:root {
  --primary: #5b5bd6;
  --primary-dark: #4848b8;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e6e8f0;
  --radius: 14px;
  --shadow: 0 2px 12px rgba(31, 36, 48, 0.06);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6;
}
a { color: inherit; text-decoration: none; }

/* 顶部导航 */
.nav {
  position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--border);
}
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; gap: 24px; }
.logo { font-weight: 700; font-size: 18px; color: var(--primary); }
.nav-links { display: flex; gap: 20px; font-size: 14px; color: var(--muted); }
.nav-links a:hover { color: var(--primary); }

/* Hero */
.hero {
  max-width: 1080px; margin: 0 auto; padding: 72px 20px 48px; text-align: center;
}
.hero h1 { font-size: 40px; letter-spacing: 1px; }
.hero p { margin-top: 14px; color: var(--muted); font-size: 17px; }
.hero .badge {
  display: inline-block; margin-bottom: 16px; padding: 4px 14px; font-size: 13px;
  color: var(--primary); background: #eef0ff; border-radius: 999px;
}

/* 分类筛选 */
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px 64px; }
.tabs { display: flex; gap: 10px; margin: 24px 0; flex-wrap: wrap; }
.tab {
  padding: 7px 18px; border-radius: 999px; font-size: 14px; cursor: pointer;
  background: var(--card); border: 1px solid var(--border); color: var(--muted);
}
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 工具宫格 */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.tool-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s;
  display: block;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(91,91,214,.12); }
.tool-card .icon { font-size: 30px; }
.tool-card h3 { margin: 10px 0 6px; font-size: 16px; }
.tool-card p { font-size: 13px; color: var(--muted); }
.tool-card .cat { display: inline-block; margin-top: 12px; font-size: 12px; color: var(--primary); background: #eef0ff; padding: 2px 10px; border-radius: 999px; }

/* 表单 & 按钮 */
.btn {
  display: inline-block; padding: 11px 28px; border-radius: 10px; border: none; cursor: pointer;
  background: var(--primary); color: #fff; font-size: 15px; font-weight: 600;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-ghost:hover { background: #eef0ff; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.field label .req { color: #e5484d; margin-left: 2px; }
.field input[type=text], .field textarea, .field select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px;
  font-size: 14px; font-family: inherit; background: #fff;
}
.field textarea { min-height: 100px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid rgba(91,91,214,.3); border-color: var(--primary); }

/* 工具运行页布局 */
.run-layout { display: grid; grid-template-columns: 380px 1fr; gap: 20px; align-items: start; }
@media (max-width: 860px) { .run-layout { grid-template-columns: 1fr; } }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.panel h2 { font-size: 17px; margin-bottom: 16px; }
.output {
  white-space: pre-wrap; word-break: break-word; min-height: 280px; font-size: 14.5px;
  background: #fbfbfd; border: 1px dashed var(--border); border-radius: 10px; padding: 16px;
}
.output:empty::before { content: '生成结果会实时显示在这里…'; color: var(--muted); }
.output img { max-width: 100%; border-radius: 10px; }
.stage-tip { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.copy-row { margin-top: 12px; display: flex; gap: 10px; }

/* 页脚 */
.footer { border-top: 1px solid var(--border); padding: 28px 20px; text-align: center; color: var(--muted); font-size: 13px; }

/* 后台 */
.admin-tabs { display: flex; gap: 8px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.admin-tab { padding: 10px 18px; cursor: pointer; font-size: 14px; color: var(--muted); border-bottom: 2px solid transparent; }
.admin-tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
table.list { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.list th, table.list td { padding: 10px 8px; border-bottom: 1px solid var(--border); text-align: left; }
table.list th { color: var(--muted); font-weight: 600; background: #fafafc; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; }
.tag.on { background: #e6f6ec; color: #18794e; }
.tag.off { background: #fdebec; color: #cd2b31; }
.tag.cat { background: #eef0ff; color: var(--primary); }
.row-actions button { margin-right: 6px; padding: 4px 10px; font-size: 12.5px; border-radius: 6px; border: 1px solid var(--border); background: #fff; cursor: pointer; }
.row-actions button:hover { border-color: var(--primary); color: var(--primary); }
.modal-mask { position: fixed; inset: 0; background: rgba(20,22,35,.45); display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px; overflow: auto; z-index: 100; }
.modal { background: #fff; border-radius: var(--radius); padding: 28px; width: 720px; max-width: 100%; }
.modal h3 { margin-bottom: 18px; }
.modal .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }
.mono { font-family: Consolas, "Courier New", monospace; font-size: 13px; }
.toast {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
  background: #1f2430; color: #fff; padding: 10px 22px; border-radius: 10px; font-size: 14px; z-index: 200;
}
.login-box { max-width: 380px; margin: 90px auto; }
.login-box h2 { text-align: center; margin-bottom: 24px; }