/* ============================================================
   Overlink — design system
   ============================================================ */

:root {
  /* surfaces */
  --bg:            #F6F7FB;
  --bg-elev:       #FFFFFF;
  --surface:       rgba(15, 23, 42, 0.035);
  --surface-hover: rgba(15, 23, 42, 0.06);

  /* lines & borders */
  --border:        rgba(15, 23, 42, 0.10);
  --border-strong: rgba(15, 23, 42, 0.16);
  --line:          rgba(100, 116, 150, 0.35);
  --line-bright:   rgba(71, 89, 128, 0.75);

  /* text */
  --text:          #10172A;
  --text-soft:     #333B4D;
  --text-muted:    #5B6478;
  --text-faint:    #8891A3;

  /* brand */
  --accent:        #2563EB;
  --accent-2:      #0E7490;
  --accent-dim:    rgba(37, 99, 235, 0.5);
  --accent-glow:   rgba(37, 99, 235, 0.28);

  /* type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;

  /* spacing / shape */
  --wrap:   1200px;
  --radius: 3px;
  --radius-sm: 2px;

  --shadow-card: 0 1px 0 rgba(255,255,255,0.8) inset, 0 24px 60px -30px rgba(15,23,42,0.12);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- reset-ish ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.03em; line-height: 1.08; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; cursor: pointer; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 24px; }
.mono { font-family: var(--font-mono); font-weight: 500; }
.grad-text {
  background: linear-gradient(100deg, var(--accent-2), var(--accent) 55%, #123C82);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 50%; top: -60px; transform: translateX(-50%);
  background: var(--bg-elev); border: 1px solid var(--border-strong);
  padding: 10px 16px; border-radius: 3px; z-index: 100; transition: top .2s;
}
.skip-link:focus { top: 12px; }

/* ---------- shared corner ticks (drafting-style crosshairs) ---------- */
.corners { position: relative; border-radius: 0 !important; }
.corners::before, .corners::after {
  content: ""; position: absolute; width: 12px; height: 12px; pointer-events: none;
  background:
    linear-gradient(var(--border-strong), var(--border-strong)) center / 100% 1px no-repeat,
    linear-gradient(var(--border-strong), var(--border-strong)) center / 1px 100% no-repeat;
}
.corners::before { top: -6px; left: -6px; }
.corners::after  { bottom: -6px; right: -6px; }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  --btn-py: 13px; --btn-px: 22px;
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: var(--btn-py) var(--btn-px);
  border-radius: 3px; border: 1px solid var(--border-strong);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase;
  white-space: nowrap; transition: transform .15s var(--ease), background .18s, border-color .18s, color .18s, box-shadow .18s;
}
.btn:active { transform: translateY(1px); }
.btn-sm { --btn-py: 9px; --btn-px: 15px; font-size: 0.7rem; }
.btn.corners::before, .btn.corners::after { width: 8px; height: 8px; }
.btn.corners::before { top: -4px; left: -4px; }
.btn.corners::after { bottom: -4px; right: -4px; }

.btn-primary {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: rgba(37,99,235,0.06);
}
.btn-primary:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.16);
}
.btn-primary.corners::before, .btn-primary.corners::after {
  background:
    linear-gradient(var(--accent), var(--accent)) center / 100% 1px no-repeat,
    linear-gradient(var(--accent), var(--accent)) center / 1px 100% no-repeat;
}
.btn-secondary {
  color: var(--text-soft);
  background: var(--surface);
  border-color: var(--border-strong);
}
.btn-secondary:hover { background: var(--surface-hover); color: var(--text); border-color: var(--text-muted); }

:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; border-radius: 2px; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; }
.logo-mark { flex: none; }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-word { font-weight: 600; font-size: 1.05rem; letter-spacing: -0.02em; }
.logo-sub { font-size: 0.62rem; font-weight: 400; letter-spacing: 0.01em; color: var(--text-muted); opacity: 0.7; }
.header-nav { display: flex; align-items: center; gap: 24px; }
.nav-link { color: var(--text-muted); font-size: 0.9rem; transition: color .2s; }
.nav-link:hover { color: var(--text); }

/* ============================================================
   Hero
   ============================================================ */
.hero { position: relative; overflow: hidden; padding-top: 76px; }
.hero-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.hero-grid {
  position: absolute; inset: -1px;
  background-image:
    linear-gradient(to right, rgba(15,23,42,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15,23,42,0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 35%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 35%, transparent 78%);
}
.hero-vignette {
  position: absolute; inset: 0;
  background:
    radial-gradient(60% 42% at 50% 6%, rgba(37,99,235,0.14), transparent 70%),
    radial-gradient(50% 40% at 50% 74%, rgba(14,116,144,0.10), transparent 72%);
}
.hero-inner { position: relative; z-index: 1; text-align: center; padding-bottom: 40px; }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px 6px 12px; border-radius: 2px;
  background: var(--surface); border: 1px solid var(--border-strong);
  color: var(--text-soft); font-size: 0.8rem; font-weight: 500; letter-spacing: -0.005em;
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent-2);
  box-shadow: 0 0 0 0 rgba(14,116,144,0.5); animation: pulse-ring 2.4s ease-out infinite;
}
@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(14,116,144,0.4); }
  70%  { box-shadow: 0 0 0 7px rgba(14,116,144,0); }
  100% { box-shadow: 0 0 0 0 rgba(14,116,144,0); }
}

.hero-title {
  margin: 26px auto 0;
  max-width: 900px;
  font-size: clamp(2.4rem, 5.4vw, 4.1rem);
}
.hero-lede {
  margin: 22px auto 0; max-width: 60ch;
  color: var(--text-muted); font-size: clamp(1.02rem, 1.6vw, 1.2rem); line-height: 1.55;
}
.hero-meta { margin-top: 16px; color: var(--text-faint); font-size: 0.82rem; }

/* waitlist form */
.waitlist-form { position: relative; z-index: 2; margin: 30px auto 0; max-width: 460px; }
.field-row { display: flex; gap: 8px; }
.field-row input {
  flex: 1; min-width: 0;
  padding: 13px 16px; border-radius: 3px;
  background: #FFFFFF; border: 1px solid var(--border-strong);
  color: var(--text); font-size: 0.95rem; transition: border-color .2s, background .2s, box-shadow .2s;
}
.field-row input::placeholder { color: var(--text-faint); }
.field-row input:focus {
  outline: none; border-color: var(--accent-dim);
  background: rgba(37,99,235,0.04); box-shadow: 0 0 0 3px rgba(37,99,235,0.14);
}
.form-message { min-height: 20px; margin-top: 10px; font-size: 0.85rem; color: var(--text-muted); }
.form-message.error { color: #B3261E; }
.form-message.success { color: var(--accent-2); }

/* ---------- Hero figure (focal graphic) ---------- */
.hero-figure { position: relative; z-index: 1; margin: -120px auto 0; max-width: 1040px; }
.figure-frame {
  position: relative;
  padding: 0;
}
.stream-svg {
  width: 100%; height: auto;
  mask-image: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.5) 12%, #000 26%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.5) 12%, #000 26%);
}

.cyl-label { fill: var(--text-faint); font-size: 20px; letter-spacing: 0.04em; }

/* stream animation is applied to generated elements (see script.js) */
.packet { opacity: 0; filter: drop-shadow(0 0 3px rgba(126,231,255,0.9)); }
@keyframes packet-run {
  0%   { stroke-dashoffset: 100; opacity: 0; }
  6%   { opacity: 1; }
  88%  { opacity: 1; }
  100% { stroke-dashoffset: 0; opacity: 0; }
}
.mouth-glow { transform-origin: 600px 548px; animation: mouth-breathe 4s ease-in-out infinite; }
.cyl-top   { animation: rim-breathe 4s ease-in-out infinite; }
@keyframes mouth-breathe {
  0%, 100% { opacity: 0.75; transform: scale(0.96); }
  50%      { opacity: 1;    transform: scale(1.04); }
}
@keyframes rim-breathe {
  0%, 100% { filter: drop-shadow(0 0 3px rgba(126,231,255,0.3)); }
  50%      { filter: drop-shadow(0 0 9px rgba(126,231,255,0.55)); }
}

/* ============================================================
   Sections
   ============================================================ */
.section { position: relative; padding: clamp(80px, 12vw, 140px) 0; }
.section-head { max-width: 620px; margin: 0 auto clamp(48px, 6vw, 72px); text-align: center; }
.eyebrow {
  display: inline-block; color: var(--accent-2); font-size: 0.78rem;
  text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 16px;
}
.section-title { font-size: clamp(1.9rem, 3.6vw, 2.9rem); }
.section-sub { margin-top: 16px; color: var(--text-muted); font-size: 1.06rem; }

/* value prop */
.how {
  position: relative;
}
.how::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: min(1040px, 88%); height: 1px;
  background: linear-gradient(to right, transparent, var(--border) 20%, var(--border) 80%, transparent);
}
.card-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.feature-card {
  display: flex; flex-direction: column;
  padding: 28px;
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .3s, transform .3s var(--ease), box-shadow .3s;
}
.feature-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: 0 30px 60px -40px rgba(37,99,235,0.25);
}
.card-visual {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background:
    radial-gradient(80% 80% at 50% 100%, rgba(37,99,235,0.06), transparent 70%),
    linear-gradient(180deg, rgba(15,23,42,0.02), transparent);
  padding: 20px; margin-bottom: 24px;
}
.card-svg { width: 100%; height: auto; }
.card-index {
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent);
}
.card-title { margin-top: 12px; font-size: 1.4rem; }
.card-body { margin-top: 12px; color: var(--text-muted); font-size: 0.98rem; }
.card-list { margin-top: 20px; display: grid; gap: 10px; }
.card-list li {
  position: relative; padding-left: 24px; color: var(--text-soft); font-size: 0.92rem;
}
.card-list li::before {
  content: ""; position: absolute; left: 4px; top: 8px;
  width: 8px; height: 8px; border-radius: 2px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  box-shadow: 0 0 8px rgba(37,99,235,0.4);
}

/* SVG detail animations inside cards */
.dash-flow { stroke-dasharray: 5 8; animation: dash-move 1.6s linear infinite; }
@keyframes dash-move { to { stroke-dashoffset: -26; } }
.pulse-node { transform-box: fill-box; transform-origin: center; animation: node-pulse 1.9s ease-in-out infinite; }
@keyframes node-pulse { 0%,100% { opacity: 0.55; } 50% { opacity: 1; } }

.web-edge { stroke: var(--line); stroke-width: 1; transition: stroke 0.9s ease, stroke-width 0.9s ease; }
.web-edge.lit { stroke: url(#edgeGlow); stroke-width: 1.6; }
.web-node { fill: var(--line-bright); transition: fill 0.9s ease, filter 0.9s ease; }
.web-node.lit { fill: var(--accent); filter: drop-shadow(0 0 4px var(--accent-glow)); }

/* Wireframe globe: static latitude rings + outline, meridians spin via
   scaleX/opacity keyframes so each one sweeps from a thin center line
   out to the limb and back, faking rotation without any JS. */
.globe-outline { fill: none; stroke: var(--line-bright); stroke-width: 1; }
.globe-lat { fill: none; stroke: var(--line); stroke-width: 0.7; }
.globe-equator { stroke: var(--line-bright); stroke-width: 0.9; }
.meridian {
  fill: none; stroke: var(--accent); stroke-width: 1;
  transform-box: fill-box; transform-origin: center;
  animation: globe-spin 14s linear infinite;
}
.m1 { animation-delay: 0s; }
.m2 { animation-delay: -2.333s; }
.m3 { animation-delay: -4.666s; }
.m4 { animation-delay: -7s; }
.m5 { animation-delay: -9.333s; }
.m6 { animation-delay: -11.666s; }
@keyframes globe-spin {
  0%   { transform: scaleX(0.01); opacity: 0.9; }
  50%  { transform: scaleX(1);    opacity: 0.12; }
  100% { transform: scaleX(0.01); opacity: 0.9; }
}
.globe-node { transform-box: fill-box; transform-origin: center; }

/* ============================================================
   Pricing
   ============================================================ */
.pricing { position: relative; }
.pricing::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: min(1040px, 88%); height: 1px;
  background: linear-gradient(to right, transparent, var(--border) 20%, var(--border) 80%, transparent);
}
.price-card {
  position: relative;
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
  padding: clamp(32px, 5vw, 44px);
  max-width: 400px; margin: 0 auto;
  background:
    radial-gradient(80% 120% at 50% 0%, rgba(37,99,235,0.08), transparent 65%),
    linear-gradient(180deg, #FFFFFF, #FFFFFF);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  transition: border-color .3s, transform .3s var(--ease), box-shadow .3s;
}
.price-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 30px 60px -40px rgba(37,99,235,0.25);
}
.price-badge { margin-bottom: 24px; }

.price-figure { display: flex; align-items: baseline; justify-content: center; gap: 10px; margin-top: 4px; }
.price-amount { font-size: 2.6rem; font-weight: 600; letter-spacing: -0.02em; color: var(--text); }
.price-amount-was {
  position: relative;
  font-size: 1.6rem; font-weight: 500; color: var(--text-faint);
}
.price-amount-was::after {
  content: ""; position: absolute; top: -8%; bottom: -8%; left: 50%;
  width: 1.5px; background: var(--text-faint);
  transform: rotate(20deg);
}
.price-period { font-size: 0.95rem; color: var(--text-muted); }
.price-detail { margin-top: 10px; color: var(--text-muted); font-size: 0.9rem; }
.price-cta { margin-top: 32px; min-width: 260px; }

/* ============================================================
   Final CTA
   ============================================================ */
.cta-band { position: relative; }
.cta-band::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: min(1040px, 88%); height: 1px;
  background: linear-gradient(to right, transparent, var(--border) 20%, var(--border) 80%, transparent);
}
.cta-inner {
  position: relative; text-align: center;
  max-width: 760px;
  padding: clamp(48px, 6vw, 72px) 32px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background:
    radial-gradient(80% 120% at 50% 0%, rgba(37,99,235,0.10), transparent 65%),
    linear-gradient(180deg, #FFFFFF, #FFFFFF);
  overflow: hidden;
}
.cta-inner::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(15,23,42,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15,23,42,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(60% 60% at 50% 0%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(60% 60% at 50% 0%, #000, transparent 75%);
}
.cta-inner > * { position: relative; }
.cta-inner .badge { margin-bottom: 22px; }
.cta-inner .section-title { max-width: 18ch; margin-inline: auto; }
.cta-inner .waitlist-form { margin-top: 30px; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { position: relative; }
.site-footer::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: min(1040px, 88%); height: 1px;
  background: linear-gradient(to right, transparent, var(--border) 20%, var(--border) 80%, transparent);
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  padding: 32px 24px;
}
.logo-sm .logo-word { font-size: 0.95rem; }
.footer-meta { color: var(--text-faint); font-size: 0.84rem; }
.footer-link { color: var(--text-muted); font-size: 0.88rem; transition: color .2s; }
.footer-link:hover { color: var(--accent-2); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1080px) {
  .card-grid-3 { grid-template-columns: 1fr; }
}
@media (max-width: 820px) {
  .card-grid { grid-template-columns: 1fr; }
  .header-nav .nav-link { display: none; }
}
@media (max-width: 560px) {
  .wrap { padding-inline: 18px; }
  .field-row { flex-direction: column; }
  .field-row input, .field-row .btn { width: 100%; }
  .hero-title { font-size: clamp(2.1rem, 9vw, 2.8rem); }
  .hero-figure { margin-top: -60px; }
  .footer-inner { justify-content: center; text-align: center; }
}

/* ============================================================
   Reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .packet { display: none; }
}