:root {
  --bg: #0f1115;
  --bg-2: #181b22;
  --bg-3: #232734;
  --text: #e8e9ed;
  --text-dim: #9ca0aa;
  --accent: #6c9bff;
  --accent-2: #4d7be6;
  --danger: #e85a5a;
  --danger-2: #c84545;
  --border: #2a2f3b;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  height: 100%;
}
.screen { min-height: 100vh; }

button {
  background: var(--bg-3); color: var(--text);
  border: 1px solid var(--border);
  padding: 0.5rem 0.9rem;
  border-radius: 6px; cursor: pointer;
  font-size: 0.9rem; font-family: inherit;
}
button:hover { background: #2c3142; }
button.primary { background: var(--accent); border-color: var(--accent); color: white; }
button.primary:hover { background: var(--accent-2); }
button.danger { background: var(--danger); border-color: var(--danger); color: white; }
button.danger:hover { background: var(--danger-2); }

input, textarea {
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border);
  padding: 0.5rem; border-radius: 6px;
  font-size: 0.95rem; width: 100%; font-family: inherit;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
input[type='file'] { padding: 0.3rem; }
label { display: block; margin: 0.6rem 0 0.2rem; color: var(--text-dim); font-size: 0.85rem; }
label > input { margin-top: 0.25rem; }

.error { color: var(--danger); margin: 0.5rem 0 0; font-size: 0.85rem; }
.success { color: #6cc78a; margin: 0.5rem 0 0; font-size: 0.85rem; }
.muted { color: var(--text-dim); font-size: 0.85rem; }

#login { display: flex; align-items: center; justify-content: center; }
#login .card { background: var(--bg-2); padding: 2rem; border-radius: 12px; min-width: 320px; box-shadow: var(--shadow); }
#login h1 { margin: 0 0 1rem; text-align: center; }
#login button { width: 100%; margin-top: 1rem; background: var(--accent); border-color: var(--accent); color: white; }
#login button:hover { background: var(--accent-2); }

#app header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.75rem 1.5rem;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
}
.nav { display: flex; gap: 0.75rem; align-items: baseline; }
.nav h2 { margin: 0; }
.actions { display: flex; gap: 0.5rem; }

main { max-width: 900px; margin: 0 auto; padding: 1.5rem; }

.upload-section {
  display: flex; gap: 0.5rem; align-items: center;
  background: var(--bg-2);
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.upload-section input[type='file'] { flex: 1; min-width: 200px; }

#file-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.4rem; }
#file-list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.6rem 0.85rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
}
#file-list li a {
  color: var(--accent);
  text-decoration: none;
  word-break: break-all;
  flex: 1;
  margin-right: 0.5rem;
}
#file-list li a:hover { text-decoration: underline; }
.file-meta { display: flex; gap: 0.5rem; align-items: center; flex-shrink: 0; }
.file-meta .size { color: var(--text-dim); font-size: 0.8rem; }
.file-meta .date { color: var(--text-dim); font-size: 0.75rem; }
.file-meta button { padding: 0.2rem 0.55rem; font-size: 0.75rem; }

.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 10; }
.modal {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  background: var(--bg-2); padding: 1.5rem; border-radius: 12px;
  min-width: 380px; max-width: 90vw; box-shadow: var(--shadow); z-index: 11;
}
.modal h2 { margin: 0 0 0.5rem; }
.modal-actions { display: flex; justify-content: flex-end; gap: 0.5rem; margin-top: 1.25rem; }