:root {
  --bg: #0b0f14;
  --panel: rgba(255,255,255,0.05);
  --panel-hover: rgba(255,255,255,0.09);
  --border: rgba(255,255,255,0.08);
  --text: #e6e6e6;
  --accent: #00ffcc;
}

body {
  margin: 0;
  font-family: system-ui, Arial;
  color: var(--text);
  padding: 30px;

  min-height: 100vh;
  background: radial-gradient(circle at top, #111827, var(--bg));
  background-attachment: fixed;
}

/* TITRE */
header h1 {
  font-size: 42px;
  text-align: center;
  margin-bottom: 5px;
}

header p {
  text-align: center;
  opacity: 0.6;
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 30px;
}

/* CARDS */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  text-decoration: none;
  color: var(--text);
  transition: 0.25s ease;
  backdrop-filter: blur(10px);
  min-height: 120px;
  animation: fadeIn 0.4s ease;
}

.card:hover {
  transform: translateY(-4px);
  background: var(--panel-hover);
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0,255,204,0.2);
}

.card h2 {
  margin: 0 0 8px 0;
  font-size: 18px;
}

.card p {
  opacity: 0.7;
  font-size: 14px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* INPUT / BUTTON */
input, button {
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #111827;
  color: white;
}

button {
  cursor: pointer;
  margin-top: 10px;
}

button:hover {
  border-color: var(--accent);
}

.back-btn {
  display: inline-block;
  padding: 10px 14px;
  margin-bottom: 15px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #111827;
  color: var(--text);
  text-decoration: none;
  transition: 0.2s;
}

.back-btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* MOBILE FIX */
@media (max-width: 600px) {
  body {
    padding: 15px;
  }

  header h1 {
    font-size: 28px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .card {
    min-height: 90px;
  }

  input, button {
    width: 100%;
  }
}

@media (max-width: 768px) {

  body.tool-page {
    padding: 18px;
  }

  body.tool-page h1 {
    font-size: 34px;
  }

  body.tool-page h2 {
    font-size: 26px;
  }

  body.tool-page p,
  body.tool-page pre,
  body.tool-page span {
    font-size: 20px;
  }

  body.tool-page button {
    font-size: 18px;
    padding: 14px 18px;
    width: 100%;
  }

  body.tool-page input {
    font-size: 18px;
    padding: 14px;
    width: 100%;
    box-sizing: border-box;
  }

  body.tool-page .back-btn {
    font-size: 18px;
    padding: 12px 16px;
  }

  body.tool-page .card {
    padding: 20px;
  }
}

/* COLOR PASSWORD-CHECK */
.weak { color: #ff4d4d; }
.medium { color: #ffb84d; }
.good { color: #4dff88; }
.strong { color: #00ffcc; }