/* ============================================
   DH TECH — Main Stylesheet
   Light Premium Technology Studio Website
   ============================================ */

/* ============================================
   NAVBAR (LIGHT THEME)
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--navbar-height);
  background: var(--navbar-bg);
  border-bottom: 1px solid var(--navbar-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background 0.35s var(--primitive-ease-out),
              border-color 0.35s var(--primitive-ease-out),
              box-shadow 0.35s var(--primitive-ease-out);
}

.navbar.scrolled {
  background: var(--navbar-bg-scroll);
  border-bottom-color: var(--navbar-border-scroll);
  box-shadow: var(--navbar-shadow);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--section-padding-x);
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.navbar__logo-img {
  height: 52px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: filter var(--transition-normal), transform var(--transition-normal);
}

.navbar__logo:hover .navbar__logo-img {
  filter: drop-shadow(0 4px 14px rgba(37, 99, 235, 0.3));
  transform: scale(1.03);
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.navbar__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast);
  white-space: nowrap;
  position: relative;
  text-decoration: none;
}

/* Hover underline animation */
.navbar__link::after {
  content: '';
  position: absolute;
  bottom: 0px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transition: width 0.25s var(--primitive-ease-out),
              left 0.25s var(--primitive-ease-out);
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--color-primary);
}

.navbar__link:hover::after,
.navbar__link.active::after {
  width: calc(100% - 1.7rem);
  left: 0.85rem;
}

.navbar__cta {
  margin-left: var(--space-4);
}

.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.navbar__hamburger:hover {
  background: var(--primitive-slate-100);
}

.hamburger-line {
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all 0.3s var(--primitive-ease-out);
  transform-origin: center;
}

.navbar__hamburger.open .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translateY(7px);
}
.navbar__hamburger.open .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.navbar__hamburger.open .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translateY(-7px);
}

/* Mobile menu */
.navbar__mobile-menu {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6);
  z-index: var(--z-dropdown);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.3s var(--primitive-ease-out), transform 0.3s var(--primitive-ease-out);
  pointer-events: none;
  box-shadow: var(--shadow-lg);
}

.navbar__mobile-menu.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.navbar__mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
}

.navbar__mobile-link {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.navbar__mobile-link:hover,
.navbar__mobile-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ============================================
   HERO SECTION (LIGHT PREMIUM WITH BRAND ARTWORK)
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--navbar-height);
  overflow: hidden;
  background-color: #FFFFFF;
}

/* Multi-layer Background System */
.hero__bg-wrap {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

/* Layer 1: Brand Artwork Visual */
.hero__bg-art {
  position: absolute;
  inset: -24px;
  background-image: url('/images/background_DHTech.png');
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  opacity: 1;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.8s ease-out;
  will-change: transform;
}

/* Layer 2: Subtle Ambient Tech Grid */
.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.02) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 40%, black 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, black 40%, transparent 85%);
  pointer-events: none;
}

/* Layer 2: Gradient Overlay (Lightened to reveal Dai Noi Hue artwork) */
.hero__bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.42) 0%,
    rgba(255, 255, 255, 0.28) 42%,
    rgba(255, 255, 255, 0.08) 75%,
    rgba(255, 255, 255, 0.00) 100%
  ),
  radial-gradient(
    ellipse at 20% 45%,
    rgba(255, 255, 255, 0.32) 0%,
    transparent 65%
  );
  pointer-events: none;
}

/* Layer 3: Floating Ambient Light Orbs */
.hero__orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  will-change: transform;
}

.hero__orb--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.09) 0%, rgba(37, 99, 235, 0.015) 50%, transparent 70%);
  filter: blur(65px);
  top: -120px;
  right: -80px;
  animation: floatOrb 14s ease-in-out infinite;
}

.hero__orb--2 {
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, rgba(6, 182, 212, 0.015) 50%, transparent 70%);
  filter: blur(55px);
  bottom: 20px;
  left: -80px;
  animation: floatOrb 16s ease-in-out infinite reverse;
}

.hero__orb--3 {
  width: 440px;
  height: 440px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 65%);
  filter: blur(50px);
  top: 30%;
  right: 18%;
  animation: floatOrb 18s ease-in-out infinite;
}

/* Floating Tech Particles */
.hero__particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__particle {
  position: absolute;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.6);
  pointer-events: none;
  animation: floatParticle 14s ease-in-out infinite;
}

.hero__particle--1 { width: 5px; height: 5px; top: 24%; left: 16%; opacity: 0.28; animation-delay: 0s; }
.hero__particle--2 { width: 4px; height: 4px; top: 58%; left: 24%; opacity: 0.22; animation-delay: 2.5s; }
.hero__particle--3 { width: 6px; height: 6px; top: 32%; right: 28%; opacity: 0.35; animation-delay: 4.5s; }
.hero__particle--4 { width: 4px; height: 4px; top: 72%; right: 20%; opacity: 0.25; animation-delay: 6.5s; }
.hero__particle--5 { width: 5px; height: 5px; top: 16%; right: 12%; opacity: 0.32; animation-delay: 8.5s; }

@keyframes floatParticle {
  0%, 100% { transform: translateY(0) translateX(0); opacity: 0.2; }
  50% { transform: translateY(-22px) translateX(10px); opacity: 0.45; }
}

/* Seamless Section Transition Fade into Section 2 */
.hero__bottom-fade {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 150px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(248, 250, 252, 0.4) 40%,
    rgba(248, 250, 252, 0.85) 75%,
    #F8FAFC 100%
  );
  pointer-events: none;
  z-index: 2;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-25px, -20px) scale(1.06); }
}

.hero__inner {
  position: relative;
  z-index: var(--z-above);
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--section-padding-x);
  padding-block: var(--space-20);
}

.hero__content {
  max-width: 820px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.25rem);
  font-weight: 800;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.hero__title-brand {
  display: inline-block;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Special Headline Reveal */
.hero__tagline {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5.5vw, 4.75rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
}

.hero__tagline-line {
  display: block;
  overflow: hidden;
}

.hero__tagline-line span {
  display: inline-block;
}

.hero__desc {
  font-size: clamp(var(--text-base), 1.6vw, var(--text-xl));
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 620px;
  margin-bottom: var(--space-10);
}

.hero__cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Floating stats (Frosted Glassmorphism) */
.hero__stats {
  display: inline-flex;
  gap: var(--space-8);
  margin-top: var(--space-12);
  padding: var(--space-4) var(--space-8);
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: var(--radius-xl);
  box-shadow: 0 12px 30px -4px rgba(15, 23, 42, 0.06), 0 4px 6px -2px rgba(15, 23, 42, 0.02);
}

.hero__stat-number {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 3vw, var(--text-4xl));
  font-weight: 700;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  line-height: 1;
}

.hero__stat-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  animation: scrollBounce 2.5s ease-in-out infinite;
}

.hero__scroll-line {
  width: 1.5px;
  height: 44px;
  background: linear-gradient(to bottom, var(--color-primary), transparent);
}

.hero__scroll-text {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ============================================
   ABOUT SECTION (SECTION 2: VERY LIGHT GRAY)
   ============================================ */
.about {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.about__inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-16);
  align-items: center;
}

.about__title {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
}

.about__desc {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
}

.about__workflow {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: #FFFFFF;
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.workflow-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  position: relative;
  padding-bottom: var(--space-6);
}

.workflow-item:last-child {
  padding-bottom: 0;
}

.workflow-item:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 21px;
  top: 44px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, rgba(37, 99, 235, 0.25), rgba(37, 99, 235, 0.05));
}

.workflow-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
  border: 1px solid rgba(37, 99, 235, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.workflow-text strong {
  display: block;
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: var(--text-base);
  margin-bottom: 2px;
}

.workflow-text span {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   SERVICES SECTION (SECTION 3: WHITE)
   ============================================ */
.services {
  background: var(--color-bg);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.service-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 300ms var(--primitive-ease-out),
              box-shadow 300ms var(--primitive-ease-out),
              border-color 300ms var(--primitive-ease-out);
  cursor: default;
}

.service-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-brand-subtle);
  opacity: 0;
  transition: opacity 300ms var(--primitive-ease-out);
  pointer-events: none;
}

.service-card:hover {
  border-color: var(--color-border-active);
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.service-card:hover::after {
  opacity: 1;
}

.service-card:hover .icon-box {
  transform: scale(1.08) rotate(2deg);
  background: rgba(37, 99, 235, 0.12);
  border-color: var(--color-primary);
}

.service-card:hover .service-card__title {
  color: var(--color-primary);
}

.service-card__inner {
  position: relative;
  z-index: 1;
}

.service-card__icon {
  margin-bottom: var(--space-5);
}

.service-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
  line-height: var(--leading-snug);
  transition: color var(--transition-fast);
}

.service-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ============================================
   PROCESS SECTION (SECTION 4: VERY LIGHT GRAY)
   ============================================ */
.process {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.process__timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  position: relative;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  background: #FFFFFF;
  padding: var(--space-8) var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.process-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-active);
}

.process-step__number {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-primary-light);
  border: 1.5px solid rgba(37, 99, 235, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
  transition: all var(--transition-normal);
}

.process-step.visible .process-step__number {
  box-shadow: 0 0 16px rgba(37, 99, 235, 0.25);
}

.process-step__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.process-step__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ============================================
   PORTFOLIO SECTION (SECTION 5: WHITE)
   ============================================ */
.portfolio {
  background: var(--color-bg);
}

.portfolio__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.project-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 300ms var(--primitive-ease-out),
              box-shadow 300ms var(--primitive-ease-out),
              border-color 300ms var(--primitive-ease-out);
  display: block;
  text-decoration: none;
}

.project-card:hover {
  border-color: var(--color-border-active);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  transform: translateY(-5px);
}

.project-card__image-wrap {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--primitive-slate-100);
}

.project-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--primitive-ease-out);
}

.project-card:hover .project-card__image {
  transform: scale(1.04);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(15, 23, 42, 0.85) 0%,
    rgba(15, 23, 42, 0.35) 45%,
    transparent 100%
  );
  display: flex;
  align-items: flex-end;
  padding: var(--space-6);
  opacity: 0;
  transition: opacity 0.3s var(--primitive-ease-out);
}

.project-card:hover .project-card__overlay {
  opacity: 1;
}

.project-card__cta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: #FFFFFF;
  font-weight: 600;
  font-size: var(--text-sm);
  transform: translateY(6px);
  transition: transform 0.3s var(--primitive-ease-out);
}

.project-card:hover .project-card__cta {
  transform: translateY(0);
}

.project-card__arrow {
  width: 18px;
  height: 18px;
  transition: transform 0.3s var(--primitive-ease-out);
}

.project-card:hover .project-card__arrow {
  transform: translateX(4px);
}

.project-card__info {
  padding: var(--space-6);
}

.project-card__category {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  transition: color var(--transition-fast);
}

.project-card:hover .project-card__title {
  color: var(--color-primary);
}

.project-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ============================================
   MORE PROJECTS SECTION (SECTION 6: VERY LIGHT GRAY)
   ============================================ */
.more-projects {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.more-projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.experiment-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  cursor: pointer;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  display: block;
  text-decoration: none;
}

.experiment-card:hover {
  border-color: var(--color-border-active);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.experiment-card__image-wrap {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--primitive-slate-100);
}

.experiment-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--primitive-ease-out);
}

.experiment-card:hover .experiment-card__image {
  transform: scale(1.04);
}

.experiment-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.experiment-card:hover .experiment-card__overlay {
  opacity: 1;
}

.experiment-card__github-icon {
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  box-shadow: var(--shadow-md);
}

.experiment-card__info {
  padding: var(--space-5);
}

.experiment-card__category {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.experiment-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.experiment-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* Coming soon card */
.coming-soon-card {
  background: #FFFFFF;
  border: 1.5px dashed var(--primitive-slate-300);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 220px;
  padding: var(--space-8);
  gap: var(--space-3);
  transition: all var(--transition-normal);
}

.coming-soon-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-2px);
}

.coming-soon-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.coming-soon-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text-primary);
}

.coming-soon-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============================================
   WHY DH TECH (SECTION 7: WHITE)
   ============================================ */
.why {
  background: var(--color-bg);
}

.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.why-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.why-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.why-card:hover {
  border-color: var(--color-border-active);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.why-card:hover::before {
  opacity: 1;
}

.why-card__icon {
  margin-bottom: var(--space-5);
}

.why-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.why-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ============================================
   PRICING SECTION (SECTION 8: VERY LIGHT GRAY)
   ============================================ */
.pricing {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  align-items: stretch;
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-xs);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.pricing-card:hover {
  border-color: var(--color-border-active);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card--featured {
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: var(--shadow-glow), var(--shadow-md);
  background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
  transform: scale(1.02);
}

.pricing-card--featured:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: var(--shadow-glow-strong), var(--shadow-xl);
}

.pricing-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: var(--space-4);
  letter-spacing: 0.04em;
  align-self: flex-start;
}

.pricing-card__tier {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.pricing-card__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.pricing-card__price {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  line-height: 1.5;
}

.pricing-card__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
  flex-grow: 1;
}

.pricing-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.pricing-feature__icon {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ============================================
   CTA SECTION (SECTION 9: SUBTLE BRAND GRADIENT)
   ============================================ */
.cta-section {
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

.cta-section__box {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0FDFA 50%, #EFF6FF 100%);
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: var(--radius-2xl);
  padding: var(--space-16) var(--space-8);
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.cta-section__box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 250px;
  background: radial-gradient(ellipse, rgba(37, 99, 235, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section__inner {
  max-width: 640px;
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.cta-section__title {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 4.5vw, var(--text-5xl));
  font-weight: 800;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.cta-section__desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-10);
}

.cta-section__btns {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ============================================
   CONTACT SECTION (SECTION 10: VERY LIGHT GRAY)
   ============================================ */
.contact {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: var(--space-16);
  align-items: start;
}

.contact__info-title {
  font-family: var(--font-display);
  font-size: clamp(var(--text-2xl), 3vw, var(--text-4xl));
  font-weight: 800;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.contact__info-desc {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-10);
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: #FFFFFF;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.contact-detail:hover {
  transform: translateX(4px);
  border-color: var(--color-border-active);
}

.contact-detail__icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  border: 1px solid rgba(37, 99, 235, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-detail__label {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.contact-detail__value {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.contact-detail__value a {
  color: inherit;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.contact-detail__value a:hover {
  color: var(--color-primary);
}

.contact__socials {
  display: flex;
  gap: var(--space-3);
}

.social-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  text-decoration: none;
  box-shadow: var(--shadow-xs);
}

.social-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-border-active);
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* Contact Form Container (Pure White Light Premium Card) */
.contact-form {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-lg);
}

.contact-form__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.contact-form__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.contact-form__fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-submit-wrap {
  margin-top: var(--space-4);
}

.form-submit-wrap .btn {
  width: 100%;
}

/* Form status messages */
.form-message {
  display: none;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  margin-top: var(--space-4);
  line-height: 1.5;
}

.form-message.success {
  display: block;
  background: var(--color-success-bg);
  border: 1px solid rgba(22, 163, 74, 0.3);
  color: var(--color-success);
}

.form-message.error {
  display: block;
  background: var(--color-error-bg);
  border: 1px solid rgba(220, 38, 38, 0.3);
  color: var(--color-error);
}

/* ============================================
   FOOTER (LIGHT CLEAN STUDIO)
   ============================================ */
.footer {
  background: #0B1120;
  color: #F8FAFC;
  border-top: 1px solid rgba(37, 99, 235, 0.22);
  padding-block: var(--space-16);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 180px;
  background: radial-gradient(ellipse at 50% 0%, rgba(37, 99, 235, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
  position: relative;
  z-index: 1;
}

.footer__brand-logo {
  height: 52px;
  width: 52px;
  object-fit: contain;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3), 0 0 16px rgba(37, 99, 235, 0.2);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.footer__brand-logo:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.footer__brand-tagline {
  font-size: var(--text-sm);
  color: #94A3B8;
  margin-bottom: var(--space-6);
  line-height: var(--leading-relaxed);
}

.footer__socials {
  display: flex;
  gap: var(--space-2);
}

.footer .social-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #CBD5E1;
}

.footer .social-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.footer__col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: #FFFFFF;
  margin-bottom: var(--space-4);
}

.footer__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: #94A3B8;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer__link:hover {
  color: #38BDF8;
}

.footer__divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.08);
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 1;
}

.footer__copy {
  font-size: var(--text-xs);
  color: #64748B;
}

.footer__founder {
  font-size: var(--text-xs);
  color: #64748B;
}

.footer__founder a {
  color: #38BDF8;
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__founder a:hover {
  color: #67E8F9;
}

/* ============================================
   TOASTER / NOTIFICATION
   ============================================ */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toast {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  min-width: 320px;
  max-width: 420px;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  animation: slide-in-right 0.3s var(--primitive-ease-out);
}

.toast.success {
  border-left: 4px solid var(--color-success);
}

.toast.error {
  border-left: 4px solid var(--color-error);
}

.toast__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.toast.success .toast__icon { color: var(--color-success); }
.toast.error   .toast__icon { color: var(--color-error); }

.toast__text {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  flex: 1;
  line-height: 1.4;
}

@keyframes slide-in-right {
  from { transform: translateX(110%); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --section-padding-y: 5rem;
  }

  .about__inner {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }

  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .process__timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .why__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-inline: auto;
  }

  .pricing-card--featured {
    transform: none;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .more-projects__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact__inner {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding-y: 4rem;
    --section-padding-x: 1.25rem;
    --navbar-height: 66px;
  }

  /* Navbar mobile */
  .navbar__logo-img {
    height: 44px;
  }

  .navbar__nav,
  .navbar__cta {
    display: none;
  }

  .navbar__hamburger {
    display: flex;
  }

  .navbar__mobile-menu {
    display: block;
  }

  /* Hero Mobile Optimization */
  .hero__bg-art {
    background-position: 75% top;
    opacity: 0.92;
  }

  .hero__bg-overlay {
    background: linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.92) 0%,
      rgba(255, 255, 255, 0.84) 55%,
      rgba(255, 255, 255, 0.6) 100%
    );
  }

  .hero__particles {
    display: none;
  }

  .hero__stats {
    display: flex;
    flex-direction: column;
    width: 100%;
    padding: var(--space-5);
    gap: var(--space-4);
  }

  .hero__scroll {
    display: none;
  }

  /* Services */
  .services__grid {
    grid-template-columns: 1fr;
  }

  /* Process */
  .process__timeline {
    grid-template-columns: 1fr;
  }

  /* Portfolio */
  .portfolio__grid {
    grid-template-columns: 1fr;
  }

  /* More projects */
  .more-projects__grid {
    grid-template-columns: 1fr;
  }

  /* Why */
  .why__grid {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .form-grid-2 {
    grid-template-columns: 1fr;
  }

  .contact-form {
    padding: var(--space-6);
  }

  /* Footer */
  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --section-padding-x: 1rem;
  }

  .hero__cta {
    flex-direction: column;
    width: 100%;
  }

  .btn--lg {
    width: 100%;
    justify-content: center;
  }

  .cta-section__btns {
    flex-direction: column;
    width: 100%;
  }

  .cta-section__box {
    padding: var(--space-10) var(--space-4);
  }
}

/* ============================================
   REDUCED MOTION SUPPORT
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .hero__orb,
  .hero__scroll,
  .hero__particle,
  .glow-dot,
  .text-shimmer {
    animation: none !important;
  }

  .hero__bg-art {
    transform: none !important;
    transition: none !important;
  }
  
  .anim-fade-up,
  .anim-blur-up,
  .anim-fade-in {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
    transition: none !important;
  }

  .service-card:hover,
  .project-card:hover,
  .why-card:hover,
  .process-step:hover,
  .btn:hover {
    transform: none !important;
  }
}