:root {
  color-scheme: dark;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  background-color: #0d1117;
  color: #f0f6fc;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, rgba(88, 166, 255, 0.08), transparent 55%), #0d1117;
}

main {
  max-width: 1040px;
  margin: 0 auto;
  padding: clamp(16px, 5vw, 40px);
}

h1,
h2,
h3,
h4 {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: #f0f6fc;
  margin: 0;
}

p {
  margin: 0;
  color: #c9d1d9;
}

.app-header {
  margin-bottom: clamp(24px, 5vw, 40px);
}

.app-header h1 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.app-header h1 span {
  font-size: 1.8rem;
}

.app-header p {
  margin-top: 10px;
  max-width: 100%;
  line-height: 1.7;
}

.control-panel,
.pagination-panel {
  background: rgba(22, 27, 34, 0.92);
  border: 1px solid #30363d;
  border-radius: 14px;
  padding: clamp(16px, 4vw, 24px);
  margin-bottom: clamp(20px, 4vw, 32px);
  box-shadow: 0 10px 30px rgba(2, 12, 27, 0.35);
}

.control-panel h2 {
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 18px;
}

.field:last-of-type {
  margin-bottom: 0;
}

.field-label {
  font-weight: 600;
  color: #9ebdf2;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.radio-group,
.per-page-group {
  display: flex;
  flex-wrap: wrap;
  gap: 20px !important;
}

.radio-pill input,
.per-page-option input {
  display: none;
}

.radio-pill span,
.per-page-option span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 30px;
  border: 1px solid #30363d;
  background: rgba(15, 18, 25, 0.85);
  color: #c9d1d9;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  min-width: 100px;
  max-width: 200px;
}

.radio-pill input:checked + span,
.per-page-option input:checked + span {
  border-color: #1f6feb;
  color: #fff;
  background: #1f6feb;
  box-shadow: 0 6px 18px rgba(31, 111, 235, 0.28);
}

select,
button,
textarea {
  font-family: inherit;
}

select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #30363d;
  background: rgba(15, 18, 25, 0.85);
  color: #f0f6fc;
  font-size: 0.95rem;
}

.cards {
  display: grid;
  gap: clamp(16px, 3vw, 24px);
}

.card {
  border: 1px solid rgba(48, 54, 61, 0.85);
  border-radius: 14px;
  padding: clamp(18px, 3vw, 28px);
  background: rgba(13, 17, 23, 0.92);
  box-shadow: 0 18px 32px rgba(2, 12, 27, 0.45);
}

.card h3 {
  font-size: 1.15rem;
  color: #58a6ff;
  margin-bottom: 14px;
}

.card-section {
  border-top: 1px solid rgba(48, 54, 61, 0.7);
  padding-top: 14px;
  margin-top: 18px;
}

.card-section:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.card-section h4 {
  font-size: 0.95rem;
  color: #79c0ff;
  margin-bottom: 8px;
}

.card-section ul {
  margin: 0;
  padding-left: 20px;
  color: #c9d1d9;
}

.card-section li {
  margin-bottom: 6px;
  line-height: 1.6;
}

.card-section p {
  margin: 0;
  line-height: 1.7;
}

.summary {
  margin-bottom: clamp(16px, 3vw, 24px);
  font-size: 0.95rem;
  color: #9ebdf2;
}

.pagination-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.pagination-panel button {
  flex: none;
  border: 1px solid #30363d;
  background: rgba(15, 18, 25, 0.9);
  color: #f0f6fc;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, border 0.2s ease;
}

.pagination-panel button:hover:not([disabled]) {
  border-color: #1f6feb;
  color: #fff;
}

.pagination-panel button[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

.page-info {
  flex: 1;
  text-align: center;
  font-size: 0.95rem;
  color: #c9d1d9;
}

@media (max-width: 720px) {
  .pagination-panel {
    flex-direction: column;
    align-items: stretch;
  }

  .pagination-panel button {
    width: 100%;
  }

  .page-info {
    width: 100%;
    text-align: center;
  }
}

/* User section styles */
.user-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #30363d;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-name {
  color: #c9d1d9;
  font-size: 0.9rem;
}

.logout-btn {
  background-color: #da3633;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.logout-btn:hover {
  background-color: #b91c1c;
}

.login-btn-header {
  background-color: #238636;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.login-btn-header:hover {
  background-color: #2ea043;
}

/* Task card styles with toggle */
.card {
  background-color: #161b22;
  border: 1px solid #30363d;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  transition: all 0.2s ease;
}

.card.completed {
  background-color: rgba(35, 134, 54, 0.1);
  border-color: rgba(35, 134, 54, 0.3);
}

.card.completed h3 {
  color: #3fb950;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  gap: 1rem;
}

.task-toggle {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.task-checkbox {
  display: none;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
}

.toggle-slider {
  width: 44px;
  height: 24px;
  background-color: #30363d;
  border-radius: 12px;
  position: relative;
  transition: background-color 0.2s ease;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  background-color: #f0f6fc;
  border-radius: 50%;
  top: 3px;
  left: 3px;
  transition: transform 0.2s ease;
}

.task-checkbox:checked + .toggle-label .toggle-slider {
  background-color: #238636;
}

.task-checkbox:checked + .toggle-label .toggle-slider::before {
  transform: translateX(20px);
}

.toggle-text {
  font-size: 0.875rem;
  color: #8b949e;
  transition: color 0.2s ease;
}

.task-checkbox:checked + .toggle-label .toggle-text {
  color: #3fb950;
  font-weight: 500;
}

@media (max-width: 540px) {
  main {
    padding: clamp(14px, 6vw, 28px);
  }

  .control-panel,
  .pagination-panel {
    padding: clamp(14px, 6vw, 20px);
  }

  .radio-group,
  .per-page-group {
    flex-direction: column;
    gap: 12px;
  }

  .radio-pill span,
  .per-page-option span {
    width: 100%;
    justify-content: center;
  }

  .card-header {
    flex-direction: column;
    align-items: stretch;
  }

  .task-toggle {
    align-self: flex-end;
  }

  .user-section {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }

  .user-info {
    justify-content: center;
  }
}

@media (max-width: 541px) {
  .radio-group {
    flex-direction: column;
    gap: 12px;
  }
}

/* Main content visibility for authentication */
.main-content {
  display: none;
}

.main-content.authenticated {
  display: block;
}