From 32f1d2dd7381dbbabe450f9c9a8ace0a8595137b Mon Sep 17 00:00:00 2001
From: Robert Andreas Kyllo <robertky@stud.ntnu.no>
Date: Thu, 17 Sep 2026 20:53:36 +0200
Subject: [PATCH] feat: refine digital library visual design (#41)

---
 src/App.css                           | 108 +++++++++++++++++++-------
 src/components/BookCard.css           |  58 ++++++++------
 src/components/BookJumpList.css       |  19 +++--
 src/components/FavoriteButton.css     |  29 +++++--
 src/components/FavoritesView.css      |  47 +++++++----
 src/components/NavigationControls.css |  33 +++++---
 src/components/SortSelect.css         |  21 +++--
 src/components/SubjectFilter.css      |  21 +++--
 src/index.css                         |  35 ++++++---
 9 files changed, 248 insertions(+), 123 deletions(-)

diff --git a/src/App.css b/src/App.css
index c16d5f4..777ffb3 100644
--- a/src/App.css
+++ b/src/App.css
@@ -2,38 +2,50 @@
   display: flex;
   flex-direction: column;
   min-height: 100vh;
+  background-color: var(--color-paper);
 }
 
 .app-header {
-  background-color: #2c3e50;
-  color: #ffffff;
-  padding: 1.25rem 1.5rem;
-  text-align: center;
+  border-bottom: 0.3125rem solid var(--color-accent);
+  background-color: var(--color-ink);
+  color: var(--color-surface);
+  padding: clamp(1.5rem, 5vw, 3rem) clamp(1rem, 4vw, 2rem);
+  text-align: left;
 }
 
 .app-header h1 {
-  margin: 0;
-  font-size: 1.75rem;
+  max-width: 60rem;
+  margin: 0 auto;
+  font-family: var(--font-display);
+  font-size: clamp(2rem, 5vw, 3.25rem);
+  letter-spacing: -0.02em;
+  line-height: 1;
 }
 
 .app-header p {
-  margin: 0.25rem 0 0;
+  max-width: 60rem;
+  margin: var(--space-2) auto 0;
   color: #d5dde5;
+  font-size: 1.0625rem;
 }
 
 .app-main {
   flex: 1;
   width: 100%;
-  max-width: 60rem;
+  max-width: 66rem;
   margin: 0 auto;
-  padding: 1.5rem;
+  padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2rem);
 }
 
 .library-controls {
   display: grid;
-  gap: 1rem;
+  gap: var(--space-4);
   max-width: 42rem;
-  margin: 0 auto 1.5rem;
+  margin: 0 auto 2rem;
+  padding: var(--space-4);
+  border-top: 1px solid var(--color-border);
+  border-bottom: 1px solid var(--color-border);
+  background-color: var(--color-surface-muted);
 }
 
 .library-controls .subject-filter,
@@ -45,42 +57,54 @@
 
 .view-navigation {
   display: flex;
-  gap: 0.5rem;
+  gap: var(--space-4);
   max-width: 32rem;
-  margin: 0 auto 1.5rem;
+  margin: 0 auto 2rem;
+  border-bottom: 1px solid var(--color-border);
 }
 
 .view-navigation button {
   flex: 1;
-  padding: 0.625rem 0.75rem;
-  border: 1px solid #cbd2d9;
-  border-radius: 0.375rem;
-  background-color: #ffffff;
-  color: #243b53;
+  margin-bottom: -1px;
+  padding: var(--space-3) var(--space-2);
+  border: 0;
+  border-bottom: 0.1875rem solid transparent;
+  background-color: transparent;
+  color: var(--color-ink-muted);
   font: inherit;
   font-weight: 600;
+  cursor: pointer;
 }
 
 .view-navigation button:hover {
-  background-color: #edf2f7;
+  color: var(--color-ink);
 }
 
 .view-navigation button[aria-pressed="true"] {
-  border-color: #2c3e50;
-  background-color: #2c3e50;
-  color: #ffffff;
+  border-bottom-color: var(--color-accent);
+  color: var(--color-ink);
 }
 
 .view-navigation button:focus-visible {
-  outline: 0.1875rem solid #2c3e50;
+  outline: 0.1875rem solid var(--color-focus);
   outline-offset: 0.125rem;
 }
 
 .book-viewer {
-  max-width: 32rem;
+  max-width: 40rem;
   margin: 0 auto;
 }
 
+.app-main [role="status"] p:not(.visually-hidden),
+.app-main [role="alert"] {
+  max-width: 40rem;
+  margin: 0 auto var(--space-4);
+  padding: var(--space-3) var(--space-4);
+  border-left: 0.25rem solid var(--color-accent);
+  background-color: var(--color-accent-soft);
+  color: var(--color-ink);
+}
+
 .visually-hidden {
   position: absolute;
   width: 1px;
@@ -91,9 +115,11 @@
 }
 
 .app-footer {
-  padding: 0.75rem;
+  margin-top: var(--space-5);
+  padding: var(--space-4);
+  border-top: 1px solid var(--color-border);
   text-align: center;
-  color: #616e7c;
+  color: var(--color-ink-muted);
   font-size: 0.875rem;
 }
 
@@ -106,11 +132,35 @@
 @media (max-width: 32rem) {
   .app-header,
   .app-main {
-    padding-right: 1rem;
-    padding-left: 1rem;
+    padding-right: var(--space-4);
+    padding-left: var(--space-4);
   }
 
   .app-header h1 {
-    font-size: 1.5rem;
+    font-size: 2rem;
+  }
+
+  .library-controls {
+    padding: var(--space-3);
+  }
+
+  .view-navigation {
+    flex-direction: column;
+    gap: 0;
+    border-bottom: 0;
+  }
+
+  .view-navigation button {
+    flex: 0 0 auto;
+    margin-bottom: 0;
+    border-bottom: 1px solid var(--color-border);
+    border-left: 0.1875rem solid transparent;
+    text-align: left;
+  }
+
+  .view-navigation button[aria-pressed="true"] {
+    border-bottom-color: var(--color-border);
+    border-left-color: var(--color-accent);
+    background-color: var(--color-surface-muted);
   }
 }
diff --git a/src/components/BookCard.css b/src/components/BookCard.css
index d47fc0e..66a4927 100644
--- a/src/components/BookCard.css
+++ b/src/components/BookCard.css
@@ -1,12 +1,12 @@
 .book-card {
   display: grid;
   grid-template-columns: minmax(8rem, 12rem) minmax(0, 1fr);
-  gap: 1.5rem;
+  gap: var(--space-5);
   overflow: hidden;
-  border: 1px solid #d5dde5;
-  border-radius: 0.75rem;
-  background-color: #ffffff;
-  box-shadow: 0 0.25rem 0.75rem rgb(44 62 80 / 12%);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-medium);
+  background-color: var(--color-surface);
+  box-shadow: var(--shadow-raised);
 }
 
 .book-card-cover {
@@ -16,8 +16,8 @@
   height: 18rem;
   min-width: 0;
   place-items: center;
-  background-color: #edf2f7;
-  color: #52606d;
+  background-color: var(--color-surface-muted);
+  color: var(--color-ink-muted);
   text-align: center;
 }
 
@@ -36,27 +36,30 @@
 
 .book-card-content {
   min-width: 0;
-  padding: 1.25rem 1.25rem 1.25rem 0;
+  padding: 1.5rem 1.5rem 1.5rem 0;
 }
 
 .book-card-metadata {
-  height: 7.5rem;
+  min-height: 10rem;
   overflow: visible;
 }
 
 .book-card-content h2 {
   margin: 0;
   max-height: 2.4em;
-  color: #243b53;
+  color: var(--color-ink);
+  font-family: var(--font-display);
+  font-size: clamp(1.5rem, 4vw, 2rem);
+  font-weight: 700;
   line-height: 1.2;
   overflow-wrap: anywhere;
   overflow: hidden;
 }
 
 .book-card-content p {
-  margin: 0.25rem 0 0;
+  margin: var(--space-2) 0 0;
   line-height: 1.2;
-  color: #52606d;
+  color: var(--color-ink-muted);
 }
 
 .book-card-authors {
@@ -69,7 +72,7 @@
 }
 
 .book-card-rating {
-  color: #243b53;
+  color: var(--color-ink);
   font-weight: 600;
 }
 
@@ -84,7 +87,7 @@
   flex-direction: column;
   height: 9rem;
   min-height: 9rem;
-  margin-top: 1.5rem;
+  margin-top: var(--space-5);
 }
 
 .book-card-subjects-section.is-expanded {
@@ -96,7 +99,7 @@
   display: flex;
   flex: 0 0 7rem;
   flex-wrap: wrap;
-  gap: 0.5rem;
+  gap: var(--space-2);
   align-content: flex-start;
   height: 7rem;
   min-height: 7rem;
@@ -118,8 +121,9 @@
   min-width: 0;
   max-width: 100%;
   border-radius: 999px;
-  background-color: #d9e2ec;
-  color: #243b53;
+  border: 1px solid var(--color-border);
+  background-color: var(--color-surface-muted);
+  color: var(--color-ink);
   padding: 0.25rem 0.625rem;
   font-size: 0.875rem;
   overflow: hidden;
@@ -137,18 +141,22 @@
 .book-card-subjects-controls button {
   max-width: 100%;
   border: 0;
-  border-radius: 999px;
-  background-color: #edf2f7;
-  color: #52606d;
-  padding: 0.25rem 0.625rem;
+  border-radius: 0;
+  background-color: transparent;
+  color: var(--color-accent);
+  padding: 0.25rem 0;
   font: inherit;
   font-weight: 600;
   overflow-wrap: anywhere;
   cursor: pointer;
 }
 
+.book-card-subjects-controls button:hover {
+  color: var(--color-ink);
+}
+
 .book-card-subjects-controls button:focus-visible {
-  outline: 0.1875rem solid #2c3e50;
+  outline: 0.1875rem solid var(--color-focus);
   outline-offset: 0.125rem;
 }
 
@@ -165,8 +173,8 @@
   .book-card-content {
     position: relative;
     z-index: 1;
-    padding: 1rem 1.25rem 1.25rem;
-    border-top: 1px solid #d5dde5;
-    background-color: #ffffff;
+    padding: 1.25rem;
+    border-top: 1px solid var(--color-border);
+    background-color: var(--color-surface);
   }
 }
diff --git a/src/components/BookJumpList.css b/src/components/BookJumpList.css
index 0e54246..64f8ec1 100644
--- a/src/components/BookJumpList.css
+++ b/src/components/BookJumpList.css
@@ -1,10 +1,10 @@
 .book-jump-list {
   display: flex;
   flex-direction: column;
-  gap: 0.5rem;
+  gap: var(--space-2);
   width: 100%;
   max-width: 24rem;
-  color: #243b53;
+  color: var(--color-ink);
   font-weight: 600;
 }
 
@@ -12,15 +12,20 @@
   width: 100%;
   min-height: 2.75rem;
   padding: 0.625rem 0.75rem;
-  border: 1px solid #d5dde5;
-  border-radius: 0.5rem;
-  background-color: #ffffff;
-  color: #1f2933;
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-small);
+  background-color: var(--color-surface);
+  color: var(--color-ink);
   font: inherit;
   font-weight: 400;
+  cursor: pointer;
+}
+
+.book-jump-list select:hover {
+  border-color: var(--color-ink-muted);
 }
 
 .book-jump-list select:focus-visible {
-  outline: 0.1875rem solid #2c3e50;
+  outline: 0.1875rem solid var(--color-focus);
   outline-offset: 0.125rem;
 }
diff --git a/src/components/FavoriteButton.css b/src/components/FavoriteButton.css
index e443cfe..a1878d6 100644
--- a/src/components/FavoriteButton.css
+++ b/src/components/FavoriteButton.css
@@ -1,19 +1,32 @@
 .favorite-button {
   align-self: flex-start;
-  margin-top: 1rem;
-  padding: 0.5rem 0.75rem;
-  border: 1px solid #cbd2d9;
-  border-radius: 0.375rem;
-  background-color: #ffffff;
-  color: #1f2933;
+  margin-top: var(--space-4);
+  padding: 0.625rem 0.875rem;
+  border: 1px solid var(--color-ink);
+  border-radius: var(--radius-small);
+  background-color: var(--color-surface);
+  color: var(--color-ink);
   font: inherit;
+  font-weight: 600;
+  cursor: pointer;
 }
 
 .favorite-button:hover {
-  background-color: #f5f7fa;
+  background-color: var(--color-surface-muted);
+}
+
+.favorite-button[aria-pressed="true"] {
+  border-color: var(--color-accent);
+  background-color: var(--color-accent);
+  color: #ffffff;
+}
+
+.favorite-button[aria-pressed="true"]:hover {
+  border-color: var(--color-ink);
+  background-color: var(--color-ink);
 }
 
 .favorite-button:focus-visible {
-  outline: 0.1875rem solid #2c3e50;
+  outline: 0.1875rem solid var(--color-focus);
   outline-offset: 0.125rem;
 }
diff --git a/src/components/FavoritesView.css b/src/components/FavoritesView.css
index 577feaf..60f8364 100644
--- a/src/components/FavoritesView.css
+++ b/src/components/FavoritesView.css
@@ -1,19 +1,22 @@
 .favorites-view {
   max-width: 32rem;
-  margin: 2rem auto 0;
-  padding-top: 1.5rem;
-  border-top: 1px solid #d5dde5;
+  margin: 2.5rem auto 0;
+  padding-top: var(--space-5);
+  border-top: 2px solid var(--color-ink);
 }
 
 .favorites-view h2 {
   margin: 0;
-  color: #243b53;
+  color: var(--color-ink);
+  font-family: var(--font-display);
+  font-size: clamp(1.75rem, 5vw, 2.25rem);
+  line-height: 1.1;
 }
 
 .favorites-view ul {
   display: grid;
-  gap: 0.75rem;
-  margin: 1rem 0 0;
+  gap: 0;
+  margin: var(--space-4) 0 0;
   padding: 0;
   list-style: none;
 }
@@ -22,10 +25,9 @@
   display: flex;
   align-items: center;
   justify-content: space-between;
-  gap: 1rem;
-  padding: 0.75rem;
-  border: 1px solid #d5dde5;
-  border-radius: 0.5rem;
+  gap: var(--space-4);
+  padding: var(--space-4) 0;
+  border-bottom: 1px solid var(--color-border);
 }
 
 .favorites-view h3,
@@ -33,25 +35,36 @@
   margin: 0;
 }
 
+.favorites-view h3 {
+  color: var(--color-ink);
+  font-family: var(--font-display);
+  font-size: 1.25rem;
+  line-height: 1.2;
+}
+
 .favorites-view p {
-  color: #616e7c;
+  margin-top: var(--space-1);
+  color: var(--color-ink-muted);
 }
 
 .favorites-view button {
+  flex: 0 0 auto;
   padding: 0.5rem 0.75rem;
-  border: 1px solid #cbd2d9;
-  border-radius: 0.375rem;
-  background-color: #ffffff;
-  color: #1f2933;
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-small);
+  background-color: var(--color-surface);
+  color: var(--color-ink);
   font: inherit;
+  font-weight: 600;
+  cursor: pointer;
 }
 
 .favorites-view button:hover {
-  background-color: #f5f7fa;
+  background-color: var(--color-surface-muted);
 }
 
 .favorites-view button:focus-visible {
-  outline: 0.1875rem solid #2c3e50;
+  outline: 0.1875rem solid var(--color-focus);
   outline-offset: 0.125rem;
 }
 
diff --git a/src/components/NavigationControls.css b/src/components/NavigationControls.css
index c8e73b1..040d498 100644
--- a/src/components/NavigationControls.css
+++ b/src/components/NavigationControls.css
@@ -2,34 +2,45 @@
   display: flex;
   align-items: center;
   justify-content: space-between;
-  gap: 1rem;
-  margin: 1rem 0 0;
+  gap: var(--space-3);
+  margin: var(--space-5) 0 0;
 }
 
 .navigation-progress {
   margin: 0;
-  color: #616e7c;
+  color: var(--color-ink-muted);
+  font-weight: 600;
   font-variant-numeric: tabular-nums;
 }
 
 .navigation-controls button {
-  padding: 0.5rem 1rem;
-  border: 1px solid #cbd2d9;
-  border-radius: 0.375rem;
-  background-color: #ffffff;
-  color: #1f2933;
+  min-width: 6.5rem;
+  padding: 0.625rem 1rem;
+  border: 1px solid var(--color-ink);
+  border-radius: var(--radius-small);
+  background-color: var(--color-surface);
+  color: var(--color-ink);
+  font: inherit;
+  font-weight: 600;
+  cursor: pointer;
 }
 
 .navigation-controls button:hover:not([aria-disabled="true"]) {
-  background-color: #f5f7fa;
+  background-color: var(--color-surface-muted);
 }
 
 .navigation-controls button:focus-visible {
-  outline: 2px solid #2c3e50;
-  outline-offset: 2px;
+  outline: 0.1875rem solid var(--color-focus);
+  outline-offset: 0.125rem;
 }
 
 .navigation-controls button[aria-disabled="true"] {
   opacity: 0.5;
   cursor: not-allowed;
 }
+
+@media (max-width: 32rem) {
+  .navigation-controls button {
+    min-width: 0;
+  }
+}
diff --git a/src/components/SortSelect.css b/src/components/SortSelect.css
index 92b0d6c..bd8209e 100644
--- a/src/components/SortSelect.css
+++ b/src/components/SortSelect.css
@@ -1,25 +1,30 @@
 .sort-select {
   display: flex;
   flex-direction: column;
-  gap: 0.5rem;
+  gap: var(--space-2);
   max-width: 20rem;
-  margin: 0 auto 1.5rem;
-  color: #243b53;
+  margin: 0 auto var(--space-5);
+  color: var(--color-ink);
   font-weight: 600;
 }
 
 .sort-select select {
   min-height: 2.75rem;
   padding: 0.625rem 0.75rem;
-  border: 1px solid #d5dde5;
-  border-radius: 0.5rem;
-  background-color: #ffffff;
-  color: #1f2933;
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-small);
+  background-color: var(--color-surface);
+  color: var(--color-ink);
   font: inherit;
   font-weight: 400;
+  cursor: pointer;
+}
+
+.sort-select select:hover {
+  border-color: var(--color-ink-muted);
 }
 
 .sort-select select:focus-visible {
-  outline: 0.1875rem solid #2c3e50;
+  outline: 0.1875rem solid var(--color-focus);
   outline-offset: 0.125rem;
 }
diff --git a/src/components/SubjectFilter.css b/src/components/SubjectFilter.css
index 5baffe6..831370a 100644
--- a/src/components/SubjectFilter.css
+++ b/src/components/SubjectFilter.css
@@ -1,25 +1,30 @@
 .subject-filter {
   display: flex;
   flex-direction: column;
-  gap: 0.5rem;
+  gap: var(--space-2);
   max-width: 20rem;
-  margin: 0 auto 1.5rem;
-  color: #243b53;
+  margin: 0 auto var(--space-5);
+  color: var(--color-ink);
   font-weight: 600;
 }
 
 .subject-filter select {
   min-height: 2.75rem;
   padding: 0.625rem 0.75rem;
-  border: 1px solid #d5dde5;
-  border-radius: 0.5rem;
-  background-color: #ffffff;
-  color: #1f2933;
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-small);
+  background-color: var(--color-surface);
+  color: var(--color-ink);
   font: inherit;
   font-weight: 400;
+  cursor: pointer;
+}
+
+.subject-filter select:hover {
+  border-color: var(--color-ink-muted);
 }
 
 .subject-filter select:focus-visible {
-  outline: 0.1875rem solid #2c3e50;
+  outline: 0.1875rem solid var(--color-focus);
   outline-offset: 0.125rem;
 }
diff --git a/src/index.css b/src/index.css
index c42878d..03f050f 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,3 +1,25 @@
+:root {
+  --color-ink: #243b53;
+  --color-ink-muted: #52606d;
+  --color-paper: #f7f5f0;
+  --color-surface: #ffffff;
+  --color-surface-muted: #edf2f7;
+  --color-border: #d5dde5;
+  --color-focus: #2c3e50;
+  --color-accent: #9c6644;
+  --color-accent-soft: #f1e7dc;
+  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+  --font-display: Georgia, "Times New Roman", serif;
+  --space-1: 0.25rem;
+  --space-2: 0.5rem;
+  --space-3: 0.75rem;
+  --space-4: 1rem;
+  --space-5: 1.5rem;
+  --radius-small: 0.375rem;
+  --radius-medium: 0.75rem;
+  --shadow-raised: 0 0.25rem 0.75rem rgb(44 62 80 / 12%);
+}
+
 *,
 *::before,
 *::after {
@@ -5,14 +27,7 @@
 }
 
 html {
-  font-family:
-    system-ui,
-    -apple-system,
-    "Segoe UI",
-    Roboto,
-    "Helvetica Neue",
-    Arial,
-    sans-serif;
+  font-family: var(--font-sans);
   line-height: 1.5;
   -webkit-text-size-adjust: 100%;
 }
@@ -20,8 +35,8 @@ html {
 body {
   margin: 0;
   min-height: 100vh;
-  background-color: #f7f5f0;
-  color: #1f2933;
+  background-color: var(--color-paper);
+  color: var(--color-ink);
 }
 
 img {