/* ==========================================================================
   PostOpSurgeon.com - Clinical Design System
   Impeccable Typography, High-Contrast Accessible Palette, Responsive
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Charter", "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Clinical Palette (OKLCH-equivalent values in hex/hsl for universal browser compatibility) */
  --color-primary: #0369a1;         /* Ocean Clinical Blue */
  --color-primary-dark: #075985;    /* Deep Navy Blue */
  --color-primary-light: #e0f2fe;   /* Crisp Sky Tint */
  --color-accent: #0f766e;          /* Surgical Teal */
  --color-accent-light: #ccfbf1;    /* Mint Wash */
  
  --color-text-main: #0f172a;       /* Slate 900 (High-contrast reading) */
  --color-text-muted: #475569;      /* Slate 600 */
  --color-text-light: #64748b;      /* Slate 500 */
  
  --color-bg-body: #f8fafc;         /* Crisp Warm White Slate */
  --color-bg-surface: #ffffff;      /* Pure White Surface */
  --color-border: #e2e8f0;          /* Clean Subdued Divider */
  --color-border-hover: #cbd5e1;

  --color-alert-red: #b91c1c;       /* Red Flag Warning */
  --color-alert-red-bg: #fef2f2;
  --color-alert-red-border: #fecaca;

  --color-ad-placeholder: #f1f5f9;  /* Clean ad slot container */
  --color-ad-border: #e2e8f0;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  
  --max-width: 1200px;
  --max-prose: 760px;
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* Header & Navigation */
.site-header {
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-badge {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  letter-spacing: -0.02em;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
}

.brand-name span {
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 0.4rem 0.2rem;
  transition: all 0.15s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
  background: var(--color-primary-dark);
}

/* Medical Disclaimer Banner */
.disclaimer-banner {
  background: #f0fdf4;
  border-bottom: 1px solid #bbf7d0;
  color: #166534;
  font-size: 0.82rem;
  padding: 0.4rem 1.5rem;
  text-align: center;
}

.disclaimer-banner strong {
  font-weight: 700;
}

/* Layout Containers */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
}

/* Hero Section */
.hero {
  background: linear-gradient(180deg, #ffffff 0%, #f0f9ff 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 3.5rem 1.5rem 4rem;
  text-align: center;
}

.hero-inner {
  max-width: 820px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.04em;
  color: var(--color-text-main);
  margin-bottom: 1rem;
}

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

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.doctor-verified-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
  color: var(--color-text-main);
}

.doctor-verified-badge .avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
}

/* Category Pills / Filters */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  margin: 2rem 0;
}

.filter-btn {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.article-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.card-thumb {
  width: 100%;
  height: 190px;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-featured-img {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: 1.75rem;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  max-height: 420px;
  object-fit: cover;
}

.card-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  margin-bottom: 0.9rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.card-title a {
  color: var(--color-text-main);
  text-decoration: none;
}

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

.card-snippet {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  padding-top: 0.85rem;
  font-size: 0.82rem;
  color: var(--color-text-light);
}

.card-meta-author {
  font-weight: 600;
  color: var(--color-text-main);
}

/* AdSense Slot Mockups */
.ad-slot-leaderboard {
  max-width: var(--max-width);
  margin: 1.5rem auto;
  padding: 0.75rem;
  background: var(--color-ad-placeholder);
  border: 1px dashed var(--color-ad-border);
  border-radius: var(--radius-sm);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.ad-slot-inarticle {
  margin: 2.25rem 0;
  padding: 1.25rem;
  background: var(--color-ad-placeholder);
  border: 1px dashed var(--color-ad-border);
  border-radius: var(--radius-sm);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.75rem;
  text-transform: uppercase;
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

/* ==========================================================================
   Article Single Page Typography & Components
   ========================================================================== */

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.article-main {
  max-width: var(--max-prose);
}

.article-header {
  margin-bottom: 2rem;
}

.article-breadcrumbs {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.article-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
  margin-bottom: 1rem;
}

.byline-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.75rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.byline-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

/* Featured Snippet / Quick Answer Box */
.quick-answer-box {
  background: #f0fdf4;
  border-left: 4px solid #16a34a;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1.5rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

.quick-answer-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #15803d;
  margin-bottom: 0.6rem;
}

.quick-answer-text {
  font-size: 1.05rem;
  line-height: 1.6;
  color: #14532d;
  font-weight: 500;
}

/* Prose Styling */
.prose {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.75;
  color: #1e293b;
}

.prose h2 {
  font-family: var(--font-sans);
  font-size: 1.65rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--color-text-main);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
}

.prose h3 {
  font-family: var(--font-sans);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin: 1.75rem 0 0.75rem;
}

.prose p {
  margin-bottom: 1.35rem;
}

.prose ul, .prose ol {
  margin: 1.25rem 0 1.5rem 1.5rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  text-align: left;
}

th {
  background: #f1f5f9;
  color: var(--color-text-main);
  font-weight: 700;
  padding: 0.85rem 1rem;
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  vertical-align: top;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: #f8fafc;
}

/* Red Flag Warning Box */
.red-flag-box {
  background: var(--color-alert-red-bg);
  border: 1px solid var(--color-alert-red-border);
  border-left: 5px solid var(--color-alert-red);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin: 2.25rem 0;
}

.red-flag-title {
  color: var(--color-alert-red);
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.red-flag-list {
  font-family: var(--font-sans);
  color: #7f1d1d;
  font-size: 0.95rem;
  line-height: 1.6;
  margin-left: 1.25rem;
}

/* References Section */
.references-box {
  margin-top: 3rem;
  padding: 1.75rem;
  background: #f8fafc;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.88rem;
}

.references-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text-main);
}

.references-list {
  list-style: decimal;
  margin-left: 1.5rem;
  color: var(--color-text-muted);
}

.references-list li {
  margin-bottom: 0.85rem;
}

/* Sidebar */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sticky-sidebar-block {
  position: sticky;
  top: 5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.sidebar-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.sidebar-card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  color: var(--color-text-main);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.toc-list {
  list-style: none;
  font-size: 0.88rem;
}

.toc-list li {
  margin-bottom: 0.55rem;
}

.toc-list a {
  color: var(--color-text-muted);
}

.toc-list a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* Author Box */
.author-box {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin: 3rem 0;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
}

.author-avatar-lg {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.author-info h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 0.25rem;
}

.author-role {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 0.65rem;
}

.author-bio {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  margin-top: auto;
  border-top: 1px solid #1e293b;
  font-size: 0.88rem;
  padding: 3.5rem 1.5rem 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-col h5 {
  color: #f8fafc;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #94a3b8;
}

.footer-links a:hover {
  color: #38bdf8;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid #1e293b;
  text-align: center;
  font-size: 0.8rem;
  color: #64748b;
}

/* Responsive */
@media (max-width: 900px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .sticky-sidebar-block {
    position: static;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .hero-title {
    font-size: 2.1rem;
  }
}