:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-soft: #ffffff;
  --ink: #1b2526;
  --muted: #697577;
  --muted-light: #8b9696;
  --line: #e3e9e6;
  --line-strong: #ccd8d3;
  --accent: #4c8a72;
  --accent-deep: #28634e;
  --accent-soft: #edf6f1;
  --danger: #b15d58;
  --shadow: 0 16px 40px rgba(33, 54, 47, .08), 0 2px 7px rgba(33, 54, 47, .04);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: Inter, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif; font-size: 15px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
.hidden { display: none !important; }

.site-header { height: 72px; padding: 0 max(28px, calc((100vw - 1180px) / 2)); display: flex; align-items: center; gap: 34px; background: rgba(255,255,255,.95); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 750; font-size: 16px; white-space: nowrap; letter-spacing: -.02em; }
.brand-mark { display: grid; grid-template-columns: repeat(2, 10px); gap: 4px; transform: rotate(-7deg); }
.brand-mark i { display: block; width: 10px; height: 14px; border-radius: 3px; background: var(--accent); }
.brand-mark i:nth-child(2), .brand-mark i:nth-child(3) { background: #77aa91; }
.top-nav { display: flex; align-items: center; gap: 25px; margin-left: 62px; height: 100%; }
.top-nav a { height: 100%; display: inline-flex; align-items: center; color: var(--muted); font-size: 13px; font-weight: 600; border-bottom: 2px solid transparent; }
.top-nav a:hover, .top-nav a.active { color: var(--ink); border-bottom-color: var(--accent); }
.header-note { margin-left: auto; display: flex; align-items: center; gap: 8px; color: var(--muted); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; letter-spacing: .06em; white-space: nowrap; }
.status-dot { width: 8px; height: 8px; flex: 0 0 auto; border-radius: 50%; background: #5da681; box-shadow: 0 0 0 4px #e9f4ee; }
.language-menu { position: relative; }
.language-toggle { border: 1px solid var(--line-strong); background: #fff; color: var(--ink); padding: 7px 11px; font-size: 12px; }
.language-toggle:hover { border-color: var(--accent); color: var(--accent-deep); }
.language-options { position: absolute; top: calc(100% + 8px); right: 0; z-index: 30; width: 240px; padding: 5px; background: #fff; border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 12px 28px rgba(33, 54, 47, .12), 0 2px 6px rgba(33, 54, 47, .05); }
.language-option { width: 100%; min-height: 36px; padding: 8px 10px; display: grid; grid-template-columns: 28px 1fr 18px; align-items: center; gap: 8px; border: 0; border-radius: 7px; background: #fff; color: var(--ink); text-align: left; font-size: 14px; }
.language-option > span:first-child { color: var(--muted); font-family: "Segoe UI", Arial, sans-serif; font-size: 12px; }
.language-option > span:last-child { color: var(--accent); font-size: 16px; font-weight: 700; text-align: center; }
.language-option:hover, .language-option.selected { background: #f5f7f6; }

main { width: min(100%, 1180px); margin: 0 auto; padding: 0 28px 80px; }
.hero { padding: 74px 0 36px; display: flex; justify-content: center; text-align: center; }
.hero-copy { max-width: 720px; }
.eyebrow, .section-kicker { margin: 0 0 17px; color: var(--accent-deep); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; font-weight: 700; letter-spacing: .13em; }
.eyebrow span { margin-right: 11px; color: var(--muted-light); }
.hero h1 { margin: 0; color: var(--ink); font-size: clamp(38px, 5.5vw, 62px); line-height: 1.08; letter-spacing: -.055em; font-weight: 760; }
.hero h1 em { color: var(--muted-light); font-style: normal; }
.hero-lede { max-width: 600px; margin: 22px auto 0; color: var(--muted); font-size: 16px; line-height: 1.8; }
.hero-meta { display: flex; justify-content: center; flex-wrap: wrap; gap: 22px; margin-top: 24px; color: var(--muted); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; }
.hero-meta b { color: var(--ink); font-weight: 750; }

.converter-card { width: min(100%, 900px); margin: 0 auto; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); scroll-margin-top: 92px; }
.seo-locked-target .mode-tabs { display: none; }
.mode-tabs { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.mode-tab { min-height: 72px; padding: 13px 22px; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 2px; border: 0; border-right: 1px solid var(--line); background: transparent; color: var(--muted); text-align: left; }
.mode-tab:last-child { border-right: 0; }
.mode-tab:hover { background: #f5faf7; color: var(--ink); }
.mode-tab.selected { background: #fff; color: var(--ink); box-shadow: inset 0 -2px 0 var(--accent); }
.mode-tab:disabled { cursor: default; opacity: .62; }
.mode-tab.selected:disabled { opacity: 1; }
.mode-tab-title { font-weight: 750; font-size: 15px; }
.mode-tab small { color: var(--muted); font-size: 11px; }
.card-heading { padding: 25px 30px 20px; display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; border-bottom: 1px solid #f0f3f1; }
.section-kicker { margin-bottom: 7px; color: var(--muted-light); font-size: 10px; }
.card-heading h2 { margin: 0; font-size: 25px; line-height: 1.2; letter-spacing: -.035em; }
.card-heading p:not(.section-kicker) { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
.clear-button { border: 0; background: transparent; color: var(--muted); padding: 4px 0; font-size: 12px; white-space: nowrap; }
.clear-button:hover { color: var(--accent-deep); }
.drop-zone { min-height: 292px; margin: 24px 30px 0; padding: 46px 28px 38px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; border: 2px dashed var(--line-strong); background: #fff; box-shadow: inset 0 0 0 1px #f4f7f5, 0 2px 8px rgba(33, 54, 47, .025); transition: border-color .18s, background .18s, transform .18s; }
.drop-zone:hover, .drop-zone.dragging { border-color: var(--accent); background: var(--accent-soft); }
.drop-zone.dragging { transform: translateY(-2px); }
.drop-icon { width: 52px; height: 52px; display: grid; place-items: center; margin-bottom: 17px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-deep); font-size: 27px; font-weight: 400; }
.drop-zone h3 { margin: 0; font-size: 21px; letter-spacing: -.025em; }
.drop-zone p { margin: 6px 0 20px; color: var(--muted); font-size: 13px; }
.primary-button { border: 0; background: var(--accent); color: #fff; padding: 12px 20px; font-size: 13px; font-weight: 750; box-shadow: 0 6px 16px rgba(76,138,114,.18); }
.primary-button:hover { background: var(--accent-deep); }
.primary-button:disabled { cursor: wait; opacity: .65; }
.drop-hint { margin-top: 19px; color: var(--muted-light); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; }

.queue-wrap { margin: 20px 30px 0; border: 1px solid var(--line); }
.queue-head { min-height: 45px; padding: 0 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.queue-head b { color: var(--ink); }
.queue-list { max-height: 268px; overflow: auto; }
.queue-item { min-height: 64px; padding: 9px 12px; display: flex; align-items: center; gap: 11px; border-bottom: 1px solid #eef2f0; }
.queue-item:last-child { border-bottom: 0; }
.queue-thumb { width: 42px; height: 42px; flex: 0 0 auto; object-fit: cover; background: #f0f3f2; border: 1px solid var(--line); }
.queue-file { min-width: 0; flex: 1; }
.queue-name { display: block; overflow: hidden; color: var(--ink); font-size: 13px; font-weight: 650; text-overflow: ellipsis; white-space: nowrap; }
.queue-meta { display: block; color: var(--muted-light); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; }
.queue-size-arrow { margin: 0 5px; color: var(--accent-deep); font-weight: 800; }
.queue-status { color: var(--muted); font-size: 12px; white-space: nowrap; }
.queue-status.done { color: var(--accent-deep); }
.queue-status.failed { color: var(--danger); }
.queue-actions { display: flex; align-items: center; gap: 7px; }
.queue-download { min-width: 74px; border: 1px solid var(--accent); background: var(--accent); color: #fff; padding: 8px 12px; font-size: 12px; font-weight: 750; }
.queue-download:hover { border-color: var(--accent-deep); background: var(--accent-deep); }
.remove-file { border: 0; background: transparent; color: var(--muted-light); padding: 4px; font-size: 16px; line-height: 1; }
.remove-file:hover { color: var(--danger); }

.settings-panel { margin: 20px 30px 0; border-top: 1px solid var(--line); }
.setting-row { min-height: 76px; padding: 17px 0; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.setting-row label { display: block; color: var(--ink); font-size: 13px; font-weight: 750; }
.setting-description { margin: 2px 0 0; color: var(--muted-light); font-size: 11px; }
.format-options { display: flex; flex-wrap: wrap; gap: 7px; }
.format-options-wrap { width: min(100%, 560px); }
.format-popular, .format-advanced { display: flex; flex-wrap: wrap; gap: 7px; }
.format-more { margin-top: 9px; }
.format-more summary { width: max-content; color: var(--accent-deep); cursor: pointer; font-size: 12px; font-weight: 700; }
.format-advanced { margin-top: 10px; padding-top: 11px; border-top: 1px solid var(--line); }
.format-button { min-width: 64px; border: 1px solid var(--line-strong); background: #fff; color: var(--muted); padding: 8px 13px; font-family: "Segoe UI", Arial, sans-serif; font-size: 12px; font-weight: 700; }
.format-button:hover { border-color: var(--accent); color: var(--accent-deep); }
.format-button.selected { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-deep); }
.format-button.fixed { cursor: default; }
.format-button.unavailable { color: var(--muted-light); background: #f7f8f7; border-color: var(--line); cursor: not-allowed; }
.resize-controls { display: flex; align-items: center; gap: 8px; }
.setting-select { min-width: 190px; border: 1px solid var(--line-strong); background: #fff; color: var(--ink); padding: 9px 34px 9px 11px; font-size: 13px; }
.resize-value { display: flex; align-items: center; border: 1px solid var(--line-strong); background: #fff; }
.resize-value input { width: 92px; border: 0; outline: 0; padding: 9px 8px 9px 11px; color: var(--ink); font-size: 13px; }
.resize-value span { padding: 0 10px 0 3px; color: var(--muted); font-size: 12px; }
.quality-control { min-width: 260px; display: grid; grid-template-columns: minmax(170px, 1fr) 48px; align-items: center; gap: 12px; }
.quality-control input { width: 100%; accent-color: var(--accent); }
.quality-control output { color: var(--accent-deep); font-size: 13px; font-weight: 750; text-align: right; }

.action-bar { margin: 20px 30px 26px; padding: 13px 14px; display: flex; align-items: center; justify-content: space-between; gap: 18px; border: 1px solid var(--line); background: #fff; }
.batch-target { display: flex; align-items: center; gap: 9px; color: var(--ink); font-size: 13px; }
.batch-target strong { padding: 7px 10px; background: var(--accent-soft); color: var(--accent-deep); font-family: "Segoe UI", Arial, sans-serif; font-size: 12px; text-transform: lowercase; }
.batch-actions { display: flex; align-items: center; gap: 13px; }
.action-button { min-width: 138px; }
.secondary-button { border: 1px solid var(--accent); background: #fff; color: var(--accent-deep); padding: 9px 13px; font-size: 12px; font-weight: 750; }
.secondary-button:hover { background: var(--accent); color: #fff; }
.text-button { border: 0; background: transparent; color: var(--accent-deep); padding: 4px 0; font-size: 12px; }

.trust-row { width: min(100%, 900px); margin: 32px auto 0; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.trust-row article { min-height: 82px; padding: 17px 19px; display: flex; align-items: center; gap: 12px; border-right: 1px solid var(--line); }
.trust-row article:last-child { border-right: 0; }
.trust-row article > span { color: var(--muted-light); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; }
.trust-row b, .trust-row small { display: block; }
.trust-row b { font-size: 12px; }
.trust-row small { margin-top: 2px; color: var(--muted); font-size: 11px; }

.how-section { width: min(100%, 900px); margin: 100px auto 0; }
.privacy-hero { padding-bottom: 30px; }
.privacy-content { width: min(100%, 900px); margin: 0 auto 70px; }
.privacy-card { padding: 8px 30px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.privacy-block { padding: 24px 0; border-bottom: 1px solid var(--line); }
.privacy-block:last-child { border-bottom: 0; }
.privacy-block h2 { margin: 0 0 8px; font-size: 20px; letter-spacing: -.025em; }
.privacy-block p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
.section-intro { max-width: 570px; }
.section-intro h2 { margin: 0; font-size: 31px; line-height: 1.2; letter-spacing: -.04em; }
.section-intro > p:last-child { margin: 14px 0 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.steps { margin-top: 32px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.steps article { padding-top: 16px; border-top: 1px solid var(--line-strong); }
.step-num { color: var(--accent-deep); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; font-weight: 750; }
.steps h3 { margin: 20px 0 7px; font-size: 17px; }
.steps p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.comparison-section, .quality-guide, .common-faq { width: min(100%, 900px); margin: 90px auto 0; }
.comparison-demo { height: 430px; margin-top: 30px; position: relative; overflow: hidden; border: 1px solid var(--line); background: #e9f0ec; box-shadow: var(--shadow); }
.comparison-demo > img, .comparison-after, .comparison-after img { width: 100%; height: 100%; object-fit: cover; }
.comparison-demo > img { display: block; }
.comparison-after { position: absolute; inset: 0 auto 0 0; width: 50%; overflow: hidden; }
.comparison-after img { max-width: none; display: block; }
.comparison-divider { position: absolute; top: 0; bottom: 0; left: 50%; width: 2px; transform: translateX(-1px); background: #fff; box-shadow: 0 0 0 1px rgba(27,37,38,.2); pointer-events: none; }
.comparison-divider::after { content: '↔'; position: absolute; top: 50%; left: 50%; width: 44px; height: 44px; display: grid; place-items: center; transform: translate(-50%,-50%); border-radius: 50%; background: #fff; color: var(--accent-deep); box-shadow: 0 5px 18px rgba(27,37,38,.18); font-size: 18px; }
.comparison-slider { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: ew-resize; }
.comparison-badge { position: absolute; top: 18px; padding: 8px 11px; display: flex; align-items: center; gap: 8px; background: rgba(255,255,255,.92); box-shadow: 0 3px 12px rgba(27,37,38,.1); font-size: 12px; }
.comparison-badge.before { left: 18px; }
.comparison-badge.after { right: 18px; }
.comparison-badge small { color: var(--muted); }
.quality-levels { margin-top: 30px; display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }
.quality-levels article { min-height: 180px; padding: 24px; border-right: 1px solid var(--line); }
.quality-levels article:last-child { border-right: 0; }
.quality-levels article > b { color: var(--accent-deep); font-size: 12px; letter-spacing: .08em; }
.quality-levels h3 { margin: 22px 0 8px; font-size: 17px; }
.quality-levels p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }
.faq-list { margin-top: 28px; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { padding: 18px 4px; cursor: pointer; color: var(--ink); font-size: 15px; font-weight: 720; }
.faq-list details p { max-width: 720px; margin: -4px 4px 19px; color: var(--muted); font-size: 13px; line-height: 1.8; }

.seo-directory, .seo-content { width: min(100%, 900px); margin: 44px auto 0; padding: 30px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.seo-directory-head { max-width: 580px; }
.seo-directory h2, .seo-content h2 { margin: 0; font-size: 27px; line-height: 1.2; letter-spacing: -.035em; }
.seo-directory-head > p:last-child, .seo-content-grid > div > p:last-child, .seo-copy-block p { margin: 12px 0 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.seo-link-grid { margin-top: 26px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.seo-link-grid a { min-height: 63px; padding: 11px 12px; display: flex; flex-direction: column; justify-content: center; gap: 3px; border: 1px solid var(--line); background: var(--surface-soft); box-shadow: 0 1px 2px rgba(33, 54, 47, .025); }
.seo-link-grid a:hover { border-color: var(--accent); background: var(--accent-soft); }
.seo-link-grid b { color: var(--ink); font-size: 12px; line-height: 1.25; }
.seo-link-grid small { color: var(--muted); font-family: "Segoe UI", Arial, sans-serif; font-size: 10px; }
.seo-more-formats { margin-top: 14px; }
.seo-more-formats > summary { color: var(--accent-deep); cursor: pointer; font-size: 13px; font-weight: 750; }
.seo-more-formats > .seo-link-grid, .seo-more-formats > .mutual-format-grid { margin-top: 14px; }
.mutual-format-grid { margin-top: 26px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.mutual-format-card { min-height: 63px; padding: 11px 12px; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: 3px; border: 1px solid var(--line); background: var(--surface-soft); color: var(--ink); text-align: left; box-shadow: 0 1px 2px rgba(33, 54, 47, .025); }
.mutual-format-card:hover { border-color: var(--accent); background: var(--accent-soft); }
.mutual-format-card b { font-size: 12px; line-height: 1.25; }
.mutual-format-card small { color: var(--muted); font-family: "Segoe UI", Arial, sans-serif; font-size: 10px; }
.seo-content { margin-top: 28px; }
.seo-content-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .9fr); gap: 42px; }
.seo-content-grid h2 { max-width: 430px; }
.seo-steps { margin: 0; padding: 0; list-style: none; counter-reset: seo-step; }
.seo-steps li { padding: 0 0 17px 35px; position: relative; border-bottom: 1px solid var(--line); counter-increment: seo-step; }
.seo-steps li + li { padding-top: 17px; }
.seo-steps li::before { content: counter(seo-step, decimal-leading-zero); position: absolute; left: 0; top: 1px; color: var(--accent-deep); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; font-weight: 750; }
.seo-steps b, .seo-steps span { display: block; }
.seo-steps b { font-size: 14px; }
.seo-steps span { margin-top: 3px; color: var(--muted); font-size: 13px; line-height: 1.65; }
.seo-copy-block { margin-top: 32px; padding-top: 25px; border-top: 1px solid var(--line); }
.seo-copy-block h2, .seo-faq h2 { font-size: 21px; }
.seo-faq { margin-top: 30px; padding-top: 25px; border-top: 1px solid var(--line); }
.seo-faq details { border-bottom: 1px solid var(--line); }
.seo-faq summary { padding: 14px 0; color: var(--ink); cursor: pointer; font-size: 14px; font-weight: 700; }
.seo-faq details p { margin: 0 0 14px; color: var(--muted); font-size: 13px; line-height: 1.75; }
.seo-breadcrumb { width: min(100%, 900px); margin: 28px auto -18px; display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); font-size: 12px; }
.seo-breadcrumb a:hover { color: var(--accent-deep); }
.seo-breadcrumb > span:last-child { color: var(--ink); }
.seo-format-facts { margin-top: 34px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: stretch; gap: 18px; }
.seo-format-facts article { padding: 20px; border: 1px solid var(--line); background: #fff; }
.seo-format-facts article > span { color: var(--accent-deep); font-size: 10px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.seo-format-facts article h2 { margin-top: 8px; font-size: 23px; }
.seo-format-facts article p, .seo-note p { margin: 8px 0 0; color: var(--muted); font-size: 13px; line-height: 1.75; }
.seo-format-arrow { align-self: center; color: var(--accent); font-size: 24px; }
.seo-note { margin-top: 26px; padding: 18px 20px; border-left: 3px solid var(--accent); background: var(--accent-soft); }
.seo-note b { font-size: 13px; }
.seo-related { margin-top: 30px; padding-top: 25px; border-top: 1px solid var(--line); }
.seo-related > div:first-child { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; }
.seo-related h2 { font-size: 21px; }
.seo-all-link { color: var(--accent-deep); font-size: 12px; font-weight: 700; }
.seo-hub-copy { padding-top: 0; }

.site-footer { width: min(100%, 1180px); margin: 0 auto; padding: 25px 28px 34px; display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--muted-light); border-top: 1px solid var(--line); font-family: "Segoe UI", Arial, sans-serif; font-size: 11px; }
.site-footer a:hover { color: var(--accent-deep); }
.toast { position: fixed; left: 50%; bottom: 26px; z-index: 20; max-width: min(90vw, 440px); transform: translate(-50%, 18px); padding: 11px 15px; background: var(--ink); color: #fff; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; font-size: 12px; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 800px) {
  .site-header { gap: 18px; padding: 0 18px; }
  .top-nav { margin-left: 10px; gap: 14px; }
  .header-note { display: none; }
  main { padding-left: 18px; padding-right: 18px; }
  .hero { padding-top: 55px; }
}
@media (max-width: 620px) {
  .site-header { height: 64px; }
  .brand { font-size: 15px; }
  .top-nav { display: none; }
  .language-toggle { margin-left: auto; }
  .hero h1 { font-size: 38px; }
  .hero-lede { font-size: 14px; }
  .hero-meta { gap: 10px 15px; font-size: 10px; }
  .mode-tab { min-height: 78px; padding: 12px 14px; }
  .mode-tab-title { font-size: 13px; }
  .mode-tab small { font-size: 10px; }
  .card-heading { padding: 21px 18px 17px; }
  .card-heading h2 { font-size: 21px; }
  .card-heading p:not(.section-kicker) { font-size: 12px; }
  .drop-zone { min-height: 260px; margin: 0 18px; padding: 32px 17px; }
  .drop-zone h3 { font-size: 19px; }
  .drop-zone p { font-size: 12px; }
  .queue-wrap, .settings-panel { margin-left: 18px; margin-right: 18px; }
  .setting-row { align-items: flex-start; flex-direction: column; }
  .converter-card { scroll-margin-top: 76px; }
  .format-options, .format-options-wrap { width: 100%; }
  .format-button { flex: 1; }
  .action-bar { position: sticky; bottom: 8px; z-index: 8; margin: 16px 10px 18px; padding: 11px 12px; align-items: stretch; flex-direction: column; box-shadow: 0 10px 30px rgba(33, 54, 47, .16); }
  .resize-controls, .setting-select, .quality-control { width: 100%; }
  .resize-controls { align-items: stretch; flex-direction: column; }
  .resize-value input { width: 100%; }
  .batch-actions { width: 100%; justify-content: space-between; }
  .action-button { width: 100%; }
  .batch-actions .action-button { flex: 1; }
  .trust-row { grid-template-columns: 1fr; }
  .trust-row article { border-right: 0; border-bottom: 1px solid var(--line); }
  .trust-row article:last-child { border-bottom: 0; }
  .how-section { margin-top: 70px; }
  .seo-directory, .seo-content { margin-top: 34px; padding: 21px 18px; }
  .seo-directory h2, .seo-content h2 { font-size: 23px; }
  .seo-link-grid { grid-template-columns: repeat(2, 1fr); }
  .mutual-format-grid { grid-template-columns: repeat(2, 1fr); }
  .seo-content-grid { grid-template-columns: 1fr; gap: 28px; }
  .seo-breadcrumb { margin-top: 22px; }
  .seo-format-facts { grid-template-columns: 1fr; gap: 10px; }
  .seo-format-arrow { justify-self: center; transform: rotate(90deg); }
  .seo-related > div:first-child { align-items: flex-start; flex-direction: column; gap: 7px; }
  .privacy-card { padding-left: 18px; padding-right: 18px; }
  .steps { grid-template-columns: 1fr; gap: 25px; }
  .comparison-section, .quality-guide, .common-faq { margin-top: 70px; }
  .comparison-demo { height: 260px; }
  .comparison-badge { top: 10px; padding: 6px 8px; gap: 5px; }
  .comparison-badge.before { left: 10px; }
  .comparison-badge.after { right: 10px; }
  .quality-levels { grid-template-columns: 1fr; }
  .quality-levels article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .quality-levels article:last-child { border-bottom: 0; }
  .site-footer { align-items: flex-start; flex-direction: column; padding-left: 18px; padding-right: 18px; }
}