:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --secondary: #6366f1;
  --accent: #8b5cf6;

  --bg: #0f172a;
  --bg-secondary: #020617;

  --card: rgba(30, 41, 59, 0.88);
  --card-hover: rgba(51, 65, 85, 0.95);

  --input: rgba(51, 65, 85, 0.9);
  --input-focus: rgba(71, 85, 105, 1);

  --text: #f8fafc;
  --text-muted: #94a3b8;

  --border: rgba(148, 163, 184, 0.18);
  --border-light: rgba(203, 213, 225, 0.3);

  --error: #ef4444;

  --shadow-lg: 0 25px 50px -12px rgba(0,0,0,.5);
  --shadow-md: 0 12px 24px rgba(0,0,0,.4);
}

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

body {
  font-family: 'Poppins', system-ui, sans-serif;
  background: radial-gradient(circle at top, #020617, #000);
  color: var(--text);
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* INPUT GLOBAL */
input {
  width: 100%;
  padding: 18px 14px;
  border-radius: 10px;
  background: var(--input);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
  transition: .25s ease;
}

input:focus {
  background: var(--input-focus);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.25);
  outline: none;
}

/* BUTTON */
.login-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  color: white;
  padding: 16px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: .25s ease;
}

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