/* Landing de tetramon: azul del logo (#007BB7, aclarado para fondo oscuro) sobre el gris oscuro del icono. */
:root {
  --bg: #0f131a;
  --bg-alt: #141a23;
  --panel: #1e2430;
  --panel-border: #2c3444;
  --text: #e8ecf2;
  --soft: #cfd6e1;
  --faint: #9aa4b5;
  --accent: #2fa4e7;
  --accent-ink: #04131d;
  --link: #6cb6ff;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55), 0 2px 6px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
}

a { color: var(--link); }
img { max-width: 100%; height: auto; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 16px; }

/* ----- Header ----- */

header.top {
  position: sticky; top: 0; z-index: 10;
  background: rgba(15, 19, 26, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--panel-border);
}
header.top .wrap {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 60px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-size: 22px; font-weight: 300; }
.brand img { width: 32px; height: 32px; border-radius: 6px; }
.brand b { color: var(--accent); font-weight: 600; }
nav { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: 4px 18px; }
nav a { color: var(--faint); text-decoration: none; }
nav a:hover { color: var(--text); }
/* Language: the globe and one code per language (ES, EN); the page's own one stands out. */
.langs { display: inline-flex; align-items: center; gap: 6px; margin-left: 6px; color: var(--faint); }
.lang-icon { width: 16px; height: 16px; flex: none; }
nav a.lang { font-size: 0.8em; font-weight: 600; letter-spacing: 0.04em; }
nav a.lang.current { color: var(--text); text-decoration: underline; text-underline-offset: 3px; }
nav a.nav-download {
  color: var(--accent); border: 1px solid rgba(47, 164, 231, 0.5); border-radius: 6px; padding: 4px 12px;
}
nav a.nav-download:hover { background: rgba(47, 164, 231, 0.12); color: var(--accent); }

/* ----- Buttons ----- */

.download {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--accent); color: var(--accent-ink); text-decoration: none;
  font-weight: 600; font-size: 18px; padding: 13px 24px; border-radius: 8px;
  box-shadow: 0 8px 24px rgba(47, 164, 231, 0.25);
}
.download svg { width: 20px; height: 20px; }
.download:hover { filter: brightness(1.08); }
.secondary {
  display: inline-flex; align-items: center; padding: 12px 20px; border-radius: 8px;
  color: var(--text); text-decoration: none; border: 1px solid var(--panel-border); font-size: 17px;
}
.secondary:hover { border-color: var(--faint); }

/* ----- Hero ----- */

.home .hero {
  overflow-x: clip;
  padding: 64px 0 0;
  background:
    radial-gradient(900px 420px at 50% 0%, rgba(47, 164, 231, 0.16), transparent 70%),
    radial-gradient(700px 500px at 85% 60%, rgba(108, 182, 255, 0.08), transparent 70%);
}
.hero-text { text-align: center; }
.hero h1 { font-size: 54px; font-weight: 600; letter-spacing: -0.02em; line-height: 1.08; margin: 8px 0 16px; }
.hero h1 .accent { color: var(--accent); }
.hero .lead { font-size: 20px; color: var(--faint); margin: 0 auto 28px; max-width: 720px; }
.cta { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }
.meta { color: var(--faint); font-size: 14px; margin-top: 14px; }
.meta a { color: var(--faint); }

.collage { position: relative; margin: 48px auto 0; max-width: 1080px; padding-bottom: 72px; }
.collage a { display: block; }
.collage img { display: block; border-radius: 10px; border: 1px solid var(--panel-border); box-shadow: var(--shadow); }
.collage .side { position: absolute; right: -24px; bottom: 16px; width: 46%; }
.collage .side img { box-shadow: 0 30px 70px rgba(0, 0, 0, 0.7); }

/* ----- Facts ----- */

.facts { border-top: 1px solid var(--panel-border); border-bottom: 1px solid var(--panel-border); background: var(--bg-alt); }
.facts .wrap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding: 28px 16px; }
.facts div { display: flex; flex-direction: column; gap: 2px; text-align: center; }
.facts strong { font-size: 19px; color: var(--text); }
.facts span { color: var(--faint); font-size: 14px; }

/* ----- Features: one row per section, text and screenshot alternating ----- */

.features { padding: 8px 0 24px; }
.feature { padding: 56px 0; scroll-margin-top: 60px; }
.feature:nth-child(even) { background: var(--bg-alt); }
.feature .wrap { display: grid; grid-template-columns: 5fr 7fr; gap: 48px; align-items: start; }
.feature:nth-child(even) .wrap { grid-template-columns: 7fr 5fr; }
.feature:nth-child(even) .text { order: 2; }
.feature.no-shot .wrap { grid-template-columns: 1fr; max-width: 860px; }
.feature .kicker { color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; }
.feature h2 { margin: 4px 0 14px; font-size: 32px; font-weight: 600; letter-spacing: -0.01em; }
/* La seccion empieza por las preguntas que responde, luego "Pues con tetramon puedes:" y su lista. */
.feature h2.kicker { font-size: 13px; margin: 0 0 14px; letter-spacing: 0.08em; }
.feature ul.questions { margin: 0 0 4px; }
.feature ul.questions li {
  padding-left: 0; margin: 0 0 12px; color: var(--text);
  font-size: 22px; font-weight: 600; line-height: 1.3; letter-spacing: -0.01em;
}
.feature ul.questions li::before { content: none; }
.feature ul.questions code { font-size: 0.8em; }
.feature ul.questions strong { color: var(--accent); }
.feature .answer {
  margin: 20px 0 8px; padding-top: 16px; border-top: 1px solid var(--panel-border);
  color: var(--accent); font-size: 17px; font-weight: 600;
}
.feature ul { margin: 0; padding: 0; list-style: none; }
.feature li { position: relative; margin: 9px 0; padding-left: 22px; color: var(--soft); }
.feature li::before {
  content: ""; position: absolute; left: 2px; top: 0.62em; width: 8px; height: 8px; border-radius: 2px;
  background: var(--accent); transform: rotate(45deg);
}
.feature li strong, .doc strong { color: var(--text); }
.feature figure { margin: 0; position: sticky; top: 92px; }
.feature figure a { display: block; }
.feature figure img {
  display: block; margin: 0 auto; border-radius: 10px; border: 1px solid var(--panel-border); box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}
.feature figure a:hover img { transform: translateY(-3px); }
.feature figcaption { color: var(--faint); font-size: 13px; text-align: center; margin-top: 10px; }

code { background: #0b0e13; border: 1px solid var(--panel-border); border-radius: 4px; padding: 0 4px; font-size: 0.9em; }

/* ----- Proposals and problems ----- */

.feedback { padding: 64px 0 24px; }
.feedback .wrap { max-width: 720px; }
.feedback h2 { font-size: 30px; font-weight: 600; margin: 0 0 6px; }
.feedback p { color: var(--faint); margin: 0 0 22px; }
.feedback form { background: var(--panel); border: 1px solid var(--panel-border); border-radius: 12px; padding: 22px; }
.feedback .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.feedback label { display: block; font-size: 14px; color: var(--faint); margin-bottom: 14px; }
.feedback select, .feedback input[type=text], .feedback textarea {
  display: block; width: 100%; box-sizing: border-box; margin-top: 6px; padding: 9px 10px;
  background: var(--bg); color: var(--text); border: 1px solid var(--panel-border); border-radius: 8px; font: inherit;
}
.feedback textarea { resize: vertical; min-height: 110px; }
.feedback select:focus, .feedback input:focus, .feedback textarea:focus { outline: 2px solid var(--link); outline-offset: 1px; }
.feedback .trap { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.feedback .send { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.feedback button.download { border: 0; cursor: pointer; font: inherit; font-weight: 600; }
.feedback button.download:disabled { opacity: 0.6; cursor: default; }
.feedback .status { color: var(--soft); font-size: 15px; }
.feedback .status.bad { color: #ff8a80; }
.feedback .note { font-size: 13px; margin: 14px 0 0; }

/* ----- Closing band ----- */

.closing { padding: 72px 0 80px; text-align: center; background: radial-gradient(700px 300px at 50% 100%, rgba(47, 164, 231, 0.14), transparent 70%); }
.closing h2 { font-size: 34px; font-weight: 600; margin: 0 0 8px; }
.closing p { color: var(--faint); margin: 0 0 26px; }

/* ----- Screenshot viewer ----- */

dialog.viewer { padding: 0; border: 0; background: transparent; max-width: 96vw; max-height: 94vh; overflow: visible; }
dialog.viewer::backdrop { background: rgba(5, 7, 10, 0.86); }
dialog.viewer img { display: block; max-width: 96vw; max-height: 94vh; border-radius: 8px; box-shadow: var(--shadow); cursor: zoom-out; }
dialog.viewer button {
  position: absolute; top: -14px; right: -14px; width: 32px; height: 32px; border-radius: 50%;
  border: 1px solid var(--panel-border); background: var(--panel); color: var(--text); font-size: 20px; line-height: 1; cursor: pointer;
}
a.zoom { cursor: zoom-in; }

/* ----- Other pages (changelog, privacy) ----- */

.doc { padding: 32px 16px 56px; max-width: 820px; }
.doc h1 { font-weight: 300; font-size: 38px; margin: 0 0 16px; }
.doc h2 { font-size: 22px; margin: 32px 0 6px; color: var(--accent); }
.doc h3 { font-size: 16px; margin: 16px 0 4px; color: var(--faint); text-transform: uppercase; letter-spacing: 0.04em; }
.doc li { margin: 4px 0; color: var(--soft); }

footer { border-top: 1px solid var(--panel-border); color: var(--faint); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding: 18px 16px; }
footer a { color: var(--faint); margin-left: 16px; }

@media (max-width: 900px) {
  .feature figure { position: static; }
  .feature .wrap, .feature:nth-child(even) .wrap { grid-template-columns: 1fr; gap: 28px; }
  .feature:nth-child(even) .text { order: 0; }
  .facts .wrap { grid-template-columns: repeat(2, 1fr); }
  .collage .side { display: none; }
  .collage { padding-bottom: 48px; }
}

@media (max-width: 640px) {
  .home .hero { padding-top: 36px; }
  .hero h1 { font-size: 36px; }
  .hero .lead { font-size: 17px; }
  .feature ul.questions li { font-size: 19px; }
  .feature { padding: 40px 0; }
  .feature h2 { font-size: 26px; }
  nav a:not(.nav-download):not(.lang) { display: none; }
  .langs { margin-left: 0; }
  .closing h2 { font-size: 26px; }
  .feedback .row { grid-template-columns: 1fr; gap: 0; }
  .feedback h2 { font-size: 24px; }
}

/* Iconos de bandeja: pixel a pixel, sin suavizar al ampliar */
.feature figure img.pixel { image-rendering: pixelated; }