:root {
  --bg: #1d1d1d; --card: #262626; --line: #353535; --fg: #e7e6e7; --muted: #9a999a;
  --accent: #0a84ff; --accent-hover: #3395ff; --ok: #30d158; --bad: #ff6961;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.5 Inter, "Segoe UI", system-ui, sans-serif; }
a { color: var(--accent); }
header { display: flex; align-items: center; gap: 16px; padding: 16px 24px; border-bottom: 1px solid var(--line); }
header .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--fg); text-decoration: none; }
header .brand img { width: 28px; height: 28px; border-radius: 7px; }
header .who { margin-left: auto; display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 14px; }
main { max-width: 1100px; margin: 0 auto; padding: 32px 24px 64px; }
h1 { font-size: 28px; margin: 0 0 6px; }
.muted { color: var(--muted); }
.error { color: var(--bad); min-height: 1.5em; margin: 6px 0 0; }
button, .button {
  font: inherit; font-weight: 600; border: 0; border-radius: 8px; padding: 9px 16px; cursor: pointer;
  background: var(--accent); color: #fff; text-decoration: none; display: inline-block;
}
button:hover, .button:hover { background: var(--accent-hover); }
button:disabled { opacity: .5; cursor: default; }
button.secondary { background: #3a3a3a; color: var(--fg); }
button.secondary:hover { background: #474747; }
button.link { background: none; color: var(--accent); padding: 0; font-weight: 500; }
input, textarea, select {
  font: inherit; color: var(--fg); background: #141414; border: 1px solid var(--line); border-radius: 8px; padding: 9px 12px; width: 100%;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.signin { display: grid; gap: 10px; max-width: 360px; }
.notice { background: #13314f; border: 1px solid #1d4f80; border-radius: 10px; padding: 12px 16px; margin-bottom: 24px; }
dialog { background: var(--card); color: var(--fg); border: 1px solid var(--line); border-radius: 14px; padding: 24px; width: min(420px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(0, 0, 0, .6); }
dialog h2 { margin: 0 0 12px; font-size: 20px; }
@media (max-width: 600px) { header, main { padding-left: 16px; padding-right: 16px; } }

[hidden] { display: none !important; }
.account-page { max-width: 820px; }
.account-card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px; margin-top: 24px; }
.account-card h2 { font-size: 18px; margin: 0; overflow-wrap: anywhere; }
.account-card p { margin: 8px 0 16px; }
.account-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.account-row button { flex: none; }
.account-list .account-row { padding: 16px 0; border-bottom: 1px solid var(--line); }
.account-list .account-row:last-child { border-bottom: 0; padding-bottom: 0; }
.link-page { max-width: 590px; }
.signin label { display: grid; gap: 6px; }
@media (max-width: 600px) { .account-row { align-items: flex-start; flex-direction: column; gap: 12px; } }