/* Raghubabu portfolio — modern DevOps aesthetic */
:root {
  --bg-deep: #05060a;
  --bg-elevated: #0c0e14;
  --surface: rgba(18, 22, 32, 0.65);
  --border: rgba(120, 160, 255, 0.12);
  --text: #e8ecf4;
  --text-muted: #8b95a8;
  --accent: #3dffce;
  --accent-2: #6b8cff;
  --accent-warm: #ff6b9d;
  --gradient-hero: linear-gradient(135deg, #0a1628 0%, #05060a 45%, #0a0f1a 100%);
  --font-display: "Sora", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --radius: 18px;
  --radius-sm: 10px;
  --shadow-glow: 0 0 80px rgba(61, 255, 206, 0.08);
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: transparent;
  overflow-x: hidden;
}

/* Deep night sky — stars + meteor showers (site-wide fixed canvas) */
.sky-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background:
    radial-gradient(ellipse 120% 80% at 50% -10%, #1a2744 0%, transparent 55%),
    radial-gradient(ellipse 90% 60% at 80% 100%, #0d1528 0%, transparent 50%),
    linear-gradient(180deg, #02040a 0%, #050b18 40%, #02060f 100%);
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

main,
.site-header,
.project-page {
  position: relative;
  z-index: 1;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: #7dffeb;
}

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

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem min(5vw, 2.5rem);
  height: var(--header-h);
  background: linear-gradient(to bottom, rgba(5, 6, 10, 0.92), rgba(5, 6, 10, 0.65) 70%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
  background: rgba(5, 6, 10, 0.88);
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

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

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

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

.nav-cta {
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--accent), #2ae8c0);
  color: #04120e !important;
  font-weight: 600 !important;
}

.nav-cta:hover {
  filter: brightness(1.08);
  color: #021008 !important;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 7px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease;
}

@media (max-width: 860px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1.25rem min(5vw, 2rem) 1.5rem;
    background: rgba(8, 10, 16, 0.97);
    border-bottom: 1px solid var(--border);
    gap: 0;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.25s ease;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-cta {
    margin-top: 0.75rem;
    text-align: center;
    border: none;
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 2rem) 0 4rem;
  background: transparent;
}

.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(107, 140, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(107, 140, 255, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, black 20%, transparent 75%);
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.28;
  pointer-events: none;
}

.hero-glow-1 {
  width: min(55vw, 480px);
  height: min(55vw, 480px);
  top: 10%;
  right: -10%;
  background: var(--accent-2);
}

.hero-glow-2 {
  width: min(45vw, 380px);
  height: min(45vw, 380px);
  bottom: 15%;
  left: -5%;
  background: var(--accent);
  opacity: 0.25;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.25rem;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.75rem, 8vw, 5.25rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 0 0 1.5rem;
}

.hero-title .line {
  display: block;
}

.hero-title .accent {
  background: linear-gradient(105deg, var(--text) 0%, var(--accent) 45%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 34rem;
  color: var(--text-muted);
  font-size: 1.125rem;
  margin: 0 0 2rem;
}

.hero-lead strong {
  color: var(--text);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), #22d4b0);
  color: #031510;
  box-shadow: 0 0 0 1px rgba(61, 255, 206, 0.3), var(--shadow-glow);
}

.btn-primary:hover {
  box-shadow: 0 0 40px rgba(61, 255, 206, 0.25);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: rgba(61, 255, 206, 0.35);
  background: rgba(61, 255, 206, 0.06);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-meta li {
  position: relative;
  padding-left: 1rem;
}

.hero-meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%,
  100% {
    opacity: 0.4;
    transform: scaleY(0.85);
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

@media (max-width: 600px) {
  .hero-scroll {
    display: none;
  }
}

/* Sections */
.section {
  padding: clamp(4rem, 10vw, 6.5rem) 0;
  position: relative;
}

.section-head {
  margin-bottom: 2.75rem;
  max-width: 40rem;
}

.section-head-center {
  text-align: center;
  margin-inline: auto;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-warm);
  margin-bottom: 0.75rem;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0;
  line-height: 1.15;
}

.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(16px);
}

/* About */
.about {
  background: linear-gradient(180deg, rgba(5, 6, 10, 0.55) 0%, rgba(12, 14, 20, 0.72) 50%, rgba(5, 6, 10, 0.55) 100%);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

.about-card,
.skills-panel {
  padding: clamp(1.5rem, 4vw, 2.25rem);
}

.about-card h3,
.skills-panel h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0 0 1rem;
  color: var(--accent);
}

.about-card p {
  margin: 0;
  color: var(--text-muted);
}

.about-card strong {
  color: var(--text);
}

.skill-groups {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.skill-group-title {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.tags {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.5;
}

/* Impact stats */
.impact {
  border-block: 1px solid var(--border);
}

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

@media (max-width: 960px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }
}

.stat-card {
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(61, 255, 206, 0.06) 0%, rgba(18, 22, 32, 0.8) 100%);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(107, 140, 255, 0.15), transparent 70%);
  pointer-events: none;
}

.stat-value {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1;
}

.stat-unit {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  margin-left: 0.15rem;
}

.stat-desc {
  margin: 1rem 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Timeline */
.experience {
  background: rgba(12, 14, 20, 0.55);
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-2), transparent);
  border-radius: 2px;
  opacity: 0.5;
}

@media (min-width: 768px) {
  .timeline::before {
    left: 19px;
  }
}

.timeline-item {
  position: relative;
  padding-left: 3rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .timeline-item {
    padding-left: 3.5rem;
  }
}

.timeline-marker {
  position: absolute;
  left: 4px;
  top: 1.25rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 3px solid var(--accent);
  box-shadow: 0 0 20px rgba(61, 255, 206, 0.35);
  z-index: 1;
}

@media (min-width: 768px) {
  .timeline-marker {
    left: 12px;
  }
}

.timeline-card {
  padding: clamp(1.35rem, 3vw, 2rem);
}

.timeline-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 0.35rem;
}

.timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0;
  font-weight: 700;
}

.badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  vertical-align: middle;
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
  background: rgba(61, 255, 206, 0.15);
  color: var(--accent);
  margin-left: 0.35rem;
}

.badge-soft {
  background: rgba(107, 140, 255, 0.2);
  color: #a8bcff;
}

.timeline-org {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.timeline-date {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-warm);
  margin-bottom: 1rem;
}

.timeline-bullets {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.timeline-bullets li {
  margin-bottom: 0.5rem;
}

.timeline-bullets li:last-child {
  margin-bottom: 0;
}

.timeline-tech {
  margin: 1.15rem 0 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* Projects */
.projects {
  background: linear-gradient(180deg, rgba(5, 6, 10, 0.5), rgba(8, 10, 16, 0.65));
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

@media (max-width: 800px) {
  .project-grid {
    grid-template-columns: 1fr;
  }
}

.project-card {
  padding: clamp(1.35rem, 3vw, 1.85rem);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.project-card:hover {
  border-color: rgba(61, 255, 206, 0.25);
  transform: translateY(-3px);
}

.project-card-top {
  margin-bottom: 0.75rem;
}

.project-tag {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0.35rem 0 0;
}

.project-card > p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0 0 1rem;
}

.project-card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.project-card li {
  margin-bottom: 0.4rem;
}

.project-card-actions {
  margin-top: 1rem;
}

.project-card-actions .btn {
  width: 100%;
}

.projects-hub-cta {
  margin-top: 1.5rem;
}

/* Education */
.education .edu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  max-width: 1100px;
  margin-inline: auto;
}

@media (max-width: 900px) {
  .education .edu-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .education .edu-grid {
    grid-template-columns: 1fr;
  }
}

.edu-card {
  padding: 1.5rem 1.75rem;
  text-align: center;
}

.edu-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.edu-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.practices {
  text-align: center;
  max-width: 560px;
  margin: 2.5rem auto 0;
  color: var(--text-muted);
}

.practices strong {
  color: var(--text);
}

/* Contact */
.contact {
  padding-bottom: 5rem;
}

.contact-inner {
  padding: clamp(2.5rem, 6vw, 4rem);
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  border: 1px solid rgba(61, 255, 206, 0.2);
  box-shadow: 0 0 100px rgba(61, 255, 206, 0.06);
}

.contact-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  margin: 0 0 0.75rem;
}

.contact-inner > p:first-of-type {
  color: var(--text-muted);
  margin: 0 0 2rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.contact-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  background: rgba(61, 255, 206, 0.1);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid rgba(61, 255, 206, 0.25);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-chip:hover {
  background: rgba(61, 255, 206, 0.18);
  color: #b8fff0;
  border-color: rgba(61, 255, 206, 0.45);
}

.contact-chip:active {
  background: rgba(61, 255, 206, 0.22);
  color: #e6fffa;
}

.contact-chip:focus {
  outline: none;
}

.contact-chip:focus-visible {
  color: #b8fff0;
  background: rgba(61, 255, 206, 0.18);
  border-color: rgba(61, 255, 206, 0.55);
  box-shadow: 0 0 0 3px rgba(61, 255, 206, 0.35);
}

/* Featured project accent — same card layout as peers */
.project-card-featured {
  border-color: rgba(61, 255, 206, 0.28);
  box-shadow: 0 0 36px rgba(61, 255, 206, 0.06);
}

.project-card-featured .project-tag-personal {
  background: rgba(61, 255, 206, 0.14);
  color: var(--accent);
}

.project-tag-personal {
  color: var(--accent);
}

.project-card-cta {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.project-card-cta .btn {
  white-space: nowrap;
}

/* Passion / IoT strip */
.passion {
  background: linear-gradient(180deg, rgba(8, 10, 16, 0.55), rgba(12, 14, 20, 0.7));
  border-block: 1px solid var(--border);
}

.passion-intro {
  max-width: 42rem;
  margin: 0 auto 2.5rem;
  text-align: center;
  color: var(--text-muted);
}

.passion-intro strong {
  color: var(--text);
}

.passion-layout {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 1.5rem;
  align-items: stretch;
}

@media (max-width: 900px) {
  .passion-layout {
    grid-template-columns: 1fr;
  }
}

.passion-visual.glass {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}

.passion-diagram {
  width: 100%;
  max-width: 340px;
  height: auto;
}

.passion-tags.glass {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.passion-tags h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 1rem;
  color: var(--accent);
}

.passion-chip-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.passion-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text);
  background: rgba(107, 140, 255, 0.1);
  border: 1px solid rgba(107, 140, 255, 0.2);
}

.passion-chip svg {
  flex-shrink: 0;
  opacity: 0.9;
}

/* Project detail page */
.project-page {
  padding-top: var(--header-h);
}

.sub-hero {
  padding: calc(var(--header-h) + 2rem) 0 3rem;
  background: linear-gradient(165deg, rgba(10, 20, 34, 0.45) 0%, rgba(5, 6, 10, 0.55) 55%);
  border-bottom: 1px solid var(--border);
}

.sub-hero-title {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0 0 1.25rem;
  max-width: 20ch;
}

.sub-hero-lead {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 40rem;
  margin: 0 0 1.5rem;
}

.sub-hero-lead strong {
  color: var(--text);
}

.sub-hero-meta {
  margin: 0;
}

.text-link {
  font-weight: 600;
  font-size: 0.95rem;
}

.narrow {
  max-width: 720px;
  margin-inline: auto;
}

.prose-heading {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0 0 1rem;
}

.prose {
  padding: clamp(1.35rem, 3vw, 2rem);
  color: var(--text-muted);
}

.prose p {
  margin: 0 0 1rem;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  color: var(--text);
}

.pull-quote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.35rem;
  border-left: 4px solid var(--accent-warm);
  background: rgba(255, 107, 157, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text);
}

.section-sub {
  margin: 0.5rem 0 0;
  max-width: 36rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.section-head-center .section-sub {
  margin-inline: auto;
}

.inline-code {
  font-family: ui-monospace, monospace;
  font-size: 0.85em;
  color: var(--accent);
  background: rgba(61, 255, 206, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 6px;
}

.arch-wrap {
  padding: clamp(1rem, 3vw, 2rem);
  overflow-x: auto;
}

.arch-svg {
  display: block;
  width: min(920px, 100%);
  height: auto;
  margin-inline: auto;
}

/* Hardware photo grid */
.hw-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.hw-grid-single {
  grid-template-columns: min(560px, 100%);
  margin-bottom: 1.75rem;
}

@media (max-width: 900px) {
  .hw-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .hw-grid {
    grid-template-columns: 1fr;
  }
}

.hw-photo-card {
  margin: 0;
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hw-photo-frame {
  position: relative;
  aspect-ratio: 4 / 3;
  background: linear-gradient(145deg, rgba(107, 140, 255, 0.08), rgba(18, 22, 32, 0.9));
  border-bottom: 1px solid var(--border);
}

.hw-photo-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
  z-index: 1;
}

.hw-photo-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 2;
}

.esp32-video-card {
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.esp32-video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(145deg, rgba(61, 255, 206, 0.08), rgba(18, 22, 32, 0.92));
  border-bottom: 1px solid var(--border);
}

.esp32-video-frame video {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  background: #05060a;
}

.esp32-video-card figcaption {
  padding: 0.85rem 1rem 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hw-photo-card figcaption {
  padding: 0.85rem 1rem 1.1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
}

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

@media (max-width: 800px) {
  .hw-spec-grid {
    grid-template-columns: 1fr;
  }
}

.hw-spec {
  padding: 1.25rem 1.35rem;
}

.hw-spec h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  margin: 0 0 0.75rem;
  color: var(--accent-2);
}

.hw-spec ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hw-spec li {
  margin-bottom: 0.35rem;
}

.tag-cloud {
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}

.hash-tag {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-2);
  opacity: 0.95;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.08s;
}

.reveal-delay-2 {
  transition-delay: 0.16s;
}

.reveal-delay-3 {
  transition-delay: 0.24s;
}

.reveal-delay-4 {
  transition-delay: 0.32s;
}

.hero .reveal {
  opacity: 1;
  transform: none;
  animation: heroIn 0.9s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

.hero .reveal-delay-1 {
  animation-delay: 0.1s;
}

.hero .reveal-delay-2 {
  animation-delay: 0.2s;
}

.hero .reveal-delay-3 {
  animation-delay: 0.3s;
}

.hero .reveal-delay-4 {
  animation-delay: 0.4s;
}

@keyframes heroIn {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

  .sky-canvas {
    opacity: 0.85;
  }

  .hero-scroll-line {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero .reveal {
    animation: none;
  }
}

/* —— Portfolio upgrade: badges, social, exp, arch, certs, insights —— */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 10000;
  padding: 0.65rem 1.1rem;
  background: var(--accent);
  color: #031510;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1.35rem;
  max-width: 40rem;
}

.hero-badges li {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.hero-social {
  display: flex;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
}

.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.social-icon:hover,
.social-icon:focus-visible {
  color: var(--accent);
  border-color: rgba(61, 255, 206, 0.4);
  background: rgba(61, 255, 206, 0.08);
  outline: none;
}

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

.exp-block {
  margin: 0.75rem 0 0.5rem;
}

.exp-block p {
  margin: 0 0 0.65rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

.exp-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 0.45rem;
}

.project-meta-list {
  margin: 0 0 1rem;
}

.project-meta-list > div {
  margin-bottom: 0.55rem;
}

.project-meta-list dt {
  display: inline;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 0.35rem;
}

.project-meta-list dd {
  display: inline;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.project-card-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.project-card-actions-row .btn {
  width: auto;
  flex: 1 1 auto;
  min-width: 7rem;
}

.project-card {
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.project-card:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(61, 255, 206, 0.12);
}

.architectures,
.certifications,
.insights {
  position: relative;
}

.arch-grid,
.cert-grid,
.insight-grid {
  display: grid;
  gap: 1rem;
}

.arch-grid {
  grid-template-columns: repeat(4, 1fr);
}

.cert-grid,
.insight-grid {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 960px) {
  .arch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .cert-grid,
  .insight-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .arch-grid {
    grid-template-columns: 1fr;
  }
}

.arch-card,
.cert-card,
.insight-card {
  padding: 1.25rem 1.35rem;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.arch-card:hover,
.cert-card:hover,
.insight-card:hover {
  border-color: rgba(61, 255, 206, 0.28);
  transform: translateY(-2px);
}

.arch-card h3,
.cert-card h3,
.insight-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 0.45rem;
}

.arch-card p,
.cert-card p,
.insight-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.cert-status,
.insight-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

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