/**
 * Booktoan Pro - Modern Effects CSS
 * Hiệu ứng hiện đại: glassmorphism, animations, micro-interactions
 * Phong cách: React / Astro SPA-like smoothness
 */

/* =============================
   1. CSS CUSTOM PROPERTIES
   ============================= */
:root {
  /* Brand Colors */
  --color-primary:       #1565C0;
  --color-primary-dark:  #0D47A1;
  --color-primary-light: #1976D2;
  --color-accent:        #0277BD;
  --color-accent-hover:  #01579B;
  --color-highlight:     #1B5E20;

  /* Neutral */
  --color-bg:            #fafafa;
  --color-surface:       #ffffff;
  --color-surface-2:     #f5f7fa;
  --color-text:          #111111;   /* Đen sâu - giống sách in */
  --color-text-muted:    #555555;
  --color-border:        #e0e4ea;

  /* Gradients */
  --gradient-brand:   linear-gradient(135deg, #1565C0 0%, #1976D2 100%);
  --gradient-hero:    linear-gradient(160deg, #0D2B6B 0%, #1565C0 50%, #1976D2 100%);
  --gradient-card:    linear-gradient(145deg, #ffffff 0%, #f5f7fa 100%);
  --gradient-accent:  linear-gradient(90deg, #1565C0, #1976D2);
  --gradient-warm:    linear-gradient(135deg, #1B3A8A 0%, #1565C0 100%);

  /* Shadows */
  --shadow-sm:    0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:    0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.05);
  --shadow-lg:    0 12px 40px rgba(0,0,0,.12), 0 4px 12px rgba(0,0,0,.06);
  --shadow-xl:    0 24px 64px rgba(0,0,0,.16);
  --shadow-brand: 0 8px 32px rgba(21,101,192,.25);
  --shadow-glow:  0 0 24px rgba(25,118,210,.3);

  /* Glassmorphism */
  --glass-bg:     rgba(255,255,255,.85);
  --glass-border: rgba(255,255,255,.5);
  --glass-blur:   blur(20px);
  --glass-nav-bg: rgba(255,255,255,.92);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl:64px;

  /* Typography - Font sách toán việt */
  --font-main:    'Be Vietnam Pro', 'STIX Two Text', 'Times New Roman', serif;
  --font-heading: 'Be Vietnam Pro', sans-serif;
  --font-serif:   'STIX Two Text', 'Times New Roman', Georgia, serif; /* dùng cho nội dung toán */
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  /* Radius */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;
  --radius-full:9999px;

  /* Transitions */
  --transition-fast:   150ms cubic-bezier(0.4,0,0.2,1);
  --transition-normal: 250ms cubic-bezier(0.4,0,0.2,1);
  --transition-slow:   400ms cubic-bezier(0.4,0,0.2,1);
  --transition-spring: 500ms cubic-bezier(0.34,1.56,0.64,1);
}


/* =============================
   2. BASE FONT OVERRIDE
   ============================= */
body {
  font-family: var(--font-main);
  color: var(--color-text); /* #111111 - đen sách */
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  font-size: 17px;       /* cỡ chữ sách, thoải mái đọc */
  line-height: 1.85;     /* giãn dòng phù hợp tiếng Việt */
}

/* Đầu đề - dùng Be Vietnam Pro (sans-serif sắc nét) */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: 1.3;
  font-weight: 600;
}

/* Nội dung toán - dùng STIX Two Text (tương thích LaTeX) */
.entry-content,
.single .entry-content {
  font-family: var(--font-serif);
}

a {
  color: var(--color-primary); /* xanh blue #1565C0 */
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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


/* =============================
   3. STICKY HEADER / NAV GLASS
   ============================= */
.nav-primary {
  background: var(--glass-nav-bg) !important;
  backdrop-filter: var(--glass-blur) saturate(180%);
  -webkit-backdrop-filter: var(--glass-blur) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 24px rgba(0,0,0,.06);
  transition: background var(--transition-normal),
              box-shadow var(--transition-normal);
}

/* when scrolled, stronger glass */
.nav-primary.scrolled {
  background: rgba(255,255,255,.95) !important;
  box-shadow: var(--shadow-md);
}

.nav-primary .genesis-nav-menu a {
  color: var(--color-text) !important;
  font-family: var(--font-main);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.01em;
  padding: 20px 16px;
  position: relative;
  transition: color var(--transition-fast);
}

/* Animated underline on nav links */
.nav-primary .genesis-nav-menu > .menu-item > a::after {
  content: '';
  position: absolute;
  bottom: 12px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.nav-primary .genesis-nav-menu > .menu-item:hover > a::after,
.nav-primary .genesis-nav-menu > .current-menu-item > a::after,
.nav-primary .genesis-nav-menu > .current-menu-ancestor > a::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-primary .genesis-nav-menu a:focus,
.nav-primary .genesis-nav-menu a:hover,
.nav-primary .genesis-nav-menu .current-menu-item > a {
  color: var(--color-primary) !important;
}

/* Dropdown submenu - glassmorphism */
.nav-primary .genesis-nav-menu .sub-menu {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  margin-top: 8px;
  overflow: hidden;
  transition: opacity var(--transition-normal),
              transform var(--transition-normal);
  transform: translateY(-8px);
}

.nav-primary .genesis-nav-menu .menu-item:hover > .sub-menu {
  transform: translateY(0);
}

.nav-primary .genesis-nav-menu .sub-menu a {
  background: transparent !important;
  border: none !important;
  border-bottom: 1px solid rgba(0,0,0,.05) !important;
  color: var(--color-text) !important;
  font-size: 13px;
  font-weight: 400;
  padding: 12px 20px !important;
  transition: background var(--transition-fast), color var(--transition-fast), padding-left var(--transition-fast);
  width: 210px !important;
}

.nav-primary .genesis-nav-menu .sub-menu a:hover {
  background: rgba(27,108,168,.08) !important;
  color: var(--color-primary) !important;
  padding-left: 26px !important;
}

/* Mobile menu toggle styled */
.menu-toggle {
  background: var(--gradient-brand) !important;
  color: #fff !important;
  border-radius: var(--radius-sm) !important;
  font-family: var(--font-main) !important;
  font-weight: 600 !important;
  letter-spacing: 0.05em;
}

.sub-menu-toggle {
  color: var(--color-primary) !important;
}

/* =============================
   4. SITE HEADER
   ============================= */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-title a {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: var(--font-heading) !important;
  font-weight: 800 !important;
  transition: opacity var(--transition-fast);
}

.site-title a:hover {
  opacity: 0.85;
}

/* =============================
   5. ENTRY / ARTICLE CARDS
   ============================= */
.entry {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.15); /* bóng đổ hơi tím nhẹ mặc định */
  border: 1px solid rgba(139, 92, 246, 0.3); /* viền tím nhẹ */
  transition: box-shadow var(--transition-normal),
              transform var(--transition-normal),
              border-color var(--transition-normal);
  margin-bottom: 28px !important;
}

.entry:hover {
  box-shadow: 0 8px 32px rgba(139, 92, 246, 0.3); /* bóng đổ nổi màu tím mạnh hơn */
  transform: translateY(-4px);
  border-color: rgba(139, 92, 246, 0.8); /* border viền tím nổi rõ */
}

/* Archive entry cards */
.archive .content .entry,
.page-template-page_blog-php .content .entry {
  /* xóa cái cùi cũ, reset lại */
  border-bottom: 1px solid rgba(139, 92, 246, 0.3) !important;
}

.entry-title {
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.entry-title a {
  color: var(--color-primary) !important; /* Xanh blue */
  background: linear-gradient(
    to right,
    var(--color-primary),
    var(--color-primary)
  );
  background-size: 0 2px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size var(--transition-normal),
              color var(--transition-fast);
  padding-bottom: 2px;
}

.entry-title a:hover {
  color: #10B981 !important; /* Xanh green (Emerald) */
  background: linear-gradient(
    to right,
    #10B981,
    #10B981
  );
  background-size: 100% 2px;
}

.entry-meta {
  font-size: 13px;
  color: #DC2626 !important; /* Chữ đỏ nhẹ */
  font-weight: 500;
  letter-spacing: 0.03em;
  background-color: #E0F2FE; /* Nền xanh blue nhẹ */
  padding: 8px 14px;
  border-radius: 8px;
  display: inline-block;
  margin-bottom: 20px;
}

.entry-meta a {
  color: #DC2626; /* Chữ đỏ nhẹ */
}

.entry-meta a:hover {
  color: #991B1B; /* Đỏ dậm hơn chút xíu khi hover link */
}

/* Featured image zoom on hover */
.entry .alignnone img,
.entry .post-image,
.featured-content a.alignnone img {
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-slow);
  display: block;
}

.entry:hover .alignnone img,
.entry:hover .post-image {
  transform: scale(1.03);
}

/* entry image wrapper clip */
.entry .alignnone {
  overflow: hidden;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

/* =============================
   6. ENTRY CONTENT TYPOGRAPHY
   ============================= */
.entry-content {
  font-family: var(--font-serif);   /* STIX Two Text - tương thích LaTeX/MathJax */
  font-size: 17px;
  line-height: 1.9;
  color: #111111;                   /* Đen sách */
}

.entry-content h2 {
  font-family: var(--font-heading);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  margin: 40px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--color-primary);
  color: #111111;
}

.entry-content h3 {
  font-family: var(--font-heading);
  font-size: clamp(17px, 2.5vw, 22px);
  font-weight: 600;
  margin: 32px 0 12px;
  color: #111111;
}

.entry-content h4,
.entry-content h5,
.entry-content h6 {
  font-family: var(--font-heading);
  color: #111111;
}

/* Link trong bài viết - xanh blue, dễ đọc */
.entry-content a {
  color: #1565C0;
  text-decoration: underline;
  text-decoration-color: rgba(21,101,192,.35);
  text-underline-offset: 3px;
  font-weight: 500;
  transition: color var(--transition-fast),
              text-decoration-color var(--transition-fast);
}

.entry-content a:hover {
  color: #0D47A1;
  text-decoration-color: #0D47A1;
}


.entry-content blockquote {
  border-left: 4px solid var(--color-accent);
  background: linear-gradient(135deg,rgba(0,180,216,.05),rgba(27,108,168,.05));
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 28px 0;
  padding: 20px 24px;
  color: var(--color-text);
  font-style: italic;
}

.entry-content code {
  background: rgba(27,108,168,.08);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 7px;
  color: var(--color-primary-dark);
}

.entry-content pre {
  background: #0f2942;
  border-radius: var(--radius-md);
  padding: 24px;
  overflow-x: auto;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  box-shadow: var(--shadow-lg);
}

/* =============================
   7. SIDEBAR REDESIGN
   ============================= */
.sidebar .widget {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  margin-bottom: 24px !important;
  transition: box-shadow var(--transition-normal);
}

.sidebar .widget:hover {
  box-shadow: var(--shadow-md);
}

.sidebar .widget-title {
  background: var(--gradient-brand) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  background-clip: text !important;
  color: transparent !important;
  font-family: var(--font-heading) !important;
  font-size: 13px !important;
  font-weight: 700 !important;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px !important;
  padding: 0 !important;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 12px !important;
}

.sidebar li {
  border-bottom: 1px solid var(--color-border) !important;
  padding: 8px 0 !important;
  margin: 0 !important;
  transition: padding-left var(--transition-fast);
}

.sidebar li:hover {
  padding-left: 8px;
}

.sidebar li a {
  color: var(--color-text) !important;
  font-weight: 500;
  font-size: 14px;
}

.sidebar li a:hover {
  color: var(--color-primary) !important;
}

/* =============================
   8. BUTTONS - CTA STYLE
   ============================= */
button, input[type="button"],
input[type="reset"], input[type="submit"],
.button, .entry-content .button {
  background: var(--gradient-brand) !important;
  border: none !important;
  border-radius: var(--radius-lg) !important;
  font-family: var(--font-main) !important;
  font-size: 14px !important;
  font-weight: 600 !important;
  letter-spacing: 0.04em;
  padding: 12px 28px !important;
  text-transform: none !important;
  box-shadow: 0 4px 16px rgba(27,108,168,.3);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              opacity var(--transition-fast) !important;
}

button:hover, input[type="button"]:hover,
input[type="submit"]:hover, .button:hover,
.entry-content .button:hover {
  background: var(--gradient-brand) !important;
  transform: translateY(-2px) !important;
  box-shadow: 0 8px 28px rgba(27,108,168,.4) !important;
  color: #fff !important;
  opacity: 0.95;
}

button:active, .button:active {
  transform: translateY(0) !important;
  box-shadow: 0 2px 8px rgba(27,108,168,.2) !important;
}

/* =============================
   9. SEARCH FORM
   ============================= */
.search-form input[type="search"] {
  border: 2px solid var(--color-border) !important;
  border-radius: var(--radius-lg) !important;
  font-family: var(--font-main) !important;
  font-size: 14px !important;
  padding: 12px 20px !important;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast) !important;
  background: var(--color-surface) !important;
  color: var(--color-text) !important;
}

.search-form input[type="search"]:focus {
  border-color: var(--color-primary) !important;
  box-shadow: 0 0 0 3px rgba(27,108,168,.15) !important;
  outline: none !important;
}

/* =============================
   10. PAGINATION
   ============================= */
.archive-pagination li a {
  background: var(--color-surface) !important;
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-md) !important;
  color: var(--color-text) !important;
  font-family: var(--font-main) !important;
  font-weight: 600;
  padding: 8px 16px !important;
  transition: all var(--transition-fast) !important;
}

.archive-pagination li a:hover,
.archive-pagination li.active a {
  background: var(--gradient-brand) !important;
  border-color: transparent !important;
  color: #fff !important;
  box-shadow: var(--shadow-brand);
  transform: translateY(-1px);
}

/* =============================
   11. FOOTER REDESIGN
   ============================= */
.footer-widgets {
  background: linear-gradient(160deg, #0f2942 0%, #1b4f72 100%) !important;
  padding: 60px 0 40px !important;
}

.footer-widgets .widget-title {
  color: #fff !important;
  font-family: var(--font-heading) !important;
  font-weight: 700 !important;
  font-size: 13px !important;
  letter-spacing: 0.12em !important;
  text-transform: uppercase !important;
  border-bottom: 1px solid rgba(255,255,255,.15) !important;
  padding-bottom: 12px !important;
  margin-bottom: 20px !important;
  background: none !important;
}

.footer-widgets a {
  color: rgba(255,255,255,.75) !important;
  transition: color var(--transition-fast);
}

.footer-widgets a:hover {
  color: var(--color-accent) !important;
}

.footer-widgets li {
  border-color: rgba(255,255,255,.08) !important;
  padding: 8px 0 !important;
  margin: 0 !important;
}

.site-footer {
  background: #0a1929 !important;
  color: rgba(255,255,255,.5) !important;
  font-family: var(--font-main);
  font-size: 13px !important;
}

.site-footer .wrap {
  border-top: 1px solid rgba(255,255,255,.08) !important;
}

.site-footer a {
  color: var(--color-accent) !important;
}

.site-footer a:hover {
  color: #fff !important;
}

/* =============================
   12. ARCHIVE / BREADCRUMB
   ============================= */
.breadcrumb {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-md);
  padding: 10px 18px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 32px !important;
}

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

/* =============================
   13. CONTENT BOXES (existing)
   ============================= */
.content-box-blue, .content-box-gray,
.content-box-green, .content-box-purple,
.content-box-red, .content-box-yellow {
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 24px;
}

/* =============================
   14. SCROLL ANIMATIONS
   (works with JS IntersectionObserver)
   ============================= */
.bt-fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s cubic-bezier(0.4,0,0.2,1),
              transform 0.6s cubic-bezier(0.4,0,0.2,1);
}

.bt-fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.bt-fade-in-delay-1 { transition-delay: 0.1s; }
.bt-fade-in-delay-2 { transition-delay: 0.2s; }
.bt-fade-in-delay-3 { transition-delay: 0.3s; }

/* Slide from left */
.bt-slide-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.bt-slide-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Scale in */
.bt-scale-in {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.34,1.56,0.64,1);
}
.bt-scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* =============================
   15. FEATURED CONTENT WIDGET
   ============================= */
.featured-content .entry {
  border-bottom: 1px solid var(--color-border) !important;
  margin-bottom: 20px !important;
  padding: 16px 0;
  background: transparent;
  box-shadow: none;
  border-radius: 0;
}

.featured-content .entry:hover {
  transform: none;
  box-shadow: none;
}

.featured-content .entry-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.featured-content .entry-title a {
  color: var(--color-text) !important;
  background: none;
  font-weight: 600;
}

.featured-content .entry-title a:hover {
  color: var(--color-primary) !important;
}

/* =============================
   16. READING PROGRESS BAR
   ============================= */
#bt-reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-brand);
  z-index: 9999;
  transition: width 0.1s linear;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

/* =============================
   17. BACK TO TOP BUTTON
   ============================= */
#bt-back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-brand);
  opacity: 0;
  transform: translateY(16px) scale(0.8);
  transition: opacity var(--transition-normal),
              transform var(--transition-spring),
              box-shadow var(--transition-fast);
  z-index: 1000;
  color: #fff;
  font-size: 18px;
  text-decoration: none;
}

#bt-back-to-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

#bt-back-to-top:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px) scale(1.05);
}

/* =============================
   18. SELECTION STYLE
   ============================= */
::selection {
  background: rgba(27,108,168,.2);
  color: var(--color-text);
}

/* =============================
   19. SCROLLBAR (Webkit)
   ============================= */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-primary-light), var(--color-accent));
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* =============================
   20. FOCUS STYLES (a11y)
   ============================= */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 3px;
}

/* =============================
   21. TAG CLOUD
   ============================= */
.sidebar .tagcloud a,
.sidebar .tagcloud a:visited {
  background: var(--color-surface-2) !important;
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-full) !important;
  color: var(--color-text) !important;
  font-family: var(--font-main) !important;
  font-size: 12px !important;
  font-weight: 500;
  padding: 5px 14px !important;
  transition: all var(--transition-fast) !important;
}

.sidebar .tagcloud a:hover {
  background: var(--gradient-brand) !important;
  border-color: transparent !important;
  color: #fff !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-brand);
}

/* =============================
   22. TABLE STYLING
   ============================= */
.entry-content table {
  border-collapse: collapse;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.entry-content th {
  background: var(--gradient-brand);
  color: #fff;
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 12px 16px;
}

.entry-content td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.entry-content tr:nth-child(even) td {
  background: var(--color-surface-2);
}

.entry-content tr:hover td {
  background: rgba(27,108,168,.04);
}

/* =============================
   23. SKIP LINK (accessibility)
   ============================= */
.genesis-skip-link a:focus {
  background: var(--color-primary) !important;
  color: #fff !important;
  border-radius: var(--radius-sm);
}

/* =============================
   24. COMMENT SECTION
   ============================= */
.comment-respond,
.entry-comments {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

li.comment {
  background: var(--color-surface-2) !important;
  border: 1px solid var(--color-border) !important;
  border-radius: var(--radius-md) !important;
  margin-top: 16px !important;
  padding: 24px !important;
}

.comment-respond input[type="text"],
.comment-respond input[type="email"],
.comment-respond input[type="url"],
.comment-respond textarea {
  border: 2px solid var(--color-border) !important;
  border-radius: var(--radius-md) !important;
  font-family: var(--font-main) !important;
  padding: 12px 16px !important;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast) !important;
}

.comment-respond input:focus,
.comment-respond textarea:focus {
  border-color: var(--color-primary) !important;
  box-shadow: 0 0 0 3px rgba(27,108,168,.12) !important;
  outline: none !important;
}

/* =============================
   25. SITE INNER PADDING
   ============================= */
.site-inner {
  padding-top: 48px !important;
}

/* =============================
   26. MOBILE RESPONSIVE TWEAKS
   ============================= */
@media (max-width: 840px) {
  :root {
    --space-xl: 24px;
    --space-2xl: 40px;
  }

  .site-header, .site-footer, .site-inner,
  .nav-primary .wrap {
    padding-left: 16px !important;
    padding-right: 16px !important;
  }

  .entry {
    padding: 20px;
    border-radius: var(--radius-md);
  }

  .sidebar .widget {
    border-radius: var(--radius-md);
  }

  #bt-back-to-top {
    bottom: 20px;
    right: 16px;
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .entry-title { font-size: 20px; }
  .entry { padding: 16px; }
}

/* =============================
   27. PRINT STYLES
   ============================= */
@media print {
  .nav-primary, .sidebar, .footer-widgets,
  .site-footer, #bt-back-to-top, #bt-reading-progress {
    display: none !important;
  }
  .content { width: 100% !important; float: none !important; }
}

/* =============================
   28. SMOOTH PAGE LOAD
   ============================= */
@keyframes bt-page-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.site-container {
  animation: bt-page-in 0.4s ease forwards;
}

/* Loading shimmer for images */
@keyframes bt-shimmer {
  0%   { background-position: -600px 0; }
  100% { background-position: 600px 0; }
}

img.lazyload {
  background: linear-gradient(90deg, #f0f4f8 25%, #e2e8f0 50%, #f0f4f8 75%);
  background-size: 600px 100%;
  animation: bt-shimmer 1.5s infinite linear;
}

/* =============================
   29. SPECIAL HEADINGS IN SIDEBAR
   ============================= */
.sidebar .enews .widget-title {
  background: var(--gradient-brand) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  background-clip: text !important;
  padding: 0 !important;
}

/* =============================
   30. HOVER CARD GLOW EFFECT
   ============================= */
.entry::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: -1;
  filter: blur(20px);
}

.entry {
  position: relative;
  isolation: isolate;
}

.entry:hover::before {
  opacity: 0.1;
}