/* Header */
.header{position:fixed;top:0;left:0;right:0;z-index:100;padding:0 40px;height:64px;display:flex;align-items:center;gap:32px;transition:background .3s,box-shadow .3s,padding .3s}
.header.scrolled{background:rgba(255,255,255,.95);backdrop-filter:blur(10px);box-shadow:0 1px 0 var(--border);padding:0 20px}
.header.scrolled .logo-text{color:var(--t1)}
.header.scrolled .header-search-btn{color:var(--t3)}
.header.scrolled .header-search-btn:hover{color:var(--t1);background:var(--bg3)}
.header.scrolled .cta-btn{background:var(--bg3);color:var(--t1);border-color:var(--border)}
.header.scrolled .cta-btn:hover{background:var(--amber-500);color:#fff;border-color:var(--amber-500)}
.header.scrolled .menu-btn{color:var(--t2)}
.header.scrolled .logo{margin-left:0}
.header .cta-btn{padding:7px 18px;background:rgba(255,255,255,.12);color:rgba(255,255,255,.9);border:1px solid rgba(255,255,255,.2);border-radius:20px;font-size:13px;font-weight:500;cursor:pointer;transition:all .25s;flex-shrink:0;display:flex;align-items:center;gap:6px;backdrop-filter:blur(6px)}
.header .cta-btn:hover{background:rgba(255,255,255,.22);border-color:rgba(255,255,255,.4);color:#fff}
.header-search-btn{margin-left:auto;background:none;border:none;color:rgba(255,255,255,.7);cursor:pointer;padding:6px;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:color .2s,background .2s}
.header-search-btn:hover{color:#fff;background:rgba(255,255,255,.1)}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;margin-left:40px;cursor:pointer}
.logo-icon{width:44px;height:44px}
.logo-icon img{width:100%;height:100%;object-fit:contain;border-radius:6px}
.logo-text{font-size:18px;font-weight:700;color:var(--white);letter-spacing:1px}

/* Page Layout — body flex so footer always at bottom */
body{display:flex;flex-direction:column;min-height:100vh}
.hero{flex-shrink:0}
.main{display:flex;flex-wrap:wrap;flex:1 0 auto}

/* Sidebar */
.sidebar{width:300px;flex-shrink:0;background:var(--bg2);border-right:1px solid var(--border);height:calc(100vh - 64px);position:sticky;top:64px;overflow-y:auto;padding:16px 0;scrollbar-width:thin;scrollbar-color:var(--border2) transparent}
.sb-section{margin-bottom:2px}
.sb-L1{margin:1px 8px;overflow:visible}
.sb-L1-header{display:flex;align-items:center;gap:10px;padding:10px 12px;cursor:pointer;transition:.2s;border-radius:8px;font-weight:600;font-size:14px;color:var(--t1)}
.sb-L1-header:hover{background:var(--bg3)}
.sb-icon{width:20px;height:20px;flex-shrink:0;display:flex;align-items:center;justify-content:center}
.sb-icon svg{width:20px;height:20px}
.sb-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sb-arrow{margin-left:auto;flex-shrink:0;width:18px;height:18px;display:flex;align-items:center;justify-content:center;color:var(--t3);transition:transform .25s ease}
.sb-arrow svg{width:16px;height:16px}
.sb-L1-header.open .sb-arrow{transform:rotate(90deg)}
.sb-L1-body{display:none;padding:2px 0 2px 24px}
.sb-L1-body.open{display:block}
.sb-L2{margin:1px 0}
.sb-L2-header{display:flex;align-items:center;gap:6px;padding:7px 12px 7px 20px;cursor:pointer;border-radius:6px;font-size:13px;color:var(--t2);transition:.2s}
.sb-L2-header:hover{background:var(--bg3);color:var(--t1)}
.sb-L2-header .sb-arrow svg{width:14px;height:14px}
.sb-L2-header .sb-arrow{width:16px;height:16px}
.sb-L2-header.open .sb-arrow{transform:rotate(90deg)}
.sb-L2-body{display:none;padding:2px 0 2px 20px}
.sb-L2-body.open{display:block}
.sb-L3{padding:6px 10px;border-radius:6px;font-size:12.5px;color:var(--t3);cursor:pointer;transition:.2s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sb-L3:hover{color:var(--t1);background:var(--bg)}
.sb-L3.active{color:#fff;background:#1b3a4b}
.sb-L3 .count{font-size:11px;background:var(--bg3);color:var(--t3);padding:1px 6px;border-radius:10px;margin-left:auto;float:right}
.sidebar-count-hint{font-size:11px;color:var(--t3);font-weight:400;flex-shrink:0}

/* Content */
.content{flex:1;padding:28px 48px 60px;min-width:0;min-height:calc(100vh - 64px)}
.page-wrap.fade-in{animation:pageWrapIn .4s ease both}
@keyframes pageWrapIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.content-header{margin-bottom:28px}
.breadcrumb{font-size:13px;color:var(--t3);margin-bottom:8px}
.breadcrumb span{color:var(--t2)}
.breadcrumb .sep{margin:0 6px;opacity:.4}
.content-title{margin-bottom:6px}
.content-desc{font-size:15px;color:var(--t3)}

/* L1 Section Header */
.section-block{margin-bottom:40px}
.L1-header{display:flex;align-items:center;gap:14px;padding:20px 24px;background:linear-gradient(135deg,var(--red-bg),transparent);border:1px solid var(--red-border);border-radius:var(--radius2);margin-bottom:20px}
.L1-header .badge{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;color:#fff;flex-shrink:0}
.L1-header h2{font-size:22px;font-weight:700;color:#1b3a4b}
.L1-header p{font-size:14px;color:var(--t3);margin-top:2px}

/* L2 Group */
.L2-group{margin-bottom:24px}
.L2-header{display:flex;align-items:center;gap:10px;padding:14px 18px;background:var(--orange-bg);border:1px solid var(--orange-border);border-radius:var(--radius);margin-bottom:14px;cursor:pointer}
.L2-header .icon{color:var(--orange);font-size:15px}
.L2-header h3{font-size:16px;font-weight:600;color:var(--t1);flex:1}
.L2-header .arrow{color:var(--t3);font-size:11px;transition:transform .3s}
.L2-header.open .arrow{transform:rotate(180deg)}

/* L3 Detail Layout */
.detail-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px;margin-top:24px;position:relative}
.detail-layout .detail-pain{border-radius:16px 50% 50% 16px;padding-right:100px}
.detail-layout .detail-sol{border-radius:50% 16px 16px 50%;padding-left:100px}
.detail-pain{background:var(--card);border:1px solid var(--border);border-radius:var(--radius2);padding:32px;box-shadow:var(--shadow-sm)}
.detail-pain .pain-label{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--red);padding:4px 14px;border-radius:20px;background:var(--red-bg);border:1px solid var(--red-border);margin-bottom:20px;text-transform:uppercase;letter-spacing:.5px}
.detail-pain h3{font-size:20px;font-weight:700;color:#1b3a4b;margin-bottom:16px;line-height:1.5}
.detail-pain p{font-size:15px;color:var(--t2);line-height:1.9;margin-bottom:20px}
.detail-pain .pain-points{list-style:none}
.detail-pain .pain-points li{font-size:14px;color:var(--t2);padding:10px 0 10px 24px;position:relative;line-height:1.7;border-bottom:1px solid var(--bg3)}
.detail-pain .pain-points li:last-child{border-bottom:none}
.detail-pain .pain-points li::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:8px;height:8px;border-radius:50%;background:var(--red);opacity:.6}
.detail-sol{overflow:visible}
.detail-sol .sol-label{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--green);padding:4px 14px;border-radius:20px;background:var(--green-bg);border:1px solid rgba(45,143,94,.25);margin-bottom:20px;letter-spacing:.5px;float:right}
.detail-sol h3{font-size:20px;font-weight:700;color:#1b3a4b;margin-bottom:16px;line-height:1.5;text-align:right}
.detail-layout.has-img .detail-center-img .sol-img{display:inline-block;width:320px;aspect-ratio:16/10;border-radius:var(--radius);overflow:hidden;background:var(--bg3);border:1px solid var(--border);box-shadow:var(--shadow-lg);cursor:pointer;transition:.2s}
.detail-layout.has-img .detail-center-img:hover .sol-img{box-shadow:0 8px 30px rgba(15,31,43,.2);transform:scale(1.03);border-color:var(--amber-500)}
.detail-center-img .sol-img img{width:100%;height:100%;object-fit:cover}
.detail-center-img .sol-img .img-hint{position:absolute;bottom:0;left:0;right:0;background:rgba(15,31,43,.75);color:#fff;font-size:11px;text-align:center;padding:4px 0;backdrop-filter:blur(4px);letter-spacing:.3px}
.detail-layout.has-img .detail-center-img{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:2;text-align:center;opacity:.25;transition:.3s}
.detail-layout.has-img .detail-center-img:hover{opacity:1}
.detail-sol .sol-list{list-style:none}
.detail-sol .sol-list li{font-size:14px;color:var(--t2);padding:10px 24px 10px 0;position:relative;line-height:1.7;border-bottom:1px solid var(--bg3);text-align:right}
.detail-sol .sol-list li:last-child{border-bottom:none}
.detail-sol .sol-list li::before{content:"";position:absolute;right:0;top:50%;transform:translateY(-50%);width:8px;height:8px;border-radius:2px;background:var(--green)}
.detail-effect{display:flex;align-items:center;gap:10px;margin-top:20px;padding:12px 16px;background:var(--blue-bg);border:1px solid var(--border);border-radius:var(--radius);font-size:14px;color:var(--blue)}
.detail-effect b{margin-left:auto;font-weight:700;color:var(--green)}

/* Solution Cards */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(380px,1fr));gap:16px}
.card{animation:fadeUp .4s ease both}
.card:nth-child(2){animation-delay:.05s}
.card:nth-child(3){animation-delay:.1s}
.card:nth-child(4){animation-delay:.15s}
.card-tag{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:600;padding:3px 10px;border-radius:20px;margin-bottom:12px;text-transform:uppercase;letter-spacing:.5px}
.card-tag.pain{background:var(--red-bg);color:var(--red);border:1px solid var(--red-border)}
.card-tag.sol{background:var(--green-bg);color:var(--green);border:1px solid rgba(63,185,80,.25)}
.card h4{font-size:15px;font-weight:600;color:#1b3a4b;margin-bottom:10px;line-height:1.5}
.card .divider{height:1px;background:var(--border);margin:14px 0}
.card .ai-label{font-size:12px;font-weight:600;color:var(--accent);margin-bottom:8px;display:flex;align-items:center;gap:6px}
.card .ai-label svg{width:14px;height:14px}
.card .solution-list{list-style:none}
.card .solution-list li{font-size:13px;color:var(--t2);padding:4px 0;padding-left:18px;position:relative;line-height:1.7}
.card .solution-list li::before{content:"→";position:absolute;left:0;color:var(--green);font-weight:700}
.card .effect{display:flex;align-items:center;gap:8px;margin-top:12px;padding:8px 12px;background:var(--blue-bg);border-radius:6px;font-size:12.5px;color:var(--blue);border:1px solid var(--border)}
.card .effect b{margin-left:auto;font-weight:600}

/* Search Results */
.search-info{padding:12px 0;margin-bottom:20px;font-size:14px;color:var(--t3);border-bottom:1px solid var(--border)}
.search-info b{color:var(--accent)}
.highlight{background:var(--accent-bg);color:var(--accent);padding:0 2px;border-radius:2px}
.card.search-hidden{display:none}

/* Welcome */
.welcome{text-align:center;padding:48px 20px 56px}
.welcome h1{font-size:28px;font-weight:700;color:var(--steel-800);margin-bottom:10px;letter-spacing:.5px;position:relative;display:inline-block}
.welcome h1::after{content:"";display:block;width:40px;height:3px;background:linear-gradient(90deg,var(--amber-500),var(--amber-400));border-radius:2px;margin:12px auto 0}
.welcome p{font-size:15px;color:var(--t3);max-width:640px;margin:0 auto 36px;line-height:1.8}
.quick-tags{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.quick-tag{padding:5px 14px;background:transparent;border:1px solid var(--border);border-radius:14px;font-size:12.5px;color:var(--t2);cursor:pointer;transition:all .2s}
.quick-tag:hover{background:var(--steel-800);color:#fff;border-color:var(--steel-800)}

/* Stats Bar */
.stats-bar{display:flex;gap:0;padding:0;margin-bottom:36px;background:var(--card);border-radius:var(--radius2);border:1px solid var(--border);overflow:hidden;box-shadow:var(--shadow-sm)}
.stat-item{flex:1;text-align:center;padding:22px 12px;position:relative;transition:.2s}
.stat-item:not(:last-child)::after{content:"";position:absolute;right:0;top:20%;height:60%;width:1px;background:var(--border)}
.stat-item:hover{background:var(--steel-50)}
.stat-item .num{font-size:28px;font-weight:800;color:var(--steel-700);line-height:1.2;letter-spacing:-.5px}
.stat-item .num .ai-badge{display:inline-block;background:linear-gradient(135deg,var(--amber-500),var(--amber-400));color:#fff;font-size:13px;font-weight:700;padding:2px 8px;border-radius:4px;letter-spacing:.5px;vertical-align:middle}
.stat-item .label{font-size:12px;color:var(--t3);margin-top:6px;font-weight:500;letter-spacing:.5px;text-transform:uppercase}

/* Mobile base rules */
.menu-btn{display:none;background:none;border:none;color:var(--white);font-size:22px;cursor:pointer;padding:4px}
.overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:150}

/* Hero */
.hero{background:var(--steel-900);padding:calc(64px + 40px) 40px 100px;text-align:center;position:relative;overflow:hidden;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 80% 50% at 50% 0%,rgba(58,124,165,.18) 0%,transparent 60%),radial-gradient(ellipse 60% 40% at 20% 80%,rgba(232,148,74,.08) 0%,transparent 50%),radial-gradient(ellipse 50% 50% at 85% 60%,rgba(45,143,94,.06) 0%,transparent 50%),linear-gradient(180deg,var(--steel-900) 0%,var(--steel-800) 100%);pointer-events:none;z-index:0}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:80px 80px;pointer-events:none;z-index:0}
.hero .hero-flow-bg{position:absolute !important;top:0;left:0;width:100%;height:100%;z-index:0;opacity:.22;pointer-events:none;display:flex !important;align-items:center;justify-content:center;overflow:hidden}
.hero .hero-flow-bg svg{width:100%;height:100%;max-width:none;max-height:none;object-fit:contain}
.hero>*:not(.hero-grid):not(.scroll-hint){position:relative;z-index:1}
.hero .hero-deco-line{width:48px;height:2px;background:linear-gradient(90deg,transparent,rgba(232,148,74,.6),transparent);margin-bottom:28px;border-radius:1px}
.hero .hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(74,222,128,.08);border:1px solid rgba(74,222,128,.2);border-radius:24px;padding:7px 20px;font-size:13px;color:rgba(255,255,255,.75);margin-bottom:32px;backdrop-filter:blur(4px);letter-spacing:.3px}
.hero .hero-badge b{color:#4ADE80;font-weight:700}
.hero h1{font-size:46px;font-weight:800;color:#fff;line-height:1.35;margin-bottom:20px;letter-spacing:1.5px}
.hero h1 span{background:linear-gradient(135deg,#E8944A 0%,#F0A85E 50%,#F5C06E 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:17px;color:rgba(255,255,255,.85);max-width:620px;margin:0 auto 40px;line-height:1.9;letter-spacing:.2px}
.content-search{max-width:560px;margin:0 auto 16px;position:relative;display:flex;align-items:center;background:#fff;border:1.5px solid var(--border);border-radius:40px;box-shadow:0 1px 4px rgba(15,31,43,.06),0 4px 16px rgba(15,31,43,.04);transition:border-color .25s,box-shadow .25s}
.content-search:focus-within{border-color:var(--steel-500);box-shadow:0 1px 4px rgba(15,31,43,.06),0 4px 16px rgba(15,31,43,.04),0 0 0 3px rgba(58,124,165,.12)}
.content-search input{flex:1;background:transparent;border:none;padding:14px 16px 14px 16px;font-size:14.5px;color:var(--t1);outline:none;min-width:0}
.content-search input::placeholder{color:var(--gray-400)}
.content-search .cs-icon{display:flex;align-items:center;justify-content:center;width:44px;height:44px;flex-shrink:0;color:var(--steel-500);pointer-events:none}
.content-search .cs-btn{padding:8px 22px;background:var(--steel-800);color:#fff;border:none;border-radius:24px;margin:4px 5px 4px 0;font-size:13px;font-weight:600;cursor:pointer;transition:background .2s;letter-spacing:.5px;white-space:nowrap;flex-shrink:0}
.content-search .cs-btn:hover{background:var(--amber-500)}
.content-quick-tags{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:28px;margin-bottom:20px}
.content-quick-tags span{font-size:12.5px;color:var(--t2);background:transparent;border:1px solid var(--border);padding:5px 14px;border-radius:14px;cursor:pointer;transition:all .2s}
.content-quick-tags span:hover{background:var(--steel-800);color:#fff;border-color:var(--steel-800)}
/* Hero内的quick-tags用深色背景样式 */
.hero .content-quick-tags span{color:rgba(255,255,255,.6);background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.12);backdrop-filter:blur(4px)}
.hero .content-quick-tags span:hover{background:rgba(255,255,255,.18);color:#fff;border-color:rgba(255,255,255,.25)}
.hero .hero-stats{display:flex;gap:0;justify-content:center;margin-top:48px;margin-bottom:0;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.06);border-radius:16px;padding:28px 0;backdrop-filter:blur(4px);max-width:560px;width:100%;position:relative}
.hero .hero-stats::after{content:"";position:absolute;top:-1px;left:50%;transform:translateX(-50%);width:60px;height:1px;background:linear-gradient(90deg,transparent,rgba(232,148,74,.4),transparent)}
.hero .hero-stats .hs-item{text-align:center;flex:1;position:relative}
.hero .hero-stats .hs-item+.hs-item::before{content:"";position:absolute;left:0;top:20%;bottom:20%;width:1px;background:rgba(255,255,255,.08)}
.hero .hero-stats .hs-num{font-size:32px;font-weight:800;color:#fff;letter-spacing:1px}
.hero .hero-stats .hs-num b{color:#E8944A;font-weight:800}
.hero .hero-stats .hs-label{font-size:12px;color:rgba(255,255,255,.4);margin-top:6px;letter-spacing:.5px}
.hero .scroll-hint{position:absolute;bottom:80px;left:0;right:0;padding-bottom:0;display:flex;flex-direction:column;align-items:center;gap:6px;color:rgba(255,255,255,.35);font-size:12px;cursor:pointer;animation:scrollBounce 2s ease-in-out infinite;z-index:1;transition:color .2s}
.hero .scroll-hint:hover{color:rgba(255,255,255,.7)}
.hero .scroll-hint .scroll-arrow{width:18px;height:18px;border-right:1.5px solid rgba(255,255,255,.3);border-bottom:1.5px solid rgba(255,255,255,.3);transform:rotate(45deg)}
@keyframes scrollBounce{0%,100%{transform:translateY(0)}50%{transform:translateY(8px)}}

/* Image hover for sol-img */
.sol-img[style*="zoom-in"]{transition:box-shadow .2s}
.sol-img[style*="zoom-in"]:hover{box-shadow:0 0 0 3px var(--amber-400);box-shadow:0 0 0 3px rgba(232,148,74,.5)}
.sol-img[style*="zoom-in"]:hover img{transform:scale(1.02);transition:transform .2s}

/* Gallery placeholder */
.gallery-placeholder{border-radius:var(--radius);border:1px dashed var(--gray-300);aspect-ratio:16/10;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:var(--gray-400);font-size:13px;background:var(--bg3)}

/* CTA Modal */
.cta-modal{position:fixed;inset:0;z-index:9998;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .25s}
.cta-modal.show{opacity:1;pointer-events:auto}
.cta-modal-box{position:relative;background:#fff;border-radius:16px;padding:40px 36px 32px;text-align:center;max-width:360px;width:90%;box-shadow:0 20px 60px rgba(0,0,0,.25);transform:scale(.9);transition:transform .25s}
.cta-modal.show .cta-modal-box{transform:scale(1)}
.cta-modal-box h3{font-size:20px;font-weight:700;color:#1b3a4b;margin-bottom:6px}
.cta-modal-box p{font-size:14px;color:var(--gray-500);margin-bottom:24px}
.cta-modal-box img{width:200px;height:200px;border-radius:8px;margin:0 auto 16px;display:block;border:1px solid var(--gray-200)}
.cta-modal-box .close-modal{position:absolute;top:16px;right:20px;background:none;border:none;font-size:24px;color:var(--gray-400);cursor:pointer;line-height:1}
.cta-modal-box .close-modal:hover{color:var(--gray-700)}

/* Index-only inline style classes */
.section-mb{margin-bottom:48px}
.hero-subtitle{color:#1b3a4b}
.welcome-sm h1{font-size:22px}
.modal-hint{font-size:13px;color:var(--gray-400);margin-bottom:0}
.modal-company{margin-top:20px;padding-top:16px;border-top:1px solid var(--gray-200)}
.modal-company-name{font-size:12px;color:var(--gray-500);margin-bottom:4px;font-weight:600;text-decoration:none;display:block}
.modal-company-product{font-size:11px;color:var(--gray-400);margin-bottom:0;text-decoration:none;display:block}

/* Loading */
.page-loading{text-align:center;padding:80px 0;color:var(--steel-500, #5a7a8a);font-size:16px}

/* Search result cards */
.search-result-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin-bottom:16px;cursor:pointer;transition:box-shadow .2s,border-color .2s}
.search-result-card:hover{box-shadow:0 4px 16px rgba(0,0,0,.08);border-color:var(--amber-400)}
.search-snippet{color:var(--t2);font-size:14px;line-height:1.6;margin:0}
.search-card-effect{margin-top:8px;font-size:13px;color:var(--t3)}

/* Override .page-wrap max-width when loaded inside #content */
#content .page-wrap{max-width:none;margin:0;padding:0}

/* ==================== Responsive ==================== */

/* Tablet (≤1200px) */
@media(max-width:1200px){
  .header{padding:0 24px;gap:20px}
  .logo{margin-left:0}
  .sidebar{width:260px}
  .content{padding:24px 28px 48px}
}

/* Small desktop / large tablet (≤900px) */
@media(max-width:900px){
  .header{padding:0 16px;gap:12px}
  .logo{margin-left:0;gap:8px}
  .logo-text{font-size:15px;letter-spacing:0}
  .menu-btn{display:block}
  .sidebar{position:fixed;left:-280px;top:64px;z-index:200;transition:left .3s;height:calc(100vh - 64px);width:280px;box-shadow:4px 0 20px rgba(0,0,0,.1)}
  .sidebar.open{left:0}
  .overlay.show{display:block}
  .content{padding:20px 20px 40px;min-height:calc(100vh - 64px)}
  .cards-grid{grid-template-columns:1fr}
  .stats-bar{flex-wrap:wrap}
  .stat-item{flex:1 1 50%}
  .stat-item:nth-child(2)::after{display:none}
  .stat-item:nth-child(1),.stat-item:nth-child(2){border-bottom:1px solid var(--border)}
  .stat-item .num{font-size:24px}
  .L1-header{padding:16px 18px}
  .L1-header h2{font-size:19px}
  .detail-layout{grid-template-columns:1fr;gap:20px}
  .detail-layout .detail-pain{border-radius:var(--radius2);padding-right:32px}
  .detail-layout .detail-sol{border-radius:var(--radius2);padding-left:32px}
  .detail-sol .sol-label{float:none}
  .detail-sol h3{text-align:left}
  .detail-sol .sol-list li{text-align:left;padding:10px 0 10px 24px}
  .detail-sol .sol-list li::before{right:auto;left:0}
  .welcome{padding:36px 16px}
  .welcome h1{font-size:22px}
  .hero{padding:calc(64px + 24px) 24px 80px}
  .hero h1{font-size:28px;letter-spacing:0}
  .hero p{font-size:15px}
  .hero .hero-stats{max-width:100%;border-radius:12px;padding:20px 0}
  .hero .hero-stats .hs-num{font-size:26px}
  .hero .hero-badge{font-size:12px;padding:5px 14px;margin-bottom:24px}
}

/* Mobile (≤640px) */
@media(max-width:640px){
  .header{padding:0 12px;gap:8px;height:56px}
  .logo{gap:6px;margin-left:0}
  .logo-icon{width:36px;height:36px}
  .logo-text{font-size:13px;letter-spacing:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:140px}
  .header-search-btn{padding:4px}
  .header-search-btn svg{width:16px;height:16px}
  .header .cta-btn{padding:6px 12px;font-size:12px;border-radius:16px;gap:4px}
  .header .cta-btn svg{width:12px;height:12px}
  .menu-btn{font-size:20px;padding:2px}
  .sidebar{top:56px;height:calc(100vh - 56px);left:-260px;width:260px}
  .content{padding:16px 14px 32px;min-height:calc(100vh - 56px)}
  .content-search{margin:0 0 12px;border-radius:32px}
  .content-search input{padding:12px 12px 12px 12px;font-size:14px}
  .content-search .cs-icon{width:40px;height:40px}
  .content-search .cs-icon svg{width:14px;height:14px}
  .content-search .cs-btn{padding:7px 16px;font-size:12px;border-radius:20px;margin:3px 4px 3px 0}
  .content-quick-tags{gap:6px;margin-top:20px}
  .content-quick-tags span{font-size:11px;padding:4px 10px}
  .cards-grid{grid-template-columns:1fr;gap:12px}
  .card{padding:16px}
  .card h4{font-size:14px}
  .card .solution-list li{font-size:12px}
  .stats-bar{flex-wrap:wrap}
  .stat-item{flex:1 1 50%;padding:16px 8px}
  .stat-item:nth-child(2)::after{display:none}
  .stat-item:nth-child(1),.stat-item:nth-child(2){border-bottom:1px solid var(--border)}
  .stat-item .num{font-size:20px}
  .stat-item .label{font-size:11px}
  .stat-item .num .ai-badge{font-size:11px;padding:2px 6px}
  .welcome{padding:24px 12px}
  .welcome h1{font-size:18px}
  .welcome p{font-size:13px;margin-bottom:20px}
  .search-result-card{padding:14px 16px}
  .L1-header{padding:14px 14px;gap:10px}
  .L1-header .badge{width:34px;height:34px;font-size:14px;border-radius:8px}
  .L1-header h2{font-size:17px}
  .L1-header p{font-size:13px}
  .L2-header{padding:12px 14px}
  .L2-header h3{font-size:14px}
  .detail-section{padding:20px 18px;margin-bottom:14px}
  .detail-section h3{font-size:17px}
  .detail-section p{font-size:14px;line-height:1.8}
  .detail-section .item-list li{font-size:13px;padding:8px 0 8px 20px}
  .goal-effects{grid-template-columns:1fr;gap:8px}
  .goal-effect-item{font-size:13px;padding:8px 12px}
  .hero{padding:calc(56px + 20px) 16px 60px}
  .hero h1{font-size:22px}
  .hero p{font-size:14px;margin-bottom:28px}
  .hero .hero-badge{font-size:11px;padding:4px 12px;margin-bottom:20px}
  .hero .hero-stats{margin-top:32px;padding:16px 0;max-width:100%}
  .hero .hero-stats .hs-num{font-size:22px}
  .hero .hero-stats .hs-label{font-size:11px}
  .hero .scroll-hint span{font-size:11px}
  .hero .scroll-hint .scroll-arrow{width:14px;height:14px}
  .content-title{font-size:22px}
  .breadcrumb{font-size:12px}
  .page-loading{padding:60px 0;font-size:14px}
}

/* Small phones (≤480px) */
@media(max-width:480px){
  .logo-text{max-width:100px}
  .header .cta-btn span{display:none}
  .hero h1{font-size:19px}
  .hero .hero-stats{flex-wrap:wrap;gap:0}
  .hero .hero-stats .hs-item{flex:1 1 40%}
  .hero .hero-stats .hs-item:nth-child(3)::before{display:none}
  .stats-bar{grid-template-columns:repeat(2,1fr);gap:8px}
  .stat-item{padding:12px 6px}
  .stat-item .num{font-size:20px}
  .cards-grid{grid-template-columns:1fr;gap:10px}
  .quick-tags{gap:5px}
  .quick-tag{padding:4px 10px;font-size:11.5px}
  .content-quick-tags{gap:5px}
  .content-quick-tags span{font-size:11px;padding:3px 8px}
}

/* Footer */
.site-footer{width:100%;background:var(--steel-900);color:var(--steel-100);padding:20px 40px;font-size:13px;border-top:1px solid var(--steel-800)}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:8px;max-width:1400px;margin:0 auto;text-align:center}
.footer-copy{color:var(--gray-300)}
.footer-links{display:flex;align-items:center;gap:10px}
.footer-links-label{color:var(--gray-400)}
.footer-links a{color:var(--steel-500);text-decoration:none;transition:color .2s}
.footer-links a:hover{color:var(--amber-400)}
@media(max-width:900px){
  .site-footer{padding:18px 16px}
  .footer-inner{flex-direction:column;text-align:center}
}