/* RevGen field guide. Deep-water header band, fog-grey page, status pills that read like a regulations sign. */
:root{
  --deep:#0B2A3C;        /* header band, headings */
  --deep-2:#123B52;
  --bg:#F2F5F6;          /* page */
  --card:#FFFFFF;
  --ink:#14262F;
  --muted:#5B6E77;
  --line:#D8E1E4;
  --tide:#0F7484;        /* links, buttons */
  --tide-soft:#E1F0F2;
  --kelp:#2F7A3B;  --kelp-soft:#E4F2E5;     /* open / yes */
  --flag:#C8431B;  --flag-soft:#FCE9E2;     /* closed / no */
  --amber:#9A5B00; --amber-soft:#FFF3DC;    /* check / unverified */
  --contour:rgba(255,255,255,.06);
  --radius:14px;
  --f-head:"Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-body:"Public Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --f-mono:"IBM Plex Mono", ui-monospace, Menlo, monospace;
}
@media (prefers-color-scheme: dark){
  :root{
    --deep:#081E2B; --deep-2:#0E2C3E; --bg:#0D1A20; --card:#13242C; --ink:#E3EDF0; --muted:#97AAB2; --line:#24373F;
    --tide:#5CC3CF; --tide-soft:#16343B; --kelp:#86C98F; --kelp-soft:#173220; --flag:#F08A68; --flag-soft:#3A1F17;
    --amber:#F2B356; --amber-soft:#3A2E17; --contour:rgba(255,255,255,.05); color-scheme:dark;
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
a{color:var(--tide);text-underline-offset:3px}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--tide);outline-offset:2px;border-radius:6px}
.wrap{max-width:820px;margin:0 auto;padding-inline:16px}
.wrap.wide{max-width:1040px}

/* ---------- Header band ---------- */
.band{background:var(--deep);color:#EAF3F6;position:relative;overflow:hidden;
  background-image:repeating-radial-gradient(circle at 85% 120%, transparent 0 22px, var(--contour) 22px 23px);}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-block:14px}
.brand{font:800 20px/1 var(--f-head);letter-spacing:-.01em;color:#fff;text-decoration:none;display:flex;align-items:center;gap:8px}
.brand svg{width:22px;height:22px}
.topbar nav{display:flex;gap:16px;font-size:14px;font-weight:600}
.topbar nav a{color:#CFE3EA;text-decoration:none}
.topbar nav a:hover{color:#fff}
.topbar nav a.cta{background:#fff;color:var(--deep);padding:7px 12px;border-radius:999px}
.hero{padding-block:28px 40px}
.hero h1{font:800 clamp(32px,6.5vw,54px)/1.02 var(--f-head);letter-spacing:-.025em;margin:0 0 12px;max-width:16ch;text-wrap:balance}
.hero p{margin:0 0 20px;color:#B9D2DB;font-size:18px;max-width:52ch}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.18);padding:8px 13px;border-radius:999px;font-size:14px;font-weight:600;text-decoration:none}
.chips a:hover{background:rgba(255,255,255,.18)}
.page-head{padding-block:18px 30px}
.crumbs{font-size:13px;color:#A9C4CE;margin-bottom:10px}
.crumbs a{color:#CFE3EA}
.page-head h1{font:800 clamp(28px,5.6vw,44px)/1.06 var(--f-head);letter-spacing:-.02em;margin:0 0 8px;text-wrap:balance}
.page-head .sub{color:#B9D2DB;margin:0;font-size:17px}

/* ---------- At-a-glance strip ---------- */
.glance{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-top:-22px;position:relative}
.g{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px;box-shadow:0 6px 18px -12px rgba(11,42,60,.45)}
.g .k{font:600 11px/1 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.g .v{font:800 17px/1.25 var(--f-head);margin-top:6px}
.g.yes .v{color:var(--kelp)} .g.no .v{color:var(--flag)} .g.check .v{color:var(--amber)}
.stamp{font:500 12px/1.4 var(--f-mono);color:var(--muted);margin:14px 0 0}

/* ---------- Jump nav ---------- */
.jump{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);margin:18px -16px 0;padding:10px 16px;display:flex;gap:8px;overflow-x:auto;scrollbar-width:none}
.jump a{flex:none;font-size:13px;font-weight:700;padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--ink);text-decoration:none}
.jump a:hover{border-color:var(--tide);color:var(--tide)}

/* ---------- Sections ---------- */
main{padding-block:20px 48px}
section{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:0 0 16px;scroll-margin-top:64px}
h2{font:800 22px/1.2 var(--f-head);letter-spacing:-.01em;margin:0 0 12px}
h3{font:700 17px/1.3 var(--f-head);margin:0 0 4px}
.meta{font-size:14px;color:var(--muted)}
.lede{color:var(--muted);font-size:17px}
p{margin:0 0 12px}

/* Quick answer rows */
.qa-list{display:grid;gap:12px}
.qa{display:grid;grid-template-columns:104px 1fr;gap:12px;align-items:start}
.pill{justify-self:start;font:700 11px/1 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;padding:6px 9px;border-radius:6px;white-space:nowrap}
.pill.yes{background:var(--kelp-soft);color:var(--kelp)}
.pill.no{background:var(--flag-soft);color:var(--flag)}
.pill.need{background:var(--tide-soft);color:var(--tide)}
.pill.check{background:var(--amber-soft);color:var(--amber)}
.unverified{display:inline-block;background:var(--amber-soft);color:var(--amber);font:700 11px/1.4 var(--f-mono);padding:2px 6px;border-radius:5px;letter-spacing:.04em}
.check-note{font-size:13px;color:var(--muted);display:block;margin-top:2px}

/* Tables become stacked rows on phones */
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;padding:11px 8px;border-bottom:1px solid var(--line);vertical-align:top}
th{font:600 11px/1.3 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
td:first-child{font-weight:700}
td.src{font-size:13px;white-space:nowrap}
@media (max-width:620px){
  table.stack thead{display:none}
  table.stack tr{display:block;padding:12px 0;border-bottom:1px solid var(--line)}
  table.stack td{display:block;border:0;padding:2px 0}
  table.stack td.src{white-space:normal}
  table.stack td.src::before{content:"Source: ";color:var(--muted)}
}
ul.clean{margin:0;padding-left:20px}
ul.clean li{margin-bottom:9px}

/* Conditions tiles */
.tiles{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.tile{display:block;border:1px solid var(--line);border-radius:12px;padding:13px;text-decoration:none;color:var(--ink);background:var(--card)}
a.tile:hover{border-color:var(--tide)}
.tile strong{display:block;font-family:var(--f-head);color:var(--tide)}
.tile span{font-size:14px;color:var(--muted)}

/* FAQ */
details{border-bottom:1px solid var(--line);padding:12px 0}
details:last-child{border-bottom:0}
summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font:700 20px/1 var(--f-head);color:var(--tide)}
details[open] summary::after{content:"–"}
details p{margin:8px 0 0;color:var(--ink)}

/* Alert strip */
.alert{display:flex;gap:12px;align-items:flex-start;background:var(--flag-soft);border:1px solid color-mix(in srgb,var(--flag) 35%,transparent);border-radius:var(--radius);padding:14px 16px;margin:0 0 16px}
.alert b{color:var(--flag)}
.alert .dot{flex:none;width:10px;height:10px;border-radius:50%;background:var(--flag);margin-top:7px}

/* Cards (home + related) */
.grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-decoration:none;color:var(--ink);transition:border-color .15s, transform .15s}
.card:hover{border-color:var(--tide);transform:translateY(-2px)}
@media (prefers-reduced-motion:reduce){.card{transition:none}.card:hover{transform:none}}
.card .row{display:flex;justify-content:space-between;align-items:center;gap:8px}
.card .where{font:600 11px/1 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.card h3{font-size:19px;margin:0}
.facts{display:flex;flex-wrap:wrap;gap:6px}
.facts span{font-size:12px;font-weight:600;background:var(--bg);border:1px solid var(--line);padding:3px 8px;border-radius:999px}
.card .go{font-size:14px;font-weight:700;color:var(--tide);margin-top:auto}
.section-title{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:4px 12px;margin:28px 0 12px}
.section-title h2{margin:0}
.section-title span{font-size:14px;color:var(--muted)}
.qlist{display:grid;gap:0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.qlist a,.qlist .soon{display:flex;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink);font-weight:600}
.qlist > :last-child{border-bottom:0}
.qlist a::after{content:"→";color:var(--tide)}
.qlist a:hover{background:var(--tide-soft)}
.qlist .soon{color:var(--muted);font-weight:500;pointer-events:none}
.qlist .soon::after{content:"Soon";font:600 11px/1.6 var(--f-mono);letter-spacing:.06em;text-transform:uppercase}

/* Email signup */
.signup{background:var(--deep);color:#EAF3F6;border:0;background-image:repeating-radial-gradient(circle at 10% -20%, transparent 0 22px, var(--contour) 22px 23px)}
.signup h2{color:#fff}
.signup .meta{color:#B9D2DB}
.signup form{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.signup input[type=email]{flex:1 1 220px;min-width:0;padding:13px 14px;border:0;border-radius:10px;font:inherit;background:#fff;color:#14262F}
.signup button{padding:13px 18px;border:0;border-radius:10px;background:#F2B356;color:#1B1405;font:700 16px var(--f-body);cursor:pointer}
.signup button:hover{filter:brightness(1.05)}
.hidden{position:absolute;left:-9999px}

/* Trust row */
.trust{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));margin-top:16px}
.trust div{font-size:14px;color:var(--muted)}
.trust b{display:block;color:var(--ink);font-family:var(--f-head)}

footer.site{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-block:18px 32px}

@media (max-width:520px){.topbar nav a:not(.cta){display:none}.qa{grid-template-columns:1fr;gap:6px}}