/* ============================================================
   VARIABLES GLOBALES
   ============================================================ */
:root {
    --color-bg: #f5f9fc;
    --color-surface: #ffffff;
    --color-primary: #0066cc;
    --color-primary-light: #e6f0ff;
    --color-text: #1e2a41;
    --color-text-secondary: #3b4d6b;
    --color-border: #e2e9f2;
    --color-shadow: rgba(0, 20, 40, 0.04);
    --color-success: #2ecc71;
    --color-danger: #e0563f;
    --radius-card: 24px;
    --radius-pill: 60px;
    --font-family: 'Inter', -apple-system, sans-serif;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    padding: 24px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    line-height: 1.5;
}

.app {
    max-width: 1440px;
    width: 100%;
}

/* 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;
}

/* Foco visible accesible en toda la app */
a:focus-visible,
button:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 6px;
}

/* ===== HEADER ===== */
.header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: var(--color-surface);
    padding: 16px 28px;
    border-radius: var(--radius-card);
    box-shadow: 0 8px 20px var(--color-shadow);
    margin-bottom: 28px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    background: var(--color-primary);
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.4rem;
}

.brand-name {
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: -0.3px;
}
.brand-name span {
    color: var(--color-primary);
}

.header-controls {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
}

.patient-selector {
    display: flex;
    align-items: center;
    background: #f0f4f9;
    border-radius: var(--radius-pill);
    padding: 4px 8px 4px 18px;
    border: 1px solid var(--color-border);
}
.patient-selector select {
    border: none;
    background: transparent;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 10px 6px 10px 0;
    outline: none;
    font-family: inherit;
    color: var(--color-text);
    cursor: pointer;
}
.patient-selector i {
    color: var(--color-primary);
}

.lang-toggle {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    padding: 8px 16px;
    font-weight: 500;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    color: var(--color-text-secondary);
}
.lang-toggle:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
}

/* ===== GRID DE MÓDULOS ===== */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.module-card {
    background: var(--color-surface);
    border-radius: var(--radius-card);
    padding: 22px 20px 18px;
    border: 1px solid var(--color-border);
    box-shadow: 0 6px 18px var(--color-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: stretch;
}
.module-card:hover {
    box-shadow: 0 8px 24px rgba(0, 20, 40, 0.08);
}
.module-card.is-offline {
    opacity: 0.62;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.card-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-title i {
    color: var(--color-primary);
    font-size: 1.1rem;
}

.module-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 40px;
    font-size: 0.7rem;
    font-weight: 600;
}
.module-status.online {
    background: #e7f8ee;
    color: #1c7a43;
}
.module-status.offline {
    background: #fbeae6;
    color: #a8341f;
}
.module-status .status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor;
}
.module-status.online .status-dot {
    animation: pulse-green 1.6s infinite;
}

.value-display {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 6px;
}
.value-main {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: #0b1a31;
    font-variant-numeric: tabular-nums;
}
.value-unit {
    font-size: 1rem;
    font-weight: 500;
    color: #5e7290;
}

.value-meta {
    font-size: 0.75rem;
    color: #7690ac;
    margin-bottom: 16px;
}

/* Botón Acceder */
.btn-acceder {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 9px 0;
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    margin-top: 8px;
    font-family: inherit;
    letter-spacing: 0.3px;
}
.btn-acceder:hover:not(:disabled) {
    background: #004d99;
}
.btn-acceder:active:not(:disabled) {
    transform: scale(0.98);
}
.btn-acceder:disabled {
    background: #c7d3e0;
    cursor: not-allowed;
}

/* ===== GRÁFICO ===== */
.row-secondary {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 28px;
}

.chart-card, .history-card {
    background: var(--color-surface);
    border-radius: var(--radius-card);
    padding: 22px 20px 20px;
    border: 1px solid var(--color-border);
    box-shadow: 0 6px 18px var(--color-shadow);
}

.chart-header, .history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    height: 120px;
    margin: 12px 0 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid #eef3f8;
}
.bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}
.bar {
    width: 100%;
    max-width: 36px;
    border-radius: 20px 20px 4px 4px;
    transition: height 0.4s ease;
    min-height: 8px;
}

.chart-legend {
    display: flex;
    gap: 18px;
    font-size: 0.7rem;
    color: #47658a;
    margin-top: 4px;
    flex-wrap: wrap;
}
.legend-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 4px;
    margin-right: 4px;
}

/* ===== HISTORIAL ===== */
.history-list {
    max-height: 200px;
    overflow-y: auto;
    margin-top: 8px;
}
.history-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #f0f5fa;
    font-size: 0.9rem;
}
.history-item:last-child {
    border-bottom: none;
}
.history-module {
    font-weight: 500;
    color: #1e3b5c;
    display: flex;
    align-items: center;
}
.history-value {
    color: #47658a;
    font-weight: 500;
}
.history-time {
    color: #6e89a8;
    font-size: 0.8rem;
    padding-right: 8px;
}
.history-empty {
    color: #8ba0bc;
    font-size: 0.85rem;
    padding: 12px 0;
    text-align: center;
}

/* ===== FOOTER ===== */
.footer {
    margin-top: 24px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    background: var(--color-surface);
    padding: 12px 24px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: #3f5a79;
    gap: 12px;
}
.footer-status {
    flex: 1;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}
.footer .disclaimer {
    background: #fef6e6;
    padding: 4px 16px;
    border-radius: var(--radius-pill);
    color: #935e00;
    font-weight: 500;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    gap: 6px;
}
.footer .disclaimer i {
    color: #b85e00;
}

/* LED verde */
.led {
    display: inline-flex;
    align-items: center;
    margin-left: 4px;
}
.led i {
    font-size: 0.7rem;
    color: var(--color-success);
    animation: pulse-green 1.5s infinite;
}
.led.led-red i {
    color: var(--color-danger);
    animation: none;
}
@keyframes pulse-green {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

/* ===== MODAL DE MÓDULO ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 22, 40, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    z-index: 100;
}
.modal-overlay[hidden] {
    display: none;
}
.modal-box {
    background: var(--color-surface);
    border-radius: var(--radius-card);
    padding: 28px;
    max-width: 420px;
    width: 100%;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 20, 40, 0.25);
}
.modal-box h2 {
    font-size: 1.2rem;
    margin-bottom: 14px;
    padding-right: 24px;
}
.modal-close {
    position: absolute;
    top: 18px;
    right: 18px;
    background: #f0f4f9;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: var(--transition);
}
.modal-close:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}
.modal-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #f0f5fa;
    font-size: 0.9rem;
}
.modal-row:last-child {
    border-bottom: none;
}
.modal-row span:first-child {
    color: #6e89a8;
}
.modal-row span:last-child {
    font-weight: 600;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 800px) {
    .row-secondary {
        grid-template-columns: 1fr;
    }
    .header {
        flex-direction: column;
        align-items: stretch;
    }
    .header-controls {
        justify-content: space-between;
    }
    .modules-grid {
        grid-template-columns: 1fr;
    }
    .footer {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* Respetar preferencia de reducción de movimiento */
@media (prefers-reduced-motion: reduce) {
    .led i,
    .module-status.online .status-dot,
    .bar {
        animation: none !important;
        transition: none !important;
    }
}

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: #eef3f9; border-radius: 10px; }
::-webkit-scrollbar-thumb { background: #b6ccdf; border-radius: 10px; }