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

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

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

/* Header */
.header {
    background-color: #2E86AB;
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.logo {
    text-decoration: none;
    color: white;
}

.logo h1 {
    font-size: 24px;
    font-weight: bold;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 20px;
    flex-wrap: wrap;
}

.nav-list a {
    color: white;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-list a:hover {
    color: #f0f0f0;
}

/* Main Content */
.main-content {
    padding: 30px 0;
    min-height: 60vh;
}

/* Footer */
.footer {
    background-color: #2E86AB;
    color: white;
    padding: 30px 0;
    margin-top: 30px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.footer-copyright {
    font-size: 14px;
    color: white;
    margin: 0;
}

.footer-updated {
    font-size: 13px;
    color: rgba(255,255,255,0.8);
    margin: 0;
}

.footer-right {
    display: flex;
    justify-content: flex-start;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
    font-size: 14px;
}

.footer-links span {
    color: white;
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #e0e0e0;
    text-decoration: underline;
}

.footer-links .separator {
    color: rgba(255,255,255,0.6);
}

/* Converter Styles */
.converter-section {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.converter-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: bold;
    font-size: 16px;
}

.temperature-input {
    padding: 12px;
    border: 2px solid #f0f0f0;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.temperature-input:focus {
    outline: none;
    border-color: #2E86AB;
}

.result {
    font-size: 18px;
    font-weight: bold;
    color: #333;
    margin-top: 5px;
}

.reset-button {
    background-color: #2E86AB;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    align-self: flex-start;
}

.reset-button:hover {
    background-color: #256B8C;
}

.reset-button:active {
    transform: translateY(1px);
}

/* Quick Buttons */
.common-temperatures {
    margin-top: 30px;
}

.quick-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.quick-btn {
    background-color: #f5f7fa;
    color: #333;
    border: 1px solid #e0e0e0;
    padding: 12px 16px;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.quick-btn:hover {
    background-color: #e8f0fe;
    border-color: #2E86AB;
}

.quick-btn.primary {
    background-color: #2E86AB;
    color: white;
    border-color: #2E86AB;
}

.quick-btn.primary:hover {
    background-color: #256B8C;
}

/* Formula Section */
.formula-section {
    margin-top: 30px;
}

.formulas {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 15px;
}

.formula {
    background-color: #f5f7fa;
    padding: 15px;
    border-radius: 4px;
    font-size: 14px;
}

.formula-label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #666;
}

.formula-expression {
    font-family: monospace;
    font-size: 16px;
    color: #333;
}

/* Blog Styles */
.blog-post {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.blog-post h2 {
    margin-bottom: 20px;
    color: #333;
}

.blog-meta {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
}

.blog-content {
    line-height: 1.8;
}

/* Blog List */
.blog-list {
    margin-top: 30px;
}

.blog-item {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.blog-item h2 {
    margin-bottom: 10px;
}

.blog-item h2 a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

.blog-item h2 a:hover {
    color: #2E86AB;
}

.blog-item .blog-date {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
}

.blog-item p {
    margin-bottom: 20px;
    line-height: 1.6;
}

.read-more {
    display: inline-block;
    color: #2E86AB;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: #256B8C;
    text-decoration: underline;
}

/* Contact Page */
.contact-section {
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.contact-intro {
    font-size: 16px;
    color: #4A5568;
    margin-bottom: 30px;
    line-height: 1.6;
}

.contact-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.help-section h2,
.response-section h2,
.contact-info-section h2 {
    color: #2D3748;
    margin-bottom: 20px;
    font-size: 22px;
}

.help-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.help-category {
    background-color: #F7FAFC;
    padding: 25px;
    border-radius: 8px;
    border-left: 4px solid #2E86AB;
}

.help-category h3 {
    color: #2D3748;
    margin-bottom: 15px;
    font-size: 18px;
}

.help-category ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.help-category li {
    color: #4A5568;
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
}

.help-category li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: #2E86AB;
}

.response-section p,
.contact-info-section p {
    color: #4A5568;
    line-height: 1.6;
    margin-bottom: 15px;
}

.response-details {
    list-style: none;
    padding: 0;
    margin: 0;
}

.response-details li {
    color: #4A5568;
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
}

.response-details li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: #2E86AB;
    font-weight: bold;
}

.contact-info-section strong {
    color: #2D3748;
}

/* 404 Page */
.error-404 {
    text-align: center;
    padding: 60px 20px;
}

.error-404 h1 {
    font-size: 64px;
    color: #2E86AB;
    margin-bottom: 20px;
}

.error-404 h2 {
    font-size: 24px;
    margin-bottom: 20px;
}

.error-404 p {
    font-size: 16px;
    margin-bottom: 30px;
}

/* Sitemap */
.sitemap-list {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.sitemap-list ul {
    list-style: none;
}

.sitemap-list li {
    margin-bottom: 10px;
}

.sitemap-list a {
    color: #2E86AB;
    text-decoration: none;
    transition: color 0.3s ease;
}

.sitemap-list a:hover {
    color: #256B8C;
    text-decoration: underline;
}

/* Responsive Design */
@media (min-width: 768px) {
    .converter-container {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: flex-end;
    }

    .input-group {
        flex: 1;
        min-width: 300px;
    }

    .quick-buttons {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .quick-btn {
        flex: 1;
        min-width: 200px;
        text-align: center;
    }

    .formulas {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .formula {
        flex: 1;
        min-width: 300px;
    }

    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

/* Mobile Optimization */
@media (max-width: 480px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .nav-list {
        flex-direction: column;
        gap: 10px;
        width: 100%;
    }

    .nav-list li {
        width: 100%;
    }

    .converter-section {
        padding: 20px;
    }

    .reset-button {
        width: 100%;
        text-align: center;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .footer-right {
        width: 100%;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 10px;
        align-items: flex-start;
    }
}

/* Core Web Vitals Optimization */
img {
    max-width: 100%;
    height: auto;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Print Styles */
@media print {
    .ad-container {
        display: none;
    }

    .nav {
        display: none;
    }

    .footer {
        margin-top: 30px;
    }
}