/* ── Reset & base ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:    #1a4b8c;
  --blue-dk: #0f2f5c;
  --blue-lt: #e8f0fb;
  --accent:  #2e7dd1;
  --text:    #1a1a2e;
  --muted:   #5a6a7e;
  --border:  #d0daea;
  --bg:      #f4f7fb;
  --white:   #ffffff;
  --red:     #c0392b;
  --green:   #1a7a4a;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

/* ── Views ────────────────────────────────────────────────────────── */
.view { min-height: 100vh; }
.hidden { display: none !important; }

/* ── Logo ─────────────────────────────────────────────────────────── */
.logo {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .04em;
  color: var(--blue-dk);
}
.logo span { color: var(--accent); }

/* ── Topbar ───────────────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: .9rem 2rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

/* ── Container ────────────────────────────────────────────────────── */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

h1 { font-size: 1.5rem; font-weight: 700; color: var(--blue-dk); margin-bottom: .4rem; }
.subtitle { color: var(--muted); margin-bottom: 1.8rem; }

/* ── Login card ───────────────────────────────────────────────────── */
#view-login {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-dk), var(--accent));
}

.login-card {
  background: var(--white);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 8px 32px rgba(0,0,0,.18);
}

.login-card .logo {
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.login-card h1 {
  text-align: center;
  font-size: 1.15rem;
  margin-bottom: 1.5rem;
}

/* ── Form fields ──────────────────────────────────────────────────── */
.field { margin-bottom: 1.1rem; }
.field label { display: block; font-size: .85rem; font-weight: 600; color: var(--muted); margin-bottom: .35rem; }
.field input {
  width: 100%;
  padding: .65rem .9rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: .95rem;
  outline: none;
  transition: border-color .2s;
}
.field input:focus { border-color: var(--accent); }

/* ── Buttons ──────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: var(--blue);
  color: var(--white);
  border: none;
  border-radius: 8px;
  padding: .7rem 1.4rem;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, opacity .2s;
}
.btn-primary:hover { background: var(--blue-dk); }
.btn-primary:disabled { opacity: .45; cursor: not-allowed; }
.login-card .btn-primary { width: 100%; margin-top: .5rem; }

.btn-secondary {
  display: inline-block;
  background: var(--white);
  color: var(--blue);
  border: 1.5px solid var(--blue);
  border-radius: 8px;
  padding: .55rem 1.2rem;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}
.btn-secondary:hover { background: var(--blue-lt); }

.btn-ghost {
  background: none;
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: .45rem .9rem;
  font-size: .88rem;
  color: var(--muted);
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ── Drop zone ────────────────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  background: var(--white);
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent);
  background: var(--blue-lt);
}
.drop-zone svg { width: 2.5rem; height: 2.5rem; color: var(--accent); margin-bottom: .8rem; }
.drop-zone p { color: var(--muted); margin-bottom: .4rem; }
.drop-zone .hint { font-size: .85rem; margin-bottom: .8rem; }

/* ── Error / loading ──────────────────────────────────────────────── */
.error {
  margin-top: 1rem;
  color: var(--red);
  background: #fdf0ee;
  border: 1px solid #f5c6c0;
  border-radius: 7px;
  padding: .65rem 1rem;
  font-size: .9rem;
}
.loading {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin-top: 1.2rem;
  color: var(--muted);
}
.spinner {
  width: 18px; height: 18px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Chapter list ─────────────────────────────────────────────────── */
.select-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.select-actions { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }

.section-group { margin-bottom: 1.5rem; }

.section-label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: .4rem;
  margin-bottom: .6rem;
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .65rem .9rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background .15s;
  user-select: none;
}
.chapter-item:hover { background: var(--blue-lt); }
.chapter-item.selected { background: var(--blue-lt); }

.chapter-item input[type="checkbox"] {
  width: 17px; height: 17px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.chapter-num {
  font-size: .78rem;
  font-weight: 700;
  color: var(--white);
  background: var(--accent);
  border-radius: 4px;
  padding: .1rem .45rem;
  min-width: 28px;
  text-align: center;
  flex-shrink: 0;
}
.chapter-num.annex { background: var(--blue-dk); font-size: .72rem; }

.chapter-label { flex: 1; font-size: .92rem; line-height: 1.4; }

/* ── Generate bar ─────────────────────────────────────────────────── */
.generate-bar {
  position: sticky;
  bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: .9rem 1.2rem;
  margin-top: 2rem;
  box-shadow: 0 4px 20px rgba(0,0,0,.1);
}
#count-label { font-size: .9rem; color: var(--muted); }