/* styles.css */

:root{
  --bg: #fbfaf7;
  --paper: #ffffff;
  --ink: #1f2937;
  --muted: #5b6472;
  --soft: #7a8496;

  --line: rgba(31,41,55,0.14);
  --line2: rgba(31,41,55,0.10);

  --accent: #2f6f7a;   /* calm teal */
  --accent2:#b85a3c;   /* warm clay */
  --accent3:#6b5aa6;   /* soft violet */

  --wash1: rgba(47,111,122,0.12);
  --wash2: rgba(184,90,60,0.10);
  --wash3: rgba(107,90,166,0.10);

  --shadow: 0 14px 40px rgba(31,41,55,0.08);
  --shadow2: 0 8px 22px rgba(31,41,55,0.08);

  --r12: 12px;
  --r16: 16px;
  --r20: 20px;
  --r26: 26px;

  --max: 1020px;

  --step--1: clamp(0.92rem, 0.88rem + 0.2vw, 1.02rem);
  --step-0: clamp(1.00rem, 0.96rem + 0.35vw, 1.12rem);
  --step-1: clamp(1.18rem, 1.06rem + 0.8vw, 1.52rem);
  --step-2: clamp(1.52rem, 1.24rem + 1.3vw, 2.05rem);
  --step-3: clamp(2.05rem, 1.64rem + 2.2vw, 2.9rem);

  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.25rem;
  --space-5: 1.6rem;
  --space-6: 2rem;
  --space-7: 2.6rem;
  --space-8: 3.2rem;
  --space-9: 4rem;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background: radial-gradient(1200px 480px at 50% 0%, rgba(47,111,122,0.14), transparent 60%),
              radial-gradient(900px 420px at 15% 15%, rgba(184,90,60,0.10), transparent 65%),
              radial-gradient(900px 520px at 85% 20%, rgba(107,90,166,0.10), transparent 70%),
              var(--bg);
  color: var(--ink);
  line-height: 1.45;
}

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

a{ color: inherit; text-decoration-thickness: 0.08em; text-underline-offset: 0.16em; }
a:hover{ text-decoration-thickness: 0.14em; }

.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.svg-sprite{
  position:absolute;
  width:0;
  height:0;
  overflow:hidden;
}

.skip-link{
  position:absolute;
  left:-9999px;
  top:auto;
  width:1px;
  height:1px;
  overflow:hidden;
}
.skip-link:focus{
  left: var(--space-4);
  top: var(--space-4);
  width:auto;
  height:auto;
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  background: var(--paper);
  box-shadow: var(--shadow2);
  border: 1px solid var(--line);
  z-index: 50;
}

/* Header */
.page-header{
  padding: var(--space-8) 0 var(--space-7);
}

.eyebrow{ margin:0 0 var(--space-3); }
.badge{
  display:inline-flex;
  gap: 0.55rem;
  align-items:center;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 8px 18px rgba(31,41,55,0.06);
  font-size: var(--step--1);
  color: var(--muted);
}

.badge.small{
  padding: 0.35rem 0.65rem;
  font-size: 0.92rem;
}

.icon{
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.title{
  margin: 0;
  font-size: var(--step-3);
  letter-spacing: -0.02em;
}
.subtitle{
  margin: var(--space-2) 0 0;
  font-size: var(--step-1);
  color: var(--muted);
  max-width: 48ch;
}

.hook{
  margin-top: var(--space-6);
  padding: var(--space-5);
  border-radius: var(--r20);
  background: linear-gradient(135deg, rgba(47,111,122,0.14), rgba(184,90,60,0.10));
  border: 1px solid var(--line);
  box-shadow: var(--shadow2);
}
.hook p{
  margin:0;
  font-size: var(--step-0);
}
.hook p + p{ margin-top: var(--space-2); }
.hook-small{
  color: var(--muted);
}

.hero-figure{
  margin: var(--space-7) 0 var(--space-5);
  background: var(--paper);
  border-radius: var(--r26);
  border: 1px solid var(--line);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.hero-figure img{
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}
.hero-figure figcaption{
  padding: var(--space-4) var(--space-5);
  color: var(--muted);
  font-size: var(--step--1);
  border-top: 1px solid var(--line2);
}

.scan-row{
  margin-top: var(--space-5);
}

.stage-chips{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.stage-chips a{
  display:inline-flex;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.70);
  font-size: var(--step--1);
  color: var(--muted);
}
.stage-chips a:hover{
  background: rgba(255,255,255,0.92);
}

/* Main */
.page{
  padding: 0 0 var(--space-9);
}

.module{
  margin: 0 0 var(--space-8);
}

.intro{
  margin-top: var(--space-2);
}

.intro-grid{
  display:grid;
  gap: var(--space-6);
  align-items: start;
  grid-template-columns: 1.1fr 0.9fr;
}

.intro h2{
  margin:0 0 var(--space-3);
  font-size: var(--step-2);
  letter-spacing: -0.01em;
}
.lede{
  margin: 0 0 var(--space-4);
  color: var(--muted);
  font-size: var(--step-0);
  max-width: 62ch;
}
.bullets{
  margin:0;
  padding-left: 1.1rem;
  color: var(--ink);
}
.bullets li{
  margin: 0.35rem 0;
}
.bullets strong{
  color: var(--accent);
}

.mini-figure{
  margin:0;
  background: rgba(255,255,255,0.70);
  border: 1px solid var(--line);
  border-radius: var(--r20);
  padding: var(--space-4);
  box-shadow: 0 10px 22px rgba(31,41,55,0.06);
}
.mini-figure figcaption{
  margin-top: var(--space-3);
  color: var(--muted);
  font-size: var(--step--1);
}
.loop-mark{
  width: 100%;
  height: auto;
}
.loop-path{
  fill:none;
  stroke: rgba(47,111,122,0.45);
  stroke-width: 4;
  stroke-linecap: round;
}
.loop-dots circle{
  fill: rgba(184,90,60,0.55);
}

/* Spine (gentle center line) */
.spine{
  position: relative;
  height: 40px;
  margin: var(--space-7) 0 var(--space-7);
}
.spine-line{
  position:absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, rgba(47,111,122,0), rgba(47,111,122,0.25), rgba(47,111,122,0));
  border-radius: 999px;
}

/* Stage Modules */
.stage-card{
  background: rgba(255,255,255,0.78);
  border: 1px solid var(--line);
  border-radius: var(--r26);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.stage-head{
  padding: var(--space-6) var(--space-6) var(--space-5);
  background:
    radial-gradient(900px 260px at 12% 0%, var(--wash1), transparent 60%),
    radial-gradient(900px 260px at 88% 0%, var(--wash2), transparent 60%),
    rgba(255,255,255,0.60);
  border-bottom: 1px solid var(--line2);
}
.stage-kicker{
  margin:0 0 var(--space-2);
  display:flex;
  align-items:center;
  gap: var(--space-2);
  color: var(--muted);
  font-size: var(--step--1);
}
.stage-num{
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display:grid;
  place-items:center;
  background: rgba(47,111,122,0.14);
  border: 1px solid rgba(47,111,122,0.22);
  color: var(--accent);
  font-weight: 700;
}
.stage-label{
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.82rem;
}
.stage-head h2{
  margin:0;
  font-size: var(--step-2);
  letter-spacing: -0.01em;
}
.stage-sub{
  margin: var(--space-2) 0 0;
  color: var(--muted);
  font-size: var(--step-0);
  max-width: 60ch;
}

.stage-body{
  display:grid;
  gap: var(--space-6);
  grid-template-columns: 1fr 1fr;
  padding: var(--space-6);
}

.stage-copy{
  min-width: 0;
}

.micro{
  padding: var(--space-4);
  border-radius: var(--r20);
  border: 1px solid var(--line2);
  background: rgba(255,255,255,0.70);
}
.micro-title{
  margin:0 0 var(--space-2);
  font-size: var(--step-0);
}
.micro-list{
  margin:0;
  padding-left: 1.1rem;
  color: var(--muted);
}
.micro-list li{ margin: 0.35rem 0; }

.callouts{
  margin-top: var(--space-4);
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.stat{
  padding: var(--space-4);
  border-radius: var(--r20);
  border: 1px solid rgba(47,111,122,0.22);
  background: linear-gradient(180deg, rgba(47,111,122,0.10), rgba(255,255,255,0.70));
}
.stat-top{ margin:0; }
.stat-num{
  display:inline-block;
  font-size: 1.7rem;
  font-weight: 780;
  letter-spacing: -0.01em;
  color: var(--accent);
}
.stat-text{
  margin: var(--space-2) 0 0;
  color: var(--ink);
}
.stat-src{
  margin: var(--space-2) 0 0;
  color: var(--soft);
  font-size: 0.92rem;
}

.note{
  padding: var(--space-4);
  border-radius: var(--r20);
  border: 1px solid rgba(184,90,60,0.22);
  background: linear-gradient(180deg, rgba(184,90,60,0.10), rgba(255,255,255,0.70));
}
.note.big{
  border-color: rgba(107,90,166,0.22);
  background: linear-gradient(180deg, rgba(107,90,166,0.10), rgba(255,255,255,0.75));
}
.note-title{
  margin:0 0 var(--space-2);
  font-weight: 740;
  color: var(--accent2);
}
.note.big .note-title{ color: var(--accent3); }
.note-text{ margin:0; color: var(--ink); }
.note-src{
  margin: var(--space-2) 0 0;
  color: var(--soft);
  font-size: 0.92rem;
}

.psy{
  margin-top: var(--space-4);
}
.chip-title{
  margin:0 0 var(--space-2);
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--soft);
}
.chips{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-wrap:wrap;
  gap: 0.55rem;
}
.chip{
  display:inline-flex;
  padding: 0.42rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.74);
  color: var(--muted);
  font-size: var(--step--1);
}

.stage-visuals{
  min-width: 0;
  display:grid;
  gap: var(--space-4);
  align-content: start;
}

.icon-row{
  display:flex;
  flex-wrap:wrap;
  gap: var(--space-3);
}

.icon-card{
  margin:0;
  flex: 1 1 140px;
  min-width: 140px;
  padding: var(--space-3);
  border-radius: var(--r20);
  border: 1px solid var(--line2);
  background: rgba(255,255,255,0.70);
  display:flex;
  gap: var(--space-2);
  align-items: center;
}
.icon-card figcaption{
  margin:0;
  color: var(--muted);
  font-size: var(--step--1);
}

.stage-figure{
  margin:0;
  background: var(--paper);
  border-radius: var(--r26);
  border: 1px solid var(--line);
  overflow:hidden;
  box-shadow: 0 10px 24px rgba(31,41,55,0.06);
}
.stage-figure img{
  width:100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}
.stage-figure figcaption{
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--line2);
  color: var(--muted);
  font-size: var(--step--1);
}

.mini-chart{
  margin:0;
  background: rgba(255,255,255,0.70);
  border: 1px solid var(--line);
  border-radius: var(--r26);
  padding: var(--space-4);
}
.mini-chart figcaption{
  margin-top: var(--space-3);
  color: var(--muted);
  font-size: var(--step--1);
}
.mini-chart svg{ width:100%; height:auto; }
.axis{
  fill:none;
  stroke: rgba(31,41,55,0.18);
  stroke-width: 2;
}
.line{
  fill:none;
  stroke: rgba(184,90,60,0.75);
  stroke-width: 4;
  stroke-linecap: round;
}
.dot{ fill: rgba(184,90,60,0.75); }
.label{
  fill: rgba(31,41,55,0.70);
  font-size: 14px;
}

/* Stage 3 stability motif */
.symmetry-card{
  margin:0;
  background: rgba(255,255,255,0.70);
  border: 1px solid var(--line);
  border-radius: var(--r26);
  padding: var(--space-4);
  box-shadow: 0 10px 24px rgba(31,41,55,0.06);
}
.symmetry{ width:100%; height:auto; }
.shelf{
  fill: rgba(47,111,122,0.16);
  stroke: rgba(47,111,122,0.28);
  stroke-width: 2;
}
.soft-line{
  fill:none;
  stroke: rgba(31,41,55,0.18);
  stroke-width: 2;
  stroke-linecap: round;
}

.caption-card{
  padding: var(--space-4);
  border-radius: var(--r26);
  border: 1px solid rgba(107,90,166,0.22);
  background: linear-gradient(180deg, rgba(107,90,166,0.10), rgba(255,255,255,0.70));
}
.caption-title{
  margin:0 0 var(--space-2);
  font-weight: 760;
  color: var(--accent3);
}
.caption-text{
  margin:0;
  color: var(--ink);
}

/* Quotes */
.pull-quote{
  margin: 0 0 var(--space-4);
  padding: var(--space-4);
  border-radius: var(--r26);
  border: 1px dashed rgba(31,41,55,0.22);
  background: rgba(255,255,255,0.70);
  display:flex;
  gap: var(--space-2);
  align-items: flex-start;
  color: var(--ink);
}
.pull-quote span{
  font-size: var(--step-0);
}

/* Stage 5 concept graphic */
.concept-figure{
  margin:0;
  background: rgba(255,255,255,0.70);
  border: 1px solid var(--line);
  border-radius: var(--r26);
  padding: var(--space-4);
}
.concept-figure svg{ width:100%; height:auto; }
.bin{
  fill: rgba(47,111,122,0.12);
  stroke: rgba(47,111,122,0.30);
  stroke-width: 2;
}
.fill{
  fill: rgba(184,90,60,0.22);
  stroke: rgba(184,90,60,0.35);
  stroke-width: 2;
}
.concept-figure figcaption{
  margin-top: var(--space-3);
  color: var(--muted);
  font-size: var(--step--1);
}

/* Stage 6 drift graphic */
.drift-figure{
  margin:0;
  background: rgba(255,255,255,0.70);
  border: 1px solid var(--line);
  border-radius: var(--r26);
  padding: var(--space-4);
}
.drift-figure svg{ width:100%; height:auto; }
.counter{
  fill: rgba(47,111,122,0.10);
  stroke: rgba(47,111,122,0.26);
  stroke-width: 2;
}
.tile{
  fill: rgba(255,255,255,0.85);
  stroke: rgba(31,41,55,0.12);
  stroke-width: 2;
}
.pile rect{
  fill: rgba(107,90,166,0.16);
  stroke: rgba(107,90,166,0.30);
  stroke-width: 2;
}
.drift-figure figcaption{
  margin-top: var(--space-3);
  color: var(--muted);
  font-size: var(--step--1);
}

.reframe{
  padding: var(--space-4);
  border-radius: var(--r26);
  border: 1px solid rgba(47,111,122,0.22);
  background: linear-gradient(180deg, rgba(47,111,122,0.10), rgba(255,255,255,0.75));
  display:flex;
  gap: var(--space-2);
  align-items: flex-start;
}
.reframe p{
  margin:0;
  color: var(--ink);
}

/* Cycle section */
.cycle{
  background: rgba(255,255,255,0.78);
  border: 1px solid var(--line);
  border-radius: var(--r26);
  box-shadow: var(--shadow);
  padding: var(--space-6);
}
.cycle-head h2{
  margin:0;
  font-size: var(--step-2);
}
.cycle-sub{
  margin: var(--space-2) 0 0;
  color: var(--muted);
  font-size: var(--step-0);
}
.cycle-figure{
  margin: var(--space-6) 0 0;
}
.cycle-figure svg{
  width:100%;
  height:auto;
  display:block;
}
.cycle-figure figcaption{
  margin-top: var(--space-3);
  color: var(--muted);
  font-size: var(--step--1);
}
.cycle-ring{
  fill:none;
  stroke: rgba(31,41,55,0.14);
  stroke-width: 10;
}
.cycle-arrow{
  fill:none;
  stroke: rgba(47,111,122,0.55);
  stroke-width: 6;
  stroke-linecap: round;
}
.arrowhead{
  fill: rgba(47,111,122,0.55);
  stroke: none;
  opacity: 0.9;
}
.node circle{
  fill: rgba(255,255,255,0.92);
  stroke: rgba(31,41,55,0.22);
  stroke-width: 2.4;
}
.node text{
  fill: rgba(31,41,55,0.85);
  font-weight: 760;
  font-size: 18px;
}
.node-label{
  fill: rgba(91,100,114,0.95);
  font-weight: 620;
  font-size: 16px;
}
.center-disc{
  fill: rgba(184,90,60,0.10);
  stroke: rgba(184,90,60,0.22);
  stroke-width: 2;
}
.center-title{
  fill: rgba(31,41,55,0.90);
  font-weight: 820;
  font-size: 28px;
  letter-spacing: -0.01em;
}
.center-sub{
  fill: rgba(91,100,114,0.95);
  font-size: 14px;
}

.cycle-alt{
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line2);
}
.cycle-alt h3{
  margin:0 0 var(--space-3);
  font-size: var(--step-1);
}
.recap{
  margin:0;
  padding-left: 1.1rem;
  color: var(--muted);
}
.recap li{
  margin: 0.45rem 0;
}
.recap strong{
  color: var(--ink);
}

/* Sources */
.sources{
  background: rgba(255,255,255,0.72);
  border: 1px solid var(--line);
  border-radius: var(--r26);
  box-shadow: 0 10px 26px rgba(31,41,55,0.06);
  padding: var(--space-6);
}
.sources h2{
  margin:0 0 var(--space-3);
  font-size: var(--step-1);
}
.source-list{
  margin:0;
  padding-left: 1.1rem;
  color: var(--muted);
}
.source-list li{
  margin: 0.55rem 0;
}
.footer-line{
  margin: var(--space-5) 0 0;
}

/* Responsive */
@media (max-width: 920px){
  .intro-grid{ grid-template-columns: 1fr; }
  .stage-body{ grid-template-columns: 1fr; }
  .callouts{ grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
}