/* --- style.css --- */

:root {
    --bg-color: #050505;
    --nav-bg: #0f1115;
    --nav-active-bg: #000000;
    --text-color: #ffffff;       
    --accent-color: #ffcc00;     
    --gray-text: #a1a1aa;        
    --card-bg: #111111;
    --card-border: rgba(255, 255, 255, 0.05);
    --shadow: rgba(0,0,0,0.8);
    --download-btn-bg: #3f424b;
    --download-btn-text: #ffffff;
    --hover-bg: rgba(255,255,255,0.05);
}

body.light-mode {
    --bg-color: #ffffff;          
    --nav-bg: #ffffff;            
    --nav-active-bg: #eeeeee;     
    --text-color: #000000;        
    --accent-color: #fc9905;      
    --gray-text: #000000;         
    --card-bg: #868585;           
    --card-border: #000000;       
    --shadow: rgba(0,0,0,0.15);   
    --download-btn-bg: #000000;   
    --download-btn-text: #ffffff; 
    --hover-bg: rgba(0,0,0,0.05); 
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; outline: none; }
html { overflow-y: scroll; }
body { 
    background-color: var(--bg-color); 
    color: var(--text-color); 
    display: flex; flex-direction: column; align-items: center; 
    min-height: 100vh; padding-bottom: 50px; 
    transition: background-color 0.3s, color 0.3s; 
}

nav { 
    position: fixed; top: 20px; left: 50%; transform: translateX(-50%); z-index: 1000; 
    width: auto; min-width: 900px; max-width: 95%; height: 70px; padding: 0 20px;
    background-color: var(--nav-bg); border-radius: 50px; 
    display: flex; align-items: center; justify-content: space-between; 
    box-shadow: 0 10px 40px var(--shadow); 
    border: 1px solid var(--card-border); 
    backdrop-filter: blur(10px); 
    transition: 0.3s; 
}
.nav-left { display: flex; align-items: center; margin-right: 15px; }
.logo-circle { 
    width: 40px; height: 40px; 
    background-color: var(--text-color); 
    color: var(--bg-color);              
    border: 1px solid var(--card-border);
    border-radius: 50%; display: flex; justify-content: center; align-items: center; 
    font-weight: 900; font-size: 20px; 
    cursor: pointer; user-select: none; transition: 0.3s; flex-shrink: 0;
}
.logo-circle:hover { transform: scale(1.1); }
.nav-container { 
    display: flex; align-items: center; gap: 5px; 
    flex: 1; overflow-x: auto; white-space: nowrap; padding: 0 10px; 
    scrollbar-width: none; -ms-overflow-style: none;
}
.nav-container::-webkit-scrollbar { display: none; }
.nav-item { 
    cursor: pointer; transition: 0.3s; padding: 10px 15px; border-radius: 30px; 
    font-size: 13px; font-weight: 600; 
    color: var(--gray-text); 
    text-decoration: none; display: flex; align-items: center; gap: 5px; 
    white-space: nowrap; flex-shrink: 0;
}
.nav-item:hover { color: var(--text-color); background-color: var(--hover-bg); }
.nav-item.active { background-color: var(--nav-active-bg); color: var(--text-color); font-weight: 700; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
.arrow-down { width: 0; height: 0; border-left: 4px solid transparent; border-right: 4px solid transparent; border-top: 4px solid currentColor; opacity: 0.7; margin-top: 2px; }
.nav-right { display: flex; align-items: center; margin-left: 15px; flex-shrink: 0; }
.user-icon { width: 40px; height: 40px; border: 1px solid var(--gray-text); border-radius: 50%; display: flex; justify-content: center; align-items: center; cursor: pointer; transition: 0.3s; overflow: hidden; }
.user-icon:hover { border-color: var(--text-color); background-color: var(--hover-bg); }
.user-icon svg { width: 20px; height: 20px; fill: var(--text-color); }

.container { width: 98%; max-width: none; padding: 0 10px; display: flex; flex-direction: column; margin-top: 130px; }
.header-section { position: relative; text-align: center; margin-bottom: 40px; }
.back-btn { 
    position: absolute; left: 0; top: 50%; transform: translateY(-50%); 
    border: 1px solid var(--gray-text); padding: 8px 16px; border-radius: 4px; 
    font-size: 12px; color: var(--gray-text); text-decoration: none; transition: 0.3s; font-weight: 500;
}
.back-btn:hover { border-color: var(--accent-color); color: var(--accent-color); }
.main-title { font-size: 40px; font-weight: 900; letter-spacing: 2px; color: var(--text-color); }
.main-title span { color: var(--accent-color); text-shadow: 0 0 20px rgba(255, 204, 0, 0.3); }

.category-tabs { display: flex; justify-content: flex-start; gap: 40px; margin-bottom: 20px; border-bottom: 2px solid var(--card-border); padding-bottom: 10px; width: 100%; }
.tab-btn { 
    background: none; border: none; 
    color: var(--gray-text); 
    font-size: 18px; font-weight: 800; text-transform: uppercase; 
    cursor: pointer; position: relative; transition: 0.3s; padding: 5px 0; 
}
.tab-btn:hover, .tab-btn.active { color: var(--text-color); }
.tab-btn.active::after { content: ''; position: absolute; bottom: -12px; left: 0; width: 100%; height: 4px; background-color: var(--accent-color); box-shadow: 0 -2px 15px rgba(255, 204, 0, 0.8); border-radius: 2px 2px 0 0; }

.controls-container { display: flex; justify-content: space-between; align-items: center; width: 100%; margin-bottom: 30px; }
.filters { display: flex; gap: 12px; flex-wrap: wrap; }
.filter-pill { 
    padding: 8px 20px; border-radius: 100px; 
    background-color: transparent; 
    color: var(--gray-text); 
    font-size: 13px; font-weight: 500; 
    cursor: pointer; transition: 0.3s; 
    border: 1px solid var(--card-border); 
}
.filter-pill:hover { border-color: var(--accent-color); color: var(--text-color); transform: translateY(-2px); background-color: var(--hover-bg); }
.filter-pill.active { background-color: var(--accent-color); color: #000; font-weight: 700; border-color: var(--accent-color); box-shadow: 0 0 15px rgba(255, 204, 0, 0.4); }

.download-btn { 
    background-color: var(--download-btn-bg); 
    color: var(--download-btn-text); 
    padding: 12px 28px; border-radius: 100px; font-weight: bold; font-size: 13px; 
    cursor: pointer; transition: 0.3s; border: none; text-decoration: none; display: inline-block; 
}
.download-btn:hover {
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.8), 
                0 0 30px rgba(255, 255, 255, 0.4);
    opacity: 1;
    transition: box-shadow 0.3s ease;
}

.grid { 
    display: grid; 
    grid-template-columns: repeat(5, 1fr); 
    gap: 25px; 
    width: 100%; margin-bottom: 50px; 
    min-height: 800px; 
}
.card { 
    background: var(--card-bg); 
    border-radius: 12px; aspect-ratio: 16/9; position: relative; 
    border: 1px solid var(--card-border); 
    cursor: pointer; opacity: 0; 
    animation: popIn 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; 
    transition: all 0.4s; 
    box-shadow: 0 4px 10px var(--shadow); 
    overflow: hidden; 
}
.card-label { 
    position: absolute; top: 15px; left: 15px; 
    font-size: 12px; color: var(--gray-text); font-weight: 700; z-index: 2; transition: color 0.3s; 
}
.card:hover { transform: translateY(-8px) scale(1.02); border-color: var(--accent-color); box-shadow: 0 20px 30px rgba(0,0,0,0.1), 0 0 15px rgba(255, 204, 0, 0.15); }
.card:hover .card-label { color: var(--accent-color); text-shadow: 0 0 5px rgba(255, 204, 0, 0.5); }
@keyframes popIn { from { opacity: 0; transform: scale(0.8) translateY(20px); } to { opacity: 1; transform: scale(1) translateY(0); } }

.pagination { display: flex; gap: 10px; align-self: center; }
.page-btn { 
    width: 40px; height: 40px; display: flex; justify-content: center; align-items: center; 
    background: var(--card-bg); border-radius: 8px; cursor: pointer; transition: 0.3s; 
    border: 1px solid var(--card-border); color: var(--gray-text); font-weight: 500;
}
.page-btn:hover, .page-btn.active { background: var(--accent-color); color: black; font-weight: bold; border-color: var(--accent-color); box-shadow: 0 0 10px rgba(255, 204, 0, 0.4); transform: translateY(-2px); }

/* MEDIA QUERIES GỐC (GIỮ NGUYÊN) */
@media (max-width: 1200px) { .grid { grid-template-columns: repeat(4, 1fr); } nav { min-width: auto; width: 95%; } }
@media (max-width: 900px) { 
    .grid { grid-template-columns: repeat(3, 1fr); } 
    nav { height: auto; flex-direction: column; padding: 15px; border-radius: 20px; } 
    .nav-container { justify-content: flex-start; width: 100%; overflow-x: auto; margin: 10px 0; } 
    .container { margin-top: 170px; } 
}
@media (max-width: 600px) { .grid { grid-template-columns: repeat(2, 1fr); } .controls-container { flex-direction: column; align-items: flex-start; gap: 15px; } .download-btn { width: 100%; text-align:center; } }

/* 1. TRANG CHỦ (Home Section) */
.home-container {
    height: 100vh; display: flex; flex-direction: column; 
    justify-content: center; align-items: center; text-align: center;
    animation: fadeIn 0.8s ease;
}
.home-title { font-size: 60px; font-weight: 900; line-height: 1.2; margin-bottom: 20px; color: var(--text-color); }
.home-title span { color: var(--accent-color); text-shadow: 0 0 30px rgba(255, 204, 0, 0.3); }
.home-subtitle { font-size: 18px; color: var(--gray-text); margin-bottom: 40px; }

.explore-btn {
    padding: 15px 50px; font-size: 18px; font-weight: bold;
    background: var(--text-color); color: var(--bg-color);
    border: none; border-radius: 50px; cursor: pointer; transition: 0.3s;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}
.explore-btn:hover { 
    transform: scale(1.1); background: var(--accent-color); color: #000; 
    box-shadow: 0 0 30px var(--accent-color);
}

/* 2. CÔNG CỤ ẨN HIỆN */
.hidden { display: none !important; }

/* 3. POPUP ĐĂNG NHẬP */
.login-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85); z-index: 9999;
    display: flex; justify-content: center; align-items: center;
    backdrop-filter: blur(8px);
}
.login-box {
    background: var(--card-bg); border: 1px solid var(--card-border);
    padding: 40px; border-radius: 20px; text-align: center;
    width: 350px; box-shadow: 0 0 50px rgba(0,0,0,0.5);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.login-box h2 { margin-bottom: 10px; color: var(--text-color); }
.login-box p { color: var(--gray-text); margin-bottom: 30px; font-size: 14px; }
.google-btn {
    width: 100%; padding: 12px; border: none; border-radius: 8px;
    background: #fff; color: #333; font-weight: bold; cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    transition: 0.3s; font-size: 14px;
}
.google-btn:hover { background: #f1f1f1; transform: translateY(-2px); }

.google-btn i {
    background: linear-gradient(to bottom right, #ea4335 0%, #ea4335 30%, #fbbc05 30%, #fbbc05 50%, #34a853 50%, #34a853 70%, #4285f4 70%, #4285f4 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent; 
    display: inline-block;
}

.close-login {
    background: transparent; border: none; color: var(--gray-text);
    margin-top: 15px; cursor: pointer; text-decoration: underline; font-size: 12px;
}
.user-avatar { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }

/* ĐỊNH DẠNG GIF */
.card-img-gif {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover;
    z-index: 1; opacity: 0; transition: opacity 0.3s ease;
}
.card:hover .card-img-gif { opacity: 1; }
.card:hover .card-img-static { opacity: 0; }

/* --- TOAST & CONFIRM BOX --- */
#toast-container {
    position: fixed; top: 20px; right: 20px; z-index: 10000;
    display: flex; flex-direction: column; gap: 10px;
}
.toast {
    background: rgba(20, 20, 20, 0.95);
    color: #fff;
    padding: 15px 25px;
    border-radius: 8px;
    border-left: 5px solid var(--accent-color);
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    display: flex; align-items: center; gap: 12px;
    min-width: 300px;
    animation: slideInRight 0.3s ease;
    backdrop-filter: blur(5px);
}
.toast i { font-size: 18px; }
.toast.success { border-color: #4caf50; } 
.toast.success i { color: #4caf50; }
.toast.error { border-color: #ff5252; }   
.toast.error i { color: #ff5252; }

@keyframes slideInRight { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; pointer-events: none; } }

.confirm-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8); z-index: 10001;
    display: flex; justify-content: center; align-items: center;
    backdrop-filter: blur(5px);
}
.confirm-box {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 30px; border-radius: 15px;
    width: 350px; text-align: center;
    box-shadow: 0 0 30px rgba(0,0,0,0.5);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.confirm-box h3 { color: var(--accent-color); margin-bottom: 10px; font-size: 22px; text-transform: uppercase; }
.confirm-box p { color: var(--text-color); margin-bottom: 25px; }
.confirm-actions { display: flex; justify-content: center; gap: 15px; }
.confirm-actions button {
    padding: 10px 20px; border-radius: 50px; border: none; font-weight: bold; cursor: pointer; transition: 0.3s;
}
.btn-cancel { background: #333; color: #fff; }
.btn-cancel:hover { background: #555; }
.btn-ok { background: var(--accent-color); color: #000; }
.btn-ok:hover { box-shadow: 0 0 15px var(--accent-color); transform: translateY(-2px); }

/* --- MOBILE OPTIMIZATION (ĐÃ CHỈNH MÀU CHUẨN CODE GỐC) --- */

@media (max-width: 1024px) {
    /* Full màn hình cho nav trên tablet/mobile */
    nav {
        min-width: unset; width: 100%; max-width: 100%;
        top: 0; left: 0; transform: none;
        border-radius: 0; border: none;
        padding: 10px 15px; height: auto; flex-wrap: wrap;
        background-color: var(--nav-bg);
        box-shadow: 0 4px 10px var(--shadow);
        backdrop-filter: blur(10px);
    }
    .container { margin-top: 140px; padding: 0 10px; }
}

@media (max-width: 768px) {
    /* Layout Mobile */
    nav {
        display: grid;
        grid-template-columns: auto 1fr auto; 
        align-items: center; gap: 10px; padding: 10px;
    }
    .nav-left, .nav-right { margin: 0; }
    .nav-container {
        grid-column: 1 / -1; order: 3;
        width: 100%; margin-top: 5px; padding-bottom: 5px;
        justify-content: flex-start; 
    }
    
    /* --- SỬA MÀU MENU CHUẨN PC CHO MOBILE --- */
    .nav-item {
        font-size: 12px; padding: 8px 12px; border-radius: 20px;
        background: transparent; /* Nền trong suốt khi chưa chọn */
        color: var(--gray-text);
        border: 1px solid transparent;
    }
    .nav-item.active {
        /* BẮT BUỘC dùng màu nền active của PC (Màu đen ở darkmode) */
        background-color: var(--nav-active-bg) !important; 
        color: var(--text-color) !important;
        font-weight: 700;
        border: 1px solid var(--card-border);
    }

    /* Grid 2 cột */
    .grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .card { border-radius: 8px; }

    /* Sửa bóng chữ dùng biến màu gốc */
    .card-label {
        font-size: 12px; top: 10px; left: 10px;
        background: none; padding: 0;
        max-width: 90%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    }

    /* Scroll bar ẩn */
    .category-tabs { gap: 15px; overflow-x: auto; justify-content: flex-start; padding-bottom: 5px; margin-bottom: 15px; }
    .category-tabs::-webkit-scrollbar { display: none; }
    .tab-btn { font-size: 14px; flex-shrink: 0; }

    .controls-container { flex-direction: column; align-items: flex-start; gap: 15px; margin-bottom: 20px; }
    .filters { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 10px; -webkit-overflow-scrolling: touch; }
    .filters::-webkit-scrollbar { display: none; }
    .filter-pill { flex-shrink: 0; padding: 6px 16px; font-size: 12px; }

    .download-btn { width: 100%; text-align: center; padding: 14px; font-size: 14px; }
    .login-box, .confirm-box { width: 90%; padding: 25px 20px; }
    .main-title { font-size: 28px; }
    .header-section { margin-bottom: 20px; }
    .back-btn { position: relative; top: auto; left: auto; transform: none; display: inline-block; margin-bottom: 10px; padding: 5px 10px; }

    /* --- SỬA LỖI PHÂN TRANG BỊ KHUẤT TRÊN MOBILE --- */
    .pagination {
        width: 100%;
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 10px;
        -webkit-overflow-scrolling: touch;
    }
    .pagination::-webkit-scrollbar { display: none; }
    .page-btn { flex-shrink: 0; }
}
/* =========================================
   HIỆU ỨNG TƯƠNG TÁC (MENU, GLOW & LƯỚI HẠT)
========================================= */

#home-section {
    position: relative;
    z-index: 10;
}

.home-container > * {
    position: relative;
    z-index: 20;
    text-shadow: 0 2px 10px var(--bg-color); /* Chữ rõ ràng hơn */
}

/* --- 1. HIỆU ỨNG ÁNH SÁNG CHUỘT (GIỮ NGUYÊN) --- */
.mouse-glow {
    position: fixed; top: 0; left: 0;
    width: 600px; height: 600px;
    background: radial-gradient(circle, var(--accent-color) 0%, transparent 50%);
    filter: blur(50px);
    border-radius: 50%;
    pointer-events: none;
    opacity: 0;
    z-index: 1; 
    transition: opacity 0.4s ease;
    will-change: transform;
}

/* --- 2. LƯỚI HẠT TƯƠNG TÁC (PARTICLES CANVAS) --- */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none; /* Không cản trở click */
    z-index: 0; /* Nằm dưới cùng nhất */
    opacity: 0;
    transition: opacity 0.7s ease;
}

#particle-canvas.active {
    opacity: 1;
}