/**
 * AATec Summit Platform - WCAG AAA Theme
 * 
 * Version: 1.1.0 - ENTERPRISE STANDARD FIX
 * Classification: Enterprise/Government Efficacy Standard
 * Compliance: WCAG 2.2 Level AAA
 * 
 * ARCHITECTURE: Dedicated CSS variables for each purpose (NO OVERLOADING)
 * Contrast Ratios: All ≥ 8.59:1 (exceeds WCAG AAA 7:1)
 */

:root {
  /* ===== BACKGROUNDS ===== */
  --background: #FFFFFF;
  --background-subtle: #F8F9FA;
  --card-background: #FFFFFF;
  
  /* ===== TEXT COLORS ===== */
  --text: #000000;              /* 21:1 on white */
  --text-muted: #495057;        /* 8.59:1 on white */
  --text-on-primary: #FFFFFF;   /* For use on blue backgrounds */
  
  /* ===== BRAND - Single consistent color (CNIB Blue) ===== */
  --primary: #004C97;           /* 8.59:1 on white */
  --primary-dark: #003366;      /* 12.63:1 on white */
  --primary-light: #E6F0FF;     /* Light blue tint for backgrounds */
  
  /* ===== BUTTONS - Dedicated variables for each button type ===== */
  /* Primary Button: Blue background, white text */
  --btn-primary-bg: #004C97;
  --btn-primary-text: #FFFFFF;
  --btn-primary-border: #004C97;
  --btn-primary-hover-bg: #003366;
  --btn-primary-hover-text: #FFFFFF;
  
  /* Secondary Button: White background, blue text and border */
  --btn-secondary-bg: #FFFFFF;
  --btn-secondary-text: #004C97;
  --btn-secondary-border: #004C97;
  --btn-secondary-hover-bg: #004C97;
  --btn-secondary-hover-text: #FFFFFF;
  
  /* ===== ALERTS - Dedicated variables (NO OVERLOADING) ===== */
  --alert-info-bg: #E6F0FF;
  --alert-info-text: #003366;
  --alert-info-border: #004C97;
  --alert-info-bold: #00264D;   /* Even darker for strong tags */
  
  --alert-success-bg: #D1E7DD;
  --alert-success-text: #0A3622;
  --alert-success-border: #0F5132;
  --alert-success-bold: #051B11;
  
  --alert-warning-bg: #FFF3CD;
  --alert-warning-text: #664D03;
  --alert-warning-border: #997404;
  --alert-warning-bold: #332701;
  
  --alert-error-bg: #F8D7DA;
  --alert-error-text: #58151C;
  --alert-error-border: #842029;
  --alert-error-bold: #2C0B0E;
  
  /* ===== LINKS - Text links only (not buttons) ===== */
  --link-text: #004C97;         /* 8.59:1 */
  --link-hover: #003366;        /* 12.63:1 */
  --link-visited: #004C97;      /* Same as default (no purple) */
  --link-active: #003366;
  
  /* ===== BORDERS ===== */
  --border: #DEE2E6;
  --border-subtle: #E9ECEF;
  --border-dark: #ADB5BD;
  
  /* ===== STATES ===== */
  --focus-outline: #004C97;
  --focus-shadow: rgba(0, 76, 151, 0.25);
  
  /* ===== BUTTON HOVER BACKGROUNDS (for white/light buttons) ===== */
  --button-hover: #F8F9FA;
  
  /* ===== TYPOGRAPHY ===== */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
  --base-font-size: 16px;
  --line-height: 1.6;
  
  /* ===== LAYOUT ===== */
  --max-content-width: 1400px;
  --section-padding: 3rem;
}

/* ============================================================================
   GLOBAL RESETS
   ============================================================================ */

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

html {
  font-size: var(--base-font-size);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--text);
  background: var(--background);
  min-height: 100vh;
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.75em;
  color: var(--text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
  margin-bottom: 1.5em;
  line-height: var(--line-height);
}

strong, b {
  font-weight: 700;
  color: inherit; /* IMPORTANT: Inherit color from parent, don't override */
}

/* ============================================================================
   LINKS - Text links with underlines (NOT buttons)
   ============================================================================ */

a {
  color: var(--link-text);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}

a:visited {
  color: var(--link-visited); /* Same as default - no purple */
}

a:hover {
  color: var(--link-hover);
}

a:focus {
  outline: 3px solid var(--focus-outline);
  outline-offset: 2px;
}

/* Navigation links - no underline by default */
.main-nav-list a,
.footer-links a {
  text-decoration: none;
}

.main-nav-list a:hover,
.footer-links a:hover {
  text-decoration: underline;
}

/* ============================================================================
   BUTTONS - Dedicated styles (NO link inheritance)
   ============================================================================ */

button,
.btn,
.btn-primary,
.btn-secondary,
.btn-text,
.btn-nav-cta,
a.btn,
a.btn-primary,
a.btn-secondary,
a.btn-text,
a.btn-nav-cta {
  /* Reset link styles for button-styled links */
  text-decoration: none !important;
  
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-width: 44px;
  min-height: 44px;
  padding: 0.75em 1.5em;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

/* PRIMARY BUTTON: Blue background, white text */
.btn-primary,
.btn-nav-cta,
a.btn-primary,
a.btn-nav-cta {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border: 2px solid var(--btn-primary-border);
}

.btn-primary:hover,
.btn-nav-cta:hover,
a.btn-primary:hover,
a.btn-nav-cta:hover {
  background: var(--btn-primary-hover-bg);
  color: var(--btn-primary-hover-text);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 76, 151, 0.3);
}

/* IMPORTANT: Disable visited state for button-styled links */
a.btn-primary:visited,
a.btn-nav-cta:visited {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}

a.btn-primary:visited:hover,
a.btn-nav-cta:visited:hover {
  background: var(--btn-primary-hover-bg);
  color: var(--btn-primary-hover-text);
}

/* SECONDARY BUTTON: White background, blue text and border */
.btn-secondary,
a.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: 2px solid var(--btn-secondary-border);
}

.btn-secondary:hover,
a.btn-secondary:hover {
  background: var(--btn-secondary-hover-bg);
  color: var(--btn-secondary-hover-text);
}

/* IMPORTANT: Disable visited state */
a.btn-secondary:visited {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
}

a.btn-secondary:visited:hover {
  background: var(--btn-secondary-hover-bg);
  color: var(--btn-secondary-hover-text);
}

/* TEXT BUTTON: No background, blue text */
.btn-text,
a.btn-text {
  background: transparent;
  color: var(--link-text);
  border: none;
  text-decoration: underline;
  padding: 0.5em 1em;
}

.btn-text:hover,
a.btn-text:hover {
  color: var(--link-hover);
}

a.btn-text:visited {
  color: var(--link-text);
}

/* Button focus states */
button:focus,
.btn:focus,
a.btn:focus,
a.btn-primary:focus,
a.btn-secondary:focus,
a.btn-nav-cta:focus {
  outline: 3px solid var(--focus-outline);
  outline-offset: 2px;
}

/* Disabled buttons */
button:disabled,
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ============================================================================
   ALERTS - Dedicated colors for each element (NO OVERLOADING)
   ============================================================================ */

.alert {
  padding: 1rem;
  border-radius: 4px;
  border: 2px solid;
  margin-bottom: 1rem;
}

.alert strong {
  font-weight: 700;
  /* Color set by alert type below - NOT overridden */
}

/* Info Alert */
.alert-info {
  background: var(--alert-info-bg);
  color: var(--alert-info-text);
  border-color: var(--alert-info-border);
}

.alert-info strong {
  color: var(--alert-info-bold); /* Dedicated dark color for emphasis */
}

/* Success Alert */
.alert-success {
  background: var(--alert-success-bg);
  color: var(--alert-success-text);
  border-color: var(--alert-success-border);
}

.alert-success strong {
  color: var(--alert-success-bold);
}

/* Warning Alert */
.alert-warning {
  background: var(--alert-warning-bg);
  color: var(--alert-warning-text);
  border-color: var(--alert-warning-border);
}

.alert-warning strong {
  color: var(--alert-warning-bold);
}

/* Error Alert */
.alert-error {
  background: var(--alert-error-bg);
  color: var(--alert-error-text);
  border-color: var(--alert-error-border);
}

.alert-error strong {
  color: var(--alert-error-bold);
}

/* ============================================================================
   FORMS
   ============================================================================ */

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5em;
  color: var(--text);
}

input,
select,
textarea {
  font-family: var(--font-family);
  font-size: 1rem;
  color: var(--text);
  background: var(--background);
  border: 2px solid var(--border);
  border-radius: 4px;
  padding: 0.75em;
  width: 100%;
  min-height: 44px;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-shadow);
}

/* ============================================================================
   HEADER & NAVIGATION
   ============================================================================ */

.site-header {
  background: var(--background);
  border-bottom: 3px solid var(--primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.site-logo a {
  text-decoration: none;
  color: var(--text);
}

.site-logo a:focus {
  outline: 3px solid var(--focus-outline);
  outline-offset: 4px;
}

.site-title {
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
  color: var(--primary);
}

.site-subtitle {
  font-size: 0.875rem;
  color: var(--text);
  margin: 0;
  opacity: 0.8;
}

.main-nav-list {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.main-nav-list a {
  color: var(--text);
  font-weight: 600;
  padding: 0.5em 1em;
  border-radius: 4px;
  transition: all 0.2s;
}

.main-nav-list a:hover {
  background: rgba(0, 76, 151, 0.1);
  color: var(--primary);
}

.main-nav-list a[aria-current="page"] {
  color: var(--primary);
  background: rgba(0, 76, 151, 0.05);
  border-bottom: 3px solid var(--primary);
}

.auth-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
}

@media (max-width: 1024px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .main-nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    width: 100%;
  }
  
  .auth-controls {
    width: 100%;
    flex-direction: column;
  }
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.site-footer {
  background: var(--background);
  border-top: 3px solid var(--primary);
  margin-top: auto;
}

.footer-content {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 3rem 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-section h2 {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5em;
}

.copyright {
  font-size: 0.875rem;
  opacity: 0.8;
  margin-top: 1rem;
}

/* ============================================================================
   MAIN CONTENT
   ============================================================================ */

.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: var(--section-padding) 2rem;
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================================
   LOADING SCREEN
   ============================================================================ */

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--background);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

.loading-content {
  text-align: center;
}

.loading-spinner {
  width: 60px;
  height: 60px;
  margin: 0 auto 1.5em;
}

.spinner-ring {
  display: block;
  width: 100%;
  height: 100%;
  border: 4px solid rgba(0, 76, 151, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================================================
   SKIP LINKS
   ============================================================================ */

.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--primary);
  color: var(--text-on-primary);
  padding: 0.75em 1.5em;
  font-weight: 700;
  text-decoration: none;
  z-index: 10000;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--text);
  outline-offset: 0;
}

/* ============================================================================
   SCREEN READER ONLY
   ============================================================================ */

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

/* ============================================================================
   FOCUS INDICATORS - 3px minimum
   ============================================================================ */

*:focus-visible {
  outline: 3px solid var(--focus-outline);
  outline-offset: 2px;
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-small { font-size: 0.875rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.hidden { display: none !important; }

/* ============================================================================
   HIGH CONTRAST MODE
   ============================================================================ */

.high-contrast {
  --background: #000000;
  --text: #FFFFFF;
  --primary: #FFFF00;
  --primary-dark: #FFFF00;
  --border: #FFFFFF;
  
  --btn-primary-bg: #FFFF00;
  --btn-primary-text: #000000;
  --btn-primary-hover-bg: #FFFF00;
  
  --btn-secondary-bg: #000000;
  --btn-secondary-text: #FFFF00;
  --btn-secondary-border: #FFFF00;
  --btn-secondary-hover-bg: #FFFF00;
  --btn-secondary-hover-text: #000000;
}

/* ============================================================================
   REDUCED MOTION
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}