:root {
    --bg-color: #0f172a;
    --card-color: #1e293b;
    --primary-text-color: #e2e8f0;
    --secondary-text-color: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover-color: #0ea5e9;
    --border-color: #334155;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 1rem;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero .tagline {
    font-size: 1.2rem;
    color: var(--secondary-text-color);
    max-width: 600px;
    margin: 0 auto 2rem auto;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 0.8rem 1.6rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: var(--accent-hover-color);
}

/* Project Section */
.project-category {
    margin-bottom: 4rem;
}

.project-category h2 {
    font-size: 2.2rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background-color: var(--card-color);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.project-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.project-card p {
    color: var(--secondary-text-color);
    flex-grow: 1;
    margin-bottom: 1rem;
}

.version-badge {
    align-self: flex-start;
    background-color: var(--border-color);
    color: var(--primary-text-color);
    font-size: 0.8rem;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    margin-bottom: 1rem;
}

.project-link {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    text-decoration: none;
    text-align: center;
    font-weight: 500;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.project-link:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

/* Message Section */
.message-section {
    background-color: var(--card-color);
    padding: 2rem;
    border-radius: 12px;
    margin-top: 2rem;
    border: 1px solid var(--border-color);
}

.message-section h2 {
    text-align: center;
    margin-bottom: 1.5rem;
}

#message-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

#message-form textarea {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.8rem;
    font-family: 'Space Grotesk', sans-serif;
    color: var(--primary-text-color);
    resize: vertical;
    min-height: 80px;
}

#message-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.3);
}

#message-form button {
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 0.8rem 1.6rem;
    border-radius: 8px;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
}

#message-form button:hover {
    background-color: var(--accent-hover-color);
}

#message-display-area {
    margin-top: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

#message-display-area h3 {
    margin-bottom: 1rem;
}

#message-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message-item {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    font-style: italic;
    color: var(--secondary-text-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    color: var(--secondary-text-color);
    border-top: 1px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero .tagline {
        font-size: 1rem;
    }

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