:root {
    --primary-color: #5FE3C4;
    --primary-hover: #4BC5A8;
    --text-color: #0D2538;
    --light-text: #4A5568;
    --background: #ffffff;
    --light-bg: #F8FAFC;
    --border-color: #E2E8F0;
    --card-bg: #ffffff;
    --max-width: 1200px;
    --header-height: 60px;
}

.dark-theme {
    --text-color: #ffffff;
    --light-text: #CBD5E0;
    --background: #0D2538;
    --light-bg: #1A365D;
    --border-color: #2D3748;
    --card-bg: #1A365D;
}

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

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

/* Header & Navigation */
header {
    background: var(--background);
    box-shadow: 0 2px 4px rgba(13, 37, 56, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.main-nav {
    max-width: var(--max-width);
    margin: 0 auto;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.nav-left, .nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-left a, .nav-right a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-left a:hover {
    color: var(--primary-color);
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    padding: 8px 0;
}

.logo object, .logo img {
    height: 32px;
    width: auto;
    transition: transform 0.2s ease;
}

.logo:hover object, .logo:hover img {
    transform: scale(1.02);
}

.download-button {
    background: var(--primary-color);
    color: var(--text-color) !important;
    padding: 8px 20px;
    border-radius: 4px;
    transition: all 0.2s;
    font-weight: 600;
}

.download-button:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.search-button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--text-color);
    transition: color 0.2s;
}

.search-button:hover {
    color: var(--primary-color);
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px;
    font-size: 1.2rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0D2538, #1A365D);
    color: white;
    padding: 140px 20px 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--background);
    transform: skewY(-3deg);
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 1.5rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.primary-button, .secondary-button {
    padding: 14px 28px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.primary-button {
    background: var(--primary-color);
    color: var(--text-color);
}

.secondary-button {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.5);
}

.primary-button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.secondary-button:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
    border-color: white;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--light-bg);
    position: relative;
    overflow: hidden;
}

.feature-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: nowrap;
    padding: 0 24px;
}

.feature-card {
    background: var(--card-bg);
    padding: 32px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(13, 37, 56, 0.1);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    flex: 1;
    max-width: 280px;
    min-width: 240px;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(13, 37, 56, 0.2);
}

.feature-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.feature-card p {
    color: var(--light-text);
    margin-bottom: 20px;
    flex-grow: 1;
}

.feature-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s;
}

.feature-link:hover {
    gap: 10px;
}

/* Tools Section */
.tools {
    padding: 80px 20px;
    background: var(--background);
}

.tools h2, .ecosystem h2, .learning h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5rem;
    color: var(--text-color);
}

.tools-grid, .ecosystem-grid, .learning-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.tool-card, .eco-card, .learning-card {
    background: var(--card-bg);
    padding: 35px;
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.tool-card:hover, .eco-card:hover, .learning-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(13, 37, 56, 0.2);
    border-color: transparent;
}

.tool-card i, .eco-card i, .learning-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.tool-card h3, .eco-card h3, .learning-card h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.tool-card p, .eco-card p, .learning-card p {
    color: var(--light-text);
    margin-bottom: 20px;
}

/* Ecosystem Section */
.ecosystem {
    padding: 100px 20px;
    background: var(--light-bg);
}

/* Learning Section */
.learning {
    padding: 100px 20px;
    background: var(--background);
}

/* News Section */
.news {
    padding: 100px 20px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.news h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5rem;
    color: var(--text-color);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.news-card {
    padding: 35px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
    background: var(--card-bg);
}

.news-card:hover {
    box-shadow: 0 8px 20px rgba(13, 37, 56, 0.2);
    border-color: transparent;
}

.news-date {
    color: var(--light-text);
    font-size: 0.9rem;
    display: block;
    margin-bottom: 10px;
}

.news-card h3 {
    margin-bottom: 15px;
    color: var(--text-color);
    font-size: 1.4rem;
}

.news-card p {
    color: var(--light-text);
    margin-bottom: 20px;
}

.learn-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: gap 0.2s;
}

.learn-more:hover {
    gap: 10px;
}

/* Footer */
footer {
    background: var(--light-bg);
    padding: 80px 20px 20px;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
}

.footer-section h4 {
    margin-bottom: 25px;
    color: var(--text-color);
    font-size: 1.2rem;
}

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

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

.footer-section ul li a {
    color: var(--light-text);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 60px auto 0;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--light-text);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .feature-grid {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .feature-card {
        flex: 0 0 calc(50% - 24px);
        max-width: none;
    }
}

@media (max-width: 768px) {
    .feature-card {
        flex: 0 0 100%;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
        padding: 0 20px;
    }
    
    .primary-button, .secondary-button {
        justify-content: center;
    }
    
    .nav-left a:not(.logo) {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero {
        padding: 120px 20px 80px;
    }
    
    .features, .tools, .ecosystem, .learning, .news {
        padding: 60px 20px;
    }
    
    .feature-card, .tool-card, .eco-card, .learning-card {
        padding: 25px;
    }
}