frontend-svelte/src/app/styles/app.css

@import "tailwindcss";
@import "tw-animate-css";

@variant dark (&:where(.dark, .dark *));

:root {
  /* Base font size */
  --font-size: 16px;

  /* GLYPHDIFF Swiss Design System */
  /* Primary Colors */
  --swiss-beige: #f3f0e9;
  --swiss-red: #ff3b30;
  --swiss-black: #1a1a1a;
  --swiss-white: #ffffff;

  /* Neutral Grays */
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;

  /* Dark Mode Backgrounds */
  --dark-bg: #121212;
  --dark-card: #1e1e1e;
  --dark-border: rgba(255, 255, 255, 0.1);

  /* Light Mode Backgrounds */
  --light-bg: #f3f0e9;
  --light-card: #ffffff;
  --light-border: rgba(0, 0, 0, 0.05);

  /* Semantic Colors */
  --color-brand: var(--swiss-red);
  --color-surface: var(--swiss-beige);
  --color-paper: var(--swiss-white);

  /* Base Tailwind Colors (for compatibility) */
  --background: #ffffff;
  --foreground: oklch(0.145 0 0);
  --card: #ffffff;
  --card-foreground: oklch(0.145 0 0);
  --popover: oklch(1 0 0);
  --popover-foreground: oklch(0.145 0 0);
  --primary: #030213;
  --primary-foreground: oklch(1 0 0);
  --secondary: oklch(0.95 0.0058 264.53);
  --secondary-foreground: #030213;
  --muted: #ececf0;
  --muted-foreground: #717182;
  --accent: #e9ebef;
  --accent-foreground: #030213;
  --destructive: #d4183d;
  --destructive-foreground: #ffffff;
  --border: rgba(0, 0, 0, 0.1);
  --input: transparent;
  --input-background: #f3f3f5;
  --switch-background: #cbced4;
  --font-weight-medium: 500;
  --font-weight-normal: 400;
  --ring: oklch(0.708 0 0);
  --chart-1: oklch(0.646 0.222 41.116);
  --chart-2: oklch(0.6 0.118 184.704);
  --chart-3: oklch(0.398 0.07 227.392);
  --chart-4: oklch(0.828 0.189 84.429);
  --chart-5: oklch(0.769 0.188 70.08);
  --radius: 0rem;
  --sidebar: oklch(0.985 0 0);
  --sidebar-foreground: oklch(0.145 0 0);
  --sidebar-primary: #030213;
  --sidebar-primary-foreground: oklch(0.985 0 0);
  --sidebar-accent: oklch(0.97 0 0);
  --sidebar-accent-foreground: oklch(0.205 0 0);
  --sidebar-border: oklch(0.922 0 0);
  --sidebar-ring: oklch(0.708 0 0);

  /* Spacing Scale (rem-based) */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;

  /* Typography Scale */
  --text-2xs: 0.625rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;
  --text-8xl: 6rem;

  /* Comparison Font Sizes */
  --comparison-font-mobile: 3rem;
  --comparison-font-tablet: 4.5rem;
  --comparison-font-desktop: 6rem;
}

.dark {
  --color-surface: var(--dark-bg);
  --color-paper: var(--dark-card);

  --background: oklch(0.145 0 0);
  --foreground: oklch(0.985 0 0);
  --card: oklch(0.145 0 0);
  --card-foreground: oklch(0.985 0 0);
  --popover: oklch(0.145 0 0);
  --popover-foreground: oklch(0.985 0 0);
  --primary: oklch(0.985 0 0);
  --primary-foreground: oklch(0.205 0 0);
  --secondary: oklch(0.269 0 0);
  --secondary-foreground: oklch(0.985 0 0);
  --muted: oklch(0.269 0 0);
  --muted-foreground: oklch(0.708 0 0);
  --accent: oklch(0.269 0 0);
  --accent-foreground: oklch(0.985 0 0);
  --destructive: oklch(0.396 0.141 25.723);
  --destructive-foreground: oklch(0.637 0.237 25.331);
  --border: oklch(0.269 0 0);
  --input: oklch(0.269 0 0);
  --ring: oklch(0.439 0 0);
  --font-weight-medium: 500;
  --font-weight-normal: 400;
  --chart-1: oklch(0.488 0.243 264.376);
  --chart-2: oklch(0.696 0.17 162.48);
  --chart-3: oklch(0.769 0.188 70.08);
  --chart-4: oklch(0.627 0.265 303.9);
  --chart-5: oklch(0.645 0.246 16.439);
  --sidebar: oklch(0.205 0 0);
  --sidebar-foreground: oklch(0.985 0 0);
  --sidebar-primary: oklch(0.488 0.243 264.376);
  --sidebar-primary-foreground: oklch(0.985 0 0);
  --sidebar-accent: oklch(0.269 0 0);
  --sidebar-accent-foreground: oklch(0.985 0 0);
  --sidebar-border: oklch(0.269 0 0);
  --sidebar-ring: oklch(0.439 0 0);
}

@theme {
  --color-background: var(--background);
  --color-foreground: var(--foreground);
  --color-card: var(--card);
  --color-card-foreground: var(--card-foreground);
  --color-popover: var(--popover);
  --color-popover-foreground: var(--popover-foreground);
  --color-primary: var(--primary);
  --color-primary-foreground: var(--primary-foreground);
  --color-secondary: var(--secondary);
  --color-secondary-foreground: var(--secondary-foreground);
  --color-muted: var(--muted);
  --color-muted-foreground: var(--muted-foreground);
  --color-accent: var(--accent);
  --color-accent-foreground: var(--accent-foreground);
  --color-destructive: var(--destructive);
  --color-destructive-foreground: var(--destructive-foreground);
  --color-border: var(--border);
  --color-input: var(--input);
  --color-input-background: var(--input-background);
  --color-switch-background: var(--switch-background);
  --color-ring: var(--ring);
  --color-chart-1: var(--chart-1);
  --color-chart-2: var(--chart-2);
  --color-chart-3: var(--chart-3);
  --color-chart-4: var(--chart-4);
  --color-chart-5: var(--chart-5);
  --radius-sm: 0rem;
  --radius-md: 0rem;
  --radius-lg: 0rem;
  --radius-xl: 0rem;
  --color-sidebar: var(--sidebar);
  --color-sidebar-foreground: var(--sidebar-foreground);
  --color-sidebar-primary: var(--sidebar-primary);
  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
  --color-sidebar-accent: var(--sidebar-accent);
  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
  --color-sidebar-border: var(--sidebar-border);
  --color-sidebar-ring: var(--sidebar-ring);

  --color-swiss-beige: var(--swiss-beige);
  --color-swiss-red: var(--swiss-red);
  --color-swiss-black: var(--swiss-black);
  --color-swiss-white: var(--swiss-white);
  --color-brand: var(--color-brand);
  --color-surface: var(--color-surface);
  --color-paper: var(--color-paper);
  --color-dark-bg: var(--dark-bg);
  --color-dark-card: var(--dark-card);

  --font-logo: 'Syne', system-ui, -apple-system, 'Segoe UI', Inter, Roboto, Arial, sans-serif;
  --font-mono: 'Space Mono', monospace;
  --font-primary: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', Inter, Roboto, Arial, sans-serif;
  --font-secondary: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
}

@layer base {
  * {
    @apply border-border outline-ring/50;
  }

  body {
    @apply bg-background text-foreground;
    font-family: "Karla", system-ui, -apple-system, "Segoe UI", Inter, Roboto, Arial, sans-serif;
    font-optical-sizing: auto;
  }

  html {
    font-size: var(--font-size);
  }

  h1 {
    font-size: var(--text-2xl);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
  }

  h2 {
    font-size: var(--text-xl);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
  }

  h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
  }

  h4 {
    font-size: var(--text-base);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
  }

  label {
    font-size: var(--text-base);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
  }

  button {
    font-size: var(--text-base);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
  }

  input {
    font-size: var(--text-base);
    font-weight: var(--font-weight-normal);
    line-height: 1.5;
  }
}

/* Global utility - useful across your app */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Performance optimization for collapsible elements */
[data-state="open"] {
    will-change: height;
}

/* Smooth focus transitions - good globally */
.peer:focus-visible ~ * {
    transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes nudge {
    0%, 100% {
        transform: translateY(0) scale(1) rotate(0deg);
    }
    2% {
        transform: translateY(-2px) scale(1.1) rotate(-1deg);
    }
    4% {
        transform: translateY(0) scale(1) rotate(1deg);
    }
    6% {
        transform: translateY(-2px) scale(1.1) rotate(0deg);
    }
    8% {
        transform: translateY(0) scale(1) rotate(0deg);
    }
}

.animate-nudge {
    animation: nudge 10s ease-in-out infinite;
}

* {
    scrollbar-width: thin;
    scrollbar-color: hsl(0 0% 70% / 0.4) transparent;
}

.dark * {
    scrollbar-color: hsl(0 0% 40% / 0.5) transparent;
}

/* ---- Webkit / Blink ---- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: hsl(0 0% 70% / 0);
    border-radius: 3px;
    transition: background 0.2s ease;
}

/* Show thumb when container is hovered or actively scrolling */
:hover > ::-webkit-scrollbar-thumb,
::-webkit-scrollbar-thumb:hover,
*:hover::-webkit-scrollbar-thumb {
    background: hsl(0 0% 70% / 0.4);
}

::-webkit-scrollbar-thumb:hover {
    background: hsl(0 0% 50% / 0.6);
}

::-webkit-scrollbar-thumb:active {
    background: hsl(0 0% 40% / 0.8);
}

::-webkit-scrollbar-corner {
    background: transparent;
}

/* Dark mode */
.dark ::-webkit-scrollbar-thumb {
    background: hsl(0 0% 40% / 0);
}

.dark :hover > ::-webkit-scrollbar-thumb,
.dark ::-webkit-scrollbar-thumb:hover,
.dark *:hover::-webkit-scrollbar-thumb {
    background: hsl(0 0% 40% / 0.5);
}

.dark ::-webkit-scrollbar-thumb:hover {
    background: hsl(0 0% 55% / 0.6);
}

.dark ::-webkit-scrollbar-thumb:active {
    background: hsl(0 0% 65% / 0.7);
}

/* ---- Behavior ---- */
* {
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    overscroll-behavior-y: none;
}