/* ─────────────────────────────────────────────────────────────
   Joseph Lang — Portfolio Website
   Pure CSS, no external dependencies
   ──────────────────────────────────────────────────────────── */

/* ── Custom Properties ────────────────────────────────────── */
:root {
  --bg:          #080d18;
  --bg-alt:      #0c1220;
  --surface:     #111827;
  --card:        #162033;
  --card-hover:  #1e2f4a;
  --border:      #1e3050;

  --accent:      #00c8ff;
  --accent-dim:  #0099cc;
  --accent2:     #7c3aed;
  --accent2-dim: #5b21b6;

  --text:        #e2e8f0;
  --text-muted:  #94a3b8;
  --text-faint:  #4b6080;

  --radius:      0.75rem;
  --radius-sm:   0.375rem;
  --transition:  0.2s ease;

  --font-sans: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

/* ── Reset ────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

/* ── Container ────────────────────────────────────────────── */
.container {
  width: min(1200px, 100% - 3rem);
  margin-inline: auto;
}

/* ── Section shared ───────────────────────────────────────── */
.section {
  padding-block: 6rem;
}

.section--alt {
  background-color: var(--bg-alt);
}

.section__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section__heading {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3rem;
  line-height: 1.2;
}

/* ── Navigation ───────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(8, 13, 24, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1rem;
}

.nav__brand {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.nav__brand:hover { color: var(--accent); }

.nav__divider { color: var(--text-faint); font-size: 0.75rem; }

.nav__sib { font-size: 0.8rem; color: var(--text-faint); }
.nav__sib:hover { color: var(--text-muted); }

.nav__links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav__links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav__links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav__links a:hover {
  color: var(--text);
}

.nav__links a:hover::after {
  width: 100%;
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg);
}

.btn--primary:hover {
  background: var(--accent-dim);
  transform: translateY(-1px);
}

.btn--outline {
  border: 1px solid var(--border);
  color: var(--text);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.25;
  pointer-events: none;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0, 200, 255, 0.07) 0%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  padding-block: 8rem 6rem;
  max-width: 700px;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.hero__name {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__title {
  font-size: clamp(1rem, 2.5vw, 1.375rem);
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.hero__cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll-hint span {
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, transparent, var(--accent));
  margin-inline: auto;
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 0; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* ── About ────────────────────────────────────────────────── */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about__text p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  font-size: 1.0125rem;
}

.about__highlights {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.about__highlights li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--text);
  font-size: 0.9375rem;
}

.highlight__icon {
  color: var(--accent);
  font-size: 0.6rem;
  margin-top: 0.45rem;
  flex-shrink: 0;
}

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.stat-card__value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-card__label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ── Skills ───────────────────────────────────────────────── */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-card:hover {
  border-color: var(--accent);
  background: var(--card-hover);
  transform: translateY(-3px);
}

.skill-card__icon {
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
}

.skill-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.skill-card__body {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}

.skill-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.skill-card__tags li {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(0, 200, 255, 0.08);
  border: 1px solid rgba(0, 200, 255, 0.2);
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.6rem;
}

/* ── Tech Stack ───────────────────────────────────────────── */
.stack__section {
  margin-top: 5rem;
}

.stack__categories {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.stack__category-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.stack__items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.stack__item {
  font-size: 0.9375rem;
  color: var(--text-muted);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--card);
  transition: all var(--transition);
}

.stack__item:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--card-hover);
  padding-left: 1.1rem;
}

/* ── Projects ─────────────────────────────────────────────── */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
}

.project-card:hover {
  border-color: var(--accent);
  background: var(--card-hover);
  transform: translateY(-3px);
}

.project-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.project-card__type {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent2);
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.25);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.project-card__link {
  font-size: 1.25rem;
  color: var(--text-faint);
  transition: color var(--transition);
  line-height: 1;
}

.project-card__link:hover { color: var(--accent); }

.project-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}

.project-card__body {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}

.project-card__tags li {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.15rem 0.5rem;
}

/* Featured card spans full width */
.project-card--featured {
  grid-column: span 3;
  border-color: var(--accent);
  background: var(--card-hover);
  box-shadow: 0 0 0 1px rgba(0, 200, 255, 0.15), 0 8px 40px rgba(0, 200, 255, 0.08);
}

.project-card--featured .project-card__type {
  font-size: 0.75rem;
  background: rgba(0, 200, 255, 0.12);
  color: var(--accent);
  border-color: rgba(0, 200, 255, 0.25);
}

.project-card--featured .project-card__title { font-size: 1.3rem; }

.project-card--featured .project-card__tags li {
  color: var(--accent);
  background: rgba(0, 200, 255, 0.08);
  border-color: rgba(0, 200, 255, 0.2);
}

.project-card__private {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.project-card__details { margin-top: 0.25rem; }

.project-card__details-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.project-card__detail-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem 1.5rem;
  list-style: disc;
  padding-left: 1.1rem;
}

.project-card__detail-list li {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.projects__github-note {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.projects__github-note a {
  color: var(--accent);
  transition: opacity var(--transition);
}

.projects__github-note a:hover { opacity: 0.75; }

.project-card--cta {
  border-style: dashed;
  display: flex;
  flex-direction: column;
}

/* ── Timeline (Experience) ────────────────────────────────── */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.timeline__item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.timeline__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.timeline__meta {
  padding-top: 0.25rem;
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.timeline__location {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.timeline__company {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  font-family: var(--font-mono);
}

.timeline__role {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

.timeline__bullets {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  list-style: disc;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.timeline__bullets strong {
  color: var(--text);
  font-weight: 600;
}

/* ── Education ────────────────────────────────────────────── */
.edu__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.edu-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: border-color var(--transition), transform var(--transition);
}

.edu-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.edu-card__icon {
  font-size: 1.75rem;
  line-height: 1;
  flex-shrink: 0;
  color: var(--accent);
}

.edu-card__school {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.edu-card__degree {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.edu-card__detail {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.edu-card__date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.edu-card__status {
  background: rgba(0, 200, 255, 0.1);
  border: 1px solid rgba(0, 200, 255, 0.25);
  color: var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.1rem 0.5rem;
  font-size: 0.68rem;
}

/* ── Contact ──────────────────────────────────────────────── */
.contact__inner {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
}

.contact__inner .section__heading {
  margin-bottom: 1rem;
}

.contact__body {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 2rem;
  width: 100%;
  max-width: 420px;
  justify-content: center;
  transition: all var(--transition);
}

.contact__link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0, 200, 255, 0.04);
  transform: translateY(-2px);
}

.contact__link-icon {
  font-size: 1.1rem;
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding-block: 2rem;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.footer p {
  font-size: 0.8125rem;
  color: var(--text-faint);
}

.footer__nav {
  display: flex;
  gap: 1.5rem;
}

.footer__nav a {
  font-size: 0.8rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  transition: color var(--transition);
}

.footer__nav a:hover { color: var(--text-muted); }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1100px) {
  .edu__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .skills__grid,
  .projects__grid {
    grid-template-columns: 1fr 1fr;
  }

  .stack__categories {
    grid-template-columns: repeat(2, 1fr);
  }

  .timeline__item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .timeline__meta {
    display: flex;
    gap: 1rem;
    align-items: center;
  }
}

@media (max-width: 640px) {
  .nav__links {
    gap: 1rem;
    font-size: 0.8rem;
  }

  .hero__cta {
    flex-direction: column;
  }

  .hero__cta .btn {
    width: 100%;
    justify-content: center;
  }

  .skills__grid,
  .projects__grid,
  .stack__categories,
  .edu__grid {
    grid-template-columns: 1fr;
  }

  .about__stats {
    grid-template-columns: 1fr 1fr;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .edu-card {
    flex-direction: column;
    gap: 0.75rem;
  }
}

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

/* ── Print ────────────────────────────────────────────────── */
@media print {
  .nav,
  .hero__scroll-hint,
  .hero__grid-bg {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}