:root {
  --bg-dark: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --accent-gold: #f59e0b;
  --accent-blue: #3b82f6;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background-color: #020617;
  border-bottom: 1px solid var(--card-border);
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

@media (min-width: 768px) {
  header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
  }
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-badge {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #000;
  font-weight: 800;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  white-space: nowrap;
}

h1 {
  font-size: 1.1rem;
  font-weight: 700;
  background: linear-gradient(to right, #f8fafc, #93c5fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

nav {
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
nav::-webkit-scrollbar {
  display: none;
}

.nav-btn {
  background: #1e293b;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.8rem;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.nav-btn.active, .nav-btn:hover {
  background: #3b82f6;
  color: #ffffff;
  border-color: #3b82f6;
}

main {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  flex: 1;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1.25rem;
  width: 100%;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

@media (min-width: 640px) {
  .card {
    padding: 1.5rem;
  }
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--card-border);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-gold);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.ball-container {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.ball {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
  box-shadow: inset -2px -2px 6px rgba(0,0,0,0.4), 0 4px 6px rgba(0,0,0,0.2);
}

@media (min-width: 640px) {
  .ball {
    width: 42px;
    height: 42px;
    font-size: 1.05rem;
  }
}

.ball-main {
  background: radial-gradient(circle at 30% 30%, #60a5fa, #1d4ed8);
}

.ball-power {
  background: radial-gradient(circle at 30% 30%, #f87171, #dc2626);
}

.multiplier-tag {
  background: #374151;
  color: var(--accent-gold);
  font-weight: 700;
  padding: 0.3rem 0.6rem;
  border-radius: 20px;
  font-size: 0.75rem;
  border: 1px solid var(--accent-gold);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

.table-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  white-space: nowrap;
}

.data-table th, .data-table td {
  padding: 0.6rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--card-border);
}

.data-table th {
  background-color: #0f172a;
  color: var(--text-muted);
  font-weight: 600;
}

.controls-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  background: #0f172a;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--card-border);
}

@media (min-width: 640px) {
  .controls-group {
    flex-direction: row;
    align-items: center;
  }
}

input[type="number"], select {
  background: #1e293b;
  border: 1px solid var(--card-border);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  width: 100%;
}

@media (min-width: 640px) {
  input[type="number"] {
    width: auto;
  }
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: white;
  border: none;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
}

@media (min-width: 640px) {
  .btn-primary {
    width: auto;
  }
}

.strategy-item {
  background: #0f172a;
  border-left: 4px solid var(--accent-gold);
  padding: 0.85rem;
  margin-bottom: 0.85rem;
  border-radius: 0 8px 8px 0;
}

.strategy-item h3 {
  font-size: 0.95rem;
  color: var(--accent-gold);
  margin-bottom: 0.3rem;
}

.strategy-item p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.4;
}

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

/* LOGIN OVERLAY & AUTHENTICATION STYLES */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(2, 6, 23, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.login-card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 16px;
  width: 100%;
  max-width: 420px;
  padding: 2rem 1.5rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  animation: fadeInScale 0.3s ease-out;
}

@keyframes fadeInScale {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.login-header {
  text-align: center;
}

.login-header h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-top: 0.5rem;
}

.user-select-dropdown {
  background: #0f172a;
  border: 1px solid #334155;
  color: #fff;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  width: 100%;
  outline: none;
  margin-top: 0.35rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-input {
  background: #0f172a;
  border: 1px solid #334155;
  color: #fff;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 1rem;
  outline: none;
  width: 100%;
}

.form-input:focus, .user-select-dropdown:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.login-divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin: 0.25rem 0;
}

.login-divider::before, .login-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid #334155;
}

.login-divider span {
  padding: 0 0.75rem;
}

.btn-passkey {
  background: linear-gradient(135deg, #059669, #10b981);
  color: white;
  border: none;
  padding: 0.85rem 1.25rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
  width: 100%;
}

.btn-passkey:hover {
  background: linear-gradient(135deg, #047857, #059669);
  transform: translateY(-1px);
}

.btn-pwa-install {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #000;
  border: none;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-weight: 800;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  transition: all 0.2s;
}

.btn-pwa-install:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.login-error-msg {
  background: rgba(220, 38, 38, 0.15);
  border: 1px solid #ef4444;
  color: #f87171;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
}

/* HEADER USER PROFILE CONTROLS */
.user-profile-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.user-badge {
  background: #1e293b;
  border: 1px solid #334155;
  color: var(--accent-gold);
  font-weight: 700;
  font-size: 0.8rem;
  padding: 0.35rem 0.65rem;
  border-radius: 20px;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-header-action {
  background: #1e293b;
  border: 1px solid #334155;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-header-action:hover {
  background: #334155;
  border-color: #475569;
}

.btn-logout {
  color: #f87171;
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-logout:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
}