/* ========================================
   INK & SLATE DESIGN SYSTEM
   Warm stone neutrals, copper accents
   ======================================== */

:root {
  /* Typography */
  --font-display: 'Newsreader', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Warm Stone Neutrals */
  --stone-50:  #FAF8F6;
  --stone-100: #F5F0EB;
  --stone-200: #E8E0D8;
  --stone-300: #D4CBC0;
  --stone-400: #B5A99A;
  --stone-500: #8C8275;
  --stone-600: #6B6258;
  --stone-700: #4A443C;
  --stone-800: #2C2825;
  --stone-900: #1A1816;

  /* Copper Accent */
  --copper-300: #D4956A;
  --copper-400: #C47F4A;
  --copper-500: #B87333;
  --copper-600: #9A5F28;
  --copper-700: #7A4B1F;

  /* Status */
  --green-500: #4A7C47;
  --red-500: #B84C4C;
  --amber-500: #C9923E;

  /* Semantic Tokens */
  --bg: var(--stone-50);
  --bg-secondary: var(--stone-100);
  --bg-elevated: #FFFFFF;

  --text-primary: var(--stone-800);
  --text-secondary: var(--stone-600);
  --text-muted: var(--stone-500);

  --border: var(--stone-200);
  --border-strong: var(--stone-300);

  --accent: var(--copper-500);
  --accent-soft: var(--copper-300);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(44, 40, 37, 0.08);
  --shadow-md: 0 4px 12px rgba(44, 40, 37, 0.1);

  /* Motion */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ========================================
   BASE
   ======================================== */

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

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--duration-fast);
}

a:hover {
  color: var(--copper-600);
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.2;
}

/* ========================================
   LAYOUT
   ======================================== */

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================
   NAVIGATION
   ======================================== */

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}

.site-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  color: var(--text-primary);
}

.site-name:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  font-size: 15px;
  color: var(--text-secondary);
}

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

/* ========================================
   HERO
   ======================================== */

.hero {
  padding: 48px 0 64px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 400;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 19px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 600px;
}

/* ========================================
   TIMELINE
   ======================================== */

.timeline-section {
  padding: 32px 0 64px;
  overflow-x: auto;
}

.timeline {
  display: flex;
  align-items: flex-start;
  gap: 0;
  position: relative;
  min-width: max-content;
}

.timeline-track {
  position: absolute;
  top: 12px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--border);
  z-index: 0;
}

.timeline-week {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 120px;
  position: relative;
  z-index: 1;
}

.timeline-week::before {
  content: '';
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 2px solid var(--border-strong);
  transition: all var(--duration-fast);
}

.timeline-week.current::before {
  background: var(--accent);
  border-color: var(--accent);
  animation: timeline-pulse 2s ease-in-out infinite;
  box-shadow: 0 0 0 0 rgba(184, 115, 51, 0.4);
}

@keyframes timeline-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(184, 115, 51, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(184, 115, 51, 0);
  }
}

.timeline-week.killed::before {
  background: var(--stone-300);
  border-color: var(--stone-400);
}

.timeline-week.future::before {
  background: var(--bg);
  border-color: var(--border);
  border-style: dashed;
}

.week-num {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-top: 4px;
}

.week-product {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--text-primary);
}

.timeline-week.killed .week-product {
  text-decoration: line-through;
  color: var(--text-muted);
}

.week-status {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--red-500);
}

.week-indicator {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--stone-100);
  padding: 2px 8px;
  border-radius: 10px;
}

/* Timeline hover states */
.timeline-week {
  cursor: pointer;
  transition: transform var(--duration-fast);
}

.timeline-week:hover {
  transform: translateY(-2px);
}

.timeline-week:hover::before {
  transform: scale(1.1);
}

.timeline-week.killed:hover .week-product {
  text-decoration: none;
  color: var(--text-secondary);
}

.timeline-week:hover .week-num {
  color: var(--text-secondary);
}

/* Timeline link wrapper */
.timeline-week-link {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

/* Timeline week as link */
a.timeline-week {
  text-decoration: none;
  color: inherit;
}

/* ========================================
   SECTIONS
   ======================================== */

section {
  padding: 32px 0;
}

.section-title {
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* ========================================
   PROGRAM CARDS
   ======================================== */

.programs-grid {
  display: grid;
  gap: 16px;
}

.program-card {
  display: block;
  padding: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all var(--duration-normal) var(--ease);
}

.program-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.program-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
}

.program-name {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--text-primary);
}

.program-type {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.program-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.program-status {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.program-status strong {
  color: var(--text-primary);
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--green-500);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ========================================
   RHYTHM
   ======================================== */

.rhythm {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.rhythm-step {
  flex: 1;
  text-align: center;
  padding: 16px;
}

.rhythm-day {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 8px;
}

.rhythm-action {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--text-primary);
}

.rhythm-arrow {
  color: var(--border-strong);
  font-size: 20px;
  flex-shrink: 0;
}

/* ========================================
   LESSONS / INSIGHTS
   ======================================== */

.lessons-grid {
  display: grid;
  gap: 16px;
}

.lesson-card {
  padding: 20px 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  transition: all var(--duration-normal) var(--ease);
}

.lesson-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.lesson-source {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.lesson-source .week-badge {
  background: var(--stone-200);
  padding: 2px 6px;
  border-radius: 3px;
}

.lesson-content {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.lesson-content strong {
  color: var(--text-primary);
}

.lessons-link {
  display: inline-block;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  transition: color var(--duration-fast);
}

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

/* ========================================
   CODE EXAMPLES
   ======================================== */

.code-example {
  background: var(--stone-800);
  border-radius: 8px;
  overflow: hidden;
  margin: 24px 0;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--stone-900);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.code-filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--stone-400);
}

.code-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--copper-400);
  background: rgba(184, 115, 51, 0.15);
  padding: 3px 8px;
  border-radius: 4px;
}

.code-content {
  padding: 16px;
  overflow-x: auto;
}

.code-content pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone-200);
}

.code-content .comment {
  color: var(--stone-500);
}

.code-content .keyword {
  color: var(--copper-400);
}

.code-content .string {
  color: var(--green-500);
}

/* ========================================
   PROJECT THUMBNAILS
   ======================================== */

.project-card-thumb {
  width: 100%;
  height: 120px;
  background: var(--stone-100);
  border-radius: 6px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.project-card-thumb .thumb-placeholder {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   COLLAPSIBLE SECTIONS
   ======================================== */

.collapsible-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  padding: 8px 0;
  margin-bottom: 8px;
  user-select: none;
}

.collapsible-header:hover h2 {
  color: var(--accent);
}

.collapse-icon {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform var(--duration-fast);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.collapsible-content.open {
  max-height: 5000px;
}

.collapsible-header.open .collapse-icon {
  transform: rotate(180deg);
}

/* ========================================
   FOOTER
   ======================================== */

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 0;
  margin-top: 48px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent);
}

/* ========================================
   PROGRAM PAGE
   ======================================== */

.page-header {
  padding: 32px 0 48px;
}

.page-header h1 {
  font-size: 40px;
  margin-bottom: 16px;
}

.page-intro {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
}

.content-block {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.content-block h2 {
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.content-block p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ========================================
   PROJECT CARDS (for program page)
   ======================================== */

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.project-card {
  display: block;
  padding: 20px 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all var(--duration-normal) var(--ease);
}

.project-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.project-card.featured {
  border-left: 3px solid var(--accent);
}

.project-card.killed {
  opacity: 0.7;
}

.project-card.killed:hover {
  opacity: 1;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.project-name {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--text-primary);
}

.project-status {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 4px;
}

.project-status.active {
  background: rgba(74, 124, 71, 0.1);
  color: var(--green-500);
}

.project-status.killed {
  background: rgba(184, 76, 76, 0.1);
  color: var(--red-500);
}

.project-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.project-meta {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.project-lesson-teaser {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
  font-style: italic;
}

.project-lesson-teaser strong {
  color: var(--text-secondary);
  font-style: normal;
}

/* ========================================
   PROJECT DETAIL PAGE
   ======================================== */

.project-page-header {
  padding: 32px 0;
}

.project-page-header h1 {
  font-size: 36px;
  margin-bottom: 8px;
}

.project-oneliner {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.project-links {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}

.project-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all var(--duration-fast);
}

.project-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.tab {
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--duration-fast);
}

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

.tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Project content sections */
.project-section {
  margin-bottom: 40px;
}

.project-section h2 {
  font-family: var(--font-display);
  font-size: 22px;
  margin-bottom: 12px;
}

.project-section h3 {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 24px 0 12px;
}

.project-section p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.project-section ul,
.project-section ol {
  margin: 16px 0;
  padding-left: 24px;
  color: var(--text-secondary);
}

.project-section li {
  margin-bottom: 8px;
  line-height: 1.6;
}

/* Pricing tiers */
.pricing-tiers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.tier {
  padding: 20px;
  background: var(--bg-secondary);
  border-radius: 8px;
}

.tier-name {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.tier-price {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.tier-desc {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Friction log */
.friction-log-intro {
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.friction-stats {
  display: flex;
  gap: 24px;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-radius: 8px;
  margin-bottom: 32px;
}

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

.friction-stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--text-primary);
  line-height: 1.2;
}

.friction-stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.friction-stat-value.high-severity {
  color: var(--red-500);
}

.friction-entry {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.friction-entry:last-child {
  border-bottom: none;
}

.friction-time {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.friction-content {
  font-size: 15px;
  color: var(--text-secondary);
}

.friction-severity {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 3px;
  margin-left: 8px;
}

.friction-severity.high {
  background: rgba(184, 76, 76, 0.1);
  color: var(--red-500);
}

.friction-severity.medium {
  background: rgba(201, 146, 62, 0.1);
  color: var(--amber-500);
}

.friction-severity.low {
  background: rgba(74, 124, 71, 0.1);
  color: var(--green-500);
}

/* ========================================
   LOG PAGE
   ======================================== */

.log-intro {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.7;
}

.log-entries {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.log-entry {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.log-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.log-title {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.log-content {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.log-content p {
  margin-bottom: 16px;
}

.log-link {
  font-family: var(--font-mono);
  font-size: 13px;
  margin-top: 16px;
  display: inline-block;
}

/* ========================================
   ABOUT PAGE
   ======================================== */

.about-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.about-content p {
  margin-bottom: 24px;
}

.about-content strong {
  color: var(--text-primary);
  font-weight: 500;
}

.connect-links {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.connect-links a {
  font-family: var(--font-mono);
  font-size: 14px;
}

/* ========================================
   PLACEHOLDER
   ======================================== */

.placeholder {
  padding: 40px;
  background: var(--bg-secondary);
  border: 1px dashed var(--border-strong);
  border-radius: 8px;
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  .container {
    padding: 0 20px;
  }

  nav {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }

  .nav-links {
    gap: 16px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-sub {
    font-size: 17px;
  }

  .rhythm {
    flex-direction: column;
    gap: 0;
  }

  .rhythm-arrow {
    transform: rotate(90deg);
    padding: 8px 0;
  }

  .rhythm-step {
    padding: 12px;
  }

  .pricing-tiers {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tab {
    padding: 12px 16px;
    white-space: nowrap;
  }
}