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

:root {
    --light-blue: #87CEEB;
    --darker-blue: #4682B4;
    --dark-blue: #1E3A5F;
    --black: #000000;
    --white: #FFFFFF;
    --gray: #F5F5F5;
}

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

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

/* Header */
header {
    background-color: var(--black);
    padding: 1.5rem 0;
    border-bottom: 2px solid var(--darker-blue);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

.logo-img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--darker-blue);
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--light-blue);
}

nav {
    display: flex;
    gap: 2rem;
}

nav a {
    color: var(--light-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--white);
}

/* Hero Section */
.hero {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--black) 0%, var(--dark-blue) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--light-blue);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--white);
    opacity: 0.9;
}

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

.btn {
    padding: 0.75rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--light-blue);
    color: var(--black);
}

.btn-primary:hover {
    background-color: var(--darker-blue);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--light-blue);
    border-color: var(--light-blue);
}

.btn-secondary:hover {
    background-color: var(--light-blue);
    color: var(--black);
}

/* Message Network */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.message-network {
    position: relative;
    width: 300px;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.envelope {
    position: relative;
    width: 120px;
    height: 80px;
    background-color: var(--light-blue);
    border: 3px solid var(--darker-blue);
    border-radius: 5px;
    z-index: 2;
    animation: float 3s ease-in-out infinite;
}

.envelope-flap {
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    height: 40px;
    background-color: var(--darker-blue);
    border-radius: 5px 5px 0 0;
    clip-path: polygon(0 0, 50% 100%, 100% 0);
}

.envelope-body {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background-color: var(--light-blue);
}

.message-bubble {
    position: absolute;
    width: 60px;
    height: 60px;
    background-color: var(--darker-blue);
    border: 2px solid var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    animation: pulse 2s ease-in-out infinite;
}

.message-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.message-2 {
    top: 10%;
    right: 10%;
    animation-delay: 0.5s;
}

.message-3 {
    bottom: 10%;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: 1s;
}

.connection-line {
    position: absolute;
    background: linear-gradient(to right, var(--darker-blue), var(--light-blue));
    height: 2px;
    opacity: 0.6;
    animation: flow 2s ease-in-out infinite;
}

.line-1 {
    top: 25%;
    left: 25%;
    width: 80px;
    transform: rotate(-30deg);
    animation-delay: 0s;
}

.line-2 {
    top: 25%;
    right: 25%;
    width: 80px;
    transform: rotate(30deg);
    animation-delay: 0.3s;
}

.line-3 {
    bottom: 25%;
    left: 50%;
    width: 60px;
    transform: translateX(-50%) rotate(90deg);
    animation-delay: 0.6s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes flow {
    0%, 100% {
        opacity: 0.3;
    }
    50% {
        opacity: 0.8;
    }
}

/* Features Section */
.features {
    padding: 5rem 0;
    background-color: var(--black);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--light-blue);
}

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

.feature-card {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--darker-blue) 100%);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    border: 2px solid var(--darker-blue);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(135, 206, 235, 0.3);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--light-blue);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.feature-card p {
    color: var(--white);
    opacity: 0.9;
}

/* About Section */
.about {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--black) 100%);
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--light-blue);
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--white);
    opacity: 0.9;
}

/* Contact Section */
.contact {
    padding: 5rem 0;
    background-color: var(--black);
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--light-blue);
}

.contact > .container > p {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--white);
    opacity: 0.9;
}

.contact-email {
    display: flex;
    justify-content: center;
    align-items: center;
}

.email-link {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 3rem;
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--darker-blue) 100%);
    border: 2px solid var(--light-blue);
    border-radius: 10px;
    color: var(--light-blue);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.email-link:hover {
    background: linear-gradient(135deg, var(--darker-blue) 0%, var(--light-blue) 100%);
    color: var(--black);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(135, 206, 235, 0.4);
}

.email-icon {
    font-size: 1.5rem;
}

/* Footer */
footer {
    background-color: var(--dark-blue);
    padding: 2rem 0;
    text-align: center;
    border-top: 2px solid var(--darker-blue);
}

footer p {
    color: var(--light-blue);
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .cta-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    nav {
        gap: 1rem;
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}