/* Global Styles */
:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --accent-color: #f72585;
    --success-color: #4cc9f0;
    --warning-color: #fca311;
    --danger-color: #e63946;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --text-color: #333;
    --text-light: #6c757d;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    font-size: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    box-shadow: 0 4px 6px rgba(67, 97, 238, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(67, 97, 238, 0.4);
    color: var(--white);
}

.secondary-btn {
    background-color: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* 导航栏样式 */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #2c3e50;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    margin-left: 10px;
    color: #3498db;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: #3498db;
}

.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: #2c3e50;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f5f7ff, #e3e8ff);
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(67, 97, 238, 0.1) 0%, rgba(67, 97, 238, 0) 70%);
    animation: float 15s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 500px;
}

.hero-content h1 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.hero-content p {
    margin-bottom: 2rem;
    font-size: 1.1rem;
    color: var(--text-light);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    animation: pulse 3s ease-in-out infinite;
}

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

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    position: relative;
    display: inline-block;
    padding-bottom: 10px;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    border-radius: 3px;
}

/* Featured Tools */
.featured-tools {
    padding: 5rem 0;
}

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

.tool-card {
    background-color: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tool-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
}

.tool-card:nth-child(1)::before {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}

.tool-card:nth-child(2)::before {
    background: linear-gradient(to right, var(--success-color), var(--primary-color));
}

.tool-card:nth-child(3)::before {
    background: linear-gradient(to right, var(--warning-color), var(--accent-color));
}

.tool-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--white);
}

.financial-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.scientific-icon {
    background: linear-gradient(135deg, var(--success-color), var(--primary-color));
}

.converter-icon {
    background: linear-gradient(135deg, var(--warning-color), var(--accent-color));
}

.tool-link {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 500;
    color: var(--primary-color);
}

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

/* How It Works */
.how-it-works {
    background-color: var(--white);
    padding: 5rem 0;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.step {
    text-align: center;
    padding: 2rem;
    background-color: var(--light-color);
    border-radius: 12px;
    position: relative;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: 1.5rem;
}

/* Testimonials */
.testimonials {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f5f7ff, #e3e8ff);
}

.testimonial-slider {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    padding: 1rem 0;
    scroll-snap-type: x mandatory;
}

.testimonial-slider::-webkit-scrollbar {
    height: 6px;
}

.testimonial-slider::-webkit-scrollbar-track {
    background: var(--light-color);
    border-radius: 10px;
}

.testimonial-slider::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 10px;
}

.testimonial {
    flex: 0 0 400px;
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    scroll-snap-align: start;
}

.testimonial-text {
    font-style: italic;
    margin-bottom: 1.5rem;
    position: relative;
    padding-left: 1.5rem;
}

.testimonial-text::before {
    content: '"';
    position: absolute;
    left: 0;
    top: -10px;
    font-size: 3rem;
    color: rgba(67, 97, 238, 0.1);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.testimonial-author img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.author-info h4 {
    margin-bottom: 0;
}

.author-info p {
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Blog Preview */
.blog-preview {
    padding: 5rem 0;
    background-color: var(--white);
}

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

.blog-post {
    background-color: var(--light-color);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.blog-post:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
}

.blog-post img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.post-content {
    padding: 1.5rem;
}

.post-date {
    display: inline-block;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.read-more {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 500;
    position: relative;
    padding-right: 20px;
}

.read-more::after {
    content: '→';
    position: absolute;
    right: 0;
    top: 0;
    transition: var(--transition);
}

.read-more:hover::after {
    right: -5px;
}

/* Newsletter */
.newsletter {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    text-align: center;
}

.newsletter h2 {
    color: var(--white);
}

.newsletter-form {
    display: flex;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
    margin-top: 2rem;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
}

/* 页脚样式 */
.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo h2 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #fff;
}

.footer-logo p {
    color: #bdc3c7;
}

.footer-links h3,
.footer-contact h3,
.footer-social h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #fff;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    text-decoration: none;
    color: #bdc3c7;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #3498db;
}

.contact-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background-color: #3498db;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.contact-btn:hover {
    background-color: #2980b9;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: #3498db;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-legal {
    margin-bottom: 15px;
}

.footer-legal a {
    text-decoration: none;
    color: #bdc3c7;
    margin: 0 15px;
    transition: color 0.3s ease;
}

.footer-legal a:hover {
    color: #3498db;
}

.footer-bottom p {
    color: #95a5a6;
    font-size: 0.9rem;
}

/* Tools Page */
.tools-page {
    padding: 4rem 0;
}

.tool-section {
    background-color: var(--white);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow);
}

.tool-section h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

/* Calculator Styles */
.calculator {
    max-width: 600px;
    margin: 0 auto;
}

.calculator-display {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 1rem;
    border-radius: 8px 8px 0 0;
    text-align: right;
    font-size: 1.5rem;
}

.calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background-color: var(--light-color);
    border-radius: 0 0 8px 8px;
}

/* Scientific Calculator Button Styles */
.sci-btn {
    padding: 1.5rem 1rem; /* Increased vertical padding */
    border: none;
    background-color: var(--white);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
}

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

.sci-btn.function {
    background-color: #e9ecef;
    color: var(--text-color);
}

.sci-btn.function:hover {
    background-color: #dee2e6;
}

.sci-btn.operator {
    background-color: var(--warning-color);
    color: var(--white);
}

.sci-btn.operator:hover {
    background-color: #e89f10;
}

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

.sci-btn.equals:hover {
    background-color: #3a56d4;
}

.sci-btn.clear {
    background-color: var(--danger-color);
    color: var(--white);
}

.sci-btn.clear:hover {
    background-color: #d62828;
}

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

.sci-btn.number:hover {
    background-color: var(--light-color);
}

.calc-btn {
    padding: 1rem;
    border: none;
    background-color: var(--white);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
}

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

.calc-btn.operator {
    background-color: var(--warning-color);
    color: var(--white);
}

.calc-btn.operator:hover {
    background-color: #e89f10;
}

.calc-btn.equals {
    background-color: var(--primary-color);
    color: var(--white);
    grid-column: span 2;
}

.calc-btn.equals:hover {
    background-color: #3a56d4;
}

.calc-btn.clear {
    background-color: var(--danger-color);
    color: var(--white);
}

.calc-btn.clear:hover {
    background-color: #d62828;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

/* About Page */
.about-page {
    padding: 4rem 0;
}

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

.about-text h2 {
    color: var(--primary-color);
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
}

/* Contact Page */
.contact-page {
    padding: 4rem 0;
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    background-color: var(--white);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.contact-info h2 {
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.contact-email {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary-color);
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: 8px;
    margin-bottom: 2rem;
}

/* Privacy Policy & Terms Pages */
.privacy-page, .terms-page {
    padding: 4rem 0;
}

.privacy-content, .terms-content {
    background-color: var(--white);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.privacy-content h2, .terms-content h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.privacy-content h3, .terms-content h3 {
    color: var(--secondary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.privacy-content ul, .terms-content ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.privacy-content li, .terms-content li {
    margin-bottom: 0.5rem;
}

/* Blog Page */
.blog-page {
    padding: 4rem 0;
}

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

.blog-header h1 {
    color: var(--primary-color);
}

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

.single-post {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.single-post:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.post-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.post-details {
    padding: 1.5rem;
}

.post-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.post-categories {
    display: flex;
    gap: 0.5rem;
}

.post-category {
    background-color: var(--light-color);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        margin-bottom: 2rem;
    }
    
    .cta-buttons {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        padding: 2rem 0;
        gap: 1.5rem;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        transform: translateY(-150%);
        transition: var(--transition);
        z-index: 999;
    }
    
    .nav-links.active {
        transform: translateY(0);
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .calculator-buttons {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .calc-btn.equals {
        grid-column: span 3;
    }
}

@media (max-width: 576px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .tool-card, .testimonial, .blog-post {
        padding: 1.5rem;
    }
    
    .privacy-content, .terms-content, .contact-info {
        padding: 2rem;
    }
}