/* style.css — Enhanced AuDHD Recipes State Styles with Accessibility Improvements (2025-07-C.03) */

/* ─── CSS Layers for Organization and Extensibility ────────────────────────── */
@layer base, theme, components, states, utilities;

/* ─── Base Layer: Resets, Typography, Accessibility ────────────────────────── */
@layer base {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    font-size: 16px;
    line-height: 1.6; /* Increased for readability */
    scroll-behavior: smooth;
  }

  body {
    font-family: var(--font-body);
    min-height: 100vh;
    transition: background-color var(--transition-slow), color var(--transition-slow);
    overflow-x: hidden;
  }

  :focus-visible {
    outline: var(--focus-outline);
    outline-offset: var(--focus-offset);
  }

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

/* ─── Theme Layer: Variables, Light/Dark Modes ─────────────────────────────── */
@layer theme {
  :root {
    --spacing-unit: 0.5rem;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition-fast: 0.2s ease;
    --transition-slow: 0.3s ease;
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --font-body: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: var(--font-body);
    --font-dyslexia: 'OpenDyslexic', sans-serif; /* Optional dyslexia-friendly font */
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-sm: 0.875rem;
    --font-size-xl: 1.5rem;
    --filter-max-visible: 8;
    --filter-button-width: 6rem;
    --touch-target-min: 48px; /* Increased for accessibility */
  }

  :root[data-theme="light"] {
    --bg: #ffffff;
    --fg: #1a1a1a; /* Darker for 4.5:1 contrast on #fff */
    --accent: #0d9488; /* Adjusted for 3:1 on --card-bg */
    --accent-hover: #087f7b;
    --card-bg: #f9f9f9;
    --hover-bg: #e6f0fa;
    --error-bg: #f8d7da; /* Adjusted for 4.5:1 with --error-fg */
    --error-fg: #721c24;
    --focus-outline: 3px solid #194563; /* Thicker for visibility */
    --focus-offset: 3px;
    --shimmer-gradient: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.5) 50%, rgba(255,255,255,0) 100%);
    --shadow-color: rgba(0, 0, 0, 0.1);
  }

  :root[data-theme="dark"] {
    --bg: #1e1e1e;
    --fg: #f5f5f5; /* Lighter for 4.5:1 contrast on #1e1e1e */
    --accent: #4dbfaf;
    --accent-hover: #3b9b8f;
    --card-bg: #2e2e2e;
    --hover-bg: #3a3a3a;
    --error-bg: #9b2c2c; /* Adjusted for 4.5:1 with --error-fg */
    --error-fg: #f8d7da;
    --focus-outline: 3px solid #7dd3fc;
    --focus-offset: 3px;
    --shimmer-gradient: linear-gradient(90deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.3) 50%, rgba(0,0,0,0) 100%);
    --shadow-color: rgba(0, 0, 0, 0.5);
  }

  :root[data-theme="high-contrast"] {
    --bg: #000000;
    --fg: #ffffff;
    --accent: #ffff00;
    --accent-hover: #e6e600;
    --card-bg: #1a1a1a;
    --hover-bg: #333333;
    --error-bg: #cc0000;
    --error-fg: #ffffff;
    --focus-outline: 4px solid #ffff00; /* Thicker for high contrast */
    --focus-offset: 4px;
    --shimmer-gradient: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.8) 50%, rgba(255,255,255,0) 100%);
    --shadow-color: rgba(255, 255, 255, 0.2);
  }

  :root[data-theme="sepia"] {
    --bg: #f4ecd8;
    --fg: #4a3728; /* Adjusted for 4.5:1 contrast */
    --accent: #a0522d;
    --accent-hover: #8b4513;
    --card-bg: #e4d5b7;
    --hover-bg: #d2b48c;
    --error-bg: #b91c1c; /* Adjusted for 4.5:1 with --error-fg */
    --error-fg: #f8d7da;
    --focus-outline: 3px solid #5b4636;
    --focus-offset: 3px;
    --shimmer-gradient: linear-gradient(90deg, rgba(91,70,54,0) 0%, rgba(91,70,54,0.3) 50%, rgba(91,70,54,0) 100%);
    --shadow-color: rgba(91, 70, 54, 0.1);
  }

  :root[data-font="dyslexia"] {
    --font-body: var(--font-dyslexia);
    --font-heading: var(--font-dyslexia);
    --line-height: 1.8; /* Increased for dyslexia readability */
  }

  body, .card, button, input, select, textarea {
    transition: background-color var(--transition-slow), color var(--transition-slow), border-color var(--transition-slow);
  }
}

/* ─── Components Layer: Reusable UI Elements ───────────────────────────────── */
@layer components {
  .btn {
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
    border: none;
    border-radius: var(--border-radius-md);
    background-color: var(--accent);
    color: var(--fg); /* Ensure contrast with --accent */
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: var(--touch-target-min);
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
  }

  .btn:active {
    transform: translateY(0);
  }

  .btn[aria-pressed="true"] {
    background-color: var(--accent-hover);
    box-shadow: inset 0 2px 4px var(--shadow-color);
  }

  #theme-toggle,
  #favorites-toggle {
    margin: calc(var(--spacing-unit) / 2);
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
    background: var(--card-bg);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-sm);
    min-height: var(--touch-target-min);
  }

  #filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: calc(var(--spacing-unit) / 2);
    max-width: 100%;
    padding: var(--spacing-unit);
    position: relative;
    z-index: 10; /* Prevent overlap with other content */
  }

  #filters button {
    padding: calc(var(--spacing-unit) / 2) var(--spacing-unit);
    background: var(--card-bg);
    border: 1px solid var(--hover-bg); /* Added for better visibility */
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
    flex: 0 0 auto;
    min-width: calc(var(--filter-button-width) * 0.8);
    max-width: calc(var(--filter-button-width) * 1.5);
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: var(--touch-target-min);
    color: var(--fg);
    font-size: var(--font-size-sm);
  }

  #filters button[aria-pressed="true"] {
    background-color: var(--accent);
    color: var(--fg);
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
  }

  .filters__more {
    padding: calc(var(--spacing-unit) / 2) var(--spacing-unit);
    background: var(--card-bg);
    border: 1px solid var(--hover-bg); /* Added for consistency */
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--fg);
    min-height: var(--touch-target-min);
  }

  #filters [data-hidden="true"] {
    display: none;
  }

  .filters__modal,
  .filters__dropdown {
    display: none;
    position: fixed;
    top: calc(var(--spacing-unit) * 10); /* Below header */
    left: var(--spacing-unit);
    right: var(--spacing-unit);
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--hover-bg); /* Added for visibility */
    box-shadow: var(--shadow-md);
    padding: var(--spacing-unit);
    max-height: 50vh;
    overflow-y: auto;
    z-index: 1000;
  }

  .filters__modal[aria-expanded="true"],
  .filters__dropdown[aria-expanded="true"] {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-unit);
  }

  .card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: calc(var(--spacing-unit) * 3);
    margin: calc(var(--spacing-unit) * 1.5);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1.5);
    overflow: hidden;
    max-width: 100%;
    word-break: break-word;
  }

  .card:hover {
    background-color: var(--hover-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 0 2px var(--accent); /* Enhanced hover */
  }

  .skeleton {
    background-color: var(--card-bg);
    height: 12rem; /* Increased for better card spacing */
    border-radius: var(--border-radius-md);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
  }

  @keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
  }

  .skeleton::before {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background-image: var(--shimmer-gradient);
    background-repeat: no-repeat;
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
  }

  #modal-root {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity var(--transition-slow);
    overflow-y: auto;
    padding: var(--spacing-unit);
  }

  #modal-root .modal {
    background: var(--card-bg);
    padding: calc(var(--spacing-unit) * 4);
    border-radius: var(--border-radius-lg);
    max-width: calc(100% - var(--spacing-unit) * 2);
    max-height: calc(100vh - var(--spacing-unit) * 4);
    overflow-y: auto;
    box-shadow: var(--shadow-md);
    position: relative;
    word-break: break-word;
    border: 1px solid var(--hover-bg); /* Added for consistency */
  }

  .modal-close {
    position: absolute;
    top: calc(var(--spacing-unit) * 2);
    right: calc(var(--spacing-unit) * 2);
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-lg);
    color: var(--fg);
    min-height: var(--touch-target-min);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  input[type="search"], select, textarea {
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    border: 1px solid var(--hover-bg);
    border-radius: var(--border-radius-md);
    background: var(--card-bg);
    width: 100%;
    transition: border-color var(--transition-fast), outline var(--transition-fast);
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: var(--touch-target-min);
    color: var(--fg);
    font-size: var(--font-size-base);
  }

  input[type="search"]:focus, select:focus, textarea:focus {
    border-color: var(--accent);
    outline: var(--focus-outline);
  }

  textarea {
    resize: vertical;
    min-height: 100px;
  }

  .error-message {
    background: var(--error-bg);
    color: var(--error-fg);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-unit) 0;
    text-align: center;
    word-break: break-word;
    max-width: 100%;
    font-size: var(--font-size-base);
    border: 1px solid var(--error-fg); /* Added for visibility */
  }

  .accent-picker {
    display: inline-flex;
    align-items: center;
    min-height: var(--touch-target-min);
  }

  .icon-theme, .icon-fav, .icon-details, .icon-close {
    width: calc(var(--font-size-lg) * 1.2);
    height: calc(var(--font-size-lg) * 1.2);
    fill: var(--fg);
    vertical-align: middle;
    margin-right: calc(var(--spacing-unit) / 2);
  }

  .btn--fav .icon-fav {
    fill: var(--accent);
  }

  .card-icon {
    width: calc(var(--font-size-lg) * 1.2);
    height: calc(var(--font-size-lg) * 1.2);
    fill: var(--accent);
    margin-bottom: var(--spacing-unit);
  }

  .steps-list {
    list-style: none;
    padding: 0;
    margin: calc(var(--spacing-unit) * 2) 0;
  }

  .steps-list li {
    display: flex;
    align-items: flex-start;
    gap: calc(var(--spacing-unit) / 2);
    margin-bottom: calc(var(--spacing-unit) * 1);
    font-size: var(--font-size-base);
  }

  .steps-list input[type="checkbox"] {
    margin-top: 0.25em;
    min-width: var(--font-size-lg);
    min-height: var(--font-size-lg);
  }

  .steps-list label {
    flex: 1;
  }

  .subs {
    font-size: var(--font-size-sm);
    color: var(--fg);
    opacity: 0.8;
  }
}

/* ─── States Layer: JS-Driven and Interactive States ───────────────────────── */
@layer states {
  .card.hidden {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
    pointer-events: none;
  }

  .loading {
    opacity: 0.7;
    pointer-events: none;
  }

  #modal-root[data-open="true"] {
    display: grid;
    opacity: 1;
  }

  #modal-root[data-open="false"] {
    opacity: 0;
  }

  .card[data-favorited="true"] {
    border: 2px solid var(--accent);
    position: relative;
  }

  #aria-live {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
  }
}

/* ─── Utilities Layer: Helpers, Media Queries ──────────────────────────────── */
@layer utilities {
  .flex {
    display: flex;
    gap: var(--spacing-unit);
    flex-wrap: wrap;
  }

  .flow > * + * {
    margin-top: var(--spacing-unit);
  }

  .grid {
    display: grid;
    gap: var(--spacing-unit);
  }

  @media (max-width: 320px) {
    html {
      font-size: 14px;
    }

    .card, #filters button, .btn {
      min-height: 52px;
      padding: calc(var(--spacing-unit) * 2);
    }

    #filters {
      grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
      gap: calc(var(--spacing-unit) / 4);
    }

    .modal {
      max-width: 100%;
      max-height: 100vh;
      border-radius: 0;
      padding: calc(var(--spacing-unit) * 2);
    }

    .filters__modal,
    .filters__dropdown {
      top: calc(var(--spacing-unit) * 8);
    }
  }

  @media (max-width: 480px) {
    html {
      font-size: 15px;
    }

    .card {
      margin: calc(var(--spacing-unit) / 2) 0;
      padding: calc(var(--spacing-unit) * 2.5);
    }

    #filters {
      grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
      gap: calc(var(--spacing-unit) / 2);
    }

    .btn {
      width: 100%;
      padding: calc(var(--spacing-unit) * 1.5) 0;
    }

    .filters__modal,
    .filters__dropdown {
      max-height: 60vh;
    }
  }

  @media (max-width: 768px) {
    .card {
      margin: calc(var(--spacing-unit) / 2) 0;
      padding: calc(var(--spacing-unit) * 3);
    }

    #filters button {
      min-width: calc(var(--filterវ0filter-button-width) * 0.9);
      padding: calc(var(--spacing-unit) * 1.5);
    }

    .recipe-grid {
      grid-template-columns: 1fr;
    }
  }

  @media (min-width: 769px) and (max-width: 1024px) {
    .recipe-grid {
      grid-template-columns: repeat(2, 1fr);
    }

    #filters {
      grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      gap: var(--spacing-unit);
    }

    .filters__dropdown {
      max-width: 60%;
      left: auto;
      right: var(--spacing-unit);
    }
  }

  @media (min-width: 1024px) {
    .recipe-grid {
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    #filters {
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: var(--spacing-unit);
    }
  }

  @media print {
    body {
      background: white;
      color: black;
      font-size: 12pt;
    }

    .card {
      box-shadow: none;
      border: 1px solid #000;
      page-break-inside: avoid;
      margin: 0.5in;
    }

    #modal-root, .skeleton, button, #filters, .filters__dropdown, .filters__modal {
      display: none;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    * {
      transition: none !important;
      animation: none !important;
    }
  }

  @media (prefers-contrast: more) {
    :focus-visible {
      outline: 4px solid var(--accent);
      outline-offset: 4px;
    }

    .btn, #filters button {
      border: 2px solid var(--fg); /* Thicker for visibility */
    }

    .card {
      box-shadow: 0 0 0 2px var(--fg);
    }
  }
}