/* =====================================================
   Basic AI Course LMS - Main Stylesheet
   Developer: Muhammad Ali | WhatsApp: +971569248419
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Nastaliq+Urdu:wght@400;700&display=swap');

/* ====== CSS Variables ====== */
:root {
  --primary: #7c3aed;
  --primary-dark: #5b21b6;
  --primary-light: #a855f7;
  --accent: #c084fc;
  --accent-neon: #d946ef;
  --bg-dark: #0a0a0f;
  --bg-card: #12121c;
  --bg-card2: #1a1a2e;
  --surface: #1e1e3a;
  --border: rgba(124, 58, 237, 0.3);
  --text-primary: #f0f0ff;
  --text-secondary: #a0a0c0;
  --text-muted: #6060a0;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --white: #ffffff;
  --shadow: 0 4px 24px rgba(124, 58, 237, 0.15);
  --shadow-lg: 0 8px 40px rgba(124, 58, 237, 0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ====== Base Styles ====== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

.urdu-text {
  font-family: 'Noto Nastaliq Urdu', serif;
  direction: rtl;
}

/* ====== Typography ====== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent);
}

/* ====== Buttons ====== */
.btn-primary-custom {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
}

.btn-primary-custom:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(124, 58, 237, 0.5);
  color: #fff;
}

.btn-outline-custom {
  background: transparent;
  color: var(--primary-light);
  border: 2px solid var(--primary);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-outline-custom:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-whatsapp {
  background: linear-gradient(135deg, #25d366, #128c7e);
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-whatsapp:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
  color: #fff;
}

.btn-sm-custom {
  padding: 7px 16px;
  font-size: 13px;
}

/* ====== Cards ====== */
.card-custom {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card-custom::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent-neon), var(--primary));
}

.card-custom:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.card-glass {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 24px;
}

/* ====== Badges ====== */
.badge {
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  text-transform: capitalize;
}

.badge-success  { background: rgba(16,185,129,0.15); color: var(--success); border: 1px solid rgba(16,185,129,0.3); }
.badge-danger   { background: rgba(239,68,68,0.15); color: var(--danger); border: 1px solid rgba(239,68,68,0.3); }
.badge-warning  { background: rgba(245,158,11,0.15); color: var(--warning); border: 1px solid rgba(245,158,11,0.3); }
.badge-info     { background: rgba(59,130,246,0.15); color: var(--info); border: 1px solid rgba(59,130,246,0.3); }
.badge-primary  { background: rgba(124,58,237,0.15); color: var(--primary-light); border: 1px solid rgba(124,58,237,0.3); }
.badge-secondary{ background: rgba(96,96,160,0.15); color: var(--text-secondary); border: 1px solid rgba(96,96,160,0.3); }

/* ====== Form Styles ====== */
.form-control-custom {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 12px 16px;
  font-size: 15px;
  font-family: 'Inter', sans-serif;
  transition: var(--transition);
  outline: none;
}

.form-control-custom:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
  background: var(--bg-card2);
}

.form-control-custom::placeholder {
  color: var(--text-muted);
}

.form-label-custom {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 14px;
  color: var(--text-secondary);
}

.form-group {
  margin-bottom: 20px;
}

/* ====== Progress Bar ====== */
.progress-custom {
  background: var(--surface);
  border-radius: 50px;
  height: 10px;
  overflow: hidden;
}

.progress-bar-custom {
  height: 100%;
  border-radius: 50px;
  background: linear-gradient(90deg, var(--primary), var(--accent-neon));
  transition: width 0.8s ease;
  position: relative;
}

.progress-bar-custom::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ====== Alert ====== */
.alert {
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  border: 1px solid;
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-success {
  background: rgba(16,185,129,0.1);
  border-color: rgba(16,185,129,0.3);
  color: #6ee7b7;
}

.alert-danger {
  background: rgba(239,68,68,0.1);
  border-color: rgba(239,68,68,0.3);
  color: #fca5a5;
}

.alert-info {
  background: rgba(59,130,246,0.1);
  border-color: rgba(59,130,246,0.3);
  color: #93c5fd;
}

.alert-warning {
  background: rgba(245,158,11,0.1);
  border-color: rgba(245,158,11,0.3);
  color: #fcd34d;
}

.alert-dismissible .btn-close {
  filter: invert(1);
  opacity: 0.6;
}

/* ====== Tables ====== */
.table-custom {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table-custom th {
  background: var(--surface);
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.8px;
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.table-custom td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(124, 58, 237, 0.1);
  color: var(--text-primary);
  vertical-align: middle;
}

.table-custom tr:last-child td {
  border-bottom: none;
}

.table-custom tr:hover td {
  background: rgba(124, 58, 237, 0.05);
}

.table-responsive-custom {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ====== Navigation - Admin Sidebar ====== */
.admin-sidebar {
  width: 260px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  overflow-y: auto;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.admin-sidebar::-webkit-scrollbar { width: 4px; }
.admin-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-logo {
  padding: 24px 20px;
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.sidebar-logo h4 {
  font-size: 16px;
  color: var(--primary-light);
  margin: 8px 0 4px;
}

.sidebar-logo p {
  font-size: 11px;
  color: var(--text-muted);
}

.sidebar-nav {
  padding: 16px 0;
  flex: 1;
}

.nav-section-title {
  padding: 8px 20px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  font-weight: 700;
}

.nav-link-custom {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 20px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.nav-link-custom:hover {
  background: rgba(124, 58, 237, 0.1);
  color: var(--primary-light);
  border-left-color: var(--primary);
}

.nav-link-custom.active {
  background: rgba(124, 58, 237, 0.15);
  color: var(--primary-light);
  border-left-color: var(--primary);
}

.nav-link-custom .nav-icon {
  width: 18px;
  text-align: center;
  opacity: 0.8;
}

/* ====== Admin Main Content ====== */
.admin-main {
  margin-left: 260px;
  min-height: 100vh;
  transition: var(--transition);
}

.admin-topbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.admin-content {
  padding: 24px;
}

/* ====== Stats Cards ====== */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.stat-icon.purple { background: rgba(124, 58, 237, 0.15); color: var(--primary-light); }
.stat-icon.green  { background: rgba(16,185,129,0.15); color: var(--success); }
.stat-icon.orange { background: rgba(245,158,11,0.15); color: var(--warning); }
.stat-icon.blue   { background: rgba(59,130,246,0.15); color: var(--info); }
.stat-icon.pink   { background: rgba(217,70,239,0.15); color: #e879f9; }

.stat-value {
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ====== Student Bottom Nav ====== */
.student-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  z-index: 1000;
  padding: 8px 0 env(safe-area-inset-bottom, 8px);
}

.bottom-nav-items {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 12px;
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
  border-radius: 8px;
}

.bottom-nav-item i {
  font-size: 20px;
}

.bottom-nav-item.active,
.bottom-nav-item:hover {
  color: var(--primary-light);
}

/* ====== Student Layout ====== */
.student-topbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.student-content {
  padding: 20px;
  max-width: 900px;
  margin: 0 auto;
  padding-bottom: 80px;
}

/* ====== Floating WhatsApp Button ====== */
.whatsapp-float {
  position: fixed;
  bottom: 90px;
  right: 20px;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #25d366, #128c7e);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  box-shadow: 0 4px 20px rgba(37,211,102,0.4);
  z-index: 999;
  transition: var(--transition);
  text-decoration: none;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  color: white;
  box-shadow: 0 6px 30px rgba(37,211,102,0.5);
}

/* ====== Lesson Card ====== */
.lesson-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  transition: var(--transition);
}

.lesson-card.completed {
  border-color: rgba(16,185,129,0.4);
  background: rgba(16,185,129,0.03);
}

.lesson-card.locked {
  opacity: 0.6;
}

.lesson-day-badge {
  display: inline-block;
  background: rgba(124, 58, 237, 0.15);
  color: var(--primary-light);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 8px;
}

.lesson-complete-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(16,185,129,0.15);
  color: var(--success);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
}

/* ====== Module Accordion ====== */
.module-header {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
  transition: var(--transition);
}

.module-header:hover {
  background: rgba(124, 58, 237, 0.1);
  border-color: var(--primary);
}

.module-header.active {
  background: rgba(124, 58, 237, 0.15);
  border-color: var(--primary);
}

.module-body {
  padding: 12px 4px;
}

/* ====== Login Page ====== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.login-bg-circles {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
}

.login-bg-circles::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124,58,237,0.15) 0%, transparent 70%);
  top: -200px;
  right: -100px;
  border-radius: 50%;
}

.login-bg-circles::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(217,70,239,0.1) 0%, transparent 70%);
  bottom: -150px;
  left: -100px;
  border-radius: 50%;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  position: relative;
  z-index: 1;
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent-neon), var(--primary));
  border-radius: 24px 24px 0 0;
}

/* ====== Grid ====== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ====== Developer Footer ====== */
.dev-footer {
  text-align: center;
  padding: 16px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.dev-footer a {
  color: var(--primary-light);
}

/* ====== Responsive Breakpoints ====== */
@media (max-width: 1024px) {
  .admin-sidebar {
    transform: translateX(-100%);
  }
  .admin-sidebar.open {
    transform: translateX(0);
  }
  .admin-main {
    margin-left: 0;
  }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .student-bottom-nav { display: block; }
  .student-content { padding: 16px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .login-card { padding: 28px 20px; }
  .admin-content { padding: 16px; }
  .admin-topbar { padding: 12px 16px; }
  .card-custom { padding: 18px; }
  .table-responsive-custom { border-radius: var(--radius-sm); }

  .whatsapp-float {
    bottom: 75px;
    right: 16px;
    width: 50px;
    height: 50px;
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  body { font-size: 14px; }
  .stat-value { font-size: 22px; }
  .btn-primary-custom, .btn-outline-custom { padding: 11px 20px; font-size: 14px; }
}

/* ====== Overlay for sidebar ====== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 999;
}

.sidebar-overlay.active {
  display: block;
}

/* ====== Hamburger ====== */
.hamburger-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  transition: var(--transition);
}

.hamburger-btn:hover {
  background: rgba(124,58,237,0.15);
  border-color: var(--primary);
}

/* ====== Page Title ====== */
.page-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ====== Empty State ====== */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.empty-state i {
  font-size: 48px;
  margin-bottom: 16px;
  display: block;
  opacity: 0.5;
}

/* ====== Scrollbar ====== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ====== Animations ====== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 10px rgba(124,58,237,0.3); }
  50% { box-shadow: 0 0 25px rgba(124,58,237,0.6); }
}

.animate-fade-up {
  animation: fadeInUp 0.5s ease forwards;
}

/* ====== Modal ====== */
.modal-dark .modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
}

.modal-dark .modal-header {
  border-bottom: 1px solid var(--border);
}

.modal-dark .modal-footer {
  border-top: 1px solid var(--border);
}

.modal-dark .btn-close {
  filter: invert(1);
}