:root {
  /* Fonts */
  --font-heading: "Montserrat", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body:    "Nunito",     system-ui, -apple-system, BlinkMacSystemFont, sans-serif;

  /* --- Palette --- */

  /* Page background & content cards */
  --color-bg-body:    #fafafa;
  --color-bg-content: #ffffff;

  /* Text */
  --color-text-primary: #333333;
  --color-text-heading: #444444;

  /* Borders */
  --color-border:       #dddddd;
  --color-border-light: #e3e3e3;

  /* Navigation bar */
  --color-nav-bg:         #527c9f;
  --color-nav-link:       #cbd5db;
  --color-nav-link-hover: #ffffff;


  /* Primary (steel blue) — used for navbar, btn-primary, btn-outline-primary */
  --color-primary:        #527c9f;
  --color-primary-hover:  #466187;
  --color-primary-active: #3f6179;
  --color-primary-border: #3a5b72;

  /* Danger (muted red) — used for btn-danger, btn-outline-danger, modal header */
  --color-danger:        #a85b5b;
  --color-danger-hover:  #924e4e;
  --color-danger-active: #874848;
  --color-danger-border: #7c4242;

  /* Success (muted green) — modal header only */
  --color-success-modal: #4a7c5d;

  /* Secondary (neutral grey) — btn-outline-secondary */
  --color-secondary-text:          #495057;
  --color-secondary-border:        #6c757d;
  --color-secondary-hover:         #5a6268;
  --color-secondary-active:        #545b62;
  --color-secondary-active-border: #4e555b;

  /* Focus ring */
  --color-focus: #428bca;

  /* Spacing */
  --spacing-xl: 5rem;

  /* Sizing */
  --article-img-size: 4rem;
  --account-img-size: 7.813rem;
}

/* Dark mode palette overrides */
[data-bs-theme="dark"] {
  --color-bg-body:    #1a1a1a;
  --color-bg-content: #2d2d2d;
  --color-text-primary: #e0e0e0;
  --color-text-heading: #f0f0f0;
  --color-border:       #404040;
  --color-border-light: #4a4a4a;

  /* Primary — lighter tint for dark backgrounds */
  --color-primary:        #8aadc8;
  --color-primary-hover:  #9fbdd4;
  --color-primary-active: #b4cde0;
  --color-primary-border: #b4cde0;

  /* Danger — lighter tint for dark backgrounds */
  --color-danger:        #d89090;
  --color-danger-hover:  #e0a8a8;
  --color-danger-active: #e8bcbc;
  --color-danger-border: #e8bcbc;

  /* Secondary — lighter tint for dark backgrounds */
  --color-secondary-text:          #b8bfc6;
  --color-secondary-border:        #8a939b;
  --color-secondary-hover:         #adb5bd;
  --color-secondary-active:        #a2aab2;
  --color-secondary-active-border: #a2aab2;
}


/* =====================
   Base Styles
   ===================== */

body {
  font-family: var(--font-body);
  background: var(--color-bg-body);
  color: var(--color-text-primary);
}

main {
  padding-top: var(--spacing-xl);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text-heading);
}

.navbar-brand {
  font-family: var(--font-heading);
}

a {
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}


/* =====================
   Navigation
   ===================== */

.bg-steel {
  background-color: var(--color-nav-bg);
}

.site-header .navbar-nav .nav-link {
  color: var(--color-nav-link);
  transition: color 0.2s ease-in-out;
}

.site-header .navbar-nav .nav-link:hover,
.site-header .navbar-nav .nav-link:focus {
  color: var(--color-nav-link-hover);
}

.site-header .navbar-nav .nav-link.active {
  font-weight: 600;
}


/* =====================
   Content Sections
   ===================== */

.content-section {
  background: var(--color-bg-content);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.05);
  transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}

.content-section:hover {
  box-shadow: 0 4px 10px rgba(15, 23, 42, 0.1);
  border-color: var(--color-border-light);
}

[data-bs-theme="dark"] .content-section {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

[data-bs-theme="dark"] article.content-section:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}


/* =====================
   Articles
   ===================== */

.article-title {
  color: var(--color-text-heading);
  transition: color 0.2s ease-in-out;
}

a.article-title:hover,
a.article-title:focus {
  color: var(--color-focus);
  text-decoration: none;
}

.article-content {
  white-space: pre-line;
  font-size: 1.25rem;
}

.article-img {
  height: var(--article-img-size);
  width: var(--article-img-size);
  flex-shrink: 0;
  object-fit: cover;
  border: 1px solid var(--color-border-light);
  box-shadow: 0 0 0 2px var(--color-bg-content);
}

.article-metadata {
  padding-bottom: 0.063rem;
  border-bottom: 1px solid var(--color-border-light);
}

.article-metadata a {
  transition: color 0.2s ease-in-out;
}

.article-metadata a:hover,
.article-metadata a:focus {
  color: var(--color-text-primary);
  text-decoration: none;
}

.article-svg {
  width: 1.563rem;
  height: 1.563rem;
  vertical-align: middle;
}


/* =====================
   Account / Profile
   ===================== */

.account-img {
  height: var(--account-img-size);
  width: var(--account-img-size);
  object-fit: cover;
}

.account-heading {
  font-size: 2.5rem;
}

.file-input-sm {
  max-width: 300px;
}


/* =====================
   Buttons — Light Mode
   ===================== */

.btn-primary {
  --bs-btn-color:               #fff;
  --bs-btn-bg:                  var(--color-primary);
  --bs-btn-border-color:        var(--color-primary);
  --bs-btn-hover-color:         #fff;
  --bs-btn-hover-bg:            var(--color-primary-hover);
  --bs-btn-hover-border-color:  var(--color-primary-active);
  --bs-btn-active-color:        #fff;
  --bs-btn-active-bg:           var(--color-primary-active);
  --bs-btn-active-border-color: var(--color-primary-border);
}

.btn-outline-primary {
  --bs-btn-color:               var(--color-primary);
  --bs-btn-border-color:        var(--color-primary);
  --bs-btn-hover-color:         #fff;
  --bs-btn-hover-bg:            var(--color-primary-hover);
  --bs-btn-hover-border-color:  var(--color-primary-active);
  --bs-btn-active-color:        #fff;
  --bs-btn-active-bg:           var(--color-primary-active);
  --bs-btn-active-border-color: var(--color-primary-border);
}

.btn-danger {
  --bs-btn-color:               #fff;
  --bs-btn-bg:                  var(--color-danger);
  --bs-btn-border-color:        var(--color-danger);
  --bs-btn-hover-color:         #fff;
  --bs-btn-hover-bg:            var(--color-danger-hover);
  --bs-btn-hover-border-color:  var(--color-danger-active);
  --bs-btn-active-color:        #fff;
  --bs-btn-active-bg:           var(--color-danger-active);
  --bs-btn-active-border-color: var(--color-danger-border);
}

.btn-outline-danger {
  --bs-btn-color:               var(--color-danger);
  --bs-btn-border-color:        var(--color-danger);
  --bs-btn-hover-color:         #fff;
  --bs-btn-hover-bg:            var(--color-danger-hover);
  --bs-btn-hover-border-color:  var(--color-danger-active);
  --bs-btn-active-color:        #fff;
  --bs-btn-active-bg:           var(--color-danger-active);
  --bs-btn-active-border-color: var(--color-danger-border);
}

.btn-outline-secondary {
  --bs-btn-color:               var(--color-secondary-text);
  --bs-btn-border-color:        var(--color-secondary-border);
  --bs-btn-hover-color:         #fff;
  --bs-btn-hover-bg:            var(--color-secondary-hover);
  --bs-btn-hover-border-color:  var(--color-secondary-active);
  --bs-btn-active-color:        #fff;
  --bs-btn-active-bg:           var(--color-secondary-active);
  --bs-btn-active-border-color: var(--color-secondary-active-border);
}


/* =====================
   Buttons — Dark Mode
   ===================== */

[data-bs-theme="dark"] .btn-outline-primary {
  --bs-btn-color:               var(--color-primary);
  --bs-btn-border-color:        var(--color-primary);
  --bs-btn-hover-color:         #000;
  --bs-btn-hover-bg:            var(--color-primary);
  --bs-btn-hover-border-color:  var(--color-primary-hover);
  --bs-btn-active-color:        #000;
  --bs-btn-active-bg:           var(--color-primary-hover);
  --bs-btn-active-border-color: var(--color-primary-active);
}

[data-bs-theme="dark"] .btn-outline-secondary {
  --bs-btn-color:               var(--color-secondary-text);
  --bs-btn-border-color:        var(--color-secondary-border);
  --bs-btn-hover-color:         #000;
  --bs-btn-hover-bg:            var(--color-secondary-text);
  --bs-btn-hover-border-color:  var(--color-secondary-hover);
  --bs-btn-active-color:        #000;
  --bs-btn-active-bg:           var(--color-secondary-hover);
  --bs-btn-active-border-color: var(--color-secondary-active);
}

[data-bs-theme="dark"] .btn-outline-danger {
  --bs-btn-color:               var(--color-danger);
  --bs-btn-border-color:        var(--color-danger);
  --bs-btn-hover-color:         #000;
  --bs-btn-hover-bg:            var(--color-danger);
  --bs-btn-hover-border-color:  var(--color-danger-hover);
  --bs-btn-active-color:        #000;
  --bs-btn-active-bg:           var(--color-danger-hover);
  --bs-btn-active-border-color: var(--color-danger-active);
}


/* =====================
   Modals
   ===================== */

.modal-header.bg-success {
  background-color: var(--color-success-modal) !important;
}

.modal-header.bg-danger {
  background-color: var(--color-danger) !important;
}

.modal-header.bg-success .modal-title,
.modal-header.bg-danger .modal-title {
  color: #ffffff !important;
}


/* =====================
   Responsive
   ===================== */

@media (max-width: 768px) {
  .account-heading {
    font-size: 2rem;
  }

  .article-img {
    height: 3rem;
    width: 3rem;
  }
}