/* ════════════════════════════════════════════════════════════
   main.css — reset, design tokens, global layout, settings btn
   ════════════════════════════════════════════════════════════ */

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Design Tokens ───────────────────────────────────────── */
:root {
  /* Gradient colors — overridden immediately by JS on load */
  --color-1: #1a7040;
  --color-2: #4db8c4;

  /* Animation timing — overridden by JS (default = speed 5) */
  --anim-duration:     19s;
  --rotation-duration: 22s;

  /* Modal surface */
  --modal-surface:  rgba(10, 10, 14, 0.6);
  --modal-border:   rgba(255, 255, 255, 0.08);
  --modal-divider:  rgba(255, 255, 255, 0.06);

  /* Text */
  --text-hi: rgba(255, 255, 255, 0.92);
  --text-lo: rgba(255, 255, 255, 0.42);

  /* Misc surface tints */
  --surface-tint: rgba(255, 255, 255, 0.10);

  /* Font */
  --font-mono: 'DM Mono', 'Courier New', monospace;
}

/* ── Body ────────────────────────────────────────────────── */
body {
  min-height: 100dvh;
  font-family: var(--font-mono);
  overflow: hidden;
}

/* ── Page content area (grows with future features) ──────── */
.page-main {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Icon Button (shared base — settings + guide) ────────── */
.icon-btn {
  /* Strip browser defaults */
  appearance: none;
  background: transparent;
  border: none;
  outline: none;
  padding: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  user-select: none;

  /* Shape */
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;

  /* Typography */
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1;
  color: rgba(255, 255, 255, 0.65);

  transition:
    color      0.18s ease,
    background 0.18s ease;
}

.icon-btn:hover,
.icon-btn[aria-expanded="true"] {
  color: var(--text-hi);
  background: var(--surface-tint);
}

.icon-btn:active {
  color: #fff;
  background: rgba(255, 255, 255, 0.22);
}

.icon-btn:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

/* ── Settings Button (position only) ────────────────────── */
.settings-btn {
  position: fixed;
  top: 22px;
  right: 26px;
  z-index: 100;
  letter-spacing: -0.02em;
}