:root {
    --color-bg: #f8fafc;
    --color-bg-light: #ffffff;
    --color-bg-dark: #f1f5f9;
    --color-border: #e2e8f0;
    --color-text: #0f172a;
    --color-text-light: #64748b;
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-danger: #ef4444;
    --color-danger-dark: #dc2626;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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


#app-container {
    display: flex;
    margin-top: 0%;
    flex-direction: column;
    height: 95vh;
}

#main-header {
    display: flex;
    margin-top: 0%;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 60px;
    background-color: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
    opacity: 0.9;
}

#main-header h1 {
    font-size: 20px;
    font-weight: 600;
    align-self: center;
}

.header-actions {
    display: flex;
    gap: 12px;
}

.action-btn {
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg-light);
    color: var(--color-text);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

.action-btn:hover {
    background-color: var(--color-bg-dark);
}

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

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

.action-btn.danger-btn {
    background-color: var(--color-danger);
    border-color: var(--color-danger);
    color: white;
}

.action-btn.danger-btn:hover {
    background-color: var(--color-danger-dark);
}

#main-content {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
}

#left-sidebar, #right-sidebar {
    width: 240px;
    background-color: var(--color-bg-light);
    border-right: 1px solid var(--color-border);
    padding: 16px;
    overflow-y: auto;
    flex-shrink: 0;
}

#right-sidebar {
    border-right: none;
    border-left: 1px solid var(--color-border);
}

.sidebar-section {
    margin-bottom: 24px;
}

.sidebar-section h3 {
    font-size: 16px;
    margin-bottom: 12px;
    color: #0f172a;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 8px;
}

.tool-palette {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 8px;
}

.tool-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 40px;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg-light);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}
.tool-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tool-btn svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-light);
}

.tool-btn:hover, .tool-btn.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}
.tool-btn:hover svg, .tool-btn.active svg {
    color: white;
}

.shape-palette {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.shape-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    background-color: var(--color-bg-light);
    transition: background-color 0.2s;
}

.shape-item:hover {
    background-color: #eef2ff;
    border-color: var(--color-primary);
}

.shape-item svg {
    width: 32px;
    height: 32px;
    margin-bottom: 4px;
}

.shape-item span {
    font-size: 12px;
    color: var(--color-text-light);
    text-align: center;
}

#canvas-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background-color: var(--color-bg-dark);
}

#canvas-toolbar {
    position: absolute;
    top: 16px;
    left: 16px;
    display: flex;
    gap: 8px;
    background-color: var(--color-bg-light);
    padding: 8px;
    border-radius: 6px;
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 4px;
    border-right: 1px solid var(--color-border);
    padding-right: 8px;
    background: #b9b9d9;
}
.tool-group:last-child {
    border-right: none;
    padding-right: 0;
}

#canvas-toolbar button {
    background: none;
    border: none;
    padding: 4px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}
#canvas-toolbar button:hover {
    background-color: var(--color-bg-dark);
}
#canvas-toolbar button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}
#canvas-toolbar button.active {
    background-color: var(--color-primary);
    color: white;
}
#canvas-toolbar button.active svg {
    color: white;
}
#canvas-toolbar svg {
    width: 20px;
    height: 20px;
    color: var(--color-text);
}


#zoomLevel {
    padding: 0 8px;
    font-weight: 500;
}
#gridToggle.active {
    background-color: var(--color-primary);
    color: rgb(54, 53, 53);
}


.main-canvas {
    width: 100%;
    height: 100%;
    cursor: default;
}
.main-canvas.drawing { cursor: crosshair; }
.main-canvas.panning { cursor: grabbing; }
.main-canvas.move-mode { cursor: grab; }
.main-canvas.select-mode { cursor: default; }

.flowchart-shape {
    cursor: pointer;
}
.flowchart-shape.selected > :first-child {
    stroke: var(--color-primary);
    stroke-width: 3;
    stroke-dasharray: 5, 2;
}

.flowchart-shape.dragging {
    opacity: 0.7;
}

.connection-line {
    pointer-events: none;
}
.temp-arrow {
    stroke: var(--color-primary);
    stroke-width: 2;
    stroke-dasharray: 4, 4;
}
.resize-handle {
    fill: rgb(45, 44, 44);
    stroke: var(--color-primary);
    stroke-width: 1.5;
}
.nw-resize, .se-resize { cursor: nwse-resize; }
.ne-resize, .sw-resize { cursor: nesw-resize; }
.n-resize, .s-resize { cursor: ns-resize; }
.e-resize, .w-resize { cursor: ew-resize; }


#propertiesContent {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.property-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.property-group label {
    font-weight: 500;
    color: var(--color-text-light);
}
.form-control, .color-input {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 14px;
}
.color-input {
    padding: 2px;
    height: 32px;
}
.image-preview {
    max-width: 80px;
    max-height: 80px;
    margin-top: 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    display: block;
}
.small-btn {
    margin-top: 4px;
    padding: 4px 8px;
    font-size: 12px;
    align-self: flex-start;
    background-color: var(--color-bg-dark);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
}
.simple-size-control {
    display: flex;
    align-items: center;
    gap: 8px;
}
.simple-size-control .size-btn {
    border: 1px solid var(--color-border);
    background: rgb(62, 61, 61);
    width: 24px;
    height: 24px;
    border-radius: 4px;
    cursor: pointer;
}
.simple-size-control span {
    font-size: 12px;
    min-width: 40px;
    text-align: center;
}


/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: block;
    opacity: 1;
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    position: relative;
    transform: translateY(-50px);
    transition: transform 0.3s ease;
}
.modal.show .modal-content {
    transform: translateY(0);
}
.modal-content.wide {
    max-width: 700px;
}


.close {
    color: #aaa;
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

.modal h3 {
    margin-top: 0;
    margin-bottom: 16px;
}
.modal p {
    margin-bottom: 16px;
}

.export-options, .modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 20px;
}

.export-btn {
    padding: 10px 20px;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg-light);
    color: var(--color-text);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

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

.template-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.template-item, .project-item {
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}
.template-item:hover, .project-item:hover {
    border-color: var(--color-primary);
    background-color: #eef2ff;
}
.template-item h4, .project-item h4 {
    margin: 0 0 4px;
    font-size: 16px;
}
.template-item p, .project-item small {
    margin: 0;
    font-size: 13px;
    color: var(--color-text-light);
}

#projectsList {
    max-height: 400px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#textEditorModal textarea {
    width: 100%;
    margin-bottom: 16px;
    font-family: inherit;
    font-size: 16px;
    padding: 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}
.text-properties {
    display: flex;
    gap: 20px;
    align-items: center;
    background: var(--color-bg-dark);
    padding: 12px;
    border-radius: 6px;
}
.prop-item {
    display: flex;
    align-items: center;
    gap: 8px;
}
.prop-item label {
    font-weight: 500;
}
#fontSizeDisplay {
    min-width: 40px;
}
#textColorPicker {
    padding: 0;
    border: none;
    width: 28px;
    height: 28px;
}

/* Notification System */
#notificationContainer {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    pointer-events: none;
}
.notification {
    background-color: rgba(15, 23, 42, 0.9);
    color: white;
    padding: 12px 20px;
    border-radius: 6px;
    margin-bottom: 10px;
    font-size: 14px;
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.3s, fadeOut 0.3s 2.7s;
}
.notification.notification-success { background-color: rgba(34, 197, 94, 0.9); }
.notification.notification-error { background-color: rgba(239, 68, 68, 0.9); }
.notification.notification-info { background-color: rgba(59, 130, 246, 0.9); }

@keyframes fadeIn { from { opacity: 0; transform: translateX(100%); } to { opacity: 1; transform: translateX(0); } }
@keyframes fadeOut { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(100%); } }


/* Tutorial modal and button styles */
.tutorial-btn {
  background: #3b82f6;
  color: #fff;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  box-shadow: 0 6px 24px 0 rgba(59,130,246,0.18);
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.tutorial-btn:hover {
  background: #2563eb;
}

.tutorial-modal {
  display: none;
  position: fixed;
  z-index: 10000;
  left: 0; top: 0; width: 100%; height: 100%;
  overflow: auto;
  background: rgba(30,41,59,0.69);
  animation: fadeIn 0.3s;
}

.tutorial-modal.show {
  display: block;
}

.tutorial-content {
  background: #fff;
  padding: 36px 32px 28px 32px;
  border-radius: 12px;
  max-width: 60%;
  margin: 5vw auto;
  position: relative;
  font-size: 1.02rem;
  color: #1e293b;
  box-shadow: 0 12px 36px rgba(59,130,246,0.10);
}

.tutorial-content h2 {
  margin-top: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: #3b82f6;
  margin-bottom: 18px;
}
.tutorial-content strong { color: #2563eb; }
.tutorial-content .close, .tutorial-close {
  position: absolute; right: 16px; top: 18px;
  font-size: 2rem; color: #64748b;
  cursor: pointer; font-weight: bold; background: none; border: none;
  transition: color 0.15s;
}
.tutorial-content .close:hover, .tutorial-close:hover { color: #ef4444; }
@media (max-width: 700px) {
  .tutorial-content {
    padding: 16px 5vw 14px 5vw;
    max-width: 98vw;
    font-size: 0.98rem;
  }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}