:root {
    color-scheme: light;
    --bg: #eef3f8;
    --panel: #ffffff;
    --text: #172235;
    --muted: #5c6c80;
    --primary: #1769aa;
    --primary-dark: #0e4f86;
    --border: #d4dee9;
    --danger-bg: #fff0f0;
    --danger: #a61b1b;
    --success-bg: #ecf8f0;
    --success: #176b38;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; }
.shell { width: min(920px, calc(100% - 32px)); margin: 48px auto; }
.brand { display: flex; gap: 14px; align-items: center; margin-bottom: 24px; }
.brand-mark { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; color: white; font-weight: 800; background: linear-gradient(135deg, #1888d6, #174d8f); }
.brand h1 { margin: 0; font-size: 1.55rem; }
.brand p { margin: 2px 0 0; color: var(--muted); }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 18px; padding: 28px; box-shadow: 0 14px 40px rgba(31, 55, 82, .08); }
h2 { margin-top: 0; }
.lead { color: var(--muted); }
.checks { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px; margin: 22px 0; padding: 0; list-style: none; }
.check { padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; }
.ok { color: var(--success); background: var(--success-bg); }
.bad { color: var(--danger); background: var(--danger-bg); }
fieldset { border: 0; padding: 0; margin: 28px 0 0; }
legend { font-size: 1.15rem; font-weight: 700; margin-bottom: 14px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
label { font-weight: 650; }
input { width: 100%; border: 1px solid #aebdcd; border-radius: 9px; padding: 11px 12px; font: inherit; color: inherit; background: white; }
input:focus { outline: 3px solid rgba(23, 105, 170, .2); border-color: var(--primary); }
.help { font-size: .88rem; color: var(--muted); }
.errors { padding: 14px 18px 14px 36px; border: 1px solid #efb4b4; border-radius: 10px; color: var(--danger); background: var(--danger-bg); }
.button { appearance: none; border: 0; border-radius: 10px; padding: 12px 20px; color: white; background: var(--primary); font: inherit; font-weight: 700; cursor: pointer; }
.button:hover { background: var(--primary-dark); }
.actions { margin-top: 24px; display: flex; justify-content: flex-end; }
code { padding: 2px 5px; border-radius: 5px; background: #e8eef5; }
@media (max-width: 650px) { .shell { margin: 24px auto; } .panel { padding: 20px; } .grid { grid-template-columns: 1fr; } }

.button-secondary { background: #52657a; }
.page-toolbar { display: flex; align-items: center; margin: -4px 0 20px; }
.page-back-button { display: inline-flex; align-items: center; gap: 8px; padding: 9px 14px; text-decoration: none; }
.page-back-button:hover { color: white; }
.app-version { width: min(920px, calc(100% - 32px)); margin: -28px auto 24px; color: var(--muted); font-size: .8rem; text-align: center; }