/* ============================================================
   Portfolio Book — 3D flip-through pages. Reuses landing theme
   tokens (:root vars) from styles.css loaded first.
   ============================================================ */

html, body { overflow-x: hidden; max-width: 100%; }
.bk-wrap { min-height: 100vh; display: flex; flex-direction: column; overflow-x: hidden; }

.bk-head { text-align: center; padding: 44px 20px 8px; }
.bk-head__title {
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.05; letter-spacing: -.03em; font-weight: 800;
  margin: 14px 0 12px;
}
.bk-head__sub { color: var(--muted); font-size: 15px; margin: 0; }

/* Stage + book */
.bk-stage {
  perspective: 2600px;
  display: flex; justify-content: center; align-items: center;
  flex: 1; padding: 26px 20px;
}
.bk-book {
  position: relative;
  width: min(440px, 90vw);
  aspect-ratio: 3 / 4;
  transform-style: preserve-3d;
  user-select: none;
}

/* A leaf turns around its left (spine) edge */
.bk-leaf {
  position: absolute; inset: 0;
  transform-origin: left center;
  transform-style: preserve-3d;
  transition: transform .85s cubic-bezier(.16,.84,.44,1);
  will-change: transform;
}
.bk-leaf.is-flipped { transform: rotateY(-180deg); }

.bk-face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid var(--border-2);
  border-radius: 4px 14px 14px 4px;
  overflow: hidden;
  background: var(--surface);
  display: flex; flex-direction: column;
  box-shadow: 0 30px 70px -30px rgba(0,0,0,.7);
}
/* faint spine shading */
.bk-face--front::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 26px;
  background: linear-gradient(90deg, rgba(0,0,0,.35), transparent);
  pointer-events: none; z-index: 3;
}
.bk-face--back {
  transform: rotateY(180deg);
  border-radius: 14px 4px 4px 14px;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,.015) 0 2px, transparent 2px 22px),
    var(--bg-alt);
}

/* Cover */
.bk-cover { align-items: center; justify-content: center; text-align: center; gap: 14px; padding: 36px 28px;
  background: radial-gradient(circle at 50% 22%, rgba(200,255,77,.10), transparent 60%), var(--surface); }
.bk-cover__photo {
  width: 120px; height: 120px; border-radius: 50%;
  overflow: hidden; border: 2px solid var(--border-2);
  display: grid; place-items: center;
  font-size: 40px; font-weight: 800; color: var(--accent);
  background: linear-gradient(150deg, var(--surface-2), #23232b);
}
.bk-cover__photo img { width: 100%; height: 100%; object-fit: cover; }
.bk-cover__name { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.bk-cover__title { font-size: clamp(30px, 8vw, 44px); font-weight: 800; letter-spacing: -.03em; margin: 0; }
.bk-cover__hint { margin-top: 8px; font-size: 13px; color: var(--muted); }

/* Project page */
.bk-proj { }
.bk-proj__img { position: relative; height: 52%; background: var(--surface-2); }
.bk-proj__img img { width: 100%; height: 100%; object-fit: cover; }
.bk-proj__grad { width: 100%; height: 100%; display: grid; place-items: center;
  font-family: 'Instrument Serif', serif; font-size: 64px; color: rgba(255,255,255,.85); }
.bk-proj__body { flex: 1; padding: 22px 24px; display: flex; flex-direction: column; gap: 7px; }
.bk-proj__no { font-family: 'Instrument Serif', serif; font-size: 26px; color: var(--accent); line-height: 1; }
.bk-proj__body h3 { font-size: 22px; font-weight: 800; letter-spacing: -.02em; margin: 0; }
.bk-proj__cat { font-size: 13px; color: var(--accent); font-weight: 600; }
.bk-proj__body p { font-size: 14px; color: var(--muted); margin: 4px 0 0; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.bk-proj__link { margin-top: auto; font-size: 14px; font-weight: 700; color: var(--accent); }

/* About page */
.bk-about { align-items: center; text-align: center; gap: 8px; padding: 26px 24px; overflow-y: auto; }
.bk-about__eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.bk-about__photo {
  width: 92px; height: 92px; border-radius: 50%; overflow: hidden;
  border: 2px solid var(--border-2); display: grid; place-items: center;
  font-size: 30px; font-weight: 800; color: var(--accent);
  background: linear-gradient(150deg, var(--surface-2), #23232b); margin: 4px 0;
}
.bk-about__photo img { width: 100%; height: 100%; object-fit: cover; }
.bk-about__name { font-size: 20px; font-weight: 800; letter-spacing: -.02em; }
.bk-about__role { font-size: 13px; font-weight: 600; color: var(--accent); }
.bk-about__bio { font-size: 13.5px; color: var(--muted); line-height: 1.5; margin: 6px 0 0; }
.bk-about__stats { display: flex; gap: 14px; margin-top: 16px; flex-wrap: wrap; justify-content: center; }
.bk-about__stats div { display: flex; flex-direction: column; }
.bk-about__stats strong { font-size: 19px; font-weight: 800; }
.bk-about__stats span { font-size: 11px; color: var(--muted); }

/* List pages (capabilities / process / experience / certificates) */
.bk-listpage { padding: 28px 26px; overflow-y: auto; gap: 0; }
.bk-lp__eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.bk-lp__title { font-size: 26px; font-weight: 800; letter-spacing: -.02em; margin: 8px 0 18px; }
.bk-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.bk-list__item { display: flex; align-items: flex-start; gap: 12px; }
.bk-list__icon { font-size: 20px; line-height: 1.2; flex: 0 0 auto; }
.bk-list__num { font-family: 'Instrument Serif', serif; font-size: 22px; color: var(--accent); line-height: 1; flex: 0 0 auto; min-width: 28px; }
.bk-list__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); margin-top: 8px; flex: 0 0 auto; }
.bk-list__text { display: flex; flex-direction: column; gap: 2px; }
.bk-list__text strong { font-size: 15px; font-weight: 700; letter-spacing: -.01em; }
.bk-list__text small { font-size: 12.5px; color: var(--muted); line-height: 1.4; }
.bk-list__period { color: var(--accent) !important; font-weight: 700; }
.bk-list__item--exp { padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.bk-list__item--exp:last-child { border-bottom: 0; }

/* Testimonials page */
.bk-quotes .bk-quote { margin: 0 0 16px; }
.bk-quote blockquote { margin: 0 0 8px; font-size: 14px; line-height: 1.5; color: var(--text); }
.bk-quote blockquote::before { content: "“"; color: var(--accent); }
.bk-quote blockquote::after { content: "”"; color: var(--accent); }
.bk-quote figcaption { display: flex; flex-direction: column; }
.bk-quote figcaption strong { font-size: 13.5px; }
.bk-quote figcaption small { font-size: 12px; color: var(--muted); }

/* End page */
.bk-end { align-items: center; justify-content: center; text-align: center; gap: 10px; padding: 32px 26px; overflow-y: auto; }
.bk-end h2 { font-size: 28px; font-weight: 800; letter-spacing: -.02em; margin: 0; }
.bk-end p { color: var(--muted); margin: 0; }
.bk-end__cta { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; width: 100%; max-width: 240px; }
.bk-links { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 22px; }
.bk-link {
  font-size: 12.5px; font-weight: 600; color: var(--text);
  padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--border-2); background: var(--surface);
  transition: border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}
.bk-link:hover { border-color: var(--accent); color: var(--accent); background: rgba(200,255,77,.06); }
.bk-link--cv { background: var(--accent); color: #0b0b0d; border-color: var(--accent); }

/* Controls */
.bk-controls { display: flex; align-items: center; justify-content: center; gap: 22px; padding: 8px 0 48px; }
.bk-btn {
  width: 52px; height: 52px; border-radius: 50%;
  border: 1px solid var(--border-2); background: var(--surface);
  color: var(--text); font-size: 24px; cursor: pointer;
  display: grid; place-items: center;
  transition: background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.bk-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.bk-btn:disabled { opacity: .35; cursor: default; transform: none; border-color: var(--border); color: var(--muted-2); }
.bk-counter { font-size: 14px; color: var(--muted); min-width: 56px; text-align: center; font-variant-numeric: tabular-nums; }

/* Mobile */
@media (max-width: 560px) {
  .bk-head { padding: 28px 16px 4px; }
  .bk-head__title { font-size: 25px; }
  .bk-head__sub { font-size: 13px; }
  .bk-stage { padding: 16px 14px; perspective: 1600px; }
  .bk-book { width: 88vw; max-width: 360px; aspect-ratio: 5 / 7; }
  .bk-cover { padding: 26px 18px; }
  .bk-cover__photo { width: 96px; height: 96px; }
  .bk-cover__title { font-size: 34px; }
  .bk-about { padding: 22px 16px; gap: 6px; }
  .bk-about__photo { width: 76px; height: 76px; }
  .bk-about__bio { font-size: 12.5px; }
  .bk-about__stats { gap: 10px; margin-top: 12px; }
  .bk-proj__img { height: 46%; }
  .bk-proj__body { padding: 16px 18px; }
  .bk-proj__body h3 { font-size: 19px; }
  .bk-proj__body p { -webkit-line-clamp: 3; font-size: 13px; }
  .bk-end { padding: 24px 18px; }
  .bk-end h2 { font-size: 24px; }
  .bk-links { gap: 6px; margin-top: 16px; }
  .bk-link { font-size: 11.5px; padding: 5px 10px; }
  .bk-btn { width: 46px; height: 46px; font-size: 22px; }
  .bk-controls { gap: 16px; padding-bottom: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  .bk-leaf { transition: none; }
}