/*
  Superdog page — periodic-table age finder.
  Sky-flight comic energy using the site palette (navy, peach, soft green).
*/

.sd-section {
  margin: 2.75rem auto 0;
  max-width: 720px;
}

.sd-heading {
  font-size: 1.35rem;
  text-align: center;
  color: var(--subheader-color);
  margin-bottom: 0.4rem;
}

.sd-intro {
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
  opacity: 0.9;
  line-height: 1.55;
  text-align: center;
}

.sd-intro strong {
  color: var(--header-color);
  font-weight: 600;
}

.sd-intro em {
  font-style: italic;
}

/* ===== Periodic table age finder ===== */
.sd-age-form {
  display: grid;
  gap: 0.65rem;
  justify-items: center;
  margin-bottom: 1.25rem;
}

.sd-age-label {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 500;
  text-align: center;
}

.sd-age-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: end;
  justify-content: center;
  width: 100%;
}

.sd-age-field {
  display: grid;
  gap: 0.3rem;
  justify-items: center;
}

.sd-age-field-label {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  opacity: 0.75;
}

.sd-age-and {
  align-self: center;
  padding-bottom: 0.15rem;
  font-size: 1.1rem;
  font-weight: 600;
  opacity: 0.65;
}

.sd-age-input {
  width: 6.5rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid rgb(201 194 186 / 35%);
  border-radius: 8px;
  background: var(--primary-color);
  color: var(--text-color);
  font: inherit;
  font-size: 1.05rem;
  text-align: center;
}

.sd-element-results {
  display: grid;
  gap: 1rem;
}

.sd-element-results[hidden] {
  display: none;
}

.sd-age-input:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.sd-age-error {
  margin: 0;
  color: #f0a090;
  font-size: 0.88rem;
}

.sd-btn {
  appearance: none;
  border: 1px solid rgb(201 194 186 / 40%);
  border-radius: 8px;
  padding: 0.65rem 1.15rem;
  background: linear-gradient(180deg, #3a5f86 0%, #2a4a6e 100%);
  color: var(--text-color);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease;
}

.sd-btn:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, #45729c 0%, #335780 100%);
}

.sd-btn:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.sd-btn-ghost {
  background: transparent;
  font-weight: 500;
  opacity: 0.9;
}

.sd-btn-ghost:hover {
  background: rgb(255 255 255 / 6%);
}

.sd-element-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.25rem;
  align-items: center;
  padding: 1.25rem 1.35rem;
  border-radius: 12px;
  background:
    radial-gradient(ellipse 70% 80% at 0% 50%, rgb(156 187 128 / 18%), transparent 55%),
    var(--primary-color);
  border: 1px solid rgb(201 194 186 / 22%);
}

/* display: grid would otherwise override the hidden attribute. */
.sd-element-card[hidden] {
  display: none;
}

.sd-element-card.sd-is-krypton {
  background:
    radial-gradient(ellipse 80% 90% at 10% 40%, rgb(250 202 161 / 22%), transparent 55%),
    radial-gradient(ellipse 60% 70% at 90% 70%, rgb(156 187 128 / 16%), transparent 50%),
    var(--primary-color);
  border-color: rgb(250 202 161 / 45%);
}

.sd-element-tile {
  position: relative;
  display: grid;
  place-items: center;
  width: 6.5rem;
  height: 6.5rem;
  border-radius: 10px;
  background: linear-gradient(160deg, #1a334d 0%, #0f2438 100%);
  border: 2px solid var(--accent-color);
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 6%);
}

.sd-el-number {
  position: absolute;
  top: 0.35rem;
  left: 0.5rem;
  font-size: 0.75rem;
  opacity: 0.7;
}

.sd-el-symbol {
  font-family: Righteous, sans-serif;
  font-size: 2.15rem;
  line-height: 1;
  color: var(--header-color);
}

.sd-el-name {
  position: absolute;
  bottom: 1.15rem;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.85;
}

.sd-el-mass {
  position: absolute;
  bottom: 0.3rem;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.62rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  opacity: 0.7;
}

.sd-element-facts {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.4rem;
  min-width: 0;
}

.sd-el-headline {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--subheader-color);
  line-height: 1.35;
}

.sd-el-meta {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.95rem;
  opacity: 0.85;
}

.sd-el-radioactive-mark {
  flex: 0 0 auto;
  width: 0.95rem;
  height: 0.95rem;
  display: block;
}

.sd-el-aside {
  margin: 0;
  font-size: 0.88rem;
  font-style: italic;
  color: var(--header-color);
  opacity: 0.9;
}

.sd-el-aside[hidden] {
  display: none;
}

.sd-el-learn {
  margin-top: 0.15rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: #FFCBA4;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.sd-el-learn:hover {
  color: #ffe0c8;
}

.sd-el-learn:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 3px;
  border-radius: 4px;
}

.sd-element-viz-tile {
  overflow: hidden;
  align-content: center;
  padding-bottom: 0.9rem;
}

/* display: grid on .sd-element-tile would otherwise override [hidden]. */
.sd-element-viz-tile[hidden] {
  display: none;
}

.sd-element-card.sd-no-viz {
  grid-template-columns: auto 1fr;
}

.sd-el-viz-art {
  display: grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
}

.sd-el-viz-art svg {
  width: 100%;
  height: 100%;
  display: block;
}

.sd-el-viz-caption {
  position: absolute;
  bottom: 0.35rem;
  left: 0.25rem;
  right: 0.25rem;
  text-align: center;
  font-size: 0.62rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  opacity: 0.8;
  line-height: 1.2;
}

@media (width <= 560px) {
  .sd-element-card {
    grid-template-columns: auto auto;
    justify-items: center;
    text-align: center;
  }

  .sd-element-card.sd-no-viz {
    grid-template-columns: auto;
  }

  .sd-element-facts {
    grid-column: 1 / -1;
    order: -1;
  }
}