/* Variables de identidad visual industrial */
:root {
    --bg-dark: #0b1018;
    --card-bg: #161f2b;
    --border-color: #2a3a4d;
    --accent-blue: #00b4ff;
    --accent-danger: #ff3333;
    --accent-warning: #ffcc00;
    --text-main: #edf6ff;
    --text-dim: #8aa4c0;
    --tank-frame: #324152;
    --water-base: #00B2FF;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: radial-gradient(circle at top center, #1a2738 0%, var(--bg-dark) 80%);
    padding: 25px; color: var(--text-main); min-height: 100vh;
}
.dashboard { max-width: 1450px; margin: auto; }
h1 {
    font-weight: 200; font-size: 2rem; margin-bottom: 30px;
    display: flex; justify-content: space-between; align-items: center;
}
h1 strong { font-weight: 700; color: var(--accent-blue); }
.badge-count {
    background: rgba(0, 180, 255, 0.1); color: var(--accent-blue);
    border: 1px solid rgba(0, 180, 255, 0.3);
    padding: 6px 18px; border-radius: 30px; font-size: 0.9rem;
}
.toolbar {
    display: flex; justify-content: space-between; align-items: center;  margin-bottom: 35px;
    background: var(--card-bg); padding: 15px 25px; border-radius: 10px;
    border: 1px solid var(--border-color);
}
.device-selector {
    background: var(--bg-dark); border: 1px solid var(--border-color);
    padding: 10px 20px; border-radius: 8px; color: var(--text-main);
    outline: none; cursor: pointer; transition: 0.3s;
}
.device-selector:hover { border-color: var(--accent-blue); }
.device-selector:disabled { opacity: 0.3; cursor: not-allowed; filter: grayscale(1); }         
.main-container { display: flex; flex-wrap: wrap; gap: 40px; }
.tank-visual-col {
    flex: 1; min-width: 380px;
    background: var(--card-bg); padding: 35px;
    border-radius: 10px; border: 1px solid var(--border-color);
    display: flex; flex-direction: column; align-items: center;
}
.tank-header-info { width: 100%; display: flex; justify-content: space-between; margin-bottom: 30px; }
.device-title { font-size: 1.5rem; font-weight: 700; }
.tank-wrapper { display: flex; height: 400px; gap: 20px; width: 100%; justify-content: center; }
.external-scale { width: 50px; display: flex; flex-direction: column; justify-content: space-between; padding: 5px 0; }
.scale-tick { font-size: 0.8rem; color: var(--text-dim); text-align: right; }
.scale-tick.major { color: var(--text-main); font-weight: 600; }
.tank-frame-pro {
    width: 350px; position: relative; background: rgba(0,0,0,0.4);
    border: 5px solid var(--tank-frame); border-radius: 20px 20px 70px 70px;
    overflow: hidden; box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
}
.tank-frame-pro::after {
    content: ""; position: absolute; top: 0; left: 0px; width: 30%; height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 50%, transparent 100%);
    pointer-events: none; z-index: 5;
}        
.liquid-container { position: absolute; bottom: 0; left: 0; width: 100%; height: 0%; transition: height 1.5s ease-in-out; }
.liquid-fill { position: absolute; bottom: 0; width: 100%; height: 100%; background: var(--water-base); }
.wave-top {
    position: absolute; top: -17px; width: 700px;
    animation: swell 2s linear infinite; fill: var(--accent-blue);
}
@keyframes swell { 
    0% { transform: translateX(-50%); } 
    100% { transform: translateX(0%); } 
}        
.main-percentage-box { margin-top: 35px; text-align: center; width: 100%; }
.big-number { font-size: 4.5rem; font-weight: 800; color: #fff; line-height: 1; }
.big-unit { font-size: 1.8rem; color: var(--accent-blue); margin-left: 5px; }
.warning-text { 
    color: var(--accent-danger); font-weight: 700; margin-top: 10px; 
    font-size: 1.1rem; display: none; letter-spacing: 1px; animation: blink 1s infinite;
}
@keyframes blink { 50% { opacity: 0.5; } }
.status-pill { padding: 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 300; text-transform: uppercase; }
.status-online { background: rgba(63, 224, 109, 0.15); color: #3fe06d; }
.status-offline { background: rgba(255, 51, 51, 0.15); color: #ff3333; animation: blink 1s infinite; }
.data-panel-col { flex: 1.5; min-width: 400px; display: flex; flex-direction: column; gap: 30px; }
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 15px; }
.metric-card { background: var(--card-bg); border: 1px solid var(--border-color); padding: 15px; border-radius: 12px; }
.metric-card h4 { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; margin-bottom: 8px; }
.metric-card .value { font-size: 1.2rem; font-weight: 700; color: #fff; }
.history-container { 
    background: var(--card-bg); border-radius: 10px; padding: 20px; 
    border: 1px solid var(--border-color); overflow-x: auto;
}
table { width: 100%; border-collapse: collapse; margin-top: 15px; min-width: 500px; }
th { text-align: left; color: var(--text-dim); font-size: 0.75rem; padding: 12px 10px; border-bottom: 2px solid var(--border-color); text-transform: uppercase; }
td { padding: 12px 10px; border-bottom: 1px solid var(--border-color); font-size: 0.85rem; }
.filter-btn {
    background: var(--border-color);
    border: 1px solid transparent;
    color: var(--text-main);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: 0.2s;
}
.filter-btn:hover { background: var(--tank-frame); }
.filter-btn.active {
    background: var(--accent-blue);
    color: var(--bg-dark);
    font-weight: bold;
}
.chart-wrapper {
    position: relative;
    height: 350px;
    width: 100%;
}
/* AJUSTE PARA ZOOM MÓVIL (Touch Action) */
#trendChart {
    touch-action: none;
    cursor: grab;
    user-select: none;
    -webkit-user-drag: none;
}
#trendChart:active { cursor: grabbing; }
.no-data-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(22, 31, 43, 0.8);
    border: 1px dashed var(--border-color);
    border-radius: 12px;
    color: var(--text-dim);
    z-index: 10;
}
@media (max-width: 768px) {
    body { padding: 15px; }
    .main-container { flex-direction: column; gap: 25px; }
    .tank-visual-col, .data-panel-col { min-width: unset; width: 100%; }
    .tank-wrapper { height: 320px; }
    .tank-frame-pro { width: 260px; }
    .wave-top { width: 700px; }
}
.chart-controls {
    display: flex; align-items: center; justify-content: space-between;
    gap: 25px; flex-wrap: wrap;
}
.filter-buttons { display: flex; gap: 10px; flex-wrap: wrap; }
.filter-date { display: flex; }
.date-input {
    background: var(--bg-dark); border: 1px solid var(--border-color);
    color: #fff; padding: 8px 14px; border-radius: 8px;
    font-size: 0.85rem; text-align: center;
}
.date-input::-webkit-calendar-picker-indicator { filter: invert(1); }
.compare-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 204, 0, 0.08);
    border: 1px solid rgba(255, 204, 0, 0.25);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.8rem;
    cursor: pointer;
    user-select: none;
}
.compare-toggle input { accent-color: var(--accent-warning); }
.compare-month-input { border-color: rgba(255, 204, 0, 0.35); }
.chart-legend { display: flex; gap: 20px; font-size: 0.75rem; font-weight: 700; }
.legend-critical { color: var(--accent-danger); }
.legend-level { color: var(--accent-blue); }
.legend-compare { color: var(--accent-warning); }
/* Indicador modo frozen */
.frozen-badge {
    display: none;
    background: rgba(255, 204, 0, 0.15);
    color: var(--accent-warning);
    border: 1px solid rgba(255, 204, 0, 0.3);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    animation: blink 2s infinite;
}
.frozen-badge.visible { display: inline-block; }
.chart-subtitle {
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-top: 4px;
}
@media (max-width: 768px) {
    .chart-controls { flex-direction: column; align-items: center; justify-content: center; width: 100%; }
    .filter-buttons, .filter-date, .chart-legend { width: 100%; display: flex; justify-content: center; }
    .chart-legend { text-align: center; flex-wrap: wrap; }
}

/* =========================================================================
   MODAL & AUTHENTICATION STYLES (Inspired by 192.168.100.220)
   ========================================================================= */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(10, 14, 20, 0.85); backdrop-filter: blur(5px);
    display: none; align-items: center; justify-content: center; z-index: 1000;
}
.modal-overlay.active { display: flex; }

.modal-content {
    background: #111820; border: 1px solid #1e2d3d; border-radius: 10px;
    padding: 24px; width: 100%; max-width: 400px; position: relative;
    color: #c8d8e8; font-family: 'Segoe UI', Arial, sans-serif;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    margin: 20px;
}
.modal-content.large { max-width: 600px; }
.modal-close {
    position: absolute; top: 15px; right: 15px; background: transparent;
    border: none; color: #6d8294; font-size: 20px; cursor: pointer; transition: 0.3s;
}
.modal-close:hover { color: #ff3b5c; }

/* Login Form Styles */
.modal-content h2 { font-size: 20px; color: #fff; margin-bottom: 6px; }
.modal-content p.subtitle { font-size: 13px; color: #6d8294; margin-bottom: 20px; }
.modal-content label { display: block; font-size: 12px; color: #6d8294; margin: 14px 0 6px; }
.modal-content input[type=text], .modal-content input[type=password], .modal-content input[type=email] {
    width: 100%; background: #0d131b; border: 1px solid #1e2d3d; border-radius: 8px;
    color: #c8d8e8; font-size: 15px; padding: 11px;
}
.modal-content input[type=text]:focus, .modal-content input[type=password]:focus, .modal-content input[type=email]:focus {
    border-color: #00d4ff; outline: none;
}
.modal-btn {
    width: 100%; border: 0; border-radius: 8px; padding: 12px;
    background: linear-gradient(90deg, #00d4ff, #00ff9d);
    color: #001014; font-weight: 700; cursor: pointer; margin-top: 15px; transition: opacity 0.3s;
}
.modal-btn:hover { opacity: 0.9; }
.modal-btn-danger {
    background: transparent; border: 1px solid #ff3b5c; color: #ff3b5c; margin-top: 10px;
}
.modal-btn-danger:hover { background: rgba(255,59,92,0.1); }
.modal-err { display: none; color: #ff3b5c; font-size: 13px; margin-top: 12px; text-align: center; }
.modal-success { display: none; color: #00ff9d; font-size: 13px; margin-top: 12px; text-align: center; }

/* Tabs for Config/Users */
.tabs { display: flex; border-bottom: 1px solid #1e2d3d; margin-bottom: 20px; }
.tab-btn {
    background: transparent; border: none; color: #6d8294; padding: 10px 15px;
    cursor: pointer; font-size: 14px; font-weight: 600; border-bottom: 2px solid transparent;
}
.tab-btn.active { color: #00d4ff; border-bottom-color: #00d4ff; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Range and Checkboxes */
.range-container { display: flex; align-items: center; gap: 15px; }
.range-container input[type=range] {
    flex: 1; accent-color: #00d4ff; cursor: pointer; height: 6px;
    background: #0d131b; border-radius: 5px; appearance: none;
}
.range-container input[type=range]::-webkit-slider-thumb {
    appearance: none; width: 16px; height: 16px; border-radius: 50%;
    background: #00d4ff; cursor: pointer;
}
.range-val { width: 50px; text-align: right; font-weight: bold; color: #fff; }

.check-container { display: flex; align-items: center; justify-content: space-between; margin: 15px 0; }
.check-container label { margin: 0; font-size: 14px; color: #c8d8e8; font-weight: 500; }
.switch { position: relative; display: inline-block; width: 40px; height: 20px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #0d131b; transition: .4s; border-radius: 34px; border: 1px solid #1e2d3d; }
.slider:before { position: absolute; content: ""; height: 14px; width: 14px; left: 3px; bottom: 2px; background-color: #6d8294; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: rgba(0,212,255,0.2); border-color: #00d4ff; }
input:checked + .slider:before { transform: translateX(18px); background-color: #00d4ff; }

/* Settings Button */
.settings-btn {
    background: var(--card-bg); border: 1px solid var(--border-color);
    color: var(--text-dim); border-radius: 8px; padding: 10px; cursor: pointer;
    display: flex; align-items: center; justify-content: center; transition: 0.3s;
}
.settings-btn:hover { border-color: var(--accent-blue); color: var(--accent-blue); }

/* Users Table */
.users-list { margin-bottom: 20px; max-height: 200px; overflow-y: auto; }
.user-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px; background: #0d131b; border: 1px solid #1e2d3d; border-radius: 6px; margin-bottom: 8px;
}
.user-item-info strong { color: #fff; display: block; font-size: 14px; }
.user-item-info span { color: #6d8294; font-size: 12px; }
.user-item-actions button { background: transparent; border: none; cursor: pointer; font-size: 16px; padding: 5px; }
.btn-edit-user { color: #00d4ff; }
.btn-del-user { color: #ff3b5c; }