/* ----------------------------------------
   Layout Containers
---------------------------------------- */
section,
article {
  margin: 0;
  padding: 0;
}

.container {
  max-width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-lg) 0;
}

.container-full {
  max-width: 100vw;
  width: 100vw;
  margin-left: 0;
  margin-right: 0;
  padding-left: 0;
  padding-right: 0;
}

.container-full img {
  width: 100%;
  max-height: 300px;
  height: auto;
  object-fit: cover;
  display: block;
}

.container article + article {
  margin-top: var(--space-2xl);
}

/* Dark mode toggle vertically centered */
.dark-mode-container {
  display: flex;
  align-items: center;
}

/* ----------------------------------------
   Navigation Layout
---------------------------------------- */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
}

nav h1 {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
  line-height: 1;
}

nav ul {
  display: flex;
  flex-direction: column;
  list-style: none;
  gap: var(--space-lg);
  padding-left: 0; /* Some browsers add 'padding-left' to 'ul' by default */
  margin: 0; /* Reset default ul margin */
}

.nav-menu-list {
  /* Make nav-menu-list (ul) horizontal and spacing */
  display: flex;
  gap: var(--space-lg);
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ----------------------------------------
   Hero Section
---------------------------------------- */
#hero {
  margin: var(--space-3xl) 0 var(--space-3xl);
}

#project-hero {
  margin: 0 0 var(--space-2xl);
}

/* ----------------------------------------
   Projects Section
---------------------------------------- */
/* Home Page */
#projects {
  padding: var(--space-3xl) 0;
}

.projects-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg); /* Spacing between project cards */
  margin-top: var(--space-xl);
}

/* ----------------------------------------
   Projects Details Section
---------------------------------------- */
.project-heading {
  margin-top: var(--space-2xl);
}

.project-columns {
  display: flex;
  flex-direction: column; /* stack on mobile */
  gap: 1.5rem; /* vertical spacing */
}

.project-columns .column.role,
.project-columns .column.skills,
.project-columns .column.timeline {
  width: 100%; /* full width on mobile */
}

/* optional for testing */
/* .project-columns > div {
  background-color: var(--color-grey); 
} */

.project-columns .column h3 {
  font-size: var(--fs-h6);
  font-weight: var(--fw-regular);
  margin-bottom: var(--space-sm);
}

.project-columns .column ul {
  list-style: none;
  padding: 0;
  margin: 0;
  line-height: 1.6;
}

#project-body {
  margin: var(--space-2xl) 0 var(--space-2xl);
}

/* ----------------------------------------
   Line divider between sections
---------------------------------------- */
.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  width: 100%;
  max-width: 1100px;
}

/* ----------------------------------------
   Site Title
---------------------------------------- */
.site-title {
  display: flex;
  align-items: center;
  line-height: 1;
  margin: 0;
  padding: 0;

  position: relative;
  z-index: 9999;
  color: var(--color-primary);
  font-size: var(--fs-h4);
  font-weight: var(--fw-bold);
  text-decoration: none;
}

.site-title:hover {
  color: var(--color-primary);
  text-decoration: none;
  outline: none;
}

/* ----------------------------------------
   Mobile Fallback (max-width: 599px)
---------------------------------------- */
@media (max-width: 599px) {
  /* Navigation Layout */
  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .nav-menu-list {
    flex-direction: column;
    gap: var(--space-md);
  }
}

/* ----------------------------------------
   Mobile + Tablet (< 900px)
---------------------------------------- */
@media screen and (max-width: 899px) {
  /* Navigation Layout */
  nav {
    justify-content: space-between;
  }
}

/* ----------------------------------------
   Tablet (min-width: 768px)
---------------------------------------- */
@media screen and (min-width: 768px) {
  /* Navigation Layout */
  nav {
    flex-direction: row;
  }

  nav a {
    display: inline-block;
    width: auto;
  }

  nav ul {
    flex-direction: row;
  }

  /* Hero Section */
  #hero {
    margin: var(--space-5xl) 0 var(--space-4xl);
  }

  /* Projects Details Section */
  .project-columns {
    display: inline-flex; /* shrink-wrap content */
    flex-direction: row; /* side-by-side */
    gap: 2rem; /* horizontal spacing */
  }
  .project-columns .column.role {
    flex: 1 1 0;
    min-width: 0;
  }
  .project-columns .column.skills,
  .project-columns .column.timeline {
    flex: 0 0 auto;
    width: max-content;
  }
}

/* ----------------------------------------
   Desktop Styles (min-width: 1024px)
---------------------------------------- */
@media screen and (min-width: 1024px) {
  /* Hero Section */
  #project-hero {
    margin: 0 0 var(--space-3xl);
  }

  /* Layout Containers */
  .container-sm {
    max-width: 800px;
  }

  .container-md {
    max-width: 1100px;
  }

  .container-full img {
    max-height: 600px;
  }

  /* Navigation Layout */
  .nav-links {
    display: flex;
    flex-direction: row;
  }

  .nav-links li {
    width: auto;
    text-align: left;
  }

  /* Projects Details Section */
  .project-heading {
    margin-top: var(--space-3xl);
  }
}