/*
 * Korean Bible Viewer
 * Apple-inspired design system (mobile-first)
 * Tokens from: Apple homepage / store / accessories
 */

.kbv-root {
  /* === Color tokens === */
  --kbv-primary:        #0066cc;
  --kbv-primary-focus:  #0071e3;
  --kbv-canvas:         #ffffff;
  --kbv-parchment:      #f5f5f7;
  --kbv-pearl:          #fafafc;
  --kbv-ink:            #1d1d1f;
  --kbv-ink-80:         #333333;
  --kbv-ink-48:         #7a7a7a;
  --kbv-divider:        rgba(0,0,0,0.04);
  --kbv-hairline:       #e0e0e0;
  --kbv-tile-1:         #272729;
  --kbv-chip-trans:     rgba(210,210,215,0.64);

  /* === Typography === */
  --kbv-font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Apple SD Gothic Neo", system-ui, sans-serif;
  --kbv-font-text:    -apple-system, BlinkMacSystemFont, "SF Pro Text", "Apple SD Gothic Neo", system-ui, sans-serif;

  /* === Spacing (8px base) === */
  --kbv-s-xxs: 4px;
  --kbv-s-xs:  8px;
  --kbv-s-sm:  12px;
  --kbv-s-md:  17px;
  --kbv-s-lg:  24px;
  --kbv-s-xl:  32px;
  --kbv-s-xxl: 48px;
  --kbv-s-sec: 80px;

  /* === Radius === */
  --kbv-r-sm:   8px;
  --kbv-r-md:   11px;
  --kbv-r-lg:   18px;
  --kbv-r-pill: 9999px;

  /* === Shadow (single product shadow only) === */
  --kbv-shadow-product: 0 5px 30px rgba(0,0,0,0.22);
  --kbv-shadow-float:   0 8px 32px rgba(0,0,0,0.12);

  /* Layout */
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  background: var(--kbv-canvas);
  color: var(--kbv-ink);
  font-family: var(--kbv-font-text);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  border-radius: var(--kbv-r-lg);
  overflow: hidden;
  box-sizing: border-box;
  isolation: isolate;
}

.kbv-root *,
.kbv-root *::before,
.kbv-root *::after {
  box-sizing: border-box;
}

.kbv-root button {
  font-family: inherit;
  cursor: pointer;
  border: 0;
  background: transparent;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}

/* ============================================================
 * TOP NAV (frosted)
 * ============================================================ */
.kbv-nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--kbv-s-sm);
  padding: 10px var(--kbv-s-md);
  height: 52px;
  background: rgba(245, 245, 247, 0.80);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
          backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

.kbv-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--kbv-r-pill);
  background: var(--kbv-canvas);
  color: var(--kbv-ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1;
  border: 1px solid rgba(0,0,0,0.06);
  transition: transform 120ms ease, background 120ms ease;
  max-width: 60%;
  min-height: 36px;
}
.kbv-nav-btn:active { transform: scale(0.95); }
.kbv-nav-btn:focus-visible {
  outline: 2px solid var(--kbv-primary-focus);
  outline-offset: 2px;
}

.kbv-nav-loc { flex: 1 1 auto; min-width: 0; }
.kbv-nav-loc-text,
.kbv-nav-ver-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.kbv-nav-ver {
  flex: 0 0 auto;
  background: var(--kbv-ink);
  color: #fff;
  border-color: transparent;
}

.kbv-chev { flex: 0 0 auto; opacity: 0.6; }

/* ============================================================
 * READER
 * ============================================================ */
.kbv-reader {
  flex: 1 1 auto;
  padding: var(--kbv-s-xxl) var(--kbv-s-md) calc(var(--kbv-s-xxl) + 80px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  outline: none;
}

.kbv-reader-head {
  text-align: center;
  margin-bottom: var(--kbv-s-xl);
}
.kbv-reader-title {
  font-family: var(--kbv-font-display);
  font-size: 34px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.022em;
  margin: 0 0 var(--kbv-s-xs);
  color: var(--kbv-ink);
}
.kbv-reader-sub {
  font-size: 17px;
  font-weight: 400;
  color: var(--kbv-ink-48);
  margin: 0;
  letter-spacing: -0.01em;
}

.kbv-verses {
  max-width: 640px;
  margin: 0 auto;
}

.kbv-verse {
  margin: 0 0 var(--kbv-s-md);
  padding: 6px 8px;
  border-radius: var(--kbv-r-sm);
  font-size: 17px;
  line-height: 1.65;
  color: var(--kbv-ink);
  letter-spacing: -0.01em;
  transition: background 160ms ease;
  touch-action: manipulation;
}
.kbv-verse.is-active {
  background: rgba(0, 102, 204, 0.06);
}

.kbv-vnum {
  display: inline-block;
  margin-right: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--kbv-primary);
  letter-spacing: 0;
  vertical-align: super;
  line-height: 1;
}

.kbv-vtext { font-size: 17px; }

.kbv-empty {
  text-align: center;
  padding: var(--kbv-s-xxl) var(--kbv-s-md);
  color: var(--kbv-ink-48);
}
.kbv-empty p { margin: 0 0 var(--kbv-s-sm); }
.kbv-empty-sub { font-size: 14px; }
.kbv-empty code {
  background: var(--kbv-parchment);
  padding: 2px 6px;
  border-radius: var(--kbv-r-sm);
  font-size: 13px;
}

/* ============================================================
 * FLOATING BAR (chapter nav)
 * ============================================================ */
.kbv-floatbar {
  position: sticky;
  bottom: var(--kbv-s-md);
  margin: 0 var(--kbv-s-md) var(--kbv-s-md);
  align-self: center;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  background: rgba(245, 245, 247, 0.85);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
          backdrop-filter: saturate(180%) blur(20px);
  border-radius: var(--kbv-r-pill);
  box-shadow: var(--kbv-shadow-float);
  border: 1px solid rgba(0,0,0,0.05);
  z-index: 4;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.kbv-floatbar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--kbv-r-pill);
  color: var(--kbv-ink);
  transition: background 120ms ease, transform 120ms ease;
}
.kbv-floatbar-btn:hover { background: rgba(0,0,0,0.05); }
.kbv-floatbar-btn:active { transform: scale(0.92); }
.kbv-floatbar-btn:disabled {
  opacity: 0.3;
  pointer-events: none;
}

.kbv-floatbar-mid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  height: 40px;
  border-radius: var(--kbv-r-pill);
  background: var(--kbv-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: transform 120ms ease;
  min-width: 64px;
}
.kbv-floatbar-mid:active { transform: scale(0.95); }

/* ============================================================
 * BOTTOM SHEET (책/장/번역본 선택)
 * ============================================================ */
.kbv-sheet {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  pointer-events: none;
}
.kbv-sheet[aria-hidden="false"] {
  display: block;
  pointer-events: auto;
}

.kbv-sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  transition: background 240ms ease;
}
.kbv-sheet[aria-hidden="false"] .kbv-sheet-backdrop {
  background: rgba(0,0,0,0.4);
}

.kbv-sheet-panel {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  max-height: 85vh;
  background: var(--kbv-canvas);
  border-radius: var(--kbv-r-lg) var(--kbv-r-lg) 0 0;
  transform: translateY(100%);
  transition: transform 280ms cubic-bezier(0.32, 0.72, 0, 1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  font-family: var(--kbv-font-text);
}
.kbv-sheet[aria-hidden="false"] .kbv-sheet-panel {
  transform: translateY(0);
}

.kbv-sheet-handle {
  width: 40px;
  height: 5px;
  background: rgba(0,0,0,0.15);
  border-radius: var(--kbv-r-pill);
  margin: 8px auto 4px;
  flex: 0 0 auto;
}

.kbv-sheet-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--kbv-s-sm) var(--kbv-s-md);
  border-bottom: 1px solid var(--kbv-divider);
  flex: 0 0 auto;
}
.kbv-sheet-title {
  margin: 0;
  font-family: var(--kbv-font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--kbv-ink);
}
.kbv-sheet-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--kbv-r-pill);
  background: var(--kbv-parchment);
  color: var(--kbv-ink);
  transition: transform 120ms ease;
}
.kbv-sheet-close:active { transform: scale(0.92); }

.kbv-sheet-body {
  flex: 1 1 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--kbv-s-sm) 0 calc(env(safe-area-inset-bottom) + var(--kbv-s-md));
}

/* Tabs (구약/신약) */
.kbv-tabs {
  display: flex;
  gap: 6px;
  padding: 0 var(--kbv-s-md) var(--kbv-s-sm);
  position: sticky;
  top: 0;
  background: var(--kbv-canvas);
  z-index: 1;
}
.kbv-tab {
  flex: 1 1 0;
  padding: 10px 12px;
  border-radius: var(--kbv-r-pill);
  background: var(--kbv-parchment);
  color: var(--kbv-ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: background 120ms ease, color 120ms ease;
}
.kbv-tab.is-active {
  background: var(--kbv-primary);
  color: #fff;
}

/* Search (책 검색) */
.kbv-search {
  padding: 0 var(--kbv-s-md) var(--kbv-s-sm);
}
.kbv-search-input {
  width: 100%;
  height: 40px;
  padding: 0 16px;
  border-radius: var(--kbv-r-pill);
  border: 1px solid var(--kbv-hairline);
  background: var(--kbv-canvas);
  color: var(--kbv-ink);
  font-family: inherit;
  font-size: 15px;
  letter-spacing: -0.01em;
  outline: none;
  transition: border-color 160ms ease;
}
.kbv-search-input:focus {
  border-color: var(--kbv-primary);
}

/* Book list */
.kbv-list { padding: 0 var(--kbv-s-xs); }
.kbv-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px var(--kbv-s-sm);
  border-radius: var(--kbv-r-md);
  background: transparent;
  text-align: left;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--kbv-ink);
  transition: background 120ms ease;
}
.kbv-list-item:hover { background: var(--kbv-parchment); }
.kbv-list-item.is-active {
  background: rgba(0, 102, 204, 0.08);
  color: var(--kbv-primary);
  font-weight: 600;
}
.kbv-list-item-meta {
  font-size: 13px;
  color: var(--kbv-ink-48);
  font-weight: 400;
}
.kbv-list-item.is-active .kbv-list-item-meta {
  color: var(--kbv-primary);
  opacity: 0.7;
}

/* Chapter grid */
.kbv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 8px;
  padding: var(--kbv-s-sm) var(--kbv-s-md);
}
.kbv-grid-item {
  height: 52px;
  border-radius: var(--kbv-r-md);
  background: var(--kbv-parchment);
  color: var(--kbv-ink);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: background 120ms ease, color 120ms ease, transform 120ms ease;
}
.kbv-grid-item:active { transform: scale(0.94); }
.kbv-grid-item.is-active {
  background: var(--kbv-primary);
  color: #fff;
}

/* Loading */
.kbv-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--kbv-s-xl);
  color: var(--kbv-ink-48);
  font-size: 14px;
}
.kbv-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(0,0,0,0.1);
  border-top-color: var(--kbv-primary);
  border-radius: 50%;
  animation: kbv-spin 0.7s linear infinite;
  margin-right: 8px;
}
@keyframes kbv-spin { to { transform: rotate(360deg); } }

/* ============================================================
 * RESPONSIVE
 * ============================================================ */
@media (min-width: 736px) {
  .kbv-reader {
    padding-left: var(--kbv-s-xl);
    padding-right: var(--kbv-s-xl);
  }
  .kbv-reader-title { font-size: 40px; }
  .kbv-verse { font-size: 18px; line-height: 1.7; }
  .kbv-vtext { font-size: 18px; }
}

@media (min-width: 1024px) {
  .kbv-reader-title { font-size: 48px; }
  .kbv-reader { padding-top: var(--kbv-s-sec); }

  /* On desktop, sheet becomes a centered modal */
  .kbv-sheet-panel {
    left: 50%;
    right: auto;
    bottom: auto;
    top: 50%;
    transform: translate(-50%, calc(-50% + 30px));
    width: 480px;
    max-height: 70vh;
    border-radius: var(--kbv-r-lg);
  }
  .kbv-sheet[aria-hidden="false"] .kbv-sheet-panel {
    transform: translate(-50%, -50%);
  }
  .kbv-sheet-handle { display: none; }
}

/* ============================================================
 * Reduce motion
 * ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .kbv-sheet-panel { transition: none; }
  .kbv-verse, .kbv-nav-btn, .kbv-tab,
  .kbv-list-item, .kbv-grid-item,
  .kbv-floatbar-btn, .kbv-floatbar-mid {
    transition: none !important;
  }
}

/* ============================================================
 * COPY TOAST
 * ============================================================ */
.kbv-copy-toast {
  position: fixed;
  left: 50%;
  bottom: calc(20px + env(safe-area-inset-bottom));
  z-index: 100000;
  transform: translate(-50%, 12px) scale(0.96);
  padding: 10px 16px;
  border-radius: 9999px;
  background: rgba(29, 29, 31, 0.92);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transition: opacity 140ms ease, transform 140ms ease;
  -webkit-backdrop-filter: saturate(180%) blur(20px);
          backdrop-filter: saturate(180%) blur(20px);
  white-space: nowrap;
}
.kbv-copy-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}

@media (prefers-reduced-motion: reduce) {
  .kbv-copy-toast {
    transition: none;
  }
}