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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }

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

.sidebar {
  width: 240px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform .25s;
}
.sidebar-logo {
  padding: 20px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex; align-items: center; gap: 10px;
}
.sidebar-logo img { width: 32px; height: 32px; }
.sidebar-logo span { font-size: 18px; font-weight: 700; color: var(--text-primary); }
.sidebar-logo small { display: block; font-size: 10px; color: var(--text-muted); font-weight: 400; }

.sidebar-nav { flex: 1; padding: 12px 0; overflow-y: auto; }
.nav-section { padding: 8px 16px 4px; font-size: 10px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .8px; color: var(--text-muted); }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 16px; font-size: 14px; font-weight: 500;
  color: var(--text-secondary); border-radius: 0; transition: all .15s;
  position: relative;
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active { color: var(--text-primary); background: rgba(37,99,235,.15); }
.nav-item.active::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--color-info); border-radius: 0 2px 2px 0;
}
.nav-item .icon { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  font-size: 12px; color: var(--text-muted);
}

.main-content {
  flex: 1;
  margin-left: 240px;
  display: flex; flex-direction: column; min-height: 100vh;
}

.topbar {
  height: 60px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  position: sticky; top: 0; z-index: 50;
}
.topbar-title { font-size: 18px; font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 16px; }
.topbar-user { font-size: 13px; color: var(--text-secondary); }
.btn-icon {
  background: none; border: none; color: var(--text-muted);
  padding: 6px; border-radius: var(--radius-sm); transition: all .15s;
}
.btn-icon:hover { background: var(--bg-hover); color: var(--text-primary); }
.btn-icon svg { width: 20px; height: 20px; display: block; }

.page-body { padding: 24px; flex: 1; }

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: space-between;
}
.card-header h3 { font-size: 15px; font-weight: 600; }
.card-body { padding: 20px; }

/* ── Grid ── */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }

/* ── Stat card ── */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  display: flex; flex-direction: column; gap: 8px;
}
.stat-label { font-size: 12px; font-weight: 500; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; }
.stat-value { font-size: 32px; font-weight: 700; line-height: 1; }
.stat-sub { font-size: 12px; color: var(--text-secondary); }

/* ── Badges ── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 8px; border-radius: 99px; font-size: 11px; font-weight: 600;
}
.badge-critica   { background: rgba(220,38,38,.15); color: #F87171; }
.badge-atencion  { background: rgba(217,119,6,.15); color: #FBB040; }
.badge-info      { background: rgba(37,99,235,.15); color: #60A5FA; }
.badge-ok        { background: rgba(22,163,74,.15); color: #4ADE80; }
.badge-offline   { background: rgba(107,114,128,.15); color: #9CA3AF; }
.badge-dot::before { content:''; width:6px; height:6px; border-radius:50%; background:currentColor; }

/* ── Health Score ── */
.health-ring {
  position: relative; display: inline-flex;
  align-items: center; justify-content: center;
}
.health-ring svg { transform: rotate(-90deg); }
.health-ring-value {
  position: absolute; font-size: 20px; font-weight: 700;
  transform: rotate(0deg);
}
.health-bar-wrap { flex: 1; }
.health-bar-bg {
  height: 8px; background: var(--border-color);
  border-radius: 4px; overflow: hidden;
}
.health-bar-fill { height: 100%; border-radius: 4px; transition: width .4s; }

/* ── Tank level ── */
.tank-visual {
  width: 60px; height: 100px;
  border: 2px solid var(--border-color);
  border-radius: 4px 4px 2px 2px;
  position: relative; overflow: hidden;
  background: var(--bg-primary);
}
.tank-fill {
  position: absolute; bottom: 0; left: 0; right: 0;
  transition: height .6s ease;
  border-radius: 0 0 1px 1px;
}
.tank-label { font-size: 13px; font-weight: 600; text-align: center; margin-top: 6px; }

/* ── Tables ── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  text-align: left; padding: 10px 12px;
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  color: var(--text-muted); letter-spacing: .5px;
  border-bottom: 1px solid var(--border-color);
}
td { padding: 12px; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-hover); color: var(--text-primary); }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 600; border: none; transition: all .15s;
}
.btn-primary { background: var(--color-info); color: #fff; }
.btn-primary:hover { background: #1D4ED8; }
.btn-danger { background: var(--color-critico); color: #fff; }
.btn-danger:hover { background: #B91C1C; }
.btn-ghost {
  background: transparent; color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); }
.btn-sm { padding: 5px 10px; font-size: 12px; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
label { display: block; font-size: 13px; font-weight: 500; color: var(--text-secondary); margin-bottom: 6px; }
input[type=text], input[type=email], input[type=password], select, textarea {
  width: 100%; padding: 10px 12px;
  background: var(--bg-primary); color: var(--text-primary);
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 14px; transition: border-color .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--color-info);
}

/* ── Alerts ── */
.alert {
  padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: 13px; margin-bottom: 16px; display: flex; align-items: center; gap: 8px;
}
.alert-error { background: rgba(220,38,38,.15); border: 1px solid rgba(220,38,38,.3); color: #FCA5A5; }
.alert-success { background: rgba(22,163,74,.15); border: 1px solid rgba(22,163,74,.3); color: #86EFAC; }
.alert-warn { background: rgba(217,119,6,.15); border: 1px solid rgba(217,119,6,.3); color: #FCD34D; }

/* ── Loading ── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { 0%{background-position:200%} 100%{background-position:-200%} }

.spinner {
  width: 24px; height: 24px; border: 2px solid var(--border-color);
  border-top-color: var(--color-info); border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to{transform:rotate(360deg)} }

/* ── Login page ── */
.login-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg-primary);
  background-image: radial-gradient(circle at 20% 50%, rgba(37,99,235,.08) 0%, transparent 50%),
                    radial-gradient(circle at 80% 20%, rgba(22,163,74,.05) 0%, transparent 40%);
}
.login-card {
  width: 100%; max-width: 400px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow);
}
.login-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 32px; }
.login-logo img { width: 44px; height: 44px; }
.login-logo h1 { font-size: 22px; font-weight: 700; }
.login-logo small { display: block; font-size: 11px; color: var(--text-muted); }

/* ── Activo card ── */
.activo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  text-decoration: none;
}
.activo-card:hover { border-color: var(--color-info); background: var(--bg-hover); }
.activo-name { font-size: 14px; font-weight: 600; color: var(--text-primary); }
.activo-tipo { font-size: 11px; color: var(--text-muted); margin-top: 2px; }
.activo-sensors { display: flex; gap: 16px; margin-top: 10px; flex-wrap: wrap; }
.sensor-pill { font-size: 12px; color: var(--text-secondary); }
.sensor-pill span { font-weight: 600; color: var(--text-primary); }

/* ── Alarm row ── */
.alarm-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px; align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  transition: background .15s;
}
.alarm-row:last-child { border-bottom: none; }
.alarm-row:hover { background: var(--bg-hover); }
.alarm-desc { font-size: 13px; color: var(--text-secondary); margin-top: 2px; }
.alarm-time { font-size: 11px; color: var(--text-muted); }

/* ── Chart container ── */
.chart-container { position: relative; }
.chart-container canvas { width: 100% !important; }

/* ── Gauge ── */
.gauge-wrap { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.gauge-value { font-size: 24px; font-weight: 700; }
.gauge-label { font-size: 11px; color: var(--text-muted); text-align: center; }
.gauge-unit { font-size: 12px; color: var(--text-secondary); }

/* ── Page header ── */
.page-header { margin-bottom: 24px; }
.page-header h1 { font-size: 22px; font-weight: 700; }
.page-header p { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }
.page-header-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }

/* ── Empty state ── */
.empty-state {
  text-align: center; padding: 48px 24px;
  color: var(--text-muted); font-size: 14px;
}
.empty-state .icon { font-size: 40px; margin-bottom: 12px; }

/* ── Sensor grid ── */
.sensor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.sensor-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
}
.sensor-box-value { font-size: 26px; font-weight: 700; margin: 4px 0; }
.sensor-box-label { font-size: 11px; color: var(--text-muted); }
.sensor-box-unit { font-size: 12px; color: var(--text-secondary); }

/* ── Cliente dashboard ── */
.status-big {
  display: flex; align-items: center; gap: 16px;
  padding: 24px; border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}
.status-big .icon { font-size: 48px; }
.status-big h2 { font-size: 24px; font-weight: 700; }
.status-big p { color: var(--text-secondary); margin-top: 4px; }

/* ── Formularios ── */
.input {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
}
.input:focus { border-color: var(--color-info); }
.input::placeholder { color: var(--text-muted); }
textarea.input { min-height: 80px; }
select.input { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; padding-right: 30px; }

.form-label { display: block; font-size: 12px; font-weight: 500; color: var(--text-secondary); margin-bottom: 6px; }

/* ── Modales ── */
.modal { display: none; position: fixed; inset: 0; z-index: 200; align-items: center; justify-content: center; padding: 16px; }
.modal-overlay { position: absolute; inset: 0; background: rgba(0,0,0,.6); }
.modal-box { position: relative; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; width: 100%; max-height: 90vh; display: flex; flex-direction: column; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,.5); }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border-color); flex-shrink: 0; }
.modal-header h3 { font-size: 16px; font-weight: 600; }
.modal-body { padding: 20px; overflow-y: auto; flex: 1; }
.modal-footer { display: flex; gap: 8px; justify-content: flex-end; padding: 14px 20px; border-top: 1px solid var(--border-color); flex-shrink: 0; }

/* ── Mobile hamburger ── */
.hamburger { display: none; }
#sidebar-overlay { display: none; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow); }
  .main-content { margin-left: 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-auto { grid-template-columns: 1fr; }
  .page-body { padding: 16px; }
  .topbar { padding: 0 16px; }
  .hamburger {
    display: flex; align-items: center; justify-content: center;
    background: none; border: none; color: var(--text-secondary);
    padding: 8px; cursor: pointer;
  }
  #sidebar-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.5); z-index: 99;
  }
  #sidebar-overlay.open { display: block; }
  .sensor-grid { grid-template-columns: repeat(2, 1fr); }
  .activo-sensors { gap: 8px; }
}