:root{
  --bg: #f6faf7;
  --card: #ffffff;
  --text: #222;
  --muted: #666;
  --brand1: #4caf50;
  --brand2: #45a049;
  --accent: #e7f3e7;
  --border:#e6e6e6;
}
.dark{
  --bg: #0e1113;
  --card:#181c1f;
  --text:#e9eef2;
  --muted:#a9b6c1;
  --brand1:#66d17a;
  --brand2:#45bb65;
  --accent:#142b19;
  --border:#253039;
}
html,body{height:100%}
body{font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;margin:0;background:var(--bg);color:var(--text)}
.mt-10{margin-top:10px}
.row-gap{display:flex;gap:8px;flex-wrap:wrap}
.time-large{font-size:2rem;font-weight:700}
header{background:linear-gradient(90deg,var(--brand1),var(--brand2));color:#fff;text-align:center;padding:28px 16px;position:sticky;top:0;z-index:10;box-shadow:0 6px 18px rgba(0,0,0,.15)}
.header-row{max-width:1100px;margin:0 auto;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px}
.logo{width:36px;height:36px;border-radius:10px;background:#fff3;display:grid;place-items:center;font-weight:800}
.titlebox{text-align:left}
nav{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;padding:10px}
nav button{background:var(--card);color:var(--text);border:1px solid var(--border);border-radius:999px;padding:8px 12px;cursor:pointer;font-weight:600}
nav button:hover{border-color:var(--brand1);color:var(--brand1)}
.container{max-width:1000px;margin:18px auto;padding:0 14px}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;box-shadow:0 6px 20px rgba(0,0,0,.06)}
section{margin:18px 0}
h2{color:var(--brand1);margin:0 0 10px}
.muted{color:var(--muted)}
.view{display:none}
.view.active{display:block}
.tip{background:var(--accent);border-left:5px solid var(--brand1);padding:12px;border-radius:8px}
input,select,textarea,button{font:inherit}
label{font-weight:600;margin-top:10px;display:block}
input,select,textarea{width:100%;margin-top:6px;padding:10px;border:1px solid var(--border);border-radius:10px;background:transparent;color:var(--text)}
textarea{min-height:90px;resize:vertical}
.btn{display:inline-flex;align-items:center;gap:8px;margin-top:12px;background:linear-gradient(90deg,var(--brand1),var(--brand2));color:#fff;border:none;border-radius:10px;padding:10px 14px;cursor:pointer}
.btn.secondary{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn.warn{background:linear-gradient(90deg,#f44336,#ff7043)}
.grid{display:grid;gap:12px}
@media (min-width:760px){.grid.two{grid-template-columns:1fr 1fr}.grid.three{grid-template-columns: repeat(3,1fr)}}
.calendar{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}
.day{user-select:none;border:1px solid var(--border);background:var(--card);border-radius:10px;padding:12px;text-align:center;cursor:pointer;transition:transform .08s ease}
.day:hover{transform:scale(1.03)}
.day.selected{background:var(--brand1);color:#fff;border-color:transparent}
.workout-display ul{list-style:none;padding:0;margin:0}
.workout-display li{padding:8px 0;border-bottom:1px dashed var(--border)}
#sleep-history,#mood-history,#nutrition-entries,#steps-history{list-style:none;padding:0;margin:0}
#sleep-history li,#mood-history li,#steps-history li{border:1px solid var(--border);background:var(--card);border-radius:10px;padding:10px;margin:8px 0}
table{width:100%;border-collapse:collapse}
th,td{border-bottom:1px solid var(--border);padding:10px;text-align:left}
th{color:var(--muted);font-weight:700}
.share-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
/* Chat widget */
#nx-chat-fab{position:fixed;right:16px;bottom:16px;width:56px;height:56px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(90deg,var(--brand1),var(--brand2));color:#fff;font-size:22px;cursor:pointer;box-shadow:0 10px 24px rgba(0,0,0,.3);z-index:9999}
#nx-chat-panel{position:fixed;right:16px;bottom:84px;width:320px;max-height:70vh;display:none;flex-direction:column;background:var(--card);color:var(--text);border:1px solid var(--border);border-radius:14px;overflow:hidden;z-index:9999;box-shadow:0 16px 36px rgba(0,0,0,.35)}
.nx-chat-header{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:var(--brand1);color:#fff}
#nx-chat-log{padding:12px;overflow-y:auto;max-height:55vh;background:var(--card)}
.nx-msg{margin:8px 0;padding:10px;border-radius:10px;word-wrap:break-word}
.nx-msg.bot{background:#c7f0cc;color:#0b3815}
.nx-msg.user{background:#1e8e3e;color:#fff}
#nx-chat-form{display:flex;gap:8px;padding:10px;border-top:1px solid var(--border);background:var(--card)}
#nx-chat-input{flex:1;border:1px solid var(--border);border-radius:10px;padding:10px;background:var(--card);color:var(--text)}
.toggle{display:inline-flex;align-items:center;gap:8px;background:#ffffff22;color:#fff;border:none;padding:8px 12px;border-radius:999px;cursor:pointer;font-weight:600;backdrop-filter:blur(4px)}
.sr-only{position:absolute;width:1px;height:1px;clip:rect(0 0 0 0);overflow:hidden;white-space:nowrap}
iframe{width:100%;border:none;border-radius:10px;background:#fff}
footer{text-align:center;color:var(--muted);padding:30px 12px}
footer a{color:var(--brand1);text-decoration:none}