.app-shell { min-height: 100vh; }
.site-header { width: min(1500px, calc(100% - 40px)); height: 72px; margin: 0 auto; border-bottom: var(--border-width) solid var(--color-border-strong); display: flex; align-items: center; justify-content: space-between; }
.brand { color: var(--color-ink); display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -0.02em; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 32px; height: 32px; border-radius: var(--radius-control); color: var(--color-ink-on-accent); background: var(--color-accent); font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; }
.panel { min-width: 0; border: var(--border-width) solid var(--color-border-strong); border-radius: var(--radius-panel); background: var(--color-surface); box-shadow: var(--shadow-none); }
.section-heading { display: flex; align-items: flex-start; gap: 14px; }
.section-heading h2 { margin: 1px 0 4px; font-size: 0.9375rem; font-weight: 700; letter-spacing: -0.01em; }
.section-heading p { margin: 0; color: var(--color-ink-muted); font-size: 0.75rem; }
.section-step { color: var(--color-accent); font-family: var(--font-mono); font-size: 0.6875rem; font-weight: 600; line-height: 24px; }
.ui-button, .button { min-height: 38px; padding: 0 14px; border: var(--border-width) solid var(--color-border-strong); border-radius: var(--radius-control); color: var(--color-ink); background: var(--color-surface); display: inline-flex; align-items: center; justify-content: center; gap: 6px; font-size: 0.75rem; font-weight: 700; text-decoration: none; transition: color var(--duration-fast), background var(--duration-fast), border-color var(--duration-fast); }
.ui-button:hover:not(:disabled), .button:hover:not(:disabled) { border-color: var(--color-accent); color: var(--color-accent); }
.ui-button:active:not(:disabled), .button:active:not(:disabled) { background: var(--color-surface-subtle); }
.ui-button:disabled, .button:disabled { opacity: 0.42; }
.ui-button--primary, .button-primary { border-color: var(--color-accent); color: var(--color-ink-on-accent); background: var(--color-accent); }
.ui-button--primary:hover:not(:disabled), .button-primary:hover:not(:disabled) { border-color: var(--color-accent-hover); color: var(--color-ink-on-accent); background: var(--color-accent-hover); }
.ui-button--danger { border-color: var(--color-danger); color: var(--color-danger); }
.ui-button--quiet { border-color: var(--color-border); background: transparent; }
.form-field { display: grid; gap: 7px; min-width: 0; }
.form-field > label { color: var(--color-ink); display: flex; justify-content: space-between; font-size: 0.75rem; font-weight: 600; }
.form-field small { color: var(--color-ink-muted); font-size: 0.625rem; font-weight: 400; }
.ui-toggle { min-height: 56px; margin: 5px 0; padding: 11px 0; border-top: var(--border-width) solid var(--color-border); border-bottom: var(--border-width) solid var(--color-border); display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
.ui-toggle > span { display: flex; flex-direction: column; gap: 3px; }
.ui-toggle strong { color: var(--color-ink); font-size: 0.75rem; font-weight: 600; }
.ui-toggle small { color: var(--color-ink-muted); font-size: 0.625rem; }
.ui-status { min-height: 42px; margin: 0; padding: 13px var(--space-5); border-top: var(--border-width) solid var(--color-border-strong); color: var(--color-ink-muted); font-family: var(--font-mono); font-size: 0.625rem; }
.ui-status--danger { color: var(--color-danger); background: var(--color-danger-surface); }

@media (max-width: 640px) {
    .site-header { width: min(100% - 24px, 1500px); }
}