/* ═══════════════════════════════════════════════════════
   GECMISINSESLERI.COM — Ana Stil Dosyasi
   Tablet oncelikli, interaktif dijital kitap
═══════════════════════════════════════════════════════ */

/* ─────────────────────────────────────────────────────
   CSS DEGISKENLERI (Custom Properties)
───────────────────────────────────────────────────── */
:root {
  --clr-brown-deep:    #3d2010;
  --clr-brown-dark:    #5c3a1e;
  --clr-brown-mid:     #8b5e3c;
  --clr-brown-light:   #c49a6c;
  --clr-cream:         #f2e4c8;
  --clr-cream-light:   #faf6ee;
  --clr-parchment:     #ede0c4;
  --clr-accent:        #9b4926;
  --clr-accent-hover:  #b85a30;
  --clr-text:          #2c1a0e;
  --clr-text-mid:      #5c3a1e;
  --clr-text-light:    #8b6040;

  --topbar-h:    52px;
  --infobar-h:   38px;
  --nav-btn-w:   52px;

  --shadow-page:
    0 2px 6px  rgba(60,30,10,.16),
    0 6px 20px rgba(60,30,10,.20),
    0 14px 40px rgba(30,10,0,.14);

  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   18px;

  --ease-out:    cubic-bezier(.25,.46,.45,.94);

  --font: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

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

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

body {
  font-family: var(--font);
  background-color: var(--clr-parchment);
  background-image:
    radial-gradient(ellipse 80% 50% at 18% 30%, rgba(180,140,80,.28) 0%, transparent 65%),
    radial-gradient(ellipse 55% 70% at 82% 68%, rgba(155,73,38,.18) 0%, transparent 55%),
    radial-gradient(ellipse 50% 40% at 50% 95%, rgba(196,154,108,.20) 0%, transparent 60%);
  color: var(--clr-text);
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
}

/* Masaustu arkaplan desen */
@media (min-width: 1101px) {
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
      repeating-linear-gradient(45deg,
        rgba(92,58,30,.04) 0, rgba(92,58,30,.04) 1px,
        transparent 1px, transparent 14px),
      linear-gradient(175deg, #c8a87a 0%, #b08050 100%);
    z-index: -1;
  }
}

img    { display: block; user-select: none; -webkit-user-select: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
a      { text-decoration: none; color: inherit; }
ul,ol  { list-style: none; }

.hidden { display: none !important; }

/* ─────────────────────────────────────────────────────
   KAPAK EKRANI
───────────────────────────────────────────────────── */
.cover-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-parchment);
  background-image:
    radial-gradient(ellipse 80% 50% at 18% 30%, rgba(180,140,80,.32) 0%, transparent 65%),
    radial-gradient(ellipse 55% 70% at 82% 68%, rgba(155,73,38,.22) 0%, transparent 55%);
  transition: opacity .5s var(--ease-out), transform .5s var(--ease-out);
}

.cover-screen.cover-exit {
  opacity: 0;
  transform: scale(.96);
  pointer-events: none;
}

.cover-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  padding: 24px;
}

.cover-book-shadow {
  border-radius: var(--radius-sm);
  box-shadow:
    -5px 6px 0 rgba(92,58,30,.14),
    -3px 3px 0 rgba(92,58,30,.10),
    0 16px 48px rgba(60,30,10,.38),
    0 4px 12px rgba(60,30,10,.26);
  transform: perspective(900px) rotateY(-4deg);
  transition: transform .4s var(--ease-out), box-shadow .4s var(--ease-out);
}

.cover-book-shadow:hover {
  transform: perspective(900px) rotateY(-2deg) translateY(-5px);
  box-shadow:
    -7px 8px 0 rgba(92,58,30,.14),
    -4px 4px 0 rgba(92,58,30,.10),
    0 24px 64px rgba(60,30,10,.44),
    0 6px 18px rgba(60,30,10,.30);
}

.cover-img {
  display: block;
  height: min(74vh, 620px);
  width: auto;
  border-radius: var(--radius-sm);
}

.btn-open-book {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 32px;
  background: var(--clr-brown-dark);
  color: var(--clr-cream);
  border-radius: 50px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .04em;
  box-shadow: 0 4px 16px rgba(92,58,30,.38), 0 1px 4px rgba(0,0,0,.18);
  transition: background .15s, transform .15s, box-shadow .15s;
}

.btn-open-book:hover,
.btn-open-book:focus-visible {
  background: var(--clr-brown-mid);
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(92,58,30,.48), 0 2px 6px rgba(0,0,0,.22);
  outline: none;
}

.btn-open-book:active { transform: translateY(0); }

/* ─────────────────────────────────────────────────────
   ANA UYGULAMA LAYOUT
───────────────────────────────────────────────────── */
.app {
  position: fixed;
  inset: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(100%, 1100px);
  display: grid;
  grid-template-rows: var(--topbar-h) 1fr var(--infobar-h) auto;
  grid-template-areas: "topbar" "book" "infobar" "media";
  background: var(--clr-parchment);
  background-image:
    radial-gradient(ellipse 100% 35% at 50% 0%, rgba(180,140,80,.18) 0%, transparent 50%);
  box-shadow: 0 0 80px rgba(60,30,10,.30);
  height: 100vh;
  height: 100dvh;
}

/* ─────────────────────────────────────────────────────
   UST BAR
───────────────────────────────────────────────────── */
.top-bar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  background: var(--clr-brown-dark);
  color: var(--clr-cream);
  box-shadow: 0 2px 8px rgba(0,0,0,.22);
  z-index: 10;
}

.top-bar-left,
.top-bar-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-cream);
  letter-spacing: .05em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  color: var(--clr-cream);
  flex-shrink: 0;
  transition: background .15s;
}

.icon-btn:hover,
.icon-btn:focus-visible {
  background: rgba(255,255,255,.15);
  outline: none;
}

.icon-btn:active { background: rgba(255,255,255,.08); }

/* ─────────────────────────────────────────────────────
   KITAP ALANI
───────────────────────────────────────────────────── */
.book-area {
  grid-area: book;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px 4px;
  min-height: 0;
  overflow: hidden;
}

/* Navigasyon butonlari */
.nav-btn {
  flex-shrink: 0;
  width: var(--nav-btn-w);
  height: 100%;
  max-height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-brown-dark);
  background: rgba(242,228,200,.75);
  border-radius: var(--radius-md);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: background .15s, transform .15s, opacity .15s;
  box-shadow: 0 2px 8px rgba(92,58,30,.14);
}

.nav-btn:hover:not(:disabled),
.nav-btn:focus-visible:not(:disabled) {
  background: rgba(139,94,60,.20);
  transform: scale(1.06);
  outline: none;
}

.nav-btn:active:not(:disabled) { transform: scale(.95); }

.nav-btn:disabled {
  opacity: .25;
  cursor: default;
}

/* Sayfa goruntusu */
.page-viewport {
  flex: 1;
  height: 100%;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.page-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  position: relative;
}

.page-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 3px;
  box-shadow: var(--shadow-page);
  user-select: none;
  -webkit-user-drag: none;
  transition: opacity .18s ease;
}

/* Yukleniyor */
.page-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.loading-spinner {
  width: 38px;
  height: 38px;
  border: 3px solid rgba(139,94,60,.22);
  border-top-color: var(--clr-brown-dark);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

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

/* Sayfa gecis animasyonlari */
@keyframes enterFromRight {
  from { transform: translateX(55px) scale(.97); opacity: 0; }
  to   { transform: translateX(0)    scale(1);   opacity: 1; }
}

@keyframes enterFromLeft {
  from { transform: translateX(-55px) scale(.97); opacity: 0; }
  to   { transform: translateX(0)     scale(1);   opacity: 1; }
}

.page-wrapper.enter-right .page-img {
  animation: enterFromRight .35s var(--ease-out) forwards;
}

.page-wrapper.enter-left .page-img {
  animation: enterFromLeft .35s var(--ease-out) forwards;
}

/* ─────────────────────────────────────────────────────
   SAYFA BILGI CUBUGU
───────────────────────────────────────────────────── */
.page-info-bar {
  grid-area: infobar;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 16px;
  background: rgba(196,154,108,.28);
  border-top:    1px solid rgba(139,94,60,.20);
  border-bottom: 1px solid rgba(139,94,60,.20);
}

.section-label {
  font-size: .75rem;
  font-weight: 700;
  color: var(--clr-brown-mid);
  text-transform: uppercase;
  letter-spacing: .09em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 130px;
  flex-shrink: 0;
}

.page-counter-btn {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: .88rem;
  font-weight: 700;
  color: var(--clr-brown-dark);
  padding: 4px 14px;
  border-radius: 20px;
  background: rgba(92,58,30,.10);
  transition: background .15s;
  white-space: nowrap;
  flex-shrink: 0;
}

.page-counter-btn:hover,
.page-counter-btn:focus-visible {
  background: rgba(92,58,30,.20);
  outline: none;
}

.page-sep { opacity: .45; }

.page-title-label {
  font-size: .75rem;
  color: var(--clr-text-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 160px;
  text-align: right;
  flex-shrink: 0;
}

/* ─────────────────────────────────────────────────────
   MEDYA PANELI
───────────────────────────────────────────────────── */
.media-panel {
  grid-area: media;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: rgba(92,58,30,.07);
  border-top: 1px solid rgba(139,94,60,.18);
  flex-wrap: wrap;
  min-height: 60px;
}

/* Ses oynatici */
.audio-player-section {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 180px;
}

.btn-audio-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--clr-brown-dark);
  color: var(--clr-cream);
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(92,58,30,.32);
  transition: background .15s, transform .15s;
}

.btn-audio-toggle:hover,
.btn-audio-toggle:focus-visible {
  background: var(--clr-accent);
  transform: scale(1.08);
  outline: none;
}

.btn-audio-toggle:active { transform: scale(.94); }

.audio-controls {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 0;
}

.audio-label {
  font-size: .76rem;
  font-weight: 700;
  color: var(--clr-brown-mid);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.audio-progress-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.audio-bar {
  position: relative;
  flex: 1;
  height: 6px;
  background: rgba(139,94,60,.22);
  border-radius: 3px;
  cursor: pointer;
  touch-action: none;
}

.audio-bar:focus-visible {
  outline: 2px solid var(--clr-brown-dark);
  outline-offset: 3px;
}

.audio-bar-fill {
  position: absolute;
  left: 0; top: 0;
  height: 100%;
  width: 0;
  background: var(--clr-brown-dark);
  border-radius: 3px;
  pointer-events: none;
  transition: width .1s linear;
}

.audio-bar-thumb {
  position: absolute;
  top: 50%;
  left: 0;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  background: var(--clr-brown-dark);
  border: 2px solid var(--clr-cream-light);
  border-radius: 50%;
  pointer-events: none;
  box-shadow: 0 1px 4px rgba(0,0,0,.22);
  transition: left .1s linear;
}

.audio-time {
  font-size: .70rem;
  color: var(--clr-text-light);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

/* Video butonu */
.video-btn-section {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.btn-open-video {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  background: var(--clr-accent);
  color: #fff;
  border-radius: 20px;
  font-size: .84rem;
  font-weight: 700;
  letter-spacing: .02em;
  box-shadow: 0 2px 8px rgba(155,73,38,.36);
  transition: background .15s, transform .15s;
}

.btn-open-video:hover,
.btn-open-video:focus-visible {
  background: var(--clr-accent-hover);
  transform: translateY(-1px);
  outline: none;
}

.btn-open-video:active { transform: translateY(0); }

/* ─────────────────────────────────────────────────────
   ICEINDEKILER DRAWER
───────────────────────────────────────────────────── */
.toc-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  visibility: hidden;
  transition: visibility 0s .25s;
}

.toc-overlay.open {
  pointer-events: auto;
  visibility: visible;
  transition: visibility 0s;
}

.toc-overlay-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: rgba(30,15,5,.58);
  opacity: 0;
  transition: opacity .25s var(--ease-out);
  cursor: default;
}

.toc-overlay.open .toc-overlay-bg { opacity: 1; }

.toc-drawer {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: min(320px, 85vw);
  background: var(--clr-cream-light);
  background-image: linear-gradient(180deg, rgba(196,154,108,.12) 0%, transparent 28%);
  box-shadow: 4px 0 24px rgba(30,10,0,.26);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform .28s var(--ease-out);
  overflow: hidden;
}

.toc-overlay.open .toc-drawer { transform: translateX(0); }

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  height: var(--topbar-h);
  background: var(--clr-brown-dark);
  color: var(--clr-cream);
  flex-shrink: 0;
}

.toc-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .05em;
}

.toc-list {
  overflow-y: auto;
  flex: 1;
  padding: 8px 0 16px;
  -webkit-overflow-scrolling: touch;
}

.toc-section-item { margin: 2px 0; }

.toc-section-btn {
  width: 100%;
  text-align: left;
  padding: 11px 20px;
  font-size: .94rem;
  font-weight: 700;
  color: var(--clr-brown-dark);
  letter-spacing: .02em;
  transition: background .13s;
}

.toc-section-btn:hover,
.toc-section-btn:focus-visible {
  background: rgba(139,94,60,.13);
  outline: none;
}

.toc-sub-list { margin: 0 0 4px; }

.toc-page-btn {
  width: 100%;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 20px 7px 30px;
  font-size: .82rem;
  color: var(--clr-text-mid);
  transition: background .13s, color .13s;
}

.toc-page-btn:hover,
.toc-page-btn:focus-visible {
  background: rgba(139,94,60,.10);
  color: var(--clr-brown-dark);
  outline: none;
}

.toc-page-num {
  font-variant-numeric: tabular-nums;
  font-size: .72rem;
  color: var(--clr-brown-light);
  min-width: 22px;
  flex-shrink: 0;
}

.toc-page-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc-media-dot {
  font-size: .52rem;
  color: var(--clr-accent);
  flex-shrink: 0;
}

/* ─────────────────────────────────────────────────────
   VIDEO MODAL
───────────────────────────────────────────────────── */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  pointer-events: none;
  visibility: hidden;
  transition: visibility 0s .25s;
}

.video-modal.open {
  pointer-events: auto;
  visibility: visible;
  transition: visibility 0s;
}

.video-modal-bg {
  position: absolute;
  inset: 0;
  background: rgba(12,6,2,.88);
  opacity: 0;
  transition: opacity .25s;
}

.video-modal.open .video-modal-bg { opacity: 1; }

.video-modal-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 920px;
  transform: scale(.92);
  opacity: 0;
  transition: transform .25s var(--ease-out), opacity .25s;
}

.video-modal.open .video-modal-content {
  transform: scale(1);
  opacity: 1;
}

.btn-video-close {
  position: absolute;
  top: -46px;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,.12);
  color: #fff;
  transition: background .15s;
}

.btn-video-close:hover,
.btn-video-close:focus-visible {
  background: rgba(255,255,255,.28);
  outline: none;
}

.video-player {
  width: 100%;
  max-height: 76vh;
  border-radius: var(--radius-md);
  background: #000;
  box-shadow: 0 8px 40px rgba(0,0,0,.55);
}

.video-caption {
  font-size: .82rem;
  color: rgba(255,255,255,.65);
  text-align: center;
}

/* ─────────────────────────────────────────────────────
   SAYFAYA GIT MODAL
───────────────────────────────────────────────────── */
.goto-modal {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  visibility: hidden;
  transition: visibility 0s .18s;
}

.goto-modal.open {
  pointer-events: auto;
  visibility: visible;
  transition: visibility 0s;
}

.goto-modal-bg {
  position: absolute;
  inset: 0;
  background: rgba(30,15,5,.48);
  opacity: 0;
  transition: opacity .18s;
}

.goto-modal.open .goto-modal-bg { opacity: 1; }

.goto-modal-content {
  position: relative;
  z-index: 1;
  background: var(--clr-cream-light);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  min-width: 260px;
  box-shadow: 0 8px 32px rgba(30,10,0,.26);
  transform: translateY(14px) scale(.96);
  opacity: 0;
  transition: transform .18s var(--ease-out), opacity .18s;
}

.goto-modal.open .goto-modal-content {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.goto-modal-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-brown-dark);
  margin-bottom: 16px;
}

.goto-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.goto-input {
  width: 88px;
  padding: 8px 12px;
  border: 2px solid rgba(139,94,60,.30);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  color: var(--clr-text);
  background: #fff;
  text-align: center;
  transition: border-color .15s;
}

.goto-input:focus {
  outline: none;
  border-color: var(--clr-brown-dark);
}

.goto-total {
  font-size: .88rem;
  color: var(--clr-text-light);
}

.goto-actions {
  display: flex;
  gap: 10px;
}

/* Ortak buton stilleri */
.btn-primary {
  padding: 9px 22px;
  background: var(--clr-brown-dark);
  color: var(--clr-cream);
  border-radius: 20px;
  font-size: .88rem;
  font-weight: 700;
  transition: background .15s;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--clr-brown-mid);
  outline: none;
}

.btn-secondary {
  padding: 9px 22px;
  background: rgba(139,94,60,.14);
  color: var(--clr-brown-mid);
  border-radius: 20px;
  font-size: .88rem;
  font-weight: 700;
  transition: background .15s;
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: rgba(139,94,60,.26);
  outline: none;
}

/* ─────────────────────────────────────────────────────
   KARSILAMA IPUCU
───────────────────────────────────────────────────── */
.welcome-hint {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(30,15,5,.52);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s;
}

.welcome-hint.open {
  opacity: 1;
  pointer-events: auto;
}

.welcome-hint-content {
  background: var(--clr-cream-light);
  border-radius: var(--radius-lg);
  padding: 28px 28px 24px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(30,10,0,.28);
  text-align: center;
}

.hint-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 10px;
  color: var(--clr-brown-mid);
}

.welcome-hint-content h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--clr-brown-dark);
  margin-bottom: 14px;
}

.hint-list {
  text-align: left;
  padding-left: 18px;
  list-style: disc;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.hint-list li {
  font-size: .86rem;
  color: var(--clr-text-mid);
  line-height: 1.5;
}

/* ─────────────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────────────── */

/* Kucuk mobil */
@media (max-width: 479px) {
  :root {
    --nav-btn-w: 40px;
    --topbar-h:  47px;
    --infobar-h: 34px;
  }

  .site-title        { font-size: .86rem; max-width: 150px; }
  .section-label     { max-width: 80px; }
  .page-title-label  { max-width: 100px; }
  .cover-img         { height: min(64vh, 500px); }
  .media-panel       { padding: 8px 12px; }
  .btn-open-video    { font-size: .78rem; padding: 8px 12px; }
  .btn-open-book     { font-size: .96rem; padding: 12px 26px; }
}

/* Tablet & ustu */
@media (min-width: 600px) {
  .book-area        { padding: 16px 8px; gap: 10px; }
  .site-title       { font-size: 1.05rem; max-width: 280px; }
}

@media (min-width: 768px) {
  .book-area        { padding: 20px 10px; gap: 14px; }
  :root { --nav-btn-w: 56px; }
}

/* Yuksek ekranlar */
@media (min-height: 900px) {
  .book-area { padding: 26px 10px; }
}

/* Yatay + kisa ekran (landscape mobil) */
@media (max-height: 480px) {
  :root {
    --topbar-h:  44px;
    --infobar-h: 30px;
  }

  .book-area         { padding: 5px 4px; gap: 4px; }
  .media-panel       { padding: 5px 12px; min-height: 50px; }
  .btn-audio-toggle  { width: 34px; height: 34px; }
}

/* Tam ekran modunda ust bar seffaf */
:fullscreen .top-bar,
:-webkit-full-screen .top-bar {
  background: rgba(61,32,16,.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}