/* ===== 暗色主题（默认）===== */
:root {
  --primary: #6c63ff;
  --primary-dark: #5a52e0;
  --primary-light: #8b85ff;
  --secondary: #ff6584;
  --accent: #43e97b;
  --bg: #0d0d1a;
  --bg2: #13132b;
  --bg3: #1a1a35;
  --surface: #1e1e3a;
  --surface2: #252548;
  --border: rgba(108,99,255,0.2);
  --text: #f0f0ff;
  --text-muted: #9090bb;
  --text-dim: #606080;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(108,99,255,0.3);
  --transition: 0.25s cubic-bezier(.4,0,.2,1);
  --nav-bg: rgba(13,13,26,0.88);
}

/* ===== 亮色主题（跟随系统）===== */
@media (prefers-color-scheme: light) {
  :root {
    --primary: #5b52f0;
    --primary-dark: #4840d4;
    --primary-light: #7b76ff;
    --secondary: #e84a6a;
    --accent: #16b853;
    --bg: #f5f5fc;
    --bg2: #eeeef8;
    --bg3: #e6e6f4;
    --surface: #ffffff;
    --surface2: #f0f0fb;
    --border: rgba(108,99,255,0.15);
    --text: #1a1a2e;
    --text-muted: #5a5a7a;
    --text-dim: #9090aa;
    --shadow: 0 8px 32px rgba(0,0,0,0.1);
    --shadow-glow: 0 0 24px rgba(108,99,255,0.18);
    --nav-bg: rgba(245,245,252,0.92);
  }
}

/* ===== Reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{background:var(--bg);color:var(--text);font-family:'Inter',system-ui,-apple-system,sans-serif;line-height:1.6;min-height:100vh;overflow-x:hidden;transition:background var(--transition),color var(--transition)}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--primary-light)}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:none;font:inherit}
input,textarea,select{font:inherit}

/* ===== 滚动条 ===== */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:var(--bg2)}
::-webkit-scrollbar-thumb{background:var(--surface2);border-radius:99px}
::-webkit-scrollbar-thumb:hover{background:var(--primary)}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:var(--nav-bg);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border);height:64px;display:flex;align-items:center}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;width:100%;display:flex;align-items:center;justify-content:space-between;position:relative}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text);letter-spacing:-0.3px}
.nav-logo span{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-logo svg{width:28px;height:28px;flex-shrink:0}
.nav-links{display:flex;align-items:center;gap:8px}
.nav-links a{padding:7px 14px;border-radius:8px;color:var(--text-muted);font-size:14px;font-weight:500;transition:all var(--transition)}
.nav-links a:hover,.nav-links a.active{color:var(--text);background:var(--surface)}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-cta .btn-nav-login{padding:7px 18px;border-radius:8px;color:var(--text-muted);font-size:14px;font-weight:500;transition:all var(--transition)}
.nav-cta .btn-nav-login:hover{color:var(--text);background:var(--surface)}
.nav-cta .btn-nav-register{padding:7px 18px;border-radius:8px;background:var(--primary);color:#fff;font-size:14px;font-weight:600;transition:all var(--transition)}
.nav-cta .btn-nav-register:hover{background:var(--primary-dark);transform:translateY(-1px)}
.nav-hamburger{display:none;flex-direction:column;gap:5px;padding:6px;cursor:pointer;z-index:110}
.nav-hamburger span{width:22px;height:2px;background:var(--text-muted);border-radius:2px;transition:all var(--transition)}

/* ===== 移动端导航下拉 ===== */
.nav-mobile-menu{display:none;position:absolute;top:64px;left:0;right:0;background:var(--nav-bg);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:12px 16px;flex-direction:column;gap:4px;z-index:105}
.nav-mobile-menu.open{display:flex}
.nav-mobile-menu a{padding:10px 14px;border-radius:8px;color:var(--text-muted);font-size:14px;font-weight:500;transition:all var(--transition);display:block}
.nav-mobile-menu a:hover,.nav-mobile-menu a.active{color:var(--text);background:var(--surface)}
.nav-mobile-menu .divider{height:1px;background:var(--border);margin:6px 0}
.nav-mobile-menu .nav-cta-mobile{display:flex;gap:8px;padding:6px 0 4px}
.nav-mobile-menu .nav-cta-mobile .btn-nav-login{flex:1;text-align:center;padding:9px 14px;border-radius:8px;color:var(--text-muted);font-size:14px;font-weight:500;border:1px solid var(--border)}
.nav-mobile-menu .nav-cta-mobile .btn-nav-register{flex:1;text-align:center;padding:9px 14px;border-radius:8px;background:var(--primary);color:#fff;font-size:14px;font-weight:600}

/* ===== 汉堡动画 ===== */
.nav-hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-hamburger.open span:nth-child(2){opacity:0}
.nav-hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== 按钮系统 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 24px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;transition:all var(--transition);border:none;text-decoration:none;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 20px rgba(108,99,255,0.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(108,99,255,0.5);color:#fff}
.btn-secondary{background:var(--surface2);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--surface);border-color:var(--primary);color:var(--text);transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}
.btn-ghost:hover{color:var(--text);border-color:var(--text-muted)}
.btn-lg{padding:14px 32px;font-size:16px;border-radius:12px}
.btn-sm{padding:7px 16px;font-size:13px;border-radius:8px}
.btn-full{width:100%}
.btn:disabled{opacity:0.5;cursor:not-allowed;transform:none !important}

/* ===== 表单 ===== */
.form-group{margin-bottom:18px}
.form-group label{display:block;margin-bottom:6px;font-size:13px;font-weight:600;color:var(--text-muted);letter-spacing:0.3px}
.form-control{width:100%;padding:11px 14px;background:var(--surface);border:1.5px solid var(--border);border-radius:10px;color:var(--text);font-size:15px;transition:all var(--transition);outline:none}
.form-control:focus{border-color:var(--primary);background:rgba(108,99,255,0.05);box-shadow:0 0 0 3px rgba(108,99,255,0.15)}
.form-control::placeholder{color:var(--text-dim)}
.form-control.error{border-color:var(--secondary)}
.input-group{display:flex;gap:8px}
.input-group .form-control{flex:1}
.input-group .btn{flex-shrink:0;padding:11px 16px;font-size:13px}
.form-divider{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--text-dim);font-size:13px}
.form-divider::before,.form-divider::after{content:'';flex:1;height:1px;background:var(--border)}
.form-hint{font-size:12px;color:var(--text-dim);margin-top:4px}
.form-error{font-size:12px;color:var(--secondary);margin-top:4px}

/* ===== 卡片 ===== */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;transition:all var(--transition)}
.card:hover{border-color:rgba(108,99,255,0.4);transform:translateY(-3px);box-shadow:var(--shadow-glow)}
.card-sm{padding:20px;border-radius:var(--radius)}

/* ===== 标签/徽章 ===== */
.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600}
.badge-primary{background:rgba(108,99,255,0.2);color:var(--primary-light)}
.badge-success{background:rgba(67,233,123,0.2);color:#16b853}
.badge-warning{background:rgba(255,180,0,0.2);color:#ffb400}
.badge-error{background:rgba(255,101,132,0.15);color:var(--secondary)}
.badge-hot{background:linear-gradient(135deg,#ff6584,#ff4444);color:#fff}

/* ===== Toast通知 ===== */
#toast-container{position:fixed;top:80px;right:24px;z-index:9999;display:flex;flex-direction:column;gap:8px;pointer-events:none}
.toast{padding:12px 20px;border-radius:10px;font-size:14px;font-weight:500;display:flex;align-items:center;gap:8px;background:var(--surface2);border:1px solid var(--border);box-shadow:var(--shadow);pointer-events:auto;animation:toastIn .3s ease;min-width:200px;max-width:360px}
.toast.success{border-color:rgba(67,233,123,0.4);color:var(--accent)}
.toast.error{border-color:rgba(255,101,132,0.4);color:var(--secondary)}
.toast.info{border-color:rgba(108,99,255,0.4);color:var(--primary-light)}
@keyframes toastIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}

/* ===== 会员卡 ===== */
.plan-card{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius-lg);padding:32px 28px;transition:all var(--transition);position:relative;overflow:hidden;display:flex;flex-direction:column;gap:20px}
.plan-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--border)}
.plan-card.popular{border-color:var(--primary);background:rgba(108,99,255,0.05)}
.plan-card.popular::before{background:linear-gradient(90deg,var(--primary),var(--accent))}
.plan-card.lifetime{border-color:#d4a800;background:rgba(255,215,0,0.04)}
.plan-card.lifetime::before{background:linear-gradient(90deg,#ffd700,#ff9500)}
.plan-badge{position:absolute;top:16px;right:16px}
.plan-name{font-size:20px;font-weight:700;color:var(--text)}
.plan-price{display:flex;align-items:baseline;gap:4px}
.plan-price .amount{font-size:42px;font-weight:800;color:var(--text);letter-spacing:-1px}
.plan-price .unit{font-size:14px;color:var(--text-muted)}
.plan-price .period{font-size:14px;color:var(--text-muted)}
.plan-price-orig{font-size:13px;color:var(--text-dim);text-decoration:line-through;margin-top:-8px}
.plan-features{flex:1;display:flex;flex-direction:column;gap:10px}
.plan-features li{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-muted)}
.plan-features li .check{color:var(--accent);font-size:16px;flex-shrink:0}
.plan-features li .cross{color:var(--text-dim);font-size:16px;flex-shrink:0}

/* ===== 页脚 ===== */
.footer{background:var(--bg2);border-top:1px solid var(--border);padding:60px 24px 32px}
.footer-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px}
.footer-brand p{color:var(--text-muted);font-size:14px;line-height:1.8;margin-top:12px;max-width:260px}
.footer-col h4{font-size:14px;font-weight:700;color:var(--text);margin-bottom:16px;letter-spacing:0.3px;text-transform:uppercase}
.footer-col ul{display:flex;flex-direction:column;gap:10px}
.footer-col ul li a{font-size:14px;color:var(--text-muted);transition:color var(--transition)}
.footer-col ul li a:hover{color:var(--text)}
.footer-bottom{max-width:1200px;margin:40px auto 0;padding-top:24px;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:13px;color:var(--text-dim)}

/* ===== 通用布局 ===== */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:100px 24px}
.section-title{font-size:clamp(28px,4vw,42px);font-weight:800;letter-spacing:-0.5px;text-align:center;margin-bottom:16px}
.section-sub{font-size:17px;color:var(--text-muted);text-align:center;max-width:600px;margin:0 auto 60px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.flex-center{display:flex;align-items:center;justify-content:center}
.text-gradient{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.highlight{color:var(--primary)}

/* ===== 页面主体偏移 ===== */
.page-body{padding-top:64px}

/* ===== 模态框 ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.65);backdrop-filter:blur(8px);z-index:500;display:flex;align-items:center;justify-content:center;padding:24px;opacity:0;pointer-events:none;transition:opacity var(--transition)}
.modal-overlay.show{opacity:1;pointer-events:auto}
.modal{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:480px;padding:36px;position:relative;animation:modalIn .3s ease}
@keyframes modalIn{from{opacity:0;transform:scale(0.95) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}
.modal-close{position:absolute;top:16px;right:16px;width:32px;height:32px;border-radius:8px;background:var(--surface);color:var(--text-muted);display:flex;align-items:center;justify-content:center;font-size:18px;transition:all var(--transition);cursor:pointer;border:none}
.modal-close:hover{background:var(--surface2);color:var(--text)}
.modal h2{font-size:22px;font-weight:700;margin-bottom:6px;color:var(--text)}
.modal p.desc{font-size:14px;color:var(--text-muted);margin-bottom:24px}

/* ===== Tabs ===== */
.tabs{display:flex;background:var(--surface);border-radius:10px;padding:4px;gap:2px;margin-bottom:24px}
.tab-btn{flex:1;padding:9px 12px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text-muted);transition:all var(--transition);cursor:pointer;border:none;background:none;text-align:center}
.tab-btn.active{background:var(--primary);color:#fff;box-shadow:0 2px 8px rgba(108,99,255,0.4)}
.tab-panel{display:none}
.tab-panel.active{display:block}

/* ===== 社会化登录按钮 ===== */
.social-btns{display:flex;flex-direction:column;gap:10px;margin-top:4px}
.social-btn{display:flex;align-items:center;justify-content:center;gap:10px;padding:11px 20px;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition);border:1.5px solid var(--border);background:var(--surface);color:var(--text)}
.social-btn:hover{border-color:var(--primary);background:rgba(108,99,255,0.08);transform:translateY(-1px)}
.social-btn.wechat:hover{border-color:#07C160;background:rgba(7,193,96,0.08)}
.social-btn.qq:hover{border-color:#1e9ae0;background:rgba(30,154,224,0.08)}
.social-btn img,.social-btn svg{width:20px;height:20px}

/* ===== 手册页 ===== */
.docs-layout{display:grid;grid-template-columns:260px 1fr;min-height:calc(100vh - 64px);max-width:1200px;margin:0 auto;gap:0}
.docs-sidebar{position:sticky;top:64px;height:calc(100vh - 64px);overflow-y:auto;padding:28px 16px;border-right:1px solid var(--border)}
.docs-sidebar nav ul li a{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:8px;font-size:14px;color:var(--text-muted);transition:all var(--transition)}
.docs-sidebar nav ul li a:hover{color:var(--text);background:var(--surface)}
.docs-sidebar nav ul li a.active{color:var(--primary);background:rgba(108,99,255,0.1);font-weight:600}
.docs-sidebar .sidebar-group{margin-bottom:24px}
.docs-sidebar .sidebar-group-title{font-size:11px;font-weight:700;color:var(--text-dim);text-transform:uppercase;letter-spacing:0.8px;padding:0 12px;margin-bottom:6px}
.docs-content{padding:48px 60px;max-width:860px}
.docs-content h1{font-size:36px;font-weight:800;letter-spacing:-0.5px;margin-bottom:12px}
.docs-content h2{font-size:24px;font-weight:700;margin:48px 0 16px;padding-bottom:10px;border-bottom:1px solid var(--border)}
.docs-content h3{font-size:18px;font-weight:700;margin:28px 0 12px;color:var(--primary-light)}
.docs-content p{color:var(--text-muted);line-height:1.85;margin-bottom:16px;font-size:15px}
.docs-content ul,.docs-content ol{padding-left:20px;margin-bottom:16px;display:flex;flex-direction:column;gap:8px}
.docs-content ul li{list-style:disc;color:var(--text-muted);font-size:15px;line-height:1.7}
.docs-content ol li{list-style:decimal;color:var(--text-muted);font-size:15px;line-height:1.7}
.docs-content code{background:var(--surface2);padding:2px 7px;border-radius:5px;font-size:13px;font-family:'JetBrains Mono',monospace;color:var(--primary-light)}
.docs-content pre{background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:20px;overflow-x:auto;margin-bottom:20px}
.docs-content pre code{background:none;padding:0;font-size:14px}
.docs-content .callout{background:rgba(108,99,255,0.08);border-left:3px solid var(--primary);border-radius:0 10px 10px 0;padding:14px 18px;margin-bottom:20px;font-size:14px;color:var(--text-muted)}
.docs-content .callout.warning{background:rgba(255,180,0,0.08);border-color:#ffb400}
.docs-content .callout.success{background:rgba(67,233,123,0.08);border-color:var(--accent)}
.docs-step{display:flex;gap:16px;margin-bottom:20px;padding:16px;background:var(--surface);border-radius:10px;border:1px solid var(--border)}
.docs-step-num{width:32px;height:32px;border-radius:8px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;flex-shrink:0}
.docs-step-content h4{font-size:15px;font-weight:700;color:var(--text);margin-bottom:4px}
.docs-step-content p{font-size:14px;color:var(--text-muted);margin:0;line-height:1.6}

/* ===== 用户中心 ===== */
.dashboard-layout{display:grid;grid-template-columns:220px 1fr;min-height:calc(100vh - 64px);max-width:1200px;margin:0 auto}
.dash-sidebar{padding:24px 16px;border-right:1px solid var(--border)}
.dash-sidebar ul{display:flex;flex-direction:column;gap:4px}
.dash-sidebar ul li a{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:10px;font-size:14px;font-weight:500;color:var(--text-muted);transition:all var(--transition)}
.dash-sidebar ul li a:hover{background:var(--surface);color:var(--text)}
.dash-sidebar ul li a.active{background:rgba(108,99,255,0.12);color:var(--primary);font-weight:600}
.dash-sidebar ul li a .icon{font-size:18px;width:20px;text-align:center}
.dash-content{padding:40px 48px;min-height:calc(100vh - 64px)}
.dash-title{font-size:26px;font-weight:800;margin-bottom:4px}
.dash-subtitle{font-size:14px;color:var(--text-muted);margin-bottom:32px}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;gap:8px;transition:all var(--transition)}
.stat-card:hover{border-color:rgba(108,99,255,0.3);transform:translateY(-2px)}
.stat-card .stat-icon{font-size:28px}
.stat-card .stat-value{font-size:28px;font-weight:800;color:var(--text);letter-spacing:-0.5px}
.stat-card .stat-label{font-size:13px;color:var(--text-muted)}
.member-card-widget{background:linear-gradient(135deg,var(--primary),var(--primary-dark));border-radius:var(--radius-lg);padding:24px 28px;position:relative;overflow:hidden;color:#fff}
.member-card-widget::after{content:'';position:absolute;right:-20px;top:-20px;width:140px;height:140px;border-radius:50%;background:rgba(255,255,255,0.06)}

/* ===== 通用导航脚本支持 ===== */
[data-theme-toggle]{cursor:pointer}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .footer-inner{grid-template-columns:1fr 1fr}
  .docs-layout{grid-template-columns:220px 1fr}
  .docs-content{padding:36px 32px}
}
@media(max-width:768px){
  .nav-links{display:none}
  .nav-cta{display:none}
  .nav-hamburger{display:flex}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .docs-layout{grid-template-columns:1fr}
  .docs-sidebar{display:none}
  .docs-content{padding:24px 20px}
  .dashboard-layout{grid-template-columns:1fr}
  .dash-sidebar{display:none}
  .dash-content{padding:24px 20px}
  .section{padding:64px 20px}
  .plan-cards-grid{grid-template-columns:1fr !important}
  /* 导航 logo 文字 */
  .nav-logo span{font-size:16px}
  /* section 标题 */
  .section-title{font-size:clamp(22px,5vw,36px)}
  .section-sub{font-size:15px;margin-bottom:36px}
  /* 页脚 */
  .footer-bottom{flex-direction:column;text-align:center;gap:6px}
  /* 弹窗 */
  .modal{padding:28px 20px;margin:16px}
}
@media(max-width:480px){
  .btn-lg{padding:12px 24px;font-size:15px}
  .modal{padding:24px}
  /* 导航内边距 */
  .nav-inner{padding:0 16px}
  /* hero 区域 */
  .hero{padding:88px 16px 48px}
  .hero h1{font-size:clamp(28px,8vw,44px);letter-spacing:-0.5px}
  .hero-desc{font-size:15px}
  .hero-actions{gap:10px}
  .hero-actions .btn-lg{padding:12px 18px;font-size:14px;width:100%;justify-content:center}
  .hero-actions{flex-direction:column;align-items:center}
  .hero-stats{gap:24px}
  .hero-stat strong{font-size:22px}
  /* 功能卡片 */
  .features-grid{gap:14px}
  .feature-card{padding:20px}
  /* 通用 CTA 区域按钮 */
  .cta-actions{flex-direction:column;align-items:center;gap:10px}
  .cta-actions .btn-lg{width:100%;max-width:320px;justify-content:center}
  /* 容器 */
  .container{padding:0 16px}
  /* 定价卡片 */
  .plan-toggle{flex-direction:row;flex-wrap:wrap;justify-content:center}
  /* 页脚 */
  .footer-inner{gap:28px;padding:0 16px}
  .footer-col h4{margin-top:0}
}