.page-faq {
  position: relative;
  overflow-x: clip;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-faq section[id] {
  scroll-margin-top: calc(var(--bar-h) + 16px);
}

.page-faq .faq-topbar {
  padding-top: clamp(20px, 3vw, 34px);
}

/* ---------- hero ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-bottom: clamp(36px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  left: -6%;
  right: 42%;
  top: 46%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent));
  transform: rotate(-9deg);
  transform-origin: left center;
  opacity: 0.5;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
  padding-top: clamp(26px, 4vw, 52px);
  position: relative;
}

.page-faq .faq-hero__col {
  min-width: 0;
}

.page-faq .faq-hero .kicker {
  display: inline-block;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
  text-transform: uppercase;
}

.page-faq .faq-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(38px, 7.4vw, 78px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.85;
  color: rgba(242, 240, 232, 0.84);
}

.page-faq .faq-hero__note {
  margin: 0;
  max-width: 62ch;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 240, 232, 0.66);
}

.page-faq .faq-hero__index {
  align-self: start;
  min-width: 0;
}

.page-faq .faq-hero__index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--rock);
}

.page-faq .faq-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-toc li {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-toc a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  padding: 11px 2px;
  color: rgba(242, 240, 232, 0.86);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-faq .faq-toc a:hover,
.page-faq .faq-toc a:focus-visible {
  color: var(--accent);
  padding-left: 8px;
}

.page-faq .faq-toc__i {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

/* ---------- sections ---------- */
.page-faq .faq-sec {
  padding: clamp(46px, 6.5vw, 84px) 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-sec--last {
  border-bottom: 0;
}

.page-faq .section-head {
  margin-bottom: clamp(26px, 3.4vw, 46px);
  max-width: 72ch;
}

.page-faq .section-head .kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--rock);
  text-transform: uppercase;
}

.page-faq .faq-sec__n {
  color: var(--accent);
}

.page-faq .section-head h2 {
  margin: 0 0 14px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-faq .faq-lead {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 240, 232, 0.76);
}

/* ---------- steps ---------- */
.page-faq .step-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-faq .step {
  position: relative;
  padding: clamp(20px, 3vw, 28px) clamp(18px, 2.6vw, 26px);
  background: linear-gradient(158deg, rgba(24, 58, 82, 0.92), rgba(16, 41, 61, 0.74));
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-faq .step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 2px;
  background: var(--accent);
}

.page-faq .step__num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-faq .step__title {
  margin: 0 0 10px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 240, 232, 0.8);
}

.page-faq .step__hint {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--acid);
}

/* ---------- ui map ---------- */
.page-faq .ui-map {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
}

.page-faq .ui-map__shot {
  margin: 0;
  padding: 10px;
  background: var(--ink-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
}

.page-faq .ui-map__shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1px;
}

.page-faq .ui-map__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--rock);
}

.page-faq .zone-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .zone {
  position: relative;
  padding: 14px 16px 14px 20px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-faq .zone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: var(--accent);
  opacity: 0.75;
}

.page-faq .zone__name {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .zone__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(242, 240, 232, 0.78);
}

/* ---------- steal read ---------- */
.page-faq .read-grid {
  display: grid;
  gap: 14px;
}

.page-faq .concept {
  padding: clamp(16px, 2.2vw, 22px);
  background: rgba(10, 27, 42, 0.72);
  border: 1px solid var(--line);
  border-top: 2px solid var(--ink-3);
  border-radius: var(--r);
}

.page-faq .concept__key {
  margin: 0 0 8px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--acid);
}

.page-faq .concept__val {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(242, 240, 232, 0.8);
}

.page-faq .demo {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(20px, 3vw, 34px);
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(140deg, rgba(24, 58, 82, 0.9), rgba(10, 27, 42, 0.96));
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
}

.page-faq .demo__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-faq .demo__team {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .demo__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.page-faq .demo__fig {
  padding: 12px 14px;
  background: rgba(10, 27, 42, 0.6);
  border-left: 2px solid var(--accent);
}

.page-faq .demo__fig--acid {
  border-left-color: var(--acid);
}

.page-faq .demo__fig b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-faq .demo__fig i {
  display: block;
  margin-top: 4px;
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-faq .demo__read {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 240, 232, 0.82);
}

/* ---------- round find ---------- */
.page-faq .narrow {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-faq .narrow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-faq .narrow__item {
  position: relative;
  padding: 18px 0 18px 54px;
  border-bottom: 1px solid var(--line);
}

.page-faq .narrow__item:first-child {
  padding-top: 0;
}

.page-faq .narrow__i {
  position: absolute;
  left: 0;
  top: 18px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
}

.page-faq .narrow__item:first-child .narrow__i {
  top: 0;
}

.page-faq .narrow__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 22px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .narrow__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(242, 240, 232, 0.78);
}

.page-faq .narrow__side {
  align-self: start;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-faq .narrow__side-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--rock);
}

.page-faq .narrow__side-code {
  margin: 0 0 14px;
  padding: 14px 16px;
  background: rgba(10, 27, 42, 0.86);
  border-left: 2px solid var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 2;
  color: var(--acid);
}

.page-faq .narrow__side-hint {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(242, 240, 232, 0.64);
}

.page-faq .round-jump {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 74ch;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 240, 232, 0.78);
}

/* ---------- qa ---------- */
.page-faq .qa-group {
  margin-bottom: clamp(26px, 3.6vw, 40px);
}

.page-faq .qa-group:last-child {
  margin-bottom: 0;
}

.page-faq .qa-group__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 22px);
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .qa-group__title::before {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--orange);
}

.page-faq .qa {
  margin-bottom: 8px;
  background: rgba(16, 41, 61, 0.6);
  border: 1px solid var(--line);
  border-left: 2px solid transparent;
  border-radius: var(--r);
  transition: border-left-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .qa[open] {
  border-left-color: var(--accent);
  background: rgba(24, 58, 82, 0.78);
}

.page-faq .qa summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  padding: 15px 18px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
}

.page-faq .qa summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--accent);
}

.page-faq .qa[open] summary::after {
  content: "–";
}

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-faq .qa__body {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 240, 232, 0.8);
}

/* ---------- glossary ---------- */
.page-faq .glossary-top {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-faq .glossary-top .section-head {
  margin-bottom: 0;
  max-width: 68ch;
}

.page-faq .glossary__texture {
  margin: 0;
  max-width: 340px;
}

.page-faq .glossary__texture img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.page-faq .filter-btn {
  appearance: none;
  min-height: 38px;
  padding: 8px 15px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: rgba(242, 240, 232, 0.76);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .filter-btn:hover {
  border-color: var(--accent);
  color: var(--paper);
}

.page-faq .filter-btn[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--ink);
  font-weight: 500;
}

.page-faq .filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
  font-variant-numeric: tabular-nums;
}

.page-faq .term-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .term {
  padding: 16px 18px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--ink-3);
  border-radius: var(--r);
  transition: border-left-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .term:hover {
  border-left-color: var(--acid);
  background: rgba(242, 240, 232, 0.11);
}

.page-faq .term__name {
  margin: 0 0 8px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .term__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(242, 240, 232, 0.78);
}

/* ---------- more help ---------- */
.page-faq .more-box {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(26px, 4vw, 52px);
  background: linear-gradient(150deg, rgba(24, 58, 82, 0.94), rgba(10, 27, 42, 0.96));
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
}

.page-faq .more-box::before {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 60, 0.3), transparent 70%);
  pointer-events: none;
}

.page-faq .more-box .kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-faq .more-box h2 {
  margin: 0 0 14px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-faq .more-box p {
  margin: 0 0 12px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 240, 232, 0.8);
}

.page-faq .more-box__tip {
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  font-size: 14px;
  color: rgba(242, 240, 232, 0.68);
}

.page-faq .more-box__act {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: end;
}

/* ---------- breakpoints ---------- */
@media (min-width: 720px) {
  .page-faq .read-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .demo__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .term-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-hero__index {
    padding-left: clamp(16px, 2.4vw, 32px);
    border-left: 1px solid var(--line);
  }

  .page-faq .step-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(22px, 3vw, 40px);
  }

  .page-faq .step-track::before {
    content: "";
    position: absolute;
    left: 3%;
    right: 3%;
    top: 78px;
    height: 1px;
    background: linear-gradient(90deg, var(--accent), rgba(38, 224, 214, 0.12));
    transform: rotate(-1.5deg);
    transform-origin: left center;
    opacity: 0.6;
    pointer-events: none;
  }

  .page-faq .demo {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr);
    align-items: start;
  }

  .page-faq .narrow {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-faq .glossary-top {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
  }

  .page-faq .glossary__texture {
    max-width: 300px;
    justify-self: end;
  }

  .page-faq .more-box {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    align-items: end;
  }

  .page-faq .more-box__act {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1100px) {
  .page-faq .read-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .ui-map {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc a,
  .page-faq .filter-btn,
  .page-faq .qa,
  .page-faq .term {
    transition: none;
  }

  .page-faq .faq-hero::before,
  .page-faq .step-track::before {
    transform: none;
  }
}