/* styles.css — The Visual Noise Index™
   Calm, print-friendly editorial layout. No placeholder copy. */

:root{
  --paper: #fbfaf7;
  --paper-2:#f7f4ef;
  --ink: #1f2937;
  --muted:#5b6b83;
  --border:#d6d2cb;

  --teal:#3b8f83;      /* dusty teal */
  --coral:#d06b5a;     /* coral */
  --mustard:#caa24a;   /* mustard */
  --peri:#5b79c9;      /* periwinkle */

  --radius: 18px;
  --radius-sm: 14px;

  --shadow: 0 1px 0 rgba(31,41,55,.06), 0 8px 24px rgba(31,41,55,.08);

  --wrap: 980px;
  --gutter: clamp(16px, 4vw, 28px);
  --space-1: 10px;
  --space-2: 14px;
  --space-3: 18px;
  --space-4: 26px;
  --space-5: 36px;
  --space-6: 48px;

  --fz-0: 0.92rem;
  --fz-1: 1rem;
  --fz-2: 1.15rem;
  --fz-3: 1.35rem;
  --fz-4: 1.8rem;
  --fz-5: 2.35rem;

  --lh: 1.55;
}

*{ box-sizing:border-box; }

html, body{ height:100%; }

body{
  margin:0;
  color:var(--ink);
  background:
    radial-gradient(1200px 800px at 10% -10%, rgba(91,121,201,.10), transparent 60%),
    radial-gradient(900px 700px at 110% 10%, rgba(59,143,131,.10), transparent 55%),
    radial-gradient(900px 700px at 20% 120%, rgba(208,107,90,.10), transparent 55%),
    var(--paper);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: var(--lh);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img{
  max-width:100%;
  height:auto;
  display:block;
}

svg{ display:block; width:100%; height:auto; }

a{ color:inherit; }

.wrap{
  width: min(var(--wrap), calc(100% - (var(--gutter) * 2)));
  margin-inline: auto;
}

.skip-link{
  position:absolute;
  left:-9999px;
  top:auto;
  width:1px;
  height:1px;
  overflow:hidden;
}
.skip-link:focus{
  left: var(--gutter);
  top: var(--gutter);
  width:auto;
  height:auto;
  padding: 10px 12px;
  background:#ffffff;
  border:2px solid var(--ink);
  border-radius: 999px;
  box-shadow: var(--shadow);
  z-index: 9999;
}

/* Typography */
h1, h2, h3{
  line-height: 1.18;
  margin:0 0 var(--space-2);
  letter-spacing: -0.015em;
}

h1{
  font-size: clamp(1.9rem, 3.4vw, var(--fz-5));
}

h2{
  font-size: clamp(1.35rem, 2.4vw, var(--fz-4));
}

h3{
  font-size: clamp(1.1rem, 1.9vw, var(--fz-3));
}

p{ margin: 0 0 var(--space-2); }
ul, ol{ margin: 0; padding-left: 1.1em; }
li{ margin: 0 0 10px; }

.kicker{
  margin: 0 0 8px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.82rem;
  color: var(--muted);
}

.subtext{
  margin-top: -6px;
  color: var(--muted);
  font-size: var(--fz-2);
}

.caption{
  color: var(--muted);
  font-size: var(--fz-1);
}

.label{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(31,41,55,.16);
  background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(247,244,239,.85));
  box-shadow: 0 1px 0 rgba(31,41,55,.06);
  font-weight: 650;
  width: fit-content;
  margin: 0 0 var(--space-3);
}
.label::before{
  content:"";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--peri);
  box-shadow: 0 0 0 4px rgba(91,121,201,.12);
}

/* Visually hidden */
.sr-only{
  position:absolute !important;
  width:1px !important;
  height:1px !important;
  padding:0 !important;
  margin:-1px !important;
  overflow:hidden !important;
  clip: rect(0,0,0,0) !important;
  white-space: nowrap !important;
  border:0 !important;
}

/* Masthead */
.masthead{
  padding: calc(var(--space-6) + 8px) 0 var(--space-6);
  border-bottom: 1px solid rgba(214,210,203,.7);
  background:
    linear-gradient(180deg, rgba(255,255,255,.62), rgba(255,255,255,0)),
    radial-gradient(900px 600px at 20% 0%, rgba(202,162,74,.12), transparent 60%),
    radial-gradient(900px 600px at 90% 10%, rgba(91,121,201,.10), transparent 60%),
    transparent;
}

.hook{
  margin-top: var(--space-4);
  padding: var(--space-3);
  border: 1px solid rgba(214,210,203,.85);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.82), rgba(247,244,239,.82));
  box-shadow: var(--shadow);
}

.quote-line{
  margin: 0 0 8px;
  font-size: var(--fz-2);
}
.quote-line strong{
  font-weight: 750;
}

.hook-note{
  margin: 10px 0 0;
  font-size: var(--fz-2);
  font-weight: 650;
  color: var(--ink);
}
.hook-note::before{
  content:"";
  display:inline-block;
  width: 18px;
  height: 10px;
  margin-right: 10px;
  border-radius: 999px;
  background: rgba(59,143,131,.18);
  box-shadow: inset 0 0 0 2px rgba(59,143,131,.18);
  transform: translateY(-1px);
}

.hero{
  margin: var(--space-5) 0 0;
  padding: var(--space-3);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.82), rgba(247,244,239,.82));
  border: 1px solid rgba(214,210,203,.85);
  box-shadow: var(--shadow);
}
.hero img{
  border-radius: calc(var(--radius) - 6px);
  border: 1px solid rgba(31,41,55,.10);
  background: #ffffff;
}
.hero figcaption{
  margin-top: var(--space-2);
  color: var(--muted);
  font-size: var(--fz-1);
}

.architecture{
  margin-top: var(--space-4);
  padding: var(--space-3);
  border-radius: var(--radius);
  border: 1px dashed rgba(31,41,55,.22);
  background: rgba(255,255,255,.35);
}

.architecture-list{
  display:grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-left: 1.1em;
  color: var(--ink);
  font-size: var(--fz-1);
}
.architecture-foot{
  margin: var(--space-2) 0 0;
  color: var(--muted);
  font-size: var(--fz-0);
}

/* Panels */
.content{
  padding: var(--space-6) 0 var(--space-6);
}

.panel{
  padding: var(--space-5) 0;
}

.panel + .panel{
  border-top: 1px solid rgba(214,210,203,.55);
}

.panel-grid{
  display:grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: start;
}

.panel-text{
  padding: var(--space-3);
  border-radius: var(--radius);
  border: 1px solid rgba(214,210,203,.85);
  background: linear-gradient(180deg, rgba(255,255,255,.82), rgba(247,244,239,.82));
  box-shadow: var(--shadow);
}

.panel-visual{
  margin:0;
  padding: var(--space-3);
  border-radius: var(--radius);
  border: 1px solid rgba(214,210,203,.85);
  background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(247,244,239,.85));
  box-shadow: var(--shadow);
}

.panel-visual img{
  width:100%;
  border-radius: calc(var(--radius) - 6px);
  border: 1px solid rgba(31,41,55,.10);
  background:#fff;
}

.definition{
  margin: var(--space-3) 0 var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius);
  border: 1px solid rgba(31,41,55,.14);
  background: rgba(255,255,255,.75);
}
.definition-title{
  margin: 0 0 6px;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: var(--muted);
}
.definition-body{ margin:0; font-size: var(--fz-2); }

.scale{
  margin-top: var(--space-3);
  display:grid;
  gap: 10px;
}
.scale-row{
  display:grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(31,41,55,.12);
  background: rgba(255,255,255,.70);
}
.scale-row dt{
  font-weight: 750;
}
.scale-row dd{
  margin:0;
  color: var(--muted);
  font-weight: 650;
}

/* Bullets */
.bullets{
  margin-top: 6px;
  padding-left: 1.1em;
}
.bullets li{
  margin-bottom: 10px;
}
.footnote{
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid rgba(214,210,203,.7);
  color: var(--muted);
  font-size: var(--fz-1);
}

/* Callout */
.callout{
  margin-top: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius);
  border: 1px solid rgba(59,143,131,.28);
  background: linear-gradient(180deg, rgba(215,239,232,.45), rgba(255,255,255,.65));
}
.callout p{
  margin:0;
  font-size: var(--fz-2);
}

/* Biological overlay box */
.bio-overlay{
  margin-top: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius);
  border: 1px solid rgba(208,107,90,.28);
  background: linear-gradient(180deg, rgba(247,226,216,.55), rgba(255,255,255,.75));
}
.bio-overlay h3{
  margin: 0 0 10px;
}
.bio-overlay ul{
  margin:0;
}

/* Steps */
.steps{
  margin-top: var(--space-2);
  padding-left: 1.2em;
  counter-reset: step;
}
.steps li{
  margin-bottom: 12px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(31,41,55,.12);
  background: rgba(255,255,255,.70);
}

/* Mini diagram wrapper */
.mini-diagram{
  margin: var(--space-3) 0 var(--space-3);
  padding: 0;
}

/* Ending panel emphasis */
.panel-ending .panel-text{
  background:
    radial-gradient(600px 320px at 20% 30%, rgba(91,121,201,.10), transparent 60%),
    radial-gradient(600px 320px at 85% 20%, rgba(59,143,131,.10), transparent 58%),
    linear-gradient(180deg, rgba(255,255,255,.86), rgba(247,244,239,.86));
}

/* Footer */
.footer{
  padding: var(--space-5) 0 var(--space-6);
  border-top: 1px solid rgba(214,210,203,.7);
  background: rgba(255,255,255,.35);
}
.footer-line{
  margin:0;
  color: var(--muted);
  font-size: var(--fz-0);
}

/* Responsive: keep vertical narrative, allow tasteful two-column inside panels */
@media (min-width: 900px){
  .panel-grid{
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--space-5);
  }

  .architecture-list{
    grid-template-columns: 1fr 1fr;
    column-gap: 22px;
    row-gap: 8px;
  }
}

/* Print-friendly */
@media print{
  body{
    background: #ffffff !important;
  }

  .masthead{
    background: #ffffff !important;
    border-bottom: 1px solid #ddd !important;
  }

  .panel + .panel{
    border-top: 1px solid #ddd !important;
  }

  .panel-text,
  .panel-visual,
  .hero,
  .hook{
    box-shadow: none !important;
  }

  .skip-link{ display:none !important; }

  /* Encourage clean page breaks between panels */
  .panel{
    break-inside: avoid;
    page-break-inside: avoid;
  }
}