:root {
    --background: #f0f0f0;
    --foreground: #e0e0e0;
    --text: #333;
    --header: #666;
    --panel-bg: #ffffff;
    --button-bg: #4285f4;
    --button-hover: #3b78e7;
    --button-text: #ffffff;
    --pane-width: 400px;
}

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

body {
    margin: 0;
    overflow: hidden;
    touch-action: none;
    font-family: "Quicksand", sans-serif;
    background-color: var(--background);
    color: var(--text);
}

/* App container - flexbox layout for canvas and pane */
.app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
}

#canvas-3d {
    flex: 1;
    min-width: 0;
    touch-action: none;
    display: block;
    cursor: grab;
    background-color: #fafafa;
}

#canvas-3d:active {
    cursor: grabbing;
}

/* Radio tab bar — floating pill, matching clipboard input-panel style */
.radio-tab-bar {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px;
    background-color: var(--panel-bg);
    border-radius: 6px;
    box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 3;
    max-width: calc(100vw - 140px);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.radio-tab {
    padding: 6px 14px;
    border: none;
    border-radius: 4px;
    background: transparent;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    color: var(--header);
    cursor: pointer;
    transition: background-color 0.1s, color 0.1s;
    white-space: nowrap;
    -webkit-appearance: none;
    touch-action: manipulation;
}

.radio-tab:hover {
    background-color: var(--foreground);
    color: var(--text);
}

.radio-tab:active {
    transform: translateY(1px);
}

.radio-tab.active {
    background-color: var(--button-bg);
    color: var(--button-text);
}

.radio-tab-add {
    font-size: 18px;
    font-weight: 400;
    color: var(--header);
    padding: 6px 10px;
    line-height: 1;
}

.radio-tab-add:hover {
    color: var(--button-bg);
    background-color: var(--foreground);
}

.radio-tab-input {
    border: 1px solid var(--button-bg);
    border-radius: 3px;
    font-family: inherit;
    font-size: 13px;
    padding: 2px 6px;
    width: 80px;
    outline: none;
    background: var(--background);
    color: var(--text);
}

/* Right Pane - pushes canvas */
.right-pane {
    display: none;
    width: var(--pane-width);
    height: 100vh;
    background-color: var(--panel-bg);
    border-left: 1px solid var(--foreground);
    box-shadow: -4px 0 8px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    flex-shrink: 0;
}

.right-pane.visible {
    display: block;
}

/* Pane content sections */
.pane-content {
    display: none;
    padding: 15px;
    flex-direction: column;
    gap: 15px;
    min-width: var(--pane-width);
}

.pane-content.visible {
    display: flex;
}

.pane-content > h3 {
    margin: 0;
    font-size: 16px;
    color: var(--text);
    font-weight: 700;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--foreground);
}

/* Left Toolbar */
.tool-menu {
    position: fixed;
    top: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 3;
    padding-left: env(safe-area-inset-left);
    padding-bottom: env(safe-area-inset-bottom);
}

.button {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    border-width: thin;
    border-style: solid;
    border-color: var(--foreground);
    background-color: var(--panel-bg);
    cursor: pointer;
    font-size: 24px;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0px 4px 4px 4px rgba(0, 0, 0, 0.025);
    transition: background-color 0.1s;
    -webkit-appearance: none;
    touch-action: manipulation;
    padding: 0;
}

.button:hover {
    background-color: var(--foreground);
}

.button:active {
    transform: translateY(3px);
    box-shadow: 0px 4px 4px 4px rgba(0, 0, 0, 0.025);
}

.button.active {
    background-color: var(--foreground);
}

/* Dropdown button container */
.dropdown-button {
    position: relative;
}

/* Dropdown menu */
.dropdown-menu {
    display: none;
    position: absolute;
    left: calc(100% + 10px);
    top: 0;
    border-width: thin;
    border-style: solid;
    border-color: var(--foreground);
    background-color: var(--panel-bg);
    color: var(--text);
    width: 220px;
    max-width: calc(100vw - 100px + env(safe-area-inset-right));
    max-height: calc(100dvh - 50px - env(safe-area-inset-bottom));
    overflow-y: auto;
    box-shadow: 0px 4px 4px 4px rgba(0, 0, 0, 0.025);
    border-radius: 6px;
    padding: 6px;
    z-index: 10;
}

.dropdown-menu.visible {
    display: block;
}

.dropdown-menu h4 {
    margin: 5px 0;
    color: var(--header);
    font-weight: 700;
    font-size: 12px;
    padding: 0 5px;
}

.dropdown-menu label {
    display: block;
    padding: 6px;
    cursor: pointer;
    font-size: 14px;
}

.dropdown-menu label:hover {
    background-color: var(--foreground);
    border-radius: 6px;
}

.dropdown-menu input[type="radio"],
.dropdown-menu input[type="checkbox"] {
    margin-right: 8px;
}

.antenna-name-input {
    width: 100%;
    box-sizing: border-box;
    padding: 6px 8px;
    border: 1px solid var(--foreground);
    border-radius: 4px;
    background: var(--background);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    margin-bottom: 4px;
}

.dropdown-menu .slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px;
}

.dropdown-menu .slider-row label {
    padding: 0;
    flex-shrink: 0;
}

.dropdown-menu .slider-row input[type="range"] {
    flex: 1;
    min-width: 60px;
}

.dropdown-menu .slider-row span {
    min-width: 30px;
    font-size: 12px;
    color: var(--header);
    text-align: right;
}

/* Toolbar sections */
.toolbar-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.toolbar-section h4 {
    margin: 0;
    font-size: 12px;
    color: var(--header);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toolbar-section label {
    display: block;
    padding: 6px 8px;
    cursor: pointer;
    border-radius: 6px;
    font-size: 14px;
}

.toolbar-section label:hover {
    background-color: var(--foreground);
}

.toolbar-section input[type="radio"],
.toolbar-section input[type="checkbox"] {
    margin-right: 8px;
}

/* Pattern sections in Edit pane */
.pattern-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.pattern-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
}

.pattern-chart {
    display: flex;
    justify-content: center;
}

.pattern-chart canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
}

.pattern-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

.pattern-controls .paste-btn {
    flex: 1;
}

.rotate-controls {
    display: flex;
    gap: 4px;
}

.swap-controls {
    display: flex;
    gap: 4px;
}

.delete-btn {
    margin-left: auto;
    color: #999;
    font-size: 13px;
}

.delete-btn:hover {
    color: #ef4444;
    background-color: #fef2f2;
}

.toolbar-button {
    background-color: var(--panel-bg);
    border: none;
    border-radius: 6px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    transition: background-color 0.1s;
    box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.1);
}

.toolbar-button:hover {
    background-color: var(--foreground);
}

.toolbar-button:active {
    transform: translateY(2px);
}

.toolbar-button.blue {
    background-color: var(--button-bg);
    color: var(--button-text);
}

.toolbar-button.blue:hover {
    background-color: var(--button-hover);
}

/* Slider row */
.slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
}

.slider-row label {
    flex-shrink: 0;
    font-size: 14px;
    padding: 0;
}

.slider-row input[type="range"] {
    flex: 1;
    min-width: 60px;
}

.slider-row span {
    min-width: 35px;
    font-size: 12px;
    color: var(--header);
    text-align: right;
}

/* Color indicators */
.color-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 2px;
    flex-shrink: 0;
    vertical-align: middle;
    margin-right: 4px;
}

.color-indicator.azimuth {
    background: #4080e0;
}

.color-indicator.elevation-xz {
    background: #40b040;
}

.color-indicator.elevation-yz {
    background: #e04040;
}

/* Drop overlay for file import */
.drop-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 100;
    align-items: center;
    justify-content: center;
}

.drop-overlay.visible {
    display: flex;
}

.drop-overlay-message {
    background: var(--panel-bg);
    border: 2px dashed var(--button-bg);
    border-radius: 12px;
    padding: 40px 60px;
    font-size: 18px;
    color: var(--text);
    pointer-events: none;
}

/* Responsive */
@media (max-width: 600px) {
    .tool-menu {
        top: 10px;
        left: 10px;
    }

    :root {
        --pane-width: calc(100vw - 70px);
    }
}