/* ============================================================
   ISBN Scanner — app.css
   Design: "Field Notebook" — warm cream, forest green, serif headings
   Variables at top for easy re-skinning
   ============================================================ */

:root {
  --bg:          #FAF8F5;
  --bg-card:     #FFFFFF;
  --fg:          #1E2A3A;
  --fg-muted:    #6B7280;
  --fg-subtle:   #9CA3AF;
  --primary:     #2D6A4F;
  --primary-fg:  #FFFFFF;
  --primary-lt:  #D1FAE5;
  --primary-dk:  #1B4332;
  --accent:      #52B788;
  --warn-bg:     #FFFBEB;
  --warn-border: #FCD34D;
  --warn-fg:     #92400E;
  --border:      #E5E7EB;
  --border-dk:   #D1D5DB;
  --shadow-sm:   0 1px 3px rgba(0,0,0,.08);
  --shadow-md:   0 4px 12px rgba(0,0,0,.10);
  --radius:      8px;
  --radius-sm:   5px;
  --font-body:   'Lato', system-ui, sans-serif;
  --font-head:   'Lora', Georgia, serif;
  --font-mono:   'IBM Plex Mono', 'Courier New', monospace;
  --shelf-wood:  linear-gradient(180deg,#C8A97E 0%,#A0784A 40%,#8B6340 100%);
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

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

button { font-family: inherit; cursor: pointer; border: none; background: none; }

input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--border-dk);
  border-radius: var(--radius-sm);
  padding: .5rem .75rem;
  background: var(--bg-card);
  color: var(--fg);
  width: 100%;
  outline: none;
  transition: border-color .15s;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(45,106,79,.15); }

/* ── Layout ── */
.container { width: 100%; max-width: 680px; margin: 0 auto; padding: 0 1rem; }

/* ── Header ── */
#app-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250,248,245,.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px; gap: .5rem;
}
.header-left { display: flex; align-items: center; gap: .25rem; min-width: 0; }
.app-logo { color: var(--primary); flex-shrink: 0; }

/* Library switcher button */
#lib-switcher-btn {
  display: flex; align-items: center; gap: .4rem;
  padding: .3rem .6rem; border-radius: var(--radius-sm);
  font-size: .875rem; font-weight: 600; color: var(--fg);
  max-width: 200px; overflow: hidden;
  transition: background .15s;
}
#lib-switcher-btn:hover { background: var(--border); }
#lib-switcher-btn .lib-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#lib-switcher-btn svg { flex-shrink: 0; color: var(--fg-muted); }

.header-right { display: flex; align-items: center; gap: .25rem; flex-shrink: 0; }

.icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  color: var(--fg-muted); transition: background .15s, color .15s;
  position: relative;
}
.icon-btn:hover { background: var(--border); color: var(--fg); }
.icon-btn .dot {
  position: absolute; top: 6px; right: 6px;
  width: 7px; height: 7px; border-radius: 50%; background: #F59E0B;
}

.sheet-link {
  display: flex; align-items: center; gap: .3rem;
  font-size: .75rem; color: var(--primary); padding: .3rem .5rem;
  border-radius: var(--radius-sm); transition: background .15s;
}
.sheet-link:hover { background: var(--primary-lt); text-decoration: none; }
.sheet-link span { display: none; }
@media (min-width: 480px) { .sheet-link span { display: inline; } }

/* ── Dropdown ── */
.dropdown-wrap { position: relative; }
.dropdown {
  position: absolute; top: calc(100% + 4px); left: 0;
  min-width: 240px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-md); z-index: 200;
  overflow: hidden;
}
.dropdown.hidden { display: none; }
.dropdown-label {
  font-size: .7rem; font-weight: 600; color: var(--fg-muted);
  text-transform: uppercase; letter-spacing: .06em;
  padding: .6rem .75rem .3rem;
}
.dropdown-sep { height: 1px; background: var(--border); margin: .25rem 0; }
.dropdown-item {
  display: flex; align-items: center; gap: .5rem;
  padding: .55rem .75rem; font-size: .875rem;
  cursor: pointer; transition: background .12s;
}
.dropdown-item:hover { background: var(--border); }
.dropdown-item.active { color: var(--primary); font-weight: 600; }
.dropdown-item .item-name { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dropdown-item .item-count {
  font-family: var(--font-mono); font-size: .7rem;
  background: var(--border); border-radius: 99px; padding: .1rem .45rem;
  flex-shrink: 0;
}
.dropdown-item .item-actions { display: flex; gap: 2px; opacity: 0; transition: opacity .12s; }
.dropdown-item:hover .item-actions { opacity: 1; }
.item-action-btn {
  display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; border-radius: 4px;
  color: var(--fg-muted); transition: background .12s, color .12s;
}
.item-action-btn:hover { background: var(--border-dk); color: var(--fg); }
.item-action-btn.delete:hover { background: #FEE2E2; color: #DC2626; }
.item-action-btn.delete.confirm { color: #DC2626; }
.dropdown-add {
  display: flex; align-items: center; gap: .5rem;
  padding: .55rem .75rem; font-size: .875rem; font-weight: 600;
  color: var(--primary); cursor: pointer; transition: background .12s;
}
.dropdown-add:hover { background: var(--primary-lt); }

/* ── Main ── */
#main { flex: 1; padding: 1.5rem 0 6rem; }
section { margin-bottom: 1.5rem; }
h2 {
  font-family: var(--font-head); font-size: 1rem; font-weight: 700;
  margin-bottom: .75rem; color: var(--fg);
}

/* ── Banners ── */
.banner {
  display: flex; align-items: flex-start; gap: .75rem;
  padding: .875rem 1rem; border-radius: var(--radius);
  border: 1px solid; font-size: .875rem; margin-bottom: 1.25rem;
}
.banner.warn { background: var(--warn-bg); border-color: var(--warn-border); color: var(--warn-fg); }
.banner.ok   { background: #F0FDF4; border-color: #86EFAC; color: #166534; }
.banner svg  { flex-shrink: 0; margin-top: 1px; }
.banner a, .banner button.link { color: inherit; font-weight: 700; text-decoration: underline; background: none; cursor: pointer; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem 1rem; border-radius: var(--radius-sm);
  font-size: .875rem; font-weight: 600; transition: all .15s;
  white-space: nowrap;
}
.btn-primary { background: var(--primary); color: var(--primary-fg); }
.btn-primary:hover { background: var(--primary-dk); }
.btn-secondary { background: var(--fg-muted); color: #fff; }
.btn-secondary:hover { background: var(--fg); }
.btn-secondary.active { background: #FCD34D; color: var(--fg); }
.btn-danger  { background: #DC2626; color: #fff; }
.btn-danger:hover { background: #B91C1C; }
.btn-ghost   { background: transparent; color: var(--fg-muted); }
.btn-ghost:hover { background: var(--border); color: var(--fg); }
.btn-outline { background: transparent; border: 1px solid var(--border-dk); color: var(--fg); }
.btn-outline:hover { background: var(--border); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ── Scanner ── */
.scanner-controls { display: flex; align-items: center; justify-content: space-between; margin-bottom: .75rem; }
#scanner-wrap {
  position: relative; width: 100%; aspect-ratio: 4/3; max-height: 320px;
  background: #111; border-radius: var(--radius); overflow: hidden;
}
#scanner-video { width: 100%; height: 100%; object-fit: cover; display: block; }
.scanner-overlay {
  position: absolute; inset: 0; pointer-events: none;
  display: flex; align-items: center; justify-content: center;
}
.scan-frame {
  width: 70%; max-width: 280px; aspect-ratio: 3/1;
  border: 2px solid rgba(82,183,136,.8); border-radius: 6px;
  position: relative;
}
.scan-line {
  position: absolute; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: scanline 2s ease-in-out infinite;
  top: 0;
}
@keyframes scanline { 0%,100%{top:0} 50%{top:calc(100% - 2px)} }
.scan-target {
  position: absolute; inset: 0;
}
.scan-target .corner {
  position: absolute;
  width: 20px; height: 20px;
  border: 3px solid rgba(252, 211, 77, 0.9);
}
.scan-target .corner.top-left { top: -2px; left: -2px; border-right: none; border-bottom: none; }
.scan-target .corner.top-right { top: -2px; right: -2px; border-left: none; border-bottom: none; }
.scan-target .corner.bottom-left { bottom: -2px; left: -2px; border-right: none; border-top: none; }
.scan-target .corner.bottom-right { bottom: -2px; right: -2px; border-left: none; border-top: none; }
.scan-hint {
  position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.7); color: #fff;
  padding: 8px 16px; border-radius: 20px;
  font-size: 0.75rem; white-space: nowrap;
}
.scanner-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .75rem; color: #6B7280; padding: 2rem;
  background: #F3F4F6; border-radius: var(--radius); text-align: center;
}
.scanner-placeholder p { font-size: .875rem; }
.flash-overlay {
  position: absolute; inset: 0; background: rgba(82,183,136,.35);
  border-radius: var(--radius); opacity: 0; pointer-events: none;
  transition: opacity .5s;
}
.flash-overlay.active { opacity: 1; transition: none; }
.scanner-hint { font-size: .75rem; color: var(--fg-muted); text-align: center; margin-top: .5rem; }
.scanner-tips { margin-top: 1rem; padding: 1rem; background: var(--primary-lt); border-radius: var(--radius-sm); }
.scanner-tips .scanner-hint { text-align: left; margin: 0 0 .5rem 0; }
.scanner-hint-list {
  list-style: none; padding: 0; margin: 0;
  font-size: .75rem; color: var(--fg-muted);
}
.scanner-hint-list li {
  padding: .25rem 0 .25rem 1.25rem;
  position: relative;
}
.scanner-hint-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
}

/* ── Manual entry ── */
.manual-row { display: flex; gap: .5rem; }
.manual-row input { flex: 1; font-family: var(--font-mono); }

/* ── Divider ── */
.divider { height: 1px; background: var(--border); margin: 1.5rem 0; }

/* ── Book list ── */
.list-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.list-header h2 { margin-bottom: 0; }
.badge {
  font-family: var(--font-mono); font-size: .7rem;
  background: var(--border); border-radius: 99px; padding: .15rem .5rem;
  margin-left: .4rem;
}
.empty-state {
  text-align: center; padding: 3rem 1rem; color: var(--fg-muted);
}
.empty-state svg { opacity: .3; margin-bottom: .75rem; }
.empty-state p { font-size: .875rem; }
.empty-state p + p { font-size: .8rem; margin-top: .25rem; }

/* ── Book card ── */
.book-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: box-shadow .15s;
  border-left: 3px solid var(--primary);
}
.book-card-main {
  display: flex; gap: .75rem; padding: .875rem;
  cursor: pointer; align-items: flex-start;
}
.book-cover {
  width: 52px; height: 72px; object-fit: cover;
  border-radius: 3px; flex-shrink: 0;
  background: var(--border);
}
.book-cover-placeholder {
  width: 52px; height: 72px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dk) 100%);
  border-radius: 3px; display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.6);
}
.book-info { flex: 1; min-width: 0; }
.book-title {
  font-family: var(--font-head); font-weight: 700; font-size: .9375rem;
  line-height: 1.3; margin-bottom: .2rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.book-author { font-size: .8125rem; color: var(--fg-muted); margin-bottom: .35rem; }
.book-meta { display: flex; flex-wrap: wrap; gap: .35rem; }
.book-meta-item {
  font-family: var(--font-mono); font-size: .7rem;
  background: var(--border); border-radius: 4px; padding: .1rem .4rem;
  color: var(--fg-muted);
}
.book-card-actions { display: flex; align-items: center; gap: .35rem; flex-shrink: 0; }
.sync-dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.sync-dot.pending { background: #F59E0B; animation: pulse 1s infinite; }
.sync-dot.synced  { background: #22C55E; }
.sync-dot.error   { background: #EF4444; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
.book-card-detail {
  padding: 0 .875rem .875rem;
  font-size: .8125rem; color: var(--fg-muted); line-height: 1.6;
  border-top: 1px solid var(--border);
  display: none;
}
.book-card-detail.open { display: block; }
.book-isbn { font-family: var(--font-mono); font-size: .75rem; color: var(--fg-subtle); margin-top: .5rem; }

/* ── Bookshelf ── */
#shelf-search { margin-bottom: 1rem; }
.shelf-row { margin-bottom: .75rem; }
.shelf-books {
  display: flex; flex-wrap: wrap; gap: 6px;
  align-items: flex-end; padding: 1rem .75rem 0;
}
.book-spine {
  height: 180px;
  border-radius: 3px 3px 0 0; overflow: hidden;
  position: relative; cursor: pointer;
  box-shadow: 2px 4px 8px rgba(0,0,0,.25), inset -2px 0 4px rgba(0,0,0,.15);
  transition: transform .2s, box-shadow .2s;
  text-decoration: none; display: block;
  flex-shrink: 0;
}
.book-spine:hover {
  transform: translateY(-8px);
  box-shadow: 4px 12px 20px rgba(0,0,0,.3), inset -2px 0 4px rgba(0,0,0,.2);
}
.book-spine img {
  width: 100%; height: 100%; object-fit: cover;
  display: block;
}
.book-spine-text {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  padding: .5rem .25rem;
  writing-mode: vertical-rl; text-orientation: mixed;
}
.book-spine-text span {
  font-family: var(--font-head); font-size: 11px; font-weight: 700;
  color: rgba(255,255,255,.9); text-align: center;
  overflow: hidden; max-height: 160px;
  display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical;
}
.book-spine-isbn {
  position: absolute; bottom: 0; left: 0; right: 0; height: 20px;
  background: rgba(0,0,0,.3);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 7px; color: rgba(255,255,255,.7);
}
.book-spine-hover {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.4);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .15s;
}
.book-spine:hover .book-spine-hover { opacity: 1; }
.shelf-plank {
  height: 16px; margin: 0 4px;
  background: var(--shelf-wood);
  border-radius: 0 0 3px 3px;
  box-shadow: 0 3px 6px rgba(0,0,0,.3), inset 0 1px 0 rgba(255,255,255,.15);
}
.shelf-shadow { height: 6px; margin: 0 12px; background: rgba(0,0,0,.12); border-radius: 0 0 4px 4px; }

/* Tooltip */
.spine-tooltip {
  position: fixed; z-index: 300;
  background: var(--fg); color: #fff;
  border-radius: var(--radius-sm); padding: .5rem .75rem;
  font-size: .75rem; max-width: 180px; text-align: center;
  pointer-events: none; opacity: 0; transition: opacity .15s;
  box-shadow: var(--shadow-md);
}
.spine-tooltip.visible { opacity: 1; }
.spine-tooltip .tt-title { font-weight: 700; line-height: 1.3; }
.spine-tooltip .tt-author { color: rgba(255,255,255,.7); margin-top: .2rem; }
.spine-tooltip .tt-year   { color: rgba(255,255,255,.5); font-size: .7rem; margin-top: .1rem; }
.spine-tooltip .tt-amz    { color: #FCD34D; font-size: .7rem; margin-top: .4rem; }

.shelf-footer { font-size: .75rem; color: var(--fg-muted); text-align: center; margin-top: 1rem; }

/* ── Bottom tab bar ── */
#tab-bar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  background: rgba(250,248,245,.95); backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
  display: flex; height: 60px;
}
.tab-btn {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 3px;
  font-size: .7rem; font-weight: 600; color: var(--fg-muted);
  transition: color .15s; position: relative;
}
.tab-btn.active { color: var(--primary); }
.tab-btn svg { width: 20px; height: 20px; }
.tab-badge {
  position: absolute; top: 8px; right: calc(50% - 20px);
  min-width: 16px; height: 16px; border-radius: 99px;
  background: var(--primary); color: var(--primary-fg);
  font-size: 9px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  padding: 0 3px;
}

/* ── Modal / Dialog ── */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 400;
  background: rgba(0,0,0,.45); display: flex;
  align-items: flex-end; justify-content: center;
  padding: 1rem;
}
@media (min-width: 480px) { .modal-backdrop { align-items: center; } }
.modal-backdrop.hidden { display: none; }
.modal {
  background: var(--bg-card); border-radius: var(--radius);
  width: 100%; max-width: 480px; max-height: 90dvh;
  overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.25rem 1.25rem .75rem;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-family: var(--font-head); font-size: 1.1rem; font-weight: 700; }
.modal-body { padding: 1.25rem; }
.modal-footer {
  display: flex; justify-content: flex-end; gap: .5rem;
  padding: .75rem 1.25rem 1.25rem;
  border-top: 1px solid var(--border);
}

/* Tabs inside modal */
.modal-tabs { display: flex; border-bottom: 1px solid var(--border); margin-bottom: 1.25rem; }
.modal-tab {
  padding: .6rem 1rem; font-size: .875rem; font-weight: 600;
  color: var(--fg-muted); border-bottom: 2px solid transparent;
  cursor: pointer; transition: color .15s, border-color .15s;
  margin-bottom: -1px;
}
.modal-tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* Form fields */
.field { margin-bottom: 1rem; }
.field label { display: block; font-size: .8125rem; font-weight: 600; margin-bottom: .35rem; }
.field .hint { font-size: .75rem; color: var(--fg-muted); margin-top: .3rem; }

/* Code block */
.code-block { border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.code-block-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: .4rem .75rem; background: #F3F4F6;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono); font-size: .7rem; color: var(--fg-muted);
}
.code-block pre {
  overflow-x: auto; overflow-y: auto; max-height: 260px;
  padding: .75rem; font-family: var(--font-mono); font-size: .72rem;
  line-height: 1.6; background: #1E2A3A; color: #E2E8F0;
  white-space: pre; margin: 0;
}

/* Setup steps */
.setup-steps { counter-reset: step; list-style: none; }
.setup-steps li {
  counter-increment: step; display: inline-block; gap: .75rem;
  padding: .6rem 0; font-size: .875rem; color: var(--fg);
}
.setup-steps li::before {
    content: counter(step);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--primary-fg);
    font-size: .75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: -3px;
    display: block;
    float: left;
    text-align: center;
    line-height: 24px;
    margin-right: 0.5rem;
}

/* ── Footer ── */
#app-footer {
  border-top: 1px solid var(--border); padding: 1rem 0;
  margin-bottom: 60px; text-align: center;
  font-size: .75rem; color: var(--fg-muted);
}

/* ── Utilities ── */
.hidden { display: none !important; }
.processing { animation: pulse 1s infinite; }
.text-muted { color: var(--fg-muted); }
.text-sm { font-size: .875rem; }
.mt-1 { margin-top: .25rem; }
.mt-2 { margin-top: .5rem; }