/* --- Art Deco Color Palette --- */
:root {
    --color-primary: #9E7D63; /* Rustic Brown */
    --color-secondary: #D4AF37; /* Gold/Bronze Accent */
    --color-background: #F0E6D8; /* Cream/Pale Beige */
    --color-panel: #FFFFFF;
    --color-text: #333333;
    --color-shadow: rgba(0, 0, 0, 0.15);
}

/* --- Global Reset & Art Deco Basics --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Georgia', serif;
    background-color: var(--color-background);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 40px 20px;
    color: var(--color-text);
}

.main-container {
    background: var(--color-panel);
    padding: 40px;
    border: 5px solid var(--color-primary);
    border-radius: 5px;
    box-shadow: 0 10px 25px var(--color-shadow);
    width: 100%;
    max-width: 950px;
}

h1 {
    text-align: center;
    color: var(--color-primary);
    font-size: 2.5rem;
    margin-bottom: 35px;
    border-bottom: 3px solid var(--color-secondary);
    padding-bottom: 15px;
    letter-spacing: 2px;
}

/* --- Input Panel Styling --- */
.input-panel {
    background: #F8F8F8;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 20px;
    margin-bottom: 30px;
}

.mode-panel {
    border-color: var(--color-secondary); /* Highlight the Mode panel */
}

.mode-options {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed #ccc;
}

.mode-options .input-row {
    margin-bottom: 0;
}

.input-row {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.input-row label {
    flex: 0 0 160px; /* Increased width for labels to fit "Conversion Mode" */
    font-weight: bold;
    color: var(--color-primary);
}

.base-select,
#inputValue,
#bitWidthSelect {
    flex-grow: 1;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 3px;
    font-size: 1rem;
}

/* --- Results Grid --- */
.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.result-box {
    background: #FFFFFF;
    border: 2px solid var(--color-secondary);
    border-radius: 5px;
    padding: 20px;
    box-shadow: 0 4px 10px var(--color-shadow);
    transition: transform 0.1s ease-out, box-shadow 0.1s ease-out;
}

/* Animation on Click (for visual feedback) */
.result-box:active {
    transform: translateY(2px);
    box-shadow: 0 2px 5px var(--color-shadow);
}

.result-box label {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
    color: var(--color-text);
}

.output-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
}

.output-value {
    flex-grow: 1;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: var(--color-primary);
    word-break: break-all;
    padding-right: 10px;
}

.action-group {
    display: flex;
    gap: 10px;
}

.copy-btn,
.expand-btn {
    padding: 8px 12px;
    border: 1px solid var(--color-secondary);
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
    font-family: inherit;
}

.copy-btn {
    background-color: var(--color-secondary);
    color: white;
}

.copy-btn:hover {
    background-color: #B8962A;
}

.expand-btn {
    background-color: #FFFFFF;
    color: var(--color-primary);
}

.expand-btn:hover {
    background-color: #F0F0F0;
}

/* --- Explanation Panel Styling --- */
.explanation-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-in-out, padding 0.5s ease-in-out;
    background: #FAFAFA;
    border-top: 1px dashed #ddd;
    margin-top: 15px;
    padding: 0 10px;
}

.explanation-panel.expanded {
    max-height: 1000px; /* Increased for complex explanations */
    padding: 15px 10px 10px 10px;
}

.explanation-text {
    white-space: pre-wrap;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    color: #555;
}

/* --- Notification Popup --- */
.notification-popup {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--color-secondary);
    color: white;
    padding: 12px 25px;
    border-radius: 5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.4s ease-out, opacity 0.4s ease-out;
    z-index: 1000;
}

.notification-popup.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* --- Responsive Layout (Mobile) --- */
@media (max-width: 768px) {
    .main-container {
        padding: 20px;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .input-row {
        flex-direction: column;
        align-items: stretch;
    }

    .input-row label {
        flex: auto;
        margin-bottom: 5px;
    }

    .output-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .output-value {
        padding-right: 0;
        border-bottom: 1px dotted #ddd;
        width: 100%;
    }

    .action-group {
        width: 100%;
        justify-content: space-around;
    }
}