:root {
  --bg: #070a12;
  --bg-soft: #0e1322;
  --bg-card: #131a2b;
  --bg-input: #0b1120;
  --border: rgba(80, 150, 230, 0.18);
  --border-strong: rgba(80, 150, 230, 0.45);
  --text: #eef2fb;
  --text-dim: #9aa6c2;
  --text-faint: #6b7793;
  --accent: #2b84e0;
  --accent-2: #4fb0ee;
  --danger: #ff6b81;
  --ok: #46d39a;
  --warn: #ffcf6b;
  --grad: linear-gradient(120deg, #2b84e0 0%, #4fb0ee 55%, #cfd6e0 100%);
  --radius: 14px;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
}
[data-theme="light"] {
  --bg: #f4f6fc;
  --bg-soft: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f1f4fb;
  --border: rgba(40, 70, 160, 0.16);
  --border-strong: rgba(40, 70, 160, 0.4);
  --text: #11182c;
  --text-dim: #4a5775;
  --text-faint: #7a86a3;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
.app { display: flex; height: 100vh; overflow: hidden; }

/* ---------- Sidebar ---------- */
.sidebar {
  width: 290px; flex-shrink: 0;
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.brand { display: flex; align-items: center; gap: 12px; padding: 18px 18px 12px; }
.logo {
  width: 48px; height: 42px; flex-shrink: 0;
  display: grid; place-items: center;
}
.logo img { max-width: 100%; max-height: 100%; width: auto; height: auto; display: block; }
.brand-title { font-weight: 800; font-size: 17px; letter-spacing: -0.02em; }
.brand-title span { color: var(--accent); }
.brand-sub { font-size: 12px; color: var(--text-faint); }
.search-wrap { padding: 6px 14px 12px; }
#toolSearch {
  width: 100%; padding: 10px 12px; border-radius: 10px;
  background: var(--bg-input); border: 1px solid var(--border);
  color: var(--text); font-size: 13px; font-family: var(--sans); outline: none;
}
#toolSearch:focus { border-color: var(--border-strong); }
.tool-nav { flex: 1; overflow-y: auto; padding: 0 10px 16px; }
.nav-cat { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); margin: 14px 8px 6px; font-weight: 700; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 9px; cursor: pointer;
  color: var(--text-dim); font-size: 13.5px; font-weight: 500;
  border: 1px solid transparent;
}
.nav-item:hover { background: var(--bg-card); color: var(--text); }
.nav-item.active { background: var(--bg-card); color: var(--text); border-color: var(--border-strong); }
.nav-item .ti { width: 18px; text-align: center; opacity: .9; }
.sidebar-foot { padding: 12px 18px; font-size: 11px; color: var(--text-faint); border-top: 1px solid var(--border); }
.sidebar-foot .credit { margin-top: 6px; }
.sidebar-foot .credit strong { color: var(--text-dim); }
.sidebar-foot .credit a { color: var(--accent); text-decoration: none; }
.sidebar-foot .credit a:hover { text-decoration: underline; }

/* ---------- Content ---------- */
.content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 22px; border-bottom: 1px solid var(--border); background: var(--bg-soft);
}
.topbar-title { font-weight: 700; font-size: 16px; flex: 1; letter-spacing: -0.01em; }
.topbar-actions { display: flex; gap: 8px; }
.icon-btn {
  background: var(--bg-input); border: 1px solid var(--border); color: var(--text);
  width: 36px; height: 36px; border-radius: 9px; cursor: pointer; font-size: 15px;
}
.icon-btn:hover { border-color: var(--border-strong); }
.menu-btn { display: none; }
.tool-host { flex: 1; overflow-y: auto; padding: 26px; }

/* ---------- Tool layout ---------- */
.tool { max-width: 1100px; margin: 0 auto; }
.tool-head { margin-bottom: 18px; }
.tool-head h1 { font-size: 22px; margin: 0 0 6px; letter-spacing: -0.02em; }
.tool-head p { margin: 0; color: var(--text-dim); font-size: 14px; max-width: 70ch; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 820px) { .grid2 { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field > label { font-size: 12.5px; font-weight: 600; color: var(--text-dim); }
textarea, input[type=text], input[type=number], select {
  width: 100%; background: var(--bg-input); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text); padding: 11px 13px;
  font-family: var(--mono); font-size: 13px; outline: none; resize: vertical;
}
textarea { min-height: 180px; line-height: 1.55; }
textarea:focus, input:focus, select:focus { border-color: var(--border-strong); }
input[type=text].sans { font-family: var(--sans); }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; }
.btn {
  background: var(--accent); color: #fff; border: none; padding: 9px 16px;
  border-radius: 9px; cursor: pointer; font-weight: 600; font-size: 13px; font-family: var(--sans);
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: var(--bg-input); color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { border-color: var(--border-strong); }
.btn.sm { padding: 6px 11px; font-size: 12px; }
.chip {
  background: var(--bg-input); border: 1px solid var(--border); color: var(--text-dim);
  padding: 6px 11px; border-radius: 20px; cursor: pointer; font-size: 12.5px; font-weight: 500;
}
.chip:hover { border-color: var(--border-strong); color: var(--text); }
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
label.check { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--text-dim); cursor: pointer; }
label.check input { width: auto; }
.out {
  background: var(--bg-input); border: 1px solid var(--border); border-radius: 10px;
  padding: 13px; font-family: var(--mono); font-size: 13px; white-space: pre-wrap;
  word-break: break-word; min-height: 60px; line-height: 1.55;
}
.muted { color: var(--text-faint); }
.err { color: var(--danger); }
.ok { color: var(--ok); }
.warn { color: var(--warn); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; font-size: 13px; }
.kv .k { color: var(--text-faint); font-family: var(--mono); }
.kv .v { font-family: var(--mono); word-break: break-all; }
.copy-bar { display: flex; justify-content: flex-end; margin-top: 8px; }
.swatch { width: 100%; height: 90px; border-radius: 10px; border: 1px solid var(--border); }
table.ref { width: 100%; border-collapse: collapse; font-size: 13px; }
table.ref th, table.ref td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
table.ref th { color: var(--text-faint); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
table.ref td.code { font-family: var(--mono); }
.pill { font-family: var(--mono); font-size: 12px; padding: 2px 8px; border-radius: 6px; background: var(--bg-input); border: 1px solid var(--border); }
.markdown-out { font-family: var(--sans); line-height: 1.65; }
.markdown-out h1,.markdown-out h2,.markdown-out h3 { letter-spacing: -0.01em; }
.markdown-out pre { background: var(--bg-soft); padding: 12px; border-radius: 8px; overflow:auto; }
.markdown-out code { font-family: var(--mono); font-size: 12.5px; }
.markdown-out table { border-collapse: collapse; }
.markdown-out th, .markdown-out td { border: 1px solid var(--border); padding: 6px 10px; }
mark.hl { background: rgba(108,140,255,.35); color: var(--text); border-radius: 3px; }
.diff-line { font-family: var(--mono); font-size: 12.5px; white-space: pre-wrap; padding: 1px 6px; border-radius: 4px; }
.diff-add { background: rgba(70,211,154,.16); }
.diff-del { background: rgba(255,107,129,.16); }
.welcome-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 14px; margin-top: 18px; }
.wcard { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; cursor: pointer; }
.wcard:hover { border-color: var(--border-strong); transform: translateY(-2px); transition: .15s; }
.wcard .wi { font-size: 22px; }
.wcard h3 { margin: 8px 0 4px; font-size: 15px; }
.wcard p { margin: 0; font-size: 12.5px; color: var(--text-dim); }
.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 10px;
  font-size: 13px; font-weight: 600; opacity: 0; pointer-events: none; transition: .2s; z-index: 50;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* favorite star on nav items */
.nav-item { position: relative; }
.nav-item .star { margin-left: auto; opacity: 0; font-size: 13px; color: var(--text-faint); cursor: pointer; padding: 0 2px; }
.nav-item:hover .star { opacity: .8; }
.nav-item .star:hover { color: var(--warn); opacity: 1; }
.nav-item .star.faved { opacity: 1; color: var(--warn); }
kbd { font-family: var(--mono); font-size: 11px; background: var(--bg-input); border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 5px; padding: 1px 5px; color: var(--text-dim); }

/* settings dropdown */
.settings-wrap { position: relative; }
#settingsBtn { font-size: 19px; line-height: 1; }
.settings-menu { position: absolute; right: 0; top: 44px; background: var(--bg-soft); border: 1px solid var(--border-strong); border-radius: 12px; box-shadow: 0 18px 50px rgba(0,0,0,.4); padding: 8px; min-width: 230px; z-index: 60; }
.settings-menu[hidden] { display: none; }
.settings-title { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); font-weight: 700; padding: 6px 8px 8px; }
.settings-item { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; width: 100%; text-align: left; background: transparent; border: none; color: var(--text); font-family: var(--sans); font-size: 13.5px; font-weight: 600; padding: 9px 8px; border-radius: 8px; cursor: pointer; text-decoration: none; }
.settings-item:hover { background: var(--bg-card); }
.settings-item .muted { font-weight: 400; font-size: 11.5px; }

/* file transfer progress bar */
.bar { height: 10px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 6px; overflow: hidden; margin-top: 10px; }
.bar > div { height: 100%; width: 0; background: var(--grad); transition: width .12s linear; }
.sf-code { font-family: var(--mono); font-size: 26px; letter-spacing: 1px; margin: 10px 0; cursor: pointer; }

/* smart paste */
.smartpaste { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 22px; }
.sp-label { display: block; font-size: 13.5px; font-weight: 600; color: var(--text); margin-bottom: 8px; }
#spin { min-height: 64px; }
.sp-suggest { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.sp-chip { display: inline-flex; align-items: center; gap: 7px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 10px; padding: 8px 13px; cursor: pointer; font-size: 13px; color: var(--text); font-family: var(--sans); }
.sp-chip:hover { border-color: var(--border-strong); transform: translateY(-1px); transition: .12s; }
.sp-chip .muted { font-weight: 400; }

/* chain "send to" menu */
.chain-wrap { position: relative; }
#chainBtn { width: auto; padding: 0 11px; font-size: 13px; font-weight: 600; }
.chain-menu { position: absolute; right: 0; top: 44px; background: var(--bg-soft); border: 1px solid var(--border-strong); border-radius: 12px; box-shadow: 0 18px 50px rgba(0,0,0,.4); padding: 8px; min-width: 230px; max-height: 60vh; overflow-y: auto; z-index: 60; }
.chain-menu[hidden] { display: none; }
.chain-item { flex-direction: row !important; align-items: center !important; gap: 8px !important; }

/* command palette */
.palette-overlay { position: fixed; inset: 0; background: rgba(3,6,14,.55); backdrop-filter: blur(3px); z-index: 100; display: flex; align-items: flex-start; justify-content: center; padding-top: 12vh; }
.palette-overlay[hidden] { display: none; }
.palette { width: min(620px, 92vw); background: var(--bg-soft); border: 1px solid var(--border-strong); border-radius: 14px; box-shadow: 0 30px 80px rgba(0,0,0,.5); overflow: hidden; }
.palette input { width: 100%; border: none; border-bottom: 1px solid var(--border); border-radius: 0; background: transparent; font-family: var(--sans); font-size: 16px; padding: 16px 18px; }
.palette input:focus { border-color: var(--border); }
.palette-list { max-height: 50vh; overflow-y: auto; padding: 6px; }
.palette-item { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 9px; cursor: pointer; font-size: 14px; }
.palette-item .pi { width: 22px; text-align: center; }
.palette-item .pcat { margin-left: auto; font-size: 11px; color: var(--text-faint); }
.palette-item.sel, .palette-item:hover { background: var(--bg-card); }
.palette-item .pname { font-weight: 600; }
.palette-foot { padding: 9px 14px; border-top: 1px solid var(--border); font-size: 11px; color: var(--text-faint); }
.palette-empty { padding: 24px; text-align: center; color: var(--text-faint); }

/* about page */
.about { max-width: 760px; line-height: 1.7; }
.about h2 { font-size: 17px; margin: 22px 0 8px; letter-spacing: -0.01em; }
.about p, .about li { color: var(--text-dim); font-size: 14.5px; }
.about ul { padding-left: 20px; }
.about a { color: var(--accent); }

@media (max-width: 760px) {
  .sidebar { position: fixed; z-index: 40; height: 100%; transform: translateX(-100%); transition: .22s; }
  .sidebar.open { transform: translateX(0); box-shadow: 0 0 60px rgba(0,0,0,.5); }
  .menu-btn { display: block; }
  .tool-host { padding: 16px; }
}

/* ---------- splash screen (knife-gleam logo reveal) ---------- */
#splash {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 22px;
  background: radial-gradient(circle at 50% 44%, #0f1526 0%, #070a12 68%);
  animation: splashOut .55s ease 1.55s forwards;
}
#splash .splash-logo { position: relative; width: min(260px, 52vw); animation: logoIn .6s cubic-bezier(.18,.9,.25,1) .1s both; }
#splash .splash-logo img { width: 100%; display: block; filter: drop-shadow(0 10px 34px rgba(43,132,224,.38)); }
#splash .splash-gleam {
  position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(115deg, transparent 43%, rgba(255,255,255,.92) 50%, transparent 57%);
  background-size: 260% 100%; background-position: 150% 0; opacity: 0;
  -webkit-mask: url(logo-mark.png?v=2) center/contain no-repeat; mask: url(logo-mark.png?v=2) center/contain no-repeat;
  animation: gleam .75s ease .5s;
}
#splash .splash-word { font-family: var(--sans); font-weight: 800; font-size: 30px; letter-spacing: -.02em; color: var(--text); opacity: 0; animation: wordIn .5s ease .62s forwards; }
#splash .splash-word span { color: var(--accent); }
@keyframes logoIn { from { opacity: 0; transform: scale(.78) rotate(-7deg); } to { opacity: 1; transform: none; } }
@keyframes gleam { 0% { opacity: 0; background-position: 150% 0; } 25% { opacity: 1; } 100% { opacity: 0; background-position: -70% 0; } }
@keyframes wordIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes splashOut { to { opacity: 0; visibility: hidden; } }
@media (prefers-reduced-motion: reduce) {
  #splash { animation: splashOut .3s ease .5s forwards; }
  #splash .splash-logo, #splash .splash-gleam, #splash .splash-word { animation: none; opacity: 1; }
}