/* =====================================================================
   Lekić Lab — shared design system
   Every page and component MUST use these tokens (never hard-code colors).
   Dark is the default theme; [data-theme="light"] on <html> switches.
   ===================================================================== */

:root {
  /* surfaces */
  --bg: #06080e;
  --bg-2: #0a0e17;
  --surface: #10151f;
  --surface-2: #161d2b;
  --surface-3: #1d2638;
  --line: rgba(255, 255, 255, 0.07);
  --line-strong: rgba(255, 255, 255, 0.15);
  --glass: rgba(10, 14, 23, 0.72);

  /* text */
  --text: #eaeef6;
  --text-2: #a9b2c4;
  --text-3: #6d7891;

  /* brand */
  --accent: #ff7a45;     /* magma — deep Earth, primary */
  --accent-2: #4cc9f0;   /* seismic cyan — waves, links */
  --accent-3: #b794f6;   /* planetary violet */
  --gold: #f2c46d;       /* honors */
  --accent-glow: rgba(255, 122, 69, 0.35);
  --accent-2-glow: rgba(76, 201, 240, 0.3);
  --on-accent: #120a06;

  /* topic colors (used by .chip[data-topic]) */
  --t-deep-earth: #ff8a3d;
  --t-mars: #e5484d;
  --t-moon: #cfd8e3;
  --t-icy-worlds: #7dd3fc;
  --t-lithosphere: #6ee7b7;
  --t-earthquakes: #fbbf24;
  --t-methods: #b794f6;
  --t-humanitarian: #f472b6;

  /* type */
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  /* shape & motion */
  --r-sm: 8px;
  --r: 14px;
  --r-lg: 22px;
  --shadow: 0 1px 0 rgba(255,255,255,0.04) inset, 0 20px 50px -20px rgba(0,0,0,0.6);
  --ease: cubic-bezier(.2,.7,.2,1);
  --maxw: 1200px;
  --nav-h: 68px;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f6f4ef;
  --bg-2: #efece4;
  --surface: #ffffff;
  --surface-2: #f8f6f1;
  --surface-3: #efebe2;
  --line: rgba(20, 24, 33, 0.09);
  --line-strong: rgba(20, 24, 33, 0.18);
  --glass: rgba(246, 244, 239, 0.8);
  --text: #121620;
  --text-2: #475064;
  --text-3: #7a8396;
  --accent: #d4521c;
  --accent-2: #0b7fae;
  --accent-3: #7c4dd6;
  --gold: #a87717;
  --accent-glow: rgba(212, 82, 28, 0.2);
  --accent-2-glow: rgba(11, 127, 174, 0.18);
  --on-accent: #ffffff;
  --t-deep-earth: #d9650f;
  --t-mars: #c4262e;
  --t-moon: #5b6576;
  --t-icy-worlds: #0b7fae;
  --t-lithosphere: #12855f;
  --t-earthquakes: #b07c08;
  --t-methods: #7c4dd6;
  --t-humanitarian: #c0367f;
  --shadow: 0 1px 2px rgba(20,24,33,0.06), 0 18px 40px -22px rgba(20,24,33,0.28);
  color-scheme: light;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, canvas, video { max-width: 100%; display: block; }
a { color: var(--accent-2); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--text); }
p { margin: 0 0 1em; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; line-height: 1.12; margin: 0 0 .5em; letter-spacing: -0.015em; color: var(--text); }
h1 { font-size: clamp(2.4rem, 5.6vw, 4.6rem); font-weight: 400; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.8rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.2rem, 1.8vw, 1.5rem); }
h4 { font-size: 1.05rem; font-family: var(--font-body); font-weight: 600; letter-spacing: 0; }
em.display, .display-em { font-style: italic; color: var(--accent); }
::selection { background: var(--accent); color: var(--on-accent); }
:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; border-radius: 4px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }

/* ---------- layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 820px; }
.section { padding: clamp(64px, 9vw, 120px) 0; position: relative; }
.section.tight { padding: clamp(40px, 6vw, 72px) 0; }
.section.alt { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 760px; margin-bottom: clamp(32px, 5vw, 56px); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p:not(.eyebrow) { color: var(--text-2); font-size: 1.1rem; }
.grid { display: grid; gap: 24px; }
.grid-2 { display: grid; gap: 24px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { display: grid; gap: 24px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { display: grid; gap: 20px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 960px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } .container { padding: 0 16px; } }

/* ---------- small type ---------- */
.eyebrow {
  font-family: var(--font-mono); font-size: .74rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent-2); display: inline-flex; align-items: center; gap: .6em; margin-bottom: 1rem;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; opacity: .7; }
.lead { font-size: clamp(1.1rem, 1.6vw, 1.3rem); color: var(--text-2); line-height: 1.6; }
.muted { color: var(--text-2); }
.faint { color: var(--text-3); }
.mono { font-family: var(--font-mono); font-size: .88em; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.gradient-text {
  background: linear-gradient(100deg, var(--accent) 0%, var(--gold) 45%, var(--accent-2) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55em; padding: .8em 1.35em; border-radius: 999px;
  font: 600 .95rem/1 var(--font-body); border: 1px solid var(--line-strong); color: var(--text);
  background: transparent; cursor: pointer; transition: transform .25s var(--ease), background .25s, border-color .25s, color .25s, box-shadow .25s;
}
.btn:hover { transform: translateY(-2px); border-color: var(--text-2); color: var(--text); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); box-shadow: 0 10px 30px -10px var(--accent-glow); }
.btn-primary:hover { color: var(--on-accent); box-shadow: 0 14px 36px -10px var(--accent-glow); border-color: var(--accent); }
.btn-ghost { background: var(--surface); }
.btn-sm { padding: .55em 1em; font-size: .85rem; }
.btn svg { width: 1.05em; height: 1.05em; }

/* ---------- cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: clamp(20px, 2.5vw, 30px); box-shadow: var(--shadow); position: relative;
  transition: transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}
a.card, .card.hoverable { color: inherit; display: block; }
a.card:hover, .card.hoverable:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.card h3 { margin-bottom: .35em; }
.card p:last-child { margin-bottom: 0; }

/* ---------- chips / tags ---------- */
.chip {
  --c: var(--text-2);
  display: inline-flex; align-items: center; gap: .45em; padding: .28em .75em; border-radius: 999px;
  font: 500 .76rem/1.4 var(--font-mono); letter-spacing: .02em; color: var(--c);
  background: color-mix(in srgb, var(--c) 12%, transparent); border: 1px solid color-mix(in srgb, var(--c) 28%, transparent);
  white-space: nowrap;
}
.chip::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--c); }
.chip.plain::before { display: none; }
button.chip { cursor: pointer; }
button.chip[aria-pressed="true"] { background: var(--c); color: var(--bg); }
.chip[data-topic="deep-earth"] { --c: var(--t-deep-earth); }
.chip[data-topic="mars"] { --c: var(--t-mars); }
.chip[data-topic="moon"] { --c: var(--t-moon); }
.chip[data-topic="icy-worlds"] { --c: var(--t-icy-worlds); }
.chip[data-topic="lithosphere"] { --c: var(--t-lithosphere); }
.chip[data-topic="earthquakes"] { --c: var(--t-earthquakes); }
.chip[data-topic="methods"] { --c: var(--t-methods); }
.chip[data-topic="humanitarian"] { --c: var(--t-humanitarian); }
.chip.gold { --c: var(--gold); }

/* ---------- navigation (rendered by site.js) ---------- */
.site-nav {
  position: fixed; inset: 0 0 auto 0; height: var(--nav-h); z-index: 100;
  display: flex; align-items: center; transition: background .3s, border-color .3s, backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}
.site-nav.scrolled, .site-nav.solid { background: var(--glass); backdrop-filter: blur(14px) saturate(1.4); -webkit-backdrop-filter: blur(14px) saturate(1.4); border-bottom-color: var(--line); }
.site-nav .container { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--text); font-family: var(--font-display); font-size: 1.2rem; letter-spacing: -0.01em; }
.brand:hover { color: var(--text); }
.brand svg { width: 34px; height: 22px; color: var(--accent); }
.brand small { display: block; font: 500 .62rem/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); margin-top: 3px; }
.nav-links { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--text-2); font-size: .9rem; font-weight: 500; padding: .5em .8em; border-radius: 999px; transition: color .2s, background .2s; }
.nav-links a:hover { color: var(--text); background: var(--surface-2); }
.nav-links a[aria-current="page"] { color: var(--text); background: var(--surface-2); }
.nav-links a.nav-cta { color: var(--on-accent); background: var(--accent); margin-left: 8px; padding: .5em 1.05em; }
.nav-links a.nav-cta:hover { filter: brightness(1.08); }
.nav-tools { display: flex; align-items: center; gap: 6px; }
.icon-btn { width: 38px; height: 38px; display: inline-grid; place-items: center; border-radius: 50%; border: 1px solid var(--line); background: transparent; color: var(--text-2); cursor: pointer; transition: color .2s, border-color .2s; }
.icon-btn:hover { color: var(--text); border-color: var(--line-strong); }
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn.attn { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.nav-toggle { display: none; }
@media (max-width: 1020px) {
  .nav-toggle { display: inline-grid; }
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0;
    padding: 12px 16px 20px; background: var(--bg); border-bottom: 1px solid var(--line);
    transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s var(--ease);
  }
  .site-nav.open .nav-links { opacity: 1; transform: none; pointer-events: auto; }
  .site-nav.open { background: var(--bg); }
  .nav-links a { padding: .85em 1em; font-size: 1rem; }
  .nav-links a.nav-cta { margin: 8px 0 0; text-align: center; }
}

/* ---------- sub-page hero ---------- */
.page-hero { position: relative; padding: calc(var(--nav-h) + clamp(56px, 9vw, 110px)) 0 clamp(40px, 6vw, 72px); overflow: hidden; }
.page-hero h1 { max-width: 16ch; }
.page-hero .lead { max-width: 62ch; }
.page-hero::before { /* soft glow */
  content: ""; position: absolute; width: 900px; height: 900px; right: -300px; top: -480px; border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 62%); opacity: .55; pointer-events: none;
}
.page-hero::after { /* faint grid */
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px; mask-image: radial-gradient(ellipse at 70% 0%, #000 0%, transparent 65%); -webkit-mask-image: radial-gradient(ellipse at 70% 0%, #000 0%, transparent 65%);
}
.page-hero > .container { position: relative; z-index: 1; }
.seismo-line { position: absolute; left: 0; right: 0; bottom: 0; height: 80px; z-index: 0; opacity: .6; color: var(--accent-2); pointer-events: none; }
.seismo-line path { stroke-dasharray: 3000; stroke-dashoffset: 3000; animation: draw-seismo 4.5s var(--ease) .3s forwards; }
@keyframes draw-seismo { to { stroke-dashoffset: 0; } }

/* ---------- stats ---------- */
.stat { display: flex; flex-direction: column; gap: .2rem; }
.stat .num { font-family: var(--font-display); font-size: clamp(2.2rem, 4vw, 3.4rem); line-height: 1; letter-spacing: -0.03em; color: var(--text); }
.stat .label { font: 500 .78rem/1.3 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); }

/* ---------- avatar ---------- */
.avatar { border-radius: 50%; object-fit: cover; background: var(--surface-3); aspect-ratio: 1; }
.avatar-fallback { display: grid; place-items: center; font-family: var(--font-display); color: var(--text-2); background: linear-gradient(135deg, var(--surface-3), var(--surface-2)); }

/* ---------- publication item (shared look) ---------- */
.pub { padding: 18px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 72px 1fr; gap: 16px; }
.pub .pub-year { font: 500 .85rem/1.6 var(--font-mono); color: var(--text-3); }
.pub .pub-title { font-weight: 600; color: var(--text); line-height: 1.4; margin-bottom: .25rem; }
.pub .pub-authors { color: var(--text-2); font-size: .93rem; }
.pub .pub-authors .me { color: var(--text); font-weight: 600; }
.pub .pub-authors .group { text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
.pub .pub-venue { font-style: italic; color: var(--text-2); font-size: .93rem; }
.pub .pub-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: .5rem; }
@media (max-width: 640px) { .pub { grid-template-columns: 1fr; gap: 4px; } }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 56px 0 40px; background: var(--bg-2); color: var(--text-2); font-size: .92rem; }
.site-footer .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
@media (max-width: 960px) { .site-footer .footer-grid { grid-template-columns: 1fr 1fr; } }
.site-footer h4 { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); margin-bottom: 1rem; font-weight: 500; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .45rem; }
.site-footer a { color: var(--text-2); }
.site-footer a:hover { color: var(--text); }
.site-footer .fineprint { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; color: var(--text-3); font-size: .8rem; }
@media (max-width: 760px) { .site-footer .footer-grid { grid-template-columns: 1fr; } }

/* ---------- scroll reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .9s var(--ease), transform .9s var(--ease); transition-delay: var(--d, 0ms); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal="fade"] { transform: none; }
[data-reveal="scale"] { transform: scale(.96); }

.static [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }

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

/* ---------- misc ---------- */
.verify-flag { /* marks facts the PI should double-check; hidden unless ?verify in URL */
  display: none;
}
body.show-verify .verify-flag { display: inline-block; font: 600 .65rem/1 var(--font-mono); color: #111; background: #fde047; padding: 3px 5px; border-radius: 4px; margin-left: 6px; vertical-align: middle; }
.divider-wave { color: var(--line-strong); width: 100%; height: 40px; }
.kbd { font: 500 .78rem var(--font-mono); padding: .1em .45em; border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 5px; color: var(--text-2); }