/**
 * site/css/site.css —— 粉笔纯净现代设计系统（清爽高对比、活力橙品牌色）
 *
 * 现代在线教育 UI 规范：
 *   --paper #F6F7F9（纯净灰白底）/ --card #FFFFFF（纯白微阴影卡片）
 *   --ink #1D2129（高清晰墨灰正文）/ --sub #4E5969（优雅副文本）
 *   --cinnabar #FF6B35（粉笔标志性活力橙）/ --cinnabar-deep #E85520（深橙操作色）
 *   --cinnabar-soft #FFF2E8（柔和浅橙徽章底）/ --line #E5E6EB（微细边框）
 *
 * 移动端优化：全视口无衬线体排版、柔和聚焦光环、细腻圆角、高质感按钮。
 */

/* ---------------- tokens ---------------- */
:root {
  --paper: #F6F7F9;
  --card: #FFFFFF;
  --ink: #1D2129;
  --sub: #4E5969;
  --muted: #86909C;
  --line: #E5E6EB;
  --line-light: #F2F3F5;

  --cinnabar: #FF6B35;
  --cinnabar-deep: #E85520;
  --gold: #FF7D00;

  --cinnabar-soft: #FFF2E8;
  --gold-soft: #FFF7E8;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  --shadow-strong: 0 6px 20px rgba(0, 0, 0, 0.08);
  --serif: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --radius: 14px;
  --radius-sm: 8px;
  --tabbar-h: 58px;
  --max-w: 760px;
}

* {
  box-sizing: border-box;
}
[hidden] { display: none !important; }

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  /* 375px 视口不横向滚动的兜底：任何长串（URL、base64 之外的正文）都能断行 */
  overflow-x: hidden;
  padding-bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px));
  -webkit-text-size-adjust: 100%;
}

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 99;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  padding: 10px 16px;
}

.topbar-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar-brand {
  display: flex;
  align-items: center;
}

.brand-badge-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #FF783E 0%, #FF5018 100%);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(255, 90, 31, 0.3);
  margin-right: 8px;
  flex-shrink: 0;
}

.topbar-title {
  margin: 0;
  font-family: inherit;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.2px;
  line-height: 1.2;
}

.brand-pill,
.seal-mark {
  display: inline-flex;
  align-items: center;
  font-family: inherit;
  font-size: 11px;
  font-weight: 600;
  color: var(--cinnabar);
  border: 1px solid rgba(255, 90, 31, 0.28);
  background-color: var(--cinnabar-soft);
  padding: 2px 8px;
  border-radius: 999px;
  line-height: 1.3;
  margin-left: 8px;
  letter-spacing: 0.3px;
}

.topbar-tag {
  font-size: 11.5px;
  color: var(--sub);
  background-color: var(--line-light);
  border: 1px solid var(--line);
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.3px;
}

/* ---------------- 页面与卡片 ---------------- */
.page {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 12px 12px 60px;
  overflow-x: hidden;
}

.view[hidden] {
  display: none;
}

.card {
  background-color: var(--card);
  border: 1px solid #E8ECF1;
  border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
  padding: 14px;
  margin-bottom: 12px;
  position: relative;
  max-width: 100%;
  box-sizing: border-box;
}

.card-title {
  display: flex;
  align-items: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: -0.2px;
}

.card-title.mb0 {
  margin-bottom: 0;
}

.card-title::before {
  content: "";
  display: inline-block;
  width: 3.5px;
  height: 14px;
  background: linear-gradient(180deg, var(--cinnabar) 0%, var(--cinnabar-deep) 100%);
  border-radius: 2px;
  margin-right: 8px;
}

/* 粉笔卡片头部通用布局 */
.card-head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 8px;
  flex-wrap: wrap;
}

.card-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.card-title-text {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.2px;
}

.tag-optional {
  font-size: 11px;
  color: var(--muted);
  background-color: var(--line-light);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
  line-height: 1.3;
}

.card-sub-hint {
  font-size: 12px;
  color: var(--muted);
  flex-shrink: 0;
  white-space: nowrap;
}

.btn-text-link {
  background: none;
  border: none;
  font-size: 13px;
  font-weight: 600;
  color: var(--cinnabar);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  flex-shrink: 0;
  white-space: nowrap;
  transition: background-color 0.15s;
}

.btn-text-link:hover {
  background-color: var(--cinnabar-soft);
}

/* 题型选择器 Badge */
.type-selector-badge {
  display: inline-flex;
  align-items: center;
  background-color: var(--cinnabar-soft);
  border: 1px solid rgba(255, 90, 31, 0.28);
  border-radius: 8px;
  padding: 4px 8px;
  max-width: 100%;
}

.type-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--cinnabar);
  margin-right: 6px;
}

.type-badge-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--cinnabar);
}

.type-select {
  border: none;
  background: transparent;
  font-size: 13px;
  font-weight: 700;
  color: var(--cinnabar);
  outline: none;
  cursor: pointer;
  font-family: inherit;
  padding-right: 2px;
}

/* 快速真题练手推荐横条 */
.preset-strip {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  overflow: hidden;
}

.preset-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--sub);
  flex-shrink: 0;
  white-space: nowrap;
}

.preset-chips-scroll {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 2px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex: 1;
  min-width: 0;
}

.preset-chips-scroll::-webkit-scrollbar {
  display: none;
}

.preset-pill {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.preset-pill:hover,
.preset-pill:active {
  background-color: var(--cinnabar-soft);
  border-color: rgba(255, 90, 31, 0.35);
  color: var(--cinnabar);
}

/* 给定材料可折叠容器 */
.material-content {
  transition: all 0.25s ease;
}

.material-content.is-collapsed {
  display: none;
}

/* 考生答题卡核心组件 */
.card-answer-sheet {
  border-color: #E2E6EC;
}

.pill-word-counter {
  font-size: 12px;
  font-weight: 600;
  color: var(--cinnabar);
  background-color: var(--cinnabar-soft);
  border: 1px solid rgba(255, 90, 31, 0.25);
  border-radius: 999px;
  padding: 1px 8px;
  line-height: 1.3;
}

.answer-tools {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--sub);
  background-color: #F7F8FA;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tool-btn:hover {
  background-color: #EEF0F3;
  color: var(--ink);
}

.tool-btn-camera {
  background-color: var(--cinnabar-soft);
  border-color: rgba(255, 90, 31, 0.35);
  color: var(--cinnabar);
  font-weight: 600;
}

.tool-btn-camera:hover {
  background-color: #FFE6D6;
}

.tool-icon {
  vertical-align: -1px;
}

.answer-sheet-canvas {
  margin-top: 8px;
}

.answer-textarea {
  min-height: 200px;
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: 0.2px;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid #E2E6EC;
  background-color: #FFFFFF;
}

.answer-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line-light);
}

.length-status-badge {
  font-size: 12px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 4px;
  background-color: var(--line-light);
  color: var(--muted);
}

.length-status-badge.good {
  background-color: #E8F7F0;
  color: #00B578;
}

.length-status-badge.warn {
  background-color: #FFF4E5;
  color: #FF7D00;
}

.length-status-badge.danger {
  background-color: #FEECEB;
  color: #F53F3F;
}

.length-standard-tip {
  font-size: 11.5px;
  color: var(--muted);
}

/* 粉笔大号主操作按钮 */
.action-submit-card {
  margin: 16px 0 20px;
}

.btn-submit-fenbi {
  width: 100%;
  border: none;
  border-radius: 14px;
  background: linear-gradient(135deg, #FF783E 0%, #FF5018 100%);
  color: #FFFFFF;
  padding: 14px 20px;
  box-shadow: 0 6px 18px rgba(255, 90, 31, 0.28);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-submit-fenbi:active {
  transform: translateY(1px);
  box-shadow: 0 3px 10px rgba(255, 90, 31, 0.22);
}

.btn-submit-fenbi:disabled {
  background: var(--line) !important;
  color: var(--muted) !important;
  cursor: not-allowed;
  box-shadow: none !important;
  transform: none !important;
}

.btn-submit-text {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.btn-submit-sub {
  font-size: 11.5px;
  opacity: 0.92;
  margin-top: 3px;
  font-weight: 400;
}

.text-center {
  text-align: center;
}

.mb-0 {
  margin-bottom: 0 !important;
}

/* ---------------- 排版工具 ---------------- */
.row {
  display: flex;
  align-items: center;
}

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

.col {
  display: flex;
  flex-direction: column;
}

.flex-1 {
  flex: 1;
  min-width: 0;
}

.gap {
  gap: 10px;
}

.mt {
  margin-top: 10px;
}

.mt-s {
  margin-top: 6px;
}

.mb {
  margin-bottom: 10px;
}

.muted {
  color: var(--sub);
  font-size: 13px;
}

.danger {
  color: var(--cinnabar);
}

.gold {
  color: var(--gold);
}

.divider {
  height: 1px;
  background-color: var(--line);
  margin: 10px 0;
}

.empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--sub);
  font-size: 14px;
}

.status-line {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

/* ---------------- 按钮 ---------------- */
.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: 1px solid transparent;
  font-family: inherit;
  transition: all 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #FF783E 0%, #FF5018 100%);
  color: #FFFFFF;
  border-color: #FF5018;
  box-shadow: 0 4px 14px rgba(255, 90, 31, 0.25);
}

.btn-primary:active {
  background: #E84A12;
  border-color: #E84A12;
  box-shadow: 0 2px 6px rgba(255, 90, 31, 0.2);
  transform: translateY(1px);
}

.btn-primary:disabled,
.btn-ghost:disabled {
  background: var(--line) !important;
  border-color: var(--line) !important;
  color: var(--muted) !important;
  cursor: not-allowed;
  box-shadow: none !important;
  transform: none !important;
}

.btn-ghost {
  background-color: #FFFFFF;
  color: var(--cinnabar);
  border: 1px solid rgba(255, 90, 31, 0.35);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.btn-ghost:active {
  background-color: var(--cinnabar-soft);
  transform: translateY(1px);
}

.btn-sm {
  min-height: 34px;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 8px;
}

.btn-block {
  width: 100%;
}

.btn-send {
  min-height: 40px;
  padding: 0 16px;
  flex: 0 0 auto;
  border-radius: 8px;
  background: linear-gradient(135deg, #FF783E 0%, #FF5018 100%);
  color: #FFFFFF;
  border: none;
  font-weight: 600;
}

/* ---------------- 表单 ---------------- */
.field {
  margin-bottom: 14px;
}

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.field-hint {
  display: block;
  font-size: 12px;
  color: var(--sub);
  margin-top: 5px;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.input-box {
  background-color: #FFFFFF;
  border: 1px solid #E2E6EC;
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--ink);
  font-size: 14.5px;
  line-height: 1.7;
  font-family: inherit;
  width: 100%;
  max-width: 100%;
  display: block;
  transition: border-color 0.18s, box-shadow 0.18s;
}

.input-box:focus {
  outline: none;
  background-color: #FFFFFF;
  border-color: var(--cinnabar);
  box-shadow: 0 0 0 3px rgba(255, 90, 31, 0.12);
}

textarea.input-box {
  resize: vertical;
  min-height: 48px;
}

select.input-box {
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--sub) 50%),
    linear-gradient(135deg, var(--sub) 50%, transparent 50%);
  background-position: calc(100% - 16px) 20px, calc(100% - 11px) 20px;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 32px;
}

/* ---------------- 胶囊 / 标签 ---------------- */
.chip {
  display: inline-block;
  padding: 6px 12px;
  margin: 0 8px 8px 0;
  border-radius: 999px;
  background-color: var(--card);
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.4;
  cursor: pointer;
  font-family: inherit;
}

.chip-active {
  background-color: var(--cinnabar-soft);
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.tabs {
  margin: 6px 0 10px;
}

.tag {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11px;
  line-height: 1.6;
  border: 1px solid var(--line);
  color: var(--sub);
  background-color: var(--paper);
}

.tag-red {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
  background-color: var(--cinnabar-soft);
}

.tag-gold {
  color: var(--gold);
  border-color: var(--gold);
  background-color: var(--gold-soft);
}

.tag-ink {
  color: var(--ink);
  border-color: var(--ink);
}

/* 推荐模型方案：行式清单与直连标识 */
.tag-ok {
  color: #2f7d4f;
  border-color: rgba(47, 125, 79, 0.45);
}

.guide-row {
  padding: 12px 0;
}

.guide-row + .guide-row {
  border-top: 1px solid var(--line);
}

.guide-head {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.guide-name {
  font-weight: 600;
  color: var(--ink);
}

.guide-row .row {
  margin-top: 8px;
}

.grid-presets {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}

@media (min-width: 480px) {
  .grid-presets {
    grid-template-columns: repeat(3, 1fr);
  }
}

.preset-cell {
  border: 1px solid var(--line);
  background-color: var(--paper);
  border-radius: var(--radius-sm);
  padding: 8px;
  font-size: 13px;
  cursor: pointer;
  text-align: center;
  font-family: inherit;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.preset-cell.active {
  border-color: var(--cinnabar);
  background-color: var(--cinnabar-soft);
  color: var(--cinnabar);
}

/* ---------------- 分数 ---------------- */
.score-line {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.score-num {
  font-family: var(--serif);
  font-size: 52px;
  line-height: 1;
  font-weight: 800;
  color: var(--cinnabar);
  letter-spacing: -1px;
}

.score-max {
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
}

.grade-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  background-color: var(--cinnabar-soft);
  color: var(--cinnabar);
  border: 1px solid rgba(255, 107, 53, 0.35);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  margin-left: 8px;
}

.dim {
  margin-bottom: 12px;
}

.dim-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 4px;
}

.bar-track {
  height: 8px;
  border-radius: 999px;
  background-color: var(--line);
  overflow: hidden;
}

.bar-fill {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #FF9457 0%, var(--cinnabar) 100%);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.bar-fill-gold {
  background: linear-gradient(90deg, #FFC043 0%, #FF9900 100%);
}

.dim-comment {
  font-size: 12px;
  color: var(--sub);
  margin-top: 3px;
}

/* ---------------- 批注卡 ---------------- */
.issue {
  border: 1px solid #E5E6EB;
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 12px;
  background-color: #FFFFFF;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
}

.issue-quote {
  border-left: 3.5px solid var(--cinnabar);
  background-color: var(--cinnabar-soft);
  color: var(--cinnabar-deep);
  padding: 8px 12px;
  border-radius: 0 8px 8px 0;
  font-size: 13.5px;
  font-weight: 500;
  margin-bottom: 10px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.issue-line {
  font-size: 14px;
  margin: 6px 0;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.issue-label {
  color: var(--sub);
  font-size: 12px;
  margin-right: 6px;
  font-weight: 600;
}

.upgrade-body {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
  overflow-wrap: anywhere;
  padding: 14px 16px;
  background-color: #FFFDF9;
  border: 1px solid #FFE6D2;
  border-radius: 10px;
}

/* ---------------- 聊天气泡 ---------------- */
.bubble {
  display: flex;
  margin-bottom: 12px;
}

.bubble-user {
  justify-content: flex-end;
}

.bubble-body {
  max-width: 86%;
  min-width: 0;
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 15px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.bubble-user .bubble-body {
  background-color: var(--cinnabar-soft);
  border: 1px solid var(--cinnabar);
  color: var(--cinnabar);
  border-bottom-right-radius: 4px;
  white-space: pre-wrap;
}

.bubble-ai .bubble-body {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-bottom-left-radius: 4px;
  box-shadow: var(--shadow);
}

.bubble-time {
  font-size: 11px;
  color: var(--sub);
  margin-bottom: 4px;
}

.bubble-user .bubble-time {
  text-align: right;
}

.cursor::after {
  content: "▍";
  color: var(--cinnabar);
  animation: blink 1s steps(2) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.chat-input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.chat-input-row .input-box {
  flex: 1;
  min-width: 0;
  resize: none;
  max-height: 120px;
}

/* ---------------- 真题两级 ---------------- */
.paper-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
}

.paper-head {
  padding: 10px 12px;
  background-color: var(--paper);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
}

.paper-body {
  padding: 4px 12px 10px;
  border-top: 1px solid var(--line);
}

.q-item {
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}

.q-item:last-child {
  border-bottom: none;
}

.q-title {
  font-size: 13px;
  color: var(--sub);
  margin-bottom: 4px;
}

.q-text {
  font-size: 14px;
  overflow-wrap: anywhere;
}

/* ---------------- 打卡 ---------------- */
.intro-title {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 2px;
}

.paper-title {
  font-size: 14px;
  font-weight: 600;
  overflow-wrap: anywhere;
  margin-bottom: 2px;
}

.keys {
  margin-top: 6px;
}

.key {
  display: inline-block;
  padding: 3px 8px;
  margin: 0 6px 6px 0;
  border-radius: 8px;
  background-color: var(--cinnabar-soft);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.checkin-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 12px;
}

.progress-track {
  margin-bottom: 10px;
}

.checkin-cell {
  border: 1px solid var(--line);
  background-color: var(--paper);
  border-radius: 8px;
  padding: 6px 2px;
  font-size: 12px;
  text-align: center;
  cursor: pointer;
  font-family: inherit;
  color: var(--ink);
}

.checkin-cell.done {
  border-color: var(--cinnabar);
  background-color: var(--cinnabar-soft);
  color: var(--cinnabar);
}

/* ---------------- 历史 ---------------- */
.history-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px;
  margin-bottom: 8px;
  cursor: pointer;
  background-color: var(--paper);
}

.history-title {
  font-size: 14px;
  overflow-wrap: anywhere;
  margin-bottom: 3px;
}

.history-meta {
  display: flex;
  gap: 8px;
  font-size: 12px;
  color: var(--sub);
  flex-wrap: wrap;
  align-items: center;
}

.history-del {
  margin-left: auto;
  min-height: 28px;
  padding: 0 10px;
  font-size: 12px;
}

/* ---------------- 提示条 / 弹层 ---------------- */
.alert {
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 13px;
  margin: 8px 0;
  overflow-wrap: anywhere;
}

.alert-danger {
  border: 1px solid var(--cinnabar);
  background-color: var(--cinnabar-soft);
  color: var(--cinnabar);
}

.alert-ok {
  border: 1px solid var(--gold);
  background-color: var(--gold-soft);
  color: var(--gold);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--tabbar-h) + 24px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  background-color: rgba(43, 42, 38, 0.92);
  color: #FFFFFF;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 999px;
  z-index: 60;
  max-width: 84vw;
  text-align: center;
}

.modal-mask {
  position: fixed;
  inset: 0;
  background-color: rgba(43, 42, 38, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 200;
}

.modal-mask[hidden] {
  display: none;
}

.modal {
  background-color: var(--card);
  border-radius: var(--radius);
  padding: 18px 16px;
  width: 100%;
  max-width: 340px;
  box-shadow: var(--shadow-strong);
}

/* ---------------- 底栏 ---------------- */
.bottom-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px));
  background-color: var(--card);
  border-top: 1px solid var(--line);
  padding: 8px 12px;
  z-index: 20;
}

.bottom-bar[hidden] {
  display: none;
}

.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background-color: var(--card);
  border-top: 1px solid var(--line);
  display: flex;
  z-index: 30;
}

.tab {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 11px;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 0 3px;
  transition: all 0.18s ease;
  user-select: none;
}

.tab-icon {
  width: 20px;
  height: 20px;
  stroke: var(--muted);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.18s, transform 0.18s;
}

.tab-label {
  line-height: 1.1;
  letter-spacing: 0.5px;
}

.tab.active {
  color: var(--cinnabar);
  font-weight: 600;
}

.tab.active .tab-icon {
  stroke: var(--cinnabar);
  transform: translateY(-1px);
}

/* 聊天页需要给底栏与固定输入区让位 */
body.has-chat-bar {
  padding-bottom: calc(var(--tabbar-h) + 62px + env(safe-area-inset-bottom, 0px));
}

/* ---------------- markdown 渲染 ---------------- */
.md {
  font-size: 15px;
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.md-h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  margin: 16px 0 8px;
  padding-left: 8px;
  border-left: 3px solid var(--cinnabar);
  line-height: 1.5;
}

.md-h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 12px 0 6px;
}

.md-p {
  font-size: 15px;
  color: var(--ink);
  margin: 6px 0;
  line-height: 1.8;
}

.md-li {
  font-size: 15px;
  color: var(--ink);
  margin: 5px 0;
  padding-left: 16px;
  line-height: 1.8;
  position: relative;
}

.md-li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--cinnabar);
}

.md-quote {
  border-left: 3px solid var(--cinnabar);
  background-color: var(--cinnabar-soft);
  color: var(--cinnabar);
  padding: 8px 10px;
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  margin: 8px 0;
}

.md-hr {
  height: 1px;
  background-color: var(--line);
  margin: 14px 0;
}

/* 手机交互：大触控区、可缩放文本和安全区留白。 */
button, a, select { touch-action: manipulation; }
.module-intro { padding: 14px 4px 20px; }
.module-eyebrow { color: var(--cinnabar-deep); font-size: 12px; font-weight: 600; letter-spacing: .4px; }
.module-intro h2 { margin: 8px 0; font-size: 23px; line-height: 1.4; letter-spacing: -.6px; }
.module-intro p { margin: 0 0 12px; color: var(--sub); font-size: 14px; }
.official-badge { display: inline-flex; padding: 5px 10px; border-radius: 20px; background: #fff0e6; color: #a74918; font-size: 12px; }
.official-card { background: linear-gradient(145deg, #fff7ef, #fff); border-color: #f8dcc8; }
.official-card h2 { margin: 6px 0; font-size: 24px; }
.my-shortcuts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 12px; }
.my-shortcuts a { padding: 16px; background: white; border: 1px solid var(--line); border-radius: 14px; color: var(--ink); font-weight: 600; text-decoration: none; }
.my-shortcuts span { display: block; color: var(--sub); font-size: 12px; font-weight: 400; margin-top: 4px; }
.chat-input-row { max-width: var(--max-w); margin: auto; }
@media (max-width: 600px) {
  :root { --tabbar-h: 64px; }
  .topbar { padding: 12px 16px; }
  .topbar-title { font-size: 19px; white-space: nowrap; }
  .topbar-tag { display: none; }
  .topbar-brand { width: 100%; }
  .brand-pill { margin-left: auto; font-size: 10px; }
  .page { padding: 12px 16px 28px; }
  .card { padding: 16px; border-radius: 16px; margin-bottom: 14px; }
  .input-box, .type-select { font-size: 16px; }
  .input-box { padding: 12px; }
  .type-select { min-height: 38px; }
  textarea.answer-textarea { min-height: 260px; line-height: 1.85; }
  .card-head-row { gap: 12px; }
  .answer-tools { width: 100%; display: grid; grid-template-columns: 1.3fr 1fr .7fr; gap: 8px; }
  .tool-btn { min-height: 44px; justify-content: center; font-size: 13px; }
  .btn-text-link, .preset-pill, .chip, .preset-cell, .checkin-cell, .history-del, .btn-sm { min-height: 44px; }
  .preset-strip { flex-direction: column; align-items: stretch; }
  .preset-chips-scroll { width: 100%; padding: 2px 0; }
  .preset-pill { font-size: 12px; }
  .answer-footer-row { flex-wrap: wrap; gap: 8px; }
  .btn-submit-fenbi { min-height: 64px; }
  .btn-submit-sub { font-size: 12px; }
  .tabbar .tab[data-view="study"], .tabbar .tab[data-view="history"] { display: none; }
  .tab { font-size: 12px; gap: 5px; }
  .tab-icon { width: 23px; height: 23px; }
  .bottom-bar { padding: 10px 16px; }
  body.keyboard-open .tabbar { visibility: hidden; }
  body.keyboard-open .bottom-bar { bottom: var(--keyboard-offset, 0px); }
  .chat-input-row { align-items: end; gap: 10px; }
  #chat-input { max-height: 140px; font-size: 16px; }
  .btn-send { min-height: 48px; }
  body.has-chat-bar { padding-bottom: calc(var(--tabbar-h) + 84px + env(safe-area-inset-bottom, 0px)); }
  .bubble-body { max-width: 94%; padding: 14px; }
  .modal-mask { padding: 20px; }
  .modal { padding: 24px; max-height: calc(100dvh - 40px); overflow-y: auto; }
  .row.gap { flex-wrap: wrap; }
  #view-settings .row.gap > button { flex: 1; min-height: 48px; }
  .checkin-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 360px) {
  .page { padding-left: 12px; padding-right: 12px; }
  .card { padding: 14px; }
  .module-intro h2 { font-size: 21px; }
  .brand-pill { display: none; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }