/* ============================================================
   COURSENOVA — Premium Courses Stylesheet
   premium.css — used by premium-courses.html and premium-course-player.html
   ============================================================ */

/* Import from existing globals */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

/* ── CSS Variables ───────────────────────────────────────────── */
:root {
  --premium-bg:        #050a14;
  --premium-surface:   #0d1626;
  --premium-card:      rgba(255,255,255,0.04);
  --premium-border:    rgba(255,255,255,0.08);
  --premium-gold:      #f5c518;
  --premium-gold-dim:  rgba(245,197,24,0.15);
  --premium-purple:    #7c3aed;
  --premium-purple-dim:rgba(124,58,237,0.15);
  --premium-cyan:      #06b6d4;
  --premium-green:     #10b981;
  --premium-red:       #ef4444;
  --text-primary:      #f1f5f9;
  --text-secondary:    #94a3b8;
  --text-muted:        #64748b;
  --radius:            16px;
  --radius-sm:         10px;
  --shadow-glow:       0 0 40px rgba(124,58,237,0.18);
  --transition:        all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ── Reset & Base ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

/* ── Page Header / Hero ──────────────────────────────────────── */
.prem-hero {
  padding: 120px 24px 60px;
  text-align: center;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(124,58,237,0.3) 0%, transparent 70%);
  position: relative;
}

.prem-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%237c3aed' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.prem-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--premium-gold-dim);
  border: 1px solid rgba(245,197,24,0.3);
  padding: 6px 18px;
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--premium-gold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.prem-hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  background: linear-gradient(135deg, #fff 30%, var(--premium-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.prem-hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 32px;
}

.prem-hero-stats {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
}

.prem-stat {
  text-align: center;
}

.prem-stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--premium-gold);
}

.prem-stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Course Grid ─────────────────────────────────────────────── */
.prem-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.prem-section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.prem-section-title span {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--premium-gold);
  background: var(--premium-gold-dim);
  border: 1px solid rgba(245,197,24,0.25);
  padding: 3px 12px;
  border-radius: 99px;
}

.prem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

/* ── Course Card ─────────────────────────────────────────────── */
.prem-card {
  background: var(--premium-card);
  border: 1px solid var(--premium-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
  backdrop-filter: blur(12px);
}

.prem-card:hover {
  transform: translateY(-6px);
  border-color: rgba(124,58,237,0.4);
  box-shadow: var(--shadow-glow);
}

.prem-card-top {
  padding: 28px 28px 20px;
  position: relative;
}

/* Lock overlay for non-enrolled */
.prem-lock-overlay {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  background: rgba(124,58,237,0.25);
  border: 1px solid rgba(124,58,237,0.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  animation: pulselock 3s infinite;
}

@keyframes pulselock {
  0%,100% { box-shadow: 0 0 0 0 rgba(124,58,237,0.4); }
  50%      { box-shadow: 0 0 0 8px rgba(124,58,237,0); }
}

.prem-card-icon {
  font-size: 2.8rem;
  margin-bottom: 14px;
  display: block;
}

.prem-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: linear-gradient(135deg, var(--premium-gold) 0%, #e5a30a 100%);
  color: #000;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.prem-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.prem-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.prem-card-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.prem-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.prem-highlights {
  list-style: none;
  margin-bottom: 22px;
}

.prem-highlights li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  padding: 4px 0;
}

.prem-highlights li::before {
  content: '✓';
  color: var(--premium-green);
  font-weight: 700;
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* Progress bar on enrolled cards */
.prem-progress-bar {
  background: rgba(255,255,255,0.06);
  border-radius: 99px;
  height: 6px;
  margin-bottom: 10px;
  overflow: hidden;
}

.prem-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--premium-purple), var(--premium-cyan));
  border-radius: 99px;
  transition: width 0.6s ease;
}

.prem-progress-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

/* Card footer */
.prem-card-footer {
  padding: 20px 28px 24px;
  border-top: 1px solid var(--premium-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.prem-price {
  display: flex;
  flex-direction: column;
}

.prem-price-amount {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.prem-price-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn-buy {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--premium-purple), #5b21b6);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 99px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-buy:hover {
  background: linear-gradient(135deg, #8b5cf6, var(--premium-purple));
  transform: scale(1.04);
  box-shadow: 0 8px 24px rgba(124,58,237,0.4);
}

.btn-continue {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--premium-green), #059669);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 99px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-continue:hover {
  background: linear-gradient(135deg, #34d399, var(--premium-green));
  transform: scale(1.04);
  box-shadow: 0 8px 24px rgba(16,185,129,0.3);
}

/* ── Loading Skeleton ────────────────────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, rgba(255,255,255,0.04) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.04) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Toast Notification ──────────────────────────────────────── */
.prem-toast {
  position: fixed;
  top: 88px;
  right: 24px;
  z-index: 99999;
  background: rgba(13,22,38,0.95);
  border: 1px solid var(--premium-border);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  min-width: 280px;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  transform: translateX(120%);
  transition: transform 0.4s cubic-bezier(0.68,-0.55,0.27,1.55);
}

.prem-toast.active { transform: translateX(0); }
.prem-toast.toast-success { border-color: rgba(16,185,129,0.5); }
.prem-toast.toast-error   { border-color: rgba(239,68,68,0.5); }
.prem-toast-title { font-weight: 700; font-size: 0.9rem; margin-bottom: 3px; }
.prem-toast.toast-success .prem-toast-title { color: var(--premium-green); }
.prem-toast.toast-error   .prem-toast-title { color: var(--premium-red); }
.prem-toast-msg   { font-size: 0.82rem; color: var(--text-secondary); }

/* ── Confetti ────────────────────────────────────────────────── */
.confetti-piece {
  position: fixed;
  top: -10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 99998;
  animation: confettiFall 3s ease-in forwards;
}

@keyframes confettiFall {
  0%   { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ══════════════════════════════════════════════════════════════
   COURSE PLAYER STYLES
   ══════════════════════════════════════════════════════════════ */

.player-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: calc(100vh - 70px);
  margin-top: 70px;
}

/* Sidebar */
.player-sidebar {
  background: var(--premium-surface);
  border-right: 1px solid var(--premium-border);
  overflow-y: auto;
  position: sticky;
  top: 70px;
  height: calc(100vh - 70px);
}

.player-sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--premium-border);
}

.player-sidebar-header h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-overall-progress {
  background: rgba(255,255,255,0.05);
  border-radius: 99px;
  height: 5px;
  overflow: hidden;
  margin-bottom: 6px;
}

.player-overall-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--premium-purple), var(--premium-cyan));
  border-radius: 99px;
  transition: width 0.6s ease;
}

.player-overall-label {
  font-size: 0.74rem;
  color: var(--text-muted);
  text-align: right;
}

.lesson-list { list-style: none; padding: 10px 0; }

.lesson-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  cursor: pointer;
  transition: var(--transition);
  border-left: 3px solid transparent;
}

.lesson-item:hover { background: rgba(255,255,255,0.04); }
.lesson-item.active {
  background: var(--premium-purple-dim);
  border-left-color: var(--premium-purple);
}

.lesson-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--premium-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  flex-shrink: 0;
  transition: var(--transition);
}

.lesson-item.done .lesson-check {
  background: var(--premium-green);
  border-color: var(--premium-green);
  color: #fff;
}

.lesson-item.active .lesson-check {
  border-color: var(--premium-purple);
  color: var(--premium-purple);
}

.lesson-title {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.35;
}

.lesson-item.active .lesson-title { color: var(--text-primary); font-weight: 600; }
.lesson-item.done  .lesson-title  { color: var(--text-muted); }

/* Sidebar Exam button */
.sidebar-exam-btn {
  margin: 12px 16px 20px;
  width: calc(100% - 32px);
  padding: 11px;
  border-radius: var(--radius-sm);
  background: var(--premium-gold-dim);
  border: 1px solid rgba(245,197,24,0.3);
  color: var(--premium-gold);
  font-weight: 700;
  font-size: 0.84rem;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.sidebar-exam-btn:hover {
  background: rgba(245,197,24,0.25);
}

/* Main content */
.player-main {
  background: var(--premium-bg);
  overflow-y: auto;
}

/* Video area */
.player-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  max-height: 500px;
}

.player-video-wrap iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Content tabs */
.player-tabs {
  display: flex;
  border-bottom: 1px solid var(--premium-border);
  padding: 0 28px;
  gap: 4px;
  background: var(--premium-surface);
}

.player-tab {
  padding: 14px 20px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

.player-tab:hover { color: var(--text-secondary); }
.player-tab.active {
  color: var(--premium-purple);
  border-bottom-color: var(--premium-purple);
}

.player-tab-content { display: none; padding: 28px; }
.player-tab-content.active { display: block; }

/* PDF viewer */
.pdf-frame {
  width: 100%;
  height: 600px;
  border: 1px solid var(--premium-border);
  border-radius: var(--radius-sm);
  background: #fff;
}

/* Mark complete button */
.btn-mark-complete {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16,185,129,0.12);
  border: 1px solid rgba(16,185,129,0.3);
  color: var(--premium-green);
  font-size: 0.86rem;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: 99px;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 16px;
}

.btn-mark-complete:hover {
  background: rgba(16,185,129,0.2);
}

.btn-mark-complete.completed {
  background: var(--premium-green);
  color: #fff;
  border-color: var(--premium-green);
  cursor: default;
}

/* ── Exam Panel ──────────────────────────────────────────────── */
.exam-panel {
  max-width: 720px;
}

.exam-header {
  background: var(--premium-gold-dim);
  border: 1px solid rgba(245,197,24,0.25);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.exam-header h3 { font-size: 1.1rem; font-weight: 700; }
.exam-attempts-badge {
  background: rgba(245,197,24,0.2);
  border: 1px solid rgba(245,197,24,0.3);
  color: var(--premium-gold);
  padding: 5px 14px;
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 700;
}

.exam-question {
  background: var(--premium-card);
  border: 1px solid var(--premium-border);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  margin-bottom: 16px;
  transition: var(--transition);
}

.exam-question:hover { border-color: rgba(124,58,237,0.3); }

.exam-q-text {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 14px;
  line-height: 1.5;
}

.exam-q-num {
  font-size: 0.72rem;
  color: var(--premium-purple);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.exam-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.exam-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--premium-border);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: none;
}

.exam-option:hover {
  border-color: rgba(124,58,237,0.4);
  background: var(--premium-purple-dim);
  color: var(--text-primary);
}

.exam-option input[type="radio"] { accent-color: var(--premium-purple); }

.exam-option.selected {
  border-color: var(--premium-purple);
  background: var(--premium-purple-dim);
  color: var(--text-primary);
}

/* After grading */
.exam-option.correct {
  border-color: var(--premium-green);
  background: rgba(16,185,129,0.1);
  color: var(--premium-green);
}

.exam-option.wrong {
  border-color: var(--premium-red);
  background: rgba(239,68,68,0.1);
  color: var(--premium-red);
}

.btn-submit-exam {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--premium-gold), #e5a30a);
  color: #000;
  font-size: 0.9rem;
  font-weight: 800;
  padding: 14px 32px;
  border-radius: 99px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 8px;
}

.btn-submit-exam:hover:not(:disabled) {
  transform: scale(1.04);
  box-shadow: 0 10px 30px rgba(245,197,24,0.35);
}

.btn-submit-exam:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Exam result */
.exam-result {
  border-radius: var(--radius);
  padding: 28px;
  margin-top: 24px;
  text-align: center;
}

.exam-result.pass {
  background: rgba(16,185,129,0.08);
  border: 1px solid rgba(16,185,129,0.25);
}

.exam-result.fail {
  background: rgba(239,68,68,0.07);
  border: 1px solid rgba(239,68,68,0.22);
}

.exam-result-icon { font-size: 3rem; margin-bottom: 12px; }
.exam-result h3 { font-size: 1.3rem; font-weight: 800; margin-bottom: 8px; }
.exam-result.pass h3 { color: var(--premium-green); }
.exam-result.fail h3 { color: var(--premium-red); }
.exam-result p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 6px; }

/* Certificate section */
.cert-section {
  background: linear-gradient(135deg, rgba(245,197,24,0.08), rgba(124,58,237,0.08));
  border: 1px solid rgba(245,197,24,0.25);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  margin-top: 28px;
}

.cert-section h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--premium-gold);
}

.cert-section p { color: var(--text-secondary); font-size: 0.88rem; margin-bottom: 20px; }

.btn-download-cert {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--premium-gold), #e5a30a);
  color: #000;
  font-size: 0.9rem;
  font-weight: 800;
  padding: 14px 28px;
  border-radius: 99px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-download-cert:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 32px rgba(245,197,24,0.35);
}

/* ── Locked Access Screen ────────────────────────────────────── */
.locked-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 80vh;
  text-align: center;
  padding: 32px;
}

.locked-icon {
  font-size: 4rem;
  margin-bottom: 20px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}

.locked-screen h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 12px; }
.locked-screen p  { color: var(--text-secondary); margin-bottom: 28px; max-width: 400px; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .player-layout {
    grid-template-columns: 1fr;
  }

  .player-sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--premium-border);
  }

  .prem-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .prem-hero { padding: 100px 16px 48px; }
  .prem-card-footer { flex-direction: column; align-items: flex-start; }
  .player-tabs { padding: 0 16px; }
  .player-tab-content { padding: 20px 16px; }
  .exam-header { flex-direction: column; }
}