/* MediaZip design system: tokens + components. No framework, no external fonts; CSP style-src 'self'
   (no inline styles anywhere). Icons: /static/icons.svg sprite, <svg class="icon"><use href="…#i-x"/></svg>. */

/* ---- 1. Tokens ------------------------------------------------------------------ */
:root {
  color-scheme: light dark;

  /* colour (light); every text pair is >= 4.5:1, every UI boundary >= 3:1 */
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef0f3;      /* tile placeholder, hover fill, neutral badge */
  --fg: #16181d;
  --muted: #596170;
  --border: #dde1e7;         /* decorative separators only */
  --border-strong: #838a95;  /* interactive boundaries */
  --accent: #4752c4;
  --accent-hover: #3c45a5;
  --accent-fg: #ffffff;
  --link: #4752c4;
  --focus: #4752c4;
  --progress-fill: #4752c4;
  --progress-track: #dde1e7; /* not --border: that one darkens under prefers-contrast */
  --danger-bg: #fdecec;
  --danger-fg: #8a1c1c;
  --danger-border: #c43c3c;
  --success-bg: #e6f4ec;
  --success-fg: #1a7340;
  --disabled-bg: #e4e7eb;
  --disabled-fg: #6b7280;
  --overlay: rgb(0 0 0 / 0.72);
  --overlay-fg: #ffffff;
  --shadow-sm: 0 1px 2px rgb(16 18 23 / 0.06);
  --shadow-md: 0 2px 8px rgb(16 18 23 / 0.08), 0 1px 2px rgb(16 18 23 / 0.06);
  --focus-width: 2px;

  /* spacing: 4px base */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;

  /* radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 999px;

  /* type: system stack, ~1.25 ratio, rem so user zoom works */
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
  --text-xs: 0.75rem;    /* 12 badges */
  --text-sm: 0.875rem;   /* 14 meta, captions, footer */
  --text-md: 1rem;       /* 16 body, buttons */
  --text-lg: 1.25rem;    /* 20 h2, lead */
  --text-xl: 1.5rem;     /* 24 page h1 */
  --text-2xl: 2rem;      /* 32 landing hero */
  --leading-tight: 1.25;
  --leading: 1.5;

  /* sizes */
  --control-sm: 36px;
  --control-md: 44px;
  --control-lg: 52px;
  --icon-sm: 16px;
  --icon-md: 20px;
  --icon-lg: 40px;
  --content: 960px;
  --prose: 68ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1e1f22;
    --surface: #2b2d31;
    --surface-2: #35373c;
    --fg: #eceef1;
    --muted: #a3a9b3;
    --border: #3a3d44;
    --border-strong: #7a7f89;
    --accent: #5865f2;
    --accent-hover: #4752c4;
    --link: #a5acff;
    --focus: #a5acff;
    --progress-fill: #a5acff;
    --progress-track: #3a3d44;
    --danger-bg: #3b1f22;
    --danger-fg: #ffb4b4;
    --danger-border: #f07878;
    --success-bg: #173326;
    --success-fg: #7ad6a0;
    --disabled-bg: #303237;
    --disabled-fg: #8b919b;
    --shadow-sm: none;
    --shadow-md: 0 2px 10px rgb(0 0 0 / 0.35);
  }
}

/* more contrast: darker secondary text, all borders strong, thicker focus ring */
@media (prefers-contrast: more) {
  :root {
    --muted: #3f4550;
    --border: #838a95;
    --border-strong: #4b515b;
    --disabled-fg: #4b515b;
    --focus-width: 3px;
  }
}
@media (prefers-contrast: more) and (prefers-color-scheme: dark) {
  :root {
    --muted: #cdd1d8;
    --border: #7a7f89;
    --border-strong: #b4b9c2;
    --disabled-fg: #b4b9c2;
  }
}

/* ---- 2. Base -------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; } /* components set display; hidden must still win */
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: var(--text-md) / var(--leading) var(--font);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
main { max-width: var(--content); margin: 0 auto; padding: var(--space-5) var(--space-4) var(--space-7); }
h1, h2, h3 { line-height: var(--leading-tight); margin: 0 0 var(--space-3); }
h1 { font-size: var(--text-xl); font-weight: 700; }
h2 { font-size: var(--text-lg); font-weight: 650; }
h3 { font-size: var(--text-md); font-weight: 650; }
p, ul, ol { margin: 0 0 var(--space-4); }
a { color: var(--link); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: var(--focus-width) solid var(--focus); outline-offset: 2px; border-radius: var(--radius-sm); }
code { font-family: var(--font-mono); font-size: 0.9em; }
img, svg { max-width: 100%; }

/* utilities */
.muted { color: var(--muted); }
.small { font-size: var(--text-sm); }
.num { font-variant-numeric: tabular-nums; }
.stack > * { margin-top: 0; margin-bottom: 0; }
.stack > * + * { margin-top: var(--space-4); }
.stack-sm > * { margin-top: 0; margin-bottom: 0; }
.stack-sm > * + * { margin-top: var(--space-2); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* ---- 3. Page layout: site header, page header, prose (legal pages), footer ----- */
/* the brand bar above <main>: icon + wordmark, a link home; aligned with main's content column */
body > .site-header {
  margin: 0 max(var(--space-4), (100% - var(--content)) / 2 + var(--space-4));
  padding-top: var(--space-4);
}
.brand {
  display: inline-flex; align-items: center; gap: var(--space-2);
  color: var(--fg); font-weight: 700; text-decoration: none;
}
.brand:hover { text-decoration: underline; }
/* the icon keeps its own dark square and lime badge (an image, not themed) */
.brand__icon { width: 28px; height: 28px; flex: none; border-radius: 22%; }
.page-header { margin-bottom: var(--space-5); }
.page-header > * { margin: 0; }
.page-header > * + * { margin-top: var(--space-1); }
.page-header .muted { font-size: var(--text-sm); font-variant-numeric: tabular-nums; }
/* keep running text to a readable measure on wide screens (the /d summary and hints) */
.page-header > p, .stack-sm > p.small { max-width: var(--prose); }

.prose { max-width: var(--prose); }
.prose h2 { margin-top: var(--space-6); }
.prose h3 { margin-top: var(--space-5); }
.prose ul, .prose ol { padding-left: 1.5em; }
.prose li + li { margin-top: var(--space-2); }
.prose li::marker { color: var(--muted); }

.site-footer {
  margin-top: var(--space-7); padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  font-size: var(--text-sm); color: var(--muted);
}
.site-footer p { margin: 0; }
.site-footer a { color: inherit; }
.site-footer a:hover { color: var(--fg); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-4); }
.site-footer > * + * { margin-top: var(--space-2); }
/* outside <main> (its own contentinfo landmark), aligned with main's content column */
body > .site-footer {
  margin: 0 max(var(--space-4), (100% - var(--content)) / 2 + var(--space-4)) var(--space-7);
}
/* touch screens: the brand link and the footer links (stand-alone, not inline in a sentence)
   get a 44px-tall tap area; with a mouse they keep their text height */
@media (pointer: coarse) {
  .brand, .site-footer nav a { min-height: var(--control-md); display: inline-flex; align-items: center; }
  .site-footer nav { gap: 0 var(--space-5); }
  body > .site-footer { padding-top: var(--space-2); }
}

/* ---- 4. Icon -------------------------------------------------------------------- */
.icon { width: var(--icon-md); height: var(--icon-md); flex: none; display: inline-block; vertical-align: middle; }
.icon--sm { width: var(--icon-sm); height: var(--icon-sm); }
.icon--lg { width: var(--icon-lg); height: var(--icon-lg); stroke-width: 1.5; }

/* ---- 5. Button + action set ----------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: var(--control-md);
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent; color: inherit;
  font: inherit; font-weight: 600; line-height: 1.2;
  text-decoration: none; white-space: nowrap;
  cursor: pointer;
  transition: background-color 120ms, border-color 120ms, color 120ms;
}
.btn:focus-visible { border-radius: var(--radius-md); }
.btn:active:not(:disabled) { transform: translateY(1px); }

.btn--primary { background: var(--accent); color: var(--accent-fg); box-shadow: var(--shadow-sm); }
.btn--primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn--secondary { background: var(--surface); color: var(--fg); border-color: var(--border-strong); }
.btn--secondary:hover:not(:disabled) { background: var(--surface-2); }
.btn--ghost { color: var(--link); }
.btn--ghost:hover:not(:disabled) { background: var(--surface-2); }

.btn--sm { min-height: var(--control-sm); padding: 0 var(--space-3); font-size: var(--text-sm); }
.btn--lg { min-height: var(--control-lg); padding: 0 var(--space-5); }
.btn--block { width: 100%; }
@media (pointer: coarse) { .btn--sm { min-height: var(--control-md); } } /* keep 44px touch targets */

.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--disabled-bg); color: var(--disabled-fg); border-color: transparent;
  box-shadow: none; cursor: not-allowed;
}
.btn--ghost:disabled, .btn--ghost[aria-disabled="true"] { background: transparent; }

/* busy: keeps its colour, a spinner replaces the icon */
.btn[aria-busy="true"] { cursor: progress; }
.btn[aria-busy="true"] .icon { display: none; }
.btn[aria-busy="true"]::before {
  content: ""; width: var(--icon-sm); height: var(--icon-sm); flex: none;
  border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.actions { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
@media (max-width: 480px) { .actions > .btn { flex: 1 1 100%; } }

/* ---- 6. Card -------------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.card > :last-child { margin-bottom: 0; }
.card--flat { box-shadow: none; }

/* ---- 7. Badge ------------------------------------------------------------------- */
.badge {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--surface-2); color: var(--muted);
  font-size: var(--text-xs); font-weight: 600; line-height: 1.4;
  font-variant-numeric: tabular-nums; white-space: nowrap;
}
.badge .icon { width: 12px; height: 12px; }
.badge--overlay { background: var(--overlay); color: var(--overlay-fg); }
.badge--success { background: var(--success-bg); color: var(--success-fg); }
.badge--danger { background: var(--danger-bg); color: var(--danger-fg); }

/* ---- 8. Alert ------------------------------------------------------------------- */
.alert {
  display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-1) var(--space-3);
  margin: var(--space-4) 0;
  padding: var(--space-3) var(--space-4);
  border: 1px solid; border-radius: var(--radius-md);
}
.alert:has(> .icon) { grid-template-columns: auto minmax(0, 1fr); } /* icon column is optional */
.alert > * { margin: 0; }
.alert > .icon { grid-row: 1 / span 2; margin-top: 2px; }
.alert > .icon ~ * { grid-column: 2; }
.alert__title { font-size: var(--text-md); font-weight: 650; line-height: var(--leading); }
.alert__body { font-size: var(--text-sm); }
.alert__actions { margin-top: var(--space-2); }
.alert--danger { background: var(--danger-bg); color: var(--danger-fg); border-color: var(--danger-border); }
.alert--success { background: var(--success-bg); color: var(--success-fg); border-color: transparent; }
.alert--info { background: var(--surface); color: var(--fg); border-color: var(--border); }
.alert--info > .icon { color: var(--link); }
.alert a { color: inherit; }

/* ---- 9. Progress ---------------------------------------------------------------- */
.progress { display: grid; gap: var(--space-2); margin: var(--space-4) 0; }
.progress > p { margin: 0; }
.progress__label { display: flex; justify-content: space-between; gap: var(--space-3); font-size: var(--text-sm); }
.progress__label b { font-weight: 600; }
.progress__label span { color: var(--muted); font-variant-numeric: tabular-nums; }
.progress progress {
  -webkit-appearance: none; appearance: none;
  display: block; width: 100%; height: 8px;
  border: 0; border-radius: var(--radius-full);
  background: var(--progress-track); color: var(--progress-fill); overflow: hidden;
}
.progress progress::-webkit-progress-bar { background: var(--progress-track); border-radius: var(--radius-full); }
.progress progress::-webkit-progress-value { background: var(--progress-fill); border-radius: var(--radius-full); transition: width 200ms; }
.progress progress::-moz-progress-bar { background: var(--progress-fill); border-radius: var(--radius-full); }

/* ---- 10. File grid + tile ------------------------------------------------------- */
.grid {
  list-style: none; margin: var(--space-4) 0; padding: 0;
  display: grid; gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
}
@media (max-width: 380px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-2); } }

.tile {
  position: relative;
  display: flex; flex-direction: column; min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.tile:hover { border-color: var(--border-strong); }
.tile:focus-within { outline: var(--focus-width) solid var(--focus); outline-offset: 2px; }
.tile__media {
  position: relative; aspect-ratio: 1; overflow: hidden; /* keeps portrait images square */
  background: var(--surface-2);
  display: grid; place-items: center;
}
.tile__media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
/* non-media: 40px type icon + extension label (e.g. PDF, ZIP) */
.tile__type { display: grid; justify-items: center; gap: var(--space-2); color: var(--muted); }
.tile__ext { font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.tile__corner { position: absolute; right: var(--space-2); bottom: var(--space-2); }
.tile__status { position: absolute; top: var(--space-2); left: var(--space-2); }
.tile__body { padding: var(--space-2) var(--space-3) var(--space-3); display: grid; gap: 2px; min-width: 0; }
.tile__name {
  font-size: var(--text-sm); font-weight: 600; line-height: 1.3; color: var(--fg); text-decoration: none;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; line-clamp: 2;
  overflow: hidden; overflow-wrap: anywhere;
}
/* the whole tile is the link's hit area; the focus ring is drawn on the tile */
.tile__name::after { content: ""; position: absolute; inset: 0; }
.tile__name:focus-visible { outline: none; }
.tile__name:hover { text-decoration: underline; }
.tile__meta { font-size: var(--text-xs); color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tile.is-failed { border-color: var(--danger-border); }
.tile.is-failed .tile__media img, .tile.is-failed .tile__type { opacity: 0.45; }

/* ---- 11. Skeleton --------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, var(--surface-2) 0%, var(--border) 50%, var(--surface-2) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  border-radius: var(--radius-sm);
}
.skeleton--line { height: 0.75em; margin: var(--space-1) 0; }
.skeleton--short { width: 55%; }
.tile--skeleton .tile__media.skeleton { border-radius: 0; }
@keyframes shimmer { from { background-position: 100% 0; } to { background-position: -100% 0; } }

/* ---- 12. Note (lock icon + muted privacy line) ---------------------------------- */
.note { display: flex; gap: var(--space-3); align-items: flex-start; font-size: var(--text-sm); color: var(--muted); }
.note > .icon { margin-top: 1px; }
.note p { margin: 0; }

/* ---- 13. Motion ----------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .btn:active:not(:disabled) { transform: none; }
}

/* ---- 14. Download page ---------------------------------------------------------- */
/* expired link: the grid stays visible for reference but is inert, so it reads as unavailable */
.grid[inert] .tile { opacity: 0.6; }