/* ==========================================================================
   razvanm.ro — Static Site Stylesheet
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  --color-primary: #2872fa;
  --color-primary-dark: #1559ed;
  --color-slate: #3a4f66;
  --color-navy: #192a3d;
  --color-gray-light: #e1e8ed;
  --color-gray-soft: #f2f5f7;
  --color-off-white: #fafbfc;
  --color-white: #ffffff;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --font-size-base: 1rem;
  --line-height-base: 1.65;

  --container-max: 1290px;
  --container-narrow: 760px;
  --header-height: 80px;
  --header-height-mobile: 60px;

  --radius: 6px;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-navy);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

ul,
ol {
  padding-left: 1.5em;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-navy);
}

h1 { font-size: 2.25rem; margin-bottom: 1rem; }
h2 { font-size: 1.75rem; margin-top: 2rem; margin-bottom: 0.75rem; }
h3 { font-size: 1.375rem; margin-top: 1.5rem; margin-bottom: 0.5rem; }
h4 { font-size: 1.125rem; margin-top: 1.25rem; margin-bottom: 0.5rem; }

p {
  margin-bottom: 1rem;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Header ---------- */
.site-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-gray-light);
  background: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  color: var(--color-slate);
  font-size: 0.938rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-navy);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
  display: block;
}

/* ---------- Page Header ---------- */
.page-header {
  padding: 3rem 0 2rem;
  text-align: center;
}

.page-header h1 {
  margin-bottom: 0.5rem;
}

.page-header .subtitle {
  color: var(--color-slate);
  font-size: 1.125rem;
}

/* ---------- Card Grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: 2rem 0 4rem;
}

.home-page .card-grid {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--card-shadow-hover);
}

.card a {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.card:hover .card-image img {
  transform: scale(1.03);
}

.card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.813rem;
  color: var(--color-slate);
  margin-bottom: 0.5rem;
}

.card-category {
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-navy);
  margin-bottom: 0.5rem;
}

.card-excerpt {
  font-size: 0.875rem;
  color: var(--color-slate);
  line-height: 1.6;
  flex: 1;
}

.card-read-more {
  font-size: 0.813rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 1rem;
}

/* ---------- Article ---------- */
.article-header {
  padding: 3rem 0 1.5rem;
}

.article-header .article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--color-slate);
  margin-bottom: 1rem;
}

.article-header .article-meta .category {
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
}

.article-header h1 {
  font-size: 2.25rem;
  line-height: 1.2;
}

.article-hero {
  margin: 0 auto 2rem;
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  justify-content: center;
}

.article-hero img {
  width: 100%;
  margin: 0 auto;
  display: block;
  border-radius: var(--radius);
}

.article-content {
  padding-bottom: 4rem;
}

.article-content h2 {
  margin-top: 2.5rem;
}

.article-content h3 {
  margin-top: 2rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.25rem;
}

.article-content li {
  margin-bottom: 0.35rem;
}

.article-content a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content img {
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

.article-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--color-gray-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-slate);
  font-style: italic;
}

/* Code blocks */
.article-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-gray-soft);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.article-content pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.5rem 0;
  line-height: 1.5;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.875rem;
}

/* ---------- About / Static Pages ---------- */
.page-content {
  padding: 1rem 0 4rem;
}

.page-content p {
  margin-bottom: 1.25rem;
}

/* ---------- Contact ---------- */
.contact-links {
  list-style: none;
  padding: 0;
  margin-top: 1.5rem;
}

.contact-links li {
  margin-bottom: 1rem;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--color-gray-light);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.contact-links a:hover {
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(40, 114, 250, 0.15);
}

/* ---------- Category Filters ---------- */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  justify-content: center;
}

.category-filters button {
  font-family: var(--font-family);
  font-size: 0.813rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-gray-light);
  border-radius: 999px;
  background: var(--color-white);
  color: var(--color-slate);
  cursor: pointer;
  transition: all var(--transition);
}

.category-filters button:hover,
.category-filters button.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-gray-light);
  padding: 2rem 0;
  text-align: center;
  color: var(--color-slate);
  font-size: 0.875rem;
}

/* ---------- 404 ---------- */
.error-page {
  text-align: center;
  padding: 6rem 0;
}

.error-page h1 {
  font-size: 5rem;
  color: var(--color-gray-light);
  margin-bottom: 0.5rem;
}

.error-page p {
  font-size: 1.125rem;
  color: var(--color-slate);
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.938rem;
  transition: background var(--transition);
}

.btn:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
}

/* ---------- Utilities ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 999.98px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  h1 { font-size: 1.875rem; }
  h2 { font-size: 1.5rem; }

  .article-header h1 {
    font-size: 1.875rem;
  }
}

@media (max-width: 689.98px) {
  :root {
    --header-height: var(--header-height-mobile);
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height-mobile);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 1rem 1.5rem 1.5rem;
    gap: 0;
    border-bottom: 1px solid var(--color-gray-light);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.75rem 0;
    font-size: 1rem;
    border-bottom: none;
  }

  .nav-toggle {
    display: block;
  }

  h1 { font-size: 1.625rem; }

  .article-header h1 {
    font-size: 1.625rem;
  }

  .page-header {
    padding: 2rem 0 1.5rem;
  }

  .container,
  .container--narrow {
    padding: 0 1rem;
  }
}