/* ========== Base Styles & Variables ========== */
:root {
    /* Color Scheme - Modern & Professional */
    --primary-color: #4e73df;
    --primary-dark: #2e59d9;
    --primary-light: #bac8f3;
    --secondary-color: #f8f9fc;
    --dark-color: #5a5c69;
    --light-color: #f8f9fc;
    --success-color: #1cc88a;
    --danger-color: #e74a3b;
    --warning-color: #f6c23e;
    --info-color: #36b9cc;

    /* Neutrals */
    --gray-100: #f8f9fc;
    --gray-200: #eaecf4;
    --gray-300: #dddfeb;
    --gray-400: #d1d3e2;
    --gray-500: #b7b9cc;
    --gray-600: #858796;
    --gray-700: #6e707e;
    --gray-800: #5a5c69;
    --gray-900: #3a3b45;

    /* Typography */
    --body-font: 'Nunito', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --heading-font: 'Nunito', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

    /* Spacing System */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* UI Elements */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.8rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Box Shadows - Premium feel */
    --box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.05);
    --box-shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.15);
}

/* ========== Global Resets ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--body-font);
    background-color: var(--secondary-color);
    color: var(--gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button,
.btn {
    cursor: pointer;
    font-family: var(--body-font);
    border: none;
    transition: var(--transition);
}

input,
select,
textarea {
    font-family: var(--body-font);
    font-size: 1rem;
    outline: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hide {
    display: none !important;
}

/* ========== Header & Navigation ========== */
.main-header {
    background-color: #fff;
    box-shadow: var(--box-shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo a {
    color: var(--primary-color);
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-md);
}

.main-nav a {
    display: flex;
    align-items: center;
    color: var(--gray-600);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.main-nav a i {
    margin-right: var(--spacing-xs);
    font-size: 1.1rem;
}

.main-nav a.active,
.main-nav a:hover {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

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

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: 700;
    text-align: center;
    display: inline-block;
}

.btn-login {
    color: var(--primary-color);
    background-color: transparent;
    border: 2px solid var(--primary-color);
}

.btn-login:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-register {
    background-color: var(--primary-color);
    color: #fff;
}

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

.btn-create-post {
    background-color: var(--success-color);
    color: white;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-create-post:hover {
    background-color: #18a172;
    transform: translateY(-1px);
}

/* Profile Menu */
.avatar-small {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--gray-200);
}

.user-profile-menu {
    position: relative;
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background-color: #fff;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-lg);
    width: 220px;
    overflow: hidden;
    display: none;
    animation: fadeIn 0.2s ease-out;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.user-profile-menu:hover .dropdown-menu,
.post-actions-menu:hover .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 0.8rem 1.2rem;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
    font-weight: 600;
}

.dropdown-menu a:last-child {
    border-bottom: none;
}

.dropdown-menu a:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.dropdown-menu a i {
    margin-right: var(--spacing-sm);
    width: 20px;
    text-align: center;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: transparent;
    border: none;
}

.mobile-menu-toggle .bar {
    width: 28px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition);
}

/* ========== Content Layout ========== */
.main-content {
    padding: var(--spacing-xl) 0;
}

.content-grid {
    display: grid;
    grid-template-columns: 240px 1fr 300px;
    gap: var(--spacing-xl);
}

/* ========== Sidebar Components ========== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.widget {
    background-color: #fff;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow-sm);
    border: 1px solid var(--gray-200);
}

.widget h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--gray-800);
    border-bottom: 2px solid var(--gray-100);
    padding-bottom: var(--spacing-sm);
}

.categories-widget a {
    display: flex;
    align-items: center;
    color: var(--gray-700);
    padding: 0.6rem var(--spacing-sm);
    border-radius: var(--border-radius-md);
    font-weight: 600;
}

.categories-widget a i {
    margin-right: var(--spacing-sm);
    width: 20px;
    color: var(--primary-color);
}

.categories-widget a:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.trending-topics a {
    display: flex;
    justify-content: space-between;
    padding: 0.6rem var(--spacing-sm);
    border-radius: var(--border-radius-md);
}

.trending-topics a:hover {
    background-color: var(--gray-100);
}

.topic-tag {
    font-weight: 700;
    color: var(--primary-color);
}

.post-count {
    font-size: 0.8rem;
    color: var(--gray-500);
}

.user-suggestion {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-100);
}

.user-suggestion:last-child {
    border-bottom: none;
}

.user-info {
    flex: 1;
    margin-left: var(--spacing-sm);
}

.user-name {
    display: block;
    font-weight: 700;
    color: var(--gray-800);
    font-size: 0.95rem;
}

.user-meta {
    font-size: 0.8rem;
    color: var(--gray-600);
}

.follow-btn {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    border-radius: var(--border-radius-sm);
    padding: 0.3rem 0.8rem;
    font-size: 0.8rem;
    font-weight: 700;
}

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

/* ========== Post Feed ========== */
.post-feed {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.feed-filter {
    background-color: #fff;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: var(--box-shadow-sm);
    border: 1px solid var(--gray-200);
}

.filter-options {
    display: flex;
    gap: var(--spacing-sm);
}

.filter-options button {
    background: none;
    color: var(--gray-600);
    font-weight: 700;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-md);
}

.filter-options button.active {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

.filter-options button:hover:not(.active) {
    background-color: var(--gray-50);
}

.post {
    background-color: #fff;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-sm);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

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

.post-header img {
    border: 1px solid var(--gray-200);
}

.post-info {
    flex: 1;
    margin-left: var(--spacing-sm);
}

.author-name {
    font-weight: 700;
    color: var(--gray-900);
}

.verified-badge i {
    color: var(--primary-color);
    font-size: 0.85rem;
}

.post-meta {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.post-content {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

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

.post-image {
    width: 100%;
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-sm);
}

/* Post Reactions */
.post-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--gray-100);
    background-color: var(--gray-50);
}

.post-reactions {
    display: flex;
    gap: var(--spacing-xl);
}

.reaction-btn {
    background: none;
    color: var(--gray-600);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.reaction-btn:hover {
    color: var(--primary-color);
}

.reaction-btn i {
    font-size: 1.1rem;
}

.like-btn i.fas {
    color: var(--danger-color);
}

/* Comments */
.comments-section {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--gray-100);
    background-color: #fff;
}

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

.comment-content {
    flex: 1;
    margin-left: var(--spacing-sm);
    background-color: var(--gray-100);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) var(--border-radius-md);
}

.commenter-name {
    font-weight: 700;
    font-size: 0.9rem;
}

.comment-time {
    font-size: 0.75rem;
    color: var(--gray-500);
}

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

.comment-input {
    flex: 1;
    border: 2px solid var(--gray-200);
    border-radius: 20px;
    padding: 0.5rem 1.2rem;
    transition: var(--transition);
}

.comment-input:focus {
    border-color: var(--primary-color);
}

/* ========== Footer ========== */
.main-footer {
    background-color: var(--gray-900);
    color: #fff;
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.footer-column h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-lg);
}

.footer-column ul li {
    margin-bottom: 0.8rem;
}

.footer-column a {
    color: var(--gray-400);
}

.footer-column a:hover {
    color: #fff;
}

.copyright {
    text-align: center;
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-800);
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* ========== Components ========== */
.notification-toast {
    position: fixed;
    bottom: 25px;
    right: 25px;
    background: #fff;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-lg);
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 9999;
    transform: translateX(120%);
    transition: var(--transition);
}

.notification-toast.show {
    transform: translateX(0);
}

.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.1);
    padding: 10px;
    justify-content: space-around;
    z-index: 1000;
}

.mobile-bottom-nav a {
    font-size: 1.4rem;
    color: var(--gray-500);
}

.mobile-bottom-nav a.active {
    color: var(--primary-color);
}

/* ========== RESPONSIVE STYLES ========== */

/* Tablets & Small Desktops */
@media screen and (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 80px 1fr 280px;
    }

    .main-nav span,
    .btn-create-post span {
        display: none;
    }

    .main-nav a i {
        margin-right: 0;
        font-size: 1.4rem;
    }
}

/* Medium Tablets */
@media screen and (max-width: 900px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .main-nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-active .main-nav {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #fff;
        box-shadow: var(--box-shadow-md);
        padding: 1rem;
    }

    .mobile-menu-active .main-nav ul {
        flex-direction: column;
    }

    .mobile-menu-active .main-nav a span {
        display: block;
    }

    .mobile-bottom-nav {
        display: flex;
    }

    .main-content {
        margin-bottom: 60px;
    }
}

/* Mobile Devices */
@media screen and (max-width: 600px) {
    .content-grid {
        gap: var(--spacing-md);
    }

    .main-header .container {
        padding: var(--spacing-sm);
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .post-reactions {
        justify-content: space-between;
        gap: 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {

    .main-header,
    .main-footer,
    .sidebar,
    .mobile-bottom-nav,
    .reaction-btn,
    .comment-form {
        display: none !important;
    }

    body {
        background: #fff;
    }

    .container {
        max-width: none;
    }

    .content-grid {
        display: block;
    }
}