:root {
    --color-primary: #1a73e8;
    --color-primary-strong: #185abc;
    --color-primary-soft: #e8f0fe;
    --color-accent: #34a853;
    --color-text: #202124;
    --color-muted: #5f6368;
    --color-border: #d7def1;
    --color-surface: #ffffff;
    --color-surface-alt: #f7fafe;
    --color-surface-strong: #eef4ff;
    --shadow-soft: 0 10px 30px rgba(17, 34, 68, 0.08);
    --shadow-card: 0 12px 28px rgba(26, 115, 232, 0.12), 0 2px 6px rgba(17, 34, 68, 0.08);
    --shadow-hover: 0 18px 44px rgba(26, 115, 232, 0.16), 0 6px 16px rgba(17, 34, 68, 0.1);
    --radius-sm: 14px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-pill: 999px;
    --container: min(1120px, calc(100vw - 2rem));
    --article: min(800px, calc(100vw - 2rem));
    --transition: 240ms cubic-bezier(0.2, 0, 0, 1);
    --header-height: 72px;
    --font-body: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--color-text);
    background:
        radial-gradient(circle at top left, rgba(26, 115, 232, 0.12), transparent 36%),
        linear-gradient(180deg, #fcfeff 0%, #f5f9ff 48%, #ffffff 100%);
    line-height: 1.65;
    min-width: 320px;
}

body.nav-open {
    overflow: hidden;
}

body.is-ready .reveal {
    opacity: 1;
    transform: translateY(0);
}

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

img,
svg {
    display: block;
    max-width: 100%;
}

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

button,
input,
textarea,
select {
    font: inherit;
}

button {
    border: 0;
    background: none;
    cursor: pointer;
}

ul,
ol {
    margin: 0;
    padding: 0;
}

p,
h1,
h2,
h3,
h4 {
    margin: 0;
}

::selection {
    background: rgba(26, 115, 232, 0.18);
}

.container {
    width: var(--container);
    margin: 0 auto;
}

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

.section-alt {
    background: linear-gradient(180deg, rgba(232, 240, 254, 0.72), rgba(255, 255, 255, 0.9));
}

.surface-card,
.card,
.step-card,
.faq-item,
.article-content,
.redirect-card {
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(215, 222, 241, 0.92);
    box-shadow: var(--shadow-card);
    border-radius: var(--radius-lg);
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    border-radius: var(--radius-pill);
    background: rgba(232, 240, 254, 0.9);
    color: var(--color-primary-strong);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.eyebrow::before {
    content: "";
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 0 5px rgba(52, 168, 83, 0.12);
}

.section-heading {
    max-width: 720px;
    margin: 0 auto 2rem;
    text-align: center;
}

.section-heading h2 {
    font-size: clamp(1.9rem, 4vw, 3rem);
    line-height: 1.15;
    margin-top: 1rem;
}

.section-heading p {
    margin-top: 1rem;
    color: var(--color-muted);
    font-size: 1.05rem;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.86);
    border-bottom: 1px solid rgba(215, 222, 241, 0.7);
    backdrop-filter: blur(18px);
}

.nav-shell {
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    position: relative;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
    min-width: 0;
}

.brand-mark {
    width: 46px;
    height: 46px;
    padding: 0.55rem;
    flex-shrink: 0;
    border-radius: 16px;
    background: linear-gradient(135deg, #1a73e8 0%, #4c8df5 100%);
    box-shadow: 0 10px 22px rgba(26, 115, 232, 0.28);
    color: #ffffff;
}

.brand-text {
    display: grid;
    gap: 0.1rem;
}

.brand-text strong {
    font-size: 1rem;
    line-height: 1.15;
}

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

.site-nav {
    margin-left: auto;
}

.nav-toggle {
    width: 46px;
    height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    border-radius: 15px;
    color: var(--color-text);
    background: rgba(232, 240, 254, 0.72);
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

.nav-toggle:hover {
    background: rgba(26, 115, 232, 0.1);
    color: var(--color-primary-strong);
}

.nav-toggle:active {
    transform: scale(0.96);
}

.nav-toggle .icon-close {
    display: none;
}

.nav-toggle.is-open .icon-menu {
    display: none;
}

.nav-toggle.is-open .icon-close {
    display: block;
}

.nav-menu {
    list-style: none;
    position: absolute;
    top: calc(100% + 0.8rem);
    right: 0;
    left: 0;
    display: grid;
    gap: 0.45rem;
    padding: 0.75rem;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(215, 222, 241, 0.9);
    box-shadow: var(--shadow-card);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity var(--transition), transform var(--transition), max-height var(--transition);
}

.nav-menu.is-open {
    opacity: 1;
    max-height: 480px;
    pointer-events: auto;
    transform: translateY(0);
}

.nav-menu a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0.9rem 1rem;
    border-radius: 16px;
    color: var(--color-muted);
    font-weight: 600;
    transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
    color: var(--color-primary-strong);
    background: rgba(232, 240, 254, 0.9);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    min-height: 50px;
    padding: 0.95rem 1.35rem;
    border-radius: 18px;
    border: 1px solid transparent;
    font-weight: 700;
    line-height: 1;
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background var(--transition),
        color var(--transition),
        border-color var(--transition);
}

.btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-1px);
}

.btn-primary {
    color: #ffffff;
    background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    box-shadow: 0 12px 24px rgba(26, 115, 232, 0.24);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    box-shadow: 0 18px 32px rgba(26, 115, 232, 0.3);
}

.btn-secondary {
    color: var(--color-primary-strong);
    background: rgba(232, 240, 254, 0.9);
    border-color: rgba(26, 115, 232, 0.15);
}

.btn-ghost {
    color: var(--color-muted);
    border-color: rgba(95, 99, 104, 0.16);
    background: rgba(255, 255, 255, 0.82);
}

.btn-sm {
    min-height: 44px;
    padding: 0.8rem 1.15rem;
    border-radius: 15px;
}

.btn-lg {
    min-height: 56px;
    padding: 1rem 1.45rem;
}

.hero {
    position: relative;
    overflow: hidden;
    padding: clamp(3.75rem, 9vw, 6.8rem) 0 clamp(4rem, 7vw, 6rem);
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 88% 16%, rgba(26, 115, 232, 0.18), transparent 24%),
        radial-gradient(circle at 8% 20%, rgba(52, 168, 83, 0.12), transparent 22%);
    pointer-events: none;
}

.hero-grid {
    position: relative;
    display: grid;
    gap: 1.5rem;
}

.hero-copy,
.hero-panel {
    position: relative;
    z-index: 1;
}

.hero-copy {
    display: grid;
    gap: 1.15rem;
}

.hero-copy h1 {
    font-size: clamp(2.2rem, 7vw, 4.3rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
}

.hero-copy p {
    font-size: 1.05rem;
    color: var(--color-muted);
    max-width: 62ch;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding-top: 0.5rem;
}

.platform-actions-center {
    justify-content: center;
}

.hero-points {
    list-style: none;
    display: grid;
    gap: 0.9rem;
    margin-top: 0.5rem;
}

.hero-points li {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    color: var(--color-muted);
}

.hero-points svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    color: var(--color-accent);
}

.hero-panel {
    padding: 1.45rem;
}

.hero-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.hero-panel-header h2 {
    font-size: 1.2rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 34px;
    padding: 0.45rem 0.8rem;
    border-radius: var(--radius-pill);
    color: var(--color-primary-strong);
    background: rgba(232, 240, 254, 0.85);
    font-size: 0.88rem;
    font-weight: 700;
}

.badge svg {
    width: 16px;
    height: 16px;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem;
}

.stat-card {
    padding: 1rem;
    border-radius: 20px;
    background: linear-gradient(180deg, rgba(247, 250, 255, 0.98), rgba(255, 255, 255, 0.98));
    border: 1px solid rgba(215, 222, 241, 0.95);
}

.stat-card strong {
    display: block;
    font-size: 1.45rem;
    line-height: 1.1;
    color: var(--color-primary-strong);
}

.stat-card span {
    display: block;
    margin-top: 0.45rem;
    color: var(--color-muted);
    font-size: 0.92rem;
}

.panel-list {
    list-style: none;
    display: grid;
    gap: 0.9rem;
    margin-top: 1rem;
}

.panel-list li {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 0.85rem;
    align-items: start;
    padding: 0.95rem;
    border-radius: 20px;
    background: rgba(247, 250, 255, 0.9);
    border: 1px solid rgba(215, 222, 241, 0.85);
}

.panel-list svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
    margin: auto;
}

.panel-list strong {
    display: block;
    margin-bottom: 0.25rem;
}

.panel-list span {
    color: var(--color-muted);
    font-size: 0.95rem;
}

.platform-strip {
    padding-top: 0;
}

.platform-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem;
}

.platform-list li {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(215, 222, 241, 0.92);
    box-shadow: var(--shadow-soft);
    color: var(--color-muted);
    font-weight: 700;
}

.platform-list svg {
    width: 18px;
    height: 18px;
    color: var(--color-primary);
}

.feature-grid,
.steps-grid,
.footer-grid {
    display: grid;
    gap: 1rem;
}

.blog-list {
    display: grid;
    gap: 1rem;
}

.blog-card {
    padding: 1.4rem;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.blog-card:hover,
.blog-card:focus-within {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(26, 115, 232, 0.22);
}

.blog-card h2 {
    margin-top: 0.65rem;
    font-size: 1.35rem;
    line-height: 1.3;
}

.blog-card p {
    margin-top: 0.8rem;
    color: var(--color-muted);
}

.blog-card .btn {
    margin-top: 1rem;
}

.card-meta {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-pill);
    background: rgba(232, 240, 254, 0.9);
    color: var(--color-primary-strong);
    font-weight: 700;
    font-size: 0.88rem;
}

.btn-outline {
    color: var(--color-primary-strong);
    border-color: rgba(26, 115, 232, 0.2);
    background: rgba(232, 240, 254, 0.45);
}

.btn-outline:hover,
.btn-outline:focus-visible {
    background: rgba(232, 240, 254, 0.9);
}

.feature-card,
.step-card {
    padding: 1.5rem;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover,
.feature-card:focus-within,
.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(26, 115, 232, 0.22);
}

.feature-icon,
.step-icon {
    width: 56px;
    height: 56px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.9rem;
    border-radius: 18px;
    background: rgba(232, 240, 254, 0.95);
    color: var(--color-primary);
}

.feature-icon svg,
.step-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3,
.step-card h3 {
    margin-top: 1rem;
    font-size: 1.28rem;
}

.feature-card p,
.step-card p {
    margin-top: 0.75rem;
    color: var(--color-muted);
}

.feature-list,
.step-list {
    list-style: none;
    display: grid;
    gap: 0.65rem;
    margin-top: 1rem;
}

.feature-list li,
.step-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    color: var(--color-muted);
}

.feature-list svg,
.step-list svg {
    width: 18px;
    height: 18px;
    color: var(--color-accent);
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.faq-shell {
    max-width: 860px;
}

.faq-group {
    display: grid;
    gap: 1rem;
}

.faq-item {
    overflow: clip;
}

.faq-item summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.35rem;
    cursor: pointer;
    font-weight: 700;
}

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

.faq-item summary svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
    transition: transform var(--transition);
}

.faq-item[open] summary svg {
    transform: rotate(180deg);
}

.faq-item p {
    padding: 0 1.35rem 1.35rem;
    color: var(--color-muted);
}

.cta-banner {
    display: grid;
    gap: 1.25rem;
    padding: clamp(1.5rem, 4vw, 2.5rem);
    border-radius: 30px;
    background: linear-gradient(135deg, #0f5ccc 0%, #4285f4 100%);
    box-shadow: var(--shadow-hover);
    color: #ffffff;
}

.cta-banner h2 {
    font-size: clamp(1.7rem, 4vw, 2.5rem);
    line-height: 1.15;
}

.cta-banner p {
    max-width: 56ch;
    color: rgba(255, 255, 255, 0.88);
}

.cta-banner .btn-secondary {
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.22);
    color: #ffffff;
}

.site-footer {
    padding: 2.5rem 0 1.6rem;
    background: rgba(247, 250, 255, 0.95);
    border-top: 1px solid rgba(215, 222, 241, 0.9);
}

.footer-grid {
    align-items: start;
}

.footer-card {
    padding: 1.35rem;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(215, 222, 241, 0.92);
    box-shadow: var(--shadow-soft);
}

.footer-card h2 {
    font-size: 1rem;
    margin-bottom: 0.9rem;
}

.footer-card p,
.footer-card li,
.footer-card a {
    color: var(--color-muted);
}

.footer-card ul {
    list-style: none;
    display: grid;
    gap: 0.7rem;
}

.footer-card a:hover,
.footer-card a:focus-visible,
.contact-link:hover,
.contact-link:focus-visible {
    color: var(--color-primary-strong);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    align-items: center;
    text-align: center;
    margin-top: 1.6rem;
    color: var(--color-muted);
    font-size: 0.94rem;
}

.contact-link {
    font-weight: 700;
    color: var(--color-primary-strong);
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.55rem;
    color: var(--color-muted);
    font-size: 0.95rem;
}

.breadcrumbs a:hover,
.breadcrumbs a:focus-visible {
    color: var(--color-primary-strong);
}

.article-hero {
    padding: clamp(3.5rem, 8vw, 5rem) 0 1.25rem;
}

.section-tight-top {
    padding-top: 1.5rem;
}

.article-heading {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.article-heading h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.12;
    letter-spacing: -0.03em;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 38px;
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius-pill);
    background: rgba(232, 240, 254, 0.85);
    color: var(--color-primary-strong);
    font-weight: 700;
    font-size: 0.92rem;
}

.article-shell {
    width: var(--article);
    margin: 0 auto;
}

.article-content {
    padding: clamp(1.4rem, 4vw, 2.5rem);
}

.article-content > * + * {
    margin-top: 1.25rem;
}

.article-content .lead {
    font-size: 1.08rem;
    color: var(--color-text);
}

.article-content h2 {
    margin-top: 2.2rem;
    font-size: clamp(1.55rem, 3vw, 2rem);
    line-height: 1.2;
}

.article-content h3 {
    margin-top: 1.55rem;
    font-size: 1.2rem;
    line-height: 1.3;
}

.article-content p,
.article-content li {
    color: #3c4043;
    line-height: 1.8;
}

.article-content ul,
.article-content ol {
    padding-left: 1.3rem;
}

.article-content li + li {
    margin-top: 0.65rem;
}

.article-content blockquote {
    margin: 1.5rem 0 0;
    padding: 1.1rem 1.2rem;
    border-left: 4px solid var(--color-primary);
    border-radius: 0 18px 18px 0;
    background: rgba(232, 240, 254, 0.7);
    color: #3c4043;
}

.article-note,
.inline-cta {
    padding: 1.1rem;
    border-radius: 22px;
    background: rgba(247, 250, 255, 0.95);
    border: 1px solid rgba(215, 222, 241, 0.95);
}

.inline-cta {
    display: grid;
    gap: 1rem;
    margin-top: 1.3rem;
}

.inline-cta strong {
    font-size: 1.08rem;
}

.inline-cta p,
.article-note p {
    color: var(--color-muted);
}

.inline-cta-actions {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.article-note strong {
    display: block;
    margin-bottom: 0.45rem;
}

.download-helper {
    color: var(--color-muted);
    font-size: 0.94rem;
}

.redirect-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 1.5rem;
}

.redirect-card {
    width: min(540px, 100%);
    padding: 1.8rem;
    text-align: center;
}

.redirect-card h1 {
    font-size: clamp(1.8rem, 4vw, 2.4rem);
}

.redirect-card p {
    margin-top: 0.9rem;
    color: var(--color-muted);
}

.loader {
    width: 56px;
    height: 56px;
    margin: 0 auto 1.1rem;
    border-radius: 50%;
    border: 4px solid rgba(26, 115, 232, 0.16);
    border-top-color: var(--color-primary);
    animation: spin 1s linear infinite;
}

.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 480ms cubic-bezier(0.2, 0, 0, 1), transform 480ms cubic-bezier(0.2, 0, 0, 1);
}

.delay-1 {
    transition-delay: 60ms;
}

.delay-2 {
    transition-delay: 120ms;
}

.delay-3 {
    transition-delay: 180ms;
}

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

:focus-visible {
    outline: 3px solid rgba(26, 115, 232, 0.28);
    outline-offset: 3px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (min-width: 640px) {
    .hero-actions,
    .inline-cta-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }

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

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

    .cta-banner {
        grid-template-columns: minmax(0, 1.4fr) auto;
        align-items: center;
    }
}

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .nav-menu,
    .nav-menu.is-open {
        position: static;
        display: flex;
        align-items: center;
        gap: 0.35rem;
        padding: 0;
        margin: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
        opacity: 1;
        max-height: none;
        overflow: visible;
        pointer-events: auto;
        transform: none;
    }

    .nav-menu a {
        min-height: 44px;
        padding: 0.7rem 1rem;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
        align-items: center;
        gap: 2rem;
    }

    .hero-actions {
        flex-direction: row;
        align-items: center;
    }

    .platform-list {
        justify-content: flex-start;
    }

    .footer-grid {
        grid-template-columns: 1.2fr 0.9fr 0.9fr;
    }
}

@media (min-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

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

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

    .hero-panel {
        padding: 1.7rem;
    }

    .cta-banner {
        padding: 2.25rem 2.5rem;
    }
}

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

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}