/* Base Styles */
@import url('variables.css');

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-neutral-800);
  background-color: var(--color-neutral-50);
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

section {
  padding: var(--space-8) 0;
}

/* Typography */
h1, h2, h3, h4 {
  margin-bottom: var(--space-3);
  line-height: var(--line-height-tight);
  color: var(--color-neutral-900);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: var(--font-size-4xl); text-align: center; margin-bottom: var(--space-6); }
h3 { font-size: var(--font-size-2xl); }

.highlight { color: var(--color-primary-600); }
.subtitle { 
  font-size: var(--font-size-xl); 
  color: var(--color-neutral-600); 
  max-width: 800px; 
  margin: 0 auto var(--space-6);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-7);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
}

.btn-lg { padding: 1rem 2rem; font-size: var(--font-size-lg); }
.btn-sm { padding: 0.5rem 1rem; font-size: var(--font-size-sm); }

.btn-primary { background: var(--color-primary-600); color: white; }
.btn-primary:hover { background: var(--color-primary-700); transform: translateY(-2px); }

.btn-secondary { background: var(--color-neutral-200); color: var(--color-neutral-800); }
.btn-secondary:hover { background: var(--color-neutral-300); }

.btn-outline { border-color: var(--color-primary-600); color: var(--color-primary-600); }
.btn-outline:hover { background: var(--color-primary-50); }

/* Header */
#main-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-neutral-200);
}

#main-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo { height: 40px; }

#main-nav ul {
  display: flex;
  list-style: none;
  align-items: center;
  gap: var(--space-5);
}

.nav-link {
  color: var(--color-neutral-700);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.nav-link:hover { color: var(--color-primary-600); }

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--space-10) 0;
  background: linear-gradient(to bottom, white, var(--color-neutral-50));
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
}

.project-card {
  background: white;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-neutral-200);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.project-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  color: white;
}

.project-icon svg { width: 32px; height: 32px; }

/* Project Specific Colors */
.vibe-coding { border-top: 4px solid var(--color-project-vibe-coding); }
.vibe-coding .project-icon { background: var(--color-project-vibe-coding); }

.vibe-learning { border-top: 4px solid var(--color-project-vibe-learning); }
.vibe-learning .project-icon { background: var(--color-project-vibe-learning); }

.vibe-guiding { border-top: 4px solid var(--color-project-vibe-guiding); }
.vibe-guiding .project-icon { background: var(--color-project-vibe-guiding); }

.ai4pkm { border-top: 4px solid var(--color-project-ai4pkm); }
.ai4pkm .project-icon { background: var(--color-project-ai4pkm); }

.seattle-ai { border-top: 4px solid var(--color-project-seattle-ai); }
.seattle-ai .project-icon { background: var(--color-project-seattle-ai); }

.ai-in-action { border-top: 4px solid var(--color-project-ai-in-action); }
.ai-in-action .project-icon { background: var(--color-project-ai-in-action); }

.project-link {
  margin-top: auto;
  font-weight: var(--font-weight-bold);
  color: var(--color-neutral-900);
  text-decoration: none;
  padding-top: var(--space-4);
}

/* Project Detail Specifics */
.project-detail .project-hero {
  padding: var(--space-10) 0;
  background: radial-gradient(circle at top right, rgba(var(--hero-rgb, 59, 130, 246), 0.15), transparent),
              linear-gradient(to bottom, white, var(--color-neutral-50));
  border-bottom: 1px solid var(--color-neutral-100);
  margin-bottom: var(--space-8);
}

.project-header-info {
  max-width: 800px;
}

.category-tag {
  display: inline-block;
  padding: 0.25rem 0.85rem;
  background: rgba(var(--hero-rgb, 59, 130, 246), 0.1);
  color: rgb(var(--hero-rgb, 59, 130, 246));
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-lead {
  font-size: var(--font-size-2xl);
  color: var(--color-neutral-600);
  line-height: var(--line-height-loose);
  margin-top: var(--space-4);
  font-weight: var(--font-weight-medium);
}

.content-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: var(--space-9);
  align-items: start;
}

.main-text h2 { text-align: left; margin-top: var(--space-6); border-bottom: 2px solid var(--color-neutral-100); padding-bottom: var(--space-2); }
.main-text h3 { margin-top: var(--space-6); color: var(--color-neutral-800); }
.main-text p { font-size: 1.1rem; color: var(--color-neutral-700); line-height: 1.8; margin-bottom: var(--space-4); }
.main-text ul { margin-bottom: var(--space-6); padding-left: var(--space-5); list-style-type: none; }
.main-text li { position: relative; margin-bottom: var(--space-3); font-size: 1.1rem; color: var(--color-neutral-700); padding-left: var(--space-4); }
.main-text li::before { content: "\2022"; position: absolute; left: 0; color: rgb(var(--hero-rgb, 59, 130, 246)); font-weight: bold; }

/* Decorative Boxes */
.demo-box, .quote-box, .info-card, .signup-box, .event-box, .cta-card {
  background: white;
  padding: var(--space-7);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-neutral-200);
  box-shadow: var(--shadow-md);
  margin: var(--space-8) 0;
  transition: all var(--transition-normal);
}

.demo-box:hover, .info-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }

.quote-box {
  border-left: 6px solid rgb(var(--hero-rgb, 59, 130, 246));
  font-style: italic;
  background: var(--color-neutral-50);
}

.quote-box p { font-size: 1.25rem; color: var(--color-neutral-800); line-height: 1.6; }

/* Project Media Sidebar */
.project-media {
  position: sticky;
  top: 100px;
  background: white;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-neutral-100);
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  background: var(--color-neutral-900);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.caption { font-size: var(--font-size-sm); color: var(--color-neutral-500); text-align: center; font-style: italic; }

/* Next Steps CTA */
.next-steps { padding: var(--space-9) 0; background: var(--color-neutral-100); }
.cta-card { background: var(--color-neutral-900); color: white; text-align: center; border: none; }
.cta-card h2 { color: white; margin-bottom: var(--space-3); }
.cta-card p { color: var(--color-neutral-400); margin-bottom: var(--space-6); }

/* RGB Hero Colors */
.vibe-coding { --hero-rgb: 37, 99, 235; }
.vibe-learning { --hero-rgb: 5, 150, 105; }
.vibe-guiding { --hero-rgb: 234, 88, 12; }
.ai4pkm { --hero-rgb: 139, 92, 246; }
.seattle-ai { --hero-rgb: 79, 70, 229; }
.ai-in-action { --hero-rgb: 249, 115, 22; }

/* Comments Section */
.comments-section {
  padding: var(--space-9) 0;
  background: white;
  border-top: 1px solid var(--color-neutral-100);
}

.comments-container {
  max-width: 900px;
  margin: 0 auto;
}

.utterances {
  max-width: 100% !important;
}

/* Support Section */
.support-card {
  background: var(--color-neutral-900);
  color: white;
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  text-align: center;
}

.support-card h2 { color: white; }
.support-card p { color: var(--color-neutral-400); margin-bottom: var(--space-6); }

.support-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
}

/* Newsletter Section */
.newsletter-section { background: var(--color-primary-50); }
.newsletter-content { text-align: center; max-width: 600px; margin: 0 auto; }

.newsletter-form {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.newsletter-form input {
  flex: 1;
  padding: 1rem;
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-lg);
}

.newsletter-msg {
  margin-top: 1rem;
  font-size: 0.95rem;
  min-height: 1.4em;
}

.newsletter-msg--success {
  color: #16a34a;
}

.newsletter-msg--error {
  color: #dc2626;
}

.newsletter-msg--info {
  color: #2563eb;
}

/* Footer */
footer {
  background: var(--color-neutral-900);
  color: white;
  padding: var(--space-9) 0 var(--space-4);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-logo { height: 40px; margin-bottom: var(--space-4); }
.footer-links h4, .footer-social h4 { margin-bottom: var(--space-4); color: white; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: var(--space-2); }
.footer-links a { color: var(--color-neutral-400); text-decoration: none; }
.footer-links a:hover { color: white; }

.social-icons a { color: white; width: 32px; height: 32px; display: inline-block; }

.footer-bottom {
  border-top: 1px solid var(--color-neutral-800);
  padding-top: var(--space-4);
  text-align: center;
  color: var(--color-neutral-500);
  font-size: var(--font-size-sm);
}

/* Responsive */
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .cta-buttons { flex-direction: column; }
  .newsletter-form { flex-direction: column; }
  #main-nav { display: none; } /* Mobile menu implementation needed */
}

/* Mobile Navigation */
@media (max-width: 768px) {
  #mobile-menu-btn {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 101;
  }
  
  #mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--color-neutral-800);
    margin: 5px 0;
    transition: 0.3s;
  }

  #main-nav ul {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: white;
    flex-direction: column;
    justify-content: center;
    transition: 0.5s;
    box-shadow: -10px 0 30px rgba(0,0,0,0.1);
    z-index: 100;
  }

  #main-nav.mobile-open ul {
    right: 0;
  }
}

/* Animations Hub */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease-out, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Articles Table */
.articles-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-4);
  font-size: 0.95rem;
}

.articles-table thead tr {
  background: var(--color-bg-secondary);
  border-bottom: 2px solid var(--color-border);
}

.articles-table th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.articles-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background 0.15s;
}

.articles-table tbody tr:hover {
  background: var(--color-bg-secondary);
}

.articles-table td {
  padding: var(--space-3) var(--space-4);
  vertical-align: middle;
}

.articles-table td.article-date {
  white-space: nowrap;
  color: var(--color-text-muted);
  font-family: monospace;
  font-size: 0.85rem;
  width: 110px;
}

.articles-table td.article-title {
  color: var(--color-text-primary);
  font-weight: 500;
  line-height: 1.5;
}

.articles-table td:last-child {
  text-align: right;
  white-space: nowrap;
  width: 90px;
}

@media (max-width: 600px) {
  .articles-table td.article-date {
    display: none;
  }
  .articles-table th:first-child {
    display: none;
  }
}

/* Articles Page */
.articles-hero {
  padding: var(--space-8) 0 var(--space-6);
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  border-bottom: 1px solid var(--color-border);
}

.articles-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.articles-hero .substack-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: #FF6719;
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
  text-decoration: none;
}

.articles-hero .substack-badge:hover {
  background: #e55c15;
}

.articles-section-content {
  padding: var(--space-8) 0;
}

.article-list {
  border-top: 2px solid var(--color-border);
  margin-top: var(--space-4);
}

.article-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  transition: background 0.2s;
}

.article-item:hover {
  background: var(--color-bg-secondary);
  margin: 0 calc(-1 * var(--space-3));
  padding-left: var(--space-3);
  padding-right: var(--space-3);
  border-radius: var(--radius-md);
}

.article-date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  min-width: 90px;
  font-family: monospace;
}

.article-title {
  flex: 1;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-primary);
  line-height: 1.4;
}

.article-item .btn-sm {
  white-space: nowrap;
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .article-item {
    flex-wrap: wrap;
    gap: var(--space-2);
  }
  .article-date {
    min-width: auto;
  }
  .article-title {
    flex-basis: 100%;
  }
}