/* --- Reset & Basic Styles --- */
:root {
    --primary-color: #005fbe;    /* Ngọc Cường Blue */
    --secondary-color: #f39c12; /* Ngọc Cường Orange */
    --accent-color: #ffe082;     /* Light Yellow/Gold accent */

    /* Gradients */
    --gradient-pink-red: linear-gradient(to right, #ff6b6b, #ee5253);
    --gradient-green-teal: linear-gradient(rgb(150, 201, 61), rgb(0, 176, 155)); /* Original */
    --gradient-light: linear-gradient(#fdfdfd, #f0f0f0); /* Lighter */
    --gradient-orange: linear-gradient(to right, #f7b733, var(--secondary-color));
    --gradient-blue: linear-gradient(to bottom, var(--primary-color), #004a9a); /* Vertical Blue */
    --gradient-blue-alt: linear-gradient(to right, #00a1f0, #00b8d4);
    --gradient-yellow: linear-gradient(to right, #ffda79, var(--accent-color));

    --text-light: #ffffff;
    --text-dark: #212529;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --body-font: 'Open Sans', sans-serif;
    --heading-font: 'Open Sans', sans-serif;
    --display-font: 'Anton', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--body-font); line-height: 1.7; color: var(--text-dark); background-color: #fff; /* White background */ font-size: 15px; /* Slightly larger base */ }
.container { width: 90%; max-width: 1140px; margin: 0 auto; padding: 0 15px; }
h1, h2, h3, h4 { font-family: var(--heading-font); font-weight: 700; margin-bottom: 1.2rem; /* More space below headings */ line-height: 1.4; color: var(--primary-color); }
h1 { font-size: 2.6rem; }
h2 { font-size: 2.1rem; text-align: center; margin-bottom: 3rem; /* More space below h2 */ padding-bottom: 0.5rem; position: relative; }
/* Underline effect for h2 */
h2::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 80px; height: 4px; background-color: var(--secondary-color); /* Orange underline */ border-radius: 2px; }
h3 { font-size: 1.5rem; margin-bottom: 1.2rem; color: var(--text-dark); }
h4 { font-size: 1.15rem; margin-bottom: 0.8rem; color: var(--text-dark); font-weight: 600; }
p { margin-bottom: 1rem; color: var(--text-muted); }
a { color: var(--primary-color); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--secondary-color); }
ul, ol { list-style: none; padding: 0; margin: 0; }
img { max-width: 100%; height: auto; display: block; }
section { padding: 60px 0; border-bottom: 1px solid var(--border-color); }
section:last-of-type { border-bottom: none; }
.section-gradient-blue { background-image: var(--gradient-blue); }
.section-gradient-blue h2, .section-gradient-blue h3, .section-gradient-blue p, .section-gradient-blue li, .section-gradient-blue strong { color: var(--text-light); }
.section-gradient-blue h2::after { background-color: var(--accent-color); } /* Yellow underline on blue */
.section-gradient-blue a { color: var(--accent-color); }
.section-gradient-blue a:hover { color: #fff; text-decoration: underline; }
.text-light { color: var(--text-light) !important; }
.text-light-alt { color: #e9ecef !important; }
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.mb-0 { margin-bottom: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0; } /* For accessibility */

/* --- Button Styles --- */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 30px; font-size: 1rem; font-weight: 700; text-align: center; border-radius: 30px; cursor: pointer; transition: all 0.3s ease; border: none; text-transform: uppercase; letter-spacing: 0.5px; line-height: 1.5; box-shadow: 0 4px 10px rgba(0,0,0,0.1); }
.btn i { margin-right: 8px; }
.btn-sm { padding: 8px 18px; font-size: 0.9rem; }
.btn-lg { padding: 15px 40px; font-size: 1.1rem; }
.btn-primary { background-color: var(--primary-color); color: var(--text-light); }
.btn-primary:hover { background-color: #004a9a; color: var(--text-light); transform: translateY(-2px); box-shadow: 0 6px 12px rgba(0, 95, 190, 0.3); }
.btn-secondary { background-color: var(--secondary-color); color: var(--text-light); }
.btn-secondary:hover { background-color: #d35400; color: var(--text-light); transform: translateY(-2px); box-shadow: 0 6px 12px rgba(243, 156, 18, 0.3); }
.btn-outline-primary { background-color: transparent; color: var(--primary-color); border: 2px solid var(--primary-color); }
.btn-outline-primary:hover { background-color: var(--primary-color); color: #fff; }
.btn-outline-light { background-color: transparent; color: var(--text-light); border: 2px solid var(--text-light); }
.btn-outline-light:hover { background-color: var(--text-light); color: var(--primary-color); }

/* CTA Button Styles */
.btn-cta { background-image: var(--gradient-orange); color: #fff; border: 3px solid var(--text-light); border-radius: 40px; box-shadow: 0 5px 15px rgba(243, 156, 18, 0.4); font-family: var(--heading-font); font-weight: bold; }
.btn-cta:hover { transform: scale(1.05); box-shadow: 0 8px 20px rgba(243, 156, 18, 0.5); }
.btn-cta i { margin-right: 10px; }

.btn-cta-secondary { background: var(--gradient-light); color: var(--primary-color); border: 2px solid var(--primary-color); border-radius: 30px; font-weight: bold; box-shadow: 0 4px 10px rgba(0, 95, 190, 0.2); }
.btn-cta-secondary:hover { transform: scale(1.05); box-shadow: 0 6px 15px rgba(0, 95, 190, 0.3); }
.btn-cta-secondary i { margin-right: 8px; color: var(--secondary-color); }


/* --- Header --- */
.site-header { background-color: #fff; padding: 10px 0; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 5px rgba(0,0,0,0.1); transition: box-shadow 0.3s ease; }
.site-header.scrolled { box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.header-container { display: flex; justify-content: space-between; align-items: center; position: relative; }
.header-logo a { display: flex; align-items: center; color: var(--primary-color); font-weight: 700; font-size: 1.3rem; text-decoration: none; }
.header-logo img { height: 45px; /* Adjust logo height */ margin-right: 10px; width: auto; } /* Let width adjust */
.main-nav { display: flex; } /* Visible on desktop */
.main-nav ul { display: flex; list-style: none; margin: 0; padding: 0; }
.main-nav li { margin-left: 10px; /* Spacing */ }
.main-nav a { color: var(--text-dark); font-weight: 600; padding: 10px 12px; border-radius: 5px; font-size: 0.9rem; white-space: nowrap; transition: color 0.3s ease, background-color 0.3s ease; display: flex; align-items: center; }
.main-nav a i { margin-right: 6px; font-size: 1em; color: var(--primary-color); transition: color 0.3s ease; }
.main-nav a:hover, .main-nav a.active { color: var(--primary-color); background-color: rgba(0, 95, 190, 0.08); }
.main-nav a:hover i { color: var(--secondary-color); }
.menu-toggle { display: none; background: none; border: none; font-size: 1.8rem; color: var(--primary-color); cursor: pointer; padding: 5px; z-index: 1001; /* Above nav */ }

/* --- Hero Section --- */
.hero-section { background-size: cover; background-position: center center; position: relative; color: var(--text-light); padding: 100px 0 0 0; overflow: hidden; }
.hero-section .overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: linear-gradient(rgba(0, 95, 190, 0.75), rgba(0, 40, 80, 0.9)); z-index: 1; }
.hero-section .hero-content { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; min-height: 70vh; }
.hero-left { flex-basis: 55%; padding-right: 30px; }
.hero-right { flex-basis: 40%; text-align: center; }
.hero-section .main-title { font-family: var(--display-font); font-size: 7rem; line-height: 1; margin-bottom: 0.5rem; text-shadow: 2px 3px 6px rgba(0,0,0,0.4); }
.hero-section .main-title span { font-size: 5rem; vertical-align: middle; color: var(--accent-color); font-family: var(--display-font); display: inline-block; margin-left: 5px; }
.hero-section .subtitle { font-family: var(--heading-font); font-weight: 700; font-size: 2.4rem; line-height: 1.3; color: #e0f2ff; margin-bottom: 2.5rem; text-shadow: 1px 1px 3px rgba(0,0,0,0.3); }
.hero-features { padding-left: 0; margin-top: 2rem;}
.hero-features li { font-size: 1.15rem; margin-bottom: 1rem; display: flex; align-items: center; color: #e0f2ff; }
.hero-features i { color: var(--secondary-color); margin-right: 12px; font-size: 1.5rem; width: 28px; text-align: center; }
.hero-image { max-width: 100%; animation: pulse 3s infinite ease-in-out; }
.hero-bottom-bar { height: 94px; width: 100%; background-size: cover; background-position: center; position: relative; z-index: 3; margin-top: -1px; /* Slight overlap */ }

/* --- Payment Methods Section --- */
.payment-section { padding-bottom: 80px; /* More padding */}
.payment-section .section-title { border-bottom: 3px solid rgba(255,255,255,0.6); }
.payment-section .section-title::after { display: none; } /* Remove default h2 underline */
.methods-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 35px; /* Increased gap */ }
.method-card { border-radius: 12px; overflow: hidden; box-shadow: 0 8px 20px rgba(0,0,0,0.1); transition: transform 0.3s ease, box-shadow 0.3s ease; background-color: #fff; display: flex; flex-direction: column; }
.method-card:hover { transform: translateY(-10px); box-shadow: 0 12px 30px rgba(0,0,0,0.18); }
.method-icon { text-align: center; padding: 30px 0 10px 0; flex-shrink: 0; }
.method-icon img { max-height: 75px; width: auto; display: inline-block; }
.method-content { padding: 20px; text-align: center; border-radius: 0 0 12px 12px; min-height: 120px; display: flex; flex-direction: column; justify-content: center; flex-grow: 1; }
.method-content h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
.method-content p { font-size: 0.95rem; font-weight: 600; margin-bottom: 0; line-height: 1.3; }
/* Gradient & Text Colors */
.method-content.bg-gradient-light { background-image: var(--gradient-light); color: var(--primary-color); }
.method-content.bg-gradient-light h3 { color: var(--primary-color); }
.method-content.bg-gradient-orange { background-image: var(--gradient-orange); color: #fff; }
.method-content.bg-gradient-orange h3, .method-content.bg-gradient-orange p { color: #fff; text-shadow: 1px 1px 2px rgba(0,0,0,0.2); }
.method-content.bg-gradient-blue-alt { background-image: var(--gradient-blue-alt); color: #fff; }
.method-content.bg-gradient-blue-alt h3, .method-content.bg-gradient-blue-alt p { color: #fff; text-shadow: 1px 1px 2px rgba(0,0,0,0.2); }
.method-content.bg-gradient-yellow { background-image: var(--gradient-yellow); color: #735b03; }
.method-content.bg-gradient-yellow h3 { color: #5a4700; }
.cta-section { margin-top: 60px; }
.cta-title { font-size: 1.8rem; font-weight: bold; margin-bottom: 1.5rem; }

/* --- HD Saison Section --- */
#hd-saison .section-header { margin-bottom: 50px; }
#hd-saison .section-title { background-image: var(--gradient-light); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; font-family: var(--heading-font); font-weight: 700; font-size: 2.5rem; border-bottom: none; }
#hd-saison .section-title::after { display: none; } /* Remove default h2 underline */
.procedure-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 60px; background-color: rgba(255,255,255,0.08); padding: 40px; border-radius: 15px; }
.procedure-col h3 { font-size: 1.7rem; color: var(--text-light); border-bottom: 3px solid var(--secondary-color); padding-bottom: 10px; margin-bottom: 2.5rem; display: flex; align-items: center; }
.procedure-col h3 i { margin-right: 15px; }
.procedure-step { margin-bottom: 2.5rem; }
.procedure-step h4 { font-size: 1.25rem; color: var(--accent-color); margin-bottom: 1rem; font-weight: 700; }
.procedure-step ul { padding-left: 0; margin-top: 1rem;}
.procedure-step ul li { margin-bottom: 0.8rem; display: flex; align-items: center; color: #e0e0e0; }
.procedure-step ul li i { color: var(--secondary-color); margin-right: 12px; width: 24px; text-align: center; }
.procedure-step p { color: #e0e0e0; margin-bottom: 0.8rem;}
.procedure-image { border-radius: 8px; margin: 20px auto; box-shadow: 0 4px 10px rgba(0,0,0,0.2); max-width: 90%; }
.payment-channels-image { border-radius: 8px; margin: 15px 0; background: #fff; padding: 15px; box-shadow: 0 3px 8px rgba(0,0,0,0.1); }

.important-notes { margin-top: 60px; background-color: rgba(0,0,0,0.2); padding: 35px; border-radius: 10px; border-left: 7px solid var(--secondary-color); }
.important-notes h3 { color: var(--secondary-color); font-size: 1.6rem; margin-bottom: 2rem; display: flex; align-items: center;}
.important-notes h3 i { margin-right: 15px; }
.important-notes ol { padding-left: 35px; counter-reset: notes-counter; }
.important-notes li { margin-bottom: 1.2rem; color: #e0e0e0; position: relative; padding-left: 20px; list-style: none; line-height: 1.8; }
.important-notes li::before { counter-increment: notes-counter; content: counter(notes-counter); font-weight: bold; color: var(--accent-color); position: absolute; left: -20px; background-color: rgba(255,255,255,0.15); border-radius: 50%; width: 25px; height: 25px; text-align: center; line-height: 25px; font-size: 0.9em; }
.important-notes strong { color: #ffffff; font-weight: 600; }
.thank-you-note { margin-top: 2rem; color: #c0c0c0; text-align: center; margin-bottom: 0; font-size: 1rem; }
#hd-saison .cta-section { margin-top: 50px; }
#hd-saison .cta-title { color: var(--text-light-alt); font-size: 1.6rem; }

/* --- Footer Section --- */
.footer-section { background-color: #2a3035; /* Slightly lighter dark */ color: #ced4da; padding: 60px 0 25px 0; font-size: 0.95rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 45px; margin-bottom: 45px; }
.footer-column h4 { color: #fff; margin-bottom: 1.8rem; font-size: 1.15rem; position: relative; padding-bottom: 1rem; text-transform: uppercase; letter-spacing: 1px; }
.footer-column h4::after { content: ''; position: absolute; left: 0; bottom: 0; width: 60px; height: 3px; background-color: var(--primary-color); border-radius: 1.5px; }
.footer-column h4 i { margin-right: 10px; width: 20px; text-align: center; }
.footer-column p, .footer-column li { margin-bottom: 1rem; color: #e0e0e0; line-height: 1.8; }
.footer-column a { color: #e0e0e0; }
.footer-column a:hover { color: #fff; text-decoration: underline; }
.footer-column strong { color: #f8f9fa; }
.footer-column ul li { padding-left: 0; }
.footer-column ul li a i { margin-right: 8px; font-size: 0.8rem; color: var(--primary-color); width: 15px; text-align: center; }
.footer-column .support-list { margin-top: 5px; padding-left: 0; }
.footer-column .support-list li { margin-bottom: 0.6rem; }
.social-icons-footer { margin-top: 1.2rem; }
.social-icons-footer a { color: #e0e0e0; font-size: 2rem; margin-right: 20px; transition: color 0.3s ease, transform 0.3s ease; display: inline-block; }
.social-icons-footer a:hover { color: var(--primary-color); transform: translateY(-3px); }
.footer-bottom { text-align: center; padding-top: 30px; border-top: 1px solid #495057; font-size: 0.9rem; color: #adb5bd; }
.footer-bottom a { color: #ced4da; font-weight: 600; }

/* --- Floating Action Buttons --- */
.floating-cta { position: fixed; bottom: 25px; width: 60px; height: 60px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.9rem; box-shadow: 0 6px 18px rgba(0,0,0,0.3); z-index: 999; transition: transform 0.3s ease, background-color 0.3s ease; text-decoration: none; color: #fff; border: 2px solid rgba(255,255,255,0.5); }
.floating-cta:hover { transform: scale(1.1); }
.phone-cta { right: 25px; background-color: var(--secondary-color); }
.phone-cta:hover { background-color: #d35400; }
.zalo-cta { right: 100px; background-color: #0068ff; padding: 12px; /* Adjust padding for SVG */ }
.zalo-cta svg { width: 30px; height: 30px; fill: #fff; }
.zalo-cta:hover { background-color: #0053cc; }

/* --- Animations --- */
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.05); } }
.hero-image { animation: pulse 3s infinite ease-in-out; }

/* --- Responsive --- */
@media (max-width: 1024px) {
     .main-nav a { padding: 10px 8px; font-size: 0.85rem;} /* Slightly smaller nav links */
     .main-nav li { margin-left: 5px;}
}
@media (max-width: 992px) {
    h1 { font-size: 2.4rem; } h2 { font-size: 1.9rem; }
    .hero-section .hero-content { flex-direction: column; text-align: center; padding-bottom: 50px; }
    .hero-left, .hero-right { max-width: 100%; padding-right: 0; }
    .hero-right { margin-top: 40px; }
    .hero-section .main-title { font-size: 5rem; }
    .hero-section .subtitle { font-size: 1.8rem; max-width: 600px; margin-left: auto; margin-right: auto;}
    .hero-features { display: inline-block; text-align: left; }
    .procedure-grid { grid-template-columns: 1fr; gap: 40px; } /* Stack procedure */
}
@media (max-width: 768px) {
    body { padding-top: 0; font-size: 14px;}
    .site-header { position: relative; /* Make static on mobile */ padding: 10px 0; }
    .header-container { position: static; /* Reset position for menu */ }
    .main-nav {
        display: none; /* Hide nav by default on mobile */
        position: absolute;
        top: 100%; left: 0; right: 0; /* Full width */
        width: auto; /* Let it be full width */
        background-color: #fff;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        padding: 10px 0;
        border-top: 1px solid var(--border-color);
        z-index: 1100; /* Ensure it's above other content */
    }
    .main-nav.is-active { display: flex; /* Show when active */ }
    .main-nav ul { flex-direction: column; align-items: stretch; }
    .main-nav li { margin: 0; width: 100%; }
    .main-nav a { padding: 15px 20px; border-bottom: 1px solid #eee; justify-content: flex-start; border-radius: 0; font-size: 1rem; }
    .main-nav li:last-child a { border-bottom: none; }
    .menu-toggle { display: block; } /* Show toggle button */

    h1 { font-size: 2rem; } h2 { font-size: 1.6rem; } h3 { font-size: 1.3rem; }
    section { padding: 40px 0; }
    .hero-section { padding: 60px 0 0 0; min-height: auto; }
    .hero-section .main-title { font-size: 3.5rem; }
    .hero-section .main-title span { font-size: 2.5rem; }
    .hero-section .subtitle { font-size: 1.5rem; }
    .hero-features li { font-size: 1rem; }
    .hero-bottom-bar { height: 60px; }
    .methods-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px;}
    .footer-grid { grid-template-columns: 1fr; }
    .footer-column { margin-bottom: 30px; }
    .floating-cta { width: 50px; height: 50px; font-size: 1.6rem; bottom: 20px; }
    .phone-cta { right: 20px; }
    .zalo-cta { right: 85px; padding: 8px;}
    .zalo-cta svg { width: 26px; height: 26px;}
}
@media (max-width: 480px) {
    .hero-section .main-title { font-size: 3rem; }
    .hero-section .main-title span { font-size: 2.2rem; }
    .hero-section .subtitle { font-size: 1.3rem; }
    .btn-lg { padding: 12px 30px; font-size: 1rem; }
    .methods-grid { grid-template-columns: 1fr; }
    .important-notes ol { padding-left: 25px; }
    .important-notes li::before { left: -15px; width: 22px; height: 22px; line-height: 22px;}
}