*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
    --bg:#0a0a0f;
    --surface:#12121a;
    --surface2:#1a1a26;
    --border:#ffffff10;
    --text:#e4e4e7;
    --text-dim:#a1a1aa;
    --accent:#6366f1;
    --accent-light:#818cf8;
    --accent-glow:#6366f140;
    --green:#22c55e;
    --blue:#3b82f6;
    --purple:#a855f7;
}
html{scroll-behavior:smooth}
body{
    font-family:"Segoe UI","Hiragino Sans","Noto Sans JP","Microsoft YaHei",sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.7;
    overflow-x:hidden;
}

/* ── Nav ── */
nav{
    position:fixed;top:0;left:0;right:0;z-index:100;
    background:rgba(10,10,15,.8);
    backdrop-filter:blur(20px);
    border-bottom:1px solid var(--border);
}
.nav-inner{
    max-width:1100px;margin:0 auto;padding:0 32px;
    display:flex;align-items:center;justify-content:space-between;height:64px;
}
.nav-logo{font-size:18px;font-weight:700;color:#fff;text-decoration:none}
.nav-logo span{color:var(--accent-light)}
.nav-links{display:flex;gap:32px;list-style:none;align-items:center}
.nav-links a{color:var(--text-dim);text-decoration:none;font-size:14px;transition:color .2s}
.nav-links a:hover{color:#fff}
.lang-switch{display:flex;gap:4px;margin-left:16px;padding-left:16px;border-left:1px solid var(--border)}
.lang-switch a{
    padding:4px 10px;border-radius:6px;font-size:12px;font-weight:600;
    color:var(--text-dim);text-decoration:none;transition:all .2s;
}
.lang-switch a:hover{color:#fff;background:var(--surface2)}
.lang-switch a.active{color:var(--accent-light);background:var(--accent-glow)}

/* ── Hero ── */
.hero{
    min-height:100vh;display:flex;align-items:center;justify-content:center;
    text-align:center;padding:120px 32px 80px;
    position:relative;
}
.hero::before{
    content:"";position:absolute;top:-200px;left:50%;transform:translateX(-50%);
    width:800px;height:800px;
    background:radial-gradient(circle,var(--accent-glow) 0%,transparent 70%);
    pointer-events:none;
}
.hero-content{position:relative;max-width:800px}
.hero-badge{
    display:inline-flex;align-items:center;gap:8px;
    padding:6px 16px;border-radius:100px;
    background:var(--surface2);border:1px solid var(--border);
    font-size:13px;color:var(--accent-light);margin-bottom:32px;
}
.hero-badge::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--green);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{font-size:clamp(36px,5vw,64px);font-weight:800;line-height:1.15;letter-spacing:-.02em;margin-bottom:24px}
.hero h1 .gradient{
    background:linear-gradient(135deg,var(--accent-light),var(--purple));
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.hero p{font-size:18px;color:var(--text-dim);max-width:560px;margin:0 auto 48px}
.hero-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ── Buttons ── */
.btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:14px 32px;border-radius:12px;font-size:15px;font-weight:600;
    text-decoration:none;transition:all .25s;cursor:pointer;border:none;
}
.btn-primary{
    background:linear-gradient(135deg,var(--accent),var(--purple));color:#fff;
    box-shadow:0 4px 24px var(--accent-glow);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px var(--accent-glow)}
.btn-ghost{
    background:var(--surface2);color:var(--text);border:1px solid var(--border);
}
.btn-ghost:hover{background:var(--surface);border-color:var(--accent);color:#fff}

/* ── Section ── */
section{padding:100px 32px}
.section-inner{max-width:1100px;margin:0 auto}
.section-label{
    display:inline-block;font-size:13px;font-weight:600;text-transform:uppercase;
    letter-spacing:.1em;color:var(--accent-light);margin-bottom:12px;
}
.section-title{font-size:clamp(28px,3.5vw,42px);font-weight:700;margin-bottom:20px;line-height:1.25}
.section-desc{font-size:16px;color:var(--text-dim);max-width:600px;margin-bottom:56px}

/* ── Features grid ── */
.features-grid{
    display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;
}
.feature-card{
    background:var(--surface);border:1px solid var(--border);
    border-radius:16px;padding:32px;transition:all .3s;
}
.feature-card:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,0,0,.4)}
.feature-icon{
    width:48px;height:48px;border-radius:12px;
    display:flex;align-items:center;justify-content:center;
    font-size:22px;margin-bottom:20px;
}
.feature-icon.blue{background:rgba(59,130,246,.15);color:var(--blue)}
.feature-icon.green{background:rgba(34,197,94,.15);color:var(--green)}
.feature-icon.purple{background:rgba(168,85,247,.15);color:var(--purple)}
.feature-card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-dim);line-height:1.7}

/* ── Problem / Solution ── */
.problem-section{background:var(--surface)}
.ps-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.ps-visual{
    background:var(--surface2);border:1px solid var(--border);
    border-radius:20px;padding:40px;text-align:center;
}
.ps-visual .monitor{
    display:inline-block;border:2px solid var(--border);
    border-radius:8px;padding:20px 32px;margin:8px;font-size:13px;
    background:var(--bg);
}
.ps-visual .monitor.active{border-color:var(--green);box-shadow:0 0 20px rgba(34,197,94,.2)}
.ps-visual .monitor.minimized{opacity:.35;border-style:dashed}
.ps-visual .label{font-size:12px;color:var(--text-dim);margin-top:12px}

/* ── Use cases ── */
.usecases{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.usecase{
    background:var(--surface);border:1px solid var(--border);
    border-radius:16px;padding:28px;position:relative;overflow:hidden;
}
.usecase::before{
    content:"";position:absolute;top:0;left:0;right:0;height:3px;
    background:linear-gradient(90deg,var(--accent),var(--purple));
}
.usecase h3{font-size:16px;font-weight:600;margin-bottom:8px}
.usecase p{font-size:14px;color:var(--text-dim)}
.usecase .tag{
    display:inline-block;margin-top:12px;padding:4px 10px;border-radius:6px;
    font-size:11px;font-weight:600;background:var(--accent-glow);color:var(--accent-light);
}

/* ── Steps ── */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;counter-reset:step}
.step{
    text-align:center;padding:32px 24px;
    background:var(--surface);border:1px solid var(--border);border-radius:16px;
    counter-increment:step;position:relative;
}
.step::before{
    content:counter(step);display:flex;align-items:center;justify-content:center;
    width:40px;height:40px;border-radius:50%;margin:0 auto 20px;
    background:linear-gradient(135deg,var(--accent),var(--purple));
    font-size:16px;font-weight:700;color:#fff;
}
.step h3{font-size:16px;font-weight:600;margin-bottom:8px}
.step p{font-size:14px;color:var(--text-dim)}

/* ── Display Image ── */
.display-image-section{background:var(--surface)}
.display-image-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.display-image-text h2{margin-bottom:16px}
.display-image-text p{color:var(--text-dim);font-size:15px;line-height:1.8}
.display-image-text .highlight{color:var(--accent-light);font-weight:600}
.win-display-settings{
    background:#e8e8e8;border-radius:12px;
    padding:24px;
    position:relative;
    box-shadow:0 8px 32px rgba(0,0,0,.3);
}
.win-display-settings .win-title{
    font-size:11px;color:#666;margin-bottom:16px;font-weight:600;letter-spacing:.02em;
}
.win-monitors{
    position:relative;width:100%;padding-bottom:46%;
}
.win-monitor{
    display:flex;align-items:center;justify-content:center;
    border-radius:4px;font-weight:700;position:absolute;
    transition:all .3s;
}
.win-monitor-1{
    width:37%;height:72%;
    background:#0078d4;color:#fff;font-size:clamp(18px,2.5vw,28px);
    top:0;left:0;
    border:2px solid #005a9e;
}
.win-monitor-2{
    width:42%;height:58%;
    background:#d0d0d0;color:#444;font-size:clamp(18px,2.5vw,28px);
    top:14%;left:38%;
    border:2px solid #b0b0b0;
}
.win-monitor-3{
    width:16%;height:35%;
    background:#c8c8c8;color:#333;font-size:clamp(12px,1.5vw,18px);
    top:0;left:81%;
    border:2px solid #a0a0a0;
    animation:vmon-glow 2.5s ease-in-out infinite;
}
@keyframes vmon-glow{
    0%,100%{box-shadow:0 0 0 0 rgba(99,102,241,0)}
    50%{box-shadow:0 0 16px 4px rgba(99,102,241,.5)}
}
.win-monitor-label{
    position:absolute;bottom:-22px;font-size:clamp(9px,1vw,11px);color:#888;
    white-space:nowrap;text-align:center;width:100%;left:0;
}
.win-monitor-3 .win-monitor-label{color:var(--accent-light);font-weight:600}

/* ── Preview callout ── */
.preview-callout{
    margin-top:24px;padding:20px 24px;
    background:var(--surface2);border:1px solid var(--accent);
    border-radius:12px;position:relative;
}
.preview-callout::before{
    content:"";position:absolute;top:-1px;left:0;right:0;height:3px;
    background:linear-gradient(90deg,var(--accent),var(--purple));border-radius:12px 12px 0 0;
}
.preview-callout-header{
    display:flex;align-items:center;gap:10px;margin-bottom:8px;
}
.preview-callout-icon{
    width:32px;height:32px;border-radius:8px;
    background:rgba(99,102,241,.15);
    display:flex;align-items:center;justify-content:center;
    font-size:16px;flex-shrink:0;
}
.preview-callout-header h3{font-size:15px;font-weight:600;color:var(--accent-light)}
.preview-callout p{font-size:13px;color:var(--text-dim);line-height:1.7}
.preview-callout strong{color:var(--text)}

/* ── CTA ── */
.cta{text-align:center;padding:120px 32px;position:relative}
.cta::before{
    content:"";position:absolute;bottom:-100px;left:50%;transform:translateX(-50%);
    width:600px;height:600px;
    background:radial-gradient(circle,rgba(168,85,247,.12) 0%,transparent 70%);
    pointer-events:none;
}
.cta .section-title{max-width:600px;margin:0 auto 20px}
.cta p{color:var(--text-dim);margin-bottom:40px;font-size:16px}

/* ── Footer ── */
footer{
    border-top:1px solid var(--border);padding:40px 32px;text-align:center;
    font-size:13px;color:var(--text-dim);
}

/* ── Responsive ── */
@media(max-width:768px){
    .ps-grid{grid-template-columns:1fr}
    .display-image-grid{grid-template-columns:1fr}
    .steps{grid-template-columns:1fr}
    .nav-links{display:none}
}