:root {
  /* --- Фон и Поверхности --- */
  --bg-page: #FFFFFF;
  --bg-surface-soft: #EAEEFA;
  --bg-surface-card: #FFFFFF;
  --bg-header-footer: #0057B7;
  --bg-gradient-slider: linear-gradient(90deg, #FADBFE 0.48%, #B9D1FE 100%);

  /* --- Типографика и Текстовые оттенки --- */
  --text-primary: #111827;
  --text-dark: #000000;
  --text-secondary: #1E293B;
  --text-muted: #66788A;
  --text-disclaimer: #666666;
  --text-white: #FFFFFF;
  --text-inactive: #CCCCCC;

  /* --- Акцентные цвета и Брендинг --- */
  --accent-primary: #0079FF;
  --accent-hover: #0057B7;
  --accent-secondary: #0EA2FF;
  --accent-glow: rgba(0, 121, 255, 0.25);

  /* --- Состояния и Валидация (Defensive UI) --- */
  --color-error: #E53935;
  --color-error-bg: #FFF5F5;
  --color-success: #10B981;
  --color-disabled: #CCCCCC;
  --color-disabled-text: #FFFFFF;

  /* --- Границы и Разделители --- */
  --border-blue: 2px solid #0079FF;
  --border-white: 4px solid #FFFFFF;
  --border-input: 1px solid #D1D5DB;
  --border-input-focus: 2px solid #0079FF;
  --border-input-error: 2px solid #E53935;

  /* --- Тени и Глубина (Elevations) --- */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 121, 255, 0.16);
  --shadow-card-hover: 0 8px 24px rgba(0, 87, 183, 0.14);
  --shadow-bubble: 0 10px 25px rgba(0, 0, 0, 0.15);

  /* --- Временные функции анимаций (Motion) --- */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

:where(#main, #main *, #main *::before, #main *::after) {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color: var(--text-dark);
  background-color: var(--bg-page);
}

body {
  font-family: DINPro, Arial, sans-serif;
  font-weight: 400;
  line-height: 1.35;
  color: var(--text-dark);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:where(#main) a {
  color: inherit;
  text-decoration: none;
}

:where(#main) img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Распорка под единый фиксированный хедер (70px) */
.fix_height_ {
  width: 100%;
  height: 70px;
}

/* ==========================================================================
   1. HERO SECTION (#hero)
   ========================================================================== */
.hero-wrapper {
  background: var(--bg-surface-soft);
  width: 100%;
}

.block1 {
  padding-top: 50px;
  padding-bottom: 50px;
  margin-left: 10vw;
  margin-right: 10vw;
  display: flex;
  flex-direction: row;
}

.block1_left {
  width: 40%;
  min-height: 520px;
  background-image: url('img/hero-specialist.jpg');
  background-position: top right;
  background-repeat: no-repeat;
  background-size: cover;
}

.block1_right {
  display: flex;
  flex-direction: column;
  margin-left: 80px;
  width: 60%;
  justify-content: center;
}

.block1_right_title {
  font-size: 58px;
  line-height: 1.15;
  font-weight: 400;
  color: var(--text-dark);
}

.accent-blue {
  color: var(--accent-primary);
  font-weight: 500;
}

.block1_right_img {
  display: none;
}

.block1_right_rectangles {
  display: flex;
  flex-direction: row;
  margin: 60px -10px 0 -10px;
  justify-content: space-between;
}

.block1_right_rectangle {
  background: var(--bg-surface-card);
  margin-left: 10px;
  margin-right: 10px;
  width: 33.333%;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.block1_right_rectangle:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.block1_right_rectangle_text {
  padding: var(--iridi-grid-card-padding);
  font-size: var(--iridi-desc-font-size);
  line-height: 1.35;
  color: var(--text-dark);
}

.block1_right_button {
  margin-top: 80px;
  display: flex;
  justify-content: flex-end;
}

.block1_right_button_button {
  background: var(--accent-primary);
  display: inline-block;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.block1_right_button_button:hover {
  background: var(--accent-hover);
}

.block1_right_button_button_text {
  padding: 12px 42px;
  color: var(--text-white);
  font-size: 24px;
  text-align: center;
}

.block1_right_button_mobil {
  display: none;
}

/* ==========================================================================
   2. FEATURES SECTION (#features)
   ========================================================================== */
.block2-wrapper {
  background: var(--bg-page);
}

.block2 {
  padding: var(--iridi-block-padding);
  padding-bottom: 0;
  margin-bottom: 0;
}

.block2_els {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  row-gap: var(--iridi-grid-row-gap);
  column-gap: var(--iridi-grid-column-gap);
}

.block2_el {
  border: var(--border-blue);
  background: var(--bg-surface-card);
  width: 100%;
  padding: var(--iridi-grid-card-padding);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.block2_el:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.block2_el_content {
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.block2_el_content_img {
  min-width: 50px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.block2_el_content_img img {
  height: 36px;
  width: auto;
}

.block2_el_content_text {
  padding-top: 20px;
  text-align: center;
  font-size: var(--iridi-desc-font-size);
  line-height: 1.4;
  color: var(--text-secondary);
}

/* ==========================================================================
   3. STEPS / SLIDER SECTION (#steps)
   ========================================================================== */
.block3-wrapper {
  background: var(--bg-page);
}

.block3 {
  padding: var(--iridi-block-padding);
  padding-bottom: 0;
  min-height: 0;
  margin-bottom: 0;
}

.block3_title {
  font-size: var(--iridi-title-font-size);
  text-align: center;
  font-weight: var(--iridi-title-font-weight);
  color: var(--text-dark);
}

.block3_content {
  display: flex;
  flex-direction: row;
  margin-top: 120px;
  margin-bottom: 0;
  align-items: center;
}

.block3_content_img {
  width: 50%;
  background: var(--bg-gradient-slider);
  margin-left: -10vw;
  min-height: 280px;
  display: flex;
  align-items: center;
}

.block3_content_img_position {
  display: flex;
  margin-right: 40px;
  margin-bottom: 40px;
  margin-top: -90px;
  margin-left: 10vw;
  justify-content: flex-end;
  position: relative;
  width: 100%;
}

.slider-img-container {
  position: relative;
  min-height: 300px;
  display: grid;
  align-items: end;
  justify-items: end;
}

.slider-img-container img {
  grid-area: 1 / 1;
  max-width: 100%;
  height: auto;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.65s ease, visibility 0s linear 0.65s;
}

.slider-img-container img.active {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.65s ease, visibility 0s;
}

.block3_content_right {
  width: 50%;
  display: flex;
  flex-direction: column;
  margin-left: 10vw;
  justify-content: space-between;
}

.block3_content_right_title {
  font-size: var(--iridi-h3-font-size);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.06em;
  color: var(--text-dark);
}

.title1,
.text1 {
  display: grid;
}

.title1 div,
.text1 div {
  grid-area: 1 / 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.55s ease, transform 0.55s ease, visibility 0s linear 0.55s;
}

.title1 div.active,
.text1 div.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.55s ease, transform 0.55s ease, visibility 0s;
}

.block3_content_right_desc {
  font-size: var(--iridi-desc-font-size);
  line-height: 1.45;
  margin-top: var(--iridi-desc-margin-top);
  color: var(--text-secondary);
}

.block3_content_right_pagin {
  margin-top: 40px;
}

.block3_content_right_page {
  color: var(--text-inactive);
  font-size: 32px;
  font-weight: 500;
  margin-right: 40px;
  cursor: pointer;
  transition: color var(--transition-fast);
  user-select: none;
}

.block3_content_right_page:hover {
  color: var(--accent-primary);
}

.block3_content_right_page.active {
  color: var(--accent-primary);
}

/* ==========================================================================
   4. PROJECTS GALLERY SECTION (#projects)
   ========================================================================== */
.block4 {
  padding: var(--iridi-block-padding);
  padding-bottom: 80px;
  min-height: 0;
  margin-bottom: 0;
}

.block4_title {
  font-size: var(--iridi-title-font-size);
  text-align: center;
  font-weight: var(--iridi-title-font-weight);
  color: var(--text-dark);
}

.projects-carousel-shell {
  position: relative;
  margin-top: 80px;
}
.projects-carousel__controls {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}
.projects-carousel__arrow {
  display: grid;
  place-items: center;
  position: absolute;
  top: 50%;
  width: 48px;
  height: 48px;
  transform: translateY(-50%);
  pointer-events: auto;
  border: 2px solid var(--accent-primary);
  border-radius: 50%;
  background: var(--bg-surface-card);
  color: var(--accent-primary);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}
.projects-carousel__arrow--prev { left: -68px; }
.projects-carousel__arrow--next { right: -68px; }
.projects-carousel__arrow svg { width: 24px; height: 24px; }
.projects-carousel__arrow:hover {
  background: var(--accent-primary);
  color: var(--text-white);
  box-shadow: var(--shadow-card-hover);
}
.projects-carousel__arrow:focus-visible {
  outline: 3px solid var(--accent-hover);
  outline-offset: 3px;
}
.projects-carousel {
  overflow: hidden;
  touch-action: pan-y;
  user-select: none;
}

.projects-carousel__track {
  display: flex;
  gap: 24px;
  align-items: stretch;
  transition: transform 0.7s cubic-bezier(0.25, 0.8, 0.25, 1);
  will-change: transform;
}

.project-card {
  flex: 0 0 calc((100% - 72px) / 4);
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-surface-card);
  color: var(--text-secondary);
  border: 1px solid #dce5f1;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.project-card:hover {
  box-shadow: var(--shadow-card-hover);
}

.project-card:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: -3px;
}

.project-card__image {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.project-card__caption {
  display: block;
  flex: 1;
  padding: 20px;
  font-size: var(--iridi-desc-font-size);
  line-height: 1.3;
}

@media (max-width: 1300px) {
  .project-card { flex-basis: calc((100% - 48px) / 3); }
}

@media (max-width: 1000px) {
  .block4 { padding-bottom: 50px; }
  .projects-carousel-shell { margin-top: 50px; }
  .projects-carousel__arrow--prev { left: -56px; }
  .projects-carousel__arrow--next { right: -56px; }
  .projects-carousel__track { gap: 20px; }
  .project-card { flex-basis: calc((100% - 20px) / 2); }
}

@media (max-width: 600px) {
  .block3_content_right_pagin { display: none; }
  .projects-carousel__track { gap: 16px; }
  .project-card { flex-basis: 100%; }
  .projects-carousel__arrow { width: 44px; height: 44px; }
  .projects-carousel__arrow--prev { left: -30px; }
  .projects-carousel__arrow--next { right: -30px; }
}

/* ==========================================================================
   5. LEAD CAPTURE FORM SECTION (#form_reg)
   ========================================================================== */
.form_request_wrapper {
  background: var(--bg-page);
  padding: 60px 0;
}

.form_request {
  margin-left: 10vw;
  margin-right: 10vw;
}

.form_request_in {
  background: var(--bg-surface-soft);
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  gap: 32px;
  padding: 60px;
}

.form_request_l {
  width: calc(50% - 16px);
}

.form_request_l_in {
  display: flex;
  flex-direction: column;
}

.form_request_title {
  font-size: var(--iridi-title-font-size);
  color: var(--text-primary);
  font-weight: var(--iridi-title-font-weight);
  margin-bottom: 20px;
}

.form_request_desc {
  font-size: var(--iridi-desc-font-size);
  line-height: 1.45;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.form_disclaimer {
  display: block;
  font-size: 14px;
  color: var(--text-disclaimer);
  margin-top: 15px;
  line-height: 1.4;
}

.form_disclaimer a {
  color: var(--accent-hover);
  text-decoration: underline;
}

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

.form_request_pic_mobile {
  display: none;
}

.form_request_form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 10px;
}

.form_request_form_el {
  display: flex;
  flex-direction: row;
  gap: 16px;
  width: 100%;
}

.form_request_form input[type="text"],
.form_request_form input[type="email"] {
  background: var(--bg-surface-card);
  border: var(--border-input);
  color: var(--text-primary);
  height: 52px;
  padding: 0 16px;
  font-size: 18px;
  font-family: inherit;
  width: 100%;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form_request_form input[type="text"]::placeholder,
.form_request_form input[type="email"]::placeholder {
  color: var(--text-muted);
}

.form_request_form input[type="text"]:focus,
.form_request_form input[type="email"]:focus {
  border: var(--border-input-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form_request_form input.bad {
  border: var(--border-input-error) !important;
  background-color: var(--color-error-bg) !important;
}

.form_request_btn {
  width: 100%;
  border: 0;
  font-family: inherit;
  background: var(--accent-primary);
  color: var(--text-white);
  font-size: 20px;
  padding: 14px 44px;
  text-align: center;
  cursor: pointer;
  display: inline-block;
  user-select: none;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.form_request_btn:hover {
  background: var(--accent-hover);
}

.form_request_btn:active {
  transform: scale(0.98);
}

.form_request_btn.disabled {
  background: var(--color-disabled);
  color: var(--color-disabled-text);
  pointer-events: none;
  cursor: wait;
}

.request_form_error {
  color: var(--color-error);
  font-size: 16px;
  margin-top: 10px;
  font-weight: 500;
}

.request_form_thank {
  padding: 30px;
  background: var(--bg-surface-card);
  border-left: 4px solid var(--accent-primary);
  box-shadow: var(--shadow-sm);
  margin-top: 20px;
}

.request_form_thank h3 {
  color: var(--text-primary);
  margin-bottom: 12px;
}

.request_form_thank p {
  font-size: 18px;
  line-height: 1.5;
  color: var(--text-secondary);
}

.request_form_thank a {
  color: var(--accent-secondary);
  font-weight: 500;
  text-decoration: underline;
}

.form_request_r {
  position: relative;
  width: calc(50% - 16px);
}

.form_request_pic {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.form_request_pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   6. RESPONSIVE BREAKPOINTS
   ========================================================================== */

/* 1741px - 1800px */
@media (min-width: 1741px) and (max-width: 1800px) {
  .block1_right_title {
    font-size: 52px;
  }
}

/* 1441px - 1740px */
@media (min-width: 1441px) and (max-width: 1740px) {
  .block1_right_title {
    font-size: 46px;
  }
  .block4_circles {
    margin-right: -50px;
  }
  .block4_circle {
    margin-left: -50px;
  }
}

/* 1270px - 1440px */
@media (min-width: 1270px) and (max-width: 1440px) {
  .block1_right_title {
    font-size: 40px;
  }
  .block4_circles {
    margin-right: -50px;
  }
  .block4_circle {
    margin-left: -70px;
  }
}

/* 1200px - 1700px */
@media (min-width: 1200px) and (max-width: 1700px) {
  .block1_right {
    margin-left: 40px;
  }
  .block1_right_rectangles {
    margin: 40px -10px 0 -10px;
  }
  .block1_right_button {
    margin-top: 50px;
  }
}

/* 1020px - 1270px */
@media (min-width: 1020px) and (max-width: 1270px) {
  .block4_circles {
    margin-right: -50px;
  }
  .block4_circle {
    margin-left: -50px;
  }
  .block4_circle_img {
    height: 120px;
    width: 120px;
  }
  .block4_circle_text {
    width: 240px;
  }
  .block4_circle:hover .block4_circle_text {
    opacity: 1;
    top: 200px;
  }
  .block4_circle:hover .block4_circle_img {
    height: 240px;
    width: 240px;
    margin-top: -60px;
  }
}

/* Tablets <= 1200px */
@media (max-width: 1200px) {
  .block3_content {
    touch-action: pan-y;
    user-select: none;
  }
  .block1 {
    flex-direction: column;
  }
  .block1_left {
    display: none;
  }
  .block1_right {
    width: 100%;
    margin-left: 0;
  }
  .block1_right_img {
    display: block;
    margin-top: 40px;
    min-height: 350px;
    background-image: url('img/hero-specialist.jpg');
    background-position: top center;
    background-repeat: no-repeat;
    background-size: cover;
  }
  .form_request_in {
    flex-direction: column;
    padding: 40px;
  }
  .form_request_l {
    width: 100%;
  }
  .form_request_r {
    display: none;
  }
  .form_request_pic_mobile {
    display: block;
    margin: 20px 0;
    text-align: center;
  }
  .form_request_pic_mobile img {
    margin: 0 auto;
    max-height: 220px;
  }
}

/* <= 960px */
@media (max-width: 960px) {
  .block1_right_title {
    font-size: 36px;
  }
  .block1_right_rectangles {
    flex-direction: column;
    margin: 30px 0 0 0;
    gap: 12px;
  }
  .block1_right_rectangle {
    width: 100%;
    margin-left: 0;
    margin-right: 0;
    margin-bottom: 0;
  }
  .block1_right_rectangle_text {
    text-align: center;
    font-size: 18px;
  }
  .block1_right_button {
    display: none;
  }
  .block1_right_button_mobil {
    display: block;
    width: 100%;
    margin-top: 30px;
    background: var(--accent-primary);
    transition: background var(--transition-fast);
  }
  .block1_right_button_mobil:hover {
    background: var(--accent-hover);
  }
  .block1_right_button_mobil_text {
    color: var(--text-white);
    font-size: 24px;
    text-align: center;
    padding: 16px 0;
  }

  /* Block 2 Features */
  .block2_els {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .block2_el_content {
    flex-direction: row;
    align-items: center;
  }
  .block2_el_content_text {
    padding-top: 0;
    text-align: left;
    padding-left: 20px;
  }

  /* Block 3 Slider */
  .block3_content {
    flex-direction: column;
    margin-top: 60px;
  }
  .block3_content_img {
    width: 100%;
    margin-left: 0;
  }
  .block3_content_img_position {
    margin-left: 0;
    margin-right: 0;
    margin-top: -50px;
    justify-content: center;
  }
  .block3_content_right {
    width: 100%;
    margin-left: 0;
    margin-top: 40px;
  }

  /* Form */
  .form_request_form_el {
    flex-direction: column;
  }
  .form_request_btn {
    width: 100%;
  }
}

/* Ultra-compact Mobile <= 480px */
@media (max-width: 480px) {
  .block1 {
    margin-left: 5vw;
    margin-right: 5vw;
    padding-top: 30px;
  }
  .block1_right_title {
    font-size: 28px;
  }
  .form_request {
    margin-left: 5vw;
    margin-right: 5vw;
  }
  .form_request_in {
    padding: 30px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .slider-img-container img,
  .title1 div,
  .text1 div {
    transition: none;
    transform: none;
  }
  .projects-carousel__track,
  .projects-carousel__arrow {
    transition: none;
  }
}