/* ==========================================================================
   CROWNATESTUDIO SERVICE EXPERIENCE: FROM UNCERTAINTY TO INTELLIGENCE
   Minimalist Architectural Built-Environment Platform
   Palette: #F5F3EE (bg) | #111111 (primary) | #777777 (secondary)
            #D8D5CE (borders) | #B89A5A (accent, used sparingly)
   ========================================================================== */

:root {
  --cs-bg: #F5F3EE;
  --cs-text-primary: #111111;
  --cs-text-secondary: #777777;
  --cs-border: #D8D5CE;
  --cs-border-subtle: #E8E5DD;
  --cs-accent: #B89A5A;
  --cs-accent-subtle: rgba(184, 154, 90, 0.15);
  --cs-surface: #FFFFFF;
  --cs-surface-alt: #FAF8F5;
}

/* 1. HERO SECTION: Services built around certainty */
.cs-hero-section {
  background-color: var(--cs-bg);
  border-bottom: 1px solid var(--cs-border);
  padding: clamp(3.5rem, 7vw, 6rem) 0 clamp(2.5rem, 5vw, 4rem) 0;
  position: relative;
}

.cs-hero-inner {
  max-width: var(--container-max, 1440px);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.cs-concept-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-text-primary);
  background: var(--cs-surface);
  border: 1px solid var(--cs-border);
  padding: 0.35rem 0.85rem;
  margin-bottom: 1.5rem;
}

.cs-concept-dot {
  width: 7px;
  height: 7px;
  background-color: var(--cs-accent);
  display: inline-block;
}

.cs-hero-title {
  font-family: var(--font-sans, 'Inter', sans-serif);
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--cs-text-primary);
  text-transform: uppercase;
  max-width: 980px;
  margin: 0 0 1.5rem 0;
}

.cs-hero-desc {
  font-family: var(--font-sans, 'Inter', sans-serif);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  font-weight: 400;
  line-height: 1.65;
  color: var(--cs-text-secondary);
  max-width: 820px;
  margin: 0 0 2.5rem 0;
}

.cs-hero-scroll-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cs-text-primary);
  text-decoration: none;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--cs-text-primary);
  transition: all 0.2s ease;
}

.cs-hero-scroll-trigger:hover {
  color: var(--cs-accent);
  border-color: var(--cs-accent);
}

.cs-hero-scroll-trigger svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.cs-hero-scroll-trigger:hover svg {
  transform: translateY(3px);
}

/* 2. THE SCROLL EXPERIENCE CONTAINER */
.cs-experience-wrapper {
  background-color: var(--cs-bg);
  position: relative;
  border-bottom: 1px solid var(--cs-border);
}

/* Sticky Viewport (Desktop) */
.cs-sticky-viewport {
  position: sticky;
  top: 72px; /* Clears site header */
  height: calc(100vh - 72px);
  max-height: 960px;
  min-height: 640px;
  display: grid;
  grid-template-columns: 260px minmax(360px, 1.15fr) minmax(340px, 1fr);
  gap: clamp(1.5rem, 2.5vw, 3rem);
  align-items: center;
  max-width: var(--container-max, 1440px);
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
  box-sizing: border-box;
}

/* Invisible background step anchors for natural document scrolling */
.cs-scroll-track {
  position: relative;
}

.cs-scroll-step {
  height: 100vh;
  position: relative;
  pointer-events: none;
}

/* ==========================================================================
   LEFT COLUMN: NAV & VERTICAL PROGRESS SYSTEM
   ========================================================================== */
.cs-nav-column {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  position: relative;
}

.cs-nav-header {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-text-secondary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--cs-border);
}

.cs-progress-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  padding-left: 1.5rem;
}

/* Vertical Progress Line Track */
.cs-progress-track-line {
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 5px;
  width: 1px;
  background-color: var(--cs-border);
}

.cs-progress-bar-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background-color: var(--cs-accent);
  transition: height 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.cs-nav-btn {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  background: transparent;
  border: none;
  padding: 0.5rem 0.25rem;
  text-align: left;
  cursor: pointer;
  position: relative;
  color: var(--cs-text-secondary);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: all 0.2s ease;
  outline: none;
}

.cs-nav-btn:hover {
  color: var(--cs-text-primary);
}

.cs-nav-btn:focus-visible {
  outline: 2px solid var(--cs-accent);
  outline-offset: 2px;
}

.cs-nav-num {
  font-weight: 700;
  color: var(--cs-text-secondary);
  transition: color 0.2s ease;
  position: relative;
}

/* Node indicator dot on the track */
.cs-nav-node {
  position: absolute;
  left: -1.5rem;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 7px;
  height: 7px;
  border-radius: 0;
  background-color: var(--cs-bg);
  border: 1px solid var(--cs-border);
  transition: all 0.25s ease;
}

.cs-nav-btn.active {
  color: var(--cs-text-primary);
}

.cs-nav-btn.active .cs-nav-node {
  background-color: var(--cs-accent);
  border-color: var(--cs-accent);
  transform: translate(-50%, -50%) scale(1.3);
}

.cs-nav-btn.active .cs-nav-num {
  color: var(--cs-accent);
}

.cs-nav-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 190px;
}

/* ==========================================================================
   CENTER COLUMN: TECHNICAL VISUALS
   ========================================================================== */
.cs-visual-column {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
}

.cs-visual-stage {
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 520px;
  max-height: 520px;
  background-color: var(--cs-surface);
  border: 1px solid var(--cs-border);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

/* Technical HUD overlay frame */
.cs-stage-hud-top {
  position: absolute;
  top: 10px;
  left: 12px;
  right: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cs-text-secondary);
  pointer-events: none;
  z-index: 5;
}

.cs-stage-hud-bottom {
  position: absolute;
  bottom: 10px;
  left: 12px;
  right: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--cs-text-secondary);
  pointer-events: none;
  z-index: 5;
}

/* Corner Crosshairs */
.cs-crosshair {
  position: absolute;
  width: 8px;
  height: 8px;
  pointer-events: none;
  z-index: 4;
}

.cs-crosshair::before,
.cs-crosshair::after {
  content: '';
  position: absolute;
  background-color: var(--cs-border);
}

.cs-crosshair-tl { top: 6px; left: 6px; }
.cs-crosshair-tr { top: 6px; right: 6px; }
.cs-crosshair-bl { bottom: 6px; left: 6px; }
.cs-crosshair-br { bottom: 6px; right: 6px; }

.cs-crosshair::before { top: 3px; left: 0; width: 8px; height: 1px; }
.cs-crosshair::after { top: 0; left: 3px; width: 1px; height: 8px; }

/* SVG Visual Panels */
.cs-svg-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 2.5rem 1.5rem;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(24px) scale(0.96);
  transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.45s ease;
  pointer-events: none;
}

.cs-svg-panel.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.cs-svg-panel svg {
  width: 100%;
  height: 100%;
  max-width: 440px;
  max-height: 440px;
  display: block;
}

/* ==========================================================================
   RIGHT COLUMN: ACTIVE SERVICE DETAILS
   ========================================================================== */
.cs-detail-column {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  position: relative;
}

.cs-detail-panel {
  position: absolute;
  top: 50%;
  transform: translateY(-50%) translateY(30px);
  width: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.4s ease;
  pointer-events: none;
}

.cs-detail-panel.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateY(0);
  pointer-events: auto;
}

.cs-detail-header-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.cs-detail-index {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--cs-accent);
  letter-spacing: 0.08em;
}

.cs-detail-theme {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-text-secondary);
}

.cs-detail-title {
  font-family: var(--font-sans, 'Inter', sans-serif);
  font-size: clamp(1.6rem, 2.5vw, 2.3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--cs-text-primary);
  margin: 0 0 1rem 0;
}

/* Visual Process Flow Breadcrumb */
.cs-process-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--cs-surface);
  border: 1px solid var(--cs-border);
  padding: 0.5rem 0.75rem;
  margin-bottom: 1.25rem;
}

.cs-process-node {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cs-text-primary);
}

.cs-process-arrow {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.68rem;
  color: var(--cs-accent);
}

.cs-detail-desc {
  font-family: var(--font-sans, 'Inter', sans-serif);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--cs-text-secondary);
  margin: 0 0 1.25rem 0;
}

/* Key Capabilities Grid */
.cs-capabilities-title {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cs-text-primary);
  margin-bottom: 0.5rem;
}

.cs-capabilities-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
}

.cs-capability-item {
  font-family: var(--font-sans, 'Inter', sans-serif);
  font-size: 0.85rem;
  color: var(--cs-text-primary);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.4;
}

.cs-capability-bullet {
  color: var(--cs-accent);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  line-height: 1.4;
}

/* Primary CTA Button */
.cs-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background-color: var(--cs-text-primary);
  color: #FFFFFF;
  border: 1px solid var(--cs-text-primary);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition: all 0.2s ease;
}

.cs-cta-btn:hover {
  background-color: var(--cs-accent);
  border-color: var(--cs-accent);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.cs-cta-btn:focus-visible {
  outline: 2px solid var(--cs-accent);
  outline-offset: 2px;
}

/* Transition Section Divider */
.cs-ecosystem-divider {
  background: var(--cs-bg);
  border-top: 1px solid var(--cs-border);
  border-bottom: 1px solid var(--cs-border);
  padding: 2.5rem 1.5rem;
  text-align: center;
}

.cs-ecosystem-divider-inner {
  max-width: var(--container-max, 1440px);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.cs-ecosystem-statement {
  font-family: var(--font-sans, 'Inter', sans-serif);
  font-size: 1.15rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--cs-text-primary);
  text-align: left;
}

.cs-ecosystem-sub {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.78rem;
  color: var(--cs-text-secondary);
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* ==========================================================================
   MOBILE & TABLET RESPONSIVENESS (<= 991px)
   A Dedicated Natural Vertical Layout (NOT a shrunken sticky layout)
   ========================================================================== */
@media (max-width: 991px) {
  .cs-scroll-track {
    display: none; /* Hide background scroll triggers on mobile */
  }

  .cs-sticky-viewport {
    position: static;
    height: auto;
    max-height: none;
    min-height: auto;
    display: flex;
    flex-direction: column;
    padding: 0;
  }

  /* Sticky Mobile Progress Header */
  .cs-mobile-progress-bar {
    display: block;
    position: sticky;
    top: 70px;
    z-index: 90;
    background: var(--cs-bg);
    border-bottom: 1px solid var(--cs-border);
    padding: 0.75rem 1.25rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
  }

  .cs-mobile-progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--cs-text-primary);
    text-transform: uppercase;
    margin-bottom: 0.4rem;
  }

  .cs-mobile-progress-track {
    width: 100%;
    height: 2px;
    background-color: var(--cs-border);
    position: relative;
    overflow: hidden;
  }

  .cs-mobile-progress-fill {
    height: 100%;
    width: 14.28%;
    background-color: var(--cs-accent);
    transition: width 0.3s ease;
  }

  .cs-nav-column {
    display: none; /* Replaced by mobile sticky progress header */
  }

  .cs-visual-column {
    display: none; /* Desktop stage container hidden */
  }

  .cs-detail-column {
    display: none; /* Desktop absolute detail container hidden */
  }

  /* Dedicated Mobile Card Sequence */
  .cs-mobile-services-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    padding: 2rem 1.25rem 4rem 1.25rem;
  }

  .cs-mobile-service-card {
    background-color: var(--cs-surface);
    border: 1px solid var(--cs-border);
    padding: 1.75rem 1.25rem;
    position: relative;
  }

  .cs-mobile-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
  }

  .cs-mobile-card-idx {
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--cs-accent);
  }

  .cs-mobile-card-theme {
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    font-size: 0.7rem;
    color: var(--cs-text-secondary);
    text-transform: uppercase;
  }

  .cs-mobile-card-title {
    font-size: 1.5rem;
    font-weight: 800;
    text-transform: uppercase;
    line-height: 1.2;
    margin-bottom: 0.75rem;
    color: var(--cs-text-primary);
  }

  .cs-mobile-card-visual {
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: 380px;
    margin: 1.25rem auto;
    background-color: var(--cs-surface-alt);
    border: 1px solid var(--cs-border);
    padding: 1rem;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .cs-mobile-card-visual svg {
    width: 100%;
    height: 100%;
    display: block;
  }

  .cs-mobile-card-desc {
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--cs-text-secondary);
    margin-bottom: 1rem;
  }

  .cs-mobile-card-capabilities {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
  }

  .cs-mobile-card-cta {
    width: 100%;
    justify-content: center;
    box-sizing: border-box;
  }
}

/* ==========================================================================
   NO-JAVASCRIPT FALLBACK
   ========================================================================== */
html.no-js .cs-scroll-track {
  display: none;
}

html.no-js .cs-sticky-viewport {
  position: static;
  height: auto;
  max-height: none;
  display: flex;
  flex-direction: column;
}

html.no-js .cs-nav-column,
html.no-js .cs-visual-column,
html.no-js .cs-detail-column {
  display: none;
}

html.no-js .cs-mobile-services-list {
  display: flex !important;
}

/* ==========================================================================
   ACCESSIBILITY: PREFERS-REDUCED-MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .cs-svg-panel,
  .cs-detail-panel,
  .cs-progress-bar-fill,
  .cs-mobile-progress-fill,
  .cs-cta-btn,
  .cs-hero-scroll-trigger svg {
    transition: none !important;
    transform: none !important;
    animation: none !important;
  }
}