/* =============================================================
   Audio to Video — Unified Design System
   Matches frankfarukceviz.uk (D-Summary)
   ============================================================= */

   :root {
    --bg-color: #fcfcfc;
    --text-primary: #111111;
    --text-secondary: #555555;
    --text-tertiary: #888888;
    --accent-color: #000000;
    --border-color: #e2e2e2;
    --font-family: 'Inter', sans-serif;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;
  
    --nav-height: 80px;
    --max-w: 800px;
    --ease: 0.2s ease;
    
    /* App Specific */
    --card-bg: #ffffff;
    --dropzone-bg: #f9f9f9;
    --success-color: #27ae60;
    --error-color: #e74c3c;
  }
  
  /* ----- Reset & Base ----- */
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }
  
  /* ----- Layout ----- */
  .page-container {
    flex: 1;
    width: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: calc(var(--nav-height) + var(--spacing-xl)) 24px var(--spacing-xl);
  }
  
  /* ----- Navbar ----- */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--ease);
  }
  
  .navbar__logo-img {
    height: 36px;
    width: auto;
    display: block;
    filter: invert(1);
  }
  
  .navbar__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
  }
  
  .navbar__link {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-decoration: none;
    transition: color var(--ease);
    position: relative;
    padding-bottom: 4px;
  }
  
  .navbar__link:hover, .navbar__link.active {
    color: var(--text-primary);
  }
  
  .navbar__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--text-primary);
    transition: width var(--ease);
  }
  
  .navbar__link:hover::after, .navbar__link.active::after {
    width: 100%;
  }
  
  .navbar__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
  }
  
  .navbar__hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  
  @media (max-width: 768px) {
    .navbar { padding: 0 20px; }
    .navbar__hamburger { display: flex; }
    .navbar__menu {
      position: absolute;
      top: var(--nav-height);
      left: 0;
      right: 0;
      flex-direction: column;
      background: var(--bg-color);
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      border-bottom: 1px solid var(--border-color);
    }
    .navbar__menu.is-open { max-height: 300px; padding: 16px 0; }
    .navbar__link { display: block; padding: 12px 24px; text-align: center; }
    .navbar__link::after { display: none; }
  }
  
  /* ----- App Header ----- */
  .app-header {
    margin-bottom: var(--spacing-xl);
    text-align: left;
    border-bottom: 1px solid var(--text-primary);
    padding-bottom: var(--spacing-md);
  }
  
  .app-header__title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-sm);
  }
  
  .app-header__sub {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }
  
  /* ----- Main Card ----- */
  .main-card {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
  }
  
  /* ----- Dropzone ----- */
  .drop-zone {
    border: 2px dashed var(--border-color);
    padding: 80px var(--spacing-md);
    text-align: center;
    color: var(--text-secondary);
    background: var(--dropzone-bg);
    transition: all var(--ease);
    cursor: pointer;
    border-radius: 4px;
    margin-bottom: var(--spacing-lg);
  }
  
  .drop-zone.drag-over {
    border-color: var(--text-primary);
    background: #fff;
    transform: scale(1.01);
  }
  
  .drop-zone span {
    font-size: 1.1rem;
    display: block;
    margin-top: 16px;
  }
  
  .upload-icon {
    width: 48px;
    height: 48px;
    opacity: 0.4;
    transition: opacity var(--ease);
  }
  
  .drop-zone:hover .upload-icon {
    opacity: 1;
  }
  
  /* ----- Cover Upload ----- */
  .cover-upload {
    border: 1px dashed var(--border-color);
    background: var(--dropzone-bg);
    border-radius: 4px;
    margin-bottom: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--ease);
    overflow: hidden;
  }

  .cover-upload.drag-over {
    border-color: var(--text-primary);
    background: #fff;
  }

  .cover-placeholder {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    color: var(--text-secondary);
  }

  .cover-placeholder svg {
    flex-shrink: 0;
    opacity: 0.4;
  }

  .cover-placeholder span {
    font-size: 0.85rem;
    line-height: 1.5;
  }

  .cover-placeholder small {
    font-size: 0.75rem;
    color: var(--text-tertiary);
  }

  .cover-preview-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
  }

  .cover-preview {
    width: 64px;
    height: 64px;
    object-fit: cover;
    border-radius: 2px;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
  }

  .cover-preview-info {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    min-width: 0;
  }

  .cover-filename {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .cover-remove {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    width: 28px;
    height: 28px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.8rem;
    flex-shrink: 0;
    transition: all var(--ease);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .cover-remove:hover {
    border-color: var(--error-color);
    color: var(--error-color);
  }

  /* ----- File List ----- */
  .file-list {
    margin-top: var(--spacing-lg);
  }
  
  .file-list h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
  }
  
  #files-container {
    list-style: none;
    margin-bottom: var(--spacing-lg);
  }
  
  .file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #fdfdfd;
    border: 1px solid var(--border-color);
    margin-bottom: 8px;
    font-size: 0.9rem;
  }
  
  .file-name {
    font-weight: 500;
    color: var(--text-primary);
    word-break: break-all;
  }
  
  /* ----- Buttons ----- */
  .actions {
    display: flex;
    gap: 12px;
    margin-top: var(--spacing-lg);
  }
  
  .primary-btn {
    flex: 1;
    background: var(--accent-color);
    color: #fff;
    border: 1px solid var(--accent-color);
    padding: 14px 24px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--ease);
  }
  
  .primary-btn:hover {
    background: transparent;
    color: var(--accent-color);
  }
  
  .secondary-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 14px 24px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--ease);
  }
  
  .secondary-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
  }
  
  /* ----- Status & Progress ----- */
  .status-container {
    margin-top: var(--spacing-lg);
    text-align: center;
  }
  
  .loader {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--accent-color);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 1s linear infinite;
  }
  
  .progress-bar-container {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 12px;
  }
  
  .progress-bar {
    height: 100%;
    background: var(--accent-color);
    width: 0%;
    transition: width 0.3s ease;
  }
  
  #status-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
  }
  
  .success-msg {
    color: var(--success-color);
    font-weight: 600;
  }
  
  /* ----- Footer Match ----- */
  .footer {
    padding: var(--spacing-xl) 24px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
  }
  
  .footer__inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  @media (min-width: 768px) {
    .footer__inner { grid-template-columns: 1fr 1fr; }
  }
  
  .footer__logo { height: 44px; filter: invert(1); margin-bottom: var(--spacing-sm); }
  .footer__name { display: block; font-size: 1rem; font-weight: 700; margin-bottom: var(--spacing-md); color: var(--text-primary); }
  .footer__nav { display: flex; flex-direction: column; gap: 12px; margin-bottom: var(--spacing-lg); }
  .footer__navlink { color: var(--text-secondary); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; text-decoration: none; transition: color var(--ease); }
  .footer__navlink:hover { color: var(--text-primary); }
  .footer__copy { font-size: 0.8rem; color: var(--text-tertiary); }
  
  .footer__newsletter p { font-size: 0.9rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--spacing-md); }
  .footer__form { display: flex; gap: 8px; border-bottom: 1px solid var(--border-color); padding-bottom: 8px; }
  .footer__input { background: transparent; border: none; color: var(--text-primary); font-family: inherit; font-size: 1rem; outline: none; flex: 1; }
  .btn-white { border-color: var(--text-primary); background: transparent; padding: 10px 20px; text-transform: uppercase; font-weight: 600; cursor: pointer; }
  .btn-white:hover { background: var(--text-primary); color: #fff; }
  
  .footer__msg { font-size: 0.8rem; margin-top: 10px; color: var(--text-secondary); opacity: 0; transition: opacity 0.3s ease; }
  
  /* ----- Utilities ----- */
  .hidden { display: none !important; }
  .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
  
  @keyframes spin { to { transform: rotate(360deg); } }