:root {
  --bg: #f6efe6;
  --bg-deep: #efe4d5;
  --ink: #1f1b16;
  --muted: #7a6b5f;
  --panel: #fff8ef;
  --panel-border: rgba(31, 27, 22, 0.1);
  --accent: #d36a4e;
  --accent-strong: #b24f38;
  --accent-cool: #2f7a6d;
  --shadow: 0 18px 40px rgba(27, 20, 15, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Futura", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 8% 0%, #f8efe1 0%, transparent 65%),
    radial-gradient(1000px 700px at 92% 12%, #ddebe4 0%, transparent 60%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-deep) 50%, var(--bg) 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(31, 27, 22, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 27, 22, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.35;
  z-index: -1;
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 24px 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--accent) 0%, var(--accent-cool) 100%);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.6);
}

.brand-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-subtitle {
  font-size: clamp(13px, 1.6vw, 16px);
  color: var(--muted);
}

.status-bar {
  display: flex;
  gap: 10px;
  align-items: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: clamp(12px, 1.5vw, 15px);
  font-weight: 600;
  letter-spacing: 0.3px;
  background: rgba(31, 27, 22, 0.08);
}

.pill.ok {
  background: rgba(47, 122, 109, 0.2);
  color: #165046;
}

.pill.warn {
  background: rgba(211, 106, 78, 0.2);
  color: #7a3a28;
}

.pill.error {
  background: rgba(170, 60, 50, 0.2);
  color: #7d2b25;
}

.pill.cloud {
  background: rgba(47, 122, 109, 0.16);
  color: #1d5d51;
}

.cloud-toggle {
  border: 0;
  cursor: pointer;
}

.cloud-toggle.off {
  background: rgba(211, 106, 78, 0.2);
  color: #7a3a28;
}

.pill.mode {
  background: rgba(31, 27, 22, 0.1);
}

.content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.panel {
  background: var(--panel);
  border-radius: 22px;
  padding: 22px;
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
}

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

.panel h2 {
  margin: 0;
  font-size: 18px;
}

.hint {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.import-panel {
  display: grid;
  gap: 16px;
  animation: rise 0.6s ease-out;
}

.quick-map {
  display: grid;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px dashed rgba(31, 27, 22, 0.18);
  background: rgba(255, 255, 255, 0.55);
}

.quick-map-head {
  display: grid;
  gap: 4px;
}

.quick-map-head strong {
  font-size: clamp(15px, 2vw, 20px);
}

.quick-map-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quick-map-note {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.import-panel textarea {
  min-height: 160px;
  border-radius: 16px;
  padding: 14px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  font-size: clamp(14px, 1.8vw, 18px);
  font-family: "Avenir Next", "Futura", "Trebuchet MS", "Segoe UI", sans-serif;
  resize: vertical;
  background: rgba(255, 255, 255, 0.7);
}

#source-text {
  min-height: 190px;
  border: 2px solid rgba(47, 122, 109, 0.34);
  background: #fff;
  box-shadow: 0 12px 28px rgba(47, 122, 109, 0.1);
}

#source-text:focus {
  outline: 3px solid rgba(47, 122, 109, 0.18);
  border-color: rgba(47, 122, 109, 0.78);
}

.hanzi-preview {
  display: grid;
  gap: 10px;
}

.hanzi-preview textarea {
  min-height: 110px;
  border-radius: 16px;
  padding: 14px;
  border: 1px dashed rgba(31, 27, 22, 0.18);
  font-size: clamp(16px, 2vw, 20px);
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  background: rgba(255, 255, 255, 0.75);
  resize: vertical;
}

.hanzi-preview-actions {
  display: flex;
  justify-content: flex-end;
}

.import-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}


.ocr-panel {
  display: grid;
  gap: 10px;
}

.voice-panel {
  display: grid;
  gap: 10px;
}

.voice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.video-panel {
  display: grid;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.video-actions,
.video-settings {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.video-actions input[type="url"] {
  flex: 1 1 360px;
  min-width: min(100%, 260px);
  border-radius: 999px;
  border: 1px solid rgba(31, 27, 22, 0.18);
  padding: 10px 14px;
  background: #fff;
  font-size: clamp(13px, 1.6vw, 16px);
}

.video-main-actions {
  align-items: stretch;
}

.video-main-actions .primary {
  min-width: 150px;
}

.video-status-main {
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(31, 27, 22, 0.08);
}

.video-advanced {
  display: grid;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.video-advanced > summary {
  cursor: pointer;
  font-weight: 700;
}

.video-advanced[open] > summary {
  margin-bottom: 10px;
}

.video-advanced[open] > * + * {
  margin-top: 10px;
}

.video-settings input[type="number"] {
  width: 96px;
  border-radius: 999px;
  border: 1px solid rgba(31, 27, 22, 0.18);
  padding: 6px 10px;
  background: #fff;
  font-size: clamp(12px, 1.6vw, 15px);
}

.video-audio-import {
  display: grid;
  gap: 10px;
  padding: 12px;
  border-radius: 12px;
  border: 1px dashed rgba(31, 27, 22, 0.16);
  background: rgba(255, 255, 255, 0.5);
}

.video-actions input[type="file"] {
  font-size: clamp(13px, 1.6vw, 16px);
}

.video-actions input[type="number"] {
  width: 94px;
  border-radius: 999px;
  border: 1px solid rgba(31, 27, 22, 0.18);
  padding: 6px 10px;
  background: #fff;
  font-size: clamp(12px, 1.6vw, 15px);
}

.video-player-shell {
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  background: #12100e;
  aspect-ratio: 16 / 9;
  min-height: 260px;
}

#video-player,
#video-player iframe {
  width: 100%;
  height: 100%;
  display: block;
  border: 0;
}

#video-player {
  position: relative;
  z-index: 1;
}

.video-caption-overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 3;
  display: grid;
  gap: 4px;
  padding: 14px 16px 16px;
  text-align: center;
  color: #fffaf3;
  background: linear-gradient(180deg, transparent 0%, rgba(18, 16, 14, 0.72) 26%, rgba(18, 16, 14, 0.92) 100%);
  pointer-events: none;
}

.video-caption-overlay.empty {
  display: none;
}

.video-caption-hanzi {
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  font-size: clamp(28px, 5vw, 58px);
  line-height: 1.08;
  word-break: break-word;
}

.video-caption-pinyin {
  font-size: clamp(16px, 2.4vw, 24px);
  font-weight: 700;
  color: #f7d8a5;
  word-break: break-word;
}

.video-caption-words {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.video-caption-word {
  border-radius: 999px;
  padding: 4px 9px;
  background: rgba(255, 250, 243, 0.14);
  color: rgba(255, 250, 243, 0.9);
  font-size: clamp(13px, 1.8vw, 18px);
  line-height: 1.2;
}

.video-caption-word.active {
  background: #f7d8a5;
  color: #21170e;
}

.video-caption-translation {
  font-size: clamp(14px, 2vw, 20px);
  color: rgba(255, 250, 243, 0.92);
  word-break: break-word;
}

.video-cue-panel {
  border-radius: 10px;
  border: 1px solid rgba(31, 27, 22, 0.1);
  background: rgba(255, 255, 255, 0.5);
}

.video-cue-panel > summary {
  cursor: pointer;
  font-weight: 700;
  padding: 10px 12px;
  list-style: none;
}

.video-cue-panel > summary::-webkit-details-marker {
  display: none;
}

.video-cue-panel[open] > summary {
  border-bottom: 1px dashed rgba(31, 27, 22, 0.16);
}

#video-captions {
  min-height: 150px;
  border-radius: 14px;
  padding: 12px;
  border: 1px solid rgba(31, 27, 22, 0.14);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: clamp(12px, 1.5vw, 15px);
  background: rgba(255, 255, 255, 0.78);
  resize: vertical;
}

.video-cue-list {
  display: grid;
  gap: 8px;
  max-height: 260px;
  overflow: auto;
  padding: 10px 12px;
}

.video-cue {
  display: grid;
  gap: 4px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.72);
  cursor: pointer;
}

.video-cue.active {
  border-color: rgba(47, 122, 109, 0.75);
  box-shadow: 0 10px 20px rgba(47, 122, 109, 0.14);
}

.video-cue-time {
  font-size: clamp(12px, 1.5vw, 14px);
  color: var(--muted);
  font-weight: 700;
}

.video-cue-hanzi {
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  font-size: clamp(18px, 2.5vw, 28px);
}

.video-cue-pinyin,
.video-cue-translation {
  font-size: clamp(13px, 1.7vw, 16px);
  color: var(--muted);
}

.audio-panel {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.file-import-panel {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.file-import-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.file-import-actions input[type="file"] {
  font-size: clamp(13px, 1.6vw, 16px);
}

.pdf-panel {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.pdf-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.pdf-toolbar input[type="number"] {
  width: 86px;
  border-radius: 999px;
  border: 1px solid rgba(31, 27, 22, 0.22);
  background: #fff;
  padding: 6px 10px;
  font-size: 14px;
}

#pdf-page-range {
  width: 170px;
}

.pdf-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.pdf-tools input[type="color"] {
  width: 36px;
  height: 32px;
  border: 1px solid rgba(31, 27, 22, 0.2);
  border-radius: 8px;
  background: #fff;
  padding: 2px;
}

.pdf-tools input[type="range"] {
  width: 110px;
}

.pdf-viewport {
  width: 100%;
  max-height: 560px;
  min-height: 320px;
  overflow: auto;
  border-radius: 14px;
  border: 1px dashed rgba(31, 27, 22, 0.2);
  background:
    linear-gradient(45deg, rgba(31, 27, 22, 0.03) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(31, 27, 22, 0.03) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(31, 27, 22, 0.03) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(31, 27, 22, 0.03) 75%);
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
}

.pdf-stage {
  position: relative;
  width: 100%;
  min-height: 320px;
  margin: 0 auto;
}

#pdf-canvas,
#pdf-notes-canvas,
#pdf-selection-canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

#pdf-canvas {
  z-index: 1;
}

#pdf-notes-canvas {
  z-index: 2;
  touch-action: none;
  cursor: grab;
}

#pdf-selection-canvas {
  z-index: 3;
  pointer-events: none;
}

.audio-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.audio-trim {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.audio-trim-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.audio-trim input {
  width: 90px;
  border-radius: 999px;
  border: 1px solid rgba(31, 27, 22, 0.2);
  padding: 4px 8px;
  font-size: clamp(12px, 1.6vw, 15px);
  background: #fff;
}

.audio-translation textarea {
  min-height: 110px;
  border-radius: 16px;
  padding: 14px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  font-size: clamp(14px, 1.8vw, 18px);
  font-family: "Avenir Next", "Futura", "Trebuchet MS", "Segoe UI", sans-serif;
  background: rgba(255, 255, 255, 0.7);
  resize: vertical;
}

.selection-panel {
  display: grid;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.grammar-panel {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.grammar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

#grammar-text {
  min-height: 120px;
  border-radius: 14px;
  padding: 12px;
  border: 1px solid rgba(31, 27, 22, 0.14);
  font-size: clamp(14px, 1.8vw, 18px);
  background: rgba(255, 255, 255, 0.75);
  resize: vertical;
}

.grammar-summary {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.grammar-roadmap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.grammar-roadmap-chip {
  border-radius: 999px;
  background: rgba(47, 122, 109, 0.14);
  color: #1d5d51;
  padding: 6px 10px;
  font-size: clamp(12px, 1.5vw, 14px);
  font-weight: 600;
}

.grammar-list {
  display: grid;
  gap: 8px;
  max-height: 280px;
  overflow: auto;
  padding-right: 4px;
}

.grammar-card {
  display: grid;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.74);
}

.grammar-card-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.grammar-level {
  border-radius: 999px;
  background: rgba(211, 106, 78, 0.18);
  color: #7a3a28;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 700;
}

.grammar-title {
  font-weight: 700;
  font-size: clamp(14px, 1.8vw, 18px);
}

.grammar-line {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--ink);
}

.grammar-line.muted {
  color: var(--muted);
}

.grammar-example {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px dashed rgba(31, 27, 22, 0.16);
  background: rgba(255, 255, 255, 0.55);
  display: grid;
  gap: 4px;
}

.grammar-review {
  display: grid;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px dashed rgba(31, 27, 22, 0.18);
  background: rgba(255, 255, 255, 0.55);
}

.grammar-review-question {
  font-weight: 700;
  font-size: clamp(14px, 1.8vw, 18px);
}

.grammar-review-options {
  display: grid;
  gap: 6px;
}

.grammar-review-option {
  border: 1px solid rgba(31, 27, 22, 0.16);
  border-radius: 10px;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.82);
  text-align: left;
  cursor: pointer;
}

.grammar-review-option.correct {
  border-color: rgba(47, 122, 109, 0.65);
  background: rgba(47, 122, 109, 0.12);
}

.grammar-review-option.wrong {
  border-color: rgba(211, 106, 78, 0.65);
  background: rgba(211, 106, 78, 0.12);
}

.grammar-review-feedback {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.library-panel {
  display: grid;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.compliance-panel {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.compliance-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.link-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.module-group {
  border-radius: 16px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.5);
}

#module-video {
  border-color: rgba(47, 122, 109, 0.25);
  background: rgba(47, 122, 109, 0.07);
}

.module-group > summary {
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  font-size: clamp(14px, 1.9vw, 18px);
  color: var(--ink);
  padding: 12px 14px;
  list-style: none;
}

.module-group > summary::-webkit-details-marker {
  display: none;
}

.module-group > summary::before {
  content: ">";
  display: inline-block;
  margin-right: 8px;
  transition: transform 0.2s ease;
}

.module-group[open] > summary::before {
  transform: rotate(90deg);
}

.module-group[open] > summary {
  border-bottom: 1px dashed rgba(31, 27, 22, 0.16);
}

.module-group-body {
  padding: 12px;
}

#module-import-tools .module-group-body {
  display: grid;
  gap: 16px;
}

#module-import-tools .voice-panel {
  order: -50;
}

#module-import-tools .file-import-panel {
  order: -40;
}

#module-import-tools .ocr-panel {
  order: -30;
}

#module-import-tools .hanzi-preview {
  order: -20;
}

#module-import-tools .pdf-panel {
  order: 10;
}

.library-list {
  display: grid;
  gap: 8px;
  max-height: 220px;
  overflow: auto;
  padding-right: 4px;
}

.library-item {
  display: grid;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.7);
}

.library-item-top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.library-item-title {
  font-weight: 600;
  font-size: clamp(14px, 1.8vw, 18px);
}

.library-item-meta {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.library-item-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.library-actions {
  display: flex;
  justify-content: flex-end;
}

.section-title {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.section-title h3 {
  margin: 0;
  font-size: clamp(14px, 1.8vw, 18px);
}

.selection-actions {
  display: grid;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px dashed rgba(31, 27, 22, 0.18);
  background: rgba(255, 255, 255, 0.5);
}

.selection-actions-label {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
  font-weight: 600;
}

.selection-actions-note {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.selection-actions-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.selection-status {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.selection-list {
  display: grid;
  gap: 8px;
  max-height: 240px;
  overflow: auto;
  padding-right: 4px;
}

.selection-item {
  display: grid;
  gap: 4px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.selection-item.selected {
  border-color: rgba(47, 122, 109, 0.7);
  box-shadow: 0 10px 20px rgba(47, 122, 109, 0.12);
}

.selection-item:hover {
  transform: translateY(-1px);
}

.selection-item-title {
  font-weight: 600;
  font-size: clamp(14px, 1.8vw, 18px);
}

.selection-item-subtitle {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.text-actions-panel {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 27, 22, 0.1);
}

.text-actions {
  display: grid;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px dashed rgba(31, 27, 22, 0.18);
  background: rgba(255, 255, 255, 0.5);
}

.text-settings {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.text-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.text-action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: flex-start;
}

.action-block {
  display: grid;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.7);
  min-width: 180px;
}

.action-help {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
  max-width: 220px;
}

.action-block button {
  width: 100%;
}

.text-actions-note {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}
.ocr-drop {
  border: 1px dashed rgba(31, 27, 22, 0.2);
  border-radius: 14px;
  padding: 12px;
  font-size: clamp(13px, 1.8vw, 16px);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.6);
}

.ocr-drop.dragover {
  border-color: var(--accent-cool);
  color: var(--ink);
}

.ocr-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.ocr-actions input[type="file"] {
  font-size: clamp(13px, 1.6vw, 16px);
}

.ocr-camera,
.ocr-image-editor {
  border: 1px dashed rgba(31, 27, 22, 0.18);
  border-radius: 12px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.65);
}

.ocr-image-head {
  font-size: clamp(12px, 1.6vw, 15px);
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 8px;
}

#ocr-camera-video {
  width: 100%;
  max-height: 280px;
  border-radius: 10px;
  background: #111;
  object-fit: contain;
}

#ocr-image-canvas {
  width: 100%;
  max-height: 320px;
  border-radius: 10px;
  border: 1px solid rgba(31, 27, 22, 0.14);
  background: #f8f8f8;
  touch-action: none;
  cursor: crosshair;
}

.ocr-status {
  font-size: clamp(13px, 1.8vw, 16px);
  color: var(--muted);
}

.ocr-status.busy {
  color: #7a3a28;
}

.ocr-status.ok {
  color: #1d5d51;
}

.ocr-status.warn {
  color: #9a4230;
}

.ocr-status.error {
  color: #7d2b25;
}

.ocr-note {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}


.select-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.select-label {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

select {
  border-radius: 999px;
  border: 1px solid rgba(31, 27, 22, 0.2);
  padding: 6px 10px;
  background: #fff;
  font-size: clamp(12px, 1.6vw, 15px);
}

.primary,
.ghost {
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 600;
  font-size: clamp(13px, 1.6vw, 16px);
  cursor: pointer;
}

.primary {
  background: var(--accent);
  color: #fffaf3;
  box-shadow: 0 10px 20px rgba(211, 106, 78, 0.3);
}

.primary:hover {
  background: var(--accent-strong);
}

.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}

.ghost {
  background: rgba(31, 27, 22, 0.08);
  color: var(--ink);
}

.ghost.small {
  padding: 6px 12px;
  font-size: clamp(12px, 1.4vw, 14px);
}

.connection {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.study-area {
  display: grid;
  grid-template-columns: minmax(240px, 300px) 1fr;
  gap: 24px;
}

.hidden {
  display: none;
}

.token-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.token-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  max-height: 620px;
  overflow: auto;
  padding-right: 4px;
}

.token-item {
  display: grid;
  gap: 6px;
  padding: 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.token-item:hover {
  transform: translateY(-2px);
  border-color: rgba(31, 27, 22, 0.2);
}

.token-item.active {
  border-color: rgba(47, 122, 109, 0.6);
  box-shadow: 0 10px 20px rgba(47, 122, 109, 0.16);
}

.token-text {
  font-size: clamp(20px, 3vw, 28px);
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  letter-spacing: 2px;
}

.token-item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.token-select {
  border: 1px solid rgba(31, 27, 22, 0.2);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  width: 26px;
  height: 26px;
  line-height: 1;
  cursor: pointer;
  font-size: 13px;
}

.token-select.selected {
  border-color: rgba(47, 122, 109, 0.7);
  color: #1d5d51;
  background: rgba(47, 122, 109, 0.12);
}

.token-pinyin {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.token-progress {
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: rgba(31, 27, 22, 0.08);
  overflow: hidden;
  position: relative;
}

.token-progress::after {
  content: "";
  position: absolute;
  inset: 0;
  width: calc(var(--level) * 20%);
  background: linear-gradient(90deg, var(--accent-cool), var(--accent));
  border-radius: 999px;
}

.workspace {
  display: grid;
  gap: 18px;
}

.active-card {
  padding: 20px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.85);
  display: grid;
  gap: 12px;
  text-align: center;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.active-hanzi {
  font-size: clamp(40px, 6vw, 64px);
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  letter-spacing: 4px;
}

.active-hanzi.aligned {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  letter-spacing: 0;
}

.active-hanzi.aligned ruby {
  ruby-position: under;
}

.active-hanzi.aligned rt {
  font-size: 0.35em;
  color: var(--muted);
  letter-spacing: 0;
}

.active-pinyin {
  font-size: clamp(14px, 2.2vw, 20px);
  color: var(--muted);
}

.active-translation {
  font-size: clamp(16px, 2.6vw, 22px);
  font-weight: 600;
}

.word-breakdown {
  display: grid;
  gap: 8px;
  text-align: left;
  max-width: 420px;
  margin: 0 auto;
}

.word-breakdown-title {
  font-size: clamp(12px, 1.4vw, 14px);
  color: var(--muted);
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.word-breakdown-list {
  display: grid;
  gap: 6px;
}

.word-breakdown-row {
  display: grid;
  grid-template-columns: auto 28px 1fr;
  gap: 8px;
  align-items: center;
  font-size: clamp(13px, 1.8vw, 16px);
}

.word-breakdown-word {
  font-weight: 600;
}

.word-breakdown-arrow {
  color: var(--muted);
  text-align: center;
}

.word-breakdown-translation {
  color: var(--ink);
}

.word-breakdown-status {
  font-size: clamp(12px, 1.4vw, 14px);
  color: var(--muted);
}

.active-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.pronounce-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pronounce-controls .select-group {
  max-width: min(100%, 340px);
}

.pronounce-controls select {
  max-width: 320px;
}

.memory-panel {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.84)),
    linear-gradient(120deg, rgba(47, 122, 109, 0.12), rgba(211, 106, 78, 0.1));
  display: grid;
  gap: 14px;
}

.memory-header,
.memory-review-head,
.memory-build-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.memory-title h3 {
  font-size: 24px;
}

.memory-due-chip {
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(31, 27, 22, 0.08);
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.memory-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 12px;
  align-items: stretch;
}

.memory-card,
.memory-build,
.memory-review {
  border-radius: 14px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.78);
  padding: 14px;
  display: grid;
  gap: 12px;
}

.memory-card-top {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.memory-glyph {
  width: 112px;
  min-height: 112px;
  border-radius: 16px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background:
    linear-gradient(rgba(31, 27, 22, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 27, 22, 0.06) 1px, transparent 1px),
    rgba(255, 255, 255, 0.88);
  background-size: 28px 28px;
  display: grid;
  place-items: center;
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  font-size: 64px;
  line-height: 1;
}

.memory-meta {
  display: grid;
  gap: 6px;
}

.memory-pinyin {
  font-size: 22px;
  color: #1d5d51;
  font-weight: 700;
}

.memory-meaning {
  font-size: 18px;
  font-weight: 700;
}

.memory-tone {
  width: fit-content;
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(211, 106, 78, 0.14);
  color: #7a3a28;
  font-weight: 700;
}

.memory-tone[data-tone="1"] {
  background: rgba(47, 122, 109, 0.14);
  color: #1d5d51;
}

.memory-tone[data-tone="2"] {
  background: rgba(61, 113, 190, 0.14);
  color: #274e8f;
}

.memory-tone[data-tone="3"] {
  background: rgba(149, 91, 174, 0.15);
  color: #613276;
}

.memory-layer-tabs,
.memory-grade-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.memory-layer-tabs button.active {
  border-color: rgba(47, 122, 109, 0.7);
  background: rgba(47, 122, 109, 0.13);
}

.memory-components {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 8px;
}

.memory-component {
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.78);
  padding: 10px;
  display: grid;
  gap: 4px;
}

.memory-component strong {
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  font-size: 32px;
  line-height: 1;
}

.memory-component span,
.memory-component small,
.memory-context-item,
.memory-context-sentence,
.memory-confusables {
  color: var(--muted);
  line-height: 1.35;
}

.memory-scene-wrap {
  display: grid;
  gap: 6px;
}

#memory-scene {
  min-height: 76px;
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.14);
  padding: 10px 12px;
  resize: vertical;
  background: rgba(255, 255, 255, 0.82);
  font-family: "Avenir Next", "Futura", "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 15px;
}

.memory-context-list {
  display: grid;
  gap: 6px;
}

.memory-build-frame {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
  gap: 8px;
}

.memory-build-slot {
  min-height: 86px;
  border-radius: 12px;
  border: 1px dashed rgba(31, 27, 22, 0.26);
  background: rgba(255, 255, 255, 0.72);
  display: grid;
  place-items: center;
  gap: 4px;
  cursor: pointer;
}

.memory-build-slot span,
.memory-tile {
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  font-size: 34px;
}

.memory-build-slot small {
  color: var(--muted);
}

.memory-build-slot.correct {
  border-color: rgba(47, 122, 109, 0.72);
  background: rgba(47, 122, 109, 0.12);
}

.memory-build-slot.wrong {
  border-color: rgba(211, 106, 78, 0.72);
  background: rgba(211, 106, 78, 0.12);
}

.memory-tile-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.memory-tile {
  min-width: 58px;
  min-height: 58px;
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.16);
  background: rgba(255, 255, 255, 0.92);
  cursor: pointer;
}

.memory-feedback {
  min-height: 24px;
  color: var(--muted);
  font-weight: 700;
}

.memory-review {
  gap: 10px;
}

.memory-review select {
  max-width: min(100%, 320px);
}

.memory-skill-bars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px;
}

.memory-skill-row {
  border-radius: 12px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background: rgba(255, 255, 255, 0.74);
  padding: 8px 10px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 72px auto;
  gap: 8px;
  align-items: center;
  text-align: left;
  cursor: pointer;
}

.memory-skill-row.active {
  border-color: rgba(47, 122, 109, 0.72);
  background: rgba(47, 122, 109, 0.1);
}

.memory-skill-meter {
  height: 8px;
  border-radius: 999px;
  background: rgba(31, 27, 22, 0.1);
  overflow: hidden;
}

.memory-skill-meter i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #2f7a6d, #d36a4e);
}

.memory-skill-row small {
  color: var(--muted);
  white-space: nowrap;
}

.char-selector {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.char-selector button {
  border: 1px solid rgba(31, 27, 22, 0.2);
  border-radius: 12px;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.9);
  cursor: pointer;
}

.char-selector button.active {
  border-color: var(--accent-cool);
  background: rgba(47, 122, 109, 0.15);
}

.canvas-panel {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  display: grid;
  gap: 12px;
}

.canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: clamp(12px, 1.6vw, 15px);
}

.repeat-control {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

.repeat-label {
  font-size: clamp(12px, 1.6vw, 15px);
  color: var(--muted);
}

#repeat-count {
  width: 64px;
  border-radius: 999px;
  border: 1px solid rgba(31, 27, 22, 0.2);
  padding: 4px 8px;
  font-size: clamp(12px, 1.6vw, 15px);
}

.repeat-remaining {
  font-weight: 600;
  color: var(--ink);
}

#draw-canvas {
  width: 100%;
  height: 280px;
  border-radius: 14px;
  border: 1px dashed rgba(31, 27, 22, 0.2);
  background-image:
    linear-gradient(rgba(31, 27, 22, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 27, 22, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  touch-action: none;
}

.canvas-controls {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.feedback-panel {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  display: grid;
  gap: 10px;
}

.sprint-panel {
  padding: 20px;
  border-radius: 20px;
  border: 1px solid rgba(31, 27, 22, 0.12);
  background:
    radial-gradient(circle at 12% 0%, rgba(211, 106, 78, 0.18), transparent 50%),
    radial-gradient(circle at 100% 100%, rgba(47, 122, 109, 0.16), transparent 55%),
    rgba(255, 255, 255, 0.9);
  display: grid;
  gap: 12px;
}

.sprint-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.sprint-title h3 {
  font-size: clamp(22px, 2.8vw, 32px);
}

.sprint-title .hint {
  font-size: clamp(14px, 1.7vw, 18px);
}

.sprint-main-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.sprint-main-btn {
  min-height: 54px;
  min-width: 130px;
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 700;
  touch-action: manipulation;
}

.sprint-settings {
  border-radius: 14px;
  border: 1px dashed rgba(31, 27, 22, 0.2);
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.7);
}

.sprint-settings summary {
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  font-size: clamp(15px, 1.8vw, 18px);
}

.sprint-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.sprint-controls .select-group {
  display: grid;
  gap: 6px;
}

.sprint-controls .select-label {
  font-size: clamp(13px, 1.7vw, 16px);
  font-weight: 700;
}

.sprint-controls select {
  min-height: 46px;
  border-radius: 12px;
  padding: 8px 10px;
  font-size: clamp(15px, 1.9vw, 20px);
}

.sprint-metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.sprint-chip {
  border-radius: 12px;
  padding: 10px 12px;
  background: rgba(31, 27, 22, 0.09);
  font-size: clamp(14px, 1.9vw, 18px);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.25;
}

.sprint-metrics {
  display: none;
}

.sprint-card {
  border-radius: 18px;
  border: 1px solid rgba(31, 27, 22, 0.16);
  padding: 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.88) 100%);
  display: grid;
  gap: 10px;
}

.sprint-card-label {
  font-size: clamp(12px, 1.5vw, 14px);
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--muted);
}

.sprint-prompt {
  min-height: 72px;
  display: flex;
  align-items: center;
  font-size: clamp(34px, 4.4vw, 58px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.4px;
  word-break: break-word;
}

#sprint-panel[data-sprint-kind="hanzi"] .sprint-prompt {
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 500;
  letter-spacing: 1px;
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
}

#sprint-panel[data-sprint-kind="phrase"] .sprint-prompt {
  font-size: clamp(30px, 4.4vw, 52px);
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
}

#sprint-panel[data-sprint-kind="long"] .sprint-prompt {
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.25;
}

.sprint-subprompt {
  font-size: clamp(16px, 2vw, 22px);
  color: var(--muted);
}

.sprint-options-title {
  font-size: clamp(13px, 1.7vw, 16px);
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.sprint-options {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
}

.sprint-option {
  border: 1px solid rgba(31, 27, 22, 0.18);
  border-radius: 14px;
  padding: 12px 14px;
  min-height: 78px;
  background: rgba(255, 255, 255, 0.96);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 600;
  line-height: 1.2;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
  touch-action: manipulation;
}

.sprint-option:hover {
  transform: translateY(-1px);
  border-color: rgba(47, 122, 109, 0.45);
}

.sprint-option:active {
  transform: scale(0.99);
}

.sprint-option.hanzi .sprint-option-text {
  font-size: clamp(28px, 4vw, 46px);
  font-family: "PingFang SC", "Noto Serif CJK SC", "Microsoft YaHei", "Heiti SC", "SimSun", serif;
  font-weight: 500;
}

.sprint-option.text .sprint-option-text {
  font-size: clamp(20px, 2.4vw, 28px);
}

.sprint-option-key {
  min-width: 32px;
  min-height: 32px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  background: rgba(31, 27, 22, 0.1);
  flex-shrink: 0;
}

.sprint-option-text {
  line-height: 1.25;
  word-break: break-word;
}

.sprint-option.correct {
  border-color: rgba(47, 122, 109, 0.68);
  background: rgba(47, 122, 109, 0.12);
}

.sprint-option.wrong {
  border-color: rgba(211, 106, 78, 0.68);
  background: rgba(211, 106, 78, 0.12);
}

.sprint-feedback {
  min-height: 28px;
  font-size: clamp(16px, 1.9vw, 20px);
  color: var(--muted);
  font-weight: 600;
}

.sprint-tip {
  font-size: clamp(13px, 1.6vw, 16px);
}

@media (max-width: 1100px) {
  .memory-stage {
    grid-template-columns: 1fr;
  }

  .sprint-header {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .sprint-main-actions {
    justify-content: flex-start;
  }

  .sprint-controls {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .memory-header,
  .memory-review-head,
  .memory-build-head {
    align-items: stretch;
    flex-direction: column;
  }

  .memory-card-top {
    grid-template-columns: 1fr;
  }

  .memory-glyph {
    width: 100%;
  }

  .memory-skill-row {
    grid-template-columns: 1fr;
  }

  .sprint-main-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .sprint-options {
    grid-template-columns: 1fr;
  }

  .sprint-main-btn {
    width: 100%;
  }
}

.feedback-status {
  font-size: clamp(16px, 2.4vw, 22px);
  font-weight: 600;
}

.feedback-status.correct {
  color: #1d5d51;
}

.feedback-status.try {
  color: #9a4230;
}

.feedback-candidates {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.candidate {
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(31, 27, 22, 0.08);
  font-size: clamp(12px, 1.6vw, 15px);
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #1f1b16;
  color: #fff8ef;
  padding: 12px 16px;
  border-radius: 12px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

body.list-collapsed .token-panel {
  display: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .study-area {
    grid-template-columns: 1fr;
  }

  .token-panel {
    order: 3;
  }

  .canvas-controls {
    justify-content: space-between;
  }
}

@media (max-width: 640px) {
  .app {
    padding: 20px 16px 32px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .brand-title {
    font-size: 18px;
  }

  .active-hanzi {
    font-size: 40px;
  }

  .pronounce-controls {
    justify-content: flex-start;
  }

  .pronounce-controls select {
    max-width: 100%;
  }

  .pdf-toolbar,
  .pdf-tools {
    align-items: stretch;
  }

  #pdf-page-range {
    width: 100%;
    min-width: 140px;
  }

  .pdf-viewport {
    max-height: 420px;
  }

  .canvas-controls {
    flex-wrap: wrap;
    gap: 8px;
  }

  .canvas-controls button {
    flex: 1 1 auto;
  }
}