/* 拾题 · Web MVP
   同一套界面，四套全局主题。主题只改变设计令牌，不复制页面。 */

* { box-sizing: border-box; }
html, body { margin: 0; width: 100%; min-height: 100%; }
body {
  --stage: #dfe4e5;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
  background: var(--stage);
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
}
button, input, textarea, select { font: inherit; }
button { color: inherit; }
svg { display: block; }
h1, h2, h3, p { margin: 0; }
button:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ============ 应用外壳 ============ */
.app {
  --bg: #f4f2ec;
  --surface: #fffefa;
  --surface-2: #edf4ef;
  --surface-3: #e4eee8;
  --text: #17241f;
  --text-soft: #43524b;
  --muted: #7b847f;
  --accent: #17775a;
  --accent-rgb: 23, 119, 90;
  --accent-2: #dcece4;
  --border: rgba(27, 53, 42, .09);
  --border-strong: rgba(27, 53, 42, .16);
  --shadow: 0 12px 30px rgba(44, 55, 45, .07);
  --shadow-lift: 0 20px 48px rgba(28, 45, 37, .15);
  --nav: rgba(255, 254, 250, .89);
  --sheet: #fffefa;
  --danger: #b94d42;
  --danger-soft: #f8e8e4;
  --success: #17775a;
  --success-soft: #e7f3ec;
  --warning: #a26d1f;
  --warning-soft: #fbf2dd;
  --ring-track: #e8ece8;
  --radius: 24px;
  --font-title: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  position: relative;
  width: 390px;
  height: 844px;
  flex: 0 0 390px;
  border-radius: 38px;
  overflow: hidden;
  color: var(--text);
  background: var(--bg);
  box-shadow: 0 30px 80px rgba(25, 35, 35, .24), 0 0 0 1px rgba(16, 26, 24, .08);
  isolation: isolate;
  display: flex;
  flex-direction: column;
}
.app.glass { color-scheme: dark; }
.ambient { position: absolute; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.ambient::before, .ambient::after { content: ""; position: absolute; }
.app-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 9px 20px 96px;
  position: relative;
  z-index: 2;
  scrollbar-width: none;
}
.app-scroll::-webkit-scrollbar { display: none; }
.app.flow-mode .app-scroll { padding-bottom: 32px; }
.app.flow-mode .bottom-nav { display: none; }
.statusbar {
  height: 34px;
  flex: 0 0 34px;
  padding: 9px 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  line-height: 1;
  font-weight: 650;
  letter-spacing: .1px;
  position: relative;
  z-index: 5;
}
.status-icons { display: flex; align-items: center; gap: 6px; }
.battery {
  width: 21px; height: 10px; border: 1.3px solid currentColor; border-radius: 3px;
  padding: 1.5px; position: relative; opacity: .9;
}
.battery::before { content: ""; display: block; width: 78%; height: 100%; border-radius: 1px; background: currentColor; }
.battery::after { content: ""; position: absolute; right: -3px; top: 2.5px; width: 1.5px; height: 4px; border-radius: 0 2px 2px 0; background: currentColor; }
.gesture { position: absolute; z-index: 50; bottom: 5px; left: 50%; transform: translateX(-50%); width: 104px; height: 3px; border-radius: 5px; background: var(--text); opacity: .24; pointer-events: none; }
#view > * { animation: view-rise .42s cubic-bezier(.22,1,.36,1) both; }
@keyframes view-rise { from { opacity: 0; transform: translateY(7px); } to { opacity: 1; transform: translateY(0); } }

/* ============ 通用控件 ============ */
.appbar { height: 44px; display: flex; align-items: center; justify-content: space-between; }
.appbar-right { display: flex; align-items: center; gap: 8px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 35px; height: 35px; border-radius: 12px; display: grid; place-items: center;
  color: var(--accent); background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
}
.brand-name { font-family: var(--font-title); font-size: 18px; font-weight: 720; letter-spacing: .5px; line-height: 1.1; }
.brand-sub { font-size: 8px; letter-spacing: 1.65px; color: var(--muted); margin-top: 4px; text-transform: uppercase; }
.icon-button {
  appearance: none; -webkit-appearance: none; border: 1px solid var(--border);
  width: 35px; height: 35px; border-radius: 50%; display: grid; place-items: center;
  color: var(--text); background: var(--surface); cursor: pointer; box-shadow: var(--shadow);
  transition: transform .22s cubic-bezier(.22,1,.36,1), border-color .22s ease, background .22s ease;
}
.icon-button:hover { border-color: rgba(var(--accent-rgb), .35); }
.icon-button:active { transform: scale(.93); }
.theme-trigger {
  appearance: none; -webkit-appearance: none; height: 35px; padding: 0 11px;
  display: inline-flex; align-items: center; gap: 5px; white-space: nowrap;
  color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 18px; box-shadow: var(--shadow); font-size: 9px; font-weight: 650;
  cursor: pointer; transition: transform .2s ease, border-color .3s ease, background .3s ease;
}
.theme-trigger:hover { border-color: rgba(var(--accent-rgb), .35); }
.theme-trigger:active { transform: scale(.95); }
.theme-trigger svg { color: var(--accent); }
.avatar {
  appearance: none; -webkit-appearance: none; padding: 0; cursor: pointer;
  width: 35px; height: 35px; border-radius: 50%; display: grid; place-items: center;
  color: var(--text); background: var(--surface); border: 1px solid var(--border); position: relative;
}
.avatar::after { content: ""; position: absolute; width: 7px; height: 7px; right: -1px; bottom: 1px; border-radius: 50%; background: var(--accent); border: 2px solid var(--bg); }
.page-heading { margin: 15px 0 15px; display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; }
.page-kicker { font-size: 8px; letter-spacing: 1.9px; color: var(--accent); font-weight: 750; text-transform: uppercase; margin-bottom: 6px; }
.page-title { font-family: var(--font-title); font-size: 29px; line-height: 1.12; letter-spacing: -.7px; font-weight: 760; }
.page-sub { color: var(--muted); font-size: 10px; margin-top: 7px; line-height: 1.6; }
.eyebrow { color: var(--accent); font-size: 8px; font-weight: 750; letter-spacing: 2px; text-transform: uppercase; }
.section-title { font-size: 13px; font-weight: 720; letter-spacing: .1px; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-top: 17px; height: 19px; }
.section-link { appearance: none; border: 0; background: transparent; padding: 0; font-size: 9px; color: var(--muted); display: flex; align-items: center; gap: 2px; cursor: pointer; }
.pill {
  display: inline-flex; align-items: center; gap: 4px; min-height: 19px; padding: 2px 8px;
  border-radius: 20px; background: var(--surface-2); color: var(--accent); font-size: 8px; font-weight: 650;
  white-space: nowrap;
}
.tag {
  display: inline-flex; align-items: center; min-height: 18px; padding: 2px 7px;
  border-radius: 7px; background: var(--surface-2); color: var(--text-soft); font-size: 8px; font-weight: 600;
}
.status { display: inline-flex; align-items: center; gap: 4px; font-size: 8px; font-weight: 650; }
.status::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.status.due { color: var(--danger); }
.status.learning { color: var(--warning); }
.status.mastered { color: var(--success); }
.btn {
  appearance: none; -webkit-appearance: none; border: 1px solid transparent; border-radius: 14px;
  min-height: 43px; padding: 0 16px; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font-size: 11px; font-weight: 700; cursor: pointer;
  transition: transform .2s cubic-bezier(.22,1,.36,1), filter .2s ease, border-color .2s ease, background .2s ease;
}
.btn:active { transform: scale(.975); }
.btn.primary { background: var(--accent); color: #fff; box-shadow: 0 10px 24px rgba(var(--accent-rgb), .2); }
.btn.primary:hover { filter: brightness(1.04); }
.btn.secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn.ghost { background: transparent; color: var(--muted); border-color: var(--border); }
.btn.danger { background: var(--danger-soft); color: var(--danger); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn.block { width: 100%; }
.btn.small { min-height: 34px; border-radius: 11px; font-size: 9px; padding: 0 11px; }
.hidden-input { display: none !important; }
.muted { color: var(--muted); }
.empty-state {
  padding: 36px 20px; border-radius: var(--radius); border: 1px dashed var(--border-strong);
  background: rgba(255,255,255,.16); text-align: center; color: var(--muted);
}
.empty-state .empty-icon {
  width: 52px; height: 52px; margin: 0 auto 13px; border-radius: 18px;
  display: grid; place-items: center; color: var(--accent); background: var(--surface-2);
}
.empty-state h3 { color: var(--text); font-size: 14px; margin-bottom: 6px; }
.empty-state p { font-size: 10px; line-height: 1.65; }
.empty-state .btn { margin-top: 16px; }

/* ============ 首页 ============ */
.hero-actions { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; height: 158px; margin-top: 18px; }
.hero-card {
  position: relative; overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 15px 14px; background: var(--surface); color: var(--text); box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: stretch; min-width: 0; cursor: pointer; text-align: left;
  transition: transform .24s cubic-bezier(.22,1,.36,1), box-shadow .24s ease, border-color .24s ease;
}
.hero-card:hover { transform: translateY(-2px); }
.hero-card:active { transform: scale(.982); }
.hero-card.scan-card { color: #fff; border-color: transparent; background: var(--accent); }
.hero-top { display: flex; align-items: flex-start; justify-content: space-between; }
.hero-icon { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; color: var(--accent); background: var(--surface-2); }
.scan-card .hero-icon { color: #fff; background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.13); }
.hero-arrow { width: 25px; height: 25px; border-radius: 50%; display: grid; place-items: center; color: var(--muted); background: var(--surface-2); }
.scan-card .hero-arrow { color: #fff; background: rgba(255,255,255,.13); }
.hero-title { margin-top: auto; font-size: 17px; font-weight: 720; letter-spacing: .1px; }
.hero-desc { margin-top: 5px; font-size: 9px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.scan-card .hero-desc { color: rgba(255,255,255,.72); }
.review-card {
  width: 100%; height: 137px; margin-top: 15px; border-radius: var(--radius); padding: 16px;
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
  position: relative; overflow: hidden; text-align: left; cursor: pointer;
  transition: transform .24s cubic-bezier(.22,1,.36,1), border-color .24s ease;
}
.review-card:hover { transform: translateY(-1px); border-color: rgba(var(--accent-rgb), .25); }
.review-head { display: flex; justify-content: space-between; align-items: center; }
.review-body { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; }
.review-count { display: flex; align-items: baseline; gap: 5px; }
.review-count strong { font-size: 32px; line-height: 1; letter-spacing: -1.5px; }
.review-count span { font-size: 11px; color: var(--muted); }
.review-meta { margin-top: 7px; font-size: 9px; color: var(--muted); }
.review-cta { display: flex; align-items: center; gap: 5px; margin-top: 10px; font-size: 10px; color: var(--accent); font-weight: 700; }
.progress-ring {
  width: 66px; height: 66px; border-radius: 50%; padding: 6px; margin-right: 3px;
  background: conic-gradient(var(--accent) 0 var(--progress, 0%), var(--ring-track) var(--progress, 0%) 100%);
  transform: rotate(-35deg); flex: 0 0 auto;
}
.ring-inner { width: 100%; height: 100%; border-radius: 50%; background: var(--surface); display: grid; place-items: center; transform: rotate(35deg); }
.ring-inner strong { font-size: 15px; line-height: 1; }
.ring-inner span { font-size: 7px; color: var(--muted); margin-top: -12px; }
.topics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 9px; }
.topic {
  min-width: 0; height: 67px; border-radius: 18px; border: 1px solid var(--border); background: var(--surface);
  padding: 11px 12px; display: flex; align-items: center; gap: 10px; cursor: pointer; text-align: left;
  transition: transform .22s ease, border-color .22s ease;
}
.topic:hover { transform: translateY(-1px); border-color: rgba(var(--accent-rgb), .25); }
.topic-icon { width: 32px; height: 32px; border-radius: 11px; display: grid; place-items: center; color: var(--accent); background: var(--surface-2); flex: 0 0 auto; }
.topic-name { font-size: 11px; font-weight: 700; }
.topic-meta { margin-top: 5px; font-size: 8px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mini-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; margin-top: 15px; }
.metric-card { border: 1px solid var(--border); border-radius: 17px; background: var(--surface); padding: 11px 10px; min-width: 0; }
.metric-value { font-size: 20px; line-height: 1; font-weight: 760; letter-spacing: -.7px; }
.metric-value small { font-size: 8px; font-weight: 600; color: var(--muted); margin-left: 2px; letter-spacing: 0; }
.metric-label { margin-top: 5px; color: var(--muted); font-size: 8px; }
.home-footnote { text-align: center; margin: 18px 0 2px; font-size: 8px; color: var(--muted); }
.home-footnote svg { display: inline-block; vertical-align: -1px; }

.app.has-paper-dock .app-scroll { padding-bottom: 164px; }
.paper-dock {
  position: absolute; z-index: 44; left: 14px; right: 14px; bottom: 90px;
  min-height: 56px; padding: 9px 9px 9px 14px; border-radius: 19px;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: var(--text); color: var(--bg); box-shadow: 0 16px 36px rgba(8, 18, 14, .22);
  opacity: 0; transform: translateY(12px); pointer-events: none;
  transition: opacity .26s ease, transform .32s cubic-bezier(.22,1,.36,1);
}
.paper-dock.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.paper-dock-copy { min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.paper-dock-copy strong { font-size: 12px; line-height: 1.15; font-weight: 700; }
.paper-dock-copy span { font-size: 8px; opacity: .62; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.paper-dock .btn { flex: 0 0 auto; min-height: 38px; padding: 0 13px; background: var(--accent); color: #fff; border-radius: 12px; box-shadow: none; }
.paper-dock .btn svg { flex: 0 0 auto; }

/* 底部导航 */
.bottom-nav {
  position: absolute; z-index: 40; left: 14px; right: 14px; bottom: 13px; height: 67px;
  border-radius: 23px; background: var(--nav); border: 1px solid var(--border);
  box-shadow: 0 12px 36px rgba(20,30,25,.1);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); padding: 8px 7px 7px;
}
.nav-item {
  appearance: none; border: 0; background: transparent; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px; color: var(--muted); font-size: 8px;
  position: relative; cursor: pointer; border-radius: 14px; min-width: 0; padding: 0;
}
.nav-item.active { color: var(--accent); font-weight: 700; }
.nav-item.active::before { content: ""; position: absolute; top: -8px; width: 18px; height: 2px; border-radius: 4px; background: var(--accent); }
.nav-item:active { background: var(--surface-2); }

/* ============ 题库 ============ */
.library-tools { display: flex; flex-direction: column; gap: 10px; margin-bottom: 13px; }
.search-wrap {
  height: 42px; border-radius: 13px; border: 1px solid var(--border); background: var(--surface);
  display: flex; align-items: center; gap: 9px; padding: 0 12px; box-shadow: var(--shadow);
}
.search-wrap svg { color: var(--muted); flex: 0 0 auto; }
.search-wrap input { flex: 1; min-width: 0; border: 0; outline: 0; color: var(--text); background: transparent; font-size: 10px; }
.search-wrap input::placeholder { color: var(--muted); }
.filter-row { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; padding-bottom: 1px; }
.filter-row::-webkit-scrollbar { display: none; }
.filter-chip {
  appearance: none; border: 1px solid var(--border); background: var(--surface); color: var(--muted);
  padding: 0 11px; height: 29px; border-radius: 10px; font-size: 8px; white-space: nowrap; cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}
.filter-chip.active { color: var(--accent); background: var(--surface-2); border-color: rgba(var(--accent-rgb), .24); font-weight: 700; }
.library-summary { display: flex; justify-content: space-between; align-items: center; margin: 9px 1px 10px; font-size: 8px; color: var(--muted); }
.library-summary strong { color: var(--text); font-weight: 650; }
.question-list { display: flex; flex-direction: column; gap: 9px; }
.q-card {
  position: relative; display: flex; align-items: stretch; gap: 2px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow);
  transition: border-color .2s ease, transform .2s ease;
}
.q-card:hover { border-color: rgba(var(--accent-rgb), .23); }
.q-open {
  appearance: none; border: 0; background: transparent; color: var(--text); text-align: left;
  flex: 1; min-width: 0; padding: 13px 4px 12px 14px; cursor: pointer;
}
.q-card-top { display: flex; align-items: center; gap: 5px; flex-wrap: wrap; }
.q-title-text { font-size: 11px; line-height: 1.55; font-weight: 620; margin-top: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.q-foot { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; margin-top: 8px; color: var(--muted); font-size: 8px; }
.q-actions {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  flex: 0 0 auto; margin: 0 10px 0 2px;
}
.q-add, .q-delete {
  appearance: none; flex: 0 0 auto; width: 29px; height: 29px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--accent);
  display: grid; place-items: center; cursor: pointer;
  transition: transform .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.q-add:hover, .q-delete:hover { transform: translateY(-1px); }
.q-add.selected { background: var(--accent); color: #fff; border-color: transparent; }
.q-delete { color: var(--muted); background: transparent; }
.q-delete:hover { color: var(--danger); background: var(--danger-soft); border-color: transparent; }
.q-source { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 190px; }
.no-results { padding: 24px; font-size: 10px; color: var(--muted); text-align: center; }

/* ============ 扫描流程 ============ */
.flow-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 5px 0 18px; }
.flow-back {
  width: 36px; height: 36px; border-radius: 50%; background: var(--surface); border: 1px solid var(--border);
  color: var(--text); display: grid; place-items: center; cursor: pointer;
}
.flow-heading { flex: 1; min-width: 0; }
.flow-heading h1 { font-family: var(--font-title); font-size: 22px; letter-spacing: -.4px; }
.flow-step { font-size: 8px; color: var(--muted); margin-top: 4px; }
.demo-badge { color: var(--warning); background: var(--warning-soft); border-color: transparent; }
.dropzone {
  border: 1px dashed var(--border-strong); border-radius: 26px; background: var(--surface);
  min-height: 212px; padding: 24px 20px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; position: relative; overflow: hidden; box-shadow: var(--shadow);
}
.dropzone-art {
  width: 66px; height: 66px; border-radius: 22px; display: grid; place-items: center;
  color: var(--accent); background: var(--surface-2); margin-bottom: 15px;
}
.dropzone h2 { font-size: 15px; font-weight: 720; }
.dropzone p { font-size: 9px; color: var(--muted); line-height: 1.7; margin-top: 7px; max-width: 230px; }
.file-hit { position: relative; display: inline-flex; align-items: center; justify-content: center; }
.file-hit > .btn, .file-hit > .section-link { pointer-events: none; }
.file-hit input[type="file"] { position: absolute; inset: 0; z-index: 3; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.file-hit-small { vertical-align: middle; }
.dropzone-actions { display: flex; gap: 8px; margin-top: 16px; }
.ocr-badge { color: var(--accent); background: var(--surface-2); }
.scan-error {
  display: flex; align-items: flex-start; gap: 8px; margin: 0 0 12px; padding: 11px 12px;
  border-radius: 14px; background: var(--danger-soft); color: var(--danger); font-size: 9px; line-height: 1.65;
}
.scan-error svg { flex: 0 0 auto; margin-top: 1px; }
.ocr-connection {
  display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 12px;
  padding: 10px 12px; border-radius: 13px; background: var(--warning-soft); color: var(--warning);
  font-size: 8px; line-height: 1.5;
}
.ocr-connection.ready { background: var(--surface-2); color: var(--accent); }
.ocr-connection span { display: flex; align-items: center; gap: 6px; min-width: 0; }
.ocr-connection button {
  appearance: none; border: 1px solid currentColor; background: transparent; color: inherit;
  border-radius: 9px; padding: 5px 8px; font-size: 8px; font-weight: 650; cursor: pointer; flex: 0 0 auto;
}
.scan-tip {
  display: flex; gap: 8px; align-items: flex-start; margin-top: 12px; padding: 11px 12px;
  background: var(--surface-2); border-radius: 14px; color: var(--text-soft); font-size: 8px; line-height: 1.65;
}
.scan-tip svg { color: var(--accent); flex: 0 0 auto; margin-top: 1px; }
.page-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; margin-top: 13px; }
.page-thumb {
  position: relative; aspect-ratio: 3 / 4; border-radius: 13px; overflow: hidden; background: #fbfaf6;
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.page-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.page-thumb .page-no {
  position: absolute; left: 5px; top: 5px; z-index: 2; padding: 2px 5px; border-radius: 5px;
  background: rgba(20,24,22,.62); color: #fff; font-size: 7px; line-height: 1.4;
}
.page-fallback {
  display: none; position: absolute; inset: 0; z-index: 1; padding: 18px 9px 9px;
  flex-direction: column; align-items: center; justify-content: center; gap: 7px;
  color: var(--muted); background: var(--surface-2); text-align: center; font-size: 7px; line-height: 1.45;
}
.page-fallback svg { color: var(--accent); }
.page-fallback-name { color: var(--text-soft); font-weight: 650; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.page-thumb.preview-failed .page-fallback { display: flex; }
.page-thumb.preview-failed img { display: none; }
.page-thumb .remove-page {
  position: absolute; right: 4px; top: 4px; z-index: 2; width: 20px; height: 20px; border: 0;
  border-radius: 50%; background: rgba(20,24,22,.62); color: #fff; display: grid; place-items: center; cursor: pointer;
}
.sample-page {
  width: 100%; height: 100%; padding: 28px 11px 15px; background: #fffdf7; color: #8b857a;
  display: flex; flex-direction: column; gap: 5px;
}
.sample-page .sample-head { font-size: 8px; font-weight: 700; color: #514d46; margin-bottom: 2px; }
.sample-page .sample-line { height: 3px; border-radius: 2px; background: #ded8cd; }
.sample-page .sample-line.short { width: 62%; }
.sample-page .sample-line.long { width: 92%; }
.sample-page .sample-box { height: 24px; border: 1px solid #e7ded0; border-radius: 3px; margin-top: 2px; }
.page-dock-head { display: flex; align-items: center; justify-content: space-between; margin-top: 17px; }
.scan-actions { display: flex; gap: 8px; margin-top: 12px; }
.scan-actions .btn { flex: 1; }
.scan-progress-card {
  margin-top: 14px; padding: 18px; border-radius: 22px; background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.scan-visual {
  height: 102px; border-radius: 16px; background: var(--surface-2); position: relative; overflow: hidden; margin-bottom: 14px;
}
.scan-visual::before {
  content: ""; position: absolute; left: 13px; right: 13px; top: 14px; bottom: 14px;
  border-radius: 8px; border: 1px solid rgba(var(--accent-rgb), .2);
  background: repeating-linear-gradient(to bottom, rgba(var(--accent-rgb), .08) 0 3px, transparent 3px 11px);
}
.scan-beam {
  position: absolute; left: 10px; right: 10px; height: 2px; top: 12px;
  background: var(--accent); box-shadow: 0 0 16px var(--accent); animation: scan-beam 1.25s ease-in-out infinite alternate;
}
@keyframes scan-beam { from { top: 14px; } to { top: calc(100% - 16px); } }
.progress-track { height: 5px; border-radius: 4px; background: var(--ring-track); overflow: hidden; }
.progress-fill { height: 100%; width: 0; border-radius: 4px; background: var(--accent); transition: width .25s ease; }
.progress-caption { display: flex; justify-content: space-between; margin-top: 8px; font-size: 8px; color: var(--muted); }
.selection-summary {
  display: flex; align-items: flex-start; gap: 9px; margin-top: 14px; padding: 12px;
  background: var(--surface-2); border-radius: 14px; color: var(--text-soft); font-size: 8px; line-height: 1.65;
}
.selection-summary svg { color: var(--accent); flex: 0 0 auto; margin-top: 1px; }
.candidate-list { display: flex; flex-direction: column; gap: 9px; margin-top: 12px; }
.candidate-card {
  width: 100%; text-align: left; position: relative; padding: 13px; border-radius: 17px;
  background: var(--surface); border: 1px solid var(--border); cursor: pointer;
  transition: border-color .2s ease, background .2s ease;
}
.candidate-card.selected { border-color: rgba(var(--accent-rgb), .52); box-shadow: 0 0 0 2px rgba(var(--accent-rgb), .08); }
.candidate-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.candidate-page { font-size: 8px; color: var(--muted); }
.candidate-check {
  width: 19px; height: 19px; border-radius: 6px; border: 1px solid var(--border-strong);
  display: grid; place-items: center; color: #fff; flex: 0 0 auto;
}
.candidate-card.selected .candidate-check { background: var(--accent); border-color: var(--accent); }
.candidate-title { margin-top: 8px; font-size: 11px; line-height: 1.55; font-weight: 620; padding-right: 4px; }
.candidate-meta { margin-top: 7px; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.confidence { font-size: 8px; color: var(--muted); }
.confidence strong { color: var(--accent); }
.select-footer {
  position: sticky; bottom: -1px; z-index: 6; margin: 16px -20px 0; padding: 12px 20px 22px;
  background: linear-gradient(to bottom, transparent, var(--bg) 32%); display: flex; gap: 8px; align-items: center;
}
.select-footer .btn { flex: 1; }
.select-all { font-size: 9px; color: var(--muted); padding: 8px 2px; background: transparent; border: 0; cursor: pointer; white-space: nowrap; }
.flow-note { margin-top: 10px; font-size: 8px; line-height: 1.65; color: var(--muted); text-align: center; }

/* ============ 复习 ============ */
.review-meta-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 13px; }
.review-progress { height: 5px; background: var(--ring-track); border-radius: 4px; overflow: hidden; margin: 0 0 17px; }
.review-progress > span { display: block; height: 100%; background: var(--accent); border-radius: 4px; transition: width .3s ease; }
.review-question-card {
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  box-shadow: var(--shadow); padding: 18px 16px 16px;
}
.review-source { font-size: 8px; color: var(--muted); margin-bottom: 9px; }
.review-chapter { display: flex; gap: 5px; flex-wrap: wrap; margin-bottom: 11px; }
.review-title { font-size: 17px; line-height: 1.65; font-weight: 600; letter-spacing: .1px; }
.review-prompt {
  margin-top: 15px; padding: 11px 12px; border-radius: 13px; background: var(--surface-2);
  color: var(--text-soft); font-size: 9px; line-height: 1.65; display: flex; gap: 8px;
}
.review-prompt svg { color: var(--accent); flex: 0 0 auto; margin-top: 1px; }
.answer-block { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 15px; animation: view-rise .35s both; }
.answer-label { font-size: 8px; font-weight: 750; letter-spacing: 1.4px; color: var(--accent); text-transform: uppercase; margin-bottom: 6px; }
.answer-text { font-size: 12px; line-height: 1.7; font-weight: 650; }
.explanation { margin-top: 11px; color: var(--text-soft); font-size: 10px; line-height: 1.8; }
.answer-hidden {
  margin-top: 16px; border-top: 1px dashed var(--border-strong); padding-top: 15px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.answer-hidden p { color: var(--muted); font-size: 9px; line-height: 1.6; }
.review-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px; }
.review-actions .btn { min-height: 42px; }
.review-done { text-align: center; padding: 26px 14px 18px; }
.review-done-icon {
  width: 72px; height: 72px; margin: 0 auto 17px; border-radius: 50%; display: grid; place-items: center;
  color: var(--accent); background: var(--success-soft); border: 1px solid rgba(var(--accent-rgb), .15);
}
.review-done h2 { font-family: var(--font-title); font-size: 22px; }
.review-done p { color: var(--muted); font-size: 10px; line-height: 1.7; margin-top: 8px; }
.review-score { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 19px 0 5px; }
.review-score div { background: var(--surface); border: 1px solid var(--border); border-radius: 15px; padding: 12px 5px; }
.review-score strong { display: block; font-size: 20px; line-height: 1.1; }
.review-score span { display: block; font-size: 8px; color: var(--muted); margin-top: 5px; }

/* ============ 组卷 ============ */
.paper-toolbar { display: flex; gap: 9px; align-items: center; margin-bottom: 13px; }
.paper-toolbar .btn { flex: 1; }
.paper-summary { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 13px 14px; border-radius: 17px; background: var(--surface); border: 1px solid var(--border); margin-bottom: 13px; }
.paper-summary strong { font-size: 23px; letter-spacing: -1px; }
.paper-summary span { font-size: 9px; color: var(--muted); }
.paper-summary .paper-mode { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.switch-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 13px 14px; border: 1px solid var(--border); border-radius: 15px; background: var(--surface); margin-bottom: 13px; }
.switch-row-text { font-size: 10px; font-weight: 600; }
.switch-row small { display: block; font-size: 8px; color: var(--muted); margin-top: 4px; font-weight: 400; }
.switch {
  appearance: none; border: 0; width: 38px; height: 22px; border-radius: 20px; background: var(--ring-track);
  position: relative; cursor: pointer; transition: background .22s ease; flex: 0 0 auto; padding: 0;
}
.switch::after { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.2); transition: transform .22s ease; }
.switch.on { background: var(--accent); }
.switch.on::after { transform: translateX(16px); }
.selected-list { display: flex; flex-direction: column; gap: 8px; }
.selected-item { display: flex; align-items: flex-start; gap: 10px; padding: 12px 12px; border-radius: 15px; border: 1px solid var(--border); background: var(--surface); }
.selected-number { flex: 0 0 auto; width: 24px; height: 24px; border-radius: 8px; display: grid; place-items: center; color: var(--accent); background: var(--surface-2); font-size: 9px; font-weight: 750; }
.selected-content { min-width: 0; flex: 1; }
.selected-title { font-size: 10px; line-height: 1.55; font-weight: 600; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.selected-meta { font-size: 8px; color: var(--muted); margin-top: 5px; }
.remove-selected { flex: 0 0 auto; width: 26px; height: 26px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); display: grid; place-items: center; cursor: pointer; }
.remove-selected:hover { color: var(--danger); background: var(--danger-soft); }
.paper-generate { margin-top: 16px; }
.paper-note { margin-top: 10px; text-align: center; font-size: 8px; color: var(--muted); line-height: 1.6; }

/* ============ 我的 ============ */
.profile-hero {
  position: relative; overflow: hidden; margin-top: 5px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); padding: 18px; box-shadow: var(--shadow);
}
.profile-hero::after { content: ""; position: absolute; width: 145px; height: 145px; border-radius: 50%; right: -70px; top: -70px; border: 1px solid rgba(var(--accent-rgb), .12); box-shadow: 0 0 0 18px rgba(var(--accent-rgb), .035); }
.profile-row { display: flex; align-items: center; gap: 12px; }
.profile-avatar { width: 48px; height: 48px; border-radius: 18px; display: grid; place-items: center; color: var(--accent); background: var(--surface-2); border: 1px solid var(--border); }
.profile-name { font-size: 16px; font-weight: 730; }
.profile-sub { margin-top: 5px; color: var(--muted); font-size: 9px; }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px; }
.stat-cell { padding: 12px; border-radius: 14px; background: var(--surface-2); }
.stat-cell strong { display: block; font-size: 23px; line-height: 1.1; letter-spacing: -.8px; }
.stat-cell span { display: block; color: var(--muted); font-size: 8px; margin-top: 5px; }
.profile-stat-note { margin-top: 10px; color: var(--muted); font-size: 8px; }
.setting-group { margin-top: 20px; }
.setting-title { display: flex; align-items: center; justify-content: space-between; margin: 0 3px 8px; font-size: 9px; color: var(--muted); font-weight: 650; letter-spacing: .4px; }
.setting-card { border: 1px solid var(--border); border-radius: 18px; background: var(--surface); overflow: hidden; }
.setting-row {
  width: 100%; border: 0; border-top: 1px solid var(--border); background: transparent; color: var(--text);
  padding: 13px 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  text-align: left; cursor: pointer; min-height: 47px;
}
.setting-row:first-child { border-top: 0; }
.setting-row:active { background: var(--surface-2); }
.setting-row-main { display: flex; align-items: center; gap: 10px; min-width: 0; }
.setting-icon { width: 29px; height: 29px; border-radius: 9px; display: grid; place-items: center; color: var(--accent); background: var(--surface-2); flex: 0 0 auto; }
.setting-name { display: block; font-size: 10px; font-weight: 600; }
.setting-desc { display: block; font-size: 8px; color: var(--muted); margin-top: 3px; }
.setting-value { color: var(--muted); font-size: 9px; display: flex; align-items: center; gap: 4px; flex: 0 0 auto; }
.theme-pick-list { display: flex; flex-direction: column; gap: 7px; padding: 8px; }
.theme-pick {
  appearance: none; border: 1px solid transparent; background: transparent; color: var(--text); width: 100%;
  min-height: 47px; border-radius: 13px; padding: 7px 9px; display: flex; align-items: center; gap: 10px;
  text-align: left; cursor: pointer; transition: background .2s ease, border-color .2s ease;
}
.theme-pick:hover { background: var(--surface-2); }
.theme-pick.active { background: var(--surface-2); border-color: rgba(var(--accent-rgb), .28); }
.theme-pick-swatch { width: 28px; height: 28px; border-radius: 9px; border: 1px solid rgba(0,0,0,.08); flex: 0 0 auto; }
.theme-pick-text { flex: 1; min-width: 0; }
.theme-pick-name { display: block; font-size: 10px; font-weight: 650; }
.theme-pick-desc { display: block; font-size: 8px; color: var(--muted); margin-top: 3px; }
.theme-pick-check { width: 19px; height: 19px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; opacity: 0; transform: scale(.7); transition: opacity .2s ease, transform .2s ease; }
.theme-pick.active .theme-pick-check { opacity: 1; transform: scale(1); }
.about-card { margin-top: 18px; padding: 13px 14px; border-radius: 16px; border: 1px dashed var(--border-strong); color: var(--muted); font-size: 8px; line-height: 1.7; }
.about-card strong { color: var(--text); font-weight: 650; }

/* ============ 底部面板 / 弹层 ============ */
.modal-layer { position: absolute; inset: 0; z-index: 60; }
.modal-scrim { position: absolute; inset: 0; background: rgba(5, 10, 12, .48); backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px); animation: fade-in .25s ease both; }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
.bottom-sheet {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; max-height: 91%;
  background: var(--sheet); border: 1px solid var(--border); border-bottom: 0;
  border-radius: 28px 28px 0 0; box-shadow: 0 -22px 55px rgba(5, 12, 12, .23);
  padding: 9px 18px calc(22px + env(safe-area-inset-bottom, 0px)); overflow: auto;
  animation: sheet-up .48s cubic-bezier(.22,1,.36,1) both;
}
@keyframes sheet-up { from { transform: translateY(105%); } to { transform: translateY(0); } }
.sheet-grab { width: 35px; height: 4px; border-radius: 5px; background: var(--text); opacity: .16; margin: 0 auto 12px; }
.sheet-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.sheet-kicker { font-size: 7px; letter-spacing: 1.8px; color: var(--accent); font-weight: 750; margin-bottom: 4px; }
.sheet-heading h2 { font-family: var(--font-title); font-size: 20px; line-height: 1.2; letter-spacing: -.35px; font-weight: 760; }
.sheet-heading p { margin-top: 5px; color: var(--muted); font-size: 9px; line-height: 1.5; }
.sheet-close {
  appearance: none; border: 0; background: var(--surface-2); color: var(--muted); width: 29px; height: 29px;
  flex: 0 0 auto; border-radius: 50%; display: grid; place-items: center; cursor: pointer;
}
.sheet-close:active { transform: scale(.9); }
.theme-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 16px; }
.theme-option {
  --mini-bg: #f4f2ec; --mini-card: #fffefa; --mini-accent: #17775a; --mini-ink: #17241f; --mini-line: #dce8e0;
  appearance: none; position: relative; min-width: 0; display: flex; flex-direction: column; text-align: left;
  color: var(--text); border: 1px solid var(--border); border-radius: 18px; padding: 8px;
  background: rgba(var(--accent-rgb), .025); cursor: pointer;
  transition: transform .22s cubic-bezier(.22,1,.36,1), border-color .25s ease, box-shadow .25s ease;
}
.theme-option:hover { transform: translateY(-2px); border-color: rgba(var(--accent-rgb), .3); }
.theme-option:active { transform: scale(.975); }
.theme-option.selected { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(var(--accent-rgb), .13), var(--shadow); }
.theme-option[data-theme="tech"] { --mini-bg: #f3f6fc; --mini-card: #fff; --mini-accent: #315efb; --mini-ink: #101828; --mini-line: #e2e8f3; }
.theme-option[data-theme="glass"] { --mini-bg: #080b14; --mini-card: rgba(255,255,255,.08); --mini-accent: #8b5cf6; --mini-ink: #f4f5fb; --mini-line: rgba(255,255,255,.15); }
.theme-option[data-theme="playful"] { --mini-bg: #fff8ee; --mini-card: #fff4d9; --mini-accent: #ef7566; --mini-ink: #403a4d; --mini-line: #f3dfce; }
.mini-preview { position: relative; height: 78px; border-radius: 12px; overflow: hidden; padding: 8px 9px; background: var(--mini-bg); color: var(--mini-ink); border: 1px solid var(--mini-line); }
.mini-head { display: flex; align-items: center; justify-content: space-between; }
.mini-brand { display: flex; align-items: center; gap: 4px; }
.mini-logo { width: 12px; height: 12px; border-radius: 4px; background: var(--mini-accent); opacity: .92; }
.mini-word { width: 21px; height: 3px; border-radius: 3px; background: var(--mini-ink); opacity: .72; }
.mini-dot { width: 8px; height: 8px; border-radius: 50%; border: 1px solid var(--mini-line); }
.mini-cards { display: grid; grid-template-columns: 1.1fr .9fr; gap: 5px; margin-top: 8px; }
.mini-card { height: 25px; border-radius: 7px; background: var(--mini-card); border: 1px solid var(--mini-line); }
.mini-card.accent { background: var(--mini-accent); border-color: transparent; position: relative; }
.mini-card.accent::after { content: ""; position: absolute; left: 5px; bottom: 5px; width: 17px; height: 3px; border-radius: 2px; background: rgba(255,255,255,.72); }
.mini-lines { display: flex; align-items: flex-end; gap: 4px; margin-top: 7px; }
.mini-line { display: block; height: 4px; border-radius: 3px; background: var(--mini-ink); opacity: .13; }
.mini-line.long { width: 41px; }
.mini-line.short { width: 23px; opacity: .09; }
.mini-ring { width: 17px; height: 17px; margin-left: auto; border-radius: 50%; border: 3px solid var(--mini-accent); border-right-color: var(--mini-line); opacity: .86; }
.theme-option-name { margin-top: 8px; font-size: 11px; line-height: 1.2; font-weight: 720; }
.theme-option-desc { margin-top: 4px; font-size: 8px; line-height: 1.25; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.theme-check {
  position: absolute; top: 13px; right: 13px; width: 18px; height: 18px; border-radius: 50%;
  display: grid; place-items: center; color: #fff; background: var(--accent);
  opacity: 0; transform: scale(.55); transition: opacity .2s ease, transform .25s cubic-bezier(.22,1,.36,1);
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
.theme-option.selected .theme-check { opacity: 1; transform: scale(1); }
.sheet-foot { margin-top: 14px; padding-top: 11px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 8px; }
.sheet-foot svg { color: var(--accent); }

/* 题目详情 */
.question-sheet { max-height: 89%; }
.detail-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 13px; }
.detail-chapter { display: flex; gap: 5px; flex-wrap: wrap; }
.detail-source { font-size: 8px; color: var(--muted); margin-top: 10px; }
.detail-title { margin-top: 13px; font-size: 16px; line-height: 1.7; font-weight: 600; }
.detail-info { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 12px; }
.detail-answer { margin-top: 15px; padding: 14px; border-radius: 15px; background: var(--surface-2); animation: view-rise .3s both; }
.detail-answer .answer-text { margin-top: 7px; }
.detail-answer .explanation { color: var(--text-soft); }
.detail-actions { display: flex; gap: 8px; margin-top: 16px; }
.detail-actions .btn { flex: 1; }
.detail-scan-placeholder { margin-top: 14px; height: 88px; border-radius: 13px; border: 1px dashed var(--border-strong); display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 8px; gap: 7px; background: var(--surface-2); }

/* 试卷预览 */
.paper-preview-sheet { height: 92%; display: flex; flex-direction: column; padding-bottom: 0; }
.preview-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-bottom: 11px; border-bottom: 1px solid var(--border); flex: 0 0 auto; }
.preview-head-actions { display: flex; gap: 6px; }
.paper-scroll { flex: 1; overflow: auto; margin: 12px -10px 0; padding: 0 10px 20px; }
.paper-doc { background: #fff; color: #171717; border-radius: 10px; padding: 22px 19px; font-family: "PingFang SC", "Microsoft YaHei", sans-serif; box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.paper-doc-cover { text-align: center; border-bottom: 1.5px solid #1e1e1e; padding-bottom: 15px; margin-bottom: 18px; }
.paper-doc-cover h2 { font-family: "Songti SC", "STSong", serif; font-size: 20px; letter-spacing: 1px; }
.paper-doc-meta { margin-top: 9px; color: #696969; font-size: 8px; display: flex; justify-content: center; gap: 12px; }
.paper-doc-sub { margin-top: 12px; color: #3d3d3d; font-size: 8px; line-height: 1.7; }
.paper-q-block { margin-top: 17px; font-size: 10px; line-height: 1.8; }
.paper-q-number { font-weight: 700; margin-bottom: 5px; }
.paper-q-text { text-align: justify; }
.paper-answer-space { height: 34px; border-bottom: 1px solid #ececec; margin-top: 7px; }
.paper-answer-sheet { border-top: 1.5px solid #1e1e1e; margin-top: 24px; padding-top: 14px; }
.paper-answer-sheet h3 { font-family: "Songti SC", "STSong", serif; font-size: 13px; text-align: center; margin-bottom: 13px; }
.paper-answer-item { font-size: 8.5px; line-height: 1.75; color: #333; margin-top: 10px; }
.paper-answer-item strong { color: #111; }

.delete-sheet { padding-top: 22px; text-align: center; }
.delete-icon {
  width: 58px; height: 58px; margin: 3px auto 14px; border-radius: 19px;
  display: grid; place-items: center; color: var(--danger); background: var(--danger-soft);
}
.delete-title { font-family: var(--font-title); font-size: 21px; font-weight: 750; letter-spacing: -.3px; }
.delete-question {
  margin-top: 12px; padding: 11px 12px; border-radius: 12px; background: var(--surface-2);
  color: var(--text-soft); font-size: 10px; line-height: 1.65; text-align: left;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.delete-warning { margin-top: 11px; color: var(--muted); font-size: 8px; line-height: 1.65; text-align: left; }
.delete-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px; }
.delete-actions .btn { min-height: 44px; }
.delete-link {
  appearance: none; border: 0; background: transparent; color: var(--muted); font-size: 9px;
  display: block; margin: 16px auto 0; padding: 6px; cursor: pointer; text-decoration: underline;
}
.delete-link:hover { color: var(--danger); }

/* OCR 设置 */
.ocr-form { margin-top: 18px; gap: 10px; }
.ocr-form .lock-field label { font-size: 9px; }
.ocr-actions { display: grid; grid-template-columns: 1fr 1.25fr; gap: 8px; margin-top: 2px; }
.ocr-actions .btn { min-height: 42px; border-radius: 12px; }
.ocr-test-status { min-height: 16px; margin-top: 2px; color: var(--muted); font-size: 8px; line-height: 1.55; }
.ocr-test-status.pending { color: var(--warning); }
.ocr-test-status.success { color: var(--success); }
.ocr-test-status.error { color: var(--danger); }
.ocr-privacy {
  display: flex; align-items: flex-start; gap: 7px; margin-top: 14px; padding: 11px 12px;
  border-radius: 13px; background: var(--surface-2); color: var(--muted); font-size: 8px; line-height: 1.65;
}
.ocr-privacy svg { flex: 0 0 auto; margin-top: 1px; color: var(--accent); }
.select-input { appearance: none; -webkit-appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 18px) 21px, calc(100% - 13px) 21px; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 35px; }
.ocr-settings-sheet { max-height: 94%; }
.ocr-settings-sheet .lock-form { margin-top: 15px; }
.ocr-settings-sheet .lock-input { height: 44px; font-size: 12px; }
.ocr-settings-sheet .lock-input.pin { font-size: 12px; letter-spacing: normal; }
.ocr-settings-sheet .lock-field label { font-size: 8px; }

/* 试卷导出与分享 */
.preview-actions {
  flex: 0 0 auto; display: flex; gap: 8px; padding: 10px 0 calc(14px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--border); background: var(--sheet);
}
.preview-actions .btn { flex: 1; }
.preview-close { flex: 0 0 auto; }
.pdf-stage {
  position: fixed; left: -12000px; top: 0; width: 794px; background: #fff; color: #171717;
  z-index: -1; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.pdf-page {
  position: relative; width: 794px; height: 1123px; padding: 56px 54px 38px;
  background: #fff; color: #171717; box-sizing: border-box;
}
.pdf-page-inner { height: 1029px; overflow: hidden; }
.pdf-page-number { position: absolute; left: 0; right: 0; bottom: 20px; text-align: center; color: #8a8a8a; font-size: 10px; }
.pdf-cover { text-align: center; border-bottom: 1.5px solid #1e1e1e; padding-bottom: 17px; margin-bottom: 18px; }
.pdf-cover h1 { margin: 0; font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif; font-size: 25px; letter-spacing: 2px; font-weight: 700; }
.pdf-cover-meta { display: flex; justify-content: center; gap: 18px; margin-top: 11px; color: #666; font-size: 11px; }
.pdf-cover-note { margin-top: 12px; color: #444; font-size: 11px; line-height: 1.7; }
.pdf-question { margin-top: 19px; font-size: 14px; line-height: 1.85; page-break-inside: avoid; }
.pdf-question-title { text-align: justify; }
.pdf-answer-space { height: 62px; border-bottom: 1px solid #e8e8e8; }
.pdf-answer-sheet { border-top: 1.5px solid #1e1e1e; padding-top: 12px; }
.pdf-answer-title { text-align: center; font-family: "Songti SC", "STSong", serif; font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.pdf-answer-block { padding: 10px 0; border-bottom: 1px solid #efefef; font-size: 12px; line-height: 1.85; page-break-inside: avoid; }
.pdf-answer-block strong { font-weight: 700; }
.pdf-answer-exp { margin-top: 3px; color: #444; }

/* 提示 */
.toast {
  position: absolute; z-index: 90; top: 52px; left: 50%; max-width: 300px; padding: 9px 13px;
  border-radius: 13px; background: var(--text); color: var(--bg); box-shadow: 0 10px 28px rgba(5,12,10,.2);
  font-size: 10px; font-weight: 620; display: flex; align-items: center; gap: 7px; white-space: nowrap;
  opacity: 0; transform: translate(-50%, -8px) scale(.96); pointer-events: none;
  transition: opacity .25s ease, transform .3s cubic-bezier(.22,1,.36,1);
}
.toast.show { opacity: 1; transform: translate(-50%, 0) scale(1); }
.phone.theme-changing .hero-card,
.app.theme-changing .review-card,
.app.theme-changing .metric-card,
.app.theme-changing .bottom-nav,
.app.theme-changing .theme-trigger { transition: background .38s ease, color .38s ease, border-color .38s ease, box-shadow .38s ease; }
.app.theme-changing::after {
  content: ""; position: absolute; inset: 0; z-index: 45; pointer-events: none;
  background: radial-gradient(circle at 88% 8%, rgba(var(--accent-rgb), .22), transparent 42%);
  animation: theme-wash .62s ease both;
}
@keyframes theme-wash { 0% { opacity: 0; } 28% { opacity: 1; } 100% { opacity: 0; } }

/* ============ 主题：暖白纸感 ============ */
.app.paper { --sheet: #fffefa; }
.paper .ambient::before { inset: 0; opacity: .25; background-image: radial-gradient(rgba(35,67,52,.16) .45px, transparent .55px); background-size: 5px 5px; }
.paper .ambient::after { width: 240px; height: 240px; right: -145px; top: 90px; border-radius: 50%; border: 1px solid rgba(23,119,90,.1); box-shadow: 0 0 0 30px rgba(23,119,90,.025), 0 0 0 62px rgba(23,119,90,.02); }
.paper .hero-card.scan-card { background: linear-gradient(145deg, #1c7d60, #105f49); }
.paper .hero-card.scan-card::after { content: ""; position: absolute; width: 115px; height: 115px; border: 1px solid rgba(255,255,255,.1); border-radius: 50%; right: -55px; top: -48px; box-shadow: 0 0 0 20px rgba(255,255,255,.025); }
.paper .brand-mark { border-radius: 11px 11px 11px 3px; }

/* ============ 主题：冷白科技 ============ */
.app.tech {
  --bg: #f3f6fc; --surface: #fff; --surface-2: #edf2ff; --surface-3: #e4ebfd;
  --text: #101828; --text-soft: #344054; --muted: #697586;
  --accent: #315efb; --accent-rgb: 49,94,251; --accent-2: #dfe8ff;
  --border: #e2e8f3; --border-strong: #cbd6e8;
  --shadow: 0 12px 28px rgba(41,72,135,.075); --shadow-lift: 0 20px 45px rgba(41,72,135,.16);
  --nav: rgba(255,255,255,.9); --sheet: #fff; --ring-track: #e9edf5;
  --danger: #d13b55; --danger-soft: #fdecef; --success: #0b8f63; --success-soft: #e4f6ef; --warning: #b87712; --warning-soft: #fff5db;
  --radius: 20px; --font-title: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
.tech .ambient::before { inset: 0; background-image: linear-gradient(rgba(49,94,251,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(49,94,251,.025) 1px, transparent 1px); background-size: 28px 28px; mask-image: linear-gradient(to bottom, #000, transparent 48%); }
.tech .ambient::after { width: 230px; height: 230px; top: -140px; right: -70px; border-radius: 50%; background: #dce7ff; filter: blur(45px); opacity: .65; }
.tech .hero-card, .tech .review-card { border-radius: 20px; }
.tech .hero-card.scan-card { background: linear-gradient(140deg, #3868ff, #2447db); box-shadow: 0 14px 30px rgba(49,94,251,.22); }
.tech .hero-card.scan-card::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px); background-size: 18px 18px; mask-image: linear-gradient(135deg,#000,transparent 80%); }
.tech .review-card { border-left: 3px solid var(--accent); }
.tech .topic { border-radius: 14px; }
.tech .bottom-nav { border-radius: 19px; }
.tech .brand-mark { border-radius: 12px; }
.tech .page-title { letter-spacing: -1.2px; }

/* ============ 主题：深空玻璃 ============ */
.app.glass {
  --bg: #080b14; --surface: rgba(255,255,255,.075); --surface-2: rgba(255,255,255,.08); --surface-3: rgba(255,255,255,.12);
  --text: #f4f5fb; --text-soft: #c4c7d6; --muted: #959cb2;
  --accent: #a78bfa; --accent-rgb: 167,139,250; --accent-2: #22d3ee;
  --border: rgba(255,255,255,.115); --border-strong: rgba(255,255,255,.22);
  --shadow: 0 16px 40px rgba(0,0,0,.24); --shadow-lift: 0 24px 55px rgba(0,0,0,.42);
  --nav: rgba(19,22,36,.82); --sheet: #141522; --ring-track: rgba(255,255,255,.09);
  --danger: #ff8e9e; --danger-soft: rgba(255,91,117,.14); --success: #5ee1b7; --success-soft: rgba(94,225,183,.12); --warning: #f7c76a; --warning-soft: rgba(247,199,106,.12);
  --radius: 22px; --font-title: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
.glass .ambient::before { width: 330px; height: 330px; left: -170px; top: 30px; background: #6d28d9; border-radius: 50%; filter: blur(90px); opacity: .26; }
.glass .ambient::after { width: 310px; height: 310px; right: -175px; top: 330px; background: #0891b2; border-radius: 50%; filter: blur(95px); opacity: .18; }
.glass .brand-mark, .glass .avatar, .glass .icon-button, .glass .theme-trigger,
.glass .hero-card, .glass .review-card, .glass .q-card, .glass .metric-card,
.glass .bottom-nav, .glass .setting-card, .glass .profile-hero { backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); }
.glass .brand-mark { background: linear-gradient(145deg, rgba(167,139,250,.18), rgba(34,211,238,.07)); }
.glass .hero-card.scan-card { background: linear-gradient(140deg, rgba(139,92,246,.92), rgba(67,56,202,.88)); box-shadow: 0 12px 36px rgba(124,58,237,.27), inset 0 1px 0 rgba(255,255,255,.24); }
.glass .hero-card.scan-card::after { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 15% 0, rgba(255,255,255,.22), transparent 42%); }
.glass .hero-card.scan-card .hero-title { color: #fff; }
.glass .review-card { background: linear-gradient(135deg, rgba(255,255,255,.09), rgba(255,255,255,.045)); }
.glass .progress-ring { background: conic-gradient(#a78bfa 0 27%, #22d3ee 27% 40%, var(--ring-track) 40%); }
.glass .ring-inner { background: #17152a; }
.glass .pill { color: #c9b8ff; background: rgba(167,139,250,.12); }
.glass .q-add { background: rgba(255,255,255,.08); }
.glass .bottom-nav { box-shadow: 0 16px 44px rgba(0,0,0,.4), inset 0 1px 0 rgba(255,255,255,.06); }
.glass .paper-doc { color-scheme: light; }

/* ============ 主题：低饱和多彩 ============ */
.app.playful {
  --bg: #fff8ee; --surface: #fffefd; --surface-2: #f1edff; --surface-3: #e9e3ff;
  --text: #403a4d; --text-soft: #665c70; --muted: #8d8494;
  --accent: #ef7566; --accent-rgb: 239,117,102; --accent-2: #9b8afb;
  --border: rgba(85,65,95,.075); --border-strong: rgba(85,65,95,.16);
  --shadow: 0 10px 24px rgba(105,82,80,.065); --shadow-lift: 0 20px 40px rgba(105,82,80,.14);
  --nav: rgba(255,254,253,.92); --sheet: #fffefd; --ring-track: #f3e9df;
  --danger: #d45d56; --danger-soft: #ffe8e1; --success: #4f9d7e; --success-soft: #e4f5ea; --warning: #b47a25; --warning-soft: #fff2d6;
  --radius: 28px; --font-title: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
.playful .ambient::before { width: 74px; height: 74px; right: 17px; top: 86px; border: 2px dashed rgba(155,138,251,.18); border-radius: 50%; }
.playful .ambient::after { content: "✦"; color: rgba(239,117,102,.25); font-size: 30px; left: 12px; top: 260px; transform: rotate(15deg); }
.playful .brand-mark { border-radius: 13px 9px 13px 9px; color: #8b78e8; background: #f0ebff; transform: rotate(-3deg); }
.playful .page-kicker { color: #9b8afb; }
.playful .hero-card.scan-card { background: linear-gradient(145deg, #ff9381, #ed7467); box-shadow: 0 13px 28px rgba(239,117,102,.18); }
.playful .hero-card.library-card { background: #f1edff; }
.playful .hero-card.library-card .hero-icon { color: #8d78e8; background: rgba(255,255,255,.7); }
.playful .hero-card.library-card .hero-arrow { color: #8d78e8; background: rgba(255,255,255,.62); }
.playful .review-card { background: #fff4d9; border-color: rgba(185,142,45,.08); }
.playful .review-card .pill { color: #a77828; background: rgba(255,255,255,.65); }
.playful .review-card .review-cta { color: #b07925; }
.playful .review-card .progress-ring { background: conic-gradient(#e8ad45 0 40%, rgba(255,255,255,.7) 40%); }
.playful .review-card .ring-inner { background: #fff4d9; }
.playful .topic:nth-child(1) { background: #eaf7ef; }
.playful .topic:nth-child(2) { background: #f0edff; }
.playful .bottom-nav { border-radius: 24px; }
.playful .page-title { letter-spacing: -.8px; }
.playful .btn.primary { color: #fff; }

/* ============ 本机登录 ============ */
.lock-screen {
  position: absolute; inset: 0; z-index: 120; overflow-y: auto;
  padding: 30px 24px calc(24px + env(safe-area-inset-bottom, 0px));
  background: var(--bg); color: var(--text); display: flex; flex-direction: column;
}
.lock-screen[hidden] { display: none !important; }
.lock-screen::before {
  content: ""; position: absolute; width: 280px; height: 280px; border-radius: 50%;
  right: -155px; top: 70px; border: 1px solid rgba(var(--accent-rgb), .12);
  box-shadow: 0 0 0 30px rgba(var(--accent-rgb), .025), 0 0 0 65px rgba(var(--accent-rgb), .018);
  pointer-events: none;
}
.lock-top { display: flex; align-items: center; justify-content: space-between; position: relative; z-index: 1; }
.lock-brand { display: flex; align-items: center; gap: 10px; }
.lock-brand .brand-mark { box-shadow: var(--shadow); }
.lock-badge {
  display: inline-flex; align-items: center; gap: 4px; padding: 5px 8px; border-radius: 20px;
  background: var(--surface-2); color: var(--accent); font-size: 7px; font-weight: 750; letter-spacing: .7px;
}
.lock-hero { margin-top: 48px; position: relative; z-index: 1; }
.lock-icon {
  width: 58px; height: 58px; border-radius: 19px; display: grid; place-items: center; margin-bottom: 23px;
  color: var(--accent); background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
}
.lock-title { font-family: var(--font-title); font-size: 29px; line-height: 1.25; letter-spacing: -.7px; font-weight: 760; }
.lock-sub { color: var(--muted); font-size: 10px; line-height: 1.75; margin-top: 10px; max-width: 290px; }
.lock-form { margin-top: 27px; display: flex; flex-direction: column; gap: 13px; position: relative; z-index: 1; }
.lock-field label { display: block; margin: 0 0 7px 2px; color: var(--muted); font-size: 8px; font-weight: 650; letter-spacing: .3px; }
.lock-input {
  width: 100%; height: 48px; border-radius: 14px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); padding: 0 14px; font-size: 14px; outline: none;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.lock-input::placeholder { color: var(--muted); font-size: 11px; }
.lock-input:focus { border-color: rgba(var(--accent-rgb), .48); box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .1); }
.lock-input.pin { letter-spacing: 7px; font-size: 20px; font-weight: 700; }
.lock-error { color: var(--danger); font-size: 9px; line-height: 1.55; min-height: 14px; padding-left: 2px; }
.lock-submit { min-height: 48px; margin-top: 2px; }
.lock-switch { text-align: center; color: var(--muted); font-size: 9px; margin-top: 14px; position: relative; z-index: 1; }
.lock-switch button, .lock-reset { appearance: none; border: 0; background: transparent; color: var(--accent); font-size: inherit; font-weight: 650; cursor: pointer; padding: 4px; }
.lock-note {
  display: flex; align-items: flex-start; gap: 7px; margin-top: 16px;
  color: var(--muted); font-size: 8px; line-height: 1.65; position: relative; z-index: 1;
}
.lock-note svg { flex: 0 0 auto; margin-top: 1px; color: var(--accent); }
.lock-reset { margin: auto auto 0; padding-top: 30px; color: var(--muted); text-decoration: underline; font-weight: 500; }
.lock-account {
  display: flex; align-items: center; gap: 10px; margin-top: 25px; padding: 12px 13px;
  border: 1px solid var(--border); border-radius: 15px; background: var(--surface);
}
.lock-account-avatar { width: 32px; height: 32px; border-radius: 11px; display: grid; place-items: center; color: var(--accent); background: var(--surface-2); }
.lock-account-name { font-size: 11px; font-weight: 700; }
.lock-account-sub { color: var(--muted); font-size: 8px; margin-top: 3px; }

/* Android WebView：系统自带状态栏，隐藏网页里的模拟状态栏 */
.app.native-app .statusbar, .app.native-app .gesture { display: none; }
.app.native-app .app-scroll { padding-top: 13px; }

/* ============ 响应式 ============ */
@media (max-width: 430px) {
  body { display: block; background: var(--bg, #f4f2ec); overflow: hidden; }
  .app { width: 100vw; height: 100vh; height: 100dvh; border-radius: 0; box-shadow: none; flex-basis: auto; }
}
@media (max-height: 760px) and (min-width: 431px) {
  .app { height: 94vh; width: calc(94vh * .462); flex-basis: calc(94vh * .462); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}


/* Android WebView 原生打印：只输出试卷内容 */
@media print {
  @page { size: A4; margin: 16mm; }
  html, body { background: #fff !important; height: auto !important; overflow: visible !important; display: block !important; }
  .app { position: static !important; display: block !important; width: auto !important; height: auto !important; overflow: visible !important; border-radius: 0 !important; box-shadow: none !important; background: #fff !important; }
  .ambient, .statusbar, .bottom-nav, .gesture, .appbar, .preview-head, .preview-actions, .sheet-grab,
  .toast, .lock-screen, .paper-dock, .page-heading, .flow-note { display: none !important; }
  .app-scroll, .paper-scroll { overflow: visible !important; height: auto !important; max-height: none !important; padding: 0 !important; margin: 0 !important; }
  .modal-layer, .bottom-sheet, .paper-preview-sheet { position: static !important; display: block !important; height: auto !important; max-height: none !important; padding: 0 !important; margin: 0 !important; border: 0 !important; box-shadow: none !important; background: #fff !important; }
  .modal-scrim { display: none !important; }
  .paper-doc { box-shadow: none !important; border-radius: 0 !important; padding: 0 !important; }
  .paper-answer-sheet { page-break-before: always; }
}