:root {
  --bg: #f8fafc;
  --bg-secondary: #f1f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --text-secondary: #475569;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e2e8f0;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 20px 30px -10px rgba(0, 0, 0, 0.1);
}

body.dark {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --card: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #334155;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 20px 30px -10px rgba(0, 0, 0, 0.4);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 0%, var(--text) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.accent {
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

#themeToggle {
  width: 3rem;
  height: 3rem;
  border-radius: 3rem;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: all 0.2s;
  box-shadow: var(--shadow);
}

#themeToggle:hover {
  transform: scale(1.05);
  border-color: var(--accent);
  background: var(--bg-secondary);
}

.center {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 2rem;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.auth-box {
  background: var(--card);
  border-radius: 1.5rem;
  padding: 2rem;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  transition: transform 0.2s, box-shadow 0.2s;
}

.auth-box:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.auth-box h2 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

input {
  width: 100%;
  padding: 0.875rem 1rem;
  margin: 0.5rem 0 1rem 0;
  border: 2px solid var(--border);
  border-radius: 1rem;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 1rem;
  transition: all 0.2s;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

button {
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: linear-gradient(135deg, var(--accent), #4f46e5);
  color: white;
  border: none;
  border-radius: 1rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
  margin: 0.5rem 0;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
  background: linear-gradient(135deg, var(--accent-hover), #4338ca);
}

button:active {
  transform: translateY(0);
}

.card {
  background: var(--card);
  border-radius: 2rem;
  padding: 2.5rem;
  margin: 2rem auto;
  max-width: 600px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  text-align: center;
}

.card h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin: 1rem 0;
}

#balanceDisplay {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
  border-radius: 2rem;
  margin-top: 0.5rem;
}

.hidden {
  display: none !important;
}

/* Анимации */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-box, .card {
  animation: fadeIn 0.3s ease-out;
}

/* Для мобильных устройств */
@media (max-width: 768px) {
  .header {
    padding: 1rem;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  .center {
    padding: 1rem;
    gap: 1rem;
  }
  
  .auth-box {
    max-width: 100%;
  }
  
  .card {
    margin: 1rem;
    padding: 1.5rem;
  }
  
  #balanceDisplay {
    font-size: 2rem;
  }
}