:root {
  --bg: #0a0e1c;
  --card: #111830;
  --line: #26335a;
  --text: #dbe4ff;
  --dim: #8a97bd;
  --accent: #ffc857;
  --green: #41d98a;
  --red: #ff7b72;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px 4vw 60px;
  background: radial-gradient(ellipse at top, #101a38 0%, var(--bg) 60%);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
}

h1 { font-size: 1.5rem; margin: 0 0 20px; }
h2 { font-size: 1.05rem; margin: 0 0 14px; color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  margin-bottom: 26px;
  max-width: 1250px;
}

.row { display: flex; flex-wrap: wrap; gap: 22px; align-items: flex-start; }

canvas {
  background: #02040f;
  border: 1px solid var(--line);
  border-radius: 10px;
  display: block;
}

#scene3d {
  width: min(66vw, 640px);
  height: min(66vw, 640px);
  background: #02040f;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
#scene3d canvas { border: none; border-radius: 0; background: transparent; display: block; touch-action: none; }
/* columna de controles a la derecha, compacta */
.side.ctrls { flex: 0 0 33%; width: 33%; min-width: 200px; }
.side.ctrls .controls { flex-direction: column; align-items: flex-start; gap: 10px; }
.side.ctrls label { font-size: 0.75rem; }
.side.ctrls button { font-size: 0.72rem; padding: 6px 9px; min-height: 28px; }
.side.ctrls select, .side.ctrls input[type="date"] { font-size: 0.72rem; padding: 5px 7px; }
.side.ctrls input[type="number"], .side.ctrls input[type="range"] { width: 150px; }
#sky0, #sky1 {
  width: min(96vw, 480px);
  height: calc(min(96vw, 480px) * 300 / 480);
}

.side { display: flex; flex-direction: column; gap: 14px; min-width: 300px; flex: 1; }

.panel {
  background: #0c1226;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.95rem;
}
.panel p { margin: 6px 0; }
.panel hr { border: none; border-top: 1px solid var(--line); margin: 12px 0; }

.small { font-size: 0.82rem; color: var(--dim); }
.hint  { font-size: 0.82rem; color: var(--dim); max-width: 900px; }

.controls { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin: 10px 0; }
.controls label { font-size: 0.9rem; color: var(--dim); }

input[type="number"] {
  width: 110px;
  background: #060a18;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 1rem;
}

input[type="date"] {
  background: #060a18;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.9rem;
  color-scheme: dark;
}

select {
  background: #060a18;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 0.9rem;
}

input[type="color"] {
  width: 44px;
  height: 30px;
  padding: 2px;
  background: #060a18;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}

button {
  background: #1c2a52;
  color: var(--text);
  border: 1px solid #35508f;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 0.9rem;
  cursor: pointer;
}
button:hover { background: #26386b; }

button.active {
  background: #17573b;
  border-color: var(--green);
  color: #d6ffe9;
}

button:disabled, input[type="range"]:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

figure { margin: 0; }
figcaption { font-size: 0.82rem; color: var(--dim); margin-top: 6px; max-width: 480px; }

.fatal {
  display: none;
  background: #3a1114;
  border: 1px solid var(--red);
  color: #ffd6d2;
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  max-width: 1250px;
}

.calc-title { color: var(--accent); font-weight: bold; margin-top: 12px; }
ol.calc {
  margin: 8px 4px 4px 24px;
  padding: 0;
  counter-reset: calc;
  list-style: decimal;
}
ol.calc li {
  margin: 5px 0;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.84rem;
  color: #c9d4f5;
}

nav.tabs { display: flex; gap: 10px; margin: 0 0 16px; }
nav.tabs a {
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid #35508f;
  background: #1c2a52;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
}
nav.tabs a.on { background: #26386b; border-color: #5b7dc4; color: #fff; }

/* ---------- landing / hub ---------- */
body.landing { padding-top: 24px; }
.hero { text-align: center; }
.hero .avatar {
  width: 140px; height: 140px; border-radius: 50%;
  object-fit: cover; border: 3px solid var(--accent);
  box-shadow: 0 0 24px rgba(255, 200, 87, 0.35);
  margin-bottom: 12px;
}
.hero h1 { font-size: 1.6rem; margin: 6px 0 10px; }
.hero p { max-width: 560px; margin: 0 auto 12px; }
.btnbig {
  display: inline-block; margin-top: 8px;
  padding: 12px 22px; border-radius: 12px;
  background: #26386b; border: 1px solid #5b7dc4;
  color: #fff; text-decoration: none; font-size: 1.05rem;
}
.btnbig:hover { background: #2f4780; }
.appcard {
  display: block; border: 1px solid var(--line); border-radius: 12px;
  background: #0c1226; padding: 16px; text-decoration: none; color: var(--text);
  min-width: 280px; flex: 1;
}
.appcard:hover { border-color: #5b7dc4; background: #101a38; }
.appcard h3 { margin: 2px 0 8px; color: var(--accent); }
.appcard p { margin: 0 0 10px; }
.btnbig2 {
  display: inline-block; padding: 8px 14px; border-radius: 10px;
  background: #26386b; border: 1px solid #5b7dc4; color: #fff; font-size: 0.9rem;
}
footer p a { color: #9ecbff; }

/* ---------- móvil (≤640 px): una columna, lijas táctiles ---------- */
@media (max-width: 640px) {
  body { padding: 12px 3vw 40px; }
  h1 { font-size: 1.15rem; }
  h2 { font-size: 1rem; }
  .card { padding: 14px; border-radius: 10px; }
  .row { flex-direction: column; gap: 12px; }
  .side { min-width: 0; width: 100%; }
  #scene3d { width: 62vw; height: 62vw; max-width: 320px; max-height: 320px; border-radius: 0; }
  .side.ctrls { flex-basis: 37vw; width: 37vw; min-width: 110px; }
  .side.ctrls button { font-size: 0.68rem; padding: 5px 7px; min-height: 26px; }
  .side.ctrls label, .side.ctrls .controls { font-size: 0.68rem; }
  .side.ctrls input[type="range"] { width: 110px; }
  #sky0, #sky1 { height: calc(min(94vw, 430px) * 300 / 480); }
  .panel { width: 100%; }
  .controls { gap: 10px; }
  .controls label { font-size: 0.85rem; }
  .panel { font-size: 0.85rem; padding: 10px 12px; }
  .small, .hint { font-size: 0.78rem; }
  button { padding: 9px 12px; font-size: 0.85rem; min-height: 40px; }
  input[type="number"] { width: 92px; padding: 8px; font-size: 0.95rem; }
  input[type="range"] { height: 34px; }
  select { padding: 9px 10px; font-size: 0.85rem; }
  nav.tabs { gap: 8px; }
  nav.tabs a { padding: 9px 12px; font-size: 0.85rem; }
  ol.calc li { font-size: 0.72rem; }
}