:root {
    /* Brand */
    --color-accent: #2196F3;
    --color-accent-dark: #0a7cc4;

    /* Backgrounds */
    --color-bg-dark: #2F303A;
    --color-bg-light: #F5F4FA;
    --color-bg-white: #FFFFFF;
    --color-bg-card-border: #EEEEEE;

    /* Text */
    --color-text-primary: #212121;
    --color-text-secondary: #757575;
    --color-text-white: #FFFFFF;
    --color-text-white-muted: rgba(255, 255, 255, 0.6);
    --color-text-black: #000000;

    /* Icons / Borders */
    --color-icon-muted: #AFB1B8;
    --color-border-modal: rgba(33, 33, 33, 0.2);
    --color-border-footer-input: rgba(255, 255, 255, 0.3);
    --color-bg-footer-input: rgba(255, 255, 255, 0.1);
    --color-bg-footer-social: rgba(255, 255, 255, 0.1);
    --color-overlay-services: rgba(47, 48, 58, 0.8);
    --color-overlay-card: rgba(33, 150, 243, 0.9);
    --color-backdrop: rgba(0, 0, 0, 0.2);
    --color-modal-close-border: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: "Roboto";
    font-weight: 400;
    font-size: 14px;
    line-height: 100%;
    letter-spacing: 0.03em;
}

.container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 15px;
    padding-right: 15px;
}

/* HEADER */
/* 1. Gap logo→nav = 93px; nav→contacts = 313px */
.header-inner {
    display: flex;
    align-items: center;
    padding: 25px 0;
}

.header-inner .logo {
    margin-right: 93px;
}

.header-inner .contacts {
    margin-left: 313px;
}

/* 6. Logo letter-spacing 3% */
.logo {
    display: inline-block;
    font-family: "Raleway";
    font-weight: 700;
    color: var(--color-accent);
    font-size: 26px;
    letter-spacing: 0.03em;
    text-decoration: none;
}

.logo::after {
    display: inline;
    content: "Studio";
    color: var(--color-text-black);
    font-family: "Raleway";
    font-weight: 700;
}

.nav-list {
    display: flex;
    flex-direction: row;
    gap: 50px;
}

.main-nav a {
    color: var(--color-text-primary);
    text-decoration: none;
}

.main-nav a:hover {
    color: var(--color-accent);
}

/* 8. Font styles moved from .nav-item (li) to the anchor inside it */
.nav-item a {
    font-family: "Roboto";
    font-weight: 500;
    font-size: 14px;
    line-height: 1.5;
    letter-spacing: 0.02em;
}

.nav-item a.nav-link--active {
    color: var(--color-accent);
    position: relative;
}

.nav-item a.nav-link--active::after {
    content: '';
    position: absolute;
    bottom: -26px;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--color-accent);
    border-radius: 2px;
}

.contact-list {
    display: flex;
    gap: 50px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-icon {
    width: 16px;
    height: 16px;
    fill: var(--color-text-secondary);
    transition: fill 0.3s ease;
}

/* 7. Icon reacts to hover on the whole contact-item */
.contact-item:hover .contact-icon {
    fill: var(--color-accent);
}

.contact-item a {
    color: var(--color-text-secondary);
    transition: color 0.3s ease;
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    line-height: 1.14;
    letter-spacing: 0.02em;
}

.contact-item a:hover {
    color: var(--color-accent);
}

/* HERO */
/* 2. height: 600px -> padding-based */
.hero {
    width: 100%;
    padding-top: 200px;
    padding-bottom: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    text-align: center;
    background-image: url(../images/background.jpg);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-title {
    max-width: 696px;
    font-weight: 900;
    font-size: 44px;
    line-height: 1.36;
    letter-spacing: 0.06em;
    color: var(--color-text-white);
    font-family: "Roboto";
}

/* 2. width/height -> padding */
.hero-btn {
    font-weight: 700;
    font-size: 16px;
    line-height: 30px;
    margin: 30px auto 0;
    display: block;
    border: none;
    border-radius: 4px;
    padding: 10px 32px;
    color: var(--color-text-white);
    background-color: var(--color-accent);
    box-shadow: 10px 2px 5px 0px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    white-space: nowrap;
}

/* FEATURES */
.features {
    font-family: "Roboto";
    padding-top: 94px;
    padding-bottom: 94px;
}

.features-list {
    display: flex;
    gap: 30px;
}

.features-item {
    text-align: center;
    flex: 1;
}

/* 3. Icon box uses ::before instead of <img> */
.features-icon-box {
    max-width: 100%;
    background-color: var(--color-bg-light);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 25px 0;
    margin-bottom: 30px;
}

.features-icon-box img {
    display: none;
}

.features-icon-box::before {
    content: '';
    display: block;
    width: 70px;
    height: 70px;
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;
}

.features-item:nth-child(1) .features-icon-box::before { background-image: url(../images/antenna.svg); }
.features-item:nth-child(2) .features-icon-box::before { background-image: url(../images/clock.svg); }
.features-item:nth-child(3) .features-icon-box::before { background-image: url(../images/diagram.svg); }
.features-item:nth-child(4) .features-icon-box::before { background-image: url(../images/astronaut.svg); }

.features-item-title {
    font-weight: 700;
    font-size: 14px;
    line-height: 100%;
    letter-spacing: 0.03em;
    margin-bottom: 10px;
}

.features-item-text {
    color: var(--color-text-secondary);
    font-weight: 400;
    font-size: 14px;
    line-height: 24px;
    letter-spacing: 0.03em;
}

/* SERVICES */
.services {
    padding-bottom: 94px;
}

.services-item img {
    display: block;
    width: 100%;
    height: 100%;
}

.services-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
}

/* 2. height: 70px -> padding */
.services-label {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 27px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-overlay-services);
    color: var(--color-text-white);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.services-list {
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

.services-item {
    position: relative;
    overflow: hidden;
}

/* TEAM */
.team {
    display: block;
    font-family: "Roboto";
    padding-top: 94px;
    padding-bottom: 94px;
    background-color: var(--color-bg-light);
}

.team-title {
    margin-top: 30px;
    font-weight: 700;
    font-size: 36px;
    line-height: 100%;
    text-align: center;
    margin-bottom: 50px;
}

.team-role {
    font-weight: 400;
    font-size: 16px;
    line-height: 100%;
    color: var(--color-text-secondary);
    margin-top: 10px;
}

.team-list {
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

/* 2. width: 270px -> flex: 1 */
.team-member {
    text-align: center;
    flex: 1;
    background: var(--color-bg-white);
    border-radius: 0 0 4px 4px;
    box-shadow:
        0px 1px 0px 0px rgba(0, 0, 0, 0.20),
        0px 1px 1px 0px rgba(0, 0, 0, 0.14),
        0px 1px 3px 0px rgba(0, 0, 0, 0.12);
}

.team-name {
    font-weight: 500;
    font-size: 16px;
    line-height: 100%;
    color: var(--color-text-primary);
    margin-top: 30px;
}

/* 2. width/height -> aspect-ratio */
.team-image {
    width: 100%;
    aspect-ratio: 270 / 260;
    object-fit: cover;
    display: block;
}

.team-social {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 16px;
    padding-bottom: 30px;
}

/* 2. width/height: 44px -> padding */
.team-social-link {
    padding: 12px;
    border-radius: 50%;
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-icon-muted);
    transition: background-color 0.3s ease, color 0.3s ease;
    text-decoration: none;
}

.team-social-link:hover {
    background-color: var(--color-accent);
    color: var(--color-text-white);
}

.team-social-icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* CLIENTS */
.clients {
    padding: 94px 0;
}

.clients-title {
    font-weight: 700;
    font-size: 36px;
    line-height: 1.17;
    text-align: center;
    letter-spacing: 0.03em;
    color: var(--color-text-primary);
    margin-bottom: 50px;
}

.clients-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.clients-item {
    width: calc(16.666% - 25px);
    min-width: 170px;
}

/* 2. height: 92px -> padding */
.client-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 16px 0;
    border: 1px solid var(--color-icon-muted);
    border-radius: 4px;
    color: var(--color-icon-muted);
    transition: border-color 0.3s ease, color 0.3s ease;
    text-decoration: none;
}

.client-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.client-icon {
    width: 106px;
    height: 60px;
    fill: currentColor;
}

/* FOOTER */
.footer {
    background-color: var(--color-bg-dark);
    padding: 60px 0;
}

.footer .container {
    display: flex;
    align-items: flex-start;
    gap: 70px;
}

.footer-address {
    display: flex;
    flex-direction: column;
    min-width: 231px;
}

.footer .logo {
    display: block;
    font-family: 'Raleway', sans-serif;
    font-weight: 700;
    font-size: 26px;
    color: var(--color-accent);
    text-decoration: none;
    line-height: 1;
    margin-bottom: 9px;
    letter-spacing: 0.03em;
}

.footer .logo::after {
    content: 'Studio';
    color: var(--color-text-white);
}

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

/* 8. Styles from .footer-address-item p moved here */
.footer-address-item {
    margin-bottom: 9px;
    font-size: 14px;
    line-height: 1.71;
    letter-spacing: 0.03em;
    color: var(--color-text-white);
}

.footer-address-item:last-child {
    margin-bottom: 0;
}

.footer-address-item a {
    color: var(--color-text-white-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section-title {
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    color: var(--color-text-white);
    margin: 0 0 20px 0;
    letter-spacing: 0.03em;
}

/* 4. footer social: divs -> ul/li in HTML */
.footer-social-list {
    display: flex;
    gap: 10px;
    list-style: none;
    padding: 0;
    margin: 0;
}

/* 2. width/height: 44px -> padding */
.footer-social-icon-btn {
    padding: 12px;
    border-radius: 50%;
    background-color: var(--color-bg-footer-social);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.footer-social-icon-btn:hover {
    background-color: var(--color-accent);
}

.footer-social-icon {
    width: 20px;
    height: 20px;
    color: var(--color-text-white);
}

.footer-social-icon use {
    fill: var(--color-text-white);
}

.social-section {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.newsletter-section {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    flex: 1;
}

.newsletter-form {
    display: flex;
    gap: 8px;
    width: 100%;
}

/* 2. height: 50px -> padding */
.newsletter-input {
    flex: 1;
    min-width: 0;
    padding: 15px 16px;
    border: 1px solid var(--color-border-footer-input);
    border-radius: 4px;
    background-color: var(--color-bg-footer-input);
    color: var(--color-text-white);
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s ease;
}

.newsletter-input::placeholder {
    color: var(--color-text-white-muted);
}

.newsletter-input:focus {
    border-color: var(--color-accent);
}

/* 2. height: 50px -> padding */
.newsletter-btn {
    min-width: 200px;
    padding: 15px 28px;
    background-color: var(--color-accent);
    color: var(--color-text-white);
    border: none;
    border-radius: 4px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    white-space: nowrap;
}

.newsletter-btn:hover {
    background-color: var(--color-accent-dark);
    box-shadow: 0px 4px 4px 0px rgba(0, 0, 0, 0.15);
}

/* PORTFOLIO PAGE */
.portfolio {
    padding-top: 94px;
}

.card-thumb {
    position: relative;
    overflow: hidden;
}

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-overlay-card);
    padding: 63px 24px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.card-overlay-text {
    font-size: 18px;
    line-height: 1.56;
    letter-spacing: 0.03em;
    color: var(--color-text-white);
}

.card:hover .card-overlay {
    transform: translateY(0);
}

.btn-list {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding-bottom: 50px;
    list-style: none;
    margin: 0;
    padding-left: 0;
}

.btn-item button {
    font-family: "Roboto";
    font-weight: 500;
    font-size: 16px;
    line-height: 1.62;
    letter-spacing: 0.03em;
    padding: 6px 22px;
    background-color: var(--color-bg-light);
    color: var(--color-text-primary);
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-item button:hover {
    background-color: var(--color-accent);
    color: var(--color-text-white);
    font-weight: 500;
    box-shadow:
        0px 2px 2px 0px rgba(0, 0, 0, 0.12),
        0px 1px 2px 0px rgba(0, 0, 0, 0.08),
        0px 3px 1px 0px rgba(0, 0, 0, 0.10);
}

.main {
    padding-bottom: 94px;
}

.main-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.card {
    width: 370px;
    border: 1px solid var(--color-bg-card-border);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

.card:hover {
    box-shadow:
        0px 1px 1px 0px rgba(0, 0, 0, 0.12),
        0px 4px 4px 0px rgba(0, 0, 0, 0.06),
        1px 4px 6px 0px rgba(0, 0, 0, 0.16);
}

.card img {
    width: 100%;
    display: block;
}

.card h2 {
    font-weight: 700;
    font-size: 18px;
    line-height: 2;
    letter-spacing: 0.06em;
    color: var(--color-text-primary);
    margin: 20px 0 4px 24px;
}

.card .card-subtitle {
    font-size: 16px;
    line-height: 1.87;
    letter-spacing: 0.03em;
    color: var(--color-text-secondary);
    margin: 0;
    padding-left: 24px;
    margin-top: auto;
    padding-bottom: 20px;
}

/* BACKDROP */
.backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-backdrop);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* MODAL */
.modal {
    position: relative;
    width: 528px;
    min-height: 581px;
    background-color: var(--color-bg-white);
    border-radius: 4px;
    padding: 40px;
    box-shadow:
        0px 2px 1px rgba(0, 0, 0, 0.2),
        0px 1px 1px rgba(0, 0, 0, 0.14),
        0px 1px 3px rgba(0, 0, 0, 0.12);
}

/* 2. width/height: 30px -> padding */
.modal-close-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 6px;
    border-radius: 50%;
    border: 1px solid var(--color-modal-close-border);
    background-color: var(--color-bg-white);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-black);
    transition: color 0.3s ease, border-color 0.3s ease;
}

.modal-close-btn:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.modal-close-icon {
    display: block;
}

.modal-title {
    font-weight: 700;
    font-size: 20px;
    line-height: 1.15;
    text-align: center;
    letter-spacing: 0.03em;
    color: var(--color-text-primary);
    margin-bottom: 30px;
}

.modal-field {
    margin-bottom: 20px;
}

.modal-label {
    display: block;
    font-size: 12px;
    line-height: 1.17;
    letter-spacing: 0.01em;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.modal-input-wrap {
    position: relative;
}

/* 2. height: 40px -> padding */
.modal-input {
    width: 100%;
    padding: 11px 12px 11px 42px;
    border: 1px solid var(--color-border-modal);
    border-radius: 4px;
    outline: none;
    font-size: 14px;
    color: var(--color-text-primary);
    transition: border-color 0.3s ease;
}

.modal-input:hover,
.modal-input:focus {
    border-color: var(--color-accent);
}

.modal-input:hover + .modal-input-icon,
.modal-input:focus + .modal-input-icon {
    color: var(--color-accent);
}

.modal-input-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-primary);
    pointer-events: none;
    transition: color 0.3s ease;
}

/* 2. height: 120px -> min-height + padding */
.modal-textarea {
    width: 100%;
    min-height: 120px;
    padding: 12px 16px;
    border: 1px solid var(--color-border-modal);
    border-radius: 4px;
    outline: none;
    resize: none;
    font-family: "Roboto", sans-serif;
    font-size: 12px;
    line-height: 1.17;
    letter-spacing: 0.01em;
    color: var(--color-text-primary);
    transition: border-color 0.3s ease;
}

.modal-textarea::placeholder {
    color: rgba(117, 117, 117, 0.5);
}

.modal-textarea:hover,
.modal-textarea:focus {
    border-color: var(--color-accent);
}

.modal-checkbox-wrap {
    margin-bottom: 30px;
}

.modal-checkbox-label {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 14px;
    line-height: 1.71;
    letter-spacing: 0.03em;
    color: var(--color-text-secondary);
    cursor: pointer;
}

.modal-checkbox-input {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    border: 0;
    padding: 0;
    white-space: nowrap;
    clip-path: inset(100%);
    clip: rect(0 0 0 0);
    overflow: hidden;
}

/* 2. width/height -> padding */
.modal-checkbox-custom {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: 2px 1px;
    min-width: 16px;
    min-height: 15px;
    border: 2px solid var(--color-text-primary);
    border-radius: 2px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.modal-checkbox-input:checked + .modal-checkbox-custom {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    background-image: url("data:image/svg+xml,%3Csvg width='11' height='8' viewBox='0 0 11 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 4L4 7L10 1' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

.modal-policy-link {
    color: var(--color-accent);
    text-underline-offset: 2px;
}

/* 2. width/height -> padding */
.modal-submit-btn {
    display: block;
    margin: 0 auto;
    padding: 10px 52px;
    background-color: var(--color-accent);
    color: var(--color-text-white);
    font-weight: 700;
    font-size: 16px;
    line-height: 1.87;
    letter-spacing: 0.06em;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.15);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.modal-submit-btn:hover {
    background-color: var(--color-accent-dark);
    box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.25);
}

.backdrop.is-hidden {
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
}