:root {
    --primary: #1e3d59;
    --secondary: #ff6e40;
    --accent: #ffc13b;
    --light: #f5f5f5;
}

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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--primary);
    background: linear-gradient(135deg, #e0f7fa 0%, #b2ebf2 100%);
    min-height: 100vh;
}

header {
    background: var(--primary);
    color: white;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.wave-animation {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='0.3' d='M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,213.3C1248,235,1344,213,1392,202.7L1440,192L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
    animation: wave 10s linear infinite;
}

@keyframes wave {
    0% { background-position-x: 0; }
    100% { background-position-x: 1440px; }
}

.tagline {
    font-size: 1.2rem;
    margin-top: 1rem;
}

.sponsor {
    font-style: italic;
    margin-top: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: transform 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
}

.slack-btn {
    background: #4A154B;
    color: white;
    text-decoration: none;
}

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

.messages {
    margin: 1rem 0;
}

.message {
    border-bottom: 1px solid #eee;
    padding: 1rem 0;
}

.message-header {
    display: flex;
    justify-content: space-between;
    color: #666;
    font-size: 0.9rem;
}

.post-message {
    margin-top: 1rem;
}

textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 1rem;
    resize: vertical;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

input {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.secondary {
    background: #gray;
    color: var(--primary);
}

footer {
    text-align: center;
    padding: 2rem;
    background: var(--primary);
    color: white;
}

@media (max-width: 768px) {
    .buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
}