/* chrome.css (outer chrome + reusable modules)
   RULE: No literal colours in this file. Tokens only.
*/

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

html, body { height: 100%; margin: 0; padding: 0; }

/* Prevent “collapsing” layouts on very narrow windows */
html { min-width: 320px; }
body { min-width: 320px; }

body{
  font-family: var(--dm-font-sans);

  /* Smooth warm outer chrome (no banding/blocks). */
  background:
    radial-gradient(1400px 900px at 18% -14%,
      var(--dm-stage-glow-warm) 0%,
      transparent 60%),
    radial-gradient(1100px 820px at 88% -10%,
      var(--dm-stage-glow-teal) 0%,
      transparent 66%),
    radial-gradient(900px 900px at 50% 120%,
      var(--dm-stage-glow-warm-2) 0%,
      transparent 68%),
    linear-gradient(180deg,
      var(--dm-stage-bg-raise) 0%,
      var(--dm-stage-bg) 46%,
      var(--dm-stage-bg) 78%,
      var(--dm-stage-bg-deep) 100%);

  background-attachment: fixed;
  color: var(--dm-text-on-stage);
  line-height: var(--dm-lh-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.15em; }

::selection { background: var(--dm-selection-bg); color: var(--dm-selection-fg); }
:focus-visible{
  outline: 0.16rem solid var(--dm-focus-ring);
  outline-offset: 0.16rem;
  border-radius: var(--dm-radius-sm);
}

.skip-link{
  position:absolute;
  left:-9999px;
  top:var(--dm-space-3);
  padding: var(--dm-space-2) var(--dm-space-3);
  background: var(--dm-paper);
  color: var(--dm-text-on-paper);
  border-radius: var(--dm-radius-sm);
  box-shadow: var(--dm-shadow-2);
  z-index: 999;
}
.skip-link:focus{ left: var(--dm-space-3); }

.outer-chrome{
  min-height:100%;
  display:flex;
  flex-direction:column;
}

.container{
  width: min(var(--dm-maxw), calc(100% - (var(--dm-space-6) * 2)));
  margin: 0 auto;
}
@media (max-width:760px){
  .container{ width: calc(100% - (var(--dm-space-5) * 2)); }
}

/* ===== Header ===== */
.site-header{
  position: sticky;
  top:0;
  z-index:50;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--dm-stage-border);
  background: linear-gradient(180deg, var(--dm-stage-bg-raise), var(--dm-stage-bg));
}

/* Topbar layout: never collide; nav collapses into drawer. */
.topbar{
  height: var(--dm-topbar-h);
  display:flex;
  align-items:center;
  position: relative; /* anchor for elements */
}

.topbar-inner{
  display:grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items:center;
  gap: var(--dm-space-3);
  width:100%;
}

.brand{
  min-width: 0;
  display:flex;
  flex-direction:column;
  gap:1px;
}
.brand a{
  color: var(--dm-text-on-stage);
  font-weight: 760;
  font-size: var(--dm-text-md);
  letter-spacing: 0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand small{
  color: var(--dm-muted-on-stage);
  font-size: var(--dm-text-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Desktop nav */
.nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap: var(--dm-space-2);
  flex-wrap: nowrap;
  min-width: 0;
}
.nav a{
  color: var(--dm-muted-on-stage);
  font-size: var(--dm-text-sm);
  padding: 8px 10px;
  border-radius: var(--dm-radius-sm);
  white-space: nowrap;
}
.nav a[aria-current="page"]{
  color: var(--dm-text-on-stage);
  background: var(--dm-btn-ghost-bg);
  border: 1px solid var(--dm-btn-ghost-border);
}

/* CTA */
.header-cta{
  display:flex;
  align-items:center;
  gap: var(--dm-space-2);
  justify-content:flex-end;
  white-space: nowrap;
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  font-weight:650;
  font-size: var(--dm-text-sm);
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor:pointer;
  user-select:none;
  line-height:1;
  text-decoration:none;
}
.btn--primary{
  background: var(--dm-btn-primary-bg);
  color: var(--dm-btn-primary-fg);
  border-color: var(--dm-btn-primary-border);
  box-shadow: var(--dm-shadow-1);
}
.btn--ghost{
  background: var(--dm-btn-ghost-bg);
  color: var(--dm-btn-ghost-fg);
  border-color: var(--dm-btn-ghost-border);
}

/* Mobile menu toggle (hidden on desktop) */
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid var(--dm-btn-ghost-border);
  background: var(--dm-btn-ghost-bg);
  color: var(--dm-btn-ghost-fg);
  cursor:pointer;
  padding: 0;
}
.nav-toggle-icon{
  width: 18px;
  height: 12px;
  display:block;
  background:
    linear-gradient(var(--dm-text-on-stage), var(--dm-text-on-stage)) 0 0 / 100% 2px no-repeat,
    linear-gradient(var(--dm-text-on-stage), var(--dm-text-on-stage)) 0 50% / 100% 2px no-repeat,
    linear-gradient(var(--dm-text-on-stage), var(--dm-text-on-stage)) 0 100% / 100% 2px no-repeat;
  opacity: 0.9;
}

/* Backdrop: only used on mobile nav open */
.nav-backdrop{
  display:none;
  position: fixed;
  inset: 0;
  top: var(--dm-topbar-h);
  z-index: 55;
  background: var(--dm-btn-ghost-bg);
  backdrop-filter: blur(8px);
}
html.nav-open .nav-backdrop{ display:block; }

/* ===== Responsive header behavior =====
   At <900px: nav becomes a proper drawer, toggle appears.
*/
@media (max-width: 900px){
  .nav-toggle{ display:inline-flex; }

  /* Drawer nav (hidden by default, animated in) */
  .nav{
    display:flex;
    position: fixed;
    left: var(--dm-space-5);
    right: var(--dm-space-5);
    top: calc(var(--dm-topbar-h) + var(--dm-space-3));
    z-index: 60;

    flex-direction: column;
    align-items: stretch;
    gap: var(--dm-space-2);

    padding: var(--dm-space-3);
    border-radius: var(--dm-radius-lg);
    border: 1px solid var(--dm-stage-border);
    background: linear-gradient(180deg, var(--dm-stage-bg-raise), var(--dm-stage-bg));
    box-shadow: var(--dm-shadow-2);

    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
  }

  .nav a{
    padding: 12px 12px;
    border-radius: var(--dm-radius-md);
    border: 1px solid var(--dm-btn-ghost-border);
    background: var(--dm-btn-ghost-bg);
  }

  html.nav-open .nav{
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  /* CTA: tighten a touch */
  .btn{ padding: 10px 12px; }
}

/* At very small widths: allow CTA to wrap underneath if needed */
@media (max-width: 420px){
  .topbar{ height: auto; padding: var(--dm-space-2) 0; }
  .topbar-inner{
    grid-template-columns: 1fr auto;
    grid-auto-rows: auto;
    gap: var(--dm-space-2);
  }
  .header-cta{
    grid-column: 1 / -1;
    justify-content: flex-start;
    flex-wrap: wrap;
  }
}

/* ===== Main + centre stage ===== */
.site-main{
  flex:1;
  padding: var(--dm-space-7) 0 var(--dm-space-8);
}

.centre-stage{
  background: var(--dm-paper);
  color: var(--dm-text-on-paper);
  border: 1px solid var(--dm-paper-border);
  border-radius: var(--dm-radius-lg);
  box-shadow: var(--dm-shadow-2);
  min-height: calc(100vh - (var(--dm-topbar-h) + 200px));
}

.stage-inner{
  padding: var(--dm-space-7);
}
@media (max-width:760px){
  .stage-inner{ padding: var(--dm-space-6); }
}

/* Default typography inside stage */
.centre-stage h1{
  margin: 0 0 var(--dm-space-3);
  font-size: var(--dm-text-3xl);
  line-height: var(--dm-lh-tight);
  letter-spacing: -0.02em;
}
.centre-stage p{
  margin: 0 0 var(--dm-space-4);
  font-size: var(--dm-text-md);
  line-height: var(--dm-lh-relaxed);
  color: var(--dm-muted-on-paper);
}
.lead{
  font-size: var(--dm-text-lg);
  color: var(--dm-text-on-paper);
}
.muted{ color: var(--dm-muted-on-paper); }

.centre-stage a{ color: var(--dm-link); }
.centre-stage a:hover{ color: var(--dm-link-hover); }

/* ===== Reusable insert helpers ===== */
.actions{
  display:flex;
  gap: var(--dm-space-3);
  flex-wrap: wrap;
}

.kicker{
  font-family: var(--dm-font-mono);
  font-size: var(--dm-text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dm-muted-on-paper);
  margin: 0 0 var(--dm-space-2);
}
.rule{
  height:1px;
  background: var(--dm-paper-border);
  margin: var(--dm-space-6) 0;
}

/* Highlights */
.hl-yellow{ box-shadow: inset 0 -0.em 0 0 var(--dm-accent-yellow); }
.hl-teal{   box-shadow: inset 0 -0.35em 0 0 var(--dm-accent-teal); }

/* Receipts block */
.receipts{
  border: 1px solid var(--dm-paper-border);
  background: var(--dm-paper-2);
  border-radius: var(--dm-radius-md);
  padding: var(--dm-space-5);
  position: relative;
}
.receipts::before{
  content:"";
  position:absolute;
  left:0;
  top: var(--dm-space-4);
  bottom: var(--dm-space-4);
  width:4px;
  border-radius:999px;
  background: var(--dm-accent-teal);
}
.receipts p{ margin:0 0 var(--dm-space-2); color: var(--dm-text-on-paper); }
.receipts small{ color: var(--dm-muted-on-paper); }

/* Control rail */
.rail-line{
  display:grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--dm-space-2);
  padding: var(--dm-space-3);
  border: 1px solid var(--dm-paper-border);
  background: var(--dm-paper-2);
  border-radius: var(--dm-radius-md);
}
@media (max-width:760px){
  .rail-line{ grid-template-columns: 1fr; }
}

.rail-node{
  position:relative;
  display:flex;
  align-items:center;
  gap: var(--dm-space-2);
  padding: 10px 12px;
  border-radius: var(--dm-radius-sm);
  border: 1px solid transparent;
  background: transparent;
  cursor: default;
  color: var(--dm-text-on-paper);
  font-size: var(--dm-text-sm);
  font-weight: 650;
}
.rail-dot{
  width:10px;
  height:10px;
  border-radius:999px;
  background: var(--dm-text-on-paper);
  opacity:0.9;
}
.rail-node:hover{ border-color: var(--dm-paper-border); }
.rail-node[data-tip]:hover::after{
  content: attr(data-tip);
  position:absolute;
  left:0;
  top: calc(100% + 10px);
  width: min(44ch, 90vw);
  background: var(--dm-paper);
  color: var(--dm-text-on-paper);
  border: 1px solid var(--dm-paper-border);
  border-radius: var(--dm-radius-md);
  box-shadow: var(--dm-shadow-1);
  padding: var(--dm-space-3);
  font-weight: 450;
  font-size: var(--dm-text-sm);
  line-height: var(--dm-lh-relaxed);
  z-index: 10;
}

/* Two lanes */
.lanes{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--dm-space-5);
}
@media (max-width:860px){
  .lanes{ grid-template-columns: 1fr; }
}

.card{
  border: 1px solid var(--dm-paper-border);
  background: var(--dm-paper-2);
  border-radius: var(--dm-radius-md);
  padding: var(--dm-space-6);
}
.card h3{
  margin:0 0 var(--dm-space-2);
  font-size: var(--dm-text-xl);
  line-height: var(--dm-lh-tight);
}
.card p{
  margin:0 0 var(--dm-space-4);
  color: var(--dm-muted-on-paper);
  line-height: var(--dm-lh-relaxed);
}

.list{
  margin:0 0 var(--dm-space-4);
  padding:0;
  list-style:none;
  display:grid;
  gap: var(--dm-space-2);
}
.list li{
  display:flex;
  gap: var(--dm-space-2);
  align-items:flex-start;
  color: var(--dm-text-on-paper);
}
.bullet{
  width:6px;
  height:6px;
  border-radius:999px;
  background: var(--dm-accent-teal);
  margin-top: 0.55em;
  flex: 0 0 auto;
}

/* Book module */
.book{
  display:grid;
  grid-template-columns: 140px 1fr;
  gap: var(--dm-space-5);
  align-items:center;
  border: 1px solid var(--dm-paper-border);
  background: var(--dm-paper-2);
  border-radius: var(--dm-radius-md);
  padding: var(--dm-space-6);
}
@media (max-width:760px){
  .book{ grid-template-columns: 1fr; }
}
.book img{
  width:140px;
  height:auto;
  border-radius: var(--dm-radius-sm);
  border: 1px solid var(--dm-paper-border);
  display:block;
}

/* ===== Footer ===== */
.site-footer{
  padding: 0 0 var(--dm-space-6);
}

.footer-inner{
  border-top: 1px solid var(--dm-stage-border);
  margin-top: var(--dm-space-6);
  padding-top: var(--dm-space-5);
  display:flex;
  gap: var(--dm-space-6);
  align-items:flex-start;
  justify-content:space-between;
  flex-wrap:wrap;
}

.footer-links{
  display:flex;
  gap: var(--dm-space-2);
  flex-wrap:wrap;
}
.footer-links a{
  color: var(--dm-muted-on-stage);
  font-size: var(--dm-text-sm);
  padding: 6px 8px;
  border-radius: var(--dm-radius-sm);
}
.footer-links a:hover{
  color: var(--dm-text-on-stage);
}

.footer-meta{
  color: var(--dm-muted-on-stage);
  font-size: var(--dm-text-xs);
  max-width: 60ch;
}


/* --- Sticky header anchor offset --- */
:root{
  /* tweak these until it feels perfect */
  --anchor-offset: 96px;
}

/* usually the header is a bit shorter on mobile */
@media (max-width: 899px){
  :root{ --anchor-offset: 84px; }
}

/* when the browser scrolls to a hash target, keep this much room at the top */
html{
  scroll-padding-top: var(--anchor-offset);
}

/* ensure elements with ids don't get hidden under the sticky header */
[id]{
  scroll-margin-top: var(--anchor-offset);
}