:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-primary: #1c1e21;
    --text-secondary: #65676b;
    --accent-color: #ff4500;
    --accent-hover: #ff5414;
    --nav-bg: #ffffff;
    --border-color: #ccd0d5;
}

/* Dark Mode Preference (auto) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #18191a;
        --card-bg: #242526;
        --text-primary: #e4e6eb;
        --text-secondary: #b0b3b8;
        --border-color: #3e4042;
        --nav-bg: #242526;
    }
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
}

a { text-decoration: none; color: inherit; }

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    height: 60px;
    display: flex;
    align-items: center;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 900;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
}

.logo-icon-img { 
    width: 32px; 
    height: 32px; 
    border-radius: 50%;
    object-fit: cover;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    font-weight: 700;
    color: var(--text-secondary);
    padding: 10px 0;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent-color);
}

.nav-actions .btn {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    font-size: 0.95rem;
    transition: background 0.2s;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 700;
}

.btn-outline:hover { background: rgba(128,128,128,0.1); }

/* Layout */
.content-wrapper {
    max-width: 1200px;
    margin: 80px auto 0;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 250px minmax(0, 600px) 250px;
    gap: 2rem;
    justify-content: center;
}

.sidebar-left, .sidebar-right {
    position: sticky;
    top: 80px;
    align-self: start;
}

.trending-tags h3, .promo-box h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.trending-tags a {
    display: block;
    padding: 0.5rem 0;
    font-weight: 700;
    color: var(--text-primary);
}

.trending-tags a:hover { color: var(--accent-color); }

.promo-box {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.promo-box p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Feed */
.feed {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.meme-card {
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.meme-header {
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.meme-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #555;
}

.meme-meta h4 {
    font-size: 0.95rem;
    font-weight: 700;
}

.meme-meta span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.meme-title {
    padding: 0 1rem 1rem;
    font-size: 1.1rem;
    font-weight: 700;
}

.meme-media {
    width: 100%;
    background: #000;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.meme-media img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    max-height: 700px;
}

.meme-actions {
    padding: 1rem;
    display: flex;
    gap: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-weight: 700;
    cursor: pointer;
    font-size: 0.95rem;
}

.action-btn:hover { color: var(--accent-color); }

.action-btn svg { width: 24px; height: 24px; fill: currentColor; }

/* Loader */
.loading-indicator {
    text-align: center;
    padding: 3rem 0 5rem;
    color: var(--text-secondary);
    font-weight: 700;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem auto;
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* Responsive */
@media (max-width: 1024px) {
    .content-wrapper { grid-template-columns: 1fr; max-width: 600px; }
    .sidebar-left, .sidebar-right { display: none; }
    .nav-links { display: none; }
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    display: flex; align-items: center; justify-content: center;
    z-index: 2000;
    opacity: 0; pointer-events: none;
    transition: opacity 0.2s;
}
.modal-overlay.active {
    opacity: 1; pointer-events: auto;
}
.modal-content {
    background: var(--card-bg);
    width: 90%; max-width: 500px;
    border-radius: 12px;
    padding: 1.5rem;
    transform: translateY(-20px);
    transition: transform 0.2s;
    border: 1px solid var(--border-color);
}
.modal-overlay.active .modal-content {
    transform: translateY(0);
}
.modal-header {
    display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem;
}
.close-btn {
    background: transparent; border: none; font-size: 1.5rem; color: var(--text-secondary); cursor: pointer;
}
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px; padding: 3rem 1rem; text-align: center; color: var(--text-secondary);
    margin-bottom: 1rem; cursor: pointer; transition: background 0.2s;
}
.upload-area:hover { background: rgba(128,128,128,0.05); }
.upload-input {
    width: 100%; padding: 0.8rem; border: 1px solid var(--border-color); border-radius: 6px;
    background: transparent; color: var(--text-primary); font-family: inherit; font-size: 1rem;
}

/* Toast Notification */
.toast {
    position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(100px);
    background: var(--text-primary); color: var(--bg-color);
    padding: 0.8rem 1.5rem; border-radius: 30px; font-weight: bold;
    z-index: 3000; opacity: 0; transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.toast.show {
    transform: translateX(-50%) translateY(0); opacity: 1;
}

/* Like animation */
.action-btn.liked { color: #ff0055; }
.action-btn.liked svg { fill: #ff0055; animation: pop 0.3s; }
@keyframes pop { 0% {transform: scale(1);} 50% {transform: scale(1.3);} 100% {transform: scale(1);} }

/* Comments Section */
.comments-section {
    display: none;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background: rgba(0,0,0,0.02);
}
.comments-section.open {
    display: block;
    animation: fadeInDown 0.3s ease;
}
.comment-item {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 1rem;
}
.comment-item:last-child { margin-bottom: 0; }
.comment-avatar {
    width: 30px; height: 30px;
    border-radius: 50%;
    object-fit: cover;
}
.comment-content {
    background: var(--card-bg);
    padding: 0.6rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    width: 100%;
}
.comment-author {
    font-weight: 700;
    margin-bottom: 0.2rem;
    display: block;
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}