/* =================================
   GLOBAL STYLES (ETAP 0)
   ================================= */
:root {
    --background-color: rgb(17, 24, 39);
    --text-color: rgb(229, 231, 235);
    --primary-color: rgb(34, 197, 94);
    --primary-hover-color: rgb(22, 163, 74);
    --secondary-color: rgb(75, 85, 99);
    --surface-color: rgb(31, 41, 55);
    --border-color: rgb(55, 65, 81);

    --font-family-base: 'Inter', sans-serif;
    --font-family-heading: 'Roboto Mono', monospace;
    
    --header-height: 70px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family-base);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-color);
}

ul {
    list-style: none;
}

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

/* =================================
   HEADER (ETAP 1)
   ================================= */
.header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: var(--header-height);
    background-color: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.header__logo {
    font-family: var(--font-family-heading);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.header__logo:hover {
    color: var(--text-color);
}

.header__nav {
    display: none; /* Mobile first: hide navigation by default */
}

.header__nav-list {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.header__nav-link {
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
}

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease-in-out;
}

.header__nav-link:hover::after {
    width: 100%;
}

.header__nav-link--cta {
    background-color: var(--primary-color);
    color: var(--background-color);
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.header__nav-link--cta:hover {
    background-color: var(--primary-hover-color);
    color: var(--background-color);
}

.header__nav-link--cta::after {
    display: none;
}

.header__menu-button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    display: block; /* Show on mobile */
}

/* Desktop styles for header */
@media (min-width: 768px) {
    .header__nav {
        display: block;
    }
    .header__menu-button {
        display: none;
    }
}


/* =================================
   FOOTER (ETAP 2)
   ================================= */
.footer {
    background-color: var(--surface-color);
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.footer__container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 640px) {
    .footer__container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer__container {
        grid-template-columns: 2fr 1fr 1fr 1.5fr;
        gap: 2rem;
    }
}

.footer__logo {
    font-family: var(--font-family-heading);
    font-size: 1.75rem;
    display: inline-block;
    margin-bottom: 1rem;
}

.footer__logo:hover {
    color: var(--text-color);
}

.footer__copy {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.footer__title {
    font-family: var(--font-family-heading);
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    color: var(--text-color);
}

.footer__list {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer__link {
    color: var(--secondary-color);
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.footer__link:hover {
    color: var(--primary-color);
}

.footer__icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.footer__address {
    color: var(--secondary-color);
    font-size: 0.95rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    line-height: 1.5;
}
/* =================================
   HERO SECTION (ETAP 3)
   ================================= */
.hero {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 0;
}

.hero__container {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 800px;
}

.hero__title {
    font-family: var(--font-family-heading);
    font-size: 2.5rem; /* Base font size for mobile */
    font-weight: 500;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    min-height: 100px; /* Reserve space to prevent layout shift */
}

.hero__cursor {
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    from, to { color: transparent }
    50% { color: var(--primary-color) }
}

.hero__subtitle {
    font-size: 1.1rem;
    color: var(--secondary-color);
    line-height: 1.7;
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero__cta-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--background-color);
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 2.5rem;
    border-radius: 8px;
    transition: transform 0.3s ease, background-color 0.3s ease;
    border: 2px solid var(--primary-color);
}

.hero__cta-button:hover {
    background-color: var(--primary-hover-color);
    border-color: var(--primary-hover-color);
    color: var(--background-color);
    transform: translateY(-3px);
}

/* Responsive styles for Hero */
@media (min-width: 768px) {
    .hero__title {
        font-size: 3.5rem;
        min-height: 120px;
    }
    .hero__subtitle {
        font-size: 1.25rem;
    }
}
/* =================================
   FEATURES SECTION (AI в быту)
   ================================= */
.features {
    padding: 5rem 0;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.features__header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.features__title {
    font-family: var(--font-family-heading);
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.features__subtitle {
    color: var(--secondary-color);
    font-size: 1.1rem;
    line-height: 1.7;
}

.features__grid {
    display: grid;
    gap: 2rem;
}

/* Grid layout for tablets and desktops */
@media (min-width: 768px) {
    .features__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.features__card {
    background-color: var(--background-color);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, border-color 0.3s ease;
    text-align: center;
}

.features__card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.features__card-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    margin-bottom: 1.5rem;
    background-color: var(--surface-color);
    border-radius: 50%;
    color: var(--primary-color);
}

.features__card-icon i {
    width: 32px;
    height: 32px;
}

.features__card-title {
    font-family: var(--font-family-heading);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.features__card-description {
    color: var(--secondary-color);
    font-size: 0.95rem;
    line-height: 1.6;
}
/* =================================
   ROADMAP SECTION (Карьерный трек)
   ================================= */
.roadmap {
    padding: 5rem 0;
    /* Using the main background color */
}

.roadmap__header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.roadmap__title {
    font-family: var(--font-family-heading);
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.roadmap__subtitle {
    color: var(--secondary-color);
    font-size: 1.1rem;
    line-height: 1.7;
}

.roadmap__timeline {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.roadmap__item {
    position: relative;
    padding-left: 3.5rem; /* Space for the number and line */
}

.roadmap__item-number {
    position: absolute;
    left: 0;
    top: -5px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    color: var(--primary-color);
    background-color: var(--background-color);
    font-family: var(--font-family-heading);
    font-size: 1rem;
    font-weight: 600;
    z-index: 2;
}

.roadmap__item-title {
    font-family: var(--font-family-heading);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.roadmap__item-description {
    color: var(--secondary-color);
    font-size: 0.95rem;
}

/* Vertical line for mobile */
.roadmap__timeline::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 19px; /* (40px width / 2) - 1px border */
    width: 2px;
    height: calc(100% - 40px);
    background-color: var(--border-color);
    z-index: 1;
}

/* Desktop layout for the roadmap */
@media (min-width: 1024px) {
    .roadmap__timeline {
        flex-direction: row;
        gap: 2rem;
    }
    
    .roadmap__item {
        padding-left: 0;
        padding-top: 3.5rem; /* Space for number and line */
        width: 100%;
        text-align: center;
    }

    .roadmap__item-number {
        top: 0;
        left: 50%;
        transform: translateX(-50%);
    }

    /* Horizontal line for desktop */
    .roadmap__timeline::before {
        top: 19px;
        left: 0;
        width: 100%;
        height: 2px;
    }
}
/* =================================
   BOTS SECTION
   ================================= */
.bots-section {
    padding: 5rem 0;
    background-color: var(--surface-color);
}

.bots-section__container {
    display: grid;
    align-items: center;
    gap: 3rem;
}

@media (min-width: 992px) {
    .bots-section__container {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }
}

.bots-section__visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.bots-section__chat-window {
    width: 100%;
    max-width: 400px;
    background-color: var(--background-color);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bots-section__message {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    max-width: 80%;
    line-height: 1.5;
    font-size: 0.9rem;
    opacity: 0;
    animation: slide-up 0.5s forwards ease-out;
}

@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.bots-section__message--outgoing {
    background-color: var(--primary-color);
    color: var(--background-color);
    align-self: flex-end;
    border-bottom-right-radius: 2px;
    animation-delay: 0.2s;
}

.bots-section__message--incoming {
    background-color: var(--surface-color);
    color: var(--text-color);
    align-self: flex-start;
    border-bottom-left-radius: 2px;
    animation-delay: 0.8s;
}

.bots-section__message--incoming:nth-of-type(3) {
    animation-delay: 1.4s;
}

.bots-section__title {
    font-family: var(--font-family-heading);
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
}

.bots-section__description {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.bots-section__cta-button {
    display: inline-block;
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-size: 1rem;
    font-weight: 600;
    padding: 0.9rem 2.4rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.bots-section__cta-button:hover {
    background-color: var(--primary-color);
    color: var(--background-color);
    transform: translateY(-3px);
}

/* =================================
   FAQ SECTION (Техно-консалтинг)
   ================================= */
.faq {
    padding: 5rem 0;
}

.faq__container {
    max-width: 800px; /* Narrower container for better readability */
}

.faq__header {
    text-align: center;
    margin-bottom: 4rem;
}

.faq__title {
    font-family: var(--font-family-heading);
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.faq__subtitle {
    color: var(--secondary-color);
    font-size: 1.1rem;
    line-height: 1.7;
}

.faq__accordion {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq__item {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden; /* Important for the animation */
}

.faq__question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    font-family: var(--font-family-base);
}

.faq__icon {
    flex-shrink: 0;
    margin-left: 1rem;
    transition: transform 0.3s ease-in-out;
}

.faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
}

.faq__answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--secondary-color);
    line-height: 1.7;
}

/* Active state for accordion item */
.faq__item.faq__item--active .faq__icon {
    transform: rotate(180deg);
}

/* =================================
   CONTACT SECTION
   ================================= */
.contact {
    padding: 5rem 0;
    background-color: var(--surface-color);
}

.contact__container {
    display: grid;
    gap: 3rem;
}

@media (min-width: 992px) {
    .contact__container {
        grid-template-columns: 1fr 1fr;
        gap: 5rem;
    }
}

.contact__title {
    font-family: var(--font-family-heading);
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
}

.contact__description {
    color: var(--secondary-color);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact__link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    color: var(--text-color);
}

.contact__link:hover {
    color: var(--primary-color);
}

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

/* Form Styles */
.contact__form-wrapper {
    background-color: var(--background-color);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group__label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.form-group__input {
    width: 100%;
    padding: 0.9rem 1rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group__input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.2);
}

.form-group--checkbox {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.form-group--checkbox input {
    width: 1.25em;
    height: 1.25em;
}
.form-group--checkbox label {
    font-size: 0.9rem;
    color: var(--secondary-color);
}
.form-group--checkbox a {
    color: var(--text-color);
    text-decoration: underline;
}
.form-group--checkbox a:hover {
    color: var(--primary-color);
}

.form-group__error {
    color: #fca5a5; /* Light Red */
    background-color: #7f1d1d; /* Dark Red */
    border: 1px solid #ef4444; /* Red */
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-top: 1.5rem;
}

.contact__submit-button {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--background-color);
    font-size: 1.1rem;
    font-weight: 600;
    padding: 1rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact__submit-button:hover {
    background-color: var(--primary-hover-color);
}

.contact__submit-button:disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
}

.contact__success-message {
    text-align: center;
    border: 1px solid var(--primary-color);
    padding: 2rem;
    border-radius: 8px;
}

/* =================================
   COOKIE POP-UP
   ================================= */
.cookie-popup {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    z-index: 1100;
    transition: transform 0.5s ease-in-out, opacity 0.5s ease-in-out;
    opacity: 1;
    transform: translateY(0);
}

.cookie-popup--hidden {
    opacity: 0;
    transform: translateY(100%);
    pointer-events: none;
}

.cookie-popup__container {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

@media (min-width: 768px) {
    .cookie-popup__container {
        flex-direction: row;
    }
}

.cookie-popup__text {
    color: var(--secondary-color);
    font-size: 0.9rem;
    text-align: center;
}

.cookie-popup__text a {
    color: var(--text-color);
    text-decoration: underline;
}

.cookie-popup__text a:hover {
    color: var(--primary-color);
}

.cookie-popup__button {
    background-color: var(--primary-color);
    color: var(--background-color);
    border: none;
    padding: 0.6rem 1.5rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
    flex-shrink: 0;
}

.cookie-popup__button:hover {
    background-color: var(--primary-hover-color);
}

/* =================================
   PAGES (Privacy, Terms, etc.)
   ================================= */
.pages {
    padding: 4rem 0;
    min-height: 70vh; /* Make sure footer is not too high on short pages */
}

/* Limit the width of the text for better readability */
.pages .container {
    max-width: 800px;
}

.pages h1 {
    font-family: var(--font-family-heading);
    font-size: 2.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.pages h2 {
    font-family: var(--font-family-heading);
    font-size: 1.75rem;
    margin-top: 2.5rem;
    margin-bottom: 1.5rem;
}

.pages p {
    color: var(--secondary-color);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.pages ul {
    list-style-type: disc;
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.pages li {
    margin-bottom: 0.75rem;
    line-height: 1.8;
}

.pages strong {
    color: var(--text-color);
    font-weight: 600;
}

.pages a {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 0.3s ease;
}

.pages a:hover {
    color: var(--primary-hover-color);
}