:root {
  --bg: #08111f;
  --card: #111d30;
  --card2: #15243a;
  --text: #eef6ff;
  --muted: #9fb0c7;
  --line: rgba(255,255,255,.1);
  --accent: #6ee7f9;
  --accent2: #8b5cf6;
  --ok: #34d399;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 15% 20%, rgba(110,231,249,.18), transparent 28%),
    radial-gradient(circle at 85% 10%, rgba(139,92,246,.18), transparent 30%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.header {
  max-width: 1160px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  gap: 12px;
  align-items: center;
  font-weight: 800;
  font-size: 20px;
}

.logo-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #07111f;
}

nav {
  display: flex;
  gap: 20px;
}

nav a {
  color: var(--muted);
  text-decoration: none;
}

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

main {
  max-width: 1160px;
  margin: 0 auto;
  padding: 20px 24px 60px;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 32px;
  align-items: center;
  padding: 50px 0;
}

.badge {
  display: inline-flex;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(255,255,255,.04);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: 12px;
}

h1 {
  margin: 18px 0;
  font-size: clamp(38px, 6vw, 68px);
  line-height: .98;
}

.hero p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.converter-card,
.status-card,
.section,
.hero-panel {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(17,29,48,.78);
  box-shadow: 0 24px 70px rgba(0,0,0,.28);
  backdrop-filter: blur(16px);
}

.converter-card {
  padding: 22px;
  margin-top: 26px;
}

.drop-zone {
  padding: 30px;
  border: 1px dashed rgba(255,255,255,.22);
  border-radius: 22px;
  text-align: center;
  background: rgba(255,255,255,.035);
  cursor: pointer;
  transition: .2s;
}

.drop-zone:hover,
.drop-zone.active {
  border-color: var(--accent);
  background: rgba(110,231,249,.08);
}

.upload-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.drop-zone h2 {
  margin: 0;
  font-size: 22px;
}

.drop-zone p {
  margin: 8px 0 0;
  font-size: 14px;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 18px 0;
}

label {
  color: var(--muted);
  font-size: 14px;
}

select {
  width: 100%;
  margin-top: 8px;
  padding: 13px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--card2);
  color: var(--text);
}

button {
  width: 100%;
  border: 0;
  border-radius: 16px;
  padding: 15px 18px;
  color: #06111f;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  font-weight: 800;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.08);
}

.progress-wrap {
  display: none;
  margin-top: 18px;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.progress {
  height: 10px;
  background: rgba(255,255,255,.08);
  border-radius: 999px;
  overflow: hidden;
}

#progressBar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--ok));
  border-radius: 999px;
}

.result {
  display: none;
  margin-top: 16px;
  padding: 16px;
  border: 1px solid rgba(52,211,153,.35);
  border-radius: 16px;
  background: rgba(52,211,153,.08);
}

.result p {
  margin: 6px 0 0;
  font-size: 14px;
}

.hero-panel {
  padding: 24px;
  min-height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
}

.status-card {
  display: flex;
  gap: 14px;
  align-items: center;
  padding: 18px;
}

.dot {
  width: 13px;
  height: 13px;
  border-radius: 999px;
  background: var(--ok);
  box-shadow: 0 0 0 8px rgba(52,211,153,.1);
}

.status-card p {
  margin: 5px 0 0;
  font-size: 14px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.stats div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255,255,255,.04);
}

.stats strong {
  display: block;
  font-size: 26px;
}

.stats span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 28px;
  margin-top: 24px;
}

.section h2 {
  margin-top: 0;
  font-size: 32px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
}

.grid div {
  padding: 18px;
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  text-align: center;
  font-weight: 700;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.features article {
  padding: 20px;
  border-radius: 20px;
  background: rgba(255,255,255,.05);
}

.features p,
.faq p {
  color: var(--muted);
  line-height: 1.6;
}

details {
  padding: 16px;
  border-top: 1px solid var(--line);
}

summary {
  cursor: pointer;
  font-weight: 700;
}

footer {
  max-width: 1160px;
  margin: 0 auto;
  padding: 28px 24px 50px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 850px) {
  .hero,
  .features {
    grid-template-columns: 1fr;
  }

  nav {
    display: none;
  }

  .controls,
  .grid,
  .stats {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
    gap: 12px;
  }
}