/* style.css — shared styles for the Quantum Circuit Tensor-Network Contraction Visualizer */
:root {
  --bg: #f1f5f9; --panel: #ffffff; --ink: #0f172a; --muted: #64748b; --line: #e2e8f0;
  --accent: #2563eb; --accent-2: #7c3aed; --ok: #15803d; --warn: #b45309; --err: #b91c1c;
  --radius: 10px; --mono: Consolas, "Cascadia Code", ui-monospace, Menlo, monospace;
  --sans: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); font-size: 14px; line-height: 1.45; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre, textarea { font-family: var(--mono); }
code { background: #eef2ff; padding: 0 4px; border-radius: 4px; font-size: 0.92em; }
.muted { color: var(--muted); }
.ok { color: var(--ok); } .warn { color: var(--warn); } .err { color: var(--err); }

/* ---------- header / nav ---------- */
.site-header { display: flex; align-items: center; gap: 24px; padding: 0 20px; height: 54px; background: #0f172a; color: #e2e8f0; position: sticky; top: 0; z-index: 50; }
.site-header .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; color: #fff; letter-spacing: .2px; }
.site-header .brand svg { flex: none; }
.site-header nav { display: flex; gap: 4px; margin-left: auto; }
.site-header nav a { color: #cbd5e1; padding: 7px 12px; border-radius: 7px; font-weight: 500; }
.site-header nav a:hover { background: #1e293b; text-decoration: none; color: #fff; }
.site-header nav a.active { background: #1e40af; color: #fff; }

/* ---------- buttons & inputs ---------- */
button, .btn { font: inherit; font-size: 13px; padding: 6px 11px; border: 1px solid #cbd5e1; background: #fff; color: var(--ink); border-radius: 7px; cursor: pointer; white-space: nowrap; display: inline-flex; align-items: center; gap: 5px; }
button:hover, .btn:hover { background: #f8fafc; border-color: #94a3b8; text-decoration: none; }
button.primary, .btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.primary:hover, .btn.primary:hover { background: #1d4ed8; }
button.active { background: #fef3c7; border-color: #f59e0b; }
.btn.file input { display: none; }
select, input[type=number], input[type=text] { font: inherit; font-size: 13px; padding: 5px 7px; border: 1px solid #cbd5e1; border-radius: 6px; background: #fff; color: var(--ink); }
input[type=number] { width: 72px; }
label { font-size: 13px; }
label.chk { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }

/* ---------- applet layout ---------- */
.app { display: grid; grid-template-columns: 330px 1fr 330px; height: calc(100vh - 54px); }
.panel { background: var(--panel); overflow-y: auto; border-right: 1px solid var(--line); }
.panel.right { border-right: none; border-left: 1px solid var(--line); }
.panel section { padding: 14px 16px; border-bottom: 1px solid var(--line); }
.panel h3 { margin: 0 0 10px; font-size: 12px; text-transform: uppercase; letter-spacing: .8px; color: var(--muted); }
.panel .row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
.panel select { width: 100%; }
.params { display: flex; flex-wrap: wrap; gap: 8px 12px; margin: 10px 0 6px; }
.params label { display: inline-flex; align-items: center; gap: 6px; }
#exDesc { font-size: 12.5px; margin: 6px 0; }
textarea#qasm { width: 100%; height: 250px; resize: vertical; font-size: 12px; line-height: 1.45; border: 1px solid #cbd5e1; border-radius: 8px; padding: 8px; background: #0b1220; color: #e2e8f0; tab-size: 2; white-space: pre; }
textarea#qasm::selection { background: #f59e0b; color: #000; }
.msg { font-size: 12.5px; margin-top: 6px; }
.msg.err { color: var(--err); } .msg.ok { color: var(--ok); }
.msg .warn { color: var(--warn); }
.modes { display: flex; flex-direction: column; gap: 6px; }
.modes label { display: flex; gap: 7px; align-items: flex-start; cursor: pointer; }
.modes small { color: var(--muted); display: block; }
.sub-input { margin: 4px 0 2px 24px; display: flex; gap: 6px; align-items: center; }
.sub-input input { width: 150px; font-family: var(--mono); }
.opts { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 10px; }

/* legend */
#legend { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 8px; }
.lg { display: flex; align-items: center; gap: 6px; font-size: 12px; }
.lg.heat i { display: inline-block; width: 70px; height: 10px; border-radius: 5px; background: linear-gradient(90deg, #3b82f6, #14b8a6, #facc15, #f97316, #dc2626); }

/* stage */
.stage { position: relative; display: flex; flex-direction: column; min-width: 0; background: #fff; }
.toolbar { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; padding: 8px 10px; border-bottom: 1px solid var(--line); background: #f8fafc; }
.toolbar .sep { width: 1px; height: 24px; background: var(--line); margin: 0 4px; }
.toolbar label { display: inline-flex; gap: 5px; align-items: center; color: var(--muted); }
.toolbar input[type=range] { width: 80px; }
#canvas { flex: 1; width: 100%; min-height: 0; display: block; cursor: grab; background:
  radial-gradient(circle, #e5e7eb 1px, transparent 1px) 0 0 / 22px 22px; user-select: none; }
#canvas.panning { cursor: grabbing; }
.hint { padding: 7px 12px; font-size: 12.5px; color: var(--muted); border-top: 1px solid var(--line); background: #f8fafc; }
.stage.drop::after { content: 'Drop a .qasm file to load it'; position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(37, 99, 235, .12); border: 3px dashed var(--accent); font-size: 20px; font-weight: 600; color: var(--accent); pointer-events: none; }
#flash { position: absolute; left: 50%; top: 58px; transform: translateX(-50%); background: #0f172a; color: #fff; padding: 7px 14px; border-radius: 8px; font-size: 13px; opacity: 0; transition: opacity .25s; pointer-events: none; z-index: 30; }
#flash.show { opacity: .92; }

/* tooltip */
.tooltip { position: absolute; display: none; z-index: 40; max-width: 380px; min-width: 220px; background: rgba(255, 255, 255, .98); border: 1px solid #cbd5e1; border-radius: 10px; box-shadow: 0 10px 30px rgba(15, 23, 42, .18); padding: 10px 12px; font-size: 12.5px; pointer-events: none; }
.tooltip h4 { margin: 0 0 6px; font-size: 14px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tooltip .tag { font-size: 10.5px; font-weight: 600; background: #eef2ff; color: #3730a3; padding: 1px 7px; border-radius: 10px; }
.tooltip > div { margin: 3px 0; }
.tooltip .grid2 { display: grid; grid-template-columns: auto 1fr auto 1fr; gap: 1px 8px; margin: 6px 0; padding: 5px 7px; background: #f8fafc; border-radius: 6px; }
.tooltip .grid2 span { color: var(--muted); }
.tooltip .legs { font-size: 11.5px; }
.tooltip .pv { margin-top: 7px; padding: 6px 8px; background: #fffbeb; border: 1px solid #fde68a; border-radius: 6px; }
table.mat { border-collapse: collapse; font-family: var(--mono); font-size: 11px; margin: 3px 0; border-left: 2px solid #475569; border-right: 2px solid #475569; }
table.mat td { padding: 1px 6px; text-align: center; }
table.mat .z { color: #cbd5e1; }

/* right panel */
table.kv { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.kv th { text-align: left; font-weight: 500; color: var(--muted); padding: 3px 8px 3px 0; white-space: nowrap; vertical-align: top; }
table.kv td { padding: 3px 0; text-align: right; }
#chart { width: 100%; height: 130px; display: block; }
#chart .ax { font-size: 9.5px; fill: var(--muted); }
#chart .chart-empty { font-size: 12px; fill: var(--muted); text-anchor: middle; }
#log { list-style: none; margin: 0; padding: 0; max-height: 300px; overflow-y: auto; font-size: 12px; }
#log li { padding: 4px 6px; border-radius: 6px; cursor: pointer; border-bottom: 1px dashed var(--line); }
#log li:hover { background: #eff6ff; }
#log li .st { display: inline-block; min-width: 26px; color: var(--muted); font-family: var(--mono); }
#log li .meta { display: block; color: var(--muted); font-size: 11px; margin-left: 26px; }
.bigval { font-size: 18px; margin: 4px 0 8px; font-family: var(--mono); }
table.amps { width: 100%; border-collapse: collapse; font-size: 12px; }
table.amps th { text-align: left; color: var(--muted); font-weight: 500; border-bottom: 1px solid var(--line); }
table.amps td { padding: 2px 4px 2px 0; font-family: var(--mono); font-size: 11.5px; white-space: nowrap; }
.bar { display: inline-block; width: 46px; height: 8px; background: #e2e8f0; border-radius: 4px; margin-right: 5px; vertical-align: middle; overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--accent); }

/* ---------- content pages ---------- */
.page { max-width: 1060px; margin: 0 auto; padding: 32px 24px 60px; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: center; padding: 20px 0 10px; }
.hero h1 { font-size: 34px; line-height: 1.15; margin: 0 0 14px; }
.hero p { font-size: 16px; color: #334155; }
.hero .cta { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.hero .cta .btn { font-size: 15px; padding: 9px 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; box-shadow: 0 1px 2px rgba(15, 23, 42, .04); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; margin: 22px 0; }
.cards .card h3 { margin: 0 0 6px; font-size: 17px; }
.cards .card p { margin: 0 0 10px; color: #334155; }
.thumb { width: 100%; height: 190px; border: 1px solid var(--line); border-radius: 10px; background: #fff; display: block; }
.page h2 { margin: 34px 0 10px; font-size: 23px; }
.page h3 { margin: 22px 0 8px; }
.page p, .page li { color: #1e293b; font-size: 15px; }
.page pre { background: #0b1220; color: #e2e8f0; padding: 12px 14px; border-radius: 10px; overflow-x: auto; font-size: 12.5px; line-height: 1.5; }
.formula { font-family: "Cambria Math", "STIX Two Math", Georgia, serif; font-size: 17px; background: #f8fafc; border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; margin: 10px 0; text-align: center; }
.ex-controls { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 6px 0 10px; }
.kbd { display: inline-block; font-family: var(--mono); font-size: 12px; padding: 1px 7px; border: 1px solid #cbd5e1; border-bottom-width: 2px; border-radius: 5px; background: #fff; }
table.doc { border-collapse: collapse; width: 100%; font-size: 14px; margin: 10px 0; }
table.doc th, table.doc td { border-bottom: 1px solid var(--line); padding: 7px 8px; text-align: left; vertical-align: top; }
table.doc th { color: var(--muted); font-weight: 600; }
.legend-big { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.legend-big .lg { font-size: 14px; background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 6px 10px; }
footer.site { text-align: center; color: var(--muted); font-size: 12.5px; padding: 26px; }
.toc { columns: 2; font-size: 14px; }

@media (max-width: 1200px) { .app { grid-template-columns: 290px 1fr 290px; } }
@media (max-width: 960px) {
  .app { grid-template-columns: 1fr; height: auto; }
  .stage { height: 75vh; }
  .panel { border: none; }
  .hero { grid-template-columns: 1fr; }
}