:root {
    --ac-primary: #16181D;
    --ac-surface: #F3F5F9;
    --ac-card-bg: #FFFFFF;
    --ac-accent: #3B82F6;
    --ac-accent-light: #EFF6FF;
    --ac-muted: #8E97A6;
    --ac-text-main: #111827;
    --ac-text-muted: #4B5563;
    --ac-border: rgba(22, 24, 29, 0.12);
    --ac-shadow: 0 4px 20px rgba(22, 24, 29, 0.06);
    --ac-shadow-lg: 0 12px 32px rgba(22, 24, 29, 0.14);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 14px;
    --font-heading: 'Space Grotesk', -apple-system, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, monospace;
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
    position: relative;
}

body {
    font-family: var(--font-body);
    background-color: var(--ac-surface);
    color: var(--ac-text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Themed Browser Surfaces (Craft Floor §2) */
::selection {
    background: rgba(59, 130, 246, 0.30);
    color: var(--ac-primary);
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--ac-surface);
}

::-webkit-scrollbar-thumb {
    background: #CBD2DF;
    border-radius: 9999px;
    border: 2px solid var(--ac-surface);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ac-accent);
}

:focus-visible {
    outline: 2px solid var(--ac-accent);
    outline-offset: 2px;
}

input, select, textarea {
    caret-color: var(--ac-accent);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center { text-align: center; }
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Announcement Bar */
.announcement-bar {
    background-color: #000000;
    color: #FFFFFF;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding: 7px 16px;
    text-align: center;
}
.announcement-content {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Site Header */
.site-header {
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--ac-border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}
.header-left {
    display: flex;
    align-items: center;
    flex: 1;
}
.desktop-nav {
    display: flex;
    align-items: center;
    gap: 14px;
}
.desktop-nav .nav-pill {
    background: #000000;
    color: #FFFFFF !important;
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 12.5px;
    font-weight: 700;
    text-decoration: none;
}
.desktop-nav .nav-link {
    color: #18181B;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 3px;
    transition: color 0.2s;
}
.desktop-nav .nav-link:hover {
    color: var(--ac-accent);
}
.nav-arrow {
    font-size: 10px;
    opacity: 0.6;
}

.header-center {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}
.brand-logo {
    display: inline-flex;
    text-decoration: none;
}
.brand-logo-svg {
    display: block;
    height: 38px;
    width: auto;
}

.header-right {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 16px;
    flex: 1;
}
.header-details-link {
    font-size: 12.5px;
    font-weight: 700;
    color: #18181B;
    text-decoration: none;
    transition: color 0.2s;
}
.header-details-link:hover {
    color: var(--ac-accent);
}
.currency-picker select {
    background: transparent;
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    color: var(--ac-text-main);
}
.cart-trigger-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    position: relative;
    padding: 8px;
    display: flex;
    align-items: center;
}
.cart-count {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--ac-accent);
    color: white;
    font-size: 10px;
    font-weight: 700;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Hero Section */
.hero-pdp {
    padding: 40px 0;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: 48px;
    align-items: start;
    min-width: 0;
}

/* Gallery Column */
.gallery-column {
    position: sticky;
    top: 90px;
    min-width: 0;
    max-width: 100%;
}
.details-column {
    min-width: 0;
    max-width: 100%;
}
.main-stage {
    background: #FFFFFF;
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    position: relative;
    box-shadow: var(--ac-shadow);
    min-height: 440px;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 100%;
    overflow: hidden;
}
.media-visual {
    width: 100%;
    max-width: 100%;
    min-width: 0;
}
.badge-overlay {
    position: absolute;
    top: 16px;
    left: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    z-index: 2;
}
.badge {
    display: inline-block;
    padding: 4px 10px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
}
.tech-pill {
    background: var(--ac-primary);
    color: #FFFFFF;
}
.rating-pill {
    background: #EFF6FF;
    color: var(--ac-accent);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Product Photo Stage */
.product-photo-stage {
    position: relative;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.hero-product-img {
    width: 100%;
    max-width: 440px;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: 0 16px 40px rgba(22, 24, 29, 0.14);
    transition: transform 0.3s ease;
}
.hero-product-img:hover {
    transform: scale(1.02);
}
.concept-provenance-tag {
    font-size: 9px;
    color: var(--ac-text-muted);
    letter-spacing: 0.05em;
    margin-top: 10px;
    opacity: 0.7;
}

/* Tank Rendering Illustration Art */
.tank-render-stage {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 20px 0;
}
.tank-chassis {
    width: 190px;
    height: 280px;
    background: #1B1E24;
    border-radius: 20px 20px 8px 8px;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.25);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
}
.tank-neckline {
    width: 90px;
    height: 35px;
    background: #FFFFFF;
    border-radius: 0 0 45px 45px;
}
.tank-chest-zone {
    margin-top: 15px;
    width: 150px;
    height: 60px;
    background: rgba(59, 130, 246, 0.2);
    border: 1.5px dashed var(--ac-accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.zone-label {
    font-size: 9px;
    font-weight: 700;
    color: #93C5FD;
    letter-spacing: 0.05em;
}
.tank-core-ribs {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 20px;
    width: 140px;
}
.rib-line {
    height: 3px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
}
.tank-hem-grip {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 20px;
    background: rgba(59, 130, 246, 0.3);
    border-top: 2px solid var(--ac-accent);
    display: flex;
    align-items: center;
    justify-content: center;
}
.grip-label {
    font-size: 8px;
    font-weight: 700;
    color: #BFDBFE;
    letter-spacing: 0.08em;
}

.thumbnail-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 14px;
}
.thumb-btn {
    background: #FFFFFF;
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-sm);
    padding: 10px 4px;
    font-size: 11px;
    font-weight: 600;
    color: var(--ac-text-muted);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
}
.thumb-btn span {
    display: block;
    font-size: 9px;
    color: var(--ac-accent);
    margin-bottom: 2px;
}
.thumb-btn.active, .thumb-btn:hover {
    border-color: var(--ac-primary);
    color: var(--ac-primary);
    background: #F1F5F9;
}

/* Details Column */
.breadcrumbs {
    font-size: 12px;
    color: var(--ac-text-muted);
    margin-bottom: 12px;
}
.pdp-title {
    font-family: var(--font-heading);
    font-size: 34px;
    line-height: 1.2;
    color: var(--ac-primary);
    margin-bottom: 12px;
}
.pdp-tagline {
    font-size: 15px;
    color: var(--ac-text-muted);
    line-height: 1.5;
    margin-bottom: 16px;
}

.review-summary-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    margin-bottom: 20px;
}
.stars { color: #E5A13B; letter-spacing: 2px; }
.review-score { font-weight: 700; }
.review-link { color: var(--ac-text-muted); text-decoration: underline; }

/* Option Groups */
.option-group {
    margin-bottom: 18px;
}
.section-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--ac-primary);
    margin-bottom: 8px;
    text-transform: uppercase;
}
.color-swatches {
    display: flex;
    gap: 10px;
}
.color-swatch {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.2s;
}
.color-swatch:hover { transform: scale(1.1); }
.color-swatch.active {
    border-color: var(--ac-accent);
    box-shadow: 0 0 0 2px #FFFFFF, 0 0 0 4px var(--ac-accent);
}

.size-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.size-guide-link {
    background: none;
    border: none;
    font-size: 12px;
    color: var(--ac-accent);
    text-decoration: underline;
    cursor: pointer;
    font-weight: 600;
}
.size-pills {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
}
.size-pill {
    background: #FFFFFF;
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-sm);
    padding: 8px 4px;
    font-size: 12px;
    font-weight: 600;
    color: var(--ac-text-main);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
    min-height: 44px;
}
.size-pill:hover { border-color: var(--ac-primary); }
.size-pill.active {
    background: var(--ac-primary);
    color: #FFFFFF;
    border-color: var(--ac-primary);
}

/* Bundle Selector */
.bundle-selector {
    margin-bottom: 24px;
}
.tier-card {
    background: #FFFFFF;
    border: 1.5px solid var(--ac-border);
    border-radius: var(--radius-md);
    margin-bottom: 10px;
    position: relative;
    cursor: pointer;
    transition: all 0.2s;
}
.tier-card input[type="radio"] { display: none; }
.tier-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    cursor: pointer;
    width: 100%;
}
.tier-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--ac-primary);
}
.tier-desc {
    font-size: 12px;
    color: var(--ac-text-muted);
    margin-top: 2px;
}
.tier-perk {
    font-size: 11px;
    font-weight: 600;
    color: var(--ac-accent);
    margin-top: 4px;
}
.tier-pricing {
    text-align: right;
    min-width: 80px;
}
.current-price {
    font-size: 18px;
    font-weight: 700;
    color: var(--ac-primary);
}
.compare-price {
    font-size: 13px;
    color: var(--ac-text-muted);
    text-decoration: line-through;
}

.tier-card:hover { border-color: var(--ac-accent); }
.tier-card.selected {
    border-color: var(--ac-primary);
    background-color: #F8FAFC;
    box-shadow: 0 0 0 1px var(--ac-primary);
}

.ribbon-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: var(--ac-accent);
    color: #FFFFFF;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 10px;
    letter-spacing: 0.05em;
}
.best-ribbon { background: var(--ac-primary); }

/* Purchase Actions */
.purchase-action-box {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}
.quantity-wrapper {
    display: flex;
    align-items: center;
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-md);
    background: #FFFFFF;
    overflow: hidden;
    height: 52px;
}
.qty-btn {
    width: 44px;
    height: 100%;
    border: none;
    background: transparent;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    color: var(--ac-text-main);
}
.quantity-wrapper input {
    width: 40px;
    border: none;
    text-align: center;
    font-size: 15px;
    font-weight: 700;
    background: transparent;
}

.btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    border: none;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s var(--ease-out-expo), background-color 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
    min-height: 48px;
    padding: 10px 24px;
}
.btn:active {
    transform: scale(0.97);
    transition: transform 0.05s ease;
}
.btn-primary {
    background: var(--ac-primary);
    color: #FFFFFF;
    flex: 1;
    box-shadow: 0 4px 14px rgba(22, 24, 29, 0.2);
}
.btn-primary:hover {
    background: #2D313A;
    transform: translateY(-1px);
}
.btn-secondary {
    background: #FFFFFF;
    color: var(--ac-primary);
    border: 1px solid var(--ac-border);
}
.btn-text { font-size: 16px; font-weight: 700; }
.btn-subtext { font-size: 11px; opacity: 0.85; margin-top: 2px; }
.btn-sm { min-height: 38px; padding: 6px 14px; font-size: 13px; }
.btn-block { width: 100%; }

/* Inventory Status & Trust */
.inventory-status {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--ac-text-muted);
    margin-bottom: 20px;
    min-width: 0;
}
.pulse-dot {
    width: 8px;
    height: 8px;
    background: #3B82F6;
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(59, 130, 246, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

.trust-pill-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    border-top: 1px solid var(--ac-border);
    padding-top: 18px;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--ac-text-main);
}
.trust-item svg { stroke: var(--ac-accent); }

/* 3. Metric Bar */
.metric-bar {
    background: #FFFFFF;
    border-top: 1px solid var(--ac-border);
    border-bottom: 1px solid var(--ac-border);
    padding: 32px 0;
}
.metric-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}
.metric-number {
    font-family: var(--font-heading);
    font-size: 38px;
    font-weight: 700;
    color: var(--ac-primary);
}
.metric-label {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 4px 0 2px;
}
.metric-sub {
    font-size: 12px;
    color: var(--ac-text-muted);
}

/* Common Section Headers */
.section-tag {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--ac-accent);
    margin-bottom: 8px;
    display: inline-block;
}
.section-title {
    font-family: var(--font-heading);
    font-size: 32px;
    color: var(--ac-primary);
    margin-bottom: 12px;
}
.section-sub {
    font-size: 15px;
    color: var(--ac-text-muted);
    max-width: 640px;
    margin: 0 auto 36px;
}

/* 4. Comparison Section */
.comparison-section {
    padding: 64px 0;
}
.comparison-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 960px;
    margin: 0 auto;
}
.comp-col {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    border: 1px solid var(--ac-border);
    padding: 32px;
    box-shadow: var(--ac-shadow);
}
.comp-col.new-way {
    border: 2px solid var(--ac-primary);
    background: #F8FAFD;
}
.comp-col-header {
    margin-bottom: 24px;
    border-bottom: 1px solid var(--ac-border);
    padding-bottom: 16px;
}
.comp-col-header h3 {
    font-family: var(--font-heading);
    font-size: 20px;
    color: var(--ac-primary);
    margin-top: 8px;
}
.bad-badge { background: #FED7D7; color: #9B2C2C; }
.good-badge { background: #DBEAFE; color: #1E40AF; }

.comp-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
    font-size: 14px;
}
.comp-list li { display: flex; align-items: flex-start; gap: 12px; }
.comp-list .icon {
    font-weight: 700;
    font-size: 14px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.comp-list .cross { background: #FED7D7; color: #C53030; }
.comp-list .check { background: #DBEAFE; color: var(--ac-accent); }

/* 6. Zones Section */
.zones-section {
    padding: 64px 0;
    background: #FFFFFF;
    border-top: 1px solid var(--ac-border);
    border-bottom: 1px solid var(--ac-border);
}
.zones-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.zone-card {
    background: var(--ac-surface);
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: transform 0.2s;
}
.zone-card:hover { transform: translateY(-2px); border-color: var(--ac-accent); }
.zone-num {
    font-size: 10px;
    font-weight: 700;
    color: var(--ac-accent);
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}
.zone-card h3 {
    font-family: var(--font-heading);
    font-size: 17px;
    color: var(--ac-primary);
    margin-bottom: 10px;
}
.zone-card p {
    font-size: 13px;
    color: var(--ac-text-muted);
    line-height: 1.6;
}

/* 7. Reviews Section */
.reviews-section {
    padding: 64px 0;
}
.ugc-card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.ugc-card {
    background: #FFFFFF;
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--ac-shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.ugc-rating { color: #E5A13B; margin-bottom: 8px; }
.ugc-title {
    font-family: var(--font-heading);
    font-size: 16px;
    color: var(--ac-primary);
    margin-bottom: 10px;
}
.ugc-body {
    font-size: 13px;
    color: var(--ac-text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
}
.ugc-author {
    font-size: 12px;
    border-top: 1px solid var(--ac-border);
    padding-top: 10px;
    display: flex;
    justify-content: space-between;
}
.author-name { font-weight: 700; color: var(--ac-primary); }
.verified-badge { color: var(--ac-accent); }

/* 9. FAQ Section */
.faq-section {
    padding: 64px 0;
    background: #FFFFFF;
    border-top: 1px solid var(--ac-border);
}
.faq-container { max-width: 800px; }
.accordion { display: flex; flex-direction: column; gap: 12px; }
.accordion-item {
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.accordion-header {
    width: 100%;
    text-align: left;
    background: #FFFFFF;
    border: none;
    padding: 18px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--ac-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 52px;
}
.accordion-header:hover { background: var(--ac-surface); }
.acc-icon { font-size: 20px; color: var(--ac-accent); }
.accordion-content {
    display: none;
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--ac-text-muted);
    line-height: 1.6;
}
.accordion-item.active .accordion-content { display: block; }
.accordion-item.active .acc-icon { transform: rotate(45deg); }

/* 10. Guarantee Section */
.guarantee-section {
    padding: 48px 0;
}
.guarantee-box {
    background: #FFFFFF;
    border: 2px dashed rgba(59, 130, 246, 0.4);
    border-radius: var(--radius-lg);
    padding: 32px 40px;
    display: flex;
    align-items: center;
    gap: 32px;
    max-width: 880px;
    margin: 0 auto;
}
.guarantee-content h3 {
    font-family: var(--font-heading);
    font-size: 20px;
    color: var(--ac-primary);
    margin-bottom: 8px;
}
.guarantee-content p {
    font-size: 13px;
    color: var(--ac-text-muted);
    line-height: 1.6;
}

/* Footer */
.site-footer {
    background: #0E1014;
    color: #F3F5F9;
    padding: 64px 0 32px;
    font-size: 13px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 40px;
    margin-bottom: 48px;
}
.brand-col .brand-title { color: #FFFFFF; margin-bottom: 12px; }
.brand-col p { opacity: 0.7; font-size: 12px; line-height: 1.6; margin-bottom: 16px; }
.legal-disclaimer {
    font-size: 11px;
    opacity: 0.5;
    line-height: 1.5;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 12px;
}
.footer-col h4 {
    font-size: 14px;
    margin-bottom: 16px;
    letter-spacing: 0.05em;
    color: #FFFFFF;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: rgba(255, 255, 255, 0.7); text-decoration: none; transition: color 0.2s; }
.footer-col a:hover { color: #FFFFFF; }
.payment-badges { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.pay-chip {
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
}
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    opacity: 0.5;
    font-size: 11px;
}

/* Sticky ATC Bar */
.sticky-atc-bar {
    position: fixed;
    bottom: -80px;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border-top: 1px solid var(--ac-border);
    padding: 12px 0;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.08);
    transition: bottom 0.3s ease;
    z-index: 90;
}
.sticky-atc-bar.visible { bottom: 0; }
.sticky-atc-inner { display: flex; justify-content: space-between; align-items: center; }
.sticky-info { display: flex; flex-direction: column; }
.sticky-title { font-family: var(--font-heading); font-size: 15px; font-weight: 700; color: var(--ac-primary); }
.sticky-tier { font-size: 12px; color: var(--ac-text-muted); }
.sticky-action { display: flex; align-items: center; gap: 16px; }
.sticky-price { font-size: 18px; font-weight: 700; color: var(--ac-primary); }

/* Cart Drawer */
.cart-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}
.cart-drawer-overlay.open { opacity: 1; visibility: visible; }
.cart-drawer {
    position: fixed;
    top: 0;
    right: -420px;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background: #FFFFFF;
    z-index: 210;
    box-shadow: var(--ac-shadow-lg);
    display: flex;
    flex-direction: column;
    transition: right 0.3s ease;
}
.cart-drawer.open { right: 0; }
.cart-drawer-header {
    padding: 20px;
    border-bottom: 1px solid var(--ac-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.cart-drawer-header h3 { font-family: var(--font-heading); font-size: 18px; color: var(--ac-primary); }
.close-drawer-btn { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--ac-text-muted); }

.shipping-meter-wrap {
    background: #EFF6FF;
    padding: 12px 20px;
    border-bottom: 1px solid var(--ac-border);
}
.meter-text { font-size: 12px; font-weight: 600; color: var(--ac-primary); margin-bottom: 6px; }
.meter-bar { height: 6px; background: rgba(0, 0, 0, 0.08); border-radius: 3px; overflow: hidden; }
.meter-progress { height: 100%; background: var(--ac-accent); transition: width 0.3s; }

.cart-drawer-items { flex: 1; overflow-y: auto; padding: 20px; }
.empty-cart-state { text-align: center; padding: 48px 0; color: var(--ac-text-muted); }
.empty-cart-state p { margin-bottom: 16px; font-size: 14px; }

.cart-item-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    padding-bottom: 16px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--ac-border);
}
.item-title { font-weight: 700; font-size: 14px; color: var(--ac-primary); }
.item-tier-name { font-size: 12px; color: var(--ac-text-muted); margin-top: 2px; }
.item-price { font-weight: 700; font-size: 14px; color: var(--ac-primary); }
.item-actions { display: flex; align-items: center; gap: 8px; margin-top: 8px; }
.remove-btn { font-size: 11px; color: #C53030; background: none; border: none; cursor: pointer; }

.cart-drawer-footer {
    padding: 20px;
    border-top: 1px solid var(--ac-border);
    background: var(--ac-surface);
}
.cart-subtotal-row {
    display: flex;
    justify-content: space-between;
    font-size: 16px;
    font-weight: 700;
    color: var(--ac-primary);
    margin-bottom: 8px;
}
.shipping-note { font-size: 11px; color: var(--ac-text-muted); margin-bottom: 16px; line-height: 1.4; }

/* Checkout Modal */
.checkout-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
}
.checkout-modal-overlay.open { opacity: 1; visibility: visible; }
.checkout-modal-content {
    background: #FFFFFF;
    width: 100%;
    max-width: 520px;
    border-radius: var(--radius-lg);
    box-shadow: var(--ac-shadow-lg);
    overflow: hidden;
}
.modal-header {
    padding: 16px 24px;
    background: var(--ac-primary);
    color: #FFFFFF;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h3 { font-family: var(--font-heading); font-size: 16px; }
.close-modal-btn { background: none; border: none; color: #FFFFFF; font-size: 24px; cursor: pointer; }
.modal-body { padding: 24px; }
.order-summary-box {
    background: var(--ac-surface);
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 20px;
}
.summary-total-line {
    display: flex;
    justify-content: space-between;
    font-size: 15px;
    border-top: 1px solid var(--ac-border);
    padding-top: 10px;
    margin-top: 10px;
}
form input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--ac-border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    margin-bottom: 10px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.radio-card {
    border: 1px solid var(--ac-accent);
    background: #EFF6FF;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    margin-bottom: 16px;
}
.order-success-box { text-align: center; padding: 24px 0; }
.success-icon {
    width: 48px;
    height: 48px;
    background: #3B82F6;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 16px;
}

/* Button-in-Button CTA Architecture & Tactile Feedback */
.btn {
    transition: transform 0.15s var(--ease-out-expo), background-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:active {
    transform: scale(0.97) !important;
    transition: transform 0.05s ease !important;
}
.btn-pill-nested {
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    border-radius: 9999px;
    padding: 12px 14px 12px 24px;
    box-shadow: 0 4px 14px rgba(22, 24, 29, 0.2);
}
.btn-copy-col {
    display: flex;
    flex-direction: column;
    text-align: left;
    line-height: 1.25;
}
.btn-icon-bubble {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 0.2s var(--ease-out-spring), background-color 0.2s ease;
}
.btn-pill-nested:hover .btn-icon-bubble {
    transform: translateX(3px);
    background: rgba(255, 255, 255, 0.25);
}
.btn-icon-bubble-sm {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.16);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: 8px;
    font-size: 13px;
    transition: transform 0.2s var(--ease-out-spring);
}
.btn-pill-nested:hover .btn-icon-bubble-sm {
    transform: translateX(2px);
}

/* Double-Bezel Card Architecture (Doppelrand) */
.tier-card, .zone-card, .ugc-card, .matrix-feature-card {
    position: relative;
    background: #FFFFFF;
    border: 1px solid var(--ac-border);
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(22, 24, 29, 0.04), 0 6px 18px rgba(22, 24, 29, 0.04);
    transition: transform 0.22s var(--ease-out-expo), box-shadow 0.22s var(--ease-out-expo), border-color 0.22s ease;
}
.tier-card:hover, .zone-card:hover, .ugc-card:hover {
    box-shadow: 0 4px 12px rgba(22, 24, 29, 0.08), 0 12px 28px rgba(22, 24, 29, 0.06);
}
.tier-card.selected {
    border-color: var(--ac-primary);
    background: #FFFFFF;
    box-shadow: 0 0 0 1px var(--ac-primary), 0 8px 24px rgba(22, 24, 29, 0.08);
}

/* Mobile Navigation Hamburger & Off-Canvas Drawer */
.mobile-nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    z-index: 105;
}
.mobile-nav-toggle .hamburger-bar {
    width: 22px;
    height: 2px;
    background-color: var(--ac-primary);
    border-radius: 2px;
    transition: transform 0.25s var(--ease-out-expo), opacity 0.2s ease;
}
.mobile-nav-toggle.open .hamburger-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.mobile-nav-toggle.open .hamburger-bar:nth-child(2) {
    opacity: 0;
}
.mobile-nav-toggle.open .hamburger-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(22, 24, 29, 0.65);
    backdrop-filter: blur(4px);
    z-index: 250;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease-out-expo), visibility 0.3s ease;
}
.mobile-nav-overlay.open {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-drawer {
    position: fixed;
    top: 0;
    left: -320px;
    width: 82%;
    max-width: 320px;
    height: 100vh;
    background: #FFFFFF;
    color: var(--ac-text-main);
    z-index: 260;
    box-shadow: 0 0 32px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    transition: transform 0.32s var(--ease-out-expo);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}
.mobile-nav-drawer.open {
    transform: translateX(320px);
}

.mobile-nav-header {
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--ac-border);
}
.close-mobile-nav-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--ac-primary);
}
.mobile-nav-body {
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    flex: 1;
}
.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.mobile-nav-link {
    font-size: 16px;
    font-weight: 600;
    color: var(--ac-primary);
    text-decoration: none;
    padding: 12px 14px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.15s ease;
    min-height: 48px;
}
.mobile-nav-link:hover, .mobile-nav-link.active {
    background: var(--ac-surface);
    color: var(--ac-accent);
}
.mobile-nav-controls {
    border-top: 1px solid var(--ac-border);
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.control-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    color: var(--ac-text-muted);
    margin-bottom: 6px;
    display: block;
}
.mobile-select {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--ac-border);
    background: var(--ac-surface);
    font-size: 14px;
    font-weight: 600;
    color: var(--ac-primary);
}
.mobile-action-pill {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--ac-primary);
    color: #FFFFFF;
    text-decoration: none;
    padding: 14px 18px;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 14px;
    transition: transform 0.15s ease;
}
.mobile-action-pill:active {
    transform: scale(0.97);
}
.mobile-nav-footer {
    margin-top: auto;
    border-top: 1px solid var(--ac-border);
    padding-top: 16px;
}
.mobile-trust-badge {
    font-size: 11.5px;
    color: var(--ac-text-muted);
    line-height: 1.4;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Mobile Responsiveness & 4-Breakpoint Hardening */
@media (max-width: 900px) {
    body {
        padding-bottom: 84px;
    }
    .mobile-nav-toggle {
        display: flex;
    }
    .desktop-nav {
        display: none !important;
    }
    .currency-picker, .header-details-link {
        display: none !important;
    }
    .header-container {
        padding: 10px 16px;
        gap: 12px;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .header-left {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .brand-logo-svg {
        height: 30px;
    }
    .header-right {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .cart-trigger-btn {
        min-width: 44px;
        min-height: 44px;
        padding: 8px 12px;
    }
    .thumbnail-strip {
        display: flex;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 8px;
        padding-bottom: 6px;
    }
    .thumb-btn {
        flex: 0 0 auto;
        min-width: 100px;
        min-height: 44px;
    }
    .hero-grid { grid-template-columns: 1fr; gap: 28px; }
    .gallery-column { position: static; }
    .metric-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .comparison-table { grid-template-columns: 1fr; }
    .zones-grid { grid-template-columns: 1fr; }
    .ugc-card-grid { grid-template-columns: 1fr; }
    .guarantee-box { flex-direction: column; text-align: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .trust-pill-grid { grid-template-columns: 1fr; gap: 8px; }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .metric-grid {
        grid-template-columns: 1fr;
    }
    .purchase-action-box {
        flex-direction: column;
    }
    .quantity-wrapper {
        width: 100%;
        justify-content: center;
    }
    .btn-pill-nested {
        width: 100%;
    }
}