* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    color: #172033;
    background: #ffffff;
    line-height: 1.6;
}

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}


/* HEADER */

.header {
    border-bottom: 1px solid #e8ebf0;
    background: #ffffff;
}

.header-content {
    min-height: 70px;

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

.logo {
    color: #172033;
    font-size: 1.2rem;
    font-weight: 700;
    text-decoration: none;
}

nav {
    display: flex;
    gap: 25px;
}

nav a {
    color: #4b5565;
    text-decoration: none;
}

nav a:hover {
    color: #172033;
}


/* HERO */

.hero {
    padding: 110px 0;

    background:
        linear-gradient(
            135deg,
            #f5f7fb,
            #ffffff
        );
}

.eyebrow {
    display: inline-block;

    margin-bottom: 15px;

    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;

    color: #5266d8;
}

.hero h1 {
    max-width: 750px;

    margin: 0 0 25px;

    font-size: clamp(2.4rem, 6vw, 4.5rem);
    line-height: 1.05;
}

.hero-text {
    max-width: 650px;

    margin-bottom: 35px;

    font-size: 1.2rem;
    color: #596273;
}


/* BUTTON */

.button {
    display: inline-block;

    border: 0;
    border-radius: 8px;

    padding: 13px 22px;

    background: #5266d8;
    color: white;

    font: inherit;
    font-weight: 600;

    text-decoration: none;
    cursor: pointer;
}

.button:hover {
    opacity: 0.9;
}

.button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}


/* SECTIONS */

.section {
    padding: 90px 0;
}

.section-heading {
    max-width: 700px;
    margin-bottom: 45px;
}

.section-heading h2 {
    margin: 0 0 15px;

    font-size: 2.4rem;
}

.section-heading p {
    margin: 0;

    color: #667085;
}


/* COURSES */

.courses {
    display: grid;

    grid-template-columns:
        repeat(auto-fit, minmax(260px, 1fr));

    gap: 25px;
}

.course {
    padding: 30px;

    border: 1px solid #e4e7ec;
    border-radius: 12px;

    background: white;
}

.course h3 {
    margin-top: 0;
}

.course p {
    color: #667085;
}

.loading {
    color: #667085;
}


/* CONTACT */

.section-contact {
    background: #f7f8fb;
}

.contact-form {
    max-width: 700px;

    padding: 35px;

    border: 1px solid #e2e5eb;
    border-radius: 12px;

    background: white;
}

.form-group {
    margin-bottom: 22px;
}

.form-row {
    display: grid;

    grid-template-columns:
        repeat(2, 1fr);

    gap: 20px;
}

label {
    display: block;

    margin-bottom: 7px;

    font-weight: 600;
}

input,
select,
textarea {
    width: 100%;

    padding: 12px 13px;

    border: 1px solid #d0d5dd;
    border-radius: 7px;

    background: white;

    font: inherit;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    outline: 2px solid #c7cffc;
    border-color: #5266d8;
}

.form-help {
    margin-top: -10px;
    margin-bottom: 25px;

    color: #667085;
    font-size: 0.9rem;
}

.privacy {
    margin-bottom: 25px;

    font-size: 0.9rem;
}

.privacy label {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.privacy input {
    width: auto;
    margin-top: 5px;
}

.privacy a {
    color: #5266d8;
}

.form-message {
    margin-top: 20px;

    padding: 12px;

    border-radius: 7px;

    display: none;
}

.form-message.success {
    display: block;

    background: #ecfdf3;
    color: #067647;
}

.form-message.error {
    display: block;

    background: #fef3f2;
    color: #b42318;
}


/* FOOTER */

.footer {
    padding: 30px 0;

    border-top: 1px solid #e8ebf0;

    color: #667085;
    font-size: 0.9rem;
}

.footer .container {
    display: flex;
    justify-content: space-between;
}

.footer a {
    color: inherit;
}


/* MOBILE */

@media (max-width: 700px) {

    .header-content {
        flex-direction: column;
        justify-content: center;

        padding: 15px 0;
        gap: 12px;
    }

    nav {
        gap: 15px;
    }

    .hero {
        padding: 75px 0;
    }

    .section {
        padding: 65px 0;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .contact-form {
        padding: 25px;
    }

    .footer .container {
        flex-direction: column;
        gap: 10px;
    }
}