:root{--bg:#0a0a0f;--surface:#141420;--border:#2a2a3a;--text:#e8e8f0;--text2:#888898;--accent:#f59e0b;--accent2:#ff6b35;--green:#22c55e;--red:#ef4444;--blue:#3b82f6}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.login-page{justify-content:center;align-items:center;min-height:100vh;padding:1rem;display:flex}.login-form{background:var(--surface);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:1rem;width:100%;max-width:380px;padding:2.5rem 2rem;display:flex}.login-form h1{text-align:center;font-size:1.8rem}.login-form .subtitle{text-align:center;color:var(--text2);margin-top:-.5rem;font-size:.9rem}.login-form input{background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:8px;outline:none;padding:.75rem 1rem;font-size:1rem;transition:border-color .2s}.login-form input:focus{border-color:var(--accent)}.login-form button{background:var(--accent);color:#000;cursor:pointer;border:none;border-radius:8px;padding:.75rem;font-size:1rem;font-weight:600;transition:opacity .2s}.login-form button:hover{opacity:.9}.login-form button:disabled{opacity:.5}.error{border:1px solid var(--red);color:var(--red);background:#ef444426;border-radius:8px;padding:.5rem .75rem;font-size:.85rem}.dashboard{max-width:1200px;margin:0 auto;padding:1rem 1.5rem}header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding:1rem 0;display:flex}.header-left h1{font-size:1.5rem}.stats{color:var(--text2);font-size:.85rem}.logout{border:1px solid var(--border);color:var(--text2);cursor:pointer;background:0 0;border-radius:6px;padding:.4rem 1rem;font-size:.85rem;transition:border-color .2s}.logout:hover{border-color:var(--text);color:var(--text)}.sensors-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem;margin-bottom:2rem;display:grid}.empty{color:var(--text2);text-align:center;grid-column:1/-1;padding:3rem}.sensor-card{background:var(--surface);border:1px solid var(--border);cursor:pointer;border-radius:12px;padding:1.25rem;transition:border-color .2s,transform .1s}.sensor-card:hover{border-color:var(--accent);transform:translateY(-1px)}.sensor-card.active{border-color:var(--accent);box-shadow:0 0 20px #f59e0b26}.sensor-card.stale{opacity:.6}.card-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.card-label{font-size:.95rem;font-weight:600}.status-dot{border-radius:50%;width:8px;height:8px}.status-dot.online{background:var(--green);box-shadow:0 0 8px #22c55e80}.status-dot.offline{background:var(--red)}.card-values{gap:1.5rem;margin-bottom:.75rem;display:flex}.val .num{font-size:2rem;font-weight:700;line-height:1}.val .unit{color:var(--text2);margin-left:2px;font-size:.9rem}.val.temp .num{color:var(--accent2)}.val.humi .num{color:var(--blue)}.card-meta{color:var(--text2);gap:.75rem;font-size:.8rem;display:flex}.chart-section{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.25rem}.chart-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.chart-header h2{font-size:1.1rem;font-weight:600}.time-range{gap:.25rem;display:flex}.time-range button{background:var(--bg);border:1px solid var(--border);color:var(--text2);cursor:pointer;border-radius:6px;padding:.3rem .6rem;font-size:.8rem}.time-range button.active{background:var(--accent);color:#000;border-color:var(--accent)}.chart-container{width:100%;height:300px}.chart-canvas{width:100%;height:100%}@media (width<=600px){.dashboard{padding:.75rem}.sensors-grid{grid-template-columns:1fr}.chart-container{height:220px}.val .num{font-size:1.5rem}}