/* ============================================================
   Medical Digest Blog — style.css
   Dark medical theme with teal accents · RTL Persian layout
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-bg:          #0f172a;
  --color-surface:     #1e293b;
  --color-surface-alt: #273548;
  --color-primary:     #0d9488;
  --color-primary-dim: rgba(13, 148, 136, .15);
  --color-primary-glow:rgba(13, 148, 136, .35);
  --color-text:        #e2e8f0;
  --color-text-muted:  #94a3b8;
  --color-border:      #334155;
  --color-badge-rct:   #0d9488;
  --color-badge-meta:  #6366f1;
  --color-badge-sr:    #f59e0b;
  --color-badge-obs:   #ef4444;
  --color-badge-case:  #8b5cf6;
  --color-badge-guide: #10b981;
  --color-badge-other: #64748b;
  --font-family:       'Vazirmatn', 'Tahoma', 'Arial', sans-serif;
  --radius:            12px;
  --radius-sm:         8px;
  --shadow-card:       0 4px 24px rgba(0,0,0,.35);
  --shadow-card-hover: 0 8px 40px rgba(13,148,136,.18);
  --transition:        .3s cubic-bezier(.4,0,.2,1);
  --max-width:         1200px;
  --header-height:     auto;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  direction: rtl;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: #2dd4bf; }

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

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  background: linear-gradient(135deg, var(--color-surface) 0%, #162032 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.site-header::before {
  content: '';
  position: absolute;
  top: -60%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-primary-dim) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -60%;
  left: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--color-primary-dim) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.header-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
}

.header-icon {
  font-size: 2.5rem;
  margin-bottom: .5rem;
  display: block;
  opacity: .9;
}

.site-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: #fff;
  margin-bottom: .25rem;
}

.site-title span {
  color: var(--color-primary);
}

.site-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* ============================================================
   SEARCH BAR
   ============================================================ */
.search-wrapper {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding: 0 1.5rem;
}

.search-bar {
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: .65rem 1rem;
  gap: .6rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-bar:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-dim);
}

.search-icon {
  color: var(--color-text-muted);
  flex-shrink: 0;
  font-size: 1.1rem;
}

.search-bar input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: 1rem;
  direction: rtl;
}

.search-bar input::placeholder {
  color: var(--color-text-muted);
}

.search-filters {
  display: flex;
  gap: .5rem;
  margin-top: .75rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: .35rem .85rem;
  border-radius: 999px;
  font-family: var(--font-family);
  font-size: .82rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary-dim);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.no-results {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--color-text-muted);
  display: none;
  font-size: 1.1rem;
}

.no-results.visible {
  display: block;
}

/* ============================================================
   MAIN / CARD GRID
   ============================================================ */
main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  width: 100%;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* ---------- Card ---------- */
.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-right: 4px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-right-color: #2dd4bf;
}

.post-card:hover::before {
  opacity: 1;
}

.post-card a {
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  flex: 1;
}

.post-card a:hover { color: inherit; }

/* Card meta row */
.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  flex-wrap: wrap;
}

.card-date {
  font-size: .85rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: .35rem;
}

.card-date svg {
  width: 14px;
  height: 14px;
  opacity: .7;
}

.card-badge {
  font-size: .72rem;
  font-weight: 600;
  padding: .2rem .6rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: .03em;
  white-space: nowrap;
}

.badge-rct      { background: rgba(13,148,136,.2);   color: #2dd4bf; }
.badge-meta     { background: rgba(99,102,241,.2);    color: #a5b4fc; }
.badge-sr       { background: rgba(245,158,11,.2);    color: #fbbf24; }
.badge-obs      { background: rgba(239,68,68,.2);     color: #fca5a5; }
.badge-case     { background: rgba(139,92,246,.2);    color: #c4b5fd; }
.badge-guide    { background: rgba(16,185,129,.2);    color: #6ee7b7; }
.badge-other    { background: rgba(100,116,139,.2);   color: #cbd5e1; }

/* Card title */
.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.6;
  color: #fff;
  transition: color var(--transition);
}

.post-card:hover .card-title {
  color: var(--color-primary);
}

/* Card summary */
.card-summary {
  font-size: .92rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card footer */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: .75rem;
  border-top: 1px solid var(--color-border);
}

.reading-time {
  font-size: .8rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: .3rem;
}

.reading-time svg {
  width: 14px;
  height: 14px;
  opacity: .7;
}

.card-arrow {
  color: var(--color-primary);
  transition: transform var(--transition);
}

.post-card:hover .card-arrow {
  transform: translateX(-4px);
}

/* Empty state */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1rem;
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: .5;
}

.empty-state h2 {
  font-size: 1.3rem;
  margin-bottom: .5rem;
  color: var(--color-text);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: 1.5rem;
  font-size: .85rem;
  color: var(--color-text-muted);
}

.site-footer a { color: var(--color-primary); }

/* ============================================================
   POST PAGE
   ============================================================ */
.post-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 2.5rem;
  width: 100%;
}

.post-article {
  min-width: 0;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: .5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: .9rem;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 1.5rem;
}

.back-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-dim);
}

.post-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.post-header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.6;
  margin-bottom: 1rem;
  color: #fff;
}

.post-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: .35rem;
  font-size: .88rem;
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: .3rem .8rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
}

.meta-item svg {
  width: 14px;
  height: 14px;
  opacity: .7;
}

/* Post body */
.post-body {
  font-size: 1.05rem;
  line-height: 2;
}

.post-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
  color: #fff;
  padding-right: .75rem;
  border-right: 3px solid var(--color-primary);
}

.post-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.5rem 0 .75rem;
  color: var(--color-text);
}

.post-body p {
  margin-bottom: 1.25rem;
}

.post-body ul, .post-body ol {
  margin: 1rem 0;
  padding-right: 1.5rem;
}

.post-body li {
  margin-bottom: .5rem;
}

.post-body blockquote {
  background: var(--color-primary-dim);
  border-right: 4px solid var(--color-primary);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-text-muted);
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: .92rem;
}

.post-body th, .post-body td {
  padding: .65rem .85rem;
  border: 1px solid var(--color-border);
  text-align: right;
}

.post-body th {
  background: var(--color-surface-alt);
  font-weight: 600;
  color: #fff;
}

.post-body tr:nth-child(even) td {
  background: rgba(30, 41, 59, .5);
}

.post-body code {
  background: var(--color-surface-alt);
  padding: .15rem .45rem;
  border-radius: 4px;
  font-size: .9em;
}

/* Table of Contents sidebar */
.post-toc {
  position: sticky;
  top: 1.5rem;
  align-self: start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.toc-title {
  font-size: .9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: .75rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--color-border);
}

.toc-list {
  list-style: none;
  padding: 0;
}

.toc-list li {
  margin-bottom: .35rem;
}

.toc-list a {
  font-size: .82rem;
  color: var(--color-text-muted);
  display: block;
  padding: .25rem .5rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  border-right: 2px solid transparent;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--color-primary);
  background: var(--color-primary-dim);
  border-right-color: var(--color-primary);
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
  body { background: #fff; color: #111; }
  .site-header, .site-footer, .back-btn, .post-toc, .search-wrapper { display: none !important; }
  .post-layout { grid-template-columns: 1fr; padding: 0; }
  .post-article { max-width: 100%; }
  .post-body { font-size: 11pt; line-height: 1.6; }
  .post-header h1 { color: #111; font-size: 18pt; }
  .post-body h2 { color: #111; }
  .meta-item { border: 1px solid #ccc; color: #444; }
  .card-badge { border: 1px solid #ccc; color: #333; }
  a { color: #111; text-decoration: underline; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .posts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .post-layout {
    grid-template-columns: 1fr;
  }
  .post-toc {
    position: static;
    order: -1;
  }
}

@media (max-width: 640px) {
  .posts-grid {
    grid-template-columns: 1fr;
  }
  .site-title { font-size: 1.6rem; }
  .site-subtitle { font-size: .92rem; }
  main { padding: 1.25rem 1rem 2rem; }
  .post-layout { padding: 1.25rem 1rem 2rem; }
  .post-header h1 { font-size: 1.4rem; }
  .post-meta-row { gap: .5rem; }
  .search-filters { gap: .35rem; }
  .filter-btn { font-size: .75rem; padding: .3rem .65rem; }
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.post-card {
  animation: fadeInUp .5s ease both;
}

.posts-grid .post-card:nth-child(1) { animation-delay: .05s; }
.posts-grid .post-card:nth-child(2) { animation-delay: .1s; }
.posts-grid .post-card:nth-child(3) { animation-delay: .15s; }
.posts-grid .post-card:nth-child(4) { animation-delay: .2s; }
.posts-grid .post-card:nth-child(5) { animation-delay: .25s; }
.posts-grid .post-card:nth-child(6) { animation-delay: .3s; }
.posts-grid .post-card:nth-child(7) { animation-delay: .35s; }
.posts-grid .post-card:nth-child(8) { animation-delay: .4s; }
.posts-grid .post-card:nth-child(9) { animation-delay: .45s; }