/**
 * Affinius Capital - Research & Analytics Landing Page
 * CSS Architecture: BEM (Block Element Modifier) Methodology
 *
 * Table of Contents:
 * 1. CSS Reset
 * 2. Custom Properties (Design Tokens)
 * 3. Base Styles
 * 4. Layout Components
 * 5. UI Components
 * 6. Utilities
 * 7. Media Queries
 * 8. Accessibility
 */

/* ========================================
   1. CSS RESET
   ======================================== */

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

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  line-height: 1.6;
  min-height: 100vh;
  text-rendering: optimizeSpeed;
}

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

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

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

/* ========================================
   2. CUSTOM PROPERTIES (Design Tokens)
   ======================================== */

:root {
  /* Colors - From Affinius Brand Toolkit */
  --color-rust: #B5674E;
  --color-dark-teal: #3D5554;
  --color-charcoal: #2B3331;
  --color-light-gray: #E8ECEB;
  --color-mid-gray: #C4CAC8;
  --color-white: #FFFFFF;
  --color-off-white: #F5F7F6;

  /* Semantic Colors */
  --color-primary: var(--color-rust);
  --color-text: var(--color-charcoal);
  --color-text-muted: var(--color-dark-teal);
  --color-background: var(--color-white);
  --color-background-alt: var(--color-off-white);
  --color-border: var(--color-light-gray);
  --color-link: var(--color-dark-teal);
  --color-link-hover: var(--color-rust);

  /* Typography */
  --font-family: 'GT Planar', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-thin: 200;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;

  /* Font Sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */

  /* Spacing */
  --spacing-xs: 0.5rem;   /* 8px */
  --spacing-sm: 1rem;     /* 16px */
  --spacing-md: 1.5rem;   /* 24px */
  --spacing-lg: 2rem;     /* 32px */
  --spacing-xl: 3rem;     /* 48px */
  --spacing-2xl: 4rem;    /* 64px */
  --spacing-3xl: 6rem;    /* 96px */

  /* Layout */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-md);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index */
  --z-index-header: 100;
  --z-index-dropdown: 200;
  --z-index-modal: 300;
}

/* ========================================
   3. BASE STYLES
   ======================================== */

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  color: var(--color-text);
  background-color: var(--color-background);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-medium);
  line-height: 1.2;
  color: var(--color-charcoal);
}

h1 {
  font-size: var(--font-size-5xl);
}

h2 {
  font-size: var(--font-size-4xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

p {
  line-height: 1.7;
}

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

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

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ========================================
   4. LAYOUT COMPONENTS
   ======================================== */

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  width: 100%;
}

/* Skip Link (Accessibility) */
.skip-link {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-rust);
  color: var(--color-white);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transform: translateY(-200%);
  transition: transform var(--transition-base);
  z-index: calc(var(--z-index-modal) + 1);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Site Header */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-index-header);
  box-shadow: var(--shadow-sm);
}

.site-header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__logo img {
  height: 40px;
  width: auto;
}

.site-header__nav {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-primary);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-off-white) 0%, var(--color-white) 100%);
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  text-align: center;
}

.hero__content {
  max-width: 800px;
  margin: 0 auto;
}

.hero__title {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-md);
  color: var(--color-charcoal);
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.hero__description {
  font-size: var(--font-size-lg);
  line-height: 1.8;
  color: var(--color-text);
  max-width: 700px;
  margin: 0 auto;
}

/* Section Styles */
section {
  padding: var(--spacing-2xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.section-description {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* Applications Section */
.applications {
  background-color: var(--color-background);
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

/* Loading State */
.loading-state {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.skeleton-card {
  background: linear-gradient(
    90deg,
    var(--color-light-gray) 25%,
    var(--color-mid-gray) 50%,
    var(--color-light-gray) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  height: 350px;
  border-radius: var(--radius-lg);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Technology Section */
.technology {
  background-color: var(--color-off-white);
}

.technology__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.technology__item {
  padding: var(--spacing-lg);
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.technology__item:hover {
  box-shadow: var(--shadow-md);
}

.technology__item-title {
  margin-bottom: var(--spacing-sm);
  color: var(--color-charcoal);
}

.technology__item-description {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Support Section */
.support {
  background-color: var(--color-background);
  text-align: center;
}

.support__description {
  max-width: 600px;
  margin: 0 auto var(--spacing-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
}

.support__contact {
  font-size: var(--font-size-lg);
}

.support__email {
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  text-decoration: underline;
}

.support__email:hover {
  color: var(--color-dark-teal);
}

/* Site Footer */
.site-footer {
  background-color: var(--color-charcoal);
  color: var(--color-off-white);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.site-footer__content {
  text-align: center;
}

.site-footer__logo {
  margin-bottom: var(--spacing-lg);
}

.site-footer__logo img {
  filter: brightness(0) invert(1);
  margin: 0 auto;
}

.site-footer__links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.footer-link {
  color: var(--color-off-white);
  transition: color var(--transition-fast);
}

.footer-link:hover,
.footer-link:focus {
  color: var(--color-rust);
}

.site-footer__copyright {
  color: var(--color-mid-gray);
  font-size: var(--font-size-sm);
}

/* ========================================
   5. UI COMPONENTS
   ======================================== */

/* App Card */
.app-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.app-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-rust);
}

.app-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-rust) 0%, var(--color-dark-teal) 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.app-card:hover::before {
  transform: scaleX(1);
}

.app-card--featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: var(--spacing-lg);
  align-items: start;
}

.app-card__icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.app-card--featured .app-card__icon {
  width: 100px;
  height: 100px;
  margin-bottom: 0;
}

.app-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.app-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
  color: var(--color-charcoal);
}

.app-card--featured .app-card__title {
  font-size: var(--font-size-3xl);
}

.app-card__description {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
  line-height: 1.7;
}

.app-card__meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.app-card__type {
  font-weight: var(--font-weight-medium);
  color: var(--color-rust);
}

.app-card__updated {
  color: var(--color-text-muted);
}

.app-card__launch-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-rust);
  color: var(--color-white);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  align-self: flex-start;
  border: 2px solid var(--color-rust);
}

.app-card__launch-btn:hover,
.app-card__launch-btn:focus {
  background-color: var(--color-dark-teal);
  border-color: var(--color-dark-teal);
  color: var(--color-white);
  transform: translateX(2px);
}

.icon-external {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.app-card__launch-btn:hover .icon-external {
  transform: translate(2px, -2px);
}

/* Error State */
.error-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-2xl);
  background-color: var(--color-off-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.error-state h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-charcoal);
}

.error-state p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.error-state a {
  color: var(--color-rust);
  text-decoration: underline;
}

/* Button */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.button--primary {
  background-color: var(--color-rust);
  color: var(--color-white);
  border-color: var(--color-rust);
}

.button--primary:hover,
.button--primary:focus {
  background-color: var(--color-dark-teal);
  border-color: var(--color-dark-teal);
  color: var(--color-white);
}

/* 404 Error Page */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  background: linear-gradient(135deg, var(--color-off-white) 0%, var(--color-white) 100%);
}

.error-page__content {
  text-align: center;
  max-width: 600px;
}

.error-page__title {
  font-size: clamp(6rem, 15vw, 12rem);
  font-weight: var(--font-weight-medium);
  color: var(--color-rust);
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.error-page__subtitle {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.error-page__message {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
}

.error-page__support {
  margin-top: var(--spacing-lg);
  color: var(--color-text-muted);
}

/* ========================================
   6. UTILITIES
   ======================================== */

.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;
}

/* ========================================
   7. MEDIA QUERIES
   ======================================== */

@media (max-width: 768px) {
  :root {
    --container-padding: var(--spacing-sm);
  }

  .site-header__nav {
    gap: var(--spacing-md);
  }

  .nav-link {
    font-size: var(--font-size-sm);
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }

  section {
    padding: var(--spacing-xl) 0;
  }

  .apps-grid {
    grid-template-columns: 1fr;
  }

  .app-card--featured {
    grid-template-columns: 1fr;
  }

  .app-card--featured .app-card__icon {
    margin: 0 auto var(--spacing-md);
  }

  .technology__grid {
    grid-template-columns: 1fr;
  }

  .site-footer__links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .site-header__logo img {
    height: 30px;
  }

  .hero__title {
    font-size: var(--font-size-3xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-lg);
  }
}

/* ========================================
   8. ACCESSIBILITY
   ======================================== */

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

/* 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;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-text: #000000;
    --color-background: #FFFFFF;
    --color-border: #000000;
  }

  .app-card {
    border-width: 2px;
  }
}

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .skip-link {
    display: none;
  }

  .app-card {
    page-break-inside: avoid;
  }
}