:root {
  --color-bg: #ededed;
  --color-header-bg: #150f64;
  --color-bg-secondary: #ffffff;

  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-text-header: #ffffff;

  --color-border: #e5e7eb;

  --radius: 12px;
  --max-width: 1100px;
}

html {
  scroll-behavior: smooth;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

p {
  text-align: justify;
}

header {
  background-color: var(--color-header-bg);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-header);    
  padding: 1.5rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  text-align: center;
  margin-bottom: 1rem;
}

#horizontal_nav_bar {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 2rem;
}

#horizontal_nav_bar a {
  text-decoration: none;
  color: var(--color-text-header);
  font-weight: 500;
  padding: 0.25rem 0;
  position: relative;
}

#horizontal_nav_bar a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background-color: var(--color-text-header);
  transition: width 0.2s ease;
}

#horizontal_nav_bar a:hover::after {
  width: 100%;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
}

section {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2.5rem;
  transition: box-shadow 0.3s ease;
}

section:hover {
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

section h2 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

section hr {
  border: none;
  height: 2px;
  width: 60px;
  background-color: var(--color-text);
  margin-bottom: 1.5rem;
}

#title {
    border: 0px;
    background-color: transparent;
    justify-content: center;
    align-items: center;
    text-align: center;
    font-size: 150%;
    box-shadow: 0px 0px 0px 0px;
    margin-bottom: 2%;
}

#sub_title {
    border: 0px;
    background-color: transparent;
    justify-content: center;
    align-items: center;
    text-align: center;
    font-size: 60%;
    display: flex;
    justify-content: space-between;
    width: 38%;
    justify-self: center;
    margin: 0 auto;
}

.competence {
    margin-top: 2%;
}

.project {
  padding-left: 1%;
  padding-bottom: 1%;
}

.project h4 {
  margin-top: 1%;
  margin-bottom: 1%;
}

.project p {
  padding-left: 1%;
}

.project img {
  margin-top: 1%;
  margin-left: auto;
  margin-right: auto;
  display: block;
  border-radius: var(--radius);
  max-width: 100%;
  height: auto;
}

.link {
    text-decoration: none;
    color: var(--color-header-bg);
    font-weight: 500;
    font-style: italic;
}

/* Accordéon styles */

.accordion {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.accordion-btn {
  width: 100%;
  padding: 1rem;
  background-color: var(--color-header-bg);
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.accordion-btn[aria-expanded="true"] {
  background-color: var(--color-header-bg);
  color: white;
}

.accordion-icon {
  font-size: 1.5rem;
  transition: transform 0.3s ease;
}

.accordion-btn[aria-expanded="true"] .accordion-icon {
  transform: rotate(90deg);
}

.accordion-panel {
  background-color: var(--color-bg-secondary);
  padding: 1%;
  border-top: 1px solid var(--color-border);
  animation: slideDown 0.5s ease;
}