/* ============================================================
 * Splash screen — Modatorial.io intro animation
 * ============================================================ */

html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #000;
  color: #fff;
  font-family: system-ui, -apple-system, sans-serif;
  height: 100vh;
  width: 100vw;
  user-select: none;
}

#stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

/* ---------- panorama background ---------- */
#pano {
  position: absolute;
  inset: -10%;
  background: #050510;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.2s ease;
  transform: scale(1.06);
  animation: pan-drift 26s ease-in-out infinite alternate;
}
#pano.loaded   { opacity: 1; }
#pano.fade-out { opacity: 0; }

@keyframes pan-drift {
  0%   { transform: scale(1.06) translateX(0); }
  100% { transform: scale(1.06) translateX(-4%); }
}

#vig {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center,
              transparent 35%, rgba(0,0,0,0.8) 100%);
  pointer-events: none;
  z-index: 1;
}

/* ---------- falling / morphing letters ---------- */
#letters {
  position: absolute;
  left: 50%;
  top: 42%;
  transform: translate(-50%, -50%);
  z-index: 10;

  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: nowrap;              /* ← never wrap */
  white-space: nowrap;            /* ← never wrap */

  width: max-content;
  max-width: 96vw;

  font-family: 'Arial Black', 'Segoe UI Black', system-ui, sans-serif;
  font-weight: 900;
  font-size: min(7vw, 8.5vh);     /* ← viewport-aware, no clamping overflow */
  letter-spacing: 0.02em;

  user-select: none;
  pointer-events: none;
}

#letters span {
  display: inline-block;
  white-space: nowrap;            /* ← each letter never wraps */
  opacity: 0;
  color: #dcdcdc;
  will-change: transform, opacity;
}

/* ---------- logo (fades in above the letters) ---------- */
#splash-logo {
  position: absolute;
  left: 50%;
  top: 22%;
  transform: translate(-50%, -50%) scale(0.6);
  width: clamp(120px, 15vw, 200px);
  height: auto;
  opacity: 0;
  z-index: 15;
  pointer-events: none;
  filter: drop-shadow(0 0 24px rgba(120, 200, 255, 0.4));
  transition: opacity 0.7s ease, transform 0.9s cubic-bezier(0.22, 1.4, 0.36, 1);
}
#splash-logo.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/* ---------- final menu ---------- */
#menu {
  position: absolute;
  left: 50%;
  top: 58%;
  transform: translate(-50%, 20px);
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 14px;
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.34, 1.4, 0.64, 1);
  pointer-events: none;
}
#menu.show {
  opacity: 1;
  transform: translate(-50%, 0);
  pointer-events: auto;
}

#menu button {
  background: linear-gradient(180deg, rgba(16,185,129,0.96) 0%, rgba(5,150,105,0.96) 100%);
  color: #fff;
  border: 1px solid #00F5D4;
  padding: 15px 34px;
  font: 600 17px system-ui;
  letter-spacing: 0.5px;
  border-radius: 14px;
  cursor: pointer;
  min-width: 240px;
  transition: all 0.15s;
  text-align: center;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.15);
}
#menu button:hover {
  background: linear-gradient(180deg, rgba(52,211,153,0.98) 0%, rgba(16,185,129,0.98) 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,245,212,0.22), 0 0 0 1px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.25);
}
#menu button.secondary {
  background: linear-gradient(180deg, rgba(40,40,45,0.92) 0%, rgba(22,22,26,0.92) 100%);
  border-radius: 14px;
}
#menu button.secondary:hover {
  background: linear-gradient(180deg, rgba(70,70,78,0.95) 0%, rgba(40,40,48,0.95) 100%);
  box-shadow: 0 4px 16px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.15);
}

/* ---------- flash overlay ---------- */
#flash {
  position: fixed;
  inset: 0;
  background: #fff;
  opacity: 0;
  pointer-events: none;
  z-index: 50;
  transition: opacity 0.2s;
}

#skip {
  position: fixed;
  bottom: 20px;
  right: 24px;
  font-size: 12px;
  opacity: 0.4;
  color: #fff;
  z-index: 100;
  font-family: system-ui;
  letter-spacing: 1px;
}

/* ---------- modals (Credits / Readme) ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 40px 20px;
  box-sizing: border-box;
  opacity: 0;
  transition: opacity 0.25s;
}
.modal.show { display: flex; opacity: 1; }

.modal-inner {
  background: #12151b;
  border: 1px solid #2a2f38;
  border-radius: 12px;
  max-width: 720px;
  width: 100%;
  max-height: 82vh;
  overflow: auto;
  padding: 32px 40px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.7);
  transform: translateY(12px);
  transition: transform 0.3s cubic-bezier(0.34, 1.4, 0.64, 1);
}
.modal.show .modal-inner { transform: translateY(0); }

.modal-inner h2 {
  margin: 0 0 20px;
  font-size: 26px;
  border-bottom: 1px solid #2a2f38;
  padding-bottom: 14px;
}
.modal-inner h3 {
  color: #7dd;
  margin: 22px 0 8px;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.85;
}
.modal-inner p,
.modal-inner li {
  font-size: 14px;
  line-height: 1.6;
  opacity: 0.92;
}
.modal-inner a { color: #7bd; }
.modal-inner pre {
  background: #0a0c10;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.55;
  color: #cbd;
  border: 1px solid #1e242e;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.modal-close {
  float: right;
  background: none;
  border: 0;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 6px;
  transition: background 0.15s;
}
.modal-close:hover { background: rgba(255,80,80,0.15); color: #f88; }
.modal-inner ul { padding-left: 20px; }
.modal-inner code {
  background: #0a0c10;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
}

#modal-panorama-fallback {
  z-index: 300;
  background: rgba(4, 10, 20, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
#modal-panorama-fallback .pano-fallback-inner {
  max-width: 480px;
  padding: 28px;
  border-color: rgba(0, 245, 212, 0.42);
  background: linear-gradient(155deg, #1e293b 0%, #0f172a 70%);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.72), 0 0 36px rgba(0, 245, 212, 0.1);
}
.pano-fallback-inner h2 {
  margin-bottom: 10px;
  border-color: rgba(0, 245, 212, 0.2);
}
.pano-fallback-inner p {
  color: #b8c5d5;
  margin: 0 0 18px;
}
.pano-fallback-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}
.pano-fallback-options button,
.pano-gradient-choice > button {
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid rgba(0, 245, 212, 0.42);
  border-radius: 12px;
  background: rgba(0, 245, 212, 0.09);
  color: #e6edf3;
  font: 600 14px system-ui, sans-serif;
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}
.pano-fallback-options button:hover,
.pano-gradient-choice > button:hover {
  transform: translateY(-2px);
  border-color: #00F5D4;
  background: rgba(0, 245, 212, 0.16);
  box-shadow: 0 8px 22px rgba(0, 245, 212, 0.12);
}
.pano-gradient-choice {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 14px;
  background: rgba(8, 15, 28, 0.62);
}
.pano-gradient-choice label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #b8c5d5;
  font-size: 12px;
  font-weight: 600;
}
.pano-gradient-choice label span {
  display: flex;
  padding: 3px;
  border: 1px solid rgba(0, 245, 212, 0.35);
  border-radius: 8px;
  background: #0b1220;
}
.pano-gradient-choice input[type="color"] {
  width: 27px;
  height: 25px;
  padding: 0;
  border: 0;
  border-radius: 5px;
  background: transparent;
  cursor: pointer;
}
.pano-gradient-choice > button {
  min-height: 38px;
  font-size: 12px;
  white-space: nowrap;
}
@media (max-width: 480px) {
  .pano-gradient-choice { grid-template-columns: 1fr; }
  .pano-gradient-choice > button { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  #menu button,
  .pano-fallback-options button,
  .pano-gradient-choice > button { transition: none; }
}