/* =========================================================
   MALROD — design tokens
   Concept: a thermal engineering journal. The cooling curve
   (Newton's law of cooling) is the signature motif — it is the
   one real chart that defines whether an isothermal container
   works, so it recurs as hero, divider and article ornament.
   ========================================================= */

:root{
  --ink:      #0B1D26;   /* deep cold blue-black — dark sections, footer */
  --paper:    #F7F9F8;   /* cool white — base background */
  --frost:    #E4EEF0;   /* pale ice tint — alternating sections, cards */
  --cold:     #1C7C93;   /* steel teal — primary accent, links, curve */
  --heat:     #E8622C;   /* amber — threshold marker, used sparingly */
  --graphite: #2B3A3F;   /* body text */
  --line:     #C7D6D9;   /* hairlines */
  --white:    #FFFFFF;

  --display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --body:    "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono:    "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --measure: 68ch;
  --radius: 3px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; }
}

body{
  margin:0;
  background:var(--paper);
  color:var(--graphite);
  font-family:var(--body);
  font-size:18px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:var(--display);
  color:var(--ink);
  line-height:1.15;
  letter-spacing:-0.01em;
  margin:0 0 0.5em;
}
h1{ font-size:clamp(2rem, 4vw, 3.2rem); font-weight:600; }
h2{ font-size:clamp(1.4rem, 2.4vw, 1.9rem); font-weight:600; margin-top:2.2em; }
h3{ font-size:1.2rem; font-weight:600; margin-top:1.6em; }

p{ margin:0 0 1.2em; }
a{ color:var(--cold); text-decoration-thickness:1px; text-underline-offset:3px; }
a:hover{ color:var(--heat); }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible{
  outline:2px solid var(--heat);
  outline-offset:3px;
}

::selection{ background:var(--cold); color:var(--white); }

/* ---------- layout shell ---------- */
.wrap{ max-width:1120px; margin:0 auto; padding:0 28px; }
.prose{ max-width:var(--measure); }

/* ---------- header ---------- */
.site-header{
  background:var(--ink);
  color:var(--frost);
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.site-header .wrap{
  display:flex; align-items:center; justify-content:space-between;
  padding-top:20px; padding-bottom:20px;
}
.brand{
  font-family:var(--display); font-weight:700; font-size:1.15rem;
  color:var(--white); text-decoration:none; letter-spacing:-0.02em;
  display:flex; align-items:baseline; gap:8px;
}
.brand small{
  font-family:var(--mono); font-weight:400; font-size:0.62rem;
  letter-spacing:0.12em; text-transform:uppercase; color:var(--cold);
}
.brand-logo{ height:34px; width:auto; display:block; }
.nav{ display:flex; gap:28px; list-style:none; margin:0; padding:0; }
.nav a{
  color:var(--frost); text-decoration:none; font-family:var(--display);
  font-size:0.92rem; font-weight:500; opacity:0.85;
}
.nav a:hover{ opacity:1; color:var(--heat); }

/* ---------- hero ---------- */
.hero{ background:var(--ink); color:var(--frost); position:relative; overflow:hidden; }
.hero .wrap{
  display:grid; grid-template-columns:1.05fr 1fr; gap:56px;
  align-items:center; padding-top:64px; padding-bottom:72px;
}
.hero-eyebrow{
  font-family:var(--mono); font-size:0.72rem; letter-spacing:0.16em;
  text-transform:uppercase; color:var(--cold); margin-bottom:18px; display:block;
}
.hero h1{ color:var(--white); }
.hero p.lede{
  font-family:var(--body); font-size:1.15rem; color:var(--frost);
  max-width:46ch; margin-top:18px; opacity:0.92;
}
.hero-actions{ margin-top:32px; display:flex; gap:16px; flex-wrap:wrap; }

.btn{
  display:inline-block; font-family:var(--display); font-weight:600;
  font-size:0.92rem; padding:12px 22px; border-radius:var(--radius);
  text-decoration:none; border:1px solid transparent; transition:transform .15s ease;
}
.btn:hover{ transform:translateY(-1px); }
.btn-primary{ background:var(--cold); color:var(--white); }
.btn-primary:hover{ background:#1a6f83; color:var(--white); }
.btn-ghost{ border-color:rgba(247,249,248,0.35); color:var(--frost); }
.btn-ghost:hover{ border-color:var(--heat); color:var(--heat); }

/* signature: annotated cooling-curve chart */
.curve-figure{ position:relative; }
.curve-figure svg{ width:100%; height:auto; display:block; }
.curve-caption{
  font-family:var(--mono); font-size:0.68rem; color:var(--cold);
  letter-spacing:0.04em; margin-top:10px; text-align:right;
}

/* thin dashed divider = the ATP threshold line motif, reused between sections */
.threshold-divider{
  border:none; border-top:1px dashed var(--line); margin:0;
  position:relative;
}
.threshold-divider::after{
  content:"—12°C"; position:absolute; right:28px; top:-9px;
  background:var(--paper); padding:0 8px; font-family:var(--mono);
  font-size:0.68rem; color:var(--cold);
}
.section-alt .threshold-divider::after{ background:var(--frost); }

/* ---------- sections ---------- */
section{ padding:64px 0; }
.section-alt{ background:var(--frost); }
.kicker{
  font-family:var(--mono); font-size:0.72rem; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--cold); margin-bottom:10px; display:block;
}

/* pillars / feature grid */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:32px; margin-top:36px; }
.pillar{
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius);
  padding:26px 24px;
}
.pillar .num{
  font-family:var(--mono); color:var(--heat); font-size:0.8rem; display:block; margin-bottom:10px;
}
.pillar h3{ margin-top:0; font-size:1.05rem; }
.pillar p{ font-size:0.95rem; color:var(--graphite); margin-bottom:0; }

/* ---------- journal-style article index ---------- */
.paper-list{ list-style:none; margin:36px 0 0; padding:0; }
.paper-item{
  display:grid; grid-template-columns:90px 1fr auto; gap:24px; align-items:start;
  padding:26px 0; border-bottom:1px solid var(--line);
}
.paper-item:first-child{ border-top:1px solid var(--line); }
.paper-id{ font-family:var(--mono); color:var(--heat); font-size:0.85rem; padding-top:4px; }
.paper-item h2{
  margin:0 0 8px; font-size:1.3rem; font-weight:600;
}
.paper-item h2 a{ color:var(--ink); text-decoration:none; }
.paper-item h2 a:hover{ color:var(--cold); }
.paper-summary{ color:var(--graphite); font-size:0.98rem; margin-bottom:8px; max-width:60ch; }
.paper-meta{
  font-family:var(--mono); font-size:0.72rem; color:#5c6f74; text-transform:uppercase; letter-spacing:0.06em;
}
.paper-tags{ font-family:var(--mono); font-size:0.72rem; color:var(--cold); text-align:right; white-space:nowrap; }

/* ---------- article ---------- */
.article-header{ background:var(--ink); color:var(--frost); padding:56px 0 44px; }
.article-header .kicker{ color:var(--cold); }
.article-header h1{ color:var(--white); }
.article-meta{
  font-family:var(--mono); font-size:0.78rem; color:var(--frost); opacity:0.85;
  display:flex; gap:18px; flex-wrap:wrap; margin-top:18px;
}
.article-body{ padding:52px 0 72px; }
.article-body h2{ border-top:1px dashed var(--line); padding-top:0.9em; }
.article-body blockquote{
  margin:1.8em 0; padding:4px 0 4px 22px; border-left:3px solid var(--heat);
  font-style:italic; color:var(--ink);
}
.article-body code{
  font-family:var(--mono); background:var(--frost); padding:2px 6px; border-radius:3px; font-size:0.88em;
}
.article-body pre{ background:var(--ink); color:var(--frost); padding:18px; border-radius:var(--radius); overflow-x:auto; }
.article-body pre code{ background:none; padding:0; color:inherit; }
.article-body table{ width:100%; border-collapse:collapse; margin:1.6em 0; font-size:0.95rem; }
.article-body th,.article-body td{ border:1px solid var(--line); padding:10px 12px; text-align:left; }
.article-body th{ font-family:var(--mono); font-size:0.75rem; text-transform:uppercase; letter-spacing:0.04em; background:var(--frost); }
.article-body figure{ margin:2em 0; }
.article-body figcaption{ font-family:var(--mono); font-size:0.72rem; color:#5c6f74; margin-top:8px; }
.article-body ul, .article-body ol{ padding-left:1.3em; }

.toc{
  background:var(--frost); border:1px solid var(--line); border-radius:var(--radius);
  padding:20px 24px; margin:0 0 40px; font-size:0.92rem;
}
.toc-title{ font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.1em; color:var(--cold); margin-bottom:8px; display:block; }
.toc ul{ margin:0; padding-left:1.1em; }

/* ---------- footer ---------- */
.site-footer{ background:var(--ink); color:var(--frost); padding:48px 0 36px; }
.footer-grid{ display:grid; grid-template-columns:1.3fr 1fr 1fr; gap:32px; }
.site-footer h4{ color:var(--white); font-size:0.85rem; text-transform:uppercase; letter-spacing:0.08em; }
.site-footer p, .site-footer a{ color:var(--frost); opacity:0.85; font-size:0.92rem; }
.site-footer a{ text-decoration:none; }
.site-footer a:hover{ color:var(--heat); opacity:1; }
.footer-bottom{
  margin-top:36px; padding-top:20px; border-top:1px solid rgba(255,255,255,0.1);
  font-family:var(--mono); font-size:0.72rem; opacity:0.6; display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px;
}

/* ---------- generic pages ---------- */
.page-header{ padding:56px 0 20px; }
.page-header .kicker{ display:block; }
.page-body{ padding:20px 0 72px; }

/* ---------- cookie consent banner ---------- */
.cookie-banner{
  position:fixed; left:0; right:0; bottom:0; z-index:100;
  background:var(--ink); color:var(--frost);
  border-top:1px solid rgba(255,255,255,0.12);
  box-shadow:0 -6px 24px rgba(0,0,0,0.25);
}
.cookie-banner[hidden]{ display:none; }
.cookie-banner-inner{
  max-width:1120px; margin:0 auto; padding:20px 28px;
  display:flex; align-items:center; justify-content:space-between; gap:28px; flex-wrap:wrap;
}
.cookie-banner-inner p{
  margin:0; font-family:var(--body); font-size:0.92rem; color:var(--frost);
  max-width:62ch; flex:1 1 320px;
}
.cookie-banner-inner a{ color:var(--cold); }
.cookie-banner-actions{ display:flex; gap:12px; flex-wrap:wrap; }
.btn-ghost-dark{
  border:1px solid rgba(247,249,248,0.3); color:var(--frost); background:transparent;
  font-family:var(--display); font-weight:600; font-size:0.88rem;
  padding:11px 18px; border-radius:var(--radius); cursor:pointer;
}
.btn-ghost-dark:hover{ border-color:var(--heat); color:var(--heat); }
#cookie-accept{ border:none; cursor:pointer; font-family:var(--display); }

/* ---------- cookie preferences modal ---------- */
.cookie-modal{ position:fixed; inset:0; z-index:200; }
.cookie-modal[hidden]{ display:none; }
.cookie-modal-backdrop{
  position:absolute; inset:0; background:rgba(11,29,38,0.6);
}
.cookie-modal-dialog{
  position:relative; z-index:1; background:var(--paper); color:var(--graphite);
  max-width:560px; margin:8vh auto 0; border-radius:6px; overflow:hidden;
  box-shadow:0 20px 60px rgba(0,0,0,0.35);
  max-height:82vh; display:flex; flex-direction:column;
}
.cookie-modal-header{
  display:flex; align-items:center; justify-content:space-between;
  padding:20px 24px; background:var(--ink); color:var(--white);
}
.cookie-modal-header h2{ color:var(--white); font-size:1.15rem; margin:0; }
.cookie-modal-close{
  background:none; border:none; color:var(--frost); font-size:1.6rem; line-height:1;
  cursor:pointer; padding:0 4px;
}
.cookie-modal-close:hover{ color:var(--heat); }
.cookie-modal-body{ padding:24px; overflow-y:auto; }
.cookie-modal-body > p{ font-size:0.92rem; color:var(--graphite); }
.cookie-category{ border-top:1px solid var(--line); padding:18px 0; }
.cookie-category:first-of-type{ border-top:none; padding-top:6px; }
.cookie-category-head{ display:flex; align-items:center; justify-content:space-between; gap:16px; }
.cookie-category-name{ font-family:var(--display); font-weight:600; font-size:0.98rem; color:var(--ink); }
.cookie-category-desc{ font-size:0.88rem; color:#4c5c60; margin:8px 0 0; }
.cookie-modal-footer{
  display:flex; justify-content:flex-end; gap:12px; padding:18px 24px;
  border-top:1px solid var(--line); background:var(--frost);
}

/* toggle switch */
.cookie-toggle{ position:relative; display:inline-flex; cursor:pointer; }
.cookie-toggle input{ position:absolute; opacity:0; width:1px; height:1px; }
.cookie-toggle-track{
  width:42px; height:24px; background:#B9C7CA; border-radius:99px; position:relative;
  transition:background .15s ease; display:block;
}
.cookie-toggle-thumb{
  position:absolute; top:3px; left:3px; width:18px; height:18px; border-radius:50%;
  background:var(--white); transition:transform .15s ease;
}
.cookie-toggle input:checked + .cookie-toggle-track{ background:var(--cold); }
.cookie-toggle input:checked + .cookie-toggle-track .cookie-toggle-thumb{ transform:translateX(18px); }
.cookie-toggle input:focus-visible + .cookie-toggle-track{ outline:2px solid var(--heat); outline-offset:2px; }
.cookie-toggle-disabled{ cursor:default; opacity:0.65; }

@media (max-width:640px){
  .cookie-modal-dialog{ margin:0; max-width:none; height:100%; max-height:100%; border-radius:0; }
}

@media (max-width:640px){
  .cookie-banner-inner{ flex-direction:column; align-items:stretch; }
  .cookie-banner-actions{ justify-content:stretch; }
  .cookie-banner-actions .btn{ flex:1; text-align:center; }
}

/* ---------- newsletter (Mailchimp) ---------- */
.newsletter{
  background:var(--ink); color:var(--frost); border-radius:var(--radius);
  padding:40px 36px; margin-top:8px;
}
.newsletter h3{ color:var(--white); margin-top:0; }
.newsletter p{ color:var(--frost); opacity:0.85; max-width:52ch; }
.newsletter-form{ display:flex; gap:12px; flex-wrap:wrap; margin-top:20px; }
.newsletter-form input[type="email"]{
  flex:1 1 260px; padding:12px 16px; border-radius:var(--radius);
  border:1px solid rgba(247,249,248,0.3); background:rgba(247,249,248,0.06);
  color:var(--white); font-family:var(--body); font-size:1rem;
}
.newsletter-form input[type="email"]::placeholder{ color:rgba(247,249,248,0.5); }
.newsletter-form button{ border:none; cursor:pointer; }
.newsletter-note{
  font-family:var(--mono); font-size:0.7rem; color:rgba(247,249,248,0.55);
  margin-top:12px; margin-bottom:0;
}
.mc-honeypot{ position:absolute; left:-5000px; } /* Mailchimp anti-spam field, must stay in the DOM but hidden from real users */
.newsletter-checkbox{
  display:flex; align-items:flex-start; gap:10px; margin-top:14px;
  font-size:0.85rem; color:var(--frost); opacity:0.9; cursor:pointer;
}
.newsletter-checkbox input{ margin-top:3px; flex-shrink:0; }
.sr-only{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
@media (max-width: 860px){
  .hero .wrap{ grid-template-columns:1fr; padding-top:44px; padding-bottom:48px; }
  .grid-3{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr; }
  .paper-item{ grid-template-columns:56px 1fr; }
  .paper-tags{ grid-column:2 / 3; text-align:left; }
  .nav{ gap:16px; }
}
@media (max-width: 560px){
  body{ font-size:16.5px; }
  .site-header .wrap{ flex-direction:column; gap:14px; align-items:flex-start; }
}