/* ============================================================
   DIWAKAR GUPTA PORTFOLIO — style.css
   Palette: near-black base, electric indigo accent, monospace details
   ============================================================ */

:root {
  --bg:          #09090f;
  --bg-alt:      #0f0f1a;
  --surface:     #13131f;
  --border:      #1e1e30;
  --accent:      #7b6ef6;
  --accent-dim:  rgba(123, 110, 246, 0.15);
  --accent-glow: rgba(123, 110, 246, 0.35);
  --text:        #e4e4f0;
  --text-muted:  #7a7a9a;
  --text-faint:  #3a3a55;
  --success:     #4ade80;

  --font-sans:  'Space Grotesk', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;

  --radius:     6px;
  --radius-lg:  12px;
  --transition: 0.2s ease;

  --container: 1100px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(var(--container), 100% - 3rem);
  margin-inline: auto;
}

/* ============================================================
   HEADER / NAV
   ============================================================ */
.header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 100;
  padding: 1.25rem 0;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.header.scrolled {
  background: rgba(9, 9, 15, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover { color: var(--text); background: var(--surface); }

.btn-resume {
  color: var(--accent);
  border: 1px solid var(--accent);
  margin-left: 0.5rem;
}

.btn-resume:hover {
  background: var(--accent-dim);
  color: var(--accent);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  padding-top: 6rem;
  overflow: hidden;
}

/* Noise/grain texture */
.hero-noise {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 128px;
  opacity: 0.6;
}

/* Subtle radial glow behind hero text */
.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  left: -10%;
  width: 60%;
  height: 70%;
  background: radial-gradient(ellipse at center, rgba(123, 110, 246, 0.08) 0%, transparent 65%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding-block: 4rem 6rem;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--success);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-name {
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.hero-name-accent { color: var(--accent); }

.hero-role {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  min-height: 2em;
}

.prompt-char { color: var(--accent); }

.cursor-blink {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-desc {
  max-width: 540px;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

/* Metrics row */
.hero-metrics {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.metric-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.03em;
}

.metric-x { color: var(--accent); }

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.metric-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
  margin: 0 1rem;
  align-self: center;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-faint);
  font-size: 0.7rem;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 1;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-faint), transparent);
  animation: scrollfade 2s ease-in-out infinite;
}

@keyframes scrollfade {
  0%, 100% { opacity: 0.3; transform: scaleY(1); transform-origin: top; }
  50% { opacity: 1; }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #9488f8;
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* ============================================================
   SECTIONS — shared
   ============================================================ */
.section {
  padding-block: 7rem;
}

.section-alt {
  background: var(--bg-alt);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}

.section-heading {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 3rem;
  color: var(--text);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.about-body {
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.social-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.social-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: color var(--transition), border-color var(--transition);
}

.social-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.skills-block {
  margin-bottom: 1.75rem;
}

.skills-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  transition: border-color var(--transition), color var(--transition);
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================================
   EXPERIENCE
   ============================================================ */
.exp-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.exp-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  padding-block: 2.5rem;
  border-top: 1px solid var(--border);
}

.exp-item:last-child { border-bottom: 1px solid var(--border); }

.exp-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-top: 0.2rem;
}

.exp-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.exp-tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.exp-role {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.exp-company { margin-bottom: 1rem; }

.company-link {
  font-size: 0.95rem;
  color: var(--accent);
  font-weight: 500;
}

.company-link:hover { text-decoration: underline; }

.exp-bullets {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.exp-bullets li {
  font-size: 0.93rem;
  color: var(--text-muted);
  padding-left: 1.2rem;
  position: relative;
  line-height: 1.65;
}

.exp-bullets li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.exp-bullets strong { color: var(--text); font-weight: 600; }

.exp-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.project-card {
  background: var(--bg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: background var(--transition);
  position: relative;
}

.project-card:hover { background: var(--surface); }

/* Featured card spans two rows */
.project-card.featured {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
}

.project-img-wrap {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  margin-bottom: 1.25rem;
  background: var(--surface);
}

.project-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(30%);
  transition: filter var(--transition), transform 0.4s ease;
}

.project-card:hover .project-img-wrap img {
  filter: grayscale(0%);
  transform: scale(1.02);
}

.project-img-wrap.no-img {
  background: linear-gradient(135deg, var(--surface) 0%, var(--bg-alt) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-img-overlay {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
}

.project-img-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--accent);
  color: #fff;
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
}

.project-body { flex: 1; display: flex; flex-direction: column; }

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.project-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.icon-link {
  color: var(--text-faint);
  transition: color var(--transition);
  padding: 4px;
}

.icon-link:hover { color: var(--accent); }

.project-stat-inline {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

.project-stat-inline span { color: var(--accent); font-weight: 600; }

.project-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 1rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}

.tech-pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
  background: transparent;
  border: 1px solid var(--border);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
}

/* ============================================================
   CONTACT
   ============================================================ */
.section-contact {
  background: var(--bg-alt);
  position: relative;
  overflow: hidden;
}

.section-contact::before {
  content: '';
  position: absolute;
  bottom: -20%;
  right: -10%;
  width: 50%;
  height: 80%;
  background: radial-gradient(ellipse at center, rgba(123, 110, 246, 0.06) 0%, transparent 65%);
  pointer-events: none;
}

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

.contact-heading {
  margin-bottom: 1rem;
}

.contact-sub {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 2rem;
  max-width: 480px;
}

.contact-links {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding-block: 1.5rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
}

/* ============================================================
   REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

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

  .project-card.featured {
    grid-column: span 2;
    grid-row: span 1;
  }

  .exp-item {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .exp-meta {
    flex-direction: row;
    align-items: center;
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    inset: 0 0 0 30%;
    background: rgba(9, 9, 15, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem;
    gap: 0.5rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 99;
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-link {
    font-size: 1.1rem;
    padding: 0.6rem 0.8rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    border-radius: var(--radius);
  }

  .project-card.featured {
    grid-column: span 1;
  }

  .hero-metrics {
    gap: 0.75rem;
  }

  .metric-divider { display: none; }

  .section { padding-block: 4.5rem; }

  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}