/* Day 15 — Magnetic Cursor Trail */
/* Visual system: premium dark glass overlay over a luminous canvas scene. */

:root {
  color-scheme: dark;
  --bg: #050816;
  --bg-2: #0b1330;
  --panel: rgba(12, 18, 38, 0.56);
  --panel-border: rgba(255, 255, 255, 0.12);
  --panel-shadow: 0 24px 80px rgba(4, 8, 20, 0.55);
  --text: #f3f7ff;
  --text-soft: rgba(243, 247, 255, 0.7);
  --accent: #9fe8ff;
  --accent-2: #ff9eec;
  --accent-3: #ffd58f;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at 18% 18%, rgba(159, 232, 255, 0.14), transparent 26%),
    radial-gradient(circle at 80% 22%, rgba(255, 158, 236, 0.18), transparent 30%),
    radial-gradient(circle at 52% 78%, rgba(122, 154, 255, 0.14), transparent 32%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--text);
  font-family: "Sora", "Segoe UI", sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
}

.app-shell {
  position: relative;
  min-height: 100vh;
}

.scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.hud {
  position: fixed;
  inset: calc(1rem + env(safe-area-inset-top)) auto auto calc(1rem + env(safe-area-inset-left));
  z-index: 2;
  width: min(24rem, calc(100vw - 2rem - env(safe-area-inset-left) - env(safe-area-inset-right)));
  padding: 1.25rem;
  border: 1px solid var(--panel-border);
  border-radius: 1.5rem;
  background: var(--panel);
  backdrop-filter: blur(24px) saturate(150%);
  -webkit-backdrop-filter: blur(24px) saturate(150%);
  box-shadow: var(--panel-shadow);
  overflow: hidden;
}

.hud::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 0.16rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  opacity: 0.85;
}

.hud__eyebrow,
.hud__hint {
  margin: 0;
  color: var(--text-soft);
}

.hud__eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hud__badge {
  display: inline-flex;
  margin: 0.8rem 0 0;
  padding: 0.45rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-soft);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hud h1 {
  margin: 0.5rem 0 0;
  font-family: "Manrope", sans-serif;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.hud__lede {
  margin: 0.8rem 0 0;
  color: var(--text-soft);
  line-height: 1.6;
}

.hud__controls {
  margin-top: 1.25rem;
}

.toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.92rem;
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.04);
}

.toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle__ui {
  position: relative;
  flex: 0 0 3.4rem;
  height: 2rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 0 18px rgba(255, 255, 255, 0.05);
  transition: background 180ms ease, border-color 180ms ease;
}

.toggle__ui::after {
  content: "";
  position: absolute;
  top: 0.18rem;
  left: 0.2rem;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 50%;
  background: linear-gradient(145deg, #ffffff, #c6d4ff);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
  transition: transform 180ms ease;
}

.toggle input:checked + .toggle__ui {
  background: linear-gradient(120deg, rgba(159, 232, 255, 0.45), rgba(255, 158, 236, 0.45));
  border-color: rgba(255, 255, 255, 0.32);
}

.toggle input:checked + .toggle__ui::after {
  transform: translateX(1.35rem);
}

.hud__hint {
  margin-top: 0.85rem;
  font-size: 0.82rem;
  line-height: 1.5;
}

.no-script {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 2;
  margin: 0;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: rgba(8, 10, 19, 0.86);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  color: var(--text);
}

@media (max-width: 720px) {
  .hud {
    inset:
      auto
      calc(1rem + env(safe-area-inset-right))
      calc(1rem + env(safe-area-inset-bottom))
      calc(1rem + env(safe-area-inset-left));
    width: auto;
    padding: 1rem;
    border-radius: 1.25rem;
  }

  .hud h1 {
    font-size: clamp(1.75rem, 10vw, 2.35rem);
  }

  .hud__lede {
    font-size: 0.92rem;
  }

  .hud__badge {
    margin-top: 0.7rem;
  }
}

@media (pointer: coarse) {
  .toggle {
    padding: 1rem 1rem;
  }

  .hud__hint {
    font-size: 0.78rem;
  }
}