:root {
  color-scheme: light;
  --ink: #18212f;
  --muted: #5d6677;
  --line: #d9e0ea;
  --paper: #ffffff;
  --soft: #f5f7fb;
  --soft-2: #edf6f2;
  --brand: #2758d8;
  --brand-dark: #173783;
  --accent: #21875b;
  --warning: #b95d1b;
  --radius: 8px;
  --shadow: 0 14px 38px rgba(25, 34, 49, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Nirmala UI", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(39, 88, 216, 0.35);
  outline-offset: 3px;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid rgba(255, 255, 255, 0.24);
  color: #fff;
}

.topbar a:not(.brand) {
  font-size: 0.95rem;
  opacity: 0.9;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-right: auto;
  font-weight: 800;
}

.brand::before {
  content: "DV";
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, #2758d8, #21875b);
  font-size: 0.75rem;
  font-weight: 900;
}

.site-hero {
  min-height: 92vh;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(10, 25, 50, 0.94), rgba(17, 79, 81, 0.72)),
    url("assets/images/chapter-48-final-practical-test-visual.svg");
  background-size: cover;
  background-position: center;
}

.hero-content {
  max-width: 760px;
  padding: clamp(4rem, 10vw, 8rem) clamp(1rem, 4vw, 3rem) 5rem;
}

.eyebrow,
.section-label {
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0;
  font-weight: 800;
  color: #2e6ccf;
}

.site-hero .eyebrow {
  color: #cbe2ff;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 5.4rem);
  max-width: 850px;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

h3 {
  font-size: 1.1rem;
}

.hero-subtitle {
  margin: 0.8rem 0 0;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 700;
}

.hero-copy {
  max-width: 680px;
  margin: 1.2rem 0 0;
  font-size: 1.08rem;
  color: #eaf2ff;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.hero-stats span {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  min-height: 42px;
  padding: 0.45rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: var(--radius);
  color: #eaf2ff;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(6px);
}

.hero-stats strong {
  color: #fff;
  font-size: 1.35rem;
}

.hindi-line,
.section-intro {
  margin: 0.8rem 0 0;
  color: var(--muted);
}

.hero-actions,
.chapter-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1rem;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  font-weight: 800;
  color: currentColor;
  background: transparent;
  cursor: pointer;
}

.button.primary {
  border-color: var(--brand);
  color: #fff;
  background: var(--brand);
}

.site-hero .button.primary {
  border-color: #fff;
  color: var(--brand-dark);
  background: #fff;
}

.button.small {
  min-height: 38px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
}

.band,
.content-section {
  padding: clamp(2rem, 5vw, 4.5rem) clamp(1rem, 4vw, 3rem);
}

.band {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 2rem;
  background: var(--soft);
  border-block: 1px solid var(--line);
}

.content-section {
  max-width: 1180px;
  margin: 0 auto;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.module-card,
.content-card,
.image-card,
.test-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.module-card {
  display: grid;
  gap: 0.25rem;
  overflow: hidden;
  padding: 0 0 1rem;
  border-top: 5px solid var(--accent);
  box-shadow: 0 8px 20px rgba(25, 34, 49, 0.06);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.module-card:hover,
.chapter-index a:hover,
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(25, 34, 49, 0.1);
}

.module-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.module-card > :not(img) {
  margin-inline: 1rem;
}

.module-card strong {
  font-size: 1.2rem;
}

.module-card p {
  margin-block: 0.25rem 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.module-card small,
.module-card__eyebrow {
  color: var(--muted);
}

.feature-grid,
.example-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.feature-card {
  display: grid;
  gap: 0.5rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.feature-card strong {
  font-size: 1.05rem;
}

.feature-card span {
  color: var(--muted);
}

.media-section {
  display: grid;
  grid-template-columns: minmax(230px, 0.35fr) minmax(0, 0.65fr);
  gap: 2rem;
}

.example-grid {
  margin-top: 0;
}

.example-grid figure,
.chapter-photo {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.example-grid img,
.chapter-photo img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.example-grid figcaption,
.chapter-photo figcaption {
  padding: 0.8rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.visual-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1rem;
}

.topic-visual-card {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.topic-visual-card--wide {
  grid-column: span 2;
}

.topic-visual-card figcaption {
  display: grid;
  gap: 0.25rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.topic-visual-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fafc;
}

.topic-visual-card strong {
  color: var(--ink);
}

.keyboard-mini,
.numpad-mini,
.alpha-mini,
.arrow-mini,
.mouse-mini {
  min-height: 120px;
  padding: 0.75rem;
  border-radius: var(--radius);
  background: #202a3a;
}

.keyboard-mini {
  display: grid;
  gap: 0.65rem;
  color: #fff;
}

.key-row,
.numpad-mini,
.alpha-mini,
.arrow-mini {
  display: grid;
  gap: 0.35rem;
}

.function-row {
  grid-template-columns: repeat(13, minmax(28px, 1fr));
}

.numpad-mini {
  grid-template-columns: repeat(3, 1fr);
  background: #ecfdf3;
}

.alpha-mini {
  grid-template-columns: repeat(4, 1fr);
  background: #fff7ed;
}

.arrow-mini {
  grid-template-columns: repeat(4, 1fr);
  background: #fdf2f8;
}

.key-row span,
.numpad-mini span,
.alpha-mini span,
.arrow-mini span {
  display: grid;
  place-items: center;
  min-height: 34px;
  border-radius: 6px;
  font-weight: 900;
}

.key-row span {
  color: var(--brand-dark);
  background: #eaf1ff;
}

.numpad-mini span {
  color: #126043;
  background: #fff;
}

.alpha-mini span {
  color: #5f3413;
  background: #fff;
}

.arrow-mini span {
  color: #8b2753;
  background: #fff;
}

.mouse-mini {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: start;
  gap: 0.35rem;
  background: #f8fafc;
}

.mouse-mini span {
  display: grid;
  place-items: center;
  min-height: 78px;
  border: 2px solid #aeb9c9;
  border-radius: 999px 999px 30px 30px;
  color: var(--ink);
  font-weight: 800;
  text-align: center;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(230px, 0.35fr) minmax(0, 0.65fr);
  gap: 2rem;
}

.compact-grid {
  margin-top: 0;
}

.chapter-index {
  margin: 0;
  padding: 0;
  list-style: none;
  columns: 2;
  column-gap: 1.5rem;
}

.chapter-index li {
  break-inside: avoid;
  margin-bottom: 0.45rem;
}

.chapter-index a {
  display: block;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.chapter-index span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
}

.site-footer {
  padding: 2rem clamp(1rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: var(--soft);
}

.course-shell {
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 1rem;
  border-right: 1px solid var(--line);
  background: #f8fafc;
}

.sidebar .brand {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--brand-dark);
}

.sidebar .brand::before {
  margin-right: 0.55rem;
  vertical-align: middle;
}

.sidebar-toggle {
  display: none;
}

.module-nav {
  display: grid;
  gap: 0.75rem;
}

.module-nav h2 {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
}

.module-nav a {
  display: block;
  padding: 0.45rem 0.55rem;
  border-radius: 6px;
  font-size: 0.92rem;
  color: var(--muted);
}

.module-nav a.active,
.module-nav a:hover {
  color: var(--ink);
  background: #e9eef7;
}

.chapter-main {
  max-width: 980px;
  width: 100%;
  padding: clamp(1rem, 4vw, 3rem);
}

.chapter-header {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.chapter-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  color: var(--brand-dark);
  background: #eaf1ff;
  font-weight: 800;
  font-size: 0.82rem;
}

.hindi-title {
  margin: 0.65rem 0 0;
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--muted);
}

.chapter-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.chapter-intro {
  grid-template-columns: minmax(0, 1.1fr) minmax(260px, 0.9fr);
  align-items: stretch;
}

.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.content-card,
.image-card,
.test-card {
  padding: 1rem;
}

.content-card h2,
.image-card h2,
.test-card h2 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.content-card p,
.content-card ul,
.content-card ol,
.test-card ol,
.image-card p {
  margin: 0;
}

.content-card ul,
.content-card ol,
.test-card ol {
  padding-left: 1.25rem;
}

.content-card li + li,
.test-card li + li {
  margin-top: 0.35rem;
}

.bilingual-list {
  display: grid;
  gap: 0.75rem;
  list-style: none;
  padding-left: 0 !important;
}

.bilingual-list li {
  display: grid;
  gap: 0.25rem;
  padding: 0.75rem;
  border-radius: var(--radius);
  background: #f8fafc;
}

.bilingual-list span {
  color: var(--muted);
}

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

.command-card {
  display: grid;
  gap: 0.65rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fafc;
}

.command-card h3 {
  font-size: 1.05rem;
}

.command-card p {
  margin: 0;
}

.definition {
  display: grid;
  gap: 0.8rem;
  padding: 1rem;
  border-radius: var(--radius);
  background: var(--soft-2);
}

.definition strong {
  display: block;
  margin-bottom: 0.2rem;
  color: #126043;
}

.image-placeholder {
  display: grid;
  place-items: center;
  min-height: 170px;
  margin-bottom: 1rem;
  border: 2px dashed #aeb9c9;
  border-radius: var(--radius);
  color: var(--muted);
  background: #f8fafc;
  text-align: center;
  font-weight: 800;
}

.prompt-box {
  margin-top: 1rem !important;
  padding: 0.8rem;
  border-radius: var(--radius);
  background: #fff7ed;
  border: 1px solid #f2c896;
  color: #5f3413;
}

.site-note {
  margin-top: 0.8rem;
  color: var(--muted);
}

@media (max-width: 860px) {
  .topbar {
    flex-wrap: wrap;
    gap: 0.55rem;
  }

  .topbar a:not(.brand) {
    font-size: 0.88rem;
  }

  .site-hero {
    min-height: auto;
  }

  .hero-content {
    padding-top: 3rem;
  }

  .band,
  .chapter-intro,
  .split-layout,
  .media-section,
  .course-shell,
  .two-col {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .sidebar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 42px;
    margin: 0 0 0.75rem;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    color: var(--brand-dark);
    background: #fff;
    font-weight: 800;
  }

  body.nav-ready .sidebar .module-nav {
    max-height: 0;
    overflow: hidden;
  }

  body.nav-ready .sidebar.sidebar-open .module-nav {
    max-height: none;
    overflow: visible;
  }

  .chapter-index {
    columns: 1;
  }

  .topic-visual-card--wide {
    grid-column: auto;
  }

  .function-row {
    grid-template-columns: repeat(4, minmax(34px, 1fr));
  }
}

@media print {
  .sidebar,
  .chapter-actions,
  .topbar,
  .site-footer {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
    font-size: 11pt;
  }

  .course-shell,
  .chapter-main,
  .chapter-grid,
  .two-col {
    display: block;
  }

  .chapter-main {
    max-width: none;
    padding: 0;
  }

  .content-card,
  .image-card,
  .test-card,
  .definition {
    break-inside: avoid;
    border: 1px solid #aaa;
    margin: 0 0 0.75rem;
    box-shadow: none;
  }

  .image-placeholder {
    min-height: 90px;
  }
}