/* ===== CSS Variables ===== */
:root {
  /* 主色系：从饱和藏青改为更克制的墨灰蓝，减少"塑料感" */
  --primary: #2c3e50;
  --primary-light: #3d5266;
  --primary-dark: #1f2d38;
  --accent: #a17f4a;
  --accent-light: #c9ad6e;
  --bg: #f9f9f8;
  --surface: #ffffff;
  --surface-hover: #f2f2f1;
  --border: #e7e5e2;
  --border-strong: #d4d1cb;
  --text: #23262b;
  --text-secondary: #565a5f;
  --text-muted: #97968f;
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  /* 阴影更浅、更贴近纸面，减少悬浮感带来的观感 */
  --shadow: 0 1px 2px rgba(20,20,18,0.04);
  --shadow-md: 0 2px 8px rgba(20,20,18,0.06);
  --shadow-lg: 0 6px 20px rgba(20,20,18,0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --transition: 0.2s ease;

  /* Subject colors */
  --math: #3d5a80;
  --math-bg: #eef1f5;
  --math-text: #2f4763;
  --eng: #4f7a68;
  --eng-bg: #eef3f0;
  --eng-text: #3d6152;
  --major: #6b5b7e;
  --major-bg: #f0edf2;
  --major-text: #564865;
  --poli: #a15353;
  --poli-bg: #f5eeee;
  --poli-text: #7d3f3f;
  --retest: #a17f4a;
  --retest-bg: #f4ede1;
  --retest-text: #7a6039;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}
#app { max-width: 960px; margin: 0 auto; padding: 0 16px 40px; }

/* ===== Header ===== */
.app-header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: white;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  padding: 18px 20px;
  margin: 0 -16px 20px;
  box-shadow: var(--shadow-md);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; max-width: 960px; margin: 0 auto; }
.header-left { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 40px; height: 40px;
  background: rgba(255,255,255,0.15);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent-light);
  flex-shrink: 0;
}
.header-title { font-size: 17px; font-weight: 700; letter-spacing: 0.02em; }
.header-sub { font-size: 12px; opacity: 0.75; margin-top: 1px; }
.header-right { text-align: right; flex-shrink: 0; }
.phase-indicator {
  font-size: 12px; font-weight: 600;
  background: rgba(255,255,255,0.15);
  padding: 3px 10px;
  border-radius: 20px;
  display: inline-block;
  backdrop-filter: blur(4px);
}
.date-display { font-size: 11px; opacity: 0.7; margin-top: 4px; }

/* ===== Tab Nav ===== */
.tab-nav {
  display: flex;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}
.tab-btn {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 6px;
  padding: 12px 8px;
  border: none; background: transparent;
  font-size: 13px; font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
  position: relative;
  white-space: nowrap;
}
.tab-btn::after {
  content: '';
  position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 0; height: 2px;
  background: var(--primary);
  transition: width var(--transition);
  border-radius: 2px;
}
.tab-btn:hover { color: var(--text-secondary); background: var(--surface-hover); }
.tab-btn.active { color: var(--primary); }
.tab-btn.active::after { width: 60%; }
.tab-label { font-size: 13px; }

/* ===== Content Panels ===== */
.tab-panel { display: none; animation: fadeIn 0.25s ease; }
.tab-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ===== Cards ===== */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 14px;
}
.card-header {
  padding: 14px 16px;
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
}
.card-header:hover { background: var(--surface-hover); }
.card-body { padding: 16px; }
.card-body.hidden { display: none; }

/* ===== Phase Bar ===== */
.phase-bar {
  display: flex; gap: 4px; height: 44px; margin-bottom: 16px;
  border-radius: var(--radius); overflow: hidden;
}
.phase-seg {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 600; cursor: pointer;
  transition: all var(--transition);
  position: relative;
}
.phase-seg:hover { filter: brightness(0.92); }
.phase-seg.active { box-shadow: inset 0 -3px 0 rgba(255,255,255,0.5); }

/* ===== Phase Cards ===== */
.phase-num {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600; flex-shrink: 0; color: white;
}
.cur-badge {
  font-size: 10px; padding: 2px 10px; border-radius: 20px;
  font-weight: 600; color: white; margin-left: auto; white-space: nowrap;
}
.section-label, .phase-body .section-label {
  font-size: 11px; font-weight: 600; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 10px;
}

/* ===== Task Rows ===== */
.task-row {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: var(--radius-sm);
  border-left: 3px solid;
  margin-bottom: 6px;
  background: var(--bg);
  transition: background var(--transition);
}
.task-row:hover { background: var(--surface-hover); }
.task-badge {
  font-size: 11px; padding: 2px 10px; border-radius: 20px;
  font-weight: 600; white-space: nowrap;
}
.task-text { font-size: 13px; color: var(--text-secondary); line-height: 1.4; }

/* ===== Info Box ===== */
.info-box {
  padding: 12px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-top: 12px; font-size: 13px; color: var(--text-secondary);
  background: var(--bg);
  line-height: 1.5;
}

/* ===== Resources Grid ===== */
.res-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.res-box {
  padding: 12px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); background: var(--bg);
}
.res-label {
  font-size: 11px; font-weight: 600; color: var(--text-muted);
  margin-bottom: 8px; display: flex; align-items: center; gap: 5px;
}
.res-item {
  font-size: 12px; color: var(--text-secondary);
  padding: 4px 0; display: flex; gap: 6px; align-items: flex-start;
  line-height: 1.45;
  border-bottom: 1px solid var(--border);
}
.res-item:last-child { border-bottom: none; }
.res-item::before { content: '·'; color: var(--text-muted); flex-shrink: 0; }

/* ===== Tracker ===== */
.date-row {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 16px;
}
.date-row input[type=date] {
  font-size: 13px; padding: 7px 12px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text);
  font-family: var(--font-sans);
}
.phase-pill {
  padding: 8px 14px; border-radius: var(--radius);
  border: 1px solid var(--border); font-size: 13px;
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 14px; background: var(--bg);
}
.prog-wrap { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; margin-bottom: 16px; }
.prog-fill { height: 100%; border-radius: 3px; transition: width 0.4s ease; }
.sub-section { margin-bottom: 14px; }
.sub-head {
  padding: 10px 14px; display: flex; align-items: center; gap: 8px;
  background: var(--bg); border-bottom: 1px solid var(--border);
}
.check-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  cursor: pointer; user-select: none; transition: background 0.12s;
}
.check-row:last-child { border-bottom: none; }
.check-row:hover { background: var(--surface-hover); }
.check-row.done { opacity: 0.55; }
.check-row.done .ck-label { text-decoration: line-through; }
.check-row input[type=checkbox] { width: 17px; height: 17px; cursor: pointer; flex-shrink: 0; }

/* ===== Notes & Save ===== */
.notes-area {
  width: 100%; border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 12px;
  font-size: 13px; resize: none; min-height: 70px;
  background: var(--surface); color: var(--text);
  font-family: var(--font-sans); line-height: 1.6;
  overflow: hidden; transition: border-color 0.15s;
}
.notes-area:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(44,62,80,0.1); }
.save-row {
  display: flex; align-items: center; gap: 14px;
  margin-top: 16px; flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 22px; border: none; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 600; cursor: pointer;
  font-family: var(--font-sans);
  transition: all var(--transition);
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-light); box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--bg); color: var(--text-secondary); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--surface-hover); }
.btn-sm { padding: 6px 14px; font-size: 12px; }
.save-status { font-size: 13px; font-weight: 500; }

/* ===== Lightbox ===== */
#lightbox-overlay {
  display: none; position: fixed; z-index: 9999;
  left: 0; top: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.85);
  align-items: center; justify-content: center;
  cursor: zoom-out;
}
#lightbox-overlay img {
  max-width: 92vw; max-height: 90vh;
  border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
  object-fit: contain;
}
.lightbox-close {
  position: fixed; top: 16px; right: 20px;
  font-size: 28px; color: white; cursor: pointer;
  width: 40px; height: 40px; display: flex;
  align-items: center; justify-content: center;
  background: rgba(0,0,0,0.4); border-radius: 50%;
  z-index: 10000; line-height: 1;
}
.lightbox-close:hover { background: rgba(0,0,0,0.7); }

/* ===== Photo toolbar ===== */
.photo-toolbar {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 10px;
}

/* ===== Upload ===== */
.upload-area {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 20px; text-align: center;
  cursor: pointer; transition: all var(--transition);
  margin-bottom: 10px;
}
.upload-area:hover { border-color: var(--primary); background: rgba(44,62,80,0.03); }
.upload-area.dragover { border-color: var(--primary); background: rgba(44,62,80,0.06); }
.upload-icon { font-size: 28px; color: var(--text-muted); margin-bottom: 6px; }
.upload-text { font-size: 13px; color: var(--text-muted); }
.photo-list { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.photo-item {
  width: 72px; height: 72px; border-radius: var(--radius-sm);
  overflow: hidden; border: 1px solid var(--border);
  position: relative; cursor: pointer;
}
.photo-item img { width: 100%; height: 100%; object-fit: cover; }
.photo-del {
  position: absolute; top: 2px; right: 2px;
  width: 20px; height: 20px; border-radius: 50%;
  background: rgba(220,38,38,0.85); color: white;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; cursor: pointer;
  border: none; opacity: 0.85; transition: opacity var(--transition);
  line-height: 1; z-index: 2;
}
.photo-del:hover { opacity: 1; background: #a15353; }
.photo-item:hover .photo-del { opacity: 1; }

/* ===== Daily Section ===== */
.quote-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  border-radius: var(--radius-lg);
  padding: 20px; margin-bottom: 16px;
  position: relative; overflow: hidden;
}
.quote-card::before {
  content: '"';
  position: absolute; top: -10px; left: 10px;
  font-size: 80px; opacity: 0.12;
  font-family: Georgia, serif;
}
.quote-text { font-size: 16px; font-weight: 500; line-height: 1.6; position: relative; z-index: 1; }
.quote-source { font-size: 12px; opacity: 0.7; margin-top: 8px; position: relative; z-index: 1; }
.quote-source::before { content: '— '; }

/* ===== Word Cards ===== */
.word-list { display: grid; gap: 8px; }
.word-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: pointer; transition: all var(--transition);
}
.word-item:hover { border-color: var(--primary-light); background: var(--surface-hover); }
.word-item.review { border-left: 3px solid var(--accent); }
.word-en {
  font-size: 14px; font-weight: 600; color: var(--primary);
  min-width: 120px; font-family: var(--font-mono);
}
.word-cn { font-size: 13px; color: var(--text-secondary); }
.word-subject {
  margin-left: auto; font-size: 10px; padding: 1px 8px;
  border-radius: 10px; font-weight: 500;
  background: var(--border); color: var(--text-muted);
  white-space: nowrap;
}
/* ===== Word Flip Animation ===== */
.word-item {
  -webkit-perspective: 800px;
  perspective: 800px;
  cursor: pointer;
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: border-color var(--transition), box-shadow var(--transition);
  position: relative;
}
.word-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
.word-flip {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
  flex-wrap: wrap;
  transition: -webkit-transform 0.4s ease;
  transition: transform 0.4s ease;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}
.word-item.flipped .word-flip { -webkit-transform: rotateX(180deg); transform: rotateX(180deg); }
.word-face {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.word-face-front { }
.word-face-back {
  position: absolute;
  top: 0; left: 0; right: 0;
  -webkit-transform: rotateX(180deg);
  transform: rotateX(180deg);
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.word-main { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; flex-wrap: wrap; }
.word-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.word-star { cursor: pointer; font-size: 18px; transition: transform 0.2s; }
.word-star:hover { transform: scale(1.3); }
.word-star:active { transform: scale(0.9); }
.stat-number { font-size: 22px; font-weight: 700; color: var(--primary); line-height: 1.2; }

/* ===== Review word hover tooltip ===== */
.review-word {
  position: relative;
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: default;
  transition: all 0.15s;
}
.review-word:hover {
  border-color: var(--accent);
  background: #f8f5ee;
  color: #6b552f;
}
.review-word .review-tip {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--text);
  color: white;
  font-size: 12px;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  transition: all 0.2s;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.review-word .review-tip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--text);
}
.review-word:hover .review-tip {
  visibility: visible;
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Phase Tips minimal redesign ===== */
.tips-section {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.tips-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 12px;
  align-items: start;
}
.tips-item:last-child { border-bottom: none; }
.tips-phase {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  padding: 3px 10px;
  border-radius: 4px;
  text-align: center;
  line-height: 1.4;
}
.tips-content {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}
@media (max-width: 599px) {
  .tips-item { grid-template-columns: 1fr; gap: 4px; }
  .tips-phase { text-align: left; display: inline-block; }
}

/* ===== App Recommendations ===== */
.app-groups { display: flex; flex-direction: column; gap: 10px; }
.app-group {
  border-radius: var(--radius); padding: 12px 14px;
  background: var(--bg); transition: box-shadow var(--transition);
}
.app-group:hover { box-shadow: var(--shadow); }
.app-group-hd {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 10px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 11px;
}
.app-g-item {
  display: flex; flex-direction: column; gap: 2px;
  padding: 7px 0; margin-left: 4px;
  border-bottom: 1px solid var(--border-light);
}
.app-g-item:last-child { border-bottom: none; }
.app-g-name { font-size: 12.5px; font-weight: 600; color: var(--text); }
.app-g-desc { font-size: 11.5px; color: var(--text-secondary); line-height: 1.45; }

/* ===== Progress ===== */
.stats-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px; margin-bottom: 16px;
}
.stat-card {
  text-align: center; padding: 14px 10px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius);
}
.stat-num { font-size: 22px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: white;
  padding: 10px 20px; border-radius: var(--radius);
  font-size: 13px; font-weight: 500;
  opacity: 0; transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none; z-index: 999;
  box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); pointer-events: auto; }

/* ===== Study Plan Tips ===== */
.plan-tip {
  background: linear-gradient(135deg, #f8f5ee, #f4ede1);
  border: 1px solid #d8c69a;
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 14px;
}
.plan-tip-title { font-size: 13px; font-weight: 600; color: #6b552f; margin-bottom: 4px; }
.plan-tip-text { font-size: 12px; color: #a16207; line-height: 1.5; }

/* ===== Syllabus ===== */
.chap-row {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 9px 10px; border-radius: var(--radius-sm);
  background: var(--bg); margin-bottom: 6px;
  border: 1px solid var(--border);
}
.chap-row input { margin-top: 2px; flex-shrink: 0; cursor: pointer; }
.chap-title { font-size: 13px; font-weight: 500; color: var(--text); }
.chap-sub { font-size: 11.5px; color: var(--text-muted); margin-top: 3px; line-height: 1.5; }

/* ===== History ===== */
.history-list { display: flex; flex-direction: column; gap: 6px; }
.history-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); font-size: 12px;
}
.history-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.history-date { font-weight: 600; color: var(--text-secondary); min-width: 70px; }
.history-note { color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Progress Ring (SVG环形进度) ===== */
.progress-ring {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.progress-ring svg {
  width: 64px;
  height: 64px;
  transform: rotate(-90deg);
}
.progress-ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 4;
}
.progress-ring-fg {
  fill: none;
  stroke-width: 4;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.6s ease;
}
.progress-ring-text {
  position: absolute;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
}

/* ===== Save Indicator (自动保存指示器) ===== */
.save-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  padding: 2px 0;
  transition: opacity 0.3s;
}
.save-indicator.idle { color: var(--text-muted); }
.save-indicator.saving { color: var(--text-muted); }
.save-indicator.saved { color: #4f7a68; }
.save-indicator.error { color: #a15353; }
.save-indicator .spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--text-muted);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Note auto-save hint ===== */
.notes-area.saving {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(161,127,74,0.1);
}

/* ===== Enhanced Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.tab-panel.active {
  animation: fadeInUp 0.25s ease;
}

/* ===== Enhanced Card Style ===== */
.card {
  transition: box-shadow 0.2s, transform 0.15s;
}
.card:hover {
  box-shadow: var(--shadow-md);
}

/* ===== Check-row enhancements ===== */
.check-row {
  transition: background 0.12s, opacity 0.2s;
}
.check-row input[type=checkbox] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  flex-shrink: 0;
  border-radius: 4px;
  transition: transform 0.15s;
}
.check-row input[type=checkbox]:active {
  transform: scale(0.85);
}
.check-row.done {
  opacity: 0.55;
}
.check-row.done .ck-label {
  text-decoration: line-through;
}

/* ===== Photo item hover enhancement ===== */
.photo-item {
  transition: transform 0.2s, box-shadow 0.2s;
}
.photo-item:hover {
  transform: scale(1.03);
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
.photo-del {
  transition: opacity 0.15s, transform 0.15s;
}
.photo-del:hover {
  transform: scale(1.15);
}

/* ===== History list enhancement ===== */
.history-item {
  transition: background 0.15s;
}
.history-item:hover {
  background: var(--surface-hover);
}

/* ===== Date input enhancement ===== */
.date-row input[type=date] {
  transition: border-color 0.2s, box-shadow 0.2s;
}
.date-row input[type=date]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(44,62,80,0.1);
}

/* ===== Save row subtle enhancement ===== */
.save-row .btn-primary {
  box-shadow: 0 2px 6px rgba(44,62,80,0.15);
}
.save-row .btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(44,62,80,0.2);
}
.save-row .btn-primary:active {
  transform: translateY(0);
}

/* ===== Tracker — 简约高级版 ===== */

.tracker-view { display: flex; flex-direction: column; gap: 12px; }

.tk-head {
  background: var(--surface);
  border-radius: 12px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.tk-head-row { display: flex; align-items: center; justify-content: space-between; }
.tk-date-group { display: flex; align-items: center; gap: 8px; color: var(--text-muted); }
.tk-date-group input[type=date] {
  font-size: 14px; font-weight: 500; padding: 2px 8px; border: none;
  background: transparent; color: var(--text); font-family: var(--font-sans); outline: none;
}
.tk-date-group input[type=date]:focus { color: var(--primary); }

.tk-meta {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--border);
}
.tk-phase-tag { font-size: 13px; font-weight: 500; display: flex; align-items: center; gap: 6px; }
.tk-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.tk-count { font-size: 13px; font-weight: 600; color: var(--text-secondary); }

/* Progress */
.tk-progress {
  display: flex; align-items: center; gap: 18px;
  background: var(--surface); border-radius: 12px;
  padding: 18px 20px; border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.tk-ring-wrap { flex-shrink: 0; }
.tk-progress-body { flex: 1; min-width: 0; }
.tk-progress-title { font-size: 15px; font-weight: 600; color: var(--text); }
.tk-progress-desc { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.tk-bar { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; margin-top: 10px; }
.tk-bar-fill { height: 100%; border-radius: 2px; transition: width 0.5s ease; }

/* Task sections */
.tk-section {
  background: var(--surface); border-radius: 12px;
  border: 1px solid var(--border); overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.tk-section-hd {
  display: flex; align-items: center; gap: 8px;
  padding: 13px 18px; border-left: 3px solid transparent;
  border-bottom: 1px solid var(--border);
}
.tk-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 18px; border-bottom: 1px solid var(--border);
  cursor: pointer; transition: background 0.15s; user-select: none;
}
.tk-row:last-child { border-bottom: none; }
.tk-row:hover { background: var(--surface-hover); }
.tk-row.done { opacity: 0.5; }
.tk-row.done .tk-row-label { text-decoration: line-through; color: var(--text-muted); }
.tk-row input[type=checkbox] { width: 18px; height: 18px; cursor: pointer; flex-shrink: 0; border-radius: 4px; }
.tk-row-label { flex: 1; font-size: 13px; color: var(--text); line-height: 1.4; }

/* Photo */
.tk-photo { padding: 14px 18px; }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--text-secondary); font-size: 12px;
  font-weight: 500; cursor: pointer; font-family: var(--font-sans); transition: all 0.2s;
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); background: rgba(44,62,80,0.03); }
.photo-grid { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.photo-item {
  width: 72px; height: 72px; border-radius: 8px; overflow: hidden;
  border: 1px solid var(--border); position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
}
.photo-item:hover { transform: scale(1.04); box-shadow: 0 3px 10px rgba(0,0,0,0.08); }
.photo-item img { width: 100%; height: 100%; object-fit: cover; cursor: pointer; }
.photo-item.photo-broken { display: flex; align-items: center; justify-content: center; background: var(--bg); }
.photo-item.photo-broken img { display: none; }
.photo-item.photo-broken::after { content: '加载失败'; font-size: 10px; color: var(--text-muted); }
.photo-del {
  position: absolute; top: 3px; right: 3px; width: 20px; height: 20px; border-radius: 50%;
  background: rgba(220,38,38,0.85); color: white; border: none; font-size: 11px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.2s; z-index: 2;
}
.photo-item:hover .photo-del { opacity: 1; }

/* Notes */
.tk-note-wrap { padding: 14px 18px; }
.tk-note {
  width: 100%; border: 1px solid var(--border); border-radius: 8px;
  padding: 11px 14px; font-size: 13px; font-family: var(--font-sans);
  line-height: 1.7; resize: none; min-height: 80px;
  background: var(--surface); color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s; overflow: hidden;
}
.tk-note:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(44,62,80,0.08); }
.tk-note::placeholder { color: var(--text-muted); }

/* Actions */
.tk-actions { display: flex; align-items: center; gap: 12px; padding: 2px 0; }
.tk-badge { font-size: 13px; font-weight: 600; color: #a17f4a; display: flex; align-items: center; gap: 5px; }

/* History */
.tk-history { padding: 14px 18px; display: flex; flex-direction: column; gap: 6px; }
.tk-h-item {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px;
  border-radius: 8px; border: 1px solid var(--border); font-size: 12px;
  transition: background 0.15s;
}
.tk-h-item:hover { background: var(--surface-hover); }
.tk-h-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.tk-h-date { font-weight: 600; color: var(--text-secondary); min-width: 75px; }
.tk-h-note { color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Ring classes for new render */
.ring-bg { fill: none; stroke: var(--border); stroke-width: 4; }
.ring-fg { fill: none; stroke-width: 4; stroke-linecap: round; transition: stroke-dashoffset 0.6s ease; }
.ring-label { position: absolute; font-size: 14px; font-weight: 700; line-height: 1; }