:root {
  --ink: #14221f;
  --muted: #5c6b66;
  --line: #d7e2dc;
  --paper: #f3f6f4;
  --card: #ffffff;
  --teal: #0e7c72;
  --teal-dark: #0b5e56;
  --sand: #f3e6cf;
  --danger: #8d341f;
  --danger-bg: #fde8e1;
  --shadow: 0 18px 40px rgba(20, 34, 31, 0.08);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

#how,
#why,
#features,
#faq {
  scroll-margin-top: 7.5rem;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(14, 124, 114, 0.08), transparent 32rem),
    var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  line-height: 1.6;
}

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

a {
  color: inherit;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 6vw;
  background: rgba(243, 246, 244, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(215, 226, 220, 0.8);
}

.brand,
.brand-foot {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a {
  text-decoration: none;
}

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

.hero,
.band {
  width: min(1080px, calc(100% - 10vw));
  margin: 0 auto;
}

.hero {
  padding: 4.5rem 0 3rem;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--teal-dark);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
}

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.25;
}

h1 {
  margin: 0;
  max-width: 14em;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.lede,
.section-head p,
.hint,
.site-footer p {
  color: var(--muted);
}

.lede {
  max-width: 38rem;
  margin: 1rem 0 1.6rem;
  font-size: 1.05rem;
}

.resolver-bar {
  display: flex;
  gap: 0.6rem;
  padding: 0.45rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.resolver-bar input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  padding: 0.75rem 1rem;
  color: var(--ink);
  font: inherit;
  outline: none;
}

button,
.download {
  border: 0;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
}

.primary,
.download {
  background: var(--teal);
  color: white;
  padding: 0.75rem 1.2rem;
}

.primary:hover,
.download:hover {
  background: var(--teal-dark);
}

.ghost {
  background: var(--sand);
  color: var(--ink);
  padding: 0.75rem 1rem;
}

.ghost:hover {
  filter: brightness(0.97);
}

button:disabled {
  opacity: 0.6;
  cursor: progress;
}

.hint {
  margin: 0.8rem 0 0;
  font-size: 0.92rem;
}

.message {
  margin: 0.9rem 0 0;
  padding: 0.75rem 1rem;
  border-radius: 12px;
}

.message.is-error {
  color: var(--danger);
  background: var(--danger-bg);
}

.message.is-loading,
.message.is-ok {
  color: var(--teal-dark);
  background: #e5f4f1;
}

.result {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.25rem;
  margin-top: 1.4rem;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.result img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  border-radius: 12px;
  background: #d7ebe6;
}

.result-kicker,
.result-author {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.result h2 {
  margin: 0.2rem 0 0.35rem;
  font-size: 1.35rem;
}

.downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.9rem;
}

.download.is-audio {
  background: transparent;
  color: var(--teal-dark);
  box-shadow: inset 0 0 0 1.5px var(--teal);
}

.download.is-audio:hover {
  background: #e5f4f1;
}

.band {
  padding: 1rem 0 3rem;
}

.band-plain {
  width: min(1080px, calc(100% - 10vw));
}

.section-head h2 {
  margin: 0;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 2rem;
}

.section-head p {
  margin: 0.4rem 0 1.3rem;
}

.steps,
.reasons,
.grid {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps {
  grid-template-columns: repeat(3, 1fr);
}

.steps li,
.reasons article,
.grid li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.2rem 1.1rem;
}

.steps span {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--sand);
  font-family: "Songti SC", "STSong", serif;
}

.steps h3,
.reasons h3,
.grid h3 {
  margin: 0.8rem 0 0.35rem;
  font-size: 1.1rem;
}

.steps p,
.reasons p,
.grid p,
.faq p {
  margin: 0;
  color: var(--muted);
}

.reasons {
  grid-template-columns: repeat(3, 1fr);
}

.grid {
  grid-template-columns: repeat(3, 1fr);
}

.grid h3 {
  margin-top: 0;
}

.faq {
  display: grid;
  gap: 0.7rem;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.9rem 1rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq p {
  margin-top: 0.6rem;
}

.site-footer {
  padding: 2rem 6vw 2.6rem;
  border-top: 1px solid var(--line);
}

.brand-foot {
  margin: 0 0 0.4rem;
}

.site-footer p:last-child {
  margin: 0;
  max-width: 40rem;
  font-size: 0.92rem;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

@media (max-width: 800px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .resolver-bar {
    flex-wrap: wrap;
    border-radius: 22px;
  }

  .resolver-bar input {
    flex-basis: 100%;
  }

  .primary,
  .ghost {
    flex: 1;
  }

  .result,
  .steps,
  .reasons,
  .grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.4rem;
  }
}