* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  height: 100vh;
  width: 100%;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  overflow: hidden;
}

header {
  height: 60px;
  width: 100%;
  display: flex;
  align-items: center;
  padding: 0 20px;
  background-color: rgba(255, 255, 255, 0.8);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.img {
  margin-left: 20px;
  height: 40px;
  width: 60px;
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.img:hover {
  transform: scale(1.1);
}

.main {
  display: flex;
  padding: 20px;
  height: calc(100vh - 60px);
  gap: 20px;
}

.sidebar {
  height: 100%;
  width: 22%;
  text-align: center;
  border-radius: 15px;
  transition: transform 0.3s ease;
}

.sidebar:hover {
  transform: translateX(5px);
}

canvas {
  background-color: white;
  height: 100%;
  width: 76%;
  border: none;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  border-radius: 20px;
  transition: box-shadow 0.3s ease;
}

canvas:hover {
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.container {
  display: flex;
  height: 100%;
  width: 100%;
}

.tools-board {
  width: 100%;
  height: 100%;
  border-radius: 20px;
  background-color: rgba(255, 255, 255, 0.9);
  padding: 20px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  overflow-y: auto;
  scrollbar-width: thin;
}

.tools-board::-webkit-scrollbar {
  width: 6px;
}

.tools-board::-webkit-scrollbar-thumb {
  background-color: #c3cfe2;
  border-radius: 10px;
}

.tools-board .row {
  margin-bottom: 25px;
}

.row .title {
  color: #333;
  font-size: 1.1rem;
  margin-bottom: 10px;
  display: block;
  position: relative;
  padding-bottom: 5px;
}

.row .title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, #6a11cb 0%, #2575fc 100%);
  border-radius: 10px;
  transition: width 0.3s ease;
}

.row:hover .title::after {
  width: 60px;
}

.row .options {
  list-style: none;
  margin: 10px 0 0 5px;
}

.row .options .option {
  display: flex;
  cursor: pointer;
  align-items: center;
  margin-bottom: 12px;
  padding: 8px 10px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.option:hover {
  background-color: rgba(195, 207, 226, 0.3);
  transform: translateX(5px);
}

.option.active {
  background: linear-gradient(90deg, rgba(106, 17, 203, 0.1) 0%, rgba(37, 117, 252, 0.1) 100%);
  transform: translateX(5px);
}

.option i {
  font-size: 1.1rem;
  color: #555;
  transition: transform 0.3s ease, color 0.3s ease;
}

.option:hover i,
.option.active i {
  color: #2575fc;
  transform: scale(1.2);
}

.option span,
.option label {
  color: #555;
  cursor: pointer;
  padding-left: 10px;
  transition: color 0.3s ease;
}

.option:hover span,
.option:hover label,
.option.active span,
.option.active label {
  color: #2575fc;
}

.option #fill-color {
  height: 16px;
  width: 16px;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.option #fill-color:checked {
  transform: scale(1.2);
}

#fill-color:checked ~ label {
  color: #2575fc;
}

.option #size-slider {
  width: 100%;
  height: 6px;
  margin-top: 10px;
  border-radius: 10px;
  background: #e0e0e0;
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.option #size-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  cursor: pointer;
  transition: transform 0.2s ease;
}

.option #size-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.colors .options {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.colors .option {
  height: 25px;
  width: 25px;
  border-radius: 50%;
  margin-top: 3px;
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.colors .option:hover {
  transform: scale(1.2);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

.colors .option:nth-child(1) {
  background-color: #fff;
  border: 1px solid #bfbfbf;
}

.colors .option:nth-child(2) {
  background-color: black;
}

.colors .option:nth-child(3) {
  background-color: #ef4415;
}

.colors .option:nth-child(4) {
  background-color: #4caf50;
}

.colors .option:nth-child(5) {
  background-color: #c1f40a;
}

.colors .option.selected {
  transform: scale(1.2);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

.colors .option.selected::before {
  position: absolute;
  content: "";
  height: 12px;
  top: 50%;
  left: 50%;
  width: 12px;
  background: inherit;
  border-radius: inherit;
  border: 2px solid #fff;
  transform: translate(-50%, -50%);
}

.colors .option:first-child.selected::before {
  border-color: #ccc;
}

.option #color-picker {
  opacity: 0;
  cursor: pointer;
}

.buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.buttons button {
  width: 80%;
  color: #fff;
  border: none;
  outline: none;
  font-size: 0.95rem;
  padding: 10px 0;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.buttons button::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
  z-index: -1;
}

.buttons button:hover::before {
  width: 100%;
}

.buttons button:active {
  transform: scale(0.95);
}

.buttons .clear-canvas {
  background: linear-gradient(135deg, #ff9a9e 0%, #fad0c4 100%);
  box-shadow: 0 4px 15px rgba(255, 154, 158, 0.5);
}

.buttons .save-img {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.5);
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(37, 117, 252, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(37, 117, 252, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(37, 117, 252, 0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.row {
  animation: fadeIn 0.5s ease forwards;
}

.row:nth-child(1) {
  animation-delay: 0.1s;
}

.row:nth-child(2) {
  animation-delay: 0.2s;
}

.row:nth-child(3) {
  animation-delay: 0.3s;
}

.row:nth-child(4) {
  animation-delay: 0.4s;
}

/* Tool selection animation */
.tool-animation {
  animation: pulse 1s;
}

/* Button click animation */
.button-click {
  animation: buttonClick 0.5s ease;
}

@keyframes buttonClick {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
  }
}

/* Responsive CSS */
@media screen and (max-width: 1200px) {
  .main {
    padding: 15px;
    gap: 15px;
  }
  
  .sidebar {
    width: 25%;
  }
  
  canvas {
    width: 73%;
  }
  
  .tools-board {
    padding: 15px;
  }
}

@media screen and (max-width: 992px) {
  .sidebar {
    width: 30%;
  }
  
  canvas {
    width: 68%;
  }
  
  .row .title {
    font-size: 1rem;
  }
  
  .option i {
    font-size: 1rem;
  }
  
  .option span, 
  .option label {
    font-size: 0.9rem;
  }
  
  .buttons button {
    font-size: 0.9rem;
    width: 90%;
  }
}

@media screen and (max-width: 768px) {
  header h1 {
    font-size: 1.5rem;
  }
  
  .main {
    flex-direction: column;
    gap: 15px;
    height: calc(100vh - 60px);
    overflow-y: auto;
  }
  
  .sidebar {
    width: 100%;
    height: auto;
    order: 2;
  }
  
  .sidebar:hover {
    transform: none;
  }
  
  canvas {
    width: 100%;
    height: 50vh;
    order: 1;
  }
  
  .tools-board {
    height: auto;
    max-height: 50vh;
  }
  
  .colors .options {
    justify-content: flex-start;
    gap: 15px;
  }
}

@media screen and (max-width: 576px) {
  header {
    padding: 0 10px;
  }
  
  .img {
    margin-left: 10px;
    height: 35px;
    width: 50px;
  }
  
  header h1 {
    margin-left: 10px;
    font-size: 1.2rem;
  }
  
  .main {
    padding: 10px;
  }
  
  canvas {
    height: 40vh;
  }
  
  .tools-board {
    padding: 15px 10px;
  }
  
  .row .options .option {
    padding: 6px 8px;
  }
  
  .buttons {
    gap: 10px;
  }
  
  .buttons button {
    padding: 8px 0;
  }
}

@media screen and (max-width: 400px) {
  .colors .options {
    gap: 10px;
  }
  
  .colors .option {
    height: 22px;
    width: 22px;
  }
  
  .option i {
    font-size: 0.9rem;
  }
  
  .option span, 
  .option label {
    font-size: 0.8rem;
    padding-left: 8px;
  }
}

/* Handle landscape orientation on mobile */
@media screen and (max-height: 500px) and (orientation: landscape) {
  .main {
    flex-direction: row;
    overflow-y: auto;
  }
  
  .sidebar {
    width: 35%;
    order: 1;
  }
  
  canvas {
    width: 65%;
    height: calc(100vh - 80px);
    order: 2;
  }
  
  .tools-board {
    max-height: calc(100vh - 80px);
  }
}
#undo-btn,
#redo-btn {
  width: 45%;
  padding: 8px;
  
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 10px;
}

#undo-btn:hover,
#redo-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(245, 87, 108, 0.3);
}

#undo-btn:active,
#redo-btn:active {
  transform: translateY(0);
}