/* ============================================================
   DESIGN SYSTEM — Lakshmidaran M · VP Product Design Portfolio
   ============================================================ */

/* --- Tokens ------------------------------------------------- */
:root {
  /* Color */
  --bg:           #F8F8F7;
  --bg-card:      #FFFFFF;
  --bg-dark:      #0A0A0A;
  --ink-primary:  #0A0A0A;
  --ink-secondary:#555555;
  --ink-muted:    #767676; /* WCAG AA 4.6:1 on #F8F8F7 */
  --ink-invert:   #FFFFFF;
  --accent:       #0057FF;
  --accent-soft:  #E8F0FF;
  --border:       #E6E4DF;
  --border-dark:  #1E1E1E;

  /* Elevation */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.10);

  /* Radius */
  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 40px;
  --r-full: 999px;

  /* Spacing scale (8-pt) */
  --sp-1: 4px;   --sp-2: 8px;   --sp-3: 12px;  --sp-4: 16px;
  --sp-5: 20px;  --sp-6: 24px;  --sp-8: 32px;  --sp-10: 40px;
  --sp-12: 48px; --sp-16: 64px; --sp-20: 80px; --sp-24: 96px;

  /* Typography */
  --font-sans:   'Inter', system-ui, -apple-system, sans-serif;
  --font-serif:  'DM Serif Display', Georgia, serif;

  --text-xs:   .75rem;   /* 12 */
  --text-sm:   .875rem;  /* 14 */
  --text-base: 1rem;     /* 16 */
  --text-lg:   1.125rem; /* 18 */
  --text-xl:   1.25rem;  /* 20 */
  --text-2xl:  1.5rem;   /* 24 */
  --text-3xl:  2rem;     /* 32 */
  --text-4xl:  2.75rem;  /* 44 */
  --text-5xl:  3.75rem;  /* 60 */
  --text-6xl:  5rem;     /* 80 */

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in:  cubic-bezier(0.55, 0, 1, 0.45);
  --dur-fast: 180ms;
  --dur-base: 300ms;
  --dur-slow: 600ms;
}

/* --- Reset -------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  overflow-x: hidden;
}
img, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

/* --- Layout ------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--sp-8);
}
.container--wide  { max-width: 1440px; }
.container--narrow{ max-width: 800px; }

/* --- Skip Link (Accessibility) ----------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--sp-4);
  z-index: 9999;
  background: var(--ink-primary);
  color: var(--ink-invert);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--r-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--dur-fast);
}
.skip-link:focus {
  top: var(--sp-4);
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* --- Global Focus Styles (WCAG 2.4.7) ---------------------- */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}
.btn:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
.card:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-lg);
}

/* --- Navigation -------------------------------------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding-block: var(--sp-5);
  isolation: isolate; /* prevent cursor mix-blend-mode from affecting nav text */
  transition: background var(--dur-base) var(--ease-out),
              backdrop-filter var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}
.nav.scrolled {
  background: rgba(249,248,246,.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-primary);
}
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}
.nav__link {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  font-weight: 500;
  letter-spacing: .01em;
  position: relative;
  transition: color var(--dur-fast);
  padding-block: var(--sp-2); /* increase touch target */
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.nav__link:hover { color: var(--ink-primary); }
.nav__link:hover::after { transform: scaleX(1); }

/* --- Nav on dark-hero pages (case study, cs-hero background) */
body.dark-hero .nav:not(.scrolled) .nav__logo,
body.dark-hero .nav:not(.scrolled) .nav__link {
  color: rgba(255,255,255,.65);
}
body.dark-hero .nav:not(.scrolled) .nav__link:hover {
  color: #fff;
}
body.dark-hero .nav:not(.scrolled) .nav__cta {
  background: rgba(255,255,255,.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,.25);
}
body.dark-hero .nav:not(.scrolled) .nav__cta:hover {
  background: rgba(255,255,255,.25);
}
.nav__cta {
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--sp-2) var(--sp-5);
  background: var(--ink-primary);
  color: var(--ink-invert);
  border-radius: var(--r-full);
  letter-spacing: .02em;
  transition: background var(--dur-fast), transform var(--dur-fast);
}
.nav__cta:hover {
  background: #2A2A2A;
  transform: translateY(-1px);
}
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--sp-2);
}
.nav__burger span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--ink-primary);
  transition: transform var(--dur-base);
}

/* --- Hero --------------------------------------------------- */
.hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-bottom: var(--sp-16);
  padding-top: 100px;
  position: relative;
  overflow: hidden;
}

/* Two-column split */
.hero__split {
  display: grid;
  grid-template-columns: 1fr min(360px, 38%);
  gap: var(--sp-10);
  align-items: center;
  min-height: calc(100dvh - 180px);
}
.hero__left {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Right portrait column */
.hero__right {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-5);
  position: relative;
}
.hero__portrait {
  width: 100%;
  aspect-ratio: 3/4;
  border-radius: var(--r-xl);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}
.hero__portrait::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--r-xl);
  background: linear-gradient(to top, rgba(10,10,10,.18) 0%, transparent 50%);
  pointer-events: none;
}
.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 18%;
  transition: transform var(--dur-slow) var(--ease-out);
}
.hero__right:hover .hero__portrait img {
  transform: scale(1.03);
}
.hero__portrait-caption {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.hero__portrait-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink-primary);
  letter-spacing: .01em;
}
.hero__portrait-role {
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.hero__bg-text {
  position: absolute;
  top: 35%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-serif);
  font-size: clamp(60px, 11vw, 180px);
  color: rgba(10,10,10,.025);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  letter-spacing: -.02em;
}
.hero__label {
  display: inline-flex;
  align-items: flex-start;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: var(--sp-6);
  flex-wrap: wrap;
  max-width: 600px;
}
.hero__label::before {
  content: '';
  display: block;
  width: 20px; height: 1px;
  background: var(--ink-muted);
}
.hero__headline {
  font-family: var(--font-serif);
  font-size: clamp(var(--text-3xl), 4.5vw, var(--text-5xl));
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--ink-primary);
  max-width: 640px;
  margin-bottom: var(--sp-6);
  margin-top: var(--sp-4);
}
.hero__headline em {
  font-style: italic;
  color: var(--ink-secondary);
}
.hero__sub {
  font-size: var(--text-lg);
  color: var(--ink-secondary);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: var(--sp-10);
}
.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.hero__stats {
  margin-top: var(--sp-10);
  display: flex;
  gap: var(--sp-10);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.hero__stat-value {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  line-height: 1.1;
  letter-spacing: -.02em;
}
.hero__stat-label {
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-top: var(--sp-1);
}
.hero__scroll {
  position: absolute;
  bottom: var(--sp-8);
  right: var(--sp-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: var(--border);
  position: relative;
  overflow: hidden;
}
.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0; right: 0;
  height: 100%;
  background: var(--ink-muted);
  animation: scroll-line 2s var(--ease-out) infinite;
}
@keyframes scroll-line {
  to { top: 100%; }
}

/* --- Buttons (Fitts's Law: ≥44px touch target) ------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .02em;
  padding: var(--sp-3) var(--sp-6);
  min-height: 44px;
  border-radius: var(--r-full);
  transition: all var(--dur-fast) var(--ease-out);
}
.btn--primary {
  background: var(--ink-primary);
  color: var(--ink-invert);
}
.btn--primary:hover {
  background: #2A2A2A;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn--ghost {
  background: transparent;
  color: var(--ink-primary);
  border: 1.5px solid var(--border);
}
.btn--ghost:hover {
  border-color: var(--ink-primary);
  background: var(--ink-primary);
  color: var(--ink-invert);
  transform: translateY(-2px);
}
.btn--accent {
  background: var(--accent);
  color: #fff;
}
.btn--accent:hover {
  background: #0F38E0;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(23,70,245,.25);
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* --- Section Headers --------------------------------------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: var(--sp-5);
}
.section-label::before {
  content: '';
  display: block;
  width: 20px; height: 1px;
  background: var(--ink-muted);
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--ink-primary);
}
.section-sub {
  font-size: var(--text-lg);
  color: var(--ink-secondary);
  line-height: 1.7;
  max-width: 540px;
  margin-top: var(--sp-4);
}

/* --- Work Section ------------------------------------------ */
.work { padding-block: var(--sp-24); }
.work__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--sp-16);
  gap: var(--sp-8);
}
.work__grid {
  display: grid;
  gap: var(--sp-4);
}
.work__grid--2col {
  grid-template-columns: 1fr 1fr;
}

/* --- Case Study Card --------------------------------------- */
.card {
  background: var(--bg-card);
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
  transition: transform var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              border-color var(--dur-base);
  cursor: pointer;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card--featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 480px;
}
.card__visual {
  position: relative;
  overflow: hidden;
  background: var(--bg);
  aspect-ratio: 16/9;
}
.card--featured .card__visual {
  aspect-ratio: auto;
  min-height: 100%;
}
.card__visual img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease-out);
}
.card:hover .card__visual img {
  transform: scale(1.04);
}
.card__visual-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-6xl);
  opacity: .15;
  transition: transform var(--dur-slow) var(--ease-out);
}
.card:hover .card__visual-placeholder {
  transform: scale(1.04);
}
.card__body {
  padding: var(--sp-8);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.card__meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}
.tag {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--r-full);
  background: var(--accent-soft);
  color: var(--accent);
}
.tag--dark {
  background: rgba(12,12,12,.06);
  color: var(--ink-secondary);
}
.card__title {
  font-family: var(--font-serif);
  font-size: clamp(var(--text-xl), 2.5vw, var(--text-3xl));
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--ink-primary);
  margin-bottom: var(--sp-3);
}
.card__desc {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  line-height: 1.65;
  margin-bottom: var(--sp-6);
}
.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}
.card__result {
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: .04em;
}
.card__result strong {
  font-size: var(--text-lg);
  font-family: var(--font-serif);
  color: var(--ink-primary);
  display: block;
  line-height: 1.2;
}
.card__arrow {
  width: 44px; height: 44px; /* Fitts's Law: min touch target */
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all var(--dur-fast);
  color: var(--ink-secondary);
}
.card:hover .card__arrow {
  background: var(--ink-primary);
  border-color: var(--ink-primary);
  color: #fff;
  transform: rotate(-45deg);
}

/* --- About Section ----------------------------------------- */
.about {
  padding-block: var(--sp-24);
  background: var(--bg-dark);
  color: var(--ink-invert);
}
.about .section-label { color: rgba(255,255,255,.35); }
.about .section-label::before { background: rgba(255,255,255,.35); }
.about .section-title { color: var(--ink-invert); }
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-16);
  align-items: center;
  margin-top: var(--sp-12);
}
.about__text p {
  font-size: var(--text-lg);
  color: rgba(255,255,255,.65);
  line-height: 1.75;
  margin-bottom: var(--sp-6);
}
.about__text p:last-child { margin-bottom: 0; }
.about__text strong { color: #fff; font-weight: 600; }
.about__side {}
.about__photo {
  width: 100%;
  aspect-ratio: 3/4;
  border-radius: var(--r-lg);
  background: #1A1A1A;
  overflow: hidden;
  margin-bottom: var(--sp-6);
  position: relative;
}
.about__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 18%;
}
.about__photo-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 80px;
  opacity: .2;
}
.about__skills {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
}
.about__skill {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: .04em;
  color: rgba(255,255,255,.4);
  border: 1px solid rgba(255,255,255,.1);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-sm);
  transition: all var(--dur-fast);
}
.about__skill:hover {
  color: rgba(255,255,255,.9);
  border-color: rgba(255,255,255,.25);
  background: rgba(255,255,255,.05);
}

/* --- Process Section --------------------------------------- */
.process { padding-block: var(--sp-24); }
.process__grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 0 var(--sp-2);
  margin-top: var(--sp-12);
  align-items: stretch;
}
.process__step {
  padding: var(--sp-8) var(--sp-6);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-card);
  position: relative;
  transition: all var(--dur-base) var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.process__step:hover {
  border-color: var(--ink-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}
.process__step-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-3);
}
.process__icon-wrap {
  width: 52px;
  height: 52px;
  background: var(--ink-primary);
  color: var(--ink-invert);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--dur-base), transform var(--dur-base);
}
.process__step:hover .process__icon-wrap {
  background: var(--accent);
  transform: scale(1.06);
}
.process__badge {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--ink-muted);
  font-style: italic;
  line-height: 1;
  padding-top: 2px;
}
.process__step-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--ink-primary);
  margin: 0;
  line-height: 1.3;
}
.process__step-text {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  line-height: 1.65;
  flex: 1;
  margin: 0;
}
.process__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: auto;
  padding-top: var(--sp-2);
}
.process__tag {
  font-size: 11px;
  font-weight: 500;
  color: var(--ink-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  padding: 3px 10px;
  letter-spacing: .01em;
  transition: all var(--dur-fast);
}
.process__step:hover .process__tag {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.process__arrow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 40px;
  color: var(--border);
  flex-shrink: 0;
  width: 28px;
}

/* --- Testimonials ------------------------------------------ */
.testimonials {
  padding-block: var(--sp-24);
  background: var(--accent-soft);
}
.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  margin-top: var(--sp-12);
}
.testimonial {
  background: #fff;
  border-radius: var(--r-md);
  padding: var(--sp-8);
  border: 1px solid rgba(23,70,245,.1);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base);
}
.testimonial:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.testimonial__quote {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--ink-secondary);
  margin-bottom: var(--sp-6);
  font-style: italic;
}
.testimonial__author {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.testimonial__avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--ink-secondary);
  flex-shrink: 0;
}
.testimonial__name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink-primary);
}
.testimonial__role {
  font-size: var(--text-xs);
  color: var(--ink-muted);
}

/* --- Brands/Logos ------------------------------------------ */
.brands {
  padding-block: var(--sp-16);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.brands__label {
  text-align: center;
  font-size: var(--text-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
  margin-bottom: var(--sp-8);
}
.brands__row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-12);
  flex-wrap: wrap;
}
.brand-logo {
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--ink-muted);
  opacity: .5;
  transition: opacity var(--dur-fast);
}
.brand-logo:hover { opacity: 1; }

/* --- Contact Section --------------------------------------- */
.contact {
  padding-block: var(--sp-24);
}
.contact__inner {
  background: var(--bg-dark);
  border-radius: var(--r-xl);
  padding: var(--sp-16);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-16);
  align-items: center;
}
.contact .section-label { color: rgba(255,255,255,.35); }
.contact .section-label::before { background: rgba(255,255,255,.35); }
.contact .section-title { color: #fff; }
.contact__sub {
  font-size: var(--text-base);
  color: rgba(255,255,255,.5);
  line-height: 1.7;
  margin-top: var(--sp-4);
  margin-bottom: var(--sp-8);
}
.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.contact__link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--text-sm);
  color: rgba(255,255,255,.5);
  padding: var(--sp-4);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-sm);
  transition: all var(--dur-fast);
}
.contact__link:hover {
  color: #fff;
  border-color: rgba(255,255,255,.3);
  background: rgba(255,255,255,.05);
}
.contact__link svg { width: 18px; height: 18px; opacity: .6; }
.contact__form { display: flex; flex-direction: column; gap: var(--sp-3); }
.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
.form-field label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: rgba(255,255,255,.35);
}
.form-field input,
.form-field textarea {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-sm);
  padding: var(--sp-3) var(--sp-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: #fff;
  outline: none;
  transition: border-color var(--dur-fast), background var(--dur-fast);
  resize: none;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: rgba(255,255,255,.25); }
.form-field input:focus,
.form-field textarea:focus {
  border-color: rgba(255,255,255,.35);
  background: rgba(255,255,255,.08);
}
.form-field textarea { height: 120px; }

/* --- Footer ------------------------------------------------- */
.footer {
  padding-block: var(--sp-8);
  border-top: 1px solid var(--border);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}
.footer__copy {
  font-size: var(--text-xs);
  color: var(--ink-muted);
}
.footer__links {
  display: flex;
  gap: var(--sp-6);
}
.footer__link {
  font-size: var(--text-xs);
  color: var(--ink-muted);
  transition: color var(--dur-fast);
}
.footer__link:hover { color: var(--ink-primary); }

/* --- Case Study Detail ------------------------------------- */
.cs-hero {
  padding-top: 120px;
  padding-bottom: var(--sp-16);
  background: var(--bg-dark);
  color: #fff;
}
.cs-hero__back {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-sm);
  color: rgba(255,255,255,.4);
  margin-bottom: var(--sp-8);
  transition: color var(--dur-fast);
}
.cs-hero__back:hover { color: rgba(255,255,255,.8); }
.cs-hero__label { color: rgba(255,255,255,.35); }
.cs-hero__label::before { background: rgba(255,255,255,.35); }
.cs-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(var(--text-3xl), 5vw, 72px);
  line-height: 1.05;
  letter-spacing: -.025em;
  color: #fff;
  max-width: 800px;
  margin-block: var(--sp-5) var(--sp-8);
}
.cs-hero__meta {
  display: flex;
  gap: var(--sp-8);
  padding-top: var(--sp-8);
  border-top: 1px solid rgba(255,255,255,.1);
  flex-wrap: wrap;
}
.cs-hero__meta-item {}
.cs-hero__meta-label {
  font-size: var(--text-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255,255,255,.35);
  margin-bottom: var(--sp-1);
}
.cs-hero__meta-value {
  font-size: var(--text-sm);
  font-weight: 600;
  color: rgba(255,255,255,.8);
}
.cs-cover {
  width: 100%;
  aspect-ratio: 16/7;
  overflow: hidden;
  position: relative;
}
.cs-cover img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.cs-cover-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
  opacity: .12;
  background: var(--bg-dark);
}
.cs-body { padding-block: var(--sp-16); }
.cs-content {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--sp-16);
  align-items: start;
}
.cs-sidebar {
  position: sticky;
  top: 100px;
}
.cs-toc {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.cs-toc__item {
  font-size: var(--text-sm);
  color: var(--ink-muted);
  padding: var(--sp-2) var(--sp-3);
  border-left: 2px solid var(--border);
  transition: all var(--dur-fast);
}
.cs-toc__item:hover,
.cs-toc__item.active {
  color: var(--ink-primary);
  border-left-color: var(--ink-primary);
  background: rgba(12,12,12,.03);
}
.cs-main section { margin-bottom: var(--sp-16); }
.cs-main h2 {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  letter-spacing: -.015em;
  line-height: 1.2;
  color: var(--ink-primary);
  margin-bottom: var(--sp-6);
}
.cs-main h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--ink-primary);
  margin-top: var(--sp-8);
  margin-bottom: var(--sp-3);
}
.cs-main p {
  font-size: var(--text-base);
  color: var(--ink-secondary);
  line-height: 1.75;
  margin-bottom: var(--sp-4);
}
.cs-main p:last-child { margin-bottom: 0; }
.cs-main strong { color: var(--ink-primary); font-weight: 600; }
.cs-callout {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: var(--sp-6) var(--sp-8);
  margin-block: var(--sp-8);
}
.cs-callout p {
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--accent);
  margin: 0;
  line-height: 1.6;
}
.cs-image {
  width: 100%;
  border-radius: var(--r-md);
  overflow: hidden;
  margin-block: var(--sp-8);
  background: var(--bg);
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
}
.cs-image-placeholder {
  font-size: 60px;
  opacity: .15;
}
.cs-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  margin-block: var(--sp-8);
}
.cs-metric {
  text-align: center;
  padding: var(--sp-6);
  background: var(--bg-card);
  border-radius: var(--r-md);
  border: 1px solid var(--border);
}
.cs-metric__value {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  color: var(--accent);
  line-height: 1;
  margin-bottom: var(--sp-2);
  letter-spacing: -.02em;
}
.cs-metric__label {
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.cs-next {
  background: var(--bg-dark);
  color: #fff;
  padding-block: var(--sp-16);
  text-align: center;
}
.cs-next__label { color: rgba(255,255,255,.35); justify-content: center; }
.cs-next__label::before { background: rgba(255,255,255,.35); }
.cs-next__title {
  font-family: var(--font-serif);
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  color: #fff;
  letter-spacing: -.02em;
  margin-block: var(--sp-4) var(--sp-8);
}

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

/* --- Scroll Animations ------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal-delay="1"] { transition-delay: 100ms; }
[data-reveal-delay="2"] { transition-delay: 200ms; }
[data-reveal-delay="3"] { transition-delay: 300ms; }
[data-reveal-delay="4"] { transition-delay: 400ms; }

/* --- Cursor ------------------------------------------------- */
.cursor {
  position: fixed;
  width: 8px; height: 8px;
  background: var(--ink-primary);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width var(--dur-fast), height var(--dur-fast),
              background var(--dur-fast), opacity var(--dur-fast);
}
.cursor.hovering {
  width: 40px; height: 40px;
  opacity: .15;
}

/* --- Responsive -------------------------------------------- */
@media (max-width: 1024px) {
  .process__grid { grid-template-columns: 1fr 1fr; }
  .process__arrow { display: none; }
  .testimonials__grid { grid-template-columns: repeat(2, 1fr); }
  .cs-content { grid-template-columns: 1fr; }
  .cs-sidebar { position: static; }
  .cs-toc { flex-direction: row; flex-wrap: wrap; }
}

@media (max-width: 768px) {
  :root { --sp-24: 64px; }
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .hero__stats { gap: var(--sp-8); flex-wrap: wrap; }
  .work__header { flex-direction: column; align-items: flex-start; }
  .work__grid--2col { grid-template-columns: 1fr; }
  .card--featured { grid-template-columns: 1fr; }
  .about__grid { grid-template-columns: 1fr; }
  .process__grid { grid-template-columns: 1fr; }
  .process__arrow { display: none; }
  .testimonials__grid { grid-template-columns: 1fr; }
  .contact__inner { grid-template-columns: 1fr; padding: var(--sp-8); }
  .cs-metrics { grid-template-columns: 1fr; }
  .hero__scroll { display: none; }
  .cursor { display: none; }
  .hero__split { grid-template-columns: 1fr; gap: var(--sp-8); }
  .hero__right { order: -1; max-width: 260px; margin: 0 auto; }
  .hero__portrait { aspect-ratio: 1/1; border-radius: var(--r-lg); }
  .more-work-grid { grid-template-columns: 1fr 1fr !important; }
}
@media (max-width: 480px) {
  .more-work-grid { grid-template-columns: 1fr !important; }
}

/* --- Mobile Nav -------------------------------------------- */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--bg-dark);
  z-index: 99;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}
.mobile-nav.open {
  opacity: 1;
  pointer-events: all;
}
.mobile-nav__link {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  color: #fff;
  letter-spacing: -.02em;
  transition: color var(--dur-fast);
}
.mobile-nav__link:hover { color: rgba(255,255,255,.5); }
.mobile-nav__close {
  position: absolute;
  top: var(--sp-6); right: var(--sp-8);
  font-size: var(--text-2xl);
  color: rgba(255,255,255,.4);
  transition: color var(--dur-fast);
}
.mobile-nav__close:hover { color: #fff; }