:root {
  --color-primary: #0f6e56;
  --color-primary-contrast: #ffffff;
  --color-text: #1b1f23;
  --color-muted: #57606a;
  --color-surface: #ffffff;
  --color-background: #f3f5f4;
  --color-border: #c9d1cd;
  --color-danger: #b42318;
  --color-success: #0f6e56;
  --radius: 8px;
  font-family: "IBM Plex Sans Arabic", "Segoe UI", Tahoma, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #e6edf3;
    --color-muted: #9da7b1;
    --color-surface: #161b22;
    --color-background: #0d1117;
    --color-border: #30363d;
    --color-primary: #3fb68b;
    --color-primary-contrast: #0d1117;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--color-background);
  color: var(--color-text);
  padding: 16px;
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.card__header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.brand { font-weight: 600; color: var(--color-primary); }
.lang { color: var(--color-muted); }
h1 { font-size: 1.4rem; margin: 8px 0 16px; }
form { display: grid; gap: 8px; }
label { font-weight: 500; margin-top: 8px; }

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font: inherit;
  background: transparent;
  color: inherit;
}

input:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 2px; }

button {
  margin-top: 16px;
  padding: 12px;
  border: 0;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.alert { color: var(--color-danger); border: 1px solid var(--color-danger); border-radius: var(--radius); padding: 8px 12px; }
.success { color: var(--color-success); }
.hint { color: var(--color-muted); }

/* Carrier self-registration (PR-01.1): a longer form grouped in sections. */
fieldset { border: 1px solid var(--color-border); border-radius: var(--radius); padding: 8px 12px 12px; margin: 8px 0 0; display: grid; gap: 4px; }
legend { font-weight: 600; padding-inline: 4px; }
input[aria-invalid="true"] { border-color: var(--color-danger); }
.links { margin-top: 16px; text-align: center; }