::-webkit-scrollbar {
    display: none;
}

html, body {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.bk-section {
    padding: 5rem 0;
}

.bk-section-white {
    background: var(--bg);
}

.bk-section-soft {
    background: var(--bg-soft);
}

.bk-container {
    max-width: 72rem;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.bk-narrow {
    max-width: 48rem;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.bk-center {
    text-align: center;
}

.mb-16 {
    margin-bottom: 4rem;
}

.bk-hero {
    height: 70vh;
    background: var(--bg-hero-gradient);
    color: #fff;
    display: grid;
    place-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 5rem;
}

.bk-hero-bg {
    position: absolute;
    inset: 0;
    opacity: .12;
}

.bk-shape {
    position: absolute;
    border-radius: 9999px;
    background: #fff;
    filter: blur(20px);
    animation: float 8s ease-in-out infinite;
}

.bk-shape-1 {
    top: 20%;
    left: 10%;
    width: 8rem;
    height: 8rem;
}

.bk-shape-2 {
    bottom: 25%;
    right: 12%;
    width: 12rem;
    height: 12rem;
    animation-delay: -2s;
    filter: blur(30px);
}

.bk-shape-3 {
    top: 50%;
    left: 35%;
    width: 6rem;
    height: 6rem;
    background: var(--brand-teal);
    animation-delay: -4s;
    filter: blur(16px);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0);
    }

    50% {
        transform: translateY(-12px) translateX(6px);
    }
}

.bk-hero-content {
    text-align: center;
    max-width: 64rem;
    padding: 0 1.5rem;
    position: relative;
    z-index: 1;
}

.bk-hero-icon {
    width: 5rem;
    height: 5rem;
    border-radius: 9999px;
    background: rgba(255,255,255,.2);
    display: grid;
    place-items: center;
    margin: 0 auto 1.5rem auto;
}

    .bk-hero-icon i {
        font-size: 1.75rem;
        color: #fff;
    }

.bk-pulse {
    animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255,255,255,.35);
    }

    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 18px rgba(255,255,255,0);
    }
}

.bk-hero-title {
    font-size: clamp(2.5rem, 6vw, 4.25rem);
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.bk-hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    opacity: .9;
    font-weight: 300;
    margin-bottom: 1rem;
}

.bk-hero-desc {
    font-size: 1.0625rem;
    opacity: .85;
    max-width: 40rem;
    margin: 0 auto;
}

.bk-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 800;
    margin: 0 0 .5rem;
}

.bk-subtitle {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    margin: 0.5rem 0 1rem;
}

.bk-text {
    color: var(--text-soft);
    font-size: 1.0625rem;
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

.bk-muted {
    color: var(--text-soft);
    font-size: 1.0625rem;
}

.bk-narrow-text {
    max-width: 40rem;
    margin: 0 auto;
}

.bk-gradient-text {
    background: linear-gradient(90deg, var(--brand-blue), var(--brand-purple));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.bk-grid-2 {
    display: grid;
    gap: 3rem;
}

.bk-grid-3 {
    display: grid;
    gap: 1rem;
}

@media (min-width: 768px) {
    .bk-grid-2 {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }

    .md\:bk-order-1 {
        order: 1;
    }

    .md\:bk-order-2 {
        order: 2;
    }
}

@media (min-width: 1024px) {
    .bk-grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

.bk-panel {
    background: var(--bg-soft);
    border-radius: 1.5rem;
    padding: clamp(1.25rem, 3vw, 3rem);
    box-shadow: var(--shadow);
}

    .bk-panel.soft {
        padding: 2rem;
        border-radius: 1.25rem;
    }

.bk-btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    color: #fff;
    border: none;
    border-radius: .875rem;
    padding: 1rem 2rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease;
    box-shadow: var(--shadow);
}

.bk-card-hover {
    transition: transform .18s ease, box-shadow .18s ease;
}

    .bk-card-hover:hover {
        transform: translateY(-4px);
        box-shadow: 0 16px 35px rgba(0,0,0,.12);
    }

.bk-gradient-bg {
    background: linear-gradient(90deg, var(--brand-blue), var(--brand-purple));
}

.bk-chip {
    display: inline-block;
    background: linear-gradient(90deg, var(--brand-blue), var(--brand-purple));
    color: #fff;
    padding: .5rem .9rem;
    border-radius: 9999px;
    font-size: .8125rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.bk-bullets {
    display: grid;
    gap: .75rem;
    margin-bottom: 1.5rem;
}

.bk-bullet {
    display: flex;
    align-items: center;
    gap: .625rem;
    color: var(--text);
}

.bk-bullet-icon {
    color: var(--brand-teal);
}

.bk-meta {
    display: flex;
    gap: 2rem;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.bk-meta-caption {
    font-size: .85rem;
    color: var(--muted);
    margin: 0;
}

.bk-meta-value {
    font-weight: 700;
    margin: .125rem 0 0;
}

.bk-book-visual {
    display: flex;
    justify-content: center;
}

.bk-book {
    position: relative;
}

.bk-book-img {
    width: 22rem;
    height: 26rem;
    object-fit: cover;
    border-radius: .75rem;
    box-shadow: 0 25px 60px rgba(0,0,0,.2);
}

.bk-badge {
    position: absolute;
    top: -10px;
    right: -10px;
    background: #facc15;
    color: #111827;
    padding: .25rem .75rem;
    border-radius: 9999px;
    font-weight: 800;
    font-size: .85rem;
    transform: rotate(12deg);
}

.bk-card {
    background: var(--elev);
    border-radius: 1.25rem;
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.bk-card-row {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    cursor: pointer;
}

.bk-card-cover {
    width: 5rem;
    height: 7rem;
    object-fit: cover;
    border-radius: .75rem;
    box-shadow: 0 10px 20px rgba(0,0,0,.15);
    flex-shrink: 0;
}

.bk-card-body {
    flex: 1;
}

.bk-card-title {
    font-weight: 800;
    font-size: 1.05rem;
    margin: 0 0 .4rem;
    color: var(--text);
}

.bk-card-text {
    color: var(--text-soft);
    font-size: .95rem;
    margin: 0 0 .6rem;
}

.bk-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bk-tag {
    font-size: .75rem;
    padding: .25rem .5rem;
    border-radius: 9999px;
    font-weight: 700;
}

.bk-tag-blue {
    background: color-mix(in srgb, var(--brand-blue) 12%, transparent);
    color: var(--brand-blue);
}

.bk-tag-purple {
    background: color-mix(in srgb, var(--brand-purple) 12%, transparent);
    color: var(--brand-purple);
}

.bk-tag-teal {
    background: color-mix(in srgb, var(--brand-teal) 12%, transparent);
    color: var(--brand-teal);
}

.bk-tag-orange {
    background: #fff4ec;
    color: #d97706;
}

.bk-tag-green {
    background: #ecfdf5;
    color: #16a34a;
}

.bk-tag-red {
    background: #fee2e2;
    color: #dc2626;
}

.bk-year {
    font-size: .8rem;
    color: var(--muted);
}

.bk-stats {
    display: grid;
    grid-template-columns: repeat(2,1fr);
    gap: 1.25rem;
    text-align: center;
}

@media (min-width: 768px) {
    .bk-stats {
        grid-template-columns: repeat(4,1fr);
    }
}

.bk-stat-value {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: .25rem;
}

.bk-stat-label {
    font-size: .85rem;
    color: var(--text-soft);
    margin: 0;
}

.bk-feature {
    text-align: center;
    background: var(--bg-soft);
    border-radius: 1.25rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.bk-feature-icon {
    width: 4rem;
    height: 4rem;
    border-radius: 9999px;
    display: grid;
    place-items: center;
    margin: 0 auto 1rem auto;
    color: #fff;
    font-size: 1.25rem;
}

.bk-gradient-pill-blue-purple {
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-purple));
}

.bk-gradient-pill-teal-blue {
    background: linear-gradient(135deg, var(--brand-teal), var(--brand-blue));
}

.bk-gradient-pill-purple-teal {
    background: linear-gradient(135deg, var(--brand-purple), var(--brand-teal));
}

.bk-feature-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin: .5rem 0;
    color: var(--text);
}

.bk-feature-text {
    color: var(--text-soft);
}

.bk-order-1 {
    order: 1;
}

.bk-order-2 {
    order: 2;
}