:root {
    --bg: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #2d1b69 100%);
    --accent: #ffffff;
    --text-dim: #888888;
    --glass: rgba(255, 255, 255, 0.02);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
body {
    background-color: #0f172a;
    color: var(--accent);
    scroll-behavior: smooth;
    overflow-x: hidden;
    background-image: url('https://images.unsplash.com/photo-1552664730-d307ca884978?w=1920&h=1080&fit=crop');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 27, 75, 0.85) 50%, rgba(45, 27, 105, 0.85) 100%);
    z-index: -1;
    pointer-events: none;
}

/* BACKGROUND SYSTEM */
.bg-wrapper { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; overflow: hidden; background: transparent; }
.bg-grid { display: none; }
.glow-blob { display: none; }

/* Navigation */
.navbar { position: fixed; top: 0; width: 100%; display: flex; justify-content: space-between; padding: 20px 8%; align-items: center; z-index: 1000; transition: 0.4s; background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(255, 255, 255, 0.07); }
.logo { font-weight: 800; font-size: 1.25rem; color: #fff; text-decoration: none; letter-spacing: -0.5px; }
.logo span { color: rgba(255,255,255,0.45); }
.nav-links { display: flex; list-style: none; gap: 32px; }
.nav-links a { text-decoration: none; color: rgba(255,255,255,0.55); font-size: 0.88rem; font-weight: 500; transition: color 0.25s; letter-spacing: 0.01em; }
.nav-links a:hover { color: #fff; }
.btn-small { background: #fff; color: #000; padding: 9px 22px; border-radius: 22px; text-decoration: none; font-weight: 700; font-size: 0.8rem; letter-spacing: 0.01em; transition: background 0.2s, transform 0.2s; }
.btn-small:hover { background: #e8e8e8; transform: translateY(-1px); }

/* Hero Section */
.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 140px 8% 80px 8%; }
.hero-content { display: flex; flex-direction: column; align-items: center; }
h1 { font-size: 5rem; font-weight: 800; letter-spacing: -2.5px; line-height: 1.05; }
.gradient-text {
    background: linear-gradient(90deg, #ffffff 0%, #888888 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}
.sub-headline { color: rgba(255,255,255,0.5); font-size: 1.15rem; margin: 24px auto 44px; max-width: 560px; line-height: 1.7; font-weight: 400; }
.hero-btns { margin-bottom: 60px; }
.btn-main { background: #fff; color: #000; padding: 18px 48px; border-radius: 40px; text-decoration: none; font-weight: 700; font-size: 1rem; transition: all 0.25s; display: inline-block; letter-spacing: -0.01em; }
.btn-main:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 8px 40px rgba(255,255,255,0.18); }

/* Trusted By */
.trusted { padding: 72px 8% 80px; text-align: center; position: relative; }
.trusted::before, .trusted::after { content: ''; position: absolute; left: 8%; right: 8%; height: 1px; background: linear-gradient(to right, transparent, rgba(255,255,255,0.07), transparent); }
.trusted::before { top: 0; }
.trusted::after { bottom: 0; }
.trusted-label { font-size: 0.68rem; font-weight: 600; letter-spacing: 0.25em; text-transform: uppercase; color: rgba(255,255,255,0.25); margin-bottom: 52px; }
.brands-row { display: flex; justify-content: center; align-items: center; gap: 52px; flex-wrap: wrap; }
.brand-wrap { position: relative; display: flex; flex-direction: column; align-items: center; cursor: default; }
.brand-wrap::after { content: attr(data-name); position: absolute; bottom: -26px; left: 50%; transform: translateX(-50%) translateY(4px); font-size: 0.62rem; font-weight: 600; letter-spacing: 0.1em; color: rgba(255,255,255,0); white-space: nowrap; transition: color 0.3s, transform 0.3s; pointer-events: none; }
.brand-wrap:hover::after { color: rgba(255,255,255,0.35); transform: translateX(-50%) translateY(0); }
.brand-logo { width: 46px; height: 46px; object-fit: contain; filter: grayscale(100%) brightness(0.18) contrast(0.9); transition: filter 0.4s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1); user-select: none; }
.brand-wrap:hover .brand-logo { filter: grayscale(0%) brightness(1.05); transform: scale(1.28) translateY(-4px); }

/* Scroll Reveal */
section { opacity: 0; transform: translateY(50px) scale(0.95); filter: blur(4px); transition: opacity 0.8s cubic-bezier(0.34, 1.56, 0.64, 1), transform 0.8s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.8s ease-out; }
section.visible { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }

/* Features */
.features { padding: 100px 8%; max-width: 1200px; margin: 0 auto; }
.features-list { display: flex; flex-direction: column; }
.feature-item { padding: 52px 0; border-bottom: 1px solid rgba(255,255,255,0.06); opacity: 0; transform: translateY(50px); transition: opacity 0.7s cubic-bezier(0.34, 1.56, 0.64, 1), transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1); }
.feature-item:first-child { border-top: 1px solid rgba(255,255,255,0.06); }
.feature-item.visible { opacity: 1; transform: translateY(0); }
.feature-item:hover .feature-name { opacity: 0.45; letter-spacing: -2px; }
.feature-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.feature-num { font-size: 0.72rem; color: rgba(255,255,255,0.25); font-weight: 700; letter-spacing: 3px; }
.feature-count { font-size: 0.78rem; color: #ccc; font-weight: 700; letter-spacing: 1px; background: rgba(255,255,255,0.07); border: 1px solid rgba(255,255,255,0.12); padding: 5px 14px; border-radius: 20px; }
.feature-name { font-size: 3.5rem; font-weight: 800; letter-spacing: -1px; line-height: 1.1; color: #fff; margin-bottom: 20px; transition: opacity 0.4s ease, letter-spacing 0.4s ease; }
.feature-stack { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.tech-item { display: flex; flex-direction: column; gap: 8px; padding: 20px 24px 20px 0; border-top: 1px solid rgba(255,255,255,0.06); border-right: 1px solid rgba(255,255,255,0.04); transition: border-color 0.3s; }
.tech-item:last-child { border-right: none; padding-right: 0; }
.feature-item:hover .tech-item { border-top-color: rgba(255,255,255,0.1); }
.tech-name { font-size: 0.7rem; font-weight: 700; color: #fff; letter-spacing: 2px; text-transform: uppercase; }
.tech-desc { font-size: 0.83rem; color: rgba(255,255,255,0.38); line-height: 1.6; transition: color 0.3s; }
.feature-item:hover .tech-desc { color: rgba(255,255,255,0.6); }

/* Glass */
.glass { background: var(--glass); border: 1px solid rgba(255,255,255,0.04); padding: 40px 30px; border-radius: 24px; backdrop-filter: blur(12px); transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1); opacity: 0; transform: translateY(40px) rotateX(10deg); }
.glass.visible { opacity: 1; transform: translateY(0) rotateX(0); }
.glass:hover { border-color: rgba(255,255,255,0.15); transform: translateY(-6px); background: rgba(255,255,255,0.04); }

/* Course Section */
.course { padding: 100px 8%; max-width: 1200px; margin: 0 auto; }
.course-header { text-align: center; margin-bottom: 60px; }
.course-label { display: inline-block; font-size: 0.7rem; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; color: rgba(255,255,255,0.3); margin-bottom: 16px; }
.course-title-main { font-size: 2.8rem; font-weight: 800; letter-spacing: -1.5px; color: #fff; margin-bottom: 14px; }
.course-intro { color: rgba(255,255,255,0.38); font-size: 0.95rem; max-width: 500px; margin: 0 auto; line-height: 1.7; }
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.course-card { display: flex; flex-direction: column; gap: 0; padding: 36px 32px; opacity: 0; transform: translateY(40px) rotateX(10deg); transition: all 0.7s cubic-bezier(0.34, 1.56, 0.64, 1); }
.course-card.visible { opacity: 1; transform: translateY(0) rotateX(0); }
.course-card:hover { border-color: rgba(255,255,255,0.12); transform: translateY(-6px); background: rgba(255,255,255,0.04); }
.course-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.course-num { font-size: 0.68rem; color: rgba(255,255,255,0.2); font-weight: 700; letter-spacing: 3px; }
.course-lang { font-size: 0.68rem; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: #888; border: 1px solid rgba(255,255,255,0.1); padding: 4px 12px; border-radius: 20px; }
.course-name { font-size: 1.4rem; font-weight: 800; color: #fff; letter-spacing: -0.5px; margin-bottom: 10px; }
.course-desc { font-size: 0.85rem; color: rgba(255,255,255,0.4); line-height: 1.6; margin-bottom: 24px; }
.course-topics { list-style: none; display: flex; flex-direction: column; gap: 10px; flex: 1; margin-bottom: 28px; }
.course-topics li { font-size: 0.85rem; color: rgba(255,255,255,0.45); padding-left: 16px; position: relative; line-height: 1.5; transition: color 0.3s; }
.course-topics li::before { content: '→'; position: absolute; left: 0; color: #555; font-size: 0.75rem; }
.course-card:hover .course-topics li { color: #aaa; }
.course-card:hover .course-topics li::before { color: #777; }
.course-footer { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.05); }
.course-lessons { font-size: 0.78rem; font-weight: 700; color: #fff; }
.course-level { font-size: 0.72rem; color: #666; font-weight: 600; }

/* Testimonials */
.testimonials { padding: 100px 8%; max-width: 1200px; margin: 0 auto; }
.testimonials-stats { display: flex; justify-content: center; align-items: center; gap: 40px; margin-bottom: 60px; padding: 30px 40px; border: 1px solid rgba(255,255,255,0.06); border-radius: 20px; background: rgba(255,255,255,0.02); backdrop-filter: blur(12px); }
.stat-item { text-align: center; }
.stat-number { display: block; font-size: 2rem; font-weight: 800; color: #fff; letter-spacing: -1px; }
.stat-label { display: block; font-size: 0.75rem; color: rgba(255,255,255,0.38); margin-top: 5px; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500; }
.stat-divider { width: 1px; height: 40px; background: rgba(255,255,255,0.07); }
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.testimonial-card { padding: 32px 28px; display: flex; flex-direction: column; gap: 16px; opacity: 0; transform: translateY(40px) rotateX(10deg); transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1); }
.testimonial-card.visible { opacity: 1; transform: translateY(0) rotateX(0); }
.testimonial-card:hover { border-color: rgba(255,255,255,0.15); transform: translateY(-6px); background: rgba(255,255,255,0.04); }
.stars { color: #fff; font-size: 0.95rem; letter-spacing: 2px; }
.testimonial-text { color: #aaa; font-size: 0.92rem; line-height: 1.65; flex: 1; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; margin-top: 4px; }
.author-avatar { width: 46px; height: 46px; border-radius: 50%; border: 1px solid rgba(255,255,255,0.12); object-fit: cover; flex-shrink: 0; display: block; }
.author-info { display: flex; flex-direction: column; gap: 2px; }
.author-name { font-size: 0.88rem; font-weight: 700; color: #fff; }
.author-role { font-size: 0.78rem; color: rgba(255,255,255,0.35); }

/* Pricing */
.pricing { padding: 100px 8%; display: flex; justify-content: center; }
.premium-glass { position: relative; max-width: 520px; width: 100%; border: 1px solid rgba(255,255,255,0.08); padding: 60px 40px; border-radius: 28px; background: linear-gradient(180deg, rgba(255,255,255,0.04) 0%, transparent 100%); backdrop-filter: blur(20px); opacity: 0; transform: translateY(50px) scale(0.9); transition: all 0.8s cubic-bezier(0.34, 1.56, 0.64, 1); }
.premium-glass.visible { opacity: 1; transform: translateY(0) scale(1); }
.badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: #fff; color: #000; padding: 6px 18px; border-radius: 20px; font-weight: 800; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.5px; }
.price-box { margin: 25px 0 35px 0; border-bottom: 1px solid rgba(255,255,255,0.05); padding-bottom: 25px; display: flex; align-items: baseline; }
.currency { font-size: 1.8rem; color: #666; font-weight: 600; }
.amount { font-size: 4.5rem; font-weight: 800; letter-spacing: -2px; margin: 0 4px; }
.period { color: #555; font-size: 0.95rem; }
.value-list { list-style: none; margin-bottom: 40px; }
.value-list li { margin-bottom: 14px; color: rgba(255,255,255,0.65); font-size: 0.95rem; display: flex; align-items: center; }
.value-list span { color: #fff; font-weight: 800; margin-right: 12px; }
.btn-checkout { display: block; background: #fff; color: #000; text-align: center; padding: 18px; border-radius: 14px; text-decoration: none; font-weight: 700; font-size: 1.05rem; transition: 0.3s; }
.btn-checkout:hover { background: #eee; transform: translateY(-2px); }

/* FAQ */
.faq { padding: 100px 8%; max-width: 700px; margin: 0 auto; }
.section-title { font-size: 2.2rem; font-weight: 800; letter-spacing: -1px; text-align: center; margin-bottom: 40px; }
.faq-item { border-bottom: 1px solid rgba(255,255,255,0.06); opacity: 0; transform: translateY(30px); transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1); }
.faq-item.visible { opacity: 1; transform: translateY(0); }
.faq-question { width: 100%; background: none; border: none; color: #fff; padding: 24px 0; text-align: left; font-size: 1.05rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-answer { color: #666; font-size: 0.95rem; line-height: 1.6; display: none; }
.faq-answer p { padding-bottom: 24px; }
.faq-item.open .faq-answer { display: block; }

/* Footer */
.footer { border-top: 1px solid rgba(255,255,255,0.05); padding: 40px 8%; text-align: center; }
.footer-content p { color: rgba(255,255,255,0.25); font-size: 0.8rem; }

/* Hamburger */
.hamburger { display: none; flex-direction: column; justify-content: center; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; z-index: 1100; }
.hamburger span { display: block; width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: transform 0.3s ease, opacity 0.3s ease; }
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: translateX(-8px); }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Responsive — 1200px */
@media (max-width: 1200px) {
    h1 { font-size: 3.8rem; }
    .feature-name { font-size: 3rem; }
    .brands-row { gap: 36px; }
}

/* Responsive — 1024px */
@media (max-width: 1024px) {
    h1 { font-size: 3.2rem; letter-spacing: -1.5px; }
    .feature-name { font-size: 2.6rem; }
    .features { padding: 80px 6%; }
    .feature-stack { grid-template-columns: repeat(2, 1fr); }
    .course { padding: 80px 6%; }
    .course-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .testimonials { padding: 80px 6%; }
    .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing { padding: 80px 6%; }
    .faq { padding: 80px 6%; }
    .brands-row { gap: 28px; }
    .brand-logo { width: 38px; height: 38px; }
}

/* Responsive — 768px */
@media (max-width: 768px) {
    .nav-links, .nav-cta { display: none; }
    .navbar { padding: 16px 5%; }
    .hamburger { display: flex; }
    h1 { font-size: 2.6rem; letter-spacing: -1px; line-height: 1.15; }
    .hero { padding: 100px 5% 50px; min-height: auto; }
    .sub-headline { font-size: 1rem; margin: 16px auto 32px; max-width: 100%; }
    .hero-btns { margin-bottom: 36px; }
    .btn-main { padding: 15px 36px; font-size: 0.95rem; }
    .trusted { padding: 50px 5% 56px; }
    .brands-row { gap: 20px; }
    .brand-logo { width: 32px; height: 32px; }
    .brand-wrap::after { display: none; }
    .features { padding: 60px 5%; }
    .feature-item { padding: 36px 0; }
    .feature-name { font-size: 2rem; }
    .feature-stack { grid-template-columns: repeat(2, 1fr); }
    .tech-item { padding: 14px 12px 14px 0; }
    .course { padding: 60px 5%; }
    .course-grid { grid-template-columns: 1fr; gap: 14px; }
    .course-card { padding: 28px 24px; }
    .course-title-main { font-size: 2.2rem; }
    .glass { padding: 28px 22px; }
    .testimonials { padding: 60px 5%; }
    .testimonials-stats { flex-direction: column; gap: 20px; padding: 24px 20px; }
    .stat-divider { width: 50px; height: 1px; }
    .stat-number { font-size: 1.6rem; }
    .testimonials-grid { grid-template-columns: 1fr; gap: 14px; }
    .section-title { font-size: 1.9rem; }
    .pricing { padding: 60px 5%; }
    .premium-glass { padding: 44px 24px; max-width: 100%; }
    .amount { font-size: 3.5rem; }
    .faq { padding: 60px 5%; max-width: 100%; }
    .faq-question { font-size: 0.95rem; padding: 18px 0; }
    .footer { padding: 32px 5%; }
}

/* Responsive — 480px */
@media (max-width: 480px) {
    .navbar { padding: 14px 4%; }
    .logo { font-size: 1.05rem; }
    h1 { font-size: 2rem; letter-spacing: -0.5px; line-height: 1.2; }
    .hero { padding: 88px 4% 40px; }
    .sub-headline { font-size: 0.92rem; margin: 14px auto 28px; }
    .btn-main { padding: 13px 30px; font-size: 0.9rem; }
    .trusted { padding: 44px 4% 50px; }
    .brands-row { gap: 16px; }
    .brand-logo { width: 28px; height: 28px; }
    .features { padding: 48px 4%; }
    .feature-item { padding: 28px 0; }
    .feature-name { font-size: 1.65rem; letter-spacing: -0.5px; }
    .feature-stack { grid-template-columns: 1fr; }
    .tech-item { border-right: none; padding: 12px 0; }
    .feature-count { font-size: 0.7rem; padding: 4px 10px; }
    .course { padding: 48px 4%; }
    .course-title-main { font-size: 1.9rem; }
    .course-card { padding: 24px 18px; }
    .course-name { font-size: 1.2rem; }
    .testimonials { padding: 48px 4%; }
    .section-title { font-size: 1.65rem; margin-bottom: 28px; }
    .testimonials-stats { padding: 20px 16px; gap: 16px; }
    .stat-number { font-size: 1.4rem; }
    .pricing { padding: 48px 4%; }
    .premium-glass { padding: 36px 18px; border-radius: 20px; }
    .amount { font-size: 3rem; }
    .currency { font-size: 1.5rem; }
    .value-list li { font-size: 0.88rem; margin-bottom: 10px; }
    .btn-checkout { padding: 15px; font-size: 0.95rem; border-radius: 12px; }
    .faq { padding: 48px 4%; }
    .faq-question { font-size: 0.9rem; padding: 16px 0; }
    .footer { padding: 28px 4%; }
    .footer-content p { font-size: 0.75rem; }
}

/* Responsive — 360px */
@media (max-width: 360px) {
    h1 { font-size: 1.75rem; }
    .feature-name { font-size: 1.5rem; }
}