:root {
    --color-primary: #1a1a1a;
    --color-secondary: #2c5f7d;
    --color-accent: #4a8fb3;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f5f5;
    --color-border: #dddddd;
    --color-error: #c41e3a;
    --color-success: #2d7a4a;
    --spacing-unit: 8px;
    --max-width: 1200px;
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --transition: 0.3s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-base);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover,
a:focus {
    color: var(--color-accent);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 2);
}

.header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    border-bottom: 3px solid var(--color-primary);
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.header__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.5);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--color-primary);
    transition: transform var(--transition);
}

.logo:hover {
    transform: scale(1.02);
    color: var(--color-primary);
}

.logo__icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 900;
    border: 3px solid var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: calc(var(--spacing-unit));
}

.nav-toggle span {
    width: 28px;
    height: 3px;
    background-color: var(--color-primary);
    transition: all var(--transition);
}

.nav__list {
    display: flex;
    gap: calc(var(--spacing-unit) * 4);
    list-style: none;
}

.nav__link {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
    padding: calc(var(--spacing-unit)) 0;
    border-bottom: 3px solid transparent;
    transition: border-color var(--transition);
}

.nav__link:hover,
.nav__link:focus {
    color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
}

.main {
    min-height: 60vh;
}

.hero {
    padding: calc(var(--spacing-unit) * 12) 0 calc(var(--spacing-unit) * 10);
    background-color: var(--color-bg-alt);
    border-bottom: 3px solid var(--color-primary);
}

.hero__content {
    max-width: 800px;
}

.hero__title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: calc(var(--spacing-unit) * 3);
    color: var(--color-primary);
    animation: fadeInUp 0.8s ease-out;
}

.hero__subtitle {
    font-size: 1.25rem;
    line-height: 1.5;
    color: var(--color-text-light);
    margin-bottom: calc(var(--spacing-unit) * 5);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.btn {
    display: inline-block;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
    font-size: 1rem;
    font-weight: 700;
    text-align: center;
    border: 3px solid var(--color-primary);
    cursor: pointer;
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

.btn--primary:hover,
.btn--primary:focus {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn--secondary {
    background-color: var(--color-bg);
    color: var(--color-primary);
}

.btn--secondary:hover,
.btn--secondary:focus {
    background-color: var(--color-primary);
    color: var(--color-bg);
    transform: translateY(-2px);
}

.btn--full {
    width: 100%;
}

.features {
    padding: calc(var(--spacing-unit) * 10) 0;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.feature {
    padding: calc(var(--spacing-unit) * 4);
    border: 3px solid var(--color-border);
    background-color: var(--color-bg);
    transition: all var(--transition);
}

.feature:hover {
    border-color: var(--color-secondary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.feature__number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-border);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.feature__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-primary);
}

.feature__text {
    line-height: 1.5;
    color: var(--color-text-light);
}

.about-preview {
    padding: calc(var(--spacing-unit) * 10) 0;
    background-color: var(--color-bg-alt);
}

.about-preview__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 6);
    align-items: center;
}

.about-preview__image {
    border: 3px solid var(--color-primary);
    overflow: hidden;
}

.about-preview__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.about-preview__image:hover img {
    transform: scale(1.05);
}

.section__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: calc(var(--spacing-unit) * 3);
    color: var(--color-primary);
}

.about-preview__text {
    line-height: 1.5;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.cta {
    padding: calc(var(--spacing-unit) * 10) 0;
    background-color: var(--color-primary);
    color: var(--color-bg);
    border-top: 3px solid var(--color-primary);
}

.cta--compact {
    padding: calc(var(--spacing-unit) * 6) 0;
}

.cta__content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 900;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.cta__text {
    font-size: 1.125rem;
    line-height: 1.5;
    margin-bottom: calc(var(--spacing-unit) * 4);
    opacity: 0.9;
}

.cta .btn--primary {
    border-color: var(--color-bg);
    background-color: var(--color-bg);
    color: var(--color-primary);
}

.cta .btn--primary:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-bg);
}

.page-hero {
    padding: calc(var(--spacing-unit) * 8) 0 calc(var(--spacing-unit) * 6);
    background-color: var(--color-bg-alt);
    border-bottom: 3px solid var(--color-primary);
}

.page-hero--compact {
    padding: calc(var(--spacing-unit) * 6) 0 calc(var(--spacing-unit) * 4);
}

.page-hero__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-primary);
}

.page-hero__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
}

.content-section {
    padding: calc(var(--spacing-unit) * 8) 0;
}

.content-grid {
    display: grid;
    gap: calc(var(--spacing-unit) * 6);
}

.content-block__title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 3);
    color: var(--color-primary);
    border-left: 4px solid var(--color-primary);
    padding-left: calc(var(--spacing-unit) * 2);
}

.content-block__text {
    line-height: 1.5;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.values {
    padding: calc(var(--spacing-unit) * 8) 0;
    background-color: var(--color-bg-alt);
}

.values .section__title {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.values__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.value-card {
    padding: calc(var(--spacing-unit) * 4);
    border: 3px solid var(--color-border);
    background-color: var(--color-bg);
    transition: all var(--transition);
}

.value-card:hover {
    border-color: var(--color-secondary);
}

.value-card__number {
    font-size: 2rem;
    font-weight: 900;
    color: var(--color-border);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.value-card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-primary);
}

.value-card__text {
    line-height: 1.5;
    color: var(--color-text-light);
}

.courses {
    padding: calc(var(--spacing-unit) * 8) 0;
}

.courses__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.course-card {
    border: 3px solid var(--color-border);
    background-color: var(--color-bg);
    display: flex;
    flex-direction: column;
    transition: all var(--transition);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.course-card--featured {
    border-color: var(--color-secondary);
    border-width: 4px;
}

.course-card__header {
    padding: calc(var(--spacing-unit) * 3);
    background-color: var(--color-bg-alt);
    border-bottom: 3px solid var(--color-border);
}

.course-card--featured .course-card__header {
    background-color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
}

.course-card__tag {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text);
}

.course-card--featured .course-card__tag {
    color: var(--color-bg);
}

.course-card__content {
    padding: calc(var(--spacing-unit) * 4);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-card__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 3);
    color: var(--color-primary);
}

.course-card__description {
    line-height: 1.5;
    margin-bottom: calc(var(--spacing-unit) * 4);
    color: var(--color-text-light);
}

.course-card__features {
    list-style: none;
    margin-bottom: calc(var(--spacing-unit) * 4);
    flex-grow: 1;
}

.course-card__features li {
    padding: calc(var(--spacing-unit)) 0;
    padding-left: calc(var(--spacing-unit) * 3);
    border-left: 3px solid var(--color-border);
    margin-bottom: calc(var(--spacing-unit));
}

.approach {
    padding: calc(var(--spacing-unit) * 8) 0;
    background-color: var(--color-bg-alt);
}

.approach .section__title {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.approach__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.approach__item {
    padding: calc(var(--spacing-unit) * 4);
    background-color: var(--color-bg);
    border: 3px solid var(--color-border);
}

.approach__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-primary);
}

.approach__text {
    line-height: 1.5;
    color: var(--color-text-light);
}

.contacts-section {
    padding: calc(var(--spacing-unit) * 8) 0;
}

.contacts__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: calc(var(--spacing-unit) * 6);
}

.contacts__title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 4);
    color: var(--color-primary);
    border-left: 4px solid var(--color-primary);
    padding-left: calc(var(--spacing-unit) * 2);
}

.contact-item {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.contact-item__title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit));
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item__text {
    line-height: 1.5;
    color: var(--color-text-light);
}

.contact-form {
    border: 3px solid var(--color-border);
    padding: calc(var(--spacing-unit) * 4);
    background-color: var(--color-bg-alt);
}

.form-group {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit));
    color: var(--color-text);
}

.required {
    color: var(--color-error);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: calc(var(--spacing-unit) * 1.5);
    font-size: 1rem;
    font-family: var(--font-base);
    border: 3px solid var(--color-border);
    background-color: var(--color-bg);
    transition: border-color var(--transition);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.form-input--error {
    border-color: var(--color-error);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-error {
    display: block;
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: calc(var(--spacing-unit));
    font-weight: 600;
}

.form-error--general {
    padding: calc(var(--spacing-unit) * 2);
    background-color: #fef2f2;
    border: 2px solid var(--color-error);
    border-radius: 0;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.form-group--checkbox {
    margin-top: calc(var(--spacing-unit) * 4);
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: calc(var(--spacing-unit) * 1.5);
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    margin-top: 4px;
    width: 20px;
    height: 20px;
    cursor: pointer;
    flex-shrink: 0;
}

.form-checkbox__text {
    font-size: 0.9375rem;
    line-height: 1.5;
}

.thank-you {
    padding: calc(var(--spacing-unit) * 12) 0;
}

.thank-you__content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.thank-you__icon {
    width: 80px;
    height: 80px;
    margin: 0 auto calc(var(--spacing-unit) * 4);
    background-color: var(--color-success);
    color: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    border: 4px solid var(--color-success);
    animation: scaleIn 0.5s ease-out;
}

@keyframes scaleIn {
    from {
        transform: scale(0);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.thank-you__title {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: calc(var(--spacing-unit) * 3);
    color: var(--color-primary);
}

.thank-you__text {
    line-height: 1.5;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-text-light);
}

.thank-you__actions {
    margin-top: calc(var(--spacing-unit) * 5);
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 2);
    justify-content: center;
}

.faq-section {
    padding: calc(var(--spacing-unit) * 8) 0;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    border: 3px solid var(--color-border);
    margin-bottom: calc(var(--spacing-unit) * 2);
    background-color: var(--color-bg);
}

.faq-question {
    width: 100%;
    padding: calc(var(--spacing-unit) * 3);
    background-color: var(--color-bg);
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
    transition: background-color var(--transition);
    font-family: var(--font-base);
}

.faq-question:hover {
    background-color: var(--color-bg-alt);
}

.faq-question[aria-expanded="true"] {
    background-color: var(--color-bg-alt);
}

.faq-question__text {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    flex-grow: 1;
}

.faq-question__icon {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-secondary);
    flex-shrink: 0;
    transition: transform var(--transition);
}

.faq-question[aria-expanded="true"] .faq-question__icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 3);
    border-top: 2px solid var(--color-border);
}

.faq-answer p {
    line-height: 1.5;
    color: var(--color-text-light);
}

.legal-content {
    padding: calc(var(--spacing-unit) * 6) 0 calc(var(--spacing-unit) * 8);
}

.legal-text {
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.6;
}

.legal-text h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: calc(var(--spacing-unit) * 5);
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-primary);
    border-left: 4px solid var(--color-primary);
    padding-left: calc(var(--spacing-unit) * 2);
}

.legal-text p {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.legal-text ul {
    margin: calc(var(--spacing-unit) * 2) 0;
    padding-left: calc(var(--spacing-unit) * 5);
}

.legal-text li {
    margin-bottom: calc(var(--spacing-unit));
    line-height: 1.6;
}

.footer {
    background-color: var(--color-primary);
    color: var(--color-bg);
    padding: calc(var(--spacing-unit) * 8) 0 calc(var(--spacing-unit) * 4);
    border-top: 3px solid var(--color-primary);
}

.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: calc(var(--spacing-unit) * 6);
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.footer__title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer__text {
    line-height: 1.5;
    opacity: 0.9;
    margin-bottom: calc(var(--spacing-unit));
}

.footer__text a {
    color: var(--color-bg);
    text-decoration: underline;
}

.footer__text a:hover {
    opacity: 0.8;
}

.footer__links {
    list-style: none;
}

.footer__links li {
    margin-bottom: calc(var(--spacing-unit));
}

.footer__link {
    color: var(--color-bg);
    opacity: 0.9;
    transition: opacity var(--transition);
}

.footer__link:hover {
    opacity: 1;
    color: var(--color-bg);
}

.footer__bottom {
    border-top: 2px solid rgba(255, 255, 255, 0.2);
    padding-top: calc(var(--spacing-unit) * 4);
    text-align: center;
}

.footer__disclaimer {
    font-size: 0.875rem;
    line-height: 1.5;
    opacity: 0.8;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.footer__copyright {
    font-size: 0.875rem;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-bg);
        border-bottom: 3px solid var(--color-primary);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav__list {
        flex-direction: column;
        gap: 0;
        padding: calc(var(--spacing-unit) * 2) 0;
    }

    .nav__link {
        display: block;
        padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2);
        border-bottom: 2px solid var(--color-border);
        border-left: 3px solid transparent;
    }

    .nav__link:hover {
        border-left-color: var(--color-secondary);
    }

    .thank-you__actions {
        flex-direction: column;
    }

    .thank-you__actions .btn {
        width: 100%;
    }
}

@media (max-width: 640px) {
    :root {
        --spacing-unit: 6px;
    }

    .hero {
        padding: calc(var(--spacing-unit) * 8) 0 calc(var(--spacing-unit) * 6);
    }

    .features,
    .about-preview,
    .content-section,
    .values,
    .courses,
    .approach,
    .contacts-section,
    .faq-section {
        padding: calc(var(--spacing-unit) * 6) 0;
    }

    .features__grid,
    .values__grid,
    .courses__grid,
    .approach__grid {
        grid-template-columns: 1fr;
    }
}

[hidden] {
    display: none !important;
}