/* ============================================================
   Ink & Photosphere — design system
   Warm paper, near-black ink, K-dwarf amber accent.
   Diverging blue/red is reserved for magnetic-field data.
   ============================================================ */

:root {
  --paper:      #FAF7F0;
  --paper-deep: #F2ECE1;
  --ink:        #211B15;
  --ink-soft:   #4A4238;
  --muted:      #7C7264;
  --hairline:   #DDD4C4;
  --amber:      #B05A0E;   /* links, accents on paper */
  --amber-soft: #E8A33D;   /* highlights on dark panels */
  --panel:      #141E2A;   /* dark "figure" background */
  --panel-edge: #2A3646;
  --panel-text: #E9E3D6;
  --panel-muted:#93A0B0;

  --serif: "Fraunces", Georgia, serif;
  --sans:  "Public Sans", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono:  "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.2;
  margin: 0 0 0.6em;
}
h2 { font-size: 2.0rem; letter-spacing: -0.01em; }
h3 { font-size: 1.3rem; }

p { margin: 0 0 1.1em; }
strong { font-weight: 600; }

a { color: var(--amber); text-decoration: none; border-bottom: 1px solid rgba(176,90,14,0.30); transition: border-color 0.2s, color 0.2s; }
a:hover { color: var(--ink); border-color: var(--ink); }

.container { max-width: 1360px; margin: 0 auto; padding: 0 40px; }
.container--wide { max-width: 1560px; }

section { padding: 80px 0; scroll-margin-top: 90px; }
section.alt { background: var(--paper-deep); }

.kicker {
  display: block;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 14px;
}

.lead {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--ink-soft);
  line-height: 1.65;
}

.smallnote { font-size: 0.82rem; color: var(--muted); line-height: 1.6; }
.prose { max-width: 46em; }
.prose-wide { max-width: none; }

/* Field-line section divider */
.divider { display: flex; justify-content: center; padding: 0; background: var(--paper); }
.divider svg { width: 260px; height: 44px; opacity: 0.55; }

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250,247,240,0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: 1560px; margin: 0 auto; padding: 14px 40px;
  display: flex; align-items: baseline; justify-content: space-between; gap: 18px;
}
.nav-name { font-family: var(--serif); font-weight: 600; font-size: 1.18rem; color: var(--ink); border: none; }
.nav-name:hover { color: var(--amber); }
.nav-links { display: flex; gap: 22px; flex-wrap: wrap; }
.nav-links a {
  font-size: 0.85rem; font-weight: 400; letter-spacing: 0.04em;
  color: var(--ink-soft); border-bottom: 1px solid transparent;
}
.nav-links a:hover { color: var(--amber); border-color: var(--amber); }

/* ============================================================
   Hero
   ============================================================ */
.hero { padding: 84px 0 64px; }
.hero-grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 56px; align-items: center; }
.hero h1 { font-size: 3.2rem; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 10px; }
.hero .role { font-size: 1.0rem; color: var(--muted); margin-bottom: 24px; }
.hero .role a { color: var(--muted); border-color: transparent; }
.hero .role a:hover { color: var(--amber); }
.hero-statement { font-size: 1.1rem; max-width: none; }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-block; padding: 9px 20px;
  font-size: 0.85rem; font-weight: 600; letter-spacing: 0.05em;
  color: var(--ink); background: transparent;
  border: 1.5px solid var(--ink); border-radius: 3px;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.btn:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.btn-accent { border-color: var(--amber); color: var(--amber); }
.btn.btn-accent:hover { background: var(--amber); color: #fff; }
.btn i { margin-right: 7px; }

.hero-portrait { text-align: center; }
.hero-portrait img {
  width: 100%; max-width: 320px;
  border-radius: 6px;
  border: 1px solid var(--hairline);
  filter: saturate(0.94);
}

/* ============================================================
   About me — text + summit photo
   ============================================================ */
.about-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 36px; align-items: center; }
.about-portrait img {
  width: 100%; display: block;
  border-radius: 6px;
  border: 1px solid var(--hairline);
  filter: saturate(0.96);
}

/* ============================================================
   Toolkit — two parallel tracks (rotation / magnetism), side by side
   ============================================================ */
.tracks-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: start; margin-top: 12px;
}
.track { max-width: 46em; }
.tracks-grid .track { max-width: none; }
.tracks-grid .track:last-child { border-left: 1px solid var(--hairline); padding-left: 64px; }
.track-label {
  display: block;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--amber);
  margin-bottom: 8px;
}
.track-figure { max-width: none; margin-top: 26px; }
.gif-media {
  display: block; width: 100%; height: auto;
  border-radius: 4px; border: 1px solid var(--hairline);
}

/* ============================================================
   Research program — table-of-contents cards (jump to sections)
   ============================================================ */
.toc-grid { margin: 34px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.toc-card {
  display: flex; align-items: flex-start; gap: 12px;
  background: var(--paper); border: 1px solid var(--hairline); border-radius: 8px;
  padding: 14px 18px; text-decoration: none; color: inherit;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.toc-card:hover, .toc-card:focus-visible {
  border-color: var(--amber); transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(176,90,14,0.10); outline: none;
}
.toc-card .toc-num {
  font-family: var(--serif); font-size: 1.3rem; font-weight: 400;
  color: var(--amber); line-height: 1.2; flex-shrink: 0;
}
.toc-card .toc-text { display: flex; flex-direction: column; gap: 3px; }
.toc-card .toc-title { font-family: var(--serif); font-weight: 600; font-size: 0.92rem; line-height: 1.35; color: var(--ink); }
.toc-card .toc-tech { font-family: var(--sans); font-style: italic; font-size: 0.76rem; color: var(--muted); }

/* ============================================================
   Research detail sections (formerly modals, now in-page)
   ============================================================ */
#stalling .pz-num, #fcb .pz-num, #wmb .pz-num {
  font-family: var(--serif); font-size: 1.7rem; font-weight: 400;
  color: var(--amber); line-height: 1; display: block; margin-bottom: 4px;
}
#stalling .approach, #fcb .approach, #wmb .approach { margin-top: 4px; }
#stalling .prose, #fcb .prose, #wmb .prose { max-width: none; }
#stalling .figure-card, #fcb .figure-card, #wmb .figure-card { background: #FFFFFF; }
.back-to-toc { margin-top: 32px; }
.back-to-toc a { font-size: 0.85rem; font-weight: 600; }

/* FCB section: summary + theory figures side by side at top, text below in normal flow */
.fcb-figures {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 28px; align-items: flex-start;
  margin: 4px 0 28px;
}
.fcb-figures .figure-card { text-align: center; }
.fcb-summary-fig, .fcb-theory-fig { max-width: 440px; }
.fcb-summary-fig img, .fcb-theory-fig img {
  display: block; max-width: 100%; height: auto; margin: 0 auto;
  border-radius: 4px;
}
.fcb-text { margin-top: 4px; }
.fcb-citation { margin-top: 24px; }
@media (max-width: 900px) {
  .fcb-figures { flex-direction: column; align-items: center; }
}

/* ============================================================
   Problem sections — approach chips
   ============================================================ */
.approach {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px;
  margin: 24px 0 8px;
}
.ap-item {
  border-left: 3px solid var(--amber);
  padding: 4px 0 4px 14px;
  font-size: 0.88rem; color: var(--ink-soft); line-height: 1.6;
}
.ap-item .ap-k {
  display: block;
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--amber);
  margin-bottom: 2px;
}

/* ============================================================
   Figure containers
   ============================================================ */
/* Dark panel — magnetic-field visuals */
.figure-panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 6px;
  padding: 24px 24px 20px;
  color: var(--panel-text);
}
.figure-panel h4 {
  color: var(--panel-text); font-family: var(--sans);
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 14px;
}
.figure-panel .smallnote { color: var(--panel-muted); }

/* Light card — paper-style charts */
.figure-card {
  background: #FFFFFF;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 24px 24px 18px;
}
.figure-card h4 {
  font-family: var(--sans);
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.figure-caption { font-size: 0.82rem; color: var(--muted); margin-top: 12px; line-height: 1.6; }

canvas.viz { display: block; width: 100%; height: auto; }

/* Placeholder for visuals awaiting data */
.map-placeholder {
  border: 1.5px dashed var(--panel-edge);
  border-radius: 6px;
  min-height: 220px;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  color: var(--panel-muted);
  font-size: 0.82rem; letter-spacing: 0.04em;
  padding: 24px;
}
.figure-card .map-placeholder, .placeholder-light {
  border-color: var(--hairline); color: var(--muted);
}

/* Chart tooltip */
.viz-tip {
  position: fixed; z-index: 300; pointer-events: none;
  background: var(--ink); color: var(--paper);
  font-size: 0.78rem; line-height: 1.5;
  padding: 7px 11px; border-radius: 4px;
  transform: translate(-50%, calc(-100% - 10px));
  opacity: 0; transition: opacity 0.12s;
  white-space: nowrap;
}
.viz-tip.on { opacity: 1; }
.viz-tip .t-name { font-weight: 600; color: var(--amber-soft); }

/* ============================================================
   Interactive controls
   ============================================================ */
.controls { display: flex; flex-wrap: wrap; gap: 20px 34px; align-items: center; margin: 14px 0 4px; }
.control { display: flex; align-items: center; gap: 10px; font-size: 0.8rem; color: var(--panel-muted); }
.control label { letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.7rem; font-weight: 600; }
.control output { font-family: var(--mono); font-size: 0.78rem; color: var(--panel-text); min-width: 3.2em; }
.control input[type="range"] { accent-color: var(--amber-soft); width: 130px; }

.ctl-btn {
  font-family: var(--sans); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  background: transparent; color: var(--panel-muted);
  border: 1px solid var(--panel-edge); border-radius: 3px;
  padding: 6px 14px; cursor: pointer; transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.ctl-btn:hover { color: var(--panel-text); border-color: var(--panel-muted); }
.ctl-btn.active { background: var(--amber-soft); border-color: var(--amber-soft); color: var(--panel); }

/* ============================================================
   ZDI explainer layout
   ============================================================ */
.zx-grid { display: grid; grid-template-columns: 250px 1fr; gap: 20px; align-items: center; }
@media (max-width: 700px) { .zx-grid { grid-template-columns: 1fr; justify-items: center; } }

/* ZDI explainer sits on a light card — override the dark-panel control colors */
#zdi-explainer .control { color: var(--muted); }
#zdi-explainer .control output { color: var(--ink); }
#zdi-explainer .control input[type="range"] { accent-color: var(--amber); }
#zdi-explainer .ctl-btn { color: var(--muted); border-color: var(--hairline); }
#zdi-explainer .ctl-btn:hover { color: var(--ink); border-color: var(--ink-soft); }
#zdi-explainer .ctl-btn.active { background: var(--amber); border-color: var(--amber); color: #fff; }

/* ============================================================
   Stalling section: chart left, star panel right
   ============================================================ */
.stall-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr;
  gap: 24px; align-items: stretch; margin-top: 28px;
}
.star-panel h3 { color: var(--panel-text); margin-bottom: 2px; font-size: 1.25rem; }
.star-panel .sd-sphere-wrap { text-align: center; margin: 12px 0 6px; }
.sd-season-switch {
  display: flex; align-items: center; gap: 10px;
  margin-top: 12px;
}
.sd-season-switch button {
  width: 26px; height: 26px; border-radius: 50%;
  border: 1px solid var(--panel-edge); background: transparent;
  color: var(--panel-muted); font-size: 1rem; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: color 0.15s, border-color 0.15s;
}
.sd-season-switch button:hover:not(:disabled) { color: var(--amber-soft); border-color: var(--amber-soft); }
.sd-season-switch button:disabled { opacity: 0.3; cursor: default; }
.sd-season-label {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--panel-muted); min-width: 8em; text-align: center;
}
.star-stats {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px;
  margin-top: 14px; border: 1px solid var(--panel-edge); border-radius: 4px; overflow: hidden;
}
.star-stat { background: rgba(255,255,255,0.03); padding: 9px 12px; }
.star-stat .v { font-family: var(--mono); font-size: 0.98rem; color: var(--amber-soft); display: block; }
.star-stat .k { font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--panel-muted); }
.sd-placeholder {
  width: 270px; height: 270px; margin: 0 auto;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px dashed var(--panel-edge); border-radius: 50%;
  color: var(--panel-muted); text-align: center;
  font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase;
}

/* ============================================================
   WMB section: tau Ceti figure, then two result-bullet columns
   ============================================================ */
.wmb-fig { text-align: center; max-width: 780px; margin: 0 auto; }
.wmb-fig img { display: block; max-width: 780px; width: 100%; height: auto; margin: 0 auto; border-radius: 4px; }
.wmb-results { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; margin-top: 32px; }
.wmb-results h3 { font-size: 1.08rem; margin-bottom: 12px; }
.result-list { list-style: none; padding: 0; margin: 0 0 14px; }
.result-list li {
  position: relative; padding-left: 20px; margin-bottom: 11px;
  font-size: 0.94rem; color: var(--ink-soft); line-height: 1.65;
}
.result-list li::before { content: "—"; position: absolute; left: 0; color: var(--amber); }
.wmb-results .paper-link { font-size: 0.85rem; font-weight: 600; }

/* ============================================================
   Background / teaching / photography / contact
   ============================================================ */
.teach-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 30px; }
.teach-block { border-top: 2px solid var(--ink); padding-top: 16px; }
.teach-block h3 { font-size: 1.05rem; }
.teach-block p, .teach-block li { font-size: 0.9rem; color: var(--ink-soft); }
.teach-block ul { padding-left: 18px; margin: 0; }
.teach-block li { margin-bottom: 6px; }

.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 30px; }
.gallery img {
  width: 100%; aspect-ratio: 5/4; object-fit: cover; border-radius: 4px;
  border: 1px solid var(--hairline);
  transition: transform 0.25s; user-select: none; -webkit-user-drag: none;
}
.gallery img:hover { transform: scale(1.02); }

.contact-block { text-align: center; }
.contact-block .icons { margin-top: 18px; display: flex; gap: 26px; justify-content: center; font-size: 1.5rem; }
.contact-block .icons a { border: none; color: var(--ink-soft); }
.contact-block .icons a:hover { color: var(--amber); }

footer {
  border-top: 1px solid var(--hairline);
  padding: 26px 0 34px; text-align: center;
  font-size: 0.8rem; color: var(--muted);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 940px) {
  .hero-grid, .stall-grid, .teach-grid, .approach,
  .tracks-grid, .wmb-results, .about-grid, .toc-grid { grid-template-columns: 1fr; }
  .tracks-grid .track:last-child {
    border-left: none; padding-left: 0;
    margin-top: 48px; padding-top: 44px; border-top: 1px solid var(--hairline);
  }
  .hero h1 { font-size: 2.5rem; }
  .hero-portrait { order: -1; }
  .hero-portrait img { max-width: 260px; }
  .about-portrait { order: -1; }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  section { padding: 60px 0; }
  .problem-row { grid-template-columns: 48px 1fr; gap: 14px; }
  .container { padding: 0 22px; }
}
@media (prefers-reduced-motion: reduce) {
  .gallery img:hover { transform: none; }
}