:root {
  --bg: #05060a;
  --bg-soft: #0b0d16;
  --panel: #101320;
  --panel-soft: #16192a;
  --accent: #ff4fbf;
  --accent-soft: rgba(255, 79, 191, 0.16);
  --accent-alt: #41e4ff;
  --text-main: #f7f7ff;
  --text-muted: #a0a6c0;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-pill: 999px;
  --shadow-soft: 0 20px 50px rgba(0, 0, 0, 0.6);
  --transition-fast: 0.2s ease-out;
  --success: #00ff9d; /* Neon Green */
}

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

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at top, #191b32 0, #05060a 45%, #020208 100%);
  color: var(--text-main);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 12px 40px;
}

/* --- FIXED BACKGROUND (Star Field) --- */
.fixed-background {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0; 
  background-color: #020205; 
  overflow: hidden;
  pointer-events: none;
  transform: translateZ(0); 
  backface-visibility: hidden;
}

.fixed-background::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 25px 5px, white 1px, transparent 1.5px),
    radial-gradient(circle at 50px 25px, rgba(255,255,255,0.8) 1px, transparent 1.5px),
    radial-gradient(circle at 125px 20px, white 1px, transparent 1.5px),
    radial-gradient(circle at 200px 65px, rgba(255,255,255,0.6) 1px, transparent 1.5px),
    radial-gradient(circle at 300px 10px, white 1px, transparent 1.5px),
    radial-gradient(circle at 360px 45px, rgba(255,255,255,0.9) 1px, transparent 1.5px);
  background-size: 400px 400px;
  opacity: 0.6; 
  will-change: background-position;
  animation: starIntro 40s linear infinite;
}

.fixed-background::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 75px 100px, white 1.5px, transparent 2.5px),
    radial-gradient(circle at 150px 250px, white 1px, transparent 2px),
    radial-gradient(circle at 320px 380px, white 1.5px, transparent 2.5px);
  background-size: 550px 550px; 
  opacity: 0.8; 
  will-change: background-position;
  animation: starIntroFast 30s linear infinite;
}

@keyframes starIntro {
  from { background-position: 0 0; }
  to { background-position: 0 400px; }
}

@keyframes starIntroFast {
  from { background-position: 0 0; }
  to { background-position: 0 550px; }
}

/* SHELL */
.arc-shell {
  width: 100%;
  max-width: 980px;
  background: rgba(11, 13, 22, 0.95);
  border-radius: 26px;
  border: 1px solid var(--border-subtle);
  padding: 22px 20px 26px;
  box-shadow: var(--shadow-soft);
  position: relative;
  z-index: 1; 
}

/* --- NAVIGATION STYLES (UPDATED) --- */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding: 0 10px;
}

.back-link {
  /* Green Text */
  color: var(--success);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color 0.2s;
  /* Removed Pill Styles (background/border/padding) */
  background: transparent;
  border: none;
  padding: 0;
}

.back-link:hover {
  color: #ffffff; /* White on hover */
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
}

/* HEADER */
.arc-header {
  text-align: center;
  margin-bottom: 18px;
}

h1 {
  font-size: 2.5rem;
  margin: 0;
  background: linear-gradient(to right, #fff, #a0a6c0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1px;
  text-transform: uppercase;
}

.arc-tagline {
  margin: 6px 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* META */
.arc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  padding: 8px 10px;
  margin-bottom: 18px;
  border-radius: 999px;
  background: rgba(9, 11, 22, 0.9);
  border: 1px solid var(--border-subtle);
}

.arc-meta-item {
  display: flex;
  flex-direction: column;
  text-align: center;
  padding: 4px 12px;
}

.arc-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.15em;
}

.arc-value {
  font-size: 0.85rem;
  margin-top: 3px;
}

/* FLEX GRID */
.arc-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* CARD */
.arc-card {
  background: var(--panel);
  border-radius: var(--radius-lg);
  padding: 14px;
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
  width: 100%;
  z-index: 1; 
}

@media (min-width: 800px) {
  .arc-card { width: calc(50% - 7px); }
  .arc-card.arc-span-2 { width: 100%; }
}

#card-chains {
  padding: 30px; 
}

.arc-card--live:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 24px 40px rgba(0, 0, 0, 0.65);
  background: radial-gradient(circle at top left, #1c2145 0, #101320 60%);
}

/* CARD CONTENT LAYERING */
.arc-card-header, 
.arc-card-body, 
.arc-card-actions {
  position: relative;
  z-index: 10;
}

.arc-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.arc-card-icon {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

/* ICONS */
.arc-card-icon--chain { background: radial-gradient(circle at top, #8affc1 0, #00d64b 50%, #006622 100%); color: #02200a; }
.arc-card-icon--light { background: radial-gradient(circle at top, #fff9c4 0, #ffd700 50%, #ff8f00 100%); color: #3e2700; }
.arc-card-icon--mine { background: radial-gradient(circle at top, #ff8c6b 0, #ff3b3b 40%, #6b0f1a 100%); }
.arc-card-icon--wild { background: radial-gradient(circle at top, #ff4fbf 0, #41e4ff 40%, #ffd86b 100%); }
.arc-card-icon--cross { background: radial-gradient(circle at top left, #41e4ff 0, #0044ff 100%); color: #ff004c; }
.arc-card-icon--neon { background: #FF9F2E; color: #FF4F70; } 

.arc-card-header h2 { margin: 0; font-size: 1rem; }
.arc-card-sub { margin: 2px 0 0; font-size: 0.8rem; color: var(--text-muted); }
.arc-card-body { font-size: 0.8rem; color: var(--text-muted); }

.arc-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.arc-btn {
  flex: 1;
  min-width: 120px;
  white-space: nowrap;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-main);
  font-size: 0.8rem;
  padding: 8px 10px;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.arc-btn--primary { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.4); font-weight: 500; color: #fff; }
.arc-btn--primary:hover { background: rgba(255, 255, 255, 0.15); border-color: #fff; box-shadow: 0 0 12px rgba(255, 255, 255, 0.25); transform: translateY(-1px); }
.arc-btn--disabled, .arc-btn--disabled:hover { 
  background: rgba(255, 255, 255, 0.08); 
  color: #9ca3af; 
  border-color: rgba(255, 255, 255, 0.15);
  opacity: 1; 
  cursor: default;
}

/* FOOTER (UPDATED) */
.arc-footer {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.8rem;
  color: #ffffff; /* White text */
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.arc-footer p { margin: 0; }
.arc-legal { opacity: 0.9; }

/* Footer Links */
.arc-footer a { 
  color: #ffffff; 
  text-decoration: none; 
  border-bottom: none; 
  transition: all var(--transition-fast);
}
.arc-footer a:hover { 
  color: #ffffff; 
  text-decoration: underline;
  opacity: 1; 
}

/* MODIFIER: CENTER CONTENT */
.arc-card--center-content { align-items: center; text-align: center; }
.arc-card--center-content .arc-card-header { flex-direction: column; gap: 6px; margin-bottom: 4px; }
.arc-card--center-content .arc-card-actions { justify-content: center; width: 100%; max-width: 500px; }

/* CONTENT SECTION */
.arc-content {
  width: 100%; max-width: 800px; margin: 40px auto 0; padding: 0 14px;
  color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; text-align: left;
  position: relative; z-index: 2;
}
.arc-content h2 { color: var(--text-main); font-size: 1.4rem; margin-bottom: 16px; margin-top: 32px; letter-spacing: 0.05em; border-bottom: 1px solid var(--border-subtle); padding-bottom: 8px; text-align: center; }
.arc-content h3 { color: #22e57f; font-size: 1.1rem; margin-bottom: 10px; margin-top: 24px; text-align: center; }
.arc-content p { margin-bottom: 16px; }
.arc-content ul { margin-bottom: 16px; padding-left: 0; list-style: none; }
.arc-content li { margin-bottom: 8px; }
.arc-content strong { color: #ffffff; }

/* STATUS BADGES */
.arc-status-badge {
  display: none; 
  font-size: 0.65rem; font-weight: 700; text-transform: uppercase;
  padding: 3px 8px; border-radius: 4px; margin-left: 8px; vertical-align: middle;
}
.arc-status-badge.visible { display: inline-block; animation: popIn 0.3s ease-out forwards; }
@keyframes popIn { 0% { opacity: 0; transform: translateY(5px); } 100% { opacity: 1; transform: translateY(0); } }

.status-solved { background: rgba(34, 229, 127, 0.15); color: #22e57f; border: 1px solid rgba(34, 229, 127, 0.4); box-shadow: 0 0 8px rgba(34, 229, 127, 0.2); }
.status-failed { background: rgba(255, 79, 112, 0.15); color: #ff4f70; border: 1px solid rgba(255, 79, 112, 0.4); box-shadow: 0 0 8px rgba(255, 79, 112, 0.2); }

/* FEATURE IMAGE */
.arc-feature-img {
  width: 100%;
  max-width: 100%;
  height: auto;       
  max-height: 350px;
  object-fit: cover;  
  object-position: center top;
  border-radius: 12px;
  margin-top: 12px;
  margin-bottom: 4px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: transform 0.2s ease;
  cursor: pointer; 
  position: relative;
  z-index: 5; 
}

.arc-card:hover .arc-feature-img {
  transform: scale(1.02);
}