }
  .problem-link small {
    font-size: 10px;
  }
  .problem-group h2 {
    font-size: 16px;
  }
  .library-tools {
    gap: 10px;
  }
  .search-box {
    flex-basis: 100%;
  }
  .status-tabs {
    width: 100%;
  }
  .status-tabs button {
    flex: 1;
  }
  .catalog-page .lesson-head h1 {
    font-size: 30px;
  }
  .catalog-page .lesson-head {
    margin: 24px 0;
  }
  .completion-toast {
    padding: 15px;
  }
  .completion-toast small {
    overflow-wrap: anywhere;
  }
  .lesson-progress > a span {
    margin-left: 5px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .completion-toast,
  .problem-row {
    transition: none;
  }
  .completion-toast.visible .completion-sparks i {
    animation: none;
  }
  .completion-toast.visible > svg path {
    animation: none;
    stroke-dashoffset: 0;
  }
}