/* ==============================================================
   CSS DÙNG CHUNG CHO CHUYÊN MỤC "THỦ THUẬT TIN HỌC" (TRICKS)
   ============================================================== */

:root {
    --bg-deep: #f0fdfa; 
    --bg-card: #ffffff; 
    --border-tech: rgba(8, 145, 178, 0.2); 
    --primary-neon: #0891b2; 
    --text-glow: #083344; 
    --text-dim: #334155;
    --shadow-neo: 0 10px 30px rgba(8, 145, 178, 0.08), 0 0 0 1px rgba(8, 145, 178, 0.05);
}

* { box-sizing: border-box; }

body { 
    background-color: var(--bg-deep); color: var(--text-dim); 
    font-family: 'Inter', sans-serif; margin: 0; padding: 0; 
    background-image: linear-gradient(rgba(8, 145, 178, 0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(8, 145, 178, 0.02) 1px, transparent 1px);
    background-size: 50px 50px; overflow-x: hidden;
}

/* ================= BỐ CỤC 3 CỘT ================= */
.page-wrapper {
    display: flex; width: 100%; max-width: 100%; margin: 0;
    min-height: 100vh; justify-content: space-between; align-items: stretch;
}

/* CỘT QUẢNG CÁO */
.ad-sidebar {
    flex: 0 0 320px; padding: 0; display: flex; flex-direction: column; align-items: center;
}

.sticky-ad-box {
    position: sticky; top: 0; width: 320px; height: 100vh; 
    background: #fff; border-left: 1px dashed var(--primary-neon); border-right: 1px dashed var(--primary-neon); border-radius: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
    color: #94a3b8; font-size: 0.8rem; font-family: 'Roboto Mono', monospace; text-align: center;
    box-shadow: var(--shadow-neo);
}

/* CỘT NỘI DUNG CHÍNH */
.main-column {
    flex: 1; max-width: 1000px; 
    display: flex; flex-direction: column; padding: 0px 5px; 
}

/* ================= PANEL TIÊU ĐỀ ================= */
.hero-panel {
    background: linear-gradient(135deg, #0f172a 0%, #0891b2 100%);
    border-radius: 0 0 5px 5px; padding: 40px 40px 20px 40px; margin-bottom: 5px; 
    box-shadow: 0 15px 30px rgba(8, 145, 178, 0.25);
    position: relative; overflow: hidden; color: #fff; border: 1px solid rgba(255,255,255,0.1); 
    text-align: center; /* Giữ tiêu đề to ở giữa */
}

.hero-panel::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 30px 30px; z-index: 1; pointer-events: none;
}

.home-btn-absolute {
    position: absolute; top: 15px; left: 15px; z-index: 10;
    width: 38px; height: 38px; border-radius: 5px; display: flex; justify-content: center; align-items: center; 
    color: var(--primary-neon); background: #fff; border: 1px solid rgba(255,255,255,0.8); 
    text-decoration: none; box-shadow: 0 4px 15px rgba(0,0,0,0.3); transition: 0.3s; font-size: 1.1rem;
}
.home-btn-absolute:hover { background: var(--primary-neon); color: #fff; transform: translateY(-2px); border-color: var(--primary-neon); }

.hero-content { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; }

.hero-title { font-family: 'Montserrat', sans-serif;
    font-size: 2.6rem;
    line-height: 1.35;
    margin: 0 0 0 0;
    font-weight: 800;
    max-width: 900px;
    text-shadow: 0 10px 25px rgba(0,0,0,0.5); }

/* THÔNG TIN META*/
.hero-meta { 
    display: flex; flex-wrap: wrap; align-items: center; 
    width: 100%; gap: 15px; font-family: 'Roboto Mono', monospace; font-size: 0.85rem; color: rgba(255,255,255,0.9);
    margin-top: 20px;
}
.hero-meta i { color: #67e8f9; margin-right: 5px; }

/* Thẻ Category đẩy sang trái, phần còn lại dạt sang phải */
.hero-category { 
    display: inline-flex; align-items: center; gap: 6px; background: rgba(255,255,255,0.15); backdrop-filter: blur(5px); 
    padding: 4px 15px; border-radius: 5px; border: 1px solid rgba(255,255,255,0.3); letter-spacing: 1px; font-weight: bold; text-transform: uppercase; 
    margin-right: auto; 
}
.view-count { font-weight: 700; color: #fff; text-shadow: 0 0 10px rgba(103, 232, 249, 0.8); }

/* ================= BÀI VIẾT CHÍNH ================= */
.article-content {
    background: var(--bg-card); border-radius: 5px; padding: 10px 30px 10px 30px;
    border: 1px solid var(--border-tech); box-shadow: var(--shadow-neo); text-align: justify;
}

/* KHUNG MỤC LỤC TRONG BÀI */
.toc-inline-box {
    background: var(--bg-deep); border: 1px dashed var(--primary-neon);
    border-radius: 5px;
    padding: 0px 15px 10px 15px;
    margin-top: 25px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(8, 145, 178, 0.05);
}
.toc-title { font-family: 'Montserrat', sans-serif;
    font-size: 1.1rem;
    line-height: 2;
    color: var(--text-glow);
    margin-top: 5px;
    margin-bottom: 15px;
    border-bottom: 2px dashed var(--border-tech);
    text-transform: uppercase;}
.toc-list { list-style: none; padding: 5px 10px 10px 10px; margin: 0; }
.toc-list li { margin-bottom: 5px; }
.toc-list li:last-child { margin-bottom: 0; }
.toc-list a { text-decoration: none; color: var(--text-dim); font-size: 0.95rem; font-weight: 500; display: flex; align-items: flex-start; gap: 8px; transition: 0.2s; line-height: 1.6; }
.toc-list a::before { content: "\f105"; font-family: "Font Awesome 6 Free"; font-weight: 900; font-size: 0.7rem; color: var(--primary-neon); margin-top: 4px; }
.toc-list a:hover { color: var(--primary-neon); transform: translateX(5px); font-weight: 600;}


/* ĐỊNH DẠNG CHỮ & ẢNH */
.article-content h2 { 
    font-family: 'Montserrat', sans-serif;
    font-size: 1.6rem; 
    color: var(--text-glow); 
    margin-top: 15px; 
    margin-bottom: 15px;
    display: flex; 
    align-items: center;
    gap: 12px; 
    text-align: justify; 
    clear: both; }
.article-content h2::before { content: ""; display: block; width: 6px; height: 26px; background: var(--primary-neon); border-radius: 4px; text-align: justify; }
.article-content p { 
    font-size: 1.1rem; 
    line-height: 1.6; 
    margin-top: 5px;
    margin-bottom: 5px; 
    text-align: justify; /* Lệnh canh đều 2 bên mép */
    color: var(--text-dim); 
    text-indent: 30px; /* Lệnh thụt đầu dòng 30px (khoảng 2 ký tự) */
}

.article-content strong { color: var(--text-glow); font-weight: 700; }
.article-content ul{ line-height: 1.6; margin: 0px; font-size: 1.1rem; color: var(--text-dim); padding-left: 15px; text-indent: 10px; display: flow-root; }
.article-content li{ line-height: 1.6; margin-left: 30px;}
.article-img-box { margin: 30px 0; text-align: center; }
.article-img-box img { max-width: 100%; border-radius: 12px; box-shadow: 0 10px 25px rgba(0,0,0,0.1); border: 1px solid var(--border-tech); transition: 0.3s; }
.article-img-box img:hover { transform: scale(1.02); box-shadow: 0 15px 35px rgba(8, 145, 178, 0.2); }
.img-caption { font-family: 'Roboto Mono', monospace; font-size: 0.85rem; color: #94a3b8; margin-top: 10px; font-style: italic; }

.cyber-tip { background: rgba(8, 145, 178, 0.05); border-left: 4px solid var(--primary-neon); padding: 20px 25px; border-radius: 0 5px 5px 0; margin: 30px 0; line-height: 1.6; }
.cyber-tip-title { font-family: 'Montserrat', sans-serif; font-size: 1.05rem; color: var(--primary-neon); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; text-transform: uppercase;}
.cyber-tip p { margin: 0; font-size: 1rem; text-indent: 30px !important; line-height: 1.6; }

/* ================= ĐỊNH DẠNG CHO DANH SÁCH CÓ SỐ (OL) ================= */
.content-wrap ol li, .article-content ol li {
    font-size: 1.1rem;
    line-height: 1.8;       /* Dãn dòng chuẩn bằng với các đoạn văn khác */
    text-align: justify;
    color: var(--text-dim);
    display: flow-root;     /* Chống bị hình ảnh đè lề (giống ul) */
}

/* ================= CẢI TIẾN LAYOUT CHỮ ÔM HÌNH (TEXT WRAPPING) ================= */
.content-wrap {
    display: flow-root; 
    margin-top: 5px;
    margin-bottom: 5px;
}

.img-float-right {
    float: right;
    width: 45%;
    max-width: 420px;
    margin-top: 5px;
    margin-left: 15px;
    margin-bottom: 15px;
    text-align: center;
}

.img-float-left {
    float: left;
    width: 45%;
    max-width: 420px;
    margin-top: 5px;
    margin-right: 5px;
    margin-bottom: 15px;
    text-align: center;
}

.img-float-right img, .img-float-left img {
    width: 100%;
    height: auto;
    border-radius: 5px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    border: 1px solid #e2e8f0;
    display: block;
}

.img-caption-inline {
    font-size: 0.7rem;
    color: #64748b;
    margin-top: 10px;
    font-style: italic;
}


/* ================= RESPONSIVE ================= */
@media (max-width: 1300px) {
    .ad-sidebar { flex: 0 0 180px; } 
    .sticky-ad-box { width: 160px; }
    .hero-title { font-size: 2.2rem; }
}

@media (max-width: 1024px) {
    .ad-sidebar { display: none; } 
}

@media (max-width: 800px) {
    .hero-panel { padding: 60px 20px 30px 20px; }
    .hero-title { font-size: 1.8rem; }
    .article-content { padding: 30px 25px; }
}

@media (max-width: 768px) {
    /* Responsive: Khi màn hình nhỏ (Điện thoại), hủy float để ảnh và chữ xếp dọc */
    .img-float-right, .img-float-left {
        float: none;
        width: 100%;
        max-width: 100%;
        margin: 0 auto 20px auto;
    }
}

@media (max-width: 600px) {
    .hero-meta { flex-direction: column; align-items: flex-start; gap: 10px; }
    .hero-category { margin-right: 0; }
    .article-content { padding: 20px 15px; }
    .article-content h2 { font-size: 1.3rem; }
    .article-content p, .article-content ul { font-size: 1rem; }
}


/* ================= WIDGET CHAT LIÊN HỆ ĐA KÊNH ================= */
.chat-widget-container {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

/* Menu xổ lên */
.chat-menu {
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 10px 40px rgba(8, 145, 178, 0.2);
    margin-bottom: 15px;
    overflow: hidden;
    width: 220px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid var(--border-tech);
}

/* Khi menu được kích hoạt */
.chat-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Từng lựa chọn trong Menu */
.chat-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 20px;
    color: var(--text-dim);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s;
    border-bottom: 1px solid #f1f5f9;
}

.chat-option:hover {
    background: #f0fdfa;
    color: var(--primary-neon);
}

.chat-option i { font-size: 1.2rem; }

/* Khung chứa mã QR Zalo */
.zalo-qr-box {
    display: none; /* Ẩn mặc định */
    padding: 15px;
    text-align: center;
    background: #f8fafc;
}

.zalo-qr-box.active {
    display: block; /* Hiện khi bấm vào */
}

.zalo-qr-box img {
    width: 100%;
    max-width: 150px;
    border-radius: 5px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    border: 2px solid #fff;
}

.zalo-qr-box p {
    margin: 10px 0 0 0;
    font-size: 0.85rem;
    color: var(--text-dim);
    font-weight: 500;
}

/* Nút Bong bóng Chat chính */
.chat-bubble {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-neon), #0369a1);
    color: #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    box-shadow: 0 10px 25px rgba(8, 145, 178, 0.4);
    border: none;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
    animation: pulse-glow 2s infinite;
}

.chat-bubble:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 35px rgba(8, 145, 178, 0.6);
}

@keyframes pulse-glow {
    0% { box-shadow: 0 0 0 0 rgba(8, 145, 178, 0.5); }
    70% { box-shadow: 0 0 0 15px rgba(8, 145, 178, 0); }
    100% { box-shadow: 0 0 0 0 rgba(8, 145, 178, 0); }
}

@media (max-width: 600px) {
    .chat-widget-container { bottom: 20px; right: 20px; }
    .chat-bubble { width: 50px; height: 50px; font-size: 1.5rem; }
}