/* The CSP allows no inline styles and no fonts, so we use system fonts and
   inline <svg> icons. The only image is the hero photo.

   Colour always means something: orange is the name and the main button,
   green is progress and success, amber is a public link, red is an error.
   Everything else is ink on paper. */

:root {
  color-scheme: light dark;
  --paper: #f6f5f1;
  --surface: #ffffff;
  --well: #eeede7;
  --ink: #1a1a18;
  --ink-hover: #3a3a36;
  --ink-2: #3f3e3a;
  --muted: #676660;
  --line: #e1dfd7;
  --line-strong: #c4c2b8;
  --on-ink: #f6f5f1;
  --focus: #2d5bd0;
  --public: #8a5200;
  --public-bg: #fbeed5;
  --accent: #c2410c;       /* white on it: 5.2:1 */
  --accent-hover: #a8390a;
  --on-accent: #ffffff;
  --success: #1d6b37;
  --error: #b00020;
  --error-bg: #fbe8ea;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  /* System serifs: Iowan (Apple), Palatino (Windows), P052 (Linux). */
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "P052", "URW Palladio L",
    "Book Antiqua", Charter, "Bitstream Charter", Georgia, serif;
  --t-label: 0.75rem;    /* 12: small caps labels, section numbers */
  --t-small: 0.875rem;   /* 14: hints, step details */
  --t-body: 1rem;
  --t-value: 1.125rem;   /* 18: values, the active step */
  --t-heading: 1.375rem; /* 22: section titles */
  --t-title: 1.75rem;    /* 28: "Uploaded" */
  --radius: 12px;
  --wide: 66rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121211;
    --surface: #1b1b19;
    --well: #1d1d1a;
    --ink: #efeee8;
    --ink-hover: #d6d5ce;
    --ink-2: #cfcec7;
    --muted: #9e9d95;
    --line: #2b2a27;
    --line-strong: #46453f;
    --on-ink: #121211;
    --focus: #8aa9ff;
    --public: #f2b95c;
    --public-bg: #2c2210;
    --accent: #f0864a;     /* #121211 on it: 7.3:1 */
    --accent-hover: #f5a06b;
    --on-accent: #121211;
    --success: #84d4b1;
    --error: #ff8a95;
    --error-bg: #35131a;
  }
}

* { box-sizing: border-box; }

/* The script shows and hides things with `hidden`. Without this, any
   `display` rule below would quietly override it. */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: var(--t-body)/1.55 var(--sans);
  -webkit-text-size-adjust: 100%;
}

.masthead, main { max-width: 38rem; margin: 0 auto; padding: 0 1.25rem; }
.masthead { padding-top: 2.5rem; padding-bottom: 2rem; }
main { padding-bottom: 5rem; }

/* A small, quiet name by default. The upload page enlarges it below. */
h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: var(--t-title);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--accent);
}
.tagline { margin: 0.35rem 0 0; font-size: var(--t-body); color: var(--muted); }
.hero { display: none; }
h2 { font-size: var(--t-heading); line-height: 1.25; font-weight: 650; letter-spacing: -0.015em; margin: 0 0 1.25rem; }
p { margin: 0.6rem 0; }
code { font-family: var(--mono); font-size: 0.92em; }
.hint { font-size: var(--t-small); color: var(--muted); }

.icon { width: 1.25rem; height: 1.25rem; flex: none; }

/* ---- sections: space and a hairline, not boxes ------------------------------- */

.section { padding: 2.25rem 0; border-top: 1px solid var(--line); }
#upload { counter-reset: decide; }
.decide h2 { display: flex; align-items: baseline; gap: 0.75rem; counter-increment: decide; }
.decide h2::before {
  content: counter(decide, decimal-leading-zero);
  font-size: var(--t-label);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.commit { border-top: 0; padding-top: 0.5rem; }

/* ---- controls: every tap target at least 44 px tall -------------------------- */

.field {
  display: block;
  margin: 1.25rem 0 0.45rem;
  font-size: var(--t-label);
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-2);
}

input[type="text"], input[type="password"], select {
  display: block;
  width: 100%;
  min-height: 2.875rem;
  padding: 0.55rem 0.8rem;
  font: inherit; /* 16 px, so phones don't zoom in */
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  transition: border-color 0.15s;
}
input[type="text"]:hover, input[type="password"]:hover:not(:disabled), select:hover { border-color: var(--ink-2); }
input:disabled { opacity: 0.45; cursor: not-allowed; }

/* Our own arrow: the CSP blocks url() icons. */
.select { position: relative; display: block; }
.select select { appearance: none; padding-right: 2.5rem; cursor: pointer; }
.select .chevron { position: absolute; right: 0.8rem; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
select option { color: initial; background: initial; }

button {
  min-height: 2.875rem;
  padding: 0.55rem 1.1rem;
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}
button:hover:not(:disabled) { border-color: var(--ink-2); }
button.primary {
  width: 100%;
  min-height: 3.25rem;
  font-size: var(--t-value);
  color: var(--on-accent);
  background: var(--accent);
  border-color: var(--accent);
  border-radius: var(--radius);
}
button.primary:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
button:disabled { opacity: 0.55; cursor: progress; }
/* The mode wraps whole, never at its hyphen. */
.button-mode { font-weight: 400; white-space: nowrap; }

/* A focus ring that shows on any background. The transparent outline is
   what high-contrast mode draws instead. */
:focus-visible, .drop:has(input:focus-visible) {
  outline: 2px solid transparent;
  outline-offset: 2px;
  box-shadow: 0 0 0 2px var(--paper), 0 0 0 4.5px var(--focus);
}
input:focus-visible, select:focus-visible { border-color: var(--focus); }

.check {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 2.75rem;
  font-weight: 600;
  cursor: pointer;
}
.check input { width: 1.3rem; height: 1.3rem; margin: 0; accent-color: var(--ink); cursor: pointer; }

.pair { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: 1rem; }
.pair .field { margin-top: 0; }

.copy-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.copy-row > input, .copy-row > code { flex: 1 1 14rem; min-width: 0; }
.copy-row > button { flex: 0 0 auto; }
.copy-row > button.primary { width: auto; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---- the drop zone: the first thing anyone sees ------------------------------ */

.drop {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 13rem;
  padding: 1.75rem 1.25rem;
  text-align: center;
  background: var(--well);
  border: 1.5px dashed var(--line-strong);
  border-radius: 16px;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}
.drop:hover { border-color: var(--ink-2); }
.drop-glyph {
  display: grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
  margin-bottom: 0.5rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 50%;
}
.drop-glyph .icon { width: 1.5rem; height: 1.5rem; }
.drop .icon-file { display: none; }
#drop-empty { font-size: var(--t-value); }
#drop-empty strong { text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 0.2em; }
.drop[data-dragging] { border-style: solid; border-color: var(--ink); background: var(--surface); }
.drop[data-chosen="yes"] { min-height: 10rem; border-style: solid; border-color: var(--line-strong); background: var(--surface); }
.drop[data-chosen="yes"] .icon-upload { display: none; }
.drop[data-chosen="yes"] .icon-file { display: block; }
.drop[data-chosen="yes"] .drop-glyph { background: var(--well); }
#drop-chosen { display: flex; flex-direction: column; align-items: center; gap: 0.1rem; max-width: 100%; }
#chosen-name { font-size: var(--t-value); font-weight: 600; overflow-wrap: anywhere; }
#chosen-size { font-variant-numeric: tabular-nums; }

/* ---- which kind of link ------------------------------------------------------ */

.mode {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.8rem 0.95rem;
  border-radius: 10px;
}
.mode .icon { margin-top: 0.12rem; }
.mode-public { background: var(--public-bg); }
.mode-public .icon, .mode-public strong { color: var(--public); }
.mode-restricted { background: var(--well); }
.mode-restricted .icon, .mode-restricted strong { color: var(--ink); }

#passphrase-length { color: var(--ink-2); font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---- status lines ------------------------------------------------------------ */

.status { min-height: 1.5em; margin: 0.9rem 0 0; }
.status:empty { display: none; }
.status[data-state="busy"], .status[data-state="waiting"], .status[data-state="ready"],
.status[data-state="done"], .status[data-state="error"] {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}
.status[data-state="busy"], .status[data-state="waiting"], .status[data-state="ready"],
.status[data-state="done"] { font-weight: 600; }
.status[data-state="busy"] { color: var(--ink-2); font-weight: 400; }
.status[data-state="done"] { color: var(--success); }
/* Markers are pseudo-elements, because the text is set with textContent. */
.status[data-state]::before {
  content: "";
  flex: none;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.1rem;
  border-radius: 50%;
}
.status[data-state=""]::before { display: none; }
.status[data-state="busy"]::before {
  border: 2px solid var(--line-strong);
  border-top-color: var(--success);
  animation: spin 0.8s linear infinite;
}
.status[data-state="waiting"]::before, .status[data-state="ready"]::before { border: 2px solid var(--ink); }
.status[data-state="ready"]::before { background: radial-gradient(circle, var(--ink) 0 35%, transparent 38%); }
.status[data-state="done"]::before {
  width: 0.45rem;
  height: 0.85rem;
  margin: 0.15rem 0.45rem 0 0.4rem;
  border-radius: 0;
  border: solid var(--success);
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}
.status[data-state="error"] {
  padding: 0.75rem 0.9rem;
  color: var(--error);
  background: var(--error-bg);
  border-radius: 10px;
  font-weight: 600;
}
.status[data-state="error"]::before {
  content: "!";
  display: grid;
  place-items: center;
  color: var(--error-bg);
  background: var(--error);
  font-size: 0.8rem;
  font-weight: 800;
  line-height: 1;
}

/* ---- the named waits: the page's centrepiece --------------------------------- */

.steps {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 1.25rem 1.25rem 0.25rem;
  background: var(--well);
  border-radius: 16px;
}
.steps li {
  position: relative;
  display: grid;
  grid-template-columns: 1.75rem 1fr;
  column-gap: 0.9rem;
  padding-bottom: 1.1rem;
}
.steps li > :not(.step-mark) { grid-column: 2; min-width: 0; }
/* The connecting line, only when a visible step follows. */
.steps li:has(~ li:not([hidden]))::before {
  content: "";
  position: absolute;
  left: calc(0.875rem - 1px);
  top: 1.95rem;
  bottom: 0.2rem;
  width: 2px;
  border-radius: 1px;
  background: var(--line-strong);
}
.steps li[data-state="done"]:has(~ li:not([hidden]))::before { background: var(--success); }

.step-mark {
  grid-column: 1;
  grid-row: 1 / span 4;
  align-self: start;
  position: relative;
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border: 2px solid var(--line-strong);
  border-radius: 50%;
  background: var(--paper);
  color: var(--on-ink);
}
.step-mark .icon { display: none; width: 1rem; height: 1rem; }
.steps li[data-state="active"] .step-mark { border-color: var(--success); }
.steps li[data-state="active"] .step-mark::after {
  content: "";
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 1.2s ease-in-out infinite;
}
.steps li[data-state="done"] .step-mark { background: var(--success); border-color: var(--success); }
.steps li[data-state="done"] .icon-done { display: block; }
.steps li[data-state="error"] .step-mark { background: var(--error); border-color: var(--error); color: var(--paper); }
.steps li[data-state="error"] .icon-error { display: block; }

.step-name { align-self: center; min-height: 1.75rem; display: flex; align-items: center; font-weight: 500; color: var(--ink-2); }
.steps li[data-state="pending"] .step-name { color: var(--muted); font-weight: 400; }
.steps li[data-state="active"] .step-name { color: var(--ink); font-weight: 650; font-size: var(--t-value); }

.step-why { display: none; margin: 0.15rem 0 0.4rem; font-size: var(--t-small); color: var(--muted); max-width: 32rem; }
.steps li[data-state="active"] .step-why { display: block; }

.step-detail { font-size: var(--t-small); color: var(--muted); font-variant-numeric: tabular-nums; }
.step-detail:empty { display: none; }
.steps li[data-state="active"] .step-detail { color: var(--ink-2); }
.steps li[data-state="error"] .step-detail { color: var(--error); font-weight: 600; }

/* Only the running step shows a bar. */
.steps li:not([data-state="active"]) progress { display: none; }

progress {
  appearance: none;
  display: block;
  width: 100%;
  height: 0.4rem;
  margin: 0.45rem 0 0.35rem;
  border: 0;
  border-radius: 99px;
  background: var(--line);
  color: var(--success);
  overflow: hidden;
}
progress::-webkit-progress-bar { background: var(--line); border-radius: 99px; }
progress::-webkit-progress-value { background: var(--success); border-radius: 99px; }
progress::-moz-progress-bar { background: var(--success); border-radius: 99px; }

/* No known length: a moving stripe. It only moves while the page is busy. */
progress:indeterminate {
  background: linear-gradient(90deg, var(--line) 0 35%, var(--success) 35% 65%, var(--line) 65%) 0 0 / 300% 100%;
  animation: slide 1.4s linear infinite;
}
progress:indeterminate::-webkit-progress-bar { background: transparent; }
progress:indeterminate::-moz-progress-bar { background: transparent; }

@keyframes pulse { 50% { transform: scale(0.55); opacity: 0.45; } }
@keyframes slide { from { background-position: 100% 0; } to { background-position: 0 0; } }
@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---- result ------------------------------------------------------------------ */

.result h2 { font-size: var(--t-title); }
#link { font-family: var(--mono); font-size: 0.95rem; }
#owner-token {
  display: block;
  padding: 0.65rem 0.8rem;
  font-size: 0.95rem;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  word-break: break-all;
}
/* A heavy border, not a colour: amber already means "public". */
.token-box {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
}
.token-box > p:first-child { margin-top: 0; }

/* ---- download ---------------------------------------------------------------- */

.receive { border-top: 0; padding-top: 0.5rem; }
#unlock { margin-top: 1rem; }
#unlock .field { margin-top: 0; }

/* §8: a file served past its expiry. It should be impossible to miss. */
#expired-warning {
  display: flex;
  gap: 0.7rem;
  margin: 0 0 1.5rem;
  padding: 0.9rem 1rem;
  color: var(--error);
  background: var(--error-bg);
  border: 2px solid var(--error);
  border-radius: var(--radius);
  font-size: var(--t-value);
  font-weight: 700;
  line-height: 1.4;
}
#expired-warning::before {
  content: "!";
  flex: none;
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  margin-top: 0.05rem;
  border-radius: 50%;
  color: var(--error-bg);
  background: var(--error);
  font-size: 0.9rem;
  font-weight: 800;
}

.facts { display: grid; grid-template-columns: max-content 1fr; gap: 0.8rem 1.5rem; margin: 0 0 1.5rem; align-items: baseline; }
.facts dt {
  font-size: var(--t-label);
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
}
.facts dd { margin: 0; min-width: 0; font-size: var(--t-value); font-weight: 500; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
#file-name { font-weight: 650; }
@media (max-width: 26rem) {
  .facts { grid-template-columns: 1fr; gap: 0.1rem; }
  .facts dd { margin-bottom: 0.7rem; }
}

/* ---- the upload page's hero ------------------------------------------------- */

/* Name on the left, photo on the right. Upload page only, so recipients
   never download the photo. */
body:has(> #upload:not([hidden])) .masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(7rem, 34vw, 12rem);
  align-items: center;
  column-gap: 1.25rem;
  padding-top: 2rem;
  padding-bottom: 2.25rem;
}
body:has(> #upload:not([hidden])) .wordmark {
  font-size: clamp(2.5rem, 4vw + 1.5rem, 5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
}
body:has(> #upload:not([hidden])) .tagline {
  margin-top: 0.75rem;
  max-width: 24rem;
  font-size: var(--t-value);
  line-height: 1.45;
}
/* A background, not an <img>: a hidden <img> would still be downloaded. */
body:has(> #upload:not([hidden])) .hero {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  background-color: var(--well);
  background-image: url("/assets/sunbird.jpg");
  background-image: image-set(url("/assets/sunbird.webp") type("image/webp"), url("/assets/sunbird.jpg") type("image/jpeg"));
  background-size: cover;
  background-position: center;
}

/* ---- the upload page on a wide screen ----------------------------------------- */

/* File and token on the left; who can open it, limits and the button on
   the right. Narrower screens get one column in the same order. */
@media (min-width: 60rem) {
  body:has(> #upload:not([hidden])) .masthead,
  #upload { max-width: var(--wide); }
  body:has(> #upload:not([hidden])) .masthead {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 4rem;
    padding-top: 4rem;
    padding-bottom: 4rem;
  }
  body:has(> #upload:not([hidden])) .hero { border-radius: 16px; }
  .columns {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 4rem;
    align-items: start;
  }
  #upload .drop { min-height: 15rem; }
}