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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #f5f6f8;
  min-height: 100vh;
  color: #333;
  font-size: 15px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 24px 18px 36px;
}

/* ========== Header ========== */
.header {
  padding: 24px 0 28px;
}
.header .back {
  display: inline-block;
  color: #888;
  text-decoration: none;
  font-size: 15px;
  margin-bottom: 12px;
}
.header .back:hover { color: #555; }
.header h1 {
  font-size: 28px;
  font-weight: 700;
  color: #1a1a2e;
}
.header p {
  font-size: 15px;
  color: #888;
  margin-top: 4px;
}

/* ========== Timeline ========== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 36px;
}

.step {
  display: flex;
  gap: 12px;
}

.step-badge {
  flex-shrink: 0;
  width: 52px;
  height: 28px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  margin-top: 2px;
}
.step-badge.blue  { background: #2563eb; }
.step-badge.red   { background: #dc2626; }
.step-badge.orange { background: #ea580c; }

.step-card {
  flex: 1;
  background: #fff;
  border-radius: 10px;
  padding: 20px 22px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  display: flex;
  gap: 14px;
}

.step-num {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: #f5f6f8;
  color: #888;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content { flex: 1; min-width: 0; }
.step-content h2 {
  font-size: 17px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 6px;
}

.deadline {
  display: inline-block;
  padding: 4px 12px;
  background: #fef3c7;
  color: #92400e;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}
.deadline.urgent {
  background: #fee2e2;
  color: #dc2626;
}

.step-content ul {
  list-style: none;
  padding: 0;
}
.step-content li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 2;
  color: #555;
}
.step-content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #2563eb;
}

.warn {
  margin-top: 12px;
  padding: 10px 14px;
  background: #fff5f5;
  border-left: 3px solid #dc2626;
  font-size: 13px;
  color: #991b1b;
  border-radius: 0 4px 4px 0;
}

.tip {
  margin-top: 12px;
  padding: 10px 14px;
  background: #f8fafc;
  border-radius: 6px;
  font-size: 13px;
  color: #888;
}

/* ========== Footer ========== */
.footer {
  text-align: center;
  font-size: 13px;
  color: #bbb;
}
.footer a { color: #bbb; text-decoration: none; }
.footer a:hover { color: #888; }

/* ========== Mobile ========== */
@media (max-width: 640px) {
  .container { padding: 16px 14px 28px; }
  .header { padding: 16px 0 20px; }
  .header h1 { font-size: 24px; }
  .step { gap: 8px; }
  .step-badge { width: 46px; font-size: 11px; }
  .step-card { padding: 16px 16px; }
  .step-content h2 { font-size: 16px; }
  .step-content li { font-size: 14px; }
}