.admin-main {
  padding: 2rem 0 4rem;
  min-height: calc(100vh - 70px);
}

.admin-header {
  text-align: center;
  margin-bottom: 3rem;
}

.admin-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.admin-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.admin-content {
  display: grid;
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.admin-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid var(--border);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.card-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.admin-form {
  display: grid;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 0.875rem 1rem;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
}

.form-group select option {
  background: var(--bg-primary);
  color: var(--text-primary);
  padding: 0.5rem;
}

.form-group select option:checked,
.form-group select option:hover {
  background: var(--primary);
  color: white;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group small {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.courses-list {
  display: grid;
  gap: 1rem;
}

.course-item {
  background: var(--bg-secondary);
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1rem;
}

.course-item-info h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.course-item-info p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.course-item-meta {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.course-item-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  padding: 0.5rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.btn-icon.delete {
  color: #ef4444;
}

.btn-icon.delete:hover {
  background: #ef4444;
  border-color: #ef4444;
  color: white;
}

.file-item {
  background: var(--input-bg);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
}

.file-item-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.file-icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
}

.file-name {
  color: var(--text-primary);
  font-size: 0.9rem;
}

.file-size {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.files-section {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.files-section h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.alert {
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #22c55e;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.login-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.login-box {
  background: var(--card-bg);
  padding: 3rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  max-width: 400px;
  width: 90%;
  text-align: center;
}

.login-box h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.file-upload-wrapper {
  position: relative;
}

.file-upload-wrapper input[type="file"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.file-upload-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--input-bg);
  border: 2px dashed var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-secondary);
  font-weight: 500;
}

.file-upload-label:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
  color: var(--primary);
}

.file-upload-label svg {
  transition: transform 0.3s ease;
}

.file-upload-label:hover svg {
  transform: translateY(-3px);
}

.file-upload-label.has-file {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
  border-style: solid;
}

@media (max-width: 768px) {
  .admin-header h1 {
    font-size: 2rem;
  }

  .admin-card {
    padding: 1.5rem;
  }

  .course-item {
    flex-direction: column;
  }

  .course-item-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .login-box {
    padding: 2rem;
  }
}


/* ===== Select: remove native arrow completely ===== */
.form-group select{
  -webkit-appearance: none !important;
  -moz-appearance: none !important;
  appearance: none !important;
  background-image: none !important;   /* remove old custom arrow */
  padding-right: 3.25rem !important;   /* space for our arrow */
  position: relative;
}

/* ===== Custom arrow (single) ===== */
.form-group{
  position: relative;
}

.form-group select{
  background-color: var(--surface) !important;
}

.form-group select::ms-expand{
  display: none; /* old Edge/IE */
}

.form-group.has-select{
  position: relative;
}

.form-group.has-select::after{
  content: "";
  position: absolute;
  top: calc(50% + 14px);
  right: 1.25rem;
  width: 0;
  height: 0;
  pointer-events: none;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 9px solid var(--text-secondary);
  transform: translateY(-50%);
  opacity: 0.9;
}


/* =========================
   Mobile layout like screenshot
   ========================= */

/* زر الهمبرجر */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 10px;
  padding: 0.5rem;
  cursor: pointer;
}

/* تفعيل مظهر موبايل */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  /* Navbar */
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu {
    display: none;            /* نخفيها افتراضيًا */
    position: absolute;
    top: 70px;
    right: 1rem;
    left: 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 0.75rem;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 999;
  }

  .nav-menu.open {
    display: flex;            /* تظهر لما نضغط همبرجر */
  }

  .nav-link {
    padding: 0.75rem 0.75rem;
    border-radius: 10px;
  }

  .nav-link.active::after {
    display: none;            /* خط active تحت الرابط مو حلو للموبايل */
  }

  .nav-link.active {
    background: rgba(102, 126, 234, 0.12);
    color: var(--primary);
  }

  /* Hero */
  .hero-section {
    padding: 2.25rem 0 1.5rem;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  /* Search bar مثل الصورة: input + زر */
  .search-box {
    flex-direction: row;
    border-radius: 0.9rem;
  }

  .search-input {
    padding: 0.9rem 1rem;
    font-size: 0.95rem;
  }

  .search-btn {
    padding: 0.9rem 1rem;
    font-size: 0.9rem;
    white-space: nowrap;
  }

  /* Courses grid = عمود واحد */
  .courses-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  /* الكرت أنحف */
  .course-card {
    padding: 1.25rem;
    border-radius: 1.25rem;
  }

  /* عنوان المادة بالوسط زي الصورة */
  .course-header {
    flex-direction: column;
    text-align: center;
    gap: 0.6rem;
    margin-bottom: 1rem;
  }

  /* اخفِ الأيقونة الكبيرة (لو تبغى شكل زي الصورة تمامًا) */
  .course-icon {
    display: none;
  }

  .course-code {
    font-size: 1.3rem;
  }

  .course-name {
    font-size: 0.95rem;
  }

  /* stats وسط */
  .course-stats {
    justify-content: center;
    margin-bottom: 1rem;
  }

  /* الأزرار جنب بعض (مو تحت بعض) */
  .course-actions {
    flex-direction: row !important;
    gap: 0.75rem;
  }

  .btn,
  .course-actions .browse-btn,
  .course-actions .download-btn {
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
    border-radius: 0.9rem;
  }
}

/* موبايل صغير جدًا */
@media (max-width: 420px) {
  .search-btn span {
    display: none; /* لو الزر طويل عندك */
  }

  .course-code {
    font-size: 1.2rem;
  }

  .btn,
  .course-actions .browse-btn,
  .course-actions .download-btn {
    font-size: 0.9rem;
    padding: 0.8rem 0.9rem;
  }
}