:root {
    --bg: #0b0d12;
    --card: #11151c;
    --card-hover: #151b24;
    --muted: #8891a7;
    --text: #e8edf7;
    --primary: #0b6cff;
    --primary-2: #4c8dff;
    --ok: #22c55e;
    --warn: #f59e0b;
    --err: #ef4444;
    --border: #1c2330;
    --inset: #0a0f16;
    --radius: 16px;
    --shadow: 0 6px 24px rgba(0, 0, 0, .35);
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--bg);
}

body {
    margin: 0;
    min-height: 100vh;
    min-height: 100dvh;
    font: 14px/1.4 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
    background:
        radial-gradient(circle at 50% -20%, rgba(76, 141, 255, .08), transparent 34rem),
        var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

button,
input {
    font: inherit;
}

button {
    -webkit-tap-highlight-color: transparent;
}

.app {
    min-height: 100vh;
    min-height: 100dvh;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.muted {
    color: var(--muted);
}

.eyebrow {
    margin: 0 0 .2rem;
    color: var(--muted);
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: .16em;
}

.pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 28px;
    padding: .25rem .65rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--inset);
    color: var(--muted);
    font-size: .75rem;
    white-space: nowrap;
}

/* ---------- Botones ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    min-height: 44px;
    padding: .7rem .95rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--inset);
    color: var(--text);
    cursor: pointer;
    text-decoration: none;
    user-select: none;
    transition: transform .15s ease, border-color .15s ease, background .15s ease, opacity .15s ease;
}

.btn:hover {
    border-color: #2c3749;
}

.btn:active {
    transform: translateY(1px);
}

.btn:focus-visible,
.selector-card:focus-visible {
    outline: 3px solid rgba(76, 141, 255, .3);
    outline-offset: 2px;
}

.btn.primary {
    border-color: transparent;
    background: linear-gradient(180deg, var(--primary-2), var(--primary));
    color: #fff;
    font-weight: 700;
}

.btn.ghost {
    background: transparent;
}

.btn-block {
    width: 100%;
}

.btn-compact {
    min-height: 38px;
    padding: .5rem .8rem;
}

.btn[disabled] {
    cursor: default;
    opacity: .55;
}

/* ---------- Login ---------- */

.login-page {
    min-height: 100vh;
    min-height: 100dvh;
    display: grid;
    place-items: center;
    padding: 1.2rem;
}

.login-card {
    width: min(460px, 100%);
    padding: clamp(1.25rem, 4vw, 2rem);
}

.login-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.login-heading h1 {
    margin: 0;
    font-size: clamp(1.65rem, 6vw, 2.15rem);
    letter-spacing: -.025em;
}

.login-copy {
    margin: .75rem 0 1.35rem;
}

.login-form {
    display: grid;
    gap: 1rem;
}

.field {
    display: flex;
    flex-direction: column;
    gap: .42rem;
}

.label {
    color: var(--muted);
    font-size: .78rem;
    font-weight: 600;
}

.input {
    width: 100%;
    min-height: 46px;
    padding: .8rem .9rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    outline: none;
    background: var(--inset);
    color: var(--text);
    transition: border-color .15s ease, box-shadow .15s ease;
}

.input::placeholder {
    color: #596276;
}

.input:focus {
    border-color: var(--primary-2);
    box-shadow: 0 0 0 3px rgba(11, 108, 255, .22);
}

.remember-row {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    width: fit-content;
    color: var(--muted);
    font-size: .82rem;
    cursor: pointer;
    user-select: none;
}

.remember-row input {
    accent-color: var(--primary);
}

.form-message {
    min-height: 1.3em;
    margin: 0;
    color: var(--muted);
    font-size: .82rem;
}

.form-message.error {
    color: var(--err);
}

.form-message.success {
    color: var(--ok);
}

/* ---------- Barra superior ---------- */

.appbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: .75rem;
    min-height: 68px;
    padding: .75rem clamp(.8rem, 3vw, 1.25rem);
    border-bottom: 1px solid var(--border);
    background: rgba(17, 21, 28, .92);
    backdrop-filter: saturate(1.2) blur(8px);
}

.brand {
    font-size: 1rem;
    font-weight: 750;
    letter-spacing: .01em;
}

.spacer {
    flex: 1;
}

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

.dashboard {
    width: min(1400px, 100%);
    margin: 0 auto;
    padding: clamp(.75rem, 2.2vw, 1.25rem);
}

.summary-grid {
    display: grid;
    grid-template-columns: minmax(150px, .85fr) minmax(210px, 1.35fr) minmax(190px, 1fr);
    gap: clamp(.55rem, 1.4vw, .9rem);
}

.summary-card {
    position: relative;
    min-height: 132px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    text-align: center;
}

.summary-label,
.summary-caption {
    color: var(--muted);
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: .13em;
}

.summary-value {
    margin: .2rem 0;
    font-size: clamp(2.15rem, 5vw, 3.25rem);
    line-height: 1;
}

.status-value {
    max-width: 100%;
    margin: .3rem 0;
    font-size: clamp(1.4rem, 4vw, 2.15rem);
    line-height: 1.1;
    overflow-wrap: anywhere;
}

.status-card.status-ok {
    border-color: rgba(34, 197, 94, .32);
    background:
        linear-gradient(180deg, rgba(34, 197, 94, .07), transparent 72%),
        var(--card);
}

.status-card.status-ok .status-value {
    color: var(--ok);
}

.status-card.status-alert {
    border-color: rgba(239, 68, 68, .34);
    background:
        linear-gradient(180deg, rgba(239, 68, 68, .075), transparent 72%),
        var(--card);
}

.status-card.status-alert .status-value {
    color: var(--err);
}

.selector-card {
    appearance: none;
    width: 100%;
    border: 1px solid var(--border);
    color: var(--text);
    cursor: pointer;
    font: inherit;
    transition: transform .15s ease, background .15s ease, border-color .15s ease;
}

.selector-card:hover {
    background: var(--card-hover);
    border-color: #2c3749;
}

.selector-card:active {
    transform: scale(.985);
}

.selector-value {
    max-width: calc(100% - 1.25rem);
    margin-top: .25rem;
    font-size: clamp(1rem, 3vw, 1.35rem);
    line-height: 1.1;
}

.selector-subtitle {
    max-width: calc(100% - 1.25rem);
    margin-top: .3rem;
    color: var(--muted);
    font-size: .75rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.selector-arrow {
    position: absolute;
    right: .8rem;
    top: 50%;
    translate: 0 -50%;
    color: var(--muted);
    font-size: 1.7rem;
    line-height: 1;
}

/* ---------- Área de visualización ---------- */

.visualization-shell {
    margin-top: clamp(.65rem, 1.6vw, 1rem);
    padding: clamp(1rem, 2.4vw, 1.35rem);
}

.visualization-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.visualization-heading h2 {
    margin: 0;
    font-size: clamp(1.1rem, 3vw, 1.45rem);
}

.visualization-area {
    min-height: clamp(380px, 58vh, 720px);
    display: grid;
    place-items: center;
    padding: 1rem;
}

.visualization-placeholder {
    width: min(560px, 100%);
    padding: 1.5rem;
    border: 1px dashed #293246;
    border-radius: calc(var(--radius) - 2px);
    background: rgba(10, 15, 22, .42);
    color: var(--muted);
    text-align: center;
}

.visualization-placeholder p {
    max-width: 42ch;
    margin: .8rem auto 0;
}

.placeholder-symbol {
    color: #43506a;
    font-size: 2.4rem;
    line-height: 1;
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
    .dashboard {
        padding: .65rem;
    }

    .summary-grid {
        grid-template-columns: minmax(78px, .8fr) minmax(108px, 1.15fr) minmax(105px, 1.05fr);
        gap: .45rem;
    }

    .summary-card {
        min-height: 108px;
        padding: .65rem .45rem;
        border-radius: 13px;
    }

    .summary-label,
    .summary-caption {
        font-size: .56rem;
        letter-spacing: .09em;
    }

    .summary-value {
        font-size: 2rem;
    }

    .status-value {
        font-size: 1.15rem;
    }

    .selector-value {
        font-size: .9rem;
    }

    .selector-subtitle {
        max-width: calc(100% - .8rem);
        font-size: .63rem;
    }

    .selector-arrow {
        right: .3rem;
        font-size: 1.2rem;
    }

    .visualization-shell {
        margin-top: .55rem;
        padding: .8rem;
        border-radius: 13px;
    }

    .visualization-area {
        min-height: 56vh;
        padding: .65rem 0;
    }

    .visualization-placeholder {
        padding: 1.1rem;
    }
}

@media (max-width: 380px) {
    .summary-grid {
        grid-template-columns: minmax(74px, .78fr) minmax(102px, 1.15fr) minmax(100px, 1.07fr);
    }

    .summary-card {
        min-height: 102px;
    }

    .status-value {
        font-size: 1.02rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
    }
}

/* ============================================================
   DIAGRAMA SVG DEL SISTEMA
   ============================================================ */

.process-view {
    width: min(1180px, 100%);
    margin: 0 auto;
}

.process-svg {
    display: block;
    width: 100%;
    height: auto;
    max-height: 70vh;
    min-height: 390px;
    overflow: visible;
}

.process-base {
    transition: opacity .25s ease, filter .25s ease;
}

.process-svg.has-selection .process-base {
    opacity: .36;
    filter: saturate(.65);
}

.equipment-label,
.pipe-label,
.burner-label {
    fill: var(--muted);
    font-family: inherit;
    font-weight: 700;
    letter-spacing: .08em;
}

.equipment-label {
    font-size: 18px;
}

.equipment-label-main {
    fill: var(--text);
    font-size: 21px;
}

.pipe-label {
    font-size: 15px;
}

.pipe-label-strong {
    fill: #aeb9cf;
}

.tank-shell,
.boiler-shell,
.diesel-shell,
.burner-shell {
    stroke: #334055;
    stroke-width: 4;
}

.tank-shell {
    fill: url(#tank-fill);
}

.boiler-shell {
    fill: url(#boiler-fill);
    stroke: #3a485f;
    stroke-width: 5;
}

.diesel-shell {
    fill: #121923;
}

.burner-shell {
    fill: #0b1119;
    stroke-width: 3;
}

.boiler-detail {
    stroke: #2b3749;
    stroke-width: 3;
    opacity: .75;
}

.water-fill {
    fill: rgba(76, 141, 255, .28);
}

.treated-water-fill {
    fill: rgba(75, 190, 205, .24);
}

.diesel-fill {
    fill: rgba(245, 158, 11, .27);
}

.liquid-line {
    fill: none;
    stroke: rgba(138, 180, 255, .58);
    stroke-width: 4;
    stroke-linecap: round;
}

.burner-flame {
    fill: rgba(245, 158, 11, .85);
    stroke: rgba(255, 193, 7, .7);
    stroke-width: 2;
}

.burner-label {
    font-size: 13px;
}

.process-pipe {
    fill: none;
    stroke: #56647a;
    stroke-width: 7;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.steam-pipe {
    stroke: #68788f;
}

.diesel-pipe {
    stroke: #5f5b52;
}

.flow-arrow-shape {
    fill: #75849a;
}

/* ---------- Indicadores activos ---------- */

.sensor-node {
    cursor: pointer;
    outline: none;
    transform-box: fill-box;
    transform-origin: center;
    transition: opacity .2s ease, filter .2s ease;
}

.sensor-hit-area {
    fill: transparent;
    pointer-events: all;
}

.sensor-badge-bg,
.sensor-compact-bg {
    fill: rgba(10, 15, 22, .96);
    stroke: #344158;
    stroke-width: 2.5;
    transition: stroke .2s ease, fill .2s ease, filter .2s ease;
}

.sensor-code,
.sensor-state-text {
    fill: var(--text);
    font-family: inherit;
    pointer-events: none;
    user-select: none;
}

.sensor-code {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: .04em;
}

.sensor-code-compact {
    font-size: 17px;
}

.sensor-state-text {
    fill: var(--muted);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .055em;
}

.sensor-state-dot {
    stroke: rgba(255, 255, 255, .72);
    stroke-width: 2;
    transition: fill .2s ease;
}

.sensor-node.is-normal .sensor-state-dot {
    fill: var(--ok);
}

.sensor-node.is-alarm .sensor-state-dot {
    fill: var(--err);
}

.sensor-node.is-unknown .sensor-state-dot {
    fill: #64748b;
}

.sensor-node.is-normal .sensor-badge-bg,
.sensor-node.is-normal .sensor-compact-bg {
    stroke: rgba(34, 197, 94, .48);
}

.sensor-node.is-alarm .sensor-badge-bg,
.sensor-node.is-alarm .sensor-compact-bg {
    stroke: rgba(239, 68, 68, .72);
    filter: drop-shadow(0 0 8px rgba(239, 68, 68, .22));
}

.sensor-node.is-unknown .sensor-badge-bg,
.sensor-node.is-unknown .sensor-compact-bg {
    stroke: rgba(100, 116, 139, .62);
}

.sensor-node:hover .sensor-badge-bg,
.sensor-node:hover .sensor-compact-bg,
.sensor-node:focus-visible .sensor-badge-bg,
.sensor-node:focus-visible .sensor-compact-bg {
    stroke: var(--primary-2);
    filter: drop-shadow(0 0 9px rgba(76, 141, 255, .28));
}

.process-svg.has-selection .sensor-node:not(.is-selected) {
    opacity: .25;
    filter: saturate(.5);
}

.sensor-node.is-selected .sensor-badge-bg,
.sensor-node.is-selected .sensor-compact-bg {
    stroke: var(--primary-2);
    stroke-width: 4;
    filter: drop-shadow(0 0 13px rgba(76, 141, 255, .45));
}

.sensor-node.is-selected .sensor-badge-full,
.sensor-node.is-selected .sensor-badge-compact {
    transform: scale(1.11);
    transform-origin: center;
    transform-box: fill-box;
}

.sensor-node.is-alarm:not(.is-selected) .sensor-state-dot {
    animation: sensor-alarm-pulse 1.35s ease-in-out infinite;
}

.sensor-badge-compact {
    display: none;
}

/* ---------- Leyenda ---------- */

.process-legend {
    display: flex;
    justify-content: center;
    gap: .75rem 1.2rem;
    flex-wrap: wrap;
    margin-top: .3rem;
    padding: .65rem .8rem;
    color: var(--muted);
    font-size: .75rem;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
}

.legend-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, .06);
}

.legend-dot.normal {
    background: var(--ok);
}

.legend-dot.alarm {
    background: var(--err);
}

.legend-dot.unknown {
    background: #64748b;
}

.status-card.status-unknown {
    border-color: rgba(100, 116, 139, .45);
    background:
        linear-gradient(180deg, rgba(100, 116, 139, .07), transparent 72%),
        var(--card);
}

.status-card.status-unknown .status-value {
    color: #94a3b8;
}

@keyframes sensor-alarm-pulse {
    0%, 100% {
        opacity: 1;
        r: 7px;
    }
    50% {
        opacity: .48;
        r: 10px;
    }
}

@media (max-width: 720px) {
    .visualization-area {
        overflow-x: auto;
        place-items: start center;
    }

    .process-view {
        min-width: 0;
    }

    .process-svg {
        min-height: 0;
        max-height: none;
    }

    .sensor-badge-full {
        display: none;
    }

    .sensor-badge-compact {
        display: block;
    }

    .equipment-label {
        font-size: 16px;
    }

    .equipment-label-main {
        font-size: 19px;
    }

    .pipe-label {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .visualization-shell {
        overflow: hidden;
    }

    .visualization-area {
        padding-left: 0;
        padding-right: 0;
    }

    .process-legend {
        font-size: .68rem;
        gap: .55rem .9rem;
    }
}