:root {
  color-scheme: light;
  --audio-bg: #fff7fb;
  --audio-panel: #ffffff;
  --audio-text: #332a35;
  --audio-muted: #7b6f7d;
  --audio-line: #eadfe9;
  --audio-primary: #4f9f93;
  --audio-primary-dark: #31796f;
  --audio-accent: #e56f8f;
  --audio-soft-mint: #e7f8ef;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --audio-bg: #171319;
  --audio-panel: #211a22;
  --audio-text: #f7eef2;
  --audio-muted: #bcaeb8;
  --audio-line: #493944;
  --audio-primary: #79c7b8;
  --audio-primary-dark: #a1ded3;
  --audio-accent: #ff8bab;
  --audio-soft-mint: #1d352f;
}

* { box-sizing: border-box; }
.audio-converter-shell [hidden] { display: none !important; }

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  background:
    radial-gradient(circle at 8% 0%, rgba(255, 220, 234, .62), transparent 26%),
    radial-gradient(circle at 98% 100%, rgba(211, 247, 238, .68), transparent 30%),
    var(--audio-bg);
  color: var(--audio-text);
}

html[data-theme="dark"],
html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 8% 0%, rgba(92, 35, 55, .24), transparent 26%),
    radial-gradient(circle at 98% 100%, rgba(35, 91, 79, .20), transparent 30%),
    var(--audio-bg);
}

button,
select,
input { font: inherit; }

a { color: inherit; }

.audio-converter-loading {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: 3px;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

.audio-converter-loading.active { opacity: 1; }
.audio-converter-loading span {
  display: block;
  width: 42%;
  height: 100%;
  background: linear-gradient(90deg, #f58dae, #8ccfc3, #f7c96c);
  animation: audio-converter-loading 950ms ease-in-out infinite;
}

@keyframes audio-converter-loading {
  from { transform: translateX(-120%); }
  to { transform: translateX(260%); }
}

.audio-converter-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 36px;
}

.audio-converter-topbar {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 12px;
  border: 1px solid var(--audio-line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--audio-panel) 88%, transparent);
  backdrop-filter: blur(10px);
}

.audio-converter-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 24px;
}

.audio-converter-brand img { width: 44px; height: 44px; border-radius: 7px; }
.audio-converter-nav-actions { display: flex; align-items: center; gap: 8px; }
.audio-converter-nav-actions select { min-width: 112px; height: 36px; }

.audio-converter-icon-button {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--audio-line);
  border-radius: 7px;
  background: var(--audio-panel);
  color: var(--audio-text);
  cursor: pointer;
}

.audio-converter-hero { padding: 38px 20px 20px; }
.audio-converter-kicker {
  margin: 0 0 7px;
  color: var(--audio-accent);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.audio-converter-hero h1 {
  margin: 0;
  font-size: clamp(32px, 4.8vw, 52px);
  line-height: 1.08;
  letter-spacing: -.04em;
}

.audio-converter-summary {
  max-width: 760px;
  margin: 11px 0 18px;
  color: var(--audio-muted);
  line-height: 1.65;
}

.audio-converter-tools {
  width: fit-content;
  display: flex;
  gap: 5px;
  padding: 4px;
  border: 1px solid var(--audio-line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--audio-panel) 82%, transparent);
}

.audio-converter-tools a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 15px;
  border: 1px solid transparent;
  border-radius: 7px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 800;
}

.audio-converter-tools a[aria-current="page"] {
  border-color: color-mix(in srgb, var(--audio-primary) 42%, transparent);
  background: var(--audio-soft-mint);
  color: var(--audio-primary-dark);
}

.audio-converter-panel {
  padding: 18px;
  border: 1px solid var(--audio-line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--audio-panel) 94%, transparent);
  box-shadow: 0 18px 54px rgba(61, 42, 56, .08);
}

.audio-converter-trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 0 2px 14px;
  color: var(--audio-muted);
  font-size: 13px;
}

.audio-converter-trust-row span::before {
  content: "✓";
  margin-right: 6px;
  color: var(--audio-primary);
  font-weight: 900;
}

.audio-converter-form {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(330px, .96fr);
  gap: 18px;
}

.audio-converter-file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
}

.audio-converter-dropzone {
  width: 100%;
  min-height: 276px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 9px;
  padding: 26px;
  border: 1.5px dashed color-mix(in srgb, var(--audio-line) 84%, var(--audio-primary));
  border-radius: 10px;
  background: color-mix(in srgb, var(--audio-panel) 86%, transparent);
  color: var(--audio-text);
  cursor: pointer;
  text-align: center;
}

.audio-converter-dropzone.dragging {
  border-color: var(--audio-primary);
  background: var(--audio-soft-mint);
}

.audio-converter-upload-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(145deg, #ffe6ef, #e7f8ef);
  color: #a33151;
  font-size: 28px;
}

.audio-converter-dropzone strong { font-size: 17px; }
.audio-converter-dropzone small,
.audio-converter-source-label,
.audio-converter-limit,
.audio-converter-privacy { color: var(--audio-muted); }

.audio-converter-file-card {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--audio-line);
  border-radius: 9px;
  background: var(--audio-panel);
}

.audio-converter-file-card[hidden] { display: none; }
.audio-converter-file-card div { min-width: 0; }
.audio-converter-file-card strong,
.audio-converter-file-card span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.audio-converter-file-card span { margin-top: 4px; color: var(--audio-muted); font-size: 12px; }
.audio-converter-file-card button { border: 0; background: transparent; color: var(--audio-muted); cursor: pointer; font-size: 22px; }
.audio-converter-source-label { margin: 10px 2px 0; font-size: 12px; line-height: 1.55; }

.audio-converter-settings { padding: 2px; }
.audio-converter-settings h2 { margin: 0 0 15px; font-size: 18px; }
.audio-converter-field { display: grid; gap: 8px; margin-top: 13px; font-size: 13px; font-weight: 800; }
.audio-converter-field:first-of-type { margin-top: 0; }
.audio-converter-field select,
.audio-converter-more-format select {
  width: 100%;
  min-height: 44px;
  padding: 0 11px;
  border: 1px solid var(--audio-line);
  border-radius: 8px;
  background: var(--audio-panel);
  color: var(--audio-text);
}

.audio-converter-format-loading { min-height: 48px; display: grid; place-items: center; color: var(--audio-muted); font-weight: 500; }
.audio-converter-format-loading[hidden] { display: none; }
.audio-converter-format-buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
.audio-converter-format-buttons button {
  min-height: 48px;
  border: 1px solid var(--audio-line);
  border-radius: 8px;
  background: var(--audio-panel);
  color: var(--audio-text);
  cursor: pointer;
  font-weight: 850;
}

.audio-converter-format-buttons button.active {
  border-color: var(--audio-primary);
  background: var(--audio-soft-mint);
  color: var(--audio-primary-dark);
}

.audio-converter-more-format { display: grid; gap: 7px; margin-top: 10px; color: var(--audio-muted); font-size: 12px; }
.audio-converter-more-format[hidden] { display: none; }
.audio-converter-advanced-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }

.audio-converter-primary {
  width: 100%;
  min-height: 48px;
  margin-top: 18px;
  border: 0;
  border-radius: 9px;
  background: linear-gradient(135deg, #79c7b8, #4f9f93);
  color: #102f2b;
  cursor: pointer;
  font-weight: 900;
  box-shadow: 0 10px 24px rgba(49,121,111,.18);
}

.audio-converter-primary:disabled { cursor: not-allowed; opacity: .58; }
.audio-converter-limit { margin: 9px 0 0; font-size: 12px; text-align: center; }

.audio-converter-progress,
.audio-converter-result {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--audio-line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--audio-panel) 88%, var(--audio-soft-mint));
}

.audio-converter-progress[hidden],
.audio-converter-result[hidden] { display: none; }
.audio-converter-progress > div:first-child { display: flex; justify-content: space-between; gap: 12px; }
.audio-converter-progress-track { height: 8px; margin-top: 12px; overflow: hidden; border-radius: 999px; background: var(--audio-line); }
.audio-converter-progress-track span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--audio-accent), var(--audio-primary)); transition: width 180ms ease; }
.audio-converter-progress p { margin: 8px 0 0; color: var(--audio-muted); font-size: 13px; }

.audio-converter-result header { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.audio-converter-result h2 { margin: 0; font-size: 20px; }
.audio-converter-result header p { margin: 4px 0 0; color: var(--audio-muted); font-size: 13px; }
.audio-converter-result-check { width: 42px; height: 42px; display: grid; place-items: center; flex: none; border-radius: 50%; background: var(--audio-soft-mint); color: var(--audio-primary); font-size: 20px; font-weight: 900; }
.audio-converter-result-card { padding: 14px; border: 1px solid var(--audio-line); border-radius: 9px; background: var(--audio-panel); }
.audio-converter-result-card > strong { display: block; margin-bottom: 10px; }
.audio-converter-result-card audio { width: 100%; }
.audio-converter-result-actions { display: flex; justify-content: flex-end; gap: 9px; margin-top: 12px; }
.audio-converter-result-actions button,
.audio-converter-result-actions a { min-height: 42px; display: inline-flex; align-items: center; justify-content: center; padding: 0 15px; border-radius: 8px; font-weight: 850; text-decoration: none; cursor: pointer; }
.audio-converter-result-actions button { border: 1px solid var(--audio-line); background: var(--audio-panel); color: var(--audio-text); }
.audio-converter-result-actions a { background: linear-gradient(135deg, #79c7b8, #4f9f93); color: #102f2b; }

.audio-converter-message { min-height: 22px; margin-top: 10px; color: #cf4b59; font-size: 14px; }
.audio-converter-message.success { color: var(--audio-primary-dark); }
.audio-converter-privacy { margin: 4px 0 0; font-size: 12px; text-align: center; }
.audio-converter-footer { display: flex; justify-content: space-between; gap: 20px; padding: 22px 2px 0; color: var(--audio-muted); font-size: 12px; }
.audio-converter-footer nav { display: flex; gap: 15px; }
.audio-converter-footer a { text-decoration: none; }

@media (max-width: 780px) {
  .audio-converter-form { grid-template-columns: 1fr; }
  .audio-converter-hero { padding: 28px 8px 16px; }
  .audio-converter-dropzone { min-height: 220px; }
}

@media (max-width: 480px) {
  .audio-converter-shell { width: min(100% - 20px, 1160px); padding-top: 10px; }
  .audio-converter-topbar { padding: 8px; }
  .audio-converter-brand { font-size: 19px; }
  .audio-converter-brand img { width: 38px; height: 38px; }
  .audio-converter-nav-actions select { min-width: 0; width: 106px; }
  .audio-converter-panel { padding: 12px; }
  .audio-converter-tools { width: 100%; }
  .audio-converter-tools a { flex: 1; justify-content: center; padding: 0 8px; }
  .audio-converter-format-buttons { grid-template-columns: repeat(2, 1fr); }
  .audio-converter-advanced-grid { grid-template-columns: 1fr; }
  .audio-converter-result-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .audio-converter-footer { display: grid; }
}