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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: #050816;
    color: white;
}

/* HERO */

.hero {
    min-height: 100vh;
    padding: 2rem 8%;
    background:
        radial-gradient(circle at top, rgba(59,130,246,0.18), transparent 35%),
        radial-gradient(circle at right, rgba(37,99,235,0.08), transparent 30%),
        #050816;
}

/* NAVBAR */

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: white;
    letter-spacing: 0.5px;
}

.nav-button {
    text-decoration: none;
    color: white;
    padding: 0.8rem 1.4rem;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    transition: 0.3s;
    backdrop-filter: blur(10px);
}

.nav-button:hover {
    background: rgba(255,255,255,0.08);
}

/* HERO WRAPPER */

.hero-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
}

/* HERO CONTENT */

.hero-content {
    max-width: 700px;
    margin-top: 10rem;
    flex: 1;
}

.hero-tag {
    color: #60a5fa;
    margin-bottom: 1rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.hero-content h1 {
    font-size: 4.5rem;
    line-height: 1.05;
    margin-bottom: 2rem;
}

.hero-description {
    font-size: 1.2rem;
    line-height: 1.8;
    color: #cbd5e1;
    margin-bottom: 3rem;
}

/* HERO IMAGE */

.hero-image {
    flex: 1;

    display: flex;
    justify-content: center;
    align-items: center;

    padding-top: 4rem;
}

.math-illustration {
    width: 100%;
    max-width: 520px;

    stroke: rgba(255,255,255,0.12);

    animation: float 6s ease-in-out infinite;

    transform: translateY(40px);
}

/* FLOAT */

@keyframes float {

    0% {
        transform: translateY(40px);
    }

    50% {
        transform: translateY(25px);
    }

    100% {
        transform: translateY(40px);
    }

}

/* BUTTONS */

.hero-buttons {
    display: flex;
    gap: 1rem;

    flex-wrap: wrap;

    align-items: center;
}

.primary-button {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: white;
    text-decoration: none;

    padding: 1rem 1.8rem;

    border-radius: 14px;

    font-weight: 600;

    transition: 0.3s;

    display: inline-flex;

    align-items: center;

    justify-content: center;

    min-width: 220px;

    text-align: center;
}

.primary-button:hover {
    transform: translateY(-3px);

    box-shadow: 0 0 25px rgba(59,130,246,0.35);
}

.secondary-button {
    border: 1px solid rgba(255,255,255,0.1);

    color: white;

    text-decoration: none;

    padding: 1rem 1.8rem;

    border-radius: 14px;

    transition: 0.3s;

    backdrop-filter: blur(10px);

    display: inline-flex;

    align-items: center;

    justify-content: center;

    min-width: 220px;

    text-align: center;
}

.secondary-button:hover {
    background: rgba(255,255,255,0.06);
}

/* HERO INFO */

.hero-info {
    display: flex;

    gap: 1.2rem;

    margin-top: 1.8rem;

    flex-wrap: wrap;
}

.hero-info span {
    color: #94a3b8;

    font-size: 0.92rem;
}

/* OFFER */

.offer {
    padding: 8rem 8%;
}

.section-header {
    margin-bottom: 4rem;
}

.section-tag {
    color: #60a5fa;
    font-weight: 500;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
}

.section-header h2 {
    font-size: 3rem;
}

.offer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.offer-card {
    background: rgba(15,23,42,0.65);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 24px;
    padding: 2rem;
    transition: 0.3s;
    backdrop-filter: blur(12px);
}

.offer-card:hover {
    transform: translateY(-5px);

    border-color: rgba(96,165,250,0.4);

    box-shadow: 0 0 30px rgba(59,130,246,0.08);
}

.offer-card h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.offer-card p {
    color: #cbd5e1;
    line-height: 1.7;
}

.offer-price {
    margin-top: 1.5rem;

    color: #60a5fa;

    font-weight: 600;

    font-size: 1.05rem;
}

.offer-price-secondary {
    margin-top: 0.5rem;

    color: #94a3b8;

    font-size: 0.95rem;
}

/* ABOUT */

.about {
    padding: 8rem 8%;
}

.about-box {
    max-width: 900px;

    margin: 0 auto;

    background: rgba(15,23,42,0.65);

    border: 1px solid rgba(255,255,255,0.06);

    border-radius: 28px;

    padding: 3rem;

    backdrop-filter: blur(12px);

    display: flex;

    align-items: center;

    justify-content: space-between;

    gap: 3rem;
}

.about-text {
    flex: 1;
}

.about-box p {
    color: #cbd5e1;

    line-height: 1.9;

    font-size: 1.08rem;

    margin-bottom: 1.5rem;
}

.about-box p:last-child {
    margin-bottom: 0;
}

.about-image {
    width: 180px;

    height: 180px;

    object-fit: cover;

    border-radius: 24px;

    opacity: 0.92;
}

/* PROCESS */

.process {
    padding: 8rem 8%;
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.process-card {
    padding: 2rem;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.process-card span {
    color: #60a5fa;
    font-size: 0.9rem;
    font-weight: 600;
}

.process-card h3 {
    margin-top: 1rem;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.process-card p {
    color: #cbd5e1;
    line-height: 1.8;
}

/* REVIEWS */

.reviews {
    padding: 8rem 8%;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.review-card {
    background: rgba(15,23,42,0.65);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 24px;
    padding: 2rem;
    backdrop-filter: blur(12px);
}

.review-text {
    color: white;
    line-height: 1.8;
    margin-bottom: 2rem;
    font-size: 1.05rem;
}

.review-author {
    color: #60a5fa;
    font-size: 0.95rem;
}

/* CONTACT */

.contact {
    padding: 8rem 8%;
}

.contact-content {
    text-align: center;

    background: rgba(15,23,42,0.7);

    border: 1px solid rgba(255,255,255,0.06);

    border-radius: 32px;

    padding: 5rem 2rem;

    backdrop-filter: blur(12px);
}

.contact-content h2 {
    font-size: 3rem;

    margin-top: 1rem;

    margin-bottom: 1.5rem;
}

.contact-description {
    color: #cbd5e1;

    max-width: 600px;

    margin: 0 auto 3rem;

    line-height: 1.8;

    font-size: 1.1rem;
}

.contact-buttons {
    display: flex;

    justify-content: center;

    gap: 1rem;
}

.contact-note {
    margin-top: 2rem;

    color: #94a3b8;

    font-size: 0.95rem;

    line-height: 1.6;
}

/* FOOTER */

.footer {
    padding: 3rem 8%;

    text-align: center;

    color: #64748b;

    font-size: 0.95rem;
}

/* MOBILE */

@media (max-width: 768px) {

    .hero {
        padding: 2rem 6%;
    }

    .hero-wrapper {
        flex-direction: column;

        gap: 2rem;
    }

    .hero-content {
        margin-top: 4rem;

        text-align: left;
    }

    .hero-content h1 {
        font-size: 3rem;

        line-height: 1.05;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;

        align-items: stretch;
    }

    .primary-button,
    .secondary-button {
        width: 100%;
    }

    .hero-info {
        gap: 1rem;
    }

    .hero-image {
        padding-top: 0;

        justify-content: center;
    }

    .math-illustration {
        max-width: 100%;

        transform: none;
    }

    .offer-grid,
    .process-grid,
    .reviews-grid {
        grid-template-columns: 1fr;
    }

    .section-header h2 {
        font-size: 2.2rem;
    }

    .about-box {
        flex-direction: column;

        text-align: left;
    }

    .about-image {
        width: 150px;

        height: 150px;
    }

}