:root{
  --bg:#0f131a;
  --card:#171c25;
  --stroke:#232b38;
  --text:#eef0f3;
  --muted:#9aa3af;
  --accent:#4a68ff;
  --accent-2:#3650d8;
  --green:#10b981;
  --red:#ef4444;
}

*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:14px/1.4 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Arial}

.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--stroke);position:sticky;top:0;background:var(--bg);z-index:10}
.logo{display:flex;align-items:center;gap:10px}
.logo i{width:36px;height:36px;border-radius:8px;background:linear-gradient(180deg,#5b8cff,#2e55d8);background-size:cover;background-position:center}
.logo span{font-weight:600}

.container{max-width:1100px;margin:24px auto;padding:0 16px}

.btn{background:var(--accent);border:0;color:#fff;border-radius:10px;padding:8px 14px;font-weight:600;cursor:pointer;transition:background 0.2s}
.btn:hover{background:var(--accent-2)}

.periods{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:24px}
.period-card{background:var(--card);border:1px solid var(--stroke);border-radius:14px;padding:16px}
.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.card-header h3{margin:0}

.row{display:flex;gap:12px;align-items:center}
.field{display:flex;flex-direction:column;gap:6px;min-width:220px}
.field>span{color:var(--muted)}
.field input{height:40px;border:1px solid var(--stroke);background:#0f1420;color:var(--text);border-radius:10px;padding:0 10px;outline:none;transition:border 0.2s}
.field input:focus{border-color:var(--accent)}

.hint{margin-top:8px;color:var(--muted)}

.panel{background:var(--card);border:1px solid var(--stroke);border-radius:14px}
.panel-title{padding:12px 16px;border-bottom:1px solid var(--stroke);font-weight:600}
.table-wrap{overflow:auto}
.table{width:100%;border-collapse:collapse}
.table th,.table td{padding:10px 12px;border-bottom:1px solid var(--stroke)}
.table th{color:var(--muted);font-weight:600}
.table td.r,.table th.r{text-align:right}
.muted{color:var(--muted)}

/* Индикатор загрузки */
.loader{
  position:fixed;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:rgba(15,19,26,0.9);
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  z-index:1000;
}

.spinner{
  width:50px;
  height:50px;
  border:4px solid var(--stroke);
  border-top-color:var(--accent);
  border-radius:50%;
  animation:spin 0.8s linear infinite;
}

@keyframes spin{
  to{transform:rotate(360deg)}
}

.loader p{
  margin-top:16px;
  color:var(--muted);
}

/* Сообщение об ошибке */
.error-banner{
  position:fixed;
  top:70px;
  left:50%;
  transform:translateX(-50%);
  background:#dc2626;
  color:#fff;
  padding:12px 24px;
  border-radius:10px;
  box-shadow:0 4px 12px rgba(0,0,0,0.3);
  z-index:999;
  animation:slideDown 0.3s ease;
}

@keyframes slideDown{
  from{transform:translateX(-50%) translateY(-20px);opacity:0}
  to{transform:translateX(-50%) translateY(0);opacity:1}
}

/* Стили для изменений */
.buyer-rank{
  display:inline-block;
  background:var(--stroke);
  color:var(--muted);
  padding:2px 8px;
  border-radius:6px;
  font-size:12px;
  margin-right:8px;
}

.buyer-name{
  font-weight:500;
}

.change-badge{
  display:inline-block;
  padding:2px 8px;
  border-radius:6px;
  font-size:11px;
  margin-left:8px;
  font-weight:600;
}

.change-up{
  background:rgba(16,185,129,0.15);
  color:var(--green);
}

.change-down{
  background:rgba(239,68,68,0.15);
  color:var(--red);
}

.change-same{
  background:rgba(154,163,175,0.15);
  color:var(--muted);
}

/* Стили для страницы входа */
.login-page{display:flex;min-height:100vh;align-items:center;justify-content:center;background:#0f1218;color:#fff}
.login-card{background:#161a23;padding:24px 28px;border-radius:14px;width:320px;box-shadow:0 6px 30px rgba(0,0,0,.25)}
.login-card h1{margin:0 0 14px;font-size:20px}
.login-card label{display:block;font-size:12px;opacity:.8;margin:10px 0 6px}
.login-card input{width:100%;padding:10px 12px;border-radius:8px;border:1px solid #2a2f3a;background:#0f1218;color:#fff}
.login-card button{width:100%;margin-top:14px;padding:10px 12px;border:0;border-radius:8px;background:#3a59ff;color:#fff;cursor:pointer}
.login-card .err{margin-top:10px;color:#ff6b6b;font-size:12px}
.logout{position:fixed;top:14px;right:14px;background:#2a2f3a;border:0;color:#fff;border-radius:8px;padding:8px 12px;cursor:pointer}

/* Адаптивность */
@media (max-width: 768px){
  .periods{grid-template-columns:1fr}
  .field{min-width:150px}
}