/* ================= 基础与变量 ================= */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
:root {
  --primary: #4f6ef7;
  --primary-dark: #3b55d9;
  --primary-soft: #eef1fe;
  --danger: #f05a5a;
  --success: #2ebd8c;
  --warning: #f5a623;
  --text: #232733;
  --text-2: #6b7280;
  --text-3: #9ca3af;
  --bg: #f4f6fb;
  --card: #ffffff;
  --border: #eceef4;
  --radius: 14px;
  --shadow: 0 2px 12px rgba(31, 45, 92, .07);
  --shadow-lg: 0 10px 40px rgba(31, 45, 92, .18);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.55;
  overflow: hidden;
}
button, input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
button { border: none; background: none; cursor: pointer; }
.hidden { display: none !important; }

/* ================= 布局 ================= */
.app {
  max-width: 900px;
  margin: 0 auto;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  position: relative;
  box-shadow: 0 0 40px rgba(0,0,0,.05);
}
.topbar {
  flex: none;
  height: 52px;
  padding: 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar-title { font-size: 17px; font-weight: 700; }
.topbar-right { display: flex; align-items: center; gap: 6px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 50%;
  font-size: 18px; display: grid; place-items: center;
}
.icon-btn:active { background: var(--bg); }
.net-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--success); margin-right: 4px;
  box-shadow: 0 0 0 3px rgba(46,189,140,.18);
}
.net-dot.offline { background: var(--text-3); box-shadow: 0 0 0 3px rgba(156,163,175,.2); }

.content { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding-bottom: 84px; }
.view { padding: 14px 14px 20px; animation: fadeIn .22s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ================= 底部导航 ================= */
.tabbar {
  flex: none;
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: calc(62px + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--card);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 30;
}
.tab {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px;
  color: var(--text-3);
  font-size: 11px;
}
.tab span { font-size: 20px; line-height: 1; }
.tab em { font-style: normal; }
.tab.active { color: var(--primary); font-weight: 600; }
.tab-capture { position: relative; flex: 0 0 64px; }
.tab-plus {
  width: 46px; height: 46px; margin-top: -22px;
  background: linear-gradient(135deg, #5b78ff, #4f6ef7);
  color: #fff !important;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 26px !important; font-weight: 300;
  box-shadow: 0 6px 16px rgba(79,110,247,.42);
}

/* ================= 通用组件 ================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px;
  border-radius: 10px;
  font-size: 14px; font-weight: 600;
  transition: transform .08s, opacity .15s;
}
.btn:active { transform: scale(.96); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-outline { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-ghost { background: var(--bg); color: var(--text-2); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-lg { padding: 12px 26px; font-size: 15px; border-radius: 12px; }
.btn-block { width: 100%; }
.link-btn { color: var(--primary); font-size: 13px; font-weight: 500; padding: 4px; }
.center-link { display: block; text-align: center; margin-top: 14px; }

.block-title {
  display: flex; align-items: center; justify-content: space-between;
  margin: 20px 2px 10px;
  font-size: 15px; font-weight: 700;
}

.card-list { display: flex; flex-direction: column; gap: 10px; }

/* ================= 首页 ================= */
.hero-card {
  background: linear-gradient(135deg, #5b78ff 0%, #6f5cf2 100%);
  border-radius: 18px;
  padding: 18px;
  color: #fff;
  display: flex; align-items: center; justify-content: space-between;
  box-shadow: 0 8px 24px rgba(91,120,255,.32);
}
.hero-date { font-size: 12.5px; opacity: .88; }
.hero-greeting { font-size: 19px; font-weight: 700; margin: 2px 0; }
.hero-sub { font-size: 12.5px; opacity: .85; }
.hero-emoji { font-size: 44px; }

.stat-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 8px; margin-top: 12px;
}
.stat-card {
  background: var(--card); border-radius: 12px;
  padding: 12px 6px; text-align: center;
  box-shadow: var(--shadow);
}
.stat-num { font-size: 20px; font-weight: 800; line-height: 1.2; }
.stat-label { font-size: 11.5px; color: var(--text-2); margin-top: 2px; }
.stat-blue .stat-num { color: var(--primary); }
.stat-green .stat-num { color: var(--success); }
.stat-orange .stat-num { color: var(--warning); }
.stat-purple .stat-num { color: #8b5cf6; }

.review-action-card {
  margin-top: 14px;
  background: var(--card); border-radius: var(--radius);
  padding: 16px;
  display: flex; align-items: center; gap: 12px;
  box-shadow: var(--shadow);
}
.review-action-text { flex: 1; }
.review-action-text h3 { font-size: 15px; }
.review-action-text p { font-size: 12.5px; color: var(--text-2); margin-top: 3px; }

.subject-rows { display: flex; flex-direction: column; gap: 8px; }
.subject-row {
  background: var(--card); border-radius: 12px; padding: 12px 14px;
  display: flex; align-items: center; gap: 12px;
  box-shadow: var(--shadow);
}
.subject-row .s-icon {
  width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center; font-size: 19px;
  background: var(--primary-soft);
}
.subject-row .s-main { flex: 1; min-width: 0; }
.subject-row .s-name { font-weight: 600; font-size: 14px; }
.subject-row .s-bar { height: 5px; background: var(--bg); border-radius: 3px; margin-top: 6px; overflow: hidden; }
.subject-row .s-bar i { display: block; height: 100%; background: var(--primary); border-radius: 3px; }
.subject-row .s-num { font-size: 12px; color: var(--text-2); white-space: nowrap; }

/* ================= 错题列表 ================= */
.search-bar {
  display: flex; align-items: center; gap: 8px;
  background: var(--card); border-radius: 12px;
  padding: 9px 14px; box-shadow: var(--shadow);
}
.search-bar input { flex: 1; border: none; outline: none; background: none; }
.search-icon { color: var(--text-3); }

.subject-chips { display: flex; gap: 8px; overflow-x: auto; padding: 12px 2px 4px; scrollbar-width: none; }
.subject-chips::-webkit-scrollbar { display: none; }
.chip {
  flex: none; padding: 6px 14px; border-radius: 16px;
  background: var(--card); color: var(--text-2);
  font-size: 13px; box-shadow: var(--shadow);
  display: inline-flex; align-items: center; gap: 4px;
}
.chip.active { background: var(--primary); color: #fff; }

.filter-row { display: flex; gap: 8px; margin-top: 10px; }
.mini-select {
  flex: 1; min-width: 0;
  padding: 7px 8px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--card);
  font-size: 12.5px; outline: none;
}
.list-meta { font-size: 12.5px; color: var(--text-2); margin: 12px 2px 8px; }

.mistake-card {
  background: var(--card); border-radius: var(--radius);
  padding: 13px 14px; box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
}
.mc-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.mc-subject {
  font-size: 11.5px; font-weight: 600; padding: 2px 9px;
  border-radius: 10px; color: #fff;
}
.mc-type { font-size: 11.5px; color: var(--text-2); }
.mc-date { font-size: 11.5px; color: var(--text-3); margin-left: auto; }
.mc-content {
  font-size: 14px; font-weight: 500;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; word-break: break-word;
}
.mc-content img { display: none; }
.mc-answers {
  margin-top: 6px; font-size: 12.5px; color: var(--text-2);
  display: flex; gap: 12px; flex-wrap: wrap;
}
.mc-answers .wrong { color: var(--danger); }
.mc-answers .right { color: var(--success); }
.mc-foot { display: flex; align-items: center; gap: 6px; margin-top: 9px; flex-wrap: wrap; }
.tag-pill {
  font-size: 11px; padding: 2px 9px; border-radius: 9px;
  background: #fff4ec; color: #e07b39;
}
.tag-pill.blue { background: var(--primary-soft); color: var(--primary); }
.tag-pill.gray { background: var(--bg); color: var(--text-2); }
.difficulty { font-size: 11px; color: var(--warning); letter-spacing: 1px; }
.mc-status { margin-left: auto; font-size: 11.5px; font-weight: 600; }
.mc-status.due { color: var(--warning); }
.mc-status.overdue { color: var(--danger); }
.mc-status.mastered { color: var(--success); }
.mc-actions { display: flex; gap: 8px; margin-top: 10px; }
.mc-actions .btn { flex: 1; padding: 7px 0; font-size: 12.5px; }

.empty-tip { text-align: center; padding: 60px 20px; color: var(--text-2); }
.empty-emoji { font-size: 52px; margin-bottom: 10px; }
.empty-tip p { margin-bottom: 16px; }

/* ================= 采集 ================= */
.capture-hero { text-align: center; padding: 40px 20px 28px; }
.capture-hero-emoji { font-size: 58px; }
.capture-hero h2 { margin: 10px 0 6px; }
.capture-hero p { color: var(--text-2); font-size: 13.5px; max-width: 280px; margin: 0 auto; }
.capture-btn {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; padding: 15px;
  border-radius: 14px; font-size: 15.5px; font-weight: 600;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}
.capture-btn:active { transform: scale(.98); }
.capture-btn span { font-size: 20px; }
.capture-btn-cam { background: var(--primary); color: #fff; }
.capture-btn-album { background: var(--card); color: var(--text); }
.capture-btn-manual { background: var(--card); color: var(--text); }
.capture-tip {
  margin-top: 24px; text-align: center; font-size: 12.5px; color: var(--text-3);
  background: var(--card); border-radius: 10px; padding: 10px;
}

.crop-wrap {
  position: relative; width: 100%;
  background: #1c2230; border-radius: 12px; overflow: hidden;
  margin-bottom: 12px;
  min-height: 260px;
  display: grid; place-items: center;
}
#cropCanvas { max-width: 100%; max-height: 60vh; display: block; }
.crop-box {
  position: absolute; border: 2px solid #fff;
  box-shadow: 0 0 0 9999px rgba(0,0,0,.35);
  border-radius: 4px;
}
.crop-handle {
  position: absolute; right: -10px; bottom: -10px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--primary);
  border: 3px solid #fff;
  cursor: nwse-resize;
}
.enhance-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.chip-btn {
  padding: 7px 14px; border-radius: 16px; font-size: 13px;
  background: var(--card); color: var(--text-2); box-shadow: var(--shadow);
}
.chip-btn.on { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.capture-actions { display: flex; gap: 10px; }
.capture-actions .btn { flex: 1; }
.progress-bar { height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; margin-top: 14px; }
.progress-inner { height: 100%; width: 0; background: var(--primary); border-radius: 4px; transition: width .25s; }
.progress-text { text-align: center; font-size: 12.5px; color: var(--text-2); margin-top: 7px; }

/* ================= 表单（详情/编辑弹层） ================= */
.modal-mask {
  position: absolute; inset: 0;
  background: rgba(20,25,40,.45);
  z-index: 50;
  display: flex; align-items: flex-end;
  animation: maskIn .2s;
}
@keyframes maskIn { from { opacity: 0; } to { opacity: 1; } }
.sheet {
  width: 100%; max-height: 92vh;
  background: var(--bg);
  border-radius: 18px 18px 0 0;
  display: flex; flex-direction: column;
  animation: sheetUp .25s cubic-bezier(.2,.8,.3,1);
}
@keyframes sheetUp { from { transform: translateY(40px); opacity: .6; } to { transform: none; opacity: 1; } }
.sheet-head {
  flex: none; display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px 8px;
}
.sheet-head h3 { font-size: 16px; }
.sheet-body { overflow-y: auto; padding: 4px 16px 20px; }

.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-2); margin-bottom: 6px; }
.form-label .req { color: var(--danger); }
.form-control {
  width: 100%; padding: 10px 12px;
  border: 1.5px solid var(--border); border-radius: 10px;
  background: var(--card); outline: none;
}
.form-control:focus { border-color: var(--primary); }
textarea.form-control { resize: vertical; min-height: 74px; }
.form-row { display: flex; gap: 10px; }
.form-row > * { flex: 1; }

.option-row { display: flex; gap: 8px; margin-bottom: 7px; align-items: center; }
.option-row .opt-key {
  width: 34px; height: 36px; flex: none;
  display: grid; place-items: center;
  background: var(--card); border: 1.5px solid var(--border); border-radius: 9px;
  font-size: 13px; font-weight: 600;
}
.option-row .opt-del { color: var(--danger); padding: 6px; font-size: 16px; }
.add-option-btn { font-size: 13px; color: var(--primary); padding: 6px 0; }

.check-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.check-tag {
  padding: 6px 13px; border-radius: 16px; font-size: 13px;
  background: var(--card); color: var(--text-2);
  border: 1.5px solid var(--border);
}
.check-tag.on { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); font-weight: 600; }

.diff-stars { display: flex; gap: 10px; font-size: 22px; color: #d8dce8; }
.diff-stars .star.on { color: var(--warning); }

.form-img { width: 100%; border-radius: 10px; margin-bottom: 8px; max-height: 240px; object-fit: contain; background: #1c2230; }
.form-actions { display: flex; gap: 10px; padding: 6px 0 10px; position: sticky; bottom: 0; background: var(--bg); }
.form-actions .btn { flex: 1; }

/* 详情展示 */
.detail-img { width: 100%; border-radius: 10px; margin-bottom: 12px; max-height: 300px; object-fit: contain; background: #1c2230; }
.detail-section {
  background: var(--card); border-radius: 12px; padding: 13px 14px; margin-bottom: 10px;
}
.detail-section h4 { font-size: 12.5px; color: var(--text-3); margin-bottom: 6px; font-weight: 600; }
.detail-section .content-text { font-size: 15px; white-space: pre-wrap; word-break: break-word; }
.ans-wrong { color: var(--danger); font-weight: 600; }
.ans-right { color: var(--success); font-weight: 600; }
.review-history { font-size: 12.5px; color: var(--text-2); }
.review-history .rh-item { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px dashed var(--border); }
.detail-actions { display: flex; gap: 8px; padding-bottom: 14px; flex-wrap: wrap; }
.detail-actions .btn { flex: 1; min-width: 90px; }

/* ================= 复习会话 ================= */
.review-sheet { height: 94vh; }
.review-body { flex: 1; overflow-y: auto; padding: 0 18px; }
.review-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.review-q {
  background: var(--card); border-radius: 14px; padding: 18px 16px;
  font-size: 16px; white-space: pre-wrap; word-break: break-word;
  box-shadow: var(--shadow);
}
.review-q img { max-width: 100%; border-radius: 8px; margin-top: 10px; }
.review-options { display: flex; flex-direction: column; gap: 9px; margin-top: 14px; }
.review-opt {
  text-align: left; padding: 12px 14px; border-radius: 11px;
  background: var(--card); border: 1.5px solid var(--border);
  font-size: 14.5px;
}
.review-opt .k { font-weight: 700; margin-right: 8px; color: var(--primary); }
.review-opt.correct { border-color: var(--success); background: #effaf5; }
.review-opt.wrongpick { border-color: var(--danger); background: #fef0f0; }
.review-answer-box { margin-top: 14px; }
.review-answer-box input {
  width: 100%; padding: 12px 14px; border-radius: 11px;
  border: 1.5px solid var(--border); outline: none; background: var(--card);
}
.review-result {
  margin-top: 14px; border-radius: 12px; padding: 14px;
  font-size: 14px;
}
.review-result.good { background: #effaf5; }
.review-result.bad { background: #fef0f0; }
.review-result h4 { margin-bottom: 6px; }
.review-foot {
  flex: none; padding: 12px 18px calc(14px + var(--safe-bottom));
  display: flex; gap: 10px;
}
.review-foot .btn { flex: 1; }
.similar-note { font-size: 12.5px; color: var(--text-2); margin-top: 10px; background: var(--primary-soft); padding: 10px 12px; border-radius: 10px; }

/* 复习完成页 */
.review-done { text-align: center; padding: 50px 20px; }
.review-done .emoji { font-size: 60px; }
.review-done h2 { margin: 14px 0 6px; }
.review-done p { color: var(--text-2); font-size: 14px; }
.review-done-stats { display: flex; gap: 10px; margin: 22px 0; }
.review-done-stats div {
  flex: 1; background: var(--card); border-radius: 12px; padding: 14px 6px; box-shadow: var(--shadow);
}
.review-done-stats b { display: block; font-size: 22px; }
.review-done-stats span { font-size: 12px; color: var(--text-2); }

/* ================= 报告 ================= */
.segmented {
  display: flex; background: #e7eaf3; border-radius: 11px; padding: 3px; margin-bottom: 14px;
}
.seg-btn { flex: 1; padding: 8px; border-radius: 9px; font-size: 13.5px; color: var(--text-2); font-weight: 600; }
.seg-btn.active { background: #fff; color: var(--primary); box-shadow: 0 1px 4px rgba(0,0,0,.08); }

.report-summary { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 12px; }
.rs-card { background: var(--card); border-radius: 12px; padding: 14px; box-shadow: var(--shadow); }
.rs-card b { font-size: 23px; display: block; }
.rs-card span { font-size: 12.5px; color: var(--text-2); }
.rs-card.accent { background: linear-gradient(135deg,#5b78ff,#6f5cf2); color: #fff; }
.rs-card.accent span { color: rgba(255,255,255,.85); }

.chart-card {
  background: var(--card); border-radius: var(--radius);
  padding: 14px; margin-bottom: 12px; box-shadow: var(--shadow);
}
.chart-card h3 { font-size: 14px; margin-bottom: 10px; }
.chart-box { position: relative; height: 220px; }
.chart-box-tall { height: 260px; }
.chart-box canvas { width: 100% !important; height: 100% !important; }
.chart-row { display: flex; flex-direction: column; gap: 12px; }

.export-card {
  background: var(--card); border-radius: var(--radius); padding: 16px;
  box-shadow: var(--shadow); margin-top: 4px;
}
.export-card h3 { font-size: 15px; }
.export-card p { font-size: 12.5px; color: var(--text-2); margin: 6px 0 14px; }
.export-btns { display: flex; gap: 10px; }
.export-btns .btn { flex: 1; }

/* ================= 我的 ================= */
.me-card {
  display: flex; align-items: center; gap: 14px;
  background: linear-gradient(135deg,#5b78ff,#6f5cf2);
  color: #fff; border-radius: 16px; padding: 18px;
}
.me-avatar {
  width: 54px; height: 54px; border-radius: 50%;
  background: rgba(255,255,255,.22);
  display: grid; place-items: center; font-size: 28px;
}
.me-name { font-size: 18px; font-weight: 700; }
.me-sub { font-size: 12.5px; opacity: .88; margin-top: 2px; }

.me-group { margin-top: 16px; }
.me-group-title { font-size: 12.5px; color: var(--text-3); margin: 0 4px 8px; }
.me-row {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  background: var(--card); padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  text-align: left; font-size: 14.5px;
}
.me-row:first-child { border-radius: 12px 12px 0 0; }
.me-row:last-child { border-radius: 0 0 12px 12px; border-bottom: none; }
.me-row:only-child { border-radius: 12px; }
.me-row.danger { color: var(--danger); }
.me-arrow { color: var(--text-3); font-size: 13px; }
.me-row.static-row { color: var(--text-2); }

/* ================= 对话框 ================= */
.modal-mask.center { align-items: center; justify-content: center; padding: 24px; }
.dialog {
  width: 100%; max-width: 340px;
  background: var(--card); border-radius: 16px; padding: 20px;
  animation: sheetUp .2s;
}
.dialog h3 { font-size: 16px; margin-bottom: 8px; }
.dialog p { font-size: 14px; color: var(--text-2); margin-bottom: 18px; white-space: pre-wrap; }
.dialog-btns { display: flex; gap: 10px; }
.dialog-btns .btn { flex: 1; }

/* ================= Toast ================= */
.toast {
  position: absolute; left: 50%; bottom: 100px;
  transform: translateX(-50%);
  background: rgba(30,35,50,.92); color: #fff;
  padding: 10px 20px; border-radius: 22px;
  font-size: 13.5px; z-index: 100;
  max-width: 82%; text-align: center;
  animation: toastIn .25s;
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 10px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ================= 标签管理弹层 ================= */
.manage-list { display: flex; flex-direction: column; gap: 8px; }
.manage-item {
  background: var(--card); border-radius: 11px; padding: 11px 14px;
  display: flex; align-items: center; gap: 10px;
}
.manage-item input {
  flex: 1; border: none; outline: none; background: none; font-size: 14px;
}
.manage-item .m-dot { width: 12px; height: 12px; border-radius: 50%; flex: none; }
.manage-item .m-icon { font-size: 18px; width: 24px; text-align: center; }

/* ================= AI 智能出题 ================= */
.ai-status-pill{display:inline-block;font-size:11px;padding:2px 8px;border-radius:10px;background:var(--primary-soft);color:var(--primary);margin-left:6px;font-weight:500}
.ai-status-pill.off{background:#f1f1f3;color:var(--text-3)}
.ai-presets{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}
.ai-preset{border:1px solid #e3e6ef;background:#fff;border-radius:14px;padding:4px 10px;font-size:12px;color:var(--text-2);cursor:pointer}
.ai-preset.active{border-color:var(--primary);color:var(--primary);background:var(--primary-soft)}
.ai-tip{font-size:12px;color:var(--text-3);line-height:1.6;margin:4px 0 10px}
.ai-loading{text-align:center;padding:44px 20px;color:var(--text-2)}
.ai-spinner{width:38px;height:38px;border:3.5px solid var(--primary-soft);border-top-color:var(--primary);border-radius:50%;margin:0 auto 14px;animation:ai-spin .8s linear infinite}
@keyframes ai-spin{to{transform:rotate(360deg)}}
.ai-loading .ai-step{font-size:14px;font-weight:500;margin-bottom:6px}
.ai-loading .ai-sub{font-size:12px;color:var(--text-3)}
.ai-error{text-align:center;padding:36px 20px}
.ai-error .ai-err-emoji{font-size:34px;margin-bottom:10px}
.ai-error p{color:var(--danger);font-size:13px;line-height:1.6;margin:0 0 14px;word-break:break-word}
.ai-q-card{border:1px solid #e8ebf4;border-radius:12px;padding:12px 14px;margin-bottom:12px;background:#fff}
.ai-q-head{display:flex;align-items:center;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.ai-q-type{font-size:11px;font-weight:600;padding:2px 8px;border-radius:6px;background:var(--primary-soft);color:var(--primary)}
.ai-q-type.t-fill{background:#e8f8f1;color:#15946a}
.ai-q-type.t-judge{background:#fdf1e0;color:#c77f12}
.ai-q-type.t-essay{background:#f2ebfe;color:#7c4dd6}
.ai-q-diff{font-size:11px;color:var(--warning);letter-spacing:1px}
.ai-q-idx{font-size:12px;color:var(--text-3)}
.ai-q-save{margin-left:auto;border:none;background:none;font-size:12px;color:var(--text-3);cursor:pointer;padding:2px 6px}
.ai-q-save.saved{color:var(--success);cursor:default}
.ai-q-content{font-size:14px;line-height:1.7;white-space:pre-wrap;word-break:break-word}
.ai-opts{margin:8px 0 2px;display:flex;flex-direction:column;gap:7px}
.ai-opt{display:flex;align-items:flex-start;gap:8px;border:1.5px solid #e3e6ef;border-radius:9px;padding:8px 10px;font-size:13.5px;background:#fff;cursor:pointer;text-align:left;width:100%}
.ai-opt .ai-opt-key{font-weight:700;color:var(--primary);flex-shrink:0}
.ai-opt:active{background:var(--primary-soft)}
.ai-opt.correct{border-color:var(--success);background:#eafaf3}
.ai-opt.correct .ai-opt-key{color:var(--success)}
.ai-opt.wrong{border-color:var(--danger);background:#fef0f0}
.ai-opt.wrong .ai-opt-key{color:var(--danger)}
.ai-opt.disabled{pointer-events:none;opacity:.92}
.ai-fill-row{display:flex;gap:8px;margin-top:8px}
.ai-fill-row .form-control{flex:1}
.ai-grade{display:flex;gap:8px;margin-top:8px}
.ai-result{margin-top:10px;border-radius:9px;padding:9px 11px;font-size:13px;line-height:1.65;white-space:pre-wrap}
.ai-result.ok{background:#eafaf3;color:#15755a}
.ai-result.bad{background:#fef0f0;color:#c0392b}
.ai-result b{display:block;margin-bottom:2px}
.ai-result .ai-explain{color:var(--text-2);font-weight:400;margin-top:4px}
.ai-sheet-foot{display:flex;gap:10px;padding:10px 0 0;border-top:1px solid #eef0f6;margin-top:4px}
.ai-sheet-foot .btn{flex:1}
.ai-kp-banner{background:linear-gradient(135deg,#eef1fe,#f4f0ff);border-radius:10px;padding:10px 12px;font-size:13px;margin-bottom:12px;line-height:1.6}
.ai-kp-banner b{color:var(--primary)}
.manage-item .m-del { color: var(--danger); padding: 4px 8px; font-size: 16px; }
.manage-add {
  border: 1.5px dashed var(--border); border-radius: 11px;
  padding: 11px; text-align: center; color: var(--primary);
  font-size: 14px; width: 100%; background: none;
}
.color-picker { display: flex; gap: 8px; flex-wrap: wrap; }
.color-dot { width: 26px; height: 26px; border-radius: 50%; border: 2px solid transparent; }
.color-dot.on { border-color: var(--text); transform: scale(1.12); }

/* ================= 平板/桌面适配 ================= */
@media (min-width: 640px) {
  body { font-size: 15px; }
  .content { padding-bottom: 30px; }
  .view { padding: 20px 24px 30px; }
  .tabbar {
    position: static; order: 0;
    border-radius: 0; border-top: none; border-bottom: 1px solid var(--border);
    height: 56px; padding-bottom: 0;
  }
  .topbar { display: none; }
  .tab { flex-direction: row; gap: 6px; font-size: 14px; }
  .tab span { font-size: 18px; }
  .tab-capture { flex: 0 0 90px; }
  .tab-plus { margin-top: 0; width: 38px; height: 38px; font-size: 22px !important; }
  .stat-grid { grid-template-columns: repeat(4, 1fr); gap: 12px; }
  .report-summary { grid-template-columns: repeat(4, 1fr); }
  .chart-row { flex-direction: row; }
  .chart-row .half { flex: 1; }
  .sheet { border-radius: 18px; max-width: 560px; margin: 0 auto; max-height: 88vh; }
  .modal-mask { align-items: center; padding: 24px; }
  .modal-mask:not(.center) .sheet { border-radius: 18px; }
}
@media (min-width: 900px) {
  body { background: #e9edf6; }
}