:root {
  --white: #ffffff;
  --gray-light: #f4f2f5;
  --gray: #b2acac;
  --gray-mid: #949494;
  --gray-dark: #827d7d;
  --black: #000000;
  --violet: #988db3;
  --teal: #00a99d;

  --shadow: 0 8px 18px rgba(0, 0, 0, 0.08);
  --shadow-strong: 0 12px 24px rgba(0, 0, 0, 0.12);
  --radius: 16px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: var(--gray-light);
  color: var(--black);
  line-height: 1.5;
}

/* HEADER */

.site-header {
  background: var(--white);
  border-bottom: 4px solid var(--teal);
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition:
    padding 0.25s ease,
    border-bottom-width 0.25s ease,
    box-shadow 0.25s ease;
}

.header-container {
  max-width: 1200px;
  margin: auto;
  display: grid;
  grid-template-columns: auto auto 1fr;
  grid-template-areas:
    "brand liceo title"
    "nav nav nav";
  align-items: center;
  gap: 16px 20px;
}

.brand-link,
.school-link {
  display: inline-flex;
  align-items: center;
}

.main-logo {
  grid-area: brand;
  height: 70px;
  width: auto;
  transition: height 0.25s ease;
}

.school-logo {
  grid-area: liceo;
  height: 62px;
  width: auto;
  opacity: 0.9;
  transition:
    height 0.25s ease,
    opacity 0.25s ease;
}

.title-block {
  grid-area: title;
}

.title-block h1 {
  font-size: 2rem;
  letter-spacing: 1px;
  transition: font-size 0.25s ease;
}

.title-block p {
  color: var(--gray-dark);
  font-size: 1rem;
}

/* NAV */

.main-nav {
  grid-area: nav;
  background: var(--black);
  display: flex;
  gap: 20px;
  padding: 14px 20px;
  flex-wrap: wrap;
  margin: 0 -20px -20px;
  transition:
    background 0.25s ease,
    padding 0.25s ease,
    margin 0.25s ease;
}

.main-nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: bold;
  transition: 0.2s;
}

.main-nav a:hover {
  color: var(--teal);
}

/* HEADER COMPACTO */

.site-header.compact {
  padding: 8px 20px;
  border-bottom-width: 3px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

.site-header.compact .header-container {
  grid-template-columns: auto auto 1fr;
  grid-template-areas: "brand liceo nav";
}

.site-header.compact .main-logo {
  height: 42px;
}

.site-header.compact .school-logo {
  height: 38px;
  opacity: 0.75;
}

.site-header.compact .title-block {
  display: none;
}

.site-header.compact .main-nav {
  margin: 0;
  padding: 0;
  background: transparent;
  justify-content: flex-end;
  align-items: center;
  transition: none;
}

.site-header.compact .main-nav a {
  color: var(--black);
}

.site-header.compact .main-nav a:hover {
  color: var(--teal);
}

/* MAIN */

main {
  max-width: 1200px;
  margin: auto;
  padding: 40px 20px;
}

.hero {
  background: linear-gradient(135deg, var(--violet), var(--teal));
  color: white;
  padding: 40px;
  border-radius: 18px;
  margin-bottom: 40px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.hero h2 {
  font-size: 2rem;
  margin-bottom: 10px;
}

.hero p {
  max-width: 760px;
  font-size: 1.1rem;
}

.section-title {
  margin-bottom: 20px;
  font-size: 1.5rem;
  border-left: 6px solid var(--teal);
  padding-left: 12px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 50px;
}

/* CARDS */

.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
  border-top: 5px solid var(--violet);
}

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

.card h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.card p {
  color: var(--gray-dark);
  margin-bottom: 18px;
}

.card-algoritmos {
  border-top-color: var(--teal);
  background: linear-gradient(180deg, #ffffff 0%, rgba(0, 169, 157, 0.08) 100%);
}

.card-programacion {
  border-top-color: var(--violet);
  background: linear-gradient(180deg, #ffffff 0%, rgba(152, 141, 179, 0.14) 100%);
}

.card-robotica {
  border-top-color: var(--gray-dark);
  background: linear-gradient(180deg, #ffffff 0%, rgba(130, 125, 125, 0.12) 100%);
}

/* BOTONES */

.btn,
button {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
  background: var(--teal);
  color: white;
  border: none;
  cursor: pointer;
  transition: 0.2s;
  font-size: 1rem;
}

.btn:hover,
button:hover {
  background: var(--black);
}

button:disabled,
.btn-disabled {
  background: var(--gray);
  cursor: not-allowed;
  opacity: 0.75;
}

button:disabled:hover,
.btn-disabled:hover {
  background: var(--gray);
}

/* FORMULARIOS */

.form-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border-top: 5px solid var(--teal);
  margin-bottom: 30px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

label {
  font-weight: bold;
}

input,
select {
  width: 100%;
  padding: 11px 12px;
  border: 2px solid var(--gray);
  border-radius: 10px;
  font-size: 1rem;
  background: var(--white);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--teal);
}

/* FOOTER */

footer {
  background: var(--black);
  color: white;
  text-align: center;
  padding: 30px 20px;
  margin-top: 50px;
}

footer small {
  color: #cccccc;
}

/* RESPONSIVE */

@media (max-width: 760px) {
  .site-header {
    padding: 16px;
  }

  .header-container {
    grid-template-columns: auto auto;
    grid-template-areas:
      "brand liceo"
      "title title"
      "nav nav";
    align-items: center;
  }

  .main-logo {
    height: 54px;
  }

  .school-logo {
    height: 48px;
  }

  .title-block h1 {
    font-size: 1.5rem;
  }

  .main-nav {
    flex-direction: column;
    gap: 12px;
    width: calc(100% + 32px);
    margin: 0 -16px -16px;
    padding: 14px 16px;
  }

  .site-header.compact {
    padding: 10px 16px;
  }

  .site-header.compact .header-container {
    grid-template-columns: auto auto 1fr;
    grid-template-areas: "brand liceo nav";
  }

  .site-header.compact .main-logo {
    height: 36px;
  }

  .site-header.compact .school-logo {
    height: 34px;
  }

  .site-header.compact .main-nav {
    flex-direction: row;
    justify-content: flex-end;
    gap: 10px;
    width: auto;
    margin: 0;
    padding: 0;
    font-size: 0.85rem;
  }

  .hero {
    padding: 28px;
  }

  .hero h2 {
    font-size: 1.55rem;
  }
}