:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --bg: #fafbff;
  --card: #ffffff;
  --text: #111827;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --radius: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.04);
  --shadow: 0 4px 20px rgba(0,0,0,.05);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.08);
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family:'Inter',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif; background:var(--bg); color:var(--text); line-height:1.65; -webkit-font-smoothing:antialiased; }

/* Hero - Light modern */
.hero { background:linear-gradient(160deg,#f8f9ff 0%,#eef0ff 40%,#e8ecff 100%); padding:72px 24px 56px; text-align:center; position:relative; overflow:hidden; }
.hero::before { content:''; position:absolute; top:-120px; right:-120px; width:400px; height:400px; background:radial-gradient(circle,rgba(99,102,241,.12) 0%,transparent 70%); border-radius:50%; }
.hero::after { content:''; position:absolute; bottom:-80px; left:-80px; width:300px; height:300px; background:radial-gradient(circle,rgba(139,92,246,.08) 0%,transparent 70%); border-radius:50%; }
.hero-inner { position:relative; max-width:720px; margin:0 auto; }
.hero-badge { display:inline-flex; align-items:center; gap:6px; background:#fff; border:1px solid var(--border); padding:6px 18px; border-radius:30px; font-size:.82em; font-weight:600; color:var(--primary); margin-bottom:28px; box-shadow:var(--shadow-sm); }
.hero h1 { font-size:2.6em; font-weight:800; line-height:1.25; color:var(--text); margin-bottom:16px; letter-spacing:-.02em; }
.hero-accent { color:var(--primary); }
.hero-sub { font-size:1em; color:var(--text-secondary); max-width:520px; margin:0 auto 36px; }
.hero-tags { display:flex; justify-content:center; gap:12px; flex-wrap:wrap; }
.hero-tag { background:#fff; border:1px solid var(--border); padding:8px 20px; border-radius:12px; font-size:.88em; font-weight:500; color:var(--text); box-shadow:var(--shadow-sm); }
.hero-tag span { color:var(--primary); font-weight:700; }

/* Value Bar - Split Comparison */
.value-bar { background:#f9fafb; padding:60px 24px; }
.value-bar-inner { max-width:1200px; margin:0 auto; }
.split-container { display:flex; height:400px; border-radius:16px; overflow:hidden; box-shadow:0 10px 40px rgba(0,0,0,.1); }

/* 左侧：人工方式 */
.left-side { flex:1; background:linear-gradient(135deg, #4b5563, #6b7280); padding:50px 40px; display:flex; flex-direction:column; justify-content:center; position:relative; }
.left-side::after { content:''; position:absolute; top:0; left:0; right:0; bottom:0; background:rgba(0,0,0,.2); }
.left-content { position:relative; z-index:1; color:#fff; }
.side-label { font-size:1.1em; font-weight:700; margin-bottom:30px; opacity:.9; }
.pain-item { margin-bottom:25px; }
.pain-title { font-size:1.3em; font-weight:700; margin-bottom:8px; }
.pain-desc { font-size:.95em; opacity:.85; line-height:1.5; }
.pain-desc strong { font-size:1.2em; color:#fca5a5; font-weight:900; }

/* 中间分隔 */
.divider { width:80px; background:#fff; display:flex; align-items:center; justify-content:center; font-size:2.8em; font-weight:900; color:#6366f1; position:relative; box-shadow:0 0 20px rgba(99,102,241,.3); }
.divider::before { content:''; position:absolute; left:0; top:50%; transform:translateY(-50%); width:0; height:0; border-top:20px solid transparent; border-bottom:20px solid transparent; border-left:20px solid #6b7280; }
.divider::after { content:''; position:absolute; right:0; top:50%; transform:translateY(-50%); width:0; height:0; border-top:20px solid transparent; border-bottom:20px solid transparent; border-right:20px solid #10b981; }

/* 右侧：AI方式 */
.right-side { flex:1; background:linear-gradient(135deg, #10b981, #34d399); padding:50px 40px; display:flex; flex-direction:column; justify-content:center; }
.right-content { color:#fff; }
.advantage-item { margin-bottom:25px; }
.advantage-title { font-size:1.3em; font-weight:700; margin-bottom:8px; }
.advantage-desc { font-size:.95em; opacity:.95; line-height:1.5; }
.highlight { font-size:1.3em; font-weight:900; color:#fef3c7; text-shadow:0 1px 3px rgba(0,0,0,.2); }

/* Tabs */
.tabs { display:flex; justify-content:center; background:#fff; border-bottom:1px solid var(--border); position:sticky; top:0; z-index:100; }
.tab { padding:16px 40px; cursor:pointer; font-size:.95em; font-weight:600; color:var(--text-secondary); border-bottom:2px solid transparent; transition:all .2s; user-select:none; }
.tab:hover { color:var(--text); }
.tab.active { color:var(--primary); border-bottom-color:var(--primary); }
.tab-content { display:none; }
.tab-content.active { display:block; }

/* Container */
.container { max-width:1080px; margin:0 auto; padding:48px 24px; }
.sec-title { font-size:1.4em; font-weight:700; margin-bottom:6px; }
.sec-desc { color:var(--text-secondary); margin-bottom:28px; font-size:.92em; }

/* Overview Grid */
.overview-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin-bottom:48px; }
.ov-card { background:var(--card); border-radius:12px; padding:18px 16px; box-shadow:var(--shadow-sm); border:1px solid var(--border); transition:all .25s; cursor:default; }
.ov-card:hover { box-shadow:var(--shadow); transform:translateY(-3px); border-color:transparent; }
.ov-icon { font-size:1.5em; margin-bottom:8px; }
.ov-name { font-weight:700; font-size:.9em; margin-bottom:6px; color:var(--text); display:flex; align-items:center; gap:6px; }
.ov-count { display:inline-flex; align-items:center; justify-content:center; background:var(--primary); color:#fff; font-size:.7em; font-weight:700; min-width:18px; height:18px; padding:0 5px; border-radius:9px; }
.ov-value { font-size:.86em; font-weight:700; color:var(--primary); margin-bottom:4px; }
.ov-people { font-size:.8em; color:#dc2626; font-weight:600; margin-bottom:4px; line-height:1.3; }
.ov-effect { font-size:.8em; color:#6b7280; line-height:1.3; }

/* Case Card */
.case-card { background:var(--card); border-radius:var(--radius); margin-bottom:28px; box-shadow:var(--shadow-sm); border:1px solid var(--border); overflow:hidden; transition:box-shadow .25s; }
.case-card:hover { box-shadow:var(--shadow); }
.case-header { padding:24px 28px 0; }
.case-tag { display:inline-block; padding:3px 12px; border-radius:20px; font-size:.78em; font-weight:600; margin-bottom:8px; }
.tag-visual { background:#eef2ff; color:#4338ca; }
.tag-detail { background:#e0f2fe; color:#0369a1; }
.tag-copy { background:#fef9c3; color:#854d0e; }
.tag-service { background:#fce7f3; color:#be185d; }
.tag-data { background:#d1fae5; color:#065f46; }
.tag-cross { background:#ede9fe; color:#6d28d9; }
.tag-pack { background:#ffedd5; color:#c2410c; }
.case-title { font-size:1.2em; font-weight:700; margin-bottom:4px; }
.case-meta { color:var(--text-secondary); font-size:.85em; margin-bottom:14px; }

/* Images */
.case-images { padding:0 28px 16px; }
.img-row { display:flex; gap:10px; overflow-x:auto; }
.img-wrap { position:relative; flex-shrink:0; border-radius:12px; overflow:hidden; border:1px solid var(--border); cursor:pointer; background:#f9fafb; }
.img-wrap img { display:block; max-height:340px; width:auto; max-width:100%; }
.img-wrap.full img { width:100%; max-height:460px; object-fit:contain; }
.img-label { position:absolute; top:8px; left:8px; padding:3px 10px; border-radius:6px; font-size:.72em; font-weight:700; }
.label-before { background:rgba(239,68,68,.9); color:#fff; }
.label-after { background:rgba(34,197,94,.9); color:#fff; }
.label-compare { background:rgba(59,130,246,.9); color:#fff; }
.label-demo { background:rgba(139,92,246,.9); color:#fff; }
.no-image { padding:20px 28px; background:#fafbfc; color:var(--text-secondary); font-size:.88em; border-top:1px solid #f3f4f6; }

/* Case Body & Compare */
.case-body { padding:0 28px 16px; }
.compare-row { display:flex; gap:0; align-items:stretch; border-radius:12px; overflow:hidden; border:1px solid var(--border); margin-bottom:16px; }
.compare-side { flex:1; padding:18px 20px; }
.side-before { background:#fafafa; border-right:none; }
.side-after { background:#f0fdf4; }
.side-badge { font-size:.78em; font-weight:700; color:#6b7280; margin-bottom:8px; display:inline-block; padding:2px 10px; background:#fff; border-radius:6px; border:1px solid #e5e7eb; }
.side-badge-ai { color:#16a34a; border-color:#86efac; background:#f0fdf4; }
.compare-side p { font-size:.88em; color:#374151; }
.side-effect { margin-top:10px; padding:8px 12px; background:rgba(22,163,74,.08); border-radius:8px; font-size:.88em; font-weight:700; color:#16a34a; }
.compare-arrow { display:flex; flex-direction:column; align-items:center; justify-content:center; padding:0 14px; background:linear-gradient(180deg,#fafafa,#f0fdf4); font-size:.75em; font-weight:800; color:var(--primary); gap:2px; }
.compare-arrow span { font-size:1.6em; }

/* Case Footer */
.case-footer { padding:14px 28px; border-top:1px solid #f3f4f6; font-size:.85em; color:#6b7280; background:#fafbfc; }
.fit-tag { display:inline-block; background:#fffbeb; color:#d97706; padding:2px 8px; border-radius:6px; font-size:.78em; font-weight:600; margin-right:4px; }

/* Info blocks - remove old */
.case-info { display:grid; grid-template-columns:1fr 1fr; }
.info-block { padding:18px 24px; }
.info-block:nth-child(1) { border-right:1px solid #f3f4f6; border-top:1px solid #f3f4f6; }
.info-block:nth-child(2) { border-top:1px solid #f3f4f6; }
.info-block:nth-child(3) { border-right:1px solid #f3f4f6; border-top:1px solid #f3f4f6; }
.info-block:nth-child(4) { border-top:1px solid #f3f4f6; }
.info-label { font-size:.7em; font-weight:700; text-transform:uppercase; letter-spacing:1.5px; margin-bottom:5px; }
.info-block.pain { background:#fef2f2; } .info-block.pain .info-label { color:#dc2626; }
.info-block.solution { background:#eff6ff; } .info-block.solution .info-label { color:#2563eb; }
.info-block.effect { background:#f0fdf4; } .info-block.effect .info-label { color:#16a34a; }
.info-block.fit { background:#fffbeb; } .info-block.fit .info-label { color:#d97706; }
.info-block p { font-size:.88em; color:#374151; }

/* Lightbox */
.img-overlay { display:none; position:fixed; inset:0; background:rgba(0,0,0,.88); z-index:1000; align-items:center; justify-content:center; backdrop-filter:blur(4px); }
.img-overlay.show { display:flex; }
.img-overlay img { max-width:94%; max-height:94%; border-radius:8px; object-fit:contain; }
.lb-close { position:absolute; top:16px; right:24px; color:#fff; font-size:28px; cursor:pointer; opacity:.6; transition:opacity .2s; width:40px; height:40px; display:flex; align-items:center; justify-content:center; border-radius:50%; background:rgba(255,255,255,.1); }
.lb-close:hover { opacity:1; }

/* Flow Steps */
.flow-wrap { display:flex; align-items:stretch; gap:0; margin-bottom:48px; }
.flow-card { flex:1; background:var(--card); border-radius:14px; padding:24px 20px; box-shadow:var(--shadow-sm); border:1px solid var(--border); }
.flow-arrow { display:flex; align-items:center; padding:0 6px; color:var(--primary); font-size:1.4em; opacity:.4; }
.step-badge { width:36px; height:36px; background:var(--primary); color:#fff; border-radius:10px; display:flex; align-items:center; justify-content:center; font-weight:800; margin-bottom:12px; }
.flow-card h3 { font-size:1.05em; font-weight:700; margin-bottom:4px; }
.step-time { background:#eef2ff; color:var(--primary); padding:2px 10px; border-radius:8px; font-size:.75em; font-weight:600; margin-left:6px; }
.flow-card .step-desc { color:var(--text-secondary); font-size:.88em; margin:8px 0; }
.step-output { padding:10px 12px; background:#fafbff; border-left:3px solid var(--primary); border-radius:0 8px 8px 0; font-size:.82em; color:#4b5563; margin-top:10px; }

/* Form */
.form-section { background:var(--card); border-radius:var(--radius); padding:32px; box-shadow:var(--shadow-sm); border:1px solid var(--border); margin-bottom:28px; }
.form-section h3 { font-size:1.1em; font-weight:700; margin-bottom:18px; padding-bottom:10px; border-bottom:1px solid #f3f4f6; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-bottom:14px; }
.form-group { display:flex; flex-direction:column; margin-bottom:4px; }
.form-group label { font-size:.82em; font-weight:600; color:#374151; margin-bottom:5px; }
.form-group input,.form-group select,.form-group textarea { padding:9px 13px; border:1px solid var(--border); border-radius:10px; font-size:.9em; outline:none; transition:border .2s,box-shadow .2s; font-family:inherit; background:#fff; }
.form-group input:focus,.form-group select:focus,.form-group textarea:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(99,102,241,.08); }
.checkbox-group { display:flex; flex-wrap:wrap; gap:8px; }
.checkbox-group label { display:flex; align-items:center; gap:5px; font-size:.85em; padding:5px 13px; border:1px solid var(--border); border-radius:8px; cursor:pointer; transition:all .15s; }
.checkbox-group label:has(input:checked) { background:#eef2ff; border-color:var(--primary); color:var(--primary-dark); }
.checkbox-group input { display:none; }
.radio-group { display:flex; flex-wrap:wrap; gap:8px; }
.radio-group label { display:flex; align-items:center; gap:5px; font-size:.85em; padding:6px 14px; border:1px solid var(--border); border-radius:8px; cursor:pointer; transition:all .15s; }
.radio-group label:has(input:checked) { background:var(--primary); color:#fff; border-color:var(--primary); }
.radio-group input { display:none; }

/* Tables */
.data-table { width:100%; border-collapse:separate; border-spacing:0; font-size:.85em; margin:14px 0; border-radius:12px; overflow:hidden; border:1px solid var(--border); }
.data-table th { background:#f8f9fc; color:var(--text); padding:10px 14px; text-align:left; font-weight:600; border-bottom:1px solid var(--border); }
.data-table td { padding:9px 14px; border-bottom:1px solid #f9fafb; }
.data-table tr:last-child td { border-bottom:none; }
.data-table .highlight { background:#fafbff; }
.score-cell { font-weight:800; color:var(--primary); font-size:1.05em; }
.data-table input[type="text"],.data-table input[type="number"] { width:100%; padding:5px 9px; border:1px solid var(--border); border-radius:8px; font-size:.88em; }
.data-table input[type="number"] { width:56px; text-align:center; }

/* Buttons */
.btn { padding:9px 22px; border-radius:10px; font-size:.88em; font-weight:600; cursor:pointer; border:none; transition:all .15s; }
.btn-primary { background:var(--primary); color:#fff; }
.btn-primary:hover { background:var(--primary-dark); }
.btn-outline { background:#fff; border:1px solid var(--border); color:var(--text-secondary); }
.btn-outline:hover { border-color:var(--primary); color:var(--primary); }

/* Compare */
.compare-wrap { display:grid; grid-template-columns:1fr 1fr; gap:20px; margin:20px 0 40px; }
.compare-card { padding:22px; border-radius:14px; border:1px solid; }
.compare-card.old { background:#fef2f2; border-color:#fca5a5; }
.compare-card.new { background:#f0fdf4; border-color:#86efac; }
.compare-card h4 { font-size:.95em; font-weight:700; margin-bottom:8px; }
.compare-card.old h4 { color:#dc2626; }
.compare-card.new h4 { color:#16a34a; }
.compare-card p { font-size:.88em; color:#374151; line-height:1.7; }

/* Scene Grid */
.scene-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; margin-top:16px; }
.scene-card { background:var(--card); border:1px solid var(--border); border-radius:12px; padding:16px; text-align:center; transition:all .2s; }
.scene-card:hover { box-shadow:var(--shadow); transform:translateY(-2px); }
.sc-name { font-weight:600; font-size:.88em; margin-bottom:4px; }
.sc-effect { font-weight:700; font-size:1em; margin-bottom:2px; }
.sc-time { font-size:.75em; color:var(--text-secondary); }

/* Example box */
.example-box { background:#fafbff; border:1px dashed #c7d2fe; border-radius:14px; padding:22px; margin:16px 0; }
.example-box h4 { font-size:.95em; font-weight:700; margin-bottom:10px; color:var(--primary); }
.sop-note { padding:10px 14px; background:#f0fdf4; border-radius:8px; color:#16a34a; font-weight:600; font-size:.88em; margin-top:8px; }

/* Loading Spinner */
.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid #e5e7eb;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Responsive */
@media(max-width:768px) {
  .hero h1 { font-size:1.7em; }
  .overview-grid { grid-template-columns:repeat(2,1fr); }
  .case-info { grid-template-columns:1fr; }
  .info-block:nth-child(odd) { border-right:none; }
  .flow-wrap { flex-direction:column; }
  .flow-arrow { justify-content:center; transform:rotate(90deg); padding:6px 0; }
  .form-row { grid-template-columns:1fr; }
  .compare-wrap { grid-template-columns:1fr; }
  .scene-grid { grid-template-columns:repeat(2,1fr); }
  .tab { padding:12px 20px; font-size:.88em; }
  .case-header,.case-images,.case-body { padding-left:20px; padding-right:20px; }
  .compare-row { flex-direction:column; }
  .compare-arrow { flex-direction:row; padding:8px 0; }
  .case-footer { padding-left:20px; padding-right:20px; }
}