:root {
  --bg: #0f1420;
  --panel: #171d2b;
  --panel-2: #1e2636;
  --border: #2b3448;
  --fg: #d7dee9;
  --fg-dim: #8b97ac;
  --accent: #4f9cf9;
  --ok: #47c26b;
  --err: #ef5b5b;
  --warn: #e0a63a;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg); }
a { color: var(--accent); text-decoration: none; }
button {
  font: inherit; color: var(--fg); background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 6px; padding: 6px 12px; cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: #06101f; font-weight: 600; }
code, .mono { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }

/* ---------- galeria ---------- */
.wrap { max-width: 980px; margin: 0 auto; padding: 32px 20px 64px; }
.wrap h1 { font-size: 22px; margin: 0 0 4px; }
.wrap .sub { color: var(--fg-dim); margin: 0 0 28px; }
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px; display: block; transition: border-color .12s;
}
.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 6px; font-size: 15px; color: var(--fg); }
.card p { margin: 8px 0 0; color: var(--fg-dim); font-size: 13px; line-height: 1.45; }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  font-size: 11px; padding: 2px 7px; border-radius: 999px;
  background: var(--panel-2); border: 1px solid var(--border); color: var(--fg-dim);
}

/* ---------- workbench ---------- */
.wb { display: grid; height: 100%; grid-template-rows: 44px 1fr; }
.topbar {
  display: flex; align-items: center; gap: 12px; padding: 0 12px;
  background: var(--panel); border-bottom: 1px solid var(--border);
}
.topbar .title { font-size: 13px; font-weight: 600; }
.topbar .spacer { flex: 1; }
.topbar .muted { color: var(--fg-dim); font-size: 12px; }
.modeswitch { display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.modeswitch button { border: 0; border-radius: 0; padding: 4px 10px; font-size: 12px; background: var(--panel); }
.modeswitch button.on { background: var(--accent); color: #06101f; font-weight: 600; }

.cols {
  display: grid;
  grid-template-columns: var(--c1, 300px) 6px var(--c2, 1fr) 6px minmax(340px, 1.2fr);
  min-height: 0; overflow: hidden;
}
.pane { display: flex; flex-direction: column; min-width: 0; min-height: 0; }

/* splitters */
.gutter { background: var(--border); z-index: 5; touch-action: none; }
.gutter.gv { cursor: col-resize; }
.gutter.gh { cursor: row-resize; height: 6px; }
.gutter:hover, .gutter:active { background: var(--accent); }

/* consola / ondas dentro de la 3a columna */
.rsplit {
  flex: 1; min-height: 0;
  display: grid; grid-template-rows: var(--r1, 150px) 6px minmax(120px, 1fr);
}
.run-console, .run-waves { display: flex; flex-direction: column; min-height: 0; overflow: hidden; }
#console { flex: 1; min-height: 0; overflow: auto; }
#waves { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.surfer-frame { flex: 1; width: 100%; height: 100%; border: 0; background: #fff; }

/* maximizar el visor de ondas */
.run-waves.maximized {
  position: fixed; left: 0; right: 0; top: 44px; bottom: 0; z-index: 60; background: var(--bg);
}
.pane > header {
  display: flex; align-items: center; gap: 8px; padding: 6px 10px; font-size: 12px;
  text-transform: uppercase; letter-spacing: .04em; color: var(--fg-dim);
  background: var(--panel); border-bottom: 1px solid var(--border);
}
.hdr-link { font-size: 11px; text-transform: none; letter-spacing: 0; }
#blockinfo .blk-link { margin-top: 8px; font-size: 11px; padding: 3px 8px; }
.pane > .body { flex: 1; min-height: 0; overflow: auto; }

/* esquema */
#schema svg { width: 100%; height: auto; display: block; padding: 6px 4px; }
#schema .sch-band { fill: #1b2740; }
#schema .sch-band.b { fill: #1a1f2c; }
#schema .sch-env { fill: none; stroke: var(--fg-dim); stroke-width: 1.2; stroke-dasharray: 5 3; }
#schema .sch-envlbl { fill: var(--fg-dim); font-size: 10px; font-style: italic; }
#schema .sch-lvl { fill: var(--fg-dim); font-size: 11px; font-weight: 700; font-style: italic; }
#schema .sch-lvlsub { fill: var(--fg-dim); font-size: 9px; opacity: .8; }
#schema .sch-edge { fill: none; stroke: var(--fg-dim); stroke-width: 1.4; marker-end: url(#ar); opacity: .8; }
#schema .sch-edge.dash { stroke-dasharray: 4 3; }
#schema marker path { fill: var(--fg-dim); }
#schema .sch-elbl { fill: var(--fg-dim); font-size: 9.5px; }
#schema .sch-rect { fill: var(--panel-2); stroke: var(--border); stroke-width: 1.6; }
#schema .sch-rect.block  { fill: #223250; stroke: var(--accent); }
#schema .sch-rect.accent { fill: #3a2c14; stroke: var(--warn); }
#schema .sch-rect.dut    { fill: #3a2020; stroke: var(--err); }
#schema .sch-rect.iface  { fill: #1e3350; stroke: var(--accent); }
#schema .sch-rect.unbound { fill: var(--panel-2); stroke: var(--fg-dim); stroke-dasharray: 4 3; opacity: .5; }
#schema .sch-blk.clickable { cursor: pointer; }
#schema .sch-blk.clickable:hover .sch-rect { fill: #2c4368; }
#schema .sch-blk.active .sch-rect { stroke: var(--ok); stroke-width: 2.6; }
#schema .sch-blk.correct .sch-rect { stroke: var(--ok); stroke-width: 2.6; fill: #1e3a2a; }
#schema .sch-blk.wrong .sch-rect { stroke: var(--err); stroke-width: 2.6; fill: #3a2020; }
#schema .sch-blbl { fill: var(--fg); font-size: 12px; font-weight: 600; }
#schema .sch-blbl.unbound { fill: var(--fg-dim); font-weight: 500; }
#schema .sch-bsub { fill: var(--fg-dim); font-size: 8.5px; }

/* modo ejercicio */
.exercise { padding: 10px 12px; border-top: 1px solid var(--border); background: var(--panel); }
.exercise .hint { margin: 0 0 10px; font-size: 12.5px; color: var(--fg-dim); }
.ex-rows { display: flex; flex-direction: column; gap: 6px; }
.ex-row { display: grid; grid-template-columns: 1fr 150px 20px auto; align-items: center; gap: 6px; }
.ex-name { font-size: 12.5px; }
.ex-sel { font: inherit; font-size: 12px; background: var(--panel-2); color: var(--fg); border: 1px solid var(--border); border-radius: 5px; padding: 3px; }
.ex-mark { font-weight: 700; text-align: center; }
.ex-mark.ok { color: var(--ok); } .ex-mark.bad { color: var(--err); }
.ex-reveal { font-size: 11px; padding: 2px 7px; }
.ex-bar { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.ex-score { font-weight: 700; font-size: 14px; }
.ex-score.ok { color: var(--ok); }

.file-item { font-size: 12.5px; padding: 3px 4px; cursor: pointer; color: var(--fg-dim); }
.file-item:hover { color: var(--fg); }

/* overlay de diff */
.diff-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .55);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.diff-box {
  width: min(1100px, 92vw); height: 80vh; background: var(--panel);
  border: 1px solid var(--border); border-radius: 10px; display: flex; flex-direction: column; overflow: hidden;
}
.diff-head { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-bottom: 1px solid var(--border); font-size: 13px; }
.diff-head .diff-file { font: inherit; font-size: 12px; background: var(--panel-2); color: var(--fg); border: 1px solid var(--border); border-radius: 5px; padding: 3px; }
.diff-head .diff-count { color: var(--fg-dim); font-size: 12px; }
.diff-body { flex: 1; min-height: 0; }
#schema .blk text { fill: var(--fg); font-size: 13px; pointer-events: none; }
#schema .edge { stroke: var(--fg-dim); stroke-width: 1.4; fill: none; marker-end: url(#arrow); opacity: .7; }
#blockinfo { padding: 10px 12px; border-top: 1px solid var(--border); font-size: 13px; line-height: 1.5; background: var(--panel); }
#blockinfo h4 { margin: 0 0 4px; font-size: 13px; }
#blockinfo .loc { color: var(--fg-dim); font-size: 12px; }

/* editor */
.tabs { display: flex; gap: 2px; padding: 4px 6px 0; background: var(--panel); overflow-x: auto; }
.tab {
  font-size: 12px; padding: 5px 10px; border: 1px solid var(--border); border-bottom: none;
  border-radius: 6px 6px 0 0; background: var(--panel-2); color: var(--fg-dim); cursor: pointer; white-space: nowrap;
}
.tab.active { color: var(--fg); background: var(--bg); }
.tab .dot { color: var(--warn); }
#editor { width: 100%; height: 100%; }

/* consola + ondas */
#console {
  font-family: ui-monospace, Consolas, monospace; font-size: 12.5px; line-height: 1.45;
  padding: 8px 10px; white-space: pre-wrap; word-break: break-word;
}
#console .l-err { color: var(--err); }
#console .l-ok { color: var(--ok); }
#console .l-link { color: var(--accent); cursor: pointer; text-decoration: underline; }
#console .l-meta { color: var(--fg-dim); }
.runbar { display: flex; gap: 8px; padding: 6px 10px; background: var(--panel); border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.status { font-size: 12px; align-self: center; }
.status.ok { color: var(--ok); } .status.err { color: var(--err); } .status.run { color: var(--warn); }

#waves iframe { flex: 1; width: 100%; border: 0; background: #fff; }
#waves .placeholder { padding: 16px; color: var(--fg-dim); font-size: 13px; }