/* The Learning Earth: site styles. Navy chrome, warm paper reading surface.
   Palette taken from the printed cover: deep teal-navy ground, warm gold accents. */

@font-face{font-family:"Fraunces";font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/fonts/fraunces-latin-wght-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Fraunces";font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/fonts/fraunces-latin-ext-wght-normal.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Fraunces";font-style:italic;font-weight:100 900;font-display:swap;src:url(/assets/fonts/fraunces-latin-wght-italic.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Fraunces";font-style:italic;font-weight:100 900;font-display:swap;src:url(/assets/fonts/fraunces-latin-ext-wght-italic.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Inter";font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/fonts/inter-latin-wght-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Inter";font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/fonts/inter-latin-ext-wght-normal.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --navy:#0F3A4C; --navy-2:#143F52; --navy-deep:#0A2A38; --navy-line:rgba(236,232,222,.14);
  --paper:#F6F2E8; --paper-2:#EDE7D8; --rule:#D9D1BF;
  --ink:#161A1F; --ink-2:#454B53;
  --on-navy:#F3EEDC; --on-navy-2:#9AAFB7;
  --gold:#D8B564; --gold-ink:#8A6A1E; --gold-bright:#F5D37A;
  --serif:"Fraunces",Georgia,"Noto Serif CJK SC","Songti SC","Source Han Serif SC",serif;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--serif);font-size:1.0625rem;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:var(--gold-ink);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--navy)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}
::selection{background:rgba(216,181,100,.38)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--gold);color:#1a1200;padding:8px 14px;border-radius:6px;font-family:var(--sans);font-weight:600;z-index:10}
.skip:focus{left:8px}

.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.wrap-narrow{max-width:700px;margin:0 auto;padding:0 24px}

/* ---------- header / footer ---------- */
.site-header{background:var(--navy);border-bottom:1px solid var(--navy-line)}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:68px;flex-wrap:wrap;padding-top:10px;padding-bottom:10px}
.brand{display:inline-flex;align-items:center;gap:11px;color:var(--on-navy);text-decoration:none;font-family:var(--serif);font-weight:500;font-size:1.15rem;letter-spacing:.01em}
.brand:hover{color:var(--gold)}
.mark{width:30px;height:30px;flex:none}
.site-header nav ul{list-style:none;margin:0;padding:0;display:flex;gap:6px 22px;flex-wrap:wrap}
.site-header nav a{font-family:var(--mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--on-navy-2);text-decoration:none;padding:6px 0;border-bottom:1px solid transparent}
.site-header nav a:hover,.site-header nav a[aria-current]{color:var(--gold);border-bottom-color:var(--gold)}

.site-footer{background:var(--navy);color:var(--on-navy-2);padding:48px 0 40px;margin-top:0;font-family:var(--sans);font-size:.9rem}
.foot-top{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;padding-bottom:22px;border-bottom:1px solid var(--navy-line)}
.site-footer nav{display:flex;gap:8px 22px;flex-wrap:wrap}
.site-footer nav a{color:var(--on-navy-2);text-decoration:none;font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase}
.site-footer nav a:hover{color:var(--gold)}
.foot-note{margin:22px 0 6px;color:var(--on-navy)}
.foot-legal{margin:0;font-size:.8rem;max-width:62ch}

/* ---------- shared bits ---------- */
.eyebrow,.kicker,.kicker-sm,.tag,.byline,.toc-title,.boundary-label{font-family:var(--mono);text-transform:uppercase;letter-spacing:.16em}
.eyebrow{font-size:.74rem;color:var(--gold);margin:0 0 18px}
.dot{margin:0 .6em;opacity:.55}
.btn{display:inline-block;background:var(--gold);color:#1a1200;font-family:var(--sans);font-weight:600;font-size:.95rem;text-decoration:none;padding:12px 20px;border-radius:8px;border:1px solid var(--gold);transition:background .15s}
.btn:hover{background:var(--gold-bright);color:#1a1200}
.btn-ghost{background:transparent;color:inherit;border-color:currentColor}
.btn-ghost:hover{background:rgba(216,181,100,.14);color:inherit}
.tag{display:inline-block;font-size:.62rem;color:var(--ink-2);border:1px solid var(--rule);border-radius:100px;padding:3px 9px;margin-left:10px;vertical-align:middle;white-space:nowrap}
.soon{color:var(--ink-2);border-bottom:1px dotted var(--ink-2);cursor:default}

/* ---------- article header ---------- */
.art-head,.page-head{background:var(--navy);color:var(--on-navy);padding:56px 0 96px}
.page-head{padding-bottom:56px}
.art-head .kicker{font-size:.72rem;color:var(--gold);margin:0 0 22px}
.art-head h1,.page-head h1{font-family:var(--serif);font-weight:500;font-size:clamp(2rem,5.4vw,3.3rem);line-height:1.08;letter-spacing:-.012em;margin:0 0 20px}
.dek{font-family:var(--serif);font-size:1.2rem;line-height:1.5;color:#D4D7CB;margin:0 0 24px;font-weight:350}
.byline{font-size:.7rem;color:var(--on-navy-2);margin:0}
figure.hero{max-width:1100px;margin:-64px auto 0;padding:0 24px;position:relative}
figure.hero img{border-radius:10px;box-shadow:0 18px 50px rgba(10,30,40,.35);width:100%;background:var(--navy)}
figure.hero figcaption{font-family:var(--sans);font-size:.82rem;color:var(--ink-2);margin:12px 4px 0}

/* ---------- prose ---------- */
.prose{padding-top:44px;padding-bottom:30px;font-size:1.2rem;line-height:1.68;font-weight:380}
.prose p,.prose ul,.prose ol{margin:0 0 1.15em}
.prose h2{font-family:var(--serif);font-weight:560;font-size:1.65rem;line-height:1.2;margin:2.1em 0 .6em;letter-spacing:-.005em}
.prose h3{font-family:var(--serif);font-weight:560;font-size:1.3rem;margin:1.8em 0 .5em}
.prose strong{font-weight:640}
.prose hr{border:0;border-top:1px solid var(--rule);margin:2.6em 0}
.prose .cta{display:flex;flex-wrap:wrap;gap:12px;margin:1.4em 0 .5em}
.prose .cta .btn{font-size:.9rem}
.prose .cta .btn-ghost{color:var(--gold-ink)}
.prose .email{font-family:var(--mono);font-size:.95em;background:var(--paper-2);padding:.08em .3em;border-radius:4px;color:var(--ink)}
.prose .email .e-at,.prose .email .e-dot{font-family:var(--mono);color:var(--ink-2)}
.prose a.email-link{font-family:var(--mono);font-size:.95em;background:var(--paper-2);padding:.08em .3em;border-radius:4px;text-decoration:none;color:var(--gold-ink)}
.prose a.email-link:hover{color:var(--navy);text-decoration:underline}

.toc{background:var(--paper-2);border:1px solid var(--rule);border-radius:8px;padding:18px 22px 8px;margin:0 0 2.2em;font-family:var(--sans);font-size:.95rem}
.toc-title{font-size:.68rem;color:var(--ink-2);margin:0 0 10px}
.toc ol{margin:0 0 12px;padding-left:1.2em}
.toc li{margin:.3em 0}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}

/* the recurring epistemic-boundary component — warm paper, gold rule */
.boundary{background:#F0E9D4;border-left:4px solid var(--gold-ink);border-radius:0 8px 8px 0;padding:22px 26px 6px;margin:2.4em 0}
.boundary-label{font-size:.66rem;color:var(--gold-ink);margin:0 0 6px}
.boundary h2{margin-top:.3em}

/* ---------- more / signup ---------- */
.more{padding-top:20px;padding-bottom:30px;font-family:var(--sans)}
.more h2{font-family:var(--serif);font-size:1.25rem;margin:1.6em 0 .6em}
.pillar-list,.plain-list{list-style:none;margin:0;padding:0}
.pillar-list li,.plain-list li{padding:10px 0;border-bottom:1px solid var(--rule)}
.back-to-pillar{font-family:var(--sans);font-size:.95rem;margin:0 0 1em}
.back-to-pillar a{color:var(--gold-ink);text-decoration:none}
.back-to-pillar a:hover{color:var(--navy);text-decoration:underline}
/* Stanzas (Neiye and other primary-source articles): slightly tighter leading */
.prose p br + em,.prose p br{line-height:1.5}
.signup-band,.home-band{background:var(--navy);color:var(--on-navy);padding:56px 0 64px;margin-top:30px;text-align:center}
.signup-band h2,.home-band h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.6rem,3.6vw,2.2rem);margin:0 0 12px}
.signup-band p,.home-band p{color:#D4D7CB;font-family:var(--sans);margin:0 auto 26px;max-width:46ch}

form.notify{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;max-width:480px;margin:0 auto}
form.notify input[type=email]{flex:1 1 250px;background:var(--navy-2);border:1px solid rgba(236,232,222,.28);border-radius:8px;padding:13px 15px;font:400 .98rem var(--sans);color:var(--on-navy)}
form.notify input[type=email]::placeholder{color:#89969C}
form.notify input[type=email]:focus{border-color:var(--gold);outline:none}
form.notify button{background:var(--gold);color:#1a1200;border:0;border-radius:8px;padding:13px 22px;font:600 .95rem var(--sans);cursor:pointer}
form.notify button:hover{background:var(--gold-bright)}
form.notify button:disabled{opacity:.6;cursor:wait}
.form-note{flex-basis:100%;margin:6px 0 0;min-height:1.2em;font:400 .85rem var(--mono);color:var(--gold-bright)}
.form-fine{flex-basis:100%;margin:0;font:400 .78rem var(--sans);color:var(--on-navy-2)}
.prose form.notify{margin:1.2em 0 2em;justify-content:flex-start}
.prose .form-note{color:var(--gold-ink)}
.prose .form-fine{color:var(--ink-2)}
.prose form.notify input[type=email]{background:#fff;color:var(--ink);border-color:var(--rule)}
.newsletter{padding:44px 24px 80px}
.newsletter form.notify{background:var(--navy);padding:28px;border-radius:10px}

/* ---------- home ---------- */
.home-hero{background:var(--navy);color:var(--on-navy);padding:64px 0 72px;position:relative;overflow:hidden}
.home-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse at 70% 50%, rgba(245,211,122,.08), transparent 55%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;position:relative}
.hero-copy h1{font-family:var(--serif);font-weight:500;font-size:clamp(2.6rem,7vw,5rem);line-height:1.02;letter-spacing:-.015em;margin:0 0 16px}
.hero-copy h1 em{color:var(--gold);font-weight:400;font-style:italic}
.hero-copy .subtitle{font-family:var(--sans);color:var(--on-navy-2);font-size:1.05rem;margin:0 0 26px;max-width:36ch}
.hero-copy .lead{font-size:1.2rem;line-height:1.55;color:#DADCCF;margin:0 0 30px;max-width:46ch;font-weight:350}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin:0}
.actions .btn-ghost{color:var(--on-navy)}
.hero-fig{margin:0;perspective:1200px}
.hero-fig img{border-radius:4px;box-shadow:0 30px 60px rgba(0,0,0,.5), 0 10px 20px rgba(0,0,0,.3);max-height:580px;width:auto;margin:0 auto;object-fit:contain;transform:rotateY(-4deg) rotateX(1deg)}
.home-section{padding:72px 0 56px}
.kicker-sm{font-size:.7rem;color:var(--gold-ink);margin:0 0 10px}
.home-section h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.7rem,3.6vw,2.4rem);margin:0 0 34px;letter-spacing:-.01em}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.card{background:#fff;border:1px solid var(--rule);border-radius:12px;overflow:hidden;display:flex;flex-direction:column}
.card-img{aspect-ratio:16/8.8;overflow:hidden;background:var(--navy)}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-body{padding:20px 22px 24px;font-family:var(--sans);display:flex;flex-direction:column;gap:6px;flex:1}
.card h3{font-family:var(--serif);font-weight:560;font-size:1.28rem;line-height:1.2;margin:0}
.card p{margin:0;color:var(--ink-2);font-size:.95rem;line-height:1.55}
.card .kicker-sm{margin:0 0 4px}
.card-link{margin-top:auto;padding-top:12px;font-weight:600;text-decoration:none;color:var(--gold-ink)}
.card-link:hover{color:var(--navy)}
.card .tag{margin:12px 0 0;align-self:flex-start}

/* ---------- inner pages ---------- */
.page-head .eyebrow{margin-bottom:14px}
.book-toc{list-style:none;padding:0;margin:0;font-family:var(--sans);font-size:1rem}
.book-toc li{display:grid;grid-template-columns:110px 1fr;gap:14px;padding:11px 0;border-bottom:1px solid var(--rule)}
.toc-l{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-2);padding-top:.25em}
.pillars{padding-top:40px;padding-bottom:70px}
.pillar-block{padding:26px 0 8px;border-bottom:1px solid var(--rule);font-family:var(--sans)}
.pillar-block h2{font-family:var(--serif);font-weight:560;font-size:1.5rem;margin:0 0 8px;line-height:1.2}
.pillar-block>p{color:var(--ink-2);margin:0 0 14px}
.pillar-block .pillar-list li{font-size:.98rem}

@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-fig img{margin:0 auto;max-height:460px;transform:none}
  .cards{grid-template-columns:1fr}
}
@media (max-width:560px){
  body{font-size:1rem}
  .prose{font-size:1.1rem}
  .art-head{padding:40px 0 84px}
  figure.hero{margin-top:-52px;padding:0 14px}
  .boundary{padding:18px 18px 4px;margin-left:-8px;margin-right:-8px}
  .book-toc li{grid-template-columns:84px 1fr}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.site-header,.site-footer,.signup-band,.toc,.cta{display:none}body{background:#fff}}