:root {
    --color-text: #27313a;
    --color-muted: #5d6973;
    --color-subtle: #75808a;
    --color-accent: #0787dc;
    --color-accent-dark: #056ba9;
    --color-surface: #f5f7f8;
    --color-surface-alt: #eceff1;
    --color-border: #dce2e6;
    --color-warning-bg: #fff8df;
    --color-warning-text: #655927;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --content-width: 1120px;
    --reading-width: 820px;
    --section-space: 72px;
    --radius: 14px;
}

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

html {
    color: var(--color-text);
    font-size: 16px;
    line-height: 1.6;
    scroll-behavior: smooth;
}

body {
    background: #fff;
    color: var(--color-text);
    font-family: var(--font-sans);
    margin: 0;
    text-rendering: optimizeLegibility;
}

body.lightbox_open {
    overflow: hidden;
}

::selection {
    background: #cceaff;
}

img {
    height: auto;
    max-width: 100%;
    vertical-align: middle;
}

a {
    color: var(--color-accent);
    text-decoration-color: transparent;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 150ms ease, text-decoration-color 150ms ease;
}

a:hover {
    color: var(--color-accent-dark);
    text-decoration-color: currentColor;
}

a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible {
    outline: 3px solid rgba(7, 135, 220, 0.35);
    outline-offset: 4px;
}

h1,
h2,
h3 {
    color: var(--color-text);
    font-family: var(--font-sans);
    font-weight: 500;
    letter-spacing: -0.03em;
    line-height: 1.15;
}

html[lang^="zh"] h1,
html[lang^="zh"] h2,
html[lang^="zh"] h3,
html[lang^="zh"] .site_brand_text {
    letter-spacing: 0;
}

html[lang^="zh"] .eyebrow {
    letter-spacing: 0.06em;
}

strong {
    font-weight: 600;
}

h1 {
    font-size: clamp(42px, 6vw, 72px);
    margin: 0 0 24px;
}

h2 {
    font-size: clamp(30px, 4vw, 46px);
    margin: 0 0 18px;
    text-align: center;
}

h3 {
    font-size: 21px;
    margin: 0 0 10px;
}

p {
    margin: 0 0 18px;
}

code {
    background: rgba(39, 49, 58, 0.07);
    border-radius: 5px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.12em 0.35em;
}

hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: 48px 0;
}

header {
    margin: 0 auto;
    max-width: var(--content-width);
    padding: 32px 24px 30px;
    position: relative;
    text-align: center;
}

.site_brand,
.site_brand:hover {
    color: var(--color-text);
    text-decoration: none;
}

.site_brand_name {
    align-items: center;
    display: inline-flex;
}

.site_brand_text {
    font-size: 56px;
    font-weight: 200;
    letter-spacing: -0.045em;
    line-height: 1;
    margin-left: 20px;
}

.site_brand_f {
    color: #15191d;
}

.site_brand_s {
    color: var(--color-accent);
    margin-right: 0.015em;
}

.fsnotes_logo {
    border: 2px solid #8b9297;
    border-radius: 28%;
    width: 96px;
}

.navi {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 28px;
    justify-content: center;
    list-style: none;
    margin: 28px 0 0;
    padding: 0;
}

.navi li {
    margin: 0;
    padding: 0;
}

.navi a {
    font-size: 17px;
    font-weight: 500;
}

.language_switcher {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin: 0;
    position: absolute;
    right: 24px;
    top: 32px;
}

.language_switcher a {
    border-bottom: 1px solid transparent;
    color: var(--color-muted);
    font-size: 14px;
    font-weight: 500;
    padding: 2px 0 3px;
    text-decoration: none;
}

.language_switcher a:hover {
    border-bottom-color: var(--color-accent);
    color: var(--color-accent);
    text-decoration: none;
}

.language_switcher a[aria-current="page"] {
    border-bottom-color: var(--color-accent);
    color: var(--color-text);
    font-weight: 600;
    text-decoration: none;
}

.wide_container {
    background: var(--color-surface-alt);
}

.container,
.basic_container,
.index_container {
    margin: 0 auto;
    max-width: var(--content-width);
    padding: var(--section-space) 24px;
    width: 100%;
}

.eyebrow {
    color: var(--color-accent-dark);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.11em;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.centered {
    text-align: center;
}

.section_intro {
    color: var(--color-muted);
    font-size: 19px;
    line-height: 1.65;
    margin: 0 auto 38px;
    max-width: 760px;
    text-align: center;
}

.hero {
    padding: 0 24px;
}

.hero_inner {
    align-items: center;
    display: grid;
    gap: 64px;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.95fr);
    margin: 0 auto;
    max-width: var(--content-width);
    padding: 76px 0;
}

.hero_copy h1 {
    letter-spacing: -0.048em;
}

.hero_lead {
    color: var(--color-muted);
    font-size: 20px;
    line-height: 1.65;
    margin-bottom: 0;
}

.hero_actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 28px 0 14px;
}

.hero_actions img,
.footer_store_buttons img {
    display: block;
    height: 48px;
    width: auto;
}

.app_store_buttons a,
.app_store_buttons a:hover {
    display: inline-block;
    text-decoration: none;
}

.hero_note {
    color: var(--color-subtle);
    font-size: 14px;
    margin: 0;
}

.hero_visual img,
.split_section img {
    border-radius: 12px;
    display: block;
    width: 100%;
}

.feature_grid,
.community_grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 38px;
}

.feature_card,
.community_card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 26px;
}

.feature_card p,
.community_card p {
    color: var(--color-muted);
    line-height: 1.65;
    margin: 0;
}

.product_detail .basic_container {
    padding-bottom: 64px;
    padding-top: 64px;
}

.split_section {
    align-items: center;
    display: grid;
    gap: 64px;
    grid-template-columns: 1fr 1fr;
}

.split_section h2 {
    text-align: left;
}

.split_section p:not(.eyebrow) {
    color: var(--color-muted);
}

.capabilities_section h2 {
    margin-bottom: 36px;
}

.capability_list,
.ios_feature_list {
    column-gap: 56px;
    columns: 2;
    list-style: none;
    margin: 0 auto;
    max-width: 920px;
    padding: 0;
}

.capability_list li,
.ios_feature_list li {
    break-inside: avoid;
    color: var(--color-muted);
    margin: 0 0 12px;
    padding-left: 20px;
    position: relative;
}

.capability_list li::before,
.ios_feature_list li::before {
    color: var(--color-accent);
    content: "•";
    font-weight: 600;
    left: 0;
    position: absolute;
}

.pricing_section .basic_container,
.support_section .basic_container {
    text-align: center;
}

.pricing_section .basic_container {
    padding-bottom: var(--section-space);
}

.ios_section {
    background: #fff;
}

.ios_section .basic_container {
    padding-top: var(--section-space);
}

.centered_actions {
    justify-content: center;
}

.ios-screens {
    display: flex;
    gap: 24px;
    justify-content: center;
    list-style: none;
    margin: 36px 0 42px;
    padding: 0;
}

.ios-screens li {
    margin: 0;
}

.ios-screen {
    border-radius: 12px;
    display: block;
    width: 300px;
}

.compatibility_note {
    background: var(--color-warning-bg);
    border: 1px solid #eadfab;
    border-radius: 10px;
    color: var(--color-warning-text);
    margin: 32px auto 0;
    max-width: 920px;
    padding: 16px 18px;
}

.community_card {
    display: flex;
    flex-direction: column;
    min-height: 210px;
}

.community_card_primary {
    background: #eef8fe;
    border-color: #b9dcf3;
}

.community_card p {
    margin-bottom: 24px;
}

.community_link {
    font-weight: 600;
    margin-top: auto;
    width: fit-content;
}

.github_stars {
    align-items: center;
    align-self: flex-start;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    display: inline-flex;
    font-size: 14px;
    font-weight: 600;
    gap: 7px;
    margin: 0 0 22px;
    padding: 8px 11px;
    text-decoration: none;
}

.github_stars:hover {
    border-color: #b8c2c9;
    color: var(--color-text);
    text-decoration: none;
}

.github_stars_icon {
    color: #e3a008;
    font-size: 17px;
    line-height: 1;
}

.github_stars_count {
    border-left: 1px solid var(--color-border);
    color: var(--color-muted);
    font-variant-numeric: tabular-nums;
    margin-left: 2px;
    padding-left: 9px;
}

.contributors_note {
    color: var(--color-subtle);
    margin: 28px 0 0;
    text-align: center;
}

.support_section p:last-child {
    color: var(--color-muted);
    font-size: 18px;
    margin-bottom: 0;
}

.site_footer {
    border-top: 1px solid var(--color-border);
    margin: 0;
    padding: 56px 24px 40px;
    text-align: center;
}

.site_footer_home {
    padding-bottom: 48px;
    padding-top: 48px;
}

.site_footer h2 {
    font-size: 28px;
}

.footer_store_buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin: 24px 0 34px;
}

.footer_copyright {
    color: var(--color-text);
    font-size: 17px;
    font-weight: 200;
    margin: 0;
}

.content {
    margin: 0 auto;
    max-width: var(--reading-width);
    padding: 0 24px;
    width: 100%;
}

.content > h1 {
    font-size: clamp(38px, 5vw, 58px);
    margin-bottom: 38px;
    text-align: center;
}

.content h2 {
    font-size: 32px;
    margin: 52px 0 18px;
    text-align: left;
}

.content h3 {
    font-size: 23px;
    margin: 38px 0 14px;
}

.content p,
.content li {
    color: #46515b;
    line-height: 1.75;
}

.content img {
    border-radius: 12px;
    cursor: zoom-in;
    display: block;
    margin: 32px auto;
    max-width: 100%;
    width: auto;
}

.content_hero_image {
    margin: 42px 0;
    text-align: center;
}

.content_hero_image img {
    max-width: 600px;
}

.content_image_row {
    align-items: flex-start;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin: 32px 0;
}

.content_image_row img {
    margin: 0;
}

.content img.image_medium {
    width: 300px;
}

.content img.image_icon {
    width: 100px;
}

.content img.image_wide {
    width: 400px;
}

.hero_visual img,
.product_detail img,
.ios-screen {
    cursor: zoom-in;
}

.image_lightbox[hidden] {
    display: none;
}

.image_lightbox {
    align-items: center;
    background: rgba(13, 17, 21, 0.92);
    bottom: 0;
    display: flex;
    justify-content: center;
    left: 0;
    padding: 64px 28px 28px;
    position: fixed;
    right: 0;
    top: 0;
    z-index: 1000;
}

.image_lightbox img {
    border-radius: 8px;
    cursor: zoom-out;
    max-height: calc(100vh - 92px);
    max-width: calc(100vw - 56px);
    object-fit: contain;
}

.image_lightbox_close {
    align-items: center;
    background: rgba(255, 255, 255, 0.12);
    border: 0;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    display: flex;
    font: 32px/1 var(--font-sans);
    height: 44px;
    justify-content: center;
    padding: 0 0 4px;
    position: absolute;
    right: 20px;
    top: 16px;
    width: 44px;
}

.image_lightbox_close:hover,
.image_lightbox_close:focus-visible {
    background: rgba(255, 255, 255, 0.24);
    outline: 2px solid #fff;
    outline-offset: 2px;
}

@media (max-width: 820px) {
    :root {
        --section-space: 52px;
    }

    header {
        display: flex;
        flex-direction: column;
        padding: 26px 20px;
    }

    .language_switcher {
        align-self: center;
        margin: 0 0 32px;
        order: -1;
        position: static;
    }

    .site_brand_text {
        font-size: 43px;
        margin-left: 14px;
    }

    .fsnotes_logo {
        width: 72px;
    }

    .navi {
        gap: 8px 20px;
        margin-top: 24px;
    }

    .hero_inner,
    .split_section {
        gap: 38px;
        grid-template-columns: 1fr;
    }

    .hero_inner {
        padding: 52px 0;
    }

    .hero_copy h1 {
        font-size: 44px;
    }

    .hero_lead,
    .section_intro {
        font-size: 18px;
    }

    .feature_grid,
    .community_grid {
        grid-template-columns: 1fr;
    }

    .feature_card,
    .community_card {
        min-height: 0;
    }

    .capability_list,
    .ios_feature_list {
        columns: 1;
    }

    .split_section h2 {
        text-align: center;
    }

    .split_section .eyebrow {
        text-align: center;
    }
}

@media (max-width: 520px) {
    .navi {
        column-gap: 16px;
    }

    .navi a {
        font-size: 16px;
    }

    .hero {
        padding-left: 20px;
        padding-right: 20px;
    }

    .hero_copy h1 {
        font-size: 39px;
    }

    .hero_actions,
    .footer_store_buttons {
        align-items: flex-start;
        flex-direction: column;
    }

    .centered_actions,
    .footer_store_buttons {
        align-items: center;
    }

    .ios-screens {
        align-items: center;
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        transition: none !important;
    }
}