/* ULID Generator — Styles */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#6366F1;--primary-hover:#818CF8;--primary-glow:rgba(99,102,241,0.15);
  --bg:#0F0F14;--bg-surface:#17171E;--bg-elevated:#222230;
  --border:rgba(99,102,241,0.12);--border-focus:rgba(99,102,241,0.4);
  --text:#E2E8F0;--text-muted:#94A3B8;--text-dim:#475569;
  --success:#22C55E;--accent:#F59E0B;
  --radius:10px;--radius-sm:6px;--transition:200ms ease;
  --sans:'Inter',system-ui,sans-serif;--mono:'JetBrains Mono',monospace;
}
[data-theme="light"]{
  --bg:#F8FAFC;--bg-surface:#FFFFFF;--bg-elevated:#F1F5F9;
  --border:rgba(0,0,0,0.08);--text:#1E293B;--text-muted:#64748B;--text-dim:#CBD5E1;
}
html{font-size:16px;-webkit-font-smoothing:antialiased}
body{font-family:var(--sans);background:var(--bg);color:var(--text);min-height:100vh;display:flex;flex-direction:column;line-height:1.5}

.header{background:var(--bg-surface);border-bottom:1px solid var(--border);padding:0.75rem 1.5rem}
.header-inner{max-width:700px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:1.1rem;font-weight:700}
.icon-btn{font-size:1.1rem;width:36px;height:36px;border:1px solid var(--border);border-radius:var(--radius-sm);background:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:border-color var(--transition)}
.icon-btn:hover{border-color:var(--primary)}

.main{flex:1;padding:1.25rem;max-width:700px;margin:0 auto;width:100%;display:flex;flex-direction:column;gap:1rem}

.panel{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.panel-header{padding:0.6rem 1rem;border-bottom:1px solid var(--border);background:var(--bg-elevated)}
.panel-header h2{font-size:0.8rem;font-weight:600;text-transform:uppercase;letter-spacing:0.04em;color:var(--text-muted)}

.gen-row{display:flex;align-items:center;gap:0.5rem;padding:1rem}
.ulid-display{font-family:var(--mono);font-size:1.15rem;font-weight:600;color:var(--primary);flex:1;letter-spacing:0.04em;word-break:break-all}
.primary-btn{display:block;width:calc(100% - 2rem);margin:0 1rem 1rem;font-family:var(--sans);font-size:0.88rem;font-weight:600;padding:0.65rem;border:none;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--primary),#A78BFA);color:#fff;cursor:pointer;transition:all var(--transition)}
.primary-btn:hover{transform:translateY(-1px);box-shadow:0 4px 16px var(--primary-glow)}
.secondary-btn{font-family:var(--sans);font-size:0.82rem;font-weight:500;padding:0.45rem 0.85rem;border:1px solid var(--border);border-radius:var(--radius-sm);background:none;color:var(--text-muted);cursor:pointer;transition:all var(--transition)}
.secondary-btn:hover{border-color:var(--primary);color:var(--primary)}
.small-btn{font-family:var(--sans);font-size:0.78rem;padding:0.3rem 0.55rem;border:1px solid var(--border);border-radius:4px;background:none;color:var(--text-dim);cursor:pointer;transition:all var(--transition)}
.small-btn:hover{border-color:var(--primary);color:var(--primary)}

.batch-row{display:flex;align-items:center;gap:0.5rem;padding:0.75rem 1rem;flex-wrap:wrap}
.batch-row label{font-size:0.8rem;color:var(--text-muted);font-weight:500}
.batch-row input[type="number"]{font-family:var(--mono);font-size:0.85rem;width:70px;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:0.4rem 0.5rem;text-align:center}
.batch-row input:focus{outline:none;border-color:var(--border-focus)}
.batch-output{font-family:var(--mono);font-size:0.8rem;padding:0.75rem 1rem;margin:0;max-height:200px;overflow:auto;color:var(--text-muted);white-space:pre;line-height:1.6}

.decode-input{font-family:var(--mono);font-size:0.85rem;width:100%;background:var(--bg);color:var(--text);border:none;border-bottom:1px solid var(--border);padding:0.75rem 1rem}
.decode-input:focus{outline:none;background:var(--bg-elevated)}
.decode-output{padding:0.75rem 1rem;font-size:0.82rem;line-height:1.6}
.decode-row{display:flex;justify-content:space-between;padding:0.2rem 0;border-bottom:1px solid var(--border)}
.decode-row:last-child{border:none}
.decode-key{font-weight:600;color:var(--text-dim);font-family:var(--mono);font-size:0.78rem}
.decode-val{color:var(--text);font-family:var(--mono);font-size:0.78rem}

.explain{padding:1rem}
.explain-diagram{font-family:var(--mono);font-size:1.1rem;font-weight:600;margin-bottom:0.25rem}
.ts-part{color:var(--accent)}
.rand-part{color:var(--primary)}
.explain-labels{font-size:0.72rem;color:var(--text-dim);display:flex;justify-content:space-between;margin-bottom:0.75rem}
.explain-list{font-size:0.82rem;color:var(--text-muted);padding-left:1.25rem;line-height:1.8}

.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%) translateY(20px);background:var(--bg-elevated);color:var(--text);padding:0.6rem 1.25rem;border-radius:var(--radius);border:1px solid var(--border);font-size:0.82rem;font-weight:500;box-shadow:0 8px 32px rgba(0,0,0,0.4);opacity:0;pointer-events:none;transition:all 300ms ease;z-index:999}
.toast.visible{opacity:1;transform:translateX(-50%) translateY(0)}

.footer{text-align:center;padding:0.75rem 1.5rem;border-top:1px solid var(--border);color:var(--text-dim);font-size:0.75rem}
.hidden{display:none!important}
@media(max-width:500px){.batch-row{flex-direction:column;align-items:stretch} .gen-row{flex-direction:column;text-align:center}}