:root {
    --bg-color: #fafafa;
    --text-color: #1a1a1a;
    --accent-color: #666;
    --border-color: #e5e5e5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

/* --- Profile Header Styles --- */
.profile-header {
    margin-bottom: 3rem;
    text-align: center;
}

h1 {
    font-weight: 600;
    font-size: 2.2rem;
    letter-spacing: -0.5px;
    margin-bottom: 0.2rem;
    color: var(--text-color);
}

.profile-headline {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-color);
    margin: 0.5rem 0 1.5rem 0;
    line-height: 1.5;
}

.headline-divider {
    color: #ccc;
    margin: 0 8px;
    font-weight: 300;
}

.headline-sub {
    color: var(--accent-color);
}

.subtitle {
    color: var(--accent-color);
    font-size: 1rem;
    margin-top: 0;
    font-style: italic;
}

/* --- Navigation Styles --- */
.theme-nav {
    display: flex;
    gap: 0.8rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.theme-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--accent-color);
    transition: all 0.2s ease;
}

.theme-btn:hover {
    border-color: var(--text-color);
    color: var(--text-color);
}

.theme-btn.active {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
}

/* --- Content & Feed Styles --- */
.theme-section {
    display: none;
}

.theme-section.active {
    display: block;
    animation: fadeIn 0.4s ease-in-out;
}

h2 {
    font-weight: 500;
    font-size: 1.4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
}

.post-container {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
    overflow: hidden;
}

.placeholder {
    text-align: center;
    color: var(--accent-color);
    font-style: italic;
    padding: 2rem 0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}