/* ============================================
   阿奇 AI 百业市场赋能课 · 深色科技风(原版风格)
   阿奇AI品牌色: 金#FFD700 / 青#00d4ff / 红#FF4444 / 绿#00ff88
   ============================================ */
:root{
  --bg:#0a0a0f;
  --bg-2:#12121a;
  --bg-3:#1a1a2e;
  --ink:#f0f0f5;
  --muted:#b0b0c0;
  --text-3:#606070;
  --line:rgba(255,255,255,.08);
  --glass:rgba(255,255,255,.04);
  --glass-border:rgba(255,255,255,.08);
  --glass-border-hover:rgba(255,215,0,.25);
  --accent:#FFD700;
  --accent-2:#00d4ff;
  --accent-3:#FF4444;
  --accent-green:#00ff88;
  --gold:#FFD700;
  --teal:#00d4ff;
  --shadow:0 18px 55px rgba(0,0,0,.5);
  --radius:18px;
  --radius-sm:12px;
  --font:'Noto Sans SC',sans-serif;
  --display:'Bebas Neue',sans-serif;
  --transition:all .3s cubic-bezier(.4,0,.2,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);overflow-x:hidden;line-height:1.65}
a{color:inherit;text-decoration:none}
button,select,input{font:inherit;color:inherit}
::selection{background:rgba(255,215,0,.3)}

/* 粒子背景 */
#particleCanvas{position:fixed;top:0;left:0;width:100%;height:100%;z-index:0;pointer-events:none;opacity:.6}

/* ===== 顶部导航 ===== */
.topbar{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:12px 28px;background:rgba(10,10,15,.82);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:19px;color:var(--ink)}
.brand-logo{height:38px;width:auto;filter:drop-shadow(0 0 6px rgba(255,215,0,.3))}
.brand span{background:linear-gradient(135deg,var(--accent),#FF8C00);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{padding:8px 14px;border-radius:10px;font-size:14px;color:var(--muted);transition:var(--transition);background:transparent}
.nav a:hover{color:var(--accent);background:var(--glass)}
.nav a::after{content:'';display:block;width:0;height:2px;background:var(--accent);transition:width .3s;margin-top:2px}
.nav a:hover::after{width:100%}

/* ===== Hero ===== */
.hero{position:relative;z-index:1;max-width:1180px;margin:0 auto;padding:70px 28px 50px;display:flex;gap:46px;align-items:center}
.hero-copy{flex:1.2}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--accent);font-size:14px;letter-spacing:2px;background:rgba(255,215,0,.1);border:1px solid rgba(255,215,0,.25);padding:6px 16px;border-radius:30px;margin-bottom:22px}
.hero h1{font-size:52px;line-height:1.12;font-weight:900;margin-bottom:22px;font-family:var(--display),var(--font);letter-spacing:1px}
.hero h1::after{content:'';display:block;width:84px;height:4px;background:linear-gradient(90deg,var(--accent),var(--accent-2));border-radius:2px;margin-top:18px}
.hero-text{color:var(--muted);font-size:17px;max-width:560px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.primary-action{background:linear-gradient(135deg,var(--accent),#FF8C00);color:#0a0a0f;padding:14px 28px;border-radius:40px;font-weight:800;font-size:15px;box-shadow:0 6px 24px rgba(255,215,0,.3);transition:var(--transition)}
.primary-action:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(255,215,0,.4)}
.secondary-action{background:rgba(255,255,255,.05);border:1px solid var(--glass-border);color:var(--ink);padding:13px 26px;border-radius:40px;font-weight:600;font-size:15px;transition:var(--transition)}
.secondary-action:hover{border-color:var(--accent);color:var(--accent)}

/* Hero 右侧展示板 */
.hero-board{flex:0 0 340px;background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius);padding:24px;backdrop-filter:blur(10px)}
.board-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;color:var(--muted);font-size:14px}
.board-top strong{color:var(--accent);font-family:var(--display);font-size:28px;font-weight:900}
.progress-track{height:8px;background:rgba(255,255,255,.08);border-radius:20px;overflow:hidden;margin-bottom:18px}
.progress-track span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .5s}
.artifact-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.artifact-list span{background:rgba(255,255,255,.05);border:1px solid var(--glass-border);color:var(--muted);padding:5px 12px;border-radius:8px;font-size:12px}
.artifact-list span:nth-child(3n){color:var(--accent-2);border-color:rgba(0,212,255,.3)}
.board-note{background:linear-gradient(135deg,rgba(255,215,0,.08),rgba(0,212,255,.05));border:1px solid rgba(255,215,0,.18);border-radius:12px;padding:14px 16px}
.board-note strong{color:var(--accent);font-size:14px;display:block;margin-bottom:6px}
.board-note p{color:var(--muted);font-size:13px}

/* ===== Section 通用 ===== */
.section{position:relative;z-index:1;max-width:1180px;margin:0 auto;padding:64px 28px}
.section-kicker{color:var(--accent-2);font-size:14px;letter-spacing:2px;margin-bottom:10px}
.section-heading{max-width:720px;margin-bottom:38px}
.section-heading h2{font-size:36px;font-weight:900;margin-bottom:14px;font-family:var(--display),var(--font)}
.section-heading p{color:var(--muted);font-size:15px}
.split-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;max-width:100%}
.intro{display:flex;gap:40px;align-items:center}
.intro h2{color:var(--accent)}
.intro>p{flex:1;color:var(--muted)}

/* ===== 五步法 ===== */
.method-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px}
.method-grid article,.workflow-grid article,.start-grid article,.steps article{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius);padding:24px;backdrop-filter:blur(8px);transition:var(--transition)}
.method-grid article:hover,.workflow-grid article:hover,.start-grid article:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.4)}
.step-number{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,rgba(255,215,0,.2),rgba(0,212,255,.15));color:var(--accent);font-weight:900;font-size:18px;margin-bottom:14px;font-family:var(--display)}
.method-grid h3,.workflow-grid h3,.start-grid h3,.steps h3{font-size:18px;margin-bottom:8px;color:var(--ink)}
.method-grid p,.workflow-grid p,.start-grid p,.steps p{color:var(--muted);font-size:13.5px}
.market-note{margin-top:28px;background:linear-gradient(135deg,rgba(0,212,255,.08),rgba(255,215,0,.05));border:1px solid rgba(0,212,255,.18);border-radius:var(--radius);padding:22px 26px}
.market-note h3{color:var(--accent-2);font-size:16px;margin-bottom:8px}
.market-note p{color:var(--muted);font-size:14px}

/* ===== 工作流 ===== */
.workflow-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.video-note{margin-top:28px;background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius);padding:20px 24px}
.video-note h3{color:var(--accent-green);font-size:15px;margin-bottom:8px}
.video-note p{color:var(--muted);font-size:14px}

/* ===== 新手入口 ===== */
.start-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.start-grid a{color:var(--accent-2);font-size:13px;display:inline-flex;align-items:center;gap:4px;margin-top:12px}
.start-grid a:hover{color:var(--accent)}

/* ===== 智能体区 ===== */
.prompt-wide,.prompt-box{background:#16161f;border:1px solid var(--glass-border);border-radius:var(--radius);overflow:hidden}
.prompt-top{display:flex;justify-content:space-between;align-items:center;padding:12px 18px;background:rgba(255,255,255,.03);border-bottom:1px solid var(--glass-border)}
.prompt-top h3{font-size:15px;color:var(--ink)}
.copy-btn{background:linear-gradient(135deg,var(--accent),#FF8C00);color:#0a0a0f;border:none;padding:7px 16px;border-radius:8px;font-weight:700;font-size:13px;cursor:pointer;transition:var(--transition)}
.copy-btn:hover{transform:translateY(-1px)}
.prompt-wide pre{margin:0;padding:18px 20px;color:var(--muted);font-size:13.5px;line-height:1.8;white-space:pre-wrap;font-family:var(--font)}
.utility-prompts{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:20px 0}
.prompt-box{padding:0}
.prompt-box h4{padding:12px 18px;font-size:14px;color:var(--accent-2)}
.prompt-box pre{margin:0;padding:0 18px 16px;color:var(--muted);font-size:13px;white-space:pre-wrap}
.copy-guide{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:28px 0}
.copy-guide div{background:var(--glass);border:1px solid var(--glass-border);border-radius:12px;padding:18px}
.copy-guide span{display:inline-block;background:rgba(0,212,255,.12);color:var(--accent-2);padding:3px 10px;border-radius:8px;font-size:11px;letter-spacing:1px;margin-bottom:8px}
.copy-guide strong{display:block;color:var(--ink);font-size:15px;margin-bottom:6px}
.copy-guide p{color:var(--muted);font-size:13px}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;margin-top:28px}

/* ===== 选行业 ===== */
.industry-picker{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius);padding:22px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:20px}
.industry-picker h3{color:var(--accent);font-size:17px;margin-bottom:6px}
.industry-picker p{color:var(--muted);font-size:13.5px}
.industry-picker select{background:var(--bg-3);border:1px solid var(--glass-border);color:var(--ink);border-radius:10px;padding:12px 40px 12px 14px;font-size:15px;cursor:pointer;appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--accent) 50%),linear-gradient(135deg,var(--accent) 50%,transparent 50%);background-position:calc(100%-22px) 50%,calc(100%-16px) 50%;background-size:6px 6px;background-repeat:no-repeat}
.industry-solution{background:linear-gradient(135deg,rgba(255,215,0,.06),rgba(0,212,255,.05));border:1px solid rgba(255,215,0,.16);border-radius:var(--radius);padding:24px}
.solution-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:16px}
.solution-item{background:var(--glass);border:1px solid var(--glass-border);border-radius:12px;padding:16px}
.solution-item h4{color:var(--accent-2);font-size:14px;margin-bottom:6px}
.solution-item p{color:var(--muted);font-size:13px}

/* ===== 7天课程 ===== */
.course-list{display:grid;gap:16px}
.day-card{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius);overflow:hidden;transition:var(--transition)}
.day-card:hover{border-color:var(--accent)}
.course-card-top{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;cursor:pointer}
.course-card-top h3,.course-card-top h4{font-size:17px;margin:0}
.course-card-top h4{color:var(--accent);font-family:var(--display);font-size:22px}
.day-content{padding:0 24px 22px;color:var(--muted);font-size:14px}
.case-strip{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.case-strip span{background:rgba(0,212,255,.1);color:var(--accent-2);border:1px solid rgba(0,212,255,.2);padding:4px 10px;border-radius:8px;font-size:12px}
.assignment{background:rgba(255,255,255,.04);border:1px dashed var(--glass-border-hover);border-radius:10px;padding:12px 14px;font-size:13px}
.instruction-box{background:rgba(0,255,136,.06);border:1px solid rgba(0,255,136,.2);border-radius:10px;padding:12px 14px;margin-top:10px;font-size:13px}
.instruction-box:before{content:'▶ ';color:var(--accent-green)}
.day-meta{display:flex;gap:10px;margin-top:10px;font-size:12px;color:var(--text-3)}
.done-btn{margin-top:12px;background:var(--glass);border:1px solid var(--glass-border);color:var(--muted);padding:8px 18px;border-radius:10px;cursor:pointer;font-size:13px}
.done-btn.completed{background:rgba(0,255,136,.12);color:var(--accent-green);border-color:rgba(0,255,136,.3)}

/* ===== 百业地图 ===== */
.industry-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.industry-group{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius);padding:20px}
.industry-group h3{color:var(--accent);font-size:16px;margin-bottom:12px}
.industry-list{display:flex;flex-wrap:wrap;gap:6px}
.industry-list span{color:var(--muted);font-size:12.5px}
.industry-list span::after{content:'·';margin-left:2px;color:var(--text-3)}
.industry-list span:last-child::after{content:''}

/* ===== 发布 ===== */
.publish-layout{display:grid;grid-template-columns:1fr 1.3fr;gap:26px;align-items:start}
.check-list{list-style:none;margin-top:16px}
.check-list li{position:relative;padding:8px 0 8px 30px;color:var(--muted);font-size:14.5px}
.check-list li::before{content:'✓';position:absolute;left:0;top:8px;color:var(--accent-green);font-weight:900}

/* ===== Footer ===== */
.footer{position:relative;z-index:1;background:var(--bg-2);border-top:1px solid var(--line);padding:36px 28px;text-align:center}
.footer p{color:var(--text-3);font-size:13px}

/* ===== Toast ===== */
.toast{position:fixed;bottom:30px;left:50%;transform:translate(-50%,80px);background:var(--accent);color:#0a0a0f;padding:12px 26px;border-radius:30px;font-weight:700;font-size:14px;opacity:0;transition:var(--transition);z-index:999}
.toast.show{transform:translate(-50%,0);opacity:1}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .hero{flex-direction:column;align-items:stretch;padding-top:40px}
  .hero h1{font-size:40px}
  .hero-board{flex:none}
  .nav{gap:2px}
  .nav a{padding:6px 10px;font-size:13px}
  .copy-guide{grid-template-columns:1fr}
  .publish-layout{grid-template-columns:1fr}
  .utility-prompts{grid-template-columns:1fr}
  .intro{flex-direction:column}
}
@media(max-width:600px){
  .topbar{flex-wrap:wrap;padding:10px 16px}
  .hero h1{font-size:32px}
  .section{padding:48px 16px}
  .brand-logo{height:32px}
}


/* ===== 语言切换 ===== */
.lang-switch{display:flex;gap:4px;padding:3px;border-radius:12px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12)}
.lang-switch button{border:none;background:transparent;cursor:pointer;font-size:13px;color:#9b9b9b;padding:6px 10px;border-radius:9px;transition:all .2s;font-weight:600;line-height:1}
.lang-switch button:hover{color:#FFD700}
.lang-switch button.active{color:#0a0a0f;background:#FFD700;box-shadow:0 2px 10px rgba(255,215,0,.35)}
@media(max-width:600px){
  .lang-switch{order:3;width:100%;justify-content:space-between}
  .lang-switch button{flex:1;font-size:12px;padding:7px 4px}
}