/* ─── Variables ─────────────────────────────────────────── */
:root {
  --navy:      #00205C;
  --navy-mid:  #003080;
  --gold:      #C9920A;
  --gold-lt:   #F4A81D;
  --blue:     #009ADE;
  --gold-pale: rgba(201,146,10,0.10);
  --white:     #F5F6F8;
  --off-white: #ECEEF2;
  --border:    #D0D6E4;
  --muted:     #52596A;
  --nav-h:     70px;
  --nav-h-sm:  56px;
  --ease:      cubic-bezier(0.16, 1, 0.3, 1);
  --max-w:     1100px;
}

/* ─── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; scroll-padding-top: var(--nav-h); }
body {
  font-family: 'Source Sans 3', sans-serif;
  font-weight: 400;
  color: #1a1f2e;
  background: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a      { color: inherit; text-decoration: none; }
p a    { color: #0066cc; text-decoration: underline; }
p a:hover { color: #004499; }
ul  { list-style: none; }

/* ─── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: height 0.35s var(--ease), border-color 0.35s ease, box-shadow 0.35s ease;
}
.nav.scrolled {
  height: var(--nav-h-sm);
  border-color: var(--border);
  box-shadow: 0 1px 28px rgba(0,32,92,0.08);
}
.nav__logo {
  position: relative;
  height: 150px;
  width: 250px;
  flex-shrink: 0;
  cursor: pointer;
}
.nav__logo img {
  height: 100%;
  width: auto;
  object-fit: contain;
  object-position: left center;
  transition: opacity 0.3s ease;
}
.nav__logo:hover img { opacity: 0.82; }
.nav__links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}
.nav__links a {
  position: relative;
  padding: 0.45rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: 0.01em;
  transition: color 0.25s ease;
}
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 1rem; right: 1rem;
  height: 2px;
  background: var(--gold-lt);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}
.nav__links a:hover            { color: var(--blue); }
.nav__links a:hover::after,
.nav__links a.active::after    { transform: scaleX(1); }
.nav__links a.active           { color: var(--navy); }
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}.nav__links .gh-link a {
  margin-left: 0.5rem;
  padding: 0.38rem 1.1rem;
  background: var(--navy);
  color: var(--white);
  border-radius: 5px;
  font-size: 0.88rem;
  transition: background 0.25s ease;
}
.nav__links .gh-link a:hover { background: var(--blue); color: var(--white); }
.nav__links .gh-link a::after { display: none; }
.nav__burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Hero ───────────────────────────────────────────────── */
.grepi {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--white);
}
#grepi-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.grepi__body {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 8rem 1.5rem 5rem;
  max-width: 780px;
}
.grepi__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: 2.5rem;
  font-weight: 700;
}
.grepi__brand img {
  height: 1em;
  width: auto;
}
.grepi__eyebrow {
  display: inline-block;
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 1.1rem;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) 0.1s forwards;
}
.grepi__title {
  font-family: 'Source Sans 3', sans-serif;
  font-size: clamp(2.6rem, 6vw, 4rem);
  font-weight: 400;
  color: var(--navy);
  line-height: 1.1;
  letter-spacing: -0.01em;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease) 0.25s forwards;
}
.grepi__title em {
  font-style: italic;
  color: var(--gold-lt);
}

.grepi__rule {
  width: 48px; height: 3px;
  background: var(--gold-lt);
  border-radius: 2px;
  margin: 1.6rem auto 1.6rem;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease) 0.4s forwards;
}
.grepi__tagline {
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  font-weight: 300;
  color: var(--navy);
  line-height: 1.8;
  max-width: 560px;
  margin: 0 auto 2.5rem;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease) 0.5s forwards;
}
.grepi__cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease) 0.65s forwards;
}
.grepi__badges {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2.5rem;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease) 0.8s forwards;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.85rem;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1.5px solid var(--border);
  color: var(--muted);
  background: var(--white);
}
.grepi__scroll {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy);
  opacity: 0.3;
  animation: scrollBounce 2.4s ease-in-out infinite;
  z-index: 1;
}
.grepi__scroll svg { width: 16px; height: 16px; stroke: currentColor; fill: none; }

/* ─── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.7rem 1.9rem;
  border-radius: 5px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.25s var(--ease);
}
.btn-primary  { background: var(--navy); color: var(--white); border-color: var(--navy); }
.btn-primary:hover { background: var(--blue); border-color: var(--blue); }
.btn-outline  { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn-outline:hover { background: var(--navy); color: var(--white); transform: translateY(-2px); }
.btn-gold     { background: var(--gold-lt); color: var(--white); border-color: var(--gold-lt); }
.btn-gold:hover { background: var(--gold-lt); border-color: var(--gold-lt); color: var(--white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(201,146,10,0.28); }
.btn-arrow { font-size: 1.1rem; }

/* ─── Sections ────────────────────────────────────────────── */
.section { padding: 1rem clamp(1rem, 4vw, 3rem) 1rem; }
.section__inner { max-width: var(--max-w); margin: 0 auto; }
.section__hd { margin-bottom: 3.5rem; }
.eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.7rem;
}
.section__title {
  font-family: 'Source Sans 3', sans-serif;
  font-size: clamp(1.6rem, 3.2vw, 2.1rem);
  font-weight: 400;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: 0.8rem;
}
.section__title_navy {
  font-family: 'Source Sans 3', sans-serif;
  font-size: clamp(2.6rem, 3.2vw, 2.1rem);
  color: var(--navy);
}
.section__title_yellow {
  font-family: 'Source Sans 3', sans-serif;
  font-size: clamp(1.6rem, 3.2vw, 2.1rem);
  font-weight: 600;
  color: #009ADE;
  line-height: 1.2;
  margin-bottom: 0.8rem;
}
.rule {
  width: 44px; height: 3px;
  background: var(--gold-lt);
  border-radius: 2px;
  margin: 1rem 0 1.4rem;
}
.section__lead {
  font-size: 1.05rem;
  font-weight: 300;
  color: var(--muted);
  line-height: 1.75;
  max-width: 640px;
}

/* ─── Section backgrounds ─────────────────────────────────── */
.s-grepi     { background: var(--white); }
.s-about    { background: var(--white); }
.s-features { background: var(--off-white); }
.s-manual   { background: var(--white); }
.s-api      { background: var(--off-white); }
.s-roadmap  { background: var(--white); }
.s-releases { background: var(--white); padding-bottom: 3rem; }

/* ─── About layout ────────────────────────────────────────── */
.about-grid {
  height: 100%;
  display: grid;
  grid-template-columns: 55fr 45fr;
  gap: 1.5rem;
  align-items: stretch;
  margin-top: 1.5rem;
}
.about-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s ease, box-shadow 0.3s ease;
}
.about-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--navy), var(--navy));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.about-card:hover { box-shadow: 0 8px 32px rgba(0,32,92,0.09); transform: translateY(-4px); }
.about-card:hover::before { transform: scaleX(1); }
.about-card__hd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.about-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
}
.about-card__btn {
  white-space: nowrap;
  font-size: 0.8rem;
  padding: 0.35rem 0.9rem;
}
.about-card .img-placeholder {
  flex: 1;
  aspect-ratio: unset;
  padding: 1rem;
}
.about-card__img {
  flex: 1;
  width: 100%;
  height: 0;
  min-height: 0;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border);
}
.about-text p {
  font-size: 1rem;
  line-height: 1.78;
  color: #2d3244;
  margin-bottom: 1.2rem;
}
.about-img-wrap {
  position: relative;
}

/* ─── Image placeholder ───────────────────────────────────── */
.img-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 60%, #0050a0 100%);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: rgba(255,255,255,0.25);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  overflow: hidden;
  position: relative;
}
.img-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 30px,
      rgba(255,255,255,0.025) 30px,
      rgba(255,255,255,0.025) 31px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 30px,
      rgba(255,255,255,0.025) 30px,
      rgba(255,255,255,0.025) 31px
    );
}
.img-placeholder__icon {
  width: 48px; height: 48px;
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  position: relative; z-index: 1;
}
.img-placeholder__icon svg {
  width: 24px; height: 24px;
  stroke: rgba(255,255,255,0.3);
  fill: none;
}
.img-placeholder__label {
  position: relative; z-index: 1;
  color: rgba(255,255,255,0.2);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
}
.img-placeholder--sm  { aspect-ratio: 4 / 3; }
.img-placeholder--xs  { aspect-ratio: 3 / 2; min-height: 180px; }
.img-placeholder--wide { aspect-ratio: 21 / 9; }
.img-placeholder--gold {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-lt) 100%);
}
.img-placeholder--light {
  background: linear-gradient(135deg, #e8ecf5 0%, #d0d9ee 100%);
  color: rgba(0,32,92,0.2);
}
.img-placeholder--light .img-placeholder__icon { border-color: rgba(0,32,92,0.15); }
.img-placeholder--light .img-placeholder__icon svg { stroke: rgba(0,32,92,0.2); }
.img-placeholder--light::before {
  background:
    repeating-linear-gradient(0deg, transparent, transparent 30px, rgba(0,32,92,0.04) 30px, rgba(0,32,92,0.04) 31px),
    repeating-linear-gradient(90deg, transparent, transparent 30px, rgba(0,32,92,0.04) 30px, rgba(0,32,92,0.04) 31px);
}

/* ─── Feature cards ───────────────────────────────────────── */
.features-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.55rem;
  line-height: 1.25;
  margin-top: 1.5rem;
}
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 1rem;
}
.feat-card {
  background: #ffffff;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 1.85rem 1.6rem;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s var(--ease), border-color 0.3s ease, box-shadow 0.3s ease;
}
.feat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--navy), var(--navy));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.feat-card:hover { box-shadow: 0 8px 32px rgba(0,32,92,0.09); transform: translateY(-4px); }
.feat-card:hover::before { transform: scaleX(1); }
.feat-card__icon {
  width: 44px; height: 44px;
  border-radius: 9px;
  background: var(--navy);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.2rem;
  font-size: 1.35rem;
}
.feat-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.55rem;
  line-height: 1.25;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.feat-card__title-icon {
  font-size: 1.1rem;
  color: var(--navy);
}
.feat-card__text {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.72;
}
.features a { text-decoration: none; }
.features a.btn:hover { background: var(--blue); color: var(--white); }
.feat-card__text a:not(.btn):hover { color: var(--blue); }

/* ─── User Manual ─────────────────────────────────────────── */
.manual-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: start;
}
.manual-toc {
  position: sticky;
  top: calc(var(--nav-h-sm) + 1.5rem);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--white);
}
.manual-toc__hd {
  padding: 1rem 1.4rem;
  background: var(--navy);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.manual-toc__list a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  font-size: 0.875rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  transition: background 0.2s ease, color 0.2s ease;
}
.manual-toc__list a:last-child { border-bottom: none; }
.manual-toc__list a::before { content: '›'; color: var(--gold-lt); font-size: 1rem; }
.manual-toc__list a:hover { background: var(--off-white); color: var(--navy); }
.manual-toc__list a.active { color: var(--navy); font-weight: 700; background: var(--gold-pale); }
.manual-content { display: flex; flex-direction: column; gap: 2.5rem; }
.manual-block { display: flex; flex-direction: column; gap: 1rem; }
.manual-block__title {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 1.25rem;
  color: var(--navy);
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--border);
}
.manual-block p {
  font-size: 0.975rem;
  line-height: 1.78;
  color: #2d3244;
}

/* ─── Code block ──────────────────────────────────────────── */
.code-block {
  background: #0d1117;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.06);
}
.code-block__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.code-block__lang {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold-lt);
}
.code-block__copy {
  font-size: 0.68rem;
  font-weight: 600;
  color: rgba(255,255,255,0.3);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.2s ease;
  letter-spacing: 0.05em;
}
.code-block__copy:hover { color: rgba(255,255,255,0.7); }
.code-block pre {
  padding: 1.25rem 1.25rem;
  font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', monospace;
  font-size: 0.845rem;
  line-height: 1.75;
  color: #e6edf3;
  overflow-x: auto;
  margin: 0;
}
.code-block pre .kw  { color: #ff7b72; }
.code-block pre .fn  { color: #d2a8ff; }
.code-block pre .str { color: #a5d6ff; }
.code-block pre .cm  { color: #8b949e; font-style: italic; }
.code-block pre .nm  { color: #ffa657; }

/* ─── API Documentation ───────────────────────────────────── */
.api-intro {
  display: flex;
  gap: 2rem;
  align-items: center;
}
.api-intro__text { flex: 1; }
.api-intro__card {
  flex: 0 0 340px;
}
.card__pdf-preview {
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  height: 100%;
  min-height: 220px;
  padding: 1.5rem 1rem;
  border-radius: 10px;
  background: #f7f9fc;
  text-decoration: none;
  color: var(--navy);
  transition: background 0.2s ease;
  box-sizing: border-box;
}
.card__pdf-preview:hover { background: #eef3fa; }
.card__pdf-icon { color: #e53e3e; }
.card__pdf-icon svg { width: 48px; height: 48px; }
.card__pdf-label { font-size: 0.8rem; font-weight: 600; text-align: center; color: var(--navy);  }
.card__pdf-open  { font-size: 0.75rem; color: var(--blue); }
@media (max-width: 640px) {
  .api-intro { flex-direction: column; }
  .api-intro__card { flex: unset; width: 100%; }
}

.api-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 1rem;
}
.api-card {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  transition: transform 0.3s var(--ease), border-color 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}
.api-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(to bottom, var(--navy), var(--navy));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.35s var(--ease);
}
.api-card:hover { border-color: rgba(0,32,92,0.18); box-shadow: 0 8px 32px rgba(0,32,92,0.09); transform: translateY(-4px); }
.api-card:hover::before { transform: scaleY(1); }
.api-card__fn {
  font-family: 'SFMono-Regular', 'Consolas', monospace;
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 0.5rem;
}
.api-card__fn span { color: var(--blue); }
.api-card__desc {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.68;
  margin-bottom: 1rem;
}
.api-card .code-block { border-radius: 0; border: none; border-top: 1px solid var(--border); margin-top: 0.75rem; background: var(--off-white); }
.api-card .code-block__bar { background: #e8edf2; border-bottom: 1px solid var(--border); }
.api-card .code-block__lang { color: var(--navy); }
.api-card .code-block__copy { color: var(--muted); }
.api-card .code-block__copy:hover { color: var(--navy); }
.api-card .code-block pre { color: #1a1a2e; font-size: 0.72rem; padding: 0.9rem 1rem; line-height: 1.6; }
.api-card.d5 .code-block pre { font-size: 0.61rem; }
.api-card .code-block pre .kw  { color: #d6336c; }
.api-card .code-block pre .fn  { color: #6741d9; }
.api-card .code-block pre .str { color: #1971c2; }
.api-card .code-block pre .nm  { color: #e67700; }
.api-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.api-tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.18rem 0.55rem;
  border-radius: 20px;
  background: rgba(0,32,92,0.07);
  color: var(--navy);
}

/* ─── Features section ────────────────────────────────────── */
.ftr-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  border-radius: 12px;
  padding: 2rem 2.5rem;
  margin-top: 2.5rem;
  color: var(--white);
}
.ftr-banner__body {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
}
.ftr-banner__icon {
  font-size: 2.5rem;
  color: var(--gold-lt);
  flex-shrink: 0;
  margin-top: 0.1rem;
}
.ftr-banner__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.ftr-banner__text {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.8);
  max-width: 55ch;
}
.ftr-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}
.ftr-item {
  display: flex;
  gap: 1rem;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s ease, box-shadow 0.3s ease;
}
.ftr-item::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--navy), var(--navy));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.ftr-item:hover { box-shadow: 0 8px 32px rgba(0,32,92,0.09); transform: translateY(-4px); }
.ftr-item:hover::before { transform: scaleX(1); }
.ftr-item__icon {
  font-size: 1.75rem;
  color: var(--navy);
  flex-shrink: 0;
  margin-top: 0.1rem;
}
.ftr-item__title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.4rem;
}
.ftr-item__text {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ─── Roadmap / Timeline ──────────────────────────────────── */
.roadmap-timeline {
  position: relative;
  padding-left: 2.5rem;
  margin-top: 1rem;
}
.roadmap-timeline::before {
  content: '';
  position: absolute;
  top: 0; left: 11px;
  width: 2px; height: 100%;
  background: var(--border);
}
.road-item {
  position: relative;
  padding: 0 0 2.5rem 1.5rem;
}
.road-item:last-child { padding-bottom: 0; }
.road-item::before {
  content: '';
  position: absolute;
  left: -0.85rem;
  top: 0.35rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--white);
  border: 2.5px solid var(--border);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.road-item.done::before      { background: var(--navy); border-color: var(--navy); }
.road-item.active::before    { background: var(--gold-lt); border-color: var(--gold-lt); box-shadow: 0 0 0 4px rgba(244,168,29,0.2); }
.road-item.planned::before   { background: var(--white); border-color: var(--border); }
.road-item__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}
.road-item__ver {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.15rem 0.6rem;
  border-radius: 20px;
}
.road-item.done   .road-item__ver { background: rgba(0,32,92,0.09); color: var(--navy); }
.road-item.active .road-item__ver { background: rgba(244,168,29,0.2); color: #7a5600; }
.road-item.planned .road-item__ver { background: var(--off-white); color: var(--muted); border: 1px solid var(--border); }
.road-item__date {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 400;
}
.road-item__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.4rem;
}
.road-item__desc {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
}
.road-item__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.75rem; }
.road-tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.18rem 0.55rem;
  border-radius: 3px;
}
.rt-perf  { background: rgba(0,154,222,0.1);  color: #005a82; }
.rt-api   { background: rgba(201,146,10,0.12); color: #7a5600; }
.rt-model { background: rgba(0,32,92,0.08);    color: var(--navy); }
.rt-viz   { background: rgba(100,180,50,0.1);  color: #2d6a14; }
.rt-docs  { background: rgba(120,80,180,0.1);  color: #5a2ea6; }

/* ─── Release Notes ───────────────────────────────────────── */
.releases { display: flex; flex-direction: column; gap: 2rem; }
.release-card {
  border: 1.5px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}
.release-card:hover { box-shadow: 0 6px 24px rgba(0,32,92,0.08); }
.release-card__hd {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 1.75rem;
  background: white;
  border-bottom: 1px solid var(--border);
}
.release-card__ver {
  font-family: 'SFMono-Regular', 'Consolas', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
}
.release-card__date {
  font-size: 0.8rem;
  color: var(--muted);
}
.release-card__badge {
  margin-left: auto;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
}
.rb-latest { background: rgba(0,32,92,0.09); color: var(--navy); }
.rb-stable { background: rgba(201,146,10,0.15); color: #7a5600; }
.rb-legacy { background: var(--off-white); color: var(--muted); border: 1px solid var(--border); }
.release-card__body { padding: 1.5rem 1.75rem; background: white; }
.release-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.release-list li {
  display: flex;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: #2d3244;
  line-height: 1.62;
}
.release-list li::before { content: '→'; color: var(--gold-lt); flex-shrink: 0; font-weight: 700; }

/* ─── Footer ──────────────────────────────────────────────── */
.footer {
  background: var(--navy);
  color: var(--white);
  padding: 0.5rem clamp(1rem, 4vw, 3rem);
  height: 100px;
}
.footer__inner { max-width: 1100px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 2rem; }
.footer__logo  { height: 34px; filter: brightness(0) invert(1) opacity(0.8); transition: filter 0.25s ease; }
.footer__logo:hover { filter: brightness(0) invert(1); }
.footer__nav   { display: flex; gap: 1.75rem; flex-wrap: wrap; }
.footer__nav a { font-size: 0.875rem; font-weight: 600; color: rgba(255,255,255,0.6); transition: color 0.2s ease; }
.footer__nav a:hover { color: var(--white); }
.footer__copy  { font-size: 0.8rem; color: rgba(255,255,255,0.35); }

.grepi-footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 12px 24px;
  color: white;
  font-size: 12px;
}
.grepi-footer-column       { display: flex; flex-direction: column; gap: 4px; }
.grepi-footer-column-wide  { min-width: 150px; }
.grepi-footer-collab       { display: flex; flex-direction: column; margin-top: -16px; }
.grepi-footer-collab-logo  { height: 56px; }
.grepi-footer-collab-text  { margin-left: 36px; margin-top: -4px; font-size: 11px; white-space: nowrap; }
.grepi-footer-title        { font-weight: bold; font-size: 11px; }
.grepi-footer-link         { font-size: 11px; white-space: nowrap; }
.grepi-footer-link a       { color: white; text-decoration: none; }
.grepi-footer-link a:hover { text-decoration: underline; }
.grepi-footer-who          { display: flex; flex-direction: column; align-items: center; }
.grepi-footer-who-text     { font-size: 11px; white-space: nowrap; text-align: center; }
.grepi-footer-who-text a       { color: white; text-decoration: none; }
.grepi-footer-who-text a:hover { text-decoration: underline; }
.grepi-footer-who-logo     { height: 40px; margin-top: 4px; }

/* ─── Scroll reveal ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}
.reveal.in-view { opacity: 1; transform: none; }
.d1 { transition-delay: 0.06s; }
.d2 { transition-delay: 0.12s; }
.d3 { transition-delay: 0.18s; }
.d4 { transition-delay: 0.24s; }
.d5 { transition-delay: 0.30s; }

/* ─── Parallax wrapper ────────────────────────────────────── */
.parallax-section {
  will-change: transform;
}

/* ─── Back to top ─────────────────────────────────────────── */
#back-to-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  z-index: 800;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--navy);
  color: var(--white);
  border: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.25s ease;
}
#back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
#back-to-top:hover   { background: linear-gradient(to bottom, var(--navy) 50%, var(--gold-lt) 50%); }
#back-to-top svg     { width: 18px; height: 18px; fill: none; stroke: currentColor; }

/* ─── Lightbox ────────────────────────────────────────────── */
.about-card__img { cursor: zoom-in; }
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.9);
  align-items: center;
  justify-content: center;
}
.lightbox.open { display: flex; }
.lightbox__img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
}
.lightbox__close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: #fff;
  font-size: 2.5rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0.7;
}
.lightbox__close:hover { opacity: 1; }

/* ─── Keyframes ───────────────────────────────────────────── */
@keyframes fadeUp {
  to { opacity: 1; transform: none; }
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .features               { grid-template-columns: 1fr 1fr; }
  .ftr-list               { grid-template-columns: 1fr 1fr; }
  .ftr-banner             { flex-direction: column; align-items: flex-start; }
  .about-grid             { grid-template-columns: 1fr; gap: 2rem; }
  .manual-layout          { grid-template-columns: 1fr; }
  .manual-toc             { position: static; }
  .api-grid               { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav__burger  { display: flex; }
  .nav__links {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--white);
    padding: 1rem 1.5rem 1.5rem;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 6px 24px rgba(0,0,0,0.08);
    gap: 0;
  }
  .nav.scrolled .nav__links { top: var(--nav-h-sm); }
  .nav__links.open { display: flex; }
  .nav__links a { padding: 0.8rem 0; border-bottom: 1px solid var(--border); font-size: 1rem; }
  .nav__links a::after { display: none; }
  .features { grid-template-columns: 1fr; }
  .ftr-list { grid-template-columns: 1fr; }
  .section  { padding: 3.5rem clamp(1rem, 4vw, 2rem); }
  .footer__inner { flex-direction: column; text-align: center; }
  .footer__nav   { justify-content: center; }
}
@media (max-width: 480px) {
  .grepi__cta { flex-direction: column; align-items: center; }
  .btn       { width: 220px; text-align: center; }
}