/* ============================================================
   VPNLS · ai.css
   AI 工具专题页专属样式:页首、工具卡、清单、图例。
   只新增本页类名,不覆盖 base.css / components.css。
   ============================================================ */

.ai-hero {
  position: relative;
  max-width: 100%;
  overflow-x: clip;
  padding-top: 40px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--border);
  background-image:
    radial-gradient(ellipse at 12% 0%, var(--hero-glow) 0%, transparent 58%),
    linear-gradient(180deg, var(--bg-panel) 0%, var(--bg) 100%);
}

.ai-hero-copy {
  max-width: 860px;
}

.ai-hero h1 {
  margin: 14px 0 0;
}

.ai-hero-lede {
  margin: 14px 0 0;
  max-width: 66ch;
  color: var(--text-muted);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.7;
}

.ai-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.ai-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 12.5px;
}

.ai-trust span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.ai-trust span::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--amber);
}

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

.tool-grid > * {
  min-width: 0;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tool-card h3 {
  font-size: 17px;
}

.tool-card p {
  color: var(--text-muted);
  font-size: 13.5px;
  line-height: 1.75;
}

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: auto;
}

.ai-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ai-list li {
  position: relative;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.75;
}

.ai-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.ai-list strong {
  color: var(--text);
}

.panel .ai-list {
  margin-top: 12px;
}

.ai-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 14px;
}

.ai-legend > span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 12.5px;
  line-height: 1.5;
}

.ai-block {
  margin-top: 18px;
}

.ai-note {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
}

.ai-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.ai-link:hover {
  color: var(--accent-dark);
}

@media (max-width: 860px) {
  .tool-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .ai-hero {
    padding-top: 28px;
    padding-bottom: 24px;
  }

  .ai-hero-cta .btn {
    flex: 1 1 150px;
  }

  .ai-trust {
    gap: 6px 14px;
    font-size: 12px;
  }

  .ai-legend {
    gap: 8px 14px;
  }
}