/* ══════════════════════════════════════════
   BRIGHT BASTASA — Portfolio
   Aesthetic: Editorial Luxury / Swiss Minimal
   No gradients. No glow. Typography first.
   ══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400;1,600&family=IBM+Plex+Mono:wght@300;400;500&display=swap');

:root {
  --bg:      #0c0c0c;
  --book:    #111111;
  --spine:   #0a0a0a;
  --page-l:  #141414;
  --page-r:  #181818;
  --text:    #e8e3da;
  --muted:   #555555;
  --faint:   #252525;
  --line:    #282828;
  --accent:  #c9a96e;
  --white:   #f0ede8;
}

*, *::before, *::after { box-sizing: border-box; padding: 0; margin: 0; }
.clearfix::before, .clearfix::after { content: " "; display: table; }
.clearfix::after { clear: both; }
html, body { height: 100%; }

body {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  overflow: scroll;
  overflow-x: hidden;
}

a { color: var(--muted); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }

/* ── Layout ── */
.wrapper-table    { display: table; width: 100%; height: 100%; }
.wrapper-vertical { display: table-cell; vertical-align: middle; }
.wrapper-horizontal {
  min-height: 420px;
  width: 68%;
  max-width: 700px;
  margin: auto;
  position: relative;
}
.wrapper-square          { display: inline-block; position: relative; width: 100%; }
.wrapper-square-dummy    { margin-top: 100%; }
.wrapper-square-element  { position: absolute; top: 0; bottom: 0; left: 0; right: 0; }
.hidden { display: none; }

/* ══════════════════════════════════════════
   3D BOOK MECHANICS
   ══════════════════════════════════════════ */
.bk-book {
  position: absolute; width: 100%; height: 100%;
  font-size: 1.26em;
  transform-style: preserve-3d;
  transition: transform .5s, margin .5s;
}
.bk-book > div, .bk-front > div { display: block; position: absolute; }
.bk-front {
  transform-style: preserve-3d;
  transform-origin: 0% 50%;
  transition: transform .5s;
  transform: translate3d(0,0,20px);
  z-index: 10;
}
.bk-front > div { backface-visibility: hidden; transform-style: preserve-3d; }

/* ── FIX: was display:none which broke bookblock dimension calc on init.
         visibility:hidden keeps the element in layout so the plugin can
         measure it, but hides it visually until the book opens.          ── */
.bk-page {
  transform: translate3d(0,0,19px);
  visibility: hidden;
  pointer-events: none;
  width: 100%; height: 100%; overflow: hidden;
  backface-visibility: hidden; z-index: 9;
}

/* ── Show pages once the book is open ── */
.bk-viewinside .bk-page {
  visibility: visible;
  pointer-events: auto;
}

.bk-page > div { margin-left: -100%; }
.bk-front, .bk-back, .bk-front > div { width: 100%; height: 100%; }
.bk-left, .bk-right  { width: 40px; left: -20px; }
.bk-top, .bk-bottom  { width: 495px; height: 40px; top: -15px; backface-visibility: hidden; }
.bk-back     { transform: rotate3d(0,1,0,-180deg) translate3d(0,0,20px); }
.bk-cover-back { transform: rotate3d(0,1,0,-180deg); overflow: hidden; background: var(--spine); }
.bk-right    { height: 390px; top: 5px; transform: rotate3d(0,1,0,90deg) translate3d(0,0,295px); backface-visibility: hidden; }
.bk-left     { height: 100%; transform: rotate3d(0,1,0,-90deg); }
.bk-top      { transform: rotate3d(1,0,0,90deg); }
.bk-bottom   { transform: rotate3d(1,0,0,-90deg) translate3d(0,0,390px); }

.bk-viewinside { margin-left: 47%; }
.bk-viewinside .bk-front { transform: translate3d(0,0,20px) rotate3d(0,1,0,-160deg); }
.bk-book.bk-viewinside   { transform: translate3d(0,0,200px) rotate3d(0,1,0,0deg); }
.bk-book.bk-viewback     { transform: translate3d(0,0,0px) rotate3d(0,1,0,180deg); }
.bk-viewback .bk-back    { z-index: 10; }

.bk-front::after { content: ''; position: absolute; top: 1px; bottom: 1px; left: -1px; width: 0; }
.bk-cover::after, .bk-back::after {
  content: ''; position: absolute; top: 0; left: 10px; bottom: 0;
  width: 1px; background: rgba(255,255,255,0.04);
}
.bk-back::after { left: auto; right: 10px; }

.bk-book .bk-front > div,
.bk-book .bk-back,
.bk-book .bk-left,
.bk-book .bk-right,
.bk-book .bk-top,
.bk-book .bk-bottom,
.bk-book .bk-front::after { background-color: var(--spine); }

/* ══════════════════════════════════════════
   COVER
   ══════════════════════════════════════════ */
.bk-book .bk-cover {
  display: table; width: 100%; height: 100%;
  overflow: hidden; cursor: default;
  background: var(--book);
  background-image: radial-gradient(circle, #222 1px, transparent 1px);
  background-size: 20px 20px;
}
.bk-book .bk-cover .color-container {
  position: absolute; width: 100%; height: 7%;
  bottom: 0; left: 0; transition: top 0.5s, bottom 0.5s; cursor: pointer;
}
.bk-book .bk-cover .color-container.before  { top: 0; }
.bk-book .bk-cover .color-container.hidden  { bottom: -10%; display: block; }
.bk-book .bk-cover .color-container.before.hidden { top: -10%; display: block; }
.bk-book .bk-cover .color-square { width: 10%; height: 100%; display: block; float: left; }

.bk-book .bk-cover .bk-title { display: table-cell; vertical-align: middle; padding-left: 9%; }
.bk-book .bk-cover .bk-title div { display: block; width: auto; max-width: 88%; }

.cover-rule { display: block; width: 32px; height: 1px; background: var(--accent); margin-bottom: 10px; }
.cover-eyebrow {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.48em;
  color: var(--muted); letter-spacing: 0.12em; text-transform: uppercase;
  display: block; margin-bottom: 14px;
}
.cover-name {
  font-family: 'Cormorant Garamond', serif; font-weight: 300;
  font-size: 3.6em; line-height: 1.0; color: var(--white);
  letter-spacing: -0.01em; margin-bottom: 10px;
}
.cover-role {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.52em;
  letter-spacing: 0.08em; text-transform: uppercase; display: block; margin-bottom: 14px;
}
.cover-location {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.44em;
  color: var(--muted); letter-spacing: 0.06em; display: block; margin-top: 10px;
}
.highlight { color: var(--accent); }

.bk-book .bk-cover h3 {
  position: absolute; bottom: 13%; left: 0; text-align: center; width: 100%;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.52em; font-weight: 400;
  color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em;
}

/* ══════════════════════════════════════════
   PAGE SPREADS
   ══════════════════════════════════════════ */
.page-spread {
  width: 50%; height: 100%; float: left;
  background: var(--page-l); position: relative; overflow: hidden;
}
.page-spread.right-page { background: var(--page-r); border-left: 1px solid var(--line); }

.page-inner {
  padding: 10% 10% 8%; height: 100%;
  display: flex; flex-direction: column; position: relative; overflow: hidden;
}
.right-inner { align-items: flex-start; }

/* Folio line */
.folio-line { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.right-folio { justify-content: flex-end; }
.folio-num   { font-family: 'IBM Plex Mono', monospace; font-size: 0.44em; color: var(--accent); letter-spacing: 0.08em; }
.folio-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.44em; color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; }
.folio-line::before, .folio-line::after { content: ''; flex: 1; height: 1px; background: var(--line); }
.folio-line::before { display: none; }
.right-folio::after  { display: none; }
.right-folio::before { display: block; }

/* About block */
.about-block { display: flex; flex-direction: column; gap: 12px; flex: 1; }

.spread-heading {
  font-family: 'Cormorant Garamond', serif; font-weight: 300;
  font-size: 1.65em; line-height: 1.2; color: var(--white); margin-bottom: 6px;
}
.spread-heading em { font-style: italic; font-weight: 300; color: var(--accent); }

.body-text {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.55em;
  line-height: 1.8; color: var(--muted); font-weight: 300;
}

/* Skills */
.skills-block { display: flex; flex-direction: column; flex: 1; gap: 0; }
.skill-entry {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 7px 0; border-bottom: 1px solid var(--line);
}
.skill-name  { font-family: 'IBM Plex Mono', monospace; font-size: 0.52em; color: var(--text); font-weight: 400; }
.skill-level { font-family: 'IBM Plex Mono', monospace; font-size: 0.44em; color: var(--muted); font-weight: 300; text-transform: uppercase; letter-spacing: 0.06em; }
.skill-level.highlight { color: var(--accent); }

.avail-row  { display: flex; align-items: center; gap: 7px; margin-top: 12px; }
.avail-dot  {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }
.avail-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.46em; color: var(--muted); font-weight: 300; }

/* Project left page */
.proj-index-bg {
  font-family: 'Cormorant Garamond', serif; font-weight: 700; font-size: 7em;
  color: var(--faint); position: absolute; top: 14%; right: -2%;
  line-height: 1; pointer-events: none; user-select: none; letter-spacing: -0.05em;
}
.proj-content { display: flex; flex-direction: column; gap: 10px; flex: 1; position: relative; z-index: 1; }
.proj-year  { font-family: 'IBM Plex Mono', monospace; font-size: 0.45em; color: var(--muted); letter-spacing: 0.1em; }
.proj-title {
  font-family: 'Cormorant Garamond', serif; font-weight: 600;
  font-size: 1.7em; line-height: 1.1; color: var(--white); letter-spacing: -0.01em;
}
.proj-desc { font-family: 'IBM Plex Mono', monospace; font-size: 0.52em; line-height: 1.75; color: var(--muted); font-weight: 300; }
.proj-stack { display: flex; flex-wrap: wrap; gap: 5px; margin-top: auto; }
.stack-tag  {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.44em; color: var(--accent);
  border: 1px solid var(--faint); padding: 2px 7px; letter-spacing: 0.04em;
}
.proj-github {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.44em;
  letter-spacing: 0.04em; display: inline-block;
  transition: letter-spacing 0.2s; margin-top: 4px;
}
.proj-github:hover { letter-spacing: 0.09em; color: var(--accent); }

/* ══════════════════════════════════════════
   2×2 SCREENSHOT GRID
   ══════════════════════════════════════════ */
.ss-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-auto-rows: minmax(0, 1fr);
  gap: 5px;
  flex: 1;
  min-height: 0;
  height: 0;
  cursor: pointer;
}

.ss-cell {
  position: relative;
  overflow: hidden;
  background: var(--faint);
  border: 1px solid var(--line);
  transition: border-color 0.2s;
  min-height: 0;
  min-width: 0;
}

.ss-cell:hover {
  border-color: var(--accent);
}

.ss-cell img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  display: block;
  transition: transform 0.3s, opacity 0.2s;
  opacity: 0.9;
  z-index: 1;
}

.ss-cell:hover img {
  transform: scale(1.04);
  opacity: 1;
}

.ss-cell::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 16px 16px;
  opacity: 0.6;
  z-index: 0;
}

.ss-cell-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.42em;
  color: var(--muted);
  letter-spacing: 0.06em;
  position: absolute;
  bottom: 5px;
  left: 6px;
  z-index: 3;
  background: rgba(10,10,10,0.75);
  padding: 1px 5px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}

.ss-cell:hover .ss-cell-label {
  opacity: 1;
}

.ss-cell::after {
  content: '⤢';
  position: absolute;
  top: 5px; right: 7px;
  font-size: 0.55em;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 3;
  pointer-events: none;
}
.ss-cell:hover::after { opacity: 1; }

.proj-tagline {
  font-family: 'Cormorant Garamond', serif; font-weight: 300;
  font-size: 0.82em; line-height: 1.4; color: var(--muted);
  margin-top: 8px; flex-shrink: 0;
}
.proj-tagline em { font-style: italic; color: var(--text); font-weight: 300; }

/* Contact */
.contact-entries { display: flex; flex-direction: column; gap: 14px; margin-top: 8px; }
.contact-entry {
  display: flex; flex-direction: column; gap: 2px;
  padding-left: 10px; border-left: 1px solid var(--accent);
}
.c-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.42em; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; }
.c-val   { font-family: 'IBM Plex Mono', monospace; font-size: 0.52em; color: var(--text); font-weight: 400; }

/* End block */
.end-block { display: flex; flex-direction: column; justify-content: center; flex: 1; gap: 16px; }
.end-quote { font-family: 'Cormorant Garamond', serif; font-weight: 300; font-size: 1.4em; line-height: 1.4; color: var(--text); }
.end-quote em { font-style: italic; color: var(--accent); }
.end-sig { font-family: 'IBM Plex Mono', monospace; font-size: 0.5em; font-weight: 300; letter-spacing: 0.06em; }

/* ══════════════════════════════════════════
   BACK COVER
   ══════════════════════════════════════════ */
.bk-book .bk-back {
  display: table; overflow: hidden;
  background: var(--book);
  background-image: radial-gradient(circle, #1e1e1e 1px, transparent 1px);
  background-size: 20px 20px;
}
.back-inner { display: table-cell; vertical-align: middle; text-align: center; padding: 20px; }
.back-rule  { display: block; width: 32px; height: 1px; background: var(--accent); margin: 0 auto 16px; }
.back-mono  {
  font-family: 'Cormorant Garamond', serif; font-weight: 300; font-size: 5.5em;
  line-height: 1; display: block; margin-bottom: 12px; color: var(--accent); letter-spacing: -0.02em;
}
.back-sub   { font-family: 'IBM Plex Mono', monospace; font-size: 0.5em; color: var(--muted); font-weight: 300; line-height: 1.6; margin-bottom: 14px; }
.back-loc   { font-family: 'IBM Plex Mono', monospace; font-size: 0.44em; color: var(--faint); letter-spacing: 0.08em; text-transform: uppercase; margin-top: 10px; }

/* ══════════════════════════════════════════
   SCREENSHOT MODAL
   ══════════════════════════════════════════ */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(8, 8, 8, 0.94);
  z-index: 10000;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.modal-overlay.active { opacity: 1; pointer-events: all; }

.modal-box {
  width: min(90vw, 680px);
  background: var(--page-l);
  border: 1px solid var(--line);
  display: flex; flex-direction: column;
  transform: translateY(14px); transition: transform 0.3s;
}
.modal-overlay.active .modal-box { transform: translateY(0); }

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--line);
}
.modal-title-wrap   { display: flex; align-items: baseline; gap: 12px; }
.modal-proj-title   { font-family: 'Cormorant Garamond', serif; font-size: 1.1em; font-weight: 600; color: var(--white); }
.modal-counter      { font-family: 'IBM Plex Mono', monospace; font-size: 0.6em; color: var(--muted); font-weight: 300; }
.modal-close        {
  background: none; border: none; cursor: pointer;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.75em; color: var(--muted);
  padding: 4px 8px; transition: color 0.2s;
}
.modal-close:hover  { color: var(--accent); }

.modal-stage {
  display: flex; align-items: stretch;
  height: clamp(260px, 50vh, 420px);
}

.modal-arrow {
  background: none; border: none; cursor: pointer;
  font-family: 'IBM Plex Mono', monospace; font-size: 1.1em; color: var(--muted);
  padding: 0 18px; transition: color 0.2s, background 0.2s; flex-shrink: 0; z-index: 2;
}
.modal-arrow:hover { color: var(--accent); background: var(--faint); }

.modal-frame {
  flex: 1; position: relative; overflow: hidden;
  background: #0d0d0d;
}

.modal-screenshot {
  position: absolute; inset: 0;
  opacity: 0; transition: opacity 0.25s;
  display: flex; align-items: center; justify-content: center;
}
.modal-screenshot.active { opacity: 1; }

.modal-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  z-index: 2;
}

.ss-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 8px; background: #111;
  z-index: 1;
}
.ss-mockbody { width: 60%; display: flex; flex-direction: column; gap: 6px; }
.ss-mockbar  { height: 6px; background: var(--faint); }
.ss-mockbar.short  { width: 55%; background: #2a2a2a; }
.ss-mockbar.accent { width: 35%; background: var(--accent); opacity: 0.4; }
.ss-mockrow  { height: 4px; background: #1e1e1e; }
.ss-mockrow:nth-child(1) { width: 100%; }
.ss-mockrow:nth-child(2) { width: 80%; }
.ss-mockrow:nth-child(3) { width: 65%; }
.ss-mockrow:nth-child(4) { width: 90%; }

.ss-label {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.6em; color: var(--muted);
  position: absolute; bottom: 12px; left: 16px; letter-spacing: 0.06em;
  background: rgba(10,10,10,0.8); padding: 2px 6px;
}

.modal-dots { display: flex; justify-content: center; gap: 8px; padding: 12px 0; border-top: 1px solid var(--line); }
.modal-dot  {
  width: 5px; height: 5px; background: var(--faint); border-radius: 50%;
  cursor: pointer; transition: background 0.2s, transform 0.2s;
}
.modal-dot.active { background: var(--accent); transform: scale(1.4); }

/* ══════════════════════════════════════════
   BOOKBLOCK MECHANICS
   ══════════════════════════════════════════ */
.bb-bookblock {
  width: 200%; height: 100%; margin: 0 auto; overflow: hidden;
  position: relative; z-index: 100; perspective: 1300px; backface-visibility: hidden;
}
.bb-page { position: absolute; transform-style: preserve-3d; transition-property: transform; }
.bb-vertical .bb-page   { width: 50%; height: 100%; left: 50%; transform-origin: left center; }
.bb-horizontal .bb-page { width: 100%; height: 50%; top: 50%; transform-origin: center top; }
.bb-page > div, .bb-outer, .bb-content, .bb-inner { position: absolute; height: 100%; width: 100%; top: 0; left: 0; }
.bb-outer { backface-visibility: hidden; }
.bb-vertical .bb-content   { width: 200%; }
.bb-horizontal .bb-content { height: 200%; }
.bb-page > div { width: 100%; transform-style: preserve-3d; }
.bb-page > div:not(:only-child) { backface-visibility: hidden; }
.bb-vertical .bb-back   { transform: rotateY(-180deg); }
.bb-horizontal .bb-back { transform: rotateX(-180deg); }
.bb-outer { width: 100%; overflow: hidden; z-index: 999; }
.bb-overlay, .bb-flipoverlay { background-color: rgba(0,0,0,0.7); position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0; }
.bb-flipoverlay { background-color: rgba(0,0,0,0.2); }
.bb-bookblock.bb-vertical   > div.bb-page:first-child,
.bb-bookblock.bb-vertical   > div.bb-page:first-child .bb-back { transform: rotateY(180deg); }
.bb-bookblock.bb-horizontal > div.bb-page:first-child,
.bb-bookblock.bb-horizontal > div.bb-page:first-child .bb-back { transform: rotateX(180deg); }
.bb-vertical .bb-front .bb-content   { left: -100%; }
.bb-horizontal .bb-front .bb-content { top: -100%; }
.bb-vertical  .bb-flip-next, .bb-vertical  .bb-flip-initial { transform: rotateY(-180deg); }
.bb-vertical  .bb-flip-prev   { transform: rotateY(0deg); }
.bb-horizontal .bb-flip-next, .bb-horizontal .bb-flip-initial { transform: rotateX(180deg); }
.bb-horizontal .bb-flip-prev  { transform: rotateX(0deg); }
.bb-vertical  .bb-flip-next-end { transform: rotateY(-15deg); }
.bb-vertical  .bb-flip-prev-end { transform: rotateY(-165deg); }
.bb-horizontal .bb-flip-next-end { transform: rotateX(15deg); }
.bb-horizontal .bb-flip-prev-end { transform: rotateX(165deg); }
.bb-item { width: 100%; height: 100%; position: absolute; top: 0; left: 0; display: none; }
.no-js .bb-bookblock, .no-js ul.bb-custom-grid li { width: auto; height: auto; }
.no-js .bb-item { display: block; position: relative; }

/* Fallback layout when BookBlock plugin is unavailable */
.bk-book.bb-fallback .bk-page > div { margin-left: 0; }
.bk-book.bb-fallback .bb-bookblock { width: 100%; }
.bk-book.bb-fallback .bb-item {
  width: 100%;
  display: block;
  opacity: 0;
  pointer-events: none;
  transform: translateX(2%);
  transition: opacity 0.32s ease, transform 0.32s ease;
}
.bk-book.bb-fallback .bb-item.is-active {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}
.bk-book.bb-fallback.bk-viewinside { margin-left: 0; }
.bk-book.bb-fallback.bk-viewinside .bk-front { transform: translate3d(0,0,20px) rotate3d(0,1,0,-175deg); }

/* ══════════════════════════════════════════
   TINT PALETTE
   ══════════════════════════════════════════ */
.background-color-C9A96E { background-color: #C9A96E }
.background-color-B8955A { background-color: #B8955A }
.background-color-E8E3DA { background-color: #E8E3DA }
.background-color-C8C2B8 { background-color: #C8C2B8 }
.background-color-A8B8C8 { background-color: #A8B8C8 }
.background-color-7896A8 { background-color: #7896A8 }
.background-color-C8A0A0 { background-color: #C8A0A0 }
.background-color-A87878 { background-color: #A87878 }
.background-color-9AB89A { background-color: #9AB89A }
.background-color-6A986A { background-color: #6A986A }
.background-color-556070 { background-color: #556070 }
.background-color-3A4550 { background-color: #3A4550 }
.background-color-705560 { background-color: #705560 }
.background-color-503A45 { background-color: #503A45 }
.background-color-607055 { background-color: #607055 }
.background-color-455039 { background-color: #455039 }
.background-color-706050 { background-color: #706050 }
.background-color-504535 { background-color: #504535 }
.background-color-888888 { background-color: #888888 }
.background-color-555555 { background-color: #555555 }

/* ── Fallbacks ── */
.no-csstransforms3d .bk-book > div,
.no-csstransforms3d .bk-book .bk-cover-back { display: none; }
.no-csstransforms3d .bk-book > div.bk-front  { display: block; }

/* ── Responsive ── */
@media (max-width: 700px) {
  body { font-size: 15px; }
  .wrapper-horizontal { width: 92%; max-width: 640px; min-height: 390px; }
  .bk-book { font-size: 1.1em; }
}
@media (max-width: 430px) {
  body { font-size: 14px; }
  .wrapper-horizontal { min-height: 360px; }
  .bk-book { font-size: 1em; }
}