/* =====================================================
   SHUNYA — Design System
   Zero friction. Infinite precision.
   ===================================================== */

/* --- Type Scale --- */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    7rem);
}

/* --- Spacing --- */
:root {
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
}

/* --- SHUNYA Color Palette ---
   Dark-first: deep obsidian surfaces, teal primary, amber accent
   Inspired by the existing aryanayyar.com palette but elevated
   into premium dark fintech territory
*/
:root, [data-theme="light"] {
  --color-bg:             #f5f4ef;
  --color-surface:        #f9f8f4;
  --color-surface-2:      #fefdf9;
  --color-surface-offset: #eeece6;
  --color-surface-offset-2: #e8e6df;
  --color-surface-dynamic: #e1dfd8;
  --color-divider:        #d8d6cf;
  --color-border:         #ccc9c1;

  --color-text:           #1a1814;
  --color-text-muted:     #6b6a66;
  --color-text-faint:     #b5b4af;
  --color-text-inverse:   #f5f4ef;

  /* Teal primary — matches aryanayyar.com links */
  --color-primary:        #00787f;
  --color-primary-hover:  #005c62;
  --color-primary-active: #003f44;
  --color-primary-highlight: #c5d8d9;

  /* Amber accent for CTAs */
  --color-accent:         #b85c00;
  --color-accent-hover:   #8f4500;
  --color-accent-active:  #682f00;
  --color-accent-highlight: #ead6c4;

  --color-gold:           #c9900a;
  --color-success:        #3d7a1c;
  --color-error:          #9a2870;

  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.625rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.05);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);
  --shadow-xl: 0 24px 64px oklch(0.2 0.01 80 / 0.16);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  --font-display: 'Instrument Serif', 'Georgia', serif;
  --font-body: 'Switzer', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

[data-theme="dark"] {
  --color-bg:             #0e0d0b;
  --color-surface:        #141210;
  --color-surface-2:      #181614;
  --color-surface-offset: #1a1815;
  --color-surface-offset-2: #1e1c18;
  --color-surface-dynamic: #272421;
  --color-divider:        #212019;
  --color-border:         #2e2c28;

  --color-text:           #dddbd7;
  --color-text-muted:     #7a7874;
  --color-text-faint:     #4e4c49;
  --color-text-inverse:   #0e0d0b;

  --color-primary:        #4fa8b0;
  --color-primary-hover:  #2e8c96;
  --color-primary-active: #1a6e77;
  --color-primary-highlight: #1c3337;

  --color-accent:         #e8a050;
  --color-accent-hover:   #f0bc78;
  --color-accent-active:  #f6ce9a;
  --color-accent-highlight: #3a2c1a;

  --color-gold:           #e8b040;
  --color-success:        #66a640;
  --color-error:          #cc60a0;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
  --shadow-xl: 0 24px 64px oklch(0 0 0 / 0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0e0d0b;
    --color-surface:        #141210;
    --color-surface-2:      #181614;
    --color-surface-offset: #1a1815;
    --color-surface-offset-2: #1e1c18;
    --color-surface-dynamic: #272421;
    --color-divider:        #212019;
    --color-border:         #2e2c28;
    --color-text:           #dddbd7;
    --color-text-muted:     #7a7874;
    --color-text-faint:     #4e4c49;
    --color-text-inverse:   #0e0d0b;
    --color-primary:        #4fa8b0;
    --color-primary-hover:  #2e8c96;
    --color-primary-active: #1a6e77;
    --color-primary-highlight: #1c3337;
    --color-accent:         #e8a050;
    --color-accent-hover:   #f0bc78;
    --color-accent-active:  #f6ce9a;
    --color-accent-highlight: #3a2c1a;
    --color-gold:           #e8b040;
    --color-success:        #66a640;
    --color-error:          #cc60a0;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
    --shadow-xl: 0 24px 64px oklch(0 0 0 / 0.55);
  }
}

/* =====================================================
   LAYOUT
   ===================================================== */

.container {
  width: min(var(--content-wide), calc(100% - clamp(1.5rem, 4vw, 3rem)));
  margin-inline: auto;
}

.container--narrow {
  width: min(var(--content-default), calc(100% - clamp(1.5rem, 4vw, 3rem)));
  margin-inline: auto;
}

/* =====================================================
   HEADER / NAV
   ===================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background:
    linear-gradient(180deg, oklch(from var(--color-bg) l c h / 0.94), oklch(from var(--color-bg) l c h / 0.82));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.site-header--scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 88px;
  padding-block: var(--space-3);
}

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

.nav-logo-img {
  height: clamp(50px, 5vw, 72px);
  width: auto;
  object-fit: contain;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1;
}

.nav-logo-devanagari {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-weight: 400;
  display: block;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color var(--transition-interactive);
}

.nav-links a:hover { color: var(--color-primary); }

.nav-cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.btn-theme {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.btn-theme:hover { color: var(--color-text); background: var(--color-surface-offset); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 10px 24px oklch(from var(--color-primary) l c h / 0.18);
}
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover { color: var(--color-text); border-color: var(--color-text-muted); background: var(--color-surface-offset); }

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}
.btn-accent:hover { background: var(--color-accent-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* Mobile nav toggle */
.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  cursor: pointer;
  background: none;
  border: none;
  padding: var(--space-2);
}
.nav-mobile-toggle span {
  display: block;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}

/* =====================================================
   HERO
   ===================================================== */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    oklch(0.06 0.01 200 / 0.42) 0%,
    oklch(0.06 0.01 200 / 0.74) 52%,
    oklch(0.06 0.01 200 / 0.94) 100%
  );
}

[data-theme="light"] .hero-bg::after {
  background: linear-gradient(
    to bottom,
    oklch(0.97 0.008 80 / 0.52) 0%,
    oklch(0.97 0.008 80 / 0.8) 50%,
    oklch(0.97 0.008 80 / 0.97) 100%
  );
}

.hero-content.container {
  position: relative;
  z-index: 1;
  width: min(820px, calc(100% - clamp(1.5rem, 4vw, 3rem)));
  margin-inline: clamp(1rem, 6vw, 4.5rem) auto;
  padding: clamp(var(--space-8), 4vw, var(--space-12));
  border: 1px solid oklch(from var(--color-border) l c h / 0.75);
  border-radius: 32px;
  background:
    linear-gradient(145deg, oklch(from var(--color-surface) l c h / 0.8), oklch(from var(--color-bg) l c h / 0.58));
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-xl);
}

.hero-content::before {
  content: '';
  position: absolute;
  inset: 16px;
  border-radius: 24px;
  border: 1px solid oklch(from var(--color-primary) l c h / 0.18);
  pointer-events: none;
}

.hero-brand-lockup {
  margin-bottom: var(--space-8);
}

.hero-logo-img {
  height: clamp(112px, 16vw, 160px);
  width: auto;
  object-fit: contain;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.eyebrow-tag {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow-dot {
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-headline {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1.0;
  margin-bottom: var(--space-6);
}

.hero-headline em {
  font-style: italic;
  color: var(--color-primary);
}

.hero-subhead {
  font-size: var(--text-lg);
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-5);
}

.hero-tagline {
  font-size: var(--text-base);
  color: color-mix(in oklab, var(--color-text) 72%, var(--color-text-muted));
  max-width: 48ch;
  line-height: 1.7;
  margin-bottom: var(--space-12);
}

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

.hero-actions .btn {
  min-width: 180px;
  justify-content: center;
}

.hero-scroll-hint {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  opacity: 0.5;
}

.hero-scroll-hint span {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-primary), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.6); }
}

/* =====================================================
   METRICS STRIP
   ===================================================== */

.metrics-strip {
  position: relative;
  z-index: 2;
  margin-top: calc(var(--space-12) * -1);
  padding-bottom: var(--space-8);
  background: transparent;
  border: none;
}

.metrics-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  padding: clamp(var(--space-5), 3vw, var(--space-8));
  border: 1px solid var(--color-border);
  border-radius: 28px;
  background:
    linear-gradient(180deg, var(--color-surface-2), var(--color-surface));
  box-shadow: var(--shadow-lg);
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.metric-value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1;
}

.metric-value .accent { color: var(--color-primary); }

.metric-label {
  font-size: var(--text-xs);
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* =====================================================
   SECTION COMMONS
   ===================================================== */

section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.section-label-text {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-label-line {
  width: 40px;
  height: 1px;
  background: var(--color-primary);
  opacity: 0.4;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: var(--space-5);
}

.section-title em {
  font-style: italic;
  color: var(--color-primary);
}

.section-intro {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: 1.75;
}

/* =====================================================
   PHILOSOPHY SECTION
   ===================================================== */

.philosophy {
  background: var(--color-bg);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
  margin-top: var(--space-16);
}

.philosophy-grid > * {
  min-width: 0;
}

.philosophy-text {}

.philosophy-quote {
  position: relative;
  padding: var(--space-10) var(--space-8);
  border-left: 2px solid var(--color-primary);
  margin-block: var(--space-8);
}

.philosophy-quote blockquote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-style: italic;
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.3;
  max-width: none;
}

.philosophy-quote cite {
  display: block;
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-style: normal;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.philosophy-visual {
  position: relative;
  /* Prevent grid cell blowout when iframe is wider than the track */
  min-width: 0;
  overflow: hidden;
}

.philosophy-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.philosophy-img-wrap img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

/* === Interactive viz embed === */
.viz-embed-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  background: #0e0d0b;
  /* Never exceed the column it sits in */
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
}

/* Scale container: clips the scaled-up iframe to exact visual height */
.viz-scale-outer {
  position: relative;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  box-sizing: border-box;
  /* height set by JS */
}

.viz-iframe {
  border: none;
  display: block;
  transform-origin: top left;
  /* width, height, transform set by JS */
}

.viz-iframe-sm {
  border: none;
  display: block;
  transform-origin: top left;
  /* width, height, transform set by JS */
}

.viz-caption {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.viz-caption--card {
  padding: var(--space-3) var(--space-4);
}

.viz-caption-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.viz-caption-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Expertise viz card overrides */
.expertise-viz-card {
  overflow: visible;
  display: flex;
  flex-direction: column;
}

.expertise-viz-card .viz-iframe-sm {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.expertise-viz-card .viz-caption--card {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.philosophy-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    oklch(from var(--color-primary) l c h / 0.08) 0%,
    transparent 60%
  );
}

/* Sanskrit modules grid */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.module-badge {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}

.module-badge:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-2);
}

.module-sanskrit {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.module-name {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* =====================================================
   SERVICES SECTION
   ===================================================== */

.services {
  background: var(--color-surface);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.service-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.service-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: center;
  display: block;
  background: var(--color-surface-offset);
}

.service-card-body {
  padding: var(--space-8);
}

.service-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.12em;
  margin-bottom: var(--space-3);
}

.service-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--space-4);
}

.service-title em {
  font-style: italic;
  color: var(--color-primary);
}

.service-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}

/* =====================================================
   APPROACH SECTION
   ===================================================== */

.approach {
  background: var(--color-bg);
}

.approach-steps {
  margin-top: var(--space-16);
  display: grid;
  gap: var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.step-item {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-10);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background var(--transition-interactive);
}

.step-item:last-child { border-bottom: none; }

.step-item:hover { background: var(--color-surface-2); }

.step-item.active {
  background: var(--color-surface-2);
  border-left: 3px solid var(--color-primary);
}

.step-num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 400;
  color: var(--color-border);
  letter-spacing: -0.04em;
  line-height: 1;
  transition: color var(--transition-interactive);
}

.step-item.active .step-num,
.step-item:hover .step-num {
  color: var(--color-primary);
}

.step-content {}

.step-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.step-detail {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 55ch;
}

.step-arrow {
  color: var(--color-text-faint);
  transition: color var(--transition-interactive), transform var(--transition-interactive);
}

.step-item:hover .step-arrow {
  color: var(--color-primary);
  transform: translateX(4px);
}

/* =====================================================
   EXPERTISE SECTION
   ===================================================== */

.expertise {
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
}

.expertise::before {
  content: 'शून्य';
  position: absolute;
  right: -0.1em;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-size: clamp(8rem, 20vw, 18rem);
  font-weight: 400;
  color: var(--color-border);
  opacity: 0.25;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.expertise-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
  margin-top: var(--space-12);
  position: relative;
  z-index: 1;
}

.expertise-layout > * {
  min-width: 0;
}

.expertise-list {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
}

.expertise-item {
  display: flex;
  gap: var(--space-5);
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-interactive), transform var(--transition-interactive);
  min-width: 0;
}

.expertise-item:hover {
  border-color: var(--color-primary);
  transform: translateX(4px);
}

.expertise-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.expertise-text {}
.expertise-text { min-width: 0; }

.expertise-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
  letter-spacing: 0.01em;
}

.expertise-detail {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: none;
}

.expertise-visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  min-width: 0;
  width: 100%;
}

.expertise-img-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  width: 100%;
  min-width: 0;
}

.expertise-img-card img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
}

/* =====================================================
   CLIENTS / USE CASES SECTION
   ===================================================== */

.use-cases {
  background: var(--color-bg);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.case-card {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}

.case-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.case-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.case-type {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.case-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.case-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  flex: 1;
  max-width: none;
}

.case-outcomes {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.outcome {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.outcome::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  flex-shrink: 0;
}

/* =====================================================
   PRICING / ENGAGEMENT
   ===================================================== */

.engagement {
  background: var(--color-surface);
}

.engagement-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.tier-card {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  position: relative;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.tier-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.tier-card.featured {
  border-color: var(--color-primary);
  background: var(--color-surface-2);
}

.tier-card.featured::before {
  content: 'Most Requested';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-4);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.tier-name {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tier-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.tier-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: none;
}

.tier-deliverables {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1;
}

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

.deliverable-check {
  width: 16px;
  height: 16px;
  min-width: 16px;
  margin-top: 2px;
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.tier-timeline {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text-faint);
  letter-spacing: 0.06em;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* =====================================================
   CTA SECTION
   ===================================================== */

.cta-section {
  background: var(--color-bg);
  text-align: center;
}

.cta-inner {
  max-width: 640px;
  margin-inline: auto;
}

.cta-section .section-title {
  margin-bottom: var(--space-5);
}

.cta-section p {
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-10);
}

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

.cta-note {
  margin-top: var(--space-6);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text-faint);
  letter-spacing: 0.06em;
}

/* =====================================================
   FOOTER
   ===================================================== */

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding-block: var(--space-12);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-12);
}

.footer-brand {}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.footer-brand-devanagari {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
}

.footer-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 36ch;
}

.footer-back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color var(--transition-interactive);
}
.footer-back-link:hover { color: var(--color-primary-hover); }
.footer-back-link svg { transition: transform var(--transition-interactive); }
.footer-back-link:hover svg { transform: translateX(-3px); }

.footer-col-title {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.footer-col-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.footer-col-links a:hover { color: var(--color-primary); }

.footer-bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-bottom-left {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.footer-bottom-right {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-bottom-right a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.footer-bottom-right a:hover { color: var(--color-primary); }

/* =====================================================
   SCROLL REVEAL ANIMATIONS
   ===================================================== */

.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 60%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

/* =====================================================
   RESPONSIVE
   ===================================================== */

@media (max-width: 1024px) {
  .nav-links { gap: var(--space-4); }
  .hero-content.container {
    width: min(760px, calc(100% - clamp(1.5rem, 4vw, 2rem)));
    margin-inline: auto;
  }
  .services-grid { grid-template-columns: 1fr; }
  .philosophy-grid { grid-template-columns: 1fr; gap: var(--space-10); }
  .expertise-layout { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .engagement-grid { grid-template-columns: 1fr; max-width: 520px; }
  .modules-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .site-header {
    background:
      linear-gradient(180deg, oklch(from var(--color-bg) l c h / 0.97), oklch(from var(--color-bg) l c h / 0.92));
  }

  .nav-inner {
    min-height: 72px;
    gap: var(--space-2);
  }

  .nav-logo-img {
    height: 46px;
  }

  .nav-cta {
    gap: var(--space-2);
  }

  .nav-header-cta {
    display: none !important;
  }

  .nav-links { display: none; }
  .nav-mobile-toggle { display: flex; }

  .nav-links.nav-open {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background:
      radial-gradient(circle at top, oklch(from var(--color-primary) l c h / 0.12), transparent 30%),
      var(--color-bg);
    z-index: 200;
    gap: var(--space-8);
  }

  .nav-links.nav-open a {
    font-size: var(--text-xl);
    color: var(--color-text);
  }

  .metrics-inner { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .engagement-grid { grid-template-columns: 1fr; }

  .hero {
    min-height: auto;
    padding-top: var(--space-8);
  }

  .hero-content.container {
    width: calc(100% - 1.5rem);
    margin-inline: auto;
    padding: var(--space-6);
    border-radius: 24px;
  }

  .hero-content::before {
    inset: 12px;
    border-radius: 18px;
  }

  .hero-brand-lockup {
    margin-bottom: var(--space-6);
  }

  .hero-logo-img {
    height: 96px;
  }

  .hero-headline {
    font-size: clamp(3.1rem, 14vw, 4.8rem);
    line-height: 0.95;
  }

  .hero-subhead {
    max-width: 24ch;
  }

  .hero-tagline {
    margin-bottom: var(--space-8);
  }

  .hero-scroll-hint {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .metrics-strip {
    margin-top: calc(var(--space-8) * -1);
    padding-bottom: var(--space-4);
  }

  .step-item {
    grid-template-columns: 50px 1fr auto;
    gap: var(--space-4);
    padding: var(--space-6);
  }

  .service-card-body,
  .case-card,
  .tier-card {
    padding: var(--space-6);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .metrics-inner { grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
  .hero-content.container {
    width: calc(100% - 1rem);
    padding: var(--space-5);
  }

  .hero-headline {
    font-size: clamp(2.6rem, 14vw, 3.4rem);
  }

  .cta-actions { flex-direction: column; align-items: center; }
  .services-grid { grid-template-columns: 1fr; }
  .modules-grid { grid-template-columns: 1fr; }

  .expertise::before {
    display: none;
  }

  .expertise-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .step-item {
    grid-template-columns: 1fr;
  }

  .step-arrow {
    display: none;
  }
}