:root {
  color-scheme: dark;
  --bg: #07090d;
  --panel: #0e1219;
  --panel2: #151b25;
  --border: #303948;
  --text: #f4f7fb;
  --muted: #aab4c3;
  --accent: #65b7ff;
  --danger: #ff6b6b;
  --focus: #ffffff;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
body { min-height: 100vh; }
button, input, select { font: inherit; }
button, .upload-btn { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible, .upload-btn:focus-within {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.container { width: min(1100px, calc(100% - 28px)); margin: 0 auto; padding: 28px 0 50px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 22px; margin-bottom: 18px; box-shadow: 0 8px 30px rgba(0,0,0,.22); }
.login-card { width: min(440px, 100%); margin: 10vh auto 0; }
.brand { font-size: 38px; }
h1, h2, p { margin-top: 0; }
h1 { font-size: 28px; margin-bottom: 5px; }
h2 { margin-bottom: 4px; font-size: 22px; }
.muted { color: var(--muted); }
label { display: grid; gap: 7px; margin: 14px 0; font-weight: 650; }
input, select {
  width: 100%; background: #080b10; color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 12px 13px;
}
button, .upload-btn {
  border: 1px solid var(--border); border-radius: 10px; padding: 11px 15px;
  color: var(--text); background: var(--panel2); font-weight: 750;
}
.primary, .upload-btn { background: var(--accent); color: #00111f; border-color: var(--accent); }
.secondary:hover, .upload-btn:hover { filter: brightness(1.15); }
button:disabled { opacity: .5; cursor: not-allowed; }
.error { color: var(--danger); min-height: 1.3em; margin: 12px 0 0; }
.topbar, .section-head, .file-row, .user-row { display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.topbar { margin-bottom: 18px; }
.brand-title { font-size: 24px; font-weight: 850; }
.actions { display: flex; gap: 8px; }
.notice { padding: 12px 15px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 18px; background: var(--panel2); }
.file-list, .user-list { margin-top: 18px; }
.file-row, .user-row { padding: 14px 0; border-top: 1px solid var(--border); }
.file-info { min-width: 0; }
.file-name { font-weight: 750; overflow-wrap: anywhere; }
.meta { color: var(--muted); font-size: 13px; margin-top: 3px; }
.file-actions { display: flex; gap: 7px; flex-shrink: 0; }
.danger { color: #fff; background: #5e1d25; border-color: #9e3542; }
.dropzone {
  margin-top: 18px; padding: 24px; border: 2px dashed var(--border);
  border-radius: 12px; text-align: center; color: var(--muted);
}
.user-form { display: grid; grid-template-columns: 1fr 1fr 150px auto; gap: 10px; align-items: end; }
.user-form input, .user-form select { margin: 0; }
.empty { padding: 35px 10px; text-align: center; color: var(--muted); }

@media (max-width: 700px) {
  .container { width: min(100% - 18px, 1100px); padding-top: 12px; }
  .card { padding: 16px; border-radius: 13px; }
  .section-head { align-items: flex-start; flex-direction: column; }
  .file-row, .user-row { align-items: flex-start; }
  .file-actions { flex-direction: column; }
  .user-form { grid-template-columns: 1fr; }
  .topbar { align-items: flex-start; }
}