:root {
    --primary-color: #2c2c2c;
    --secondary-color: #f5f1e8;
    --accent-color: #d4a574;
    --text-dark: #2c2c2c;
    --text-light: #666;
    --white: #fff;
}

* { box-sizing: border-box; }
html { width: 100%; scroll-behavior: smooth; }
body { width: 100%; margin: 0; overflow-x: hidden; color: var(--text-dark); font-family: Inter, sans-serif; line-height: 1.6; }
h1, h2, h3, h4, h5, h6 { margin-top: 0; margin-bottom: 1rem; font-family: 'Playfair Display', serif; font-weight: 500; line-height: 1.2; }
img { max-width: 100%; }
a { transition: color .25s, background-color .25s, border-color .25s, transform .25s; }

.navbar { padding: 1.35rem 0; background: transparent; transition: padding .3s, background .3s, box-shadow .3s; }
.navbar.scrolled { padding: .9rem 0; background: rgba(255,255,255,.96); box-shadow: 0 2px 20px rgba(0,0,0,.1); backdrop-filter: blur(10px); }
.navbar-brand { color: var(--white); font-family: 'Playfair Display', serif; font-weight: 600; text-decoration: none; }
.navbar.scrolled .navbar-brand, .navbar.scrolled .nav-link { color: var(--primary-color); }
.brand-text { display: block; font-size: 1.5rem; letter-spacing: .1em; line-height: 1; }
.brand-subtitle { display: block; margin-top: .2rem; font-size: .7rem; font-weight: 300; letter-spacing: .2em; opacity: .82; }
.navbar-nav .nav-link { position: relative; margin: 0 .8rem; color: var(--white); font-size: .92rem; font-weight: 500; }
.navbar-nav .nav-link::after { content: ''; position: absolute; bottom: 0; left: 50%; width: 0; height: 2px; background: var(--accent-color); transform: translateX(-50%); transition: width .25s; }
.navbar-nav .nav-link:hover::after { width: 100%; }
.navbar-toggler { position: relative; width: 30px; height: 22px; padding: 0; border: 0; background: transparent !important; }
.navbar-toggler:focus { box-shadow: 0 0 0 .2rem rgba(212,165,116,.35); }
.navbar-toggler-icon { position: relative; display: block; width: 100%; height: 2px; background: var(--white); background-image: none !important; transition: background .25s; }
.navbar-toggler-icon::before, .navbar-toggler-icon::after { content: ''; position: absolute; left: 0; width: 100%; height: 2px; background: inherit; transition: transform .25s, top .25s, bottom .25s; }
.navbar-toggler-icon::before { top: -8px; }
.navbar-toggler-icon::after { bottom: -8px; }
.navbar.scrolled .navbar-toggler-icon { background: var(--primary-color); }
.navbar-toggler[aria-expanded='true'] .navbar-toggler-icon { background: transparent; }
.navbar-toggler[aria-expanded='true'] .navbar-toggler-icon::before { top: 0; background: var(--white); transform: rotate(45deg); }
.navbar-toggler[aria-expanded='true'] .navbar-toggler-icon::after { bottom: 0; background: var(--white); transform: rotate(-45deg); }
.offcanvas { z-index: 100000 !important; color: var(--white); background: var(--primary-color); }
.offcanvas-title { color: var(--white); }
.offcanvas-header .btn-close { filter: invert(1); }
.offcanvas .nav-link { margin: 0; padding: 1rem 0; color: var(--white); border-bottom: 1px solid rgba(255,255,255,.12); }
.top-signup-button { display: inline-flex; min-height: 44px; padding: .65rem 1.1rem; align-items: center; justify-content: center; color: var(--primary-color); background: var(--accent-color); border: 1px solid var(--accent-color); border-radius: 999px; font-size: .82rem; font-weight: 700; letter-spacing: .04em; line-height: 1; text-decoration: none; text-transform: uppercase; }
.top-signup-button:hover { color: var(--white); background: transparent; }
.navbar.scrolled .top-signup-button { color: var(--white); }
.navbar.scrolled .top-signup-button:hover { color: var(--primary-color); background: transparent; }

.hero-section { position: relative; display: flex; height: 100vh; min-height: 650px; align-items: center; overflow: hidden; }
.hero-background { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; background-position: 60% center; background-size: cover; background-repeat: no-repeat; will-change: transform; }
.hero-overlay { position: absolute; inset: 0; z-index: -1; }
.hero-title { max-width: 760px; margin-bottom: 1.4rem; color: var(--white); font-size: clamp(3rem, 5vw, 4.5rem); font-weight: 600; line-height: 1.08; }
.hero-subtitle { max-width: 650px; margin-bottom: 2rem; color: rgba(255,255,255,.9); font-size: 1.18rem; line-height: 1.65; }
.hero-buttons { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.5rem; }
.hero-age-note { margin-top: 1.1rem; color: rgba(255,255,255,.85); font-size: .9rem; }
.accent-text { color: var(--accent-color); }
.btn { display: inline-block; padding: .85rem 1.75rem; border: 2px solid transparent; border-radius: 20px; font-weight: 600; letter-spacing: .04em; text-decoration: none; text-transform: uppercase; }
.btn-primary { color: var(--white); background: var(--accent-color); border-color: var(--accent-color); }
.btn-primary:hover { color: var(--accent-color); background: transparent; border-color: var(--accent-color); }
.btn-outline { color: var(--white); background: transparent; border-color: var(--white); }
.btn-outline:hover { color: var(--primary-color); background: var(--white); }
.scroll-indicator { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); }
.scroll-arrow { position: relative; width: 2px; height: 38px; background: var(--white); animation: scrollBounce 2s infinite; }
.scroll-arrow::after { content: ''; position: absolute; bottom: 0; left: -4px; width: 10px; height: 10px; border-right: 2px solid var(--white); border-bottom: 2px solid var(--white); transform: rotate(45deg); }
@keyframes scrollBounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(8px); } }

.section-padding { padding: 6rem 0; }
.section-header { margin-bottom: 4rem; }
.section-subtitle { display: block; margin-bottom: .9rem; color: var(--accent-color); font-size: .82rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase; }
.section-title { margin-bottom: 1.25rem; font-size: clamp(2.15rem, 4vw, 3rem); font-weight: 600; }
.section-description { max-width: 650px; margin: 0 auto; color: var(--text-light); font-size: 1.08rem; }
.bg-light { background: var(--secondary-color) !important; }
.bg-dark { background: var(--primary-color) !important; }

.about-image { overflow: hidden; border-radius: 8px; }
.about-image img { width: 100%; transition: transform .5s; }
.about-image:hover img { transform: scale(1.03); }
.stats-row { display: flex; gap: 1.5rem; margin-top: 2rem; }
.stat-item { text-align: center; }
.stat-item h3 { margin-bottom: .35rem; color: var(--accent-color); font-size: 2.2rem; font-weight: 600; }
.stat-item p { margin: 0; color: var(--text-light); }

.service-card { height: 100%; padding: 2.3rem 1.8rem; text-align: center; background: var(--white); border: 1px solid rgba(0,0,0,.06); border-radius: 10px; transition: transform .3s, box-shadow .3s; }
.service-card:hover { transform: translateY(-6px); box-shadow: 0 18px 38px rgba(0,0,0,.09); }
.service-icon { width: 82px; height: 82px; margin: 0 auto 1.4rem; overflow: hidden; border-radius: 50%; }
.service-icon img { width: 100%; height: 100%; object-fit: cover; }
.service-card h3 { color: var(--primary-color); font-size: 1.4rem; }
.service-card p { margin-bottom: 0; color: var(--text-light); }

.process-step { padding: 2rem 1rem; color: var(--white); text-align: center; }
.step-number { position: relative; margin-bottom: 1.1rem; color: var(--accent-color); font-family: 'Playfair Display', serif; font-size: 3rem; font-weight: 600; }
.step-number::after { content: ''; position: absolute; bottom: -.45rem; left: 50%; width: 38px; height: 2px; background: var(--accent-color); transform: translateX(-50%); }
.process-step h4 { color: var(--white); font-size: 1.4rem; }
.process-step p { color: rgba(255,255,255,.78); }

.testimonial-card { height: 100%; padding: 2.3rem 1.8rem; text-align: center; background: var(--white); border-radius: 10px; box-shadow: 0 10px 28px rgba(0,0,0,.06); }
.testimonial-content { margin-bottom: 1.5rem; }
.testimonial-content p { margin: 0; color: var(--text-dark); font-size: 1.04rem; font-style: italic; line-height: 1.7; }
.testimonial-author { display: flex; align-items: center; justify-content: center; gap: .9rem; }
.testimonial-author img { width: 58px; height: 58px; border-radius: 50%; object-fit: cover; }
.testimonial-author h5 { margin: 0; color: var(--primary-color); font-size: 1.05rem; }
.testimonial-author span { color: var(--text-light); font-size: .85rem; }

.blog-card { height: 100%; overflow: hidden; background: var(--white); border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,.06); transition: transform .3s, box-shadow .3s; }
.blog-card:hover { transform: translateY(-5px); box-shadow: 0 18px 40px rgba(0,0,0,.1); }
.blog-image { height: 270px; overflow: hidden; }
.blog-image a { display: block; width: 100%; height: 100%; }
.blog-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.blog-card:hover .blog-image img { transform: scale(1.04); }
.blog-content { padding: 2rem; }
.blog-meta { display: flex; flex-wrap: wrap; gap: .8rem; margin-bottom: .9rem; }
.blog-category, .blog-date { color: var(--text-light); font-size: .82rem; font-weight: 500; }
.blog-category { color: var(--accent-color); }
.blog-content h3 { color: var(--primary-color); font-size: 1.55rem; }
.blog-content p { color: var(--text-light); }
.blog-link { color: var(--accent-color); font-weight: 600; text-decoration: none; border-bottom: 2px solid var(--accent-color); }
.blog-link:hover { color: var(--primary-color); border-color: var(--primary-color); }

.accordion-item { border-color: rgba(44,44,44,.12); }
.accordion-button:not(.collapsed) { color: var(--primary-color); background: var(--secondary-color); box-shadow: none; }
.accordion-button:focus { border-color: var(--accent-color); box-shadow: 0 0 0 .2rem rgba(212,165,116,.2); }

.registration-cta { position: relative; overflow: hidden; color: var(--white); background: linear-gradient(120deg, rgba(24,20,18,.96), rgba(74,48,34,.88)), url('../images/Vietnam9377-optimized.webp') center/cover no-repeat; }
.registration-cta::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 50% 15%, rgba(212,165,116,.24), transparent 42%); }
.registration-lead { max-width: 720px; margin: 0 auto; color: rgba(255,255,255,.82); font-size: 1.15rem; }
.registration-choice { display: flex; min-height: 245px; padding: 2rem; flex-direction: column; color: var(--white); text-decoration: none; background: rgba(255,255,255,.09); border: 1px solid rgba(255,255,255,.22); border-radius: 16px; backdrop-filter: blur(10px); }
.registration-choice:hover { color: var(--white); background: rgba(212,165,116,.16); border-color: var(--accent-color); transform: translateY(-5px); }
.registration-choice .choice-eyebrow { color: rgba(255,255,255,.65); font-size: .75rem; letter-spacing: .16em; text-transform: uppercase; }
.registration-choice strong { margin: .35rem 0 .8rem; color: var(--accent-color); font-family: 'Playfair Display', serif; font-size: 2rem; }
.registration-choice b { margin-top: auto; padding-top: 1.5rem; color: var(--white); }
.registration-trust { display: flex; margin-top: 2rem; flex-wrap: wrap; justify-content: center; gap: .8rem 2rem; color: rgba(255,255,255,.88); font-size: .92rem; }
.registration-policy { max-width: 760px; margin: 1.25rem auto 0; color: rgba(255,255,255,.58); font-size: .78rem; text-align: center; }

.footer { padding: 4rem 0 2rem; color: var(--white); }
.footer-brand { margin-bottom: 1.2rem; }
.footer-description { max-width: 420px; color: rgba(255,255,255,.76); }
.footer h5 { color: var(--white); font-weight: 600; }
.footer-links { margin: 0; padding: 0; list-style: none; }
.footer-links li { margin-bottom: .55rem; }
.footer-links a { color: rgba(255,255,255,.7); text-decoration: none; }
.footer-links a:hover { color: var(--accent-color); }
.footer-divider { margin: 2rem 0 1.5rem; border-color: rgba(255,255,255,.2); }
.footer-copyright { margin: 0; color: rgba(255,255,255,.65); }

.scroll-to-top { position: fixed; right: 30px; bottom: 30px; z-index: 1000; display: flex; width: 48px; height: 48px; align-items: center; justify-content: center; color: var(--white); background: var(--accent-color); border: 0; border-radius: 50%; box-shadow: 0 4px 12px rgba(0,0,0,.15); opacity: 0; visibility: hidden; transition: opacity .25s, visibility .25s, transform .25s; }
.scroll-to-top.show { opacity: 1; visibility: visible; }
.scroll-to-top:hover { background: var(--primary-color); transform: translateY(-3px); }
[data-aos].aos-animate { pointer-events: auto; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--secondary-color); }
::-webkit-scrollbar-thumb { background: var(--accent-color); border-radius: 4px; }

@media (max-width: 991.98px) {
    .navbar { padding: 1rem 0; }
    .navbar-toggler, .offcanvas-header .btn-close { width: 44px; height: 44px; }
    .navbar-toggler { display: inline-flex; align-items: center; justify-content: center; }
    .navbar-toggler-icon { width: 30px; }
    .offcanvas-header .btn-close { box-sizing: border-box; margin: -.5rem; padding: 14px; background-size: 16px; }
    .navbar-nav .nav-link { margin: 0; color: var(--white) !important; }
    .navbar-nav .nav-link::after { display: none; }
    .hero-title { font-size: clamp(2.7rem, 8vw, 3.7rem); }
    .stats-row { gap: 1rem; }
}

@media (max-width: 767.98px) {
    .hero-section { min-height: 620px; }
    .hero-title { font-size: clamp(2.25rem, 10vw, 3rem); }
    .hero-subtitle { font-size: 1rem; line-height: 1.55; }
    .hero-buttons { display: grid; grid-template-columns: 1fr; max-width: 330px; }
    .hero-buttons .btn { width: 100%; }
    .scroll-indicator { display: none; }
    .section-padding { padding: 3.5rem 0; }
    .section-header { margin-bottom: 2.2rem; }
    .section-title { font-size: 2rem; }
    .stats-row { flex-wrap: wrap; }
    .stat-item { flex: 1 1 30%; }
    .blog-image { height: 240px; }
    .blog-link, .footer-links a { display: inline-flex; min-height: 44px; align-items: center; padding-block: 10px; }
    .footer-links li { margin-bottom: 0; }
    .registration-choice { min-height: 220px; }
    .scroll-to-top { right: 20px; bottom: 20px; width: 44px; height: 44px; }
}

@media (max-width: 575.98px) {
    .article-top-links { gap: .65rem; }
    .article-top-links .article-guide-link { display: none; }
    .article-top-links .article-home-link { font-size: .72rem; letter-spacing: .03em; }
    .top-signup-button { min-height: 44px; padding: .6rem .85rem; font-size: .72rem; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}