:root {
  --bg: #0f0f23;
  --card-bg: #1a1a2e;
  --card-border: #252540;
  --text: #e0e0ff;
  --text-muted: #8892b0;
  --accent: #64ffda;
  --accent-hover: #4fd1b5;
  --error: #ff6b6b;
  --error-bg: rgba(255, 107, 107, 0.1);
  --success: #4ecdc4;
  --success-bg: rgba(78, 205, 196, 0.1);
  --input-bg: #0f0f1a;
  --input-border: #252540;
  --input-focus: #64ffda;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow);
}

.logo {
  text-align: center;
  margin-bottom: 32px;
}

.logo svg {
  color: var(--accent);
  margin-bottom: 16px;
}

.logo h1 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.logo p {
  color: var(--text-muted);
  font-size: 14px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.field-group input {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--text);
  font-size: 15px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field-group input:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
}

.field-group input::placeholder {
  color: var(--text-muted);
  opacity: 0.5;
}

.field-group input.readonly {
  background: rgba(100, 255, 218, 0.05);
  border-color: rgba(100, 255, 218, 0.2);
  color: var(--accent);
  cursor: default;
}

.field-group .hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.error-banner, .success-banner {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.error-banner {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid rgba(255, 107, 107, 0.2);
}

.success-banner {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(78, 205, 196, 0.2);
}

.btn {
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
}

.btn:hover {
  background: var(--accent-hover);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-spinner {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.countdown {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

.countdown span {
  color: var(--accent);
  font-weight: 600;
}