:root{
    --bg:#fff;
    --ink:#000;
    --ink-soft: rgba(0,0,0,.55);
    --ink-faint: rgba(0,0,0,.22);
    --line: rgba(0,0,0,.18);
    --line2: rgba(0,0,0,.10);
    --shadow: rgba(0,0,0,.06);
}

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

/* 背景网格：避免 0.05px 这类亚像素导致“100%缩放看不见” */
body::before{
    content:"";
    position:fixed; inset:0;
    pointer-events:none;
    background-image:
            linear-gradient(to right, var(--line) 1px, transparent 1px),
            linear-gradient(to bottom, var(--line2) 1px, transparent 1px);
    background-size: 24px 24px, 24px 24px;
    opacity:.35;
    z-index:0;
}

/* very subtle noise (纯黑白，使用渐变模拟颗粒感) */
body::after{
    content:"";
    position:fixed; inset:0;
    pointer-events:none;
    background:
            radial-gradient(circle at 20% 30%, rgba(0,0,0,.05), transparent 35%),
            radial-gradient(circle at 80% 60%, rgba(0,0,0,.04), transparent 40%),
            radial-gradient(circle at 40% 85%, rgba(0,0,0,.03), transparent 45%);
    mix-blend-mode:multiply;
    z-index:0;
}

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

/* NAV */
.nav{
    position:fixed;
    inset:0;
    z-index:20;
    pointer-events:none;
}
.nav-btn{
    position:fixed;
    width:240px;
    height:80px;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;

    background: transparent;
    border:2px solid var(--ink);
    color: var(--ink);
    text-decoration:none;

    font-size:1rem;
    letter-spacing:.5px;
    user-select:none;
    cursor:pointer;

    pointer-events:auto;
    transition: transform .15s ease, background .2s ease;
}
.nav-btn:hover{
    background: rgba(0,0,0,.03);
    transform: translateY(-1px);
}

#homeBtn{ left:20px; top:20px; }
#langBtn{ right:20px; top:20px; }
#wordBtn{ left:20px; bottom:20px; }
#commBtn{ right:20px; bottom:20px; }

/* MODAL */
.modal{
    display:none;
    position:fixed; inset:0;
    background: rgba(255,255,255,.86);
    z-index:50;
}
.modal-content{
    position:relative;
    width:min(520px, 92vw);
    margin: 12vh auto 0;
    padding: 22px 18px;
    background:#fff;
    border:2px solid var(--ink);
    box-shadow: 0 10px 30px var(--shadow);
}
.modal-content h2{
    font-family: "Courier New", monospace;
    letter-spacing:2px;
    font-size: 1.4rem;
    margin-bottom: 14px;
}
.close{
    position:absolute;
    right:12px; top:10px;
    border:0;
    background:transparent;
    font-size: 30px;
    color: var(--ink);
    cursor:pointer;
}
.lang-option,.social-link{
    display:block;
    width:100%;
    padding:14px 12px;
    margin:10px 0;
    border:2px solid var(--ink);
    background:transparent;
    color:var(--ink);
    text-decoration:none;
    cursor:pointer;
    font-size:1rem;
}
.lang-option:hover,.social-link:hover{
    background: rgba(0,0,0,.03);
}

/* PAGE */
.page{
    position:relative;
    z-index:10;
    width:min(980px, 92vw);
    margin: 0 auto;
    padding: 120px 0 56px; /* 让顶部避开 nav */
}

/* HERO */
.hero{
    position:relative;
    padding: 36px 0 28px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 26px;
}
.kicker{
    font-family:"Courier New", monospace;
    letter-spacing: 4px;
    font-size: .95rem;
    color: var(--ink-soft);
    margin-bottom: 12px;
}
.title{
    position:relative;
    font-size: clamp(48px, 7vw, 92px);
    font-weight: 700;
    letter-spacing: 1px;
    line-height: 1.0;
}
.title-ghost{
    position:absolute;
    left:0; top:0;
    transform: translate(2px, 2px);
    color: rgba(0,0,0,.12);
    pointer-events:none;
    user-select:none;
}
.tagline{
    margin-top: 10px;
    color: var(--ink-soft);
}
.mono{ font-family: "Courier New", monospace; }
.lead{
    margin-top: 16px;
    max-width: 72ch;
    color: var(--ink);
    line-height: 1.7;
}
.scanline{
    position:absolute;
    left:0; right:0;
    bottom:-1px;
    height:2px;
    background: var(--ink);
    transform-origin:left center;
    transform: scaleX(0);
    opacity:.65;
}

/* SECTIONS */
.section{
    padding: 18px 0;
    border-bottom: 1px solid var(--line2);
}
.h2{
    font-family:"Courier New", monospace;
    letter-spacing: 3px;
    font-size: 1.2rem;
    text-transform: uppercase;
    margin-bottom: 10px;
}
.section p{
    line-height: 1.75;
    max-width: 78ch;
    margin-bottom: 10px;
}
.sublead{ color: var(--ink-soft); }

.quote{
    margin-top: 14px;
    padding: 14px 14px;
    border-left: 2px solid var(--ink);
    background: rgba(0,0,0,.02);
}
.quote-line{ font-size: 1rem; }
.quote-meta{ margin-top: 6px; color: var(--ink-soft); font-size: .9rem; }

/* TABLE */
.table-wrap{
    margin-top: 12px;
    overflow:auto;
    border: 2px solid var(--ink);
}
.table{
    width:100%;
    border-collapse: collapse;
    min-width: 520px;
}
.table th,.table td{
    border-bottom: 1px solid var(--line);
    padding: 12px 12px;
    text-align:left;
    vertical-align:top;
}
.table thead th{
    font-family:"Courier New", monospace;
    letter-spacing:2px;
    font-size:.95rem;
}
.table tbody tr:hover{
    background: rgba(0,0,0,.02);
}

/* CARDS GRID */
.grid{
    margin-top: 12px;
    display:grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}
.card{
    border: 2px solid var(--ink);
    padding: 14px 14px;
    background: rgba(255,255,255,.75);
}
.card-emph{
    grid-column: 1 / -1;
}
.h3{
    font-family:"Courier New", monospace;
    letter-spacing:2px;
    font-size: 1.05rem;
    margin-bottom: 8px;
    text-transform: uppercase;
}

/* FOOTER */
.footer{
    padding: 28px 0 10px;
    text-align:center;
}
.footer-line{
    height:1px;
    background: var(--line);
    margin-bottom: 16px;
}
.logo{
    width: 120px;
    height: auto;
    display:block;
    margin: 0 auto 10px;
    image-rendering: auto;
}
.footer-meta{
    color: var(--ink-soft);
    letter-spacing: 2px;
    font-size: .9rem;
}

/* REVEAL */
.reveal{
    opacity:0;
    transform: translateY(10px);
    transition: opacity .8s ease, transform .8s ease;
}
.reveal.show{
    opacity:1;
    transform: translateY(0);
}

/* responsive */
@media (max-width: 900px){
    .nav-btn{ width: 200px; height: 70px; }
}
@media (max-width: 640px){
    #homeBtn,#langBtn{ top:12px; }
    #wordBtn,#commBtn{ bottom:12px; }
    #homeBtn,#wordBtn{ left:12px; }
    #langBtn,#commBtn{ right:12px; }

    .nav-btn{ width: 160px; height: 60px; font-size:.95rem; }
    .page{ padding-top: 110px; }
    .grid{ grid-template-columns: 1fr; }
}