/* ══════════════════════════════════
   HOMEPAGE HERO
   ══════════════════════════════════ */

.osb-hero {
  position: relative;
  width: 100%;
  height: 100vh;
  margin-top: -90px;
  overflow: hidden;
  background: var(--osb-charcoal);
}

.osb-hero__bg {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  z-index: 1;
}

.osb-hero__bg img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.osb-hero__overlay {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  z-index: 2;
  background: linear-gradient(180deg,
    rgba(17, 17, 17, 0.3) 0%,
    rgba(17, 17, 17, 0.15) 30%,
    rgba(17, 17, 17, 0.45) 60%,
    rgba(17, 17, 17, 0.8) 100%
  );
}

.osb-hero__grid {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  z-index: 3;
  opacity: 0.04;
  background-image:
    linear-gradient(90deg, var(--osb-silver) 1px, transparent 1px),
    linear-gradient(180deg, var(--osb-silver) 1px, transparent 1px);
  background-size: 120px 120px;
  pointer-events: none;
}

.osb-hero__inner {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  z-index: 5;
  display: flex;
  align-items: center;
  padding-top: 90px;
  padding-bottom: 60px;
}

.osb-hero__content {
  max-width: var(--osb-container-max);
  margin: 0 auto;
  width: 100%;
  padding: 0 48px;
}

.osb-hero__label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(20px);
  animation: osbFadeUp 0.8s ease forwards 0.2s;
}

.osb-hero__label-line {
  width: 32px; height: 1px;
  background: var(--osb-brass);
}

.osb-hero__label-text {
  font-family: var(--osb-font-heading);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--osb-brass);
}

.osb-hero__heading {
  font-family: var(--osb-font-heading);
  font-size: clamp(38px, 5.5vw, 72px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--osb-off-white);
  max-width: 820px;
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(24px);
  animation: osbFadeUp 0.9s ease forwards 0.4s;
}

.osb-hero__sub {
  font-family: var(--osb-font-body);
  font-size: clamp(16px, 1.3vw, 19px);
  font-weight: 400;
  line-height: 1.7;
  color: var(--osb-silver);
  max-width: 560px;
  margin-bottom: 40px;
  opacity: 0;
  transform: translateY(24px);
  animation: osbFadeUp 0.9s ease forwards 0.6s;
}

.osb-hero__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(20px);
  animation: osbFadeUp 0.8s ease forwards 0.8s;
}

.osb-hero__btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  font-family: var(--osb-font-heading);
  font-size: 13px; font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border: none;
  transition: background 0.3s ease, color 0.3s ease, transform 0.2s ease, border-color 0.3s ease;
  white-space: nowrap;
}

.osb-hero__btn--primary {
  background: var(--osb-brass);
  color: var(--osb-charcoal);
}

.osb-hero__btn--primary:hover {
  background: var(--osb-brass-hover);
  transform: translateY(-2px);
}

.osb-hero__btn--secondary {
  background: transparent;
  color: var(--osb-silver-light);
  border: 1px solid rgba(197, 198, 200, 0.25);
}

.osb-hero__btn--secondary:hover {
  border-color: var(--osb-brass);
  color: var(--osb-brass);
  transform: translateY(-2px);
}

.osb-hero__btn-arrow {
  width: 14px; height: 14px;
  stroke: currentColor; stroke-width: 2; fill: none;
  transition: transform 0.3s ease;
}

.osb-hero__btn:hover .osb-hero__btn-arrow {
  transform: translateX(3px);
}

/* Scroll Indicator */
.osb-hero__scroll {
  position: absolute;
  bottom: 28px; right: 48px;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  animation: osbFadeUp 0.6s ease forwards 1s;
}

.osb-hero__scroll-text {
  font-family: var(--osb-font-heading);
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--osb-concrete);
  writing-mode: vertical-rl;
}

.osb-hero__scroll-line {
  width: 1px; height: 48px;
  background: linear-gradient(180deg, var(--osb-brass), transparent);
  position: relative;
  overflow: hidden;
}

.osb-hero__scroll-line::after {
  content: '';
  position: absolute;
  top: -100%; left: 0; width: 100%; height: 100%;
  background: var(--osb-brass);
  animation: osbScrollPulse 2s ease-in-out infinite;
}

/* Animations */
@keyframes osbFadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes osbScrollPulse {
  0% { top: -100%; }
  50% { top: 100%; }
  100% { top: 100%; }
}

/* Responsive */
@media (max-width: 1024px) {
  .osb-hero__inner { padding-bottom: 48px; }
  .osb-hero__content { padding: 0 32px; }
  .osb-hero__scroll { display: none; }
}

@media (max-width: 768px) {
  .osb-hero { height: 100vh; height: 100dvh; margin-top: -74px; }
  .osb-hero__inner { padding-top: 74px; padding-bottom: 40px; }
  .osb-hero__content { padding: 0 20px; }
  .osb-hero__heading { max-width: 100%; }
  .osb-hero__sub { max-width: 100%; margin-bottom: 32px; }
  .osb-hero__actions { flex-direction: column; align-items: stretch; gap: 12px; }
  .osb-hero__btn { justify-content: center; padding: 16px 28px; }
}

@media (min-width: 1600px) {
  .osb-hero__content { max-width: var(--osb-container-wide); padding: 0 60px; }
  .osb-hero__inner { padding-bottom: 72px; }
}
/* ══════════════════════════════════
   HOMEPAGE ABOUT SECTION
   ══════════════════════════════════ */

.osb-about {
  position: relative;
  background: var(--osb-off-white);
  overflow: hidden;
}

.osb-about__split {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  min-height: 700px;
}

/* Image Column */
.osb-about__image-col {
  position: relative;
  background: var(--osb-charcoal);
  overflow: hidden;
}

.osb-about__image-col img {
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scale(1.05);
  transition: opacity 1s ease, transform 1.2s ease;
}

.osb-about__image-col.is-visible img {
  opacity: 1;
  transform: scale(1);
}

.osb-about__image-overlay {
  position: absolute;
  bottom: 0; left: 0; width: 100%; height: 40%;
  background: linear-gradient(180deg, transparent 0%, rgba(17, 17, 17, 0.5) 100%);
  z-index: 2;
  pointer-events: none;
}

/* Floating Stat Box */
.osb-about__stat-box {
  position: absolute;
  bottom: 40px; right: -60px;
  z-index: 5;
  background: var(--osb-charcoal);
  border: 1px solid var(--osb-border);
  padding: 36px 40px;
  min-width: 260px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease 0.4s, transform 0.8s ease 0.4s;
}

.osb-about__image-col.is-visible .osb-about__stat-box {
  opacity: 1;
  transform: translateY(0);
}

.osb-about__stat-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 2px;
  background: var(--osb-brass);
}

.osb-about__stat-number {
  font-family: var(--osb-font-heading);
  font-size: 52px; font-weight: 700;
  color: var(--osb-brass);
  line-height: 1; letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.osb-about__stat-label {
  font-family: var(--osb-font-heading);
  font-size: 13px; font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--osb-silver);
  line-height: 1.5;
}

/* Text Column */
.osb-about__text-col {
  display: flex;
  align-items: center;
  padding: 80px 64px 80px 100px;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease 0.2s, transform 0.8s ease 0.2s;
}

.osb-about__text-col.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.osb-about__text {
  max-width: 520px;
}

.osb-about__label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.osb-about__label-line {
  width: 32px; height: 1px;
  background: var(--osb-brass);
}

.osb-about__label-text {
  font-family: var(--osb-font-heading);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--osb-brass);
}

.osb-about__heading {
  font-family: var(--osb-font-heading);
  font-size: clamp(28px, 2.8vw, 42px);
  font-weight: 700;
  line-height: 1.15; letter-spacing: -0.02em;
  color: var(--osb-charcoal);
  margin-bottom: 28px;
}

.osb-about__body {
  font-family: var(--osb-font-body);
  font-size: 16px; line-height: 1.8;
  color: var(--osb-concrete);
  margin-bottom: 20px;
}

.osb-about__body:last-of-type {
  margin-bottom: 36px;
}

.osb-about__divider {
  width: 48px; height: 1px;
  background: var(--osb-brass);
  opacity: 0.4;
  margin-bottom: 36px;
}

.osb-about__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--osb-font-heading);
  font-size: 13px; font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--osb-charcoal);
  padding: 14px 32px;
  border: 1px solid rgba(17, 17, 17, 0.2);
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.2s ease;
}

.osb-about__link:hover {
  background: var(--osb-brass);
  color: var(--osb-charcoal);
  border-color: var(--osb-brass);
  transform: translateY(-2px);
}

.osb-about__link-arrow {
  width: 14px; height: 14px;
  stroke: currentColor; stroke-width: 2; fill: none;
  transition: transform 0.3s ease;
}

.osb-about__link:hover .osb-about__link-arrow {
  transform: translateX(4px);
}

/* Responsive */
@media (max-width: 1024px) {
  .osb-about__split { grid-template-columns: 1fr 1fr; min-height: 600px; }
  .osb-about__text-col { padding: 56px 40px 56px 56px; }
  .osb-about__stat-box { right: -40px; padding: 28px 32px; min-width: 220px; }
  .osb-about__stat-number { font-size: 42px; }
}

@media (max-width: 768px) {
  .osb-about__split { grid-template-columns: 1fr; min-height: auto; }
  .osb-about__image-col { height: 400px; }
  .osb-about__stat-box { right: 20px; bottom: 20px; min-width: 180px; padding: 24px 28px; }
  .osb-about__stat-number { font-size: 36px; }
  .osb-about__stat-label { font-size: 11px; }
  .osb-about__text-col { padding: 48px 20px 56px; }
  .osb-about__text { max-width: 100%; }
}

@media (min-width: 1600px) {
  .osb-about__split { min-height: 760px; }
  .osb-about__text-col { padding: 96px 80px 96px 120px; }
  .osb-about__text { max-width: 560px; }
  .osb-about__stat-box { right: -72px; bottom: 56px; padding: 40px 48px; }
}
/* ══════════════════════════════════
   HOMEPAGE SERVICES SECTION
   ══════════════════════════════════ */

.osb-services {
  background: var(--osb-graphite);
  padding: 120px 0;
  overflow: hidden;
}

.osb-services__container {
  max-width: var(--osb-container-max);
  margin: 0 auto;
  padding: 0 48px;
}

.osb-services__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 64px;
  gap: 40px;
}

.osb-services__label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.osb-services__label-line { width: 32px; height: 1px; background: var(--osb-brass); }

.osb-services__label-text {
  font-family: var(--osb-font-heading);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--osb-brass);
}

.osb-services__heading {
  font-family: var(--osb-font-heading);
  font-size: clamp(30px, 3.2vw, 46px);
  font-weight: 700; line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--osb-off-white);
}

.osb-services__intro {
  font-family: var(--osb-font-body);
  font-size: 16px; line-height: 1.7;
  color: var(--osb-concrete-light);
  max-width: 420px;
  text-align: right;
  flex-shrink: 0;
}

.osb-services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.osb-services__card {
  position: relative;
  background: var(--osb-charcoal);
  border: 1px solid var(--osb-border);
  border-top: 2px solid var(--osb-brass);
  padding: 44px 36px 40px;
  display: flex;
  flex-direction: column;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  cursor: pointer;
}

.osb-services__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
  border-color: rgba(179, 155, 106, 0.3);
}

.osb-services__icon {
  width: 44px; height: 44px;
  margin-bottom: 28px;
  stroke: var(--osb-brass);
  stroke-width: 1.5; fill: none;
  flex-shrink: 0;
}

.osb-services__card-title {
  font-family: var(--osb-font-heading);
  font-size: 20px; font-weight: 600;
  color: var(--osb-off-white);
  margin-bottom: 16px;
  letter-spacing: -0.01em; line-height: 1.3;
}

.osb-services__card-desc {
  font-family: var(--osb-font-body);
  font-size: 15px; line-height: 1.7;
  color: var(--osb-concrete-light);
  margin-bottom: 28px;
  flex-grow: 1;
}

.osb-services__card-link {
  display: inline-flex;
  align-items: center; gap: 8px;
  font-family: var(--osb-font-heading);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--osb-brass);
  transition: color 0.25s ease;
}

.osb-services__card:hover .osb-services__card-link { color: var(--osb-brass-hover); }

.osb-services__card-link-arrow {
  width: 12px; height: 12px;
  stroke: currentColor; stroke-width: 2; fill: none;
  transition: transform 0.3s ease;
}

.osb-services__card:hover .osb-services__card-link-arrow { transform: translateX(3px); }

.osb-services__grid-bottom {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
  max-width: calc(66.666% - 8px);
  margin-left: auto;
  margin-right: auto;
}

@media (max-width: 1024px) {
  .osb-services { padding: 88px 0; }
  .osb-services__container { padding: 0 32px; }
  .osb-services__grid { grid-template-columns: repeat(2, 1fr); }
  .osb-services__grid-bottom { max-width: 100%; grid-template-columns: repeat(2, 1fr); }
  .osb-services__header { flex-direction: column; align-items: flex-start; }
  .osb-services__intro { text-align: left; max-width: 560px; }
}

@media (max-width: 640px) {
  .osb-services { padding: 64px 0; }
  .osb-services__container { padding: 0 20px; }
  .osb-services__grid { grid-template-columns: 1fr; }
  .osb-services__grid-bottom { grid-template-columns: 1fr; max-width: 100%; }
  .osb-services__card { padding: 36px 28px 32px; }
  .osb-services__header { margin-bottom: 44px; }
}

@media (min-width: 1600px) {
  .osb-services__container { max-width: var(--osb-container-wide); padding: 0 60px; }
}
/* ══════════════════════════════════
   HOMEPAGE WHY CHOOSE US SECTION
   ══════════════════════════════════ */

.osb-why {
  background: var(--osb-off-white);
  padding: 120px 0;
  overflow: hidden;
}

.osb-why__container {
  max-width: var(--osb-container-max);
  margin: 0 auto;
  padding: 0 48px;
}

.osb-why__header {
  max-width: 640px;
  margin-bottom: 72px;
}

.osb-why__label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.osb-why__label-line { width: 32px; height: 1px; background: var(--osb-brass); }

.osb-why__label-text {
  font-family: var(--osb-font-heading);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--osb-brass);
}

.osb-why__heading {
  font-family: var(--osb-font-heading);
  font-size: clamp(30px, 3.2vw, 46px);
  font-weight: 700; line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--osb-charcoal);
  margin-bottom: 20px;
}

.osb-why__intro {
  font-family: var(--osb-font-body);
  font-size: 16px; line-height: 1.8;
  color: var(--osb-concrete);
}

.osb-why__pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.osb-why__pillar {
  position: relative;
  padding-top: 32px;
  border-top: 1px solid rgba(17, 17, 17, 0.1);
}

.osb-why__pillar::before {
  content: '';
  position: absolute;
  top: -1px; left: 0;
  width: 48px; height: 2px;
  background: var(--osb-brass);
}

.osb-why__pillar-number {
  font-family: var(--osb-font-heading);
  font-size: 48px; font-weight: 700;
  color: rgba(179, 155, 106, 0.15);
  line-height: 1; margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.osb-why__pillar-title {
  font-family: var(--osb-font-heading);
  font-size: 22px; font-weight: 600;
  color: var(--osb-charcoal);
  margin-bottom: 16px;
  line-height: 1.3; letter-spacing: -0.01em;
}

.osb-why__pillar-desc {
  font-family: var(--osb-font-body);
  font-size: 15px; line-height: 1.75;
  color: var(--osb-concrete);
}

@media (max-width: 1024px) {
  .osb-why { padding: 88px 0; }
  .osb-why__container { padding: 0 32px; }
  .osb-why__pillars { gap: 40px; }
  .osb-why__header { margin-bottom: 56px; }
}

@media (max-width: 768px) {
  .osb-why { padding: 64px 0; }
  .osb-why__container { padding: 0 20px; }
  .osb-why__pillars { grid-template-columns: 1fr; gap: 36px; }
  .osb-why__header { margin-bottom: 44px; }
}

@media (min-width: 1600px) {
  .osb-why__container { max-width: var(--osb-container-wide); padding: 0 60px; }
}
/* ══════════════════════════════════
   CTA BANNER SECTION
   ══════════════════════════════════ */

.osb-cta {
  position: relative;
  background: var(--osb-charcoal);
  padding: 120px 0;
  overflow: hidden;
}

.osb-cta__bg {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  opacity: 0.06;
  background-image:
    linear-gradient(135deg, rgba(179, 155, 106, 0.3) 1px, transparent 1px),
    linear-gradient(225deg, rgba(179, 155, 106, 0.3) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.osb-cta__accent {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--osb-brass) 50%, transparent 100%);
}

.osb-cta__container {
  position: relative; z-index: 2;
  max-width: var(--osb-container-max);
  margin: 0 auto; padding: 0 48px;
  text-align: center;
}

.osb-cta__content {
  max-width: 680px;
  margin: 0 auto;
}

.osb-cta__label {
  display: inline-flex;
  align-items: center; gap: 12px;
  margin-bottom: 24px;
  justify-content: center;
}

.osb-cta__label-line { width: 32px; height: 1px; background: var(--osb-brass); }

.osb-cta__label-text {
  font-family: var(--osb-font-heading);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--osb-brass);
}

.osb-cta__heading {
  font-family: var(--osb-font-heading);
  font-size: clamp(30px, 3.5vw, 50px);
  font-weight: 700; line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--osb-off-white);
  margin-bottom: 20px;
}

.osb-cta__sub {
  font-family: var(--osb-font-body);
  font-size: 17px; line-height: 1.7;
  color: var(--osb-silver);
  margin-bottom: 40px;
}

.osb-cta__btn {
  display: inline-flex;
  align-items: center; gap: 10px;
  padding: 18px 44px;
  font-family: var(--osb-font-heading);
  font-size: 14px; font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--osb-charcoal);
  background: var(--osb-brass);
  border: none; cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
}

.osb-cta__btn:hover {
  background: var(--osb-brass-hover);
  transform: translateY(-2px);
}

.osb-cta__btn-arrow {
  width: 14px; height: 14px;
  stroke: currentColor; stroke-width: 2; fill: none;
  transition: transform 0.3s ease;
}

.osb-cta__btn:hover .osb-cta__btn-arrow { transform: translateX(3px); }

@media (max-width: 1024px) {
  .osb-cta { padding: 88px 0; }
  .osb-cta__container { padding: 0 32px; }
}

@media (max-width: 640px) {
  .osb-cta { padding: 64px 0; }
  .osb-cta__container { padding: 0 20px; }
  .osb-cta__btn { width: 100%; justify-content: center; padding: 16px 28px; }
}

@media (min-width: 1600px) {
  .osb-cta__container { max-width: var(--osb-container-wide); padding: 0 60px; }
}

/* ══════════════════════════════════
   SCROLL ANIMATIONS
   ══════════════════════════════════ */

.osb-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.osb-reveal.is-visible {
  opacity: 1;
  transform: translate(0);
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap; border-width: 0;
}