@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700;800&family=Lato:ital,wght@0,300;0,400;0,700;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ===== VARIABLES ===== */
:root {
  --navy:        #090f1e;
  --navy-mid:    #0d1a2e;
  --navy-card:   rgba(12, 24, 44, 0.92);
  --teal:        #00b4d8;
  --teal-light:  #48cae4;
  --teal-dark:   #0077b6;
  --accent:      #00f5d4;
  --gold:        #f0a500;
  --red-elem:    #e05555;
  --text-prim:   #dff0f7;
  --text-sec:    #90b8cc;
  --text-muted:  #5a7d92;
  --white:       #ffffff;
  --border:      rgba(0, 180, 216, 0.22);
  --shadow:      0 12px 40px rgba(0,0,0,0.55);
  --glow:        0 0 30px rgba(0, 180, 216, 0.22);
  --font-h:      'Montserrat', sans-serif;
  --font-b:      'Lato', sans-serif;
  --font-m:      'JetBrains Mono', monospace;
  --ease:        cubic-bezier(.4,0,.2,1);
  --t:           0.32s;
  --r:           12px;
  --r-sm:        6px;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-b);
  background: var(--navy);
  color: var(--text-prim);
  line-height: 1.75;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: var(--teal); text-decoration: none; transition: color var(--t) var(--ease); }
a:hover { color: var(--teal-light); }
strong { color: var(--teal-light); }
ul, ol { list-style: none; }

h1,h2,h3,h4,h5 { font-family: var(--font-h); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.6rem); }
p  { margin-bottom: 1rem; }

/* ===== LAYOUT ===== */
.container { max-width: 1180px; margin: 0 auto; padding: 0 2rem; }
.section   { padding: 88px 0; }
.two-col   { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; }
.three-col { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; }

/* ===== SECTION HEADER ===== */
.section-header { text-align: center; margin-bottom: 56px; }
.section-label  {
  display: inline-block;
  background: rgba(0,180,216,.1);
  border: 1px solid rgba(0,180,216,.3);
  color: var(--teal);
  padding: .3rem 1.1rem;
  border-radius: 100px;
  font-family: var(--font-h);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.section-title {
  color: var(--white);
  margin-bottom: .75rem;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  width: 52px;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), var(--accent));
  margin: .65rem auto 0;
  border-radius: 2px;
}
.section-sub { color: var(--text-sec); font-size: 1.05rem; max-width: 580px; margin: 0 auto; }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 999;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--t) var(--ease),
              border-color var(--t) var(--ease),
              box-shadow var(--t) var(--ease);
}
.navbar.scrolled {
  background: rgba(9,15,30,.97);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom-color: rgba(255,255,255,.07);
  box-shadow: 0 2px 40px rgba(0,0,0,.45);
}

/* Three-column grid: logo | nav-center | social-right */
.nav-container {
  max-width: 1320px; width: 100%; margin: 0 auto;
  padding: 0 32px; height: 78px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

/* ── Logo (left column) ── */
.nav-logo {
  grid-column: 1; justify-self: start;
  font-family: var(--font-h); font-weight: 800; font-size: 1.08rem;
  color: var(--white); letter-spacing: -.01em;
  text-decoration: none;
  transition: opacity var(--t) var(--ease);
}
.nav-logo:hover { opacity: .78; color: var(--white); }
.nav-logo span  { color: var(--teal); }

/* ── Nav links (center column) ── */
.nav-menu {
  grid-column: 2;
  display: flex; align-items: center; gap: 36px;
  list-style: none; margin: 0; padding: 0;
}
.nav-link {
  color: var(--text-sec);
  font-family: var(--font-h); font-weight: 600; font-size: .875rem;
  letter-spacing: .04em; text-transform: uppercase;
  padding: 6px 0; position: relative;
  transition: color .25s var(--ease); white-space: nowrap;
  text-decoration: none;
}
.nav-link::after {
  content: ''; position: absolute; bottom: -1px; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--teal), var(--accent));
  border-radius: 1px; transform: scaleX(0);
  transition: transform .25s var(--ease);
}
.nav-link:hover          { color: var(--white); }
.nav-link:hover::after   { transform: scaleX(1); }
.nav-link.active {
  color: var(--teal);
  background: rgba(0,180,216,.12);
  border: 1px solid rgba(0,180,216,.20);
  border-radius: 10px;
  padding: 6px 14px;
}
.nav-link.active::after  { display: none; }

/* ── Hamburger (hidden desktop, right column on mobile) ── */
.nav-toggle {
  display: none;
  grid-column: 3; justify-self: end;
  flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 8px; border-radius: var(--r-sm);
  transition: background var(--t) var(--ease);
}
.nav-toggle:hover { background: rgba(255,255,255,.08); }
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text-prim); border-radius: 2px;
  transition: all var(--t) var(--ease);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Social icons panel (right column, desktop only) ── */
.nav-right {
  grid-column: 3; justify-self: end;
  display: flex; align-items: center; gap: 4px;
  padding-left: 20px;
  position: relative;
}
.nav-right::before {
  content: '';
  position: absolute; left: 0; top: 50%;
  transform: translateY(-50%);
  width: 1px; height: 28px;
  background: rgba(255,255,255,.13);
}

/* Social icon button */
.nav-soc {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 8px;
  color: var(--text-muted); position: relative; flex-shrink: 0;
  transition: color .25s var(--ease), background .25s var(--ease), transform .25s var(--ease);
  text-decoration: none;
}
.nav-soc svg { width: 18px; height: 18px; flex-shrink: 0; }
.nav-soc:hover {
  color: var(--teal); background: rgba(0,180,216,.10);
  transform: translateY(-2px);
}
/* Tooltip */
.nav-soc::after {
  content: attr(data-tip);
  position: absolute; bottom: -30px; left: 50%;
  transform: translateX(-50%);
  background: rgba(9,15,30,.95); color: var(--white);
  font-size: .65rem; font-family: var(--font-h); font-weight: 700;
  padding: 3px 8px; border-radius: 4px;
  white-space: nowrap; opacity: 0; pointer-events: none;
  transition: opacity .18s; letter-spacing: .5px; text-transform: uppercase;
  z-index: 20; border: 1px solid var(--border);
}
.nav-soc:hover::after { opacity: 1; }

/* Mobile-only social row inside <ul> — hidden on desktop */
.nav-soc-mob  { display: none; }
/* Legacy class — no-op on desktop */
.nav-soc-item { display: none; }

/* ===== HERO ===== */
.hero {
  position: relative;
  height: 100vh; min-height: 620px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.hero-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%; z-index: 0;
}
.hero-content {
  position: relative; z-index: 2;
  display: flex; flex-direction: column; align-items: center;
  gap: 2rem; padding: 6rem 2rem 2rem; text-align: center;
}

/* Split-screen image */
.hero-img-wrap {
  position: relative;
  width: 320px; height: 320px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid rgba(0,180,216,.5);
  box-shadow: 0 0 70px rgba(0,180,216,.28), 0 0 140px rgba(0,180,216,.1), var(--shadow);
  flex-shrink: 0;
  animation: glowPulse 4s ease-in-out infinite;
}
.hero-photo {
  width: 100%; height: 100%;
  object-fit: cover; object-position: center top;
}
.hero-split {
  position: absolute; top: 0; width: 50%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .4s var(--ease);
  z-index: 5;
}
.hero-split.left {
  left: 0;
  background: linear-gradient(135deg, rgba(0,77,182,.82), rgba(0,180,216,.78));
  border-radius: 50% 0 0 50%;
}
.hero-split.right {
  right: 0;
  background: linear-gradient(225deg, rgba(0,119,182,.82), rgba(0,245,212,.75));
  border-radius: 0 50% 50% 0;
}
.hero-img-wrap:hover .hero-split { opacity: 1; }
.split-inner {
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  padding: 1rem;
  transform: translateY(8px);
  transition: transform .35s var(--ease);
}
.hero-split:hover .split-inner { transform: translateY(0); }
.split-icon  { font-style: normal; font-size: 1.8rem; }
.split-label {
  font-family: var(--font-h); font-weight: 800; font-size: .95rem;
  color: var(--white); letter-spacing: 1px; text-transform: uppercase;
}
.split-desc { font-size: .72rem; color: rgba(255,255,255,.88); text-align: center; line-height: 1.4; }

/* Hero text */
.hero-text { max-width: 680px; }
.hero-name {
  font-size: clamp(2.2rem,5.5vw,3.8rem); font-weight: 800;
  color: var(--white); margin-bottom: .4rem;
  text-shadow: 0 2px 20px rgba(0,0,0,.5);
}
.hero-name .hi { color: var(--teal); }
.hero-tagline {
  font-size: clamp(.95rem,2vw,1.2rem); color: var(--text-sec);
  font-weight: 300; letter-spacing: .4px; margin-bottom: .75rem;
}
.hero-tags {
  display: flex; gap: .6rem; justify-content: center;
  flex-wrap: wrap; margin-bottom: 1.5rem;
}
.h-tag {
  background: rgba(0,180,216,.1);
  border: 1px solid rgba(0,180,216,.3);
  color: var(--teal-light);
  padding: .28rem .9rem; border-radius: 100px;
  font-size: .75rem; font-family: var(--font-h); font-weight: 600; letter-spacing: .4px;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* Scroll indicator */
.scroll-ind {
  position: absolute; bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  color: var(--text-muted); font-size: .72rem; font-family: var(--font-h);
  letter-spacing: 1px; text-transform: uppercase;
  cursor: pointer; animation: scrollBounce 2.2s infinite;
  z-index: 3;
}
.scroll-arrow {
  width: 18px; height: 18px;
  border-right: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: rotate(45deg);
}

/* ===== PAGE HERO ===== */
.page-hero {
  padding: 140px 0 72px;
  text-align: center;
  background: linear-gradient(180deg, rgba(0,180,216,.05) 0%, transparent 100%);
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0,180,216,.07) 0%, transparent 65%);
  pointer-events: none;
}
.page-hero-title { color: var(--white); margin: 1rem 0; }
.page-hero-desc  { color: var(--text-sec); font-size: 1.05rem; max-width: 620px; margin: 0 auto; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .85rem 1.9rem; border-radius: 100px;
  font-family: var(--font-h); font-weight: 700; font-size: .875rem;
  letter-spacing: .5px; transition: all var(--t) var(--ease);
  cursor: pointer; border: 2px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  color: var(--white);
  box-shadow: 0 4px 22px rgba(0,180,216,.38);
  border-color: transparent;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,180,216,.55);
  color: var(--white);
}
.btn-outline {
  background: transparent; color: var(--teal);
  border-color: var(--teal);
}
.btn-outline:hover {
  background: var(--teal); color: var(--navy);
  transform: translateY(-2px);
}
.btn-sm { padding: .5rem 1.2rem; font-size: .8rem; }

/* ===== CARDS ===== */
.card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 2rem;
  transition: all var(--t) var(--ease);
  position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--teal), var(--accent));
  opacity: 0; transition: opacity var(--t) var(--ease);
}
.card:hover {
  border-color: rgba(0,180,216,.48);
  transform: translateY(-4px);
  box-shadow: var(--glow), var(--shadow);
}
.card:hover::before { opacity: 1; }

/* ===== METRIC CARDS ===== */
.metrics-row { display: grid; grid-template-columns: repeat(5,1fr); gap: 1.25rem; }
.metric-card { text-align: center; padding: 2rem 1rem; }
.metric-num {
  font-family: var(--font-h); font-size: 2.8rem; font-weight: 800;
  color: var(--teal); line-height: 1; margin-bottom: .4rem;
}
.metric-lbl { color: var(--text-sec); font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .6px; }

/* ===== HIGHLIGHT LIST ===== */
.hl-list { display: flex; flex-direction: column; gap: .65rem; }
.hl-list li {
  display: flex; gap: .75rem; align-items: flex-start;
  padding: .8rem 1rem;
  background: rgba(0,180,216,.04);
  border-radius: var(--r-sm);
  border-left: 3px solid var(--teal);
  color: var(--text-sec); font-size: .95rem;
}
.hl-list li::before { content: '◆'; color: var(--teal); font-size: .55rem; margin-top: .45rem; flex-shrink: 0; }

/* ===== SKILL BADGES ===== */
.skill-wrap { display: flex; flex-wrap: wrap; gap: .65rem; }
.sk-badge {
  background: rgba(0,180,216,.07);
  border: 1px solid rgba(0,180,216,.22);
  color: var(--teal-light);
  padding: .45rem 1.1rem; border-radius: 100px;
  font-size: .85rem; font-family: var(--font-h); font-weight: 600;
  transition: all var(--t) var(--ease);
}
.sk-badge:hover {
  background: rgba(0,180,216,.18);
  border-color: var(--teal);
  transform: translateY(-2px);
}

/* ===== EDUCATION TIMELINE ===== */
.edu-line { position: relative; padding-left: 2rem; }
.edu-line::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(180deg, var(--teal), transparent);
}
.edu-item { position: relative; margin-bottom: 2.8rem; }
.edu-item::before {
  content: ''; position: absolute; left: -2.45rem; top: .45rem;
  width: 11px; height: 11px;
  background: var(--teal); border-radius: 50%;
  box-shadow: 0 0 10px rgba(0,180,216,.65);
}
.edu-date { color: var(--teal); font-family: var(--font-h); font-size: .82rem; font-weight: 700; margin-bottom: .3rem; }
.edu-deg  { color: var(--white); font-weight: 700; margin-bottom: .2rem; }
.edu-inst { color: var(--text-sec); font-size: .9rem; margin-bottom: .4rem; }
.edu-note { color: var(--text-muted); font-size: .88rem; font-style: italic; }

/* ===== PUBLICATIONS ===== */
.pub-stack { display: flex; flex-direction: column; gap: 1.25rem; }
.pub-card  { display: flex; flex-direction: column; gap: .6rem; padding: 1.75rem; }
.pub-meta  { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.pub-year  { font-family: var(--font-h); font-size: .78rem; color: var(--teal); font-weight: 700; letter-spacing: .8px; text-transform: uppercase; }
.pub-badge {
  display: inline-block; padding: .18rem .7rem; border-radius: 100px;
  font-size: .72rem; font-weight: 700; font-family: var(--font-h); letter-spacing: .4px; text-transform: uppercase;
}
.badge-pub   { background: rgba(0,245,212,.1); color: var(--accent); border: 1px solid rgba(0,245,212,.3); }
.badge-pre   { background: rgba(240,165,0,.1);  color: var(--gold);   border: 1px solid rgba(240,165,0,.3); }
.pub-title   { color: var(--white); font-weight: 700; font-size: 1.02rem; line-height: 1.45; }
.pub-journal { color: var(--text-sec); font-size: .9rem; font-style: italic; }
.pub-doi     { display: inline-flex; align-items: center; gap: .35rem; color: var(--teal); font-size: .82rem; font-family: var(--font-m); }

/* ===== MOLECULE VIEWER ===== */
.viewer-wrap {
  background: var(--navy-card); border: 1px solid var(--border);
  border-radius: var(--r); overflow: hidden;
}
.viewer-head {
  padding: .9rem 1.5rem; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.viewer-title { font-family: var(--font-h); font-weight: 700; color: var(--white); font-size: .95rem; }
.viewer-btns  { display: flex; gap: .5rem; }
.v-btn {
  background: rgba(0,180,216,.1); border: 1px solid var(--border);
  color: var(--teal); padding: .3rem .8rem; border-radius: var(--r-sm);
  font-size: .78rem; font-family: var(--font-h); font-weight: 600;
  cursor: pointer; transition: all var(--t) var(--ease);
}
.v-btn:hover { background: rgba(0,180,216,.22); }
#mol-viewer { width: 100%; height: 380px; position: relative; }
.viewer-cap { padding: .9rem 1.5rem; color: var(--text-muted); font-size: .82rem; border-top: 1px solid var(--border); font-style: italic; }

/* ===== CODE BLOCK ===== */
.code-wrap {
  background: #0d1117; border: 1px solid rgba(0,180,216,.18);
  border-radius: var(--r); overflow: hidden;
}
.code-head {
  background: rgba(0,0,0,.4); padding: .7rem 1.4rem;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(0,180,216,.12);
}
.c-dots { display: flex; gap: 6px; }
.c-dot  { width: 11px; height: 11px; border-radius: 50%; }
.dot-r  { background: #ff5f57; }
.dot-y  { background: #febc2e; }
.dot-g  { background: #28c840; }
.c-lang { color: var(--text-muted); font-family: var(--font-m); font-size: .78rem; }
.code-body { padding: 1.5rem; overflow-x: auto; }
.code-body pre { font-family: var(--font-m); font-size: .85rem; line-height: 1.75; white-space: pre; }

/* ===== TOOL CARDS ===== */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px,1fr)); gap: 1.5rem; }
.tool-icon {
  width: 52px; height: 52px; border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 1.2rem;
}
.ti-rdkit   { background: rgba(0,180,216,.14); }
.ti-dc      { background: rgba(130,170,255,.14); }
.ti-ob      { background: rgba(0,245,212,.14); }
.ti-ase     { background: rgba(240,165,0,.14); }
.ti-pyscf   { background: rgba(199,146,234,.14); }
.ti-torch   { background: rgba(238,77,45,.14); }
.tool-name  { font-family: var(--font-h); font-weight: 800; color: var(--white); font-size: 1.15rem; margin-bottom: .3rem; }
.tool-tag   { color: var(--teal); font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .6px; margin-bottom: .65rem; }
.tool-desc  { color: var(--text-sec); font-size: .93rem; }

/* ===== PIPELINE STEPS ===== */
.pipe-steps { display: flex; flex-direction: column; gap: 0; }
.pipe-step  { display: flex; gap: 1.5rem; padding-bottom: 2rem; }
.pipe-step:last-child { padding-bottom: 0; }
.pipe-left  { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; }
.pipe-num   {
  width: 46px; height: 46px; border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-h); font-weight: 800; font-size: 1.05rem; color: var(--white);
  box-shadow: 0 0 16px rgba(0,180,216,.42);
}
.pipe-line  {
  width: 2px; flex: 1;
  background: linear-gradient(180deg, var(--teal), rgba(0,180,216,.08));
  margin-top: .5rem;
}
.pipe-step:last-child .pipe-line { display: none; }
.pipe-right { flex: 1; padding-top: .5rem; }
.pipe-title { color: var(--white); font-weight: 700; margin-bottom: .35rem; }
.pipe-tool  {
  display: inline-block; background: rgba(0,245,212,.08); color: var(--accent);
  padding: .18rem .7rem; border-radius: 100px; font-size: .75rem;
  font-weight: 700; font-family: var(--font-h); letter-spacing: .4px; margin-bottom: .65rem;
}
.pipe-desc  { color: var(--text-sec); font-size: .93rem; }

/* ===== EXPERIENCE ===== */
.exp-item   { margin-bottom: 2.5rem; }
.exp-head   { display: flex; gap: 1.5rem; align-items: flex-start; margin-bottom: 1rem; }
.exp-ico    {
  width: 52px; height: 52px; border-radius: var(--r-sm);
  background: rgba(0,180,216,.1); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; flex-shrink: 0;
}
.exp-title  { color: var(--white); font-weight: 700; font-size: 1.1rem; margin-bottom: .2rem; }
.exp-org    { color: var(--teal); font-size: .88rem; font-weight: 600; margin-bottom: .15rem; }
.exp-date   { color: var(--text-muted); font-size: .82rem; }
.exp-bul    { display: flex; flex-direction: column; gap: .45rem; }
.exp-bul li {
  color: var(--text-sec); font-size: .93rem;
  padding-left: 1.4rem; position: relative;
}
.exp-bul li::before { content: '→'; position: absolute; left: 0; color: var(--teal); }

/* ===== CONFERENCES ===== */
.conf-item  { padding: 1.1rem 1.25rem; border-radius: var(--r-sm); border-left: 3px solid var(--teal); background: rgba(0,180,216,.04); margin-bottom: .85rem; }
.conf-type  { color: var(--teal); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .6px; margin-bottom: .2rem; }
.conf-title { color: var(--white); font-weight: 600; font-size: .95rem; margin-bottom: .2rem; }
.conf-org   { color: var(--text-muted); font-size: .85rem; }

/* ===== CONTACT ===== */
.contact-info-item {
  display: flex; gap: 1rem; align-items: flex-start;
  padding: 1.1rem; border-radius: var(--r);
  transition: background var(--t) var(--ease);
}
.contact-info-item:hover { background: rgba(0,180,216,.05); }
.c-ico {
  width: 46px; height: 46px; border-radius: var(--r-sm);
  background: rgba(0,180,216,.1); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.c-lbl { color: var(--text-muted); font-size: .77rem; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; margin-bottom: .2rem; }
.c-val { color: var(--text-prim); font-weight: 600; }
.c-val a { color: var(--teal); }
.c-val a:hover { color: var(--teal-light); }
.soc-links { display: flex; gap: .85rem; flex-wrap: wrap; }
.soc-link {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .7rem 1.4rem; border-radius: 100px;
  border: 1px solid var(--border); color: var(--text-sec);
  font-family: var(--font-h); font-weight: 600; font-size: .85rem;
  transition: all var(--t) var(--ease);
}
.soc-link:hover {
  border-color: var(--teal); color: var(--teal);
  background: rgba(0,180,216,.08); transform: translateY(-2px);
}

/* ===== CHART ===== */
.chart-wrap {
  background: var(--navy-card); border: 1px solid var(--border);
  border-radius: var(--r); padding: 2rem;
}
.chart-title { font-family: var(--font-h); font-weight: 700; color: var(--white); margin-bottom: 1.5rem; font-size: 1rem; }

/* ===== ABOUT GRID ===== */
.about-grid { display: grid; grid-template-columns: 270px 1fr; gap: 3.5rem; align-items: start; }
.about-photo { width: 100%; border-radius: var(--r); object-fit: cover; border: 2px solid var(--border); box-shadow: var(--glow); }

/* ===== FOOTER ===== */
.footer { border-top: 1px solid var(--border); padding: 2.5rem 0; text-align: center; }
.footer-text  { color: var(--text-muted); font-size: .875rem; }
.footer-links { display: flex; gap: 1.5rem; justify-content: center; margin-top: 1rem; flex-wrap: wrap; }
.footer-link  { color: var(--text-muted); font-size: .83rem; transition: color var(--t) var(--ease); }
.footer-link:hover { color: var(--teal); }

/* ===== FADE IN ===== */
.fi { opacity: 0; transform: translateY(22px); transition: opacity .65s var(--ease), transform .65s var(--ease); }
.fi.vis { opacity: 1; transform: translateY(0); }
.fi[data-delay="1"] { transition-delay: .1s; }
.fi[data-delay="2"] { transition-delay: .2s; }
.fi[data-delay="3"] { transition-delay: .3s; }
.fi[data-delay="4"] { transition-delay: .4s; }
.fi[data-delay="5"] { transition-delay: .5s; }

/* ===== ANIMATIONS ===== */
@keyframes glowPulse {
  0%,100% { box-shadow: 0 0 70px rgba(0,180,216,.28), 0 0 140px rgba(0,180,216,.1), var(--shadow); }
  50%      { box-shadow: 0 0 90px rgba(0,180,216,.42), 0 0 180px rgba(0,180,216,.18), var(--shadow); }
}
@keyframes scrollBounce {
  0%,100% { transform: translateX(-50%) translateY(0); }
  50%     { transform: translateX(-50%) translateY(8px); }
}
@keyframes float {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(-10px); }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--navy-mid); }
::-webkit-scrollbar-thumb { background: rgba(0,180,216,.35); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--teal); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .metrics-row  { grid-template-columns: repeat(3,1fr); }
  .about-grid   { grid-template-columns: 220px 1fr; gap: 2.5rem; }
  .three-col    { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-menu {
    position: fixed; top: 65px; left: 0; right: 0;
    background: rgba(9,15,30,.97); backdrop-filter: blur(20px);
    flex-direction: column; padding: 2rem;
    transform: translateY(-105%); opacity: 0; pointer-events: none;
    transition: all var(--t) var(--ease);
    border-bottom: 1px solid var(--border);
  }
  .nav-menu.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav-toggle   { display: flex; }
  .hero-img-wrap  { width: 250px; height: 250px; }
  .about-grid   { grid-template-columns: 1fr; }
  .two-col      { grid-template-columns: 1fr; }
  .three-col    { grid-template-columns: 1fr; }
  .metrics-row  { grid-template-columns: repeat(2,1fr); }
  .section      { padding: 64px 0; }
  .hero-tags    { display: none; }
}
@media (max-width: 480px) {
  .metrics-row { grid-template-columns: repeat(2,1fr); }
  .hero-cta    { flex-direction: column; align-items: center; }
}

/* nav-soc rules now live in the NAVBAR block above */

/* Research image */
.research-img-wrap {
  border-radius: var(--r); overflow: hidden;
  box-shadow: var(--shadow), var(--glow);
  border: 1px solid var(--border);
}
.research-img { width: 100%; height: auto; display: block; }

/* Ru viewer container */
#ru-viewer {
  width: 100%; height: 420px;
  position: relative; overflow: hidden; display: block;
}
#ru-viewer canvas {
  position: absolute; top: 0; left: 0;
  width: 100% !important; height: 100% !important;
  display: block;
}

/* ===== COMPREHENSIVE MOBILE RESPONSIVE ===== */
@media (max-width: 768px) {
  /* ── Navbar mobile layout ── */
  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    height: 64px;
  }
  .nav-toggle { display: flex; }
  .nav-right  { display: none; }   /* desktop social, hidden on mobile */

  /* Full-screen slide-down menu */
  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch;
    gap: 0;
    background: rgba(9,15,30,.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border);
    max-height: 0; overflow: hidden; padding: 0;
    transition: max-height .38s cubic-bezier(.4,0,.2,1),
                padding .38s cubic-bezier(.4,0,.2,1);
  }
  .nav-menu.open { max-height: 600px; padding: 8px 0 20px; }

  /* Mobile nav links */
  .nav-link {
    display: flex; align-items: center;
    padding: 14px 28px; font-size: .875rem;
    letter-spacing: .04em; min-height: 52px;
    border-bottom: 1px solid rgba(255,255,255,.04);
  }
  li:last-of-type > .nav-link { border-bottom: none; }
  .nav-link:hover { color: var(--white); background: rgba(255,255,255,.04); }
  .nav-link.active {
    color: var(--teal); background: rgba(0,180,216,.08);
    border: none; border-left: 3px solid var(--teal);
    border-radius: 0; padding: 14px 28px 14px 25px;
  }
  .nav-link::after { display: none; }

  /* Mobile social icons row inside menu */
  .nav-soc-mob {
    display: flex; justify-content: center; gap: 8px;
    padding: 16px 28px 4px; margin-top: 4px;
    border-top: 1px solid var(--border);
  }
  .nav-soc-mob .nav-soc {
    width: 44px; height: 44px; border-radius: 10px;
  }
  .nav-soc-mob .nav-soc::after { display: none; }

  /* Touch targets */
  .btn { min-height: 44px; }
  .v-btn { min-height: 44px; padding: .5rem 1rem; }

  /* Hero sizing */
  .hero-content { gap: 1.25rem; }
  .hero-name { font-size: clamp(1.8rem, 8vw, 2.5rem); }
  .hero-tagline { font-size: .9rem; }

  /* Metrics */
  .metrics-row { grid-template-columns: repeat(2,1fr); gap: .85rem; }
  .metric-num  { font-size: 2.2rem; }
  .metric-card { padding: 1.5rem .75rem; }

  /* Section spacing */
  .section { padding: 56px 0; }
  .container { padding: 0 1.25rem; }
  .section-header { margin-bottom: 36px; }

  /* Cards */
  .card { padding: 1.5rem; }

  /* Viewer */
  #ru-viewer { height: 280px !important; }
  .viewer-head { flex-direction: column; gap: .6rem; align-items: flex-start; }
  .viewer-title { font-size: .82rem; line-height: 1.4; }
  .viewer-btns { gap: .4rem; }

  /* Code */
  .code-body pre { font-size: .75rem; }
  .code-body { padding: 1rem; }

  /* About photo */
  .about-photo { max-width: 240px; margin: 0 auto; display: block; }

  /* Exp */
  .exp-head { gap: 1rem; }
  .exp-ico { width: 44px; height: 44px; }

  /* Pipeline */
  .pipe-step { gap: 1rem; }
  .pipe-num  { width: 38px; height: 38px; font-size: .9rem; }

  /* Tools grid */
  .tools-grid { grid-template-columns: 1fr; }

  /* Contact */
  .contact-info-item { padding: .9rem; }
  .soc-links { gap: .6rem; }
  .soc-link  { padding: .65rem 1rem; font-size: .8rem; }
}

@media (max-width: 480px) {
  .hero-img-wrap { width: 210px; height: 210px; }
  .hero-cta .btn { width: 100%; justify-content: center; max-width: 280px; }
  .section { padding: 48px 0; }
  .container { padding: 0 1rem; }
  .card { padding: 1.25rem; }
  .pub-card { padding: 1.25rem; }
  .conf-item { padding: .9rem 1rem; }
  .section-sub { font-size: .95rem; }
  .h-tag { font-size: .7rem; padding: .25rem .75rem; }
  .sk-badge { font-size: .8rem; padding: .4rem .9rem; }
}

@media (max-width: 375px) {
  .hero-img-wrap { width: 185px; height: 185px; }
  .hero-name { font-size: 1.7rem !important; }
  .container { padding: 0 .9rem; }
  .metrics-row { gap: .6rem; }
  .metric-num { font-size: 1.9rem; }
  .metric-lbl { font-size: .72rem; }
  .card { padding: 1.1rem; }
  .btn { padding: .75rem 1.4rem; font-size: .82rem; }
}

@media (max-width: 320px) {
  .hero-img-wrap { width: 160px; height: 160px; }
  .container { padding: 0 .75rem; }
  .metrics-row { grid-template-columns: 1fr 1fr; gap: .5rem; }
  .card { padding: 1rem; }
  .hero-name { font-size: 1.55rem !important; }
}

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  .fi { transition: none !important; opacity: 1 !important; transform: none !important; }
  .hero-img-wrap { animation: none !important; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}