:root {
  --bg:        #0b0712;
  --bg-2:      #140a22;
  --violet:    #8b5cf6;
  --violet-2:  #a855f7;
  --magenta:   #d946ef;
  --cyan:      #22d3ee;
  --text:      #e9e3ff;
  --muted:     #9a8cc4;
  --field-bg:  rgba(139, 92, 246, 0.08);
  --border:    rgba(168, 85, 247, 0.35);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  min-height: 100%;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, var(--bg-2), transparent 60%),
    radial-gradient(900px 500px at 0% 110%, #1a0d2e, transparent 55%),
    var(--bg);
  overflow-x: hidden;
  position: relative;
}

/* decorative layers */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 40%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}
.glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
  animation: float 14s ease-in-out infinite;
}
.glow-a { width: 420px; height: 420px; background: var(--violet); top: -120px; left: -80px; }
.glow-b { width: 380px; height: 380px; background: var(--magenta); bottom: -140px; right: -60px; animation-delay: -7s; }
@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  50%      { transform: translateY(40px) translateX(20px); }
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(28px, 6vw, 72px) clamp(16px, 4vw, 40px) 64px;
}

/* hero */
.hero { text-align: center; margin-bottom: 36px; }
.title {
  font-size: clamp(40px, 9vw, 86px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
  text-transform: uppercase;
  background: linear-gradient(120deg, #fff 0%, var(--violet-2) 45%, var(--magenta) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 60px rgba(168, 85, 247, 0.45);
}
.title-accent {
  background: linear-gradient(120deg, var(--cyan), var(--violet-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle {
  margin-top: 14px;
  font-size: clamp(13px, 2.4vw, 17px);
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

/* controls */
.controls {
  display: flex;
  gap: 12px;
  max-width: 720px;
  margin: 0 auto;
}
.field {
  flex: 1;
  min-width: 0;
  padding: 14px 18px;
  font-size: 15px;
  color: var(--text);
  background: var(--field-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
.field::placeholder { color: var(--muted); }
.field:focus {
  border-color: var(--violet-2);
  background: rgba(139, 92, 246, 0.14);
  box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.18), 0 0 24px rgba(168, 85, 247, 0.25);
}
.btn {
  flex-shrink: 0;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  cursor: pointer;
  border: none;
  border-radius: 12px;
  background: linear-gradient(120deg, var(--violet) 0%, var(--magenta) 100%);
  box-shadow: 0 8px 24px rgba(168, 85, 247, 0.4);
  transition: transform 0.12s, box-shadow 0.2s, filter 0.2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(168, 85, 247, 0.55); filter: brightness(1.08); }
.btn:active { transform: translateY(0); }

.hint {
  max-width: 720px;
  margin: 12px auto 0;
  min-height: 18px;
  font-size: 13px;
  color: var(--magenta);
  text-align: center;
}

/* 16:9 stage */
.stage-wrap { margin-top: 28px; }
.stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #0d0818;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(168, 85, 247, 0.12) inset;
}
.frame { width: 100%; height: 100%; border: 0; display: block; background: #fff; }
.placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--muted);
  font-size: 15px;
  text-align: center;
  padding: 24px;
  background:
    radial-gradient(600px 300px at 50% 40%, rgba(139, 92, 246, 0.12), transparent 70%),
    #0d0818;
}
.ph-icon {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  font-size: 24px;
  color: #fff;
  background: linear-gradient(120deg, var(--violet), var(--magenta));
  box-shadow: 0 0 40px rgba(168, 85, 247, 0.5);
}
.placeholder.hidden { display: none; }

@media (max-width: 560px) {
  .controls { flex-direction: column; }
  .btn { width: 100%; }
}