:root {
  --green: #046A38;
  --green-dark: #035229;
  --green-2: #4A9473;
  --green-3: #80C4A5;
  --green-tint: #EEF7F2;
  --text: #333333;
  --muted: #5F6B66;
  --bg: #F9FAFB;
  --card: #FFFFFF;
  --border: #E5E7EB;
  --danger: #B42318;
  --danger-tint: #FEF3F2;
  --radius: 10px;
  --focus: 0 0 0 3px rgba(4, 106, 56, 0.35);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a { color: var(--green); }
a:hover { color: var(--green-dark); }

:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 6px; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 16px; }
.wrap.narrow { max-width: 440px; }

/* Header & footer */
.site-header { background: var(--card); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 16px; padding-bottom: 16px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: var(--radius);
  background: var(--green); color: #fff; flex: none;
}
.brand h1 { margin: 0; font-size: 1.25rem; font-weight: 700; color: var(--green); letter-spacing: -0.01em; }
.tagline { margin: 0; font-size: 0.875rem; color: var(--muted); }
.logout { font-size: 0.875rem; font-weight: 500; text-decoration: none; padding: 6px 10px; border-radius: 8px; }
.logout:hover { background: var(--green-tint); }

main.wrap { flex: 1; padding-top: 24px; padding-bottom: 32px; }

.site-footer { border-top: 1px solid var(--border); background: var(--card); font-size: 0.875rem; color: var(--muted); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; }
.stage-badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  background: var(--green-tint); color: var(--green); border: 1px solid var(--green-3);
  font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em;
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 { margin: 0 0 14px; font-size: 1.05rem; font-weight: 600; display: flex; align-items: center; gap: 10px; }
.step {
  display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--green); color: #fff; font-size: 0.8rem; font-weight: 700; flex: none;
}
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; margin-bottom: 4px; }
.section-head h2 { margin-bottom: 8px; }
.hint { margin: 0 0 12px; font-size: 0.875rem; color: var(--muted); }
.empty { margin: 4px 0; color: var(--muted); font-size: 0.95rem; }

/* Drop zone */
.dropzone {
  border: 2px dashed var(--green-3);
  border-radius: var(--radius);
  background: var(--green-tint);
  padding: 28px 16px 18px;
  text-align: center;
  color: var(--green);
  transition: background-color .15s, border-color .15s;
}
.dropzone.over { background: #DDF0E6; border-color: var(--green); }
.dropzone .dz-title { margin: 6px 0 0; font-weight: 600; font-size: 1.05rem; color: var(--text); }
.dropzone .dz-sub { margin: 2px 0 10px; color: var(--muted); font-size: 0.875rem; }
.dropzone .hint { margin: 14px 0 0; }
.dropzone:focus-within .btn-secondary { box-shadow: var(--focus); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 18px;
  border-radius: 8px; border: 1px solid transparent;
  font: inherit; font-weight: 600; font-size: 0.95rem;
  cursor: pointer; text-decoration: none;
  transition: background-color .15s, border-color .15s, color .15s;
}
.btn:focus-visible { box-shadow: var(--focus); }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--green-dark); }
.btn-primary:disabled { background: #A7BFB2; cursor: not-allowed; }
.btn-secondary { background: var(--card); color: var(--green); border-color: var(--green); }
.btn-secondary:hover { background: var(--green); color: #fff; }
.btn-ghost { background: transparent; color: var(--green); border-color: var(--border); }
.btn-ghost:hover { background: var(--green-tint); border-color: var(--green-3); }
.btn-ghost.danger { color: var(--danger); }
.btn-ghost.danger:hover { background: var(--danger-tint); border-color: #FDA29B; }
.btn-sm { min-height: 36px; padding: 6px 12px; font-size: 0.85rem; font-weight: 500; }
.list-tools { display: flex; gap: 6px; flex-wrap: wrap; }

/* File list */
.file-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.file-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 10px 10px 8px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--card);
  transition: border-color .15s, box-shadow .15s, opacity .15s;
}
.file-row:hover { border-color: var(--green-3); }
.file-row.dragging { opacity: 0.45; }
.file-row.drop-before { box-shadow: 0 -3px 0 0 var(--green); }
.file-row.drop-after { box-shadow: 0 3px 0 0 var(--green); }
.file-row.flash { border-color: var(--green); background: var(--green-tint); }
.handle { color: #9CA3AF; cursor: grab; display: inline-flex; flex: none; padding: 4px 0; }
.handle:active { cursor: grabbing; }
.pos {
  flex: none; width: 28px; height: 28px; border-radius: 6px;
  display: inline-grid; place-items: center;
  background: var(--green-tint); color: var(--green); font-weight: 700; font-size: 0.85rem;
}
.meta { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.size { font-size: 0.8rem; color: var(--muted); }
.row-actions { display: flex; gap: 2px; flex: none; }
.icon-btn {
  display: inline-grid; place-items: center;
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid transparent; background: transparent; color: var(--muted);
  cursor: pointer;
}
.icon-btn:hover:not(:disabled) { background: var(--green-tint); color: var(--green); }
.icon-btn.remove:hover:not(:disabled) { background: var(--danger-tint); color: var(--danger); }
.icon-btn:disabled { opacity: 0.3; cursor: default; }
.icon-btn:focus-visible { box-shadow: var(--focus); }
.summary { margin: 12px 0 0; font-size: 0.875rem; color: var(--muted); }
.summary.over { color: var(--danger); font-weight: 500; }

/* Merge form */
.merge-form { display: flex; align-items: flex-end; gap: 12px; flex-wrap: wrap; }
.field { display: flex; flex-direction: column; gap: 6px; flex: 1 1 240px; }
.field label { font-weight: 500; font-size: 0.9rem; }
.field input,
.input-suffix {
  min-height: 44px; border: 1px solid #C9CFCC; border-radius: 8px; background: #fff;
  font: inherit; color: var(--text);
}
.field > input { padding: 10px 12px; width: 100%; }
.field input:focus { outline: none; border-color: var(--green); box-shadow: var(--focus); }
.input-suffix { display: flex; align-items: center; overflow: hidden; }
.input-suffix:focus-within { border-color: var(--green); box-shadow: var(--focus); }
.input-suffix input { flex: 1; min-width: 0; border: 0; min-height: 42px; padding: 10px 4px 10px 12px; }
.input-suffix input:focus { box-shadow: none; }
.input-suffix span { padding: 0 12px 0 2px; color: var(--muted); }
.merge-form .btn-primary { flex: 0 0 auto; }

.progress { margin-top: 16px; }
.progress-bar { height: 8px; border-radius: 999px; background: var(--border); overflow: hidden; }
.progress-bar span { display: block; height: 100%; width: 0; background: var(--green); transition: width .2s; }
.progress-bar.indeterminate span { width: 35%; animation: slide 1.1s ease-in-out infinite; background: var(--green-2); }
@keyframes slide { 0% { transform: translateX(-100%); } 100% { transform: translateX(300%); } }
.progress p { margin: 6px 0 0; font-size: 0.875rem; color: var(--muted); }

.message { margin-top: 16px; padding: 12px 14px; border-radius: 8px; font-size: 0.95rem; }
.message.ok { background: var(--green-tint); color: var(--green-dark); border: 1px solid var(--green-3); }
.message.error { background: var(--danger-tint); color: var(--danger); border: 1px solid #FDA29B; }
.message a { font-weight: 600; }

.alert { margin: 0 0 12px; padding: 10px 12px; border-radius: 8px; background: var(--danger-tint); color: var(--danger); border: 1px solid #FDA29B; font-size: 0.95rem; }
.login-form { display: flex; flex-direction: column; gap: 14px; }
.login-form .btn { width: 100%; }

@media (max-width: 560px) {
  .card { padding: 16px; }
  .brand h1 { font-size: 1.1rem; }
  .tagline { display: none; }
  .handle { display: none; }
  .file-row { gap: 8px; padding-left: 10px; }
  .merge-form .btn-primary { width: 100%; }
  .icon-btn { width: 34px; height: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}