/* kcrp_edu — mobile-first, RTL/LTR via logical properties */
:root{
  --primary:#1E40AF;
  --primary-dark:#1e3a8a;
  --accent:#F59E0B;
  --bg:#F9FAFB;
  --surface:#ffffff;
  --text:#0f172a;
  --text-muted:#64748b;
  --border:#e2e8f0;
  --radius:14px;
  --shadow:0 1px 3px rgba(0,0,0,.06),0 4px 12px rgba(0,0,0,.04);
  --tap:48px;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0f172a; --surface:#1e293b; --text:#f1f5f9; --text-muted:#94a3b8; --border:#334155; }
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:'Vazirmatn','Cairo','Inter',system-ui,sans-serif;-webkit-font-smoothing:antialiased}
body.lang-ar{font-family:'Cairo',system-ui,sans-serif}
body.lang-en{font-family:'Inter',system-ui,sans-serif}
button{font:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}
input,select,button{font:inherit;color:inherit}

/* Header */
.app-header{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:10px;
  padding:12px 16px;background:var(--surface);
  border-block-end:1px solid var(--border);
  box-shadow:var(--shadow);
}
.app-title{font-size:18px;font-weight:700;margin:0;flex:1;text-align:start}
.brand{display:flex;align-items:center;gap:10px;flex:1;color:inherit;text-decoration:none}
.brand-logo{height:40px;width:auto;border-radius:8px;object-fit:contain}
.brand-logo-placeholder{
  width:40px;height:40px;border-radius:10px;
  background:linear-gradient(135deg,#1E40AF,#7c3aed);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:18px;
}
.brand-name{font-weight:700;font-size:17px}
.back-btn[hidden]{display:none}
.back-btn,.icon-btn{
  width:var(--tap);height:var(--tap);min-width:var(--tap);
  display:flex;align-items:center;justify-content:center;
  background:transparent;border:none;border-radius:10px;color:var(--text);
}
.back-btn:hover,.icon-btn:hover{background:var(--bg)}
[dir=rtl] .back-btn svg{transform:scaleX(-1)}
.header-actions{display:flex;align-items:center;gap:6px}
.lang-switch{
  background:var(--bg);border:1px solid var(--border);
  border-radius:8px;padding:6px 10px;height:40px;
}

.search-bar{padding:10px 16px;background:var(--surface);border-block-end:1px solid var(--border)}
.search-bar input{
  width:100%;padding:12px 16px;border:1px solid var(--border);
  border-radius:12px;background:var(--bg);font-size:16px;
}

.breadcrumbs{
  padding:14px 16px;font-size:15px;color:var(--text-muted);
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  max-width:1100px;margin:0 auto;
}
.breadcrumbs:empty{display:none}
.crumb-link{
  color:#1E40AF;font-weight:600;text-decoration:none;
  padding:4px 10px;border-radius:8px;
  transition:all .15s;
}
.crumb-link:hover{background:rgba(30,64,175,.08);text-decoration:none}
.crumb-current{
  color:var(--text);font-weight:700;
  padding:4px 10px;
}
.crumb-sep{color:var(--text-muted);font-weight:300;font-size:18px;opacity:.5}
[dir=rtl] .crumb-sep{transform:scaleX(-1);display:inline-block}
@media (prefers-color-scheme: dark){
  .crumb-link{color:#93c5fd}
  .crumb-link:hover{background:rgba(96,165,250,.12)}
}

.app-main{padding:16px;max-width:1100px;margin:0 auto}
.section-h{font-size:16px;font-weight:700;margin:0 0 14px;color:var(--text)}
.loading{text-align:center;padding:60px 20px;color:var(--text-muted)}

/* Grid + cards */
.grid{display:grid;gap:16px;grid-template-columns:repeat(2,1fr)}
@media (min-width:600px){.grid{grid-template-columns:repeat(3,1fr);gap:18px}}
@media (min-width:900px){.grid{grid-template-columns:repeat(4,1fr);gap:22px}}
@media (min-width:1200px){.grid{grid-template-columns:repeat(5,1fr)}}

.card{
  background:var(--surface);border-radius:var(--radius);
  padding:0;box-shadow:var(--shadow);
  display:flex;flex-direction:column;
  text-align:center;overflow:hidden;
  border:1px solid var(--border);
  transition:transform .25s cubic-bezier(.2,.9,.3,1.2),box-shadow .25s,border-color .2s;
  cursor:pointer;
}
.card:hover{
  transform:translateY(-6px) scale(1.02);
  box-shadow:0 12px 28px rgba(30,64,175,.18),0 4px 8px rgba(0,0,0,.05);
  border-color:#1E40AF;
}
.card:active{transform:translateY(-2px) scale(1.0)}
.card-image{
  width:100%;aspect-ratio:3/4;
  background:linear-gradient(135deg,#1E40AF,#7c3aed);
  background-size:cover;background-position:center;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:64px;font-weight:800;
  position:relative;
}
.card-image::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 70%,rgba(0,0,0,.25));
}

/* Compact variant for grade cards (small icons / simple thumbnails) */
.card.grade-card .card-image{
  aspect-ratio:1/1;
  font-size:56px;
}
.card-body{padding:14px 14px 16px;text-align:center}
.card-icon{
  width:56px;height:56px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  font-size:28px;color:#fff;background:var(--primary);
  margin:14px auto 0;
}
.card-title{font-weight:700;font-size:15px;margin-top:4px;line-height:1.3}
.card-meta{font-size:12px;color:var(--text-muted);margin-top:6px;font-weight:500}

/* Floating completion badge on subject card */
.card{position:relative}
.card-progress{
  position:absolute;top:10px;inset-inline-end:10px;
  display:inline-flex;align-items:center;gap:4px;
  padding:5px 10px;border-radius:14px;
  font-size:12px;font-weight:700;
  border:1.5px solid;
  backdrop-filter:blur(8px);
  z-index:2;
}
.card-progress svg{flex-shrink:0}
.card-progress.p-empty{background:rgba(241,245,249,.92);color:#475569;border-color:#cbd5e1}
.card-progress.p-low  {background:rgba(254,242,242,.92);color:#dc2626;border-color:#fca5a5}
.card-progress.p-mid  {background:rgba(255,251,235,.92);color:#d97706;border-color:#fcd34d}
.card-progress.p-done {background:rgba(240,253,244,.92);color:#16a34a;border-color:#86efac}

/* Lesson list */
.lesson-list{display:flex;flex-direction:column;gap:12px}
.lesson-item{
  display:flex;gap:14px;background:var(--surface);
  border-radius:var(--radius);padding:12px;
  box-shadow:var(--shadow);align-items:center;
  border:1px solid var(--border);
}
.lesson-thumb{
  width:120px;aspect-ratio:16/9;border-radius:10px;
  background:#000;flex-shrink:0;background-size:cover;background-position:center;
  position:relative;
}
.lesson-thumb::after{
  content:"▶";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:24px;text-shadow:0 2px 6px rgba(0,0,0,.6);
}
.lesson-info{flex:1;min-width:0}
.lesson-title{font-weight:600;font-size:15px;margin:0 0 6px;line-height:1.4}
.lesson-duration{font-size:12px;color:var(--text-muted)}
.lesson-meta{display:flex;gap:14px;font-size:12px;color:var(--text-muted)}
.lesson-meta .meta-item{display:inline-flex;align-items:center;gap:4px;font-weight:500}
.eye-ico{vertical-align:-2px;opacity:.75}

/* Watch-progress bar (lesson page) */
.watch-progress{margin:18px 0 4px}
.watch-progress-bar{
  width:100%;height:8px;
  background:var(--border);border-radius:6px;overflow:hidden;
  position:relative;
}
.watch-progress-fill{
  height:100%;
  background:linear-gradient(90deg,#1E40AF,#10b981);
  border-radius:6px;
  transition:width .4s ease;
  width:0%;
}
.watch-progress-text{
  margin-top:6px;font-size:12px;color:var(--text-muted);
  font-weight:600;font-variant-numeric:tabular-nums;
  text-align:end;
}

/* Header progress pill (visible on lesson pages) */
.progress-pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 12px;height:40px;
  border-radius:20px;
  font-weight:700;font-size:13px;
  text-decoration:none;
  border:1.5px solid transparent;
  transition:all .2s;
  white-space:nowrap;
}
.progress-pill[hidden]{display:none}
.progress-pill svg{flex-shrink:0}
.progress-pill:hover{transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.12)}
.progress-pill.p-empty{background:#f1f5f9;color:#64748b;border-color:#e2e8f0}
.progress-pill.p-low  {background:#fef2f2;color:#dc2626;border-color:#fecaca}
.progress-pill.p-mid  {background:#fffbeb;color:#d97706;border-color:#fde68a}
.progress-pill.p-done {background:#f0fdf4;color:#16a34a;border-color:#bbf7d0}
@media (prefers-color-scheme: dark){
  .progress-pill.p-empty{background:#1e293b;color:#94a3b8;border-color:#334155}
  .progress-pill.p-low  {background:#3f1d1d;color:#fca5a5;border-color:#7f1d1d}
  .progress-pill.p-mid  {background:#3a2a0d;color:#fcd34d;border-color:#78350f}
  .progress-pill.p-done {background:#0d2818;color:#86efac;border-color:#166534}
}

/* Continue-watching tags */
.cw-item{position:relative;flex-wrap:wrap}
.cw-tags{
  display:flex;flex-direction:column;gap:6px;
  margin-inline-start:auto;align-items:flex-end;
  flex-shrink:0;
}
.cw-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 10px;border-radius:20px;
  background:rgba(30,64,175,.1);color:#1E40AF;
  font-size:11px;font-weight:600;
  white-space:nowrap;
}
.cw-tag:nth-child(2){background:rgba(245,158,11,.12);color:#b45309}
.cw-tag svg{flex-shrink:0}
@media (prefers-color-scheme: dark){
  .cw-tag{background:rgba(96,165,250,.15);color:#93c5fd}
  .cw-tag:nth-child(2){background:rgba(251,191,36,.15);color:#fcd34d}
}
@media (max-width:520px){
  .cw-tags{flex-direction:row;width:100%;margin-top:8px}
}

/* Favorites page */
.fav-item{position:relative;padding-inline-end:48px}
.fav-item .lesson-item-link{display:flex;gap:14px;flex:1;align-items:center;color:inherit;text-decoration:none}
.fav-remove{
  position:absolute;top:50%;inset-inline-end:12px;transform:translateY(-50%);
  width:34px;height:34px;border-radius:50%;
  background:#fef2f2;color:#dc2626;border:none;cursor:pointer;
  font-size:22px;line-height:1;
  display:flex;align-items:center;justify-content:center;
  transition:all .15s;
}
.fav-remove:hover{background:#dc2626;color:#fff;transform:translateY(-50%) scale(1.05)}

/* Player */
.player-wrap{
  background:#000;border-radius:var(--radius);overflow:hidden;
  aspect-ratio:16/9;margin-block-end:16px;
}
.player-wrap iframe{width:100%;height:100%;border:0}
.lesson-detail h2{
  margin:0 0 12px;font-size:32px;font-weight:800;
  line-height:1.2;color:var(--text);
  background:linear-gradient(90deg,#1E40AF,#7c3aed);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.lesson-detail p{color:var(--text-muted);line-height:1.7;font-size:15px;margin:0 0 8px}
.lesson-detail .section-h{
  font-size:20px;font-weight:800;
  margin:32px 0 16px;
  padding-block-end:10px;
  border-block-end:3px solid var(--accent);
  display:inline-block;
}
.player-actions{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}
.btn{
  padding:12px 18px;border-radius:12px;border:none;
  background:var(--primary);color:#fff;font-weight:600;min-height:var(--tap);
  display:inline-flex;align-items:center;gap:8px;
}
.btn.secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn.accent{background:var(--accent)}

/* Welcome form */
.welcome{
  max-width:420px;margin:30px auto;background:var(--surface);
  padding:28px;border-radius:var(--radius);box-shadow:var(--shadow);
  border:1px solid var(--border);
}
.welcome h2{margin-block-start:0}
.field{margin-block-end:14px}
.field label{display:block;font-size:13px;margin-block-end:6px;color:var(--text-muted)}
.field input,.field select{
  width:100%;padding:12px 14px;border:1px solid var(--border);
  border-radius:10px;background:var(--bg);min-height:var(--tap);
}
.welcome .btn{width:100%;justify-content:center;font-size:16px}

/* Skeletons */
.skel{background:linear-gradient(90deg,var(--border) 0%,#f1f5f9 50%,var(--border) 100%);background-size:200% 100%;animation:sk 1.2s infinite;border-radius:8px}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* Page transitions */
.page{animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.empty{text-align:center;padding:50px 20px;color:var(--text-muted)}

/* Error box */
.error-box{
  max-width:480px;margin:40px auto;padding:28px;text-align:center;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.error-icon{font-size:48px;margin-bottom:10px}
.error-box h3{margin:0 0 8px;color:#dc2626}
.error-box p{color:var(--text-muted);margin:8px 0 16px}
.error-detail{
  background:#fef2f2;color:#991b1b;padding:10px;border-radius:8px;
  font-size:12px;text-align:start;overflow:auto;max-height:140px;
  white-space:pre-wrap;word-break:break-word;margin-bottom:16px;
}
.err-inline{
  background:#fef2f2;color:#991b1b;padding:10px;border-radius:8px;
  margin-top:12px;font-size:13px;
}

/* Modern language switcher */
.lang-switch-wrap{position:relative}
.lang-btn{
  display:flex;align-items:center;gap:8px;
  padding:8px 12px;height:40px;
  background:var(--bg);border:1px solid var(--border);
  border-radius:10px;cursor:pointer;
  font-weight:600;font-size:13px;color:var(--text);
  transition:all .15s;
}
.lang-btn:hover{border-color:#1E40AF;background:var(--surface)}
.lang-flag{font-size:18px;line-height:1}
.lang-code{letter-spacing:.04em}
.lang-caret{transition:transform .2s;opacity:.6}
.lang-btn[aria-expanded="true"] .lang-caret{transform:rotate(180deg)}
.lang-menu{
  position:absolute;top:calc(100% + 8px);inset-inline-end:0;
  min-width:180px;background:var(--surface);
  border:1px solid var(--border);border-radius:12px;
  box-shadow:0 12px 32px rgba(0,0,0,.12),0 4px 8px rgba(0,0,0,.05);
  padding:6px;z-index:100;
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:all .18s cubic-bezier(.2,.9,.3,1.2);
}
.lang-menu.open{opacity:1;visibility:visible;transform:translateY(0)}
.lang-option{
  display:flex;align-items:center;gap:10px;width:100%;
  padding:10px 12px;background:transparent;border:none;
  border-radius:8px;cursor:pointer;color:var(--text);
  font-size:14px;font-weight:500;text-align:start;
}
.lang-option:hover{background:var(--bg)}
.lang-option.active{background:rgba(30,64,175,.08);color:#1E40AF;font-weight:600}
.lang-option .lang-label{flex:1}
.lang-check{color:#1E40AF;font-weight:700}

/* Modal popup */
.modal-overlay{
  position:fixed;inset:0;background:rgba(15,23,42,.5);
  display:flex;align-items:center;justify-content:center;
  z-index:1000;padding:20px;
  opacity:0;transition:opacity .2s;
  backdrop-filter:blur(4px);
}
.modal-overlay.open{opacity:1}
.modal-card{
  background:var(--surface);border-radius:20px;
  padding:32px 28px;max-width:420px;width:100%;
  box-shadow:0 24px 60px rgba(0,0,0,.25);
  position:relative;text-align:center;
  transform:scale(.92);transition:transform .25s cubic-bezier(.2,.9,.3,1.3);
}
.modal-overlay.open .modal-card{transform:scale(1)}
.modal-close{
  position:absolute;top:14px;inset-inline-end:14px;
  width:36px;height:36px;border-radius:50%;
  background:var(--bg);border:none;cursor:pointer;
  font-size:22px;line-height:1;color:var(--text-muted);
  display:flex;align-items:center;justify-content:center;
}
.modal-close:hover{background:var(--border);color:var(--text)}
.modal-icon{font-size:48px;margin-bottom:8px}
.modal-card h2{margin:0 0 6px;font-size:22px}
.modal-sub{color:var(--text-muted);margin:0 0 22px;font-size:14px}
.modal-field{margin-bottom:14px;text-align:start}
.modal-field label{
  display:block;font-size:12px;font-weight:600;
  color:var(--text-muted);margin-bottom:6px;
  text-transform:uppercase;letter-spacing:.04em;
}
.modal-field input{
  width:100%;padding:12px 14px;
  border:1px solid var(--border);border-radius:10px;
  background:var(--bg);font-size:15px;
  transition:all .15s;
}
.modal-field input:focus{
  outline:none;border-color:#1E40AF;
  box-shadow:0 0 0 3px rgba(30,64,175,.12);
}
.modal-actions{display:flex;gap:10px;margin-top:20px}
.modal-actions .btn{flex:1;justify-content:center}

/* Toast */
.app-toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%);
  background:#0f172a;color:#fff;padding:12px 22px;
  border-radius:10px;font-size:14px;font-weight:500;
  box-shadow:0 12px 24px rgba(0,0,0,.2);
  z-index:2000;
  animation:toastIn .3s,toastOut .3s 2.2s forwards;
}
.app-toast.error{background:#dc2626}
@keyframes toastIn{from{opacity:0;transform:translateX(-50%) translateY(20px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}
@keyframes toastOut{to{opacity:0;transform:translateX(-50%) translateY(20px)}}