:root {
    --color-blue: #2563eb;
    --color-light-blue: #3b82f6;
    --color-gray: #6b7280;
    --color-light-gray: #f3f4f6;
    --color-green: #22c55e;
    --color-light-green: #bbf7d0;
    --color-bg: var(--color-light-gray);
    --color-text: #1e293b;
}

body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background: var(--color-blue);
    color: #fff;
    padding: 1rem 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

nav {
    display: flex;
    gap: 1.5rem;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.main-content {
    max-width: 800px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.07);
    padding: 2rem;
}

.profile-card {
    display: flex;
    align-items: center;
    background: var(--color-light-green);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 2rem;
}

.profile-card img {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin-right: 1rem;
    border: 2px solid var(--color-green);
}

.profile-card .info {
    flex: 1;
}

.button {
    background: var(--color-green);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 0.5rem 1.2rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

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

.post {
    background: var(--color-light-gray);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--color-blue);
}

.post .author {
    color: var(--color-gray);
    font-size: 0.95rem;
}

.post .content {
    margin-top: 0.5rem;
    color: var(--color-text);
}

input, textarea {
    border: 1px solid var(--color-gray);
    border-radius: 6px;
    padding: 0.5rem;
    font-size: 1rem;
    margin-bottom: 1rem;
    width: 100%;
    background: #fff;
    transition: border 0.2s;
}

input:focus, textarea:focus {
    border-color: var(--color-blue);
    outline: none;
}