:root {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 15% 15%, #1b2a3f 0%, #0f1622 45%, #090d13 100%);
  color: #f4f7ff;
  font-family: "Segoe UI", Tahoma, sans-serif;
}

.wrap {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 14px;
}

.panel {
  border-radius: 14px;
  border: 1px solid #23324b;
  background: rgba(9, 13, 21, 0.9);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  padding: 16px;
}

.hidden {
  display: none;
}

h1 {
  margin: 0 0 10px;
  font-size: 1.4rem;
}

p {
  margin: 0;
  color: #b8c3db;
}

.input-row {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

input[type='url'] {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #31435f;
  background: #101826;
  color: #f4f7ff;
  font-size: 0.98rem;
}

button,
.btn {
  border: 0;
  min-height: 44px;
  border-radius: 10px;
  padding: 0 14px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

button {
  background: #22c55e;
  color: #04230f;
}

.hint {
  margin-top: 10px;
  font-size: 0.9rem;
}

code {
  display: inline-block;
  font-size: 0.85rem;
  color: #bfdbfe;
  background: #0a1422;
  border: 1px solid #22324b;
  border-radius: 8px;
  padding: 3px 8px;
}

.reader-header {
  margin-bottom: 12px;
}

.reader-header p {
  margin-top: 6px;
  font-size: 0.9rem;
}

.pages {
  background: #0c111a;
  border: 1px solid #1e2a3d;
  border-radius: 10px;
  overflow: hidden;
}

.page {
  display: block;
  width: 100%;
  min-height: 80px;
  background: #151d2b;
}

.reader-footer {
  margin-top: 14px;
  display: flex;
  justify-content: center;
}

.btn {
  background: #f59e0b;
  color: #2a1b00;
}

.btn.disabled {
  background: #4b5563;
  color: #e5e7eb;
  pointer-events: none;
}

body.reading-mode .wrap {
  max-width: none;
  padding: 0;
}

body.reading-mode #readerPanel {
  border: 0;
  border-radius: 0;
  box-shadow: none;
  padding: 0;
  background: transparent;
}

body.reading-mode .reader-header {
  margin: 0;
  padding: 12px 12px 10px;
}

body.reading-mode .pages {
  width: 100vw;
  margin-left: calc(50% - 50vw);
  border: 0;
  border-radius: 0;
}

body.reading-mode .page {
  width: 100vw;
  margin: 0;
}

body.reading-mode .reader-footer {
  width: 100vw;
  margin: 0 0 0 calc(50% - 50vw);
  padding: 0;
}

body.reading-mode .reader-footer .btn {
  width: 100vw;
  min-height: 72px;
  border-radius: 0;
  font-size: 1.05rem;
}

@media (max-width: 700px) {
  .wrap {
    padding: 10px;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  button {
    width: 100%;
  }
}