/* Therapeutic Modalities Guide - Main Styles */
/* Design System: 8px grid, neutral color palette, system fonts */

/* ============================================
   CSS Variables & Design Tokens
   ============================================ */
:root {
  /* Color Palette */
  --color-background: #FAFAF8;
  --color-primary-text: #2D2D2D;
  --color-secondary-text: #8E8E8E;
  --color-accent: #9CAF9C;
  --color-card-bg: #FFFFFF;
  --color-border: #E5E5E5;
  --color-hover: #F5F5F3;
  --color-focus: #9CAF9C;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Ubuntu", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --font-size-small: 14px;
  --font-size-large: 18px;
  --font-size-xl: 24px;
  --font-size-xxl: 32px;
  --line-height-base: 1.6;
  --line-height-tight: 1.3;
  
  /* Spacing (8px grid system) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  
  /* Shadows */
  --shadow-card: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.12);
  --shadow-focus: 0 0 0 3px rgba(156, 175, 156, 0.3);
  
  /* Border Radius */
  --radius-small: 4px;
  --radius-medium: 8px;
  --radius-large: 12px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

h1 {
  font-size: var(--font-size-xxl);
  margin-bottom: var(--space-3);
}

h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-large);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-2);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-text);
}

a:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ============================================
   Layout Components
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.header {
  background-color: var(--color-card-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-card);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}

.site-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary-text);
  margin: 0;
}

.site-tagline {
  font-size: var(--font-size-small);
  color: var(--color-secondary-text);
  margin-top: var(--space-1);
}

.header-actions {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

/* ============================================
   Navigation
   ============================================ */
.nav-breadcrumb {
  padding: var(--space-2) 0;
  font-size: var(--font-size-small);
  color: var(--color-secondary-text);
}

.nav-breadcrumb a {
  color: var(--color-secondary-text);
}

.nav-breadcrumb a:hover {
  color: var(--color-accent);
}

.nav-breadcrumb span {
  margin: 0 var(--space-1);
}

.sidebar {
  position: fixed;
  left: 0;
  top: 80px;
  width: 240px;
  height: calc(100vh - 80px);
  background-color: var(--color-card-bg);
  border-right: 1px solid var(--color-border);
  padding: var(--space-3);
  overflow-y: auto;
  z-index: 50;
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: var(--space-1);
}

.sidebar-nav a {
  display: block;
  padding: var(--space-1) var(--space-2);
  color: var(--color-primary-text);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-fast);
}

.sidebar-nav a:hover {
  background-color: var(--color-hover);
}

.sidebar-nav a.active {
  background-color: var(--color-accent);
  color: white;
}

.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

.page-nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  color: var(--color-primary-text);
  font-size: var(--font-size-small);
  transition: all var(--transition-base);
}

.page-nav-link:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
  padding: var(--space-4) 0;
  min-height: calc(100vh - 200px);
}

.content-with-sidebar {
  margin-left: 260px;
}

.intro-section {
  text-align: center;
  margin-bottom: var(--space-6);
}

.intro-section h1 {
  margin-bottom: var(--space-2);
}

.intro-section p {
  font-size: var(--font-size-large);
  color: var(--color-secondary-text);
  max-width: 600px;
  margin: 0 auto var(--space-4);
}

/* ============================================
   Search Component
   ============================================ */
.search-container {
  max-width: 600px;
  margin: 0 auto var(--space-6);
}

.search-input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-large);
  background-color: var(--color-card-bg);
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-focus);
}

.search-results {
  margin-top: var(--space-2);
  background-color: var(--color-card-bg);
  border-radius: var(--radius-medium);
  box-shadow: var(--shadow-card);
  max-height: 400px;
  overflow-y: auto;
  display: none;
}

.search-results.active {
  display: block;
}

.search-result-item {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.search-result-item:hover {
  background-color: var(--color-hover);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-title {
  font-weight: 600;
  color: var(--color-primary-text);
  margin-bottom: var(--space-1);
}

.search-result-context {
  font-size: var(--font-size-small);
  color: var(--color-secondary-text);
}

/* ============================================
   Card Grid
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.therapy-card {
  background-color: var(--color-card-bg);
  border-radius: var(--radius-large);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  color: var(--color-primary-text);
  display: block;
}

.therapy-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.therapy-card:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.therapy-card-abbr {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.therapy-card-name {
  font-size: var(--font-size-large);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.therapy-card-description {
  font-size: var(--font-size-small);
  color: var(--color-secondary-text);
  line-height: var(--line-height-base);
}

/* ============================================
   Content Sections
   ============================================ */
.content-section {
  background-color: var(--color-card-bg);
  border-radius: var(--radius-large);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-card);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary-text);
  margin: 0;
}

.section-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-secondary-text);
  transition: transform var(--transition-base);
}

.section-toggle.expanded {
  transform: rotate(180deg);
}

.section-content {
  display: block;
}

.section-content.collapsed {
  display: none;
}

.subsection {
  margin-bottom: var(--space-4);
}

.subsection:last-child {
  margin-bottom: 0;
}

.subsection-title {
  font-size: var(--font-size-large);
  font-weight: 600;
  color: var(--color-primary-text);
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 2px solid var(--color-accent);
}

/* ============================================
   Lists & Items
   ============================================ */
.technique-list,
.concept-list {
  list-style: none;
}

.technique-item,
.concept-item {
  background-color: var(--color-background);
  border-left: 3px solid var(--color-accent);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-2);
  border-radius: var(--radius-small);
}

.item-title {
  font-weight: 600;
  color: var(--color-primary-text);
  margin-bottom: var(--space-1);
}

.item-description {
  color: var(--color-secondary-text);
  font-size: var(--font-size-small);
}

.numbered-list {
  counter-reset: item-counter;
  list-style: none;
}

.numbered-list li {
  counter-increment: item-counter;
  position: relative;
  padding-left: var(--space-5);
  margin-bottom: var(--space-3);
}

.numbered-list li::before {
  content: counter(item-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  background-color: var(--color-accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--font-size-small);
}

/* ============================================
   Buttons & Controls
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  font-weight: 500;
  border: none;
  border-radius: var(--radius-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  background-color: #8A9E8A;
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
}

.btn-secondary {
  background-color: var(--color-card-bg);
  color: var(--color-primary-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-hover);
  border-color: var(--color-accent);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  border: none;
  color: var(--color-secondary-text);
  cursor: pointer;
  border-radius: var(--radius-small);
  transition: all var(--transition-fast);
}

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

.btn-icon:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ============================================
   Tools & Utilities
   ============================================ */
.tools-bar {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
}

.quick-jump {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.quick-jump-link {
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-background);
  border-radius: var(--radius-small);
  font-size: var(--font-size-small);
  color: var(--color-primary-text);
  transition: all var(--transition-fast);
}

.quick-jump-link:hover {
  background-color: var(--color-accent);
  color: white;
}

/* ============================================
   Diagrams & Visual Elements
   ============================================ */
.diagram-container {
  background-color: var(--color-background);
  border-radius: var(--radius-medium);
  padding: var(--space-4);
  margin: var(--space-3) 0;
  text-align: center;
}

.triangle-diagram {
  max-width: 400px;
  margin: 0 auto;
}

.hexaflex-diagram {
  max-width: 500px;
  margin: 0 auto;
}

/* ============================================
   Tables
   ============================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0;
}

.data-table th,
.data-table td {
  padding: var(--space-2);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background-color: var(--color-background);
  font-weight: 600;
  color: var(--color-primary-text);
}

.data-table tr:hover {
  background-color: var(--color-hover);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background-color: var(--color-card-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  margin-top: var(--space-8);
  text-align: center;
  color: var(--color-secondary-text);
  font-size: var(--font-size-small);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }
  
  .sidebar.active {
    transform: translateX(0);
  }
  
  .content-with-sidebar {
    margin-left: 0;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-base: 15px;
    --font-size-xxl: 28px;
    --font-size-xl: 22px;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .page-nav {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .page-nav-link {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-2);
  }
  
  .content-section {
    padding: var(--space-3);
  }
  
  .therapy-card {
    padding: var(--space-3);
  }
}

/* ============================================
   Accessibility
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: var(--space-2);
  text-decoration: none;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .header,
  .sidebar,
  .tools-bar,
  .page-nav,
  .footer {
    display: none;
  }
  
  .content-with-sidebar {
    margin-left: 0;
  }
  
  .content-section {
    box-shadow: none;
    border: 1px solid var(--color-border);
    page-break-inside: avoid;
  }
}