:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f6f7f9;
  --text: #17191c;
  --muted: #626972;
  --line: #d9dde3;
  --accent: #002145;
  --accent-text: #ffffff;
  --danger: #9c1c1c;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111315;
    --surface: #191c20;
    --text: #f1f3f5;
    --muted: #aab0b7;
    --line: #343a40;
    --accent: #173f69;
    --accent-text: #ffffff;
    --danger: #ff8f8f;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}
a { color: inherit; text-underline-offset: 2px; }
.page-shell { width: min(900px, calc(100% - 28px)); margin: 14px auto 48px; }
.support-strip { display: flex; flex-wrap: wrap; gap: 6px 20px; padding: 8px 0 12px; font-size: .88rem; color: var(--muted); }
.hero { background: var(--accent); color: var(--accent-text); padding: 24px; text-align: center; margin-bottom: 24px; }
.hero h1 { margin: 0; font-size: clamp(1.7rem, 5vw, 2.25rem); }
.control-block, .primary-settings, .output, .about, .advanced { margin-bottom: 20px; }
.field-label, legend { display: block; font-weight: 700; margin-bottom: 7px; }
fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
input[type="text"], textarea, input[type="file"] {
  width: 100%;
  font: inherit;
}
input[type="text"], textarea {
  padding: 10px 11px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
}
#separator { width: 5rem; }
textarea { resize: vertical; }
.field-help { margin: 6px 0 0; color: var(--muted); font-size: .9rem; }
.primary-settings {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, .7fr);
  gap: 24px;
  padding: 16px;
  border: 1px solid var(--line);
}
.inline-options { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.action-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 18px; }
button {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 9px 14px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button.secondary { background: var(--surface); color: var(--text); }
.help-links { margin-left: 4px; font-size: .9rem; color: var(--muted); }
.advanced { border: 1px solid var(--line); }
.advanced > summary { cursor: pointer; font-weight: 700; padding: 12px 14px; background: var(--surface); }
.advanced-body { padding: 16px; }
.rule-panel { display: grid; gap: 9px; }
.rule-option { display: grid; grid-template-columns: auto 1fr; gap: 9px; align-items: start; }
.rule-option input { margin-top: .3em; }
.hidden { display: none !important; }
.wordlist-section { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); }
.wordlist-section h2 { margin: 0 0 10px; font-size: 1rem; }
.file-label { display: block; font-weight: 650; margin-bottom: 7px; }
.wordlist-section button { margin-top: 10px; }
.output { border: 1px solid var(--line); padding: 16px; display: grid; gap: 16px; }
.echo { margin-top: 4px; }
.output textarea { margin-top: 6px; }
.error { color: var(--danger); font-weight: 650; }
.about { border-top: 1px solid var(--line); padding-top: 22px; }
.about h2 { font-size: 1.16rem; margin: 24px 0 8px; }
.about h2:first-child { margin-top: 0; }
.about p { margin: 0 0 12px; }
footer { border-top: 1px solid var(--line); padding-top: 16px; display: flex; justify-content: center; gap: 9px; color: var(--muted); font-size: .9rem; }

@media (max-width: 650px) {
  .primary-settings { grid-template-columns: 1fr; gap: 16px; }
  .page-shell { width: min(100% - 20px, 900px); }
}

/* Donation notice */

.donation-modal {
    position: fixed;
    inset: 0;
    z-index: 10000;

    display: none;
    align-items: center;
    justify-content: center;

    padding: 20px;
}

.donation-modal.is-visible {
    display: flex;
}

.donation-modal__backdrop {
    position: absolute;
    inset: 0;

    background: rgba(0, 0, 0, 0.42);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.donation-modal__card {
    position: relative;
    z-index: 1;

    width: min(440px, 100%);
    padding: 30px;

    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.28);

    text-align: center;
}

.donation-modal__card h2 {
    margin: 0 0 14px;

    color: var(--text);
    font-size: 1.5rem;
}

.donation-modal__card p {
    margin: 0 0 22px;
    line-height: 1.6;
}

.donation-modal__donate {
    display: block;

    margin-bottom: 12px;
    padding: 11px 18px;

    border-radius: 7px;
    background: var(--accent);
    color: var(--accent-text);

    font-weight: 600;
    text-decoration: none;
}

.donation-modal__donate:hover {
    opacity: 0.9;
}

.donation-modal__continue {
    width: 100%;
    padding: 10px 18px;

    border: 1px solid var(--line);
    border-radius: 7px;
    background: var(--surface);
    color: var(--text);

    cursor: pointer;
}

.donation-modal__close {
    position: absolute;
    top: 8px;
    right: 12px;

    border: 0;
    background: transparent;

    color: var(--muted);
    font-size: 1.6rem;
    line-height: 1;

    cursor: pointer;
}