:root {
    --color-primary: #00BCD4;
    --color-primary-dark: #00838F;
    --color-bg: #E0F7FA;
    --color-text: #001F24;
    --color-surface: #FFFFFF;
    --color-promo-bg: #00838F;
    --color-promo-text: #FFFFFF;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Promo Banner */
.promo-banner {
    background-color: var(--color-promo-bg);
    color: var(--color-promo-text);
    text-align: center;
    padding: 10px 20px;
    font-weight: 600;
    font-size: 0.95rem;
}

.promo-banner a {
    color: var(--color-promo-text);
    text-decoration: underline;
    margin-left: 5px;
}

.promo-banner a:hover {
    opacity: 0.8;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 80px 0;
    background: linear-gradient(180deg, #B2EBF2 0%, #E0F7FA 100%);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--color-primary-dark);
    margin-bottom: 10px;
}

.hero .subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--color-text);
}

.hero-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 40px auto;
    opacity: 0.9;
}

/* Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-surface);
    box-shadow: 0 4px 15px rgba(0, 188, 212, 0.3);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 188, 212, 0.4);
}

/* Features Section */
.features {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 50px;
    color: var(--color-primary-dark);
}

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

.feature-card {
    background-color: var(--color-surface);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 31, 36, 0.05);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--color-primary-dark);
}

.highlight-card {
    background-color: var(--color-primary);
    color: var(--color-surface);
    text-align: center;
    padding: 50px 30px;
    margin-bottom: 60px;
}

.highlight-card h2 {
    color: var(--color-surface);
    font-size: 2rem;
    margin-bottom: 20px;
}

.highlight-card p {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 15px auto;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid rgba(0, 31, 36, 0.1);
    margin-top: 40px;
}

footer p {
    margin-bottom: 10px;
    opacity: 0.8;
}

footer a {
    color: var(--color-primary-dark);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .hero .subtitle {
        font-size: 1.2rem;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .navbar {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    .nav-links a {
        margin-left: 10px;
        margin-right: 10px;
    }
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo-link {
    text-decoration: none;
    color: inherit;
}

.navbar .logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--color-primary-dark);
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text);
    margin-left: 20px;
    font-weight: 600;
}

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

.nav-links a.nav-active {
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: 2px;
}

/* Blog Styles */
.blog-hero {
    padding: 60px 0 40px 0;
}

.blog-list {
    display: grid;
    gap: 30px;
    margin-bottom: 60px;
}

.blog-card {
    background-color: var(--color-surface);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 31, 36, 0.05);
}

.post-meta {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 10px;
}

.post-title {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.post-title a {
    text-decoration: none;
    color: var(--color-primary-dark);
}

.post-title a:hover {
    text-decoration: underline;
}

.post-excerpt {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--color-text);
    opacity: 0.9;
}

.read-more {
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.read-more:hover {
    text-decoration: underline;
}