/* =========================================================
   DeFi.Explained — Professional stylesheet
   ========================================================= */

:root {
  --bg: #0b1020;
  --bg-2: #0f1530;
  --bg-alt: #0c1226;
  --surface: #121a37;
  --surface-2: #172247;
  --border: #1e2a55;
  --text: #eaf2ff;
  --muted: #9aa7c7;
  --muted-2: #7f8bab;
  --brand: #6ee7ff;
  --brand-2: #7c5cff;
  --accent: #5affc3;
  --danger: #ff7a7a;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-1: 0 8px 24px rgba(0,0,0,.35);
  --shadow-2: 0 18px 50px rgba(10,14,40,.55);
  --maxw: 1160px;
  --fs-body: clamp(15px, 1vw + 0.6rem, 17px);
  --fs-h1: clamp(2.1rem, 1.4rem + 3.2vw, 4rem);
  --fs-h2: clamp(1.6rem, 1.1rem + 1.8vw, 2.4rem);
  --fs-h3: 1.15rem;
  --ease: cubic-bezier(.2,.7,.2,1);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f9ff;
    --bg-2: #eef2fb;
    --bg-alt: #ffffff;
    --surface: #ffffff;
    --surface-2: #f3f6ff;
    --border: #e4e9f6;
    --text: #0c1226;
    --muted: #4b587a;
    --muted-2: #6a7592;
    --brand: #2665ff;
    --brand-2: #6a3cff;
    --accent: #14b886;
    --shadow-1: 0 8px 24px rgba(20,40,100,.08);
    --shadow-2: 0 20px 50px rgba(20,40,100,.12);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--text);
  background:
    radial-gradient(1200px 800px at 85% -10%, rgba(124,92,255,.18), transparent 60%),
    radial-gradient(1000px 700px at -10% 10%, rgba(110,231,255,.14), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; display: block; }

a { color: var(--brand); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--brand-2); }

.container { width: min(100% - 2.2rem, var(--maxw)); margin-inline: auto; }

.skip-link {
  position: absolute; left: -9999px;
  background: var(--brand); color: #000; padding: .5rem .8rem; border-radius: 6px;
}
.skip-link:focus { left: 1rem; top: 1rem; z-index: 1000; }

/* ============ Header / Nav ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  background: color-mix(in oklab, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; gap: 1rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .6rem;
  font-weight: 700; letter-spacing: .2px; font-size: 1.05rem;
  color: var(--text);
}
.brand-dot { color: var(--brand); }
.nav-links { display: flex; gap: 1.6rem; align-items: center; }
.nav-links a {
  color: var(--muted); font-weight: 500; font-size: .95rem;
  position: relative; padding: .3rem 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  transition: right .25s var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { right: 0; }

.nav-toggle {
  display: none; background: transparent; border: 0; cursor: pointer;
  width: 40px; height: 40px; padding: 10px; gap: 4px; flex-direction: column;
  justify-content: center;
}
.nav-toggle span {
  display: block; height: 2px; background: var(--text); border-radius: 2px;
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}

/* ============ Hero ============ */
.hero { padding: clamp(3rem, 6vw, 6rem) 0 clamp(3rem, 5vw, 5rem); position: relative; overflow: hidden; }
.hero-grid {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}
.eyebrow {
  display: inline-block;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .78rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--brand);
  padding: .35rem .7rem; border: 1px solid color-mix(in oklab, var(--brand) 40%, transparent);
  border-radius: 999px; background: color-mix(in oklab, var(--brand) 10%, transparent);
  margin-bottom: 1rem;
}
h1 {
  font-size: var(--fs-h1); line-height: 1.05; margin: 0 0 1rem;
  font-weight: 800; letter-spacing: -.02em;
}
.grad {
  background: linear-gradient(100deg, var(--brand) 0%, var(--brand-2) 60%, var(--accent) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { font-size: 1.1rem; color: var(--muted); max-width: 56ch; }

.cta-row { display: flex; gap: .8rem; margin: 1.5rem 0 2rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .85rem 1.25rem; border-radius: 12px; font-weight: 600;
  font-size: .98rem; transition: transform .15s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary {
  color: #0a0f24;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: var(--shadow-1);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-2); color: #0a0f24; }
.btn-ghost {
  color: var(--text); border-color: var(--border); background: transparent;
}
.btn-ghost:hover { background: var(--surface); color: var(--text); }

.stats {
  display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 1rem;
  padding: 1rem 0 0; margin: 1rem 0 .5rem;
  border-top: 1px solid var(--border);
}
.stats div { display: flex; flex-direction: column; }
.stats dt { color: var(--muted-2); font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; }
.stats dd { margin: .25rem 0 0; font-weight: 700; font-size: 1.2rem; color: var(--text); font-family: 'JetBrains Mono', monospace; }
.disclaimer { font-size: .8rem; color: var(--muted-2); margin-top: .25rem; }

/* Hero visual */
.hero-visual { position: relative; min-height: 380px; }
.orb {
  position: absolute; border-radius: 50%; filter: blur(40px); opacity: .7;
  pointer-events: none; z-index: 0;
}
.orb-1 { width: 340px; height: 340px; background: radial-gradient(circle, var(--brand), transparent 60%); top: -40px; right: -40px; }
.orb-2 { width: 300px; height: 300px; background: radial-gradient(circle, var(--brand-2), transparent 60%); bottom: -30px; left: -20px; }
.card-float {
  position: relative; z-index: 1;
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 1.2rem 1.2rem 1rem; max-width: 360px; margin: 0 auto;
  box-shadow: var(--shadow-2);
  animation: floaty 8s ease-in-out infinite;
}
@keyframes floaty {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.cf-row {
  display: flex; justify-content: space-between; padding: .55rem 0;
  border-bottom: 1px dashed var(--border);
  font-family: 'JetBrains Mono', monospace; font-size: .92rem;
  color: var(--muted);
}
.cf-row:last-of-type { border-bottom: 0; }
.cf-row .up { color: var(--accent); }
.cf-bar {
  margin-top: .7rem; height: 8px; background: var(--bg-2); border-radius: 999px; overflow: hidden;
  border: 1px solid var(--border);
}
.cf-bar span {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
}
.cf-footer { font-size: .78rem; color: var(--muted-2); margin-top: .4rem; font-family: 'JetBrains Mono', monospace; }

/* ============ Sections ============ */
.section { padding: clamp(3rem, 5vw, 5.5rem) 0; position: relative; }
.section-alt {
  background: linear-gradient(180deg, transparent, color-mix(in oklab, var(--surface) 40%, transparent));
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.section-head { max-width: 760px; margin: 0 auto 2.4rem; text-align: center; }
.section-head h2 {
  font-size: var(--fs-h2); margin: 0 0 .6rem;
  letter-spacing: -.01em; font-weight: 800;
}
.section-head p { color: var(--muted); margin: 0; font-size: 1.05rem; }

.prose { max-width: 70ch; margin: 0 auto 2.4rem; color: var(--muted); font-size: 1.02rem; }
.prose strong { color: var(--text); }
.prose em { color: var(--brand); font-style: normal; }

/* Pillars */
.pillars {
  display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 1rem; margin-top: 1rem;
}
.pillar {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.2rem;
  transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.pillar:hover { transform: translateY(-3px); border-color: color-mix(in oklab, var(--brand) 50%, var(--border)); }
.pillar-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: color-mix(in oklab, var(--brand) 14%, transparent);
  color: var(--brand);
  display: grid; place-items: center; margin-bottom: .8rem;
  border: 1px solid color-mix(in oklab, var(--brand) 30%, transparent);
}
.pillar h3 { margin: 0 0 .3rem; font-size: var(--fs-h3); }
.pillar p { margin: 0; color: var(--muted); font-size: .95rem; }

/* Primitives */
.primitives-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 1rem;
}
.prim {
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem; transition: transform .2s var(--ease), border-color .2s var(--ease);
  position: relative; overflow: hidden;
}
.prim::before {
  content: ""; position: absolute; inset: 0; opacity: 0;
  background: radial-gradient(400px 200px at var(--mx,50%) var(--my,-20%),
              color-mix(in oklab, var(--brand) 25%, transparent), transparent 70%);
  transition: opacity .25s var(--ease); pointer-events: none;
}
.prim:hover { transform: translateY(-3px); border-color: color-mix(in oklab, var(--brand) 40%, var(--border)); }
.prim:hover::before { opacity: 1; }
.prim h3 {
  margin: 0 0 .4rem; font-size: 1.1rem;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.prim p { margin: 0 0 .8rem; color: var(--muted); font-size: .97rem; }
.prim code {
  font-family: 'JetBrains Mono', monospace; font-size: .78rem;
  color: var(--muted-2); background: var(--bg-2);
  padding: .35rem .55rem; border-radius: 8px;
  border: 1px solid var(--border); display: inline-block;
}

/* Steps */
.steps {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 1rem;
  counter-reset: step;
}
.steps li {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.2rem; position: relative;
}
.step-num {
  font-family: 'JetBrains Mono', monospace; font-size: .78rem;
  color: var(--brand); letter-spacing: .1em; font-weight: 600;
}
.steps h3 { font-size: 1.02rem; margin: .35rem 0 .3rem; }
.steps p { margin: 0; color: var(--muted); font-size: .92rem; }
.mono { font-family: 'JetBrains Mono', monospace; color: var(--accent); }

/* Protocols table */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.protocols {
  width: 100%; border-collapse: collapse; min-width: 720px;
}
.protocols th, .protocols td {
  text-align: left; padding: .95rem 1rem; border-bottom: 1px solid var(--border);
  font-size: .95rem;
}
.protocols thead th {
  font-size: .78rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--muted-2); background: var(--surface-2); font-weight: 600;
}
.protocols tbody tr:hover { background: color-mix(in oklab, var(--brand) 6%, transparent); }
.protocols tbody tr:last-child td { border-bottom: 0; }
.protocols td:first-child { font-weight: 600; }
.note { text-align: center; color: var(--muted-2); font-size: .86rem; margin-top: 1rem; }

/* Risks */
.risks-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1rem;
}
.risk {
  background: var(--surface); border: 1px solid var(--border);
  border-left: 3px solid var(--danger);
  border-radius: var(--radius); padding: 1.2rem;
  transition: transform .2s var(--ease);
}
.risk:hover { transform: translateY(-3px); }
.risk h3 { margin: 0 0 .4rem; color: var(--text); font-size: 1.05rem; }
.risk p { margin: 0; color: var(--muted); font-size: .95rem; }

/* Glossary */
.glossary {
  display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 1rem 2rem;
  margin: 0;
}
.glossary > div {
  padding: 1rem 1.1rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.glossary dt {
  font-weight: 700; color: var(--brand); font-family: 'JetBrains Mono', monospace;
  font-size: .92rem; margin-bottom: .2rem;
}
.glossary dd { margin: 0; color: var(--muted); font-size: .95rem; }

/* Resources */
.resources {
  display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1rem;
}
.resource {
  display: block; padding: 1.2rem; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text);
  transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.resource:hover {
  transform: translateY(-3px); color: var(--text);
  border-color: color-mix(in oklab, var(--brand) 50%, var(--border));
}
.resource h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.resource p { margin: 0; color: var(--muted); font-size: .92rem; }

.callout {
  margin-top: 2rem;
  background: linear-gradient(135deg, color-mix(in oklab, var(--brand) 10%, transparent), color-mix(in oklab, var(--brand-2) 10%, transparent));
  border: 1px solid color-mix(in oklab, var(--brand) 30%, var(--border));
  border-radius: var(--radius-lg); padding: 1.4rem 1.6rem;
}
.callout h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.callout p { margin: 0; color: var(--muted); }

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, color-mix(in oklab, var(--surface) 40%, transparent));
  padding: 3rem 0 1.5rem; margin-top: 2rem;
}
.footer-grid {
  display: grid; grid-template-columns: 1.2fr 1fr 1.2fr; gap: 2rem; padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}
.brand-footer { margin-bottom: .6rem; }
.site-footer h4 { margin: 0 0 .5rem; font-size: .85rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted-2); }
.site-footer nav { display: flex; flex-direction: column; gap: .3rem; }
.site-footer nav a { color: var(--muted); font-size: .95rem; }
.site-footer nav a:hover { color: var(--text); }
.muted { color: var(--muted); font-size: .92rem; }

.footer-bottom {
  padding-top: 1.2rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  color: var(--muted-2); font-size: .85rem;
}
.back-top { color: var(--muted); }

/* ============ Reveal on scroll ============ */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .pillars, .primitives-grid, .resources, .risks-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .stats { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .nav-links { display: none; position: absolute; inset: 68px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--bg-2); border-bottom: 1px solid var(--border); padding: .5rem 1rem 1rem; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .8rem 0; border-bottom: 1px solid var(--border); width: 100%; }
  .nav-toggle { display: inline-flex; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; min-height: 240px; }
  .pillars, .primitives-grid, .resources, .risks-grid, .steps, .glossary { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .card-float { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}