/* YS LMS Frontend Premium UI */
body { font-family: 'Inter', sans-serif; }
#yslms-exam-app, #yslms-course-app, .yslms-leaderboard { font-family: 'Inter', sans-serif; color: #1f2937; }

/* Container Styling */
#yslms-exam-container {
    border: none; 
    padding: 30px; 
    border-radius: 16px; 
    background: #fff; 
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.01);
}

/* Timer & Header */
.yslms-timer {
    font-size: 22px; font-weight: 700; color: #ef4444; 
    float: right; background: #fef2f2; padding: 8px 16px; 
    border-radius: 8px; border: 1px solid #fecaca;
}
.yslms-sec-timer {
    font-size: 16px; font-weight: 600; color: #f59e0b; 
    float: right; margin-right: 15px; background: #fffbeb; 
    padding: 8px 16px; border-radius: 8px; border: 1px solid #fde68a;
}

.yslms-q-text { font-size: 20px; margin-bottom: 25px; line-height: 1.6; font-weight: 500; }

/* Options */
.yslms-opt {
    padding: 15px; border: 2px solid #e5e7eb; margin-bottom: 12px; 
    border-radius: 10px; background: #fff; cursor: pointer; 
    transition: 0.2s; display: flex; align-items: center;
}
.yslms-opt:hover { border-color: #3b82f6; background: #f0f7ff; }
.yslms-opt input { margin-right: 12px; transform: scale(1.2); cursor: pointer; }

/* Action Buttons */
.yslms-actions { margin-top: 30px; display: flex; justify-content: flex-end; gap: 10px; }
.yslms-actions .button { border-radius: 8px !important; padding: 10px 24px !important; font-weight: 600 !important; }
#yslms-mark-btn { background: #fff !important; border: 1px solid #f59e0b !important; color: #f59e0b !important; }
#yslms-next-btn, #yslms-submit-btn { background: #2563eb !important; border: none !important; color: #fff !important; }

/* Question Palette (Testbook Style) */
#yslms-navigator {
    margin-top: 30px; padding: 20px; background: #f9fafb; 
    border-radius: 12px; border: 1px solid #e5e7eb;
}
.yslms-palette-btn {
    width: 40px; height: 40px; margin: 5px; border: none; 
    color: #fff; font-weight: 700; cursor: pointer; border-radius: 50% !important;
    transition: 0.2s; box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.yslms-palette-btn:hover { transform: scale(1.1); }
.yslms-palette-btn.not-visited { background: #fff; color: #6b7280; border: 1px solid #d1d5db; }
.yslms-palette-btn.not-answered { background: #ef4444; }
.yslms-palette-btn.answered { background: #10b981; }
.yslms-palette-btn.marked { background: #f59e0b; }
.yslms-palette-btn.answered-marked { background: #10b981; position: relative; }
.yslms-palette-btn.answered-marked::after { content: '★'; color: #f59e0b; position: absolute; top: -5px; right: -5px; font-size: 14px; background: #fff; border-radius: 50%; padding: 0 2px; }

.yslms-legend { margin-top: 20px; font-size: 13px; color: #4b5563; border-top: 1px solid #e5e7eb; padding-top: 15px; }
.yslms-legend span { margin-right: 15px; display: inline-flex; align-items: center; gap: 6px; }
.yslms-legend div { display: inline-block; width: 16px; height: 16px; border-radius: 50%; }

/* Course UI */
#yslms-course-app { background: #fff; padding: 30px; border-radius: 16px; box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05); }
#yslms-lesson-list { list-style: none; padding: 0; margin: 0; }
#yslms-lesson-list li {
    background: #fff; margin-bottom: 10px; padding: 15px; 
    border-radius: 10px; border: 1px solid #e5e7eb; transition: 0.2s;
}
#yslms-lesson-list li:hover { border-left: 4px solid #2563eb; padding-left: 18px; }
.yslms-load-lesson { background: none !important; border: none !important; padding: 0 !important; text-align: left; cursor: pointer; font-weight: 500; color: #1f2937; }
.yslms-load-lesson:disabled { color: #9ca3af !important; cursor: not-allowed !important; }

#yslms-progress-bar { width: 100%; background: #e5e7eb; height: 8px; border-radius: 4px; overflow: hidden; }
#yslms-progress-fill { background: #2563eb; height: 100%; transition: width 0.5s ease; border-radius: 4px; }

/* Pricing UI */
.yslms-pricing-box { background: #f0f9ff; padding: 20px; border-radius: 12px; border: 1px solid #bae6fd; margin-bottom: 20px; }
.yslms-price-mode { padding: 10px; border-radius: 8px; border: 1px solid #bae6fd; margin-right: 10px; font-weight: 500; }
.yslms-buy-now { background: #0ea5e9 !important; border: none !important; color: #fff !important; padding: 10px 20px !important; border-radius: 8px !important; font-weight: 600 !important; cursor: pointer; }

/* Analytics UI */
.yslms-analytics-filters { margin-bottom: 25px; background: #f9fafb; padding: 15px; border-radius: 10px; display: flex; gap: 8px; }
.yslms-filter-btn { background: #fff !important; border: 1px solid #d1d5db !important; color: #374151 !important; border-radius: 8px !important; padding: 8px 16px !important; font-weight: 500 !important; }
.yslms-filter-btn.active { background: #2563eb !important; color: #fff !important; border-color: #2563eb !important; }

.yslms-analytics-card { border: 1px solid #e5e7eb; padding: 20px; margin-bottom: 15px; border-radius: 12px; background: #fff; box-shadow: 0 2px 4px rgba(0,0,0,0.02); }
.yslms-analytics-card.correct { border-left: 5px solid #10b981; }
.yslms-analytics-card.incorrect { border-left: 5px solid #ef4444; }
.yslms-analytics-card.skipped { border-left: 5px solid #9ca3af; }
.yslms-analytics-card.flagged { border-right: 5px solid #f59e0b; }

.yslms-card-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #f3f4f6; padding-bottom: 10px; margin-bottom: 15px; }
.yslms-time-badge { background: #f3f4f6; padding: 4px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; color: #4b5563; }
.yslms-flag-badge { color: #f59e0b; font-weight: 700; font-size: 14px; }

.yslms-ans-block { margin-top: 8px; padding: 12px; background: #f9fafb; border-radius: 8px; font-size: 14px; }
.yslms-explanation { margin-top: 12px; padding: 15px; background: #ecfdf5; border: 1px dashed #10b981; border-radius: 8px; font-size: 14px; color: #065f46; }

/* Leaderboard & Dashboard */
.yslms-leaderboard { background: #fff; padding: 30px; border-radius: 16px; box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05); }
.yslms-leaderboard h3 { text-align: center; font-size: 24px; margin-bottom: 20px; }
.yslms-leaderboard table { border-radius: 12px; overflow: hidden; }
.yslms-leaderboard th { background: #f9fafb !important; font-weight: 700; color: #374151; }
.yslms-leaderboard tr:hover { background: #f0f7ff !important; }

/* Module 13: Premium Student Dashboard UI */
.yslms-locked { max-width: 600px; margin: 50px auto; text-align: center; background: #fff; padding: 40px; border-radius: 16px; box-shadow: 0 10px 25px-5px rgba(0,0,0,0.05); }
.yslms-student-dashboard { max-width: 1000px; margin: 30px auto; font-family: 'Inter', sans-serif; }

.yslms-dash-header { background: linear-gradient(135deg, #1e293b 0%, #334155 100%); color: #fff; padding: 30px; border-radius: 16px; margin-bottom: 30px; box-shadow: 0 10px 15px-3px rgba(0,0,0,0.1); }
.yslms-dash-header h2 { color: #fff !important; margin: 0 0 5px 0 !important; font-size: 28px; }
.yslms-dash-header p { margin: 0; opacity: 0.8; font-size: 15px; }

.yslms-dash-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 30px; }
.yslms-dash-stat-card { padding: 20px; border-radius: 12px; text-align: center; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); }
.yslms-dash-stat-card h3 { font-size: 32px !important; margin: 0 0 5px 0 !important; font-weight: 700 !important; }
.yslms-dash-stat-card p { margin: 0; font-size: 14px; font-weight: 500; color: #4b5563; }
.yslms-dash-stat-card.blue { background: #eff6ff; border: 1px solid #bfdbfe; } .yslms-dash-stat-card.blue h3 { color: #2563eb !important; }
.yslms-dash-stat-card.green { background: #ecfdf5; border: 1px solid #a7f3d0; } .yslms-dash-stat-card.green h3 { color: #059669 !important; }
.yslms-dash-stat-card.yellow { background: #fffbeb; border: 1px solid #fde68a; } .yslms-dash-stat-card.yellow h3 { color: #d97706 !important; }

.yslms-dash-section { background: #fff; padding: 25px; border-radius: 16px; margin-bottom: 30px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); border: 1px solid #f3f4f6; }
.yslms-dash-section h3 { margin-top: 0 !important; margin-bottom: 20px !important; font-size: 20px; color: #1f2937; border-bottom: 2px solid #f3f4f6; padding-bottom: 10px; }
.yslms-empty { color: #6b7280; font-style: italic; text-align: center; padding: 20px; background: #f9fafb; border-radius: 8px; }

.yslms-badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 15px; }
.yslms-badge-card { display: flex; align-items: center; background: #f9fafb; padding: 15px; border-radius: 12px; border: 1px solid #e5e7eb; }
.yslms-badge-icon { width: 50px; height: 50px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 24px; margin-right: 15px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); }
.yslms-badge-info { display: flex; flex-direction: column; flex-grow: 1; }
.yslms-badge-info strong { font-size: 16px; color: #1f2937; } .yslms-badge-info span { font-size: 13px; color: #6b7280; }
.yslms-share-btn { background: #1da1f2; color: #fff; text-decoration: none; padding: 6px 12px; border-radius: 6px; font-size: 12px; font-weight: 600; }

.yslms-course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.yslms-dash-course-card { background: #f9fafb; padding: 20px; border-radius: 12px; border: 1px solid #e5e7eb; }
.yslms-dash-course-card strong { display: block; margin-bottom: 15px; color: #1f2937; }
.yslms-progress-mini { width: 100%; height: 8px; background: #e5e7eb; border-radius: 4px; margin-bottom: 8px; overflow: hidden; }
.yslms-progress-mini-fill { height: 100%; background: #10b981; border-radius: 4px; transition: width 0.5s; }
.yslms-dash-course-card span { font-size: 13px; color: #6b7280; }

.yslms-dash-table { width: 100%; border-collapse: collapse; }
.yslms-dash-table th { text-align: left; padding: 12px; background: #f9fafb; color: #374151; font-weight: 600; border-bottom: 2px solid #e5e7eb; }
.yslms-dash-table td { padding: 12px; border-bottom: 1px solid #f3f4f6; color: #4b5563; }
.yslms-status-tag { padding: 4px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.yslms-status-tag.completed { background: #d1fae5; color: #059669; }
.yslms-status-tag.flagged { background: #fee2e2; color: #dc2626; }

/* Responsive Table */
@media (max-width: 768px) {
    .yslms-dash-stats { grid-template-columns: 1fr; }
    .yslms-dash-table thead { display: none; }
    .yslms-dash-table tr { display: block; margin-bottom: 15px; border: 1px solid #e5e7eb; border-radius: 8px; }
    .yslms-dash-table td { display: flex; justify-content: space-between; border: none; padding: 10px; }
    .yslms-dash-table td::before { content: attr(data-label); font-weight: 600; color: #1f2937; margin-right: 10px; }
}

/* TTS Button Styling */
.yslms-tts-btn {
    background: #f3f4f6; color: #4b5563; border: 1px solid #d1d5db;
    padding: 6px 12px; border-radius: 8px; cursor: pointer;
    font-weight: 600; font-size: 13px; margin-bottom: 15px;
    transition: 0.2s;
}
.yslms-tts-btn:hover { background: #e5e7eb; color: #1f2937; }

/* Module 14: Listings & Certificates UI */
.yslms-listing-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 25px; max-width: 1000px; margin: 30px auto; }
.yslms-listing-card { background: #fff; padding: 25px; border-radius: 16px; border: 1px solid #e5e7eb; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); text-align: center; transition: 0.2s; }
.yslms-listing-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); border-color: #3b82f6; }
.yslms-listing-icon { font-size: 40px; margin-bottom: 15px; }
.yslms-listing-card h3 { margin: 0 0 10px 0 !important; color: #1f2937; font-size: 20px; }
.yslms-listing-meta { color: #6b7280; font-size: 14px; margin-bottom: 20px !important; }

.yslms-cert-list { display: flex; flex-direction: column; gap: 15px; }
.yslms-cert-card { background: #f0f9ff; border: 1px solid #bae6fd; border-radius: 12px; padding: 20px; display: flex; justify-content: space-between; align-items: center; }
.yslms-cert-card strong { color: #0c4a6e; font-size: 16px; }
.yslms-cert-card span { color: #0369a1; font-size: 13px; }