:root {
  --primary: #4A6CF7;
  --primary-light: #EEF1FE;
  --primary-dark: #3B5DE7;
  --success: #10B981;
  --success-light: #ECFDF5;
  --danger: #EF4444;
  --danger-light: #FEF2F2;
  --warning: #F59E0B;
  --warning-light: #FFFBEB;
  --bg: #F5F7FB;
  --card: #FFFFFF;
  --text: #1F2937;
  --text-muted: #9CA3AF;
  --text-dim: #6B7280;
  --border: #E5E7EB;
  --radius: 10px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 2px 8px rgba(74,108,247,0.05);
  --shadow-hover: 0 2px 6px rgba(0,0,0,0.04), 0 6px 18px rgba(74,108,247,0.08);
  --sidebar-w: 280px;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ═══════════════════════════════════════════
   Layout
   ═══════════════════════════════════════════ */

.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ═══════════════════════════════════════════
   Sidebar
   ═══════════════════════════════════════════ */

.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100vh;
  background: var(--card);
  border-right: 0.5px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
}

/* ── User ── */

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 20px 16px;
}

.user-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--primary);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 600;
  flex-shrink: 0;
}

.user-info {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.user-tag {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
}

.btn-logout-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.2s;
  flex-shrink: 0;
}

.btn-logout-icon:hover {
  background: var(--danger-light);
  color: var(--danger);
}

/* ── Stats ── */

.sidebar-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 0 20px 20px;
}

.stat-item {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 12px 8px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
}

/* ═══════════════════════════════════════════
   Calendar Widget
   ═══════════════════════════════════════════ */

.calendar-widget {
  padding: 0 16px 12px;
}

.cal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.cal-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.cal-nav:hover { background: var(--bg); color: var(--primary); }

.cal-month-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.cal-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 4px;
  padding: 0 2px;
}

.cal-weekdays span {
  padding: 4px 0;
}

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}

.cal-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 500;
  border-radius: 6px;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
  border: 1.5px solid transparent;
}

.cal-cell:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.cal-cell.other-month {
  color: var(--border);
  cursor: default;
}

.cal-cell.other-month:hover {
  background: transparent;
  border-color: transparent;
  color: var(--border);
}

.cal-cell.today {
  font-weight: 700;
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-light);
}

.cal-cell.selected {
  font-weight: 600;
  color: var(--primary-dark);
  border-color: var(--primary-dark);
  background: #DDE3FD;
}

.cal-cell.selected.today {
  font-weight: 700;
  color: #FFF;
  border-color: var(--primary-dark);
  background: var(--primary);
}

.cal-cell::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border);
}

/* 达标 — 绿色 */
.cal-cell.pass::after {
  background: var(--success);
}

/* 未达标 — 黄色 */
.cal-cell.fail::after {
  background: var(--warning);
}

.cal-cell.other-month::after {
  display: none;
}

.cal-cell.today.pass::after,
.cal-cell.today.fail::after {
  bottom: 2px;
}

.cal-legend {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 10px;
  font-size: 10px;
  color: var(--text-muted);
}

.legend-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.legend-dot.pass  { background: var(--success); }
.legend-dot.fail  { background: var(--warning); }
.legend-dot.empty { background: var(--border); }

/* ═══════════════════════════════════════════
   Sidebar Nav
   ═══════════════════════════════════════════ */

.sidebar-nav {
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}

.nav-item:hover {
  background: var(--bg);
  color: var(--text);
}

.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.nav-item .icon-sm {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
}

/* ── Sidebar Footer ── */

.sidebar-footer {
  padding: 12px 20px;
  border-top: 0.5px solid var(--border);
}

.btn-new-day {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 11px;
  border: none;
  background: var(--primary);
  color: #FFF;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  box-shadow: 0 2px 8px rgba(74,108,247,0.20);
}

.btn-new-day:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 14px rgba(74,108,247,0.30);
}

/* ═══════════════════════════════════════════
   Main Content
   ═══════════════════════════════════════════ */

.main-content {
  flex: 1;
  min-width: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 28px 40px 40px;
}

/* ── Panels ── */

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.panel-header h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}

.check-date-input {
  padding: 8px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: inherit;
  color: var(--text);
  background: var(--card);
  transition: border-color 0.2s;
}

.check-date-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74,108,247,0.10);
}

/* ═══════════════════════════════════════════
   Daily Grid — 三栏
   ═══════════════════════════════════════════ */

.daily-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

/* 立志 — 左上 */
.card-morning {
  grid-column: 1;
  grid-row: 1;
}

/* 改过 — 左下 */
.card-evening {
  grid-column: 1;
  grid-row: 2;
}

/* 勤学 — 右列跨2行 */
.card-study {
  grid-column: 2;
  grid-row: 1 / 3;
}

/* ── Cards ── */

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
  box-shadow: var(--shadow);
  border: 0.5px solid var(--border);
  transition: box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.card:hover { box-shadow: var(--shadow-hover); }

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

.card-head h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.icon-h2 {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--primary);
}

.card-desc {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ═══════════════════════════════════════════
   Dynamic Items
   ═══════════════════════════════════════════ */

.item-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 8px;
}

.item-row input[type="text"],
.item-row textarea {
  flex: 1;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  resize: vertical;
  transition: border-color 0.2s, background 0.2s;
}

.item-row input[type="text"]:focus,
.item-row textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--card);
  box-shadow: 0 0 0 3px rgba(74,108,247,0.08);
}

.item-row textarea { min-height: 38px; }

.item-row .idx {
  font-size: 12px;
  color: var(--text-muted);
  min-width: 20px;
  padding-top: 10px;
  font-weight: 600;
  text-align: right;
}

.btn-del {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  padding: 6px 2px;
  line-height: 1;
  border-radius: 6px;
  transition: background 0.2s;
  display: inline-flex;
  align-items: center;
}

.btn-del:hover { background: var(--danger-light); }
.btn-del .icon-sm { width: 16px; height: 16px; }

/* 责善改过 横排双输入 */

.evening-row {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 10px 10px;
  margin-bottom: 10px;
  background: var(--bg);
  transition: border-color 0.2s;
}

.evening-row:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74,108,247,0.06);
}

.evening-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.evening-header .idx {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

.mistake-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  align-items: start;
}

.mistake-row .col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mistake-row .col label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  padding-left: 2px;
}

.mistake-row input[type="text"] { width: 100%; }

/* 勤学预设项目 */

.preset-item {
  padding: 6px 0;
}

.preset-check {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.preset-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  flex-shrink: 0;
  cursor: pointer;
}

.preset-name {
  font-size: 13px;
  color: var(--text-dim);
  transition: color 0.2s;
  line-height: 1.4;
}

.preset-check input:checked + .preset-name {
  color: var(--text);
  font-weight: 500;
  text-decoration: line-through;
  text-decoration-color: var(--primary);
  text-decoration-thickness: 2px;
}

.preset-note {
  display: none;
  width: 100%;
  margin-top: 6px;
  margin-left: 24px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  resize: none;
  min-height: 28px;
  transition: border-color 0.2s;
  box-sizing: border-box;
}

.preset-note:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--card);
  box-shadow: 0 0 0 2px rgba(74,108,247,0.06);
}

.preset-item.active .preset-note {
  display: block;
}

/* Buttons */

.btn-add {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 100%;
  padding: 9px;
  margin-top: auto;
  border: 1.5px dashed var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-add:hover { background: #DDE3FD; border-color: var(--primary-dark); }

.btn-save {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 14px;
  border: none;
  background: var(--primary);
  color: #FFF;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  letter-spacing: 0.3px;
  box-shadow: 0 2px 8px rgba(74,108,247,0.25);
}

.btn-save:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(74,108,247,0.35);
}

.btn-save:active { transform: translateY(0); }

/* ═══════════════════════════════════════════
   Weekly Panel
   ═══════════════════════════════════════════ */

.week-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 8px 0 20px;
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  border: 1.5px solid var(--border);
  background: var(--card);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text);
  transition: all 0.2s;
  font-family: inherit;
}

.btn-nav:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

#week-label {
  font-size: 14px;
  font-weight: 600;
  min-width: 200px;
  text-align: center;
  color: var(--text);
}

.weekly-overview {
  display: flex;
  align-items: center;
  gap: 40px;
  padding: 20px 0;
  justify-content: center;
}

.score-circle {
  position: relative;
  width: 140px;
  height: 140px;
  flex-shrink: 0;
}

.score-svg {
  width: 140px;
  height: 140px;
}

.score-svg circle {
  transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.score-inner {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: baseline;
  justify-content: center;
}

.score-num {
  font-size: 40px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.score-unit {
  font-size: 15px;
  color: var(--text-muted);
  margin-left: 2px;
  font-weight: 500;
}

.score-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.score-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.score-stats {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.week-days-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin-top: 24px;
}

.day-cell {
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 12px 8px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
  border-top: 3px solid transparent;
}

.day-cell:hover { box-shadow: var(--shadow-hover); }

.day-cell.pass  { border-top-color: var(--success); }
.day-cell.fail  { border-top-color: var(--warning); }
.day-cell.empty { border-top-color: var(--border); opacity: 0.5; }

.day-cell .day-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 500;
}

.day-cell .day-date {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.day-cell .day-score {
  font-size: 18px;
  font-weight: 700;
}

.day-cell.pass .day-score  { color: var(--success); }
.day-cell.fail .day-score  { color: var(--warning); }
.day-cell.empty .day-score { color: var(--text-muted); }

.day-cell .day-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 600;
  margin-top: 4px;
}

.day-cell.pass .day-badge  { background: var(--success-light); color: var(--success); }
.day-cell.fail .day-badge  { background: var(--warning-light); color: #D97706; }
.day-cell.empty .day-badge { background: var(--bg); color: var(--text-muted); }

/* ═══════════════════════════════════════════
   History Panel
   ═══════════════════════════════════════════ */

.history-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 4px;
}

.history-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 0.5px solid var(--border);
}

.history-card:hover { box-shadow: var(--shadow-hover); }

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

.history-card .info .date {
  font-weight: 600;
  font-size: 14px;
  color: var(--primary);
}

.history-card .info .preview {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  line-height: 1.4;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.history-card .info .preview span {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.history-card .btn-del-history {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--danger-light);
  border: none;
  color: var(--danger);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  flex-shrink: 0;
  margin-left: 14px;
  transition: all 0.2s;
  font-family: inherit;
}

.history-card .btn-del-history:hover { background: var(--danger); color: #FFF; }

/* Empty state */

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
  font-size: 14px;
}

.empty-state .empty-icon {
  margin-bottom: 10px;
  opacity: 0.4;
}

.empty-state .empty-icon svg {
  width: 44px;
  height: 44px;
}

/* ═══════════════════════════════════════════
   Toast
   ═══════════════════════════════════════════ */

.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.12);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.toast.success { background: var(--success); color: #FFF; }
.toast.error   { background: var(--danger);   color: #FFF; }
.toast.info    { background: var(--primary);  color: #FFF; }

/* ═══════════════════════════════════════════
   SVG icons helpers
   ═══════════════════════════════════════════ */

.icon-sm  { width: 14px; height: 14px; vertical-align: middle; flex-shrink: 0; }
.icon-nav { width: 14px; height: 14px; vertical-align: middle; flex-shrink: 0; }
.icon-xs  { width: 12px; height: 12px; vertical-align: middle; flex-shrink: 0; }

/* ═══════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════ */

@media (max-width: 900px) {
  .sidebar { width: 240px; min-width: 240px; }
  :root { --sidebar-w: 240px; }
  .main-content { padding: 20px 24px; }
  .daily-grid { grid-template-columns: 1fr; }
  .card-morning, .card-evening, .card-study { grid-column: 1; grid-row: auto; }
  .weekly-overview { flex-direction: column; gap: 16px; text-align: center; }
  .week-days-grid { grid-template-columns: repeat(4, 1fr); }
  .history-grid { grid-template-columns: 1fr; }
  .mistake-row { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .app-layout { flex-direction: column; }
  .sidebar {
    width: 100%;
    min-width: 100%;
    max-height: 50vh;
    height: auto;
    border-right: none;
    border-bottom: 0.5px solid var(--border);
  }
  .main-content { height: auto; overflow: visible; padding: 16px; }
}