:root {
  --bg: #f5f6fa;
  --card: #ffffff;
  --text: #1a1a2e;
  --text2: #666;
  --text3: #999;
  --red: #e64340;
  --green: #07c160;
  --blue: #1989fa;
  --orange: #ff976a;
  --border: #e8e8e8;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,.06);
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family: -apple-system, 'DM Sans', 'PingFang SC', sans-serif; background: var(--bg); color: var(--text); line-height:1.5; }
a { color: var(--blue); text-decoration: none; }

/* Auth */
.auth-page { display:flex; align-items:center; justify-content:center; min-height:100vh; padding:20px; background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%); }
.auth-container { width:100%; max-width:400px; }
.auth-box { background:#fff; border-radius:16px; padding:40px 32px; box-shadow:0 8px 40px rgba(0,0,0,.15); }
.auth-box h1 { text-align:center; font-size:22px; margin-bottom:4px; }
.auth-sub { text-align:center; color:var(--text2); font-size:13px; margin-bottom:24px; }
.form-group { margin-bottom:16px; }
.form-group input { width:100%; padding:12px 16px; border:1px solid var(--border); border-radius:8px; font-size:15px; outline:none; transition:border .2s; }
.form-group input:focus { border-color:var(--blue); }
.btn-primary { width:100%; padding:12px; background:var(--red); color:#fff; border:none; border-radius:8px; font-size:16px; font-weight:600; cursor:pointer; }
.btn-primary:hover { opacity:.9; }
.auth-link { text-align:center; margin-top:16px; font-size:13px; color:var(--text2); }
.error-msg { text-align:center; margin-top:12px; font-size:13px; color:var(--red); min-height:20px; }

/* Layout */
.layout { display:flex; min-height:100vh; }
.sidebar { width:220px; background:#1a1a2e; color:#fff; padding:20px 0; flex-shrink:0; }
.sidebar h2 { padding:0 20px 20px; font-size:16px; border-bottom:1px solid rgba(255,255,255,.1); }
.sidebar .nav { list-style:none; padding:10px 0; }
.sidebar .nav a { display:block; padding:12px 20px; color:rgba(255,255,255,.7); font-size:14px; transition:.2s; }
.sidebar .nav a:hover, .sidebar .nav a.active { background:rgba(255,255,255,.08); color:#fff; }
.main { flex:1; padding:20px; overflow-y:auto; }
.topbar { display:flex; justify-content:space-between; align-items:center; margin-bottom:20px; padding-bottom:16px; border-bottom:1px solid var(--border); }
.topbar .user-info { font-size:14px; color:var(--text2); }
.topbar .user-info strong { color:var(--text); font-weight:600; }
.btn-logout { padding:6px 16px; background:transparent; border:1px solid var(--border); border-radius:6px; cursor:pointer; font-size:13px; color:var(--text2); }
.btn-logout:hover { border-color:var(--red); color:var(--red); }

/* Cards */
.card { background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); padding:20px; margin-bottom:16px; }
.card-title { font-size:15px; font-weight:600; margin-bottom:12px; }
.stat-row { display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:12px; margin-bottom:16px; }
.stat-box { background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); padding:16px; text-align:center; }
.stat-box .num { font-size:24px; font-weight:700; }
.stat-box .lbl { font-size:12px; color:var(--text2); margin-top:4px; }

/* Trade Page */
.trade-layout { display:flex; gap:16px; height:calc(100vh - 120px); }
.chart-area { flex:1; display:flex; flex-direction:column; min-width:0; }
.chart-toolbar { display:flex; justify-content:space-between; align-items:center; margin-bottom:8px; flex-wrap:wrap; gap:6px; }
.period-btns { display:flex; gap:4px; }
.period-btns button { padding:4px 12px; border:1px solid var(--border); background:#fff; border-radius:4px; font-size:12px; cursor:pointer; color:var(--text); }
.period-btns button.active { background:var(--blue); color:#fff; border-color:var(--blue); }
.chart-container { flex:1; background:#fff; border-radius:var(--radius); box-shadow:var(--shadow); min-height:400px; position:relative; overflow:hidden; }
#kline-chart { width:100%; height:100%; }
.price-info-bar { display:flex; gap:20px; padding:12px 16px; background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); margin-bottom:8px; font-size:14px; }
.price-info-bar .price { font-size:22px; font-weight:700; }
.price-info-bar .up { color:var(--red); }
.price-info-bar .down { color:var(--green); }
.price-info-bar .label { font-size:12px; color:var(--text2); }

.trade-panel { width:340px; flex-shrink:0; background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); padding:16px; display:flex; flex-direction:column; gap:12px; }
.trade-panel h3 { font-size:15px; }
.trade-btns { display:flex; gap:8px; }
.trade-btns button { flex:1; padding:12px; border:none; border-radius:8px; font-size:15px; font-weight:600; cursor:pointer; color:#fff; }
.btn-buy { background:var(--red); }
.btn-sell { background:var(--green); }
.lot-ctrl { display:flex; align-items:center; gap:8px; }
.lot-ctrl button { width:36px; height:36px; border:1px solid var(--border); background:#fff; border-radius:8px; font-size:18px; cursor:pointer; }
.lot-ctrl input { width:80px; text-align:center; border:1px solid var(--border); border-radius:8px; padding:8px; font-size:15px; }
.margin-info { font-size:12px; color:var(--text2); padding:8px; background:var(--bg); border-radius:6px; }

/* Tables */
table { width:100%; border-collapse:collapse; font-size:13px; }
th { text-align:left; padding:10px 12px; background:var(--bg); color:var(--text2); font-weight:600; border-bottom:1px solid var(--border); }
td { padding:10px 12px; border-bottom:1px solid var(--border); }
.up { color:var(--red); }
.down { color:var(--green); }

/* Admin */
.search-bar { display:flex; gap:8px; margin-bottom:16px; flex-wrap:wrap; }
.search-bar input, .search-bar select { padding:8px 12px; border:1px solid var(--border); border-radius:6px; font-size:13px; }
.search-bar button { padding:8px 16px; background:var(--blue); color:#fff; border:none; border-radius:6px; cursor:pointer; font-size:13px; }
.batch-bar { display:flex; gap:8px; align-items:center; flex-wrap:wrap; padding:12px; background:var(--bg); border-radius:8px; margin-bottom:12px; }
.batch-bar input { width:100px; padding:6px 10px; border:1px solid var(--border); border-radius:6px; font-size:13px; }
.batch-bar button { padding:6px 14px; border:none; border-radius:6px; cursor:pointer; font-size:13px; color:#fff; }
.btn-danger { background:var(--red); }
.btn-success { background:var(--green); }

/* Modal */
.modal-overlay { display:none; position:fixed; top:0; left:0; right:0; bottom:0; background:rgba(0,0,0,.4); align-items:center; justify-content:center; z-index:1000; }
.modal-overlay.show { display:flex; }
.modal-box { background:#fff; border-radius:12px; padding:24px; width:90%; max-width:420px; max-height:80vh; overflow-y:auto; }
.modal-box h3 { font-size:16px; margin-bottom:16px; }
.modal-box .form-group { margin-bottom:12px; }
.modal-box .form-group label { display:block; font-size:13px; color:var(--text2); margin-bottom:4px; }
.modal-box .form-group input { width:100%; padding:8px 12px; border:1px solid var(--border); border-radius:6px; font-size:14px; }
.modal-btns { display:flex; gap:8px; margin-top:16px; }
.modal-btns button { flex:1; padding:10px; border:none; border-radius:8px; font-size:14px; font-weight:600; cursor:pointer; }
.modal-btns .cancel { background:var(--bg); color:var(--text2); }
.modal-btns .confirm { background:var(--red); color:#fff; }

/* Scrollbar */
::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-thumb { background:#ddd; border-radius:3px; }
::-webkit-scrollbar-track { background:transparent; }