/* ════════════════════════════════════════════════════
   RESET Y BASE
════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background-color: #0f0f0f;
    color: #d8d8d8;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.45;
    min-height: 100vh;
    overflow: hidden;
}

/* ════════════════════════════════════════════════════
   LAYOUT PRINCIPAL
════════════════════════════════════════════════════ */
.app-container {
    display: grid;
    grid-template-columns: 370px 1fr;
    height: 100vh;
    width: 100vw;
}

/* ════════════════════════════════════════════════════
   PANEL DE CONTROL (SIDEBAR)
════════════════════════════════════════════════════ */
.control-panel {
    background-color: #181818;
    border-right: 1px solid #272727;
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
    height: 100vh;
    z-index: 2;
}

/* Prevent flex children from shrinking — required for overflow-y scroll to work */
.control-panel > * { flex-shrink: 0; }

/* Scrollbar */
.control-panel::-webkit-scrollbar { width: 7px; }
.control-panel::-webkit-scrollbar-thumb { background: #404040; border-radius: 4px; }
.control-panel::-webkit-scrollbar-thumb:hover { background: #555; }
.control-panel::-webkit-scrollbar-track { background: #141414; border-radius: 4px; }

/* ── Header ───────────────────────────────────────── */
header {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

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

.header-icon-svg {
    flex-shrink: 0;
    display: block;
}

.header-top h1 {
    font-size: 1.2rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -0.3px;
    line-height: 1.2;
}

/* Desplegable del encabezado */
.header-details {
    margin-top: 2px;
}

.header-details summary {
    font-size: 0.72rem;
    font-weight: 600;
    color: #848484;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 5px;
    user-select: none;
    padding: 2px 0;
}
.header-details summary::-webkit-details-marker { display: none; }
.header-details summary::before {
    content: '▶';
    font-size: 0.58rem;
    color: #444;
    transition: transform 0.18s ease;
    display: inline-block;
}
.header-details[open] summary::before {
    transform: rotate(90deg);
    color: #00c8ff;
}
.header-details[open] summary {
    color: #888;
}

.header-details-body {
    display: flex;
    flex-direction: column;
    gap: 7px;
    padding-top: 6px;
}

.subtitle {
    font-size: 0.78rem;
    color: #00c8ff;
    font-weight: 600;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.section-note {
    font-size: 0.80rem;
    color: #888;
    margin-top: 4px;
    line-height: 1.5;
}

/* Regla rápida mnemónica */
.quick-rule {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-top: 6px;
}

.quick-rule span {
    font-size: 0.74rem;
    font-family: monospace;
    padding: 3px 8px;
    border-radius: 5px;
    display: block;
}

.qr-solid  { color: #8aa8ff; background: #10162a; border: 1px solid #26345a; }
.qr-liquid { color: #3ccf9a; background: #0b1f18; border: 1px solid #1a4034; }
.qr-gas    { color: #ff9a4a; background: #1f140b; border: 1px solid #40291a; }

/* ── Divisor ──────────────────────────────────────── */
.divider { border: 0; height: 1px; background: #252525; }

/* ── Selector de modo ─────────────────────────────── */
.mode-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    background: #141414;
    padding: 4px;
    border: 1px solid #272727;
    border-radius: 9px;
}

.mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    background: transparent;
    border: 1px solid transparent;
    color: #888;
    padding: 8px 6px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 700;
    transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.mode-btn .mode-sub {
    font-size: 0.64rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #828282;
}

.mode-btn:hover { color: #c0c0c0; }

.mode-btn.active {
    background: #0e2230;
    border-color: #00c8ff55;
    color: #00c8ff;
}
.mode-btn.active .mode-sub { color: #4f93aa; }

/* Visibilidad según el modo activo */
body.mode-curva .only-fases { display: none; }
body.mode-fases .only-curva { display: none; }

/* ── Grupo de controles ───────────────────────────── */
.control-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

h2 {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1.8px;
    color: #00c8ff;
    font-weight: 700;
}

/* ── Inputs ───────────────────────────────────────── */
.input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.label-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

label { font-size: 0.83rem; color: #c0c0c0; }

.label-hint {
    font-size: 0.72rem;
    color: #858585;
    font-weight: 400;
}

.value-badge {
    background-color: #202020;
    color: #00c8ff;
    padding: 2px 7px;
    border-radius: 5px;
    font-family: monospace;
    font-weight: 700;
    font-size: 0.82rem;
    white-space: nowrap;
}

.slider-bounds {
    display: flex;
    justify-content: space-between;
    font-size: 0.70rem;
    color: #848484;
}

/* Slider estilizado con pista de relleno */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 7px;
    border-radius: 999px;
    background: linear-gradient(
        to right,
        #00c8ff90 0%,
        #00c8ff90 var(--fill, 40%),
        #1e1e1e var(--fill, 40%)
    );
    outline: none;
    cursor: pointer;
    transition: background 0.1s;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 17px; height: 17px;
    border-radius: 50%;
    background: #00c8ff;
    border: 2.5px solid #111;
    cursor: pointer;
    box-shadow: 0 0 6px #00c8ff66;
}
input[type="range"]::-moz-range-thumb {
    width: 17px; height: 17px;
    border-radius: 50%;
    background: #00c8ff;
    border: 2.5px solid #111;
    cursor: pointer;
}
input[type="range"]:disabled { cursor: not-allowed; }

/* Select */
.custom-select {
    background-color: #202020;
    border: 1px solid #2e2e2e;
    color: #e0e0e0;
    padding: 9px 11px;
    border-radius: 7px;
    font-size: 0.88rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}
.custom-select:hover { border-color: #00c8ff55; }
.custom-select optgroup { color: #888; font-style: normal; }
.custom-select option  { color: #e0e0e0; background: #1e1e1e; }

.field-hint {
    font-size: 0.73rem;
    color: #858585;
    line-height: 1.45;
}

/* ════════════════════════════════════════════════════
   MÉTRICAS EN TIEMPO REAL
════════════════════════════════════════════════════ */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 7px;
}

.card {
    background-color: #1e1e1e;
    border: 1px solid #2a2a2a;
    border-radius: 9px;
    padding: 10px 11px;
}

.card.card-data {
    background: linear-gradient(140deg, #1c2836 0%, #141d28 100%);
    border-color: #263040;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.04), 0 3px 8px rgba(0,0,0,0.30);
}

.card h3 {
    font-size: 0.68rem;
    color: #7a8b9b;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 5px;
}

.metric {
    font-size: 1.25rem;
    font-weight: 700;
    color: #e8e8e8;
    font-family: monospace;
    line-height: 1.1;
    white-space: nowrap;
}

.metric small {
    font-size: 0.70rem;
    color: #4a5a6a;
    font-weight: 400;
}

/* Tarjeta de estado del sistema */
.card-estado {
    background: linear-gradient(135deg, #1a2030 0%, #141820 100%);
    border-color: #00c8ff33;
    border-left: 3px solid #00c8ff55;
    padding: 10px 14px;
    margin-top: 2px;
}

.estado-value {
    font-size: 0.78rem;
    font-weight: 700;
    font-family: monospace;
    color: #00c8ff;
    display: block;
    text-align: center;
    line-height: 1.2;
    transition: color 0.4s ease;
}


.card-estado h3 { text-align: center; }
.estado-value { font-size: 0.95rem; }

/* Colores de estado (los mismos que en el canvas) */
.estado-value.st-solid  { color: #8aa8ff; }
.estado-value.st-liquid { color: #3ccf9a; }
.estado-value.st-gas    { color: #ff9a4a; }
.estado-value.st-change { color: #ffd24a; }

.metric-text {
    font-size: 0.92rem;
    font-family: system-ui, sans-serif;
    padding-top: 3px;
}
.metric-text.hot  { color: #ff7a5a; }
.metric-text.cold { color: #6ab8ff; }

/* ════════════════════════════════════════════════════
   DESLIZADOR DE POTENCIA (centrado en 0)
════════════════════════════════════════════════════ */
input[type="range"].power-slider,
body.theme-light input[type="range"].power-slider,
body.theme-contrast input[type="range"].power-slider {
    background: linear-gradient(
        to right,
        var(--track) 0%,
        var(--track) var(--from, 50%),
        var(--pc, #ff5a5a) var(--from, 50%),
        var(--pc, #ff5a5a) var(--to, 75%),
        var(--track) var(--to, 75%)
    );
}
input[type="range"].power-slider { --track: #1e1e1e; }
.bound-cold { color: #6ab8ff; }
.bound-hot  { color: #ff7a5a; }

/* ════════════════════════════════════════════════════
   ENERGÍA: SUBIR LA TEMPERATURA / SEPARAR PARTÍCULAS
════════════════════════════════════════════════════ */
.energy-card h3 { margin-bottom: 8px; }
.energy-bar {
    display: flex;
    height: 14px;
    border-radius: 7px;
    overflow: hidden;
    background: #151515;
    border: 1px solid #2a2a2a;
}
.energy-seg { height: 100%; transition: width 0.25s ease; }
.seg-sensible, .dot-sensible { background: #ff6a4a; }
.seg-latente,  .dot-latente  { background: #ffd24a; }
.energy-legend {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-top: 8px;
    font-size: 0.76rem;
    color: #a0a0a0;
}
.energy-legend b { font-family: monospace; color: #e0e0e0; margin-left: 4px; }
.dot {
    display: inline-block;
    width: 9px; height: 9px;
    border-radius: 50%;
    margin-right: 6px;
}

/* Ideas clave */
.key-ideas {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 7px;
    font-size: 0.80rem;
    color: #a8a8a8;
    line-height: 1.5;
}
.key-ideas li {
    padding-left: 12px;
    border-left: 2px solid #00c8ff55;
}
.key-ideas strong { color: #e0e0e0; }
.formula .formula-name { min-width: 138px; }

body.theme-light .energy-bar { background: #ccd4e0; border-color: #b0bcd0; }
body.theme-light .seg-sensible, body.theme-light .dot-sensible { background: #d8482a; }
body.theme-light .seg-latente,  body.theme-light .dot-latente  { background: #d8a200; }
body.theme-light .energy-legend   { color: #4a5a6a; }
body.theme-light .energy-legend b { color: #0d1520; }
body.theme-light .key-ideas       { color: #3a4a5a; }
body.theme-light .key-ideas li    { border-left-color: #0088bb66; }
body.theme-light .key-ideas strong { color: #0d1520; }

body.theme-contrast .energy-bar { background: #000; border: 1.5px solid #ffff00; }
body.theme-contrast .seg-sensible, body.theme-contrast .dot-sensible { background: #ff5533; }
body.theme-contrast .seg-latente,  body.theme-contrast .dot-latente  { background: #ffff00; }
body.theme-contrast .energy-legend   { color: #ffffff; }
body.theme-contrast .energy-legend b { color: #00ffff; }
body.theme-contrast .key-ideas       { color: #ffffff; }
body.theme-contrast .key-ideas li    { border-left-color: #00ffff; }
body.theme-contrast .key-ideas strong { color: #ffff00; }

/* ════════════════════════════════════════════════════
   MODO DIAGRAMA DE FASES
════════════════════════════════════════════════════ */
.metrics-grid-2 { grid-template-columns: repeat(2, 1fr); }

.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}
.preset-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    text-align: left;
    background: #1c1c1c;
    border: 1px solid #2e2e2e;
    color: #d0d0d0;
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.80rem;
    font-weight: 700;
    font-family: system-ui, sans-serif;
    transition: background 0.18s, border-color 0.18s, color 0.18s;
}
.preset-btn small {
    font-size: 0.68rem;
    font-weight: 500;
    color: #8a8a8a;
    font-family: monospace;
}
.preset-btn:hover { border-color: #00c8ff55; color: #ffffff; }
.preset-btn.active { background: #0e2230; border-color: #00c8ff; color: #00c8ff; }

.at-pressure p {
    font-size: 0.82rem;
    line-height: 1.55;
    color: #c0c0c0;
}
.at-pressure strong { color: #ffffff; font-family: monospace; }

body.theme-light .preset-btn { background: #f5f6fa; border-color: #c8d0dc; color: #1a2a3a; }
body.theme-light .preset-btn small { color: #525e6a; }
body.theme-light .preset-btn:hover { border-color: #0088bb88; }
body.theme-light .preset-btn.active { background: #c8dcee; border-color: #0088bb; color: #005a88; }
body.theme-light .at-pressure p { color: #2a3a4a; }
body.theme-light .at-pressure strong { color: #0d1520; }

body.theme-contrast .preset-btn { background: #000; border: 1.5px solid #ffff00; color: #ffffff; }
body.theme-contrast .preset-btn small { color: #cccccc; }
body.theme-contrast .preset-btn:hover { border-color: #00ffff; }
body.theme-contrast .preset-btn.active { background: #001a1a; border-color: #00ffff; color: #00ffff; }
body.theme-contrast .at-pressure p { color: #ffffff; }
body.theme-contrast .at-pressure strong { color: #00ffff; }

/* ════════════════════════════════════════════════════
   CASILLAS DE VERIFICACIÓN
════════════════════════════════════════════════════ */
.check-row {
    display: flex;
    align-items: center;
    gap: 9px;
    cursor: pointer;
    font-size: 0.83rem;
}
.check-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: #00c8ff;
    cursor: pointer;
    flex-shrink: 0;
}
body.theme-light .check-row input[type="checkbox"]    { accent-color: #0088bb; }
body.theme-contrast .check-row input[type="checkbox"] { accent-color: #00ffff; }

/* ════════════════════════════════════════════════════
   CONTROL SEGMENTADO (velocidad)
════════════════════════════════════════════════════ */
.seg-control {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    background: #141414;
    padding: 3px;
    border: 1px solid #272727;
    border-radius: 8px;
}
.seg-btn {
    background: transparent;
    border: 1px solid transparent;
    color: #888;
    padding: 5px 0;
    border-radius: 5px;
    cursor: pointer;
    font-family: monospace;
    font-size: 0.85rem;
    font-weight: 700;
    transition: background 0.18s, color 0.18s, border-color 0.18s;
}
.seg-btn:hover { color: #c0c0c0; }
.seg-btn.active {
    background: #0e2230;
    border-color: #00c8ff55;
    color: #00c8ff;
}

body.theme-light input[type="range"].power-slider { --track: #c8d0dc; }
body.theme-light .bound-cold { color: #1a6ab0; }
body.theme-light .bound-hot  { color: #c0402a; }
body.theme-light .metric-text.hot  { color: #c0402a; }
body.theme-light .metric-text.cold { color: #1a6ab0; }
body.theme-light .estado-value.st-solid  { color: #2a4ab0; }
body.theme-light .estado-value.st-liquid { color: #127652; }
body.theme-light .estado-value.st-gas    { color: #a4540f; }
body.theme-light .estado-value.st-change { color: #8a6000; }
body.theme-light .seg-control { background: #e8ecf4; border-color: #c8d0dc; }
body.theme-light .seg-btn { color: #5a6a7a; }
body.theme-light .seg-btn.active { background: #c8dcee; border-color: #006ea044; color: #00628e; }

body.theme-contrast input[type="range"].power-slider { --track: #111111; }
body.theme-contrast .bound-cold { color: #66ccff; }
body.theme-contrast .bound-hot  { color: #ff6644; }
body.theme-contrast .metric-text.hot  { color: #ff6644; }
body.theme-contrast .metric-text.cold { color: #66ccff; }
body.theme-contrast .estado-value.st-solid  { color: #88aaff; }
body.theme-contrast .estado-value.st-liquid { color: #00ff88; }
body.theme-contrast .estado-value.st-gas    { color: #ffaa00; }
body.theme-contrast .estado-value.st-change { color: #ffff00; }
body.theme-contrast .seg-control { background: #000; border: 1.5px solid #ffff00; }
body.theme-contrast .seg-btn { color: #cccccc; }
body.theme-contrast .seg-btn.active { background: #001a1a; border-color: #00ffff; color: #00ffff; }


/* ════════════════════════════════════════════════════
   BOTÓN DE TEMA (ENGRANAJE) Y PANEL
════════════════════════════════════════════════════ */
.theme-btn {
    position: absolute;
    bottom: 18px;
    right: 18px;
    z-index: 20;
    width: 38px;
    height: 38px;
    background: #1a2530;
    border: 1.5px solid #2a3d50;
    color: #7a91a1;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.35s ease;
}
.theme-btn:hover {
    background: #0e2230;
    border-color: #00c8ff44;
    color: #80a8c0;
    transform: rotate(35deg);
}
.theme-btn.active {
    border-color: #00c8ff;
    color: #00c8ff;
    transform: rotate(65deg);
}

.theme-panel {
    position: absolute;
    bottom: 66px;
    right: 18px;
    z-index: 20;
    background: #1a2530;
    border: 1.5px solid #2a3d50;
    border-radius: 10px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.55);
    opacity: 0;
    pointer-events: none;
    /* Cerrado: fuera del tabulador y de los lectores de pantalla */
    visibility: hidden;
    transform: translateY(6px);
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s linear 0.18s;
}
.theme-panel.open {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
    pointer-events: all;
    transform: translateY(0);
}

.theme-panel-title {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #7a8b9b;
    font-weight: 700;
    margin: 0;
}

.theme-options {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.theme-opt {
    display: flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 1px solid #2a3d50;
    color: #8a9aaa;
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.82rem;
    font-family: system-ui, sans-serif;
    white-space: nowrap;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.theme-opt:hover {
    background: #0e2230;
    border-color: #00c8ff44;
    color: #c0d8e8;
}
.theme-opt.active {
    background: #091a28;
    border-color: #00c8ff;
    color: #00c8ff;
}

.theme-swatch {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    flex-shrink: 0;
}
.dark-swatch     { background: #141414; border: 1.5px solid #555; }
.light-swatch    { background: #f0f2f5; border: 1.5px solid #aaa; }
.contrast-swatch { background: #000000; border: 1.5px solid #ffff00; }


/* ════════════════════════════════════════════════════
   TEMA CLARO
════════════════════════════════════════════════════ */
body.theme-light {
    background-color: #eef0f5;
    color: #1a2030;
}
body.theme-light .control-panel {
    background-color: #ffffff;
    border-right-color: #cdd2dc;
}
body.theme-light .control-panel::-webkit-scrollbar-thumb { background: #b0b8c8; }
body.theme-light .control-panel::-webkit-scrollbar-track { background: #e8ecf2; }
body.theme-light .card {
    background-color: #f5f6fa;
    border-color: #d0d5e0;
}
body.theme-light .card.card-data {
    background: linear-gradient(140deg, #e2e8f5 0%, #d8dff0 100%);
    border-color: #bfcae0;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.7), 0 2px 6px rgba(0,0,0,0.08);
}
body.theme-light .card.card-estado {
    background: linear-gradient(135deg, #dce5f5 0%, #d2dcee 100%);
    border-color: #0088bb44;
    border-left-color: #0088bb88;
}
body.theme-light .card h3           { color: #4a6080; }
body.theme-light .metric            { color: #0d1520; }
body.theme-light .metric small      { color: #6070a0; }
body.theme-light .estado-value      { color: #00628e; }
body.theme-light .simulation-panel  { background-color: #c8d4e0; }
body.theme-light #canvas-container canvas { box-shadow: 0 12px 36px rgba(0,0,0,0.22), 0 0 0 1px #a0aabb; }
body.theme-light .custom-details    { background-color: #f2f4f8; border-color: #cdd2dc; }
body.theme-light .custom-details summary { color: #5a6070; }
body.theme-light .custom-details summary::after { color: #586881; }
body.theme-light .details-content  { background-color: #eaecf2; border-top-color: #d0d5e0; }
body.theme-light .divider           { background: #d4d8e4; }
body.theme-light h2                 { color: #0077a0; }
body.theme-light .subtitle          { color: #0077a0; }
body.theme-light .header-top h1     { color: #0d1520; }
body.theme-light .section-note      { color: #5a6a7a; }
body.theme-light label              { color: #2a3a4a; }
body.theme-light .label-hint        { color: #627394; }
body.theme-light .value-badge       { background-color: #d8e2ee; color: #00628e; }
body.theme-light .slider-bounds     { color: #627394; }
body.theme-light .field-hint        { color: #627394; }
body.theme-light .custom-select     { background-color: #f8f9fc; border-color: #c8d0dc; color: #1a2030; }
body.theme-light .custom-select optgroup { color: #6a7a8a; }
body.theme-light .custom-select option   { background: #f5f6fa; color: #1a2030; }
body.theme-light .formula-name      { color: #5a7090; }
body.theme-light .formula-eq        { color: #0060a0; }
body.theme-light .formula           { border-bottom-color: #d0d5e0; }
body.theme-light .mode-switch       { background: #e8ecf4; border-color: #c8d0dc; }
body.theme-light .mode-btn          { color: #5a6a7a; }
body.theme-light .mode-btn .mode-sub { color: #586881; }
body.theme-light .mode-btn:hover    { color: #1a2a3a; }
body.theme-light .mode-btn.active   { background: #c8dcee; border-color: #006ea044; color: #00628e; }
body.theme-light .mode-btn.active .mode-sub { color: #3b6081; }
body.theme-light .header-details summary      { color: #707888; }
body.theme-light .header-details summary::before { color: #586881; }
body.theme-light .header-details[open] summary   { color: #4a6080; }
body.theme-light .header-details[open] summary::before { color: #00628e; }
body.theme-light .canvas-btn {
    background: #dde5f0;
    border-color: #a8b8cc;
    color: #2a4a6a;
}
body.theme-light .canvas-btn:hover {
    background: #c8d8ec;
    border-color: #0088bb44;
    color: #1a3a5a;
}
body.theme-light .canvas-btn.active,
body.theme-light .canvas-btn[aria-pressed="true"] {
    background: #b8d0e8;
    border-color: #0088bb;
    color: #0055aa;
    box-shadow: 0 0 12px #0088bb22;
}
body.theme-light .theme-btn {
    background: #dde5f0;
    border-color: #a8b8cc;
    color: #4a6a8a;
}
body.theme-light .theme-btn:hover    { background: #c8d8ec; border-color: #0088bb44; color: #1a3a5a; }
body.theme-light .theme-btn.active   { border-color: #0088bb; color: #0055aa; }
body.theme-light .theme-panel        { background: #dde5f0; border-color: #a8b8cc; box-shadow: 0 8px 24px rgba(0,0,0,0.15); }
body.theme-light .theme-panel-title  { color: #5a7090; }
body.theme-light .theme-opt          { border-color: #b8c8dc; color: #4a6080; }
body.theme-light .theme-opt:hover    { background: #c8d8ec; border-color: #0088bb44; color: #1a3a5a; }
body.theme-light .theme-opt.active   { background: #b0cce4; border-color: #0088bb; color: #003a70; }
body.theme-light input[type="range"] {
    background: linear-gradient(
        to right,
        #0088bb90 0%,
        #0088bb90 var(--fill, 40%),
        #c8d0dc var(--fill, 40%)
    );
}
body.theme-light input[type="range"]::-webkit-slider-thumb { background: #0088bb; border-color: #e8ecf4; }
body.theme-light input[type="range"]::-moz-range-thumb     { background: #0088bb; border-color: #e8ecf4; }
body.theme-light .qr-solid  { color: #2a4ab0; background: #e0e8fb; border-color: #a8b8e8; }
body.theme-light .qr-liquid { color: #127652; background: #daf0e6; border-color: #a0d8c0; }
body.theme-light .qr-gas    { color: #a4540f; background: #fdeedd; border-color: #e8c0a0; }


/* ════════════════════════════════════════════════════
   TEMA ALTO CONTRASTE
════════════════════════════════════════════════════ */
body.theme-contrast {
    background-color: #000000;
    color: #ffffff;
}
body.theme-contrast .control-panel {
    background-color: #000000;
    border-right: 2px solid #ffff00;
}
body.theme-contrast .control-panel::-webkit-scrollbar-thumb { background: #ffff00; }
body.theme-contrast .control-panel::-webkit-scrollbar-track { background: #000000; }
body.theme-contrast .card {
    background-color: #000000;
    border: 1.5px solid #ffff00;
}
body.theme-contrast .card.card-data {
    background: #000000;
    border-color: #ffff00;
    box-shadow: none;
}
body.theme-contrast .card.card-estado {
    background: #000000;
    border-color: #00ffff;
    border-left: 3px solid #00ffff;
}
body.theme-contrast .card h3           { color: #ffff00; }
body.theme-contrast .metric            { color: #ffffff; }
body.theme-contrast .metric small      { color: #00ffff; }
body.theme-contrast .estado-value      { color: #00ffff; }
body.theme-contrast .simulation-panel  { background-color: #000000; }
body.theme-contrast #canvas-container canvas { box-shadow: 0 0 0 2px #ffff00; }
body.theme-contrast .custom-details    { background-color: #000000; border: 1.5px solid #ffff00; }
body.theme-contrast .custom-details summary { color: #ffff00; }
body.theme-contrast .custom-details summary::after { color: #ffff00; }
body.theme-contrast .custom-details[open] summary::after { color: #00ffff; }
body.theme-contrast .details-content  { background-color: #0a0a0a; border-top-color: #ffff00; }
body.theme-contrast .divider           { background: #ffff00; height: 2px; }
body.theme-contrast h2                 { color: #00ffff; }
body.theme-contrast .subtitle          { color: #00ffff; }
body.theme-contrast .header-top h1     { color: #ffffff; }
body.theme-contrast .section-note      { color: #cccccc; }
body.theme-contrast label              { color: #ffffff; }
body.theme-contrast .label-hint        { color: #cccccc; }
body.theme-contrast .value-badge       { background-color: #000000; color: #00ffff; border: 1.5px solid #00ffff; }
body.theme-contrast .slider-bounds     { color: #cccccc; }
body.theme-contrast .field-hint        { color: #cccccc; }
body.theme-contrast .custom-select     { background-color: #000000; border: 1.5px solid #ffff00; color: #ffffff; }
body.theme-contrast .custom-select optgroup { color: #aaaaaa; }
body.theme-contrast .custom-select option   { background: #000000; color: #ffffff; }
body.theme-contrast .formula-name      { color: #ffff00; }
body.theme-contrast .formula-eq        { color: #00ffff; }
body.theme-contrast .formula           { border-bottom-color: #333300; }
body.theme-contrast .mode-switch       { background: #000000; border: 1.5px solid #ffff00; }
body.theme-contrast .mode-btn          { color: #cccccc; }
body.theme-contrast .mode-btn .mode-sub { color: #888888; }
body.theme-contrast .mode-btn:hover    { color: #ffffff; }
body.theme-contrast .mode-btn.active   { background: #001a00; border-color: #00ffff; color: #00ffff; }
body.theme-contrast .mode-btn.active .mode-sub { color: #00aaaa; }
body.theme-contrast .header-details summary      { color: #cccccc; }
body.theme-contrast .header-details summary::before { color: #ffff00; }
body.theme-contrast .header-details[open] summary   { color: #ffffff; }
body.theme-contrast .header-details[open] summary::before { color: #00ffff; }
body.theme-contrast .canvas-btn {
    background: #000000;
    border-color: #00ffff;
    color: #00ffff;
}
body.theme-contrast .canvas-btn:hover    { border-color: #ffffff; color: #ffffff; }
body.theme-contrast .canvas-btn.active,
body.theme-contrast .canvas-btn[aria-pressed="true"] {
    background: #001a1a;
    border-color: #00ffff;
    color: #00ffff;
    box-shadow: 0 0 14px #00ffff44;
}
body.theme-contrast .theme-btn        { background: #000000; border-color: #00ffff; color: #00ffff; }
body.theme-contrast .theme-btn:hover  { border-color: #ffffff; color: #ffffff; }
body.theme-contrast .theme-btn.active { border-color: #00ffff; color: #00ffff; }
body.theme-contrast .theme-panel      { background: #0a0a0a; border: 1.5px solid #ffff00; box-shadow: 0 8px 24px rgba(255,255,0,0.15); }
body.theme-contrast .theme-panel-title { color: #ffff00; }
body.theme-contrast .theme-opt        { border-color: #333333; color: #cccccc; }
body.theme-contrast .theme-opt:hover  { background: #001a00; border-color: #00ffff; color: #ffffff; }
body.theme-contrast .theme-opt.active { background: #001a1a; border-color: #00ffff; color: #00ffff; }
body.theme-contrast input[type="range"] {
    background: linear-gradient(
        to right,
        #00ffff90 0%,
        #00ffff90 var(--fill, 40%),
        #111111 var(--fill, 40%)
    );
}
body.theme-contrast input[type="range"]::-webkit-slider-thumb { background: #00ffff; border-color: #000000; box-shadow: 0 0 8px #00ffff88; }
body.theme-contrast input[type="range"]::-moz-range-thumb     { background: #00ffff; border-color: #000000; }
body.theme-contrast .qr-solid  { color: #88aaff; background: #00001a; border-color: #4466ff; }
body.theme-contrast .qr-liquid { color: #00ff88; background: #001a00; border-color: #00aa44; }
body.theme-contrast .qr-gas    { color: #ffaa00; background: #1a0e00; border-color: #aa6600; }


/* ════════════════════════════════════════════════════
   BOTONES SOBRE EL CANVAS (pausa, reinicio)
════════════════════════════════════════════════════ */
.canvas-toolbar {
    position: absolute;
    top: 14px;
    right: 18px;
    z-index: 10;
    display: flex;
    gap: 8px;
}

.canvas-btn {
    background: #1a2530;
    border: 1.5px solid #2a3d50;
    color: #7a91a1;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    font-family: system-ui, sans-serif;
    user-select: none;
    transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.canvas-btn:hover {
    background: #0e2230;
    border-color: #00c8ff44;
    color: #80a8c0;
}
.canvas-btn.active,
.canvas-btn[aria-pressed="true"] {
    background: #091a28;
    border-color: #00c8ff;
    color: #00c8ff;
    box-shadow: 0 0 14px #00c8ff28;
}

/* ════════════════════════════════════════════════════
   PANEL DE SIMULACIÓN (CANVAS)
════════════════════════════════════════════════════ */
.simulation-panel {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #111111;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

#canvas-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 14px;
}

#canvas-container canvas {
    box-shadow: 0 16px 48px rgba(0,0,0,0.65), 0 0 0 1px #252525;
    border-radius: 10px;
    /* El tamaño lo calcula fitCanvas() manteniendo la proporción 3:2 */
}

/* Hueco para los botones de pausa y reinicio (solo en el modo curva) */
body.mode-curva #canvas-container { padding-top: 58px; }

/* Foco visible para quien navega con teclado */
button:focus-visible,
select:focus-visible,
input:focus-visible,
summary:focus-visible {
    outline: 2px solid #00c8ff;
    outline-offset: 2px;
}
body.theme-light button:focus-visible,
body.theme-light select:focus-visible,
body.theme-light input:focus-visible,
body.theme-light summary:focus-visible { outline-color: #0077a0; }
body.theme-contrast button:focus-visible,
body.theme-contrast select:focus-visible,
body.theme-contrast input:focus-visible,
body.theme-contrast summary:focus-visible { outline-color: #ffff00; }

/* Texto solo para lectores de pantalla */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ════════════════════════════════════════════════════
   SECCIÓN EDUCATIVA (DETAILS)
════════════════════════════════════════════════════ */
.custom-details {
    background-color: #1c1c1c;
    border: 1px solid #2a2a2a;
    border-radius: 10px;
    overflow: hidden;
}

.custom-details summary {
    padding: 11px 14px;
    font-size: 0.75rem;
    font-weight: 700;
    color: #909090;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    cursor: pointer;
    list-style: none;
    position: relative;
    user-select: none;
}
.custom-details summary::-webkit-details-marker { display: none; }
.custom-details summary::after {
    content: '▶';
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.70rem;
    color: #444;
    transition: transform 0.2s ease, color 0.2s ease;
}
.custom-details[open] summary::after {
    transform: translateY(-50%) rotate(90deg);
    color: #00c8ff;
}

.details-content {
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 9px;
    background-color: #161616;
    border-top: 1px solid #232323;
}

.edu-card {
    padding: 11px 13px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Fórmulas */
.formula-list {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.formula {
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-family: monospace;
    font-size: 0.80rem;
    padding: 4px 0;
    border-bottom: 1px solid #252525;
}
.formula:last-child { border-bottom: none; }

.formula-name {
    color: #7a8b9b;
    min-width: 78px;
    font-size: 0.75rem;
}

.formula-eq {
    color: #a0d0e8;
    font-weight: 600;
}


/* ════════════════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
    .app-container { grid-template-columns: 1fr; height: auto; }
    body { overflow: auto; }
    .control-panel { height: auto; width: 100%; }
    /* En pantallas estrechas, el dibujo primero: es lo que hay que ver */
    .simulation-panel { height: auto; order: -1; }
    #canvas-container { height: auto; padding-bottom: 62px; }
}

@media (max-width: 500px) {
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
}