:root {
  --bg: #0a0a0b;
  --panel: #111214;
  --line: #26282c;
  --ink: #e9e6df;
  --mid: #9a978f;
  --faint: #5b5a56;
  --accent: #5ee28a;
  --warn: #e0a15a;
  --bad: #e07a6a;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { background: var(--bg); }
body { margin: 0; color: var(--ink); font: 15px/1.6 var(--mono); min-height: 100dvh; display: flex; flex-direction: column; }
#app { display: flex; flex-direction: column; flex: 1; width: min(880px, 100% - 32px); margin: 0 auto; }
a { color: var(--accent); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 28px; padding: 26px 0 18px; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: baseline; gap: 12px; text-decoration: none; color: var(--ink); }
.brand { align-items: center; }
.brand b { font: 400 1.7rem/1 var(--serif); letter-spacing: .28em; text-transform: lowercase; }
.cicada { display: block; filter: drop-shadow(0 0 6px rgba(94, 226, 138, .35)); }
.brand-runes { font-size: 1.4rem; color: var(--accent); letter-spacing: .12em; }
.top-right { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.lang { display: flex; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; }
.lang button { font: inherit; font-size: .78rem; background: none; border: 0; color: var(--mid); padding: 5px 9px; cursor: pointer; letter-spacing: .08em; }
.lang button + button { border-left: 1px solid var(--line); }
.lang button[aria-pressed="true"] { color: var(--ink); background: var(--panel); }
.tabs a { padding: 6px 14px; color: var(--mid); text-decoration: none; border: 1px solid transparent; border-radius: 3px; }
.tabs a:hover { color: var(--ink); }
.tabs a[aria-current="true"] { color: var(--ink); border-color: var(--line); background: var(--panel); }

main { flex: 1; padding: 28px 0 40px; }
h2 { font: 400 1.9rem/1.1 var(--serif); margin: 0 0 6px; }
h3 { font: 400 .78rem/1 var(--mono); letter-spacing: .18em; text-transform: uppercase; color: var(--mid); margin: 30px 0 12px; }
.lede { color: var(--mid); max-width: 62ch; margin: 0 0 8px; }
small { color: var(--mid); font-size: .82rem; display: block; margin-top: 6px; }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; margin-bottom: 14px; }
.seg button { font: inherit; background: none; border: 0; color: var(--mid); padding: 7px 16px; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-selected="true"] { background: var(--panel); color: var(--ink); }

.drop { display: grid; place-items: center; text-align: center; min-height: 92px; padding: 16px; border: 1px dashed var(--faint); border-radius: 4px; color: var(--mid); cursor: pointer; margin-bottom: 10px; }
.drop:hover, .drop.over, .drop:focus-within { border-color: var(--accent); color: var(--ink); }
textarea, input[type=text], input[type=password], select { width: 100%; font: inherit; color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: 3px; padding: 10px 12px; }
textarea { resize: vertical; }
textarea:focus, input:focus, select:focus { outline: 1px solid var(--accent); outline-offset: 0; }
.field { display: block; margin: 8px 0 14px; }
.field .label { display: block; color: var(--mid); font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 6px; }
.row { display: flex; gap: 6px; }

button { font: inherit; }
button.primary { background: var(--accent); color: #10140c; border: 0; border-radius: 3px; padding: 11px 22px; cursor: pointer; font-weight: 600; letter-spacing: .04em; margin: 10px 0; }
button.primary:disabled { opacity: .35; cursor: not-allowed; }
button.primary:not(:disabled):hover { filter: brightness(1.1); }
button.ghost { background: none; color: var(--mid); border: 1px solid var(--line); border-radius: 3px; padding: 7px 12px; cursor: pointer; }
button.ghost:hover { color: var(--ink); border-color: var(--faint); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.meter { margin: 14px 0 4px; }
.bar { height: 5px; background: var(--line); border-radius: 3px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.meter.over .bar i { background: var(--bad); }
.meter.over small { color: var(--bad); }

.notice { padding: 10px 14px; border-left: 3px solid var(--accent); background: var(--panel); margin: 14px 0; }
.notice.error { border-color: var(--bad); }
.result { margin-top: 10px; }
.pair { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 14px 0; }
figure { margin: 0; }
figure canvas, .preview canvas, img.found { max-width: 100%; height: auto; border: 1px solid var(--line); display: block; image-rendering: auto; }
canvas.heat { width: 100%; image-rendering: pixelated; aspect-ratio: 1; }
figcaption { color: var(--mid); font-size: .82rem; margin-top: 6px; }
.preview { margin-top: 12px; }
pre.plain { white-space: pre-wrap; word-break: break-word; background: var(--panel); border: 1px solid var(--line); padding: 14px; border-radius: 3px; font: inherit; }
audio { width: 100%; margin: 10px 0; }

.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin: 10px 0 6px; }
.controls input[type=range] { flex: 1 1 200px; accent-color: var(--accent); }
.controls select { width: auto; }
table { border-collapse: collapse; width: 100%; margin: 10px 0; }
th, td { text-align: left; padding: 6px 12px 6px 0; border-bottom: 1px solid var(--line); font-weight: 400; }
th { color: var(--mid); }
table.rune-table { max-width: 420px; }
td.rune { font-size: 1.4rem; color: var(--accent); cursor: pointer; }
.reading { color: var(--mid); padding-left: 1.1rem; }
.meta, .gem { color: var(--mid); }
.err { color: var(--bad); }

footer { padding: 18px 0 30px; border-top: 1px solid var(--line); color: var(--faint); font-size: .82rem; }
@media (max-width: 560px) { body { font-size: 14px; } .top { padding-top: 18px; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* retos encadenados */
.levels { display: grid; gap: 14px; margin: 16px 0; }
.level { border: 1px solid var(--line); border-radius: 4px; padding: 14px 16px 6px; background: var(--panel); }
.level header { display: flex; align-items: baseline; gap: 12px; margin-bottom: 4px; }
.level header b { font: 400 1.15rem/1 var(--serif); }
.level header small { margin: 0; flex: 1; }
.level details { margin: 6px 0 12px; color: var(--mid); }
.level summary { cursor: pointer; }
.row-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 8px 0; }
.levels-out { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin: 14px 0; }
.levels-out img { width: 100%; height: auto; border: 1px solid var(--line); display: block; }
.file { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 8px 0; color: var(--mid); }