/* ينفع — design system (RTL, mobile first). Public site + shared base for admin. */

@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 400; font-display: swap; src: url(../fonts/tajawal-arabic-400-normal.woff2) format("woff2");
  unicode-range: U+0600-06FF, U+0750-077F, U+0870-088E, U+0890-0891, U+0897-08E1, U+08E3-08FF, U+200C-200E, U+2010-2011, U+204F, U+2E41, U+FB50-FDFF, U+FE70-FE74, U+FE76-FEFC; }
@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 500; font-display: swap; src: url(../fonts/tajawal-arabic-500-normal.woff2) format("woff2");
  unicode-range: U+0600-06FF, U+0750-077F, U+0870-088E, U+0890-0891, U+0897-08E1, U+08E3-08FF, U+200C-200E, U+2010-2011, U+204F, U+2E41, U+FB50-FDFF, U+FE70-FE74, U+FE76-FEFC; }
@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 700; font-display: swap; src: url(../fonts/tajawal-arabic-700-normal.woff2) format("woff2");
  unicode-range: U+0600-06FF, U+0750-077F, U+0870-088E, U+0890-0891, U+0897-08E1, U+08E3-08FF, U+200C-200E, U+2010-2011, U+204F, U+2E41, U+FB50-FDFF, U+FE70-FE74, U+FE76-FEFC; }
@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 800; font-display: swap; src: url(../fonts/tajawal-arabic-800-normal.woff2) format("woff2");
  unicode-range: U+0600-06FF, U+0750-077F, U+0870-088E, U+0890-0891, U+0897-08E1, U+08E3-08FF, U+200C-200E, U+2010-2011, U+204F, U+2E41, U+FB50-FDFF, U+FE70-FE74, U+FE76-FEFC; }
@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 400; font-display: swap; src: url(../fonts/tajawal-latin-400-normal.woff2) format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212; }
@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 500; font-display: swap; src: url(../fonts/tajawal-latin-500-normal.woff2) format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212; }
@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 700; font-display: swap; src: url(../fonts/tajawal-latin-700-normal.woff2) format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212; }
@font-face { font-family: "Tajawal"; font-style: normal; font-weight: 800; font-display: swap; src: url(../fonts/tajawal-latin-800-normal.woff2) format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212; }

:root {
  /* colour */
  --brand: #0f766e;            /* teal-700, 5.4:1 on white */
  --brand-ink: #ffffff;
  --brand-soft: #e6f4f2;
  --accent: #b45309;
  --ink: #1f2937;
  --ink-2: #374151;
  --muted: #4b5563;            /* 7:1 on white */
  --line: #e2e6ea;
  --line-strong: #cbd2d9;
  --bg: #f5f7f8;
  --surface: #ffffff;
  --ok: #15803d;  --ok-soft: #e8f6ec;
  --warn: #92400e; --warn-soft: #fff4e0;
  --bad: #b91c1c;  --bad-soft: #fdecec;
  --focus: #f59e0b;
  /* type scale */
  --font: "Tajawal", "Segoe UI", Tahoma, "Noto Sans Arabic", Arial, sans-serif;
  --fs-xs: .8125rem; --fs-sm: .875rem; --fs-base: 1rem; --fs-md: 1.125rem; --fs-lg: 1.25rem; --fs-xl: 1.5rem; --fs-2xl: 1.875rem; --fs-3xl: 2.25rem;
  --lh: 1.65;
  /* spacing */
  --s-1: .25rem; --s-2: .5rem; --s-3: .75rem; --s-4: 1rem; --s-5: 1.25rem; --s-6: 1.5rem; --s-7: 2rem; --s-8: 3rem;
  /* shape */
  --r-sm: .5rem; --r-md: .875rem; --r-lg: 1.25rem; --r-pill: 999px;
  --shadow-1: 0 1px 2px rgba(16, 24, 40, .06);
  --shadow-2: 0 4px 14px rgba(16, 24, 40, .08);
  /* layout */
  --tap: 2.75rem;              /* 44px minimum touch target */
  --tap-lg: 3.25rem;
  --appbar-h: 3.5rem;
  --tabbar-h: 4rem;
  --maxw: 72rem;
}
.theme-primary { --brand: #c2410c; --brand-soft: #fff1e8; }
.theme-intermediate { --brand: #0f766e; --brand-soft: #e6f4f2; }
.theme-secondary { --brand: #1d4ed8; --brand-soft: #eaf0fe; }

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); font-size: var(--fs-base); line-height: var(--lh); color: var(--ink); background: var(--bg);
  letter-spacing: 0; overflow-wrap: anywhere; -webkit-tap-highlight-color: transparent; }
h1, h2, h3 { line-height: 1.35; margin: 0; font-weight: 800; }
p { margin: 0 0 var(--s-3); }
a { color: var(--brand); text-underline-offset: .2em; }
img { max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: 0; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: var(--r-sm); }
.icon { width: 1.25em; height: 1.25em; flex: none; vertical-align: -.25em; }
.sr { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; inset-inline-start: var(--s-3); inset-block-start: -10rem; z-index: 50; background: var(--surface); padding: var(--s-2) var(--s-4); border-radius: var(--r-sm); box-shadow: var(--shadow-2); }
.skip:focus { inset-block-start: var(--s-3); }
.muted { color: var(--muted); }
.small { font-size: var(--fs-sm); }
[hidden] { display: none !important; }
.wrap { width: min(var(--maxw), 100% - 2rem); margin-inline: auto; }

/* ---------- app bar (mobile) / top bar (desktop) ---------- */
.appbar { position: sticky; inset-block-start: 0; z-index: 20; background: var(--surface); border-block-end: 1px solid var(--line); }
.appbar-row { display: flex; align-items: center; gap: var(--s-2); min-height: var(--appbar-h); }
.appbar-title { flex: 1; min-width: 0; font-size: var(--fs-md); font-weight: 800; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin: 0; }
.icon-btn { display: inline-grid; place-items: center; width: var(--tap); height: var(--tap); flex: none; border: 0; border-radius: var(--r-pill);
  background: transparent; color: var(--ink); text-decoration: none; cursor: pointer; }
.icon-btn:hover { background: var(--bg); }
.icon-btn .icon { width: 1.5rem; height: 1.5rem; }
.logo { display: inline-flex; align-items: center; gap: var(--s-2); color: var(--ink); text-decoration: none; font-weight: 800; font-size: var(--fs-lg); min-height: var(--tap); }
.logo-mark { width: 2.25rem; height: 2.25rem; border-radius: .7rem; display: grid; place-items: center; background: var(--brand); color: #fff; font-size: 1.25rem; line-height: 1; padding-block-start: .15em; }
.topnav, .top-search, .logo-desktop { display: none; }

/* bottom tab bar */
.tabbar { position: fixed; inset-inline: 0; inset-block-end: 0; z-index: 30; background: var(--surface); border-block-start: 1px solid var(--line);
  padding-block-end: env(safe-area-inset-bottom, 0); box-shadow: 0 -2px 10px rgba(16, 24, 40, .05); }
.tabbar ul { list-style: none; margin: 0 auto; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); max-width: 40rem; }
.tabbar li { min-width: 0; }
.tabbar a { display: grid; justify-items: center; align-content: center; gap: .125rem; min-height: var(--tabbar-h); padding: var(--s-1) 0;
  color: var(--muted); text-decoration: none; font-size: var(--fs-xs); font-weight: 700; text-align: center; overflow: hidden; overflow-wrap: normal; }
.tabbar .icon { width: 1.625rem; height: 1.625rem; }
.tabbar a[aria-current="page"] { color: var(--brand); }
.tabbar a[aria-current="page"] .tab-icon { background: var(--brand-soft); }
.tab-icon { display: grid; place-items: center; width: 3.5rem; max-width: 100%; height: 1.875rem; border-radius: var(--r-pill); transition: background-color .15s; }
body.has-tabbar { padding-block-end: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px)); }

@media (min-width: 64em) {
  .tabbar { display: none; }
  body.has-tabbar { padding-block-end: 0; }
  .appbar-row { min-height: 4.25rem; gap: var(--s-5); }
  .appbar .back-btn, .appbar-title { display: none; }
  .appbar .logo, .appbar .logo-desktop { display: inline-flex; margin-inline-end: auto; }
  .topnav { display: flex; gap: var(--s-1); order: 2; }
  .topnav a { display: inline-flex; align-items: center; gap: var(--s-2); min-height: var(--tap); padding-inline: var(--s-3); border-radius: var(--r-md);
    color: var(--ink-2); text-decoration: none; font-weight: 700; }
  .topnav a:hover { background: var(--bg); }
  .topnav a[aria-current="page"] { background: var(--brand-soft); color: var(--brand); }
  .top-search { display: flex; order: 3; width: 16rem; }
}

/* breadcrumbs */
.crumbs { margin-block: var(--s-3) 0; font-size: var(--fs-sm); color: var(--muted); }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; gap: var(--s-1); align-items: center; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.crumbs ol::-webkit-scrollbar { display: none; }
.crumbs li { display: inline-flex; align-items: center; gap: var(--s-1); }
.crumbs li + li::before { content: "‹"; color: var(--line-strong); }
.crumbs a { color: var(--muted); text-decoration: none; display: inline-block; padding-block: var(--s-2); }
.crumbs a:hover { color: var(--brand); text-decoration: underline; }
.crumbs [aria-current] { color: var(--ink); font-weight: 700; max-width: 16rem; overflow: hidden; text-overflow: ellipsis; }

main { display: block; padding-block-end: var(--s-7); min-height: 60vh; }

/* ---------- buttons & form controls ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2); min-height: var(--tap); padding: var(--s-2) var(--s-5);
  border-radius: var(--r-md); border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); font-weight: 700; font-size: var(--fs-base);
  text-decoration: none; cursor: pointer; line-height: 1.3; text-align: center; transition: background-color .15s, border-color .15s; }
.btn:hover { border-color: var(--brand); color: var(--brand); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { color: var(--brand-ink); filter: brightness(1.08); }
.btn-big { min-height: var(--tap-lg); font-size: var(--fs-md); padding-inline: var(--s-6); border-radius: var(--r-lg); }
.btn-block { display: flex; width: 100%; }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn-danger:hover { color: #fff; filter: brightness(1.08); }
.btn[aria-pressed="true"] { background: var(--brand-soft); border-color: var(--brand); color: var(--brand); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .55; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-block: var(--s-3); }
.is-busy { position: relative; pointer-events: none; opacity: .75; }
.is-busy::after { content: ""; width: 1em; height: 1em; border: 2px solid currentColor; border-inline-end-color: transparent; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.input, .search-field input, select.input { width: 100%; min-height: var(--tap); border: 1px solid var(--line-strong); border-radius: var(--r-md);
  padding: var(--s-2) var(--s-4); background: var(--surface); font-size: var(--fs-base); }
.input:focus, .search-field input:focus { outline: 3px solid color-mix(in srgb, var(--brand) 30%, transparent); border-color: var(--brand); }
.search-field { position: relative; display: flex; align-items: center; width: 100%; }
.search-field > .icon { position: absolute; inset-inline-start: var(--s-4); color: var(--muted); pointer-events: none; }
.search-field input { padding-inline-start: 2.75rem; border-radius: var(--r-pill); -webkit-appearance: none; appearance: none; }
.search-field.big input { min-height: var(--tap-lg); font-size: var(--fs-md); border-width: 2px; }
.search-field.big .search-go { position: absolute; inset-inline-end: .375rem; min-height: 2.5rem; padding-inline: var(--s-4); border-radius: var(--r-pill); }
.search-field.big input { padding-inline-end: 6rem; }

/* ---------- layout blocks ---------- */
.section { margin-block-start: var(--s-7); }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); margin-block-end: var(--s-3); }
.section-title { font-size: var(--fs-lg); display: flex; align-items: center; gap: var(--s-2); }
.section-title .icon { color: var(--brand); }
.count-pill { display: inline-block; min-width: 1.75rem; padding: 0 var(--s-2); border-radius: var(--r-pill); background: var(--surface); border: 1px solid var(--line);
  font-size: var(--fs-xs); font-weight: 700; color: var(--muted); text-align: center; line-height: 1.6; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: var(--s-5); margin-block-end: var(--s-4); }
.card > h2 { font-size: var(--fs-lg); margin-block-end: var(--s-3); display: flex; align-items: center; gap: var(--s-2); }
.card > h2 .icon { color: var(--brand); }

.page-head { display: flex; gap: var(--s-4); align-items: center; margin-block: var(--s-4) var(--s-5); }
.page-head h1 { font-size: var(--fs-2xl); }
.page-head p { margin: var(--s-1) 0 0; color: var(--muted); }
.page-icon { width: 3.5rem; height: 3.5rem; flex: none; display: grid; place-items: center; border-radius: var(--r-lg); color: var(--brand);
  background: linear-gradient(150deg, var(--brand-soft) 0%, color-mix(in srgb, var(--brand-soft) 45%, #fff) 100%);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--brand) 14%, transparent); }
.page-icon .icon { width: 2rem; height: 2rem; }

/* per-subject colours: same icon + same colour everywhere the subject appears */
.tone-blue { --brand: #1d4ed8; --brand-soft: #e2ebff; }
.tone-sky { --brand: #0369a1; --brand-soft: #dff1fb; }
.tone-cyan { --brand: #0e7490; --brand-soft: #dcf4f8; }
.tone-teal { --brand: #0f766e; --brand-soft: #d9f3ef; }
.tone-emerald { --brand: #047857; --brand-soft: #d8f5e7; }
.tone-green { --brand: #3f7a1a; --brand-soft: #e6f4d8; }
.tone-amber { --brand: #a15c07; --brand-soft: #fdefd3; }
.tone-orange { --brand: #c2410c; --brand-soft: #ffe8da; }
.tone-rose { --brand: #be123c; --brand-soft: #ffe2e8; }
.tone-pink { --brand: #be185d; --brand-soft: #fde4f1; }
.tone-violet { --brand: #6d28d9; --brand-soft: #ede5ff; }
.tone-indigo { --brand: #4338ca; --brand-soft: #e6e6ff; }
.tone-slate { --brand: #475569; --brand-soft: #e7ebf0; }

/* alerts (always icon + text, never colour alone) */
.alert { display: flex; gap: var(--s-3); align-items: flex-start; border-radius: var(--r-md); padding: var(--s-3) var(--s-4); margin-block: var(--s-3); border: 1px solid; font-size: var(--fs-sm); }
.alert > .icon { margin-block-start: .1em; }
.alert p:last-child { margin: 0; }
.alert-info { background: #eef4fb; border-color: #c9dbf2; color: #1e3a5f; }
.alert-warn { background: var(--warn-soft); border-color: #f5d9a8; color: var(--warn); }
.alert-ok { background: var(--ok-soft); border-color: #bfe3c9; color: #14532d; }
.alert-bad { background: var(--bad-soft); border-color: #f4c2c2; color: #7f1d1d; }

/* tags */
.tag { display: inline-flex; align-items: center; gap: .25rem; font-size: var(--fs-xs); font-weight: 700; padding: .125rem var(--s-2); border-radius: var(--r-pill);
  background: #eef1f4; color: var(--ink-2); line-height: 1.5; max-width: 100%; }
.tag .icon { width: 1em; height: 1em; }
.tag-ok { background: var(--ok-soft); color: #166534; }
.tag-warn { background: var(--bad-soft); color: #991b1b; }
.tag-pending { background: var(--warn-soft); color: var(--warn); }
.tag-new { background: #e0ecff; color: #1e40af; }
.tag-old { background: #eef1f4; color: var(--ink-2); }

/* ---------- home ---------- */
.hero { padding-block: var(--s-6) var(--s-4); text-align: center; }
.hero h1 { font-size: var(--fs-2xl); }
.hero p { color: var(--muted); margin-block: var(--s-1) var(--s-4); font-size: var(--fs-md); }
.hero form { max-width: 38rem; margin-inline: auto; }
.continue-card { display: flex; align-items: center; gap: var(--s-3); padding: var(--s-3) var(--s-4); background: var(--surface); border: 2px solid var(--brand);
  border-radius: var(--r-lg); text-decoration: none; color: var(--ink); min-height: 4rem; }
.continue-card .cover { width: 2.75rem; height: 3.5rem; }
.continue-card b { display: block; font-size: var(--fs-base); }
.continue-card .go { margin-inline-start: auto; color: var(--brand); }

.stage-block { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: var(--s-4); margin-block-end: var(--s-3); }
.stage-block-head { display: flex; align-items: center; gap: var(--s-3); margin-block-end: var(--s-3); color: var(--ink); text-decoration: none; }
.stage-block-head .page-icon { width: 3rem; height: 3rem; border-radius: var(--r-md); }
.stage-block-head .page-icon .icon { width: 1.75rem; height: 1.75rem; }
.stage-block-head h3 { font-size: var(--fs-lg); flex: 1; }
.stage-block-head .more { font-size: var(--fs-sm); color: var(--brand); font-weight: 700; display: inline-flex; align-items: center; gap: var(--s-1); }
.grade-grid { display: grid; gap: var(--s-2); grid-template-columns: repeat(auto-fill, minmax(min(9rem, 100%), 1fr)); }
.grade-btn { display: flex; align-items: center; gap: var(--s-3); min-height: 3.5rem; padding: var(--s-2) var(--s-3); border-radius: var(--r-md);
  background: var(--brand-soft); color: var(--ink); text-decoration: none; font-weight: 700; border: 2px solid transparent; }
.grade-btn:hover { border-color: var(--brand); }
.grade-num { width: 2.25rem; height: 2.25rem; flex: none; display: grid; place-items: center; border-radius: var(--r-sm); background: var(--brand); color: #fff;
  font-size: var(--fs-md); font-weight: 800; padding-block-start: .1em; }
.grade-btn small { display: block; font-size: var(--fs-xs); color: var(--muted); font-weight: 500; }

.tile-grid { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fill, minmax(min(15rem, 100%), 1fr)); }
.tile { display: flex; align-items: center; gap: var(--s-3); min-height: 4.25rem; padding: var(--s-3) var(--s-4); background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); text-decoration: none; color: var(--ink); }
.tile:hover { border-color: var(--brand); }
.tile .page-icon { width: 3rem; height: 3rem; border-radius: var(--r-md); }
.tile .page-icon .icon { width: 1.75rem; height: 1.75rem; }
.tile b { display: block; }
.tile small { color: var(--muted); font-size: var(--fs-sm); }
.tile .go, .grade-card .go { margin-inline-start: auto; color: var(--muted); }

/* ---------- stage / grade / subject ---------- */
.grade-list { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fill, minmax(min(16rem, 100%), 1fr)); }
.grade-card { display: flex; align-items: center; gap: var(--s-4); min-height: 5rem; padding: var(--s-4); background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); text-decoration: none; color: var(--ink); }
.grade-card:hover { border-color: var(--brand); }
.grade-card .grade-num { width: 3rem; height: 3rem; font-size: var(--fs-xl); border-radius: var(--r-md); }
.grade-card b { display: block; font-size: var(--fs-lg); }
.grade-card small { color: var(--muted); font-size: var(--fs-sm); }

.group-title { font-size: var(--fs-md); color: var(--ink-2); margin-block: var(--s-5) var(--s-3); }
.subject-grid { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fill, minmax(min(9.5rem, 100%), 1fr)); }
.subject-card { display: grid; justify-items: center; align-content: start; text-align: center; gap: var(--s-2); padding: var(--s-4) var(--s-3); min-height: 9rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); text-decoration: none; color: var(--ink); }
.subject-card:hover { border-color: var(--brand); }
.subject-card .page-icon { width: 4rem; height: 4rem; border-radius: 1.25rem; }
.subject-card .page-icon .icon { width: 2.25rem; height: 2.25rem; }
.subject-card:hover .page-icon { transform: translateY(-2px); }
.subject-card .page-icon { transition: transform .15s; }
.subject-name { font-weight: 800; font-size: var(--fs-md); line-height: 1.4; }
.subject-counts { color: var(--muted); font-size: var(--fs-sm); }
.subject-card.is-empty { background: transparent; border-style: dashed; }
.subject-card.is-empty .page-icon { background: #eef1f4; color: var(--muted); }

/* ---------- item list ---------- */
.item-list { display: grid; gap: var(--s-2); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 48em) { .item-list.two { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.item-card { display: flex; align-items: center; gap: var(--s-3); padding: var(--s-3); min-height: 5rem; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); text-decoration: none; color: var(--ink); }
.item-card:hover { border-color: var(--brand); }
.item-body { flex: 1; min-width: 0; display: grid; gap: .125rem; }
.item-title { font-weight: 800; font-size: var(--fs-base); line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.item-sub { color: var(--muted); font-size: var(--fs-sm); }
.item-meta { display: flex; flex-wrap: wrap; gap: var(--s-1); margin-block-start: .125rem; }
.item-card .go { color: var(--muted); }

/* generated cover: a calm coloured book spine with the subject icon */
.cover { position: relative; flex: none; width: 3.25rem; height: 4.25rem; border-radius: .375rem .75rem .75rem .375rem; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); box-shadow: inset -.3rem 0 0 color-mix(in srgb, var(--brand) 25%, transparent); }
.cover .icon { width: 1.75rem; height: 1.75rem; }
.cover.lg { width: 5.5rem; height: 7.25rem; border-radius: .5rem 1rem 1rem .5rem; }
.cover.lg .icon { width: 3rem; height: 3rem; }
.cover.kind-exams { background: #fff4e0; color: var(--accent); box-shadow: inset -.3rem 0 0 #f5d9a8; }
.cover.kind-resources { background: #eef1f4; color: var(--ink-2); box-shadow: inset -.3rem 0 0 var(--line-strong); }

/* ---------- book / item detail ---------- */
.book-hero { display: flex; gap: var(--s-4); align-items: flex-start; margin-block: var(--s-4); }
.book-hero h1 { font-size: var(--fs-xl); }
.book-hero .item-sub { font-size: var(--fs-base); margin-block-start: var(--s-1); }
.book-actions { display: grid; gap: var(--s-2); margin-block: var(--s-4); }
.book-actions .secondary { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(8.5rem, 100%), 1fr)); gap: var(--s-2); }
@media (min-width: 40em) {
  .book-actions { grid-template-columns: auto 1fr; align-items: center; }
  .book-actions .secondary { display: flex; flex-wrap: wrap; }
}
.file-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2) var(--s-3); padding-block: var(--s-3); border-block-start: 1px solid var(--line); }
.file-row:first-of-type { border-block-start: 0; padding-block-start: 0; }
.file-row .file-name { flex: 1 1 12rem; min-width: 0; }
.file-row .file-name b { display: block; }
.detail-grid { display: grid; gap: var(--s-4); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 64em) { .detail-grid { grid-template-columns: minmax(0, 1.7fr) minmax(18rem, 1fr); align-items: start; } }

.facts { margin: 0; display: grid; }
.facts > div { display: grid; grid-template-columns: 1fr; gap: 0; padding-block: var(--s-2); border-block-end: 1px solid var(--line); }
.facts > div:last-child { border-block-end: 0; }
.facts dt { color: var(--muted); font-size: var(--fs-sm); }
.facts dd { margin: 0; }
@media (min-width: 30em) { .facts > div { grid-template-columns: 9rem 1fr; gap: var(--s-3); } }

.disclosure { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); margin-block-end: var(--s-4); }
.disclosure > summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: var(--s-2); min-height: 3.25rem; padding: var(--s-2) var(--s-5); font-weight: 800; }
.disclosure > summary::-webkit-details-marker { display: none; }
.disclosure > summary .chev { margin-inline-start: auto; transition: transform .15s; }
.disclosure[open] > summary .chev { transform: rotate(180deg); }
.disclosure > summary .icon:first-child { color: var(--brand); }
.disclosure-body { padding: 0 var(--s-5) var(--s-4); }
.disclosure ul { margin: 0; padding-inline-start: var(--s-5); }
.disclosure li { margin-block: var(--s-1); font-size: var(--fs-sm); }

/* table of contents */
.toc, .toc ol { list-style: none; margin: 0; padding: 0; }
.toc ol { padding-inline-start: min(var(--s-4), 3vw); border-inline-start: 2px solid var(--line); margin-inline-start: min(var(--s-2), 1.5vw); }
.toc li { min-width: 0; }
.toc li { padding-block: var(--s-1); }
.toc-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 var(--s-2); min-height: 2rem; }
.toc-title { flex: 1 1 10rem; min-width: 0; }
.toc-unit > .toc-row .toc-title, .toc-section > .toc-row .toc-title, .toc-part > .toc-row .toc-title { font-weight: 800; }
.toc-page { color: var(--muted); font-size: var(--fs-sm); white-space: nowrap; }
.toc-flag { font-size: var(--fs-xs); color: var(--warn); }

.source-line { color: var(--muted); font-size: var(--fs-sm); margin-block-start: var(--s-6); display: flex; align-items: center; gap: var(--s-2); flex-wrap: wrap; }

/* ---------- search ---------- */
.search-panel { display: grid; gap: var(--s-3); }
.filters { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fit, minmax(min(10rem, 100%), 1fr)); align-items: end; }
.filters label { display: grid; gap: var(--s-1); font-size: var(--fs-sm); color: var(--muted); font-weight: 700; }
.chip-row { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.chip { display: inline-flex; align-items: center; gap: var(--s-2); min-height: var(--tap); padding: var(--s-1) var(--s-4); border-radius: var(--r-pill);
  background: var(--surface); border: 1px solid var(--line-strong); color: var(--ink); text-decoration: none; font-weight: 700; }
.chip:hover, .chip[aria-current="true"] { border-color: var(--brand); color: var(--brand); background: var(--brand-soft); }
.result-count { color: var(--muted); font-size: var(--fs-sm); margin-block: var(--s-4) var(--s-2); }

/* ---------- states ---------- */
.empty-state { text-align: center; padding: var(--s-7) var(--s-4); background: var(--surface); border: 1px dashed var(--line-strong); border-radius: var(--r-lg); }
.empty-state .page-icon { margin: 0 auto var(--s-3); width: 4rem; height: 4rem; }
.empty-state h1, .empty-state h2 { font-size: var(--fs-lg); margin-block-end: var(--s-2); }
.empty-state p { color: var(--muted); max-width: 32rem; margin-inline: auto; }
.empty-state .btn-row { justify-content: center; }
.spinner { width: 2.5rem; height: 2.5rem; border: 4px solid var(--brand-soft); border-block-start-color: var(--brand); border-radius: 50%; animation: spin .8s linear infinite; }

/* ---------- stats & tables (about + admin) ---------- */
.stat-grid { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fill, minmax(min(9rem, 100%), 1fr)); margin-block: var(--s-4); }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: var(--s-3) var(--s-4); display: grid; }
.stat b { font-size: var(--fs-xl); }
.stat span { color: var(--muted); font-size: var(--fs-sm); }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
.table { width: 100%; border-collapse: collapse; font-size: var(--fs-sm); overflow-wrap: normal; }
.table th, .table td { text-align: start; padding: var(--s-2) var(--s-3); border-block-end: 1px solid var(--line); vertical-align: top; }
.table th { background: var(--bg); font-weight: 700; white-space: nowrap; }
.prose ul { padding-inline-start: var(--s-5); }

/* ---------- footer ---------- */
.site-footer { border-block-start: 1px solid var(--line); background: var(--surface); padding-block: var(--s-5); font-size: var(--fs-sm); color: var(--muted); }
.site-footer p { margin-block: var(--s-1); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: var(--s-1) var(--s-4); margin-block-end: var(--s-2); }
.site-footer nav a { display: inline-flex; align-items: center; min-height: var(--tap); font-weight: 700; }
.site-footer .copyright { margin-block-start: var(--s-3); padding-block-start: var(--s-3); border-block-start: 1px solid var(--line); font-weight: 700; color: var(--ink-2); }

/* rights notice (home) */
.notice-list { display: grid; gap: var(--s-3); }
.notice { background: var(--surface); border: 1px solid var(--line); border-inline-start: .25rem solid var(--ink-2); border-radius: var(--r-md); padding: var(--s-4); }
.notice h3 { display: flex; align-items: center; gap: var(--s-2); font-size: var(--fs-md); margin-block-end: var(--s-2); }
.notice h3 .icon { color: var(--brand); }
.notice p { margin: 0; color: var(--ink-2); font-size: var(--fs-sm); line-height: 1.9; }
.notice-contact { background: #eef4fb; border-inline-start-color: #1d4ed8; }
.notice-contact a { font-weight: 800; color: #1d4ed8; }

/* ---------- reader ---------- */
body.reader { height: 100dvh; display: flex; flex-direction: column; overflow: hidden; background: #1f2937; }
.reader-bar { display: flex; align-items: center; gap: var(--s-1); min-height: var(--appbar-h); padding-inline: var(--s-1); background: var(--surface);
  border-block-end: 1px solid var(--line); padding-block-start: env(safe-area-inset-top, 0); }
.reader-bar .appbar-title { font-size: var(--fs-base); }
.reader-stage { position: relative; flex: 1; min-height: 0; }
.reader-stage iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: #e5e7eb; }
.reader-overlay { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: var(--s-3); padding: var(--s-5); text-align: center;
  background: var(--bg); color: var(--ink); }
.reader-overlay p { max-width: 26rem; }
.reader-panel { position: absolute; inset-block: 0; inset-inline-start: 0; width: min(22rem, 88vw); background: var(--surface); z-index: 5; overflow-y: auto;
  box-shadow: var(--shadow-2); padding: var(--s-4); padding-block-end: calc(var(--s-6) + env(safe-area-inset-bottom, 0px)); }
.reader-panel h2 { font-size: var(--fs-md); display: flex; align-items: center; justify-content: space-between; margin-block-end: var(--s-3); }
.reader-panel .toc a, .reader-panel .toc button { all: unset; display: flex; gap: var(--s-2); align-items: baseline; width: 100%; min-height: var(--tap); cursor: pointer;
  border-radius: var(--r-sm); padding-inline: var(--s-2); box-sizing: border-box; }
.reader-panel .toc button:hover, .reader-panel .toc button:focus-visible { background: var(--bg); outline: 3px solid var(--focus); }
.reader-panel .toc .toc-row { min-height: 0; }
.reader-mode { display: flex; gap: var(--s-2); flex-wrap: wrap; margin-block: var(--s-3); }
.reader-tools { display: flex; align-items: center; gap: var(--s-1); }
@media (max-width: 30em) { .reader-tools .hide-sm { display: none; } }

/* ---------- motion & small screens ---------- */
@media (max-width: 40em) {
  .page-head h1 { font-size: var(--fs-xl); }
  .page-icon { width: 3rem; height: 3rem; }
  .card { padding: var(--s-4); }
  .disclosure > summary { padding-inline: var(--s-4); }
  .disclosure-body { padding-inline: var(--s-4); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}