:root{--bg:#f5f6f8;--surface:#fff;--border:#d9dce1;--text:#1c1f24;--text-muted:#6b7280;--accent:#2f6feb;--accent-contrast:#fff;--error-bg:#fdeceb;--error-border:#e5534b;--error-text:#8a1f16;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font:16px/1.5 system-ui,Segoe UI,Roboto,sans-serif}:root[data-theme=dark]{--bg:#14161a;--surface:#1b1e24;--border:#2e333c;--text:#e6e8eb;--text-muted:#9aa1ac;--accent:#5b9dff;--accent-contrast:#0b1220;--error-bg:#3a1c1c;--error-border:#e5534b;--error-text:#ffb4ac;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}.site-header{align-items:center;gap:10px;margin-bottom:12px;display:flex}.site-header__brand{color:var(--accent);white-space:nowrap;font-size:15px;font-weight:700;text-decoration:none}.site-header__brand:hover{text-decoration:underline}.site-header__divider{color:var(--text-muted);font-weight:400}.site-header__title{color:var(--text-muted);white-space:nowrap;font-size:15px;font-weight:600}.toolbar-spacer{flex:1}.btn,.toggle-btn{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:6px;padding:6px 12px;font-size:13px}.btn:hover,.toggle-btn:hover{border-color:var(--accent)}.icon-btn{padding:6px 10px}.error-banner{background:var(--error-bg);border:1px solid var(--error-border);color:var(--error-text);border-radius:6px;margin:12px 0;padding:10px 14px;font-size:14px}.app{max-width:1100px;margin:0 auto;padding:20px 20px 48px}.app__header{margin-bottom:16px}.app__header h1{margin:0 0 4px;font-size:26px}.app__header p{color:var(--text-muted);margin:0}.controls{margin-bottom:12px}.search-input{background:var(--surface);width:100%;max-width:420px;color:var(--text);border:1px solid var(--border);border-radius:6px;padding:8px 12px;font-size:14px}.legend{flex-wrap:wrap;gap:6px;margin-bottom:16px;display:flex}.legend__item{border:1px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer;border-radius:999px;align-items:center;gap:6px;padding:4px 10px;font-size:12px;display:inline-flex}.legend__item.is-active{border-color:var(--accent);color:var(--text);font-weight:600}.legend__swatch{border-radius:50%;width:10px;height:10px;display:inline-block}.legend__swatch--all{background:linear-gradient(135deg,#f87171,#60a5fa,#4ade80)}.periodic-grid-scroll{padding-bottom:8px;overflow-x:auto}.periodic-grid{grid-template-columns:repeat(18,minmax(42px,1fr));grid-auto-rows:minmax(42px,1fr);gap:3px;min-width:900px;display:grid}.element-tile{cursor:pointer;color:#0b1220;border:none;border-radius:4px;flex-direction:column;justify-content:space-between;align-items:flex-start;padding:3px 5px;transition:transform .1s,opacity .15s;display:flex}.element-tile:hover{z-index:1;transform:scale(1.08)}.element-tile__number{opacity:.75;font-size:9px}.element-tile__symbol{font-size:15px;font-weight:700}.detail-overlay{z-index:10;background:#00000080;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.detail-card{background:var(--surface);border:1px solid var(--border);border-radius:10px;width:100%;max-width:360px;padding:24px;position:relative}.detail-card__close{color:var(--text-muted);cursor:pointer;background:0 0;border:none;font-size:16px;position:absolute;top:12px;right:12px}.detail-card__symbol{color:#0b1220;border-radius:10px;justify-content:center;align-items:center;width:64px;height:64px;margin-bottom:12px;font-size:28px;font-weight:700;display:flex}.detail-card__name{margin:0 0 2px;font-size:22px}.detail-card__category{color:var(--text-muted);margin:0 0 16px;font-size:13px}.detail-card__facts{grid-template-columns:auto 1fr;gap:8px 12px;margin:0;display:grid}.detail-card__facts dt{color:var(--text-muted);font-size:12px}.detail-card__facts dd{text-align:right;margin:0;font-family:ui-monospace,Consolas,monospace;font-size:13px}