/* Linear-Inspired Design System v2.0 */
/* Fonts: Space Grotesk for headlines, Inter for body */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

@tailwind base;
@tailwind components;
@tailwind utilities;

@layer base {

  /* ============================================
     CSS Custom Properties (Design Tokens)
     ============================================ */
  :root {
    /* Font families */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    /* Transition timing */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out-expo: cubic-bezier(0.87, 0, 0.13, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Duration */
    --duration-instant: 50ms;
    --duration-fast: 100ms;
    --duration-normal: 150ms;
    --duration-slow: 250ms;
    --duration-slower: 400ms;

    /* Light mode (Bone) */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #FAFAFA;
    --color-bg-tertiary: #F5F5F5;
    --color-bg-elevated: #FFFFFF;

    --color-text-primary: #171717;
    --color-text-secondary: #525252;
    --color-text-tertiary: #A3A3A3;
    --color-text-quaternary: #D4D4D4;

    --color-border-default: #E5E5E5;
    --color-border-subtle: #F5F5F5;
    --color-border-strong: #D4D4D4;

    --color-accent: #5E6AD2;
    --color-accent-hover: #6E7AE2;
    --color-accent-muted: rgba(94, 106, 210, 0.15);

    /* shadcn/ui compatibility */
    --background: 0 0% 100%;
    --foreground: 0 0% 9%;
    --card: 0 0% 100%;
    --card-foreground: 0 0% 9%;
    --popover: 0 0% 100%;
    --popover-foreground: 0 0% 9%;
    --primary: 235 58% 60%;
    --primary-foreground: 0 0% 100%;
    --secondary: 0 0% 96%;
    --secondary-foreground: 0 0% 9%;
    --muted: 0 0% 96%;
    --muted-foreground: 0 0% 45%;
    --accent: 235 58% 60%;
    --accent-foreground: 0 0% 100%;
    --destructive: 0 84% 60%;
    --destructive-foreground: 0 0% 100%;
    --border: 0 0% 90%;
    --input: 0 0% 90%;
    --ring: 235 58% 60%;
    --radius: 6px;
  }

  /* Dark mode (Charcoal) */
  .dark {
    --color-bg-primary: #0A0A0A;
    --color-bg-secondary: #111111;
    --color-bg-tertiary: #1A1A1A;
    --color-bg-elevated: #171717;

    --color-text-primary: #FAFAFA;
    --color-text-secondary: #A3A3A3;
    --color-text-tertiary: #737373;
    --color-text-quaternary: #525252;

    --color-border-default: #262626;
    --color-border-subtle: #1F1F1F;
    --color-border-strong: #404040;

    /* shadcn/ui compatibility */
    --background: 0 0% 4%;
    --foreground: 0 0% 98%;
    --card: 0 0% 9%;
    --card-foreground: 0 0% 98%;
    --popover: 0 0% 9%;
    --popover-foreground: 0 0% 98%;
    --primary: 235 58% 60%;
    --primary-foreground: 0 0% 100%;
    --secondary: 0 0% 15%;
    --secondary-foreground: 0 0% 98%;
    --muted: 0 0% 15%;
    --muted-foreground: 0 0% 64%;
    --accent: 235 58% 60%;
    --accent-foreground: 0 0% 100%;
    --destructive: 0 84% 60%;
    --destructive-foreground: 0 0% 100%;
    --border: 0 0% 15%;
    --input: 0 0% 15%;
    --ring: 235 58% 60%;
  }

  /* ============================================
     Base Styles
     ============================================ */
  html {
    font-size: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-x: hidden;
  }

  body {
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-feature-settings: 'ss01' 1, 'cv01' 1;
    letter-spacing: -0.011em;
    transition:
      background-color var(--duration-slow) var(--ease-out-expo),
      color var(--duration-slow) var(--ease-out-expo);
  }

  /* Code */
  code,
  pre,
  kbd,
  samp {
    font-family: var(--font-mono);
  }

  /* Headings - Space Grotesk */
  h1,
  h2,
  h3,
  h4,
  h5,
  h6,
  .font-display {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
  }

  h1 {
    font-size: 2rem;
    line-height: 1.2;
  }

  h2 {
    font-size: 1.5rem;
    line-height: 1.25;
  }

  h3 {
    font-size: 1.25rem;
    line-height: 1.3;
  }

  h4 {
    font-size: 1.125rem;
    line-height: 1.35;
  }

  h5 {
    font-size: 1rem;
    line-height: 1.4;
  }

  h6 {
    font-size: 0.875rem;
    line-height: 1.45;
  }

  /* ============================================
     Interactive Elements
     ============================================ */
  button,
  input,
  select,
  textarea,
  a {
    min-height: 44px;
    min-width: 44px;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  /* Global interactive transition */
  button,
  a,
  input,
  select,
  textarea,
  [role="button"],
  [tabindex="0"] {
    transition:
      background-color var(--duration-fast) var(--ease-out-expo),
      border-color var(--duration-fast) var(--ease-out-expo),
      color var(--duration-fast) var(--ease-out-expo),
      box-shadow var(--duration-normal) var(--ease-out-expo),
      transform var(--duration-fast) var(--ease-spring);
  }

  /* Focus ring (Linear-style) */
  *:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-bg-primary), 0 0 0 4px var(--color-accent);
    transition: box-shadow var(--duration-normal) var(--ease-out-expo);
  }

  /* Subtle press effect */
  button:active:not(:disabled),
  [role="button"]:active:not(:disabled) {
    transform: scale(0.98);
  }

  /* ============================================
     Typography
     ============================================ */
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
  }

  h1 {
    font-size: 30px;
    line-height: 1.2;
  }

  h2 {
    font-size: 24px;
    line-height: 1.3;
  }

  h3 {
    font-size: 18px;
    line-height: 1.4;
  }

  h4 {
    font-size: 16px;
    line-height: 1.5;
  }

  /* Links (subtle, no color, underline on hover) */
  a:not(.btn):not([class*="bg-"]) {
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out-expo);
  }

  a:not(.btn):not([class*="bg-"]):hover {
    color: var(--color-accent);
  }

  /* Selection */
  ::selection {
    background-color: var(--color-accent-muted);
    color: var(--color-text-primary);
  }

  /* ============================================
     Reduced Motion
     ============================================ */
  @media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }

  /* ============================================
     High Contrast Mode
     ============================================ */
  @media (prefers-contrast: high) {
    :root {
      --color-border-default: #171717;
      --color-border-subtle: #525252;
    }

    .dark {
      --color-border-default: #FAFAFA;
      --color-border-subtle: #A3A3A3;
    }
  }
}

@layer components {

  /* ============================================
     Custom Scrollbar (Linear-style)
     ============================================ */
  .custom-scrollbar::-webkit-scrollbar {
    width: 8px;
    height: 8px;
  }

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

  .custom-scrollbar::-webkit-scrollbar-thumb {
    background-color: var(--color-border-default);
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: content-box;
  }

  .custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-border-strong);
  }

  /* Hide scrollbar */
  .no-scrollbar::-webkit-scrollbar {
    display: none;
  }

  .no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

  /* ============================================
     Button Styles
     ============================================ */
  .btn {
    @apply inline-flex items-center justify-center gap-2;
    height: 36px;
    padding: 0 14px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
  }

  .btn-primary {
    background-color: var(--color-accent);
    color: white;
  }

  .btn-primary:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
  }

  .btn-secondary {
    background-color: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-default);
  }

  .btn-secondary:hover:not(:disabled) {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border-color: var(--color-border-strong);
  }

  .btn-ghost {
    background-color: transparent;
    color: var(--color-text-secondary);
  }

  .btn-ghost:hover:not(:disabled) {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
  }

  .btn-destructive {
    background-color: #EF4444;
    color: white;
  }

  .btn-destructive:hover:not(:disabled) {
    background-color: #DC2626;
  }

  .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }

  /* ============================================
     Card Styles
     ============================================ */
  .card {
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border-subtle);
    border-radius: 8px;
    transition:
      border-color var(--duration-fast) var(--ease-out-expo),
      box-shadow var(--duration-normal) var(--ease-out-expo);
  }

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

  .card-interactive:hover {
    border-color: var(--color-border-strong);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  }

  .dark .card-interactive:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }

  /* ============================================
     Input Styles
     ============================================ */
  .input {
    height: 36px;
    padding: 0 12px;
    font-size: 14px;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    color: var(--color-text-primary);
    transition:
      border-color var(--duration-fast) var(--ease-out-expo),
      box-shadow var(--duration-normal) var(--ease-out-expo);
  }

  .input::placeholder {
    color: var(--color-text-tertiary);
  }

  .input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-muted);
    outline: none;
  }

  /* ============================================
     Badge Styles
     ============================================ */
  .badge {
    @apply inline-flex items-center justify-center;
    height: 20px;
    padding: 0 6px;
    font-size: 11px;
    font-weight: 500;
    border-radius: 4px;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
  }

  .badge-accent {
    background-color: var(--color-accent-muted);
    color: var(--color-accent);
  }

  .badge-success {
    background-color: rgba(34, 197, 94, 0.15);
    color: #22C55E;
  }

  .badge-warning {
    background-color: rgba(234, 179, 8, 0.15);
    color: #CA8A04;
  }

  .badge-destructive {
    background-color: rgba(239, 68, 68, 0.15);
    color: #EF4444;
  }

  /* ============================================
     Skeleton Loading (Shimmer)
     ============================================ */
  .skeleton {
    background: linear-gradient(90deg,
        var(--color-bg-tertiary) 0%,
        var(--color-bg-secondary) 50%,
        var(--color-bg-tertiary) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: 4px;
  }

  @keyframes shimmer {
    0% {
      background-position: 200% 0;
    }

    100% {
      background-position: -200% 0;
    }
  }

  /* ============================================
     Tooltip
     ============================================ */
  .tooltip {
    position: absolute;
    z-index: 50;
    padding: 6px 10px;
    font-size: 12px;
    font-weight: 500;
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    border-radius: 6px;
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition:
      opacity var(--duration-fast) var(--ease-out-expo),
      transform var(--duration-normal) var(--ease-out-expo);
  }

  .tooltip.show {
    opacity: 1;
    transform: translateY(0);
  }

  /* ============================================
     Divider
     ============================================ */
  .divider {
    height: 1px;
    background-color: var(--color-border-subtle);
  }
}

@layer utilities {

  /* Screen reader only */
  .sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
  }

  /* Touch target */
  .touch-target {
    min-height: 44px;
    min-width: 44px;
    @apply flex items-center justify-center;
  }

  /* Text colors using CSS vars */
  .text-primary {
    color: var(--color-text-primary);
  }

  .text-secondary {
    color: var(--color-text-secondary);
  }

  .text-tertiary {
    color: var(--color-text-tertiary);
  }

  .text-quaternary {
    color: var(--color-text-quaternary);
  }

  .text-accent {
    color: var(--color-accent);
  }

  /* Background colors using CSS vars */
  .bg-primary {
    background-color: var(--color-bg-primary);
  }

  .bg-secondary {
    background-color: var(--color-bg-secondary);
  }

  .bg-tertiary {
    background-color: var(--color-bg-tertiary);
  }

  .bg-elevated {
    background-color: var(--color-bg-elevated);
  }

  /* Border colors using CSS vars */
  .border-default {
    border-color: var(--color-border-default);
  }

  .border-subtle {
    border-color: var(--color-border-subtle);
  }

  .border-strong {
    border-color: var(--color-border-strong);
  }

  /* Animation utilities */
  .animate-in {
    animation: fade-in var(--duration-normal) var(--ease-out-expo);
  }

  .animate-slide-up {
    animation: slide-up var(--duration-slow) var(--ease-out-expo);
  }

  .animate-scale-in {
    animation: scale-in var(--duration-normal) var(--ease-out-expo);
  }

  @keyframes fade-in {
    from {
      opacity: 0;
    }

    to {
      opacity: 1;
    }
  }

  @keyframes slide-up {
    from {
      opacity: 0;
      transform: translateY(8px);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes scale-in {
    from {
      opacity: 0;
      transform: scale(0.96);
    }

    to {
      opacity: 1;
      transform: scale(1);
    }
  }
}