:root {
  --bg-top: #f8f1e6;
  --bg-bottom: #eee0ca;
  --panel: #fff8f1;
  --panel-strong: #fffaf4;
  --text: #201914;
  --muted: #6d6358;
  --line: rgba(103, 82, 58, 0.14);
  --accent: #bc6039;
  --accent-deep: #8d391b;
  --accent-soft: rgba(188, 96, 57, 0.14);
  --grid-line: rgba(103, 82, 58, 0.035);
  --shadow: 0 18px 42px rgba(91, 67, 44, 0.09);
  --bottom-nav-height: 58px;
  --bottom-nav-safe-height: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom, 0px));
  --page-frame-gap: 20px;
  --mobile-frame-gap: 12px;
  --radius-xl: 30px;
  --font-body:
    "PingFang SC",
    "Hiragino Sans GB",
    "Noto Sans CJK SC",
    "Source Han Sans SC",
    "Microsoft YaHei",
    "Helvetica Neue",
    sans-serif;
  --font-display:
    "Songti SC",
    "STSong",
    "Source Han Serif SC",
    "Noto Serif CJK SC",
    "PingFang SC",
    serif;
}

body[data-theme="green"] {
  --bg-top: #eef7ec;
  --bg-bottom: #ddeedb;
  --panel: #f7fdf6;
  --panel-strong: #f8fdf8;
  --text: #172018;
  --muted: #55685a;
  --line: rgba(78, 108, 82, 0.14);
  --accent: #5f8f64;
  --accent-deep: #345f3d;
  --accent-soft: rgba(95, 143, 100, 0.14);
  --grid-line: rgba(78, 108, 82, 0.03);
  --shadow: 0 16px 38px rgba(68, 98, 72, 0.09);
}

* {
  box-sizing: border-box;
}

/* 全局去除移动端点击蓝色高亮 */
* {
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  /* html 是真正的滚动容器，在这里设置 overscroll 防止安卓下拉刷新 */
  overscroll-behavior-y: contain;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 430;
  letter-spacing: 0.01em;
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  /* clip 不创建 BFC/scroll container，不会被安卓 WebView 当作滚动元素拦截触摸手势 */
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.65;
  pointer-events: none;
  z-index: -1;
}

.account-card {
  margin-top: 20px;
  padding: 24px;
  border-radius: 30px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  display: grid;
  gap: 20px;
}

.account-summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
}

.account-avatar {
  width: 72px;
  height: 72px;
  border-radius: 22px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 45%, white));
  color: white;
  font-size: 1.8rem;
  font-weight: 700;
}

.account-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.account-copy {
  display: grid;
  gap: 8px;
}

.account-meta,
.account-side-copy {
  color: var(--muted);
  line-height: 1.6;
}

.account-badge {
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
  color: var(--accent-deep);
}

.account-badge.is-expired {
  color: #8f2f25;
  border-color: rgba(143, 47, 37, 0.2);
  background: rgba(143, 47, 37, 0.08);
}

.account-panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.account-form {
  display: grid;
  gap: 12px;
  padding: 20px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid var(--line);
}

.account-form h4 {
  font-size: 1.2rem;
}

.account-form input[type="email"],
.account-form input[type="password"],
.account-form input[type="text"],
.account-form input[type="file"] {
  width: 100%;
}

.account-side-panel {
  align-content: start;
}

.profile-check {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.account-logout-button {
  width: fit-content;
  cursor: pointer;
}

.inline-author {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.inline-author-avatar,
.comment-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.inline-author-avatar {
  width: 30px;
  height: 30px;
  border-radius: 999px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 40%, white));
  color: white;
  display: grid;
  place-items: center;
  font-size: 0.86rem;
  font-weight: 700;
}

h1,
h2,
h3,
h4,
h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.015em;
}

p {
  margin: 0;
}

button,
input,
textarea {
  font: inherit;
}

select {
  font: inherit;
}

.page-shell {
  width: min(1520px, calc(100% - 10px));
  margin: 0 auto;
  padding: 20px 0 56px;
  contain: layout style paint;
}

body[data-tab] .page-shell {
  padding-top: var(--page-frame-gap);
  padding-bottom: 0;
}

.hero,
.library-section,
.topic-sidebar,
.topic-detail,
.workflow-card,
.generator-card,
.request-group-card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  contain: layout paint style;
}

.hero {
  border-radius: 36px;
  padding: 24px;
}

.library-section {
  border-radius: 34px;
  padding: 24px;
  --section-content-rail: 18px;
}

.topbar,
.library-layout,
.workflow-grid,
.section-head,
.library-tools,
.sidebar-head,
.word-grid,
.phrase-grid,
.sentence-grid,
.requests-main,
.requests-summary,
.request-groups {
  display: grid;
  gap: 20px;
}

.stats-grid,
.priority-buckets {
  display: grid;
  gap: 20px;
}

.topbar {
  grid-template-columns: 1fr auto;
  align-items: start;
  margin-bottom: 14px;
}

.topbar-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.library-title-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.library-export-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.export-button {
  cursor: pointer;
  padding: 12px 18px;
}

.brand {
  display: flex;
  gap: 22px;
  align-items: center;
}

.brand-stack {
  display: grid;
  justify-items: start;
  align-content: center;
  gap: 8px;
  margin-left: 20px;
}

.brand-mark {
  width: 76px;
  height: 76px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, white));
  color: white;
  font-weight: 700;
  font-size: 2rem;
  letter-spacing: 0.08em;
}

.brand-image {
  width: 76px;
  height: 76px;
  object-fit: cover;
  display: block;
  border-radius: 20px;
}

.brand-copy {
  display: grid;
  align-content: center;
  gap: 12px;
  flex: 1;
}

.brand-copy h1 {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.1;
}

.brand-subtitle {
  color: var(--accent-deep);
  width: 76px;
  text-align: center;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.section-kicker,
.panel-label,
.card-label {
  color: var(--accent-deep);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.topbar-link,
.primary-button,
.mode-button,
.theme-chip,
.topic-button {
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.topbar-link {
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(255, 252, 247, 0.9));
  padding: 12px 18px;
  box-shadow: 0 10px 22px rgba(125, 93, 61, 0.06);
}

.topbar-nav-link {
  display: none; /* 桌面端隐藏，手机端通过 media query 显示 */
  border: 1px solid color-mix(in srgb, var(--accent-deep) 10%, var(--line));
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 250, 244, 0.92));
  box-shadow: 0 10px 22px rgba(125, 93, 61, 0.05);
  padding: 10px 18px;
  color: color-mix(in srgb, var(--muted) 88%, var(--text));
  font-weight: 700;
  letter-spacing: 0.01em;
  position: relative;
  width: auto;
}

.topbar-nav-link::after {
  display: none;
}

.topbar-nav-link:visited {
  color: color-mix(in srgb, var(--muted) 88%, var(--text));
}

.topbar-nav-link:hover {
  transform: translateY(-2px);
  color: var(--accent-deep);
  border-color: color-mix(in srgb, var(--accent-deep) 20%, var(--line));
}

.inbox-button {
  border: 1px solid color-mix(in srgb, var(--accent-deep) 18%, var(--line));
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel-strong) 96%, white), color-mix(in srgb, var(--panel-strong) 88%, white));
  border-radius: 999px;
  width: 56px;
  height: 56px;
  padding: 0;
  display: grid;
  place-items: center;
  cursor: pointer;
  position: relative;
  box-shadow: 0 12px 28px rgba(140, 93, 54, 0.08);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.inbox-entry {
  text-decoration: none;
  flex: 0 0 auto;
}

.inbox-button:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent-deep) 34%, var(--line));
  box-shadow: 0 14px 30px rgba(140, 93, 54, 0.12);
}

.inbox-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 72%, white), color-mix(in srgb, white 70%, var(--accent-soft)));
  color: var(--accent-deep);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.inbox-badge {
  position: absolute;
  top: -3px;
  right: -3px;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: #c64d3a;
  color: white;
  font-size: 0.76rem;
  font-weight: 700;
  box-shadow: 0 0 0 3px var(--panel-strong);
}

.inbox-badge[hidden] {
  display: none !important;
}

.topbar-link:hover,
.primary-button:hover,
.mode-button:hover,
.theme-chip:hover,
.topic-button:hover {
  transform: translateY(-2px);
}

.theme-picker {
  display: grid;
  gap: 8px;
  justify-items: end;
}

.theme-picker span,
.mode-box span,
.sidebar-head p,
.word-meta,
.topic-summary,
.generator-status,
.generator-tip,
.workflow-card p,
.hero-note {
  color: var(--muted);
  line-height: 1.75;
}

.theme-switch,
.mode-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-start;
}

.theme-chip,
.mode-button {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 15px;
  cursor: pointer;
  font-weight: 600;
}

.theme-chip.active,
.mode-button.active,
.topic-button.active {
  background: linear-gradient(135deg, var(--accent-soft), color-mix(in srgb, var(--accent) 8%, white));
  border-color: color-mix(in srgb, var(--accent-deep) 22%, transparent);
  color: var(--accent-deep);
}

.hero-panel,
.topic-sidebar,
.topic-detail,
.workflow-card,
.generator-card,
.request-group-card,
.notice-board {
  padding: 20px;
  border-radius: var(--radius-xl);
}

.notice-board {
  display: grid;
  gap: 12px;
  align-content: start;
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

.notice-board-inline {
  margin-top: 14px;
  width: 100%;
}

.notice-kicker {
  color: var(--accent-deep);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.notice-board h3 {
  font-size: 1.25rem;
  line-height: 1.28;
}

.notice-list {
  display: grid;
  gap: 10px;
  max-height: 158px;
  align-content: start;
  overflow: auto;
  overscroll-behavior: contain;
  padding-right: 4px;
}

.notice-item {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
  contain: layout paint style;
}

.notice-item:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent-deep) 18%, transparent);
  background: color-mix(in srgb, var(--panel-strong) 90%, white);
}

.notice-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.notice-item-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.notice-item strong {
  font-size: 1rem;
  line-height: 1.45;
}

.notice-date {
  color: var(--muted);
  font-size: 0.95rem;
}

.notice-tag {
  width: fit-content;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.summary-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.spotlight-panel {
  display: grid;
  gap: 8px;
}

body[data-tab="home"] .hero {
  display: flex;
  flex-direction: column;
}

.hero-metric-line {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-metric-line strong {
  font-size: clamp(3.3rem, 5vw, 4.5rem);
  line-height: 1;
}

.panel-label {
  font-size: clamp(1.68rem, 2.4vw, 2rem);
  letter-spacing: 0.02em;
  margin: 0;
  font-weight: 700;
  line-height: 1.1;
}

.hero-note {
  color: var(--muted);
  font-size: clamp(1.08rem, 1.6vw, 1.26rem);
  font-weight: 400;
  margin-top: 2px;
}

.home-request-insights {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 18px;
  margin-top: auto;
  padding-top: clamp(24px, 5vh, 72px);
}

.home-insight-card {
  display: grid;
  align-content: start;
  gap: 18px;
  min-height: 230px;
  padding: 20px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 88%, white);
}

.home-insight-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.home-insight-head h2 {
  font-size: clamp(1.45rem, 2.1vw, 2rem);
  line-height: 1.18;
}

.home-insight-link {
  width: fit-content;
  white-space: nowrap;
}

.home-topic-vote-chart {
  display: grid;
  gap: 12px;
}

.home-topic-bar-row {
  display: grid;
  grid-template-columns: minmax(150px, 0.42fr) minmax(120px, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.home-topic-bar-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.home-topic-bar-meta strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.home-topic-rank {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: var(--accent-deep);
  background: var(--accent-soft);
  font-weight: 700;
  font-size: 0.9rem;
}

.home-topic-bar-track {
  height: 14px;
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in srgb, var(--line) 48%, white);
}

.home-topic-bar-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
}

.home-topic-count {
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.home-category-pie-chart {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
}

.home-category-chart {
  width: 170px;
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 14px;
  display: grid;
  place-items: center;
  box-shadow: inset 0 0 0 1px rgba(125, 93, 61, 0.08);
}

.home-category-chart-center {
  width: 68%;
  height: 68%;
  border-radius: 50%;
  display: grid;
  place-items: center;
  text-align: center;
  background: color-mix(in srgb, var(--panel) 90%, white);
  box-shadow: inset 0 0 0 1px rgba(125, 93, 61, 0.08);
}

.home-category-chart-center span,
.home-category-legend em {
  color: var(--muted);
}

.home-category-chart-center strong {
  font-size: 2rem;
  line-height: 1;
}

.home-category-legend {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.home-category-legend li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
}

.home-category-legend strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.home-category-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--legend-color);
}

.library-section,
.generator-card,
.workflow-section {
  margin-top: 28px;
  content-visibility: auto;
  contain-intrinsic-size: 720px;
}

.section-head {
  grid-template-columns: 1fr auto;
  align-items: end;
  margin-bottom: 18px;
  padding-inline: var(--section-content-rail, 0);
}

.section-head h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  padding-left: 0.04em;
}

.library-tools {
  grid-template-columns: auto;
  justify-content: start;
  justify-items: start;
  padding-inline: var(--section-content-rail, 0);
}

.mode-box {
  display: grid;
  gap: 10px;
  width: 100%;
  justify-items: start;
}

.mode-box span {
  display: block;
  text-align: left;
}

.library-layout {
  grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
  align-items: start;
  gap: 18px;
  position: relative;
  padding-inline: var(--section-content-rail, 0);
}

.topic-sidebar {
  position: sticky;
  top: 18px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  min-height: 0;
  user-select: none;
  -webkit-user-select: none;
}

.sidebar-head {
  --sidebar-content-inset: 20px;
}

.sidebar-head > div {
  padding-inline: var(--sidebar-content-inset);
}

.workflow-section {
  --section-content-rail: 18px;
}

.workflow-grid {
  padding-inline: var(--section-content-rail, 0);
}

.topic-list-shell {
  position: relative;
  flex: 1 1 auto;
  min-height: 260px;
  height: min(52vh, 430px);
  margin-top: 18px;
  padding-right: 18px;
}

.topic-list {
  display: grid;
  gap: 12px;
  height: 100%;
  min-height: 0;
  padding-right: 10px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}

.topic-list-scrollbar {
  position: absolute;
  top: 10px;
  right: 3px;
  bottom: 10px;
  width: 8px;
  border-radius: 999px;
  background: transparent;
  pointer-events: auto;
  cursor: pointer;
  z-index: 3;
}

.topic-list-scroll-thumb {
  position: absolute;
  top: 0;
  left: 1px;
  width: 6px;
  min-height: 48px;
  border-radius: 999px;
  background: rgba(104, 100, 96, 0.8);
  box-shadow: none;
  cursor: grab;
}

.topic-list-scroll-thumb.is-dragging {
  cursor: grabbing;
}

.topic-list::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.topic-search input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  border-radius: 16px;
  min-height: 64px;
  padding: 11px var(--sidebar-content-inset);
  outline: none;
}

.topic-search input::placeholder {
  color: var(--muted);
}

.topic-button {
  width: 100%;
  min-height: 60px;
  display: flex;
  align-items: center;
  text-align: left;
  border: 1px solid color-mix(in srgb, var(--line) 92%, white);
  background: var(--panel-strong);
  color: var(--text);
  border-radius: 16px;
  padding: 12px 20px 12px calc(var(--sidebar-content-inset) + 10px);
  cursor: pointer;
}

.topic-title {
  font-size: 14pt;
  line-height: 1.35;
  font-weight: 650;
  letter-spacing: 0.01em;
  padding-left: 10px;
}

.topic-button.active .topic-title {
  font-weight: 700;
}

.detail-head {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
  user-select: none;
  -webkit-user-select: none;
}

.detail-head h3 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.detail-badge {
  display: inline-flex;
  width: fit-content;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.95rem;
}

.accordion-stack {
  display: grid;
  gap: 16px;
}

.accordion-section {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  overflow: hidden;
  border-radius: 24px;
  contain: layout paint style;
  content-visibility: auto;
  contain-intrinsic-size: 320px;
}

.accordion-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  font-weight: 700;
  font-size: 1.18rem;
  line-height: 1.55;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

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

.accordion-summary:focus,
.accordion-summary:focus-visible {
  outline: none;
}

.accordion-section:focus-within {
  border-color: var(--line);
  box-shadow: none;
}

.accordion-summary::after {
  content: "";
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--accent-deep);
  border-bottom: 2px solid var(--accent-deep);
  transform: rotate(45deg);
  transition: transform 180ms ease;
  margin-left: auto;
}

.accordion-section[open] .accordion-summary::after {
  transform: rotate(-135deg);
}

.accordion-body {
  padding: 0 20px 20px;
  user-select: none;
  -webkit-user-select: none;
}

.word-grid,
.phrase-grid,
.sentence-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.workflow-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stats-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.priority-buckets {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.word-card,
.phrase-card,
.sentence-card,
.workflow-card {
  padding: 18px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 22px;
  contain: layout paint style;
}

.word-card h5,
.sentence-card h5,
.workflow-card h3 {
  margin-bottom: 10px;
  font-size: 1.34rem;
  line-height: 1.5;
}

.request-category-line {
  color: var(--muted);
  margin-top: 8px;
  line-height: 1.7;
}

.stat-card h3,
.priority-bucket-card h3 {
  margin-top: 6px;
}

.priority-bucket-card {
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: var(--shadow);
}

.word-entry-list {
  display: grid;
  gap: 12px;
}

.word-card-wide {
  grid-column: 1 / -1;
}

.word-entry-list-wide {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.word-entry,
.sentence-item {
  display: grid;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px dashed color-mix(in srgb, var(--muted) 25%, transparent);
}

.word-entry.is-focus-target,
.phrase-card.is-focus-target,
.sentence-item.is-focus-target {
  padding: 12px 14px;
  margin: -12px -14px 0;
  border-radius: 18px;
  border-top-color: transparent;
  background: color-mix(in srgb, var(--panel-strong) 92%, white);
  box-shadow: none;
}

.word-entry:first-of-type,
.sentence-item:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.word-main,
.sentence-pair,
.phrase-card {
  display: grid;
  gap: 8px;
}

.pair-line.primary,
.pair-line.single {
  font-weight: 700;
  font-size: 14pt;
  line-height: 1.68;
  letter-spacing: 0.01em;
}

.word-entry .pair-line.secondary:first-of-type,
.word-main .pair-line.secondary:first-of-type {
  font-size: 1.38rem;
  line-height: 1.64;
  letter-spacing: 0.012em;
  color: color-mix(in srgb, var(--text) 78%, var(--muted));
}

.pair-line.secondary {
  color: color-mix(in srgb, var(--text) 84%, var(--muted));
  font-size: 1.18rem;
  line-height: 1.82;
  letter-spacing: 0.008em;
}

.word-meta {
  color: color-mix(in srgb, var(--text) 84%, var(--muted));
  font-size: 1.14rem;
  line-height: 1.82;
  letter-spacing: 0.008em;
}

.generator-card {
  display: grid;
  gap: 14px;
  --card-content-rail: 18px;
}

.generator-card > .card-head,
.generator-card > .generator-tip,
.generator-card > .field-label,
.generator-card > .challenge-shell > .challenge-headline,
.generator-card > .challenge-shell > .challenge-input-head,
.generator-card > .challenge-shell > .challenge-actions,
.generator-card > .challenge-shell > .challenge-feedback-box {
  padding-inline: var(--card-content-rail);
}

.generator-card > input,
.generator-card > select,
.generator-card > textarea,
.generator-card > .paper-upload-box,
.embedded-request-block > input,
.embedded-request-block > select,
.embedded-request-block > textarea,
.embedded-request-block > .paper-upload-box {
  width: calc(100% - (var(--card-content-rail) * 2));
  margin-inline: var(--card-content-rail);
}

.embedded-request-block {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.embedded-request-block > .card-head,
.embedded-request-block > .generator-tip,
.embedded-request-block > .field-label {
  padding-inline: var(--card-content-rail);
}

.generator-card > .submit-button,
.embedded-request-block > .submit-button {
  margin-inline-start: var(--card-content-rail);
}

.generator-card > .generator-status,
.embedded-request-block > .generator-status {
  width: calc(100% - (var(--card-content-rail) * 2));
  margin-inline: var(--card-content-rail);
}

.embedded-request-head {
  margin-bottom: 14px;
}

.embedded-request-head h3 {
  font-size: 1.58rem;
  line-height: 1.18;
}

.embedded-request-block .generator-tip {
  margin-bottom: 18px;
}

.embedded-request-block .field-label {
  margin-top: 14px;
  margin-bottom: 10px;
}

.embedded-request-block .paper-upload-box {
  margin-bottom: 16px;
}

.embedded-request-block .submit-button {
  margin-top: 2px;
}

.embedded-request-block .generator-status {
  margin-top: 14px;
}

.request-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.request-link {
  white-space: nowrap;
}

.section-kicker {
  margin-bottom: 8px;
}

.generator-card h3 {
  font-size: clamp(1.65rem, 2.6vw, 2.45rem);
  line-height: 1.15;
}

.generator-tip,
.generator-status {
  display: flex;
  gap: 0;
  align-items: flex-start;
  font-size: 0.96rem;
  line-height: 1.7;
}

.generator-tip {
  color: var(--text);
  font-weight: 500;
}

.generator-tip-text {
  display: block;
  font-size: 0.98rem;
  line-height: 1.72;
}

.feedback-category-tip {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
  margin-top: -4px;
}

.tip-star {
  color: var(--accent-deep);
  font-size: 1rem;
  line-height: 1.9;
  display: none;
}

.field-label {
  display: block;
  margin-top: 6px;
  margin-bottom: 8px;
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.5;
}

#request-topic-input,
#paper-request-name-input,
.paper-upload-box,
.feedback-select,
.request-note {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 88%, white);
  padding: 16px 18px;
}

.request-note {
  min-height: 120px;
  resize: vertical;
}

#paper-request-name-input {
  min-height: 52px;
  border-radius: 22px;
  background: color-mix(in srgb, var(--panel-strong) 92%, white);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
  width: 100%;
  box-sizing: border-box;
}

.paper-upload-box {
  min-height: 168px;
  display: grid;
  place-items: center;
  gap: 8px;
  text-align: center;
  cursor: pointer;
  padding: 20px;
}

.paper-upload-plus {
  width: 60px;
  height: 60px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  border: 1px dashed color-mix(in srgb, var(--accent-deep) 26%, transparent);
  background: color-mix(in srgb, var(--accent-soft) 55%, white);
  color: var(--accent-deep);
  font-size: 2rem;
  line-height: 1;
}

.paper-upload-text {
  font-weight: 700;
}

.paper-upload-name {
  color: var(--muted);
  font-size: 1rem;
}

.submit-button {
  width: fit-content;
  border-radius: 999px;
  padding: 14px 22px;
  font-weight: 600;
  cursor: pointer;
  color: white;
  border: 0;
  background: linear-gradient(135deg, var(--accent-deep), var(--accent));
}

.compact-hero {
  margin-bottom: 24px;
}

.requests-main,
.request-groups,
.requests-summary {
  display: grid;
  gap: 18px;
}

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

.request-group-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
}

.request-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.request-badge {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.98rem;
}

.request-entry-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.request-entry {
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

.request-entry p {
  line-height: 1.7;
}

.request-note-line {
  margin-top: 8px;
}

.inline-link {
  color: var(--accent-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.feedback-card {
  display: grid;
  gap: 18px;
}

.category-chart-card {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}

.category-chart-wrap {
  display: grid;
  place-items: center;
}

.category-chart {
  width: min(100%, 260px);
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 18px;
  display: grid;
  place-items: center;
  box-shadow: inset 0 0 0 1px rgba(125, 93, 61, 0.08);
}

.category-chart-center {
  width: 68%;
  height: 68%;
  border-radius: 50%;
  background: color-mix(in srgb, var(--panel) 90%, white);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 18px;
  box-shadow: inset 0 0 0 1px rgba(125, 93, 61, 0.08);
}

.category-chart-center span,
.category-chart-center p,
.category-legend-card p {
  color: var(--muted);
}

.category-chart-center strong {
  font-size: clamp(2.3rem, 4vw, 3rem);
  line-height: 1;
}

.category-chart-copy {
  display: grid;
  gap: 8px;
}

.category-chart-copy h3 {
  font-size: clamp(1.8rem, 2.8vw, 2.4rem);
  line-height: 1.1;
}

.category-legend-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.category-legend-card {
  background: color-mix(in srgb, var(--panel) 94%, white);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 18px 20px;
  display: grid;
  gap: 12px;
}

.category-legend-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.category-legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--legend-color);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--legend-color) 14%, white);
}

.category-legend-head h3 {
  font-size: 1.12rem;
  line-height: 1.2;
}

.category-legend-bar {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-soft) 60%, white);
  overflow: hidden;
}

.category-legend-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--legend-color);
}

.category-legend-percent {
  font-weight: 700;
  color: var(--accent-deep);
}

.comment-thread {
  display: grid;
  gap: 14px;
  padding-top: 10px;
}

.comment-thread-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.comment-count {
  color: var(--muted);
  font-size: 1rem;
}

.comment-trigger {
  border: 0;
  background: transparent;
  color: var(--accent-deep);
  cursor: pointer;
  font-weight: 700;
  padding: 0;
}

.comment-list {
  display: grid;
  gap: 12px;
}

.comment-card {
  display: flex;
  gap: 12px;
  padding: 14px 0 0;
  border-top: 1px dashed color-mix(in srgb, var(--muted) 22%, transparent);
}

.comment-avatar {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent-soft) 85%, white);
  color: var(--accent-deep);
  font-weight: 700;
  flex: 0 0 auto;
}

.comment-body {
  min-width: 0;
  flex: 1;
  display: grid;
  gap: 6px;
}

.comment-meta {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.comment-author-line {
  display: flex;
  align-items: center;
  gap: 8px;
}

.comment-owner-badge {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(118, 118, 118, 0.14);
  color: #666;
  font-size: 0.84rem;
  font-weight: 700;
}

.comment-time {
  color: var(--muted);
  font-size: 0.96rem;
}

.comment-form {
  display: grid;
  gap: 10px;
  padding-top: 4px;
}

.comment-form-row {
  display: grid;
}

.comment-content-input {
  min-height: 96px;
}

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

.feedback-inline-status {
  min-height: 1.6em;
}

.challenge-card {
  gap: 18px;
}

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

.challenge-headline,
.challenge-actions,
.challenge-feedback-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.challenge-progress {
  color: var(--muted);
  font-size: 0.96rem;
}

.challenge-progress strong {
  color: var(--accent-deep);
  font-size: 1.1em;
}

.challenge-prompt-box {
  padding: 18px 20px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 90%, white);
}

.challenge-prompt-box h4 {
  margin-top: 8px;
  font-family: "Georgia", "Times New Roman", "STSong", serif;
  font-weight: 700;
  letter-spacing: 0.01em;
  font-size: clamp(1.5rem, 2vw, 2rem);
  line-height: 1.2;
}

.restoration-clue-box {
  padding: 18px 20px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 90%, white);
}

.restoration-clue {
  margin-top: 8px;
  color: var(--ink);
  font-size: clamp(1.28rem, 2.4vw, 1.5rem);
  line-height: 1.86;
}

.challenge-input-head {
  display: grid;
  gap: 6px;
}

.challenge-input-tip {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

#challenge-answer-input {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 88%, white);
  padding: 16px 18px;
}

#restoration-answer-input {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 88%, white);
  padding: 16px 18px;
}

.challenge-open-topic[hidden] {
  display: none;
}

.mastery-panel {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: color-mix(in srgb, var(--panel-strong) 92%, white);
  overflow: hidden;
}

.mastery-summary {
  padding: 18px 22px;
}

.mastery-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
  padding: 0 20px 20px;
}

.mastery-sidebar,
.mastery-ring-card,
.mastery-meta-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: color-mix(in srgb, var(--panel) 88%, white);
}

.mastery-sidebar {
  padding: 18px;
  display: grid;
  gap: 14px;
  align-content: start;
}

.mastery-sidebar-head {
  display: grid;
  gap: 4px;
}

.mastery-sidebar-head p,
.mastery-meta p,
.mastery-hint {
  color: var(--muted);
  line-height: 1.7;
}

.mastery-topic-list {
  display: grid;
  gap: 10px;
  max-height: 300px;
  overflow: auto;
  padding-right: 4px;
}

.mastery-topic-button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mastery-topic-rate {
  color: var(--accent-deep);
  font-weight: 700;
}

.mastery-display {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 18px;
}

.mastery-ring-card,
.mastery-meta-card {
  padding: 20px;
}

.mastery-ring-card {
  display: grid;
  place-items: center;
}

.mastery-ring {
  --mastery-percent: 0;
  width: 210px;
  height: 210px;
  border-radius: 50%;
  background:
    conic-gradient(
      #4b9a5a 0 calc(var(--mastery-percent) * 1%),
      #d36452 calc(var(--mastery-percent) * 1%) 100%
    );
  display: grid;
  place-items: center;
}

.mastery-ring.is-empty {
  background: conic-gradient(#b8b2aa 0 100%);
}

.mastery-ring-center {
  width: 146px;
  height: 146px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--panel-strong) 94%, white);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 18px;
}

.mastery-ring-center strong {
  font-size: 2rem;
  line-height: 1;
}

.mastery-ring-center span {
  color: var(--muted);
  line-height: 1.5;
}

.mastery-meta-card {
  display: grid;
  gap: 12px;
  align-content: center;
}

.mastery-meta {
  display: grid;
  gap: 8px;
}

.mastery-hint-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.mastery-hint {
  color: #b4462f;
  font-weight: 600;
}

.mastery-hint-row.is-positive .mastery-hint {
  color: #4b9a5a;
}

.mastery-review-button[hidden] {
  display: none;
}

.feedback-select {
  appearance: none;
}

.admin-json-box {
  min-height: 240px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 1rem;
  line-height: 1.6;
}

.empty-state {
  min-height: 320px;
  display: grid;
  place-items: center;
  text-align: center;
}

@media (max-width: 1100px) {
  .library-layout,
  .section-head,
  .library-tools,
  .request-group-head,
  .workflow-grid,
  .priority-buckets,
  .summary-grid,
  .word-grid,
  .phrase-grid,
  .sentence-grid,
  .topbar {
    grid-template-columns: 1fr;
  }

  .theme-picker {
    justify-items: start;
  }

  .topbar-links {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 12px 18px;
    padding-top: 0;
  }

  .category-chart-card,
  .category-legend-grid {
    grid-template-columns: 1fr;
  }

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

  .challenge-headline,
  .challenge-actions,
  .challenge-feedback-box,
  .comment-meta,
  .mastery-display,
  .mastery-hint-row {
    align-items: start;
    flex-direction: column;
  }

  .topic-sidebar {
    position: static;
  }

  .topic-list,
  .mastery-layout,
  .account-panel-grid {
    grid-template-columns: 1fr;
  }

  .topic-list-shell {
    height: min(50vh, 420px);
  }

}

@media (max-width: 720px) {
  :root {
    --page-frame-gap: 12px;
  }

  .page-shell {
    width: min(100% - 7px, 1560px);
    padding-top: 12px;
  }

  .hero,
  .topic-sidebar,
  .topic-detail,
  .generator-card,
  .workflow-card,
  .accordion-section,
  .request-group-card {
    border-radius: 22px;
  }

  .theme-switch,
  .mode-group {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .category-chart {
    width: min(100%, 220px);
  }

  .theme-chip,
  .mode-button,
  .submit-button,
  .request-link,
  .topbar-link {
    width: 100%;
    text-align: center;
  }

  .topbar-nav-link {
    width: auto;
    text-align: left;
  }

  .home-request-insights {
    grid-template-columns: 1fr;
  }

  .home-insight-link {
    width: fit-content;
  }

  .home-category-pie-chart {
    grid-template-columns: minmax(150px, 180px) minmax(0, 1fr);
  }

  .topbar-nav-link::after {
    bottom: -4px;
  }

  .topic-list-shell {
    height: 46vh;
  }

  .topic-list {
    display: grid;
    gap: 12px;
    overflow-x: hidden;
    overflow-y: auto;
    padding-bottom: 0;
  }

  .topic-button {
    min-width: 0;
    flex: initial;
  }

  .mastery-topic-list {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    overflow-y: hidden;
    max-height: none;
    padding-bottom: 4px;
  }

  .mastery-topic-button {
    min-width: 150px;
    flex: 0 0 auto;
  }

  .brand {
    align-items: flex-start;
  }

  .account-summary {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .accordion-summary {
    padding: 16px;
  }

  .accordion-body {
    padding: 0 16px 16px;
  }

  .word-entry-list-wide {
    grid-template-columns: 1fr;
  }
}

/* ── Upload drop zone ─────────────────────────────────────────── */
.upload-drop-zone {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  margin-bottom: 12px;
  border: 2px dashed rgba(157, 91, 45, 0.35);
  border-radius: 14px;
  background: rgba(255, 248, 240, 0.6);
  cursor: pointer;
  transition: border-color 180ms, background 180ms;
}
.upload-drop-zone:hover,
.upload-drop-zone.drag-over {
  border-color: rgba(157, 91, 45, 0.75);
  background: rgba(255, 240, 220, 0.7);
}
.upload-drop-hint {
  margin: 0;
  font-size: 0.88rem;
  color: rgba(157, 91, 45, 0.75);
  pointer-events: none;
}
.upload-drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* ── Preview panel ────────────────────────────────────────────── */
.preview-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.preview-stat-card {
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(255, 248, 240, 0.7);
  border: 1px solid rgba(157, 91, 45, 0.12);
}
.preview-stat-card h3 {
  margin: 4px 0 2px;
  font-size: 1.25rem;
}
.preview-stat-card p {
  margin: 0;
  font-size: 0.78rem;
  color: #75665d;
}
.diag-line { margin-top: 6px !important; }
.diag-ok  { color: #4a7c59; font-weight: 600; font-size: 0.78rem; }
.diag-miss { color: #b04040; font-weight: 600; font-size: 0.78rem; }

.preview-skipped-block {
  margin-bottom: 16px;
  border: 1px solid rgba(176, 64, 64, 0.25);
  border-radius: 12px;
  overflow: hidden;
}
.preview-skipped-label {
  margin: 0;
  padding: 10px 14px;
  background: rgba(176, 64, 64, 0.07);
  font-size: 0.82rem;
  font-weight: 600;
  color: #b04040;
  cursor: pointer;
}
.preview-skipped-list {
  padding: 8px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.skipped-line {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 6px 10px;
  font-size: 0.8rem;
}
.skipped-tag {
  grid-row: span 2;
  align-self: center;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(176, 64, 64, 0.1);
  color: #b04040;
  font-weight: 700;
  font-size: 0.72rem;
  text-align: center;
}
.skipped-text {
  color: #3a2e2a;
  word-break: break-all;
  font-family: monospace;
}
.skipped-hint {
  color: #75665d;
  font-size: 0.75rem;
}

.preview-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 8px;
}
.preview-actions .primary-button {
  flex: 0 0 auto;
  width: auto;
  padding: 0 2rem;
  min-height: 2.6rem;
  font-size: 0.9rem;
}

/* ── 手机端专用样式（≤ 480px）────────────────────────────────── */
@media (max-width: 480px) {
  :root {
    --page-frame-gap: 8px;
    --mobile-frame-gap: 8px;
  }

  /* 页面容器 */
  .page-shell {
    width: 100%;
    padding: var(--mobile-frame-gap) 0 0;
  }

  /* 卡片圆角收小 */
  .hero,
  .library-section,
  .generator-card,
  .accordion-section,
  .request-group-card {
    border-radius: 18px;
  }

  /* Hero */
  .hero {
    padding: 16px 14px;
  }

  .home-request-insights {
    gap: 12px;
    padding-top: 18px;
  }

  .home-insight-card {
    min-height: 0;
    padding: 16px 14px;
    border-radius: 18px;
  }

  .home-insight-head {
    align-items: start;
  }

  .home-topic-bar-row {
    grid-template-columns: 1fr auto;
    gap: 8px 10px;
  }

  .home-topic-bar-track {
    grid-column: 1 / -1;
  }

  .home-category-pie-chart {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .home-category-legend {
    width: 100%;
  }

  /* ── Topbar ──────────────────────────────── */
  /* 整体用相对定位，inbox 绝对定位到右上角 */
  .topbar {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 10px;
    position: relative;
  }

  .brand {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .brand-stack {
    margin-left: 0;
    gap: 2px;
    align-items: flex-start;
  }

  .brand-image {
    width: 48px;
    height: 48px;
    border-radius: 12px;
  }

  /* 山风英语：强制单行 */
  .brand-subtitle {
    width: auto !important;
    white-space: nowrap !important;
    font-size: 0.8rem;
    text-align: left;
  }

  .brand-copy h1 {
    font-size: 1.3rem;
    line-height: 1.2;
  }

  /* 三个导航按钮一排居中，inbox 移右上角绝对定位 */
  .topbar-links {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    justify-content: center;
    padding-right: 52px; /* 给 inbox 留位 */
  }

  .topbar-nav-link {
    display: inline-flex; /* 手机端恢复显示 */
    align-items: center;
    justify-content: center;
    padding: 9px 14px;
    font-size: 0.88rem;
    cursor: pointer;
    /* 与主题导航按钮颜色区分：用更明显的橙色边框 */
    border-color: color-mix(in srgb, var(--accent-deep) 28%, var(--line));
    color: var(--accent-deep);
  }

  .topbar-nav-link:visited {
    color: var(--accent-deep);
  }

  /* inbox 移到右上角 */
  .inbox-button {
    width: 40px;
    height: 40px;
    position: absolute;
    top: 0;
    right: 0;
  }

  /* hero-metric 左边与公告栏标题对齐（公告栏 padding 14px） */
  .hero-metric-line {
    padding-left: 0;
    margin-left: 0;
  }

  /* Hero 数字 */
  .hero-metric-line strong {
    font-size: 2.8rem;
  }

  .panel-label {
    font-size: 1.25rem;
  }

  /* 公告栏列表：手机不需要内部滚动 */
  .notice-list {
    overflow: clip;
    max-height: none;
  }


  /* ── 公告栏：去除嵌套感 ─────────────────── */
  .notice-board-inline {
    padding: 14px 14px 10px;
  }

  .notice-item {
    border-color: var(--line);
    background: rgba(255, 255, 255, 0.6);
    border-radius: 14px;
    padding: 10px 12px;
  }

  /* ── Library section：重排顺序 ──────────── */
  /*
   * 目标顺序：主题资料库标题 → 主题导航 → 导出按钮 → 背诵模式 → 详情
   * 方案：library-section 用 flex，
   *       用 display:contents 展平中间层级，再用 order 排序
   */
  .library-section {
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  /* 展平 section-head（含标题div + library-tools） */
  .library-section > .section-head {
    display: contents;
  }

  /* 展平 section-head 内第一个 div（含 kicker + library-title-row） */
  .library-section > .section-head > div:first-child {
    display: contents;
  }

  /* 展平 library-title-row（含 h2 + export-actions） */
  .library-section .library-title-row {
    display: contents;
  }

  /* 展平 library-layout（含 sidebar + detail） */
  .library-section > .library-layout {
    display: contents;
  }

  /* 排序 */
  .library-section .section-kicker  { order: 1; }
  .library-section h2                { order: 2; font-size: 1.7rem; }
  .library-section .topic-sidebar    { order: 3; position: static; max-height: none; }
  .library-section .library-export-actions { order: 4; }
  .library-section .library-tools    { order: 5; padding-inline: 0; }
  .library-section #topic-detail     { order: 6; }

  /* 导出按钮：同一行 */
  .library-export-actions {
    display: flex;
    flex-direction: row;
    gap: 8px;
    width: 100%;
  }

  .export-button {
    flex: 1;
    padding: 10px 6px;
    font-size: 0.9rem;
    text-align: center;
    white-space: nowrap;
  }

  /* 背诵模式：四个按钮同一行 */
  .mode-group {
    display: flex !important;
    flex-wrap: nowrap !important;
    gap: 6px;
    width: 100%;
  }

  .mode-button {
    flex: 1;
    padding: 9px 4px;
    font-size: 0.82rem;
    text-align: center;
    min-width: 0;
    white-space: nowrap;
  }

  /* 主题导航 */
  .topic-list-shell {
    height: 38vh;
  }

  .topic-button {
    min-height: 52px;
    padding: 12px 14px 12px 18px;
    border-color: var(--line);
  }

  .topic-title {
    font-size: 1rem;
  }

  /* 详情标题 */
  .detail-head h3 {
    font-size: 1.5rem;
  }

  /* 词汇/短语/句子：单列 */
  .word-grid,
  .phrase-grid,
  .sentence-grid {
    grid-template-columns: 1fr;
  }

  .word-entry-list-wide {
    grid-template-columns: 1fr;
  }

  /* 手风琴 */
  .accordion-summary {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .accordion-body {
    padding: 0 14px 14px;
  }

  /* 单词/短语/句子字号缩小 */
  .pair-line.primary,
  .pair-line.single {
    font-size: 0.9rem;
    line-height: 1.55;
  }

  .word-entry .pair-line.secondary:first-of-type,
  .word-main .pair-line.secondary:first-of-type {
    font-size: 0.85rem;
    line-height: 1.5;
  }

  .pair-line.secondary {
    font-size: 0.8rem;
    line-height: 1.6;
  }

  .word-meta {
    font-size: 0.78rem;
    line-height: 1.6;
  }

  .word-card h5,
  .sentence-card h5 {
    font-size: 0.92rem;
    margin-bottom: 6px;
  }

  .word-card,
  .phrase-card,
  .sentence-card {
    padding: 12px 14px;
    border-radius: 16px;
  }

  /* 练习卡片：关掉 contain，避免安卓把卡片当作独立滚动根吞掉手势 */
  .generator-card {
    padding: 16px 0;
    gap: 14px;
    border-radius: 18px;
    contain: none;
  }

  /* 手机端整页关掉 contain / content-visibility，
     这两个在安卓上会导致慢速滚动时布局跳动、手势被吞 */
  .page-shell,
  .library-section,
  .topic-sidebar,
  .topic-detail,
  .request-group-card,
  .notice-item,
  .workflow-card,
  .workflow-section,
  .generator-card {
    contain: none;
    content-visibility: visible;
    contain-intrinsic-size: auto;
  }

  .accordion-section {
    contain: none;
    content-visibility: visible;
    contain-intrinsic-size: auto;
  }

  .generator-card h3 {
    font-size: 1.5rem;
  }

  /* 表达还原：中文/英文字号缩小，框两侧留白 */
  .restoration-clue {
    font-size: 0.9rem;
    line-height: 1.6;
  }

  .restoration-clue-box,
  .challenge-prompt-box {
    margin-inline: var(--card-content-rail);
  }

  .challenge-prompt-box h4 {
    font-size: 0.95rem;
    line-height: 1.55;
  }

  /* 掌握度：修复布局和滚动陷阱 */
  .mastery-panel {
    overflow: visible;
    border-radius: 20px;
  }

  .mastery-layout {
    grid-template-columns: 1fr !important;
    padding: 0 12px 14px;
  }

  .mastery-sidebar {
    min-width: 0;
    overflow: clip; /* clip 不创建 scroll container，不会吞掉安卓触摸手势 */
  }

  .mastery-topic-list {
    display: flex;
    flex-wrap: wrap; /* wrap 后不会溢出，clip 不需要滚动容器 */
    overflow: clip;
    max-height: none;
    width: 100%;
  }

  .mastery-topic-button {
    min-width: 0;
    overflow: clip;
    flex-shrink: 0;
    max-width: 100%;
  }

  .mastery-topic-button .topic-title {
    overflow: clip;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
  }

  /* 按钮行竖向排列 */
  .challenge-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .challenge-actions .topbar-link,
  .challenge-actions .submit-button {
    width: 100%;
    text-align: center;
  }

  /* 掌握度：竖向 */
  .mastery-display {
    grid-template-columns: 1fr;
  }

  .mastery-ring {
    width: 160px;
    height: 160px;
  }

  .mastery-ring-center {
    width: 112px;
    height: 112px;
  }

  .mastery-ring-center strong {
    font-size: 1.6rem;
  }

  /* 提交按钮全宽 */
  .submit-button {
    width: calc(100% - 36px);
    text-align: center;
  }

  /* 表单输入框 */
  #challenge-answer-input,
  #restoration-answer-input,
  #request-topic-input,
  #paper-request-name-input,
  .feedback-select,
  .request-note {
    padding: 14px 16px;
    font-size: 1rem;
    border-radius: 16px;
  }

  /* 文本框内部不需要独立滚动，避免安卓吞掉页面手势 */
  .request-note {
    overflow: hidden;
    resize: none;
  }

  /* generator-card 内输入框：手机统一用 calc 宽度，防止右侧溢出 */
  .generator-card > input,
  .generator-card > select,
  .generator-card > textarea,
  .generator-card > .paper-upload-box,
  .embedded-request-block > input,
  .embedded-request-block > select,
  .embedded-request-block > textarea,
  .embedded-request-block > .paper-upload-box {
    width: calc(100% - (var(--card-content-rail) * 2)) !important;
    margin-inline: var(--card-content-rail) !important;
    box-sizing: border-box;
  }

  /* 后续计划：单列 */
  .workflow-grid {
    grid-template-columns: 1fr;
  }

  /* 图片上传区 */
  .paper-upload-box {
    min-height: 120px;
  }
}

/* ── 横屏补丁 ─────────────────────────────── */
@media (max-width: 480px) and (orientation: landscape) {
  .topic-list-shell {
    height: 55vw;
  }
}

/* ── Tab 页切换 ───────────────────────────────
 * 默认隐藏所有 tab-page，
 * body[data-tab="x"] 时只显示对应页
 * ─────────────────────────────────────────── */
.tab-page {
  display: none;
  padding-bottom: calc(var(--bottom-nav-safe-height) + var(--page-frame-gap));
}

body[data-tab="home"]     .tab-page[data-tab="home"],
body[data-tab="library"]  .tab-page[data-tab="library"],
body[data-tab="practice"] .tab-page[data-tab="practice"],
body[data-tab="submit"]   .tab-page[data-tab="submit"],
body[data-tab="feedback"] .tab-page[data-tab="feedback"] {
  display: block;
}

body[data-tab="home"] .tab-page[data-tab="home"],
body[data-tab="feedback"] .tab-page[data-tab="feedback"] {
  display: flex;
  flex-direction: column;
  padding-bottom: var(--page-frame-gap);
  min-height: calc(100vh - var(--bottom-nav-safe-height) - (var(--page-frame-gap) * 2));
  min-height: calc(100dvh - var(--bottom-nav-safe-height) - (var(--page-frame-gap) * 2));
}

body[data-tab="home"] .tab-page[data-tab="home"] > .hero,
body[data-tab="feedback"] .tab-page[data-tab="feedback"] > .generator-card {
  flex: 1 1 auto;
}

body[data-tab="feedback"] #feedback-box .submit-button,
body[data-tab="feedback"] #feedback-box .request-link {
  width: fit-content;
}

/* ── 底部导航栏 ───────────────────────────────*/
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background: var(--panel);
  border-top: 1px solid var(--line);
  display: flex;
  z-index: 200;
  /* 兼容 iPhone 底部安全区 */
  padding-bottom: env(safe-area-inset-bottom, 0px);
  box-shadow: 0 -4px 16px rgba(91, 67, 44, 0.07);
}

.bottom-nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border: none;
  background: none;
  color: var(--muted);
  font-size: 0.68rem;
  font-family: var(--font-body);
  font-weight: 500;
  cursor: pointer;
  padding: 6px 0 4px;
  -webkit-tap-highlight-color: transparent;
  transition: color 120ms ease;
}

.bottom-nav-icon {
  width: 22px;
  height: 22px;
  display: block;
  flex-shrink: 0;
}

/* 当前激活项高亮 */
body[data-tab="home"]     .bottom-nav-btn[data-tab="home"],
body[data-tab="library"]  .bottom-nav-btn[data-tab="library"],
body[data-tab="practice"] .bottom-nav-btn[data-tab="practice"],
body[data-tab="submit"]   .bottom-nav-btn[data-tab="submit"],
body[data-tab="feedback"] .bottom-nav-btn[data-tab="feedback"] {
  color: var(--accent-deep);
}

/* 手机收起浮动按钮 */
.mobile-collapse-fab {
  display: none;
}

@media (max-width: 480px) {
  .mobile-collapse-fab {
    display: block;
    position: fixed;
    bottom: 24px;
    right: 18px;
    z-index: 999;
    background: var(--accent-deep);
    color: #fff;
    border: none;
    border-radius: 999px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 700;
    box-shadow: 0 6px 20px rgba(0,0,0,0.22);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-collapse-fab[hidden] {
    display: none !important;
  }
}