:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --panel-2: #f0f3f8;
  --border: #e3e8ef;
  --text: #1f2733;
  --text-soft: #66728a;
  --primary: #3b82f6;
  --primary-soft: #e8f0fe;
  --accent: #6366f1;
  --danger: #ef4444;
  --success: #16a34a;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }

#app { display: flex; height: 100vh; overflow: hidden; }

/* ---------- 侧边栏 ---------- */
.sidebar {
  width: 264px;
  flex: 0 0 264px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform .25s ease;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  padding: 18px 18px 14px;
  font-weight: 700; font-size: 17px;
}
.brand-logo { font-size: 22px; }
.brand-name { flex: 1; }
.sidebar-close { display: none; border: none; background: none; font-size: 16px; color: var(--text-soft); cursor: pointer; }

.search-box { padding: 0 14px 12px; }
.search-box input {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border);
  border-radius: 9px; background: var(--panel-2); color: var(--text);
  font-size: 13px; outline: none;
}
.search-box input:focus { border-color: var(--primary); background: #fff; }

.tool-nav { flex: 1; overflow-y: auto; padding: 4px 10px 12px; }
.nav-group-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-soft); padding: 14px 10px 6px; font-weight: 700;
}
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 9px; cursor: pointer;
  color: var(--text); user-select: none; margin-bottom: 2px;
}
.nav-item:hover { background: var(--panel-2); }
.nav-item.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.nav-item .emoji { font-size: 16px; width: 20px; text-align: center; }
.nav-item .label { flex: 1; }
.nav-empty { padding: 20px 14px; color: var(--text-soft); text-align: center; }

.sidebar-foot { padding: 12px 16px; font-size: 11px; color: var(--text-soft); border-top: 1px solid var(--border); }

/* ---------- 主区域 ---------- */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  height: 56px; flex: 0 0 56px; display: flex; align-items: center; gap: 12px;
  padding: 0 18px; background: var(--panel); border-bottom: 1px solid var(--border);
}
.menu-btn { display: none; border: none; background: none; font-size: 20px; cursor: pointer; color: var(--text); }
.topbar-title { font-weight: 600; font-size: 15px; flex: 1; }
.topbar-link { font-size: 12px; color: var(--text-soft); }

.content { flex: 1; overflow-y: auto; padding: 22px; }

/* ---------- 首页 ---------- */
.home-hero { margin-bottom: 20px; }
.home-hero h1 { margin: 0 0 6px; font-size: 22px; }
.home-hero p { margin: 0; color: var(--text-soft); }
.cards {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; cursor: pointer; box-shadow: var(--shadow); transition: .15s;
}
.card:hover { transform: translateY(-2px); border-color: var(--primary); }
.card .c-emoji { font-size: 26px; }
.card .c-name { font-weight: 600; margin: 8px 0 4px; }
.card .c-desc { color: var(--text-soft); font-size: 12.5px; }

/* ---------- 工具视图 ---------- */
.tool-view { max-width: 920px; margin: 0 auto; }
.tool-head { margin-bottom: 16px; }
.tool-head h2 { margin: 0 0 4px; font-size: 19px; }
.tool-head p { margin: 0; color: var(--text-soft); font-size: 13px; }

.tool-desc {
  background: var(--primary-soft); color: #1e40af; border-radius: 9px;
  padding: 10px 13px; font-size: 12.5px; margin-bottom: 16px;
}

.field { margin-bottom: 14px; }
.field > label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 13px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row.tight { gap: 6px; }

textarea, input[type="text"], input[type="number"], select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 9px; background: var(--panel); color: var(--text);
  font-size: 13px; outline: none; font-family: var(--mono);
}
textarea { resize: vertical; min-height: 130px; line-height: 1.55; }
textarea:focus, input:focus, select:focus { border-color: var(--primary); }

input[type="text"], input[type="number"], select { font-family: inherit; }
select { font-family: inherit; }

.btn {
  border: 1px solid var(--border); background: var(--panel); color: var(--text);
  padding: 8px 14px; border-radius: 9px; cursor: pointer; font-size: 13px; font-weight: 600;
  transition: .15s; white-space: nowrap;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { background: #2f74e6; color: #fff; }
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 10px; font-size: 12px; }

.out {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 9px;
  padding: 12px; min-height: 60px; white-space: pre-wrap; word-break: break-all;
  font-family: var(--mono); font-size: 13px; overflow-x: auto;
}
.out.error { background: #fef2f2; color: var(--danger); border-color: #fecaca; }
.out.ok { background: #f0fdf4; color: var(--success); border-color: #bbf7d0; }

.hint { font-size: 12px; color: var(--text-soft); margin-top: 6px; }
.copy-wrap { position: relative; }
.copy-btn {
  position: absolute; top: 8px; right: 8px; z-index: 2;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 720px) { .grid-2 { grid-template-columns: 1fr; } }

/* 颜色 */
.color-preview { width: 100%; height: 90px; border-radius: 10px; border: 1px solid var(--border); margin-bottom: 10px; }
.swatch-row { display: flex; gap: 10px; flex-wrap: wrap; }
.swatch { width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border); cursor: pointer; }

/* 二维码 */
.qr-box { display: flex; justify-content: center; padding: 14px; background: #fff; border-radius: 10px; border: 1px solid var(--border); }
.qr-box svg { max-width: 240px; height: auto; }

/* 文本统计 */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 12px; }
.stat { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.stat .v { font-size: 22px; font-weight: 700; }
.stat .k { font-size: 12px; color: var(--text-soft); }

/* 强度条 */
.strength { height: 8px; border-radius: 6px; background: var(--panel-2); overflow: hidden; margin-top: 8px; }
.strength > i { display: block; height: 100%; width: 0; transition: .2s; }

/* 正则高亮 */
.regex-matches { font-family: var(--mono); font-size: 13px; line-height: 1.7; }
.regex-matches mark { background: #fde68a; color: #7c2d12; padding: 0 2px; border-radius: 3px; }

/* 密码列表 */
.pw-list { font-family: var(--mono); font-size: 13px; }
.pw-list div { padding: 4px 0; border-bottom: 1px dashed var(--border); display: flex; justify-content: space-between; gap: 10px; }
.pw-list .cp { cursor: pointer; color: var(--primary); }

/* 滑动条 */
input[type="range"] { width: 100%; accent-color: var(--primary); }

.tag { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 20px; background: var(--panel-2); color: var(--text-soft); margin-left: 6px; }

.markdown-body { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 18px 22px; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { margin-top: 1em; }
.markdown-body code { background: var(--panel-2); padding: 2px 5px; border-radius: 5px; font-family: var(--mono); font-size: 12.5px; }
.markdown-body pre { background: #0f172a; color: #e2e8f0; padding: 12px 14px; border-radius: 9px; overflow-x: auto; }
.markdown-body pre code { background: none; color: inherit; padding: 0; }
.markdown-body blockquote { border-left: 3px solid var(--primary); margin: 0; padding: 4px 14px; color: var(--text-soft); background: var(--panel-2); border-radius: 0 8px 8px 0; }
.markdown-body table { border-collapse: collapse; width: 100%; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 6px 10px; }

/* ---------- 图片工具 ---------- */
.img-drop {
  border: 2px dashed var(--border); border-radius: 12px; padding: 30px 16px; text-align: center;
  color: var(--text-soft); cursor: pointer; transition: .15s; background: var(--panel); line-height: 1.8;
}
.img-drop:hover, .img-drop.dragover { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }
.img-drop .hint { font-size: 12px; }
label.mini { display: block; font-weight: 600; margin-bottom: 6px; font-size: 12.5px; color: var(--text-soft); }
.img-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 720px) { .img-compare { grid-template-columns: 1fr; } }
.img-card { border: 1px solid var(--border); border-radius: 10px; padding: 10px; background: #fff; }
.img-card-t { font-size: 12px; font-weight: 700; color: var(--text-soft); margin-bottom: 8px; }
.img-card img { max-width: 100%; max-height: 320px; border-radius: 6px; display: block; margin: 0 auto; }
.img-card-m { font-size: 12px; color: var(--text-soft); margin-top: 8px; text-align: center; }
.img-summary { margin-top: 12px; font-size: 13px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 9px; padding: 10px 12px; }

/* 遮罩（移动端） */
.overlay { display: none; position: fixed; inset: 0; background: rgba(15,23,42,.4); z-index: 40; }

@media (max-width: 860px) {
  .sidebar { position: fixed; z-index: 50; top: 0; bottom: 0; left: 0; transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-close { display: block; }
  .menu-btn { display: block; }
  .overlay.show { display: block; }
}