body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  line-height: 1.65;
  background-color: var(--color-background-page);
  color: var(--color-text);
}

header {
  background-color: var(--color-background-header);
  color: var(--color-text-inverted);
  padding: 1.75rem 2rem;
  border-bottom: 1px solid var(--color-border);
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

section {
  background-color: var(--color-background-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 1.6rem;
  margin-bottom: 1.2rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

h1,
h2 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-family-display);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0;
}

header h1 {
  margin: 0;
  color: var(--color-text-inverted);
  font-size: 3rem;
  line-height: 1.05;
}

h2 {
  font-size: 2rem;
  line-height: 1.15;
  margin-bottom: 1rem;
}

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

nav {
  margin-top: 0.75rem;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.14em;
}

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

header a {
  color: var(--color-text-inverted);
}

main button {
  min-height: 2.2rem;
  border: 1px solid var(--color-accent);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  background-color: var(--color-accent);
  color: var(--color-text-on-accent);
  font: inherit;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
}

main button:hover {
  background-color: var(--color-accent-hover);
}

main button:disabled {
  cursor: wait;
  opacity: 0.68;
}

input,
select {
  width: 100%;
  min-height: 2.35rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.45rem 0.65rem;
  background-color: var(--color-background-card);
  color: var(--color-text);
  font: inherit;
}

label {
  display: grid;
  gap: 0.3rem;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

#login-form {
  display: grid;
  gap: 0.85rem;
}

#login-form button {
  justify-self: start;
  margin-top: 0.35rem;
}

#login-error {
  min-height: 1.2rem;
  margin: 0;
  color: #b33a3a;
  font-weight: var(--font-weight-medium);
}

ul {
  margin: 0;
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.55rem;
}

strong {
  font-weight: var(--font-weight-medium);
}

.lab-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: 0.75rem;
  padding: 0;
  list-style: none;
}

.lab-list li {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding: 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background-color: var(--color-background-subtle);
}

.lab-list strong {
  line-height: 1.25;
}

.lab-list span {
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

.lab-list .current-lab {
  border-color: var(--color-accent);
  background-color: var(--color-background-card);
}

time {
  color: var(--color-text-muted);
}

.note-box {
  margin-top: 1.25rem;
  background-color: var(--color-background-subtle);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1rem 1rem 0.25rem;
}

.intro {
  max-width: 980px;
  margin: 0 auto;
  padding: 1rem 1.5rem 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

/* icon styling */
svg.icon {
  width: 1.2em;
  height: 1.2em;
  vertical-align: -0.15em;
  fill: currentColor;
  flex-shrink: 0;
}

/* card layout with icon on the left */
.section-card {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.5rem;
  align-items: center; 
}

.section-card-icon {
  width: 72px;
  height: 72px;
  border-radius: 999px;
  background-color: #ededed;
  display: flex;
  align-items: center;
  justify-content: center;
}

.section-card-icon svg.icon {
  width: 1.8rem;
  height: 1.8rem;
}

.section-card-content {
  border-left: 1px solid var(--color-border);
  padding-left: 1.5rem;
}

.section-card-content h2 {
  margin-bottom: 0.5rem;
}

.section-card-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0.5rem 0 1rem;
  opacity: 0.6;
}

.todo-shell .section-card {
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  padding: 2rem;
}

.todo-shell .section-card-icon {
  display: none;
}

.todo-shell .section-card-content {
  border-left: 0;
  padding-left: 0;
}

.todo-layout {
  display: grid;
  grid-template-columns: minmax(17rem, 0.75fr) minmax(0, 1.65fr);
  gap: 1.25rem;
  align-items: start;
}

.todo-layout-list-only {
  grid-template-columns: minmax(0, 1fr);
}

.task-list-panel {
  min-width: 0;
}

.task-filter-nav {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0 0 1rem;
  padding: 0.25rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background-color: var(--color-background-page);
}

.task-filter-nav a {
  min-height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.25rem 0.8rem;
  color: var(--color-text);
  text-decoration: none;
}

.task-filter-nav a:hover,
.task-filter-nav a[aria-current="page"] {
  background-color: var(--color-accent);
  color: var(--color-text-on-accent);
}

/* task/status inline icon spacing */
.status-with-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

section + section {
  margin-top: 0;
}

@media (max-width: 640px) {
  header {
    padding: 1.25rem 1rem;
  }

  header h1 {
    font-size: 2.4rem;
  }

  main {
    padding: 1.5rem 1rem 3rem;
  }

  section {
    padding: 1.1rem 1rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  .section-card {
    grid-template-columns: 1fr;
    gap: 0.9rem;
  }

  .section-card-icon {
    width: 56px;
    height: 56px;
  }

  .section-card-icon svg.icon {
    width: 1.5rem;
    height: 1.5rem;
  }
}
.page-title {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.page-title-icon {
  width: 2.5rem;
  height: 2.5rem;
  margin-right: 0;
  flex-shrink: 0;
}

header h1 {
  margin: 0;
  color: var(--color-text-inverted);
  font-size: 3rem;
  line-height: 1.05;
}

.task-preview-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 21rem), 1fr));
  gap: 1rem;
}

.task-preview-card {
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 1rem;
  background: var(--color-background-card);
}

.task-preview-card h3 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.task-preview-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0;
}

.task-preview-meta div {
  display: grid;
  gap: 0.25rem;
}

.task-preview-meta dt {
  font-weight: 700;
  color: var(--color-text);
}

.task-preview-meta dd {
  margin: 0;
}

.status-badge {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  min-height: 1.65rem;
  border-radius: 999px;
  padding: 0.15rem 0.65rem;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

.status-badge-pending {
  border: 1px solid #b48a20;
  background-color: #fff6d8;
  color: #634800;
}

.status-badge-completed {
  border: 1px solid #277a4f;
  background-color: #dff5e8;
  color: #185536;
}

body.dark-mode .status-badge-pending {
  border-color: #d8b85a;
  background-color: #3a3013;
  color: #ffe39a;
}

body.dark-mode .status-badge-completed {
  border-color: #62bd8d;
  background-color: #143322;
  color: #a9e8c3;
}

.task-form {
  display: grid;
  grid-template-columns:
    minmax(16rem, 2fr)
    minmax(9rem, 1fr)
    minmax(9rem, 1fr)
    minmax(10rem, 1fr)
    auto;
  align-items: end;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

task-form .task-form {
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0 1.25rem 0 0;
  border-right: 1px solid var(--color-border);
  border-bottom: 0;
}

.task-form-heading {
  margin: 0;
  font-size: 1.1rem;
}

.task-form-actions,
.task-preview-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.task-form-actions {
  align-items: end;
}

.task-preview-actions {
  margin-top: 1rem;
}

.task-preview-actions button,
.task-form-actions button {
  min-height: 2rem;
}

.secondary-button {
  border-color: var(--color-border);
  background-color: var(--color-background-card);
  color: var(--color-text);
}

.secondary-button:hover {
  background-color: var(--color-background-subtle);
  color: var(--color-text);
}

.danger-button {
  border-color: #b33a3a;
  background-color: #b33a3a;
  color: #ffffff;
}

.danger-button:hover {
  background-color: #8f2727;
}

.task-form-error {
  color: #b33a3a;
  font-weight: var(--font-weight-medium);
}

@media (max-width: 700px) {
  .todo-layout {
    grid-template-columns: 1fr;
  }

  .task-form {
    grid-template-columns: 1fr;
  }

  task-form .task-form {
    padding: 0 0 1rem;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .todo-shell .section-card {
    padding: 1.1rem 1rem;
  }
}