/* ─────────────────────────────────────────────────────────────────────
   ByHuman — shared sticker-notebook theme
   Loaded by index.html, privacy.html, changelog.html, 404.html.
   Each page adds its own hero / content styling inline.
   ───────────────────────────────────────────────────────────────────── */

:root {
  /* Light "day" theme — soft pistachio notebook. */
  --paper: #E6E8CF;
  --paper-soft: #D4D7B8;
  --paper-warm: #F1F2E0;
  --ink: #1C1812;
  --ink-soft: #4A4339;
  --ink-mute: #8A816F;
  --line: rgba(28, 24, 18, 0.12);
  --line-hard: rgba(28, 24, 18, 0.22);

  --pink: #FF4FA3;
  --pink-soft: #FFD3E4;
  --mint: #3BC17C;
  --mint-soft: #C4F1D4;
  --honey: #FFB800;
  --honey-soft: #FFE7A3;
  --peri: #6E6CFF;
  --peri-soft: #D6D5FF;
  --cherry: #E6344A;
  --sky: #6EC6FF;

  --grain-alpha: 0.22;

  --display: "Bagel Fat One", "Fraunces", Georgia, serif;
  --serif-it: "Fraunces", Georgia, serif;
  --body: "DM Sans", system-ui, sans-serif;
  --hand: "Caveat", cursive;

  --radius-xl: 28px;
  --radius: 18px;
  --radius-sm: 10px;
  --max: 1040px;
  --gutter: 26px;
}

:root[data-theme="night"] {
  /* Night theme — cozy moon-notebook. */
  --paper: #1A1827;
  --paper-soft: #23213A;
  --paper-warm: #2A2344;
  --ink: #FFF6E3;
  --ink-soft: #D6CFB9;
  --ink-mute: #9A927C;
  --line: rgba(255, 246, 227, 0.14);
  --line-hard: rgba(255, 246, 227, 0.28);
  --pink: #FF7BC2;
  --pink-soft: #4A2145;
  --mint: #5BE7A6;
  --mint-soft: #1E4335;
  --honey: #FFD057;
  --honey-soft: #4A3A12;
  --peri: #A9A8FF;
  --peri-soft: #2E2B6A;
  --cherry: #FF6B7F;
  --sky: #7ED4FF;
  --grain-alpha: 0.14;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16.5px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: var(--pink); color: var(--paper); }

/* Warm radial puddles + noise grain — react to theme via vars. */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(60% 42% at 12% 8%, var(--honey-soft), transparent 70%),
    radial-gradient(56% 46% at 92% 16%, var(--pink-soft), transparent 72%),
    radial-gradient(70% 50% at 50% 108%, var(--mint-soft), transparent 70%);
  opacity: 0.9;
}
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='260' height='260'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.1' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.18  0 0 0 0 0.14  0 0 0 0 0.08  0 0 0 0.55 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/></svg>");
  mix-blend-mode: multiply;
  opacity: var(--grain-alpha);
}
:root[data-theme="night"] body::after {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='260' height='260'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.1' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.95  0 0 0 0 0.95  0 0 0 0 0.85  0 0 0 0.6 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/></svg>");
  mix-blend-mode: screen;
}

/* Floating background stickers. */
.sticker-bg {
  position: absolute;
  pointer-events: none;
  user-select: none;
  z-index: 1;
  filter: drop-shadow(2px 3px 0 var(--ink));
}
:root[data-theme="night"] .sticker-bg { filter: drop-shadow(2px 3px 0 rgba(0,0,0,0.6)); }
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(var(--rr, -4deg)); }
  50% { transform: translateY(-8px) rotate(calc(var(--rr, -4deg) + 2deg)); }
}

/* Page container. Pages may override --max in :root or inline. */
.wrap {
  position: relative;
  z-index: 3;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ──────────────────────────── Header ──────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0 0;
  gap: 14px;
  flex-wrap: wrap;
  position: relative;
  z-index: 60;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px 8px 12px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  font-family: var(--display);
  font-size: 22px;
  letter-spacing: 0.4px;
  text-decoration: none;
  transform: rotate(-2deg);
  box-shadow: 4px 4px 0 var(--honey);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.brand:hover { transform: rotate(-3deg) translateY(-2px); box-shadow: 5px 6px 0 var(--pink); }
.brand .wave {
  display: inline-block;
  transform-origin: 70% 70%;
  animation: wave 2.6s ease-in-out infinite;
}
@keyframes wave {
  0%, 60%, 100% { transform: rotate(0); }
  10% { transform: rotate(16deg); }
  20% { transform: rotate(-10deg); }
  30% { transform: rotate(14deg); }
  40% { transform: rotate(-8deg); }
  50% { transform: rotate(10deg); }
}

nav { display: inline-flex; gap: 8px; flex-wrap: wrap; align-items: center; }
nav a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1.5px solid var(--line-hard);
  color: var(--ink);
  font-family: var(--body);
  font-weight: 600;
  font-size: 13.5px;
  letter-spacing: 0.2px;
  text-decoration: none;
  background: transparent;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
nav a:nth-child(1):hover { background: var(--pink); color: var(--paper); border-color: var(--ink); transform: rotate(-2deg); }
nav a:nth-child(2):hover { background: var(--mint); color: var(--ink); border-color: var(--ink); transform: rotate(2deg); }
nav a:nth-child(3):hover { background: var(--peri); color: var(--paper); border-color: var(--ink); transform: rotate(-1.5deg); }

.night-toggle {
  appearance: none;
  background: var(--paper-soft);
  border: 1.5px solid var(--line-hard);
  color: var(--ink);
  border-radius: 999px;
  padding: 7px 12px 7px 10px;
  font-family: var(--body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: transform 0.18s ease, background 0.18s ease;
}
.night-toggle:hover { transform: rotate(-3deg) scale(1.04); background: var(--honey-soft); }
.night-toggle .bulb { font-size: 15px; line-height: 1; }

/* ──────────────────────────── Reveals ──────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(14px) rotate(var(--r, 0deg));
  animation: reveal 0.7s cubic-bezier(.2,.8,.2,1) forwards;
}
@keyframes reveal { to { opacity: 1; transform: translateY(0) rotate(var(--r, 0deg)); } }
.r-1 { animation-delay: 0.04s; }
.r-2 { animation-delay: 0.14s; }
.r-3 { animation-delay: 0.26s; }
.r-4 { animation-delay: 0.38s; }
.r-5 { animation-delay: 0.52s; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .sticker-bg, .brand .wave {
    animation: none !important;
  }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 640px) {
  header { padding-top: 20px; }
  nav a { padding: 7px 10px; font-size: 12.5px; }
}