*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#0984E3;--primary-light:#74B9FF;--accent:#2ECC71;--accent-light:#55EFC4;
  --bg:#0D1117;--bg-surface:#161B22;--bg-card:#1C2333;--bg-elevated:#21293A;
  --text:#E6EDF3;--text-secondary:#8B949E;--text-muted:#484F58;
  --border:rgba(9,132,227,0.15);--border-accent:rgba(9,132,227,0.35);
  --success:#2ECC71;--warning:#FDCB6E;--error:#E74C3C;
  --radius:10px;--transition:0.2s ease;
  --overlap:rgba(46,204,113,0.15);--overlap-accent:rgba(46,204,113,0.3);
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}
.app{max-width:1000px;margin:0 auto;padding:2rem 1.5rem;min-height:100vh;display:flex;flex-direction:column}
.header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:0.75rem}
.logo{display:flex;align-items:center;gap:0.75rem}
.logo h1{font-size:1.4rem;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.header-actions{display:flex;gap:0.375rem}
.btn{padding:0.625rem 1.125rem;border:none;border-radius:8px;font-family:inherit;font-size:0.8125rem;font-weight:600;cursor:pointer;transition:all var(--transition);display:inline-flex;align-items:center;gap:0.375rem}
.btn-primary{background:linear-gradient(135deg,var(--primary),#0870C4);color:#fff;box-shadow:0 2px 12px rgba(9,132,227,0.35)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 20px rgba(9,132,227,0.5)}
.btn-sm{padding:0.5rem 0.875rem;background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);border-radius:8px}
.btn-sm:hover{border-color:var(--primary);color:var(--text)}
.btn-preset{padding:0.375rem 0.75rem;background:var(--bg-elevated);border:1px solid var(--border);color:var(--text-secondary);border-radius:6px;font-size:0.75rem}
.btn-preset:hover{border-color:var(--primary);color:var(--text)}
.add-section{margin-bottom:1.25rem}
.add-row{display:flex;gap:0.5rem;margin-bottom:0.625rem;flex-wrap:wrap}
.add-row input[type="text"]{flex:1;min-width:120px;padding:0.625rem 0.875rem;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:inherit;font-size:0.875rem}
.add-row input:focus,.add-row select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(9,132,227,0.12)}
.add-row select{padding:0.625rem 2rem 0.625rem 0.75rem;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:inherit;font-size:0.8125rem;min-width:200px;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238B949E' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 0.625rem center}
.add-row input[type="time"]{padding:0.5rem;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:'JetBrains Mono',monospace;font-size:0.8125rem}
.time-sep{color:var(--text-muted);display:flex;align-items:center;font-weight:600}
.presets{display:flex;gap:0.375rem;align-items:center;flex-wrap:wrap}
.preset-label{font-size:0.75rem;color:var(--text-muted);font-weight:600}
.team-list{display:flex;flex-direction:column;gap:0.5rem;margin-bottom:1.5rem}
.member-card{display:flex;align-items:center;gap:0.75rem;padding:0.75rem 1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);transition:all var(--transition)}
.member-card:hover{border-color:var(--border-accent)}
.member-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:700;color:#fff;flex-shrink:0}
.member-info{flex:1;min-width:0}
.member-name{font-weight:600;font-size:0.875rem}
.member-tz{font-size:0.75rem;color:var(--text-secondary);font-family:'JetBrains Mono',monospace}
.member-time{font-family:'JetBrains Mono',monospace;font-size:1rem;font-weight:700;min-width:70px;text-align:right}
.member-time.online{color:var(--accent)}
.member-time.offline{color:var(--text-muted)}
.online-dot{width:8px;height:8px;border-radius:50%;margin-left:0.5rem;flex-shrink:0}
.online-dot.on{background:var(--accent);box-shadow:0 0 6px var(--accent)}
.online-dot.off{background:var(--text-muted)}
.member-remove{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:0.25rem;font-size:1.125rem;transition:color var(--transition)}
.member-remove:hover{color:var(--error)}
.timeline-section h2{font-size:1rem;font-weight:700;margin-bottom:0.75rem;display:flex;align-items:center;gap:0.5rem}
.timezone-note{font-size:0.75rem;color:var(--text-muted);font-weight:500}
.timeline-grid{display:flex;flex-direction:column;gap:0.375rem;overflow-x:auto;padding-bottom:0.5rem}
.tl-row{display:flex;align-items:center;gap:0.5rem}
.tl-label{width:100px;font-size:0.75rem;font-weight:600;flex-shrink:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tl-bar{display:flex;flex:1;height:28px;border-radius:4px;overflow:hidden;background:var(--bg-elevated);position:relative}
.tl-hour{flex:1;border-right:1px solid rgba(255,255,255,0.03);position:relative}
.tl-hour.work{background:rgba(9,132,227,0.2)}
.tl-hour.overlap{background:var(--overlap)}
.tl-hours-labels{display:flex;flex:1;margin-left:100px;padding-left:0.5rem}
.tl-hours-labels span{flex:1;text-align:center;font-size:0.6rem;color:var(--text-muted);font-family:'JetBrains Mono',monospace}
.best-slot{margin-bottom:1rem}
.slot-card{display:flex;align-items:center;gap:1rem;padding:1rem 1.25rem;background:linear-gradient(135deg,rgba(46,204,113,0.08),rgba(9,132,227,0.08));border:1px solid var(--overlap-accent);border-radius:var(--radius)}
.slot-icon{font-size:1.5rem}
.slot-body h3{font-size:0.875rem;font-weight:700;margin-bottom:0.25rem}
.slot-time{font-family:'JetBrains Mono',monospace;font-size:1.125rem;font-weight:700;color:var(--accent)}
.slot-detail{font-size:0.75rem;color:var(--text-secondary);margin-top:0.25rem}
.dst-warning{display:flex;align-items:center;gap:0.5rem;padding:0.75rem 1rem;background:rgba(253,203,110,0.08);border:1px solid rgba(253,203,110,0.25);border-radius:8px;color:var(--warning);font-size:0.8125rem;margin-bottom:1rem}
.dst-warning.hidden{display:none}
.hidden{display:none!important}
.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%) translateY(100px);background:var(--bg-card);border:1px solid var(--border-accent);border-radius:8px;padding:0.75rem 1.5rem;font-size:0.875rem;font-weight:500;box-shadow:0 8px 30px rgba(0,0,0,0.5);z-index:100;transition:transform 0.3s cubic-bezier(0.34,1.56,0.64,1);pointer-events:none}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast.hidden{display:block;transform:translateX(-50%) translateY(100px)}
.footer{margin-top:auto;padding-top:2rem;text-align:center;font-size:0.75rem;color:var(--text-muted)}
@media(max-width:768px){
  .add-row{flex-direction:column}
  .add-row input[type="text"],.add-row select{min-width:100%}
  .tl-label{width:70px;font-size:0.625rem}
  .member-time{font-size:0.875rem}
}