/* ================= ROOT SYSTEM ================= */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --secondary: #202124;
  --bg: #f8f9fa;
  --text: #3c4043;
  --card: #ffffff;
  --success: #34a853;
  --warning: #fbbc04;
  --danger: #ea4335;

  --gradient: linear-gradient(135deg, #1a73e8, #4fc3f7);
  --gradient-soft: linear-gradient(180deg, rgba(26,115,232,.08), rgba(79,195,247,.02));

  --shadow-lg: 0 30px 70px rgba(0,0,0,.12);
  --shadow-md: 0 18px 40px rgba(0,0,0,.1);

  --radius: 14px;
  --radius-sm: 10px;

  --transition: all .3s ease;
}

* {
  box-sizing: border-box;
  font-family: "Inter", system-ui, sans-serif;
}

body {
  margin: 0;
  background: var(--bg);
  min-height: 100vh;
  display: grid;
  place-items: center;
}

/* ================= AUTH WRAPPER ================= */
.auth-wrapper {
  width: 100%;
  padding: 20px;
}

.auth-card {
  max-width: 420px;
  margin: auto;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  animation: fadeUp .6s ease;
}

.invalid-feedback {
  font-size: 13px;
  color: var(--danger);
  margin-top: 4px;
}

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

/* ================= HEADER ================= */
.auth-header {
  text-align: center;
  margin-bottom: 28px;
}

.auth-header h2 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  color: var(--secondary);
}

.auth-header p {
  font-size: 14px;
  color: #5f6368;
}

/* ================= FORM ================= */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: #5f6368;
  margin-bottom: 6px;
  display: block;
}

.input-icon {
  position: relative;
}

.input-icon i {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary);
  font-size: 18px;
}

.input-icon input {
  width: 100%;
  height: 46px;
  padding: 0 14px 0 42px;
  border-radius: var(--radius-sm);
  border: 2px solid #e8eaed;
  font-size: 14px;
  transition: var(--transition);
}

.input-icon input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(26,115,232,.1);
  outline: none;
}

/* ================= BUTTON ================= */
.btn-auth {
  width: 100%;
  height: 48px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--gradient);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: var(--transition);
}

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

/* ================= FOOTER ================= */
.auth-footer {
  text-align: center;
  margin-top: 22px;
  font-size: 14px;
}

.auth-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.auth-footer a:hover {
  text-decoration: underline;
}

/* ================= RESPONSIVE ================= */
@media (max-width: 480px) {
  .auth-card {
    padding: 26px;
  }
}