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

body {
    font-family: Arial, sans-serif;
    transition: background 0.3s, color 0.3s;
}

/* DARK MODE */
body.dark {
    background: #111;
    color: #fff;
}

/* NAVBAR */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: #000;
    padding: 15px 40px;
    display: flex;
    justify-content: space-between;
    z-index: 1000;
}

.navbar ul {
    display: flex;
    gap: 30px;
}

.navbar a {
    color: #fff;
    text-decoration: none;
    position: relative;
}

/* Hover underline animation */
.navbar a::after {
    content: "";
    position: absolute;
    width: 0;
    height: 2px;
    left: 0;
    bottom: -5px;
    background: red;
    transition: width 0.3s;
}

.navbar a:hover::after {
    width: 100%;
}

.navbar a.active {
    color: red;
}

/* HERO */
.hero {
    height: 100vh;
    background: url("https://picsum.photos/1200/700") center/cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-title {
    opacity: 0;
    animation: fadeIn 2s forwards;
}

/* Fade in */
@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* MARQUEE */
.marquee {
    overflow: hidden;
    white-space: nowrap;
    margin: 20px 0;
}

.marquee span {
    display: inline-block;
    animation: marquee 10s linear infinite;
}

@keyframes marquee {
    from { transform: translateX(100%); }
    to { transform: translateX(-100%); }
}

/* BUTTON */
.btn-main {
    padding: 15px 30px;
    background: red;
    color: white;
    border: none;
    cursor: pointer;
    animation: blink 1s infinite;
    transition: transform 0.3s;
}

.btn-main:hover {
    transform: translateY(-5px);
}

@keyframes blink {
    0%,100% { background: red; }
    50% { background: orange; }
}

/* SECTION */
.section {
    padding: 100px 50px;
    text-align: center;
}

/* CARDS */
.card-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
}

.card {
    background: #222;
    padding: 15px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card img {
    width: 200px;
    transition: transform 0.3s;
}

/* Hover card */
.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.6);
}

.card:hover img {
    transform: scale(1.05);
}

/* Scroll reveal */
.hidden {
    opacity: 0;
    transform: translateY(50px);
}

.show {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.6s;
}

/* CURSOR */
.cursor {
    width: 20px;
    height: 20px;
    border: 2px solid red;
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
}
/* FOOTER - LIÊN HỆ */
.footer {
    background: #000;
    color: #fff;
    padding: 60px 20px;
    text-align: center;
    margin-top: 100px;
}

.footer h2 {
    margin-bottom: 15px;
    color: red;
}

.footer p {
    margin: 5px 0;
    font-size: 14px;
}

/* DARK MODE footer */
body.dark .footer {
    background: #111;
}
/* REGISTER SECTION */
.register-section {
    background: #f5f5f5;
    padding: 80px 20px;
    text-align: center;
}

.register-section h2 {
    margin-bottom: 10px;
}

.register-section p {
    margin-bottom: 30px;
    color: #555;
}

/* FORM */
.register-form {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.register-form input {
    padding: 12px;
    width: 250px;
    border: 1px solid #ccc;
    outline: none;
}

.register-form button {
    padding: 12px 25px;
    background: red;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: background 0.3s, transform 0.3s;
}

/* Hover button */
.register-form button:hover {
    background: darkred;
    transform: translateY(-3px);
}

/* Message */
.message {
    margin-top: 15px;
    color: green;
}

/* DARK MODE */
body.dark .register-section {
    background: #1a1a1a;
}

body.dark .register-section p {
    color: #ccc;
}

body.dark .register-form input {
    background: #333;
    color: #fff;
    border: 1px solid #555;
}
/* ================= PREMIUM SERVICES ================= */

.premium-section {
    padding: 100px 20px;
    text-align: center;
    background: #fff;
}

.premium-section .subtitle {
    color: #666;
    margin-bottom: 50px;
}

.premium-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.premium-card {
    background: #f9f9f9;
    padding: 30px 25px;
    width: 280px;
    border-radius: 10px;
    transition: transform 0.4s, box-shadow 0.4s;
}

.premium-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.premium-card h3 {
    margin-bottom: 10px;
}

.price {
    font-size: 20px;
    color: red;
    margin-bottom: 20px;
}

.premium-card ul {
    list-style: none;
    margin-bottom: 25px;
}

.premium-card ul li {
    margin: 8px 0;
}

.premium-card button {
    padding: 12px 25px;
    background: red;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: background 0.3s, transform 0.3s;
}

.premium-card button:hover {
    background: darkred;
    transform: translateY(-3px);
}

.highlight {
    border: 2px solid red;
    transform: scale(1.05);
}

/* DARK MODE */
body.dark .premium-section {
    background: #111;
}

body.dark .premium-card {
    background: #1f1f1f;
}

body.dark .premium-section .subtitle {
    color: #ccc;
}