/* ============================================================
   ImageSpecHub — design system v1.0
   Subject: seller product image requirements checker
   Signature: the check card (a real per-rule PASS/WARN/FAIL list,
              computed by assets/checker.js, rendered on every page).
   Tokens / components documented in DESIGN.md (07 must use these
   component classes; machine-checkable gate).
   ============================================================ */

/* ---------- tokens ---------- */
:root{
  --paper:#FDFCF8;      /* receipt paper white */
  --ink:#1C2B33;        /* ink (body text) */
  --ledger:#2F5270;     /* spec-sheet blue (titles, links, table rules) */
  --copy:#B4231C;       /* carbon-copy red (label, CTA, FAIL) */
  --cash:#2E7D5B;       /* pass-green, check card only */
  --warn:#B47A1F;       /* warn-amber, check card only */
  --line:#D8D2C4;       /* printed hairline (borders) */
  --tint:#F2EFE6;       /* light paper (block backgrounds) */
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --display:"Fraunces",Georgia,"Times New Roman",serif;
  --body:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --radius:3px;         /* crisp, printed feel — almost square */
  --shadow:0 1px 0 var(--line),0 6px 18px rgba(28,43,51,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--body);color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
.wrap{max-width:1000px;margin:0 auto;padding:0 22px}

/* ---------- header ---------- */
header.site{border-bottom:1px solid var(--line);background:var(--paper)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;min-height:58px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.01em;color:var(--ink);text-decoration:none;font-size:1.02rem}
.brand .mark{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border:1px solid var(--line);background:var(--tint);border-radius:var(--radius);font-family:var(--mono);font-size:.7rem;color:var(--copy)}
nav.top{display:flex;gap:18px;font-size:.92rem}
nav.top a{color:var(--ledger);text-decoration:none;border-bottom:1px solid transparent}
nav.top a:hover{border-bottom-color:var(--copy)}

/* ---------- hero ---------- */
.hero{padding:52px 0 40px;border-bottom:1px solid var(--line)}
.hero .kicker{font-family:var(--mono);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--copy);margin:0 0 14px}
.hero h1{font-family:var(--display);font-weight:700;font-size:clamp(1.9rem,4.4vw,3rem);line-height:1.12;margin:0 0 14px;color:var(--ink);letter-spacing:-.01em}
.hero h1 em{font-style:normal;color:var(--ledger)}
.hero .lede{font-size:1.06rem;max-width:56ch;color:#44525c;margin:0}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center}
@media(max-width:760px){.hero-grid{grid-template-columns:1fr}.hero{padding:36px 0 28px}}

/* ---------- signature: check card ---------- */
.check-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px;position:relative;font-size:.84rem;overflow:hidden}
.check-card .cc-head{display:flex;justify-content:space-between;align-items:baseline;border-bottom:2px solid var(--ink);padding-bottom:8px;margin-bottom:12px}
.check-card .cc-title{font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--copy)}
.check-card .cc-file{font-family:var(--mono);font-size:.68rem;color:#66707b;text-align:right}
.check-card .cc-rows{display:flex;flex-direction:column;gap:0}
.check-card .cc-row{display:flex;justify-content:space-between;gap:14px;border-bottom:1px dashed var(--line);padding:8px 2px;font-size:.84rem}
.check-card .cc-row:last-child{border-bottom:none}
.check-card .cc-row .r-name{color:#333f48}
.check-card .cc-row .r-val{font-family:var(--mono);text-align:right;white-space:nowrap}
.check-card .cc-row.pass .r-val{color:var(--cash)}
.check-card .cc-row.warn .r-val{color:var(--warn)}
.check-card .cc-row.fail .r-val{color:var(--copy)}
.check-card .cc-foot{margin-top:12px;padding-top:8px;border-top:1px dashed var(--line);font-size:.72rem;color:#66707b;font-family:var(--mono)}

/* ---------- sections ---------- */
section.block{padding:40px 0;border-bottom:1px solid var(--line)}
.section-label{font-family:var(--mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--copy);margin:0 0 8px}
h2.sec-title{font-family:var(--display);font-weight:700;font-size:1.5rem;margin:0 0 18px;color:var(--ink)}

/* ---------- category grid ---------- */
.cats{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;margin-top:6px}
.card{display:block;border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:14px 16px;text-decoration:none;color:var(--ink);transition:border-color .12s ease,box-shadow .12s ease}
.card:hover{border-color:var(--ledger);box-shadow:var(--shadow)}
.card .c-name{font-weight:600;font-size:.95rem;display:flex;align-items:baseline;gap:8px}
.card .c-name .arrow{font-family:var(--mono);color:var(--copy);font-size:.8rem}
.card .c-meta{font-size:.8rem;color:#66707b;margin-top:3px}
.cat-label{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:#8a8f96;margin:20px 0 8px}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;counter-reset:step}
.step{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:16px}
.step .n{font-family:var(--mono);color:var(--copy);font-size:.8rem;display:block;margin-bottom:6px}
.step b{display:block;margin-bottom:4px}
.step p{margin:0;font-size:.86rem;color:#44525c}
@media(max-width:760px){.steps{grid-template-columns:1fr}}

/* ---------- checker tool ---------- */
.checker{border:1px solid var(--line);border-radius:var(--radius);background:var(--tint);padding:20px;margin:18px 0}
.checker .drop{border:2px dashed var(--line);border-radius:var(--radius);background:#fff;padding:26px 18px;text-align:center;cursor:pointer;transition:border-color .12s ease}
.checker .drop:hover,.checker .drop.drag{border-color:var(--ledger)}
.checker .drop b{display:block;font-size:.98rem;margin-bottom:4px}
.checker .drop span{font-size:.82rem;color:#66707b}
.checker .url-row{display:flex;gap:10px;margin-top:12px}
.checker input[type=url]{flex:1;border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:10px 12px;font-family:var(--mono);font-size:.84rem;color:var(--ink)}
.checker input[type=url]:focus{outline:2px solid var(--copy);outline-offset:0}
.checker .btn{background:var(--copy);color:#fff;border:1px solid var(--copy);border-radius:var(--radius);padding:10px 18px;font-weight:600;font-size:.9rem;cursor:pointer;white-space:nowrap}
.checker .btn:hover{background:#9c1e17}
.checker .btn.ghost{background:transparent;color:var(--ledger);border-color:var(--line)}
.checker .btn:disabled{opacity:.5;cursor:not-allowed}
.checker .out{margin-top:14px}
.checker .out .row{display:flex;justify-content:space-between;gap:14px;padding:8px 2px;border-bottom:1px dashed var(--line);font-size:.88rem}
.checker .out .row:last-child{border-bottom:none}
.checker .out .row .k{color:#333f48}
.checker .out .row .v{font-family:var(--mono);text-align:right}
.checker .out .row.pass .v{color:var(--cash);font-weight:600}
.checker .out .row.warn .v{color:var(--warn)}
.checker .out .row.fail .v{color:var(--copy);font-weight:600}
.checker .note{margin-top:10px;font-size:.76rem;color:#66707b;font-family:var(--mono)}
.checker .err{color:var(--copy);font-size:.85rem;margin-top:10px}

/* ---------- data table (platform specs) ---------- */
.data-table{width:100%;border-collapse:collapse;font-size:.9rem;background:#fff}
.data-table th{font-family:var(--mono);font-size:.64rem;letter-spacing:.12em;text-transform:uppercase;text-align:left;color:#8a8f96;border-bottom:1px solid var(--line);padding:8px 10px}
.data-table td{border-bottom:1px dashed var(--line);padding:9px 10px;vertical-align:top}
.data-table tr:last-child td{border-bottom:none}
.src-note{font-size:.76rem;color:#8a8f96;margin-top:6px;font-family:var(--mono)}

/* ---------- FAQ ---------- */
.faq details{border:1px solid var(--line);border-radius:var(--radius);background:#fff;margin-bottom:8px}
.faq summary{cursor:pointer;padding:12px 16px;font-weight:600;font-size:.92rem;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--copy);font-size:1rem}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 16px 14px;margin:0;font-size:.88rem;color:#44525c}

/* ---------- CTA ---------- */
.cta{background:var(--ink);color:var(--paper);border-radius:var(--radius);padding:24px 26px;margin-top:26px}
.cta h3{font-family:var(--display);margin:0 0 6px;font-size:1.25rem;color:var(--paper)}
.cta p{margin:0 0 14px;font-size:.9rem;color:#c9d2d9}
.btn{display:inline-block;background:var(--copy);color:#fff;text-decoration:none;font-weight:600;font-size:.92rem;padding:10px 18px;border-radius:var(--radius);border:1px solid var(--copy)}
.btn:hover{background:#9c1e17}
.btn.ghost{background:transparent;color:var(--paper);border-color:#5b6b78;margin-left:8px}
.btn.ghost:hover{border-color:var(--paper)}

/* ---------- BLUF (tool pages) ---------- */
.bluf{font-size:1.04rem;max-width:60ch;color:#333f48;margin:0 0 6px}

/* ---------- related / breadcrumb / footer ---------- */
.rel{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.crumb{font-family:var(--mono);font-size:.72rem;color:#8a8f96;margin-bottom:18px}
.crumb a{color:var(--ledger);text-decoration:none}
footer.site{border-top:1px solid var(--line);padding:22px 0;font-size:.82rem;color:#66707b}
footer.site .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ---------- utility ---------- */
.mt24{margin-top:24px}
a{color:var(--ledger)}
:focus-visible{outline:2px solid var(--copy);outline-offset:2px}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.block ul{margin:0 0 4px;padding-left:20px}
.block li{margin-bottom:10px}
.block li b{color:var(--ink)}