:root{
    --bg:#fff;
    --fg:#000;
    --muted: rgba(0,0,0,.55);
    --soft: rgba(0,0,0,.08);
    --line: rgba(0,0,0,.22);
    --hard: rgba(0,0,0,.65);
    --radius: 0px; /* 主站是硬边框 */
}

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

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

/* 顶部四角按钮风格 */
.top-nav{
    position: fixed;
    inset: 0;
    z-index: 10;
    pointer-events: none;
}
.top-nav .nav-btn{
    pointer-events: auto;
    position: fixed;
    top: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 220px;
    height: 70px;
    border: 2px solid var(--fg);
    color: var(--fg);
    text-decoration: none;
    font-size: 1rem;
    background: transparent;
    user-select: none;
    transition: background .2s ease, transform .2s ease;
}
.top-nav .nav-btn:hover{
    background: rgba(0,0,0,.05);
    transform: translateY(-1px);
}
.top-nav .nav-btn:active{
    transform: translateY(0px);
}

.top-nav .nav-btn:first-child{ left: 18px; }
.top-nav .nav-btn:last-child{ right: 18px; }

/* 主体壳 */
.shell{
    position: relative;
    z-index: 5;
    max-width: 980px;
    margin: 0 auto;
    padding: 120px 22px 70px;
}

/* Hero */
.hero{
    text-align: center;
    padding-top: 10px;
    padding-bottom: 24px;
}
.kicker{
    font-family: "Courier New", monospace;
    letter-spacing: 0.28em;
    font-size: 0.85rem;
    color: var(--muted);
    text-transform: uppercase;
}
.title{
    margin-top: 10px;
    font-size: clamp(2.2rem, 5vw, 4rem);
    letter-spacing: 0.06em;
    font-weight: 700;
}
.meta{
    margin-top: 14px;
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}
.pill{
    border: 1px solid var(--fg);
    padding: 8px 10px;
    font-family: "Courier New", monospace;
    font-size: .85rem;
    letter-spacing: .08em;
}

/* Panel */
.panel{
    border: 2px solid var(--fg);
    background: rgba(255,255,255,.72);
    backdrop-filter: blur(2px);
    margin-top: 18px;
    padding: 18px 18px 16px;
}
.panel-head{
    display:flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 12px;
}
.panel-title{
    font-family: "Courier New", monospace;
    letter-spacing: .16em;
    text-transform: uppercase;
    font-size: 0.95rem;
}
.panel-tag{
    font-family: "Courier New", monospace;
    font-size: .85rem;
    letter-spacing: .12em;
    color: var(--muted);
    text-transform: uppercase;
}

/* Text */
.copy p{
    margin-bottom: 12px;
    line-height: 1.65;
    color: rgba(0,0,0,.9);
    font-size: 1.02rem;
}
.copy .warn{
    color: rgba(0,0,0,.95);
    border-left: 3px solid var(--fg);
    padding-left: 12px;
}
.copy .quiet{
    color: rgba(0,0,0,.75);
}

/* Two-column */
.grid{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}
@media (max-width: 860px){
    .grid{ grid-template-columns: 1fr; }
    .top-nav .nav-btn{
        width: 170px;
        height: 62px;
        font-size: .95rem;
    }
}

/* Deny box */
.deny{
    margin-top: 10px;
    padding: 14px;
    border: 1px solid var(--fg);
}
.deny-title{
    font-family: "Courier New", monospace;
    letter-spacing: .14em;
    text-transform: uppercase;
    font-size: .9rem;
    margin-bottom: 10px;
}
.deny ul{
    margin-left: 18px;
    margin-bottom: 10px;
}
.deny li{
    margin: 6px 0;
}
.deny-foot{
    color: var(--muted);
    font-style: italic;
}

/* Entries */
.entries .note{
    margin-top: 12px;
    color: var(--muted);
    font-style: italic;
}
.entries-grid{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
@media (max-width: 720px){
    .entries-grid{ grid-template-columns: 1fr; }
}

.entry{
    display: block;
    border: 2px solid var(--fg);
    padding: 14px 14px 12px;
    text-decoration: none;
    color: var(--fg);
    background: transparent;
    transition: background .2s ease, transform .2s ease;
}
.entry:hover{
    background: rgba(0,0,0,.05);
    transform: translateY(-1px);
}
.entry:active{ transform: translateY(0px); }

.entry-code{
    font-family: "Courier New", monospace;
    letter-spacing: .18em;
    text-transform: uppercase;
    font-size: .9rem;
    color: rgba(0,0,0,.85);
}
.entry-name{
    margin-top: 6px;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: .02em;
}
.entry-hint{
    margin-top: 6px;
    font-family: "Courier New", monospace;
    color: var(--muted);
    font-size: .88rem;
    letter-spacing: .06em;
}

/* Footer */
.foot{
    margin-top: 26px;
    padding: 10px 0 0;
}
.foot-line{
    height: 2px;
    background: var(--fg);
    opacity: .25;
}
.foot-row{
    display:flex;
    justify-content: space-between;
    gap: 10px;
    padding-top: 10px;
    font-family: "Courier New", monospace;
    letter-spacing: .08em;
    text-transform: uppercase;
    font-size: .85rem;
    color: var(--muted);
}