* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

body.has-open-detail {
  overflow: hidden;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2,
h3 {
  letter-spacing: 0;
}

button,
a,
input {
  -webkit-tap-highlight-color: transparent;
}

a {
  text-decoration: none;
}

.visually-hidden {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

.app-shell {
  margin: 0 auto;
  max-width: 1800px;
  min-height: 100vh;
  padding: 28px;
}

.masthead {
  align-items: end;
  border-bottom: 1px solid var(--divider);
  display: grid;
  gap: var(--space-5);
  grid-template-columns: minmax(0, 1fr) auto;
  padding: var(--space-6) 0 var(--space-5);
}

.masthead__copy {
  max-width: 980px;
}

.masthead h1 {
  font-size: clamp(48px, 7vw, 132px);
  line-height: 0.92;
  margin-top: var(--space-3);
  max-width: 12ch;
}

.masthead p:not(.db-eyebrow) {
  color: var(--text-2);
  font-size: 20px;
  line-height: 1.45;
  margin-top: var(--space-5);
  max-width: 720px;
}

.masthead__stat {
  align-items: end;
  display: flex;
  gap: var(--space-2);
}

.masthead__stat span {
  color: var(--signal);
  font-family: var(--font-display);
  font-size: clamp(56px, 8vw, 144px);
  font-weight: 700;
  line-height: 0.75;
}

.masthead__stat small {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding-bottom: 7px;
  text-transform: uppercase;
}

.controls {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5) 0 var(--space-4);
}

.search-field input {
  background: var(--surface-1);
  border: 1px solid var(--divider);
  border-radius: var(--radius-card);
  color: var(--text-1);
  font-size: 18px;
  height: 56px;
  outline: none;
  padding: 0 var(--space-4);
  width: min(100%, 560px);
}

.search-field input:focus {
  border-color: var(--signal);
}

.search-field input::placeholder {
  color: var(--text-3);
}

.filter-strip {
  align-items: start;
  display: grid;
  gap: var(--space-2);
  grid-template-columns: auto minmax(0, 1fr);
}

.filter-strip__items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  max-height: 96px;
  overflow: auto;
  padding-right: var(--space-2);
}

.chip {
  align-items: center;
  background: transparent;
  border: 1px solid var(--divider);
  border-radius: 999px;
  color: var(--text-2);
  cursor: pointer;
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 12px;
  gap: 7px;
  height: 34px;
  letter-spacing: 0;
  padding: 0 12px;
  white-space: nowrap;
}

.chip span {
  color: var(--text-3);
}

.chip:hover,
.chip--active {
  border-color: var(--chip-accent, var(--signal));
  color: var(--text-1);
}

.chip--active {
  background: var(--chip-accent, var(--signal));
  color: var(--bg);
}

.chip--active span {
  color: rgba(10, 10, 10, 0.64);
}

/* Family chips take their family accent colour when active */
[data-family="futures-technology"].chip--active    { --chip-accent: #9D90F8; }
[data-family="business-leadership"].chip--active   { --chip-accent: #FF4725; }
[data-family="methods-practice"].chip--active      { --chip-accent: #4DB87A; }
[data-family="systems-collaboration"].chip--active { --chip-accent: #5BA3E8; }
[data-family="creative-disciplines"].chip--active  { --chip-accent: #F5A623; }
[data-family="human-context"].chip--active         { --chip-accent: #E578A0; }

.table-summary {
  align-items: center;
  border-bottom: 1px solid var(--divider);
  border-top: 1px solid var(--divider);
  color: var(--text-2);
  display: flex;
  justify-content: space-between;
  min-height: 56px;
  padding: var(--space-3) 0;
}

.text-button {
  background: transparent;
  border: 0;
  color: var(--signal-text);
  cursor: pointer;
  font-weight: 700;
  padding: var(--space-2) 0;
}

/* Family accent colours — inherited by child cards via the cascade */
[data-family-id="futures-technology"]    { --family-accent: #9D90F8; }
[data-family-id="business-leadership"]   { --family-accent: #FF4725; }
[data-family-id="methods-practice"]      { --family-accent: #4DB87A; }
[data-family-id="systems-collaboration"] { --family-accent: #5BA3E8; }
[data-family-id="creative-disciplines"]  { --family-accent: #F5A623; }
[data-family-id="human-context"]         { --family-accent: #E578A0; }

/* Outer section: horizontal scroll wrapper */
.periodic-table {
  -webkit-mask-image: linear-gradient(to right, black 92%, transparent 100%);
  mask-image: linear-gradient(to right, black 92%, transparent 100%);
  overflow-x: auto;
  padding: var(--space-6) 0 var(--space-8);
  -webkit-overflow-scrolling: touch;
}

/* Inner flex row — all families side by side */
.table-inner {
  align-items: start;
  display: flex;
  gap: 10px;
  min-width: max-content;
  padding-bottom: var(--space-4);
}

/* Each family = one vertical block */
.family-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Coloured top bar + family label */
.family-heading {
  border-top: 2px solid var(--family-accent, var(--divider-strong));
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-top: var(--space-2);
}

.family-heading .db-eyebrow {
  color: var(--family-accent, var(--text-3));
}

.family-heading h2 {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.3;
  opacity: 0.5;
  text-transform: none;
  white-space: nowrap;
}

/* Category columns sit in a row inside each family */
.category-grid {
  display: flex;
  gap: 2px;
}

/* Each category = one fixed-width column */
.category-block {
  background: transparent;
  border-radius: 0;
  min-width: 0;
  padding: 0;
  width: 90px;
}

/* Wide column for large categories (> 8 guests) */
.category-block--wide {
  width: 182px; /* 90*2 + 2px gap */
}

.category-block--wide .element-grid {
  display: grid;
  flex-direction: unset;
  gap: 2px;
  grid-template-columns: repeat(2, 90px);
}

/* Ghost column for empty categories */
.category-block--empty {
  opacity: 0.3;
}

.category-block header {
  border-bottom: 0;
  display: block;
  min-height: 0;
  padding: 0 0 var(--space-2) 0;
}

.category-block h3 {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.category-block header span {
  display: none;
}

/* Cards stack vertically inside each category column */
.element-grid {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 0;
}

.element-card {
  background: color-mix(in srgb, var(--family-accent, #333) 7%, #191919);
  border: 1px solid color-mix(in srgb, var(--family-accent, #fff) 10%, transparent);
  border-top: 2px solid var(--family-accent, var(--divider-strong));
  border-radius: 4px;
  color: var(--text-1);
  cursor: pointer;
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  height: 90px;
  padding: 9px;
  text-align: left;
  transition:
    background-color var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-standard);
  width: 90px;
}

.element-card:hover,
.element-card:focus-visible {
  background: color-mix(in srgb, var(--family-accent, #fff) 16%, #222);
  border-color: color-mix(in srgb, var(--family-accent, #fff) 30%, transparent);
  border-top-color: var(--family-accent, var(--divider-strong));
  outline: none;
  transform: translateY(-2px);
}

.element-card--highlight {
  border-color: var(--signal);
  border-top-color: var(--signal);
  box-shadow: inset 0 0 0 1px var(--signal);
}

.element-card--ghost {
  border-style: dashed;
  border-top-style: dashed;
  background: transparent;
  cursor: default;
  pointer-events: none;
}

.element-card__number,
.element-card__category {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.1;
}

.element-card__symbol {
  align-self: center;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 0.9;
}

.element-card__name {
  color: var(--text-1);
  display: -webkit-box;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.15;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.element-card__category {
  display: none;
}

.empty-state {
  align-items: center;
  background: var(--surface-1);
  border-radius: var(--radius-card);
  color: var(--text-2);
  display: grid;
  min-height: 220px;
  place-items: center;
}

.detail-panel {
  inset: 0;
  opacity: 0;
  pointer-events: none;
  position: fixed;
  transition: opacity var(--motion-standard) var(--ease-standard);
  z-index: 20;
}

.detail-panel[aria-hidden="false"] {
  opacity: 1;
  pointer-events: auto;
}

.detail-panel__scrim {
  background: rgba(0, 0, 0, 0.72);
  inset: 0;
  position: absolute;
}

.detail-panel__content {
  background: var(--surface-1);
  border-left: 1px solid var(--divider);
  display: grid;
  grid-template-rows: minmax(220px, 38vh) 1fr;
  height: 100%;
  margin-left: auto;
  max-width: 520px;
  overflow: auto;
  position: relative;
  transform: translateX(24px);
  transition: transform var(--motion-standard) var(--ease-standard);
  width: min(100%, 520px);
}

.detail-panel[aria-hidden="false"] .detail-panel__content {
  transform: translateX(0);
}

.detail-panel__content img {
  background: #111;
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.icon-button {
  align-items: center;
  background: rgba(10, 10, 10, 0.74);
  border: 1px solid var(--divider);
  border-radius: 999px;
  color: var(--text-1);
  cursor: pointer;
  display: grid;
  font-size: 28px;
  height: 40px;
  line-height: 1;
  place-items: center;
  position: absolute;
  right: var(--space-4);
  top: var(--space-4);
  width: 40px;
  z-index: 1;
}

.detail-panel__body {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
}

.detail-panel h2 {
  font-size: clamp(32px, 5vw, 52px);
  line-height: 0.98;
}

#detailSubtitle,
.detail-notes {
  color: var(--text-2);
}

.detail-facts {
  border-bottom: 1px solid var(--divider);
  border-top: 1px solid var(--divider);
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: var(--space-4) 0;
}

.detail-facts div {
  display: grid;
  gap: var(--space-1);
}

.detail-facts dt {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
}

.detail-facts dd {
  font-weight: 700;
  margin: 0;
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.detail-panel .db-primary-button {
  align-self: start;
  display: inline-block;
  justify-self: start;
  line-height: 1;
  padding: 10px 16px;
  width: fit-content;
}

.detail-read-more {
  color: var(--signal-text);
  font-weight: 600;
  white-space: nowrap;
}

@media (max-width: 820px) {
  .app-shell {
    padding: 18px;
  }

  .masthead {
    align-items: start;
    grid-template-columns: 1fr;
  }

  .masthead h1 {
    font-size: clamp(44px, 14vw, 84px);
  }

  .masthead__stat {
    justify-self: start;
  }

  .filter-strip {
    grid-template-columns: 1fr;
  }

  .filter-strip > .chip {
    justify-self: start;
  }

  .filter-strip__items {
    flex-wrap: nowrap;
    max-height: none;
    overflow-x: auto;
    padding-bottom: var(--space-1);
  }

  .table-summary {
    align-items: start;
    flex-direction: column;
  }

  .element-card {
    height: 82px;
    width: 82px;
  }

  .category-block {
    width: 82px;
  }

  .category-block--wide {
    width: 166px;
  }

  .category-block--wide .element-grid {
    grid-template-columns: repeat(2, 82px);
  }
}

@media (max-width: 480px) {
  .masthead p:not(.db-eyebrow) {
    font-size: 18px;
  }

  .detail-panel__body {
    padding: var(--space-4);
  }

  .detail-facts {
    grid-template-columns: 1fr;
  }
}