/* ══════════════════════════════════════════════════════════════
   sim-tennis.css — Estilos de la simulación Teorema del Eje Intermedio
   Usado por: udea/mt2/tennis-racket.html (standalone, también como iframe)
══════════════════════════════════════════════════════════════ */

/* ─── RESET ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ─── VARIABLES ──────────────────────────────────────────── */
:root {
  --bg:      #06090f;
  --bg2:     #0d1117;
  --bg3:     #161b27;
  --border:  #1f2d42;
  --text:    #c9d1d9;
  --dim:     #4a5568;
  --cyan:    #58a6ff;
  --green:   #3fb950;
  --red:     #f85149;
  --orange:  #e3b341;
  --white:   #e6edf3;
  --r:       8px;
  --mono:    'JetBrains Mono', 'Courier New', monospace;
  --title:   'Syne', sans-serif;
  --ax1:     #3fb950;
  --ax2:     #f85149;
  --ax3:     #58a6ff;
}

/* ─── BASE ───────────────────────────────────────────────── */
html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── HEADER ─────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px 14px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #0a0f1e 0%, var(--bg) 100%);
}

h1 {
  font-family: var(--title);
  font-size: 20px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.3px;
}

.subtitle {
  color: var(--text);
  font-size: 10.5px;
  margin-top: 2px;
  letter-spacing: 0.3px;
}

.badge {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid;
  letter-spacing: 0.5px;
  transition: all 0.4s ease;
}
.badge.stable   { color: var(--green);  border-color: var(--green);  background: rgba(63,185,80,0.08); }
.badge.unstable { color: var(--red);    border-color: var(--red);    background: rgba(248,81,73,0.08); }
.badge.boundary { color: var(--orange); border-color: var(--orange); background: rgba(227,179,65,0.08); }

/* ─── LAYOUT ─────────────────────────────────────────────── */
main {
  display: grid;
  grid-template-columns: 1fr 370px;
  gap: 0;
  max-width: 1120px;
  margin: 0 auto;
  padding: 20px 20px 0;
}

.canvas-col  { display: flex; flex-direction: column; gap: 14px; padding-right: 16px; }
.controls-col { display: flex; flex-direction: column; gap: 14px; }

/* ─── CANVAS WRAPPERS ────────────────────────────────────── */
.canvas-wrap {
  position: relative;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
}

.canvas-label {
  position: absolute;
  top: 9px; left: 12px;
  font-size: 9.5px;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  pointer-events: none;
  z-index: 2;
}

.canvas-overlay-br {
  position: absolute;
  bottom: 8px; right: 10px;
  font-size: 9px;
  color: var(--white);
  pointer-events: none;
  z-index: 2;
  text-align: right;
  line-height: 1.8;
}

canvas { display: block; }

/* ─── PANEL / CONTROLES ──────────────────────────────────── */
.panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 16px;
}

.panel-title {
  font-size: 9.5px;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ─── SLIDERS ────────────────────────────────────────────── */
.param-group { margin-bottom: 13px; }

.param-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 5px;
}

.param-name { color: var(--white); font-size: 10.5px; }
.param-sym  { font-style: italic; font-size: 12px; margin-left: 4px; }
.param-val  { color: var(--white); font-size: 11px; font-weight: 600; min-width: 60px; text-align: right; }

input[type="range"] {
  width: 100%; height: 3px;
  -webkit-appearance: none; appearance: none;
  background: var(--border);
  border-radius: 2px; outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--cyan); border: 2px solid var(--bg2);
  cursor: pointer; transition: transform 0.1s;
}
input[type="range"]:hover::-webkit-slider-thumb { transform: scale(1.25); }

.sl-ax1::-webkit-slider-thumb { background: var(--ax1); }
.sl-ax2::-webkit-slider-thumb { background: var(--ax2); }
.sl-ax3::-webkit-slider-thumb { background: var(--ax3); }

/* ─── PRESETS ────────────────────────────────────────────── */
.presets-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin: 14px 0 0;
}

.preset-btn {
  padding: 7px 4px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--white);
  font-family: var(--mono);
  font-size: 10px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
}
.preset-btn:hover { border-color: var(--cyan); color: var(--cyan); }

/* ─── CONDITION BOX ──────────────────────────────────────── */
.condition-box {
  margin-top: 14px;
  padding: 11px 13px;
  background: var(--bg3);
  border-radius: 6px;
  border: 1px solid var(--border);
}

.cond-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5px 0;
  font-size: 11px;
}
.cond-label { color: var(--white); font-size: 10.5px; }
.cond-val   { color: var(--white); font-weight: 600; }

.verdict-row {
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 8px;
  margin-top: 7px;
  border-top: 1px solid var(--border);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: color 0.3s;
}

/* ─── LEYENDA DE EJES ────────────────────────────────────── */
.axis-legend { display: flex; gap: 12px; margin-top: 10px; justify-content: center; }
.ax-tag { font-size: 9.5px; display: flex; align-items: center; gap: 4px; }
.ax-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

/* ─── BOTONES ────────────────────────────────────────────── */
.btn-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 14px; }

button {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text);
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
}
button:hover { border-color: var(--cyan); color: var(--cyan); }
button.primary { border-color: var(--cyan); color: var(--cyan); background: rgba(88,166,255,0.06); }

/* ─── SPEED SLIDER ───────────────────────────────────────── */
.speed-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-size: 10.5px;
  color: var(--white);
}
.speed-row input { flex: 1; }

/* ─── CÓDIGO FUENTE ──────────────────────────────────────── */
.code-section { max-width: 1120px; margin: 18px auto 40px; padding: 0 20px; }

.code-toggle-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}
.code-toggle-btn:hover { border-color: var(--cyan); color: var(--text); }
.code-icon { color: var(--cyan); font-size: 13px; }

.code-container {
  display: none;
  margin-top: 8px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 22px;
  overflow: auto;
  max-height: 650px;
}
.code-container.open { display: block; }

pre {
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.75;
  color: var(--text);
  white-space: pre;
  tab-size: 2;
}

/* ─── SCROLLBAR ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #2a3548; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #3b4d66; }