:root {
  --ink: #eef7f7;
  --muted: #9fb8ba;
  --panel: #11282c;
  --panel-2: #173238;
  --line: #315258;
  --teal: #54d6c6;
  --teal-strong: #7ce8dc;
  --amber: #f0c067;
  --red: #ff8177;
  --bg: #071619;
  --shadow: 0 18px 60px rgba(0, 0, 0, .34);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(41, 132, 132, .22), transparent 30rem),
    linear-gradient(145deg, #061315 0%, #091b1f 52%, #061214 100%);
  font-family: "Noto Sans JP", "Yu Gothic", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
  line-height: 1.65;
}

button { font: inherit; }

.commerce-bar {
  position: sticky;
  z-index: 50;
  top: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  min-height: 58px;
  padding: 8px max(16px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  background: rgba(4, 16, 19, .92);
  backdrop-filter: blur(16px);
}

.commerce-home,
.commerce-account,
.commerce-upgrade {
  color: var(--ink);
  text-decoration: none;
  font-size: .84rem;
  font-weight: 800;
}

.commerce-home { justify-self: start; color: var(--muted); }
.commerce-home:hover,
.commerce-account:hover { color: white; }

.commerce-plan {
  display: grid;
  text-align: center;
  line-height: 1.25;
}

.commerce-plan strong { font-size: .84rem; color: var(--teal-strong); }
.commerce-plan span { margin-top: 2px; color: var(--muted); font-size: .7rem; }

.commerce-actions {
  display: flex;
  justify-self: end;
  align-items: center;
  gap: 8px;
}

.commerce-account,
.commerce-upgrade {
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.commerce-upgrade {
  border-color: rgba(240, 192, 103, .52);
  color: #251b07;
  background: var(--amber);
}

.commerce-upgrade[hidden] { display: none; }

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(124, 232, 220, .6);
  border-radius: 15px;
  color: #071619;
  background: linear-gradient(140deg, #8af2e6, #48bfb4);
  box-shadow: 0 9px 24px rgba(57, 202, 186, .2);
  font-weight: 900;
  letter-spacing: -.08em;
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.15rem, 2.3vw, 1.55rem);
  line-height: 1.25;
  letter-spacing: .02em;
}

.brand p,
.eyebrow,
.progress-label,
.image-caption,
.source-note,
.footer-note {
  margin: 0;
  color: var(--muted);
  font-size: .82rem;
}

.progress-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 180px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(17, 40, 44, .78);
}

.progress-track {
  flex: 1;
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: #284348;
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--amber));
  transition: width .35s ease;
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 9px;
  margin-bottom: 18px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(10, 29, 33, .88);
}

.mode-tab {
  min-height: 54px;
  border: 0;
  border-radius: 12px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-weight: 800;
  transition: color .2s ease, background .2s ease, transform .2s ease;
}

.mode-tab span,
.mode-tab small {
  display: block;
}

.mode-tab span {
  font-size: 1rem;
  line-height: 1.25;
}

.mode-tab small {
  margin-top: 2px;
  color: #719397;
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .05em;
}

.mode-tab:hover { color: var(--ink); }

.mode-tab[aria-selected="true"] {
  color: #052023;
  background: var(--teal-strong);
  box-shadow: 0 8px 20px rgba(59, 206, 190, .18);
}

.mode-tab[aria-selected="true"] small { color: #285b5e; }

.mode-tab:active { transform: scale(.985); }

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.26fr) minmax(320px, .74fr);
  gap: 18px;
}

.viewer-card,
.study-card,
.quiz-card,
.quick-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(160deg, rgba(22, 50, 56, .98), rgba(12, 31, 35, .98));
  box-shadow: var(--shadow);
}

.viewer-card { overflow: hidden; }

.viewer-head,
.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px 16px;
}

.viewer-head h2,
.card-head h2,
.quiz-card h2,
.quick-card h2 {
  margin: 3px 0 0;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.35;
}

.tag {
  flex: 0 0 auto;
  padding: 6px 10px;
  border: 1px solid rgba(84, 214, 198, .42);
  border-radius: 999px;
  color: var(--teal-strong);
  background: rgba(34, 102, 100, .24);
  font-size: .78rem;
  font-weight: 800;
}

.image-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 480px;
  padding: 22px;
  overflow: hidden;
  background:
    linear-gradient(rgba(88, 137, 141, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 137, 141, .06) 1px, transparent 1px),
    #020708;
  background-size: 24px 24px;
}

.image-stage::before {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(142, 196, 198, .16);
  border-radius: 13px;
  pointer-events: none;
}

.viewer-watermark {
  position: absolute;
  z-index: 4;
  right: 12px;
  bottom: 10px;
  max-width: calc(100% - 24px);
  padding: 4px 8px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 7px;
  color: rgba(255, 255, 255, .48);
  background: rgba(0, 0, 0, .44);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .65rem;
  letter-spacing: .08em;
  pointer-events: none;
  user-select: none;
}

.image-canvas {
  position: relative;
  z-index: 1;
  display: grid;
  width: 100%;
  max-width: var(--image-max-width, 780px);
  aspect-ratio: var(--image-ratio, 1);
  place-items: center;
  transform-origin: center;
  transition: transform .18s ease;
}

.case-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: grayscale(1) contrast(1.04);
  transition: filter .18s ease;
}

.image-error {
  position: relative;
  z-index: 2;
  max-width: 360px;
  margin: 0;
  padding: 18px;
  border: 1px solid rgba(255, 129, 119, .5);
  border-radius: 13px;
  color: #ffd8d4;
  text-align: center;
  background: rgba(78, 24, 24, .48);
}

.annotation-layer {
  position: absolute;
  z-index: 2;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease;
}

.image-stage.is-revealed .annotation-layer { opacity: 1; }

.annotation-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.annotation-line {
  stroke: #ff3d32;
  stroke-width: 4;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 1px 2px #000) drop-shadow(0 0 5px rgba(255, 61, 50, .75));
}

.annotation-target {
  fill: rgba(255, 61, 50, .18);
  stroke: #ff6259;
  stroke-width: 3;
  vector-effect: non-scaling-stroke;
  transform-box: fill-box;
  transform-origin: center;
  animation: target-pulse 1.35s ease-in-out infinite;
}

.annotation-label {
  position: absolute;
  left: calc(var(--label-x) * 1%);
  top: calc(var(--label-y) * 1%);
  max-width: min(46%, 190px);
  padding: 6px 9px;
  border: 1px solid rgba(255, 129, 119, .92);
  border-radius: 8px;
  color: #fff;
  background: rgba(126, 22, 20, .92);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .5);
  font-size: clamp(.72rem, 1.8vw, .88rem);
  font-weight: 900;
  line-height: 1.35;
  text-shadow: 0 1px 2px #000;
}

@keyframes target-pulse {
  0%, 100% { opacity: .72; transform: scale(.82); }
  50% { opacity: 1; transform: scale(1.16); }
}

.viewer-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 20px 20px;
}

.image-adjust {
  margin: 0;
}

.image-adjust summary {
  display: none;
}

.image-tools {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding: 0 20px 18px;
}

.image-tools label {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: .82rem;
}

.image-tools input {
  width: 100%;
  accent-color: var(--teal);
  cursor: pointer;
}

.image-caption {
  padding: 0 20px 18px;
}

.image-caption a { color: #9aece4; }

.primary-btn,
.secondary-btn,
.choice-btn,
.next-btn {
  min-height: 46px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 800;
}

.primary-btn,
.next-btn {
  border: 0;
  color: #062023;
  background: var(--teal-strong);
}

.primary-btn { padding: 0 18px; }

.secondary-btn {
  padding: 0 16px;
  border: 1px solid var(--line);
  color: var(--ink);
  background: #1a373c;
}

.control-hint {
  align-self: center;
  margin-left: auto;
  color: var(--muted);
  font-size: .82rem;
}

.side-stack {
  display: grid;
  align-content: start;
  gap: 18px;
}

.study-card { padding-bottom: 20px; }

.reading-guide {
  margin: 0 22px 14px;
  padding: 13px 14px;
  border: 1px solid rgba(73, 194, 182, .34);
  border-radius: 12px;
  background: rgba(40, 127, 120, .1);
}

.reading-guide strong {
  color: var(--teal-strong);
  font-size: .84rem;
}

.reading-guide p {
  margin: 5px 0 0;
  color: var(--ink);
  font-size: .88rem;
  line-height: 1.65;
}

.check-list {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0 22px;
  list-style: none;
}

.check-list li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 12px;
  align-items: start;
  padding: 12px;
  border: 1px solid rgba(79, 113, 118, .52);
  border-radius: 13px;
  background: rgba(7, 22, 25, .42);
}

.step-number {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  color: #062023;
  background: var(--teal);
  font-weight: 900;
}

.check-list strong { display: block; }

.check-list span:not(.step-number) {
  color: var(--muted);
  font-size: .88rem;
}

.finding-box {
  margin: 16px 22px 0;
  padding: 15px;
  border-left: 3px solid var(--amber);
  border-radius: 0 12px 12px 0;
  background: rgba(240, 192, 103, .09);
}

.finding-box strong { color: #f7d797; }

.finding-box p { margin: 5px 0 0; }

.finding-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 10px;
  align-items: center;
}

.finding-heading span {
  padding: 3px 7px;
  border: 1px solid rgba(255, 129, 119, .45);
  border-radius: 999px;
  color: #ffd8d4;
  background: rgba(126, 22, 20, .28);
  font-size: .68rem;
  font-weight: 800;
}

.finding-box .annotation-basis {
  margin-top: 9px;
  padding-top: 8px;
  border-top: 1px solid rgba(240, 192, 103, .22);
  color: var(--muted);
  font-size: .75rem;
  line-height: 1.5;
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 16px 22px 0;
}

.lesson-nav button {
  border: 0;
  color: var(--teal-strong);
  background: transparent;
  cursor: pointer;
  font-weight: 800;
}

.lesson-nav button:disabled {
  color: #557075;
  cursor: not-allowed;
}

.lower-grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 18px;
  margin-top: 18px;
}

.quiz-card,
.quick-card { padding: 22px; }

.quiz-question {
  margin: 10px 0 16px;
  font-size: 1.05rem;
  font-weight: 700;
}

.choices {
  display: grid;
  gap: 10px;
}

.choice-btn {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--line);
  color: var(--ink);
  text-align: left;
  background: rgba(7, 21, 24, .55);
}

.choice-btn:hover { border-color: var(--teal); }

.choice-btn.correct {
  border-color: var(--teal);
  color: #bff9f1;
  background: rgba(41, 151, 139, .22);
}

.choice-btn.wrong {
  border-color: var(--red);
  color: #ffd2ce;
  background: rgba(174, 67, 59, .18);
}

.quiz-feedback {
  display: none;
  margin-top: 14px;
  padding: 14px;
  border-radius: 12px;
  background: #0b2024;
}

.quiz-feedback.is-visible { display: block; }
.quiz-feedback strong { color: var(--teal-strong); }
.quiz-feedback p { margin: 4px 0 0; color: var(--muted); }

.next-btn {
  width: 100%;
  margin-top: 12px;
  padding: 10px 16px;
}

.compare-list {
  display: grid;
  gap: 12px;
  margin: 14px 0 0;
}

.compare-item {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border: 1px solid rgba(76, 111, 116, .48);
  border-radius: 13px;
  background: rgba(8, 24, 27, .5);
}

.compare-item strong { color: var(--teal-strong); }
.compare-item p { margin: 0; color: var(--muted); font-size: .87rem; }

.clinical-flow {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.clinical-flow > div {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 11px;
  align-items: start;
}

.clinical-flow span {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(84, 214, 198, .45);
  border-radius: 50%;
  color: var(--teal-strong);
  font-weight: 900;
}

.clinical-flow p { margin: 1px 0 0; color: var(--muted); font-size: .87rem; }
.clinical-flow strong { color: var(--ink); }

.source-note {
  margin-top: 17px;
  line-height: 1.7;
}

.source-note a { color: #9aece4; }

.footer-note {
  max-width: 920px;
  margin: 22px auto 0;
  text-align: center;
}

.footer-note a {
  color: #9aece4;
  text-underline-offset: 3px;
}

@media (max-width: 900px) {
  .workspace,
  .lower-grid { grid-template-columns: 1fr; }
  .mode-tabs { grid-template-columns: repeat(3, 1fr); }
  .image-stage { min-height: 400px; }
}

@media (max-width: 620px) {
  body {
    padding-bottom: env(safe-area-inset-bottom);
  }

  .shell {
    width: 100%;
    padding: max(12px, env(safe-area-inset-top)) 10px 36px;
  }

  .commerce-bar {
    grid-template-columns: auto 1fr auto;
    gap: 8px;
    min-height: 54px;
    padding: 7px 10px;
  }

  .commerce-plan { text-align: left; }
  .commerce-plan span { display: none; }
  .commerce-account { display: none; }
  .commerce-upgrade { min-height: 36px; padding-inline: 10px; }

  .topbar {
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 12px;
    padding-inline: 3px;
  }

  .brand { gap: 9px; }
  .brand-mark { width: 42px; height: 42px; border-radius: 13px; }
  .brand h1 { font-size: 1.05rem; }
  .brand p { display: none; }

  .progress-pill {
    min-width: 118px;
    padding: 7px 9px;
  }

  .progress-label { font-size: .78rem; }

  .mode-tabs {
    position: sticky;
    top: max(4px, env(safe-area-inset-top));
    z-index: 10;
    display: flex;
    gap: 7px;
    margin: 0 -2px 12px;
    padding: 6px;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-padding-inline: 8px;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .mode-tabs::-webkit-scrollbar { display: none; }

  .mode-tab {
    flex: 0 0 82px;
    min-height: 50px;
    padding: 5px 8px;
    scroll-snap-align: center;
  }

  .mode-tab span { font-size: .95rem; }

  .viewer-card,
  .study-card,
  .quiz-card,
  .quick-card { border-radius: 17px; }

  .viewer-head,
  .card-head { padding: 17px 17px 13px; }

  .viewer-head h2 { font-size: 1.12rem; }
  .tag { padding: 5px 8px; font-size: .75rem; }

  .image-stage {
    min-height: 340px;
    padding: 10px;
    touch-action: pan-y;
  }

  .image-stage::before { inset: 8px; }
  .image-canvas { max-width: 100%; }
  .annotation-label { padding: 5px 7px; font-size: .76rem; }
  .annotation-line { stroke-width: 5; }

  .viewer-controls {
    display: grid;
    grid-template-columns: 1fr;
    gap: 9px;
    padding: 12px 15px 14px;
  }

  .primary-btn {
    grid-column: 1 / -1;
    width: 100%;
    min-height: 56px;
    font-size: 1rem;
  }

  .secondary-btn { width: 100%; min-height: 48px; }

  .control-hint {
    grid-column: 1 / -1;
    width: 100%;
    margin-left: 0;
    font-size: .86rem;
    line-height: 1.55;
  }

  .image-adjust {
    border-top: 1px solid rgba(49, 82, 88, .72);
  }

  .image-adjust summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    min-height: 50px;
    padding: 0 15px;
    color: var(--teal-strong);
    cursor: pointer;
    font-size: .9rem;
    font-weight: 900;
    list-style: none;
  }

  .image-adjust summary::-webkit-details-marker { display: none; }

  .image-adjust summary small {
    margin-left: auto;
    color: var(--muted);
    font-size: .75rem;
    font-weight: 700;
  }

  .image-adjust summary::after {
    content: "＋";
    color: var(--amber);
    font-size: 1.2rem;
  }

  .image-adjust[open] summary::after { content: "−"; }

  .image-tools {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 0 15px 14px;
  }

  .image-tools label {
    min-height: 40px;
    font-size: .88rem;
  }

  .image-caption {
    padding: 12px 15px 15px;
    font-size: .78rem;
    line-height: 1.55;
  }

  .check-list { padding: 0 17px; }
  .check-list li { padding: 11px; }
  .reading-guide { margin-inline: 17px; }
  .finding-box { margin-inline: 17px; }
  .lesson-nav { padding-inline: 17px; }
  .quiz-card,
  .quick-card { padding: 18px; }
  .choice-btn { min-height: 52px; }
  .footer-note { padding-inline: 8px; font-size: .78rem; }
}

@media (max-width: 390px) {
  .brand-mark { width: 38px; height: 38px; }
  .brand h1 { font-size: .98rem; }
  .progress-pill { min-width: 108px; }
  .mode-tab { flex-basis: 78px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
  .annotation-target { animation: none !important; }
}

.header-metrics {
  display: flex;
  align-items: stretch;
  gap: 9px;
}

.library-pill {
  display: grid;
  align-content: center;
  min-width: 150px;
  padding: 8px 13px;
  border: 1px solid rgba(240, 192, 103, .42);
  border-radius: 14px;
  background: rgba(72, 55, 24, .25);
}

.library-pill span {
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.2;
}

.library-pill strong {
  color: #f7d797;
  font-size: .88rem;
  line-height: 1.45;
}

.case-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 14px;
  align-items: center;
  margin-bottom: 18px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(150deg, rgba(18, 47, 52, .94), rgba(9, 27, 31, .94));
  box-shadow: 0 12px 34px rgba(0, 0, 0, .2);
}

.modality-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.modality-tab {
  min-height: 56px;
  padding: 7px 12px;
  border: 1px solid rgba(73, 115, 121, .7);
  border-radius: 12px;
  color: var(--ink);
  background: rgba(5, 21, 24, .52);
  cursor: pointer;
  text-align: left;
}

.modality-tab span,
.modality-tab small { display: block; }

.modality-tab span {
  font-size: 1rem;
  font-weight: 900;
  line-height: 1.25;
}

.modality-tab small {
  margin-top: 2px;
  color: var(--muted);
  font-size: .72rem;
  font-weight: 700;
}

.modality-tab[aria-selected="true"] {
  border-color: var(--teal);
  color: #052023;
  background: var(--teal-strong);
  box-shadow: 0 8px 20px rgba(59, 206, 190, .16);
}

.modality-tab[aria-selected="true"] small { color: #285b5e; }

.case-navigation {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.case-navigation strong {
  min-width: 90px;
  color: var(--ink);
  text-align: center;
  font-size: .88rem;
}

.icon-btn,
.random-btn {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--ink);
  background: #19373c;
  cursor: pointer;
  font-weight: 900;
}

.icon-btn {
  width: 44px;
  padding: 0;
  font-size: 1.45rem;
}

.random-btn {
  padding: 0 14px;
  border-color: rgba(240, 192, 103, .5);
  color: #f7d797;
  background: rgba(76, 57, 23, .42);
}

.case-picker-wrap {
  display: grid;
  grid-template-columns: auto minmax(150px, 230px);
  gap: 7px;
  align-items: center;
  color: var(--muted);
  font-size: .72rem;
  font-weight: 800;
}

.case-picker-wrap select {
  min-width: 0;
  min-height: 44px;
  padding: 0 34px 0 10px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--ink);
  background: #102a2f;
  font: inherit;
  font-size: .78rem;
}

.icon-btn:disabled {
  opacity: .38;
  cursor: not-allowed;
}

.region-status {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: .8rem;
}

.viewer-badges {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 7px;
}

.case-sequence {
  padding: 6px 10px;
  border: 1px solid rgba(240, 192, 103, .42);
  border-radius: 999px;
  color: #f7d797;
  background: rgba(83, 60, 22, .24);
  font-size: .76rem;
  font-weight: 800;
}

@media (max-width: 760px) {
  .header-metrics {
    flex-direction: column;
    gap: 6px;
  }

  .library-pill {
    min-width: 118px;
    padding: 6px 9px;
  }

  .library-pill span { display: none; }
  .library-pill strong { font-size: .78rem; }

  .case-toolbar {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 12px;
    padding: 10px;
    border-radius: 15px;
  }

  .case-navigation { justify-content: stretch; }
  .case-navigation strong { flex: 1; }
  .random-btn { margin-left: auto; }
  .case-picker-wrap {
    grid-template-columns: auto minmax(0, 1fr);
    width: 100%;
  }
  .case-picker-wrap select { width: 100%; }
  .region-status { grid-column: 1; }
}

@media (max-width: 620px) {
  .modality-tab {
    min-height: 58px;
    padding: 7px 9px;
  }

  .modality-tab span { font-size: .95rem; }
  .modality-tab small { font-size: .67rem; line-height: 1.3; }
  .random-btn { padding-inline: 10px; font-size: .8rem; }
  .viewer-head { align-items: flex-start; }
  .viewer-badges { flex-direction: column; align-items: flex-end; }
  .case-sequence, .tag { white-space: nowrap; }
}

@media (max-width: 390px) {
  .library-pill { min-width: 108px; }
  .case-navigation { gap: 5px; }
  .icon-btn { width: 40px; min-height: 42px; }
  .case-navigation strong { min-width: 74px; font-size: .8rem; }
  .random-btn { min-height: 42px; padding-inline: 8px; }
  .case-sequence { padding: 5px 7px; font-size: .7rem; }
}