:root {
  --paper: #f7f4ed;
  --paper-deep: #ede6d9;
  --paper-soft: #fbf8f1;
  --ink: #1a1a1a;
  --ink-soft: #4c4842;
  --muted: #8a8580;
  --line: rgba(26, 26, 26, 0.09);
  --green: #1aad19;
  --green-soft: rgba(26, 173, 25, 0.12);
  --danger: #c0392b;
  --radius: 14px;
  --shadow: 0 10px 28px rgba(74, 58, 38, 0.1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { background: var(--paper-deep); }

body {
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(900px 480px at 50% -12%, rgba(255, 255, 255, 0.55), transparent 70%),
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

[hidden] { display: none !important; }

.screen { min-height: 100vh; }

/* ---- Unlock ---- */
#unlock {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.unlock-card {
  width: min(420px, 100%);
  padding: 1.75rem 1.5rem 1.4rem;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  text-align: center;
}

.brand-mark {
  width: 48px; height: 48px;
  margin: 0 auto 0.85rem;
  border-radius: 14px;
  background: var(--green);
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  display: grid;
  place-items: center;
}

.unlock-card h1 {
  font-size: 1.25rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.lead {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.92rem;
}

#unlock-form { margin-top: 1.25rem; text-align: left; }

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
  font-weight: 550;
}

.field em { font-style: normal; color: var(--muted); font-weight: 400; }

.field input {
  appearance: none;
  width: 100%;
  padding: 0.72rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  font-size: 1rem;
  font-family: inherit;
}

.field input:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px var(--green-soft);
}

.field-optional { opacity: 0.92; }

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.55rem 1rem;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--ink);
}

.btn.primary {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.78rem 1rem;
  background: var(--green);
  color: #fff;
}

.btn.primary:disabled { opacity: 0.55; cursor: wait; }

.btn.ghost {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.45);
  color: var(--ink-soft);
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
}

.btn.ghost:active { background: var(--paper-deep); }

.error {
  margin-top: 0.75rem;
  color: var(--danger);
  font-size: 0.88rem;
  text-align: center;
}

.hint {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.78rem;
}

/* ---- App shell ---- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem clamp(1rem, 4vw, 2rem);
  background: rgba(247, 244, 237, 0.9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
}

.brand { display: inline-flex; align-items: center; gap: 0.55rem; }
.brand-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px var(--green-soft);
}
.brand-text { font-weight: 650; letter-spacing: -0.01em; }
.topbar-actions { display: flex; gap: 0.45rem; }

.main {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 1rem clamp(1rem, 4vw, 1.5rem) 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.notice {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  background: var(--green-soft);
  border: 1px solid rgba(26, 173, 25, 0.18);
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.notice code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
  background: rgba(255, 255, 255, 0.55);
  padding: 0.05em 0.35em;
  border-radius: 4px;
}

.panel {
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.05rem 0.85rem;
  box-shadow: 0 4px 14px rgba(74, 58, 38, 0.05);
}

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}

.panel-head h2 {
  font-size: 1rem;
  font-weight: 650;
}

.meta { color: var(--muted); font-size: 0.78rem; }

.status {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.6rem 0.15rem 0.4rem;
}

.book-list, .progress-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.book-item, .progress-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem 0.75rem;
  padding: 0.7rem 0.75rem;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--line);
}

.book-title {
  font-weight: 600;
  font-size: 0.95rem;
  word-break: break-word;
}

.book-sub, .progress-sub {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.78rem;
}

.badge {
  align-self: start;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: var(--paper-deep);
  color: var(--ink-soft);
  white-space: nowrap;
}

.badge.on-cloud {
  background: var(--green-soft);
  color: var(--green);
}

.pct {
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  color: var(--green);
  font-size: 0.9rem;
}

.empty {
  text-align: center;
  padding: 1.4rem 0.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.foot {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem 1.5rem;
  color: var(--muted);
  font-size: 0.75rem;
  word-break: break-all;
}

.linkish {
  appearance: none;
  border: none;
  background: none;
  color: var(--green);
  font: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 420px) {
  .unlock-card { padding: 1.4rem 1.1rem 1.2rem; }
  .book-item, .progress-item { grid-template-columns: 1fr; }
  .badge, .pct { justify-self: start; }
}