/* 1. CSS переменные по группам */
:root {
  /* Цвета */
  --color-primary: #4299e1;
  --color-accent: #40b526;
  --color-accent-dark: #348842;
  --color-dark: #252d33;
  --color-text-secondary: #4b5563;
  --color-gray: #94a9b7;
  --color-line: #d1dce2;
  --color-light: #f3f7f9;
  --color-white: #ffffff;

  /* Адаптивная типография по размеру */
  --text-12: clamp(0.563rem, 1vw, 0.75rem); /* 9px → 12px */
  --text-14: clamp(0.75rem, 1.17vw, 0.875rem); /* 12px → 14px */
  --text-18: clamp(0.844rem, 1.5vw, 1.125rem); /* 13.5px → 18px */
  --text-20: clamp(0.938rem, 1.67vw, 1.25rem); /* 15px → 20px */
  --text-22: clamp(1.031rem, 1.83vw, 1.375rem); /* ~16.5px → 22px */
  --text-24: clamp(1.125rem, 2vw, 1.5rem); /* 18px → 24px */
  --text-32: clamp(1.5rem, 2.67vw, 2rem); /* 24px → 32px */
  --text-30: clamp(1.406rem, 2.5vw, 1.875rem); /* 22.5px → 30px */
  --text-36: clamp(1.625rem, 2.75vw, 2.25rem); /* 30px → 36px */
  --text-48: clamp(2.25rem, 4vw, 3rem); /* 36px → 48px */

  /* Спэйсинг */
  --space-1: 0.25rem; /* 4px */
  --space-2: 0.5rem; /* 8px */
  --space-3: 0.75rem; /* 12px */
  --space-4: 1rem; /* 16px */
  --space-5: 1.25rem; /* 20px */
  --space-6: 1.5rem; /* 24px */
  --space-7: 2rem; /* 32px */
  --space-8: 2.5rem; /* 40px */
  --space-9: 3rem; /* 48px */
  --space-10: 3.5rem; /* 56px */

  /* Радиус бордера */
  --rounded-sm: 0.5rem; /* 8px */
  --rounded-md: 0.75rem; /* 12px */
  --rounded-lg: 1rem; /* 16px */
  --rounded-xl: 1.25rem; /* 20px */
  --rounded-full: 9999px;

  /* Толщина шрифта */
  --font-regular: 400;
  --font-bold: 700;
}

/* 2. Минимальный сброс */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 3. Базовые стили */
body {
  font-family: 'Roboto', sans-serif;
  font-weight: var(--font-regular);
  color: var(--color-dark);
  background-color: var(--color-light);
}

/* Сброс стилей списка и ссылок */
ul {
  list-style: none;
}
a {
  color: inherit;
  text-decoration: none;
}

/* Удобный сброс для изображений */
img,
picture,
video {
  max-width: 100%;
}

/* Декоративное выделение */
::selection {
  color: var(--color-dark);
  background-color: rgba(64, 181, 38, 0.85);
}

/* 4. Layout utilities */
.container {
  width: 95%;
  margin: 0 auto;
}

/* 5. Компоненты */
/* Header component */
.header {
  margin-top: var(--space-7);
  margin-bottom: 4.5rem;
  font-size: var(--text-24);
  font-weight: var(--font-bold);
  color: var(--color-dark);
}

.header__flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header__logo {
  max-width: 7rem;
  height: 2rem;
}

#open-navbar-button {
  display: block;
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
}

#close-navbar-button {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
}

#close-navbar-button:hover {
  background: var(--color-dark);
}

#overlay {
  position: fixed;
  inset: 0;
  z-index: 9;
  display: none;
  background: rgba(0, 0, 0, 0.5);
}

.header__nav {
  position: fixed;
  top: 0;
  right: -100%;
  height: 100vh;
  width: min(14.25rem, 100%);
  padding: 0 var(--space-4);
  color: var(--color-light);
  background-color: rgba(0, 0, 0, 0.2);
  z-index: 10;
  transition: right 300ms ease-out;
}
.header__nav.show {
  right: 0;
}
.header__nav.show ~ #overlay {
  display: block;
}
.header__nav-item {
  display: flex;
  align-items: center;
}
.header__nav-auth {
  display: flex;
  align-items: center;
}
.header__nav-link {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  transition: color 0.1s ease-in;
}
.header__nav-link:hover {
  color: var(--color-accent);
}
/* Эффект подчеркивания */
.header__nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease-in-out;
}
.header__nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}
.header__img-link {
  font-size: 0;
}
.header__img {
  max-width: none;
}

.header__dropdown-icon {
  margin-left: var(--space-2);
  transform: rotate(180deg);
  transition: all 0.2s ease-in;
}

.header__nav-link:hover .header__dropdown-icon {
  transform: rotate(-0deg);
}

/* Menu component */
.menu {
  color: var(--color-dark);
  font-size: var(--text-48);
  font-weight: var(--font-bold);
  margin-bottom: 2.125rem;
}
.menu__nav-link {
  position: relative;
  transition: color 0.1s ease-in;
}
.menu__nav-link:hover {
  color: var(--color-accent);
}
/* Эффект подчеркивания */
.menu__nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 4px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease-in-out;
}
.menu__nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}
.menu__nav-link--active {
  color: var(--color-gray);
}

/* Main component */
.main {
  color: var(--color-white);
}
.main__flex {
  padding: var(--space-5);
  border-radius: var(--rounded-lg);
  background-image: image-set(url(assets/img/main-bg.webp), url(assets/img/main-bg.png));
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
.main__book-container {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 0.9375rem;
  margin-bottom: 1.875rem;
}
.main__book-number {
  font-size: var(--text-36);
  font-weight: var(--font-bold);
}
.main__new-flow {
  width: max-content;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.main__new-flow-text {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  color: var(--color-dark);
  background: var(--color-white);
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: var(--font-bold);
  letter-spacing: 3px;
}
.main__new-flow-date {
  font-size: 0.875rem;
}
.main__new-flow-modules {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
}
.main__new-flow-hours {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
}
.main__description {
  font-size: 1.875rem;
  margin-bottom: var(--space-6);
}
.main__cta-button-container {
  margin-bottom: var(--space-6);
}
.main__cta-button {
  display: inline-block;
  padding: var(--space-1) var(--space-4);
  margin-right: var(--space-4);
  margin-bottom: var(--space-3);
  border: 2px solid var(--color-white);
  border-radius: var(--rounded-full);
  background-color: transparent;
  color: var(--color-white);
  font-size: var(--text-18);
  font-weight: var(--font-bold);
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}
.main__button-payment-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
}
.main__default-button {
  display: inline-block;
  padding: var(--space-4) var(--space-7);
  border: 2px solid transparent;
  border-radius: var(--rounded-full);
  background-color: var(--color-dark);
  color: var(--color-white);
  font-size: var(--text-18);
  font-weight: var(--font-bold);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}
.main__default-button:hover {
  border: 2px solid var(--color-accent);
}
.main__payment-button {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-7);
  border: 2px solid var(--color-white);
  border-radius: var(--rounded-full);
  background-color: transparent;
  color: var(--color-white);
  font-size: var(--text-18);
  font-weight: var(--font-bold);
  white-space: nowrap;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}
.main__payment-button:hover {
  background-color: rgba(0, 0, 0, 0.7);
}

/* Course Program component */
.course {
  padding: 4rem 0;
}
.course__description {
  color: var(--color-dark);
  font-size: var(--text-18);
  margin-bottom: var(--space-5);
}
.program {
  margin-bottom: var(--space-3);
}
.program__title {
  font-size: var(--text-48);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-6);
}
.program__section {
  margin-bottom: var(--space-5);
}
.program__section-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-30);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-6);
  cursor: pointer;
}
.program__section-title::selection {
  background: transparent;
  color: inherit;
  text-shadow: none;
}
.program__section-icon {
  transform: rotate(-180deg);
  transition: all 0.2s linear;
}
.program__section-icon--rotated {
  transform: rotate(0deg);
}
.program__lectures--hidden {
  display: none;
}
.program__lecture {
  position: relative;
  margin-bottom: 3.25rem;
}
.program__lecture::after {
  content: '';
  position: absolute;
  bottom: -26px;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--color-line);
}
.program__lecture-video-container {
  position: relative;
  display: inline-block;
}
.program__lecture-video {
  min-width: 7.5rem;
  border-radius: var(--rounded-sm);
}
.program__lecture-icon {
  position: absolute;
  right: 0;
  bottom: 0;
  transform: translate(-30%, -40%);
}
.program__lecture-title {
  font-size: var(--text-18);
  font-weight: var(--font-bold);
}
.program__final {
  padding: 1.5625rem 1.4375rem 1.3125rem;
  border: 0.0625rem solid var(--color-gray);
  border-radius: var(--rounded-xl);
  font-weight: var(--font-bold);
}
.program__final-description {
  color: var(--color-gray);
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.program__final-title {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.875rem;
  font-size: var(--text-30);
  margin-bottom: var(--space-3);
}
.program__final-detail {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  font-size: var(--text-18);
}

.course__payment {
  width: 100%;
  max-width: 20rem;
  padding: 1.5rem 1.875rem;
  background-color: var(--color-white);
  border-radius: var(--rounded-md);
}
.course__payment-heading {
  font-size: var(--text-30);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-3);
}
.course__payment-info {
  color: var(--color-text-secondary);
  font-size: var(--text-18);
  margin-bottom: var(--space-5);
}
.course__payment-link {
  color: var(--color-accent);
  transition: all 0.2s ease-in;
}
.course__payment-link:hover {
  color: var(--color-dark);
  text-decoration: underline;
}
.course__payment-price {
  font-size: var(--text-48);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-5);
}
.course__payment-button {
  display: flex;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-4) var(--space-7);
  margin-bottom: var(--space-3);
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: var(--text-18);
  font-weight: var(--font-bold);
  border-radius: var(--rounded-full);
  white-space: nowrap;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease-in-out;
}
.course__payment-button:hover {
  background-color: var(--color-accent-dark);
}
.course__payment-button svg {
  flex-shrink: 0; /* Prevent SVG from shrinking */
}
.course__payment-promo {
  display: block;
  color: var(--color-accent);
  font-size: var(--text-18);
  font-weight: var(--font-bold);
  text-align: center;
  transition: color 0.1s ease-in;
}
.course__payment-promo:hover {
  color: var(--color-dark);
}

/* Discount component */
.discount {
  padding: 2.5625rem 0;
  margin-bottom: 5rem;
  background: var(--color-dark);
  color: var(--color-gray);
}

.discount__subtitle {
  margin-bottom: var(--space-4);
  font-size: 0.875rem;
}

.discount__title {
  color: var(--color-white);
  font-size: var(--text-36);
  margin-bottom: 1.3125rem;
}

.discount__description {
  font-size: var(--text-18);
  margin-bottom: var(--space-4);
}

.discount__video {
  width: 100%;
  height: 300px;
  object-fit: cover;
  object-position: center;
}

/* Speakers component */
.speakers {
  margin-bottom: 5rem;
}
.speakers__title {
  margin-bottom: 2rem;
}
.speakers__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18.75rem, 1fr));
  gap: var(--space-7);
}
.speakers__card {
  padding: var(--space-4);
  background: var(--color-white);
  border-radius: var(--rounded-lg);
}
.speakers__img {
  margin-bottom: var(--space-2);
}
.speakers__name {
  font-size: var(--text-22);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-2);
}
.speakers__description {
  color: var(--color-gray);
  font-size: 0.875rem;
  line-height: 1.5;
  letter-spacing: 1px;
  margin-bottom: var(--space-2);
}

/* Sponsors component */
.sponsors {
  margin-bottom: 5rem;
}
.sponsors__title {
  margin-bottom: 2.125rem;
}
.sponsors__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18.75rem, 1fr));
  gap: var(--space-7);
}
.sponsors__card {
  display: grid;
  place-items: center;
}
.sponsors__logo {
  max-width: 100%;
}

/* Partners component */
.partners {
  margin-bottom: 5rem;
}
.partners__title {
  margin-bottom: 1.5rem;
}
.partners__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18.75rem, 1fr));
  gap: var(--space-7);
}
.partners__card {
  display: grid;
  place-items: center;
  background: var(--color-white);
}

/* 6. Медиа запросы */

@media (min-width: 48rem) {
  body {
    line-height: 1.4;
  }
  .header {
    font-size: 0.75rem;
  }
  .main__flex {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .main__logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50%;
  }
  .main__description {
    font-size: var(--text-48);
  }
  .menu {
    font-size: var(--text-36);
  }
  .program__lecture {
    display: flex;
    align-items: center;
    gap: var(--space-6);
  }
  .program__final-details {
    display: flex;
    align-items: center;
    gap: var(--space-3);
  }
  .main__flex {
    padding: 2.5rem;
  }
  .main__content {
    width: 50%;
  }
  .menu__nav-list {
    display: flex;
    align-items: center;
    gap: 2rem;
  }
  .discount__content {
    align-self: flex-start;
  }

  .discount__video {
    max-width: 470px;
  }

  .course-flex {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
  }
  .course__content {
    width: 65%;
  }
  .course__payment {
    width: 35%;
  }
  .main__new-flow {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    flex-direction: row;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
  }
  .header__nav {
    color: var(--color-dark);
    display: flex;
    position: static;
    width: 100%;
    height: auto;
    margin-left: 0;
    padding: 0;
    background-color: transparent;
    justify-content: space-between;
  }
  .header__nav-list {
    display: flex;
    gap: var(--space-3);
    align-self: flex-start;
  }
  .header #open-navbar-button,
  #close-navbar-button {
    display: none;
  }
}

@media (min-width: 62.5rem) {
  .header {
    font-size: 0.875rem;
  }
  .header__nav-list {
    gap: var(--space-7);
  }
  .menu {
    font-size: var(--text-48);
  }
  .main__cta-button-container {
    margin-bottom: 5.5rem;
  }

  .discount__flex {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-7);
  }
}

@media (min-width: 75rem) {
  .header {
    font-size: 1.125rem;
  }
  .header__nav {
    margin-left: 95px;
  }
  .course__description {
    margin-bottom: var(--space-10);
  }
  .speakers__card {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.25rem;
  }
}

@media (min-width: 92rem) {
  .container {
    width: 83%;
  }
}