/* ============================================================
   Afraim Murshed — Portfolio
   Tokens
   ============================================================ */
:root {
  --bg: #0b0c0e;
  --bg-soft: #101114;
  --surface: #16171c;
  --surface-hover: #1b1c22;
  --border: #26272e;
  --border-soft: #1d1e24;
  --text: #ece9e2;
  --text-muted: #94969e;
  --text-faint: #5f6169;
  --accent: #c9a227;
  --accent-bright: #e0bd4a;
  --accent-soft: rgba(201, 162, 39, 0.12);
  --accent-border: rgba(201, 162, 39, 0.35);

  --font-display: 'Space Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --nav-width: 264px;
  --nav-width-collapsed: 76px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body, h1, h2, h3, p, ul, ol, figure {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, textarea { font: inherit; color: inherit; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--font-mono); }

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; color: var(--text); }
h2 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); margin-bottom: 2.5rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #0b0c0e;
  padding: 0.75rem 1.25rem;
  z-index: 999;
  font-weight: 600;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ============================================================
   Eyebrow / signature terminal motif
   ============================================================ */
.eyebrow {
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  margin-bottom: 0.9rem;
  display: inline-block;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.8rem;
  border-radius: 2px;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.btn-primary {
  background: var(--accent);
  color: #0b0c0e;
}
.btn-primary:hover {
  background: var(--accent-bright);
  transform: translateY(-2px);
}
.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: var(--accent-border);
  color: var(--accent-bright);
  transform: translateY(-2px);
}
.btn-small {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
}

/* ============================================================
   Navigation (left sidebar on desktop)
   ============================================================ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--nav-width);
  background: var(--bg-soft);
  border-right: 1px solid var(--border-soft);
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 2rem 1.75rem;
}

.nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-mark {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-bright);
  letter-spacing: -0.02em;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-links {
  margin-top: 3.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
}

.nav-links ul { display: flex; flex-direction: column; gap: 0.35rem; }

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  border-radius: 3px;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), padding-left 0.25s var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
}
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text);
  background: var(--surface);
  padding-left: 0.8rem;
}
.nav-link.active {
  color: var(--accent-bright);
}
.nav-link.active .nav-index { color: var(--accent); }

.nav-footer {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
  width: fit-content;
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-soft);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(201, 162, 39, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(201, 162, 39, 0); }
  100% { box-shadow: 0 0 0 0 rgba(201, 162, 39, 0); }
}

.nav-socials {
  display: flex;
  gap: 1.25rem;
}
.social-link {
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.social-link:hover {
  color: var(--accent-bright);
  border-color: var(--accent-border);
}

.nav-scrim {
  display: none;
}

/* ============================================================
   Layout
   ============================================================ */
main { margin-left: var(--nav-width); }
.site-footer { margin-left: var(--nav-width); }

.section {
  position: relative;
  padding: 7rem 6vw;
  border-bottom: 1px solid var(--border-soft);
}
.section-inner {
  max-width: 920px;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 7rem 6vw;
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.028) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 70% 60% at 30% 40%, black 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 30% 40%, black 10%, transparent 75%);
}
.hero-content { position: relative; max-width: 680px; }

.hero-name {
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin-bottom: 1.75rem;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  color: var(--text);
  font-weight: 500;
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.hero-intro {
  color: var(--text-muted);
  max-width: 540px;
  margin-bottom: 2.5rem;
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-status {
  font-size: 0.85rem;
  color: var(--text-faint);
}
.hero-status .type-target { color: var(--accent-bright); }
.cursor {
  display: inline-block;
  color: var(--accent);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
  font-size: 0.7rem;
  transform: translateY(-1px);
}
@keyframes blink { 50% { opacity: 0; } }

.scroll-cue {
  position: absolute;
  bottom: 2.5rem;
  left: 6vw;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.scroll-cue-line {
  width: 28px;
  height: 1px;
  background: var(--text-faint);
  position: relative;
  overflow: hidden;
}
.scroll-cue-line::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: translateX(-100%);
  animation: scrollLine 2.2s var(--ease) infinite;
}
@keyframes scrollLine {
  0% { transform: translateX(-100%); }
  50% { transform: translateX(0); }
  100% { transform: translateX(100%); }
}

/* ============================================================
   About
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 4rem;
}
.about-copy p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  max-width: 60ch;
}
.about-copy p:last-child { margin-bottom: 0; }

.about-facts {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border-left: 1px solid var(--border);
  padding-left: 1.75rem;
  height: fit-content;
}
.fact { display: flex; flex-direction: column; gap: 0.3rem; }
.fact-label {
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.fact-value { color: var(--text-muted); font-size: 0.92rem; }

/* ============================================================
   Skills
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
}
.skill-card {
  background: var(--bg);
  padding: 2rem;
  transition: background 0.3s var(--ease);
}
.skill-card:hover { background: var(--surface); }
.skill-card h3 { font-size: 1.05rem; margin-bottom: 1rem; }
.skill-card ul { display: flex; flex-direction: column; gap: 0.6rem; }
.skill-card li {
  color: var(--text-muted);
  font-size: 0.92rem;
  padding-left: 1rem;
  position: relative;
}
.skill-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  background: var(--accent);
}

/* ============================================================
   Projects
   ============================================================ */
.project-featured {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  border: 1px solid var(--border);
  margin-bottom: 3rem;
  overflow: hidden;
}
.project-featured-media {
  background:
    radial-gradient(circle at 30% 30%, rgba(201,162,39,0.16), transparent 60%),
    repeating-linear-gradient(135deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 14px),
    var(--surface);
  min-height: 220px;
  display: flex;
  align-items: flex-start;
  padding: 1.5rem;
}
.project-featured-tag {
  border: 1px solid var(--accent-border);
  color: var(--accent-bright);
  font-size: 0.7rem;
  padding: 0.35rem 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.project-featured-body { padding: 2.5rem; }
.project-category {
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.project-featured-body h3 { font-size: 1.5rem; }
.project-featured-body p { color: var(--text-muted); margin-bottom: 1.25rem; }

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.tech-tags li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
}

.project-actions { display: flex; gap: 0.85rem; flex-wrap: wrap; }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.project-card {
  border: 1px solid var(--border);
  padding: 2rem;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.project-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-3px);
}
.project-card p { color: var(--text-muted); margin-bottom: 1.25rem; font-size: 0.95rem; }

/* ============================================================
   Timeline (Experience)
   ============================================================ */
.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 1px solid var(--border);
}
.timeline-item {
  position: relative;
  padding-bottom: 3rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -2.4rem;
  top: 0.3rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline-date { color: var(--accent); font-size: 0.78rem; margin-bottom: 0.4rem; }
.timeline-org { color: var(--text-muted); font-weight: 500; margin-bottom: 0.6rem; }
.timeline-body p:last-child { color: var(--text-muted); max-width: 60ch; }

/* ============================================================
   Education
   ============================================================ */
.education-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.education-card {
  border: 1px solid var(--border);
  padding: 2rem;
}
.education-card p:last-child { color: var(--text-muted); }

/* ============================================================
   Contact
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3.5rem;
}
.contact-info p { color: var(--text-muted); margin-bottom: 1.5rem; max-width: 40ch; }
.contact-email {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
  color: var(--accent-bright);
  border-bottom: 1px solid var(--accent-border);
  padding-bottom: 0.3rem;
  display: inline-block;
  margin-bottom: 2rem;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.contact-email:hover { color: var(--accent); border-color: var(--accent); }
.contact-socials { display: flex; gap: 1.5rem; }

.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-row { display: flex; flex-direction: column; gap: 0.5rem; }
.form-row label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-row input, .form-row textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.85rem 1rem;
  color: var(--text);
  border-radius: 2px;
  transition: border-color 0.25s var(--ease);
  resize: vertical;
}
.form-row input:focus, .form-row textarea:focus {
  border-color: var(--accent);
  outline: none;
}
.form-note { color: var(--text-faint); font-size: 0.72rem; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  padding: 3rem 6vw;
  border-top: 1px solid var(--border-soft);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.footer-name { font-family: var(--font-display); font-weight: 600; }
.footer-email { color: var(--text-muted); font-size: 0.9rem; }
.footer-socials { display: flex; gap: 1.5rem; }
.footer-copy { color: var(--text-faint); font-size: 0.8rem; width: 100%; text-align: center; margin-top: 1rem; }

/* ============================================================
   Scroll reveal
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1080px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-facts { border-left: none; padding-left: 0; border-top: 1px solid var(--border); padding-top: 1.5rem; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  :root { --nav-width: 0px; }

  .site-nav {
    width: 100%;
    height: auto;
    padding: 1.25rem 6vw;
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
    flex-direction: row;
    align-items: center;
  }
  .nav-top { width: 100%; }
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: min(320px, 82vw);
    background: var(--bg-soft);
    border-left: 1px solid var(--border);
    padding: 6rem 2rem 2rem;
    margin-top: 0;
    transform: translateX(100%);
    transition: transform 0.4s var(--ease);
    z-index: 150;
  }
  .nav-links.is-open { transform: translateX(0); }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s var(--ease);
    z-index: 140;
  }
  .nav-scrim.is-open { opacity: 1; pointer-events: auto; }

  main, .site-footer { margin-left: 0; }

  .projects-grid, .education-grid { grid-template-columns: 1fr; }
  .project-featured { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .section { padding: 5rem 6vw; }
  .hero { padding: 6rem 6vw 5rem; min-height: auto; }
  .footer-inner { justify-content: center; text-align: center; }
}