/**
 * KALPA Layout System
 * Floating navigation with theme switch, editorial grids, and warm ambient lighting
 */

/* ==========================================================================
   Floating Navigation
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: clamp(0.85rem, 2vw, 1.4rem) var(--container-pad);
  transition: padding var(--transition-smooth);
  pointer-events: none;
}

.site-header.is-scrolled {
  padding-block: 0.65rem;
}

.nav-bar {
  pointer-events: auto;
  max-width: var(--container-max);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 1.15rem 0.55rem 1.35rem;
  background-color: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--nav-border);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-smooth), 
              border-color var(--transition-smooth), 
              box-shadow var(--transition-smooth);
}

.site-header.is-scrolled .nav-bar {
  background-color: var(--nav-bg-scrolled);
  border-color: var(--nav-border-scrolled);
  box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.25);
}

/* Brand Wordmark */
/* Brand Logo - Responsive Desktop Concept C & Mobile Concept B */
.brand-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.brand-link:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.brand-logo-wrap {
  display: flex;
  align-items: center;
  position: relative;
}

/* Desktop: Full Concept C Primary Logo (KALPA + Tagline) */
.brand-logo-desktop {
  display: block;
  height: 28px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.25));
  transition: filter var(--transition-fast);
}

/* Mobile: Concept B Monogram Icon (K) */
.brand-logo-mobile {
  display: none;
  height: 32px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.25));
}

/* Dark vs Light mode logo switching */
[data-theme="dark"] .logo-theme-light {
  display: none !important;
}

[data-theme="light"] .logo-theme-dark {
  display: none !important;
}

[data-theme="dark"] .brand-logo-desktop.logo-theme-dark {
  display: block;
}

[data-theme="light"] .brand-logo-desktop.logo-theme-light {
  display: block;
}

/* On mobile (< 768px): Show Monogram Icon in header navbar while preserving footer logo */
@media (max-width: 768px) {
  .site-header .brand-logo-desktop {
    display: none !important;
  }
  [data-theme="dark"] .site-header .brand-logo-mobile.logo-theme-dark {
    display: block !important;
  }
  [data-theme="light"] .site-header .brand-logo-mobile.logo-theme-light {
    display: block !important;
  }

  .site-footer .brand-logo-desktop {
    height: 24px;
    width: auto;
  }
  [data-theme="dark"] .site-footer .brand-logo-desktop.logo-theme-dark {
    display: block !important;
  }
  [data-theme="light"] .site-footer .brand-logo-desktop.logo-theme-light {
    display: block !important;
  }
}

/* Navigation Links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.2vw, 2rem);
  list-style: none;
}

.nav-link {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  position: relative;
  padding-block: 0.25rem;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 1px;
  background-color: var(--text-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Theme Toggle Button - Luxury Metallic Pill Switch */
.theme-toggle {
  width: 50px;
  height: 28px;
  padding: 3px 6px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  box-shadow: var(--metallic-bevel);
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.theme-toggle svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  position: relative;
  z-index: 2;
  transition: opacity var(--transition-fast);
}

.theme-toggle .theme-slider-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2B2824 0%, #11100F 100%);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-smooth), background var(--transition-smooth);
  z-index: 1;
}

[data-theme="light"] .theme-toggle {
  background: linear-gradient(180deg, #FFFFFF 0%, #EEF2F6 100%);
  border-color: rgba(0, 0, 0, 0.14);
}

[data-theme="light"] .theme-toggle .theme-slider-thumb {
  transform: translateX(22px);
  background: linear-gradient(135deg, #FFFFFF 0%, #E2E7ED 100%);
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: inset 0 1px 0 #FFFFFF, 0 2px 6px rgba(0, 20, 50, 0.12);
}

/* Light/Dark icon visibility inside pill */
.icon-sun {
  opacity: 0.35;
}
.icon-moon {
  opacity: 1;
}

[data-theme="light"] .icon-sun {
  opacity: 1;
  color: #0A0D12;
}
[data-theme="light"] .icon-moon {
  opacity: 0.35;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  padding: 8px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
  cursor: pointer;
}

.mobile-nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  transform-origin: center;
}

.mobile-nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-primary);
  z-index: calc(var(--z-nav) - 1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 5.5rem var(--container-pad) 2rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.mobile-drawer.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav-link {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: inline-block;
}

.mobile-drawer-footer {
  border-top: 1px solid var(--border-default);
  padding-top: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-theme-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ==========================================================================
   Hero Section Layout
   ========================================================================== */

.hero-section {
  position: relative;
  height: 100vh;
  height: 100dvh;
  max-height: 100vh;
  max-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding-top: clamp(4.75rem, 8vh, 5.85rem);
  padding-bottom: clamp(0.75rem, 1.8vh, 1.25rem);
  overflow: hidden;
  box-sizing: border-box;
  background-color: var(--bg-primary);
  background-image: radial-gradient(ellipse 70% 55% at 50% 25%, var(--warm-glow), transparent 75%);
}

/* ==========================================================================
   Hero Atmospheric Backdrop (hero_dark_1 & hero_light_1)
   ========================================================================== */

.hero-backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.hero-backdrop-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  transition: opacity var(--transition-theme, 0.4s ease), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

/* Dark theme: hero_dark_1 luminous architectural ribbon (Style 2) */
[data-theme="dark"] .hero-backdrop-dark {
  display: block;
  opacity: 0.85;
  mix-blend-mode: screen;
  object-position: center center;
  filter: contrast(1.1) brightness(0.95);
}

[data-theme="dark"] .hero-backdrop-light {
  display: none !important;
}

/* Light theme: hero_light_1 architectural sail pavilion (Style 3 - White and Bright) */
[data-theme="light"] .hero-backdrop-dark {
  display: none !important;
}

[data-theme="light"] .hero-backdrop-light {
  display: block;
  opacity: 0.88;
  mix-blend-mode: normal;
  object-position: right bottom;
  filter: contrast(1.02) brightness(1.0);
}

/* Seamless edge and bottom vignette blending - pure white / pure obsidian */
.hero-backdrop-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}

[data-theme="dark"] .hero-backdrop-vignette {
  background: 
    linear-gradient(to right, #050505 0%, rgba(5, 5, 5, 0.85) 28%, transparent 58%),
    linear-gradient(to bottom, rgba(5, 5, 5, 0.35) 0%, transparent 20%, transparent 70%, #050505 100%),
    radial-gradient(ellipse 95% 85% at 50% 45%, transparent 40%, rgba(5, 5, 5, 0.7) 75%, #050505 100%);
}

[data-theme="light"] .hero-backdrop-vignette {
  background: 
    linear-gradient(to right, #FFFFFF 0%, rgba(255, 255, 255, 0.95) 28%, rgba(255, 255, 255, 0.55) 48%, transparent 68%),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.4) 0%, transparent 20%, transparent 70%, #FFFFFF 100%),
    linear-gradient(to top, #FFFFFF 0%, rgba(255, 255, 255, 0.6) 10%, transparent 25%);
}

.hero-meta-bar {
  position: relative;
  z-index: var(--z-content);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: clamp(0.35rem, 0.8vh, 0.6rem);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: clamp(0.4rem, 1vh, 0.75rem);
  flex-shrink: 0;
}

.hero-content {
  position: relative;
  z-index: var(--z-content);
  max-width: var(--container-max);
  width: 100%;
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: clamp(1.5rem, 3.2vw, 3.5rem);
}

@media (max-width: 980px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 0.85rem;
    align-content: center;
  }
}

.hero-text-col {
  display: flex;
  flex-direction: column;
}

.hero-headline {
  margin-bottom: clamp(0.6rem, 1.4vh, 1.15rem);
  font-size: clamp(1.85rem, 3.4vw, 3.2rem);
  line-height: 1.05;
  text-shadow: 0 2px 28px rgba(0, 0, 0, 0.55);
}

[data-theme="light"] .hero-headline {
  text-shadow: none;
}

.hero-headline span {
  display: block;
}

.hero-support-copy {
  max-width: 520px;
  font-size: clamp(0.92rem, 1.1vw, 1.0625rem);
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: clamp(0.85rem, 1.8vh, 1.5rem);
}

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

/* ==========================================================================
   Architectural Disciplines / Pillars Column Matching hero_bgs_2.png
   ========================================================================== */

.hero-pillars-col {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  height: 100%;
  padding-right: clamp(1rem, 3.5vw, 3rem);
  z-index: var(--z-content);
}

.hero-pillar-list {
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 2.5vh, 1.85rem);
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: right;
}

.hero-pillar-list li {
  font-family: var(--font-display);
  font-size: clamp(0.72rem, 0.92vw, 0.84rem);
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  line-height: 1.4;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.hero-pillar-list li:hover {
  transform: translateX(-4px);
}

/* Dark theme: Style 2 disciplines (WEBSITES, DIGITAL EXPERIENCES, INTELLIGENT SYSTEMS) */
[data-theme="dark"] .hero-pillar-dark {
  display: flex;
}

[data-theme="dark"] .hero-pillar-dark li {
  color: rgba(255, 255, 255, 0.68);
}

[data-theme="dark"] .hero-pillar-dark li:hover {
  color: #FFFFFF;
}

[data-theme="dark"] .hero-pillar-light {
  display: none !important;
}

/* Light theme: Style 3 pillars (PEOPLE, IDEAS, TECHNOLOGY, A BRIGHTER TOMORROW) */
[data-theme="light"] .hero-pillar-light {
  display: flex;
}

[data-theme="light"] .hero-pillar-light li {
  color: rgba(10, 13, 18, 0.65);
}

[data-theme="light"] .hero-pillar-light li:hover {
  color: #0A0D12;
}

[data-theme="light"] .hero-pillar-dark {
  display: none !important;
}

@media (max-width: 980px) {
  .hero-pillars-col {
    align-items: flex-start;
    padding-right: 0;
    margin-top: 1rem;
  }

  .hero-pillar-list {
    text-align: left;
    gap: 0.75rem;
  }
}

@media (max-width: 768px) {
  .hero-backdrop-img {
    object-position: 55% center;
  }

  .hero-pillars-col {
    display: none !important;
  }
}

.hero-bottom-bar {
  position: relative;
  z-index: var(--z-content);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: clamp(0.35rem, 0.9vh, 0.65rem);
  border-top: 1px solid var(--border-subtle);
  margin-top: clamp(0.4rem, 1vh, 0.75rem);
  flex-shrink: 0;
}

.scroll-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-display);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.scroll-indicator:hover {
  color: var(--text-primary);
}

.scroll-trail-line {
  display: inline-block;
  width: 44px;
  height: 1px;
  background-color: var(--text-muted);
  opacity: 0.6;
  transition: width var(--transition-fast), background-color var(--transition-fast), opacity var(--transition-fast);
  vertical-align: middle;
}

.scroll-indicator:hover .scroll-trail-line {
  width: 60px;
  background-color: var(--text-primary);
  opacity: 1;
}

.hero-counter-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  font-weight: 600;
  color: var(--text-muted);
}

.hero-counter-bar {
  width: 56px;
  height: 2px;
  background-color: var(--border-default);
  position: relative;
  overflow: hidden;
}

.hero-counter-bar::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--counter-progress, 20%);
  background-color: var(--text-primary);
  transition: width var(--transition-smooth);
}

/* ==========================================================================
   Statement Section Layout
   ========================================================================== */

.statement-section {
  background-color: var(--bg-secondary);
  border-block: 1px solid var(--border-default);
  position: relative;
  overflow: hidden;
}

.statement-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 30%;
  width: 60%;
  height: 80%;
  background: radial-gradient(circle at center, var(--warm-glow), transparent 70%);
  pointer-events: none;
}

.statement-header-label {
  margin-bottom: clamp(1.25rem, 2.5vw, 2rem);
}

.statement-headline {
  margin-bottom: clamp(1.5rem, 2.5vw, 2.25rem);
  max-width: 880px;
}

.statement-support {
  max-width: 640px;
  font-size: clamp(1.0625rem, 1.35vw, 1.25rem);
  line-height: 1.62;
  color: var(--text-secondary);
  margin-bottom: clamp(3rem, 6vw, 4.75rem);
}

/* Triad Architectural Grid */
.triad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--border-default);
  position: relative;
  background-color: var(--border-default);
}

.triad-item {
  padding: clamp(1.75rem, 3.2vw, 2.85rem) clamp(1.25rem, 2.5vw, 2.15rem);
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 200px;
  position: relative;
  transition: background-color var(--transition-smooth);
}

.triad-item:not(:last-child) {
  border-right: 1px solid var(--border-default);
}

.triad-item:hover {
  background-color: var(--bg-surface);
}

.triad-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.triad-title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 1.9vw, 1.65rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
}

.triad-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.58;
}

/* ==========================================================================
   Footer Layout
   ========================================================================== */

.site-footer {
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-default);
  padding-top: clamp(3.5rem, 6.5vw, 5.25rem);
  padding-bottom: clamp(2rem, 3.5vw, 2.75rem);
  position: relative;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: clamp(1.75rem, 3.5vw, 3.5rem);
  margin-bottom: clamp(3rem, 5.5vw, 4.5rem);
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  text-transform: uppercase;
}

.footer-positioning {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.footer-tagline {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  color: var(--text-muted);
  font-style: italic;
}

.footer-col-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-bottom-bar {
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copyright {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-legal-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Breakpoints for Layout
   ========================================================================== */

@media (max-width: 1024px) {
  .triad-grid {
    grid-template-columns: 1fr;
  }

  .triad-item:not(:last-child) {
    border-right: none;
    border-bottom: 1px solid var(--border-default);
  }

  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .nav-actions .btn-primary {
    display: none;
  }

  .mobile-nav-toggle {
    display: flex;
  }

  .hero-meta-bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    font-size: 0.72rem;
  }

  .hero-meta-bar span:last-child {
    display: none;
  }

  .hero-headline {
    font-size: clamp(1.45rem, 5.8vw, 2rem);
    line-height: 1.08;
    margin-bottom: 0.4rem;
  }

  .hero-support-copy {
    font-size: 0.825rem;
    line-height: 1.45;
    margin-bottom: 0.65rem;
  }

  .hero-actions {
    gap: 0.4rem;
  }

  .hero-actions .btn {
    padding: 0.45rem 0.9rem;
    font-size: 0.8rem;
  }

  .hero-sculpture-card {
    max-width: 200px;
    margin-inline: auto;
  }

  .hero-sculpture-img {
    max-height: min(20vh, 160px);
  }

  .hero-bottom-bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
  }
}