:root {
  --bg: #0b1020;
  --bg2: #111831;
  --card: rgba(255, 255, 255, 0.045);
  --border: rgba(255, 255, 255, 0.1);
  --text: #e8ebf5;
  --muted: #9aa4c0;
  --accent: #6d7cff;
  --accent2: #00c2a8;
  --danger: #ff5b6e;
  --radius: 16px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(109, 124, 255, 0.22), transparent 60%),
    radial-gradient(800px 450px at 90% 0%, rgba(0, 194, 168, 0.16), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
}
a { color: #aebaff; }
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px clamp(16px, 4vw, 48px);
}
.brand { display: flex; gap: 10px; align-items: center; text-decoration: none; color: var(--text); font-size: 1.15rem; }
.brand-icon { font-size: 1.5rem; }
.topbar nav { display: flex; gap: 22px; }
.topbar nav a { text-decoration: none; color: var(--muted); font-size: 0.95rem; }
.topbar nav a:hover { color: var(--text); }
main { max-width: 880px; margin: 0 auto; padding: 0 18px 40px; }
.hero { text-align: center; padding: clamp(28px, 7vh, 72px) 0 26px; }
.hero h1 { font-size: clamp(1.9rem, 5.4vw, 3.1rem); margin: 0 0 14px; line-height: 1.15; letter-spacing: -0.02em; }
.grad { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.subtitle { color: var(--muted); font-size: clamp(1rem, 2.4vw, 1.14rem); max-width: 620px; margin: 0 auto 30px; line-height: 1.55; }
.fetch-box {
  display: flex; gap: 8px; max-width: 680px; margin: 0 auto;
  background: var(--card); border: 1px solid var(--border);
  padding: 8px; border-radius: 999px; backdrop-filter: blur(8px);
}
.fetch-box input {
  flex: 1; min-width: 0; border: 0; outline: 0; background: transparent;
  color: var(--text); font-size: 1rem; padding: 10px 16px;
}
.fetch-box input::placeholder { color: #6b7592; }
button { font: inherit; cursor: pointer; }
#fetch-btn, .primary {
  border: 0; border-radius: 999px; padding: 12px 26px; font-weight: 600; color: #fff;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: transform 0.12s ease, opacity 0.12s ease, filter 0.12s ease;
  white-space: nowrap;
}
#fetch-btn:hover, .primary:hover { filter: brightness(1.12); transform: translateY(-1px); }
#fetch-btn:disabled, .primary:disabled { opacity: 0.55; cursor: wait; transform: none; }
.danger {
  border: 1px solid rgba(255, 91, 110, 0.5); background: rgba(255, 91, 110, 0.12);
  color: #ffb3bc; border-radius: 999px; padding: 12px 22px; font-weight: 600;
}
.hint { color: var(--muted); font-size: 0.9rem; margin-top: 14px; }
.linklike { background: none; border: 0; color: #aebaff; text-decoration: underline; padding: 0; font-size: inherit; }
.status {
  max-width: 640px; margin: 18px auto 0; padding: 12px 18px; border-radius: 12px;
  background: rgba(109, 124, 255, 0.12); border: 1px solid rgba(109, 124, 255, 0.35); font-size: 0.95rem;
}
.status.error { background: rgba(255, 91, 110, 0.12); border-color: rgba(255, 91, 110, 0.45); color: #ffd6da; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: clamp(18px, 3.5vw, 30px); margin-top: 18px; backdrop-filter: blur(8px);
}
.book-head { display: flex; gap: 22px; align-items: flex-start; }
#book-cover {
  width: 118px; height: auto; border-radius: 10px; border: 1px solid var(--border);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45); object-fit: cover; background: #1a2140;
}
.book-meta h2 { margin: 2px 0 14px; font-size: 1.3rem; line-height: 1.35; }
.book-meta ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.book-meta li { display: flex; gap: 12px; font-size: 0.95rem; }
.book-meta li span { color: var(--muted); min-width: 105px; }
.options {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px; margin: 24px 0 6px;
}
.options label { display: flex; flex-direction: column; gap: 7px; font-size: 0.88rem; color: var(--muted); }
.options select, .options input[type="number"] {
  background: rgba(255,255,255,0.06); border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 10px 12px; font-size: 0.97rem; outline: 0;
}
.options input[type="range"] { accent-color: var(--accent2); margin-top: 8px; }
.actions { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
#progress-wrap { margin-top: 22px; }
.progress-bar { height: 12px; border-radius: 999px; background: rgba(255,255,255,0.08); overflow: hidden; }
#progress-fill {
  height: 100%; width: 0%; border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.25s ease;
}
.progress-text { color: var(--muted); font-size: 0.92rem; margin: 10px 2px 0; }
.log {
  margin-top: 16px; max-height: 180px; overflow: auto; white-space: pre-wrap;
  background: rgba(0,0,0,0.32); border: 1px solid var(--border); border-radius: 12px;
  padding: 12px 14px; font-size: 0.82rem; color: #c3cbE4; line-height: 1.5;
}
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 34px; }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.feature-icon { font-size: 1.7rem; margin-bottom: 10px; }
.feature h3 { margin: 0 0 8px; font-size: 1.02rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.55; }
.how { margin-top: 36px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(18px, 3.5vw, 30px); }
.how h2 { margin-top: 0; }
.how ol { line-height: 1.75; color: #d4daf0; padding-left: 22px; }
.how code { background: rgba(255,255,255,0.09); padding: 1px 7px; border-radius: 6px; font-size: 0.88em; }
.note { color: var(--muted); line-height: 1.6; font-size: 0.94rem; }
footer { text-align: center; color: var(--muted); font-size: 0.88rem; padding: 26px 18px 36px; line-height: 1.7; }
.top-right { display: flex; align-items: center; gap: 22px; }
.lang-switch { display: flex; background: var(--card); border: 1px solid var(--border); border-radius: 999px; padding: 3px; }
.lang-switch button {
  border: 0; background: transparent; color: var(--muted); font-weight: 700; font-size: 0.83rem;
  padding: 6px 13px; border-radius: 999px; cursor: pointer; letter-spacing: 0.04em;
}
.lang-switch button.active { background: linear-gradient(90deg, var(--accent), var(--accent2)); color: #fff; }
.consent {
  display: flex; gap: 11px; align-items: flex-start; margin-top: 20px; cursor: pointer;
  background: rgba(255, 196, 0, 0.06); border: 1px solid rgba(255, 196, 0, 0.28);
  border-radius: 12px; padding: 13px 15px; font-size: 0.9rem; line-height: 1.5; color: #e8dfc8;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.consent input { margin-top: 3px; width: 17px; height: 17px; accent-color: var(--accent2); flex: none; }
.consent.warn { border-color: var(--danger); background: rgba(255, 91, 110, 0.13); }
.legal {
  margin-top: 26px; border-radius: var(--radius); padding: clamp(18px, 3.5vw, 30px);
  background: rgba(255, 196, 0, 0.045); border: 1px solid rgba(255, 196, 0, 0.25);
}
.legal h2 { margin-top: 0; font-size: 1.25rem; }
.legal p { color: #d8d2bd; line-height: 1.7; font-size: 0.96rem; }
.book-meta li span { min-width: 105px; }
@media (max-width: 560px) {
  .fetch-box { flex-direction: column; border-radius: 22px; }
  .book-head { flex-direction: column; }
  #book-cover { width: 90px; }
  .topbar nav { display: none; }
}