/* ===========================================================
   Hidroponik IoT — Control Panel theme
   Palette: white surface, blue brand scale (#2C5EAD / #1591DC /
   #4BB8FA / #C4E2F5). Green/red reserved for status semantics only.
=========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg-void: #ffffff;
  --bg-panel: #ffffff;
  --bg-panel-raised: #f2f8fd;
  --border: #d7e9f7;
  --border-soft: #e7f1fa;
  --text-primary: #142033;
  --text-muted: #5a7590;
  --text-dim: #93a9c0;

  --accent: #1591dc;
  --accent-dim: #2c5ead;
  --water: #4bb8fa;
  --pale: #c4e2f5;

  --success: #16a34a;
  --amber: #d97706;
  --danger: #dc2626;

  --radius: 10px;
  --radius-sm: 6px;

  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg-void);
  background-image:
    radial-gradient(circle at 15% 0%, rgba(21, 145, 220, 0.05), transparent 40%),
    radial-gradient(circle at 90% 15%, rgba(75, 184, 250, 0.06), transparent 45%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-body);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Layout: sidebar + main ---------- */

.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0 0.5rem 1.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-soft);
}

.brand-mark {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent-dim), var(--water));
  display: flex; align-items: center; justify-content: center;
  color: #ffffff;
}

.brand-name {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}
.brand-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 0.2rem;
}
.nav-link:hover { background: var(--bg-panel-raised); color: var(--text-primary); }
.nav-link.active { background: var(--bg-panel-raised); color: var(--accent); }

.sidebar-footer {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-soft);
  font-size: 0.8rem;
  color: var(--text-muted);
}
.sidebar-footer .who { color: var(--text-primary); font-weight: 600; margin-bottom: 0.5rem; text-decoration: none; }
.sidebar-footer .who:hover { color: var(--accent); }
.logout-link { color: var(--danger); text-decoration: none; font-weight: 500; }

.main {
  flex: 1;
  padding: 2rem 2.5rem;
  width: 100%;
}

.page-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.page-title { font-size: 1.4rem; font-weight: 700; margin: 0; }
.page-sub { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.25rem; }

/* ---------- Cards / panels ---------- */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  box-shadow: 0 1px 2px rgba(20, 32, 51, 0.04), 0 1px 8px rgba(20, 32, 51, 0.03);
}

.grid {
  display: grid;
  gap: 1rem;
}
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.tandon-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
@media (max-width: 900px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-4, .grid-2, .tandon-grid { grid-template-columns: 1fr; } }

.stat-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  box-shadow: 0 1px 2px rgba(20, 32, 51, 0.04), 0 1px 8px rgba(20, 32, 51, 0.03);
}
.stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
}
.stat-unit { font-size: 1rem; color: var(--text-muted); font-weight: 500; margin-left: 0.15rem; }

.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  display: inline-block;
  background: var(--text-dim);
}
.status-dot.ok { background: var(--success); box-shadow: 0 0 6px var(--success); }
.status-dot.warn { background: var(--amber); box-shadow: 0 0 6px var(--amber); }
.status-dot.danger { background: var(--danger); box-shadow: 0 0 6px var(--danger); }

/* ---------- Tandon cards on dashboard ---------- */

.tandon-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  text-decoration: none;
  color: var(--text-primary);
  box-shadow: 0 1px 2px rgba(20, 32, 51, 0.04), 0 1px 8px rgba(20, 32, 51, 0.03);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.tandon-card:hover { border-color: var(--accent-dim); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(20, 32, 51, 0.08); }

.tandon-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.tandon-name { font-weight: 600; font-size: 1.02rem; }
.tandon-mini-stats {
  display: flex;
  gap: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}
.tandon-mini-stats .lbl { display: block; font-family: var(--font-body); font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.15rem; }
.tandon-card-actions { display: flex; gap: 0.5rem; margin-top: 0.2rem; }
.tandon-card-actions .btn { flex: 1; text-align: center; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-panel-raised);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { border-color: var(--accent-dim); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #ffffff; }
.btn-primary:hover { background: var(--accent-dim); border-color: var(--accent-dim); }
.btn-full { width: 100%; }
.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.78rem; }

/* ---------- Forms ---------- */

label { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; display: block; margin-bottom: 0.35rem; }
input[type=text], input[type=password], input[type=number] {
  width: 100%;
  background: var(--bg-panel-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.92rem;
}
input:focus { border-color: var(--accent); }
.field { margin-bottom: 1rem; }
.field-row { display: flex; gap: 1rem; }
.field-row > .field { flex: 1; }

.form-error {
  background: rgba(220, 38, 38, 0.07);
  border: 1px solid rgba(220, 38, 38, 0.25);
  color: var(--danger);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  margin-bottom: 1rem;
  display: none;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
}
.toggle input { width: 38px; height: 20px; accent-color: var(--accent); }

/* ---------- Auth pages ---------- */

.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.auth-card {
  width: 100%;
  max-width: 360px;
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  box-shadow: 0 4px 24px rgba(20, 32, 51, 0.07);
}
.auth-brand { text-align: center; margin-bottom: 1.75rem; }
.auth-brand .brand-mark { margin: 0 auto 0.75rem; }
.auth-title { font-size: 1.1rem; font-weight: 700; }
.auth-sub { color: var(--text-muted); font-size: 0.82rem; margin-top: 0.3rem; }
.auth-switch { text-align: center; margin-top: 1.25rem; font-size: 0.83rem; color: var(--text-muted); }
.auth-switch a { color: var(--accent); text-decoration: none; font-weight: 600; }

/* ---------- Modal ---------- */

.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(5, 10, 8, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1rem;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 12px 32px rgba(20, 32, 51, 0.14);
}
.modal h3 { margin-top: 0; }
.modal-actions { display: flex; gap: 0.6rem; margin-top: 1.25rem; }
.modal-actions .btn { flex: 1; }

.device-id-box {
  background: var(--bg-panel-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 0.6rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.device-id-box .copy { color: var(--accent); cursor: pointer; font-size: 0.75rem; font-weight: 600; }

/* ---------- Liquid tank gauge ---------- */

.tank-wrap {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.tank-status-layout {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.tank-status-layout .grid-2 { flex: 1; min-width: 280px; }
.tank {
  width: 90px;
  height: 150px;
  border: 2px solid var(--border);
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  background: var(--bg-panel-raised);
  flex-shrink: 0;
}
.tank-fill {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(180deg, var(--water), var(--accent-dim));
  transition: height 0.6s ease;
}
.tank-fill::before {
  content: '';
  position: absolute;
  top: -3px; left: 0; right: 0; height: 6px;
  background: rgba(255,255,255,0.25);
}
.tank-pct {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
}
.tank-detail { color: var(--text-muted); font-size: 0.8rem; margin-top: 0.2rem; }

/* ---------- Relay LED panel ---------- */

.relay-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.9rem;
}
.relay {
  background: var(--bg-panel-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 0.7rem;
  text-align: center;
}
.led {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--border);
  margin: 0 auto 0.6rem;
  box-shadow: inset 0 0 3px rgba(20, 32, 51, 0.15);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}
.led.on {
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent), 0 0 2px var(--accent);
  animation: pulse 1s ease-in-out 2;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
.relay-label { font-size: 0.72rem; color: var(--text-muted); line-height: 1.3; }

/* ---------- Table ---------- */

table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { text-align: left; padding: 0.6rem 0.5rem; border-bottom: 1px solid var(--border-soft); }
th { color: var(--text-muted); font-weight: 500; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; }
td.mono { font-family: var(--font-mono); }

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
}
.badge-auto { background: rgba(44, 94, 173, 0.1); color: var(--accent-dim); }
.badge-manual { background: rgba(21, 145, 220, 0.1); color: var(--accent); }

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem 1rem;
  font-size: 0.88rem;
}

.section-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 1rem;
}

.toast {
  position: fixed;
  bottom: 1.5rem; right: 1.5rem;
  background: var(--bg-panel-raised);
  border: 1px solid var(--accent-dim);
  color: var(--text-primary);
  padding: 0.75rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.25s ease;
  pointer-events: none;
  z-index: 100;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* ---------- Icons ---------- */

.icon { display: inline-block; vertical-align: -3px; flex-shrink: 0; }
.page-title { display: flex; align-items: center; gap: 0.5rem; }
.btn .icon, .nav-link .icon, .stat-label .icon, .section-title .icon { vertical-align: -3px; }
.nav-link { display: flex; align-items: center; }
.section-title { display: flex; align-items: center; gap: 0.4rem; }
.who { display: flex; align-items: center; gap: 0.4rem; }

/* ---------- Dashboard layout ---------- */

.dashboard-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 1000px) {
  .dashboard-layout { grid-template-columns: 1fr; }
}
.side-panels {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.icon-btn-danger {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
}
.icon-btn-danger:hover { color: var(--danger); background: rgba(220, 38, 38, 0.08); }

.btn-danger {
  background: var(--danger);
  border-color: var(--danger);
  color: #ffffff;
}
.btn-danger:hover { background: #b91c1c; border-color: #b91c1c; }

/* ---------- Alerts panel ---------- */

.alert-item {
  display: block;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--border);
  background: var(--bg-panel-raised);
  text-decoration: none;
  margin-bottom: 0.5rem;
}
.alert-item:last-child { margin-bottom: 0; }
.alert-item.alert-warn { border-left-color: var(--amber); }
.alert-item.alert-offline { border-left-color: var(--danger); }
.alert-title { font-size: 0.83rem; font-weight: 600; color: var(--text-primary); }
.alert-msg { font-size: 0.76rem; color: var(--text-muted); margin-top: 0.15rem; }

/* ---------- Activity feed panel ---------- */

.activity-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border-soft);
  text-decoration: none;
}
.activity-item:last-child { border-bottom: none; }
.activity-title { font-size: 0.83rem; font-weight: 600; color: var(--text-primary); }
.activity-detail { font-size: 0.74rem; color: var(--text-muted); margin-top: 0.15rem; font-family: var(--font-mono); }
.activity-time { font-size: 0.7rem; color: var(--text-dim); margin-top: 0.3rem; }

.empty-state-sm {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 1rem 0.5rem;
}

/* ---------- Arc gauge (pH / TDS / suhu / kelembapan) ---------- */
.gauge-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 0.9rem;
  box-shadow: 0 1px 2px rgba(20, 32, 51, 0.04), 0 1px 8px rgba(20, 32, 51, 0.03);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.gauge-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.gauge-svg { width: 100%; max-width: 150px; height: auto; margin-bottom: -0.35rem; }
.gauge-track { fill: none; stroke: var(--border-soft); stroke-width: 9; stroke-linecap: round; }
.gauge-fill { fill: none; stroke: var(--accent); stroke-width: 9; stroke-linecap: round; transition: stroke-dashoffset 0.5s ease, stroke 0.3s ease; }
.gauge-fill.ok { stroke: var(--success); }
.gauge-fill.warn { stroke: var(--amber); }
.gauge-fill.danger { stroke: var(--danger); }
.gauge-value { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 700; line-height: 1; color: var(--text-primary); }
.gauge-unit { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; margin-left: 0.1rem; }
.gauge-sub { font-size: 0.75rem; color: var(--text-dim); margin-top: 0.2rem; }