:root {
  --bg: #f8fafc;
  --panel: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --line: #e2e8f0;
  --primary: #4f46e5;
  --primary-light: #6366f1;
  --success: #10b981;
  --success-light: #34d399;
  --error: #ef4444;
  --warning: #f59e0b;
  --shadow: 0 4px 20px rgba(79, 70, 229, 0.08);
  --shadow-hover: 0 8px 30px rgba(79, 70, 229, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
}

button, select, input, textarea { font: inherit; }

button, select, input, textarea {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 8px;
  transition: all 0.2s ease;
}

button {
  height: 36px;
  padding: 0 14px;
  cursor: pointer;
  font-weight: 500;
}

button:hover { border-color: var(--primary); }
button.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
button.primary:hover { background: var(--primary-light); border-color: var(--primary-light); }
button.danger { color: var(--error); border-color: rgba(239, 68, 68, 0.2); background: rgba(239, 68, 68, 0.05); }
button.danger:hover { background: rgba(239, 68, 68, 0.1); }
button.active { outline: 2px solid rgba(79, 70, 229, 0.25); border-color: var(--primary); }
button:disabled { cursor: not-allowed; opacity: 0.5; }

.app { max-width: 1600px; margin: 0 auto; padding: 20px; }

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  margin-bottom: 16px;
}

h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }

.top-right {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.auth-strip {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  min-height: 36px;
}

.auth-strip span {
  color: var(--muted);
  font-size: 13px;
}

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(30, 41, 59, 0.4);
  backdrop-filter: blur(4px);
}

.auth-card {
  width: min(420px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(79, 70, 229, 0.15);
  overflow: hidden;
}

.auth-body {
  display: grid;
  gap: 12px;
  padding: 20px;
}

.auth-body label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.auth-body input {
  height: 42px;
  padding: 0 12px;
}

.auth-body input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.auth-message {
  min-height: 22px;
  color: var(--muted);
  font-size: 13px;
}

.auth-message.error { color: var(--error); }
.auth-actions { display: flex; justify-content: flex-end; gap: 10px; }

.stats {
  display: grid;
  grid-template-columns: repeat(5, minmax(60px, 1fr));
  gap: 10px;
  min-width: 450px;
}

.stats div {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  text-align: center;
}

.stats b {
  display: block;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
}

.stats span { color: var(--muted); font-size: 12px; }

.layout {
  display: grid;
  grid-template-columns: minmax(600px, 1fr) minmax(480px, 560px);
  gap: 16px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.controls {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(150px, 1fr) minmax(140px, 1fr) minmax(350px, 1.5fr) minmax(220px, 1fr) minmax(140px, 1fr) minmax(140px, 1fr) auto;
  gap: 12px;
  align-items: end;
  padding: 14px 16px;
}

.controls label { display: block; color: var(--muted); margin-bottom: 4px; font-size: 13px; }
.controls select {
  width: 100%;
  height: 36px;
  margin-top: 4px;
  padding: 0 10px;
}

.controls select:focus {
  outline: none;
  border-color: var(--primary);
}

.button-grid { display: grid; grid-template-columns: repeat(5, minmax(70px, 1fr)); gap: 8px; margin: 0; }
.button-grid button { border-radius: 8px; }

.toggles {
  display: flex;
  gap: 12px;
  align-items: center;
  min-height: 36px;
}

.toggles label { color: var(--text); margin: 0; white-space: nowrap; font-size: 14px; }

.choice-mode { padding: 0; }

.meter { margin: 0; min-width: 140px; }
.meter-row { display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; margin-bottom: 8px; }
.bar { height: 8px; background: #f1f5f9; border-radius: 999px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--primary), var(--primary-light)); border-radius: 999px; }

.wrong-history-panel {
  grid-column: 1 / -1;
  overflow: hidden;
}

.wrong-history-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  max-height: 200px;
  overflow: auto;
  padding: 12px 16px;
}

body.view-wrongbook .wrong-history-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  max-height: calc(100vh - 280px);
}

.wrong-empty {
  grid-column: 1 / -1;
  color: var(--muted);
  background: #f8fafc;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}

.wrong-card {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "main counts"
    "last answer"
    "trail trail";
  gap: 8px 10px;
  min-height: 90px;
  height: auto;
  padding: 12px;
  text-align: left;
  border-color: rgba(239, 68, 68, 0.15);
  background: #fff5f5;
  border-radius: 10px;
  transition: all 0.2s ease;
}

.wrong-card:hover {
  border-color: rgba(239, 68, 68, 0.4);
  background: #fff1f1;
  transform: translateY(-2px);
}

body.view-wrongbook .wrong-card {
  min-height: 120px;
}

.wrong-main { grid-area: main; min-width: 0; }
.wrong-main b {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
}

.wrong-main em {
  display: block;
  margin-top: 4px;
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wrong-counts {
  grid-area: counts;
  display: flex;
  gap: 4px;
  align-items: start;
}

.wrong-counts i {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  background: #fee2e2;
  color: var(--error);
  font-size: 12px;
  font-style: normal;
}

.wrong-last {
  grid-area: last;
  color: var(--muted);
  font-size: 12px;
}

.wrong-answer {
  grid-area: answer;
  max-width: 180px;
  overflow: hidden;
  color: var(--warning);
  font-size: 12px;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wrong-trail {
  grid-area: trail;
  display: flex;
  gap: 4px;
  overflow: hidden;
}

.wrong-trail i {
  min-width: 0;
  padding: 3px 8px;
  border-radius: 999px;
  background: #f1f5f9;
  color: var(--muted);
  font-size: 11px;
  font-style: normal;
  white-space: nowrap;
}

.wrong-trail i.bad { background: #fee2e2; color: var(--error); }
.wrong-trail i.show { background: #fef3c7; color: var(--warning); }
.wrong-trail i.ok { background: #d1fae5; color: var(--success); }

.wrong-visual {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(320px, .9fr) minmax(260px, 1fr) minmax(260px, 1fr);
  gap: 12px;
  margin-bottom: 4px;
}

.wrong-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.wrong-metrics span,
.wrong-bars {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fafc;
  padding: 12px;
}

.wrong-metrics b {
  display: block;
  font-size: 26px;
  line-height: 1;
}

.wrong-metrics em {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.wrong-bars > b {
  display: block;
  margin-bottom: 10px;
}

.wrong-bar-row {
  display: grid;
  grid-template-columns: minmax(80px, 120px) 1fr 32px;
  gap: 10px;
  align-items: center;
  margin: 8px 0;
  color: var(--muted);
  font-size: 13px;
}

.wrong-bar-row em {
  overflow: hidden;
  font-style: normal;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wrong-bar-row i {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #e2e8f0;
}

.wrong-bar-row strong {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--error);
}

.wrong-bar-row b {
  color: var(--text);
  text-align: right;
}

.wrong-section-title {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.quiz { min-height: 580px; padding: 20px; }
.quiz-head, .actions, .panel-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(139, 92, 246, 0.1));
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
}

.badge.muted { background: #f1f5f9; color: var(--muted); }
.position { color: var(--muted); font-size: 14px; }

.question {
  margin: 20px 0;
  padding: 16px;
  background: linear-gradient(135deg, #f8fafc, #f0fdf4);
  border: 1px solid var(--line);
  border-radius: 12px;
  white-space: pre-wrap;
  min-height: 140px;
  font-size: 16px;
  line-height: 1.7;
}

.answer-area { display: grid; gap: 10px; }

.option {
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.option:hover {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.03);
  transform: translateX(4px);
}

.option input {
  margin-top: 0;
  width: 20px;
  height: 20px;
}

.option.correct {
  border-color: var(--success);
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);
}

.option.wrong {
  border-color: var(--error);
  background: linear-gradient(135deg, #fef2f2, #fee2e2);
}

textarea {
  width: 100%;
  min-height: 120px;
  padding: 14px;
  resize: vertical;
  font-family: "Consolas", "Cascadia Mono", monospace;
  font-size: 15px;
}

textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.actions { margin-top: 16px; justify-content: flex-end; flex-wrap: wrap; gap: 8px; }
.actions button { min-width: 80px; border-radius: 8px; }

#favoriteBtn {
  position: relative;
}

#favoriteBtn.active {
  border-color: #f59e0b;
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  color: #92400e;
}

.result {
  margin-top: 16px;
  border-radius: 12px;
  border: 2px solid var(--line);
  padding: 16px;
  white-space: pre-wrap;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-title {
  font-weight: 700;
  margin-bottom: 12px;
  font-size: 16px;
}

.result-block {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(100, 116, 139, 0.15);
}

.result-block b {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
}

.result pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font: inherit;
}

.result .analysis pre {
  color: var(--text);
}

.analysis-ai {
  margin-top: 12px;
  height: 36px;
}

.result.ok {
  border-color: rgba(16, 185, 129, 0.4);
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);
  color: var(--success);
}

.result.bad {
  border-color: rgba(239, 68, 68, 0.35);
  background: linear-gradient(135deg, #fef2f2, #fee2e2);
  color: var(--error);
}

.result.show {
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  color: var(--warning);
}

.hidden { display: none !important; }

body.auth-required .layout,
body.auth-required .stats,
body.auth-required #loginOpenBtn {
  display: none;
}

body.auth-required .topbar {
  align-items: center;
}

body.auth-required .auth-modal {
  background: rgba(248, 250, 252, 0.98);
}

body.view-practice .wrong-history-panel {
  display: none;
}

body.view-wrongbook .quiz,
body.view-wrongbook .side-stack {
  display: none;
}

.side-stack {
  display: grid;
  gap: 16px;
  position: sticky;
  top: 16px;
  align-self: start;
}

.panel-head { padding: 12px 16px; border-bottom: 1px solid var(--line); }
.panel-head span { color: var(--muted); font-size: 13px; }

.ai-panel { overflow: hidden; }
.ai-config {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: #f8fafc;
}

.ai-config label { display: grid; gap: 4px; color: var(--muted); font-size: 12px; }
.ai-config input { height: 36px; padding: 0 10px; }
.hint { font-size: 12px; line-height: 1.5; color: var(--muted); }

.mini-actions, .ai-actions, .ai-quick {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.ai-messages {
  height: min(45vh, 450px);
  min-height: 340px;
  overflow: auto;
  padding: 12px 16px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.ai-empty {
  color: var(--muted);
  background: #f1f5f9;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}

.msg {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  transition: all 0.2s ease;
}

.msg.user { background: linear-gradient(135deg, #eff6ff, #dbeafe); }
.msg.ai { background: #f8fafc; }
.msg.error { background: #fef2f2; border-color: rgba(239, 68, 68, 0.3); color: var(--error); }
.msg b { display: block; margin-bottom: 6px; }
.msg-content {
  display: grid;
  gap: 8px;
}

.msg-content p,
.msg-content h4,
.msg-content ul {
  margin: 0;
}

.msg-content h4 {
  color: var(--text);
  font-size: 14px;
  line-height: 1.4;
  padding-top: 2px;
}

.msg-content ul {
  padding-left: 20px;
}

.msg-content li {
  margin: 4px 0;
}

.msg-content code {
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(79, 70, 229, 0.1);
  font-family: "Consolas", "Cascadia Mono", monospace;
}

.msg-content strong {
  font-weight: 600;
  color: var(--text);
}

.msg-content pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg-content .ai-code {
  padding: 10px;
  overflow: auto;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #f1f5f9;
  color: #1e293b;
}

.msg.user .msg-content pre {
  max-height: 120px;
  overflow: auto;
  color: var(--muted);
  font: 13px/1.5 "Consolas", "Cascadia Mono", monospace;
}

.ai-quick { padding: 0 16px 12px; }
.ai-quick button { height: 32px; font-size: 13px; }

.ai-input { margin: 0 16px; width: calc(100% - 32px); min-height: 100px; }
.ai-actions { justify-content: flex-end; padding: 12px 16px 16px; }

.list-panel { max-height: calc(100vh - 680px); overflow: hidden; }
.question-list { max-height: calc(100vh - 730px); min-height: 160px; overflow: auto; }

.qitem {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  gap: 10px;
  align-items: center;
  width: 100%;
  min-height: 44px;
  border: 0;
  border-bottom: 1px solid #f1f5f9;
  border-radius: 0;
  text-align: left;
  padding: 10px 14px;
  transition: all 0.2s ease;
}

.qitem:hover { background: #f8fafc; }
.qitem.current { background: linear-gradient(135deg, #eff6ff, #dbeafe); }
.qitem .tiny { color: var(--muted); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mark { font-size: 13px; color: var(--muted); }
.mark.ok { color: var(--success); }
.mark.bad { color: var(--error); }

@keyframes celebrate {
  0% { transform: scale(1); opacity: 1; }
  25% { transform: scale(1.1); }
  50% { transform: scale(0.95); }
  75% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes floatUp {
  0% { transform: translateY(0) scale(1); opacity: 1; }
  100% { transform: translateY(-100px) scale(1.5); opacity: 0; }
}

.celebration {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 100;
  pointer-events: none;
}

.celebration-text {
  font-size: 36px;
  font-weight: 800;
  background: linear-gradient(135deg, #10b981, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: celebrate 0.8s ease;
}

.celebration-text.error {
  background: linear-gradient(135deg, #ef4444, #f97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.confetti {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  animation: floatUp 1.5s ease-out forwards;
}

.confetti:nth-child(2) { left: -30px; background: #4f46e5; animation-delay: 0.1s; }
.confetti:nth-child(3) { left: 30px; background: #10b981; animation-delay: 0.2s; }
.confetti:nth-child(4) { left: -50px; background: #f59e0b; animation-delay: 0.3s; }
.confetti:nth-child(5) { left: 50px; background: #ef4444; animation-delay: 0.15s; }
.confetti:nth-child(6) { left: -70px; background: #8b5cf6; animation-delay: 0.25s; }
.confetti:nth-child(7) { left: 70px; background: #06b6d4; animation-delay: 0.35s; }

.msg-content h3,
.msg-content h4,
.msg-content h5 {
  margin: 12px 0 8px;
  padding: 0;
  font-weight: 600;
  color: #4f46e5;
}

.msg-content h3 { font-size: 18px; }
.msg-content h4 { font-size: 16px; }
.msg-content h5 { font-size: 14px; }

.msg-content .math {
  font-family: "Times New Roman", serif;
  font-style: italic;
  color: #1f2937;
  padding: 0 4px;
}

.msg-content .math-block {
  display: block;
  font-family: "Times New Roman", serif;
  font-style: italic;
  color: #1f2937;
  padding: 8px 12px;
  background: #f3f4f6;
  border-radius: 6px;
  margin: 8px 0;
  text-align: center;
}

.msg-content p {
  margin: 6px 0;
  line-height: 1.6;
}

.msg-content ul {
  margin: 8px 0;
  padding-left: 24px;
}

.msg-content li {
  margin: 4px 0;
}

@media (max-width: 1180px) {
  .layout { grid-template-columns: 1fr; }
  .controls {
    grid-template-columns: repeat(2, minmax(180px, 1fr));
  }
  .button-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .side-stack { position: static; grid-template-columns: minmax(420px, 1.25fr) minmax(320px, .85fr); }
  .ai-messages { height: 360px; min-height: 280px; }
  .list-panel, .question-list { max-height: none; }
  .question-list { max-height: 360px; }
  .wrong-history-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  body.view-wrongbook .wrong-history-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wrong-visual { grid-template-columns: 1fr 1fr; }
  .wrong-metrics { grid-column: 1 / -1; grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 820px) {
  body { font-size: 16px; }

  .app {
    padding: 12px;
    padding-bottom: 100px;
  }

  .topbar {
    display: block;
    margin-bottom: 12px;
  }

  h1 { font-size: 22px; }
  p { font-size: 13px; }

  .top-right {
    justify-items: stretch;
    margin-top: 10px;
  }

  .auth-strip {
    justify-content: space-between;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 8px;
  }

  .auth-strip button {
    height: 36px;
  }

  .stats {
    min-width: 0;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }

  .stats div {
    padding: 10px 6px;
    text-align: center;
  }

  .stats b { font-size: 18px; }
  .stats span { font-size: 12px; }

  .layout, .side-stack { grid-template-columns: 1fr; }

  .controls {
    order: 1;
    position: static;
    grid-template-columns: 1fr;
    padding: 14px;
  }

  .quiz {
    order: 2;
    padding: 16px;
    min-height: auto;
  }

  .wrong-history-panel {
    order: 2;
  }

  .wrong-history-list {
    grid-template-columns: 1fr;
    max-height: 280px;
    padding: 10px;
  }

  body.view-wrongbook .wrong-history-list {
    grid-template-columns: 1fr;
    max-height: none;
  }

  .wrong-visual,
  .wrong-metrics {
    grid-template-columns: 1fr;
  }

  .wrong-metrics { grid-column: auto; }

  .wrong-card {
    min-height: 100px;
  }

  .side-stack {
    order: 4;
    gap: 12px;
  }

  .quiz-head {
    align-items: flex-start;
  }

  .badge {
    max-width: 100%;
    min-height: 30px;
    margin-bottom: 6px;
  }

  .badge.muted {
    display: block;
    width: fit-content;
    max-width: calc(100vw - 52px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .question {
    margin: 14px 0;
    padding: 14px;
    min-height: 120px;
    font-size: 17px;
    line-height: 1.7;
  }

  .answer-area {
    gap: 12px;
  }

  .option {
    grid-template-columns: 36px 1fr;
    gap: 12px;
    min-height: 60px;
    padding: 14px;
    border-radius: 10px;
    font-size: 16px;
    line-height: 1.5;
  }

  .option input {
    width: 22px;
    height: 22px;
    margin-top: 2px;
  }

  .answer-area:has(.option:nth-child(2):last-child) {
    grid-template-columns: 1fr 1fr;
  }

  .answer-area:has(.option:nth-child(2):last-child) .option {
    grid-template-columns: 30px 1fr;
    min-height: 70px;
    align-items: center;
  }

  textarea {
    min-height: 140px;
    font-size: 16px;
  }

  .actions {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 20;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin: 0;
    padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
    background: rgba(255, 255, 255, 0.98);
    border-top: 1px solid var(--line);
    box-shadow: 0 -8px 24px rgba(79, 70, 229, 0.08);
    backdrop-filter: blur(10px);
  }

  .actions button {
    min-width: 0;
    height: 44px;
    padding: 0 6px;
    font-size: 14px;
    border-radius: 10px;
  }

  .result {
    margin-top: 12px;
    font-size: 15px;
    max-height: 240px;
    overflow: auto;
  }

  .button-grid { grid-template-columns: repeat(3, 1fr); }

  .toggles {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .button-grid button,
  .controls select,
  .controls button {
    height: 42px;
  }

  .toggles label {
    min-height: 34px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .toggles input {
    width: 20px;
    height: 20px;
  }

  .ai-messages { height: 280px; min-height: 220px; }
  .msg { padding: 12px; }
  .msg-content h4 { font-size: 15px; }
  .ai-quick button { height: 36px; }
  .ai-actions button { height: 40px; }

  .list-panel { max-height: none; }
  .question-list {
    max-height: 280px;
    min-height: 140px;
  }

  .qitem {
    min-height: 50px;
    grid-template-columns: 34px 1fr minmax(40px, auto);
  }
}

@media (max-width: 420px) {
  .actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .actions button {
    font-size: 13px;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .answer-area:has(.option:nth-child(2):last-child) {
    grid-template-columns: 1fr 1fr;
  }
}