/* ==========================================================================
   The Underdog — static site styles
   Dark, editorial, tech-forward. Zero dependencies beyond Google Fonts.
   ========================================================================== */

:root {
  --bg: #09090f;
  --bg-elev: #11111b;
  --bg-card: rgba(21, 21, 32, 0.72);
  --bg-card-hover: rgba(28, 28, 42, 0.9);
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);
  --text: #ededf0;
  --text-muted: #8a8a98;
  --text-dim: #5a5a68;

  --accent-1: #a855f7;   /* violet */
  --accent-2: #ec4899;   /* pink   */
  --accent-3: #38bdf8;   /* sky    */
  --gradient: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 100%);
  --gradient-soft: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(236, 72, 153, 0.15));

  --score-high: #10b981; /* emerald */
  --score-mid:  #f59e0b; /* amber   */
  --score-low:  #64748b; /* slate   */

  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 22px;

  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.04) inset,
                 0 20px 60px -20px rgba(0, 0, 0, 0.6);

  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

body {
  overflow-x: hidden;
}

.mono { font-family: var(--font-mono); font-size: 0.9em; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

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

code {
  font-family: var(--font-mono);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.88em;
}

/* --------------------------------------------------------------------------
   Backdrop — ambient gradient glows + subtle grid
   -------------------------------------------------------------------------- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.glow {
  position: absolute;
  width: 720px;
  height: 720px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
}

.glow-1 {
  top: -200px;
  left: -100px;
  background: radial-gradient(circle, var(--accent-1) 0%, transparent 70%);
}

.glow-2 {
  top: 100px;
  right: -150px;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
  opacity: 0.28;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, rgba(0, 0, 0, 0.9) 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, rgba(0, 0, 0, 0.9) 0%, transparent 70%);
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  padding: 88px 24px 56px;
  text-align: center;
}

.hero-inner {
  max-width: 880px;
  margin: 0 auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  font-size: 13px;
  letter-spacing: 0.02em;
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--score-high);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0   rgba(16, 185, 129, 0.6); }
  70%  { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0   rgba(16, 185, 129, 0); }
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  margin: 0 0 20px;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-tagline {
  max-width: 620px;
  margin: 0 auto 44px;
  color: var(--text-muted);
  font-size: 17px;
  line-height: 1.6;
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 680px;
  margin: 0 auto;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.stat {
  padding: 18px 12px;
  border-radius: calc(var(--radius) - 6px);
  text-align: center;
  transition: background 0.2s ease;
}

.stat:hover { background: rgba(255, 255, 255, 0.025); }

.stat-value {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.stat-label {
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.skeleton .stat-value,
.skeleton .stat-label {
  color: var(--text-dim);
}

@media (max-width: 540px) {
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .hero { padding-top: 64px; }
}

/* --------------------------------------------------------------------------
   Main container
   -------------------------------------------------------------------------- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

/* Run header */
.run-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 28px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.run-eyebrow {
  display: flex;
  gap: 8px;
  color: var(--text-dim);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.run-sep { color: var(--text-dim); }

#run-topic {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  letter-spacing: -0.02em;
  margin: 6px 0 8px;
}

.run-sub {
  color: var(--text-muted);
  font-size: 14px;
  display: flex;
  gap: 8px;
}

.run-nav { flex-shrink: 0; }

/* Select */
.select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 36px 10px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M2.5 4.5L6 8L9.5 4.5' stroke='%238a8a98' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: border-color 0.15s ease;
}

.select:hover { border-color: rgba(168, 85, 247, 0.4); }
.select:focus { outline: none; border-color: var(--accent-1); }

.select-sm { padding: 8px 32px 8px 12px; font-size: 13px; }

/* Controls row */
.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.chip-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  letter-spacing: 0.02em;
}

.chip:hover {
  color: var(--text);
  border-color: rgba(168, 85, 247, 0.4);
}

.chip.active {
  color: #fff;
  background: var(--gradient);
  border-color: transparent;
}

.chip-count {
  opacity: 0.7;
  font-weight: 400;
}

.chip.active .chip-count { opacity: 0.85; }

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

.sort-label {
  color: var(--text-dim);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 18px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 22px 22px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
  animation: cardIn 0.5s ease both;
  overflow: hidden;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

.card.tier-high::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1px;
  background: var(--gradient);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
  opacity: 0.55;
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.source-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.source-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--source-color, var(--accent-3));
}

.score-badge {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  background: var(--score-color, var(--score-low));
  box-shadow: 0 6px 20px -8px var(--score-color, var(--score-low));
}

.card-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.3;
  color: var(--text);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
  word-break: break-word;
}

.card-reason {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.55;
  margin: 0 0 18px;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-signal {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  color: var(--text-dim);
  font-size: 12px;
  font-family: var(--font-mono);
}

.signal-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.card-cta {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  align-self: flex-start;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.03);
  transition: all 0.15s ease;
}

.card-cta:hover {
  background: var(--gradient);
  border-color: transparent;
  color: #fff;
}

.card-cta .arrow {
  transition: transform 0.2s ease;
}

.card-cta:hover .arrow { transform: translateX(2px); }

/* --------------------------------------------------------------------------
   Empty / error state
   -------------------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: 80px 24px;
  color: var(--text-muted);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.015);
}

.empty-icon {
  font-family: var(--font-display);
  font-size: 40px;
  color: var(--accent-1);
  margin-bottom: 12px;
  opacity: 0.6;
}

.empty-state h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  color: var(--text);
  margin: 0 0 8px;
}

.empty-state p {
  max-width: 440px;
  margin: 0 auto;
  font-size: 14px;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  color: var(--text-dim);
  font-size: 13px;
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-link {
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.footer-link:hover { color: var(--text); }