/* REVELFLOW — Premium Dark Product UI (Vercel × Superhuman × Perplexity)
   Typography-first • glass/blur • one accent • minimal borders/cards • subtle motion
*/

/* Reset */
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
img,svg{display:block;max-width:100%}
button,input{font:inherit}
a{color:inherit;text-decoration:none}

/* Tokens */
:root{
  /* Typography */
  --font-ui: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --font-display: Manrope, Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;

  /* Dark (default) */
  --bg:#0B0D10;
  --bg-soft:#0F1217;
  --surface:#121723;

  --text:#F5F7FA;
  --muted:#9AA4B2;
  --muted-2:#6B7380;

  --border: rgba(255,255,255,0.08);
  --border-2: rgba(255,255,255,0.12);

  /* Single accent */
  --accent:#3B82F6;
  --accent-soft: rgba(59,130,246,0.15);
  --accent-glow: rgba(59,130,246,0.35);

  /* Ambient (not UI) */
  --ambient-violet: rgba(168,85,247,0.12);

  /* Radius */
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 20px;

  /* Layout */
  --container: 1180px;
  --pad: 28px;

  /* Motion */
  --ease: cubic-bezier(.2,.8,.2,1);
  --t-fast: 200ms;
  --t: 250ms;
  --t-slow: 350ms;
}

/* Light theme (optional) */
html[data-theme="light"]{
  --bg:#F7F8FB;
  --bg-soft:#FFFFFF;
  --surface:#F1F4FA;

  --text:#0B0D10;
  --muted:#4B5563;
  --muted-2:#6B7280;

  --border: rgba(15,23,42,0.10);
  --border-2: rgba(15,23,42,0.14);

  --accent-soft: rgba(59,130,246,0.12);
  --accent-glow: rgba(59,130,246,0.22);

  --ambient-violet: rgba(168,85,247,0.09);
}

/* Base */
body{
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x:hidden;
}
::selection{background: var(--accent-soft);}

/* Helpers */
.container{
  width:100%;
  max-width: var(--container);
  margin:0 auto;
  padding: 0 var(--pad);
}
.muted{color:var(--muted)}
.kicker{
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.h1,.h2,.h3{
  font-family: var(--font-display);
  letter-spacing: -0.04em;
}
.h1{
  font-size: clamp(44px, 5vw, 72px);
  line-height: 1.04;
}
.h2{
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.12;
}
.h3{
  font-size: 18px;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.lead{
  margin-top: 18px;
  font-size: 18px;
  color: var(--muted);
  max-width: 58ch;
}
.sub{
  margin-top: 14px;
  color: var(--muted);
  max-width: 70ch;
}
.p{color: var(--muted); margin-top: 10px}

/* Ambient background */
.bg-ambient{
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}
.bg-blob{
  position:absolute;
  width: 760px;
  height: 760px;
  filter: blur(40px);
  border-radius: 999px;
  opacity: .9;
  transform: translate3d(0,0,0);
}
.blob-1{
  left: -280px;
  top: -320px;
  background: radial-gradient(circle at 30% 30%, rgba(59,130,246,.16), transparent 60%);
}
.blob-2{
  right: -320px;
  bottom: -360px;
  background: radial-gradient(circle at 30% 30%, var(--ambient-violet), transparent 60%);
}
.bg-grid{
  position:absolute;
  inset: -2px;
  background:
    radial-gradient(800px 420px at 50% 0%, rgba(255,255,255,0.06), transparent 60%),
    linear-gradient(to right, rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: auto, 64px 64px, 64px 64px;
  opacity: .16;
  mask-image: radial-gradient(70% 50% at 50% 18%, #000 55%, transparent 100%);
}

/* Navigation */
.nav{
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(12px);
}
html[data-theme="light"] .nav{
  background: color-mix(in srgb, var(--bg-soft) 88%, transparent);
}
.nav-inner{
  height: 68px;
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 16px;
}

.brand{
  display:flex;
  align-items:center;
  gap: 12px;
  user-select:none;
}
.mark{
  width: 14px;
  height: 14px;
  border-radius: 6px;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft), 0 0 24px var(--accent-glow);
}
.brand-text{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .12em;
}

.nav-links{
  display:flex;
  align-items:center;
  gap: 18px;
}
.nav-links a{
  color: var(--muted);
  font-size: 13px;
  letter-spacing: .02em;
  padding: 10px 10px;
  border-radius: 12px;
  transition: color var(--t) var(--ease), background var(--t) var(--ease);
}
.nav-links a:hover{
  color: var(--text);
  background: rgba(255,255,255,0.04);
}
.nav-actions{
  display:flex;
  align-items:center;
  gap: 10px;
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  cursor:pointer;
  transition: transform var(--t) var(--ease), background var(--t) var(--ease), border-color var(--t) var(--ease), color var(--t) var(--ease), box-shadow var(--t) var(--ease);
  font-weight: 500;
  letter-spacing: .01em;
}
.btn:active{transform: translateY(1px)}
.btn-sm{padding: 10px 14px; border-radius: 12px; font-size: 13px}

.btn-primary{
  background: var(--accent);
  /* Force crisp white label everywhere (even for nested spans/icons) */
  color: #fff;
  opacity: 1;
  filter: none;
  -webkit-text-fill-color: #fff; /* helps on some Safari cases */
  box-shadow: 0 0 0 6px var(--accent-soft), 0 12px 30px rgba(0,0,0,0.40);
}
.btn-primary *{
  color: #fff;
  -webkit-text-fill-color: #fff;
}
.btn-primary:hover{
  /* Explicitly restate background so it can't be overridden in light theme */
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 0 8px var(--accent-soft), 0 16px 40px rgba(0,0,0,0.48);
}

/* Light theme tuning: keep CTA vivid but reduce heavy dark shadow */
html[data-theme="light"] .btn-primary{
  box-shadow: 0 0 0 6px var(--accent-soft), 0 10px 24px rgba(2,6,23,0.16);
}
html[data-theme="light"] .btn-primary:hover{
  background: var(--accent);
  box-shadow: 0 0 0 8px var(--accent-soft), 0 14px 32px rgba(2,6,23,0.20);
}

.btn-secondary{
  background: rgba(255,255,255,0.04);
  border-color: var(--border);
  color: var(--text);
}
.btn-secondary:hover{
  background: rgba(255,255,255,0.06);
  border-color: var(--border-2);
}

.btn-ghost{
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}
.btn-ghost:hover{
  color: var(--text);
  background: rgba(255,255,255,0.04);
}

.btn-icon{
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 14px;
}

/* Minimal icons (no icon fonts) */
.icon-sun, .icon-x, .burger{
  width: 16px; height: 16px; display:inline-block; position:relative;
}

/* Sun/Moon toggle: draw a simple "spark" dot */
.icon-sun::before{
  content:"";
  position:absolute; inset: 0;
  border-radius: 999px;
  border: 2px solid currentColor;
  opacity: .9;
}
html[data-theme="dark"] .icon-sun::after{
  content:"";
  position:absolute;
  width: 9px; height: 9px;
  right: -2px; top: -2px;
  border-radius: 999px;
  background: var(--bg);
  border: 2px solid var(--bg);
}
html[data-theme="light"] .icon-sun::after{content:none}

/* X icon */
.icon-x::before,.icon-x::after{
  content:"";
  position:absolute; left: 50%; top: 50%;
  width: 18px; height: 2px;
  background: currentColor;
  transform-origin:center;
}
.icon-x::before{transform: translate(-50%,-50%) rotate(45deg)}
.icon-x::after{transform: translate(-50%,-50%) rotate(-45deg)}

/* Burger icon */
.burger::before,.burger::after{
  content:"";
  position:absolute; left: 0; right: 0;
  height: 2px; background: currentColor;
  border-radius: 99px;
}
.burger::before{top: 4px}
.burger::after{bottom: 4px}
.burger{opacity:.9}

/* Mobile drawer */
.nav-burger{display:none}
.nav-drawer{
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events:none;
  transition: opacity var(--t) var(--ease);
}
.nav-drawer.is-open{
  opacity: 1;
  pointer-events:auto;
}
.drawer-panel{
  position:absolute;
  right: 16px;
  top: 16px;
  width: min(420px, calc(100% - 32px));
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--bg-soft) 86%, transparent);
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  overflow:hidden;
  transform: translateY(-8px);
  transition: transform var(--t) var(--ease);
}
.nav-drawer.is-open .drawer-panel{transform: translateY(0)}
.drawer-top{
  padding: 16px 16px 10px;
  display:flex;
  align-items:center;
  justify-content: space-between;
}
.drawer-title{
  font-family: var(--font-display);
  letter-spacing: -.02em;
}
.drawer-links{
  display:flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 16px 16px;
}
.drawer-links a{
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid transparent;
  color: var(--text);
  background: rgba(255,255,255,0.02);
}
.drawer-links a:hover{
  border-color: var(--border);
  background: rgba(255,255,255,0.04);
}
.drawer-footer{
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

/* Sections */
.section{padding: 110px 0}
.section-soft{
  background: color-mix(in srgb, var(--bg-soft) 82%, transparent);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-head{
  max-width: 820px;
  margin: 0 auto 54px;
  text-align: center;
}

/* Hero */
.hero{
  padding: 92px 0 90px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 54px;
  align-items: start;
}
.pill{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--muted);
  font-size: 13px;
}
.dot{
  width: 8px; height: 8px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft), 0 0 18px var(--accent-glow);
}
.grad{
  color: var(--text);
  position: relative;
}
.grad::after{
  content:"";
  position:absolute;
  left: -2px; right: -2px;
  bottom: .08em;
  height: .55em;
  border-radius: 999px;
  background: var(--accent-soft);
  filter: blur(0px);
  z-index: -1;
}

.hero-cta{
  display:flex;
  gap: 14px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.hero-metrics{
  display:flex;
  gap: 26px;
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}
.metric-value{
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: -0.02em;
}
.metric-label{
  color: var(--muted-2);
  font-size: 12px;
  margin-top: 4px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* Hero panel (glassy preview) */
.hero-panel{position: relative}
.panel-card{
  position: relative;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  backdrop-filter: blur(14px);
  overflow: hidden;
}
.panel-top{
  padding: 16px 18px;
  display:flex;
  justify-content: space-between;
  align-items:center;
  border-bottom: 1px solid var(--border);
}
.panel-chip{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.chip-dot{
  width: 7px; height: 7px;
  border-radius: 99px;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
}
.panel-status{
  color: var(--muted);
  font-size: 12px;
}
.panel-body{padding: 18px}
.prompt-label{
  color: var(--muted-2);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.prompt-box{
  margin-top: 10px;
  padding: 14px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  display:flex;
  gap: 10px;
  align-items: flex-start;
}
.prompt-caret{
  width: 10px; height: 10px;
  margin-top: 6px;
  border-radius: 3px;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
  flex: 0 0 auto;
}
.prompt-text{
  color: var(--text);
  font-size: 14px;
  line-height: 1.55;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
}
.prompt-text.is-out{opacity:0; transform: translateY(6px)}
.prompt-text.is-in{opacity:1; transform: translateY(0)}

.panel-results{
  margin-top: 16px;
  display:grid;
  gap: 10px;
}
.result{
  padding: 12px 12px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.result-title{
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: -0.01em;
}
.result-line{
  margin-top: 10px;
  height: 1px;
  background: linear-gradient(to right, var(--border), rgba(255,255,255,0.02));
}
.result-meta{
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
}
.panel-glow{
  position:absolute;
  inset: -30%;
  background: radial-gradient(closest-side, var(--accent-glow), transparent 55%);
  opacity: .28;
  pointer-events:none;
}

/* Cards (minimal) */
.cards{
  display:grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 18px;
}
.cards-3{grid-template-columns: repeat(3, minmax(0,1fr))}
.card{
  padding: 22px 22px 20px;
  border-radius: var(--r-lg);
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.card:hover{
  transform: translateY(-3px);
  border-color: var(--border-2);
  background: rgba(255,255,255,0.03);
}
.tags{display:flex; gap: 10px; flex-wrap: wrap; margin-top: 14px}
.tag{
  font-size: 12px;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}

/* Split + feature stack */
.split{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
  align-items: start;
}
.stack{display:grid; gap: 12px}
.feature{
  padding: 18px 18px;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.feature-title{
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}
.feature-text{
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

/* Viz */
.viz-card{
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  backdrop-filter: blur(12px);
  padding: 18px;
}
.viz-row{display:flex; gap: 10px; flex-wrap: wrap}
.viz-pill{
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  color: var(--muted);
  font-size: 12px;
}
.viz-graph{
  position: relative;
  height: 210px;
  margin-top: 16px;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background:
    radial-gradient(420px 240px at 20% 20%, rgba(59,130,246,0.12), transparent 60%),
    rgba(255,255,255,0.02);
  overflow:hidden;
}
.node{
  position:absolute;
  width: 12px; height: 12px;
  border-radius: 99px;
  background: var(--accent);
  box-shadow: 0 0 0 8px var(--accent-soft);
  opacity: .95;
}
.n1{left: 18%; top: 28%}
.n2{left: 52%; top: 46%}
.n3{left: 78%; top: 30%}
.edge{
  position:absolute;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border-2), transparent);
  opacity: .9;
}
.e1{left: 20%; top: 32%; width: 42%; transform: rotate(10deg)}
.e2{left: 55%; top: 46%; width: 30%; transform: rotate(-12deg)}
.viz-caption{margin-top: 12px; font-size: 13px}

/* Timeline */
.timeline{
  margin-top: 10px;
  display:grid;
  gap: 12px;
  max-width: 920px;
  margin-left:auto;
  margin-right:auto;
}
.step{
  display:flex;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: rgba(255,255,255,0.02);
}
.step-dot{
  width: 10px; height: 10px;
  margin-top: 8px;
  border-radius: 99px;
  background: var(--accent);
  box-shadow: 0 0 0 8px var(--accent-soft);
  flex: 0 0 auto;
}
.step-title{
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}
.step-text{color: var(--muted); font-size: 14px; margin-top: 6px}

/* Lists */
.list{
  margin-top: 16px;
  list-style:none;
  display:grid;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}
.list li{
  padding-left: 14px;
  position: relative;
}
.list li::before{
  content:"";
  position:absolute;
  left:0;
  top: .65em;
  width: 6px; height: 6px;
  border-radius: 99px;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
  opacity: .9;
}

/* CTA */
.cta{padding: 110px 0}
.cta-inner{max-width: var(--container)}
.cta-card{
  border-radius: 24px;
  border: 1px solid var(--border);
  background:
    radial-gradient(700px 420px at 15% 20%, rgba(59,130,246,0.14), transparent 58%),
    radial-gradient(700px 420px at 85% 80%, var(--ambient-violet), transparent 58%),
    color-mix(in srgb, var(--surface) 78%, transparent);
  backdrop-filter: blur(14px);
  padding: 34px;
}
.cta-actions{display:flex; gap: 14px; margin-top: 20px; flex-wrap: wrap}
.cta-badges{display:flex; gap: 10px; margin-top: 22px; flex-wrap: wrap}
.badge{
  font-size: 12px;
  color: var(--muted);
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}

/* Footer */
.footer{
  padding: 56px 0 26px;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-soft) 70%, transparent);
}
.footer-inner{
  display:flex;
  justify-content: space-between;
  gap: 36px;
  align-items:flex-start;
}
.brand-footer .mark{box-shadow:none}
.footer-right{
  display:flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content:flex-end;
}
.footer-right a{
  color: var(--muted);
  padding: 10px 10px;
  border-radius: 12px;
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
}
.footer-right a:hover{background: rgba(255,255,255,0.04); color: var(--text)}
.footer-bottom{
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  display:flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* Motion / reveal */
[data-animate]{
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
[data-animate].is-in{
  opacity: 1;
  transform: translateY(0);
}

/* Accessibility */
:focus-visible{
  outline: none;
  box-shadow: 0 0 0 4px var(--accent-soft);
  border-color: var(--border-2);
}

/* Responsive */
@media (max-width: 980px){
  .hero-grid{grid-template-columns: 1fr; gap: 26px}
  .hero{padding-top: 78px}
  .hero-metrics{gap: 18px; flex-wrap: wrap}
  .split{grid-template-columns: 1fr}
  .cards{grid-template-columns: 1fr}
  .cards-3{grid-template-columns: 1fr}
  .nav-links{display:none}
  .nav-burger{display:inline-flex}
}

@media (max-width: 520px){
  :root{--pad: 18px}
  .nav-inner{height: 64px}
  .btn-icon{width: 40px; height: 40px}
  .cta-card{padding: 22px}
}

.nav .btn-ghost{
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
}