/* TowDigital shared interface: design tokens, layout and components.
   Layout adapts to phone (<600px), tablet (600-1023px) and desktop (>=1024px). */
:root{
  /* Palette drawn from the TowDigital logo: charcoal/black surfaces, flat gold actions, white/light-gray text. */
  --brand:#0b0b0c;--brand-2:#161618;--gold:#f5b800;--accent:#f5b800;--accent-strong:#ffcb2e;--accent-soft:#2c2412;--on-accent:#111111;
  --focus:#ffffff;--danger:#ff8f75;--danger-soft:#3a1c15;
  --bg:#111214;--surface:#1b1c1f;--surface-2:#232428;--line:#33353a;--line-strong:#4b4e55;
  --text:#f3f3f1;--muted:#aeb0b5;--on-brand:#ffffff;
  --radius:14px;--radius-sm:10px;--shadow:0 1px 2px #0008,0 8px 24px #0006;
  --gutter:clamp(14px,3.2vw,32px);--tap:48px;
  color-scheme:dark;
  font-family:"Segoe UI Variable Text","Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--text);background:var(--bg);font-size:16px;line-height:1.5;
  -webkit-text-size-adjust:100%;text-size-adjust:100%;
}
@media print{:root{--bg:#fff;--surface:#fff;--surface-2:#fff;--line:#999;--line-strong:#777;--text:#000;--muted:#333;--accent:#000;--accent-strong:#000;--accent-soft:#fff;color-scheme:light}}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--bg)}
body{margin:0;min-height:100vh;min-height:100dvh;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}

/* Header / app bar */
header{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  background:var(--brand);color:var(--on-brand);border-bottom:2px solid var(--gold);
  padding:calc(12px + env(safe-area-inset-top)) max(var(--gutter),calc((100vw - 1200px)/2),env(safe-area-inset-right)) 12px max(var(--gutter),calc((100vw - 1200px)/2),env(safe-area-inset-left));
  box-shadow:0 2px 12px #0009}
header .wordmark{font-weight:800;font-style:italic;letter-spacing:-.2px}header .brand-tow{color:var(--gold)}
header strong{display:flex;align-items:center;gap:10px;font-size:20px;letter-spacing:.2px;line-height:1.15}
header .brand-logo{flex:none;width:40px;height:40px;border-radius:10px;display:block}
small{display:block;font-size:11px;font-weight:500;letter-spacing:1.2px;text-transform:uppercase;opacity:.75}
header>span{font-size:13px;font-weight:600;padding:6px 12px;border-radius:999px;background:#ffffff1f;border:1px solid #ffffff33;white-space:nowrap}
header a{color:var(--on-brand);text-decoration:none;font-size:14px;font-weight:600;padding:8px 14px;border-radius:999px;background:#ffffff1a;border:1px solid #ffffff2e;display:inline-flex;align-items:center;min-height:40px}
header a:hover{background:#ffffff2e}

/* Page */
main{max-width:880px;margin:0 auto;padding:var(--gutter);padding-left:max(var(--gutter),env(safe-area-inset-left));padding-right:max(var(--gutter),env(safe-area-inset-right));padding-bottom:calc(var(--gutter) + env(safe-area-inset-bottom))}
h1{font-size:clamp(24px,3.2vw,30px);line-height:1.2;margin:8px 0 12px;letter-spacing:-.3px}
h2{font-size:clamp(19px,2.2vw,22px);line-height:1.25;margin:28px 0 12px;letter-spacing:-.2px}
h3{font-size:17px;margin:22px 0 10px}
p{line-height:1.55}
a{color:var(--accent)}
section{margin-bottom:24px}

/* Surfaces */
#access,#editor{background:var(--surface);padding:clamp(18px,3vw,32px);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--line)}
#access{max-width:560px;margin:clamp(8px,4vh,40px) auto 24px}
#access>p{color:var(--muted)}
#access form+form{margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}
#access h2{margin-top:0}

/* Forms */
label{display:block;font-weight:600;font-size:15px;margin:16px 0}
input,select,textarea{display:block;width:100%;min-height:var(--tap);font:inherit;font-size:16px;margin-top:6px;padding:11px 13px;
  border:1px solid var(--line-strong);border-radius:var(--radius-sm);background:var(--surface);color:inherit;
  transition:border-color .15s,box-shadow .15s}
input:hover,select:hover,textarea:hover{border-color:var(--muted)}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 22%,transparent);outline:none}
textarea{resize:vertical;min-height:96px}
select{appearance:none;-webkit-appearance:none;padding-right:40px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23aeb0b5' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center;background-size:18px}
input[type=file]{padding:9px;background:var(--surface-2);border-style:dashed;cursor:pointer;font-size:15px}
input[type=file]::file-selector-button{font:inherit;font-weight:600;border:0;border-radius:8px;padding:8px 14px;margin-right:12px;background:var(--accent-soft);color:var(--accent-strong);cursor:pointer}
input:user-invalid,select:user-invalid,textarea:user-invalid{border-color:var(--danger)}
fieldset{border:0;padding:0;margin:0;min-width:0}
legend{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* Buttons */
button{font:inherit;font-weight:600;font-size:16px;min-height:var(--tap);border:1px solid transparent;border-radius:var(--radius-sm);padding:11px 20px;
  background:var(--accent);color:var(--on-accent);cursor:pointer;touch-action:manipulation;transition:background-color .15s,box-shadow .15s,transform .05s}
button:hover{background:var(--accent-strong)}
button:active{transform:translateY(1px)}
button:disabled{opacity:.5;cursor:wait;transform:none}
button.secondary{background:var(--surface-2);color:var(--text);border-color:var(--line)}
button.secondary:hover{background:var(--line)}
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
#login button:not(.reveal),#offline-unlock button:not(.reveal){width:100%;margin-top:8px}

.toolbar{display:flex;gap:10px;justify-content:space-between;align-items:center;flex-wrap:wrap;margin:16px 0}
.toolbar h1{margin:0}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
.grid label{margin:10px 0}

/* Status messages */
#notice{padding:12px 16px;background:var(--accent-soft);color:var(--text);border-radius:var(--radius-sm);border-left:4px solid var(--accent);margin:0 0 16px;font-size:15px}
#notice:empty{display:none}
#notice.error{background:var(--danger-soft);color:var(--danger);border-left-color:var(--danger)}
#shell-state,#save-state,#session-state,#plate-state,#vin-state,#decode-state,#signature-state,#vin-help,#decode-help{font-size:14px;color:var(--muted)}
#shell-state{text-align:center;margin-top:32px}
[role=status]:empty{margin:0}

/* Field workspace */
#workspace>.toolbar{margin-top:4px}
#new-tow{width:100%;min-height:56px;font-size:17px;box-shadow:var(--shadow)}
#new-tow::before{content:"+";font-size:22px;line-height:1;margin-right:10px;font-weight:500}
#drafts{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
#drafts:empty::before{content:"No drafts on this device.";color:var(--muted);font-size:15px}
#drafts button{display:block;width:100%;height:100%;text-align:left;margin:0;padding:14px 16px;background:var(--surface);color:var(--text);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);font-weight:600;overflow-wrap:anywhere;line-height:1.4}
#drafts button:hover{border-color:var(--accent);background:var(--surface)}
#editor{margin-top:24px;scroll-margin-top:90px}
#editor>h2{margin-top:0;font-size:15px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--accent-strong)}
/* Step progress bar derived from the visible step (no script changes). */
#editor>h2::after{content:"";display:block;height:6px;margin-top:10px;border-radius:999px;
  background:linear-gradient(90deg,var(--accent) var(--progress,20%),var(--line) var(--progress,20%))}
#editor:has([data-step="1"]:not([hidden])){--progress:40%}
#editor:has([data-step="2"]:not([hidden])){--progress:60%}
#editor:has([data-step="3"]:not([hidden])){--progress:80%}
#editor:has([data-step="4"]:not([hidden])){--progress:100%}
#intake>.toolbar:last-child{position:sticky;bottom:0;z-index:5;margin:24px calc(-1 * clamp(18px,3vw,32px)) calc(-1 * clamp(18px,3vw,32px));
  padding:12px clamp(18px,3vw,32px) calc(12px + env(safe-area-inset-bottom));background:color-mix(in srgb,var(--surface) 92%,transparent);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-top:1px solid var(--line);border-radius:0 0 var(--radius) var(--radius)}
#intake>.toolbar:last-child #next{margin-left:auto}
#vin-suggestions,#plate-suggestions{justify-content:flex-start}
#vin-suggestions:empty,#plate-suggestions:empty{display:none}
#decode-result:not(:empty){padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-2);margin:12px 0}
#decode-result button{margin-top:12px}
#review dl{padding:16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-2)}
#submit-tow{width:100%;min-height:56px;font-size:17px}
canvas{display:block;width:100%;height:auto;background:#fff;border:2px dashed var(--line-strong);border-radius:var(--radius-sm);touch-action:none;margin:12px 0}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-top:12px}
.gallery figure{margin:0;padding:8px;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-sm);min-width:0}
.gallery img{display:block;width:100%;aspect-ratio:4/3;height:auto;object-fit:cover;border-radius:8px}
.gallery figcaption{font-size:13px;margin-top:6px;overflow-wrap:anywhere}
.gallery button{width:100%;margin-top:6px;min-height:40px;padding:6px 10px;font-size:14px}
dl{display:grid;grid-template-columns:minmax(110px,1fr) 2fr;gap:8px 16px;margin:0}
dt{font-weight:600;color:var(--muted)}
dd{margin:0;overflow-wrap:anywhere}
#plate-preview{display:block;max-width:100%;max-height:220px;object-fit:contain;border-radius:8px;margin:8px 0}
[hidden]{display:none!important}

/* Keep focused/scrolled-to items clear of the sticky header and the sticky step buttons. */
html{scroll-padding-top:96px;scroll-padding-bottom:96px}
.hint,#photo-state,#plate-note{font-size:14px;color:var(--muted)}
.optional{font-weight:400;color:var(--muted);font-size:13px}
button.link{background:none;border:0;color:var(--accent-strong);padding:6px 0;min-height:var(--tap);text-align:left;font-weight:600;text-decoration:underline;text-underline-offset:3px}
button.link:hover{background:none;color:var(--text)}
/* Password / passphrase with Show-Hide */
.secret{display:flex;gap:8px;align-items:stretch;margin:6px 0 16px}
.secret input{margin:0;flex:1 1 auto;min-width:0}
.secret .reveal{flex:none;min-width:76px;padding:0 14px;background:var(--surface-2);color:var(--text);border-color:var(--line-strong)}
.reveal[aria-pressed=true]{background:var(--accent-soft);color:var(--accent-strong);border-color:var(--accent)}
/* File pickers styled as buttons (the native input stays available to assistive tech) */
label.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:16px;min-height:var(--tap);margin:8px 8px 8px 0;padding:11px 18px;border-radius:var(--radius-sm);background:var(--accent);color:var(--on-accent);cursor:pointer;position:relative;text-align:center}
label.button.secondary{background:var(--surface-2);color:var(--text);border:1px solid var(--line)}
label.button input[type=file]{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;padding:0;cursor:pointer;min-height:0}
label.button:focus-within{outline:3px solid var(--focus);outline-offset:2px}
label.button:has(input:disabled){opacity:.5;cursor:not-allowed}
/* Plate + No plate */
.plate-row{display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap}
.plate-row .grow{flex:1 1 220px;margin-bottom:0}
label.check{display:flex;align-items:center;gap:10px;min-height:var(--tap);margin:0 0 0 0;padding:0 14px;border:1px solid var(--line-strong);border-radius:var(--radius-sm);background:var(--surface-2);cursor:pointer}
label.check input{width:24px;height:24px;min-height:0;margin:0;accent-color:var(--accent)}
#field-plate:disabled{opacity:.6}
/* Step list with progress */
#step-nav{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin:12px 0 4px;padding:0}
#step-nav .step{display:flex;flex-direction:column;align-items:center;gap:2px;width:100%;min-height:56px;padding:6px 4px;font-size:13px;line-height:1.2;background:var(--surface-2);color:var(--text);border:1px solid var(--line)}
#step-nav .step .num{font-weight:800}
#step-nav .step .state{font-size:12px;color:var(--muted)}
#step-nav .step.todo .state{color:var(--danger)}
#step-nav .step.done .state{color:var(--accent)}
#step-nav .step.current{border-color:var(--accent);box-shadow:inset 0 -3px 0 var(--accent)}
#step-title{outline:none}
/* Photo checklist and slots */
.checklist{list-style:none;display:flex;flex-wrap:wrap;gap:4px 18px;padding:0;margin:8px 0}
.checklist .todo button{color:var(--danger)}
.checklist .done button{color:var(--accent)}
.slots{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin:8px 0 16px}
.slots>h3{grid-column:1/-1;margin:12px 0 0}
.slot{padding:12px;border-radius:var(--radius);background:var(--surface-2);border:2px dashed var(--line-strong);outline:none;min-width:0}
.slot.done{border:2px solid var(--accent)}
.slot:focus{box-shadow:0 0 0 3px var(--focus)}
.slot[aria-invalid=true]{border-color:var(--danger)}
.slot-head{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px}
.badge{font-size:13px;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--danger-soft);color:var(--danger);white-space:nowrap}
.slot.done .badge{background:var(--accent-soft);color:var(--accent-strong)}
.slot>img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:8px}
.placeholder{display:grid;place-items:center;aspect-ratio:4/3;border-radius:8px;background:var(--surface);color:var(--muted);font-size:14px;text-align:center;padding:8px}
.slot-actions{display:flex;flex-wrap:wrap;gap:0 8px}
.slot-actions label.button{flex:1 1 120px;margin-right:0}
#legacy-photos{margin-top:8px;padding:12px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
/* VIN lookup and signature status */
#decode-state[data-kind=error],#signature-state[data-kind=warn]{color:var(--danger)}
#decode-state[data-kind=ok],#signature-state[data-kind=ok]{color:var(--accent-strong)}
#decode-result ul{margin:8px 0;padding-left:20px}
canvas.locked{opacity:.85;border-style:solid;cursor:not-allowed}
.signature-actions{justify-content:flex-start}
.signature-actions #keep-signature{margin-left:auto}
/* Missing items, invalid fields */
#missing:not(:empty){padding:14px 16px;border-radius:var(--radius-sm);margin:12px 0;outline:none}
#missing:has(.todo-title){background:var(--danger-soft);border:1px solid var(--danger)}
#missing:has(.ready){background:var(--accent-soft);border:1px solid var(--accent)}
#missing .todo-title{margin:0 0 4px;font-weight:700;color:var(--danger)}
#missing .ready{margin:0;font-weight:600}
.missing-list{margin:0;padding-left:20px}
[aria-invalid=true]:not(.slot){border-color:var(--danger)!important;box-shadow:0 0 0 2px color-mix(in srgb,var(--danger) 35%,transparent)}
/* Update and install */
.banner{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:12px 16px;margin:0 0 16px;border-radius:var(--radius-sm);background:var(--accent-soft);border:1px solid var(--accent)}
.install{margin:0 0 16px}
.install #install-app{width:100%}
#install-help{margin-top:8px;padding:12px 16px;border-radius:var(--radius-sm);background:var(--surface);border:1px solid var(--line);font-size:15px}
#install-help p{margin:6px 0}
#install-help .warn{color:var(--accent-strong)}

/* Drafts on this device / My submitted intakes / read-only detail */
#history{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
#drafts .draft-item,#history .history-item{display:flex;flex-direction:column;align-items:flex-start;gap:4px;text-align:left}
#history .history-item{width:100%;margin:0;padding:14px 16px;background:var(--surface);color:var(--text);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);font-weight:600;line-height:1.4;overflow-wrap:anywhere}
#history .history-item:hover{border-color:var(--accent);background:var(--surface)}
.draft-item span,.history-item span{font-weight:600}
.draft-item small,.history-item small{font-size:13px;font-weight:500;letter-spacing:0;text-transform:none;opacity:1;color:var(--muted)}
.history-item .received{color:var(--accent-strong)}
.draft-item.problem{border-color:var(--danger)!important}
.draft-item.problem span{color:var(--danger)}
#submitted>.toolbar{margin-bottom:0}#submitted>.toolbar h2{margin:28px 0 0}
#submitted-detail{background:var(--surface);padding:clamp(18px,3vw,32px);border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow);margin-top:20px;scroll-margin-top:90px}
#submitted-detail .toolbar h2{margin:0}
#detail-title{outline:none}
#detail-body dl{padding:16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-2)}
#detail-body .gallery img{aspect-ratio:4/3;object-fit:contain;background:#fff}
.role-nav{display:flex;gap:8px;margin-left:auto}
.role-nav a{display:inline-flex;align-items:center;min-height:var(--tap);padding:0 16px;border-radius:var(--radius-sm);border:1px solid var(--line-strong);background:var(--surface-2);color:var(--text);text-decoration:none;font-weight:600}
.role-nav a:hover{border-color:var(--accent)}

/* Tablet */
@media (min-width:600px) and (max-width:1023px){
  main{max-width:820px}
  .grid{grid-template-columns:repeat(2,1fr)}
}
/* Desktop */
@media (min-width:1024px){
  .grid{grid-template-columns:repeat(3,1fr)}
}
/* Phone */
@media (max-width:599px){
  header{gap:10px}
  header strong{font-size:17px}
  header .brand-logo{width:34px;height:34px}
  header>span{font-size:12px;padding:5px 10px}
  header a{padding:6px 12px;min-height:36px;font-size:13px}
  .grid{grid-template-columns:1fr}
  dl{grid-template-columns:1fr;gap:2px}
  dd{margin-bottom:10px}
  .toolbar button{flex:1 1 auto}
  #drafts{grid-template-columns:1fr}
  #history{grid-template-columns:1fr}
  .role-nav{margin-left:0;width:100%}
  .role-nav a{flex:1 1 0;justify-content:center}
  #step-nav{gap:4px}
  #step-nav .step{min-height:52px;padding:6px 2px;font-size:12px}
  #step-nav .step .name{display:none}
  .slots{grid-template-columns:1fr}
  .plate-row label.check{flex:1 1 100%;justify-content:center}
  #access{margin-top:4px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}