/* ==========================================================================
   NZVPN Design System · tutorial.css
   教程页专属样式
   ========================================================================== */

/* ---------- Tutorial Head ---------- */
.tutorial-head {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
  padding-bottom: 20px;
}

.tutorial-head h1 {
  margin-top: 12px;
  font-size: clamp(36px, 4.5vw, 52px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.tutorial-head .lead {
  margin-top: 14px;
  font-size: 17px;
  color: var(--muted);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- TOC Tabs 微调 ---------- */
.toc-tabs {
  max-width: 860px;
  margin: 24px auto 0;
}

/* ---------- Tutorial Step ---------- */
.tutorial-step {
  max-width: 860px;
  margin: 0 auto;
  padding-top: 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.tutorial-step:last-child {
  border-bottom: 0;
}

.tutorial-step h2 {
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.tutorial-step h3 {
  font-size: 18px;
  font-weight: 700;
  margin-top: 20px;
  margin-bottom: 10px;
}

.tutorial-step p {
  font-size: 15.5px;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 14px;
}

.tutorial-step .step-cta {
  margin-top: 20px;
  margin-bottom: 8px;
}

/* ---------- Step Badge ---------- */
.step-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 10px;
}

.step-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- Step List ---------- */
.step-list {
  margin: 16px 0;
  padding-left: 0;
  counter-reset: step-counter;
  list-style: none;
}

.step-list li {
  position: relative;
  padding-left: 36px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.7;
  counter-increment: step-counter;
}

.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--tint2);
  border: 1px solid var(--tint);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- Plain List ---------- */
.plain-list {
  margin: 12px 0 16px;
  padding-left: 0;
  list-style: none;
}

.plain-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- Plan Mini ---------- */
.plan-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0;
}

.plan-mini {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  padding: 16px 20px;
}

.plan-mini-name {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.plan-mini ul {
  list-style: none;
}

.plan-mini li {
  padding: 4px 0;
  font-size: 14px;
  color: var(--text);
}

.plan-mini li strong {
  color: var(--accent-dark);
  font-weight: 700;
}

/* ---------- Tutorial Code ---------- */
.tutorial-code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 12px 16px;
  overflow-x: auto;
  white-space: nowrap;
  color: var(--text);
  margin: 12px 0;
}

/* ---------- Platform Tabs ---------- */
.platform-tabs {
  margin-top: 24px;
}

.platform-tabs .tablist {
  gap: 2px;
}

.platform-tabs .tabpanel {
  padding-top: 16px;
}

.platform-tabs .tabpanel h3 {
  font-size: 16px;
  margin-top: 0;
  margin-bottom: 12px;
}

.platform-tabs .tabpanel .step-list {
  margin-top: 8px;
}

/* ---------- Callout 内链接 ---------- */
.callout a {
  color: var(--accent-dark);
  font-weight: 600;
}

.callout a:hover {
  text-decoration: underline;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .tutorial-head {
    padding-bottom: 12px;
  }

  .tutorial-step {
    padding-top: 40px;
  }

  .plan-overview {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .tutorial-head h1 {
    font-size: clamp(30px, 7vw, 36px);
  }

  .tutorial-head .lead {
    font-size: 15px;
  }

  .tutorial-step {
    padding-top: 32px;
  }

  .tutorial-step h2 {
    font-size: 22px;
  }

  .tutorial-step p {
    font-size: 14.5px;
  }

  .step-list li {
    font-size: 14.5px;
    padding-left: 32px;
  }

  .step-list li::before {
    width: 22px;
    height: 22px;
    font-size: 11px;
  }

  .plain-list li {
    font-size: 14px;
  }

  .plan-mini {
    padding: 12px 14px;
  }

  .plan-mini li {
    font-size: 13.5px;
  }

  .tutorial-code {
    font-size: 12px;
  }
}