/* ============================================
   SEER Data to Top Oncology Journal
   Shared Stylesheet — Lancet-Inspired Dark Theme
   ============================================ */

/* Reset & Variables */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#A51C30;
  --primary-light:#c62240;
  --primary-dark:#7a1524;
  --accent:#E8475F;
  --bg:#0f172a;
  --bg-alt:#0b1120;
  --bg-card:#131c31;
  --bg-card-hover:#182240;
  --text:#e2e8f0;
  --text-muted:#94a3b8;
  --text-dim:#64748b;
  --border:#1e293b;
  --border-light:#2a3a52;
  --green:#10b981;
  --blue:#3b82f6;
  --amber:#f59e0b;
  --cyan:#06b6d4;
  --purple:#8b5cf6;
  --shadow:0 4px 30px rgba(0,0,0,.4);
  --radius:12px;
  --radius-lg:16px;
  --radius-sm:8px;
  --max-w:1200px;
  --nav-h:56px;
  --font:-apple-system,BlinkMacSystemFont,'SF Pro Display','Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}

html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.7;font-size:16px;overflow-x:hidden}
body{padding-top:var(--nav-h)}

a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-light)}

.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}

/* Typography */
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.25;color:#fff}
h1{font-size:clamp(2.2rem,5vw,3.5rem)}
h2{font-size:clamp(1.6rem,3.5vw,2.4rem)}
h3{font-size:1.3rem}
h4{font-size:1.1rem}
p.lead{font-size:1.15rem;color:var(--text-muted);max-width:640px}

.section{padding:80px 0}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{margin-bottom:12px}
.section-header p{color:var(--text-muted);max-width:600px;margin:0 auto;font-size:1.05rem}
.section-header .badge{display:inline-block;background:rgba(165,28,48,.15);color:var(--accent);padding:4px 14px;border-radius:20px;font-size:.8rem;font-weight:600;margin-bottom:12px;border:1px solid rgba(165,28,48,.25)}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius-sm);font-weight:600;font-size:.95rem;cursor:pointer;transition:all .25s;border:none;text-decoration:none;line-height:1.4}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 20px rgba(165,28,48,.3)}
.btn-primary:hover{background:var(--primary-light);transform:translateY(-2px);box-shadow:0 6px 25px rgba(165,28,48,.4);color:#fff}
.btn-secondary{background:transparent;color:var(--text);border:1.5px solid var(--border)}
.btn-secondary:hover{border-color:var(--primary);color:var(--accent);transform:translateY(-2px)}
.btn-sm{padding:8px 18px;font-size:.85rem}
.btn-lg{padding:16px 36px;font-size:1.05rem}

/* Cards */
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;transition:all .3s}
.card:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:0 8px 30px rgba(165,28,48,.08)}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;text-align:center}
.stat-num{font-size:2.4rem;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-label{color:var(--text-muted);font-size:.85rem;margin-top:4px}

/* Feature Grid */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;transition:all .3s}
.feature-card:hover{border-color:var(--primary);transform:translateY(-3px)}
.feature-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.4rem;margin-bottom:16px;background:rgba(165,28,48,.12);color:var(--accent)}
.feature-card h3{font-size:1.15rem;margin-bottom:8px}
.feature-card p{color:var(--text-muted);font-size:.9rem}

/* Cards Grid */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}

/* Tables */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse}
table th{background:var(--bg-card);color:var(--text);font-weight:600;font-size:.85rem;padding:12px 16px;text-align:left;border-bottom:1px solid var(--border);position:sticky;top:0}
table td{padding:10px 16px;font-size:.88rem;color:var(--text-muted);border-bottom:1px solid var(--border)}
table tr:last-child td{border-bottom:none}
table tr:hover td{background:rgba(165,28,48,.04)}

/* Code */
code,.code{font-family:'SF Mono','Fira Code','Cascadia Code',Consolas,monospace;background:var(--bg-alt);padding:2px 6px;border-radius:4px;font-size:.85em;color:var(--accent)}
pre{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);padding:20px;overflow-x:auto;font-family:'SF Mono','Fira Code',Consolas,monospace;font-size:.85rem;color:var(--text-muted);line-height:1.6}
pre code{background:none;padding:0;color:inherit}

/* Form Elements */
input,select,textarea{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;color:var(--text);font-size:.9rem;font-family:var(--font);transition:border-color .2s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary)}
select{cursor:pointer}

/* Badges & Tags */
.tag{display:inline-block;background:rgba(165,28,48,.12);color:var(--accent);padding:3px 10px;border-radius:20px;font-size:.75rem;font-weight:600;border:1px solid rgba(165,28,48,.2)}
.tag-green{background:rgba(16,185,129,.1);color:var(--green);border-color:rgba(16,185,129,.2)}
.tag-blue{background:rgba(59,130,246,.1);color:var(--blue);border-color:rgba(59,130,246,.2)}
.tag-amber{background:rgba(245,158,11,.1);color:var(--amber);border-color:rgba(245,158,11,.2)}

/* Divider */
.divider{height:1px;background:var(--border);margin:48px 0}

/* Footer */
.footer{background:var(--bg-alt);border-top:1px solid var(--border);padding:40px 0}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.footer-links{display:flex;gap:20px;flex-wrap:wrap}
.footer-links a{color:var(--text-dim);font-size:.85rem}
.footer-links a:hover{color:var(--accent)}
.footer-copy{color:var(--text-dim);font-size:.82rem}

/* Animations */
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.fade-up{animation:fadeUp .6s ease both}
.fade-up-d1{animation-delay:.1s}
.fade-up-d2{animation-delay:.2s}
.fade-up-d3{animation-delay:.3s}
.fade-up-d4{animation-delay:.4s}

@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
.pulse{animation:pulse 2s infinite}

/* Responsive */
@media(max-width:768px){
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{flex-direction:column;text-align:center}
  .section{padding:60px 0}
  .container{padding:0 16px}
}

@media(max-width:480px){
  .stats-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .cards-grid{grid-template-columns:1fr}
}

/* Scrollbar */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--text-dim)}

/* Selection */
::selection{background:var(--primary);color:#fff}

/* OPC Floating Nav */
#opc-eco-nav{position:fixed;bottom:20px;right:20px;z-index:999;background:rgba(15,23,42,.95);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:14px;padding:12px 14px;box-shadow:var(--shadow);min-width:180px;transition:all .3s}
#opc-eco-nav:hover{border-color:var(--primary)}
#opc-eco-nav .eco-title{font-size:.65rem;color:var(--text-dim);text-transform:uppercase;letter-spacing:.08rem;padding:2px 8px 8px;border-bottom:1px solid var(--border);margin-bottom:6px;font-weight:600}
#opc-eco-nav a{display:block;padding:4px 8px;color:var(--text-muted);font-size:.8rem;border-radius:6px;transition:all .15s}
#opc-eco-nav a:hover{background:rgba(165,28,48,.1);color:var(--accent)}

/* Hero Section */
.hero{min-height:80vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:80px 24px;background:radial-gradient(ellipse at 50% 0%,rgba(165,28,48,.08) 0%,transparent 60%)}
.hero h1 .hl{background:linear-gradient(135deg,var(--accent),var(--primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero .sub{font-size:1.15rem;color:var(--text-muted);max-width:620px;margin:0 auto 32px}
.hero .btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* Pricing */
.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;max-width:1000px;margin:0 auto}
.pricing-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:36px 28px;position:relative;transition:all .3s}
.pricing-card:hover{transform:translateY(-4px)}
.pricing-card.featured{border-color:var(--primary);box-shadow:0 0 40px rgba(165,28,48,.12)}
.pricing-card .popular{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;padding:4px 18px;border-radius:20px;font-size:.75rem;font-weight:600;white-space:nowrap}
.pricing-card .tier{font-size:.95rem;font-weight:600;color:var(--text-muted);margin-bottom:8px}
.pricing-card .price{font-size:2.8rem;font-weight:800;color:#fff;margin-bottom:4px}
.pricing-card .price .unit{font-size:1rem;color:var(--text-dim);font-weight:400}
.pricing-card .desc{color:var(--text-dim);font-size:.85rem;margin-bottom:24px}
.pricing-card ul{list-style:none;margin-bottom:28px}
.pricing-card li{color:var(--text-muted);font-size:.88rem;padding:6px 0;padding-left:24px;position:relative}
.pricing-card li::before{content:'';position:absolute;left:0;top:13px;width:8px;height:8px;border-radius:50%;background:var(--primary)}
.pricing-card .btn{width:100%;justify-content:center}

/* API Docs */
.api-endpoint{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px}
.api-endpoint:hover{border-color:var(--primary)}
.api-method{display:inline-block;padding:3px 10px;border-radius:4px;font-size:.75rem;font-weight:700;margin-right:10px;font-family:monospace}
.api-method.get{background:rgba(16,185,129,.15);color:var(--green)}
.api-method.post{background:rgba(59,130,246,.15);color:var(--blue)}
.api-path{font-family:monospace;font-size:.95rem;color:var(--text)}
.api-desc{color:var(--text-muted);font-size:.88rem;margin-top:8px}

/* Guide / Tutorial */
.guide-toc{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:32px;position:sticky;top:70px}
.guide-toc h4{font-size:.9rem;margin-bottom:12px;color:var(--text-muted)}
.guide-toc a{display:block;padding:6px 12px;color:var(--text-muted);font-size:.85rem;border-radius:6px;border-left:2px solid transparent;transition:all .2s}
.guide-toc a:hover,.guide-toc a.active{color:var(--accent);border-left-color:var(--primary);background:rgba(165,28,48,.05)}
.guide-section{margin-bottom:40px}
.guide-section h3{font-size:1.3rem;margin-bottom:16px;padding-bottom:8px;border-bottom:1px solid var(--border)}

/* Comparison Table */
.comparison{max-width:900px;margin:0 auto;overflow-x:auto}
.comparison table{width:100%;border-collapse:collapse}
.comparison th,.comparison td{padding:1rem;text-align:center;border-bottom:1px solid var(--border);font-size:.9rem}
.comparison th{color:var(--text);font-weight:700;background:var(--bg-card)}
.comparison th:first-child,.comparison td:first-child{text-align:left}
.comparison td{color:var(--text-muted)}
.comparison .check{color:var(--green);font-weight:700}
.comparison .cross{color:#475569}
.comparison tr:hover td{background:rgba(165,28,48,.03)}
.comparison .highlight-col{background:rgba(165,28,48,.05)}

/* FAQ */
.faq-grid{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem 2rem;margin-bottom:1rem;cursor:pointer;transition:all .3s}
.faq-item:hover{border-color:var(--primary)}
.faq-item h3{font-size:1rem;font-weight:600;color:var(--text);margin-bottom:0;display:flex;justify-content:space-between;align-items:center}
.faq-item h3::after{content:'+';font-size:1.3rem;color:var(--accent);transition:transform .3s}
.faq-item.open h3::after{content:'\2212'}
.faq-item p{color:var(--text-muted);font-size:.9rem;line-height:1.6;margin-top:.75rem;display:none}
.faq-item.open p{display:block}

/* CTA Section */
.cta-section{text-align:center;padding:5rem 2rem;background:linear-gradient(135deg,rgba(165,28,48,.08),rgba(232,71,95,.06))}
.cta-section h2{font-size:2rem;font-weight:800;color:var(--text);margin-bottom:.75rem}
.cta-section p{color:var(--text-muted);margin-bottom:2rem;font-size:1.1rem}

/* Gradient bg sections */
.section-alt{background:var(--bg-alt)}
.section-gradient{background:radial-gradient(ellipse at 50% 50%,rgba(165,28,48,.06) 0%,transparent 70%)}

/* Team / Role cards */
.role-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px}

/* Modal */
.modal-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.7);z-index:10000;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
.modal-overlay.active{display:flex}
.modal-content{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:32px;max-width:640px;width:90%;max-height:80vh;overflow-y:auto;position:relative}
.modal-close{position:absolute;top:16px;right:16px;background:rgba(255,255,255,.1);border:none;color:var(--text-muted);width:32px;height:32px;border-radius:8px;cursor:pointer;font-size:18px;display:flex;align-items:center;justify-content:center}
.modal-close:hover{background:rgba(255,255,255,.2);color:#fff}
.copy-btn{background:rgba(255,255,255,.1);border:none;color:var(--text-muted);padding:4px 12px;border-radius:6px;cursor:pointer;font-size:12px;transition:all .2s}
.copy-btn:hover{background:rgba(255,255,255,.2);color:#fff}

/* Param Table (API) */
.param-table{width:100%;border-collapse:collapse}
.param-table th{background:rgba(165,28,48,.1);padding:10px 12px;text-align:left;font-weight:600;font-size:.85rem;color:var(--text)}
.param-table td{padding:10px 12px;border-bottom:1px solid var(--border);font-size:.88rem;color:var(--text-muted)}

/* Tutorial cards */
.tutorial-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px;transition:all .3s}
.tutorial-card:hover{transform:translateY(-4px);border-color:var(--primary)}
.difficulty-beginner{background:var(--green);color:white;padding:4px 8px;border-radius:4px;font-size:12px;font-weight:600}
.difficulty-intermediate{background:var(--amber);color:white;padding:4px 8px;border-radius:4px;font-size:12px;font-weight:600}
.difficulty-advanced{background:var(--primary);color:white;padding:4px 8px;border-radius:4px;font-size:12px;font-weight:600}

/* Try It Button */
.try-it-btn{background:linear-gradient(135deg,var(--green),#10b981);color:white;padding:6px 16px;border-radius:8px;font-size:12px;font-weight:600;cursor:pointer;border:none;transition:all .2s}
.try-it-btn:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(5,150,105,.4)}