:root {
    --line: #e2e5ea;
    --ink: #1f2430;
    --muted: #6b7280;
    --accent: #2563eb;
    --ok: #15803d;
    --warn: #b45309;
    --bad: #b91c1c;
    --bg: #f6f7f9;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font: 14px/1.55 "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: var(--bg);
}

.topbar {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 10px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 5;
}

.brand { font-weight: 700; letter-spacing: .3px; }

.nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }

.nav a {
    padding: 6px 12px;
    border-radius: 6px;
    color: var(--muted);
    text-decoration: none;
}

.nav a.active { background: #eef2ff; color: var(--accent); font-weight: 600; }

.session { color: var(--muted); display: flex; align-items: center; gap: 10px; }

.view { padding: 20px; max-width: 1240px; margin: 0 auto; }

.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 16px 18px;
    margin-bottom: 18px;
}

.card > h2 { margin: 0 0 12px; font-size: 16px; }
.card > h3 { margin: 18px 0 8px; font-size: 14px; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; background: #fafbfc; }
tbody tr:hover { background: #f9fbff; }

button, .btn {
    font: inherit;
    padding: 5px 11px;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: #fff;
    cursor: pointer;
}

button:hover { border-color: var(--accent); color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.ghost { border-style: dashed; }
button:disabled { opacity: .5; cursor: not-allowed; }

input, select, textarea {
    font: inherit;
    padding: 6px 9px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    color: var(--ink);
}

textarea { width: 100%; min-height: 64px; }

.form-grid { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 12px; color: var(--muted); }

.row-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.muted { color: var(--muted); }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; border: 1px solid var(--line); }
.tag.ok { color: var(--ok); border-color: #bbf7d0; background: #f0fdf4; }
.tag.warn { color: var(--warn); border-color: #fde68a; background: #fffbeb; }
.tag.bad { color: var(--bad); border-color: #fecaca; background: #fef2f2; }
.tag.info { color: var(--accent); border-color: #bfdbfe; background: #eff6ff; }
.tag.gray { color: var(--muted); }

pre.json {
    background: #0f172a;
    color: #e2e8f0;
    padding: 12px 14px;
    border-radius: 8px;
    overflow: auto;
    font-size: 12.5px;
    margin: 0;
}

.people { display: flex; flex-wrap: wrap; gap: 8px 16px; max-height: 190px; overflow: auto; padding: 8px; border: 1px solid var(--line); border-radius: 8px; }
.people label { display: flex; align-items: center; gap: 6px; }

.flow { display: flex; flex-direction: column; gap: 6px; }
.flow .node { border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; background: #fff; }
.flow .node .head { display: flex; gap: 10px; align-items: center; font-weight: 600; }
.flow .arrow { color: var(--muted); padding-left: 18px; }

.toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, .38);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 20;
}

.modal { background: #fff; border-radius: 10px; padding: 18px; width: min(560px, 92vw); max-height: 88vh; overflow: auto; }
.modal h3 { margin-top: 0; }
.modal .actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }

.toast {
    position: fixed;
    right: 20px;
    bottom: 20px;
    background: #111827;
    color: #fff;
    padding: 10px 14px;
    border-radius: 8px;
    max-width: 460px;
    z-index: 40;
}

.toast.err { background: var(--bad); }

.empty { padding: 26px; text-align: center; color: var(--muted); }