/* =================================================
   TECHFEED THEME - DungThu.com
   Reddit-style Feed Layout with Shop Integration
   ================================================= */

/* ---- Google Font (Inter) ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ---- CSS Custom Properties ---- */
:root {
    --bg-body:      #f0f2f5;
    --bg-card:      #ffffff;
    --brand:        #ff4500;
    --brand-dark:   #d93b00;
    --primary:      #6c5ce7;
    --text-main:    #1c1c1c;
    --text-muted:   #787c7e;
    --border:       #edeff1;
    --hover-bg:     #f6f7f8;
    --radius-lg:    16px;
    --radius-md:    12px;
    --radius-sm:    8px;
    --shadow-sm:    0 1px 3px rgba(0,0,0,.08);
    --shadow-md:    0 4px 16px rgba(0,0,0,.10);
    --navbar-h:     56px;
}

/* ---- Base ---- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    overflow-y: scroll;
    padding-top: 0;
    padding-bottom: 64px; /* space for mobile bottom nav */
}

@media (min-width: 992px) {
    body { padding-bottom: 0; }
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar-techfeed {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 0;
    height: var(--navbar-h);
    z-index: 1030;
}

.navbar-techfeed .container-fluid {
    height: 100%;
}

/* Brand */
.navbar-techfeed .navbar-brand {
    color: var(--text-main) !important;
    font-weight: 800;
    font-size: 1.3rem;
    gap: 8px;
    text-decoration: none;
}

.brand-icon {
    width: 32px;
    height: 32px;
    background-color: var(--brand);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.brand-dot { color: var(--text-muted); font-weight: 500; }

/* Search Bar */
.search-bar-wrap {
    width: 100%;
    max-width: 560px;
}

.search-bar-inner {
    background-color: #f6f7f8;
    border: 1.5px solid transparent;
    border-radius: 24px;
    padding: 0 16px;
    height: 40px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s;
    width: 100%;
}

.search-bar-inner:hover,
.search-bar-inner:focus-within {
    background-color: #fff;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(255,69,0,.08);
}

.search-icon { color: var(--text-muted); font-size: 0.9rem; flex-shrink: 0; }

.search-input {
    border: none;
    background: transparent;
    outline: none;
    width: 100%;
    font-size: 0.92rem;
    color: var(--text-main);
}

.search-input::placeholder { color: var(--text-muted); }

/* Nav Icon Buttons */
.nav-icon-btn {
    width: 38px;
    height: 38px;
    background: #f6f7f8;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
    flex-shrink: 0;
}

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

.nav-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--brand);
    color: #fff;
    border-radius: 50%;
    width: 17px;
    height: 17px;
    font-size: 0.65rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Shop Button */
.btn-shop {
    background-color: var(--hover-bg);
    border: 1.5px solid var(--border);
    border-radius: 24px;
    padding: 6px 16px;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.88rem;
    text-decoration: none;
    gap: 6px;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn-shop:hover {
    background-color: #eaedef;
    color: var(--text-main);
    border-color: #b0b8bf;
}

/* Login Button */
.btn-login {
    background: var(--brand);
    color: #fff !important;
    border-radius: 24px;
    padding: 7px 18px;
    font-weight: 700;
    font-size: 0.88rem;
    text-decoration: none;
    transition: background 0.2s;
    white-space: nowrap;
}

.btn-login:hover { background: var(--brand-dark); }

/* User Avatar Button */
.user-avatar-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand) 0%, #ff6a35 100%);
    border: none;
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.shadow-techfeed {
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
}

/* Mobile Navbar Tweaks */
@media (max-width: 576px) {
    .navbar-brand span { font-size: 1.15rem !important; }
    .brand-icon { width: 28px !important; height: 28px !important; font-size: 0.9rem !important; }
    .btn-login { padding: 5px 12px !important; font-size: 0.82rem !important; margin-left: 5px; }
    .nav-icon-btn { width: 34px !important; height: 34px !important; font-size: 0.9rem !important; }
    .navbar-techfeed .container-fluid { padding-left: 8px !important; padding-right: 8px !important; }
}

/* ============================================
   MOBILE BOTTOM NAV
   ============================================ */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: stretch;
    z-index: 1025;
    box-shadow: 0 -2px 12px rgba(0,0,0,.08);
}

.mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.65rem;
    font-weight: 600;
    gap: 3px;
    position: relative;
    transition: color 0.2s;
}

.mobile-nav-item i { font-size: 1.1rem; }

.mobile-nav-item.active,
.mobile-nav-item:hover { color: var(--brand); }

/* ============================================
   MAIN LAYOUT — 3 COLUMNS
   ============================================ */
.feed-layout {
    display: grid;
    gap: 20px;
    padding: 20px 0;
    max-width: 1280px;
    margin: 0 auto;
    padding: 20px 16px;
}

@media (min-width: 1024px) {
    .feed-layout {
        grid-template-columns: 220px 1fr 300px;
        padding: 20px 24px;
    }
}

@media (min-width: 1280px) {
    .feed-layout {
        grid-template-columns: 240px 1fr 320px;
    }
}

/* Sticky Sidebar */
.sticky-col {
    position: sticky;
    top: calc(var(--navbar-h) + 10px);
    max-height: calc(100vh - var(--navbar-h) - 20px);
    overflow-y: auto;
    scrollbar-width: none;
}

.sticky-col::-webkit-scrollbar { display: none; }

/* ============================================
   LEFT SIDEBAR MENU
   ============================================ */
.sidebar-section-label {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    padding: 0 10px;
    margin-bottom: 4px;
    margin-top: 14px;
}

.sidebar-section-label:first-child { margin-top: 0; }

.side-menu-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    color: var(--text-main);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: background 0.15s;
    margin-bottom: 2px;
}

.side-menu-link:hover,
.side-menu-link.active { background-color: var(--hover-bg); color: var(--text-main); }

.side-menu-link.active { font-weight: 700; }

.side-menu-link i {
    width: 20px;
    font-size: 1rem;
    text-align: center;
    color: var(--text-muted);
}

.side-menu-link.active i,
.side-menu-link:hover i { color: var(--brand); }

/* ============================================
   FEED SORT TABS
   ============================================ */
.feed-sort-bar {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    margin-bottom: 14px;
    display: flex;
    gap: 6px;
}

.sort-btn {
    background: none;
    border: none;
    border-radius: 24px;
    padding: 6px 14px;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s;
}

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

/* ============================================
   FEED CARD (Blog Post / Article)
   ============================================ */
.feed-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    transition: border-color 0.15s;
    display: flex;
    overflow: hidden;
}

.feed-card:hover { border-color: #a3abaf; }

/* Vote Column */
.vote-col {
    background-color: #f8f9fa;
    width: 44px;
    flex-shrink: 0;
    padding: 10px 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.vote-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    border-radius: 4px;
    padding: 4px 6px;
    transition: all 0.15s;
    line-height: 1;
}

.vote-btn:hover { background-color: #e9ecef; color: var(--brand); }
.vote-btn.voted-up { color: var(--brand); }
.vote-btn.voted-down { color: #7193ff; }

.vote-count {
    font-weight: 800;
    font-size: 0.8rem;
    color: var(--text-main);
    text-align: center;
}

/* Post Content */
.post-body {
    padding: 10px 12px;
    flex: 1;
    min-width: 0;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    flex-wrap: wrap;
}

.post-meta img {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    object-fit: cover;
}

.post-category {
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
}

.post-category:hover { text-decoration: underline; color: var(--text-main); }

.post-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    display: block;
    line-height: 1.4;
    margin-bottom: 10px;
}

.post-title:hover { color: var(--brand); }

.post-excerpt {
    font-size: 0.88rem;
    color: #4a4a4a;
    margin-bottom: 10px;
    line-height: 1.5;
}

/* Media */
.post-media {
    width: 100%;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: #eee;
    margin-bottom: 10px;
}

.post-media img {
    width: 100%;
    max-height: 380px;
    object-fit: cover;
    display: block;
}

/* Action Bar */
.post-actions {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-weight: 700;
    font-size: 0.78rem;
    padding: 5px 10px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s;
}

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

/* ============================================
   SHOP CARD IN FEED
   ============================================ */
.shop-feed-card {
    border-color: #b2ebf2;
}

.shop-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: #e0f7fa;
    color: #00838f;
    padding: 2px 8px;
    border-radius: 24px;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.shop-badge.flash { background: #fff3e0; color: #e65100; }

.vote-col-shop { background-color: #e0f7fa; }

.product-price-feed {
    font-size: 1.25rem;
    font-weight: 800;
    color: #e53935;
}

.product-price-original {
    font-size: 0.88rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

.btn-add-cart-feed {
    background: #e53935;
    color: #fff;
    border: none;
    border-radius: 24px;
    padding: 8px 16px;
    font-weight: 700;
    font-size: 0.85rem;
    width: 100%;
    cursor: pointer;
    transition: background 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-add-cart-feed:hover { background: #c62828; }

/* ============================================
   AD SLOT
   ============================================ */
.ad-slot {
    background: #f8f9fa;
    border: 1px dashed #ced4da;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #adb5bd;
    font-size: 0.82rem;
    text-align: center;
    margin-bottom: 12px;
    overflow: hidden;
}

.ad-slot-infeed { height: 120px; }
.ad-slot-sidebar { height: 280px; }

/* ============================================
   RIGHT SIDEBAR WIDGETS
   ============================================ */
.widget-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    margin-bottom: 14px;
}

.widget-title {
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.stat-block .stat-number {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-main);
}

.community-btn {
    background: var(--text-main);
    color: #fff;
    border: none;
    border-radius: 24px;
    width: 100%;
    padding: 8px;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 12px;
    text-decoration: none;
    display: block;
    text-align: center;
}

.community-btn:hover { background: #333; color: #fff; }

/* Trending product list */
.trending-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.trending-item:last-child { margin-bottom: 0; }

.trending-item img {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.trending-item .item-name {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.3;
}

.trending-item .item-name:hover { color: var(--brand); }

.trending-item .item-price {
    font-size: 0.82rem;
    font-weight: 700;
    color: #e53935;
}

/* ============================================
   FOOTER — TECHFEED STYLE
   ============================================ */
.footer-techfeed {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 32px 0 24px;
    margin-top: 24px;
}

.footer-brand {
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--brand);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li { margin-bottom: 6px; }

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.88rem;
    transition: color 0.15s;
}

.footer-links a:hover { color: var(--text-main); }

.footer-copy {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    padding-top: 20px;
    margin-top: 20px;
    border-top: 1px solid var(--border);
}

/* ============================================
   SECTION CARD HEADING
   ============================================ */
.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.section-heading h2 {
    font-size: 1rem;
    font-weight: 800;
    margin: 0;
}

.section-heading a {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--brand);
    text-decoration: none;
}

.section-heading a:hover { text-decoration: underline; }

/* ============================================
   BLOG CARD (standalone)
   ============================================ */
.blog-list-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 12px;
    display: flex;
    gap: 12px;
    padding: 12px;
    transition: border-color 0.15s;
}

.blog-list-card:hover { border-color: #a3abaf; }

.blog-list-card img {
    width: 90px;
    height: 70px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.blog-list-card .blog-title {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.blog-list-card .blog-title:hover { color: var(--brand); }

.blog-list-card .blog-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ============================================
   PRODUCT CARD (compact grid)
   ============================================ */
.product-compact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.15s;
}

.product-compact-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: #a3abaf;
}

.product-compact-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
}

.product-compact-card .pc-body {
    padding: 10px 12px 12px;
}

.product-compact-card .pc-title {
    font-size: 0.88rem;
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-main);
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.product-compact-card .pc-title:hover { color: var(--brand); }

.product-compact-card .pc-price {
    font-size: 1rem;
    font-weight: 800;
    color: #e53935;
}

.product-compact-card .pc-original {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

/* ============================================
   FLASH SALE SECTION HEADER
   ============================================ */
.flash-sale-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: linear-gradient(135deg,rgba(255,69,0,.08),rgba(255,120,60,.06));
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border: 1px solid rgba(255,69,0,.15);
    border-bottom: none;
    margin-bottom: 0;
}

.flash-sale-products {
    border: 1px solid rgba(255,69,0,.15);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    padding: 12px;
    background: var(--bg-card);
    margin-bottom: 14px;
}

/* Timer Pills */
.timer-pills {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-weight: 800;
    font-size: 0.8rem;
}

.timer-pill {
    background: var(--text-main);
    color: #fff;
    padding: 2px 7px;
    border-radius: 6px;
    font-variant-numeric: tabular-nums;
    min-width: 26px;
    text-align: center;
}

.timer-sep { color: #9ca3af; font-weight: 900; }

/* ============================================
   CATEGORY FILTER BAR
   ============================================ */
.category-scroll-bar {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 10px 0;
    margin-bottom: 14px;
    scrollbar-width: none;
}

.category-scroll-bar::-webkit-scrollbar { display: none; }

.cat-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 24px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.82rem;
    text-decoration: none;
    white-space: nowrap;
    transition: all 0.15s;
    cursor: pointer;
}

.cat-pill:hover,
.cat-pill.active {
    border-color: var(--brand);
    color: var(--brand);
    background: #fff5f2;
}

/* ============================================
   HERO SECTION (minimal for TechFeed)
   ============================================ */
.hero-techfeed {
    background: linear-gradient(135deg, #1c1c28 0%, #2d2d42 100%);
    color: #fff;
    padding: 40px 0 32px;
    margin-bottom: 0;
}

.hero-techfeed h1 {
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1.25;
}

@media (max-width: 768px) {
    .hero-techfeed h1 { font-size: 1.3rem; }
    .hero-techfeed { padding: 28px 0 22px; }
}

/* ============================================
   SWIPE-AWAY ON MOBILE (cards)
   ============================================ */
@media (max-width: 991.98px) {
    .feed-layout {
        grid-template-columns: 1fr;
        padding: 12px 10px;
        gap: 0;
    }
    
    .sidebar-left, .sidebar-right { display: none; }
    
    .feed-card { border-radius: var(--radius-sm); }
    
    .post-title { font-size: 1rem; }
    
    .vote-col { display: none; }

    .post-body { padding: 10px; }
}

/* ============================================
   PRODUCT GRID (home)
   ============================================ */
.product-grid-techfeed {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

@media (min-width: 768px) {
    .product-grid-techfeed {
        grid-template-columns: repeat(4, 1fr);
        gap: 14px;
    }
}

/* ============================================
   UTILITY
   ============================================ */
.text-brand { color: var(--brand); }
.bg-brand { background: var(--brand); }
.rounded-techfeed { border-radius: var(--radius-md); }

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-1 {
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Override bootstrap primary color */
.text-primary { color: var(--brand) !important; }
.bg-primary { background-color: var(--brand) !important; }
.btn-primary {
    background-color: var(--brand);
    border-color: var(--brand);
}
.btn-primary:hover {
    background-color: var(--brand-dark);
    border-color: var(--brand-dark);
}
.btn-outline-primary {
    color: var(--brand);
    border-color: var(--brand);
}
.btn-outline-primary:hover {
    background-color: var(--brand);
    border-color: var(--brand);
}

/* ============================================
   GLOBAL PRELOADER
   ============================================ */
.tf-preloader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: #fff; display: flex; align-items: center; justify-content: center;
    z-index: 9999; 
    visibility: visible;
    opacity: 1;
    transition: opacity .4s ease, visibility .1s ease-in .4s;
    overflow: hidden;
}

.tf-preloader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-logo {
    font-size: 3.5rem;
    color: #ff4500; /* Màu cam thương hiệu */
    animation: pulsate 1s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    margin-bottom: 20px;
    display: block;
}

.loader-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 69, 0, 0.1);
    border-top-color: #ff4500;
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 0.8s linear infinite;
}

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

@keyframes pulsate {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(1); opacity: 0.8; }
}

body.loading {
    overflow: hidden;
}