[hidden] { display: none !important; }
a { color: var(--text); text-underline-offset: 3px; }
.top-nav { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 0.7rem; padding: 0.4rem 0 1.25rem; font-size: 0.85rem; }
.page-heading { margin: 0.2rem 0 1.5rem; }
.eyebrow { font-size: 0.73rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 0.4rem; }
h1 { font-size: clamp(1.65rem, 4vw, 2.2rem); line-height: 1.2; letter-spacing: -0.025em; margin-bottom: 0.7rem; }
.lead { font-family: var(--font-reading); font-size: 1.16rem; line-height: 1.6; }
.tabs { display: flex; gap: 0.25rem; border-bottom: 1px solid var(--border); margin: 1.4rem 0; }
.tabs button { flex: 1; min-width: 0; border: 0; border-bottom: 3px solid transparent; border-top: 2px solid transparent; background: transparent; color: var(--text-muted); font: 600 0.9rem/1.35 var(--font-body); padding: 0.8rem 0.45rem; cursor: pointer; overflow-wrap: anywhere; }
.tabs button[aria-selected=true] { border-bottom-color: var(--text); border-top-color: var(--text); color: var(--text); }
.panel { padding: 0.25rem 0 1rem; }
.panel h2 { font-size: 1.35rem; line-height: 1.3; margin: 0 0 0.8rem; }
.panel h3 { font-size: 1rem; margin: 1.4rem 0 0.6rem; }
.panel p { margin: 0 0 1rem; }
.panel ol, .panel ul { padding-left: 1.5rem; margin: 0.8rem 0 1.2rem; }
.panel li { padding-left: 0.25rem; margin-bottom: 0.6rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.65rem; margin: 1.15rem 0 0.5rem; }
.button { display: inline-block; padding: 0.65rem 0.95rem; border: 1px solid var(--text); background: var(--text); color: var(--bg); text-decoration: none; font: 600 0.9rem/1.4 var(--font-body); border-radius: 2px; cursor: pointer; }
.button.secondary { background: transparent; color: var(--text); }
:focus-visible { outline: 3px solid var(--text); outline-offset: 4px; }
input[type=range]:focus-visible { outline: 3px solid var(--text); outline-offset: 4px; }
.quiet { color: var(--text-muted); font-size: 0.87rem; }
.note { padding: 0.9rem 1rem; background: var(--card-bg); border-left: 3px solid var(--border); margin: 1.2rem 0; }
.notice { padding: 0.9rem 1rem; border: 1px solid var(--border); background: var(--card-bg); }
.copy-status { min-height: 1.5em; font-size: 0.85rem; color: var(--text-muted); }
details { margin: 1.1rem 0; border: 1px solid var(--border); }
summary { padding: 0.8rem 1rem; font-weight: 600; cursor: pointer; }
.protocol-text { display: block; width: 100%; height: 27rem; resize: vertical; padding: 1rem; border: 0; border-top: 1px solid var(--border); background: var(--card-bg); color: var(--text); font: 0.84rem/1.6 ui-monospace, monospace; border-radius: 0; }
code { font: 0.88em ui-monospace, monospace; background: var(--card-bg); padding: 0.1em 0.25em; overflow-wrap: anywhere; }
.emergency-note { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.roadmap li strong { display: block; }
footer { margin-top: 2rem; }
@media (max-width: 420px) { .top-nav { align-items: flex-start; } .lang-nav { font-size: 0.73rem; } .tabs button { font-size: 0.8rem; } }

.intro p, .below-tabs p { margin-bottom: 1rem; }
.letter-header { gap: 1rem; }
.letter-header h1 { margin-bottom: 0; }
.levels dt { font-weight: 700; margin-top: .75rem; }
.levels dd { margin: .2rem 0 .75rem; }
.command-list { list-style: none; padding-left: 0 !important; }
.command-list code { display: inline-block; margin-right: .4rem; }
.future-commands { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .7rem; }
.below-tabs h3 { margin: 1.5rem 0 .6rem; }
@media (max-width: 520px) { .letter-header { flex-wrap: wrap; } }