:root {
    color-scheme: light;
    --ink: #18201f;
    --muted: #62706d;
    --line: #dfe6e3;
    --surface: #ffffff;
    --surface-soft: #f4f7f5;
    --canvas: #eef3f0;
    --teal: #087f72;
    --teal-dark: #086359;
    --blue: #285da8;
    --coral: #c95433;
    --gold: #9a7014;
    --shadow-sm: 0 1px 2px rgba(24, 32, 31, 0.05);
    --shadow-md: 0 12px 32px rgba(24, 32, 31, 0.09);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 88px;
}

body {
    margin: 0;
    background: var(--canvas);
    color: var(--ink);
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.55;
}

button,
input {
    font: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

a {
    color: inherit;
}

.shell {
    width: min(100% - 48px, 1440px);
    margin-inline: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid rgba(207, 217, 213, 0.92);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(14px);
}

.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    gap: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    text-decoration: none;
}

.brand img {
    display: block;
    width: auto;
    height: 42px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-right: auto;
}

.main-nav a {
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    padding: 0 11px;
    border-radius: 5px;
    color: #44514f;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
}

.main-nav a:hover,
.main-nav a:focus-visible {
    background: var(--surface-soft);
    color: var(--teal-dark);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.language-switch {
    height: 38px;
    display: inline-grid;
    grid-template-columns: 1fr 1fr;
    padding: 3px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface-soft);
}

.language-switch button {
    min-width: 48px;
    border: 0;
    border-radius: 4px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 13px;
    font-weight: 700;
}

.language-switch button[aria-pressed="true"] {
    background: var(--surface);
    color: var(--ink);
    box-shadow: var(--shadow-sm);
}

.icon-button {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface);
    color: #4c5956;
    text-decoration: none;
}

.icon-button:hover,
.icon-button:focus-visible {
    border-color: #aab8b3;
    color: var(--teal-dark);
}

.hero {
    position: relative;
    overflow: hidden;
    padding: 66px 0 54px;
    border-bottom: 1px solid #d8e1dd;
    background-color: #f8faf9;
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.78fr);
    align-items: center;
    gap: 72px;
}

.eyebrow {
    margin: 0 0 15px;
    color: var(--teal-dark);
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
}

.hero h1 {
    max-width: 750px;
    margin: 0;
    font-size: 54px;
    line-height: 1.08;
    letter-spacing: 0;
}

.hero-copy {
    max-width: 700px;
    margin: 20px 0 0;
    color: #53615e;
    font-size: 18px;
}

.search-wrap {
    margin-top: 30px;
}

.search-box {
    min-height: 56px;
    display: grid;
    grid-template-columns: 24px 1fr;
    align-items: center;
    gap: 12px;
    max-width: 680px;
    padding: 0 14px 0 18px;
    border: 1px solid #cbd6d2;
    border-radius: 7px;
    background: var(--surface);
    box-shadow: 0 8px 24px rgba(24, 32, 31, 0.08);
}

.search-box:focus-within {
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(8, 127, 114, 0.13), 0 8px 24px rgba(24, 32, 31, 0.08);
}

.search-box > i {
    color: #75817f;
}

.search-box input {
    min-width: 0;
    height: 52px;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--ink);
}

.search-box input::placeholder {
    color: #84908e;
}

.hero-panel {
    align-self: stretch;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-content: center;
    gap: 12px;
}

.metric {
    min-height: 116px;
    padding: 22px;
    border: 1px solid #d7e0dc;
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.88);
}

.metric:nth-child(1) {
    border-top: 4px solid var(--teal);
}

.metric:nth-child(2) {
    border-top: 4px solid var(--blue);
}

.metric:nth-child(3) {
    border-top: 4px solid var(--coral);
}

.metric:nth-child(4) {
    border-top: 4px solid var(--gold);
}

.metric strong {
    display: block;
    font-size: 28px;
    line-height: 1.1;
}

.metric span {
    display: block;
    margin-top: 8px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
}

.catalog {
    padding: 30px 0 76px;
}

.filter-bar {
    position: sticky;
    top: 70px;
    z-index: 40;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 22px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(12px);
}

.filter-bar button {
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 14px;
    border: 1px solid transparent;
    border-radius: 5px;
    background: transparent;
    color: #53615e;
    cursor: pointer;
    font-size: 14px;
    font-weight: 700;
}

.filter-bar button:hover {
    background: var(--surface-soft);
}

.filter-bar button[aria-pressed="true"] {
    border-color: #c7d6d1;
    background: #e6f1ee;
    color: var(--teal-dark);
}

.filter-count {
    min-width: 24px;
    padding: 1px 6px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.72);
    color: inherit;
    font-size: 11px;
    text-align: center;
}

.content-section {
    margin-top: 54px;
}

.content-section:first-of-type {
    margin-top: 0;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 20px;
}

.section-kicker {
    margin: 0 0 6px;
    color: var(--teal-dark);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.section-heading h2,
.faq-intro h2 {
    margin: 0;
    font-size: 29px;
    line-height: 1.2;
    letter-spacing: 0;
}

.section-description {
    max-width: 590px;
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    text-align: right;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: var(--line);
    box-shadow: var(--shadow-sm);
}

.tool-card {
    --card-accent: var(--teal);
    --card-soft: #edf6f3;
    --card-icon-border: #c9ddd8;
    min-height: 292px;
    display: flex;
    align-items: center;
    flex-direction: column;
    padding: 30px 20px 26px;
    border: 0;
    border-radius: 0;
    background: var(--surface);
    color: inherit;
    text-align: center;
    text-decoration: none;
    box-shadow: none;
    transition: background 180ms ease, box-shadow 180ms ease;
}

.tool-card:nth-child(4n + 2) {
    --card-accent: var(--blue);
    --card-soft: #edf2f9;
    --card-icon-border: #cad8ea;
}

.tool-card:nth-child(4n + 3) {
    --card-accent: var(--coral);
    --card-soft: #f9eee9;
    --card-icon-border: #ebd0c5;
}

.tool-card:nth-child(4n + 4) {
    --card-accent: var(--gold);
    --card-soft: #faf3e3;
    --card-icon-border: #e7d9b5;
}

.tool-card:hover {
    background: var(--card-soft);
    box-shadow: inset 0 0 0 2px var(--card-accent);
}

.tool-card:focus-visible,
.convert-card:focus-visible,
.feature-card:focus-visible,
.faq-question:focus-visible,
button:focus-visible,
a:focus-visible {
    outline: 3px solid rgba(8, 127, 114, 0.24);
    outline-offset: 2px;
}

.card-top {
    position: relative;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
}

.tool-icon {
    width: 104px;
    height: 104px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--card-icon-border);
    border-radius: 7px;
    background: var(--card-soft);
    color: var(--card-accent);
    flex: 0 0 auto;
    transition: transform 180ms ease, background 180ms ease;
}

.tool-icon i {
    font-size: 42px;
}

.tool-icon-img,
.tool-icon-svg {
    width: 70px;
    height: 70px;
    object-fit: contain;
}

.tool-icon-svg {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.tool-icon-svg svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
    color: currentColor;
}

.tool-card:hover .tool-icon {
    transform: translateY(-3px) scale(1.04);
}

.card-arrow {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    background: var(--surface-soft);
    color: #6c7875;
    font-size: 12px;
    transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.tool-card .card-arrow {
    position: absolute;
    top: 0;
    right: 0;
    opacity: 0.45;
}

.tool-card:hover .card-arrow {
    transform: translate(2px, -2px);
    background: var(--card-accent);
    color: #fff;
    opacity: 1;
}

.feature-card:hover .card-arrow {
    transform: translate(2px, -2px);
    background: var(--teal);
    color: #fff;
}

.card-category {
    display: none;
}

.tool-card h3 {
    margin: 19px 0 0;
    font-size: 20px;
    line-height: 1.3;
    letter-spacing: 0;
}

.tool-card p {
    margin: 10px 0 0;
    max-width: 260px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.55;
}

.convert-band {
    padding: 28px;
    border: 1px solid #d7e1dd;
    border-left: 5px solid var(--blue);
    border-radius: 7px;
    background: #f8faf9;
}

.convert-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
}

.convert-card {
    min-height: 72px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface);
    color: inherit;
    text-decoration: none;
    transition: border-color 180ms ease, transform 180ms ease;
}

.convert-card:hover {
    transform: translateY(-2px);
    border-color: #92accf;
}

.convert-icon {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 5px;
    background: #edf2f9;
    color: var(--blue);
    flex: 0 0 auto;
}

.convert-icon i {
    font-size: 18px;
}

.convert-icon .tool-icon-img,
.convert-icon .tool-icon-svg {
    width: 23px;
    height: 23px;
}

.convert-title {
    min-width: 0;
    overflow-wrap: anywhere;
    font-size: 13px;
    font-weight: 750;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.feature-card {
    min-height: 154px;
    display: grid;
    grid-template-columns: 46px minmax(0, 1fr) 30px;
    align-content: start;
    gap: 14px;
    padding: 21px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: var(--surface);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
    transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    border-color: #d0a18f;
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 46px;
    height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    background: #f8eee9;
    font-size: 23px;
}

.feature-content {
    min-width: 0;
}

.feature-content h3 {
    margin: 2px 0 8px;
    font-size: 17px;
    line-height: 1.35;
    letter-spacing: 0;
}

.feature-content p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.55;
}

.feature-card .card-arrow {
    align-self: start;
}

.faq-layout {
    display: grid;
    grid-template-columns: 0.42fr 1fr;
    gap: 56px;
    padding-top: 8px;
}

.faq-intro {
    position: sticky;
    top: 148px;
    align-self: start;
}

.faq-intro p:last-child {
    margin: 14px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.faq-list {
    border-top: 1px solid #cfd9d5;
}

.faq-item {
    border-bottom: 1px solid #cfd9d5;
}

.faq-question {
    width: 100%;
    min-height: 70px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 24px;
    align-items: center;
    gap: 16px;
    padding: 14px 4px;
    border: 0;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
    font-size: 16px;
    font-weight: 750;
    text-align: left;
}

.faq-question i {
    color: var(--teal-dark);
    font-size: 13px;
    transition: transform 180ms ease;
}

.faq-question[aria-expanded="true"] i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 40px 22px 4px;
    color: var(--muted);
    font-size: 14px;
}

.faq-answer[hidden] {
    display: none;
}

.empty-state {
    padding: 52px 24px;
    border: 1px dashed #afbeb9;
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.58);
    color: var(--muted);
    text-align: center;
}

.empty-state i {
    display: block;
    margin-bottom: 12px;
    color: #84928e;
    font-size: 24px;
}

.site-footer {
    padding: 30px 0;
    border-top: 1px solid #d8e1dd;
    background: #19211f;
    color: #d9e0dd;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.footer-brand {
    font-size: 15px;
    font-weight: 750;
}

.footer-copy {
    margin: 4px 0 0;
    color: #9caaa6;
    font-size: 12px;
}

.footer-link {
    color: #d9e0dd;
    font-size: 13px;
    text-decoration: none;
}

.footer-link:hover {
    color: #fff;
}

[hidden] {
    display: none !important;
}

@media (max-width: 1180px) {
    .hero-inner {
        gap: 42px;
    }

    .hero h1 {
        font-size: 46px;
    }

    .tools-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .convert-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

@media (max-width: 900px) {
    .shell {
        width: min(100% - 36px, 1440px);
    }

    .main-nav {
        display: none;
    }

    .header-actions {
        margin-left: auto;
    }

    .hero {
        padding: 48px 0 42px;
    }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .hero-panel {
        grid-template-columns: repeat(4, 1fr);
    }

    .metric {
        min-height: 92px;
        padding: 16px;
    }

    .metric strong {
        font-size: 23px;
    }

    .tools-grid,
    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .convert-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .faq-layout {
        grid-template-columns: 1fr;
        gap: 22px;
    }

    .faq-intro {
        position: static;
    }
}

@media (max-width: 680px) {
    .shell {
        width: min(100% - 28px, 1440px);
    }

    .header-inner {
        min-height: 62px;
        gap: 12px;
    }

    .brand img {
        height: 34px;
    }

    .language-switch {
        height: 36px;
    }

    .language-switch button {
        min-width: 43px;
        font-size: 12px;
    }

    .icon-button {
        width: 36px;
        height: 36px;
    }

    .hero {
        padding: 38px 0 34px;
    }

    .hero h1 {
        font-size: 38px;
    }

    .hero-copy {
        margin-top: 15px;
        font-size: 16px;
    }

    .search-wrap {
        margin-top: 24px;
    }

    .hero-panel {
        grid-template-columns: repeat(2, 1fr);
    }

    .filter-bar {
        top: 62px;
        overflow-x: auto;
        margin-inline: -14px;
        padding-inline: 14px;
        border-right: 0;
        border-left: 0;
        border-radius: 0;
        scrollbar-width: none;
    }

    .filter-bar::-webkit-scrollbar {
        display: none;
    }

    .filter-bar button {
        flex: 0 0 auto;
    }

    .section-heading {
        display: block;
    }

    .section-heading h2,
    .faq-intro h2 {
        font-size: 25px;
    }

    .section-description {
        margin-top: 9px;
        text-align: left;
    }

    .tools-grid,
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .tool-card {
        min-height: 268px;
        padding: 26px 18px 23px;
    }

    .tool-icon {
        width: 92px;
        height: 92px;
    }

    .tool-icon-img,
    .tool-icon-svg {
        width: 62px;
        height: 62px;
    }

    .tool-card h3 {
        font-size: 19px;
    }

    .convert-band {
        padding: 18px;
    }

    .convert-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-inner {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 400px) {
    .brand img {
        height: 30px;
    }

    .header-actions {
        gap: 6px;
    }

    .language-switch button {
        min-width: 38px;
    }

    .hero h1 {
        font-size: 34px;
    }

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

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

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }
}