:root {
      --bg:       #FFFFFF;
      --bg2:      #F7F7F5;
      --bg3:      #EFEFEC;
      --border:   #E4E4E0;
      --text:     #111110;
      --text2:    #3C3C3A;
      --muted:    #888885;

      --qs-bg:     #ECFEFF;
      --qs-border: #0891B2;
      --qs-text:   #0E7490;
      --qs-soft:   #cffafe;

      --tag-green-bg:  #ECFDF5; --tag-green:  #059669;
      --tag-blue-bg:   #EFF6FF; --tag-blue:   #2563EB;
      --tag-purple-bg: #F5F3FF; --tag-purple: #7C3AED;
      --tag-amber-bg:  #FFFBEB; --tag-amber:  #D97706;
      --tag-red-bg:    #FEF2F2; --tag-red:    #DC2626;
      --tag-cyan-bg:   #ECFEFF; --tag-cyan:   #0891B2;

      --warn-bg: #FFFBEB; --warn-bd: #fde68a; --warn-tx: #B45309;
      --crit-bg: #FEF2F2; --crit-bd: #fecaca; --crit-tx: #DC2626;

      --r: 6px; --r-sm: 4px; --r-lg: 10px;
      --f: 'Geist', -apple-system, 'Segoe UI', Verdana, sans-serif;
      --fm: 'Geist Mono', 'Consolas', monospace;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body { font-family: var(--f); background: var(--bg); color: var(--text); line-height: 1.6; -webkit-font-smoothing: antialiased; }
    a { color: inherit; text-decoration: none; }

    .wrap { max-width: 1180px; margin: 0 auto; padding: 0 1.75rem; }

    /* ── NAV ── */
    header { position: sticky; top: 0; z-index: 300; background: rgba(255,255,255,.94); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
    nav { display: flex; align-items: center; justify-content: space-between; height: 52px; }
    .logo { font-family: var(--f); font-size: 1rem; font-weight: 700; letter-spacing: -.03em; color: var(--text); display: flex; align-items: center; gap: .4rem; line-height: 1; }
    .logo svg { flex-shrink: 0; display: block; }
    .logo-name { color: var(--qs-text); background: var(--qs-bg); border: 1px solid var(--qs-soft); padding: .08rem .35rem; border-radius: 4px; font-weight: 600; font-size: .95rem; }
    .logo-by { font-size: .78rem; font-weight: 400; color: var(--muted); }
    .nav-mid { display: flex; gap: 1.6rem; }
    .nav-mid a { font-size: .82rem; color: var(--muted); transition: color .15s; }
    .nav-mid a:hover { color: var(--text); }
    .btn { display: inline-flex; align-items: center; gap: .35rem; padding: .42rem .9rem; border-radius: var(--r); font-size: .82rem; font-weight: 500; cursor: pointer; border: none; transition: all .15s; font-family: var(--f); }
    .btn-ghost { background: transparent; color: var(--text2); border: 1px solid var(--border); }
    .btn-ghost:hover { background: var(--bg2); border-color: #ccc; }
    .btn-solid { background: var(--text); color: #fff; }
    .btn-solid:hover { background: #333; }
    .btn-qs { background: var(--qs-text); color: #fff; }
    .btn-qs:hover { background: #0b6275; }

    .tag { display: inline-flex; align-items: center; gap: .3rem; padding: .2rem .55rem; border-radius: 100px; font-size: .72rem; font-weight: 500; font-family: var(--fm); border: 1px solid transparent; white-space: nowrap; }
    .tag-cyan { background: var(--tag-cyan-bg); color: var(--tag-cyan); border-color: #a5f3fc; }
    .tag-green { background: var(--tag-green-bg); color: var(--tag-green); border-color: #a7f3d0; }

    /* ── HERO ── */
    .hero { padding: 3.2rem 0 1.5rem; text-align: center; }
    .qs-badge { display: inline-flex; align-items: center; gap: .35rem; font-family: var(--fm); font-size: .7rem; font-weight: 500; padding: .22rem .6rem; border-radius: 100px; background: var(--qs-bg); color: var(--qs-text); border: 1px solid var(--qs-soft); margin-bottom: 1rem; }
    .hero h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 700; letter-spacing: -.04em; line-height: 1.08; margin-bottom: .8rem; }
    .hero h1 .em { color: var(--qs-text); }
    .hero h1 .engine { font-weight: 700; color: #2563EB; }
    .hero h1 .caret { display: inline-block; width: 3px; height: .92em; background: #2563EB; margin-left: 3px; vertical-align: -2px; border-radius: 1px; animation: blink 1s step-end infinite; }
    @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
    .hero-sub { transition: opacity .3s ease; min-height: 2.8em; }
    .hero-sub code { font-family: var(--fm); font-size: .85em; background: var(--bg2); border: 1px solid var(--border); border-radius: 4px; padding: .05rem .3rem; }
    .hero-sub { font-size: 1rem; color: var(--text2); max-width: 60ch; margin: 0 auto; }
    .privacy { margin-top: 1rem; font-size: .78rem; color: var(--muted); font-family: var(--fm); display: inline-flex; align-items: center; gap: .4rem; }

    section { padding: 1.5rem 0; }

    /* ── INPUT ── */
    .input-card { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 1.25rem; }
    .engine-sel { display: flex; gap: .5rem; margin-bottom: 1rem; flex-wrap: wrap; align-items: center; }
    .engine-sel .eng-label { font-family: var(--fm); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-right: .15rem; }
    .engine-sel .eng { display: inline-flex; align-items: center; gap: .45rem; min-height: 34px; font-family: var(--f); font-size: .82rem; font-weight: 500; padding: .36rem .85rem .36rem .48rem; border: 1px solid var(--border); background: var(--bg); color: var(--text2); border-radius: 100px; cursor: pointer; transition: border-color .15s, color .15s, background .15s; white-space: nowrap; }
    .engine-sel .eng:hover { border-color: #c4c4c0; color: var(--text); }
    .engine-sel .eng.active { color: #fff; border-color: transparent; }
    .engine-sel .eng.active[data-engine="sqlserver"] { background: #2563EB; }
    .engine-sel .eng.active[data-engine="mysql"]     { background: #D97706; }
    .engine-sel .eng.active[data-engine="postgres"]  { background: #336791; }
    .engine-sel .eng.active[data-engine="mongo"]     { background: #059669; }
    .engine-sel .eng-logo { width: 20px; height: 20px; display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; }
    .engine-sel .eng-logo img { width: 19px; height: 19px; display: block; object-fit: contain; }
    .engine-sel .eng[data-engine="sqlserver"] .eng-logo img { width: 20px; height: 20px; }
    .engine-sel .eng[data-engine="postgres"] .eng-logo img { width: 18px; height: 18px; }
    .engine-sel .eng .soon { font-family: var(--fm); font-size: .56rem; font-weight: 500; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); background: var(--bg3); border-radius: 100px; padding: .08rem .35rem; }
    .engine-sel .eng.active .soon { color: #fff; background: rgba(255,255,255,.22); }
    .coming-soon { text-align: center; padding: 3rem 1.25rem; }
    .coming-soon .cs-eng { font-size: 1.1rem; font-weight: 600; color: var(--text); margin-bottom: .35rem; }
    .coming-soon .cs-msg { font-size: .88rem; color: var(--muted); max-width: 46ch; margin: 0 auto .9rem; }
    .coming-soon .cs-cta { display: inline-flex; align-items: center; gap: .4rem; font-size: .82rem; font-weight: 500; color: var(--qs-text); background: var(--qs-bg); border: 1px solid var(--qs-soft); border-radius: var(--r); padding: .45rem .9rem; cursor: pointer; }
    .drop { border: 2px dashed var(--border); border-radius: var(--r); background: var(--bg); transition: all .15s; }
    .drop.drag { border-color: var(--qs-border); background: var(--qs-bg); }
    textarea#src { width: 100%; min-height: 150px; resize: vertical; border: none; background: transparent; padding: 1rem; font-family: var(--fm); font-size: .78rem; line-height: 1.55; color: var(--text); outline: none; }
    .input-actions { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; margin-top: .9rem; }
    .input-hint { font-size: .76rem; color: var(--muted); margin-left: auto; }
    .file-in { display: none; }
    .parse-err { margin-top: .8rem; font-size: .82rem; color: var(--crit-tx); background: var(--crit-bg); border: 1px solid var(--crit-bd); border-radius: var(--r); padding: .6rem .8rem; display: none; }

    /* ── TABS ── */
    .tabs { display: flex; gap: .3rem; border-bottom: 1px solid var(--border); margin: 1.75rem 0 1.25rem; }
    .tab { padding: .6rem 1rem; font-size: .85rem; font-weight: 500; color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; display: inline-flex; align-items: center; gap: .45rem; transition: color .15s; background: none; border-top: none; border-left: none; border-right: none; font-family: var(--f); }
    .tab:hover { color: var(--text); }
    .tab.active { color: var(--qs-text); border-bottom-color: var(--qs-text); }
    .tab .cnt { font-family: var(--fm); font-size: .68rem; background: var(--bg3); color: var(--muted); padding: 0 .35rem; border-radius: 100px; }
    .tab.active .cnt { background: var(--qs-bg); color: var(--qs-text); }
    .pane { display: none; }
    .pane.active { display: block; }

    .empty { text-align: center; padding: 3.5rem 1rem; color: var(--muted); font-size: .9rem; }

    /* ── WARNINGS ── */
    .findings { display: grid; gap: .5rem; margin-bottom: 1.25rem; }
    .finding { display: flex; gap: .7rem; align-items: flex-start; padding: .7rem .9rem; border-radius: var(--r); border: 1px solid; font-size: .83rem; cursor: pointer; }
    .finding.crit { background: var(--crit-bg); border-color: var(--crit-bd); }
    .finding.warn { background: var(--warn-bg); border-color: var(--warn-bd); }
    .finding.info { background: var(--bg2); border-color: var(--border); }
    .finding .ic { flex-shrink: 0; display: flex; align-items: center; padding-top: .05rem; }
    .finding.crit .ic { color: var(--crit-tx); }
    .finding.warn .ic { color: var(--warn-tx); }
    .finding.info .ic { color: var(--muted); }
    .finding .ft strong { display: block; font-weight: 600; color: var(--text); margin-bottom: .1rem; }
    .finding .ft span { color: var(--text2); }
    .finding .nid { font-family: var(--fm); font-size: .68rem; color: var(--muted); margin-left: auto; white-space: nowrap; }
    .finding .ft { min-width: 0; }
    .finding-sql { font-family: var(--fm); font-size: .72rem; line-height: 1.5; white-space: pre-wrap; word-break: break-word; background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-sm); padding: .55rem .65rem; margin: .55rem 0 .45rem; color: var(--text); overflow-x: auto; }
    .copy-sql { font-family: var(--f); font-size: .72rem; font-weight: 500; padding: .28rem .65rem; border: 1px solid var(--border); border-radius: var(--r-sm); background: var(--bg); color: var(--text2); cursor: pointer; transition: background .15s; }
    .copy-sql:hover { background: var(--bg2); border-color: #ccc; }

    .stmt-head { display: flex; align-items: baseline; gap: .75rem; flex-wrap: wrap; margin-bottom: .6rem; }
    .stmt-head h3 { font-size: .95rem; font-weight: 600; }
    .stmt-head .cost { font-family: var(--fm); font-size: .76rem; color: var(--muted); }
    .stmt-sql { font-family: var(--fm); font-size: .72rem; color: var(--text2); background: var(--bg2); border: 1px solid var(--border); border-radius: var(--r); padding: .7rem .85rem; white-space: pre-wrap; word-break: break-word; max-height: 130px; overflow: auto; margin-bottom: 1rem; }

    /* ── PLAN DIAGRAM ── */
    .plan-wrap { display: grid; grid-template-columns: 1fr 300px; gap: 1rem; }
    @media (max-width: 900px){ .plan-wrap { grid-template-columns: 1fr; } }
    .diagram-box { border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--bg2); position: relative; overflow: hidden; }
    .diagram-tools { display: flex; align-items: center; justify-content: flex-end; gap: .3rem; padding: .55rem .65rem; border-bottom: 1px solid var(--border); background: rgba(255,255,255,.9); }
    .ztool { width: 28px; height: 28px; border-radius: var(--r-sm); border: 1px solid var(--border); background: var(--bg); color: var(--text2); cursor: pointer; font-size: .9rem; display: flex; align-items: center; justify-content: center; line-height: 1; }
    .ztool:hover { background: var(--bg2); color: var(--text); }
    .zslider { width: 92px; accent-color: var(--qs-text); cursor: pointer; }
    .diagram-scroll { overflow: auto; height: min(620px, var(--diagram-h, 620px)); padding: 2rem 1.5rem 1.5rem; cursor: grab; overscroll-behavior: contain; }
    .diagram-scroll.panning { cursor: grabbing; }
    .canvas { position: relative; transform-origin: 0 0; }
    .canvas svg.links { position: absolute; top: 0; left: 0; overflow: visible; pointer-events: none; }
    .flow-edge { stroke: #9aa0a6; opacity: .82; }
    .pnode { position: absolute; width: 168px; background: var(--bg); border: 1px solid var(--border); border-left: 3px solid var(--muted); border-radius: var(--r); padding: .5rem .6rem; cursor: pointer; box-shadow: 0 1px 2px rgba(0,0,0,.04); transition: box-shadow .12s, transform .12s, background .12s, border-color .12s; }
    .pnode.heat-mild { background: #fef9c3; border-color: #eab308; border-left-color: #eab308; }
    .pnode.heat-warm { background: #ffedd5; border-color: #f97316; border-left-color: #f97316; }
    .pnode.heat-hot { background: #fee2e2; border-color: #dc2626; border-left-color: #dc2626; }
    .pnode.sev-warn { box-shadow: 0 0 0 1px rgba(217,119,6,.18), 0 1px 2px rgba(0,0,0,.04); }
    .pnode.sev-crit { box-shadow: 0 0 0 1px rgba(220,38,38,.22), 0 1px 2px rgba(0,0,0,.04); }
    .pnode:hover { box-shadow: 0 4px 14px -4px rgba(0,0,0,.18); }
    .pnode.sel { box-shadow: 0 0 0 2px rgba(17,17,16,.22), 0 6px 18px -8px rgba(0,0,0,.22); }
    .pnode .pn-top { display: flex; align-items: center; gap: .4rem; }
    .pnode .pn-ic { width: 22px; height: 22px; flex-shrink: 0; color: var(--text2); }
    .pnode .pn-name { font-size: .72rem; font-weight: 600; line-height: 1.15; letter-spacing: -.01em; }
    .pnode .pn-obj { font-family: var(--fm); font-size: .62rem; color: var(--muted); margin-top: .15rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .pnode .pn-meta { display: flex; justify-content: space-between; align-items: center; margin-top: .35rem; font-family: var(--fm); font-size: .62rem; color: var(--text2); }
    .pnode .pn-cost { color: var(--qs-text); font-weight: 500; }
    .pnode .costbar { height: 3px; border-radius: 2px; background: var(--bg3); margin-top: .3rem; overflow: hidden; }
    .pnode .costbar i { display: block; height: 100%; background: var(--qs-text); }
    .pnode .pn-warn { position: absolute; top: -7px; right: -7px; width: 17px; height: 17px; border-radius: 50%; background: var(--warn-tx); color: #fff; font-size: .62rem; display: flex; align-items: center; justify-content: center; font-weight: 700; }
    .pnode .pn-warn.crit { background: var(--crit-tx); }
    .diagram-tip { position: absolute; z-index: 50; width: max-content; max-width: 320px; padding: .45rem .55rem; border-radius: var(--r-sm); background: #111110; color: #fff; font-size: .7rem; line-height: 1.35; font-weight: 500; box-shadow: 0 8px 24px rgba(0,0,0,.18); opacity: 0; transform: translateY(-100%) translateY(-4px); pointer-events: none; transition: opacity .12s, transform .12s; }
    .diagram-tip.show { opacity: 1; transform: translateY(-100%) translateY(0); }
    .diagram-tip.below { transform: translateY(4px); }
    .diagram-tip.below.show { transform: translateY(0); }
    .arrow-lbl { position: absolute; font-family: var(--fm); font-size: .6rem; color: var(--text2); background: rgba(247,247,245,.85); padding: 0 .2rem; border-radius: 2px; transform: translate(-50%,-50%); white-space: nowrap; pointer-events: none; }

    /* ── PROPERTY PANEL ── */
    .props { border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--bg); padding: 1rem; align-self: start; position: sticky; top: 64px; max-height: 660px; overflow: auto; }
    .props h4 { font-size: .9rem; font-weight: 600; margin-bottom: .15rem; display: flex; align-items: center; gap: .4rem; }
    .props .sub { font-family: var(--fm); font-size: .68rem; color: var(--muted); margin-bottom: .8rem; }
    .prow { display: grid; grid-template-columns: 1fr auto; gap: .5rem; padding: .35rem 0; border-bottom: 1px solid var(--bg3); font-size: .76rem; }
    .prow .k { color: var(--muted); }
    .prow .v { font-family: var(--fm); text-align: right; color: var(--text); word-break: break-word; }
    .prow .v.bad { color: var(--crit-tx); font-weight: 600; }
    .prow .v.good { color: var(--tag-green); }
    .pgroup { font-family: var(--fm); font-size: .64rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: .9rem 0 .25rem; }
    .pcode { font-family: var(--fm); font-size: .68rem; color: var(--text2); background: var(--bg2); border: 1px solid var(--border); border-radius: var(--r-sm); padding: .45rem .55rem; white-space: pre-wrap; word-break: break-word; margin-top: .3rem; }
    .props .placeholder { color: var(--muted); font-size: .82rem; text-align: center; padding: 2rem 0; }

    .legend { display: flex; gap: 1rem; flex-wrap: wrap; font-size: .72rem; color: var(--muted); margin-top: .8rem; font-family: var(--fm); }
    .legend span { display: inline-flex; align-items: center; gap: .35rem; }

    /* ── STATS ── */
    .stat-cards { display: grid; grid-template-columns: repeat(auto-fit,minmax(150px,1fr)); gap: .8rem; margin-bottom: 1.5rem; }
    .stat-card { border: 1px solid var(--border); border-radius: var(--r-lg); padding: 1rem 1.1rem; background: var(--bg2); }
    .stat-card .lbl { font-family: var(--fm); font-size: .66rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: .4rem; }
    .stat-card .big { font-size: 1.5rem; font-weight: 700; letter-spacing: -.02em; }
    .stat-card .big .u { font-size: .8rem; font-weight: 500; color: var(--muted); }
    .stat-card .sub { font-size: .72rem; color: var(--muted); margin-top: .2rem; }

    .iotable { width: 100%; border-collapse: collapse; font-size: .8rem; }
    .iotable th { text-align: left; font-family: var(--fm); font-size: .66rem; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); padding: .5rem .6rem; border-bottom: 1px solid var(--border); cursor: pointer; user-select: none; white-space: nowrap; }
    .iotable th.num { text-align: right; }
    .iotable td { padding: .5rem .6rem; border-bottom: 1px solid var(--bg3); }
    .iotable td.num { text-align: right; font-family: var(--fm); }
    .iotable td.tname { font-family: var(--fm); font-weight: 600; }
    .iobar-cell { position: relative; min-width: 160px; }
    .iobar { position: relative; height: 18px; border-radius: 3px; background: var(--bg3); overflow: hidden; }
    .iobar i { display: block; height: 100%; background: linear-gradient(90deg,#0891B2,#0E7490); }
    .iobar.hot i { background: linear-gradient(90deg,#f97316,#dc2626); }
    .iotable tr.hot td.tname { color: var(--crit-tx); }
    .reads-note { font-size: .76rem; color: var(--muted); margin-top: .9rem; }

    /* ── FOOTER ── */
    footer { padding: 2.5rem 0 2rem; border-top: 1px solid var(--border); background: var(--bg2); margin-top: 3rem; }
    .foot-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border); }
    .foot-brand { font-size: .95rem; font-weight: 700; letter-spacing: -.03em; }
    .foot-tagline { font-size: .78rem; color: var(--muted); margin-top: .3rem; }
    .foot-cols { display: flex; gap: 3rem; }
    .foot-col h4 { font-family: var(--fm); font-size: .62rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: .7rem; }
    .foot-col a { display: block; font-size: .82rem; color: var(--text2); margin-bottom: .4rem; }
    .foot-col a:hover { color: var(--text); }
    .foot-bottom { padding-top: 1.25rem; font-size: .75rem; color: var(--muted); }