/* ===== 设计 Tokens：暖纸课堂 ===== */
:root {
  /* 主色：墨绿（前排） / 琥珀（回答） */
  --primary: #0f766e;
  --primary-hover: #0d5f58;
  --primary-soft: #ccfbf1;
  --front: #059669;
  --front-hover: #047857;
  --front-soft: #d1fae5;
  --answer: #d97706;
  --answer-hover: #b45309;
  --answer-soft: #fef3c7;

  /* 暖纸底色 */
  --bg: #f6f4ef;
  --surface: #fffdf8;
  --border: #e6e1d5;
  --border-strong: #cfc8b8;

  /* 墨色文字 */
  --text: #292524;
  --text-2: #57534e;
  --text-3: #a8a29e;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(41, 37, 36, 0.05), 0 4px 16px rgba(41, 37, 36, 0.05);
  --shadow-md: 0 8px 32px rgba(41, 37, 36, 0.1), 0 2px 8px rgba(41, 37, 36, 0.05);

  --gap: 16px;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-num: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  /* 细腻的纸纹颗粒 */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
}

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

/* ===== 顶部栏 ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  padding: 16px 22px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  border-top: 3px solid var(--primary);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.class-selector {
  display: flex;
  align-items: center;
  gap: 8px;
}

.class-selector-label {
  font-size: 14px;
  color: var(--text-2);
  font-weight: 500;
}

.class-select {
  padding: 9px 34px 9px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%230f766e' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 10px center;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.cloud-desc {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.6;
  margin: 0 0 14px;
}

.class-select:hover {
  border-color: var(--border-strong);
}

/* 顶部右侧：存储与云备份状态 */
.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.storage-status {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--bg);
  color: var(--text-2);
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.storage-status.ok {
  background: var(--front-soft);
  color: var(--front-hover);
  border-color: transparent;
}

.storage-status.error {
  background: #fef2f2;
  color: #dc2626;
  border-color: transparent;
  animation: pulse-error 2s infinite;
}

@keyframes pulse-error {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.cloud-status.ok { color: var(--front-hover); }
.cloud-status.syncing { color: var(--answer); }
.cloud-status.error { color: #dc2626; }
.cloud-status.off { color: var(--text-3); }

.class-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

.date-label {
  color: var(--text-3);
  font-size: 13px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

.topbar-right {
  display: flex;
  gap: 8px;
}

/* ===== 操作栏 ===== */
.actionbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--surface);
  padding: 14px 22px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  flex-wrap: wrap;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 280px;
}

.search-box svg {
  color: var(--text-3);
  flex-shrink: 0;
}

.search-box input {
  flex: 1;
  min-width: 0;
  padding: 9px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  outline: none;
  background: var(--surface);
  transition: border-color 0.15s, box-shadow 0.15s;
}

/* 搜索框内的 chip 和按钮保持原尺寸，空间不足时由输入框收缩 */
.search-box .chip,
.search-box .btn {
  flex-shrink: 0;
}

.search-box input::placeholder {
  color: var(--text-3);
}

.search-box input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

/* 公平性筛选 chip */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-2);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}

.chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.chip.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.chip .chip-count {
  background: rgba(0, 0, 0, 0.06);
  border-radius: 999px;
  padding: 0 7px;
  font-size: 11px;
  line-height: 17px;
  font-family: var(--font-num);
}

.chip.active .chip-count {
  background: rgba(255, 255, 255, 0.25);
}

.btn-export {
  white-space: nowrap;
}

.action-buttons {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.action-buttons .btn {
  flex-shrink: 0;
}

.selected-count {
  color: var(--text-2);
  font-size: 13px;
  font-family: var(--font-num);
}

.selected-count strong {
  display: inline-block;
  min-width: 18px;
  text-align: center;
  padding: 1px 8px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 15px;
  border-radius: 999px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  font-family: inherit;
  letter-spacing: 0.2px;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 2px 0 var(--primary-hover);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-front {
  background: var(--front);
  box-shadow: 0 2px 0 var(--front-hover);
}

.btn-front:hover {
  background: var(--front-hover);
  box-shadow: 0 2px 0 #065f46;
}

.btn-front:active {
  transform: translateY(2px);
  box-shadow: none;
}

.btn-answer {
  background: var(--answer);
  box-shadow: 0 2px 0 var(--answer-hover);
}

.btn-answer:hover {
  background: var(--answer-hover);
  box-shadow: 0 2px 0 #92400e;
}

.btn-answer:active {
  transform: translateY(2px);
  box-shadow: none;
}

.btn-minus {
  background: #dc2626;
  box-shadow: 0 2px 0 #991b1b;
}

.btn-minus:hover {
  background: #b91c1c;
  box-shadow: 0 2px 0 #7f1d1d;
}

.btn-minus:active {
  transform: translateY(2px);
  box-shadow: none;
}

.btn-ghost {
  background: var(--surface);
  color: var(--text-2);
  border: 1.5px solid var(--border);
  box-shadow: 0 1px 2px rgba(41, 37, 36, 0.04);
}

.btn-ghost:hover {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-small {
  padding: 5px 10px;
  font-size: 12px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

/* ===== 主体内容 ===== */
.main-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--gap);
}

/* ===== 学生名单 ===== */
.student-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.admin-class-group {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  border: 1px solid var(--border);
}

.admin-class-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 18px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.admin-class-header:hover {
  background: #edeae3;
}

.admin-class-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.collapse-arrow {
  color: var(--text-3);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

.admin-class-group.collapsed .collapse-arrow {
  transform: rotate(-90deg);
}

.admin-class-name {
  font-weight: 700;
  color: var(--text);
  font-size: 14px;
  letter-spacing: 0.3px;
}

.admin-class-stats {
  font-size: 12px;
  color: var(--text-3);
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

.admin-class-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.select-class-btn {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
}

.select-class-btn.btn-active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.select-class-btn.btn-active:hover {
  background: var(--primary-hover);
}

.student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(112px, 1fr));
  gap: 10px;
  padding: 14px;
}

.admin-class-group.collapsed .student-grid {
  display: none;
}

.student-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 11px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--surface);
  user-select: none;
}

.student-card:hover {
  border-color: var(--border-strong);
  background: var(--bg);
  transform: translateY(-1px);
  box-shadow: 0 3px 10px rgba(41, 37, 36, 0.06);
}

.student-card.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 2px 8px rgba(15, 118, 110, 0.1);
}

.student-card input[type="checkbox"] {
  accent-color: var(--primary);
  cursor: pointer;
  flex-shrink: 0;
  pointer-events: none;
  width: 16px;
  height: 16px;
}

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

.student-name {
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.student-score {
  font-size: 11px;
  color: var(--text-3);
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

.student-card.selected .student-score {
  color: var(--primary);
  font-weight: 600;
}

/* 负分显示 */
.student-score.negative {
  color: #dc2626;
  font-weight: 600;
}

.student-card.selected .student-name {
  color: var(--primary-hover);
}

/* ===== 快速输入区 ===== */
.quick-input-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: fit-content;
  position: sticky;
  top: 16px;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
  letter-spacing: 0.3px;
}

.panel-title svg {
  color: var(--primary);
}

.panel-hint {
  font-size: 12px;
  color: var(--text-3);
  line-height: 1.6;
}

.panel-hint code {
  background: var(--bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 11px;
  color: var(--text-2);
  font-family: var(--font-num);
}

#quickInput {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  line-height: 1.6;
  background: var(--surface);
  transition: border-color 0.15s, box-shadow 0.15s;
}

#quickInput:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

.quick-input-actions {
  display: flex;
  gap: 8px;
}

.quick-input-actions .btn {
  flex: 1;
  justify-content: center;
}

.match-result {
  font-size: 12px;
  min-height: 20px;
}

.match-result .matched {
  color: var(--front-hover);
  font-weight: 600;
}

.match-result .unmatched {
  color: #dc2626;
}

.match-result .unmatched-item {
  display: inline-block;
  background: #fef2f2;
  padding: 1px 6px;
  border-radius: 4px;
  margin: 2px;
}

.match-result .match-ambiguous {
  margin-top: 6px;
  padding: 6px 8px;
  background: #fff7ed;
  border: 1px solid #fdba74;
  border-radius: 6px;
  color: #c2410c;
  font-weight: 600;
  line-height: 1.5;
}

.match-result .match-preview {
  margin-top: 6px;
  color: var(--text-3);
  line-height: 1.6;
  word-break: break-all;
}

.match-result .preview-class {
  color: var(--text-3);
  opacity: 0.7;
  font-size: 11px;
  margin-left: 2px;
}

/* ===== 操作日志 ===== */
.log-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 18px;
}

.log-panel .panel-title {
  margin-bottom: 12px;
}

.log-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 260px;
  overflow-y: auto;
  padding-right: 4px;
}

.log-list::-webkit-scrollbar { width: 4px; }
.log-list::-webkit-scrollbar-track { background: transparent; }
.log-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; }

.log-empty {
  text-align: center;
  color: var(--text-3);
  padding: 28px;
  font-size: 13px;
}

.log-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg);
  border-radius: 10px;
  border-left: 3px solid var(--border);
  transition: transform 0.15s;
}

.log-item:hover {
  transform: translateX(2px);
}

.log-item.log-front {
  border-left-color: var(--front);
}

.log-item.log-answer {
  border-left-color: var(--answer);
}

.log-item.log-minus {
  border-left-color: #dc2626;
}

.log-time {
  font-size: 11px;
  color: var(--text-3);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-num);
}

.log-detail {
  flex: 1;
  font-size: 13px;
  color: var(--text-2);
}

.log-detail .log-type {
  font-weight: 600;
}

.log-detail .log-type.front {
  color: var(--front-hover);
}

.log-detail .log-type.answer {
  color: var(--answer-hover);
}

.log-detail .log-type.minus {
  color: #dc2626;
}

.log-detail .log-names {
  color: var(--text-3);
  font-size: 12px;
}

.log-undo {
  flex-shrink: 0;
}

/* ===== 弹窗 ===== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(41, 37, 36, 0.35);
  backdrop-filter: blur(2px);
}

.modal-content {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  width: 440px;
  max-width: 92vw;
  max-height: 88vh;      /* 小屏幕上不再把底部按钮顶出屏幕 */
  display: flex;
  flex-direction: column;
  z-index: 1;
  border: 1px solid var(--border);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.btn-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-3);
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.btn-close:hover {
  background: var(--border);
  color: var(--text);
}

.modal-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;      /* 内容超高时只滚动正文，底部按钮始终可见 */
  min-height: 0;
}

.modal-header,
.modal-footer {
  flex-shrink: 0;
}

.form-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.form-row label {
  flex: 1;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
}

.form-row input[type="number"] {
  width: 70px;
  padding: 7px 10px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  text-align: center;
  outline: none;
  background: var(--surface);
  font-family: var(--font-num);
}

.form-row input[type="number"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

.form-row input[type="text"] {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  outline: none;
  background: var(--surface);
}

.form-row input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

.form-unit {
  color: var(--text-3);
  font-size: 13px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 22px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

/* 同步面板：三个按钮挤在一行，主按钮必须完整可见、可点 */
.usb-sync-footer {
  flex-wrap: wrap;
  gap: 8px;
}

.usb-sync-footer .btn {
  padding: 8px 12px;
  font-size: 13px;
}

.usb-sync-footer #usbSyncDisconnectBtn {
  margin-right: auto;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-120px);
  background: var(--text);
  color: #fff;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  z-index: 200;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-md);
  letter-spacing: 0.2px;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.success {
  background: var(--front);
}

.toast.error {
  background: #dc2626;
}

/* ===== 随机选人弹窗 ===== */
.random-modal {
  width: 520px;
}

.random-scope {
  display: flex;
  gap: 20px;
  justify-content: center;
}

.scope-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-2);
  cursor: pointer;
}

.scope-label input[type="radio"] {
  accent-color: var(--primary);
  cursor: pointer;
}

.random-display {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 140px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 2px dashed var(--border-strong);
  overflow: hidden;
  position: relative;
}

.random-display::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(15,118,110,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.random-placeholder {
  color: var(--text-3);
  font-size: 14px;
}

.random-name {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 6px;
  transition: opacity 0.05s;
  font-family: var(--font-display);
}

.random-name.rolling {
  animation: shake 0.1s infinite;
}

.random-name.final {
  animation: popIn 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
  color: var(--answer-hover);
}

@keyframes shake {
  0% { transform: translateX(-3px); }
  50% { transform: translateX(3px); }
  100% { transform: translateX(-3px); }
}

@keyframes popIn {
  0% { transform: scale(0.5); opacity: 0; }
  60% { transform: scale(1.12); }
  100% { transform: scale(1); opacity: 1; }
}

.random-info {
  text-align: center;
  font-size: 13px;
  color: var(--text-3);
  min-height: 18px;
}

.random-info .info-class {
  color: var(--text-2);
  font-weight: 500;
}

.random-info .info-score {
  color: var(--primary);
  font-weight: 600;
  font-family: var(--font-num);
}

/* 随机选人弹窗的加分/减分区 */
.random-score-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.random-score-actions input[type="number"] {
  width: 60px;
  padding: 8px 10px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  text-align: center;
  outline: none;
  background: var(--surface);
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

.random-score-actions input[type="number"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

/* ===== 登录层 ===== */
.login-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  padding: 20px;
}

.login-overlay.hidden {
  display: none;
}

.login-card {
  width: 400px;
  max-width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 36px 32px 28px;
  text-align: center;
}

.login-logo {
  color: var(--primary);
  margin-bottom: 10px;
}

.login-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 1px;
}

.login-subtitle {
  font-size: 13px;
  color: var(--text-3);
  margin: 6px 0 22px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}

.login-form input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  outline: none;
  background: var(--surface);
  font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.login-form input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

.login-error {
  font-size: 12px;
  color: #dc2626;
  min-height: 16px;
  line-height: 1.4;
}

.login-form .btn-primary {
  margin-top: 4px;
  padding: 10px 16px;
}

.login-notice {
  margin: 0 0 14px;
  padding: 12px 14px;
  border: 1px solid var(--warn-border, #f0c36d);
  background: var(--warn-bg, #fff8e6);
  border-radius: 10px;
  text-align: left;
}

.login-notice-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.login-notice-text {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-2);
  word-break: break-all;
  margin-bottom: 10px;
}

.login-link {
  margin-top: 12px;
  background: none;
  border: none;
  padding: 4px;
  color: var(--primary);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.login-link:hover { color: var(--primary-hover); }

.reset-panel {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  display: flex;
  flex-direction: column;
  gap: 9px;
  text-align: left;
}

.reset-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.reset-panel input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  box-sizing: border-box;
}

.reset-panel input:focus {
  outline: none;
  border-color: var(--primary);
}

.reset-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.login-error.ok { color: #1a7f4b; }

/* ===== 云端 ⇄ U盘 同步弹窗 ===== */
.usb-sync-compare {
  display: flex;
  align-items: stretch;
  gap: 10px;
}

.usb-sync-side {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-align: center;
}

.usb-sync-side-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-2);
  margin-bottom: 6px;
}

.usb-sync-side-info {
  font-size: 12px;
  color: var(--text-2);
  font-family: var(--font-num);
  line-height: 1.5;
}

.usb-sync-arrow {
  align-self: center;
  font-size: 20px;
  color: var(--primary);
  font-weight: 700;
}

.usb-sync-hint {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin: 0;
}

/* ===== 离线待同步横幅 ===== */
.offline-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: #fff7ed;
  border: 1px solid #fdba74;
  border-radius: var(--radius);
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  color: #c2410c;
}

.offline-banner .btn {
  background: var(--surface);
}

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .main-content {
    grid-template-columns: 1fr;
  }

  .quick-input-panel {
    position: static;
  }

  .actionbar {
    flex-direction: column;
    align-items: stretch;
  }

  .action-buttons {
    justify-content: flex-end;
  }
}