@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,600&family=DM+Serif+Display&display=swap');

:root {
  --bg: #f5f2ee;
  --surface: #fff;
  --ink: #1a1715;
  --ink-2: #6b6260;
  --ink-3: #a09895;
  --border: #e8e2dc;
  --accent: #b85636;
  --accent-hover: #9c4429;
  --accent-soft: rgba(184, 86, 54, 0.08);
  --green: #3d7a4a;
  --green-bg: #eaf3ec;
  --red: #a63d2f;
  --red-bg: #f8ebe8;
  --radius: 8px;
  --t: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

/* ---- Upload Page Layout ---- */

.wrapper {
  max-width: 420px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.site-header {
  text-align: center;
  margin-bottom: 28px;
}

.site-header h1 {
  font-family: 'DM Serif Display', Georgia, serif;
  font-size: 1.4rem;
  font-weight: 400;
  margin-bottom: 2px;
}

.site-header .subtitle {
  font-size: 0.8rem;
  color: var(--ink-3);
}

/* Steps */
.how-to {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.how-to-step { text-align: center; }

.how-to-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  margin-bottom: 3px;
}

.how-to-step .step-label {
  display: block;
  font-size: 0.7rem;
  color: var(--ink-3);
}

/* Card */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.03);
}

/* Form */
.form-group { margin-bottom: 16px; }

.form-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

/* Tooltips */
.tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--border);
  color: var(--ink-3);
  font-size: 0.55rem;
  font-weight: 700;
  cursor: help;
  flex-shrink: 0;
}

.tip .tip-t {
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  padding: 6px 10px;
  border-radius: 6px;
  width: 200px;
  line-height: 1.4;
  z-index: 10;
  pointer-events: none;
}

.tip .tip-t::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--ink);
}

.tip:hover .tip-t,
.tip:focus .tip-t { display: block; }

/* Key input */
#keyinput {
  font-family: 'DM Sans', monospace;
  font-size: 1.8rem;
  font-weight: 600;
  width: 160px;
  text-align: center;
  letter-spacing: 0.2em;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--ink);
  text-transform: uppercase;
  transition: border-color var(--t), box-shadow var(--t);
}

#keyinput:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

#keyinput::placeholder { color: var(--ink-3); opacity: 0.4; }

/* File drop */
.file-drop-zone {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--t);
  background: var(--bg);
}

.file-drop-zone:hover,
.file-drop-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.file-drop-zone .drop-icon {
  width: 24px;
  height: 24px;
  margin: 0 auto 4px;
  display: block;
  color: var(--ink-3);
}

.file-drop-zone:hover .drop-icon { color: var(--accent); }

#choosebtn {
  display: inline;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.drop-hint {
  font-size: 0.8rem;
  color: var(--ink-3);
}

#fileinput { display: none; }

#fileinfo {
  font-size: 0.78rem;
  color: var(--ink-2);
  margin-top: 8px;
  font-style: italic;
}
#fileinfo:empty { display: none; }

/* Or divider */
.or-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px 0;
  color: var(--ink-3);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.or-divider::before,
.or-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* URL input */
#urlinput {
  font-family: inherit;
  font-size: 0.85rem;
  width: 100%;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--ink);
  transition: border-color var(--t), box-shadow var(--t);
}
#urlinput:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
#urlinput::placeholder { color: var(--ink-3); opacity: 0.5; }

/* Library select */
#librarySelect {
  font-family: inherit;
  font-size: 0.85rem;
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  transition: border-color var(--t), box-shadow var(--t);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a09895' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}
#librarySelect:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Advanced toggle */
.advanced-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--ink-3);
  cursor: pointer;
  padding: 6px 0;
  margin-bottom: 2px;
  transition: color var(--t);
}
.advanced-toggle:hover { color: var(--ink-2); }

.advanced-toggle .chevron {
  width: 12px;
  height: 12px;
  transition: transform var(--t);
}
.advanced-toggle[aria-expanded="true"] .chevron {
  transform: rotate(90deg);
}

.advanced-options {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.2s ease;
}
.advanced-options.open {
  max-height: 200px;
  opacity: 1;
}

.option-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 6px;
  margin-bottom: 1px;
}
.option-row:hover { background: var(--bg); }

.option-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.option-row label {
  font-size: 0.82rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
}

.badge {
  font-size: 0.58rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--border);
  color: var(--ink-3);
}

/* Submit */
input[type="submit"] {
  display: block;
  width: 100%;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 11px 20px;
  margin-top: 4px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--t);
}
input[type="submit"]:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(184,86,54,0.2);
}
input[type="submit"]:active {
  transform: none;
}

/* Status messages */
#uploadstatus {
  opacity: 0;
  transition: opacity 0.3s ease;
  padding: 10px 14px;
  margin-top: 14px;
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  font-size: 0.82rem;
  line-height: 1.5;
}
#uploadstatus.success {
  background: var(--green-bg);
  border: 1px solid var(--green);
  color: var(--green);
}
#uploadstatus.error {
  background: var(--red-bg);
  border: 1px solid var(--red);
  color: var(--red);
  white-space: pre-wrap;
}

/* Footer */
.site-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 0.7rem;
  color: var(--ink-3);
  line-height: 1.7;
}
.site-footer a {
  color: var(--ink-3);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.site-footer a:hover { color: var(--accent); }

/* ============================================
   DOWNLOAD PAGE (e-ink safe)
   ============================================ */

.center { text-align: center; }

#keyoutput {
  font-size: 3.5em;
  display: inline-block;
  letter-spacing: 0.2em;
  margin: 8px 0;
  font-family: monospace, sans-serif;
  text-transform: uppercase;
  vertical-align: middle;
}

#keygen {
  background: #ddd;
  border: 2px solid #aaa;
  color: black;
  padding: 0.7em;
  display: inline-block;
  font-size: 1em;
  margin-left: 0.5em;
  vertical-align: middle;
  cursor: pointer;
}
#keygen:active { background: black; color: white; }
#keygen svg { display: block; width: 1.3em; height: 1.3em; }

.downloadlink {
  background: #ddd;
  border: 2px solid #aaa;
  color: black;
  padding: 0.5em 1.1em;
  display: inline-block;
  font-size: 1.1em;
  margin: 0.4em;
  text-decoration: none;
  cursor: pointer;
}
.downloadlink:active { background: black; color: white; }

#downloads { display: none; }

hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

.right { text-align: right; }
.aligntop { vertical-align: top; }

#logs { font-size: 0.65rem; color: var(--ink-3); padding: 8px; }

/* ---- Responsive ---- */

@media (max-width: 480px) {
  .wrapper { padding: 20px 16px 36px; }
  .card { padding: 20px 16px; }
  .site-header h1 { font-size: 1.25rem; }
  #keyinput { font-size: 1.6rem; width: 140px; }
  .how-to { gap: 16px; }
  .how-to-step .step-label { font-size: 0.65rem; }
  .tip .tip-t { width: 170px; left: -20px; transform: none; }
  .tip .tip-t::after { left: 26px; transform: none; }
}