:root {
  color-scheme: dark;
  --page-bg: #0D1210;
  --surface: #202823;
  --border: #314139;
  --text: #E3ECE6;
  --muted: #9AA79F;
  --signal: #30C67C;
  --noise: #D85A63;
  --radius: 8px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --font-sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-family: var(--font-sans);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--page-bg);
}

body,
button,
input,
select,
textarea {
  font: inherit;
}

pre,
code,
kbd,
samp,
output {
  font-family: var(--font-mono);
}

::selection {
  background: rgba(48, 198, 124, 0.24);
  color: var(--text);
}

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

a:hover {
  color: var(--text);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transform: translateY(-140%);
  transition: transform 0.2s ease;
  z-index: 20;
}

.skip-link:focus {
  transform: translateY(0);
}

.page-shell,
.container {
  width: min(960px, calc(100vw - 2rem));
  margin-inline: auto;
  padding-block: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.brand-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.brand-mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

h1,
h2,
h3,
p,
dl,
dd,
dt,
ul,
li,
pre {
  margin: 0;
}

h1 {
  font-size: 2rem;
  line-height: 1.15;
}

h2 {
  font-size: 1.25rem;
  line-height: 1.25;
}

h3 {
  font-size: 1rem;
  line-height: 1.3;
}

.lede {
  max-width: 48rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.section-heading {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.section-heading p,
.field-hint,
.inline-note,
.noscript-note,
.status-note,
.progress-text {
  color: var(--muted);
  line-height: 1.5;
}

.upload-form {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.field-group {
  display: grid;
  gap: 0.75rem;
}

.field-group > label:first-child {
  font-weight: 700;
}

.dropzone {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  min-height: 6rem;
  padding: var(--space-3);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.dropzone:hover,
.dropzone.is-dragover,
.dropzone:focus-within {
  border-color: var(--signal);
  color: var(--text);
}

.dropzone-copy {
  display: block;
  font-size: 0.95rem;
}

.sr-only-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.field-feedback,
.error-note {
  min-height: 1.5rem;
}

.field-feedback {
  color: var(--muted);
  font-size: 0.95rem;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.primary-button {
  min-width: 10rem;
  padding: 0.7rem 1.25rem;
  border: 1px solid var(--signal);
  border-radius: var(--radius);
  background: var(--signal);
  color: var(--page-bg);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.primary-button:hover:not(:disabled) {
  background: var(--page-bg);
  color: var(--signal);
}

.primary-button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.inline-note,
.noscript-note {
  max-width: 30rem;
  font-size: 0.95rem;
}

.meta-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.meta-list div {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border);
}

.meta-list dt {
  color: var(--muted);
  font-size: 0.85rem;
}

.meta-list dd {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.progress-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.progress-header output {
  color: var(--signal);
  font-family: var(--font-mono);
  font-weight: 600;
}

.progress-track {
  overflow: hidden;
  height: 0.5rem;
  border-radius: var(--radius);
  background: var(--surface);
}

.progress-fill {
  width: 0;
  height: 100%;
  background: var(--signal);
  transition: width 0.2s ease;
}

.message-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.error-note {
  color: var(--noise);
  font-weight: 600;
}

.error-note:not([hidden]) {
  padding: var(--space-2) var(--space-3);
  border-left: 2px solid var(--noise);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: var(--space-3);
}

.stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat-card dt {
  color: var(--muted);
  font-size: 0.8rem;
}

.stat-card dd {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
}

.downloads-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.download-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: 0;
  margin: 0;
  list-style: none;
}

.download-link {
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  text-decoration: underline;
}

.download-link:hover:not(.is-disabled) {
  color: var(--text);
}

.download-link.is-disabled {
  color: var(--muted);
  cursor: not-allowed;
  text-decoration: line-through;
}

.preview-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.tab-button {
  padding: var(--space-2) 0;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab-button:hover {
  color: var(--text);
}

.tab-button.is-active {
  border-bottom-color: var(--signal);
  color: var(--text);
}

.tab-panel {
  margin-top: var(--space-3);
}

.preview-surface,
.rendered-preview-shell {
  min-height: 22rem;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.preview-surface {
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.rendered-preview-shell {
  overflow: auto;
}

.preview-placeholder {
  color: var(--muted);
  line-height: 1.5;
}

@media (max-width: 640px) {
  .dropzone {
    flex-direction: column;
    text-align: center;
  }

  .form-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .primary-button {
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}