:root {
    --color-blue-900: #08224a;
    --color-blue-700: #0b5cff;
    --color-blue-100: #eaf3ff;
    --color-blue-050: #f5f9ff;
    --color-green-700: #067647;
    --color-green-100: #dcfae6;
    --color-green-050: #ecfdf3;
    --color-ink: #122033;
    --color-muted: #617089;
    --color-line: #dbe7f6;
    --color-white: #ffffff;
    --shadow-soft: 0 24px 70px rgba(8, 34, 74, 0.12);
    --radius: 8px;
    --container: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-ink);
    background: var(--color-white);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.6;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

a {
    color: inherit;
    text-decoration: none;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: 1rem;
    z-index: 20;
    transform: translateY(-160%);
    padding: 0.75rem 1rem;
    background: var(--color-blue-900);
    color: var(--color-white);
    border-radius: var(--radius);
}

.skip-link:focus {
    transform: translateY(0);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-line);
    transition: border-color 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
    border-color: var(--color-line);
    box-shadow: 0 10px 30px rgba(8, 34, 74, 0.06);
}

.nav {
    width: min(var(--container), calc(100% - 2rem));
    min-height: 76px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 800;
    letter-spacing: 0;
    color: var(--color-blue-900);
    white-space: nowrap;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius);
    background: var(--color-blue-700);
    color: var(--color-white);
    font-size: 0.88rem;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    color: var(--color-muted);
    font-size: 0.96rem;
    font-weight: 650;
}

.nav-links a:hover,
.nav-links a:focus-visible {
    color: var(--color-blue-700);
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-white);
}

.menu-toggle span:not(.sr-only) {
    display: block;
    width: 18px;
    height: 2px;
    margin: 4px auto;
    background: var(--color-blue-900);
}

.hero {
    width: min(var(--container), calc(100% - 2rem));
    min-height: calc(100svh - 76px);
    margin: 0 auto;
    padding: clamp(3rem, 7vw, 6.5rem) 0 4rem;
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(320px, 1.08fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 5rem);
}

.hero-content {
    max-width: 660px;
}

.eyebrow {
    margin: 0 0 0.85rem;
    color: var(--color-blue-700);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    overflow-wrap: anywhere;
}

h1 {
    margin: 0;
    color: var(--color-blue-900);
    font-size: clamp(2.65rem, 6vw, 5.75rem);
    line-height: 0.95;
    letter-spacing: 0;
}

h2 {
    margin: 0;
    color: var(--color-blue-900);
    font-size: clamp(2rem, 4vw, 3.6rem);
    line-height: 1;
    letter-spacing: 0;
}

h3 {
    margin: 0 0 0.8rem;
    color: var(--color-blue-900);
    font-size: 1.2rem;
    line-height: 1.25;
}

.hero-text {
    max-width: 58ch;
    margin: 1.5rem 0 0;
    color: var(--color-muted);
    font-size: 1.13rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 2rem;
}

.hero-cta { min-height: 58px; padding: 1rem 1.6rem; font-size: 1.05rem; }

.button {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.05rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    font-weight: 800;
    line-height: 1.1;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.button:hover,
.button:focus-visible {
    transform: translateY(-2px);
}

.button-primary {
    background: var(--color-blue-700);
    color: var(--color-white);
    box-shadow: 0 14px 28px rgba(11, 92, 255, 0.22);
}

.button-success {
    background: var(--color-green-700);
    color: var(--color-white);
    box-shadow: 0 14px 28px rgba(6, 118, 71, 0.22);
}

.button-secondary {
    background: var(--color-white);
    color: var(--color-blue-900);
    border-color: var(--color-line);
}

.hero-media {
    margin: 0;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    background: var(--color-blue-050);
}

.hero-media img {
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: cover;
}

.intro,
.section,
.contact-section {
    width: min(var(--container), calc(100% - 2rem));
    margin: 0 auto;
}

.intro {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    overflow: hidden;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-line);
}

.intro article {
    min-height: 142px;
    padding: 1.35rem;
    background: var(--color-white);
}

.intro strong {
    display: block;
    margin-bottom: 0.45rem;
    color: var(--color-blue-900);
    font-size: 1.02rem;
}

.intro span,
.service-card p,
.contact-section p,
.process-list p {
    color: var(--color-muted);
}

.section {
    padding: clamp(4.5rem, 8vw, 7rem) 0 0;
}

.section-heading {
    max-width: 720px;
    margin-bottom: 2rem;
}

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

.service-card {
    min-height: 230px;
    padding: 1.5rem;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: linear-gradient(180deg, var(--color-white), var(--color-blue-050));
}

.service-card p {
    margin: 0;
}

.process-section {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    gap: clamp(2rem, 6vw, 5rem);
}

.process-list {
    display: grid;
    gap: 0.75rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.process-list li {
    display: grid;
    grid-template-columns: 56px 1fr;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-white);
}

.process-list span {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: var(--color-blue-100);
    color: var(--color-blue-700);
    font-weight: 900;
}

.process-list p {
    margin: 0;
}

.contact-section {
    margin-top: clamp(4.5rem, 8vw, 7rem);
    margin-bottom: clamp(4rem, 7vw, 6rem);
    padding: clamp(2rem, 5vw, 3.2rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    border-radius: var(--radius);
    background: var(--color-blue-900);
    color: var(--color-white);
}

.contact-section h2,
.contact-section .eyebrow,
.contact-section p {
    color: var(--color-white);
}

.contact-section p {
    max-width: 60ch;
    margin: 1rem 0 0;
    opacity: 0.82;
}

.site-footer {
    border-top: 1px solid var(--color-line);
    padding: 1.4rem 1rem;
    color: var(--color-muted);
    text-align: center;
}

.site-footer p {
    margin: 0;
}

.legal-links { margin-top: .45rem; display: flex; justify-content: center; gap: .85rem; font-size: .68rem; line-height: 1.2; }
.legal-links a { color: var(--color-muted); text-decoration: underline; text-decoration-color: var(--color-line); text-underline-offset: 3px; }
.legal-links a:hover, .legal-links a:focus-visible { color: var(--color-blue-700); }
.legal-page { min-height: calc(100svh - 76px); background: var(--color-blue-050); }
.legal-content { width: min(760px, calc(100% - 2rem)); margin: 0 auto; padding: clamp(4rem, 9vw, 7rem) 0; }
.legal-content h1 { font-size: clamp(2.6rem, 7vw, 4.8rem); }
.legal-content h2 { margin-top: 2.5rem; font-size: clamp(1.45rem, 3vw, 2rem); }
.legal-content p, .legal-content address { color: var(--color-muted); }
.legal-content address { margin-top: 1.5rem; padding: 1.5rem; border: 1px solid var(--color-line); border-radius: var(--radius); background: var(--color-white); font-style: normal; line-height: 1.9; }
.legal-content a { color: var(--color-blue-700); text-decoration: underline; text-underline-offset: 3px; }

.converter-hero {
    min-height: min(760px, calc(100svh - 76px));
}

.hero-art { min-width: 0; margin: 0; aspect-ratio: 4 / 3; overflow: hidden; }
.hero-art img { width: 100%; height: 100%; object-fit: cover; object-position: 72% center; }

.format-visual {
    min-height: 430px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-content: center;
    align-items: center;
    gap: 1rem;
    padding: clamp(1.5rem, 5vw, 3.5rem);
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-blue-050);
    box-shadow: var(--shadow-soft);
}

.format-visual p {
    grid-column: 1 / -1;
    margin: 1.5rem 0 0;
    color: var(--color-muted);
    text-align: center;
}

.format-tile {
    display: grid;
    place-items: center;
    min-width: 0;
    aspect-ratio: 1;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-white);
    color: var(--color-blue-900);
    font-weight: 900;
}

.format-tile-large { font-size: clamp(1.25rem, 3vw, 2rem); }
.format-tile-blue { background: var(--color-blue-700); color: var(--color-white); border-color: var(--color-blue-700); }
.conversion-arrow { color: var(--color-blue-700); font-size: 2rem; font-weight: 900; }
.section-copy { max-width: 64ch; margin: 1rem 0 0; color: var(--color-muted); }

.converter-grid,
.feature-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.converter-card {
    min-height: 280px;
    padding: 1.4rem;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-white);
    transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

a.converter-card:hover,
a.converter-card:focus-visible { transform: translateY(-4px); border-color: var(--color-blue-700); box-shadow: 0 18px 40px rgba(8, 34, 74, 0.09); }
.converter-card p { margin: 0; color: var(--color-muted); }
.converter-card.is-coming { background: var(--color-blue-050); }
.format-pair { display: flex; align-items: center; gap: .45rem; margin-bottom: 2rem; }
.format-pair span { padding: .35rem .5rem; border: 1px solid var(--color-line); border-radius: 4px; background: var(--color-white); color: var(--color-blue-900); font-size: .75rem; font-weight: 900; }
.format-pair b { color: var(--color-blue-700); }
.card-action { margin-top: auto; padding-top: 1.5rem; color: var(--color-blue-700); font-size: .9rem; }
.is-coming .card-action { color: var(--color-muted); }

.info-band { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem, 6vw, 5rem); }
.simple-steps { margin: 0; padding: 0; list-style: none; display: grid; gap: .75rem; }
.simple-steps li { display: grid; grid-template-columns: 52px 1fr; gap: 1rem; padding: 1rem; border-top: 1px solid var(--color-line); }
.simple-steps li > span { color: var(--color-blue-700); font-weight: 900; }
.simple-steps h3, .simple-steps p { margin: 0; }
.simple-steps p { color: var(--color-muted); }
.privacy-band { width: 100%; margin-top: clamp(4.5rem, 8vw, 7rem); padding: clamp(4rem, 9vw, 7rem) max(1rem, calc((100% - var(--container)) / 2)); background: var(--color-blue-900); color: var(--color-white); }
.privacy-band h2, .privacy-band .eyebrow { color: var(--color-white); }
.privacy-band p:last-child { max-width: 64ch; margin: 1rem 0 0; opacity: .82; }

.nav-button { min-height: 42px; padding: .65rem .9rem; }
.tool-page { background: var(--color-blue-050); }
.tool-page .site-header { box-shadow: 0 8px 24px rgba(8, 34, 74, 0.05); }
.tool-page main { padding-bottom: clamp(4rem, 8vw, 7rem); }
.tool-intro { width: min(820px, calc(100% - 2rem)); margin: 0 auto; padding: clamp(4rem, 8vw, 6rem) 0 2.5rem; text-align: center; }
.tool-intro h1 { font-size: clamp(2.6rem, 7vw, 5rem); line-height: 1; }
.tool-intro > p:last-child { max-width: 64ch; margin: 1.25rem auto 0; color: var(--color-muted); font-size: 1.1rem; }
.converter-tool { width: min(900px, calc(100% - 2rem)); margin: 0 auto; padding: clamp(1.25rem, 3vw, 2rem); border: 1px solid var(--color-line); border-radius: var(--radius); background: var(--color-white); box-shadow: 0 22px 60px rgba(8, 34, 74, 0.1); }
.tool-progress { margin: 0 0 1.5rem; padding: 0 0 1.5rem; display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--color-line); list-style: none; }
.tool-progress li { position: relative; display: flex; align-items: center; justify-content: center; gap: .6rem; color: var(--color-muted); font-size: .84rem; }
.tool-progress li:not(:last-child)::after { content: ''; position: absolute; top: 50%; right: -12%; width: 24%; height: 1px; background: var(--color-line); }
.tool-progress span { width: 28px; height: 28px; display: grid; place-items: center; flex: 0 0 auto; border: 1px solid var(--color-line); border-radius: 50%; background: var(--color-white); font-size: .75rem; font-weight: 900; }
.tool-progress .is-current { color: var(--color-blue-900); }
.tool-progress .is-current span { border-color: var(--color-blue-700); background: var(--color-blue-700); color: var(--color-white); }
.upload-zone { position: relative; min-height: 300px; display: grid; place-items: center; border: 2px dashed #a9c8f5; border-radius: var(--radius); background: var(--color-blue-050); transition: border-color 180ms ease, background 180ms ease; }
.upload-zone.is-dragging { border-color: var(--color-blue-700); background: var(--color-blue-100); }
.file-input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.upload-label { width: 100%; min-height: 296px; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 2rem; cursor: pointer; text-align: center; }
.upload-icon { width: 52px; height: 52px; display: grid; place-items: center; margin-bottom: 1rem; border-radius: 50%; background: var(--color-blue-700); color: var(--color-white); font-size: 0; line-height: 1; }
.upload-icon::before { content: '+'; display: block; font-size: 2rem; line-height: 1; transform: translateY(-1px); }
.upload-label strong { color: var(--color-blue-900); font-size: 1.15rem; }
.upload-label span:not(.upload-icon), .upload-label small { color: var(--color-muted); }
.upload-label small { margin-top: .65rem; }
.tool-message { margin: 1rem auto 0; width: fit-content; max-width: 100%; padding: 0; color: var(--color-muted); text-align: center; }
.tool-message.is-success { padding: .65rem .85rem; border: 1px solid #a6e0c2; border-radius: 4px; background: var(--color-green-050); color: var(--color-green-700); font-weight: 800; }
.tool-message.is-error { color: #b42318; }
.file-preview { margin-top: 1.5rem; display: grid; grid-template-columns: minmax(160px, 240px) 1fr; gap: 1.5rem; padding: 1rem; border: 1px solid var(--color-line); border-radius: var(--radius); }
.file-preview[hidden], .conversion-result[hidden] { display: none; }
.file-preview img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; background: var(--color-blue-050); border-radius: 4px; }
.file-details { align-self: center; min-width: 0; }
.file-details h3, .file-details p { overflow-wrap: anywhere; }
.file-details h3 { margin-bottom: .3rem; }
.file-details > p:not(.file-status) { margin: 0; color: var(--color-muted); }
.file-status { margin: 0 0 .5rem; color: #067647; font-weight: 800; }
.preview-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-top: 1.25rem; }
.text-button { padding: .6rem; border: 0; background: transparent; color: var(--color-muted); font: inherit; font-weight: 700; cursor: pointer; }
.text-button:hover { color: #b42318; }
.conversion-result { margin-top: 1.5rem; padding: 1.4rem; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; border: 1px solid #a6e0c2; border-radius: var(--radius); background: #ecfdf3; }
.conversion-result h2 { font-size: clamp(1.7rem, 4vw, 2.4rem); }
.conversion-result p { margin: .35rem 0 0; color: #41715a; }
.article-content { max-width: 1000px; margin-top: clamp(4.5rem, 8vw, 7rem); padding: clamp(2rem, 5vw, 3.5rem); border: 1px solid var(--color-line); border-radius: var(--radius); background: var(--color-white); }
.article-content > p:not(.eyebrow) { max-width: 72ch; color: var(--color-muted); }
.seo-content-block a { color: var(--color-blue-700); font-weight: 700; text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: .18em; }
.seo-content-block a:hover { color: var(--color-blue-900); text-decoration-thickness: 3px; }
.seo-content-block a:focus-visible { border-radius: 2px; outline: 3px solid rgba(11, 92, 255, .25); outline-offset: 3px; }
.feature-row { grid-template-columns: repeat(3, 1fr); margin-top: 2rem; }
.feature-row article { padding-top: 1.2rem; border-top: 2px solid var(--color-blue-700); }
.feature-row p { color: var(--color-muted); }
.multi-file-note { width: fit-content; margin: 1rem auto 0 !important; padding: .65rem .85rem; border: 1px solid #a6e0c2; border-radius: 4px; background: #ecfdf3; color: #067647 !important; font-size: .9rem !important; }
.multi-file-panel, .pdf-file-panel, .pdf-results { margin-top: 1.5rem; padding: 1.25rem; border: 1px solid var(--color-line); border-radius: var(--radius); background: var(--color-white); }
.multi-file-panel[hidden], .pdf-file-panel[hidden], .pdf-results[hidden] { display: none; }
.panel-heading, .pdf-file-panel { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }
.panel-heading h2, .pdf-file-panel h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
.panel-heading .eyebrow { margin-bottom: .35rem; }
.selected-file-list { margin: 1.25rem 0; padding: 0; display: grid; gap: .65rem; list-style: none; }
.selected-file-item { min-width: 0; display: grid; grid-template-columns: 64px minmax(0, 1fr) 36px; align-items: center; gap: .9rem; padding: .65rem; border: 1px solid var(--color-line); border-radius: 6px; }
.selected-file-item img { width: 64px; height: 52px; object-fit: contain; border-radius: 4px; background: var(--color-blue-050); }
.selected-file-item div { min-width: 0; display: grid; }
.selected-file-item strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.selected-file-item span { color: var(--color-muted); font-size: .82rem; }
.selected-file-item button { width: 34px; height: 34px; border: 0; border-radius: 4px; background: transparent; color: var(--color-muted); font-size: 1.35rem; cursor: pointer; }
.selected-file-item button:hover { background: #fff1f0; color: #b42318; }
.wide-action { width: 100%; }
.add-more { cursor: pointer; }
.pdf-file-panel > div:first-child { min-width: 0; }
.pdf-file-panel h2 { overflow-wrap: anywhere; }
.pdf-file-panel p { margin: .3rem 0 0; color: var(--color-muted); }
.pdf-file-panel .file-status { color: #067647; }
.pdf-results { margin-top: 1.5rem; }
.page-result-grid { margin-top: 1.5rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.page-result-card { min-width: 0; padding: .75rem; display: grid; gap: .75rem; border: 1px solid var(--color-line); border-radius: 6px; }
.page-result-card img { width: 100%; aspect-ratio: 3 / 4; object-fit: contain; background: var(--color-blue-050); }
.page-result-card > div { min-width: 0; display: flex; justify-content: space-between; gap: .5rem; }
.page-result-card span { color: var(--color-muted); font-size: .82rem; }
.faq-section { max-width: 1000px; padding-bottom: clamp(4rem, 8vw, 7rem); }
.faq-section .section-heading { margin-bottom: 1.5rem; }
.faq-list { border-top: 1px solid var(--color-line); }
.faq-list details { border-bottom: 1px solid var(--color-line); background: var(--color-white); }
.faq-list summary { position: relative; padding: 1.25rem 4rem 1.25rem 1.25rem; color: var(--color-blue-900); font-weight: 800; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; position: absolute; top: 50%; right: 1.25rem; width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; padding-bottom: 2px; transform: translateY(-50%); border: 1px solid var(--color-line); border-radius: 50%; color: var(--color-blue-700); font-family: Arial, sans-serif; font-size: 1.15rem; line-height: 1; box-sizing: border-box; }
.faq-list details[open] summary::after { content: '\2212'; }
.faq-list details p { max-width: 72ch; margin: 0; padding: 0 4rem 1.25rem 1.25rem; color: var(--color-muted); }

@media (max-width: 900px) {
    .menu-toggle {
        display: inline-block;
    }

    .nav-links {
        position: absolute;
        left: 1rem;
        right: 1rem;
        top: 76px;
        display: none;
        padding: 0.7rem;
        border: 1px solid var(--color-line);
        border-radius: var(--radius);
        background: var(--color-white);
        box-shadow: var(--shadow-soft);
    }

    .nav-links.is-open {
        display: grid;
    }

    .nav-links a {
        padding: 0.8rem;
    }

    .hero,
    .process-section,
    .info-band {
        grid-template-columns: 1fr;
    }

    .hero {
        padding-top: 3rem;
    }

    .hero-media {
        order: -1;
    }

    .intro,
    .service-grid,
    .converter-grid,
    .feature-row {
        grid-template-columns: 1fr;
    }

    .format-visual { min-height: 330px; }

    .contact-section {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 560px) {
    .nav {
        width: min(var(--container), calc(100% - 1rem));
    }

    .tool-page .nav { min-height: 68px; }
    .tool-page .brand { gap: .5rem; font-size: .9rem; }
    .tool-page .brand-mark { width: 36px; height: 36px; }

    .hero,
    .intro,
    .section,
    .contact-section {
        width: min(var(--container), calc(100% - 1rem));
    }

    h1 {
        font-size: clamp(2.25rem, 13vw, 3.5rem);
    }

    .hero-actions,
    .button {
        width: 100%;
    }

    .process-list li {
        grid-template-columns: 1fr;
    }

    .file-preview { grid-template-columns: 1fr; }
    .conversion-result { align-items: stretch; flex-direction: column; }
    .panel-heading, .pdf-file-panel { align-items: stretch; flex-direction: column; }
    .page-result-grid { grid-template-columns: 1fr; }

    .tool-intro { padding-top: 3rem; }
    .tool-progress { gap: .35rem; }
    .tool-progress li { flex-direction: column; gap: .35rem; text-align: center; }
    .tool-progress li::after { display: none; }
    .tool-progress strong { font-size: .72rem; }
    .upload-zone, .upload-label { min-height: 250px; }
    .nav-button { min-height: 40px; padding: .55rem .7rem; font-size: .82rem; }
}