* {
    box-sizing: border-box;
}
body {
    margin: 0; padding: 0;
    font-family: "Helvetica Neue", Arial, sans-serif;
    background: #f0f2f5;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px 10px;
}
#app {
    max-width: 1000px;
    width: 100%;
    border-radius: 12px;
    background: white;
    box-shadow:
        0 8px 16px rgb(0 0 0 / 0.1);
    padding: 16px 20px 32px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
h1 {
    margin: 0 0 20px 0;
    font-weight: 700;
    font-size: 1.6rem;
    color: #2c3e50;
    user-select: none;
}
#input-area {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    justify-content: center;
}
#input-area label {
    font-weight: 600;
    font-size: 1rem;
    color: #34495e;
    user-select: none;
}
#input-area input[type=number] {
    border: 1.8px solid #ccc;
    border-radius: 8px;
    outline-offset: 0;
    padding: 6px 12px;
    width: 72px;
    font-size: 1rem;
    text-align: center;
    transition: border-color 0.3s ease;
}
#input-area input[type=number]:focus {
    border-color: #409eff;
}
#input-area button {
    background-color: #409eff;
    border: none;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    padding: 8px 24px;
    border-radius: 12px;
    cursor: pointer;
    transition: background-color 0.25s ease;
    user-select: none;
}
#input-area button:hover {
    background-color: #66b1ff;
}
#tool-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    width: 100%;
    max-width: 980px;
    gap: 24px;
    user-select: none;
}
.board-wrapper {
    position: relative;
    display: flex;
}
.grid-container {
    display: grid;
    background: #fafafa;
    border-radius: 12px;
    box-shadow:
        inset 0 0 3px #bbb;
    user-select: none;
}
.row-inputs, .col-inputs {
    display: grid;
    gap: 3px;
}
.row-inputs {
    grid-auto-flow: row;
    justify-items: right;
    align-content: start;
    padding-right: 6px;
    margin-right: 8px;
    border-right: 1px solid #ddd;
}
.row-inputs input {
    width: 32px;
    text-align: center;
    border: 1.5px solid #ccc;
    border-radius: 8px;
    font-weight: 600;
    user-select: text;
    padding: 4px 6px;
    background: #fff;
    transition: border-color 0.3s ease;
}
.row-inputs input:focus {
    border-color: #409eff;
}
.col-inputs {
    grid-auto-flow: column;
    justify-content: start;
    align-items: center;
    gap: 3px;
    margin-bottom: 8px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 6px;
}
.col-inputs input {
    width: 32px;
    text-align: center;
    border: 1.5px solid #ccc;
    border-radius: 8px;
    font-weight: 600;
    user-select: text;
    padding: 4px 6px;
    background: #fff;
    transition: border-color 0.3s ease;
}
.col-inputs input:focus {
    border-color: #409eff;
}
.corner-box {
    width: 40px;
    height: 40px;
}
#board {
    display: grid;
    background-color: #fff;
    border-radius: 12px;
    box-shadow:
        inset 0 0 5px #ccc;
    user-select: none;
    touch-action: manipulation;
}
.cell {
    border: 1.2px solid #ddd;
    background-color: white;
    border-radius: 8px;
    position: relative;
    cursor: pointer;
    transition:
        background-color 0.3s ease,
        border-color 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}
.cell.disabled {
    background:
        repeating-linear-gradient(
            135deg,
            #aaa,
            #aaa 2px,
            #bbb 2px,
            #bbb 4px
        );
    border-color: #999;
    cursor: pointer;
}
.cell.placed {
    color: #222;
    font-weight: 600;
    z-index: 2;
}
.cell .comp-label {
    position: absolute;
    top: 2px;
    right: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    user-select: none;
    color: rgba(0,0,0,0.3);
}
.cell.disabled::after {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    top: 5px;
    left: 5px;
    background-image:
        linear-gradient(45deg, transparent 44%, #666 45%, #666 55%, transparent 56%),
        linear-gradient(-45deg, transparent 44%, #666 45%, #666 55%, transparent 56%);
    pointer-events: none;
}
#components-panel {
    flex-shrink: 0;
    min-width: 260px;
    max-width: 325px;
    border-radius: 12px;
    background-color: #f9fafb;
    border: 1.5px solid #ddd;
    padding: 14px 14px 20px 14px;
    box-shadow:
        0 4px 10px rgb(0 0 0 / 0.05);
    display: flex;
    flex-direction: column;
    user-select: none;
    max-height: calc(100vh - 200px);
}
#components-panel h2 {
    margin: 0 0 16px 0;
    text-align: center;
    font-weight: 700;
    font-size: 1.3rem;
    color: #34495e;
    flex-shrink: 0;
}
.component-item {
    display: flex;
    align-items: center;
    gap: 12px;
}
#components-scroll-wrapper {
    max-height: 250px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex: 1;
    margin-bottom: 12px;
}
#components-scroll-wrapper::-webkit-scrollbar #preset-list-wrapper::-webkit-scrollbar {
    width: 8px;
}
#components-scroll-wrapper::-webkit-scrollbar-track #preset-list-wrapper::-webkit-scrollbar-track {
    background: #f9fafb;
    border-radius: 8px;
}
#components-scroll-wrapper::-webkit-scrollbar-thumb #preset-list-wrapper::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 8px;
}
#components-scroll-wrapper::-webkit-scrollbar-thumb:hover #preset-list-wrapper::-webkit-scrollbar-thumb:hover {
    background: #999;
}
.comp-icon {
    border-radius: 8px;
    background-color: #fff;
    box-shadow:
        0 0 6px rgb(0 0 0 / 0.1);
    user-select: none;
    flex-shrink: 0;
}
.comp-count-input {
    width: 52px;
    border-radius: 8px;
    border: 1.8px solid #ccc;
    font-weight: 600;
    font-size: 1rem;
    padding: 5px 8px;
    text-align: center;
    background: white;
    transition: border-color 0.3s ease;
}
.comp-count-input:focus {
    border-color: #409eff;
    outline: none;
}

/* Buttons */
.button-group-button {
    font-weight: 700;
    font-size: 1.15rem;
    border: none;
    padding: 10px 40px;
    border-radius: 14px;
    cursor: pointer;
    box-shadow: 0 3px 8px rgb(0 0 0 / 0.15);
    user-select: none;
    transition: background-color 0.3s ease;
    min-width: 120px;
}
.button-start {
    background-color: #e74c3c;
    color: white;
}
.button-start:hover:not(:disabled) {
    background-color: #ff6050;
}
.button-start:disabled {
    background-color: #f5a19a;
    cursor: default;
    box-shadow: none;
}
.button-reset {
    background-color: #5dade2;
    color: white;
}
.button-reset:hover:not(:disabled) {
    background-color: #85c1e9;
}
.button-reset:disabled {
    background-color: #aed6f1;
    cursor: default;
    box-shadow: none;
}
.comp-icon {
    display: grid;
    place-items: center;
    user-select: none;
}
.comp-icon .cell {
    border-width: 1px;
    cursor: default;
    background-color: #fff;
    border-color: #ccc;
}
input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type=number] {
    -moz-appearance: textfield;
}
input[type=checkbox] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}
.cell.disabled[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 8px;
    background: #333;
    color: white;
    font-size: 0.75rem;
    border-radius: 6px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0.85;
    z-index: 10;
}

.button-mode-input {
    border: none;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 6px 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    min-width: 42px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.row-buttons, .col-buttons {
    display: grid;
    gap: 3px;
}
.row-buttons {
    grid-auto-flow: row;
    justify-items: right;
    align-content: start;
    padding-right: 6px;
    margin-right: 8px;
    border-right: 1px solid #ddd;
}
.row-buttons-type2 {
    display: grid;
    gap: 3px;
    padding-right: 6px;
    margin-right: 8px;
    border-right: 1px solid #90caf9;
}
.col-buttons {
    grid-auto-flow: column;
    justify-content: start;
    align-items: center;
    gap: 3px;
    margin-bottom: 8px;
    padding-bottom: 6px;
    border-bottom: 1px solid #ddd;
}
.col-buttons-type2 {
    display: grid;
    grid-auto-flow: column;
    justify-content: start;
    align-items: center;
    gap: 3px;
    margin-bottom: 8px;
    padding-bottom: 6px;
    border-bottom: 1px solid #90caf9;
}

.region-V4 .cell.placed.type1 {
    background-color: rgba(126, 211, 33, 0.6);
    border-color: #5db417;
}
.region-V4 .cell.placed.type2 {
    background-color: rgba(144, 202, 249, 0.6);
    border-color: #1976d2;
}
.region-V4 .cell.locked {
  background-color: #a6f7a6;
  border-color: #59d859;
  background:
    repeating-linear-gradient(
      45deg,
      #a6f7a6,
      #a6f7a6 2px,
      #7ed321 2px,
      #7ed321 4px
    );
}
.region-V4 .cell.locked::after {
  background-image:
    linear-gradient(45deg, transparent 44%, #2ecc40 45%, #2ecc40 55%, transparent 56%),
    linear-gradient(-45deg, transparent 44%, #2ecc40 45%, #2ecc40 55%, transparent 56%);
}
.region-V4 .cell.relocked {
  background-color: #90caf9;
  border-color: #1976d2;
  background:
    repeating-linear-gradient(
      45deg,
      #90caf9,
      #90caf9 2px,
      #64b5f6 2px,
      #64b5f6 4px
    );
}
.region-V4 .cell.relocked::after {
  background-image:
    linear-gradient(45deg, transparent 44%, #1565c0 45%, #1565c0 55%, transparent 56%),
    linear-gradient(-45deg, transparent 44%, #1565c0 45%, #1565c0 55%, transparent 56%);
}
.region-V4 .row-inputs-type2, .region-V4 .col-inputs-type2 {
    display: grid;
    gap: 3px;
    background-color: #e3f2fd;
    border-radius: 4px;
}
.region-V4 .row-inputs-type2 input, .region-V4 .col-inputs-type2 input {
    border: 1.5px solid #90caf9;
    background-color: #f5f9ff;
    width: 32px;
    text-align: center;
    border-radius: 8px;
    font-weight: 600;
    user-select: text;
    padding: 4px 6px;
    transition: border-color 0.3s ease;
}
.region-V4 .button-mode-input.type1 {
  background-color: #7ed321;
  border: 2px solid #5db417;
  box-shadow: 0 2px 6px rgba(126, 211, 33, 0.3);
  color: white;
}
.region-V4 .button-mode-input.type1:hover {
  background-color: #8fdd2f;
  box-shadow: 0 3px 8px rgba(126, 211, 33, 0.4);
}
.region-V4 .button-mode-input.type2 {
  background-color: #64b5f6;
  border: 2px solid #1976d2;
  box-shadow: 0 2px 6px rgba(100, 181, 246, 0.3);
  color: white;
}
.region-V4 .button-mode-input.type2:hover {
  background-color: #90caf9;
  box-shadow: 0 3px 8px rgba(100, 181, 246, 0.4);
}
.region-V4 .comp-count-input.type2 {
    background-color: rgb(227, 242, 253);
    border-color: rgb(144, 202, 249);
}

.region-WL .cell.placed.type1 {
    background-color: #20b2aa;
    border-color: #5db417;
}
.region-WL .cell.placed.type2 {
    background-color: #f5a623;
    border-color: #c88413;
}
.region-WL .cell.locked {
  background-color: #20b2aa;
  border-color: #1e8e88;
  background:
    repeating-linear-gradient(
      45deg,
      #20b2aa,
      #20b2aa 2px,
      #3fc2bc 2px,
      #3fc2bc 4px
    );
}
.region-WL .cell.locked::after {
     background-image:
    linear-gradient(45deg, transparent 44%, #1e8e88 45%, #1e8e88 55%, transparent 56%),
    linear-gradient(-45deg, transparent 44%, #1e8e88 45%, #1e8e88 55%, transparent 56%);
}
.region-WL .cell.relocked {
    background-color: #f5a623;
    border-color: #c88413;
    background:
    repeating-linear-gradient(
      45deg,
      #f5a623,
      #f5a623 2px,
      #f7b94a 2px,
      #f7b94a 4px
    );
}
.region-WL .cell.relocked::after {
    background-image:
    linear-gradient(45deg, transparent 44%, #c88413 45%, #c88413 55%, transparent 56%),
    linear-gradient(-45deg, transparent 44%, #c88413 45%, #c88413 55%, transparent 56%);
}
.region-WL .row-inputs-type2, .region-WL .col-inputs-type2 {
    display: grid;
    gap: 3px;
    background-color: #fdf1e3;
    border-radius: 4px;
}
.region-WL .row-inputs-type2 input, .region-WL .col-inputs-type2 input {
    border: 1.5px solid #f5c578;
    background-color: #f5f9ff;
    width: 32px;
    text-align: center;
    border-radius: 8px;
    font-weight: 600;
    user-select: text;
    padding: 4px 6px;
    transition: border-color 0.3s ease;
}
.region-WL .button-mode-input.type1 {
  background-color: #20b2aa;
  border: 2px solid #1e8e88;
  box-shadow: 0 2px 6px rgba(32, 178, 170, 0.3);
  color: white;
}
.region-WL .button-mode-input.type1:hover {
  background-color: #35c5b8;
  box-shadow: 0 3px 8px rgba(32, 178, 170, 0.4);
}
.region-WL .button-mode-input.type2 {
  background-color: #f5a623;
  border: 2px solid #c88413;
  box-shadow: 0 2px 6px rgba(245, 166, 35, 0.3);
  color: white;
}
.region-WL .button-mode-input.type2:hover {
  background-color: #f7b94a;
  box-shadow: 0 3px 8px rgba(245, 166, 35, 0.4);
}
.region-WL .comp-count-input.type2 {
    background-color: #fdf1e3;
    border-color: #f5c578;
}

.preset-region-header {
    padding: 12px 16px;
    background: #f0f0f0;
    border-bottom: 1px solid #e0e0e0;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: #2c3e50;
    user-select: none;
    transition: background-color 0.2s ease;
}

.preset-region-header:hover {
    background-color: #e8e8e8;
}

.preset-region-header .toggle-icon {
    display: inline-block;
    width: 16px;
    text-align: center;
    transition: transform 0.2s ease;
    font-size: 0.9rem;
}

.preset-tab-header {
    padding: 10px 16px 10px 32px;
    background: #fafafa;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: #34495e;
    user-select: none;
    transition: background-color 0.2s ease;
}

.preset-tab-header:hover {
    background-color: #f5f5f5;
}

.preset-tab-header .toggle-icon {
    display: inline-block;
    width: 16px;
    text-align: center;
    margin-left: 4px;
    transition: transform 0.2s ease;
    font-size: 0.85rem;
}

.preset-item {
    padding: 12px 16px 12px 48px;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    background: white;
    transition: background-color 0.2s ease;
    font-weight: 400;
    color: #2c3e50;
    user-select: none;
    font-size: 0.95rem;
}

.preset-item:hover {
    background-color: #f5f5f5;
}

.preset-item.selected {
    background-color: #bbdefb;
    font-weight: 600;
}

.preset-item.selected:hover {
    background-color: #bbdefb;
}


@media (max-width: 720px) {
    #tool-container {
        flex-direction: column;
        width: 100%;
        max-width: none;
        align-items: center;
        justify-content: flex-start;
    }
    #author-info {
        position: unset !important;
    }
}

/* Modal overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.45);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

/* Custom component panel */
.custom-comp-panel {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 16px 48px rgba(0,0,0,0.2);
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.35s ease;
    min-width: 320px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    border-bottom: 1.5px solid #eee;
    padding-bottom: 12px;
}

.panel-header h3 {
    margin: 0;
    font-size: 1.3rem;
    color: #2c3e50;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: #999;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s, color 0.2s;
}

.close-btn:hover {
    background-color: #f0f0f0;
    color: #333;
}

.dimension-inputs {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
    justify-content: center;
}

.dimension-inputs label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    color: #34495e;
}

.dimension-inputs input {
    width: 60px;
    padding: 6px 10px;
    border: 1.8px solid #ccc;
    border-radius: 8px;
    text-align: center;
    font-size: 1rem;
}

.custom-grid-wrapper {
    display: flex;
    justify-content: center;
    margin-top: 12px;
}

.custom-grid {
    display: grid;
    gap: 3px;
    background: #fafafa;
    padding: 12px;
    border-radius: 12px;
    box-shadow: inset 0 0 5px #ddd;
}

.custom-grid-cell {
    width: 40px;
    height: 40px;
    border: 1.5px solid #ccc;
    border-radius: 8px;
    background-color: white;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, transform 0.1s;
}

.custom-grid-cell:hover {
    border-color: #409eff;
    transform: scale(1.05);
}

.custom-grid-cell.lit {
    background-color: #409eff;
    border-color: #2c7bd4;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Expanded panel for desktop */
.expanded-panel {
    background: white;
    border-radius: 16px;
    width: 90vw;
    height: 90vh;
    box-shadow: 0 20px 60px rgba(0,0,0,0.25);
    display: flex;
    flex-direction: column;
    position: relative;
    animation: slideUp 0.35s ease;
    overflow: hidden;
}

.expanded-panel-header {
    padding: 16px 24px;
    border-bottom: 1.5px solid #eee;
    flex-shrink: 0;
}

.header-row {
    display: flex;
    gap: 24px;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.header-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.expanded-panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 20px 24px;
}

.expanded-components-table {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 20px;
}

.expanded-comp-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    border-radius: 12px;
    background: #f9fafb;
    border: 1.5px solid #eee;
    transition: box-shadow 0.2s;
    height: 210px;
    justify-content: space-between;
}

.expanded-comp-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.comp-preview-wrapper {
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 6px rgba(0,0,0,0.1);
    flex-shrink: 0;
}

.comp-name {
    font-size: 0.85rem;
    color: #666;
    margin-top: 4px;
    text-align: center;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    width: 100%;
}

.comp-inputs {
    display: flex;
    gap: 6px;
    margin-top: 6px;
    justify-content: center;
    width: 100%;
}

.expanded-panel-footer {
    padding: 12px 24px;
    border-top: 1.5px solid #eee;
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-shrink: 0;
}