/* Herbert Do - profile page. Hand-written, no framework. */

:root {
  --paper: #f3efe6;
  --ink: #121212;
  --lime: #c8ff3d;
  --coral: #ff5a36;
  --blue: #5b6cff;
  --line: 2px solid var(--ink);
  --shadow: 6px 6px 0 var(--ink);
  --display: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Instrument Serif", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --pad: clamp(1.1rem, 4vw, 3.5rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  overflow-x: hidden;
  font-family: var(--display);
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink);
  background-color: var(--paper);
  background-image: radial-gradient(rgba(18, 18, 18, 0.13) 1px, transparent 1px);
  background-size: 22px 22px;
}
h1, h2, h3, p, ul, ol { margin: 0; padding: 0; }
ul, ol { list-style: none; }
a { color: inherit; }
img { display: block; max-width: 100%; }
::selection { background: var(--lime); color: var(--ink); }
em { font-family: var(--serif); font-style: italic; font-weight: 400; }

/* Custom cursor (fine pointers only, enabled by JS) */
.cursor {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  border-radius: 50%;
  background: #fff;
  mix-blend-mode: difference;
  pointer-events: none;
  opacity: 0;
  transition: width 0.25s, height 0.25s, margin 0.25s, opacity 0.3s;
}
.cursor.on { opacity: 1; }
.cursor.big { width: 64px; height: 64px; margin: -32px 0 0 -32px; }

/* Top bar */
.topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem var(--pad);
  font-family: var(--mono);
  font-size: 0.78rem;
}
.logo { font-family: var(--display); font-size: 1.5rem; font-weight: 700; text-decoration: none; letter-spacing: -0.04em; }
.logo span { color: var(--coral); }
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.4rem 0.9rem;
  border: var(--line);
  border-radius: 999px;
  background: #fff;
  box-shadow: 3px 3px 0 var(--ink);
}
.dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: #19c15c; animation: ping 2s infinite; }
@keyframes ping {
  0% { box-shadow: 0 0 0 0 rgba(25, 193, 92, 0.6); }
  70%, 100% { box-shadow: 0 0 0 0.55rem rgba(25, 193, 92, 0); }
}
.clock b { font-weight: 700; }

/* Hero */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: min(100svh, 62rem);
  padding: 6.5rem var(--pad) 3rem;
}
.eyebrow { font-family: var(--mono); font-size: 0.85rem; margin-bottom: 0.5rem; }
.giant {
  font-size: clamp(4.2rem, 18.5vw, 19rem);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.035em;
  text-transform: uppercase;
}
.giant .line { display: flex; align-items: center; flex-wrap: wrap; gap: 0 0.12em; overflow: hidden; padding-bottom: 0.06em; }
.giant .line:nth-child(2) .word { -webkit-text-stroke: 2px var(--ink); color: transparent; }
.giant .ch { display: inline-block; transform: translateY(110%); animation: rise 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; animation-delay: calc(var(--i) * 55ms + 100ms); }
@keyframes rise { to { transform: none; } }
.giant .ch:hover { color: var(--coral); -webkit-text-stroke: 0; }
.role {
  display: inline-block;
  padding: 0.35em 0.8em;
  font-family: var(--mono);
  font-size: clamp(0.7rem, 1.3vw, 1.05rem);
  font-style: normal;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
  text-transform: none;
  border: var(--line);
  border-radius: 999px;
  background: var(--lime);
  box-shadow: 3px 3px 0 var(--ink);
  transform: rotate(-4deg);
}
.hero-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem 3rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: var(--line);
}
.hero-lead { max-width: 36rem; font-size: 1.1rem; }
.swap {
  display: inline-block;
  padding: 0 0.35em;
  font-weight: 700;
  color: var(--paper);
  background: var(--ink);
}
.swap::after { content: "_"; animation: blink 0.9s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.9rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  font: 700 0.95rem var(--display);
  color: var(--ink);
  text-decoration: none;
  border: var(--line);
  border-radius: 999px;
  background: #fff;
  box-shadow: 4px 4px 0 var(--ink);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background-color 0.15s;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--ink); }
.btn:active { transform: translate(4px, 4px); box-shadow: 0 0 0 var(--ink); }
.btn-solid { background: var(--coral); }

/* Draggable stickers */
.stickers { position: absolute; inset: 0; pointer-events: none; }
.sticker {
  position: absolute;
  top: var(--t);
  left: var(--l);
  padding: 0.5rem 0.9rem;
  font: 700 0.9rem var(--mono);
  white-space: nowrap;
  border: var(--line);
  border-radius: 0.6rem;
  background: var(--c);
  box-shadow: 4px 4px 0 var(--ink);
  transform: translate(var(--x, 0px), var(--y, 0px)) rotate(var(--r));
  pointer-events: auto;
  cursor: grab;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.sticker.drag { cursor: grabbing; box-shadow: 10px 10px 0 var(--ink); z-index: 3; }
.drag-hint { position: absolute; top: 77%; left: 84%; font: 0.72rem var(--mono); opacity: 0.6; transform: rotate(-6deg); }
.drag-hint::before { content: "\2196  "; }

.badge {
  position: absolute;
  top: 5.5rem;
  right: var(--pad);
  width: clamp(6.5rem, 12vw, 10rem);
  animation: spin 18s linear infinite;
}
.badge circle { fill: var(--blue); stroke: var(--ink); stroke-width: 3; }
.badge text { font: 700 15.5px var(--mono); letter-spacing: 1.5px; fill: #fff; }
.badge-core { animation: spin 18s linear infinite reverse; transform-origin: 100px 100px; }
.badge-core rect { fill: var(--lime); stroke: var(--ink); stroke-width: 3; }
.badge-core path { stroke: var(--ink); stroke-width: 3; stroke-linecap: round; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Marquee */
.marquee {
  overflow: hidden;
  padding: 0.9rem 0;
  color: var(--paper);
  background: var(--ink);
  transform: rotate(-1.2deg) scale(1.02);
}
.marquee-track { display: flex; width: max-content; animation: slide 30s linear infinite; }
.marquee-track span { padding: 0 1.2rem; font-size: clamp(1.3rem, 3vw, 2.2rem); font-weight: 700; text-transform: uppercase; white-space: nowrap; }
.marquee-track span::after { content: "\2726"; margin-left: 2.4rem; color: var(--lime); }
.marquee-track span:nth-child(3n) { font-family: var(--serif); font-style: italic; font-weight: 400; text-transform: none; }
@keyframes slide { to { transform: translateX(-50%); } }

/* Sections */
.section { padding: clamp(4.5rem, 10vw, 9rem) var(--pad) 0; }
.section-head { margin-bottom: clamp(2rem, 5vw, 4rem); }
.label { font: 0.85rem var(--mono); margin-bottom: 0.75rem; }
.section h2 {
  font-size: clamp(2.6rem, 8vw, 7rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.045em;
}
.section h2 em { letter-spacing: -0.02em; color: var(--coral); }

/* Reveal (class added by JS) */
.rv { opacity: 0; transform: translateY(36px) rotate(var(--rr, 0deg)); transition: opacity 0.7s, transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1); transition-delay: var(--d, 0s); }
.rv.in { opacity: 1; transform: none; }

/* About bento */
.bento { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.1rem; }
.card {
  position: relative;
  padding: 1.5rem;
  border: var(--line);
  border-radius: 1.4rem;
  background: #fff;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translate(-3px, -3px) rotate(-0.6deg); box-shadow: 10px 10px 0 var(--ink); }
.card-tag {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.15rem 0.6rem;
  font: 0.72rem var(--mono);
  color: var(--paper);
  border-radius: 999px;
  background: var(--ink);
}
.card-title { font-size: 1.45rem; font-weight: 700; line-height: 1.15; letter-spacing: -0.02em; }
.card-intro { grid-column: span 2; grid-row: span 2; display: flex; flex-direction: column; background: var(--lime); }
.card-intro .card-tag { align-self: flex-start; }
.card-intro .big { margin-bottom: 1.25rem; font-size: clamp(1.5rem, 2.7vw, 2.4rem); font-weight: 500; line-height: 1.12; letter-spacing: -0.03em; }
.card-intro p:last-child { max-width: 34rem; margin-top: auto; }
.card-loc { background: var(--blue); color: #fff; }
.cities { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 1rem; }
.cities span { padding: 0.15rem 0.6rem; font: 0.72rem var(--mono); border: 1.5px solid #fff; border-radius: 999px; }
.cities span:first-child, .cities span:last-child { color: var(--ink); background: #fff; }
.card-learn { color: var(--paper); background: var(--ink); }
.card-learn .card-tag { color: var(--ink); background: var(--lime); }
.term { margin-bottom: 0.9rem; font: 700 0.92rem var(--mono); color: var(--lime); word-break: break-word; }
.term span { color: var(--coral); }
.term i { display: inline-block; width: 0.55em; height: 1.05em; margin-left: 0.2em; vertical-align: text-bottom; background: var(--lime); animation: blink 0.9s steps(1) infinite; }
.card-learn p:last-child { font-size: 0.92rem; opacity: 0.85; }
.card-lang .alt { font-family: var(--serif); font-style: italic; font-weight: 400; font-size: 1.9rem; color: var(--coral); }
.card-soft { background: #ffd23d; }
.card-soft li { padding: 0.3rem 0; font-weight: 700; border-bottom: 1.5px dashed var(--ink); }
.card-soft li:last-child { border: 0; }
.card-soft li::before { content: "\2192  "; }

/* Skills */
.skill-rows { border-top: var(--line); }
.skill-rows li {
  position: relative;
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr) minmax(0, 1.4fr);
  align-items: center;
  gap: 1rem;
  padding: 1.3rem 0.5rem;
  border-bottom: var(--line);
  overflow: hidden;
  transition: color 0.3s, padding 0.3s;
}
.skill-rows li::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--ink);
  transform: scaleY(0);
  transform-origin: 50% 100%;
  transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.skill-rows li:hover { color: var(--paper); padding-left: 1.5rem; }
.skill-rows li:hover::before { transform: scaleY(1); }
.skill-rows .n { font: 0.85rem var(--mono); }
.skill-rows h3 { font-size: clamp(1.7rem, 4.6vw, 3.6rem); font-weight: 700; line-height: 1; letter-spacing: -0.04em; }
.skill-rows li:hover h3 { font-family: var(--serif); font-style: italic; font-weight: 400; color: var(--lime); }
.skill-rows p { display: flex; flex-wrap: wrap; gap: 0.4rem; justify-content: flex-end; }
.skill-rows p span, .chips span {
  padding: 0.2rem 0.7rem;
  font: 0.78rem var(--mono);
  border: 1.5px solid currentColor;
  border-radius: 999px;
}

/* Projects showcase */
.showcase { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(1.5rem, 5vw, 5rem); align-items: start; }
.stage { position: sticky; top: 4vh; height: min(92vh, 52rem); }
.stage-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  border: var(--line);
  border-radius: 2rem;
  background: var(--stage, #19b3a6);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: background-color 0.6s;
}
.stage-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.16) 1.5px, transparent 1.5px), linear-gradient(90deg, rgba(255, 255, 255, 0.16) 1.5px, transparent 1.5px);
  background-size: 34px 34px;
}
.stage-count { position: absolute; left: 1.2rem; bottom: 1rem; font: 0.85rem var(--mono); color: #fff; }
.stage-count b { font: 700 2.6rem var(--display); letter-spacing: -0.04em; }
.phone {
  position: relative;
  height: min(78%, 620px);
  aspect-ratio: 120 / 264;
  padding: 2.2%;
  border: 3px solid var(--ink);
  border-radius: 13% / 6%;
  background: var(--ink);
  box-shadow: 14px 14px 0 rgba(18, 18, 18, 0.9);
  transform: rotate(var(--tilt, -5deg));
  transition: transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.phone-screen { position: relative; width: 100%; height: 100%; overflow: hidden; border-radius: 11% / 5%; background: #fff; }
.phone-screen img { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; transform: translateY(8%) scale(1.04); transition: opacity 0.5s, transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1); }
.phone-screen img.on { opacity: 1; transform: none; }
.phone-notch { position: absolute; top: 3.2%; left: 50%; width: 30%; height: 3%; border-radius: 999px; background: var(--ink); transform: translateX(-50%); }

.project { display: flex; flex-direction: column; justify-content: center; min-height: min(92vh, 52rem); padding: 2rem 0; opacity: 0.28; transition: opacity 0.4s; }
.project.on { opacity: 1; }
.project-meta { font: 0.82rem var(--mono); margin-bottom: 0.8rem; }
.project h3 { margin-bottom: 1rem; font-size: clamp(2.2rem, 5vw, 4.4rem); font-weight: 700; line-height: 0.98; letter-spacing: -0.045em; }
.project > p { max-width: 36rem; }
.project ul { max-width: 36rem; margin: 1.2rem 0; border-top: var(--line); }
.project li { position: relative; padding: 0.6rem 0 0.6rem 1.6rem; border-bottom: 1.5px dashed rgba(18, 18, 18, 0.45); }
.project li::before { content: "\2726"; position: absolute; left: 0; color: var(--coral); }
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.mini-phone { display: none; }

/* Journey */
.log {
  padding: clamp(1.2rem, 3vw, 2.5rem);
  color: #e9e6dc;
  border: var(--line);
  border-radius: 1.6rem;
  background: var(--ink);
  box-shadow: 8px 8px 0 var(--coral);
}
.log-cmd { margin-bottom: 2rem; font: 700 0.95rem var(--mono); color: var(--lime); }
.log-cmd span { color: var(--coral); }
.log ol { position: relative; margin-left: 0.55rem; padding-left: clamp(1.4rem, 3vw, 2.6rem); border-left: 2px dashed rgba(233, 230, 220, 0.35); }
.log li { position: relative; padding-bottom: 2.4rem; }
.log li:last-child { padding-bottom: 0.5rem; }
.log li::before {
  content: "";
  position: absolute;
  top: 0.15rem;
  left: calc(-1 * clamp(1.4rem, 3vw, 2.6rem) - 0.6rem);
  width: 1.1rem;
  height: 1.1rem;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 2px var(--coral);
  transition: transform 0.25s;
}
.log li.study::before { background: var(--lime); box-shadow: 0 0 0 2px var(--lime); }
.log li:hover::before { transform: scale(1.5); }
.log-line { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.8rem; margin-bottom: 0.45rem; font: 0.8rem var(--mono); }
.hash { color: #ffd23d; }
.ref { padding: 0.05rem 0.55rem; color: var(--ink); border-radius: 999px; background: var(--coral); }
.study .ref { background: var(--lime); }
.log time { opacity: 0.7; }
.log h3 { font-size: clamp(1.4rem, 3vw, 2.2rem); font-weight: 700; line-height: 1.1; letter-spacing: -0.03em; transition: transform 0.25s; }
.log li:hover h3 { transform: translateX(0.5rem); }
.log .where { margin: 0.15rem 0 0.5rem; font-family: var(--serif); font-style: italic; font-size: 1.25rem; color: var(--lime); }
.log li > p:last-child { max-width: 44rem; opacity: 0.8; }

/* Contact */
.contact {
  margin-top: clamp(4.5rem, 10vw, 9rem);
  padding-bottom: 7.5rem;
  color: var(--paper);
  border-radius: 2.5rem 2.5rem 0 0;
  background: var(--ink);
}
.contact h2 { font-size: clamp(3.4rem, 13vw, 12rem); line-height: 0.86; }
.contact h2 em { color: var(--lime); }
.contact-lead { max-width: 30rem; margin: 2rem 0 2.5rem; font-size: 1.15rem; opacity: 0.8; }
.mail {
  display: inline-block;
  max-width: 100%;
  font-size: clamp(1.25rem, 5.4vw, 4.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.04em;
  text-decoration: none;
  overflow-wrap: anywhere;
  background: linear-gradient(var(--lime), var(--lime)) 0 100% / 100% 0.08em no-repeat;
  transition: background-size 0.35s, color 0.35s;
}
.mail:hover { color: var(--ink); background-size: 100% 100%; }
.contact-row { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.2rem; margin-top: 2.5rem; }
.btn-light { background: var(--lime); box-shadow: 4px 4px 0 var(--coral); }
.btn-light:hover { box-shadow: 6px 6px 0 var(--coral); }
.btn-ghost { color: var(--paper); border-color: var(--paper); background: transparent; box-shadow: 4px 4px 0 var(--paper); }
.btn-ghost:hover { box-shadow: 6px 6px 0 var(--paper); }
.contact .where { font: 0.85rem var(--mono); opacity: 0.7; }
.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 2rem; margin-top: 4.5rem; padding-top: 1.2rem; font: 0.78rem var(--mono); border-top: 1px solid rgba(243, 239, 230, 0.25); opacity: 0.7; }

/* Dock */
.dock {
  position: fixed;
  left: 50%;
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 50;
  display: flex;
  gap: 0.25rem;
  padding: 0.4rem;
  border: 2px solid var(--paper);
  border-radius: 999px;
  background: var(--ink);
  box-shadow: 0 0.8rem 2rem rgba(0, 0, 0, 0.35);
  transform: translateX(-50%);
}
.dock a {
  display: flex;
  align-items: center;
  height: 2.6rem;
  padding: 0 0.75rem;
  color: var(--paper);
  text-decoration: none;
  border-radius: 999px;
  transition: background-color 0.25s, color 0.25s, transform 0.2s;
}
.dock svg { width: 1.25rem; height: 1.25rem; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.dock span { max-width: 0; overflow: hidden; font: 700 0.8rem var(--mono); white-space: nowrap; transition: max-width 0.35s, margin 0.35s; }
.dock a:hover { transform: translateY(-4px); }
.dock a.active { color: var(--ink); background: var(--lime); }
.dock a.active span { max-width: 6rem; margin-left: 0.5rem; }

/* Responsive */
@media (max-width: 1000px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
  .stickers { position: static; display: flex; flex-wrap: wrap; gap: 0.7rem 0.6rem; order: 5; margin-top: 2rem; }
  .sticker { position: static; }
  .drag-hint { position: static; align-self: center; }
  .hero { justify-content: center; }
}
@media (max-width: 860px) {
  .showcase { display: block; }
  .stage { display: none; }
  .project { min-height: 0; padding: 0 0 4rem; opacity: 1; }
  .mini-phone {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
    padding: 2rem 0;
    border: var(--line);
    border-radius: 1.5rem;
    background: var(--pc);
    box-shadow: var(--shadow);
  }
  .mini-phone img { width: 46%; max-width: 11rem; border: 5px solid var(--ink); border-radius: 1.3rem; background: #fff; box-shadow: 8px 8px 0 rgba(18, 18, 18, 0.9); transform: rotate(-4deg); }
  .skill-rows li { grid-template-columns: 2.4rem minmax(0, 1fr); }
  .skill-rows p { grid-column: 2; justify-content: flex-start; }
}
@media (max-width: 560px) {
  .hide-s, .clock { display: none; }
  .bento { grid-template-columns: 1fr; }
  .card-intro { grid-column: auto; grid-row: auto; }
  .badge { top: 4.6rem; }
  .giant .line:nth-child(2) .word { -webkit-text-stroke-width: 1.5px; }
  .dock a { padding: 0 0.6rem; }
  .contact { border-radius: 1.6rem 1.6rem 0 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .giant .ch { transform: none; }
  .rv { opacity: 1; transform: none; }
}