/* postage printer — utility-modern, monospace-flavoured
   ------------------------------------------------------ */

:root {
  --paper:        oklch(0.975 0.008 85);
  --paper-2:      oklch(0.955 0.010 85);
  --ink:          oklch(0.18 0.01 80);
  --ink-2:        oklch(0.38 0.01 80);
  --ink-3:        oklch(0.58 0.01 80);
  --rule:         oklch(0.88 0.008 80);
  --rule-2:       oklch(0.82 0.010 80);
  --accent:       oklch(0.70 0.15 65);   /* amber/coral */
  --accent-ink:   oklch(0.25 0.10 65);
  --bad:          oklch(0.58 0.16 28);
  --sans:  'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--mono); font-size: 0.92em; }
.mute { color: var(--ink-3); }

/* ── masthead ───────────────────────────────────────────────── */
.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}
.masthead__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.mark { display: flex; align-items: center; gap: 12px; }
.mark__stamp {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--accent);
  letter-spacing: -2px;
}
.mark__name {
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 15px;
}
.masthead__meta { display: flex; align-items: center; gap: 10px; }
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px 4px 4px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
}
.pill__k {
  background: var(--ink);
  color: var(--paper);
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.pill__v { color: var(--ink-2); }
.pill__arrow { color: var(--ink-3); font-family: var(--mono); }

/* ── shell ──────────────────────────────────────────────────── */
.shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 28px 96px;
  display: flex;
  flex-direction: column;
  gap: 72px;
}

/* ── step pattern ───────────────────────────────────────────── */
.step__head {
  display: grid;
  grid-template-columns: 56px 1fr;
  column-gap: 20px;
  align-items: baseline;
  margin-bottom: 24px;
}
.step__num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  grid-row: 1 / span 2;
  padding-top: 4px;
  border-top: 2px solid var(--ink);
}
.step__title {
  margin: 0;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.step__hint {
  margin: 8px 0 0;
  color: var(--ink-2);
  grid-column: 2;
  max-width: 62ch;
}

/* ── dropzone ───────────────────────────────────────────────── */
.dropzone {
  border: 1px solid var(--rule-2);
  background: var(--paper-2);
  border-radius: 4px;
  overflow: hidden;
  transition: border-color .15s, background .15s;
}
.dropzone.is-hover {
  border-color: var(--accent);
  background: color-mix(in oklch, var(--accent) 6%, var(--paper));
}

.dropzone__body {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 40px 36px;
  border-bottom: 1px dashed var(--rule);
}
.dropzone__glyph { color: var(--ink-2); flex-shrink: 0; }
.dropzone__copy { flex: 1; }
.dropzone__lede {
  margin: 0;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.015em;
}
.dropzone__sub {
  margin: 6px 0 0;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 12px;
}
.linkbtn {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent-ink);
  font: inherit;
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  cursor: pointer;
}
.linkbtn:hover { color: var(--accent); }

/* filelist */
.filelist {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--paper);
  border-bottom: 1px dashed var(--rule);
}
.filelist li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 36px;
  font-family: var(--mono);
  font-size: 13px;
  border-bottom: 1px solid var(--rule);
}
.filelist li:last-child { border-bottom: none; }
.filelist .fname { color: var(--ink); }
.filelist .fsize { color: var(--ink-3); }
.filelist .fx {
  background: none;
  border: none;
  color: var(--ink-3);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 14px;
  padding: 2px 6px;
}
.filelist .fx:hover { color: var(--bad); }

/* foot of dropzone */
.dropzone__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px 18px 36px;
  background: var(--paper);
  flex-wrap: wrap;
}
.opts { display: flex; gap: 18px; flex-wrap: wrap; }
.opt {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.opt__k {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}
.opt select {
  font: inherit;
  font-family: var(--mono);
  font-size: 13px;
  padding: 6px 28px 6px 10px;
  background:
    var(--paper)
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' stroke='%23666' stroke-width='1.3' fill='none'/></svg>")
    no-repeat right 10px center;
  border: 1px solid var(--rule-2);
  border-radius: 3px;
  color: var(--ink);
  appearance: none;
  cursor: pointer;
}
.opt select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ── buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  font: inherit;
  font-weight: 500;
  font-size: 14px;
  border: 1px solid var(--rule-2);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  transition: transform .08s, background .15s, border-color .15s;
}
.btn:hover { background: var(--paper-2); border-color: var(--ink-3); }
.btn:active { transform: translateY(1px); }
.btn:disabled {
  opacity: .4;
  cursor: not-allowed;
  transform: none;
}
.btn--primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn--primary:hover:not(:disabled) {
  background: var(--accent-ink);
  border-color: var(--accent-ink);
}
.btn__arrow { font-family: var(--mono); opacity: .7; }

/* ── preview grid ──────────────────────────────────────────── */
.step--muted { opacity: 1; }
.preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 20px;
}
.thumb {
  border: 1px solid var(--rule-2);
  background: var(--paper);
  border-radius: 3px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: border-color .15s, transform .08s;
  position: relative;
}
.thumb:hover { border-color: var(--ink-3); }
.thumb[data-selected="false"] {
  opacity: 0.35;
  background: var(--paper-2);
}
.thumb__paper {
  /* 4:6 aspect for thermal label preview */
  aspect-ratio: 4 / 6;
  background: #fff
    repeating-linear-gradient(
      135deg,
      transparent 0 14px,
      color-mix(in oklch, var(--ink) 4%, transparent) 14px 15px
    );
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.thumb__paper::after {
  /* fake address-label look */
  content: '';
  position: absolute;
  inset: 10% 14% 52% 14%;
  background:
    linear-gradient(var(--ink-2) 0 3px, transparent 3px) 0 0/100% 8px,
    linear-gradient(var(--ink-2) 0 3px, transparent 3px) 0 14px/70% 8px,
    linear-gradient(var(--ink-2) 0 3px, transparent 3px) 0 28px/85% 8px;
  background-repeat: no-repeat;
  opacity: 0.5;
}
.thumb__meta {
  display: flex;
  justify-content: space-between;
  padding: 8px 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
}
.thumb__num { color: var(--ink); }
.thumb__side {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}
.thumb__check {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--ink-2);
  border-radius: 2px;
  background: var(--paper);
}
.thumb[data-selected="true"] .thumb__check {
  background: var(--ink);
  border-color: var(--ink);
}
.thumb[data-selected="true"] .thumb__check::after {
  content: '';
  position: absolute;
  inset: 3px 4px 5px 3px;
  border-bottom: 2px solid var(--paper);
  border-right: 2px solid var(--paper);
  transform: rotate(40deg) translate(-1px, -2px);
}
.preview__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  gap: 16px;
  flex-wrap: wrap;
}
.preview__actions {
  display: flex;
  gap: 10px;
}

/* ── how it works ──────────────────────────────────────────── */
.how__title,
.setup__title {
  font-size: 14px;
  font-family: var(--mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  margin: 0 0 28px;
}
.how__steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 40px;
}
.how__steps li {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
}
.how__num {
  font-family: var(--mono);
  font-size: 20px;
  color: var(--accent);
  font-weight: 600;
  line-height: 1;
  padding-top: 2px;
}
.how__steps h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.how__steps p {
  margin: 0;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.55;
}

/* ── setup ─────────────────────────────────────────────────── */
.setup__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.setup__card {
  border: 1px solid var(--rule-2);
  border-radius: 3px;
  padding: 18px 20px 20px;
  background: var(--paper-2);
}
.setup__card header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 14px;
}
.setup__os {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.code {
  margin: 0 0 14px;
  padding: 14px 16px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.65;
  overflow-x: auto;
  white-space: pre;
}
.setup__card p {
  margin: 0;
  font-size: 13px;
  color: var(--ink-2);
}
.setup__note {
  margin: 24px 0 0;
  padding-top: 20px;
  border-top: 1px dashed var(--rule);
  font-size: 13px;
  color: var(--ink-2);
  max-width: 76ch;
}

/* ── footer ────────────────────────────────────────────────── */
.foot {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 28px 48px;
  border-top: 1px solid var(--rule);
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
}

/* ── responsive ────────────────────────────────────────────── */
@media (max-width: 720px) {
  .masthead__inner { flex-wrap: wrap; }
  .shell { padding: 32px 20px 64px; gap: 56px; }
  .step__head { grid-template-columns: 40px 1fr; column-gap: 14px; }
  .step__title { font-size: 26px; }
  .dropzone__body { flex-direction: column; align-items: flex-start; padding: 28px 22px; }
  .dropzone__foot { padding: 16px 22px; }
  .how__steps,
  .setup__grid { grid-template-columns: 1fr; }
}