:root {
  --bg: #f3f4f6; --card: #fff; --text: #111827; --muted: #6b7280;
  --accent: #1f6feb; --accent-hover: #1a5fd0; --border: #d1d5db; --hover: #f3f4f6;
  --error: #b91c1c; --ok: #047857; --danger: #dc2626;
  --shadow: 0 8px 24px rgba(0,0,0,.12);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117; --card: #161b22; --text: #e6edf3; --muted: #8b949e; --border: #30363d;
    --hover: #21262d; --error: #f87171; --ok: #34d399; --danger: #f85149; --shadow: 0 8px 24px rgba(0,0,0,.5);
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0; min-height: 100vh;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg); color: var(--text);
}

/* ---------- sign-in ---------- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.card {
  width: 100%; max-width: 380px; background: var(--card);
  border: 1px solid var(--border); border-radius: 12px; padding: 32px 28px;
}
.brand { font-size: 17px; font-weight: 700; letter-spacing: .01em; color: var(--muted); margin: 0 0 8px; text-decoration: none; }
h2 { margin: 0 0 20px; font-size: 22px; }
h3 { margin: 0 0 16px; font-size: 18px; }
label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 16px; }
input:not([type="checkbox"]) {
  display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit;
  color: inherit; background: transparent; border: 1px solid var(--border); border-radius: 8px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
input[readonly] { color: var(--muted); }
input[name="code"] { font-size: 24px; letter-spacing: 8px; text-align: center; }
.card button[type="submit"] { width: 100%; }
button, .btn {
  padding: 10px 16px; font: inherit; font-weight: 600; color: #fff;
  background: var(--accent); border: 0; border-radius: 8px; cursor: pointer;
}
button:hover, .btn:hover { background: var(--accent-hover); }
button:disabled { opacity: .6; cursor: wait; }
button.link { width: auto; background: none; color: var(--accent); padding: 4px 0; font-weight: 500; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { background: var(--hover); }
.btn.danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn.danger:hover { background: var(--danger); color: #fff; }
.btn.small { padding: 5px 12px; font-size: 14px; }
.row { display: flex; justify-content: space-between; margin-top: 12px; }
.muted { color: var(--muted); font-size: 14px; }
#msg { min-height: 1.5em; margin: 16px 0 0; font-size: 14px; color: var(--error); }
#msg.ok { color: var(--ok); }

/* ---------- app shell ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 16px;
  padding: 10px 24px; background: var(--card); border-bottom: 1px solid var(--border);
}
.topbar .brand { margin: 0; color: var(--text); }
.user-menu { margin-left: auto; }
.user-btn { display: flex; align-items: center; gap: 8px; padding: 5px 12px 5px 6px; max-width: 260px; }
.user-btn #user-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.avatar { display: grid; place-items: center; width: 28px; height: 28px; flex: none; border-radius: 50%; background: var(--accent); color: #fff; font-size: 13px; font-weight: 700; text-transform: uppercase; }
.user-menu .menu-list { left: auto; right: 0; min-width: 240px; }
.menu-head { display: flex; flex-direction: column; padding: 8px 12px 4px; font-size: 14px; }
.menu-head .muted { font-size: 13px; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 520px) { .user-btn #user-name { display: none; } .topbar { padding: 10px 16px; gap: 10px; } }

.menu { position: relative; }
.menu-btn { background: transparent; color: var(--text); border: 1px solid var(--border); padding: 7px 14px; }
.menu-btn:hover, .menu-btn[aria-expanded="true"] { background: var(--hover); }
.menu-list {
  position: absolute; top: calc(100% + 6px); left: 0; min-width: 200px;
  margin: 0; padding: 6px; list-style: none;
  background: var(--card); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow);
}
.menu-list button {
  display: block; width: 100%; text-align: left; padding: 9px 12px;
  background: transparent; color: var(--text); font-weight: 500; border-radius: 6px;
}
.menu-list button:hover, .menu-list button:focus-visible { background: var(--hover); outline: none; }
.menu-list button[aria-current="page"] { color: var(--accent); }
.menu-list .sep { height: 1px; margin: 6px 4px; background: var(--border); }

.content { max-width: 1100px; margin: 0 auto; padding: 28px 24px; }
.view-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.view-head h2 { margin: 0; }

.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--border); border-radius: 10px; }
table.users { width: 100%; border-collapse: collapse; font-size: 14px; }
.users th, .users td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.users th { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 600; }
.users tbody tr:last-child td { border-bottom: 0; }
.users tbody tr:hover { background: var(--hover); }
.users td:last-child { text-align: right; }
.users .you { color: var(--muted); font-weight: 400; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; border: 1px solid currentColor; }
.badge.admin { color: var(--accent); }
.badge.on { color: var(--ok); }
.badge.off { color: var(--muted); }
.badge.locked { color: var(--danger); }

/* ---------- dialog ---------- */
dialog {
  width: min(440px, calc(100% - 32px)); padding: 24px; color: var(--text);
  background: var(--card); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(0,0,0,.45); }
.checks { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 8px; }
.check { display: flex; align-items: center; gap: 8px; font-weight: 500; margin: 0; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }
.error { min-height: 1.4em; margin: 8px 0; font-size: 14px; color: var(--error); }
.dialog-actions { display: flex; gap: 8px; align-items: center; }
.spacer { flex: 1; }

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  padding: 10px 18px; border-radius: 8px; font-size: 14px;
  background: var(--text); color: var(--card); box-shadow: var(--shadow);
}

@media (max-width: 600px) {
  .topbar { padding: 10px 16px; gap: 10px; }
  .content { padding: 20px 16px; }
  .who { display: none; }
}

/* ---------- password forms ---------- */
.panel { max-width: 420px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 28px; }
.panel button[type="submit"] { width: 100%; }
.notice { padding: 10px 12px; border-radius: 8px; border: 1px solid var(--accent); font-size: 14px; margin: 0 0 16px; }
.badge.warn { color: #b45309; }
@media (prefers-color-scheme: dark) { .badge.warn { color: #fbbf24; } }

/* ---------- home hero ---------- */
.hero { margin: 0 0 24px; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); background: #2b4a72; }
.hero img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 7; object-fit: cover; object-position: center 60%; }
@media (max-width: 600px) { .hero img { aspect-ratio: 4 / 3; object-position: 30% center; } }