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

/* ── Variables ───────────────────────────────────────────── */
:root {
  --bg:        #f0f2f5;
  --card:      #ffffff;
  --border:    #e0e4ea;
  --text:      #1a1d23;
  --text-dim:  #6b7280;
  --accent:    #2563eb;
  --accent-h:  #1d4ed8;
  --success:   #059669;
  --error:     #dc2626;
  --radius:    12px;
  --shadow:    0 2px 16px rgba(0,0,0,.08);
}

/* ── Layout ─────────────────────────────────────────────── */
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}

.app {
  max-width: 1060px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

/* ── Header ─────────────────────────────────────────────── */
header {
  text-align: center;
  margin-bottom: 32px;
}
.logo { display: flex; justify-content: center; align-items: center;
        gap: 10px; margin-bottom: 6px; }
.logo-icon { font-size: 2rem; }
.logo-text { font-size: 2rem; font-weight: 800; letter-spacing: -.03em; color: var(--accent); }
.tagline { color: var(--text-dim); font-size: .9rem; }

/* ── Main grid ───────────────────────────────────────────── */
main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 720px) { main { grid-template-columns: 1fr; } }

/* ── Card ───────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-dim);
  margin-bottom: 18px;
}

/* ── Dropzone ───────────────────────────────────────────── */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  margin-bottom: 16px;
}
.dropzone:hover, .dropzone.over {
  border-color: var(--accent);
  background: #eff6ff;
}
.dz-inner {
  padding: 36px 20px;
  text-align: center;
  pointer-events: none;
}
.dz-icon { font-size: 2.5rem; margin-bottom: 10px; }
.dz-hint { font-size: .95rem; color: var(--text-dim); }
.dz-hint .link { color: var(--accent); text-decoration: underline; }
.dz-sub { font-size: .8rem; color: var(--text-dim); margin-top: 4px; }

/* ── Preview ─────────────────────────────────────────────── */
.preview-wrap {
  position: relative;
  margin-bottom: 16px;
  text-align: center;
}
.preview-wrap img {
  max-width: 100%;
  max-height: 240px;
  border-radius: 8px;
  border: 1px solid var(--border);
  object-fit: contain;
}
.btn-clear {
  position: absolute;
  top: 6px; right: 6px;
  background: rgba(0,0,0,.55);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 26px; height: 26px;
  font-size: .85rem;
  cursor: pointer;
  line-height: 26px;
  text-align: center;
}
.btn-clear:hover { background: rgba(0,0,0,.75); }
.hidden { display: none !important; }

/* ── Controls ───────────────────────────────────────────── */
.controls {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.ctrl-group { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 120px; }
.ctrl-group label {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-dim);
}
select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  font-size: .9rem;
  color: var(--text);
  cursor: pointer;
}
select:focus { outline: 2px solid var(--accent); border-color: transparent; }

/* ── Buttons ────────────────────────────────────────────── */
.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s, opacity .15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-h); }
.btn-primary:disabled { opacity: .45; cursor: not-allowed; }
.btn-icon { font-size: 1rem; }

/* ── Status message ──────────────────────────────────────── */
.status-msg {
  margin-top: 8px;
  min-height: 1.2em;
  font-size: .85rem;
  text-align: center;
}
.status-msg.ok    { color: var(--success); }
.status-msg.error { color: var(--error); }

/* ── Spinner ─────────────────────────────────────────────── */
.spinner {
  text-align: center;
  padding: 40px 0;
  color: var(--text-dim);
}
.spin-ring {
  width: 44px; height: 44px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Result field ───────────────────────────────────────── */
.result-field { position: relative; }
.result-field label {
  display: block;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-dim);
  margin-bottom: 6px;
}
#resultText {
  width: 100%;
  min-height: 160px;
  resize: vertical;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: .9rem;
  line-height: 1.5;
}
#resultText:focus { outline: 2px solid var(--accent); }

.btn-copy {
  position: absolute;
  top: 30px; right: 8px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: .8rem;
  cursor: pointer;
  opacity: .85;
}
.btn-copy:hover { opacity: 1; }

/* ── Stats row ───────────────────────────────────────────── */
.stat-row {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.stat {
  flex: 1;
  min-width: 90px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  text-align: center;
}
.stat-label {
  display: block;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.stat-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent);
}

/* ── Footer ─────────────────────────────────────────────── */
footer {
  text-align: center;
  margin-top: 40px;
  font-size: .8rem;
  color: var(--text-dim);
}
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }