/* ==========================================================================
   Bulsu Labs — Probe-inspired structure, sharp & confident
   ========================================================================== */

:root {
  /* Brand */
  --brand: #0a3eff;            /* electric blue (Probe match) */
  --brand-2: #0833d6;
  --navy: #10296e;             /* deep navy tile */
  --ink: #202020;              /* near-black headlines */
  --ink-2: #5a5a64;            /* secondary text */
  --ink-3: #9398a3;            /* tertiary / labels */
  --line: rgba(20, 24, 38, 0.10);
  --line-2: rgba(20, 24, 38, 0.06);
  --bg: #ffffff;
  --bg-2: #f5f5f7;             /* alt section bg */
  --bg-card: #ffffff;

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

  /* Sizing & spacing */
  --container: 1380px;
  --container-pad: 40px;
  --section-pad-y: 120px;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; padding: 0; }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; padding: 0; margin: 0; }

::selection { background: var(--brand); color: #fff; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: #fff; padding: 12px 16px; z-index: 999;
}
.skip-link:focus { left: 16px; top: 16px; }

/* Footer z-index above the hero canvas */
.nav, main, .foot { position: relative; z-index: 2; }

/* ============ NAV ============ */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.78);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--line-2);
  z-index: 100;
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--container-pad);
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  font-size: 30px;
  letter-spacing: -0.02em;
  color: var(--brand);
  text-decoration: none;
}
.brand-name { color: var(--brand); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink-2);
}
.nav-links a {
  position: relative;
  padding: 6px 0;
  transition: color 200ms var(--ease-out);
}
.nav-links a:hover { color: var(--ink); }

.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand);
  color: #fff;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 0;
  transition: background 180ms var(--ease-out), transform 180ms var(--ease-out);
}
.btn-pill:hover { background: var(--brand-2); transform: translateY(-1px); }
.btn-pill .arrow { font-size: 14px; line-height: 1; }

.nav-mobile-toggle { display: none; }

.nav-mobile {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  padding: 24px var(--container-pad);
  flex-direction: column;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  z-index: 99;
  font-size: 18px;
}
.nav-mobile.open { display: flex; }
.nav-mobile a { color: var(--ink); padding: 8px 0; }

/* ============ HERO ============ */
.hero {
  padding: 120px var(--container-pad) 40px;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  height: 100vh;
}
.hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 2;
  min-height: calc(100vh - 160px);
}

/* Wave canvas — escapes padding box, fills entire hero top-to-bottom and edge-to-edge */
.hero-wave {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  display: block;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 643px) minmax(0, 360px);
  align-items: start;
  justify-content: space-between;
  gap: 80px;
  padding-top: 44px;
}
.hero-h1 {
  margin: 0;
  font-size: clamp(40px, 5.4vw, 76px);
  font-weight: 500;
  line-height: 1.0;
  letter-spacing: -0.04em;
  color: var(--ink);
}
.hero-sub {
  margin: 0;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 360px;
  font-weight: 500;
  align-self: end;
}

.hero-tiles {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: auto;
  padding-top: 60px;
  padding-bottom: 40px;
}
.cta-tile {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 262px;
  height: 150px;
  padding: 18px 22px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 0;
  color: #fff;
  position: relative;
  transition: transform 220ms var(--ease-out), filter 220ms var(--ease-out);
}
.cta-tile:hover { transform: translateY(-3px); filter: brightness(1.05); }
.cta-tile-blue { background: var(--brand); }
.cta-tile-navy { background: var(--navy); }
.cta-tile-label { font-size: 14px; }
.cta-tile-arrow {
  align-self: flex-end;
  font-size: 22px;
  line-height: 1;
  margin-top: auto;
}

/* ============ TRUST STRIP ============ */
.trust {
  padding: 80px var(--container-pad) 40px;
  background: var(--bg);
  border-top: 1px solid var(--line-2);
}
.trust-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}
.trust-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}
.trust-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 36px 56px;
  font-size: 18px;
  font-weight: 500;
  color: var(--ink-2);
  opacity: 0.85;
}

/* ============ BLOCKS (sections) ============ */
.block {
  padding: var(--section-pad-y) var(--container-pad);
  position: relative;
}
.block.alt { background: var(--bg-2); }
.block-inner {
  max-width: var(--container);
  margin: 0 auto;
}
.eyebrow {
  margin: 0 0 18px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
}
.block-h2 {
  margin: 0 0 22px;
  font-size: clamp(30px, 3.6vw, 49px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--ink);
  max-width: 820px;
}
.block-lede {
  margin: 0 0 56px;
  font-size: clamp(15px, 1.15vw, 17px);
  color: var(--ink-2);
  max-width: 640px;
  line-height: 1.6;
}

/* ============ GRID ============ */
.grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.cell {
  background: var(--bg-card);
  padding: 36px 32px 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  transition: background 220ms var(--ease-out);
}
.cell:hover { background: #fafafb; }
.cell h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
}
.cell-num,
.step-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--brand);
  letter-spacing: 0.04em;
  margin-bottom: 18px;
}
.step-tag { color: var(--ink-3); }

.pillar h3 { font-size: 22px; }
.pillar p { font-size: 15px; }
.pillar { padding: 44px 36px 48px; }

/* ============ NUMBERS ============ */
.numbers-block .grid { background: transparent; border: 0; }
.numbers-block .stat {
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.stat-num {
  font-size: clamp(40px, 4vw, 56px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1;
  color: var(--ink);
}
.stat p { margin: 0; color: var(--ink-2); font-size: 15px; line-height: 1.5; }

/* ============ PRICING ============ */
.pricing-grid { background: var(--line); border: 1px solid var(--line); }
.price-card {
  background: var(--bg-card);
  padding: 40px 32px 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  transition: background 220ms var(--ease-out);
}
.price-card.featured { background: #fafafb; }
.price-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--brand);
  color: #fff;
  padding: 6px 10px;
}
.price-head h3 {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.price-sub {
  margin: 0;
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.price-amount {
  font-size: 56px;
  line-height: 1;
  font-weight: 500;
  letter-spacing: -0.035em;
  color: var(--ink);
  display: flex;
  align-items: flex-start;
  gap: 4px;
}
.price-currency { font-size: 28px; padding-top: 8px; color: var(--ink-2); }
.price-meta {
  margin: -10px 0 0;
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.price-monthly {
  margin: 14px 0 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
  background: rgba(10, 62, 255, 0.05);
  border-left: 2px solid var(--brand);
  border-radius: 0 6px 6px 0;
}
.price-monthly-amount {
  font-size: 18px;
  font-weight: 500;
  color: var(--brand);
  letter-spacing: -0.01em;
}
.price-monthly-unit { font-size: 13px; font-weight: 400; color: var(--ink-2); }
.price-monthly-label {
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.price-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 12px 0 24px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}
.price-list li {
  font-size: 14px;
  color: var(--ink-2);
  position: relative;
  padding-left: 22px;
  line-height: 1.5;
}
.price-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 2px;
  background: var(--brand);
}
.btn-flat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  padding: 10px 0;
  border-top: 1px solid var(--line);
  margin-top: auto;
}
.btn-flat .arrow { color: var(--brand); }
.btn-flat:hover .arrow { transform: translate(2px, -2px); transition: transform 180ms var(--ease-out); }
.btn-solid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--brand);
  color: #fff;
  padding: 14px 22px;
  font-size: 13px;
  font-weight: 500;
  margin-top: auto;
  border-radius: 0;
  transition: background 180ms var(--ease-out);
}
.btn-solid:hover { background: var(--brand-2); }
.btn-block { width: 100%; padding: 16px 22px; font-size: 14px; }

.price-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}
.price-actions .btn-flat {
  margin-top: 0;
  padding: 4px 0 0;
  border-top: 0;
  font-size: 12px;
  color: var(--ink-3);
  justify-content: center;
}
.btn-buy {
  cursor: pointer;
  border: 0;
  font-family: inherit;
  line-height: 1.2;
}
.btn-buy[disabled] { opacity: 0.6; cursor: wait; }

.price-foot {
  margin: 36px 0 0;
  font-size: 13px;
  color: var(--ink-3);
  text-align: center;
}

/* ============ CONTACT ============ */
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 80px;
  align-items: start;
}
.contact-copy .block-h2 { margin-bottom: 18px; }
.contact-points {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.contact-points li {
  font-size: 14px;
  color: var(--ink-2);
  position: relative;
  padding-left: 22px;
}
.contact-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 2px;
  background: var(--brand);
}
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field span {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 14px 14px;
  transition: border-color 180ms var(--ease-out);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 0;
  border-color: var(--brand);
}
.field textarea { resize: vertical; min-height: 120px; }
.form-foot {
  margin: 0;
  font-size: 12px;
  color: var(--ink-3);
  text-align: center;
}

/* ============ BLOG ============ */
.blog-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 48px;
  max-width: 820px;
}
.post-card {
  display: block;
  padding: 32px 36px;
  border: 1px solid var(--line);
  background: #fff;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 220ms var(--ease-out), transform 220ms var(--ease-out);
}
.post-card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
}
.post-meta {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.post-title {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.25;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.post-excerpt {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-2);
}
.post-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--brand);
}

/* ============ CTA SPLIT ============ */
.cta-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
}
.cta-split-tile {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 32px;
  padding: 80px 60px;
  min-height: 360px;
  color: #fff;
  transition: filter 220ms var(--ease-out);
}
.cta-split-tile:hover { filter: brightness(1.05); }
.cta-split-blue { background: var(--brand); }
.cta-split-navy { background: var(--navy); }
.cta-split-eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
}
.cta-split-title {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 48px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.025em;
  max-width: 420px;
}
.cta-split-action {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 500;
  margin-top: auto;
}
.cta-split-action .arrow { font-size: 18px; }

/* ============ FOOTER ============ */
.foot {
  background: #ffffff;
  padding: 80px var(--container-pad) 32px;
  border-top: 1px solid var(--line);
}
.foot-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 56px;
  margin-bottom: 56px;
}
.foot-brand .brand { margin-bottom: 18px; }
.foot-tag {
  margin: 0;
  font-size: 14px;
  color: var(--ink-2);
  max-width: 320px;
  line-height: 1.55;
}
.foot-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.foot-h {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
  margin-bottom: 6px;
}
.foot-col a {
  font-size: 14px;
  color: var(--ink-2);
  transition: color 180ms var(--ease-out);
}
.foot-col a:hover { color: var(--ink); }
.foot-bar {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--line-2);
  font-size: 12px;
  color: var(--ink-3);
}
.foot-bar p { margin: 0; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; gap: 48px; }
  .foot-inner { grid-template-columns: 1.4fr 1fr 1fr; }
  .foot-brand { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  :root { --section-pad-y: 80px; --container-pad: 24px; }
  .nav-links { display: none; }
  .nav-mobile-toggle {
    display: inline-flex;
    margin-left: auto;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
  }
  .nav-mobile-toggle span,
  .nav-mobile-toggle span::before,
  .nav-mobile-toggle span::after {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--ink);
    position: relative;
  }
  .nav-mobile-toggle span::before { content: ""; position: absolute; top: -6px; left: 0; }
  .nav-mobile-toggle span::after { content: ""; position: absolute; top: 6px; left: 0; }

  .hero { padding: 80px 24px 60px; min-height: 80vh; }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 24px;
  }
  .hero-h1 { font-size: clamp(36px, 9vw, 56px); }
  .hero-sub { max-width: 100%; align-self: start; }
  .hero-tiles { padding-top: 48px; flex-direction: column; align-items: stretch; }
  .cta-tile { width: 100%; height: 130px; }

  .trust { padding: 60px 24px 30px; }
  .trust-list { gap: 18px 32px; font-size: 16px; }

  .grid-2 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }

  .contact-form { padding: 24px; }
  .field-row { grid-template-columns: 1fr; gap: 18px; }

  .cta-split { grid-template-columns: 1fr; }
  .cta-split-tile { padding: 56px 32px; min-height: 280px; }

  .foot-inner { grid-template-columns: 1fr 1fr; gap: 36px; }
  .foot-bar { flex-direction: column; gap: 8px; align-items: flex-start; }
}

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