/* ── ui.css — stile comune per Tentativo 2 ── */
/* Ispirato alla grafica di vixra divulgazione/ */

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

body {
  background: #000d1a;
  color: #e2e8f0;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 18px;
  line-height: 1.75;
  overflow: hidden;
  height: 100vh;
}

/* ── Canvas background (right side) ── */
#canvas, #main-canvas {
  position: fixed;
  top: 0; right: 0;
  height: 100%;
  z-index: 0;
}

/* ── Top UI bar ── */
#ui {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  background: rgba(0, 8, 20, 0.96);
  border-bottom: 1px solid rgba(14, 165, 233, 0.2);
  z-index: 200;
  gap: 10px;
}

#ui-title {
  font-size: 11px;
  color: #0ea5e9;
  letter-spacing: 3px;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}

#ui-phase {
  font-size: 12px;
  color: #94a3b8;
  text-align: center;
  flex: 1;
  line-height: 1.4;
  padding: 0 8px;
}

#ui-badge {
  background: #0d9488;
  color: #f0fdfa;
  font-size: 10px;
  font-family: 'Courier New', monospace;
  font-weight: bold;
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 1px;
}

/* ── Left text panel ── */
#panel {
  position: fixed;
  top: 52px;
  left: 0;
  width: min(600px, 44vw);
  height: calc(100vh - 52px - 52px);
  overflow-y: auto;
  z-index: 100;
  padding: 32px 36px 28px;
  background: rgba(0, 8, 20, 0.91);
  border-right: 1px solid rgba(14, 165, 233, 0.13);
  scrollbar-width: thin;
  scrollbar-color: rgba(14, 165, 233, 0.3) transparent;
}

#panel::-webkit-scrollbar { width: 4px; }
#panel::-webkit-scrollbar-track { background: transparent; }
#panel::-webkit-scrollbar-thumb { background: rgba(14, 165, 233, 0.3); border-radius: 2px; }

/* ── Phase content ── */
.phase-content { display: none; }
.phase-content.active { display: block; }

.phase-tag {
  font-size: 10px;
  font-family: 'Courier New', monospace;
  color: #0d9488;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.phase-title {
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  font-weight: normal;
  color: #e0f2fe;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: 0.01em;
}

.phase-body {
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  color: #cbd5e1;
  line-height: 1.85;
  max-width: 58ch;
}

.phase-body p { margin-bottom: 1em; }
.phase-body p:last-child { margin-bottom: 0; }

.phase-body ul {
  margin: 0.7em 0 0.9em 1.4em;
  line-height: 2;
}

.formula {
  font-family: 'Courier New', monospace;
  font-size: clamp(0.8rem, 1.2vw, 0.9rem);
  color: #7dd3fc;
  background: rgba(14, 165, 233, 0.07);
  padding: 11px 16px;
  border-left: 2px solid #0ea5e9;
  border-radius: 0 6px 6px 0;
  margin: 14px 0;
  display: block;
  line-height: 1.65;
  white-space: pre-line;
  overflow-x: auto;
}

.note {
  font-size: 0.82rem;
  color: #4a6080;
  font-style: italic;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(14, 165, 233, 0.1);
  line-height: 1.6;
}

.hl { color: #38bdf8; }
.am { color: #fbbf24; }
.gr { color: #4ade80; }

/* ── Bottom navigation ── */
#bottom {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0 10px;
  background: rgba(0, 8, 20, 0.96);
  border-top: 1px solid rgba(14, 165, 233, 0.2);
  z-index: 200;
  flex-wrap: wrap;
}

.btn, .phase-btn {
  padding: 5px 14px;
  border: 1px solid rgba(14, 165, 233, 0.28);
  background: rgba(14, 165, 233, 0.06);
  color: #7dd3fc;
  border-radius: 20px;
  cursor: pointer;
  font-size: 12px;
  font-family: 'Courier New', monospace;
  letter-spacing: 0.5px;
  transition: background 0.22s, border-color 0.22s, color 0.22s, box-shadow 0.22s;
  outline: none;
}

.btn:hover, .phase-btn:hover {
  background: rgba(14, 165, 233, 0.18);
  border-color: #0ea5e9;
  color: #e0f2fe;
}

.btn.active, .phase-btn.active {
  background: rgba(14, 165, 233, 0.22);
  border-color: #38bdf8;
  color: #e0f2fe;
  box-shadow: 0 0 10px -3px #0ea5e9;
}

.btn:focus-visible, .phase-btn:focus-visible {
  outline: 2px solid #38bdf8;
  outline-offset: 2px;
}

#btn-pause, #pauseBtn, #pause-btn, .btn-pause {
  border-color: rgba(245, 158, 11, 0.3);
  color: #fbbf24;
  background: rgba(245, 158, 11, 0.06);
  margin-left: 8px;
}

#btn-pause:hover, #pauseBtn:hover, #pause-btn:hover, .btn-pause:hover {
  background: rgba(245, 158, 11, 0.18);
  border-color: #f59e0b;
  color: #fef3c7;
}

/* ── Mobile layout ── */
@media (max-width: 820px) {
  body { overflow-y: auto; }

  #canvas, #main-canvas { position: fixed; width: 100%; }

  #panel {
    position: relative;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid rgba(14, 165, 233, 0.15);
    height: auto;
    max-height: 55vh;
    background: rgba(0, 8, 20, 0.94);
    padding: 20px 18px 16px;
  }

  #ui-title { display: none; }
  #ui-phase { text-align: left; }

  .phase-body { max-width: 100%; }

  #bottom { gap: 3px; }
  .btn { padding: 4px 10px; font-size: 11px; }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
}