/*
Theme Name: Pro Trader
Theme URI: https://protrader.vn
Author: Pro Trader Performance & SEO Team
Author URI: https://protrader.vn
Description: Ultra-fast, minimalist, performance-first and AI-optimized (AIO/GEO) WordPress theme designed for financial analysts and Vietnamese stock market investors. Core Web Vitals < 2.0s, zero external dependencies, 100% native CSS/Vanilla JS.
Version: 1.0.0
Tested up to: 6.6
Requires at least: 6.0
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: protrader
Tags: financial, stock-market, performance, minimal, fast, seo, clean, responsive
*/

/* ==========================================================================
   1. CSS VARIABLES & SYSTEM DESIGN TOKENS
   ========================================================================== */
:root {
  /* System Font Stack - Zero FOIT/FOUT, Instant Text Rendering */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Typography Scale */
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1.0625rem; /* 17px - optimal reading size */
  --font-size-md: 1.25rem;     /* 20px */
  --font-size-lg: 1.5rem;      /* 24px */
  --font-size-xl: 1.875rem;    /* 30px */
  --font-size-2xl: 2.25rem;    /* 36px */
  --font-size-3xl: 2.75rem;    /* 44px */

  --line-height-tight: 1.25;
  --line-height-normal: 1.6;
  --line-height-loose: 1.75;

  /* Monochrome High-Contrast Financial Palette */
  --color-bg: #ffffff;
  --color-bg-surface: #f8fafc;
  --color-bg-subtle: #f1f5f9;
  --color-text-main: #0f172a;     /* Slate 900 */
  --color-text-muted: #475569;    /* Slate 600 */
  --color-text-faint: #94a3b8;    /* Slate 400 */
  --color-border: #e2e8f0;        /* Slate 200 */
  --color-border-dark: #0f172a;
  
  /* Financial Data Semantics */
  --color-bull: #15803d;          /* Green 700 */
  --color-bull-bg: #f0fdf4;
  --color-bear: #b91c1c;          /* Red 700 */
  --color-bear-bg: #fef2f2;
  --color-neutral: #d97706;       /* Amber 700 */
  --color-neutral-bg: #fffbeb;

  /* Container Measurements */
  --container-max-w: 1160px;
  --article-max-w: 740px;         /* 65-75 chars per line for reading */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1.25rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4.5rem;

  --transition-fast: 0.15s ease-in-out;
  --radius-sm: 4px;
  --radius-md: 6px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

/* Optional Dark Mode (Respects User System Settings) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0b0f17;
    --color-bg-surface: #111827;
    --color-bg-subtle: #1f2937;
    --color-text-main: #f9fafb;
    --color-text-muted: #9ca3af;
    --color-text-faint: #6b7280;
    --color-border: #1f2937;
    --color-border-dark: #f9fafb;

    --color-bull: #22c55e;
    --color-bull-bg: #052e16;
    --color-bear: #ef4444;
    --color-bear-bg: #450a0a;
    --color-neutral: #f59e0b;
    --color-neutral-bg: #451a03;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  }
}

/* ==========================================================================
   2. MODERN CSS RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: var(--line-height-normal);
  color: var(--color-text-main);
  background-color: var(--color-bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.8;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-text-main);
}

/* Tabular numbers for financial tickers and price data */
.num, .stock-price, .financial-data, table td {
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}

/* Skip link for Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-text-main);
  color: var(--color-bg);
  padding: 0.5rem 1rem;
  z-index: 9999;
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus {
  top: 1rem;
}

/* ==========================================================================
   3. LAYOUT & GRID ARCHITECTURE
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.article-container {
  width: 100%;
  max-width: var(--article-max-w);
  margin-left: auto;
  margin-right: auto;
}

.site-main {
  flex: 1 0 auto;
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-2xl);
}

/* Reading Progress Bar (Pure CSS / Lightweight JS binding) */
#reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--color-text-main);
  z-index: 1000;
  transition: width 0.05s linear;
}

/* ==========================================================================
   4. SITE HEADER & NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  text-decoration: none;
}

.brand-logo-text {
  font-family: var(--font-sans);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  color: var(--color-text-main);
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 700;
  background-color: var(--color-text-main);
  color: var(--color-bg);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.site-nav > ul,
.site-nav .primary-menu-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
  margin: 0;
  padding: 0;
  align-items: center;
}

.site-nav li {
  position: relative;
  list-style: none;
}

.site-nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: nowrap;
  display: block;
}

.site-nav a:hover,
.site-nav a:focus,
.site-nav .current-menu-item > a,
.site-nav .current_page_item > a {
  color: var(--color-text-main);
  font-weight: 600;
}

/* Dropdown Sub-menu */
.site-nav .sub-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  min-width: 180px;
  padding: var(--spacing-xs) 0;
  z-index: 999;
  flex-direction: column;
  gap: 0;
  margin: 0;
  list-style: none;
}

.site-nav li:hover > .sub-menu,
.site-nav li:focus-within > .sub-menu {
  display: flex;
}

.site-nav .sub-menu li {
  width: 100%;
}

.site-nav .sub-menu a {
  padding: var(--spacing-xs) var(--spacing-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  white-space: nowrap;
}

.site-nav .sub-menu a:hover,
.site-nav .sub-menu a:focus {
  background-color: var(--color-bg-surface);
  color: var(--color-text-main);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-main);
}

/* ==========================================================================
   5. BREADCRUMBS (SEO & AIO READY)
   ========================================================================== */
.breadcrumbs {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-xs) 0;
  border-bottom: 1px dashed var(--color-border);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.35rem;
  color: var(--color-text-faint);
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  text-decoration: underline;
  color: var(--color-text-main);
}

/* ==========================================================================
   6. ARTICLE & SINGLE POST ARCHITECTURE
   ========================================================================== */
.article-header {
  margin-bottom: var(--spacing-lg);
}

.article-category-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-main);
  background-color: var(--color-bg-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  text-decoration: none;
}

.article-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.meta-author a {
  color: var(--color-text-main);
  font-weight: 600;
  text-decoration: none;
}

.meta-author a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   7. TL;DR KEY TAKEAWAYS (AIO & AI-CRAWLER OPTIMIZATION BOX)
   ========================================================================== */
.tldr-box {
  background-color: var(--color-bg-surface);
  border-left: 4px solid var(--color-text-main);
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.tldr-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.tldr-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tldr-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--color-text-main);
  color: var(--color-bg);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.tldr-content {
  font-size: var(--font-size-base);
  color: var(--color-text-main);
  line-height: var(--line-height-normal);
}

.tldr-content ul {
  list-style: none;
  padding-left: 0;
  margin-top: var(--spacing-xs);
}

.tldr-content li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.5rem;
}

.tldr-content li::before {
  content: "—";
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--color-text-muted);
}

/* ==========================================================================
   8. TABLE OF CONTENTS (TOC - NATIVE & LIGHTWEIGHT)
   ========================================================================== */
.protrader-toc {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.toc-title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.toc-toggle-btn {
  background: none;
  border: none;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 2px 6px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin-top: var(--spacing-sm);
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-sm);
}

.toc-item {
  margin-bottom: 0.4rem;
  font-size: var(--font-size-sm);
  line-height: 1.4;
}

.toc-item.toc-h3 {
  padding-left: 1.25rem;
  font-size: 0.8125rem;
}

.toc-item a {
  color: var(--color-text-muted);
  text-decoration: none;
  display: inline-block;
  transition: color var(--transition-fast);
}

.toc-item a:hover,
.toc-item.active > a {
  color: var(--color-text-main);
  font-weight: 600;
  text-decoration: underline;
}

/* ==========================================================================
   9. EDITORIAL & PRO CONTENT TYPOGRAPHY
   ========================================================================== */
.article-body {
  font-size: var(--font-size-base);
  line-height: var(--line-height-loose);
  color: var(--color-text-main);
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body h2 {
  font-size: var(--font-size-xl);
  letter-spacing: -0.02em;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-border);
}

.article-body h3 {
  font-size: var(--font-size-lg);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

.article-body ul, 
.article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body blockquote {
  border-left: 3px solid var(--color-text-main);
  padding: var(--spacing-sm) var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  background-color: var(--color-bg-surface);
  font-style: italic;
  color: var(--color-text-muted);
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-bg-subtle);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

.article-body pre {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   10. FINANCIAL DATA TABLES (MOBILE OPTIMIZED & ZERO CLS)
   ========================================================================== */
.protrader-table-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--spacing-xl) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-bg);
}

.protrader-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: var(--font-size-sm);
  white-space: nowrap;
}

.protrader-table th {
  background-color: var(--color-bg-surface);
  color: var(--color-text-main);
  font-weight: 700;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--color-border);
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  letter-spacing: 0.05em;
}

.protrader-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-main);
}

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

.protrader-table tr:hover td {
  background-color: var(--color-bg-surface);
}

/* Badges for Tickers & Trading Signals */
.badge-bull {
  color: var(--color-bull);
  font-weight: 700;
}

.badge-bear {
  color: var(--color-bear);
  font-weight: 700;
}

.ticker-symbol {
  font-family: var(--font-mono);
  font-weight: 700;
  background: var(--color-bg-subtle);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-text-main);
}

/* ==========================================================================
   11. E-E-A-T AUTHOR PROFILE BOX
   ========================================================================== */
.author-eeat-box {
  display: flex;
  gap: var(--spacing-md);
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
}

.author-avatar {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-border);
  overflow: hidden;
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-details {
  flex: 1;
}

.author-label {
  font-size: var(--font-size-xs);
  font-family: var(--font-mono);
  text-transform: uppercase;
  color: var(--color-text-faint);
  letter-spacing: 0.05em;
}

.author-name {
  font-size: var(--font-size-md);
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.author-credentials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: var(--spacing-xs);
}

.credential-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  background-color: var(--color-bg-subtle);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

.author-bio {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
}

/* ==========================================================================
   12. FINANCIAL RISK DISCLAIMER (LEGAL & REGULATORY)
   ========================================================================== */
.risk-disclaimer-box {
  background-color: var(--color-neutral-bg);
  border: 1px solid var(--color-neutral);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  font-size: 0.8125rem;
  color: var(--color-text-main);
  line-height: 1.5;
}

.risk-disclaimer-title {
  font-weight: 700;
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
  color: var(--color-neutral);
}

/* ==========================================================================
   13. ARCHIVE / FEED & ARTICLE CARD GRID
   ========================================================================== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.article-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.article-card:hover {
  border-color: var(--color-border-dark);
}

.card-category {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.card-title {
  font-size: var(--font-size-md);
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-xs);
}

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

.card-title a:hover {
  text-decoration: underline;
}

.card-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  color: var(--color-text-faint);
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-sm);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: var(--spacing-2xl);
}

.pagination .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-main);
}

.pagination .page-numbers.current {
  background-color: var(--color-text-main);
  color: var(--color-bg);
  border-color: var(--color-text-main);
}

/* ==========================================================================
   14. SITE FOOTER
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-surface);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand h3 {
  font-size: var(--font-size-md);
  font-weight: 800;
  margin-bottom: var(--spacing-xs);
}

.footer-section h4 {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-faint);
  margin-bottom: var(--spacing-sm);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.4rem;
}

.footer-section a {
  text-decoration: none;
  color: var(--color-text-muted);
}

.footer-section a:hover {
  color: var(--color-text-main);
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-faint);
}

/* ==========================================================================
   15. RESPONSIVE BREAKPOINTS (MOBILE FIRST ADAPTATIONS)
   ========================================================================== */
@media (max-width: 1024px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

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

  .site-nav > ul,
  .site-nav .primary-menu-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .site-nav li {
    width: 100%;
  }

  .site-nav .sub-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding-left: var(--spacing-md);
    padding-top: var(--spacing-xs);
    display: flex;
    background: transparent;
  }

  .nav-toggle {
    display: block;
  }
}

@media (max-width: 768px) {

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

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

  .author-eeat-box {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ==========================================================================
   DIRECT ANSWER BOX (GOOGLE AI OVERVIEWS & AIO / SGE SNIPPETS)
   ========================================================================== */
.direct-answer-box {
  background-color: var(--color-bg-surface);
  border-left: 4px solid #0284c7;
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
}

.direct-answer-box strong {
  color: var(--color-text-main);
}