:root {
  --bg: #0c0e12;
  --bg-elevated: #12151c;
  --bg-card: #161a22;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8eaef;
  --text-muted: #9aa3b2;
  --accent: #3dd6c6;
  --accent-dim: rgba(61, 214, 198, 0.15);
  --accent-glow: rgba(61, 214, 198, 0.35);
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --header-h: 64px;
  --max: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: #5fe8db;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(12, 14, 18, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--text);
  text-decoration: none;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem 1.25rem;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

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

.nav-cta {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent) !important;
  border: 1px solid rgba(61, 214, 198, 0.35);
}

.nav-cta:hover {
  background: rgba(61, 214, 198, 0.25);
  color: #b8fff6 !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

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

  .site-nav a {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
  }

  .site-nav a:hover {
    background: var(--bg-card);
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 0;
  display: flex;
  align-items: center;
  padding-block: 2.25rem 2.75rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: -40% -20% auto;
  height: 80%;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, var(--accent-glow), transparent 65%),
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(100, 120, 255, 0.12), transparent 50%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 880px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(240px, 0.88fr);
    gap: 2rem 2.5rem;
  }

  .hero-visual {
    justify-self: stretch;
  }
}

.hero-content {
  min-width: 0;
}

.hero-visual {
  min-width: 0;
  max-width: 22rem;
  margin-inline: auto;
}

@media (min-width: 880px) {
  .hero-visual {
    max-width: none;
    margin-inline: 0;
  }
}

/* Square portrait (not circle) */
.hero-photo-frame {
  position: relative;
  width: min(21rem, 82vw);
  aspect-ratio: 1;
  margin-inline: auto;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--bg-card);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(61, 214, 198, 0.12),
    inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

@media (min-width: 880px) {
  .hero-photo-frame {
    width: min(22.5rem, 28vw);
    max-width: 24rem;
    margin-left: auto;
    margin-right: 0;
  }
}

.hero-photo-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.hero-photo {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 58% 26%;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 0.5rem;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 1rem;
}

.hero-tagline {
  max-width: 36rem;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #5fe8db;
  border-color: #5fe8db;
  color: var(--bg);
}

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

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

/* Sections */
.section {
  padding-block: 4.5rem;
}

.section-about {
  padding-block: 2.75rem 4.5rem;
}

.section-alt {
  background: var(--bg-elevated);
  border-block: 1px solid var(--border);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.prose p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  max-width: 65ch;
}

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

.about-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 720px) {
  .about-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-grid p:last-child {
    grid-column: 1 / -1;
  }
}

/* Jobs */
.job {
  margin-bottom: 3rem;
  padding: 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.job:last-child {
  margin-bottom: 0;
}

.job-past {
  margin-top: 2rem;
}

.job-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.job-role {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.job-company {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin: 0;
}

.job-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
  white-space: nowrap;
}

.job-block {
  margin-bottom: 1.5rem;
}

.job-block:last-child {
  margin-bottom: 0;
}

.job-project {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 0.5rem;
}

.job ul,
.job-past ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--text-muted);
}

.job li,
.job-past li {
  margin-bottom: 0.5rem;
}

.job li:last-child,
.job-past li:last-child {
  margin-bottom: 0;
}

/* Case study: Quran verification */
.section-case {
  border-top: 1px solid var(--border);
}

.case-lead {
  margin: 0 0 2rem;
  max-width: 62ch;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.case-layout {
  display: grid;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 960px) {
  .case-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  }
}

.case-subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin: 0 0 1rem;
}

/* Unified diagram theme (DeepFakeNet-style: light surface, pastel nodes, legend) */
.diagram-block-title {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

.diagram-surface--snug {
  padding: 1rem 1rem 0.75rem;
}

.diagram-surface--snug .diagram-scroll {
  margin-bottom: 0.5rem;
}

.diagram-surface {
  --d-ink: #1e293b;
  --d-ink-muted: #475569;
  --d-line: #4b5563;
  --d-page: #f3f2ef;
  --d-purple-fill: #ede9fe;
  --d-purple-stroke: #7c3aed;
  --d-purple-text: #5b21b6;
  --d-green-fill: #dcfce7;
  --d-green-stroke: #16a34a;
  --d-green-text: #14532d;
  --d-ai-fill: #ffedd5;
  --d-ai-stroke: #ea580c;
  --d-ai-text: #9a3412;
  --d-blue-fill: #dbeafe;
  --d-blue-stroke: #2563eb;
  --d-blue-text: #1e3a8a;
  --d-gray-fill: #f3f4f6;
  --d-gray-stroke: #4b5563;
  --d-gray-text: #374151;
  --d-env-fill: #ffedd5;
  --d-env-stroke: #c2410c;
  --d-env-text: #9a3412;
  padding: 1.25rem 1.35rem 1.1rem;
  background: var(--d-page);
  border-radius: 20px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.diagram-scroll {
  overflow-x: auto;
  margin: 0 0 0.85rem;
  padding: 0.5rem 0.25rem;
  -webkit-overflow-scrolling: touch;
}

.diagram-flow-svg {
  display: block;
  min-width: 760px;
  width: 100%;
  height: auto;
}

.diagram-flow-svg .flow-rect {
  stroke-width: 1.75;
}

.diagram-flow-svg .flow-rect--purple {
  fill: var(--d-purple-fill);
  stroke: var(--d-purple-stroke);
}

.diagram-flow-svg .flow-rect--green {
  fill: var(--d-green-fill);
  stroke: var(--d-green-stroke);
}

.diagram-flow-svg .flow-rect--ai {
  fill: var(--d-ai-fill);
  stroke: var(--d-ai-stroke);
}

.diagram-flow-svg .flow-rect--blue {
  fill: var(--d-blue-fill);
  stroke: var(--d-blue-stroke);
}

.diagram-flow-svg .flow-rect--gray {
  fill: var(--d-gray-fill);
  stroke: var(--d-gray-stroke);
}

.diagram-flow-svg .flow-rect--env {
  fill: var(--d-env-fill);
  stroke: var(--d-env-stroke);
}

.diagram-flow-svg--slack {
  min-width: 640px;
}

.diagram-flow-svg--project {
  min-width: 560px;
}

.diagram-flow-svg--skill {
  min-width: 720px;
}

.diagram-flow-svg .flow-t {
  fill: var(--d-ink);
  font-family: var(--font-sans), system-ui, sans-serif;
  font-size: 12px;
  font-weight: 700;
}

.diagram-flow-svg .flow-sub {
  fill: var(--d-ink-muted);
  font-family: var(--font-sans), system-ui, sans-serif;
  font-size: 9.5px;
  font-weight: 500;
}

.diagram-figure {
  margin: 0 0 1rem;
}

.diagram-frame {
  display: block;
  line-height: 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, 0.1);
  background: #fff;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.diagram-frame:hover {
  border-color: rgba(124, 58, 237, 0.35);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
}

.diagram-frame--dark {
  background: #0c0c0e;
}

.diagram-frame--dark:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.diagram-frame img {
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.diagram-caption {
  margin: 0.75rem 0 0.65rem;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--d-ink-muted);
}

.diagram-caption strong {
  color: var(--d-ink);
  font-weight: 600;
}

.diagram-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin: 0;
  padding: 0.65rem 0 0;
  list-style: none;
  border-top: 1px solid rgba(15, 23, 42, 0.08);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--d-ink-muted);
}

.diagram-legend--compact {
  gap: 0.5rem 1rem;
  font-size: 0.68rem;
}

.diagram-legend li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.diagram-legend-swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
  border: 1px solid rgba(15, 23, 42, 0.15);
}

.diagram-legend-swatch--purple {
  background: var(--d-purple-fill);
  border-color: var(--d-purple-stroke);
}

.diagram-legend-swatch--green {
  background: var(--d-green-fill);
  border-color: var(--d-green-stroke);
}

.diagram-legend-swatch--ai {
  background: var(--d-ai-fill);
  border-color: var(--d-ai-stroke);
}

.diagram-legend-swatch--blue {
  background: var(--d-blue-fill);
  border-color: var(--d-blue-stroke);
}

.diagram-legend-swatch--gray {
  background: var(--d-gray-fill);
  border-color: var(--d-gray-stroke);
}

.diagram-legend-swatch--env {
  background: var(--d-env-fill);
  border-color: var(--d-env-stroke);
}

.project-diagram-block {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.project-case-title {
  margin: 0 0 0.65rem;
  font-size: clamp(1.25rem, 2.5vw, 1.55rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.project-diagram-block .case-lead {
  margin-bottom: 1.25rem;
  font-size: 0.98rem;
}

.project-diagram-block .case-lead code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--accent);
}

.project-diagram-block .arch-panel .diagram-figure {
  margin-bottom: 0;
}

.project-diagram-link {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
}

.project-diagram-link a {
  font-weight: 600;
  text-decoration: none;
}

.project-diagram-link a:hover {
  text-decoration: underline;
}

.case-bullets {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

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

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

.chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* Projects */
.project-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .project-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .project-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  border-color: rgba(61, 214, 198, 0.35);
  box-shadow: 0 0 0 1px var(--accent-dim);
}

.project-card h3 {
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
}

.project-stack {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

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

/* Skills */
.skills-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.skill-group {
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.skill-group-wide {
  grid-column: 1 / -1;
}

.skill-group h3 {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 0.6rem;
}

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

/* Education */
.edu-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
}

.edu-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.edu-school {
  margin: 0;
  color: var(--text-muted);
}

.edu-gpa {
  margin: 0.75rem 0 0;
  font-size: 0.95rem;
  color: var(--text);
}

.edu-highlight {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem 1.5rem;
  background: var(--accent-dim);
  border: 1px solid rgba(61, 214, 198, 0.25);
  border-radius: var(--radius);
}

.edu-highlight p {
  margin: 0;
  color: var(--text-muted);
}

.edu-badge {
  font-size: 1.5rem;
  line-height: 1;
}

/* Contact */
.section-contact {
  text-align: center;
  padding-block: 5rem;
}

.contact-inner .section-title {
  margin-inline: auto;
}

.contact-inner > p {
  color: var(--text-muted);
  max-width: 32rem;
  margin: 0 auto 1.75rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.resume-note {
  margin: 0;
  font-size: 0.9rem;
}

.resume-note a {
  color: var(--text-muted);
}

.resume-note a:hover {
  color: var(--accent);
}

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

.footer-inner {
  text-align: center;
}

.footer-inner p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}