/* ===== Design Tokens ===== */
:root {
  --bg:          #0f172a;
  --surface:     #1e293b;
  --surface-2:   #273449;
  --text:        #e2e8f0;
  --text-muted:  #94a3b8;
  --accent:      #38bdf8;
  --accent-dark: #0ea5e9;
  --border:      #334155;
  --radius:      0.75rem;
  --radius-sm:   0.4rem;
  --font:        'Inter', system-ui, sans-serif;
  --nav-h:       80px;

  /* badge colours by category */
  --c-languages:  #3b82f6;
  --c-frameworks: #8b5cf6;
  --c-tools:      #10b981;
  --c-cloud:      #f59e0b;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { display: block; max-width: 100%; }

/* ===== Navbar ===== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 3rem;
  background: #080f1e;
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
#navbar.scrolled {
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
}
.nav-logo {
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text);
  letter-spacing: -0.03em;
}
.nav-logo:hover { text-decoration: none; color: var(--accent); }
.nav-links {
  list-style: none;
  display: flex;
  gap: 2.5rem;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.nav-links a {
  color: var(--text-muted);
  font-size: 1.25rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* ===== Layout helpers ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2.5rem;
}
.section {
  padding: 6rem 0;
  scroll-margin-top: var(--nav-h);
}
#about {
  padding: 13rem 0;
}
.section-alt {
  background: var(--surface);
}
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 2.5rem;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  height: 3px;
  width: 40px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 0.4rem;
}

/* ===== Fade-in animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: none;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: background 0.2s, border-color 0.2s, color 0.2s, opacity 0.2s;
}
.btn:hover { text-decoration: none; opacity: 0.88; }
.btn-primary  { background: var(--accent); color: #0f172a; }
.btn-outline  { border-color: var(--border); color: var(--text); background: transparent; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost    { color: var(--text-muted); background: transparent; }
.btn-ghost:hover { color: var(--text); }
.btn-sm       { padding: 0.35rem 0.85rem; font-size: 0.82rem; }
.btn-full     { width: 100%; text-align: center; }

/* ===== Hero ===== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  padding: calc(var(--nav-h) + 12rem) 2.5rem 4rem;
  max-width: 1280px;
  margin: 0 auto;
}
.hero-inner {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  width: 100%;
}
.hero-text {
  flex: 1;
  min-width: 0;
}
.hero-avatar {
  flex-shrink: 0;
}
.avatar-placeholder {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.avatar-placeholder svg {
  width: 60%;
  height: 60%;
}
.avatar-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}
@media (max-width: 480px) {
  .hero-inner {
    flex-direction: column-reverse;
    align-items: flex-start;
    gap: 2rem;
  }
  .avatar-placeholder {
    width: 120px;
    height: 120px;
  }
}
.hero-eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.5rem;
}
#hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}
.hero-title {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}
.hero-bio {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 2rem;
}
.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.about-text p { color: var(--text-muted); margin-bottom: 1rem; }
.about-location { display: flex; align-items: center; gap: 0.4rem; }

.about-expertise {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 3.5rem;
}
.expertise-item {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  background: var(--surface);
  transition: transform 0.2s, opacity 0.2s;
  cursor: default;
}
.expertise-item:hover {
  transform: translateY(-2px);
  opacity: 0.92;
}
.expertise-item--blue   { border-color: #3b82f6; }
.expertise-item--purple { border-color: #8b5cf6; }
.expertise-item--sky    { border-color: #38bdf8; }
.expertise-item--green  { border-color: #10b981; }
.expertise-item--amber  { border-color: #f59e0b; }
.expertise-item h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.2rem;
}
.expertise-item p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}
.contact-pill {
  display: inline-block;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: border-color 0.2s, color 0.2s;
  white-space: nowrap;
}
.contact-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* ===== Projects ===== */
.featured-projects {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
@media (min-width: 640px) {
  .featured-projects { grid-template-columns: 1fr 1fr; }
}
.projects-grid {
  display: grid;
  gap: 1rem;
}
@media (min-width: 640px) {
  .projects-grid { grid-template-columns: repeat(3, 1fr); }
}

.project-card {
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s, opacity 0.2s;
}
.project-card:hover {
  transform: translateY(-2px);
  opacity: 0.92;
}
.project-card--featured {
  background: var(--surface-2);
}
.project-card__image {
  width: 100%;
  height: 140px;
  background: var(--surface);
  background-image: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 6px,
    rgba(255,255,255,0.02) 6px,
    rgba(255,255,255,0.02) 12px
  );
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.project-card__image--sm {
  height: 100px;
}
.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.project-card__image-label {
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--border);
}
.project-card__body {
  flex: 1;
  padding: 1.25rem 1.25rem 0;
}
.project-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.project-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.project-card__footer {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 1rem 1.25rem 1.25rem;
}

/* ===== Tech badges ===== */
.tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}
.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  gap: 1rem;
}
@media (min-width: 640px) {
  .skills-grid { grid-template-columns: 1fr 1fr; }
}
.skill-category {
  background: var(--surface);
  border-left: 3px solid transparent;
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.25rem;
}
.skill-category--languages        { border-color: var(--c-languages); }
.skill-category--ml-ai            { border-color: var(--c-frameworks); }
.skill-category--backend-data     { border-color: var(--c-tools); }
.skill-category--cloud-platforms  { border-color: var(--c-cloud); }
.skill-category h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.skill-tag {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  color: #fff;
}
.skill-tag--languages        { background: var(--c-languages); }
.skill-tag--ml-ai            { background: var(--c-frameworks); }
.skill-tag--backend-data     { background: var(--c-tools); }
.skill-tag--cloud-platforms  { background: var(--c-cloud); color: #0f172a; }

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  gap: 3rem;
}
@media (min-width: 640px) {
  .contact-grid { grid-template-columns: 1fr auto; }
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--bg);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  align-self: start;
}
.contact-info p { color: var(--text-muted); font-size: 0.9rem; }

.form-group { margin-bottom: 1.1rem; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
}
.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: border-color 0.2s;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--accent); }
.form-group textarea { resize: vertical; }

.form-status {
  margin-top: 0.75rem;
  font-size: 0.88rem;
  min-height: 1.3em;
}
.form-status.success { color: #34d399; }
.form-status.error   { color: #f87171; }

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 1.2rem; }
}