:root {
  color-scheme: light;
  --page: #f4f1fa;
  --surface: #ffffff;
  --text: #17171c;
  --muted: #595466;
  --field: #f1eef7;
  --border: #ddd5ed;
  --accent: #7c3aed;
  --accent-hover: #6527d5;
  --panel-start: #7c3aed;
  --panel-end: #5420a2;
  --shadow: 0 20px 55px rgba(34, 18, 62, 0.17);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --page: #0a0a0d;
  --surface: #17171c;
  --text: #ffffff;
  --muted: #c0b9ce;
  --field: #24232c;
  --border: #3b3349;
  --accent: #7c3aed;
  --accent-hover: #9255f5;
  --panel-start: #7c3aed;
  --panel-end: #4b188f;
  --shadow: 0 22px 60px rgba(0, 0, 0, 0.42);
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, -apple-system, Arial, sans-serif; }
body {
  min-height: 100vh;
  min-height: 100dvh;
  padding: 35px 18px 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 22px;
  background: radial-gradient(ellipse at 15% 15%, rgba(124, 58, 237, .12), transparent 52%),
              radial-gradient(ellipse at 85% 90%, rgba(124, 58, 237, .07), transparent 52%),
              var(--page);
  color: var(--text);
  transition: color .2s ease;
}
button, input { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* Compact theme control inside the footer; never floats over the auth card. */
.theme-toggle {
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--accent);
  transition: background-color .2s, border-color .2s, transform .2s;
}
.theme-toggle:hover { border-color: var(--accent); background: var(--field); transform: translateY(-1px); }
.theme-toggle svg { width: 19px; height: 19px; }
.theme-toggle .theme-sun { display: none; }
html[data-theme="dark"] .theme-toggle .theme-moon { display: none; }
html[data-theme="dark"] .theme-toggle .theme-sun { display: block; }

.container {
  background: var(--surface);
  border-radius: 30px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  width: 830px;
  max-width: 100%;
  min-height: 510px;
  transition: background-color .2s ease;
}
.container p { font-size: 14px; line-height: 1.7; letter-spacing: .15px; }
.container h1 { font-size: clamp(22px, 2.6vw, 31px); line-height: 1.2; font-weight: 800; letter-spacing: -.9px; }
.container button:not(.icon):not(.forgot-password) {
  background-color: var(--accent);
  color: #fff;
  font-size: 13px;
  padding: 12px 42px;
  border: 1px solid transparent;
  border-radius: 9px;
  letter-spacing: .5px;
  font-weight: 700;
  text-transform: uppercase;
  margin-top: 14px;
  transition: background-color .2s ease, transform .2s ease;
}
.container button:not(.icon):not(.forgot-password):hover { background-color: var(--accent-hover); }
.container button:not(.icon):not(.forgot-password):active { transform: scale(.98); }
.container button.hidden:not(.icon):not(.forgot-password) { background: transparent; border: 1px solid rgba(255,255,255,.9); }
.container button.hidden:hover { background: rgba(255,255,255,.14) !important; }
.container form {
  background-color: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 30px 42px;
  height: 100%;
  transition: background-color .2s ease;
}
.form-description { color: var(--muted); font-size: 12px; text-align: center; margin-bottom: 15px; line-height: 1.5; }
.container input {
  background-color: var(--field);
  border: 1px solid transparent;
  margin: 6px 0;
  padding: 12px 14px;
  font-size: 14px;
  border-radius: 8px;
  color: var(--text);
  width: 100%;
  min-height: 42px;
}
.container input::placeholder { color: var(--muted); opacity: 1; }
.container input:hover { border-color: var(--border); }
.container input:focus { border-color: var(--accent); }
.form-container { position: absolute; top: 0; height: 100%; transition: all .6s ease-in-out; }
.sign-in { left: 0; width: 50%; z-index: 2; }
.container.active .sign-in { transform: translateX(100%); }
.sign-up { left: 0; width: 50%; opacity: 0; z-index: 1; pointer-events: none; }
.container.active .sign-up { transform: translateX(100%); opacity: 1; z-index: 5; animation: move .6s; pointer-events: auto; }
.container.active .sign-in { pointer-events: none; }
@keyframes move { 0%, 49.99% { opacity: 0; z-index: 1; } 50%, 100% { opacity: 1; z-index: 5; } }
.social-icons { display: flex; gap: 9px; margin: 20px 0; }
.social-icons .icon {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  font-size: 14px;
  font-weight: 800;
  transition: border-color .2s ease, color .2s ease;
}
.social-icons .social-fallback { display: block; width: 19px; height: 19px; fill: currentColor; }
.social-icons .icon:hover { border-color: var(--accent); color: var(--accent); }
.forgot-password { color: var(--muted); background: none; border: none; padding: 9px; margin-top: 6px; font-size: 12px; }
.forgot-password:hover { color: var(--accent); text-decoration: underline; }
.form-status { min-height: 22px; margin-top: 10px; color: var(--muted); font-size: 12px !important; text-align: center; }
/* Explicit, low-emphasis demo disclosure: visible before users type credentials. */
.demo-notice { display: flex; align-items: center; justify-content: center; gap: 6px; margin-top: 9px; color: var(--muted); font-size: 11px !important; font-weight: 600; letter-spacing: .15px; text-align: center; }
.demo-notice > span:first-child { color: var(--accent); font-size: 10px; }
.demo-separator { color: var(--accent); }
.container h1:focus { outline: none; }
.container h1:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
.toggle-container {
  position: absolute;
  top: 0;
  left: 50%;
  width: 50%;
  height: 100%;
  overflow: hidden;
  transition: all .6s ease-in-out;
  border-radius: 150px 0 0 150px;
  z-index: 10;
}
.container.active .toggle-container { transform: translateX(-100%); border-radius: 0 150px 150px 0; }
.toggle {
  background: linear-gradient(130deg, var(--panel-start), var(--panel-end));
  height: 100%;
  color: #fff;
  position: relative;
  left: -100%;
  width: 200%;
  transform: translateX(0);
  transition: all .6s ease-in-out;
}
.container.active .toggle { transform: translateX(50%); }
.toggle-panel {
  position: absolute;
  display: flex;
  width: 50%;
  height: 100%;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 0 32px;
  text-align: center;
  top: 0;
  transform: translateX(0);
  transition: all .6s ease-in-out;
}
.toggle-panel p { margin: 20px 0 12px; max-width: 270px; }
.toggle-left { transform: translateX(-200%); }
.container.active .toggle-left { transform: translateX(0); }
.toggle-right { right: 0; transform: translateX(0); }
.container.active .toggle-right { transform: translateX(200%); }
/* Clear project authorship and a discreet theme action. */
.site-footer {
  width: 830px;
  max-width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 5px;
}
.developer-credit { display: flex; gap: 12px; align-items: center; min-width: 0; }
.credit-mark {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: var(--accent);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -2px;
  flex-shrink: 0;
}
.credit-text { display: flex; flex-direction: column; gap: 2px; line-height: 1.35; }
.credit-text > span { font-size: 11px; font-weight: 500; color: var(--muted); }
.credit-text strong { font-size: 13px; font-weight: 800; letter-spacing: .1px; color: var(--text); }
.credit-text small { font-size: 10px; letter-spacing: 1.9px; font-weight: 700; color: var(--muted); }
.credit-text small span { color: var(--accent); padding: 0 3px; }

@media (max-width: 700px) {
  /* Center the entire card + credit on tall phones. When content is taller
     than the viewport, min-height lets the document grow and scroll. */
  body { padding: 25px 15px 26px; justify-content: center; }
  .container { display: flex; flex-direction: column; width: min(450px, 100%); min-height: 0; border-radius: 24px; }
  .form-container, .sign-in, .sign-up {
    position: relative;
    inset: auto;
    width: 100%;
    height: auto;
    opacity: 1;
    transform: none !important;
    animation: none !important;
    transition: none;
  }
  .sign-up { display: none; }
  .container.active .sign-up { display: block; }
  .container.active .sign-in { display: none; }
  .container form { padding: 28px 26px 24px; }
  .toggle-container, .container.active .toggle-container {
    position: relative;
    order: -1;
    inset: auto;
    width: 100%;
    height: auto;
    min-height: 174px;
    overflow: visible;
    transform: none;
    transition: none;
    border-radius: 0;
  }
  .toggle, .container.active .toggle {
    left: auto;
    width: 100%;
    height: 100%;
    min-height: 174px;
    transform: none;
    transition: none;
    border-radius: 24px 24px 20px 20px;
  }
  .toggle-panel, .container.active .toggle-panel {
    position: relative;
    inset: auto;
    height: auto;
    min-height: 174px;
    width: 100%;
    padding: 22px 22px;
    transform: none;
    transition: none;
  }
  .toggle-left { display: none; }
  .container.active .toggle-left { display: flex; }
  .container.active .toggle-right { display: none; }
  .toggle-panel h1 { font-size: 24px; }
  .toggle-panel p { font-size: 12px; margin: 9px 0 3px; }
  .toggle-panel button.hidden { margin-top: 8px !important; padding: 10px 32px !important; }
  .site-footer { width: min(450px, 100%); gap: 12px; padding: 0 2px; }
  .credit-text small { font-size: 10px; letter-spacing: 1.1px; }
}
@media (max-width: 370px) {
  .container form { padding: 25px 17px 20px; }
  .social-icons { gap: 6px; }
  .social-icons .icon { width: 42px; height: 42px; }
  .credit-mark { width: 36px; height: 36px; }
  .credit-text strong { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}