/* =============================================================================
   Aşiyân — Premium e-magazine / flipbook shell
   Ottoman-inspired luxury UI + Turn.js–compatible page chrome + subtle vintage toning
   ============================================================================= */

:root {
  /* Slightly vintage: warm browns, brass gold, ivory paper */
  --bg-deep: #0c0a08;
  --bg-mid: #181410;
  --gold: #b8924a;
  --gold-soft: rgba(184, 146, 74, 0.28);
  --ink: #e8dcc8;
  --muted: rgba(232, 220, 200, 0.55);
  --paper: #ebe4d4;
  --paper-edge: #d4c9b4;
  --shadow-book-a: 0 26px 72px rgba(0, 0, 0, 0.58);
  --shadow-book-b: 0 6px 20px rgba(35, 22, 12, 0.4);
  --vintage-photo: sepia(0.11) saturate(0.9) contrast(1.03) brightness(0.98);
  --header-h: 52px;
  --toolbar-h: 56px;
  --pad: clamp(12px, 2.5vw, 28px);
  --radius-ui: 10px;
  --font-ui: "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --font-sans: "Segoe UI", system-ui, -apple-system, Roboto, Ubuntu, sans-serif;
}

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

html,
body {
  height: 100%;
  margin: 0;
  background:
    radial-gradient(ellipse 140% 90% at 50% -10%, rgba(97, 71, 44, 0.418) 0%, transparent 45%),
    radial-gradient(1200px 800px at 50% 22%, #463525 0%, var(--bg-deep) 52%, #060504 100%);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

#app-root {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
}

.app-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 var(--pad);
  border-bottom: 1px solid rgba(184, 146, 74, 0.16);
  background: linear-gradient(180deg, rgba(32, 26, 20, 0.96), rgba(16, 13, 10, 0.72));
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-ui);
}

.brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #e8d4a8, var(--gold) 48%, #5c4420 100%);
  box-shadow: 0 0 10px var(--gold-soft);
}

.brand-title {
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}

.brand-sub {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.stage {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--pad);
  padding-bottom: calc(var(--toolbar-h) + var(--pad) + 8px);
  overflow: hidden;
  /* Tıklamaları kitaba ilet; boş alandan geçenler alttaki katmana gider (araç çubuğu). */
  pointer-events: none;
}

/* Soft vignette + faint paper flecks (no interaction) */
.stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 100% 85% at 50% 48%, transparent 32%, rgba(12, 8, 5, 0.38) 100%),
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 2px,
      rgba(62, 48, 32, 0.03) 2px,
      rgba(62, 48, 32, 0.03) 3px
    );
  opacity: 0.85;
}

.ambient-glow {
  position: absolute;
  inset: 10% 15% 20%;
  background: radial-gradient(ellipse at center, rgba(184, 146, 74, 0.12) 0%, transparent 62%);
  pointer-events: none;
  filter: blur(3px);
}

.book-shell {
  position: relative;
  z-index: 2;
  pointer-events: auto;
  filter:
    drop-shadow(var(--shadow-book-a)) drop-shadow(var(--shadow-book-b)) sepia(0.07)
    saturate(0.94);
}

/* Kitabın sol / sağ — viewport’a sabit, uygulama katmanının en üstüne yakın */
.side-nav-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 9600;
  pointer-events: auto !important;
  touch-action: manipulation;
  width: clamp(44px, 5vw, 52px);
  height: clamp(44px, 5vw, 52px);
  border-radius: 50%;
  border: 1px solid rgba(184, 146, 74, 0.28);
  background: linear-gradient(180deg, rgba(48, 38, 28, 0.92), rgba(24, 18, 14, 0.92));
  color: var(--ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1rem, 2.8vw, 1.25rem);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 240, 210, 0.08);
  backdrop-filter: blur(8px);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease, opacity 0.2s ease;
}

.side-nav-btn:hover:not(:disabled) {
  background: rgba(184, 146, 74, 0.18);
  border-color: rgba(184, 146, 74, 0.45);
}

.side-nav-btn:active:not(:disabled) {
  transform: translateY(-50%) scale(0.96);
}

.side-nav-btn:disabled {
  opacity: 0.28;
  cursor: not-allowed;
}

.side-nav-btn--prev {
  left: clamp(6px, 2.5vw, 22px);
}

.side-nav-btn--next {
  right: clamp(6px, 2.5vw, 22px);
}

@media (max-width: 520px) {
  .side-nav-btn {
    width: 40px;
    height: 40px;
    font-size: 0.95rem;
  }

  .side-nav-btn--prev {
    left: 4px;
  }

  .side-nav-btn--next {
    right: 4px;
  }
}

.zoom-viewport {
  position: relative;
  overflow: hidden;
  border-radius: 3px;
  outline: 1px solid rgba(184, 146, 74, 0.14);
  outline-offset: 4px;
  box-shadow: inset 0 0 0 1px rgba(255, 248, 230, 0.04);
  /* Intentionally no global touch-action:none — interaction is scoped in app.js */
  touch-action: auto;
}

.zoom-pan-layer {
  transform: translate3d(0, 0, 0) scale(1);
  transform-origin: 50% 50%;
  will-change: transform;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.zoom-viewport.is-zoomed .zoom-pan-layer {
  transition: none;
}

.flipbook-mount {
  position: relative;
  margin: 0 auto;
}

/* Turn.js builds .turn-page-wrapper > .turn-page */
.flipbook {
  margin: 0 auto;
  transform: translate3d(0, 0, 0);
}

.flipbook .turn-page-wrapper {
  transform-style: preserve-3d;
  backface-visibility: hidden;
  will-change: transform;
}

.flipbook .turn-page {
  background-color: var(--paper);
  background-image:
    linear-gradient(90deg, rgba(48, 36, 22, 0.06), transparent 18%, transparent 82%, rgba(48, 36, 22, 0.06)),
    linear-gradient(180deg, rgba(255, 242, 210, 0.2), transparent 55%),
    repeating-linear-gradient(0deg, rgba(74, 58, 38, 0.04) 0 1px, transparent 1px 4px);
  overflow: hidden;
  backface-visibility: hidden;
  transform: translate3d(0, 0, 0);
}

.flipbook .turn-page.odd {
  background-image:
    linear-gradient(90deg, rgba(48, 36, 22, 0.07), transparent 22%),
    linear-gradient(180deg, rgba(255, 248, 220, 0.22), transparent 42%),
    repeating-linear-gradient(0deg, rgba(74, 58, 38, 0.035) 0 1px, transparent 1px 4px);
}

.flipbook .turn-page.even {
  background-image:
    linear-gradient(270deg, rgba(48, 36, 22, 0.07), transparent 22%),
    linear-gradient(180deg, rgba(255, 240, 200, 0.16), transparent 44%),
    repeating-linear-gradient(0deg, rgba(74, 58, 38, 0.035) 0 1px, transparent 1px 4px);
}

.page-inner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  pointer-events: none;
}

.page-inner img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  filter: drop-shadow(0 1px 3px rgba(40, 28, 18, 0.2)) var(--vintage-photo);
  transform: translate3d(0, 0, 0);
}

/* Hardcover / kapak — aged leather tone */
.flipbook .turn-page.hard {
  background:
    linear-gradient(90deg, rgba(52, 38, 22, 0.18), rgba(255, 236, 200, 0.05) 24%, rgba(42, 30, 18, 0.12) 100%),
    linear-gradient(180deg, #352a1e, #1e1812 55%, #100d09);
  box-shadow: inset 0 0 0 1px rgba(184, 146, 74, 0.2), inset 0 0 48px rgba(0, 0, 0, 0.42);
}

.flipbook .turn-page.hard.cover .page-inner {
  padding: 10px;
}

.interaction-blocker {
  position: absolute;
  inset: 0;
  z-index: 40;
  display: none;
  background: transparent;
}

.zoom-viewport.is-zoomed .interaction-blocker {
  display: block;
  pointer-events: auto;
  cursor: grab;
}

.zoom-viewport.is-zoomed.is-panning .interaction-blocker {
  cursor: grabbing;
}

.toolbar {
  position: fixed;
  left: 50%;
  bottom: calc(var(--pad) + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  z-index: 9800;
  isolation: isolate;
  pointer-events: auto !important;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(40, 32, 24, 0.94), rgba(22, 17, 12, 0.94));
  border: 1px solid rgba(184, 146, 74, 0.2);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.48), inset 0 1px 0 rgba(255, 240, 210, 0.06);
  backdrop-filter: blur(10px);
}

.tb-btn {
  appearance: none;
  border: 1px solid rgba(184, 146, 74, 0.2);
  background: rgba(255, 248, 235, 0.05);
  color: var(--ink);
  pointer-events: auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease, opacity 0.2s ease;
  touch-action: manipulation;
}

.tb-btn:hover:not(:disabled) {
  background: rgba(184, 146, 74, 0.14);
  border-color: rgba(184, 146, 74, 0.42);
}

.tb-btn:active:not(:disabled) {
  transform: scale(0.96);
}

.tb-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.page-counter {
  min-width: 88px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  color: var(--muted);
  padding: 0 6px;
  font-family: var(--font-ui);
}

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 7000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at center, rgba(28, 22, 16, 0.93), rgba(8, 6, 4, 0.97));
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.loading-overlay.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-inner {
  text-align: center;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  margin: 0 auto 14px;
  border-radius: 50%;
  border: 3px solid rgba(184, 146, 74, 0.18);
  border-top-color: var(--gold);
  animation: spin 0.9s linear infinite;
  box-shadow: 0 0 20px var(--gold-soft);
}

.loading-text {
  margin: 0;
  font-family: var(--font-ui);
  letter-spacing: 0.06em;
  color: var(--muted);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Turn.js bazı modlarda body’ye ekler; tıklamaları engellemesin */
#turn-fwrappers {
  pointer-events: none !important;
}

body.is-fullscreen .app-header {
  opacity: 0;
  pointer-events: none;
  height: 0;
  padding: 0;
  border: none;
  overflow: hidden;
}

body.is-fullscreen .stage {
  padding-bottom: calc(var(--toolbar-h) + var(--pad));
}

@media (prefers-reduced-motion: reduce) {
  .zoom-pan-layer {
    transition: none;
  }

  .loading-spinner {
    animation: none;
    border-top-color: rgba(184, 146, 74, 0.55);
  }

  .book-shell {
    filter: drop-shadow(var(--shadow-book-a)) drop-shadow(var(--shadow-book-b));
  }

  .page-inner img {
    filter: drop-shadow(0 1px 3px rgba(40, 28, 18, 0.2));
  }
}