:root {
  --bg: #141414;
  --card: #1c1c1c;
  --ink: #f5f5f5;
  --accent: #ff4d6d;
  --muted: #9a9a9a;
  --border: #f5f5f5;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Space Grotesk", "Archivo", system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 24px;
}
.wrap { width: 100%; max-width: 960px; }
.brand { font-size: 2rem; letter-spacing: -0.02em; margin-bottom: 20px; }
.brand span { color: var(--accent); }
.card {
  background: var(--card);
  border: 3px solid var(--border);
  box-shadow: 8px 8px 0 var(--accent);
  padding: 20px;
  margin-bottom: 20px;
  max-width: 400px;
}
label { display: block; font-weight: 700; margin-bottom: 8px; }
input {
  width: 100%;
  padding: 12px;
  background: #111;
  color: var(--ink);
  border: 3px solid var(--border);
  font-size: 1rem;
  margin-bottom: 12px;
  outline: none;
}
input:focus { border-color: var(--accent); }
.btn {
  display: inline-block;
  padding: 12px 20px;
  font-weight: 700;
  cursor: pointer;
  border: 3px solid var(--border);
  background: transparent;
  color: var(--ink);
  font-size: 1rem;
  transition: transform .05s, box-shadow .05s;
}
.btn:active { transform: translate(4px, 4px); }
.btn-accent { background: var(--accent); color: #141414; }
.err { color: var(--accent); margin-top: 8px; font-weight: 700; }

/* layout */
.layout {
  display: flex;
  gap: 20px;
  align-items: stretch;
  min-height: 70vh;
}
.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--card);
  border: 3px solid var(--border);
  box-shadow: 8px 8px 0 var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 72vh;
}
.list { display: flex; flex-direction: column; flex: 1; overflow-y: auto; }
.item {
  padding: 12px 14px;
  border-bottom: 2px solid var(--border);
  cursor: pointer;
  transition: background .08s;
}
.item:last-child { border-bottom: 0; }
.item:hover { background: #262626; }
.item.active { background: var(--accent); color: #141414; }
.item.active .muted { color: #3a3a3a; }
.item-subj { font-weight: 700; font-size: .9rem; margin-bottom: 6px; }
.item-meta { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; font-size: .78rem; }
.badge {
  display: inline-block;
  font-size: .68rem;
  font-weight: 700;
  padding: 2px 8px;
  border: 2px solid var(--ink);
  text-transform: uppercase;
  letter-spacing: .03em;
}
.badge.code,
.badge.signin,
.badge.household { background: var(--accent); color: #141414; }
.badge.other { background: #333; color: var(--ink); }

/* pagination */
.pager {
  display: flex;
  gap: 6px;
  padding: 10px 14px;
  border-top: 3px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.pg {
  min-width: 30px;
  padding: 6px 9px;
  border: 2px solid var(--border);
  background: transparent;
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
}
.pg.on { background: var(--accent); color: #141414; border-color: var(--accent); }
.pg:disabled { opacity: .35; cursor: default; }

.viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 3px solid var(--border);
  box-shadow: 8px 8px 0 var(--accent);
  overflow: hidden;
  min-width: 0;
}
.viewer-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 14px 16px;
  border-bottom: 3px solid var(--border);
  background: #161616;
}
.v-top { display: flex; align-items: center; gap: 10px; width: 100%; }
.v-subject { font-weight: 700; flex: 1; min-width: 0; }
.v-time { font-size: .78rem; }
.detail-bar {
  display: none;
  padding: 10px 14px;
  border: 3px solid var(--border);
  background: var(--card);
  flex-shrink: 0;
}
.back-btn {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--ink);
  font-weight: 700;
  padding: 6px 12px;
  font-size: .9rem;
  cursor: pointer;
}
.frame {
  width: 100%;
  flex: 1;
  border: 0;
  background: #ffffff;
  min-height: 400px;
}
.empty { padding: 14px; color: var(--muted); }
.muted { color: var(--muted); }
.hidden { display: none; }

@media (max-width: 720px) {
  .layout { flex-direction: column; min-height: 0; }
  .layout:not(.detail-open) .viewer { display: none; }
  .layout.detail-open .sidebar { display: none; }
  .layout.detail-open .detail-bar { display: block; }
  .sidebar { width: 100%; max-height: none; flex: 1; }
  .frame { min-height: 70vh; }
}