:root {
  --primary: #00b3ff;
  --primary-dark: #0091cc;
  --success-bg: #1e3d2c;
  --success-text: #4ade80;
  --error-bg: #3a1e1e;
  --error-text: #ef4444;
  --container-bg: #1c1f26;
  --text-color: #f5f5f5;
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.6);
  --radius: 12px;
  --transition: all 0.3s ease;
  --font: "Segoe UI", Arial, sans-serif;
}

/* Fundo principal */
body {
  font-family: var(--font);
  margin: 0;
  padding: 20px;
  background: linear-gradient(135deg, #111, #222);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-color);
}

/* Container central */
.container {
  background-color: var(--container-bg);
  padding: 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 500px;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

h1 {
  color: var(--text-color);
  text-align: center;
  margin-bottom: 25px;
}

.form-group {
  margin-bottom: 18px;
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text-color);
}

input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #444;
  border-radius: 8px;
  background: #111;
  color: var(--text-color);
  box-sizing: border-box;
  transition: var(--transition);
}

input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 179, 255, 0.25);
}

input.valid { border-color: #22c55e; }
input.invalid { border-color: #ef4444; }

/* Botões */
button {
  background: linear-gradient(135deg, var(--primary), #647cff);
  color: #fff;
  border: none;
  padding: 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
  width: 100%;
  transition: var(--transition);
}

button:hover {
  background: linear-gradient(135deg, var(--primary-dark), #5060d0);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.4);
}

button:active {
  transform: scale(0.98);
}

/* Barra de progresso */
.progress-container {
  width: 100%;
  background: #333;
  border-radius: 8px;
  margin-top: 15px;
  height: 12px;
  overflow: hidden;
  display: none;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: width 0.3s ease;
}

/* Loader */
.loader {
  border: 4px solid #222;
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  animation: spin 1s linear infinite;
  margin: 15px auto;
  display: none;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* Status */
.status {
  margin-top: 15px;
  padding: 12px;
  border-radius: 8px;
  display: none;
  text-align: center;
  font-weight: bold;
}
.success { background: var(--success-bg); color: var(--success-text); display: block; }
.error { background: var(--error-bg); color: var(--error-text); display: block; }

/* Toast notifications */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}
.toast {
  background: #222;
  color: #fff;
  padding: 12px 18px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateX(100%);
  animation: slideIn 0.5s forwards;
}
@keyframes slideIn {
  to { opacity: 1; transform: translateX(0); }
}