:root {
    --primary-color: #4361ee;
    --primary-light: #e0e7ff;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --warning-color: #f8961e;
    --info-color: #7209b7;
    
    --text-primary: #2b2d42;
    --text-secondary: #8d99ae;
    --text-light: #edf2f4;
    
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e9ecef;
    --shadow-color: rgba(0, 0, 0, 0.08);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #4895ef;
    --primary-light: #1a365d;
    --secondary-color: #4361ee;
    --accent-color: #3f37c9;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --warning-color: #f8961e;
    --info-color: #7209b7;
    
    --text-primary: #edf2f4;
    --text-secondary: #8d99ae;
    --text-light: #2b2d42;
    
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --border-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Hind Siliguri', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.app-header {
    margin-bottom: 30px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 28px;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 22px;
    font-weight: 600;
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 10px;
}

/* Main Content Styles */
.app-content {
    flex: 1;
    margin-bottom: 30px;
}

.converter-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.section-header h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
}

/* Input & Output Sections */
.input-section, .output-section {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: 0 4px 12px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.text-input-container, .text-output-container {
    position: relative;
    margin-bottom: 15px;
}

textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: 'Hind Siliguri', sans-serif;
    resize: vertical;
    min-height: 200px;
    background-color: var(--card-bg);
    color: var(--text-primary);
    transition: var(--transition);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.char-counter {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
}

.output-box {
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    min-height: 200px;
    background-color: var(--card-bg);
    white-space: pre-wrap;
    overflow-y: auto;
    max-height: 300px;
    transition: var(--transition);
}

.placeholder-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
}

.placeholder-text i {
    font-size: 40px;
    margin-bottom: 10px;
    opacity: 0.5;
}

.placeholder-text p {
    font-size: 14px;
}

.output-box.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--warning-color);
    font-style: italic;
}

.output-box.error {
    color: var(--danger-color);
}

/* File Upload Styles */
.file-upload {
    display: flex;
    align-items: center;
    gap: 8px;
}

.file-input-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-light);
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
}

.file-input-btn:hover {
    background-color: var(--primary-color);
    color: white;
}

.file-input-btn i {
    font-size: 16px;
}

#fileInput {
    display: none;
}

.file-name {
    font-size: 13px;
    color: var(--text-secondary);
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Progress Bar Styles */
.progress-container {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    margin: 15px 0;
    position: relative;
    display: none;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 3px;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    position: absolute;
    right: 0;
    top: -20px;
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 500;
}

/* Controls Styles */
.controls {
    margin-top: 20px;
}

.direction-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: 'Hind Siliguri', sans-serif;
    background-color: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

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

/* Button Styles */
.btn {
    padding: 10px 15px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: 'Hind Siliguri', sans-serif;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.btn i {
    font-size: 14px;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    flex: 2;
}

.primary-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-1px);
}

.secondary-btn {
    background-color: var(--primary-light);
    color: var(--primary-color);
    flex: 1;
}

.secondary-btn:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
}

.tertiary-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 8px 12px;
}

.tertiary-btn:hover {
    background-color: var(--primary-light);
}

.danger-btn {
    background-color: var(--danger-color);
    color: white;
    flex: 1;
}

.danger-btn:hover {
    background-color: #d1145a;
    transform: translateY(-1px);
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:hover {
    background-color: var(--border-color);
}

.close-btn:hover {
    background-color: var(--danger-color);
    color: white;
}

/* Tooltip Styles */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip i {
    color: var(--text-secondary);
    cursor: help;
}

.tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--card-bg);
    color: var(--text-primary);
    text-align: center;
    border-radius: var(--radius-sm);
    padding: 8px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    font-size: 13px;
    font-weight: 400;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* History Panel Styles */
.history-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background-color: var(--card-bg);
    box-shadow: -2px 0 10px var(--shadow-color);
    transition: right 0.3s ease;
    z-index: 100;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border-color);
}

.history-panel.active {
    right: 0;
}

.history-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-header h3 {
    font-size: 18px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
}

.no-history {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

.history-item {
    padding: 12px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.history-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px var(--shadow-color);
}

.history-item-title {
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--primary-color);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.history-item-title i {
    font-size: 12px;
}

.history-item-content {
    font-size: 13px;
    color: var(--text-primary);
    margin-bottom: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item-content-output {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item-meta {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 8px;
}

.history-footer {
    padding: 15px;
    border-top: 1px solid var(--border-color);
}

/* Footer Styles */
.app-footer {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
}

.app-footer .highlight {
    color: var(--primary-color);
    font-weight: 500;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 1.5s infinite;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .converter-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .logo h1 {
        font-size: 18px;
    }
    
    .history-panel {
        width: 100%;
        right: -100%;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .file-upload {
        width: 100%;
    }
    
    .file-name {
        max-width: 100%;
    }
}