:root {
  --bg: #0f172a;         /* bleu nuit/gris très foncé */
  --panel: #111827;      /* gris charbon bleuté */
  --panel-2: #0b1220;
  --text: #e5e7eb;       /* gris très clair */
  --muted: #9ca3af;      /* gris moyen */
  --accent: #2563eb;     /* bleu */
  --accent-2: #1e40af;   /* bleu foncé */
  --ok: #22c55e;
  --danger: #ef4444;
  --ring: rgba(37, 99, 235, .35);
}

* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
html, body {
  height: 100%;
}

body {
  margin: 0;
font-family: system-ui, -apple-system, "Segoe UI", Roboto, Inter, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% 10%, var(--panel-2), transparent),
              radial-gradient(1400px 900px at 80% 110%, #0a0f1d, transparent),
              var(--bg);
  color: var(--text);
  display: grid;
  place-items: center;
  /* padding: 24px; */
}

.card {
  width: 100%;
  max-width: 460px;
  background: linear-gradient(180deg, var(--panel), #0b1220 60%, #0a0f1d 100%);
  border: 1px solid rgba(255,255,255,.07);
  border-radius: 20px;
  padding: 28px;
  box-shadow:
    0 10px 30px rgba(0,0,0,.35),
    inset 0 1px 0 rgba(255,255,255,.03);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 20px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(37,99,235,.25), rgba(37,99,235,0) 45%, rgba(255,255,255,.05) 55%, rgba(37,99,235,.15));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

.header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid;
  place-items: center;
  color: white;
  font-weight: 800;
  letter-spacing: .5px;
  box-shadow: 0 6px 16px rgba(37, 99, 235, .35);
}

.title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .3px;
}

.subtitle {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}

.form {
  display: grid;
  gap: 14px;
  margin-top: 12px;
}

.label {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.input {
  width: 100%;
  background: #0b1220;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  color: var(--text);
  padding: 12px 14px;
  outline: none;
  transition: border .2s ease, box-shadow .2s ease, transform .03s ease;
}

.input::placeholder {
  color: #6b7280;
}

.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--ring);
}

.row {
  display: grid;
  gap: 6px;
}

.actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 6px;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  user-select: none;
}

.btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  padding: 12px 16px;
  border-radius: 12px;
  font-weight: 600;
  letter-spacing: .2px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 8px 18px rgba(37, 99, 235, .35);
  transition: transform .04s ease, filter .2s ease, box-shadow .2s ease;
}

.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }

.helper {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.footer {
  margin-top: 18px;
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.err {
  background: rgba(239, 68, 68, .10);
  border: 1px solid rgba(239, 68, 68, .35);
  color: #fecaca;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 13px;
  margin-bottom: 10px;
}

.success {
  background: rgba(34, 197, 94, .10);
  border: 1px solid rgba(34, 197, 94, .35);
  color: #bbf7d0;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 13px;
  margin-bottom: 10px;
}

a {
  color: #93c5fd;
  text-decoration: none;
}
a:hover { text-decoration: underline; }