:root {
  color-scheme: light;
  --navy: #102f43;
  --teal: #17566c;
  --gold: #d9b66f;
  --ink: #173447;
  --muted: #536d7d;
  --line: #dce5eb;
  --paper: #f5f8fa;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
[hidden] { display: none !important; }
a { color: var(--teal); text-underline-offset: .25em; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid #a26a0c; outline-offset: 5px; }
.container { width: min(100% - 3rem, 1100px); margin-inline: auto; }
.site-header { color: #fff; background: var(--navy); border-bottom: 3px solid var(--gold); }
.header-inner { min-height: 132px; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding-block: 1.3rem; }
.brand { display: flex; align-items: center; gap: 1rem; color: #fff; font-size: 1.4rem; font-weight: 650; line-height: 1.6; text-decoration: none; }
.brand-caption { display: block; font-size: .75rem; font-weight: 400; color: #dbbd83; margin-bottom: .25rem; }
.brand-symbol { display: grid; place-items: center; width: 56px; height: 60px; flex: 0 0 56px; border: 1px solid #5b7280; border-radius: 14px; color: #e5c78f; background: #ffffff08; }
.brand-symbol svg { width: 32px; height: 32px; }
.site-header p { margin: 0; color: #dfe8ee; font-size: .95rem; }
main.container { min-height: 68vh; padding-bottom: 3.5rem; }
nav ol { display: flex; flex-wrap: wrap; align-items: center; gap: .1rem .6rem; list-style: none; padding: .85rem 0; margin: 0; font-size: .85rem; border-bottom: 1px solid var(--line); }
nav li { display: inline-flex; align-items: center; gap: .6rem; min-width: 0; }
nav li:not(:last-child)::after { content: "‹"; color: #78919f; }
nav a { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--ink); text-decoration: underline; }
nav [aria-current] { color: var(--ink); }
.page-heading { padding: 2rem 0 1.6rem; }
h1 { font-size: clamp(1.55rem, 3vw, 2rem); font-weight: 700; line-height: 1.65; margin: 0 0 .45rem; }
h2 { font-size: 1.1rem; line-height: 1.8; margin: 0; }
.intro { color: var(--muted); margin: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: 1.25rem; }
.card { position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: 1rem; min-height: 230px; padding: 1.5rem; border: 1px solid var(--line); border-radius: 18px; background: #fff; color: var(--ink); text-decoration: none; overflow-wrap: anywhere; box-shadow: 0 4px 16px #18384c05; transition: border-color .18s, box-shadow .18s, transform .18s; }
.card-body { display: flex; flex-direction: column; gap: .5rem; min-width: 0; }
.card strong { font-size: 1.25rem; font-weight: 650; line-height: 1.7; }
.card-detail { color: var(--muted); font-size: .9rem; }
.card-label { font-size: .85rem; color: var(--gold); }
.card-marker { display: grid; place-items: center; width: 48px; height: 48px; flex: 0 0 48px; color: var(--teal); border-radius: 13px; background: #edf4f7; font-size: 1.15rem; font-variant-numeric: tabular-nums; }
.card-action { display: block; margin-top: auto; padding-top: .6rem; font-size: .9rem; font-weight: 600; color: var(--teal); }
.subject-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.subject-card { min-height: 310px; max-width: 540px; padding: 1.8rem 2rem; background: linear-gradient(120deg, #164b60, #102f43 85%); border: 1px solid #244e64; color: white; overflow: hidden; }
.subject-card::before { content: ""; position: absolute; inset-block: 0; inset-inline-end: 0; width: 7px; background: var(--gold); }
.subject-card .card-marker { width: 44px; height: 44px; flex-basis: 44px; background: #ffffff0c; border: 1px solid #ffffff25; color: #ebcd92; font-size: 1.6rem; }
.subject-card strong { font-size: clamp(1.45rem, 3vw, 1.8rem); max-width: 390px; }
.subject-card .card-detail { color: #dde8ee; }
.subject-card .card-action { border-top: 1px solid #ffffff25; width: 100%; padding-top: 1rem; color: #ebcd92; }
.subject-card .card-body { gap: .5rem; }
[data-theme="turquoise"] { --unit-bg: #e1f2ef; --unit-accent: #4baba5; --unit-ink: #195c59; }
[data-theme="blue"] { --unit-bg: #e8eef9; --unit-accent: #809ecb; --unit-ink: #304f7b; }
[data-theme="purple"] { --unit-bg: #f1e8f2; --unit-accent: #b89cbd; --unit-ink: #67466e; }
[data-theme="orange"] { --unit-bg: #fff0e4; --unit-accent: #eda567; --unit-ink: #8a4c20; }
[data-theme="green"] { --unit-bg: #e6f1e8; --unit-accent: #6cac87; --unit-ink: #315f44; }
.unit-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.unit-card { border-top: 5px solid var(--unit-accent); background: var(--unit-bg); box-shadow: none; min-height: 285px; }
.unit-card strong { color: var(--unit-ink); }
.unit-card .card-marker, .unit-lessons .card-marker { background: var(--unit-bg); color: var(--unit-ink); border: 1px solid var(--unit-accent); }
.unit-card .card-marker { background: #ffffff80; }
.unit-card .card-action { color: var(--unit-ink); }
.unit-card .card-detail { color: var(--unit-ink); }
.unit-lessons .review-card { margin-top: .7rem; background: var(--unit-bg); border: 1px solid var(--unit-accent); border-inline-start-width: 5px; }
.review-card strong, .review-card .card-detail { color: var(--unit-ink); }
@media (max-width: 600px) { .unit-grid { grid-template-columns: 1fr; } .unit-card { min-height: 245px; } }
.lesson-list { display: grid; gap: .8rem; }
.lesson-card { flex-direction: row; align-items: center; min-height: 112px; gap: 1.2rem; padding: 1.2rem 1.4rem; }
.lesson-card::after { content: "←"; margin-inline-start: auto; color: var(--teal); font-size: 1.2rem; }
.lesson-card strong { font-size: 1.12rem; }
.lesson-card .card-detail { font-size: .85rem; }
.activity-card .card-marker { background: #f8f1e3; color: #865d19; font-size: 1.5rem; }
.activity-card .card-action { width: 100%; border-top: 1px solid var(--line); padding-top: .8rem; }
.notice { color: var(--muted); background: #fff; border: 1px dashed #b6c9d5; padding: 1.4rem; border-radius: 14px; }
.thumbnail { width: 100%; height: 170px; object-fit: cover; border-radius: 10px; }
footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1rem; color: var(--muted); border-top: 1px solid var(--line); padding-block: 1.2rem; font-size: .8rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .5rem 1rem; border: 1px solid var(--teal); border-radius: 10px; background: var(--teal); color: #fff; text-decoration: none; font: inherit; }
.button.secondary { background: #fff; color: var(--teal); }
.page-back { margin-top: 1.2rem; gap: .65rem; font-size: .9rem; font-weight: 600; }
.page-back + .page-heading { padding-top: 1.2rem; }
.skip-link { position: absolute; top: -100px; background: #fff; padding: .7rem; z-index: 10; }
.skip-link:focus { top: 0; }
.player-page { display: flex; flex-direction: column; height: 100vh; height: 100dvh; background: #fff; }
.player-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: .7rem 1.2rem; padding: .85rem 1.2rem; border-bottom: 2px solid var(--gold); background: var(--navy); color: #fff; }
.player-toolbar .button { background: #e9c889; border-color: #e9c889; color: var(--navy); font-weight: 600; font-size: .9rem; }
.player-toolbar .secondary { background: transparent; color: #fff; border-color: #77919f; font-weight: 400; }
.player-heading { flex: 1; min-width: min(100%, 220px); }
.player-heading h1 { margin: 0; font-size: 1.05rem; }
.player-heading p { margin: 0; font-size: .85rem; color: #d1e0e8; }
.player-main { position: relative; flex: 1; min-height: 300px; display: flex; flex-direction: column; }
.player-main .notice { margin: 1rem; }
iframe { flex: 1; width: 100%; border: 0; min-height: 300px; background: #fff; }
@media (hover: hover) {
  .card:hover { border-color: #7a9aaa; box-shadow: 0 10px 24px #18384c0c; transform: translateY(-2px); }
  .subject-card:hover { border-color: var(--gold); }
  .button:hover { filter: brightness(1.08); }
}
@media (max-width: 600px) {
  :root { font-size: 16px; }
  .container { width: calc(100% - 2rem); }
  .header-inner { min-height: 145px; flex-wrap: wrap; gap: .7rem; padding-block: 1.1rem; }
  .brand { font-size: 1.15rem; gap: .75rem; }
  .brand-symbol { width: 45px; height: 48px; flex-basis: 45px; }
  .brand-symbol svg { width: 27px; height: 27px; }
  .site-header p { padding-inline-start: calc(45px + .75rem); }
  .page-heading { padding-block: 1.5rem 1.25rem; }
  .subject-card { min-height: 290px; padding: 1.5rem; }
  .lesson-card { gap: .8rem; padding: 1rem; }
  .lesson-card .card-marker { width: 38px; height: 42px; flex-basis: 38px; }
  .lesson-card strong { font-size: 1.05rem; }
  .player-heading { order: -1; flex-basis: 100%; }
  .player-toolbar .button { flex: 1; font-size: .85rem; }
}
@media (prefers-reduced-motion: reduce) {
  .card { transition: none; }
  .card:hover { transform: none; }
}

/* بطاقة المادة المعتمدة مع غلاف الكتاب */

    .book-card { display: flex; flex-direction: column; width: 100%; max-width: 620px; padding: 0; gap: 0; min-height: 0; border-radius: 20px; background: linear-gradient(115deg, #17495b, #102f43 72%); box-shadow: 0 12px 32px #17344712; }
    .book-card::before { inset-inline: 0; inset-block: 0 auto; width: auto; height: 3px; background: linear-gradient(90deg, #d9b66f55, #e7cb93); }
    .book-card-main { display: flex; align-items: center; justify-content: space-between; gap: 28px; width: 100%; padding: 30px; }
    .book-card .card-body { flex: 1; gap: 14px; }
    .book-card .card-label { color: #dec38e; font-size: .8rem; letter-spacing: .02em; }
    .book-card strong { font-size: clamp(1.5rem, 2.8vw, 2rem); line-height: 1.5; font-weight: 700; }
    .book-card strong span { display: block; font-size: .74em; font-weight: 500; margin-top: 8px; color: #f0f5f7; }
    .grade-tag { align-self: flex-start; display: inline-block; color: #e5edf0; border: 1px solid #ffffff26; border-radius: 7px; padding: 3px 12px; margin-top: 4px; font-size: .85rem; background: #ffffff06; }
    .book-cover { display: block; width: 174px; flex: 0 0 174px; aspect-ratio: 773 / 1000; border-radius: 3px 7px 7px 3px; box-shadow: -7px 10px 20px #051d2a60, 0 0 0 1px #e6cda455; overflow: hidden; background: #fbf8ed; }
    .book-cover img { display: block; width: 100%; height: 100%; object-fit: contain; }
    .book-card .card-action { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 0; padding: 17px 30px; background: #071e2c22; border-color: #ffffff15; color: #e7cb93; font-size: .9rem; }
    .card-action .arrow { display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid #d9b66f44; border-radius: 50%; font-size: 1rem; }
    @media (max-width: 600px) {
      .book-card-main { padding: 24px 22px; gap: 20px; }
      .book-cover { width: 122px; flex-basis: 122px; }
      .book-card .card-body { gap: 10px; }
      .book-card strong { font-size: 1.5rem; }
      .book-card strong span { font-size: .78em; }
      .book-card .card-label { font-size: .75rem; }
      .book-card .card-action { padding: 15px 22px; }
    }
    @media (max-width: 380px) {
      .book-cover { width: 100px; flex-basis: 100px; }
      .book-card-main { gap: 16px; padding: 22px 18px; }
      .book-card strong { font-size: 1.35rem; }
    }