/* --- 1. CẤU HÌNH CHUNG --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007bff;
    --dark-color: #1a1a1a;
    --text-muted: #6c757d;
    --transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

body {
    font-family: "Inter", sans-serif;
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
    background-color: #ffffff;
    background-image: 
        radial-gradient(at 0% 0%, rgba(0, 123, 255, 0.05) 0px, transparent 50%), 
        radial-gradient(at 100% 100%, rgba(255, 0, 150, 0.03) 0px, transparent 50%),
        url("https://www.toptal.com/designers/subtlepatterns/patterns/double-bubble-outline.png");
    background-attachment: fixed;
}

/* ------------------ 2. NAVIGATION BAR ------------------ */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 6%;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 25px rgba(0,0,0,0.06);
}

.logo-img {
    width: 120px;
    height: auto;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.logo-img:hover { transform: scale(1.15); }

.menu ul { 
    display: flex; 
    align-items: center; 
    gap: 25px; 
    list-style: none; 
    padding: 0; 
    margin: 0; 
}

.nav-button {
    text-decoration: none;
    color: var(--dark-color);
    margin-left: 30px; /* Trả lại margin để không bị thụt */
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition);
    position: relative;
    padding: 5px 0; /* Trả lại padding gốc */
    background: none;
    border: none;
    outline: none;
    cursor: pointer;
    display: inline-block;
}

.nav-button::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 15px;
    right: 15px;
    background: linear-gradient(90deg, #007bff, #00c6ff);
    transition: var(--transition);
}

.nav-button:hover { color: var(--primary-color); }
.nav-button:hover::after { width: calc(100% - 30px); bottom: -3px; }

/* ---------------------- 3. DROPDOWN ------------------------- */
.dropdown { position: relative; }

.dropdown-content {
    display: block;
    opacity: 0;
    visibility: hidden; 
    transform: translateY(10px);
    transition: var(--transition);
    position: absolute;
    background-color: white;
    min-width: 150px;
    border-radius: 10px;
    box-shadow: 0px 10px 25px rgba(0,0,0,0.1);
    overflow: hidden;
    top: 100%;
    left: 15px;
}

.dropdown-content a {
    display: block;
    padding: 12px 15px;
    color: #333;
    text-decoration: none;
    transition: all 0.3s ease;
}

.dropdown-content a:hover {
    background: rgba(0,123,255,0.08);
    color: var(--primary-color);
    transform: translateX(5px);
}

.dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ---------------- 4. HERO SECTION ------------------- */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-image-wrapper { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 0; }

.hero-image-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.5);
    transform: scale(1.05);
    opacity: 0;
    animation: fadeVideo 1.5s ease forwards;
}

.hero-text {
    position: relative;
    text-align: center;
    color: #fff;
    max-width: 800px;
    padding: 40px;
    z-index: 1;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(3px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(32px, 6vw, 75px); /* Tối ưu lại size để không bị lỗi trên mobile */
    text-transform: uppercase;
    letter-spacing: 6px;
    font-weight: 800;
    margin-bottom: 10px;
    animation: fadeInUp 1s ease;
}

.hero-sub-hero {
    font-size: clamp(12px, 1.8vw, 18px);
    font-weight: 300;
    letter-spacing: 4px;
    text-transform: uppercase;
    opacity: 0.9;
    animation: fadeInUp 1.2s ease;
}

.divider { 
    width: 80px; 
    height: 3px; 
    background: var(--primary-color); 
    margin: 20px auto; 
}

/* --- 5. CHI TIẾT NỘI DUNG (BENEFITS & IMAGE FRAME) --- */
#experience {
    background-color: transparent;
}

.video-frame {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    border: 8px solid #fff;
    transition: transform 0.4s ease;
}

.video-frame:hover {
    transform: scale(1.02);
}

.video-frame video {
    display: block;
    object-fit: cover;
    min-height: 400px;
}

.narrative-text {
    position: relative;
    padding-left: 0;
}

.accent-line {
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.narrative-text p {
    margin-bottom: 20px;
}

/*----------------------- STATISTIC NUMBER -------------------------*/
.statistics-section {
    padding: 80px 0;
    text-align: center;
    background: #f8f9fa;
}

.row-stats {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
}

.stat-card {
    flex: 1;
    min-width: 250px;
    padding: 40px 30px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-10px);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: #007bff;
    margin-bottom: 10px;
    font-family: 'Inter', sans-serif;
}

.stat-card p {
    color: #666;
    font-size: 1.1rem;
    line-height: 1.5;
    margin-bottom: 0;
}

/*----------------------- OVERVIEW SECTION (Dành cho phần bị ẩn nếu mở lại) -------------------------*/
.overview-section {
    background: transparent !important;
    position: relative;
    overflow: hidden;
    padding: 80px 0;
}

.bg-blur {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 0;
}
.blur-1 {
    top: -10%; left: -5%;
    width: 400px; height: 400px;
    background: rgba(0, 123, 255, 0.05);
}
.blur-2 {
    bottom: -10%; right: -5%;
    width: 300px; height: 300px;
    background: rgba(255, 0, 150, 0.05);
}

.content-wrapper { position: relative; z-index: 1; }
.sub-title {
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.8rem;
    color: #007bff;
    font-weight: 700;
    display: block;
    margin-bottom: 10px;
}
.main-title { font-family: 'Playfair Display', serif; color: #1a1a1a; font-weight: 700; }
.description { max-width: 600px; margin: 15px auto; color: #6c757d; font-size: 1.1rem; line-height: 1.6; }
.custom-carousel { border-radius: 30px; box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15); overflow: hidden; }
.carousel-inner img { height: 550px; object-fit: cover; }
.img-container { position: relative; }
.img-overlay { position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(transparent, rgba(0,0,0,0.7)); height: 40%; pointer-events: none; }
.custom-control { background-color: rgba(0,0,0,0.3) !important; padding: 25px; border-radius: 50%; background-size: 50%; }
.carousel-indicators button { width: 12px !important; height: 12px !important; border-radius: 50% !important; margin: 0 5px !important; }

.btn-book-now {
    display: inline-block;
    padding: 15px 50px;
    background: linear-gradient(45deg, #007bff, #00c6ff);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 10px 20px rgba(0, 123, 255, 0.3);
    transition: transform 0.3s ease;
}
.btn-book-now:hover { transform: translateY(-3px); color: white; }

/* --- PARTNER SECTION --- */
.partner-section {
    margin-top: 80px;
    padding: 60px 20px;
    background-color: rgba(255, 255, 255, 0.6); 
    backdrop-filter: blur(10px); 
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    text-align: center;
}
.partner-title { letter-spacing: 4px; color: #adb5bd; font-size: 12px; font-weight: bold; text-transform: uppercase; margin-bottom: 40px; }
.partner-img { display: block; margin: 0 auto; width: 100%; max-width: 800px; height: auto; object-fit: contain; opacity: 0.7; transition: opacity 0.3s ease; }
.partner-img:hover { opacity: 1; }

/* --- 6. FOOTER --- */
footer {
    background: var(--dark-color);
    color: #fff;
    padding: 40px 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

footer p {
    font-size: 0.85rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 1px;
    margin: 0;
}
footer strong { color: var(--primary-color); }

/* --- 7. ANIMATIONS & RESPONSIVE --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeVideo {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* --- RESPONSIVE MOBILE MENU --- */
.hamburger {
    display: none;
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    color: #333;
}

@media (max-width: 992px) {
    .hamburger { display: block; }

    .menu {
        display: none; 
        position: absolute;
        top: 100%; /* Đảm bảo nằm ngay dưới thanh nav */
        left: 0;
        width: 100%;
        background: #fff; /* Nên để màu trắng đục hoặc trắng hoàn toàn để dễ đọc */
        padding: 20px 0;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        flex-direction: column;
        align-items: center;
        z-index: 1000;
    }

    .menu.active { 
        display: flex !important; 
    }
    
    .menu ul { 
        flex-direction: column; /* Xếp dọc */
        gap: 20px;              /* Tạo khoảng cách giữa các chữ */
        width: 100%;
        align-items: center;
        padding: 0;
    }

    .nav-button { 
        margin-left: 0; 
        font-size: 1.2rem; /* Tăng size chữ cho dễ bấm trên mobile */
    }
}