:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1a1c1f;
  --muted: #656c76;
  --border: #dcdfe4;
  --accent: #2b5bd7;
  --accent-hover: #1f47ad;
  --ok-bg: #e9f7ef;
  --ok-border: #a7d9bd;
  --ok-text: #14532d;
  --err-bg: #fdecec;
  --err-border: #f0b4b4;
  --err-text: #7f1d1d;
  --code-bg: #f0f1f4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --card: #1e2126;
    --text: #e8eaed;
    --muted: #9aa2ad;
    --border: #343941;
    --accent: #6b8dfa;
    --accent-hover: #85a1ff;
    --ok-bg: #16301f;
    --ok-border: #2f6b45;
    --ok-text: #b7e8c9;
    --err-bg: #341a1a;
    --err-border: #7a3535;
    --err-text: #f5b8b8;
    --code-bg: #2a2e35;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 3rem 1.25rem;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
}

.card {
  width: 100%;
  max-width: 34rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.05);
}

/* The login form has two short fields and reads better narrower. */
.card--narrow { max-width: 24rem; }

/* Signed-in bar above the header: username on the left, sign-out on the right. */
.session-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}

.session-bar__form { margin: 0; }

/* Sign-out is a form button but should not look like the primary action. */
.link-button {
  width: auto;
  padding: 0.2rem 0.4rem;
  background: none;
  color: var(--accent);
  border: 0;
  border-radius: 6px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.link-button:hover:not(:disabled) {
  background: var(--code-bg);
  text-decoration: underline;
}

/* Login failures, rate-limit notices and expired-form warnings. */
.form-error {
  margin: 0 0 1.25rem;
  padding: 0.7rem 0.85rem;
  background: var(--err-bg);
  border: 1px solid var(--err-border);
  border-radius: 8px;
  color: var(--err-text);
  font-size: 0.875rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.card__header {
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

code {
  background: var(--code-bg);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
  word-break: break-all;
}

.field { margin-bottom: 1.25rem; }

label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

input[type="file"],
input[type="datetime-local"],
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.6rem 0.7rem;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

input[type="file"]::file-selector-button {
  margin-right: 0.75rem;
  padding: 0.35rem 0.7rem;
  background: var(--code-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  cursor: pointer;
}

input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.hint {
  margin: 0.4rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

button {
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

button:hover:not(:disabled) { background: var(--accent-hover); }
button:disabled { opacity: 0.6; cursor: progress; }

.status {
  margin-top: 1.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 0.875rem;
  display: none;
}

.status.is-visible { display: block; }

.status.is-success {
  background: var(--ok-bg);
  border-color: var(--ok-border);
  color: var(--ok-text);
}

.status.is-error {
  background: var(--err-bg);
  border-color: var(--err-border);
  color: var(--err-text);
}

.status.is-working {
  background: var(--code-bg);
  border-color: var(--border);
  color: var(--muted);
}

.status strong { display: block; margin-bottom: 0.35rem; }

.status dl {
  margin: 0.6rem 0 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.75rem;
  font-size: 0.82rem;
}

.status dt { color: inherit; opacity: 0.8; white-space: nowrap; }
.status dd { margin: 0; }