/* Mehedi Hasan portfolio - FIXED version with menu and skills animation */

html[data-theme="dark"] {
  --p-bg: #0f1419;
  --p-bg-2: #1a1f2e;
  --p-text: #e8e8f0;
  --p-muted: #a0a8b8;
  --p-dim: #7a8290;
  --p-line: rgba(160, 168, 184, 0.25);
  --p-line-soft: rgba(160, 168, 184, 0.12);
  --p-glass: rgba(26, 31, 46, 0.7);
  --p-glass-2: rgba(42, 51, 74, 0.5);
  --p-accent: #ff6b5b;
  --p-accent-text: #ff8870;
  --p-accent-tint: rgba(255, 107, 91, 0.15);
  --p-shadow: 0 0 0 1px rgba(255, 107, 91, 0.2), 0 18px 40px rgba(0, 0, 0, 0.5);
  --p-veil: rgba(15, 20, 25, 0.85);
}

html[data-theme="light"] {
  --p-bg: #ffffff;
  --p-bg-2: #f5f7fa;
  --p-text: #1a1f2e;
  --p-muted: #5a6270;
  --p-dim: #7a8290;
  --p-line: rgba(90, 98, 112, 0.2);
  --p-line-soft: rgba(90, 98, 112, 0.1);
  --p-glass: rgba(255, 255, 255, 0.9);
  --p-glass-2: rgba(245, 247, 250, 0.8);
  --p-accent: #ff6b5b;
  --p-accent-text: #d84b3b;
  --p-accent-tint: rgba(255, 107, 91, 0.1);
  --p-shadow: 0 0 0 1px rgba(255, 107, 91, 0.15), 0 8px 20px rgba(0, 0, 0, 0.08);
  --p-veil: rgba(255, 255, 255, 0.9);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--p-bg);
  color: var(--p-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--font-heading); font-weight: 500; letter-spacing: -.02em; margin: 0; }
p { text-wrap: pretty; }
a { color: var(--p-accent-text); text-decoration: none; }
a:hover { color: var(--p-accent); }
:focus-visible { outline: 2px solid var(--p-accent); outline-offset: 2px; }
::selection { background: var(--p-accent-tint); }

.wrap { position: relative; z-index: 1; max-width: 1180px; margin: 0 auto; padding: 0 20px; }
section.wrap { padding-top: 80px; padding-bottom: 80px; }
.muted { color: var(--p-muted); }
.muted-sm, .sm { font-size: 13.5px; }
.muted-sm { color: var(--p-dim); }
.big { font-size: 16.5px; }
.grow { flex: 1; }
.accent { color: var(--p-accent-text); }
.accent-sm { font-size: 12px; color: var(--p-accent); }
.mono-sm, .mono-label, .mono-note {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--p-dim);
}
.mono-label { color: var(--p-accent-text); }
.mono-note { text-transform: none; letter-spacing: .04em; font-size: 12px; margin: 0 0 22px; }

/* background layers */
.bg-grid, .bg-glow { position: fixed; pointer-events: none; z-index: 0; }
.bg-grid {
  inset: 0;
  background-image: linear-gradient(var(--p-line-soft) 1px, transparent 1px),
                    linear-gradient(90deg, var(--p-line-soft) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 12%, transparent 78%);
          mask-image: radial-gradient(120% 90% at 50% 0%, #000 12%, transparent 78%);
}
.bg-glow {
  top: -18vh; left: 52%; width: 78vw; height: 78vh;
  background: radial-gradient(closest-side, var(--p-accent-tint), transparent 70%);
  filter: blur(10px);
}

/* NAVIGATION - FIXED */
.topbar { position: fixed; top: 14px; left: 50%; transform: translateX(-50%); z-index: 40; width: min(1180px, calc(100% - 28px)); }
.pillnav {
  display: flex; align-items: center; gap: 11px;
  padding: 9px 9px 9px 18px; border-radius: 999px;
  border: 1px solid var(--p-line); background: var(--p-glass);
  -webkit-backdrop-filter: blur(16px) saturate(130%); backdrop-filter: blur(16px) saturate(130%);
  box-shadow: var(--p-shadow);
}
.brand { display: flex; align-items: center; gap: 9px; color: var(--p-text); font-weight: 500; white-space: nowrap; letter-spacing: .02em; }
.brand-dot { width: 9px; height: 9px; border-radius: 2px; background: var(--p-accent); box-shadow: 0 0 12px var(--p-accent); }
.nav-spacer { flex: 1; }

/* MENU LINKS - FIXED TO SHOW */
.nav-links { 
  display: flex; 
  align-items: center; 
  gap: 2px;
  flex-wrap: nowrap;
}
.nav-links a { 
  padding: 7px 11px; 
  border-radius: 999px; 
  font-size: 13.5px; 
  color: var(--p-muted); 
  transition: color .25s, background .25s;
  white-space: nowrap;
}
.nav-links a:hover { background: var(--p-glass-2); color: var(--p-text); }
.nav-links a[data-nav="home"] { color: var(--p-accent); }

.nav-actions { display: flex; gap: 8px; align-items: center; }
.icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--p-line);
  background: transparent; color: var(--p-muted); cursor: pointer;
  transition: color .25s, border .25s;
}
.icon-btn:hover { color: var(--p-text); border-color: var(--p-accent); }

.btn-outline {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border-radius: 8px;
  border: 1px solid var(--p-accent); color: var(--p-accent);
  font-size: 13.5px; font-weight: 500; background: transparent; cursor: pointer;
  transition: all .25s;
}
.btn-outline:hover { background: var(--p-accent-tint); transform: translateY(-1px); }
.btn-outline.lg { padding: 12px 24px; font-size: 14px; }

.btn-quiet {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border-radius: 8px;
  border: 1px solid var(--p-line); color: var(--p-muted);
  font-size: 13.5px; font-weight: 500; background: transparent; cursor: pointer;
  transition: all .25s;
}
.btn-quiet:hover { color: var(--p-text); border-color: var(--p-accent); }
.btn-quiet.lg { padding: 12px 24px; font-size: 14px; }

/* Mobile menu */
.burger { display: none; }
.mobile-menu { display: none; position: fixed; top: 60px; right: 20px; background: var(--p-glass); border: 1px solid var(--p-line); border-radius: 12px; padding: 12px 0; z-index: 35; }
.mobile-menu a { display: block; padding: 12px 24px; color: var(--p-text); }

@media (max-width: 1024px) {
  .nav-links { display: none; }
  .burger { display: flex; }
}

/* hero */
.hero {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
  padding-top: 140px; padding-bottom: 80px;
  max-width: 1180px; margin: 0 auto; position: relative; z-index: 1;
}
.hero-copy { padding: 0 20px; }
.eyebrow { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--p-dim); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 24px; }
.rule { width: 12px; height: 1px; background: var(--p-accent); }
.hero h1 { font-size: 56px; line-height: 1.1; margin: 0 0 24px; }
.role-chips { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.chip { background: var(--p-accent-tint); color: var(--p-accent); padding: 6px 12px; border-radius: 999px; font-size: 13px; font-weight: 500; }
.lede { font-size: 16.5px; line-height: 1.6; color: var(--p-muted); margin: 0 0 32px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-stage { background: var(--p-glass); border: 0.5px solid var(--p-line); border-radius: 12px; padding: 40px; display: flex; align-items: center; justify-content: center; min-height: 320px; position: relative; }
.stage-frame { position: absolute; inset: 20px; border: 0.5px solid var(--p-line); border-radius: 8px; pointer-events: none; }
#heroCanvas { width: 100%; height: 100%; }
.stage-caption { position: absolute; bottom: 12px; font-size: 11px; color: var(--p-dim); text-transform: uppercase; letter-spacing: .1em; }

/* section headers */
.sec-head { display: flex; align-items: center; gap: 12px; margin-bottom: 48px; }
.num { font-size: 32px; font-weight: 500; color: var(--p-dim); }
.sec-head h2 { font-size: 28px; margin: 0; }
.rule-grow { flex: 1; height: 0.5px; background: var(--p-line); }

/* about */
.about-grid { display: grid; grid-template-columns: 1fr 1fr 1.2fr; gap: 24px; }
.profile-card { text-align: center; }
.card { background: var(--p-glass); border: 0.5px solid var(--p-line); border-radius: 12px; padding: 24px; }
.card.glass { -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
.avatar { width: 80px; height: 80px; margin: 0 auto 16px; border-radius: 50%; overflow: hidden; border: 2px solid var(--p-accent); }
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.profile-name { font-weight: 500; margin-bottom: 8px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 16px; }
.tag { background: var(--p-accent-tint); color: var(--p-accent); padding: 4px 8px; border-radius: 4px; font-size: 11px; }
.tag-accent { background: var(--p-accent-tint); color: var(--p-accent); }
.tag-outline { border: 0.5px solid var(--p-line); background: transparent; color: var(--p-muted); }
.photo-tall { border-radius: 12px; overflow: hidden; border: 0.5px solid var(--p-line); }
.photo-tall img { width: 100%; height: auto; }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 24px; }
.stat b { font-size: 20px; color: var(--p-accent); }
.stat span { display: block; font-size: 12px; color: var(--p-dim); margin-top: 4px; }

/* timeline */
.timeline { position: relative; padding-left: 32px; }
.timeline-line { position: absolute; left: 0; top: 0; width: 0.5px; height: 100%; background: var(--p-line); }
.tl-card { margin-bottom: 32px; position: relative; }
.tl-node { position: absolute; left: -16px; top: 0; width: 13px; height: 13px; border-radius: 50%; background: var(--p-accent); border: 3px solid var(--p-bg); box-shadow: 0 0 8px var(--p-accent); }
.tl-top { display: flex; align-items: baseline; gap: 8px; margin-bottom: 8px; }
.tl-top h3 { font-size: 15px; margin: 0; }
.tl-top .grow { flex: 1; }
.tl-top .mono-sm { font-size: 11px; color: var(--p-dim); }

/* SKILLS - FIXED ANIMATION */
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.orbit { 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  height: 300px; 
  position: relative;
  margin: 0 auto;
}
.orbit-core { 
  position: absolute; 
  width: 100px; 
  height: 100px; 
  border-radius: 50%; 
  background: transparent; 
  border: 0.5px solid var(--p-accent); 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  font-weight: 600; 
  font-size: 14px;
  color: var(--p-accent);
  z-index: 10;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  letter-spacing: 0.05em;
}
.orbit-core span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  text-align: center;
  line-height: 1.2;
  word-wrap: break-word;
  font-weight: 600;
  font-size: 14px;
  color: var(--p-accent);
}
.orbit .node { 
  position: absolute; 
  background: var(--p-accent-tint); 
  border: 0.5px solid var(--p-accent); 
  color: var(--p-accent); 
  padding: 6px 12px; 
  border-radius: 999px; 
  font-size: 11px; 
  cursor: pointer; 
  font-weight: 500; 
  transition: all .25s;
  white-space: nowrap;
}
.orbit .node:hover { 
  background: var(--p-accent); 
  color: var(--p-bg); 
  transform: scale(1.1);
}
.skills-side { }
.skill-readout { }
.skill-readout .mono-label { margin-bottom: 16px; }
.skill-readout h3 { font-size: 18px; margin: 0 0 8px; }

/* projects */
.filters { display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; }
.chip-btn { 
  background: transparent; 
  border: 0.5px solid var(--p-line); 
  color: var(--p-muted); 
  padding: 6px 12px; 
  border-radius: 999px; 
  font-size: 13px; 
  cursor: pointer; 
  transition: all .25s;
}
.chip-btn:hover, .chip-btn.on { 
  border-color: var(--p-accent); 
  color: var(--p-accent); 
  background: var(--p-accent-tint);
}
.proj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.proj { 
  background: var(--p-glass); 
  border: 0.5px solid var(--p-line); 
  border-radius: 12px; 
  overflow: hidden; 
  transition: all .3s; 
  cursor: pointer;
}
.proj:hover { 
  border-color: var(--p-accent); 
  transform: translateY(-4px); 
  box-shadow: 0 12px 32px rgba(255, 107, 91, 0.1);
}
.proj-media { 
  width: 100%; 
  height: 160px; 
  background: var(--p-glass-2); 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  color: var(--p-dim); 
  font-size: 13px;
}
.proj-media img { width: 100%; height: 100%; object-fit: cover; }
.proj-body { padding: 20px; }
.proj-meta { display: flex; gap: 8px; align-items: center; }
.proj-body h3 { font-size: 16px; margin: 0 0 8px; }
.proj-body p { font-size: 13px; color: var(--p-muted); margin: 0 0 12px; }
.proj-open { width: 100%; justify-content: center; }

/* services */
.svc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.svc { padding: 24px; }
.svc-icon { font-size: 32px; margin-bottom: 12px; color: var(--p-accent); }
.svc-title { font-weight: 500; margin-bottom: 8px; }
.svc .muted { font-size: 13px; }

/* education */
.edu-list { }
.edu-row { display: flex; gap: 24px; padding: 20px 0; border-bottom: 0.5px solid var(--p-line); }
.edu-row:last-child { border-bottom: none; }
.edu-degree { font-weight: 500; margin-bottom: 4px; }
.cert-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; margin-top: 40px; }
.cert { padding: 20px; background: var(--p-glass); border: 0.5px solid var(--p-line); border-radius: 12px; }
.cert-title { font-weight: 500; margin: 8px 0; }

/* research */
.band { background: var(--p-bg-2); }
.res-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 40px; }
.res { display: grid; grid-template-columns: 120px 1fr; gap: 24px; }
.res.alt { grid-template-columns: 1fr 120px; direction: rtl; }
.res-graphic { height: 120px; background: var(--p-glass); border: 0.5px solid var(--p-line); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: var(--p-dim); position: relative; overflow: hidden; }
.scan { position: absolute; width: 100%; height: 100%; background: repeating-linear-gradient(0deg, rgba(255,107,91,0.15) 0px, rgba(255,107,91,0.15) 1px, transparent 1px, transparent 2px); animation: scan 8s linear infinite; }
@keyframes scan { to { transform: translateY(10px); } }
.res-body { direction: ltr; }
.res-body h3 { font-size: 18px; margin: 0 0 8px; }

/* contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.c-row { display: flex; gap: 12px; padding: 16px 0; border-bottom: 0.5px solid var(--p-line); align-items: flex-start; }
.c-row:last-child { border-bottom: none; }
.c-row.static { cursor: default; }
.c-row a { color: var(--p-text); }
.c-row a:hover { color: var(--p-accent); }
.mono-label { min-width: 80px; flex-shrink: 0; }
.social-row { display: flex; gap: 8px; margin-top: 24px; }
.social-row a { display: inline-flex; }

/* form */
.contact-form { }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field label { font-size: 13px; font-weight: 500; color: var(--p-text); }
.input {
  padding: 12px;
  border: 0.5px solid var(--p-line);
  border-radius: 8px;
  background: var(--p-bg-2);
  color: var(--p-text);
  font-family: inherit;
  font-size: 14px;
  transition: border .25s;
}
.input:hover { border-color: var(--p-accent); }
.input:focus { outline: none; border-color: var(--p-accent); box-shadow: 0 0 0 2px var(--p-accent-tint); }

/* footer */
.foot { border-top: 0.5px solid var(--p-line); padding: 40px 20px; text-align: center; color: var(--p-muted); font-size: 13px; }
.foot-in { display: flex; align-items: center; justify-content: space-between; gap: 24px; max-width: 1180px; margin: 0 auto; }
.foot a { color: var(--p-muted); }
.foot a:hover { color: var(--p-accent); }

/* modal */
.modal { display: none; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.7); z-index: 50; align-items: center; justify-content: center; -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.modal[hidden] { display: none; }
.modal:not([hidden]) { display: flex; }
.modal-card { background: var(--p-bg); border: 0.5px solid var(--p-line); border-radius: 12px; padding: 40px; max-width: 600px; max-height: 80vh; overflow-y: auto; }
.pm-media { width: 100%; height: auto; margin: 16px 0; border-radius: 8px; overflow: hidden; }
.pm-media img { width: 100%; }
.pm-actions { display: flex; gap: 12px; margin-top: 24px; }
.pm-actions a, .pm-actions button { flex: 1; }

/* notes */
.note { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 13px; font-weight: 500; }
.note.ok { background: rgba(0, 200, 100, 0.1); color: #00c864; border: 0.5px solid rgba(0, 200, 100, 0.3); }
.note.bad { background: rgba(255, 100, 100, 0.1); color: #ff6464; border: 0.5px solid rgba(255, 100, 100, 0.3); }

/* responsive */
@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; padding-top: 100px; }
  .hero h1 { font-size: 40px; }
  .nav-links { display: none !important; }
  .topbar { width: min(100%, calc(100% - 28px)); }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .res-grid { grid-template-columns: 1fr; }
  .foot-in { flex-direction: column; }
  section.wrap { padding-top: 60px; padding-bottom: 60px; }
  .modal-card { padding: 24px; max-width: calc(100% - 40px); }
}

/* reveal animation */
.reveal { 
  opacity: 1; 
  animation: reveal .6s ease-out;
}
@keyframes reveal { 
  from { opacity: 0; transform: translateY(20px); } 
  to { opacity: 1; transform: translateY(0); } 
}

/* =========================================================
   PREMIUM DARK MODE + NAVIGATION POLISH v2
   ========================================================= */
html[data-theme="dark"] {
  --p-bg: #070b14;
  --p-bg-2: #0d1322;
  --p-text: #f4f7fb;
  --p-muted: #a7b2c7;
  --p-dim: #68758b;
  --p-line: rgba(148, 163, 184, .18);
  --p-line-soft: rgba(96, 165, 250, .055);
  --p-glass: rgba(13, 19, 34, .72);
  --p-glass-2: rgba(24, 34, 55, .72);
  --p-accent: #38bdf8;
  --p-accent-text: #67e8f9;
  --p-accent-tint: rgba(56, 189, 248, .105);
  --p-shadow: 0 0 0 1px rgba(56,189,248,.09), 0 20px 60px rgba(0,0,0,.38);
  --p-veil: rgba(7, 11, 20, .92);
}

html[data-theme="light"] {
  --p-bg: #f7faff;
  --p-bg-2: #edf3fa;
  --p-text: #111827;
  --p-muted: #526074;
  --p-dim: #7b8798;
  --p-line: rgba(71, 85, 105, .16);
  --p-line-soft: rgba(14, 116, 144, .07);
  --p-glass: rgba(255,255,255,.78);
  --p-glass-2: rgba(238,245,252,.82);
  --p-accent: #0891b2;
  --p-accent-text: #0e7490;
  --p-accent-tint: rgba(8,145,178,.09);
  --p-shadow: 0 0 0 1px rgba(8,145,178,.08), 0 18px 45px rgba(15,23,42,.08);
  --p-veil: rgba(247,250,255,.94);
}

body {
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(56,189,248,.075), transparent 65%),
    radial-gradient(700px 500px at -10% 35%, rgba(99,102,241,.045), transparent 65%),
    var(--p-bg);
  transition: background .35s ease, color .35s ease;
}

.bg-grid { background-size: 72px 72px; opacity: .8; }
.bg-glow {
  top: -25vh; left: 48%; width: 80vw; height: 72vh;
  background: radial-gradient(closest-side, rgba(56,189,248,.105), transparent 68%);
  filter: blur(18px);
  opacity: .85;
}

/* premium floating navigation */
.topbar { top: 16px; width: min(1220px, calc(100% - 32px)); }
.pillnav {
  min-height: 58px;
  padding: 7px 8px 7px 17px;
  gap: 8px;
  border-radius: 18px;
  border-color: rgba(148,163,184,.17);
  background: linear-gradient(135deg, rgba(13,19,34,.82), rgba(10,15,27,.68));
  box-shadow: 0 18px 55px rgba(0,0,0,.22), inset 0 1px 0 rgba(255,255,255,.035);
}
html[data-theme="light"] .pillnav {
  background: rgba(255,255,255,.84);
  box-shadow: 0 16px 45px rgba(15,23,42,.09), inset 0 1px 0 rgba(255,255,255,.9);
}
.brand { font-weight: 650; letter-spacing: .035em; }
.brand-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--p-accent);
  box-shadow: 0 0 0 4px rgba(56,189,248,.08), 0 0 18px rgba(56,189,248,.7);
}
.nav-links {
  gap: 3px;
  max-width: 720px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 3px;
}
.nav-links::-webkit-scrollbar { display:none; }
.nav-links a {
  position: relative;
  padding: 8px 10px;
  border: 1px solid transparent;
  color: var(--p-muted);
  font-size: 12.5px;
  font-weight: 500;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 10px; right: 10px; bottom: 4px;
  height: 2px; border-radius: 99px;
  background: var(--p-accent);
  transform: scaleX(0);
  transition: transform .22s ease;
}
.nav-links a:hover,
.nav-links a.on,
.nav-links a[data-nav="home"] {
  color: var(--p-text);
  background: rgba(56,189,248,.07);
  border-color: rgba(56,189,248,.10);
}
.nav-links a.on::after,
.nav-links a[data-nav="home"]::after { transform: scaleX(1); }
.nav-links a:hover { color: var(--p-accent-text); }

.nav-actions { gap: 7px; }
.icon-btn {
  width: 38px; height: 38px;
  border-radius: 11px;
  background: rgba(255,255,255,.025);
  border-color: var(--p-line);
}
.icon-btn:hover {
  color: var(--p-accent-text);
  background: var(--p-accent-tint);
  border-color: rgba(56,189,248,.35);
  box-shadow: 0 0 20px rgba(56,189,248,.08);
}
.btn-outline {
  border-color: rgba(56,189,248,.55);
  color: var(--p-accent-text);
  background: linear-gradient(135deg, rgba(56,189,248,.08), rgba(99,102,241,.045));
  box-shadow: inset 0 0 20px rgba(56,189,248,.025);
}
.btn-outline:hover {
  color: #e6fbff;
  border-color: var(--p-accent);
  background: linear-gradient(135deg, rgba(56,189,248,.18), rgba(99,102,241,.10));
  box-shadow: 0 8px 30px rgba(56,189,248,.12);
}
html[data-theme="light"] .btn-outline:hover { color: #083344; }

/* mobile menu */
.mobile-menu {
  right: 0;
  top: 68px;
  width: min(310px, calc(100vw - 32px));
  padding: 8px;
  border-radius: 18px;
  background: rgba(10,15,27,.94);
  box-shadow: 0 24px 70px rgba(0,0,0,.4);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  backdrop-filter: blur(22px) saturate(140%);
  transform: translateY(-8px) scale(.98);
  opacity: 0;
  visibility: hidden;
  transition: opacity .22s ease, transform .22s ease, visibility .22s;
}
html[data-theme="light"] .mobile-menu { background: rgba(255,255,255,.96); }
.mobile-menu.open {
  display: block;
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}
.mobile-menu a {
  margin: 2px 0;
  padding: 11px 14px;
  border-radius: 11px;
  font-size: 14px;
  color: var(--p-muted);
  transition: .2s ease;
}
.mobile-menu a:hover {
  color: var(--p-text);
  background: var(--p-accent-tint);
  padding-left: 18px;
}

/* cards get depth instead of flat blocks */
.card.glass, .proj, .svc, .cert, .hero-stage, .skill-readout, .res-graphic {
  border-color: rgba(148,163,184,.14);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.025), 0 12px 35px rgba(0,0,0,.12);
}
.card.glass:hover, .proj:hover, .svc:hover, .cert:hover {
  border-color: rgba(56,189,248,.28);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.035), 0 18px 48px rgba(0,0,0,.22), 0 0 28px rgba(56,189,248,.045);
}
.proj { border-radius: 18px; }
.proj-media { height: 180px; position: relative; }
.proj-media::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(3,7,18,.45));
  pointer-events: none;
}

/* section headings */
.sec-head { margin-bottom: 38px; }
.num { font-size: 13px; color: var(--p-accent-text); font-family: ui-monospace, monospace; letter-spacing: .12em; }
.sec-head h2 { font-size: 30px; font-weight: 600; }
.rule-grow { background: linear-gradient(90deg, var(--p-line), transparent); }

/* hero polish */
.hero { gap: 72px; }
.hero h1 {
  font-weight: 650;
  letter-spacing: -.045em;
  text-shadow: 0 10px 40px rgba(56,189,248,.08);
}
.hero-stage {
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(15,23,42,.76), rgba(8,13,25,.55));
  box-shadow: 0 30px 80px rgba(0,0,0,.24), inset 0 1px 0 rgba(255,255,255,.035);
}
html[data-theme="light"] .hero-stage { background: linear-gradient(145deg, rgba(255,255,255,.9), rgba(237,243,250,.72)); }

/* active mobile breakpoint: use menu earlier so nav never feels cramped */
@media (max-width: 1180px) {
  .nav-links { max-width: 570px; }
  .nav-links a { padding-left: 8px; padding-right: 8px; }
  .btn-outline:not(.lg) { padding-left: 11px; padding-right: 11px; }
}
@media (max-width: 1024px) {
  .pillnav { border-radius: 16px; }
  .nav-links { display: none; }
  .burger { display: flex; }
}
@media (max-width: 768px) {
  .topbar { top: 10px; width: calc(100% - 20px); }
  .pillnav { min-height: 54px; padding-left: 13px; }
  .brand { font-size: 13px; }
  .hero-stage { min-height: 300px; padding: 25px; border-radius: 20px; }
  .sec-head h2 { font-size: 26px; }
}


/* Research photo cards */
.res-graphic img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition: transform .45s ease, filter .45s ease;
}
.res:hover .res-graphic img {
  transform: scale(1.06);
  filter: saturate(1.08);
}