:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --cta: #059669;
    --cta-hover: #047857;
    --bg: #f5f3ff;
    --card: #ffffff;
    --text: #1e1b4b;
    --muted: #6b6785;
    --line: #e4e0f4;
    --danger: #b42318;
    --danger-bg: #fef3f2;
    --ok: #05603a;
    --ok-bg: #ecfdf3;
    --radius: 12px;
    --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.5;
}

a { color: var(--primary); }
a:hover { color: var(--primary-hover); }

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 24px;
    background: #fff;
    border-bottom: 1px solid var(--line);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-mark {
    width: 12px;
    height: 28px;
    border-radius: 4px;
    background: linear-gradient(180deg, var(--primary), #818cf8);
}

.brand strong { display: block; font-size: 14px; }
.brand span { color: var(--muted); font-size: 12px; }

.topbar-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar-nav a {
    text-decoration: none;
    color: var(--muted);
    padding: 6px 0;
    border-bottom: 2px solid transparent;
}

.topbar-nav a.is-active {
    color: var(--text);
    border-color: var(--primary);
    font-weight: 600;
}

.muted { color: var(--muted); font-size: 13px; }

.page {
    max-width: 920px;
    margin: 0 auto;
    padding: 28px 20px 48px;
}

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 32px 28px;
    box-shadow: 0 12px 40px rgba(30, 27, 75, 0.06);
}

.auth-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: #eef2ff;
    color: var(--primary);
    display: grid;
    place-items: center;
    margin-bottom: 16px;
}

h1 { margin: 0 0 8px; font-size: 24px; letter-spacing: -0.02em; }
h2 { margin: 0 0 4px; font-size: 18px; }
.lead { margin: 0 0 20px; color: var(--muted); }

.page-head { margin-bottom: 20px; }

label {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
    font-weight: 600;
    font-size: 13px;
}

label small {
    font-weight: 400;
    color: var(--muted);
}

input[type="text"],
input[type="password"],
input[type="number"] {
    height: 42px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font: inherit;
    color: var(--text);
    background: #fff;
    width: 100%;
}

input:focus {
    outline: 2px solid #c7d2fe;
    border-color: var(--primary);
}

.btn-primary,
.btn-text {
    cursor: pointer;
    font: inherit;
}

.btn-primary {
    height: 44px;
    width: 100%;
    border: 0;
    border-radius: 8px;
    background: var(--cta);
    color: #fff;
    font-weight: 600;
    transition: background 160ms ease;
}

.btn-primary:hover { background: var(--cta-hover); }

.btn-text {
    border: 0;
    background: transparent;
    color: var(--muted);
    padding: 4px 0;
}

.btn-text:hover { color: var(--danger); }

.form-actions .btn-primary { width: auto; min-width: 140px; padding: 0 20px; }

.alert {
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.alert-error { background: var(--danger-bg); color: var(--danger); }
.alert-ok { background: var(--ok-bg); color: var(--ok); }

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}

.card-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 12px;
}

.card-head p { margin: 0; color: var(--muted); font-size: 13px; font-weight: 400; }

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 16px;
}

.span-2 { grid-column: 1 / -1; }

.switch {
    flex-direction: row;
    align-items: center;
    gap: 8px;
    margin: 0;
    font-weight: 600;
    cursor: pointer;
}

.switch input { width: 18px; height: 18px; accent-color: var(--primary); cursor: pointer; }

.hint { color: var(--muted); font-size: 13px; margin: 8px 0 0; }

.form-actions { margin-top: 8px; }

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

@media (max-width: 720px) {
    .grid-2 { grid-template-columns: 1fr; }
    .topbar { flex-wrap: wrap; }
    .page { padding: 20px 16px 40px; }
}