:root {
  --bg: #fafaf8;
  --card: #ffffff;
  --text: #2b2b2b;
  --text-light: #8a8a8a;
  --accent: #4a90d9;
  --accent-dark: #3777b8;
  --char-color: #c0392b;
  --border: #e8e6e1;
  --tag-bg: #f1f4f8;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.05);
  --font-cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}

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

body {
  font-family: var(--font-cn);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ---------- 头部 ---------- */
.app-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: var(--shadow);
}

.logo {
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.logo-char {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  font-size: 20px;
}

.search-bar {
  flex: 1;
  max-width: 460px;
  display: flex;
  gap: 8px;
}
.search-bar input {
  flex: 1;
  padding: 10px 14px;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s;
  font-family: var(--font-cn);
}
.search-bar input:focus { border-color: var(--accent); }
.search-bar button {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  cursor: pointer;
  transition: background 0.2s;
}
.search-bar button:hover { background: var(--accent-dark); }

/* ---------- 容器 ---------- */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

/* ---------- 状态 ---------- */
.state-box {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-light);
}
.state-box .empty-char {
  font-size: 72px;
  color: var(--char-color);
  opacity: 0.35;
  margin-bottom: 12px;
}
.hot-chars { margin-top: 20px; font-size: 14px; }
.hidden { display: none !important; }

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 14px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-icon { font-size: 36px; margin-bottom: 10px; }
#errorMessage { color: var(--text); font-size: 16px; margin-bottom: 8px; }
#errorExtra { font-size: 13px; color: var(--text-light); max-width: 520px; margin: 0 auto; }
.btn {
  margin-top: 16px;
  padding: 8px 22px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
}

/* ---------- 卡片通用 ---------- */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  margin-bottom: 16px;
}
.card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title::before {
  content: "";
  width: 4px;
  height: 16px;
  background: var(--accent);
  border-radius: 2px;
}

/* ---------- 汉字信息卡 ---------- */
.char-card { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.char-big {
  font-size: 96px;
  font-weight: 700;
  color: var(--char-color);
  line-height: 1;
  min-width: 110px;
  text-align: center;
}
.char-info { flex: 1; min-width: 240px; }
.char-pinyin {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.pinyin-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: #eef4fb;
  color: var(--accent-dark);
  border-radius: 20px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-family: var(--font-cn);
  transition: background 0.15s;
}
.pinyin-chip:hover { background: #dce9f7; }
.pinyin-chip .speaker { font-size: 13px; opacity: 0.7; }

.char-props {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px;
  font-size: 14px;
}
.prop { display: flex; gap: 6px; align-items: baseline; }
.prop .k { color: var(--text-light); }
.prop .v { font-weight: 600; }

/* ---------- 笔顺 ---------- */
.stroke-section { display: flex; flex-direction: column; gap: 14px; }
.stroke-box {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 14px;
  text-align: center;
  background: #fdfcfb;
}
.stroke-box img {
  max-width: 100%;
  max-height: 300px;
  image-rendering: auto;
}
.stroke-svg-wrap { position: relative; }
.stroke-svg-wrap svg { max-width: 100%; height: auto; }

.stroke-controls {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 10px;
}
.stroke-controls button {
  padding: 6px 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  cursor: pointer;
  font-size: 13px;
  font-family: var(--font-cn);
  transition: all 0.15s;
}
.stroke-controls button:hover { border-color: var(--accent); color: var(--accent); }
.stroke-controls button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.stroke-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  justify-content: center;
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-light);
}

details.stroke-detail {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
details.stroke-detail summary {
  padding: 10px 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  background: #fbfbfa;
  user-select: none;
}
details.stroke-detail summary:hover { background: #f4f4f2; }
details.stroke-detail[open] summary { border-bottom: 1px solid var(--border); }

/* ---------- 书写技巧 ---------- */
.writing-tip {
  background: #fffaf0;
  border-left: 4px solid #f0ad4e;
  padding: 12px 16px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
  color: #6b5436;
}

/* ---------- 释义（标签页） ---------- */
.def-tabs {
  display: flex;
  gap: 2px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 16px;
  overflow-x: auto;
  overflow-y: hidden; /* 防止标签高度略超时出现垂直滚动条 */
  scrollbar-width: thin;
}
.def-tab {
  padding: 8px 18px;
  border: none;
  background: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-family: var(--font-cn);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.def-tab:hover { color: var(--accent); }
.def-tab.active { color: var(--accent-dark); border-bottom-color: var(--accent); }
.def-tab-voice { font-size: 12px; }

.def-panel { display: none; }
.def-panel.active { display: block; }

.def-item {
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--border);
}
.def-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }

.def-text { font-size: 16px; line-height: 1.7; }
.pos-tag {
  display: inline-block;
  font-size: 12px;
  color: #fff;
  background: var(--accent);
  border-radius: 4px;
  padding: 1px 6px;
  margin-left: 6px;
  vertical-align: 2px;
}

/* 组词 / 反义 / 例句 各自成行，标签清晰 */
.def-group-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 8px;
  font-size: 14px;
}
.def-label {
  flex-shrink: 0;
  min-width: 34px;
  color: var(--text-light);
  font-size: 13px;
  padding-top: 4px;
}
.def-example-row { flex-direction: column; gap: 2px; }
.def-example-list { width: 100%; }
.example { font-style: italic; color: #666; font-size: 14px; margin-top: 2px; }
.example::before { content: "“"; }
.example::after { content: "”"; }

/* ---------- 标签 ---------- */
.tag {
  display: inline-block;
  padding: 4px 14px;
  margin: 4px;
  background: var(--tag-bg);
  border: 1px solid transparent;
  border-radius: 16px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text);
  transition: all 0.15s;
  font-family: var(--font-cn);
}
.tag:hover { border-color: var(--accent); color: var(--accent); background: #eef4fb; }
.tag.hot { background: #fff; border-color: var(--border); }
.tag-row { display: flex; flex-wrap: wrap; margin: -4px; }

/* ---------- Token 提示条 ---------- */
.token-banner {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #fff3cd;
  border: 1px solid #ffe08a;
  color: #6b5200;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 13px;
  box-shadow: var(--shadow);
  z-index: 100;
  max-width: 90vw;
  text-align: center;
}

/* ---------- 响应式 ---------- */
@media (max-width: 600px) {
  .app-header { flex-direction: column; align-items: stretch; gap: 12px; }
  .search-bar { max-width: none; }
  .char-card { flex-direction: column; text-align: center; }
  .char-big { font-size: 72px; }
  .container { padding: 16px 12px 80px; }
  .card { padding: 16px; }
}