/* =================================================================
   Orange · 橙帮 Discuz! X5 风格 · 整站样式表
   移植自 step7-首页模板/preview/index.html · 适配橙帮品牌
   设计语言：暗色科技 + 紫青粉渐变 + 毛玻璃 + 滚动渐入
   ================================================================= */

/* ============ 基础重置 ============ */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--orange-bg,#07070f);
  color:var(--orange-text,#cbd5e1);
  line-height:1.6;overflow-x:hidden;
  min-height:100vh;
}

/* ============ 背景动画 ============ */
.o-bg-orbs{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.o-bg-orbs::before,.o-bg-orbs::after{
  content:'';position:absolute;border-radius:50%;filter:blur(80px);opacity:.4;
  animation:o-float 12s ease-in-out infinite;
}
.o-bg-orbs::before{
  width:600px;height:600px;background:radial-gradient(circle,#6366f1,transparent);
  top:-200px;left:-100px;
}
.o-bg-orbs::after{
  width:500px;height:500px;background:radial-gradient(circle,#06b6d4,transparent);
  bottom:-150px;right:-100px;animation-delay:-6s;
}
@keyframes o-float{50%{transform:translate(60px,40px) scale(1.1)}}

.o-grid-bg{
  position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.15;
  background-image:
    linear-gradient(var(--orange-grid-line,rgba(99,102,241,.3)) 1px,transparent 1px),
    linear-gradient(90deg,var(--orange-grid_line,rgba(99,102,241,.3)) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(ellipse at center,black 30%,transparent 80%);
}

/* ============ 通用 ============ */
.o-wrap{position:relative;z-index:1;max-width:1280px;margin:0 auto;padding:0 32px}
.o-sec{padding:100px 0;position:relative}

h1,h2,h3{font-weight:700;line-height:1.2;color:#fff}
.o-grad-text{
  background:var(--orange-grad-text,linear-gradient(135deg,#a78bfa 0%,#06b6d4 50%,#ec4899 100%));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}

/* ============ 顶部导航 ============ */
.o-nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:18px 0;backdrop-filter:blur(20px);
  background:rgba(7,7,15,.7);border-bottom:1px solid rgba(255,255,255,.06);
  transition:background .3s;
}
.o-nav.scrolled{background:rgba(7,7,15,.92)}
.o-nav .o-wrap{display:flex;justify-content:space-between;align-items:center}
.o-logo{font-size:20px;font-weight:800;display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none}
.o-logo-icon{
  width:36px;height:36px;border-radius:10px;
  background:linear-gradient(135deg,#6366f1,#06b6d4);
  display:grid;place-items:center;font-size:18px;color:#fff;
  box-shadow:0 0 30px rgba(99,102,241,.5);
}
.o-nav-links{display:flex;gap:32px;list-style:none}
.o-nav-links a{
  color:#94a3b8;text-decoration:none;font-size:14px;font-weight:500;
  transition:color .2s;
}
.o-nav-links a:hover{color:#fff}
.o-nav-cta{
  padding:8px 18px;border-radius:8px;font-size:14px;font-weight:600;
  background:linear-gradient(135deg,#6366f1,#06b6d4);color:#fff;border:none;cursor:pointer;
  transition:transform .2s,box-shadow .2s;text-decoration:none;
}
.o-nav-cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(99,102,241,.4)}

/* ============ Hero ============ */
.o-hero{padding:180px 0 80px;text-align:center;position:relative}
.o-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:100px;font-size:13px;font-weight:500;
  background:rgba(99,102,241,.15);border:1px solid rgba(99,102,241,.3);color:#a78bfa;
  margin-bottom:28px;
}
.o-badge .dot{width:6px;height:6px;border-radius:50%;background:#a78bfa;animation:o-pulse 2s infinite}
@keyframes o-pulse{50%{opacity:.4}}
.o-hero h1{
  font-size:clamp(40px,7vw,84px);letter-spacing:-.02em;margin-bottom:24px;
}
.o-hero h1 .line{display:block}
.o-sub{
  font-size:clamp(16px,2vw,20px);color:#94a3b8;max-width:680px;margin:0 auto 40px;
}
.o-cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.o-btn{
  padding:14px 28px;border-radius:12px;font-size:15px;font-weight:600;cursor:pointer;
  transition:all .25s;border:none;display:inline-flex;align-items:center;gap:8px;
  text-decoration:none;
}
.o-btn-primary{
  background:linear-gradient(135deg,#6366f1,#06b6d4);color:#fff;
  box-shadow:0 4px 20px rgba(99,102,241,.4);
}
.o-btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(99,102,241,.5);color:#fff}
.o-btn-ghost{
  background:rgba(255,255,255,.05);color:#fff;border:1px solid rgba(255,255,255,.15);
  backdrop-filter:blur(10px);
}
.o-btn-ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.3);color:#fff}

/* ============ Hero 装饰球 ============ */
.o-hero-visual{
  margin-top:80px;display:flex;justify-content:center;position:relative;height:280px;
}
.o-orb{
  width:240px;height:240px;border-radius:50%;position:relative;
  background:radial-gradient(circle at 30% 30%,#818cf8,#4338ca 50%,#1e1b4b);
  box-shadow:0 0 80px rgba(99,102,241,.5),inset 0 0 60px rgba(0,0,0,.5);
  animation:o-orb-float 6s ease-in-out infinite;
}
.o-orb::after{
  content:'';position:absolute;inset:-30px;border-radius:50%;
  border:2px dashed rgba(99,102,241,.3);animation:o-spin 20s linear infinite;
}
.o-orb-ring{
  position:absolute;width:340px;height:340px;border:1px solid rgba(6,182,212,.2);
  border-radius:50%;top:-50px;left:50%;transform:translateX(-50%);
  animation:o-spin 30s linear infinite reverse;
}
.o-orb-ring::before{
  content:'';position:absolute;width:12px;height:12px;border-radius:50%;
  background:#06b6d4;box-shadow:0 0 20px #06b6d4;top:-6px;left:50%;transform:translateX(-50%);
}
@keyframes o-orb-float{50%{transform:translateY(-20px)}}
@keyframes o-spin{to{transform:translateX(-50%) rotate(360deg)}}

/* ============ 数据条 ============ */
.o-stats{padding:60px 0;border-top:1px solid rgba(255,255,255,.06);border-bottom:1px solid rgba(255,255,255,.06)}
.o-stats-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center;
}
.o-stat-num{
  font-size:48px;font-weight:800;
  background:linear-gradient(135deg,#a78bfa,#06b6d4);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.o-stat-label{color:#94a3b8;font-size:14px;margin-top:8px}

/* ============ 区块标题通用 ============ */
.o-sec-head{text-align:center;margin-bottom:60px}
.o-sec-tag{
  display:inline-block;padding:4px 12px;border-radius:100px;font-size:12px;font-weight:600;
  background:rgba(99,102,241,.15);color:#a78bfa;letter-spacing:.1em;text-transform:uppercase;
  margin-bottom:16px;
}
.o-sec-title{font-size:clamp(32px,4vw,48px);margin-bottom:16px}
.o-sec-sub{color:#94a3b8;font-size:17px;max-width:600px;margin:0 auto}

/* ============ 模板卡片（6 卡） ============ */
.o-templates-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;
}
.o-tpl-card{
  padding:28px;border-radius:20px;
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);
  backdrop-filter:blur(20px);position:relative;overflow:hidden;
  transition:all .3s;cursor:pointer;
}
.o-tpl-card::before{
  content:'';position:absolute;inset:0;border-radius:20px;padding:1px;
  background:linear-gradient(135deg,transparent,rgba(99,102,241,.4),transparent);
  -webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;
  transition:opacity .3s;
}
.o-tpl-card:hover{transform:translateY(-6px);background:rgba(255,255,255,.05)}
.o-tpl-card:hover::before{opacity:1}
.o-tpl-head{display:flex;align-items:center;gap:16px;margin-bottom:16px}
.o-tpl-icon{
  width:56px;height:56px;border-radius:14px;display:grid;place-items:center;
  font-size:28px;flex-shrink:0;
}
.o-tpl-info h3{font-size:18px;margin-bottom:4px;color:#fff}
.o-tpl-tag{color:#94a3b8;font-size:13px}
.o-tpl-desc{color:#cbd5e1;font-size:14px;margin-bottom:16px;min-height:60px}
.o-tpl-meta{display:flex;flex-wrap:wrap;gap:6px}
.o-tag{
  padding:4px 10px;border-radius:6px;font-size:11px;font-weight:500;
  background:rgba(99,102,241,.12);color:#a78bfa;
}
.o-tag.cyan{background:rgba(6,182,212,.12);color:#67e8f9}
.o-tag.pink{background:rgba(236,72,153,.12);color:#f9a8d4}
.o-tag.green{background:rgba(34,197,94,.12);color:#86efac}
.o-tag.orange{background:rgba(245,158,11,.12);color:#fbbf24}

/* ============ 技能图谱 ============ */
.o-cloud{
  display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-bottom:48px;
}
.o-pill{
  padding:10px 20px;border-radius:100px;font-size:14px;font-weight:500;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);
  transition:all .2s;cursor:pointer;color:#cbd5e1;
}
.o-pill:hover{background:rgba(99,102,241,.15);border-color:#6366f1;color:#a78bfa}
.o-pill.lg{font-size:18px;padding:14px 28px;font-weight:600}
.o-pill.md{font-size:15px;padding:12px 22px}

.o-cats{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.o-cat{
  padding:24px;border-radius:16px;
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);
}
.o-cat h4{font-size:15px;margin-bottom:12px;color:#a78bfa}
.o-cat ul{list-style:none;color:#cbd5e1;font-size:14px}
.o-cat li{padding:6px 0;border-bottom:1px solid rgba(255,255,255,.04)}
.o-cat li:last-child{border-bottom:0}

/* ============ 教学路径 ============ */
.o-path{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;position:relative}
.o-step{
  padding:28px;border-radius:20px;position:relative;
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);
}
.o-step-num{
  width:40px;height:40px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(135deg,#6366f1,#06b6d4);font-weight:700;font-size:16px;
  margin-bottom:16px;color:#fff;
}
.o-step h3{font-size:18px;margin-bottom:8px;color:#fff}
.o-step-time{color:#94a3b8;font-size:12px;margin-bottom:12px}
.o-step-desc{color:#cbd5e1;font-size:14px}
.o-step-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}

/* ============ CTA ============ */
.o-cta-sec{
  text-align:center;padding:120px 0;position:relative;
}
.o-cta-box{
  padding:60px 40px;border-radius:32px;position:relative;overflow:hidden;
  background:linear-gradient(135deg,rgba(99,102,241,.15),rgba(6,182,212,.15));
  border:1px solid rgba(99,102,241,.3);
}
.o-cta-box h2{font-size:42px;margin-bottom:16px;color:#fff}
.o-cta-box p{color:#cbd5e1;font-size:18px;margin-bottom:32px;max-width:560px;margin-left:auto;margin-right:auto}

/* ============ Footer ============ */
.o-foot{padding:60px 0 30px;border-top:1px solid rgba(255,255,255,.06)}
.o-foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.o-foot h5{font-size:13px;color:#94a3b8;margin-bottom:16px;text-transform:uppercase;letter-spacing:.1em}
.o-foot ul{list-style:none}
.o-foot li{padding:5px 0;color:#cbd5e1;font-size:14px}
.o-foot li a{color:#cbd5e1;text-decoration:none;transition:color .2s}
.o-foot li a:hover{color:#a78bfa}
.o-foot-bottom{
  padding-top:24px;border-top:1px solid rgba(255,255,255,.06);
  display:flex;justify-content:space-between;color:#94a3b8;font-size:13px;
  flex-wrap:wrap;gap:12px;
}

/* ============ 响应式 ============ */
@media (max-width:768px){
  .o-nav-links{display:none}
  .o-stats-grid{grid-template-columns:repeat(2,1fr)}
  .o-foot-grid{grid-template-columns:1fr 1fr}
  .o-hero-visual{height:200px}
  .o-orb{width:160px;height:160px}
  .o-orb-ring{width:240px;height:240px}
  .o-cta-box h2{font-size:32px}
}

/* ============ 滚动渐入（JS 配合） ============ */
.o-fade-init{opacity:0;transform:translateY(30px);transition:opacity .6s ease-out, transform .6s ease-out}
.o-fade-in{opacity:1;transform:translateY(0)}