/* ============================================================
   PORTFOLIO BOOK - 3D Closed Book → Opens on Click
   ============================================================ */

/* ── Section ── */
.pb-section {
    padding: 100px 0 80px;
    background: radial-gradient(ellipse at 50% 40%, rgba(255,107,0,0.04) 0%, transparent 60%), var(--bg-primary);
}
.pb-section .container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ── Header ── */
.pb-header { text-align: center; margin-bottom: 50px; }
.pb-subtitle {
    font-family: var(--font-sans); font-size: 0.82rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 3px; color: var(--gold); margin-bottom: 10px;
}
.pb-main-title {
    font-family: var(--font-serif); font-size: 2.5rem; font-weight: 700; color: var(--text-primary);
}

/* ════════════════════════════════════════════════
   3D BOOK SCENE
   ════════════════════════════════════════════════ */
.pb-scene {
    perspective: 2200px;
    perspective-origin: 50% 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 36px;
    min-height: 500px;
    padding: 20px 0;
    overflow: visible;
}

.pb-book-3d {
    width: 760px;
    height: 480px;
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(8deg) rotateY(-6deg);
    transform-origin: 50% 50%;
    transition: transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
    cursor: pointer;
    margin: 0 auto;
    flex-shrink: 0;
}
.pb-book-3d:hover {
    transform: rotateX(4deg) rotateY(-3deg) translateY(-6px);
}

/* ── Back Cover ── */
.pb-back-cover {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, #0d0d0d, #1a1a1a);
    border-radius: 4px 16px 16px 4px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.6), 0 8px 20px rgba(0,0,0,0.4);
    transform: translateZ(-2px);
}

/* ── Page Edges (right side, visible when closed) ── */
.pb-edges {
    position: absolute;
    top: 6px; right: -4px;
    width: 16px; height: calc(100% - 12px);
    transform: rotateY(0deg);
    transform-origin: left center;
    z-index: 2;
}
.pb-edge {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(to right, #1e1e1e, #2a2a2a, #1e1e1e);
    border-radius: 0 2px 2px 0;
}
.pb-edge:nth-child(1) { transform: translateX(0px); }
.pb-edge:nth-child(2) { transform: translateX(3px); background: linear-gradient(to right, #222, #2e2e2e, #222); }
.pb-edge:nth-child(3) { transform: translateX(6px); background: linear-gradient(to right, #252525, #313131, #252525); }
.pb-edge:nth-child(4) { transform: translateX(9px); background: linear-gradient(to right, #282828, #343434, #282828); }
.pb-edge:nth-child(5) { transform: translateX(12px); background: linear-gradient(to right, #2b2b2b, #373737, #2b2b2b); }

/* ── Spine ── */
.pb-spine-3d {
    position: absolute;
    top: 4%; left: -18px;
    width: 20px; height: 92%;
    background: linear-gradient(to right, #111, #1a1a1a, #222, #1a1a1a, #111);
    border-radius: 4px 0 0 4px;
    transform: rotateY(90deg);
    transform-origin: right center;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: -3px 0 10px rgba(0,0,0,0.4);
}
.pb-spine-3d span {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-serif);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--gold);
    letter-spacing: 3px;
    text-transform: uppercase;
    opacity: 0.7;
}

/* ── Front Cover ── */
.pb-front-cover {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(145deg, #fafafa 0%, #f0f0f0 40%, #e8e8e8 100%);
    border-radius: 4px 16px 16px 4px;
    border: 1px solid rgba(0,0,0,0.08);
    transform-origin: left center;
    transform-style: preserve-3d;
    z-index: 10;
    transition: transform 0.9s cubic-bezier(0.645, 0.045, 0.355, 1),
                box-shadow 0.9s ease;
    box-shadow:
        5px 5px 25px rgba(0,0,0,0.25),
        15px 15px 40px rgba(0,0,0,0.15),
        inset 0 0 80px rgba(255,255,255,0.5);
    cursor: pointer;
}
.pb-front-cover::before {
    content: '';
    position: absolute;
    inset: 10px;
    border: 1.5px solid rgba(255,107,0,0.2);
    border-radius: 2px 12px 12px 2px;
    pointer-events: none;
}
.pb-front-cover::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0.2) 30%, transparent 60%);
    border-radius: 4px 16px 16px 4px;
    pointer-events: none;
}

/* Cover opening animation */
.pb-book-3d.opening .pb-front-cover {
    transform: rotateY(-165deg);
    box-shadow: -5px 5px 30px rgba(0,0,0,0.3);
}

/* Cover glow pulse when closed */
.pb-book-3d:not(.opening) .pb-front-cover {
    animation: pbCoverGlow 3s ease-in-out infinite;
}
@keyframes pbCoverGlow {
    0%, 100% { box-shadow: 5px 5px 25px rgba(0,0,0,0.25), 15px 15px 40px rgba(0,0,0,0.15), inset 0 0 80px rgba(255,255,255,0.5); }
    50% { box-shadow: 5px 5px 30px rgba(0,0,0,0.3), 15px 15px 50px rgba(0,0,0,0.2), inset 0 0 80px rgba(255,255,255,0.6), 0 0 30px rgba(255,107,0,0.08); }
}

/* ── Cover Inner Content ── */
.pb-cover-inner {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
}
.pb-cover-top-line {
    width: 60px; height: 2px;
    background: linear-gradient(135deg, #e55a00, #ff6b00, #ff8c33);
    margin-bottom: 28px;
    opacity: 0.6;
}
.pb-cover-emblem { margin-bottom: 22px; }
.pb-cover-circle {
    width: 100px; height: 100px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid #ff6b00;
    box-shadow: 0 0 20px rgba(255,107,0,0.2), 0 0 40px rgba(255,107,0,0.1);
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.4s ease;
    flex-shrink: 0;
}
.pb-book-3d:hover .pb-cover-circle {
    transform: scale(1.08);
    box-shadow: 0 0 30px rgba(255,107,0,0.3), 0 0 60px rgba(255,107,0,0.15);
}
.pb-cover-circle img {
    width: 100%; height: 100%; object-fit: cover;
    display: block;
}

.pb-cover-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: #1a1a1a;
    line-height: 1.15;
    margin: 0 0 14px;
}
.pb-cover-title span {
    font-size: 1.1rem;
    font-weight: 600;
    color: #ff6b00;
    letter-spacing: 2px;
    text-transform: uppercase;
    display: block;
    margin-top: 4px;
}
.pb-cover-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}
.pb-cover-divider span {
    width: 40px; height: 1px;
    background: linear-gradient(135deg, #e55a00, #ff6b00);
    opacity: 0.4;
}
.pb-cover-diamond {
    width: 7px !important; height: 7px !important;
    background: #ff6b00 !important;
    transform: rotate(45deg);
    opacity: 1 !important;
    flex-shrink: 0;
}
.pb-cover-tagline {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    color: #666;
    letter-spacing: 1px;
    margin: 0 0 20px;
}
.pb-cover-year {
    font-family: var(--font-serif);
    font-size: 0.8rem;
    color: #ff6b00;
    letter-spacing: 4px;
    opacity: 0.5;
    margin-bottom: 24px;
}
.pb-cover-bottom-line {
    width: 40px; height: 1px;
    background: #999;
    opacity: 0.3;
    margin-bottom: 20px;
}
.pb-cover-click-hint {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    color: #ff6b00;
    opacity: 0.8;
    animation: pbHintBounce 2s ease-in-out infinite;
    transition: opacity 0.3s;
}
.pb-cover-click-hint i { margin-right: 4px; }
.pb-book-3d.opening .pb-cover-click-hint { opacity: 0; }

@keyframes pbHintBounce {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50% { transform: translateY(-4px); opacity: 1; }
}

/* ════════════════════════════════════════════════
   SPREADS (visible after book opens)
   ════════════════════════════════════════════════ */
.pb-spread {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex;
    transform-style: preserve-3d;
    opacity: 0;
    pointer-events: none;
    z-index: 1;
}
.pb-spread.visible {
    opacity: 1;
    pointer-events: auto;
}
.pb-spread.active {
    z-index: 5;
}
.pb-spread.active .pb-right {
    transform-origin: left center;
    transform-style: preserve-3d;
}

/* ── Left & Right halves ── */
.pb-left, .pb-right {
    width: 50%; height: 100%;
    position: relative;
    overflow: hidden;
}
.pb-left { border-radius: 4px 0 0 4px; }
.pb-right { border-radius: 0 16px 16px 0; }

/* Page inner content */
.pb-page-inner {
    position: absolute;
    inset: 0;
    padding: 30px 34px;
    box-sizing: border-box;
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--bg-card);
    scrollbar-width: thin;
    scrollbar-color: var(--gold-dark) transparent;
}
.pb-page-inner::-webkit-scrollbar { width: 3px; }
.pb-page-inner::-webkit-scrollbar-thumb { background: var(--gold-dark); border-radius: 2px; }

/* Page depth shadows */
.pb-left .pb-page-inner {
    border-right: 1px solid rgba(0,0,0,0.12);
    box-shadow: inset -10px 0 25px -10px rgba(0,0,0,0.15), 0 4px 20px rgba(0,0,0,0.3);
}
.pb-right .pb-page-inner {
    border-left: 1px solid rgba(255,107,0,0.04);
    box-shadow: inset 8px 0 20px -8px rgba(0,0,0,0.08), 0 4px 20px rgba(0,0,0,0.3);
}

/* Right page curl shadow */
.pb-right::after {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 25px; height: 100%;
    background: linear-gradient(to left, rgba(0,0,0,0.06), transparent);
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.3s;
}
.pb-right:hover::after { opacity: 1; }

/* ── Flip Animation ── */
.pb-right.flipping {
    animation: pbFlip 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
.pb-right.flipping-back {
    animation: pbFlipBack 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes pbFlip {
    0%   { transform: rotateY(0deg); }
    100% { transform: rotateY(-180deg); }
}
@keyframes pbFlipBack {
    0%   { transform: rotateY(-180deg); }
    100% { transform: rotateY(0deg); }
}

/* ════════════════════════════════════════════════
   PAGE CONTENT STYLES
   ════════════════════════════════════════════════ */

/* Page header */
.pb-pg-head { margin-bottom: 18px; }
.pb-pg-num {
    font-family: var(--font-serif); font-size: 0.72rem; font-weight: 700;
    color: var(--gold); opacity: 0.5; display: block; margin-bottom: 2px;
}
.pb-pg-head h3 {
    font-family: var(--font-serif); font-size: 1.4rem; font-weight: 700;
    color: var(--text-primary); margin: 0;
}
.pb-pg-rule {
    width: 36px; height: 3px; background: var(--gold-gradient);
    border-radius: 2px; margin-top: 8px;
}

/* ── About ── */
.pb-about-row-wrap { display: flex; gap: 18px; align-items: flex-start; }
.pb-about-pic {
    width: 100px; height: 100px; border-radius: 10px; overflow: hidden; flex-shrink: 0;
    border: 2px solid var(--border-color); box-shadow: 0 4px 14px rgba(255,107,0,0.1);
}
.pb-about-pic img { width: 100%; height: 100%; object-fit: cover; }
.pb-about-info p {
    font-family: var(--font-sans); font-size: 0.78rem; line-height: 1.6;
    color: var(--text-secondary); margin: 0 0 12px;
}
.pb-about-attr {
    font-family: var(--font-sans); font-size: 0.72rem; color: var(--text-secondary);
    margin-bottom: 6px;
}
.pb-about-attr .gold { font-weight: 600; margin-right: 4px; }

/* ── Timeline ── */
.pb-timeline { position: relative; padding-left: 18px; }
.pb-timeline::before {
    content: ''; position: absolute; left: 4px; top: 6px; bottom: 6px;
    width: 2px; background: linear-gradient(to bottom, var(--gold), var(--border-color), transparent);
}
.pb-tl-node { position: relative; margin-bottom: 14px; }
.pb-tl-node:last-child { margin-bottom: 0; }
.pb-tl-dot {
    position: absolute; left: -17px; top: 5px;
    width: 7px; height: 7px; border-radius: 50%; background: var(--gold);
    box-shadow: 0 0 6px rgba(255,107,0,0.3);
}
.pb-tl-text span {
    font-family: var(--font-sans); font-size: 0.58rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 1.2px;
}
.pb-tl-text h4 {
    font-family: var(--font-sans); font-size: 0.8rem; font-weight: 700;
    color: var(--text-primary); margin: 2px 0;
}
.pb-tl-text p {
    font-family: var(--font-sans); font-size: 0.68rem; color: var(--text-secondary);
    line-height: 1.5; margin: 0;
}

/* ── Skills ── */
.pb-bars { display: flex; flex-direction: column; gap: 11px; }
.pb-bar { display: flex; flex-direction: column; gap: 4px; }
.pb-bar-h {
    display: flex; justify-content: space-between;
    font-family: var(--font-sans); font-size: 0.72rem; font-weight: 500; color: var(--text-primary);
}
.pb-bar-track {
    height: 5px; background: var(--bg-lighter); border-radius: 3px; overflow: hidden;
}
.pb-bar-fill {
    height: 100%; background: var(--gold-gradient); border-radius: 3px;
    width: 0%; transition: width 1.2s cubic-bezier(0.23, 1, 0.32, 1);
    box-shadow: 0 0 6px rgba(255,107,0,0.2);
}
.pb-bar-fill.go { width: var(--tw); }

/* ── Projects ── */
.pb-proj-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.pb-proj {
    border-radius: 8px; overflow: hidden; background: var(--bg-lighter);
    border: 1px solid var(--border-color); transition: all 0.3s;
}
.pb-proj:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(255,107,0,0.12); border-color: var(--gold); }
.pb-proj-thumb { position: relative; height: 85px; overflow: hidden; }
.pb-proj-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.pb-proj:hover .pb-proj-thumb img { transform: scale(1.08); }
.pb-proj-over {
    position: absolute; inset: 0; background: rgba(10,10,10,0.7);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; transition: opacity 0.3s;
}
.pb-proj:hover .pb-proj-over { opacity: 1; }
.pb-proj-over a, .pb-proj-over span {
    width: 30px; height: 30px; border-radius: 50%; border: 2px solid var(--gold);
    display: flex; align-items: center; justify-content: center;
    color: var(--gold); font-size: 0.65rem; text-decoration: none; transition: all 0.3s;
}
.pb-proj-over a:hover { background: var(--gold); color: #0a0a0a; }
.pb-proj-meta { padding: 8px 10px; }
.pb-tag {
    font-family: var(--font-sans); font-size: 0.52rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.5px;
    padding: 2px 7px; border-radius: 50px; display: inline-block; margin-bottom: 3px;
}
.tag-web { background: rgba(59,130,246,0.12); color: #60a5fa; }
.tag-pos { background: rgba(34,197,94,0.12); color: #4ade80; }
.tag-ai  { background: rgba(168,85,247,0.12); color: #c084fc; }
.pb-proj-meta h4 {
    font-family: var(--font-sans); font-size: 0.74rem; font-weight: 700;
    color: var(--text-primary); margin: 0 0 2px;
}
.pb-proj-meta p {
    font-family: var(--font-sans); font-size: 0.62rem; color: var(--text-secondary);
    margin: 0; line-height: 1.3;
}

/* ── Services ── */
.pb-svc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.pb-svc {
    padding: 14px 10px; border-radius: 8px; background: var(--bg-lighter);
    border: 1px solid var(--border-color); text-align: center;
    transition: all 0.3s; position: relative; overflow: hidden;
}
.pb-svc::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(255,107,0,0.07), transparent);
    opacity: 0; transition: opacity 0.3s;
}
.pb-svc:hover::before { opacity: 1; }
.pb-svc:hover { transform: translateY(-4px); border-color: var(--gold); box-shadow: 0 6px 18px rgba(255,107,0,0.1); }
.pb-svc-ic {
    width: 34px; height: 34px; border-radius: 9px; background: var(--gold-gradient);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 8px; font-size: 0.9rem; color: #0a0a0a;
    transition: transform 0.3s, box-shadow 0.3s;
}
.pb-svc:hover .pb-svc-ic { transform: scale(1.1) rotate(-5deg); box-shadow: 0 3px 10px rgba(255,107,0,0.3); }
.pb-svc h4 {
    font-family: var(--font-sans); font-size: 0.72rem; font-weight: 700;
    color: var(--text-primary); margin: 0 0 3px; transition: color 0.3s;
}
.pb-svc:hover h4 { color: var(--gold); }
.pb-svc p {
    font-family: var(--font-sans); font-size: 0.62rem; color: var(--text-secondary);
    margin: 0; line-height: 1.4;
}

/* ── Contact ── */
.pb-contact-page { text-align: center; }
.pb-contact-msg {
    font-family: var(--font-sans); font-size: 0.82rem; color: var(--text-secondary);
    line-height: 1.6; margin: 0 0 16px;
}
.pb-contact-cards { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; margin-bottom: 16px; }
.pb-c-card {
    padding: 12px 6px; border-radius: 8px; background: var(--bg-lighter);
    border: 1px solid var(--border-color); transition: all 0.3s;
}
.pb-c-card:hover { transform: translateY(-3px); border-color: var(--gold); }
.pb-c-ic {
    width: 30px; height: 30px; border-radius: 50%; background: var(--gold-gradient);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 6px; font-size: 0.75rem; color: #0a0a0a;
}
.pb-c-card h4 {
    font-family: var(--font-sans); font-size: 0.65rem; font-weight: 700;
    color: var(--text-primary); margin: 0 0 2px; text-transform: uppercase; letter-spacing: 0.8px;
}
.pb-c-card p {
    font-family: var(--font-sans); font-size: 0.58rem; color: var(--text-secondary);
    margin: 0; word-break: break-all;
}
.pb-socials { display: flex; justify-content: center; gap: 7px; margin-bottom: 14px; }
.pb-socials a {
    width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-secondary); text-decoration: none; font-size: 0.75rem; transition: all 0.3s;
}
.pb-socials a:hover { background: var(--gold); border-color: var(--gold); color: #0a0a0a; transform: translateY(-2px); }
.pb-cta { padding: 9px 24px !important; font-size: 0.75rem !important; }

/* ── End Page (right side of last spread) ── */
.pb-right-empty .pb-page-inner {
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--bg-card), var(--bg-lighter));
}
.pb-end-text { text-align: center; }
.pb-end-line { width: 40px; height: 1px; background: var(--gold-gradient); opacity: 0.3; margin: 0 auto 10px; }
.pb-end-text p {
    font-family: var(--font-serif); font-size: 1rem; font-weight: 600;
    color: var(--text-muted); letter-spacing: 1px; margin: 0;
}

/* ════════════════════════════════════════════════
   BOTTOM CONTROLS
   ════════════════════════════════════════════════ */
.pb-controls {
    display: flex; align-items: center; justify-content: center; gap: 20px;
    margin-bottom: 14px;
    opacity: 0; transform: translateY(10px);
    transition: opacity 0.5s 0.5s, transform 0.5s 0.5s;
    pointer-events: none;
}
.pb-controls.show {
    opacity: 1; transform: translateY(0); pointer-events: auto;
}
.pb-nav-btn {
    display: flex; align-items: center; gap: 5px;
    padding: 9px 18px; border-radius: 6px;
    border: 1px solid var(--border-color); background: var(--bg-card);
    color: var(--gold); font-family: var(--font-sans); font-size: 0.75rem;
    font-weight: 600; cursor: pointer; transition: all 0.3s; text-transform: uppercase;
    letter-spacing: 1px;
}
.pb-nav-btn:hover { background: var(--gold); color: #0a0a0a; border-color: var(--gold); box-shadow: 0 0 14px rgba(255,107,0,0.3); }
.pb-nav-btn:active { transform: scale(0.96); }
.pb-nav-btn:disabled { opacity: 0.3; cursor: not-allowed; pointer-events: none; }
.pb-nav-btn i { font-size: 0.65rem; }

.pb-dots { display: flex; gap: 7px; }
.pb-dot {
    width: 9px; height: 9px; border-radius: 50%;
    background: var(--bg-lighter); border: 2px solid var(--border-color);
    cursor: pointer; transition: all 0.3s;
}
.pb-dot.active { background: var(--gold); border-color: var(--gold); box-shadow: 0 0 6px rgba(255,107,0,0.4); }
.pb-dot:hover { border-color: var(--gold); }

/* ── Close Book Button ── */
.pb-close-btn {
    position: absolute;
    top: 16px; right: 16px;
    width: 36px; height: 36px;
    border-radius: 50%;
    border: 1.5px solid var(--border-color);
    background: var(--bg-card);
    color: var(--gold);
    font-size: 0.85rem;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    z-index: 60;
    opacity: 0; transform: scale(0.8) rotate(90deg);
    transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    pointer-events: none;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}
.pb-close-btn.show {
    opacity: 1; transform: scale(1) rotate(0deg);
    pointer-events: auto;
}
.pb-close-btn:hover {
    background: #ff6b00; color: #fff; border-color: #ff6b00;
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 4px 15px rgba(255,107,0,0.4);
}

/* Book closing animation */
.pb-book-3d.closing .pb-front-cover {
    transform: rotateY(0deg);
    transition: transform 0.8s cubic-bezier(0.645, 0.045, 0.355, 1);
}
.pb-book-3d.closing .pb-spread {
    opacity: 0 !important;
    transition: opacity 0.3s ease;
}

/* ════════════════════════════════════════════════
   LIGHT THEME
   ════════════════════════════════════════════════ */
.light-theme .pb-page-inner { background: #fff; }
.light-theme .pb-left .pb-page-inner { border-right-color: rgba(0,0,0,0.06); }
.light-theme .pb-right .pb-page-inner { border-left-color: rgba(0,0,0,0.03); }
.light-theme .pb-front-cover { background: linear-gradient(145deg, #fafafa 0%, #f0f0f0 40%, #e8e8e8 100%); border-color: rgba(0,0,0,0.08); }
.light-theme .pb-front-cover::before { border-color: rgba(255,107,0,0.15); }
.light-theme .pb-front-cover::after { background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.3) 30%, transparent 60%); }
.light-theme .pb-cover-title { color: #1a1a1a; }
.light-theme .pb-cover-title span { color: #ff6b00; }
.light-theme .pb-cover-tagline { color: #666; }
.light-theme .pb-cover-click-hint { color: #ff6b00; }
.light-theme .pb-back-cover { background: linear-gradient(135deg, #e8e8e8, #f0f0f0); }
.light-theme .pb-edge, .light-theme .pb-edge:nth-child(2), .light-theme .pb-edge:nth-child(3), .light-theme .pb-edge:nth-child(4), .light-theme .pb-edge:nth-child(5) { background: linear-gradient(to right, #e0e0e0, #eee, #e0e0e0); }
.light-theme .pb-spine-3d { background: linear-gradient(to right, #ccc, #ddd, #ccc); }
.light-theme .pb-proj, .light-theme .pb-svc, .light-theme .pb-c-card { background: #f5f5f5; border-color: rgba(0,0,0,0.06); }
.light-theme .pb-bar-track { background: #e8e8e8; }
.light-theme .pb-dot { background: #e0e0e0; border-color: #ccc; }
.light-theme .pb-nav-btn { background: #fff; }
.light-theme .pb-close-btn { background: #fff; border-color: rgba(0,0,0,0.1); }

/* ════════════════════════════════════════════════
   RESPONSIVE
   ════════════════════════════════════════════════ */
@media (max-width: 900px) {
    .pb-book-3d { width: 100%; max-width: 620px; height: 420px; }
    .pb-page-inner { padding: 24px 26px; }
    .pb-cover-title { font-size: 1.6rem; }
    .pb-about-row-wrap { flex-direction: column; gap: 12px; }
    .pb-about-pic { width: 80px; height: 80px; margin: 0 auto; }
}
@media (max-width: 700px) {
    .pb-section { padding: 60px 0 50px; }
    .pb-main-title { font-size: 2rem; }
    .pb-header { margin-bottom: 36px; }
    .pb-book-3d { height: 380px; transform: rotateX(5deg) rotateY(-3deg); transform-origin: 50% 50%; }
    .pb-book-3d:hover { transform: rotateX(3deg) rotateY(-1deg) translateY(-4px); }
    .pb-page-inner { padding: 20px 20px; }
    .pb-pg-head h3 { font-size: 1.15rem; }
    .pb-cover-circle { width: 70px; height: 70px; }
    .pb-cover-title { font-size: 1.4rem; }
    .pb-proj-grid { gap: 8px; }
    .pb-proj-thumb { height: 70px; }
    .pb-svc-grid { gap: 6px; }
    .pb-contact-cards { grid-template-columns: 1fr; gap: 6px; }
    .pb-controls { gap: 12px; }
    .pb-nav-btn span { display: none; }
    .pb-nav-btn { padding: 9px 12px; }
}
@media (max-width: 480px) {
    .pb-book-3d { height: 340px; transform: rotateX(3deg) rotateY(-2deg); transform-origin: 50% 50%; }
    .pb-page-inner { padding: 16px 16px; }
    .pb-cover-title { font-size: 1.2rem; }
    .pb-cover-title span { font-size: 0.85rem; }
    .pb-cover-tagline { font-size: 0.6rem; }
    .pb-svc-grid { grid-template-columns: 1fr; }
    .pb-svc { display: flex; align-items: center; gap: 8px; text-align: left; padding: 10px 12px; }
    .pb-svc-ic { margin: 0; flex-shrink: 0; width: 28px; height: 28px; font-size: 0.8rem; }
    .pb-edge { display: none; }
    .pb-edges { width: 8px; }
}