/* ============================================================
   QUESTION BANK – PREMIUM UI REDESIGN
   Covers: question-banks.php, question-bank-preview.php,
           question-bank-cart.php, question-bank-checkout.php
   ============================================================ */

/* ── CSS Custom Properties ─────────────────────────────────── */
:root {
    --qb-green-50:  #f0fdf4;
    --qb-green-100: #dcfce7;
    --qb-green-200: #bbf7d0;
    --qb-green-500: #22c55e;
    --qb-green-600: #16a34a;
    --qb-green-700: #15803d;
    --qb-green-800: #166534;
    --qb-green-900: #14532d;
    --qb-teal-600:  #0d9488;
    --qb-teal-700:  #0f766e;
    --qb-teal-900:  #134e4a;
    --qb-dark:      #0f172a;
    --qb-dark-800:  #1e293b;
    --qb-dark-700:  #334155;
    --qb-dark-500:  #64748b;
    --qb-dark-300:  #cbd5e1;
    --qb-dark-100:  #f1f5f9;
    --qb-red:       #ef4444;
    --qb-amber:     #f59e0b;
    --qb-white:     #ffffff;

    --qb-radius-sm:  10px;
    --qb-radius:     16px;
    --qb-radius-lg:  24px;
    --qb-radius-xl:  32px;
    --qb-shadow-sm:  0 2px 8px rgba(15,23,42,.07);
    --qb-shadow:     0 8px 24px rgba(15,23,42,.1);
    --qb-shadow-lg:  0 24px 48px rgba(15,23,42,.14);
    --qb-transition: 0.25s cubic-bezier(.4,0,.2,1);
}

/* ── Page body tint ─────────────────────────────────────────── */
body {
    background: #eef7f2;
}

/* ╔══════════════════════════════════════════════════════════════
   ║  SHARED – HERO BAND
   ╚══════════════════════════════════════════════════════════════ */
.qb-hero {
    position: relative;
    overflow: hidden;
    padding: 72px 24px 56px;
    background: linear-gradient(135deg, #064e3b 0%, #065f46 40%, #0f766e 100%);
}

/* Decorative blobs */
.qb-hero::before,
.qb-hero::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}
.qb-hero::before {
    width: 520px;
    height: 520px;
    background: radial-gradient(circle, rgba(16,185,129,.22) 0%, transparent 70%);
    top: -180px;
    right: -120px;
}
.qb-hero::after {
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(5,150,105,.18) 0%, transparent 70%);
    bottom: -120px;
    left: 10%;
}

.qb-hero-inner {
    position: relative;
    z-index: 2;
    max-width: 1160px;
    margin: 0 auto;
}

/* back link */
.qb-back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,.75);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 22px;
    letter-spacing: .02em;
    transition: color var(--qb-transition);
}
.qb-back-link:hover { color: #fff; }
.qb-back-link i { font-size: 12px; }

/* kicker pill */
.qb-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,.12);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,.18);
    color: #6ee7b7;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
    padding: 7px 16px;
    border-radius: 999px;
    margin-bottom: 20px;
}

.qb-hero h1 {
    font-size: clamp(28px, 4.5vw, 52px);
    font-weight: 900;
    color: #fff;
    line-height: 1.12;
    max-width: 820px;
    margin-bottom: 14px;
    letter-spacing: -.02em;
}

.qb-hero p {
    font-size: 16px;
    line-height: 1.75;
    color: rgba(255,255,255,.78);
    max-width: 620px;
    margin-bottom: 30px;
}

/* hero row – heading + cart button */
.qb-hero-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

/* cart button in hero */
.qb-cart-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255,255,255,.14);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,.25);
    color: #fff;
    text-decoration: none;
    padding: 14px 22px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 14px;
    white-space: nowrap;
    transition: background var(--qb-transition), transform var(--qb-transition);
    flex-shrink: 0;
    align-self: flex-start;
    margin-top: 4px;
}
.qb-cart-btn:hover {
    background: rgba(255,255,255,.22);
    transform: translateY(-2px);
}
.qb-cart-badge {
    min-width: 26px;
    height: 26px;
    padding: 0 8px;
    border-radius: 999px;
    background: #10b981;
    color: #fff;
    font-size: 12px;
    font-weight: 900;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ╔══════════════════════════════════════════════════════════════
   ║  SHARED – BODY SECTION WRAPPER
   ╚══════════════════════════════════════════════════════════════ */
.qb-section {
    padding: 36px 24px 80px;
    background: #eef7f2;
}

.qb-shell {
    max-width: 1160px;
    margin: 0 auto;
}

/* ╔══════════════════════════════════════════════════════════════
   ║  PAGE 1 – QUESTION BANKS LISTING
   ╚══════════════════════════════════════════════════════════════ */

/* ── Filter bar ─────────────────────────────────────────────── */
.qb-filter-bar {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 12px;
    margin-bottom: 36px;
    background: #fff;
    border-radius: var(--qb-radius-lg);
    padding: 16px;
    box-shadow: var(--qb-shadow-sm);
    border: 1px solid rgba(15,23,42,.06);
}

.qb-filter-search {
    position: relative;
}
.qb-filter-search i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--qb-dark-500);
    font-size: 14px;
    pointer-events: none;
}
.qb-filter-search input {
    width: 100%;
    padding: 13px 16px 13px 44px;
    border: 1.5px solid #e2e8f0;
    border-radius: var(--qb-radius-sm);
    font-family: inherit;
    font-size: 14px;
    color: var(--qb-dark);
    background: var(--qb-dark-100);
    transition: border-color var(--qb-transition), box-shadow var(--qb-transition);
    outline: none;
}
.qb-filter-search input:focus {
    border-color: var(--qb-teal-600);
    box-shadow: 0 0 0 3px rgba(13,148,136,.12);
    background: #fff;
}
.qb-filter-select {
    padding: 13px 16px;
    border: 1.5px solid #e2e8f0;
    border-radius: var(--qb-radius-sm);
    font-family: inherit;
    font-size: 14px;
    color: var(--qb-dark);
    background: var(--qb-dark-100);
    cursor: pointer;
    outline: none;
    min-width: 130px;
    transition: border-color var(--qb-transition);
}
.qb-filter-select:focus { border-color: var(--qb-teal-600); }
.qb-filter-btn {
    padding: 13px 28px;
    background: linear-gradient(135deg, var(--qb-teal-700) 0%, var(--qb-green-700) 100%);
    color: #fff;
    border: none;
    border-radius: var(--qb-radius-sm);
    font-family: inherit;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    letter-spacing: .03em;
    transition: opacity var(--qb-transition), transform var(--qb-transition);
}
.qb-filter-btn:hover { opacity: .9; transform: translateY(-1px); }

/* ── Card grid ──────────────────────────────────────────────── */
.qb-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
}

/* ── Individual card ────────────────────────────────────────── */
.qb-card {
    background: #fff;
    border-radius: var(--qb-radius-lg);
    overflow: hidden;
    border: 1px solid rgba(15,23,42,.07);
    box-shadow: var(--qb-shadow-sm);
    display: flex;
    flex-direction: column;
    transition: transform var(--qb-transition), box-shadow var(--qb-transition);
}
.qb-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--qb-shadow-lg);
}

/* cover image area */
.qb-card-cover {
    position: relative;
    display: block;
    text-decoration: none;
    overflow: hidden;
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}
.qb-card-cover img {
    width: 100%;
    height: 270px;
    object-fit: cover;
    display: block;
    transition: transform .4s ease;
}
.qb-card:hover .qb-card-cover img { transform: scale(1.04); }
.qb-card-cover-fallback {
    height: 270px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--qb-teal-700);
    font-size: 64px;
}

/* released ribbon */
.qb-released-pill {
    position: absolute;
    top: 14px;
    left: 14px;
    background: linear-gradient(135deg, #ff3737, #c0000e);
    color: #fff;
    font-size: 11px;
    font-weight: 900;
    letter-spacing: .1em;
    text-transform: uppercase;
    padding: 6px 14px;
    border-radius: 999px;
    box-shadow: 0 4px 12px rgba(192,0,14,.35);
}

/* banners row at bottom of cover */
.qb-card-banners {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    display: grid;
    grid-template-columns: 1fr 1.4fr;
}
.qb-banner {
    padding: 9px 8px;
    font-size: 11px;
    font-weight: 900;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: #fff;
    text-align: center;
}
.qb-banner-avail { background: rgba(220,38,38,.88); }
.qb-banner-type  { background: rgba(5,150,105,.92); }

/* card body */
.qb-card-body {
    padding: 22px 22px 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.qb-card-year-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--qb-green-100);
    color: var(--qb-green-800);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .06em;
    padding: 5px 12px;
    border-radius: 999px;
    width: fit-content;
}

.qb-card-title {
    font-size: 17px;
    font-weight: 800;
    color: var(--qb-dark);
    line-height: 1.35;
    margin: 6px 0 4px;
}
.qb-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--qb-transition);
}
.qb-card-title a:hover { color: var(--qb-teal-700); }

.qb-card-desc {
    font-size: 13px;
    color: var(--qb-dark-500);
    line-height: 1.65;
    flex: 1;
}

.qb-card-submeta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--qb-dark-500);
}
.qb-card-submeta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.qb-card-submeta i { color: var(--qb-green-700); }

/* quantity row inside card */
.qb-qty-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid #f0f4f8;
}
.qb-qty-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--qb-dark-700);
}
.qb-qty-ctrl {
    display: inline-flex;
    align-items: center;
    background: var(--qb-dark-100);
    border: 1.5px solid #e2e8f0;
    border-radius: 999px;
    overflow: hidden;
}
.qb-qty-btn {
    width: 38px;
    height: 38px;
    border: none;
    background: transparent;
    color: var(--qb-dark-700);
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--qb-transition);
}
.qb-qty-btn:hover { background: var(--qb-green-100); color: var(--qb-green-700); }
.qb-qty-input {
    width: 52px;
    height: 38px;
    border: none;
    background: transparent;
    text-align: center;
    font-size: 14px;
    font-weight: 800;
    color: var(--qb-dark);
    outline: none;
    font-family: inherit;
}

/* card footer – price + actions */
.qb-card-footer {
    padding: 16px 22px 20px;
    border-top: 1px solid #f0f4f8;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
}
.qb-card-price {
    font-size: 22px;
    font-weight: 900;
    color: var(--qb-dark);
    letter-spacing: -.02em;
}
.qb-card-actions {
    display: flex;
    gap: 10px;
}

/* ── Shared button atoms ────────────────────────────────────── */
.qb-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 20px;
    border-radius: var(--qb-radius-sm);
    font-family: inherit;
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
    border: none;
    cursor: pointer;
    white-space: nowrap;
    letter-spacing: .02em;
    transition: all var(--qb-transition);
}
.qb-btn-primary {
    background: linear-gradient(135deg, var(--qb-green-700) 0%, var(--qb-teal-700) 100%);
    color: #fff;
    box-shadow: 0 4px 14px rgba(15,118,110,.28);
}
.qb-btn-primary:hover {
    background: linear-gradient(135deg, var(--qb-green-800) 0%, var(--qb-teal-700) 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(15,118,110,.35);
}
.qb-btn-ghost {
    background: var(--qb-dark-100);
    color: var(--qb-dark-800);
    border: 1.5px solid #e2e8f0;
}
.qb-btn-ghost:hover {
    background: var(--qb-green-50);
    border-color: var(--qb-green-200);
    color: var(--qb-green-700);
    transform: translateY(-1px);
}
.qb-btn-dark {
    background: var(--qb-dark);
    color: #fff;
}
.qb-btn-dark:hover { background: var(--qb-dark-800); transform: translateY(-1px); }
.qb-btn-danger {
    background: transparent;
    color: var(--qb-red);
    border: none;
    padding: 8px;
    font-size: 16px;
}
.qb-btn-danger:hover { color: #dc2626; transform: scale(1.1); }
.qb-btn-lg {
    padding: 15px 28px;
    font-size: 15px;
    border-radius: var(--qb-radius);
}
.qb-btn-full { width: 100%; }

/* empty state */
.qb-empty {
    text-align: center;
    padding: 80px 24px;
    background: #fff;
    border-radius: var(--qb-radius-lg);
    box-shadow: var(--qb-shadow-sm);
}
.qb-empty i {
    font-size: 58px;
    color: var(--qb-teal-700);
    margin-bottom: 16px;
    opacity: .55;
}
.qb-empty h2 {
    font-size: 24px;
    color: var(--qb-dark);
    margin-bottom: 10px;
}
.qb-empty p {
    font-size: 15px;
    color: var(--qb-dark-500);
    max-width: 460px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ╔══════════════════════════════════════════════════════════════
   ║  PAGE 2 – PREVIEW / PRODUCT PAGE
   ╚══════════════════════════════════════════════════════════════ */
.qb-product-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(340px, .9fr);
    gap: 48px;
    align-items: start;
    margin-bottom: 56px;
}

/* gallery panel */
.qb-gallery {
    display: grid;
    grid-template-columns: 90px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
    position: sticky;
    top: 80px;
}

.qb-thumbs {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.qb-thumb {
    border: 2px solid #e2e8f0;
    background: #fff;
    border-radius: var(--qb-radius-sm);
    overflow: hidden;
    padding: 0;
    cursor: pointer;
    transition: border-color var(--qb-transition), transform var(--qb-transition);
}
.qb-thumb:hover, .qb-thumb.active {
    border-color: var(--qb-teal-600);
    transform: translateY(-2px);
}
.qb-thumb img {
    width: 100%;
    height: 118px;
    object-fit: cover;
    display: block;
}

.qb-main-stage {
    position: relative;
    background: #fff;
    border-radius: var(--qb-radius-lg);
    border: 1.5px solid #e2e8f0;
    min-height: 680px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--qb-shadow);
}
.qb-main-stage img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.qb-stage-fallback {
    min-height: 680px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    color: var(--qb-teal-700);
    opacity: .35;
}
.qb-zoom-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,.95);
    color: var(--qb-dark);
    box-shadow: var(--qb-shadow);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--qb-transition), box-shadow var(--qb-transition);
}
.qb-zoom-btn:hover { transform: scale(1.1); box-shadow: var(--qb-shadow-lg); }

/* product info panel */
.qb-product-info {
    padding-top: 4px;
}

.qb-product-year {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--qb-green-100);
    color: var(--qb-green-800);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .07em;
    padding: 5px 14px;
    border-radius: 999px;
    margin-bottom: 14px;
}

.qb-product-title {
    font-size: clamp(24px, 3vw, 40px);
    font-weight: 900;
    color: var(--qb-dark);
    line-height: 1.15;
    margin-bottom: 14px;
    letter-spacing: -.02em;
}

.qb-product-rating {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--qb-dark-500);
}
.qb-stars { color: var(--qb-amber); font-size: 15px; letter-spacing: .06em; }
.qb-divider { color: #d1d5db; }

.qb-product-price {
    font-size: clamp(30px, 4vw, 46px);
    font-weight: 900;
    color: var(--qb-dark);
    letter-spacing: -.03em;
    padding-bottom: 22px;
    border-bottom: 1px solid #e9eef5;
    margin-bottom: 20px;
}

/* feature bullets */
.qb-feature-list {
    list-style: none;
    padding: 0;
    margin: 0 0 22px;
}
.qb-feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: var(--qb-dark-700);
    padding: 8px 0;
    border-bottom: 1px solid #f0f4f8;
}
.qb-feature-list li:last-child { border: none; }
.qb-feature-list li::before {
    content: '✓';
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--qb-green-100);
    color: var(--qb-green-700);
    font-size: 11px;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 1px;
}

/* buy box */
.qb-buy-box {
    background: var(--qb-dark-100);
    border: 1.5px solid #e2e8f0;
    border-radius: var(--qb-radius);
    padding: 18px;
    margin-bottom: 20px;
}
.qb-buy-box-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.qb-buy-box-label { font-size: 14px; color: var(--qb-dark-700); font-weight: 600; }
.qb-buy-box-name  { font-weight: 800; color: var(--qb-dark); font-size: 15px; }
.qb-buy-box-amount { font-weight: 800; color: var(--qb-green-800); font-size: 16px; }
.qb-buy-box-tag {
    background: var(--qb-green-100);
    color: var(--qb-green-800);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
}

/* quantity row on preview page */
.qb-qty-row-preview {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

/* action row */
.qb-action-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 22px;
}

/* side meta (SKU, category etc.) */
.qb-side-meta {
    border-top: 1px solid #e9eef5;
    padding-top: 18px;
    font-size: 13px;
    color: var(--qb-dark-500);
    line-height: 1.9;
}
.qb-side-meta strong { color: var(--qb-dark-700); }

/* description + preview grid below */
.qb-detail-section { margin-top: 8px; }

.qb-description-copy {
    font-size: 15px;
    color: var(--qb-dark-500);
    line-height: 1.85;
    margin-bottom: 32px;
    background: #fff;
    border-radius: var(--qb-radius);
    padding: 24px;
    box-shadow: var(--qb-shadow-sm);
    border: 1px solid rgba(15,23,42,.06);
}

.qb-preview-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}
.qb-preview-card {
    background: #fff;
    border-radius: var(--qb-radius);
    overflow: hidden;
    box-shadow: var(--qb-shadow-sm);
    border: 1px solid rgba(15,23,42,.06);
    transition: transform var(--qb-transition), box-shadow var(--qb-transition);
}
.qb-preview-card:hover { transform: translateY(-4px); box-shadow: var(--qb-shadow); }
.qb-preview-card img { width: 100%; display: block; }

/* ╔══════════════════════════════════════════════════════════════
   ║  PAGE 3 – CART
   ╚══════════════════════════════════════════════════════════════ */
.qb-cart-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.65fr) minmax(300px, .95fr);
    gap: 28px;
    align-items: start;
}

/* cart list panel */
.qb-panel {
    background: #fff;
    border-radius: var(--qb-radius-xl);
    padding: 30px;
    box-shadow: var(--qb-shadow-sm);
    border: 1px solid rgba(15,23,42,.06);
}

.qb-panel-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f4f8;
}
.qb-panel-heading h2 {
    font-size: 20px;
    font-weight: 800;
    color: var(--qb-dark);
}
.qb-clear-btn {
    background: transparent;
    border: none;
    color: var(--qb-red);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--qb-transition);
}
.qb-clear-btn:hover { color: #dc2626; }

/* cart item */
.qb-cart-item {
    display: grid;
    grid-template-columns: 100px minmax(0, 1fr);
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid #f0f4f8;
}
.qb-cart-item:last-child { border-bottom: none; padding-bottom: 0; }
.qb-cart-item:first-child { padding-top: 0; }

.qb-cart-img-wrap {
    border-radius: var(--qb-radius);
    overflow: hidden;
    background: var(--qb-green-50);
}
.qb-cart-img-wrap img { width: 100%; display: block; }
.qb-cart-img-fallback {
    width: 100%;
    aspect-ratio: .78;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--qb-teal-700);
    opacity: .6;
}

.qb-cart-details { display: flex; flex-direction: column; gap: 10px; }
.qb-cart-topline {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}
.qb-cart-name {
    font-size: 17px;
    font-weight: 800;
    color: var(--qb-dark);
    text-decoration: none;
    line-height: 1.3;
    transition: color var(--qb-transition);
}
.qb-cart-name:hover { color: var(--qb-teal-700); }
.qb-cart-meta-line {
    font-size: 13px;
    color: var(--qb-dark-500);
    margin-top: 3px;
}

.qb-cart-bottomline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.qb-cart-pricing { text-align: right; }
.qb-cart-pricing-each {
    font-size: 12px;
    color: var(--qb-dark-500);
}
.qb-cart-pricing-total {
    font-size: 19px;
    font-weight: 900;
    color: var(--qb-dark);
    letter-spacing: -.02em;
}

/* summary card */
.qb-summary-card {
    background: #fff;
    border-radius: var(--qb-radius-xl);
    padding: 28px;
    box-shadow: var(--qb-shadow-sm);
    border: 1px solid rgba(15,23,42,.06);
    position: sticky;
    top: 80px;
}
.qb-summary-card h3 {
    font-size: 18px;
    font-weight: 800;
    color: var(--qb-dark);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid #f0f4f8;
}
.qb-summary-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid #f8fafc;
    font-size: 14px;
    color: var(--qb-dark-500);
}
.qb-summary-row:first-of-type { padding-top: 0; }
.qb-summary-row strong { color: var(--qb-dark-700); font-weight: 700; }
.qb-summary-row.qb-total {
    border-top: 2px solid #e9eef5;
    border-bottom: none;
    margin-top: 6px;
    padding-top: 16px;
}
.qb-summary-row.qb-total span,
.qb-summary-row.qb-total strong {
    font-size: 17px;
    font-weight: 900;
    color: var(--qb-dark);
}
.qb-summary-actions {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.qb-continue-link {
    text-align: center;
    font-size: 13px;
    color: var(--qb-dark-500);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: color var(--qb-transition);
}
.qb-continue-link:hover { color: var(--qb-teal-700); }

/* empty state */
.qb-cart-empty {
    text-align: center;
    padding: 80px 24px;
    background: #fff;
    border-radius: var(--qb-radius-xl);
    box-shadow: var(--qb-shadow-sm);
    border: 1px solid rgba(15,23,42,.06);
}
.qb-cart-empty i {
    font-size: 12px;
    color: var(--qb-teal-700);
    opacity: .45;
    margin-bottom: 18px;
    display: block;
}
.qb-cart-empty h2 { font-size: 22px; color: var(--qb-dark); margin-bottom: 10px; }
.qb-cart-empty p {
    max-width: 440px;
    margin: 0 auto 24px;
    font-size: 14px;
    color: var(--qb-dark-500);
    line-height: 1.7;
}

/* ╔══════════════════════════════════════════════════════════════
   ║  PAGE 4 – CHECKOUT
   ╚══════════════════════════════════════════════════════════════ */
.qb-checkout-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(300px, .95fr);
    gap: 28px;
    align-items: start;
}

/* form group */
.qb-form-group {
    margin-bottom: 22px;
}
.qb-form-group label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--qb-dark-700);
    letter-spacing: .04em;
    margin-bottom: 8px;
    text-transform: uppercase;
}
.qb-form-group input,
.qb-form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid #e2e8f0;
    border-radius: var(--qb-radius-sm);
    font-family: inherit;
    font-size: 15px;
    color: var(--qb-dark);
    background: var(--qb-dark-100);
    transition: border-color var(--qb-transition), box-shadow var(--qb-transition), background var(--qb-transition);
    outline: none;
    resize: vertical;
}
.qb-form-group input:focus,
.qb-form-group textarea:focus {
    border-color: var(--qb-teal-600);
    box-shadow: 0 0 0 3px rgba(13,148,136,.12);
    background: #fff;
}
.qb-form-group input::placeholder,
.qb-form-group textarea::placeholder { color: #9ca3af; }

/* form heading chip */
.qb-form-heading {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f4f8;
}
.qb-form-heading-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--qb-radius-sm);
    background: linear-gradient(135deg, var(--qb-teal-700), var(--qb-green-700));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    flex-shrink: 0;
}
.qb-form-heading h2 {
    font-size: 19px;
    font-weight: 800;
    color: var(--qb-dark);
}

/* alert error */
.qb-alert-error {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: #fff1f2;
    border: 1.5px solid #fecdd3;
    border-radius: var(--qb-radius-sm);
    padding: 16px;
    margin-bottom: 22px;
    font-size: 14px;
    color: #be123c;
}
.qb-alert-error i { margin-top: 1px; flex-shrink: 0; }

/* checkout summary items list */
.qb-checkout-item {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid #f8fafc;
    font-size: 14px;
}
.qb-checkout-item:first-child { padding-top: 0; }
.qb-checkout-item-name { color: var(--qb-dark-700); flex: 1; line-height: 1.5; }
.qb-checkout-item-total { font-weight: 800; color: var(--qb-dark); white-space: nowrap; }

/* trust badges row */
.qb-trust-row {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid #f0f4f8;
    flex-wrap: wrap;
}
.qb-trust-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--qb-dark-500);
    font-weight: 600;
}
.qb-trust-badge i { color: var(--qb-green-700); }

/* ╔══════════════════════════════════════════════════════════════
   ║  RESPONSIVE
   ╚══════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
    .qb-grid { grid-template-columns: repeat(2, 1fr); }
    .qb-product-layout { grid-template-columns: 1fr; }
    .qb-gallery { position: static; }
}

@media (max-width: 768px) {
    .qb-hero { padding: 52px 18px 40px; }
    .qb-hero h1 { font-size: 28px; }
    .qb-hero p  { font-size: 14px; }
    .qb-hero-row { flex-direction: column; gap: 14px; }

    .qb-filter-bar {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .qb-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .qb-gallery {
        grid-template-columns: 1fr;
    }
    .qb-thumbs {
        order: 2;
        flex-direction: row;
        overflow-x: auto;
        gap: 10px;
    }
    .qb-thumb { min-width: 80px; flex-shrink: 0; }
    .qb-thumb img { height: 90px; }
    .qb-main-stage,
    .qb-stage-fallback { min-height: 360px; }

    .qb-action-row { grid-template-columns: 1fr; }
    .qb-preview-grid { grid-template-columns: 1fr; }

    .qb-cart-layout,
    .qb-checkout-layout {
        grid-template-columns: 1fr;
    }
    .qb-cart-item { grid-template-columns: 80px minmax(0,1fr); gap: 14px; }
    .qb-cart-bottomline { flex-direction: column; align-items: stretch; }
    .qb-cart-pricing { text-align: left; }

    .qb-summary-card { position: static; }

    .qb-section { padding: 24px 16px 60px; }
    .qb-panel { padding: 20px; }
    .qb-summary-card { padding: 20px; }
}

/* ╔══════════════════════════════════════════════════════════════
   ║  MODAL FOR IMAGES
   ╚══════════════════════════════════════════════════════════════ */
.qb-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.qb-modal.active {
    display: flex;
    opacity: 1;
}

.qb-modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--qb-radius-sm);
    box-shadow: var(--qb-shadow-lg);
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.qb-modal.active .qb-modal-content {
    transform: scale(1);
}

.qb-modal-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f5f9;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
    z-index: 10000;
}

.qb-modal-close:hover,
.qb-modal-close:focus {
    color: var(--qb-teal-500);
    text-decoration: none;
}

@media (max-width: 768px) {
    .qb-modal-content {
        max-width: 95%;
    }
    .qb-modal-close {
        top: 15px;
        right: 20px;
        font-size: 30px;
    }
}