@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --color-bg: #0a0a0f;
  --color-bg-section: #0f0f18;
  --color-bg-alt: #13131e;
  --color-bg-card: #16161f;
  --color-bg-light: #f8f8fb;
  --color-text: #f0f0f8;
  --color-text-muted: #9898b0;
  --color-text-soft: #6a6a82;
  --color-border: rgba(255, 255, 255, 0.07);
  --color-border-strong: rgba(255, 255, 255, 0.12);
  --color-accent: #7b61ff;
  --color-accent-hover: #9b86ff;
  --color-accent-glow: rgba(123, 97, 255, 0.25);
  --color-gold: #f4b942;
  --color-teal: #2dd4bf;

  --max-width: 1080px;
  --gutter: 1.5rem;
  --radius: 12px;
  --radius-sm: 8px;

  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05);
  --shadow-card-hover: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(123, 97, 255, 0.3);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-feature-settings: "ss01", "cv11";
}

h1, h2, h3, h4, p, ul, ol {
  margin: 0;
  padding: 0;
}

ul {
  list-style: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 150ms ease;
}

a:hover {
  color: var(--color-accent-hover);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 3px;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* ── Header / Nav ─────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem var(--gutter);
}

.nav__brand {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  color: var(--color-text);
  background: linear-gradient(135deg, #fff 0%, var(--color-accent-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
}

.nav__links a {
  display: inline-block;
  padding: 0.25rem 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 150ms ease;
}

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

/* ── Hero ─────────────────────────────────────────── */

.hero {
  position: relative;
  padding: 8rem 0 7rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 60% 0%, rgba(123, 97, 255, 0.18) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(45, 212, 191, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 100%, rgba(244, 185, 66, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

/* subtle dot-grid texture */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0) 100%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0) 100%);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-teal);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.75rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid rgba(45, 212, 191, 0.25);
  border-radius: 999px;
  background: rgba(45, 212, 191, 0.06);
}

.hero__title {
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
  max-width: 14ch;
  background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 500;
  color: var(--color-accent-hover);
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.hero__intro {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-bottom: 3rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ── Buttons ──────────────────────────────────────── */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
  white-space: nowrap;
  font-family: inherit;
}

.button--primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, #5b3fd4 100%);
  color: #ffffff;
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.button--primary:hover {
  background: linear-gradient(135deg, var(--color-accent-hover) 0%, var(--color-accent) 100%);
  color: #ffffff;
  box-shadow: 0 0 30px rgba(123, 97, 255, 0.4);
  transform: translateY(-1px);
}

.button--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.button--ghost:hover {
  background-color: rgba(255, 255, 255, 0.06);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

/* ── Sections ─────────────────────────────────────── */

.section {
  padding: 6rem 0;
  border-top: 1px solid var(--color-border);
}

.section__head {
  max-width: 60ch;
  margin-bottom: 3.5rem;
}

.section__eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}

.section__title {
  font-size: clamp(1.9rem, 3.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.section__lede {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.section--feature {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.section--feature::before {
  content: '';
  position: absolute;
  top: -60%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123, 97, 255, 0.07) 0%, transparent 70%);
  pointer-events: none;
}

.section--contact {
  padding-bottom: 7rem;
}

/* ── Project cards ─────────────────────────────────── */

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 2rem;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
  min-height: 240px;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-teal));
  opacity: 0;
  transition: opacity 200ms ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card-hover);
  color: var(--color-text);
}

.card:hover::before {
  opacity: 1;
}

.card__tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background-color: rgba(123, 97, 255, 0.1);
  border: 1px solid rgba(123, 97, 255, 0.2);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

.card__title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.card__body {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex-grow: 1;
}

.card__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 150ms ease;
}

.card:hover .card__link {
  color: var(--color-accent-hover);
  gap: 0.5rem;
}

/* ── Feature grid (ref.team) ──────────────────────── */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.feature {
  padding: 2.25rem;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  position: relative;
}

.feature::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.4;
}

.feature__title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
  color: var(--color-text);
}

.feature__body {
  font-size: 0.975rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.feature__cta {
  display: flex;
  justify-content: flex-start;
}

/* ── Meta row (research / writing / resume) ────────── */

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.meta-row__link {
  display: inline-flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.1rem 1.4rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg-card);
  color: var(--color-text);
  transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
  min-width: 240px;
}

.meta-row__link:hover {
  border-color: rgba(123, 97, 255, 0.4);
  box-shadow: 0 0 0 1px rgba(123, 97, 255, 0.15), 0 8px 24px rgba(0,0,0,0.3);
  transform: translateY(-2px);
  color: var(--color-text);
}

.meta-row__label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-soft);
}

.meta-row__value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent-hover);
}

/* ── Publication links ─────────────────────────────── */

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.5rem;
}

.pub-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: border-color 150ms, background 150ms, color 150ms, transform 150ms;
}

.pub-link:hover {
  color: var(--color-text);
  border-color: var(--color-border-strong);
  background: var(--color-bg-alt);
  transform: translateY(-1px);
}

.pub-link__platform {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
}

.pub-link__platform--substack {
  background: rgba(255, 103, 25, 0.15);
  color: #ff6719;
}

.pub-link__platform--medium {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-muted);
}

/* ── ORCID publications list ───────────────────────── */

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.pub-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.pub-item__meta {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-top: 0.1rem;
}

.pub-item__year {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.pub-item__type {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-text-muted);
}

.pub-item__body {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.pub-item__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  text-decoration: none;
  transition: color 150ms;
}

a.pub-item__title:hover {
  color: var(--color-accent);
}

.pub-item__journal {
  font-size: 0.875rem;
  color: var(--color-teal);
  font-style: italic;
}

.pub-item__doi {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-decoration: none;
  font-family: monospace;
  transition: color 150ms;
}

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

/* ── Writing card grid ─────────────────────────────── */

.writing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.wcard {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  color: var(--color-text);
  transition: transform 200ms, box-shadow 200ms, border-color 200ms;
}

.wcard:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-strong);
  box-shadow: 0 16px 36px rgba(0,0,0,0.45);
  color: var(--color-text);
}

.wcard__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  background: var(--color-bg-alt);
}

.wcard__img--blank {
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg-section) 100%);
}

.wcard__body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.1rem 1.25rem 1.25rem;
  flex: 1;
}

.wcard__meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
}

.badge--substack {
  background: rgba(255, 103, 25, 0.15);
  color: #ff6719;
}

.badge--medium {
  background: rgba(255,255,255,0.07);
  color: var(--color-text-soft);
}

.wcard__source {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-soft);
}

.wcard__title {
  font-size: 0.975rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--color-text);
  flex: 1;
}

.wcard__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.wcard__date {
  font-size: 0.75rem;
  color: var(--color-text-soft);
  font-weight: 500;
  margin-top: auto;
  padding-top: 0.5rem;
}

/* ── Placeholder feeds ─────────────────────────────── */

.placeholder {
  padding: 2.5rem;
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  background-color: var(--color-bg-card);
  text-align: center;
}

.placeholder__text {
  font-size: 0.9rem;
  color: var(--color-text-soft);
  font-style: italic;
}

/* ── Contact layout ────────────────────────────────── */

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 4rem;
  align-items: start;
}

/* ── Contact form ──────────────────────────────────── */

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-soft);
}

.form-input {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 0.975rem;
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
  -webkit-appearance: none;
}

.form-input::placeholder {
  color: var(--color-text-soft);
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(123, 97, 255, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
  line-height: 1.6;
}

.form-footer {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.form-status {
  font-size: 0.9rem;
  font-weight: 500;
}

.form-status--ok  { color: var(--color-teal); }
.form-status--err { color: #f87171; }

/* ── Contact list ──────────────────────────────────── */

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: background-color 150ms ease;
}

.contact-list__label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-soft);
  min-width: 100px;
}

.contact-list a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 150ms ease;
}

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

/* ── Footer ────────────────────────────────────────── */

.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer__copy {
  font-size: 0.875rem;
  color: var(--color-text-soft);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
}

.site-footer__links a {
  font-size: 0.875rem;
  color: var(--color-text-soft);
  font-weight: 500;
  transition: color 150ms ease;
}

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

/* ── Responsive ────────────────────────────────────── */

@media (max-width: 880px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 640px) {
  .hero {
    padding: 5rem 0 4rem;
  }

  .section {
    padding: 4.5rem 0;
  }

  .cards,
  .feature-grid,
  .contact-layout,
  .writing-grid {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    gap: 2.5rem;
  }

  .nav {
    padding: 0.85rem var(--gutter);
  }

  .nav__links {
    gap: 0.25rem 1rem;
    width: 100%;
  }

  .nav__links a {
    font-size: 0.82rem;
  }

  .hero__cta {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__cta .button {
    width: 100%;
    text-align: center;
    justify-content: center;
  }

  .meta-row__link {
    min-width: 0;
    width: 100%;
  }

  .contact-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 360px) {
  :root {
    --gutter: 1.1rem;
  }

  .hero__title {
    font-size: 2.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}