:root {
    --c-bg: #f7f5f0; /* Warm off-white */
    --c-surface: #ffffff;
    --c-text: #1a1a1a; /* Ink black */
    --c-subtle: #6b7280;
    --c-accent: #e8432a; /* Coral-red */
    --c-accent-dark: #c2341f;
    --c-dark-bg: #1a1a1a;
    --c-dark-text: #ffffff;
    --c-border: #e5e7eb;
    --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    font-size: 16px;
}

a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Top Navigation --- */
.topnav {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--c-border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.brand {
    display: flex;
    align-items: center;
    font-size: 20px;
    font-weight: 600;
}

.brand-icon {
    width: 32px;
    height: 32px;
    margin-right: 12px;
}

.navlist {
    display: flex;
    list-style: none;
    gap: 16px;
}

.navlist a {
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 500;
    color: var(--c-text);
    transition: background-color 0.2s, color 0.2s;
}

.navlist a:hover {
    background-color: rgba(0,0,0,0.05);
    text-decoration: none;
}

.navlist a.on {
    background-color: var(--c-accent);
    color: white;
}

.nav-dl-btn {
    display: none; /* Show on mobile */
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 16px;
    white-space: nowrap;
}

.btn-coral {
    background-color: var(--c-accent);
    color: white;
    border-color: var(--c-accent);
}
.btn-coral:hover {
    background-color: var(--c-accent-dark);
    border-color: var(--c-accent-dark);
}

.btn-dark {
    background-color: var(--c-text);
    color: white;
}
.btn-dark:hover { background-color: #333; }

.btn-outline-w {
    background-color: transparent;
    color: white;
    border-color: white;
}
.btn-outline-w:hover { background-color: rgba(255,255,255,0.1); }

.btn-ghost {
    background-color: transparent;
    color: var(--c-text);
    border-color: var(--c-border);
}
.btn-ghost:hover { background-color: rgba(0,0,0,0.05); }

.btn-lg { padding: 14px 28px; font-size: 18px; }
.btn-sm { padding: 6px 12px; font-size: 14px; }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* --- Section Base --- */
.sec {
    padding: 80px 0;
}
.sec-alt { background-color: var(--c-surface); }
.sec-surface { background-color: var(--c-surface); border-radius: 24px; padding: 60px; }

.sec-hd {
    text-align: center;
    margin-bottom: 60px;
}

.eyebrow {
    font-size: 16px;
    font-weight: 600;
    color: var(--c-accent);
    margin-bottom: 8px;
    text-transform: uppercase;
}

.sec-hd .sec-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.sec-hd .sec-sub {
    font-size: 18px;
    color: var(--c-subtle);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Hero Section --- */
.hero {
    padding: 80px 0;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text .hero-label {
    display: inline-block;
    padding: 4px 12px;
    background-color: #ffebe8; /* Light coral */
    color: var(--c-accent);
    font-weight: 600;
    border-radius: 99px;
    margin-bottom: 16px;
}

.hero-text .hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text .hero-sub {
    font-size: 18px;
    color: var(--c-subtle);
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 32px;
    border-top: 1px solid var(--c-border);
    padding-top: 24px;
}

.hero-stats .stat-val { font-size: 24px; font-weight: 700; }
.hero-stats .stat-lbl { font-size: 14px; color: var(--c-subtle); }

.hero-visual {
    position: relative;
    perspective: 1000px;
    min-height: 320px;
}

.doc-card {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.07);
    padding: 16px;
    border: 1px solid var(--c-border);
    position: absolute;
}

.doc-card img, .doc-card svg { max-width: 100%; border-radius: 6px; display: block; }

.doc-card:nth-child(1) { width: 80%; transform: rotateX(6deg) rotateY(-12deg) rotateZ(-3deg); z-index: 3; top: 0; left: 0; }
.doc-card:nth-child(2) { width: 70%; transform: rotateX(4deg) rotateY(10deg) rotateZ(6deg); z-index: 2; top: 60px; right: 0; }
.doc-card:nth-child(3) { width: 60%; transform: rotateX(0deg) rotateY(-5deg) rotateZ(3deg); z-index: 1; bottom: 0; left: 30px; }

/* --- Bento Grid --- */
.bento {
    display: grid;
    gap: 24px;
}

.bento-4 { grid-template-columns: repeat(4, 1fr); }
.bento-3 { grid-template-columns: repeat(3, 1fr); }
.bento-2 { grid-template-columns: repeat(2, 1fr); }

.bcard {
    background-color: var(--c-surface);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--c-border);
    transition: transform 0.2s, box-shadow 0.2s;
}

.bcard:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(0,0,0,0.06); }

.bcard.span2 { grid-column: span 2; }
.bcard.accent { background-color: var(--c-accent); color: white; }
.bcard.dark { background-color: var(--c-dark-bg); color: white; }

.bcard-icon { margin-bottom: 16px; width: 40px; height: 40px; color: var(--c-accent); }
.bcard.accent .bcard-icon, .bcard.dark .bcard-icon { color: white; }

.bcard-title { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.bcard-desc { font-size: 15px; opacity: 0.8; }
.bcard-num { font-size: 48px; font-weight: 700; line-height: 1; }

/* --- Platform Strip --- */
.plat-strip { padding: 60px 0; background-color: var(--c-dark-bg); color: white; }
.plat-strip .sec-title, .plat-strip .sec-sub, .plat-strip .plat-name, .plat-strip .plat-ver { color: white; }
.plat-strip .plat-ver { opacity: 0.7; }
.plat-strip .btn-ghost { color: white; border-color: rgba(255,255,255,0.4); }
.plat-strip .btn-ghost:hover { background-color: rgba(255,255,255,0.1); }
.plat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.plat-card {
    background-color: #2a2a2a;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    border: 1px solid #444;
}

.plat-card.featured { border-color: var(--c-accent); }
.plat-ico { width: 48px; height: 48px; margin: 0 auto 16px; }
.plat-name { font-size: 18px; font-weight: 600; margin-bottom: 4px; }
.plat-ver { font-size: 14px; opacity: 0.7; margin-bottom: 16px; }

/* --- Feature Row (frow) --- */
.frow {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.frow.rev .frow-info { order: 2; }
.frow.rev .frow-visual { order: 1; }

.frow-badge { font-weight: 600; color: var(--c-accent); margin-bottom: 12px; }
.frow-title { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
.frow-desc { color: var(--c-subtle); margin-bottom: 24px; }
.frow-visual { background-color: var(--c-surface); border-radius: 16px; padding: 24px; border: 1px solid var(--c-border); }
.frow-visual img { max-width: 100%; border-radius: 8px; }

/* --- Reviews Grid --- */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.rev-card {
    background-color: var(--c-surface);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--c-border);
}

.rev-card .rev-stars { margin-bottom: 16px; color: #f59e0b; }
.rev-card .rev-text { margin-bottom: 20px; font-style: italic; }
.rev-card .rev-author {
    display: flex;
    align-items: center;
}
.rev-avatar { width: 40px; height: 40px; border-radius: 50%; margin-right: 12px; }
.rev-name { font-weight: 600; }
.rev-role { font-size: 14px; color: var(--c-subtle); }

/* --- Comparison Table --- */
.cmp-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--c-surface);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--c-border);
}

.cmp-table th, .cmp-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--c-border);
}

.cmp-table thead th {
    background-color: #f9fafb;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
}

.cmp-table tbody tr:last-child td { border-bottom: none; }
.cmp-table tbody td:first-child { font-weight: 600; }
.cmp-table .hl { color: var(--c-accent); font-weight: 700; }
.cmp-table .check-icon { color: #22c55e; width: 20px; height: 20px; }
.cmp-table .cross-icon { color: #ef4444; width: 20px; height: 20px; }

/* --- FAQ --- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background-color: var(--c-surface);
    border-radius: 12px;
    border: 1px solid var(--c-border);
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-q {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: 18px;
}

.faq-chevron { transition: transform 0.3s; width: 24px; height: 24px; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }

.faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    padding: 0 20px;
}

.faq-item.open .faq-a { padding-bottom: 20px; }

/* --- CTA Banner --- */
.cta-banner {
    background: linear-gradient(45deg, var(--c-accent), #f97316);
    color: white;
    padding: 60px;
    border-radius: 24px;
    text-align: center;
}

.cta-banner .cta-title { font-size: 32px; font-weight: 700; margin-bottom: 24px; }

/* --- Footer --- */
.site-footer {
    padding: 60px 0;
    border-top: 1px solid var(--c-border);
    color: var(--c-subtle);
    font-size: 14px;
    text-align: center;
}

.footer-brand {
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 600;
    gap: 12px;
}
.security-line { font-weight: 600; color: var(--c-text); margin-bottom: 8px; }
.footer-note { max-width: 600px; margin: 0 auto; }

/* --- Download Page Specific --- */
.dl-hero { text-align: center; padding: 80px 0; }
.dl-hero .hero-title { font-size: 42px; }
.dl-hero .hero-sub { max-width: 700px; }

.win-box {
    background-color: var(--c-surface);
    border: 2px solid var(--c-accent);
    border-radius: 16px;
    padding: 40px;
    max-width: 800px;
    margin: 0 auto 60px;
    box-shadow: 0 10px 30px rgba(232, 67, 42, 0.1);
}

.win-box .plat-ico { width: 64px; height: 64px; }
.win-box .plat-name { font-size: 24px; }
.win-specs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 32px;
    text-align: left;
    color: var(--c-subtle);
    font-size: 14px;
}

.win-spec strong { color: var(--c-text); display: block; font-weight: 600;}

.other-plats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.op-card { background-color: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 24px; text-align: center; }

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.gstep {
    display: flex;
    gap: 16px;
}

.gstep-num {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--c-accent);
    color: white;
    display: grid;
    place-items: center;
    font-weight: 700;
    font-size: 18px;
}

.gstep-title { font-weight: 600; margin-bottom: 4px; }
.gstep-desc { font-size: 15px; color: var(--c-subtle); }

.req-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.req-card { background-color: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 24px; text-align: center; }
.req-ico { width: 40px; height: 40px; margin: 0 auto 12px; color: var(--c-accent); }
.req-card .req-title { font-weight: 600; }

.ver-timeline {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}
.ver-timeline::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--c-border);
}

.ver-item {
    position: relative;
    padding-left: 40px;
    margin-bottom: 32px;
}

.ver-dot {
    position: absolute;
    left: 0;
    top: 5px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--c-bg);
    border: 6px solid var(--c-accent);
}

.ver-tag { display: inline-block; background-color: #e0e7ff; color: #4f46e5; padding: 2px 8px; border-radius: 6px; font-size: 12px; font-weight: 600; margin-right: 8px; }
.ver-date { font-size: 14px; color: var(--c-subtle); }
.ver-body { margin-top: 8px; }

/* --- ZH-CN Page Specific --- */
.article-hero { text-align: center; padding: 60px 0; }
.kw-strip {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.kw { background-color: #e5e7eb; padding: 6px 14px; border-radius: 99px; font-size: 14px; font-weight: 500; }

.article-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 60px;
    align-items: flex-start;
}

.article-body h2 { font-size: 28px; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid var(--c-border); padding-bottom: 8px; }
.article-body h3 { font-size: 22px; margin-top: 32px; margin-bottom: 16px; }
.article-body p, .article-body ul { margin-bottom: 16px; }
.article-body ul { padding-left: 20px; }

.inline-cta { background-color: #fffbeb; border: 1px solid #fde68a; border-radius: 12px; padding: 24px; margin: 32px 0; text-align: center; }
.inline-cta .cta-title { font-size: 20px; font-weight: 600; margin-bottom: 16px; }

.sidebar { position: sticky; top: 88px; }
.sbox { background-color: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 24px; margin-bottom: 24px; }
.sbox-title { font-size: 18px; font-weight: 600; margin-bottom: 16px; border-bottom: 1px solid var(--c-border); padding-bottom: 12px; }
.stoc ul { list-style: none; padding-left: 0; }
.stoc a { display: block; padding: 6px 0; color: var(--c-subtle); font-weight: 500; }
.stoc a:hover { color: var(--c-accent); }

.sstat-item { margin-bottom: 12px; }
.sstat-num { font-weight: 700; font-size: 20px; }

.cta-box .btn { width: 100%; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; text-align: center; }
    .hero-visual { display: none; } /* Hide complex visual on smaller screens */
    .hero-actions, .hero-stats { justify-content: center; }
    .bento-4 { grid-template-columns: repeat(2, 1fr); }
    .plat-grid { grid-template-columns: repeat(2, 1fr); }
    .frow { grid-template-columns: 1fr; }
    .frow.rev .frow-info, .frow.rev .frow-visual { order: 0; }
    .reviews-grid { grid-template-columns: 1fr; }
    .other-plats { grid-template-columns: 1fr; }
    .article-layout { grid-template-columns: 1fr; }
    .sidebar { position: static; }
}

@media (max-width: 768px) {
    .navlist { display: none; }
    .nav-dl-btn { display: inline-flex; }
    .sec { padding: 60px 0; }
    .sec-hd .sec-title { font-size: 30px; }
    .hero-text .hero-title { font-size: 36px; }
    .bento-4, .bento-3, .bento-2 { grid-template-columns: 1fr; }
    .bcard.span2 { grid-column: span 1; }
    .plat-grid { grid-template-columns: 1fr; }
}