:root {
  color-scheme: light;
  --bg: #f7f2ea;
  --surface: rgba(255,255,255,.72);
  --surface-hover: rgba(255,255,255,.9);
  --text: #1a1e2a;
  --muted: #6b7280;
  --accent: #e85d30;
  --line: rgba(15,24,36,.07);
  --shadow: 0 16px 48px rgba(16,30,44,.1);
  --shadow-hover: 0 20px 56px rgba(16,30,44,.16);
  --radius: 20px;
  --font: "MiSans","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --cover-stroke: #3d3832;
  --cover-del: #d94040;
  --cover-add: #22863a;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1724;
  --surface: rgba(28,38,56,.7);
  --surface-hover: rgba(36,48,68,.88);
  --text: #e9eef8;
  --muted: #94a3b8;
  --accent: #ff7a52;
  --line: rgba(196,210,230,.1);
  --shadow: 0 16px 48px rgba(0,0,0,.3);
  --shadow-hover: 0 20px 56px rgba(0,0,0,.4);
  --cover-stroke: #c8d0dc;
  --cover-del: #f87171;
  --cover-add: #6ee7a0;
}

*{box-sizing:border-box;margin:0}
html,body{min-height:100%}
body{
  font-family:var(--font);
  color:var(--text);
  background:
    radial-gradient(ellipse at 15% 10%,rgba(232,93,48,.14),transparent 40%),
    radial-gradient(ellipse at 85% 20%,rgba(94,180,160,.12),transparent 36%),
    var(--bg);
}
:root[data-theme="dark"] body{
  background:
    radial-gradient(ellipse at 15% 10%,rgba(255,122,82,.1),transparent 40%),
    radial-gradient(ellipse at 85% 20%,rgba(94,211,208,.08),transparent 36%),
    var(--bg);
}

.page-shell{
  position:relative;max-width:960px;margin:0 auto;padding:0 24px;
  min-height:100vh;display:flex;flex-direction:column;
}
.ambient{position:fixed;border-radius:50%;pointer-events:none;filter:blur(80px);opacity:.18}
.a1{width:420px;height:420px;top:-120px;left:-100px;background:var(--accent)}
.a2{width:340px;height:340px;bottom:-80px;right:-60px;background:#5eb4a0}

.site-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:28px 0 16px;
}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:700;font-size:17px}
.theme-btn{
  background:none;border:1px solid var(--line);border-radius:10px;
  width:38px;height:38px;display:grid;place-items:center;cursor:pointer;
  color:var(--text);transition:border-color .2s;
}
.theme-btn:hover{border-color:var(--accent)}
:root[data-theme="dark"] .icon-sun{display:none}
:root:not([data-theme="dark"]) .icon-moon{display:none}

.hero{padding:48px 0 36px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,40px);font-weight:800;letter-spacing:-.02em;line-height:1.2}
.hero-desc{color:var(--muted);font-size:16px;margin-top:10px}

.tools-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:20px;
  padding-bottom:48px;
}
.tool-card{
  text-decoration:none;color:inherit;border-radius:var(--radius);
  background:var(--surface);border:1px solid var(--line);
  overflow:hidden;transition:transform .25s,box-shadow .25s,background .25s;
  box-shadow:var(--shadow);
}
.tool-card:hover{
  transform:translateY(-4px);box-shadow:var(--shadow-hover);
  background:var(--surface-hover);
}

.card-cover{
  height:120px;display:grid;place-items:center;
  border-bottom:1px solid var(--line);
  position:relative;overflow:hidden;
}
.card-cover svg{width:110px;height:auto}
.cover-timestamp{background:linear-gradient(135deg,rgba(232,93,48,.08),rgba(255,180,100,.06))}
.cover-datediff{background:linear-gradient(135deg,rgba(15,139,141,.08),rgba(223,109,87,.06))}
.cover-password{background:linear-gradient(135deg,rgba(94,180,160,.1),rgba(40,140,100,.05))}
.cover-textdiff{background:linear-gradient(135deg,rgba(80,120,200,.08),rgba(130,80,200,.05))}
:root[data-theme="dark"] .cover-timestamp{background:linear-gradient(135deg,rgba(255,122,82,.1),rgba(255,180,100,.05))}
:root[data-theme="dark"] .cover-datediff{background:linear-gradient(135deg,rgba(94,211,208,.1),rgba(255,155,136,.06))}
:root[data-theme="dark"] .cover-password{background:linear-gradient(135deg,rgba(110,231,160,.08),rgba(40,180,120,.05))}
:root[data-theme="dark"] .cover-textdiff{background:linear-gradient(135deg,rgba(100,140,240,.08),rgba(160,100,240,.05))}

.card-body{padding:18px 20px 22px}
.card-body h2{font-size:17px;font-weight:700;margin-bottom:6px}
.card-body p{font-size:13.5px;color:var(--muted);line-height:1.55}

.site-footer{
  margin-top:auto;padding:24px 0;text-align:center;
  color:var(--muted);font-size:13px;border-top:1px solid var(--line);
}

@media(max-width:600px){
  .page-shell{padding:0 16px}
  .hero{padding:32px 0 24px}
  .tools-grid{gap:16px}
  .card-cover{height:100px}
  .card-cover svg{width:90px}
}