:root {
    /* Light Theme */
    --primary-color: #ff3e6c;
    --primary-hover: #e62e5a;
    --bg-color: #f8f9fa;
    --header-bg: #ffffff;
    --text-main: #212529;
    --text-secondary: #6c757d;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --nav-bg: #ffffff;
    --nav-text: #495057;
    --nav-active: #ff3e6c;
    --modal-bg: #ffffff;
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    --btn-secondary-bg: #e9ecef;
    --btn-secondary-text: #495057;
    --container-max-width: 1000px;
}

[data-theme='dark'] {
    /* Dark Theme */
    --bg-color: #121212;
    --header-bg: #1e1e1e;
    --text-main: #f8f9fa;
    --text-secondary: #adb5bd;
    --card-bg: #1e1e1e;
    --border-color: #2d2d2d;
    --nav-bg: #1e1e1e;
    --nav-text: #adb5bd;
    --nav-active: #ff3e6c;
    --modal-bg: #2d2d2d;
    --input-bg: #3d3d3d;
    --input-border: #4d4d4d;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --btn-secondary-bg: #3d3d3d;
    --btn-secondary-text: #f8f9fa;
}

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

html {
    font-size: 16px;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Header */
.header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: none;
}

.header-left {
    display: flex;
    flex-direction: column;
}

.user-display {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: -0.2rem;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: 0.2rem;
    background-color: var(--btn-secondary-bg);
    padding: 0.25rem;
    border-radius: 10px;
}

.lang-btn {
    background: none;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.3rem;
    border-radius: 6px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    min-height: 32px;
}

.lang-btn:hover {
    background-color: var(--header-bg);
}

.lang-btn.active {
    background-color: var(--header-bg);
    box-shadow: var(--shadow);
}

/* Navigation */
.nav {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 60px; /* Below header */
    z-index: 90;
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 0.5rem;
}

.category-tabs {
    display: flex;
    list-style: none;
    overflow-x: auto;
    scrollbar-width: none; /* Hide scrollbar for Firefox */
    -ms-overflow-style: none; /* Hide scrollbar for IE/Edge */
}

.category-tabs::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome/Safari */
}

.tab {
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--nav-text);
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
    white-space: nowrap;
    font-size: 0.95rem;
}

.tab.active {
    color: var(--nav-active);
    border-bottom-color: var(--nav-active);
}

/* Main Content */
.main-content {
    max-width: var(--container-max-width);
    margin: 1.5rem auto;
    padding: 0 1rem;
    min-height: 60vh;
}

.category-info {
    margin-bottom: 1.5rem;
}

.category-info h2 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
    font-weight: 800;
}

.category-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Posts List */
.posts-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
    position: relative;
    cursor: pointer;
}

.post-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.post-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
}

.post-card.expanded .post-header {
    margin-bottom: 1rem;
}

.post-meta {
    display: flex;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    align-items: center;
}

.post-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0.2rem 0;
    flex: 1;
    color: var(--text-main);
}

.post-card.expanded .post-title {
    font-size: 1.3rem;
    color: var(--primary-color);
}

.post-actions {
    display: flex;
    gap: 0.4rem;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.4rem;
    border-radius: 6px;
    color: var(--text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    min-height: 32px;
}

.btn-icon:hover {
    background-color: var(--btn-secondary-bg);
    color: var(--text-main);
}

.btn-icon.like-btn.active {
    color: var(--primary-color);
    font-weight: 700;
}

/* Hidden by default in list view */
.post-content,
.post-image-container,
.comments-section {
    display: none;
}

/* Revealed in expanded view */
.post-card.expanded .post-content,
.post-card.expanded .post-image-container,
.post-card.expanded .comments-section {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.post-content {
    font-size: 1rem;
    white-space: pre-wrap;
    word-break: break-word;
    margin: 1rem 0;
    color: var(--text-main);
}

.post-image-container {
    margin: 1rem 0;
    border-radius: 12px;
    overflow: hidden;
    background-color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    max-height: 500px;
}

.post-image-container img {
    max-width: 100%;
    max-height: 500px;
    height: auto;
    object-fit: contain;
    display: block;
}

/* Comments Section */
.comments-section {
    border-top: 1px solid var(--border-color);
    margin-top: 1.5rem;
    padding-top: 1.25rem;
}

.comment-item {
    background-color: var(--bg-color);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    margin-bottom: 0.75rem;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.comment-content {
    font-size: 0.9rem;
    line-height: 1.5;
}

.comment-input-area {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.comment-input {
    flex: 1;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-main);
    font-size: 0.9rem;
}

/* Footer Styling */
.footer {
    background-color: var(--header-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    margin-top: 4rem;
    color: var(--text-secondary);
    text-align: center;
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.footer-about {
    font-size: 0.9rem;
    max-width: 600px;
    margin: 0 auto;
}

.footer-nav {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
}

.footer-nav a:hover {
    color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 0.6rem 1.25rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    align-items: center; justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-overlay.active { display: flex; }

.modal {
    background-color: var(--modal-bg);
    width: 95%;
    max-width: 600px;
    border-radius: 20px;
    overflow: hidden;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex; justify-content: space-between; align-items: center;
}

.form-group { padding: 1.25rem 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; font-size: 0.9rem; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 0.75rem; border-radius: 10px;
    border: 1px solid var(--input-border); background-color: var(--input-bg);
    color: var(--text-main); font-size: 1rem;
}

/* Media Queries for full responsiveness */

/* Desktop & Tablet */
@media (min-width: 768px) {
    .header { padding: 1rem 0; }
    .logo { font-size: 1.75rem; }
    .post-card { padding: 1.25rem 1.75rem; }
    .post-title { font-size: 1.15rem; }
    .category-info h2 { font-size: 2.25rem; }
}

/* Mobile Specific */
@media (max-width: 600px) {
    .header-actions .btn-write {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
    .lang-switcher { gap: 0.1rem; }
    .lang-btn { font-size: 1rem; min-width: 28px; }
    .tab { padding: 0.75rem 1rem; font-size: 0.85rem; }
    .category-info h2 { font-size: 1.5rem; }
    .post-title { font-size: 1rem; }
    .footer { padding: 2rem 0; }
    .footer-nav { gap: 1rem; }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
}