:root {
  --primary: #64748B; --primary-hover: #475569; --secondary: #94A3B8;
  --accent: #F59E0B; --success: #10B981; --error: #EF4444;
  --bg: #0F1117; --bg-elevated: #15181F; --bg-card: #1C2028;
  --bg-input: #12141A; --text: #E2E8F0; --text-muted: #94A3B8; --text-dim: #4B5563;
  --border: #1F2937; --border-hover: #374151; --radius: 12px; --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif; --mono: monospace; --transition: 200ms ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;overflow:hidden}
.app{display:flex;flex-direction:column;height:100vh}

.header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--bg-elevated);border-bottom:1px solid var(--border);gap:12px;flex-shrink:0}
.header-left{display:flex;align-items:center;gap:12px}
.logo{font-size:1.3rem}
.header-title{font-size:1.05rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.header-right{display:flex;gap:8px}

.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;font-size:.8rem;font-weight:500;font-family:var(--font);border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);white-space:nowrap}
.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--bg-card);color:var(--text);border-color:var(--border-hover)}
.btn-sm{padding:5px 10px;font-size:.72rem}
.btn-xs{padding:2px 6px;font-size:.6rem}

.main{flex:1;display:flex;flex-direction:column;overflow:hidden}
.input-section{padding:12px 16px;display:flex;flex-direction:column;gap:6px;flex-shrink:0}
.input-area{width:100%;padding:12px;font-family:var(--mono);font-size:.9rem;line-height:1.5;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);resize:none;outline:none;min-height:60px;max-height:120px}
.input-area:focus{border-color:var(--primary)}
.stats-bar{display:flex;gap:14px;font-size:.68rem;color:var(--text-dim)}
.stat{display:flex;align-items:center;gap:4px}
.stat-accent{color:var(--accent);font-weight:600}

.results{flex:1;overflow-y:auto;padding:0 16px 16px;display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:6px;align-content:start}
.char-card{padding:10px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);display:flex;flex-direction:column;gap:4px;cursor:pointer;transition:all var(--transition)}
.char-card:hover{border-color:var(--primary);transform:translateY(-1px)}
.char-card.invisible{border-color:var(--error);background:rgba(239,68,68,.04)}
.char-card.non-ascii{border-color:var(--accent);background:rgba(245,158,11,.04)}
.char-display{font-size:1.6rem;font-family:var(--mono);text-align:center;min-height:2rem;display:flex;align-items:center;justify-content:center}
.char-display.invisible-char{background:rgba(239,68,68,.12);border-radius:4px;font-size:.7rem;color:var(--error);font-family:var(--font)}
.char-codepoint{font-size:.65rem;font-family:var(--mono);color:var(--secondary);text-align:center}
.char-name{font-size:.6rem;color:var(--text-dim);text-align:center;text-transform:uppercase;letter-spacing:.3px}
.char-tags{display:flex;gap:3px;justify-content:center;flex-wrap:wrap}
.tag{font-size:.55rem;padding:1px 5px;border-radius:3px;font-weight:600}
.tag-invisible{background:rgba(239,68,68,.15);color:var(--error)}
.tag-nonascii{background:rgba(245,158,11,.15);color:var(--accent)}
.tag-bidi{background:rgba(139,92,246,.15);color:#8B5CF6}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);padding:10px 20px;background:var(--bg-card);border:1px solid var(--primary);border-radius:var(--radius-sm);color:var(--secondary);font-size:.8rem;font-weight:500;z-index:200;animation:toast-in .3s ease}
@keyframes toast-in{from{opacity:0;transform:translateX(-50%) translateY(10px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}
::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
@media(max-width:768px){.results{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}}