/* ==========================================================================
   AI Learning — Applied AI Architecture & Systems Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ==========================================================================
   Design Tokens & Themes
   ========================================================================== */

:root,
[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: #131c2e;
  --bg-card-hover: #18243c;
  --bg-card-inner: #0d1422;
  
  --text-main: #f8fafc;
  --text-body: #e2e8f0;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.18);
  --primary-glow: rgba(99, 102, 241, 0.35);
  
  --accent-cyan: #38bdf8;
  --accent-cyan-light: rgba(56, 189, 248, 0.15);
  --accent-purple: #c084fc;
  --accent-purple-light: rgba(192, 132, 252, 0.15);
  --accent-emerald: #34d399;
  --accent-emerald-light: rgba(52, 211, 153, 0.15);
  --accent-amber: #fbbf24;
  --accent-rose: #fb7185;
  
  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(99, 102, 241, 0.5);
  --border-focus: rgba(99, 102, 241, 0.6);
  
  --hero-bg: linear-gradient(135deg, rgba(99, 102, 241, 0.18) 0%, rgba(56, 189, 248, 0.10) 50%, rgba(192, 132, 252, 0.14) 100%);
  --hero-border: rgba(99, 102, 241, 0.35);
  --hero-pill-bg: rgba(99, 102, 241, 0.2);
  --hero-pill-text: #a5b4fc;
  --hero-pill-border: rgba(99, 102, 241, 0.4);
  
  --navbar-bg: rgba(9, 13, 22, 0.88);
  --navbar-text: #f8fafc;
  
  --code-bg: #060913;
  --code-border: rgba(255, 255, 255, 0.12);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-card-inner: #f8fafc;
  
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: rgba(79, 70, 229, 0.1);
  --primary-glow: rgba(79, 70, 229, 0.2);
  
  --accent-cyan: #0284c7;
  --accent-cyan-light: rgba(2, 132, 199, 0.1);
  --accent-purple: #7c3aed;
  --accent-purple-light: rgba(124, 58, 237, 0.1);
  --accent-emerald: #059669;
  --accent-emerald-light: rgba(5, 150, 105, 0.1);
  --accent-amber: #d97706;
  --accent-rose: #e11d48;
  
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: rgba(79, 70, 229, 0.5);
  
  --hero-bg: linear-gradient(135deg, #eef2ff 0%, #f0fdfa 50%, #faf5ff 100%);
  --hero-border: #c7d2fe;
  --hero-pill-bg: #e0e7ff;
  --hero-pill-text: #4338ca;
  --hero-pill-border: #c7d2fe;
  
  --navbar-bg: rgba(255, 255, 255, 0.92);
  --navbar-text: #0f172a;
  
  --code-bg: #0f172a;
  --code-border: #cbd5e1;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 6px 20px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 36px -4px rgba(15, 23, 42, 0.12);
}

/* ==========================================================================
   Global Base & Typography
   ========================================================================== */

* {
  box-sizing: border-box;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-body);
  margin-bottom: 1rem;
}

/* Specific text helpers */
.text-theme-main {
  color: var(--text-main) !important;
}

.text-theme-body {
  color: var(--text-body) !important;
}

.text-theme-muted {
  color: var(--text-muted) !important;
}

/* Bootstrap Text Utilities Strict Overrides */
.text-muted {
  color: var(--text-muted) !important;
}

.lead {
  color: var(--text-body) !important;
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.65;
}

.text-gradient {
  background: linear-gradient(135deg, #818cf8 0%, #38bdf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

[data-theme="light"] .text-gradient {
  background: linear-gradient(135deg, #4f46e5 0%, #0284c7 50%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

code, pre, .font-mono {
  font-family: var(--font-mono);
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */

.portal-navbar {
  background: var(--navbar-bg) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
  z-index: 1000;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main) !important;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-accent {
  font-size: 1.35rem;
}

.logo-sub {
  color: var(--accent-cyan);
}

.nav-link {
  color: var(--text-muted) !important;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 8px 14px !important;
  border-radius: 10px;
  transition: all 0.18s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main) !important;
  background: var(--primary-light);
}

.portal-user-link {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main) !important;
  border-radius: 20px !important;
  padding: 6px 14px !important;
  font-weight: 600;
}

/* Dropdown Menus */
.dropdown-menu {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  padding: 8px;
  min-width: 210px;
}

.dropdown-item {
  color: var(--text-main);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

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

.dropdown-divider {
  border-color: var(--border-color);
  margin: 6px 0;
}

/* ==========================================================================
   Theme Switcher Button
   ========================================================================== */

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 10px;
  padding: 6px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* ==========================================================================
   Cards & Surfaces
   ========================================================================== */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  box-shadow: var(--shadow-sm);
  color: var(--text-body);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.card-header {
  background: transparent;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  font-weight: 700;
  padding: 16px 20px;
}

.card-footer {
  background: transparent;
  border-top: 1px solid var(--border-color);
  padding: 16px 20px;
}

.card-title {
  color: var(--text-main);
  font-weight: 700;
}

.card-inner {
  background: var(--bg-card-inner);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  font-weight: 600;
  border-radius: 10px;
  padding: 9px 20px;
  transition: all 0.2s ease;
  font-size: 0.94rem;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff !important;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-outline-primary {
  color: var(--primary) !important;
  border-color: var(--primary);
  background: transparent;
}

.btn-outline-primary:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff !important;
  transform: translateY(-1px);
}

.btn-outline-secondary {
  color: var(--text-main) !important;
  border-color: var(--border-color);
  background: var(--bg-card);
}

.btn-outline-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-main) !important;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
  border-radius: 8px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 1.05rem;
  border-radius: 12px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.portal-hero {
  background: var(--hero-bg);
  border: 1px solid var(--hero-border);
  border-radius: 24px;
  padding: 40px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.hero-pill {
  background: var(--hero-pill-bg);
  border: 1px solid var(--hero-pill-border);
  color: var(--hero-pill-text);
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  margin-bottom: 1rem;
}

/* ==========================================================================
   Forms, Inputs & Modals
   ========================================================================== */

.form-control, .form-select {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
}

.form-control:focus, .form-select:focus {
  background-color: var(--bg-secondary);
  border-color: var(--primary);
  color: var(--text-main);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-control::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.form-label {
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.modal-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-body);
  box-shadow: var(--shadow-lg);
}

.modal-header {
  border-bottom: 1px solid var(--border-color);
  padding: 20px 24px;
}

.modal-title {
  color: var(--text-main);
  font-weight: 700;
}

.modal-footer {
  border-top: 1px solid var(--border-color);
  padding: 16px 24px;
}

.btn-close {
  filter: invert(1) grayscale(100%) brightness(200%);
}

[data-theme="light"] .btn-close {
  filter: none;
}

/* Tables */
.table {
  color: var(--text-body);
  border-color: var(--border-color);
}

.table th {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
  padding: 12px 14px;
}

.table td {
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
  padding: 12px 14px;
}

.table-hover tbody tr:hover {
  background-color: var(--primary-light);
}

/* ==========================================================================
   Badges
   ========================================================================== */

.badge-tag {
  background: var(--bg-card-inner);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
}

.badge-primary-soft {
  background: var(--primary-light);
  border: 1px solid var(--border-hover);
  color: var(--primary);
  font-weight: 700;
}

/* ==========================================================================
   Markdown Content & Code Blocks
   ========================================================================== */

.readme-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-body);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.rendered-markdown {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-body);
}

.rendered-markdown h1, 
.rendered-markdown h2, 
.rendered-markdown h3,
.rendered-markdown h4 {
  color: var(--text-main);
  margin-top: 1.75rem;
  margin-bottom: 1rem;
}

.rendered-markdown pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 20px;
  border-radius: 14px;
  overflow-x: auto;
  color: #f8fafc;
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
}

.rendered-markdown code {
  color: var(--accent-cyan);
  background: var(--accent-cyan-light);
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 0.9em;
  font-weight: 500;
}

.rendered-markdown pre code {
  background: transparent;
  padding: 0;
  color: #f8fafc;
  font-size: 0.92rem;
}

.rendered-markdown blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 14px 20px;
  border-radius: 0 10px 10px 0;
  color: var(--text-main);
  margin: 24px 0;
}

.rendered-markdown table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
}

.rendered-markdown table th, 
.rendered-markdown table td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
}

.rendered-markdown table th {
  background: var(--bg-card-inner);
  color: var(--text-main);
  font-weight: 700;
}

/* ==========================================================================
   Accordion
   ========================================================================== */

.accordion-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px !important;
  margin-bottom: 12px;
  overflow: hidden;
}

.accordion-button {
  background-color: var(--bg-card);
  color: var(--text-main);
  font-weight: 600;
  padding: 16px 20px;
  box-shadow: none !important;
}

.accordion-button:not(.collapsed) {
  background-color: var(--primary-light);
  color: var(--primary);
}

.accordion-body {
  background-color: var(--bg-card);
  color: var(--text-body);
  border-top: 1px solid var(--border-color);
  padding: 20px;
}

/* Content Container Wrapper */
.content-wrapper {
  flex-grow: 1;
}