/* Lector PDF común para biblioteca, tareas y documentos del aula. */
body.pdf-reader-open {
    overflow: hidden;
}

.pdf-reader-modal {
    position: fixed;
    inset: 0;
    z-index: 100020;
    display: grid;
    place-items: center;
    padding: 12px;
    background: rgba(13, 21, 39, .78);
    backdrop-filter: blur(6px);
}

.pdf-reader-modal[hidden] {
    display: none;
}

.pdf-reader-dialog {
    display: flex;
    flex-direction: column;
    width: min(1180px, 100%);
    height: min(94vh, 900px);
    min-height: 0;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.55);
    border-radius: 23px;
    background: #f7f9fc;
    box-shadow: 0 30px 90px rgba(0,0,0,.35);
    color: #17233d;
    font-family: "DM Sans", system-ui, sans-serif;
}

.pdf-reader-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    padding: 14px 18px;
    border-bottom: 1px solid #e1e7f0;
    background: linear-gradient(135deg, #fff, #eef3ff);
}

.pdf-reader-heading {
    display: flex;
    align-items: center;
    gap: 11px;
    min-width: 0;
}

.pdf-reader-icon {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    flex: 0 0 40px;
    border-radius: 13px;
    color: #fff;
    background: linear-gradient(135deg, #c51f3e, #7046d5);
    box-shadow: 0 8px 18px rgba(112,70,213,.22);
}

.pdf-reader-heading small,
.pdf-reader-heading strong {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pdf-reader-heading small {
    margin-bottom: 3px;
    color: #71809a;
    font-size: .67rem;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.pdf-reader-heading strong {
    color: #17233d;
    font: 800 1rem/1.25 "Manrope", sans-serif;
}

.pdf-reader-close {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    flex: 0 0 36px;
    border: 0;
    border-radius: 11px;
    color: #58677e;
    background: #e9eef7;
    cursor: pointer;
}

.pdf-reader-close:hover,
.pdf-reader-close:focus-visible {
    color: #fff;
    background: #c51f3e;
    outline: none;
}

.pdf-reader-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    padding: 10px 15px;
    border-bottom: 1px solid #e1e7f0;
    background: #fff;
}

.pdf-reader-tool-group {
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
}

.pdf-reader-tool,
.pdf-reader-page-control {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 34px;
    border: 1px solid #dce4ef;
    border-radius: 9px;
    color: #52627b;
    background: #f8faff;
    font: 800 .72rem "DM Sans", sans-serif;
}

.pdf-reader-tool {
    gap: 5px;
    padding: 7px 9px;
    cursor: pointer;
}

.pdf-reader-tool:hover,
.pdf-reader-tool:focus-visible,
.pdf-reader-tool.is-active {
    color: #fff;
    border-color: #7651c9;
    background: #7651c9;
    outline: none;
}

.pdf-reader-tool[disabled] {
    cursor: default;
    opacity: .42;
}

.pdf-reader-page-control {
    gap: 6px;
    padding: 4px 7px;
    background: #fff;
}

.pdf-reader-page-control input {
    width: 35px;
    padding: 4px 2px;
    border: 1px solid #dce4ef;
    border-radius: 6px;
    color: #17233d;
    background: #f8faff;
    font: 800 .75rem "DM Sans", sans-serif;
    text-align: center;
}

.pdf-reader-page-control input:focus {
    border-color: #7651c9;
    outline: 2px solid rgba(118,81,201,.16);
}

.pdf-reader-status {
    min-height: 0;
    padding: 7px 17px;
    color: #66758c;
    background: #f7f9fc;
    font-size: .69rem;
    line-height: 1.35;
}

.pdf-reader-status:empty {
    display: none;
}

.pdf-reader-stage {
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    padding: 22px;
    background:
        radial-gradient(circle at 15% 10%, #33476c 0, transparent 22rem),
        #172237;
}

.pdf-reader-page {
    position: relative;
    flex: 0 0 auto;
    background: #fff;
    box-shadow: 0 14px 35px rgba(0,0,0,.3);
}

.pdf-reader-page[hidden],
.pdf-reader-fallback[hidden],
.pdf-reader-loading[hidden],
.pdf-reader-error[hidden] {
    display: none;
}

.pdf-reader-page canvas {
    display: block;
    max-width: none;
    background: #fff;
}

.pdf-reader-mark-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.pdf-reader-mark-layer.is-drawing {
    cursor: crosshair;
    pointer-events: auto;
}

.pdf-reader-mark {
    position: absolute;
    border-radius: 3px;
    background: rgba(255, 216, 65, .42);
    box-shadow: inset 0 -2px rgba(228, 165, 0, .28);
}

.pdf-reader-fallback {
    width: min(100%, 1000px);
    height: 100%;
    min-height: 420px;
    overflow: hidden;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 14px 35px rgba(0,0,0,.3);
}

.pdf-reader-fallback iframe {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 420px;
    border: 0;
    background: #fff;
}

.pdf-reader-loading,
.pdf-reader-error {
    display: grid;
    place-items: center;
    align-content: center;
    gap: 9px;
    min-height: 260px;
    padding: 28px;
    color: #dbe7ff;
    text-align: center;
}

.pdf-reader-loading i,
.pdf-reader-error > i {
    color: #9bb4ff;
    font-size: 2rem;
}

.pdf-reader-error h3 {
    margin: 0;
    color: #fff;
    font: 800 1.05rem "Manrope", sans-serif;
}

.pdf-reader-error p {
    max-width: 430px;
    margin: 0;
    color: #b8c6df;
    font-size: .8rem;
}

.pdf-reader-error a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 12px;
    border-radius: 10px;
    color: #fff;
    background: #3157d5;
    font-size: .75rem;
    font-weight: 900;
    text-decoration: none;
}

.pdf-reader-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    padding: 10px 15px;
    border-top: 1px solid #e1e7f0;
    background: #fff;
}

.pdf-reader-footer-actions {
    display: flex;
    align-items: center;
    gap: 7px;
    flex-wrap: wrap;
}

.pdf-reader-footer a,
.pdf-reader-help {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 10px;
    border-radius: 9px;
    color: #53627b;
    background: #f0f3f8;
    font-size: .7rem;
    font-weight: 900;
    text-decoration: none;
}

.pdf-reader-footer a:hover {
    color: #3157d5;
    background: #eaf0ff;
    text-decoration: none;
}

.pdf-reader-help {
    color: #7b879a;
    background: transparent;
    font-weight: 700;
}

@media (max-width: 640px) {
    .pdf-reader-modal {
        padding: 0;
    }

    .pdf-reader-dialog {
        width: 100%;
        height: 100%;
        border: 0;
        border-radius: 0;
    }

    .pdf-reader-header {
        padding: 12px;
    }

    .pdf-reader-toolbar {
        justify-content: flex-start;
        padding: 8px 10px;
    }

    .pdf-reader-tool {
        min-width: 34px;
        padding: 7px;
    }

    .pdf-reader-tool span {
        display: none;
    }

    .pdf-reader-stage {
        padding: 12px 8px;
    }

    .pdf-reader-footer {
        padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
    }

    .pdf-reader-help {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .pdf-reader-modal * {
        scroll-behavior: auto !important;
    }
}