:root {
  --primary-color: #db421f;
  --accent-color: #1f5bdb;
  --background-color: #f0f2f5;
  --card-background-color: #ffffff;
  --text-color: #333333;
  --muted-text-color: #6c757d;
  --border-color: #dee2e6;
  --hover-background-color: #e9ecef;
  --hover-card-background: #f8f9fa;
  --hover-text-color: #db421f;
  --button-hover-color: #ff7043;
  --hover-shadow-color: rgba(0, 0, 0, 0.15);
  --hover-border-color: #db421f;
  --active-button-color: #c62828;
  --highlight-border-color: #1f5bdb;
  --search-bar-background: #ffffff;
  --search-bar-border: #ced4da;
  --search-bar-focus-border: #80bdff;
  --search-bar-placeholder: #adb5bd;
  --search-icon-color: #6c757d;
  --toggle-background: #ffffff;
  --toggle-border: #ced4da;
  --toggle-active-background: var(--accent-color);
  --toggle-active-color: #ffffff;

  --font-family: 'Inter', 'Poppins', sans-serif;
  --font-size-base: 18px;
  --font-size-lg: 1.4rem;
  --font-size-sm: 0.95rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  --container-padding: 1.5rem;
  --header-padding: 1.5rem 2rem;
  --card-padding: 1.5rem;
  --gap-size: 1.5rem;
  --border-radius: 12px;
  --button-size: 48px;
}

[data-theme='dark'] {
  --background-color: #121212;
  --card-background-color: #1e1e1e;
  --text-color: #e0e0e0;
  --muted-text-color: #bdbdbd;
  --border-color: #333333;
  --hover-background-color: #333366;
  --hover-card-background: #2c2c2c;
  --hover-text-color: #ffab91;
  --button-hover-color: #ffab91;
  --hover-shadow-color: rgba(255, 255, 255, 0.1);
  --hover-border-color: #ffab91;
  --active-button-color: #ff6f00;
  --highlight-border-color: #ffab91;
  --search-bar-background: #2c2c2c;
  --search-bar-border: #444;
  --search-bar-focus-border: #1f5bdb;
  --search-bar-placeholder: #6c757d;
  --search-icon-color: #adb5bd;
  --toggle-background: #2c2c2c;
  --toggle-border: #444;
  --toggle-active-background: var(--accent-color);
  --toggle-active-color: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: var(--container-padding);
  transition: background-color 0.3s, color 0.3s;
  font-size: var(--font-size-base);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s;
}

a:hover {
  color: var(--hover-text-color);
}

header {
  width: 100%;
  max-width: 1280px;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.5rem;
  padding: var(--header-padding);
  background-color: var(--card-background-color);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px var(--hover-shadow-color);
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

header h1 {
  font-size: 1.8rem;
  color: var(--primary-color);
  font-weight: var(--font-weight-bold);
  transition: color 0.3s;
  margin: 0;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
  max-width: 600px;
  margin-left: 2rem;
}

.search-bar {
  position: relative;
  flex: 1;
  min-width: 200px;
}

.search-bar input {
  width: 100%;
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  border: 1.5px solid var(--search-bar-border);
  border-radius: 8px;
  background-color: var(--search-bar-background);
  color: var(--text-color);
  font-size: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s, background-color 0.3s;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.search-bar input:focus {
  outline: none;
  border-color: var(--search-bar-focus-border);
  box-shadow: 0 0 0 4px rgba(25, 118, 210, 0.2);
}

.search-bar input::placeholder {
  color: var(--search-bar-placeholder);
}

.search-bar .search-icon {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--search-icon-color);
  pointer-events: none;
  font-size: 1.3rem;
  transition: color 0.3s;
}

.dropdown-list {
  width: 100%;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--card-background-color);
  border-radius: 8px;
  box-shadow: 0 8px 20px var(--hover-shadow-color);
  max-height: 300px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
  flex-direction: column;
  transition: opacity 0.3s, transform 0.3s;
  border: 1px solid var(--border-color);
}

.dropdown-list.show {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.dropdown-list-item {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.dropdown-list-item:last-child {
  border-bottom: none;
}

.dropdown-list-item.bold {
  font-weight: var(--font-weight-bold);
}

.dropdown-list-item:hover {
  background-color: var(--hover-background-color);
  color: var(--hover-text-color);
}

.theme-toggle,
.export-button {
  background-color: var(--toggle-background);
  border: 1px solid var(--toggle-border);
  padding: 0.6rem;
  border-radius: 50%;
  cursor: pointer;
  transition: background-color 0.3s, border-color 0.3s, transform 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--button-size);
  height: var(--button-size);
  box-shadow: 0 4px 12px var(--hover-shadow-color);
  flex-shrink: 0;
}

.theme-toggle:hover,
.export-button:hover {
  background-color: var(--button-hover-color);
  box-shadow: 0 6px 18px var(--hover-shadow-color);
}

.theme-toggle:active,
.export-button:active {
  background-color: var(--active-button-color);
  transform: scale(0.95);
}

.theme-toggle img,
.export-button img {
  width: 26px;
  height: 26px;
  transition: filter 0.3s;
}

.video-info-card {
  display: flex;
  align-items: center;
  background-color: var(--card-background-color);
  border-radius: var(--border-radius);
  padding: var(--card-padding);
  margin: -1.5rem auto 2rem auto;
  border: 2px solid var(--highlight-border-color);
  box-shadow: 0 4px 20px var(--hover-shadow-color);
  width: 100%;
  max-width: 1280px;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

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

.video-thumbnail {
  width: 140px;
  height: auto;
  border-radius: 10px;
  margin-right: 1.5rem;
  box-shadow: 0 4px 8px var(--hover-shadow-color);
  transition: transform 0.3s, box-shadow 0.3s;
  flex-shrink: 0;
}

.video-details {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 0.75rem;
  min-width: 0;
}

.video-title {
  font-size: 1.3rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-color);
  line-height: 1.3;
  transition: color 0.3s;
}

.video-title a {
  color: var(--text-color);
  transition: color 0.3s;
}

.video-title a:hover {
  color: var(--hover-text-color);
}

.video-duration,
.video-upload-date {
  font-size: 0.95rem;
  color: var(--muted-text-color);
}

.video-id,
.last-updated {
  font-size: 0.85rem;
  color: var(--muted-text-color);
}

.stats-grid {
  width: 100%;
  max-width: 1280px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-size);
  margin-bottom: 3rem;
}

.stats-grid.three-columns {
  grid-template-columns: repeat(3, 1fr);
}

.stat-card {
  background-color: var(--card-background-color);
  border-radius: var(--border-radius);
  padding: var(--card-padding);
  border: 1px solid var(--highlight-border-color);
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s,
    background-color 0.3s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 4px 20px var(--hover-shadow-color);
  min-height: 130px;
}

.stat-card:hover {
  box-shadow: 0 12px 30px var(--hover-shadow-color);
  border-color: var(--hover-border-color);
  background-color: var(--hover-card-background);
}

.stat-card h3 {
  font-size: 1.15rem;
  color: var(--primary-color);
  font-weight: var(--font-weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.stat-card h3 i {
  color: var(--primary-color);
  font-size: 1.35rem;
}

.stat-card .odometer {
  font-size: 1.6rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-color);
  line-height: 1.2;
  transition: color 0.3s;
}

.chart-container {
  background-color: var(--card-background-color);
  border-radius: var(--border-radius);
  padding: var(--card-padding);
  border: 1px solid var(--highlight-border-color);
  width: 100%;
  max-width: 1280px;
  margin: 0 auto 3rem auto;
  box-shadow: 0 4px 20px var(--hover-shadow-color);
  transition: background-color 0.3s, box-shadow 0.3s;
}

#videoChart {
  width: 100%;
  display: block;
}

.daily-stats-table {
  width: 100%;
  max-width: 1280px;
  background-color: var(--card-background-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--hover-shadow-color);
  margin: 0;
  transition: background-color 0.3s, box-shadow 0.3s;
}

.daily-stats-table h3 {
  text-align: center;
  padding: 1.5rem;
  background-color: var(--primary-color);
  color: #ffffff;
  font-size: 1.4rem;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin: 0;
}

.table-responsive {
  max-height: 600px;
  overflow-x: auto;
  overflow-y: auto;
}

.daily-stats-table table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-family: var(--font-family);
}

.daily-stats-table th,
.daily-stats-table td {
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 1rem;
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

.daily-stats-table th {
  background-color: var(--accent-color);
  color: #ffffff;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: sticky;
  top: 0;
  z-index: 2;
}

.daily-stats-table tr {
  transition: background-color 0.3s, transform 0.3s;
}

.daily-stats-table tr:nth-child(even) {
  background-color: var(--hover-card-background);
}

.daily-stats-table tr:hover {
  background-color: var(--hover-background-color);
}

.daily-stats-table .change {
  font-size: 0.85rem;
  color: var(--muted-text-color);
  margin-left: 0.5rem;
  font-weight: var(--font-weight-medium);
}

.daily-stats-table .change.positive {
  color: #5bdb1f;
  font-weight: var(--font-weight-bold);
}

.daily-stats-table .change.negative {
  color: #db421f;
  font-weight: var(--font-weight-bold);
}

footer {
  width: 100%;
  max-width: 1280px;
  text-align: center;
  padding: 1.5rem;
  margin-top: 2rem;
  color: var(--muted-text-color);
  font-size: 1rem;
  transition: color 0.3s;
}

footer a {
  color: var(--primary-color);
  font-weight: var(--font-weight-medium);
  transition: color 0.3s;
}

footer a:hover {
  color: var(--hover-text-color);
}

footer .fa-heart {
  color: var(--primary-color);
  margin: 0 0.25rem;
}

.profile-image {
  width: 45px !important;
  height: 45px !important;
  border-radius: 50% !important;
  margin-right: 1rem !important;
  margin-left: -0.5rem !important;
  flex-shrink: 0 !important;
}

@media (min-width: 1200px) {
  header h1 {
    font-size: 2rem;
  }

  .video-title {
    font-size: 1.45rem;
  }

  .stat-card .odometer {
    font-size: 1.8rem;
  }

  .stat-card h3 {
    font-size: 1.25rem;
  }

  .daily-stats-table h3 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 0.75rem;
    --header-padding: 1rem;
    --card-padding: 1rem;
    --gap-size: 0.75rem;
    --button-size: 44px;
    --font-size-base: 16px;
  }

  header h1 {
    font-size: 1.5rem;
  }

  header {
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }

  .header-controls {
    width: 100%;
    max-width: none;
    margin-left: 0;
    flex-direction: column;
    gap: 0.75rem;
  }

  .search-bar {
    order: 1;
  }

  .search-bar input {
    font-size: 0.95rem;
  }

  .mobile-buttons {
    order: 2;
    display: flex;
    justify-content: center;
    gap: 0.75rem;
  }

  .video-info-card {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .video-thumbnail {
    margin: 0;
    width: 100%;
    max-width: 280px;
  }

  .video-title {
    font-size: 1.15rem;
  }

  .stats-grid,
  .stats-grid.three-columns {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }

  .stat-card {
    min-height: 110px;
    padding: 0.875rem;
  }

  .stat-card h3 {
    font-size: 0.95rem;
  }

  .stat-card .odometer {
    font-size: 1.3rem;
  }

  .table-responsive {
    max-height: 400px;
  }

  .daily-stats-table th,
  .daily-stats-table td {
    font-size: 0.85rem;
    padding: 0.55rem 0.7rem;
  }

  .daily-stats-table .change {
    display: block;
    margin: 0.125rem 0 0 0;
    font-size: 0.75rem;
  }

  .chart-container {
    min-height: var(--chart-height);
    height: var(--chart-height);
    padding: 0.75rem;
  }
}

@media (min-width: 481px) and (max-width: 768px) {
  :root {
    --container-padding: 1rem;
    --header-padding: 1.25rem;
    --card-padding: 1.25rem;
    --gap-size: 1rem;
  }

  header {
    flex-direction: column;
    gap: 1rem;
  }

  .header-controls {
    width: 100%;
    max-width: none;
    margin-left: 0;
  }

  .video-info-card {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .video-thumbnail {
    margin: 0;
    width: 100%;
    max-width: 300px;
  }

  .stats-grid,
  .stats-grid.three-columns {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .header-controls {
    max-width: 500px;
  }

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .video-info-card {
    flex-direction: row;
    text-align: left;
  }

  .video-thumbnail {
    margin-right: 1.5rem;
    width: 200px;
  }
}

@media (min-width: 1025px) and (max-width: 1280px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1281px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (hover: none) and (pointer: coarse) {
  .stat-card:hover,
  .video-info-card:hover,
  .video-thumbnail:hover,
  .dropdown-list-item:hover,
  .daily-stats-table tr:hover {
    transform: none;
    background-color: inherit;
    color: inherit;
    box-shadow: inherit;
  }

  .stat-card {
    cursor: pointer;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
  }

  .stat-card:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
  }

  .theme-toggle,
  .export-button {
    min-width: 44px;
    min-height: 44px;
  }
}

@media (max-width: 768px) and (orientation: landscape) and (max-height: 500px) {
  :root {
    --container-padding: 0.5rem;
    --header-padding: 0.75rem;
    --card-padding: 0.75rem;
  }

  header {
    margin-bottom: 1rem;
  }

  .video-info-card {
    flex-direction: row;
    text-align: left;
    margin-bottom: 1rem;
  }

  .video-thumbnail {
    width: 120px;
    margin-right: 1rem;
  }

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
    margin-bottom: 1rem;
  }

  .stat-card {
    min-height: 85px;
    padding: 0.5rem;
  }

  .table-responsive {
    max-height: 300px;
  }
}

@media (max-width: 360px) {
  :root {
    --container-padding: 0.5rem;
    --header-padding: 0.75rem;
    --card-padding: 0.75rem;
    --gap-size: 0.5rem;
  }

  .stats-grid {
    gap: 0.5rem;
  }

  .stat-card {
    min-height: 95px;
    padding: 0.75rem;
  }
}