/*
  ============================================
  LEAMHALLHUB.IO STYLESHEET
  Black & white professional developer portfolio
  ============================================

  STYLE GUIDE

  Colors:
  - Primary text: #171717
  - Secondary text: #525252
  - Borders: #e5e5e5
  - Background: #ffffff

  Typography:
  - Base: 16px, line-height 1.6
  - Headings: 600 weight

  Spacing Scale:
  - 8px, 16px, 24px, 32px, 48px, 64px

  Breakpoints:
  - Mobile: < 640px
  - Tablet: 640px+
  - Desktop: 768px+
*/

/* ============================================
   1. CSS RESET & BASE STYLES
   ============================================ */

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

* {
  margin: 0;
  padding: 0;
}

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

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

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

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

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

/* ============================================
   2. CSS CUSTOM PROPERTIES
   ============================================ */

:root {
  /* Colors - Pure B&W Foundation */
  --color-white: #ffffff;
  --color-black: #000000;

  /* Grayscale Spectrum */
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-600: #525252;
  --color-gray-800: #262626;
  --color-gray-900: #171717;

  /* Semantic Colors */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-inverse: var(--color-white);
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-gray-50);
  --color-border: var(--color-gray-200);
  --color-link: var(--color-black);
  --color-link-hover: var(--color-gray-600);

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.25rem;     /* 20px */
  --font-size-xl: 1.5rem;      /* 24px */
  --font-size-2xl: 2rem;       /* 32px */

  --line-height-tight: 1.25;
  --line-height-normal: 1.6;
  --line-height-loose: 1.8;

  /* 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 */

  /* Layout */
  --container-width: 960px;
  --container-narrow: 720px;
  --container-wide: 1200px;

  /* Breakpoints (for reference in media queries) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
}

/* ============================================
   3. TYPOGRAPHY SYSTEM
   ============================================ */

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-gray-900);
  margin-bottom: 0.5em;
}

h1 {
  font-size: var(--font-size-2xl);
}

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

h3 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: 1em;
}

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

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

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

strong, b {
  font-weight: 600;
}

em, i {
  font-style: italic;
}

ul, ol {
  margin-left: 1.5em;
  margin-bottom: 1em;
}

li {
  margin-bottom: 0.5em;
}

/* ============================================
   4. LAYOUT SYSTEM
   ============================================ */

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

.page-grid {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

/* ============================================
   5. NAVIGATION COMPONENT
   ============================================ */

.site-nav {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  background: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.nav-brand a {
  font-size: var(--font-size-lg);
  font-weight: 600;
  text-decoration: none;
  color: var(--color-black);
}

.nav-brand a:hover {
  color: var(--color-gray-600);
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
  margin: 0;
  flex-wrap: wrap;
}

.nav-links li {
  margin: 0;
}

.nav-links a {
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-gray-600);
}

@media (max-width: 640px) {
  .site-nav .container {
    flex-direction: column;
    text-align: center;
  }

  .nav-links {
    justify-content: center;
    gap: var(--spacing-sm);
  }
}

/* ============================================
   6. FOOTER COMPONENT
   ============================================ */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-2xl);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.site-footer p {
  margin: 0;
}

/* ============================================
   7. REUSABLE COMPONENTS
   ============================================ */

/* Card Component */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--spacing-md);
  transition: border-color 0.2s ease;
}

.card:hover {
  border-color: var(--color-gray-300);
}

.card h2, .card h3 {
  margin-top: 0;
}

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

.section:not(:last-child) {
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  margin-bottom: var(--spacing-lg);
}

.section-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

/* Link List Component (Blog Index) */
.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.link-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-gray-200);
  margin: 0;
}

.link-list li:last-child {
  border-bottom: none;
}

.link-list a {
  display: block;
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: 500;
}

.link-list a:hover {
  color: var(--color-gray-600);
}

/* Testimonial/Quote Component */
.testimonial {
  border-left: 4px solid var(--color-black);
  padding-left: var(--spacing-md);
  margin: var(--spacing-md) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

/* Button/CTA Link */
.btn-link {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 2px solid var(--color-black);
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-link:hover {
  background: var(--color-black);
  color: var(--color-white);
}

/* Back Link */
.back-link {
  display: inline-block;
  margin-top: var(--spacing-lg);
  text-decoration: none;
  font-weight: 500;
}

.back-link::before {
  content: "← ";
}

/* ============================================
   8. PAGE-SPECIFIC STYLES
   ============================================ */

/* Homepage - Hero Section */
.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.hero p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

/* Homepage - Pillar Grid */
.pillar-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

@media (min-width: 640px) {
  .pillar-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pillar-card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

/* Page Header */
.page-header {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
}

.page-header h1 {
  margin: 0;
}

.page-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

/* Blog Post */
.blog-post {
  padding: var(--spacing-lg) 0;
}

.post-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.post-header h1 {
  margin-bottom: var(--spacing-xs);
}

.post-content {
  font-size: 18px;
  line-height: var(--line-height-loose);
}

.post-content p {
  margin-bottom: 1.5em;
}

.post-content h2 {
  margin-top: 2em;
  margin-bottom: 0.75em;
}

.post-content h3 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.post-footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

/* Resume - Grid Layout */
.resume-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

@media (min-width: 768px) {
  .resume-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.resume-section h3 {
  margin-top: 0;
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--color-black);
  margin-bottom: var(--spacing-md);
}

.resume-section ul {
  margin-left: 1.25rem;
}

.resume-section li {
  margin-bottom: 0.75em;
}

/* Resume Header */
.resume-header {
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-bottom: 2px solid var(--color-black);
  margin-bottom: var(--spacing-lg);
}

.resume-header h1 {
  margin-bottom: var(--spacing-xs);
}

.resume-tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: var(--spacing-xs);
}

.resume-subtitle {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-primary);
}

/* Value Proposition List */
.value-list {
  background: var(--color-gray-50);
  padding: var(--spacing-md);
  border-radius: 6px;
  margin: var(--spacing-lg) 0;
}

.value-list h3 {
  margin-top: 0;
}

/* Testimonials Section */
.testimonials {
  margin-top: var(--spacing-lg);
}

.testimonials .testimonial {
  margin-bottom: var(--spacing-md);
}

/* ============================================
   9. RESPONSIVE DESIGN
   ============================================ */

/* Tablet and above */
@media (min-width: 640px) {
  :root {
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
  }
}

/* Desktop and above */
@media (min-width: 768px) {
  .hero h1 {
    font-size: 3rem;
  }

  .container {
    padding: 0 var(--spacing-lg);
  }
}

/* ============================================
   10. PRINT STYLES
   ============================================ */

@media print {
  .site-nav,
  .site-footer,
  .back-link {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  h1 {
    font-size: 18pt;
  }

  h2 {
    font-size: 14pt;
  }

  h3 {
    font-size: 12pt;
  }

  .page-header,
  .post-header {
    border-bottom: 2px solid #000;
  }

  .card,
  .section {
    border: none;
    page-break-inside: avoid;
  }

  /* Ensure resume sections don't break across pages */
  .resume-section {
    page-break-inside: avoid;
  }
}

/* ============================================
   11. UTILITY CLASSES
   ============================================ */

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

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

.mt-lg {
  margin-top: var(--spacing-lg);
}

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

.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;
}