:root {
    color-scheme: light dark;
    --fondo: #f3f4f6;
    --panel: #ffffff;
    --texto: #16181d;
    --tenue: #5d6470;
    --borde: #d6d9df;
    --acento: #1f6feb;
    --acento-texto: #ffffff;
    --ok: #1a9c4b;
    --aviso: #c98a00;
    --mal: #d1362b;
    --video: #0b0c0e;
}
@media (prefers-color-scheme: dark) {
    :root {
        --fondo: #101216;
        --panel: #1a1d23;
        --texto: #e8eaee;
        --tenue: #9aa1ad;
        --borde: #2c313a;
        --acento: #4c8dff;
        --acento-texto: #0b0c0e;
    }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    background: var(--fondo);
    color: var(--texto);
    font: 15px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    display: flex;
    flex-direction: column;
    -webkit-text-size-adjust: 100%;
}
body.sin-scroll { overflow: hidden; }
[hidden] { display: none !important; }

button, input, select {
    font: inherit;
    color: inherit;
}
button {
    background: var(--panel);
    border: 1px solid var(--borde);
    border-radius: 8px;
    padding: 6px 12px;
    min-height: 36px;
    cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--acento); }
button:disabled { opacity: .45; cursor: default; }
button.primario, button.activo {
    background: var(--acento);
    border-color: var(--acento);
    color: var(--acento-texto);
}
:focus-visible { outline: 2px solid var(--acento); outline-offset: 2px; }

/* --- cabecera ----------------------------------------------------------- */
.cabecera {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 16px;
    padding: 8px max(12px, env(safe-area-inset-right)) 8px max(12px, env(safe-area-inset-left));
    padding-top: max(8px, env(safe-area-inset-top));
    background: var(--panel);
    border-bottom: 1px solid var(--borde);
}
.marca { font-size: 17px; }
.pestanas { display: flex; gap: 4px; }
.pestanas a {
    color: var(--tenue);
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 8px;
}
.pestanas a.activo { color: var(--texto); background: var(--fondo); font-weight: 600; }
.controles { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-left: auto; }
.grupo { display: flex; align-items: center; gap: 4px; }
.grupo button { min-width: 40px; padding: 6px 8px; }
.pagina { min-width: 56px; text-align: center; color: var(--tenue); font-variant-numeric: tabular-nums; }
.sesion { display: flex; align-items: center; gap: 8px; color: var(--tenue); }

.banner {
    margin: 0;
    padding: 8px 14px;
    background: var(--mal);
    color: #fff;
    font-weight: 600;
}
.nota { margin: 0; padding: 5px 14px; color: var(--tenue); font-size: 13px; border-bottom: 1px solid var(--borde); }
.aviso { color: var(--tenue); padding: 24px; grid-column: 1 / -1; text-align: center; }

/* --- mosaico ------------------------------------------------------------ */
.mosaico {
    flex: 1;
    min-height: 0;
    display: grid;
    gap: 4px;
    padding: 4px;
    padding-bottom: max(4px, env(safe-area-inset-bottom));
    grid-auto-rows: 1fr;
    touch-action: pan-y;
}
.mosaico-1 { grid-template-columns: 1fr; }
.mosaico-4 { grid-template-columns: repeat(2, 1fr); }
.mosaico-9 { grid-template-columns: repeat(3, 1fr); }
.mosaico-16 { grid-template-columns: repeat(4, 1fr); }

.celda {
    position: relative;
    background: var(--video);
    border-radius: 6px;
    overflow: hidden;
    min-height: 0;
    aspect-ratio: 16 / 9;
    cursor: zoom-in;
    user-select: none;
    -webkit-user-select: none;
}
@media (min-width: 701px) {
    /* En escritorio el mosaico ocupa la ventana sin desbordar */
    .celda { aspect-ratio: auto; }
    .mosaico-1 { grid-template-rows: 1fr; }
    .mosaico-4 { grid-template-rows: repeat(2, 1fr); }
    .mosaico-9 { grid-template-rows: repeat(3, 1fr); }
    .mosaico-16 { grid-template-rows: repeat(4, 1fr); }
}
@media (max-width: 700px) {
    .mosaico { flex: none; grid-auto-rows: auto; }
    .mosaico-9 { grid-template-columns: repeat(2, 1fr); }
    .mosaico-16 { grid-template-columns: repeat(2, 1fr); }
    .sesion #usuario { display: none; }
    .controles { margin-left: 0; order: 3; width: 100%; justify-content: space-between; }
    .sesion { margin-left: auto; }
}

cam-video { display: block; width: 100%; height: 100%; }
cam-video video { object-fit: contain; background: var(--video); }

.celda-barra {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 14px 8px 5px;
    color: #fff;
    font-size: 13px;
    background: linear-gradient(transparent, rgba(0, 0, 0, .75));
    pointer-events: none;
}
.celda-nombre { flex: 1; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-weight: 600; }
.celda-estado { color: #d5d8de; font-size: 12px; white-space: nowrap; }
.punto { width: 8px; height: 8px; border-radius: 50%; background: var(--aviso); flex: none; }
.celda[data-estado="directo"] .punto { background: var(--ok); }
.celda[data-estado="error"] .punto { background: var(--mal); }

/* --- cámara ampliada ---------------------------------------------------- */
.ampliado {
    position: fixed;
    inset: 0;
    z-index: 10;
    background: #000;
    color: #fff;
    display: flex;
    flex-direction: column;
}
.ampliado-barra {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    padding-top: max(8px, env(safe-area-inset-top));
    font-weight: 600;
}
.ampliado-barra .celda-estado { flex: 1; font-weight: 400; }
.ampliado-barra button { background: #1d2026; color: #fff; border-color: #3a3f49; }
.ampliado-video { flex: 1; min-height: 0; }

/* --- grabaciones -------------------------------------------------------- */
.tenue { color: var(--tenue); font-weight: 400; }
.pagina-grabaciones { display: block; }
.grabaciones {
    max-width: 1100px;
    margin: 0 auto;
    padding: 12px max(12px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
    display: grid;
    gap: 14px;
}
.filtros { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
.filtros label { display: grid; gap: 3px; font-size: 13px; color: var(--tenue); flex: 1 1 130px; }
.filtros select, .filtros input {
    width: 100%;
    min-height: 38px;
    padding: 6px 8px;
    font-size: 16px;
    color: var(--texto);
    background: var(--panel);
    border: 1px solid var(--borde);
    border-radius: 8px;
}
.filtros button { min-height: 38px; flex: 0 0 auto; }

.visor {
    position: relative;
    background: var(--video);
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    max-height: 62vh;
    width: 100%;
}
.pb-celda { position: relative; width: 100%; height: 100%; min-height: 0; background: var(--video); overflow: hidden; }
.pb-rotulo { position: absolute; left: 0; right: 0; bottom: 0; padding: 12px 8px 4px; font-size: 12px; font-weight: 600; color: #fff; background: linear-gradient(transparent, rgba(0, 0, 0, .75)); pointer-events: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.visor:not(.multi) .pb-rotulo { display: none; }
.visor.multi { display: grid; grid-template-columns: 1fr 1fr; grid-auto-rows: 1fr; gap: 3px; max-height: 70vh; }
.visor.multi .pb-celda { cursor: zoom-in; }
.visor.multi.zoom { grid-template-columns: 1fr; }
.visor.multi.zoom .pb-celda:not(.ampliada) { display: none; }
.visor.multi.zoom .pb-celda.ampliada { cursor: zoom-out; }
.visor-msg { position: absolute; inset: 0; margin: 0; display: grid; place-items: center; padding: 16px; text-align: center; color: #aab0bb; }
.transporte { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 8px; }
.reloj { font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums; min-width: 100px; text-align: center; }

.tl-barra { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin-bottom: 8px; }
.leyenda { display: flex; gap: 12px; margin-left: auto; font-size: 13px; color: var(--tenue); }
.leyenda i, .tramo i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; flex: none; }
.tipo-continuous { background: #3b82f6; }
.tipo-motion { background: #f59e0b; }
.tipo-alarm { background: #ef4444; }
.tl-linea {
    position: relative;
    height: 46px;
    background: var(--panel);
    border: 1px solid var(--borde);
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    touch-action: manipulation;
}
.tl-tramos { position: absolute; inset: 0; }
.tl-tramo { position: absolute; top: 8px; bottom: 8px; border-radius: 2px; }
.tl-tramo.tipo-motion { top: 4px; bottom: 4px; }
.tl-tramo.tipo-alarm { top: 0; bottom: 0; }
.tl-cursor { position: absolute; top: 0; bottom: 0; width: 2px; margin-left: -1px; background: var(--texto); pointer-events: none; }
.tl-marcas { position: relative; height: 18px; font-size: 11px; color: var(--tenue); }
.tl-marcas span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.tl-marcas span:first-child { transform: none; }
.tl-marcas span:last-child { transform: translateX(-100%); }

.titulo-seccion { font-size: 16px; margin: 4px 0 8px; }
.lista-tramos { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.tramo { display: flex; align-items: center; gap: 10px; width: 100%; padding: 6px; text-align: left; }
.tramo img { width: 96px; height: 54px; object-fit: cover; border-radius: 4px; background: var(--video); flex: none; }
.tramo img.sin-imagen { visibility: hidden; }
.tramo-txt { display: grid; }

/* --- exportación y administración ---------------------------------------- */
.pista { margin: 6px 0 0; font-size: 13px; }
.export { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; padding: 8px; background: var(--panel); border: 1px solid var(--borde); border-radius: 8px; }
.export .tramo-txt { flex: 1 1 220px; }
.export progress { flex: 1 1 120px; height: 10px; }
a.boton { display: inline-flex; align-items: center; min-height: 36px; padding: 6px 12px; border-radius: 8px; text-decoration: none; border: 1px solid var(--acento); background: var(--acento); color: var(--acento-texto); }
.tabla-scroll { overflow-x: auto; margin-bottom: 10px; }
.tabla { width: 100%; border-collapse: collapse; font-size: 14px; }
.tabla th, .tabla td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--borde); vertical-align: top; }
.tabla th { color: var(--tenue); font-weight: 600; white-space: nowrap; }
.tabla .acciones { white-space: nowrap; text-align: right; }
.tabla .acciones button { margin-left: 4px; }
.editor { background: var(--panel); border: 1px solid var(--borde); border-radius: 10px; padding: 12px; }
.filtros label.casilla, .canales label.casilla { display: flex; flex-direction: row; align-items: center; gap: 6px; color: var(--texto); font-size: 14px; flex: 0 0 auto; }
.casilla input { width: auto; min-height: 0; }
.canales { margin: 12px 0 0; border: 1px solid var(--borde); border-radius: 8px; display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 6px 12px; }

/* --- login -------------------------------------------------------------- */
.pagina-login { align-items: center; justify-content: center; padding: 16px; }
.tarjeta-login {
    width: 100%;
    max-width: 360px;
    background: var(--panel);
    border: 1px solid var(--borde);
    border-radius: 14px;
    padding: 28px 24px;
}
.tarjeta-login h1 { margin: 0; font-size: 24px; }
.tarjeta-login .sub { margin: 4px 0 20px; color: var(--tenue); }
.tarjeta-login label { display: block; margin: 14px 0 4px; font-weight: 600; }
.tarjeta-login input {
    width: 100%;
    padding: 10px 12px;
    font-size: 16px; /* evita el zoom automático de iOS */
    background: var(--fondo);
    border: 1px solid var(--borde);
    border-radius: 8px;
}
.tarjeta-login button { width: 100%; margin-top: 20px; min-height: 44px; font-weight: 600; }
.error { color: var(--mal); font-weight: 600; margin: 14px 0 0; }