:root {
  --bg: #0a0a0b;
  --bg-elev: #131316;
  --bg-elev-hover: #1a1a1f;
  --fg: #f5f5f7;
  --fg-dim: #9a9aa3;
  --accent: #7c5cff;
  --accent-hover: #8c6dff;
  --danger: #ff5c7c;
  --border: #25252c;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "Inter", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

/* The HTML `hidden` attribute applies `display: none` via the user-agent
 * stylesheet, but a class selector like `.status { display: flex }` has
 * higher specificity and wins, leaving the element visible. Force `hidden`
 * to win so toggling el.hidden in JS actually hides the element. */
[hidden] {
  display: none !important;
}

/* The HTML `hidden` attribute applies `display: none` via the user-agent
 * stylesheet, but a class selector like `.status { display: flex }` has
 * higher specificity and wins, leaving the element visible. Force `hidden`
 * to win so toggling el.hidden in JS actually hides the element. */
[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01", "cv11";
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 80px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

header h1 {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

header .tagline {
  color: var(--fg-dim);
  font-size: 16px;
  margin: 0;
  line-height: 1.5;
}

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg-elev);
  border-radius: 10px;
  border: 1px solid var(--border);
  width: max-content;
}

.tab {
  background: transparent;
  border: none;
  color: var(--fg-dim);
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  border-radius: 7px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

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

.tab--active {
  background: var(--bg);
  color: var(--fg);
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ---------- dropzone ---------- */
.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.05s;
}

.dropzone--compact {
  padding: 32px 24px;
}

.dropzone:hover,
.dropzone:focus-within {
  border-color: var(--accent);
  background: var(--bg-elev-hover);
}

.dropzone.is-dragging {
  border-color: var(--accent);
  background: var(--bg-elev-hover);
  transform: scale(1.005);
}

.dropzone-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.dropzone-headline {
  font-size: 18px;
  font-weight: 500;
  margin: 0;
}

.dropzone-sub {
  color: var(--fg-dim);
  margin: 0;
  font-size: 13px;
}

.dropzone-button {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

.dropzone-button:hover {
  background: var(--accent-hover);
}

.dropzone-formats {
  color: var(--fg-dim);
  font-size: 12px;
  margin: 8px 0 0;
}

.status {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 24px;
  background: var(--bg-elev);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.status p {
  margin: 0;
  color: var(--fg-dim);
}

.spinner {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.result,
.error {
  background: var(--bg-elev);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
}

.result h2,
.error h2 {
  margin: 0 0 24px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.result h2 {
  color: #6cffae;
}

.error h2 {
  color: var(--danger);
}

.error p {
  color: var(--fg-dim);
  margin: 0 0 24px;
}

#manifest-fields {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 12px 24px;
  margin: 0 0 24px;
}

#manifest-fields dt {
  color: var(--fg-dim);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#manifest-fields dd {
  margin: 0;
  font-size: 14px;
  word-break: break-word;
  font-feature-settings: "tnum";
}

.reset-button {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, border-color 0.15s;
}

.reset-button:hover {
  background: var(--bg-elev-hover);
  border-color: var(--accent);
}

/* ---------- sign form ---------- */
.sign-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  color: var(--fg-dim);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.field input[type="text"],
.field select {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 12px 14px;
  font-size: 15px;
  border-radius: 8px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}

.field input[type="text"]:focus,
.field select:focus {
  border-color: var(--accent);
  background: var(--bg-elev-hover);
}

.field input[type="text"]::placeholder {
  color: #555560;
}

.field select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%239a9aa3' d='M6 8L0 0h12z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
  cursor: pointer;
}

.field-help {
  color: var(--fg-dim);
  font-size: 12px;
  margin: 0;
  line-height: 1.5;
}

.primary-button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 14px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}

.primary-button:hover:not(:disabled) {
  background: var(--accent-hover);
}

.primary-button:active:not(:disabled) {
  transform: scale(0.99);
}

.primary-button:disabled {
  background: var(--bg-elev);
  color: #555560;
  cursor: not-allowed;
}

.disclaimer {
  color: var(--fg-dim);
  font-size: 12px;
  line-height: 1.6;
  margin: 0;
  padding: 16px;
  background: var(--bg-elev);
  border-radius: 8px;
  border: 1px solid var(--border);
}

footer {
  color: var(--fg-dim);
  font-size: 12px;
  line-height: 1.6;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

footer p {
  margin: 0;
}