:root {
  color-scheme: light dark;
  --gap: 1rem;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --color-bg: #f7f7f9;
  --color-surface: #ffffff;
  --color-border: #e2e2e7;
  --color-text: #1a1a1f;
  --color-text-muted: #62626b;
  --color-accent: #4f46e5;
  --color-accent-hover: #4338ca;
  --color-accent-ring: rgba(79, 70, 229, 0.25);
  --color-danger: #b91c1c;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f0f13;
    --color-surface: #1a1a20;
    --color-border: #2c2c34;
    --color-text: #f2f2f5;
    --color-text-muted: #9a9aa5;
    --color-accent: #818cf8;
    --color-accent-hover: #a5b4fc;
    --color-accent-ring: rgba(129, 140, 248, 0.35);
    --color-danger: #f87171;
    --color-danger-bg: #2c1414;
    --color-danger-border: #7f1d1d;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  background: var(--color-bg);
  color: var(--color-text);
}

h1, h2, h3 {
  line-height: 1.25;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 1.25rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 1rem var(--gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.site-header .brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.9rem;
}

.site-nav__logout {
  margin: 0;
  display: inline;
}

.btn-link {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  color: var(--color-accent);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 400;
  cursor: pointer;
}

.btn-link:hover {
  text-decoration: underline;
  background: none;
}

.app {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: var(--gap);
}

.auth-page {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--gap);
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
}

.card--wide {
  max-width: 640px;
  margin: 0 auto;
}

textarea {
  resize: vertical;
}

label {
  display: block;
  margin-bottom: 1.1rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.6rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus-visible,
input[type="email"]:focus-visible,
input[type="password"]:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-ring);
}

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.05s ease;
}

button:hover,
.btn:hover {
  background: var(--color-accent-hover);
}

button:active,
.btn:active {
  transform: translateY(1px);
}

button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

button:disabled,
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

[role="alert"] {
  background: var(--color-danger-bg);
  border: 1px solid var(--color-danger-border);
  color: var(--color-danger);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

[data-ui-mode="low_stim"] {
  --gap: 1.5rem;
}

[data-ui-mode="low_stim"] * {
  animation: none !important;
  transition: none !important;
}

.idea-card {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.idea-card:last-child {
  border-bottom: none;
}

.idea-card h2 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0 0 1.1rem;
}

fieldset legend {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0;
  margin-bottom: 0.4rem;
}

fieldset label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  width: auto;
  margin: 0 1.25rem 0 0;
  font-weight: 400;
  color: var(--color-text);
}

fieldset input[type="radio"] {
  width: auto;
  margin: 0;
}