/* === PROJONMO PUBLICATIONS — BUSINESS BOOKS V2 === */
/* Premium Publisher & Editorial Ecommerce Design System */

@font-face {
    font-family: 'Hind Siliguri';
    font-weight: 400;
    src: url('../shared/assets/fonts/HindSiliguri-Regular.woff2') format('woff2');
    font-display: swap;
}
@font-face {
    font-family: 'Hind Siliguri';
    font-weight: 600;
    src: url('../shared/assets/fonts/HindSiliguri-Bold.woff2') format('woff2');
    font-display: swap;
}
@font-face {
    font-family: 'Hind Siliguri';
    font-weight: 700;
    src: url('../shared/assets/fonts/HindSiliguri-Bold.woff2') format('woff2');
    font-display: swap;
}

:root {
    /* Executive Palette */
    --bg-dark: #0e1116;
    --bg-dark-surface: #151921;
    --bg-dark-card: #1c222c;
    --bg-light: #f9f8f6;
    --bg-light-surface: #ffffff;
    --bg-light-alt: #f1efe9;
    
    --text-on-dark: #f4f4f5;
    --text-on-dark-muted: #9ba1ad;
    --text-on-light: #181a1d;
    --text-on-light-muted: #646a73;
    
    --brass: #c5a059;
    --brass-light: #dfb76c;
    --brass-dark: #9e7d3b;
    --brass-glow: rgba(197, 160, 89, 0.25);
    
    --green: #10b981;
    --green-dark: #059669;
    --red: #ef4444;
    
    --border-dark: rgba(255, 255, 255, 0.08);
    --border-light: rgba(0, 0, 0, 0.08);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.2);
    --shadow-book: 0 12px 28px rgba(0, 0, 0, 0.45), 0 4px 10px rgba(0, 0, 0, 0.25);
    --shadow-book-primary: 0 20px 48px rgba(0, 0, 0, 0.7), 0 0 24px rgba(197, 160, 89, 0.25);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Hind Siliguri', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-on-light);
    line-height: 1.65;
    font-size: 16px;
    overflow-x: hidden;
    padding-bottom: 74px;
}

.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-narrow {
    max-width: 720px;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.01em;
}

.kicker {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--brass);
    margin-bottom: 10px;
}

.sec-title {
    font-size: clamp(24px, 4.5vw, 34px);
    margin-bottom: 12px;
}

.sec-sub {
    font-size: 16px;
    line-height: 1.6;
    max-width: 680px;
}

/* === EXECUTIVE HEADER === */
.pub-header {
    background: #090b0e;
    border-bottom: 1px solid var(--border-dark);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(10px);
}

.pub-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-col {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-size: 18px;
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
}

.brand-tagline {
    font-size: 11px;
    color: var(--brass);
    font-weight: 600;
}

.header-action-btn {
    background: transparent;
    border: 1px solid var(--brass);
    color: var(--brass-light);
    font-family: inherit;
    font-size: 13px;
    font-weight: 700;
    padding: 7px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.header-action-btn:hover {
    background: var(--brass);
    color: #090b0e;
}

/* === HERO SECTION (Deep Navy / Charcoal) === */
.hero-sec {
    background: radial-gradient(circle at 50% 20%, #171d26 0%, #0e1116 100%);
    color: var(--text-on-dark);
    padding: 44px 0 50px;
    border-bottom: 1px solid var(--border-dark);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 36px;
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(26px, 5vw, 38px);
    color: #ffffff;
    margin-bottom: 14px;
}

.hero-content h1 em {
    font-style: normal;
    color: var(--brass-light);
    display: block;
}

.hero-desc {
    font-size: clamp(14px, 2vw, 16px);
    color: var(--text-on-dark-muted);
    margin-bottom: 24px;
    line-height: 1.6;
}

/* Hero Price Bar */
.hero-price-panel {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(197, 160, 89, 0.35);
    border-radius: 12px;
    padding: 18px 20px;
    margin-bottom: 20px;
}

.hpp-top {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 6px;
}

.hpp-old {
    font-size: 15px;
    color: #888e99;
    text-decoration: line-through;
}

.hpp-curr {
    font-size: clamp(32px, 5.5vw, 40px);
    font-weight: 800;
    color: #ffffff;
    line-height: 1;
}

.hpp-curr sup {
    font-size: 20px;
    color: var(--brass-light);
    font-weight: 600;
    top: -0.3em;
}

.hpp-save {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
    font-size: 12px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
}

.btn-hero-order {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, var(--brass-light), var(--brass));
    color: #0e1116;
    font-family: inherit;
    font-size: 17px;
    font-weight: 800;
    padding: 15px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-align: center;
    box-shadow: 0 6px 24px var(--brass-glow);
    transition: transform 0.2s, filter 0.2s;
}

.btn-hero-order:hover {
    transform: translateY(-2px);
    filter: brightness(1.06);
}

.hero-reassurance-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-on-dark-muted);
}

.hero-reassurance-list span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.hero-reassurance-list span::before {
    content: "✓";
    color: var(--brass);
    font-weight: 800;
}

/* === 10-BOOK HERO COMPOSITION (Big Primary + 9 Grid) === */
.hero-book-stage {
    position: relative;
    padding: 6px 0;
}

.hero-10books-layout {
    display: grid;
    grid-template-columns: 1.1fr 1.6fr;
    gap: 12px;
    align-items: center;
}

/* Interactive Semantic Button */
.hero-book-btn {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    position: relative;
    display: block;
    width: 100%;
    border-radius: 6px;
    transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1), box-shadow 0.2s ease;
    outline: none;
}

.hero-book-btn img {
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1.45;
    object-fit: cover;
    display: block;
    border-radius: 5px;
    box-shadow: var(--shadow-book);
}

.hero-book-btn:focus-visible {
    box-shadow: 0 0 0 3px var(--brass-light), var(--shadow-book);
}

.hero-book-btn:hover {
    transform: translateY(-4px) scale(1.04);
    z-index: 10;
}

/* Big Dominant Cover: সফল উদ্যোক্তা */
.hero-feature-book {
    position: relative;
    z-index: 3;
}

.hero-feature-book img {
    box-shadow: var(--shadow-book-primary);
    border: 1px solid rgba(197, 160, 89, 0.45);
}

.hero-feature-book:hover {
    transform: translateY(-6px) scale(1.03);
}

/* 9 Surrounding Books Grid */
.hero-grid-9books {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.hero-grid-9books .hero-book-btn img {
    border: 1px solid rgba(255, 255, 255, 0.08);
}

/* === TRUST / RETAILER STRIP (Warm Off-White) === */
.trust-strip-sec {
    background: var(--bg-light-alt);
    border-bottom: 1px solid var(--border-light);
    padding: 24px 0 20px;
    text-align: center;
}

.trust-strip-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 28px;
    margin-bottom: 18px;
    padding-bottom: 16px;
    border-bottom: 1px dashed var(--border-light);
    flex-wrap: wrap;
}

.ts-stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.ts-stat-num {
    font-size: 22px;
    font-weight: 800;
    color: var(--brass-dark);
    line-height: 1.1;
}

.ts-stat-lbl {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-on-light-muted);
}

.ts-stat-divider {
    width: 1px;
    height: 28px;
    background: var(--border-light);
}

.trust-strip-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-on-light-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.retailers-flex {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.retailer-logo {
    height: 24px;
    max-width: 95px;
    object-fit: contain;
    filter: grayscale(100%) opacity(0.75);
    transition: filter 0.2s;
}

.retailer-logo:hover {
    filter: grayscale(0%) opacity(1);
}

/* === SECTION BASE STYLING === */
.content-sec {
    padding: 52px 0;
    scroll-margin-top: 50px;
}

.content-sec.alt-bg {
    background: var(--bg-light-alt);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

.content-sec.dark-bg {
    background: var(--bg-dark);
    color: var(--text-on-dark);
    border-top: 1px solid var(--border-dark);
    border-bottom: 1px solid var(--border-dark);
}

.sec-header {
    margin-bottom: 32px;
}

.sec-header.centered {
    text-align: center;
}

.sec-header.centered .sec-sub {
    margin: 0 auto;
}

/* === 5 STRATEGIC PILLARS === */
.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

.pillar-card {
    background: var(--bg-light-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 22px;
    border-left: 3px solid var(--brass);
    box-shadow: var(--shadow-sm);
}

.pillar-num {
    font-size: 12px;
    font-weight: 800;
    color: var(--brass-dark);
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.pillar-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-on-light);
    margin-bottom: 8px;
}

.pillar-desc {
    font-size: 14px;
    color: var(--text-on-light-muted);
    line-height: 1.5;
    margin-bottom: 12px;
}

.pillar-books {
    font-size: 13px;
    font-weight: 600;
    color: var(--brass-dark);
    border-top: 1px dashed var(--border-light);
    padding-top: 8px;
}

/* === 10-BOOK EDITORIAL LIBRARY === */
.library-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.lib-book-item {
    background: var(--bg-light-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    gap: 16px;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.2, 0, 0, 1);
    scroll-margin-top: 80px;
}

/* Temporary highlight animation when jumped from Hero */
.lib-book-item.highlighted {
    border-color: var(--brass);
    background: #fdfbf7;
    box-shadow: 0 0 0 3px var(--brass-glow), var(--shadow-md);
    transform: translateY(-4px);
}

.lib-book-cover {
    width: 80px;
    flex-shrink: 0;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: var(--shadow-book);
}

.lib-book-cover img {
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1.45;
    object-fit: cover;
    display: block;
}

.lib-book-meta {
    flex: 1;
}

.lib-book-num {
    font-size: 11px;
    font-weight: 700;
    color: var(--brass-dark);
    margin-bottom: 2px;
}

.lib-book-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-on-light);
    line-height: 1.3;
    margin-bottom: 4px;
}

.lib-book-takeaway {
    font-size: 13px;
    color: var(--text-on-light-muted);
    line-height: 1.4;
}

/* === WHY THIS BUNDLE EXISTS === */
.narrative-block {
    max-width: 720px;
    margin: 0 auto;
}

.narrative-p {
    font-size: 17px;
    line-height: 1.7;
    margin-bottom: 20px;
    color: #c9ccd4;
}

.narrative-quote {
    border-left: 3px solid var(--brass);
    padding-left: 20px;
    margin: 28px 0;
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    line-height: 1.5;
}

/* === PRICING / VALUE SECTION === */
.pricing-card {
    background: var(--bg-light-surface);
    border: 1px solid var(--brass);
    border-radius: 12px;
    padding: 36px 32px;
    max-width: 640px;
    margin: 0 auto;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.pc-kicker {
    font-size: 13px;
    font-weight: 700;
    color: var(--brass-dark);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.pc-title {
    font-size: 24px;
    margin-bottom: 20px;
}

.pc-figures {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.pc-old {
    font-size: 20px;
    color: var(--text-on-light-muted);
    text-decoration: line-through;
}

.pc-current {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-on-light);
    line-height: 1;
}

.pc-current sup {
    font-size: 24px;
    color: var(--brass-dark);
}

.pc-badge {
    display: inline-block;
    background: rgba(16, 185, 129, 0.12);
    color: var(--green-dark);
    font-size: 13px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 24px;
}

.pc-list {
    text-align: left;
    max-width: 440px;
    margin: 0 auto 28px;
    font-size: 15px;
}

.pc-list-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    border-bottom: 1px dashed var(--border-light);
}

.pc-list-item:last-child {
    border-bottom: none;
}

.pc-list-item::before {
    content: "✓";
    color: var(--green-dark);
    font-weight: 800;
}

/* === REAL FACEBOOK REVIEWS GRID === */
.fb-reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.fb-review-btn {
    background: var(--bg-light-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    display: block;
    width: 100%;
    text-align: left;
    outline: none;
}

.fb-review-btn:hover {
    transform: translateY(-3px);
    border-color: var(--brass);
    box-shadow: var(--shadow-md);
}

.fb-review-btn:focus-visible {
    box-shadow: 0 0 0 3px var(--brass-light);
}

.fb-review-btn img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

/* === ACCESSIBLE LIGHTBOX MODAL === */
.lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.lightbox-modal.active,
.lightbox-modal:not([hidden]) {
    display: flex;
}

.lightbox-modal[hidden] {
    display: none !important;
}

.lightbox-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(9, 11, 14, 0.85);
    backdrop-filter: blur(8px);
}

.lightbox-dialog {
    position: relative;
    z-index: 1001;
    max-width: 760px;
    max-height: 90vh;
    background: #161a22;
    border: 1px solid rgba(197, 160, 89, 0.5);
    border-radius: 12px;
    overflow: auto;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.8);
    padding: 16px;
}

.lightbox-close-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid var(--border-dark);
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1002;
    transition: background 0.2s;
}

.lightbox-close-btn:hover {
    background: var(--brass-dark);
}

.lightbox-img-wrap img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 6px;
}

/* === PUBLISHER AUTHORITY (2,20,000+ Book Sales) === */
.authority-grid-2col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.auth-stat-card {
    background: var(--bg-light-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 24px 16px;
    box-shadow: var(--shadow-sm);
}

.auth-num {
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 800;
    color: var(--brass-dark);
    line-height: 1.1;
    margin-bottom: 6px;
}

.auth-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-on-light-muted);
}

/* === FAQ SECTION === */
.faq-list {
    max-width: 680px;
    margin: 0 auto;
}

.faq-card {
    background: var(--bg-light-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: 10px;
    overflow: hidden;
}

.faq-btn {
    width: 100%;
    background: none;
    border: none;
    padding: 16px 20px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-on-light);
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-btn::after {
    content: "+";
    font-size: 18px;
    color: var(--brass-dark);
}

.faq-card.open .faq-btn::after {
    content: "−";
}

.faq-answer {
    display: none;
    padding: 0 20px 16px;
    font-size: 14px;
    color: var(--text-on-light-muted);
    line-height: 1.5;
}

.faq-card.open .faq-answer {
    display: block;
}

/* === ORDER FORM SECTION === */
.order-sec {
    background: #0e1116;
    color: var(--text-on-dark);
    padding: 60px 0;
    scroll-margin-top: 50px;
}

.checkout-card {
    background: #161a22;
    border: 1px solid rgba(197, 160, 89, 0.4);
    border-radius: 12px;
    padding: 32px;
    max-width: 580px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.cc-header {
    text-align: center;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-dark);
    padding-bottom: 16px;
}

.cc-title {
    font-size: 22px;
    color: #ffffff;
    margin-bottom: 4px;
}

.cc-sub {
    font-size: 14px;
    color: var(--text-on-dark-muted);
}

.form-field {
    margin-bottom: 18px;
}

.form-field label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-on-dark);
    margin-bottom: 6px;
}

.form-field input,
.form-field textarea {
    width: 100%;
    background: #0e1116;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    padding: 14px 16px;
    color: #ffffff;
    font-family: inherit;
    font-size: 15px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-field input:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--brass-light);
    box-shadow: 0 0 0 3px var(--brass-glow);
}

.form-field textarea {
    resize: vertical;
    min-height: 80px;
}

.field-context-notice {
    font-size: 12px;
    color: var(--brass-light);
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.field-error-msg {
    font-size: 13px;
    font-weight: 600;
    color: #f87171;
    margin-top: 6px;
}

.form-field input.input-error,
.form-field textarea.input-error {
    border-color: #ef4444 !important;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.25) !important;
}

/* Order Summary Box */
.checkout-summary {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-dark);
    border-radius: 8px;
    padding: 16px;
    margin: 20px 0;
}

.cs-row {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--text-on-dark-muted);
    margin-bottom: 6px;
}

.cs-row.total {
    border-top: 1px solid var(--border-dark);
    padding-top: 10px;
    margin-top: 8px;
    font-size: 18px;
    font-weight: 700;
    color: #ffffff;
}

.cs-row.total span:last-child {
    color: var(--brass-light);
    font-size: 22px;
}

.btn-confirm-order {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, var(--brass-light), var(--brass));
    color: #0e1116;
    font-family: inherit;
    font-size: 18px;
    font-weight: 800;
    padding: 16px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, filter 0.2s;
}

.btn-confirm-order:hover {
    transform: translateY(-2px);
    filter: brightness(1.06);
}

.btn-confirm-order:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.checkout-reassurance {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 12px;
    color: var(--text-on-dark-muted);
    margin-top: 14px;
}

.form-status-alert {
    padding: 12px;
    border-radius: 6px;
    font-size: 14px;
    margin-top: 14px;
    text-align: center;
    display: none;
}

.form-status-alert.error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--red);
    color: #fca5a5;
}

.form-status-alert.success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--green);
    color: #6ee7b7;
}

/* === FOOTER === */
.pub-footer {
    background: #090b0e;
    color: #6c727d;
    font-size: 13px;
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border-dark);
}

/* === MOBILE STICKY CTA BAR === */
.mobile-sticky-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(14, 17, 22, 0.96);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(197, 160, 89, 0.4);
    padding: 10px 16px;
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.ms-info .ms-price {
    font-size: 19px;
    font-weight: 800;
    color: var(--brass-light);
    line-height: 1.1;
}

.ms-info .ms-sub {
    font-size: 11px;
    color: var(--text-on-dark-muted);
}

.ms-btn {
    background: linear-gradient(135deg, var(--brass-light), var(--brass));
    color: #0e1116;
    font-family: inherit;
    font-size: 14px;
    font-weight: 800;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

/* === RESPONSIVE BREAKPOINTS === */
@media (max-width: 768px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .hero-book-stage {
        order: -1;
    }
    .hero-quad-composition {
        grid-template-columns: 1.25fr 1fr;
        gap: 12px;
    }
    .library-grid, .fb-reviews-grid {
        grid-template-columns: 1fr;
    }
    .authority-grid-2col {
        grid-template-columns: 1fr;
        max-width: 320px;
    }
    .checkout-card {
        padding: 24px 16px;
    }
}

@media (min-width: 769px) {
    .mobile-sticky-bar {
        display: none;
    }
    body {
        padding-bottom: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}