/*
Theme Name: B10logy Modern
Theme URI: https://b10logy.com
Author: B10logy
Author URI: https://b10logy.com
Description: A modern, high-performance, and visually captivating life sciences educational theme for B10logy.com. Featuring glassmorphism, responsive biological card layouts, live search, dark mode, and enhanced scientific typography.
Version: 1.0.0
Requires at least: 5.8
Tested up to: 7.1
Requires PHP: 7.4
License: GNU General Public License v2 or later
Tags: education, science, biology, responsive, custom-colors, dark-mode, grid-layout
Text Domain: b10logy-modern
*/

:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Outfit', 'Plus Jakarta Sans', -apple-system, sans-serif;
  --font-mono: 'Fira Code', monospace;

  /* Primary Biological Colors */
  --color-primary: #0EA5E9;
  --color-primary-hover: #0284C7;
  --color-primary-light: #E0F2FE;
  --color-secondary: #10B981;
  --color-secondary-hover: #059669;
  --color-secondary-light: #D1FAE5;
  --color-accent: #06B6D4;
  --color-accent-purple: #8B5CF6;

  /* Neutral Spectrum - Light Theme */
  --bg-body: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAFC;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-strong: rgba(255, 255, 255, 0.95);
  --bg-muted: #F1F5F9;
  --border-color: #E2E8F0;
  --border-glass: rgba(226, 232, 240, 0.8);
  --border-hover: #BAE6FD;

  /* Text Colors */
  --text-main: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --text-inverse: #FFFFFF;

  /* Shadows & Glow */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 20px 25px -5px rgba(14, 165, 233, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 25px rgba(14, 165, 233, 0.2);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Theme Overrides */
[data-theme="dark"] {
  --bg-body: #070D1E;
  --bg-surface: #0E172F;
  --bg-card: #111C38;
  --bg-card-hover: #162447;
  --bg-glass: rgba(14, 23, 47, 0.85);
  --bg-glass-strong: rgba(14, 23, 47, 0.95);
  --bg-muted: #1A284C;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(14, 165, 233, 0.35);

  --text-main: #F8FAFC;
  --text-secondary: #E2E8F0;
  --text-muted: #94A3B8;
  --text-light: #64748B;
  --color-primary-light: rgba(14, 165, 233, 0.15);
  --color-secondary-light: rgba(16, 185, 129, 0.15);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.6);
  --shadow-hover: 0 20px 30px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 35px rgba(14, 165, 233, 0.3);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.65;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Layout Utilities */
.b10-container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.b10-container-sm {
  width: 100%;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Top Notification Bar */
.b10-topbar {
  background: linear-gradient(90deg, #0284C7 0%, #0D9488 50%, #10B981 100%);
  color: #FFFFFF;
  font-size: 0.8125rem;
  font-weight: 600;
  text-align: center;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.b10-topbar a {
  color: #FFFFFF;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.b10-topbar a:hover {
  opacity: 0.9;
}

/* Header & Glass Navigation */
.b10-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-glass);
  transition: var(--transition);
}

.b10-header.scrolled {
  box-shadow: var(--shadow-md);
  background-color: var(--bg-glass-strong);
}

.b10-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  gap: 1.5rem;
}

/* Brand Logo */
.b10-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.b10-brand img {
  height: 42px;
  width: auto;
  object-fit: contain;
}

.b10-brand-text {
  display: flex;
  flex-direction: column;
}

.b10-brand-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #0284C7 0%, #10B981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.b10-brand-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* Navigation Links */
.b10-nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.b10-nav-item {
  position: relative;
}

.b10-nav-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 0.9rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.b10-nav-link:hover,
.b10-nav-item.active .b10-nav-link {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.b10-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  width: 260px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.75rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 100;
  list-style: none;
}

.b10-nav-item:hover .b10-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.b10-dropdown-item a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}

.b10-dropdown-item a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* Mega-Dropdown for Disciplines */
.b10-mega-dropdown {
  width: 580px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  padding: 1rem;
}

/* Nav Actions (Search, Theme Toggle, Mobile Button) */
.b10-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.b10-search-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.b10-search-btn:hover {
  border-color: var(--color-primary);
  color: var(--text-main);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.b10-search-btn kbd {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.6875rem;
  padding: 0.15rem 0.35rem;
  font-family: var(--font-mono);
}

.b10-theme-btn {
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.b10-theme-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.b10-mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  padding: 0.5rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

/* Hero Section */
.b10-hero {
  position: relative;
  padding: 4.5rem 0 3.5rem;
  background: radial-gradient(ellipse at 50% 10%, rgba(14, 165, 233, 0.12) 0%, rgba(16, 185, 129, 0.05) 50%, transparent 80%);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.b10-hero-content {
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

/* Graphical Hero Split Layout */
.b10-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 3.5rem;
  text-align: left;
}

@media (max-width: 992px) {
  .b10-hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2.5rem;
  }
}

.b10-hero-text {
  text-align: left;
}

@media (max-width: 992px) {
  .b10-hero-text {
    text-align: center;
  }
  .b10-hero-text .b10-hero-search {
    margin-left: auto;
    margin-right: auto;
  }
  .b10-hero-text .b10-quick-pills {
    justify-content: center;
  }
}

/* Hero Graphical Showcase Visual */
.b10-hero-visual-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: var(--transition);
}

.b10-hero-visual-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 20px 45px -10px rgba(14, 165, 233, 0.25);
}

.b10-hero-graphic-wrap {
  width: 100%;
  position: relative;
}

.b10-hero-graphic-wrap svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Floating Badges on Hero Graphic */
.b10-floating-badge {
  position: absolute;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  box-shadow: var(--shadow-md);
  z-index: 2;
  animation: b10-float 4s ease-in-out infinite alternate;
}

.b10-floating-badge-1 {
  top: -12px;
  right: -10px;
  color: var(--color-primary);
  border-color: rgba(14, 165, 233, 0.4);
}

.b10-floating-badge-2 {
  bottom: -15px;
  left: 10px;
  color: var(--color-secondary);
  border-color: rgba(16, 185, 129, 0.4);
  animation-delay: -2s;
}

@keyframes b10-float {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-8px); }
}

/* Graphical Chapter Chips */
.b10-chapter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.85rem 0 1.25rem;
}

.b10-chapter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.b10-chapter-chip:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Unit Header with Icon Box */
.b10-unit-header-flex {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.b10-unit-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

/* Graphical Metrics Cards */
.b10-stat-card-visual {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.b10-stat-card-visual:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.b10-stat-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.b10-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid rgba(14, 165, 233, 0.3);
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

[data-theme="dark"] .b10-pill-badge {
  color: #38BDF8;
}

.b10-hero-title {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.b10-hero-title span {
  background: linear-gradient(135deg, #0284C7 0%, #059669 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.b10-hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Hero Search & Instant Filter */
.b10-hero-search {
  max-width: 640px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.b10-search-input-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 0.4rem 0.6rem 0.4rem 1.25rem;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.b10-search-input-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.b10-search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text-main);
  outline: none;
  padding: 0.5rem 0;
}

.b10-search-input::placeholder {
  color: var(--text-light);
}

.b10-search-submit {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #FFFFFF;
  border: none;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.b10-search-submit:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

/* Quick Topic Pills */
.b10-quick-pills {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.b10-quick-pill {
  background: var(--bg-muted);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-weight: 500;
  transition: var(--transition);
}

.b10-quick-pill:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Key Metrics Strip */
.b10-stats-strip {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-surface);
}

.b10-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.b10-stat-item {
  padding: 0.5rem;
}

.b10-stat-num {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.b10-stat-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Section Headings */
.b10-section {
  padding: 4.5rem 0;
}

.b10-section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem;
}

.b10-section-tag {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  display: inline-block;
}

.b10-section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.b10-section-desc {
  font-size: 1rem;
  color: var(--text-muted);
}

/* Curriculum Fast-Track Grid (Class 11 & 12) */
.b10-curriculum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.b10-unit-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.b10-unit-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  opacity: 0;
  transition: var(--transition);
}

.b10-unit-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-hover);
}

.b10-unit-card:hover::before {
  opacity: 1;
}

.b10-unit-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  align-self: flex-start;
}

.b10-unit-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.b10-unit-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.b10-unit-chapters {
  list-style: none;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  margin-bottom: 1.25rem;
}

.b10-unit-chapters li {
  font-size: 0.8125rem;
  padding: 0.35rem 0;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.b10-unit-chapters li::before {
  content: "•";
  color: var(--color-secondary);
  font-size: 1.2rem;
  line-height: 0;
}

.b10-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  text-decoration: none;
}

.b10-btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #FFFFFF;
}

.b10-btn-primary:hover {
  opacity: 0.95;
  color: #FFFFFF;
  box-shadow: var(--shadow-md);
}

.b10-btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.b10-btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* 16 Specialized Disciplines Grid */
.b10-disciplines-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.5rem;
}

.b10-discipline-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.b10-discipline-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}

.b10-discipline-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  transition: var(--transition);
}

.b10-discipline-card:hover .b10-discipline-icon-wrap {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #FFFFFF;
}

.b10-discipline-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.b10-discipline-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.b10-discipline-link {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.b10-discipline-link:hover {
  gap: 0.6rem;
}

/* MCQ Test Hub Section */
.b10-mcq-section {
  background: linear-gradient(180deg, var(--bg-body) 0%, var(--bg-muted) 100%);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.b10-mcq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.b10-mcq-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.b10-mcq-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-secondary);
}

.b10-mcq-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-secondary);
  background: var(--color-secondary-light);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-bottom: 0.75rem;
}

.b10-mcq-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.b10-mcq-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

/* Interactive Topic Directory / Filterable Index */
.b10-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.b10-filter-tab {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.b10-filter-tab.active,
.b10-filter-tab:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
}

.b10-topics-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.b10-topic-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.b10-topic-item:hover {
  border-color: var(--color-primary);
  transform: translateX(4px);
  background-color: var(--color-primary-light);
}

.b10-topic-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-main);
}

.b10-topic-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Features / Why B10logy */
.b10-features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.b10-feature-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  text-align: left;
}

.b10-feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-secondary-light);
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.b10-feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.b10-feature-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Inner Single / Page Styles */
.b10-article-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2.5rem;
  background: radial-gradient(ellipse at 50% 0%, rgba(14, 165, 233, 0.08) 0%, transparent 70%);
}

.b10-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.b10-breadcrumbs a {
  color: var(--text-secondary);
}

.b10-breadcrumbs a:hover {
  color: var(--color-primary);
}

.b10-breadcrumbs-sep {
  color: var(--text-light);
}

.b10-article-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.b10-article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.b10-meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Article Content Typography Enhancements */
.b10-content-wrap {
  padding-bottom: 4rem;
}

.b10-content {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.b10-content h2 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  color: var(--text-main);
}

.b10-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.b10-content p {
  margin-bottom: 1.5rem;
}

.b10-content ul,
.b10-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.b10-content li {
  margin-bottom: 0.5rem;
}

.b10-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.5rem;
  background-color: var(--bg-muted);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  margin: 1.5rem 0;
  color: var(--text-main);
}

.b10-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.9375rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.b10-content th {
  background-color: var(--bg-muted);
  color: var(--text-main);
  font-weight: 700;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.b10-content td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.b10-content tr:last-child td {
  border-bottom: none;
}

/* Child Topics Grid in Pages */
.b10-subtopics-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px solid var(--border-color);
}

.b10-subtopics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.b10-subtopic-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
}

.b10-subtopic-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.b10-subtopic-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
}

/* Modal Search Overlay */
.b10-search-modal {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 5rem 1rem 2rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.b10-search-modal.active {
  opacity: 1;
  visibility: visible;
}

.b10-search-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(-20px);
  transition: var(--transition);
}

.b10-search-modal.active .b10-search-dialog {
  transform: translateY(0);
}

.b10-modal-header {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  gap: 0.75rem;
}

.b10-modal-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1.15rem;
  color: var(--text-main);
  outline: none;
}

.b10-modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
}

.b10-modal-results {
  max-height: 420px;
  overflow-y: auto;
  padding: 0.5rem;
}

.b10-modal-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition);
}

.b10-modal-result-item:hover,
.b10-modal-result-item.highlighted {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* Footer */
.b10-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
}

.b10-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.b10-footer-brand {
  max-width: 320px;
}

.b10-footer-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 1rem;
  line-height: 1.6;
}

.b10-footer-col h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.b10-footer-links {
  list-style: none;
}

.b10-footer-links li {
  margin-bottom: 0.65rem;
}

.b10-footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.b10-footer-links a:hover {
  color: var(--color-primary);
  transform: translateX(3px);
  display: inline-block;
}

.b10-footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.b10-back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
}

.b10-back-to-top:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Mobile Drawer */
.b10-mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 1500;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.b10-mobile-drawer.active {
  opacity: 1;
  visibility: visible;
}

.b10-drawer-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 85%;
  max-width: 360px;
  background-color: var(--bg-surface);
  box-shadow: var(--shadow-lg);
  padding: 2rem 1.5rem;
  transform: translateX(100%);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.b10-mobile-drawer.active .b10-drawer-panel {
  transform: translateX(0);
}

.b10-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.b10-drawer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.b10-drawer-link {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  padding: 0.5rem 0;
  display: block;
  border-bottom: 1px solid var(--border-color);
}

/* Elementor Compatibility Layer */
.elementor {
  color: inherit !important;
}

.elementor h1, .elementor h2, .elementor h3, .elementor h4, .elementor h5 {
  font-family: var(--font-heading) !important;
  color: var(--text-main) !important;
}

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

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

.elementor-widget-heading .elementor-heading-title a {
  color: var(--text-main) !important;
}

.elementor-widget-heading .elementor-heading-title a:hover {
  color: var(--color-primary) !important;
}

/* ==========================================================================
   Responsive Media Queries (Mobile & Tablet Optimization)
   ========================================================================== */

/* ==========================================================================
   Responsive Media Queries (Mobile & Tablet Optimization)
   ========================================================================== */

/* 1. Large Tablets & Small Laptops (<= 1024px) */
@media (max-width: 1024px) {
  .b10-footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  .b10-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .b10-disciplines-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.25rem;
  }
  .b10-scale-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
  .b10-pathways-showcase-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

/* 2. Tablets in Portrait & iPad Displays (<= 992px) */
@media (max-width: 992px) {
  .b10-nav-menu {
    display: none !important;
  }
  .b10-mobile-toggle {
    display: flex !important;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
  }
  .b10-hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2.25rem;
  }
  .b10-hero-text {
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
  }
  .b10-hero-search {
    margin: 0 auto 1.5rem;
    max-width: 540px;
    width: 100%;
  }
  .b10-quick-pills {
    justify-content: center;
  }
  .b10-hero-visual-card {
    max-width: 520px;
    margin: 0 auto;
    padding: 1.25rem;
    width: 100%;
  }
  .b10-pillar-switcher-nav {
    gap: 0.5rem;
    justify-content: center;
  }
  .b10-pillar-tab-btn {
    padding: 0.55rem 1rem;
    font-size: 0.875rem;
  }
  .b10-disciplines-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

/* 3. Small Tablets & Large Phones (<= 768px) */
@media (max-width: 768px) {
  .b10-container,
  .b10-container-sm {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .b10-topbar {
    font-size: 0.75rem;
    padding: 0.4rem 0.75rem;
    flex-direction: column;
    gap: 0.25rem;
    text-align: center;
  }
  .b10-hero {
    padding: 2.75rem 0 2rem;
  }
  .b10-scale-strip {
    padding: 3rem 0 2.5rem;
  }
  .b10-scale-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  .b10-scale-card {
    padding: 1.15rem 0.85rem;
  }
  .b10-scale-icon-wrap {
    width: 38px;
    height: 38px;
    font-size: 1.2rem;
  }
  .b10-scale-level {
    font-size: 1rem;
  }
  .b10-pillar-switcher-nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    width: 100%;
    max-width: 480px;
    margin: 1.5rem auto 2rem;
  }
  .b10-pillar-tab-btn {
    width: 100%;
    justify-content: center;
    padding: 0.65rem 0.5rem;
    font-size: 0.8125rem;
    text-align: center;
    border-radius: var(--radius-md);
  }
  .b10-pillar-tab-btn .badge {
    display: none;
  }
  .b10-disciplines-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .b10-discipline-card {
    padding: 1.25rem 1rem;
  }
  .b10-pathways-showcase-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .b10-pathway-showcase-card {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }
  .b10-pathway-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
  .b10-pathway-card-title {
    font-size: 1.15rem;
  }
  .b10-pathway-card-sub {
    font-size: 0.75rem;
  }
  .b10-pathway-card-svg {
    padding: 0.75rem 0.5rem;
    margin: 0.5rem 0 1rem;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .b10-pathway-card-svg svg {
    min-width: 280px;
    width: 100%;
    height: auto;
  }
  .b10-pathway-key-concepts {
    gap: 0.3rem;
    margin-bottom: 1rem;
  }
  .b10-pathway-key-pill {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
  }
  .b10-pathway-card-btn {
    padding: 0.65rem 1rem;
    font-size: 0.8125rem;
    min-height: 40px;
  }
  .b10-filter-bar {
    display: flex;
    overflow-x: auto;
    justify-content: flex-start;
    padding: 0.25rem 0 0.75rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    flex-wrap: nowrap;
    gap: 0.4rem;
  }
  .b10-filter-bar::-webkit-scrollbar {
    display: none;
  }
  .b10-filter-tab {
    white-space: nowrap;
    flex-shrink: 0;
    padding: 0.45rem 0.85rem;
    font-size: 0.8125rem;
    min-height: 36px;
  }
  .b10-topics-list {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }
  .b10-topic-item {
    padding: 0.75rem 0.9rem;
    min-height: 44px;
  }
  .b10-topic-name {
    font-size: 0.875rem;
  }
  .b10-topic-badge {
    font-size: 0.6875rem;
    padding: 0.15rem 0.45rem;
  }
  .b10-content table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-sm);
  }
  .b10-diagram-container {
    padding: 1.15rem 0.85rem;
    margin: 1.5rem 0;
  }
  .b10-pathway-steps {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  .b10-curriculum-bridge {
    padding: 2rem 1.25rem;
    margin-top: 2.5rem;
    margin-bottom: 2.5rem;
  }
  .b10-curriculum-bridge-title {
    font-size: 1.5rem;
  }
  .b10-footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .b10-footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* 4. Mobile Phones (<= 640px) */
@media (max-width: 640px) {
  .b10-nav-inner {
    height: 3.75rem;
  }
  .b10-brand img {
    height: 32px;
    width: auto;
  }
  .b10-search-btn span,
  .b10-search-btn kbd {
    display: none;
  }
  .b10-search-btn {
    width: 38px;
    height: 38px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .b10-theme-btn {
    width: 38px;
    height: 38px;
  }
  .b10-stats-grid {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
  .b10-hero-visual-card {
    padding: 1rem 0.75rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
  }
  .b10-floating-badge {
    display: none; /* Inset clean mobile view to eliminate any horizontal overflow risk */
  }
  .b10-search-modal {
    padding: 2rem 0.75rem 1rem;
  }
  .b10-article-title {
    font-size: clamp(1.65rem, 5.5vw, 2.25rem);
  }
  .b10-article-header {
    padding: 2rem 0 1.25rem;
  }
  .b10-section {
    padding: 2.75rem 0;
  }
  .b10-section-title {
    font-size: 1.65rem;
  }
}

/* 5. Compact Mobile Phones (<= 480px) */
@media (max-width: 480px) {
  .b10-container,
  .b10-container-sm {
    padding-left: 0.875rem;
    padding-right: 0.875rem;
  }
  .b10-hero-title {
    font-size: clamp(1.5rem, 6.5vw, 1.95rem);
  }
  .b10-hero-subtitle {
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
  }
  .b10-search-input-wrap {
    padding: 0.3rem 0.35rem 0.3rem 0.75rem;
    width: 100%;
  }
  .b10-search-input {
    font-size: 0.8125rem;
    min-width: 0;
  }
  .b10-search-submit {
    padding: 0.5rem 0.85rem;
    font-size: 0.775rem;
    flex-shrink: 0;
  }
  .b10-scale-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  .b10-discipline-card,
  .b10-subject-card {
    padding: 1.15rem 0.85rem;
  }
  .b10-chapter-chips {
    gap: 0.25rem;
  }
  .b10-chapter-chip {
    font-size: 0.7rem;
    padding: 0.2rem 0.45rem;
  }
  .b10-quick-pills {
    gap: 0.3rem;
  }
  .b10-quick-pill {
    padding: 0.25rem 0.55rem;
    font-size: 0.725rem;
    min-height: 30px;
    display: inline-flex;
    align-items: center;
  }
  .b10-subjects-filter-btn {
    padding: 0.35rem 0.75rem;
    font-size: 0.775rem;
  }
}

/* 6. Ultra-Compact Mobile Phones (<= 380px) */
@media (max-width: 380px) {
  .b10-pillar-switcher-nav {
    grid-template-columns: 1fr;
  }
  .b10-search-submit span {
    display: none; /* Icon only to prevent text squishing on 320px screens */
  }
  .b10-hero-title {
    font-size: 1.45rem;
  }
}

/* ==========================================================================
   Subjects Directory Page Styles
   ========================================================================== */
.b10-subjects-hero {
  padding: 3.5rem 0 2.5rem;
  background: radial-gradient(ellipse at 50% 0%, rgba(14, 165, 233, 0.12) 0%, rgba(16, 185, 129, 0.05) 60%, transparent 80%);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.b10-subjects-hero-content {
  max-width: 820px;
  margin: 0 auto;
}

.b10-subjects-search-wrap {
  max-width: 600px;
  margin: 1.75rem auto 1.25rem;
  position: relative;
}

.b10-subjects-filter-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.b10-subjects-filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.45rem 1.15rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.b10-subjects-filter-btn:hover,
.b10-subjects-filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.25);
}

.b10-subjects-filter-btn .count-badge {
  background: rgba(0, 0, 0, 0.08);
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
}

.b10-subjects-filter-btn.active .count-badge {
  background: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

/* Category Sections */
.b10-category-section {
  margin-bottom: 3.5rem;
  transition: var(--transition);
}

.b10-category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.b10-category-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.b10-category-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  background: var(--color-primary-light);
}

.b10-category-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0;
}

.b10-category-pill {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Enhanced Subject Cards */
.b10-subject-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  height: 100%;
}

.b10-subject-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  opacity: 0;
  transition: var(--transition);
}

.b10-subject-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}

.b10-subject-card:hover::before {
  opacity: 1;
}

.b10-subject-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.b10-subject-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  transition: var(--transition);
}

.b10-subject-card:hover .b10-subject-icon {
  transform: scale(1.08);
}

.b10-subject-badges {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
}

.b10-subject-count-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.b10-subject-category-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
}

.b10-subject-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 0.6rem;
  color: var(--text-main);
}

.b10-subject-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.b10-subject-topics-wrap {
  border-top: 1px solid var(--border-color);
  padding-top: 0.85rem;
  margin-bottom: 1.25rem;
}

.b10-subject-topics-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-light);
  letter-spacing: 0.05em;
  margin-bottom: 0.45rem;
}

.b10-subject-topics-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.b10-topic-chip {
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--bg-muted);
  color: var(--text-secondary);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.b10-subject-card:hover .b10-topic-chip {
  border-color: var(--color-primary);
}

.b10-subject-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  background: var(--bg-muted);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.b10-subject-card:hover .b10-subject-btn {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

/* Synergy Box */
.b10-curriculum-bridge {
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-muted) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  margin-top: 4rem;
  margin-bottom: 4rem;
  box-shadow: var(--shadow-sm);
}

.b10-curriculum-bridge-title {
  font-size: 1.85rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.b10-curriculum-bridge-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.b10-curriculum-bridge-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   High-Yield Scientific Notes & Pictorial Content Styles
   ========================================================================== */
.b10-note-box {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(16, 185, 129, 0.05) 100%);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
}

.b10-note-box-title {
  font-size: 0.9375rem;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.b10-note-box p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

/* Labeled Diagram Containers */
.b10-diagram-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 2.25rem 0;
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
}

.b10-diagram-container:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.b10-diagram-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.b10-diagram-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}

.b10-diagram-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-secondary);
  background: var(--color-secondary-light);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
}

.b10-diagram-svg-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  margin: 0 auto;
  padding: 0.5rem 0;
}

.b10-diagram-svg-wrap svg {
  max-width: 100%;
  height: auto;
  display: inline-block;
}

.b10-diagram-caption {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  font-style: italic;
}

/* Pathway Steps */
.b10-pathway-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.75rem 0;
}

.b10-pathway-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  position: relative;
}

.b10-step-num {
  font-size: 0.6875rem;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.b10-step-title {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.b10-step-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
}

/* High-Yield Exam Tip */
.b10-exam-tip {
  background: rgba(245, 158, 11, 0.08);
  border-left: 4px solid #F59E0B;
  border-radius: var(--radius-md);
  padding: 1.15rem 1.4rem;
  margin: 1.75rem 0;
}

.b10-exam-tip-title {
  font-size: 0.875rem;
  font-weight: 800;
  color: #D97706;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.b10-exam-tip p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Checkpoint Quiz Box */
.b10-checkpoint-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 2.5rem 0;
}

.b10-checkpoint-header {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.b10-checkpoint-q {
  background: var(--bg-muted);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
}

.b10-checkpoint-q strong {
  color: var(--color-primary);
}

/* ==========================================================================
   Homepage Redesign: Biological Hierarchy & Scale of Life Explorer
   ========================================================================== */
.b10-scale-strip {
  padding: 4rem 0 3.5rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.b10-scale-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

@media (max-width: 1024px) {
  .b10-scale-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .b10-scale-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .b10-scale-grid {
    grid-template-columns: 1fr;
  }
}

.b10-scale-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}

.b10-scale-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-hover);
}

.b10-scale-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  color: var(--color-primary);
  border: 1px solid var(--border-color);
  align-self: flex-start;
  margin-bottom: 0.85rem;
}

.b10-scale-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 0.85rem;
}

.b10-scale-level {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.b10-scale-sub {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.b10-scale-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color);
}

.b10-scale-tag {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-muted);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Homepage Redesign: Interactive Pillar Switcher
   ========================================================================== */
.b10-pillar-switcher-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 2rem 0 2.5rem;
}

.b10-pillar-tab-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-sm);
}

.b10-pillar-tab-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.b10-pillar-tab-btn.active {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0284C7 100%);
  border-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(14, 165, 233, 0.35);
}

.b10-pillar-tab-btn .badge {
  font-size: 0.6875rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.08);
}

.b10-pillar-tab-btn.active .badge {
  background: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

.b10-pillar-panel {
  display: none;
  animation: b10-fade-in 0.35s ease forwards;
}

.b10-pillar-panel.active {
  display: block;
}

@keyframes b10-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   Homepage Redesign: Featured Vector Pathways Showcase
   ========================================================================== */
.b10-pathways-showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

@media (max-width: 900px) {
  .b10-pathways-showcase-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.b10-pathway-showcase-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.b10-pathway-showcase-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.b10-pathway-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.b10-pathway-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.b10-pathway-card-sub {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
}

.b10-pathway-card-svg {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin: 0.75rem 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
}

.b10-pathway-card-svg svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.b10-pathway-key-concepts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.b10-pathway-key-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--bg-muted);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.b10-pathway-card-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.75rem 1.25rem;
  background: var(--bg-muted);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  margin-top: auto;
}

.b10-pathway-showcase-card:hover .b10-pathway-card-btn {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}