/* ============================================================================
 * Valentine — stylistic overrides on top of the Zensical base theme.
 * ========================================================================= */

/* --- Warmer pink primary ------------------------------------------------- */
:root,
[data-md-color-scheme="default"] {
  --md-primary-fg-color:        #e91e63;
  --md-primary-fg-color--light: #f06292;
  --md-primary-fg-color--dark:  #ad1457;
  --md-accent-fg-color:         #ff4081;
}

[data-md-color-scheme="slate"] {
  --md-primary-fg-color:        #f06292;
  --md-primary-fg-color--light: #f8bbd0;
  --md-primary-fg-color--dark:  #c2185b;
  --md-accent-fg-color:         #ff80ab;
  --md-hue: 330;
}

/* --- Header with a subtle gradient --------------------------------------- */
.md-header,
.md-tabs {
  background: linear-gradient(
    135deg,
    var(--md-primary-fg-color--dark) 0%,
    var(--md-primary-fg-color) 55%,
    var(--md-primary-fg-color--light) 100%
  );
  color: #ffffff;
}

/* Force readable white text on the gradient bar for both schemes */
.md-header,
.md-header a,
.md-header button,
.md-header label,
.md-header__title,
.md-header__topic,
.md-tabs,
.md-tabs a,
.md-tabs__link,
.md-tabs__item {
  color: #ffffff;
}

.md-header .md-search__input,
.md-header .md-search__input::placeholder {
  color: #ffffff;
}

.md-header .md-search__input {
  background-color: rgba(255, 255, 255, 0.18);
}

.md-header .md-search__input::placeholder {
  opacity: 0.85;
}

/* Hovered / active tab indicator */
.md-tabs__link {
  opacity: 0.78;
  transition: opacity 0.15s ease;
}

.md-tabs__link:hover,
.md-tabs__link--active,
.md-tabs__item--active .md-tabs__link {
  opacity: 1;
  font-weight: 600;
}

.md-header__title {
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* --- Typography tightening ----------------------------------------------- */
.md-typeset h1 {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.md-typeset h2 {
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-top: 2em;
}

/* --- Hero block on the landing page -------------------------------------- */
.valentine-hero {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
  margin-bottom: 2rem;
  border-radius: 0.75rem;
  background: linear-gradient(
    135deg,
    rgba(233, 30, 99, 0.08) 0%,
    rgba(255, 64, 129, 0.04) 100%
  );
}

[data-md-color-scheme="slate"] .valentine-hero {
  background: linear-gradient(
    135deg,
    rgba(240, 98, 146, 0.12) 0%,
    rgba(255, 128, 171, 0.06) 100%
  );
}

.valentine-hero-logo {
  width: 1em;
  height: 1em;
  vertical-align: -0.15em;
  margin-right: 0.2em;
  filter: drop-shadow(0 2px 6px rgba(233, 30, 99, 0.25));
}

.valentine-hero h1 {
  font-size: 3rem;
  margin: 0.25rem 0 0.5rem;
}

.valentine-hero .valentine-tagline {
  font-size: 1.15rem;
  color: var(--md-default-fg-color);
  opacity: 0.85;
  margin-bottom: 1.5rem;
}

.valentine-hero .valentine-badges {
  margin: 1.25rem 0 0.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  justify-content: center;
  opacity: 0.85;
}

.valentine-hero .valentine-badges img {
  height: 16px;
}

.valentine-hero .md-button {
  margin: 0.25rem 0.35rem;
}

/* --- Inline algorithm "chips" -------------------------------------------- */
.valentine-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin: 0.5rem 0 1.5rem;
}

.valentine-chips a {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: var(--md-primary-fg-color--light);
  color: #fff !important;
  font-size: 0.8rem;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease;
}

.valentine-chips a:hover {
  background: var(--md-primary-fg-color);
  transform: translateY(-1px);
}

/* --- Grid cards: lift on hover ------------------------------------------- */
.md-typeset .grid.cards > :is(ul, ol) > li,
.md-typeset .grid > .card {
  transition: transform 0.18s ease, box-shadow 0.18s ease,
    border-color 0.18s ease;
}

.md-typeset .grid.cards > :is(ul, ol) > li:hover,
.md-typeset .grid > .card:hover {
  transform: translateY(-3px);
  border-color: var(--md-primary-fg-color--light);
  box-shadow: 0 6px 20px rgba(233, 30, 99, 0.12);
}

/* --- 404 page ------------------------------------------------------------ */
.valentine-404 {
  text-align: center;
  padding: 3rem 1rem 2rem;
  max-width: 38rem;
  margin: 0 auto;
}

.valentine-404-logo {
  width: 140px;
  height: auto;
  margin-bottom: 1.5rem;
  filter: drop-shadow(0 4px 16px rgba(233, 30, 99, 0.25));
}

.valentine-404 h1 {
  font-size: 2rem;
  margin: 0 0 0.5rem;
}

.valentine-404-tagline {
  font-size: 1.05rem;
  opacity: 0.85;
  margin-bottom: 1.5rem;
}

.valentine-404 .md-button {
  margin: 0.25rem 0.35rem;
}

.valentine-404-hint {
  margin-top: 2rem;
  font-size: 0.85rem;
  opacity: 0.7;
}

/* --- Code blocks: a touch more breathing room ---------------------------- */
.md-typeset pre > code {
  padding: 1em 1.2em;
}