:root {
    color-scheme: light;
    --accent: #079db5;
    --accent-hover: #078399;
    --ink: #202932;
    --muted: #717b86;
    --border: #e1e5e9;
    --surface: #ffffff;
    --canvas: #f7f8fa;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 280px; background: var(--canvas); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 14px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; }
[hidden] { display: none !important; }

.login-layout { display: grid; place-items: center; min-height: 100vh; min-height: 100svh; padding: 40px 24px; }
.login-card { width: 100%; max-width: 400px; min-width: 0; padding: 32px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); box-shadow: 0 2px 8px rgba(32, 41, 50, .035); }
.login-header { margin-bottom: 28px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { display: block; width: 32px; height: 32px; object-fit: contain; flex-shrink: 0; }
.brand-name { font-size: 16px; line-height: 1.5; font-weight: 600; }
.login-header h1 { margin: 24px 0 0; font-size: 22px; line-height: 1.4; font-weight: 600; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 7px; color: #424c57; font-size: 13px; line-height: 1.5; font-weight: 500; }
.form-group input { display: block; width: 100%; min-width: 0; height: 42px; padding: 9px 12px; border: 1px solid #d7dde3; border-radius: 4px; background: #fff; color: var(--ink); outline: none; transition: border-color .15s ease, box-shadow .15s ease; }
.form-group input::placeholder { color: #9ba3ac; }
.form-group input:hover:not(:focus):not([readonly]) { border-color: #b8c2cc; }
.form-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(7, 157, 181, .09); }
.form-group input[readonly] { color: var(--muted); }
.password-field { position: relative; }
.password-field input { padding-right: 64px; }
.password-toggle { position: absolute; top: 5px; right: 5px; height: 32px; padding: 0 9px; border: 0; border-radius: 3px; color: var(--muted); background: transparent; font-size: 12px; }
.password-toggle:hover { background: #f1f4f6; color: var(--ink); }
.password-toggle:disabled { color: #989da2; background: transparent; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.login-btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; min-height: 42px; margin-top: 8px; padding: 9px 14px; border: 1px solid var(--accent); border-radius: 4px; background: var(--accent); color: #fff; font-size: 14px; font-weight: 500; transition: background-color .15s ease, border-color .15s ease; }
.login-btn:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
.login-btn:disabled { background: #76b8c2; border-color: #76b8c2; }
.spinner { width: 15px; height: 15px; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: turn .75s linear infinite; }
.form-status { min-height: 0; margin: 12px 0 0; color: var(--muted); text-align: center; font-size: 12px; }
.form-status:empty { margin: 0; }
.error-message { margin: 0 0 20px; padding: 10px 12px; border: 1px solid #ecd3d0; border-radius: 4px; background: #fff8f7; color: #a3473d; font-size: 13px; overflow-wrap: anywhere; }

@keyframes turn { to { transform: rotate(360deg); } }

@media (max-width: 480px) {
    .login-layout { padding: 24px 16px; }
    .login-card { padding: 24px; }
    .form-group input { font-size: 16px; }
}

@media (max-height: 520px) {
    .login-layout { align-items: start; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; animation: none !important; }
}