/* PDF Handouts — browser build.
   Light and dark are both first-class; the palette is defined once as custom
   properties and flipped by prefers-color-scheme. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --border: #dfe3e8;
  --text: #1c2024;
  --text-dim: #5c6670;
  --accent: #1a4d8f;
  --accent-text: #ffffff;
  --accent-soft: #e8f0fa;
  --danger: #a02020;
  --danger-soft: #fdeded;
  --ok: #1c6b3c;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(0, 0, 0, .05), 0 4px 12px rgba(0, 0, 0, .04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --surface: #1c2024;
    --border: #2e353c;
    --text: #e6e9ec;
    --text-dim: #9aa4ae;
    --accent: #5fa3e8;
    --accent-text: #10161c;
    --accent-soft: #1a2735;
    --danger: #f08a8a;
    --danger-soft: #2a1a1a;
    --ok: #7bc99a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 12px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1rem 4rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .875em;
  background: var(--accent-soft);
  color: var(--text);
  padding: .1em .35em;
  border-radius: 4px;
}

a { color: var(--accent); }

/* ---- masthead ---- */

.masthead {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 0 2rem;
}

.masthead h1 {
  margin: 0 0 .35rem;
  font-size: clamp(1.85rem, 5vw, 2.4rem);
  letter-spacing: -.02em;
}

.tagline {
  margin: 0 0 1.1rem;
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 48ch;
}

.privacy {
  margin: 0;
  padding: .7rem .9rem;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: .9rem;
  color: var(--text);
}

/* ---- panels ---- */

main {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.4rem 1.5rem 1.6rem;
}

.panel h2 {
  margin: 0 0 1.1rem;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: .6rem;
}

.step {
  display: inline-grid;
  place-items: center;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: .82rem;
  font-weight: 600;
  flex: none;
}

/* ---- dropzone ---- */

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}

.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}

.dropzone.dragging {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-icon {
  width: 2rem;
  height: 2rem;
  color: var(--text-dim);
  margin-bottom: .4rem;
}

.drop-title { margin: 0 0 .25rem; font-weight: 600; }
.drop-hint { margin: 0; color: var(--text-dim); font-size: .9rem; }

/* ---- file list ---- */

.file-list-wrap { margin-top: 1.3rem; }

.list-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.list-header h3 { margin: 0; font-size: .95rem; }

.link-button {
  background: none;
  border: none;
  color: var(--accent);
  font: inherit;
  font-size: .85rem;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

.list-hint {
  margin: .15rem 0 .7rem;
  color: var(--text-dim);
  font-size: .82rem;
}

.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.file-item {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .55rem .7rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: grab;
}

.file-item.drag-over { border-color: var(--accent); }
.file-item.dragging { opacity: .4; }

.grip {
  color: var(--text-dim);
  flex: none;
  font-size: 1.1rem;
  line-height: 1;
  cursor: grab;
}

.file-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: .9rem;
}

.badge {
  flex: none;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .04em;
  padding: .16rem .45rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
}

.badge.bad { background: var(--danger-soft); color: var(--danger); }

.remove {
  flex: none;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 .2rem;
  border-radius: 4px;
}

.remove:hover { color: var(--danger); }

/* ---- form ---- */

.field { margin-bottom: 1.05rem; }
.field:last-child { margin-bottom: 0; }

.field label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: .3rem;
}

.field input[type="text"],
.field select {
  width: 100%;
  padding: .5rem .6rem;
  font: inherit;
  font-size: .92rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
}

.field input:focus,
.field select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}

.field-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1rem;
}

.help {
  margin: .3rem 0 0;
  font-size: .8rem;
  color: var(--text-dim);
}

.placeholders { margin-top: 1rem; }

.advanced {
  margin-top: 1.3rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.advanced summary {
  cursor: pointer;
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: .9rem;
}

/* ---- build ---- */

.build-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.primary {
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  border-radius: 8px;
  padding: .65rem 1.4rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.primary:disabled { opacity: .45; cursor: not-allowed; }
.primary:not(:disabled):hover { filter: brightness(1.08); }

.status { color: var(--text-dim); font-size: .88rem; }

.result { margin-top: 1.2rem; }

.download {
  display: inline-block;
  padding: .6rem 1.2rem;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.result-summary {
  margin: .8rem 0 0;
  font-size: .9rem;
  color: var(--ok);
  font-weight: 600;
}

.notes {
  margin: .5rem 0 0;
  padding-left: 1.1rem;
  font-size: .85rem;
  color: var(--text-dim);
}

.error {
  margin-top: 1.1rem;
  padding: .8rem 1rem;
  background: var(--danger-soft);
  border-left: 3px solid var(--danger);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--danger);
  font-size: .9rem;
  white-space: pre-wrap;
}

/* ---- colophon ---- */

.colophon {
  max-width: 760px;
  margin: 2.5rem auto 0;
  color: var(--text-dim);
  font-size: .85rem;
  text-align: center;
}

/* ---- verification section ---- */

.verify p { max-width: 62ch; }

.verify > p:first-of-type {
  color: var(--text-dim);
  margin-top: 0;
}

.checks {
  margin: 1.4rem 0 0;
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.checks li::marker {
  color: var(--accent);
  font-weight: 700;
}

.checks h3 {
  margin: 0 0 .35rem;
  font-size: .95rem;
}

.checks p {
  margin: 0 0 .5rem;
  font-size: .9rem;
}

.verify pre {
  margin: .6rem 0;
  padding: .8rem .9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
  font-size: .8rem;
  line-height: 1.5;
}

.verify pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.aside {
  font-size: .82rem;
  color: var(--text-dim);
}

.verify > .aside:last-child {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}