:root {
  --bg: #f4f3ee;
  --surface: #ffffff;
  --ink: #16180f;
  --muted: #5d6157;
  --line: #dddcd3;
  --button: #16180f;
  --button-ink: #ffffff;

  /* LCD 的配色和 app 裡一樣，不跟著深色模式變。 */
  --lcd-bg: #9dad86;
  --lcd-on: #2a3225;
  --lcd-off: #94a47e;
  --lcd-bezel: #c9d2b8;

  --radius: 22px;
  --max: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121310;
    --surface: #1d1f1a;
    --ink: #f1f2ec;
    --muted: #a5a99d;
    --line: #2e3129;
    --button: #f1f2ec;
    --button-ink: #121310;
    --lcd-bezel: #2e3329;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #121310;
  --surface: #1d1f1a;
  --ink: #f1f2ec;
  --muted: #a5a99d;
  --line: #2e3129;
  --button: #f1f2ec;
  --button-ink: #121310;
  --lcd-bezel: #2e3329;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}

@media (min-width: 720px) {
  .wrap { padding: 0 32px; }
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(150%) blur(12px);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 19px;
  text-decoration: none;
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 7px;
}

.nav {
  display: flex;
  gap: 22px;
  font-size: 15px;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
}

.nav a:hover { color: var(--ink); }

@media (max-width: 560px) {
  .nav .optional { display: none; }
}

/* ---------- Buttons ---------- */

.store-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--button);
  color: var(--button-ink);
  font-weight: 600;
  font-size: 17px;
  text-decoration: none;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.store-button:hover { transform: translateY(-1px); }

.store-button svg {
  width: 20px;
  height: 20px;
  flex: none;
}

.store-button[aria-disabled="true"] {
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}

.store-note {
  margin: 12px 0 0;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- Hero ---------- */

.hero {
  padding: 56px 0 72px;
}

.hero .wrap {
  display: grid;
  gap: 48px;
  align-items: center;
}

@media (min-width: 880px) {
  .hero { padding: 88px 0 104px; }
  .hero .wrap { grid-template-columns: 1.05fr 0.95fr; }
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(38px, 6.4vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.025em;
}

.lede {
  margin: 0 0 32px;
  font-size: 19px;
  color: var(--muted);
  max-width: 34em;
}

/* ---------- LCD ---------- */

.lcd {
  background: var(--lcd-bg);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: 0 0 0 10px var(--lcd-bezel);
}

.lcd canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
}

.hero-lcd {
  max-width: 440px;
  width: 100%;
  margin: 10px auto;
  cursor: pointer;
}

.hero-lcd-caption {
  margin: 26px 0 0;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- Sections ---------- */

section { scroll-margin-top: 72px; }

.section {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 28px;
  font-size: clamp(30px, 4.4vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.section .intro {
  margin: 0 0 40px;
  font-size: 18px;
  color: var(--muted);
  max-width: 38em;
}

/* Features */

.features {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.feature {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
}

.feature h3 {
  margin: 0;
  font-size: 18px;
}

.feature p {
  margin: 0;
  font-size: 16px;
  color: var(--muted);
}

.feature .icon {
  display: block;
  width: 28px;
  height: 28px;
  margin-bottom: 14px;
  color: var(--ink);
}

/* Characters */

.characters {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, 1fr);
}

@media (min-width: 880px) {
  .characters { grid-template-columns: repeat(6, 1fr); }
}

.character {
  margin: 0;
  text-align: center;
}

.character .lcd {
  padding: 8px;
  box-shadow: none;
  border-radius: 16px;
  cursor: pointer;
}

.character figcaption {
  margin-top: 10px;
  font-weight: 600;
}

/* Screens */

.screens {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 16px;
  margin: 0 -16px;
  padding-left: 16px;
  padding-right: 16px;
}

@media (min-width: 720px) {
  .screens { margin: 0; padding-left: 0; padding-right: 0; }
}

.screen {
  flex: 0 0 auto;
  width: min(62vw, 240px);
  margin: 0;
  scroll-snap-align: start;
}

.screen img {
  width: 100%;
  border-radius: 26px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.screen figcaption {
  margin-top: 10px;
  font-size: 15px;
  color: var(--muted);
  text-align: center;
}

/* Privacy */

.promises {
  display: grid;
  gap: 12px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .promises { grid-template-columns: repeat(2, 1fr); }
}

.promises li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 17px;
}

.promises li::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  background: var(--lcd-on);
  box-shadow: 0 0 0 3px var(--lcd-bg);
  transform: translateY(-2px);
}

.text-link {
  font-weight: 600;
  text-underline-offset: 3px;
}

/* Closing CTA */

.closing {
  text-align: center;
}

.closing .intro {
  margin-left: auto;
  margin-right: auto;
}

/* Footer */

.site-footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}

.site-footer nav {
  display: flex;
  gap: 20px;
}

.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

/* ---------- Privacy page ---------- */

.doc {
  max-width: 720px;
  padding-top: 56px;
  padding-bottom: 72px;
}

.doc h1 {
  font-size: clamp(34px, 5.4vw, 48px);
}

.doc h2 {
  margin: 40px 0 8px;
  font-size: 22px;
}

.doc p,
.doc li {
  color: var(--muted);
}

.doc .updated {
  margin-top: -8px;
  font-size: 15px;
}

.doc .contact {
  margin-top: 16px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.doc .contact p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  .store-button { transition: none; }
  .store-button:hover { transform: none; }
}