/* AI Image Authenticity Checker - app.css (no framework, no build step) */
/* To self-host Inter, add woff2 files in /assets/fonts and uncomment:
@font-face{font-family:Inter;src:url(/assets/fonts/Inter-Variable.woff2) format("woff2");font-weight:100 900;font-display:swap}
*/
:root{
  --teal:#0f5c63; --teal-d:#0b4850; --green:#2f7d4a; --green-b:#3a9d5d; --amber:#b86e00; --amber-b:#f5a623; --red:#c8321f; --red-b:#e8503a;
  --text:#1b2a33; --muted:#5b6b76; --bg:#f6f7f8; --card:#fff; --line:#e4e8eb; --grey:#8a98a2; --grey-bg:#eef1f3;
  --r-lg:20px; --r-md:16px; --r-sm:10px;
  --shadow:0 1px 2px rgba(16,40,50,.04),0 6px 24px rgba(16,40,50,.06);
  --font:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --sidebar-w:76px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--text);line-height:1.5;font-size:15px;
  background-color:var(--bg);
  background-image:linear-gradient(rgba(15,92,99,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(15,92,99,.045) 1px,transparent 1px);
  background-size:32px 32px}
h1,h2,h3{line-height:1.25;margin:0 0 .5em}
p{margin:0 0 1em}
a{color:var(--teal)}
a:hover{color:var(--teal-d)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ic{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.ic-xl{width:44px;height:44px;stroke-width:1.5}
.ic-warn{width:18px;height:18px;color:var(--amber-b);margin-left:6px}
.sr-only{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{position:absolute;left:12px;top:-60px;background:var(--teal);color:#fff;padding:10px 14px;border-radius:8px;z-index:100}
.skip-link:focus{top:12px}
:focus-visible{outline:3px solid #1d8fa0;outline-offset:2px;border-radius:6px}
.muted{color:var(--muted)} .small{font-size:13px}

/* App shell */
.app{display:flex;min-height:100vh}
.sidebar{position:fixed;left:16px;top:16px;bottom:16px;width:var(--sidebar-w);background:var(--card);border-radius:var(--r-lg);box-shadow:var(--shadow);border:1px solid var(--line);
  display:flex;flex-direction:column;align-items:center;padding:16px 0;z-index:20}
.sidebar-logo{width:44px;height:44px;display:grid;place-items:center;color:var(--teal);margin-bottom:18px;border-radius:12px}
.sidebar-logo .ic{width:28px;height:28px}
.sidebar-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.nav-item{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;color:var(--muted);text-decoration:none;transition:background .2s,color .2s}
.nav-item:hover{background:var(--grey-bg);color:var(--text)}
.nav-item.is-active{background:var(--teal);color:#fff}
.nav-label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.main{flex:1;min-width:0;padding:16px 16px 16px calc(var(--sidebar-w) + 32px)}
.container{background:var(--card);border-radius:var(--r-lg);box-shadow:var(--shadow);border:1px solid var(--line);padding:28px;max-width:1380px;margin:0 auto}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:20px}
.brand{margin:0;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.brand-name{font-weight:700;color:var(--teal)}
.brand-tag{color:var(--muted);font-size:13px}
.chip{display:inline-flex;align-items:center;gap:6px;margin:0;padding:5px 12px;border-radius:999px;background:var(--grey-bg);font-size:12.5px;font-weight:600;color:var(--text)}
.chip .ic{width:14px;height:14px}
.chip-private{color:var(--teal);background:#e6f2f3}
#content{outline:none}
.page-head{margin-bottom:22px}
.page-head h1{font-size:clamp(24px,3.2vw,34px);letter-spacing:-.02em;margin-bottom:.35em}
.h1-tag{display:block;font-size:.5em;font-weight:600;color:var(--teal);letter-spacing:.02em;margin-top:4px}
.lead{font-size:17px;color:var(--muted);max-width:760px}

/* Cards and grids */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--shadow);padding:24px;min-width:0}
.container>#content>.card{margin-top:24px}
.card-title{font-size:16px;font-weight:600;margin:0 0 16px;display:flex;align-items:center}
.grid{display:grid;gap:20px;margin-bottom:20px}
.row1{grid-template-columns:1.6fr 1fr 1fr}
.row2{grid-template-columns:.9fr 1fr 1.7fr}
.info-wrap{position:relative;margin-left:8px;display:inline-flex}
.info{background:none;border:0;padding:2px;color:var(--grey);cursor:help;display:grid;place-items:center;border-radius:50%}
.info:hover,.info:focus-visible{color:var(--teal)}
.info .ic{width:17px;height:17px}
.tip{position:absolute;left:50%;top:calc(100% + 8px);transform:translateX(-50%);width:240px;background:var(--text);color:#fff;font-size:12.5px;font-weight:400;line-height:1.4;padding:10px 12px;border-radius:10px;opacity:0;visibility:hidden;transition:opacity .15s;z-index:30;pointer-events:none}
.info-wrap:hover .tip,.info:focus-visible+.tip{opacity:1;visibility:visible}

/* Preview */
.card-preview{padding:16px;display:flex}
.preview-stage{flex:1;min-height:380px;display:flex;position:relative}
.drop-area{flex:1;border:2px dashed #c5ced4;border-radius:14px;background:#fafbfb;color:var(--muted);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;cursor:pointer;font:inherit;padding:24px;transition:border-color .2s,background .2s}
.drop-area:hover,.is-dragging .drop-area,.is-dragging .upload-inner{border-color:var(--teal);background:#f0f7f8;color:var(--teal)}
.drop-title{font-weight:600;color:var(--text);font-size:16px}
.drop-sub{font-size:13px}
.preview-fig{margin:0;flex:1;position:relative;border-radius:14px;overflow:hidden;background:var(--grey-bg);display:flex;align-items:center;justify-content:center;min-height:380px}
.preview-fig[hidden]{display:none}
.preview-fig img{max-width:100%;max-height:520px;width:auto;height:auto;object-fit:contain;display:block;border-radius:14px}
.chip-on-image{position:absolute;left:14px;bottom:14px;background:rgba(255,255,255,.94);box-shadow:0 2px 8px rgba(0,0,0,.12)}
.icon-btn{width:40px;height:40px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.94);color:var(--text);display:grid;place-items:center;cursor:pointer;transition:background .2s}
.icon-btn:hover{background:#fff;color:var(--teal)}
.expand-btn{position:absolute;right:14px;top:14px;box-shadow:0 2px 8px rgba(0,0,0,.12)}
.lightbox{border:0;padding:0;background:transparent;max-width:96vw;max-height:96vh;overflow:visible}
.lightbox::backdrop{background:rgba(10,20,26,.82)}
.lightbox img{display:block;max-width:94vw;max-height:92vh;border-radius:12px;background:#fff}
.lightbox-close{position:absolute;right:8px;top:8px}

/* Gauge */
.gauge-wrap{display:flex;justify-content:center}
.gauge{width:100%;max-width:260px;height:auto;overflow:visible}
.gauge-base{stroke:#dfe4e8}
.gauge-color{transition:opacity .4s}
.gauge.is-empty .gauge-color{opacity:0}
.needle{transform-origin:100px 100px;transform:rotate(-90deg);transition:transform 1s cubic-bezier(.2,.9,.25,1.1)}
.needle line{stroke:var(--text)} .needle circle{fill:var(--text)}
.gauge.is-empty .needle line{stroke:#b6c0c7} .gauge.is-empty .needle circle{fill:#b6c0c7}
.signal-label{font-size:34px;font-weight:700;text-align:center;margin:4px 0 0;letter-spacing:-.02em;line-height:1.1}
.signal-label[data-level="Low"]{color:var(--green)} .signal-label[data-level="Medium"]{color:var(--amber)} .signal-label[data-level="High"]{color:var(--red)}
.signal-label.is-empty{color:var(--grey)}
.signal-score{text-align:center;font-size:12.5px;color:var(--muted);margin:2px 0 12px;min-height:1.2em}
.bars{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:14px}
.bar{text-align:center;font-size:12px;font-weight:600;color:var(--muted)}
.bar-fill{display:block;height:8px;border-radius:99px;margin-bottom:5px;background:var(--grey-bg);transition:background .3s,opacity .3s}
.bar[data-level="Low"].is-active .bar-fill{background:var(--green-b)}
.bar[data-level="Medium"].is-active .bar-fill{background:var(--amber-b)}
.bar[data-level="High"].is-active .bar-fill{background:var(--red-b)}
.bars:not(.is-set) .bar-fill{background:var(--grey-bg)}
.bars.is-set .bar:not(.is-active) .bar-fill{opacity:.35}
.bars.is-set .bar:not(.is-active){opacity:.7}
.bars.is-set .bar[data-level="Low"]:not(.is-active) .bar-fill{background:var(--green-b)}
.bars.is-set .bar[data-level="Medium"]:not(.is-active) .bar-fill{background:var(--amber-b)}
.bars.is-set .bar[data-level="High"]:not(.is-active) .bar-fill{background:var(--red-b)}
.bar.is-active{color:var(--text)}
.signal-reason{font-size:14px;text-align:center;margin-bottom:8px;font-weight:500}
.signal-disclaimer{font-size:12px;color:var(--muted);text-align:center;margin:0}

/* Metadata */
.meta-list{margin:0}
.meta-row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
.meta-row:first-child{padding-top:0}
.meta-row dt{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:14px;flex:none}
.meta-row dt .ic{width:18px;height:18px;color:var(--teal)}
.meta-row dd{margin:0 0 0 auto;text-align:right;font-weight:600;font-size:14px;overflow-wrap:anywhere;min-width:0}
.meta-row dd.is-placeholder{color:#9aa7b0;font-weight:500}
.meta-note{font-size:13px;color:var(--text);background:#fff7e8;border:1px solid #f6dcaa;border-radius:10px;padding:10px 12px;margin:12px 0 0}
.status-compact{margin-top:12px}

/* Status rows */
.status-list{list-style:none;margin:0;padding:0}
.status-row{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:start;padding:12px 0;border-bottom:1px solid var(--line)}
.status-row:first-child{padding-top:0} .status-row:last-child{border-bottom:0;padding-bottom:0}
.s-icon{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;flex:none}
.s-icon .ic{width:17px;height:17px;stroke-width:2.6}
.status-row[data-state="none"] .s-icon{background:#e3f3e8;color:var(--green)}
.status-row[data-state="possible"] .s-icon{background:#fdf0d5;color:var(--amber)}
.status-row[data-state="unchecked"] .s-icon{background:var(--grey-bg);color:var(--muted)}
.s-title{font-weight:600;font-size:14.5px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.s-detail{font-size:13px;color:var(--muted);margin-top:2px}
.s-state{font-size:12.5px;font-weight:700;white-space:nowrap;padding-top:5px}
.status-row[data-state="none"] .s-state{color:var(--green)}
.status-row[data-state="possible"] .s-state{color:var(--amber)}
.status-row[data-state="unchecked"] .s-state{color:var(--muted)}
.badge{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;background:var(--grey-bg);color:var(--muted);border-radius:6px;padding:2px 6px}
.s-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.s-actions .btn{padding:7px 12px;font-size:13px}
.s-extra{grid-column:2 / 4}

/* Skeleton */
.is-loading .meta-row dd,.is-loading .s-detail,.is-loading .s-state,.is-loading .signal-reason,.is-loading .signal-label{color:transparent!important;border-radius:6px;background:linear-gradient(90deg,#eef1f3 25%,#f8f9fa 50%,#eef1f3 75%);background-size:200% 100%;animation:shimmer 1.2s infinite linear;user-select:none}
.is-loading .s-icon{opacity:.5}
.is-loading .s-actions{display:none}
@keyframes shimmer{to{background-position:-200% 0}}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;border:1px solid transparent;padding:11px 18px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;transition:background .2s,border-color .2s,color .2s}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-d);color:#fff}
.btn-secondary{background:#fff;border-color:var(--teal);color:var(--teal)}
.btn-secondary:hover:not(:disabled){background:#e6f2f3}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{background:var(--grey-bg)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.is-picked{background:#e6f2f3;border-color:var(--teal);color:var(--teal-d)}

/* Upload tile */
.card-upload{display:flex;flex-direction:column;gap:16px;align-items:stretch;border:2px dashed #c5ced4;box-shadow:none;background:#fafbfb;justify-content:center}
.upload-inner{background:none;border:0;font:inherit;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:6px;cursor:pointer;padding:8px}
.card-upload:hover{border-color:var(--teal)}

/* Actions row */
.tool-actions{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;flex-wrap:wrap}
.enhanced{max-width:620px}
.enhanced-note{font-size:13px;color:var(--muted);margin:6px 0 0}
.switch{display:inline-flex;align-items:center;gap:10px;cursor:pointer;font-weight:600}
.switch input{position:absolute;opacity:0;width:1px;height:1px}
.switch-track{width:42px;height:24px;border-radius:99px;background:#c5ced4;position:relative;transition:background .2s}
.switch-track::after{content:"";position:absolute;left:3px;top:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:transform .2s;box-shadow:0 1px 3px rgba(0,0,0,.3)}
.switch input:checked+.switch-track{background:var(--teal)}
.switch input:checked+.switch-track::after{transform:translateX(18px)}
.switch input:focus-visible+.switch-track{outline:3px solid #1d8fa0;outline-offset:2px}
.action-buttons{margin-left:auto}

/* History */
.history-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.history-head .card-title{margin:0}
.history-list{list-style:none;margin:12px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.history-item{display:flex;gap:12px;align-items:center;width:100%;text-align:left;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px;font:inherit;color:inherit;cursor:pointer}
.history-item:hover{border-color:var(--teal);background:#f7fbfb}
.history-item img{width:56px;height:56px;border-radius:8px;object-fit:cover;background:var(--grey-bg);flex:none}
.history-meta{min-width:0}
.history-name{font-weight:600;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.history-sub{font-size:12.5px;color:var(--muted)}

/* Prose pages */
.prose h1{font-size:clamp(26px,3.4vw,36px);letter-spacing:-.02em}
.prose h2{font-size:22px;margin-top:1.4em}
.prose h3{font-size:17px;margin-top:1.1em}
.prose>p,.prose>ul,.prose>h2,.prose>h3,.prose>h1{max-width:820px}
.prose li{margin-bottom:.5em}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.steps h3{margin-top:0}
.prose code{background:var(--grey-bg);padding:1px 6px;border-radius:6px;font-size:.9em}

/* Footer */
.site-footer{margin-top:32px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.footer-links{list-style:none;display:flex;gap:18px;padding:0;margin:0 0 10px;flex-wrap:wrap}
.disclaimer-line{margin-bottom:10px}
.copyright{margin:0}

/* Print report (screen: hidden) */
.print-report{display:none}

@media (max-width:1100px){
  .row1{grid-template-columns:1fr 1fr}
  .card-preview{grid-column:1 / -1}
  .row2{grid-template-columns:1fr 1fr}
  .card-review{grid-column:1 / -1}
}
@media (max-width:900px){
  .row1,.row2{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .preview-stage,.preview-fig{min-height:280px}
}
@media (max-width:700px){
  .sidebar{top:auto;left:12px;right:12px;bottom:12px;width:auto;height:64px;flex-direction:row;justify-content:center;padding:0 8px}
  .sidebar-logo{display:none}
  .sidebar-list{flex-direction:row;gap:6px}
  .main{padding:10px 10px 90px}
  .container{padding:18px}
  .card{padding:18px}
  .tip{left:0;transform:none}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
@media (prefers-contrast:more){:root{--muted:#3d4b55;--line:#b6c0c7}}

@media print{
  body{background:#fff;font-size:12pt}
  .sidebar,.topbar,.page-head,.tool,#history,.prose,.site-footer,.skip-link,.lightbox{display:none!important}
  .main{padding:0}.container{box-shadow:none;border:0;padding:0}
  .print-report{display:block!important}
  .print-report h1{font-size:20pt;margin-bottom:4pt}
  .print-report h2{font-size:13pt;margin:14pt 0 6pt}
  .print-report table{width:100%;border-collapse:collapse}
  .print-report td,.print-report th{border-bottom:1px solid #ccc;padding:4pt 6pt;text-align:left;vertical-align:top;font-size:10.5pt}
  .print-report img{max-width:240px;max-height:240px;border-radius:6px}
  .print-report .pr-signal{font-size:22pt;font-weight:700}
  .print-report .pr-note{font-size:9.5pt;color:#444}
}

/* Toast */
.toast{position:fixed;left:50%;bottom:90px;transform:translate(-50%,20px);background:var(--text);color:#fff;padding:12px 18px;border-radius:12px;font-size:14px;max-width:min(92vw,520px);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:60}
.toast.is-visible{opacity:1;transform:translate(-50%,0)}
.history-name{display:block}.history-sub{display:block}
.history-meta{display:block}
.history-item{max-width:100%}
.s-extra-text{flex-basis:100%;margin:2px 0 0}