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

body {
    background: #f2f2f2;
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
    overflow: hidden;
}

.app {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ================= TABS ================= */

.tabs {
    display: flex;
    justify-content: center;
    padding: 20px 0 10px;
    gap: 40px;
}

.tab {
    font-size: 20px;
    font-weight: bold;
    color: gray;
    cursor: pointer;
    position: relative;
}

.tab.active {
    color: black;
}

.tab.active::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 3px;
    background: black;
    border-radius: 5px;
}

.meme-box {
    width: 90%;
    max-width: 500px;
    height: 65vh;
    margin-top: 20px;
    border-radius: 30px;
    border: 3px solid #bdbdbd;
    overflow: hidden;
    position: relative;
    background: #fff;
    position: relative;
}

/* ================= MEME BOX ================= */



/* Slider full box */
.slider {
    height: 100%;
    width: 100%;
    transition: transform 300ms ease;
}

/* Mỗi slide full meme-box */
.slide {
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* Ảnh luôn centered */
.slide img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    /* border-radius: 20px;
    border: 2px solid #bdbdbd; */
}

/* Locked */

.locked img {
    filter: blur(25px);
}

.lock-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.6);
    color: white;
    font-weight: bold;
    font-size: 18px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 20px;
}

/* ================= GUIDE ================= */

.scroll-guide {
    position: absolute;
    bottom: 30px;
    left: 0;
    width: 100%;
    text-align: center;
    color: red;
    font-weight: bold;
    opacity: 1;
    z-index: 20;
    pointer-events: none; /* không cản swipe */
}


.arrow {
    font-size: 44px;
    color: red;
    animation: bounce 1.2s infinite;
}


@keyframes bounce {
    0% { transform: translateY(0); }
    50% { transform: translateY(8px); }
    100% { transform: translateY(0); }
}

/* ================= DESKTOP NAV ================= */

.desktop-nav {
    position: absolute;
    right: calc(47% - 300px);
    top: 47%;
    transform: translateY(-50%);
    display: none;
    flex-direction: column;
    gap: 20px;
}

.nav-btn {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    border: none;
    font-size: 26px;
    font-weight: bold;
    cursor: pointer;
    background: white;
    border: 2px solid #bdbdbd;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: #f0f0f0;
    transform: scale(1.05);
}

/* Chỉ hiển thị trên desktop thực sự */
@media (hover: hover) and (pointer: fine) {
    .desktop-nav {
        display: flex;
    }
}

/* ================= LOAD MORE ================= */

.load-more-btn {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    background: red;
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    z-index: 30;
    animation: floatBtn 2.2s ease-in-out infinite;
    box-shadow: 0 6px 18px rgba(0,0,0,0.25);
    transition: background 0.2s ease, transform 0.2s ease;
}

.load-more-btn:hover {
    background: #cc0000;
    transform: translateX(-50%) scale(1.05);
}

/* Floating effect */
@keyframes floatBtn {
    0%   { transform: translate(-50%, 0); }
    50%  { transform: translate(-50%, -6px); }
    100% { transform: translate(-50%, 0); }
}