/* Courses tab — GitHub fork gate: the modal shown on the first click of a
   Colab section link, offering to point every link at the student's own
   ARENA_3.0 fork. Driven by courses-fork-gate.js. */

.fork-gate-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgb(var(--well-rgb) / calc(0.6 * var(--well-k)));
  backdrop-filter: blur(2px);
}

.fork-gate {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  max-width: 520px;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-sizing: border-box;
}

.fork-gate-title {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}

.fork-gate-blurb {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}

.fork-gate-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.fork-gate-step-num {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--on-accent);
  background: var(--accent);
  border-radius: 50%;
}

.fork-gate-step-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fork-gate-step-text {
  margin: 0;
  font-size: 14px;
  color: var(--text);
}

.fork-gate-fork-btn {
  align-self: flex-start;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.15s ease;
}

.fork-gate-fork-btn:hover {
  border-color: var(--accent-text);
}

.fork-gate-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.fork-gate-input {
  flex: 1;
  min-width: 180px;
  padding: 9px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  box-sizing: border-box;
  transition: border-color 0.15s ease;
}

.fork-gate-input:focus {
  border-color: var(--accent-text);
}

.fork-gate-submit {
  padding: 9px 16px;
  font-size: 14px;
  font-family: inherit;
  font-weight: 500;
  color: var(--on-accent);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.fork-gate-submit:hover {
  opacity: 0.9;
}

.fork-gate-submit:disabled {
  opacity: 0.55;
  cursor: default;
}

.fork-gate-status {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* No dedicated danger token in variables.css; --accent is the palette's red. */
.fork-gate-status-error {
  color: var(--accent-text);
}

.fork-gate-skip {
  align-self: flex-start;
  padding: 0;
  font-size: 13px;
  font-family: inherit;
  color: var(--muted);
  background: none;
  border: none;
  text-decoration: underline;
  cursor: pointer;
}

.fork-gate-skip:hover {
  color: var(--text);
}

.fork-gate-footnote {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}