/* ============================================
   BASE64 ENCODER/DECODER - TOOL-SPECIFIC STYLES
   Common styles loaded from /shared/styles/common.css
   ============================================ */

/* ============================================
   MODE TABS
   ============================================ */

.mode-tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
    border-bottom: 2px solid var(--border-color);
}

.mode-tab {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    margin-bottom: -2px;
}

.mode-tab:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.mode-tab.active {
    color: var(--color-primary-500);
    border-bottom-color: var(--color-primary-500);
}

.tab-icon {
    font-size: 1.25rem;
}

/* ============================================
   INPUT TYPE SELECTOR
   ============================================ */

.input-type-selector {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background: var(--bg-card);
    border-radius: var(--radius-base);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-base);
    cursor: pointer;
    transition: all var(--transition-base);
}

.radio-label:hover {
    border-color: var(--color-primary-500);
}

.radio-label input[type="radio"] {
    margin: 0;
}

.radio-label input[type="radio"]:checked + span {
    color: var(--color-primary-500);
    font-weight: 600;
}

.radio-label:has(input[type="radio"]:checked) {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--color-primary-500);
}

/* ============================================
   INPUT SECTIONS
   ============================================ */

.input-section {
    margin-bottom: var(--space-4);
}

.section-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.text-area {
    width: 100%;
    padding: var(--space-3);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-base);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.5;
    resize: vertical;
    transition: all var(--transition-base);
}

.text-area:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.text-area::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

.output-area {
    background: var(--bg-secondary);
}

.char-count {
    margin-top: var(--space-2);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ============================================
   FILE UPLOAD AREA
   ============================================ */

.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-8);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.file-upload-area:hover {
    border-color: var(--color-primary-500);
    background: rgba(59, 130, 246, 0.05);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.upload-icon {
    font-size: 3rem;
}

.upload-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--bg-card);
    border-radius: var(--radius-base);
}

.file-icon {
    font-size: 2rem;
}

.file-details {
    flex: 1;
    text-align: left;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.remove-file-btn {
    width: 32px;
    height: 32px;
    background: var(--color-error);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-file-btn:hover {
    transform: scale(1.1);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-base);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary-500);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-large {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
    margin-bottom: var(--space-6);
}

.btn-small {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
}

.btn-icon {
    font-size: 1.125rem;
}

/* ============================================
   OUTPUT SECTION
   ============================================ */

.output-section {
    margin-top: var(--space-6);
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.output-actions {
    display: flex;
    gap: var(--space-2);
}

/* ============================================
   FEATURE LIST & USAGE STEPS
   ============================================ */

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: var(--space-2) 0;
    color: var(--text-secondary);
}

.usage-steps {
    padding-left: var(--space-6);
}

.usage-steps li {
    padding: var(--space-2) 0;
    color: var(--text-secondary);
}

.usage-steps strong {
    color: var(--text-primary);
}

.tool-usage h3 {
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .mode-tab {
        padding: var(--space-2) var(--space-3);
        font-size: 0.875rem;
    }
    
    .tab-text {
        display: none;
    }
    
    .tab-icon {
        font-size: 1.5rem;
    }
    
    .input-type-selector {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .radio-label {
        justify-content: center;
    }
    
    .file-upload-area {
        padding: var(--space-6);
    }
    
    .upload-icon {
        font-size: 2rem;
    }
    
    .btn-large {
        padding: var(--space-3) var(--space-4);
    }
    
    .output-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .output-actions {
        width: 100%;
    }
    
    .output-actions .btn {
        flex: 1;
    }
    
    .btn-text {
        display: none;
    }
    
    .btn-icon {
        font-size: 1.25rem;
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

.output-section {
    animation: fadeIn 0.3s ease;
}