:root {
  --bg: #f5f6fb;
  --bg-grad: radial-gradient(1200px 600px at 100% -10%, #e9e6ff 0%, transparent 60%), radial-gradient(900px 500px at -10% 110%, #e3f4ff 0%, transparent 55%);
  --surface: #ffffff;
  --surface-2: #f7f8fc;
  --text: #1d2230;
  --muted: #6b7280;
  --border: #e8eaf2;
  --border-strong: #d8dbe8;
  --primary: #6366f1;
  --primary-2: #8b5cf6;
  --primary-soft: #eef0ff;
  --grad: linear-gradient(135deg, #6366f1, #8b5cf6);
  --grad-soft: linear-gradient(135deg, rgba(99,102,241,.12), rgba(139,92,246,.12));
  --ok: #15a36e;
  --warn: #e0a106;
  --err: #e23b54;
  --shadow: 0 10px 30px rgba(31, 38, 80, .08);
  --shadow-lg: 0 24px 60px rgba(31, 38, 80, .16);
  --radius: 16px;
  --radius-sm: 11px;
}

[data-theme="dark"] {
  --bg: #0e1016;
  --bg-grad: radial-gradient(1200px 600px at 100% -10%, rgba(99,102,241,.18) 0%, transparent 60%), radial-gradient(900px 500px at -10% 110%, rgba(139,92,246,.14) 0%, transparent 55%);
  --surface: #161922;
  --surface-2: #1c2030;
  --text: #e8eaf2;
  --muted: #9aa3b6;
  --border: #262b3a;
  --border-strong: #333a4d;
  --primary: #818cf8;
  --primary-2: #a78bfa;
  --primary-soft: #1f2236;
  --grad: linear-gradient(135deg, #818cf8, #a78bfa);
  --grad-soft: linear-gradient(135deg, rgba(129,140,248,.16), rgba(167,139,250,.16));
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #fb7185;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
::selection { background: rgba(99,102,241,.25); }

.app { display: flex; min-height: 100vh; }

/* ---------- Sidebar ---------- */
.sidebar {
  width: 268px;
  flex: 0 0 268px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
}
.brand { display: flex; align-items: center; gap: 12px; padding: 6px 8px 16px; }
.brand-logo {
  width: 42px; height: 42px; border-radius: 13px;
  background: var(--grad); color: #fff;
  display: grid; place-items: center;
  font-size: 20px; font-weight: 800;
  box-shadow: 0 8px 20px rgba(99,102,241,.4);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 18px; font-weight: 800; letter-spacing: .5px; }
.brand-sub { font-size: 12px; color: var(--muted); letter-spacing: 2px; }

.search-wrap { position: relative; margin-bottom: 14px; }
.search-ic { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--muted); }
#search {
  width: 100%; padding: 10px 12px 10px 38px;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--surface-2); color: var(--text);
  font-size: 14px; outline: none; transition: .2s;
}
#search:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }

.nav { flex: 1; overflow-y: auto; margin: 0 -4px; padding: 0 4px; }
.nav-group-title {
  font-size: 12px; color: var(--muted); font-weight: 700;
  padding: 14px 10px 6px; letter-spacing: 1px; text-transform: uppercase;
}
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 9px 11px; border-radius: 11px;
  cursor: pointer; color: var(--text); font-size: 14.5px;
  border: 1px solid transparent; transition: .15s; user-select: none;
}
.nav-item:hover { background: var(--surface-2); }
.nav-item.active { background: var(--primary-soft); border-color: rgba(99,102,241,.35); color: var(--primary); font-weight: 600; }
.nav-item .emoji { font-size: 17px; width: 22px; text-align: center; }
.nav-item.hidden { display: none; }
.sidebar-foot { padding: 12px 10px 2px; font-size: 11.5px; color: var(--muted); border-top: 1px solid var(--border); margin-top: 8px; }

/* ---------- Main ---------- */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  height: 60px; display: flex; align-items: center; gap: 12px;
  padding: 0 22px;
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-title { font-size: 16px; font-weight: 700; }
.menu-toggle {
  display: none; border: none; background: transparent; color: var(--text);
  cursor: pointer; padding: 6px; border-radius: 9px;
}
.topbar-actions { margin-left: auto; display: flex; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
  display: grid; place-items: center; transition: .15s;
}
.icon-btn:hover { border-color: var(--primary); color: var(--primary); }

.content { padding: 26px clamp(16px, 4vw, 40px) 60px; max-width: 980px; width: 100%; margin: 0 auto; }

/* ---------- Hero ---------- */
.hero {
  background: var(--grad); color: #fff; border-radius: 22px;
  padding: 30px 30px; box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -60px; top: -60px;
  width: 220px; height: 220px; border-radius: 50%;
  background: rgba(255,255,255,.16); filter: blur(6px);
}
.hero h1 { margin: 0 0 8px; font-size: 26px; letter-spacing: .5px; }
.hero p { margin: 0; opacity: .92; font-size: 14.5px; max-width: 60ch; }
.hero .chips { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.hero .chip {
  background: rgba(255,255,255,.16); padding: 6px 12px; border-radius: 999px;
  font-size: 12.5px; backdrop-filter: blur(4px);
}
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; margin-top: 22px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; cursor: pointer; transition: .18s; box-shadow: var(--shadow);
}
.card:hover { transform: translateY(-3px); border-color: var(--primary); }
.card .c-emoji { font-size: 24px; }
.card .c-name { font-weight: 700; margin-top: 8px; font-size: 15px; }
.card .c-desc { color: var(--muted); font-size: 12.5px; margin-top: 3px; }

/* ---------- Tool panel ---------- */
.tool-head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.tool-head .t-emoji {
  width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center;
  font-size: 26px; background: var(--grad-soft); border: 1px solid var(--border);
}
.tool-head h2 { margin: 0; font-size: 21px; }
.tool-head .t-desc { color: var(--muted); font-size: 13.5px; margin-top: 2px; }

.panel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; }
.row.end { justify-content: flex-end; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field label { font-size: 13px; color: var(--muted); font-weight: 600; }

textarea, input[type="text"], input[type="number"], input[type="password"], select {
  width: 100%; padding: 11px 13px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); background: var(--surface-2); color: var(--text);
  font-size: 14px; font-family: inherit; outline: none; transition: .15s;
}
textarea { resize: vertical; min-height: 130px; line-height: 1.55; font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
textarea:focus, input:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
input[type="range"] { width: 200px; accent-color: var(--primary); }

.btn {
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  padding: 9px 16px; border-radius: 11px; font-size: 13.5px; font-weight: 600;
  cursor: pointer; transition: .15s; display: inline-flex; align-items: center; gap: 7px;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--grad); border: none; color: #fff; box-shadow: 0 8px 20px rgba(99,102,241,.35); }
.btn.primary:hover { filter: brightness(1.06); color: #fff; }
.btn.ghost { background: transparent; }
.btn:active { transform: translateY(1px); }

.hint { font-size: 12.5px; color: var(--muted); }
.badge { font-size: 12px; padding: 3px 9px; border-radius: 999px; font-weight: 600; }
.badge.ok { background: color-mix(in srgb, var(--ok) 16%, transparent); color: var(--ok); }
.badge.err { background: color-mix(in srgb, var(--err) 16%, transparent); color: var(--err); }
.badge.warn { background: color-mix(in srgb, var(--warn) 16%, transparent); color: var(--warn); }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 720px) { .grid2 { grid-template-columns: 1fr; } }

.out {
  background: var(--surface-2); border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm); padding: 12px 14px; font-size: 13.5px;
  white-space: pre-wrap; word-break: break-all; min-height: 44px; color: var(--text);
}
.out.mono { font-family: ui-monospace, Consolas, monospace; }

.stat { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 12px; }
.stat .s-item { background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; min-width: 92px; }
.stat .s-num { font-size: 20px; font-weight: 800; }
.stat .s-lab { font-size: 12px; color: var(--muted); }

.switch { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--text); cursor: pointer; }
.switch input { width: 16px; height: 16px; accent-color: var(--primary); }

.qr-box { display: grid; place-items: center; padding: 16px; background: #fff; border-radius: 14px; }
.qr-box img, .qr-box canvas { max-width: 100%; }

.swatches { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.swatch { width: 64px; height: 64px; border-radius: 14px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.color-inputs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 560px){ .color-inputs { grid-template-columns: 1fr; } }

.diff-add { background: color-mix(in srgb, var(--ok) 20%, transparent); }
.diff-del { background: color-mix(in srgb, var(--err) 20%, transparent); }
.diff { font-family: ui-monospace, Consolas, monospace; font-size: 13px; white-space: pre-wrap; border-radius: 10px; padding: 10px; border: 1px solid var(--border); }

@media (max-width: 860px) {
  .sidebar {
    position: fixed; left: 0; top: 0; z-index: 50; transform: translateX(-100%);
    transition: transform .25s ease; box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: grid; place-items: center; }
  .scrim {
    position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 40;
    opacity: 0; pointer-events: none; transition: .2s;
  }
  .scrim.show { opacity: 1; pointer-events: auto; }
}

.footer { margin-top: 36px; text-align: center; color: var(--muted); font-size: 12.5px; }
.footer a { color: var(--primary); text-decoration: none; }