*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #1a202c;
    background-color: #ffffff;
}

/* ===== DESIGN TOKENS ===== */
:root {
    --color-primary: #1a365d;
    --color-accent: #059669;
    --color-text: #1a202c;
    --color-text-light: #4a5568;
    --color-border: #e2e8f0;
    --color-bg-alt: #f7fafc;
    --color-success: #38a169;

    --container-max-width: 1200px;
    --container-narrow-width: 780px;
    --header-height: 80px;
    --border-radius: 6px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s ease;
}

/* ===== UTILITIES ===== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.container--narrow {
    max-width: var(--container-narrow-width);
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn--primary:hover,
.btn--primary:focus {
    background-color: #047857;
}

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

.btn--secondary:hover,
.btn--secondary:focus {
    background-color: var(--color-primary);
    color: white;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    margin: 0 0 16px 0;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: 40px; }
h2 { font-size: 32px; }
h3 { font-size: 24px; }
h4 { font-size: 20px; }
h5 { font-size: 18px; }
h6 { font-size: 16px; }

p {
    margin: 0 0 16px 0;
}

.page-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 48px;
    color: var(--color-primary);
}

.section-title {
    font-size: 32px;
    margin-bottom: 32px;
    color: var(--color-primary);
}

.content-text {
    font-size: 18px;
    line-height: 1.7;
}

.content-text p {
    margin-bottom: 24px;
}

.content-text h2 {
    font-size: 24px;
    margin-top: 48px;
    margin-bottom: 24px;
    color: var(--color-primary);
}

.content-text ul,
.content-text ol {
    margin-bottom: 24px;
    padding-left: 24px;
}

.content-text li {
    margin-bottom: 8px;
}

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.header--sticky {
    box-shadow: var(--shadow-sm);
}

.header__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    position: relative;
    gap: 16px;
}

.logo {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
}

.logo__text {
    color: var(--color-primary);
}

/* ===== NAVIGATION ===== */
.nav {
    display: flex;
    align-items: center;
}

.nav__list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 32px;
}


.nav__item {
    position: relative;
}

.nav__link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 0;
    transition: var(--transition);
    position: relative;
}

.nav__link:hover,
.nav__link:focus,
.nav__link--active {
    color: var(--color-accent);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

.nav__link:hover::after,
.nav__link:focus::after,
.nav__link--active::after {
    width: 100%;
}

/* ===== BURGER MENU TOGGLE ===== */
.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    position: relative;
}

.nav__toggle:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.nav__toggle-icon {
    width: 30px;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: 3px;
    transition: var(--transition);
    position: relative;
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
    content: '';
    position: absolute;
    width: 30px;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: 3px;
    transition: var(--transition);
    left: 0;
}

.nav__toggle-icon::before {
    top: -10px;
}

.nav__toggle-icon::after {
    bottom: -10px;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon {
    background-color: transparent;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* ===== MAIN SECTIONS ===== */
main {
    margin-top: var(--header-height);
}

section {
    padding: 80px 0;
}

section:nth-child(even) {
    background-color: var(--color-bg-alt);
}

/* ===== HERO ===== */
.hero {
    padding: 120px 0 80px 0;
    background-color: var(--color-bg-alt);
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero__text {
    order: 1;
}

.hero__image {
    order: 2;
}

.hero__image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    display: block;
    box-shadow: var(--shadow-md);
}

.hero__title {
    font-size: 40px;
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero__description {
    font-size: 18px;
    margin-bottom: 24px;
    color: var(--color-text-light);
}

.hero__cta {
    margin-top: 32px;
}

/* ===== VIDEO SECTION ===== */
.video-section {
    padding: 40px 0;
}

.video__wrapper {
    display: flex;
    justify-content: center;
}

.video__container {
    width: 100%;
    max-width: 800px;
}

.video__container video {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius);
}

/* ===== ABOUT ===== */
.about {
    padding: 80px 0;
}

.about__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about__image {
    order: 1;
}

.about__image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    display: block;
    box-shadow: var(--shadow-md);
}

.about__text {
    order: 2;
}

/* ===== PRICING ===== */
.pricing {
    padding: 80px 0;
}

.pricing__content {
    display: grid;
    gap: 48px;
}

.pricing__intro {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--color-text-light);
}

.pricing__section {
    margin-bottom: 48px;
}

.pricing__section-title {
    font-size: 24px;
    margin-bottom: 32px;
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 8px;
}

.pricing__group {
    margin-bottom: 32px;
    padding: 24px;
    background-color: #ffffff;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.pricing__group h4 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--color-primary);
}

.pricing__item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}

.pricing__item:last-child {
    border-bottom: none;
}

.pricing__item--simple {
    flex-direction: row;
    align-items: center;
    padding: 12px 0;
}

.pricing__details {
    flex: 1;
    margin-right: 24px;
}

.pricing__duration,
.pricing__note {
    display: block;
    font-size: 16px;
    color: var(--color-text-light);
    margin-bottom: 4px;
}

.pricing__label {
    font-weight: 500;
    color: var(--color-text);
}

.pricing__price {
    text-align: right;
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
}

.pricing__amount {
    font-size: 24px;
}

.pricing__period {
    font-size: 16px;
    font-weight: 400;
    color: var(--color-text-light);
}

/* ===== CONTACT FORM ===== */
.contact-form-section {
    padding: 80px 0;
}

.contact-form__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-form__image {
    order: 1;
}

.contact-form__image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    display: block;
    box-shadow: var(--shadow-md);
}

.contact-form__text {
    order: 2;
}

.contact-form {
    margin-top: 32px;
    padding: 32px;
    background-color: #ffffff;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--color-text);
    font-size: 16px;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
    background-color: #ffffff;
}

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

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

.form-error {
    display: block;
    margin-top: 4px;
    font-size: 14px;
    color: #e53e3e;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.form-error[aria-hidden="false"] {
    opacity: 1;
}

.form-success {
    background-color: #f0fff4;
    color: #22543d;
    padding: 16px;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--color-success);
    margin-top: 24px;
}

/* ===== REVIEWS ===== */
.reviews {
    padding: 80px 0;
}

.reviews__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.reviews__image {
    order: 1;
}

.reviews__image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    display: block;
    box-shadow: var(--shadow-md);
}

.reviews__text {
    order: 2;
}

.reviews__list {
    display: grid;
    gap: 32px;
    margin-top: 32px;
}

.review {
    padding: 24px;
    background-color: #ffffff;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.review__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.review__name {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 18px;
}

.review__rating {
    font-size: 16px;
}

.review__quote {
    font-style: italic;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: 16px;
}

/* ===== ADVANTAGES ===== */
.advantages {
    padding: 80px 0;
}

.advantages__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 48px;
}

.advantage {
    padding: 32px;
    background-color: #ffffff;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.advantage h3 {
    color: var(--color-primary);
    margin-bottom: 16px;
}

.advantage p {
    color: var(--color-text-light);
    font-size: 16px;
    line-height: 1.6;
}

/* ===== FAQ ===== */
.faq {
    padding: 80px 0;
}

.faq__list {
    display: grid;
    gap: 32px;
}

.faq__item {
    padding: 24px;
    background-color: #ffffff;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.faq__question {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.faq__answer {
    color: var(--color-text-light);
    line-height: 1.6;
}

.faq__answer p {
    margin-bottom: 0;
}

/* ===== RELIABLE SPACE ===== */
.reliable-space {
    padding: 80px 0;
}

.reliable-space__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.reliable-space__image {
    order: 1;
}

.reliable-space__image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    display: block;
    box-shadow: var(--shadow-md);
}

.reliable-space__text {
    order: 2;
}

/* ===== CONTACTS ===== */
.contacts {
    padding: 80px 0;
}

.contacts__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contacts__image {
    order: 1;
}

.contacts__image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    display: block;
    box-shadow: var(--shadow-md);
}

.contacts__text {
    order: 2;
}

.contacts__info {
    display: grid;
    gap: 32px;
    margin-top: 32px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-item__icon {
    font-size: 24px;
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-item__content h3 {
    color: var(--color-primary);
    margin-bottom: 4px;
    font-size: 18px;
}

.contact-item__content p,
.contact-item__content a {
    color: var(--color-text-light);
    text-decoration: none;
    transition: var(--transition);
}

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

/* ===== FOOTER ===== */
.footer {
    background-color: var(--color-text);
    color: white;
    padding: 64px 0 32px 0;
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 48px;
}

.footer__section h3 {
    color: white;
    margin-bottom: 16px;
}

.footer__description {
    color: #cbd5e0;
    margin-bottom: 16px;
}

.footer__links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer__links li {
    margin-bottom: 8px;
}

.footer__links a {
    color: #cbd5e0;
    text-decoration: none;
    transition: var(--transition);
}

.footer__links a:hover,
.footer__links a:focus {
    color: white;
}

.footer__bottom {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid #4a5568;
    text-align: center;
    color: #a0aec0;
}

/* ===== BACK LINK ===== */
.back-link {
    text-align: center;
    margin-top: 48px;
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    /* Burger menu toggle button */
    .nav__toggle {
        display: flex;
    }

    /* Navigation menu */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        max-width: 320px;
        height: 100vh;
        background-color: #ffffff;
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        z-index: 1000;
        padding: 80px 24px 24px;
        overflow-y: auto;
    }

    .nav--open {
        right: 0;
    }

    .nav--open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: -1;
        pointer-events: none;
    }

    .nav__list {
        flex-direction: column;
        gap: 0;
        align-items: flex-start;
        position: relative;
        z-index: 1;
    }

    .nav__item {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }

    .nav__link {
        display: block;
        padding: 16px 0;
        width: 100%;
        font-size: 18px;
    }

    .nav__link::after {
        display: none;
    }

    /* Prevent body scroll when menu is open */
    body.nav-menu-open {
        overflow: hidden;
    }
}

@media (max-width: 1024px) {
    .hero__content,
    .about__content,
    .contact-form__content,
    .reviews__content,
    .contacts__content,
    .reliable-space__content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .advantages__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 1024px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 100px 0 60px 0;
    }

    .hero__title {
        font-size: 32px;
    }

    .section-title {
        font-size: 24px;
    }

    .content-text {
        font-size: 16px;
    }

    .footer__content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
    }

    .pricing__item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .pricing__details {
        margin-right: 0;
    }

    .pricing__price {
        text-align: left;
    }

    .contact-form {
        padding: 24px;
    }

    .reviews__content {
        grid-template-columns: 1fr;
    }

    .faq__question,
    .faq__answer {
        padding-left: 24px;
        padding-right: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .hero__title {
        font-size: 28px;
    }

    .hero__description {
        font-size: 16px;
    }

    .content-text {
        font-size: 16px;
    }

    .contact-form {
        padding: 20px;
    }

    .form-input,
    .form-textarea {
        padding: 10px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .advantage {
        padding: 24px;
    }

    .contact-item {
        flex-direction: column;
        gap: 8px;
    }

    .contact-item__icon {
        align-self: flex-start;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus styles */
.nav__link:focus,
.btn:focus,
.form-input:focus,
.form-textarea:focus,
.faq__question:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --color-text-light: #000000;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .header,
    .nav,
    .footer,
    .btn,
    .video-section {
        display: none !important;
    }

    body {
        font-size: 12pt;
        line-height: 1.4;
    }

    section {
        page-break-inside: avoid;
    }
}