:root{
    --bg:#fff;
    --ink:#000;
    --muted: rgba(0,0,0,.55);
    --line: rgba(0,0,0,.22);
    --line2: rgba(0,0,0,.14);
    --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --sans: Arial, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box;}
html,body{height:100%;}
body{
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    overflow-x:hidden;
}

#bg{
    position:fixed;
    inset:0;
    width:100vw;
    height:100vh;
    z-index:0;
    pointer-events:none;
}

/* NAV */
.top-nav{
    position:fixed;
    top:18px;
    left:18px;
    right:18px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    z-index:20;
}
.nav-right{display:flex; gap:12px; align-items:center;}

.nav-btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-width: 150px;
    height: 56px;
    padding: 0 18px;
    border: 2px solid var(--ink);
    background: transparent;
    color: var(--ink);
    text-decoration:none;
    font-size: 14px;
    letter-spacing:.4px;
    user-select:none;
    transition: transform .12s ease, background .2s ease, opacity .2s ease;
}
.nav-btn:hover{ background: rgba(0,0,0,.04); transform: translateY(-1px); }
.nav-btn:active{ transform: translateY(0); opacity:.85; }

.shell{
    position:relative;
    z-index:5;
    width:min(1120px, calc(100vw - 40px));
    margin: 0 auto;
    padding: 110px 0 44px;
}

.mono{ font-family: var(--mono); letter-spacing:.7px; }

/* HERO */
.hero{
    position:relative;
    padding: 26px 24px 22px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.78);
    backdrop-filter: blur(4px);
    overflow:hidden;
}

.kicker{
    font-size: 12px;
    text-transform: uppercase;
    color: var(--muted);
}

.title{
    margin-top:10px;
    font-size: clamp(28px, 4.4vw, 58px);
    line-height: 1.02;
    font-weight: 800;
    letter-spacing: .6px;
    position:relative;
}

.title-ghost{
    position:absolute;
    left:0;
    top:0;
    transform: translate(2px, 12px);
    font-size: clamp(28px, 4.4vw, 58px);
    font-weight: 800;
    color: rgba(0,0,0,.055);
    pointer-events:none;
    user-select:none;
}

.lead{
    margin-top: 14px;
    max-width: 92ch;
    color: rgba(0,0,0,.72);
    line-height: 1.7;
}

.meta{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    margin-top: 14px;
}
.pill{
    font-size: 12px;
    padding: 6px 10px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.65);
}

/* Scan ring vibe (different from directory) */
.scanline{
    pointer-events:none;
    position:absolute;
    inset:-60px;
    opacity:.12;
    background:
            radial-gradient(circle at 50% 45%,
            transparent 0%,
            transparent 36%,
            rgba(0,0,0,.28) 37%,
            transparent 38%,
            transparent 52%,
            rgba(0,0,0,.22) 53%,
            transparent 54%,
            transparent 100%);
    animation: ring 6.8s ease-in-out infinite;
}
@keyframes ring{
    0%,100%{ transform: rotate(0deg) scale(1); }
    50%{ transform: rotate(14deg) scale(1.02); }
}

/* PANELS */
.panel{
    border: 1px solid var(--line);
    background: rgba(255,255,255,.78);
    backdrop-filter: blur(4px);
}

.panel-head{
    display:flex;
    align-items:flex-end;
    justify-content:space-between;
    gap:12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--line2);
}
.panel-title{
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 1.6px;
    font-size: 12px;
}
.panel-tag{
    font-family: var(--mono);
    font-size: 12px;
    color: var(--muted);
}

.copy{
    padding: 16px 16px 18px;
    line-height: 1.78;
    color: rgba(0,0,0,.78);
}
.copy p{ margin: 0 0 14px; }
.copy p:last-child{ margin-bottom:0; }

.quiet{ color: rgba(0,0,0,.64); }
.warn{
    border-left: 3px solid rgba(0,0,0,.55);
    padding-left: 12px;
    color: rgba(0,0,0,.8);
}
.emph{
    border-left: 3px solid var(--ink);
    padding-left: 12px;
}

/* Layout */
.grid{
    margin-top: 16px;
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.grid3{
    margin-top: 16px;
    display:grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 14px;
}

/* deny box */
.deny{
    border: 1px solid var(--line2);
    background: rgba(255,255,255,.62);
    padding: 12px 12px;
    margin-bottom: 12px;
}
.deny-title{
    font-size: 12px;
    color: rgba(0,0,0,.62);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.deny ul{
    margin: 10px 0 10px 18px;
}
.deny li{ margin: 6px 0; }
.deny-foot{
    color: rgba(0,0,0,.66);
    line-height: 1.7;
}

/* steps */
.steps{
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 12px 0 14px;
}
.step{
    border: 1px solid var(--line2);
    background: rgba(255,255,255,.65);
    padding: 10px 10px;
    display:flex;
    gap:10px;
    align-items:flex-start;
}
.step-n{
    font-size: 12px;
    color: rgba(0,0,0,.62);
    min-width: 24px;
}
.step-t{ font-size: 13px; }

/* bullets */
.bullets{
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 12px 0 14px;
}
.b{
    border: 1px solid var(--line2);
    background: rgba(255,255,255,.65);
    padding: 10px 10px;
    font-size: 13px;
}

/* checklist */
.checklist{
    margin: 12px 0 14px;
    display:grid;
    gap: 10px;
}
.c{
    border: 1px solid var(--line2);
    background: rgba(255,255,255,.65);
    padding: 10px 10px;
    font-size: 13px;
}

/* pair */
.pair{
    margin: 12px 0 12px;
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.pair-col{
    border: 1px solid var(--line2);
    background: rgba(255,255,255,.65);
    padding: 12px 12px;
}
.pair-k{
    font-size: 12px;
    color: rgba(0,0,0,.60);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.pair-v{
    margin-top: 6px;
    font-size: 13px;
}

/* index */
.index{ margin-top: 16px; }
.index-grid{
    margin-top: 12px;
    display:grid;
    grid-template-columns: repeat(5, minmax(190px, 1fr));
    gap: 10px;
}
.entry{
    display:block;
    text-decoration:none;
    color: var(--ink);
    border: 1px solid var(--line2);
    background: rgba(255,255,255,.65);
    padding: 12px 12px 14px;
    transition: transform .12s ease, background .2s ease;
}
.entry:hover{ transform: translateY(-1px); background: rgba(0,0,0,.03); }
.entry:active{ transform: translateY(0); opacity:.86; }

.entry-top{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
}
.entry-code{ font-size: 12px; color: rgba(0,0,0,.65); }
.entry-state{ font-size: 11px; color: rgba(0,0,0,.55); }
.entry-name{
    margin-top: 10px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: .2px;
}
.entry-hint{
    margin-top: 6px;
    font-size: 12.5px;
    color: rgba(0,0,0,.62);
}
.note{
    margin-top: 12px;
    color: rgba(0,0,0,.55);
}

/* reveal */
.reveal{
    opacity:0;
    transform: translateY(8px);
    transition: opacity .6s ease, transform .6s ease;
}
.reveal.is-in{ opacity:1; transform: translateY(0); }

/* footer */
.foot{ margin-top: 18px; padding: 18px 2px 0; }
.foot-line{ height:1px; background: var(--line); }
.foot-row{
    display:flex;
    justify-content:space-between;
    gap:12px;
    padding: 12px 2px 0;
    color: rgba(0,0,0,.55);
    font-size: 12px;
}

/* responsive */
@media (max-width: 1120px){
    .index-grid{ grid-template-columns: repeat(2, minmax(220px, 1fr)); }
    .grid3{ grid-template-columns: 1fr; }
}
@media (max-width: 860px){
    .grid{ grid-template-columns: 1fr; }
}
@media (max-width: 560px){
    .top-nav{ top:12px; left:12px; right:12px; }
    .nav-btn{ min-width: 110px; height: 48px; font-size: 13px; padding: 0 12px;}
    .shell{ width: calc(100vw - 24px); padding-top: 92px; }
    .steps{ grid-template-columns: 1fr; }
    .index-grid{ grid-template-columns: 1fr; }
}

/* reduced motion */
@media (prefers-reduced-motion: reduce){
    .scanline{ animation: none; }
    .reveal{ transition:none; }
    .nav-btn, .entry{ transition:none; }
}
/* ====== PROTOCOL SIDEBAR (drop-in) ====== */
.lr-side{
    position: fixed;
    right: 20px;
    top: 120px;
    z-index: 40;

    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: flex-end;

    /* 让整体有一点“浮起”的干净感（不影响主风格） */
    filter: drop-shadow(0 6px 14px rgba(0,0,0,.06));
}

.lr-side-btn{
    width: 210px;
    height: 46px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    border: 2px solid rgba(0,0,0,.9);
    background: rgba(255,255,255,.65);
    color: #000;

    text-decoration: none;
    user-select: none;

    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;
    font-size: 12px;
    letter-spacing: .18em;
    text-transform: uppercase;

    transition: transform .15s ease, background .18s ease, box-shadow .18s ease;
}

.lr-side-btn:hover{
    transform: translateX(-2px);
    background: rgba(255,255,255,.92);
}

.lr-side-btn.is-active{
    background: #fff;
    box-shadow: 0 0 0 2px rgba(0,0,0,.14) inset;
}

/* toggle button */
.lr-side-toggle{
    margin-top: 6px;
    width: 52px;
    height: 42px;

    border: 2px solid rgba(0,0,0,.9);
    background: rgba(255,255,255,.65);
    color: #000;
    cursor: pointer;

    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
    font-size: 14px;

    transition: transform .15s ease, background .18s ease;
}

.lr-side-toggle:hover{
    transform: translateX(-2px);
    background: rgba(255,255,255,.92);
}

/* collapsed */
.lr-side.is-collapsed .lr-side-btn{
    width: 52px;
    justify-content: center;
    letter-spacing: 0;
    font-size: 10px;
    padding: 0;
}
.lr-side.is-collapsed .lr-side-btn::after{
    /* 用短标记代替全文 */
    content: "•";
    font-size: 18px;
    line-height: 1;
}
.lr-side.is-collapsed .lr-side-btn{
    color: transparent;
}
.lr-side.is-collapsed .lr-side-btn.is-active{
    color: transparent;
}
.lr-side.is-collapsed .lr-side-btn.is-active::after{
    content: "⟡";
    font-size: 16px;
}

/* Mobile: 自动变成底部抽屉式（不占右侧空间） */
@media (max-width: 860px){
    .lr-side{
        right: 12px;
        left: 12px;
        top: auto;
        bottom: 12px;

        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;

        align-items: center;
    }
    .lr-side-btn{
        width: auto;
        padding: 0 12px;
        height: 42px;
        letter-spacing: .14em;
    }
    .lr-side-toggle{
        width: 52px;
        height: 42px;
    }
    .lr-side.is-collapsed{
        /* 手机上折叠成只剩 toggle */
        left: auto;
        right: 12px;
    }
    .lr-side.is-collapsed .lr-side-btn{
        display: none;
    }
}
/* ====== /PROTOCOL SIDEBAR ====== */