:root {
  color-scheme: dark;
  --bg: #0b1220;
  --bg-soft: #111a2d;
  --surface: rgba(17, 26, 45, 0.7);
  --surface-border: rgba(148, 163, 184, 0.22);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --heading: #f8fafc;
  --nav-brand: #f8fafc;
  --nav-link: #cbd5e1;
  --nav-link-active: #fff;
  --lead: #d6deeb;
  --contact-text: #cbd5e1;
  --card-bg: rgba(15, 23, 42, 0.65);
  --card-text: #d0d9e8;
  --meta: #93c5fd;
  --icon-bg: rgba(15, 23, 42, 0.68);
  --icon-color: #c7d2fe;
  --social-bg: rgba(148, 163, 184, 0.14);
  --social-border: rgba(148, 163, 184, 0.2);
  --social-color: #cbd5e1;
  --nav-bg: rgba(11, 18, 32, 0.7);
  --nav-border: rgba(99, 102, 241, 0.25);
  --eyebrow-border: rgba(129, 140, 248, 0.4);
  --eyebrow-text: #c7d2fe;
  --btn-outline-border: rgba(226, 232, 240, 0.45);
  --btn-outline-text: #e2e8f0;
  --btn-outline-hover-border: rgba(34, 211, 238, 0.8);
  --btn-outline-hover-bg: rgba(34, 211, 238, 0.15);
  --btn-outline-hover-text: #d1f7ff;
  --primary: #6366f1;
  --primary-soft: #818cf8;
  --accent: #22d3ee;
  --shadow: 0 18px 40px rgba(2, 8, 23, 0.35);
}

[data-theme='light'] {
  color-scheme: light;
  --bg: #f8fafc;
  --bg-soft: #f1f5f9;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-border: rgba(15, 23, 42, 0.1);
  --text: #0f172a;
  --muted: #475569;
  --heading: #0f172a;
  --nav-brand: #0f172a;
  --nav-link: #334155;
  --nav-link-active: #0f172a;
  --lead: #334155;
  --contact-text: #334155;
  --card-bg: rgba(255, 255, 255, 0.95);
  --card-text: #1e293b;
  --meta: #1d4ed8;
  --icon-bg: rgba(248, 250, 252, 1);
  --icon-color: #3730a3;
  --social-bg: rgba(15, 23, 42, 0.06);
  --social-border: rgba(15, 23, 42, 0.12);
  --social-color: #334155;
  --nav-bg: rgba(248, 250, 252, 0.86);
  --nav-border: rgba(99, 102, 241, 0.18);
  --eyebrow-border: rgba(99, 102, 241, 0.4);
  --eyebrow-text: #4338ca;
  --btn-outline-border: rgba(99, 102, 241, 0.45);
  --btn-outline-text: #3730a3;
  --btn-outline-hover-border: rgba(99, 102, 241, 0.85);
  --btn-outline-hover-bg: rgba(99, 102, 241, 0.12);
  --btn-outline-hover-text: #312e81;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(99, 102, 241, 0.28), transparent 55%),
    radial-gradient(900px 500px at -20% 20%, rgba(34, 211, 238, 0.15), transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.65;
  padding-top: 82px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin-top: 0;
  color: var(--heading);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
}

a {
  color: var(--primary-soft);
  transition: color 0.25s ease;
}

a:hover,
a:focus,
a:active {
  color: var(--accent);
  text-decoration: none;
}

#sideNav {
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--nav-border);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

#sideNav .navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1rem;
  color: var(--nav-brand);
}

.brand-avatar {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.45);
}

#sideNav .navbar-nav .nav-item .nav-link {
  color: var(--nav-link);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

#sideNav .navbar-nav .nav-item .nav-link:hover,
#sideNav .navbar-nav .nav-item .nav-link.active {
  color: var(--nav-link-active);
}

.portfolio-main {
  max-width: 1100px;
  padding-bottom: 4rem;
}

.resume-section {
  margin: 0 0 1.5rem;
  padding: 2.1rem;
  border: 1px solid var(--surface-border);
  border-radius: 1.2rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-section {
  overflow: hidden;
  position: relative;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: linear-gradient(45deg, rgba(34, 211, 238, 0.2), rgba(99, 102, 241, 0.28));
  pointer-events: none;
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.25rem 0.8rem;
  border: 1px solid var(--eyebrow-border);
  border-radius: 999px;
  color: var(--eyebrow-text);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-section h1 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.hero-section h1 span {
  color: var(--accent);
}

.lead-text {
  max-width: 760px;
  margin-bottom: 1.4rem;
  color: var(--lead);
  font-size: 1.05rem;
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1.4rem;
}

.contact-row a,
.contact-row span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.72rem;
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 0.65rem;
  color: var(--contact-text);
  font-size: 0.9rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}

.btn {
  border-radius: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.62rem 1.05rem;
}

.btn-primary {
  border: none;
  background: linear-gradient(135deg, var(--primary), #4f46e5);
}

.btn-primary:hover,
.btn-primary:focus {
  background: linear-gradient(135deg, #5558ee, #4338ca);
}

.btn-outline-light {
  border-color: var(--btn-outline-border);
  color: var(--btn-outline-text);
}

.btn-outline-light:hover,
.btn-outline-light:focus {
  border-color: var(--btn-outline-hover-border);
  background: var(--btn-outline-hover-bg);
  color: var(--btn-outline-hover-text);
}

.list-social-icons a {
  width: 2.4rem;
  height: 2.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.65rem;
  margin-right: 0.4rem;
  background: var(--social-bg);
  border: 1px solid var(--social-border);
  color: var(--social-color);
}

.list-social-icons a:hover {
  color: #fff;
  border-color: rgba(99, 102, 241, 0.75);
  background: rgba(99, 102, 241, 0.35);
}

.section-header {
  margin-bottom: 1.3rem;
}

.section-header h2 {
  margin-bottom: 0.35rem;
  font-size: clamp(1.45rem, 3.3vw, 2rem);
}

.section-header p {
  margin: 0;
  color: var(--muted);
}

.project-grid,
.timeline-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.certificate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.project-card,
.info-card {
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 0.95rem;
  background: var(--card-bg);
  padding: 1.2rem;
  height: 100%;
}

.project-card h3,
.info-card h3 {
  margin-bottom: 0.6rem;
  font-size: 1.2rem;
}

.project-card p,
.info-card p {
  margin-bottom: 0.6rem;
  color: var(--card-text);
}

.project-meta,
.meta,
.certificate-card .certificate-meta {
  color: var(--meta);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.5rem;
  font-weight: 600;
}

.list-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  font-size: 2.35rem;
  margin-bottom: 0;
}

.list-icons .list-inline-item {
  width: 3.6rem;
  height: 3.6rem;
  margin: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.8rem;
  border: 1px solid rgba(148, 163, 184, 0.26);
  background: var(--icon-bg);
  color: var(--icon-color);
}

.list-icons .list-inline-item i:hover {
  color: #67e8f9;
}

.awards-list li {
  margin-bottom: 0.75rem;
}

.awards-list .fa-trophy {
  color: #fbbf24;
}

.certificate-card {
  display: flex;
  flex-direction: column;
}

.pipeline-showcase {
  --flow-duration: 1.35s;
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 1rem;
  background: rgba(15, 23, 42, 0.28);
  padding: 1.1rem;
  overflow: hidden;
}

.pipeline-interactions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.7rem;
}

.pipeline-chip {
  border: 1px solid rgba(148, 163, 184, 0.34);
  background: rgba(15, 23, 42, 0.28);
  color: var(--card-text);
  border-radius: 999px;
  padding: 0.28rem 0.65rem;
  font-size: 0.74rem;
  line-height: 1.2;
  cursor: pointer;
  transition: all 0.2s ease;
}

.pipeline-chip:hover,
.pipeline-chip:focus {
  border-color: rgba(34, 211, 238, 0.72);
  color: var(--heading);
  outline: none;
}

.pipeline-chip.is-active {
  border-color: rgba(34, 211, 238, 0.92);
  background: rgba(34, 211, 238, 0.16);
  color: var(--heading);
}

.pipeline-status {
  margin-bottom: 0.82rem;
  color: var(--meta);
  font-size: 0.76rem;
}

.pipeline-node {
  border: 1px solid rgba(148, 163, 184, 0.32);
  border-radius: 0.9rem;
  background: var(--card-bg);
  padding: 0.9rem;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.pipeline-architecture {
  --flow-duration: 1.75s;
}

.pipeline-columns {
  display: grid;
  grid-template-columns: minmax(130px, 1fr) 44px minmax(260px, 1.6fr) 44px minmax(130px, 1fr) 44px minmax(110px, 0.8fr);
  gap: 0.65rem;
  align-items: center;
  width: 100%;
  min-width: 0;
}

.pipeline-block {
  border: 1px dashed rgba(148, 163, 184, 0.32);
  border-radius: 0.95rem;
  background: rgba(15, 23, 42, 0.22);
  padding: 0.75rem;
  min-width: 0;
}

.pipeline-block h3 {
  font-size: 0.86rem;
  margin-bottom: 0.6rem;
  color: var(--meta);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pipeline-stack {
  display: grid;
  gap: 0.5rem;
}

.pipeline-stack-tight {
  margin-top: 0.45rem;
}

.pipeline-node strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
  color: var(--heading);
}

.pipeline-node span {
  display: block;
  font-size: 0.76rem;
  line-height: 1.4;
  color: var(--card-text);
}

.pipeline-block-core {
  border-style: solid;
  border-color: rgba(99, 102, 241, 0.4);
}

.pipeline-lane {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px minmax(0, 1fr) 34px minmax(0, 1fr);
  gap: 0.4rem;
  align-items: center;
}

.pipeline-lane + .pipeline-lane {
  margin-top: 0.45rem;
}

.pipeline-mini-node {
  border: 1px solid rgba(148, 163, 184, 0.32);
  border-radius: 0.7rem;
  background: var(--card-bg);
  color: var(--card-text);
  font-size: 0.72rem;
  text-align: center;
  padding: 0.45rem 0.35rem;
  line-height: 1.35;
}

.pipeline-terminal {
  min-width: 0;
}

.pipeline-node-wide {
  border-color: rgba(34, 211, 238, 0.48);
}

.pipeline-architecture [data-pipeline-layer] {
  transition: opacity 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}

.pipeline-architecture.is-filtering [data-pipeline-layer] {
  opacity: 0.34;
  filter: saturate(0.7);
}

.pipeline-architecture.is-filtering [data-pipeline-layer].is-match {
  opacity: 1;
  filter: none;
}

.pipeline-architecture.is-filtering [data-pipeline-layer].pipeline-node.is-match,
.pipeline-architecture.is-filtering [data-pipeline-layer].pipeline-block.is-match {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.4), 0 10px 22px rgba(15, 23, 42, 0.38);
}

.pipeline-architecture.is-filtering .pipeline-flow:not(.is-match) .flow-dot {
  opacity: 0;
}

.pipeline-flow {
  position: relative;
  width: 100%;
  min-width: 0;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(148, 163, 184, 0.12), rgba(148, 163, 184, 0.54));
  overflow: hidden;
}

.pipeline-flow-mini {
  height: 3px;
}

.flow-dot {
  position: absolute;
  left: -12px;
  top: 50%;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  transform: translateY(-50%);
  background: rgba(34, 211, 238, 0.96);
  box-shadow: 0 0 10px rgba(34, 211, 238, 0.7);
  opacity: 0;
}

.pipeline-architecture .flow-dot {
  opacity: 1;
  animation: flowPulse var(--flow-duration) linear infinite;
}

.pipeline-flow-horizontal .flow-dot {
  animation-delay: 0.1s;
}

.pipeline-flow-mini .flow-dot {
  width: 8px;
  height: 8px;
  animation-delay: 0.28s;
}

@keyframes flowPulse {
  0% {
    left: -12px;
  }
  100% {
    left: calc(100% + 12px);
  }
}

.theme-toggle {
  margin-left: 0.5rem;
  border: 1px solid var(--surface-border);
  background: transparent;
  color: var(--nav-link);
  border-radius: 0.65rem;
  padding: 0.35rem 0.7rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s ease;
}

.theme-toggle:hover,
.theme-toggle:focus {
  color: var(--nav-link-active);
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.15);
  outline: none;
}

@media (max-width: 991.98px) {
  .portfolio-main {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  #sideNav .navbar-collapse {
    margin-top: 0.8rem;
  }

  #sideNav .navbar-nav .nav-item .nav-link {
    padding: 0.55rem 0;
  }
}

@media (max-width: 767.98px) {
  .resume-section {
    padding: 1.35rem;
  }

  .project-grid,
  .timeline-grid,
  .certificate-grid {
    grid-template-columns: 1fr;
  }

  .list-icons {
    font-size: 2rem;
  }

  .list-icons .list-inline-item {
    width: 3.2rem;
    height: 3.2rem;
  }

  .pipeline-columns {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }

  .pipeline-flow-horizontal {
    width: 100%;
    height: 3px;
  }

  .pipeline-lane {
    grid-template-columns: 1fr;
    gap: 0.32rem;
  }

  .pipeline-flow-mini {
    height: 2px;
  }

  .pipeline-chip {
    font-size: 0.7rem;
    padding: 0.25rem 0.55rem;
  }
}