/* =========================================================
   The Scratcher Project — Stylesheet
   Mobile-first, plain CSS, no frameworks
   ========================================================= */

/* ----- Custom Properties ----- */
:root {
  --color-bg:        #0f0f0f;
  --color-surface:   #1a1a1a;
  --color-surface2:  #141414;
  --color-border:    #272727;
  --color-text:      #e8e8e8;
  --color-muted:     #888;
  --color-faint:     #555;
  --color-accent:    #f0e040;   /* scratch-yellow */
  --color-accent-dk: #c8bc20;
  --color-green:     #3ecf8e;
  --color-blue:      #5ba3f5;
  --color-orange:    #f0a040;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
  --max-w: 860px;
  --radius: 6px;
  --radius-lg: 10px;
  --transition: 0.18s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

img { max-width: 100%; display: block; }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-accent-dk); }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

/* ----- Utility ----- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ----- Header / Nav ----- */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1rem;
  gap: 1rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--color-accent); }
.nav-logo img { flex-shrink: 0; }

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--color-muted);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--color-text); }

/* ----- Hero (landing) ----- */
.hero {
  padding-block: 5rem 4rem;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.hero-inner {
  max-width: 680px;
}

.hero-title {
  font-size: clamp(2.2rem, 6.5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-title em {
  font-style: normal;
  color: var(--color-accent);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 520px;
  margin-bottom: 2rem;
  line-height: 1.75;
}

.hero-cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ----- Buttons ----- */
.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #0f0f0f;
}
.btn-primary:hover {
  background-color: var(--color-accent-dk);
  color: #0f0f0f;
}

.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  color: var(--color-text);
  border-color: var(--color-faint);
}

/* ----- Generic sections ----- */
.section {
  padding-block: 4rem;
  border-top: 1px solid var(--color-border);
}

.section-alt {
  background-color: var(--color-surface2);
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

.section-sub {
  color: var(--color-muted);
  font-size: 1rem;
  max-width: 480px;
}

/* ----- Roadmap ----- */
.roadmap-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: none;
  position: relative;
}

/* vertical connector line */
.roadmap-list::before {
  content: '';
  position: absolute;
  left: 1.35rem;
  top: 2.8rem;
  bottom: 2.8rem;
  width: 2px;
  background: var(--color-border);
}

.roadmap-item {
  display: flex;
  gap: 1.75rem;
  padding-block: 0;
  position: relative;
}

.roadmap-item + .roadmap-item {
  margin-top: 2.5rem;
}

.roadmap-phase {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.phase-number {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-muted);
  position: relative;
  z-index: 1;
}

.roadmap-item:first-child .phase-number {
  border-color: var(--color-green);
  color: var(--color-green);
}

.phase-badge {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.2em 0.55em;
  border-radius: 99px;
  white-space: nowrap;
}

.badge-active {
  background: rgba(62, 207, 142, 0.12);
  color: var(--color-green);
  border: 1px solid rgba(62, 207, 142, 0.3);
}

.badge-planning {
  background: rgba(91, 163, 245, 0.1);
  color: var(--color-blue);
  border: 1px solid rgba(91, 163, 245, 0.25);
}

.badge-horizon {
  background: rgba(240, 160, 64, 0.1);
  color: var(--color-orange);
  border: 1px solid rgba(240, 160, 64, 0.25);
}

.roadmap-body {
  padding-top: 0.3rem;
  padding-bottom: 0.5rem;
}

.roadmap-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}

.roadmap-desc {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 1rem;
  max-width: 580px;
}

.roadmap-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.roadmap-tags li {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-faint);
  border: 1px solid var(--color-border);
  border-radius: 99px;
  padding: 0.15em 0.65em;
}

.roadmap-gh-link {
  display: inline-block;
  margin-top: 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-muted);
  transition: color var(--transition);
}
.roadmap-gh-link:hover { color: var(--color-accent); }

/* ----- Side project cards ----- */
.side-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.side-card {
  background: var(--color-surface2);
  padding: 1.6rem;
  display: block;
  color: var(--color-text);
  transition: background var(--transition);
}

.side-card:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.side-card-icon {
  font-size: 1.6rem;
  margin-bottom: 0.9rem;
  line-height: 1;
}

.side-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.side-card p {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.65;
}

.inline-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(240, 224, 64, 0.12);
  color: var(--color-accent);
  border: 1px solid rgba(240, 224, 64, 0.25);
  border-radius: 4px;
  padding: 0.1em 0.45em;
  vertical-align: middle;
}

/* ----- Philosophy strip ----- */
.philosophy-strip {
  background: transparent;
}

.philosophy-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
}

blockquote {
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.65;
  letter-spacing: -0.01em;
  max-width: 640px;
  border-left: 3px solid var(--color-accent);
  padding-left: 1.25rem;
}

/* ----- Page Hero (inner pages) ----- */
.page-hero {
  padding-block: 3.5rem 2rem;
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.6rem;
}

.page-hero-sub {
  color: var(--color-muted);
  font-size: 1rem;
}

/* ----- Content prose ----- */
.content-section {
  padding-block: 3rem;
}

.content-prose h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 2.25rem;
  margin-bottom: 0.6rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.content-prose h2:first-child { margin-top: 0; }

.content-prose p {
  color: var(--color-muted);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.content-prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ----- Callout boxes ----- */
.callout {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-block: 1.5rem;
  line-height: 1.65;
}

.callout strong { color: var(--color-text); }

.callout-accent {
  border-color: rgba(240, 224, 64, 0.25);
  background: rgba(240, 224, 64, 0.05);
}

/* ----- Feature list (IPRL page) ----- */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-block: 1.25rem 1.5rem;
}

.feature-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.feature-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.1rem;
}

.feature-item strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.feature-item p {
  margin: 0;
  font-size: 0.88rem;
}

/* ----- Footer ----- */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: 1.25rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.footer-inner p {
  color: var(--color-muted);
  font-size: 0.82rem;
}

/* ----- Responsive ----- */
@media (max-width: 600px) {
  .hero { padding-block: 3rem 2.5rem; }
  .section { padding-block: 2.75rem; }
  .nav-links { gap: 0.9rem; }
  .roadmap-list::before { display: none; }
  .side-grid { grid-template-columns: 1fr; }
}