/* Spark battery-materials landing — extracted from spark-landing-styles.js */

.spk-root {
  background: var(--mg-paper-0);
  color: var(--mg-ink-1);
  min-height: 100vh;
  font-family: var(--mg-font-sans);
}
.spk-root *  { box-sizing: border-box; }
.spk-root a  { color: inherit; text-decoration: none; }

/* Topbar */
.spk-top {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center;
  gap: 32px; padding: 18px 40px; border-bottom: 1px solid var(--mg-paper-2);
  background: rgba(250,249,246,0.85); backdrop-filter: blur(10px);
  position: sticky; top: 0; z-index: 10;
}
.spk-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mg-font-mono); font-size: 14px; font-weight: 500;
}
.spk-brand__sq {
  width: 14px; height: 14px; background: var(--spark-indigo); border-radius: 3px;
  box-shadow: 0 0 0 3px rgba(91,91,214,0.12);
}
.spk-brand__name    { color: var(--mg-ink-0); }
.spk-brand__dot     { color: var(--spark-indigo); }
.spk-brand__sep     { color: var(--mg-text-dim); margin: 0 4px; }
.spk-brand__product { color: var(--spark-indigo); }
.spk-nav {
  display: flex; gap: 28px; justify-self: center; align-items: baseline;
  font-size: 14px; color: #4e4a5a;
}
.spk-nav a:hover    { color: var(--spark-indigo); }
.spk-nav__soon      { color: var(--mg-text-dim); cursor: default; }
.spk-nav__soon em   {
  font-style: normal; font-size: 11px;
  color: var(--mg-text-dim); letter-spacing: 0.3px; margin-left: 2px;
}
.spk-top__actions   { display: flex; align-items: center; gap: 14px; }
.spk-link           { font-size: 14px; color: #4e4a5a; }
.spk-link:hover     { color: var(--spark-indigo); }
.spk-link--ind      { color: var(--spark-indigo); font-family: var(--mg-font-mono); font-size: 13px; }

.spk-btn {
  display: inline-flex; align-items: center;
  padding: 9px 14px;
  background: var(--spark-indigo); color: #fff; border-radius: 6px;
  font-size: 13px; font-weight: 500; border: none; cursor: pointer;
  transition: background .25s var(--mg-ease);
  font-family: inherit;
}
.spk-btn:hover     { background: var(--spark-indigo-2); }
.spk-btn--sm       { padding: 7px 12px; font-size: 12px; }
.spk-btn--lg       { padding: 14px 22px; font-size: 15px; }

/* Hero */
.spk-hero {
  display: grid; grid-template-columns: 1fr 1.8fr; gap: 64px;
  max-width: 1480px; margin: 0 auto; padding: 80px 40px 64px; align-items: center;
}
.spk-hero__eyebrow {
  font-family: var(--mg-font-mono); font-size: 13px;
  color: var(--mg-text-dim); margin-bottom: 28px; letter-spacing: 0.5px;
}
.spk-hero__title {
  font-family: var(--mg-font-mono); font-size: clamp(40px, 5.2vw, 76px);
  line-height: 1; letter-spacing: -3px; font-weight: 500; margin: 0 0 28px;
  color: var(--mg-ink-0);
}
.spk-hero__title--ind { color: var(--spark-indigo); }
.spk-hero__sub        { font-size: 17px; line-height: 1.55; color: #4e4a5a; max-width: 50ch; margin: 0 0 36px; }
.spk-hero__metrics    {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  padding-top: 24px; border-top: 1px solid var(--mg-paper-2);
}
.spk-metric__num { font-family: var(--mg-font-mono); font-size: 24px; font-weight: 500; color: var(--mg-ink-0); letter-spacing: -0.5px; }
.spk-metric__lbl { font-size: 12px; color: #6c6b7a; margin-top: 4px; }

/* Periodic table */
.spk-hero__pt-wrap {
  background: #fff; border: 1px solid var(--mg-paper-2);
  border-radius: 16px; padding: 22px;
  box-shadow: 0 24px 60px rgba(13,12,16,0.04);
}
.spk-hero__pt-label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mg-font-mono); font-size: 11px; letter-spacing: 1.5px;
  color: var(--mg-text-dim); text-transform: uppercase; margin-bottom: 14px;
}
.spk-hero__pt-cur { color: var(--spark-indigo); text-transform: none; letter-spacing: 0; font-size: 12px; }
.spk-pt {
  display: grid;
  /* minmax(0, 1fr) so cells can shrink below their intrinsic content size;
     without this the 18-column grid blows out past its parent at narrower
     viewports and the right side of the table gets clipped. */
  grid-template-columns: repeat(18, minmax(0, 1fr));
  gap: 2px;
  grid-template-rows: repeat(7, minmax(0, 1fr)) 6px repeat(2, minmax(0, 1fr));
  font-family: var(--mg-font-mono);
}
.spk-pt__c {
  position: relative;
  aspect-ratio: 1; padding: 3px; border-radius: 3px;
  display: flex; flex-direction: column; justify-content: space-between;
  transition: transform .2s var(--mg-ease), box-shadow .2s var(--mg-ease);
  cursor: pointer;
  border: 0; color: inherit; font: inherit; text-align: left;
}
.spk-pt__c:hover   { transform: scale(1.15); z-index: 2; box-shadow: 0 4px 14px rgba(0,0,0,0.2); }

/* Instant CSS tooltip on element hover (replaces native title's ~700ms delay). */
.spk-pt__c[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  left: 50%; bottom: calc(100% + 6px);
  transform: translateX(-50%);
  padding: 4px 8px;
  background: var(--mg-ink-0); color: #fff;
  font-family: var(--mg-font-mono); font-size: 11px;
  letter-spacing: 0.2px; line-height: 1; white-space: nowrap;
  border-radius: 4px;
  opacity: 0; pointer-events: none;
  transition: opacity .12s var(--mg-ease);
  z-index: 3;
}
.spk-pt__c[data-tip]:hover::after { opacity: 1; }
.spk-pt__num       { font-size: 6px; line-height: 1; opacity: 0.7; }
.spk-pt__sym       { font-size: 11px; font-weight: 500; line-height: 1; }
.spk-pt__refsym    { font-size: 8px; font-weight: 500; line-height: 1; opacity: 0.95; }
.spk-pt__c--ref    { opacity: 0.8; justify-content: center; align-items: center; text-align: center; cursor: default; }
.spk-pt__name      {
  font-size: 5px; line-height: 1; opacity: 0.7;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.spk-hero__legend  {
  display: flex; gap: 18px; flex-wrap: wrap; margin-top: 16px;
  font-size: 11px; color: #6c6b7a;
}
.spk-hero__legend span { display: flex; align-items: center; gap: 6px; }
.spk-hero__legend i    { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }

/* Search */
.spk-search { max-width: 1480px; margin: 0 auto; padding: 0 40px 24px; }
.spk-search__bar {
  display: flex; align-items: center; gap: 10px;
  background: #fff; border: 1px solid var(--mg-paper-2); border-radius: 10px;
  padding: 8px 12px; box-shadow: 0 4px 16px rgba(13,12,16,0.04);
}
.spk-search__bar svg   { color: var(--mg-text-dim); flex-shrink: 0; }
.spk-search__bar input {
  flex: 1; border: none; background: transparent; outline: none;
  font-family: var(--mg-font-mono); font-size: 14px; color: var(--mg-ink-0);
  padding: 8px 0;
}
.spk-search__bar kbd {
  font-family: var(--mg-font-mono); font-size: 11px;
  padding: 3px 7px; background: var(--mg-paper-1); border: 1px solid var(--mg-paper-2);
  border-radius: 4px; color: var(--mg-text-dim);
}
.spk-search__filters { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 14px; }
.spk-chip {
  padding: 5px 11px; border-radius: 999px; border: 1px solid var(--mg-paper-2);
  background: #fff; font-size: 12px; font-family: var(--mg-font-mono);
  color: #4e4a5a; cursor: pointer; transition: all .2s var(--mg-ease);
}
.spk-chip:hover     { border-color: var(--spark-indigo); color: var(--spark-indigo); }
.spk-chip--on       { background: var(--spark-indigo); color: #fff; border-color: var(--spark-indigo); }
.spk-chip--on:hover { color: #fff; background: var(--spark-indigo-2); }
.spk-search__hint  { margin-left: 8px; font-size: 12px; color: var(--mg-text-dim); }
.spk-search__hint code {
  font-family: var(--mg-font-mono); background: var(--mg-paper-1);
  padding: 1px 5px; border-radius: 3px;
}

/* Table */
.spk-table-wrap { max-width: 1480px; margin: 0 auto; padding: 32px 40px 64px; }
.spk-table-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: 24px; padding-bottom: 14px; border-bottom: 1px solid var(--mg-paper-2);
}
.spk-table__lbl {
  font-family: var(--mg-font-mono); font-size: 11px; letter-spacing: 1.5px;
  color: var(--spark-indigo); text-transform: uppercase; margin-bottom: 8px;
}
.spk-table__title {
  font-family: var(--mg-font-mono); font-size: clamp(22px, 2vw, 30px);
  font-weight: 500; letter-spacing: -1px; margin: 0; color: var(--mg-ink-0);
}
.spk-table-head__right { display: flex; align-items: center; gap: 16px; }
.spk-pill {
  font-family: var(--mg-font-mono); font-size: 12px; padding: 6px 11px;
  background: var(--mg-paper-1); border-radius: 999px; color: #4e4a5a;
}
.spk-pill b { color: var(--mg-ink-0); }

.spk-table {
  background: #fff; border: 1px solid var(--mg-paper-2); border-radius: 10px;
  font-family: var(--mg-font-mono); font-size: 12px;
  position: relative;
}
.spk-table[aria-busy="true"]::after {
  content: ""; position: absolute; inset: 0;
  background: rgba(255,255,255,0.6); pointer-events: none;
  border-radius: 10px;
}
.spk-table__row {
  display: grid;
  /* minmax(0, …fr) lets long material formulas shrink/wrap instead of blowing
     out column 1 and shifting every subsequent column right. */
  grid-template-columns:
    minmax(0, 1.6fr) minmax(0, 0.85fr) minmax(0, 0.7fr) minmax(0, 0.55fr)
    minmax(0, 0.55fr) minmax(0, 0.7fr) minmax(0, 0.85fr) minmax(0, 0.7fr)
    minmax(0, 0.7fr) minmax(0, 0.85fr) minmax(0, 0.5fr);
  gap: 12px; padding: 14px 18px;
  align-items: start; border-bottom: 1px solid var(--mg-paper-1);
  transition: background .2s var(--mg-ease);
}
.spk-table__row > div { min-width: 0; }
.spk-table__row:last-child { border-bottom: none; border-bottom-left-radius: 9px; border-bottom-right-radius: 9px; }
.spk-table__row:hover      { background: var(--mg-paper-1); }
.spk-table__row--head      {
  background: var(--mg-paper-1);
  color: var(--mg-text-dim); text-transform: uppercase; letter-spacing: 1px;
  font-size: 10px; font-weight: 500; padding: 12px 18px;
  align-items: end;
  border-top-left-radius: 9px; border-top-right-radius: 9px;
}
.spk-table__row--head:hover { background: var(--mg-paper-1); }
.spk-table__row--head small {
  display: block; text-transform: none; letter-spacing: 0;
  color: var(--mg-text-dim); opacity: 0.7; font-size: 9px; margin-top: 2px;
}
.spk-mat       { position: relative; min-width: 0; }
.spk-mat__main {
  color: var(--mg-ink-0); font-weight: 500;
  word-break: break-word; overflow-wrap: anywhere;
}
.spk-mat__sub  {
  font-size: 10px; color: var(--mg-text-dim); margin-top: 3px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
/* Instant CSS tooltip for the truncated sub-formula list — anchored on the
   parent .spk-mat so the ::after isn't clipped by .spk-mat__sub's
   overflow:hidden (which the ellipsis depends on). */
.spk-mat[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  left: 0; bottom: calc(100% + 6px);
  padding: 6px 10px;
  background: var(--mg-ink-0); color: #fff;
  font-family: var(--mg-font-mono); font-size: 11px;
  line-height: 1.45; white-space: normal;
  max-width: 480px; width: max-content;
  border-radius: 4px;
  opacity: 0; pointer-events: none;
  transition: opacity .12s var(--mg-ease);
  z-index: 5;
}
.spk-mat[data-tip]:hover::after { opacity: 1; }
.spk-tag {
  display: inline-block; padding: 2px 7px; border-radius: 3px;
  font-size: 10px; font-weight: 500; letter-spacing: 0.3px;
}
.spk-tag--liion    { background: rgba(228,165,40,0.15);  color: #a07820; }
.spk-tag--naion    { background: rgba(91,91,214,0.12);   color: var(--spark-indigo); }
.spk-tag--kion     { background: rgba(72,72,191,0.12);   color: var(--spark-indigo-2); }
.spk-tag--flow     { background: rgba(47,152,102,0.12);  color: #2f7a52; }
.spk-tag--solidstate { background: rgba(108,74,214,0.12); color: #6c4ad6; }
.spk-tag--default  { background: var(--mg-paper-1); color: #4e4a5a; }
.spk-doi           { color: var(--spark-indigo); }
.spk-doi:hover     { text-decoration: underline; }

.spk-empty { padding: 40px 18px; text-align: center; color: var(--mg-text-dim); font-size: 12px; }

/* Features */
.spk-features          { background: var(--mg-paper-1); padding: 96px 40px; }
.spk-features__head    { max-width: 1480px; margin: 0 auto 48px; }
.spk-features__title   {
  font-family: var(--mg-font-mono); font-size: clamp(28px, 3.5vw, 48px);
  line-height: 1.1; letter-spacing: -1.5px; font-weight: 500; margin: 8px 0 0;
  color: var(--mg-ink-0);
}
.spk-features__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  max-width: 1480px; margin: 0 auto;
  background: var(--mg-paper-2); border: 1px solid var(--mg-paper-2); border-radius: 10px; overflow: hidden;
}
.spk-feat        { background: var(--mg-paper-0); padding: 28px; }
.spk-feat__num   { font-family: var(--mg-font-mono); font-size: 12px; color: var(--spark-indigo); letter-spacing: 1.5px; margin-bottom: 14px; }
.spk-feat__title { font-family: var(--mg-font-mono); font-size: 18px; font-weight: 500; letter-spacing: -0.5px; margin-bottom: 10px; color: var(--mg-ink-0); }
.spk-feat__sub   { font-size: 14px; color: #4e4a5a; line-height: 1.55; }

/* CTA */
.spk-cta { padding: 96px 40px; }
.spk-cta__inner {
  max-width: 1280px; margin: 0 auto;
  background: linear-gradient(135deg, var(--spark-indigo) 0%, var(--spark-cobalt) 100%);
  border-radius: 16px; padding: 56px 48px;
  display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: center;
  color: #fff; position: relative; overflow: hidden;
}
.spk-cta__inner::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.12), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(228,165,40,0.18), transparent 50%);
  pointer-events: none;
}
.spk-cta > *      { position: relative; }
.spk-cta__lbl     { font-family: var(--mg-font-mono); font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase; opacity: 0.8; margin-bottom: 16px; }
.spk-cta__h       { font-family: var(--mg-font-mono); font-size: clamp(28px, 3.5vw, 44px); letter-spacing: -1.5px; font-weight: 500; margin: 0 0 12px; }
.spk-cta p        { opacity: 0.85; font-size: 15px; margin: 0; }
.spk-cta__form    { display: flex; gap: 8px; align-items: center; }
.spk-cta__form input {
  background: rgba(255,255,255,0.95); color: var(--mg-ink-0);
  border: none; border-radius: 6px; padding: 14px 18px;
  font-family: var(--mg-font-mono); font-size: 14px; width: 260px; outline: none;
}
.spk-cta__form .spk-btn       { background: var(--mg-ink-0); color: #fff; padding: 14px 22px; }
.spk-cta__form .spk-btn:hover { background: #000; }

/* Footer */
.spk-foot {
  display: grid; grid-template-columns: 1.8fr 1fr 1fr; gap: 32px;
  padding: 56px 40px; max-width: 1480px; margin: 0 auto;
  border-top: 1px solid var(--mg-paper-2);
}
.spk-foot__soon { font-size: 13px; color: #4e4a5a; }
.spk-foot__soon em {
  font-style: normal; font-size: 11px;
  color: var(--mg-text-dim); letter-spacing: 0.3px;
}
.spk-foot__col       { display: flex; flex-direction: column; gap: 8px; }
.spk-foot__col p     { font-size: 13px; color: #6c6b7a; margin: 12px 0 0; line-height: 1.5; max-width: 32ch; }
.spk-foot__brand     { display: flex; align-items: center; gap: 8px; font-family: var(--mg-font-mono); font-size: 14px; font-weight: 500; }
.spk-foot__lbl       { font-family: var(--mg-font-mono); font-size: 11px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--mg-text-dim); margin-bottom: 6px; }
.spk-foot__col a     { font-size: 13px; color: #4e4a5a; }
.spk-foot__col a:hover { color: var(--spark-indigo); }

/* ============================== Responsive ============================== */

/* Stack the hero earlier — the 18-column periodic table needs more room than
   the side-by-side layout offers once the viewport drops below ~1100px. */
@media (max-width: 1100px) {
  .spk-hero          { grid-template-columns: 1fr; gap: 36px; padding: 64px 40px 40px; }
  .spk-hero__sub     { max-width: none; }
  .spk-hero__pt-wrap { max-width: 720px; width: 100%; margin: 0 auto; }
}

/* Tablet (<= 980px): trim the topbar, hide nav, drop search hints. */
@media (max-width: 980px) {
  .spk-top             { grid-template-columns: 1fr auto; gap: 16px; padding: 14px 20px; }
  .spk-nav             { display: none; }
  .spk-hero            { padding: 48px 20px 32px; }
  .spk-search          { padding: 0 20px 16px; }
  .spk-search__filters { gap: 4px; }
  .spk-search__hint    { display: none; }
  .spk-table-wrap      { padding: 24px 20px; }
  .spk-features        { padding: 64px 20px; }
  .spk-features__grid  { grid-template-columns: 1fr 1fr; }
  .spk-foot            { grid-template-columns: 1fr 1fr; padding: 40px 20px; }
}

/* Mobile (<= 640px): hide the periodic table; stack everything; collapse the
   data table to the 5 columns that matter (Material / Capacity / Cycles /
   Type / Source) so it fits the viewport without horizontal scroll. */
@media (max-width: 640px) {
  .spk-hero__pt-wrap     { display: none; }
  .spk-hero              { padding: 32px 20px 16px; gap: 20px; }
  .spk-hero__title       { font-size: clamp(34px, 10vw, 52px); letter-spacing: -2px; }
  .spk-hero__sub         { font-size: 15px; margin-bottom: 24px; }
  .spk-hero__metrics     { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .spk-metric__num       { font-size: 18px; }
  .spk-metric__lbl       { font-size: 11px; }
  .spk-search__bar kbd   { display: none; }
  .spk-search__bar input { font-size: 13px; }
  .spk-table-wrap        { padding: 24px 16px; }
  .spk-table-head        { flex-direction: column; align-items: flex-start; gap: 8px; }
  .spk-table-head__right { display: none; }
  .spk-table__title      { font-size: 20px; }
  .spk-table             { font-size: 11px; }
  .spk-table__row,
  .spk-table__row--head  {
    grid-template-columns:
      minmax(0, 1.7fr)   /* Material   */
      minmax(0, 0.7fr)   /* Capacity   */
      minmax(0, 0.6fr)   /* Cycles     */
      minmax(0, 0.8fr)   /* Type       */
      minmax(0, 0.5fr);  /* Source     */
    gap: 8px;
    padding: 12px 14px;
    min-width: 0;
  }
  /* Hide the columns that don't earn their place at this size. Indices
     match the source order: 3=Current, 5=Voltage, 6=Retention, 7=Electrode,
     9=E-density, 10=Pub date. */
  .spk-table__row > :nth-child(3),
  .spk-table__row > :nth-child(5),
  .spk-table__row > :nth-child(6),
  .spk-table__row > :nth-child(7),
  .spk-table__row > :nth-child(9),
  .spk-table__row > :nth-child(10) { display: none; }

  .spk-mat__main         { font-size: 11px; }
  .spk-mat__sub          { display: none; }

  .spk-features          { padding: 48px 20px; }
  .spk-features__grid    { grid-template-columns: 1fr; }
  .spk-features__title   { font-size: 22px; }
  .spk-foot              { grid-template-columns: 1fr; padding: 32px 20px; gap: 24px; }
}