/* dsgn:ng — portfolio of brian ng
   Style guide: bg #1e1e1e · Montserrat · 16:9 imagery · 5px corner radius */

:root {
  --bg: #1e1e1e;
  --ink: #f4f4f4;
  --muted: #c9c9c9;
  --frame: #101010;
  --tile: #0c0c0c;
  --chip: #e6e7e8;
  --radius: 5px;
  --content: min(76vw, 1240px);
  --gap-section: clamp(3.5rem, 7vw, 6.5rem);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Montserrat", "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  font-weight: 500;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

img, video { display: block; }

a { color: inherit; text-decoration: none; }

::selection { background: #e6e7e8; color: #1e1e1e; }

:focus-visible {
  outline: 2px solid #e6e7e8;
  outline-offset: 4px;
  border-radius: 4px;
}

.container {
  width: var(--content);
  margin-inline: auto;
}

@media (max-width: 720px) {
  :root { --content: min(88vw, 1240px); }
}

/* ---------- header ---------- */

.site-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-top: clamp(1.75rem, 4vw, 3.5rem);
}

.brand img {
  width: clamp(120px, 13.5vw, 196px);
  height: auto;
}

.menu-btn {
  position: relative;
  border: 0;
  background: transparent;
  cursor: pointer;
  width: clamp(70px, 6vw, 88px);
  aspect-ratio: 1157.44 / 474.08;
  display: grid;
  place-items: center;
  padding: 0;
  font: inherit;
  z-index: 60;
}

.menu-btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("../assets/menu_button.svg") no-repeat center / contain;
  transition: transform 0.25s ease;
}

.menu-btn:hover::before { transform: scale(1.06); }

.menu-btn span {
  /* Heading 4: Montserrat Bold */
  position: relative;
  color: #1e1e1e;
  font-weight: 700;
  font-size: clamp(0.72rem, 0.9vw, 0.9rem);
  letter-spacing: 0.01em;
}

/* ---------- menu overlay ---------- */

.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(18, 18, 18, 0.97);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
  z-index: 50;
}

.menu-overlay.is-open { opacity: 1; visibility: visible; }

.menu-overlay nav ul {
  list-style: none;
  display: grid;
  gap: clamp(0.9rem, 2.5vh, 1.6rem);
  text-align: center;
}

.menu-overlay nav a {
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  line-height: 1.1;
  color: var(--ink);
  transition: color 0.2s ease, opacity 0.2s ease;
  opacity: 0;
  transform: translateY(14px);
}

.menu-overlay.is-open nav a {
  opacity: 1;
  transform: none;
  transition: color 0.2s ease, opacity 0.45s ease, transform 0.45s cubic-bezier(0.2, 0.7, 0.2, 1);
  transition-delay: calc(var(--i) * 55ms);
}

.menu-overlay nav a:hover { color: #8d8d8d; }

.menu-overlay nav a[aria-current="page"] { color: #8d8d8d; }

/* ---------- page heading (Heading 2) ---------- */

.tagline {
  text-align: center;
  font-weight: 600;
  font-size: clamp(1.1rem, 0.95rem + 0.95vw, 1.65rem);
  line-height: 1.45;
  white-space: nowrap;
  margin: clamp(2.5rem, 6vw, 4.5rem) auto clamp(2rem, 4.5vw, 3rem);
}

/* ---------- media frames ---------- */

.frame {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--frame);
}

.frame img,
.frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.fit-contain img,
.frame video {
  object-fit: contain;
}

.caption {
  text-align: center;
  color: var(--muted);
  font-size: clamp(0.85rem, 0.78rem + 0.35vw, 1rem);
  line-height: 1.5;
  margin-top: clamp(0.9rem, 1.8vw, 1.4rem);
}

.media-block { margin-bottom: var(--gap-section); }

main { padding-bottom: clamp(4rem, 9vw, 8rem); }

/* ---------- home: hero ---------- */

.hero-link { display: block; }

.hero-link .frame img {
  transform-origin: 50% 0;
  transition: transform 1.1s cubic-bezier(0.3, 0.6, 0.3, 1);
}

.hero-link:hover .frame img,
.hero-link:focus-visible .frame img {
  transform: scale(1.2);
  transition: transform 6s cubic-bezier(0.16, 0.6, 0.3, 1);
}

/* ---------- home: tiles ---------- */

.tile-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: clamp(2rem, 5.5vw, 4.5rem);
  row-gap: clamp(2.5rem, 5.5vw, 4.5rem);
  margin-top: clamp(3rem, 7vw, 5.5rem);
}

.tile { display: block; }

.tile .frame img {
  opacity: 0.5;
  transition: opacity 0.45s ease;
}

.tile:hover .frame img,
.tile:focus-visible .frame img {
  opacity: 0.75;
}

.tile-label {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  font-weight: 700;
  font-size: clamp(1.5rem, 1rem + 2.1vw, 2.9rem);
  line-height: 1.1;
  color: #fff;
  padding: 0 1rem;
  z-index: 2;
}

@media (max-width: 720px) {
  .tile-grid { grid-template-columns: 1fr; }
}

/* ---------- carousel ---------- */

.carousel {
  position: relative;
  touch-action: pan-y;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.car-track {
  display: flex;
  height: 100%;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

.car-slide {
  flex: 0 0 100%;
  min-width: 100%;
  height: 100%;
}

.car-slide img,
.car-slide video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.car-slide.fit-contain img { object-fit: contain; }
.car-slide video { object-fit: contain; }

.car-arrow {
  position: absolute;
  top: 50%;
  translate: 0 -50%;
  width: clamp(2.4rem, 3.4vw, 3rem);
  aspect-ratio: 1;
  border: 0;
  border-radius: 50%;
  background: rgba(15, 15, 15, 0.55);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  z-index: 3;
  opacity: 0.75;
  transition: opacity 0.25s ease, background 0.25s ease;
}

.car-arrow:hover { opacity: 1; background: rgba(10, 10, 10, 0.8); }

.car-arrow.prev { left: clamp(0.6rem, 1.4vw, 1.25rem); }
.car-arrow.next { right: clamp(0.6rem, 1.4vw, 1.25rem); }

.car-arrow svg { width: 42%; height: 42%; }

.car-play {
  position: absolute;
  left: clamp(0.6rem, 1.4vw, 1.25rem);
  bottom: clamp(0.6rem, 1.4vw, 1rem);
  width: clamp(2.1rem, 2.8vw, 2.6rem);
  aspect-ratio: 1;
  border: 0;
  border-radius: 50%;
  background: rgba(15, 15, 15, 0.55);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  z-index: 3;
  opacity: 0.75;
  transition: opacity 0.25s ease, background 0.25s ease;
}

.car-play:hover { opacity: 1; background: rgba(10, 10, 10, 0.8); }

.car-play svg { width: 48%; height: 48%; }

.car-dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: clamp(0.6rem, 1.4vw, 1rem);
  display: flex;
  justify-content: center;
  gap: 0.45rem;
  z-index: 3;
}

.car-dots button {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 0;
  padding: 0;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transition: background 0.25s ease, transform 0.25s ease;
}

.car-dots button[aria-current="true"] {
  background: #fff;
  transform: scale(1.25);
}

/* ---------- logos grid ---------- */

.logo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 2vw, 1.6rem);
  margin-top: clamp(2.5rem, 5vw, 4rem);
}

.logo-tile {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--tile);
}

.logo-tile img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.logo-tile .color {
  opacity: 0;
  transition: opacity 0.35s ease;
}

.logo-tile:hover .color,
.logo-tile:focus-visible .color { opacity: 1; }

@media (max-width: 720px) {
  .logo-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- more page ---------- */

.more-note {
  text-align: center;
  color: var(--muted);
  font-size: clamp(0.9rem, 0.85rem + 0.35vw, 1.05rem);
  margin-top: clamp(2rem, 4vw, 3rem);
}

/* ---------- motion preferences ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-link .frame img,
  .car-track,
  .tile .frame img,
  .logo-tile .color,
  .menu-overlay,
  .menu-overlay.is-open nav a {
    transition: none !important;
  }
  .hero-link:hover .frame img,
  .hero-link:focus-visible .frame img { transform: none; }
}