:root {
  --ink: #142028;
  --ink-soft: #3a4750;
  --paper: #eef3f7;
  --paper-deep: #d9e3eb;
  --sea: #1a4f6e;
  --sea-deep: #0f3550;
  --sun: #7eb8d4;
  --foam: #ffffff;
  --line: rgba(20, 32, 40, 0.12);
  --shadow: 0 18px 50px rgba(10, 30, 40, 0.18);
  --measure: 52rem;
  --nav-height: 3.4rem;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-ui: "Figtree", "Helvetica Neue", Arial, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 0.75rem);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(26, 79, 110, 0.10), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(126, 184, 212, 0.10), transparent 55%),
    linear-gradient(180deg, #d5e2ec 0%, var(--paper) 18%, var(--paper) 100%);
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-size: 1.125rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--sea);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--sea-deep);
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--foam);
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip:focus {
  left: 1rem;
  top: calc(var(--nav-height) + 0.5rem);
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: #f3f6f8;
  background: color-mix(in srgb, #f3f6f8 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6);
}

.site-nav__inner {
  width: min(1100px, calc(100% - 1.5rem));
  margin: 0 auto;
  min-height: var(--nav-height);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 0.75rem;
}

.site-nav__brand {
  justify-self: start;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-nav__brand:hover {
  color: var(--sea-deep);
}

.site-nav__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  justify-self: center;
  gap: 0.15rem 0.15rem;
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 600;
}

.site-nav__links a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.45rem 0.65rem;
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav__links a:hover,
.site-nav__links a:focus {
  color: var(--sea-deep);
  background: rgba(14, 92, 102, 0.08);
  outline: none;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-self: end;
  gap: 0.35rem;
  margin-left: 0;
  padding-left: 0;
  border-left: 0;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.lang-switch a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.35rem 0.3rem;
}

.lang-switch a:hover,
.lang-switch a:focus {
  color: var(--sea-deep);
  background: transparent;
}

.lang-switch__current {
  color: var(--sea-deep);
  padding: 0.35rem 0.3rem;
}

.lang-switch__sep {
  color: rgba(20, 32, 40, 0.28);
  user-select: none;
}

.progress {
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--sea), var(--sun));
  transition: width 0.1s linear;
}

#cover,
#vorspann,
#streckenbeschreibung,
#inhalt,
.chapter {
  scroll-margin-top: calc(var(--nav-height) + 0.75rem);
}

@media (max-width: 720px) {
  :root {
    --nav-height: 5.2rem;
  }

  .site-nav__inner {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand lang"
      "links links";
    padding: 0.35rem 0;
    row-gap: 0.15rem;
  }

  .site-nav__brand {
    grid-area: brand;
    font-size: 0.82rem;
    max-width: 55vw;
  }

  .lang-switch {
    grid-area: lang;
    font-size: 0.75rem;
    gap: 0.2rem;
  }

  .site-nav__links {
    grid-area: links;
    font-size: 0.78rem;
    gap: 0;
    width: 100%;
  }

  .site-nav__links a {
    padding: 0.35rem 0.4rem;
  }
}

/* Cover */
.cover {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--foam);
  overflow: hidden;
  isolation: isolate;
}

.cover__media {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center center;
  transform: scale(1.04);
  animation: cover-drift 18s var(--ease) infinite alternate;
  z-index: -2;
}

.cover__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(8, 24, 32, 0.15) 0%, rgba(8, 24, 32, 0.2) 35%, rgba(8, 24, 32, 0.78) 100%),
    linear-gradient(90deg, rgba(8, 30, 36, 0.35), transparent 55%);
}

.cover__content {
  width: min(920px, calc(100% - 2.5rem));
  margin: 0 auto 12vh;
  padding-top: 30vh;
  animation: rise 1.1s var(--ease) both;
}

.cover__series {
  margin: 0 0 0.75rem;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.9;
}

.cover__title {
  margin: 0;
  font-weight: 700;
  font-size: clamp(2.6rem, 8vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.cover__from,
.cover__to {
  display: block;
}

.cover__arrow {
  display: inline-block;
  margin: 0.15em 0;
  font-weight: 400;
  opacity: 0.75;
  animation: arrow-nudge 2.4s var(--ease) infinite;
}

.cover__lede {
  max-width: 34rem;
  margin: 1.25rem 0 0;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  line-height: 1.55;
  font-weight: 400;
  opacity: 0.92;
}

.cover__meta {
  margin: 1rem 0 0;
  font-family: var(--font-ui);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  opacity: 0.8;
}

.cover__cta {
  display: inline-flex;
  align-items: center;
  margin-top: 1.75rem;
  padding: 0.85rem 1.35rem;
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.1);
  color: var(--foam);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.25s ease, transform 0.25s var(--ease), border-color 0.25s ease;
}

.cover__cta:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.85);
  color: var(--foam);
  transform: translateY(-2px);
}

.cover__scroll {
  position: absolute;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%);
  opacity: 0.7;
}

.cover__scroll span {
  display: block;
  width: 1px;
  height: 42px;
  background: linear-gradient(to bottom, transparent, #fff);
  animation: drip 1.8s ease-in-out infinite;
}

/* Table of contents */
.toc-section {
  width: min(980px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 5rem 0 3rem;
}

.toc-section__intro {
  max-width: 36rem;
  margin-bottom: 2.5rem;
  animation: rise 0.9s var(--ease) both;
}

.eyebrow {
  margin: 0 0 0.5rem;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sea);
}

.toc-section__intro h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.toc-section__intro p {
  margin: 0.75rem 0 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.toc {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.toc-item {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  align-items: center;
  padding: 1.05rem 0.2rem;
  border-bottom: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
  transition: background 0.25s ease, padding-left 0.35s var(--ease);
}

.toc-item:hover {
  background: rgba(14, 92, 102, 0.05);
  padding-left: 0.55rem;
  color: inherit;
}

.toc-num {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--sea);
}

.toc-body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.25;
}

.toc-meta {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  line-height: 1.35;
}

.toc-item--front .toc-num {
  opacity: 0.45;
}

.toc-item--front .toc-thumb {
  display: none;
}

.book--front {
  margin-bottom: 0;
}

.front-matter .route-map {
  margin: 1.35rem 0 1.75rem;
  padding: 0.65rem;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(20, 32, 40, 0.08);
}

.front-matter .route-map img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--paper-deep);
}

.toc-thumb {
  width: 5.5rem;
  height: 3.6rem;
  background-size: cover;
  background-position: center;
  filter: saturate(0.92);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.toc-totals {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.25rem;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--line);
}

.toc-total {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.toc-total__label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.toc-total__value {
  font-family: var(--font-ui);
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 700;
  color: var(--sea-deep);
  letter-spacing: 0.01em;
}

@media (max-width: 720px) {
  .toc-totals {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
}

/* Chapters / book pages */
.book {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto 4rem;
}

.chapter {
  position: relative;
  margin: 0 0 4.5rem;
  padding: 2.75rem 2rem 2rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.65);
  box-shadow: var(--shadow);
  backdrop-filter: blur(2px);
}

.chapter::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--sea), transparent 70%);
  opacity: 0.85;
}

.chapter-open {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.chapter-open--with-map {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.25rem 1.5rem;
  align-items: start;
}

.chapter-open__text {
  min-width: 0;
}

.chapter-kicker {
  margin: 0 0 0.6rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sea);
}

.chapter-title {
  margin: 0;
  font-size: clamp(1.85rem, 4.2vw, 2.55rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.stage-badge {
  display: inline-block;
  margin-top: 0.85rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--sun);
  padding-bottom: 0.1rem;
}

.chapter-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.5rem;
  margin-top: 1rem;
  font-family: var(--font-ui);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stat__label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.stat__value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--sea-deep);
  letter-spacing: 0.01em;
}

.chapter-ornament {
  width: 3rem;
  height: 2px;
  margin-top: 1.25rem;
  background: var(--sun);
}

.map-thumb {
  position: relative;
  display: block;
  width: clamp(7.5rem, 18vw, 10.5rem);
  flex-shrink: 0;
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(10, 30, 40, 0.16);
  border: 1px solid rgba(20, 32, 40, 0.1);
  background: var(--paper-deep);
  transition: transform 0.25s var(--ease), box-shadow 0.25s ease;
}

.map-thumb img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center top;
  display: block;
}

.map-thumb__hint {
  position: absolute;
  left: 0.45rem;
  bottom: 0.45rem;
  padding: 0.2rem 0.45rem;
  background: rgba(10, 30, 36, 0.72);
  color: #fff;
  font-family: var(--font-ui);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.map-thumb:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 32px rgba(10, 30, 40, 0.22);
  color: inherit;
}

.chapter-body {
  max-width: none;
}

.chapter-body > ul {
  margin: 0 0 1.25rem 1.25rem;
  padding: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
}
.chapter-body > ul li {
  margin: 0.35rem 0;
}
.chapter-body > p {
  margin: 0 0 1.15rem;
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--ink);
}

.chapter-body > p:first-child::first-letter {
  float: left;
  font-size: 3.4rem;
  line-height: 0.85;
  padding: 0.12em 0.12em 0 0;
  font-weight: 700;
  color: var(--sea-deep);
}

/* Always two photos side by side, with caption inside each tile */
.chapter-gallery {
  margin-top: 2rem;
}

.photo-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 0 0 1rem;
  overflow: visible;
}

.photo-pair .photo {
  margin: 0;
  padding: 0.65rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(20, 32, 40, 0.08);
  break-inside: avoid;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
  z-index: 1;
  overflow: visible;
}

.photo-pair .photo img {
  width: 100%;
  aspect-ratio: 4 / 3;
  height: auto;
  object-fit: contain;
  object-position: center;
  background: var(--paper-deep);
  display: block;
}

@media (hover: hover) and (pointer: fine) {
  .photo-pair .photo {
    cursor: zoom-in;
  }
}

.photo-pair .photo figcaption {
  margin: 0.55rem 0.15rem 0.1rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink-soft);
}

.photo-pair .photo:only-child {
  grid-column: 1 / -1;
  max-width: 50%;
}

.page-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
}

.page-nav__link,
.page-nav__toc {
  color: var(--sea);
  text-decoration: none;
  padding: 0.4rem 0;
  transition: color 0.2s ease, transform 0.25s var(--ease);
}

.page-nav__link:hover,
.page-nav__toc:hover {
  color: var(--sea-deep);
  transform: translateY(-1px);
}

.page-nav__toc {
  color: var(--ink-soft);
  font-weight: 500;
}

/* Colophon */
.colophon {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, rgba(14, 92, 102, 0.06));
  padding: 3.5rem 1rem 4rem;
}

.colophon__inner {
  width: min(640px, 100%);
  margin: 0 auto;
  text-align: center;
}

.colophon__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sea);
}

.colophon p {
  margin: 0.4rem 0;
  color: var(--ink-soft);
  font-size: 1rem;
}

.colophon__back {
  margin-top: 1.25rem !important;
  font-family: var(--font-ui);
  font-weight: 600;
}

.toc-fab {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 40;
  border: 0;
  padding: 0.75rem 1rem;
  background: var(--sea);
  color: var(--foam);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  box-shadow: 0 10px 28px rgba(10, 40, 48, 0.28);
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.2s ease;
}

.toc-fab:hover {
  background: var(--sea-deep);
  transform: translateY(-2px);
}

.toc-fab[hidden] {
  display: none;
}

/* Motion */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes cover-drift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.08) translate3d(0, -1.5%, 0); }
}

@keyframes arrow-nudge {
  0%, 100% { transform: translateX(0); opacity: 0.75; }
  50% { transform: translateX(6px); opacity: 1; }
}

@keyframes drip {
  0% { transform: scaleY(0.3); opacity: 0; }
  40% { opacity: 0.9; }
  100% { transform: scaleY(1); opacity: 0; }
}

.chapter.is-visible {
  animation: rise 0.85s var(--ease) both;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cover__media,
  .cover__arrow,
  .cover__scroll span,
  .chapter.is-visible,
  .cover__content,
  .toc-section__intro {
    animation: none !important;
  }
}

@media (max-width: 720px) {
  body { font-size: 1.05rem; }

  .cover__content {
    margin-bottom: 16vh;
  }

  .toc-item {
    grid-template-columns: 3.2rem 1fr;
  }

  .toc-thumb {
    display: none;
  }

  .chapter {
    padding: 1.75rem 1.05rem 1.4rem;
    margin-bottom: 2.5rem;
  }

  .chapter-open--with-map {
    grid-template-columns: 1fr auto;
    gap: 0.85rem;
  }

  .map-thumb {
    width: 5.75rem;
  }

  .chapter-stats {
    gap: 0.65rem 1rem;
  }

  .stat__value {
    font-size: 0.95rem;
  }

  .chapter-body > p:first-child::first-letter {
    font-size: 2.7rem;
  }

  .photo-pair {
    gap: 0.65rem;
    margin: 0 0 0.75rem;
  }

  .photo-pair .photo {
    padding: 0.3rem;
  }

  .photo-pair .photo figcaption {
    font-size: 0.72rem;
    margin-top: 0.4rem;
  }

  .photo-pair .photo:only-child {
    max-width: 100%;
  }
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background: rgba(8, 18, 24, 0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.lightbox[hidden] {
  display: none;
}

.lightbox__img {
  max-width: 98vw;
  max-height: 96vh;
  width: auto;
  height: auto;
  object-fit: contain;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  background: #111;
}

.lightbox__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1rem;
  margin: 0;
  text-align: center;
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--font-ui);
  font-size: 0.9rem;
}

.lightbox__close {
  position: absolute;
  top: 0.75rem;
  right: 0.85rem;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.22);
}

body.lightbox-open {
  overflow: hidden;
}

/* Hover preview: 2.5× page size, anchored on the thumbnail */
.photo-hover {
  position: fixed;
  z-index: 75;
  margin: 0;
  padding: 0;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease, visibility 0.15s ease;
  box-shadow: 0 22px 55px rgba(8, 18, 24, 0.45);
  background: #fff;
  overflow: hidden;
}

.photo-hover.is-on {
  opacity: 1;
  visibility: visible;
}

.photo-hover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--paper-deep);
}

@media (prefers-reduced-motion: reduce) {
  .photo-hover {
    transition: none;
  }
}

.chapter-strava {
  margin: 0.75rem 0 0;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
}
.chapter-strava a {
  color: var(--sea);
  text-decoration: none;
}
.chapter-strava a:hover {
  text-decoration: underline;
}