:root {
  --primary: #84CC16; --primary-hover: #65A30D; --secondary: #A3E635;
  --accent: #E879F9; --success: #84CC16; --error: #EF4444;
  --bg: #0A1A08; --bg-elevated: #0F250D; --bg-card: #152E12;
  --bg-input: #0C1F0A; --text: #E8F5E0; --text-muted: #90C080; --text-dim: #506840;
  --border: #1E3D18; --border-hover: #2D5A24; --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-primary{background:linear-gradient(135deg,var(--primary),var(--primary-hover));color:#0A1A08;font-weight:700;box-shadow:0 2px 8px rgba(132,204,22,.3)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(132,204,22,.4)}
.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:3px 8px;font-size:.65rem}

.main{display:grid;grid-template-columns:320px 1fr;flex:1;overflow:hidden}

.timer-section{display:flex;flex-direction:column;align-items:center;gap:16px;padding:24px 16px;background:var(--bg-elevated);border-right:1px solid var(--border);overflow-y:auto}
.timer-ring{width:200px;height:200px;border-radius:50%;background:conic-gradient(var(--primary) 0%,var(--bg-card) 0%);display:flex;align-items:center;justify-content:center;transition:background .5s ease}
.timer-inner{width:180px;height:180px;border-radius:50%;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center}
.timer-display{font-size:2.4rem;font-weight:800;font-family:var(--mono);color:var(--secondary)}
.timer-label{font-size:.72rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:2px}
.timer-controls{display:flex;gap:8px}
.timer-settings{display:grid;grid-template-columns:1fr 1fr;gap:8px;width:100%}
.timer-settings .form-group:last-child{grid-column:span 2}
.form-group{display:flex;flex-direction:column;gap:3px}
.form-group label{font-size:.68rem;font-weight:500;color:var(--text-dim)}
.input{padding:8px 10px;font-size:.78rem;font-family:var(--font);background:var(--bg-input);border:1px solid var(--border);border-radius:6px;color:var(--text);outline:none;width:100%}
.input:focus{border-color:var(--primary)}
.input-sm{padding:6px 8px;font-size:.72rem}
.distraction-counter{display:flex;align-items:center;gap:8px;padding:8px 12px;background:var(--bg-card);border-radius:var(--radius-sm);border:1px solid var(--border);width:100%}
.distraction-label{font-size:.72rem;color:var(--text-muted);flex:1}
.distraction-val{font-size:.85rem;font-weight:700;color:var(--accent)}

.analytics{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:14px}
.stats-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}
.stat-card{padding:10px 12px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);text-align:center}
.stat-value{font-size:1.2rem;font-weight:700;color:var(--secondary);font-family:var(--mono)}
.stat-label{font-size:.65rem;color:var(--text-dim)}
.section{display:flex;flex-direction:column;gap:8px}
.section-title{font-size:.82rem;font-weight:600}

.heatmap{display:grid;grid-template-columns:repeat(7,1fr);gap:3px}
.heatmap-cell{aspect-ratio:1;border-radius:3px;background:var(--bg-input);position:relative}
.heatmap-cell[data-level="1"]{background:rgba(132,204,22,.2)}
.heatmap-cell[data-level="2"]{background:rgba(132,204,22,.4)}
.heatmap-cell[data-level="3"]{background:rgba(132,204,22,.6)}
.heatmap-cell[data-level="4"]{background:rgba(132,204,22,.8)}

.sessions-list{display:flex;flex-direction:column;gap:4px;max-height:200px;overflow-y:auto}
.session-row{display:grid;grid-template-columns:90px 50px 80px 1fr 40px;gap:8px;padding:6px 10px;background:var(--bg-card);border-radius:4px;font-size:.7rem;align-items:center}
.session-date{color:var(--text-dim)}.session-dur{color:var(--secondary);font-weight:600}
.session-type{font-size:.6rem;padding:2px 6px;border-radius:3px;text-align:center}
.session-type.focus{background:rgba(132,204,22,.15);color:var(--primary)}
.session-type.break{background:rgba(232,121,249,.15);color:var(--accent)}
.session-cat{color:var(--text-muted)}.session-dist{color:var(--accent);text-align:center}

.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(--primary);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){.main{grid-template-columns:1fr;grid-template-rows:auto 1fr}.timer-section{border-right:none;border-bottom:1px solid var(--border);padding:16px}.timer-ring{width:140px;height:140px}.timer-inner{width:124px;height:124px}.timer-display{font-size:1.6rem}}