/* Creating YouTube Content for the AI, SI, and Agentic Era - Stylesheet */
:root {
  --bg-primary: #0a0d18;
  --bg-secondary: #12172b;
  --bg-tertiary: #1c2442;
  --bg-card: #161e38;
  --bg-input: #0c1122;
  --border-color: #273456;
  --border-focus: #f59e0b;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-red: #ef4444;
  --accent-amber: #f59e0b;
  --accent-gold: #fbbf24;
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-violet: #8b5cf6;
  --accent-green: #10b981;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --sidebar-width: 280px;
  --coach-width: 320px;
  --header-height: 64px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* App Header */
.app-header {
  height: var(--header-height);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 1.5rem;
  max-width: 1600px;
  margin: 0 auto;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-badge {
  background: linear-gradient(135deg, var(--accent-red), var(--accent-indigo));
  color: #fff;
  font-weight: 800;
  font-size: 0.8rem;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  letter-spacing: 0.05em;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.title-group h1 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.title-group p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.progress-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.progress-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress-bar-bg {
  width: 140px;
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-amber), var(--accent-cyan));
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-text {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-gold);
  min-width: 38px;
}

/* Main Layout */
.main-layout {
  display: flex;
  max-width: 1600px;
  margin: 0 auto;
  min-height: calc(100vh - var(--header-height));
}

/* Steps Sidebar */
.steps-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem 1rem;
  flex-shrink: 0;
  overflow-y: auto;
  max-height: calc(100vh - var(--header-height));
  position: sticky;
  top: var(--header-height);
}

.sidebar-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-left: 0.5rem;
}

.step-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.step-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.step-nav-item:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.step-nav-item.active {
  background-color: rgba(239, 68, 68, 0.12);
  color: var(--accent-red);
  border-color: rgba(239, 68, 68, 0.3);
  font-weight: 600;
}

.step-nav-item.completed .step-nav-badge {
  background-color: var(--accent-green);
  color: #fff;
}

.step-nav-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-nav-item.active .step-nav-badge {
  background-color: var(--accent-red);
  color: #fff;
}

/* Center Content Area */
.content-area {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
  max-width: 980px;
}

/* OS Selector Card */
.os-selector-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.os-selector-info h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.os-selector-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.os-btn-group {
  display: flex;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 3px;
  gap: 3px;
}

.os-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.os-btn:hover {
  color: var(--text-primary);
}

.os-btn.active {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* Step Card */
.step-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 2rem;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  display: none;
}

.step-card.active {
  display: block;
}

.step-card-header {
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.step-header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.step-number-tag {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  border: 1px solid rgba(239, 68, 68, 0.3);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
}

.step-card-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.step-est-time {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.step-card-body {
  padding: 1.75rem;
}

.step-intro {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

/* Alert Boxes */
.alert-box {
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  border-left: 4px solid;
}

.alert-box.info {
  background-color: rgba(99, 102, 241, 0.08);
  border-color: var(--accent-indigo);
}

.alert-box.warning {
  background-color: rgba(245, 158, 11, 0.08);
  border-color: var(--accent-amber);
}

.alert-box.danger {
  background-color: rgba(239, 68, 68, 0.08);
  border-color: var(--accent-red);
}

.alert-box.success {
  background-color: rgba(16, 185, 129, 0.08);
  border-color: var(--accent-green);
}

.alert-title {
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.alert-box.info .alert-title { color: var(--accent-indigo); }
.alert-box.warning .alert-title { color: var(--accent-amber); }
.alert-box.danger .alert-title { color: var(--accent-red); }
.alert-box.success .alert-title { color: var(--accent-green); }

.alert-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Tables */
.styled-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.85rem;
}

.styled-table th {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  text-align: left;
  padding: 0.75rem 1rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

.styled-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.styled-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Terminal Cards */
.terminal-card {
  background-color: #0d1117;
  border: 1px solid #30363d;
  border-radius: 8px;
  overflow: hidden;
  margin: 1.25rem 0;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

.terminal-header {
  background-color: #161b22;
  padding: 0.5rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #30363d;
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #30363d;
}

.terminal-shell-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.copy-btn {
  background-color: #21262d;
  border: 1px solid #30363d;
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-btn:hover {
  background-color: #30363d;
  color: #fff;
}

.terminal-body {
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e6edf3;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Checkpoint Card */
.checkpoint-card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--accent-amber);
  border-radius: 8px;
  padding: 1.25rem;
  margin-top: 1.75rem;
}

.checkpoint-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.checkpoint-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.checkpoint-badge {
  font-size: 0.75rem;
  background-color: rgba(245, 158, 11, 0.2);
  color: var(--accent-gold);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
}

.checkpoint-badge.verified {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--accent-green);
}

.checkpoint-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.checkpoint-form {
  display: flex;
  gap: 0.75rem;
}

.checkpoint-input {
  flex: 1;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.6rem 0.75rem;
  border-radius: 6px;
  outline: none;
}

.checkpoint-input:focus {
  border-color: var(--border-focus);
}

.checkpoint-btn {
  background: linear-gradient(135deg, var(--accent-red), var(--accent-indigo));
  border: none;
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.6rem 1.25rem;
  border-radius: 6px;
  cursor: pointer;
  transition: opacity 0.2s;
  white-space: nowrap;
}

.checkpoint-btn:hover {
  opacity: 0.9;
}

.checkpoint-feedback {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  display: none;
}

.checkpoint-feedback.success {
  display: block;
  color: var(--accent-green);
}

.checkpoint-feedback.error {
  display: block;
  color: var(--accent-red);
}

/* Card Footer Navigation */
.step-card-footer {
  padding: 1.25rem 1.75rem;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-btn {
  padding: 0.65rem 1.25rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

.btn-prev {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.btn-prev:hover:not(:disabled) {
  background-color: var(--border-color);
  color: var(--text-primary);
}

.btn-next {
  background: linear-gradient(135deg, var(--accent-red), var(--accent-amber));
  color: #fff;
  border: none;
}

.btn-next:hover:not(:disabled) {
  opacity: 0.9;
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Coach Sidebar */
.coach-sidebar {
  width: var(--coach-width);
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  padding: 1.5rem 1rem;
  flex-shrink: 0;
  max-height: calc(100vh - var(--header-height));
  position: sticky;
  top: var(--header-height);
  display: flex;
  flex-direction: column;
}

.coach-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.coach-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.coach-avatar {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-red), var(--accent-indigo));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.coach-title-group h3 {
  font-size: 0.95rem;
  font-weight: 700;
}

.coach-status-badge {
  font-size: 0.7rem;
  color: var(--accent-green);
  display: block;
}

.quick-questions-box {
  margin-bottom: 1rem;
}

.quick-questions-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.quick-questions-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.faq-chip {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.78rem;
  padding: 0.45rem 0.65rem;
  border-radius: 6px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  line-height: 1.3;
}

.faq-chip:hover {
  border-color: var(--accent-red);
  color: var(--text-primary);
  background-color: rgba(239, 68, 68, 0.08);
}

.coach-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-right: 0.25rem;
  max-height: 350px;
}

.chat-bubble {
  padding: 0.75rem 0.9rem;
  border-radius: 8px;
  font-size: 0.82rem;
  line-height: 1.45;
}

.chat-bubble.bot {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border-left: 3px solid var(--accent-red);
  align-self: flex-start;
}

.chat-bubble.user {
  background-color: rgba(99, 102, 241, 0.2);
  color: var(--text-primary);
  border-right: 3px solid var(--accent-indigo);
  align-self: flex-end;
}

.coach-input-group {
  display: flex;
  gap: 0.5rem;
  margin-top: auto;
}

.coach-input {
  flex: 1;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.82rem;
  padding: 0.5rem 0.65rem;
  border-radius: 6px;
  outline: none;
}

.coach-input:focus {
  border-color: var(--border-focus);
}

.coach-send-btn {
  background-color: var(--accent-red);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

/* Deep Dive Accordion */
.deep-dive {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin: 1.25rem 0;
  overflow: hidden;
}

.deep-dive-summary {
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.02);
  user-select: none;
}

.deep-dive-content {
  padding: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 1200px) {
  .coach-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .steps-sidebar {
    display: none;
  }
  .content-area {
    padding: 1rem;
  }
  .header-inner {
    padding: 0 1rem;
  }
  .title-group p {
    display: none;
  }
}


/* Checkpoint Green Checkmark on Menu Items (Right-aligned) */
.nav-item a,
.step-nav-item,
.step-nav-btn,
.nav-item-btn,
.nav-link {
  display: flex !important;
  align-items: center !important;
  justify-content: flex-start !important;
  position: relative !important;
}

.nav-item.completed a::after,
.step-nav-item.completed::after,
.step-nav-btn.completed::after,
.nav-item-btn.completed::after,
.nav-link.completed::after {
  content: " \2713" !important;
  margin-left: auto !important;
  color: #22c55e !important;
  font-weight: 800 !important;
  font-size: 1.15rem !important;
  line-height: 1 !important;
  display: inline-flex !important;
  align-items: center !important;
}