/* ============================================================
   ArthemizLabs – Site Stylesheet
   Dark theme, engineering-oriented, no dependencies
   ============================================================ */

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

:root {
  --color-bg:          #0d0f12;
  --color-bg-alt:      #111418;
  --color-surface:     #161b22;
  --color-border:      #21262d;
  --color-text:        #c9d1d9;
  --color-text-muted:  #8b949e;
  --color-heading:     #e6edf3;
  --color-accent:      #1f6feb;
  --color-accent-dim:  #1158c7;
  --color-accent-soft: rgba(31, 111, 235, 0.12);
  --color-success:     #3fb950;
  --color-warning:     #d29922;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --radius:    6px;
  --max-width: 1100px;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #58a6ff;
}

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  color: var(--color-heading);
  line-height: 1.3;
  font-weight: 600;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.section-title {
  font-size: 1.75rem;
  margin-bottom: 32px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.section-body p + p {
  margin-top: 16px;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 820px;
  margin-bottom: 40px;
}

.section-footer {
  margin-top: 40px;
  text-align: center;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: 0.02em;
  text-decoration: none;
}

.logo-mark {
  width: 50px;
  height: 50px;
  border-radius: 4px;
  object-fit: cover;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-heading);
}

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 80px;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  max-width: 700px;
  margin-bottom: 20px;
}

.page-hero {
  padding: 64px 0 48px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 16px;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-dim);
  border-color: var(--color-accent-dim);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-heading);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text-muted);
  color: var(--color-heading);
}

/* ---------- Cards (Engineering Focus) ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--color-accent);
}

.card h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  color: var(--color-heading);
}

.card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- Project List (Ecosystem) ---------- */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.project-item {
  padding: 24px 28px;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
  transition: background-color 0.2s;
}

.project-item:last-child {
  border-bottom: none;
}

.project-item:hover {
  background-color: #1c2128;
}

.project-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.project-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-heading);
  font-family: var(--font-mono);
}

.project-item > p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: 760px;
}

/* ---------- Badges ---------- */
.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-active {
  background-color: rgba(63, 185, 80, 0.15);
  color: var(--color-success);
  border: 1px solid rgba(63, 185, 80, 0.4);
}

.badge-development {
  background-color: rgba(210, 153, 34, 0.15);
  color: var(--color-warning);
  border: 1px solid rgba(210, 153, 34, 0.4);
}

/* ---------- Tech Stack Grid ---------- */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.stack-category {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px;
}

.stack-category h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  font-weight: 600;
}

.stack-category ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stack-category li {
  font-size: 0.9rem;
  color: var(--color-text);
  padding-left: 14px;
  position: relative;
}

.stack-category li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 1px;
  background-color: var(--color-accent);
}

/* ---------- Roadmap Timeline (index) ---------- */
.roadmap-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.roadmap-timeline::before {
  content: '';
  position: absolute;
  left: 56px;
  top: 0;
  bottom: 0;
  width: 1px;
  background-color: var(--color-border);
}

.timeline-item {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.timeline-item:last-child {
  border-bottom: none;
}

.timeline-year {
  min-width: 80px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-mono);
  padding-top: 2px;
  text-align: center;
}

.timeline-content h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ---------- Architecture Page ---------- */
.arch-phases {
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.arch-phase {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--color-border);
}

.arch-phase:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.phase-indicator {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding-top: 4px;
}

.phase-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-border);
  font-family: var(--font-mono);
  line-height: 1;
}

.phase-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-weight: 600;
}

.phase-content h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.phase-content > p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
  max-width: 680px;
}

.detail-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 28px;
}

.detail-list li {
  font-size: 0.9rem;
  color: var(--color-text);
  padding-left: 18px;
  position: relative;
}

.detail-list li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* ---------- Architecture Diagrams ---------- */
.arch-diagram {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 20px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.modular-diagram {
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.diagram-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.modules-row,
.infra-row {
  gap: 8px;
  padding-left: 8px;
}

.diagram-box {
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  font-size: 0.78rem;
  line-height: 1.4;
  white-space: nowrap;
}

.client-box  { border-color: var(--color-text-muted); }
.nginx-box   { border-color: var(--color-accent); color: var(--color-accent); }
.app-box     { border-color: var(--color-success); color: var(--color-success); }
.mod-box     { border-color: var(--color-success); color: var(--color-success); }
.db-box      { border-color: var(--color-warning); color: var(--color-warning); }
.cache-box   { border-color: #f0883e; color: #f0883e; }
.mq-box      { border-color: #bc8cff; color: #bc8cff; }

.diagram-arrow {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* ---------- Infrastructure Grid ---------- */
.infra-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.infra-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.infra-item h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.infra-item p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- Roadmap Full Page ---------- */
.roadmap-full {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.roadmap-year-block {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

.year-header {
  background-color: var(--color-surface);
  padding: 20px 28px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 20px;
}

.year-label {
  font-size: 1.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--color-accent);
  min-width: 60px;
}

.year-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
}

.year-body {
  padding: 28px;
}

.year-summary {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  max-width: 820px;
  margin-bottom: 28px;
  line-height: 1.7;
}

.milestones {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.milestone-group {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.milestone-group h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: 12px;
}

.milestone-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.milestone-group li {
  font-size: 0.85rem;
  color: var(--color-text);
  padding-left: 14px;
  position: relative;
  line-height: 1.5;
}

.milestone-group li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 1px;
  background-color: var(--color-accent);
}

/* ---------- Footer ---------- */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.site-footer .logo {
  flex-direction: column;
  gap: 6px;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

.footer-nav a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .hero { padding: 64px 0 56px; }

  .hero h1 { font-size: 1.8rem; }

  .arch-phase {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .phase-indicator {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .roadmap-timeline::before { display: none; }

  .timeline-item { flex-direction: column; gap: 4px; }

  .year-header { flex-direction: column; align-items: flex-start; gap: 4px; }

  .header-inner { flex-direction: column; height: auto; padding: 12px 24px; gap: 8px; }

  .site-nav { gap: 16px; }
}