/* ============================================================
   فهمني — منصة أ. مصطفى عبد المعبود لتدريس الرياضيات
   هوية بصرية مستوحاة من السبورة والطباشير وأدوات الهندسة
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@400;600;800;900&family=Tajawal:wght@400;500;700&display=swap');

:root{
  /* لوحة الألوان */
  --board:        #1E3D33;   /* أخضر السبورة الأساسي */
  --board-dark:   #16281F;   /* أخضر أغمق للتباين */
  --board-light:  #2A5045;   /* أخضر فاتح للبطاقات على السبورة */
  --chalk:        #F4EFE3;   /* لون الطباشير الأبيض/الكريمي */
  --paper:        #FBF9F4;   /* خلفية ورقة الكشكول */
  --pencil:       #22281F;   /* لون نص القلم الرصاص */
  --gold:         #D9A441;   /* طباشير ذهبي - للتمييز والعناوين */
  --gold-dark:    #B3812C;
  --error:        #C25B4E;   /* أحمر طباشير للتنبيهات */
  --success:      #5FA88E;   /* أخضر نعناعي للنجاح */
  --line:         #E4DFD2;

  --radius: 14px;
  --shadow: 0 6px 24px rgba(22,40,31,0.12);
  --font-display: 'Cairo', sans-serif;
  --font-body: 'Tajawal', sans-serif;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--pencil);
  direction: rtl;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font-family:inherit; cursor:pointer; border:none; }
input, select, textarea{ font-family:inherit; }
:focus-visible{ outline:3px solid var(--gold); outline-offset:2px; }

h1,h2,h3,h4{ font-family: var(--font-display); color: var(--board-dark); line-height:1.3; }

.container{ max-width:1180px; margin:0 auto; padding:0 24px; }

/* ---------- شارة "دائرة التصحيح" - العنصر المميز ---------- */
.circled{
  position:relative;
  display:inline-block;
  white-space:nowrap;
}
.circled::after{
  content:"";
  position:absolute;
  right:-6%; left:-6%; top:-18%; bottom:-14%;
  border:3px solid var(--gold);
  border-radius:50% 50% 48% 52% / 55% 48% 52% 45%;
  transform:rotate(-1.5deg);
  pointer-events:none;
}

/* ---------- Navbar ---------- */
.navbar{
  position:sticky; top:0; z-index:50;
  background: var(--board);
  color: var(--chalk);
  border-bottom:1px solid rgba(244,239,227,0.12);
}
.navbar .container{ display:flex; align-items:center; justify-content:space-between; height:72px; }
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:900; font-size:1.35rem; color:var(--chalk); }
.brand .mark{ width:38px; height:38px; }
.navlinks{ display:flex; align-items:center; gap:28px; font-weight:600; }
.navlinks a{ color: rgba(244,239,227,0.85); transition:color .15s; }
.navlinks a:hover{ color: var(--gold); }
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:12px 26px; border-radius:999px; font-weight:700; font-size:.95rem;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover{ transform:translateY(-1px); }
.btn-gold{ background:var(--gold); color:var(--board-dark); }
.btn-gold:hover{ background:var(--gold-dark); box-shadow:0 6px 18px rgba(217,164,65,.35); }
.btn-outline{ background:transparent; border:1.5px solid rgba(244,239,227,.5); color:var(--chalk); }
.btn-outline:hover{ border-color:var(--gold); color:var(--gold); }
.btn-dark{ background:var(--board-dark); color:var(--chalk); }
.btn-dark:hover{ background:var(--board); }
.btn-block{ width:100%; }
.btn-sm{ padding:8px 18px; font-size:.85rem; }
.btn-danger{ background:transparent; color:var(--error); border:1.5px solid var(--error); }

/* ---------- Hero ---------- */
.hero{
  background: radial-gradient(circle at 85% 20%, var(--board-light), var(--board) 55%, var(--board-dark) 100%);
  color: var(--chalk);
  padding:96px 0 120px;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(244,239,227,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244,239,227,.05) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image: radial-gradient(ellipse at 60% 30%, black, transparent 70%);
}
.hero .container{ position:relative; display:grid; grid-template-columns:1.1fr .9fr; gap:56px; align-items:center; }
.eyebrow{ display:inline-flex; align-items:center; gap:8px; background:rgba(217,164,65,.15); color:var(--gold); border:1px solid rgba(217,164,65,.4); padding:6px 16px; border-radius:999px; font-weight:700; font-size:.82rem; margin-bottom:22px; }
.hero h1{ color:var(--chalk); font-size:clamp(2.2rem, 4vw, 3.4rem); font-weight:900; margin-bottom:20px; }
.hero p.lead{ color:rgba(244,239,227,.8); font-size:1.15rem; max-width:520px; margin-bottom:32px; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }
.hero-stats{ display:flex; gap:36px; margin-top:48px; }
.hero-stats div strong{ display:block; font-family:var(--font-display); font-size:1.8rem; color:var(--gold); }
.hero-stats div span{ color:rgba(244,239,227,.65); font-size:.85rem; }

.chalkboard-card{
  background: var(--board-dark);
  border:1px solid rgba(244,239,227,.15);
  border-radius:20px;
  padding:32px;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}
.chalkboard-card .eq{ font-family:var(--font-display); font-size:1.6rem; color:var(--chalk); margin-bottom:10px; }
.chalkboard-card .eq .gold{ color:var(--gold); }
.chalkboard-card .step{ display:flex; gap:12px; align-items:flex-start; padding:12px 0; border-top:1px dashed rgba(244,239,227,.15); color:rgba(244,239,227,.75); font-size:.92rem; }
.chalkboard-card .step:first-of-type{ border-top:none; }
.chalkboard-card .step b{ color:var(--gold); font-family:var(--font-display); min-width:20px; }

/* ---------- Sections ---------- */
section{ padding:88px 0; }
.section-head{ max-width:640px; margin-bottom:52px; }
.section-head .eyebrow-light{ color:var(--gold-dark); font-weight:800; letter-spacing:.03em; font-size:.85rem; text-transform:uppercase; margin-bottom:10px; display:block; }
.section-head h2{ font-size:clamp(1.7rem,3vw,2.4rem); margin-bottom:14px; }
.section-head p{ color:#5A5F53; font-size:1.05rem; }

.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:26px; }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:26px; }

.card{ background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:28px; box-shadow: var(--shadow); }
.card h3{ font-size:1.15rem; margin-bottom:10px; }
.card p{ color:#5A5F53; font-size:.95rem; }
.card .num{ font-family:var(--font-display); font-weight:900; font-size:1.4rem; color:var(--gold); margin-bottom:14px; }

.course-card{ background:#fff; border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; box-shadow:var(--shadow); transition:transform .15s; display:flex; flex-direction:column; }
.course-card:hover{ transform:translateY(-4px); }
.course-card .cover{ height:150px; background:linear-gradient(135deg, var(--board), var(--board-light)); display:flex; align-items:center; justify-content:center; color:var(--gold); font-family:var(--font-display); font-size:2.2rem; font-weight:900; }
.course-card .body{ padding:20px; flex:1; display:flex; flex-direction:column; gap:10px; }
.course-card .price{ font-family:var(--font-display); font-weight:800; color:var(--board-dark); }
.course-card .meta{ font-size:.82rem; color:#8A8F80; }
.badge{ display:inline-block; padding:3px 12px; border-radius:999px; font-size:.75rem; font-weight:700; }
.badge-gold{ background:rgba(217,164,65,.15); color:var(--gold-dark); }
.badge-green{ background:rgba(95,168,142,.15); color:var(--success); }
.badge-red{ background:rgba(194,91,78,.15); color:var(--error); }

.about-teacher{ background:var(--board-dark); color:var(--chalk); border-radius:24px; padding:56px; display:grid; grid-template-columns:.7fr 1.3fr; gap:48px; align-items:center; }
.teacher-avatar{ width:100%; aspect-ratio:1; border-radius:20px; background:linear-gradient(135deg, var(--gold), var(--gold-dark)); display:flex; align-items:center; justify-content:center; font-family:var(--font-display); font-size:4rem; font-weight:900; color:var(--board-dark); }
.about-teacher h2{ color:var(--chalk); }
.about-teacher p{ color:rgba(244,239,227,.75); }
.pill-list{ display:flex; flex-wrap:wrap; gap:10px; margin-top:20px; }
.pill{ background:rgba(244,239,227,.08); border:1px solid rgba(244,239,227,.18); padding:8px 16px; border-radius:999px; font-size:.85rem; }

footer{ background:var(--board-dark); color:rgba(244,239,227,.55); padding:40px 0; text-align:center; font-size:.9rem; }
footer a{ color:var(--gold); }

/* ---------- Auth ---------- */
.auth-wrap{ min-height:100vh; display:flex; align-items:center; justify-content:center; background:var(--board-dark); padding:24px; }
.auth-box{ background:#fff; width:100%; max-width:440px; border-radius:20px; padding:40px; box-shadow:0 30px 80px rgba(0,0,0,.4); }
.auth-box .brand{ color:var(--board-dark); justify-content:center; margin-bottom:8px; }
.auth-box h2{ text-align:center; margin-bottom:4px; }
.auth-box p.sub{ text-align:center; color:#8A8F80; margin-bottom:28px; font-size:.9rem; }
.field{ margin-bottom:16px; }
.field label{ display:block; font-weight:700; font-size:.88rem; margin-bottom:6px; color:var(--board-dark); }
.field input, .field select, .field textarea{
  width:100%; padding:12px 14px; border:1.5px solid var(--line); border-radius:10px; font-size:.95rem; background:var(--paper);
  transition:border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus{ border-color:var(--gold); }
.role-toggle{ display:flex; gap:10px; margin-bottom:20px; }
.role-toggle label{ flex:1; text-align:center; padding:12px; border:1.5px solid var(--line); border-radius:10px; font-weight:700; cursor:pointer; font-size:.9rem; }
.role-toggle input{ display:none; }
.role-toggle input:checked + span{ color:var(--gold-dark); }
.role-toggle label:has(input:checked){ border-color:var(--gold); background:rgba(217,164,65,.08); }
.switch-line{ text-align:center; margin-top:20px; font-size:.9rem; color:#8A8F80; }
.switch-line a{ color:var(--gold-dark); font-weight:700; }
.error-msg{ background:rgba(194,91,78,.1); color:var(--error); padding:10px 14px; border-radius:10px; font-size:.85rem; margin-bottom:16px; display:none; }
.success-msg{ background:rgba(95,168,142,.1); color:var(--success); padding:10px 14px; border-radius:10px; font-size:.85rem; margin-bottom:16px; display:none; }

/* ---------- Dashboard shell ---------- */
.dash{ display:grid; grid-template-columns:260px 1fr; min-height:100vh; }
.sidebar{ background:var(--board-dark); color:var(--chalk); padding:28px 20px; display:flex; flex-direction:column; }
.sidebar .brand{ margin-bottom:36px; padding:0 8px; }
.sidebar nav{ display:flex; flex-direction:column; gap:4px; flex:1; }
.sidebar nav a{ padding:12px 14px; border-radius:10px; font-weight:600; font-size:.92rem; color:rgba(244,239,227,.7); display:flex; align-items:center; gap:10px; }
.sidebar nav a:hover, .sidebar nav a.active{ background:rgba(217,164,65,.12); color:var(--gold); }
.sidebar .user-box{ border-top:1px solid rgba(244,239,227,.12); padding-top:16px; margin-top:16px; font-size:.85rem; }
.sidebar .user-box .name{ font-weight:700; color:var(--chalk); }
.main{ padding:36px 40px; background:var(--paper); }
.main-head{ display:flex; justify-content:space-between; align-items:center; margin-bottom:32px; flex-wrap:wrap; gap:14px; }
.main-head h1{ font-size:1.6rem; }
.stat-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; margin-bottom:32px; }
.stat-box{ background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:20px; }
.stat-box .val{ font-family:var(--font-display); font-weight:900; font-size:1.7rem; color:var(--board-dark); }
.stat-box .label{ color:#8A8F80; font-size:.82rem; margin-top:4px; }

table{ width:100%; border-collapse:collapse; background:#fff; border-radius:var(--radius); overflow:hidden; box-shadow:var(--shadow); }
th, td{ padding:14px 16px; text-align:right; font-size:.9rem; border-bottom:1px solid var(--line); }
th{ background:var(--board); color:var(--chalk); font-weight:700; font-size:.82rem; }
tr:last-child td{ border-bottom:none; }

.modal-overlay{ position:fixed; inset:0; background:rgba(22,40,31,.6); display:none; align-items:center; justify-content:center; z-index:100; padding:20px; }
.modal-overlay.open{ display:flex; }
.modal{ background:#fff; border-radius:18px; padding:32px; width:100%; max-width:520px; max-height:88vh; overflow-y:auto; }
.modal h3{ margin-bottom:20px; }
.modal-close{ float:left; background:var(--paper); width:32px; height:32px; border-radius:50%; font-size:1.1rem; }

.tabs{ display:flex; gap:8px; margin-bottom:24px; border-bottom:1px solid var(--line); }
.tabs button{ background:none; padding:12px 18px; font-weight:700; color:#8A8F80; border-bottom:2px solid transparent; }
.tabs button.active{ color:var(--board-dark); border-color:var(--gold); }

.lesson-row, .assign-row{ display:flex; align-items:center; justify-content:space-between; background:#fff; border:1px solid var(--line); border-radius:12px; padding:16px 20px; margin-bottom:12px; }
.lesson-row .info b, .assign-row .info b{ display:block; margin-bottom:2px; }
.lesson-row .info span, .assign-row .info span{ color:#8A8F80; font-size:.82rem; }
.actions-row{ display:flex; gap:8px; }

.empty-state{ text-align:center; padding:60px 20px; color:#8A8F80; }
.empty-state .icon{ font-size:2.4rem; margin-bottom:12px; }

.video-frame{ width:100%; aspect-ratio:16/9; border-radius:14px; overflow:hidden; background:var(--board-dark); }
.video-frame iframe, .video-frame video{ width:100%; height:100%; border:0; }

.jitsi-wrap{ width:100%; height:70vh; border-radius:14px; overflow:hidden; background:var(--board-dark); }

@media (max-width: 960px){
  .hero .container{ grid-template-columns:1fr; }
  .grid-3, .grid-2{ grid-template-columns:1fr; }
  .about-teacher{ grid-template-columns:1fr; padding:32px; }
  .dash{ grid-template-columns:1fr; }
  .sidebar{ position:sticky; top:0; z-index:40; flex-direction:row; align-items:center; padding:14px 20px; overflow-x:auto; }
  .sidebar nav{ flex-direction:row; }
  .sidebar .user-box{ display:none; }
  .main{ padding:24px 18px; }
  .stat-row{ grid-template-columns:repeat(2,1fr); }
  .navlinks{ display:none; }
}