/* ============================================================================
   Simple Loan Aggregator Landing Page - Professional CSS Styling
   Mobile-First Responsive Design with Accessibility & Modern CSS Features
   ============================================================================ */

/* ============================================================================
   CSS Custom Properties - Design Tokens
   ============================================================================ */

:root {
  /* Color Palette - Financial Services Professional Theme */
  /* Primary Colors - Trust & Reliability (Blue) */
  --color-primary-50: hsl(210, 80%, 97%);
  --color-primary-100: hsl(210, 80%, 92%);
  --color-primary-200: hsl(210, 78%, 85%);
  --color-primary-300: hsl(210, 76%, 75%);
  --color-primary-400: hsl(210, 74%, 60%);
  --color-primary-500: hsl(210, 75%, 45%);
  --color-primary-600: hsl(210, 80%, 35%);
  --color-primary-700: hsl(210, 82%, 25%);
  --color-primary-800: hsl(210, 85%, 18%);
  --color-primary-900: hsl(210, 88%, 12%);

  /* Accent Colors - Action & Success (Green) */
  --color-accent-400: hsl(145, 63%, 49%);
  --color-accent-500: hsl(145, 63%, 42%);
  --color-accent-600: hsl(145, 63%, 35%);

  /* Neutral Colors */
  --color-neutral-50: hsl(0, 0%, 98%);
  --color-neutral-100: hsl(0, 0%, 95%);
  --color-neutral-200: hsl(0, 0%, 88%);
  --color-neutral-300: hsl(0, 0%, 75%);
  --color-neutral-400: hsl(0, 0%, 60%);
  --color-neutral-500: hsl(0, 0%, 45%);
  --color-neutral-600: hsl(0, 0%, 35%);
  --color-neutral-700: hsl(0, 0%, 25%);
  --color-neutral-800: hsl(0, 0%, 15%);
  --color-neutral-900: hsl(0, 0%, 8%);

  /* Semantic Colors */
  --color-background: var(--color-neutral-50);
  --color-surface: #ffffff;
  --color-text-primary: var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-600);
  --color-text-muted: var(--color-neutral-500);
  --color-border: var(--color-neutral-200);
  --color-shadow: hsla(210, 20%, 20%, 0.08);

  /* Fluid Typography - Mobile-First with clamp() */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.375rem);
  --font-size-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.625rem);
  --font-size-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
  --font-size-3xl: clamp(1.875rem, 1.65rem + 1.125vw, 2.625rem);
  --font-size-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3.25rem);

  /* Font Weights */
  --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;

  /* Fluid Spacing - Mobile-First */
  --space-xs: clamp(0.5rem, 0.45rem + 0.25vw, 0.625rem);
  --space-sm: clamp(0.75rem, 0.675rem + 0.375vw, 1rem);
  --space-md: clamp(1rem, 0.9rem + 0.5vw, 1.5rem);
  --space-lg: clamp(1.5rem, 1.35rem + 0.75vw, 2.25rem);
  --space-xl: clamp(2rem, 1.8rem + 1vw, 3rem);
  --space-2xl: clamp(3rem, 2.7rem + 1.5vw, 4.5rem);
  --space-3xl: clamp(4rem, 3.6rem + 2vw, 6rem);

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows - WCAG AA compliant */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
  --shadow-xl: 0 20px 25px -5px var(--color-shadow), 0 10px 10px -5px var(--color-shadow);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout Constraints */
  --max-width-prose: 65ch;
  --max-width-container: 1280px;
  --max-width-narrow: 768px;
}

/* ============================================================================
   CSS Reset & Base Styles
   ============================================================================ */

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

html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  min-height: 100vh;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
}

ul[role='list'],
ol[role='list'] {
  list-style: none;
}

/* ============================================================================
   Typography
   ============================================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-md);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
  color: var(--color-primary-700);
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
  color: var(--color-primary-600);
}

p {
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
  text-decoration: underline;
}

a:active {
  color: var(--color-primary-800);
}

/* ============================================================================
   Accessibility - Skip Link
   ============================================================================ */

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background-color: var(--color-primary-600);
  color: #ffffff;
  padding: var(--space-sm) var(--space-md);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  z-index: 1000;
  transition: top var(--transition-fast);
  border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-accent-400);
  outline-offset: 2px;
}

/* ============================================================================
   Focus Styles - Accessibility (WCAG AA Compliant)
   ============================================================================ */

:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-accent-400);
  outline-offset: 3px;
}

/* ============================================================================
   Header Section
   ============================================================================ */

header {
  background: linear-gradient(135deg, var(--color-primary-700) 0%, var(--color-primary-600) 100%);
  color: #ffffff;
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(30deg, rgba(255, 255, 255, 0.05) 12%, transparent 12.5%, transparent 87%, rgba(255, 255, 255, 0.05) 87.5%, rgba(255, 255, 255, 0.05)),
    linear-gradient(150deg, rgba(255, 255, 255, 0.05) 12%, transparent 12.5%, transparent 87%, rgba(255, 255, 255, 0.05) 87.5%, rgba(255, 255, 255, 0.05)),
    linear-gradient(30deg, rgba(255, 255, 255, 0.05) 12%, transparent 12.5%, transparent 87%, rgba(255, 255, 255, 0.05) 87.5%, rgba(255, 255, 255, 0.05)),
    linear-gradient(150deg, rgba(255, 255, 255, 0.05) 12%, transparent 12.5%, transparent 87%, rgba(255, 255, 255, 0.05) 87.5%, rgba(255, 255, 255, 0.05));
  background-size: 80px 140px;
  background-position: 0 0, 0 0, 40px 70px, 40px 70px;
  pointer-events: none;
}

.header-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width-container);
  margin: 0 auto;
}

header h1 {
  color: #ffffff;
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-sm);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.tagline {
  font-size: var(--font-size-lg);
  color: var(--color-primary-50);
  font-weight: var(--font-weight-medium);
  margin-bottom: 0;
  opacity: 0.95;
}

/* ============================================================================
   Main Content Layout
   ============================================================================ */

main {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

section {
  margin-bottom: var(--space-3xl);
}

section:last-child {
  margin-bottom: 0;
}

section > h2 {
  text-align: center;
  margin-bottom: var(--space-md);
}

section > p {
  text-align: center;
  max-width: var(--max-width-prose);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-lg);
}

/* ============================================================================
   Services Section - CSS Grid Layout
   ============================================================================ */

.services-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.service-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-accent-400));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.service-item:hover::before {
  transform: scaleX(1);
}

.service-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-200);
}

.service-item:active {
  transform: translateY(-2px);
}

.service-item h3 {
  color: var(--color-primary-700);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.service-item p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* ============================================================================
   Contact Section - Flexbox Layout
   ============================================================================ */

.contact-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.contact-item {
  background-color: var(--color-surface);
  border: 2px solid var(--color-primary-100);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.contact-item:hover {
  border-color: var(--color-primary-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.contact-item h3 {
  color: var(--color-primary-700);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
}

.contact-item p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.contact-item p:last-child {
  margin-bottom: 0;
}

.contact-item a {
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary-600);
  display: inline-block;
  padding: var(--space-xs) 0;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.contact-item a:hover {
  color: var(--color-primary-700);
  text-decoration: none;
  transform: scale(1.05);
}

.contact-item a:focus-visible {
  outline: 2px solid var(--color-accent-400);
  outline-offset: 4px;
}

/* Touch-friendly tap targets for mobile (44px minimum) */
@media (pointer: coarse) {
  .contact-item a {
    padding: var(--space-sm);
    margin: calc(var(--space-xs) * -1);
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

/* ============================================================================
   Responsive Design - Tablet (768px+)
   ============================================================================ */

@media (min-width: 768px) {
  header {
    padding: var(--space-3xl) var(--space-lg);
  }

  header h1 {
    font-size: var(--font-size-4xl);
  }

  .tagline {
    font-size: var(--font-size-xl);
  }

  main {
    padding: var(--space-2xl) var(--space-lg);
  }

  .services-list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }

  .contact-info {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }

  .contact-item:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    max-width: 500px;
    margin: 0 auto;
  }
}

/* ============================================================================
   Responsive Design - Desktop (1024px+)
   ============================================================================ */

@media (min-width: 1024px) {
  main {
    padding: var(--space-3xl) var(--space-xl);
  }

  .services-list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
  }

  .contact-info {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-2xl);
  }

  .contact-item:last-child:nth-child(odd) {
    grid-column: auto;
    max-width: none;
    margin: 0;
  }

  .service-item {
    padding: var(--space-xl);
  }

  .contact-item {
    padding: var(--space-xl);
  }

  .service-item:hover {
    transform: translateY(-6px);
  }
}

/* ============================================================================
   Print Styles
   ============================================================================ */

@media print {
  .skip-link {
    display: none !important;
  }

  * {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  h1,
  h2,
  h3 {
    page-break-after: avoid;
  }

  a[href^="http"]:after {
    content: " (" attr(href) ")";
    font-size: 0.875rem;
    color: #666;
  }

  a[href^="mailto:"]:after,
  a[href^="tel:"]:after {
    content: "";
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  @page {
    margin: 2cm;
  }
}

/* ============================================================================
   Reduced Motion - Accessibility
   ============================================================================ */

@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;
  }
}

/* ============================================================================
   High Contrast Mode - Accessibility (WCAG AA)
   ============================================================================ */

@media (prefers-contrast: high) {
  :root {
    --color-primary-500: hsl(210, 100%, 40%);
    --color-primary-600: hsl(210, 100%, 30%);
    --color-primary-700: hsl(210, 100%, 20%);
    --color-border: hsl(0, 0%, 40%);
  }

  .service-item,
  .contact-item {
    border-width: 2px;
  }

  a {
    text-decoration: underline;
  }
}

/* ============================================================================
   Dark Mode Support - System Preference
   ============================================================================ */

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: var(--color-neutral-900);
    --color-surface: var(--color-neutral-800);
    --color-text-primary: var(--color-neutral-50);
    --color-text-secondary: var(--color-neutral-300);
    --color-text-muted: var(--color-neutral-400);
    --color-border: var(--color-neutral-700);
    --color-shadow: hsla(0, 0%, 0%, 0.3);
  }

  header {
    background: linear-gradient(135deg, var(--color-primary-800) 0%, var(--color-primary-700) 100%);
  }

  .service-item,
  .contact-item {
    background-color: var(--color-neutral-800);
    border-color: var(--color-neutral-700);
  }

  .service-item:hover,
  .contact-item:hover {
    border-color: var(--color-primary-600);
  }
}