/* ============================================================
   HOÀNG CAO MINH — PORTFOLIO
   Obys-inspired: ink canvas, editorial type, one blue accent
   ============================================================ */

:root {
  --ink: #0e0e10;
  --ink-soft: #17171a;
  --paper: #e8e6df;
  --paper-dim: #9b9992;
  --accent: #2b4bff;
  --accent-soft: #4a66ff;
  --font-display: "Syne", sans-serif;
  --font-body: "Instrument Sans", sans-serif;
  --font-mono: "Space Mono", monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --pad: clamp(1.25rem, 4vw, 4rem);
}

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

html { scrollbar-width: thin; scrollbar-color: #333 var(--ink); }

body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }
em { font-style: italic; }
.mono {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ============ PRELOADER ============ */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
}
.preloader__inner {
  width: min(90vw, 900px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.preloader__row {
  display: flex;
  justify-content: space-between;
  color: var(--paper-dim);
  overflow: hidden;
}
.preloader__label {
  display: inline-block;
  transform: translateY(120%);
  animation: label-up 0.8s var(--ease-out) 0.2s forwards;
}
@keyframes label-up { to { transform: translateY(0); } }
.preloader__counter {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(5rem, 22vw, 16rem);
  line-height: 0.9;
  text-align: center;
  color: var(--paper);
}
.preloader__counter::after { content: "%"; font-size: 0.35em; color: var(--accent); }
.preloader__curtain {
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: top;
  z-index: -1;
}
.preloader.is-done .preloader__inner { animation: fade-out 0.4s ease forwards; }
.preloader.is-done .preloader__curtain {
  z-index: 1;
  animation: curtain 1s var(--ease-out) 0.3s forwards;
}
.preloader.is-done { animation: lift 0.9s var(--ease-out) 0.75s forwards; }
@keyframes fade-out { to { opacity: 0; } }
@keyframes curtain {
  0% { transform: scaleY(0); transform-origin: bottom; }
  100% { transform: scaleY(1); transform-origin: bottom; }
}
@keyframes lift { to { transform: translateY(-101%); visibility: hidden; } }

/* ============ CURSOR ============ */
.cursor { position: fixed; inset: 0; z-index: 90; pointer-events: none; }
.cursor__dot,
.cursor__circle {
  position: absolute;
  top: 0; left: 0;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  will-change: transform;
}
.cursor__dot {
  width: 6px; height: 6px;
  background: var(--accent);
}
.cursor__circle {
  width: 44px; height: 44px;
  border: 1px solid rgba(232, 230, 223, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: width 0.35s var(--ease-out), height 0.35s var(--ease-out),
              background-color 0.35s, border-color 0.35s;
}
.cursor__text { font-size: 0.55rem; color: var(--ink); opacity: 0; transition: opacity 0.2s; letter-spacing: 0.08em; }
.cursor--hover .cursor__circle {
  width: 64px; height: 64px;
  border-color: var(--accent);
  background: rgba(43, 75, 255, 0.12);
}
.cursor--label .cursor__circle {
  width: 84px; height: 84px;
  background: var(--paper);
  border-color: var(--paper);
}
.cursor--label .cursor__text { opacity: 1; }
.cursor--label .cursor__dot { opacity: 0; }
@media (hover: none), (pointer: coarse) { .cursor { display: none; } }

/* ============ GRAIN ============ */
.grain {
  position: fixed;
  inset: -50%;
  z-index: 80;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 0.7s steps(4) infinite;
}
@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 3%); }
  50% { transform: translate(3%, -2%); }
  75% { transform: translate(-3%, -3%); }
  100% { transform: translate(2%, 2%); }
}

/* ============ NAV ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem var(--pad);
  mix-blend-mode: difference;
  color: #e8e6df;
}
.nav__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}
.nav__logo sup { font-size: 0.55em; color: var(--accent-soft); }
.nav__links { display: flex; gap: clamp(1rem, 3vw, 2.5rem); }
.nav__link { position: relative; padding: 0.2rem 0; }
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.45s var(--ease-out);
}
.nav__link:hover::after { transform: scaleX(1); transform-origin: left; }
.nav__meta { color: inherit; opacity: 0.7; }
@media (max-width: 640px) { .nav__meta { display: none; } }

/* ============ HERO ============ */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem var(--pad) 3rem;
  position: relative;
}
.hero__eyebrow { margin-bottom: 2rem; color: var(--paper-dim); }
.hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.2rem, 14.5vw, 12.5rem);
  line-height: 0.92;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.hero__title em {
  font-weight: 500;
  color: transparent;
  -webkit-text-stroke: 2px var(--paper);
}
.line--indent { display: block; padding-left: clamp(2rem, 12vw, 12rem); }
.hero__bottom {
  margin-top: clamp(2rem, 6vh, 4.5rem);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.hero__desc {
  max-width: 30rem;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  color: var(--paper-dim);
}
.hero__desc em { color: var(--paper); font-style: normal; border-bottom: 1px solid var(--accent); }
.hero__scroll { color: var(--paper-dim); display: flex; align-items: center; gap: 0.6rem; }
.hero__scroll-arrow { display: inline-block; animation: bounce 1.6s ease-in-out infinite; color: var(--accent-soft); font-size: 1rem; }
@keyframes bounce { 50% { transform: translateY(6px); } }
.hero__index {
  position: absolute;
  top: 22%; right: var(--pad);
  color: var(--ink-soft);
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 700;
  z-index: -1;
  -webkit-text-stroke: 1px #26262b;
  color: transparent;
  letter-spacing: 0;
}

/* ============ MARQUEE ============ */
.marquee {
  border-top: 1px solid #232328;
  border-bottom: 1px solid #232328;
  padding: 1.1rem 0;
  overflow: hidden;
  white-space: nowrap;
}
.marquee__track { display: inline-flex; align-items: center; gap: 2.5rem; will-change: transform; }
.marquee__item {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2.4rem);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--paper);
}
.marquee__track .marquee__item:nth-child(4n+3) {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--paper-dim);
}
.marquee__dot { color: var(--accent); font-size: 1.2rem; }

/* ============ SECTIONS ============ */
.section { padding: clamp(6rem, 14vh, 10rem) var(--pad) 0; }
.section__head {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  margin-bottom: clamp(2.5rem, 6vh, 4.5rem);
  border-bottom: 1px solid #232328;
  padding-bottom: 1.2rem;
}
.section__num { color: var(--accent-soft); }
.section__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 6.5vw, 5.5rem);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.section__title em {
  font-weight: 500;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--paper);
}

/* line reveal */
.line { display: block; overflow: hidden; }
.line__inner {
  display: inline-block;
  transform: translateY(115%);
  transition: transform 1.1s var(--ease-out);
}
.is-inview .line__inner, .line.is-inview .line__inner { transform: translateY(0); }

.reveal-line { overflow: hidden; }
.reveal-line > * { display: inline-block; transform: translateY(130%); transition: transform 0.9s var(--ease-out); }
.reveal-line.is-inview > * { transform: translateY(0); }

.reveal-block {
  opacity: 0;
  transform: translateY(2.2rem);
  transition: opacity 0.9s ease, transform 0.9s var(--ease-out);
}
.reveal-block.is-inview { opacity: 1; transform: translateY(0); }

/* ============ ABOUT ============ */
.about__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 6vw, 6rem);
}
.about__lead {
  font-size: clamp(1.35rem, 2.6vw, 2.1rem);
  line-height: 1.4;
  font-weight: 500;
  grid-column: 1;
}
.about__lead strong { color: var(--accent-soft); font-weight: 600; }
.about__sub {
  margin-top: 1.5rem;
  color: var(--paper-dim);
  max-width: 34rem;
  grid-column: 1;
}
.about__facts {
  grid-column: 2;
  grid-row: 1 / span 2;
  list-style: none;
  display: flex;
  flex-direction: column;
}
.about__fact {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid #232328;
}
.about__fact:first-child { border-top: 1px solid #232328; }
.about__fact .mono { color: var(--accent-soft); }
.about__fact strong { font-size: 1.1rem; font-weight: 600; }
.about__fact em { font-style: normal; color: var(--paper-dim); font-size: 0.9rem; }
@media (max-width: 800px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__facts { grid-column: 1; grid-row: auto; margin-top: 2rem; }
}

/* ============ SKILLS ============ */
.skills { display: flex; flex-direction: column; }
.skills__row {
  display: grid;
  grid-template-columns: minmax(8rem, 16rem) 1fr;
  gap: 1rem;
  align-items: baseline;
  padding: 1.6rem 0;
  border-bottom: 1px solid #232328;
  transition: padding-left 0.5s var(--ease-out);
  position: relative;
}
.skills__row::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 0.5rem; height: 0.5rem;
  background: var(--accent);
  transform: translateY(-50%) scale(0);
  transition: transform 0.4s var(--ease-out);
}
.skills__row:hover { padding-left: 1.5rem; }
.skills__row:hover::before { transform: translateY(-50%) scale(1); }
.skills__cat { color: var(--paper-dim); }
.skills__row:hover .skills__cat { color: var(--accent-soft); }
.skills__list {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.1rem, 2.6vw, 1.9rem);
  line-height: 1.35;
}
@media (max-width: 640px) { .skills__row { grid-template-columns: 1fr; gap: 0.3rem; } }

/* ============ WORKS ============ */
.works { display: flex; flex-direction: column; }
.work {
  position: relative;
  display: block;
  border-bottom: 1px solid #232328;
  overflow: hidden;
}
.work:first-child { border-top: 1px solid #232328; }
.work__fill {
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.55s var(--ease-out);
}
.work:hover .work__fill { transform: scaleY(1); transform-origin: top; }
.work__inner {
  position: relative;
  display: grid;
  grid-template-columns: 5rem 1fr auto;
  gap: clamp(1rem, 3vw, 3rem);
  align-items: start;
  padding: clamp(1.8rem, 4vh, 3rem) 0.5rem;
  transition: transform 0.55s var(--ease-out);
}
.work:hover .work__inner { transform: translateX(1.2rem); }
.work__num { color: var(--paper-dim); padding-top: 0.6rem; }
.work:hover .work__num { color: rgba(232, 230, 223, 0.7); }
.work__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.8rem, 5vw, 4rem);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.work__desc {
  margin-top: 0.8rem;
  max-width: 36rem;
  color: var(--paper-dim);
  font-size: 0.95rem;
}
.work:hover .work__desc { color: rgba(232, 230, 223, 0.85); }
.work__tags { margin-top: 1rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.work__tags span {
  border: 1px solid #2e2e34;
  border-radius: 2rem;
  padding: 0.25rem 0.7rem;
  color: var(--paper-dim);
  transition: border-color 0.3s, color 0.3s;
}
.work:hover .work__tags span { border-color: rgba(232, 230, 223, 0.5); color: var(--paper); }
.work__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.4rem;
  color: var(--paper-dim);
  padding-top: 0.6rem;
}
.work:hover .work__meta { color: rgba(232, 230, 223, 0.8); }
@media (max-width: 700px) {
  .work__inner { grid-template-columns: 1fr; gap: 0.6rem; }
  .work__meta { flex-direction: row; align-items: center; }
}

/* ============ CONTACT ============ */
.contact { padding: clamp(6rem, 14vh, 10rem) var(--pad) 2rem; }
.contact__email {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 6.2vw, 5.8rem);
  text-transform: lowercase;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: clamp(2rem, 6vh, 4rem) 0;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--paper);
  transition: color 0.5s var(--ease-out), -webkit-text-stroke-color 0.5s;
  word-break: break-word;
}
.contact__email:hover { color: var(--accent); -webkit-text-stroke-color: var(--accent); }
.contact__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  border-top: 1px solid #232328;
  padding-top: 2rem;
}
.contact__col { display: flex; flex-direction: column; gap: 0.5rem; }
.contact__col .mono { color: var(--accent-soft); }
.contact__col a:hover { color: var(--accent-soft); }
@media (max-width: 700px) { .contact__grid { grid-template-columns: 1fr; } }
.contact__bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid #232328;
  color: var(--paper-dim);
}
.contact__bottom a:hover { color: var(--paper); }

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .line__inner, .reveal-line > *, .reveal-block { transform: none !important; opacity: 1 !important; }
  .preloader { display: none; }
  .cursor { display: none; }
}