/* ===================================
   NTH DIGITAL DESIGN SYSTEM
   ===================================
   CSS Custom Properties System with:
   - Color palette (primary gradient #667eea to #764ba2, accent blue #4299e1)
   - Typography hierarchy with 'Segoe UI' font stack
   - Shadow system (light, medium, heavy variations)
   - Spacing scale using clamp() functions
   - Mobile-first responsive design
   =================================== */

:root {
  /* === PRIMARY COLORS === */
  --color-primary-start: #667eea;
  --color-primary-end: #764ba2;
  --color-accent: #4299e1;
  --color-accent-hover: #3182ce;

  /* === NEUTRAL COLORS === */
  --color-white: #ffffff;
  --color-gray-50: #f7fafc;
  --color-gray-100: #edf2f7;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e0;
  --color-gray-400: #a0aec0;
  --color-gray-500: #718096;
  --color-gray-600: #4a5568;
  --color-gray-700: #2d3748;
  --color-gray-800: #1a202c;
  --color-gray-900: #171923;

  /* === STATUS COLORS === */
  --color-success: #48bb78;
  --color-warning: #ed8936;
  --color-error: #f56565;
  --color-info: #4299e1;

  /* === TYPOGRAPHY === */
  --font-family-primary: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-family-mono: 'Consolas', 'Monaco', 'Courier New', monospace;

  /* Typography Scale using clamp() for responsive scaling */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.8rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.3vw, 0.95rem);
  --font-size-base: clamp(1rem, 0.95rem + 0.4vw, 1.1rem);
  --font-size-lg: clamp(1.125rem, 1.05rem + 0.5vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.15rem + 0.6vw, 1.4rem);
  --font-size-2xl: clamp(1.5rem, 1.35rem + 0.8vw, 1.75rem);
  --font-size-3xl: clamp(1.875rem, 1.65rem + 1.1vw, 2.25rem);
  --font-size-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);
  --font-size-5xl: clamp(3rem, 2.5rem + 2.5vw, 4rem);

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* === SPACING SCALE === */
  /* Using clamp() for responsive spacing */
  --space-1: clamp(0.25rem, 0.2rem + 0.2vw, 0.3rem);
  --space-2: clamp(0.5rem, 0.4rem + 0.4vw, 0.6rem);
  --space-3: clamp(0.75rem, 0.6rem + 0.6vw, 0.9rem);
  --space-4: clamp(1rem, 0.8rem + 0.8vw, 1.2rem);
  --space-5: clamp(1.25rem, 1rem + 1vw, 1.5rem);
  --space-6: clamp(1.5rem, 1.2rem + 1.2vw, 1.8rem);
  --space-8: clamp(2rem, 1.6rem + 1.6vw, 2.4rem);
  --space-10: clamp(2.5rem, 2rem + 2vw, 3rem);
  --space-12: clamp(3rem, 2.4rem + 2.4vw, 3.6rem);
  --space-16: clamp(4rem, 3.2rem + 3.2vw, 4.8rem);
  --space-20: clamp(5rem, 4rem + 4vw, 6rem);
  --space-24: clamp(6rem, 4.8rem + 4.8vw, 7.2rem);
  --space-32: clamp(8rem, 6.4rem + 6.4vw, 9.6rem);

  /* === SHADOW SYSTEM === */
  /* Light shadows for cards and hover states */
  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  /* Medium shadows for elevated components */
  --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  /* Heavy shadows for modals and dropdowns */
  --shadow-heavy: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  /* Inner shadow for inputs and pressed states */
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  /* === BORDER RADIUS === */
  --radius-sm: 0.125rem;
  --radius-base: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* === BREAKPOINTS === */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* === TRANSITIONS === */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* === Z-INDEX SCALE === */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* === RESET AND BASE STYLES === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY UTILITIES === */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.leading-tight { line-height: var(--line-height-tight); }
.leading-snug { line-height: var(--line-height-snug); }
.leading-normal { line-height: var(--line-height-normal); }
.leading-relaxed { line-height: var(--line-height-relaxed); }
.leading-loose { line-height: var(--line-height-loose); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* === HEADING STYLES === */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
  color: var(--color-gray-900);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

h1:focus {
  outline: none;
}

/* === LINK STYLES === */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover, a:focus {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

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

/* === UTILITY CLASSES === */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }

.grid { display: grid; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }

/* Margin utilities */
.m-0 { margin: 0; }
.m-2 { margin: var(--space-2); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

/* Padding utilities */
.p-0 { padding: 0; }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }

.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }

/* Color utilities */
.text-white { color: var(--color-white); }
.text-gray-500 { color: var(--color-gray-500); }
.text-gray-600 { color: var(--color-gray-600); }
.text-gray-700 { color: var(--color-gray-700); }
.text-gray-800 { color: var(--color-gray-800); }
.text-gray-900 { color: var(--color-gray-900); }
.text-primary { color: var(--color-primary-start); }
.text-accent { color: var(--color-accent); }

.bg-white { background-color: var(--color-white); }
.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }
.bg-gray-800 { background-color: var(--color-gray-800); }
.bg-gray-900 { background-color: var(--color-gray-900); }

/* Gradient backgrounds */
.bg-gradient-primary {
  background: linear-gradient(135deg, var(--color-primary-start) 0%, var(--color-primary-end) 100%);
}

/* Shadow utilities */
.shadow-light { box-shadow: var(--shadow-light); }
.shadow-medium { box-shadow: var(--shadow-medium); }
.shadow-heavy { box-shadow: var(--shadow-heavy); }

/* Border radius utilities */
.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

/* === RESPONSIVE UTILITIES === */
@media (min-width: 640px) {
  .sm\:block { display: block; }
  .sm\:hidden { display: none; }
  .sm\:flex { display: flex; }
  .sm\:text-left { text-align: left; }
  .sm\:text-center { text-align: center; }
  .sm\:px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
  .sm\:py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
}

@media (min-width: 768px) {
  .md\:block { display: block; }
  .md\:hidden { display: none; }
  .md\:flex { display: flex; }
  .md\:flex-row { flex-direction: row; }
  .md\:items-center { align-items: center; }
  .md\:text-left { text-align: left; }
  .md\:text-center { text-align: center; }
  .md\:px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }
  .md\:py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
}

@media (min-width: 1024px) {
  .lg\:block { display: block; }
  .lg\:hidden { display: none; }
  .lg\:flex { display: flex; }
  .lg\:px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }
  .lg\:py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }
}

/* === FORM STYLES === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  user-select: none;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-primary-start) 0%, var(--color-primary-end) 100%);
  box-shadow: var(--shadow-light);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-medium);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-light);
}

.btn-secondary {
  color: var(--color-gray-700);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  box-shadow: var(--shadow-light);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-gray-50);
  border-color: var(--color-gray-400);
}

.btn-outline {
  color: var(--color-accent);
  background-color: transparent;
  border: 2px solid var(--color-accent);
}

.btn-outline:hover:not(:disabled) {
  color: var(--color-white);
  background-color: var(--color-accent);
}

.btn-link {
  color: var(--color-accent);
  background-color: transparent;
  padding: 0;
  border: none;
  box-shadow: none;
}

.btn-link:hover:not(:disabled) {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

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

/* Form controls */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
}

.form-control::placeholder {
  color: var(--color-gray-500);
}

/* Validation styles */
.valid.modified:not([type=checkbox]) {
  outline: 1px solid var(--color-success);
}

.invalid {
  outline: 1px solid var(--color-error);
}

.validation-message {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--space-1);
}

/* === CONTENT LAYOUT === */
.content {
  padding-top: var(--space-6);
  min-height: calc(100vh - 200px);
}

/* === ERROR HANDLING === */
#blazor-error-ui {
  background: linear-gradient(135deg, var(--color-error) 0%, #e53e3e 100%);
  bottom: 0;
  box-shadow: var(--shadow-heavy);
  display: none;
  left: 0;
  padding: var(--space-4) var(--space-6);
  position: fixed;
  width: 100%;
  z-index: var(--z-modal);
  color: var(--color-white);
}

#blazor-error-ui .dismiss {
  cursor: pointer;
  position: absolute;
  right: var(--space-4);
  top: var(--space-4);
  font-size: var(--font-size-lg);
}

.blazor-error-boundary {
  background: linear-gradient(135deg, var(--color-error) 0%, #e53e3e 100%);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  color: var(--color-white);
  margin: var(--space-4) 0;
}

.blazor-error-boundary::after {
  content: "An error has occurred.";
  font-weight: var(--font-weight-semibold);
}

/* === LOADING STATES === */
.loading-progress {
  position: relative;
  display: block;
  width: 8rem;
  height: 8rem;
  margin: 20vh auto var(--space-4) auto;
}

.loading-progress circle {
  fill: none;
  stroke: var(--color-gray-200);
  stroke-width: 0.6rem;
  transform-origin: 50% 50%;
  transform: rotate(-90deg);
}

.loading-progress circle:last-child {
  stroke: var(--color-accent);
  stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
  transition: stroke-dasharray 0.05s ease-in-out;
}

.loading-progress-text {
  position: absolute;
  text-align: center;
  font-weight: var(--font-weight-semibold);
  inset: calc(20vh + 3.25rem) 0 auto 0.2rem;
  color: var(--color-gray-700);
}

.loading-progress-text:after {
  content: var(--blazor-load-percentage-text, "Loading");
}

/* === CODE STYLING === */
code {
  color: var(--color-primary-end);
  font-family: var(--font-family-mono);
  font-size: 0.875em;
  background-color: var(--color-gray-100);
  padding: 0.125rem 0.25rem;
  border-radius: var(--radius-sm);
}

pre {
  background-color: var(--color-gray-900);
  color: var(--color-gray-100);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
}

/* === HEADER COMPONENT STYLES === */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-content {
  min-height: 4rem;
}

.header-logo img {
  height: 2rem;
  width: auto;
  transition: transform var(--transition-fast);
}

.header-logo:hover img {
  transform: scale(1.05);
}

.nav-link {
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -0.25rem;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--color-primary-start) 0%, var(--color-primary-end) 100%);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.mobile-menu-toggle svg {
  transition: transform var(--transition-fast);
}

.mobile-menu-toggle:hover svg {
  transform: scale(1.1);
}

.mobile-nav {
  animation: slideDown var(--transition-fast) ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-nav .nav-link {
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.mobile-nav .nav-link:hover {
  background-color: var(--color-gray-50);
}

.mobile-nav .nav-link::after {
  display: none; /* Remove underline effect on mobile */
}

/* === 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: 0;
}

/* Focus outline improvements */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@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;
  }
}