/* Copy2Device — style.css
   Mobile-first, minimal, no dependencies */

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

:root {
  --c-bg:      #f8fafc;
  --c-surface: #ffffff;
  --c-border:  #e2e8f0;
  --c-text:    #0f172a;
  --c-muted:   #64748b;
  --c-accent:  #3b82f6;
  --c-accent2: #2563eb;
  --c-green:   #22c55e;
  --r:         12px;
  --shadow:    0 1px 3px rgb(0 0 0/.08), 0 6px 24px rgb(0 0 0/.05);
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  min-height: 100svh;
  display: flex;
  justify-content: center;
}

/* ── App shell ─────────────────────────────────────────────────── */
.app {
  width: 100%;
  max-width: 460px;
  min-height: 100svh;
  background: var(--c-surface);
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

@media (min-width: 480px) {
  .app {
    border-inline: 1px solid var(--c-border);
    box-shadow: var(--shadow);
  }
}

/* ── Header ────────────────────────────────────────────────────── */
header {
  padding: 20px 20px 14px;
  border-bottom: 1px solid var(--c-border);
  text-align: center;
  flex-shrink: 0;
}

.logo {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -.025em;
  color: var(--c-text);
}

.logo-sub {
  margin-top: 3px;
  font-size: .65rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-muted);
}

/* ── Screens ───────────────────────────────────────────────────── */
.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  flex: 1;
  padding: 28px 20px 36px;
  gap: 18px;
}

.screen.active { display: flex; }

/* ── Loading spinner ───────────────────────────────────────────── */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--c-border);
  border-top-color: var(--c-accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── QR code card ──────────────────────────────────────────────── */
.qr-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r);
  padding: 14px;
  box-shadow: var(--shadow);
  flex-shrink: 0;
}

.qr-card canvas, .qr-card img { display: block; }

/* ── Status pill ───────────────────────────────────────────────── */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 16px;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-size: .8rem;
  color: var(--c-muted);
  background: var(--c-bg);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-accent);
  animation: pulse 1.6s ease-in-out infinite;
  flex-shrink: 0;
}

.green-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-green);
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1);   }
  50%       { opacity: .3; transform: scale(.65); }
}

/* ── Connected badge ───────────────────────────────────────────── */
.conn-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .875rem;
  font-weight: 600;
  color: var(--c-green);
  align-self: flex-start;
}

/* ── Typography helpers ────────────────────────────────────────── */
.tagline {
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  color: var(--c-text);
}

h2 {
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  color: var(--c-text);
}

p {
  font-size: .875rem;
  color: var(--c-muted);
  text-align: center;
  line-height: 1.6;
}

.muted { color: var(--c-muted); font-size: .875rem; }

.emoji { font-size: 2.5rem; }

/* ── Content cards (send / received) ──────────────────────────── */
.card {
  width: 100%;
  border: 1px solid var(--c-border);
  border-radius: var(--r);
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--c-bg);
}

.card-label {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--c-muted);
}

textarea {
  width: 100%;
  min-height: 90px;
  padding: 10px 12px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  font: 1rem/1.5 inherit;
  background: var(--c-surface);
  color: var(--c-text);
  resize: vertical;
  transition: border-color .15s, box-shadow .15s;
}

textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgb(59 130 246 / .12);
}

textarea::placeholder { color: var(--c-muted); }

.received-text {
  padding: 10px 12px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  font: 1rem/1.5 inherit;
  background: var(--c-surface);
  color: var(--c-text);
  word-break: break-word;
  white-space: pre-wrap;
  min-height: 50px;
}

/* ── Buttons ───────────────────────────────────────────────────── */
.btn-primary {
  padding: 13px;
  background: var(--c-accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font: 600 .9375rem/1 inherit;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .15s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary:hover    { background: var(--c-accent2); }
.btn-primary:active   { transform: scale(.97); }
.btn-primary:disabled { background: #93c5fd; cursor: default; }

.btn-secondary {
  padding: 11px;
  background: transparent;
  color: var(--c-accent);
  border: 1.5px solid var(--c-accent);
  border-radius: 8px;
  font: 600 .9375rem/1 inherit;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .15s;
  -webkit-tap-highlight-color: transparent;
}

.btn-secondary:hover { background: rgb(59 130 246 / .06); }

.btn-sm {
  padding: 7px 12px;
  background: transparent;
  color: var(--c-accent);
  border: 1.5px solid var(--c-accent);
  border-radius: 6px;
  font: 600 .78rem/1 inherit;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  transition: background .15s;
}

.btn-sm:hover { background: rgb(59 130 246 / .06); }

/* ── "Share link manually" expandable section ──────────────────── */
.expando {
  width: 100%;
  border: 1px solid var(--c-border);
  border-radius: var(--r);
  overflow: hidden;
}

.expando summary {
  padding: 11px 14px;
  font-size: .825rem;
  color: var(--c-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.expando summary::-webkit-details-marker { display: none; }

.expando summary::before {
  content: '▶';
  font-size: .55rem;
  transition: transform .15s;
  color: var(--c-muted);
  flex-shrink: 0;
}

.expando[open] summary::before { transform: rotate(90deg); }

.expando-body {
  padding: 0 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.link-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.mono-input {
  flex: 1;
  min-width: 0;
  padding: 7px 10px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font: .72rem/1 ui-monospace, 'Cascadia Code', monospace;
  background: var(--c-bg);
  color: var(--c-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Native share button row ───────────────────────────────────── */
.share-row { width: 100%; }
.share-row .btn-secondary { width: 100%; }

/* ── Hints ─────────────────────────────────────────────────────── */
.hint {
  font-size: .72rem;
  color: var(--c-muted);
  line-height: 1.45;
  text-align: left !important;
}

.key-hint { text-align: right !important; }

/* ── Privacy note ──────────────────────────────────────────────── */
.privacy {
  font-size: .72rem !important;
  color: var(--c-muted) !important;
  text-align: center !important;
}

/* ── Copy confirmation ─────────────────────────────────────────── */
.copy-ok {
  text-align: center;
  font-size: .875rem;
  font-weight: 600;
  color: var(--c-green);
}

/* ── Dark mode ─────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --c-bg:      #0f172a;
    --c-surface: #1e293b;
    --c-border:  #334155;
    --c-text:    #f1f5f9;
    --c-muted:   #94a3b8;
  }

  /* Keep QR code readable (white background) */
  .qr-card { background: #ffffff; }
}

/* ── Focus-visible accessibility ───────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}