/* =================================================================
   QUANLITH — AI Compute Infrastructure
   Black & white editorial system
   ================================================================= */

:root {
  --black: #0a0a0b;
  --white: #ffffff;
  --paper: #f7f6f3;        /* warm off-white */
  --ink-60: #5a5a5e;
  --ink-40: #8a8a8e;
  --line: #e4e2dc;         /* hairline on paper */
  --line-strong: #161618;
  --line-inv: #2a2a2e;     /* hairline on black */
  --ink-inv-60: #a6a6aa;
  --ink-inv-40: #6e6e72;

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Instrument Serif", Georgia, serif;

  --gutter: clamp(20px, 5vw, 88px);
  --maxw: 1440px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--black);
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: var(--black); color: var(--paper); }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- Subtle paper grain ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* =================================================================
   TYPOGRAPHY HELPERS
   ================================================================= */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-60);
  margin-bottom: 28px;
}
.eyebrow--inv { color: var(--ink-inv-60); }

.section__title {
  font-size: clamp(2rem, 4.6vw, 4rem);
  line-height: 1.02;
  font-weight: 600;
  letter-spacing: -0.035em;
  max-width: 18ch;
}
.section__title em {
  font-weight: 300;
  font-style: normal;
}

.lede {
  font-size: clamp(1.05rem, 1.5vw, 1.35rem);
  line-height: 1.5;
  color: var(--ink-60);
  max-width: 46ch;
  margin-top: 28px;
  font-weight: 400;
}
.lede--center { margin-left: auto; margin-right: auto; text-align: center; }

/* =================================================================
   BUTTONS / LINKS
   ================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  padding: 14px 26px;
  background: var(--black);
  color: var(--paper);
  border: 1px solid var(--black);
  border-radius: 100px;
  cursor: pointer;
  transition: transform 0.4s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); background: #25252a; }
.btn--ghost { background: transparent; color: var(--black); }
.btn--ghost:hover { background: var(--black); color: var(--paper); }
.btn--sm { padding: 10px 20px; font-size: 0.85rem; }
.btn--lg { padding: 18px 38px; font-size: 1.05rem; }

.link-arrow {
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border-bottom: 1px solid var(--black);
  padding-bottom: 2px;
  transition: gap 0.3s var(--ease);
}
.link-arrow span { transition: transform 0.3s var(--ease); }
.link-arrow:hover span { transform: translateX(4px); }

/* =================================================================
   NAV
   ================================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), backdrop-filter 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(247, 246, 243, 0.78);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom-color: var(--line);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__brand { display: flex; align-items: center; gap: 10px; }
.nav__mark { width: 26px; height: 26px; }
.nav__word {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}
.nav__links {
  display: flex;
  gap: 30px;
  margin-left: auto;
}
.nav__links a {
  font-size: 0.9rem;
  font-weight: 450;
  color: var(--ink-60);
  position: relative;
  transition: color 0.25s var(--ease);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -5px;
  width: 100%; height: 1px;
  background: var(--black);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.nav__links a:hover { color: var(--black); }
.nav__links a:hover::after { transform: scaleX(1); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav__toggle span {
  width: 22px; height: 1.5px;
  background: var(--black);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav.is-open .nav__toggle span:first-child { transform: translateY(6.5px) rotate(45deg); }
.nav.is-open .nav__toggle span:last-child { transform: translateY(-6.5px) rotate(-45deg); }

/* =================================================================
   HERO
   ================================================================= */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(120px, 16vh, 200px) var(--gutter) 0;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 6vw, 96px);
  align-items: center;
}
.hero__title {
  font-size: clamp(3rem, 8.5vw, 7.5rem);
  line-height: 0.92;
  font-weight: 600;
  letter-spacing: -0.045em;
  margin-bottom: 34px;
}
.hero__title em {
  font-weight: 300;
  font-style: normal;
}
.hero__sub {
  font-size: clamp(1.1rem, 1.7vw, 1.4rem);
  line-height: 1.45;
  color: var(--ink-60);
  max-width: 40ch;
  margin-bottom: 40px;
}
.hero__cta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.hero__foot {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  margin-top: clamp(60px, 9vh, 120px);
  padding: 32px 0;
  border-top: 1px solid var(--line);
}
.hero__foot p {
  max-width: 62ch;
  color: var(--ink-60);
  font-size: 1rem;
  line-height: 1.55;
}
.hero__scroll {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-40);
  white-space: nowrap;
  position: relative;
  padding-left: 26px;
}
.hero__scroll::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 18px; height: 1px;
  background: var(--ink-40);
  animation: scrollLine 2.2s var(--ease) infinite;
}
@keyframes scrollLine {
  0%, 100% { transform: scaleX(1); opacity: 1; }
  50% { transform: scaleX(0.4); opacity: 0.4; }
}

/* =================================================================
   MEDIA PLACEHOLDERS
   ================================================================= */
.media__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--white);
  border: 1px solid var(--line-strong);
  overflow: hidden;
}
.media__frame[data-ratio="4/5"] { aspect-ratio: 4/5; }
.media__frame[data-ratio="3/4"] { aspect-ratio: 3/4; }
.media__frame[data-ratio="4/3"] { aspect-ratio: 4/3; }
.media__frame[data-ratio="1/1"] { aspect-ratio: 1/1; }
.media__frame[data-ratio="21/9"] { aspect-ratio: 21/9; }

/* real media (img or video) sits above the placeholder; img removed via onerror if missing */
.media__img,
.media__vid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  z-index: 1;
}
/* when real media is present, drop the hatch fill & registration marks */
.media__frame:has(.media__img) .media__placeholder,
.media__frame:has(.media__vid) .media__placeholder,
.media-band__frame:has(.media__img) .media__placeholder,
.media-band__frame:has(.media__vid) .media__placeholder { display: none; }
.media__frame:has(.media__img)::before,
.media__frame:has(.media__img)::after,
.media__frame:has(.media__vid)::before,
.media__frame:has(.media__vid)::after,
.media-band__frame:has(.media__img)::before,
.media-band__frame:has(.media__img)::after,
.media-band__frame:has(.media__vid)::before,
.media-band__frame:has(.media__vid)::after { display: none; }

/* registration corner marks */
.media__frame::before,
.media__frame::after {
  content: "";
  position: absolute;
  width: 14px; height: 14px;
  border: 1px solid var(--black);
  z-index: 2;
}
.media__frame::before { top: 12px; left: 12px; border-right: none; border-bottom: none; }
.media__frame::after { bottom: 12px; right: 12px; border-left: none; border-top: none; }

/* faint diagonal field */
.media__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background-image: repeating-linear-gradient(
    -45deg,
    transparent, transparent 11px,
    rgba(10,10,11,0.035) 11px, rgba(10,10,11,0.035) 12px
  );
  transition: background 0.5s var(--ease);
}
.media:hover .media__placeholder { background-color: var(--paper); }
.media__icon {
  width: 64px; height: 64px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 20px;
  color: var(--black);
  background: var(--paper);
  transition: transform 0.4s var(--ease), background 0.3s, color 0.3s;
  padding-left: 4px;
}
.media__icon--img { padding-left: 0; font-size: 26px; }
.media:hover .media__icon { transform: scale(1.08); background: var(--black); color: var(--paper); }
.media__label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-60);
}
.media__cap {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-40);
  margin-top: 14px;
  text-transform: uppercase;
}

/* inverted (on dark) media */
.media--inv .media__frame { background: #161618; border-color: var(--line-inv); }
.media--inv .media__frame::before,
.media--inv .media__frame::after { border-color: var(--white); }
.media--inv .media__placeholder {
  background-image: repeating-linear-gradient(
    -45deg, transparent, transparent 11px,
    rgba(255,255,255,0.045) 11px, rgba(255,255,255,0.045) 12px
  );
}
.media--inv:hover .media__placeholder { background-color: #0f0f11; }
.media--inv .media__icon { border-color: var(--line-inv); color: var(--white); background: #161618; }
.media--inv:hover .media__icon { background: var(--white); color: var(--black); }
.media--inv .media__label { color: var(--ink-inv-60); }
.media--inv .media__cap { color: var(--ink-inv-40); }

.media--wide { margin-top: clamp(48px, 7vw, 88px); }

/* =================================================================
   MARQUEE
   ================================================================= */
.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  padding: 22px 0;
  margin-top: clamp(40px, 6vw, 80px);
}
.marquee__track {
  display: flex;
  align-items: center;
  gap: 28px;
  white-space: nowrap;
  width: max-content;
  animation: marquee 34s linear infinite;
}
.marquee__track span {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(1rem, 1.7vw, 1.45rem);
  letter-spacing: -0.01em;
  color: var(--black);
}
.marquee__track .dot { color: var(--ink-40); font-size: 0.9rem; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* =================================================================
   SECTIONS
   ================================================================= */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(80px, 12vw, 160px) var(--gutter);
}
.section--rule { border-top: 1px solid var(--line); }
.section__head { margin-bottom: clamp(48px, 6vw, 80px); }
.section__head .section__title { margin-bottom: 0; }
.section--dark {
  max-width: none;
  background: var(--black);
  color: var(--paper);
}
.section--dark .section__title { color: var(--paper); }
.section--dark > * {
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
}

/* ---------- CARDS ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.card {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(28px, 3vw, 44px);
  min-height: 230px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  position: relative;
  transition: background 0.4s var(--ease);
}
.card:hover { background: var(--white); }
.card h3 {
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin: 0 0 14px;
}
.card p { color: var(--ink-60); font-size: 0.98rem; line-height: 1.55; }

/* ---------- SPLIT ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: center;
}
.split--reverse .media--inv { order: -1; }
.split .section__title { color: inherit; }
.section--dark .lede { color: var(--ink-inv-60); }

/* ---------- TAGLIST ---------- */
.taglist {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: 32px;
  margin-top: clamp(56px, 7vw, 96px);
  border-top: 1px solid var(--line-inv);
}
.taglist li {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-inv-60);
  padding: 16px 0;
  border-bottom: 1px solid var(--line-inv);
  transition: color 0.3s var(--ease);
}
.taglist li:hover { color: var(--white); }

/* ---------- TRIAD ---------- */
.triad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  margin-top: clamp(48px, 6vw, 72px);
}
.triad__col {
  padding: clamp(32px, 3vw, 48px) clamp(24px, 3vw, 44px);
  border-right: 1px solid var(--line);
}
.triad__col:last-child { border-right: none; }
.triad__h {
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 28px;
}

/* ---------- TICKS ---------- */
.ticks li {
  padding: 11px 0 11px 26px;
  position: relative;
  color: var(--ink-60);
  font-size: 1rem;
  border-bottom: 1px solid var(--line);
}
.ticks li:last-child { border-bottom: none; }
.ticks li::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 9px; height: 9px;
  background: var(--black);
  transform: translateY(-50%) rotate(45deg);
}
.ticks--inv li { color: var(--ink-inv-60); border-bottom-color: var(--line-inv); }
.ticks--inv li::before { background: var(--white); }
.ticks--inv { margin-top: 28px; }

/* ---------- ROWS (deployment) ---------- */
.rows { border-top: 1px solid var(--line-strong); }
.row {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 24px;
  align-items: baseline;
  padding: clamp(26px, 3vw, 40px) 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.4s var(--ease);
}
.row:hover { padding-left: 16px; }
.row__h {
  font-size: clamp(1.3rem, 2vw, 1.85rem);
  font-weight: 600;
  letter-spacing: -0.03em;
}
.row__p { color: var(--ink-60); font-size: 1rem; line-height: 1.55; max-width: 50ch; }

/* ---------- SPEC (infrastructure dl) ---------- */
.spec {
  margin-top: clamp(56px, 7vw, 88px);
  border-top: 1px solid var(--line-inv);
}
.spec__row {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-inv);
}
.spec__row dt {
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.spec__row dd { color: var(--ink-inv-60); font-size: 1rem; line-height: 1.5; }

/* ---------- CHIPS ---------- */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(40px, 5vw, 64px);
}
.chips li {
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  padding: 11px 22px;
  font-size: 0.95rem;
  font-weight: 450;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}
.chips li:hover { background: var(--black); color: var(--paper); }

/* =================================================================
   CINEMATIC MEDIA BAND (full-bleed)
   ================================================================= */
.media-band {
  padding: 0 var(--gutter);
  max-width: var(--maxw);
  margin: clamp(24px, 4vw, 56px) auto clamp(80px, 11vw, 150px);
}
.media-band__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--white);
  border: 1px solid var(--line-strong);
  overflow: hidden;
}
.media-band__frame::before,
.media-band__frame::after {
  content: "";
  position: absolute;
  width: 16px; height: 16px;
  border: 1px solid var(--black);
  z-index: 2;
}
.media-band__frame::before { top: 16px; left: 16px; border-right: none; border-bottom: none; }
.media-band__frame::after { bottom: 16px; right: 16px; border-left: none; border-top: none; }
.media__cap--center { text-align: center; }

/* =================================================================
   CONTACT
   ================================================================= */
.section--contact {
  border-top: 1px solid var(--line);
  text-align: center;
}
.contact { display: flex; flex-direction: column; align-items: center; }
.contact .eyebrow { margin-bottom: 24px; }
.contact__title {
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 1;
  font-weight: 600;
  letter-spacing: -0.04em;
}
.contact__title em {
  font-weight: 300;
  font-style: normal;
}
.contact__btn { margin-top: clamp(36px, 5vw, 56px); }

/* =================================================================
   FOOTER
   ================================================================= */
.footer {
  background: var(--black);
  color: var(--paper);
  padding: clamp(64px, 9vw, 120px) var(--gutter) 40px;
}
.footer__top {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.3fr 2fr;
  gap: clamp(40px, 6vw, 96px);
  padding-bottom: clamp(48px, 6vw, 80px);
  border-bottom: 1px solid var(--line-inv);
}
.footer__brand { display: flex; flex-direction: column; gap: 14px; }
.footer__mark { width: 36px; height: 36px; }
.footer__word { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.03em; }
.footer__tag { color: var(--ink-inv-60); max-width: 30ch; line-height: 1.5; }
.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.footer__col { display: flex; flex-direction: column; gap: 14px; }
.footer__col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-inv-40);
  font-weight: 500;
  margin-bottom: 4px;
}
.footer__col a {
  color: var(--ink-inv-60);
  font-size: 0.98rem;
  width: fit-content;
  transition: color 0.25s var(--ease);
}
.footer__col a:hover { color: var(--white); }
.footer__bottom {
  max-width: var(--maxw);
  margin: 32px auto 0;
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-inv-40);
}

/* =================================================================
   REVEAL ANIMATION
   ================================================================= */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* =================================================================
   RESPONSIVE
   ================================================================= */
@media (max-width: 1024px) {
  .cards, .cards--why { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__links.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 24px var(--gutter);
    gap: 20px;
  }
  .nav__toggle { display: flex; margin-left: auto; }
  .nav .btn--sm { display: none; }

  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .media--hero { max-width: 440px; }
  .hero__foot { flex-direction: column; align-items: flex-start; gap: 20px; }

  .split { grid-template-columns: 1fr; }
  .split--reverse .media--inv { order: 0; }

  .triad { grid-template-columns: 1fr; }
  .triad__col { border-right: none; border-bottom: 1px solid var(--line); }
  .triad__col:last-child { border-bottom: none; }

  .row { grid-template-columns: 1fr; gap: 10px; }
  .taglist { grid-template-columns: repeat(3, 1fr); column-gap: 24px; }

  .spec__row { grid-template-columns: 1fr; gap: 8px; }
  .footer__top { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .cards, .cards--why { grid-template-columns: 1fr; }
  .taglist { grid-template-columns: repeat(2, 1fr); column-gap: 20px; }
  .footer__cols { grid-template-columns: 1fr 1fr; }
  .hero__title { font-size: clamp(2.6rem, 14vw, 4rem); }
}