:root {
  --bg: #0b0f14;
  --bg-end: #071018;
  --panel: #0f1720;
  --muted: #99a0a6;
  --text: #e6eef7;
  --accent: #4de0ff;
  --accent-2: #7b61ff;
  --glass: rgba(255, 255, 255, 0.03);
  --border: rgba(255, 255, 255, 0.05);
  --radius: 12px;
  --fw-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  --fw-mono: 'SF Mono', 'Fira Code', 'Roboto Mono', monospace;
}

:root.light {
  --bg: #f8fafc;
  --bg-end: #ffffff;
  --panel: rgba(255, 255, 255, 0.65);
  --muted: #64748b;
  --text: #0f172a;
  --accent: #2563eb;
  --accent-2: #0891b2;
  --glass: rgba(255, 255, 255, 0.4);
  --border: rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box
}

html,
body {
  height: 100%
}

body {
  margin: 0;
  background: linear-gradient(180deg, var(--bg), var(--bg-end));
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--fw-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  line-height: 1.45;

  /* Tech grid pattern */
  background-image:
    linear-gradient(180deg, var(--bg) 0%, var(--bg-end) 100%),
    radial-gradient(var(--muted) 0.5px, transparent 0.5px);
  background-size: 100% 100%, 24px 24px;
  background-blend-mode: normal, overlay;
}

:root.light body {
  background-blend-mode: normal, multiply;
  /* Better visibility in light mode */
}

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1rem;
  backdrop-filter: blur(6px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
  border-bottom: 1px solid rgba(255, 255, 255, 0.02);
}

.brand a {
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.6px;
  text-decoration: none;
}

.brand .dot {
  color: var(--accent);
  margin-left: 4px;
}

.nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 8px;
  font-weight: 500;
}

.nav a:hover {
  color: var(--text);
  background: var(--glass);
}

.nav-close-btn {
  display: none;
}

.controls {
  display: flex;
  gap: .6rem;
  align-items: center;
}

#theme-toggle {
  width: 40px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

#theme-toggle:hover,
#theme-toggle:focus-visible {
  transform: translateY(-1px);
  border-color: color-mix(in oklab, var(--accent) 45%, transparent);
  box-shadow: 0 8px 20px color-mix(in oklab, var(--accent) 24%, transparent);
  outline: none;
}

.theme-icon {
  width: 19px;
  height: 19px;
  display: block;
}

.theme-icon-sun {
  display: none;
}

:root.light .theme-icon-sun {
  display: block;
}

:root.light .theme-icon-moon {
  display: none;
}

.hamburger {
  display: none;
  width: 40px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.hamburger span {
  display: block;
  height: 2px;
  width: 20px;
  background: var(--text);
  margin: 4px 0;
  border-radius: 2px
}

/* Sections */
.section {
  padding: 60px 18px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

/* HERO */
.hero .hero-content {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 2rem;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 32px;
}

.name {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text);
}

.role {
  color: var(--accent);
  margin-top: 6px;
  font-weight: 600
}

.typewriter {
  margin-top: 14px;
  font-weight: 500;
  color: var(--muted);
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.cursor {
  color: var(--accent);
  font-weight: 900;
  animation: blink 1s steps(2, end) infinite;
}

@keyframes blink {
  50% {
    opacity: 0
  }
}

.hero-actions {
  margin-top: 18px;
  display: flex;
  gap: 12px;
}

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--panel);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  font-weight: 700;
}

.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.06)
}

/* device card */
.device-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
  position: relative;
  overflow: hidden;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.device-card .board-glow {
  position: absolute;
  inset: -30% -20%;
  background: radial-gradient(circle at 20% 20%, rgba(77, 224, 255, 0.12), transparent 10%), radial-gradient(circle at 80% 80%, rgba(123, 97, 255, 0.08), transparent 10%);
  transform: rotate(12deg);
}

.circuit {
  width: 100%;
  height: 100%;
  opacity: 0.95;
  mix-blend-mode: screen;
  pointer-events: none;
}

.minibot-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.device-caption {
  position: absolute;
  bottom: 10px;
  right: 14px;
  font-size: 0.78rem;
  color: var(--muted)
}

/* about */
.about .about-grid {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 1.6rem;
  align-items: start;
}

.about ul {
  margin-top: 8px;
  color: var(--muted)
}

/* projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.project-card {
  background: var(--panel);
  backdrop-filter: blur(12px);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  transition: transform .22s ease, box-shadow .22s ease;
  border: 1px solid var(--border);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.7);
}

.pc-media {
  height: 160px;
  background-size: cover;
  background-position: center;
}

.pc-body {
  padding: 14px;
}

.pc-body h3 {
  margin: 0 0 8px 0;
}

.pc-tags {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--muted);
  font-family: var(--fw-mono);
}

.pc-tags span {
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 6px 8px;
  border-radius: 8px;
}

/* skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

/* contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.contact-icons {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(150px, 1fr));
  gap: 12px;
}

.contact-icon {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  background: linear-gradient(150deg, var(--glass), transparent);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  min-height: 52px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-icon svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--accent);
}

.contact-icon span {
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.contact-icon:hover,
.contact-icon:focus-visible {
  transform: translateY(-3px);
  border-color: color-mix(in oklab, var(--accent) 45%, transparent);
  box-shadow: 0 10px 24px color-mix(in oklab, var(--accent) 24%, transparent);
  outline: none;
}

.contact-icon.location svg {
  color: var(--accent-2);
}

.contact-icon.whatsapp svg {
  color: #25d366;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--panel);
  padding: 14px;
  border-radius: 12px;
}

.contact-form label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  color: var(--muted);
}

.contact-form input,
.contact-form textarea {
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--accent) 22%, transparent);
}

:root.light .contact-form input,
:root.light .contact-form textarea {
  border-color: rgba(15, 23, 42, 0.22);
  background: rgba(255, 255, 255, 0.75);
}

:root.light .contact-form input::placeholder,
:root.light .contact-form textarea::placeholder {
  color: rgba(51, 65, 85, 0.8);
}

.form-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 6px;
}

#form-status {
  color: var(--accent);
  font-weight: 600;
}

/* footer */
.footer {
  padding: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.02);
  color: var(--muted);
}

/* Responsiveness */
@media (max-width:980px) {
  .hero .hero-content {
    grid-template-columns: 1fr;
  }

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

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

  .contact-icons {
    grid-template-columns: 1fr;
  }

  /* Nav becomes a full-screen overlay */
  .nav {
    display: flex;
    position: fixed;
    inset: 0;
    z-index: 100;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(11, 15, 20, 0.95);
    backdrop-filter: blur(12px);
    gap: 2rem;
    transform: translateY(-100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), visibility 0s 0.4s;
    visibility: hidden;
    pointer-events: none;
  }

  /* When active (added via JS) */
  .nav.active {
    transform: translateY(0);
    visibility: visible;
    pointer-events: auto;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), visibility 0s;
  }

  .nav a {
    font-size: 1.5rem;
    color: var(--text);
    width: 100%;
    text-align: center;
    padding: 1rem;
  }

  .nav a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent);
  }

  /* Hamburger visible on mobile */
  .hamburger {
    display: block;
    z-index: 101;
    /* Ensure above other elements if needed, though nav is z-100 */
    transition: opacity 0.2s ease;
  }

  .hamburger[aria-expanded="true"] {
    opacity: 0;
    pointer-events: none;
  }

  /* Close button inside nav */
  .nav-close-btn {
    display: block;
    position: absolute;
    top: 24px;
    right: 24px;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 2.5rem;
    cursor: pointer;
    line-height: 1;
  }

  /* Content blur effect */
  body.menu-open main,
  body.menu-open .footer {
    filter: blur(8px);
    transition: filter 0.4s ease;
  }

  main,
  .footer {
    transition: filter 0.4s ease;
  }
}

/* Back to Top Button */
#back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  z-index: 90;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  background: var(--accent);
  color: var(--bg);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(77, 224, 255, 0.25);
}

#back-to-top svg {
  width: 20px;
  height: 20px;
}