:root {
  --ink: #1b2a2f;
  --ink-soft: #4a6068;
  --cream: #fdf8f0;
  --cream-2: #f7efe2;
  --teal: #0f766e;
  --teal-dark: #0b5d57;
  --teal-soft: #d6f1ec;
  --coral: #ef6f5c;
  --coral-soft: #ffe3dd;
  --amber: #f2a93b;
  --amber-soft: #fff1d6;
  --violet: #7a5cff;
  --violet-soft: #e9e4ff;
  --line: #e4d9c8;
  --white: #ffffff;
  --danger: #c0392b;
  --ok: #15803d;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 18px 40px -22px rgba(27, 42, 47, 0.45);
  --shadow-sm: 0 8px 22px -14px rgba(27, 42, 47, 0.5);
  --font: "Segoe UI", "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --serif: "Georgia", "Iowan Old Style", "Times New Roman", serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--cream);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 700; line-height: 1.2; margin: 0; }

img { max-width: 100%; display: block; }

button, input, select, textarea { font-family: inherit; font-size: 1rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--teal);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  text-decoration: none;
  line-height: 1.2;
}
.btn:hover { background: var(--teal-dark); transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--cream-2); color: var(--ink); }
.btn-coral { background: var(--coral); }
.btn-coral:hover { background: #d95c49; }
.btn-amber { background: var(--amber); color: #3a2606; }
.btn-amber:hover { background: #dd9626; color: #3a2606; }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.85rem; }
.btn-block { width: 100%; }

.field { margin-bottom: 0.9rem; }
.field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.35rem;
}
.input, .select, .textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}
.textarea { resize: vertical; min-height: 90px; }
.hint { font-size: 0.8rem; color: var(--ink-soft); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: var(--cream-2);
  color: var(--ink-soft);
}
.badge-reading { background: var(--amber-soft); color: #8a5a05; }
.badge-exchange { background: var(--teal-soft); color: var(--teal-dark); }
.badge-shelf { background: var(--violet-soft); color: #4a34a8; }
.badge-lent { background: var(--coral-soft); color: #a8382a; }
.badge-read { background: #e6f4e9; color: var(--ok); }

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 0.9rem;
  display: none;
}
.alert.show { display: block; }
.alert-error { background: var(--coral-soft); color: #9c2f20; }
.alert-ok { background: #e6f4e9; color: var(--ok); }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}