/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f3f4f6;
  --surface: #ffffff;
  --surface-2: #f9fafb;
  --border: #e5e7eb;
  --text: #111827;
  --text-2: #6b7280;
  --text-3: #9ca3af;
  --blue: #3b82f6;
  --blue-hover: #2563eb;
  --green: #10b981;
  --green-hover: #059669;
  --red: #ef4444;
  --indigo: #6366f1;
  --sidebar-w: 64px;
  --card-radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  font-size: 14px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, sans-serif;
}

body { background: var(--bg); color: var(--text); line-height: 1.5; }


/* ── Login ────────────────────────────────────────────────────────────────── */
.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 50%, #ecfdf5 100%);
}

.login-card {
  background: var(--surface);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,.12);
  padding: 48px 40px;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.login-logo { margin-bottom: 4px; }
.login-title { font-size: 24px; font-weight: 700; color: var(--text); letter-spacing: -0.4px; }
.login-subtitle { color: var(--text-2); font-size: 14px; margin-bottom: 8px; }

.login-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--red);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  width: 100%;
  text-align: center;
}

.login-form { display: flex; flex-direction: column; gap: 12px; width: 100%; }

.login-input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  outline: none;
  transition: border-color .2s;
  background: var(--surface-2);
  color: var(--text);
}
.login-input:focus { border-color: var(--blue); background: var(--surface); }

.login-btn { width: 100%; padding: 12px; font-size: 15px; font-weight: 600; margin-top: 4px; }


/* ── App layout ───────────────────────────────────────────────────────────── */
.app-body { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: #1e2a38;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  box-shadow: 2px 0 8px rgba(0,0,0,.12);
}

.sidebar-logo {
  padding: 8px;
  margin-bottom: 24px;
  cursor: default;
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
  padding: 0 8px;
}

.sidebar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
  padding: 10px 0;
  border-radius: 10px;
  color: #94a3b8;
  text-decoration: none;
  transition: background .15s, color .15s;
  cursor: pointer;
}

.sidebar-label {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  line-height: 1;
}

.sidebar-item:hover { background: rgba(255,255,255,.08); color: #e2e8f0; }
.sidebar-item.active { background: rgba(59,130,246,.2); color: #60a5fa; }

.sidebar-footer { padding: 0 8px 8px; }

.sidebar-logout {
  background: none;
  border: none;
  color: #64748b;
  cursor: pointer;
  padding: 10px;
  border-radius: 10px;
  transition: background .15s, color .15s;
}
.sidebar-logout:hover { background: rgba(255,255,255,.08); color: #94a3b8; }

.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 28px 32px;
  max-width: 1400px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}


/* ── Page header ──────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 4px;
}

.page-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}

.page-subtitle {
  font-size: 13px;
  color: var(--text-2);
}


/* ── Cards ────────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.card-title svg { color: var(--text-2); flex-shrink: 0; }


/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background .15s, opacity .15s, transform .1s;
  white-space: nowrap;
}

.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--blue-hover); }

.btn-success { background: var(--green); color: #fff; }
.btn-success:hover:not(:disabled) { background: var(--green-hover); }


/* ── Progress area ────────────────────────────────────────────────────────── */
.progress-area {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 12px;
  color: var(--text-2);
  max-height: 140px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.progress-area .log-line { line-height: 1.6; }
.progress-area .log-error { color: var(--red); }


/* ── Data info ────────────────────────────────────────────────────────────── */
.data-info { padding: 16px 20px; }

.data-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.data-info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
}

.data-info-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-3);
}

.data-info-value {
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
  line-height: 1.5;
}


/* ── Params ───────────────────────────────────────────────────────────────── */
.params-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 16px 20px;
}

.param-group { display: flex; flex-direction: column; gap: 6px; }

.param-label { font-size: 13px; font-weight: 500; color: var(--text); }

.param-input-wrap { display: flex; align-items: center; gap: 10px; }

.param-input {
  width: 120px;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: var(--surface-2);
  outline: none;
  transition: border-color .2s;
}
.param-input:focus { border-color: var(--blue); background: var(--surface); }

.param-hint { font-size: 11px; color: var(--text-3); }


/* ── Charts ───────────────────────────────────────────────────────────────── */
.chart-container {
  padding: 8px 8px 4px;
  min-height: 200px;
}


/* ── Utilities ────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }

.spinner {
  display: inline-block;
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}

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


/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 680px) {
  .params-grid { grid-template-columns: 1fr; }
  .data-info-grid { grid-template-columns: 1fr; }
  .main-content { padding: 16px; }
}