/* =========================================================
   Christine Hwang — Cybersecurity Portfolio
   Dark "terminal" theme. Ported from a Figma Make design to a
   zero-build static site. Swap --accent to re-skin everything.
   ========================================================= */

:root {
  --bg:        #0a0e14;   /* page background */
  --bg-alt:    #0d1620;   /* resume section */
  --card:      #111722;   /* project cards */
  --border:    #1e2d40;   /* hairlines */
  --ink:       #e2e8f0;   /* primary text */
  --muted:     #94a3b8;   /* body copy */
  --dim:       #64748b;   /* labels / inactive */
  --accent:    #00b4ff;   /* neon-blue signature */
  --blue:      #38bdf8;
  --purple:    #a78bfa;
  --amber:     #f59e0b;

  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --sans: 'Inter', system-ui, sans-serif;

  --maxw: 1100px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
::selection { background: rgba(0, 180, 255, 0.25); color: var(--ink); }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}
.nav.is-scrolled {
  background: rgba(10, 14, 20, 0.92);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.nav__links { display: flex; gap: 2rem; align-items: center; }
.nav__links a {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--dim);
  text-decoration: none;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.nav__links a:hover { color: var(--ink); }
.nav__links a.is-active { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.75rem 1.75rem;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.btn--sm { padding: 0.6rem 1.25rem; font-size: 0.75rem; }
.btn--solid { background: var(--accent); color: var(--bg); }
.btn--solid:hover { opacity: 0.85; transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn--ghost:hover { background: rgba(0, 180, 255, 0.1); transform: translateY(-1px); }

/* ---------- Section shell ---------- */
.section { padding: 7rem 2rem; }
.section__head { margin-bottom: 3.5rem; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
}
h2 {
  font-family: var(--mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0;
}
.accent { color: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg);
}
.hero__grid,
.hero__reveal,
.hero__vignette { position: absolute; inset: 0; }
.hero__grid {
  background-image: radial-gradient(circle at center, rgba(0, 180, 255, 0.18) 1.2px, transparent 1.4px);
  background-size: 24px 24px;
  background-position: center;
}
.hero__reveal {
  background-image: radial-gradient(circle at center, rgba(0, 180, 255, 0.45) 2px, transparent 2.2px);
  background-size: 24px 24px;
  background-position: center;
  opacity: 0;
  transition: opacity 0.2s ease;
  --mx: -200px;
  --my: -200px;
  -webkit-mask-image: radial-gradient(circle at var(--mx) var(--my), #000 80px, transparent 140px);
  mask-image: radial-gradient(circle at var(--mx) var(--my), #000 80px, transparent 140px);
}
.hero.is-hovering .hero__reveal { opacity: 1; }
.hero__vignette {
  background: radial-gradient(ellipse at center, transparent 40%, var(--bg) 100%);
  pointer-events: none;
}
.hero__content {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 0 1.5rem;
  max-width: 780px;
}
.hero__eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 1.25rem;
}
.hero__name {
  font-family: var(--mono);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}
.hero__role {
  font-family: var(--mono);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--accent);
  min-height: 2em;
  margin-bottom: 1.75rem;
}
.cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--accent);
  margin-left: 3px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}
.hero__intro {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.75;
  max-width: 560px;
  margin: 0 auto 2.5rem;
}
.hero__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero__socials { display: flex; gap: 1.5rem; justify-content: center; margin-top: 2.5rem; }
.hero__socials a { color: var(--dim); display: inline-flex; transition: color 0.2s ease; }
.hero__socials a:hover { color: var(--accent); }

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  opacity: 0.4;
}
.hero__scroll span {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.15em;
}
.hero__scroll-line {
  width: 1px;
  height: 32px;
  background: var(--dim);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
@keyframes pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

/* ---------- About ---------- */
.about__inner { max-width: var(--maxw); margin: 0 auto; }
.about__body {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 3rem;
  align-items: start;
  margin-bottom: 4.5rem;
}

/* Headshot */
.about__photo {
  position: relative;
  aspect-ratio: 4 / 5;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--card);
  transition: border-color 0.25s ease;
}
.about__photo:hover { border-color: rgba(0, 180, 255, 0.45); }
.about__photo img { width: 100%; height: 100%; object-fit: cover; }
.about__photo-ph {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  color: var(--dim);
  border: 1px dashed var(--border);
  border-radius: 6px;
  background: radial-gradient(circle at center, rgba(0, 180, 255, 0.07) 1px, transparent 1.4px) 0 0 / 18px 18px;
}
.about__photo-name { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); }
.about__photo-hint { font-family: var(--mono); font-size: 0.66rem; color: var(--dim); letter-spacing: 0.03em; }

/* About text */
.about__text p { color: var(--muted); font-size: 1rem; line-height: 1.8; margin: 0 0 1.25rem; max-width: 62ch; }
.about__edit { color: var(--dim); font-style: italic; }

.about__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin: 2rem 0 0;
}
.about__facts > div { background: var(--card); padding: 1rem 1.15rem; }
.about__facts dt {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 0.35rem;
}
.about__facts dd { margin: 0; font-size: 0.85rem; color: var(--ink); }

/* Personal interests */
.about__interests-head { margin-bottom: 1.5rem; }
.interests {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}
.interest {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.5rem;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.interest:hover { border-color: rgba(0, 180, 255, 0.4); transform: translateY(-3px); }
.interest__head { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 1rem; color: var(--accent); }
.interest__head h3 { font-family: var(--mono); font-size: 0.9rem; font-weight: 700; color: var(--ink); margin: 0; }
.interest ul { list-style: none; margin: 0; padding: 0; }
.interest li {
  position: relative;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
  padding: 0.45rem 0 0.45rem 1.1rem;
  border-bottom: 1px solid rgba(30, 45, 64, 0.35);
}
.interest li:last-child { border-bottom: 0; }
.interest li::before { content: "\25B8"; position: absolute; left: 0; color: var(--accent); font-size: 0.72rem; top: 0.55rem; }
.interest__link {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.interest__link:hover { border-bottom-color: var(--accent); }
.interest li a { color: inherit; text-decoration: none; transition: color 0.2s ease; }
.interest li a:hover { color: var(--accent); }
.spotify-ico { width: 13px; height: 13px; margin-left: 0.4rem; vertical-align: -0.12em; color: #1DB954; }
.map-ico { width: 13px; height: 13px; margin-left: 0.4rem; vertical-align: -0.12em; color: #EA4335; }

@media (max-width: 720px) {
  .about__body { grid-template-columns: 1fr; gap: 2rem; }
  .about__photo { max-width: 280px; }
}

/* ---------- Projects ---------- */
.projects { max-width: var(--maxw); margin: 0 auto; }
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}
.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  cursor: pointer;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}
.card--highlight { border-color: rgba(0, 180, 255, 0.2); }
.card:hover {
  border-color: rgba(0, 180, 255, 0.5);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 180, 255, 0.08);
  background: #1a2436;
}
.card__stretch { position: absolute; inset: 0; z-index: 1; border-radius: inherit; }
.card__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; }
.card__top h3 {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  line-height: 1.3;
}
.card__links { display: flex; gap: 0.6rem; flex-shrink: 0; }
.card__links a { position: relative; z-index: 2; color: var(--dim); display: inline-flex; transition: color 0.2s ease; }
.card__links a:hover { color: var(--accent); }
.card__desc { font-size: 0.875rem; color: var(--muted); line-height: 1.65; margin: 0; flex-grow: 1; }
.card__desc a {
  position: relative;
  z-index: 2;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 180, 255, 0.35);
  transition: border-color 0.2s ease;
}
.card__desc a:hover { border-bottom-color: var(--accent); }

/* ---------- Tags ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  color: var(--accent);
  background: rgba(0, 180, 255, 0.09);
  border: 1px solid rgba(0, 180, 255, 0.25);
}
.tag[data-tag="blue"]   { color: var(--blue);   background: rgba(56, 189, 248, 0.09);  border-color: rgba(56, 189, 248, 0.25); }
.tag[data-tag="purple"] { color: var(--purple); background: rgba(167, 139, 250, 0.09); border-color: rgba(167, 139, 250, 0.25); }
.tag[data-tag="plain"]  { color: var(--dim);    background: transparent;               border-color: var(--border); }

/* ---------- Resume ---------- */
.resume { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.resume__inner { max-width: var(--maxw); margin: 0 auto; }
.resume__head { display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; gap: 1rem; }
.resume__cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 4rem; }
.resume__label {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 1.75rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.resume__label--spaced { margin-top: 2.5rem; }

/* Skills */
.skill-group { margin-bottom: 2rem; }
.skill-group__title {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}
.skill { margin-bottom: 0.9rem; }
.skill__row { display: flex; justify-content: space-between; margin-bottom: 0.35rem; }
.skill__row span { font-family: var(--mono); font-size: 0.78rem; color: var(--ink); }
.skill__pct { font-size: 0.7rem !important; color: var(--dim) !important; }
.skill__track { height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; }
.skill__fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0, 180, 255, 0.4);
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Certifications */
.cert {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(30, 45, 64, 0.35);
}
.cert__name { font-family: var(--mono); font-size: 0.8rem; color: var(--ink); margin: 0 0 0.15rem; }
.cert__date { font-size: 0.72rem; color: var(--dim); margin: 0; }
.cert__date a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.2s ease; }
.cert__date a:hover { border-bottom-color: var(--accent); }
.badge {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  white-space: nowrap;
}
.badge--earned   { color: var(--accent); background: rgba(0, 180, 255, 0.1); border: 1px solid rgba(0, 180, 255, 0.3); }
.badge--progress { color: var(--amber);  background: rgba(245, 158, 11, 0.1); border: 1px solid rgba(245, 158, 11, 0.3); }

/* Education */
.edu { margin-bottom: 2.5rem; }
.edu__period { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); letter-spacing: 0.1em; margin: 0 0 0.35rem; }
.edu__title { font-family: var(--mono); font-size: 0.95rem; font-weight: 700; color: var(--ink); margin: 0 0 0.15rem; }
.edu__meta { font-size: 0.8rem; color: var(--dim); margin: 0 0 0.5rem; }
.edu .tags { margin-top: 0.35rem; }

/* Experience timeline */
.timeline { display: block; }
.tl-item { position: relative; padding-left: 1.5rem; padding-bottom: 2rem; border-left: 1px solid var(--border); }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute;
  left: -4px;
  top: 4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px rgba(0, 180, 255, 0.6);
}
.tl-period { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); letter-spacing: 0.1em; margin: 0 0 0.35rem; }
.tl-title { font-family: var(--mono); font-size: 0.9rem; font-weight: 700; color: var(--ink); margin: 0 0 0.15rem; }
.tl-org { font-size: 0.8rem; color: var(--dim); margin: 0 0 0.75rem; }
.tl-item ul { margin: 0; padding-left: 1rem; }
.tl-item li { font-size: 0.85rem; color: var(--muted); line-height: 1.65; margin-bottom: 0.3rem; }

/* ---------- Footer ---------- */
.footer { padding: 2.5rem 2rem; border-top: 1px solid var(--border); background: var(--bg); }
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer__copy { font-family: var(--mono); font-size: 0.75rem; color: var(--dim); margin: 0; }
.footer__links { display: flex; gap: 1.5rem; }
.footer__links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--dim);
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer__links a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .nav__inner { padding: 0 1.25rem; }
  .nav__links { gap: 1.25rem; }
  .section { padding: 5rem 1.25rem; }
  .footer { padding: 2.5rem 1.25rem; }
  .resume__cols { gap: 2.5rem; }
}

/* ---------- Accessibility / motion ---------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

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