/* ==========================================================================
   CFD JET THEME -- LBM-2D High-Performance C++ Lattice Boltzmann CFD Solver
   Inspired by the Paraview jet colormap and modern dark-terminal aesthetics.
   ========================================================================== */

:root {
  --bg-primary:   #0d1117;
  --bg-card:      #161b22;
  --bg-canvas:    #0a0e14;
  --border:       #21262d;
  --border-light: #30363d;

  --cyan:         #00d4ff;
  --cyan-dim:     #0099cc;
  --cyan-bright:  #33ddff;
  --orange:       #ff6b35;
  --orange-dim:   #cc5529;
  --turquoise:    #00f5d4;
  --green:        #39d353;
  --green-dim:    #2ea043;
  --yellow:       #ffd93d;
  --red:          #ff4757;

  --fg:           #c9d1d9;
  --fg-dim:       #8b949e;
  --fg-muted:     #484f58;

  --terminal:     #39d353;
  --card-bg:      #161b22;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg-primary);
  color: var(--fg);
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  line-height: 1.7;
  padding-left: 0;
  min-height: 100vh;
  font-size: 15px;
  transition: padding-left 0.25s ease;
}
body.sidebar-open { padding-left: 240px; }

h1 { color: var(--cyan); font-size: 1.6em; margin-top: 0; }
h2 { color: var(--orange); font-size: 1.25em; margin: 2em 0 0.8em; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
h3 { color: var(--cyan); font-size: 1.05em; margin: 1.5em 0 0.5em; }
h4 { color: var(--fg); font-size: 0.95em; margin: 1.2em 0 0.4em; }
p { margin-bottom: 1em; font-size: 0.95em; color: var(--fg-dim); }
a { color: var(--cyan); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--cyan-bright); }
code { background: rgba(0,0,0,0.3); padding: 2px 6px; border-radius: 4px; color: var(--orange); font-size: 0.9em; }
pre code { background: none; padding: 0; }
ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.3rem; font-size: 0.9em; color: var(--fg-dim); }
strong { color: var(--fg); }
img { max-width: 100%; border-radius: 4px; border: 1px solid var(--border); }

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: 240px;
  height: 100vh;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  transform: translateX(-240px);
  transition: transform 0.25s ease;
}
.sidebar.open { transform: translateX(0); }

.sidebar-toggle {
  display: block;
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--fg);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 4px;
  font-family: inherit;
}

.sidebar-brand {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand a {
  color: var(--cyan);
  font-size: 0.78em;
  font-weight: 700;
  text-decoration: none;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 0 24px;
  overflow-y: auto;
}

.nav-section { margin-bottom: 20px; }

.nav-heading {
  padding: 4px 20px;
  font-size: 0.55em;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 2px;
}

.nav-item {
  display: block;
  padding: 6px 20px 6px 28px;
  font-size: 0.75em;
  color: var(--fg-dim);
  text-decoration: none;
  transition: all 0.15s;
  border-left: 2px solid transparent;
}

.nav-item:hover {
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.05);
  border-left-color: var(--cyan);
}

.nav-item.active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(0, 212, 255, 0.08);
}

/* --- Main container --- */
.main-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2.5rem 30px 4rem;
}

/* --- Hero --- */
.hero {
  text-align: center;
  padding: 2rem 0 1.5rem;
}

.hero h1 {
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: var(--cyan);
  margin: 0;
  letter-spacing: -0.02em;
}

.hero h1 .accent-orange {
  color: var(--orange);
}

.hero .subtitle {
  max-width: 720px;
  margin: 0.75rem auto 0;
  font-size: 0.8em;
  color: var(--fg-dim);
  line-height: 1.7;
}

.hero .status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 4px 14px;
  border: 1px solid var(--cyan-dim);
  border-radius: 4px;
  font-size: 0.65em;
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.06);
}

.hero .status-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* --- Stats bar --- */
.stats-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 1.5rem 0;
}

.stat-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 18px;
  flex: 1;
  min-width: 100px;
  text-align: center;
  transition: all 0.2s;
}

.stat-item:hover { border-color: var(--border-light); }

.stat-item .num {
  font-size: 1.3em;
  font-weight: 700;
  color: var(--cyan);
  display: block;
}

.stat-item .lbl {
  font-size: 0.65em;
  color: var(--fg-dim);
  margin-top: 4px;
}

/* --- Key results --- */
.key-results { margin: 1.5rem 0; }
.key-results h2 {
  color: var(--cyan);
  font-size: 1.05em;
  margin: 0 0 0.8em;
  border: none;
  padding: 0;
}
.key-results ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.key-results li {
  position: relative;
  padding: 0.35em 0 0.35em 1.4em;
  color: var(--fg-dim);
  font-size: 0.82em;
  line-height: 1.6;
  margin: 0;
}
.key-results li::before {
  content: '\25B8';
  position: absolute;
  left: 0;
  color: var(--cyan);
  font-size: 0.85em;
}
.key-results li strong { color: var(--fg); }

/* Key findings list (compact, bullet style) */
.key-findings {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  display: grid;
  gap: 0.6rem;
}
.key-findings li {
  position: relative;
  padding: 0.5em 0 0.5em 1.6em;
  background: var(--bg-card);
  border-left: 3px solid var(--cyan);
  border-radius: 0 6px 6px 0;
  font-size: 0.85em;
  line-height: 1.6;
  color: var(--fg-dim);
}
.key-findings li::before {
  content: '\25B8';
  position: absolute;
  left: 0.6em;
  color: var(--cyan);
  font-size: 0.85em;
}
.key-findings li strong { color: var(--fg); }

/* --- Callout --- */
.callout {
  background: var(--bg-card);
  border-left: 3px solid var(--orange);
  border-radius: 0 6px 6px 0;
  padding: 14px 18px;
  margin: 1.25rem 0;
  font-size: 0.78em;
  color: var(--fg-dim);
}

.callout strong { color: var(--fg); }
.callout.cyan { border-left-color: var(--cyan); }

/* --- Equation box --- */
.eq-box {
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--orange);
  border-radius: 0 6px 6px 0;
  padding: 16px 20px;
  margin: 1.25rem 0;
  overflow-x: auto;
}

.eq-box .label {
  text-align: right;
  font-size: 0.65em;
  color: var(--fg-muted);
  margin-top: 8px;
}

/* --- Tables --- */
.main-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.85em;
}

.main-content th, .main-content td {
  padding: 8px 12px;
  border: 1px solid var(--border);
  text-align: left;
}

.main-content th {
  background: var(--bg-card);
  color: var(--cyan);
  font-weight: 600;
}

.main-content td { color: var(--fg-dim); }
.main-content tr:hover td { background: rgba(0, 212, 255, 0.03); }

/* --- Code blocks --- */
.main-content pre {
  background: rgba(0,0,0,0.25) !important;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.72em;
  padding: 16px !important;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.main-content :not(pre) > code {
  background: rgba(0,0,0,0.3);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--orange);
  font-size: 0.85em;
  border: 1px solid var(--border);
}

/* --- Simulation viewport --- */
.sim-viewport {
  position: relative;
  background: var(--bg-canvas);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.sim-viewport video {
  width: 100%;
  display: block;
  background: var(--bg-canvas);
}

.sim-viewport canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

/* --- Charts --- */
.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  margin: 1rem 0;
}

.chart-container .chart-title {
  font-size: 0.65em;
  color: var(--fg-muted);
  margin-bottom: 6px;
  padding-left: 4px;
}

/* --- Teaser cards --- */
.teaser-card {
  display: flex;
  gap: 24px;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  border-radius: 0 8px 8px 0;
  padding: 20px 24px;
  margin: 2rem 0;
  transition: border-color 0.2s;
}

.teaser-card:hover { border-color: var(--border-light); }

.teaser-card .teaser-img {
  width: 45%;
  min-width: 200px;
  border-radius: 4px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.teaser-card .teaser-text { flex: 1; }

.teaser-card .teaser-text h3 {
  margin: 0 0 6px;
  color: var(--fg);
  font-size: 1em;
}

.teaser-card .teaser-text p {
  margin: 0 0 10px;
  font-size: 0.82em;
  color: var(--fg-dim);
  line-height: 1.6;
}

/* --- Case grid (3x3 on desktop) --- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 1.5rem 0;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  border-color: var(--cyan-dim);
  transform: translateY(-2px);
}

.case-card .case-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--border);
  background: var(--bg-canvas);
}

.case-card .case-info {
  padding: 14px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.case-card .case-info h3 {
  margin: 0 0 6px;
  color: var(--cyan);
  font-size: 0.85em;
  font-weight: 600;
}

.case-card .case-info p {
  margin: 0 0 10px;
  font-size: 0.72em;
  color: var(--fg-dim);
  line-height: 1.6;
  flex: 1;
}

.case-card .case-info .case-link {
  font-size: 0.68em;
  color: var(--cyan-dim);
  transition: color 0.2s;
}

.case-card:hover .case-info .case-link {
  color: var(--cyan-bright);
}

@media (max-width: 900px) {
  .case-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .case-grid { grid-template-columns: 1fr; }
}

.teaser-link {
  display: inline-block;
  padding: 7px 18px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card);
  color: var(--fg-dim);
  font-size: 0.75em;
  transition: all 0.2s;
  text-decoration: none;
  font-family: inherit;
  cursor: pointer;
}

.teaser-link:hover {
  background: var(--border);
  color: var(--fg);
  border-color: var(--border-light);
}

.teaser-link.active {
  background: var(--border);
  color: var(--cyan);
  border-color: var(--cyan-dim);
}

#reTabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

@media (max-width: 720px) {
  .teaser-card { flex-direction: column; text-align: center; }
  .teaser-card .teaser-img { width: 100%; min-width: 0; }
}

/* --- GitHub link --- */
.github-link {
  display: inline-block;
  margin-top: 14px;
  padding: 8px 20px;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--fg-dim);
  font-size: 0.72em;
  transition: all 0.2s;
  text-decoration: none;
  font-family: inherit;
}
.github-link:hover {
  color: var(--cyan-bright);
  border-color: var(--cyan);
  background: rgba(0, 212, 255, 0.06);
}

/* --- Divider --- */
.divider { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }

/* --- Module table --- */
.module-table {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 1rem 0;
}

.module-row {
  display: grid;
  grid-template-columns: 140px 1fr 100px;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.78em;
  align-items: center;
}

.module-row .mod-name { color: var(--cyan); font-weight: 600; }
.module-row .mod-desc { color: var(--fg-dim); }
.module-row .mod-file { color: var(--fg-muted); font-size: 0.85em; text-align: right; }

/* --- Section intro --- */
.section-intro {
  font-size: 0.95em;
  color: var(--fg-dim);
  line-height: 1.8;
  margin: 1.5rem 0;
  padding: 0 2px;
}
.section-intro strong { color: var(--cyan); }

/* --- Footer --- */
.site-footer {
  text-align: center;
  padding: 1.5rem 20px;
  border-top: 1px solid var(--border);
  font-size: 0.65em;
  color: var(--fg-muted);
}

.site-footer a { color: var(--fg-muted); }
.site-footer a:hover { color: var(--cyan); }

/* --- Responsive --- */
@media (max-width: 900px) {
  body.sidebar-open { padding-left: 0; }
}

@media (max-width: 720px) {
  .main-content { padding: 1.5rem 16px 3rem; }
  .stats-bar { gap: 8px; }
  .stat-item { min-width: 80px; padding: 10px 14px; }
  .stat-item .num { font-size: 1.1em; }
}

/* --- Scroll anchor --- */
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
[id] { scroll-margin-top: 28px; }

/* --- HUD overlay for sim viewer --- */
.sim-hud {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 10;
  pointer-events: none;
}

.sim-hud-line {
  font-size: 0.6em;
  color: var(--cyan);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.6;
  text-shadow: 0 0 4px rgba(0, 212, 255, 0.3);
}

.sim-hud-line .label { color: var(--fg-muted); }
.sim-hud-line .value { color: var(--cyan); }
.sim-hud-line .warn { color: var(--orange); }

/* --- Controls bar (sim viewer) --- */
.sim-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 6px 6px;
}

.sim-controls button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 5px 12px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.72em;
  border-radius: 4px;
  transition: all 0.15s;
}

.sim-controls button:hover { border-color: var(--cyan); color: var(--cyan); }

.sim-controls select {
  background: var(--bg-canvas);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 4px 8px;
  font-family: inherit;
  font-size: 0.72em;
  border-radius: 4px;
  cursor: pointer;
}

.sim-controls input[type="range"] {
  flex: 1;
  accent-color: var(--cyan);
  height: 4px;
  cursor: pointer;
}

.sim-controls .time-display {
  font-size: 0.65em;
  color: var(--fg-dim);
  min-width: 80px;
  text-align: center;
}

/* --- Image row --- */
.img-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 1.5rem 0;
}

.img-row figure { margin: 0; }
.img-row figcaption {
  font-size: 0.72em;
  color: var(--fg-muted);
  margin-top: 4px;
  text-align: center;
}

/* --- Comparison slider --- */
  .vf-split {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-start;
    margin: 1.5rem 0;
  }
  .vf-col {
    flex: 1 1 320px;
    min-width: 280px;
  }
  .vf-col > h4 {
    margin-top: 0;
  }

  /* --- 3x2 grid layout (velocity slider + video / Cp static + video / vorticity static + video) --- */
  .vf-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1.5rem 0;
  }
  @media (max-width: 720px) {
    .vf-grid { grid-template-columns: 1fr; }
  }
  .vf-grid .vf-cell {
    min-width: 0;
    min-height: 0;
    overflow: hidden;
  }
  .vf-grid .vf-cell > h4 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 0.82em;
    color: var(--fg-dim);
  }
  .vf-grid .fv-stage {
    width: 100%;
    background: var(--bg-canvas);
    border: 1px solid var(--border);
    border-radius: 6px;
    line-height: 0;
    padding: 0;
    margin: 0;
    max-width: none;
  }
  .vf-grid .comparison-slider {
    width: 100%;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: ew-resize;
    user-select: none;
    -webkit-user-select: none;
    background: var(--bg-canvas);
    max-width: none;
    margin: 0;
    position: relative;
  }
  .vf-grid .comparison-slider img {
    display: block;
    width: 100%;
    height: auto;
    pointer-events: none;
  }
  .vf-grid .static-field-img {
    width: 100%;
    display: block;
    border: 1px solid var(--border);
    border-radius: 6px;
    max-width: none;
    margin: 0;
  }
  .vf-grid .static-canvas {
    width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-canvas);
    max-width: none;
    display: block;
  }

  .comparison-slider {
   position: relative;
   width: 100%;
   max-width: 560px;
   margin: 0 auto;
   overflow: hidden;
   border: 1px solid var(--border);
   border-radius: 6px;
   cursor: ew-resize;
   user-select: none;
   -webkit-user-select: none;
   background: var(--bg-canvas);
 }

 .comparison-slider img {
   display: block;
   width: 100%;
   height: auto;
   pointer-events: none;
 }

.comparison-slider .img-after {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  clip-path: inset(0 50% 0 0);
}

.comparison-slider .slider-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--pink, #ff79c6);
  z-index: 10;
  pointer-events: none;
}

.comparison-slider .slider-btn {
  position: absolute;
  top: 50%;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--pink, #ff79c6);
  border: 2px solid var(--bg-primary);
  transform: translate(-50%, -50%);
  z-index: 11;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 8px rgba(0,0,0,0.5);
}

.comparison-slider .slider-btn::before,
.comparison-slider .slider-btn::after {
  content: '';
  position: absolute;
  width: 2px;
  height: 10px;
  background: var(--bg-primary);
  border-radius: 1px;
}

.comparison-slider .slider-btn::before {
  transform: translate(-4px, 0);
}

.comparison-slider .slider-btn::after {
  transform: translate(4px, 0);
}

.comparison-slider .slider-label {
  position: absolute;
  bottom: 10px;
  font-size: 0.65em;
  color: var(--fg-dim);
  background: rgba(0,0,0,0.6);
  padding: 3px 10px;
  border-radius: 3px;
  pointer-events: none;
  z-index: 5;
}

.comparison-slider .slider-label.left {
  left: 10px;
}

.comparison-slider .slider-label.right {
  right: 10px;
}

/* ==========================================================================
   Interactive Flow Viewer (LBM vs PINN)
   ========================================================================== */
.fv-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 1rem 0 0.75rem;
}
.fv-tab {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--fg-dim);
  font-family: inherit;
  font-size: 0.72em;
  padding: 7px 14px;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.15s;
}
.fv-tab:hover { border-color: var(--cyan-dim); color: var(--fg); }
.fv-tab.active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04141a;
  font-weight: 700;
}

.fv-stage {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  background: var(--bg-canvas);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  line-height: 0;
}
.fv-canvas {
  width: 100%;
  height: auto;
  display: block;
  image-rendering: auto;
  border-radius: 4px;
  background: #000;
}
.fv-tag {
  position: absolute;
  top: 14px;
  font-size: 0.62em;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--fg);
  background: rgba(0,0,0,0.65);
  padding: 3px 9px;
  border-radius: 3px;
  pointer-events: none;
  z-index: 5;
}
.fv-tag-l { left: 14px; }
.fv-tag-r { right: 14px; }

.fv-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0.7rem auto;
  font-size: 0.8em;
}
.vf-grid .fv-controls {
  max-width: none;
  margin: 0;
}
.fv-group {
  display: flex;
  align-items: center;
  gap: 4px;
}
.fv-label-txt {
  color: var(--fg-dim);
  font-size: 0.78em;
  margin-right: 2px;
}
.fv-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--fg-dim);
  font-family: inherit;
  font-size: 0.82em;
  padding: 5px 11px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}
.fv-btn:hover { border-color: var(--cyan-dim); color: var(--fg); }
.fv-btn.active {
  background: var(--cyan-dim);
  border-color: var(--cyan);
  color: #04141a;
  font-weight: 700;
}
.fv-slider {
  flex: 1;
  min-width: 140px;
  accent-color: var(--cyan);
  cursor: pointer;
}
.fv-frame {
  color: var(--fg-dim);
  font-size: 0.82em;
  min-width: 90px;
  text-align: right;
}
.fv-note {
  max-width: 560px;
  margin: 0.4rem auto 0;
  text-align: center;
  min-height: 1.1em;
  font-size: 0.74em;
  color: var(--cyan-dim);
}

/* ==========================================================================
   Desktop Application Showcase
   ========================================================================== */

/* --- Hero actions --- */
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.82em;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}

.hero-btn.primary {
  background: var(--cyan);
  color: #04141a;
  border: 1px solid var(--cyan);
}

.hero-btn.primary:hover {
  background: var(--cyan-bright);
  border-color: var(--cyan-bright);
  color: #04141a;
}

.hero-btn.secondary {
  background: transparent;
  color: var(--fg-dim);
  border: 1px solid var(--border-light);
}

.hero-btn.secondary:hover {
  border-color: var(--cyan-dim);
  color: var(--cyan);
}

.hero-badges {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 1rem;
  flex-wrap: wrap;
}

/* --- Video grid --- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 1.5rem 0;
}

.video-placeholder {
  position: relative;
  background: linear-gradient(145deg, var(--bg-card), var(--bg-canvas));
  border: 1px dashed var(--border-light);
  border-radius: 8px;
  padding: 2rem 1.5rem;
  text-align: center;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: border-color 0.2s;
}

.video-placeholder:hover {
  border-color: var(--cyan-dim);
}

.video-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.1);
  border: 2px solid var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--cyan);
  margin-bottom: 4px;
}

.video-title {
  font-size: 0.9em;
  font-weight: 600;
  color: var(--fg);
}

.video-duration {
  font-size: 0.7em;
  color: var(--cyan-dim);
  font-family: 'JetBrains Mono', monospace;
}

.video-description {
  font-size: 0.75em;
  color: var(--fg-dim);
  line-height: 1.6;
  max-width: 300px;
}

/* --- Feature gallery --- */
.feature-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin: 1.5rem 0;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 0;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: var(--cyan-dim);
  transform: translateY(-2px);
}

.feature-img-wrap {
  position: relative;
  aspect-ratio: 16 / 10;
  background: var(--bg-canvas);
  overflow: hidden;
}

.feature-img-wrap .screenshot {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border: none;
  border-radius: 0;
}

.feature-img-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, var(--bg-card), var(--bg-canvas));
  color: var(--fg-muted);
  font-size: 0.72em;
  font-family: 'JetBrains Mono', monospace;
  opacity: 0;
  pointer-events: none;
}

.feature-img-wrap.missing .screenshot {
  visibility: hidden;
}

.feature-img-wrap.missing .feature-img-fallback {
  opacity: 1;
}

.feature-card figcaption {
  padding: 16px;
}

.feature-card figcaption h3 {
  margin: 0 0 6px;
  color: var(--cyan);
  font-size: 0.9em;
}

.feature-card figcaption p {
  margin: 0;
  font-size: 0.78em;
  color: var(--fg-dim);
  line-height: 1.6;
}

/* --- Architecture diagram --- */
.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 1.5rem 0;
  max-width: 700px;
}

.arch-layer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  transition: border-color 0.2s;
}

.arch-layer:hover {
  border-color: var(--border-light);
}

.arch-frontend { border-left: 3px solid var(--cyan); }
.arch-middle { border-left: 3px solid var(--orange); }
.arch-backend { border-left: 3px solid var(--turquoise); }

.arch-label {
  font-size: 0.82em;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 8px;
}

.arch-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.arch-chip {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.7em;
  color: var(--cyan-dim);
  font-family: 'JetBrains Mono', monospace;
}

.arch-middle .arch-chip {
  background: rgba(255, 107, 53, 0.08);
  color: var(--orange);
}

.arch-backend .arch-chip {
  background: rgba(0, 245, 212, 0.08);
  color: var(--turquoise);
}

.arch-desc {
  font-size: 0.75em;
  color: var(--fg-dim);
  line-height: 1.5;
}

.arch-arrow {
  text-align: center;
  padding: 8px 0;
  font-size: 0.72em;
  color: var(--fg-muted);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.5px;
}

/* --- Process timeline --- */
.process-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 1.5rem 0;
  position: relative;
}

.process-timeline::before {
  content: '';
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.process-step {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  position: relative;
}

.process-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82em;
  font-weight: 700;
  color: var(--cyan);
  flex-shrink: 0;
  z-index: 1;
  font-family: 'JetBrains Mono', monospace;
}

.process-content {
  flex: 1;
  padding-top: 6px;
}

.process-content h3 {
  margin: 0 0 4px;
  color: var(--fg);
  font-size: 0.95em;
}

.process-content p {
  margin: 0;
  font-size: 0.82em;
  color: var(--fg-dim);
  line-height: 1.7;
}

/* --- Tech grid --- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 1.5rem 0;
}

.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  transition: border-color 0.2s;
}

.tech-card:hover {
  border-color: var(--border-light);
}

.tech-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82em;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
}

.tech-card h3 {
  margin: 0 0 6px;
  color: var(--fg);
  font-size: 0.9em;
}

.tech-card p {
  margin: 0;
  font-size: 0.78em;
  color: var(--fg-dim);
  line-height: 1.6;
}

/* --- Responsive adjustments --- */
@media (max-width: 720px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-btn { width: 100%; max-width: 280px; justify-content: center; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-gallery { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .process-timeline::before { left: 18px; }
  .process-number { width: 36px; height: 36px; font-size: 0.72em; }
}

@media (max-width: 900px) {
  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
  .feature-gallery {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  }
}