/* ==========================================================================
   Faria Akter Preeti — Portfolio Stylesheet
   Palette: bg #0a0e17 / surface glass / accent cyan #00d4ff / warm #ffb454
   Type: Space Grotesk (display) · Inter (body) · JetBrains Mono (eyebrows/tags)
   ========================================================================== */

:root {
  --bg: #090d14;
  --bg-alt: #0d1320;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-border: rgba(0, 212, 255, 0.16);
  --accent: #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.35);
  --warm: #ffb454;
  --text: #e8edf4;
  --text-muted: #8b98a9;
  --text-faint: #5c6779;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 16px;
  --transition: 0.35s cubic-bezier(.4,0,.2,1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 900px 500px at 15% -5%, rgba(0,212,255,0.10), transparent 60%),
    radial-gradient(ellipse 700px 500px at 90% 15%, rgba(255,180,84,0.06), transparent 60%),
    radial-gradient(ellipse 900px 600px at 50% 100%, rgba(0,212,255,0.07), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

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

::selection { background: var(--accent-dim); color: #fff; }

/* Focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Typography helpers ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.03em;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 600;
  max-width: 680px;
  margin-bottom: 14px;
  line-height: 1.25;
}

.section-sub {
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 48px;
  font-size: 1rem;
}

.text-accent { color: var(--accent); }

section { position: relative; z-index: 1; padding: 110px 0; }

/* ---------- Glassmorphism ---------- */
.glass {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.btn--primary {
  background: var(--accent);
  color: #051018;
  box-shadow: 0 0 0 rgba(0,212,255,0);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px -8px rgba(0,212,255,0.55);
}
.btn--ghost {
  background: transparent;
  border-color: rgba(255,255,255,0.16);
  color: var(--text);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn--icon {
  padding: 12px;
  border-radius: 50%;
  background: transparent;
  border-color: rgba(255,255,255,0.16);
}
.btn--icon:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn--small { padding: 9px 18px; font-size: 0.82rem; }
.btn--full { width: 100%; justify-content: center; margin-top: 6px; }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: background var(--transition), padding var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  padding: 12px 0;
  background: rgba(9, 13, 20, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0,212,255,0.12);
}
.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.navbar__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.navbar__logo-bracket { color: var(--accent); }
.navbar__links {
  display: flex;
  align-items: center;
  gap: 34px;
}
.nav-link {
  font-size: 0.92rem;
  color: var(--text-muted);
  position: relative;
  transition: color var(--transition);
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav-link:hover, .nav-link.active-link { color: var(--text); }
.nav-link:hover::after, .nav-link.active-link::after { width: 100%; }
.navbar__cv { margin-left: 6px; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 110;
}
.hamburger span {
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition), background var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); background: var(--accent); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); background: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 100px;
  overflow: hidden;
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 20%, transparent 75%);
}
.hero__circuit {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  opacity: 0.55;
  z-index: 0;
}
.circuit-lines path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.5;
  opacity: 0.28;
  stroke-dasharray: 8 6;
  animation: dash 6s linear infinite;
}
.circuit-nodes circle {
  fill: var(--accent);
  animation: pulse-node 2.6s ease-in-out infinite;
}
.circuit-nodes circle:nth-child(odd) { animation-delay: 0.6s; }
@keyframes dash { to { stroke-dashoffset: -140; } }
@keyframes pulse-node {
  0%, 100% { opacity: 0.4; r: 4; }
  50% { opacity: 1; r: 6; }
}

.hero__inner { max-width: 760px; }
.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.4vw, 3.6rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 14px;
}
.hero__typewriter {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  color: var(--warm);
  min-height: 1.6em;
  margin-bottom: 22px;
  font-weight: 500;
}
.cursor-blink { animation: blink 0.9s steps(1) infinite; color: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }

.hero__desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: 34px;
}
.hero__actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }

.scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.scroll-indicator span {
  width: 4px; height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: scroll-dot 1.6s ease-in-out infinite;
}
@keyframes scroll-dot {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(12px); opacity: 0; }
  100% { opacity: 0; }
}

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 60px;
  align-items: start;
}
.about__photo-wrap { position: relative; }
.about__photo {
  padding: 10px;
  overflow: hidden;
}
.about__photo img {
  border-radius: 10px;
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  filter: saturate(1.05);
}
.about__badge {
  position: absolute;
  bottom: -18px; right: -14px;
  background: var(--bg-alt);
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
.about__badge-num { font-family: var(--font-display); color: var(--accent); font-weight: 700; font-size: 1.1rem; }
.about__badge-label { font-size: 0.72rem; color: var(--text-muted); }

.about__text { color: var(--text-muted); margin-bottom: 16px; }
.about__text strong { color: var(--text); font-weight: 600; }

.about__facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 30px 0 40px;
}
.fact {
  padding: 18px;
  text-align: center;
}
.fact__value {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent);
  font-weight: 700;
}
.fact__label { font-size: 0.75rem; color: var(--text-muted); }

.skills__heading {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 20px;
  font-weight: 600;
}
.skillbar { margin-bottom: 18px; }
.skillbar__top {
  display: flex;
  justify-content: space-between;
  font-size: 0.86rem;
  margin-bottom: 8px;
  color: var(--text-muted);
}
.skillbar__pct { color: var(--accent); font-family: var(--font-mono); }
.skillbar__track {
  height: 8px;
  background: rgba(255,255,255,0.06);
  border-radius: 10px;
  overflow: hidden;
}
.skillbar__fill {
  height: 100%;
  width: 0;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--accent), var(--warm));
  transition: width 1.4s cubic-bezier(.16,1,.3,1);
}

/* ---------- Services ---------- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  padding: 30px 26px;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-dim);
  background: rgba(255,255,255,0.06);
}
.service-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--warm);
  background: rgba(255,180,84,0.08);
  border: 1px solid rgba(255,180,84,0.25);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 18px;
}
.service-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 10px;
  font-weight: 600;
}
.service-card p { color: var(--text-muted); font-size: 0.94rem; }

/* ---------- Testimonials ---------- */
.testimonial-slider { position: relative; max-width: 700px; margin: 0 auto; }
.testimonial-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(.65,0,.35,1);
}
.testimonial {
  min-width: 100%;
  padding: 40px;
  text-align: center;
}
.testimonial__quote {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text);
  margin-bottom: 26px;
  line-height: 1.6;
}
.testimonial__author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.testimonial__author img {
  width: 48px; height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-dim);
}
.testimonial__author div { text-align: left; }
.testimonial__author strong { display: block; font-size: 0.94rem; }
.testimonial__author span { font-size: 0.8rem; color: var(--text-muted); }

.testimonial-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
}
.testimonial-dots button {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: rgba(255,255,255,0.18);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.testimonial-dots button.active {
  background: var(--accent);
  transform: scale(1.3);
}

/* ---------- CTA ---------- */
.cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 50px 50px;
  flex-wrap: wrap;
}
.cta__inner h2 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  margin-bottom: 8px;
}
.cta__inner p { color: var(--text-muted); max-width: 420px; }

/* ---------- Contact ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 40px;
}
.contact__info { display: flex; flex-direction: column; gap: 14px; }
.contact__item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  font-size: 0.92rem;
  color: var(--text-muted);
}
.contact__item svg { color: var(--accent); flex-shrink: 0; }
.contact__item a:hover { color: var(--accent); }

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.85rem; color: var(--text-muted); }
.form-group input, .form-group textarea {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 13px 16px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent);
  outline: none;
}
.form-group.error input, .form-group.error textarea { border-color: #ff5c7a; }
.form-error {
  font-size: 0.78rem;
  color: #ff5c7a;
  min-height: 14px;
}
.form-success {
  display: none;
  color: var(--accent);
  font-size: 0.9rem;
  text-align: center;
  margin-top: 4px;
}
.form-success.show { display: block; }

/* ---------- Footer ---------- */
.footer {
  padding: 50px 0 30px;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
}
.footer__inner { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.footer__tagline { color: var(--text-muted); font-size: 0.88rem; }
.footer__socials { display: flex; gap: 16px; }
.footer__socials a {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition), transform var(--transition);
}
.footer__socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-3px); }
.footer__copy { font-size: 0.78rem; color: var(--text-faint); margin-top: 6px; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--accent);
  color: #051018;
  border: none;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 90;
  box-shadow: 0 8px 24px rgba(0,212,255,0.3);
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- Cursor glow (desktop only, decorative) ---------- */
.cursor-glow {
  position: fixed;
  width: 380px; height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,212,255,0.06), transparent 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 0;
  transition: opacity 0.3s;
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .about__grid, .contact__grid { grid-template-columns: 1fr; }
  .about__photo-wrap { max-width: 280px; margin: 0 auto 50px; }
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .cursor-glow { display: none; }
}

@media (max-width: 720px) {
  .navbar__links {
    position: fixed;
    top: 0; right: -100%;
    height: 100vh;
    width: min(78vw, 320px);
    background: rgba(9,13,20,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 30px;
    transition: right var(--transition);
    border-left: 1px solid var(--surface-border);
  }
  .navbar__links.open { right: 0; }
  .hamburger { display: flex; }
  .services__grid { grid-template-columns: 1fr; }
  .about__facts { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .fact { padding: 12px 6px; }
  .fact__value { font-size: 1.15rem; }
  .cta__inner { flex-direction: column; text-align: center; padding: 40px 26px; }
  section { padding: 80px 0; }
  .hero { padding-top: 120px; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn--icon { align-self: center; }
  .testimonial { padding: 26px 20px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}