:root {
  --bg: #04120C;
  --bg-lift: rgba(255,255,255,0.045);
  --line: rgba(255,255,255,0.10);
  --ink: #EAF4EE;
  --dim: rgba(234,244,238,0.60);
  --green: #25D366;
  --coral: #FF7A6B;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100dvh;
  padding: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1100px 620px at 82% -8%, rgba(37,211,102,0.20), transparent 62%),
    linear-gradient(168deg, #0B2B1E 0%, var(--bg) 58%);
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
}

#app {
  flex: 1;
  width: 100%;
  max-width: 620px;
  margin: 0 auto;
  padding: 56px 20px 32px;
}

.stage[hidden] { display: none !important; }

/* ---------- intro ---------- */
.kicker {
  margin: 0 0 14px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--green);
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(2.5rem, 11vw, 3.7rem);
  line-height: 1.02;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lede {
  margin: 0 0 26px;
  font-size: 1.08rem;
  line-height: 1.55;
  color: var(--dim);
  max-width: 30em;
}

.privacy {
  margin: 0 0 30px;
  padding: 16px 18px;
  border: 1px solid rgba(37,211,102,0.30);
  border-radius: 14px;
  background: rgba(37,211,102,0.07);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--dim);
}
.privacy strong { color: var(--green); display: block; margin-bottom: 4px; }

/* ---------- drop zone ---------- */
#drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 44px 24px;
  border: 2px dashed rgba(37,211,102,0.45);
  border-radius: 20px;
  background: var(--bg-lift);
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .12s;
}
#drop:hover, #drop:focus-visible { border-color: var(--green); background: rgba(37,211,102,0.10); }
#drop:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }
#drop.dragging { border-color: var(--green); background: rgba(37,211,102,0.16); transform: scale(1.01); }

.drop-icon { font-size: 2.1rem; line-height: 1; }
.drop-main { font-size: 1.12rem; font-weight: 700; }
.drop-sub { font-size: 0.92rem; color: var(--dim); }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  padding: 1px 5px;
  border-radius: 5px;
  background: rgba(255,255,255,0.09);
}

.error {
  margin: 18px 0 0;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid rgba(255,122,107,0.42);
  background: rgba(255,122,107,0.10);
  color: var(--coral);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ---------- how-to ---------- */
.how { margin-top: 30px; border-top: 1px solid var(--line); padding-top: 18px; }
.how summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--dim);
  list-style: none;
}
.how summary::-webkit-details-marker { display: none; }
.how summary::before { content: "＋ "; color: var(--green); font-weight: 800; }
.how[open] summary::before { content: "－ "; }
.how summary:hover { color: var(--ink); }
.how-body { padding-top: 12px; font-size: 0.95rem; line-height: 1.65; color: var(--dim); }
.how-body p { margin: 0 0 10px; }
.how-body strong { color: var(--ink); }

/* ---------- working ---------- */
#working { text-align: center; padding-top: 70px; }
.spinner {
  width: 42px; height: 42px; margin: 0 auto 22px;
  border: 3px solid rgba(37,211,102,0.22);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 3s; } }
.working-text { margin: 0 0 6px; font-size: 1.12rem; font-weight: 700; }
.working-sub { margin: 0; font-size: 0.92rem; color: var(--dim); }

/* ---------- result ---------- */
.card-frame {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 26px 70px rgba(0,0,0,0.55);
  line-height: 0;
}
#cardImg { width: 100%; height: auto; display: block; }

.actions { display: flex; gap: 10px; margin: 20px 0 8px; flex-wrap: wrap; }
.btn {
  flex: 1 1 160px;
  padding: 15px 20px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: var(--bg-lift);
  color: var(--ink);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s, transform .08s;
}
.btn:hover { background: rgba(255,255,255,0.10); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--green); border-color: var(--green); color: #05120B; }
.btn.primary:hover { background: #31e274; }

.save-hint { margin: 0 0 26px; font-size: 0.85rem; color: var(--dim); text-align: center; }

/* ---------- readout ---------- */
.readout { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.readout .row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
  padding: 14px 16px; background: #071A12;
}
.readout .row span:first-child { color: var(--dim); font-size: 0.92rem; }
.readout .row span:last-child { font-weight: 700; text-align: right; }

.footnote { margin: 18px 0 0; font-size: 0.8rem; color: var(--dim); line-height: 1.6; }

.page-footer {
  padding: 26px 20px 38px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--dim);
  border-top: 1px solid var(--line);
}
.page-footer p { margin: 0; }

/* ---------- hide-names toggle ---------- */
.mask-row {
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg-lift);
}
.switch { display: flex; align-items: center; gap: 12px; cursor: pointer; user-select: none; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.track {
  flex: none;
  width: 46px; height: 27px;
  border-radius: 999px;
  background: rgba(255,255,255,0.16);
  transition: background .16s;
  display: flex; align-items: center; padding: 3px;
}
.knob {
  width: 21px; height: 21px; border-radius: 50%;
  background: var(--ink);
  transition: transform .16s;
}
.switch input:checked + .track { background: var(--green); }
.switch input:checked + .track .knob { transform: translateX(19px); background: #05120B; }
.switch input:focus-visible + .track { outline: 2px solid var(--green); outline-offset: 3px; }
.switch-label { font-size: 0.97rem; font-weight: 600; }

.who { margin-top: 14px; padding-top: 13px; border-top: 1px solid var(--line); }
.who-q { display: block; font-size: 0.9rem; color: var(--dim); margin-bottom: 9px; }
.who-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.who-btns button {
  padding: 9px 15px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
}
.who-btns button:hover { background: rgba(255,255,255,0.08); }
.who-btns button[aria-pressed="true"] {
  background: var(--green); border-color: var(--green); color: #05120B;
}