/* ==========================================================================
   Mac Duo — Design System Tokens & Aesthetics
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Menlo", "Monaco", monospace;

  /* Color Palette */
  --color-paper: #fbfbfe;
  --color-paper-raised: #ffffff;
  --color-ink: #100f1a;
  --color-ink-soft: #585767;
  --color-ink-faint: #8a8999;
  --color-rule: rgba(16, 15, 26, 0.08);
  --color-rule-subtle: rgba(16, 15, 26, 0.04);
  --color-accent: #2563eb;
  --color-accent-light: #3b82f6;
  --color-well: #0c0d12;
  --color-well-surface: #171922;
  --color-well-border: rgba(255, 255, 255, 0.1);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(16, 15, 26, 0.05);
  --shadow-md: 0 12px 30px -10px rgba(16, 15, 26, 0.12);
  --shadow-lg: 0 24px 60px -20px rgba(16, 15, 26, 0.25);
  --shadow-well: 0 24px 60px -30px rgba(16, 15, 26, 0.55);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Layout */
  --max-width: 1040px;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--color-paper);
  color: var(--color-ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Typography Helpers */
.eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

h1, h2, h3, h4 {
  color: var(--color-ink);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   Header & Sticky Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 251, 254, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-rule);
  transition: background 0.3s, border-color 0.3s;
  height: 48px;
  display: flex;
  align-items: center;
}

.header-inner {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  white-space: nowrap !important;
  flex-shrink: 0;
  line-height: 1;
}

.brand-link span {
  white-space: nowrap !important;
}

.brand-icon {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-shrink: 0;
  white-space: nowrap !important;
}

.nav-link {
  font-size: 0.84rem;
  color: var(--color-ink-soft);
  transition: color 0.2s;
  white-space: nowrap !important;
  flex-shrink: 0;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background-color: var(--color-ink);
  color: #ffffff;
  padding: 0.38rem 0.55rem 0.38rem 0.95rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap !important;
  flex-shrink: 0;
  line-height: 1;
  transition: transform 0.2s, background-color 0.2s, box-shadow 0.2s;
}

.btn-primary span {
  white-space: nowrap !important;
}

.btn-primary:hover {
  background-color: #1e1d2d;
  transform: scale(1.02);
  box-shadow: 0 4px 14px rgba(16, 15, 26, 0.18);
}

.price-badge {
  background: rgba(255, 255, 255, 0.18);
  padding: 0.18rem 0.45rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap !important;
}

.btn-github-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.75rem;
  border-radius: var(--radius-full);
  background-color: rgba(16, 15, 26, 0.05);
  border: 1px solid var(--color-rule);
  color: var(--color-ink);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap !important;
  flex-shrink: 0;
  line-height: 1;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
}

.btn-github-nav:hover {
  background-color: var(--color-ink);
  color: #ffffff;
  border-color: var(--color-ink);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(16, 15, 26, 0.16);
}

.btn-github-nav .github-icon {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.btn-github-nav:hover .github-icon {
  transform: scale(1.08);
}

.mobile-nav {
  display: none;
  background: rgba(251, 251, 254, 0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-rule);
  padding: 0.6rem 1.5rem;
  overflow-x: auto;
  white-space: nowrap;
}

.mobile-nav-inner {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8125rem;
}

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

.hero-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4.5rem 1.5rem 3.5rem;
  text-align: center;
}

.hero-content {
  max-width: 680px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.08;
  color: var(--color-ink);
}

.hero-subtitle {
  margin-top: 1.25rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.6;
  color: var(--color-ink-soft);
  font-weight: 400;
}

.hero-cta-group {
  margin-top: 2.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.hero-btn {
  padding: 0.85rem 1rem 0.85rem 2rem;
  font-size: 1.0625rem;
}

.btn-github-hero {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  background-color: #ffffff;
  border: 1px solid rgba(16, 15, 26, 0.12);
  color: var(--color-ink);
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 500;
  box-shadow: 0 1px 3px rgba(16, 15, 26, 0.06);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
}

.btn-github-hero:hover {
  background-color: #ffffff;
  border-color: rgba(16, 15, 26, 0.32);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(16, 15, 26, 0.1);
  color: var(--color-ink);
}

.btn-github-hero .github-icon {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.btn-github-hero:hover .github-icon {
  transform: scale(1.08);
}

.hero-guarantee {
  font-size: 0.8125rem;
  color: var(--color-ink-soft);
}

.hero-counter {
  margin-top: 2.25rem;
}

.counter-num {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

.counter-label {
  font-size: 0.875rem;
  color: var(--color-ink-faint);
  margin-top: 0.15rem;
}

/* Hero Showcase */
.hero-media-wrapper {
  margin-top: 3.5rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--color-well);
  border: 1px solid rgba(16, 15, 26, 0.08);
  position: relative;
  aspect-ratio: 16 / 9;
  cursor: pointer;
  transition: transform 0.3s;
}

.hero-media-wrapper:hover {
  transform: scale(1.008);
}

.hero-media-wrapper img,
.hero-media-wrapper video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.expand-badge {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
}

.media-caption {
  margin-top: 0.85rem;
  font-size: 0.875rem;
  color: var(--color-ink-faint);
}

/* ==========================================================================
   Section Common
   ========================================================================== */

.content-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4.5rem 1.5rem;
  scroll-margin-top: 5rem;
}

.section-header {
  margin-bottom: 3rem;
}

.section-title {
  font-size: clamp(1.85rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: 0.65rem;
}

.section-intro {
  margin-top: 1rem;
  font-size: 1.0625rem;
  color: var(--color-ink-soft);
  max-width: 600px;
}

/* ==========================================================================
   Interactive Feature 01: Draggable 3D Clamshell Fold
   ========================================================================== */

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
  margin-bottom: 4.5rem;
}

.feature-reverse {
  direction: rtl;
}

.feature-reverse > * {
  direction: ltr;
}

.step-num {
  font-size: 0.9375rem;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-faint);
  font-weight: 500;
}

.feature-title {
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-top: 0.5rem;
}

.feature-desc {
  margin-top: 1rem;
  color: var(--color-ink-soft);
  font-size: 1rem;
  line-height: 1.65;
}

/* Interactive Clamshell Container */
.interactive-stage {
  background: var(--color-well);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem 1.75rem;
  box-shadow: var(--shadow-well);
  border: 1px solid var(--color-well-border);
  position: relative;
  user-select: none;
  cursor: ns-resize;
}

.clamshell-viewport {
  perspective: 1300px;
  perspective-origin: 50% 100%;
  width: 100%;
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.laptop-screen-frame {
  width: 100%;
  height: 100%;
  transform-origin: bottom center;
  transform-style: preserve-3d;
  background: #252830;
  border-radius: 10px 10px 0 0;
  padding: 7px 7px 0;
  position: relative;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.4);
  transition: transform 0.05s linear;
}

.laptop-notch {
  position: absolute;
  top: 7px;
  left: 50%;
  transform: translateX(-50%);
  width: 16%;
  height: 10px;
  background: #252830;
  border-radius: 0 0 4px 4px;
  z-index: 10;
}

.display-surface {
  width: 100%;
  height: 100%;
  background: #000000;
  border-radius: 6px 6px 0 0;
  overflow: hidden;
  position: relative;
}

/* Dynamic Desktop Graphic */
.desktop-wallpaper {
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, #1e3a8a 0%, #3b82f6 40%, #7c3aed 75%, #db2777 100%);
  overflow: hidden;
}

.mock-window-1 {
  position: absolute;
  top: 15%;
  left: 8%;
  width: 50%;
  height: 55%;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  padding: 8px;
}

.mock-window-header {
  height: 10px;
  background: #e2e8f0;
  border-radius: 3px;
  margin-bottom: 8px;
}

.mock-window-line {
  height: 4px;
  background: #cbd5e1;
  border-radius: 2px;
  margin-bottom: 5px;
}

.mock-window-2 {
  position: absolute;
  top: 25%;
  right: 8%;
  width: 42%;
  height: 52%;
  background: rgba(20, 24, 38, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  padding: 8px;
}

.mock-code-line {
  height: 4px;
  border-radius: 2px;
  margin-bottom: 6px;
}

/* Frosted Glass Overlay */
.frost-layer {
  position: absolute;
  inset: 0;
  backdrop-filter: blur(var(--frost-blur, 0px));
  -webkit-backdrop-filter: blur(var(--frost-blur, 0px));
  background: linear-gradient(to top, transparent 0%, rgba(255, 255, 255, var(--frost-opacity, 0)) 85%);
  mask-image: linear-gradient(to top, transparent 0%, black 85%);
  -webkit-mask-image: linear-gradient(to top, transparent 0%, black 85%);
  pointer-events: none;
}

.grain-layer {
  position: absolute;
  inset: 0;
  opacity: var(--grain-opacity, 0);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.4'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
  pointer-events: none;
}

.hinge-glint {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1.5px;
  background: rgba(255, 255, 255, 0.4);
  opacity: var(--hinge-opacity, 0);
}

.laptop-chassis-base {
  width: 100%;
  height: 14px;
  background: linear-gradient(180deg, #333742 0%, #1a1c22 100%);
  clip-path: polygon(0 0, 100% 0, 96% 100%, 4% 100%);
  margin-top: 2px;
}

.stage-footer {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.45);
}

.stage-hint {
  position: absolute;
  top: 1rem;
  left: 1.25rem;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.4);
  pointer-events: none;
}

/* Preset Buttons */
.preset-group {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
}

.preset-btn {
  flex: 1;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.45rem;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

.preset-btn.active {
  background: #ffffff;
  color: var(--color-ink);
  font-weight: 600;
}

/* ==========================================================================
   "The App" Showcase
   ========================================================================== */

.app-showcase-card {
  background: var(--color-paper-raised);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
}

.app-image-container {
  margin-top: 2.5rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(16, 15, 26, 0.08);
}

.app-image-container img {
  width: 100%;
  display: block;
}

/* ==========================================================================
   Details / Before You Buy Section
   ========================================================================== */

.details-card {
  background: var(--color-paper-raised);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  margin-bottom: 1.5rem;
}

.details-dl {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
}

.details-row {
  display: grid;
  grid-template-columns: 12rem 1fr;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-rule);
}

.details-row:last-child {
  border-bottom: none;
}

.details-term {
  font-weight: 600;
  color: var(--color-ink);
  font-size: 0.9375rem;
}

.details-desc {
  color: var(--color-ink-soft);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Terminal Compatibility Box */
.terminal-box {
  margin-top: 1rem;
  background: var(--color-well);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border: 1px solid var(--color-well-border);
}

.terminal-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #38bdf8;
  overflow-x: auto;
  white-space: nowrap;
}

.copy-btn {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* ==========================================================================
   Dark Callout Banner
   ========================================================================== */

.dark-callout {
  background: var(--color-well);
  border-radius: var(--radius-xl);
  padding: 4.5rem 2rem;
  text-align: center;
  color: #ffffff;
  margin: 4rem auto;
  max-width: var(--max-width);
  box-shadow: var(--shadow-well);
}

.dark-callout-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.5rem;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.dark-callout-title {
  color: #ffffff;
  font-size: clamp(2rem, 4vw, 2.75rem);
}

.dark-callout-sub {
  color: rgba(255, 255, 255, 0.6);
  margin-top: 0.75rem;
  font-size: 1.05rem;
}

.callout-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.btn-white {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: #ffffff;
  color: var(--color-ink);
  padding: 0.75rem 1rem 0.75rem 1.85rem;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-white:hover {
  background: #f1f5f9;
  transform: scale(1.02);
}

.btn-white .price-badge {
  background: rgba(16, 15, 26, 0.08);
  color: var(--color-ink);
}

.btn-callout-github {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #ffffff;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
}

.btn-callout-github:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.45);
  transform: translateY(-2px);
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.btn-callout-github .github-icon {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.btn-callout-github:hover .github-icon {
  transform: scale(1.08);
}

/* ==========================================================================
   FAQ Accordions
   ========================================================================== */

.faq-list {
  margin-top: 2.5rem;
  border-top: 1px solid var(--color-rule);
}

.faq-item {
  border-bottom: 1px solid var(--color-rule);
  padding: 1.5rem 0;
}

.faq-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  list-style: none;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-ink);
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--color-ink-faint);
  transition: transform 0.25s;
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-body {
  margin-top: 0.85rem;
  font-size: 0.9375rem;
  color: var(--color-ink-soft);
  line-height: 1.65;
  max-width: 720px;
}

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

.site-footer {
  border-top: 1px solid var(--color-rule);
  background: var(--color-paper);
  padding: 3.5rem 1.5rem 4rem;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--color-ink-faint);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

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

.footer-link-github {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.footer-link-github .github-icon {
  transition: transform 0.2s ease;
}

.footer-link-github:hover .github-icon {
  transform: scale(1.15);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 900px) {
  .nav-links .nav-link {
    display: none;
  }

  .mobile-nav {
    display: block;
  }

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

  .feature-reverse {
    direction: ltr;
  }

  .details-row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .app-showcase-card {
    padding: 1.75rem;
  }
}

/* Dual App Windows Showcase */
.app-dual-showcase {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  background: #0d0f17;
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.4);
}

.app-window-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.window-caption {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 1.25rem;
}

.app-window-wrapper img {
  width: 100%;
  max-width: 440px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.08);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s;
}

.app-window-wrapper img:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 50px -10px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(255, 255, 255, 0.16);
}

@media (max-width: 820px) {
  .app-dual-showcase {
    grid-template-columns: 1fr;
    padding: 1.5rem;
    gap: 2.5rem;
  }
}

@media (max-width: 640px) {
  .btn-github-nav .btn-github-text {
    display: none;
  }
  .btn-github-nav {
    padding: 0.6rem;
  }
  .header-inner {
    padding: 0.6rem 1rem;
  }
}