```css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #e94560;
    --secondary: #0f3460;
    --bg: #1a1a2e;
    --text: #eee;
    --card: rgba(255, 255, 255, 0.08);
    --glass: rgba(255, 255, 255, 0.12);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 20px;
    --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

body.light {
    --bg: #f5f5f5;
    --text: #222;
    --card: rgba(0, 0, 0, 0.04);
    --glass: rgba(0, 0, 0, 0.06);
}

a {
    color: var(--primary);
    text-decoration: none;
}

img,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 26, 46, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: var(--transition);
}

body.light header {
    background: rgba(245, 245, 245, 0.85);
    border-color: rgba(0, 0, 0, 0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--primary), #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

nav {
    display: flex;
    gap: 8px;
}

nav a {
    padding: 8px 14px;
    border-radius: 40px;
    font-size: 0.9rem;
    color: var(--text);
    opacity: 0.8;
    transition: var(--transition);
}

nav a:hover,
nav a.active {
    opacity: 1;
    background: var(--glass);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 4px;
    transition: var(--transition);
}

.dark-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 40px;
    transition: var(--transition);
}

.dark-toggle:hover {
    background: var(--glass);
}

/* hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    background: radial-gradient(ellipse at 30% 20%, rgba(233, 69, 96, 0.15), transparent 60%), radial-gradient(ellipse at 70% 80%, rgba(15, 52, 96, 0.2), transparent 50%);
}

.hero h1 {
    font-size: clamp(2.2rem, 7vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--primary), #ff9a9e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    max-width: 640px;
    margin: 0 auto 36px;
    opacity: 0.8;
}

.btn-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 36px;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(233, 69, 96, 0.5);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--text);
    color: var(--text);
}

.btn-outline:hover {
    background: var(--text);
    color: var(--bg);
}

/* sections */
section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 48px;
}

.section-title span {
    background: linear-gradient(135deg, var(--primary), #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.grid-2,
.grid-3,
.grid-4 {
    display: grid;
    gap: 28px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.card {
    background: var(--card);
    backdrop-filter: blur(12px);
    border-radius: var(--radius);
    padding: 32px 24px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.card:hover {
    transform: translateY(-8px);
}

body.light .card {
    border-color: rgba(0, 0, 0, 0.06);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), #ff6b6b);
    margin-bottom: 16px;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.card p {
    opacity: 0.8;
    font-size: 0.95rem;
}

.number {
    font-size: 2.8rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), #ff9a9e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* carousel */
.carousel {
    overflow: hidden;
    position: relative;
    border-radius: var(--radius);
}

.carousel-track {
    display: flex;
    transition: transform 0.6s ease;
}

.carousel-slide {
    min-width: 100%;
    padding: 40px 32px;
    background: var(--card);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--glass);
    border: none;
    color: var(--text);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.4rem;
    transition: var(--transition);
    z-index: 2;
}

.carousel-btn:hover {
    background: var(--primary);
}

.carousel-btn.prev {
    left: 12px;
}

.carousel-btn.next {
    right: 12px;
}

/* faq */
.faq-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 16px 0;
    cursor: pointer;
}

body.light .faq-item {
    border-color: rgba(0, 0, 0, 0.08);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 1.05rem;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.3s;
    padding-top: 0;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding-top: 16px;
}

.faq-toggle {
    font-size: 1.4rem;
    transition: transform 0.3s;
}

.faq-item.open .faq-toggle {
    transform: rotate(45deg);
}

/* footer */
footer {
    background: rgba(0, 0, 0, 0.3);
    padding: 60px 0 30px;
    margin-top: 40px;
}

body.light footer {
    background: rgba(0, 0, 0, 0.04);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 32px;
    margin-bottom: 40px;
}

.footer-grid h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    opacity: 0.9;
}

.footer-grid a,
.footer-grid p {
    display: block;
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.6;
}

body.light .footer-bottom {
    border-color: rgba(0, 0, 0, 0.06);
}

/* back to top */
.back-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    z-index: 999;
}

.back-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-top:hover {
    transform: translateY(-4px);
}

/* breadcrumb */
.breadcrumb {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: 24px;
}

.breadcrumb a {
    color: var(--text);
    opacity: 0.7;
}

.breadcrumb a:hover {
    opacity: 1;
}

/* search */
.search-box {
    display: flex;
    gap: 8px;
    max-width: 400px;
    margin: 0 auto 32px;
}

.search-box input {
    flex: 1;
    padding: 12px 20px;
    border-radius: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: var(--card);
    color: var(--text);
    font-size: 1rem;
    outline: none;
}

.search-box input::placeholder {
    opacity: 0.5;
}

.search-box button {
    padding: 12px 24px;
    border-radius: 40px;
    border: none;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
}

/* responsive */
@media (max-width: 768px) {
    nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        padding: 16px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    nav.open {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    section {
        padding: 48px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }
}

/* scroll animation */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}
```