/* ==========================================================================
   Combined Portfolio — V1 theme + Live sections
   ========================================================================== */

:root {
  --bg: #0b1120;
  --surface: #111827;
  --card: #172033;
  --text: #f8fafc;
  --muted: #94a3b8;
  --line: rgba(148, 163, 184, 0.16);
  --accent: #38bdf8;
  --green: #22c55e;
  --max: 1160px;
  --nav-h: 72px;
  --section-y: clamp(3.75rem, 6vw, 5.5rem);
  --gutter: clamp(1.125rem, 3.5vw, 2.75rem);
  --measure: 42rem;
  --leading-body: 1.75;
  --leading-tight: 1.2;
  --leading-heading: 1.15;
  --space-block: 1.125rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: var(--leading-body);
  overflow-x: clip;
  min-width: 320px;
  letter-spacing: 0.01em;
}

main {
  overflow-x: clip;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: min(var(--max), calc(100% - (var(--gutter) * 2)));
  margin-inline: auto;
}

section[id] {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 0.75rem;
  z-index: 200;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  background: var(--accent);
  color: #06111d;
  font-weight: 700;
  font-size: 0.9rem;
  transform: translateY(-200%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

#main-content:focus {
  outline: none;
}

/* Navigation — V1
   -------------------------------------------------------------------------- */

.site-nav-bar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(11, 17, 32, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.logo span {
  color: var(--accent);
}

.logo:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 4px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 1.35rem;
  align-items: center;
  font-size: 0.875rem;
  color: var(--muted);
  list-style: none;
  max-width: min(52rem, 72vw);
}

.nav-links li {
  display: flex;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
}

.nav-cta {
  padding: 9px 15px;
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: 999px;
  color: var(--accent) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.5rem;
  border-radius: 8px;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  transition: transform 280ms ease, opacity 280ms ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* Hero — V1
   -------------------------------------------------------------------------- */

.hero {
  min-height: auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 70px);
  align-items: center;
  padding-top: calc(var(--nav-h) + clamp(1.5rem, 4vw, 2.5rem));
  padding-bottom: var(--section-y);
}

.hero-content,
.hero-image,
.about-grid > div,
.timeline article > div,
.skill-card,
.project,
.lab-card,
.education > article,
.contact form {
  min-width: 0;
}

.eyebrow {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  max-width: 100%;
  color: #a5f3fc;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.2);
  padding: 7px 12px;
  border-radius: 999px;
  font-size: clamp(0.68rem, 2vw, 0.82rem);
  margin-bottom: 22px;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 14px var(--green);
  flex-shrink: 0;
}

.hero h1 {
  font-size: clamp(2rem, 4.8vw, 4.25rem);
  line-height: var(--leading-heading);
  letter-spacing: -0.035em;
  max-width: 18ch;
  font-weight: 700;
  overflow-wrap: break-word;
  text-wrap: balance;
}

.gradient {
  background: linear-gradient(100deg, #f8fafc, #38bdf8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-content > p {
  font-size: clamp(1rem, 2.1vw, 1.125rem);
  color: var(--muted);
  max-width: var(--measure);
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 clamp(1.5rem, 3vw, 2rem);
  overflow-wrap: break-word;
  line-height: var(--leading-body);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 700;
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  border: 1px solid var(--line);
  transition: transform 280ms ease;
  text-align: center;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn.primary {
  background: var(--accent);
  color: #06111d;
  border-color: var(--accent);
}

.btn:hover {
  transform: translateY(-2px);
}

.hero-image {
  position: relative;
  width: 100%;
  max-width: 420px;
  justify-self: end;
  margin: 0;
}

.photo-wrap {
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}

.photo-wrap img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center 43%;
}

.photo-caption {
  position: absolute;
  left: 20px;
  bottom: 20px;
  right: 20px;
  background: rgba(11, 17, 32, 0.88);
  border: 1px solid var(--line);
  backdrop-filter: blur(10px);
  padding: 12px 15px;
  border-radius: 13px;
  font-size: 0.85rem;
}

.photo-caption strong {
  display: block;
}

.photo-caption span {
  color: var(--muted);
}

/* Sections — V1 base
   -------------------------------------------------------------------------- */

.section-block {
  padding-block: var(--section-y);
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: flex-start;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.head {
  max-width: var(--measure);
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.kicker {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

h2 {
  font-size: clamp(1.85rem, 3.6vw, 2.85rem);
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  margin-top: 0.35rem;
  font-weight: 700;
  overflow-wrap: break-word;
  text-wrap: balance;
  max-width: 22ch;
}

h3 {
  overflow-wrap: break-word;
  line-height: 1.35;
  letter-spacing: -0.015em;
}

.lead {
  color: var(--muted);
  max-width: 34rem;
  line-height: var(--leading-body);
  font-size: clamp(1rem, 1.8vw, 1.08rem);
}

.section-block p {
  max-width: var(--measure);
}

/* About — V1
   -------------------------------------------------------------------------- */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 60px);
}

.about-grid > div:first-child p {
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  margin-bottom: var(--space-block);
  line-height: var(--leading-body);
}

.about-grid > div:first-child p:last-child {
  margin-bottom: 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.stat {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.35rem 1.5rem;
  border-radius: 18px;
}

.stat strong {
  font-size: 1.8rem;
  display: block;
  font-weight: 700;
}

.stat span {
  color: var(--muted);
  font-size: 0.9rem;
  display: block;
  margin-top: 0.4rem;
  line-height: 1.45;
}

/* Education — Live (V1 colors)
   -------------------------------------------------------------------------- */

.education {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.125rem;
  margin-bottom: 1.125rem;
}

.education > article {
  border: 1px solid var(--line);
  padding: 1.5rem 1.625rem;
  border-radius: 13px;
  background: var(--card);
}

.edu-year {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0;
}

.education h3 {
  font-size: 1.125rem;
  margin: 0.5rem 0 0.65rem;
  font-weight: 600;
}

.education p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: var(--leading-body);
}

.training {
  border: 1px solid var(--line);
  padding: 1rem 1.25rem;
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: var(--leading-body);
  background: var(--card);
}

.training b {
  color: var(--text);
}

/* Experience — Live (V1 colors)
   -------------------------------------------------------------------------- */

.timeline {
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 5px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.timeline article {
  position: relative;
  display: grid;
  grid-template-columns: minmax(9.5rem, 11rem) 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
  padding-bottom: 2rem;
}

.timeline article:last-child {
  padding-bottom: 0;
}

.timeline article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.timeline time {
  padding-left: 30px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.55;
}

.timeline article > div {
  border: 1px solid var(--line);
  padding: 1.35rem 1.5rem;
  border-radius: 13px;
  background: var(--card);
}

.timeline h3 {
  margin: 0 0 0.35rem;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 600;
  line-height: 1.4;
}

.timeline .company {
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
}

.timeline p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: var(--leading-body);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  list-style: none;
  padding: 0;
}

.tags li {
  padding: 0.35rem 0.65rem;
  border-radius: 7px;
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid var(--line);
  color: #cbd5e1;
  font-size: 0.8125rem;
  line-height: 1.35;
}

/* Skills — V1
   -------------------------------------------------------------------------- */

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

.skill-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem 1.625rem;
}

.skill-card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.0625rem;
  font-weight: 600;
}

.skill-card p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
  word-spacing: 0.02em;
}

/* Projects — V1
   -------------------------------------------------------------------------- */

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

.project {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem 1.625rem;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.project-number {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.project h3 {
  font-size: 1.25rem;
  margin: 0.25rem 0 0.5rem;
  font-weight: 600;
  line-height: 1.35;
}

.project p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: var(--leading-body);
  flex: 1;
}

.project .tags {
  margin-top: auto;
  padding-top: 1.25rem;
}

/* Research — V1
   -------------------------------------------------------------------------- */

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

.lab-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem 1.625rem;
}

.lab-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
}

.lab-card p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: var(--leading-body);
}

.lab-card a {
  display: inline-block;
  margin-top: 14px;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.88rem;
}

.lab-card a:hover {
  text-decoration: underline;
}

.lab-card a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.lab-status {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: var(--leading-body);
}

.lab-status a {
  color: var(--accent);
  font-weight: 700;
}

/* Contact — Live (V1 colors)
   -------------------------------------------------------------------------- */

.contact {
  background: linear-gradient(180deg, transparent, rgba(56, 189, 248, 0.035));
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 5vw, 70px);
  align-items: start;
}

.contact h2 {
  font-size: clamp(1.85rem, 3.6vw, 2.85rem);
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  max-width: 18ch;
}

.contact-links {
  border-top: 1px solid var(--line);
  margin-top: 25px;
  list-style: none;
  padding: 0;
}

.contact-links a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 44px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.85rem;
  transition: color 280ms ease;
}

.contact-links a:hover,
.contact-links a:focus-visible {
  color: var(--accent);
}

.contact-links a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.contact-links span {
  color: var(--muted);
  font-size: 0.75rem;
  flex-shrink: 0;
}

.contact-links strong {
  font-weight: 600;
  text-align: right;
  overflow-wrap: anywhere;
  min-width: 0;
}

.contact form {
  border: 1px solid var(--line);
  border-radius: 15px;
  padding: 1.5rem 1.625rem;
  background: rgba(255, 255, 255, 0.03);
}

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

.contact label {
  display: block;
  font-size: 0.875rem;
  color: #c8d6e3;
  margin-bottom: 1rem;
  line-height: 1.45;
}

.contact input,
.contact textarea {
  display: block;
  width: 100%;
  max-width: 100%;
  margin-top: 0.5rem;
  background: #071421;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem 0.85rem;
  line-height: 1.5;
  font: inherit;
  font-size: 16px;
}

@media (min-width: 768px) {
  .contact input,
  .contact textarea {
    font-size: 0.9rem;
  }
}

.contact input:focus-visible,
.contact textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}

.contact textarea {
  resize: vertical;
  min-height: 120px;
}

.form-hint {
  color: #6f8398;
  font-size: 0.8125rem;
  margin-top: 1rem;
  line-height: 1.55;
}

.form-hint code {
  font-size: 0.85em;
  color: #94a3b8;
}

.form-status {
  min-height: 1.25rem;
  font-size: 0.85rem;
  margin: 8px 0 4px;
  color: var(--accent);
}

.form-status.is-error {
  color: #fca5a5;
}

.contact form .btn {
  width: 100%;
  margin-top: 4px;
  cursor: pointer;
}

/* Footer — Live
   -------------------------------------------------------------------------- */

footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 30px;
  color: var(--muted);
  font-size: 0.85rem;
}

.foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.foot strong {
  display: block;
  color: var(--text);
  font-weight: 700;
}

.foot a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.foot a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.foot small {
  color: var(--muted);
  font-size: 0.8rem;
  display: block;
}

/* Reduced motion
   -------------------------------------------------------------------------- */

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }

  .btn:hover {
    transform: none;
  }
}

/* Responsive — Desktop large (1280px+)
   Default styles above apply. */

/* Laptop (1024px – 1279px) */
@media (max-width: 1279px) {
  .nav-links {
    gap: 0.35rem 1rem;
    font-size: 0.8125rem;
  }

  .hero {
    grid-template-columns: 1fr 1fr;
    gap: clamp(1.5rem, 4vw, 3rem);
  }

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

/* Tablet landscape / small laptop (768px – 1023px) */
@media (max-width: 1023px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    z-index: 99;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100dvh - var(--nav-h));
    overflow-y: auto;
    padding: 1rem var(--gutter);
    background: rgba(11, 17, 32, 0.98);
    border-bottom: 1px solid var(--line);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    transition: transform 280ms ease, opacity 280ms ease, visibility 280ms ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 0.75rem 0.5rem;
    border-bottom: 1px solid var(--line);
  }

  .nav-links a:last-child {
    border-bottom: none;
    margin-top: 0.5rem;
    justify-content: center;
  }

  .hero,
  .about-grid,
  .lab,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: clamp(1.75rem, 4vw, 2.5rem);
  }

  .hero-image {
    max-width: min(520px, 100%);
    justify-self: center;
    order: -1;
  }

  .hero-content {
    text-align: left;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .section-head h2,
  .contact h2 {
    max-width: none;
  }

  .hero h1 {
    max-width: none;
  }

  .timeline article {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

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

/* Tablet portrait (600px – 767px) */
@media (max-width: 767px) {
  .timeline article {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding-left: 1.75rem;
  }

  .timeline time {
    padding-left: 0;
  }

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

  .contact-links a {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .contact-links strong {
    text-align: left;
  }

  .photo-caption {
    left: 12px;
    right: 12px;
    bottom: 12px;
    font-size: 0.78rem;
  }

  .project {
    min-height: auto;
  }
}

/* Mobile (425px – 599px) */
@media (max-width: 599px) {
  .skill-grid,
  .project-grid,
  .stats,
  .lab {
    grid-template-columns: 1fr;
  }

  .section-head {
    display: block;
  }

  .lead {
    margin-top: 0;
  }

  .actions {
    flex-direction: column;
    width: 100%;
  }

  .actions .btn {
    width: 100%;
  }

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

  .foot small:last-child {
    margin-top: 0.5rem;
  }

  .stat strong {
    font-size: 1.5rem;
  }

  .project h3 {
    font-size: 1.15rem;
  }
}

/* Small mobile (320px – 424px) */
@media (max-width: 424px) {
  :root {
    --nav-h: 64px;
    --gutter: 0.875rem;
  }

  .section-block {
    padding-block: clamp(2.25rem, 4vw, 3rem);
  }

  .hero h1 {
    font-size: clamp(1.85rem, 8vw, 2.35rem);
    line-height: var(--leading-heading);
  }

  .logo {
    font-size: 1rem;
  }

  .eyebrow {
    border-radius: 12px;
    width: 100%;
  }

  .training {
    font-size: 0.8rem;
    line-height: 1.5;
  }

  .contact form {
    padding: 1rem;
  }

  .contact h2 {
    font-size: clamp(1.65rem, 7vw, 2rem);
  }
}