/* ==========================================================================
   Skill Library - 30-Day Python Zero to Hero SaaS Learning Platform CSS
   ========================================================================== */

:root {
  --py-bg: #07090e;
  --py-surface: #0d121f;
  --py-card: #131b2e;
  --py-card-hover: #1c2742;
  --py-border: rgba(255, 255, 255, 0.08);
  --py-border-active: rgba(16, 185, 129, 0.4);
  
  --py-emerald: #10b981;
  --py-emerald-glow: rgba(16, 185, 129, 0.2);
  --py-gold: #f59e0b;
  --py-blue: #38bdf8;
  --py-red: #ef4444;
  --py-purple: #a855f7;
  
  --py-text-main: #f8fafc;
  --py-text-muted: #94a3b8;
  --py-text-dim: #64748b;
  
  --py-code-bg: #090d16;
  --py-font-code: 'Fira Code', 'Cascadia Code', Consolas, Monaco, monospace;
  --py-font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --py-font-heading: 'Outfit', 'Inter', sans-serif;
  
  --sidebar-width: 320px;
  --header-height: 68px;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body.py-app-body {
  background-color: var(--py-bg);
  color: var(--py-text-main);
  font-family: var(--py-font-sans);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* ---------------- Top SaaS Header ---------------- */
.py-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(13, 18, 31, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--py-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.py-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--py-text-main);
}

.py-brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #38bdf8 0%, #10b981 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 19px;
  color: #fff;
  box-shadow: 0 4px 16px var(--py-emerald-glow);
}

.py-brand-text h1,
.py-brand-title {
  display: block;
  font-family: var(--py-font-heading);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  line-height: 1.2;
}

.py-brand-text span {
  font-size: 11px;
  color: var(--py-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 600;
}

.py-topbar-center {
  display: flex;
  align-items: center;
  gap: 20px;
}

.py-progress-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--py-card);
  padding: 6px 14px;
  border-radius: 40px;
  border: 1px solid var(--py-border);
}

.py-progress-text {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--py-text-muted);
}

.py-progress-text strong {
  color: var(--py-emerald);
}

.py-bar-container {
  width: 120px;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.py-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #10b981, #38bdf8);
  border-radius: 10px;
  transition: width 0.4s ease;
}

.py-streak-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--py-gold);
  padding: 6px 12px;
  border-radius: 40px;
  font-size: 13px;
  font-weight: 700;
}

.py-topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.py-btn-nav {
  background: var(--py-card);
  color: var(--py-text-main);
  border: 1px solid var(--py-border);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: var(--transition);
}

.py-btn-nav:hover {
  background: var(--py-card-hover);
  border-color: var(--py-border-active);
}

.py-btn-cert {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  border: none;
  box-shadow: 0 4px 14px var(--py-emerald-glow);
}

.py-btn-cert:hover {
  background: linear-gradient(135deg, #059669, #047857);
}

.py-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--py-text-main);
  font-size: 24px;
  cursor: pointer;
  padding: 4px;
}

/* ---------------- Main App Workspace ---------------- */
.py-app-layout {
  display: flex;
  flex: 1;
  position: relative;
  min-height: calc(100vh - var(--header-height));
}

/* ---------------- Left Sidebar (Days Directory) ---------------- */
.py-sidebar {
  width: var(--sidebar-width);
  background: var(--py-surface);
  border-right: 1px solid var(--py-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  overflow-y: auto;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.py-sidebar-header {
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--py-border);
}

.py-search-box {
  position: relative;
  width: 100%;
}

.py-search-box input {
  width: 100%;
  background: var(--py-card);
  border: 1px solid var(--py-border);
  padding: 9px 12px 9px 34px;
  border-radius: var(--radius-md);
  color: var(--py-text-main);
  font-size: 13px;
  outline: none;
  transition: var(--transition);
}

.py-search-box input:focus {
  border-color: var(--py-emerald);
  box-shadow: 0 0 0 2px var(--py-emerald-glow);
}

.py-search-icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--py-text-dim);
  font-size: 14px;
}

.py-sidebar-content {
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.py-week-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.py-week-title {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--py-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.9px;
  padding: 0 10px 4px;
  display: flex;
  justify-content: space-between;
}

.py-day-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--py-text-muted);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.py-day-item:hover {
  background: var(--py-card);
  color: var(--py-text-main);
}

.py-day-item.active {
  background: var(--py-card-hover);
  color: #fff;
  border-color: var(--py-emerald);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.12);
}

.py-day-left {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.py-day-num {
  font-size: 11.5px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--py-text-muted);
  flex-shrink: 0;
}

.py-day-item.active .py-day-num {
  background: var(--py-emerald);
  color: #07090e;
}

.py-day-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.py-day-status {
  font-size: 14px;
  flex-shrink: 0;
}

.py-status-done {
  color: var(--py-emerald);
}

.py-status-locked {
  color: var(--py-text-dim);
}

/* ---------------- Main Stage / Lesson View ---------------- */
.py-main-content {
  flex: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 36px 40px 120px;
  width: 100%;
}

.py-lesson-card {
  background: var(--py-surface);
  border: 1px solid var(--py-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.py-lesson-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.py-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.py-badge-day {
  background: rgba(56, 189, 248, 0.15);
  color: var(--py-blue);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.py-badge-time {
  background: rgba(255, 255, 255, 0.06);
  color: var(--py-text-muted);
}

.py-badge-free {
  background: rgba(16, 185, 129, 0.15);
  color: var(--py-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.py-lesson-title {
  font-family: var(--py-font-heading);
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
  line-height: 1.25;
}

.py-lesson-subtitle {
  font-size: 16px;
  color: var(--py-text-muted);
  margin-bottom: 24px;
}

/* Lesson Body Typography & Markdown styling */
.py-article-body {
  font-size: 15.5px;
  color: #cbd5e1;
  line-height: 1.75;
}

.py-article-body h2 {
  font-family: var(--py-font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--py-text-main);
  margin: 32px 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.py-article-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: #e2e8f0;
  margin: 22px 0 10px;
}

.py-article-body p {
  margin-bottom: 16px;
}

.py-article-body ul, .py-article-body ol {
  margin: 0 0 18px 22px;
}

.py-article-body li {
  margin-bottom: 8px;
}

.py-article-body strong {
  color: #fff;
}

/* Callout Alert Boxes */
.py-callout {
  background: rgba(16, 185, 129, 0.08);
  border-left: 4px solid var(--py-emerald);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
}

.py-callout-warning {
  background: rgba(245, 158, 11, 0.08);
  border-left-color: var(--py-gold);
}

.py-callout-title {
  font-weight: 700;
  font-size: 14.5px;
  color: var(--py-text-main);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Code Snippet Box */
.py-code-block {
  background: var(--py-code-bg);
  border: 1px solid var(--py-border);
  border-radius: var(--radius-md);
  margin: 20px 0;
  overflow: hidden;
}

.py-code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--py-border);
  font-size: 12px;
  color: var(--py-text-dim);
  font-family: var(--py-font-code);
}

.py-copy-btn {
  background: transparent;
  border: 1px solid var(--py-border);
  color: var(--py-text-muted);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11px;
  cursor: pointer;
  transition: var(--transition);
}

.py-copy-btn:hover {
  background: var(--py-card);
  color: var(--py-text-main);
  border-color: var(--py-emerald);
}

.py-code-content {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--py-font-code);
  font-size: 13.5px;
  line-height: 1.6;
  color: #38bdf8;
}

.py-code-content pre {
  margin: 0;
}

.py-terminal-output {
  background: #020408;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  padding: 12px 16px;
  font-family: var(--py-font-code);
  font-size: 12.5px;
  color: #a7f3d0;
}

.py-terminal-label {
  color: var(--py-text-dim);
  font-size: 11px;
  margin-bottom: 4px;
  text-transform: uppercase;
}

/* ---------------- Interactive Quiz Engine (5-7 MCQs) ---------------- */
.py-quiz-section {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid var(--py-border);
}

.py-quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.py-quiz-heading {
  font-family: var(--py-font-heading);
  font-size: 24px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.py-quiz-badge {
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: var(--py-purple);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12.5px;
  font-weight: 700;
}

.py-quiz-score-meter {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 14px;
  color: var(--py-gold);
}

.py-mcq-card {
  background: var(--py-card);
  border: 1px solid var(--py-border);
  border-radius: var(--radius-md);
  padding: 22px;
  margin-bottom: 20px;
  transition: var(--transition);
}

.py-mcq-question {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--py-text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.py-mcq-qnum {
  color: var(--py-emerald);
  font-weight: 800;
  flex-shrink: 0;
}

.py-mcq-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.py-option-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--py-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  color: #cbd5e1;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}

.py-option-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.py-option-key {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

/* Correct & Wrong states */
.py-option-btn.correct {
  background: rgba(16, 185, 129, 0.15) !important;
  border-color: var(--py-emerald) !important;
  color: #10b981 !important;
  font-weight: 600;
}

.py-option-btn.correct .py-option-key {
  background: var(--py-emerald);
  color: #07090e;
}

.py-option-btn.wrong {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: var(--py-red) !important;
  color: #ef4444 !important;
}

.py-option-btn.wrong .py-option-key {
  background: var(--py-red);
  color: #fff;
}

.py-option-btn:disabled {
  cursor: default;
}

.py-mcq-explanation {
  display: none;
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  font-size: 13.5px;
  color: var(--py-text-muted);
  border-left: 3px solid var(--py-blue);
  line-height: 1.5;
}

.py-mcq-explanation.show {
  display: block;
}

/* ---------------- Bottom Action Bar ---------------- */
.py-action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--py-border);
  gap: 16px;
  flex-wrap: wrap;
}

.py-btn-action {
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--py-border);
  background: var(--py-card);
  color: var(--py-text-main);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.py-btn-action:hover:not(:disabled) {
  background: var(--py-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

.py-btn-action:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.py-btn-complete {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #fff;
  border: none;
  box-shadow: 0 4px 18px var(--py-emerald-glow);
}

.py-btn-complete:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  transform: translateY(-1px);
}

/* ---------------- Certificate & Completion Modal ---------------- */
.py-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(10px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.py-modal-backdrop.active {
  display: flex;
}

.py-modal-box {
  background: var(--py-surface);
  border: 1px solid var(--py-border);
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  padding: 36px;
  text-align: center;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
}

.py-modal-close {
  position: absolute;
  top: 16px;
  right: 18px;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--py-text-dim);
  cursor: pointer;
}

.py-cert-card {
  border: 2px solid var(--py-gold);
  border-radius: var(--radius-md);
  padding: 24px;
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.05) 0%, rgba(13, 18, 31, 0.8) 100%);
  margin: 20px 0;
  text-align: center;
}

.py-cert-title {
  font-family: var(--py-font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--py-gold);
  margin-bottom: 8px;
}

/* ================================================================
   RESPONSIVE & MOBILE-FRIENDLY DESIGN SYSTEM
   ================================================================ */

/* ---- Mobile-only progress strip ---- */
.py-mobile-progress {
  display: none;
  background: var(--py-card);
  border: 1px solid var(--py-border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  margin-bottom: 16px;
}

.py-mobile-progress-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--py-text-muted);
}

@media (max-width: 900px) {
  .py-mobile-progress {
    display: block;
  }
}

/* ---- Sidebar Overlay (dims main content when sidebar is open) ---- */
.py-sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 85;
}

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

/* ---- Tablet: <= 1100px ---- */
@media (max-width: 1100px) {
  :root {
    --sidebar-width: 280px;
  }

  .py-main-content {
    padding: 28px 24px 100px;
  }

  .py-lesson-card {
    padding: 28px 22px;
  }

  .py-topbar-actions .py-btn-nav span:last-child {
    display: none;
  }
}

/* ---- Mobile landscape & small tablets: <= 900px ---- */
@media (max-width: 900px) {
  :root {
    --header-height: 56px;
    --sidebar-width: 300px;
  }

  /* Sidebar → Off-canvas drawer */
  .py-sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    z-index: 90;
    width: var(--sidebar-width);
    transform: translateX(-100%);
    box-shadow: 10px 0 40px rgba(0, 0, 0, 0.7);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .py-sidebar.open {
    transform: translateX(0);
  }

  .py-menu-toggle {
    display: block;
  }

  /* Topbar */
  .py-topbar {
    padding: 0 14px;
    gap: 8px;
  }

  .py-topbar-center {
    display: none;
  }

  .py-topbar-actions {
    gap: 8px;
  }

  .py-topbar-actions .py-btn-nav {
    padding: 6px 10px;
    font-size: 12px;
  }

  .py-btn-cert span {
    font-size: 12px;
  }

  /* Brand */
  .py-brand-icon {
    width: 32px;
    height: 32px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  .py-brand-text h1,
  .py-brand-title {
    font-size: 14px;
  }

  .py-brand-text span {
    font-size: 10px;
  }

  /* Main content */
  .py-main-content {
    padding: 20px 14px 80px;
    max-width: 100%;
  }

  .py-lesson-card {
    padding: 22px 16px;
    border-radius: var(--radius-md);
  }

  .py-lesson-title {
    font-size: 22px;
    letter-spacing: -0.3px;
  }

  .py-lesson-subtitle {
    font-size: 14px;
  }

  /* Article body */
  .py-article-body {
    font-size: 14.5px;
  }

  .py-article-body h2 {
    font-size: 19px;
    margin: 24px 0 10px;
  }

  .py-article-body h3 {
    font-size: 16px;
  }

  /* Code blocks */
  .py-code-content {
    font-size: 12.5px;
    padding: 12px;
  }

  .py-terminal-output {
    font-size: 11.5px;
    padding: 10px 12px;
  }

  .py-code-header {
    padding: 6px 12px;
  }

  /* MCQ cards */
  .py-mcq-card {
    padding: 16px 14px;
    margin-bottom: 14px;
  }

  .py-mcq-question {
    font-size: 14px;
  }

  .py-option-btn {
    padding: 10px 12px;
    font-size: 13px;
    gap: 10px;
  }

  .py-option-key {
    width: 22px;
    height: 22px;
    font-size: 11px;
  }

  .py-mcq-explanation {
    font-size: 12.5px;
    padding: 10px 12px;
  }

  /* Quiz section */
  .py-quiz-heading {
    font-size: 20px;
  }

  .py-quiz-badge {
    font-size: 11px;
    padding: 3px 9px;
  }

  /* Action bar */
  .py-action-bar {
    flex-direction: column;
    gap: 10px;
  }

  .py-btn-action {
    width: 100%;
    justify-content: center;
    padding: 12px 16px;
    font-size: 13px;
  }

  /* Callout boxes */
  .py-callout {
    padding: 14px 16px;
  }

  /* Lesson meta badges */
  .py-lesson-meta {
    gap: 6px;
  }

  .py-badge {
    font-size: 10.5px;
    padding: 2px 8px;
  }

  /* Certificate modal */
  .py-modal-box {
    padding: 24px 18px;
    margin: 12px;
    max-height: 90vh;
    overflow-y: auto;
  }

  .py-cert-card {
    padding: 18px 14px;
  }
}

/* ---- Small phones: <= 480px ---- */
@media (max-width: 480px) {
  :root {
    --header-height: 50px;
    --sidebar-width: 85vw;
  }

  /* Topbar */
  .py-topbar {
    padding: 0 10px;
  }

  .py-brand {
    gap: 8px;
  }

  .py-brand-icon {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .py-brand-text h1,
  .py-brand-title {
    font-size: 13px;
  }

  .py-brand-text span {
    display: none;
  }

  .py-topbar-actions {
    gap: 4px;
  }

  .py-topbar-actions .py-btn-nav {
    padding: 5px 8px;
    font-size: 11px;
    border-radius: 4px;
  }

  /* Main content */
  .py-main-content {
    padding: 14px 10px 70px;
  }

  .py-lesson-card {
    padding: 16px 12px;
    border-radius: 10px;
  }

  .py-lesson-title {
    font-size: 18px;
    line-height: 1.3;
  }

  .py-lesson-subtitle {
    font-size: 13px;
    margin-bottom: 16px;
  }

  .py-article-body {
    font-size: 13.5px;
    line-height: 1.7;
  }

  .py-article-body h2 {
    font-size: 17px;
    margin: 20px 0 8px;
  }

  .py-article-body h3 {
    font-size: 15px;
    margin: 16px 0 8px;
  }

  .py-article-body ul, .py-article-body ol {
    margin-left: 16px;
  }

  .py-article-body li {
    margin-bottom: 6px;
    font-size: 13px;
  }

  /* Code blocks — full width, horizontal scroll */
  .py-code-block {
    border-radius: 8px;
    margin: 14px -2px;
  }

  .py-code-content {
    font-size: 11.5px;
    padding: 10px;
    -webkit-overflow-scrolling: touch;
  }

  .py-code-content pre {
    white-space: pre;
    word-break: normal;
    overflow-x: auto;
  }

  .py-terminal-output {
    font-size: 11px;
    padding: 8px 10px;
  }

  .py-code-header {
    padding: 5px 10px;
    font-size: 11px;
  }

  .py-copy-btn {
    font-size: 10px;
    padding: 3px 7px;
  }

  /* Callouts */
  .py-callout {
    padding: 12px 14px;
    margin: 16px 0;
    font-size: 13px;
  }

  .py-callout-title {
    font-size: 13px;
  }

  /* MCQs */
  .py-quiz-section {
    margin-top: 32px;
    padding-top: 24px;
  }

  .py-quiz-header {
    margin-bottom: 16px;
  }

  .py-quiz-heading {
    font-size: 17px;
    gap: 6px;
  }

  .py-mcq-card {
    padding: 14px 12px;
    margin-bottom: 12px;
    border-radius: 8px;
  }

  .py-mcq-question {
    font-size: 13px;
    gap: 6px;
    margin-bottom: 12px;
  }

  .py-mcq-qnum {
    font-size: 12px;
  }

  .py-mcq-options {
    gap: 8px;
  }

  .py-option-btn {
    padding: 10px;
    font-size: 12.5px;
    gap: 8px;
    border-radius: 8px;
  }

  .py-option-key {
    width: 20px;
    height: 20px;
    font-size: 10px;
  }

  .py-mcq-explanation {
    font-size: 12px;
    padding: 8px 10px;
    margin-top: 10px;
  }

  /* Action bar */
  .py-action-bar {
    margin-top: 24px;
    padding-top: 16px;
  }

  .py-btn-action {
    font-size: 12.5px;
    padding: 10px 14px;
    border-radius: 8px;
  }

  /* Lesson meta */
  .py-lesson-meta {
    gap: 4px;
    margin-bottom: 10px;
  }

  .py-badge {
    font-size: 9.5px;
    padding: 2px 6px;
    letter-spacing: 0.3px;
  }

  /* Reel grid pills */
  #pyReelGrid .py-badge {
    font-size: 9px;
    padding: 3px 6px;
  }

  /* Sidebar */
  .py-sidebar-header {
    padding: 12px 14px 10px;
  }

  .py-search-box input {
    font-size: 12px;
    padding: 8px 10px 8px 30px;
  }

  .py-sidebar-content {
    padding: 12px 8px;
  }

  .py-day-item {
    font-size: 12.5px;
    padding: 8px 10px;
  }

  .py-day-num {
    font-size: 10.5px;
    padding: 2px 5px;
  }

  .py-week-title {
    font-size: 10.5px;
    padding: 0 8px 4px;
  }

  /* Certificate modal */
  .py-modal-box {
    padding: 20px 14px;
    border-radius: 12px;
  }

  .py-cert-title {
    font-size: 17px;
  }

  .py-cert-card {
    padding: 14px 10px;
  }

  #pyCertStudentName {
    font-size: 20px !important;
  }
}

/* ---- Landscape phones ---- */
@media (max-height: 500px) and (orientation: landscape) {
  :root {
    --header-height: 44px;
  }

  .py-topbar {
    padding: 0 12px;
  }

  .py-brand-icon {
    width: 26px;
    height: 26px;
    font-size: 13px;
  }

  .py-main-content {
    padding: 12px 16px 60px;
  }

  .py-lesson-card {
    padding: 16px;
  }

  .py-sidebar {
    width: 260px;
  }

  .py-modal-box {
    max-height: 95vh;
  }
}

/* ---- Print styles for certificate ---- */
@media print {
  body.py-app-body {
    background: #fff !important;
    color: #000 !important;
  }

  .py-topbar,
  .py-sidebar,
  .py-sidebar-overlay,
  .py-quiz-section,
  .py-action-bar,
  .py-modal-close,
  .py-btn-action {
    display: none !important;
  }

  .py-modal-backdrop.active {
    position: static;
    background: none;
    backdrop-filter: none;
  }

  .py-modal-box {
    box-shadow: none;
    border: none;
    max-width: 100%;
    padding: 0;
  }

  .py-cert-card {
    border: 3px solid #c7a300;
    color: #000;
  }

  #pyCertStudentName {
    color: #b8860b !important;
  }
}

/* ---- Safe area (notch phones) ---- */
@supports (padding: env(safe-area-inset-bottom)) {
  .py-action-bar {
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
  }

  .py-topbar {
    padding-left: max(14px, env(safe-area-inset-left));
    padding-right: max(14px, env(safe-area-inset-right));
  }
}

/* ---- Touch-friendly improvements ---- */
@media (hover: none) and (pointer: coarse) {
  .py-option-btn {
    min-height: 44px;
  }

  .py-day-item {
    min-height: 44px;
  }

  .py-btn-action {
    min-height: 44px;
  }

  .py-copy-btn {
    min-height: 32px;
    min-width: 48px;
  }

  .py-btn-nav {
    min-height: 36px;
  }
}