:root {
    --bg: #060914;
    --text: #f4f7ff;
    --accent: #cf2030;
    --panel: rgba(255,255,255,0.08);
    --card-w: 150px;
    --card-h: 105px;
    --radius: 16px;
    --border-w: 2px;
    --shadow: 0 18px 45px rgba(0,0,0,0.42);
}
* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at 50% 20%, rgba(207,32,48,.22), transparent 32%), var(--bg);
    color: var(--text);
    overflow-x: hidden;
}
a { color: var(--text); }
.site-header, .site-footer {
    width: min(1180px, calc(100vw - 32px));
    margin: 0 auto;
}
.site-header {
    padding: 28px 0 10px;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: flex-end;
}
h1 { margin: 0; font-size: clamp(28px, 4vw, 52px); letter-spacing: -0.04em; }
p { line-height: 1.55; }
.site-header p { margin: 8px 0 0; opacity: .82; }
.site-main { width: min(1180px, calc(100vw - 32px)); margin: 0 auto; }
.stage-shell {
    margin-top: 16px;
    padding: 18px;
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 28px;
    background: linear-gradient(180deg, rgba(255,255,255,.11), rgba(255,255,255,.045));
    box-shadow: 0 32px 80px rgba(0,0,0,.36);
}
.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}
button {
    appearance: none;
    border: 1px solid rgba(255,255,255,.18);
    background: var(--panel);
    color: var(--text);
    padding: 10px 14px;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 700;
    transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
button:hover { transform: translateY(-1px); border-color: rgba(255,255,255,.34); }
button.primary { background: linear-gradient(135deg, var(--accent), #f05b6a); border-color: transparent; }
.stat { opacity: .78; font-size: 14px; margin-left: auto; }
.stage {
    position: relative;
    width: 100%;
    height: min(72vh, 720px);
    min-height: 520px;
    border-radius: 24px;
    overflow: hidden;
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,.12), transparent 46%), rgba(0,0,0,.18);
    perspective: var(--perspective, 1100px);
    user-select: none;
    touch-action: none;
    cursor: grab;
}
.stage.dragging { cursor: grabbing; }
.sphere {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
}
.card {
    position: absolute;
    left: 50%;
    top: 50%;
    width: var(--card-w);
    height: var(--card-h);
    margin-left: calc(var(--card-w) / -2);
    margin-top: calc(var(--card-h) / -2);
    transform-style: preserve-3d;
    border-radius: var(--radius);
    border: var(--border-w) solid rgba(255,255,255,.55);
    overflow: hidden;
    background: #111;
    box-shadow: var(--shadow);
    will-change: transform, opacity, filter;
}
.card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
}
.card.is-back img { transform: scaleX(-1); }
.card.is-back { border-color: rgba(255,255,255,.16); }
.content-box {
    margin: 24px 0;
    padding: 24px;
    border-radius: 20px;
    background: var(--panel);
}
.site-footer {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 24px 0 32px;
    opacity: .82;
    font-size: 14px;
}
.site-footer nav { display: flex; gap: 14px; }
@media (max-width: 720px) {
    .site-header { display: block; }
    .stage { min-height: 470px; height: 68vh; }
    .stat { width: 100%; margin-left: 0; }
}