/* ==========================================================================
   SMART ART HERITAGE V1.0 - CORE DESIGN SYSTEM
   High-craft Editorial Architectural Aesthetic & Heritage Digital Ecosystem
   ========================================================================== */

:root {
  /* Warm Travertine & Limestone Editorial Palette */
  --bg-sand: #f8f6f0;
  --bg-cream: #f4efe6;
  --bg-surface: #ffffff;
  --bg-card: #fdfbf7;
  --bg-card-alt: #f0eae1;
  --bg-dark: #141413;
  --bg-dark-card: #1f1f1d;
  --bg-dark-subtle: #272724;

  /* Typography Colors */
  --text-primary: #171716;
  --text-secondary: #57554f;
  --text-muted: #8a877e;
  --text-light: #f6f4ee;
  --text-light-muted: #aca99f;

  /* Architectural & Heritage Accents */
  --accent-terra: #c46238;
  --accent-gold: #c89547;
  --accent-wood: #7c4c28;
  --accent-olive: #435c4b;
  --accent-stone: #a39e93;

  /* Borders & Dividers */
  --border-subtle: #e7e2d7;
  --border-light: #ded6c8;
  --border-strong: #bbb2a2;
  --border-dark: #2c2c29;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(20, 20, 19, 0.04);
  --shadow-md: 0 8px 24px -4px rgba(20, 20, 19, 0.07), 0 2px 6px rgba(20, 20, 19, 0.03);
  --shadow-lg: 0 20px 48px -8px rgba(20, 20, 19, 0.12), 0 4px 12px rgba(20, 20, 19, 0.04);
  --shadow-xl: 0 32px 64px -12px rgba(20, 20, 19, 0.18);
  --shadow-float: 0 16px 40px rgba(0, 0, 0, 0.14);

  /* Radii */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --transition-fast: 0.18s var(--ease-out);
  --transition-normal: 0.35s var(--ease-out);
  --transition-slow: 0.6s var(--ease-out);

  /* Layout */
  --container-max: 1360px;
  --header-height: 72px;
}

/* Base Styles & Custom Browser Surfaces */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-sand);
  color: var(--text-primary);
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
  background-color: var(--bg-sand);
  selection-background-color: var(--text-primary);
  selection-color: var(--bg-sand);
}

::selection {
  background: var(--text-primary);
  color: var(--bg-sand);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-sand);
}
::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

/* Focus Outline */
:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 3px;
}

/* Typography Scale */
h1, h2, h3, h4, .display-font {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.text-eyebrow {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
}

@media (max-width: 768px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }
}

/* ==========================================================================
   TOP NOTIFICATION & GLOBAL BAR
   ========================================================================== */
.global-bar {
  background: var(--text-primary);
  color: #f1ede5;
  font-size: 0.8125rem;
  padding: 8px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  letter-spacing: 0.02em;
}

.global-bar a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.mode-pills {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #2a2a27;
  padding: 3px;
  border-radius: var(--radius-full);
}

.mode-pill {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: transparent;
  color: #bcb8ae;
  transition: var(--transition-fast);
}

.mode-pill.active {
  background: #ffffff;
  color: var(--text-primary);
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 246, 240, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-normal);
}

.nav-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 2px;
}

.brand-logo-text span.stylized-a {
  display: inline-block;
  transform: translateY(-1px);
}

.brand-tag {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-card-alt);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
  position: relative;
  padding: 6px 0;
  cursor: pointer;
  background: none;
  border: none;
}

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

.nav-link .badge-count {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-left: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-pill-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--text-primary);
  color: #ffffff;
  padding: 10px 14px 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-normal);
  box-shadow: 0 4px 14px rgba(20, 20, 19, 0.15);
}

.btn-pill-cta:hover {
  background: #2b2b28;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(20, 20, 19, 0.2);
}

.btn-pill-cta .btn-icon-circle {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #ffffff;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: transform 0.25s var(--ease-out);
}

.btn-pill-cta:hover .btn-icon-circle {
  transform: translate(2px, -2px);
}

.btn-outline-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  padding: 9px 18px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border-strong);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-outline-pill:hover {
  background: var(--bg-surface);
  border-color: var(--text-primary);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-primary);
}

/* ==========================================================================
   HERO SECTION (SIGNATURE ARCHITECTURAL LAYOUT)
   ========================================================================== */
.hero-wrapper {
  padding-top: 24px;
  padding-bottom: 56px;
}

.hero-card {
  position: relative;
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  position: relative;
}

.hero-visual-frame {
  position: relative;
  width: 100%;
  height: min(78vh, 660px);
  min-height: 540px;
  overflow: hidden;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  background-color: #232220;
}

.hero-image-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  filter: brightness(0.95);
  transition: transform 1.4s var(--ease-out);
}

.hero-card:hover .hero-image-bg {
  transform: scale(1.03);
}

.hero-overlay-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20,20,19,0.38) 0%, rgba(20,20,19,0.06) 30%, rgba(20,20,19,0.02) 48%, rgba(20,20,19,0.82) 100%);
  pointer-events: none;
}

/* Floating Spotlight Card (Middle Right of Hero) */
.floating-spotlight-card {
  position: absolute;
  top: 26px;
  right: 28px;
  left: auto;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  padding: 10px 14px 10px 10px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow-float);
  border: 1px solid rgba(255, 255, 255, 0.8);
  max-width: 320px;
  cursor: pointer;
  transition: var(--transition-normal);
  z-index: 10;
}

.floating-spotlight-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.18);
}

.spotlight-thumb {
  width: 90px;
  height: 75px;
  border-radius: var(--radius-md);
  object-fit: cover;
  flex-shrink: 0;
}

.spotlight-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.spotlight-title {
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

.spotlight-badges {
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-pill-dark {
  background: var(--text-primary);
  color: #ffffff;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: var(--radius-full);
}

.badge-pill-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--text-primary);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border-radius: var(--radius-full);
}

/* Ghost editorial watermark (top-left) */
.hero-ghost-word {
  position: absolute;
  top: 22px;
  left: 30px;
  z-index: 4;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: clamp(2.6rem, 7.5vw, 6.5rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(255, 255, 255, 0.75);
  pointer-events: none;
  user-select: none;
}

/* Hero Content (Bottom Left) */
.hero-content {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 6;
  padding: 44px 44px 40px;
  max-width: 880px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: #f1d084;
  margin-bottom: 16px;
}

.hero-headline {
  font-size: clamp(1.9rem, 4.2vw, 3.4rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin: 0 0 16px;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
}

.hero-sub {
  margin: 0;
  max-width: 560px;
  font-size: 0.98rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.88);
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.3);
}

.hero-ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 26px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-radius: 999px;
  padding: 14px 26px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.hero-cta-gold {
  background: var(--accent-gold);
  color: #171716;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.28);
}

.hero-cta-gold:hover {
  background: #d9a94f;
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.32);
}

.hero-cta-ghost {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1.5px solid rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hero-cta-ghost:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-2px);
}

.hero-cta-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.14);
  font-size: 0.8rem;
}

.hero-cta-ghost .hero-cta-icon {
  background: rgba(255, 255, 255, 0.2);
}

/* Quick Hero Stats & Golden Rule */
.hero-substrip {
  background: var(--bg-surface);
  padding: 30px 44px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.hero-substrip-meta {
  display: flex;
  align-items: center;
}

.meta-counter {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.meta-counter + .meta-counter {
  margin-left: 36px;
  padding-left: 36px;
  border-left: 1px solid var(--border-subtle);
}

.counter-num {
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.counter-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-principle {
  display: none;
}

/* ==========================================================================
   ANALYTICAL 3D DIAGRAMS SECTION (TOP RIGHT OF DRIBBLE SHOT)
   ========================================================================== */
.analytical-section {
  padding: 40px 0 70px;
}

.section-head-minimal {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
}

.section-head-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.diagram-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.diagram-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.diagram-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.diagram-preview-box {
  width: 100%;
  height: 220px;
  background: #fbfaf6;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border: 1px solid var(--border-subtle);
}

.diagram-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 10px;
  transition: transform 0.4s var(--ease-out);
}

.diagram-card:hover .diagram-img {
  transform: scale(1.05);
}

.diagram-tag-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}

.diagram-bullet {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-terra);
}

.diagram-category {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.diagram-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.diagram-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 18px;
}

.diagram-link {
  margin-top: auto;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}

.diagram-link svg {
  transition: transform 0.2s ease;
}

.diagram-card:hover .diagram-link svg {
  transform: translateX(4px);
}

/* ==========================================================================
   SELECTED WORK / HERITAGE COLLECTION (BOTTOM RIGHT OF DRIBBBLE SHOT)
   ========================================================================== */
.selected-work-section {
  padding: 40px 0 80px;
}

.selected-work-header {
  margin-bottom: 40px;
}

.selected-work-headline {
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  max-width: 820px;
  margin-bottom: 14px;
}

.selected-work-subline {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 650px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px 24px;
}

.project-card {
  display: flex;
  flex-direction: column;
  cursor: pointer;
  group: project;
}

.project-meta-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.project-code-title {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.project-year {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
}

.project-photo-wrapper {
  position: relative;
  width: 100%;
  height: 310px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: #2b2b29;
}

.project-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out), filter 0.4s ease;
}

.project-card:hover .project-photo {
  transform: scale(1.03);
}

.project-hover-curtain {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(20,20,19,0.7) 100%);
  opacity: 0.6;
  transition: opacity 0.3s ease;
}

.project-card:hover .project-hover-curtain {
  opacity: 0.9;
}

.project-floating-tags {
  position: absolute;
  bottom: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  pointer-events: none;
}

.tag-mini {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  color: var(--text-primary);
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.project-card-footer {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.project-subtitle-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.project-explore-btn {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: none;
  background: none;
  cursor: pointer;
  padding: 4px 0;
}

.project-explore-btn svg {
  transition: transform 0.2s ease;
}

.project-card:hover .project-explore-btn svg {
  transform: translate(2px, -2px);
}

/* ==========================================================================
   MODALS & DRAWERS (FOR 3D VIEWER, HOTSPOTS, 3-2-1, AI 5A, DASHBOARD)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(18, 18, 17, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
}

.modal-backdrop.is-active {
  display: flex;
  opacity: 1;
}

.modal-sheet {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 1060px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  border: 1px solid var(--border-light);
  transform: translateY(20px) scale(0.98);
  transition: transform 0.3s var(--ease-out);
}

.modal-backdrop.is-active .modal-sheet {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: 20px 28px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fdfcf9;
}

.modal-title-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 700;
}

.modal-subtitle {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.modal-close-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-light);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--text-primary);
  color: #ffffff;
  border-color: var(--text-primary);
}

.modal-body {
  padding: 28px;
  overflow-y: auto;
  flex: 1;
}

/* ==========================================================================
   3D ARCHITECTURAL VIEWER STYLING
   ========================================================================== */
.viewer-3d-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 24px;
  height: 600px;
}

.viewer-3d-stage {
  position: relative;
  background: radial-gradient(circle at center, #2e2e2a 0%, #171716 100%);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

#threeCanvasContainer {
  width: 100%;
  height: 100%;
  cursor: grab;
}

#threeCanvasContainer:active {
  cursor: grabbing;
}

.viewer-3d-toolbar {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  gap: 8px;
  z-index: 10;
}

.tool-btn {
  background: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tool-btn:hover, .tool-btn.active {
  background: #ffffff;
  color: var(--text-primary);
}

.viewer-3d-hotspot-indicator {
  position: absolute;
  bottom: 16px;
  left: 16px;
  right: 16px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  color: #f6f4ee;
  font-size: 0.8125rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid rgba(255,255,255,0.15);
}

.viewer-3d-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
  padding-right: 6px;
}

.hotspot-chip-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: left;
  cursor: pointer;
  transition: var(--transition-fast);
}

.hotspot-chip-btn:hover, .hotspot-chip-btn.active {
  border-color: var(--text-primary);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

.hotspot-chip-no {
  font-size: 0.6875rem;
  font-weight: 800;
  color: var(--accent-terra);
  margin-bottom: 2px;
}

.hotspot-chip-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.hotspot-chip-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* ==========================================================================
   HERITAGE EXPLORER & 15-PHOTO HOTSPOT LAB
   ========================================================================== */
.heritage-selector-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 14px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.heritage-tab-pill {
  white-space: nowrap;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.heritage-tab-pill.active {
  background: var(--text-primary);
  color: #ffffff;
  border-color: var(--text-primary);
}

.hotspots-masonry {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.hotspot-detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.hotspot-detail-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.hotspot-card-photo {
  width: 100%;
  height: 190px;
  object-fit: cover;
}

.hotspot-card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.hotspot-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hotspot-card-no {
  font-size: 0.6875rem;
  font-weight: 800;
  color: var(--accent-terra);
  letter-spacing: 0.08em;
}

.hotspot-card-h4 {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.35;
}

.hotspot-accordion {
  border-top: 1px solid var(--border-subtle);
  padding-top: 8px;
}

.hotspot-accordion details {
  margin-bottom: 6px;
}

.hotspot-accordion summary {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--accent-olive);
  cursor: pointer;
  padding: 4px 0;
  list-style: none;
}

.hotspot-accordion details[open] summary {
  color: var(--text-primary);
}

.hotspot-drawer-content {
  background: #f7f3eb;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 4px;
}

/* ==========================================================================
   3-2-1 INTERACTIVE REFLECTION FORM
   ========================================================================== */
.form-321-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
}

.student-card-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background: #ffffff;
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--text-primary);
  outline: none;
}

.form-textarea {
  min-height: 96px;
  resize: vertical;
}

.steps-321-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-card-321 {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.step-header-321 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.step-badge-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--text-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9375rem;
  font-weight: 800;
  flex-shrink: 0;
}

.step-header-text h3 {
  font-size: 1.0625rem;
  font-weight: 700;
}

.step-header-text p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.autosave-pill {
  font-size: 0.75rem;
  font-weight: 600;
  color: #3b744d;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   AI 5A ART ASSISTANT STUDIO
   ========================================================================== */
.ai5a-studio-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  height: 600px;
}

.ai5a-stepper-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ai5a-step-item {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
}

.ai5a-step-item.active {
  background: #ffffff;
  border-color: var(--border-light);
  box-shadow: var(--shadow-sm);
}

.ai5a-step-code {
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--accent-gold);
}

.ai5a-step-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}

.ai5a-step-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.ai5a-chat-stage {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.ai5a-chat-history {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chat-bubble {
  max-width: 80%;
  padding: 14px 18px;
  border-radius: 16px;
  font-size: 0.9375rem;
  line-height: 1.55;
}

.chat-bubble.ai {
  align-self: flex-start;
  background: #f6f3ec;
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.chat-bubble.user {
  align-self: flex-end;
  background: var(--text-primary);
  color: #ffffff;
  border-bottom-right-radius: 4px;
}

.ai-suggestions-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.chip-suggestion {
  background: #ffffff;
  border: 1px solid var(--border-strong);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78125rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.chip-suggestion:hover {
  background: var(--text-primary);
  color: #ffffff;
}

.ai5a-input-bar {
  padding: 14px 18px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  gap: 12px;
  background: #fbf9f5;
}

/* ==========================================================================
   CANVAS CREATIVE STUDIO & PORTFOLIO
   ========================================================================== */
.canvas-studio-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 24px;
}

.canvas-board-wrapper {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.canvas-tools-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.color-swatches {
  display: flex;
  gap: 8px;
}

.swatch-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 1px var(--border-light);
  cursor: pointer;
  transition: transform 0.2s;
}

.swatch-btn.active {
  transform: scale(1.15);
  box-shadow: 0 0 0 2px var(--text-primary);
}

#artCanvas {
  width: 100%;
  height: 420px;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: crosshair;
  touch-action: none;
}

/* ==========================================================================
   TEACHER DASHBOARD & CHARTS
   ========================================================================== */
.dashboard-kpi-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
}

.kpi-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.kpi-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.chart-comparison-box {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.chart-bars-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
}

.chart-bar-row {
  display: grid;
  grid-template-columns: 180px 1fr 60px;
  align-items: center;
  gap: 14px;
}

.bar-track {
  background: #f0ece3;
  height: 22px;
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  display: flex;
}

.bar-pre {
  background: #a8a49a;
  height: 100%;
  border-radius: var(--radius-full) 0 0 var(--radius-full);
}

.bar-post {
  background: var(--accent-olive);
  height: 100%;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

/* Student Table */
.student-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.student-data-table th {
  padding: 12px 14px;
  border-bottom: 2px solid var(--border-light);
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.student-data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.badge-status {
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
}

.badge-status.done {
  background: #e1f0e5;
  color: #2b6337;
}

.badge-status.pending {
  background: #fcf1d8;
  color: #8c6418;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background: #171716;
  color: #d1cdc4;
  padding: 70px 0 40px;
  border-top: 1px solid var(--border-dark);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 50px;
}

.footer-brand h4 {
  color: #ffffff;
  font-size: 1.25rem;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.875rem;
  color: #8e8a80;
  line-height: 1.6;
}

.footer-col h5 {
  color: #ffffff;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: #aca79c;
  text-decoration: none;
  font-size: 0.875rem;
  transition: var(--transition-fast);
}

.footer-col a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #282825;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: #726e65;
}

/* ==========================================================================
   RESPONSIVE QUERIES
   ========================================================================== */
@media (max-width: 1024px) {
  .diagram-cards-grid {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .viewer-3d-layout, .canvas-studio-grid, .ai5a-studio-layout, .form-321-grid {
    grid-template-columns: 1fr;
    height: auto;
  }
  .hero-visual-frame {
    height: 480px;
    min-height: 0;
  }
  .hero-content {
    padding: 34px 30px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-outline-pill {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-visual-frame {
    height: 420px;
    min-height: 0;
  }
  .floating-spotlight-card {
    position: static;
    transform: none;
    margin: 16px;
    max-width: none;
  }
  .hero-ghost-word {
    display: none;
  }
  .hero-content {
    padding: 26px 20px 30px;
  }
  .hero-headline {
    font-size: 1.8rem;
  }
  .hero-substrip {
    padding: 24px 18px;
  }
  .meta-counter + .meta-counter {
    margin-left: 20px;
    padding-left: 20px;
  }

  .dashboard-kpi-row {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ==========================================================================
   HOMEPAGE REDESIGN — Journey steps + Heritage strip
   ========================================================================== */
.hp-eyebrow {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent-terra);
  margin-bottom: 14px;
}

/* ---------- Journey (light museum band) ---------- */
.hp-journey {
  padding: 96px 0 80px;
  background: var(--bg-cream);
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--border-subtle);
}
.hp-journey::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(196, 98, 56, 0.08), transparent 60%),
    radial-gradient(700px 380px at 0% 110%, rgba(200, 149, 71, 0.1), transparent 60%);
  pointer-events: none;
}
.hp-journey .container { position: relative; }
.hp-journey-head { max-width: 640px; margin-bottom: 52px; }
.hp-journey-title {
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: var(--text-primary);
}
.hp-journey-sub {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.hp-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.hp-step {
  position: relative;
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  background: var(--bg-surface);
  padding: 26px 24px 24px;
  cursor: pointer;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.hp-step:hover {
  transform: translateY(-5px);
  border-color: rgba(200, 149, 71, 0.6);
  box-shadow: var(--shadow-lg);
}
.hp-step-num {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: #a2731f;
}
.hp-step-num::after {
  content: "";
  display: block;
  width: 34px;
  height: 2px;
  margin-top: 10px;
  background: linear-gradient(90deg, var(--accent-terra), transparent);
}
.hp-step-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}
.hp-step-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-primary);
}
.hp-step-desc {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-secondary);
  flex: 1;
}
.hp-step-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #a2731f;
}
.hp-step:hover .hp-step-link { color: var(--accent-terra); }

/* ---------- Heritage strip ---------- */
.hp-heritage { padding: 84px 0 96px; background: var(--bg-sand); }
.hp-heritage-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.hp-heritage-title {
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--text-primary);
}
.hp-heritage-all {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
  border: 1.5px solid var(--border-strong);
  border-radius: 999px;
  padding: 11px 20px;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.hp-heritage-all:hover {
  border-color: var(--accent-terra);
  color: var(--accent-terra);
  background: rgba(196, 98, 56, 0.05);
}
.hp-hgrid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.hp-hcard {
  position: relative;
  display: block;
  border-radius: 18px;
  overflow: hidden;
  aspect-ratio: 3 / 4;
  background: var(--bg-card-alt);
  border: 1px solid var(--border-subtle);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.hp-hcard:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.hp-hcard img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.hp-hcard:hover img { transform: scale(1.06); }
.hp-hcard::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 42%, rgba(20, 20, 19, 0.82) 100%);
}
.hp-hcard-body {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 1;
  padding: 16px 16px 15px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.hp-hcard-name {
  font-size: 0.95rem;
  font-weight: 800;
  color: #ffffff;
  transition: color 0.25s ease;
}
.hp-hcard:hover .hp-hcard-name { color: #f1d084; }
.hp-hcard-sub {
  font-size: 0.7rem;
  color: rgba(246, 244, 238, 0.8);
}

@media (max-width: 1024px) {
  .hp-steps { grid-template-columns: repeat(2, 1fr); }
  .hp-hgrid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .hp-journey { padding: 68px 0 52px; }
  .hp-steps { grid-template-columns: 1fr; }
  .hp-hgrid { grid-template-columns: repeat(2, 1fr); }
  .hp-heritage { padding: 60px 0 72px; }
}

/* ==========================================================================
   HOMEPAGE SCROLL REVEAL (progressive enhancement — visible without JS)
   ========================================================================== */
.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.has-reveal [data-reveal].revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .has-reveal [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}