* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", sans-serif;
}

nav {
  display: flex;
  align-items: center; /* aliniere verticală centru */
  justify-content: space-between; /* logo în stânga, link-uri în dreapta */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 50;
  padding: 6px;
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(15, 61, 140, 0.1);
}

.nav-links ul,
.nav-links li {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.nav-links a {
  text-decoration: none;
  margin: 1rem;
  color: #00171f;
}

.nav-links {
  margin-right: 2rem;
}

.nav-links li .blob {
  position: absolute;
  bottom: 7px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 100%;
  height: 32px;
  z-index: 0;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
}

/* apare la hover si pe linkul activ */
.nav-links li:hover .blob,
.nav-links li.active .blob {
  transform: translateX(-50%) scaleX(1);
}

.logo a {
  text-decoration: none;
  color: var(--blue-mid);
  font-weight: 600;
  margin-left: 2rem;
}

:root {
  --blue-dark: #0d2857; /* hero background */
  --blue-mid: #0f3d8c; /* navbar */
  --blue-main: #1a5eb8; /* butoane */
  --blue-pale: #e8f1fb; /* secțiuni deschise */
  --accent: #f5a623; /* highlight, iconițe */
}

.lessons {
  padding: 180px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

span {
  color: #dc143c;
}

.lessons > div {
  max-width: 800px;
  padding: 0 20px;
}

@media screen and (max-width: 700px) {
  .lessons > div {
    max-width: 400px;
    padding: 0 1rem;
  }
}

.lessons > div p {
  font-weight: 500;
}

.lessons > div h1 {
  color: var(--blue-main);
}

.lessons > div h1,
div p,
div h3 {
  margin-bottom: 2rem;
}

.corpuri-rotunde-p {
  margin-left: 9.5rem;
}

footer {
  background-color: var(--blue-dark);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}
footer > div {
  text-align: center;
}

.copyright-legal,
.media-links {
  display: inline-block;

  margin: 2rem;
}

.copyright-legal a {
  text-decoration: none;
  color: var(--blue-main);
}

.media-links a {
  text-decoration: none;
  color: #fff;
  background-color: var(--blue-main);
  border: 1px solid var(--blue-main);
  border-radius: 50px;
  padding: 8px 8px;
  font-size: 13pt;
  margin: 0.5rem;
  display: inline-block;
  transition: ease 0.3s;
}
.media-links a:hover {
  background-color: var(--blue-dark);
}

.copyright-legal {
  order: -1;
}

@media screen and (max-width: 700px) {
  .copyright-legal {
    order: 1;
  }
}

/* Formulas */

.formulas-section {
  padding: 120px 0;
}

.formulas-title {
  text-align: center;
  color: var(--blue-main);
  font-size: 21pt;
  margin-bottom: 4rem;
}

.formulas-section {
  padding: 120px 0;
}

.formulas-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: 24px;
  margin: 0 2rem;
}

.formulas-wrapper > div {
  border: 1.5px solid var(--blue-main);
  border-radius: 10px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 12px rgba(26, 94, 184, 0.12);
}

.formulas-wrapper > div h3 {
  color: var(--blue-mid);
  margin-bottom: 8px;
  text-align: center;
}

.formulas-wrapper > div img {
  width: 160px;
  height: 160px;
  margin-bottom: 8px;
}

.formulas-wrapper > div p {
  font-size: 15px;
  text-align: center;
}

@media screen and (max-width: 700px) {
  .formulas-wrapper {
    grid-template-columns: 1fr;
    margin: 0 1rem;
  }
  #home {
    font-size: 14pt;
  }
}