/* ==========================================================================
   ByteCore Stack — About Page CSS  (bca- scoped)
   ========================================================================== */

/* ── Wrapper ─────────────────────────────────────────────────────────────── */
.bpt-main:has(.bca-wrap) { padding-block: 0; }
.bca-wrap {
  margin-top:    calc(-1 * var(--bpt-header-h));
  margin-bottom: 0;
}

/* ── Badge ───────────────────────────────────────────────────────────────── */
.bca-badge {
  display:        inline-flex;
  align-items:    center;
  gap:            .4rem;
  padding:        .3rem .8rem;
  font-size:      .75rem;
  font-weight:    600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color:          var(--bpt-accent-h);
  background:     var(--bpt-accent-dim);
  border:         1px solid rgba(99,102,241,.3);
  border-radius:  999px;
  width:          fit-content;
}

/* ── Gradient text ───────────────────────────────────────────────────────── */
.bca-gradient-text {
  background:              linear-gradient(135deg, #818cf8 0%, #a78bfa 50%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip:         text;
}

/* ── Section heading ─────────────────────────────────────────────────────── */
.bca-section-head {
  text-align:     center;
  display:        flex;
  flex-direction: column;
  align-items:    center;
  gap:            .75rem;
  margin-bottom:  clamp(2.5rem, 5vw, 4rem);
}
.bca-section-head--left {
  text-align:  left;
  align-items: flex-start;
}
.bca-section-head h2 {
  font-size:   clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin:      0;
}
.bca-section-head p {
  font-size:   .95rem;
  color:       var(--bpt-text-2);
  line-height: 1.7;
  margin:      0;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.bca-btn {
  display:         inline-flex;
  align-items:     center;
  justify-content: center;
  gap:             .5rem;
  padding:         .65rem 1.4rem;
  font-size:       .9rem;
  font-weight:     600;
  line-height:     1;
  border-radius:   var(--bpt-radius);
  border:          1px solid transparent;
  cursor:          pointer;
  text-decoration: none;
  white-space:     nowrap;
  transition:      background var(--bpt-t), border-color var(--bpt-t),
                   box-shadow var(--bpt-t), transform var(--bpt-t);
}
.bca-btn:focus-visible { outline: 2px solid var(--bpt-accent-h); outline-offset: 3px; }

.bca-btn--primary {
  background:   var(--bpt-accent);
  border-color: var(--bpt-accent);
  color:        #fff;
}
.bca-btn--primary:hover {
  background:   var(--bpt-accent-h);
  border-color: var(--bpt-accent-h);
  box-shadow:   0 4px 20px rgba(99,102,241,.4);
  transform:    translateY(-1px);
  color:        #fff;
}
.bca-btn--ghost {
  background:   transparent;
  border-color: var(--bpt-border-light);
  color:        var(--bpt-text-2);
}
.bca-btn--ghost:hover {
  border-color: var(--bpt-accent-h);
  color:        var(--bpt-text);
  background:   rgba(99,102,241,.06);
  transform:    translateY(-1px);
}
.bca-btn--lg { padding: .8rem 1.75rem; font-size: .95rem; }

/* ════════════════════════════════════════════════════════════════════════════
   HERO
   ════════════════════════════════════════════════════════════════════════════ */
.bca-hero {
  position:   relative;
  overflow:   hidden;
  background: var(--bpt-bg);
  text-align: center;
  padding:    clamp(6rem, 12vw, 10rem) 0 clamp(3.5rem, 6vw, 5rem);
}

.bca-hero__bg {
  position:       absolute;
  inset:          0;
  pointer-events: none;
}

.bca-hero__glow {
  position:     absolute;
  top:          -20%;
  left:         50%;
  transform:    translateX(-50%);
  width:        min(900px, 100vw);
  height:       min(700px, 100vw);
  background:   radial-gradient(ellipse at center,
                  rgba(99,102,241,.2) 0%,
                  rgba(99,102,241,.05) 40%,
                  transparent 68%);
  border-radius:50%;
}

.bca-hero__grid {
  position:           absolute;
  inset:              0;
  background-image:   linear-gradient(rgba(99,102,241,.06) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(99,102,241,.06) 1px, transparent 1px);
  background-size:    52px 52px;
  mask-image:         radial-gradient(ellipse 90% 80% at 50% 50%, black 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 10%, transparent 75%);
}

.bca-hero__inner {
  position:       relative;
  z-index:        1;
  display:        flex;
  flex-direction: column;
  align-items:    center;
  gap:            1.5rem;
}

.bca-hero__title {
  font-size:      clamp(2.2rem, 5.5vw, 4rem);
  font-weight:    800;
  line-height:    1.1;
  letter-spacing: -.03em;
  margin:         0;
  max-width:      720px;
}

.bca-hero__desc {
  font-size:   1.05rem;
  color:       var(--bpt-text-2);
  line-height: 1.75;
  max-width:   560px;
  margin:      0;
}

/* Stats row */
.bca-hero__stats {
  display:         flex;
  align-items:     center;
  flex-wrap:       wrap;
  justify-content: center;
  gap:             0;
  background:      var(--bpt-surface);
  border:          1px solid var(--bpt-border);
  border-radius:   var(--bpt-radius-lg);
  padding:         .1rem 0;
  margin-top:      .5rem;
}

.bca-hero__stat {
  display:        flex;
  flex-direction: column;
  align-items:    center;
  gap:            .2rem;
  padding:        1rem 2rem;
}
.bca-hero__stat strong {
  font-size:   1.4rem;
  font-weight: 800;
  color:       var(--bpt-text);
  line-height: 1;
}
.bca-hero__stat span {
  font-size: .78rem;
  color:     var(--bpt-text-3);
}

.bca-hero__stat-div {
  width:      1px;
  height:     2.5rem;
  background: var(--bpt-border);
  flex-shrink:0;
}

/* ════════════════════════════════════════════════════════════════════════════
   MISSION
   ════════════════════════════════════════════════════════════════════════════ */
.bca-mission {
  background:    var(--bpt-bg);
  padding:       clamp(4rem, 8vw, 7rem) 0;
  position:      relative;
  overflow:      hidden;
}
.bca-mission::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(99,102,241,.12) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

.bca-mission__inner {
  position:              relative;
  z-index:               1;
  display:               grid;
  grid-template-columns: 1fr 1fr;
  gap:                   clamp(3rem, 6vw, 6rem);
  align-items:           center;
}

.bca-mission__copy {
  display:        flex;
  flex-direction: column;
  gap:            1.1rem;
}

.bca-mission__copy h2 {
  font-size:   clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin:      0;
}

.bca-mission__copy p {
  font-size:   .95rem;
  color:       var(--bpt-text-2);
  line-height: 1.75;
  margin:      0;
}

.bca-check-list {
  list-style:     none;
  padding:        0;
  margin:         .25rem 0 0;
  display:        flex;
  flex-direction: column;
  gap:            .65rem;
}
.bca-check-list li {
  display:     flex;
  align-items: center;
  gap:         .6rem;
  font-size:   .9rem;
  color:       var(--bpt-text-2);
}
.bca-check-list li svg { flex-shrink: 0; color: var(--bpt-success); }

/* Code block */
.bca-code-block {
  background:    var(--bpt-surface);
  border:        1px solid var(--bpt-border-light);
  border-radius: var(--bpt-radius-lg);
  overflow:      hidden;
  box-shadow:    0 24px 60px rgba(0,0,0,.5), 0 0 0 1px rgba(99,102,241,.08);
}
.bca-code-block__chrome {
  display:       flex;
  align-items:   center;
  gap:           .4rem;
  padding:       .6rem .9rem;
  background:    var(--bpt-surface-2);
  border-bottom: 1px solid var(--bpt-border);
}
.bca-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.bca-dot--red    { background: #f43f5e; }
.bca-dot--yellow { background: #f59e0b; }
.bca-dot--green  { background: #10b981; }
.bca-code-block__lang {
  margin-left: .5rem;
  font-size:   .72rem;
  color:       var(--bpt-text-3);
}
.bca-code-block__body {
  margin:      0;
  padding:     1.5rem 1.75rem;
  font-family: var(--bpt-mono);
  font-size:   .82rem;
  line-height: 1.85;
  color:       var(--bpt-text-2);
  white-space: pre;
  overflow-x:  auto;
}
.bca-c-comment { color: var(--bpt-text-3); }
.bca-c-key     { color: var(--bpt-accent-h); }
.bca-c-val     { color: var(--bpt-sky); }
.bca-c-ok      { color: var(--bpt-success); }

/* ════════════════════════════════════════════════════════════════════════════
   VALUES
   ════════════════════════════════════════════════════════════════════════════ */
.bca-values {
  background:    var(--bpt-surface);
  border-top:    1px solid var(--bpt-border);
  border-bottom: 1px solid var(--bpt-border);
  padding:       clamp(4rem, 8vw, 7rem) 0;
  position:      relative;
  overflow:      hidden;
}
.bca-values::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99,102,241,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,.05) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}
.bca-values > .bpt-container { position: relative; z-index: 1; }

.bca-values__grid {
  display:               grid;
  grid-template-columns: repeat(4, 1fr);
  gap:                   1.25rem;
}

.bca-value-card {
  display:        flex;
  flex-direction: column;
  gap:            .85rem;
  padding:        1.75rem 1.5rem;
  background:     var(--bpt-surface-2);
  border:         1px solid var(--bpt-border);
  border-radius:  var(--bpt-radius-lg);
  transition:     border-color var(--bpt-t), box-shadow var(--bpt-t);
}
.bca-value-card:hover {
  border-color: rgba(99,102,241,.35);
  box-shadow:   0 8px 32px rgba(0,0,0,.3);
}

.bca-value-card__icon {
  width:           48px;
  height:          48px;
  border-radius:   var(--bpt-radius);
  background:      var(--bpt-accent-dim);
  border:          1px solid rgba(99,102,241,.2);
  display:         flex;
  align-items:     center;
  justify-content: center;
  color:           var(--bpt-accent-h);
  flex-shrink:     0;
}

.bca-value-card h3 {
  font-size:   1rem;
  font-weight: 700;
  color:       var(--bpt-text);
  margin:      0;
  line-height: 1.3;
}

.bca-value-card p {
  font-size:   .875rem;
  color:       var(--bpt-text-2);
  line-height: 1.7;
  margin:      0;
}

/* ════════════════════════════════════════════════════════════════════════════
   STORY
   ════════════════════════════════════════════════════════════════════════════ */
.bca-story {
  background: var(--bpt-bg);
  padding:    clamp(4rem, 8vw, 7rem) 0;
  position:   relative;
  overflow:   hidden;
}
.bca-story::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 18px,
    rgba(99,102,241,.04) 18px,
    rgba(99,102,241,.04) 19px
  );
  pointer-events: none;
  z-index: 0;
}

.bca-story__inner {
  position: relative;
  z-index:  1;
  max-width: 820px;
}

.bca-story__body {
  display:        flex;
  flex-direction: column;
  gap:            1.25rem;
}

.bca-story__body p {
  font-size:   1rem;
  color:       var(--bpt-text-2);
  line-height: 1.85;
  margin:      0;
}

/* ════════════════════════════════════════════════════════════════════════════
   OPEN SOURCE
   ════════════════════════════════════════════════════════════════════════════ */
.bca-oss {
  background:    var(--bpt-surface);
  border-top:    1px solid var(--bpt-border);
  border-bottom: 1px solid var(--bpt-border);
  padding:       clamp(4rem, 8vw, 7rem) 0;
  position:      relative;
  overflow:      hidden;
}
.bca-oss::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(99,102,241,.1) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

.bca-oss__inner {
  position:              relative;
  z-index:               1;
  display:               grid;
  grid-template-columns: 1fr 380px;
  gap:                   clamp(2.5rem, 5vw, 5rem);
  align-items:           center;
}

.bca-oss__copy {
  display:        flex;
  flex-direction: column;
  gap:            1rem;
}
.bca-oss__copy h2 {
  font-size:   clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin:      0;
}
.bca-oss__copy p {
  font-size:   .95rem;
  color:       var(--bpt-text-2);
  line-height: 1.75;
  max-width:   480px;
  margin:      0;
}
.bca-oss__actions { display: flex; flex-wrap: wrap; gap: .75rem; }

.bca-oss__cards {
  display:               grid;
  grid-template-columns: 1fr 1fr;
  gap:                   .85rem;
}

.bca-oss__card {
  display:        flex;
  flex-direction: column;
  align-items:    center;
  gap:            .4rem;
  padding:        1.5rem 1rem;
  background:     var(--bpt-surface-2);
  border:         1px solid var(--bpt-border);
  border-radius:  var(--bpt-radius);
  text-align:     center;
  color:          var(--bpt-accent-h);
  transition:     border-color var(--bpt-t), box-shadow var(--bpt-t);
}
.bca-oss__card:hover {
  border-color: rgba(99,102,241,.4);
  box-shadow:   0 4px 20px rgba(99,102,241,.1);
}
.bca-oss__card strong { font-size: 1.05rem; font-weight: 700; color: var(--bpt-text); }
.bca-oss__card span   { font-size: .75rem; color: var(--bpt-text-3); }

/* ════════════════════════════════════════════════════════════════════════════
   CTA
   ════════════════════════════════════════════════════════════════════════════ */
.bca-cta {
  position:   relative;
  overflow:   hidden;
  text-align: center;
  background: var(--bpt-bg);
  border-top: 1px solid var(--bpt-border);
  padding:    clamp(4rem, 8vw, 7rem) 0;
}
.bca-cta__bg {
  position:       absolute;
  inset:          0;
  pointer-events: none;
  z-index:        0;
}
.bca-cta__glow {
  position:     absolute;
  top:          -30%;
  left:         50%;
  transform:    translateX(-50%);
  width:        min(900px, 100vw);
  height:       min(900px, 100vw);
  background:   radial-gradient(ellipse at center,
                  rgba(99,102,241,.25) 0%,
                  rgba(167,139,250,.08) 35%,
                  transparent 65%);
  border-radius:50%;
}
.bca-cta__grid {
  position:           absolute;
  inset:              0;
  background-image:   linear-gradient(rgba(99,102,241,.06) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(99,102,241,.06) 1px, transparent 1px);
  background-size:    60px 60px;
  mask-image:         radial-gradient(ellipse 90% 80% at 50% 50%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 20%, transparent 80%);
}
.bca-cta__inner {
  position:       relative;
  z-index:        1;
  display:        flex;
  flex-direction: column;
  align-items:    center;
  gap:            1.5rem;
}
.bca-cta__title {
  font-size:      clamp(2rem, 5vw, 3.25rem);
  font-weight:    800;
  line-height:    1.1;
  letter-spacing: -.03em;
  color:          var(--bpt-text);
  margin:         0;
  max-width:      680px;
}
.bca-cta__desc {
  font-size:   1rem;
  color:       var(--bpt-text-2);
  line-height: 1.7;
  margin:      0;
}
.bca-cta__actions {
  display:         flex;
  flex-wrap:       wrap;
  gap:             .9rem;
  justify-content: center;
  margin-top:      .5rem;
}

/* ════════════════════════════════════════════════════════════════════════════
   RESPONSIVE
   ════════════════════════════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
  .bca-values__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 1024px) {
  .bca-mission__inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .bca-mission__visual { order: -1; max-width: 100%; margin: 0; }

  .bca-oss__inner  { grid-template-columns: 1fr; }
  .bca-oss__cards  { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 768px) {
  .bca-values__grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .bca-oss__cards   { grid-template-columns: 1fr 1fr; }

  .bca-hero__stats  { width: 100%; justify-content: space-around; }
  .bca-hero__stat-div { display: none; }
  .bca-hero__stat   { padding: .85rem 1rem; }
}

@media (max-width: 640px) {
  .bca-hero { padding-top: clamp(7rem, 18vw, 10rem); }
  .bca-hero__title { font-size: clamp(1.9rem, 7vw, 2.6rem); }

  .bca-values__grid { grid-template-columns: 1fr; }

  .bca-cta__actions { flex-direction: column; align-items: stretch; }
  .bca-cta__actions .bca-btn { justify-content: center; }

  .bca-hero__stats { border-radius: var(--bpt-radius); }
}