:root {
  --bg: #0e0e11;
  --surface: #16161b;
  --surface-2: #1d1d24;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #f2f2f5;
  --text-dim: #a2a2ae;
  --text-faint: #6c6c78;

  --primary: #a78bfa;
  --casual: #5eb8ff;
  --extreme: #ff9a5c;
  --danger: #f07178;

  --theme: var(--primary);
  --radius: 14px;
  --radius-sm: 10px;
  --ease: 0.18s ease;
}

body.mode-casual  { --theme: var(--casual); }
body.mode-extreme { --theme: var(--extreme); }

* {
  box-sizing: border-box;
  font-family: 'Outfit', system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

html { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

h1 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.back-btn {
  display: inline-block;
  padding: 8px 14px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: color var(--ease), border-color var(--ease);
}
.back-btn:hover { color: var(--text); border-color: var(--border-strong); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.btn-base,
.mode-btn,
.btn {
  font: inherit;
  font-weight: 600;
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}
.mode-btn:hover,
.btn:hover { color: var(--text); border-color: var(--border-strong); }

.mode-btn.active,
.btn.active {
  color: var(--text);
  background: color-mix(in srgb, var(--theme) 18%, var(--surface-2));
  border-color: var(--theme);
}

input[type="number"],
input[type="text"],
textarea,
select {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--ease);
}
input[type="number"]:focus,
input[type="text"]:focus,
textarea:focus,
select:focus { border-color: var(--theme); }

::placeholder { color: var(--text-faint); }

:focus-visible { outline: 2px solid var(--theme); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible { outline: none; }

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.btn-base,
.mode-btn,
.btn,
.back-btn {
  transition: color var(--ease), background var(--ease), border-color var(--ease), transform 0.12s ease;
}
.mode-btn:active,
.btn:not(:disabled):active,
.back-btn:active { transform: scale(0.96); }

body::before,
body::after {
  content: '';
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  pointer-events: none;
  z-index: -1;
  will-change: transform;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 25%, #000 75%, transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 25%, #000 75%, transparent);
}
body::before {
  height: calc(100vh + 480px);
  background-size: 480px 480px;
  background-image:
    radial-gradient(circle at 12% 18%, color-mix(in srgb, var(--theme) 14%, transparent) 0 2.5px, transparent 3.5px),
    radial-gradient(circle at 47% 62%, color-mix(in srgb, var(--theme) 12%, transparent) 0 2px,   transparent 3px),
    radial-gradient(circle at 78% 33%, color-mix(in srgb, var(--theme) 14%, transparent) 0 3px,   transparent 4px),
    radial-gradient(circle at 63% 90%, color-mix(in srgb, var(--theme) 10%, transparent) 0 2px,   transparent 3px),
    radial-gradient(circle at 90% 75%, color-mix(in srgb, var(--theme) 12%, transparent) 0 2.5px, transparent 3.5px),
    radial-gradient(circle at 30% 85%, color-mix(in srgb, var(--theme) 10%, transparent) 0 2px,   transparent 3px);
  animation: dots-rise 70s linear infinite;
}
body::after {
  height: calc(100vh + 320px);
  background-size: 320px 320px;
  background-image:
    radial-gradient(circle at 25% 40%, color-mix(in srgb, var(--text) 7%, transparent) 0 1px,   transparent 2px),
    radial-gradient(circle at 70% 15%, color-mix(in srgb, var(--text) 5%, transparent) 0 1.5px, transparent 2.5px),
    radial-gradient(circle at 55% 78%, color-mix(in srgb, var(--text) 6%, transparent) 0 1px,   transparent 2px),
    radial-gradient(circle at 88% 55%, color-mix(in srgb, var(--text) 5%, transparent) 0 1.5px, transparent 2.5px);
  animation: dots-rise-fast 45s linear infinite;
}
@keyframes dots-rise      { to { transform: translateY(-480px); } }
@keyframes dots-rise-fast { to { transform: translateY(-320px); } }