/* ===== 主题变量 ===== */
:root {
  --bg: #f5f7fa; --bg-soft: #ffffff; --bg-elev: #ffffff;
  --text: #1f2933; --muted: #6b7280; --border: #e5e7eb;
  --primary: #4f46e5; --primary-soft: #eef2ff; --accent: #06b6d4;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-h: 0 8px 24px rgba(79,70,229,.18);
  --radius: 14px; --radius-s: 9px;
  --ok: #16a34a; --warn: #d97706; --err: #dc2626;
}
[data-theme="dark"] {
  --bg: #0f1419; --bg-soft: #1a212b; --bg-elev: #222b36;
  --text: #e6edf3; --muted: #93a1b0; --border: #2d3744;
  --primary: #818cf8; --primary-soft: #2a2f4a; --accent: #22d3ee;
  --shadow: 0 1px 3px rgba(0,0,0,.4); --shadow-h: 0 8px 24px rgba(129,140,248,.25);
  --ok: #4ade80; --warn: #fbbf24; --err: #f87171;
}
* { box-sizing: border-box; }
html,body { margin:0; padding:0; }
body {
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background: var(--bg); color: var(--text); line-height:1.6;
  transition: background .25s, color .25s;
}
a { color: inherit; text-decoration: none; }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky; top:0; z-index:50; display:flex; align-items:center; gap:18px;
  padding: 12px 22px; background: var(--bg-soft); border-bottom:1px solid var(--border);
  backdrop-filter: blur(8px);
}
.brand { font-size:20px; font-weight:800; display:flex; align-items:center; gap:6px; }
.nav-search { flex:1; max-width:520px; }
.nav-search input {
  width:100%; padding:9px 14px; border-radius:999px; border:1px solid var(--border);
  background: var(--bg); color:var(--text); font-size:14px; outline:none;
}
.nav-search input:focus { border-color: var(--primary); box-shadow:0 0 0 3px var(--primary-soft); }
.nav-links { display:flex; align-items:center; gap:14px; font-size:14px; }
.nav-links a { color: var(--muted); transition:.2s; }
.nav-links a:hover { color: var(--primary); }
.theme-toggle { background:none; border:1px solid var(--border); border-radius:999px; padding:6px 10px; cursor:pointer; font-size:15px; }

/* ===== 容器 ===== */
.container { max-width:1200px; margin:0 auto; padding:24px 18px 60px; }

/* ===== 首页 Hero ===== */
.hero { text-align:center; padding:36px 10px 22px; }
.hero h1 { font-size:32px; margin:0 0 6px; background:linear-gradient(90deg,var(--primary),var(--accent)); -webkit-background-clip:text; background-clip:text; color:transparent; }
.hero p { color:var(--muted); margin:0 0 18px; }
.hero .search { width:min(560px,92%); padding:13px 18px; font-size:15px; border-radius:999px; border:1px solid var(--border); background:var(--bg-soft); color:var(--text); outline:none; }
.hero .search:focus { border-color:var(--primary); box-shadow:0 0 0 3px var(--primary-soft); }

/* ===== 分类标签 ===== */
.chips { display:flex; flex-wrap:wrap; gap:8px; justify-content:center; margin:8px 0 26px; }
.chip { border:1px solid var(--border); background:var(--bg-soft); color:var(--muted); padding:7px 14px; border-radius:999px; cursor:pointer; font-size:13px; transition:.2s; }
.chip:hover { border-color:var(--primary); color:var(--primary); }
.chip.active { background:var(--primary); color:#fff; border-color:var(--primary); }

/* ===== 卡片网格 ===== */
.cat-title { font-size:18px; margin:26px 0 12px; scroll-margin-top:80px; }
.grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(220px,1fr)); gap:14px; }
.card {
  display:flex; gap:13px; padding:16px; background:var(--bg-soft); border:1px solid var(--border);
  border-radius:var(--radius); box-shadow:var(--shadow); transition:.2s; position:relative; align-items:flex-start;
}
.card:hover { transform:translateY(-3px); box-shadow:var(--shadow-h); border-color:var(--primary); }
.card-ic { font-size:26px; line-height:1; }
.card-body { flex:1; min-width:0; }
.card-title { font-weight:700; font-size:15px; display:flex; align-items:center; justify-content:space-between; gap:6px; }
.card-desc { font-size:12.5px; color:var(--muted); margin-top:3px; }
.need { font-size:10.5px; color:var(--warn); border:1px solid var(--warn); border-radius:6px; padding:0 5px; white-space:nowrap; }
.fav-btn { background:none; border:none; cursor:pointer; font-size:17px; color:var(--muted); line-height:1; padding:0; }
.fav-btn.on { color:#f59e0b; }
.empty { text-align:center; color:var(--muted); padding:40px; }

/* ===== 工具页 ===== */
.breadcrumb { font-size:13px; color:var(--muted); margin-bottom:14px; display:flex; align-items:center; gap:6px; flex-wrap:wrap; }
.breadcrumb a:hover { color:var(--primary); }
.tool-wrap { background:var(--bg-soft); border:1px solid var(--border); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow); }
.tool-head { display:flex; gap:16px; align-items:center; margin-bottom:18px; }
.tool-ic { font-size:40px; }
.tool-head h1 { margin:0; font-size:22px; }
.tool-head p { margin:4px 0 0; color:var(--muted); font-size:14px; }
.hint { font-size:12.5px; color:var(--warn); background:rgba(217,119,6,.08); padding:6px 10px; border-radius:8px; display:inline-block; }

.tool-form { display:grid; gap:14px; }
.field { display:flex; flex-direction:column; gap:6px; }
.field > label { font-size:13.5px; font-weight:600; }
.req { color:var(--err); }
.field textarea, .field input[type=text], .field select, .field input[type=search] {
  width:100%; padding:10px 12px; border:1px solid var(--border); border-radius:var(--radius-s);
  background:var(--bg); color:var(--text); font-size:14px; outline:none; font-family:inherit;
}
.field textarea { min-height:120px; resize:vertical; font-family:ui-monospace,Menlo,Consolas,monospace; font-size:13px; }
.field textarea:focus, .field input:focus, .field select:focus { border-color:var(--primary); box-shadow:0 0 0 3px var(--primary-soft); }
.field label.inline { flex-direction:row; display:flex; align-items:center; gap:6px; font-weight:400; }
.field input[type=range] { width:100%; }
.field output { font-size:13px; color:var(--muted); }

.dropzone { border:2px dashed var(--border); border-radius:var(--radius-s); padding:22px; text-align:center; color:var(--muted); cursor:pointer; transition:.2s; position:relative; }
.dropzone.drag { border-color:var(--primary); background:var(--primary-soft); }
.dropzone input[type=file] { position:absolute; inset:0; opacity:0; cursor:pointer; }
.dropzone span { pointer-events:none; }

.actions { display:flex; gap:10px; margin-top:6px; }
.btn { padding:11px 20px; border-radius:var(--radius-s); border:1px solid var(--border); background:var(--bg); color:var(--text); cursor:pointer; font-size:14px; transition:.2s; }
.btn:hover { border-color:var(--primary); }
.btn.primary { background:var(--primary); color:#fff; border-color:var(--primary); font-weight:600; }
.btn.primary:hover { filter:brightness(1.08); }
.btn:disabled { opacity:.6; cursor:wait; }

/* ===== 结果区 ===== */
.result { margin-top:18px; padding:16px; border:1px solid var(--border); border-radius:var(--radius-s); background:var(--bg); }
.result.ok { border-color:var(--ok); }
.result.err { border-color:var(--err); }
.result pre { white-space:pre-wrap; word-break:break-all; font-family:ui-monospace,Menlo,Consolas,monospace; font-size:13px; margin:0; }
.result .download { display:inline-flex; gap:6px; align-items:center; margin-top:10px; padding:9px 16px; background:var(--primary); color:#fff; border-radius:var(--radius-s); font-weight:600; }
.result .meta { font-size:12.5px; color:var(--muted); margin-top:8px; }

.progress { margin-top:16px; display:flex; align-items:center; gap:10px; color:var(--muted); font-size:13px; }
.progress .bar { width:90px; height:6px; background:var(--border); border-radius:4px; overflow:hidden; position:relative; }
.progress .bar::after { content:''; position:absolute; left:0; top:0; height:100%; width:40%; background:var(--primary); animation:slide 1s infinite; }
@keyframes slide { 0%{left:-40%} 100%{left:100%} }

/* ===== 调色板 / 差异 ===== */
.palette { display:flex; flex-wrap:wrap; gap:12px; }
.swatch { text-align:center; font-size:12px; color:var(--muted); }
.swatch span { display:block; width:54px; height:54px; border-radius:10px; margin-bottom:4px; border:1px solid var(--border); }
.diff { font-family:ui-monospace,Menlo,Consolas,monospace; font-size:13px; white-space:pre-wrap; }
.d-eq { color:var(--text); }
.d-add { background:rgba(22,163,74,.12); color:var(--ok); }
.d-del { background:rgba(220,38,38,.12); color:var(--err); }

/* ===== Toast ===== */
.toast { position:fixed; bottom:24px; left:50%; transform:translateX(-50%); background:var(--text); color:var(--bg-soft); padding:11px 20px; border-radius:999px; font-size:14px; box-shadow:var(--shadow); opacity:0; transition:.3s; z-index:100; pointer-events:none; }
.toast.show { opacity:1; transform:translateX(-50%) translateY(-4px); }

/* ===== 页脚 ===== */
.footer { text-align:center; padding:30px 16px; color:var(--muted); font-size:13px; border-top:1px solid var(--border); margin-top:40px; }
.footer .muted { opacity:.7; font-size:12px; }

/* ===== 响应式 ===== */
@media (max-width:640px) {
  .navbar { flex-wrap:wrap; gap:10px; padding:10px 14px; }
  .nav-search { order:3; flex-basis:100%; max-width:none; }
  .hero h1 { font-size:26px; }
  .grid { grid-template-columns:repeat(auto-fill,minmax(150px,1fr)); gap:10px; }
  .card { padding:13px; }
  .tool-wrap { padding:16px; }
}