@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700;900&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg:        #f8f9fa;
  --surface:   #ffffff;
  --card:      #ffffff;
  --border:    #dadce0;
  --primary:   #1a73e8;
  --primary-d: #1557b0;
  --accent:    #34a853;
  --success:   #1e8e3e;
  --danger:    #d93025;
  --warn:      #f9ab00;
  --text:      #202124;
  --muted:     #5f6368;
  --radius:    8px;
  --radius-lg: 12px;
  --shadow:    0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
  --shadow-hover: 0 1px 3px 0 rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
  --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Roboto', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* Animated background */
.auth-bg { display: none; }
.auth-bg::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* Card */
.auth-card {
  position: relative; z-index: 1;
  background: var(--surface);
  
  -webkit-
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: 24px;
  padding: 44px 40px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* Logo */
.auth-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.2rem;
  margin-bottom: 36px;
  text-decoration: none; color: var(--text);
}
.auth-logo .logo-icon {
  width: 40px; height: 40px;
  background: var(--primary);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 900; color: white; letter-spacing: -0.5px;
}

/* Tabs */
.auth-tabs {
  display: flex;
  background: var(--surface);
  border-radius: 4px;
  padding: 4px;
  margin-bottom: 32px;
  border: 1px solid var(--border);
}
.auth-tab {
  flex: 1; padding: 9px; border: none; background: none;
  color: var(--muted); font-family: inherit; font-size: 0.9rem;
  font-weight: 600; border-radius: 8px; cursor: pointer;
  transition: all 0.2s;
}
.auth-tab.active { background: var(--primary); color: #ffffff; }

/* Form */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 7px; }
.form-input {
  width: 100%; padding: 12px 14px;
  background: #ffffff; border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text); font-family: inherit; font-size: 0.95rem;
  outline: none; transition: all 0.2s;
}
.form-input::placeholder { color: var(--muted); }
.form-input:focus { border-color: var(--primary);   outline: 1px solid var(--primary); }

/* Submit */
.btn-auth {
  width: 100%; padding: 13px;
  background: var(--primary);
  color: white; border: none; border-radius: 4px;
  font-family: inherit; font-size: 0.97rem; font-weight: 700;
  cursor: pointer; margin-top: 8px;
  transition: all 0.2s;
  box-shadow: none;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-auth:hover { transform: translateY(-1px); box-shadow: var(--shadow-hover); }
.btn-auth:active { transform: scale(0.98); }
.btn-auth:disabled { opacity: 0.6; pointer-events: none; }

/* Divider */
.auth-divider {
  display: flex; align-items: center; gap: 12px;
  color: var(--muted); font-size: 0.82rem; margin: 20px 0;
}
.auth-divider::before, .auth-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

/* Google */
.btn-google {
  width: 100%; padding: 12px;
  background: #ffffff; border: 1px solid var(--border);
  border-radius: 4px; color: #3c4043;
  font-family: inherit; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 10px;
  transition: all 0.2s;
}
.btn-google:hover { background: rgba(0,0,0,0.05); }
.btn-google svg { width: 20px; height: 20px; }

/* Error */
.auth-error {
  background: rgba(248,113,113,0.12); border: 1px solid rgba(248,113,113,0.25);
  color: #f87171; padding: 10px 14px; border-radius: 8px;
  font-size: 0.88rem; margin-bottom: 16px; display: none;
}
.auth-error.show { display: block; }

/* Form panel */
.auth-panel { display: none; }
.auth-panel.active { display: block; }

/* Footer note */
.auth-footer { text-align: center; margin-top: 24px; font-size: 0.85rem; color: var(--muted); }
.auth-footer a { color: var(--primary); }