:root {
  --bg-color: #f4f6f9;
  --surface-color: #ffffff;
  --text-main: #2d3748;
  --text-muted: #718096;
  --primary-color: #3182ce;
  --primary-hover: #2b6cb0;
  --border-color: #e2e8f0;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --card-hover-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --column-bg: #edf2f7;
  --column-due-bg: #fff5f5;
  --column-due-border: #feb2b2;
  --column-new-bg: #ebf8ff;
  --column-new-border: #bee3f8;
  --column-done-bg: #f0fff4;
  --column-done-border: #9ae6b4;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Header & Controls */
.app-header {
  background: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-area h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #1a202c;
  letter-spacing: -0.5px;
}

.logo-badge {
  background: #ebf8ff;
  color: #2b6cb0;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease-in-out;
  user-select: none;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}
.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--surface-color);
  border-color: var(--border-color);
  color: var(--text-main);
}
.btn-secondary:hover {
  background: #f7fafc;
  border-color: #cbd5e0;
}

.btn-danger {
  background: #e53e3e;
  color: white;
}
.btn-danger:hover {
  background: #c53030;
}

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
}

.filter-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  background: #edf2f7;
  color: var(--text-main);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.filter-chip.active {
  background: #2d3748;
  color: white;
  font-weight: 600;
}

.color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

/* Board Layout */
.board-container {
  flex: 1;
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem;
  overflow-x: auto;
  overflow-y: hidden;
  align-items: flex-start;
}

.board-column {
  width: 320px;
  min-width: 320px;
  max-height: 100%;
  background: var(--column-bg);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(0, 0, 0, 0.04);
  transition: border-color 0.2s, background-color 0.2s;
}

.board-column.col-new {
  background: var(--column-new-bg);
  border-color: var(--column-new-border);
}

.board-column.col-due {
  background: var(--column-due-bg);
  border-color: var(--column-due-border);
}

.board-column.col-due .col-header h3 {
  color: #c53030;
}

.board-column.col-done {
  background: var(--column-done-bg);
  border-color: var(--column-done-border);
}

.board-column.col-done .col-header h3 {
  color: #276749;
}

.task-card.is-done {
  opacity: 0.82;
  background: #f7fafc;
}

.task-card.is-done .task-title {
  text-decoration: line-through;
  color: #718096;
}

/* Celebration Banner / Toast */
.toast-success {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #276749;
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 20px rgba(0,0,0,0.15);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  z-index: 2000;
  animation: slideUp 0.25s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.col-header {
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  cursor: grab;
  user-select: none;
}

.col-header:active {
  cursor: grabbing;
}

.col-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.col-header h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #2d3748;
}

.col-count {
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.08);
  color: var(--text-main);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}

.col-offset-badge {
  font-size: 0.7rem;
  color: #4a5568;
  background: #e2e8f0;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.task-list {
  padding: 0.75rem;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-height: 80px;
}

.task-list.drag-over {
  background: rgba(49, 130, 206, 0.08);
  border-radius: var(--radius-sm);
}

/* Task Button / Card */
.task-card {
  background: var(--surface-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  box-shadow: var(--card-shadow);
  border-left: 5px solid #a0aec0;
  cursor: grab;
  user-select: none;
  transition: transform 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.task-card:hover {
  box-shadow: var(--card-hover-shadow);
  transform: translateY(-2px);
}

.task-card:active {
  cursor: grabbing;
}

.task-card.dragging {
  opacity: 0.4;
  transform: scale(0.98);
}

.task-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}

.task-title {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.35;
  color: #1a202c;
  word-break: break-word;
}

.task-category {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  color: white;
  white-space: nowrap;
}

.task-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.task-due {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: #dd6b20;
  font-weight: 500;
}

.task-due.overdue {
  color: #e53e3e;
  font-weight: 700;
}

.task-actions {
  display: flex;
  gap: 0.25rem;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.task-card:hover .task-actions {
  opacity: 1;
}

.btn-action-done {
  color: #276749 !important;
  font-weight: 700;
  font-size: 1rem;
}

.btn-action-done:hover {
  background: #c6f6d5 !important;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem;
  border-radius: 4px;
}
.btn-icon:hover {
  background: #edf2f7;
  color: var(--text-main);
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal {
  background: white;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  overflow: hidden;
  animation: modalIn 0.18s ease-out;
}

.modal-wide {
  max-width: 800px;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-body {
  padding: 1.4rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-footer {
  padding: 1rem 1.4rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background: #f7fafc;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-control {
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.15);
}

textarea.form-control {
  min-height: 90px;
  resize: vertical;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background: #edf2f7;
  font-weight: 600;
  color: var(--text-muted);
}

.hidden {
  display: none !important;
}

/* ===================================================
   RESPONSIVE & MOBILE DESIGN (z.B. Galaxy S24 Ultra & Co.)
   =================================================== */
@media (max-width: 768px) {
  body {
    height: auto;
    min-height: 100vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .app-header {
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .header-top {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .logo-area h1 {
    font-size: 1.15rem;
  }

  .header-actions {
    flex-wrap: wrap;
    gap: 0.35rem;
    width: 100%;
    justify-content: flex-start;
  }

  .header-actions .btn {
    padding: 0.45rem 0.65rem;
    font-size: 0.8rem;
  }

  /* Spalten untereinander auf Mobilgeräten */
  .board-container {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
    gap: 1rem;
    overflow-x: hidden;
    overflow-y: visible;
  }

  .board-column {
    width: 100% !important;
    min-width: 0 !important;
    max-height: none !important;
  }

  .task-list {
    min-height: 50px;
    padding: 0.5rem;
  }

  /* Pendenzen-Karten für Touch-Bedienung optimieren */
  .task-card {
    padding: 0.85rem;
    -webkit-tap-highlight-color: transparent;
  }

  .task-card:active {
    transform: scale(0.99);
  }

  .task-actions {
    opacity: 1 !important; /* Immer sichtbar auf Touch-Geräten */
  }

  .btn-icon {
    padding: 0.4rem 0.5rem;
    font-size: 1.1rem;
  }

  .modal {
    max-height: 94vh;
    border-radius: var(--radius-md);
  }

  .modal-body {
    padding: 1rem;
  }
}