/* ==========================================================================
   Off Grid Living Shop — design tokens
   Direction: battery monitor at dusk. Slate instrument housings, amber
   readouts, copper wiring. Paper only where long-form reading happens.
   ========================================================================== */

:root {
  --night:   #16202b;
  --panel:   #1e2b38;
  --panel-2: #26374a;
  --amber:   #f2a93b;
  --amber-d: #b9781f;
  --copper:  #c1663f;
  --paper:   #e9ebea;
  --paper-2: #f4f5f4;
  --ink:     #16202b;
  --muted:   #6b7a88;
  --line:    #cbd2d3;
  --good:    #5fa87a;
  --warn:    #d4732f;

  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body:    "Literata", Georgia, serif;
  --data:    "IBM Plex Mono", "SF Mono", Menlo, monospace;

  --step--1: clamp(.78rem, .76rem + .1vw, .84rem);
  --step-0:  clamp(1rem, .96rem + .2vw, 1.1rem);
  --step-1:  clamp(1.25rem, 1.15rem + .5vw, 1.5rem);
  --step-2:  clamp(1.6rem, 1.4rem + 1vw, 2.1rem);
  --step-3:  clamp(2.1rem, 1.7rem + 2vw, 3.2rem);
  --step-4:  clamp(2.6rem, 1.9rem + 3.4vw, 4.6rem);

  --wrap: 1180px;
  --gut: clamp(1.15rem, 4vw, 2.75rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: var(--step-0);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: min(100% - (var(--gut) * 2), var(--wrap)); margin-inline: auto; }
.wrap-narrow { width: min(100% - (var(--gut) * 2), 720px); margin-inline: auto; }

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: 0 0 .5em;
}
h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); }

p { margin: 0 0 1.1em; }
a { color: var(--copper); text-decoration-thickness: 1px; text-underline-offset: 3px; }

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Eyebrow — encodes the section's role, set in the utility face */
.eyebrow {
  font-family: var(--data);
  font-size: var(--step--1);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: 0 0 1.1rem;
}
.eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}
.on-dark .eyebrow { color: var(--amber); }
.on-dark .eyebrow::after { background: #33465a; }

/* ============================ masthead ================================== */

.masthead {
  background: var(--night);
  color: var(--paper);
  border-bottom: 1px solid #2b3d4f;
}
.masthead-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: .9rem 0;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: -.01em;
  color: var(--paper);
  text-decoration: none;
  text-transform: uppercase;
}
.brand .led {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 9px rgba(242,169,59,.85);
  flex: none;
  animation: pulse 3.4s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .45 } }

.nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.nav a {
  font-family: var(--data);
  font-size: var(--step--1);
  letter-spacing: .06em;
  text-transform: uppercase;
  color: #a9bccb;
  text-decoration: none;
  padding: .3rem 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--amber); border-bottom-color: var(--amber); }

/* ============================== hero ==================================== */

.hero {
  background: var(--night);
  color: var(--paper);
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(3.5rem, 9vw, 6.5rem);
  position: relative;
  overflow: hidden;
}
/* faint bus-bar rules, like a wiring schematic behind the panel */
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(90deg, transparent 0 78px, rgba(255,255,255,.028) 78px 79px);
  pointer-events: none;
}
.hero > * { position: relative; }
.hero h1 { max-width: 15ch; }
.hero h1 em {
  font-style: normal;
  color: var(--amber);
  display: block;
}
.hero-lede {
  max-width: 46ch;
  color: #b7c7d4;
  font-size: var(--step-1);
  line-height: 1.5;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
@media (max-width: 880px) { .hero-grid { grid-template-columns: 1fr; } }

/* ====================== THE SIGNATURE: readout ========================== */

.readout {
  background: linear-gradient(#101922, #182430);
  border: 1px solid #2f4356;
  border-radius: 4px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 18px 40px rgba(0,0,0,.35);
  padding: 0;
  overflow: hidden;
}
.readout-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .6rem .95rem;
  border-bottom: 1px solid #2f4356;
  background: rgba(255,255,255,.022);
}
.readout-head span {
  font-family: var(--data);
  font-size: .68rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: #7d94a8;
}
.readout-head .live { display: flex; align-items: center; gap: .45rem; color: var(--good); }
.readout-head .live::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--good); box-shadow: 0 0 7px var(--good);
  animation: pulse 2s ease-in-out infinite;
}
.readout-rows { display: grid; }
.rrow {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 1rem;
  padding: .85rem .95rem;
  border-bottom: 1px solid rgba(255,255,255,.055);
}
.rrow:last-child { border-bottom: 0; }
.rrow-label {
  font-family: var(--data);
  font-size: .72rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: #8aa1b4;
}
.rrow-label small { display: block; letter-spacing: .02em; text-transform: none; color: #5f7488; font-size: .7rem; }
.rrow-val {
  font-family: var(--data);
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  font-weight: 600;
  color: var(--amber);
  text-shadow: 0 0 18px rgba(242,169,59,.4);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.rrow-val u { text-decoration: none; font-size: .52em; color: var(--amber-d); margin-left: .22em; }
.rrow.is-primary { background: rgba(242,169,59,.055); }
.rrow.is-primary .rrow-val { font-size: clamp(1.9rem, 4.6vw, 2.9rem); }

/* ============================ sections ================================== */

.section { padding: clamp(3.2rem, 8vw, 5.75rem) 0; }
.section-alt { background: var(--paper-2); }
.section-dark { background: var(--night); color: var(--paper); }
.section-dark h2 { color: var(--paper); }
.section-dark p { color: #b7c7d4; }

.lede { font-size: var(--step-1); line-height: 1.5; max-width: 58ch; color: #3c4c5a; }
.section-dark .lede { color: #b7c7d4; }

/* tool cards */
.tools { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 1.1rem; margin-top: 2.4rem; }
.tool {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--copper);
  padding: 1.6rem 1.5rem 1.5rem;
  text-decoration: none;
  color: var(--ink);
  transition: transform .18s ease, box-shadow .18s ease, border-top-color .18s ease;
}
.tool:hover { transform: translateY(-3px); box-shadow: 0 14px 30px rgba(22,32,43,.11); border-top-color: var(--amber); }
.tool-unit {
  font-family: var(--data);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: .9rem;
}
.tool h3 { margin-bottom: .45rem; }
.tool p { font-size: .95rem; color: #4a5a68; margin-bottom: 1.2rem; }
.tool-go { margin-top: auto; font-family: var(--data); font-size: .8rem; letter-spacing: .06em; color: var(--copper); text-transform: uppercase; }
.tool-go::after { content: " →"; }

/* ============================ calculator ================================ */

.calc-shell {
  display: grid;
  grid-template-columns: 1.25fr .85fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
  padding: clamp(2.2rem, 6vw, 3.5rem) 0 clamp(3rem, 7vw, 4.5rem);
}
@media (max-width: 940px) { .calc-shell { grid-template-columns: 1fr; } }

.calc-panel { position: sticky; top: 1.2rem; }
@media (max-width: 940px) { .calc-panel { position: static; } }

fieldset { border: 0; padding: 0; margin: 0 0 2.1rem; }
legend {
  font-family: var(--display);
  font-weight: 700;
  font-size: var(--step-1);
  padding: 0;
  margin-bottom: .35rem;
}
.field-note { font-size: .88rem; color: var(--muted); margin: 0 0 1.1rem; }

label { display: block; font-family: var(--data); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: .4rem; }

input[type="number"], input[type="text"], select {
  width: 100%;
  font-family: var(--data);
  font-size: 1rem;
  padding: .68rem .75rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--ink);
}
input[type="number"]:focus, select:focus { border-color: var(--copper); }

.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.row-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 560px) { .row-3 { grid-template-columns: 1fr; } }

/* segmented control — reads like a rotary selector on a charge controller */
.seg { position: relative; display: flex; flex-wrap: wrap; gap: 0; border: 1px solid var(--line); border-radius: 2px; overflow: hidden; background: #fff; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label {
  flex: 1 1 auto;
  margin: 0;
  text-align: center;
  padding: .7rem .5rem;
  cursor: pointer;
  border-right: 1px solid var(--line);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--muted);
  background: #fff;
  transition: background .15s ease, color .15s ease;
  white-space: nowrap;
}
.seg label:last-of-type { border-right: 0; }
.seg input:checked + label { background: var(--night); color: var(--amber); }
.seg input:focus-visible + label { outline: 3px solid var(--amber); outline-offset: -3px; }

/* segmented control, inside a dark readout housing */
.readout .seg { border-color: #33465a; background: transparent; }
.readout .seg label { background: transparent; color: #8aa1b4; border-right-color: #33465a; }
.readout .seg label:hover { color: var(--paper); }
.readout .seg input:checked + label { background: var(--amber); color: var(--night); font-weight: 600; }

/* load table */
.loads { width: 100%; border-collapse: collapse; margin-bottom: .9rem; }
.loads th {
  font-family: var(--data);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: left;
  font-weight: 400;
  padding: 0 .5rem .5rem 0;
  border-bottom: 1px solid var(--line);
}
.loads th.num, .loads td.num { text-align: right; }
.loads td { padding: .45rem .5rem .45rem 0; border-bottom: 1px solid #dfe4e4; vertical-align: middle; }
.loads td:last-child, .loads th:last-child { padding-right: 0; }
.loads input[type="number"], .loads input[type="text"] { padding: .45rem .5rem; font-size: .9rem; }
.loads .wh { font-family: var(--data); font-size: .92rem; color: var(--ink); font-variant-numeric: tabular-nums; }
.col-name { width: 40%; }
.col-w, .col-h { width: 20%; }
.col-wh { width: 16%; }
.col-x { width: 4%; }

.iconbtn {
  background: none; border: 0; cursor: pointer;
  color: var(--muted); font-size: 1.15rem; line-height: 1;
  padding: .25rem .35rem; border-radius: 2px;
}
.iconbtn:hover { color: var(--warn); }

.btn {
  display: inline-block;
  font-family: var(--data);
  font-size: .8rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .75rem 1.35rem;
  border: 1px solid var(--night);
  background: var(--night);
  color: var(--amber);
  cursor: pointer;
  text-decoration: none;
  border-radius: 2px;
  transition: background .15s ease, color .15s ease;
}
.btn:hover { background: var(--panel-2); }
.btn-ghost { background: transparent; color: var(--night); }
.btn-ghost:hover { background: var(--night); color: var(--amber); }
.btn-amber { background: var(--amber); border-color: var(--amber); color: var(--night); font-weight: 600; }
.btn-amber:hover { background: #ffc061; border-color: #ffc061; color: var(--night); }

.preset-add { display: flex; gap: .6rem; align-items: flex-end; flex-wrap: wrap; margin-top: 1rem; }
.preset-add > div { flex: 1 1 220px; }

/* recommendation block — where the money is made */
.rec {
  margin-top: 1.1rem;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  padding: 1.35rem 1.4rem;
}
.rec h3, .rec .rec-h { font-size: 1.05rem; margin-bottom: .3rem; font-family: var(--display); font-weight: 700; line-height: 1.2; margin-top: 0; }
.rec .rec-why { font-size: .9rem; color: var(--muted); margin-bottom: 1rem; }
.rec-item {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: .8rem 0; border-top: 1px solid #e4e8e8; flex-wrap: wrap;
}
.rec-item-name { font-family: var(--display); font-weight: 600; font-size: .98rem; }
.rec-item-spec { font-family: var(--data); font-size: .76rem; color: var(--muted); display: block; margin-top: .15rem; }
.rec-item a { font-family: var(--data); font-size: .74rem; letter-spacing: .08em; text-transform: uppercase; white-space: nowrap; }

.flag {
  display: flex; gap: .7rem; align-items: flex-start;
  background: rgba(212,115,47,.09);
  border-left: 3px solid var(--warn);
  padding: .9rem 1.1rem;
  font-size: .92rem;
  margin-top: 1.1rem;
}
.flag strong { font-family: var(--display); }

/* ============================ articles ================================== */

.article { padding: clamp(2.5rem, 6vw, 4rem) 0 clamp(3rem, 7vw, 5rem); }
.article h2 { font-size: var(--step-2); margin-top: 2.4rem; }
.article h3 { margin-top: 1.8rem; }
.article ul, .article ol { padding-left: 1.15rem; margin-bottom: 1.2rem; }
.article li { margin-bottom: .45rem; }
.article table { width: 100%; border-collapse: collapse; margin: 1.4rem 0; font-size: .93rem; }
.article th { text-align: left; font-family: var(--data); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 400; border-bottom: 1px solid var(--line); padding: .5rem .6rem .5rem 0; }
.article td { padding: .55rem .6rem .55rem 0; border-bottom: 1px solid #dfe4e4; }
.meta { font-family: var(--data); font-size: .76rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 1.6rem; }

.pullbox {
  background: var(--night); color: var(--paper);
  padding: 1.5rem 1.6rem; margin: 2rem 0;
  border-left: 3px solid var(--amber);
}
.pullbox p:last-child { margin-bottom: 0; }
.pullbox p { color: #b7c7d4; }
.pullbox strong { color: var(--amber); font-family: var(--display); }

.guides { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.1rem; margin-top: 2.2rem; }
.guide {
  display: block; padding: 1.4rem 1.4rem 1.5rem;
  background: #fff; border: 1px solid var(--line);
  text-decoration: none; color: var(--ink);
  transition: border-color .18s ease;
}
.guide:hover { border-color: var(--copper); }
.guide .meta { margin-bottom: .6rem; }
.guide h3, .guide h2 { font-size: 1.08rem; margin-bottom: .35rem; font-family: var(--display); font-weight: 700; line-height: 1.15; margin-top: 0; }
.guide p { font-size: .9rem; color: #4a5a68; margin: 0; }

/* ============================= footer =================================== */

.footer { background: var(--night); color: #9db0c0; padding: 3.2rem 0 2.2rem; font-size: .9rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; margin-bottom: 2.4rem; }
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr; } }
.footer h4 { font-family: var(--data); font-size: .7rem; letter-spacing: .18em; text-transform: uppercase; color: var(--amber); margin-bottom: .9rem; }
.footer a { color: #9db0c0; text-decoration: none; display: block; padding: .22rem 0; }
.footer a:hover { color: var(--amber); }
.footer-legal { border-top: 1px solid #2b3d4f; padding-top: 1.5rem; font-size: .82rem; color: #6f8496; }
.footer-legal p { margin-bottom: .6rem; }

.disclosure-inline {
  font-size: .82rem; color: var(--muted);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: .8rem 0; margin: 1.6rem 0;
}

.skip {
  position: absolute; left: -9999px;
  background: var(--amber); color: var(--night);
  padding: .7rem 1.1rem; font-family: var(--data); font-size: .8rem; z-index: 99;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ============================ seo additions ============================= */

.crumbs {
  font-family: var(--data);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.4rem;
  padding-top: 1.4rem;
}
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--copper); }
.crumbs span[aria-hidden] { margin: 0 .45rem; color: var(--line); }
.on-dark .crumbs, .hero .crumbs { color: #7d94a8; }
.on-dark .crumbs a, .hero .crumbs a { color: #7d94a8; }

.faq {
  border-bottom: 1px solid var(--line);
  padding: .2rem 0;
}
.faq summary {
  cursor: pointer;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.02rem;
  padding: 1rem 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--data);
  color: var(--copper);
  font-size: 1.2rem;
  flex: none;
}
.faq[open] summary::after { content: "\2013"; }
.faq[open] summary { color: var(--copper); }
.faq > div { padding: 0 0 1.1rem; }
.faq > div p { margin: 0; color: #3c4c5a; }


/* ============================ phase 0 additions ========================= */

.formula {
  font-family: var(--data);
  font-size: .9rem;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  padding: .85rem 1rem;
  margin: 1.2rem 0 1.4rem;
  overflow-x: auto;
}
.article code {
  font-family: var(--data);
  font-size: .86em;
  background: #fff;
  border: 1px solid var(--line);
  padding: .05em .35em;
  border-radius: 2px;
}
.page-note {
  color: var(--muted);
  font-size: .9rem;
  border-top: 1px solid var(--line);
  padding-top: 1.2rem;
  margin-top: 2rem;
}
/* Placeholder the owner must fill in before publishing. Deliberately loud. */
.todo {
  background: #fff3cd;
  color: #7a4b00;
  border: 1px dashed var(--warn);
  padding: 0 .3em;
  font-family: var(--data);
  font-size: .88em;
}
@media (max-width: 560px) {
  .article table { font-size: .84rem; }
}