@import "tailwindcss";
@import "tw-animate-css";
@import "./fonts.css";

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

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

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

  /* Semantic mode-switching colors. These are redefined inside `.dark`
     so utilities that reference them auto-adapt without a `dark:` variant. */
  --color-border-subtle: var(--neutral-300);
  --color-text-subtle: var(--neutral-500);
  --color-skeleton: var(--neutral-200);
  --color-grid-line: rgb(0 0 0 / 0.03);

  /* 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);

  /* Typography Scale */
  --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);

  /* Dark-mode overrides for the semantic mode-switching colors. */
  --color-border-subtle: rgb(255 255 255 / 0.1);
  --color-text-subtle: var(--neutral-400);
  --color-skeleton: var(--neutral-800);
  --color-grid-line: rgb(255 255 255 / 0.05);

  --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;

  /* Micro typography scale — extends Tailwind's text-xs (0.75rem) downward */
  --text-5xs: 0.4375rem;
  --text-4xs: 0.5rem;
  --text-3xs: 0.5625rem;
  --text-2xs: 0.625rem;
  /* Monospace label tracking — used in Loader and Footnote */
  --tracking-wider-mono: 0.2em;

  /* Shadow tokens */

  /* Default resting shadow — equivalent to Tailwind's shadow-sm. Used on
     buttons, sliders, popover triggers in non-floating state. */
  --shadow-rest: 0 1px 2px 0 rgb(0 0 0 / 0.05);

  /* Swiss "hard offset" stamp — rests at 2px/2px, lifts to 3px/3px on
     hover, presses back to 1px/1px on active. Primary button motif. */
  --shadow-stamp-rest: 0.125rem 0.125rem 0 0 rgb(0 0 0 / 0.1);
  --shadow-stamp-hover: 0.1875rem 0.1875rem 0 0 rgb(0 0 0 / 0.15);
  --shadow-stamp-pressed: 0.0625rem 0.0625rem 0 0 rgb(0 0 0 / 0.1);

  /* Card-tier hard-offset stamp — wider, brand-tinted. Used on
     interactive cards (FontSampler hover). */
  --shadow-stamp-card: 5px 5px 0 0 var(--color-brand);

  /* Floating popovers (typography menu, combo control list). */
  --shadow-popover: 0 20px 40px -10px rgb(0 0 0 / 0.15);

  /* Drop-shadow under semi-translucent floating panels like the
     comparison slider's character row. */
  --shadow-floating-panel: 0 25px 50px -12px rgb(0 0 0 / 0.05);
  --shadow-floating-panel-dark: 0 25px 50px -12px rgb(0 0 0 / 0.2);

  /* Drawer / overlay shadow — full-strength shadow-2xl. */
  --shadow-overlay: 0 25px 50px -12px rgb(0 0 0 / 0.25);

  /* Motion tokens */

  --duration-fast: 150ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  --duration-slower: 500ms;

  /* Tailwind's default ease-in-out — symmetric, good for layout shifts. */
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  /* Decelerating curve — matches Tailwind's ease-out. Dominant in this codebase. */
  --ease-out-soft: cubic-bezier(0, 0, 0.2, 1);
  /* Spring overshoot — used in character pop animation. */
  --ease-spring-overshoot: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

  body {
    @apply bg-background text-foreground;
    font-family: var(--font-secondary);
    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;
  }
}

/* Design-system utilities.
   Defined via `@utility` (Tailwind v4) so they integrate with the variant
   system (`hover:`, `dark:`, breakpoints) and don't rely on `@apply`
   chains. Colors reference the mode-switching semantic vars defined in
   `:root`/`.dark` above, so most utilities need no `dark:` variant in
   their definition or at call sites. */

@utility border-subtle {
  border-color: var(--color-border-subtle);
}

/* Same color as border-subtle, applied via background-color — for 1px
   dividers, inline separator strips, and other hairlines that aren't
   element borders. */
@utility bg-subtle {
  background-color: var(--color-border-subtle);
}

/* Muted text color — paired with `border-subtle` naming. The previous
   name `text-secondary` collided with Tailwind v4 auto-generating a
   utility from `--color-secondary` (the shadcn near-white surface token
   registered in `@theme`), which made every consumer effectively
   invisible (near-white text on light backgrounds). */
@utility text-subtle {
  color: var(--color-text-subtle);
}

@utility focus-ring {
  &:focus-visible {
    outline: 2px solid transparent;
    outline-offset: 2px;
    box-shadow: 0 0 0 2px var(--color-background, white), 0 0 0 4px var(--color-brand);
  }
}

/* Surface utilities */

@utility surface-canvas {
  background-color: var(--color-surface);
}

@utility surface-card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-border-subtle);
}

@utility surface-card-elevated {
  background-color: var(--color-paper);
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-rest);
}

@utility surface-popover {
  background-color: var(--color-paper);
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-popover);
}

@utility surface-floating {
  background-color: color-mix(in srgb, var(--color-surface) 80%, transparent);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border-subtle);
}

/* Shape / layout */

@utility flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

@utility skeleton-fill {
  background-color: color-mix(in srgb, var(--color-skeleton) 70%, transparent);
}

/* Subtle dotted-grid overlay used as a decorative background on the
   comparison paper surface. Color and intensity auto-switch via
   --color-grid-line. `bg-grid-sm` uses a tighter cell — typical mobile
   choice; `bg-grid` is the default desktop cell. Pair with absolute /
   pointer-events-none on the overlay element. */
@utility bg-grid {
  background-image:
    linear-gradient(var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
  background-size: 20px 20px;
}

@utility bg-grid-sm {
  background-image:
    linear-gradient(var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
  background-size: 10px 10px;
}

/* Typography */

@utility text-label-mono {
  font-family: var(--font-primary);
  font-weight: 700;
  letter-spacing: -0.025em;
  text-transform: uppercase;
}

/* Honor prefers-reduced-motion: collapse animation and transition timing. */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Hint the upcoming height animation on open collapsibles. */
[data-state="open"] {
    will-change: height;
}

/* Transition siblings of a focus-visible peer. */
.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 styling */

/* Standard API: color + width (Chrome 121+, Firefox 64+). */
@supports (scrollbar-width: auto) {
    * {
        scrollbar-width: thin;
        scrollbar-color: hsl(0 0% 70% / 0.4) var(--color-surface);
    }

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

/* WebKit fallback: applies on top of the standard API in Chrome, standalone in
   older Safari. Covers what scrollbar-width can't — hiding buttons, exact sizing. */
@supports selector(::-webkit-scrollbar) {
    ::-webkit-scrollbar {
        width: 6px;
        height: 6px;
    }

    ::-webkit-scrollbar-button {
        display: none; /* hide scrollbar buttons */
    }

    ::-webkit-scrollbar-track {
        background: var(--color-surface);
    }

    ::-webkit-scrollbar-thumb {
        background: hsl(0 0% 70% / 0.4);
        border-radius: 3px;
    }

    ::-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: var(--color-surface);
    }

    .dark ::-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); }
}

html {
    scroll-behavior: smooth;
}

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

body {
    overscroll-behavior-y: none;
}

.scroll-stable {
    scrollbar-gutter: stable;
}