:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #556070;
  --accent: #0f766e;
  --accent-2: #14b8a6;
  --border: #d9e1ec;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at 15% 10%, #d8f3ef 0%, transparent 35%), var(--bg);
  color: var(--text);
}

.app {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 14px;
}

.topbar h1 {
  margin: 0;
}

.topbar p {
  margin: 4px 0 0;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 6px 20px rgba(26, 34, 49, 0.07);
}

.file-label,
button,
#downloadLink {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 14px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

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

.file-label:hover,
button:hover,
#downloadLink:hover {
  background: var(--accent-2);
}

input[type="file"] {
  display: block;
  margin-top: 10px;
}

video {
  width: 100%;
  max-height: 340px;
  border-radius: 12px;
  background: #111;
}

.timeline {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.timeline label {
  font-size: 0.92rem;
  color: var(--muted);
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  align-items: center;
}

.tool-grid label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.tool-grid .check {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hint {
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 560px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}