/* ============================================
   Kingjoy Forge - Collection Page Styles
   ============================================ */

/* ---- Main Collection Hero ---- */
.coll-hero {
    background: linear-gradient(135deg, #1A1A2E 0%, #2C3E50 100%);
    padding: 6rem 0 5rem;
    text-align: center;
    color: #fff;
}

.coll-hero h1 {
    font-size: var(--font-size-5xl, 4.8rem);
    font-weight: 800;
    margin: 1rem 0;
    line-height: 1.2;
}

.coll-hero-tag {
    display: inline-block;
    font-size: var(--font-size-sm, 1.4rem);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    font-weight: 600;
}

.coll-hero-sub {
    font-size: var(--font-size-lg, 1.8rem);
    color: rgba(255,255,255,0.8);
    max-width: 60rem;
    margin: 0 auto;
}

/* ---- Breadcrumb ---- */
.coll-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--font-size-sm, 1.4rem);
    margin-bottom: 2rem;
    opacity: 0.7;
}

.coll-breadcrumb a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.coll-breadcrumb a:hover {
    color: var(--color-accent);
}

.coll-breadcrumb span {
    opacity: 0.6;
}

/* ---- Collection Cards (Main Page) ---- */
.coll-cards {
    padding: var(--space-20, 8rem) 0;
}

.coll-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.coll-card {
    display: block;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: inherit;
}

.coll-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 36px rgba(0,0,0,0.15);
}

.coll-card-img {
    aspect-ratio: 4/3;
    overflow: hidden;
}

.coll-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.coll-card:hover .coll-card-img img {
    transform: scale(1.05);
}

.coll-card-body {
    padding: 2.5rem;
}

.coll-card-body h2 {
    font-size: var(--font-size-2xl, 2.4rem);
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 1rem;
}

.coll-card-body p {
    font-size: var(--font-size-base, 1.6rem);
    color: var(--color-ink-muted);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.coll-card-link {
    font-size: var(--font-size-sm, 1.4rem);
    font-weight: 600;
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

.coll-card:hover .coll-card-link {
    color: var(--color-accent-hover);
}

/* ---- Sub Collection Hero ---- */
.coll-sub-hero {
    position: relative;
    width: 100%;
    height: 50vh;
    min-height: 360px;
    max-height: 500px;
    overflow: hidden;
}

.coll-sub-hero-bg {
    position: absolute;
    inset: 0;
}

.coll-sub-hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.coll-sub-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0.7) 100%);
}

.coll-sub-hero-content {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: var(--container-max, 1200px);
    margin: 0 auto;
    padding: 0 2rem;
    color: #fff;
}

.coll-sub-hero-content .coll-breadcrumb {
    color: rgba(255,255,255,0.9);
    margin-bottom: 1rem;
}

.coll-sub-hero-content h1 {
    font-size: var(--font-size-5xl, 4.8rem);
    font-weight: 800;
    line-height: 1.2;
    margin: 0.5rem 0;
}

.coll-sub-hero-content p {
    font-size: var(--font-size-xl, 2rem);
    color: rgba(255,255,255,0.85);
    max-width: 50rem;
}

/* ---- Section Layout ---- */
.coll-section {
    padding: var(--space-20, 8rem) 0;
}

.coll-section-gray {
    background: var(--color-gray-50, #F8F9FA);
}

.coll-section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.coll-section-header .section-tag {
    display: inline-block;
    font-size: var(--font-size-sm, 1.4rem);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.coll-section-header h2 {
    font-size: var(--font-size-4xl, 3.6rem);
    font-weight: 700;
    color: var(--color-ink);
    line-height: 1.3;
}

.coll-section-header h3 {
    font-size: var(--font-size-2xl, 2.4rem);
    font-weight: 700;
    color: var(--color-ink);
}

.coll-section-sub {
    font-size: var(--font-size-lg, 1.8rem);
    color: var(--color-ink-muted);
    margin-top: 1rem;
}

/* ---- Intro Text ---- */
.coll-intro-text {
    max-width: 80rem;
    margin: 0 auto;
}

.coll-intro-text p {
    font-size: var(--font-size-lg, 1.8rem);
    color: var(--color-ink-muted);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

/* ---- Material Comparison ---- */
.coll-material-compare {
    max-width: 100rem;
    margin: 0 auto;
}

.coll-material-intro {
    font-size: var(--font-size-lg, 1.8rem);
    color: var(--color-ink-muted);
    text-align: center;
    margin-bottom: 3rem;
    line-height: 1.6;
}

.coll-material-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}

.coll-material-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.coll-material-card img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
}

.coll-material-card h3 {
    font-size: var(--font-size-xl, 2rem);
    font-weight: 700;
    color: var(--color-ink);
    padding: 2rem 2rem 0.5rem;
}

.coll-material-card p {
    font-size: var(--font-size-base, 1.6rem);
    color: var(--color-ink-muted);
    line-height: 1.7;
    padding: 0 2rem 2rem;
}

/* ---- Features Grid ---- */
.coll-features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.coll-feature-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    text-align: center;
    padding: 2.5rem;
}

.coll-feature-card img {
    width: 100%;
    max-height: 240px;
    object-fit: contain;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.coll-feature-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.coll-feature-card h3 {
    font-size: var(--font-size-xl, 2rem);
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 1rem;
}

.coll-feature-card p {
    font-size: var(--font-size-base, 1.6rem);
    color: var(--color-ink-muted);
    line-height: 1.7;
}

/* ---- Tech Diagram ---- */
.coll-tech-diagram {
    text-align: center;
    margin-bottom: 3rem;
}

.coll-tech-diagram img {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.coll-tech-intro {
    max-width: 80rem;
    margin: 0 auto 3rem;
}

.coll-tech-intro p {
    font-size: var(--font-size-lg, 1.8rem);
    color: var(--color-ink-muted);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

/* ---- Product Series Blocks ---- */
.coll-series-block {
    margin-bottom: 4rem;
}

.coll-series-block:last-child {
    margin-bottom: 0;
}

.coll-series-header {
    display: grid;
    grid-template-columns: 40% 1fr;
    gap: 3rem;
    align-items: start;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.coll-series-header > img {
    width: 100%;
    height: 100%;
    min-height: 280px;
    object-fit: cover;
}

.coll-series-imgs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
}

.coll-series-imgs img {
    width: 100%;
    height: 100%;
    min-height: 200px;
    object-fit: cover;
}

.coll-series-info {
    padding: 3rem;
}

.coll-series-info h3 {
    font-size: var(--font-size-2xl, 2.4rem);
    font-weight: 700;
    color: var(--color-ink);
    margin-bottom: 1rem;
}

.coll-series-info > p {
    font-size: var(--font-size-base, 1.6rem);
    color: var(--color-ink-muted);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.coll-series-models {
    font-size: var(--font-size-base, 1.6rem);
    color: var(--color-ink-light);
    margin-bottom: 1.5rem;
}

.coll-series-cta {
    font-size: var(--font-size-lg, 1.8rem);
    font-weight: 600;
    color: var(--color-accent);
    margin-top: 1rem;
}

.coll-material-options span {
    display: block;
    font-size: var(--font-size-sm, 1.4rem);
    font-weight: 600;
    color: var(--color-ink);
    margin-top: 0.5rem;
    margin-bottom: 0.3rem;
}

.coll-material-options ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 0.5rem;
}

.coll-material-options li {
    font-size: var(--font-size-sm, 1.4rem);
    padding: 0.3rem 1rem;
    background: var(--color-gray-100, #F0F2F5);
    border-radius: 20px;
    color: var(--color-ink-muted);
}

/* ---- Accessories Grid ---- */
.coll-acc-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2.5rem;
}

.coll-acc-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.coll-acc-grid-small {
    margin-top: 3rem;
}

.coll-acc-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.coll-acc-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.coll-acc-imgs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
}

.coll-acc-imgs img {
    width: 100%;
    aspect-ratio: 1/1;
    object-fit: cover;
}

.coll-acc-card > img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
}

.coll-acc-card h3 {
    font-size: var(--font-size-lg, 1.8rem);
    font-weight: 700;
    color: var(--color-ink);
    padding: 1.5rem 1.5rem 0.5rem;
}

.coll-acc-card p {
    font-size: var(--font-size-sm, 1.4rem);
    color: var(--color-ink-muted);
    line-height: 1.6;
    padding: 0 1.5rem 1.5rem;
}

.coll-extra-header {
    margin-top: 5rem;
}

/* ---- Tips Grid ---- */
.coll-tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.coll-tip-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.coll-tip-card img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
}

.coll-tip-card h3 {
    font-size: var(--font-size-lg, 1.8rem);
    font-weight: 700;
    color: var(--color-ink);
    padding: 2rem 2rem 1rem;
}

.coll-tip-card p {
    font-size: var(--font-size-base, 1.6rem);
    color: var(--color-ink-muted);
    line-height: 1.7;
    padding: 0 2rem;
    margin-bottom: 1rem;
}

.coll-tip-card p:last-child {
    padding-bottom: 2rem;
}

/* ---- CTA Section ---- */
.coll-cta {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    padding: 6rem 0;
    text-align: center;
    color: #fff;
}

.coll-cta h2 {
    font-size: var(--font-size-4xl, 3.6rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.coll-cta p {
    font-size: var(--font-size-lg, 1.8rem);
    color: rgba(255,255,255,0.9);
    margin-bottom: 2rem;
}

.coll-cta .btn-primary {
    display: inline-block;
    padding: 1.2rem 3.5rem;
    background: #fff;
    color: var(--color-accent);
    font-size: var(--font-size-lg, 1.8rem);
    font-weight: 700;
    text-decoration: none;
    border-radius: 50px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.coll-cta .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .coll-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .coll-acc-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .coll-acc-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .coll-features-grid {
        gap: 2rem;
    }

    .coll-series-header {
        grid-template-columns: 45% 1fr;
    }
}

@media (max-width: 768px) {
    .coll-hero {
        padding: 4rem 0 3rem;
    }

    .coll-hero h1 {
        font-size: 3.2rem;
    }

    .coll-hero-sub {
        font-size: 1.6rem;
    }

    .coll-cards-grid {
        grid-template-columns: 1fr;
    }

    .coll-section {
        padding: 4rem 0;
    }

    .coll-section-header h2 {
        font-size: 2.8rem;
    }

    .coll-sub-hero-content h1 {
        font-size: 3rem;
    }

    .coll-sub-hero-content p {
        font-size: 1.6rem;
    }

    .coll-material-grid {
        grid-template-columns: 1fr;
    }

    .coll-features-grid {
        grid-template-columns: 1fr;
    }

    .coll-series-header {
        grid-template-columns: 1fr;
    }

    .coll-series-header > img,
    .coll-series-imgs img {
        min-height: 200px;
    }

    .coll-series-info {
        padding: 2rem;
    }

    .coll-acc-grid,
    .coll-acc-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .coll-tips-grid {
        grid-template-columns: 1fr;
    }

    .coll-cta h2 {
        font-size: 2.4rem;
    }

    .coll-cta .btn-primary {
        padding: 1rem 2.5rem;
        font-size: 1.6rem;
    }
}

@media (max-width: 480px) {
    .coll-acc-grid,
    .coll-acc-grid-3 {
        grid-template-columns: 1fr;
    }

    .coll-acc-imgs {
        grid-template-columns: 1fr 1fr;
    }
}