/* UI Design System - Global Styles */

/* CSS Variables (Neutral + Blue Accent Palette) */
:root {
  --color-bg: #FFFFFF;
  --color-surface: #F8FAFC;
  --color-border: #E2E8F0;
  --color-text: #0F172A;
  --color-text-muted: #64748B;
  --color-primary: #3B82F6;      /* blue-500 */
  --color-primary-hover: #2563EB; /* blue-600 */
  --color-success: #10B981;      /* green-500 */
  --color-danger: #EF4444;       /* red-500 */
}

/* Reset */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

/* Base Typography */
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
}
h1 { font-size: 28px; margin: 0 0 16px; color: var(--color-text); }
h2 { font-size: 22px; margin: 0 0 12px; color: var(--color-text); }
h3 { font-size: 18px; margin: 0 0 8px; color: var(--color-text); }
p { margin: 8px 0; }
.subtitle {
  font-size: 16px;
  color: var(--color-text-muted);
  margin-top: -8px;
  margin-bottom: 24px;
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.top-nav {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}
.top-nav .nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.top-nav .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--color-text);
}
.top-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
}
.top-nav .nav-links a {
  color: var(--color-text);
  padding: 6px 10px;
  border-radius: 8px;
}
.top-nav .nav-links a:hover {
  background: var(--color-surface);
}

.page-container {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px 32px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
  padding: 16px;
}

/* Forms */
label { font-weight: 600; color: var(--color-text); }
input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
textarea,
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
}
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { background: #eef2f7; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-sm {
  padding: 6px 10px;
  font-size: 14px;
}

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }

.btn-secondary { background: var(--color-surface); color: var(--color-text); }
.btn-danger {
  background: var(--color-danger);
  border-color: var(--color-danger);
  color: #fff;
}
.btn-danger:hover { filter: brightness(0.95); }

/* Tables */
table { width: 100%; border-collapse: collapse; }
thead th {
  background: var(--color-surface);
  color: var(--color-text);
}
th, td { padding: 12px; border-bottom: 1px solid var(--color-border); text-align: left; }
tbody tr:nth-child(odd) { background: #fbfdff; }
tbody tr:hover { background: #f1f5fb; }

/* Responsive table container utility */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Banners */
.error-banner,
.success-banner {
  display: none;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  margin-bottom: 16px;
}
.error-banner { background: #fff1f2; color: var(--color-danger); border-color: #fecaca; }
.success-banner { background: #ecfdf5; color: var(--color-success); border-color: #a7f3d0; }
.error-banner .close-btn,
.success-banner .close-btn { float: right; background: none; border: none; font-weight: 700; cursor: pointer; }
.error-banner .close-btn { color: var(--color-danger); }
.success-banner .close-btn { color: var(--color-success); }

/* Loading indicators */
.loading { color: var(--color-text-muted); font-style: italic; }
.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: text-bottom;
}
.spinner,
.spinner-border {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: text-bottom;
}
.spinner-border-sm { width: 14px; height: 14px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Avatars & thumbnails */
.thumb-img { width: 40px; height: 40px; object-fit: cover; border-radius: 8px; background: #e5e7eb; }
.loading-thumb {
  animation: pulse 1.5s infinite ease-in-out;
}
@keyframes pulse {
  0% { background-color: #e5e7eb; }
  50% { background-color: #d1d5db; }
  100% { background-color: #e5e7eb; }
}

/* Badges */
.badges { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.badge { font-size: 12px; padding: 3px 8px; border-radius: 999px; background: #eef2f7; color: var(--color-text); border: 1px solid var(--color-border); }
.badge.new { background: #ecfdf5; color: var(--color-success); border-color: #a7f3d0; }
.badge.none { background: #f1f5f9; color: var(--color-text-muted); border-color: var(--color-border); }
.badge.error { background: #fff1f2; color: var(--color-danger); border-color: #fecaca; }
.badge.warning { background: #fffbeb; color: #b45309; border-color: #fcd34d; }
.badge.last { background: #eff6ff; color: var(--color-primary); border-color: #bfdbfe; }

/* Kebab menu (channels page) */
.actions-cell { position: relative; }
.kebab { display: inline-block; position: relative; }
.kebab-btn {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  padding: 6px 10px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
.kebab-btn:hover { background: var(--color-surface); }
.kebab-menu {
  position: absolute;
  right: 0;
  top: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
  min-width: 180px;
  z-index: 100;
}
.kebab-menu .menu-item {
  display: block;
  width: 100%;
  background: transparent;
  color: var(--color-text);
  border: none;
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
}
.kebab-menu .menu-item:hover { background: var(--color-surface); }
.kebab-menu .menu-item.pending { color: var(--color-danger); }

::placeholder { color: var(--color-text-muted); opacity: 1; }

/* Videos page components */
.list { display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }
.row { display: grid; grid-template-columns: 160px 1fr; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--color-border); }
.thumb-row { width: 160px; height: 90px; object-fit: cover; background: #e5e7eb; border-radius: 8px; }
.row-content { display: flex; flex-direction: column; gap: 6px; }
.channel-title { font-size: 15px; font-weight: 700; color: var(--color-text); }
.title-row { font-size: 14px; font-weight: 600; color: var(--color-primary); }
.title-row:hover { text-decoration: underline; }
.meta-row { font-size: 12px; color: var(--color-text-muted); }
.row.seen { opacity: 0.6; }
.status-row { display: flex; align-items: center; gap: 8px; }
.status-badge { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: #eef2f7; color: var(--color-text-muted); }
.status-badge.seen { background: #ecfdf5; color: var(--color-success); }
.status-badge.unseen { background: #eff6ff; color: var(--color-primary); }
.action-btn { border: 1px solid var(--color-border); background: var(--color-bg); color: var(--color-text); padding: 6px 10px; border-radius: 10px; cursor: pointer; font-size: 12px; }
.action-btn:hover { background: var(--color-surface); }
.ai-summary { margin: 8px 0; font-size: 12px; line-height: 1.4; color: var(--color-text-muted); }
.ai-summary-title { font-size: 12px; font-weight: 600; color: var(--color-text); margin-bottom: 4px; }
.ai-summary-list { margin: 0; padding-left: 16px; }
.ai-summary-list li { color: var(--color-text-muted); margin-bottom: 2px; }
.ai-summary.unavailable { font-style: italic; }
.ai-summary.limit-reached { font-style: italic; }
.filter-controls { display: flex; align-items: center; gap: 8px; }

/* Unified filter bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
}
.filter-item { display: inline-flex; align-items: center; gap: 8px; }
.filter-item label, .filter-label { font-weight: 600; font-size: 14px; color: var(--color-text); }
.filter-bar .filter-select { font-size: 14px; padding: 6px 10px; border-radius: 10px; }

@media (max-width: 768px) {
  .filter-bar { flex-wrap: wrap; }
}
@media (max-width: 480px) {
  .filter-bar { flex-direction: column; align-items: flex-start; gap: 10px; }
  .filter-item { width: 100%; }
}

/* Toggle (switch) control */
.toggle { display: inline-flex; align-items: center; cursor: pointer; }
.toggle input { position: absolute; opacity: 0; pointer-events: none; }
.toggle-track {
  width: 40px;
  height: 22px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  position: relative;
  transition: background 0.2s ease, border-color 0.2s ease;
  display: inline-block;
}
.toggle-thumb {
  position: absolute;
  /* Center the thumb vertically within the track (accounts for 1px borders) */
  top: 1px;
  left: 1px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.15);
  transition: transform 0.2s ease;
}
.toggle input:checked + .toggle-track {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(18px);
}
.toggle input:focus + .toggle-track {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.20);
}

/* Form group alignment (per UI guidelines) */
.form-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* Email display row for horizontal alignment */
.email-display-row {
  display: flex;
  align-items: flex-end;
  gap: 16px;
}

.email-display-row .form-group {
  flex: 1;
  margin-bottom: 0;
}

.email-display-row .btn {
  margin-bottom: 0;
}

/* Channels page: stack labels above inputs for add-channel form */
#addChannelForm .form-group {
  display: block;
}
#addChannelForm .form-group label {
  display: block;
  margin-bottom: 6px;
}
#addChannelForm .form-group input,
#addChannelForm .form-group textarea {
  width: 100%;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
.modal {
  background: var(--color-bg);
  border-radius: 12px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transform: translateY(20px);
  transition: transform 0.2s ease;
}
.modal-overlay.open .modal {
  transform: translateY(0);
}
.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}
.modal-header h3 {
  margin: 0;
  font-size: 18px;
  color: var(--color-text);
}
.modal-body {
  padding: 20px;
  color: var(--color-text);
}
.modal-actions {
  padding: 16px 20px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Base styles for nav toggle (hidden on desktop) */
.nav-toggle { display: none; }
.nav-toggle-label { display: none; }

/* Responsive Media Queries */
@media (max-width: 768px) {
  /* Navbar compact spacing and wrapping on tablet */
  .top-nav .nav-inner { padding: 10px 12px; }
  .top-nav .nav-links { gap: 10px; flex-wrap: wrap; }

  /* Page container slight compacting */
  .page-container { margin: 16px auto; padding: 0 16px 24px; }

  /* Cards: slightly reduced padding */
  .card { padding: 14px; }

  /* Headings: reduce margins for tighter rhythm */
  h1 { margin: 0 0 12px; }
  h2 { margin: 0 0 10px; }
  h3 { margin: 0 0 6px; }

  /* Banners: ensure full width and compact padding */
  .error-banner,
  .success-banner { width: 100%; padding: 10px 12px; }
}

@media (max-width: 480px) {
  /* Page container becomes full-width; increase side padding for comfort */
  .page-container {
    max-width: none;
    width: 100%;
    margin: 16px auto;
    padding: 0 20px 24px; /* increased side padding; reduced vertical */
  }

  /* Navbar: Hamburger Menu */
  .top-nav .nav-inner {
    flex-wrap: wrap;
    padding: 8px 12px;
  }
  
  .nav-toggle-label {
    display: block;
    cursor: pointer;
    width: 24px;
    height: 24px;
    position: relative;
    margin-left: auto; /* Push to right if brand is left */
  }
  
  .nav-toggle-label span,
  .nav-toggle-label span::before,
  .nav-toggle-label span::after {
    display: block;
    background: var(--color-text);
    height: 2px;
    width: 100%;
    position: absolute;
    border-radius: 2px;
    transition: all 0.3s ease;
  }
  
  .nav-toggle-label span { top: 11px; }
  .nav-toggle-label span::before { content: ''; top: -7px; }
  .nav-toggle-label span::after { content: ''; top: 7px; }

  /* Animate hamburger to X when checked */
  #nav-toggle:checked + .nav-toggle-label span { background: transparent; }
  #nav-toggle:checked + .nav-toggle-label span::before { top: 0; transform: rotate(45deg); }
  #nav-toggle:checked + .nav-toggle-label span::after { top: 0; transform: rotate(-45deg); }

  /* Hide links by default, show when checked */
  .top-nav .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    margin-top: 12px;
    border-top: 1px solid var(--color-border);
  }
  
  .top-nav .nav-links a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-surface);
    width: 100%;
    text-align: center;
  }
  
  #nav-toggle:checked ~ .nav-links {
    display: flex;
  }

  /* Forms: labels above inputs on small screens */
  label { display: block; margin-bottom: 6px; }

  /* Email display row: stack vertically on mobile */
  .email-display-row {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .email-display-row .form-group {
    width: 100%;
  }

  .email-display-row .btn {
    width: 100%;
  }

  /* Buttons: full-width on mobile */
  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-danger { width: 100%; }

  /* Cards: reduced internal padding on mobile */
  .card { padding: 12px; }

  /* Headings: compact margins on mobile */
  h1 { margin: 0 0 10px; }
  h2 { margin: 0 0 8px; }
  h3 { margin: 0 0 6px; }

  /* Banners: full width and compact padding on mobile */
  .error-banner,
  .success-banner { width: 100%; padding: 10px 12px; }

  /* Ensure table container scroll is smooth on mobile */
  .table-responsive { -webkit-overflow-scrolling: touch; }
  
  /* Home Page: Card-like list items */
  .video-list li {
    display: block;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-surface);
    margin-bottom: 8px;
  }
  .video-list li a {
    display: block;
    font-weight: 600;
    margin-bottom: 4px;
    font-size: 16px;
  }
  
  /* Home Page Actions: Stack vertically */
  #home-actions {
    flex-direction: column;
    align-items: stretch !important; /* override inline style */
    gap: 8px !important;
  }
  #home-note {
    font-size: 12px;
    text-align: center;
  }
  
  /* Videos Page: Stack content */
  .row {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .thumb-row {
    width: 100%;
    height: auto;
    aspect-ratio: 16/9;
  }
  .row-content {
    width: 100%;
  }
  .row-content .ai-summary,
  .ai-summary {
    width: 100%;
    display: block;
  }
  
  /* Channels Page: Card view for table */
  #channelsTable, #channelsTable thead, #channelsTable tbody, #channelsTable th, #channelsTable td, #channelsTable tr {
    display: block;
  }
  #channelsTable thead { display: none; }
  
  /* Grid Layout for Channel Card */
  #channelsTable tr {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 0 12px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    margin-bottom: 16px;
    padding: 12px;
    background: var(--color-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  }
  
  /* Reset default cell styles for grid items */
  #channelsTable td {
    border: none;
    padding: 4px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: right;
  }
  
  /* Thumbnail: Top Left */
  #channelsTable td.thumb-cell {
    grid-column: 1;
    grid-row: 1;
    justify-content: center;
    margin-bottom: 0;
    padding: 0;
  }
  #channelsTable td.thumb-cell::before { display: none; }
  
  /* Title: Top Right (beside thumb) */
  #channelsTable td.channel-title-cell {
    grid-column: 2;
    grid-row: 1;
    justify-content: flex-start;
    text-align: left;
    font-weight: 700;
    font-size: 16px;
    padding: 0;
    align-items: center; /* Center vertically with thumb */
  }
  #channelsTable td.channel-title-cell::before { display: none; } /* Hide "Title" label */
  
  /* Other cells: Full width below */
  #channelsTable td {
    grid-column: 1 / -1;
  }
  
  /* Specific overrides for remaining cells to look good */
  #channelsTable td[data-label="Added On"],
  #channelsTable td[data-label="Notes"],
  #channelsTable td[data-label="Channel URL"] {
    border-top: 1px solid var(--color-surface);
    padding: 8px 0;
    margin-top: 4px;
  }

  /* Make labels smaller/lighter */
  #channelsTable td::before {
    content: attr(data-label);
    font-weight: 600;
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: left;
    margin-right: auto; /* Push value to right */
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  
  /* URL Cell: Hide label to save space? Or keep it? 
     User said "too big". Let's keep label small. 
  */
  
  /* Actions Cell */
  #channelsTable td.actions-cell {
    justify-content: flex-end;
    margin-top: 0;
    padding-top: 8px;
    border-top: 1px solid var(--color-border);
  }
  #channelsTable td.actions-cell::before { display: none; }
  
  .kebab-menu {
    right: 0;
    width: 200px;
  }
}

.filter-select { padding: 6px 10px; border-radius: 10px; border: 1px solid var(--color-border); background: var(--color-bg); font-size: 14px; }

/* Form validation helpers */
.invalid-feedback { display: none; color: var(--color-danger); font-size: 12px; margin-top: 4px; }
.form-text { font-size: 12px; color: var(--color-text-muted); }
.is-invalid { border-color: var(--color-danger); box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15); }
.is-invalid + .invalid-feedback { display: block; }

/* Index page: channel check blocks */
.channel-check { border: 1px solid var(--color-border); border-radius: 12px; padding: 12px; margin-top: 12px; background: var(--color-bg); }
.channel-check-header { display: flex; justify-content: space-between; align-items: baseline; }
.channel-check-title { font-weight: 700; color: var(--color-text); }
.channel-check-meta { font-size: 12px; color: var(--color-text-muted); }
.message-stack { margin-top: 8px; }
.message-stack p { margin: 4px 0; }
.video-list { margin-top: 8px; }
.video-list li { margin: 4px 0; }

/* Utility spacing */
.stack-16 { display: flex; flex-direction: column; gap: 16px; }
.stack-24 { display: flex; flex-direction: column; gap: 24px; }

/* Utility helpers */
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.ml-8 { margin-left: 8px; }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.w-100 { width: 100%; }
.page-container.narrow { max-width: 520px; }

/* Subscription Plans */
.subscription-plans {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 16px;
}

.plan-card {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  background: var(--color-surface);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.plan-card.current-plan {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}

.plan-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.plan-header h3 {
  margin: 0;
  color: var(--color-text);
  font-size: 18px;
  font-weight: 700;
}

.plan-badge {
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
}

.plan-badge.coming-soon {
  background: var(--color-text-muted);
  color: white;
}

.plan-details {
  margin-top: 8px;
}

.plan-description {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.5;
}

.plan-features-list {
  margin: 0;
  padding: 0;
  list-style-type: disc;
}

.plan-features-list li {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 4px;
}

@media (max-width: 768px) {
  .subscription-plans {
    gap: 12px;
  }
  
  .plan-card {
    padding: 16px;
  }
  
  .plan-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}