/* NEET Study Atlas — Production Editorial Design System */
/* Inspired by reference publications, university curricula, and scholarly textbooks */

:root {
  --color-primary: #183F35;         /* Deep Forest Green */
  --color-primary-dark: #0F2A23;    /* Scholarly Dark Green */
  --color-primary-light: #245A4C;   /* Mid Forest */
  --color-accent: #C97936;          /* Restrained Warm Ochre Accent */
  --color-accent-hover: #AF6427;    /* Deeper Accent */
  --color-text-main: #202722;       /* Near-black readable ink */
  --color-text-muted: #59655E;      /* Editorial secondary text (WCAG AA compliant > 4.5:1) */
  --color-bg-main: #FAF9F5;         /* Warm paper background */
  --color-surface: #FFFFFF;         /* Crisp white content surface */
  --color-surface-soft: #EEF3EC;    /* Soft sage green section */
  --color-surface-hover: #F2F4EF;   /* Subtle row hover */
  --color-border: #E4E6DF;          /* Thin textbook border */
  --color-border-dark: #CBD0C5;     /* Prominent border */
  --color-success: #236B4D;
  --color-warning: #945B1E;
  --color-error: #962828;
  
  --font-serif: "Newsreader", "Charter", "Georgia", "Cambria", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-devanagari: "Noto Sans Devanagari", "Mangal", "Nirmala UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, Menlo, monospace;
  
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  
  --shadow-subtle: 0 1px 3px rgba(32, 39, 34, 0.04);
  --shadow-card: 0 2px 8px rgba(32, 39, 34, 0.06);
  --shadow-hover: 0 4px 14px rgba(32, 39, 34, 0.09);
  
  --container-max: 1200px;
  --article-max: 820px;
  --header-height: 72px;
}

/* Reset & Base */
*, *::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(--color-bg-main);
  color: var(--color-text-main);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Hindi Devanagari Typography Adaptation */
:lang(hi), .hindi-text {
  font-family: var(--font-devanagari), var(--font-sans);
  line-height: 1.8;
}

/* Accessibility: Skip Link & Focus */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 10px 18px;
  z-index: 9999;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
  text-decoration: none;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid var(--color-accent);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary-dark);
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.25;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
}

h1 {
  font-size: 2.35rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.3em;
}

h3 {
  font-size: 1.35rem;
}

h4 {
  font-size: 1.15rem;
}

p {
  margin-bottom: 1.2em;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--color-accent);
}

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

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-surface-soft);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: var(--color-primary-dark);
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.article-container {
  max-width: var(--article-max);
  margin: 0 auto;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-identity {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-primary-dark);
}

.brand-logo {
  height: 52px;
  width: auto;
  max-width: 190px;
  object-fit: contain;
  display: block;
}

.footer-brand-logo {
  height: 48px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  display: block;
}

.brand-emblem {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-primary);
}

.brand-subtitle {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-main);
  font-weight: 500;
  font-size: 0.94rem;
  padding: 6px 4px;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
}
.lang-toggle-btn:hover {
  background: var(--color-border);
  color: var(--color-primary-dark);
}

.header-search-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  text-decoration: none;
}
.header-search-link:hover {
  background: var(--color-border);
}

/* Mobile Navigation Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--color-primary-dark);
}

/* Hero Section */
.hero-editorial {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg-main) 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 56px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-surface-soft);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.hero-title {
  font-size: 2.75rem;
  color: var(--color-primary-dark);
  line-height: 1.18;
  margin-top: 0;
  margin-bottom: 18px;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 28px;
}

.hero-search-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  padding: 6px;
  display: flex;
  align-items: center;
  box-shadow: var(--shadow-subtle);
  margin-bottom: 24px;
}

.hero-search-input {
  flex: 1;
  border: none;
  padding: 10px 14px;
  font-size: 0.98rem;
  font-family: inherit;
  color: var(--color-text-main);
  background: transparent;
}
.hero-search-input:focus {
  outline: none;
}

.hero-search-btn {
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-weight: 600;
  font-size: 0.94rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s ease;
}
.hero-search-btn:hover {
  background: var(--color-primary-dark);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.94rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  border: 1px solid var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #FFFFFF;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-border-dark);
}
.btn-secondary:hover {
  background: var(--color-surface-soft);
  color: var(--color-primary-dark);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

/* Hero Quick Fact Card */
.hero-fact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.fact-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.fact-card-title {
  font-size: 1.05rem;
  font-family: var(--font-serif);
  color: var(--color-primary);
  margin: 0;
}

.verified-pill {
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-success);
  background: #EAF4EE;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid #C4E2CF;
}

.fact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.92rem;
}

.fact-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 8px;
}

.fact-label {
  color: var(--color-text-muted);
}

.fact-value {
  font-weight: 600;
  color: var(--color-text-main);
}

.fact-note {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 14px;
  margin-bottom: 0;
  line-height: 1.45;
}

/* Subject Grid Sections */
.section-editorial {
  padding: 56px 0;
}

.section-editorial.alt-bg {
  background: var(--color-surface-soft);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  margin-bottom: 36px;
}

.section-kicker {
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 6px;
  display: block;
}

.section-title {
  font-size: 1.9rem;
  margin: 0 0 8px;
  border-bottom: none;
  padding: 0;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 680px;
  margin-bottom: 0;
}

/* Card Grids */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* Textbook Subject Cards */
.subject-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
}
.subject-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border-dark);
}

.subject-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 8px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}
.badge-biology { background: #E6F3EE; color: #15573F; border: 1px solid #BFDEC3; }
.badge-physics { background: #EEF4F8; color: #1D5477; border: 1px solid #BED8E9; }
.badge-chemistry { background: #F8F1EB; color: #8F4C1B; border: 1px solid #E5CEBD; }
.badge-strategy { background: #F3F1F8; color: #523E84; border: 1px solid #D5CEE5; }

.subject-card-title {
  font-size: 1.35rem;
  margin: 0 0 8px;
  font-family: var(--font-serif);
}

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

.subject-card-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  flex: 1;
}

.subject-card-stats {
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  margin-top: auto;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Article Cards */
.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border-dark);
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.article-card-title {
  font-size: 1.22rem;
  margin: 0 0 10px;
  font-family: var(--font-serif);
  line-height: 1.35;
}

.article-card-title a {
  text-decoration: none;
  color: var(--color-primary-dark);
}
.article-card-title a:hover {
  color: var(--color-accent);
}

.article-card-excerpt {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  flex: 1;
  line-height: 1.55;
}

.article-card-footer {
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.read-more-link {
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.read-more-link:hover {
  color: var(--color-accent);
}

/* Study Roadmap Component */
.roadmap-timeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  position: relative;
}

.roadmap-step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.step-number {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.02rem;
  font-family: var(--font-serif);
  margin: 0 0 6px;
  color: var(--color-primary-dark);
}

.step-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.45;
  margin-bottom: 12px;
  flex: 1;
}

.step-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

/* Educational Tables */
.data-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.editorial-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
  text-align: left;
}

.editorial-table th {
  background: var(--color-surface-soft);
  color: var(--color-primary-dark);
  font-family: var(--font-serif);
  font-weight: 700;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border-dark);
}

.editorial-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-main);
}

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

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

.editorial-table tr.table-total-row td {
  background: #EAF0E8;
  font-weight: 700;
  border-top: 2px solid var(--color-primary);
}

/* Callouts & Alerts */
.callout {
  padding: 20px 24px;
  border-radius: var(--radius-md);
  margin: 28px 0;
  border-left: 4px solid var(--color-primary);
  background: var(--color-surface-soft);
}

.callout-info {
  border-left-color: #2D6A8E;
  background: #EDF4F8;
}

.callout-warning {
  border-left-color: var(--color-accent);
  background: #FAF3EC;
}

.callout p:last-child {
  margin-bottom: 0;
}

/* Article Reading View */
.article-header {
  padding: 44px 0 32px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 36px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

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

.article-h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin: 0 0 16px;
  color: var(--color-primary-dark);
}

.article-lead {
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  font-family: var(--font-serif);
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  color: var(--color-text-muted);
}

.meta-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.language-switch-notice {
  background: #FFF8EE;
  border: 1px solid #F1DEC0;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  margin-bottom: 24px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.key-takeaways-box {
  background: #F4F7F2;
  border: 1px solid #D2DEC9;
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 32px 0;
}

.takeaways-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: 12px;
}

.takeaways-list {
  padding-left: 20px;
}
.takeaways-list li {
  margin-bottom: 8px;
}

.article-toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0;
}

.toc-title {
  font-size: 1rem;
  font-family: var(--font-serif);
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.toc-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.92rem;
}

.toc-list a {
  text-decoration: none;
  color: var(--color-primary);
}
.toc-list a:hover {
  text-decoration: underline;
  color: var(--color-accent);
}

.article-body {
  font-size: 1.06rem;
  line-height: 1.75;
  color: var(--color-text-main);
}

.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 1.4em;
}

.article-body li {
  margin-bottom: 0.5em;
}

.article-sources-box {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  margin-top: 48px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.sources-list {
  list-style: none;
  padding: 0;
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.faq-section {
  margin-top: 48px;
  border-top: 1px solid var(--color-border);
  padding-top: 28px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  background: var(--color-surface);
}

.faq-question {
  padding: 16px 20px;
  font-weight: 700;
  font-size: 1.05rem;
  font-family: var(--font-serif);
  color: var(--color-primary-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.faq-question::-webkit-details-marker {
  display: none;
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 0.95rem;
  color: var(--color-text-main);
  line-height: 1.6;
}

/* Tools System Layout */
.tool-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  margin: 32px 0;
  box-shadow: var(--shadow-card);
}

.tool-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 18px;
  margin-bottom: 24px;
}

.tool-title {
  font-size: 1.45rem;
  font-family: var(--font-serif);
  margin: 0 0 6px;
  color: var(--color-primary);
}

.tool-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  color: var(--color-text-main);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(24, 63, 53, 0.12);
}

/* Interactive MCQ Component */
.mcq-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  background: var(--color-surface);
  margin-bottom: 24px;
}

.mcq-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

.mcq-question-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 18px;
  line-height: 1.5;
}

.mcq-options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.mcq-option-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  text-align: left;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text-main);
  cursor: pointer;
  transition: all 0.15s ease;
}
.mcq-option-btn:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-border-dark);
}

.mcq-option-btn.selected {
  border-color: var(--color-primary);
  background: var(--color-surface-soft);
}

.mcq-option-btn.correct {
  background: #E8F5E9;
  border-color: #2E7D32;
  color: #1B5E20;
  font-weight: 600;
}

.mcq-option-btn.incorrect {
  background: #FFEBEE;
  border-color: #C62828;
  color: #B71C1C;
}

.mcq-explanation {
  background: #F8F9F5;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-top: 16px;
  font-size: 0.92rem;
  line-height: 1.6;
}

/* Checklist Chapter Items */
.checklist-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  gap: 12px;
}
.checklist-item:hover {
  background: var(--color-surface-hover);
}

.chapter-info-col {
  flex: 1;
}

.chapter-title {
  font-weight: 600;
  font-size: 0.96rem;
  color: var(--color-text-main);
}

.chapter-sub {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.status-badge-btn {
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-soft);
  color: var(--color-text-main);
  cursor: pointer;
}

.status-not-started { background: #F5F5F5; color: #616161; }
.status-in-progress { background: #FFF8E1; color: #B78103; border-color: #FFE082; }
.status-revised { background: #E8F5E9; color: #2E7D32; border-color: #A5D6A7; }
.status-needs-practice { background: #FFEBEE; color: #C62828; border-color: #FFCDD2; }

/* Site Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  padding: 56px 0 28px;
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1.2fr;
  gap: 36px;
  margin-bottom: 44px;
}

.footer-col-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-top: 0;
  margin-bottom: 16px;
}

.footer-nav-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-nav-list a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.88rem;
}
.footer-nav-list a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.footer-disclaimer-box {
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 24px;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* Search Page & Live Results */
.search-results-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.search-result-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.search-result-item:hover {
  border-color: var(--color-primary);
}

.search-highlight {
  background: #FFF3C4;
  padding: 0 2px;
  border-radius: 2px;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .roadmap-timeline {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .brand-logo {
    height: 44px;
  }
  h1 { font-size: 1.95rem; }
  h2 { font-size: 1.5rem; }
  .hero-title { font-size: 2.15rem; }
  
  .mobile-nav-toggle {
    display: block;
  }
  
  .site-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: 24px;
    overflow-y: auto;
    border-top: 1px solid var(--color-border);
    z-index: 999;
  }
  
  .site-nav.open {
    display: flex;
  }
  
  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 12px;
  }
  
  .nav-links a {
    font-size: 1.1rem;
    padding: 8px 0;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }
  
  .grid-3, .grid-2, .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .roadmap-timeline {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  
  .article-h1 {
    font-size: 1.85rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero-editorial {
    padding: 36px 0 28px;
  }
  .hero-title {
    font-size: 1.75rem;
  }
  .hero-search-box {
    flex-direction: column;
    padding: 4px;
  }
  .hero-search-input {
    width: 100%;
  }
  .hero-search-btn {
    width: 100%;
    justify-content: center;
  }
  .checklist-item {
    flex-direction: column;
    align-items: flex-start;
  }
}