/* =========================================================
   UTKARSH KESHARI — PORTFOLIO
   Theme: "System Console" — dev-editor framing, black/cyan
   ========================================================= */

:root {
  /* Color tokens */
  --bg: #050816;
  --bg-panel: #0a1024;
  --bg-panel-2: #0d1430;
  --primary: #00d9ff;
  --primary-dim: #00a8c9;
  --secondary: #4f46e5;
  --accent-warm: #ffb454;
  --text: #eaf2ff;
  --muted: #8694b5;
  --muted-dim: #586280;
  --border: rgba(255, 255, 255, 0.09);
  --border-bright: rgba(0, 217, 255, 0.35);
  --glass: rgba(255, 255, 255, 0.035);
  --glass-bright: rgba(255, 255, 255, 0.06);
  --danger-glow: rgba(0, 217, 255, 0.18);

  /* Type */
  --font-display: "Sora", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  /* Layout */
  --max-w: 1180px;
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(0.22, 1, 0.36, 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);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Ambient grid + glow background, fixed behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

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

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

/* ---------- Focus visibility (a11y) ---------- */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Eyebrow / code-comment label (signature device) ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--primary);
  opacity: 0.85;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before { content: "//"; color: var(--muted-dim); }

.section-heading {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  max-width: 680px;
}

.section-sub {
  color: var(--muted);
  max-width: 560px;
  font-size: 16px;
  margin-bottom: 48px;
}

section { position: relative; z-index: 1; padding: 120px 0; }
@media (max-width: 720px) { section { padding: 80px 0; } }

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

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--font-mono);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: transform 0.25s var(--ease), border-color 0.25s, background 0.25s, box-shadow 0.25s;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #04101a;
  font-weight: 600;
  border: none;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -8px var(--danger-glow); }
.btn-ghost { color: var(--text); background: var(--glass); }
.btn-ghost:hover { border-color: var(--border-bright); transform: translateY(-2px); }
.btn-ghost::before { content: "$"; color: var(--primary); }

/* ---------- NAV (editor tab bar) ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(5, 8, 22, 0.55);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background 0.3s, border-color 0.3s;
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-logo .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 10px var(--primary); }

.nav-tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}
.nav-tabs a {
  padding: 8px 14px;
  border-radius: 6px 6px 0 0;
  border: 1px solid transparent;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}
.nav-tabs a:hover { color: var(--text); background: var(--glass); }
.nav-tabs a.active { color: var(--primary); background: var(--bg-panel); border-color: var(--border); border-bottom-color: var(--bg-panel); }

.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-cta .btn { padding: 9px 16px; font-size: 13px; }

.nav-burger {
  display: none;
  width: 36px; height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--glass);
  position: relative;
}
.nav-burger span {
  position: absolute; left: 8px; right: 8px; height: 1.5px; background: var(--text);
  transition: transform 0.25s, opacity 0.25s;
}
.nav-burger span:nth-child(1) { top: 13px; }
.nav-burger span:nth-child(2) { top: 18px; }
.nav-burger span:nth-child(3) { top: 23px; }
.nav-burger.open span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

@media (max-width: 880px) {
  .nav-tabs { display: none; }
  .nav-burger { display: block; }
  .nav-cta .btn-ghost { display: none; }
}

.mobile-menu {
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  z-index: 49;
  font-family: var(--font-mono);
  font-size: 14px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease);
}
.mobile-menu.open { max-height: 420px; }
.mobile-menu a { display: block; padding: 16px 28px; border-bottom: 1px solid var(--border); color: var(--muted); }
.mobile-menu a:hover { color: var(--primary); }

/* ---------- HERO ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 110px;
  padding-bottom: 60px;
  position: relative;
}
#bg-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  width: 100%;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero { padding-top: 100px; }
}

.terminal {
  font-family: var(--font-mono);
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--muted-dim);
  font-size: 13px;
}
.terminal-bar .tdot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted-dim); opacity: 0.5; }

.terminal-line { color: var(--muted); font-size: 14px; margin-bottom: 6px; }
.terminal-line .prompt { color: var(--primary); }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 10px 0 14px;
  background: linear-gradient(135deg, #ffffff 40%, var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text);
  margin-bottom: 22px;
}
.hero-role .sep { color: var(--muted-dim); margin: 0 8px; }

.hero-typing {
  font-family: var(--font-mono);
  font-size: 16px;
  min-height: 26px;
  color: var(--primary);
  margin-bottom: 34px;
  display: flex;
  align-items: center;
}
.hero-typing .cursor {
  display: inline-block;
  width: 9px;
  height: 18px;
  background: var(--primary);
  margin-left: 4px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero photo — glass tilt card */
.photo-stage {
  position: relative;
  display: flex;
  justify-content: center;
  perspective: 1200px;
}
.tilt-card {
  position: relative;
  width: min(360px, 80vw);
  aspect-ratio: 3/4;
  border-radius: 20px;
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out;
  will-change: transform;
}
.tilt-card .glow-ring {
  position: absolute;
  inset: -30px;
  border-radius: 30px;
  background: radial-gradient(circle at 50% 30%, rgba(0,217,255,0.25), transparent 65%);
  transform: translateZ(-60px);
  filter: blur(6px);
  pointer-events: none;
}
.tilt-card .frame {
  position: absolute;
  inset: 0;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border-bright);
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.6), 0 0 0 1px rgba(0,217,255,0.08) inset;
  transform: translateZ(20px);
}
.tilt-card .frame img {
  width: 100%; height: 100%; object-fit: cover;
  filter: saturate(1.05) contrast(1.05);
}
.tilt-card .frame::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(5,8,22,0.85) 100%);
}
.tilt-card .badge-chip {
  position: absolute;
  bottom: 18px; left: 18px; right: 18px;
  transform: translateZ(50px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
}
.tilt-card .badge-chip .live {
  display: flex; align-items: center; gap: 6px; color: var(--primary);
}
.tilt-card .badge-chip .live .pulse-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot { 0%,100%{opacity:1;} 50%{opacity:0.3;} }
.tilt-card .float-tag {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 6px 10px;
  border-radius: 7px;
  background: rgba(10, 16, 36, 0.85);
  border: 1px solid var(--border-bright);
  color: var(--primary);
  transform: translateZ(70px);
  animation: float-tag 6s ease-in-out infinite;
}
.float-tag.t1 { top: 8%; right: -8%; animation-delay: 0s; }
.float-tag.t2 { top: 42%; left: -12%; animation-delay: 1.2s; }
.float-tag.t3 { bottom: 14%; right: -10%; animation-delay: 2.4s; }
@keyframes float-tag {
  0%, 100% { transform: translateZ(70px) translateY(0); }
  50% { transform: translateZ(70px) translateY(-10px); }
}
@media (max-width: 480px) {
  .float-tag.t1 { right: -2%; }
  .float-tag.t2 { left: -2%; }
  .float-tag.t3 { right: -2%; }
}

/* ---------- STATS BAR ---------- */
.stats {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 50px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}
@media (max-width: 760px) { .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 36px 20px; } }
.stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  color: var(--text);
  background: linear-gradient(135deg, #fff, var(--primary));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 6px;
  letter-spacing: 0.01em;
}

/* ---------- ABOUT ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 880px) { .about-grid { grid-template-columns: 1fr; } }

.about-text p { color: var(--muted); margin-bottom: 18px; max-width: 580px; }
.about-text p strong { color: var(--text); font-weight: 600; }

.about-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.tag {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 7px 13px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.tag.primary { color: var(--primary); border-color: var(--border-bright); }

.flip-card {
  perspective: 1400px;
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
  aspect-ratio: 3/4;
  cursor: pointer;
}
.flip-inner {
  position: relative;
  width: 100%; height: 100%;
  transition: transform 0.7s var(--ease);
  transform-style: preserve-3d;
}
.flip-card.flipped .flip-inner,
.flip-card:focus-visible .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute; inset: 0;
  border-radius: 18px;
  overflow: hidden;
  backface-visibility: hidden;
  border: 1px solid var(--border);
}
.flip-front img { width: 100%; height: 100%; object-fit: cover; }
.flip-front::after {
  content: "tap to flip";
  position: absolute; bottom: 14px; left: 0; right: 0; text-align: center;
  font-family: var(--font-mono); font-size: 11px; color: var(--primary);
  background: rgba(5,8,22,0.6); padding: 6px 0;
}
.flip-back {
  transform: rotateY(180deg);
  background: var(--bg-panel);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
}
.flip-back .fb-row { font-size: 13px; }
.flip-back .fb-label { font-family: var(--font-mono); color: var(--primary); font-size: 11.5px; display: block; margin-bottom: 3px; }
.flip-back .fb-val { color: var(--muted); }

/* ---------- TECH STACK (3D rotating ring) ---------- */
.stack-wrap { display: flex; flex-direction: column; align-items: center; }
.ring-stage {
  width: 100%;
  max-width: 640px;
  height: 280px;
  perspective: 1000px;
  margin: 10px auto 50px;
  position: relative;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, black 14%, black 86%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0%, black 14%, black 86%, transparent 100%);
}
.ring {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  animation: spin-ring 28s linear infinite;
}
.ring-stage:hover .ring,
.ring.paused { animation-play-state: paused; }
@keyframes spin-ring { from { transform: rotateY(0deg); } to { transform: rotateY(360deg); } }

.ring-chip {
  position: absolute;
  top: 50%; left: 50%;
  width: 124px;
  margin: -22px 0 0 -62px;
  padding: 11px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  border-radius: 10px;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: border-color 0.25s, box-shadow 0.25s, color 0.25s;
}
.ring-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 24px -4px var(--danger-glow);
}

.exploring-row { text-align: center; }
.exploring-label {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--muted-dim);
  margin-bottom: 16px; display: block;
}
.exploring-chips { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.tag.dashed {
  border-style: dashed;
  color: var(--accent-warm);
  border-color: rgba(255,180,84,0.4);
}

/* Static fallback grid for small screens / reduced motion */
.ring-fallback { display: none; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 10px auto 50px; max-width: 640px; }
@media (max-width: 680px) {
  .ring-stage { display: none; }
  .ring-fallback { display: flex; }
}

/* ---------- TIMELINE ---------- */
.timeline { position: relative; max-width: 760px; margin: 0 auto; }
.timeline-track {
  position: absolute;
  left: 9px; top: 6px; bottom: 6px;
  width: 2px;
  background: var(--border);
}
.timeline-progress {
  position: absolute;
  left: 9px; top: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  height: 0%;
  transition: height 0.3s linear;
  box-shadow: 0 0 8px var(--primary);
}
.timeline-item {
  position: relative;
  padding-left: 42px;
  margin-bottom: 50px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.timeline-item.in-view { opacity: 1; transform: translateY(0); }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: 0; top: 4px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--bg-panel);
  border: 2px solid var(--border);
  transition: border-color 0.4s, box-shadow 0.4s;
}
.timeline-item.in-view .timeline-dot {
  border-color: var(--primary);
  box-shadow: 0 0 14px var(--danger-glow);
}
.timeline-date {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--primary); margin-bottom: 6px; display: block;
}
.timeline-role { font-family: var(--font-display); font-weight: 600; font-size: 19px; margin-bottom: 4px; }
.timeline-org { color: var(--muted); font-size: 13.5px; margin-bottom: 12px; }
.timeline-desc { color: var(--muted); font-size: 14.5px; max-width: 600px; }

/* ---------- PROJECTS ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}
@media (max-width: 760px) { .projects-grid { grid-template-columns: 1fr; } }

.project-card {
  padding: 28px;
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  transition: transform 0.35s var(--ease), border-color 0.35s;
}
.project-card:hover { border-color: var(--border-bright); }
.project-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; gap: 12px; }
.project-name { font-family: var(--font-display); font-weight: 600; font-size: 20px; }
.status-badge {
  font-family: var(--font-mono); font-size: 11px; padding: 5px 10px; border-radius: 14px;
  white-space: nowrap;
  border: 1px solid var(--border-bright); color: var(--primary);
}
.status-badge.dashed { border-style: dashed; border-color: rgba(255,180,84,0.4); color: var(--accent-warm); }
.project-desc { color: var(--muted); font-size: 14.5px; margin-bottom: 18px; }
.project-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.project-tags .tag { font-size: 11px; padding: 5px 10px; }
.project-link {
  font-family: var(--font-mono); font-size: 13px; color: var(--text);
  display: inline-flex; align-items: center; gap: 6px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}
.project-link:hover { color: var(--primary); border-color: var(--primary); }

/* ---------- ARCHITECTURE LAB ---------- */
.arch-diagram {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0;
  margin: 50px 0 30px;
  overflow-x: auto;
  padding: 10px;
}
.arch-node {
  flex: 0 0 auto;
  width: 130px;
  text-align: center;
  padding: 18px 10px;
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.arch-node .ic { font-size: 22px; margin-bottom: 8px; }
.arch-node.active { border-color: var(--primary); box-shadow: 0 0 26px -6px var(--danger-glow); transform: translateY(-4px); }
.arch-connector {
  flex: 1 1 auto;
  min-width: 30px;
  height: 2px;
  background: var(--border);
  position: relative;
  margin: 0 -1px;
}
.arch-connector .flow-dot {
  position: absolute;
  top: -3px; left: 0;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px var(--primary);
  opacity: 0;
}
.arch-connector.flowing .flow-dot { animation: flow-along 1.1s var(--ease) forwards; }
@keyframes flow-along {
  0% { left: 0; opacity: 1; }
  90% { opacity: 1; }
  100% { left: calc(100% - 8px); opacity: 0; }
}
.arch-note {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  margin-top: 10px;
}
.arch-note .hl { color: var(--primary); }

/* ---------- CONTACT ---------- */
.contact-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.contact-card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(0,217,255,0.12), transparent 60%);
  pointer-events: none;
}
.contact-card h2 { font-family: var(--font-display); font-size: clamp(26px, 4vw, 36px); margin-bottom: 12px; }
.contact-card p { color: var(--muted); margin-bottom: 34px; }
.contact-links { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
@media (max-width: 560px) { .contact-card { padding: 40px 24px; } }

/* ---------- FOOTER ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted-dim);
}

/* Reveal-on-scroll generic */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in-view { opacity: 1; transform: translateY(0); }