body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  margin: 0;
  background: #f7f7f7;
  color: #111;
}

.container {
  max-width: 860px;
  margin: 32px auto;
  background: white;
  padding: 24px;
  border-radius: 14px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.08);
}

.container.wide { max-width: 1040px; }
.container.widest { max-width: 1280px; }

h1 { margin-top: 0; }

.instructions {
  background: #fff6d5;
  border: 1px solid #f2d17a;
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 16px;
}

.error {
  background: #ffe3e3;
  border: 1px solid #ffb5b5;
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 12px;
}

label { display: block; font-weight: 600; margin-top: 12px; }
input, select, textarea {
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #ddd;
  margin-top: 6px;
  box-sizing: border-box;
}

input[type="range"] {
  padding: 0;
  border: 0;
  border-radius: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.slider-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
}

.slider-q {
  padding: 8px;
  border: 1px solid #eee;
  border-radius: 10px;
  background: #fafafa;
}

.q .hint { font-size: 12px; color: #555; margin-top: 4px; }

.btn {
  margin-top: 18px;
  padding: 10px 14px;
  border: 0;
  border-radius: 12px;
  background: #111;
  color: white;
  font-weight: 700;
  cursor: pointer;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.task-layout {
  display: grid;
  grid-template-columns: 1fr 430px;
  gap: 20px;
  align-items: start;
}

.task-form-col {
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding-right: 4px;
}

.video-wrap {
  position: relative;
  width: 100%;
  margin: 12px 0 14px;
}

video {
  width: 100%;
  border-radius: 14px;
  border: 1px solid #ddd;
}

.highlight {
  position: absolute;
  top: 8px;
  bottom: 8px;
  width: calc(50% - 12px);
  border: 4px solid #ff2b2b;
  border-radius: 12px;
  pointer-events: none;
  box-shadow: 0 0 0 2px rgba(255,43,43,0.15);
}

.highlight.left { left: 8px; }
.highlight.right { right: 8px; }

.segment-status {
  font-size: 14px;
  color: #333;
  margin-bottom: 10px;
}

.code {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 14px;
  border-radius: 12px;
  background: #f0f0f0;
  display: inline-block;
}

@media (max-width: 1024px) {
  .task-layout {
    grid-template-columns: 1fr;
  }

  .task-form-col {
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 720px) {
  .slider-grid,
  .grid {
    grid-template-columns: 1fr;
  }
}