/* --- Global & Base Styles --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Define color variables for easier theming */
    --bg-color: #f8f9fa; /* Lighter background */
    --container-bg: #ffffff;
    --workspace-bg-start: #eef2f7;
    --workspace-bg-end: #dde4ed;
    --element-bg: #e9ecef;
    --element-bg-hover: #dee2e6;
    --element-bg-active: #ced4da;
    --text-color: #212529; /* Darker text */
    --text-muted: #6c757d; /* Muted text */
    --border-color: #dee2e6;
    --border-color-light: #f1f3f5;
    --accent-color: #4a90e2; /* A nice blue */
    --accent-color-dark: #3a7bc8;
    --danger-color: #e74c3c;
    --danger-color-dark: #c0392b;
    --success-color: #2ecc71;
    --success-color-dark: #27ae60;
    --shadow-color-light: rgba(0, 0, 0, 0.05);
    --shadow-color-medium: rgba(0, 0, 0, 0.1);

    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px; /* For pill shape */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-size: 16px; /* Base font size */
}

h1 {
    text-align: center;
    margin: 20px 0;
    color: var(--accent-color);
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* --- Main Layout --- */
.container {
    display: flex;
    flex-grow: 1;
    padding: 20px;
    gap: 20px; /* Slightly more space */
    max-width: 1500px; /* Slightly wider max */
    margin: 0 auto;
    width: 100%;
}

/* --- Palette Area --- */
#palette-container {
    display: flex;
    flex-direction: column;
    flex-basis: 320px; /* Slightly wider */
    flex-shrink: 0;
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
    box-shadow: 0 4px 12px var(--shadow-color-light);
    height: calc(100vh - 140px); /* Adjust height based on h1/footer/padding */
    max-height: 85vh;
    transition: box-shadow 0.3s ease;
}
#palette-container:hover {
    box-shadow: 0 6px 16px var(--shadow-color-medium);
}


#palette-container h2 {
    text-align: center;
    margin-bottom: 15px;
    font-size: 1.25em; /* Slightly larger */
    color: var(--text-color);
    font-weight: 500;
}

#search-bar {
    width: 100%;
    padding: 10px 12px; /* More padding */
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.95em;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
#search-bar:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2); /* Focus ring */
}

#palette {
    flex-grow: 1;
    overflow-y: auto;
    padding: 10px 5px; /* Padding inside */
    margin-bottom: 15px;
    background-color: var(--bg-color); /* Match body background for inset look */
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius-sm);
    /* Custom Scrollbar (Webkit) */
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: var(--border-color) var(--bg-color); /* Firefox */
}
#palette::-webkit-scrollbar {
    width: 8px;
}
#palette::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}
#palette::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
    border: 2px solid var(--bg-color); /* Creates padding around thumb */
}
#palette::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}


.info-area {
    padding: 12px 5px 5px 5px;
    text-align: center;
    font-size: 0.9em;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color-light);
    flex-shrink: 0;
}

#element-count {
    font-weight: 600;
    color: var(--text-color);
}

#reset-button {
    margin-left: 15px;
    padding: 6px 12px; /* More balanced padding */
    font-size: 0.85em;
    font-weight: 500;
    cursor: pointer;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    transition: background-color 0.2s ease, transform 0.1s ease;
}
#reset-button:hover {
    background-color: var(--danger-color-dark);
}
#reset-button:active {
    transform: scale(0.98); /* Click effect */
}

/* --- Workspace Area --- */
#workspace {
    flex-grow: 1;
    background-image: linear-gradient(to bottom right, var(--workspace-bg-start), var(--workspace-bg-end));
    border: 1px solid var(--border-color); /* Subtle border */
    border-radius: var(--border-radius-md);
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.06); /* Subtle inset shadow */
    min-height: 400px;
    height: calc(100vh - 140px); /* Match palette container height */
    max-height: 85vh;
}

.workspace-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-muted);
    font-size: 1.1em;
    font-style: normal; /* Less jarring than italic */
    text-align: center;
    pointer-events: none;
    user-select: none;
}

/* --- Element Styling (Shared & Specific) --- */
.element {
    display: inline-flex; /* Use flex for better alignment */
    align-items: center; /* Vertically align emoji and text */
    background-color: var(--element-bg);
    border: 1px solid transparent; /* Start with transparent border */
    padding: 5px 12px; /* Adjusted padding */
    margin: 5px;
    border-radius: var(--border-radius-lg); /* Pill shape */
    cursor: grab;
    font-size: 0.9em;
    font-weight: 500; /* Slightly bolder text */
    color: var(--text-color);
    user-select: none;
    white-space: nowrap;
    box-shadow: 0 1px 3px var(--shadow-color-light);
    transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease-out;
}
.element span { /* Style emoji specifically if needed */
    margin-right: 5px;
    font-size: 1.1em; /* Make emoji slightly larger */
}

.element:hover {
    border-color: var(--element-bg-active);
    background-color: var(--element-bg-hover);
    box-shadow: 0 2px 5px var(--shadow-color-medium);
    transform: translateY(-1px); /* Slight lift on hover */
}

.element:active {
    cursor: grabbing;
    background-color: var(--element-bg-active);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.1); /* Inset shadow when pressed */
    transform: scale(0.98); /* Press down effect */
}

/* Workspace elements get position:absolute from JS */
#workspace .element {
    position: absolute;
    z-index: 10;
    background-color: var(--container-bg); /* White background for workspace elements */
    box-shadow: 0 3px 8px var(--shadow-color-medium); /* More prominent shadow */
}
#workspace .element:hover {
     box-shadow: 0 5px 12px var(--shadow-color-medium);
     transform: translateY(-1px) scale(1.02); /* Lift and slightly enlarge */
}


/* --- Dragging State --- */
.element.dragging {
    opacity: 0.85; /* Less transparent */
    transform: scale(1.08); /* Slightly larger when dragging */
    box-shadow: 0 6px 15px var(--shadow-color-medium); /* Lifted shadow */
    cursor: grabbing;
    z-index: 100;
    border-color: var(--accent-color); /* Highlight border */
    background-color: var(--container-bg); /* Keep background bright */
}

/* --- Tooltip Indication --- */
.element[title] {
    cursor: help;
}

/* --- Message Area Styling --- */
#message-area {
    position: fixed;
    bottom: 25px; /* Raise slightly */
    left: 50%;
    transform: translate(-50%, 10px); /* Start slightly lower for slide-up */
    padding: 12px 25px;
    background-color: rgba(33, 37, 41, 0.9); /* Darker, less transparent */
    color: white;
    border-radius: var(--border-radius-md); /* Consistent radius */
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s linear 0.3s, background-color 0.3s ease;
    text-align: center;
    min-width: 240px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    font-size: 0.95em;
    font-weight: 500;
}

#message-area.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%); /* Slide up to final position */
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
}

#message-area.error {
    background-color: rgba(231, 76, 60, 0.95); /* Danger color, slightly more opaque */
}

#message-area.discovery {
    background-color: rgba(46, 204, 113, 0.95); /* Success color, slightly more opaque */
    font-weight: 600; /* Bolder for discovery */
}
#message-area.discovery::before {
     content: "🎉 "; /* Add a party popper */
}
#message-area.error::before {
    content: "⚠️ "; /* Warning sign */
}


/* --- Shake Animation --- */
.element.shake {
    animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both; /* Smoother shake */
}

@keyframes shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}

/* --- Footer --- */
footer#attribution {
    text-align: center;
    margin-top: auto; /* Push footer to bottom if content is short */
    padding: 15px;
    font-size: 0.85em;
    color: var(--text-muted);
    width: 100%;
    background-color: var(--bg-color); /* Match body background */
    border-top: 1px solid var(--border-color-light);
}