:root {
  --bg: #0f1218;
  --bg-elev: #151a23;
  --panel: #1a202b;
  --panel-alt: #202734;
  --text: #e8edf5;
  --muted: #a2adbf;
  --line: #2b3445;
  --accent: #62d6ff;
  --accent-soft: rgba(98, 214, 255, 0.16);
  --mono: "Roboto Mono", monospace;
  --display: "Roboto", sans-serif;
  --sans: "Roboto", sans-serif;
  --radius: 14px;
  --shadow: 0 8px 26px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #0d1016 0, #111621 60%, #0f1218 100%);
  color: var(--text);
  font-family: var(--sans);
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(167, 178, 195, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(167, 178, 195, 0.08) 1px, transparent 1px);
  background-size: 34px 34px;
}

.bg-orb {
  display: none;
}

.container {
  width: min(1120px, calc(100% - 34px));
  margin: 0 auto;
}

.section {
  padding: 64px 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(15, 18, 24, 0.86);
}

.topbar-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  text-decoration: none;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-logo {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: #101620;
  object-fit: cover;
}

.nav {
  display: flex;
  gap: 14px;
  align-items: center;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.hero {
  padding-top: 82px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 18px;
}

.hero-main,
.hero-panel,
.skill-card,
.timeline-item,
.project-card,
.edu-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-main {
  padding: 30px;
}

.hero-panel {
  padding: 24px;
}

.kicker,
.section-kicker {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #8ebdd0;
}

h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero-role {
  margin: 8px 0 0;
  color: #b8c4d7;
  font-size: 1.05rem;
}

.hero-summary {
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.78;
}

.hero-summary strong {
  color: #d9f6ff;
}

.cta-row {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  min-height: 42px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #0d1218;
  background: var(--accent);
  border-color: #7de0ff;
  font-weight: 700;
}

.btn-ghost {
  color: var(--text);
  background: transparent;
  border-color: #3a4559;
}

.quick-info {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.info-chip {
  background: var(--panel-alt);
  border: 1px solid #323d50;
  border-radius: 10px;
  padding: 11px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chip-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8a9cb4;
}

.info-chip span:last-child {
  color: #dae3f2;
  font-size: 0.93rem;
}

.hero-panel h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.metric-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.metric {
  background: #1f2633;
  border: 1px solid #313d50;
  border-radius: 10px;
  padding: 14px;
  min-height: 88px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.metric-value {
  font-family: var(--display);
  font-size: 1.7rem;
  line-height: 1;
  color: var(--accent);
}

.metric-label {
  font-size: 0.83rem;
  color: #a5b0c3;
}

.panel-note {
  margin: 14px 0 0;
  color: #9ba8bc;
  line-height: 1.7;
}

.section-head h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.45rem, 3.4vw, 2rem);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.skills-board {
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 2px);
  background: linear-gradient(145deg, #171d28, #141b25);
  box-shadow: var(--shadow);
  padding: 20px;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 14px;
}

.skills-intro {
  border: 1px solid #2f3a4e;
  border-radius: 12px;
  background: #1b2330;
  padding: 18px;
}

.skills-intro h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.35rem, 3.1vw, 1.9rem);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.skills-summary {
  margin: 12px 0 0;
  color: #98a8bf;
  line-height: 1.72;
}

.skills-meta {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skills-meta-item {
  border: 1px solid rgba(98, 214, 255, 0.35);
  border-radius: 999px;
  padding: 6px 10px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #a8e6fb;
  background: rgba(98, 214, 255, 0.1);
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.skill-card {
  border: 1px solid #34425a;
  border-radius: 12px;
  background: linear-gradient(155deg, #1a2331, #171f2c);
  padding: 14px;
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(98, 214, 255, 0.85), transparent);
}

.skill-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid rgba(98, 214, 255, 0.35);
  background: rgba(98, 214, 255, 0.11);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: #a9e9ff;
}

.skill-card h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 0.98rem;
  text-transform: uppercase;
}

.skill-list {
  margin: 12px 0 0;
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.skill-list li {
  position: relative;
  padding-left: 14px;
  color: #9fb0c7;
  font-size: 0.9rem;
  line-height: 1.5;
}

.skill-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline {
  margin-top: 22px;
  position: relative;
  display: grid;
  gap: 10px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, rgba(98, 214, 255, 0.4), rgba(98, 214, 255, 0.05));
}

.timeline-item {
  margin-left: 44px;
  overflow: hidden;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(98, 214, 255, 0.14);
}

.timeline-head {
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  padding: 17px 18px;
  display: grid;
  gap: 8px;
  cursor: pointer;
}

.timeline-head-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.timeline-period {
  font-family: var(--mono);
  font-size: 0.73rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #8ebdd0;
}

.timeline-role {
  margin: 0;
  font-family: var(--display);
  font-size: 1.04rem;
  text-transform: uppercase;
}

.timeline-company {
  color: #c8d4e8;
  font-weight: 600;
}

.timeline-meta {
  color: #8e9cb3;
  font-size: 0.83rem;
}

.toggle-indicator {
  min-width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid #3a4a62;
  color: #b8c7dc;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  transition: transform 0.2s ease, color 0.2s ease;
}

.timeline-item.is-open .toggle-indicator {
  transform: rotate(45deg);
  color: var(--accent);
}

.timeline-body {
  display: none;
  padding: 0 18px 18px;
  border-top: 1px dashed #37445a;
}

.timeline-body h4 {
  margin: 13px 0 8px;
  font-family: var(--display);
  font-size: 0.92rem;
  text-transform: uppercase;
  color: #cad8ec;
}

.timeline-body ul {
  margin: 0;
  padding-left: 16px;
  color: #9fb0c7;
  line-height: 1.65;
}

.project-mini-grid {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.project-mini {
  border: 1px solid #354056;
  border-radius: 10px;
  background: #202735;
  padding: 10px;
}

.project-mini h5 {
  margin: 0;
  font-family: var(--display);
  font-size: 0.92rem;
  text-transform: uppercase;
}

.project-mini p {
  margin: 7px 0 0;
  color: #9eb1c8;
  line-height: 1.6;
  font-size: 0.9rem;
}

.project-mini .tech {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: #8ec7db;
}

.project-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.project-card {
  padding: 16px;
}

.project-card h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 1rem;
  text-transform: uppercase;
}

.project-company {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 0.73rem;
  color: #8bc2d6;
  text-transform: uppercase;
}

.project-card p {
  margin: 9px 0 0;
  color: #9db0c5;
  font-size: 0.91rem;
  line-height: 1.66;
}

.project-tech {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.55;
  color: #b9ecff;
  text-transform: uppercase;
}

.edu-card {
  margin-top: 18px;
  padding: 18px;
}

.edu-period {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: #8dbfd3;
  text-transform: uppercase;
}

.edu-card h3 {
  margin: 8px 0;
  font-family: var(--display);
  font-size: 1.1rem;
  text-transform: uppercase;
}

.edu-card p {
  margin: 0;
  color: #a7b5c9;
}

.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  background: #0f131b;
}

.footer-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: #95a3b8;
  font-family: var(--mono);
  font-size: 0.76rem;
  text-transform: uppercase;
}

#back-to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid #3a495f;
  background: #1a212d;
  color: #d5deed;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.2s ease;
}

#back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

@media (max-width: 1040px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .skills-board {
    grid-template-columns: 1fr;
  }

  .skill-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 760px) {
  .container {
    width: min(1120px, calc(100% - 24px));
  }

  .topbar-inner {
    min-height: 62px;
  }

  .nav {
    display: none;
  }

  .hero {
    padding-top: 56px;
  }

  .hero-main,
  .hero-panel {
    padding: 20px;
  }

  .quick-info,
  .metric-grid,
  .skill-grid,
  .project-grid {
    grid-template-columns: 1fr;
  }

  .skills-board,
  .skills-intro {
    padding: 16px;
  }

  .timeline::before {
    left: 12px;
  }

  .timeline-item {
    margin-left: 24px;
  }

  .timeline-item::before {
    left: -20px;
  }

  .footer-inner {
    min-height: auto;
    padding: 16px 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}