/* ── VARIABLES ── */
:root {
  --bg: #FFEBE7;
  --surface: rgba(255, 255, 255, 0.6);
  --surface-solid: #FFFFFF;
  --border: rgba(255, 192, 190, 0.9);
  --border-accent: rgba(255, 130, 169, 0.35);
  --accent: #FF82A9;
  --accent2: #7F95D1;
  --accent3: #4A4548;
  --accent-glow: rgba(255, 130, 169, 0.18);
  --text: #000000;
  --muted: #4A4548;
  --tag-bg: rgba(255, 130, 169, 0.13);
  --tag-color: #4A5FA0;
  --radius: 16px;
}

/* ── RESET ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

/* ── SCREEN-READER ONLY ── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* Custom cursor only on real pointer devices; preserves accessibility on touch/keyboard */
@media (hover: hover) and (pointer: fine) {
  *, *::before, *::after { cursor: none !important; }
}
@media not ((hover: hover) and (pointer: fine)) {
  #cursor-dot { display: none !important; }
}

/* ── FOCUS RING ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── CURSOR ── */
#cursor-dot {
  position: fixed; z-index: 9999;
  width: 7px; height: 7px; border-radius: 50%;
  background: #fff;
  transform: translate(-50%, -50%);
  pointer-events: none;
  mix-blend-mode: difference;
}

/* ── BACKGROUND CANVAS ── */
#bg-canvas {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: transparent; border-bottom: none;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 60px;
  transition: background 0.4s, backdrop-filter 0.4s;
}
nav.scrolled {
  background: rgba(255, 235, 231, 0.65);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.nav-logo {
  font-size: 1.1rem; font-weight: 700;
  background: var(--accent);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  position: relative; color: var(--muted); text-decoration: none;
  font-size: 0.88rem; transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
  height: 1px; background: var(--accent);
  transform: scaleX(0); transform-origin: left; transition: transform 0.25s;
}
.nav-links a:hover::after { transform: scaleX(1); }

/* ── HAMBURGER ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px 4px;
  cursor: pointer !important;
  z-index: 101;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── MAIN LAYOUT ── */
main { position: relative; z-index: 1; }

/* ── BENTO GRID ── */
/* 16 narrow tracks instead of 4 wide ones. Every tile from row 3 down
   still spans a multiple of 4 tracks, so their widths are unchanged;
   the finer grid exists purely so the chat can take 6 tracks instead of
   4, with hero and info absorbing the difference. */
.bento {
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 1.5rem 4rem;
}

/* ── TILE BASE ── */
.tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: relative;
  z-index: 1;
  transition: border-color 0.25s, transform 0.25s;
}

/* ── GRID PLACEMENT (desktop, 16 tracks) ── */
.tile-hero    { grid-column:  1 / 11; grid-row: 1; }
.tile-info    { grid-column:  1 / 11; grid-row: 2; }
.tile-chat    { grid-column: 11 / 17; grid-row: 1 / 3; }
.tile-rag     { grid-column:  1 /  9; grid-row: 3 / 5; }
.tile-lette   { grid-column:  9 / 17; grid-row: 3; }
.tile-llm     { grid-column:  9 / 17; grid-row: 4; }
.tile-skills  { grid-column:  1 / 17; grid-row: 5; }
.tile-edu     { grid-column:  1 /  9; grid-row: 6; }
.tile-cert    { grid-column:  9 / 13; grid-row: 6; }
.tile-ach     { grid-column: 13 / 17; grid-row: 6; }
.tile-contact { grid-column:  1 / 17; grid-row: 7; }

/* ── HERO TILE ── */
.tile-hero {
  display: flex; flex-direction: column; justify-content: center; gap: 0.85rem;
  background: rgba(255, 255, 255, 0.55);
}
.hero-badge {
  display: inline-block; width: fit-content;
  padding: 0.3rem 0.9rem; border-radius: 99px;
  background: rgba(255, 130, 169,0.14); border: 1px solid rgba(255, 130, 169,0.38);
  color: #C43F6E; font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
}
.tile-hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.2rem); font-weight: 800; line-height: 1.1;
  background: linear-gradient(135deg, #000000 0%, #000000 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle { font-size: 1rem; color: var(--muted); font-weight: 500; }
.hero-bio { font-size: 0.9rem; color: var(--muted); line-height: 1.75; max-width: 560px; }
.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 0.25rem; }

/* ── INFO TILE ── */
.tile-info {
  display: flex; flex-direction: column; justify-content: space-between; gap: 1rem;
}
.info-status {
  display: inline-block; width: fit-content;
  padding: 0.3rem 0.85rem; border-radius: 99px;
  background: rgba(16, 140, 100,0.14); border: 1px solid rgba(16, 140, 100,0.3);
  color: #0E7A55; font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em;
}
.info-links { display: flex; flex-direction: column; gap: 0.7rem; flex: 1; }
.info-link {
  display: flex; align-items: center; gap: 0.55rem;
  color: var(--muted); text-decoration: none; font-size: 0.82rem;
  transition: color 0.2s; overflow: hidden;
}
.info-link span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.info-link:hover { color: var(--accent); }
.info-link svg { flex-shrink: 0; }
.info-loc { cursor: default !important; }
.info-footer {
  font-size: 0.73rem; color: var(--muted);
  border-top: 1px solid var(--border); padding-top: 0.75rem;
  letter-spacing: 0.02em;
}

/* ── RAG TILE (large, star project) ── */
.tile-rag {
  display: flex; flex-direction: column; gap: 1rem;
  background: linear-gradient(145deg, rgba(127, 149, 209,0.12) 0%, var(--surface) 55%);
  border-color: rgba(127, 149, 209,0.45);
}
.tile-rag:hover { border-color: rgba(127, 149, 209,0.75); transform: translateY(-3px); }
.tile-rag .project-desc { flex: 1; }

/* ── PROJECT TILES ── */
.tile-lette { display: flex; flex-direction: column; gap: 1rem; }
.tile-lette:hover, .tile-llm:hover { border-color: var(--border-accent); transform: translateY(-2px); }

/* ── METRICS ROW ── */
.project-metrics {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-top: 0.85rem; padding-top: 0.85rem;
  border-top: 1px solid var(--border);
}
.metric-item {
  display: flex; flex-direction: column; align-items: center;
  background: rgba(255, 130, 169,0.07); border: 1px solid rgba(255, 130, 169,0.2);
  border-radius: 8px; padding: 0.4rem 0.8rem; min-width: 58px;
}
.metric-val { font-size: 1rem; font-weight: 700; color: var(--accent); line-height: 1.2; }
.metric-label { font-size: 0.62rem; color: var(--muted); text-align: center; margin-top: 0.1rem; white-space: nowrap; }

.project-title {
  font-size: 1.1rem; font-weight: 700; margin: 0.4rem 0 0.2rem;
}
.tile-rag .project-title { font-size: 1.3rem; }

.project-sub { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.6rem; }

.project-desc {
  color: var(--muted); font-size: 0.87rem; line-height: 1.72;
  padding-left: 1.1rem; margin-bottom: 0.9rem;
}
.project-desc li { margin-bottom: 0.35rem; }

.project-badge {
  display: inline-block; font-size: 0.7rem; font-weight: 600;
  padding: 0.22rem 0.7rem; border-radius: 99px; white-space: nowrap;
}
.badge-winner     { background: rgba(200, 140, 20,0.14); color: #9A6400; border: 1px solid rgba(200, 140, 20,0.3); }
.badge-dissertation { background: rgba(127, 149, 209,0.14); color: #4A5FA0; border: 1px solid rgba(127, 149, 209,0.3); }
.badge-personal   { background: rgba(16, 140, 100,0.14); color: #0E7A55; border: 1px solid rgba(16, 140, 100,0.3); }

.project-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  color: var(--accent); font-size: 0.82rem; text-decoration: none;
  margin-top: auto; padding-top: 0.5rem;
}
.project-link:hover { text-decoration: underline; }
.project-links-row { display: flex; gap: 1.25rem; flex-wrap: wrap; margin-top: auto; padding-top: 0.5rem; }
.project-links-row .project-link { margin-top: 0; padding-top: 0; }
.project-link-li { color: #1E66C9; }
.project-link-li:hover { color: #174EA0; }

/* ── TAGS ── */
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-size: 0.7rem; padding: 0.2rem 0.6rem; border-radius: 5px;
  background: var(--tag-bg); color: var(--tag-color);
  border: 1px solid rgba(255, 130, 169,0.2);
}

/* ── TILE LABEL (section heading inside tile) ── */
.tile-label {
  display: block; font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  background: var(--accent);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 1rem;
}

/* ── SKILLS TILE ── */
.tile-skills { }
.skills-grid { display: flex; flex-direction: column; gap: 0.55rem; }
.skill-row {
  display: grid; grid-template-columns: 120px 1fr; align-items: flex-start; gap: 0.75rem;
}
.skill-cat { font-size: 0.75rem; font-weight: 600; color: var(--accent); padding-top: 0.15rem; }

/* ── EDUCATION TILE ── */
.edu-list { display: flex; flex-direction: column; gap: 1rem; }
.edu-item { padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
.edu-item:last-child { border-bottom: none; padding-bottom: 0; }
.edu-top {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 0.75rem; margin-bottom: 0.4rem;
}
.edu-degree { font-weight: 700; font-size: 0.92rem; }
.edu-school { color: var(--muted); font-size: 0.8rem; margin-top: 0.15rem; }
.edu-date { font-size: 0.76rem; color: var(--muted); white-space: nowrap; }
.edu-detail { font-size: 0.82rem; color: var(--muted); line-height: 1.65; }

/* ── CERT TILE ── */
.cert-list { display: flex; flex-direction: column; gap: 0.65rem; }
.cert-item {
  padding: 0.7rem 0.85rem;
  background: rgba(24, 32, 46,0.03); border-radius: 9px;
  border: 1px solid var(--border);
}
.cert-name { font-size: 0.85rem; font-weight: 600; margin-bottom: 0.2rem; }
.cert-meta { font-size: 0.76rem; color: var(--muted); }

/* ── ACHIEVEMENT TILE ── */
.ach-list { display: flex; flex-direction: column; gap: 0.75rem; }
.ach-item { display: flex; gap: 0.7rem; align-items: flex-start; }
.ach-icon { font-size: 1.15rem; flex-shrink: 0; margin-top: 0.05rem; }
.ach-title { font-size: 0.87rem; font-weight: 600; margin-bottom: 0.15rem; }
.ach-desc { font-size: 0.78rem; color: var(--muted); }

/* ── CONTACT TILE ── */
.tile-contact {
  background: linear-gradient(135deg, rgba(255, 130, 169,0.08) 0%, var(--surface) 60%);
}
.contact-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 2rem; flex-wrap: wrap;
}
.contact-title { font-size: 1.6rem; font-weight: 700; margin-bottom: 0.35rem; }
.contact-sub { font-size: 0.88rem; color: var(--muted); max-width: 360px; }
.contact-ctas { display: flex; gap: 0.75rem; flex-wrap: wrap; flex-shrink: 0; }

/* ── BUTTONS ── */
.btn {
  padding: 0.65rem 1.4rem; border-radius: 8px; font-size: 0.88rem; font-weight: 600;
  text-decoration: none; transition: all 0.2s; display: inline-flex;
  align-items: center; gap: 0.5rem; border: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff; box-shadow: 0 4px 20px rgba(255, 130, 169,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(127, 149, 209,0.45); }
.btn-outline {
  background: transparent; color: var(--text);
  border: 1px solid rgba(255, 130, 169,0.35);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }

/* ── FOOTER ── */
footer {
  position: relative; z-index: 1; text-align: center;
  padding: 2rem; color: var(--muted); font-size: 0.82rem;
  border-top: 1px solid var(--border);
}
footer a { color: var(--accent); text-decoration: none; }

/* ── SCROLL FADE ── */
.fade-in { opacity: 0; transform: translateY(18px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE: tablet ── */
@media (max-width: 900px) {
  .bento { grid-template-columns: repeat(2, 1fr); }

  .tile-hero    { grid-column: 1 / -1; grid-row: 1; }
  .tile-chat    { grid-column: 1 / -1; grid-row: 2; }
  .tile-info    { grid-column: 1 / -1; grid-row: 3; }
  .tile-rag     { grid-column: 1 / -1; grid-row: 4; }
  .tile-lette   { grid-column: 1 / -1; grid-row: 5; }
  .tile-llm     { grid-column: 1 / -1; grid-row: 6; }
  .tile-skills  { grid-column: 1 / -1; grid-row: 7; }
  .tile-edu     { grid-column: 1 / -1; grid-row: 8; }
  .tile-cert    { grid-column: 1 / 2;  grid-row: 9; }
  .tile-ach     { grid-column: 2 / 3;  grid-row: 9; }
  .tile-contact { grid-column: 1 / -1; grid-row: 10; }
}

/* ── RESPONSIVE: mobile ── */
@media (max-width: 560px) {
  .bento {
    grid-template-columns: 1fr;
    padding: 72px 1rem 3rem;
    gap: 0.75rem;
  }
  /* rows 1–8 are inherited from the tablet block */
  .tile-cert    { grid-column: 1 / -1; grid-row: 9; }
  .tile-ach     { grid-column: 1 / -1; grid-row: 10; }
  .tile-contact { grid-column: 1 / -1; grid-row: 11; }
  .skill-row { grid-template-columns: 1fr; }
  .edu-top { flex-direction: column; }
  .contact-inner { flex-direction: column; align-items: flex-start; }

  /* Hide inline nav links, show hamburger */
  nav .nav-links {
    display: none;
    position: fixed;
    top: 60px; left: 0; right: 0;
    background: rgba(255, 235, 231, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--border);
    z-index: 99;
  }
  nav .nav-links.open { display: flex; }
  nav .nav-links a { font-size: 1rem; }
  .nav-hamburger { display: flex; }
}

/* cream + raspberry + mint */
.tag { background: rgba(127,149,209,0.32); color: #4A5FA0; border-color: rgba(127,149,209,0.55); }
.skill-cat { color: #4A4548; }
.badge-winner { background: rgba(255,130,169,0.1); color: #C43F6E; border-color: rgba(255,130,169,0.35); }
.badge-dissertation { background: rgba(127,149,209,0.4); color: #4A5FA0; border-color: rgba(127,149,209,0.7); }
.badge-personal { background: rgba(0,0,0,0.08); color: #4A4548; border-color: rgba(0,0,0,0.25); }
.tile-rag { background: linear-gradient(145deg, rgba(127,149,209,0.28) 0%, var(--surface) 55%); border-color: rgba(127,149,209,0.7); }
.metric-item { background: rgba(255,130,169,0.05); border-color: rgba(255,130,169,0.2); }
.metric-val { color: #FF82A9; }
.btn-outline { border-color: rgba(0,0,0,0.3); }
.btn-outline:hover { border-color: #FF82A9; color: #C43F6E; background: rgba(255,130,169,0.06); }
.project-link-li { color: #4A4548; }

/* ── 3D: knowledge graph in the page background ── */
#bg-graph {
  position: fixed; inset: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}

/* ── 3D: tilt on project tiles ── */
.tile-rag, .tile-lette, .tile-llm { transform-style: preserve-3d; will-change: transform; }
.tile.tilting { transition: transform 0.08s linear, border-color 0.25s; }

/* pink + periwinkle + black */
.btn-primary { background: #000; color: #fff; box-shadow: 0 4px 18px rgba(255,130,169,0.45); }
.btn-primary:hover { background: #FF82A9; color: #000; box-shadow: 0 8px 26px rgba(255,130,169,0.55); }
.btn-outline { border-color: rgba(0,0,0,0.25); }
.btn-outline:hover { border-color: #7F95D1; color: #4A5FA0; background: rgba(127,149,209,0.1); }
.nav-logo, .tile-label { background: #C43F6E; -webkit-background-clip: text; background-clip: text; }
.project-link, footer a, .info-link:hover { color: #C43F6E; }
.project-link-li { color: #4A5FA0; }
.metric-val { color: #C43F6E; }
.hero-badge { background: rgba(255,130,169,0.18); border-color: rgba(255,130,169,0.55); color: #B3365F; }
.badge-winner { background: rgba(255,130,169,0.18); color: #B3365F; border-color: rgba(255,130,169,0.5); }
.skill-cat { color: #000; }
/* C: black background */
:root { --bg: #000; --text: #FFEBE7; --muted: #E9C9C6; --border: rgba(255,192,190,0.22); --surface: rgba(255,235,231,0.05); }
body { background: #000; }
nav.scrolled { background: rgba(0,0,0,0.7); }
.tile, .tile-hero, .tile-contact { background: rgba(255,235,231,0.05); }
.tile-hero h1 { background: none; -webkit-text-fill-color: #FFEBE7; color: #FFEBE7; }
.btn-primary { background: #FF82A9; color: #000; box-shadow: 0 0 24px rgba(255,130,169,0.55); }
.btn-primary:hover { background: #7F95D1; color: #000; box-shadow: 0 0 28px rgba(127,149,209,0.6); }
.btn-outline { color: #FFEBE7; border-color: rgba(255,192,190,0.4); }
.btn-outline:hover { color: #000; background: #FFC0BE; border-color: #FFC0BE; }
.nav-logo, .tile-label { background: #FF82A9; -webkit-background-clip: text; background-clip: text; }
.nav-links a { color: #E9C9C6; }
.tag { background: rgba(127,149,209,0.16); color: #B9C6EC; border-color: rgba(127,149,209,0.4); }
.tile-rag { background: linear-gradient(145deg, rgba(127,149,209,0.16) 0%, rgba(255,235,231,0.04) 60%); border-color: rgba(127,149,209,0.5); }
.hero-badge, .badge-winner { background: rgba(255,130,169,0.15); color: #FF9FBD; border-color: rgba(255,130,169,0.45); }
.badge-dissertation, .badge-personal { background: rgba(127,149,209,0.16); color: #B9C6EC; border-color: rgba(127,149,209,0.45); }
.metric-item, .cert-item { background: rgba(255,235,231,0.04); border-color: rgba(255,192,190,0.2); }
.metric-val, .project-link, footer a, .info-link:hover { color: #FF9FBD; }
.project-link-li, .skill-cat { color: #B9C6EC; }
@media (max-width: 560px) {
  nav .nav-links { background: rgba(0, 0, 0, 0.96); border-bottom-color: rgba(255, 192, 190, 0.22); }
  nav .nav-links a { color: #FFEBE7; }
}
.nav-hamburger span { background: #FFEBE7; }