:root {
  --bg0: #0f1412;
  --bg1: #17201c;
  --bg2: #1f2b25;
  --line: rgba(214, 232, 220, 0.12);
  --text: #e8f0ea;
  --muted: #8fa396;
  --accent: #5fd4a0;
  --accent-dim: #2f8f68;
  --danger: #e07a6a;
  --radius: 14px;
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(95, 212, 160, 0.16), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(70, 120, 100, 0.18), transparent 50%),
    linear-gradient(165deg, var(--bg0), #121a16 45%, #0c100e);
  background-attachment: fixed;
}

.hidden { display: none !important; }
code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(255,255,255,0.06);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.brand {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.15rem;
  color: var(--accent);
}

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.error { color: var(--danger); margin-top: 0.75rem; }

.login-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.login-panel {
  width: min(420px, 100%);
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(23, 32, 28, 0.85);
  backdrop-filter: blur(12px);
  animation: rise 0.5s ease both;
}

.login-panel h1 {
  margin: 0.35rem 0 0.5rem;
  font-size: 1.6rem;
  letter-spacing: -0.03em;
}

#login-form {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

input[type="password"],
textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg0);
  color: var(--text);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  font: inherit;
}

input[type="password"]:focus,
textarea:focus {
  outline: 2px solid rgba(95, 212, 160, 0.35);
  border-color: var(--accent-dim);
}

button {
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 10px;
  padding: 0.75rem 1rem;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, opacity 0.15s ease;
}

button:active { transform: scale(0.98); }
button:disabled { opacity: 0.4; cursor: not-allowed; }

button.primary,
#login-form button {
  background: var(--accent);
  color: #062016;
}

button.primary:hover:not(:disabled),
#login-form button:hover {
  background: #78e0b0;
}

button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

button.ghost:hover:not(:disabled) { background: rgba(255,255,255,0.04); }
button.danger { color: var(--danger); border-color: rgba(224, 122, 106, 0.35); }

.panel-view { min-height: 100vh; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}

.layout {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1rem, 3vw, 2rem);
  max-width: 1100px;
  margin: 0 auto;
}

.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 800px) {
  .upload-grid { grid-template-columns: 1fr; }
}

.drop-zone {
  position: relative;
  border: 1.5px dashed rgba(95, 212, 160, 0.35);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(95, 212, 160, 0.06), transparent 60%),
    var(--bg1);
  min-height: 280px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  animation: rise 0.45s ease both;
}

.pair-zone {
  border-color: rgba(120, 180, 220, 0.35);
  background:
    linear-gradient(180deg, rgba(120, 180, 220, 0.08), transparent 60%),
    var(--bg1);
  cursor: default;
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.dragover {
  border-color: var(--accent);
  background:
    linear-gradient(180deg, rgba(95, 212, 160, 0.12), transparent 60%),
    var(--bg2);
  outline: none;
}

.pair-zone:hover,
.pair-zone:focus-visible,
.pair-zone.dragover {
  border-color: #7eb8e0;
  background:
    linear-gradient(180deg, rgba(120, 180, 220, 0.14), transparent 60%),
    var(--bg2);
}

.drop-zone.dragover { transform: scale(1.01); }

.zone-label {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.pair-zone .zone-label { color: #7eb8e0; }

.drop-inner {
  padding: 1.5rem 1.25rem 1.25rem;
  text-align: center;
}

.drop-inner h2 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.drop-inner p { margin: 0.35rem 0; color: var(--muted); line-height: 1.5; font-size: 0.92rem; }

.pair-slots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin: 1rem 0 0.85rem;
}

.pair-slot {
  position: relative;
  min-height: 96px;
  border: 1px dashed rgba(255,255,255,0.18);
  border-radius: 12px;
  background: rgba(0,0,0,0.22);
  color: var(--muted);
  display: grid;
  place-items: center;
  gap: 0.2rem;
  padding: 0.5rem;
  overflow: hidden;
}

.pair-slot:hover { border-color: #7eb8e0; color: var(--text); }
.pair-slot.filled { border-style: solid; border-color: rgba(126, 184, 224, 0.45); }

.slot-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  opacity: 0.7;
}

.slot-text { font-size: 0.85rem; font-weight: 600; }

.slot-preview {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pair-slot.filled .slot-num,
.pair-slot.filled .slot-text { display: none; }

.pair-submit {
  width: 100%;
}

.progress {
  position: absolute;
  inset: auto 1rem 1rem 1rem;
  height: 36px;
  border-radius: 999px;
  background: rgba(0,0,0,0.35);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.progress .bar {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  transition: width 0.2s ease;
}

.progress span {
  position: relative;
  z-index: 1;
  font-size: 0.85rem;
  font-weight: 600;
}

.results {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(23, 32, 28, 0.72);
  padding: 1.25rem;
  animation: rise 0.55s ease both;
}

.results-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.results-head h2 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }

#links-box {
  margin-top: 0.75rem;
  min-height: 160px;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  resize: vertical;
}

.toast {
  margin-top: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  background: rgba(95, 212, 160, 0.15);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

.file-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
  max-height: 360px;
  overflow: auto;
}

.file-list li {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  padding: 0.55rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.18);
  animation: rise 0.35s ease both;
}

.thumbs {
  display: flex;
  gap: 4px;
}

.file-list img {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 8px;
  background: #000;
}

.file-list .thumbs img { width: 48px; height: 48px; }

.badge {
  display: inline-block;
  margin-right: 0.35rem;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(95, 212, 160, 0.18);
  color: var(--accent);
}

.badge.pair {
  background: rgba(126, 184, 224, 0.18);
  color: #7eb8e0;
}

.meta { min-width: 0; }
.meta strong {
  display: block;
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.meta a {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-decoration: none;
  word-break: break-all;
}
.meta a:hover { color: var(--accent); }

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .file-list li { grid-template-columns: 48px 1fr; }
  .file-list li button { grid-column: 1 / -1; }
}