:root {
  --tools-ink: #1d1d1f;
  --tools-muted: #6e6e73;
  --tools-line: rgba(0, 0, 0, .09);
  --tools-bg: #f5f5f7;
  --tools-surface: rgba(255, 255, 255, .86);
  --tools-blue: #0071e3;
  --tools-blue-dark: #0066cc;
  --tools-green: #127a4a;
  --tools-orange: #c75600;
  --tools-red: #b42318;
  --tools-radius: 18px;
  --tools-shadow: 0 12px 32px rgba(0, 0, 0, .07);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--tools-bg); }
body.tools-page {
  min-height: 100vh; margin: 0; color: var(--tools-ink); background:
    radial-gradient(circle at 5% -10%, rgba(0, 113, 227, .12), transparent 27rem),
    radial-gradient(circle at 100% 0%, rgba(41, 151, 255, .10), transparent 25rem), var(--tools-bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
.tools-topbar { height: 64px; max-width: 1240px; padding: 0 28px; margin: auto; display: flex; align-items: center; justify-content: space-between; }
.tools-brand { display: inline-flex; align-items: center; gap: 9px; font-size: 16px; font-weight: 650; letter-spacing: -.02em; }
.tools-brand-mark { display: inline-grid; place-items: center; width: 34px; height: 26px; border-radius: 8px; background: #1d1d1f; color: #fff; font-size: 11px; letter-spacing: .04em; }
.tools-nav { display: flex; align-items: center; gap: 6px; }
.tools-nav a { padding: 7px 10px; color: var(--tools-muted); border-radius: 8px; font-size: 13px; }
.tools-nav a:hover { background: rgba(0,0,0,.055); color: var(--tools-ink); }
.tools-main { width: min(100% - 40px, 1120px); margin: 0 auto; padding: 42px 0 56px; }
.tools-intro { max-width: 720px; margin-bottom: 28px; }
.tools-eyebrow { margin: 0 0 8px; color: var(--tools-blue); font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.tools-intro h1 { margin: 0; font-size: clamp(30px, 5vw, 46px); line-height: 1.12; letter-spacing: -.055em; }
.tools-intro > p:not(.tools-eyebrow) { margin: 13px 0 0; color: var(--tools-muted); font-size: 16px; line-height: 1.65; }
.tools-footer { width: min(100% - 40px, 1120px); display: flex; justify-content: space-between; gap: 12px; padding: 24px 0 30px; margin: 0 auto; border-top: 1px solid var(--tools-line); color: var(--tools-muted); font-size: 13px; }
.tools-footer a:hover { color: var(--tools-blue); }
.tool-panel { padding: clamp(20px, 4vw, 32px); border: 1px solid rgba(255,255,255,.85); border-radius: var(--tools-radius); background: var(--tools-surface); box-shadow: var(--tools-shadow); backdrop-filter: blur(14px); }
.tool-panel + .tool-panel { margin-top: 18px; }
.tool-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.tool-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.tool-field { min-width: 0; }
.tool-field label, .tool-label { display: block; margin: 0 0 8px; font-size: 13px; font-weight: 650; }
.tool-field small { display: block; margin-top: 7px; color: var(--tools-muted); font-size: 12px; line-height: 1.45; }
.tool-input, .tool-textarea, .tool-select { width: 100%; border: 1px solid var(--tools-line); border-radius: 11px; padding: 11px 13px; outline: none; color: var(--tools-ink); background: rgba(255,255,255,.85); transition: border-color .18s, box-shadow .18s; }
.tool-input, .tool-select { height: 44px; }
.tool-textarea { min-height: 220px; line-height: 1.55; resize: vertical; }
.tool-input:focus, .tool-textarea:focus, .tool-select:focus { border-color: rgba(0, 113, 227, .7); box-shadow: 0 0 0 4px rgba(0, 113, 227, .12); }
.tool-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 22px; }
.tool-button { appearance: none; min-height: 42px; padding: 0 17px; border: 0; border-radius: 980px; cursor: pointer; color: #fff; background: var(--tools-blue); font-size: 14px; font-weight: 600; transition: background .18s, transform .18s; }
.tool-button:hover { background: var(--tools-blue-dark); transform: translateY(-1px); }
.tool-button--secondary { color: var(--tools-ink); background: rgba(0,0,0,.065); }
.tool-button--secondary:hover { background: rgba(0,0,0,.12); }
.tool-button--warm { background: var(--tools-orange); }
.tool-button--warm:hover { background: #a74700; }
.tool-button--danger { background: var(--tools-red); }
.tool-button--danger:hover { background: #8f1b12; }
.tool-result { margin-top: 22px; padding: 18px 20px; border: 1px solid rgba(18,122,74,.16); border-radius: 14px; background: rgba(46, 204, 113, .08); }
.tool-result h2, .tool-panel h2 { margin: 0 0 10px; font-size: 17px; letter-spacing: -.02em; }
.tool-result p { margin: 0; line-height: 1.55; }
.tool-empty { color: var(--tools-muted); font-size: 14px; }
.tool-stat { font-size: clamp(30px, 6vw, 54px); font-weight: 720; letter-spacing: -.06em; }
.tool-stat small { margin-left: 7px; color: var(--tools-muted); font-size: 15px; font-weight: 500; letter-spacing: 0; }
.tool-kicker { margin: 0 0 6px; color: var(--tools-muted); font-size: 13px; }
.tool-note { margin: 18px 0 0; color: var(--tools-muted); font-size: 13px; line-height: 1.6; }
.tool-pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.tool-pill { padding: 7px 10px; border-radius: 99px; background: rgba(0,0,0,.055); color: #424245; font-size: 13px; }
.tools-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.tools-cards--compact { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.tools-card { min-height: 118px; padding: 20px; border: 1px solid rgba(255,255,255,.82); border-radius: 17px; background: rgba(255,255,255,.78); box-shadow: 0 7px 24px rgba(0,0,0,.045); }
.tools-card-icon { display: grid; place-items: center; width: 36px; height: 36px; margin-bottom: 16px; border-radius: 11px; background: #e9f2ff; color: #0066cc; font-size: 17px; font-weight: 700; }
.tools-card h3 { margin: 0; font-size: 16px; letter-spacing: -.025em; }
.tools-card p { margin: 7px 0 0; color: var(--tools-muted); font-size: 13px; line-height: 1.5; }
.tool-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.tool-tab { padding: 9px 16px; border-radius: 980px; background: rgba(0,0,0,.055); color: var(--tools-muted); font-size: 14px; font-weight: 600; cursor: pointer; border: 0; }
.tool-tab.is-active { background: var(--tools-blue); color: #fff; }
.tool-tabpanel[hidden] { display: none; }
@media (max-width: 760px) {
  .tools-topbar { height: 58px; padding: 0 20px; }
  .tools-main { width: min(100% - 28px, 1120px); padding: 30px 0 42px; }
  .tools-footer { width: min(100% - 28px, 1120px); }
  .tools-grid, .tool-grid, .tool-grid--3, .tools-cards, .tools-cards--compact { grid-template-columns: 1fr; }
  .tool-textarea { min-height: 180px; }
}