:root {
  --bg: #f6f1e8;
  --bg-spot: #fff6e6;
  --bg-end: #e7ddcf;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-border: rgba(210, 197, 180, 0.6);
  --text: #1c1a18;
  --muted: #5a5248;
  --accent: #0f0f10;
  --accent-glow: rgba(28, 24, 19, 0.28);
  --ball: #fff7e6;
  --ball-border: #e2b57a;
  --shadow: rgba(0, 0, 0, 0.18);
}

* {
  box-sizing: border-box;
}

body[data-theme="dark"] {
  --bg: #0e0f12;
  --bg-spot: #1c1f26;
  --bg-end: #0a0b0e;
  --surface: rgba(22, 24, 30, 0.85);
  --surface-border: rgba(78, 84, 96, 0.6);
  --text: #f4f2ee;
  --muted: #b8b2a8;
  --accent: #f3f0ea;
  --accent-glow: rgba(12, 14, 18, 0.55);
  --ball: #24262d;
  --ball-border: #434a57;
  --shadow: rgba(4, 6, 12, 0.5);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Satoshi", "Manrope", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, var(--bg-spot), var(--bg) 55%, var(--bg-end));
  display: grid;
  place-items: center;
}

.app {
  width: min(720px, 92vw);
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 28px;
  padding: 42px 24px 48px;
  box-shadow: 0 22px 50px rgba(36, 30, 22, 0.18);
  backdrop-filter: blur(8px);
  position: relative;
}

.title {
  font-size: clamp(28px, 5vw, 44px);
  margin: 0 0 10px;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0 0 28px;
  font-size: clamp(14px, 2.6vw, 18px);
  color: var(--muted);
}

.balls {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.ball {
  width: clamp(56px, 12vw, 80px);
  height: clamp(56px, 12vw, 80px);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fffdf6, var(--ball) 55%, #f0d2a2);
  border: 1px solid var(--ball-border);
  display: grid;
  place-items: center;
  font-size: clamp(18px, 4vw, 28px);
  font-weight: 700;
  box-shadow: inset 0 4px 6px rgba(255, 255, 255, 0.8), 0 8px 16px var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ball.pop {
  animation: pop 0.45s ease var(--delay, 0s);
}

.cta {
  display: grid;
  place-items: center;
}

.btn {
  appearance: none;
  border: none;
  background: linear-gradient(135deg, #1f1c18, #2f2a24, #1a1713);
  color: #fef6e6;
  font-size: clamp(16px, 3vw, 20px);
  font-weight: 700;
  padding: 16px 36px;
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.02em;
  box-shadow: 0 18px 30px var(--accent-glow),
    inset 0 0 0 1px rgba(255, 248, 230, 0.16);
  transition: transform 0.2s ease, box-shadow 0.25s ease,
    filter 0.2s ease;
}

.btn:hover {
  transform: translateY(-3px);
  filter: brightness(1.06);
  box-shadow: 0 22px 36px var(--accent-glow),
    inset 0 0 0 1px rgba(255, 248, 230, 0.22);
}

.btn:active {
  transform: translateY(-1px) scale(0.99);
}

body[data-theme="dark"] .btn {
  background: linear-gradient(135deg, #f1ede6, #e4ddd2, #f7f4ee);
  color: #181a1f;
  box-shadow: 0 18px 30px rgba(12, 14, 18, 0.55),
    inset 0 0 0 1px rgba(24, 26, 32, 0.12);
}

body[data-theme="dark"] .btn:hover {
  filter: brightness(1.02);
  box-shadow: 0 22px 36px rgba(12, 14, 18, 0.6),
    inset 0 0 0 1px rgba(24, 26, 32, 0.2);
}

.theme-toggle {
  position: absolute;
  top: 18px;
  right: 18px;
  border: 1px solid var(--surface-border);
  background: transparent;
  color: var(--text);
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 999px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border 0.2s ease;
}

.theme-toggle:hover {
  background: rgba(0, 0, 0, 0.06);
}

body[data-theme="dark"] .theme-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}

@media (max-width: 480px) {
  .app {
    padding: 36px 18px 40px;
  }
  .balls {
    gap: 10px;
  }
}

@keyframes pop {
  0% {
    transform: translateY(8px) scale(0.9);
    box-shadow: inset 0 4px 6px rgba(255, 255, 255, 0.8), 0 6px 12px var(--shadow);
  }
  60% {
    transform: translateY(-6px) scale(1.05);
    box-shadow: inset 0 4px 6px rgba(255, 255, 255, 0.8), 0 14px 24px var(--shadow);
  }
  100% {
    transform: translateY(0) scale(1);
    box-shadow: inset 0 4px 6px rgba(255, 255, 255, 0.8), 0 8px 16px var(--shadow);
  }
}