:root {
  --bg: #f0f2f5;
  --sidebar-bg: #ffffff;
  --sidebar: #1e293b;
  --sidebar-active: #334155;
  --accent: #d97706;
  --accent-hover: #b45309;
  --accent-subtle: rgba(217,119,6,.12);
  --hdr-fg: #f1f5f9;
  --card-bg: #ffffff;
  --card-border: rgba(0,0,0,.06);
  --row-odd: #ffffff;
  --row-even: #f1f5f9;
  --green: #16a34a;
  --green-bg: rgba(22,163,74,.1);
  --red: #dc2626;
  --red-bg: rgba(220,38,38,.1);
  --blue: #2563eb;
  --blue-bg: rgba(37,99,235,.1);
  --orange: #ea580c;
  --orange-bg: rgba(234,88,12,.1);
  --text: #1e293b;
  --sub-text: #64748b;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.08);
  --font: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Consolas', 'Fira Code', monospace;
  --radius: 10px;
  --radius-sm: 6px;
  --transition: .2s cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --bg: #0f1117;
  --sidebar-bg: #161822;
  --sidebar: #1e2030;
  --sidebar-active: #2a2d42;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --accent-subtle: rgba(245,158,11,.12);
  --hdr-fg: #e2e8f0;
  --card-bg: #1a1c2b;
  --card-border: rgba(255,255,255,.04);
  --row-odd: #1a1c2b;
  --row-even: #222438;
  --green: #22c55e;
  --green-bg: rgba(34,197,94,.12);
  --red: #ef4444;
  --red-bg: rgba(239,68,68,.12);
  --blue: #3b82f6;
  --blue-bg: rgba(59,130,246,.12);
  --orange: #f97316;
  --orange-bg: rgba(249,115,22,.12);
  --text: #e2e8f0;
  --sub-text: #94a3b8;
  --border: #2d3048;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,.25);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Custom Scrollbar ──────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--sub-text); }
* { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }

/* ── Header ─────────────────────────────────── */
.app-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 64px;
  background: linear-gradient(135deg, var(--sidebar) 0%, #151829 100%);
  color: var(--hdr-fg);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 100;
  gap: 24px;
  box-shadow: 0 1px 3px rgba(0,0,0,.15);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.3px;
}

.brand-icon { font-size: 24px; }
.brand-sub { font-size: 13px; opacity: .7; font-weight: 400; }

.header-nav {
  display: flex;
  gap: 2px;
  margin-left: auto;
}

.nav-link {
  color: rgba(255,255,255,.65);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-link:hover { background: rgba(255,255,255,.08); color: #fff; }
.nav-link.active { background: var(--accent); color: #fff; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  background: rgba(255,255,255,.08);
  border: none;
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.theme-toggle:hover { background: rgba(255,255,255,.16); }

.header-status {
  font-size: 12px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  background: rgba(255,255,255,.06);
  padding: 4px 12px;
  border-radius: 20px;
}

/* ── Layout ──────────────────────────────────── */
.app-layout {
  display: flex;
  padding-top: 64px;
  min-height: 100vh;
}

.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 20px 16px;
  transition: background var(--transition);
}

.sidebar-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--sub-text);
  margin-bottom: 12px;
  font-weight: 600;
}

.device-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  font-size: 13px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.device-item:hover { background: var(--accent-subtle); }

.dev-name { flex: 1; font-weight: 500; }

.main-content {
  flex: 1;
  padding: 28px;
  max-width: 1400px;
}

/* ── Dots ────────────────────────────────────── */
.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-green { background: var(--green); box-shadow: 0 0 6px var(--green); }
.dot-red { background: var(--red); box-shadow: 0 0 6px var(--red); }
.dot-grey { background: var(--sub-text); }

/* ── Cards ───────────────────────────────────── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  margin-bottom: 20px;
  border: 1px solid var(--card-border);
  transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.card-header .card-title {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

/* ── Dashboard tag grid ──────────────────────── */
.tag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.tag-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--card-border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.tag-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--accent);
}

.tag-card-name {
  font-size: 11px;
  color: var(--sub-text);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: .5px;
  font-weight: 600;
}

.tag-card-value-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.tag-card-value {
  font-size: 26px;
  font-weight: 700;
  font-family: var(--mono);
  line-height: 1.2;
  transition: color var(--transition);
}

.tag-card-uom {
  font-size: 13px;
  color: var(--sub-text);
}

.tag-card-info {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-size: 11px;
  color: var(--sub-text);
}

.tag-card-sparkline {
  margin-top: 8px;
  height: 28px;
  width: 100%;
}

.tag-card-sparkline canvas {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-sm);
}

.tag-card.alarm {
  border-left: 4px solid var(--red);
}
.tag-card.alarm .tag-card-value { color: var(--red); }

.tag-card.bad {
  opacity: .55;
}

.tag-card-anomaly {
  margin-top: 6px;
  font-size: 11px;
  color: var(--red);
  font-weight: 700;
  padding: 3px 8px;
  background: var(--red-bg);
  border-radius: var(--radius-sm);
  animation: pulse-anomaly 1s ease-in-out 3;
}

@keyframes pulse-anomaly {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.tag-card-prediction {
  margin-top: 6px;
  font-size: 11px;
  color: var(--accent);
  font-weight: 600;
  padding: 3px 8px;
  background: var(--accent-subtle);
  border-radius: var(--radius-sm);
}

/* ── Tables ──────────────────────────────────── */
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table.data-table th {
  background: var(--sidebar);
  color: var(--hdr-fg);
  text-align: left;
  padding: 12px 14px;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .4px;
}

table.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

table.data-table tr:last-child td {
  border-bottom: none;
}

table.data-table tr:nth-child(even) td {
  background: var(--row-even);
}

table.data-table tbody tr:hover td {
  background: var(--accent-subtle);
}

/* ── Badges ──────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .3px;
}

.badge-red { background: var(--red-bg); color: var(--red); }
.badge-green { background: var(--green-bg); color: var(--green); }
.badge-blue { background: var(--blue-bg); color: var(--blue); }
.badge-orange { background: var(--orange-bg); color: var(--orange); }

.badge-red.hidden { display: none; }

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 18px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  touch-action: manipulation;
}

.btn:hover { opacity: .9; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 2px 8px rgba(217,119,6,.35); }
.btn-secondary { background: var(--sidebar); color: var(--hdr-fg); }
.btn-secondary:hover { background: var(--sidebar-active); }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { box-shadow: 0 2px 8px rgba(220,38,38,.35); }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }

/* ── Forms ───────────────────────────────────── */
.form-group { margin-bottom: 16px; }

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--sub-text);
  text-transform: uppercase;
  letter-spacing: .3px;
}

.form-control {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  background: var(--card-bg);
  color: var(--text);
  transition: all var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.form-inline {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.filter-pills {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.pill {
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text);
}

.pill:hover { border-color: var(--accent); color: var(--accent); }
.pill.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ── Alarm severity row colors ───────────────── */
.alarm-row-fault td { background: var(--red-bg) !important; }
.alarm-row-alarm td { background: var(--red-bg) !important; }
.alarm-row-warning td { background: var(--orange-bg) !important; }
.alarm-row-info td { background: var(--blue-bg) !important; }

/* ── Status bar / Stats ──────────────────────── */
.stats-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.stat-card {
  flex: 1;
  min-width: 130px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 18px 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--card-border);
  text-align: center;
  transition: all var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stat-card-value {
  font-size: 28px;
  font-weight: 700;
  font-family: var(--mono);
  line-height: 1.2;
}

.stat-card-label {
  font-size: 11px;
  color: var(--sub-text);
  margin-top: 6px;
  text-transform: uppercase;
  letter-spacing: .5px;
  font-weight: 600;
}

/* ── Process / Valve page ────────────────────── */
.process-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

@media (max-width: 1024px) {
  .process-grid { grid-template-columns: 1fr; }
}

.tank-card .card-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tank-visual {
  display: flex;
  justify-content: center;
  padding: 8px 0;
}

.tank-svg {
  max-width: 350px;
  height: auto;
}

.controls-card .control-section {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.controls-card .control-section:last-child { border-bottom: none; }

.control-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--sub-text);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .5px;
}

.btn-group {
  display: flex;
  gap: 6px;
}

.mode-btn {
  transition: all var(--transition);
}

.mode-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.valve-slider {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  transition: background var(--transition);
}

.valve-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,.2);
  transition: transform var(--transition);
}
.valve-slider::-webkit-slider-thumb:hover { transform: scale(1.15); }

.slider-value {
  min-width: 44px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
}

.seq-label {
  display: inline-block;
  margin-left: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}

/* Process variables */
.process-vars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.var-item {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.var-item:hover { background: var(--accent-subtle); }

.var-label {
  font-size: 11px;
  color: var(--sub-text);
  text-transform: uppercase;
  letter-spacing: .4px;
  font-weight: 600;
}

.var-value {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
  margin-left: auto;
}

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

/* Valve indicators */
.valve-status-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.valve-status-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.valve-indicator {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 3px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.valve-pip {
  width: 4px;
  height: 28px;
  background: var(--accent);
  border-radius: 2px;
  transform: rotate(0deg);
  transition: transform .5s cubic-bezier(.4,0,.2,1);
}

.valve-status-text {
  font-size: 13px;
}

.valve-status-text div {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 16px;
  margin-top: 4px;
}

.interlock-msg {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--red-bg);
  border: 1px solid var(--red);
  border-radius: var(--radius-sm);
  color: var(--red);
  font-size: 13px;
  font-weight: 600;
}

.interlock-msg.hidden { display: none; }

/* ── AI Chat ─────────────────────────────────── */
.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 160px);
  max-height: 700px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-msg {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.5;
  animation: fadeIn .25s cubic-bezier(.4,0,.2,1);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.chat-msg.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  border-bottom-right-radius: 4px;
}

.chat-msg.ai {
  align-self: flex-start;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.chat-input-row {
  display: flex;
  gap: 8px;
  padding: 12px 0;
}

.chat-input-row input {
  flex: 1;
}

.chat-tool-badge, .chat-tool-used {
  font-size: 11px;
  padding: 3px 10px;
  background: var(--blue-bg);
  color: var(--blue);
  border-radius: 20px;
  margin-top: 6px;
  display: inline-block;
  font-weight: 600;
}

/* ── Hamburger ────────────────────────────────── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,.08);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 6px;
  flex-shrink: 0;
  transition: background var(--transition);
}
.hamburger:hover { background: rgba(255,255,255,.16); }
.hamburger span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .25s cubic-bezier(.4,0,.2,1), opacity .2s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  backdrop-filter: blur(2px);
  z-index: 98;
  opacity: 0;
  transition: opacity .3s;
  visibility: hidden;
  pointer-events: none;
}
.nav-overlay.open { opacity: 1; visibility: visible; pointer-events: auto; }

/* ── Page transitions ───────────────────────── */
@keyframes pageIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.main-content > * { animation: pageIn .35s cubic-bezier(.4,0,.2,1); }

/* ── Tablet ───────────────────────────────── */
@media (max-width: 1024px) {
  .sidebar { width: 180px; padding: 16px 10px; }
  .main-content { padding: 20px; }
  .tag-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}

/* ── Mobile ───────────────────────────────── */
@media (max-width: 768px) {
  html.menu-open, html.menu-open body { overflow: hidden; }
  .hamburger { display: flex; }
  .nav-overlay { display: block; }
  .sidebar { display: none; }
  .header-nav {
    display: flex;
    position: fixed;
    top: 0; left: 0;
    width: min(280px, 75vw);
    height: 100vh;
    height: 100dvh;
    background: linear-gradient(180deg, var(--sidebar) 0%, #151829 100%);
    flex-direction: column;
    padding: 72px 12px 16px;
    gap: 2px;
    margin: 0;
    z-index: 101;
    transform: translateX(-100%);
    transition: transform .3s cubic-bezier(.4,0,.2,1);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }
  .header-nav.open { transform: translateX(0); }
  .nav-link {
    font-size: 14px;
    padding: 12px 16px;
    width: 100%;
    text-align: left;
    border-radius: var(--radius-sm);
    touch-action: manipulation;
  }
  .nav-link:hover { background: rgba(255,255,255,.08); }
  .nav-devices { margin-top: auto; padding-top: 12px; border-top: 1px solid rgba(255,255,255,.1); }
  .nav-devices-title { font-size: 10px; text-transform: uppercase; letter-spacing: .5px; color: rgba(255,255,255,.4); padding: 8px 16px 4px; font-weight: 600; }
  .nav-device-item { display: flex; align-items: center; gap: 8px; padding: 6px 16px; font-size: 12px; color: rgba(255,255,255,.6); }
  .header-actions { margin-left: auto; }
  .main-content { padding: 12px; }
  .tag-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .form-inline { grid-template-columns: 1fr; }
  .stats-bar { flex-direction: column; }
  .card { padding: 14px; }
  .process-vars { grid-template-columns: 1fr; }
  .valve-status-grid { grid-template-columns: 1fr; }
  .chat-container { height: calc(100vh - 160px); height: calc(100dvh - 160px); }
  .chat-msg { max-width: 90%; }
}