:root {
    --bg:        #f5f6f9;
    --surface:   #ffffff;
    --fg:        #16181d;
    --muted:     #5b6471;
    --border:    #e3e6ec;
    --accent:    #4f46e5;
    --accent-hi: #4338ca;
    --danger:    #b42318;
    --danger-bg: #fef3f2;
    --radius:    8px;
    --shadow-1:  0 1px 2px rgba(16, 24, 40, 0.05);
    --shadow-2:  0 8px 24px rgba(16, 24, 40, 0.08);
    --font:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--fg);
    font: 15px/1.5 var(--font);
    -webkit-font-smoothing: antialiased;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--accent);
    text-decoration: none;
}
a:hover { text-decoration: underline; }
a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 2px;
}

.muted        { color: var(--muted); }
.small        { font-size: 0.875rem; }

/* ---------- Top bar ---------- */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--fg);
}
.brand:hover { text-decoration: none; }
.topnav a {
    margin-left: 1rem;
    color: var(--muted);
    font-weight: 500;
}
.topnav a:hover { color: var(--fg); text-decoration: none; }

/* ---------- Auth shell ---------- */
.auth-shell {
    flex: 1;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 3rem 1.5rem;
    margin: 0 auto;
    max-width: 960px;
    width: 100%;
}
.auth-shell--centered { align-items: center; }

.auth-card {
    width: 100%;
    max-width: 440px;
    background: var(--surface);
    padding: 2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-2);
}
.auth-card--wide { max-width: 540px; }
.auth-card h1 {
    margin: 0 0 0.25rem 0;
    font-size: 1.5rem;
    line-height: 1.25;
}
.auth-card .muted { margin: 0 0 1.5rem 0; }
.auth-help {
    margin: 1.25rem 0 0 0;
    text-align: center;
}

/* ---------- Form ---------- */
.form .field {
    display: grid;
    gap: 0.25rem;
    margin-bottom: 1rem;
}
.form label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--fg);
}
.form input,
.form select,
.form textarea {
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font: 0.9375rem var(--font);
    background: var(--surface);
    color: var(--fg);
    width: 100%;
}
.form textarea {
    min-height: 5rem;
    resize: vertical;
    font-family: var(--font);
}
.form input:focus,
.form select:focus,
.form textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.18);
}
.form input[aria-invalid="true"],
.form select[aria-invalid="true"],
.form textarea[aria-invalid="true"] { border-color: var(--danger); }

.form-error {
    background: var(--danger-bg);
    color: var(--danger);
    padding: 0.625rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.btn {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font: 600 0.9375rem var(--font);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover  { background: var(--accent-hi); }
.btn-primary[disabled] { opacity: 0.7; cursor: progress; }

.spinner {
    width: 0.875rem;
    height: 0.875rem;
    border: 2px solid rgba(255,255,255,0.45);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.form-links {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--muted);
    text-align: center;
}
.form-links .dot { margin: 0 0.5rem; }

/* ---------- Content pages (help / privacy / terms) ---------- */
.page {
    flex: 1;
    width: 100%;
    max-width: 760px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}
.page h1 {
    margin: 0 0 0.5rem 0;
    font-size: 1.75rem;
    line-height: 1.2;
}
.page .lede {
    margin: 0 0 2rem 0;
    color: var(--muted);
    font-size: 1rem;
}
.page section {
    background: var(--surface);
    padding: 1.5rem 1.5rem 1.25rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-1);
    margin-bottom: 1rem;
}
.page section h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.0625rem;
}
.page section p:last-child { margin-bottom: 0; }
.page .back-link {
    display: inline-block;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
}
.page dl.kv {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.5rem 1rem;
    margin: 0;
}
.page dl.kv dt { color: var(--muted); }
.page dl.kv dd { margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 1rem 1.5rem;
    font-size: 0.875rem;
    color: var(--muted);
}
.foot-row {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.site-footer nav a {
    margin-left: 1rem;
    color: var(--muted);
}
.site-footer nav a:hover { color: var(--fg); text-decoration: none; }

/* ---------- Inline confirmation panel (shown after submit on demo / reset forms) ---------- */
.inline-confirm {
    text-align: center;
    padding: 1rem 0;
}
.inline-confirm-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem auto;
}
.inline-confirm h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.25rem;
    color: var(--fg);
}
.inline-confirm p { margin: 0 0 0.75rem 0; }
.inline-confirm .form-links { margin-top: 1rem; }

/* ---------- Mobile ---------- */
@media (max-width: 720px) {
    .auth-shell { padding: 2rem 1rem; }
    .auth-card  { padding: 1.5rem; }
    .page       { padding: 2rem 1rem; }
    .topnav a { margin-left: 0.75rem; }
    .foot-row nav a { margin-left: 0.5rem; }
}