/* Calculator Button Styles */
.calculator-btn {
    transition: all 0.2s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.calculator-btn:active {
    transform: translateY(2px) scale(0.95);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Mode Button Styles */
.mode-btn.active {
    background-color: #3b82f6;
    color: white;
}

/* Display Area */
.display {
    min-height: 80px;
}

/* History Item Hover Effect */
.history-item:hover {
    background-color: #f3f4f6;
    cursor: pointer;
}

/* Conversion Select Dropdown */
.conversion-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7' /%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1.5em 1.5em;
}

/* Advertisement Banner */
.ad-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: 2px solid #f8fafc;
}

/* History Sidebar */
.history-sidebar {
    background: linear-gradient(to bottom, #f8fafc 0%, #e2e8f0 100%);
    border: 2px solid #3b82f6;
}

/* Logo Section */
.logo-section {
    background: linear-gradient(45deg, #3b82f6 0%, #1d4ed8 100%);
    border: 2px solid #f8fafc;
}

/* SEO Footer */
.seo-footer {
    background: linear-gradient(to right, #f1f5f9 0%, #e2e8f0 100%);
    border: 2px solid #3b82f6;
}

/* Scientific Calculator Styles */
.scientific-expression {
    font-family: 'Courier New', monospace;
    min-height: 1.5rem;
    overflow-x: auto;
    white-space: nowrap;
}

.scientific-expression::-webkit-scrollbar {
    display: none;
}

.scientific-expression {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* Parentheses highlighting */
.parenthesis-open {
    color: #4ade80;
    font-weight: bold;
}

.parenthesis-close {
    color: #f87171;
    font-weight: bold;
}

/* Scientific button active states */
.scientific-mode-active {
    background-color: #3b82f6 !important;
    color: white !important;
}

/* Calculator key animation */
.calculator-btn:active {
    transform: translateY(2px) scale(0.95);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}