/* BopoTaco — 站台樣式。
   顏色全部對齊 App 的 BopoColors.xcassets（docs/color-system.md）：
   indigo/accent、sunshine 系、ink、surface。深色值就是色票的 dark 值，
   所以網站與 App 在兩種外觀下看起來是同一個產品。
   英雄區的紺色漸層與 Tools/ShotComposer 的截圖底色相同（#14173B → #414BC1），
   商店截圖與網站因此接得上。 */

:root {
  color-scheme: light dark;

  --indigo: #414BC1;
  --indigo-ink: #FFFFFF;
  --navy: #14173B;
  --sunshine: #FAF095;
  --sunshine-ink: #171A45;
  --sunshine-wash: #F6EFD2;

  --ink: #27211B;
  --ink-2: #6E655C;
  --paper: #F7F5FB;
  --card: #FFFFFF;
  --key: #FFFFFF;
  --key-edge: #D9D2C8;
  --line: rgba(39, 33, 27, .12);
  --shadow: rgba(20, 23, 59, .10);

  --ok: #178A50;
  --mid: #C77500;
  --bad: #D62B22;

  --radius: 1.15rem;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
          "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --indigo: #7176CF;
    --indigo-ink: #EFF0FA;
    --sunshine: #F9DF85;
    --sunshine-wash: #14110A;

    --ink: #F5EFE7;
    --ink-2: #A89E93;
    --paper: #191512;
    --card: #272220;
    --key: #3B3531;
    --key-edge: #554C45;
    --line: rgba(245, 239, 231, .14);
    --shadow: rgba(0, 0, 0, .45);

    --ok: #3ECF8E;
    --mid: #FFB340;
    --bad: #FF5347;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.02rem;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--indigo); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }

.wrap { width: min(66rem, calc(100% - 2.5rem)); margin-inline: auto; }
.narrow { width: min(44rem, calc(100% - 2.5rem)); }

/* ---------- nav ---------- */

nav.top {
  display: flex; flex-wrap: wrap; gap: .75rem 1.5rem;
  align-items: baseline; justify-content: space-between;
  padding: 1.4rem 0;
}
.brand {
  color: inherit; text-decoration: none;
  font-size: 1.15rem; font-weight: 800; letter-spacing: -.02em;
}
a.brand::before {
  content: "ㄅ";
  display: inline-grid; place-items: center;
  width: 1.6em; height: 1.6em; margin-right: .45em;
  border-radius: .45em; vertical-align: -.45em;
  background: var(--indigo); color: var(--indigo-ink);
  font-size: .74em; font-weight: 600;
}
.langs { font-size: .92rem; color: var(--ink-2); }
.langs a { color: var(--ink-2); }
.langs [aria-current] { color: var(--ink); font-weight: 700; text-decoration: none; }

/* ---------- hero ---------- */

.hero {
  margin: .5rem 0 4rem;
  padding: clamp(2rem, 5vw, 3.75rem);
  border-radius: 1.75rem;
  background: linear-gradient(160deg, var(--navy), var(--indigo));
  color: #F5EFE7;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero h1 {
  margin: 0 0 1.1rem;
  text-wrap: balance; overflow-wrap: anywhere;
  font-size: clamp(2.1rem, 5.2vw, 3.5rem); line-height: 1.15;
  letter-spacing: -.03em; font-weight: 800;
}
.hero p { margin: 0; color: #D9D7EC; font-size: 1.08rem; }
.promises {
  display: flex; flex-wrap: wrap; gap: .5rem;
  margin: 1.6rem 0 0; padding: 0; list-style: none;
}
.promises li {
  padding: .3rem .8rem; border-radius: 2rem;
  background: rgba(245, 239, 231, .13);
  font-size: .88rem; font-weight: 600;
}

/* ---------- phone mock (no image assets: this is the app, drawn in CSS) ---------- */

.phone {
  width: min(19rem, 100%); margin-inline: auto; padding: .75rem .7rem 1rem;
  border-radius: 2.2rem; background: var(--card); color: var(--ink);
  box-shadow: 0 2rem 4rem rgba(0, 0, 0, .35);
}
.phone-bar {
  display: flex; justify-content: space-between;
  margin: .1rem .55rem .7rem; color: var(--ink-2);
  font-size: .72rem; font-weight: 700;
}
.phone .phone-title {
  margin: 0 0 .75rem; text-align: center;
  font-size: 1.35rem; font-weight: 800; letter-spacing: -.02em;
  color: var(--indigo);
}
.row {
  display: flex; align-items: center; gap: .6rem;
  margin-bottom: .45rem; padding: .6rem .7rem;
  border-radius: .8rem; background: var(--paper);
  font-size: .82rem;
}
.row.solid { background: var(--sunshine); color: var(--sunshine-ink); font-weight: 700; }
.row small { display: block; color: var(--ink-2); font-size: .72rem; font-weight: 500; }
.row.solid small { color: rgba(23, 26, 69, .7); }
.ring {
  flex: none; width: 2.6rem; height: 2.6rem; border-radius: 50%;
  display: grid; place-items: center;
  background: conic-gradient(var(--indigo) 0 70%, var(--line) 0);
  font-size: .62rem; font-weight: 800;
}
.ring span {
  display: grid; place-items: center;
  width: 2rem; height: 2rem; border-radius: 50%; background: var(--card);
}
.switch {
  display: grid; grid-template-columns: 1fr 1fr; gap: .25rem;
  margin-top: .7rem; padding: .25rem;
  border-radius: 2rem; background: var(--paper);
  font-size: .8rem; font-weight: 700; text-align: center;
}
.switch span { padding: .45rem; border-radius: 2rem; color: var(--ink-2); }
.switch .on { background: var(--indigo); color: var(--indigo-ink); }

/* ---------- sections ---------- */

section { padding: 3.5rem 0; }
h2 {
  margin: 0 0 .75rem;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem); line-height: 1.3;
  letter-spacing: -.02em; font-weight: 800;
}
.lead { max-width: 40rem; margin: 0; color: var(--ink-2); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 2rem; }
.card {
  padding: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card);
}
.card h3 { margin: 0 0 .4rem; font-size: 1.06rem; font-weight: 750; }
.card p { margin: 0; color: var(--ink-2); font-size: .96rem; }

/* zhuyin keyboard */
.keyboard {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(2.6rem, 1fr));
  gap: .4rem; margin-top: 2rem; padding: 1rem;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--card);
}
.keyboard span {
  display: grid; place-items: center; padding: .6rem 0;
  border-radius: .55rem; background: var(--key);
  box-shadow: 0 2px 0 var(--key-edge);
  font-size: 1.15rem;
}
.keyboard .tone { color: var(--indigo); font-size: 1.5rem; font-weight: 700; line-height: 1; }

/* accuracy heatmap */
.heat {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(2.4rem, 1fr));
  gap: .35rem; margin-top: 2rem; padding: 1rem;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--card);
}
.heat b {
  display: grid; place-items: center; gap: .1rem; padding: .45rem 0;
  border-radius: .5rem; font-size: 1.05rem; font-weight: 500;
  background: color-mix(in srgb, var(--ok) 18%, transparent);
  color: var(--ink);
}
.heat b i { font-size: .62rem; font-style: normal; color: var(--ink-2); }
.heat .m { background: color-mix(in srgb, var(--mid) 22%, transparent); }
.heat .l { background: color-mix(in srgb, var(--bad) 20%, transparent); }

/* free / pro */
.tiers { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2rem; }
.tier {
  padding: 1.6rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card);
}
.tier.pro { border-color: var(--sunshine); background: var(--sunshine-wash); }
.tier h3 { margin: 0 0 .2rem; font-size: 1.1rem; font-weight: 800; }
.tier .note { margin: 0 0 1rem; color: var(--ink-2); font-size: .9rem; }
.tier ul { margin: 0; padding-left: 1.15rem; color: var(--ink-2); }
.tier li { margin-bottom: .35rem; }
.tier li::marker { color: var(--indigo); }

.cta {
  margin-bottom: 3rem; padding: clamp(2rem, 4vw, 3rem); text-align: center;
  border-radius: 1.75rem; background: var(--sunshine); color: var(--sunshine-ink);
}
.cta h2 { margin-bottom: .5rem; }
.cta p { max-width: 34rem; margin: 0 auto; color: rgba(23, 26, 69, .78); }
.button {
  display: inline-block; margin-top: 1.5rem; padding: .75rem 1.9rem;
  border-radius: 2rem; background: var(--sunshine-ink); color: var(--sunshine);
  font-weight: 700; text-decoration: none;
}
.button:hover { opacity: .9; }

/* ---------- prose pages (support / privacy) ---------- */

.doc h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); letter-spacing: -.02em; margin: 0 0 .4rem; }
.doc .stamp { margin: 0 0 2.5rem; color: var(--ink-2); font-size: .92rem; }
.doc h2 {
  margin: 2.75rem 0 .5rem;
  font-size: 1.18rem; font-weight: 750; letter-spacing: 0;
}
.doc h2:first-of-type { margin-top: 2rem; }
.doc p { margin: 0 0 1rem; }
.doc strong { font-weight: 700; }
.callout {
  margin: 1.75rem 0; padding: 1.25rem 1.4rem;
  border-left: 4px solid var(--indigo); border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--card);
}
.callout p:last-child { margin-bottom: 0; }

/* ---------- footer ---------- */

footer {
  display: flex; flex-wrap: wrap; gap: .6rem 1.5rem; justify-content: space-between;
  margin-top: 2rem; padding: 2rem 0 3rem; border-top: 1px solid var(--line);
  color: var(--ink-2); font-size: .9rem;
}
footer a { color: var(--ink-2); }
.sources { margin: 0; padding-top: 1.5rem; color: var(--ink-2); font-size: .82rem; line-height: 1.6; }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; }
  .grid, .tiers { grid-template-columns: 1fr; }
}