:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #20242d;
  --text: #f4f6f8;
  --muted: #b5bcc8;
  --accent: #66d9b8;
  --accent-dark: #09251d;
  --line: #303642;
  --max: 1180px;
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 88% 5%, rgba(102,217,184,.12), transparent 27%),
    linear-gradient(180deg, #0d0f13, var(--bg));
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}
button, input { font: inherit; }
button { color: inherit; }
a { color: inherit; }
.wrap { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15,17,21,.86);
  border-bottom: 1px solid rgba(255,255,255,.07);
  backdrop-filter: blur(14px);
}
.nav { min-height: 62px; display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.brand { font-size: 1.25rem; font-weight: 800; letter-spacing: .02em; text-decoration: none; }
.brand span { color: var(--accent); }
.nav-links { display: flex; flex-wrap: wrap; gap: 22px; font-size: .96rem; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

.hero { padding: 80px 0 56px; display: grid; grid-template-columns: 1.15fr .85fr; gap: 54px; align-items: end; }
.eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  padding: 7px 11px;
  color: var(--accent);
  background: rgba(102,217,184,.12);
  border: 1px solid rgba(102,217,184,.25);
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 700;
}
h1 { margin: 0; font-size: clamp(3rem, 7vw, 5.8rem); line-height: .94; letter-spacing: -.055em; }
h1 em { color: var(--accent); font-family: Georgia, serif; font-weight: 400; }
.lead { margin: 0 0 4px; color: var(--muted); font: 1.12rem/1.65 Georgia, serif; }

.tool-section { padding: 0 0 28px; }
.tool-grid {
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  background: var(--panel);
  border: 1px solid rgba(102,217,184,.48);
  border-radius: var(--radius);
  box-shadow: 0 28px 80px rgba(0,0,0,.32);
}
.tool-panel { padding: clamp(24px, 3.6vw, 48px); min-width: 0; }
.settings-panel { background: var(--panel-2); border-left: 1px solid var(--line); }
.panel-title { display: flex; align-items: center; gap: 11px; margin-bottom: 25px; color: var(--text); font-size: .74rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.panel-title > span { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid var(--muted); border-radius: 50%; font-size: .68rem; }
.panel-title > b { min-width: 24px; margin-left: auto; padding: 4px 8px; text-align: center; color: var(--accent-dark); background: var(--accent); border-radius: 999px; }

.dropzone {
  min-height: 185px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 26px;
  text-align: center;
  background: rgba(102,217,184,.045);
  border: 2px dashed rgba(102,217,184,.45);
  border-radius: 15px;
  cursor: pointer;
  transition: .18s ease;
}
.dropzone:hover, .dropzone.dragging, .dropzone:focus-visible { background: rgba(102,217,184,.1); border-color: var(--accent); outline: none; transform: translateY(-2px); }
.upload-icon { width: 45px; height: 45px; display: grid; place-items: center; margin-bottom: 11px; color: var(--accent); background: rgba(102,217,184,.12); border: 1px solid rgba(102,217,184,.28); border-radius: 50%; font-size: 1.5rem; font-weight: 900; }
.dropzone strong { font-size: 1.05rem; }
.dropzone small { color: var(--muted); }
.dropzone .privacy-note { margin-top: 8px; color: var(--accent); font-size: .72rem; letter-spacing: .04em; text-transform: uppercase; }

.queue-heading { display: flex; align-items: center; justify-content: space-between; margin-top: 24px; padding-bottom: 10px; color: var(--muted); border-bottom: 1px solid var(--line); font-size: .7rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.queue-heading button { padding: 0; color: var(--accent); background: none; border: 0; cursor: pointer; font-size: .68rem; font-weight: 800; text-transform: uppercase; }
.queue { max-height: 510px; overflow-y: auto; scrollbar-width: thin; }
.queue-empty { min-height: 96px; display: grid; place-items: center; color: #727985; font-size: .73rem; letter-spacing: .08em; text-transform: uppercase; }
.file-row { display: grid; grid-template-columns: 34px minmax(0,1fr) auto; gap: 11px; align-items: start; padding: 14px 3px; border-bottom: 1px solid var(--line); }
.file-row.processing { background: rgba(102,217,184,.035); }
.file-index { padding-top: 3px; color: #767d88; font: .7rem/1 monospace; }
.file-main { min-width: 0; }
.file-main strong { display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-size: .86rem; }
.file-main small { display: block; margin-top: 4px; color: var(--muted); font: .68rem/1.4 monospace; }
.file-main audio { width: min(100%, 430px); height: 34px; margin-top: 9px; display: block; }
.row-progress { height: 3px; display: block; margin-top: 8px; overflow: hidden; background: #0d1015; border-radius: 99px; }
.row-progress i { height: 100%; display: block; background: var(--accent); transition: width .2s; }
.file-actions { display: flex; gap: 5px; }
.file-actions button { width: 29px; height: 29px; display: grid; place-items: center; padding: 0; color: var(--muted); background: transparent; border: 1px solid var(--line); border-radius: 7px; cursor: pointer; }
.file-actions button:hover:not(:disabled) { color: var(--accent); border-color: var(--accent); }
.file-actions .download-one { color: var(--accent-dark); background: var(--accent); border-color: var(--accent); font-weight: 900; }

.setting-group { display: block; margin-bottom: 27px; }
.setting-head { display: flex; justify-content: space-between; gap: 18px; align-items: baseline; margin-bottom: 12px; }
.setting-head b { font-size: .88rem; }
.setting-head output { color: var(--accent); font: 800 .82rem/1 monospace; }
.mode-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mode-buttons button { min-height: 67px; padding: 12px; color: var(--muted); text-align: left; background: #15181e; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; transition: .18s ease; }
.mode-buttons button b, .mode-buttons button small { display: block; }
.mode-buttons button b { margin-bottom: 4px; color: var(--text); font-size: .78rem; }
.mode-buttons button small { font-size: .64rem; }
.mode-buttons button.active { color: rgba(9,37,29,.72); background: var(--accent); border-color: var(--accent); }
.mode-buttons button.active b { color: var(--accent-dark); }
.auto-note, .quality-note { display: flex; gap: 11px; align-items: flex-start; padding: 14px; margin-bottom: 24px; border-radius: 10px; }
.auto-note { background: rgba(102,217,184,.08); border: 1px solid rgba(102,217,184,.26); }
.auto-note > span { width: 8px; height: 8px; flex: none; margin-top: 5px; background: var(--accent); border-radius: 50%; box-shadow: 0 0 0 4px rgba(102,217,184,.1); }
.auto-note p, .quality-note p { margin: 0; color: var(--muted); font-size: .72rem; line-height: 1.5; }
.auto-note b, .quality-note b { color: var(--text); }
.quality-note { background: #15181e; border: 1px solid var(--line); }
.quality-note > span { width: 20px; height: 20px; flex: none; display: grid; place-items: center; color: var(--accent-dark); background: var(--accent); border-radius: 50%; font-family: Georgia, serif; font-weight: 800; }
input[type="range"] { width: 100%; height: 4px; appearance: none; background: linear-gradient(90deg, #65706d, var(--accent)); border-radius: 99px; cursor: pointer; }
input[type="range"]::-webkit-slider-thumb { width: 19px; height: 19px; appearance: none; background: var(--accent); border: 3px solid var(--panel-2); border-radius: 50%; box-shadow: 0 0 0 1px var(--accent); }
.range-labels { display: flex; justify-content: space-between; margin-top: 8px; color: #89919d; font: .58rem/1 monospace; letter-spacing: .05em; }
.primary-button, .download-all button { display: flex; justify-content: space-between; align-items: center; border: 0; border-radius: 11px; cursor: pointer; font-weight: 900; text-transform: uppercase; letter-spacing: .06em; }
.primary-button { width: 100%; min-height: 55px; padding: 0 18px; color: var(--accent-dark); background: var(--accent); }
.primary-button b { font-size: 1.25rem; }
.primary-button:hover:not(:disabled), .download-all button:hover:not(:disabled) { background: #7ee5c8; transform: translateY(-1px); }
button:disabled, input:disabled { cursor: not-allowed; opacity: .5; }

.result-panel { margin-top: 27px; overflow: hidden; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.status-line { min-height: 53px; display: flex; align-items: center; gap: 10px; padding: 0 20px; }
.status-line > span { width: 8px; height: 8px; flex: none; background: var(--accent); border-radius: 50%; }
.status-line > span.pulse { animation: pulse .9s infinite alternate; }
.status-line p { margin: 0; color: var(--muted); font: .7rem/1.4 monospace; }
@keyframes pulse { to { opacity: .25; transform: scale(.7); } }
.summary { display: grid; grid-template-columns: repeat(3,1fr) 1.45fr; border-top: 1px solid var(--line); }
.summary > div { padding: 21px; border-right: 1px solid var(--line); }
.summary > div:last-child { border: 0; }
.summary small { display: block; margin-bottom: 7px; color: var(--muted); font-size: .58rem; font-weight: 800; letter-spacing: .1em; }
.summary strong { font-size: 1.65rem; line-height: 1; }
.summary .accent strong { color: var(--accent); }
.summary .saving { display: flex; flex-direction: column; justify-content: center; }
.summary .saving strong { color: var(--accent); font: italic 1.3rem/1.1 Georgia, serif; }
.summary .saving small { margin: 6px 0 0; }
.download-all { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 17px 20px; border-top: 1px solid var(--line); }
.download-all p { margin: 0; color: var(--muted); font: .8rem/1.4 Georgia, serif; }
.download-all button { min-width: 220px; min-height: 43px; padding: 0 15px; color: var(--accent-dark); background: var(--accent); }

.trust-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; padding: 58px 0 70px; }
.trust-grid article { padding: 22px; background: rgba(23,26,33,.72); border: 1px solid var(--line); border-radius: 14px; }
.trust-grid b { color: var(--accent); }
.trust-grid p { margin: 7px 0 0; color: var(--muted); font-size: .88rem; }
.trust-grid a { color: var(--accent); }
footer { border-top: 1px solid var(--line); }
footer .wrap { min-height: 75px; display: flex; justify-content: space-between; align-items: center; gap: 20px; color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; }

@media (max-width: 840px) {
  .nav { align-items: flex-start; padding: 16px 0; flex-direction: column; }
  .nav-links { gap: 14px; }
  .hero { grid-template-columns: 1fr; padding-top: 58px; }
  .tool-grid { grid-template-columns: 1fr; }
  .settings-panel { border-top: 1px solid var(--line); border-left: 0; }
  .summary { grid-template-columns: repeat(3,1fr); }
  .summary .saving { grid-column: 1 / -1; border-top: 1px solid var(--line); }
  .trust-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .wrap { width: min(var(--max), calc(100% - 24px)); }
  .hero { padding: 42px 0 36px; }
  h1 { font-size: 3.3rem; }
  .tool-panel { padding: 22px; }
  .summary > div { padding: 15px 9px; }
  .summary strong { font-size: 1.2rem; }
  .download-all { align-items: stretch; flex-direction: column; }
  .download-all button { width: 100%; }
  footer .wrap { align-items: flex-start; justify-content: center; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}