/* ============================================================
   STUDIO ZEN E-BOOK LANDING - książkowy layout
   ============================================================ */
:root {
    --pearl: #FFFFFF;
    --paper: #F7F7F6;
    --paper-edge: #E5E5E3;
    --dark: #1C1B1A;
    --muted: #5C5650;
    --accent: #9C6644;
    --accent-light: #B8896A;
    --success: #3D6B4F;
    --danger: #9B4D4D;
    --shadow-book: 0 20px 60px rgba(28, 27, 26, 0.08), 0 2px 12px rgba(28, 27, 26, 0.04);
    --shadow-page: 0 1px 0 var(--paper-edge), 0 8px 28px rgba(28, 27, 26, 0.06);

    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'Poppins', system-ui, sans-serif;

    --page-width: min(100%, 52rem);
    --page-gutter: clamp(1.25rem, 4vw, 2.5rem);
    --section-y: clamp(3.5rem, 8vw, 6rem);
    --radius: 1rem;
    --radius-lg: 1.75rem;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-sans);
    font-weight: 300;
    font-size: clamp(0.9375rem, 0.4vw + 0.85rem, 1.0625rem);
    line-height: 1.7;
    color: var(--dark);
    background: #F0F0EF;
    min-height: 100vh;
    overflow-x: hidden;
    max-width: 100%;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, .font-serif {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.skip-link {
    position: absolute; left: -9999px; top: 0; z-index: 9999;
    padding: 0.75rem 1rem; background: var(--dark); color: var(--pearl);
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* -- Book shell -- */
.book-shell {
    max-width: 56rem;
    margin: 0 auto;
    padding: clamp(1rem, 3vw, 2rem) var(--page-gutter) 4rem;
}

.book-page {
    background: var(--pearl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-book);
    border: 1px solid var(--paper-edge);
    overflow: hidden;
    position: relative;
}

.book-page::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--accent);
}

.page-inner {
    padding: clamp(2rem, 5vw, 3.5rem) clamp(1.5rem, 4vw, 3rem);
}

.chapter-label {
    font-size: 0.6875rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
    display: block;
}

.chapter-title {
    font-size: clamp(1.75rem, 4vw + 0.5rem, 2.75rem);
    margin-bottom: 1.25rem;
}

.lead {
    font-size: clamp(1.05rem, 1vw + 0.9rem, 1.2rem);
    color: var(--muted);
    max-width: 38em;
}

.drop-cap::first-letter {
    float: left;
    font-family: var(--font-serif);
    font-size: 3.8em;
    line-height: 0.78;
    padding-right: 0.12em;
    color: var(--accent);
    font-weight: 400;
}

.page-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--paper-edge), transparent);
    margin: var(--section-y) 0;
}

/* -- Cover -- */
.cover {
    text-align: center;
    padding: clamp(3rem, 8vw, 5rem) clamp(1.5rem, 4vw, 3rem);
    background:
        var(--pearl);
}

.cover-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.6875rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent-light);
    padding: 0.45rem 1rem;
    border-radius: 999px;
    margin-bottom: 1.5rem;
}

.cover h1 {
    font-size: clamp(2rem, 6vw + 0.5rem, 3.5rem);
    max-width: 14ch;
    margin: 0 auto 1rem;
    line-height: 1.05;
}

.cover h1 em {
    font-style: italic;
    color: var(--accent);
}

.cover-sub {
    font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
    color: var(--muted);
    max-width: 32em;
    margin: 0 auto 2rem;
}

.cover-meta {
    font-size: 0.8125rem;
    color: var(--muted);
    letter-spacing: 0.06em;
}

.cover-cta {
    margin-top: 2.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

/* -- Buttons -- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    padding: 0.95rem 1.75rem;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
    text-decoration: none;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
    background: var(--dark);
    color: var(--pearl);
    box-shadow: 0 4px 20px rgba(28, 27, 26, 0.2);
}

.btn-primary:hover {
    background: #2a2928;
    box-shadow: 0 6px 28px rgba(28, 27, 26, 0.28);
}

.btn-accent {
    background: var(--accent);
    color: var(--pearl);
}

.btn-accent:hover { background: #8a5939; }

.btn-outline {
    background: transparent;
    color: var(--dark);
    border: 1px solid var(--paper-edge);
}

.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-lg {
    padding: 1.1rem 2.25rem;
    font-size: 0.9375rem;
}

/* -- Before / After -- */
.compare-grid {
    display: grid;
    gap: 1.25rem;
    margin-top: 2rem;
}

@media (min-width: 640px) {
    .compare-grid { grid-template-columns: 1fr 1fr; }
}

.compare-card {
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--paper-edge);
}

.compare-card--before {
    background: #F5F5F4;
    border-color: #DDDCDA;
}

.compare-card--after {
    background: #F2F6F3;
    border-color: #CDD9D2;
}

.compare-card h3 {
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.compare-card--before h3 { color: var(--danger); }
.compare-card--after h3 { color: var(--success); }

.compare-stat {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.compare-list {
    list-style: none;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.compare-list li {
    padding: 0.35rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.compare-list li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

/* -- Calculator -- */
.calc-section {
    background: var(--paper);
    border-radius: var(--radius-lg);
    border: 1px solid var(--paper-edge);
    padding: clamp(1.5rem, 4vw, 2.5rem);
    margin-top: 2rem;
}

.calc-grid {
    display: grid;
    gap: 2rem;
    margin-top: 1.5rem;
}

.calc-fields {
    display: grid;
    gap: 1.25rem;
}

.field label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 400;
    margin-bottom: 0.4rem;
    color: var(--muted);
}

.field input[type="number"],
.field input[type="text"],
.field input[type="email"] {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--paper-edge);
    border-radius: 0.65rem;
    background: var(--pearl);
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--dark);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.field input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(156, 102, 68, 0.12);
}

.field-hint {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 0.35rem;
}

/* Options checkboxes */
.options-block h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.options-block > p {
    font-size: 0.875rem;
    color: var(--muted);
    margin-bottom: 1rem;
}

.option-item {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
    padding: 0.9rem 1rem;
    border: 1px solid var(--paper-edge);
    border-radius: var(--radius);
    background: var(--pearl);
    margin-bottom: 0.65rem;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.option-item:hover { border-color: var(--accent-light); }

.option-item:has(input:checked) {
    border-color: var(--accent);
    background: #F7F7F6;
}

.option-item input {
    margin-top: 0.2rem;
    accent-color: var(--accent);
    width: 1.1rem;
    height: 1.1rem;
    flex-shrink: 0;
}

.option-body strong {
    display: block;
    font-weight: 400;
    font-size: 0.9375rem;
    margin-bottom: 0.15rem;
}

.option-body span {
    font-size: 0.8125rem;
    color: var(--muted);
}

.option-value {
    margin-left: auto;
    font-size: 0.8125rem;
    color: var(--success);
    white-space: nowrap;
    font-weight: 400;
}

/* Results panel */
.results-panel {
    background: var(--dark);
    color: var(--pearl);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    position: sticky;
    top: 1.5rem;
}

.results-panel h3 {
    font-size: 0.75rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-light);
    margin-bottom: 1.25rem;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.65rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    font-size: 0.9rem;
}

.result-row:last-of-type { border-bottom: none; }

.result-row .val {
    font-family: var(--font-serif);
    font-size: 1.35rem;
}

.result-row--highlight {
    margin-top: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.result-row--highlight .val {
    font-size: 2rem;
    color: #E8E6E3;
}

.result-row--potential .val { color: #8FD4A8; }

.blurred .val-sensitive {
    filter: blur(7px);
    opacity: 0.55;
    user-select: none;
}

.val-sensitive {
    position: relative;
    display: inline-block;
    min-width: 4ch;
}

.gate-hint {
    margin-top: 1.25rem;
    padding: 1rem;
    background: rgba(255,255,255,0.06);
    border-radius: var(--radius);
    font-size: 0.8125rem;
    color: rgba(255,255,255,0.75);
    text-align: center;
}

.results-panel .btn {
    width: 100%;
    margin-top: 1.25rem;
}

.results-panel.revealed .gate-hint { display: none; }

.interpretation {
    margin-top: 1.25rem;
    padding: 1rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    line-height: 1.6;
    display: none;
}

.results-panel.revealed .interpretation { display: block; }

.interpretation--alarm { background: rgba(155, 77, 77, 0.25); }
.interpretation--growth { background: rgba(255, 255, 255, 0.08); }
.interpretation--premium { background: rgba(61, 107, 79, 0.25); }

/* -- Testimonials -- */
.testimonial-grid {
    display: grid;
    gap: 1.25rem;
    margin-top: 2rem;
}

@media (min-width: 700px) {
    .testimonial-grid { grid-template-columns: repeat(3, 1fr); }
}

.testimonial {
    padding: 1.5rem;
    background: var(--paper);
    border-radius: var(--radius);
    border: 1px solid var(--paper-edge);
    font-size: 0.9rem;
}

.testimonial blockquote {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.5;
    margin-bottom: 1rem;
    font-style: italic;
}

.testimonial-result {
    font-size: 0.8125rem;
    color: var(--accent);
    font-weight: 400;
}

/* -- TOC / Contents -- */
.toc-list {
    list-style: none;
    margin-top: 1.5rem;
}

.toc-list li {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0.65rem 0;
    border-bottom: 1px dotted var(--paper-edge);
    font-size: 0.9375rem;
}

.toc-num {
    font-family: var(--font-serif);
    color: var(--accent);
    min-width: 2rem;
}

/* -- FAQ -- */
.faq-item {
    border-bottom: 1px solid var(--paper-edge);
}

.faq-item summary {
    padding: 1.1rem 0;
    cursor: pointer;
    font-weight: 400;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: '+';
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--accent);
    flex-shrink: 0;
}

.faq-item[open] summary::after { content: '−'; }

.faq-item p {
    padding-bottom: 1.1rem;
    color: var(--muted);
    font-size: 0.9375rem;
}

/* -- Author -- */
.author-block {
    display: grid;
    gap: 2rem;
    align-items: center;
    margin-top: 1.5rem;
}

@media (min-width: 640px) {
    .author-block { grid-template-columns: 200px 1fr; }
}

.author-photo {
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 3/4;
    background: var(--paper-edge);
}

.author-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* -- Modal -- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(28, 27, 26, 0.55);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.modal-overlay.is-open {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--pearl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-book);
    max-width: 28rem;
    width: 100%;
    padding: 2rem;
    transform: translateY(12px);
    transition: transform 0.3s;
}

.modal-overlay.is-open .modal { transform: translateY(0); }

.modal h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.modal > p {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--muted);
    line-height: 1;
}

.modal-form .field { margin-bottom: 1rem; }

.modal-form .checkbox-field {
    display: flex;
    gap: 0.65rem;
    align-items: flex-start;
    font-size: 0.8125rem;
    color: var(--muted);
    margin-bottom: 1.25rem;
}

.modal-form .checkbox-field input { margin-top: 0.2rem; accent-color: var(--accent); }

.form-feedback {
    font-size: 0.8125rem;
    margin-top: 0.75rem;
    display: none;
}

.form-feedback.is-visible { display: block; }
.form-feedback--success { color: var(--success); }
.form-feedback--error { color: var(--danger); }

/* -- Bonus cards -- */
.bonus-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

@media (min-width: 600px) {
    .bonus-grid { grid-template-columns: repeat(2, 1fr); }
}

.bonus-card {
    padding: 1.25rem;
    border: 1px solid var(--paper-edge);
    border-radius: var(--radius);
    background: var(--paper);
}

.bonus-card strong {
    display: block;
    font-family: var(--font-serif);
    font-size: 1.15rem;
    margin-bottom: 0.35rem;
}

.bonus-card span { font-size: 0.85rem; color: var(--muted); }

/* -- Sticky nav -- */
.book-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--paper-edge);
    padding: 0.75rem var(--page-gutter);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.nav-links {
    display: none;
    gap: 1.25rem;
    font-size: 0.8125rem;
    letter-spacing: 0.04em;
}

.nav-links a:hover { color: var(--accent); }

/* -- Footer -- */
.book-footer {
    text-align: center;
    padding: 2rem var(--page-gutter);
    font-size: 0.8125rem;
    color: var(--muted);
}

.book-footer a { color: var(--accent); }

/* -- Reveal animation -- */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.reveal {
    animation: fadeUp 0.6s ease forwards;
}

/* -- Final CTA band -- */
.cta-band {
    text-align: center;
    padding: clamp(2.5rem, 6vw, 4rem);
    background: linear-gradient(135deg, var(--dark) 0%, #2d2b29 100%);
    color: var(--pearl);
    border-radius: var(--radius-lg);
    margin-top: var(--section-y);
}

.cta-band h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: 1rem;
}

.cta-band p {
    color: rgba(255,255,255,0.75);
    max-width: 32em;
    margin: 0 auto 2rem;
}

.cta-band .btn-primary {
    background: var(--accent);
}

.cta-band .btn-primary:hover { background: #8a5939; }

.download-link {
    display: none;
    margin-top: 1rem;
}

.results-panel.revealed .download-link {
    display: block;
}

.download-link a {
    display: block;
    text-align: center;
    padding: 0.85rem;
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: #E8E6E3;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.download-link a:hover { background: rgba(255,255,255,0.15); }

/* -- Logo (jak studiozen.pl) -- */
.logo-img-wrapper {
    display: flex;
    align-items: center;
    flex: 0 1 auto;
    min-width: 0;
    max-width: min(11rem, 42vw);
}

.logo-img {
    width: auto;
    height: clamp(2.5rem, 6vw, 3.5rem);
    max-width: 100%;
    object-fit: contain;
    object-position: left center;
}

.cover-logo {
    width: clamp(9rem, 28vw, 14rem);
    height: auto;
    margin: 0 auto 1.5rem;
    object-fit: contain;
}

.footer-logo {
    width: clamp(7rem, 20vw, 10rem);
    height: auto;
    margin: 0 auto 1rem;
    opacity: 0.85;
}

/* -- Nav actions + mobile menu -- */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.nav-cta {
    padding: 0.65rem 1rem;
    font-size: 0.8125rem;
    white-space: nowrap;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0.5rem;
    border: 1px solid var(--paper-edge);
    border-radius: 0.5rem;
    background: var(--pearl);
    cursor: pointer;
}

.nav-toggle__bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--dark);
    border-radius: 1px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.book-nav.is-open .nav-toggle__bar:first-child {
    transform: translateY(3.5px) rotate(45deg);
}

.book-nav.is-open .nav-toggle__bar:last-child {
    transform: translateY(-3.5px) rotate(-45deg);
}

/* ============================================================
   RESPONSYWNOŚĆ 320px → 1440px
   ============================================================ */

/* 320–479: małe telefony */
@media (max-width: 479px) {
    :root {
        --page-gutter: 1rem;
    }

    .book-nav {
        flex-wrap: wrap;
        padding: 0.65rem 1rem;
        gap: 0.5rem;
    }

    .logo-img-wrapper {
        max-width: min(9.5rem, 48vw);
    }

    .logo-img {
        height: 2.35rem;
    }

    .nav-cta {
        padding: 0.55rem 0.85rem;
        font-size: 0.75rem;
    }

    .nav-toggle {
        display: flex;
    }

    .book-nav .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        order: 3;
        gap: 0;
        padding: 0.5rem 0 0.25rem;
        border-top: 1px solid var(--paper-edge);
    }

    .book-nav.is-open .nav-links {
        display: flex;
    }

    .book-nav .nav-links a {
        padding: 0.65rem 0;
        font-size: 0.9375rem;
    }

    .cover {
        padding: 2rem 1rem 2.5rem;
    }

    .cover h1 {
        font-size: clamp(1.65rem, 8vw, 2rem);
    }

    .cover-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .cover-cta .btn {
        width: 100%;
    }

    .page-inner {
        padding: 1.75rem 1rem;
    }

    .calc-section {
        padding: 1rem;
        border-radius: var(--radius);
    }

    .option-item {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .option-value {
        margin-left: 1.85rem;
        width: 100%;
    }

    .results-panel {
        position: static;
        padding: 1.25rem;
    }

    .result-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .result-row .val {
        font-size: 1.2rem;
    }

    .result-row--highlight .val {
        font-size: 1.65rem;
    }

    .compare-stat {
        font-size: 1.65rem;
    }

    .modal {
        padding: 1.5rem 1.25rem;
        max-height: 90vh;
        overflow-y: auto;
    }

    .author-block {
        grid-template-columns: 1fr;
    }

    .author-photo {
        max-width: 14rem;
        margin: 0 auto;
    }

    .cta-band {
        padding: 2rem 1rem;
        border-radius: var(--radius);
    }

    .btn-lg {
        padding: 0.95rem 1.25rem;
        font-size: 0.875rem;
    }
}

/* 480–639: większe telefony */
@media (min-width: 480px) and (max-width: 639px) {
    .nav-toggle {
        display: flex;
    }

    .book-nav .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        order: 3;
        gap: 0;
        padding-top: 0.5rem;
        border-top: 1px solid var(--paper-edge);
    }

    .book-nav.is-open .nav-links {
        display: flex;
    }

    .book-nav .nav-links a {
        padding: 0.6rem 0;
    }
}

/* 640–767: phablety */
@media (min-width: 640px) and (max-width: 767px) {
    .calc-grid {
        grid-template-columns: 1fr;
    }

    .results-panel {
        position: static;
    }
}

/* 768–1023: tablety */
@media (min-width: 768px) {
    .book-nav .nav-links {
        display: flex;
    }

    .nav-toggle {
        display: none !important;
    }

    .logo-img {
        height: clamp(2.75rem, 4vw, 3.25rem);
    }

    .logo-img-wrapper {
        max-width: 12rem;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .book-shell {
        max-width: 44rem;
    }

    .calc-grid {
        grid-template-columns: 1fr;
    }

    .results-panel {
        position: static;
        margin-top: 0.5rem;
    }
}

/* 1024–1199: mały desktop */
@media (min-width: 1024px) {
    .book-shell {
        max-width: 52rem;
    }

    .calc-grid {
        grid-template-columns: 1.15fr 0.85fr;
        align-items: start;
    }

    .results-panel {
        position: sticky;
        top: 5.5rem;
    }

    .logo-img {
        height: 3.25rem;
    }
}

/* 1200–1439: szeroki desktop */
@media (min-width: 1200px) {
    :root {
        --page-gutter: clamp(2rem, 3vw, 3rem);
    }

    .book-shell {
        max-width: 60rem;
    }

    .page-inner {
        padding: 3.5rem 3.5rem;
    }

    .cover {
        padding: 4.5rem 3.5rem 5rem;
    }

    .chapter-title {
        font-size: clamp(2rem, 2.5vw, 2.85rem);
    }

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

/* 1440+: duże ekrany */
@media (min-width: 1440px) {
    .book-shell {
        max-width: 72rem;
    }

    .book-page {
        border-radius: 2rem;
    }

    .page-inner {
        padding: 4rem 4.5rem;
    }

    .cover {
        padding: 5rem 4.5rem 5.5rem;
    }

    .cover h1 {
        font-size: 3.75rem;
        max-width: 16ch;
    }

    .calc-section {
        padding: 2.75rem;
    }

    .logo-img {
        height: 3.75rem;
    }

    .logo-img-wrapper {
        max-width: 14rem;
    }

    .cover-logo {
        width: 15rem;
    }
}

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