/* NWSIA Simulator Landing Page — Dark Railway Theme */

:root {
  --bg:        #0a0c0f;
  --bg-card:   #111418;
  --bg-dark:   #060809;
  --border:    #1e2329;
  --border-hi: #2d343d;
  --text:      #e6edf3;
  --text-muted:#7d8590;
  --text-dim:  #484f58;
  --cyan:      #00b4d8;
  --cyan-dim:  #0e7490;
  --purple:    #9c89ff;
  --amber:     #d4a017;
  --green:     #3fb950;
  --red:       #f85149;
  --blue:      #58a6ff;
  --radius:    10px;
  --radius-lg: 16px;
  --shadow:    0 4px 24px rgba(0,0,0,0.5);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

/* ── Navigation ─────────────────────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,12,15,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .2s;
}
.nav.scrolled { box-shadow: 0 2px 32px rgba(0,0,0,0.6); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; height: 60px; gap: 32px;
}
.nav-logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 15px; }
.logo-mark { color: var(--cyan); font-size: 18px; }
.logo-accent { color: var(--cyan); }
.nav-links { display: flex; gap: 24px; list-style: none; margin-left: auto; }
.nav-links a { color: var(--text-muted); font-size: 13.5px; transition: color .15s; }
.nav-links a:hover { color: var(--text); }
.nav-cta { margin-left: 8px; font-size: 13px; padding: 7px 16px; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 10px 20px; border-radius: var(--radius);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: all .15s; border: 1px solid transparent; white-space: nowrap;
}
.btn-primary {
  background: var(--cyan); color: #000;
  border-color: var(--cyan);
}
.btn-primary:hover { background: #00c9f0; box-shadow: 0 0 20px rgba(0,180,216,0.3); }
.btn-outline {
  background: transparent; color: var(--text);
  border-color: var(--border-hi);
}
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-lg { padding: 13px 28px; font-size: 15px; border-radius: 12px; }
.btn-full { width: 100%; justify-content: center; }

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero {
  min-height: 100vh; display: flex; align-items: center; position: relative;
  overflow: hidden; padding: 100px 24px 60px;
}
.hero-grid {
  position: absolute; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(0,180,216,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,180,216,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
}
.hero-inner {
  max-width: 1200px; margin: 0 auto; position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  width: 100%;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0,180,216,0.08); border: 1px solid rgba(0,180,216,0.2);
  border-radius: 100px; padding: 5px 14px; font-size: 12px;
  color: var(--cyan); font-family: 'JetBrains Mono', monospace;
  margin-bottom: 20px; letter-spacing: 0.4px;
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(1.4)} }
.hero-title {
  font-size: clamp(36px, 5vw, 58px); font-weight: 800; line-height: 1.1;
  letter-spacing: -1.5px; margin-bottom: 18px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  color: var(--text-muted); font-size: 16px; line-height: 1.7; margin-bottom: 32px;
  max-width: 480px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; }
.stat-val { font-size: 20px; font-weight: 700; color: var(--cyan); font-family: 'JetBrains Mono', monospace; }
.stat-lbl { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.6px; }
.stat-divider { width: 1px; height: 32px; background: var(--border); }

/* ── Hero Schematic ─────────────────────────────────────────────────────── */
.hero-schematic {
  display: flex; align-items: center; justify-content: center;
}
.track-diagram {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px 32px; position: relative;
  min-width: 320px;
}
.track-label { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-dim); margin-bottom: 3px; }
.track-line {
  height: 4px; border-radius: 2px; margin-bottom: 10px; position: relative;
  background: var(--border-hi);
}
.ml-sb-f, .ml-sb-l, .ml-nb-l, .ml-nb-f { background: linear-gradient(90deg, #f5a6a8 0%, #f5a6a8 100%); opacity: 0.7; }
.jl-sb, .jl-nb { background: linear-gradient(90deg, #d5d7d9 0%, #d5d7d9 100%); opacity: 0.7; }
.train-dot {
  position: absolute; width: 12px; height: 12px; border-radius: 2px;
  background: var(--cyan); top: -4px; animation: slide 4s linear infinite;
}
.t1 { animation-delay: 0s; }
.t2 { animation-delay: 1.5s; background: var(--purple); }
.t3 { animation-delay: 3s; animation-direction: reverse; }
@keyframes slide {
  0%   { left: 0%; }
  100% { left: calc(100% - 12px); }
}
.station-marker {
  position: absolute; font-family: 'JetBrains Mono', monospace; font-size: 9px;
  color: var(--cyan); top: 50%; transform: translateY(-50%);
  background: var(--bg-card); padding: 2px 5px; border: 1px solid var(--cyan-dim);
  border-radius: 3px;
}
.s1 { left: -2px; }
.s2 { right: -2px; }

/* ── Sections ───────────────────────────────────────────────────────────── */
.section { padding: 80px 24px; }
.section-dark { background: var(--bg-dark); }
.container { max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-label {
  display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--cyan); margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
}
.section-title { font-size: clamp(24px, 3vw, 36px); font-weight: 700; margin-bottom: 12px; letter-spacing: -.5px; }
.section-sub { color: var(--text-muted); font-size: 16px; max-width: 560px; margin: 0 auto; }

/* ── Features Grid ──────────────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px;
  transition: border-color .2s, transform .2s;
}
.feature-card:hover { border-color: var(--border-hi); transform: translateY(-2px); }
.feature-icon { font-size: 24px; margin-bottom: 12px; }
.feature-icon.cyan   { color: var(--cyan); }
.feature-icon.purple { color: var(--purple); }
.feature-icon.amber  { color: var(--amber); }
.feature-icon.green  { color: var(--green); }
.feature-icon.blue   { color: var(--blue); }
.feature-icon.red    { color: var(--red); }
.feature-card h3 { font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.feature-card p  { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ── Architecture Diagram ────────────────────────────────────────────────── */
.arch-diagram {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px; margin-bottom: 40px;
  text-align: center;
}
.arch-layer { margin-bottom: 8px; }
.arch-label { font-size: 11px; color: var(--text-dim); margin-bottom: 10px; font-family: 'JetBrains Mono', monospace; text-transform: uppercase; letter-spacing: 0.8px; }
.arch-nodes { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.arch-node {
  padding: 8px 14px; border-radius: 8px; font-size: 12px; font-weight: 600;
  border: 1px solid; line-height: 1.4;
}
.arch-node.cyan   { background: rgba(0,180,216,0.08);  border-color: rgba(0,180,216,0.25);  color: var(--cyan); }
.arch-node.purple { background: rgba(156,137,255,0.08); border-color: rgba(156,137,255,0.25); color: var(--purple); }
.arch-node.amber  { background: rgba(212,160,23,0.08);  border-color: rgba(212,160,23,0.25);  color: var(--amber); }
.arch-arrows { padding: 8px 0; }
.arch-arrow { font-size: 11px; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; }
.arch-features { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.arch-feature { display: flex; gap: 14px; }
.af-dot { width: 8px; height: 8px; border-radius: 50%; margin-top: 5px; flex-shrink: 0; }
.af-dot.cyan   { background: var(--cyan); }
.af-dot.purple { background: var(--purple); }
.af-dot.amber  { background: var(--amber); }
.af-dot.green  { background: var(--green); }
.arch-feature strong { display: block; font-size: 13px; margin-bottom: 4px; }
.arch-feature p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.arch-feature code {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  background: rgba(0,0,0,0.3); padding: 1px 5px; border-radius: 3px;
  color: var(--cyan);
}

/* ── Steps Grid ─────────────────────────────────────────────────────────── */
.steps-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px;
}
.step-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px;
}
.step-num {
  font-family: 'JetBrains Mono', monospace; font-size: 28px; font-weight: 700;
  color: var(--border-hi); margin-bottom: 12px;
}
.step-card h3 { font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.step-card p  { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; line-height: 1.6; }
.step-card code { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--cyan); }
.step-code {
  background: #060809; border: 1px solid var(--border); border-radius: 6px;
  padding: 10px 12px; font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: var(--green); line-height: 1.7; white-space: pre;
}

/* ── Downloads ──────────────────────────────────────────────────────────── */
.downloads-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px; max-width: 800px; margin: 0 auto;
}
.download-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px 24px; text-align: center;
  position: relative; transition: border-color .2s;
}
.download-card.featured { border-color: var(--cyan); }
.download-card:hover { border-color: var(--border-hi); }
.dl-badge {
  position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
  background: var(--bg-card); border: 1px solid var(--border);
  padding: 2px 10px; border-radius: 100px; font-size: 10px; font-weight: 700;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.6px;
}
.download-card.featured .dl-badge { border-color: var(--cyan); color: var(--cyan); }
.dl-icon { font-size: 36px; margin-bottom: 12px; margin-top: 8px; }
.download-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.download-card p  { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; line-height: 1.6; }
.dl-ver { display: block; font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-dim); margin-top: 10px; }

/* ── Data Flow ──────────────────────────────────────────────────────────── */
.flow-steps { max-width: 640px; margin: 0 auto; }
.flow-step   { display: flex; gap: 16px; margin-bottom: 4px; }
.flow-num {
  width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center;
  justify-content: center; font-weight: 700; font-size: 13px; flex-shrink: 0;
  margin-top: 2px;
}
.flow-num.cyan   { background: rgba(0,180,216,.15);  color: var(--cyan); }
.flow-num.purple { background: rgba(156,137,255,.15); color: var(--purple); }
.flow-num.amber  { background: rgba(212,160,23,.15);  color: var(--amber); }
.flow-num.green  { background: rgba(63,185,80,.15);   color: var(--green); }
.flow-content h4 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.flow-content p  { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.flow-content code {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  background: rgba(0,0,0,.4); padding: 1px 5px; border-radius: 3px; color: var(--cyan);
}
.flow-arrow { text-align: center; font-size: 18px; color: var(--border-hi); margin: 8px 0 8px 60px; }

/* ── Footer ─────────────────────────────────────────────────────────────── */
.footer {
  background: var(--bg-dark); border-top: 1px solid var(--border);
  padding: 48px 24px 24px;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 2fr; gap: 48px; margin-bottom: 32px;
}
.footer-brand .logo-mark { font-size: 20px; }
.footer-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-top: 10px; max-width: 280px; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-col h4 { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px; color: var(--text); margin-bottom: 12px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a  { font-size: 13px; color: var(--text-muted); transition: color .15s; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--border); padding-top: 20px;
  font-size: 12px; color: var(--text-dim);
}
.footer-tech { font-family: 'JetBrains Mono', monospace; }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-inner    { grid-template-columns: 1fr; }
  .hero-schematic { display: none; }
  .arch-features { grid-template-columns: 1fr; }
  .footer-inner  { grid-template-columns: 1fr; }
  .footer-links  { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nav-links { display: none; }
  .hero-actions { flex-direction: column; }
  .footer-links { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}