/* Color Themes */
.theme-default {
    --primary: #333333;
    --secondary: #666666;
    --bg-color: #f5f5f5;
    --accent-color: #007bff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --card-shadow: rgba(0, 0, 0, 0.06);
    --card-border: #e0e0e0;
    --input-bg: #ffffff;
    --input-text: #333333;
    --card-background: #ffffff;
    --blue-accent: #007bff;
    --blue-light: rgba(0, 123, 255, 0.1);
}

.theme-dark {
    --primary: #f5f5f5;
    --secondary: #cccccc;
    --bg-color: #121212;
    --accent-color: #007bff;
    --text-primary: #f5f5f5;
    --text-secondary: #b3b3b3;
    --card-shadow: rgba(0, 0, 0, 0.2);
    --card-border: #333333;
    --input-bg: #1e1e1e;
    --input-text: #f5f5f5;
    --card-background: #1e1e1e;
    --blue-accent: #007bff;
    --blue-light: rgba(0, 123, 255, 0.15);
}

:root {
    /* Common variables */
    --border-radius: 6px;
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    --transition-speed: 0.2s;
}

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

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%; 
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    box-sizing: border-box;
}

main {
    flex: 1;
    width: 100%;
    margin: 0 auto;
}

/* Remove decorative elements */
body::before,
.converter-card::before {
    display: none;
}

h1::before, h1::after {
    display: none;
}

/* Header styling */
header {
    width: 100%;
    text-align: center;
    margin-bottom: 2rem;
}

.header-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    font-family: inherit;
}

/* Main layout */
.conversion-layout {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    gap: 1.5rem;
    width: 100%;
    margin-bottom: 2rem;
}

/* Side Panels */
.conversion-list {
    width: 300px;
    background-color: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    box-shadow: var(--box-shadow);
    height: auto;
    max-height: 700px;
    overflow-y: auto;
    scroll-behavior: smooth;
    /* Scrollbar styling */
    scrollbar-width: thin;
    scrollbar-color: var(--card-border) transparent;
}

/* Webkit scrollbar styling */
.conversion-list::-webkit-scrollbar {
    width: 6px;
}

.conversion-list::-webkit-scrollbar-track {
    background: transparent;
}

.conversion-list::-webkit-scrollbar-thumb {
    background-color: var(--card-border);
    border-radius: 6px;
}

.conversion-list h3 {
    margin: 0;
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
    font-size: 1.1rem;
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
    font-family: inherit;
}

/* Category styling in lists */
.category-group {
    margin: 1rem 0;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    border-radius: 0;
    background-color: transparent;
    border: none;
}

.category-group strong {
    font-weight: 600;
    display: block;
    margin-bottom: 0.75rem;
    color: var(--accent-color);
    font-size: 0.95rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px dashed var(--card-border);
}

.conversion-items {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-left: 0.25rem;
    margin-bottom: 1rem;
}

.conversion-item {
    display: flex;
    align-items: center;
    white-space: nowrap;
    padding: 0.15rem 0.3rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
    cursor: pointer;
    border-radius: 3px;
    font-size: 0.85rem;
    gap: 0.5rem;
    position: relative;
}

.conversion-item:hover {
    color: var(--accent-color);
    background-color: var(--blue-light);
    transform: translateX(3px);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.dark-theme .conversion-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.conversion-item.active {
    background-color: var(--blue-light);
    color: var(--accent-color);
    font-weight: 500;
}

.conversion-item.active::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 0;
    height: 100%;
    width: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.conversion-item:active {
    transform: translateX(1px);
    opacity: 0.9;
}

/* Style for the "to" word replacing arrows */
.conversion-item .to-word {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

.conversion-item:hover .to-word {
    color: var(--accent-color);
}

/* Center card */
.converter-card {
    flex: 1;
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--card-border);
    min-width: 500px;
}

/* Input and Select Styling */
.search-box,
.input-style,
.select-style {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-family: inherit;
    color: var(--input-text);
    background-color: var(--input-bg);
    transition: all var(--transition-speed);
    height: 42px;
}

.search-box:focus,
.input-style:focus,
.select-style:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--blue-light);
}

.select-style {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23666666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
    padding-right: 2.5rem;
}

.theme-dark .select-style {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

/* Input container */
.search-container {
    position: relative;
    margin-bottom: 1.25rem;
}

/* Swap button */
.swap-button {
    background-color: var(--card-background);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    margin: 0 0.5rem;
    flex-shrink: 0;
}

.swap-button:hover {
    background-color: var(--blue-light);
    color: var(--blue-accent);
    border-color: var(--blue-accent);
}

/* Conversion layout */
.conversion-group {
    display: flex;
    align-items: center;
    margin-top: 1rem;
    gap: 0.75rem;
}

.input-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Length category styling - make it blue to match screenshot */
.category-group strong {
    color: var(--accent-color);
}

/* Additional responsive adjustments */
@media (max-width: 1200px) {
    .conversion-layout {
        flex-direction: column;
    }
    
    .conversion-list {
        width: 100%;
        max-height: 400px;
        order: 1;
        margin-bottom: 1rem;
    }
    
    .converter-card {
        width: 100%;
        min-width: unset;
        order: 0;
        margin-bottom: 1.5rem;
    }
}

@media (max-width: 800px) {
    .conversion-group {
        flex-direction: column;
    }
    
    .swap-button {
        margin: 0.5rem 0;
        transform: rotate(90deg);
    }
}

@media (max-width: 600px) {
    .container {
        padding: 1rem 0.75rem;
    }
    
    .converter-card {
        padding: 1.25rem 1rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
}

/* Support unit section */
.intro-section {
    width: 100%;
    max-width: 800px;
    margin: 1rem auto 2rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    border: 1px solid var(--card-border);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.intro-toggle {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--card-background);
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.intro-toggle:hover {
    color: var(--accent-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 1.5rem 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Improved styles for the unit symbols on the left panel */
.symbol-list .conversion-item {
    font-family: monospace;
    letter-spacing: 0.03em;
}

/* Loading message style */
.loading-message {
    padding: 1rem;
    color: var(--text-secondary);
    text-align: center;
    font-style: italic;
}

/* Styling for the "to" word in conversion items */
.to-word {
    color: var(--text-secondary);
    font-style: italic;
    font-weight: 400;
    font-size: 0.9em;
    margin: 0 0.3rem;
    opacity: 0.8;
}

/* Search Results Styling */
.search-results {
    position: absolute;
    width: 100%;
    max-height: 300px;
    overflow-y: auto;
    background-color: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-top: 5px;
    z-index: 10;
    display: none;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.2s, transform 0.2s;
}

.search-results.show {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.search-result-item {
    padding: 0.75rem 1rem;
    cursor: pointer;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background-color: var(--blue-light);
    color: var(--blue-accent);
}

.unit-category {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.8;
}