/* ==========================================================================
   VPNBL · ai.css
   AI 工具加速专题页(zh-CN/ai.html)专属样式
   仅本页使用;颜色/圆角/阴影/字体一律引用 base.css 的 :root 令牌。
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 页首
   -------------------------------------------------------------------------- */
.ai-hero{
  position:relative;
  overflow-x:clip;
  max-width:100%;
  background:linear-gradient(180deg,var(--bg-hero-top) 0%,var(--bg-hero-bottom) 100%);
  border-bottom:1px solid var(--border-soft);
}
.ai-hero__glow{
  position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(54% 62% at 50% 0%,var(--accent-halo),var(--accent-clear) 72%);
}
.ai-hero__grid{
  position:absolute;inset:0;pointer-events:none;opacity:.45;
  background-image:linear-gradient(var(--border-soft) 1px,transparent 1px),
                   linear-gradient(90deg,var(--border-soft) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:linear-gradient(180deg,var(--accent-halo),transparent 72%);
  mask-image:linear-gradient(180deg,var(--accent-halo),transparent 72%);
}
.ai-hero__inner{
  position:relative;z-index:2;
  max-width:960px;
  padding-block:56px 50px;
  text-align:center;
}
.ai-hero__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(30px,3.6vw,44px);
  line-height:1.16;
  letter-spacing:-.02em;
  color:var(--text);
  text-wrap:balance;
}
.ai-hero__lead{
  margin-top:14px;
  margin-inline:auto;
  max-width:780px;
  font-size:17px;
}
.ai-hero__cta{
  margin-top:24px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:12px;
}
.ai-hero__chips{
  margin-top:22px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:8px;
}

/* --------------------------------------------------------------------------
   2. 通用网格
   -------------------------------------------------------------------------- */
.ai-grid{display:grid;gap:18px}
.ai-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.ai-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.ai-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* --------------------------------------------------------------------------
   3. 判定逻辑小卡
   -------------------------------------------------------------------------- */
.ai-note-card{
  display:flex;flex-direction:column;gap:9px;
  padding:20px;
  border-radius:var(--r-card);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow-xs);
  min-width:0;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.ai-note-card:hover{transform:translateY(-3px);border-color:var(--accent-edge);box-shadow:var(--shadow-panel)}
.ai-note-card__ico{width:24px;height:24px;flex:none;color:var(--accent)}
.ai-note-card h3{font-size:16.5px}
.ai-note-card p{font-size:14.5px;line-height:1.72;color:var(--text-muted)}

/* --------------------------------------------------------------------------
   4. 工具卡
   -------------------------------------------------------------------------- */
.ai-tool{
  display:flex;flex-direction:column;gap:10px;
  padding:22px 20px;
  border-radius:var(--r-card);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow-xs);
  min-width:0;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.ai-tool:hover{transform:translateY(-3px);border-color:var(--accent-edge);box-shadow:var(--shadow-panel)}
.ai-tool__head{display:flex;align-items:center;gap:10px;min-width:0}
.ai-tool__mark{
  width:34px;height:34px;flex:none;
  display:grid;place-items:center;
  border-radius:10px;
  color:var(--accent);
  background:var(--accent-wash);
  border:1px solid var(--accent-edge);
}
.ai-tool__mark svg{width:18px;height:18px}
.ai-tool__name{font-size:16.5px;font-weight:800;letter-spacing:-.01em;min-width:0}
.ai-tool__meta{
  padding-bottom:10px;
  border-bottom:1px dashed var(--border);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--text-muted);
}
.ai-tool__list{display:grid;gap:8px}
.ai-tool__list li{
  display:flex;align-items:flex-start;gap:9px;
  font-size:14px;line-height:1.66;color:var(--text-muted);
}
.ai-tool__list li::before{
  content:"";width:5px;height:5px;border-radius:50%;flex:none;margin-top:8px;
  background:var(--accent);opacity:.5;
}

/* --------------------------------------------------------------------------
   5. 双栏面板(网页端 / API)
   -------------------------------------------------------------------------- */
.ai-split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.ai-panel{
  padding:24px 22px;
  border-radius:var(--r-card);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow-panel);
  min-width:0;
}
.ai-panel__tag{
  display:inline-flex;align-items:center;gap:7px;
  margin-bottom:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--accent);
}
.ai-panel__tag::before{
  content:"";width:6px;height:6px;border-radius:50%;flex:none;
  background:var(--accent);opacity:.55;
}
.ai-panel h3{margin-bottom:10px}
.ai-panel p{font-size:14.5px;line-height:1.72;color:var(--text-muted)}
.ai-panel p+p{margin-top:10px}

/* --------------------------------------------------------------------------
   6. 步骤列表(命令行 / 插件 / CI / 验证)
   -------------------------------------------------------------------------- */
.ai-steps{display:grid;gap:14px;counter-reset:ai-step}
.ai-steps li{
  position:relative;
  display:grid;gap:6px;
  padding:18px 20px 18px 62px;
  border-radius:var(--r-card);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow-xs);
  min-width:0;
}
.ai-steps li::before{
  counter-increment:ai-step;
  content:counter(ai-step,decimal-leading-zero);
  position:absolute;left:18px;top:18px;
  width:30px;height:30px;
  display:grid;place-items:center;
  border-radius:9px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  color:var(--accent);
  background:var(--accent-wash);
  border:1px solid var(--accent-edge);
}
.ai-steps h3{font-size:16px}
.ai-steps p{font-size:14.5px;line-height:1.72;color:var(--text-muted)}

/* --------------------------------------------------------------------------
   7. 失败现象与成因
   -------------------------------------------------------------------------- */
.ai-fail{display:grid;gap:12px}
.ai-fail__item{
  display:grid;grid-template-columns:minmax(0,270px) minmax(0,1fr);
  gap:6px 22px;
  padding:18px 20px;
  border-radius:var(--r-card);
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-left:3px solid var(--warn);
  box-shadow:var(--shadow-xs);
  min-width:0;
}
.ai-fail__sym{
  display:flex;align-items:center;gap:8px;
  font-size:14.5px;font-weight:800;color:var(--text);
  min-width:0;
}
.ai-fail__sym svg{width:16px;height:16px;flex:none;color:var(--warn)}
.ai-fail__body{font-size:14.5px;line-height:1.72;color:var(--text-muted);min-width:0}

/* --------------------------------------------------------------------------
   8. 要点列表 / 去向卡
   -------------------------------------------------------------------------- */
.ai-plain-list{display:grid;gap:10px;margin-top:14px}
.ai-plain-list li{
  display:flex;align-items:flex-start;gap:10px;
  font-size:15px;line-height:1.72;color:var(--text-muted);
}
.ai-plain-list li::before{
  content:"";width:6px;height:6px;border-radius:50%;flex:none;margin-top:9px;
  background:var(--accent);opacity:.5;
}
.ai-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:26px}
.ai-link-card{
  display:flex;flex-direction:column;gap:8px;
  padding:22px;
  border-radius:var(--r-card);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow-panel);
  min-width:0;
  transition:transform .2s ease,border-color .2s ease;
}
.ai-link-card:hover{transform:translateY(-3px);border-color:var(--accent-edge)}
.ai-link-card__title{font-size:16.5px;font-weight:800;letter-spacing:-.01em}
.ai-link-card__note{font-size:14px;line-height:1.68;color:var(--text-muted)}
.ai-link-card__go{
  margin-top:auto;padding-top:10px;
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:700;color:var(--accent);
}
.ai-link-card__go svg{width:14px;height:14px;flex:none}

/* --------------------------------------------------------------------------
   9. 响应式
   -------------------------------------------------------------------------- */
@media (max-width:1100px){
  .ai-grid--4,.ai-grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
  .ai-split{grid-template-columns:minmax(0,1fr)}
  .ai-fail__item{grid-template-columns:minmax(0,1fr)}
  .ai-links{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .ai-hero__inner{padding-block:34px 32px}
  .ai-hero__title{font-size:clamp(26px,7.8vw,34px)}
  .ai-hero__lead{font-size:16px}
  .ai-hero__cta{flex-direction:column;width:100%}
  .ai-grid--2,.ai-grid--3,.ai-grid--4{grid-template-columns:minmax(0,1fr)}
  .ai-steps li{padding:52px 16px 16px}
  .ai-steps li::before{left:16px;top:16px}
}
@media (prefers-reduced-motion:reduce){
  .ai-note-card:hover,.ai-tool:hover,.ai-link-card:hover{transform:none}
}