/* ============================================================
   Osoncorp – Main Stylesheet
   Inter font + FontAwesome icons + Responsive
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

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

:root {
  --color-bg:         #f8f9fc;
  --color-surface:    #ffffff;
  --color-border:     #e2e8f0;
  --color-primary:    #2563eb;
  --color-primary-dk: #1d4ed8;
  --color-secondary:  #64748b;
  --color-text:       #1e293b;
  --color-text-muted: #64748b;
  --color-accent:     #f59e0b;
  --color-success:    #10b981;
  --radius-sm:        6px;
  --radius-md:        12px;
  --radius-lg:        20px;
  --shadow-sm:        0 1px 3px rgba(0,0,0,.08);
  --shadow-md:        0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:        0 8px 32px rgba(0,0,0,.12);
  --transition:       0.2s ease;
  --font:             'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --nav-height:       64px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -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-dk); }

/* ─── Typography ─── */
h1,h2,h3,h4,h5,h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}
h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.875rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.375rem); }

p { margin-bottom: .75rem; }

/* ─── Container ─── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ─── Navbar ─── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.navbar__brand {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: .45rem;
  flex-shrink: 0;
}
.navbar__brand:hover { color: var(--color-primary-dk); }

.navbar__nav {
  display: flex;
  align-items: center;
  gap: .25rem;
  list-style: none;
}

.navbar__nav a {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem .75rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: .9rem;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}
.navbar__nav a:hover,
.navbar__nav a.active {
  background: #eff6ff;
  color: var(--color-primary);
}

/* Mobile nav toggle */
.navbar__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  font-size: 1.4rem;
  padding: .35rem;
  border-radius: var(--radius-sm);
}
.navbar__toggle:hover { background: var(--color-bg); }

/* Mobile menu */
.navbar__menu {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: flex-end;
}

@media (max-width: 768px) {
  .navbar__toggle { display: flex; align-items: center; justify-content: center; }

  .navbar__menu {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: .75rem 1rem;
    box-shadow: var(--shadow-md);
  }
  .navbar__menu.open { display: flex; }

  .navbar__nav {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: .1rem;
  }
  .navbar__nav li { width: 100%; }
  .navbar__nav a { width: 100%; padding: .6rem .75rem; }
}

/* ─── Hero / Page Headers ─── */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  color: #fff;
  padding: 3rem 0 2.5rem;
  text-align: center;
}
.page-hero h1 { color: #fff; margin-bottom: .5rem; }
.page-hero p  { color: rgba(255,255,255,.8); font-size: 1.05rem; }

/* ─── Post Feed (Home) ─── */
.posts-feed {
  padding: 2.5rem 0;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* ─── Post Card ─── */
.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.post-card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--color-bg);
  flex-shrink: 0;
}
.post-card__image-placeholder {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 2.5rem;
  flex-shrink: 0;
}

.post-card__body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-card__category {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--color-primary);
  background: #eff6ff;
  border-radius: 100px;
  padding: .2rem .65rem;
  margin-bottom: .75rem;
}

.post-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: .5rem;
  line-height: 1.35;
}
.post-card__title a { color: var(--color-text); }
.post-card__title a:hover { color: var(--color-primary); }

.post-card__excerpt {
  color: var(--color-text-muted);
  font-size: .875rem;
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__footer {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding-top: .75rem;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.post-card__author {
  display: flex;
  align-items: center;
  gap: .45rem;
  font-size: .8rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.post-card__author-photo {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  flex-shrink: 0;
}
.post-card__author-initials {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: .65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.post-card__date {
  font-size: .78rem;
  color: var(--color-text-muted);
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: .25rem;
}

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--color-text-muted);
}
.empty-state i { font-size: 3rem; margin-bottom: 1rem; display: block; }

/* ─── Post Detail ─── */
.post-detail {
  max-width: 780px;
  margin: 0 auto;
  padding: 2.5rem 1rem;
}

.post-detail__cover {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 2rem;
}

.post-detail__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem 1.25rem;
  margin-bottom: 1.25rem;
  font-size: .875rem;
  color: var(--color-text-muted);
}
.post-detail__meta span {
  display: flex;
  align-items: center;
  gap: .3rem;
}

.post-detail__title {
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  margin-bottom: 1.5rem;
}

.post-detail__content {
  font-size: 1rem;
  line-height: 1.8;
}
.post-detail__content img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin: 1rem 0;
}
.post-detail__content h1,
.post-detail__content h2,
.post-detail__content h3 { margin: 1.5rem 0 .75rem; }
.post-detail__content p  { margin-bottom: 1rem; }
.post-detail__content ul,
.post-detail__content ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.post-detail__content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: .75rem 1.25rem;
  background: #eff6ff;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1rem 0;
  color: var(--color-secondary);
}
.post-detail__content pre,
.post-detail__content code {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  padding: .2rem .4rem;
  font-family: 'Fira Code', 'Courier New', monospace;
}
.post-detail__content pre code { padding: 0; }
.post-detail__content pre { padding: 1rem 1.25rem; overflow-x: auto; }

/* ─── Categories Page ─── */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  padding: 2.5rem 0;
}

.category-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.category-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.category-card__icon {
  font-size: 1.75rem;
  color: var(--color-primary);
  margin-bottom: .5rem;
}
.category-card__name {
  font-size: 1.1rem;
  font-weight: 700;
}
.category-card__desc {
  font-size: .875rem;
  color: var(--color-text-muted);
}
.category-card__count {
  font-size: .8rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: auto;
}

/* ─── Author Card ─── */
.author-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 2.5rem;
}
.author-card__photo {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid var(--color-border);
}
.author-card__initials {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.author-card__info h4 { margin-bottom: .25rem; }
.author-card__info p  { color: var(--color-text-muted); font-size: .875rem; margin: 0; }

/* ─── Breadcrumb ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .83rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb__sep { font-size: .7rem; }

/* ─── Badges ─── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .2rem .65rem;
  border-radius: 100px;
  font-size: .75rem;
  font-weight: 600;
}
.badge--primary  { background: #eff6ff; color: var(--color-primary); }
.badge--category { background: #f0fdf4; color: #16a34a; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .9rem;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
}
.btn:active { transform: scale(.98); }
.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover { background: var(--color-primary-dk); color: #fff; }
.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn--outline:hover { background: #eff6ff; }

/* ─── Footer ─── */
.footer {
  background: #1e293b;
  color: #94a3b8;
  padding: 2.5rem 0;
  margin-top: 4rem;
  font-size: .875rem;
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: space-between;
}
.footer__brand {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: .4rem;
}
.footer__links {
  display: flex;
  gap: 1.25rem;
}
.footer__links a { color: #94a3b8; }
.footer__links a:hover { color: #fff; }
.footer__copy { width: 100%; text-align: center; color: #64748b; }

/* ─── Messages (Django) ─── */
.messages {
  list-style: none;
  padding: .75rem 1rem;
}
.messages li {
  padding: .75rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: .5rem;
  font-size: .9rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.messages li.success { background: #f0fdf4; color: #16a34a; border: 1px solid #bbf7d0; }
.messages li.error   { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; }
.messages li.warning { background: #fffbeb; color: #d97706; border: 1px solid #fde68a; }
.messages li.info    { background: #eff6ff; color: var(--color-primary); border: 1px solid #bfdbfe; }

/* ─── Pagination ─── */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: .5rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: var(--color-surface);
  transition: background var(--transition), color var(--transition);
}
.pagination a:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.pagination .current { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ─── Utilities ─── */
.text-muted  { color: var(--color-text-muted); }
.text-center { text-align: center; }
.mt-1  { margin-top: .5rem; }
.mt-2  { margin-top: 1rem; }
.mt-3  { margin-top: 1.5rem; }
.mb-1  { margin-bottom: .5rem; }
.mb-2  { margin-bottom: 1rem; }
.mb-3  { margin-bottom: 1.5rem; }
.flex  { display: flex; }
.items-center { align-items: center; }
.gap-1 { gap: .5rem; }
.gap-2 { gap: 1rem; }