/* ==================== RESET & VARIABLES ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Light Theme (Default) */
    --primary-color: #1877f2;
    --primary-dark: #166fe5;
    --secondary-color: #42b72a;
    --secondary-dark: #36a420;
    --dark-color: #1c1e21;
    --light-color: #f0f2f5;
    --text-color: #050505;
    --text-secondary: #65676b;
    --gray-color: #65676b;
    --gray-light: #e4e6eb;
    --border-color: #dddfe2;
    --white: #ffffff;
    --error-color: #dc3545;
    --error-light: #f8d7da;
    --success-color: #28a745;
    --success-light: #d4edda;
    --warning-color: #ffc107;
    --warning-light: #fff3cd;
    --info-color: #17a2b8;
    --info-light: #d1ecf1;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --border-radius-lg: 10px;
    --border-radius-sm: 5px;
    --transition: all 0.3s ease;
    
    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    
    /* Font sizes */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-md: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 2rem;
    --font-4xl: 2.5rem;
}

/* Dark Theme Variables */
.dark-theme {
    --primary-color: #1877f2;
    --primary-dark: #166fe5;
    --secondary-color: #42b72a;
    --secondary-dark: #36a420;
    --light-color: #1a1a1a;
    --dark-color: #f0f2f5;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --gray-color: #b0b0b0;
    --gray-light: #404040;
    --border-color: #404040;
    --white: #2d2d2d;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.3);
}

/* ==================== TYPOGRAPHY ==================== */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--light-color);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 16px;
    transition: background-color 0.3s, color 0.3s;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-4xl); }
h2 { font-size: var(--font-3xl); }
h3 { font-size: var(--font-2xl); }
h4 { font-size: var(--font-xl); }
h5 { font-size: var(--font-lg); }
h6 { font-size: var(--font-md); }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    text-decoration: underline;
}

/* ==================== UTILITY CLASSES ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-success { color: var(--success-color); }
.text-error { color: var(--error-color); }
.text-warning { color: var(--warning-color); }
.text-info { color: var(--info-color); }

.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-success { background-color: var(--success-color); }
.bg-error { background-color: var(--error-color); }
.bg-warning { background-color: var(--warning-color); }
.bg-info { background-color: var(--info-color); }
.bg-light { background-color: var(--light-color); }
.bg-white { background-color: var(--white); }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

/* ==================== ALERTS ==================== */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-sm);
    border: 1px solid transparent;
}

.alert-error {
    background-color: var(--error-light);
    border-color: #f5c6cb;
    color: #721c24;
}

.alert-success {
    background-color: var(--success-light);
    border-color: #c3e6cb;
    color: #155724;
}

.alert-warning {
    background-color: var(--warning-light);
    border-color: #ffeeba;
    color: #856404;
}

.alert-info {
    background-color: var(--info-light);
    border-color: #bee5eb;
    color: #0c5460;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
    line-height: 1.5;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    box-shadow: 0 4px 8px rgba(24, 119, 242, 0.3);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-dark);
    box-shadow: 0 4px 8px rgba(66, 183, 42, 0.3);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: var(--white);
}

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

.btn-danger:hover:not(:disabled) {
    background-color: #c82333;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-small {
    padding: 5px 10px;
    font-size: var(--font-sm);
}

.btn-large {
    padding: 15px 30px;
    font-size: var(--font-lg);
}

/* ==================== FORMS ==================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="tel"],
.form-group input[type="url"],
.form-group input[type="date"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-md);
    background-color: var(--white);
    color: var(--text-color);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(24, 119, 242, 0.1);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--error-color);
}

.form-group .error-message {
    color: var(--error-color);
    font-size: var(--font-sm);
    margin-top: var(--spacing-xs);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

/* Password input */
.password-input {
    position: relative;
}

.password-input input {
    padding-right: 40px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--gray-color);
    z-index: 1;
}

/* Checkbox and Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: auto;
    margin-right: var(--spacing-xs);
}

/* Terms checkbox */
.terms {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.terms input[type="checkbox"] {
    width: auto;
}

.terms label {
    margin-bottom: 0;
    font-size: var(--font-sm);
}

.terms a {
    color: var(--primary-color);
    text-decoration: none;
}

.terms a:hover {
    text-decoration: underline;
}

/* ==================== AUTH PAGES ==================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-lg);
}

.auth-container {
    width: 100%;
    max-width: 450px;
}

.auth-box {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-header h1 {
    color: var(--primary-color);
    font-size: var(--font-4xl);
    margin-bottom: var(--spacing-sm);
}

.auth-header p {
    color: var(--text-secondary);
    font-size: var(--font-md);
}

.auth-links {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-links a:hover {
    text-decoration: underline;
}

.auth-divider {
    text-align: center;
    margin: var(--spacing-lg) 0;
    position: relative;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background-color: var(--border-color);
}

.auth-divider::before {
    left: 0;
}

.auth-divider::after {
    right: 0;
}

.auth-divider span {
    background-color: var(--white);
    padding: 0 var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--font-sm);
}

.social-login {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.btn-google {
    background-color: var(--white);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-google:hover {
    background-color: var(--light-color);
}

.btn-google i {
    color: #DB4437;
}

/* ==================== NAVBAR ==================== */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0 var(--spacing-lg);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo:hover {
    text-decoration: none;
}

.search-box {
    position: relative;
    width: 250px;
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-color);
}

.search-box input {
    width: 100%;
    padding: 8px 12px 8px 35px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: var(--font-sm);
    background-color: var(--light-color);
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    background-color: var(--white);
    border-color: var(--primary-color);
}

.nav-center {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-link {
    padding: 0 var(--spacing-md);
    height: 60px;
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    font-size: var(--font-xl);
    border-bottom: 3px solid transparent;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--light-color);
    text-decoration: none;
}

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

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: 5px 10px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-user:hover {
    background-color: var(--light-color);
}

.nav-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.nav-icons {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-icons i {
    font-size: var(--font-xl);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.nav-icons i:hover {
    color: var(--primary-color);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    display: none;
    z-index: 1000;
    overflow: hidden;
}

.dropdown-menu.show {
    display: block;
    animation: slideDown 0.3s ease;
}

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

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 12px 20px;
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background-color: var(--light-color);
    text-decoration: none;
}

.dropdown-menu a i {
    width: 20px;
    color: var(--primary-color);
}

/* ==================== MAIN LAYOUT ==================== */
.main-container {
    display: grid;
    grid-template-columns: 300px 1fr 300px;
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: var(--spacing-lg) auto;
    padding: 0 var(--spacing-lg);
}

/* Sidebar */
.sidebar {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    height: fit-content;
    box-shadow: var(--shadow);
    position: sticky;
    top: 80px;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 12px 15px;
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
}

.sidebar-menu a:hover {
    background-color: var(--light-color);
    text-decoration: none;
    transform: translateX(5px);
}

.sidebar-menu i {
    font-size: var(--font-xl);
    color: var(--primary-color);
    width: 24px;
    text-align: center;
}

.user-avatar-small {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
}

/* Feed */
.feed {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.create-post {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-color);
}

.post-input {
    flex: 1;
    background-color: var(--light-color);
    border: none;
    border-radius: 25px;
    padding: 12px 20px;
    font-size: var(--font-md);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    color: var(--text-secondary);
}

.post-input:hover {
    background-color: var(--gray-light);
    transform: translateY(-1px);
}

/* Posts */
.post {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.post:hover {
    box-shadow: var(--shadow-lg);
}

.post-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.post-user-info {
    flex: 1;
}

.post-user-name {
    font-weight: 600;
    color: var(--text-color);
    text-decoration: none;
    font-size: var(--font-md);
}

.post-user-name:hover {
    text-decoration: underline;
}

.post-time {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

.post-content {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    font-size: var(--font-md);
}

.post-media {
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.post-media img {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    transition: var(--transition);
}

.post-media img:hover {
    transform: scale(1.02);
}

.post-stats {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-sm) 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--font-sm);
}

.post-stats span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.post-action {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 10px;
    background: none;
    border: none;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.post-action:hover {
    background-color: var(--light-color);
    transform: translateY(-1px);
}

.post-action.liked {
    color: var(--primary-color);
}

.post-action.liked i {
    animation: likePop 0.3s ease;
}

@keyframes likePop {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* Right Sidebar */
.right-sidebar {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    height: fit-content;
    box-shadow: var(--shadow);
    position: sticky;
    top: 80px;
}

.sidebar-title {
    font-size: var(--font-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.sidebar-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background-color: var(--primary-color);
}

.friend-request {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.friend-request:hover {
    background-color: var(--light-color);
}

.friend-request img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.friend-request-info {
    flex: 1;
}

.friend-request-name {
    font-weight: 600;
    font-size: var(--font-sm);
    margin-bottom: var(--spacing-xs);
}

.friend-request-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.birthday-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
}

.birthday-item i {
    color: var(--warning-color);
    font-size: var(--font-lg);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.contact-item:hover {
    background-color: var(--light-color);
}

.contact-item img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.contact-item span {
    flex: 1;
    font-size: var(--font-sm);
    font-weight: 500;
}

.online-status {
    width: 10px;
    height: 10px;
    background-color: var(--success-color);
    border-radius: 50%;
    position: absolute;
    bottom: 8px;
    left: 30px;
    border: 2px solid var(--white);
}

/* ==================== NOTIFICATIONS ==================== */
.notification-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background-color: var(--error-color);
    color: white;
    font-size: var(--font-xs);
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
    font-weight: 600;
    display: none;
}

.notifications-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    width: 350px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
    max-height: 500px;
    overflow-y: auto;
}

.notifications-dropdown.show {
    display: block;
    animation: slideDown 0.3s ease;
}

.notification-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.notification-item:hover {
    background-color: var(--light-color);
}

.notification-item.unread {
    background-color: #e7f3ff;
}

.dark-theme .notification-item.unread {
    background-color: rgba(24, 119, 242, 0.2);
}

.notification-item img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.notification-content {
    flex: 1;
}

.notification-content p {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-sm);
    line-height: 1.4;
}

.notification-time {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

.no-notifications {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
}

/* ==================== COMMENTS SECTION ==================== */
.comments-section {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: none;
}

.comments-section.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.comments-list {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: var(--spacing-md);
    padding-right: var(--spacing-sm);
}

.comments-list::-webkit-scrollbar {
    width: 5px;
}

.comments-list::-webkit-scrollbar-track {
    background: var(--light-color);
    border-radius: 10px;
}

.comments-list::-webkit-scrollbar-thumb {
    background: var(--gray-color);
    border-radius: 10px;
}

.comment {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.comment-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.comment-content {
    flex: 1;
    background-color: var(--light-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 18px;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.comment-author {
    font-weight: 600;
    font-size: var(--font-sm);
    color: var(--text-color);
}

.comment-time {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

.comment-text {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-sm);
    line-height: 1.4;
}

.comment-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xs);
}

.comment-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-xs);
    cursor: pointer;
    padding: 0;
    transition: var(--transition);
}

.comment-actions button:hover {
    color: var(--primary-color);
}

.add-comment {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.comment-input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    background-color: var(--light-color);
    border-radius: 20px;
    padding: 5px 15px;
}

.comment-input {
    flex: 1;
    border: none;
    background: none;
    padding: 8px 0;
    outline: none;
    color: var(--text-color);
}

.comment-input::placeholder {
    color: var(--text-secondary);
}

.comment-submit {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 5px;
    font-size: var(--font-lg);
    transition: var(--transition);
}

.comment-submit:hover {
    transform: scale(1.1);
}

.no-comments {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-lg);
    font-style: italic;
}

/* ==================== MODALS ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background-color: var(--white);
    margin: 50px auto;
    padding: var(--spacing-lg);
    width: 90%;
    max-width: 550px;
    border-radius: var(--border-radius-lg);
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-color);
}

.close {
    font-size: var(--font-2xl);
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    line-height: 1;
}

.close:hover {
    color: var(--error-color);
    transform: rotate(90deg);
}

.modal-body {
    margin-bottom: var(--spacing-lg);
}

.modal-body textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    resize: vertical;
    margin-bottom: var(--spacing-md);
    background-color: var(--white);
    color: var(--text-color);
    font-family: inherit;
}

.modal-body input[type="file"] {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius);
    width: 100%;
    cursor: pointer;
}

.modal-body select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    background-color: var(--white);
    color: var(--text-color);
}

.modal-footer {
    text-align: right;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* Share Modal */
.share-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.share-options button {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: none;
    width: 100%;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
    font-size: var(--font-md);
}

.share-options button:hover {
    background-color: var(--light-color);
    transform: translateX(5px);
}

.share-options button i {
    color: var(--primary-color);
    font-size: var(--font-lg);
    width: 24px;
}

.share-external {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.share-external button {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    color: white;
    font-size: var(--font-lg);
}

.share-external button:hover {
    transform: scale(1.1) translateY(-2px);
}

.share-external button:nth-child(1) { background-color: #1877f2; }
.share-external button:nth-child(2) { background-color: #1da1f2; }
.share-external button:nth-child(3) { background-color: #0077b5; }
.share-external button:nth-child(4) { background-color: #25d366; }

/* ==================== IMAGE PREVIEW ==================== */
.image-preview {
    margin-top: var(--spacing-md);
    max-width: 100%;
    position: relative;
}

.image-preview img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.image-preview .remove-image {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--error-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.image-preview .remove-image:hover {
    background-color: #c82333;
    transform: scale(1.1);
}

/* ==================== LOADER ==================== */
.loader {
    text-align: center;
    padding: var(--spacing-lg);
}

.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.end-message {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    font-style: italic;
}

/* ==================== NEW POSTS BANNER ==================== */
.new-posts-banner {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-md);
    text-align: center;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    cursor: pointer;
    animation: pulse 2s infinite;
    box-shadow: var(--shadow);
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.new-posts-banner button {
    background: white;
    color: var(--primary-color);
    border: none;
    padding: 5px 20px;
    border-radius: 20px;
    margin-left: var(--spacing-sm);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.new-posts-banner button:hover {
    background: var(--light-color);
    transform: translateY(-1px);
}

/* ==================== EMOJI PICKER ==================== */
.emoji-picker-btn {
    position: relative;
}

.emoji-picker {
    position: absolute;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-xs);
    z-index: 100;
    bottom: 100%;
    left: 0;
    margin-bottom: 10px;
    animation: slideUp 0.3s ease;
}

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

.emoji-picker span {
    padding: var(--spacing-xs);
    text-align: center;
    cursor: pointer;
    font-size: var(--font-xl);
    transition: var(--transition);
    border-radius: var(--border-radius-sm);
}

.emoji-picker span:hover {
    background-color: var(--light-color);
    transform: scale(1.2);
}

/* ==================== TOAST NOTIFICATIONS ==================== */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    color: white;
    font-weight: 500;
    z-index: 3000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s;
    max-width: 350px;
    box-shadow: var(--shadow-lg);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-success {
    background: linear-gradient(135deg, var(--success-color), #34ce57);
}

.toast-error {
    background: linear-gradient(135deg, var(--error-color), #c82333);
}

.toast-info {
    background: linear-gradient(135deg, var(--primary-color), #0d6efd);
}

.toast-warning {
    background: linear-gradient(135deg, var(--warning-color), #e0a800);
}

/* ==================== SEARCH RESULTS ==================== */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    margin-top: var(--spacing-xs);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 1000;
}

.search-results.show {
    display: block;
    animation: slideDown 0.3s ease;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
}

.search-result-item:hover {
    background-color: var(--light-color);
    text-decoration: none;
}

.search-result-item img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.search-result-info {
    flex: 1;
}

.search-result-name {
    font-weight: 600;
    margin-bottom: 2px;
    font-size: var(--font-sm);
}

.search-result-type {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

.no-results {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

/* ==================== THEME TOGGLE ==================== */
.theme-toggle {
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--light-color);
    transform: rotate(15deg);
}

.theme-toggle i {
    font-size: var(--font-lg);
    color: var(--text-secondary);
}

/* ==================== PROFILE PAGE ==================== */
.profile-header {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.profile-cover {
    height: 350px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.profile-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info {
    padding: var(--spacing-lg);
    position: relative;
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-lg);
}

.profile-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid var(--white);
    margin-top: -75px;
    box-shadow: var(--shadow);
}

.profile-details {
    flex: 1;
}

.profile-name {
    font-size: var(--font-3xl);
    margin-bottom: var(--spacing-xs);
}

.profile-bio {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.profile-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: var(--font-xl);
    font-weight: 700;
    display: block;
}

.stat-label {
    color: var(--text-secondary);
    font-size: var(--font-sm);
}

.profile-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 1200px) {
    .main-container {
        grid-template-columns: 250px 1fr 250px;
    }
    
    .search-box {
        width: 200px;
    }
}

@media (max-width: 992px) {
    .main-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar,
    .right-sidebar {
        display: none;
    }
    
    .nav-center {
        display: none;
    }
    
    .nav-right {
        gap: var(--spacing-sm);
    }
    
    .search-box {
        width: 180px;
    }
}

@media (max-width: 768px) {
    .auth-box {
        padding: 30px 20px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .nav-left {
        gap: var(--spacing-sm);
    }
    
    .logo {
        font-size: var(--font-xl);
    }
    
    .search-box {
        display: none;
    }
    
    .nav-user span {
        display: none;
    }
    
    .profile-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .profile-avatar {
        margin-top: -100px;
    }
    
    .profile-stats {
        justify-content: center;
    }
    
    .profile-actions {
        width: 100%;
        justify-content: center;
    }
    
    .notifications-dropdown {
        width: 300px;
        right: -50px;
    }
}

@media (max-width: 480px) {
    .auth-box {
        padding: 20px;
    }
    
    .modal-content {
        margin: 20px;
        padding: var(--spacing-md);
    }
    
    .post-actions {
        flex-wrap: wrap;
    }
    
    .post-action {
        flex: auto;
        min-width: 100px;
    }
    
    .notifications-dropdown {
        width: 280px;
        right: -100px;
    }
}

/* ==================== PRINT STYLES ==================== */
@media print {
    .navbar,
    .sidebar,
    .right-sidebar,
    .post-actions,
    .create-post,
    .btn {
        display: none !important;
    }
    
    .main-container {
        grid-template-columns: 1fr;
    }
    
    .post {
        break-inside: avoid;
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ==================== ANIMATIONS ==================== */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.5s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.bounce {
    animation: bounce 0.5s ease;
}

/* ==================== INSTALL PAGE ==================== */
.install-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.install-container {
    max-width: 600px;
    width: 100%;
}

.install-box {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.install-header {
    text-align: center;
    margin-bottom: 30px;
}

.install-header h1 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 10px;
}

.install-header p {
    color: var(--text-secondary);
}

.install-progress {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    position: relative;
}

.install-progress::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--border-color);
    transform: translateY(-50%);
    z-index: 1;
}

.progress-step {
    position: relative;
    z-index: 2;
    background: var(--white);
    padding: 0 10px;
    text-align: center;
}

.step-number {
    width: 35px;
    height: 35px;
    background: var(--border-color);
    color: var(--text-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 5px;
    font-weight: 600;
    transition: var(--transition);
}

.progress-step.active .step-number {
    background: var(--primary-color);
    color: white;
}

.progress-step.completed .step-number {
    background: var(--success-color);
    color: white;
}

.step-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.progress-step.active .step-label {
    color: var(--primary-color);
    font-weight: 600;
}

.requirements-list {
    list-style: none;
    margin: 20px 0;
}

.requirements-list li {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.requirements-list li i {
    width: 20px;
}

.requirements-list .text-success i {
    color: var(--success-color);
}

.requirements-list .text-error i {
    color: var(--error-color);
}

.database-preview {
    background: var(--light-color);
    padding: 15px;
    border-radius: var(--border-radius);
    margin: 20px 0;
    overflow-x: auto;
}

.database-preview pre {
    margin: 0;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-color);
}

.final-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

/* ==================== LOADING STATES ==================== */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--border-color) 25%,
        var(--light-color) 50%,
        var(--border-color) 75%
    );
    background-size: 200% 100%;
    animation: skeleton 1.5s infinite;
}

@keyframes skeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}