:root {
  --color-primary: #1859ff;
  --color-primary-hover: #0d47d1;
  --color-bg: #ffffff;
  --color-bg-alt: #eeeeee;
  --color-text: #000000;
  --color-border: #d6d6d6;
  --color-accent: #1d98dc;
  --radius: 10px;
  --font-main: 'Arial', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 24px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header .logo { font-weight: 700; font-size: 20px; color: var(--color-primary); }

.hero {
  text-align: center;
  padding: 80px 20px;
  background: var(--color-bg-alt);
}

.hero h1 { font-size: 36px; margin-bottom: 16px; }
.hero p { font-size: 18px; color: #444; max-width: 640px; margin: 0 auto 40px; }

.track-grid {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 40px 20px 100px;
  flex-wrap: wrap;
}

.track-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  width: 320px;
  text-align: center;
  transition: transform .2s, box-shadow .2s;
  cursor: pointer;
}

.track-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(24,89,255,0.15);
  border-color: var(--color-primary);
}

.track-card .icon {
  width: 56px; height: 56px;
  margin: 0 auto 20px;
  background: var(--color-primary);
  border-radius: 50%;
}

.track-card h3 { font-size: 20px; margin-bottom: 12px; }
.track-card p { font-size: 14px; color: #555; margin-bottom: 24px; }

.btn-primary {
  display: inline-block;
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: 6px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background .2s;
}

.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:disabled { background: #aab8d6; cursor: not-allowed; }

.timer {
  position: fixed;
  top: 20px;
  right: 40px;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 18px;
}

.task-box {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--color-bg-alt);
  margin: 20px 0;
  position: relative;
  font-family: monospace;
  white-space: pre-wrap;
}

.copy-btn {
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 13px;
}

.info-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 32px;
}

.info-box ol { margin: 12px 0 0 20px; }

.question-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  background: var(--color-bg);
}

.question-card h4 { margin-bottom: 16px; }

.option-row {
  display: block;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  margin-bottom: 8px;
  cursor: pointer;
}

.option-row:hover { border-color: var(--color-primary); }
.option-row input { margin-right: 10px; }

input[type=text] {
  width: 100%;
  padding: 10px;
  margin: 8px 0 20px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 14px;
}

footer {
  background: var(--color-text);
  color: #fff;
  text-align: center;
  padding: 24px;
  font-size: 13px;
}

.container { max-width: 800px; margin: 60px auto; padding: 0 20px; }