/* ===================== Design tokens ===================== */
:root{
  --bg:#070d13;
  --bg-alt:#0b131b;
  --surface:#101a24;
  --surface-2:#152230;
  --border:rgba(255,255,255,.09);
  --border-strong:rgba(255,255,255,.16);
  --text:#e9f0f6;
  --text-dim:#9fb0c0;
  --text-faint:#64798a;
  --accent:#22d3ee;
  --accent-2:#f5a524;
  --accent-3:#34d399;
  --accent-rgb:34,211,238;
  --shadow:0 20px 60px -20px rgba(0,0,0,.6);
  --radius:16px;
  --radius-sm:10px;
  --ff-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --ff-mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --maxw:1120px;
}

:root[data-theme="light"]{
  --bg:#f4f7fa;
  --bg-alt:#eaeff4;
  --surface:#ffffff;
  --surface-2:#f4f7fb;
  --border:rgba(10,25,40,.1);
  --border-strong:rgba(10,25,40,.18);
  --text:#0f1a24;
  --text-dim:#4d5f70;
  --text-faint:#8496a6;
  --accent:#0891b2;
  --accent-2:#c2760c;
  --accent-3:#059669;
  --accent-rgb:8,145,178;
  --shadow:0 20px 60px -25px rgba(20,40,60,.25);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important;}
}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--ff-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  transition:background .4s ease,color .4s ease;
  overflow-x:hidden;
}

h1,h2,h3{
  font-family:var(--ff-body);
  font-weight:700;
  letter-spacing:-.02em;
  margin:0;
}

p{margin:0;}
ul{margin:0;padding:0;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer;}
img{max-width:100%;display:block;}

.icon{width:1.1em;height:1.1em;flex:none;}

/* ===================== Background canvas ===================== */
#bg-canvas{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:0;
  pointer-events:none;
  opacity:.55;
}
:root[data-theme="light"] #bg-canvas{opacity:.35;}

/* ===================== Progress bar ===================== */
.progress-bar{
  position:fixed;
  top:0;left:0;
  height:3px;
  width:0%;
  background:linear-gradient(90deg,var(--accent),var(--accent-3),var(--accent-2));
  z-index:1000;
  transition:width .1s linear;
}

/* ===================== Nav ===================== */
.nav{
  position:sticky;
  top:0;
  z-index:100;
  background:color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:14px 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.logo{display:flex;align-items:center;}
.logo-mark{
  font-family:var(--ff-mono);
  font-weight:700;
  font-size:1.05rem;
  letter-spacing:.06em;
  padding:6px 10px;
  border-radius:8px;
  border:1px solid var(--border-strong);
  background:linear-gradient(135deg, color-mix(in srgb, var(--accent) 15%, transparent), transparent);
}
.nav-links{
  display:flex;
  align-items:center;
  gap:26px;
  font-size:.94rem;
}
.nav-links a{
  color:var(--text-dim);
  position:relative;
  padding:4px 0;
  transition:color .2s ease;
  white-space:nowrap;
}
.nav-links a:hover,.nav-links a.is-active{color:var(--text);}
.nav-links a[data-nav]::after{
  content:"";
  position:absolute;
  left:0;bottom:-2px;
  width:0%;
  height:2px;
  background:var(--accent);
  transition:width .25s ease;
}
.nav-links a[data-nav]:hover::after,
.nav-links a[data-nav].is-active::after{width:100%;}
.nav-links a.nav-cv{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:9px 18px;
  border-radius:999px;
  background:linear-gradient(120deg,var(--accent),var(--accent-3));
  color:#04141a;
  font-weight:600;
  font-size:.88rem;
  white-space:nowrap;
  transition:transform .2s ease, box-shadow .2s ease;
}
.nav-links a.nav-cv:hover{color:#04141a;transform:translateY(-1px);box-shadow:0 10px 24px -12px rgba(var(--accent-rgb),.55);}

.nav-controls{display:flex;align-items:center;gap:6px;}
.icon-btn{
  width:38px;height:38px;
  display:flex;align-items:center;justify-content:center;
  border-radius:999px;
  border:1px solid var(--border);
  transition:border-color .2s ease, transform .2s ease, background .2s ease;
}
.icon-btn:hover{border-color:var(--accent);transform:translateY(-1px);}
.icon-moon{display:none;}
:root[data-theme="light"] .icon-sun{display:none;}
:root[data-theme="light"] .icon-moon{display:block;}

.nav-toggle{display:none;}
.icon-close{display:none;}
.nav-toggle.is-open .icon-burger{display:none;}
.nav-toggle.is-open .icon-close{display:block;}

/* ===================== Layout helpers ===================== */
main,footer{position:relative;z-index:1;}
.section{
  max-width:var(--maxw);
  margin:0 auto;
  padding:110px 24px;
}
.section.alt-bg{
  max-width:none;
  background:color-mix(in srgb, var(--surface) 55%, transparent);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.section.alt-bg > *{max-width:var(--maxw);margin-left:auto;margin-right:auto;}
.section.alt-bg{padding-left:0;padding-right:0;}
.section.alt-bg .section-head,.section.alt-bg .skills-wrap,.section.alt-bg .edu-grid,.section.alt-bg .contact-grid{padding:0 24px;}

.section-head{margin-bottom:44px;max-width:640px;}
.section-kicker{
  display:inline-block;
  font-family:var(--ff-mono);
  font-size:.78rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:12px;
}
.section-title{font-size:clamp(1.7rem,3vw,2.4rem);}
.section-sub{margin-top:10px;color:var(--text-dim);font-size:1.02rem;}

/* ===================== Reveal animation ===================== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1);}
.reveal.is-visible{opacity:1;transform:translateY(0);}

/* ===================== Hero ===================== */
.hero{
  max-width:var(--maxw);
  margin:0 auto;
  min-height:calc(100vh - 68px);
  padding:60px 24px 80px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:40px;
  position:relative;
  flex-wrap:wrap;
}
.hero-content{max-width:640px;}
.eyebrow{
  font-family:var(--ff-mono);
  font-size:.85rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--accent-3);
  margin-bottom:18px;
  display:inline-block;
}
.hero-title{
  font-size:clamp(2.2rem,5.4vw,3.6rem);
  line-height:1.08;
  margin-bottom:22px;
}
.hero-title .line{display:block;}
.grad-text{
  background:linear-gradient(100deg,var(--accent),var(--accent-3) 45%,var(--accent-2));
  background-size:200% auto;
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  animation:gradShift 8s ease-in-out infinite;
}
@keyframes gradShift{
  0%,100%{background-position:0% 50%;}
  50%{background-position:100% 50%;}
}
.hero-tagline{
  font-size:1.1rem;
  color:var(--text-dim);
  max-width:56ch;
  margin-bottom:34px;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:28px;}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 22px;
  border-radius:999px;
  font-weight:600;
  font-size:.96rem;
  transition:transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  border:1px solid transparent;
}
.btn-primary{
  background:linear-gradient(120deg,var(--accent),var(--accent-3));
  color:#04141a;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px -10px rgba(var(--accent-rgb),.55);}
.btn-ghost{border-color:var(--border-strong);color:var(--text);}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);}

.hero-meta{display:flex;gap:12px;flex-wrap:wrap;}
.meta-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border-radius:999px;
  border:1px solid var(--border);
  background:color-mix(in srgb, var(--surface) 60%, transparent);
  font-size:.85rem;
  color:var(--text-dim);
}
.status-dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--accent-3);
  box-shadow:0 0 0 0 rgba(52,211,153,.6);
  animation:pulse 2s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(52,211,153,.55);}
  70%{box-shadow:0 0 0 8px rgba(52,211,153,0);}
  100%{box-shadow:0 0 0 0 rgba(52,211,153,0);}
}

/* Hero pillars — the four focus areas radiating from a central badge */
.hero-pillars{
  position:relative;
  width:300px;height:300px;
  flex:none;
  display:flex;align-items:center;justify-content:center;
}
.hero-pillars::before,.hero-pillars::after{
  content:"";
  position:absolute;
  background:var(--border);
}
.hero-pillars::before{left:14%;right:14%;top:50%;height:1px;transform:translateY(-50%);}
.hero-pillars::after{top:14%;bottom:14%;left:50%;width:1px;transform:translateX(-50%);}

.pillar-badge{
  width:112px;height:112px;
  border-radius:50%;
  padding:4px;
  display:flex;align-items:center;justify-content:center;
  background:conic-gradient(from 180deg, var(--accent), var(--accent-3), var(--accent-2), var(--accent));
  box-shadow:0 0 50px -10px rgba(var(--accent-rgb),.5);
  z-index:2;
  animation:breathe 4.5s ease-in-out infinite;
}
.pillar-photo{
  width:100%;
  height:100%;
  border-radius:50%;
  object-fit:cover;
  object-position:center 25%;
  border:3px solid var(--bg);
  display:block;
}
@keyframes breathe{0%,100%{transform:scale(1);}50%{transform:scale(1.05);}}

.pillar-slot{
  position:absolute;
  z-index:2;
}
.slot-top{top:0;left:50%;transform:translate(-50%,0);}
.slot-right{top:50%;right:0;transform:translate(0,-50%);}
.slot-bottom{bottom:0;left:50%;transform:translate(-50%,0);}
.slot-left{top:50%;left:0;transform:translate(0,-50%);}

.pillar-node{
  position:relative;
  display:flex;flex-direction:column;align-items:center;gap:4px;
  width:92px;
  padding:12px 8px;
  border-radius:12px;
  background:var(--surface);
  border:1px solid var(--border);
  text-align:center;
  transition:transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.pillar-node:hover,.pillar-node:focus-visible{
  transform:translateY(-3px) scale(1.05);
  border-color:var(--accent);
  box-shadow:var(--shadow);
  outline:none;
}
.pillar-icon{font-size:1.3rem;line-height:1;}
.pillar-label{font-size:.7rem;font-weight:600;color:var(--text-dim);}

.pillar-tip{
  position:absolute;
  width:200px;
  padding:11px 13px;
  border-radius:10px;
  background:var(--surface-2);
  border:1px solid var(--border-strong);
  font-size:.76rem;
  font-weight:400;
  line-height:1.45;
  color:var(--text-dim);
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease, transform .2s ease;
  z-index:5;
  box-shadow:var(--shadow);
}
.slot-top .pillar-tip{bottom:calc(100% + 10px);left:50%;transform:translate(-50%,6px);}
.slot-bottom .pillar-tip{top:calc(100% + 10px);left:50%;transform:translate(-50%,-6px);}
.slot-left .pillar-tip{right:calc(100% + 10px);top:50%;transform:translate(6px,-50%);}
.slot-right .pillar-tip{left:calc(100% + 10px);top:50%;transform:translate(-6px,-50%);}

.pillar-node:hover .pillar-tip,.pillar-node:focus-visible .pillar-tip{opacity:1;}
.slot-top .pillar-node:hover .pillar-tip,.slot-top .pillar-node:focus-visible .pillar-tip{transform:translate(-50%,0);}
.slot-bottom .pillar-node:hover .pillar-tip,.slot-bottom .pillar-node:focus-visible .pillar-tip{transform:translate(-50%,0);}
.slot-left .pillar-node:hover .pillar-tip,.slot-left .pillar-node:focus-visible .pillar-tip{transform:translate(0,-50%);}
.slot-right .pillar-node:hover .pillar-tip,.slot-right .pillar-node:focus-visible .pillar-tip{transform:translate(0,-50%);}

.scroll-cue{
  position:absolute;
  left:24px;bottom:8px;
  display:flex;
  align-items:center;
  gap:8px;
  font-family:var(--ff-mono);
  font-size:.78rem;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--text-faint);
}
.scroll-cue .icon{animation:bob 2s ease-in-out infinite;}
@keyframes bob{0%,100%{transform:translateY(0);}50%{transform:translateY(6px);}}

/* ===================== About ===================== */
.about-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:32px;
  margin-bottom:56px;
}
.about-text{color:var(--text-dim);font-size:1.03rem;}

.stats-row{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.stat-card{
  padding:26px 20px;
  border-radius:var(--radius);
  border:1px solid var(--border);
  background:var(--surface);
  text-align:center;
  transition:transform .25s ease,border-color .25s ease;
}
.stat-card:hover{transform:translateY(-4px);border-color:var(--accent);}
.stat-number{
  display:block;
  font-family:var(--ff-mono);
  font-size:2.1rem;
  font-weight:700;
  color:var(--accent);
  margin-bottom:8px;
}
.stat-label{font-size:.86rem;color:var(--text-dim);}

/* ===================== Skills ===================== */
.skills-wrap{}
.skills-tabs{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-bottom:28px;
}
.skill-tab{
  padding:9px 16px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--surface);
  color:var(--text-dim);
  font-size:.88rem;
  transition:all .2s ease;
}
.skill-tab:hover{border-color:var(--accent);color:var(--text);}
.skill-tab.is-active{
  background:linear-gradient(120deg,var(--accent),var(--accent-3));
  color:#04141a;
  border-color:transparent;
  font-weight:600;
}
.skills-panels{position:relative;min-height:64px;}
.skill-panel{
  display:none;
  flex-wrap:wrap;
  gap:10px;
}
.skill-panel.is-active{display:flex;animation:fadeUp .45s ease both;}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:translateY(0);}}

.chip{
  display:inline-flex;
  align-items:center;
  padding:9px 16px;
  border-radius:10px;
  background:var(--surface-2);
  border:1px solid var(--border);
  font-size:.88rem;
  color:var(--text);
  transition:transform .2s ease, border-color .2s ease;
}
.chip:hover{transform:translateY(-2px);border-color:var(--accent);color:var(--accent);}
.chip-sm{padding:5px 11px;font-size:.76rem;color:var(--text-dim);}

/* ===================== Timeline ===================== */
.timeline{position:relative;padding-left:28px;}
.timeline::before{
  content:"";
  position:absolute;
  left:5px;top:6px;bottom:6px;
  width:2px;
  background:linear-gradient(var(--accent),var(--accent-3),var(--accent-2));
  opacity:.35;
}
.tl-item{
  position:relative;
  margin-bottom:14px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--surface);
  overflow:hidden;
  transition:border-color .25s ease;
}
.tl-item:hover{border-color:var(--border-strong);}
.tl-marker{
  position:absolute;
  left:-27px;top:24px;
  width:12px;height:12px;
  border-radius:50%;
  background:var(--bg);
  border:2px solid var(--accent);
}
.tl-item.is-open .tl-marker,.tl-item:hover .tl-marker,.tl-item:focus-within .tl-marker{background:var(--accent);}
.tl-head{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:20px 22px;
  text-align:left;
  flex-wrap:wrap;
}
.tl-head h3{font-size:1.08rem;margin-bottom:4px;}
.tl-org{color:var(--text-dim);font-size:.9rem;}
.tl-right{display:flex;align-items:center;gap:14px;}
.tl-date{
  font-family:var(--ff-mono);
  font-size:.8rem;
  color:var(--text-faint);
  white-space:nowrap;
}
.chevron{transition:transform .3s ease;color:var(--text-faint);}
.tl-item.is-open .chevron,.tl-item:hover .chevron,.tl-item:focus-within .chevron{transform:rotate(180deg);color:var(--accent);}
.tl-body{
  max-height:0;
  overflow:hidden;
  transition:max-height .4s ease, padding .4s ease;
  padding:0 22px;
}
.tl-item.is-open .tl-body,.tl-item:hover .tl-body,.tl-item:focus-within .tl-body{max-height:400px;padding:0 22px 22px;}
.tl-body ul{display:flex;flex-direction:column;gap:9px;}
.tl-body li{
  position:relative;
  padding-left:18px;
  color:var(--text-dim);
  font-size:.94rem;
}
.tl-body li::before{
  content:"";
  position:absolute;left:0;top:.55em;
  width:6px;height:6px;border-radius:50%;
  background:var(--accent-3);
}

/* ===================== Education ===================== */
.edu-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:22px;
}
.edu-card{
  padding:28px;
  border-radius:var(--radius);
  border:1px solid var(--border);
  background:var(--surface);
  position:relative;
}
.edu-degree{
  display:inline-block;
  font-family:var(--ff-mono);
  font-size:.78rem;
  font-weight:700;
  padding:4px 10px;
  border-radius:6px;
  background:linear-gradient(120deg,var(--accent),var(--accent-3));
  color:#04141a;
  margin-bottom:14px;
}
.edu-card h3{font-size:1.2rem;margin-bottom:6px;}
.edu-school{color:var(--text-dim);font-size:.92rem;margin-bottom:2px;}
.edu-date{font-family:var(--ff-mono);font-size:.8rem;color:var(--text-faint);margin-bottom:16px;}
.edu-detail{font-size:.89rem;color:var(--text-dim);margin-bottom:8px;}
.edu-detail strong{color:var(--text);}

/* ===================== Projects ===================== */
.project-filters{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-bottom:32px;
}
.filter-chip{
  padding:8px 16px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--surface);
  color:var(--text-dim);
  font-size:.86rem;
  transition:all .2s ease;
}
.filter-chip:hover{border-color:var(--accent);color:var(--text);}
.filter-chip.is-active{
  background:linear-gradient(120deg,var(--accent),var(--accent-3));
  color:#04141a;
  border-color:transparent;
  font-weight:600;
}

.project-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
}
.project-card{
  padding:26px;
  border-radius:var(--radius);
  border:1px solid var(--border);
  background:var(--surface);
  display:flex;
  flex-direction:column;
  gap:12px;
  transition:transform .3s ease, border-color .3s ease, opacity .3s ease;
}
.project-card:hover{transform:translateY(-4px);border-color:var(--border-strong);}
.project-card.is-hidden{display:none;}
.project-top{display:flex;align-items:center;justify-content:space-between;}
.project-icon{font-size:1.6rem;}
.project-date{font-family:var(--ff-mono);font-size:.76rem;color:var(--text-faint);}
.project-card h3{font-size:1.12rem;line-height:1.35;}
.project-summary{color:var(--text-dim);font-size:.92rem;}
.project-details{
  max-height:0;
  overflow:hidden;
  transition:max-height .4s ease;
}
.project-card.is-expanded .project-details{max-height:220px;}
.project-details ul{display:flex;flex-direction:column;gap:8px;padding-top:4px;}
.project-details li{
  position:relative;padding-left:16px;
  color:var(--text-dim);font-size:.88rem;
}
.project-details li::before{
  content:"";position:absolute;left:0;top:.5em;
  width:5px;height:5px;border-radius:50%;
  background:var(--accent);
}
.project-tags{display:flex;flex-wrap:wrap;gap:8px;}
.project-expand{
  align-self:flex-start;
  display:inline-flex;align-items:center;gap:6px;
  color:var(--accent);
  font-size:.85rem;font-weight:600;
  margin-top:4px;
}
.project-card.is-expanded .project-expand .chevron{transform:rotate(180deg);}

/* ===================== Contact ===================== */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1.2fr;
  gap:28px;
}
.contact-cards{display:flex;flex-direction:column;gap:14px;}
.contact-card{
  display:flex;
  align-items:center;
  gap:16px;
  padding:18px 20px;
  border-radius:var(--radius-sm);
  border:1px solid var(--border);
  background:var(--surface);
  transition:transform .2s ease, border-color .2s ease;
}
.contact-card:hover{transform:translateX(4px);border-color:var(--accent);}
.contact-card .icon{color:var(--accent);width:1.3em;height:1.3em;}
.cc-label{display:block;font-size:.76rem;color:var(--text-faint);text-transform:uppercase;letter-spacing:.06em;}
.cc-value{display:block;font-size:.96rem;font-weight:600;margin-top:2px;word-break:break-word;}

.contact-form{
  padding:26px;
  border-radius:var(--radius);
  border:1px solid var(--border);
  background:var(--surface);
  display:flex;
  flex-direction:column;
  gap:16px;
}
.form-row{display:flex;flex-direction:column;gap:6px;}
.form-row label{font-size:.82rem;color:var(--text-dim);}
.form-row input,.form-row textarea{
  padding:12px 14px;
  border-radius:10px;
  border:1px solid var(--border-strong);
  background:var(--bg);
  color:var(--text);
  font-family:var(--ff-body);
  font-size:.95rem;
  resize:vertical;
  transition:border-color .2s ease, box-shadow .2s ease;
}
.form-row input:focus,.form-row textarea:focus{
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(var(--accent-rgb),.18);
}
.contact-form .btn{align-self:flex-start;}
.form-note{font-size:.78rem;color:var(--text-faint);}
.form-note.is-sent{color:var(--accent-3);}

/* ===================== Footer ===================== */
.site-footer{
  max-width:var(--maxw);
  margin:0 auto;
  padding:36px 24px 60px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  color:var(--text-faint);
  font-size:.85rem;
  flex-wrap:wrap;
}
.back-top{
  width:38px;height:38px;
  display:flex;align-items:center;justify-content:center;
  border-radius:50%;
  border:1px solid var(--border);
  transition:border-color .2s ease, transform .2s ease;
}
.back-top:hover{border-color:var(--accent);transform:translateY(-3px);}

/* ===================== Responsive ===================== */
@media (max-width:900px){
  .about-grid{grid-template-columns:1fr;}
  .stats-row{grid-template-columns:repeat(2,1fr);}
  .edu-grid{grid-template-columns:1fr;}
  .project-grid{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .hero-pillars{order:-1;width:230px;height:230px;}
  .pillar-badge{width:92px;height:92px;}
  .pillar-node{width:78px;padding:9px 7px;}
  .pillar-icon{font-size:1.1rem;}
  .pillar-label{font-size:.64rem;}
}

@media (max-width:520px){
  .pillar-tip{width:160px;font-size:.72rem;padding:9px 11px;}
  .slot-top .pillar-tip,.slot-bottom .pillar-tip,.slot-left .pillar-tip,.slot-right .pillar-tip{
    top:100%;bottom:auto;left:50%;right:auto;transform:translate(-50%,8px);
  }
  .slot-top .pillar-node:hover .pillar-tip,.slot-top .pillar-node:focus-visible .pillar-tip,
  .slot-bottom .pillar-node:hover .pillar-tip,.slot-bottom .pillar-node:focus-visible .pillar-tip,
  .slot-left .pillar-node:hover .pillar-tip,.slot-left .pillar-node:focus-visible .pillar-tip,
  .slot-right .pillar-node:hover .pillar-tip,.slot-right .pillar-node:focus-visible .pillar-tip{
    transform:translate(-50%,12px);
  }
}

@media (max-width:760px){
  .nav-links{
    position:fixed;
    top:66px;left:0;right:0;
    background:var(--bg);
    border-bottom:1px solid var(--border);
    flex-direction:column;
    align-items:flex-start;
    gap:0;
    padding:8px 24px 20px;
    transform:translateY(-130%);
    opacity:0;
    transition:transform .3s ease, opacity .3s ease;
    z-index:90;
  }
  .nav-links.is-open{transform:translateY(0);opacity:1;}
  .nav-links a{width:100%;padding:12px 0;border-bottom:1px solid var(--border);}
  .nav-links a.nav-cv{margin-top:10px;justify-content:center;width:100%;border-bottom:none;}
  .nav-toggle{display:flex;}
  .hero{padding-top:30px;min-height:auto;}
  .scroll-cue{display:none;}
  .section{padding:80px 20px;}
}

@media (max-width:520px){
  .stats-row{grid-template-columns:1fr 1fr;}
  .hero-actions{flex-direction:column;align-items:stretch;}
  .btn{justify-content:center;}
}