/* ==========================================================================
   COSTELLO — SHARED SHELL + COMPONENTS (proposed). Depends on tokens.css.
   Class prefix .c- keeps it separate from legacy .pa-/.about2-/.faq2- selectors
   so it can be introduced page by page.
   ========================================================================== */
.costello-system,.costello-system *,.costello-system *::before,.costello-system *::after{box-sizing:border-box}
html.costello-document{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-h,88px) + 16px)}
@media (max-width:900px){html.costello-document{scroll-padding-top:calc(var(--header-h-sm,64px) + 16px)}}
body.costello-system{margin:0;background:var(--c-canvas);color:var(--c-ink);font:400 var(--fs-body)/var(--lh-body) var(--ff-sans);-webkit-font-smoothing:antialiased}
.costello-system img{display:block;max-width:100%}
:where(.costello-system) a{color:inherit}
.costello-system :focus-visible{outline:var(--focus-w) solid var(--c-focus);outline-offset:var(--focus-offset)}
.m-navy :focus-visible,.c-footer :focus-visible{outline-color:var(--c-signal-on-navy)}
.c-skip{position:fixed;left:16px;top:-80px;z-index:100;background:var(--c-paper);padding:12px 16px}
.c-skip:focus{top:12px}

/* ---------- Layout ---------- */
.c-wrap{width:100%;max-width:calc(var(--content-max) + 2*var(--gutter));margin-inline:auto;padding-inline:var(--gutter)}
.c-section{padding-block:var(--section-y)}
.c-section--tight{padding-block:var(--section-y-tight)}
.c-split{display:grid;grid-template-columns:7fr 5fr;gap:var(--s-6) var(--col-gap);align-items:start}
.c-split--rev{grid-template-columns:5fr 7fr}
.c-split--half{grid-template-columns:1fr 1fr}
.c-split--ref{grid-template-columns:4fr 8fr}
@media (max-width:900px){.c-split,.c-split--rev,.c-split--half,.c-split--ref{grid-template-columns:1fr}}

/* ---------- Materials (one class per section; content roles in docs) ---------- */
.m-canvas{background:var(--c-canvas)}
.m-alt{background:var(--c-canvas-alt)}
.m-navy{background:var(--c-navy);color:var(--c-on-navy)}
/* Same-material neighbours get a neutral hairline at the content edge, never orange */
.m-canvas+.m-canvas>.c-wrap,.m-alt+.m-alt>.c-wrap{border-top:1px solid var(--c-rule);padding-top:var(--section-y)}
.m-canvas+.m-canvas,.m-alt+.m-alt{padding-top:0}

/* ---------- Type roles ---------- */
.t-display,.t-title,.t-chapter,.t-section,.t-card,.t-name{font-family:var(--ff-serif);font-weight:var(--fw-serif);letter-spacing:var(--ls-display);margin:0;text-wrap:balance;font-kerning:normal}
.t-display{font-size:var(--fs-display);line-height:var(--lh-display);max-width:13ch}
.t-title{font-size:var(--fs-title);line-height:var(--lh-display);max-width:18ch}
.t-chapter{font-size:var(--fs-chapter);line-height:var(--lh-heading);max-width:20ch}
.t-section{font-size:var(--fs-section);line-height:var(--lh-heading);max-width:22ch}
.t-card{font-size:var(--fs-card);line-height:var(--lh-card)}
.t-name{font-size:var(--fs-name);line-height:var(--lh-card)}
/* Intentional line groups: each group is an inline-block that may itself wrap.
   Group layout switches by container width, never by device. */
.t-groups>span{display:inline}
@container head (min-width:16em){.t-groups>span{display:inline-block}}
.c-head{container:head/inline-size}
.t-lede{font-size:var(--fs-lede);line-height:var(--lh-lede);max-width:var(--measure-lede);margin:0;text-wrap:pretty}
.t-body.costello-system{max-width:var(--measure);margin:0 0 1em;text-wrap:pretty}
.t-muted{color:var(--c-ink-muted)}
.m-navy .t-muted{color:var(--c-on-navy-muted)}
.t-small{font-size:var(--fs-small);line-height:1.65}
.t-eyebrow{font:500 var(--fs-mono)/1.5 var(--ff-mono);letter-spacing:var(--ls-mono);text-transform:uppercase;margin:0 0 var(--stack-heading);color:var(--c-ink)}
.t-eyebrow .seq{color:var(--c-signal-text)}
.m-navy .t-eyebrow{color:var(--c-on-navy)}
.m-navy .t-eyebrow .seq{color:var(--c-signal-on-navy)}
.t-label{font:500 var(--fs-mono-sm)/1.6 var(--ff-mono);letter-spacing:.12em;text-transform:uppercase;margin:0 0 var(--s-3);color:var(--c-ink-muted)}
.m-navy .t-label{color:var(--c-on-navy-muted)}
.t-caption{font:500 var(--fs-mono-sm)/1.5 var(--ff-mono);letter-spacing:var(--ls-mono);text-transform:uppercase;color:var(--c-ink-muted)}

/* ---------- Header ---------- */
.c-header{position:sticky;top:0;z-index:50;height:var(--header-h);background:rgb(247 243 236 / 92%);backdrop-filter:blur(14px);border-bottom:1px solid var(--c-rule);transition:background-color var(--dur-tone),color var(--dur-tone)}
.c-header .c-wrap{height:100%;display:flex;align-items:center;gap:var(--s-6)}
.c-brand img{width:122px;height:auto}
.c-nav{display:flex;gap:var(--s-6);margin-left:auto;font-size:var(--fs-ui)}
.c-nav a{text-decoration:none;color:var(--c-ink-muted);padding-block:12px;border-bottom:1px solid transparent}
.c-nav a:hover{color:var(--c-ink)}
.c-nav a[aria-current=page]{color:var(--c-ink);border-bottom-color:var(--c-signal)}
.c-phone{font:500 15px/1.2 var(--ff-sans);text-decoration:none;white-space:nowrap}
.c-phone small{display:block;font:500 10px/1.6 var(--ff-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--c-ink-muted)}
.c-menu-btn{display:none}
.c-header.is-dark{background:rgb(23 40 59 / 92%);color:var(--c-on-navy);border-color:var(--c-rule-on-navy)}
.c-header.is-dark .c-nav a{color:var(--c-on-navy-muted)}
.c-header.is-dark .c-nav a[aria-current=page]{color:var(--c-on-navy);border-bottom-color:var(--c-signal-on-navy)}
.c-header.is-dark .c-brand img{filter:brightness(0) invert(1)}
.c-header.is-dark .c-btn{background:var(--c-on-navy);color:var(--c-navy);border-color:var(--c-on-navy)}
@media (max-width:1100px){.c-phone{display:none}.c-nav{gap:var(--s-5)}}
@media (max-width:900px){
  .c-header{height:var(--header-h-sm)}
  .c-brand img{width:84px}
  .c-nav,.c-header .c-btn{display:none}
  .c-call{margin-left:auto}
  .c-menu-btn{display:inline-flex}
}
.c-call,.c-menu-btn{min-width:44px;min-height:44px;align-items:center;justify-content:center;border:1px solid var(--c-rule);background:transparent;font:500 11px var(--ff-mono);letter-spacing:.12em;text-transform:uppercase;color:inherit;text-decoration:none;padding:0 12px}
.c-call{display:none}
@media (max-width:900px){.c-call{display:inline-flex}}

/* ---------- Buttons & links ---------- */
.c-btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:48px;padding:0 24px;background:var(--c-navy);color:var(--c-on-navy);border:1px solid var(--c-navy);font:500 var(--fs-ui)/1 var(--ff-sans);text-decoration:none;cursor:pointer;transition:background-color var(--dur-base)}
.c-btn:hover{background:var(--c-navy-deep)}
.c-btn[disabled],.c-btn[aria-disabled=true]{opacity:.45;cursor:not-allowed}
.c-btn .arr{color:var(--c-signal-on-navy)}
.m-navy .c-btn{background:var(--c-on-navy);color:var(--c-navy);border-color:var(--c-on-navy)}
.m-navy .c-btn .arr{color:var(--c-signal-text)}
.c-btn--ghost{background:transparent;color:var(--c-ink);border-color:var(--c-ink)}
.c-btn--ghost:hover{background:var(--c-paper)}
/* Text link: navy underline at rest; orange underline is the HOVER/active signal */
.c-link{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-size:var(--fs-small);text-decoration:underline;text-decoration-color:currentColor;text-decoration-thickness:1px;text-underline-offset:7px;transition:text-decoration-color var(--dur-fast)}
.c-link:hover{text-decoration-color:var(--c-signal)}
.m-navy .c-link:hover{text-decoration-color:var(--c-signal-on-navy)}
.c-link .arr{text-decoration:none}

/* ---------- Plates (image treatment) ---------- */
.c-plate{margin:0;background:var(--c-paper);border:1px solid var(--c-rule);padding:var(--plate-pad)}
.m-navy .c-plate{background:var(--c-navy-raised);border-color:var(--c-rule-on-navy)}
.c-plate__img{position:relative;overflow:hidden;aspect-ratio:var(--ar,4/5)}
.c-plate__img img{width:100%;height:100%;object-fit:cover;object-position:var(--fp,50% 50%);filter:saturate(.8)}
.c-plate__img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 60%,rgb(12 24 35 / 32%))}
.c-plate__tag{position:absolute;z-index:1;left:16px;bottom:14px;font:500 var(--fs-mono-sm)/1 var(--ff-mono);letter-spacing:var(--ls-mono);text-transform:uppercase;color:#fff}
.c-plate__tag b{color:var(--c-signal-on-navy);margin-right:8px;font-weight:500}
.c-plate figcaption.c-cap{display:flex;justify-content:space-between;gap:16px;padding:12px 2px 0;font:500 var(--fs-mono-sm)/1.5 var(--ff-mono);letter-spacing:var(--ls-mono);text-transform:uppercase;color:var(--c-ink-muted)}

/* ---------- Opening (shared page-opening) ---------- */
.c-opening{padding-top:var(--opening-top);padding-bottom:var(--section-y-tight)}
.c-opening .c-split{align-items:end}

/* ---------- Entry points (recognition) ---------- */
.c-entries{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--c-rule-strong)}
.c-entry{display:flex;flex-direction:column;gap:var(--s-4);min-height:220px;padding:var(--s-5) var(--s-5) var(--s-5) 0;border-bottom:1px solid var(--c-rule);text-decoration:none;position:relative}
.c-entry+.c-entry{padding-left:var(--s-5);border-left:1px solid var(--c-rule)}
.c-entry .num{font:500 var(--fs-mono)/1 var(--ff-mono);letter-spacing:.1em;color:var(--c-signal-text)}
.c-entry .go{margin-top:auto;font-size:var(--fs-small);text-decoration:underline;text-underline-offset:7px}
.c-entry::before{content:"";position:absolute;left:0;right:0;top:-1px;height:2px;background:var(--c-signal);transform:scaleX(0);transform-origin:left;transition:transform var(--dur-base) var(--ease)}
.c-entry+.c-entry::before{left:var(--s-5)}
.c-entry:hover::before,.c-entry[aria-current]::before{transform:none}
@media (max-width:1100px){.c-entries{grid-template-columns:1fr 1fr}.c-entry:nth-child(3){padding-left:0;border-left:0}.c-entry:nth-child(3)::before{left:0}}
@media (max-width:600px){.c-entries{grid-template-columns:1fr}.c-entry,.c-entry+.c-entry{min-height:0;padding:var(--s-5) 0;border-left:0}.c-entry::before,.c-entry+.c-entry::before{left:0}}

/* ---------- Chapter (Editorial family) ---------- */
.c-chapter__answers{display:grid;gap:var(--s-6)}
.c-answer+.c-answer{border-top:1px solid var(--c-rule);padding-top:var(--s-6)}
.m-navy .c-answer+.c-answer{border-color:var(--c-rule-on-navy)}
.c-chapter__foot{display:grid;grid-template-columns:7fr 5fr;gap:var(--s-6) var(--col-gap);margin-top:var(--s-9);padding-top:var(--s-7);border-top:1px solid var(--c-rule)}
.m-navy .c-chapter__foot{border-color:var(--c-rule-on-navy)}
.c-related{display:flex;flex-wrap:wrap;gap:0 var(--s-5)}
.c-next{border-left:1px solid var(--c-rule);padding-left:var(--s-6)}
.m-navy .c-next{border-color:var(--c-rule-on-navy)}
@media (max-width:900px){.c-chapter__foot{grid-template-columns:1fr}.c-next{border-left:0;border-top:1px solid var(--c-rule);padding:var(--s-5) 0 0}}

/* ---------- Ordered reference list ---------- */
.c-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--c-rule-strong)}
.c-list li{display:grid;grid-template-columns:40px 1fr;gap:var(--s-4);padding:var(--s-5) 0;border-bottom:1px solid var(--c-rule)}
.c-list .num{font:500 var(--fs-mono)/2.2 var(--ff-mono);color:var(--c-signal-text)}

/* ---------- Connected field (cross-cutting idea) ---------- */
.c-field{position:relative;display:grid;grid-template-columns:.9fr 1.05fr 1fr .85fr;gap:10px;height:340px}
.c-field .c-plate__img{aspect-ratio:auto;height:100%}
.c-field>div:nth-child(1){margin:14px 0 8px}.c-field>div:nth-child(3){margin-top:26px}.c-field>div:nth-child(4){margin:8px 0 16px}
.c-field svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.c-field path{fill:none;stroke:var(--c-signal);stroke-width:2;vector-effect:non-scaling-stroke}
@media (max-width:600px){.c-field{height:240px;gap:6px}}

/* ---------- Footer ---------- */
.c-footer{background:var(--c-navy);color:var(--c-on-navy);padding:var(--s-10) 0 var(--s-6)}
.c-footer__grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--s-8)}
.c-footer img{width:122px}
.c-footer address{font-style:normal;line-height:1.9}
.c-footer nav{display:flex;flex-direction:column}
.c-footer nav a{text-decoration:none;min-height:44px;display:flex;align-items:center}
.c-footer nav a:hover{text-decoration:underline;text-decoration-color:var(--c-signal-on-navy);text-underline-offset:6px}
.c-footer__note{margin-top:var(--s-8);padding-top:var(--s-5);border-top:1px solid var(--c-rule-on-navy);font-size:13px;color:var(--c-on-navy-muted)}
@media (max-width:900px){.c-footer__grid{grid-template-columns:1fr}}

/* ---------- Accordion (FAQ) ---------- */
.c-acc{border-top:1px solid var(--c-rule-strong)}
.c-acc details{border-bottom:1px solid var(--c-rule)}
.c-acc summary{list-style:none;display:flex;justify-content:space-between;gap:var(--s-5);align-items:center;min-height:56px;padding:var(--s-4) 0;cursor:pointer;font:500 var(--fs-card)/1.2 var(--ff-serif)}
.c-acc summary::-webkit-details-marker{display:none}
.c-acc summary::after{content:"+";font:400 22px/1 var(--ff-sans);color:var(--c-ink-muted)}
.c-acc details[open] summary::after{content:"−";color:var(--c-signal)}
.c-acc summary:hover{text-decoration:underline;text-decoration-color:var(--c-signal);text-underline-offset:6px}
.c-acc .ans{padding:0 0 var(--s-6);max-width:var(--measure)}

/* ---------- Fields (intake) ---------- */
.c-form{background:var(--c-paper);border:1px solid var(--c-rule);border-top:2px solid var(--c-rule-strong);padding:clamp(20px,3vw,40px)}
.c-fld{display:grid;gap:8px;margin-bottom:var(--s-5)}
.c-fld label{font-weight:500;font-size:var(--fs-small)}
.c-fld .hint{font-size:14px;color:var(--c-ink-muted)}
.c-input{min-height:48px;padding:12px 14px;border:1px solid var(--c-field-border);background:var(--c-field-bg);font:400 16px/1.4 var(--ff-sans);color:var(--c-ink);border-radius:0}
.c-input:hover{border-color:var(--c-ink)}
.c-input:focus-visible{outline:var(--focus-w) solid var(--c-focus);outline-offset:1px;border-color:var(--c-ink)}
.c-input[disabled]{background:var(--c-canvas);color:var(--c-ink-muted);border-style:dashed}
.c-fld.is-error .c-input{border:2px solid var(--c-error)}
.c-fld .err{display:flex;gap:8px;color:var(--c-error);font-size:14px;font-weight:500}
.c-fld .err::before{content:"!";display:inline-grid;place-items:center;width:18px;height:18px;border:1.5px solid currentColor;border-radius:50%;font:700 11px/1 var(--ff-sans);flex:none}
.c-notice{padding:var(--s-3) var(--s-4);background:var(--c-canvas);border:1px solid var(--c-rule);font-size:14px}
.c-steps{display:flex;gap:6px;margin-bottom:var(--s-5)}
.c-steps i{flex:1;height:2px;background:var(--c-rule)}
.c-steps i.done{background:var(--c-ink)}
.c-steps i.now{background:var(--c-signal)}
.c-success{border-top:2px solid var(--c-success);padding-top:var(--s-5)}

@media (prefers-reduced-motion:reduce){.costello-system *{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

/* Pilot hardening: shared patterns, not viewport-specific headline patches. */
.costello-system :is(.c-wrap,.c-split,.c-chapter__foot,.c-footer__grid)>*{min-width:0}
.costello-system :is(h1,h2,h3,p,a,li,address){overflow-wrap:anywhere}
.costello-system .t-groups>span{max-width:100%}
.costello-system .c-chapter__foot--ref{grid-template-columns:4fr 8fr}
@media(max-width:900px){.costello-system .c-chapter__foot--ref{grid-template-columns:1fr}}
.costello-system .c-phone{min-height:44px;align-content:center}
.costello-system .c-footer address a{display:inline-flex;align-items:center;min-height:44px}
.costello-system .c-btn{line-height:1.4;padding-block:12px;text-align:center}
.costello-system .c-nav a{min-height:44px;display:inline-flex;align-items:center}
.costello-system .c-menu-dialog{inset:0 0 0 auto;margin:0;width:min(100%,480px);height:100dvh;max-width:100%;max-height:100dvh;border:0;padding:24px;background:var(--c-canvas);color:var(--c-ink);overflow:auto}
.costello-system .c-menu-dialog::backdrop{background:rgb(15 28 43 / 60%)}
.costello-system .c-menu-top{display:flex;align-items:center;justify-content:space-between;gap:16px}
.costello-system .c-menu-close{min-width:44px;min-height:44px;padding:10px 14px;border:1px solid var(--c-rule-strong);color:inherit;background:transparent;font:500 14px var(--ff-sans)}
.costello-system .c-menu-dialog nav{display:grid;margin-block:32px}
.costello-system .c-menu-dialog nav a{display:flex;align-items:center;min-height:56px;border-bottom:1px solid var(--c-rule);text-decoration:none;font:500 28px/1.2 var(--ff-serif)}
.costello-system .c-menu-dialog nav a[aria-current=page]{text-decoration:underline;text-decoration-color:var(--c-signal);text-underline-offset:8px}
.costello-system .c-brand{display:inline-flex;align-items:center;min-width:44px;min-height:44px}
.costello-system .c-nav a{min-width:44px;justify-content:center}
.costello-system .c-link{min-width:44px}
/* Site header: three clear zones and a consistent scroll material. */
.costello-system .c-header--site{background:rgb(252 251 248 / 98%);border-bottom:1px solid rgb(23 40 59 / 24%);box-shadow:0 3px 16px rgb(23 40 59 / 7%);backdrop-filter:blur(20px) saturate(135%);-webkit-backdrop-filter:blur(20px) saturate(135%);transition:background-color var(--dur-tone),color var(--dur-tone),box-shadow var(--dur-tone)}
.costello-system .c-header--site .c-wrap{display:grid;grid-template-columns:minmax(140px,1fr) auto minmax(300px,1fr);gap:32px}
.costello-system .c-header--site .c-brand{justify-self:start}
.costello-system .c-header--site .c-nav{margin:0;gap:24px;justify-content:center}
.costello-system .c-header-actions{display:flex;align-items:center;justify-content:flex-end;gap:24px;padding-left:24px;border-left:1px solid var(--c-rule);min-width:0}
.costello-system .c-header-actions .c-btn{white-space:nowrap;padding-inline:20px}
.costello-system .c-header--site.is-dark{background:rgb(23 40 59 / 88%);color:var(--c-on-navy);border-color:rgb(247 243 236 / 20%);box-shadow:0 6px 24px rgb(15 28 43 / 18%)}
.costello-system .c-header--site.is-dark .c-header-actions{border-color:var(--c-rule-on-navy)}
.costello-system .c-header--site.is-dark .c-phone small{color:var(--c-on-navy-muted)}
.costello-system .c-header--site.is-dark .c-nav a:hover{color:var(--c-on-navy)}
.costello-system .c-header--site.is-dark :is(.c-call,.c-menu-btn){border-color:rgb(247 243 236 / 40%)}
.costello-system .c-header--site.is-dark .c-btn .arr{color:var(--c-signal-text)}
.costello-system .c-header--site.is-dark .c-btn:hover{background:var(--c-paper)}
.costello-system .c-header--site.is-dark :focus-visible{outline-color:var(--c-signal-on-navy)}
@media(max-width:1200px){.costello-system .c-header--site .c-wrap{gap:20px}.costello-system .c-header--site .c-nav{gap:16px}.costello-system .c-header-actions{gap:16px;padding-left:16px}}
@media(max-width:1100px){.costello-system .c-header--site .c-wrap{grid-template-columns:minmax(122px,1fr) auto minmax(180px,1fr)}}
@media(max-width:900px){.costello-system .c-header--site .c-wrap{grid-template-columns:auto 1fr;gap:16px}.costello-system .c-header--site .c-nav{display:none}.costello-system .c-header-actions{padding-left:0;border-left:0;gap:12px}.costello-system .c-header-actions .c-call{margin:0}}
/* Offset panels stay inside their grid track; captions occupy their own row. */
.costello-system .c-field{grid-template-rows:minmax(0,1fr)}
.costello-system .c-field .c-plate__img{height:auto;min-height:0;align-self:stretch}
.costello-system .c-plate figcaption.c-cap{display:block;position:relative;padding:18px 2px 4px;line-height:1.65;color:var(--c-ink);overflow-wrap:anywhere}
.costello-system .m-navy .c-plate figcaption.c-cap{color:var(--c-on-navy)}
/* Editorial eyebrows are ink; orange belongs to sequence, not the whole label. */
.costello-system .t-eyebrow{color:var(--c-navy)}
.costello-system .m-navy .t-eyebrow{color:var(--c-on-navy)}

/* Light glass over navy sections; navy glass over light sections. */
.costello-system .c-header--site.is-scrolled:not(.is-dark){background:rgb(252 251 248 / 92%);box-shadow:0 6px 24px rgb(15 28 43 / 12%)}