/* 小红书风格知识笔记 —— 样式 */
:root {
  --red: #ff2442;
  --red-dark: #e01e3c;
  --bg: #f5f5f5;
  --card-bg: #ffffff;
  --text: #1f1f1f;
  --text-2: #666666;
  --text-3: #999999;
  --border: #ebebeb;
  --safe-top: env(safe-area-inset-top, 0px);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ---------- 顶部导航 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  padding: calc(var(--safe-top) + 10px) 16px 10px;
  display: flex;
  align-items: center;
}

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

.brand-logo {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, #ff5c72, var(--red));
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.vault-tabs {
  display: flex;
  gap: 8px;
  padding: 4px 16px 10px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.vault-tabs::-webkit-scrollbar {
  display: none;
}

.vault-tab {
  flex: 0 0 auto;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 14px;
  color: var(--text-2);
  background: #f2f2f2;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.vault-tab.active {
  background: var(--red);
  color: #fff;
  font-weight: 600;
}

.vault-tab .count {
  font-size: 11px;
  opacity: 0.7;
  margin-left: 3px;
}

/* ---------- 瀑布流 ---------- */
.feed {
  columns: 2;
  column-gap: 10px;
  padding: 12px 10px calc(env(safe-area-inset-bottom, 0px) + 40px);
}

.card {
  break-inside: avoid;
  margin-bottom: 12px;
  background: var(--card-bg);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  cursor: pointer;
  transition: transform 0.12s ease;
}

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

/* 文字封面区（渐变 + 标题大字） */
.cover {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 14px;
  color: #fff;
  text-align: center;
}

.cover .cover-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
}

/* 封面高度档位（制造错落感） */
.cover.s { min-height: 90px; }
.cover.m { min-height: 130px; }
.cover.l { min-height: 170px; }

.card-body {
  padding: 12px 12px 10px;
}

.card .title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card .excerpt {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card .tags {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.card .tag {
  font-size: 11px;
  color: #8a8a8a;
  background: #f5f5f5;
  padding: 2px 8px;
  border-radius: 10px;
}

.card .meta {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 6px;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex: 0 0 auto;
}

/* ---------- 加载 / 空状态 ---------- */
.loading, .empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 0;
  color: var(--text-3);
  gap: 12px;
}

.loading[hidden], .empty[hidden] {
  display: none;
}

.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid #e0e0e0;
  border-top-color: var(--red);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- 详情弹层 ---------- */
.overlay {
  position: fixed;
  inset: 0;
  background: #fff;
  z-index: 200;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  animation: slideIn 0.2s ease;
}

.overlay[hidden] {
  display: none;
}

@keyframes slideIn {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

.detail-head {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: calc(var(--safe-top) + 8px) 12px 8px;
}

.back-btn {
  width: 34px;
  height: 34px;
  border: none;
  background: #f2f2f2;
  border-radius: 50%;
  font-size: 22px;
  line-height: 1;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.detail-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.detail-vault {
  font-size: 14px;
  font-weight: 600;
}

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

.detail-cover {
  padding: 24px 20px;
  color: #fff;
  text-align: center;
}

.detail-body {
  padding: 20px 18px 60px;
}

.detail-title {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.detail-tags .tag {
  font-size: 12px;
  color: var(--red);
  background: #fff0f2;
  padding: 4px 12px;
  border-radius: 12px;
}

/* markdown 正文渲染 */
.markdown-body {
  font-size: 16px;
  line-height: 1.75;
  color: #333;
  word-wrap: break-word;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  margin: 1.2em 0 0.6em;
  font-weight: 700;
  line-height: 1.4;
}

.markdown-body h1 { font-size: 20px; }
.markdown-body h2 { font-size: 18px; padding-left: 8px; border-left: 4px solid var(--red); }
.markdown-body h3 { font-size: 16px; }
.markdown-body h4 { font-size: 15px; }

.markdown-body p { margin: 0.6em 0; }

.markdown-body ul, .markdown-body ol {
  margin: 0.6em 0;
  padding-left: 1.4em;
}

.markdown-body li { margin: 0.3em 0; }

.markdown-body blockquote {
  margin: 0.8em 0;
  padding: 8px 14px;
  background: #f8f8f8;
  border-left: 4px solid #ddd;
  color: #666;
  border-radius: 4px;
}

.markdown-body code {
  background: #f5f5f5;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

.markdown-body pre {
  background: #f5f5f5;
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0.8em 0;
}

.markdown-body pre code {
  background: none;
  padding: 0;
}

.markdown-body table {
  border-collapse: collapse;
  margin: 0.8em 0;
  width: 100%;
}

.markdown-body th, .markdown-body td {
  border: 1px solid #e0e0e0;
  padding: 6px 10px;
  font-size: 14px;
}

.markdown-body th {
  background: #f8f8f8;
  font-weight: 600;
}

.markdown-body a {
  color: var(--red);
  text-decoration: none;
}

.markdown-body img {
  max-width: 100%;
  border-radius: 8px;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1em 0;
}