/* ===== Theme Variables ===== */
:root {
  --bg: #fafafa;
  --card-bg: #fff;
  --text: #111;
  --text-muted: #888;
  --border: #e5e5e5;
  --input-bg: #fff;
  --input-focus-border: #0070f3;
  --input-focus-shadow: rgba(0,112,243,.2);
  --btn-primary-bg: #0070f3;
  --btn-primary-bg-hover: #0060df;
  --btn-primary-text: #fff;
  --btn-oidc-bg: #fff;
  --btn-oidc-bg-hover: #f5f5f5;
  --btn-oidc-text: #111;
  --card-shadow: rgba(0,0,0,.08);
  --toggle-bg: transparent;
  --toggle-text: #666;
  --toggle-hover-bg: rgba(0,0,0,.06);
  --error-bg: #fef2f2;
  --error-text: #991b1b;
  --error-border: #fecaca;
}

/* System dark preference (auto) — only when no manual override */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111;
    --card-bg: #1a1a1a;
    --text: #ededed;
    --text-muted: #999;
    --border: #333;
    --input-bg: #222;
    --input-focus-border: #0070f3;
    --input-focus-shadow: rgba(0,112,243,.3);
    --btn-primary-bg: #0070f3;
    --btn-primary-bg-hover: #0060df;
    --btn-primary-text: #fff;
    --btn-oidc-bg: #222;
    --btn-oidc-bg-hover: #2a2a2a;
    --btn-oidc-text: #ededed;
    --card-shadow: rgba(0,0,0,.3);
    --toggle-bg: transparent;
    --toggle-text: #aaa;
    --toggle-hover-bg: rgba(255,255,255,.08);
    --error-bg: #3b1111;
    --error-text: #fca5a5;
    --error-border: #5c1d1d;
  }
}

/* Manual dark override */
[data-theme="dark"] {
  --bg: #111;
  --card-bg: #1a1a1a;
  --text: #ededed;
  --text-muted: #999;
  --border: #333;
  --input-bg: #222;
  --input-focus-border: #0070f3;
  --input-focus-shadow: rgba(0,112,243,.3);
  --btn-primary-bg: #0070f3;
  --btn-primary-bg-hover: #0060df;
  --btn-primary-text: #fff;
  --btn-oidc-bg: #222;
  --btn-oidc-bg-hover: #2a2a2a;
  --btn-oidc-text: #ededed;
  --card-shadow: rgba(0,0,0,.3);
  --toggle-bg: transparent;
  --toggle-text: #aaa;
  --toggle-hover-bg: rgba(255,255,255,.08);
  --error-bg: #3b1111;
  --error-text: #fca5a5;
  --error-border: #5c1d1d;
}

/* ===== Base Styles ===== */
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  transition: background 0.2s, color 0.2s;
}
.card {
  width: 100%;
  max-width: 360px;
  padding: 2rem;
  background: var(--card-bg);
  border-radius: 8px;
  box-shadow: 0 1px 3px var(--card-shadow);
  transition: background 0.2s, box-shadow 0.2s;
}
h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
  text-align: center;
}
form { margin-bottom: 1rem; }
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 1rem;
  background: var(--input-bg);
  color: var(--text);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 2px var(--input-focus-shadow);
}
button {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--btn-primary-bg-hover); }
.btn-oidc {
  display: block;
  background: var(--btn-oidc-bg);
  color: var(--btn-oidc-text);
  border: 1px solid var(--border);
  margin-top: 0.5rem;
  text-align: center;
  text-decoration: none;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  box-sizing: border-box;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.btn-oidc:hover { background: var(--btn-oidc-bg-hover); }
.divider {
  text-align: center;
  margin: 1rem 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===== Error Message ===== */
.error-msg {
  background: var(--error-bg);
  color: var(--error-text);
  border: 1px solid var(--error-border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  text-align: center;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--toggle-bg);
  color: var(--toggle-text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  line-height: 1;
  z-index: 100;
}
.theme-toggle:hover {
  background: var(--toggle-hover-bg);
}