/* ============================================================
   BIOSCALE LIMITED — style.css
   Dark, bold, yellow-accent design inspired by reference
   ============================================================ */

/* ---------- RESET & BASE ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:   #0a0a0a;
  --dark:    #111111;
  --dark2:   #181818;
  --dark3:   #1e1e1e;
  --dark4:   #242424;
  --white:   #ffffff;
  --gray:    #888888;
  --gray2:   #555555;
  --accent:  #f5c518;
  --accent2: #e8b000;
  --accent-dim: rgba(245,197,24,0.12);
  --font-main: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --nav-h: 80px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--black);
  color: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

.container {
  width: 90%;
  max-width: 1280px;
  margin: 0 auto;
}

/* ---------- TYPOGRAPHY ---------- */
.accent { color: var(--accent); }

.section-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-main);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--white);
}

.section-sub {
  font-size: 1.05rem;
  color: var(--gray);
  max-width: 560px;
  line-height: 1.8;
  margin: 1.5rem auto 0;
}

.section-num {
  font-family: var(--font-main);
  font-size: 6rem;
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 1px var(--dark4);
  line-height: 1;
  user-select: none;
  flex-shrink: 0;
}

/* ---------- BUTTONS ---------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--accent);
  color: var(--black);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  padding: 0.9rem 2rem;
  border: 2px solid var(--accent);
  cursor: pointer;
  transition: all 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--black);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s var(--ease);
  z-index: 0;
}
.btn-primary:hover::before { transform: scaleX(1); transform-origin: left; }
.btn-primary:hover { color: var(--accent); }
.btn-primary span, .btn-primary .btn-arrow { position: relative; z-index: 1; }
.btn-primary.large { font-size: 1.1rem; padding: 1.1rem 2.5rem; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--white);
  font-family: var(--font-main);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  padding: 0.9rem 1.5rem;
  border: 1px solid rgba(255,255,255,0.15);
  transition: all 0.3s var(--ease);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-arrow {
  transition: transform 0.3s var(--ease);
}
.btn-primary:hover .btn-arrow { transform: translateX(4px); }

/* ---------- NAVBAR ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  transition: background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
}
.navbar.scrolled {
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.05);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: 90%;
  max-width: 1280px;
  margin: 0 auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  transition: opacity 0.3s;
}
.nav-logo:hover { opacity: 0.8; }
.logo-bs {
  font-size: 1.5rem;
  color: var(--accent);
  font-weight: 900;
}
.logo-text { color: var(--white); }
.logo-tag {
  font-size: 0.55rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--gray);
  margin-left: 0.5rem;
  margin-top: 0.4rem;
  align-self: flex-end;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-link {
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  position: relative;
  transition: color 0.3s;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}
.nav-link:hover, .nav-link.active { color: var(--white); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.nav-cta {
  font-family: var(--font-main);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--black);
  background: var(--accent);
  padding: 0.6rem 1.4rem;
  transition: all 0.3s var(--ease);
}
.nav-cta:hover { background: var(--white); color: var(--black); }

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all 0.3s var(--ease);
}
.nav-burger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('hero_bg.png');
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  transition: transform 0s;
  will-change: transform;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10,10,10,0.92) 0%,
    rgba(10,10,10,0.75) 50%,
    rgba(10,10,10,0.88) 100%
  );
}

#particles-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 90%;
  max-width: 1280px;
  margin: 0 auto;
  padding-top: calc(var(--nav-h) + 2rem);
  padding-bottom: 6rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 2rem;
}
.tag-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245,197,24,0.6); }
  50% { box-shadow: 0 0 0 8px rgba(245,197,24,0); }
}

.hero-title {
  font-family: var(--font-main);
  font-size: clamp(3.5rem, 9vw, 8rem);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.02em;
  margin-bottom: 1.8rem;
}
.hero-title .line {
  display: block;
  overflow: hidden;
}
.hero-title .line span {
  display: inline-block;
  transform: translateY(110%);
  animation: lineUp 0.8s var(--ease) forwards;
}

.hero-sub {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.8;
  max-width: 520px;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  flex-wrap: wrap;
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat-num {
  font-family: var(--font-main);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.stat-sym {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
  margin-top: 0.3rem;
}
.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--dark4);
}

.hero-scroll-indicator {
  position: absolute;
  right: 5%;
  bottom: 3rem;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 1rem;
  writing-mode: vertical-rl;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray);
}
.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollLineAnim 2s ease-in-out infinite;
}
@keyframes scrollLineAnim {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

.hero-number {
  position: absolute;
  left: 2%;
  bottom: 3rem;
  font-family: var(--font-main);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--gray2);
  z-index: 2;
}

/* ---------- MARQUEE ---------- */
.marquee-strip {
  background: var(--accent);
  padding: 0.75rem 0;
  overflow: hidden;
  white-space: nowrap;
}
.marquee-track {
  display: inline-flex;
  align-items: center;
  gap: 0;
  animation: marquee 30s linear infinite;
}
.marquee-track span {
  font-family: var(--font-main);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--black);
  padding: 0 1.5rem;
}
.marquee-track .sep {
  color: rgba(0,0,0,0.4);
  padding: 0;
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ---------- SECTION HEADER ---------- */
.section-header {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 4rem;
}
.section-header.centered {
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.section-title-group { display: flex; flex-direction: column; }

/* ---------- SERVICES ---------- */
.services {
  position: relative;
  padding: 8rem 0;
  overflow: hidden;
}
.services-bg {
  position: absolute;
  inset: 0;
  background-image: url('services_bg.png');
  background-size: cover;
  background-position: center;
  transform: scale(1.1);
  will-change: transform;
}
.services-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(10,10,10,0.95) 0%,
    rgba(10,10,10,0.88) 50%,
    rgba(10,10,10,0.95) 100%
  );
}
.services .container { position: relative; z-index: 1; }

.services-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.service-item {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--dark4);
  transition: all 0.3s var(--ease);
  cursor: default;
}
.service-item:first-child { border-top: 1px solid var(--dark4); }
.service-item:hover { padding-left: 1rem; border-color: rgba(245,197,24,0.4); }
.service-item:hover .service-index { color: var(--accent); }
.service-item:hover .service-arrow { color: var(--accent); opacity: 1; transform: translateX(6px); }

.service-index {
  font-family: var(--font-main);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--gray2);
  width: 3rem;
  flex-shrink: 0;
  transition: color 0.3s;
}
.service-body { flex: 1; }
.service-name {
  font-family: var(--font-main);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.25rem;
  transition: color 0.3s;
}
.service-item:hover .service-name { color: var(--accent); }
.service-desc {
  font-size: 0.88rem;
  color: var(--gray);
  line-height: 1.7;
  max-width: 600px;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s var(--ease);
}
.service-item:hover .service-desc { opacity: 1; max-height: 80px; margin-top: 0.4rem; }
.service-arrow {
  font-size: 1.2rem;
  color: var(--gray2);
  opacity: 0;
  transition: all 0.3s var(--ease);
}

.section-big-text {
  position: absolute;
  bottom: -2rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-main);
  font-size: clamp(5rem, 15vw, 14rem);
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255,255,255,0.04);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  letter-spacing: 0.05em;
}

/* ---------- ABOUT ---------- */
.about {
  padding: 8rem 0;
  background: var(--dark);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}
.about-left { display: flex; flex-direction: column; gap: 0; }
.about-left .section-num { margin-bottom: 1rem; }
.about-left .section-eyebrow { margin-bottom: 0.75rem; }
.about-left .section-title { margin-bottom: 2rem; }
.about-highlight {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}
.highlight-bar {
  width: 3px;
  min-height: 80px;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 0.25rem;
}
.about-highlight p {
  font-size: 1rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.8;
}

.about-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.about-card {
  background: var(--dark3);
  border: 1px solid var(--dark4);
  padding: 2rem;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}
.about-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.about-card:hover::before { transform: scaleX(1); }
.about-card:hover {
  border-color: rgba(245,197,24,0.25);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.about-card-icon { font-size: 1.8rem; margin-bottom: 1rem; }
.about-card h4 {
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.75rem;
}
.about-card p { font-size: 0.85rem; color: var(--gray); line-height: 1.7; }

/* ---------- EXPERTISE ---------- */
.expertise {
  position: relative;
  padding: 8rem 0;
  overflow: hidden;
  background: var(--black);
}
.expertise-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(245,197,24,0.06) 0%, transparent 70%);
  will-change: transform;
}
.expertise-overlay {
  position: absolute;
  inset: 0;
  background: var(--black);
  opacity: 0.7;
}
.expertise .container { position: relative; z-index: 1; }
.expertise .section-header { margin-bottom: 5rem; }

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}
.expertise-card {
  background: var(--dark2);
  padding: 3rem 2.5rem;
  border: 1px solid var(--dark4);
  position: relative;
  transition: all 0.4s var(--ease);
  overflow: hidden;
}
.expertise-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(245,197,24,0.05) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.4s;
}
.expertise-card:hover::after { opacity: 1; }
.expertise-card:hover { transform: translateY(-6px); border-color: rgba(245,197,24,0.3); }

.exp-icon-wrap {
  margin-bottom: 2rem;
}
.exp-icon {
  width: 56px; height: 56px;
  border: 1px solid var(--dark4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--accent);
  transition: all 0.3s var(--ease);
}
.expertise-card:hover .exp-icon {
  background: var(--accent);
  color: var(--black);
  border-color: var(--accent);
}
.expertise-card h3 {
  font-family: var(--font-main);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1rem;
}
.expertise-card p { font-size: 0.88rem; color: var(--gray); line-height: 1.75; margin-bottom: 1.5rem; }

.exp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.exp-tags li {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.3rem 0.75rem;
  border: 1px solid rgba(245,197,24,0.2);
}

/* ---------- WHY BIOSCALE ---------- */
.why {
  padding: 8rem 0;
  background: var(--dark2);
}
.why-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}
.why-left { display: flex; flex-direction: column; gap: 1.5rem; }
.why-desc { font-size: 1rem; color: rgba(255,255,255,0.55); line-height: 1.8; max-width: 420px; }
.why-right { display: flex; flex-direction: column; gap: 0; }
.why-item {
  display: flex;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--dark4);
  align-items: flex-start;
  transition: padding-left 0.3s var(--ease);
}
.why-item:first-child { border-top: 1px solid var(--dark4); }
.why-item:hover { padding-left: 0.5rem; }
.why-num {
  font-family: var(--font-main);
  font-size: 1.5rem;
  font-weight: 800;
  flex-shrink: 0;
  line-height: 1;
  margin-top: 0.1rem;
}
.why-text h4 {
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.5rem;
}
.why-text p { font-size: 0.88rem; color: var(--gray); line-height: 1.7; }

/* ---------- CONTACT ---------- */
.contact {
  position: relative;
  padding: 8rem 0 6rem;
  overflow: hidden;
  background: var(--black);
}
.contact-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(245,197,24,0.08) 0%, transparent 65%);
  will-change: transform;
}
.contact-overlay { position: absolute; inset: 0; background: var(--black); opacity: 0.6; }
.contact .container { position: relative; z-index: 1; }
.contact .section-header { margin-bottom: 4rem; }
.contact .section-num { position: static; font-size: 5rem; color: transparent; -webkit-text-stroke: 1px var(--dark4); margin-bottom: 0.5rem; display: block; }

.contact-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--dark4);
  margin-bottom: 3rem;
}
.contact-card {
  background: var(--dark2);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: all 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}
.contact-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 100%; height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.4s var(--ease);
}
.contact-card:hover::before { transform: scaleX(1); }
.contact-card:hover { background: var(--dark3); }

.cc-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
}
.cc-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray);
}
.cc-value {
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--white);
  line-height: 1.4;
}

.contact-cta-block {
  text-align: center;
  padding-top: 1rem;
}

/* ---------- FOOTER ---------- */
.footer {
  background: var(--dark);
  border-top: 1px solid var(--dark4);
  padding-top: 5rem;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  padding-bottom: 4rem;
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.footer-logo {
  margin-bottom: 0.5rem;
}
.footer-tagline {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.7;
}
.footer-reg {
  font-size: 0.72rem;
  color: var(--gray2);
  letter-spacing: 0.02em;
  line-height: 1.6;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.footer-col h5 {
  font-family: var(--font-main);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
.footer-col ul { display: flex; flex-direction: column; gap: 0.75rem; }
.footer-col li a, .footer-col li {
  font-size: 0.85rem;
  color: var(--gray);
  transition: color 0.3s;
  line-height: 1.5;
}
.footer-col li a:hover { color: var(--white); }

.footer-bottom {
  border-top: 1px solid var(--dark4);
  padding: 1.5rem 0;
}
.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--gray2);
}

/* ---------- REVEAL ANIMATIONS ---------- */
.reveal-up, .reveal-left, .reveal-right {
  opacity: 0;
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal-up { transform: translateY(40px); }
.reveal-left { transform: translateX(-40px); }
.reveal-right { transform: translateX(40px); }

.reveal-up.visible,
.reveal-left.visible,
.reveal-right.visible {
  opacity: 1;
  transform: translate(0);
}

/* Stagger delays */
.reveal-up:nth-child(1), .reveal-right:nth-child(1), .reveal-left:nth-child(1) { transition-delay: 0.0s; }
.reveal-up:nth-child(2), .reveal-right:nth-child(2) { transition-delay: 0.1s; }
.reveal-up:nth-child(3), .reveal-right:nth-child(3) { transition-delay: 0.2s; }
.reveal-up:nth-child(4), .reveal-right:nth-child(4) { transition-delay: 0.3s; }
.reveal-up:nth-child(5) { transition-delay: 0.4s; }
.reveal-up:nth-child(6) { transition-delay: 0.5s; }
.reveal-up:nth-child(7) { transition-delay: 0.6s; }
.reveal-up:nth-child(8) { transition-delay: 0.7s; }

/* ---------- PARALLAX ---------- */
.parallax-bg { will-change: transform; }

/* ---------- CUSTOM SCROLLBAR ---------- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--dark4); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 4rem; }
  .expertise-grid { grid-template-columns: 1fr 1fr; }
  .why-inner { grid-template-columns: 1fr; gap: 4rem; }
  .contact-cards { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: 3rem; }
}

@media (max-width: 768px) {
  :root { --nav-h: 68px; }
  .nav-links, .nav-cta { display: none; }
  .nav-burger { display: flex; }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0; bottom: 0;
    background: rgba(10,10,10,0.98);
    backdrop-filter: blur(20px);
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    z-index: 999;
  }
  .nav-links.mobile-open .nav-link { font-size: 1.4rem; }
  .hero-title { font-size: clamp(2.8rem, 10vw, 5rem); }
  .section-title { font-size: clamp(2rem, 7vw, 3rem); }
  .expertise-grid { grid-template-columns: 1fr; }
  .contact-cards { grid-template-columns: 1fr 1fr; }
  .about-right { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .hero-stats { gap: 1.5rem; }
  .stat-num { font-size: 1.8rem; }
  .hero-scroll-indicator { display: none; }
}

@media (max-width: 480px) {
  .contact-cards { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .why-inner { gap: 3rem; }
  .section-num { font-size: 4rem; }
}