/* ═══════════════════════════════════════════════════════════════
   Arble — About page styles (Refined Editorial System)
   Calm, concise, premium aesthetic inspired by Linear, Arc, Anthropic & Apple.
   ═══════════════════════════════════════════════════════════════ */

/* ── Reveal animation ── */
.rv {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.rv--d1 { transition-delay: .08s; }
.rv--d2 { transition-delay: .16s; }

.rv.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .rv {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

.nav__link--active {
  color: var(--ink);
  background: var(--surface-2);
  border-radius: 999px;
}

/* ── Section Vertical Spacing (80-110px) ── */
.sec--ab {
  padding-block: clamp(80px, 9vw, 110px);
}

/* ── Global Typography Hierarchy ── */
.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.head {
  font-family: var(--display-font);
  font-size: clamp(24px, 2.5vw, 32px);
  line-height: 1.25;
  font-weight: 500;
  letter-spacing: -.02em;
  color: var(--ink);
  max-width: 680px;
}

.lede {
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-2);
  font-weight: 420;
  letter-spacing: -.01em;
}

.body {
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-2);
  font-weight: 420;
}

/* ═══════════════ PLACEHOLDERS (320px–420px max) ═══════════════ */
.ab-placeholder {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.ab-placeholder--hero {
  width: 100%;
  height: 100%;
  min-height: 340px;
  max-height: 420px;
}

.ab-placeholder--wide {
  width: 100%;
  height: clamp(300px, 32vw, 380px);
  border-radius: 14px;
  background: var(--surface-2);
}

.ab-placeholder--portrait {
  width: 100%;
  aspect-ratio: 4 / 5;
  max-height: 380px;
  border-radius: 12px;
  background: var(--surface-2);
}

.ab-placeholder--platform {
  width: 100%;
  height: clamp(280px, 28vw, 360px);
  border-radius: 14px;
  background: var(--surface-2);
}

.ab-placeholder__label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 32px;
  text-align: center;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--ink-3);
  line-height: 1.5;
  max-width: 320px;
}

.ab-placeholder__label svg {
  width: 24px;
  height: 24px;
  color: var(--ink-4);
  flex-shrink: 0;
}

/* ═══════════════ HERO ═══════════════ */
.ab-hero {
  padding-block: clamp(120px, 12vw, 150px) clamp(70px, 8vw, 90px);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.ab-hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 5vw, 64px);
  align-items: center;
}

@media (max-width: 860px) {
  .ab-hero__inner {
    grid-template-columns: 1fr;
  }
  .ab-hero__vis {
    order: -1;
  }
}

.ab-hero__eyebrow {
  margin-block-end: 16px;
}

.ab-hero__title {
  font-family: var(--display-font);
  font-feature-settings: "blwf" on, "cv09" on, "cv03" on, "cv04" on, "cv11" on;
  font-weight: 500;
  letter-spacing: -.03em;
  font-size: clamp(30px, 3.5vw, 46px);
  line-height: 1.15;
  margin-block-end: 20px;
}

.ab-hero__lead {
  margin-block-end: 28px;
  max-width: 520px;
}

.ab-hero__cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.ab-hero__vis {
  height: clamp(300px, 32vw, 400px);
  border-radius: 16px;
  overflow: hidden;
}

/* ═══════════════ SPLIT LAYOUT ═══════════════ */
.ab-split {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: clamp(32px, 4vw, 60px);
  align-items: start;
}

@media (max-width: 760px) {
  .ab-split {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.ab-split__label {
  padding-block-start: 4px;
}

/* Editorial typography */
.ab-editorial {
  font-family: var(--display-font);
  font-size: clamp(20px, 2.2vw, 24px);
  line-height: 1.45;
  letter-spacing: -.02em;
  font-weight: 420;
  color: var(--ink);
  max-width: 680px;
}

.ab-editorial--secondary {
  color: var(--ink-2);
  margin-block-start: 20px;
  font-size: clamp(17px, 1.8vw, 20px);
}

/* Subdued Stats Support */
.ab-stats {
  display: flex;
  gap: clamp(32px, 5vw, 60px);
  margin-block-start: 36px;
  padding-block-start: 28px;
  border-block-start: 1px solid var(--line);
  flex-wrap: wrap;
}

.ab-stat__n {
  font-family: var(--display-font);
  font-size: clamp(28px, 3.2vw, 38px);
  font-weight: 500;
  letter-spacing: -.03em;
  line-height: 1;
  color: var(--ink);
}

.ab-stat__d {
  margin-block-start: 6px;
  font-size: 13px;
  color: var(--ink-3);
  font-weight: 420;
}

/* ═══════════════ PROBLEM SECTION ═══════════════ */
.ab-problem-img {
  margin-block: clamp(36px, 4vw, 52px);
}

.ab-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 640px) {
  .ab-cards { grid-template-columns: 1fr; }
}

.ab-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 32px 36px;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.ab-card:hover {
  border-color: var(--line-2);
  box-shadow: var(--sh-card);
}

.ab-card--alt {
  background: var(--ink);
  border-color: transparent;
  color: var(--paper);
}

.ab-card__ic {
  width: 28px;
  height: 28px;
  color: var(--ink-3);
  margin-block-end: 16px;
}

.ab-card--alt .ab-card__ic {
  color: rgba(255,255,255,.5);
}

.ab-card__t {
  font-family: var(--display-font);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -.015em;
  margin-block-end: 16px;
}

.ab-card--alt .ab-card__t {
  color: var(--paper);
}

.ab-card__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ab-card__list li {
  font-size: 15px;
  color: var(--ink-2);
  padding-inline-start: 16px;
  position: relative;
  line-height: 1.5;
}

.ab-card__list li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--ink-4);
}

.ab-card--alt .ab-card__list li {
  color: rgba(255,255,255,.7);
}

.ab-card--alt .ab-card__list li::before {
  color: rgba(255,255,255,.3);
}

.ab-card__list--check li::before {
  content: "✓";
  color: var(--ink-3);
}

.ab-card--alt .ab-card__list--check li::before {
  color: rgba(255,255,255,.5);
}

/* ═══════════════ PHILOSOPHY ═══════════════ */
.ab-philosophy {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: clamp(32px, 4vw, 60px);
  align-items: start;
}

@media (max-width: 760px) {
  .ab-philosophy { grid-template-columns: 1fr; gap: 16px; }
}

.ab-quote {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 32px 36px;
  margin-block-end: 24px;
}

.ab-quote__text {
  font-family: var(--display-font);
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 500;
  letter-spacing: -.02em;
  line-height: 1.4;
  color: var(--ink);
  margin-block-end: 12px;
}

.ab-quote__attr {
  font-size: 13px;
  color: var(--ink-3);
  font-family: var(--mono);
}

.ab-philosophy__copy {
  max-width: 600px;
}

/* ═══════════════ PRINCIPLES ═══════════════ */
.ab-principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-block-start: clamp(36px, 4vw, 48px);
}

@media (max-width: 860px) {
  .ab-principles { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 540px) {
  .ab-principles { grid-template-columns: 1fr; }
}

.ab-principle {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 32px;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.ab-principle:hover {
  border-color: var(--line-2);
  box-shadow: var(--sh-card);
}

.ab-principle__ic {
  width: 26px;
  height: 26px;
  color: var(--ink-3);
  margin-block-end: 14px;
}

.ab-principle__t {
  font-family: var(--display-font);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -.015em;
  margin-block-end: 8px;
  color: var(--ink);
}

.ab-principle__d {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
}

/* ═══════════════ PRODUCT (PLATFORM) ═══════════════ */
.ab-platform-img {
  margin-block: clamp(32px, 4vw, 48px);
}

.ab-platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
}

@media (max-width: 800px) {
  .ab-platform-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .ab-platform-grid { grid-template-columns: 1fr; }
}

.ab-platform-item {
  background: var(--paper);
  padding: 24px 28px;
  transition: background .2s var(--ease);
}

.ab-platform-item:hover {
  background: var(--surface);
}

.ab-platform-item__t {
  font-family: var(--display-font);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.015em;
  color: var(--ink);
  margin-block-end: 6px;
}

.ab-platform-item__d {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-3);
}

/* ═══════════════ TEAM (EXACTLY 2 FOUNDERS) ═══════════════ */
.sechead--center {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
  margin-block-end: clamp(36px, 4vw, 52px);
}

.sechead--center .tagpill {
  margin-inline: auto;
}

.ab-team-duo {
  display: grid;
  grid-template-columns: repeat(2, minmax(260px, 340px));
  justify-content: center;
  gap: clamp(32px, 4vw, 60px);
}

@media (max-width: 640px) {
  .ab-team-duo { grid-template-columns: 1fr; }
}

.ab-founder {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* The cap lives on the portrait, not on the image inside it: .ab-founder__social
   is absolutely positioned against this box, so capping the <img> alone would
   leave the hover overlay spanning the full column while the photo sat narrower
   than it. Both now share one box. */
.ab-founder__portrait {
  position: relative;
  max-width: 250px;
  border-radius: 12px;
  overflow: hidden;
}

/* 1:1 with no height ceiling. The files are square and shown whole against the
   250px cap, so the ratio resolves exactly to 250x250. */
.ab-founder__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center top;
  border-radius: 12px;
  background: var(--surface-2);
}

.ab-founder__social {
  position: absolute;
  inset: 0;
  background: rgba(10,10,11,.82);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  opacity: 0;
  transition: opacity .25s var(--ease);
  border-radius: 12px;
}

.ab-founder:hover .ab-founder__social {
  opacity: 1;
}

.ab-social-ic {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.2);
  display: grid;
  place-items: center;
  color: var(--paper);
  text-decoration: none;
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.ab-social-ic:hover {
  background: rgba(255,255,255,.15);
  border-color: rgba(255,255,255,.4);
}

.ab-social-ic svg {
  width: 15px;
  height: 15px;
}

.ab-founder__name {
  font-family: var(--display-font);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -.015em;
  color: var(--ink);
}

.ab-founder__role {
  font-size: 13px;
  color: var(--ink-3);
  margin-block-start: 2px;
  font-family: var(--mono);
}

.ab-founder__bio {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
  margin-block-start: 6px;
}

/* ═══════════════ FAQ ACCORDION (EXACTLY 5) ═══════════════ */
.ab-faq {
  display: flex;
  flex-direction: column;
  border-block-start: 1px solid var(--line);
  margin-block-start: clamp(36px, 4vw, 48px);
  max-width: 800px;
  margin-inline: auto;
}

.ab-faq__item {
  border-block-end: 1px solid var(--line);
}

.ab-faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 20px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--display-font);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -.015em;
  color: var(--ink);
  transition: color .2s var(--ease);
}

.ab-faq__t {
  flex: 1;
  line-height: 1.35;
}

.ab-faq__m {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  position: relative;
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.ab-faq__m::before,
.ab-faq__m::after {
  content: "";
  position: absolute;
  background: var(--ink-2);
  border-radius: 2px;
}

.ab-faq__m::before {
  width: 8px;
  height: 1.5px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.ab-faq__m::after {
  width: 1.5px;
  height: 8px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: transform .3s var(--ease-soft), opacity .3s var(--ease-soft);
}

.ab-faq__item.is-open .ab-faq__m {
  background: var(--ink);
  border-color: var(--ink);
}

.ab-faq__item.is-open .ab-faq__m::before,
.ab-faq__item.is-open .ab-faq__m::after {
  background: var(--paper);
}

.ab-faq__item.is-open .ab-faq__m::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.ab-faq__wrap {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .35s var(--ease-soft);
  overflow: hidden;
}

.ab-faq__item.is-open .ab-faq__wrap {
  grid-template-rows: 1fr;
}

.ab-faq__a {
  padding-block-end: 20px;
  padding-inline-end: 32px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-2);
  min-height: 0;
  overflow: hidden;
}

.ab-faq__a a {
  color: var(--ink);
  text-underline-offset: 3px;
}

/* ═══════════════ FINAL CTA ═══════════════ */
.ab-final-cta {
  padding-block: clamp(90px, 11vw, 130px);
  background: var(--surface);
  border-block-start: 1px solid var(--line);
  text-align: center;
}

.ab-final-cta__inner {
  max-width: 680px;
  margin-inline: auto;
}

.ab-final-cta__label {
  margin-block-end: 18px;
}

.ab-final-cta__headline {
  font-family: var(--display-font);
  font-feature-settings: "blwf" on, "cv09" on, "cv03" on, "cv04" on, "cv11" on;
  font-size: clamp(30px, 3.5vw, 44px);
  font-weight: 500;
  letter-spacing: -.03em;
  line-height: 1.15;
  color: var(--ink);
  margin-block-end: 20px;
}

.ab-final-cta__sub {
  max-width: 480px;
  margin-inline: auto;
  margin-block-end: 32px;
}

.ab-final-cta__btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}