/* Importing Google Fonts - Nunito */
@import url("https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Nunito", sans-serif;
}

/* ---------- Theme tokens ---------- */
:root,
[data-theme="light"] {
  --bg: #eaf2ff;
  --bg-2: #fdf7e8;
  --card: #ffffff;
  --text: #13213f;
  --muted: #5f6f8f;
  --border: #d9e3f5;
  --accent: #f5a623;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0b1026;
  --bg-2: #1b1a4a;
  --card: #141a3a;
  --text: #e8ecff;
  --muted: #98a2c9;
  --border: #262e5c;
  --accent: #b9c3ff;
  color-scheme: dark;
}

body {
  min-height: 100vh;
  background: linear-gradient(180deg, var(--bg), var(--bg-2));
  color: var(--text);
  transition: background 0.5s, color 0.5s;
}

/* The circular reveal is done with the View Transitions API (script.js) */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

.page {
  display: grid;
  justify-items: center;
  max-width: 760px;
  margin: 0 auto;
  padding: 80px 20px;
}

/* ---------- Intro ---------- */
.intro {
  text-align: center;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.intro h1 {
  margin: 12px 0;
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.night-word,
[data-theme="dark"] .day-word {
  display: none;
}

[data-theme="dark"] .night-word {
  display: inline;
}

.intro p {
  max-width: 540px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.hero-toggle {
  margin: 54px 0 60px;
}

/* =========================================================
   The toggle — everything is in `em`, so --s scales it
   ========================================================= */
.dn-toggle {
  --s: 1;
  --ease: cubic-bezier(0.6, -0.25, 0.3, 1.3);
  position: relative;
  width: 5.6em;
  height: 2.4em;
  padding: 0;
  border: 0;
  border-radius: 999px;
  font-size: calc(var(--s) * 16px);
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  box-shadow:
    inset 0 0.12em 0.35em rgba(0, 0, 0, 0.3),
    0 0.6em 1.4em -0.5em rgba(19, 33, 63, 0.45);
  -webkit-tap-highlight-color: transparent;
}

.dn-toggle:focus-visible {
  outline: calc(var(--s) * 3px) solid var(--accent);
  outline-offset: calc(var(--s) * 3px);
}

/* Day and night skies, cross-faded */
.sky,
.sky::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, #3d9bff, #8fd0ff);
}

.sky::after {
  content: "";
  background: radial-gradient(circle at 70% 30%, #2d3592, #0b1026 75%);
  opacity: 0;
  transition: opacity 0.6s;
}

/* Stars (night only) */
.stars i {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: 0.18em;
  height: 0.18em;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0.3em #fff;
  opacity: 0;
  transform: scale(0);
  transition: opacity 0.4s, transform 0.4s;
}

/* Clouds (day only) */
.clouds i {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 -0.1em 0 rgba(0, 0, 0, 0.04) inset;
  transition: transform 0.6s var(--ease);
}

.clouds i:nth-child(1) {
  right: -0.3em;
  bottom: -0.6em;
  width: 1.9em;
  height: 1.9em;
}

.clouds i:nth-child(2) {
  right: 1.1em;
  bottom: -0.9em;
  width: 1.6em;
  height: 1.6em;
  transition-delay: 0.05s;
}

.clouds i:nth-child(3) {
  right: 2.1em;
  bottom: -1.1em;
  width: 1.4em;
  height: 1.4em;
  opacity: 0.85;
  transition-delay: 0.1s;
}

/* Sun → moon */
.knob {
  position: absolute;
  top: 0.3em;
  left: 0.3em;
  width: 1.8em;
  height: 1.8em;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff7b8, #ffc43d 60%, #ffab1f);
  box-shadow:
    0 0 0 0.35em rgba(255, 255, 255, 0.2),
    0 0 0 0.75em rgba(255, 255, 255, 0.1),
    0 0 0 1.2em rgba(255, 255, 255, 0.06),
    0.1em 0.15em 0.3em rgba(0, 0, 0, 0.25);
  transition: transform 0.6s var(--ease), background 0.6s, box-shadow 0.6s;
}

.crater {
  position: absolute;
  border-radius: 50%;
  background: #a8aec6;
  box-shadow: inset 0.06em 0.06em 0.1em rgba(0, 0, 0, 0.25);
  opacity: 0;
  transition: opacity 0.4s;
}

.c1 {
  top: 0.35em;
  left: 0.5em;
  width: 0.5em;
  height: 0.5em;
}

.c2 {
  top: 0.95em;
  left: 0.25em;
  width: 0.3em;
  height: 0.3em;
}

.c3 {
  top: 1em;
  left: 0.95em;
  width: 0.4em;
  height: 0.4em;
}

.dn-toggle:hover .knob {
  transform: translateX(0.15em);
}

/* ----- Night state ----- */
.dn-toggle[aria-checked="true"] .sky::after {
  opacity: 1;
}

.dn-toggle[aria-checked="true"] .knob {
  transform: translateX(3.2em);
  background: radial-gradient(circle at 35% 35%, #fbfcff, #d9ddee 65%, #c3c8dd);
  box-shadow:
    0 0 0 0.35em rgba(255, 255, 255, 0.08),
    0 0 0 0.75em rgba(255, 255, 255, 0.05),
    0 0 1.2em rgba(200, 210, 255, 0.5);
}

.dn-toggle[aria-checked="true"]:hover .knob {
  transform: translateX(3.05em);
}

.dn-toggle[aria-checked="true"] .crater {
  opacity: 1;
  transition-delay: 0.25s;
}

.dn-toggle[aria-checked="true"] .clouds i {
  transform: translateY(2em);
}

.dn-toggle[aria-checked="true"] .stars i {
  opacity: 1;
  transform: scale(1);
  transition-delay: 0.3s;
  animation: twinkle 2s var(--d) ease-in-out infinite;
}

@keyframes twinkle {
  50% {
    opacity: 0.3;
    transform: scale(0.6);
  }
}

/* ---------- Settings card ---------- */
.card {
  width: 100%;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 30px 70px -40px rgba(19, 33, 63, 0.35);
  transition: background 0.5s, border-color 0.5s;
}

.card h2 {
  font-size: 1.25rem;
  font-weight: 800;
}

.card p {
  margin-top: 4px;
  color: var(--muted);
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin: 22px 0 26px;
  padding: 6px;
  border-radius: 16px;
  background: color-mix(in srgb, var(--text) 6%, transparent);
}

.segmented button {
  padding: 12px 10px;
  border: 0;
  border-radius: 12px;
  background: none;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}

.segmented button[aria-checked="true"] {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 4px 14px -6px rgba(19, 33, 63, 0.4);
}

.segmented button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.sizes {
  display: flex;
  justify-content: space-around;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px dashed var(--border);
}

.size {
  display: grid;
  justify-items: center;
  gap: 10px;
}

.size small {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  .hero-toggle .dn-toggle {
    --s: 1.5 !important;
  }

  .segmented button {
    font-size: 0.85rem;
  }
}

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