:root {
  --bg: #f5f7fb;
  --bg-soft: #ffffff;
  --bg-code: #0d1424;
  --fg: #17203a;
  --fg-soft: #5c6b8a;
  --line: #e4e8f2;
  --brand: #3b6df5;
  --brand-2: #7a5cf0;
  --brand-soft: #e9efff;
  --ok: #12a150;
  --warn: #d97706;
  --err: #d92d4b;
  --radius: 16px;
  --radius-sm: 11px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 10px 30px rgba(16, 24, 40, .07);
  --shadow-hover: 0 2px 6px rgba(16, 24, 40, .06), 0 18px 44px rgba(59, 109, 245, .16);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --ease: cubic-bezier(.22, .61, .36, 1);
}
html[data-theme="dark"] {
  --bg: #080b14;
  --bg-soft: #111726;
  --bg-code: #05080f;
  --fg: #e8eefb;
  --fg-soft: #93a1bd;
  --line: #222c42;
  --brand: #6c9bff;
  --brand-2: #a48bff;
  --brand-soft: #16203a;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 34px rgba(0, 0, 0, .45);
  --shadow-hover: 0 2px 8px rgba(0, 0, 0, .5), 0 22px 50px rgba(108, 155, 255, .18);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--fg); background: var(--bg);
  font: 15.5px/1.72 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(900px 480px at 8% -8%, color-mix(in srgb, var(--brand) 13%, transparent), transparent 70%),
    radial-gradient(760px 420px at 100% 0%, color-mix(in srgb, var(--brand-2) 12%, transparent), transparent 65%);
  background-attachment: fixed;
}
a { color: var(--brand); text-decoration: none; transition: color .18s var(--ease); }
a:hover { text-decoration: underline; }
code, pre, kbd { font-family: var(--mono); }
::selection { background: color-mix(in srgb, var(--brand) 30%, transparent); }

/* ---------- 布局 ---------- */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
header.site {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
}
header.site .inner { display: flex; align-items: center; gap: 16px; height: 60px; }
.logo { font-weight: 800; font-size: 16.5px; color: var(--fg); letter-spacing: .2px; }
.logo span {
  background: linear-gradient(100deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
header.site nav { display: flex; gap: 2px; margin-left: auto; flex-wrap: wrap; }
header.site nav a {
  color: var(--fg-soft); padding: 7px 11px; border-radius: 10px; font-size: 14px;
  position: relative; transition: all .18s var(--ease);
}
header.site nav a:hover, header.site nav a.active {
  color: var(--fg); background: var(--brand-soft); text-decoration: none;
  transform: translateY(-1px);
}
header.site nav a.active::after {
  content: ""; position: absolute; left: 11px; right: 11px; bottom: 3px; height: 2px;
  border-radius: 2px; background: linear-gradient(90deg, var(--brand), var(--brand-2));
}
#theme-toggle {
  border: 1px solid var(--line); background: var(--bg-soft); color: var(--fg);
  width: 36px; height: 36px; border-radius: 11px; cursor: pointer; font-size: 15px;
  transition: transform .25s var(--ease), border-color .18s;
}
#theme-toggle:hover { transform: rotate(-18deg) scale(1.06); border-color: var(--brand); }
main { padding: 34px 0 70px; }

/* ---------- 首屏 ---------- */
.hero { text-align: center; padding: 24px 0 10px; }
.hero h1 {
  font-size: clamp(24px, 4.6vw, 34px); margin: 0 0 12px; letter-spacing: -.5px;
  background: linear-gradient(100deg, var(--fg) 20%, var(--brand) 60%, var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: rise .7s var(--ease) both;
}
.hero p { color: var(--fg-soft); margin: 0 auto; max-width: 660px; animation: rise .7s .08s var(--ease) both; }
.hero .cta { margin-top: 22px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; animation: rise .7s .16s var(--ease) both; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border-radius: var(--radius-sm); border: 1px solid var(--line);
  background: var(--bg-soft); color: var(--fg); font-size: 14px; cursor: pointer;
  transition: all .18s var(--ease); font-family: inherit;
}
.btn:hover { text-decoration: none; border-color: var(--brand); color: var(--brand); transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(.985); }
.btn.primary {
  background: linear-gradient(100deg, var(--brand), var(--brand-2));
  border-color: transparent; color: #fff;
  box-shadow: 0 6px 18px color-mix(in srgb, var(--brand) 32%, transparent);
}
.btn.primary:hover { color: #fff; filter: brightness(1.06); box-shadow: 0 9px 24px color-mix(in srgb, var(--brand) 42%, transparent); }
.btn.small { padding: 6px 11px; font-size: 13px; }

h2.section {
  font-size: 18px; margin: 44px 0 16px; display: flex; align-items: center; gap: 9px;
  scroll-margin-top: 80px;
}
h2.section small { font-weight: 400; color: var(--fg-soft); font-size: 13px; }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(252px, 1fr)); }
.card {
  position: relative; overflow: hidden;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 17px 19px; box-shadow: var(--shadow);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: color-mix(in srgb, var(--brand) 40%, var(--line)); }
.card:hover::before { transform: scaleX(1); }
.card h3 { margin: 0 0 7px; font-size: 15.5px; display: flex; align-items: center; gap: 8px; }
.card p { margin: 0; color: var(--fg-soft); font-size: 13.5px; }
.card .tags { margin-top: 11px; display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  font-size: 12px; padding: 2.5px 9px; border-radius: 20px;
  background: var(--brand-soft); color: var(--brand); transition: transform .18s var(--ease);
}
.card:hover .tag { transform: translateY(-1px); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--fg-soft); display: inline-block; flex: 0 0 auto; }
.dot.ok { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent); }
.dot.warn { background: var(--warn); } .dot.err { background: var(--err); }
.dot.ok { animation: pulse 2.4s var(--ease) infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }

/* ---------- 工具页 ---------- */
.toolbar {
  position: sticky; top: 68px; z-index: 15; margin: 6px 0 18px;
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px); padding: 10px 12px; border-radius: var(--radius);
  border: 1px solid var(--line);
}
.toolbar input[type=search] {
  flex: 1 1 220px; min-width: 0; padding: 9px 13px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-soft); color: var(--fg);
  font-size: 14px; font-family: inherit;
}
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  font-size: 13px; padding: 6px 12px; border-radius: 20px; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg-soft); color: var(--fg-soft);
  transition: all .18s var(--ease); user-select: none;
}
.chip:hover { color: var(--brand); border-color: var(--brand); transform: translateY(-1px); }
.chip.active { background: linear-gradient(100deg, var(--brand), var(--brand-2)); color: #fff; border-color: transparent; }
.tool {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; box-shadow: var(--shadow); margin-bottom: 16px; scroll-margin-top: 130px;
  transition: box-shadow .22s var(--ease), border-color .22s;
}
.tool:hover { border-color: color-mix(in srgb, var(--brand) 26%, var(--line)); }
.tool header { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.tool .ic {
  width: 30px; height: 30px; flex: 0 0 auto; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand-soft), color-mix(in srgb, var(--brand-2) 18%, var(--brand-soft)));
  font-size: 15px;
}
.tool h3 { margin: 0; font-size: 15.5px; }
.tool .badge { margin-left: auto; font-size: 11.5px; color: var(--fg-soft); border: 1px solid var(--line); padding: 2px 8px; border-radius: 20px; }
.tool .desc { color: var(--fg-soft); font-size: 13px; margin: 0 0 13px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-start; }
.row > * { flex: 1 1 220px; min-width: 0; }
textarea, input[type=text], input[type=number], input[type=search], select {
  width: 100%; padding: 10px 12px; border-radius: var(--radius-sm); border: 1px solid var(--line);
  background: var(--bg); color: var(--fg); font-family: var(--mono); font-size: 13px;
  resize: vertical; transition: border-color .18s, box-shadow .18s;
}
textarea { min-height: 106px; line-height: 1.6; }
textarea:focus, input:focus, select:focus {
  outline: none; border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent);
}
label.field { display: block; font-size: 12.5px; color: var(--fg-soft); margin-bottom: 5px; }
.tool .actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 0; }
.hint { font-size: 12.5px; color: var(--fg-soft); margin-top: 9px; }
.tool.hidden { display: none; }
.cat { scroll-margin-top: 130px; }

/* ---------- 文章 ---------- */
article.post {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 32px; box-shadow: var(--shadow); animation: rise .5s var(--ease) both;
}
article.post h1 { margin-top: 0; font-size: 26px; letter-spacing: -.3px; }
article.post h2 { font-size: 18px; margin-top: 32px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
article.post h3 { font-size: 16px; margin-top: 24px; }
article.post p, article.post li { color: color-mix(in srgb, var(--fg) 88%, var(--fg-soft)); }
article.post code { background: var(--brand-soft); color: var(--brand); padding: 1.5px 6px; border-radius: 6px; font-size: 13px; }
article.post pre { background: var(--bg-code); color: #e6edf3; padding: 15px 17px; border-radius: 12px; overflow: auto; }
article.post pre code { background: none; color: inherit; padding: 0; }
article.post blockquote {
  margin: 18px 0; padding: 10px 18px; border-left: 3px solid var(--brand);
  background: var(--brand-soft); border-radius: 0 10px 10px 0; color: var(--fg-soft);
}
.meta { color: var(--fg-soft); font-size: 13px; margin: 0 0 18px; }
.posts-list { display: grid; gap: 14px; }

footer.site { border-top: 1px solid var(--line); padding: 28px 0 44px; color: var(--fg-soft); font-size: 13px; }
footer.site a { color: var(--fg-soft); }
footer.site a:hover { color: var(--brand); }

/* ---------- 动画 / 工具类 ---------- */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }
#to-top {
  position: fixed; right: 20px; bottom: 22px; z-index: 40;
  width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--line);
  background: var(--bg-soft); color: var(--fg); cursor: pointer; font-size: 17px;
  box-shadow: var(--shadow); opacity: 0; pointer-events: none;
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}
#to-top.show { opacity: 1; pointer-events: auto; }
#to-top:hover { transform: translateY(-3px); border-color: var(--brand); color: var(--brand); }
#toast {
  position: fixed; left: 50%; bottom: 30px; transform: translate(-50%, 20px);
  padding: 10px 18px; border-radius: 12px; color: #fff; font-size: 13.5px; z-index: 99;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .28); background: #26314d;
  opacity: 0; pointer-events: none; transition: opacity .25s var(--ease), transform .25s var(--ease);
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}
@media (max-width: 680px) {
  .hero h1 { font-size: 23px; }
  article.post { padding: 20px 18px; }
  header.site nav a { padding: 5px 8px; font-size: 13px; }
  .toolbar { top: 62px; }
}