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

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

html {
  scroll-behavior: smooth;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

body {
  overflow-x: hidden;
}

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;
}

#home img {
  max-width: 700px;
  max-height: 700px;
  margin-right: 3rem;
}

#home {
  margin-left: 3rem;
  padding: 90px 0;
  font-size: 18pt;
}

.home-wrapper h3 {
  color: var(--blue-mid);
}

.home-detail {
  color: var(--blue-dark);
}

.left-section-home {
  max-width: 700px;
}

.home-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  margin: 1rem;
}

#home h3,
#home p,
#home a {
  margin-bottom: 1rem;
}

.formule-btn,
.lessons-btn {
  display: inline-block;
  margin: 1rem;
}

.call-to-action-btns {
  margin-top: 2rem;
}

.formule-btn a {
  background-color: var(--blue-main);
  text-decoration: none;
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  transition: all ease 0.3s;
}
.formule-btn a:hover {
  background-color: var(--blue-dark);
}

.lessons-btn a {
  border: 2px solid var(--blue-main);
  text-decoration: none;
  color: #000;
  padding: 10px 20px;
  border-radius: 10px;
  transition: all ease 0.3s;
}

.lessons-btn a:hover {
  background-color: var(--blue-main);
  color: #fff;
}

@media screen and (max-width: 1200px) {
  .card-1,
  .card-2,
  .card-3,
  .card-4,
  .card-5,
  .card-6,
  .card-7,
  .card-8,
  .card-9 {
    margin: 0.5rem auto; /* auto centrează orizontal */
    width: 90% !important;
  }
  .cards {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 2rem 0;
    width: 100%;
    height: auto;
  }

  .card-1 img,
  .card-2 img,
  .card-3 img,
  .card-4 img,
  .card-5 img,
  .card-6 img,
  .card-7 img,
  .card-8 img,
  .card-9 img {
    max-width: 100% !important;
    max-height: 100% !important;
  }
}

@media screen and (max-width: 1500px) {
  .right-section img {
    width: 300px;
    height: 300px;
  }

  #home {
    margin-left: 0px;
    margin-right: 0px;
    width: 100%;
    height: auto;
    margin: 0 !important;
  }
  #home img {
    margin-right: 0;
  }

  .home-wrapper {
    flex-direction: column;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 4rem 2rem;
    margin: 0 !important;
    width: 100%;
    height: auto !important;
  }

  .right-section {
    order: -1; /* mută imaginea prima */
  }
}

/* Lectii Section */

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

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

.cards {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.cards-2 {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.card-1 img,
.card-2 img,
.card-3 img,
.card-4 img,
.card-5 img,
.card-6 img,
.card-7 img,
.card-8 img,
.card-9 img {
  width: 300px;
  height: 300px;
  object-fit: cover;
}

.card-1 p,
.card-2 p,
.card-3 p,
.card-4 p,
.card-5 p,
.card-6 p,
.card-7 p,
.card-8 p,
.card-9 p {
  margin-top: 1rem;
}

.card-1,
.card-2,
.card-3,
.card-4,
.card-5,
.card-6,
.card-7,
.card-8,
.card-9 {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  flex-direction: column;
  border-radius: 10px;
  padding: 30px;
  margin: 1rem;
  border: 2px solid var(--blue-main);
  transition: all ease 0.3s;
  flex-shrink: 0;
  width: 100%;
  max-width: 350px;
  height: 480px;
  position: relative;
}

.card-1:hover,
.card-2:hover,
.card-3:hover,
.card-4:hover,
.card-5:hover,
.card-6:hover,
.card-7:hover,
.card-8:hover,
.card-9:hover {
  box-shadow: 0 8px 8px var(--blue-main);
  transform: translateY(-5px);
}

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

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

.view-btn {
  position: absolute;
  text-decoration: none;
  bottom: 15px;
  background-color: var(--blue-main);
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  transition: all ease 0.3s;
}

.view-btn:hover {
  background-color: var(--blue-dark);
}

/* Formule Section */

.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;
  }
}

/* Footer */

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 {
  order: -1;
}

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

.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);
}