/* AI-ECG LVEF — stylesheet ------------------------------------------------ */
:root {
  --bg: #f6f7fb; --surface: #ffffff; --ink: #0f172a; --ink-2: #334155; --muted: #64748b; --line: #e2e8f0;
  --brand: #4f46e5; --brand-2: #7c3aed; --brand-soft: #eef2ff;
  --ok: #059669; --ok-soft: #ecfdf5; --warn: #b45309; --warn-soft: #fffbeb; --warn-line: #fcd34d;
  --bad: #dc2626; --bad-soft: #fef2f2;
  --radius: 16px; --shadow: 0 1px 2px rgba(15,23,42,.04), 0 8px 24px -12px rgba(15,23,42,.12);
  --font: Inter, ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; background: linear-gradient(180deg, #f8f9ff 0, var(--bg) 520px); color: var(--ink); font: 15px/1.6 var(--font); -webkit-font-smoothing: antialiased; }
code { font-family: var(--mono); font-size: .88em; background: #f1f5f9; padding: 1px 6px; border-radius: 6px; }
a { color: var(--brand); }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
[hidden] { display: none !important; }

/* nav */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.82); backdrop-filter: saturate(160%) blur(12px); border-bottom: 1px solid var(--line); }
.nav-in { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 700; letter-spacing: -.01em; }
.brand svg { width: 30px; height: 30px; }
.brand svg rect { fill: var(--brand); }
.brand svg path { fill: none; stroke: #fff; stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.brand em { font-style: normal; color: var(--brand); }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav-links a { color: var(--ink-2); text-decoration: none; font-weight: 500; }
.nav-links a:hover { color: var(--brand); }
.pill { font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px; }
.pill-research { background: var(--warn-soft); color: var(--warn); border: 1px solid var(--warn-line); }

/* hero */
.hero { position: relative; overflow: hidden; padding: 64px 0 40px;
  background: radial-gradient(900px 380px at 85% -10%, rgba(124,58,237,.16), transparent 60%),
              radial-gradient(700px 320px at 5% 0%, rgba(79,70,229,.14), transparent 60%); }
.hero::after { content: ""; position: absolute; inset: auto 0 0 0; height: 120px; pointer-events: none; opacity: .5;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 600 60' preserveAspectRatio='none'%3E%3Cpath d='M0 40h120l12-22 16 34 14-44 12 32h120l12-22 16 34 14-44 12 32h232' fill='none' stroke='%234f46e5' stroke-opacity='.18' stroke-width='2'/%3E%3C/svg%3E") bottom/100% 60px no-repeat; }
.eyebrow { margin: 0 0 10px; font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--brand); }
.hero h1 { margin: 0 0 16px; font-size: clamp(30px, 4.4vw, 48px); line-height: 1.1; letter-spacing: -.025em; font-weight: 800; }
.grad { background: linear-gradient(90deg, var(--brand), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 720px; margin: 0 0 22px; font-size: 17px; color: var(--ink-2); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 0; list-style: none; }
.chips li { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; font-size: 13.5px; font-weight: 500; color: var(--ink-2); box-shadow: var(--shadow); }
.chips svg { width: 16px; height: 16px; fill: none; stroke: var(--brand); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* notice */
.notice { display: flex; gap: 12px; align-items: flex-start; margin: 8px 0 24px; padding: 12px 16px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--warn); }
.notice svg { flex: none; width: 20px; height: 20px; margin-top: 2px; fill: none; stroke: var(--warn); stroke-width: 2; stroke-linecap: round; }
.notice p { margin: 0; color: var(--ink-2); font-size: 14px; }

/* layout + cards */
main { padding-bottom: 40px; }
.grid2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: stretch; }
.card { min-width: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 26px; margin-bottom: 24px; }
.grid2 > .card { margin-bottom: 0; }
.grid2 { margin-bottom: 24px; }
.card-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.card-head h2 { margin: 0; font-size: 18px; letter-spacing: -.01em; }
.card-head .badge { margin-left: auto; }
.step { display: inline-grid; place-items: center; min-width: 28px; height: 28px; padding: 0 6px; border-radius: 8px; background: var(--brand-soft); color: var(--brand); font-weight: 700; font-size: 13px; }

/* drop zone */
.drop { position: relative; display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 34px 20px; border: 2px dashed #c7d2fe; border-radius: 14px; background: linear-gradient(180deg, #fafbff, #f5f7ff); cursor: pointer; transition: .15s; text-align: center; }
.drop:hover, .drop.over { border-color: var(--brand); background: var(--brand-soft); transform: translateY(-1px); }
.drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.drop-ico { width: 44px; height: 44px; fill: none; stroke: var(--brand); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.drop-title { font-weight: 600; font-size: 16px; }
.drop-title u { color: var(--brand); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.drop-sub { font-size: 13px; color: var(--muted); }
.formats { display: grid; gap: 10px; margin-top: 16px; }
.fmt { font-size: 13.5px; color: var(--ink-2); padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: #fcfdff; }
.fmt .badge { margin-right: 6px; }

/* badges + status */
.badge { display: inline-block; font-size: 11.5px; font-weight: 700; letter-spacing: .03em; text-transform: uppercase; padding: 3px 9px; border-radius: 999px; vertical-align: middle; }
.badge-ok { background: var(--ok-soft); color: var(--ok); }
.badge-warn { background: var(--warn-soft); color: var(--warn); border: 1px solid var(--warn-line); }
.status { margin-top: 16px; padding: 10px 14px; border-radius: 10px; background: #f1f5f9; color: var(--ink-2); font-size: 14px; }
.status::before { content: "●"; margin-right: 8px; color: var(--muted); }
.status.ok::before { color: var(--ok); } .status.warn::before { color: #f59e0b; }
.status.err { background: var(--bad-soft); color: var(--bad); } .status.err::before { color: var(--bad); }
.warnings { margin: 10px 0 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.warnings li { font-size: 13.5px; padding: 8px 12px; border-radius: 10px; background: var(--warn-soft); color: #92400e; border: 1px solid #fde68a; }
.warnings li.info { background: #f1f5f9; color: var(--ink-2); border-color: var(--line); }

/* result */
.empty { display: grid; place-items: center; text-align: center; min-height: 260px; color: var(--muted); border: 1px dashed var(--line); border-radius: 14px; background: #fbfcfe; }
.empty svg { width: 140px; height: 46px; fill: none; stroke: #c7d2fe; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.empty p { margin: 0; max-width: 260px; font-size: 14px; }
#modeBadge { margin-bottom: 12px; }
.verdict { display: flex; gap: 16px; align-items: flex-start; padding: 18px 20px; border-radius: 14px; margin-bottom: 18px; border: 1px solid var(--line); }
.verdict.pos { background: linear-gradient(135deg, #fff1f2, #fef2f2); border-color: #fecaca; }
.verdict.neg { background: linear-gradient(135deg, #ecfdf5, #f0fdf4); border-color: #bbf7d0; }
.verdict.img { outline: 2px dashed #f59e0b; outline-offset: 3px; }
.bars { display: grid; gap: 12px; }
.bar { display: grid; grid-template-columns: 130px 1fr 58px; gap: 12px; align-items: center; font-size: 14px; }
.lab i { font-style: normal; font-size: 11px; color: var(--brand); background: var(--brand-soft); padding: 1px 6px; border-radius: 6px; margin-left: 4px; }
.track { position: relative; height: 10px; border-radius: 999px; background: #eef2f7; overflow: visible; }
.fill { height: 100%; width: 0; border-radius: 999px; background: linear-gradient(90deg, var(--brand), var(--brand-2)); transition: width .6s cubic-bezier(.2,.8,.2,1); }
.thr { position: absolute; top: -5px; width: 2px; height: 20px; background: var(--ink); border-radius: 2px; }
.val { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }

/* image mode */
.imgwarn { display: flex; gap: 14px; padding: 16px 18px; margin-bottom: 18px; border-radius: 14px; background: var(--warn-soft); border: 1px solid var(--warn-line); }
.imgwarn svg { flex: none; width: 26px; height: 26px; fill: none; stroke: var(--warn); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.imgwarn strong { color: #92400e; }
.imgwarn p { margin: 6px 0 0; font-size: 14px; color: #78350f; }
.imgctl { display: flex; flex-wrap: wrap; gap: 14px 18px; align-items: flex-end; margin-bottom: 10px; }
.imgctl label { display: flex; flex-direction: column; gap: 5px; font-size: 12.5px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.imgctl select { font: 500 14px var(--font); color: var(--ink); text-transform: none; letter-spacing: 0; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); min-width: 190px; }
.imgbtns { margin-left: auto; display: flex; gap: 10px; }
.btn { font: 600 14px var(--font); padding: 10px 18px; border-radius: 10px; cursor: pointer; border: 1px solid transparent; transition: .15s; }
.btn-primary { background: linear-gradient(90deg, var(--brand), var(--brand-2)); color: #fff; box-shadow: 0 6px 16px -6px rgba(79,70,229,.6); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { background: var(--surface); color: var(--ink-2); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.hint { font-size: 13.5px; color: var(--muted); margin: 6px 0 14px; }
.canvas-frame { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #fff; }
#imgCanvas { width: 100%; display: block; cursor: crosshair; touch-action: none; }
#ecg { width: 100%; height: auto; display: block; }

/* model + validation */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 0; }
.stats div { padding: 18px; border-radius: 14px; background: linear-gradient(135deg, #eef2ff, #f5f3ff); border: 1px solid #e0e7ff; }
.stats dt { font-size: 28px; font-weight: 800; color: var(--brand); letter-spacing: -.02em; }
.stats dd { margin: 2px 0 0; font-size: 13px; color: var(--ink-2); line-height: 1.35; }
.stats small { color: var(--muted); }
.list { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 14px; }
.list li { margin-bottom: 6px; }
#imgvalBody p { font-size: 14px; color: var(--ink-2); margin: 0 0 12px; }
#imgvalBody .small { font-size: 12.5px; color: var(--muted); }
.tbl-wrap { overflow-x: auto; margin: 6px 0 12px; border: 1px solid var(--line); border-radius: 12px; }
table.val { width: 100%; min-width: 820px; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
table.val th { background: #f8fafc; font-weight: 600; color: var(--muted); text-align: right; padding: 9px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.val td { padding: 8px 10px; border-bottom: 1px solid #f1f5f9; text-align: right; }
table.val th:first-child, table.val td:first-child { text-align: left; }
table.val tr:last-child td { border-bottom: 0; }
table.val tr.ref td { background: #f8fffb; font-weight: 600; }
.auc-bar { display: inline-block; height: 6px; border-radius: 4px; background: linear-gradient(90deg, var(--brand), var(--brand-2)); vertical-align: middle; margin-right: 6px; }

/* footer */
.footer { border-top: 1px solid var(--line); background: var(--surface); padding: 22px 0; font-size: 13px; color: var(--muted); }
.footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

/* sections */
.section-title { font-size: 22px; letter-spacing: -.02em; margin: 8px 0 16px; }
.how { margin: 8px 0 28px; }
.how-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.how-step { position: relative; padding: 22px 22px 20px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s; }
.how-step:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -14px rgba(79,70,229,.35); }
.how-n { display: inline-block; font-size: 13px; font-weight: 800; letter-spacing: .06em; background: linear-gradient(90deg, var(--brand), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.how-step h3 { margin: 6px 0 6px; font-size: 16px; }
.how-step p { margin: 0; font-size: 14px; color: var(--ink-2); }
.card.wide { padding: 28px; }
.model-grid { display: grid; gap: 20px; }
.model-grid .list { columns: 2; column-gap: 36px; }
.model-grid .list li { break-inside: avoid; }
#imgvalBody { min-width: 0; }
.card-head h2 { font-size: 19px; }

@media (max-width: 900px) {
  .how-grid { grid-template-columns: 1fr; }
  .model-grid .list { columns: 1; }
  .grid2 { grid-template-columns: 1fr; }
  .nav-links a { display: none; }
  .stats { grid-template-columns: 1fr; }
  .bar { grid-template-columns: 100px 1fr 52px; }
  .imgbtns { margin-left: 0; }
}

/* result panel v2 */
.verdict.border { background: linear-gradient(135deg, #fffbeb, #fef9ec); border-color: #fde68a; }
.verdict-icon { flex: none; display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; background: #fff; box-shadow: 0 1px 2px rgba(15,23,42,.06); }
.verdict-icon svg { width: 26px; height: 26px; fill: none; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.verdict.pos .verdict-icon svg { stroke: var(--bad); } .verdict.neg .verdict-icon svg { stroke: var(--ok); } .verdict.border .verdict-icon svg { stroke: #d97706; }
.verdict-label { display: inline-block; font-size: 11.5px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; padding: 2px 8px; border-radius: 6px; margin-bottom: 4px; }
.verdict.pos .verdict-label { background: #fee2e2; color: #b91c1c; } .verdict.neg .verdict-label { background: #d1fae5; color: #047857; } .verdict.border .verdict-label { background: #fef3c7; color: #92400e; }
.verdict-body { min-width: 0; }
.verdict-body b { display: block; font-size: 17px; line-height: 1.3; color: var(--ink); }
.verdict-body p { margin: 4px 0 0; color: var(--ink-2); font-size: 14px; }
.meter { padding: 16px 18px 12px; border: 1px solid var(--line); border-radius: 14px; background: #fcfdff; }
.meter-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 26px; }
.meter-head span { font-size: 12.5px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
.meter-head b { font-size: 30px; font-weight: 800; letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1; }
.meter-head b.pos { color: var(--bad); } .meter-head b.neg { color: var(--ok); } .meter-head b.border { color: #d97706; }
.meter-track { position: relative; height: 12px; border-radius: 999px; background: #eef2f7; }
.zone { position: absolute; top: 0; height: 100%; }
.zone-neg { left: 0; background: #a7f3d0; border-radius: 999px 0 0 999px; } .zone-border { background: #fde68a; } .zone-pos { background: #fecaca; border-radius: 0 999px 999px 0; }
.meter-thr { position: absolute; top: -6px; width: 2px; height: 24px; margin-left: -1px; background: var(--ink); border-radius: 2px; }
.meter-thr span { position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); font-size: 11px; font-weight: 600; color: var(--ink-2); white-space: nowrap; background: #fff; padding: 1px 6px; border-radius: 6px; border: 1px solid var(--line); }
.meter-pin { position: absolute; top: 50%; width: 22px; height: 22px; margin: -11px 0 0 -11px; border-radius: 50%; background: #fff; border: 4px solid var(--ink); box-shadow: 0 2px 6px rgba(15,23,42,.25); transition: left .6s cubic-bezier(.2,.8,.2,1); }
.meter-pin.pos { border-color: var(--bad); } .meter-pin.neg { border-color: var(--ok); } .meter-pin.border { border-color: #d97706; }
.meter-scale { display: flex; justify-content: space-between; margin-top: 8px; font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.meter-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 8px; font-size: 12px; color: var(--ink-2); }
.lg::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.lg-neg::before { background: #a7f3d0; } .lg-border::before { background: #fde68a; } .lg-pos::before { background: #fecaca; }
.lg-note { margin-left: auto; color: var(--muted); font-style: italic; }
.why { margin: 14px 0 0; padding: 12px 14px; font-size: 13px; line-height: 1.55; color: var(--ink-2); background: #f8fafc; border: 1px solid var(--line); border-radius: 12px; }
.outputs { margin-top: 16px; }
.outputs-title { display: block; font-size: 12.5px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.bar { grid-template-columns: 132px minmax(0, 1fr) 58px; }