/* =========================================================================
   Mohsen Seyedkazemi Ardebili — "Clean Signal"
   Modern, bright, minimal. Off-white canvas · indigo accent · teal for "live".
   Light by default; [data-theme="dark"] provides a refined dark variant.
   Type: Space Grotesk (display) · IBM Plex Sans (body) · IBM Plex Mono (data)
   ========================================================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  color-scheme: light;

  --ink:      #FBFBFD;   /* page canvas (kept name for compatibility) */
  --panel:    #FFFFFF;   /* raised surfaces / cards */
  --panel-2:  #F3F4F8;   /* inset / subtle fills */
  --line:     #E7E9EF;   /* hairlines */
  --line-2:   #D7DBE3;
  --text:     #14161C;   /* near-black ink */
  --muted:    #586070;
  --muted-2:  #8B93A1;

  --amber:    #4F46E5;   /* PRIMARY ACCENT — indigo (name kept for compat) */
  --amber-2:  #4338CA;   /* darker accent for hover */
  --amber-dim:#EEF0FE;   /* accent tint background */
  --mint:     #0E9E8C;   /* secondary — teal, used for "live"/metrics */
  --mint-dim: #E4F6F2;   /* teal tint */
  --red:      #E5484D;

  --on-accent:#FFFFFF;               /* text on the accent */
  --nav-bg:   rgba(255,255,255,0.80);
  --overlay-bg:rgba(255,255,255,0.98);
  --grid:     #ECEEF3;               /* ambient grid line */

  --shadow-sm:0 1px 2px rgba(20,22,28,.05);
  --shadow:   0 18px 44px -22px rgba(24,26,38,.28);
  --accent-glow: rgba(79,70,229,.30);

  --term-bg:  #0E1017;   /* terminal stays dark in both themes (a focal accent) */
  --term-text:#E7EAF0;
  --term-line:#23262F;

  --display: 'Space Grotesk', system-ui, sans-serif;
  --body:    'IBM Plex Sans', system-ui, sans-serif;
  --mono:    'IBM Plex Mono', ui-monospace, monospace;

  --max: 1120px;
  --r:   14px;
}

[data-theme="dark"] {
  color-scheme: dark;

  --ink:      #0E1016;
  --panel:    #171A22;
  --panel-2:  #1E222C;
  --line:     #262B36;
  --line-2:   #333A48;
  --text:     #EAECF2;
  --muted:    #9AA3B2;
  --muted-2:  #6B7482;

  --amber:    #8B93F8;
  --amber-2:  #A5ABFA;
  --amber-dim:#20233A;
  --mint:     #3FD79A;
  --mint-dim: #14302A;
  --red:      #F2685B;

  --on-accent:#0E1016;
  --nav-bg:   rgba(14,16,22,0.82);
  --overlay-bg:rgba(14,16,22,0.98);
  --grid:     #1B1F29;

  --shadow-sm:0 1px 2px rgba(0,0,0,.3);
  --shadow:   0 26px 54px -26px rgba(0,0,0,.72);
  --accent-glow: rgba(139,147,248,.40);

  --term-bg:  #0A0C11;
}

html { scroll-behavior: smooth; }

body {
  background: var(--ink);
  color: var(--text);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background .3s ease, color .3s ease;
}

/* faint ambient grid — very low intensity, fades from the top */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.6;
  mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, #000 25%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, #000 25%, transparent 72%);
  pointer-events: none;
  z-index: 0;
}

a { color: var(--amber); text-decoration: none; transition: color .18s; }
a:hover { color: var(--amber-2); }

::selection { background: rgba(79,70,229,.20); color: var(--text); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--amber); color: var(--on-accent); padding: 10px 16px;
  font-family: var(--mono); font-weight: 600; border-radius: 0 0 var(--r) 0;
}
.skip-link:focus { left: 0; }

/* ---------- layout ---------- */
.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
.panel-section { padding: 108px 0; position: relative; z-index: 1; }
.panel-section.alt { background: var(--panel-2); border-block: 1px solid var(--line); }

.section-eyebrow {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--amber);
  margin-bottom: 18px;
}
.section-eyebrow a { color: var(--mint); }

.section-title {
  font-family: var(--display);
  font-size: clamp(1.8rem, 3.6vw, 2.7rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin-bottom: 14px;
}
.section-lead { color: var(--muted); max-width: 60ch; margin-bottom: 44px; }
.section-title + .section-lead { margin-top: 6px; }

/* ---------- nav ---------- */
#nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background .3s, backdrop-filter .3s, border-color .3s;
  border-bottom: 1px solid transparent;
}
#nav.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  height: 66px; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-weight: 600; font-size: 1rem;
  color: var(--text); letter-spacing: .01em;
}
.nav-logo:hover { color: var(--text); }
.logo-mark { display: block; }

.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links > a { font-size: .9rem; color: var(--muted); font-weight: 500; }
.nav-links > a:hover { color: var(--text); }
.nav-cta {
  background: var(--amber); color: var(--on-accent) !important; font-weight: 600;
  padding: 9px 18px; border-radius: 10px; box-shadow: var(--shadow-sm);
  transition: background .18s, transform .18s, box-shadow .18s;
}
.nav-cta:hover { background: var(--amber-2); color: var(--on-accent) !important; transform: translateY(-1px); box-shadow: 0 10px 24px -12px var(--accent-glow); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .3s, opacity .3s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* theme toggle */
.theme-toggle {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--panel); border: 1px solid var(--line-2); color: var(--muted);
  cursor: pointer; transition: color .18s, border-color .18s, background .18s;
}
.theme-toggle:hover { color: var(--amber); border-color: var(--amber); }
.theme-toggle svg { width: 18px; height: 18px; display: block; }
.theme-toggle .ic-sun { display: none; }
.theme-toggle .ic-moon { display: block; }
[data-theme="dark"] .theme-toggle .ic-sun { display: block; }
[data-theme="dark"] .theme-toggle .ic-moon { display: none; }

/* nav: Projects dropdown */
.nav-dd { position: relative; display: inline-flex; }
.nav-dd-btn {
  font-family: var(--body); font-size: .9rem; color: var(--muted); font-weight: 500;
  background: none; border: none; cursor: pointer; padding: 0;
  display: inline-flex; align-items: center; gap: 6px;
}
.nav-dd-btn:hover, .nav-dd.open .nav-dd-btn, .nav-dd:hover .nav-dd-btn { color: var(--text); }
.nav-dd-caret { transition: transform .2s; }
.nav-dd.open .nav-dd-caret, .nav-dd:hover .nav-dd-caret { transform: rotate(180deg); }
.nav-dd-menu {
  position: absolute; top: calc(100% + 14px); left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 190px; padding: 6px;
  background: var(--overlay-bg); backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line-2); border-radius: 12px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 2px;
  opacity: 0; pointer-events: none; transition: opacity .18s, transform .18s;
}
/* invisible bridge across the gap so hover doesn't break when moving
   from the button down to the menu items */
.nav-dd-menu::before {
  content: ''; position: absolute; top: -18px; left: 0; right: 0; height: 20px;
}
.nav-dd:hover .nav-dd-menu, .nav-dd:focus-within .nav-dd-menu, .nav-dd.open .nav-dd-menu {
  opacity: 1; pointer-events: auto; transform: translateX(-50%) translateY(0);
}
.nav-dd-menu a {
  font-family: var(--body); font-size: .9rem; color: var(--muted);
  padding: 9px 13px; border-radius: 8px; white-space: nowrap;
}
.nav-dd-menu a:hover { color: var(--amber); background: var(--panel-2); }

/* ---------- hero ---------- */
.hero { padding: 156px 0 100px; position: relative; z-index: 1; }
.hero-grid {
  display: grid; grid-template-columns: 1.12fr .88fr; gap: 56px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: .8rem; letter-spacing: .06em;
  color: var(--muted); margin-bottom: 26px;
  border: 1px solid var(--line); border-radius: 100px; padding: 6px 14px;
  background: var(--panel); box-shadow: var(--shadow-sm);
}
.pulse-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--mint);
  box-shadow: 0 0 0 0 var(--mint); animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(14,158,140,.5); }
  70% { box-shadow: 0 0 0 8px rgba(14,158,140,0); }
  100% { box-shadow: 0 0 0 0 rgba(14,158,140,0); }
}

.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.3rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin-bottom: 18px;
}
.amber { color: var(--amber); }
.hero-thesis {
  font-family: var(--display);
  font-size: clamp(1.3rem, 2.5vw, 1.95rem);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--text);
  max-width: 22ch;
  margin-bottom: 22px;
}
.lede { font-size: clamp(1.02rem, 1.5vw, 1.2rem); color: var(--muted); max-width: 52ch; margin-bottom: 34px; }

.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 30px; }
.btn-primary {
  background: var(--amber); color: var(--on-accent); font-weight: 600; font-size: .92rem;
  padding: 13px 26px; border-radius: 11px; box-shadow: var(--shadow-sm);
  transition: transform .18s, box-shadow .18s, background .18s;
}
.btn-primary:hover { color: var(--on-accent); background: var(--amber-2); transform: translateY(-2px); box-shadow: 0 16px 34px -14px var(--accent-glow); }
.btn-ghost {
  border: 1px solid var(--line-2); color: var(--text); font-weight: 500; font-size: .92rem;
  padding: 13px 22px; border-radius: 11px; display: inline-flex; align-items: center; gap: 7px;
  background: var(--panel);
  transition: border-color .18s, transform .18s, color .18s, box-shadow .18s;
}
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn-ghost.sm { padding: 8px 16px; font-size: .82rem; }

.status-strip {
  list-style: none; display: flex; flex-wrap: wrap; gap: 8px 26px;
  font-family: var(--mono); font-size: .78rem; color: var(--muted);
  border-top: 1px solid var(--line); padding-top: 22px;
}
.status-strip .k { color: var(--amber); margin-right: 8px; }

.hero-explore {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px;
  margin-top: 16px; font-family: var(--mono); font-size: .8rem;
}
.hero-explore .he-label { color: var(--muted-2); text-transform: uppercase; letter-spacing: .1em; }
.hero-explore a { color: var(--text); border-bottom: 1px solid var(--line-2); padding-bottom: 1px; }
.hero-explore a:hover { color: var(--amber); border-color: var(--amber); }

/* control-loop signature panel */
.loop-panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 18px;
  overflow: hidden; box-shadow: var(--shadow);
}
.panel-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: .76rem; color: var(--muted);
  background: var(--panel-2);
}
.panel-title { color: var(--text); }
.panel-state { margin-left: auto; color: var(--mint); }
.dot-mint { width: 8px; height: 8px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 8px var(--mint); flex: none; }

.loop-stage { padding: 22px; display: grid; place-items: center;
  background: radial-gradient(ellipse 70% 70% at 50% 45%, var(--amber-dim), transparent 70%); }
.loop-svg { width: 100%; max-width: 320px; height: auto; }
.loop-ring { fill: none; stroke: var(--line-2); stroke-width: 1.5; stroke-dasharray: 4 6; }
.loop-node rect { fill: var(--panel); stroke: var(--line-2); stroke-width: 1.2; }
.loop-node text {
  fill: var(--text); font-family: var(--mono); font-size: 13px; font-weight: 600;
  text-anchor: middle; letter-spacing: .04em;
}
.loop-node.gate rect { stroke: var(--amber); fill: var(--amber-dim); }
.loop-node.gate text { fill: var(--amber); }
.loop-pulse { fill: var(--mint); filter: drop-shadow(0 0 6px var(--mint)); offset-path: circle(118px at 160px 160px); animation: orbit 6s linear infinite; }
@keyframes orbit { from { offset-distance: 0%; } to { offset-distance: 100%; } }

.loop-caption {
  font-family: var(--mono); font-size: .72rem; color: var(--muted-2);
  text-align: center; padding: 14px 16px 18px;
}

/* ---------- profile ---------- */
.profile-grid { display: grid; grid-template-columns: 280px 1fr; gap: 56px; align-items: start; }
.profile-photo { position: sticky; top: 92px; }
.profile-photo img {
  width: 100%; max-width: 280px; aspect-ratio: 1; object-fit: cover; object-position: top center;
  border-radius: 18px; border: 1px solid var(--line); box-shadow: var(--shadow);
}
.photo-tag {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 14px;
  font-family: var(--mono); font-size: .74rem; color: var(--muted);
}
.profile-text h2 {
  font-family: var(--display); font-size: clamp(1.5rem, 2.8vw, 2.1rem); font-weight: 600;
  letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 22px; max-width: 22ch;
}
.profile-text p { color: var(--muted); margin-bottom: 18px; font-size: 1.04rem; }
.profile-text p:last-child { margin-bottom: 0; }
.profile-text strong { color: var(--text); }
.profile-text em { color: var(--text); font-style: normal; box-shadow: inset 0 -0.5em 0 var(--amber-dim); }

/* ---------- systems / cards ---------- */
.systems-grid, .ships-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.ships-grid { margin-top: 8px; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px;
  padding: 26px; box-shadow: var(--shadow-sm);
  transition: border-color .2s, transform .2s, box-shadow .2s;
}
.card:hover { border-color: var(--line-2); transform: translateY(-4px); box-shadow: var(--shadow); }
.card-wide { grid-column: 1 / -1; background: linear-gradient(135deg, var(--panel), var(--amber-dim)); border-color: var(--line-2); }
.card-wide:hover { border-color: var(--amber); }

.card-bar { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.card-name { font-family: var(--display); font-weight: 600; font-size: 1.2rem; color: var(--text); }
.card-name .aka { font-family: var(--mono); font-size: .82rem; color: var(--muted-2); font-weight: 400; }
a.card-name-link { color: var(--text); transition: color .18s; }
a.card-name-link:hover { color: var(--amber); }
.card-badge {
  font-family: var(--mono); font-size: .66rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--amber); background: var(--amber-dim); border: 1px solid var(--accent-border, var(--line-2));
  padding: 3px 9px; border-radius: 100px;
}
.card-badge.subtle { color: var(--muted); background: var(--panel-2); border-color: var(--line-2); }
.card-links { margin-left: auto; display: flex; gap: 16px; font-family: var(--mono); font-size: .9rem; }
.card-links a { color: var(--muted); font-weight: 500; }
.card-links a:hover { color: var(--amber); }

.card-desc { color: var(--muted); font-size: 1rem; line-height: 1.65; margin-bottom: 16px; }
.card-desc strong, .card-desc em { color: var(--text); font-style: normal; }
.card code, .pub code { font-family: var(--mono); font-size: .85em; color: var(--amber); background: var(--amber-dim); padding: 1px 6px; border-radius: 5px; }

.ticks { list-style: none; margin-bottom: 18px; }
.ticks li { position: relative; padding: 5px 0 5px 24px; font-size: .95rem; line-height: 1.55; color: var(--muted); }
.ticks li::before { content: '→'; position: absolute; left: 0; color: var(--amber); }

.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span {
  font-family: var(--mono); font-size: .76rem; color: var(--muted);
  background: var(--panel-2); border: 1px solid var(--line); padding: 4px 11px; border-radius: 6px;
}

/* readouts (telemetry-style metrics) */
.card-wide-body { display: grid; grid-template-columns: 1fr 320px; gap: 28px; }
.readout {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 14px; padding: 20px;
  display: flex; flex-direction: column; gap: 12px;
}
.readout-row { display: flex; align-items: baseline; gap: 12px; }
.rv { font-family: var(--mono); font-size: 1.5rem; font-weight: 600; color: var(--mint); line-height: 1; min-width: 84px; }
.rv .ru { font-size: .9rem; color: var(--muted); margin-left: 2px; }
.rl { font-size: .88rem; color: var(--muted); }

.term {
  font-family: var(--mono); font-size: .86rem; line-height: 1.75; color: var(--term-text);
  background: var(--term-bg); border: 1px solid var(--term-line); border-radius: 12px;
  padding: 16px; margin-top: 4px; white-space: pre-wrap; overflow-x: auto;
}
.t-dim { color: #9aa3b2; }
.t-mint { color: #4be0ad; }
.t-amber { color: #b3adf8; }

.mini-readout { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 16px; font-family: var(--mono); font-size: .88rem; color: var(--muted); }
.mini-readout b { color: var(--mint); font-weight: 600; }

/* ---------- research ---------- */
.research-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; margin-bottom: 34px; }
.research-head .section-title { margin-bottom: 0; }
.scholar-readout { display: flex; align-items: center; gap: 26px; }
.scholar-readout > div { display: flex; flex-direction: column; }
.sv { font-family: var(--mono); font-size: 1.4rem; font-weight: 600; color: var(--text); line-height: 1; }
.sl { font-size: .72rem; color: var(--muted); font-family: var(--mono); }

.eu-rail { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 36px; }
.eu-label { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; color: var(--muted-2); text-transform: uppercase; margin-right: 6px; }
.chip {
  font-family: var(--mono); font-size: .76rem; color: var(--text);
  background: var(--panel); border: 1px solid var(--line-2); padding: 4px 11px; border-radius: 100px;
}
.chip em { color: var(--mint); font-style: normal; font-size: .9em; margin-left: 4px; }

.pub-list { list-style: none; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; margin-bottom: 48px; background: var(--panel); }
.pub { padding: 18px 22px; border-bottom: 1px solid var(--line); transition: background .15s; }
.pub:last-child { border-bottom: none; }
.pub:hover { background: var(--panel-2); }
.pub-venue { display: block; font-family: var(--mono); font-size: .74rem; color: var(--amber); margin-bottom: 5px; }
.pub-venue em { color: var(--muted); font-style: normal; }
.pub-venue em.cite { color: var(--mint); }
.pub a, .pub-title { font-size: .98rem; color: var(--text); font-weight: 500; }
.pub a:hover { color: var(--amber); }

.service { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.svc { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 22px; box-shadow: var(--shadow-sm); }
.svc h3 { font-family: var(--mono); font-size: .76rem; text-transform: uppercase; letter-spacing: .07em; color: var(--amber); margin-bottom: 8px; }
.svc p { font-size: .88rem; color: var(--muted); }

/* ---------- stack ---------- */
.stack-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stack-col { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 24px; box-shadow: var(--shadow-sm); }
.stack-col h3 { font-family: var(--mono); font-size: .78rem; text-transform: uppercase; letter-spacing: .07em; color: var(--amber); margin-bottom: 14px; }
.pills { display: flex; flex-wrap: wrap; gap: 7px; }
.pills span {
  font-family: var(--mono); font-size: .78rem; color: var(--muted);
  background: var(--panel-2); border: 1px solid var(--line); padding: 5px 12px; border-radius: 100px;
  transition: border-color .15s, color .15s;
}
.pills span:hover { border-color: var(--amber); color: var(--amber); }

/* ---------- contact ---------- */
.contact { padding: 116px 0; text-align: center; position: relative; z-index: 1; border-top: 1px solid var(--line); }
.contact .section-eyebrow { text-align: center; }
.contact-h { font-family: var(--display); font-size: clamp(1.9rem, 4vw, 2.9rem); font-weight: 600; letter-spacing: -0.02em; margin-bottom: 16px; }
.contact-lead { color: var(--muted); max-width: 52ch; margin: 0 auto 40px; }
.contact-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.clink {
  display: inline-flex; align-items: center; gap: 9px; color: var(--muted);
  border: 1px solid var(--line-2); background: var(--panel);
  padding: 11px 20px; border-radius: 11px; font-size: .9rem; font-weight: 500;
  transition: color .18s, border-color .18s, transform .18s, box-shadow .18s;
}
.clink:hover { color: var(--amber); border-color: var(--amber); transform: translateY(-2px); box-shadow: var(--shadow-sm); }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 30px 0; position: relative; z-index: 1; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; font-family: var(--mono); font-size: .78rem; color: var(--muted-2); }
.footer-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-nav a { color: var(--muted); font-family: var(--mono); font-size: .78rem; }
.footer-nav a:hover { color: var(--amber); }

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .loop-panel { max-width: 440px; }
  .card-wide-body { grid-template-columns: 1fr; }
  .profile-grid { grid-template-columns: 1fr; gap: 32px; }
  .profile-photo { position: static; max-width: 220px; }
  .stack-grid { grid-template-columns: repeat(2, 1fr); }
  .service { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .panel-section { padding: 80px 0; }
  .hero { padding: 128px 0 76px; }
  .systems-grid, .ships-grid, .stack-grid { grid-template-columns: 1fr; }
  .scholar-readout { gap: 18px; }
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; inset: 66px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--overlay-bg); backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line); padding: 8px 0;
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: opacity .22s, transform .22s;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links > a { padding: 13px 24px; font-size: 1rem; }
  .nav-cta { margin: 8px 24px; text-align: center; }
  .theme-toggle { margin: 8px 24px; width: auto; height: auto; padding: 12px; }
  /* Projects dropdown → inline accordion on mobile */
  .nav-dd { width: 100%; flex-direction: column; }
  .nav-dd-btn { width: 100%; padding: 13px 24px; font-size: 1rem; justify-content: space-between; color: var(--muted); }
  .nav-dd-menu {
    position: static; transform: none; opacity: 1; pointer-events: auto; display: none;
    min-width: 0; padding: 0; background: none; border: none; box-shadow: none;
    backdrop-filter: none; -webkit-backdrop-filter: none;
  }
  .nav-dd.open .nav-dd-menu { display: flex; }
  .nav-dd-menu::before { display: none; }
  .nav-dd-menu a { padding: 11px 24px 11px 40px; font-size: .96rem; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .loop-pulse { display: none; }
  .reveal { opacity: 1; transform: none; }
}