:root {
  /* Breakpoints - Mobile First */
  --bp-nokia: 240px;
  --bp-mobile-s: 320px;
  --bp-mobile-m: 375px;
  --bp-mobile-l: 425px;
  --bp-tablet: 768px;
  --bp-laptop: 1024px;
  --bp-desktop: 1440px;
  --bp-wide: 1920px;

  /* Colors - Primary */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-secondary: #047350;
  --color-accent: #f59e0b;

  /* Colors - Text */
  --color-text-primary: #111827;
  --color-text-secondary: #3A424D;
  --color-text-muted: #000;

  /* Colors - Background */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-highlight: #fef3c7;

  /* Colors - UI */
  --color-border: #e5e7eb;
  --color-border-focus: #3b82f6;

  /* Theme colors (ex-apple) */
  --theme-bg: #ffffff;
  --theme-surface: #f5f5f7;
  --theme-text-head: #4b5563;
  --theme-text-body: #626266;
  --theme-accent: #0071e3;
  --theme-accent-hover: #0077ed;

  /* Spacing - Responsive */
  --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
  --space-sm: clamp(0.5rem, 1vw, 0.75rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3vw, 2rem);
  --space-xl: clamp(2rem, 4vw, 3rem);
  --space-2xl: clamp(3rem, 6vw, 4rem);
  --space-3xl: clamp(4rem, 8vw, 6rem);

  /* Container */
  --container-max: min(1200px, calc(100vw - 2rem));
  --container-narrow: min(800px, calc(100vw - 2rem));

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Touch targets */
  --touch-min: 44px;
  --touch-optimal: 48px;

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-display: 'Orbitron', sans-serif;

  /* Z-index scale */
  --z-audio-player: 100;
  --z-modal-messages: 200;
  --z-modal-animation: 300;
}

@media (min-width: 768px) {
  :root {
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
  }
}


body {
  font-size: clamp(0.875rem, 2vw, 1rem);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  font-family: var(--font-primary);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  letter-spacing: -0.025em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 3rem);
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  margin-top: var(--space-2xl);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  margin-top: var(--space-xl);
}

h4 {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
  max-width: 70ch;
}

strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

em {
  font-style: italic;
  color: var(--color-text-secondary);
}

ul {
  list-style: none;
  margin-bottom: var(--space-lg);
}

ul li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: 700;
  font-size: 1.25em;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: all var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration-thickness: 2px;
}

a:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

figure {
  margin: var(--space-xl) 0;
  text-align: center;
}

img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  height: auto;
  max-width: 100%;
}

figcaption {
  margin-top: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-style: italic;
}

dl {
  margin: var(--space-lg) 0;
}

dt {
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
  font-size: 1.0625rem;
}

dd {
  margin-left: var(--space-lg);
  color: var(--color-text-secondary);
  padding-left: var(--space-md);
  border-left: 3px solid var(--color-border);
}

aside {
  background-color: #eff6ff;
  border-left: 4px solid var(--color-primary);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  border-radius: var(--radius-md);
}

aside p {
  margin-bottom: 0;
  color: var(--color-text-primary);
}

aside strong {
  color: var(--color-primary);
}

::selection {
  background-color: var(--color-primary);
  color: white;
}

button,
[role="button"] {
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  background: transparent;
  font-family: inherit;
  min-height: var(--touch-min);
  padding: 0.75rem 1.5rem;
}

button:hover,
[role="button"]:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

button:active,
[role="button"]:active {
  transform: translateY(0);
}

main {
  max-width: var(--container-max);
  margin: 0 auto;
}

.trs{transition:opacity 0.8s ease-in-out;}

.trs2{transition:all 0.3s ease;}

@media (max-width: 240px) {
  body {
    font-size: 0.75rem;
  }
  
  h1 {
    font-size: 1.25rem;
  }
  
  h2 {
    font-size: 1.125rem;
  }
  
  h3, h4 {
    font-size: 1rem;
  }
}