/* ═══════════════════════════════════════════════════
   LUNAR NUCLEAR POWER PLANT: Styles
   ═══════════════════════════════════════════════════ */

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

:root {
  --bg:         #06090f;
  --bg-surface: #0c1322;
  --bg-alt:     #0a1120;
  --bg-card:    #111e35;
  --bg-card-h:  #172540;
  --accent:     #f5a520;
  --accent-dim: rgba(245,165,32,.13);
  --accent-glow:rgba(245,165,32,.32);
  --accent2:    #ff6b35;
  --green:      #4ade80;
  --blue:       #60a5fa;
  --text:       #e2e8f0;
  --text-muted: #7a8ba0;
  --text-faint: #3a4d63;
  --border:     rgba(255,255,255,.07);
  --border-acc: rgba(245,165,32,.26);
  --radius:     12px;
  --radius-sm:  8px;
  --shadow:     0 4px 24px rgba(0,0,0,.45);
  --nav-h:      60px;
  --tr:         0.2s ease;
  --font-head:  'Space Grotesk', system-ui, sans-serif;
  --font-body:  'Inter', system-ui, sans-serif;
}

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body { background: var(--bg); color: var(--text); font-family: var(--font-body); font-size: 1rem; line-height: 1.7; -webkit-font-smoothing: antialiased; }
img  { display: block; max-width: 100%; }
a    { color: var(--accent); text-decoration: none; transition: opacity var(--tr); }
a:hover { opacity: .75; }

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 700; line-height: 1.15; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4.8rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); margin-bottom: .75rem; }
h3 { font-size: 1.1rem; margin-bottom: .5rem; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }

/* ─── Nav ───────────────────────────────────────────── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  background: rgba(6,9,15,.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--tr);
}
#navbar.scrolled { background: rgba(6,9,15,.96); border-bottom-color: rgba(245,165,32,.1); }

.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex; align-items: center; gap: 1rem;
}

.nav-logo { font-family: var(--font-head); font-weight: 700; font-size: 1rem; color: var(--accent); white-space: nowrap; flex-shrink: 0; }
.nav-logo:hover { opacity: 1; }

.nav-links {
  list-style: none; padding: 0;
  display: flex; gap: 0;
  overflow-x: auto; /* single scrollable row — no wrapping */
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  margin-left: auto;
  flex-shrink: 1;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links li { flex-shrink: 0; }
.nav-links a {
  display: block;
  color: var(--text-muted); font-size: .8rem; font-weight: 500;
  padding: .4rem .65rem; border-radius: var(--radius-sm); white-space: nowrap;
  transition: color var(--tr), background var(--tr);
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); background: var(--accent-dim); opacity: 1; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: .5rem; margin-left: auto; flex-shrink: 0; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .2s, opacity .2s; }
.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); }

/* ─── Hero ──────────────────────────────────────────── */
#hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden; background: var(--bg);
  padding-top: var(--nav-h);
}
#starfield { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }

.hero-content { position: relative; z-index: 2; max-width: 660px; padding: 4rem 1.5rem 4rem 6vw; }
.hero-badge { display: inline-block; background: var(--accent-dim); border: 1px solid var(--border-acc); color: var(--accent); font-size: .72rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; padding: .3rem .85rem; border-radius: 999px; margin-bottom: 1.5rem; }
.accent { color: var(--accent); }
.hero-sub { font-size: 1.05rem; color: var(--text-muted); line-height: 1.75; margin: 1.25rem 0 2rem; max-width: 520px; }
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-moon { position: absolute; right: -80px; top: 50%; transform: translateY(-50%); width: 500px; height: 500px; z-index: 1; pointer-events: none; }
.moon-orb { width: 100%; height: 100%; border-radius: 50%; background: radial-gradient(ellipse at 35% 35%, #d4c8a8 0%, #b0a080 30%, #7a6e50 60%, #3a3020 100%); box-shadow: inset -40px -20px 80px rgba(0,0,0,.6); opacity: .4; }
.moon-glow { position: absolute; inset: -60px; border-radius: 50%; background: radial-gradient(circle, rgba(245,165,32,.08) 0%, transparent 70%); animation: pulse 6s ease-in-out infinite; }
@keyframes pulse { 0%,100%{transform:scale(1);opacity:.6} 50%{transform:scale(1.06);opacity:1} }

.btn { display: inline-block; padding: .7rem 1.6rem; border-radius: 999px; font-family: var(--font-head); font-size: .9rem; font-weight: 600; cursor: pointer; transition: transform .15s, box-shadow .15s, opacity .15s; }
.btn:hover { transform: translateY(-2px); opacity: 1; }
.btn-primary { background: var(--accent); color: #06090f; box-shadow: 0 4px 18px var(--accent-glow); }
.btn-primary:hover { box-shadow: 0 6px 28px var(--accent-glow); }
.btn-outline { border: 1.5px solid var(--border-acc); color: var(--accent); background: transparent; }
.btn-outline:hover { background: var(--accent-dim); }

/* ─── Accordion wrapper ─────────────────────────────── */
.acc-sections { border-top: 1px solid var(--border); }

.acc-section { border-bottom: 1px solid var(--border); }

.acc-head {
  width: 100%; background: none; border: none; cursor: pointer; text-align: left;
  display: flex; align-items: center; gap: 1.25rem;
  padding: 1.4rem 1.5rem;
  transition: background var(--tr);
}
.acc-head:hover { background: rgba(255,255,255,.025); }
.acc-section.open .acc-head { background: rgba(245,165,32,.04); }

.acc-n { font-family: var(--font-head); font-size: .72rem; font-weight: 700; color: var(--text-faint); letter-spacing: .06em; min-width: 2rem; flex-shrink: 0; }
.acc-section.open .acc-n { color: var(--accent); }

.acc-meta { flex: 1; min-width: 0; }
.acc-title { display: block; font-family: var(--font-head); font-size: 1.05rem; font-weight: 600; color: var(--text); }
.acc-section.open .acc-title { color: var(--accent); }
.acc-sub { display: block; font-size: .8rem; color: var(--text-muted); margin-top: .15rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Toggle +/- icon */
.acc-toggle { width: 22px; height: 22px; position: relative; flex-shrink: 0; }
.acc-toggle::before, .acc-toggle::after { content: ''; position: absolute; background: var(--text-muted); border-radius: 2px; transition: transform .28s ease, opacity .28s ease; }
.acc-toggle::before { width: 2px; height: 14px; top: 4px; left: 10px; }
.acc-toggle::after  { width: 14px; height: 2px; top: 10px; left: 4px; }
.acc-section.open .acc-toggle::before { transform: rotate(90deg); opacity: 0; }
.acc-section.open .acc-toggle::after  { background: var(--accent); }

/* Body collapse/expand */
.acc-body { max-height: 0; overflow: hidden; transition: max-height .38s cubic-bezier(0.4,0,0.2,1); }
.acc-inner { padding: 0 1.5rem 2.5rem; }

/* ─── Section label / intro ─────────────────────────── */
.section-label { font-size: .7rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: .6rem; }
.section-intro  { color: var(--text-muted); font-size: 1rem; max-width: 720px; margin-bottom: 2rem; line-height: 1.8; }
.body-text p    { color: var(--text-muted); margin-bottom: 1rem; line-height: 1.85; }
.body-text p:last-child { margin-bottom: 0; }

/* ─── Inline glossary terms ─────────────────────────── */
.term { border-bottom: 1px dashed var(--accent); cursor: help; position: relative; display: inline; transition: color var(--tr); }
.term:hover { color: var(--accent); }
.term::after { content: attr(data-def); position: absolute; bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%); width: 290px; background: var(--bg-card); border: 1px solid var(--border-acc); border-radius: var(--radius-sm); padding: .7rem .95rem; font-size: .8rem; line-height: 1.55; color: var(--text); font-family: var(--font-body); font-weight: 400; pointer-events: none; opacity: 0; transition: opacity .18s; z-index: 200; white-space: normal; text-align: left; box-shadow: var(--shadow); }
.term::before { content: ''; position: absolute; bottom: calc(100% + 2px); left: 50%; transform: translateX(-50%); border: 5px solid transparent; border-top-color: var(--border-acc); pointer-events: none; opacity: 0; transition: opacity .18s; z-index: 201; }
.term:hover::after, .term:hover::before, .term.active::after, .term.active::before { opacity: 1; }
.term.tip-left::after  { left: 0; transform: none; }
.term.tip-right::after { left: auto; right: 0; transform: none; }

/* ─── Content grid (text + aside) ──────────────────── */
.content-grid { display: grid; grid-template-columns: 1fr 300px; gap: 2.5rem; align-items: start; margin-top: 1.5rem; }

/* ─── Fact cards ────────────────────────────────────── */
.fact-stack { display: flex; flex-direction: column; gap: .85rem; }
.fact-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.25rem; transition: border-color var(--tr); }
.fact-card:hover { border-color: var(--border-acc); }
.fact-number { font-family: var(--font-head); font-size: 1.8rem; font-weight: 700; color: var(--accent); line-height: 1; margin-bottom: .3rem; }
.fact-unit   { font-size: .95rem; }
.fact-label  { font-size: .78rem; color: var(--text-muted); line-height: 1.4; }

/* ─── Timeline ──────────────────────────────────────── */
.timeline-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; margin-top: 1.5rem; }
.timeline-col-head { font-family: var(--font-head); font-size: .88rem; font-weight: 600; color: var(--accent); margin-bottom: 1.25rem; }
.timeline { position: relative; padding-left: 1.6rem; }
.timeline::before { content: ''; position: absolute; left: 0; top: 6px; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--accent), rgba(245,165,32,.08)); }
.timeline-item { position: relative; padding-bottom: 1.5rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before { content: ''; position: absolute; left: -1.77rem; top: 5px; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); border: 2px solid var(--bg); box-shadow: 0 0 0 3px var(--accent-dim); }
.timeline-year  { font-family: var(--font-head); font-size: .7rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .1em; margin-bottom: .15rem; }
.timeline-title { font-family: var(--font-head); font-weight: 600; font-size: .88rem; margin-bottom: .25rem; }
.timeline-desc  { font-size: .8rem; color: var(--text-muted); line-height: 1.6; }

/* ─── Callout ───────────────────────────────────────── */
.callout { display: flex; gap: 1rem; background: var(--accent-dim); border: 1px solid var(--border-acc); border-radius: var(--radius); padding: 1.1rem 1.4rem; margin-top: 1.5rem; }
.callout-icon { font-size: 1.3rem; flex-shrink: 0; padding-top: .1rem; }
.callout-text  { font-size: .88rem; color: var(--text-muted); line-height: 1.7; }
.callout-text strong { color: var(--text); }

/* ─── Artemis mission cards ─────────────────────────── */
.mission-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; margin-top: 1.5rem; }
.mission-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; position: relative; overflow: hidden; transition: border-color var(--tr), transform var(--tr); }
.mission-card:hover { border-color: var(--border-acc); }
.mission-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; }
.mission-card.done::before   { background: var(--green); }
.mission-card.soon::before   { background: var(--accent); }
.mission-card.future::before { background: var(--blue); }
.mission-badge { display: inline-block; font-size: .65rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; padding: .18rem .6rem; border-radius: 999px; margin-bottom: .85rem; }
.mission-badge.done   { background: rgba(74,222,128,.14); color: var(--green); border: 1px solid rgba(74,222,128,.28); }
.mission-badge.soon   { background: var(--accent-dim);   color: var(--accent); border: 1px solid var(--border-acc); }
.mission-badge.future { background: rgba(96,165,250,.12); color: var(--blue);  border: 1px solid rgba(96,165,250,.28); }
.mission-num  { font-family: var(--font-head); font-size: 1.3rem; font-weight: 700; margin-bottom: .2rem; }
.mission-date { font-size: .75rem; color: var(--text-muted); margin-bottom: .7rem; }
.mission-card p { font-size: .85rem; color: var(--text-muted); line-height: 1.7; margin-bottom: .65rem; }
.mission-card p:last-child { margin-bottom: 0; }

/* ─── Location ──────────────────────────────────────── */
.location-grid { display: grid; grid-template-columns: 1fr 320px; gap: 2.5rem; align-items: start; margin-top: 1.5rem; }
.location-text p { color: var(--text-muted); margin-bottom: 1rem; line-height: 1.85; }
.location-text h3 { color: var(--accent); margin-top: 1.5rem; margin-bottom: .5rem; font-size: 1rem; }
.location-facts { display: flex; flex-direction: column; gap: .85rem; }
.loc-fact { background: var(--bg-card); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: .9rem 1.1rem; }
.loc-fact-label { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); margin-bottom: .2rem; }
.loc-fact-value { font-family: var(--font-head); font-size: .95rem; font-weight: 600; color: var(--text); line-height: 1.3; }
.loc-fact-note  { font-size: .75rem; color: var(--text-muted); margin-top: .15rem; line-height: 1.4; }

/* ─── Power uses ────────────────────────────────────── */
.power-intro-grid { display: grid; grid-template-columns: 1fr 260px; gap: 2.5rem; align-items: start; margin-bottom: 2rem; }
.power-intro-text p { color: var(--text-muted); margin-bottom: 1rem; line-height: 1.85; }
.power-total-card { background: var(--bg-card); border: 2px solid var(--border-acc); border-radius: var(--radius); padding: 1.5rem; text-align: center; }
.power-total-label { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--text-muted); margin-bottom: .4rem; }
.power-total-num   { font-family: var(--font-head); font-size: 2.8rem; font-weight: 700; color: var(--accent); line-height: 1; }
.power-total-note  { font-size: .75rem; color: var(--text-muted); margin-top: .5rem; line-height: 1.5; }
.power-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.power-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.2rem; transition: border-color var(--tr); }
.power-card:hover { border-color: var(--border-acc); }
.power-icon    { font-size: 1.4rem; margin-bottom: .4rem; }
.power-system  { font-family: var(--font-head); font-size: .85rem; font-weight: 600; margin-bottom: .2rem; }
.power-kw      { font-family: var(--font-head); font-size: 1.25rem; font-weight: 700; color: var(--accent); }
.power-unit    { font-size: .75rem; font-weight: 500; }
.power-bar-wrap{ height: 4px; background: var(--bg-surface); border-radius: 99px; margin: .55rem 0 .4rem; overflow: hidden; }
.power-bar     { height: 100%; border-radius: 99px; background: linear-gradient(to right, var(--accent), var(--accent2)); }
.power-desc    { font-size: .76rem; color: var(--text-muted); line-height: 1.55; }

/* ─── Objectives ────────────────────────────────────── */
.objectives-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.1rem; margin-top: 1.5rem; }
.obj-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.4rem; transition: border-color var(--tr), transform var(--tr); }
.obj-card:hover { border-color: var(--border-acc); }
.obj-icon { font-size: 1.5rem; margin-bottom: .65rem; }
.obj-card h3 { color: var(--accent); margin-bottom: .4rem; font-size: .95rem; }
.obj-card p  { font-size: .85rem; color: var(--text-muted); line-height: 1.7; }

/* ─── Methods ───────────────────────────────────────── */
.methods-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; margin-top: 1.5rem; }
.method-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; position: relative; overflow: hidden; transition: border-color var(--tr), transform var(--tr); }
.method-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(to right, var(--accent), var(--accent2)); }
.method-card:hover { border-color: var(--border-acc); }
.method-num  { font-family: var(--font-head); font-size: 2rem; font-weight: 700; color: var(--text-faint); line-height: 1; margin-bottom: .65rem; }
.method-card h3 { color: var(--text); margin-bottom: .5rem; }
.method-card p  { font-size: .85rem; color: var(--text-muted); line-height: 1.7; }

/* ─── Architecture diagram ──────────────────────────── */
.arch-diagram { display: flex; align-items: center; overflow-x: auto; padding: 2rem 0 1rem; -webkit-overflow-scrolling: touch; }
.arch-node { flex-shrink: 0; width: 155px; background: var(--bg-card); border: 1.5px solid var(--border); border-top: 3px solid var(--accent-color, var(--accent)); border-radius: var(--radius); padding: 1.2rem .9rem 1rem; text-align: center; transition: transform var(--tr), box-shadow var(--tr); }
.arch-node:hover { border-color: var(--border-acc); }
.arch-icon { font-size: 1.6rem; margin-bottom: .4rem; }
.arch-name { font-family: var(--font-head); font-weight: 600; font-size: .82rem; margin-bottom: .25rem; }
.arch-desc { font-size: .7rem; color: var(--text-muted); line-height: 1.4; }
.arch-connector { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; width: 70px; gap: 3px; }
.arch-arrow-line { width: 100%; height: 2px; background: linear-gradient(to right, var(--border-acc), var(--accent)); position: relative; }
.arch-arrow-line::after { content: ''; position: absolute; right: -1px; top: 50%; transform: translateY(-50%); border: 5px solid transparent; border-left-color: var(--accent); border-right: 0; }
.arch-label-over { font-size: .65rem; color: var(--text-faint); white-space: nowrap; }
.arch-heat-bar { display: flex; align-items: flex-start; gap: .85rem; background: rgba(255,107,53,.07); border: 1px solid rgba(255,107,53,.2); border-radius: var(--radius); padding: 1rem 1.25rem; margin-top: 1.5rem; }
.heat-icon { font-size: 1.3rem; flex-shrink: 0; }
.heat-text { font-size: .85rem; color: var(--text-muted); line-height: 1.65; }
.heat-text strong { color: var(--accent2); }

/* ─── Diagram placeholder ───────────────────────────── */
.diagram-block { margin-top: 1.75rem; }
.diagram-block h3 { font-size: .95rem; color: var(--text-muted); margin-bottom: .75rem; }
.diagram-slot { background: var(--bg-card); border: 2px dashed var(--border-acc); border-radius: var(--radius); padding: 2.5rem 1.5rem; text-align: center; color: var(--text-muted); font-size: .85rem; line-height: 1.6; }
.diagram-slot .ds-label { font-family: var(--font-head); font-size: .95rem; font-weight: 600; color: var(--accent); margin-bottom: .4rem; }
.diagram-slot input[type=file] { display: none; }
.diagram-slot label { display: inline-block; margin-top: .75rem; padding: .45rem 1.1rem; background: var(--accent-dim); border: 1px solid var(--border-acc); border-radius: 999px; color: var(--accent); font-size: .78rem; font-weight: 600; cursor: pointer; transition: background var(--tr); }
.diagram-slot label:hover { background: rgba(245,165,32,.22); }
.diagram-img { display: block; width: 100%; border-radius: var(--radius-sm); margin-top: .75rem; }

/* ─── Spec table ────────────────────────────────────── */
.spec-table { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; margin-top: 1.25rem; }
.spec-row { display: flex; border-bottom: 1px solid var(--border); }
.spec-row:last-child { border-bottom: none; }
.spec-key { width: 52%; padding: .65rem .9rem; font-size: .78rem; font-weight: 600; color: var(--text-muted); background: rgba(255,255,255,.02); border-right: 1px solid var(--border); }
.spec-val { flex: 1; padding: .65rem .9rem; font-size: .82rem; font-family: var(--font-head); font-weight: 600; color: var(--accent); }

/* ─── Subsystem tabs ────────────────────────────────── */
.subsystem-tabs { display: flex; gap: .45rem; flex-wrap: wrap; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: .85rem; }
.tab-btn { background: none; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .42rem 1rem; color: var(--text-muted); font-family: var(--font-head); font-size: .8rem; font-weight: 600; cursor: pointer; transition: color var(--tr), background var(--tr), border-color var(--tr); }
.tab-btn:hover { color: var(--text); border-color: rgba(255,255,255,.2); }
.tab-btn.active { color: var(--accent); background: var(--accent-dim); border-color: var(--border-acc); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ─── Subsystem detail ──────────────────────────────── */
.subsystem-detail { display: grid; grid-template-columns: 1fr 260px; gap: 2rem; align-items: start; margin-top: .5rem; }
.subsystem-text p { color: var(--text-muted); margin-bottom: 1rem; line-height: 1.8; font-size: .9rem; }
.subsystem-text h3 { color: var(--accent); margin-bottom: .75rem; font-size: 1.15rem; }
.tech-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: .6rem; margin-top: .5rem; }
.tech-list li { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .65rem .9rem; font-size: .85rem; color: var(--text-muted); line-height: 1.6; }
.tech-list li strong { color: var(--text); }
.tech-list li.selected { border-color: var(--border-acc); background: var(--accent-dim); }
.tech-list li.selected strong { color: var(--accent); }
.selected-tag { font-size: .63rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; background: var(--accent); color: #06090f; padding: .12rem .45rem; border-radius: 999px; margin-left: .4rem; vertical-align: middle; }

/* ─── Results ───────────────────────────────────────── */
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 1.75rem; }
.result-card { background: var(--bg-card); border: 1px solid var(--border-acc); border-radius: var(--radius); padding: 1.25rem; text-align: center; transition: border-color var(--tr); }
.result-card:hover { border-color: var(--accent); }
.result-number { font-family: var(--font-head); font-size: 2rem; font-weight: 700; color: var(--accent); line-height: 1; margin-bottom: .35rem; }
.result-unit   { font-size: .9rem; font-weight: 500; }
.result-label  { font-size: .78rem; color: var(--text-muted); line-height: 1.5; margin-top: .2rem; }
.results-findings { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.results-findings h3 { color: var(--accent); margin-bottom: .85rem; }
.results-findings ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: .55rem; }
.results-findings li { font-size: .86rem; color: var(--text-muted); padding-left: 1.2rem; position: relative; line-height: 1.65; }
.results-findings li::before { content: '▶'; position: absolute; left: 0; color: var(--accent); font-size: .5rem; top: .45em; }

/* ─── Conclusions / Future ──────────────────────────── */
.conclusions-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 1rem; }
.conclusion-block, .future-block { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.conclusion-block h3 { color: var(--accent); margin-bottom: .9rem; }
.future-block h3     { color: var(--blue);   margin-bottom: .9rem; }
.conclusion-list, .future-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: .7rem; }
.conclusion-list li, .future-list li { font-size: .86rem; color: var(--text-muted); padding-left: 1.3rem; position: relative; line-height: 1.65; }
.conclusion-list li::before { content: '✓'; position: absolute; left: 0; color: var(--green); font-weight: 700; }
.future-list li::before     { content: '→'; position: absolute; left: 0; color: var(--blue); font-weight: 700; }

/* ─── Glossary ──────────────────────────────────────── */
.glossary-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: .85rem; margin-top: 1rem; }
.glossary-entry { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.1rem; transition: border-color var(--tr); }
.glossary-entry:hover { border-color: var(--border-acc); }
.glossary-term { font-family: var(--font-head); font-size: .9rem; font-weight: 600; color: var(--accent); margin-bottom: .3rem; }
.glossary-def  { font-size: .79rem; color: var(--text-muted); line-height: 1.6; }

/* ─── Sources ───────────────────────────────────────── */
.sources-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: .85rem; counter-reset: src; margin-top: 1rem; }
.source-item { counter-increment: src; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.1rem 1rem 3.5rem; position: relative; font-size: .85rem; line-height: 1.6; display: flex; flex-direction: column; gap: .15rem; transition: border-color var(--tr); }
.source-item:hover { border-color: var(--border-acc); }
.source-item::before { content: counter(src); position: absolute; left: 1.1rem; top: 1rem; font-family: var(--font-head); font-size: 1rem; font-weight: 700; color: var(--text-faint); }
.source-authors { color: var(--text-muted); font-style: italic; font-size: .8rem; }
.source-title   { color: var(--text); font-weight: 500; }
.source-venue   { color: var(--text-muted); font-size: .8rem; }
.source-link    { color: var(--accent); font-size: .78rem; font-weight: 500; align-self: flex-start; margin-top: .1rem; }
.sources-note   { margin-top: 1.25rem; font-size: .82rem; color: var(--text-muted); background: var(--bg-card); border: 1px dashed var(--border); border-radius: var(--radius-sm); padding: .8rem 1rem; }

/* ─── Team ──────────────────────────────────────────── */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.team-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.4rem 1rem 1.1rem; text-align: center; transition: border-color var(--tr), transform var(--tr); }
.team-card:hover { border-color: var(--border-acc); }
.team-photo { width: 70px; height: 70px; border-radius: 50%; background: var(--bg-surface); border: 2px solid var(--border-acc); object-fit: cover; margin: 0 auto .75rem; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.team-photo img  { width: 100%; height: 100%; object-fit: cover; }
.team-photo-placeholder { width: 70px; height: 70px; border-radius: 50%; background: var(--accent-dim); border: 2px solid var(--border-acc); display: flex; align-items: center; justify-content: center; font-family: var(--font-head); font-size: 1rem; font-weight: 700; color: var(--accent); margin: 0 auto .75rem; }
.team-name { font-weight: 600; font-size: .88rem; margin-bottom: .2rem; }
.team-dept { font-size: .75rem; color: var(--text-muted); }

.advisor-block { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.75rem; text-align: center; }
.advisor-label { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--text-faint); margin-bottom: .4rem; }
.advisor-names { font-family: var(--font-head); font-size: 1.05rem; font-weight: 600; margin-bottom: .65rem; }
.advisor-thanks { font-size: .82rem; color: var(--text-muted); margin-bottom: 1rem; }
.wpi-badge { display: inline-block; background: var(--accent-dim); border: 1px solid var(--border-acc); color: var(--accent); font-size: .75rem; font-weight: 600; padding: .3rem .9rem; border-radius: 999px; letter-spacing: .05em; }

/* ─── Paper download button ─────────────────────────── */
.download-btn { display: inline-flex; align-items: center; gap: .6rem; background: var(--bg-card); border: 1.5px solid var(--border-acc); border-radius: var(--radius); padding: .85rem 1.4rem; color: var(--text); font-family: var(--font-head); font-size: .9rem; font-weight: 600; transition: background var(--tr), transform var(--tr); cursor: pointer; margin-top: 1.5rem; }
.download-btn:hover { background: var(--accent-dim); transform: translateY(-2px); opacity: 1; }
.download-btn .dl-icon { font-size: 1.2rem; }
.download-note { font-size: .78rem; color: var(--text-muted); margin-top: .5rem; }

/* ─── Footer ────────────────────────────────────────── */
footer { background: var(--bg-surface); border-top: 1px solid var(--border); padding: 2.5rem 0; }
.footer-inner { display: flex; flex-direction: column; align-items: center; text-align: center; gap: .6rem; }
.footer-logo  { font-family: var(--font-head); font-weight: 700; font-size: .95rem; color: var(--accent); }
.footer-note  { font-size: .78rem; color: var(--text-faint); max-width: 480px; line-height: 1.6; }
.footer-top   { font-size: .78rem; color: var(--text-muted); margin-top: .35rem; }

/* ─── Responsive ────────────────────────────────────── */
@media (max-width: 900px) {
  .content-grid        { grid-template-columns: 1fr; }
  .timeline-wrap       { grid-template-columns: 1fr; }
  .location-grid       { grid-template-columns: 1fr; }
  .power-intro-grid    { grid-template-columns: 1fr; }
  .subsystem-detail    { grid-template-columns: 1fr; }
  .conclusions-grid    { grid-template-columns: 1fr; }
  .hero-moon           { width: 300px; height: 300px; right: -120px; opacity: .2; }
}
@media (max-width: 768px) {
  .nav-links { display: none; position: fixed; top: var(--nav-h); left: 0; right: 0; background: rgba(6,9,15,.97); backdrop-filter: blur(20px); flex-direction: column; align-items: stretch; padding: .75rem; border-bottom: 1px solid var(--border); gap: .15rem; overflow-x: unset; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .7rem .9rem; font-size: .9rem; white-space: normal; }
  .nav-toggle { display: flex; }
  .hero-content { padding: 2rem 1.25rem; }
  .acc-head { padding: 1.1rem 1rem; }
  .acc-inner { padding: 0 1rem 2rem; }
  .acc-sub  { display: none; }
}
@media (max-width: 480px) {
  .hero-cta { flex-direction: column; }
  .results-grid { grid-template-columns: 1fr 1fr; }
  .arch-node { width: 110px; }
  .arch-desc { display: none; }
}