/* ==========================================================================
   Akilum — Design System
   Brand: navy + steel blue + red accent + pale blue background
   Type: Inter, large sizes for laptop readability
   ========================================================================== */

:root {
  --navy: #0F2A47;
  --navy-deep: #081A2E;
  --blue: #1E5A8F;
  --blue-bright: #3B82F6;
  --blue-pale: #EAF1F8;
  --red: #E63946;
  --red-dark: #C92A37;
  --text: #14202E;
  --text-muted: #56697E;
  --white: #FFFFFF;
  --border: #D8E1EC;

  --max-width: 1280px;
  --content-width: 1080px;
  --reveal-duration: 0.9s;
  --reveal-easing: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--red); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--navy);
  margin: 0 0 1rem 0;
}
h1 { font-size: clamp(3rem, 8vw, 6.5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(2.5rem, 5vw, 4.25rem); }
h3 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h4 { font-size: clamp(1.4rem, 2vw, 1.75rem); }
p  { margin: 0 0 1.25rem 0; }
.lead { font-size: 1.6rem; line-height: 1.5; color: var(--text-muted); max-width: 65ch; }
.eyebrow {
  display: inline-block;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 1.5rem;
}
.eyebrow.on-dark { color: #FFB4BA; }

/* ---------- Layout ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; }
.content   { max-width: var(--content-width); margin: 0 auto; }
.section   { padding: 8rem 0; position: relative; }
.section--lg { padding: 12rem 0; }
.section--pale { background: var(--blue-pale); }
.section--navy { background: var(--navy); color: #DCE7F0; }
.section--navy h1, .section--navy h2, .section--navy h3 { color: #FFFFFF; }
.section--navy .lead { color: #B7C7DC; }

/* ---------- Sticky nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 1.25rem 2rem;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
}
.nav.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex; align-items: center; gap: 0.75rem;
  font-weight: 800; font-size: 1.5rem; letter-spacing: -0.02em;
  color: var(--white);
}
.nav.scrolled .nav-brand { color: var(--navy); }
.nav-logo {
  width: 40px; height: 40px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--blue-bright), var(--blue));
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 8px rgba(30, 90, 143, 0.3);
}
.nav-links { display: flex; gap: 2.5rem; align-items: center; }
.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 600;
  font-size: 1.1rem;
}
.nav.scrolled .nav-links a { color: var(--navy); }
.nav-links a:hover { color: var(--red); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 1.1rem 2rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1.2rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  text-decoration: none;
  white-space: nowrap;
}
.btn--primary {
  background: var(--red);
  color: var(--white);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.35);
}
.btn--primary:hover {
  background: var(--red-dark);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(230, 57, 70, 0.45);
}
.btn--secondary {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.4);
}
.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--white);
  color: var(--white);
}
.btn--ghost {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}
.btn--ghost:hover { background: var(--navy); color: var(--white); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  position: relative;
  overflow: hidden;
  color: var(--white);
}
.hero-bg {
  position: absolute; inset: 0;
  background: url('../images/stock/hero-workers-rebar.jpg') center/cover no-repeat;
  filter: brightness(0.75);
  z-index: 0;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(
    180deg,
    rgba(8, 26, 46, 0.33) 0%,
    rgba(8, 26, 46, 0.58) 60%,
    rgba(8, 26, 46, 0.83) 100%
  );
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 12rem 2rem 8rem 19.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}
.hero h1 {
  color: var(--white);
  max-width: 18ch;
}
.hero h1 .accent { color: var(--red); }
.hero .lead {
  color: #FFFFFF;
  font-size: 1.75rem;
  font-weight: 500;
  max-width: 38ch;
  margin: 2rem 0 3rem;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- Sections ---------- */
.section-head {
  max-width: 50rem;
  margin-bottom: 4rem;
}

/* ---------- Problem grid ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}
.card {
  background: var(--white);
  border-radius: 18px;
  padding: 2.5rem;
  border: 1px solid var(--border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(15, 42, 71, 0.1);
}
.card .num {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 3rem;
  color: var(--red);
  line-height: 1;
  margin-bottom: 0.75rem;
}
.card h3 { font-size: 1.75rem; margin-bottom: 0.75rem; }
.card p { color: var(--text-muted); font-size: 1.2rem; margin: 0; }

/* ---------- The shift (split layout) ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.split--reverse > :first-child { order: 2; }
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 3rem; }
  .split--reverse > :first-child { order: 0; }
}
.split-image {
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(15, 42, 71, 0.18);
}

/* ---------- Pillars ---------- */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}
.pillar {
  background: var(--blue-pale);
  border-radius: 18px;
  padding: 3rem 2.5rem;
  border-top: 5px solid var(--blue);
}
.pillar h3 {
  color: var(--navy);
  margin-bottom: 1rem;
}
.pillar p { color: var(--text); font-size: 1.15rem; margin: 0; }

/* ---------- Proof / screenshots ---------- */
.proof-shot {
  background: var(--white);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: 0 25px 70px rgba(15, 42, 71, 0.25);
  border: 1px solid var(--border);
}
.proof-shot img { border-radius: 8px; }
.proof-caption {
  margin-top: 1.25rem;
  text-align: center;
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.section--navy .proof-caption { color: #8FA3BD; }

/* ---------- KPI row ---------- */
.kpi-row {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 4rem;
  align-items: center;
}
.kpi-row--image-wide { grid-template-columns: 1.4fr 1fr; }
@media (max-width: 900px) {
  .kpi-row,
  .kpi-row--image-wide { grid-template-columns: 1fr; }
  /* On mobile, force text-above-chart even when the image appears first
     in source order (as it does in the --image-wide variant). */
  .kpi-row--image-wide > .proof-shot { order: 2; }
}

/* ---------- Founder ---------- */
.founder {
  display: flex;
  gap: 3rem;
  align-items: center;
  background: var(--white);
  padding: 4rem;
  border-radius: 24px;
  border: 1px solid var(--border);
}
@media (max-width: 700px) { .founder { flex-direction: column; padding: 2rem; text-align: center; } }
.founder-avatar {
  width: 160px; height: 160px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--navy));
  color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 4rem; letter-spacing: -0.02em;
  flex-shrink: 0;
  box-shadow: 0 12px 32px rgba(30, 90, 143, 0.3);
}
.founder-name { font-size: 1.5rem; font-weight: 700; color: var(--navy); margin: 0.5rem 0 0.25rem; }
.founder-title { color: var(--text-muted); font-size: 1.1rem; }

/* ---------- Final CTA ---------- */
.cta-block {
  text-align: center;
  padding: 6rem 2rem;
}
.cta-block h2 {
  color: var(--white);
  font-size: clamp(2.5rem, 6vw, 5rem);
  margin-bottom: 1.5rem;
}
.cta-block p {
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 40rem;
  margin: 0 auto 3rem;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, 0.75);
  padding: 4rem 2rem 2rem;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}
@media (max-width: 700px) { .footer-inner { grid-template-columns: 1fr; gap: 2rem; } }
.footer h4 { color: var(--white); font-size: 1.1rem; margin-bottom: 1rem; letter-spacing: 0.05em; text-transform: uppercase; }
.footer a { color: rgba(255, 255, 255, 0.75); display: block; padding: 0.4rem 0; font-size: 1.05rem; }
.footer a:hover { color: var(--white); }
.footer-bottom {
  max-width: var(--max-width);
  margin: 3rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

/* ==========================================================================
   YouTube facade — clean poster + play button, no title overlays.
   Iframe loads only on click (faster page + no YouTube chrome until needed).
   ========================================================================== */
.yt-facade {
  position: relative;
  aspect-ratio: 16 / 9;
  max-width: 1100px;
  margin: 0 auto;
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  outline: none;
}
.yt-facade:focus-visible {
  box-shadow: 0 0 0 4px var(--red), 0 30px 80px rgba(0, 0, 0, 0.45);
}
.yt-facade img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}
.yt-facade::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.18) 0%, rgba(0,0,0,0.45) 100%);
  transition: background 0.3s ease;
  pointer-events: none;
}
.yt-facade:hover img { transform: scale(1.03); }
.yt-facade:hover::after { background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.35) 100%); }
.yt-play {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
  z-index: 2;
  filter: drop-shadow(0 6px 22px rgba(0, 0, 0, 0.55));
  transition: transform 0.2s ease;
}
.yt-facade:hover .yt-play { transform: translate(-50%, -50%) scale(1.08); }
.yt-caption {
  position: absolute;
  bottom: 20px; left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  z-index: 2;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  pointer-events: none;
}
.yt-facade iframe {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  border: 0;
}
.yt-facade.loaded { cursor: default; }
.yt-facade.loaded::after { display: none; }

/* ==========================================================================
   Scroll Reveal — the "ever-expanding blocks" effect
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(50px) scale(0.96);
  transition:
    opacity var(--reveal-duration) var(--reveal-easing),
    transform var(--reveal-duration) var(--reveal-easing);
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0) scale(1);
}

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

/* ==========================================================================
   Mobile breakpoints — keep narrow screens from inheriting desktop offsets.
   The hero's 19.5rem left padding pushes content off a 375px-wide iPhone;
   the nav's flex spacing also gets cramped. Reset to safe defaults < 768px.
   ========================================================================== */
@media (max-width: 768px) {
  .hero-content {
    padding: 8rem 1.5rem 4rem;
  }
  .hero h1 { font-size: clamp(2.5rem, 12vw, 4rem); }
  .hero .lead { font-size: 1.25rem; }

  .nav { padding: 1rem; }
  .nav-links { gap: 1rem; }
  .nav-links a {
    font-size: 0.95rem;
  }
  /* Hide the secondary nav text links on tiny screens, keep the Book Demo CTA */
  .nav-links a:not(.btn) { display: none; }

  .section,
  .section--lg { padding: 4rem 0; }

  .container { padding: 0 1.25rem; }
}