/* ============================================================
   RESET & CƠ BẢN
============================================================ */

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

:root {
    --green: #00ff99;
    --green-soft: #22ffaa;
    --bg-dark: #0b1b13;
    --bg-block: #0f261a;
    --text-light: #e9ffee;
    --text-green: #a8ffd2;
    --shadow-green: 0 0 15px rgba(0, 255, 150, 0.2);
}

body {
    font-family: "Segoe UI", Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
}

/* ============================================================
   HIỆU ỨNG NEON
============================================================ */
 body, h1, h2, h3, h4, h5, h6, p, a, li, input, button {
                font-weight: 600;
            }
.neon {
    color: var(--green);
    text-shadow: 0 0 10px var(--green), 0 0 20px var(--green);
}

/* ============================================================
   HEADER
============================================================ */

.header {
    background: linear-gradient(90deg, #001b11, #00361d);
    border-bottom: 2px solid var(--green);
    box-shadow: var(--shadow-green);
    padding: 12px 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 2rem;       /* kích thước chữ */
    font-weight: 700;      /* chữ đậm */
    margin: 0;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 25px;
}

nav a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 600;
    padding: 8px 14px;
    border-radius: 6px;
    transition: 0.3s;
}

nav a:hover,
nav a.active {
    background-color: var(--green);
    color: var(--bg-dark);
    box-shadow: 0 0 10px var(--green);
}

/* ============================================================
   HERO SLIDER
============================================================ */

.hero {
    position: relative;
    height: 600px;
    overflow: hidden;
}

.slides,
.slide {
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    justify-content: center;
    align-items: center;
}

.slide.active {
    opacity: 1;
}

.hero-content {
    background: rgba(0, 30, 20, 0.7);
    padding: 40px 60px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 0 25px rgba(0, 255, 100, 0.4);
}

.hero-content h2 {
    color: var(--green);
    font-size: 42px;
    margin-bottom: 10px;
    text-shadow: 0 0 10px var(--green);
}

.hero-content p {
    color: #d0ffea;
    font-size: 18px;
    margin-bottom: 25px;
}

.hero .btn {
    display: inline-block;
    background: var(--green);
    color: var(--bg-dark);
    padding: 12px 28px;
    border-radius: 6px;
    font-weight: 700;
    text-decoration: none;
    transition: 0.3s;
}

.hero .btn:hover {
    background: var(--green-soft);
    box-shadow: 0 0 20px var(--green);
    transform: translateY(-3px);
}

/* NÚT NEXT – PREV */
.prev, .next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    border: none;
    color: var(--green);
    font-size: 42px;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 50%;
    transition: 0.3s;
}

.prev:hover, .next:hover {
    background: rgba(0, 255, 150, 0.3);
    color: #fff;
    box-shadow: 0 0 15px var(--green);
}

.prev { left: 25px; }
.next { right: 25px; }

/* ============================================================
   FEATURED GAMES
============================================================ */

.featured-games {
    padding: 60px 0;
    text-align: center;
}

.section-title {
    font-size: 30px;
    color: var(--green);
    text-shadow: 0 0 10px var(--green);
    margin-bottom: 30px;
}

.game-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    justify-content: center;
}

/* --- THE GAME BOX --- */

.the-game {
    background: var(--bg-block);
    border: 1px solid #004d2b;
    border-radius: 10px;
    padding: 15px;
    width: 260px;
    transition: 0.3s;
    box-shadow: 0 0 10px rgba(0, 255, 100, 0.05);
}

.the-game img {
    width: 100%;
    height: 320px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 12px;
}

.the-game h3 {
    color: var(--text-green);
    margin-bottom: 8px;
}

.price {
    color: var(--green);
    font-weight: 700;
    margin-bottom: 10px;
}

.the-game .btn {
    display: inline-block;
    background: var(--green);
    color: var(--bg-dark);
    padding: 8px 18px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s;
}

.the-game .btn:hover {
    background: var(--green-soft);
    box-shadow: 0 0 15px var(--green);
}

.the-game:hover {
    transform: translateY(-6px);
    box-shadow: 0 0 20px rgba(0, 255, 120, 0.3);
    border-color: var(--green);
}

/* ============================================================
   FOOTER
============================================================ */

footer {
    text-align: center;
    padding: 20px;
    background: linear-gradient(90deg, #001d12, #003a20);
    border-top: 2px solid var(--green);
    color: #d4ffe9;
    font-size: 14px;
    margin-top: 60px;
}

/* ============================================================
   SEARCH BOX
============================================================ */

.search-box {
    width: 60%;
    display: block;
    margin: 0 auto 40px;
    padding: 15px 25px;
    font-size: 18px;
    border: 2px solid var(--green);
    border-radius: 10px;
    background: #002415;
    color: var(--green);
    box-shadow: 0 0 10px rgba(0, 255, 150, 0.3);
    transition: 0.3s;
    background-image: url("./img/games-icon-png-4.png");
    background-repeat: no-repeat;
    background-size: 26px;
    background-position: 20px center;
    text-indent: 45px;
}

.search-box::placeholder {
    color: #33ffaa;
}

.search-box:focus {
    outline: none;
    background-color: #00391f;
    box-shadow: 0 0 20px var(--green);
}

/* ============================================================
   CART BUTTONS
============================================================ */

.remove-btn,
#checkoutBtn {
    font-weight: 600;
    border-radius: 6px;
    padding: 10px 25px;
    cursor: pointer;
    transition: 0.3s;
}

/* nút remove */
.remove-btn {
    background: transparent;
    border: 2px solid var(--green);
    color: var(--green);
}

.remove-btn:hover {
    background: var(--green);
    color: var(--bg-dark);
    box-shadow: 0 0 15px var(--green);
    transform: translateY(-2px);
}

/* nút thanh toán */
#checkoutBtn {
    background: linear-gradient(90deg, var(--green), var(--green-soft));
    color: var(--bg-dark);
    border: none;
    font-size: 17px;
    letter-spacing: 0.5px;
}

#checkoutBtn:hover {
    background: var(--green-soft);
    box-shadow: 0 0 25px var(--green);
    transform: translateY(-3px);
}

.game-detail-wrapper { display: flex; flex-wrap: wrap; gap: 40px; align-items: flex-start; margin-top: 60px; }
        .game-detail-wrapper img { width: 100%; max-width: 400px; height: auto; border-radius: 10px; box-shadow: 0 0 25px rgba(0,255,150,0.4); border: 2px solid #004d2b; }
        .game-detail-info { flex: 1; min-width: 280px; }
        .game-detail-info h2 { font-size: 40px; margin-bottom: 20px; }
        .game-detail-info p, .game-detail-info ul { font-size: 17px; line-height: 1.6; }
        .game-detail-info .price { font-size: 26px; margin: 25px 0; color: #00ff99; }
        hr { margin: 40px 0; border-color: #004d2b; opacity: 0.5; }
        #btnBuyNow {
            background-color: #00ff99;
            color: #0b1b13;
            border: none;
            border-radius: 8px;
            padding: 12px 35px;
            font-size: 18px;
            font-weight: 700;
            transition: 0.3s;
            box-shadow: 0 0 15px rgba(0,255,153,0.5);
        }
        #btnBuyNow:hover {
            background-color: #00cc7a;
            color: #0b1b13;
            box-shadow: 0 0 25px rgba(0,255,153,0.8);
            transform: translateY(-2px);
            cursor: pointer;
        }
        .popup-message {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #0f261a;
            border: 2px solid #00ff99;
            color: #00ff99;
            padding: 15px 25px;
            border-radius: 8px;
            font-weight: 600;
            box-shadow: 0 0 15px rgba(0, 255, 153, 0.4);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
            z-index: 9999;
        }
        .popup-message.show { opacity: 1; transform: translateY(0); }
        .popup-message b { color: #fff; }
        @media (max-width: 768px) {
            .game-detail-wrapper { flex-direction: column; align-items: center; }
            .game-detail-info h2 { font-size: 32px; text-align: center; }
        }