/* =========================================================================
   Serenio — "How it works": the AI, the methods, safety and data
   ========================================================================= */

/* on-this-page index */
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}
.toc a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 1rem;
  border-radius: var(--r-pill);
  border: 1px solid rgba(136, 117, 180, 0.22);
  background: rgba(255, 252, 248, 0.75);
  font-size: var(--text-label);
  font-weight: 600;
  color: var(--plum);
  transition: border-color var(--dur-control) var(--ease-entry),
    background-color var(--dur-control) var(--ease-entry);
}
.toc a:hover {
  border-color: rgba(136, 117, 180, 0.55);
  background: rgba(255, 252, 248, 0.95);
}
.how-section {
  scroll-margin-top: 84px;
}

/* -------------------------------------------------------------------------
   The short version — four plain statements
   ------------------------------------------------------------------------- */
.short {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.short__item {
  padding: clamp(1.6rem, 1.2rem + 1.2vw, 2.4rem);
  border-radius: var(--r-panel);
  background: rgba(255, 252, 248, 0.76);
  border: 1px solid var(--ring-highlight);
  box-shadow: var(--shadow-control);
}
.short__item:first-child {
  background: linear-gradient(155deg, #efe9f5, #f7f2f1 70%);
  box-shadow: var(--shadow-soft);
}
.short__item h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.55rem, 1.25rem + 1.1vw, 2.05rem);
  line-height: 1.12;
  color: var(--ink);
}
.short__item p {
  margin-top: 0.8rem;
  color: var(--ink-muted);
  line-height: 1.65;
}
@media (max-width: 700px) {
  .short {
    grid-template-columns: 1fr;
  }
}

/* -------------------------------------------------------------------------
   Pipeline — what happens to every message
   ------------------------------------------------------------------------- */
.pipeline {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 1rem + 4vw, 5rem);
  align-items: start;
}
.pipeline__aside {
  position: sticky;
  top: 96px;
}
.pipeline__aside .lead {
  margin-top: 1rem;
}
.evidence {
  margin: 2rem 0 0;
  max-width: 340px;
}
.evidence img {
  width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow: 0 34px 70px -34px rgba(46, 34, 72, 0.45);
}
.evidence figcaption {
  margin-top: 0.9rem;
  font-size: var(--text-label);
  color: var(--ink-muted);
  line-height: 1.55;
}
.steps {
  position: relative;
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps::before {
  content: "";
  position: absolute;
  top: 1.6rem;
  bottom: 1.6rem;
  left: 1.55rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(167, 207, 190, 0.9), rgba(136, 117, 180, 0.35));
}
.step {
  position: relative;
  display: grid;
  grid-template-columns: 3.1rem 1fr;
  gap: 1.1rem;
  padding: 1.4rem 1.5rem 1.4rem 0;
}
.step__num {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 3.1rem;
  height: 3.1rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid rgba(136, 117, 180, 0.28);
  box-shadow: var(--shadow-control);
  font-family: var(--font-sans);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-size: 1rem;
  color: var(--plum);
}
.step--safety .step__num {
  background: #e6f1eb;
  border-color: rgba(63, 122, 100, 0.35);
  color: var(--sage-ink);
}
.step__kicker {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-size: var(--text-caption);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sage-ink);
}
.step h3 {
  color: var(--ink);
  margin-top: 0.55rem;
}
.step p {
  margin-top: 0.55rem;
  color: var(--ink-muted);
  line-height: 1.68;
}
@media (max-width: 900px) {
  .pipeline {
    grid-template-columns: 1fr;
  }
  .pipeline__aside {
    position: static;
  }
  .evidence {
    display: none;
  }
}

/* -------------------------------------------------------------------------
   Methods table
   ------------------------------------------------------------------------- */
.methods {
  border-radius: var(--r-panel);
  background: rgba(255, 252, 248, 0.8);
  border: 1px solid var(--ring-highlight);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.methods table {
  width: 100%;
  border-collapse: collapse;
}
.methods caption {
  padding: 1.3rem 1.6rem 0.2rem;
  text-align: start;
  font-size: var(--text-label);
  color: var(--ink-faint);
}
.methods th,
.methods td {
  padding: 1rem 1.3rem;
  text-align: start;
  vertical-align: top;
  border-bottom: 1px solid rgba(136, 117, 180, 0.12);
  line-height: 1.5;
}
.methods thead th {
  font-size: var(--text-caption);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--violet-ink);
  background: rgba(237, 231, 243, 0.55);
}
.methods tbody th {
  width: 28%;
  font-weight: 600;
  color: var(--plum);
}
.methods td {
  color: var(--ink-muted);
}
.methods td:nth-child(2) {
  color: var(--ink);
}
.methods tbody tr:last-child > * {
  border-bottom: 0;
}
.methods tbody tr:hover > * {
  background: rgba(237, 231, 243, 0.3);
}
.cite {
  margin-inline-start: 0.2em;
  font-size: 0.78em;
  font-weight: 600;
  color: var(--violet-ink);
  white-space: nowrap;
}
.cite:hover {
  text-decoration: underline;
}
.methods__note {
  margin-top: 1.4rem;
  max-width: 70ch;
  padding-inline-start: 1rem;
  border-inline-start: 3px solid var(--sage);
  color: var(--ink-muted);
  line-height: 1.68;
}
@media (max-width: 760px) {
  .methods thead {
    display: none;
  }
  .methods table,
  .methods tbody,
  .methods tr,
  .methods th,
  .methods td {
    display: block;
    width: 100%;
  }
  .methods tbody tr {
    padding: 1.1rem 1.2rem;
    border-bottom: 1px solid rgba(136, 117, 180, 0.12);
  }
  .methods tbody tr:last-child {
    border-bottom: 0;
  }
  .methods tbody th,
  .methods td {
    width: 100%;
    padding: 0;
    border: 0;
  }
  .methods td {
    margin-top: 0.7rem;
  }
  .methods caption {
    display: block;
  }
  .methods .m-label {
    display: block;
    margin-bottom: 0.1rem;
    font-size: var(--text-caption);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
  }
}
.m-label {
  display: none;
}

/* -------------------------------------------------------------------------
   Hard moments
   ------------------------------------------------------------------------- */
.safety {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 1rem + 4vw, 4.5rem);
  align-items: start;
}
.safety__points {
  display: grid;
  gap: 1.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.safety__points li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
}
.safety__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(167, 207, 190, 0.3);
  color: var(--sage-ink);
}
.safety__icon svg {
  width: 22px;
  height: 22px;
}
.safety__points h3 {
  color: var(--ink);
}
.safety__points p {
  margin-top: 0.45rem;
  color: var(--ink-muted);
  line-height: 1.68;
}
.safety__shot {
  position: sticky;
  top: 96px;
  margin: 0;
}
.safety__shot .device-browser {
  position: relative;
}
.safety__shot .device-browser::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 22%;
  background: linear-gradient(to top, var(--canvas), rgba(250, 247, 242, 0));
}
.safety__shot figcaption {
  margin-top: 0.9rem;
  font-size: var(--text-label);
  color: var(--ink-muted);
}
.safety__shot figcaption a {
  color: var(--plum);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.callout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  margin-top: clamp(2rem, 1.5rem + 2vw, 3rem);
  padding: clamp(1.3rem, 1rem + 1vw, 1.8rem);
  border-radius: var(--r-media);
  background: rgba(232, 200, 206, 0.28);
  border: 1px solid rgba(169, 78, 98, 0.28);
}
.callout svg {
  width: 26px;
  height: 26px;
  color: var(--danger);
}
.callout h3 {
  color: var(--rose-ink);
}
.callout p {
  margin-top: 0.4rem;
  color: var(--ink);
  line-height: 1.65;
}
@media (max-width: 900px) {
  .safety {
    grid-template-columns: 1fr;
  }
  .safety__shot {
    position: static;
    max-width: 560px;
  }
}

/* -------------------------------------------------------------------------
   Data — three answers + the processor list
   ------------------------------------------------------------------------- */
.data-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.data-card {
  padding: clamp(1.5rem, 1.2rem + 1vw, 2.1rem);
  border-radius: var(--r-panel);
  background: rgba(255, 252, 248, 0.78);
  border: 1px solid var(--ring-highlight);
  box-shadow: var(--shadow-control);
}
.data-card h3 {
  margin-top: 1rem;
  color: var(--ink);
}
.data-card p {
  margin-top: 0.55rem;
  color: var(--ink-muted);
  line-height: 1.66;
}
.data-card .tile__icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: rgba(136, 117, 180, 0.12);
  color: var(--plum);
}
.data-card .tile__icon svg {
  width: 22px;
  height: 22px;
}
.processors {
  margin-top: 1.4rem;
  border-radius: var(--r-panel);
  border: 1px solid var(--ring-highlight);
  background: rgba(255, 252, 248, 0.7);
  overflow-x: auto;
}
.processors table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.processors caption {
  padding: 1.2rem 1.4rem 0.4rem;
  text-align: start;
  font-weight: 600;
  color: var(--ink);
}
.processors th,
.processors td {
  padding: 0.85rem 1.4rem;
  text-align: start;
  vertical-align: top;
  border-bottom: 1px solid rgba(136, 117, 180, 0.12);
  line-height: 1.5;
}
.processors thead th {
  font-size: var(--text-caption);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--violet-ink);
}
@media (max-width: 760px) {
  /* stack the processor rows so "Where" is never off-screen */
  .processors {
    overflow: visible;
  }
  .processors table {
    min-width: 0;
  }
  .processors thead {
    display: none;
  }
  .processors caption {
    display: block;
  }
  .processors table,
  .processors tbody,
  .processors tr,
  .processors th,
  .processors td {
    display: block;
    width: 100%;
  }
  .processors tr {
    padding: 0.9rem 1.2rem;
    border-bottom: 1px solid rgba(136, 117, 180, 0.12);
  }
  .processors tbody tr:last-child {
    border-bottom: 0;
  }
  .processors th,
  .processors td {
    padding: 0.1rem 0;
    border: 0;
  }
  .processors td:last-child {
    color: var(--ink);
    font-weight: 500;
  }
}
.processors tbody th {
  font-weight: 600;
  color: var(--ink);
}
.processors td {
  color: var(--ink-muted);
}
.processors tbody tr:last-child > * {
  border-bottom: 0;
}
.promises {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.6rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}
.promises li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--ink);
}
.promises li::before {
  content: "";
  width: 1.1rem;
  height: 1.1rem;
  background: var(--sage-ink);
  -webkit-mask: var(--icon-check) center / contain no-repeat;
  mask: var(--icon-check) center / contain no-repeat;
}
.fine {
  margin-top: 1rem;
  font-size: var(--text-label);
  color: var(--ink-faint);
  line-height: 1.6;
}
.fine a {
  color: var(--plum);
  text-decoration: underline;
  text-underline-offset: 3px;
}
@media (max-width: 900px) {
  .data-cards {
    grid-template-columns: 1fr;
  }
}

/* -------------------------------------------------------------------------
   Testing + limits (two-up) and references
   ------------------------------------------------------------------------- */
.twoup {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.panel {
  padding: clamp(1.6rem, 1.2rem + 1.5vw, 2.6rem);
  border-radius: var(--r-panel);
  border: 1px solid var(--ring-highlight);
  box-shadow: var(--shadow-control);
  background: rgba(255, 252, 248, 0.76);
}
.panel--limits {
  background: linear-gradient(160deg, #f6eef0, #f7f3f1 70%);
}
.panel h2 {
  margin-top: 0.7rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-h2);
  line-height: 1.15;
}
.panel ul {
  display: grid;
  gap: 0.9rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}
.panel li {
  position: relative;
  padding-inline-start: 1.4rem;
  color: var(--ink-muted);
  line-height: 1.62;
}
.panel li::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--violet);
}
.panel--limits li::before {
  background: var(--danger);
  opacity: 0.7;
}
@media (max-width: 860px) {
  .twoup {
    grid-template-columns: 1fr;
  }
}
.refs {
  display: grid;
  gap: 0.7rem;
  max-width: 78ch;
  margin: 0;
  padding-inline-start: 1.6rem;
  font-size: 0.92rem;
  color: var(--ink-muted);
  line-height: 1.6;
}
.refs li {
  padding-inline-start: 0.3rem;
  scroll-margin-top: 96px;
}
.refs li:target {
  color: var(--ink);
  background: rgba(216, 200, 234, 0.35);
  border-radius: 8px;
}
.refs em {
  color: var(--ink);
}