/* style.css — FootballEdge Design System
   Dark-mode-first sports analytics platform
   Palette: Dark navy/charcoal + green/red/blue/amber accents */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ============================================
   DESIGN TOKENS
   ============================================ */

:root {
  /* Typography */
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;

  /* Type Scale (fluid) */
  --text-xs:   clamp(0.6875rem, 0.65rem + 0.2vw, 0.8125rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.2vw, 0.9375rem);
  --text-base: clamp(0.9375rem, 0.88rem + 0.3vw, 1.0625rem);
  --text-lg:   clamp(1.0625rem, 0.95rem + 0.6vw, 1.375rem);
  --text-xl:   clamp(1.375rem, 1rem + 1.2vw, 2rem);
  --text-2xl:  clamp(1.75rem, 1.2rem + 1.8vw, 2.75rem);
  --text-3xl:  clamp(2.25rem, 1rem + 3.5vw, 4rem);

  /* 4px Spacing System */
  --space-0:  0;
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 300ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 480px;
  --content-default: 720px;
  --content-wide: 1080px;
  --content-full: 100%;
}

/* ============================================
   DARK THEME (default)
   ============================================ */
:root, [data-theme="dark"] {
  --color-bg:               #0f1117;
  --color-surface:          #1a1d27;
  --color-surface-2:        #21242f;
  --color-surface-offset:   #161923;
  --color-surface-offset-2: #252836;
  --color-surface-dynamic:  #2d3041;
  --color-divider:          #2a2d3a;
  --color-border:           #333648;

  /* Text */
  --color-text:             #e2e4ea;
  --color-text-muted:       #8b8fa3;
  --color-text-faint:       #555970;
  --color-text-inverse:     #0f1117;

  /* Primary — Blue */
  --color-primary:          #3b82f6;
  --color-primary-hover:    #2563eb;
  --color-primary-active:   #1d4ed8;
  --color-primary-highlight: rgba(59, 130, 246, 0.12);

  /* Success — Green (wins) */
  --color-success:          #22c55e;
  --color-success-hover:    #16a34a;
  --color-success-active:   #15803d;
  --color-success-highlight: rgba(34, 197, 94, 0.12);

  /* Error — Red (losses) */
  --color-error:            #ef4444;
  --color-error-hover:      #dc2626;
  --color-error-active:     #b91c1c;
  --color-error-highlight:  rgba(239, 68, 68, 0.12);

  /* Warning / Premium — Amber */
  --color-warning:          #f59e0b;
  --color-warning-hover:    #d97706;
  --color-warning-active:   #b45309;
  --color-warning-highlight: rgba(245, 158, 11, 0.12);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
}

/* ============================================
   LIGHT THEME
   ============================================ */
[data-theme="light"] {
  --color-bg:               #f5f6f8;
  --color-surface:          #ffffff;
  --color-surface-2:        #fafbfc;
  --color-surface-offset:   #eef0f4;
  --color-surface-offset-2: #e4e7ed;
  --color-surface-dynamic:  #dde0e8;
  --color-divider:          #d4d7e0;
  --color-border:           #c8ccd6;

  --color-text:             #111827;
  --color-text-muted:       #6b7280;
  --color-text-faint:       #9ca3af;
  --color-text-inverse:     #ffffff;

  --color-primary:          #2563eb;
  --color-primary-hover:    #1d4ed8;
  --color-primary-active:   #1e40af;
  --color-primary-highlight: rgba(37, 99, 235, 0.1);

  --color-success:          #16a34a;
  --color-success-hover:    #15803d;
  --color-success-active:   #166534;
  --color-success-highlight: rgba(22, 163, 74, 0.1);

  --color-error:            #dc2626;
  --color-error-hover:      #b91c1c;
  --color-error-active:     #991b1b;
  --color-error-highlight:  rgba(220, 38, 38, 0.1);

  --color-warning:          #d97706;
  --color-warning-hover:    #b45309;
  --color-warning-active:   #92400e;
  --color-warning-highlight: rgba(217, 119, 6, 0.1);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

/* ============================================
   SKELETON LOADERS
   ============================================ */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface-offset) 25%,
    var(--color-surface-dynamic) 50%,
    var(--color-surface-offset) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

/* ============================================
   COMPONENT PRIMITIVES
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-interactive);
  white-space: nowrap;
  min-height: 36px;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}
.btn-primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }

.btn-success {
  background: var(--color-success);
  color: var(--color-text-inverse);
  border-color: var(--color-success);
}
.btn-success:hover { background: var(--color-success-hover); border-color: var(--color-success-hover); }

.btn-warning {
  background: var(--color-warning);
  color: var(--color-text-inverse);
  border-color: var(--color-warning);
}
.btn-warning:hover { background: var(--color-warning-hover); border-color: var(--color-warning-hover); }

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-surface-offset); color: var(--color-text); }

.btn-secondary {
  background: var(--color-surface-offset);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { background: var(--color-surface-dynamic); }

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  min-height: 28px;
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  min-height: 44px;
}

.btn:disabled, .btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: border-color var(--transition-interactive);
}
.card:hover { border-color: var(--color-text-faint); }
.card-flat { box-shadow: none; }
.card-interactive { cursor: pointer; }
.card-interactive:hover { border-color: var(--color-primary); }

/* Inputs */
.input-group { display: flex; flex-direction: column; gap: var(--space-1); }
.input-group label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.input {
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--transition-interactive);
  min-height: 40px;
}
.input::placeholder { color: var(--color-text-faint); }
.input:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 3px var(--color-primary-highlight); }
.input-error { border-color: var(--color-error); }
.input-error:focus { box-shadow: 0 0 0 3px var(--color-error-highlight); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  line-height: 1.4;
}

.badge-primary { background: var(--color-primary-highlight); color: var(--color-primary); }
.badge-success { background: var(--color-success-highlight); color: var(--color-success); }
.badge-error { background: var(--color-error-highlight); color: var(--color-error); }
.badge-warning { background: var(--color-warning-highlight); color: var(--color-warning); }
.badge-neutral { background: var(--color-surface-offset); color: var(--color-text-muted); }

/* Tabs */
.tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-divider);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-interactive);
  white-space: nowrap;
  cursor: pointer;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}
.tab:hover { color: var(--color-text); }
.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-divider);
  border: none;
  margin: var(--space-4) 0;
}

/* Tabular numbers for data */
.tabnum {
  font-variant-numeric: tabular-nums lining-nums;
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--color-text-muted);
}
.empty-state svg { margin-bottom: var(--space-4); color: var(--color-text-faint); }
.empty-state h3 { color: var(--color-text); margin-bottom: var(--space-2); font-size: var(--text-lg); }
.empty-state p { max-width: 36ch; margin-bottom: var(--space-4); font-size: var(--text-sm); }

/* ============================================
   ERROR BANNER
   ============================================ */
.error-banner {
  background: var(--color-error-highlight);
  color: var(--color-error);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(8px); }
  to { o