/* PROOF Liskov Use cases — location, independence, cost. Builds on liskov.css + features.css. */

/* ---------- Hero ---------- */

.usecases-hero .wrap { min-height: 700px; }

.usecases-hero .hero-globe {
  position: absolute;
  top: 0;
  right: -220px;
  height: 100%;
  width: auto;
  opacity: 0.9;
  pointer-events: none;
}

.usecases-hero .features-hero-lede { max-width: 740px; }

.usecases-hero .features-hero-lede strong {
  color: var(--frost);
  font-weight: 700;
}

/* ---------- Three reasons ---------- */

.reasons-section { background: #fff; }

.reasons-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.reason-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 300px;
  padding: 28px;
  border: 1px solid var(--smoke);
  border-radius: 18px;
  background: var(--frost);
  color: inherit;
  text-decoration: none;
  transition: border-color 140ms ease, transform 140ms ease, box-shadow 140ms ease;
}

.reason-card:hover {
  border-color: rgba(255, 106, 44, 0.45);
  transform: translateY(-2px);
  box-shadow: 0 18px 50px rgba(14, 18, 24, 0.08);
}

.reason-index {
  color: var(--stone);
  font: 700 10px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.1em;
}

.reason-card > svg {
  width: 52px;
  height: 52px;
  margin: 34px 0 22px;
  fill: none;
  stroke: var(--beacon);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.reason-card h3 {
  margin: 0;
  font: 700 28px/1.05 "Space Grotesk", sans-serif;
  letter-spacing: -0.035em;
}

.reason-card p {
  margin: 12px 0 20px;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.55;
}

.reason-link {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--smoke);
  color: var(--ink);
  font: 700 12px/1 "Space Grotesk", sans-serif;
}

.reason-link span { color: var(--beacon); transition: transform 140ms ease; display: inline-block; }
.reason-card:hover .reason-link span { transform: translateX(3px); }

/* ---------- Use case cards ---------- */

.usecase-section .section-lede { max-width: 820px; }

.usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.usecase-card {
  display: flex;
  flex-direction: column;
  padding: 30px;
  border: 1px solid var(--smoke);
  border-radius: 18px;
  background: #fff;
}

.usecase-card--future { background: var(--frost); }
.usecase-card--expanding { border-color: rgba(255, 106, 44, 0.3); }

.usecase-card > svg {
  width: 54px;
  height: 54px;
  margin: 32px 0 22px;
  fill: none;
  stroke: var(--beacon);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.usecase-card h3 {
  margin: 0;
  font: 700 26px/1.08 "Space Grotesk", sans-serif;
  letter-spacing: -0.03em;
}

.usecase-card > p {
  margin: 13px 0 0;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.6;
}

.usecase-scenario {
  margin: 18px 0 0 !important;
  padding: 14px 16px;
  border-left: 3px solid var(--beacon);
  border-radius: 0 10px 10px 0;
  background: var(--frost);
  color: var(--ink) !important;
  font-size: 14px !important;
  line-height: 1.55 !important;
}

.usecase-card--future .usecase-scenario { background: #fff; }

.usecase-scenario span {
  display: block;
  margin-bottom: 5px;
  color: var(--beacon);
  font: 700 9.5px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.usecase-card .application-examples {
  margin-top: 20px;
  color: var(--ink);
}

.usecase-needs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: auto 0 0;
  padding: 20px 0 0;
  list-style: none;
}

.usecase-needs li {
  padding: 6px 9px;
  border: 1px solid var(--smoke);
  border-radius: 999px;
  color: var(--steel);
  font: 600 10.5px/1 "Space Grotesk", sans-serif;
}

.usecase-needs li.is-roadmap {
  border-style: dashed;
  border-color: var(--stone);
  color: var(--stone);
}

.usecase-needs li.is-roadmap::after {
  content: " · roadmap";
  font-weight: 500;
}

.usecase-more {
  margin-top: 18px;
  color: var(--ink);
  font: 700 12.5px/1 "Space Grotesk", sans-serif;
  text-decoration: none;
}

.usecase-more span { color: var(--beacon); }
.usecase-more:hover { color: var(--beacon); }

/* ---------- Resilience (dark) ---------- */

.resilience-section { background: var(--ink); color: var(--frost); }
.resilience-section .section-label { color: var(--frost); }
.resilience-section .section-lede { max-width: 860px; color: rgba(247, 248, 250, 0.7); }

.failure-compare {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 56px;
}

.failure-col {
  padding: 30px;
  border-radius: 18px;
}

.failure-col--cloud {
  border: 1px solid rgba(247, 248, 250, 0.12);
  background: rgba(247, 248, 250, 0.035);
}

.failure-col--liskov {
  border: 1px solid rgba(255, 106, 44, 0.4);
  background: rgba(255, 106, 44, 0.08);
}

.failure-col small {
  display: block;
  margin-bottom: 14px;
  font: 700 10px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.failure-col--cloud small { color: var(--stone); }
.failure-col--liskov small { color: var(--beacon); }

.failure-col h3 {
  margin: 0 0 18px;
  font: 700 26px/1.08 "Space Grotesk", sans-serif;
  letter-spacing: -0.03em;
}

.failure-col ul {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.failure-col li {
  position: relative;
  padding-left: 22px;
  color: rgba(247, 248, 250, 0.68);
  font-size: 14.5px;
  line-height: 1.55;
}

.failure-col li strong { color: var(--frost); }

.failure-col li::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.failure-col--cloud li::before { border: 1.5px solid var(--stone); }
.failure-col--liskov li::before { background: var(--beacon); }

.failure-foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(247, 248, 250, 0.14);
  color: rgba(247, 248, 250, 0.6);
  font-size: 13px;
  line-height: 1.5;
}

.usecase-grid--dark .usecase-card {
  border-color: rgba(247, 248, 250, 0.12);
  background: rgba(247, 248, 250, 0.035);
}

.usecase-grid--dark .usecase-card--future { background: rgba(247, 248, 250, 0.015); }
.usecase-grid--dark .usecase-card > p { color: rgba(247, 248, 250, 0.7); }
.usecase-grid--dark .usecase-scenario { background: rgba(247, 248, 250, 0.06); color: rgba(247, 248, 250, 0.9) !important; }
.usecase-grid--dark .application-examples { color: rgba(247, 248, 250, 0.9); }
.usecase-grid--dark .usecase-needs li { border-color: rgba(247, 248, 250, 0.16); color: rgba(247, 248, 250, 0.68); }
.usecase-grid--dark .usecase-needs li.is-roadmap { border-color: rgba(247, 248, 250, 0.3); color: rgba(247, 248, 250, 0.5); }
.usecase-grid--dark .enabler-index { color: rgba(247, 248, 250, 0.4); }
.usecase-grid--dark .enabler-state { border-color: rgba(247, 248, 250, 0.18); color: rgba(247, 248, 250, 0.6); }
.usecase-grid--dark .enabler-state--available { border-color: rgba(63, 202, 122, 0.34); background: rgba(63, 202, 122, 0.13); color: #5ee59a; }
.usecase-grid--dark .enabler-state--available i { background: #5ee59a; }

/* ---------- Fit ---------- */

.fit-section { background: var(--frost); }

.fit-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.fit-card {
  padding: 24px;
  border: 1px solid var(--smoke);
  border-radius: 16px;
  background: #fff;
}

.fit-card--not {
  border-style: dashed;
  border-color: var(--stone);
  background: transparent;
}

.fit-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  background: rgba(39, 181, 101, 0.12);
  color: #15803d;
  font: 700 14px/1 "Space Grotesk", sans-serif;
}

.fit-card--not .fit-mark { background: rgba(144, 152, 166, 0.16); color: var(--steel); }

.fit-card h3 {
  margin: 20px 0 8px;
  font: 700 17px/1.2 "Space Grotesk", sans-serif;
  letter-spacing: -0.02em;
}

.fit-card p {
  margin: 0;
  color: var(--steel);
  font-size: 13.5px;
  line-height: 1.5;
}

.fit-card a { color: var(--ink); font-weight: 700; text-underline-offset: 4px; }

.usecases-cta { background: var(--hull); }

/* ---------- Responsive ---------- */

@media (max-width: 1040px) {
  .fit-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 880px) {
  .usecases-hero .wrap { min-height: 0; }
  .usecases-hero .hero-globe { right: -300px; opacity: 0.55; }
  .reasons-grid,
  .usecase-grid,
  .failure-compare { grid-template-columns: 1fr; }
  .reason-card { min-height: 0; }
  .fit-grid { grid-template-columns: repeat(2, 1fr); }
  .failure-compare { margin-bottom: 40px; }
}

@media (max-width: 600px) {
  .usecase-card,
  .reason-card,
  .failure-col { padding: 24px; }
  .usecase-card h3 { font-size: 23px; }
  .fit-grid { grid-template-columns: 1fr; }
}