/* S3 File Browser — Vehlo-branded styles. No framework. */

/* --- Vehlo Brand Tokens --- */
:root {
  /* Vehlo palette */
  --vehlo-gold:        #FAC300;
  --vehlo-orange:      #FF7F09;
  --vehlo-blood-orange:#F24C18;
  --vehlo-pale-blue:   #C1DAFF;
  --vehlo-green:       #00BF6C;
  --vehlo-blue:        #006BFF;

  /* Neutrals */
  --vehlo-black:       #000000;
  --vehlo-dark:        #111111;
  --vehlo-gray-mid:    #D7DADE;
  --vehlo-gray-pale:   #EFEFEF;
  --vehlo-white:       #FFFFFF;

  /* Light-mode semantic tokens */
  --bg:               var(--vehlo-white);
  --bg-subtle:        var(--vehlo-gray-pale);
  --fg:               var(--vehlo-black);
  --muted:            #555557;
  --border:           var(--vehlo-gray-mid);
  --header-bg:        var(--vehlo-black);
  --header-fg:        var(--vehlo-white);
  --header-accent:    var(--vehlo-gold);
  --accent:           var(--vehlo-blue);
  --accent-fg:        var(--vehlo-white);
  --row-hover:        #FFF9E6;       /* very light gold tint */
  --row-focus:        #FFF0B3;       /* gold tint, more saturated */
  --error-bg:         #FEF0EE;
  --error-fg:         #A82010;       /* darkened blood-orange for WCAG AA */
  --error-border:     var(--vehlo-blood-orange);
  --breadcrumb-link:  var(--vehlo-blue);
  --spinner-track:    var(--vehlo-gray-mid);
  --spinner-head:     var(--vehlo-gold);
  --table-head-fg:    #444446;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:              #111111;
    --bg-subtle:       #1C1C1E;
    --fg:              #F2F2F7;
    --muted:           #98989F;
    --border:          #2C2C2E;
    --header-bg:       #000000;
    --header-fg:       var(--vehlo-white);
    --header-accent:   var(--vehlo-gold);
    --accent:          #4A9FFF;      /* lightened blue for dark bg */
    --accent-fg:       #000000;
    --row-hover:       #1E1A00;      /* dark gold tint */
    --row-focus:       #2E2800;
    --error-bg:        #2A0E0A;
    --error-fg:        #FF9585;      /* lightened blood-orange for dark */
    --error-border:    var(--vehlo-blood-orange);
    --breadcrumb-link: #4A9FFF;
    --spinner-track:   #2C2C2E;
    --spinner-head:    var(--vehlo-gold);
    --table-head-fg:   var(--muted);
  }
}

/* --- Reset --- */
* { box-sizing: border-box; }

/* The hidden attribute must win over layout display rules (flex, etc.).
   Without this, #loading-spinner { display: flex } overrides hidden's
   built-in display:none, leaving the spinner visible even when hidden. */
[hidden] { display: none !important; }

/* --- Base --- */
body {
  margin: 0;
  /* Arial (brand paragraph/body font); -apple-system etc. as fallbacks */
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 2;           /* brand: double-spaced paragraphs */
  font-size: 0.9375rem;     /* 15px — readable without being large */
}

/* --- Header --- */
#app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 3.5rem;
  background: var(--header-bg);
  border-bottom: 3px solid var(--vehlo-gold); /* gold accent stripe */
}

/* Wordmark — "VEHLO" in Impact, all-caps, gold */
#app-header h1 {
  margin: 0;
  font-family: Impact, "Arial Narrow", Arial, sans-serif;
  font-size: 1.5rem;
  font-weight: 400;        /* Impact is inherently heavy */
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--header-accent);
  line-height: 1;
}

/* Subtitle / page label beside the wordmark */
#app-header h1 span.page-label {
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--vehlo-gray-mid);
  margin-left: 0.75rem;
  vertical-align: middle;
  opacity: 0.85;
}

#user-info {
  color: var(--vehlo-gray-mid);
  font-size: 0.8125rem;
  font-family: Arial, sans-serif;
  letter-spacing: 0.02em;
}

/* --- Breadcrumb --- */
#breadcrumb-nav {
  padding: 0.625rem 2rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
}

#breadcrumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  line-height: 1.4;
}

#breadcrumb-list li { display: flex; align-items: center; }

#breadcrumb-list li + li::before {
  content: "/";
  margin: 0 0.4rem;
  color: var(--border);
  font-weight: 700;
}

#breadcrumb-list button {
  background: none;
  border: none;
  color: var(--breadcrumb-link);
  cursor: pointer;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  transition: background 0.12s, color 0.12s;
}

#breadcrumb-list button:hover {
  background: var(--row-hover);
  color: var(--vehlo-orange);
}

#breadcrumb-list button:focus-visible {
  outline: 2px solid var(--vehlo-gold);
  outline-offset: 2px;
  background: var(--row-focus);
}

#breadcrumb-list [aria-current="page"] {
  color: var(--muted);
  font-weight: 700;
  cursor: default;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.8125rem;
}

/* --- Main region --- */
#file-list-region {
  padding: 1.25rem 2rem 2rem;
}

/* --- Loading spinner --- */
#loading-spinner {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--muted);
  padding: 1.5rem 0;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
}

.spinner {
  width: 1.125rem;
  height: 1.125rem;
  border: 2.5px solid var(--spinner-track);
  border-top-color: var(--spinner-head);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* --- Error banner --- */
#error-banner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  background: var(--error-bg);
  color: var(--error-fg);
  border-radius: 4px;
  border-left: 4px solid var(--error-border);
  font-size: 0.875rem;
  line-height: 1.5;
}

#error-banner button {
  margin-left: auto;
  padding: 0.3rem 0.875rem;
  background: var(--vehlo-orange);
  color: #000;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  font-family: Arial, sans-serif;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background 0.12s;
  white-space: nowrap;
}

#error-banner button:hover { background: var(--vehlo-gold); }
#error-banner button:focus-visible {
  outline: 2px solid var(--vehlo-gold);
  outline-offset: 2px;
}

/* --- File table --- */
#file-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: 4px;
  overflow: hidden;
}

#file-table th {
  text-align: left;
  padding: 0.5rem 0.875rem;
  border-bottom: 2px solid var(--vehlo-gold); /* gold underline on header row */
  background: var(--bg-subtle);
  font-family: Arial, sans-serif;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--table-head-fg);
  line-height: 1.4;
}

#file-table td {
  text-align: left;
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  line-height: 1.4;
  vertical-align: middle;
}

#file-table tbody tr {
  cursor: pointer;
  transition: background 0.1s;
}

#file-table tbody tr:last-child td { border-bottom: none; }

#file-table tbody tr:hover { background: var(--row-hover); }

#file-table tbody tr:focus {
  background: var(--row-focus);
  outline: 2px solid var(--vehlo-gold);
  outline-offset: -2px;
}

/* File-name column — slightly heavier weight for scannability */
#file-table td:first-child {
  font-weight: 600;
  color: var(--fg);
}

/* Size + date — muted */
#file-table td:not(:first-child) {
  color: var(--muted);
  font-size: 0.8125rem;
}

.row-icon {
  margin-right: 0.5rem;
  font-size: 1em;
  vertical-align: -0.1em;
}

/* --- Empty state --- */
#empty-state {
  color: var(--muted);
  padding: 3rem 0;
  text-align: center;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  line-height: 1.6;
}

/* --- Footer --- */
footer {
  padding: 1rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8125rem;
  margin-top: 2rem;
  line-height: 1.6;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  #app-header,
  #breadcrumb-nav,
  #file-list-region,
  footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  #app-header { height: auto; padding-top: 0.75rem; padding-bottom: 0.75rem; }

  #file-table th:nth-child(2),
  #file-table td:nth-child(2) { display: none; }   /* hide Size on mobile */
}