/* ================= BASE STYLES ================= */
:root {
    --bg-color: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-danger: #fb0d0d;
    --accent-danger-hover: #dc4242;
    --panel-bg: #1e293b;
    --border-color: #334155;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: url('../images/default-bg.png') center no-repeat;
    background-attachment: fixed;
    color: var(--text-main);
    overflow-x: hidden;
    scroll-behavior: smooth;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
}

/* ================= HEADER & NAVIGATION ================= */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1001;
}

.logo-image {
    height: 75px;
    width: 100%;
}

.nav-links {
    display: flex;
    gap: 20px;
    transition: all 0.4s ease;
}

    .nav-links a {
        font-weight: 500;
        transition: color 0.3s;
        padding: 8px 16px;
        border-radius: 4px;
        background: var(--panel-bg);
        /* 1. Establish the flexbox container */
        display: inline-flex;
        /* 2. Align items vertically in the center */
        align-items: center;
        /* 3. Align items horizontally in the center */
        justify-content: center;
    }

        .nav-links a:hover {
            color: var(--accent);
            background: var(--border-color);
        }

/* Small nav icon image styling */
.nav-icon {
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 25px;
}

.nav-links-image {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    z-index: 1001;
}

    .hamburger span {
        width: 25px;
        height: 3px;
        background: var(--accent);
        border-radius: 3px;
        transition: all 0.3s ease;
    }

/* ================= FLOATING MENU ================= */
.float-menu {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 15px;
    animation: flyUpDown 4s ease-in-out infinite alternate;
}

@keyframes flyUpDown {
    0% {
        transform: translateY(-55%);
    }

    100% {
        transform: translateY(-45%);
    }
}

.float-menu a {
    width: 90px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s, background 0.3s;
}

    .float-menu a:hover {
        transform: scale(1.1) translateY(-45%);
        background: var(--accent-hover);
    }

/* ================= SECTION COMMON & EFFECTS ================= */
section {
    min-height: 100vh;
    padding: 100px 5% 50px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* --- BEAUTIFUL NEW SECTION TITLE BACKGROUND & EFFECTS --- */
.section-title {
    position: relative;
    font-size: 2.8rem;
    font-weight: 800;
    text-align: center;
    margin: 0 auto 60px;
    padding: 15px 40px;
    width: fit-content;
    letter-spacing: 2px;
    text-transform: uppercase;
    /* Gradient Text Effect */
    background: linear-gradient(135deg, #ffffff 30%, #d20707 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 8px rgba(59, 130, 246, 0.3));
}

    /* Ambient Glowing Background Pod under Title */
    .section-title::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 110%;
        height: 100%;
        background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.08) 0%, rgba(15, 23, 42, 0) 70%);
        z-index: -1;
        pointer-events: none;
    }

    /* Techy Bottom Underline Indicator */
    .section-title::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 60px;
        height: 4px;
        background: linear-gradient(135deg, #ffffff 30%, #d20707 100%);
        border-radius: 2px;
        box-shadow: 0 0 10px var(--accent);
        transition: width 0.4s ease;
    }

    /* Hover animation effect on the section title tracking */
    .section-title:hover::after {
        width: 120px;
    }

.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease-out;
}

    .reveal.active {
        opacity: 1;
        transform: translateY(0);
    }

/* ================= CUSTOM BACKGROUNDS FOR EACH PART ================= */
#part1 {
    background: url('../images/home-banner.png') center/cover no-repeat;
    text-align: center;
    align-items: center;
    justify-content: center;
}

#part2 {
    background: url('../images/part-1-bg.jpg') center/cover no-repeat;
}

#part3 {
    background: url('../images/part-2-bg.jpg') center/cover no-repeat;
}

#part4 {
    background: url('../images/part-3-bg.jpg') center/cover no-repeat;
}

#part4-2 {
    background: url('../images/part-4-bg.jpg') center/cover no-repeat;
}

#part5 {
    background: url('../images/part-4-2-bg.jpg') center/cover no-repeat;
}

/* ================= PART 1: BANNER ================= */
.banner-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
}

.banner-content p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    max-width: 600px;
}

.btn-primary {
    background: var(--accent);
    color: white;
    padding: 15px 30px;
    font-size: 1.1rem;
    border-radius: 8px;
    transition: 0.3s;
}

    .btn-primary:hover {
        background: var(--accent-hover);
        box-shadow: 0 0 15px var(--accent);
    }

/* ================= PART 2: NEWS TABS ================= */
.tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    background: var(--panel-bg);
    color: var(--text-main);
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
}

    .tab-btn.active {
        background: var(--accent);
        border-color: var(--accent);
    }

.tab-content {
    display: none;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 130px);
    gap: 20px;
}

    .tab-content.active {
        display: grid;
        animation: fadeIn 0.5s ease;
    }

.news-card {
    background: var(--panel-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

    .news-card h3 {
        margin-bottom: 10px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .news-card p {
        color: var(--text-muted);
        font-size: 0.9rem;
        line-height: 1.4;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        text-overflow: ellipsis;
    }

.show-more {
    display: block;
    text-align: center;
    margin-top: 30px;
    color: var(--accent);
    font-weight: bold;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* ================= PART 3: CLASSES ================= */
.class-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    width: 100%;
}

.media-stack {
    position: relative;
    width: 100%;
    /* max-width: 900px; */
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
}

    .media-stack video {
        width: 70%;
        aspect-ratio: 16/9;
        object-fit: cover;
        z-index: 1;
        transition: opacity 0.3s;
    }

    .media-stack img {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 2;
        pointer-events: none;
        transition: opacity 0.3s;
    }

.circle-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.circle-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    color: white;
    font-weight: bold;
    transition: 0.3s;
}

    .circle-btn.active {
        border-color: var(--accent);
        transform: scale(1.1);
    }

.class-btn-1 {
    background: url('../images/ic-vodang.png') center no-repeat;
}

    .class-btn-1.active {
        background: url('../images/ic-vodang-active.png') center no-repeat;
    }

.class-btn-2 {
    background: url('../images/ic-magiao.png') center no-repeat;
}

    .class-btn-2.active {
        background: url('../images/ic-magiao-active.png') center no-repeat;
    }

.class-btn-3 {
    background: url('../images/ic-caibang.png') center no-repeat;
}

    .class-btn-3.active {
        background: url('../images/ic-caibang-active.png') center no-repeat;
    }

.class-btn-4 {
    background: url('../images/ic-bicung.png') center no-repeat;
}

    .class-btn-4.active {
        background: url('../images/ic-bicung-active.png') center no-repeat;
    }

.class-btn-5 {
    background: url('../images/ic-luclam.png') center no-repeat;
}

    .class-btn-5.active {
        background: url('../images/ic-luclam-active.png') center no-repeat;
    }

.class-btn-6 {
    background: url('../images/ic-thieulam.png') center no-repeat;
}

    .class-btn-6.active {
        background: url('../images/ic-thieulam-active.png') center no-repeat;
    }

/* ================= PART 4 & 4-2: FEATURE CAROUSELS ================= */
.features-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
}

.feature-main-video {
    width: 100%;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    background: #000;
}

    .feature-main-video video {
        width: 100%;
        aspect-ratio: 16/9;
        object-fit: cover;
        transition: opacity 0.4s ease;
    }

.carousel-wrapper {
    display: flex;
    align-items: center;
    width: 100%;
    gap: 15px;
}

.carousel-track-container {
    flex: 1;
    overflow: hidden;
}

.carousel-track {
    display: flex;
    gap: 15px;
}

.carousel-item {
    flex: 0 0 calc(33.333% - 10px);
    aspect-ratio: 16/9;
    border-radius: 8px;
    overflow: hidden;
    opacity: 0.4;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

    .carousel-item img {
        width: 100%;
        height: 100%;
        object-fit: fill;
    }

    .carousel-item.active {
        opacity: 1;
        border-color: var(--accent);
        transform: scale(1.05);
        box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
    }

.slider-btn {
    background: var(--accent);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    flex-shrink: 0;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

    .slider-btn:hover {
        background: var(--accent-hover);
    }

/* ================= PART 5: RANKING ================= */
.table-container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    background: var(--panel-bg);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.2);
}

tr:hover {
    background: rgba(59, 130, 246, 0.1);
}

/* ================= FOOTER ================= */
footer {
    background: #0b1121;
    text-align: center;
    padding: 40px 20px;
    border-top: 1px solid var(--border-color);
}


/* ================= FORM PAGE SPECIFIC ================= */
.page-wrapper {
    padding: 120px 5% 50px;
    max-width: 750px;
    width: 100%;
    margin: 0 auto;
    flex-grow: 1;
    min-height: 100vh;
}

.page-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 10px;
    color: var(--accent);
    background-color: var(--panel-bg);
}

.page-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: 0.95rem;
}

.form-container {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 8px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

    .form-group label {
        font-size: 0.9rem;
        color: var(--text-main);
        font-weight: 500;
    }

    .form-group input {
        background: var(--bg-color);
        border: 1px solid var(--border-color);
        color: var(--text-main);
        padding: 12px;
        border-radius: 5px;
        font-size: 0.95rem;
        transition: border-color 0.3s;
    }

        .form-group input:focus {
            border-color: var(--accent);
            outline: none;
        }

.submit-btn {
    width: 100%;
    background: var(--accent);
    color: var(--text-main);
    padding: 14px;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: bold;
    margin-top: 10px;
    transition: background 0.3s;
    text-align: center;
}

    .submit-btn:hover {
        background: var(--accent-hover);
    }

.submit-btn-danger {
    width: 100%;
    background: var(--accent-danger);
    color: var(--text-main);
    padding: 14px;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: bold;
    margin-top: 10px;
    transition: background 0.3s;
    text-align: center;
}

.submit-btn--danger:hover {
    background: var(--accent-danger-hover);
}

.form-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

    .form-footer a {
        color: var(--accent);
        font-weight: 500;
    }

        .form-footer a:hover {
            text-decoration: underline;
        }

/* 2-Column Grid Layout */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px 24px;
}

/* ================= ERROR POPUP MODAL ================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

    .modal-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }

.modal-box {
    background: var(--panel-bg);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 30px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-box {
    transform: scale(1);
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    color: var(--error);
}

.modal-title {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.modal-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.5;
}

.modal-close {
    background: var(--border-color);
    color: var(--text-main);
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 0.95rem;
    transition: 0.3s;
}

    .modal-close:hover {
        background: var(--text-muted);
        color: var(--bg-color);
    }

footer {
    background: #0b1121;
    text-align: center;
    padding: 40px 20px;
    border-top: 1px solid var(--border-color);
}

/* ================= NEWS DETAIL SPECIFIC ================= */
.article-wrapper {
    min-height: calc(100vh - 70px);
    padding: 100px 5% 50px;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 20px;
    transition: 0.3s;
}

    .back-btn:hover {
        color: var(--accent);
        transform: translateX(-5px);
    }

.article-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.article-title {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 15px;
    line-height: 1.2;
}

.article-meta {
    display: flex;
    gap: 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
}

    .article-meta span {
        display: flex;
        align-items: center;
        gap: 5px;
    }

.article-hero {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 30px;
}

.article-body p {
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 1.05rem;
    color: #cbd5e1;
}

.article-body h2 {
    color: var(--text-main);
    margin: 35px 0 15px 0;
    font-size: 1.8rem;
}

.article-body ul {
    margin-bottom: 20px;
    padding-left: 20px;
    color: #cbd5e1;
    line-height: 1.8;
}

.article-body li {
    margin-bottom: 10px;
}

/* ================= NEWS PAGE SPECIFIC ================= */
.page-wrapper {
    min-height: calc(100vh - 70px);
    padding: 100px 5% 50px;
    max-width: 1000px;
    margin: 0 auto;
}

.page-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 30px;
    color: var(--accent);
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    background: var(--panel-bg);
    color: var(--text-main);
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    transition: 0.3s;
}

    .tab-btn.active, .tab-btn:hover {
        background: var(--accent);
        border-color: var(--accent);
    }

/* SCROLL CONTAINER LOGIC */
.news-scroll-area {
    background-color: #607597;
    max-height: 65vh;
    overflow-y: auto;
    padding-right: 15px;
}

    .news-scroll-area::-webkit-scrollbar {
        width: 8px;
    }

    .news-scroll-area::-webkit-scrollbar-track {
        background: var(--bg-color);
        border-radius: 4px;
    }

    .news-scroll-area::-webkit-scrollbar-thumb {
        background: var(--accent);
        border-radius: 4px;
    }

        .news-scroll-area::-webkit-scrollbar-thumb:hover {
            background: var(--accent-hover);
        }

/* SINGLE ROW LIST STYLING */
.tab-content {
    display: none;
    flex-direction: column;
    gap: 12px;
    padding-bottom: 10px;
}

    .tab-content.active {
        display: flex;
        animation: fadeIn 0.4s ease;
    }

.news-row {
    background: var(--panel-bg);
    padding: 16px 24px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s, border-color 0.2s;
    cursor: pointer;
    gap: 20px;
}

    .news-row:hover {
        transform: translateX(5px);
        border-color: var(--accent);
        background: rgba(59, 130, 246, 0.05);
    }

    .news-row h3 {
        margin: 0;
        font-size: 1.1rem;
        color: var(--text-main);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        flex: 1; /* Pushes the date to the right */
    }

    .news-row .date {
        font-size: 0.9rem;
        color: var(--text-muted);
        white-space: nowrap;
        flex-shrink: 0; /* Prevents the date from squishing on mobile */
    }


/* ================= RESPONSIVE ================= */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 20px 5%;
        gap: 15px;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-150%);
        opacity: 0;
        z-index: -1;
    }

        .nav-links.active {
            transform: translateY(0);
            opacity: 1;
            z-index: 999;
        }

        .nav-links a {
            text-align: center;
            padding: 12px;
            display: block;
        }

    .hamburger.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .float-menu {
        top: auto;
        bottom: 20px;
        right: 50%;
        transform: translateX(50%);
        flex-direction: row;
        animation: none;
    }

        .float-menu:hover {
            transform: translateX(50%);
        }

        .float-menu a:hover {
            transform: scale(1.1);
        }

    .banner-content h1 {
        font-size: 2.5rem;
    }

    .tab-content {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(4, 130px);
    }

    .slider-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}