/* =====================================================================
   PHP: Basics to Advance – e-Learning web panel
   Layout: fixed left sidebar + content (same structure as the Solidity panel)
   Theme colours:  #8892BE (periwinkle) · #4F5B93 (indigo) · #99CC99 (green)
   ===================================================================== */
:root {
  --indigo: #4F5B93;
  --peri: #8892BE;
  --green: #99CC99;
  --indigo-dark: #3d4774;      /* darker shade of #4F5B93 for hover / text */
  --green-dark: #2f6b2f;       /* readable text on light green backgrounds */
  --green-hover: #86bf86;
  --peri-tint: #eef0f8;        /* light tint of #8892BE */
  --peri-tint2: #f6f7fb;
  --green-tint: #eef7ee;
  --text: #272b3b;
  --muted: #646a82;
  --border: #dfe2ee;
}

body {
  font-family: "Open Sans", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--peri-tint2);
  font-size: 15.5px;
}
a { color: var(--indigo); text-decoration: none; }
a:hover { color: var(--indigo-dark); text-decoration: underline; }
h1, h2, h3, h4, h5, h6 { font-family: "Poppins", sans-serif; }

/* ---------------- Back to top ---------------- */
.back-to-top {
  position: fixed; visibility: hidden; opacity: 0; right: 15px; bottom: 15px; z-index: 996;
  background: var(--indigo); width: 42px; height: 42px; border-radius: 50px; transition: all .4s;
}
.back-to-top i { font-size: 28px; color: #fff; line-height: 0; }
.back-to-top:hover { background: var(--peri); text-decoration: none; }
.back-to-top.active { visibility: visible; opacity: 1; }

/* ---------------- Sidebar header ---------------- */
#header {
  position: fixed; top: 0; left: 0; bottom: 0; width: 300px; z-index: 9997;
  transition: all .5s; padding: 0 15px;
  background: var(--indigo);
  background-image: linear-gradient(180deg, rgba(255,255,255,.06), rgba(0,0,0,0) 40%);
  overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--peri) transparent;
}
#header::-webkit-scrollbar { width: 6px; }
#header::-webkit-scrollbar-thumb { background: var(--peri); border-radius: 3px; }

#header .profile { text-align: center; padding: 18px 0 6px; }
#header .profile img {
  width: 104px; height: 104px; margin: 0 auto; display: block; border-radius: 50%;
  border: 6px solid var(--peri); background: #fff; padding: 4px;
}
#header .profile h1 { font-size: 30px; margin: 12px 0 0; padding: 0; font-weight: 700; letter-spacing: 1px; }
#header .profile h1 a, #header .profile h1 a:hover { color: #fff; text-decoration: none; }
#header .profile .profile-sub { color: var(--green); font-family: "Poppins", sans-serif; font-weight: 500; font-size: 15px; letter-spacing: .5px; }
#header .profile .profile-tags { color: #fff; font-weight: 700; font-size: 13.5px; margin-top: 6px; }

/* ---------------- Navigation ---------------- */
.nav-menu { padding: 18px 0 30px; }
.nav-menu * { margin: 0; padding: 0; list-style: none; }
.nav-menu > ul > li { position: relative; white-space: nowrap; }
.nav-menu a, .nav-menu a:focus {
  display: flex; align-items: center; color: #e4e7f4; padding: 9px 12px; margin-bottom: 4px;
  transition: .3s; font-size: 14.5px; border-radius: 6px; border-left: 3px solid transparent;
  white-space: normal; line-height: 1.35;
}
.nav-menu a i, .nav-menu a:focus i { font-size: 22px; padding-right: 9px; color: var(--peri); flex: 0 0 auto; }
.nav-menu a:hover, .nav-menu .active, .nav-menu .active:focus, .nav-menu li:hover > a, .nav-menu a.selected {
  text-decoration: none; color: #fff; background: rgba(255,255,255,.10);
}
.nav-menu a:hover i, .nav-menu li:hover > a i, .nav-menu a.selected i { color: var(--green); }
.nav-menu a.selected { border-left-color: var(--green); background: rgba(255,255,255,.16); font-weight: 600; }
.nav-menu a b { font-weight: 600; }
.nav-menu .headersection {
  margin: 16px 0 6px; padding: 0 12px; font-family: "Poppins", sans-serif; font-size: 12px; font-weight: 600;
  letter-spacing: 1.5px; text-transform: uppercase; color: var(--green); border-bottom: 1px solid rgba(255,255,255,.18); padding-bottom: 5px;
}

/* ---------------- Mobile toggle ---------------- */
.mobile-nav-toggle {
  position: fixed; right: 15px; top: 15px; z-index: 9998; border: 0; font-size: 26px; line-height: 0;
  transition: all .4s; outline: none; cursor: pointer; background: var(--indigo); color: #fff;
  padding: 7px; border-radius: 50px; width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
}
.mobile-nav-active { overflow: hidden; }
.mobile-nav-active #header { left: 0; }

@media (min-width: 1200px) {
  #main, #footer { margin-left: 300px; }
}
@media (max-width: 1199px) {
  #header { left: -300px; }
}

/* ---------------- Main ---------------- */
#main { min-height: 70vh; }

.breadcrumbs { padding: 22px 0; background: var(--peri-tint); border-bottom: 3px solid var(--peri); }
.breadcrumbs h2 { font-size: 24px; font-weight: 600; color: var(--indigo); margin: 0; padding-right: 16px; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; font-size: 14.5px; }
.breadcrumbs ol li + li { padding-left: 10px; }
.breadcrumbs ol li + li::before { display: inline-block; padding-right: 10px; color: var(--peri); content: "/"; }
.breadcrumbs ol a { color: var(--indigo); font-weight: 600; }
@media (max-width: 991px) {
  .breadcrumbs .d-flex { display: block !important; }
  .breadcrumbs h2 { font-size: 20px; margin-bottom: 8px; }
  .breadcrumbs ol { display: block; }
  .breadcrumbs ol li { display: inline-block; }
}
@media (max-width: 1199px) {
  .breadcrumbs h2 { padding-right: 56px; }
}

.inner-page { padding: 24px 0 30px; }
.container.gap { margin-bottom: 0; }
.card {
  border: 1px solid var(--border); border-radius: 10px; margin-bottom: 22px;
  box-shadow: 0 2px 10px rgba(79, 91, 147, .07); background: #fff;
}
.card-body { padding: 22px 26px; }
@media (max-width: 575px) { .card-body { padding: 16px 14px; } }
.card-title {
  font-family: "Poppins", sans-serif; font-weight: 600; color: var(--indigo); font-size: 20px;
  padding-bottom: 8px; margin-bottom: 16px; position: relative;
}
.card-title::after { content: ""; position: absolute; left: 0; bottom: 0; width: 54px; height: 3px; border-radius: 2px; background: var(--green); }
h1.card-title { font-size: 34px; font-weight: 700; }
.card-title small { font-size: 14px; font-weight: 400; }
.card.notes > .card-body + .card-body { border-top: 1px dashed var(--border); }

/* ---------------- Buttons (theme) ---------------- */
.btn { font-family: "Poppins", sans-serif; border-radius: 6px; margin: 3px 2px; }
.btn-success { background: var(--green); border-color: var(--green); color: #1d331d; }
.btn-success:hover, .btn-success:focus, .btn-success:active { background: var(--green-hover) !important; border-color: var(--green-hover) !important; color: #102010 !important; }
.btn-outline-success { border-color: var(--green); color: var(--indigo); background: #fff; border-width: 2px; }
.btn-outline-success:hover, .btn-outline-success:active { background: var(--green) !important; border-color: var(--green) !important; color: #102010 !important; }
.btn-primary { background: var(--indigo); border-color: var(--indigo); color: #fff; }
.btn-primary:hover, .btn-primary:focus, .btn-primary:active { background: var(--indigo-dark) !important; border-color: var(--indigo-dark) !important; color: #fff !important; }
.btn-outline-primary { border: 2px solid var(--indigo); color: var(--indigo); background: #fff; }
.btn-outline-primary:hover, .btn-outline-primary:active { background: var(--indigo) !important; color: #fff !important; border-color: var(--indigo) !important; }
.btn-info { background: var(--peri); border-color: var(--peri); color: #161a33; }
.btn-info:hover, .btn-info:focus { background: #7782b3 !important; border-color: #7782b3 !important; color: #0e1126 !important; }
.btn:hover { text-decoration: none; }

/* ---------------- Footer ---------------- */
#footer { padding: 18px 0 22px; font-size: 13.5px; color: var(--muted); border-top: 3px solid var(--peri); background: #fff; text-align: center; }
#footer .copyright { color: var(--text); }
#footer .copyright strong span { color: var(--indigo); }
#footer .credits { font-size: 12px; margin-top: 4px; }
#footer .visitors { margin-bottom: 6px; }

/* ---------------- Tables (theme) ---------------- */
.table { --bs-table-striped-bg: var(--peri-tint2); }
.table > thead th, .table tr:first-child > th { background-color: var(--indigo) !important; box-shadow: none !important; color: #fff !important; font-family: "Poppins", sans-serif; font-weight: 500; border-color: var(--indigo); }
.table tr:first-child > th code { background: rgba(255,255,255,.18); color: #fff; }
.table td, .table th { vertical-align: top; }
.table-bordered > :not(caption) > * > * { border-color: var(--border); }

/* ---------------- Accordion (theme) ---------------- */
.accordion-button:not(.collapsed) { background: var(--peri-tint); color: var(--indigo); box-shadow: inset 0 -1px 0 var(--border); }
.accordion-button:focus { box-shadow: 0 0 0 .2rem rgba(136,146,190,.35); border-color: var(--peri); }
.nav-pills .nav-link { color: var(--indigo); border: 1px solid var(--border); margin: 0 6px 8px 0; font-family: "Poppins", sans-serif; font-size: 14px; }
.nav-pills .nav-link.active { background: var(--indigo); border-color: var(--indigo); color: #fff; }
.nav-pills .nav-link:hover { text-decoration: none; border-color: var(--peri); }
.form-control:focus { border-color: var(--peri); box-shadow: 0 0 0 .2rem rgba(136,146,190,.3); }