/* ═══════════════════════════════════════════════════
JAYASOM TABBER MODULE
═══════════════════════════════════════════════════ */
.tabber {
  position: relative;
  width: 100%;
  height: 620px;
  overflow: hidden;
}

.tabber__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center 30%;
}

.tabber__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.22);
}

.tabber__inner {
  position: relative;
  z-index: 2;
  height: 100%;
  max-width: var(--max, 1450px);
  margin: 0 auto;
  padding: 0 54px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-top: 108px;
}

/* ── Left ── */
.tabber__left {
  width: 460px;
  color: var(--white, #ffffff);
  transition: opacity .35s ease, transform .35s ease;
}

.tabber__eyebrow {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  line-height: 23px;
  margin-bottom: 28px;
  opacity: .85;
}

.tabber__heading {
  font-size: 44px;
  font-weight: 200;
  letter-spacing: 4px;
  text-transform: uppercase;
  line-height: 1.12;
  margin-bottom: 28px;
  color:#fff;
}
.tab.--active {
  border-bottom-color: #fff;
}
.tabber__body {
  font-size: 13.5px;
  font-weight: 300;
  letter-spacing: .9px;
  line-height: 28px;
  max-width: 401px;
  opacity: .82;
}

/* fade-in animation triggered by JS */
.tabber__left.--fade {
  opacity: 0;
  transform: translateY(10px);
}

.tabber__right {
  padding-top: 0;
  width: 521px;
  display: flex;
  flex-direction: column;
  min-height: 420px;
  justify-content: space-evenly;
}

.tab {
  cursor: pointer;
  padding: 26px 0;
  border-bottom: 1px solid rgba(255,255,255,0.28);
  outline: none;
}
.tab:first-child { padding-top: 0; }

.tab__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tab__title {
  font-size: 24px;
  font-weight: 200;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: rgba(255,255,255,.45);
  transition: color .3s ease;
  user-select: none;
}

.tab__arrow {
  color: rgba(255,255,255,0);
  font-size: 20px;
  font-weight: 200;
  line-height: 1;
  transition: color .3s ease, transform .3s ease;
  transform: translateX(-6px);
}
/* active / hover states */
.tab:hover .tab__title,
.tab.--active .tab__title {
  color: var(--white, #ffffff);
}

.tab:hover .tab__arrow,
.tab.--active .tab__arrow {
  color: rgba(255,255,255,.7);
  transform: translateX(0);
}

.tab.--active .tab__bar {
  width: 42px;
}

Here's the CSS with responsive breakpoints added:
css/* ═══════════════════════════════════════════════════
JAYASOM TABBER MODULE
═══════════════════════════════════════════════════ */
.tabber {
  position: relative;
  width: 100%;
  height: 620px;
  overflow: hidden;
}
.tabber__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center 30%;
}
.tabber__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.22);
}
.tabber__inner {
  position: relative;
  z-index: 2;
  height: 100%;
  max-width: var(--max, 1450px);
  margin: 0 auto;
  padding: 0 54px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-top: 108px;
}
/* ── Left ── */
.tabber__left {
  width: 460px;
  color: var(--white, #ffffff);
  transition: opacity .35s ease, transform .35s ease;
}
.tabber__eyebrow {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  line-height: 23px;
  margin-bottom: 28px;
  opacity: .85;
}
.tabber__heading {
  font-size: 44px;
  font-weight: 200;
  letter-spacing: 4px;
  text-transform: uppercase;
  line-height: 1.12;
  margin-bottom: 28px;
  color: #fff;
}
.tab.--active {
  border-bottom-color: #fff;
}
.tabber__body {
  font-size: 13.5px;
  font-weight: 300;
  letter-spacing: .9px;
  line-height: 28px;
  max-width: 401px;
  opacity: .82;
}
/* fade-in animation triggered by JS */
.tabber__left.--fade {
  opacity: 0;
  transform: translateY(10px);
}
.tabber__right {
  padding-top: 0;
  width: 521px;
  display: flex;
  flex-direction: column;
  min-height: 420px;
  justify-content: space-evenly;
}
.tab {
  cursor: pointer;
  padding: 26px 0;
  border-bottom: 1px solid rgba(255,255,255,0.28);
  outline: none;
}
.tab:first-child { padding-top: 0; }
.tab__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.tab__title {
  font-size: 24px;
  font-weight: 200;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: rgba(255,255,255,.45);
  transition: color .3s ease;
  user-select: none;
}
.tab__arrow {
  color: rgba(255,255,255,0);
  font-size: 20px;
  font-weight: 200;
  line-height: 1;
  transition: color .3s ease, transform .3s ease;
  transform: translateX(-6px);
}
/* active / hover states */
.tab:hover .tab__title,
.tab.--active .tab__title {
  color: var(--white, #ffffff);
}
.tab:hover .tab__arrow,
.tab.--active .tab__arrow {
  color: rgba(255,255,255,.7);
  transform: translateX(0);
}
.tab.--active .tab__bar {
  width: 42px;
}

/* ── Tablet (max 1024px) ── */
@media (max-width: 1180px) {
  .tabber {
    height: auto;
    min-height: 620px;
  }
  .tabber__inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 72px 32px 60px;
    gap: 48px;
  }
  .tabber__left {
    width: 100%;
    max-width: 560px;
  }
  .tabber__heading {
    font-size: 36px;
    letter-spacing: 3px;
  }
  .tabber__body {
    max-width: 100%;
  }
  .tabber__right {
    width: 100%;
    min-height: unset;
  }
  .tab__title {
    font-size: 20px;
    letter-spacing: 2.5px;
  }
}

/* ── Mobile (max 767px) ── */
@media (max-width: 767px) {
  .tabber {
    min-height: unset;
    height: auto;
  }
  .tabber__inner {
    flex-direction: column;
    padding: 50px 20px 48px;
    gap: 36px;
  }
  .tabber__left {
    width: 100%;
  }
  .tabber__eyebrow {
    font-size: 11px;
    letter-spacing: 2.5px;
    margin-bottom: 18px;
  }
  .tabber__heading {
    font-size: 26px;
    letter-spacing: 2.5px;
    margin-bottom: 18px;
  }
  .tabber__body {
    font-size: 13px;
    line-height: 25px;
    max-width: 100%;
  }
  .tabber__right {
    width: 100%;
    min-height: unset;
  }
  .tab {
    padding: 18px 0;
  }
  .tab__title {
    font-size: 16px;
    letter-spacing: 2px;
  }
  .tab__arrow {
    font-size: 16px;
  }
}