:root {
  color-scheme: light;
  --font-sans: system-ui, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --page-bg: #f4f5f7;
  --page-text: #171717;
  --muted-text: #666c75;
  --content-bg: #fbfbfc;
  --surface-bg: #ffffff;
  --surface-subtle: #f7f7f8;
  --primary-color: #2563eb;
  --primary-soft: #eff6ff;
  --link-color: #1f4fd1;
  --header-text-color: #111827;
  --flash-bg: #eff6ff;
  --flash-border: #bfdbfe;
  --flash-text: #1e3a8a;
  --input-bg: #ffffff;
  --input-text: #111827;
  --input-border: #d7dbe1;
  --button-bg: #ffffff;
  --button-text: #111827;
  --button-primary-bg: #2f3742;
  --button-primary-hover: #3a4350;
  --button-primary-text: #ffffff;
  --submit-bg: #111827;
  --submit-text: #ffffff;
  --danger-text: #c63c37;
  --enabled-text: #1f7a52;
  --disabled-text: #7b8088;
  --app-img-bg: #0b0c0f;
  --app-img-border: #d7dbe1;
  --select-bg: #ffffff;
  --select-text: #111827;
  --select-border: #d7dbe1;
  --border-color: #e3e6ea;
  --shadow-color: rgba(15, 23, 42, 0.06);
  --shadow-strong: rgba(15, 23, 42, 0.12);
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --page-bg: #111315;
  --page-text: #f5f7fa;
  --muted-text: #a5adb8;
  --content-bg: #17191c;
  --surface-bg: #1c1f23;
  --surface-subtle: #22262b;
  --primary-color: #76a8ff;
  --primary-soft: rgba(118, 168, 255, 0.14);
  --link-color: #8db5ff;
  --header-text-color: #f5f7fa;
  --flash-bg: rgba(118, 168, 255, 0.14);
  --flash-border: rgba(118, 168, 255, 0.35);
  --flash-text: #dce8ff;
  --input-bg: #15181c;
  --input-text: #f5f7fa;
  --input-border: #353b44;
  --button-bg: #20242a;
  --button-text: #f5f7fa;
  --button-primary-bg: #c8d0da;
  --button-primary-hover: #d9e0ea;
  --button-primary-text: #111315;
  --submit-bg: #c8d0da;
  --submit-text: #111315;
  --danger-text: #ff8c86;
  --enabled-text: #72c596;
  --disabled-text: #9aa3af;
  --app-img-border: #353b44;
  --select-bg: #15181c;
  --select-text: #f5f7fa;
  --select-border: #353b44;
  --border-color: #2c3138;
  --shadow-color: rgba(0, 0, 0, 0.22);
  --shadow-strong: rgba(0, 0, 0, 0.36);
}

html {
  font-family: var(--font-sans);
  background: linear-gradient(180deg, var(--page-bg) 0%, var(--content-bg) 100%);
  color: var(--page-text);
  padding: 1rem;
}

body {
  max-width: 1080px;
  margin: 0 auto;
  background: transparent;
  color: var(--page-text);
  font-family: var(--font-sans);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  color: var(--header-text-color);
  letter-spacing: normal;
}

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 2.4vw, 2.3rem);
  line-height: 1.08;
}

h2 {
  font-size: 1.1rem;
  line-height: 1.2;
}

h3 {
  font-size: 0.98rem;
  line-height: 1.25;
}

a {
  color: var(--link-color);
}

hr {
  border: none;
  border-top: 1px solid var(--border-color);
}

nav {
  background: color-mix(in srgb, var(--surface-bg) 88%, transparent);
  backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px var(--shadow-color);
}

nav h1 {
  flex: auto;
  margin: 0;
  font-size: 1.1rem;
}

nav h1 a {
  text-decoration: none;
  color: var(--header-text-color);
}

nav ul {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
}

nav ul li a,
nav ul li span,
nav header .action {
  display: block;
  padding: 0.55rem 0.75rem;
  color: var(--muted-text);
  text-decoration: none;
  border-radius: 999px;
}

nav ul li a:hover {
  background: var(--surface-subtle);
  color: var(--page-text);
}

.content {
  padding: 1.25rem 0 1rem;
}

.content > header {
  display: flex;
  align-items: flex-end;
}

.flash {
  margin: 0 0 1rem;
  padding: 0.9rem 1rem;
  background: var(--flash-bg);
  border: 1px solid var(--flash-border);
  border-radius: var(--radius-md);
  color: var(--flash-text);
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

.post > header {
  display: flex;
  align-items: flex-end;
  font-size: 0.85em;
}

.post > header > div:first-of-type {
  flex: auto;
}

.post .about {
  color: var(--muted-text);
  font-style: italic;
}

.post .body {
  white-space: pre-line;
}

.content form {
  margin: 0;
  display: flex;
  flex-direction: column;
}

.content label {
  font-weight: 600;
  margin-bottom: 0.4em;
  color: var(--page-text);
}

.content input,
.content button,
.content textarea,
.content select {
  background: var(--input-bg);
  color: var(--input-text);
  border: 1px solid var(--input-border);
  padding: 0.65rem 0.8rem;
  border-radius: var(--radius-sm);
  font: inherit;
}

.content input:focus,
.content textarea:focus,
.content select:focus,
.content button:focus-visible {
  outline: none;
  border-color: color-mix(in srgb, var(--primary-color) 45%, var(--input-border));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 16%, transparent);
}

.content textarea {
  min-height: 10em;
  resize: vertical;
}

.content input[type="checkbox"],
.content input[type="radio"] {
  width: auto;
  margin: 0;
  padding: 0;
  background: initial;
  border: initial;
  appearance: auto;
  -webkit-appearance: auto;
  box-shadow: none;
}

.text-enabled {
  color: var(--enabled-text);
}

.text-disabled {
  color: var(--disabled-text);
}

.app-img {
  position: relative;
  background: var(--app-img-bg);
  overflow: hidden;
  border: 1px solid var(--app-img-border);
  border-radius: 12px;
}

.app-img img {
  aspect-ratio: 2 / 1;
  background: var(--app-img-bg);
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
  -webkit-mask-image: url('/dots');
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-image: url('/dots');
  mask-repeat: no-repeat;
  mask-size: contain;
  width: 100%;
  height: 100%;
}

.app-img.is-2x img {
  -webkit-mask-image: url('/dots?w=128&h=64&r=0.4');
  mask-image: url('/dots?w=128&h=64&r=0.4');
}

.skeleton-loader {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent 15%, rgba(255, 255, 255, 0.18) 50%, transparent 85%);
  background-size: 200% 100%;
  animation: loading 1.4s infinite;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.app-img img.loaded + .skeleton-loader {
  display: none;
}

.theme-toggle-container {
  display: inline-block;
  list-style-type: none;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  margin-left: 6px;
  padding: 0.2rem 0.3rem;
}

.theme-toggle label {
  margin-right: 6px;
  font-size: 0.9em;
  color: var(--muted-text);
}

.theme-toggle select {
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--select-border);
  background-color: var(--select-bg);
  font-size: 0.9em;
  color: var(--select-text);
}