/* ==========================================================
   ProLi — tokens
   ========================================================== */
:root{
  --ink: #0B1330;
  --ink-soft: #5B6478;
  --blue: #1B3F91;
  --blue-deep: #12296B;
  --blue-bright: #4C7CF2;
  --blue-tint: #EEF2FC;
  --border: #E4E8F2;
  --bg: #FAFBFE;
  --white: #FFFFFF;
  --surface: #FFFFFF;
  --nav-bg: rgba(250, 251, 254, 0.78);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 10px rgba(18, 41, 107, 0.06);
  --shadow-md: 0 12px 32px rgba(18, 41, 107, 0.10);
  --shadow-lg: 0 24px 60px rgba(18, 41, 107, 0.16);
  --ease: cubic-bezier(.22,1,.36,1);
  --cta-from: #1B3F91;
  --cta-to: #12296B;
}

[data-theme="dark"]{
  --ink: #EEF1FA;
  --ink-soft: #9AA3C0;
  --blue: #6690FF;
  --blue-deep: #8FADFF;
  --blue-bright: #6690FF;
  --blue-tint: rgba(102, 144, 255, 0.14);
  --border: #262C48;
  --bg: #0A0E1B;
  --surface: #131832;
  --nav-bg: rgba(10, 14, 27, 0.72);
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.36);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.46);
}

body{
  transition: background-color 0.35s var(--ease), color 0.35s var(--ease);
}

*, *::before, *::after{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body{
  margin: 0;
  font-family: 'Ubuntu', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

h1, h2, h3{
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p{ margin: 0 0 1em; color: var(--ink-soft); }

a{ color: inherit; }

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

.container{
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link{
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--blue);
  color: var(--white);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  z-index: 999;
}
.skip-link:focus{ left: 16px; top: 16px; }

:focus-visible{
  outline: 2px solid var(--blue-bright);
  outline-offset: 3px;
}

.eyebrow{
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--blue);
  margin: 0 0 0.75em;
}

/* ==========================================================
   Buttons
   ========================================================== */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.98rem;
  text-decoration: none;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
  white-space: nowrap;
}
.btn-primary{
  background: var(--blue);
  color: var(--white);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.btn-primary::before{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.28) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.7s var(--ease);
  z-index: 1;
}
.btn-primary:hover::before{ transform: translateX(120%); }
.btn-primary:hover{
  background: var(--blue-deep);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-secondary{
  background: var(--surface);
  color: var(--blue);
  border: 1px solid var(--border);
}
.btn-secondary:hover{
  border-color: var(--blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.btn-sm{ padding: 9px 18px; font-size: 0.9rem; }

/* ==========================================================
   Nav
   ========================================================== */
.nav{
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner{
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand{
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.brand-name{
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}
.nav-actions{
  display: flex;
  align-items: center;
  gap: 14px;
}
.theme-toggle{
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
  padding: 0;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease);
}
.theme-toggle:hover{
  color: var(--blue);
  border-color: var(--blue);
  transform: translateY(-1px);
}
.theme-toggle svg{ width: 18px; height: 18px; }
.theme-toggle .icon-moon{ display: none; }
[data-theme="dark"] .theme-toggle .icon-sun{ display: none; }
[data-theme="dark"] .theme-toggle .icon-moon{ display: block; }

/* ==========================================================
   Hero
   ========================================================== */
.hero{
  overflow: clip;
}
.hero-inner{
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 152px 24px 88px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.hero-copy h1{
  font-size: clamp(2.4rem, 4.4vw, 3.6rem);
  color: var(--ink);
}
.hero-sub{
  font-size: 1.08rem;
  max-width: 540px;
}
.hero-actions{
  display: flex;
  gap: 14px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.hero-actions.center{ justify-content: center; }

.hero-visual{
  position: relative;
  height: 420px;
}
.chain-lines{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.35;
}
.chain-path{
  fill: none;
  stroke: var(--blue-bright);
  stroke-width: 1.6;
  stroke-dasharray: 4 8;
  stroke-linecap: round;
  animation: chain-flow 6s linear infinite;
}
@keyframes chain-flow{
  to{ stroke-dashoffset: -48; }
}
.chain-node{ fill: var(--blue); }

.id-card{
  position: absolute;
  top: 46px;
  left: 30px;
  width: 300px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 22px;
}
.id-card-top{
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.id-icon{
  font-size: 1.6rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-tint);
  border-radius: var(--radius-sm);
}
.id-card-title{ margin: 0; font-weight: 700; color: var(--ink); font-size: 0.98rem; }
.id-card-sub{ margin: 2px 0 0; font-size: 0.8rem; color: var(--ink-soft); }
.id-card-row{
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--ink);
  padding: 7px 0;
}
.dot{ width: 8px; height: 8px; border-radius: 50%; flex: none; }
.dot-live{
  background: var(--blue-bright);
  box-shadow: 0 0 0 4px var(--blue-tint);
  animation: dot-pulse 2.4s ease-in-out infinite;
}

@keyframes dot-pulse{
  0%, 100%{ box-shadow: 0 0 0 4px var(--blue-tint); }
  50%{ box-shadow: 0 0 0 7px var(--blue-tint); }
}

.chip{
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--blue);
  box-shadow: var(--shadow-md);
}
.chip-a{ top: 20px; right: 10px; }
.chip-b{ bottom: 62px; left: 6px; }

.float-1{ animation: float-a 7s ease-in-out infinite; }
.float-2{ animation: float-b 6s ease-in-out infinite; }
.float-3{ animation: float-c 8s ease-in-out infinite; }

@keyframes float-a{
  0%, 100%{ transform: translateY(0); }
  50%{ transform: translateY(-12px); }
}
@keyframes float-b{
  0%, 100%{ transform: translateY(0); }
  50%{ transform: translateY(10px); }
}
@keyframes float-c{
  0%, 100%{ transform: translateY(0); }
  50%{ transform: translateY(-8px); }
}

/* ==========================================================
   Sections
   ========================================================== */
.section{ padding: 88px 0; }
.section-tight{ padding: 0 0 24px; }
.section-alt{ background: var(--blue-tint); }
.section-head{
  max-width: 620px;
  margin: 0 0 48px;
}
.section-head h2{ font-size: clamp(1.7rem, 3vw, 2.2rem); }

/* Banner */
.banner{
  display: flex;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--blue);
  border-radius: var(--radius-md);
  padding: 26px 28px;
  box-shadow: var(--shadow-sm);
}
.banner-icon{
  font-size: 1.4rem;
  color: var(--blue);
  flex: none;
}
.banner-title{ font-weight: 700; color: var(--ink); margin: 0 0 6px; }
.banner-text{ margin: 0; }

/* Feature grid */
.grid{ display: grid; gap: 22px; }
.grid-4{ grid-template-columns: repeat(4, 1fr); }

.card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}
.card:hover{
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.card-icon{
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  background: var(--blue-tint);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.card-icon svg{ width: 22px; height: 22px; }
.card h3{ font-size: 1.05rem; margin-bottom: 0.4em; }
.card p{ font-size: 0.94rem; margin: 0; }

/* How it works */
.steps{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.step{ flex: 1 1 220px; max-width: 260px; }
.step-fade{ transition-timing-function: var(--ease); }
.step-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}
.step-card:hover{ transform: translateY(-6px); box-shadow: var(--shadow-md); }
.step-icon{ font-size: 1.8rem; display: block; margin-bottom: 14px; }
.step-card h3{ font-size: 1rem; margin: 0; }
.step-arrow{
  color: var(--blue);
  flex: none;
  opacity: 0.6;
}
.step-arrow svg{ width: 22px; height: 22px; }

/* Collaboration */
.collab{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.collab-solo{
  grid-template-columns: 1fr;
  text-align: center;
}
.collab-solo .collab-copy{
  max-width: 620px;
  margin: 0 auto;
}
.collab-copy h2{ font-size: clamp(1.8rem, 3.2vw, 2.4rem); }

/* Final CTA */
.section-cta{
  background: linear-gradient(135deg, var(--cta-from) 0%, var(--cta-to) 100%);
  border-radius: var(--radius-lg);
  margin: 0 24px 88px;
  padding: 72px 24px;
}
.cta-block{ max-width: 640px; margin: 0 auto; text-align: center; }
.cta-block h2{ color: var(--white); font-size: clamp(1.8rem, 3.4vw, 2.4rem); }
.section-cta .btn-secondary{
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.35);
}
.section-cta .btn-secondary:hover{
  border-color: var(--white);
  box-shadow: none;
}
.section-cta .btn-primary{
  background: var(--white);
  color: var(--cta-from);
}
.section-cta .btn-primary:hover{
  color: var(--cta-to);
}

/* ==========================================================
   Footer
   ========================================================== */
.footer{
  border-top: 1px solid var(--border);
  padding: 40px 0;
}
.footer-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-brand{
  display: flex;
  align-items: center;
  gap: 12px;
}
.footer-name{ font-weight: 700; margin: 0; }
.footer-tagline{ margin: 2px 0 0; font-size: 0.85rem; color: var(--ink-soft); }
.footer-meta{ text-align: right; font-size: 0.86rem; color: var(--ink-soft); }
.footer-meta a{ text-decoration: none; color: var(--blue); }
.footer-meta p{ margin: 4px 0 0; }

/* ==========================================================
   Scroll fade-in
   ========================================================== */
.fade-in{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.fade-in.is-visible{
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 880px){
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-visual{ height: 340px; order: -1; }
  .grid-4{ grid-template-columns: repeat(2, 1fr); }
  .collab{ grid-template-columns: 1fr; gap: 32px; }
  .steps{ flex-direction: column; }
  .step-arrow{ transform: rotate(90deg); }
  .footer-inner{ text-align: center; justify-content: center; }
  .footer-meta{ text-align: center; }
}

@media (max-width: 520px){
  .hero{ padding-top: 132px; }
  .grid-4{ grid-template-columns: 1fr; }
  .nav-inner{ padding: 12px 18px; }
  .section-cta{ margin: 0 16px 64px; }
  .id-card{ width: calc(100% - 60px); }
}