:root {
    --indigo: #007f91;
    --indigo-2: #009fb5;
    --ink: #18343a;
    --muted: #60777c;
    --orange: #e28a21;
    --paper: #fff;
    --surface: #f4f8f8;
    --line: #dbe7e8;
    --green: #15803d;
    --red: #b91c1c;
    --amber: #b45309;
    --radius: 18px;
    --shadow: 0 24px 70px rgba(0, 127, 145, .13)
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth
}

body {
    margin: 0;
    background: var(--surface);
    color: var(--ink);
    font-family: "Open Sans", Arial, ui-sans-serif, system-ui, sans-serif;
    line-height: 1.5
}

a {
    color: inherit;
    text-decoration: none
}

button,
input,
select,
textarea {
    font: inherit
}

button {
    cursor: pointer
}

img {
    max-width: 100%
}

.wrap {
    width: min(1180px, calc(100% - 40px));
    margin: auto
}

.brand {
    display: flex;
    gap: .45rem;
    align-items: baseline;
    font-size: 1.12rem;
    font-weight: 650
}

.brand strong {
    color: var(--indigo)
}

.brand span {
    color: var(--orange);
    font-weight: 900
}

.brand-light,
.brand-light strong {
    color: #fff
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    min-width: 0
}

.brand-logo img {
    display: block;
    width: auto;
    height: 62px;
    object-fit: contain
}

.brand-logo span {
    padding-left: .7rem;
    border-left: 1px solid var(--line);
    color: #416168;
    font-size: .73rem;
    font-weight: 800;
    letter-spacing: .04em;
    text-transform: uppercase;
    white-space: nowrap
}

.brand-logo-light span {
    border-left-color: rgba(255, 255, 255, .3);
    color: #d8f6fa
}

.sidebar-brand {
    display: grid;
    justify-items: start;
    gap: 0;
    padding: 0 7px
}

.sidebar-brand img {
    height: 72px;
    max-width: 190px
}

.sidebar-brand span {
    border: 0;
    padding: 0 0 0 12px;
    margin-top: -10px;
    color: #b9e8ee
}

.student-brand img {
    height: 58px
}

.setup-logo {
    width: 150px;
    margin: -12px auto 0
}

.eyebrow {
    display: inline-block;
    color: var(--indigo-2);
    font-size: .72rem;
    font-weight: 850;
    letter-spacing: .1em;
    text-transform: uppercase
}

.eyebrow.light {
    color: #a9edf5
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    border: 0;
    border-radius: 11px;
    padding: .72rem 1rem;
    font-weight: 800;
    transition: .2s
}

.btn:hover {
    transform: translateY(-1px)
}

.btn-primary {
    background: linear-gradient(135deg, #00b7cd, var(--indigo));
    color: #fff;
    box-shadow: 0 10px 24px rgba(0, 159, 181, .24)
}

.btn-secondary {
    background: #e8f7f9;
    color: var(--indigo)
}

.btn-ghost {
    background: #fff;
    border: 1px solid var(--line);
    color: var(--indigo)
}

.btn-danger {
    background: #fee2e2;
    color: var(--red)
}

.btn-warning {
    background: #fff7ed;
    color: #9a3412
}

.btn-small {
    padding: .48rem .68rem;
    border-radius: 8px;
    font-size: .78rem
}

.btn-large {
    padding: .92rem 1.24rem
}

.public-page {
    background: #fff
}

.public-header {
    height: 92px;
    display: flex;
    align-items: center;
    gap: 28px
}

.public-header nav {
    display: flex;
    gap: 24px;
    margin-left: auto;
    color: #475f64;
    font-size: .9rem
}

.landing-hero {
    min-height: 650px;
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    align-items: center;
    gap: 70px;
    padding-block: 70px
}

.hero-copy h1,
.section-heading h2,
.process-layout h2,
.contact-panel h2 {
    margin: .7rem 0 1.2rem;
    letter-spacing: -.055em;
    line-height: 1.08
}

.hero-copy h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    color: #123d45
}

.hero-copy>p {
    max-width: 660px;
    color: #536d72;
    font-size: 1.12rem
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin: 28px 0
}

.trust-line {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    color: #60777c;
    font-size: .78rem;
    font-weight: 750
}

.trust-line span:before {
    content: "✓";
    color: var(--indigo-2);
    margin-right: 6px
}

.hero-visual {
    position: relative;
    background: #fff;
    border: 1px solid #dbe7e8;
    border-radius: 24px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transform: rotate(1.2deg)
}

.visual-toolbar {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--line);
    color: #60777c
}

.visual-toolbar img {
    height: 36px;
    width: auto;
    margin-left: 8px
}

.visual-toolbar i {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: #cbd5e1
}

.visual-toolbar i:first-child {
    background: #fb7185
}

.visual-toolbar i:nth-child(2) {
    background: #fbbf24
}

.visual-toolbar i:nth-child(3) {
    background: #4ade80
}

.visual-toolbar strong {
    margin-left: 2px;
    font-size: .8rem
}

.visual-body {
    display: grid;
    grid-template-columns: 58px 1fr;
    min-height: 390px
}

.visual-body aside {
    background: #123d45;
    padding: 25px 16px;
    display: grid;
    align-content: start;
    gap: 16px
}

.visual-body aside b {
    height: 8px;
    border-radius: 9px;
    background: #00b7cd
}

.visual-shelf {
    padding: 28px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    background: #f4f8f8
}

.mini-book {
    min-height: 170px;
    border-radius: 8px 16px 16px 8px;
    padding: 18px;
    background: linear-gradient(145deg, #007f91, #00b7cd);
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: -5px 0 #a7e7ee
}

.mini-book span {
    font-size: .68rem;
    color: #d8f8fb
}

.mini-book strong {
    font-size: 1.12rem;
    line-height: 1.1
}

.mini-book.orange {
    background: linear-gradient(145deg, #bf6816, #eeac5d);
    box-shadow: -5px 0 #f7d8b0
}

.mini-book.pale {
    background: linear-gradient(145deg, #1e7a70, #56cbbb);
    box-shadow: -5px 0 #b9eee7
}

.security-pill {
    position: absolute;
    right: 22px;
    bottom: 18px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 12px 32px rgba(18, 61, 69, .16);
    border-radius: 999px;
    padding: 10px 14px;
    font-size: .72rem;
    font-weight: 800;
    color: var(--indigo)
}

.brand-proof {
    background: #f0fafb;
    border-block: 1px solid #d5f0f3
}

.proof-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    padding-block: 28px
}

.proof-grid div {
    display: grid;
    justify-items: center;
    gap: 2px;
    border-right: 1px solid #c7e8ec
}

.proof-grid div:last-child {
    border: 0
}

.proof-grid strong {
    color: #007f91;
    font-size: 2rem;
    letter-spacing: -.04em
}

.proof-grid span {
    color: #60777c;
    font-size: .78rem;
    font-weight: 750
}

.section {
    padding-block: 100px
}

.section-heading {
    max-width: 760px
}

.section-heading h2,
.process-layout h2,
.contact-panel h2 {
    font-size: clamp(1.9rem, 3.8vw, 3.6rem);
    color: #123d45
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
    margin-top: 50px
}

.feature-grid article {
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fff
}

.feature-number {
    color: var(--orange);
    font-weight: 900;
    font-size: .72rem
}

.feature-grid h3 {
    font-size: 1.35rem;
    margin: 2.4rem 0 .55rem
}

.feature-grid p {
    margin: 0;
    color: var(--muted)
}

.section-dark {
    background: #123d45;
    color: #fff
}

.process-layout {
    display: grid;
    grid-template-columns: .85fr 1.15fr;
    gap: 80px
}

.process-layout h2 {
    color: #fff
}

.process-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid
}

.process-list li {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 16px;
    padding: 22px 0;
    border-bottom: 1px solid rgba(255, 255, 255, .13)
}

.process-list li>span {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: #009fb5;
    font-weight: 900
}

.process-list strong {
    font-size: 1.12rem
}

.process-list p {
    margin: .2rem 0 0;
    color: #cbe7ea
}

.contact-panel {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: end;
    gap: 50px
}

.contact-panel p {
    color: var(--muted)
}

.contact-actions {
    display: grid;
    gap: 10px;
    text-align: center
}

.contact-actions>a:not(.btn) {
    color: var(--indigo);
    font-weight: 750
}

.public-footer {
    padding: 24px 0;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: .84rem
}

.public-footer .wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px
}

.public-footer .wrap div {
    display: flex;
    gap: 20px
}

.footer-logo img {
    display: block;
    height: 46px;
    width: auto
}

.auth-page {
    min-height: 100vh;
    background: #edf8f9
}

.auth-layout {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1.05fr .95fr
}

.auth-story {
    padding: 50px 65px;
    background: radial-gradient(circle at 20% 20%, #00b7cd, #123d45 68%);
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: space-between
}

.auth-story h1 {
    font-size: clamp(3.2rem, 6vw, 6rem);
    line-height: .94;
    letter-spacing: -.06em;
    margin: .7rem 0 1.2rem
}

.auth-story p {
    color: #cbeff3;
    font-size: 1.1rem;
    max-width: 560px
}

.back-link {
    color: #b9e8ee
}

.auth-panel {
    display: grid;
    place-items: center;
    padding: 34px
}

.auth-card {
    width: min(100%, 470px);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
    padding: 34px;
    display: grid;
    gap: 14px
}

.auth-card h2 {
    font-size: 2.15rem;
    letter-spacing: -.04em;
    margin: .3rem 0 0
}

.auth-card>p {
    color: var(--muted);
    margin: 0 0 .6rem
}

.auth-card label,
.field {
    display: grid;
    gap: 6px;
    font-size: .78rem;
    font-weight: 800;
    color: #334f54
}

.auth-card input,
.form-control,
.field input,
.field select,
.field textarea {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid #c5d8da;
    border-radius: 9px;
    background: #fff;
    color: var(--ink)
}

textarea {
    min-height: 100px;
    resize: vertical
}

.login-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 4px;
    background: #edf5f6;
    border-radius: 11px
}

.login-switch a {
    text-align: center;
    padding: 9px;
    border-radius: 8px;
    color: var(--muted);
    font-size: .8rem;
    font-weight: 800
}

.login-switch a.active {
    background: #fff;
    color: var(--indigo);
    box-shadow: 0 2px 8px rgba(18, 61, 69, .08)
}

.subtle-link {
    text-align: center;
    color: var(--indigo);
    font-size: .82rem;
    font-weight: 700
}

.simple-auth .auth-panel {
    min-height: 100vh
}

.notice {
    display: grid;
    gap: 7px;
    padding: 14px;
    background: #e8f7f9;
    border-radius: 10px
}

.notice.warning {
    background: #fff7ed
}

.notice code {
    overflow-wrap: anywhere
}

.flash {
    padding: 12px 14px;
    border-radius: 10px;
    font-size: .84rem
}

.flash-success {
    background: #dcfce7;
    color: #166534
}

.flash-error {
    background: #fee2e2;
    color: #991b1b
}

.legal {
    max-width: 850px;
    padding-block: 70px
}

.legal h1 {
    font-size: 3.5rem;
    letter-spacing: -.05em
}

.legal h2 {
    margin-top: 2rem
}

.legal p {
    color: #475f64;
    font-size: 1.02rem
}

.legal a {
    color: var(--indigo);
    text-decoration: underline
}

.admin-page {
    display: grid;
    grid-template-columns: 255px 1fr;
    min-height: 100vh
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 24px 18px;
    background: #123d45;
    color: #fff;
    display: flex;
    flex-direction: column;
    z-index: 20
}

.sidebar .brand {
    padding: 7px 8px
}

.sidebar nav {
    display: grid;
    gap: 4px;
    margin-top: 30px
}

.sidebar nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 9px;
    color: #cbd5e1;
    font-size: .86rem;
    font-weight: 650
}

.sidebar nav a:hover,
.sidebar nav a.active {
    background: rgba(255, 255, 255, .1);
    color: #fff
}

.sidebar-footer {
    margin-top: auto;
    display: grid;
    gap: 10px;
    padding: 8px
}

.sidebar-footer small {
    color: #94a3b8
}

.sidebar-logout {
    color: #fed7aa;
    font-size: .82rem;
    font-weight: 750
}

.sidebar-toggle {
    display: none
}

.admin-main {
    min-width: 0;
    padding: 27px 32px
}

.admin-topbar {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 20px;
    margin-bottom: 24px
}

.admin-topbar h1 {
    font-size: 2.55rem;
    letter-spacing: -.05em;
    margin: .25rem 0
}

.admin-user {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 9px 13px;
    font-size: .78rem;
    font-weight: 800
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-bottom: 22px
}

.stat-card {
    padding: 20px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 15px
}

.stat-card span,
.stat-card strong {
    display: block
}

.stat-card span {
    font-size: .76rem;
    color: var(--muted);
    font-weight: 750
}

.stat-card strong {
    font-size: 2.35rem;
    color: var(--indigo);
    letter-spacing: -.05em;
    margin-top: 6px
}

.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 10px 34px rgba(0, 127, 145, .05);
    margin-bottom: 20px
}

.card-header,
.section-title {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 18px
}

.card-header h2,
.section-title h2 {
    margin: .22rem 0 0;
    font-size: 1.35rem
}

.card-header p {
    margin: .35rem 0 0;
    color: var(--muted);
    font-size: .86rem
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px
}

.form-grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr))
}

.form-grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr))
}

.form-grid .span-2 {
    grid-column: span 2
}

.form-grid .span-all,
.form-actions {
    grid-column: 1/-1
}

.field.switch-field {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-top: 23px
}

.field.switch-field input {
    width: auto
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 4px
}

.table-wrap {
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: 13px
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff
}

th,
td {
    padding: 11px 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: middle
}

thead th {
    background: #f8fafc;
    color: #64748b;
    font-size: .69rem;
    text-transform: uppercase;
    letter-spacing: .05em;
    white-space: nowrap
}

tbody tr:last-child td,
tbody tr:last-child th {
    border-bottom: 0
}

tbody tr:hover {
    background: #fafbff
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px
}

.status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: 999px;
    padding: 5px 8px;
    font-size: .68rem;
    font-weight: 850;
    white-space: nowrap
}

.status:before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor
}

.status-published,
.status-active {
    background: #dcfce7;
    color: #166534
}

.status-draft {
    background: #e2e8f0;
    color: #475569
}

.status-processing {
    background: #fef3c7;
    color: #92400e
}

.status-error,
.status-inactive {
    background: #fee2e2;
    color: #991b1b
}

.status-unpublished {
    background: #ffedd5;
    color: #9a3412
}

.badge {
    display: inline-flex;
    border-radius: 999px;
    padding: 4px 8px;
    background: #e8f7f9;
    color: var(--indigo);
    font-size: .68rem;
    font-weight: 800
}

.badge-orange {
    background: #fff7ed;
    color: #9a3412
}

.empty-state {
    text-align: center;
    padding: 48px;
    color: var(--muted)
}

.empty-state h3 {
    color: var(--ink)
}

.filter-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap
}

.filter-row input,
.filter-row select {
    padding: 9px 10px;
    border: 1px solid var(--line);
    border-radius: 9px
}

.split-layout {
    display: grid;
    grid-template-columns: 1.25fr .75fr;
    gap: 20px
}

.check-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 8px
}

.check-option {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 9px;
    border: 1px solid var(--line);
    border-radius: 9px;
    font-size: .78rem
}

.check-option input {
    width: auto
}

.metadata {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px
}

.metadata div {
    background: #f8fafc;
    padding: 12px;
    border-radius: 10px
}

.metadata span,
.metadata strong {
    display: block
}

.metadata span {
    font-size: .69rem;
    color: var(--muted);
    text-transform: uppercase
}

.metadata strong {
    margin-top: 4px
}

.cover-thumb {
    width: 46px;
    aspect-ratio: 3/4;
    object-fit: cover;
    border-radius: 6px;
    background: linear-gradient(145deg, var(--indigo), var(--indigo-2))
}

.audit-json {
    font-size: .72rem;
    color: var(--muted);
    max-width: 320px;
    overflow-wrap: anywhere
}

.student-page {
    min-height: 100vh
}

.student-topbar {
    height: 72px;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 0 max(22px, calc((100% - 1320px)/2));
    background: #fff;
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 10
}

.student-user {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: .82rem
}

.student-user a {
    color: var(--indigo);
    font-weight: 800
}

.student-main {
    width: min(1320px, calc(100% - 40px));
    margin: auto;
    padding: 38px 0 70px
}

.shelf-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 26px
}

.shelf-heading h1,
.reader-heading h1 {
    font-size: 3rem;
    letter-spacing: -.055em;
    margin: .3rem 0
}

.shelf-heading p {
    color: var(--muted);
    margin: 0
}

.library-section {
    margin-top: 35px
}

.library-section h2 {
    font-size: 1.25rem
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 22px
}

.material-card {
    position: relative;
    display: flex;
    flex-direction: column
}

.material-cover {
    aspect-ratio: 3/4;
    border-radius: 10px 19px 19px 10px;
    background: linear-gradient(145deg, #007f91, #00b7cd);
    box-shadow: -6px 0 #a7e7ee, 0 20px 35px rgba(0, 127, 145, .18);
    overflow: hidden;
    color: #fff;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between
}

.material-cover.has-image {
    padding: 0
}

.material-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover
}

.material-cover .type {
    font-size: .7rem;
    font-weight: 900;
    color: #fed7aa;
    text-transform: uppercase
}

.material-cover strong {
    font-size: 1.35rem;
    line-height: 1.08
}

.material-meta {
    padding: 14px 3px 3px
}

.material-meta h3 {
    margin: 0;
    font-size: 1rem
}

.material-meta p {
    margin: .35rem 0;
    color: var(--muted);
    font-size: .78rem;
    min-height: 2.35rem
}

.source-list {
    display: flex;
    flex-wrap: wrap;
    gap: 5px
}

.favorite-form {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2
}

.favorite-button {
    width: 36px;
    height: 36px;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, .9);
    color: #94a3b8;
    font-size: 1.15rem;
    box-shadow: 0 5px 16px rgba(15, 23, 42, .16)
}

.favorite-button.is-favorite {
    color: #f59e0b
}

.reader-heading {
    display: flex;
    justify-content: space-between;
    align-items: end
}

.viewer {
    display: grid;
    grid-template-columns: 58px minmax(0, 1fr) 58px;
    gap: 14px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px;
    box-shadow: var(--shadow);
    min-height: 65vh
}

.page-stage {
    position: relative;
    display: grid;
    place-items: center;
    min-height: 60vh
}

.page-stage img {
    max-height: 75vh;
    box-shadow: 0 22px 50px rgba(15, 23, 42, .23);
    user-select: none
}

.page-arrow {
    height: 76px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    color: var(--indigo);
    font-size: 2.4rem
}

.loading-pill {
    position: absolute;
    z-index: 2;
    display: flex;
    gap: 9px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    padding: 11px 14px;
    border-radius: 999px;
    box-shadow: var(--shadow)
}

.loading-pill[hidden] {
    display: none !important
}

.spinner {
    width: 15px;
    height: 15px;
    border: 2px solid #a7e7ee;
    border-top-color: var(--indigo-2);
    border-radius: 50%;
    animation: spin .8s linear infinite
}

@keyframes spin {
    to {
        transform: rotate(360deg)
    }
}

.reader-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    align-items: center;
    margin-top: 16px
}

.page-counter {
    background: #fff;
    border: 1px solid var(--line);
    padding: 8px 12px;
    border-radius: 10px
}

.page-counter input {
    width: 65px;
    padding: 6px;
    border: 1px solid var(--line);
    border-radius: 7px;
    text-align: center
}

.material-view {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 24px
}

.video-frame {
    width: 100%;
    aspect-ratio: 16/9;
    border: 0;
    border-radius: 14px;
    background: #0f172a
}

.external-callout {
    padding: 34px;
    text-align: center;
    background: #e8f7f9;
    border-radius: 14px
}

.external-callout p {
    color: var(--muted)
}

@media(max-width:980px) {

    .landing-hero,
    .process-layout,
    .contact-panel,
    .auth-layout,
    .split-layout {
        grid-template-columns: 1fr
    }

    .landing-hero {
        padding-top: 35px
    }

    .hero-visual {
        max-width: 650px
    }

    .auth-story {
        min-height: 360px
    }

    .admin-page {
        grid-template-columns: 1fr
    }

    .sidebar {
        position: fixed;
        left: -280px;
        width: 255px;
        transition: .25s
    }

    .sidebar-open .sidebar {
        left: 0
    }

    .sidebar-toggle {
        display: inline-flex
    }

    .admin-main {
        padding: 20px
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr)
    }

    .form-grid-4,
    .form-grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr))
    }

    .public-header nav {
        display: none
    }
}

@media(max-width:650px) {
    .wrap {
        width: min(100% - 28px, 1180px)
    }

    .public-header {
        height: 70px
    }

    .landing-hero {
        min-height: 0;
        gap: 38px
    }

    .hero-copy h1 {
        font-size: 3.15rem
    }

    .hero-actions {
        flex-direction: column
    }

    .visual-shelf {
        grid-template-columns: 1fr
    }

    .feature-grid {
        grid-template-columns: 1fr
    }

    .section {
        padding-block: 70px
    }

    .contact-actions {
        width: 100%
    }

    .auth-story {
        padding: 32px 24px
    }

    .auth-panel {
        padding: 16px
    }

    .auth-card {
        padding: 24px
    }

    .admin-main {
        padding: 14px
    }

    .admin-topbar h1 {
        font-size: 2rem
    }

    .stats-grid,
    .form-grid,
    .form-grid-3,
    .form-grid-4,
    .metadata {
        grid-template-columns: 1fr
    }

    .form-grid .span-2 {
        grid-column: auto
    }

    .card {
        padding: 16px
    }

    .shelf-heading,
    .reader-heading {
        align-items: flex-start;
        flex-direction: column
    }

    .student-main {
        width: min(100% - 24px, 1320px);
        padding-top: 25px
    }

    .student-user span {
        display: none
    }

    .viewer {
        grid-template-columns: 1fr;
        padding: 10px;
        min-height: 0
    }

    .page-arrow {
        display: none
    }

    .page-stage {
        min-height: 45vh
    }

    .reader-controls {
        flex-wrap: wrap
    }

    .public-footer .wrap {
        flex-direction: column;
        gap: 12px
    }
}

/* Identidad visual DAE Formación */
.sidebar {
    background: #123d45
}

.sidebar nav a {
    color: #c7e1e4
}

.sidebar-footer small {
    color: #9bc9ce
}

.sidebar-logout {
    color: #f3bd7c
}

.card {
    box-shadow: 0 10px 34px rgba(0, 127, 145, .055)
}

.badge {
    background: #e8f7f9
}

.material-cover {
    background: linear-gradient(145deg, #007f91, #00b7cd);
    box-shadow: -6px 0 #a7e7ee, 0 20px 35px rgba(0, 127, 145, .18)
}

.material-cover .type {
    color: #d8f8fb
}

.spinner {
    border-color: #a7e7ee;
    border-top-color: #009fb5
}

.external-callout {
    background: #e8f7f9
}

.student-topbar {
    border-top: 3px solid #009fb5
}

.admin-topbar h1,
.shelf-heading h1,
.reader-heading h1 {
    color: #123d45
}

.stat-card strong {
    color: #007f91
}

@media(max-width:650px) {
    .brand-logo img {
        height: 54px
    }

    .brand-logo span {
        display: none
    }

    .student-brand img {
        height: 50px
    }

    .proof-grid {
        grid-template-columns: 1fr
    }

    .proof-grid div {
        padding: 14px 0;
        border-right: 0;
        border-bottom: 1px solid #c7e8ec
    }

    .proof-grid div:last-child {
        border-bottom: 0
    }

    .public-footer .wrap {
        align-items: flex-start
    }

    .footer-logo img {
        height: 42px
    }
}



/* Progreso de lectura y marcadores */
.reading-progress {
    height: 8px;
    overflow: hidden;
    border-radius: 999px;
    background: #dfeaec
}

.reading-progress>span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--indigo-2), var(--indigo));
    transition: width .25s ease
}

.book-progress {
    display: grid;
    gap: 6px;
    margin: .65rem 0 .75rem
}

.book-progress-line,
.book-progress-note,
.reader-progress-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px
}

.book-progress-line {
    font-size: .73rem;
    color: var(--ink)
}

.book-progress-line strong {
    color: var(--indigo)
}

.book-progress-note {
    font-size: .68rem;
    color: var(--muted);
    flex-wrap: wrap
}

.reader-progress-card {
    display: grid;
    gap: 8px;
    margin-bottom: 16px;
    padding: 14px 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px
}

.reader-progress-card small {
    color: var(--muted)
}

.reader-tools {
    margin-top: 18px;
    padding: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px
}

.marker-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px
}

.marker-actions h2 {
    margin: .2rem 0 0;
    font-size: 1.1rem
}

.markers-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px
}

.marker-chip {
    display: inline-flex;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: 999px;
    overflow: hidden;
    background: #f8fbfb
}

.marker-jump,
.marker-delete {
    border: 0;
    background: transparent
}

.marker-jump {
    padding: 7px 11px;
    color: var(--indigo);
    font-size: .78rem;
    font-weight: 800
}

.marker-delete {
    padding: 5px 10px;
    border-left: 1px solid var(--line);
    color: var(--red);
    font-size: 1rem
}

.markers-empty {
    margin: 0;
    color: var(--muted);
    font-size: .82rem
}

.admin-progress-cell {
    display: grid;
    grid-template-columns: minmax(90px, 160px) auto;
    align-items: center;
    gap: 8px
}

.admin-progress-cell small {
    color: var(--muted);
    font-weight: 800
}

@media(max-width:650px) {
    .marker-actions {
        align-items: flex-start;
        flex-direction: column
    }

    .marker-actions .btn {
        width: 100%
    }

    .reader-progress-head {
        align-items: flex-start;
        flex-direction: column;
        gap: 2px
    }
}
/* Biblioteca jerárquica / V7 */
.category-breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin:0 0 18px;color:var(--muted);font-size:.8rem}.category-breadcrumbs a{color:var(--indigo);font-weight:800}.category-breadcrumbs .sep{color:#94a3b8}.folder-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin:0 0 32px}.category-folder{display:grid;grid-template-columns:58px 1fr;align-items:center;gap:14px;min-height:92px;padding:16px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:0 10px 28px rgba(0,127,145,.06);transition:.2s}.category-folder:hover{transform:translateY(-2px);border-color:#a7e7ee;box-shadow:0 16px 35px rgba(0,127,145,.11)}.folder-icon{position:relative;width:54px;height:42px;border-radius:6px 9px 9px 9px;background:linear-gradient(145deg,#00b7cd,#007f91);box-shadow:inset 0 -7px 0 rgba(0,0,0,.06)}.folder-icon:before{content:"";position:absolute;left:4px;top:-8px;width:25px;height:11px;border-radius:6px 6px 0 0;background:#00a8bd}.category-folder strong{display:block;font-size:1rem}.category-folder small{display:block;margin-top:4px;color:var(--muted)}.shelf-tools{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:0 0 22px}.page-size-control{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.8rem;font-weight:750}.page-size-control select{padding:8px 30px 8px 10px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink)}.pagination{display:flex;justify-content:center;align-items:center;gap:7px;flex-wrap:wrap;margin:34px 0 0}.pagination a,.pagination span{min-width:38px;height:38px;padding:0 10px;border:1px solid var(--line);border-radius:9px;background:#fff;display:grid;place-items:center;font-size:.8rem;font-weight:800;color:var(--indigo)}.pagination span.current{background:var(--indigo);border-color:var(--indigo);color:#fff}.pagination span.disabled{color:#a1aeb1;background:#f5f8f8}.category-tree-name{display:flex;align-items:center;gap:8px}.category-depth{display:inline-block;width:calc(var(--depth,0) * 18px)}.root-badge{background:#123d45;color:#fff}.catalog-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.catalog-grid .span-all{grid-column:1/-1}.api-code{white-space:pre-wrap;overflow:auto;padding:16px;border-radius:12px;background:#102f35;color:#d9f5f8;font:13px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.api-endpoint{display:grid;grid-template-columns:160px 1fr;gap:12px;padding:11px 0;border-bottom:1px solid var(--line)}.api-endpoint:last-child{border-bottom:0}.api-method{font-weight:900;color:var(--indigo)}
@media(max-width:760px){.catalog-grid{grid-template-columns:1fr}.api-endpoint{grid-template-columns:1fr}.folder-grid{grid-template-columns:1fr}}

/* V12 · búsqueda contextual de biblioteca + previsualización admin */
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.student-search{flex:1 1 460px;max-width:680px;min-width:240px;display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:0;margin-left:18px;border:1px solid var(--line);border-radius:13px;background:#f8fbfb;overflow:hidden;transition:.2s}
.student-search:focus-within{border-color:#8ddce5;box-shadow:0 0 0 3px rgba(0,159,181,.10);background:#fff}
.student-search-icon{padding-left:13px;color:var(--indigo);font-size:1.2rem;font-weight:900;line-height:1}
.student-search input[type=search]{min-width:0;width:100%;border:0;outline:0;background:transparent;padding:10px 11px;color:var(--ink)}
.student-search input[type=search]::placeholder{color:#82979b}
.student-search button{align-self:stretch;border:0;border-left:1px solid var(--line);background:#e8f7f9;color:var(--indigo);padding:0 15px;font-size:.78rem;font-weight:900}
.student-search button:hover{background:#d7f1f4}
.student-search-clear{display:grid;place-items:center;align-self:stretch;min-width:38px;border-left:1px solid var(--line);color:#7b9094;font-size:1.25rem;font-weight:700;background:#fff}
.student-search-clear:hover{color:var(--red);background:#fff5f5}
.material-search-path{margin:.35rem 0 0;color:var(--indigo);font-size:.69rem;font-weight:800;line-height:1.35}
.admin-material-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.admin-material-actions form{margin:0}.admin-reader-heading{margin-bottom:18px}.admin-book-preview{min-height:62vh}.admin-preview-note{margin:12px 0 0;text-align:center;color:var(--muted);font-size:.78rem}
@media(max-width:1050px){.student-topbar{height:auto;min-height:72px;flex-wrap:wrap;padding-top:8px;padding-bottom:8px}.student-search{order:3;flex-basis:100%;max-width:none;margin:0}.student-user{margin-left:auto}}
@media(max-width:650px){.student-search{grid-template-columns:auto minmax(0,1fr) auto}.student-search button{display:none}.student-search-clear{min-width:36px}.admin-material-actions{justify-content:flex-start}.admin-reader-heading .admin-material-actions{width:100%}.admin-reader-heading .admin-material-actions .btn{flex:1 1 auto}}

/* V13.1 · zoom en viewport, rueda para zoom y pan con botón central */
.reader-frame{display:grid;gap:12px}
.reader-view-tools{display:flex;align-items:center;justify-content:flex-end;gap:10px;flex-wrap:wrap}
.reader-interaction-hint{margin-right:auto;color:var(--muted);font-size:.73rem;font-weight:700;white-space:nowrap}
.reader-zoom-controls{display:inline-flex;align-items:stretch;border:1px solid var(--line);border-radius:11px;overflow:hidden;background:#fff}
.reader-zoom-controls .btn{border:0;border-radius:0;box-shadow:none;transform:none}
.reader-zoom-controls .btn+.btn{border-left:1px solid var(--line)}
.reader-icon-button{min-width:44px;font-size:1.15rem;line-height:1}
.reader-zoom-value{min-width:72px;color:var(--ink)}
.reader-view-tools button:disabled{opacity:.42;cursor:not-allowed}

/* La hoja vive dentro de una ventana fija. Al ampliar, sólo crece el contenido interior. */
.page-stage{position:relative;height:72vh;min-height:420px;max-height:none;overflow:auto;padding:0;background:#dfe8ea;border:1px solid #d0dde0;border-radius:14px;overscroll-behavior:contain;scrollbar-gutter:stable both-edges;scroll-behavior:auto;touch-action:pan-x pan-y}
.page-canvas{box-sizing:border-box;display:flex;align-items:center;justify-content:center;min-width:100%;min-height:100%;width:max-content;height:max-content;padding:18px}
.page-stage img{display:block;flex:0 0 auto;width:auto;height:auto;max-width:none;max-height:none;margin:0;box-shadow:0 22px 50px rgba(15,23,42,.23);user-select:none;-webkit-user-drag:none}
.page-stage.is-zoomed .page-canvas{align-items:flex-start}
.page-stage.is-panning,.page-stage.is-panning *{cursor:grabbing!important;user-select:none!important}
body.reader-middle-pan-active{user-select:none}
.page-stage>.loading-pill{position:sticky;top:50%;left:50%;z-index:8;width:max-content;transform:translate(-50%,-50%);margin:0 0 -46px 0}

.reader-frame:fullscreen{width:100vw;height:100vh;padding:12px;background:#e8f0f1;display:flex;flex-direction:column;gap:10px;overflow:hidden}
.reader-frame:fullscreen .reader-view-tools{flex:0 0 auto;padding:0 2px}
.reader-frame:fullscreen .viewer{flex:1 1 auto;height:auto;min-height:0;margin:0;padding:12px;box-shadow:none}
.reader-frame:fullscreen .page-stage{height:100%;min-height:0;max-height:none}
.reader-frame:fullscreen .reader-controls{flex:0 0 auto;margin:0;padding-bottom:2px}
.reader-frame:fullscreen .page-arrow{height:64px}
.reader-frame:fullscreen .reader-view-tools,.reader-frame:fullscreen .reader-controls{position:relative;z-index:3}
.admin-reader-frame{margin-top:2px}

@media(max-width:800px){.reader-interaction-hint{display:none}}
@media(max-width:650px){
    .reader-view-tools{justify-content:space-between}
    .reader-view-tools>#fullscreenButton{flex:1 1 auto}
    .page-stage{height:60vh;min-height:300px}
    .page-canvas{padding:10px}
    .reader-frame:fullscreen{padding:7px}
    .reader-frame:fullscreen .viewer{padding:7px}
    .reader-frame:fullscreen .page-stage{height:100%;min-height:0}
}