:root {
  --bg: #0b1020; --panel: #131a2e; --panel2: #1b2440; --border: #2a3552;
  --text: #e2e8f0; --muted: #94a3b8; --accent: #6366f1; --accent2: #818cf8;
  --ok: #34d399; --bad: #f87171;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.muted { color: var(--muted); } .small { font-size: 12px; }
button { cursor: pointer; border: 1px solid var(--accent); background: var(--accent); color: #fff; border-radius: 8px; padding: 8px 14px; font-size: 14px; }
button:hover { background: var(--accent2); }
button.ghost { background: transparent; color: var(--text); border-color: var(--border); }
button.ghost:hover { background: var(--panel2); }
input, textarea { background: var(--panel2); border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 9px 12px; font-size: 14px; font-family: inherit; }
textarea { resize: vertical; width: 100%; }
code { background: var(--panel2); padding: 1px 5px; border-radius: 4px; font-size: 12px; }

/* login */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 32px; width: 320px; display: flex; flex-direction: column; gap: 12px; }
.login-card h1 { margin: 0; font-size: 24px; }
.login-card p { margin: 0 0 8px; }

/* header */
header { display: flex; justify-content: space-between; align-items: center; padding: 12px 20px; border-bottom: 1px solid var(--border); background: var(--panel); }
.brand { font-size: 18px; font-weight: 600; }
.header-right { display: flex; align-items: center; gap: 12px; }

/* layout */
.layout { display: grid; grid-template-columns: 320px 1fr; height: calc(100vh - 57px); }
.sidebar { border-right: 1px solid var(--border); background: var(--panel); overflow-y: auto; padding: 12px; }
main { overflow-y: auto; padding: 20px 28px; }

/* tabs */
.tabs { display: flex; gap: 6px; margin-bottom: 10px; }
.tab { background: transparent; border: 1px solid var(--border); color: var(--muted); padding: 6px 12px; }
.tab.active { color: #fff; border-color: var(--accent); background: var(--panel2); }
.filter { width: 100%; margin-bottom: 8px; }

/* schema tree */
.tree details { margin: 2px 0; }
.tree summary { cursor: pointer; padding: 3px 0; }
.sch > summary { font-weight: 600; }
.sdesc, .tdesc { margin: 2px 0 6px 14px; }
.tbl { margin-left: 12px; }
.col { margin: 3px 0 6px 22px; }
.cdesc { margin-left: 0; }

/* ask */
.ask { display: flex; gap: 10px; align-items: flex-start; }
.ask textarea { flex: 1; }
.ask button { padding: 10px 22px; height: 100%; }
.examples { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 4px; }
.chip { cursor: pointer; background: var(--panel2); border: 1px solid var(--border); border-radius: 16px; padding: 5px 12px; font-size: 12px; color: var(--muted); }
.chip:hover { color: #fff; border-color: var(--accent); }

/* status / error / result */
.status { margin: 16px 0; color: var(--muted); }
.error { margin: 12px 0; color: var(--bad); background: rgba(248,113,113,.08); border: 1px solid rgba(248,113,113,.3); border-radius: 8px; padding: 10px 12px; }
#result { margin-top: 18px; }
.answer { font-size: 16px; line-height: 1.6; margin-bottom: 14px; }
.assumptions { background: rgba(99,102,241,.07); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 8px; padding: 10px 14px; margin-bottom: 14px; }
.assumptions .atitle { font-weight: 600; font-size: 13px; margin-bottom: 4px; color: var(--accent2); }
.assumptions ul { margin: 0; padding-left: 18px; }
.assumptions li { margin: 2px 0; font-size: 13px; }
.step { padding: 6px 0; border-bottom: 1px solid var(--border); }
.step code { display: block; white-space: pre-wrap; font-size: 12px; margin-bottom: 2px; }
.step.bad code { color: var(--bad); }
.result-actions { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.sqlbox { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-bottom: 14px; }
.sqlbox summary { cursor: pointer; margin-bottom: 8px; }
.sqlbox textarea { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 13px; margin-bottom: 8px; }
.chartwrap { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin-bottom: 14px; max-height: 420px; }

/* table */
.tablewrap { overflow: auto; border: 1px solid var(--border); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { text-align: left; padding: 7px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { background: var(--panel2); position: sticky; top: 0; }
tbody tr:hover { background: var(--panel2); }
.null { color: var(--muted); }

/* history / saved */
.hitem, .sitem { padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 8px; cursor: pointer; }
.hitem:hover, .sitem:hover { border-color: var(--accent); }
.hitem.bad { border-left: 3px solid var(--bad); }
.hq { font-weight: 500; margin-bottom: 3px; }
.srow { display: flex; gap: 6px; margin-top: 6px; }
.srow button { padding: 4px 10px; font-size: 12px; }