/* Trang đăng nhập / cài đặt / quản trị: cùng bảng màu với app */
:root{--bg:#f2f5f2;--sheet:#fff;--ink:#15231b;--muted:#4c5c52;--line:#d5ded7;--chip:#e6ece7;--chip-on:#0b4a2a;--chip-on-ink:#fff;--accent:#d81f2e;--ok:#1f7a45;--focus:#2b6cb0;color-scheme:light}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#0f1712;--sheet:#17221b;--ink:#e7efe9;--muted:#a9bcaf;--line:#2b3a30;--chip:#223027;--chip-on:#3fae6a;--chip-on-ink:#06140b;--accent:#ff5c66;--ok:#5fd08e;--focus:#7fb2f0;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#0f1712;--sheet:#17221b;--ink:#e7efe9;--muted:#a9bcaf;--line:#2b3a30;--chip:#223027;--chip-on:#3fae6a;--chip-on-ink:#06140b;--accent:#ff5c66;--ok:#5fd08e;--focus:#7fb2f0;color-scheme:dark}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:16px/1.5 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;min-height:100vh}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
a{color:var(--chip-on)}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px}
.brand .hz{background:var(--chip-on);color:var(--chip-on-ink);border-radius:8px;padding:2px 8px;font-size:18px}
.card{background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:22px}
.lab{display:block;font-size:13px;font-weight:600;margin:0 0 5px}
.field{display:flex;flex-direction:column;margin-bottom:14px}
.field small{color:var(--muted);font-size:13px;margin-top:4px}
input,select,textarea{border:1px solid var(--line);border-radius:8px;padding:10px 12px;background:var(--sheet);min-height:44px;width:100%}
textarea{min-height:120px;font-family:ui-monospace,Consolas,monospace;font-size:14px}
.btn{border:1px solid var(--line);background:var(--sheet);border-radius:8px;padding:10px 16px;font-weight:600;min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:6px;text-decoration:none;color:var(--ink)}
.btn.primary{background:var(--chip-on);color:var(--chip-on-ink);border-color:var(--chip-on)}
.btn.danger{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.btn:disabled{opacity:.5;cursor:default}
.btn.sm{min-height:34px;padding:5px 10px;font-size:14px}
.err{color:var(--accent);font-size:14.5px;margin:0 0 12px;min-height:1px}
.okmsg{color:var(--ok);font-size:14.5px}
.muted{color:var(--muted)}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{border:0;background:none;padding:9px 14px;min-height:40px}
.seg button[aria-pressed="true"]{background:var(--chip-on);color:var(--chip-on-ink)}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
/* đăng nhập */
.auth{min-height:100vh;display:grid;place-items:center;padding:24px 16px}
.auth .card{width:100%;max-width:400px}
.auth h1{font-size:22px;margin:16px 0 4px}
.auth p.sub{margin:0 0 18px;color:var(--muted);font-size:14.5px}
.auth .seg{width:100%;margin-bottom:18px}
.auth .seg button{flex:1}
.auth .btn.primary{width:100%}