/* --------------------------------------------------------------------------
   Bounce & Redirect — Core Stylesheet
   Subject: Email Infrastructure & Deliverability Mechanics
   -------------------------------------------------------------------------- */

:root {
  --color-primary: #12151a;
  --color-secondary: #5b6572;
  --color-accent: #9ede3a;
  --color-surface: #eef1f4;
  --color-ink: #0a0d11;
  --color-border: rgba(91, 101, 114, 0.25);
  --color-border-bright: rgba(158, 222, 58, 0.4);
  
  --font-display: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Geist Mono', 'SF Mono', Consolas, Monaco, monospace;
}

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

html {
  font-size: 16px;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background-color: var(--color-surface);
  color: var(--color-ink);
  overflow-x: hidden;
}

/* Base link styles */
a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-accent);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-primary);
  line-height: 1.15;
}

/* Outer Layout Frame */
.system-viewport {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

.system-content-column {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3rem 4rem 3rem;
  max-width: 1040px;
}

/* Header & Brand Mark - Top of Content Column */
.brand-masthead {
  margin-bottom: 2.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand-title-link {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-title-text {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-primary);
  text-transform: uppercase;
}

.brand-title-text span {
  color: var(--color-secondary);
  font-weight: 400;
}

.brand-subtitle-tag {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-secondary);
  background: rgba(18, 21, 26, 0.05);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Right Navigation Bar */
.navigation-sidebar {
  width: 260px;
  flex-shrink: 0;
  border-left: 1px solid var(--color-border);
  background: var(--color-primary);
  color: var(--color-surface);
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sidebar-sticky-wrapper {
  position: sticky;
  top: 2.5rem;
}

.sidebar-heading {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(91, 101, 114, 0.4);
}

.sidebar-nav-list {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem 0;
}

.sidebar-nav-item {
  margin-bottom: 0.75rem;
}

.sidebar-nav-link {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-surface);
  text-decoration: none;
  display: block;
  padding: 0.4rem 0.6rem;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
}

.sidebar-nav-link:hover,
.sidebar-nav-link.active {
  color: var(--color-accent);
  background: rgba(255, 255, 255, 0.05);
  border-left-color: var(--color-accent);
}

.sidebar-meta-block {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(91, 101, 114, 0.3);
  font-size: 0.75rem;
  color: var(--color-secondary);
}

.sidebar-meta-label {
  color: var(--color-accent);
  font-family: var(--font-body);
  font-weight: 600;
  display: block;
  margin-bottom: 0.25rem;
}

/* Homepage Intro Opening Stage */
.intro-stage {
  position: relative;
  margin-top: 1.5rem;
  margin-bottom: 4rem;
}

.intro-layer-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-ink);
  line-height: 0.95;
  position: relative;
  z-index: 2;
  transform: translateY(1.2rem);
  margin-left: -0.25rem;
  text-transform: uppercase;
}

.intro-layer-title span {
  color: var(--color-secondary);
}

.intro-layer-panel {
  background: var(--color-primary);
  color: var(--color-surface);
  border: 1px solid var(--color-primary);
  border-left: 4px solid var(--color-accent);
  padding: 3rem 2.25rem 2.25rem 2.25rem;
  position: relative;
  z-index: 1;
}

.intro-layer-panel p {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  color: #d1d6dc;
  margin-bottom: 1.25rem;
}

.intro-layer-panel p:last-child {
  margin-bottom: 0;
}

/* Real section pitch highlights grid within intro */
.pitch-triad {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(91, 101, 114, 0.4);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.pitch-unit {
  background: rgba(10, 13, 17, 0.6);
  padding: 1rem;
  border: 1px solid rgba(91, 101, 114, 0.3);
}

.pitch-unit-name {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.pitch-unit-desc {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: #a0aab6;
  line-height: 1.45;
  margin-bottom: 0 !important;
}

/* Explicit List Rule for Both Prose & Intro Containers (Mandatory Requirement) */
.intro-layer-panel ul,
.intro-layer-panel ol,
.article-prose ul,
.article-prose ol,
.page-prose ul,
.page-prose ol {
  padding-left: 1.75rem;
  margin-top: 1rem;
  margin-bottom: 1.5rem;
}

.intro-layer-panel li,
.article-prose li,
.page-prose li {
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

.intro-layer-panel li::marker {
  color: var(--color-accent);
}

/* Section Header */
.section-headline-bar {
  margin-bottom: 2.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--color-primary);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.section-headline-title {
  font-size: 1.5rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.section-headline-count {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-secondary);
}

/* Vertical Timeline Article System */
.chronicle-stream {
  position: relative;
  padding: 1.5rem 0;
  margin-bottom: 3rem;
}

.chronicle-stream::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--color-border);
  transform: translateX(-50%);
}

.chronicle-node {
  position: relative;
  width: 45%;
  margin-bottom: 3.5rem;
}

.chronicle-node:last-child {
  margin-bottom: 1rem;
}

/* Odd nodes left side */
.chronicle-node:nth-child(odd) {
  margin-left: 0;
  margin-right: auto;
  text-align: right;
  padding-right: 2rem;
}

/* Even nodes right side */
.chronicle-node:nth-child(even) {
  margin-left: auto;
  margin-right: 0;
  text-align: left;
  padding-left: 2rem;
}

/* Node marker on central line */
.chronicle-marker {
  position: absolute;
  top: 0.35rem;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border: 3px solid var(--color-primary);
  border-radius: 50%;
  z-index: 3;
}

.chronicle-node:nth-child(odd) .chronicle-marker {
  right: -2rem;
  transform: translateX(50%);
}

.chronicle-node:nth-child(even) .chronicle-marker {
  left: -2rem;
  transform: translateX(-50%);
}

.chronicle-date {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  display: block;
}

.chronicle-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.chronicle-title a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.chronicle-title a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.chronicle-summary {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-secondary);
  line-height: 1.55;
}

/* Single Article & Page Layout */
.article-header,
.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-secondary);
  margin-bottom: 1rem;
}

.article-category-tag {
  background: var(--color-primary);
  color: var(--color-accent);
  padding: 0.2rem 0.5rem;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article-main-title,
.page-main-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
  line-height: 1.1;
}

.article-lead,
.page-lead {
  font-family: var(--font-body);
  font-size: 1.15rem;
  color: var(--color-secondary);
  line-height: 1.6;
  max-width: 820px;
}

/* Article Body Content */
.article-prose,
.page-prose {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-ink);
  max-width: 820px;
}

.article-prose p,
.page-prose p {
  margin-bottom: 1.5rem;
}

.article-prose h2,
.page-prose h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
}

.article-prose h3,
.page-prose h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-prose blockquote,
.page-prose blockquote {
  margin: 1.75rem 0;
  padding: 1rem 1.5rem;
  background: rgba(18, 21, 26, 0.04);
  border-left: 3px solid var(--color-primary);
  font-style: normal;
  color: var(--color-primary);
}

.article-prose code,
.page-prose code {
  font-family: var(--font-body);
  font-size: 0.9em;
  background: rgba(18, 21, 26, 0.08);
  padding: 0.15rem 0.4rem;
  border-radius: 2px;
}

.article-prose pre,
.page-prose pre {
  background: var(--color-primary);
  color: var(--color-surface);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.75rem 0;
  border-left: 3px solid var(--color-accent);
}

.article-prose pre code,
.page-prose pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.article-prose hr,
.page-prose hr {
  border: 0;
  height: 1px;
  background: var(--color-border);
  margin: 2.5rem 0;
}

/* Table styling */
.article-prose table,
.page-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.9rem;
}

.article-prose th,
.page-prose th {
  background: var(--color-primary);
  color: var(--color-surface);
  text-align: left;
  padding: 0.6rem 0.8rem;
  font-family: var(--font-display);
}

.article-prose td,
.page-prose td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--color-border);
}

/* Site Footer */
.site-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-nav {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  padding: 0;
}

.footer-nav a {
  color: var(--color-secondary);
  text-decoration: none;
}

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

/* --------------------------------------------------------------------------
   Responsive Design & 375px Mobile Viewport Safety
   -------------------------------------------------------------------------- */

@media (max-width: 900px) {
  .pitch-triad {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .system-viewport {
    flex-direction: column;
  }
  
  .system-content-column {
    padding: 1.5rem 1.25rem 3rem 1.25rem;
    max-width: 100%;
  }

  .navigation-sidebar {
    width: 100%;
    border-left: none;
    border-top: 2px solid var(--color-accent);
    padding: 1.5rem 1.25rem;
    order: 2; /* Move below content on mobile, keeping header top left */
  }

  .sidebar-sticky-wrapper {
    position: static;
  }

  .sidebar-nav-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
  }

  .sidebar-nav-item {
    margin-bottom: 0;
  }

  .sidebar-nav-link {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 0.3rem 0.6rem;
    background: rgba(255, 255, 255, 0.05);
  }

  .sidebar-nav-link:hover,
  .sidebar-nav-link.active {
    border-left-color: transparent;
    border-bottom-color: var(--color-accent);
  }

  .intro-layer-title {
    font-size: 2.2rem;
    transform: translateY(0.8rem);
  }

  .intro-layer-panel {
    padding: 2rem 1.25rem 1.5rem 1.25rem;
  }

  /* Responsive Timeline */
  .chronicle-stream::before {
    left: 12px;
    transform: none;
  }

  .chronicle-node {
    width: 100% !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    text-align: left !important;
    padding-left: 2rem !important;
    padding-right: 0 !important;
    margin-bottom: 2.5rem;
  }

  .chronicle-node:nth-child(odd) .chronicle-marker,
  .chronicle-node:nth-child(even) .chronicle-marker {
    left: 6px !important;
    right: auto !important;
    transform: translateX(0) !important;
  }
}