:root {
  --bg: #f6f8fc;
  --bg2: #eef4ff;
  --panel: rgba(255, 255, 255, 0.90);
  --panel-strong: rgba(255, 255, 255, 0.98);
  --text: #101827;
  --muted: #526074;
  --line: rgba(15, 23, 42, 0.12);
  --primary: #1d4ed8;
  --primary-strong: #1e40af;
  --good: #16a34a;
  --good-bg: #dcfce7;
  --bad: #dc2626;
  --bad-bg: #fee2e2;
  --warn: #ca8a04;
  --warn-bg: #fef9c3;
  --shadow: 0 22px 70px rgba(30, 41, 59, .16);
  --small-shadow: 0 12px 30px rgba(30, 41, 59, .10);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --font: Georgia, "Times New Roman", Times, serif;
  --reading-font: Georgia, "Times New Roman", Times, serif;
  --glow-1: rgba(37, 99, 235, .18);
  --glow-2: rgba(249, 115, 22, .14);
  --card-texture: none;
}

[data-theme="cream"] {
  --bg: #f5edcf;
  --bg2: #fff8dc;
  --panel: rgba(255, 248, 220, 0.92);
  --panel-strong: rgba(255, 252, 234, 0.99);
  --text: #2b2418;
  --muted: #6c6048;
  --line: rgba(91, 70, 33, 0.18);
  --primary: #9a6100;
  --primary-strong: #764700;
  --good: #287a3e;
  --good-bg: #e9f5d8;
  --bad: #a33a2f;
  --bad-bg: #f8dfd2;
  --warn: #9a6100;
  --warn-bg: #fff0b8;
  --shadow: 0 22px 70px rgba(79, 57, 24, .18);
  --small-shadow: 0 12px 30px rgba(79, 57, 24, .10);
  --glow-1: rgba(250, 204, 21, .26);
  --glow-2: rgba(180, 83, 9, .12);
  --card-texture: linear-gradient(180deg, rgba(255,255,255,.42), rgba(255,255,255,.05));
}

[data-theme="cream"] .glass-card,
[data-theme="cream"] .sidebar {
  background-image: var(--card-texture);
}

[data-theme="cream"] .question-card {
  border-color: rgba(119, 83, 24, .22);
}

[data-theme="cream"] .topic-pill.active,
[data-theme="cream"] .subtopic-btn.active,
[data-theme="cream"] .subtopic-btn:hover {
  background: rgba(154, 97, 0, .13);
  color: var(--primary-strong);
}


[data-theme="dark"] {
  --bg: #07111f;
  --bg2: #111827;
  --panel: rgba(15, 23, 42, 0.78);
  --panel-strong: rgba(15, 23, 42, 0.96);
  --text: #e5e7eb;
  --muted: #94a3b8;
  --line: rgba(226, 232, 240, 0.13);
  --primary: #60a5fa;
  --primary-strong: #3b82f6;
  --good: #4ade80;
  --good-bg: rgba(22, 163, 74, .18);
  --bad: #f87171;
  --bad-bg: rgba(220, 38, 38, .16);
  --warn: #facc15;
  --warn-bg: rgba(234, 179, 8, .16);
  --shadow: 0 22px 70px rgba(0,0,0,.35);
  --small-shadow: 0 12px 30px rgba(0,0,0,.22);
  --glow-1: rgba(96, 165, 250, .16);
  --glow-2: rgba(14, 165, 233, .10);
}


* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); font-size: 17px; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; overflow-x: hidden; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: linear-gradient(135deg, var(--bg), var(--bg2));
  overflow-x: hidden;
  line-height: 1.58;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection { background: color-mix(in srgb, var(--primary) 22%, transparent); }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
code { font-size: .9em; padding: .1rem .35rem; border-radius: 7px; background: rgba(148,163,184,.15); }

.unlock-screen {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 22px;
  background: linear-gradient(135deg, var(--bg), var(--bg2));
}
.unlock-screen[hidden] { display: none; }
.unlock-card {
  width: min(420px, 100%);
  border-radius: var(--radius-xl);
  padding: 28px;
  display: grid;
  gap: 14px;
}
.unlock-card h1 { margin: 0; letter-spacing: 0; }
.unlock-card p { margin: 0; }
.unlock-input {
  width: 100%;
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  background: var(--panel-strong);
  padding: 12px 14px;
  outline: none;
}
.unlock-input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37,99,235,.12); }
.note-status.error { color: var(--bad); }
body.locked .app-shell {
  filter: blur(3px);
  pointer-events: none;
  user-select: none;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  padding: 18px;
}
.glass-card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--small-shadow);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}
.sidebar {
  position: sticky;
  top: 18px;
  height: calc(100vh - 36px);
  border-radius: var(--radius-xl);
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: auto;
  z-index: 20;
}
.brand-block { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.brand-mark {
  width: 48px; height: 48px; border-radius: 16px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), #f97316);
  color: white; font-weight: 900; font-size: 1.6rem;
  box-shadow: 0 10px 22px rgba(37,99,235,.24);
}
.brand-title { font-weight: 900; letter-spacing: -.02em; font-size: 1.08rem; }
.brand-subtitle { color: var(--muted); font-size: .95rem; margin-top: 2px; }
.bank-box { padding: 14px; border-radius: 18px; margin-bottom: 14px; }
.field-label { display:block; color: var(--muted); font-weight: 800; font-size: .9rem; margin-bottom: 8px; }
.select, .search-input {
  width: 100%; color: var(--text); background: var(--panel-strong);
  border: 1px solid var(--line); border-radius: 14px; outline: none;
  padding: 13px 15px;
  font-size: 1rem;
  line-height: 1.35;
}
.select:focus, .search-input:focus, .note-box:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37,99,235,.12); }
.bank-actions { display:flex; gap: 8px; margin-top: 10px; }
.mode-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.mode-switch-btn {
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--panel-strong);
  border-radius: 13px;
  padding: 11px 12px;
  font-weight: 900;
  min-width: 0;
  line-height: 1.15;
}
.mode-switch-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.tiny-btn, .soft-btn, .icon-btn, .topic-pill, .full-btn, .nav-btn, .danger-btn {
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--panel-strong);
  border-radius: 13px;
  padding: 10px 12px;
  transition: transform .12s ease, background .12s ease, border-color .12s ease, box-shadow .12s ease;
}
.tiny-btn { flex: 1; font-size: .92rem; padding: 10px 10px; color: var(--muted); font-weight: 800; }
.soft-btn { font-weight: 800; white-space: nowrap; }
.icon-btn { width: 42px; height: 42px; display: grid; place-items: center; font-size: 1.2rem; }
button:hover { transform: translateY(-1px); box-shadow: 0 8px 16px rgba(30,41,59,.08); }
button:active { transform: translateY(0); box-shadow: none; }
.primary, .nav-btn.primary, .full-btn.primary { background: var(--primary); border-color: var(--primary); color: white; }
.danger-btn { color: var(--bad); font-weight: 800; }
.danger-btn.muted { color: var(--muted); }
.topic-tools { display: grid; gap: 8px; margin: 12px 0 14px; }
.topic-pill { text-align: left; font-weight: 800; padding: 11px 12px; color: var(--muted); }
.topic-pill.active { background: rgba(37,99,235,.12); border-color: rgba(37,99,235,.32); color: var(--primary); }
.topic-tree { display: grid; gap: 10px; padding-bottom: 30px; }
.topic-group { border: 1px solid var(--line); border-radius: 18px; overflow: hidden; background: rgba(255,255,255,.22); }
[data-theme="dark"] .topic-group { background: rgba(15,23,42,.3); }
.topic-head-row {
  display: grid;
  grid-template-columns: 1fr 42px;
  align-items: stretch;
}
.topic-head {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  width: 100%; padding: 12px; border: 0; background: transparent; color: var(--text); font-weight: 900; text-align: left;
}
.topic-count { color: var(--muted); font-weight: 850; font-size: .88rem; }
.collapse-topic-btn {
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-weight: 950;
  font-size: 1.1rem;
  box-shadow: none;
}
.topic-group.collapsed .subtopic-list { display: none; }
.topic-head.completed span:first-child,
.subtopic-btn.completed span:first-child {
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  text-decoration-color: currentColor;
  opacity: .68;
}
.topic-head.completed .topic-count,
.subtopic-btn.completed span:last-child { opacity: .62; }
.subtopic-list { display: grid; gap: 4px; padding: 0 8px 8px; }
.subtopic-btn {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  width: 100%; border: 0; border-radius: 12px; background: transparent; color: var(--muted);
  padding: 10px 11px; text-align: left; font-size: .98rem; line-height: 1.35;
}
.subtopic-btn.active, .subtopic-btn:hover { background: rgba(37,99,235,.10); color: var(--primary); box-shadow: none; }
.main-panel { min-width: 0; display: grid; gap: 16px; align-content: start; }
body.notes-mode .app-shell { display: none; }
.notes-view {
  min-height: 100vh;
  padding: 8px;
  display: block;
  animation: externalModeFade .18s ease both;
  background: linear-gradient(135deg, var(--bg), var(--bg2));
  color: var(--text);
}
.notes-view[hidden] { display: none; }
.notes-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 72px;
  margin-bottom: 8px;
  padding: 12px 14px;
  position: sticky;
  top: 8px;
  z-index: 40;
}
.physical-view {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 6px;
}
.knowledge-view {
  min-height: 100vh;
}
.knowledge-shell {
  display: grid;
  gap: 12px;
}
.knowledge-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, .72fr);
  gap: 14px;
  align-items: end;
  padding: 16px;
  border-radius: var(--radius-lg);
}
.knowledge-toolbar h2 {
  margin: 2px 0 4px;
  font-size: clamp(1.25rem, 2.5vw, 1.85rem);
  letter-spacing: 0;
}
.knowledge-toolbar p {
  margin: 0;
  color: var(--muted);
  font-weight: 800;
}
.knowledge-controls {
  display: grid;
  grid-template-columns: minmax(170px, .42fr) minmax(0, 1fr);
  gap: 10px;
}
.knowledge-deck-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  min-height: 50px;
  padding: 6px 10px;
  background: var(--panel-strong);
}
.knowledge-deck-picker span {
  color: var(--muted);
  font-size: .78rem;
  font-weight: 900;
}
.knowledge-deck-picker select {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 900;
}
.knowledge-layout {
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}
.knowledge-rail {
  position: sticky;
  top: 92px;
  max-height: calc(100vh - 112px);
  overflow: auto;
  padding: 12px;
  border-radius: var(--radius-lg);
}
.knowledge-deck-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}
.knowledge-tab {
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--panel-strong);
  color: var(--muted);
  min-height: 42px;
  padding: 8px 10px;
  font-weight: 900;
  text-align: left;
}
.knowledge-tab span {
  display: block;
  font-size: .78rem;
  font-weight: 800;
  opacity: .78;
}
.knowledge-tab.active {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}
.knowledge-slide-list {
  display: grid;
  gap: 7px;
}
.knowledge-list-item {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 10px 11px;
  color: var(--text);
  background: color-mix(in srgb, var(--panel-strong) 82%, transparent);
  text-align: left;
  box-shadow: none;
}
.knowledge-list-item span {
  display: block;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 900;
  margin-bottom: 3px;
}
.knowledge-list-item strong {
  display: block;
  font-size: .95rem;
  line-height: 1.25;
}
.knowledge-list-item.active {
  border-color: color-mix(in srgb, var(--primary) 54%, var(--line));
  background: color-mix(in srgb, var(--primary) 12%, var(--panel-strong));
}
.knowledge-card {
  min-height: calc(100vh - 166px);
  border-radius: var(--radius-xl);
  padding: clamp(18px, 3vw, 34px);
  overflow: hidden;
}
.knowledge-card-head h2 {
  margin: 10px 0 8px;
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  line-height: 1.12;
  letter-spacing: 0;
}
.knowledge-card-head p {
  margin: 0 0 18px;
  color: var(--muted);
  max-width: 920px;
}
.knowledge-image-section,
.knowledge-section,
.knowledge-rendered {
  margin-top: 22px;
}
.knowledge-image-section h3,
.knowledge-section h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}
.knowledge-image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}
.knowledge-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--panel-strong);
}
.knowledge-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 72vh;
  object-fit: contain;
  background: #fff;
}
.knowledge-figure figcaption {
  padding: 8px 10px;
  color: var(--muted);
  font-size: .86rem;
  font-weight: 800;
}
.knowledge-rendered {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
  background: color-mix(in srgb, var(--panel-strong) 70%, transparent);
}
.knowledge-rendered summary {
  cursor: pointer;
  font-weight: 950;
}
.knowledge-rendered .knowledge-figure {
  margin-top: 12px;
}
.knowledge-qa-list {
  display: grid;
  gap: 10px;
}
.knowledge-qa {
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--panel-strong);
  padding: 12px 14px;
}
.knowledge-qa summary {
  cursor: pointer;
  font-weight: 950;
  line-height: 1.35;
}
.knowledge-answer,
.knowledge-notes-body {
  padding-top: 10px;
  color: var(--text);
}
.knowledge-answer h2,
.knowledge-notes-body h2,
.knowledge-answer h3,
.knowledge-notes-body h3 {
  margin: .35rem 0 .45rem;
  font-size: 1.05rem;
  line-height: 1.25;
  letter-spacing: 0;
}
.knowledge-answer ul,
.knowledge-notes-body ul {
  margin: .45rem 0 .45rem 1.1rem;
  padding: 0;
}
.knowledge-answer li,
.knowledge-notes-body li {
  margin: .28rem 0;
}
.knowledge-answer table,
.knowledge-notes-body table {
  border-collapse: collapse;
  width: 100%;
  min-width: 520px;
}
.knowledge-answer th,
.knowledge-answer td,
.knowledge-notes-body th,
.knowledge-notes-body td {
  border: 1px solid var(--line);
  padding: .52rem .62rem;
  vertical-align: top;
}
.knowledge-answer th,
.knowledge-notes-body th {
  background: color-mix(in srgb, var(--primary) 10%, var(--panel-strong));
}
.knowledge-answer .table-scroll,
.knowledge-notes-body .table-scroll {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  margin: 10px 0;
}
.knowledge-answer .note-line,
.knowledge-notes-body .note-line {
  display: grid;
  grid-template-columns: 1.1rem minmax(0, 1fr);
  gap: .35rem;
  margin: .32rem 0;
}
.knowledge-answer .level-1,
.knowledge-notes-body .level-1 { margin-left: 1.15rem; }
.knowledge-answer .level-2,
.knowledge-notes-body .level-2 { margin-left: 2.3rem; }
.knowledge-answer .level-3,
.knowledge-notes-body .level-3 { margin-left: 3.45rem; }
.knowledge-answer .bullet,
.knowledge-notes-body .bullet {
  color: var(--primary);
  font-weight: 900;
}
.knowledge-answer .high-yield,
.knowledge-notes-body .high-yield {
  border-radius: 10px;
  background: color-mix(in srgb, var(--warn-bg) 70%, transparent);
  padding: 4px 6px;
}
.knowledge-answer .danger,
.knowledge-notes-body .danger {
  color: var(--bad);
  text-decoration-color: currentColor;
  text-decoration-thickness: 2px;
}
.knowledge-empty-small {
  color: var(--muted);
  font-weight: 850;
  text-align: center;
  padding: 16px 8px;
}
.knowledge-nav {
  display: grid;
  grid-template-columns: minmax(130px, 1fr) auto minmax(130px, 1fr);
  gap: 10px;
  align-items: center;
  padding-bottom: 10px;
}
.knowledge-nav .position-label {
  margin: 0;
  min-width: 72px;
  text-align: center;
}
body.knowledge-focus-mode .knowledge-view {
  padding: 0;
}
body.knowledge-focus-mode .knowledge-view .notes-topbar,
body.knowledge-focus-mode .knowledge-toolbar,
body.knowledge-focus-mode .knowledge-rail {
  display: none;
}
body.knowledge-focus-mode .knowledge-layout {
  display: block;
}
body.knowledge-focus-mode .knowledge-card {
  min-height: 100vh;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  padding: clamp(22px, 5vw, 72px);
}
body.knowledge-focus-mode .knowledge-nav {
  position: fixed;
  right: max(12px, env(safe-area-inset-right));
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 70;
  grid-template-columns: auto auto auto;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.physical-view[hidden] { display: none; }
.physical-view .notes-topbar {
  margin: 0;
  min-height: 54px;
  padding: 8px 10px;
}
.physical-view .notes-topbar h1 {
  margin: 2px 0 0;
  font-size: clamp(1.05rem, 2.2vw, 1.45rem);
}
.physical-frame {
  height: calc(100vh - 76px);
  min-height: 0;
}
.physical-module-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  min-height: 42px;
  padding: 6px 10px;
  background: rgba(255,255,255,.34);
  color: var(--text);
  box-shadow: none;
}
.physical-module-picker span {
  color: var(--muted);
  font-size: .78rem;
  font-weight: 900;
  white-space: nowrap;
}
.physical-module-picker select {
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 950;
  min-width: 168px;
  outline: 0;
}
[data-theme="dark"] .physical-module-picker {
  background: rgba(15,23,42,.38);
}
@keyframes externalModeFade {
  from { opacity: .35; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}
.notes-topbar h1 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
  line-height: 1.05;
  letter-spacing: 0;
  color: var(--text);
}
.notes-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}
.notes-actions .soft-btn.active {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}
.notes-open-link {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.sota-frame {
  width: 100%;
  height: calc(100vh - 96px);
  min-height: 640px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}
.summary-view {
  overflow-x: hidden;
}
.summary-shell {
  width: min(1420px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 14px;
}
.summary-toolbar {
  display: grid;
  grid-template-columns: minmax(260px, .62fr) minmax(320px, 1fr);
  gap: 18px;
  align-items: start;
  border-radius: var(--radius-xl);
  padding: 18px;
}
.summary-toolbar h2,
.summary-group-head h2,
.summary-card h2 {
  letter-spacing: 0;
  color: var(--text);
}
.summary-toolbar h2 {
  margin: 6px 0 4px;
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.08;
}
.summary-toolbar p {
  margin: 0;
  font-weight: 850;
}
.summary-controls {
  display: grid;
  gap: 10px;
}
.summary-study-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}
.summary-focus-bar {
  display: none;
  position: sticky;
  top: max(8px, env(safe-area-inset-top));
  z-index: 55;
  justify-self: end;
  gap: 8px;
  padding: 8px;
  border-radius: 999px;
}
.summary-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.summary-filter {
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--muted);
  border-radius: 999px;
  padding: 8px 11px;
  font-weight: 900;
  line-height: 1.2;
}
.summary-filter span {
  color: inherit;
  opacity: .76;
  margin-left: 4px;
}
.summary-filter.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.summary-content {
  display: grid;
  gap: 22px;
  padding-bottom: 30px;
}
.summary-group {
  display: grid;
  gap: 12px;
}
.summary-group-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  padding: 0 4px;
}
.summary-group-head h2 {
  margin: 5px 0 0;
  font-size: clamp(1.12rem, 2vw, 1.55rem);
  line-height: 1.18;
}
.summary-group-head span {
  min-width: 42px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 950;
}
.summary-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  max-width: 980px;
  margin: 0 auto;
}
.summary-card {
  border-radius: var(--radius-lg);
  padding: 18px;
  display: grid;
  gap: 12px;
}
.summary-card.seen {
  border-color: color-mix(in srgb, var(--good) 30%, var(--line));
}
.summary-card h2 {
  margin: 0;
  font-size: clamp(1.08rem, 1.2vw, 1.34rem);
  line-height: 1.24;
}
.summary-seen-badge {
  margin-left: auto;
  background: color-mix(in srgb, var(--good) 12%, var(--panel-strong));
  color: var(--good);
}
.summary-card:not(.seen) .summary-seen-badge {
  background: var(--panel-strong);
  color: var(--muted);
}
.summary-prompt {
  margin: 0;
  color: var(--text);
  font-weight: 900;
}
.summary-rich {
  color: var(--text);
  line-height: 1.58;
}
.summary-rich p {
  color: var(--text);
}
.summary-rich ul,
.summary-rich ol {
  margin: 8px 0 8px 22px;
  padding: 0;
}
.summary-rich li {
  margin: 5px 0;
}
.summary-rich .key,
.summary-rich strong,
.summary-rich b {
  color: var(--text);
  font-weight: 950;
}
.summary-image {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 10px;
  background: var(--panel-strong);
}
.summary-image img {
  display: block;
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  border-radius: 10px;
  background: transparent;
}
.summary-image figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.35;
}
.summary-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-strong);
}
.summary-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 460px;
  font-size: .94rem;
}
.summary-table th,
.summary-table td {
  border-bottom: 1px solid var(--line);
  padding: 9px 10px;
  vertical-align: top;
  text-align: left;
}
.summary-table tr:last-child th,
.summary-table tr:last-child td {
  border-bottom: 0;
}
.summary-table th {
  width: 96px;
  color: var(--primary);
  font-weight: 950;
  background: color-mix(in srgb, var(--primary) 8%, transparent);
}
.summary-detail {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}
.summary-detail summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  font-weight: 950;
  color: var(--primary);
  list-style-position: inside;
}
.summary-detail summary::-webkit-details-marker {
  margin-right: 6px;
}
.summary-detail .summary-rich {
  margin-top: 9px;
}
.summary-answer-body {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}
.summary-answer-section {
  display: grid;
  gap: 8px;
}
.summary-answer-section h3 {
  margin: 0;
  font-size: .92rem;
  line-height: 1.2;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.summary-muted {
  margin: 0;
  color: var(--muted);
}
.summary-aids {
  display: grid;
  gap: 8px;
}
.summary-aids > div {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 11px;
  background: color-mix(in srgb, var(--panel-strong) 82%, transparent);
}
.summary-aids span {
  display: block;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 950;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.summary-aids p {
  margin: 4px 0 0;
  color: var(--text);
  line-height: 1.48;
}
.topbar {
  position: sticky; top: 18px; z-index: 10;
  border-radius: var(--radius-xl);
  padding: 12px;
  display: flex; gap: 12px; align-items: center;
}
.search-wrap { position: relative; flex: 1; }
.search-icon { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--muted); font-weight: 900; }
.search-input { padding-left: 40px; font-size: 1rem; }
.topbar-actions { display: flex; gap: 9px; align-items: center; }
.font-control {
  min-width: 46px;
  font-weight: 950;
  font-size: 1.08rem;
  padding-inline: 12px;
}
.font-control.small { font-size: .96rem; }
.font-control.large { font-size: 1.22rem; }
.mobile-only { display: none; }
.hero-grid { display: grid; grid-template-columns: 1fr 360px; gap: 16px; }
.hero-card, .progress-card { border-radius: var(--radius-xl); padding: 22px; }
.hero-card { display: flex; align-items: stretch; justify-content: space-between; gap: 18px; }
.eyebrow { color: var(--primary); font-weight: 900; text-transform: uppercase; letter-spacing: .08em; font-size: .74rem; }
h1 { font-size: clamp(1.6rem, 3.4vw, 2.7rem); line-height: 1; margin: 8px 0 8px; letter-spacing: -.055em; }
p { color: var(--muted); line-height: 1.65; }
.hero-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; min-width: min(460px, 100%); }
.hero-stats > div {
  border: 1px solid var(--line); background: rgba(255,255,255,.34); border-radius: 18px; padding: 14px;
  display: flex; flex-direction: column; justify-content: center;
}
[data-theme="dark"] .hero-stats > div { background: rgba(15,23,42,.34); }
.hero-stats strong { font-size: 1.6rem; letter-spacing: -.04em; }
.hero-stats span { color: var(--muted); font-size: .78rem; font-weight: 800; margin-top: 4px; }
.progress-card { display: grid; align-content: center; gap: 12px; }
#aiQuotaBtn,
#aiExplainBtn,
#syncNowBtn,
#importBankBtn,
#refreshBanksBtn,
#importProgressBtn {
  display: none !important;
}
.progress-header { display:flex; justify-content:space-between; color: var(--muted); font-weight: 900; }
.meter { height: 13px; border-radius: 999px; background: rgba(148,163,184,.22); overflow:hidden; }
.meter-fill { height:100%; width:0%; background: linear-gradient(90deg, var(--primary), var(--good)); border-radius: inherit; transition: width .25s ease; }
.progress-text { color: var(--muted); font-size: .88rem; }
.study-layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 16px; align-items: start; }
.question-card { border-radius: var(--radius-xl); padding: 26px; min-height: 500px; box-shadow: var(--shadow); }
.q-meta { display:flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.badge { display:inline-flex; align-items:center; gap: 6px; border-radius: 999px; padding: 8px 12px; font-size: .86rem; font-weight: 900; color: var(--muted); background: rgba(148,163,184,.14); border: 1px solid var(--line); line-height: 1.25; }
.badge.primary { color: var(--primary); background: rgba(37,99,235,.11); border-color: rgba(37,99,235,.22); }
.badge.good { color: var(--good); background: var(--good-bg); }
.badge.bad { color: var(--bad); background: var(--bad-bg); }
.q-title { font-family: var(--reading-font); font-size: clamp(1.28rem, 2.1vw, 1.7rem); line-height: 1.44; letter-spacing: -.018em; margin: 0 0 24px; font-weight: 900; max-width: 980px; }
.question-images { display: grid; gap: 12px; margin: 6px 0 18px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.answer-images { margin-top: 16px; margin-bottom: 4px; }
.question-image { margin: 0; border: 1px solid var(--line); border-radius: 16px; padding: 10px; background: transparent; overflow: clip; }
.question-image img { width: 100%; height: auto; display: block; border-radius: 10px; background: transparent; }
.question-image figcaption { margin-top: 8px; display: grid; gap: 4px; font-size: .84rem; line-height: 1.45; color: var(--muted); overflow-wrap: anywhere; }
.image-meta { color: var(--muted); font-size: .8rem; }
.short-answer-card { border: 1px solid var(--line); border-radius: 18px; padding: 16px 17px; background: var(--panel-strong); margin-bottom: 14px; }
.short-answer-card.revealed { border-color: rgba(37,99,235,.24); background: color-mix(in srgb, var(--panel-strong) 86%, rgba(37,99,235,.08)); }
.short-answer-label { font-size: .84rem; font-weight: 950; letter-spacing: .02em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.short-answer-text { font-family: var(--reading-font); font-size: 1.02rem; line-height: 1.62; color: var(--text); white-space: pre-wrap; }
.show-answer-btn { width: 100%; min-height: 70px; border-radius: 18px; border: 1px solid rgba(37,99,235,.32); background: rgba(37,99,235,.10); color: var(--primary); font-weight: 950; font-size: 1.04rem; }
.show-answer-btn:hover { background: rgba(37,99,235,.16); }
.options { display: grid; gap: 11px; }
.option-btn {
  width: 100%; display: grid; grid-template-columns: 48px 1fr auto; gap: 14px; align-items: center;
  border: 1px solid var(--line); background: var(--panel-strong); color: var(--text); border-radius: 20px; padding: 16px 17px;
  text-align: left; min-height: 70px;
  transition: transform .08s ease, border-color .12s ease, background .12s ease;
}
.option-btn:active { transform: scale(.995); }
.option-btn:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 35%, transparent); outline-offset: 2px; }
.option-label { width: 40px; height: 40px; border-radius: 13px; display:grid; place-items:center; font-weight: 950; background: rgba(148,163,184,.16); color: var(--muted); font-size: .98rem; }
.option-text { font-family: var(--reading-font); line-height: 1.58; font-size: 1.02rem; letter-spacing: .003em; }
.option-status { font-weight: 950; font-size: .95rem; line-height: 1.25; }
.option-btn.correct { border-color: rgba(22, 163, 74, .45); background: var(--good-bg); }
.option-btn.correct .option-label { background: var(--good); color: white; }
.option-btn.incorrect { border-color: rgba(220,38,38,.45); background: var(--bad-bg); }
.option-btn.incorrect .option-label { background: var(--bad); color: white; }
.option-btn.crossed-out .option-text {
  text-decoration: line-through;
  text-decoration-thickness: 3px;
  opacity: .48;
}
.option-btn.crossed-out {
  border-style: dashed;
  background: color-mix(in srgb, var(--panel-strong) 82%, rgba(148,163,184,.18));
}
.feedback { margin-top: 18px; border-radius: 20px; padding: 18px; border: 1px solid var(--line); display: none; font-size: 1rem; }
.feedback.show { display: block; animation: pop .16s ease-out; }
.feedback.correct { background: var(--good-bg); border-color: rgba(22,163,74,.36); }
.feedback.incorrect { background: var(--bad-bg); border-color: rgba(220,38,38,.36); }
.feedback.neutral { background: var(--warn-bg); border-color: rgba(202,138,4,.32); }
.feedback h3 { margin: 0 0 10px; font-size: 1.08rem; }
.feedback p { margin: 8px 0 0; color: var(--text); }
.explanation { font-family: var(--reading-font); margin-top: 14px; border-top: 1px solid var(--line); padding-top: 14px; line-height: 1.62; max-width: 1000px; }
.explanation p { margin: 10px 0; }
.explanation ul,
.explanation ol,
.ai-answer ul,
.ai-answer ol { margin: 10px 0 10px 22px; padding: 0; }
.explanation li,
.ai-answer li { margin: 6px 0; }
.markdown-table-wrap { width: 100%; overflow-x: auto; margin: 12px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--panel-strong); }
.markdown-table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: .92rem; line-height: 1.42; }
.markdown-table th,
.markdown-table td { padding: 9px 10px; border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); vertical-align: top; text-align: left; }
.markdown-table th { background: color-mix(in srgb, var(--primary) 10%, transparent); font-weight: 950; }
.markdown-table tr:last-child td { border-bottom: 0; }
.markdown-table th:last-child,
.markdown-table td:last-child { border-right: 0; }
.option-term-highlight { font-weight: 950; }
.option-term-highlight.correct-term {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  text-decoration-color: var(--good);
}
.option-teaching { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 14px; }
.option-teaching-list { display:grid; gap:10px; margin-top:10px; }
.option-teaching-item { display:grid; grid-template-columns:42px 1fr; gap:10px; align-items:start; padding:10px 12px; border:1px solid var(--line); border-radius:14px; background:var(--panel-strong); }
.option-teaching-label { width:34px; height:34px; border-radius:10px; display:grid; place-items:center; font-weight:900; background:rgba(148,163,184,.16); color:var(--muted); }
.option-teaching-item p { margin:0; color:var(--text); line-height:1.55; }
.source-links { margin-top: 14px; border-top: 1px solid var(--line); padding-top: 12px; }
.source-link-list { display:flex; flex-wrap:wrap; gap: 8px; margin-top: 8px; }
.source-chip { display:inline-flex; align-items:center; min-height: 34px; max-width: 100%; border-radius: 999px; border: 1px solid var(--line); padding: 7px 10px; color: var(--primary); background: var(--panel); font-size: .86rem; font-weight: 850; text-decoration: none; overflow-wrap: anywhere; }
.source-chip:hover { border-color: rgba(37,99,235,.42); background: rgba(37,99,235,.08); }
.source-detail-list { display: grid; gap: 10px; margin-top: 12px; }
.source-detail { border: 1px solid var(--line); border-radius: 14px; padding: 11px 12px; background: color-mix(in srgb, var(--panel-strong) 76%, transparent); }
.source-detail div { display: grid; gap: 3px; }
.source-detail span { color: var(--muted); font-size: .82rem; overflow-wrap: anywhere; }
.source-detail blockquote { margin: 9px 0 0; padding-left: 12px; border-left: 3px solid var(--primary); color: var(--text); font-style: italic; line-height: 1.5; }
.card-actions { display:flex; flex-wrap:wrap; gap: 10px; margin-top: 18px; }
.maintenance-note-box {
  margin-top: 14px;
  display: grid;
  gap: 7px;
  max-width: min(980px, 100%);
}
.maintenance-note-box label {
  color: var(--muted);
  font-size: .82rem;
  font-weight: 950;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.maintenance-note-box textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-strong);
  color: var(--text);
  padding: 12px 13px;
  resize: vertical;
  outline: none;
}
.maintenance-note-box textarea:focus {
  border-color: var(--bad);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--bad) 15%, transparent);
}
.report-box {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  display: grid;
  gap: 10px;
  background: color-mix(in srgb, var(--panel-strong) 82%, transparent);
}
.report-box label {
  font-weight: 900;
  color: var(--muted);
  font-size: .9rem;
}
.report-box textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  background: var(--panel-strong);
  padding: 11px 12px;
}
.report-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.course-complete-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  border: 1px solid rgba(22,163,74,.34);
  border-radius: 18px;
  padding: 12px 14px;
  background: var(--good-bg);
}
.course-complete-box strong { color: var(--good); }
.course-complete-box span { color: var(--muted); font-weight: 850; }
.chip-btn { border: 1px solid var(--line); background: var(--panel-strong); color: var(--text); border-radius: 999px; padding: 10px 13px; font-weight: 850; font-size: .94rem; }
.chip-btn.active { color: #fff; background: #f59e0b; border-color: #f59e0b; }
.chip-btn.maintenance-active { color:#fff; background:var(--bad); border-color:var(--bad); }
.chip-btn.ai-explain-btn { color: var(--primary); border-color: color-mix(in srgb, var(--primary) 35%, var(--line)); }
.chip-btn.anki-grade { min-width: 78px; }
.chip-btn.bad-grade { color: var(--bad); background: var(--bad-bg); border-color: rgba(220,38,38,.32); }
.chip-btn.good-grade { color: var(--good); background: var(--good-bg); border-color: rgba(22,163,74,.32); }
.chip-btn.anki-grade.active { color: #fff; background: var(--primary); border-color: var(--primary); }
.chip-btn.anki-grade.bad-grade.active { background: var(--bad); border-color: var(--bad); }
.chip-btn.anki-grade.good-grade.active { background: var(--good); border-color: var(--good); }
.ai-quota-btn { color: var(--primary); }
.ai-explain-box {
  margin-top: 18px;
  border: 1px solid color-mix(in srgb, var(--primary) 28%, var(--line));
  border-radius: 18px;
  padding: 16px;
  background: color-mix(in srgb, var(--panel-strong) 86%, rgba(37,99,235,.08));
  max-width: 1200px;
}
.ai-explain-box[hidden] { display: none; }
.ai-explain-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  color: var(--text);
  margin-bottom: 10px;
}
.ai-explain-head span { color: var(--muted); font-size: .86rem; font-weight: 850; }
.ai-answer { font-family: var(--reading-font); line-height: 1.62; }
.ai-answer p { margin: 8px 0; color: var(--text); }
.ai-answer h4 { margin: 14px 0 8px; font-size: 1.05rem; }
.ai-source-list { display: grid; gap: 9px; margin-top: 14px; border-top: 1px solid var(--line); padding-top: 12px; }
.ai-source-list a {
  display: grid;
  gap: 4px;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 10px 11px;
  background: var(--panel);
}
.ai-source-list span { color: var(--muted); font-size: .86rem; line-height: 1.45; }
.right-rail { display: grid; gap: 16px; position: sticky; top: 106px; }
.focus-nav {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  gap: 10px;
  z-index: 80;
}
.focus-arrow {
  width: 58px;
  height: 58px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  box-shadow: var(--small-shadow);
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
}
.focus-hud {
  position: fixed;
  left: max(18px, env(safe-area-inset-left));
  top: max(18px, env(safe-area-inset-top));
  display: none;
  gap: 12px;
  align-items: center;
  z-index: 82;
}
.focus-ring {
  --ring-value: 0%;
  --ring-color: var(--primary);
  width: 86px;
  height: 86px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: conic-gradient(var(--ring-color) var(--ring-value), rgba(148,163,184,.20) 0);
  box-shadow: var(--small-shadow);
}
.focus-ring > div {
  width: 68px;
  height: 68px;
  border-radius: 999px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  align-content: center;
}
.focus-ring strong { font-size: 1.02rem; line-height: 1; letter-spacing: 0; }
.focus-ring span { color: var(--muted); font-size: .68rem; font-weight: 900; text-transform: uppercase; line-height: 1; margin-top: 5px; }
.focus-controls {
  display: flex;
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  box-shadow: var(--small-shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.focus-control-btn {
  min-width: 48px;
  height: 48px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  font-weight: 950;
  padding: 0 13px;
  line-height: 1;
}
.focus-control-btn.exit {
  min-width: 66px;
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}
body.focus-mode {
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  overflow-y: auto;
}
body.focus-mode .app-shell {
  display: block;
  min-height: 100vh;
  padding: 0;
}
body.focus-mode .sidebar,
body.focus-mode .topbar,
body.focus-mode .hero-grid,
body.focus-mode .right-rail { display: none !important; }
body.focus-mode .study-layout { display: block; }
body.focus-mode .question-card {
  width: 100vw;
  max-width: none;
  min-height: 100vh;
  border-radius: 0;
  border: 0;
  padding: 132px clamp(34px, 7vw, 120px) clamp(32px, 5vh, 64px);
  overflow: visible;
}
body.focus-mode .focus-nav { display: grid; }
body.focus-mode .focus-hud {
  display: flex;
}
body.focus-mode .focus-controls {
  display: flex;
  border-radius: 999px;
}
body.focus-mode .q-title {
  max-width: min(1500px, 100%);
  font-size: clamp(1.6rem, 1.35vw + 1.05rem, 2.45rem);
}
body.focus-mode .option-btn,
body.focus-mode .short-answer-card,
body.focus-mode .feedback,
body.focus-mode .ai-explain-box { max-width: min(1500px, 100%); }
body.focus-mode .option-text { font-size: clamp(1.05rem, .55vw + .95rem, 1.32rem); }
body.focus-mode .feedback,
body.focus-mode .explanation,
body.focus-mode .ai-answer { font-size: clamp(1rem, .38vw + .94rem, 1.18rem); }
body.summary-focus-mode {
  background: var(--bg);
  overflow-x: hidden;
}
body.summary-focus-mode .summary-view {
  min-height: 100vh;
  padding: max(8px, env(safe-area-inset-top)) clamp(10px, 3vw, 34px) 28px;
}
body.summary-focus-mode .summary-view .notes-topbar,
body.summary-focus-mode .summary-toolbar,
body.summary-focus-mode .summary-group-head {
  display: none;
}
body.summary-focus-mode .summary-shell {
  width: min(1040px, 100%);
  gap: 12px;
}
body.summary-focus-mode .summary-focus-bar {
  display: flex;
}
body.summary-focus-mode .summary-content {
  padding-top: 8px;
}
body.summary-focus-mode .summary-grid {
  max-width: 100%;
}
body.summary-focus-mode .summary-card {
  padding: clamp(18px, 2.6vw, 28px);
}
body.summary-focus-mode .summary-card h2 {
  font-size: clamp(1.18rem, .75vw + 1.08rem, 1.65rem);
}
.mini-card { border-radius: var(--radius-lg); padding: 16px; }
.rail-title { font-weight: 950; margin-bottom: 12px; }
.analytics-panel { display: grid; gap: 14px; }
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.analytics-grid > div {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 8px;
  background: var(--panel-strong);
  display: grid;
  gap: 3px;
  min-width: 0;
}
.analytics-grid.all-bank-grid > div {
  background: color-mix(in srgb, var(--primary) 10%, var(--panel-strong));
  border-color: color-mix(in srgb, var(--primary) 28%, var(--line));
}
.analytics-grid strong {
  font-size: 1.04rem;
  line-height: 1;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}
.analytics-grid span,
.analytics-label,
.analytics-empty {
  color: var(--muted);
  font-size: .78rem;
  font-weight: 850;
  line-height: 1.35;
}
.analytics-section { display: grid; gap: 8px; }
.trend-chart {
  height: 92px;
  display: grid;
  grid-template-columns: repeat(14, minmax(0, 1fr));
  gap: 4px;
  align-items: end;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 8px 6px;
  background: var(--panel-strong);
}
.trend-bar {
  min-width: 0;
  height: 100%;
  display: grid;
  grid-template-rows: 1fr auto;
  align-items: end;
  gap: 4px;
}
.trend-bar div {
  width: 100%;
  min-height: 4px;
  border-radius: 7px 7px 3px 3px;
  background: linear-gradient(180deg, var(--primary), var(--good));
}
.trend-bar span {
  color: var(--muted);
  font-size: .58rem;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
}
.weak-topic-list { display: grid; gap: 8px; }
.weak-topic-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 68px 40px;
  gap: 8px;
  align-items: center;
}
.weak-topic-row strong {
  display: block;
  font-size: .84rem;
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.weak-topic-row span { color: var(--muted); font-size: .74rem; font-weight: 800; }
.weak-topic-row b { font-size: .8rem; text-align: right; }
.weak-meter {
  height: 9px;
  border-radius: 999px;
  background: rgba(148,163,184,.20);
  overflow: hidden;
}
.weak-meter div {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--bad), var(--warn), var(--good));
}
.nav-row { display:grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.nav-btn { font-weight: 850; font-size: 1rem; }
.position-label { margin-top: 12px; color: var(--muted); font-weight: 800; font-size: .9rem; }
.stacked-actions { display: grid; gap: 9px; }
.full-btn { width: 100%; font-weight: 850; text-align: center; font-size: 1rem; }
.note-box { width:100%; min-height: 150px; resize: vertical; border-radius: 16px; border: 1px solid var(--line); padding: 14px; color: var(--text); background: var(--panel-strong); outline: none; font-size: 1rem; line-height: 1.55; }
.note-status { margin-top: 8px; color: var(--muted); font-size: .8rem; font-weight: 800; }
.empty-state { min-height: 430px; display:grid; place-items:center; align-content:center; text-align:center; gap: 10px; }
.loader { width: 36px; height:36px; border-radius:50%; border: 4px solid rgba(148,163,184,.25); border-top-color: var(--primary); animation: spin 1s linear infinite; }
.dialog { border:0; background: transparent; padding: 20px; max-width: 880px; width: min(94vw, 880px); }
.dialog::backdrop { background: rgba(2,6,23,.42); backdrop-filter: blur(8px); }
.dialog-card { border-radius: var(--radius-xl); padding: 22px; }
.dialog-header { display:flex; justify-content:space-between; align-items:center; gap: 12px; }
.dialog-header h2 { margin: 0; font-size: 1.6rem; }
.dialog-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 16px; }
.dialog-actions { display:grid; gap: 9px; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(100px); opacity: 0; z-index: 99; background: var(--panel-strong); color: var(--text); border: 1px solid var(--line); border-radius: 999px; padding: 12px 16px; box-shadow: var(--shadow); font-weight: 850; transition: all .22s ease; }
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pop { from { transform: scale(.985); opacity: .3; } to { transform: scale(1); opacity: 1; } }

@media (max-width: 1050px) {
  .study-mode-dock {
    top: max(8px, env(safe-area-inset-top));
    bottom: auto;
  }
  .app-shell { grid-template-columns: 1fr; padding: 12px; }
  .sidebar { position: fixed; inset: 12px auto 12px 12px; width: min(88vw, 330px); height: auto; transform: translateX(calc(-100% - 20px)); transition: transform .18s ease; }
  .sidebar.open { transform: translateX(0); }
  .mobile-only { display: grid; }
  .topbar { top: 12px; }
  .hero-grid { grid-template-columns: 1fr; }
  .study-layout { grid-template-columns: 1fr; }
  .right-rail { position: static; grid-template-columns: 1fr 1fr; }
  .summary-toolbar { grid-template-columns: 1fr; }
  .knowledge-toolbar,
  .knowledge-layout {
    grid-template-columns: 1fr;
  }
  .knowledge-rail {
    position: static;
    max-height: 280px;
  }
  .knowledge-slide-list {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
  .notes-card { grid-column: 1 / -1; }
  body.focus-mode .question-card {
    padding: 128px clamp(24px, 6vw, 64px) 34px;
  }
  body.focus-mode .focus-hud {
    display: flex;
    top: max(12px, env(safe-area-inset-top));
    left: max(12px, env(safe-area-inset-left));
    transform: none;
  }
  body.focus-mode .focus-controls {
    display: flex;
    border-radius: 999px;
  }
}
@media (max-width: 900px), (pointer: coarse) {
  .topbar-actions { gap: 7px; }
  .soft-btn { min-height: 44px; padding: 10px 11px; }
  .option-btn { min-height: 76px; }
  .sidebar { padding-bottom: max(18px, env(safe-area-inset-bottom)); }
}
@media (max-width: 700px) {
  html { font-size: 16px; }

  .topbar { flex-wrap: wrap; }
  .search-wrap { order: 2; flex-basis: 100%; }
  .topbar-actions { flex: 1; justify-content: flex-end; }
  .hero-card { flex-direction: column; }
  .hero-stats { min-width: 0; }
  .right-rail { grid-template-columns: 1fr; }
  .dialog-grid { grid-template-columns: 1fr; }
  .question-card { padding: 22px; }
  .option-btn { grid-template-columns: 44px 1fr; padding: 16px; }
  .option-status { grid-column: 2; }
  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-stats strong { font-size: 1.25rem; }
  .topbar-actions { width: 100%; justify-content: space-between; overflow-x: auto; padding-bottom: 2px; }
  .topbar-actions .soft-btn { flex: 0 0 auto; }
  .summary-view { padding: 8px; }
  .summary-grid { grid-template-columns: 1fr; }
  .summary-card { padding: 15px; }
  .summary-study-actions { justify-content: stretch; }
  .summary-study-actions .soft-btn { flex: 1 1 auto; }
  .summary-detail summary {
    align-items: stretch;
    flex-direction: column;
  }
  .summary-detail summary .soft-btn {
    width: 100%;
    justify-content: center;
  }
  .summary-table { min-width: 390px; }
  .knowledge-view { padding: 6px; }
  .knowledge-toolbar {
    gap: 10px;
    padding: 12px;
  }
  .knowledge-controls {
    grid-template-columns: 1fr;
  }
  .knowledge-deck-picker {
    min-height: 44px;
  }
  .knowledge-deck-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .knowledge-rail {
    max-height: 220px;
    padding: 10px;
  }
  .knowledge-slide-list {
    grid-template-columns: 1fr;
  }
  .knowledge-card {
    min-height: auto;
    padding: 16px;
    border-radius: 16px;
  }
  .knowledge-card-head h2 {
    font-size: 1.5rem;
  }
  .knowledge-image-grid {
    grid-template-columns: 1fr;
  }
  .knowledge-answer .level-1,
  .knowledge-notes-body .level-1 { margin-left: .6rem; }
  .knowledge-answer .level-2,
  .knowledge-notes-body .level-2 { margin-left: 1.1rem; }
  .knowledge-answer .level-3,
  .knowledge-notes-body .level-3 { margin-left: 1.6rem; }
  .knowledge-nav {
    grid-template-columns: 1fr auto 1fr;
  }
  .knowledge-nav .nav-btn {
    min-height: 42px;
    padding: 8px 10px;
    font-size: .9rem;
  }
  body.knowledge-focus-mode .knowledge-card {
    padding: 16px 12px 88px;
  }
  body.knowledge-focus-mode .knowledge-nav {
    left: max(8px, env(safe-area-inset-left));
    right: max(8px, env(safe-area-inset-right));
    justify-content: stretch;
  }
  .summary-group-head { align-items: start; }
  body.summary-focus-mode .summary-view { padding: 6px; }
  body.summary-focus-mode .summary-focus-bar {
    justify-self: stretch;
    justify-content: flex-end;
    overflow-x: auto;
  }
  body.focus-mode .question-card { padding: 112px 14px 34px; }
  body.focus-mode .q-title { font-size: 1.42rem; line-height: 1.42; }
  body.focus-mode .focus-nav {
    right: max(10px, env(safe-area-inset-right));
    top: auto;
    bottom: max(14px, env(safe-area-inset-bottom));
    transform: none;
    grid-template-columns: 1fr 1fr;
  }
  body.focus-mode .focus-arrow { width: 54px; height: 54px; font-size: 1.8rem; }
  .focus-hud { left: max(8px, env(safe-area-inset-left)); top: max(8px, env(safe-area-inset-top)); gap: 6px; }
  .focus-ring { width: 52px; height: 52px; }
  .focus-ring > div { width: 42px; height: 42px; }
  .focus-ring strong { font-size: .74rem; }
  .focus-ring span { font-size: .48rem; margin-top: 3px; }
  .focus-controls {
    position: fixed;
    right: max(10px, env(safe-area-inset-right));
    top: max(8px, env(safe-area-inset-top));
    gap: 6px;
    padding: 6px;
  }
  .focus-control-btn {
    min-width: 38px;
    height: 38px;
    padding: 0 10px;
    font-size: .86rem;
  }
  .focus-control-btn.exit { min-width: 54px; }
}

@media (max-width: 700px) {
  .notes-view { padding: 6px; }
  .notes-topbar {
    display: flex;
    position: sticky;
    top: 6px;
    min-height: 56px;
    padding: 8px;
  }
  .notes-topbar > div:first-child { display: none; }
  .physical-view .notes-actions { gap: 6px; align-items: stretch; }
  .physical-view .notes-actions .soft-btn,
  .physical-view .notes-actions .notes-open-link { min-height: 40px; padding: 8px 10px; font-size: .86rem; }
  .notes-actions {
    width: 100%;
    justify-content: stretch;
  }
  .notes-actions > * {
    flex: 1;
    justify-content: center;
  }
  .sota-frame {
    height: calc(100svh - 78px);
    min-height: 520px;
    border-radius: 14px;
  }
  .physical-frame {
    height: calc(100svh - 62px);
    min-height: 520px;
    border-radius: 14px;
  }
  .physical-module-picker {
    flex: 2 1 190px;
    min-width: 0;
    min-height: 40px;
    padding: 5px 8px;
  }
  .physical-module-picker span { display: none; }
  .physical-module-picker select {
    width: 100%;
    min-width: 0;
    font-size: .9rem;
  }

  body.notes-mode {
    min-height: 100svh;
    overflow: hidden;
  }

  body.summary-mode {
    overflow: auto;
  }

  body.knowledge-mode {
    overflow: auto;
  }

  #notesView.notes-view {
    min-height: 0;
    height: 100svh;
    padding: 0;
  }

  #notesView .notes-topbar {
    display: none;
  }

  #notesView .sota-frame {
    display: block;
    width: 100%;
    height: 100svh;
    min-height: 0;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
}

@media (min-width: 701px) and (max-width: 1180px) {
  .notes-view { padding: 8px; }
  .sota-frame { height: calc(100vh - 96px); min-height: 720px; }
  .physical-frame { height: calc(100vh - 76px); min-height: 720px; }
}
html[data-device="ipad"] .app-shell { padding-inline: max(14px, env(safe-area-inset-left)) max(14px, env(safe-area-inset-right)); }
html[data-device="iphone"] .app-shell { padding: 10px max(10px, env(safe-area-inset-right)) max(14px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left)); }
html[data-device="iphone"] .brand-subtitle,
html[data-device="iphone"] .eyebrow { letter-spacing: 0; }
html[data-device="iphone"] .bank-actions { flex-direction: column; }
html[data-browser="safari"][data-os="ios"] body.focus-mode { min-height: -webkit-fill-available; }

@supports (-webkit-touch-callout: none) {
  .glass-card,
  .focus-controls,
  .dialog::backdrop {
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
  }

  body {
    background: linear-gradient(135deg, var(--bg), var(--bg2)) !important;
  }

  .question-card {
    contain: layout;
  }

  .question-image {
    contain: none;
    isolation: auto;
  }

  .question-image img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 72svh;
    object-fit: contain;
    background: transparent;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }

  .sota-frame {
    backface-visibility: visible;
    -webkit-backface-visibility: visible;
  }

  .focus-ring {
    will-change: auto;
  }

  button:hover {
    transform: none;
    box-shadow: none;
  }
}

@media (hover: hover) and (pointer: fine) {
  button:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 16px rgba(30,41,59,.08);
  }
}

@media (min-width: 1200px) {
  .question-card { max-width: 1040px; }
}

@media print {
  body { background: white; }
  .sidebar, .topbar, .right-rail, .hero-grid, .toast { display:none !important; }
  .app-shell, .study-layout { display:block; padding:0; }
  .question-card { box-shadow:none; border:0; }
}