:root {
  /* Light Theme (Default) */
  --bg-primary: #f4f7f9;
  --bg-secondary: #ffffff;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-secondary: #10b981;
  --color-secondary-hover: #059669;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --border-radius: 16px;
  --bottom-nav-height: 70px;
}

body.dark-mode {
  /* Dark Theme */
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-secondary: #10b981;
  --color-secondary-hover: #34d399;
  --color-danger: #f87171;
  --color-danger-hover: #fb923c;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --border-color: #374151;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overscroll-behavior-y: contain;
  transition: background-color 0.3s, color 0.3s;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: -webkit-fill-available;
}

header {
  background: var(--bg-secondary);
  padding: 15px 20px;
  flex-shrink: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s, border-color 0.3s;
}

h1 {
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.5rem;
}

.theme-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, background-color 0.2s;
}
.theme-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

.content-wrapper {
  flex-grow: 1;
  overflow-y: auto;
  padding: 20px;
  padding-bottom: calc(var(--bottom-nav-height) + 20px);
}

.tab-pane {
  display: none;
  animation: fadeIn 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

.card {
  background: var(--bg-secondary);
  padding: 20px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-bottom: 25px;
  transition: background-color 0.3s;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.card-header h2, .card-header h3 {
  margin-bottom: 0;
  border-bottom: none;
  padding-bottom: 0;
}

h2 {
  margin-bottom: 20px;
  font-size: 1.5rem;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  transition: border-color 0.3s;
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background-color: var(--bg-secondary);
  display: flex;
  justify-content: space-around;
  box-shadow: 0 -5px 15px -5px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  border-top: 1px solid var(--border-color);
  transition: background-color 0.3s, border-color 0.3s;
}

.nav-button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-grow: 1;
  background-color: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 5px 0;
  cursor: pointer;
  transition: color 0.2s ease-in-out;
  position: relative;
}
.nav-button i {
  font-size: 22px; /* Correctly size the font icon */
  width: 24px;     /* Provide a consistent box size */
  height: 24px;
  margin-bottom: 4px;
  display: flex;     /* Center the icon inside the box */
  align-items: center;
  justify-content: center;
}
.nav-button span {
  font-size: 0.7rem;
  font-weight: 500;
}
.nav-button.active {
  color: var(--color-primary);
}
.nav-button:hover:not(.active) {
  color: var(--text-primary);
}
.nav-button.active::after {
  content: '';
  position: absolute;
  bottom: 8px;
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: 50%;
}


/* Checklists */
.checklist { list-style: none; }
.checklist li {
  display: flex;
  align-items: center;
  padding: 14px 5px;
  border-bottom: 1px solid var(--border-color);
  gap: 5px;
  transition: border-color 0.3s, box-shadow 0.2s, background-color 0.2s;
}
.checklist li:last-child {
  border-bottom: none;
}
.checklist input[type="checkbox"] {
  width: 22px;
  height: 22px;
  cursor: pointer;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}
.checklist .item-text {
  flex-grow: 1;
  border: none;
  padding: 5px;
  background: transparent;
  font-size: 1rem;
  color: var(--text-primary);
}
.checklist .item-text.completed {
  text-decoration: line-through;
  color: var(--text-secondary);
}
.checklist .item-text:focus {
    outline: none;
    background: var(--bg-primary);
    border-radius: 6px;
}


.add-item-form {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
input[type="text"], input[type="number"], input[type="text"]:disabled {
  width: 100%;
  padding: 14px 15px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  font-size: 16px;
  transition: border-color 0.3s ease, background-color 0.3s;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}
input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent);
}
input:disabled { background-color: var(--bg-primary); cursor: not-allowed; }

button {
  padding: 14px 20px;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  color: #fff;
}
button:active {
    transform: scale(0.98);
}
.btn-primary { background-color: var(--color-primary); }
.btn-primary:hover { background-color: var(--color-primary-hover); }
.btn-secondary { background-color: var(--color-secondary); }
.btn-secondary:hover { background-color: var(--color-secondary-hover); }
.btn-danger { background-color: var(--color-danger); }
.btn-danger:hover { background-color: var(--color-danger-hover); }

.btn-small { padding: 6px 12px; font-size: 0.8rem; border-radius: 8px; }
.checklist li button.btn-danger {
    background: none;
    color: var(--text-secondary);
    font-size: 1rem;
    padding: 4px 8px;
}
.checklist li button.btn-danger:hover {
    background: var(--color-danger);
    color: #fff;
}


.checklist-footer { margin-top: 20px; text-align: center; }
.completion-message {
  background-color: color-mix(in srgb, var(--color-secondary) 15%, var(--bg-secondary));
  border-left: 5px solid var(--color-secondary);
  border-radius: var(--border-radius);
  padding: 25px;
  text-align: center;
  margin: 20px 0;
}
.completion-message h3 { margin-bottom: 10px; color: var(--text-primary)}
.completion-message p { color: var(--text-secondary)}
.completion-message button { margin-top: 15px; }

/* --- Edit/Reorder Buttons --- */
.btn-reorder {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.btn-reorder:hover {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Generic Drag & Drop Styles */
.drag-handle {
    cursor: grab;
    color: var(--text-secondary);
    padding: 10px 5px 10px 0;
    transition: color 0.2s;
    user-select: none;
}
.drag-handle:hover {
    color: var(--text-primary);
}
.dragging {
    opacity: 0.9;
    background: var(--bg-secondary);
    transform: scale(0.95);
    box-shadow: var(--shadow);
}
.dragging .drag-handle {
    cursor: grabbing;
}
.drag-over {
    box-shadow: inset 0 2px 0 var(--color-primary);
}
ul.drag-over-end, tbody.drag-over-end {
    box-shadow: inset 0 -3px 0 var(--color-primary);
    padding-bottom: 3px;
}


/* Vehicle Data Form */
.form-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }

/* Payload Calculator */
.payload-summary { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-bottom: 25px; text-align: center; }
.summary-card { background-color: var(--bg-primary); padding: 15px; border-radius: var(--border-radius); transition: background-color 0.3s; }
.summary-card h4 { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 5px; font-weight: 500; text-transform: uppercase; }
.summary-card p { font-size: 1.4rem; font-weight: 700; color: var(--text-primary); }
.summary-card p.negative { color: var(--color-danger); }

.payload-footer {
    display: none; /* Hidden by default, shown in detail mode */
    margin-top: 20px;
}
.payload-footer button { width: 100%; }
.detail-mode .payload-footer {
    display: flex;
}

/* --- Payload Table: Mobile-First --- */
/* Default View: Compact List */
.payload-table { width: 100%; }
.payload-table thead { display: none; }
.payload-table, .payload-table tbody, .payload-table tr { display: block; }

.payload-item {
    transition: background-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.payload-item.drag-over {
    margin-bottom: 0 !important; /* Reset margin from detail view */
}

/* Default compact row style */
.payload-table tr {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    background: transparent;
    padding: 10px 5px;
    margin-bottom: 0;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
}
.payload-table tr:last-child {
    border-bottom: none;
}
.payload-table td {
    display: none; /* Hide all cells by default */
    padding: 0;
    border: none;
}
.payload-table .handle-cell,
.payload-table td[data-label="Beschreibung"] {
    display: flex; /* Show only handle and description */
}
.payload-table .handle-cell {
    order: 0;
    width: auto;
    align-items: center;
}
.payload-table .handle-cell .drag-handle {
    padding-left: 0;
}
.payload-table td[data-label="Beschreibung"] {
    flex-grow: 1;
    flex-direction: column;
    align-items: flex-start;
    padding: 0 10px;
    gap: 2px;
}
.payload-table td[data-label="Beschreibung"]::before {
    content: attr(data-text);
    color: var(--text-primary);
    font-weight: 500;
}
.payload-table td[data-label="Beschreibung"]::after {
    content: attr(data-weight-text);
    color: var(--text-secondary);
    font-size: 0.8rem;
}
.payload-table td[data-label="Beschreibung"] input {
    display: none; /* This hides the input in the default view */
}


/* Detail Mode: Card List on Mobile */
.detail-mode .payload-table tr {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 15px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    border-bottom: none;
}
.detail-mode .payload-table td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    width: 100%;
}
.detail-mode .payload-table td[data-label="Beschreibung"] {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}
.detail-mode .payload-table td:last-child { border-bottom: none; }
.detail-mode .payload-table td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--text-secondary);
}

/* In detail mode, force the 'Beschreibung' cell to show its label like other cells, overriding compact view styles. */
.detail-mode .payload-table td[data-label="Beschreibung"]::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--text-secondary);
}

/* Hide the compact-view-only total weight text in detail mode */
.detail-mode .payload-table td[data-label="Beschreibung"]::after {
    display: none;
}


.detail-mode .payload-table input { display: inline-block; width: 50%; padding: 8px; font-size: 16px; text-align: right; background-color: var(--bg-primary); }
.detail-mode .payload-table td[data-label="Beschreibung"] input {
    display: block;
    width: 100%;
    text-align: left;
}
.detail-mode .payload-table .action-cell { display: block; text-align: right; padding-top: 10px; }
.detail-mode .payload-table .action-cell button { float: right; }
.detail-mode .payload-table .action-cell button.btn-danger {
    background: none;
    color: var(--text-secondary);
}
.detail-mode .payload-table .action-cell button.btn-danger:hover {
    background-color: var(--color-danger);
    color: #fff;
}
.detail-mode .payload-table td.handle-cell {
    width: auto;
    order: -1; /* Make handle appear first */
    border-bottom: none;
    padding: 0 10px 10px 0;
}
.detail-mode .payload-table td.handle-cell::before {
    display: none;
}
.detail-mode .payload-table td.handle-cell .drag-handle {
    margin: 0;
    padding: 10px;
}


/* --- Tablet and Desktop Styles --- */
@media (min-width: 768px) {
  body { padding-bottom: 0; }
  #app { max-width: 900px; margin: 2rem auto; height: auto; padding-bottom: 2rem;}
  .content-wrapper { padding: 0; overflow-y: visible; }
  header { padding: 20px 25px; border-radius: var(--border-radius) var(--border-radius) 0 0; border: 1px solid var(--border-color); border-bottom: none;}
  
  .bottom-nav { 
    position: static; 
    height: auto; 
    border-radius: 0 0 var(--border-radius) var(--border-radius); 
    box-shadow: none;
    border: 1px solid var(--border-color);
    border-top: none;
    background-color: var(--bg-secondary);
    padding: 5px;
  }
  .nav-button { flex-direction: row; padding: 12px 10px; border-radius: 12px; }
  .nav-button.active { background-color: var(--bg-primary); }
  .nav-button.active::after { display: none; }
  .nav-button i { margin-right: 8px; margin-bottom: 0; }
  .nav-button span { font-size: 0.9rem; }
  
  main.content-wrapper {
    background: var(--bg-secondary);
    padding: 30px 25px;
    box-shadow: none;
    margin-top: 0;
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
  }

  .add-item-form { flex-direction: row; }
  .form-grid { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
  .payload-summary { grid-template-columns: repeat(3, 1fr); }
  .summary-card p { font-size: 1.5rem; }
  
  /* --- Payload Table: Desktop --- */
  /* Default: Compact Table View */
  .payload-table { display: table; border-collapse: collapse; }
  .payload-table tr { display: table-row; }
  .payload-table td {
      display: none; /* Hide all by default */
      padding: 12px;
      vertical-align: middle;
      border-bottom: 1px solid var(--border-color);
  }
  .payload-table th.handle-col, .payload-table td.handle-cell,
  .payload-table td[data-label="Beschreibung"] {
      display: table-cell;
  }
  .payload-table th.handle-col, .payload-table td.handle-cell {
    width: 40px; padding: 12px 0; text-align: center;
  }
  .payload-table td.handle-cell .drag-handle { padding: 0; }
  .payload-table td[data-label="Beschreibung"]::before,
  .payload-table td[data-label="Beschreibung"]::after {
      display: block; padding: 0;
  }
  
  /* Detail Mode: Full Table View */
  .detail-mode .payload-table thead { display: table-header-group; }
  .detail-mode .payload-table td { display: table-cell; padding: 12px; text-align: left; order: 0; }
  .detail-mode .payload-table td::before { display: none; }
  .detail-mode .payload-table input { display: block; width: 100%; text-align: left; background-color: var(--bg-secondary); }
  .detail-mode .payload-table input[type="number"] { max-width: 80px; }
  .detail-mode .payload-table .action-cell { text-align: right; white-space: nowrap; }
  .detail-mode .payload-table .action-cell button { float: none; margin-left: 5px; }

  /* This ensures the label for "Beschreibung" is visible in detail mode on desktop, placing it above the input field. */
  .detail-mode .payload-table td[data-label="Beschreibung"]::before {
    display: block;
    margin-bottom: 4px;
  }

  .detail-mode .payload-table td[data-label="Beschreibung"]::after {
    display: none;
  }
}