/* Màn cổng vào: đăng nhập · đăng ký · bảo trì · tài khoản bị khoá — dùng chung bộ màu của trang học */
[hidden]{display:none!important}
html,body{margin:0}
img{max-width:100%}
.gate{min-height:100vh;display:grid;place-items:center;padding-block:40px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));position:relative;z-index:2}
.gate-card{width:100%;max-width:440px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);box-shadow:var(--shadow-violet);padding:32px 30px;display:flex;flex-direction:column;gap:18px}
.gate-logo{display:flex;align-items:center;gap:12px}
.gate-logo img.mark{height:38px;width:auto}
.gate-logo img.wordmark{height:16px;width:auto}
.gate-logo small{display:block;font-family:var(--f-mono);font-size:10px;letter-spacing:.14em;color:var(--muted);text-transform:uppercase;margin-top:5px}
.gate h1{font-family:var(--f-display);font-weight:800;font-size:28px;letter-spacing:-.03em;line-height:1.15;margin:0;text-wrap:balance}
.gate p{margin:0;color:var(--muted);font-size:15px}
.gate-tabs{display:flex;gap:4px;padding:4px;background:var(--surface-2);border:1px solid var(--line);border-radius:999px}
.gate-tabs button{flex:1;border:0;background:transparent;border-radius:999px;padding:9px 10px;font-weight:600;font-size:14px;color:var(--muted);cursor:pointer}
.gate-tabs button[aria-selected="true"]{background:var(--surface);color:var(--ink);box-shadow:0 0 0 1px var(--line),0 1px 3px rgba(15,31,75,.08)}
.gate form{display:flex;flex-direction:column;gap:12px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:14px;font-weight:600}
.field label span{font-weight:400;color:var(--muted)}
.field input,.field textarea{font:inherit;font-size:16px;color:var(--ink);background:var(--bg);border:1px solid var(--line-strong);border-radius:12px;padding:12px 14px;width:100%}
.field input:focus{outline:2px solid var(--blue-600);outline-offset:1px;border-color:transparent}
.gate .btn-main{border:0;border-radius:999px;padding:14px 20px;font-weight:700;font-size:15px;cursor:pointer;background:var(--grad);color:var(--on-grad);box-shadow:0 10px 26px -12px rgba(61,142,255,.7)}
.gate .btn-main[disabled]{opacity:.6;cursor:wait}
.gate .btn-line{border:1px solid var(--line-strong);background:transparent;border-radius:999px;padding:12px 20px;font-weight:600;font-size:15px;cursor:pointer;color:var(--ink)}
.gate .link{background:none;border:0;padding:0;color:var(--blue-600);font-weight:600;font-size:14px;cursor:pointer;align-self:flex-start}
.gate .msg{border-radius:12px;padding:12px 14px;font-size:14px;line-height:1.5}
.gate .msg.err{background:color-mix(in srgb,#D2453B 9%,transparent);border:1px solid color-mix(in srgb,#D2453B 35%,transparent);color:#9F2A22}
.gate .msg.ok{background:color-mix(in srgb,#1E9E62 9%,transparent);border:1px solid color-mix(in srgb,#1E9E62 35%,transparent);color:#146B43}
.gate .msg.info{background:var(--surface-2);border:1px solid var(--line)}
.gate .icon-big{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-size:28px;background:var(--grad);color:var(--on-grad)}
.gate .spinner{width:34px;height:34px;border-radius:50%;border:3px solid var(--line);border-top-color:var(--blue-600);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.gate .muted-sm{font-size:13px;color:var(--muted)}
.acct{display:flex;align-items:center;gap:8px;font-size:13px;white-space:nowrap}
.acct button{border:1px solid var(--line-strong);background:transparent;border-radius:999px;padding:6px 12px;font-size:13px;font-weight:600;cursor:pointer;color:var(--ink)}
.acct a.admin-link{display:inline-block;border:1px solid var(--ink);background:var(--ink);color:#fff;border-radius:999px;padding:6px 12px;font-size:13px;font-weight:600;text-decoration:none;opacity:1}
.acct .who{max-width:160px;overflow:hidden;text-overflow:ellipsis;color:var(--muted)}
.maint-bar{position:relative;z-index:3;background:#FFF4D6;color:#6B4A00;border-bottom:1px solid #F0D58A;font-size:14px;text-align:center;padding-block:8px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
@media (max-width:720px){.acct .who{display:none}}