/* ===================================
   Technical Minimalism Design System
   CodeGood - 2024
   =================================== */

/* Design Tokens */
:root {
  /* Color System - Monochromatic Base */
  --color-bg: #FAFAFA;
  --color-surface: #FFFFFF;
  --color-text-primary: #0A0A0A;
  --color-text-secondary: #525252;
  --color-border: #E5E5E5;
  --color-border-strong: #171717;

  /* Accent Colors - Semantic */
  --color-accent-primary: #18181B;
  --color-accent-code: #16A34A;
  --color-accent-link: #0066CC;
  --color-accent-warning: #DC2626;

  /* Typography */
  --font-sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  /* Spacing - 8px Grid */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-12: 6rem;
}

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg);
  min-height: 100vh;
}

/* Typography */
h1 {
  font-size: 3rem;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

h2 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

p {
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

a {
  color: var(--color-accent-link);
  text-decoration: none;
  transition: color 150ms ease-out;
}

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

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

/* Layout Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
}

/* Header */
header {
  margin-bottom: var(--space-12);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.brand {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.availability {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

/* Navigation */
.nav {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 150ms ease-out;
}

.nav a:hover {
  color: var(--color-text-primary);
}

.nav-current {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* Homepage Hero */
.homepage-hero {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-border-strong);
}

.homepage-hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-2);
}

.homepage-tagline {
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin-bottom: 0;
}

/* Writing Section (homepage) */
.writing-section {
  margin-bottom: var(--space-8);
}

/* Hero Section */
.hero {
  margin-bottom: var(--space-12);
}

.hero-content {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
}

.hero-text {
  flex: 1;
}

.hero-image {
  flex-shrink: 0;
  width: 200px;
  height: 200px;
  border: 2px solid var(--color-border-strong);
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-surface);
}

.hero-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tagline {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.description {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 800px;
}

/* Who Section */
.who {
  margin-bottom: var(--space-12);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 2px solid var(--color-border-strong);
}

.who h2 {
  margin-bottom: var(--space-4);
}

.who-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  max-width: 900px;
}

.who-description:last-child {
  margin-bottom: 0;
}

/* Services Section */
.services {
  margin-bottom: var(--space-12);
  border-top: 2px solid var(--color-border-strong);
  padding-top: var(--space-6);
}

.service {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border);
  transition: transform 150ms ease-out, border-color 150ms ease-out;
}

.service:hover {
  transform: scale(1.01);
  border-color: var(--color-border-strong);
}

.service-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.service h3 {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-3);
}

.service-content {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.service-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.service-detail {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-2);
}

.service-label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.service-value {
  font-size: 1rem;
  color: var(--color-text-primary);
  line-height: 1.6;
}

.service-pricing {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

.pricing-label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.pricing-value {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

/* Trusted By Section */
.trusted-by {
  margin-bottom: var(--space-12);
  padding: var(--space-6) 0;
  border-top: 2px solid var(--color-border-strong);
}

.trusted-by h2 {
  margin-bottom: var(--space-6);
}

.trusted-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  max-width: 900px;
}

.trusted-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: border-color 150ms ease-out;
}

.trusted-item:hover {
  border-color: var(--color-border-strong);
}

.trusted-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.trusted-name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

/* Testimonials Section */
.testimonials {
  margin-bottom: var(--space-12);
  padding: var(--space-6) 0;
  border-top: 2px solid var(--color-border-strong);
}

.testimonials h2 {
  margin-bottom: var(--space-6);
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.testimonial {
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: border-color 150ms ease-out;
}

.testimonial:hover {
  border-color: var(--color-border-strong);
}

.testimonial-quote {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.testimonial-attribution {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Why Not Section */
.why-not {
  margin-bottom: var(--space-12);
  padding: var(--space-6) 0;
  border-top: 2px solid var(--color-border-strong);
}

.why-not h2 {
  margin-bottom: var(--space-6);
}

.why-not-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.why-not-item {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  transition: transform 150ms ease-out, border-color 150ms ease-out;
}

.why-not-item:hover {
  transform: scale(1.02);
  border-color: var(--color-border-strong);
}

.why-not-item h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.why-not-item p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Contact Section */
.contact {
  padding: var(--space-6) 0;
  border-top: 2px solid var(--color-border-strong);
}

.contact h2 {
  margin-bottom: var(--space-4);
}

.contact-info {
  display: grid;
  gap: var(--space-2);
  max-width: 600px;
}

.contact-info p {
  font-size: 1.125rem;
  color: var(--color-text-primary);
}

.contact-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.contact-email {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-accent-link);
  margin: var(--space-3) 0;
}

.contact-note {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Writing Section */
.writing {
  margin-bottom: var(--space-12);
  padding: var(--space-6) 0;
  border-top: 2px solid var(--color-border-strong);
}

.writing h2 {
  margin-bottom: 0;
}

.writing-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-6);
}

.rss-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 150ms ease-out;
  white-space: nowrap;
}

.rss-link:hover {
  color: var(--color-accent-link);
}

.rss-badge {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  margin-right: 0.25rem;
}

/* Newsletter Subscription Section - Mobile First */
.subscription-section {
  background: var(--color-surface);
  border: 2px solid var(--color-border-strong);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.newsletter-form {
  flex: 1;
}

.subscription-heading {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.subscription-description {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.subscribe-link-button {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.875rem 2rem;
  background: var(--color-accent-primary);
  color: #FFFFFF;
  border: 2px solid var(--color-accent-primary);
  text-decoration: none;
  transition: all 150ms ease-out;
  min-height: 48px;
  line-height: 1.5;
  text-align: center;
}

.subscribe-link-button:hover {
  background: var(--color-text-primary);
  border-color: var(--color-text-primary);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.subscribe-link-button:active {
  transform: translateY(0);
}

.subscribe-link-button:focus {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

.subscription-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-3);
  margin-bottom: 0;
  letter-spacing: 0.02em;
}

/* RSS Option Section */
.rss-option {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: flex-start;
}

.rss-label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

/* Desktop Layout - Side by Side */
@media (min-width: 768px) {
  .subscription-section {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-8);
  }

  .newsletter-form {
    flex: 2;
  }

  .rss-option {
    flex: 1;
    border-top: none;
    border-left: 1px solid var(--color-border);
    padding-top: 0;
    padding-left: var(--space-6);
    justify-content: center;
  }

  .rss-option .rss-link {
    min-height: 48px; /* Match button height for visual balance */
    display: flex;
    align-items: center;
  }
}

.writing-grid {
  display: grid;
  gap: var(--space-6);
}

.article-preview {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  transition: border-color 150ms ease-out, transform 150ms ease-out;
  text-decoration: none;
  display: block;
}

.article-preview:hover {
  border-color: var(--color-border-strong);
  transform: scale(1.01);
}

.article-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  letter-spacing: 0.05em;
}

.article-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  letter-spacing: 0.1em;
}

.article-title {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.article-excerpt {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* Article Page */
.article {
  max-width: 800px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-border-strong);
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.article h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: var(--space-2);
}

.article-content {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-text-primary);
}

.article-content h2 {
  font-size: 1.75rem;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.article-content h3 {
  font-size: 1.25rem;
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

.article-content p {
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-3);
  padding-left: var(--space-4);
}

.article-content li {
  margin-bottom: var(--space-2);
  line-height: 1.8;
  color: var(--color-text-primary);
}

.article-content strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-bg);
  padding: 0.2em 0.4em;
  border: 1px solid var(--color-border);
}

.article-footer {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 2px solid var(--color-border-strong);
}

/* Article Subscription CTA */
.article-subscribe {
  background: var(--color-surface);
  border: 2px solid var(--color-border-strong);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  text-align: center;
}

.article-subscribe .subscribe-heading {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.article-subscribe .subscribe-description {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.subscribe-options {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.subscribe-divider {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.subscribe-rss-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 150ms ease-out;
}

.subscribe-rss-link:hover {
  color: var(--color-accent-link);
}

@media (min-width: 640px) {
  .subscribe-options {
    flex-direction: row;
    justify-content: center;
  }
}

.article-cta {
  font-size: 1.125rem;
  line-height: 1.7;
}

.article-cta p {
  margin-bottom: var(--space-2);
}

/* Footer */
.footer {
  margin-top: var(--space-8);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.footer-rss {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  letter-spacing: 0.1em;
}

.footer-rss:hover {
  color: var(--color-accent-link);
}

/* Mobile CTA - Hidden on Desktop */
.mobile-cta {
  display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --space-12: 4rem;
    --space-8: 3rem;
  }

  .container {
    padding: var(--space-6) var(--space-3);
    padding-bottom: 100px; /* Make room for floating CTA */
  }

  /* Mobile floating CTA */
  .mobile-cta {
    display: block;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    background: var(--color-accent-primary);
    color: #FFFFFF;
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: 4px;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    transition: transform 150ms ease-out, box-shadow 150ms ease-out;
  }

  .mobile-cta:hover {
    color: #FFFFFF;
    transform: translateX(-50%) translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  }

  header {
    flex-direction: column;
    align-items: flex-start;
  }

  .availability {
    font-size: 0.7rem;
  }

  .availability a {
    display: block;
    margin-bottom: 0.5rem;
  }

  /* Simplify services on mobile - hide detailed examples */
  .service-detail {
    display: none;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .description {
    font-size: 1.125rem;
  }

  .who {
    padding: var(--space-4);
  }

  .who-description {
    font-size: 1rem;
  }

  .hero-content {
    flex-direction: column;
    align-items: center;
  }

  .hero-image {
    width: 150px;
    height: 150px;
    order: -1;
  }

  .service-detail {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .service-pricing {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

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

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

  .why-not-grid {
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }

  .article h1 {
    font-size: 1.75rem;
  }

  .article-content {
    font-size: 1rem;
  }

  .article-content h2 {
    font-size: 1.5rem;
  }

  .article-content h3 {
    font-size: 1.125rem;
  }
}