/* ===== 考研助手 PWA 样式 ===== */

/* ----- 基础重置与变量 ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-primary: #1a73e8;
  --color-bg: #f0f2f5;
  --color-card: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #666;
  --color-border: #e0e0e0;
  --color-math: #e74c3c;
  --color-english: #3498db;
  --color-politics: #e67e22;
  --color-major: #2ecc71;
  --color-unstarted: #bdc3c7;
  --color-beginning: #e74c3c;
  --color-progress: #f39c12;
  --color-mastered: #27ae60;
  --color-expert: #2980b9;
  --nav-height: 64px;
  --header-height: 56px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

html { font-size: 16px; }

body {
  font-family: var(--font-stack);
  background: var(--color-bg);
  color: var(--color-text);
  max-width: 430px;
  margin: 0 auto;
  min-height: 100dvh;
  position: relative;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ----- 顶部标题栏 ----- */
#app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

#header-title { font-size: 1.1rem; font-weight: 600; }
#header-date { font-size: 0.8rem; opacity: 0.85; }

/* ----- 主内容区 ----- */
#app-content {
  padding: 16px 16px calc(var(--nav-height) + var(--safe-bottom) + 20px);
}

.view { display: none; }
.view.active { display: block; }

.section-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--color-text);
}

/* ----- 卡片 ----- */
.card {
  background: var(--color-card);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

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

.card-title { font-weight: 600; font-size: 0.95rem; }

/* ----- 底部导航 ----- */
#bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: calc(var(--nav-height) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: #fff;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: 100;
}

.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 4px;
  color: #999;
  transition: color 0.15s;
  position: relative;
  font-family: var(--font-stack);
}

.nav-btn.active { color: var(--color-primary); }

.nav-icon { font-size: 1.35rem; line-height: 1; }
.nav-label { font-size: 0.65rem; margin-top: 2px; }

.badge {
  position: absolute;
  top: 4px;
  right: calc(50% - 22px);
  background: #e74c3c;
  color: #fff;
  font-size: 0.6rem;
  min-width: 18px;
  height: 18px;
  line-height: 18px;
  text-align: center;
  border-radius: 9px;
  padding: 0 5px;
}

.hidden { display: none !important; }

/* ----- 进度环 ----- */
.progress-ring-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 0;
}

.progress-ring {
  width: 70px;
  height: 70px;
  flex-shrink: 0;
}

.progress-ring-circle {
  fill: none;
  stroke: #e0e0e0;
  stroke-width: 6;
}

.progress-ring-fill {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 6;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: center;
  transition: stroke-dashoffset 0.5s;
}

.progress-ring-text {
  font-size: 0.85rem;
  font-weight: 700;
  fill: var(--color-primary);
  text-anchor: middle;
  dominant-baseline: central;
}

.progress-detail { font-size: 0.85rem; color: var(--color-text-secondary); }
.progress-detail span { color: var(--color-text); font-weight: 600; }

/* ----- 任务列表 ----- */
.task-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid #f0f0f0;
}

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

.task-checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid #ccc;
  border-radius: 50%;
  flex-shrink: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  background: none;
}

.task-checkbox.done {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.task-checkbox.done::after {
  content: '✓';
  color: #fff;
  font-size: 0.75rem;
}

.task-info { flex: 1; min-width: 0; }
.task-name { font-size: 0.9rem; }
.task-meta { font-size: 0.75rem; color: var(--color-text-secondary); }

.task-subject-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ----- 知识图谱 ----- */
.subject-card {
  background: var(--color-card);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.subject-card-header {
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.subject-card-header:active { background: #f8f8f8; }

.subject-info { display: flex; align-items: center; gap: 10px; }
.subject-icon { font-size: 1.4rem; }
.subject-name { font-weight: 600; font-size: 0.95rem; }
.subject-progress { font-size: 0.78rem; color: var(--color-text-secondary); }

.subject-card-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s;
}

.subject-card-body.open { max-height: 1000px; }

.chapter-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-top: 1px solid #f5f5f5;
  font-size: 0.85rem;
}

.chapter-status { font-size: 1rem; flex-shrink: 0; }
.chapter-name { flex: 1; }
.chapter-mastery {
  display: flex;
  gap: 3px;
  flex-shrink: 0;
}

.mastery-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #e0e0e0;
}

.mastery-dot.filled { background: var(--color-mastered); }

.chapter-next-review {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  min-width: 55px;
  text-align: right;
}

/* ----- 上传区 ----- */
.upload-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.upload-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px;
  background: var(--color-card);
  border: 2px dashed var(--color-border);
  border-radius: 12px;
  cursor: pointer;
  font-family: var(--font-stack);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all 0.15s;
}

.upload-btn:active { border-color: var(--color-primary); background: #f0f5ff; }

.upload-btn-icon { font-size: 2rem; }

.image-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.gallery-item {
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  cursor: pointer;
  background: #f0f0f0;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gallery-item-date {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 0.65rem;
  padding: 3px 6px;
  text-align: center;
}

.gallery-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--color-text-secondary);
  padding: 32px 0;
  font-size: 0.85rem;
}

/* 生成提示词 */
.prompt-box {
  background: var(--color-card);
  border-radius: 12px;
  padding: 16px;
  margin-top: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.prompt-text {
  background: #f5f5f5;
  border-radius: 8px;
  padding: 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 200px;
  overflow-y: auto;
  margin: 10px 0;
  color: var(--color-text-secondary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font-stack);
  transition: opacity 0.15s;
}

.btn:active { opacity: 0.8; }

.btn-primary { background: var(--color-primary); color: #fff; }
.btn-secondary { background: #e8e8e8; color: var(--color-text); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-block { width: 100%; }

/* 手动打卡表单 */
.manual-log-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.manual-log-form select,
.manual-log-form input,
.manual-log-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: var(--font-stack);
  background: #fff;
}

.manual-log-form textarea {
  height: 80px;
  resize: vertical;
}

/* ----- 复习页 ----- */
.review-list { list-style: none; }

.review-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
}

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

.review-date {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  min-width: 58px;
}

.review-subject-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.review-chapter { flex: 1; font-size: 0.88rem; }

.review-interval {
  font-size: 0.72rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.review-stage-tag {
  font-size: 0.65rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: #e8f0fe;
  color: var(--color-primary);
  flex-shrink: 0;
}

.review-action {
  flex-shrink: 0;
}

.stats-row {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.stat-card {
  flex: 1;
  background: var(--color-card);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label { font-size: 0.72rem; color: var(--color-text-secondary); margin-top: 4px; }

/* ----- Toast ----- */
.toast {
  position: fixed;
  bottom: calc(var(--nav-height) + var(--safe-bottom) + 20px);
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: #fff;
  padding: 10px 24px;
  border-radius: 20px;
  font-size: 0.85rem;
  z-index: 200;
  transition: opacity 0.3s, transform 0.3s;
  max-width: 90%;
  white-space: nowrap;
}

.toast.hidden { opacity: 0; transform: translateX(-50%) translateY(20px); pointer-events: none; }

/* ----- 弹窗 ----- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal.hidden { display: none; }

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.7);
}

.modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 80vh;
}

.modal-content img {
  max-width: 90vw;
  max-height: 80vh;
  border-radius: 8px;
  object-fit: contain;
}

.modal-close {
  position: absolute;
  top: -36px;
  right: 0;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
  line-height: 1;
}

/* ----- 设置区 ----- */
.settings-section {
  margin-top: 16px;
}

.settings-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
}

.settings-label { font-size: 0.9rem; }
.settings-value { font-size: 0.85rem; color: var(--color-text-secondary); }

/* ----- 空状态 ----- */
.empty-state {
  text-align: center;
  padding: 32px 16px;
  color: var(--color-text-secondary);
}

.empty-state-icon { font-size: 3rem; margin-bottom: 10px; }
.empty-state-text { font-size: 0.9rem; }

/* ----- 弱项提示 ----- */
.weak-alert {
  background: #fff3e0;
  border-left: 3px solid #e67e22;
  border-radius: 8px;
  padding: 12px 14px;
  margin-top: 8px;
  font-size: 0.85rem;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.weak-alert-icon { flex-shrink: 0; }

/* ----- 分析结果导入 ----- */
.import-area {
  margin-top: 16px;
}

.import-area textarea {
  width: 100%;
  height: 120px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.8rem;
  font-family: var(--font-stack);
  resize: vertical;
}

/* ----- 进度条 ----- */
.progress-bar {
  height: 6px;
  background: #e0e0e0;
  border-radius: 3px;
  overflow: hidden;
  margin-top: 6px;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s;
}