/* ==========================================================================
   Nayab Gull — Portfolio
   Theme: Interactive Notebook (base) + AI Network (accent)
   ========================================================================== */

:root {
  /* Core palette */
  --bg: #0D1117;
  --bg-raised: #12181f;
  --bg-cell: #0F151C;
  --border: #202834;
  --border-soft: #1a212b;
  --text: #E6E8EB;
  --text-dim: #8B93A1;
  --text-faint: #5A6270;

  --teal: #5EEAD4;
  --teal-dim: rgba(94, 234, 212, 0.14);
  --amber: #F4A261;
  --amber-dim: rgba(244, 162, 97, 0.14);

  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius: 10px;
  --radius-sm: 6px;
  --container-w: 1120px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@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;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { margin: 0; }

/* subtle background grain / vignette so the flat dark bg isn't dead */
.grain-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(94,234,212,0.06), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 20%, rgba(244,162,97,0.045), transparent 60%);
}

/* ==========================================================================
   Notebook cell — the recurring signature component
   ========================================================================== */

.notebook-cell {
  background: var(--bg-cell);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 0 rgba(255,255,255,0.02) inset, 0 20px 40px -24px rgba(0,0,0,0.6);
  position: relative;
  isolation: isolate;
  transition: border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
  --mx: 50%;
  --my: 50%;
}

/* cursor-reactive glow — follows pointer, sits behind content */
.notebook-cell::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  background: radial-gradient(420px circle at var(--mx) var(--my), rgba(94,234,212,0.10), transparent 65%);
  pointer-events: none;
}
.notebook-cell:hover::before { opacity: 1; }
.notebook-cell:hover {
  border-color: rgba(94,234,212,0.28);
  box-shadow: 0 1px 0 rgba(255,255,255,0.02) inset, 0 24px 50px -20px rgba(0,0,0,0.65);
}
.notebook-cell > * { position: relative; z-index: 1; }

/* thin animated accent line along the top edge */
.notebook-cell::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 2;
  background: linear-gradient(90deg, transparent, var(--teal), var(--amber), transparent);
  background-size: 200% 100%;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  animation: shimmer 3.5s linear infinite;
}
.notebook-cell:hover::after { opacity: 0.7; }
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.cell-chrome {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  background: var(--bg-raised);
  border-bottom: 1px solid var(--border);
}

.cell-dots {
  display: flex;
  gap: 6px;
}
.cell-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--border);
}
.cell-dots span:nth-child(1) { background: #E5766D; opacity: 0.55; }
.cell-dots span:nth-child(2) { background: var(--amber); opacity: 0.55; }
.cell-dots span:nth-child(3) { background: var(--teal); opacity: 0.55; }

.cell-path {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.02em;
}

.cell-body {
  padding: 26px 28px 30px;
}

.prompt-line {
  font-family: var(--font-mono);
  font-size: 14px;
  margin: 0 0 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.prompt-label {
  font-family: var(--font-mono);
  font-weight: 600;
  white-space: nowrap;
}
.in-label { color: var(--amber); }
.out-label {
  color: var(--teal);
  font-size: 14px;
  margin: 0 0 10px;
  display: block;
}
.prompt-code { color: var(--text-dim); }

/* ==========================================================================
   Header / Nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 17, 23, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}

.nav-cell {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  letter-spacing: 0.01em;
}
.cursor-blip {
  color: var(--teal);
  animation: blink 1.1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  transition: color 0.2s var(--ease);
  display: inline-flex;
  gap: 6px;
  align-items: baseline;
}
.nav-links a:hover { color: var(--teal); }
.nav-num {
  color: var(--text-faint);
  font-size: 11px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  padding: 80px 0 60px;
  position: relative;
  z-index: 2;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-cell {
  width: 100%;
  max-width: 760px;
  transition: transform 0.35s var(--ease);
  will-change: transform;
}

.hero-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 44px);
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 6px;
  min-height: 1.15em;
}

.typed-target { color: var(--teal); }
.type-caret {
  color: var(--teal);
  animation: blink 1s step-end infinite;
  font-weight: 400;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(14px, 2vw, 17px);
  color: var(--amber);
  margin: 0 0 18px;
  min-height: 1.4em;
}

.hero-desc {
  color: var(--text-dim);
  font-size: 15px;
  max-width: 52ch;
  margin: 0 0 24px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
}
.hero-tags li {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal);
  background: var(--teal-dim);
  border: 1px solid rgba(94,234,212,0.25);
  border-radius: 5px;
  padding: 5px 10px;
}

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

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
  border: 1px solid transparent;
}
.btn-glyph { font-size: 12px; }

.btn-primary {
  background: var(--teal);
  color: #06171A;
  position: relative;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: var(--teal);
  filter: blur(10px);
  opacity: 0;
  z-index: -1;
  transition: opacity 0.3s var(--ease);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px -8px rgba(94,234,212,0.45);
}
.btn-primary:hover::after { opacity: 0.5; }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover {
  border-color: var(--amber);
  color: var(--amber);
  transform: translateY(-2px);
}

.hero-scroll-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 40px;
  letter-spacing: 0.05em;
}
.scroll-arrow {
  display: inline-block;
  animation: bob 1.8s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ==========================================================================
   Sections (generic)
   ========================================================================== */

.section {
  padding: 90px 0;
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--border-soft);
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.eyebrow-tag {
  color: var(--teal);
  border: 1px solid rgba(94,234,212,0.3);
  border-radius: 4px;
  padding: 2px 7px;
  font-size: 11px;
}

.section-title {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 44px;
  max-width: 26ch;
}

/* ==========================================================================
   About + network canvas + stats
   ========================================================================== */

#about { overflow: hidden; }

.network-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 28px;
  align-items: stretch;
  position: relative;
  z-index: 1;
}

.about-text {
  color: var(--text-dim);
  font-size: 15px;
  margin: 0 0 16px;
}
.about-text:last-child { margin-bottom: 0; }
.about-text strong { color: var(--text); font-weight: 600; }

.stats-row {
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: center;
}

.stat-cell {
  background: var(--bg-cell);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  text-align: left;
}

.stat-number {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  margin-bottom: 6px;
  background: linear-gradient(120deg, var(--teal), var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label {
  font-size: 12.5px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Skills
   ========================================================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}

.skill-card {
  background: var(--bg-cell);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
  position: relative;
  isolation: isolate;
  --mx: 50%;
  --my: 50%;
}
.skill-card::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  background: radial-gradient(300px circle at var(--mx) var(--my), rgba(244,162,97,0.09), transparent 65%);
  pointer-events: none;
}
.skill-card:hover::before { opacity: 1; }
.skill-card > * { position: relative; z-index: 1; }
.skill-card:hover {
  border-color: rgba(94,234,212,0.35);
  transform: translateY(-3px);
}

.skill-card-title {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.skill-card-title::before {
  content: '#';
  color: var(--text-faint);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.skill-tags li {
  font-size: 12.5px;
  color: var(--text-dim);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 5px 9px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.skill-card:hover .skill-tags li:hover {
  color: var(--teal);
  border-color: rgba(94,234,212,0.3);
}

/* ==========================================================================
   Projects
   ========================================================================== */

.projects-subsection {
  margin-bottom: 52px;
}
.projects-subsection:last-child { margin-bottom: 0; }

.subsection-title {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text);
  margin: 0 0 22px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.subsection-icon {
  color: var(--teal);
  font-size: 11px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--bg-cell);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease), border-color 0.28s var(--ease);
  display: flex;
  flex-direction: column;
  position: relative;
  isolation: isolate;
  transform-style: preserve-3d;
  will-change: transform;
  --mx: 50%;
  --my: 50%;
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  background: radial-gradient(360px circle at var(--mx) var(--my), rgba(94,234,212,0.12), transparent 65%);
  pointer-events: none;
}
.project-card:hover::before { opacity: 1; }
.project-card > * { position: relative; z-index: 1; }

.project-card:hover {
  border-color: rgba(94,234,212,0.4);
  box-shadow: 0 24px 48px -20px rgba(94,234,212,0.22);
}

.project-card .cell-chrome {
  padding: 9px 16px;
}

.project-card-body {
  padding: 20px 20px 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-title {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 10px;
}

.project-desc {
  font-size: 13.5px;
  color: var(--text-dim);
  margin: 0 0 16px;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}
.project-tags li {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
  background: var(--amber-dim);
  border: 1px solid rgba(244,162,97,0.25);
  border-radius: 4px;
  padding: 4px 8px;
}

.project-links {
  display: flex;
  gap: 10px;
}

.project-link {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.project-link:hover {
  border-color: var(--teal);
  color: var(--teal);
}
.project-link.demo-link {
  border-color: rgba(94,234,212,0.3);
  color: var(--teal);
}
.project-link.demo-link:hover {
  background: var(--teal-dim);
}

/* ==========================================================================
   Experience timeline
   ========================================================================== */

.timeline {
  border-left: 1px solid var(--border);
  margin-left: 6px;
  padding-left: 30px;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.timeline-item {
  position: relative;
}

.timeline-marker {
  position: absolute;
  left: -36px;
  top: 4px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--teal);
}

.timeline-role {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text);
  margin: 0 0 4px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.timeline-badge {
  font-size: 10.5px;
  color: var(--amber);
  background: var(--amber-dim);
  border: 1px solid rgba(244,162,97,0.25);
  border-radius: 4px;
  padding: 2px 7px;
  font-family: var(--font-mono);
}

.timeline-org {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  margin: 4px 0 0;
}

/* ==========================================================================
   Research
   ========================================================================== */

.research-status {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal);
  margin: 0 0 12px;
}

.research-title {
  font-family: var(--font-body);
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  margin: 0 0 14px;
}

.research-role {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--amber);
  margin: 0 0 12px;
}

.research-desc {
  color: var(--text-dim);
  font-size: 14.5px;
  margin: 0;
  max-width: 65ch;
}

/* ==========================================================================
   Achievements
   ========================================================================== */

.achievements-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

.achievement-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--bg-cell);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.achievement-item:hover {
  border-color: rgba(244,162,97,0.35);
  transform: translateY(-2px);
}

.achievement-icon {
  font-size: 18px;
  line-height: 1;
  margin-top: 2px;
}

.achievement-title {
  font-size: 14px;
  color: var(--text);
  margin: 0 0 4px;
  font-weight: 500;
}

.achievement-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  margin: 0;
}

/* ==========================================================================
   Contact
   ========================================================================== */

.section-contact { padding-bottom: 110px; }

.contact-title {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 28px);
  color: var(--text);
  margin: 0 0 10px;
}

.contact-sub {
  color: var(--text-dim);
  font-size: 14.5px;
  margin: 0 0 26px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.contact-link {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}
.contact-link:hover {
  border-color: var(--teal);
  color: var(--teal);
  transform: translateY(-2px);
}
.contact-icon {
  font-size: 13px;
  color: var(--amber);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 26px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-text {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  margin: 0;
}

/* ==========================================================================
   Scroll reveal
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 860px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .stats-row {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .stat-cell { flex: 1; min-width: 140px; }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-raised);
    border-bottom: 1px solid var(--border);
    padding: 10px 28px 20px;
    gap: 16px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s var(--ease), padding 0.3s var(--ease);
  }
  .nav-links.is-open {
    max-height: 420px;
    padding: 16px 28px 22px;
  }

  .hero { padding: 56px 0 40px; }
  .cell-body { padding: 20px 18px 24px; }
  .section { padding: 64px 0; }
}

@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .contact-links { flex-direction: column; }
}