:root {
  color-scheme: light;
  --bg: #f6f5f1;
  --panel: #ffffff;
  --ink: #1b1b1b;
  --muted: #68645d;
  --soft: #e7e2d8;
  --line: #ddd7ca;
  --accent: #b42121;
  --accent-soft: #f2dddd;
  --olive: #6b7358;
  --shadow: 0 18px 50px rgba(32, 28, 20, 0.08);
  --radius: 8px;
  --font-text: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(180, 33, 33, 0.05), transparent 32%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 14px;
  line-height: 1.45;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: 276px minmax(0, 1fr);
  min-height: 100vh;
}

.chapter-rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 22px 18px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(18px);
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.brand strong {
  display: block;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0;
}

.brand small {
  display: block;
  margin-top: 1px;
  color: var(--muted);
  font-size: 11px;
}

.rail-section {
  margin-top: 34px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chapter-nav {
  display: grid;
  gap: 6px;
}

.chapter-tab {
  width: 100%;
  padding: 10px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  text-align: left;
}

.chapter-tab:hover,
.chapter-tab.active {
  border-color: var(--line);
  background: var(--panel);
  color: var(--ink);
}

.chapter-tab strong {
  display: block;
  color: inherit;
  font-size: 13px;
  font-weight: 650;
}

.chapter-tab span {
  display: block;
  margin-top: 3px;
  font-size: 11px;
}

.reader {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 58px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(246, 245, 241, 0.82);
  backdrop-filter: blur(18px);
}

.ghost-button,
.nav-button,
.document-card,
.chapter-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
}

.ghost-button,
.nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  font-size: 12px;
  font-weight: 650;
}

.ghost-button:hover,
.nav-button:hover {
  border-color: #c9c0b1;
  background: #fbfaf7;
}

.topbar-status {
  color: var(--muted);
  font-size: 12px;
}

.view {
  max-width: 1160px;
  margin: 0 auto;
  padding: 42px 28px 68px;
}

.hidden {
  display: none;
}

.hero {
  display: grid;
  gap: 12px;
  max-width: 760px;
  margin-bottom: 30px;
}

.kicker {
  margin: 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  letter-spacing: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 0.98;
}

.hero p,
.chapter-intro {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
  max-width: 68ch;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

.home-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.feature-card {
  display: grid;
  gap: 10px;
  width: 100%;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(252, 250, 244, 0.95));
  color: var(--ink);
  text-align: left;
  box-shadow: var(--shadow);
}

.feature-card:hover {
  border-color: #c9c0b1;
  transform: translateY(-1px);
}

.feature-card h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.08;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.cta-line {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

.flashcards-shell {
  display: grid;
  gap: 18px;
}

.flashcards-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: end;
}

.flashcards-tools,
.flashcards-actions {
  display: flex;
  gap: 8px;
}

.flashcards-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.flashcards-stats .note-box p {
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
}

.flashcards-progress {
  overflow: hidden;
  height: 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
}

.flashcards-progress-bar {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #c44835, #d49d35);
  transition: width 220ms ease;
}

.flashcard-stage {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr) 100px;
  gap: 16px;
  align-items: center;
  perspective: 1200px;
}

.swipe-hint {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.swipe-hint-left {
  text-align: right;
}

.flashcard {
  position: relative;
  min-height: 380px;
  padding: 0;
  border: 0;
  background: transparent;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform 180ms ease;
  will-change: transform;
  touch-action: pan-y;
}

.flashcard:hover .flashcard-face {
  box-shadow: 0 20px 40px rgba(32, 28, 20, 0.12);
}

.flashcard::before {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: 28px;
  background:
    radial-gradient(circle at top, rgba(180, 33, 33, 0.08), transparent 55%),
    radial-gradient(circle at bottom, rgba(107, 115, 88, 0.09), transparent 58%);
  z-index: 0;
}

.flashcard[data-swipe-direction="left"]::before {
  background:
    radial-gradient(circle at left, rgba(180, 33, 33, 0.16), transparent 52%),
    radial-gradient(circle at bottom, rgba(180, 33, 33, 0.08), transparent 58%);
}

.flashcard[data-swipe-direction="right"]::before {
  background:
    radial-gradient(circle at right, rgba(95, 144, 92, 0.18), transparent 52%),
    radial-gradient(circle at bottom, rgba(107, 115, 88, 0.1), transparent 58%);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  align-content: center;
  gap: 12px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 243, 236, 0.98));
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow 180ms ease;
}

.flashcard-front {
  transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
}

.flashcard-back {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
}

.flashcard.is-flipped {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
}

.flashcard-label {
  margin: 0;
  color: var(--olive);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.flashcard h2 {
  margin: 0;
  font-size: clamp(28px, 5vw, 50px);
  line-height: 1;
}

.flashcard-meta {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.flashcard-click-hint {
  margin: auto 0 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.flashcards-nope {
  background: #fff5f3;
}

.flashcards-know {
  background: #f6fbf2;
}

.swipe-out-left {
  animation: swipeOutLeft 180ms ease forwards;
}

.swipe-out-right {
  animation: swipeOutRight 180ms ease forwards;
}

.flashcards-finished {
  display: grid;
  gap: 14px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.flashcards-finished h2,
.flashcards-finished p {
  margin: 0;
}

.chapter-card {
  min-height: 190px;
  padding: 18px;
  text-align: left;
  box-shadow: var(--shadow);
}

.chapter-card:hover {
  transform: translateY(-1px);
}

.chapter-number {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
}

.chapter-card h2 {
  margin: 18px 0 10px;
  font-size: 20px;
  line-height: 1.1;
}

.chapter-card p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfaf7;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
}

.chapter-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: end;
  margin-bottom: 24px;
}

.chapter-title {
  margin-bottom: 8px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
}

.chapter-tools {
  display: flex;
  gap: 8px;
}

.study-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}

.document-list {
  display: grid;
  gap: 10px;
}

.document-card {
  display: grid;
  gap: 9px;
  width: 100%;
  padding: 15px;
  text-align: left;
}

.document-card:hover,
.document-card.active {
  border-color: #c9c0b1;
  background: #fffdf9;
}

.document-card h3 {
  margin: 0;
  font-size: 15px;
  line-height: 1.18;
}

.document-card p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.side-notes {
  display: grid;
  gap: 12px;
  position: sticky;
  top: 76px;
}

.note-box {
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.74);
}

.note-box h3 {
  margin-bottom: 9px;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--olive);
}

.note-box p,
.note-box li {
  color: var(--muted);
  font-size: 12px;
}

.note-box ul {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-left: 16px;
}

.reader-grid {
  display: grid;
  max-width: 980px;
  margin: 0 auto;
}

.reader-panel {
  min-width: 0;
}

.crumb {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 12px;
}

.doc-title {
  margin-bottom: 22px;
  font-size: clamp(29px, 4vw, 48px);
  line-height: 1;
}

.analysis-card {
  margin-top: 18px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.analysis-card h2 {
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--accent);
  text-transform: uppercase;
}

.analysis-card p {
  margin-bottom: 10px;
  color: #302d29;
  font-size: 15px;
}

.analysis-card p:last-child {
  margin-bottom: 0;
}

.analysis-head,
.vocab-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.segmented {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fbfaf7;
}

.segmented button,
.mini-toggle {
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
}

.segmented button {
  min-width: 34px;
  min-height: 25px;
}

.segmented button.active {
  background: var(--ink);
  color: #fff;
}

.mini-toggle {
  min-height: 28px;
  padding: 0 9px;
  border: 1px solid var(--line);
  background: #fbfaf7;
}

.scan-analysis {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.scan-analysis:first-of-type {
  border-top: 0;
}

.scan-analysis + .scan-analysis {
  margin-top: 22px;
}

.scan-analysis-title {
  color: var(--muted);
  font-size: 12px !important;
  font-weight: 700;
}

.analysis-section {
  margin-top: 16px;
}

.analysis-section h3 {
  margin-bottom: 8px;
  color: var(--olive);
  font-size: 12px;
  text-transform: uppercase;
}

.vocab-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 6px;
}

.vocab-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fbfaf7;
  color: var(--muted);
  font-size: 12px;
}

.vocab-row span:first-child {
  color: var(--ink);
  font-weight: 650;
}

.vocab-list.hide-fr .vocab-row {
  grid-template-columns: 1fr;
}

.vocab-list.hide-fr .vocab-row span:last-child {
  display: none;
}

.muted-small {
  color: var(--muted) !important;
  font-size: 12px !important;
}

.doc-nav {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 16px;
}

.nav-button[disabled] {
  cursor: not-allowed;
  opacity: 0.42;
}

.scan-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  align-items: start;
}

.scan-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.scan-image-wrap {
  position: relative;
}

.scan-image-wrap img {
  display: block;
  width: 100%;
  height: auto;
}

.image-open-button {
  position: absolute;
  top: 10px;
  right: 10px;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(221, 215, 202, 0.85);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  opacity: 0;
  box-shadow: 0 10px 24px rgba(32, 28, 20, 0.12);
  transform: translateY(-2px);
  transition:
    opacity 140ms ease,
    transform 140ms ease,
    background 140ms ease;
}

.image-open-button {
  cursor: zoom-in;
}

.image-open-button:hover,
.image-open-button:focus-visible {
  background: var(--panel);
}

.image-open-button svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.scan-card:hover .image-open-button,
.scan-card:focus-within .image-open-button {
  opacity: 1;
  transform: translateY(0);
}

.scan-caption {
  padding: 9px 10px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 11px;
}

.lightbox-open {
  overflow: hidden;
}

.image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(16, 15, 13, 0.92);
  cursor: zoom-out;
}

.image-lightbox.hidden {
  display: none;
}

.image-lightbox img {
  display: block;
  max-width: min(100%, 1600px);
  max-height: calc(100vh - 36px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  cursor: default;
}

.lightbox-close {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 101;
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 26px;
  line-height: 1;
}

.lightbox-close:hover,
.lightbox-close:focus-visible {
  background: rgba(255, 255, 255, 0.2);
}

.empty-scan {
  padding: 18px;
  border: 1px dashed #cfc6b8;
  border-radius: var(--radius);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.56);
  font-size: 12px;
}

@keyframes swipeOutLeft {
  from {
    opacity: 1;
  }

  to {
    opacity: 0;
    transform: translateX(-180px) rotate(-18deg);
  }
}

@keyframes swipeOutRight {
  from {
    opacity: 1;
  }

  to {
    opacity: 0;
    transform: translateX(180px) rotate(18deg);
  }
}

@media (max-width: 880px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .chapter-rail {
    position: static;
    height: auto;
    padding: 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail-section {
    margin-top: 16px;
  }

  .chapter-nav {
    display: flex;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .chapter-tab {
    min-width: 180px;
  }

  .topbar {
    padding: 0 16px;
  }

  .view {
    padding: 28px 16px 44px;
  }

  .chapter-header,
  .flashcards-hero,
  .study-grid,
  .reader-grid {
    grid-template-columns: 1fr;
  }

  .flashcards-stats {
    grid-template-columns: 1fr;
  }

  .flashcard-stage {
    grid-template-columns: 1fr;
  }

  .swipe-hint-left,
  .swipe-hint-right {
    text-align: center;
  }

  .side-notes,
  .scan-panel {
    position: static;
  }
}

@media (max-width: 560px) {
  .topbar-status {
    display: none;
  }

  .chapter-tools,
  .flashcards-tools,
  .doc-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .nav-button {
    width: 100%;
  }

  .flashcards-actions {
    display: flex;
    gap: 16px;
  }

  .flashcards-actions .nav-button {
    flex: 1;
    padding: 24px 16px;
    font-size: 0;
    line-height: 0;
    justify-content: center;
    align-items: center;
  }

  .flashcards-nope::before {
    content: "✕";
    font-size: 24px;
    line-height: 1;
    color: var(--accent);
  }

  .flashcards-know::before {
    content: "✓";
    font-size: 24px;
    line-height: 1;
    color: var(--olive);
  }

  .flashcard {
    min-height: 320px;
  }

  .flashcard-face {
    padding: 22px;
  }
}

.repassos-grid {
  align-items: start;
}

.repassos-card {
  display: grid;
  gap: 8px;
  text-align: left;
}

.repassos-card summary {
  list-style: none;
  cursor: pointer;
}

.repassos-card summary::-webkit-details-marker {
  display: none;
}

.repassos-summary {
  display: grid;
  gap: 6px;
}

.repassos-details {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.repassos-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-bottom: 12px;
}

.repassos-links > span {
  color: var(--olive);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.repassos-link {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fbfaf7;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.repassos-link:hover {
  border-color: #c9c0b1;
  background: #fffdf9;
}

.repassos-details ul {
  margin: 0;
  padding-left: 18px;
}

.repassos-text {
  margin: 0;
  white-space: pre-wrap;
  font-family: var(--font-text);
  font-size: 13px;
  color: var(--muted);
}

.repassos-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.repasso-section {
  display: grid;
  gap: 12px;
}

.linked-repassos-list {
  display: grid;
  gap: 8px;
}

.linked-repasso-card {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfaf7;
}

.linked-repasso-card summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  cursor: pointer;
}

.linked-repasso-card summary::-webkit-details-marker {
  display: none;
}

.linked-repasso-card .repassos-text {
  margin-top: 12px;
}

.grammar-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.grammar-topic-list {
  display: grid;
  gap: 14px;
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 96px);
  padding-right: 6px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.grammar-topic-group {
  display: grid;
  gap: 7px;
}

.grammar-topic-separator {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.grammar-topic-separator::before,
.grammar-topic-separator::after {
  content: "";
  height: 1px;
  background: var(--line);
}

.grammar-topic-separator::before {
  width: 14px;
}

.grammar-topic-separator::after {
  flex: 1;
}

.grammar-topic {
  display: grid;
  gap: 4px;
  width: 100%;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--muted);
  text-align: left;
}

.grammar-topic:hover,
.grammar-topic.active {
  border-color: #c9c0b1;
  background: #fffdf9;
  color: var(--ink);
}

.grammar-topic strong {
  color: inherit;
  font-size: 13px;
}

.grammar-topic span {
  font-size: 11px;
}

.grammar-panel {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.grammar-rule {
  display: grid;
  gap: 10px;
}

.grammar-rule h2 {
  margin: 0;
  color: var(--ink);
  font-size: 24px;
  text-transform: none;
}

.grammar-subtitle {
  margin: -2px 0 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.grammar-rule p {
  margin: 0;
}

.grammar-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.grammar-examples span {
  display: inline-flex;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fbfaf7;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.grammar-course {
  display: grid;
  gap: 14px;
  background:
    linear-gradient(135deg, rgba(255, 253, 249, 0.94), rgba(246, 241, 230, 0.72)),
    var(--panel);
}

.grammar-course-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.grammar-course-head h3 {
  margin: 0;
  color: var(--ink);
  font-size: 19px;
}

.grammar-course-use {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.grammar-course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.grammar-course-section {
  display: grid;
  gap: 9px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.62);
}

.grammar-course-section h3 {
  margin: 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.grammar-course-section ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding-left: 18px;
  color: #302d29;
  font-size: 13px;
  line-height: 1.45;
}

.grammar-ending-grid,
.grammar-irregular-grid {
  display: grid;
  gap: 8px;
}

.grammar-ending-card,
.grammar-irregular-card {
  display: grid;
  gap: 4px;
  padding: 10px;
  border: 1px solid rgba(201, 192, 177, 0.72);
  border-radius: 9px;
  background: #fffdf9;
}

.grammar-ending-card strong,
.grammar-irregular-card strong {
  color: var(--ink);
  font-size: 13px;
}

.grammar-ending-card span,
.grammar-irregular-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.grammar-irregulars {
  border-color: rgba(177, 38, 28, 0.22);
  background: rgba(255, 248, 244, 0.78);
}

.grammar-irregular-card p {
  margin: 0;
  color: #302d29;
  font-size: 12px;
  line-height: 1.4;
}

.grammar-exercise-list {
  display: grid;
  gap: 8px;
}

.grammar-subsections {
  display: grid;
  gap: 16px;
}

.grammar-subsection {
  display: grid;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
}

.grammar-subsection-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
}

.grammar-subsection-head h3 {
  margin: 0;
  color: var(--ink);
  font-size: 18px;
}

.grammar-subsection-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.grammar-exercise {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(32, 28, 20, 0.05);
}

.grammar-exercise summary {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  list-style: none;
  cursor: pointer;
}

.grammar-exercise summary::-webkit-details-marker {
  display: none;
}

.grammar-exercise summary strong {
  color: var(--ink);
  font-size: 14px;
  line-height: 1.35;
}

.grammar-answer {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.grammar-answer p {
  display: grid;
  gap: 3px;
  margin: 0;
  color: #302d29;
  font-size: 13px;
}

.grammar-answer span {
  color: var(--olive);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

@media (max-width: 880px) {
  .grammar-layout {
    grid-template-columns: 1fr;
  }

  .grammar-topic-list {
    position: static;
    max-height: none;
    padding-right: 0;
    overflow: visible;
  }

  .grammar-course-grid {
    grid-template-columns: 1fr;
  }
}