/* RESET TIÊU CHUẨN */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
}

body {
    background-color: #0b0e11;
    color: #eaecef;
    line-height: 1.6;
}

/* THANH MENU ĐIỀU HƯỚNG */
header {
    background-color: #181a20;
    border-bottom: 1px solid #2f3336;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: #f0b90b;
}

.logo span {
    color: #fff;
    font-weight: 300;
    font-size: 16px;
    margin-left: 3px;
}

nav a {
    color: #b7bdc6;
    text-decoration: none;
    margin-left: 20px;
    font-size: 14px;
    font-weight: 600;
    transition: 0.3s;
}

nav a:hover {
    color: #f0b90b;
}

/* CONTAINER CHÍNH */
.main-container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

/* HERO SECTION */
.hero-section {
    text-align: center;
    margin: 40px 0;
}

.hero-section h1 {
    font-size: 32px;
    color: #fff;
    margin-bottom: 10px;
}

.hero-section p {
    color: #848e9c;
}

/* KHỐI NỘI DUNG (CARDS) */
.card-section {
    background-color: #181a20;
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid #2b3139;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #2b3139;
    padding-bottom: 10px;
}

.section-header h2 {
    font-size: 20px;
    color: #fff;
}

.badge {
    background-color: #02c076;
    color: #fff;
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: bold;
}

.badge.gold {
    background-color: #f0b90b;
    color: #000;
}

/* QUẢNG CÁO KHUNG */
.ad-box {
    background-color: #111417;
    border: 1px dashed #474d57;
    color: #474d57;
    text-align: center;
    padding: 40px;
    margin-bottom: 30px;
    border-radius: 6px;
    font-size: 14px;
}

/* BẢNG DỮ LIỆU ĐÁP ỨNG DI ĐỘNG */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 14px;
    text-align: left;
    border-bottom: 1px solid #2b3139;
    font-size: 14px;
}

th {
    background-color: #212630;
    color: #848e9c;
    font-weight: 600;
}

td strong {
    color: #fff;
}

/* GIAO DIỆN GRID VÀ MÁY TÍNH */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.gold-item {
    background-color: #212630;
    padding: 20px;
    border-radius: 6px;
    text-align: center;
}

.price-display {
    font-size: 28px;
    font-weight: 700;
    color: #f0b90b;
    margin-top: 10px;
}

.price-display.silver {
    color: #b7bdc6;
}

/* BỘ MÁY TÍNH LỢI NHUẬN */
.grid-2-calc {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 30px;
    margin-top: 15px;
}

.calc-desc {
    color: #848e9c;
    margin-bottom: 15px;
    font-size: 14px;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    font-size: 13px;
    color: #b7bdc6;
    margin-bottom: 5px;
}

.input-group input {
    width: 100%;
    padding: 10px;
    background-color: #212630;
    border: 1px solid #474d57;
    border-radius: 4px;
    color: #fff;
    font-size: 15px;
}

.btn-calc {
    background-color: #02c076;
    color: #fff;
    border: none;
    padding: 12px 20px;
    font-weight: bold;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    transition: 0.3s;
}

.btn-calc:hover {
    background-color: #03a666;
}

.calc-results {
    background-color: #212630;
    padding: 20px;
    border-radius: 6px;
    border-left: 4px solid #02c076;
}

.calc-results h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: #fff;
}

.result-item {
    font-size: 14px;
    margin-bottom: 12px;
    color: #b7bdc6;
}

.result-item span {
    font-weight: bold;
    color: #fff;
    display: block;
    font-size: 18px;
    margin-top: 2px;
}

/* KHU VỰC BÀI VIẾT KIẾN THỨC */
.content-rich .article {
    margin-bottom: 25px;
}

.content-rich h3 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 8px;
}

.content-rich p {
    color: #b7bdc6;
    font-size: 14px;
    text-align: justify;
}

/* THANH AFFILIATE */
.affiliate-bar {
    background: linear-gradient(90deg, #1e2329 0%, #2b313a 100%);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid #474d57;
}

.affiliate-bar h3 {
    font-size: 16px;
    color: #fff;
    margin-bottom: 15px;
}

.aff-links {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.btn-aff {
    background-color: #02c076;
    color: #fff;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 14px;
    transition: 0.3s;
}

.btn-aff.gold-btn {
    background-color: #f0b90b;
    color: #000;
}

/* FOOTER */
footer {
    background-color: #181a20;
    padding: 30px;
    text-align: center;
    border-top: 1px solid #2b3139;
    font-size: 13px;
    color: #848e9c;
    margin-top: 50px;
}

footer a {
    color: #848e9c;
    text-decoration: none;
    margin: 0 5px;
}

footer a:hover {
    color: #fff;
}

/* ĐÁP ỨNG MÀN HÌNH NHỎ (MOBILE) */
@media (max-width: 768px) {
    .nav-container { flex-direction: column; gap: 10px; }
    nav a { margin: 0 10px; }
    .grid-2, .grid-2-calc { grid-template-columns: 1fr; }
}
/* NÚT CHUYỂN ĐỔI NGÔN NGỮ VI/EN */
.lang-switcher {
    display: flex;
    gap: 5px;
    background-color: #212630;
    padding: 4px;
    border-radius: 4px;
    border: 1px solid #474d57;
}

.lang-btn {
    background: none;
    border: none;
    color: #848e9c;
    padding: 5px 10px;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 3px;
    transition: 0.2s;
}

.lang-btn.active {
    background-color: #f0b90b;
    color: #000;
}

.lang-btn:hover:not(.active) {
    color: #fff;
}

/* GIAO DIỆN KHU VỰC TIN TỨC */
.news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 15px;
}

.news-card {
    background-color: #212630;
    padding: 20px;
    border-radius: 6px;
    border: 1px solid #2b3139;
    transition: 0.3s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.news-card:hover {
    border-color: #f0b90b;
    transform: translateY(-2px);
}

.news-card h3 {
    font-size: 15px;
    color: #fff;
    margin-bottom: 12px;
    font-weight: 600;
    line-height: 1.4;
    text-align: left;
}

.news-card a {
    text-decoration: none;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    font-size: 12px;
}

.news-tag {
    background-color: #2b3139;
    color: #f0b90b;
    padding: 2px 6px;
    border-radius: 3px;
    font-weight: bold;
    text-transform: uppercase;
}

.news-time {
    color: #848e9c;
}

/* Responsive cho điện thoại di động */
@media (max-width: 768px) {
    .news-grid { grid-template-columns: 1fr; }
}