/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c5aa0;
    --primary-light: #4a7bc7;
    --primary-dark: #1e3a6f;
    --secondary-color: #5cb85c;
    --warning-color: #f0ad4e;
    --danger-color: #d9534f;
    --info-color: #5bc0de;
    
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f8f9fa;
    --white: #ffffff;
    
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--box-shadow);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 2rem;
    color: var(--white);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: #6c757d;
    color: var(--white);
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Section Styles */
.checker-section, .interactions-section, .resources-section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* Checker Interface */
.checker-interface {
    background-color: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    max-width: 800px;
    margin: 0 auto;
}

.drug-input-container {
    position: relative;
    margin-bottom: 2rem;
}

.search-box {
    position: relative;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.drug-search {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.drug-search:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 90, 160, 0.1);
}

.suggestions-container {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    z-index: 10;
    max-height: 200px;
    overflow-y: auto;
    display: none;
}

.suggestion-item {
    padding: 0.75rem 1rem;
    cursor: pointer;
    border-bottom: 1px solid #e9ecef;
    transition: var(--transition);
}

.suggestion-item:hover {
    background-color: #f8f9fa;
}

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

.selected-drugs {
    margin-bottom: 2rem;
}

.selected-drugs h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.selected-drugs-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    min-height: 60px;
    padding: 1rem;
    border: 2px dashed #e9ecef;
    border-radius: var(--border-radius);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    color: var(--text-light);
}

.empty-state i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.drug-tag {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: fadeIn 0.3s ease;
}

.drug-tag button {
    background: none;
    border: none;
    color: var(--white);
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
}

.drug-tag button:hover {
    color: #ffeaa7;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Results Container */
.results-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e9ecef;
}

.results-container h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.results-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.interaction-item {
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.interaction-high {
    background-color: #f8d7da;
    border-left: 5px solid var(--danger-color);
}

.interaction-medium {
    background-color: #fff3cd;
    border-left: 5px solid var(--warning-color);
}

.interaction-low {
    background-color: #d1ecf1;
    border-left: 5px solid var(--info-color);
}

.interaction-none {
    background-color: #d4edda;
    border-left: 5px solid var(--secondary-color);
}

.interaction-title {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-dark);
}

.interaction-description {
    margin-bottom: 0.5rem;
}

.interaction-mechanism {
    font-style: italic;
    color: var(--text-light);
}

/* Category Tabs */
.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--white);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    background-color: rgba(44, 90, 160, 0.1);
}

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

/* Interactions Content */
.interactions-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.interaction-card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.interaction-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.interaction-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.interaction-card p {
    margin-bottom: 0.5rem;
}

.severity-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.severity-high {
    background-color: var(--danger-color);
    color: var(--white);
}

.severity-medium {
    background-color: var(--warning-color);
    color: var(--text-color);
}

.severity-low {
    background-color: var(--info-color);
    color: var(--white);
}

/* Resources Section */
.resources-section {
    background-color: var(--white);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.resource-card {
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.resource-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.resource-card h4 {
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

.resource-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    margin-top: 1rem;
}

.resource-link:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: var(--primary-dark);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h5 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 1rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow-y: auto;
}

.modal-content {
    background-color: var(--white);
    margin: 5% auto;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    max-width: 600px;
    position: relative;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.close:hover {
    color: var(--text-color);
}

.disclaimer-content h4 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.disclaimer-content ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.disclaimer-content li {
    margin-bottom: 0.5rem;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .category-tabs {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
    
    .tab-btn {
        white-space: nowrap;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .checker-interface {
        padding: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}