:root {
  --bg: #07111f;
  --text: #f5f7fb;
  --muted: #b8c0cf;
  --accent: #5eead4;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top, #12304d 0%, var(--bg) 50%, #02060d 100%);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 20px 0;
}

.brand {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.brand.small {
  font-size: 0.9rem;
  opacity: 0.8;
}

.top-links {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.top-links a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 600;
}

.page {
  max-width: 700px;
  margin: 0 auto;
  padding: 60px 20px;
  text-align: center;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

p {
  color: var(--muted);
  margin-bottom: 24px;
}

.upload-box {
  display: inline-block;
  padding: 18px 24px;
  border: 2px dashed var(--accent);
  border-radius: 16px;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.06);
}

.upload-box input {
  display: none;
}

.file-name {
  margin-top: 12px;
  color: var(--text);
  font-weight: 600;
}

.status {
  margin-top: 16px;
  min-height: 24px;
  color: var(--muted);
}

.status.error {
  color: #ff8a80;
}

.progress-wrap {
  width: 100%;
  max-width: 380px;
  margin: 20px auto 0;
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #60a5fa);
  border-radius: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #04111c;
  font-size: 0.7rem;
  font-weight: 700;
}

.convert-button,
.download-button {
  display: inline-block;
  margin-top: 18px;
  padding: 12px 18px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  color: #04111c;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.convert-button:hover:not(:disabled),
.download-button:hover {
  transform: translateY(-2px);
}

.convert-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.download-button {
  margin-left: 8px;
}

.back-link {
  display: inline-block;
  margin-top: 20px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}