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

:root {
  --bg:           #f1f5f9;
  --bg-card:      #ffffff;
  --bg-inner:     #f8fafc;
  --border:       #e2e8f0;

  --text:         #0f172a;
  --text-sec:     #334155;
  --text-muted:   #64748b;

  --green:        #22c55e;
  --green-bg:     #f0fdf4;
  --green-border: #bbf7d0;
  --green-text:   #16a34a;

  --blue:         #3b82f6;
  --blue-bg:      #eff6ff;
  --blue-border:  #bfdbfe;
  --blue-text:    #1d4ed8;

  --purple:       #8b5cf6;
  --purple-bg:    #f5f3ff;
  --purple-border:#ddd6fe;
  --purple-text:  #6d28d9;

  --yellow:       #f59e0b;
  --yellow-bg:    #fffbeb;
  --yellow-border:#fde68a;
  --yellow-text:  #b45309;

  --red:          #ef4444;
  --red-bg:       #fef2f2;
  --red-border:   #fecaca;
  --red-text:     #b91c1c;

  --orange:       #f97316;
  --orange-bg:    #fff7ed;
  --orange-border:#fed7aa;
  --orange-text:  #c2410c;

  --radius:       14px;
  --radius-sm:    9px;
  --shadow:       0 1px 3px rgba(0,0,0,.04), 0 4px 20px rgba(0,0,0,.06);
  --shadow-sm:    0 1px 4px rgba(0,0,0,.08);
  --shadow-hover: 0 4px 28px rgba(0,0,0,.10);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Progress Bar ─────────────────────────────────────────────────────────── */
.progress-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--border);
  z-index: 300;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), #86efac);
  transition: width .5s linear;
}

/* ── Header ───────────────────────────────────────────────────────────────── */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 3px;
  z-index: 200;
  box-shadow: var(--shadow-sm);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, #22c55e, #86efac);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(34,197,94,.35);
}
.logo-name { font-size: 15px; font-weight: 700; color: var(--text); letter-spacing: -.3px; line-height: 1.2; }
.logo-sub  { font-size: 11px; color: var(--text-muted); }

/* ── Header Nav ───────────────────────────────────────────────────────────── */
.header-nav {
  display: flex;
  gap: 2px;
  background: var(--bg);
  padding: 4px;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 16px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all .15s;
  font-family: inherit;
}
.tab-btn:hover { color: var(--text-sec); background: rgba(255,255,255,.7); }
.tab-btn.active {
  background: var(--bg-card);
  color: var(--green-text);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* ── Header Actions ───────────────────────────────────────────────────────── */
.header-actions { display: flex; align-items: center; gap: 16px; }
.refresh-info { font-size: 12px; color: var(--text-muted); white-space: nowrap; }
.refresh-info span { color: var(--text-sec); font-weight: 600; }

.btn-refresh {
  background: var(--green);
  border: none;
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  transition: all .15s;
  box-shadow: 0 2px 8px rgba(34,197,94,.3);
  white-space: nowrap;
}
.btn-refresh:hover   { background: var(--green-text); }
.btn-refresh:disabled { opacity: .6; cursor: not-allowed; }

.btn-tv {
  background: #475569;
  border: none;
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  transition: all .15s;
  white-space: nowrap;
}
.btn-tv:hover { background: #334155; }

/* ── Layout ───────────────────────────────────────────────────────────────── */
.container { max-width: 1440px; margin: 0 auto; padding: 28px 24px; }

/* ── Summary Cards ────────────────────────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.summary-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform .15s, box-shadow .15s;
}
.summary-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--green);
  border-radius: var(--radius) var(--radius) 0 0;
}
.summary-card.accent-blue::before   { background: var(--blue); }
.summary-card.accent-purple::before { background: var(--purple); }
.summary-card.accent-orange::before { background: var(--orange); }
.summary-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.card-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .6px;
}
.card-icon         { font-size: 18px; color: var(--green); }
.card-icon.blue    { color: var(--blue); }
.card-icon.purple  { color: var(--purple); }
.card-icon.orange  { color: var(--orange); }

.card-value        { font-size: 26px; font-weight: 700; letter-spacing: -.5px; margin-bottom: 4px; color: var(--green-text); }
.card-value.blue   { color: var(--blue-text); }
.card-value.purple { color: var(--purple-text); }
.card-value.orange { color: var(--orange-text); }

.card-sub { font-size: 12px; color: var(--text-muted); }

/* ── Status Badges ────────────────────────────────────────────────────────── */
.status-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }

.badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.badge-online  { background: var(--green-bg);  color: var(--green-text);  border: 1px solid var(--green-border); }
.badge-alarm   { background: var(--yellow-bg); color: var(--yellow-text); border: 1px solid var(--yellow-border); }
.badge-offline { background: var(--red-bg);    color: var(--red-text);    border: 1px solid var(--red-border); }
.badge-no_comm { background: var(--blue-bg);   color: var(--blue-text);   border: 1px solid var(--blue-border); }
.badge-error   { background: var(--orange-bg); color: var(--orange-text); border: 1px solid var(--orange-border); }
.badge-ok      { background: #f8fafc; color: var(--text-muted); border: 1px solid var(--border); }

/* ── Chart Section ────────────────────────────────────────────────────────── */
.chart-section {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}
.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.chart-title { font-size: 15px; font-weight: 700; color: var(--text); }
.chart-sub-badge {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg);
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  font-weight: 500;
}
.chart-wrapper { position: relative; height: 220px; }

/* ── Group Sections ───────────────────────────────────────────────────────── */
.groups-container { display: flex; flex-direction: column; gap: 14px; }

.group-section {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  user-select: none;
  transition: background .1s;
}
.group-header:hover { background: var(--bg-inner); }

.group-header-left { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.group-name { font-weight: 700; font-size: 15px; color: var(--text); }
.group-badge {
  font-size: 10px;
  padding: 3px 9px;
  border-radius: 20px;
  font-weight: 600;
  background: var(--bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.group-metrics { display: flex; gap: 28px; align-items: center; }
.group-metric  { text-align: right; }
.m-label { font-size: 11px; color: var(--text-muted); }
.m-value { font-size: 14px; font-weight: 700; color: var(--green-text); }

.group-chevron {
  color: var(--text-muted);
  font-size: 12px;
  transition: transform .2s;
  margin-left: 10px;
  flex-shrink: 0;
}
.group-section.collapsed .group-chevron { transform: rotate(-90deg); }

.group-body {
  padding: 4px 12px 14px;
  border-top: 1px solid var(--border);
}
.group-section.collapsed .group-body { display: none; }

/* ── Plant Cards Grid ─────────────────────────────────────────────────────── */
.plants-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  padding-top: 10px;
}

.plant-card {
  background: var(--bg-inner);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  transition: all .15s;
}
.plant-card:hover {
  border-color: var(--green);
  box-shadow: 0 2px 14px rgba(34,197,94,.14);
  transform: translateY(-1px);
}

.plant-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 10px;
}
.plant-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
  flex: 1;
  padding-right: 8px;
}

.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 3px;
}
.status-dot.online  { background: var(--green);  box-shadow: 0 0 6px rgba(34,197,94,.6); }
.status-dot.alarm   { background: var(--yellow); box-shadow: 0 0 6px rgba(245,158,11,.6); }
.status-dot.offline { background: #cbd5e1; }
.status-dot.no_comm { background: var(--blue); }
.status-dot.error   { background: var(--orange); }

.plant-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.p-metric .p-label { font-size: 10px; color: var(--text-muted); margin-bottom: 1px; }
.p-metric .p-value { font-size: 15px; font-weight: 700; }
.p-metric.power .p-value { color: var(--green-text); }
.p-metric.today .p-value { color: var(--blue-text); }
.p-metric.total .p-value { color: var(--text-sec); }
.p-metric.cap   .p-value { color: var(--text-muted); }
.p-metric .p-unit { font-size: 10px; color: var(--text-muted); }

.brand-tag {
  margin-top: 10px;
  font-size: 10px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 7px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand-name    { font-weight: 700; text-transform: uppercase; letter-spacing: .5px; }
.brand-sungrow { color: #ea580c; }
.brand-chint   { color: #2563eb; }
.brand-growatt { color: #16a34a; }

/* ── Loading / Error ──────────────────────────────────────────────────────── */
.loading-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 70px 0;
  color: var(--text-muted);
  font-size: 14px;
  gap: 10px;
}

.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-msg {
  color: var(--red-text);
  font-size: 11px;
  margin-top: 6px;
  padding: 6px 8px;
  background: var(--red-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--red-border);
}

/* ── Login Screen ─────────────────────────────────────────────────────────── */
.login-screen {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  z-index: 500;
}
.login-screen.hidden { display: none; }

.login-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 40px 36px;
  width: 360px;
  max-width: calc(100vw - 32px);
  box-shadow: 0 4px 40px rgba(0,0,0,.10);
  border: 1px solid var(--border);
}

.login-logo {
  text-align: center;
  margin-bottom: 32px;
}
.login-logo-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, #22c55e, #86efac);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px;
  margin: 0 auto 12px;
  box-shadow: 0 4px 14px rgba(34,197,94,.35);
}
.login-logo-name { font-size: 18px; font-weight: 700; color: var(--text); }
.login-logo-sub  { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

.login-field { margin-bottom: 16px; }
.login-field label {
  display: block;
  font-size: 12px; font-weight: 600;
  color: var(--text-sec);
  margin-bottom: 6px;
}
.login-field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-inner);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.login-field input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(34,197,94,.15);
}

.login-error {
  font-size: 12px;
  color: var(--red-text);
  background: var(--red-bg);
  border: 1px solid var(--red-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  margin-bottom: 12px;
  display: none;
}
.login-error:not(:empty) { display: block; }

.btn-login {
  width: 100%;
  padding: 11px;
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  margin-top: 4px;
  box-shadow: 0 2px 8px rgba(34,197,94,.3);
  transition: background .15s;
}
.btn-login:hover    { background: var(--green-text); }
.btn-login:disabled { opacity: .6; cursor: not-allowed; }

/* ── Header User / Logout ─────────────────────────────────────────────────── */
.header-user { display: flex; align-items: center; gap: 8px; }
.header-username {
  font-size: 12px; font-weight: 600;
  color: var(--text-muted);
}
.btn-logout {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: all .15s;
}
.btn-logout:hover {
  background: var(--red-bg);
  border-color: var(--red-border);
  color: var(--red-text);
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .summary-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 800px) {
  .header-nav    { display: none; }
  .summary-grid  { grid-template-columns: repeat(2, 1fr); }
  .group-metrics { display: none; }
  .header        { padding: 0 16px; }
  .container     { padding: 16px; }
}
@media (max-width: 480px) {
  .summary-grid  { grid-template-columns: 1fr 1fr; }
  .refresh-info  { display: none; }
}