/* 拼音转换器 — 样式（无外部依赖，含深色模式） */

:root {
  --bg: #f5f6fb;
  --bg-grad: radial-gradient(1200px 500px at 50% -10%, #e6e9ff 0%, transparent 60%);
  --card: #ffffff;
  --card-soft: #fafbff;
  --text: #16192b;
  --dim: #6b7280;
  --faint: #9aa1b2;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --accent-line: #c7cbfb;
  --border: #e5e7f0;
  --border-soft: #eef0f6;
  --shadow: 0 1px 2px rgba(22, 25, 43, .04), 0 12px 32px -12px rgba(22, 25, 43, .14);
  --radius: 16px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1016;
    --bg-grad: radial-gradient(1200px 500px at 50% -10%, #1c2044 0%, transparent 60%);
    --card: #161923;
    --card-soft: #12151d;
    --text: #e9ebf3;
    --dim: #9aa1b5;
    --faint: #7b8296;
    --accent: #8b93ff;
    --accent-soft: #1e2340;
    --accent-line: #3b4380;
    --border: #262a38;
    --border-soft: #20232f;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 18px 40px -18px rgba(0, 0, 0, .7);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg-grad), var(--bg);
  background-attachment: fixed;
  line-height: 1.6;
  font-size: 16px;
}

.wrap { width: min(1040px, 100% - 2rem); margin-inline: auto; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- 顶部 ---------- */

.site-header { padding: 1.1rem 0; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }

.brand { display: flex; align-items: center; gap: .55rem; font-weight: 700; letter-spacing: -.01em; }
.logo {
  width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  background: var(--accent); color: #fff; font-weight: 800; font-size: 1rem;
  box-shadow: 0 6px 14px -6px var(--accent);
}
.brand-name { font-size: 1.02rem; }

.site-nav { display: flex; gap: 1.15rem; }
.site-nav a { color: var(--dim); text-decoration: none; font-size: .9rem; }
.site-nav a:hover { color: var(--accent); }

@media (max-width: 620px) { .site-nav { display: none; } }

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

.hero { padding: 1.4rem 0 1.6rem; text-align: center; }
.hero h1 {
  margin: 0 0 .6rem; font-size: clamp(1.85rem, 5vw, 2.6rem);
  letter-spacing: -.03em; line-height: 1.2;
}
.hero p { margin: 0 auto; max-width: 46rem; color: var(--dim); font-size: 1.02rem; }

.badges {
  list-style: none; display: flex; flex-wrap: wrap; gap: .5rem;
  justify-content: center; padding: 0; margin: 1.1rem 0 0;
}
.badges li {
  font-size: .78rem; color: var(--dim); background: var(--card);
  border: 1px solid var(--border); border-radius: 999px; padding: .28rem .7rem;
}

/* ---------- 转换器卡片 ---------- */

.converter {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}

.pane { padding: 1rem 1.15rem; }
.pane-input { padding-bottom: .35rem; }
.pane-output { padding-top: .9rem; }

.pane-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: .75rem; flex-wrap: wrap; margin-bottom: .6rem;
}
.pane-label { font-size: .8rem; font-weight: 600; color: var(--faint); letter-spacing: .04em; }
.pane-actions { display: flex; align-items: center; gap: .4rem; flex-wrap: wrap; }
.counter { font-size: .78rem; color: var(--faint); font-variant-numeric: tabular-nums; }

textarea#input {
  display: block; width: 100%; min-height: 148px; resize: vertical;
  border: 0; outline: none; background: transparent; color: inherit;
  font-family: inherit; font-size: 1.18rem; line-height: 1.75; padding: 0;
}
textarea#input::placeholder { color: var(--faint); font-size: 1rem; }

/* ---------- 按钮 ---------- */

button { font-family: inherit; font-size: .84rem; cursor: pointer; }

.btn-ghost {
  background: transparent; border: 1px solid transparent; color: var(--dim);
  border-radius: 8px; padding: .28rem .55rem;
}
.btn-ghost:hover { background: var(--card-soft); border-color: var(--border); color: var(--text); }

.btn-primary {
  background: var(--accent); color: #fff; border: 1px solid transparent;
  border-radius: 9px; padding: .4rem 1rem; font-weight: 600;
  transition: transform .08s ease, opacity .15s ease;
}
.btn-primary:hover { opacity: .92; }
.btn-primary:active { transform: scale(.97); }
.btn-primary.is-done { background: #16a34a; }

/* ---------- 选项区 ---------- */

.options {
  background: var(--card-soft);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  padding: .85rem 1.15rem;
  display: grid; gap: .6rem;
}

.opt-row { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; }
.opt-name {
  flex: 0 0 3.6rem; font-size: .82rem; font-weight: 600; color: var(--dim);
  letter-spacing: .02em;
}

.segmented {
  display: inline-flex; flex-wrap: wrap; gap: 3px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 11px; padding: 3px;
}
.segmented button {
  display: inline-flex; flex-direction: column; align-items: center; line-height: 1.25;
  border: 0; background: transparent; color: var(--dim);
  border-radius: 8px; padding: .3rem .68rem; white-space: nowrap;
  transition: background .12s ease, color .12s ease;
}
.segmented button .hint {
  font-size: .68rem; color: var(--faint); font-family: var(--mono); margin-top: 1px;
}
.segmented button:hover { background: var(--accent-soft); color: var(--text); }
.segmented button.is-active { background: var(--accent); color: #fff; }
.segmented button.is-active .hint { color: rgba(255, 255, 255, .82); }

.segmented-check { padding: 3px; }
.check-btn { flex-direction: row !important; gap: .4rem; align-items: center !important; }
.check-btn .tick {
  width: 15px; height: 15px; border-radius: 4px; border: 1.5px solid var(--border);
  display: grid; place-items: center; font-size: .68rem; color: transparent;
  background: var(--card-soft); flex: 0 0 auto;
}
.check-btn[aria-checked="true"] { background: var(--accent); color: #fff; }
.check-btn[aria-checked="true"] .hint { color: rgba(255, 255, 255, .82); }
.check-btn[aria-checked="true"] .tick {
  background: rgba(255, 255, 255, .95); border-color: transparent; color: var(--accent);
}

/* ---------- 输出区 ---------- */

.tabs { display: inline-flex; gap: 2px; background: var(--card-soft); border: 1px solid var(--border); border-radius: 10px; padding: 3px; }
.tabs button {
  border: 0; background: transparent; color: var(--dim); border-radius: 7px;
  padding: .28rem .8rem; font-weight: 500;
}
.tabs button.is-active { background: var(--card); color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, .07); }

.out-box { position: relative; min-height: 168px; }

.out-text {
  margin: 0; min-height: 168px; white-space: pre-wrap; word-break: break-word;
  font-family: var(--mono); font-size: 1.12rem; line-height: 1.95;
  color: var(--text); outline: none;
}
.out-text:empty { min-height: 168px; }

.out-ruby {
  min-height: 168px; white-space: pre-wrap; word-break: break-word;
  font-size: 1.5rem; line-height: 2.5; color: var(--text);
  padding-top: .35rem;
}
.out-ruby ruby { ruby-position: over; margin-right: .12em; }
.out-ruby rt {
  font-family: var(--mono); font-size: .46em; color: var(--accent);
  font-weight: 500; letter-spacing: -.01em; line-height: 1.1;
}
.out-ruby .non-han { font-size: .8em; color: var(--dim); }

.empty-tip {
  position: absolute; inset: 0; display: grid; place-items: center;
  margin: 0; color: var(--faint); font-size: .95rem; pointer-events: none;
}
.empty-tip[hidden] { display: none; }

.out-note { margin: .55rem 0 0; font-size: .76rem; color: var(--faint); }

/* ---------- 说明区 ---------- */

.features { padding: 2.6rem 0 .5rem; }
.features h2 { font-size: 1.3rem; letter-spacing: -.02em; margin: 0 0 1rem; }

.steps { list-style: none; counter-reset: s; padding: 0; margin: 0; display: grid; gap: .9rem; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li {
  counter-increment: s; background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1rem 1.1rem;
}
.steps li::before {
  content: counter(s); display: grid; place-items: center;
  width: 24px; height: 24px; border-radius: 7px; background: var(--accent-soft);
  color: var(--accent); font-size: .8rem; font-weight: 700; margin-bottom: .5rem;
}
.steps b { display: block; margin-bottom: .2rem; }
.steps span { color: var(--dim); font-size: .88rem; }

.faq { margin: 0; display: grid; gap: .15rem; }
.faq dt { font-weight: 600; padding-top: .85rem; }
.faq dd { margin: 0; color: var(--dim); font-size: .92rem; }

.site-footer {
  margin-top: 3rem; padding: 1.6rem 0 2.4rem;
  border-top: 1px solid var(--border);
}
.site-footer p { margin: 0; color: var(--faint); font-size: .82rem; text-align: center; }

/* ---------- 复制反馈 ---------- */

.toast {
  position: fixed; left: 50%; bottom: 1.6rem; transform: translate(-50%, 1.2rem);
  background: var(--text); color: var(--bg); font-size: .84rem;
  padding: .5rem 1rem; border-radius: 999px; opacity: 0;
  transition: opacity .18s ease, transform .18s ease; pointer-events: none; z-index: 50;
}
.toast.is-on { opacity: .95; transform: translate(-50%, 0); }

@media (max-width: 520px) {
  .opt-name { flex-basis: 100%; }
  .segmented button { padding: .3rem .55rem; }
  .segmented button .hint { display: none; }
  textarea#input { font-size: 1.08rem; }
}