:root {
  --bg: #0a0e17;
  --bg-alt: #10141f;
  --card: #131a29;
  --card-border: #263050;
  --text: #e8ecf5;
  --text-muted: #8d99b8;
  --blue: #5b8def;
  --blue-bright: #7fa8ff;
  --blue-soft: #3a5fb8;
  --blue-dim: #2a3a66;
  --gray: #6b7794;
  --gray-soft: #4a5570;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(91, 141, 239, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 141, 239, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 0%, transparent 75%);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

a {
  color: var(--blue-bright);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ---------- Layout ---------- */

.layout {
  display: flex;
  align-items: flex-start;
}

.content {
  flex: 1;
  min-width: 0;
}

@media (max-width: 900px) {
  .layout {
    flex-direction: column;
  }
}

/* ---------- Hero (sticky sidebar) ---------- */

.hero {
  position: sticky;
  top: 0;
  flex: 0 0 40%;
  width: 40%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 40px;
  text-align: center;
  border-right: 1px solid var(--card-border);
  overflow: hidden;
  isolation: isolate;
}

@media (max-width: 900px) {
  .hero {
    position: relative;
    top: auto;
    flex: 1 1 auto;
    width: 100%;
    height: auto;
    min-height: 70vh;
    padding: 72px 24px;
    border-right: none;
    border-bottom: 1px solid var(--card-border);
  }
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

#particle-field {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
}

.mesh-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  will-change: transform;
}

.mesh-orb--1 {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, var(--blue) 0%, transparent 70%);
  top: -220px;
  left: -140px;
  opacity: 0.55;
  animation: drift-a 18s ease-in-out infinite;
}

.mesh-orb--2 {
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, var(--gray) 0%, transparent 70%);
  bottom: -160px;
  right: -100px;
  opacity: 0.45;
  animation: drift-b 22s ease-in-out infinite;
}

.mesh-orb--3 {
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, var(--blue-bright) 0%, transparent 70%);
  top: 45%;
  left: 50%;
  opacity: 0.32;
  animation: drift-c 26s ease-in-out infinite;
}

@keyframes drift-a {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.15); }
}

@keyframes drift-b {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-50px, -30px) scale(1.1); }
}

@keyframes drift-c {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-40px, 50px) scale(0.9); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 340px;
  will-change: transform, opacity;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-bright);
  margin: 0 0 24px;
  animation: fade-up 0.6s ease both;
}

.kicker::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue-bright);
  box-shadow: 0 0 12px 2px rgba(127, 168, 255, 0.7);
}

.avatar {
  display: block;
  width: 108px;
  height: 108px;
  border-radius: 50%;
  border: 3px solid var(--blue-soft);
  margin: 0 auto 24px;
  animation: pop-in 0.6s ease both, glow-pulse 3s ease-in-out 0.6s infinite;
}

@keyframes pop-in {
  from { opacity: 0; transform: scale(0.6) translateY(-10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(91, 141, 239, 0.4); }
  50% { box-shadow: 0 0 0 12px rgba(91, 141, 239, 0); }
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(1.9rem, 4.4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  word-break: break-word;
  background: linear-gradient(135deg, #ffffff 30%, var(--blue-bright) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: fade-up 0.6s ease 0.1s both;
}

.tagline {
  color: var(--text-muted);
  margin: 0 0 32px;
  font-size: clamp(0.98rem, 1.6vw, 1.1rem);
  max-width: 30ch;
  margin-left: auto;
  margin-right: auto;
  animation: fade-up 0.6s ease 0.2s both;
}

@media (max-width: 900px) {
  .hero h1 {
    font-size: clamp(2.6rem, 7vw, 3.6rem);
  }
  .tagline {
    font-size: clamp(1.05rem, 2.2vw, 1.25rem);
    max-width: 40ch;
  }
  .hero-content {
    max-width: 460px;
  }
}

.hero-links {
  animation: fade-up 0.6s ease 0.3s both;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-links a {
  position: relative;
  display: inline-block;
  padding: 12px 28px;
  border: 1px solid var(--blue-bright);
  border-radius: 999px;
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
  background: rgba(91, 141, 239, 0.1);
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.hero-links a span {
  position: relative;
  z-index: 1;
}

.hero-links a:hover {
  background: var(--blue-soft);
  text-decoration: none;
  border-color: var(--blue-bright);
  box-shadow: 0 8px 28px rgba(58, 95, 184, 0.5);
}

.scroll-cue {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 38px;
  border: 2px solid var(--gray-soft);
  border-radius: 12px;
  z-index: 2;
  opacity: 0.7;
}

.scroll-cue span {
  position: absolute;
  top: 6px;
  left: 50%;
  width: 4px;
  height: 8px;
  border-radius: 2px;
  background: var(--blue-bright);
  transform: translateX(-50%);
  animation: scroll-cue-move 1.8s ease-in-out infinite;
}

@keyframes scroll-cue-move {
  0% { opacity: 1; top: 6px; }
  70% { opacity: 0; top: 18px; }
  100% { opacity: 0; top: 6px; }
}

/* ---------- Filters ---------- */

.filters {
  position: sticky;
  top: 0;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--card-border);
  z-index: 10;
  padding: 14px 0;
}

.filters-inner {
  position: relative;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 0 32px;
}

.filter-indicator {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue-soft), var(--blue-dim));
  box-shadow: 0 4px 14px rgba(58, 95, 184, 0.45);
  z-index: 0;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.filter-btn {
  position: relative;
  z-index: 1;
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  padding: 7px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: color 0.25s ease, border-color 0.25s ease, transform 0.2s ease;
}

.filter-btn:hover {
  border-color: var(--blue);
  color: var(--text);
}

.filter-btn:active {
  transform: scale(0.96);
}

.filter-btn.active {
  color: #fff;
  border-color: transparent;
}

/* ---------- Sections ---------- */

main {
  display: block;
  padding: 0 32px;
}

.project-section {
  padding: 56px 0 20px;
  transition: opacity 0.25s ease;
}

.project-section h2 {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}

.section-index {
  font-size: 0.85rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--blue-bright);
  padding: 3px 10px;
  border: 1px solid var(--blue-dim);
  border-radius: 999px;
  background: rgba(91, 141, 239, 0.08);
}

/* ---------- Bento grid & cards ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 20px;
}

@media (min-width: 760px) {
  .grid {
    grid-template-columns: repeat(6, 1fr);
  }
  .card {
    grid-column: span 3;
  }
  .card[data-size="lg"] {
    grid-column: 1 / -1;
  }
}

.card {
  position: relative;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.01));
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-radius: 20px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow: hidden;
  transition: box-shadow 0.35s ease, border-color 0.35s ease;
  opacity: 0;
  transform: translateY(24px);
  transform-style: preserve-3d;
  will-change: transform;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(140deg, var(--blue-soft) 0%, rgba(91, 141, 239, 0.05) 35%, rgba(107, 119, 148, 0.35) 100%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0.6;
  transition: opacity 0.35s ease;
}

.card-glow {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%), rgba(127, 168, 255, 0.16), transparent 65%);
}

.card.in-view {
  animation: card-reveal 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes card-reveal {
  to { opacity: 1; transform: translateY(0); }
}

.card:hover {
  box-shadow: 0 20px 46px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(91, 141, 239, 0.2);
}

.card:hover::before {
  opacity: 1;
}

.card:hover .card-glow {
  opacity: 1;
}

.card:hover h3 a {
  text-decoration: underline;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex-grow: 1;
  position: relative;
  z-index: 1;
}

.card h3 {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.card[data-size="lg"] {
  padding: 34px;
}

.card[data-size="lg"] h3 {
  font-size: clamp(1.3rem, 2vw, 1.6rem);
}

.card[data-size="lg"] p {
  font-size: 1rem;
  max-width: 62ch;
}

.card-footer {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.badge {
  font-size: 0.75rem;
  color: var(--gray);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--card-border);
  padding: 4px 12px;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}

.card:hover .badge {
  background: rgba(91, 141, 239, 0.14);
  color: var(--text);
  border-color: var(--blue-dim);
}

.stars {
  font-size: 0.86rem;
  color: var(--blue-bright);
  font-weight: 700;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-variant-numeric: tabular-nums;
}

.stars::before {
  content: "\2605";
  display: inline-block;
  transition: transform 0.35s ease;
}

.card:hover .stars::before {
  transform: rotate(72deg) scale(1.2);
}

.project-section.hidden {
  display: none;
}

.card.hidden {
  display: none;
}

/* ---------- Footer ---------- */

footer {
  border-top: 1px solid var(--card-border);
  margin-top: 56px;
  padding: 36px 32px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  position: relative;
  z-index: 2;
}