/* ============================================================
   JAPL Language — Homepage Styles
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg:         #0a0e17;
  --surface:    #141922;
  --surface-2:  #1a1f2e;
  --accent:     #7c5cfc;
  --accent-dim: rgba(124, 92, 252, 0.12);
  --accent-glow:rgba(124, 92, 252, 0.25);
  --text:       #e2e8f0;
  --text-dim:   #94a3b8;
  --muted:      #64748b;
  --border:     #1e293b;
  --code-bg:    #1a1f2e;
  --rust:       #f97316;
  --erlang:     #22c55e;
  --ml:         #7c5cfc;
  --go:         #38bdf8;
  --radius:     10px;
  --radius-lg:  16px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: #9d85fd; }

/* --- Layout --- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 100px 0;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-dim);
  max-width: 600px;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* --- Navigation --- */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

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

.nav-logo {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text);
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
  transition: 0.3s;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 60px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.4;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-wordmark {
  font-size: 5rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.hero-tagline {
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text-dim);
  margin-bottom: 24px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: #6a48e6;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--muted);
  color: #fff;
  transform: translateY(-1px);
}

/* --- Principles Grid --- */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.principle-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: border-color 0.25s, transform 0.25s;
}
.principle-card:hover {
  border-color: rgba(124, 92, 252, 0.3);
  transform: translateY(-2px);
}

.principle-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1rem;
  color: var(--accent);
  font-weight: 700;
}

.principle-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.principle-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.65;
}

/* --- Code Example --- */
.code-section { background: var(--surface); }

.code-block {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  overflow-x: auto;
  margin-top: 40px;
  position: relative;
}

.code-block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.code-dot--red   { background: #ef4444; }
.code-dot--yellow{ background: #eab308; }
.code-dot--green { background: #22c55e; }

.code-block-title {
  margin-left: 12px;
  font-size: 0.8rem;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
}

pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-dim);
  white-space: pre;
  tab-size: 2;
}

/* Syntax colors */
.kw  { color: #c084fc; }           /* keywords */
.ty  { color: #7dd3fc; }           /* types */
.fn  { color: #67e8f9; }           /* function names */
.str { color: #86efac; }           /* strings */
.cmt { color: #475569; font-style: italic; }  /* comments */
.op  { color: #f0abfc; }           /* operators */
.num { color: #fbbf24; }           /* numbers */
.pun { color: #64748b; }           /* punctuation */
.pipe{ color: #f97316; }           /* pipe/match */

/* --- Papers --- */
.papers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.paper-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.25s, transform 0.25s;
}
.paper-card:hover {
  border-color: rgba(124, 92, 252, 0.3);
  transform: translateY(-2px);
}

.paper-number {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}

.paper-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.paper-card p {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
  flex: 1;
}

.paper-meta {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--muted);
}

.paper-links {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.paper-link {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: all 0.2s;
}
.paper-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- DNA / Influences --- */
.dna-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.dna-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s;
}
.dna-card:hover {
  transform: translateY(-2px);
}

.dna-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.dna-card--ml::before    { background: var(--ml); }
.dna-card--rust::before  { background: var(--rust); }
.dna-card--erlang::before{ background: var(--erlang); }
.dna-card--go::before    { background: var(--go); }

.dna-card--ml:hover    { border-color: rgba(124, 92, 252, 0.4); }
.dna-card--rust:hover  { border-color: rgba(249, 115, 22, 0.4); }
.dna-card--erlang:hover{ border-color: rgba(34, 197, 94, 0.4); }
.dna-card--go:hover    { border-color: rgba(56, 189, 248, 0.4); }

.dna-source {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.dna-card--ml .dna-source    { color: var(--ml); }
.dna-card--rust .dna-source  { color: var(--rust); }
.dna-card--erlang .dna-source{ color: var(--erlang); }
.dna-card--go .dna-source    { color: var(--go); }

.dna-label {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.dna-desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.dna-arrow {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 4px;
}

/* --- Compiler --- */
.compiler-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-top: 40px;
}

.compiler-stage {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  position: relative;
}

.compiler-stage-name {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.compiler-stage-desc {
  font-size: 0.78rem;
  color: var(--muted);
}

.compiler-stat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-dim);
  border-radius: 8px;
  padding: 10px 20px;
  margin-top: 32px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

/* --- Footer --- */
footer {
  border-top: 1px solid var(--border);
  padding: 60px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}

.footer-brand h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.footer-brand p {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--muted);
  font-size: 0.88rem;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .dna-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.96);
    backdrop-filter: blur(16px);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }
  .nav-hamburger { display: block; }

  .hero-wordmark { font-size: 3rem; }
  .hero-tagline  { font-size: 1.1rem; }

  section { padding: 64px 0; }
  .section-title { font-size: 1.6rem; }

  .principles-grid { grid-template-columns: 1fr; }
  .papers-grid     { grid-template-columns: 1fr; }
  .dna-grid        { grid-template-columns: 1fr; }
  .compiler-grid   { grid-template-columns: repeat(2, 1fr); }

  pre { font-size: 0.78rem; }
  .code-block { padding: 20px; }
}