/* ══════════════════════════════════════════════
   SPARK-XC — Shared Styles
   Shared across all pages. Page-specific styles
   remain in each HTML file's <style> block.
   ══════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
  --amber: #F59E0B;
  --amber-light: #FEF3C7;
  --amber-mid: #FDE68A;
  --orange: #EA580C;
  --navy: #0C1628;
  --navy-mid: #1E293B;
  --slate: #475569;
  --slate-light: #64748B;
  --border: #E2E8F0;
  --border-strong: #CBD5E1;
  --bg: #FFFFFF;
  --bg-soft: #F8FAFC;
  --bg-amber: #FFFBEB;
  --green: #10B981;
  --red: #EF4444;
  --blue: #3B82F6;
  --text: #0F172A;
  --radius: 12px;
  --nav-height: 56px;
}

/* ── Skip Link ── */
.skip-link {
  position: absolute; top: -100%; left: 50%; transform: translateX(-50%);
  background: var(--navy); color: #fff; padding: 0.6rem 1.25rem;
  border-radius: 0 0 8px 8px; font-size: 0.875rem; font-weight: 600;
  z-index: 300; text-decoration: none; transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* ── Reset ── */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .rd1, .rd2, .rd3 { transition-delay: 0s; }
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: "DM Sans", sans-serif;
  overflow-x: hidden;
  font-size: 16px;
  line-height: 1.6;
}

/* ── Navigation ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 3rem;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.logo-badge {
  background: var(--amber); color: var(--navy);
  font-size: 0.6rem; font-weight: 700; letter-spacing: 0.08em;
  padding: 0.15rem 0.45rem; border-radius: 4px; text-transform: uppercase;
}
nav ul { list-style: none; display: flex; gap: 2rem; align-items: center; }
nav a {
  text-decoration: none; color: var(--slate);
  font-size: 0.875rem; font-weight: 500; transition: color 0.2s;
}
nav a:hover { color: var(--navy); }
nav a.active {
  color: var(--navy); font-weight: 600;
  border-bottom: 2px solid var(--amber); padding-bottom: 2px;
}
.nav-cta {
  background: var(--navy) !important; color: #fff !important;
  padding: 0.55rem 1.25rem; border-radius: 8px;
  font-weight: 600 !important; font-size: 0.875rem !important;
  transition: all 0.2s !important; border-bottom: none !important;
}
.nav-cta:hover { background: var(--orange) !important; transform: translateY(-1px); }

/* ── Mobile Hamburger ── */
.hamburger {
  display: none; background: none; border: none; cursor: pointer;
  width: 36px; height: 36px; padding: 6px;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
}
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--navy);
  border-radius: 2px; transition: all 0.3s;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── Section Basics ── */
section { padding: 5rem 3rem; position: relative; }
.section-tag {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--orange); margin-bottom: 1rem;
}
.section-tag::before {
  content: ""; width: 20px; height: 2px;
  background: var(--amber); border-radius: 1px;
}
h2 {
  font-family: "Instrument Serif", serif;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15; letter-spacing: -0.02em;
  color: var(--navy); margin-bottom: 1rem;
}
h2 em { font-style: italic; color: var(--orange); }
h3 {
  font-family: "Instrument Serif", serif;
  font-size: 1.4rem; letter-spacing: -0.01em;
  color: var(--navy); margin-bottom: 0.5rem;
}

/* ── Buttons ── */
.btn-primary {
  background: var(--navy); color: #fff;
  font-family: "DM Sans", sans-serif; font-weight: 600; font-size: 0.9rem;
  padding: 0.8rem 1.75rem; border-radius: 8px; text-decoration: none;
  transition: all 0.2s; box-shadow: 0 1px 3px rgba(0,0,0,0.12);
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.btn-primary:hover {
  background: var(--orange); transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(234,88,12,0.3);
}
.btn-secondary {
  background: transparent; color: var(--navy);
  font-family: "DM Sans", sans-serif; font-weight: 600; font-size: 0.9rem;
  padding: 0.8rem 1.75rem; border-radius: 8px; text-decoration: none;
  border: 1px solid var(--border-strong); transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.btn-secondary:hover {
  border-color: var(--navy); background: var(--bg-soft);
  transform: translateY(-2px);
}

/* ── Page Hero ── */
.page-hero {
  padding: 9rem 3rem 5rem;
  background: linear-gradient(180deg, var(--bg-soft) 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.page-hero-mesh {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(245,158,11,0.1), transparent 60%),
    radial-gradient(ellipse 30% 40% at 85% 50%, rgba(234,88,12,0.06), transparent 50%);
}
.page-hero-dots {
  position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(circle, rgba(148,163,184,0.3) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}
.page-hero-inner { max-width: 760px; position: relative; z-index: 2; }
.page-hero h1 {
  font-family: "Instrument Serif", serif;
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  line-height: 1.1; letter-spacing: -0.03em;
  color: var(--navy); margin-bottom: 1.25rem;
}
.page-hero h1 em { font-style: italic; color: var(--orange); }
.page-hero p {
  font-size: 1.1rem; color: var(--slate);
  line-height: 1.8; max-width: 580px; margin-bottom: 2rem;
}

/* ── Cards ── */
.card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.75rem; transition: all 0.25s;
}
.card:hover {
  border-color: var(--amber);
  box-shadow: 0 8px 30px rgba(245,158,11,0.08);
  transform: translateY(-2px);
}

/* ── Dividers ── */
.divider { border: none; border-top: 1px solid var(--border); margin: 0; }

/* ── Reveal Animations ── */
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.rd1 { transition-delay: 0.1s; }
.rd2 { transition-delay: 0.2s; }
.rd3 { transition-delay: 0.3s; }

/* ── Noscript / no-JS fallback ── */
.no-js .reveal {
  opacity: 1; transform: none;
}

/* ── Footer ── */
footer {
  padding: 2rem 3rem; border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg);
}
.footer-brand { display: flex; align-items: center; gap: 0.5rem; }
.footer-brand-name {
  font-weight: 700; font-size: 1rem;
  color: var(--navy); text-decoration: none;
}
.footer-copy { font-size: 0.78rem; color: var(--slate-light); }
.footer-links { display: flex; gap: 1.75rem; }
.footer-links a {
  font-size: 0.78rem; color: var(--slate-light);
  text-decoration: none; transition: color 0.2s;
}
.footer-links a:hover { color: var(--navy); }

/* ── Responsive ── */
@media (max-width: 900px) {
  nav { padding: 0.9rem 1.5rem; }
  nav ul {
    display: none; position: fixed; top: var(--nav-height); left: 0; right: 0;
    background: rgba(255,255,255,0.98); backdrop-filter: blur(20px);
    flex-direction: column; padding: 1.5rem; gap: 1rem;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    max-height: calc(100vh - var(--nav-height)); overflow-y: auto;
  }
  nav ul.open { display: flex; }
  .hamburger { display: flex; }
  section { padding: 3.5rem 1.5rem; }
  .page-hero { padding: 7rem 1.5rem 3.5rem; }
  footer {
    flex-direction: column; gap: 1rem; text-align: center;
  }
  .footer-links { justify-content: center; }
}

/* ══════════════════════════════════════════════
   Shared Use-Case Styles
   Used by usecases-ai, usecases-enterprise,
   usecases-compliance, usecases-investors pages
   ══════════════════════════════════════════════ */
.uc-tab{padding:0.5rem 1.1rem;border-radius:8px;border:1px solid var(--border);background:var(--bg);font-size:0.82rem;font-weight:600;color:var(--slate);cursor:pointer;transition:all 0.2s;text-decoration:none;display:inline-flex;align-items:center;}
.uc-tab:hover{background:var(--bg-soft);border-color:var(--border-strong);color:var(--navy);}
.uc-tab.active{background:var(--amber);border-color:var(--amber);color:var(--navy);}
.sub-tabs{display:flex;gap:0.5rem;flex-wrap:wrap;margin-top:1.5rem;}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:5rem;align-items:start;max-width:1100px;margin:0 auto;}
.three-col{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;max-width:1100px;margin:0 auto;}
.two-col-narrow{display:grid;grid-template-columns:1.1fr 0.9fr;gap:5rem;align-items:center;max-width:1100px;margin:0 auto;}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;border-radius:14px;overflow:hidden;border:1px solid var(--border);margin-top:2.5rem;max-width:1100px;}
.stat-cell{background:var(--bg);padding:1.75rem;text-align:center;border-right:1px solid var(--border);}
.stat-cell:last-child{border-right:none;}
.stat-big{font-family:"Instrument Serif",serif;font-size:2.8rem;line-height:1;color:var(--navy);}
.stat-big span{color:var(--orange);}
.stat-lbl{font-size:0.75rem;color:var(--slate-light);font-weight:500;margin-top:0.3rem;text-transform:uppercase;letter-spacing:0.06em;}
.layer-badge{display:inline-flex;align-items:center;gap:0.4rem;font-size:0.72rem;font-weight:700;padding:0.25rem 0.65rem;border-radius:20px;border:1px solid;margin-right:0.4rem;margin-bottom:0.4rem;}
.lb-1{background:#FEF3C7;border-color:#FCD34D;color:#D97706;}
.lb-2{background:#FEE2E2;border-color:#FCA5A5;color:#DC2626;}
.lb-3{background:#DBEAFE;border-color:#93C5FD;color:#2563EB;}
.lb-4{background:#DCFCE7;border-color:#86EFAC;color:#16A34A;}
.lb-5{background:#EDE9FE;border-color:#C4B5FD;color:#7C3AED;}
.feature-row{display:flex;flex-direction:column;gap:1px;border-radius:14px;overflow:hidden;border:1px solid var(--border);max-width:1100px;margin:2rem auto 0;}
.fr-item{display:grid;grid-template-columns:1fr 1fr;background:var(--bg);border-bottom:1px solid var(--border);transition:background 0.2s;}
.fr-item:last-child{border-bottom:none;}
.fr-item:hover{background:var(--bg-soft);}
.fr-left{padding:1.5rem 2rem;border-right:1px solid var(--border);}
.fr-right{padding:1.5rem 2rem;}
.fr-title{font-weight:700;font-size:0.95rem;color:var(--navy);margin-bottom:0.4rem;}
.fr-body{font-size:0.84rem;color:var(--slate);line-height:1.7;}
.fr-label{font-size:0.7rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--slate-light);margin-bottom:0.3rem;}
.scenario-box{background:var(--bg-soft);border:1px solid var(--border);border-radius:14px;padding:1.75rem;margin-bottom:1.25rem;}
.scenario-tag{font-size:0.7rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--orange);margin-bottom:0.4rem;}
.scenario-title{font-weight:700;color:var(--navy);margin-bottom:0.6rem;font-size:0.95rem;}
.scenario-body{font-size:0.84rem;color:var(--slate);line-height:1.7;}
.scenario-result{margin-top:0.8rem;font-size:0.8rem;font-weight:600;color:var(--green);}
.dark-section{background:var(--navy);padding:5rem 3rem;}
.dark-section .section-tag{color:var(--amber);}
.dark-section .section-tag::before{background:var(--amber);}
.dark-section h2{color:#fff;}
.dark-section h2 em{color:var(--amber);}
.dark-card{background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.1);border-radius:14px;padding:1.75rem;transition:all 0.25s;}
.dark-card:hover{background:rgba(245,158,11,0.1);border-color:rgba(245,158,11,0.3);}
.dark-card-title{font-weight:700;color:#fff;margin-bottom:0.5rem;}
.dark-card-body{font-size:0.85rem;color:rgba(255,255,255,0.5);line-height:1.75;}
.dark-badge{display:inline-block;margin-top:0.9rem;font-size:0.7rem;font-weight:700;padding:0.22rem 0.6rem;border-radius:20px;background:rgba(245,158,11,0.15);color:var(--amber);border:1px solid rgba(245,158,11,0.3);}
.terminal{background:var(--navy);border-radius:14px;overflow:hidden;box-shadow:0 12px 40px rgba(12,22,40,0.2);}
.term-bar{display:flex;align-items:center;justify-content:space-between;padding:0.75rem 1.1rem;background:rgba(255,255,255,0.05);border-bottom:1px solid rgba(255,255,255,0.08);}
.term-dots{display:flex;gap:5px;}.term-dots span{width:9px;height:9px;border-radius:50%;}
.term-dots span:nth-child(1){background:#FF5F57;}.term-dots span:nth-child(2){background:#FEBC2E;}.term-dots span:nth-child(3){background:#28C840;}
.term-title{font-family:"JetBrains Mono",monospace;font-size:0.62rem;color:rgba(255,255,255,0.3);letter-spacing:0.1em;}
.term-body{padding:1.25rem;font-family:"JetBrains Mono",monospace;font-size:0.7rem;line-height:1.9;color:rgba(255,255,255,0.55);}
.t-ok{color:#34D399;}.t-warn{color:#FBBF24;}.t-crit{color:#F87171;}.t-hash{color:#60A5FA;}.t-dim{color:rgba(255,255,255,0.25);}
.checklist{list-style:none;display:flex;flex-direction:column;gap:0.7rem;margin-top:1rem;}
.checklist li{display:flex;gap:0.75rem;align-items:flex-start;font-size:0.875rem;color:var(--slate);line-height:1.6;}
.checklist li::before{content:"✓";color:var(--green);font-weight:700;flex-shrink:0;margin-top:1px;}
.callout{padding:1.5rem;border-radius:12px;background:var(--bg-amber);border:1px solid #FCD34D;margin-top:1.5rem;}
.callout-title{font-weight:700;color:var(--navy);margin-bottom:0.4rem;font-size:0.95rem;}
.callout-body{font-size:0.85rem;color:var(--slate);line-height:1.7;}
.cta-strip{background:linear-gradient(135deg,#FFFBEB,#FFF8F0);border-top:1px solid #FDE68A;text-align:center;padding:6rem 3rem;}
@media(max-width:900px){.two-col,.two-col-narrow,.three-col{grid-template-columns:1fr;}.stat-row{grid-template-columns:1fr 1fr;}.fr-item{grid-template-columns:1fr;}.fr-right{border-top:1px solid var(--border);}}