/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #6161FF;
  --color-text: #323339;
  --color-bg-alt: #F1F3FF;
  --color-bg-main: #ffffff;
  --color-border: #D9D9FF;
  --font-family: 'Roboto', sans-serif;
  --max-width: 80rem; /* 1280px */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --border-radius: 0.5rem;
  --border-radius-full: 2rem;
  --transition: 0.2s ease;
}

/* ===== CSS Reset & Base Styles ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg-main);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style-position: inside;
}

/* ===== Utility Classes ===== */
.block {
  display: block;
}

.text-accent {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-bg-alt);
  padding: 0.75rem var(--spacing-sm);
}

.header__container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  cursor: pointer;
}

.header__logo-img {
  width: 2.5rem;
  height: 2.5rem;
}

.header__title {
  font-size: 1.25rem;
  font-weight: 800;
}

/* ===== Button ===== */
.btn {
  display: inline-block;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 1.125rem;
  font-weight: 500;
  text-align: center;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-full);
  width: 100%;
  transition: background-color var(--transition), transform var(--transition);
}

.btn:hover {
  background-color: #4f4fe6;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

/* ===== Sections ===== */
.section {
  padding: var(--spacing-xl) var(--spacing-sm);
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section--cta {
  background-color: var(--color-bg-main);
}

.section__container {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
}

.section__container--row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.section__container--center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-align: center;
}

.section__content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  width: 100%;
}

.section__media {
  width: 100%;
}

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

.section__label {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.section__title {
  font-size: 2rem;
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-text);
}

.section__text {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--color-text);
}

.section__list {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--color-text);
  list-style-type: disc;
}

.section__list li {
  margin-bottom: var(--spacing-xs);
}

.section__img {
  border-radius: var(--border-radius);
  border: 2px solid var(--color-border);
}

/* ===== Hero Section ===== */
.hero__title {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
}

.hero__subtitle {
  font-size: 2.3rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}

.hero__button {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

/* ===== CTA Section ===== */
.cta__title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-text);
}

.hero__button-text {
  font-size: 1rem;
  color: var(--color-primary);
  font-weight: 500;
}

/* ===== Footer ===== */
.footer {
  background-color: var(--color-bg-alt);
  padding: var(--spacing-lg) var(--spacing-sm);
}

.footer__container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer__info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer__text {
  font-size: 1rem;
  color: var(--color-text);
}

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

.footer__link:hover {
  opacity: 0.8;
}

.footer__copyright {
  font-size: 0.875rem;
  color: var(--color-text);
}

/* ===== Media Queries ===== */

/* Tablet and up (768px) */
@media (min-width: 48rem) {
  .section__container--row {
    flex-direction: row;
    justify-content: space-between;
  }

  .section__container--reverse {
    flex-direction: row-reverse;
  }

  .section__content {
    width: 50%;
  }

  .hero__button {
    align-self: flex-start;
    min-width: 390px;
  }

  .section__media {
    width: 50%;
  }

  .btn {
    max-width: 24rem;
  }
}

/* Desktop and up (1024px) */
@media (min-width: 64rem) {
  .section {
    padding: var(--spacing-2xl) var(--spacing-sm);
  }

  .hero__title {
    font-size: 3rem;
  }

  .hero__subtitle {
    font-size: 2.25rem;
  }

  .cta__title {
    font-size: 2.25rem;
  }
}