/* ?? Theme tokens ?? */
:root[data-theme="dark"] {
  --bg: #000000;
  --bg-section: #050508;
  --bg-card: #0a0a0f;
  --bg-card-hover: #0f0f18;
  --border: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.12);
  --text: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --blue: #1d4ed8;
  --blue-light: #2563eb;
  --blue-glow: rgba(37, 99, 235, 0.25);
  --blue-soft: rgba(29, 78, 216, 0.12);
  --placeholder-bg: #111118;
  --placeholder-border: rgba(37, 99, 235, 0.2);
  --header-bg: rgba(0, 0, 0, 0.85);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --logo-plate: #101018;
  --logo-plate-tint: rgba(255, 255, 255, 0.045);
  --logo-plate-border: rgba(255, 255, 255, 0.1);
  --logo-img-shadow: none;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-section: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --text: #09090b;
  --text-secondary: #3f3f46;
  --text-muted: #71717a;
  --blue: #1e40af;
  --blue-light: #1d4ed8;
  --blue-glow: rgba(29, 78, 216, 0.15);
  --blue-soft: rgba(29, 78, 216, 0.08);
  --placeholder-bg: #f1f5f9;
  --placeholder-border: rgba(29, 78, 216, 0.25);
  --header-bg: rgba(255, 255, 255, 0.9);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --logo-plate: #ffffff;
  --logo-plate-tint: rgba(0, 0, 0, 0.015);
  --logo-plate-border: rgba(0, 0, 0, 0.1);
  --logo-img-shadow: none;
}

:root {
  --font: "Inter", system-ui, sans-serif;
  --font-display: "Plus Jakarta Sans", system-ui, sans-serif;
  --radius: 12px;
  --radius-lg: 16px;
  --container: 1280px;
  --transition: 0.25s ease;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-light); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}

.text-blue { color: var(--blue-light); }

/* ?? Header ?? */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.nav a {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

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

.nav-btn {
  padding: 0.45rem 1rem !important;
  border: 1px solid var(--border-strong) !important;
  border-radius: 8px;
  color: var(--text) !important;
}

.nav-btn:hover {
  border-color: var(--blue-light) !important;
  background: var(--blue-soft);
  color: var(--blue-light) !important;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.theme-toggle:hover {
  border-color: var(--blue-light);
  color: var(--blue-light);
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
}

/* ?? Buttons ?? */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1.4rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: var(--blue);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--blue-glow);
}

.btn-outline {
  border: 1px solid var(--border-strong);
  color: var(--text);
}

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

/* ?? Hero ?? */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 0 4rem;
  background:
    radial-gradient(ellipse 80% 55% at 50% 0%, var(--blue-soft), transparent 65%),
    var(--bg);
  position: relative;
}

.hero-intro {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue-light);
  margin-bottom: 1rem;
}

.hero-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 7vw, 4.75rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin-bottom: 1.15rem;
}

.hero-lead {
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.typing-line {
  color: var(--blue-light);
  font-weight: 600;
}

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

@keyframes blink { 50% { opacity: 0; } }

.hero-btns {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}

.scroll-cue {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  margin-top: 3.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--transition), transform var(--transition);
}

.scroll-cue svg {
  animation: bob 1.8s ease-in-out infinite;
}

.scroll-cue:hover { color: var(--blue-light); }

@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ?? Sections ?? */
.section {
  padding: clamp(4rem, 8vw, 6rem) 0;
  --section-bg: var(--bg);
}

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

.section-head {
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.section-head p {
  color: var(--text-muted);
  font-size: 1rem;
}

/* ?? About ?? */
.about-section {
  border-top: 1px solid var(--border);
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.95fr) 1.15fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.about-photo {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--placeholder-bg);
  border: 1px solid var(--border);
  max-width: 480px;
}

.about-photo img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.about-copy .eyebrow {
  margin-bottom: 0.65rem;
}

.about-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.1rem;
}

.about-copy p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.7;
}

.about-copy strong { color: var(--text); }

.about-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 1.5rem;
  margin-top: 0.5rem;
}

.about-facts div {
  padding-top: 0.85rem;
  border-top: 1px solid var(--border);
}

.about-facts dt {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.about-facts dd {
  font-size: 0.9rem;
  color: var(--text);
}

/* ?? Timeline ?? */
/* Timeline */
.timeline-wrap {
  position: relative;
  max-width: 980px;
  margin: 0 auto;
}

.timeline-rail {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  transform: translateX(-50%);
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.timeline-progress {
  width: 100%;
  height: 0;
  background: linear-gradient(180deg, var(--blue-light), var(--blue) 70%, transparent);
  border-radius: 99px;
  box-shadow: 0 0 18px var(--blue-glow);
  transition: height 0.15s linear;
}

.timeline {
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
}

.tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 128px 1fr;
  align-items: start;
  gap: 0;
  padding-bottom: 2.4rem;
  z-index: 1;
}

.tl-item:last-child { padding-bottom: 0; }

.tl-logo-wrap {
  grid-column: 2;
  display: flex;
  justify-content: center;
  padding-top: 1rem;
  position: relative;
  z-index: 5;
}

.tl-item.left .tl-card { grid-column: 1; grid-row: 1; }
.tl-item.right .tl-card { grid-column: 3; grid-row: 1; }

.tl-pulse {
  position: absolute;
  width: 104px;
  height: 104px;
  border-radius: 24px;
  border: 2px solid var(--blue-light);
  opacity: 0;
  pointer-events: none;
  z-index: 4;
}

.tl-item.visible .tl-pulse {
  animation: pulse-ring 1.6s ease-out 0.15s 2;
}

@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.55; }
  100% { transform: scale(1.7); opacity: 0; }
}

/* Theme-aware plate; the opaque fill is what hides the rail behind the logo */
.tl-logo {
  width: 104px;
  height: 104px;
  border-radius: 24px;
  background: linear-gradient(var(--logo-plate-tint), var(--logo-plate-tint)), var(--logo-plate);
  border: 1px solid var(--logo-plate-border);
  display: grid;
  place-items: center;
  overflow: hidden;
  position: relative;
  z-index: 5;
  isolation: isolate;
  box-shadow: 0 0 0 12px var(--section-bg);
  transform: scale(0.92);
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1) var(--delay, 0s),
    border-color 0.3s ease,
    box-shadow 0.3s ease,
    background 0.25s ease;
}

.tl-item.visible .tl-logo {
  transform: scale(1);
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: 0 0 0 12px var(--section-bg), 0 0 22px var(--blue-glow);
}

/* Every logo image occupies the same grid cell so the light/dark pair overlap */
.tl-logo-img {
  grid-area: 1 / 1;
  width: 78px;
  height: 78px;
  object-fit: contain;
  object-position: center;
  background: transparent;
  filter: var(--logo-img-shadow);
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.45s ease var(--delay, 0s),
    transform 0.55s cubic-bezier(0.22, 1, 0.36, 1) var(--delay, 0s);
}

.tl-item.visible .tl-logo-img { opacity: 1; transform: scale(1); }

/* Show only the variant that suits the active theme */
[data-theme="light"] .tl-logo-img.is-dark,
[data-theme="dark"] .tl-logo-img.is-light { display: none; }

.tl-logo-fallback {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--blue-light);
  opacity: 0;
  transition: opacity 0.45s ease var(--delay, 0s);
}

.tl-item.visible .tl-logo-fallback {
  opacity: 1;
}

.tl-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.6rem;
  opacity: 0;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.tl-item.left .tl-card {
  margin-right: 1.5rem;
  transform: translateX(-36px);
}

.tl-item.right .tl-card {
  margin-left: 1.5rem;
  transform: translateX(36px);
}

.tl-item.visible .tl-card {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.6s ease var(--delay, 0s),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1) var(--delay, 0s),
    border-color var(--transition),
    box-shadow var(--transition);
}

.tl-item.visible .tl-card:hover {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.tl-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}

.tl-badge {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  background: var(--blue-soft);
  color: var(--blue-light);
}

.tl-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.tl-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.tl-org {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--blue-light);
  margin-bottom: 0.4rem;
}

.tl-location {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.tl-location svg { flex-shrink: 0; opacity: 0.6; }

.tl-bullets {
  list-style: none;
  padding: 0;
}

.tl-bullets li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  line-height: 1.55;
  opacity: 0;
  transform: translateY(8px);
}

.tl-item.visible .tl-bullets li {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.4s ease var(--li-delay, 0.2s), transform 0.4s ease var(--li-delay, 0.2s);
}

.tl-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue-light);
}

.tl-media {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.85rem;
  margin-top: 1rem;
}

.tl-media-item {
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg);
}

.tl-media-item a {
  display: block;
  aspect-ratio: 16/10;
  overflow: hidden;
  min-height: 160px;
}

.tl-media-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
  image-rendering: auto;
}

.tl-media-item:hover img {
  transform: scale(1.04);
}

.tl-media-item figcaption {
  padding: 0.45rem 0.6rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.project-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(16px);
}

.project-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease var(--delay, 0s), transform 0.5s ease var(--delay, 0s), border-color var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  color: var(--text);
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.project-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.55;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.project-tags span {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  background: var(--blue-soft);
  color: var(--blue-light);
  border-radius: 6px;
}

.project-highlight {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--blue-light);
}

.project-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* ?? Skills ?? */
.skills-wrap {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.skill-block h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

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

.pills span {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.pills span:hover {
  border-color: var(--blue-light);
  color: var(--blue-light);
  background: var(--blue-soft);
}

/* ?? Contact ?? */
.contact-panel {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
  padding: clamp(2rem, 4vw, 3rem);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.contact-text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.contact-text p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.contact-card {
  padding: 1rem 1.15rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--blue-light);
  transform: translateY(-2px);
  color: var(--text);
}

.contact-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.contact-card span:last-child {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ?? Footer ?? */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ?? Reveal ?? */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ?? Responsive ?? */
@media (max-width: 1024px) {
  .about-layout { grid-template-columns: 1fr; }
  .about-photo { max-width: 420px; margin: 0 auto; }
  .skills-wrap { grid-template-columns: 1fr; }

  .timeline-rail { left: 52px; transform: none; z-index: 0; }
  .tl-item {
    grid-template-columns: 104px 1fr;
    gap: 1.25rem;
  }
  .tl-logo-wrap { grid-column: 1; }
  .tl-item.left .tl-card,
  .tl-item.right .tl-card {
    grid-column: 2;
    grid-row: 1;
    margin: 0;
    transform: translateX(28px);
  }
  .tl-item.visible.left .tl-card,
  .tl-item.visible.right .tl-card {
    transform: translateX(0);
  }
}

@media (max-width: 900px) {
  .hero-btns { justify-content: center; }
  .contact-panel { grid-template-columns: 1fr; }
  .about-facts { grid-template-columns: 1fr; }

  .menu-toggle { display: flex; }

  .nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1.5rem;
    gap: 0;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

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

  .nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border);
  }

  .nav a:last-child { border-bottom: none; }
}

@media (max-width: 600px) {
  .contact-cards { grid-template-columns: 1fr; }
  .tl-item { grid-template-columns: 88px 1fr; gap: 1rem; }
  .tl-logo { width: 84px; height: 84px; border-radius: 20px; box-shadow: 0 0 0 10px var(--section-bg); }
  .tl-item.visible .tl-logo { box-shadow: 0 0 0 10px var(--section-bg), 0 0 18px var(--blue-glow); }
  .tl-logo-img { width: 62px; height: 62px; }
  .tl-pulse { width: 84px; height: 84px; border-radius: 20px; }
  .timeline-rail { left: 44px; }
}