/* ==========================================================================
   Brandon Galang | Minimalist Systems & Writing Hub (Eugene Yan Styling)
   ========================================================================== */

:root {
  --c-text: #333333;
  --c-background: #FFFFFF;
  --c-interactive: #007bff;
  --c-interactive-hover: #0056b3;
  --c-subtext: #6c757d;
  --c-subtle: #868e96;
  --c-border: #e9ecef;
  --c-tag-bg: #e9ecef;
  --c-tag-text: #495057;
  --c-callout: #e6f2ff;

  --font-serif: "Merriweather", Georgia, Times, serif;
  --font-sans: "Raleway", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --container-max: 760px;
}

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

html {
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  background-color: var(--c-background);
  color: var(--c-text);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 300;
  color: var(--c-text);
  background-color: var(--c-background);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Accessible Focus Ring */
:focus-visible {
  outline: 2px solid var(--c-interactive);
  outline-offset: 2px;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--c-interactive);
  color: #ffffff;
  padding: 8px 14px;
  border-radius: 4px;
  z-index: 1000;
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 20px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Typography & Base Links */
a {
  color: var(--c-interactive);
  text-decoration: none;
  background-color: transparent;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--c-interactive-hover);
  text-decoration: underline;
}

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.3;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--c-text);
  background-color: #f8f9fa;
  padding: 2px 4px;
  border-radius: 3px;
}

.section-divider {
  border: 0;
  border-top: 1px solid var(--c-border);
  margin: 2.25rem 0;
}

/* Container */
.theme-container {
  width: 100%;
}

.site-container {
  width: 92%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 28px 0 60px 0;
}

/* Header & Nav */
.header {
  margin-bottom: 2rem;
  padding-bottom: 0.5rem;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 16px;
}

.brand-title {
  font-size: 1.45rem;
  font-weight: 700;
}

.brand-title a {
  color: var(--c-subtext);
  text-decoration: none;
}

.brand-title a:hover {
  color: var(--c-text);
  text-decoration: none;
}

.header-nav {
  font-family: var(--font-sans);
}

.nav-pills {
  display: flex;
  list-style: none;
  gap: 16px;
  align-items: baseline;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-pills a {
  color: var(--c-subtext);
  padding: 4px 0;
}

.nav-pills a:hover {
  color: var(--c-text);
  text-decoration: none;
}

.nav-office-hours-link {
  color: var(--c-interactive) !important;
  font-weight: 600;
}

.nav-subscribe-link {
  color: var(--c-interactive) !important;
  font-weight: 600;
}

/* Hero Section */
.hero-intro {
  margin-bottom: 1.5rem;
}

.hero-greeting {
  font-size: 1.65rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.35;
}

#hi span {
  transition: opacity 0.45s ease;
  color: var(--c-interactive);
}

#hi span.fade-out {
  opacity: 0;
}

.hero-summary {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text);
  margin-bottom: 1rem;
}

.hero-bullets {
  padding-left: 1.25rem;
  margin-bottom: 1.5rem;
}

.hero-bullets li {
  margin-bottom: 0.65rem;
  line-height: 1.65;
}

/* Prominent Office Hours Banner on Homepage */
.office-hours-hero-card {
  background: #f8faff;
  border: 1px solid #cce5ff;
  border-left: 4px solid var(--c-interactive);
  border-radius: 6px;
  padding: 20px 22px;
  margin: 0.25rem 0;
}

.oh-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.tag--active {
  background-color: var(--c-interactive) !important;
  color: #ffffff !important;
}

.oh-curation-pill {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--c-subtext);
}

.oh-card-title {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.oh-card-title a {
  color: var(--c-text);
  text-decoration: none;
}

.oh-card-title a:hover {
  color: var(--c-interactive);
}

.oh-card-desc {
  font-size: 0.92rem;
  line-height: 1.6;
  color: #495057;
  margin-bottom: 12px;
}

.oh-card-action {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.oh-btn {
  display: inline-block;
  text-decoration: none;
  font-size: 0.88rem;
  padding: 8px 16px;
}

.oh-btn:hover {
  text-decoration: none;
  color: #ffffff;
}

.oh-note {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--c-subtext);
}

/* Inline Subscribe Form */
.subscribe-container {
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.subscribe-form {
  display: flex;
  gap: 8px;
  max-width: 480px;
}

.subscribe-form input[type="email"] {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 9px 12px;
  min-height: 40px;
  border: 1px solid var(--c-border);
  border-radius: 4px;
  outline: none;
  background: #ffffff;
  color: var(--c-text);
  transition: border-color 0.15s ease;
}

.subscribe-form input[type="email"]:focus {
  border-color: var(--c-interactive);
}

.btn-subscribe {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 18px;
  min-height: 40px;
  background-color: var(--c-interactive);
  color: #ffffff;
  border: 1px solid var(--c-interactive);
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.btn-subscribe:hover {
  background-color: var(--c-interactive-hover);
}

.btn-subscribe:active {
  transform: translateY(1px);
}

.btn-subscribe:disabled {
  background-color: #ced4da !important;
  border-color: #ced4da !important;
  color: #6c757d !important;
  cursor: not-allowed !important;
  opacity: 0.7;
  transform: none !important;
}

.subscribe-feedback {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  margin-top: 6px;
  color: var(--c-subtext);
}

.subscribe-feedback--success {
  color: #28a745;
}

.subscribe-feedback--success a {
  color: inherit;
  text-decoration: underline;
}

.subscribe-feedback--error {
  color: #dc3545;
}

/* Page Section Titles */
.page-title {
  margin-bottom: 1.25rem;
}

.page-title h2 {
  font-size: 1.35rem;
  font-weight: 700;
}

.page-title h2 a {
  color: var(--c-text);
  text-decoration: none;
}

.page-title h2 a:hover {
  color: var(--c-interactive);
}

/* Featured Longform Cards */
.featured-cards-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 1rem;
}

.featured-art-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-thumb {
  display: block;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--c-border);
  aspect-ratio: 16 / 10;
  background-color: #f8f9fa;
}

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

.card-headline {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
  margin-top: 4px;
}

.card-headline a {
  color: var(--c-text);
}

.card-headline a:hover {
  color: var(--c-interactive);
}

.card-byline {
  font-size: 0.85rem;
  color: var(--c-subtext);
  margin-bottom: 0;
}

/* Native X Tweet Cards Grid */
.x-tweets-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 1.25rem;
}

.x-tweet-card {
  background-color: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.x-tweet-card:hover {
  border-color: #ced4da;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.x-tweet-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.x-avatar {
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--c-border);
}

.x-author-meta {
  flex: 1;
  min-width: 0;
}

.x-name-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
  line-height: 1.2;
}

.x-display-name {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-text);
}

.x-handle {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--c-subtext);
}

.x-topic-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background-color: #f1f3f5;
  color: #495057;
  padding: 1px 6px;
  border-radius: 3px;
  margin-top: 4px;
}

.x-logo-link {
  color: var(--c-subtext);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 4px;
  transition: color 0.15s ease;
}

.x-logo-link:hover {
  color: #000000;
  text-decoration: none;
}

.x-tweet-body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #0f1419;
  margin-bottom: 12px;
}

.x-tweet-body p {
  margin-bottom: 0.6rem;
}

.x-tweet-body p:last-child {
  margin-bottom: 0;
}

.x-tweet-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 10px;
  border-top: 1px solid #f1f3f5;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  color: var(--c-subtext);
}

.x-stat-item {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--c-subtext);
  text-decoration: none;
  transition: color 0.15s ease;
}

.x-stat-item:hover {
  color: var(--c-interactive);
  text-decoration: none;
}

/* Category Filter Tags */
.tag-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1.25rem;
  font-family: var(--font-sans);
}

.tag-filter-btn {
  background: var(--c-tag-bg);
  color: var(--c-tag-text);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  min-height: 28px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tag-filter-btn:hover {
  background-color: #dee2e6;
  color: #212529;
}

.tag-filter-btn.is-active {
  background-color: var(--c-interactive);
  color: #ffffff;
}

/* Eugene Yan Chronological Bullets */
.home-bullets-posts {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem 0;
}

.home-bullets-posts li {
  margin-bottom: 0.6rem;
}

.post-item {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.6;
}

.post-item a {
  color: var(--c-interactive);
}

.post-item a:hover {
  color: var(--c-interactive-hover);
}

.tag {
  background-color: var(--c-tag-bg);
  color: var(--c-tag-text);
  font-size: 0.72em;
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 2px 6px;
  border-radius: 3px;
  margin-left: 6px;
  vertical-align: middle;
}

.archive-more-row {
  margin-top: 1rem;
}

.btn-more {
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-interactive);
  cursor: pointer;
  padding: 6px 0;
  min-height: 36px;
}

.btn-more:hover {
  text-decoration: underline;
}

/* Systems & Workbenches */
.systems-cards-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.system-item {
  background-color: #fafbfc;
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: 16px;
}

.system-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 8px 0 6px 0;
}

.system-title a {
  color: var(--c-text);
}

.system-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #495057;
  margin-bottom: 10px;
}

.system-link {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--c-interactive);
  display: inline-block;
  padding: 2px 0;
}

/* About Section */
.about-text p {
  font-size: 1rem;
  line-height: 1.75;
}

/* Footer */
.footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-border);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--c-subtext);
}

.footer-links {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--c-subtext);
  padding: 4px 2px;
}

.footer-links a:hover {
  color: var(--c-text);
  text-decoration: underline;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--c-subtle);
  margin-bottom: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .site-container {
    width: 90%;
    padding: 20px 0 40px 0;
  }

  .header-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .nav-pills {
    flex-wrap: wrap;
    gap: 12px;
  }

  .hero-greeting {
    font-size: 1.45rem;
  }

  .featured-cards-row {
    grid-template-columns: 1fr;
  }

  .x-tweets-grid {
    grid-template-columns: 1fr;
  }

  .systems-cards-row {
    grid-template-columns: 1fr;
  }

  .subscribe-form {
    flex-direction: column;
  }

  .subscribe-form input[type="email"],
  .btn-subscribe {
    min-height: 44px;
  }
}