* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--color-background); color: var(--color-text); font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
.site-header { backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); background: var(--color-toolbar); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 10; }
.site-header-inner { align-items: center; display: flex; height: 44px; justify-content: space-between; margin: 0 auto; max-width: 1080px; padding: 0 24px; }
.brand { align-items: baseline; color: var(--color-text); display: flex; font-size: 17px; gap: 5px; letter-spacing: -0.01em; text-decoration: none; }
.brand-mark { color: var(--color-accent); font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, sans-serif; font-size: 19px; font-weight: 700; letter-spacing: -0.02em; }
.brand-rest { color: var(--color-text-secondary); font-weight: 400; }
.brand:hover .brand-rest { color: var(--color-text); }
.site-footer a { color: var(--color-text-secondary); text-decoration: none; }
.site-footer a:hover, .text-link:hover { color: var(--color-accent); }
.hero { margin: 0 auto; max-width: 800px; padding: 96px 24px 56px; text-align: center; }
.eyebrow { color: var(--color-accent); font-size: 17px; font-weight: 600; margin: 0 0 10px; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(42px, 7vw, 72px); letter-spacing: -0.055em; line-height: 1.04; margin-bottom: 20px; white-space: pre-line; }
.hero-copy { color: var(--color-text-secondary); font-size: clamp(20px, 3vw, 27px); letter-spacing: -0.025em; line-height: 1.28; margin: 0 auto; max-width: 680px; }
.download-actions { display: flex; flex-wrap: wrap; gap: 13px; justify-content: center; margin-top: 32px; }
.button { align-items: center; border-radius: 980px; display: inline-flex; font-size: 17px; gap: 8px; justify-content: center; padding: 13px 22px; text-decoration: none; transition: background .2s ease, transform .2s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { background: var(--color-accent); color: white; }
.button-primary:hover { background: var(--color-accent-hover); }
.button-secondary { color: var(--color-accent); }
.requirements { color: var(--color-text-secondary); font-size: 13px; margin: 17px 0 0; }
.showcase { margin: 0 auto; max-width: 1180px; padding: 0 24px 96px; }
.features { display: grid; gap: 40px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 0 auto; max-width: 1080px; padding: 64px 24px 104px; }
.feature h2 { font-size: 21px; letter-spacing: -0.02em; margin-bottom: 8px; }
.feature p { color: var(--color-text-secondary); font-size: 17px; line-height: 1.47; margin: 0; }
.macbook { margin: 0 auto; max-width: 1080px; }
.macbook-lid { background: #0b0b0d; border-radius: 2.2% 2.2% 0 0 / 3.4% 3.4% 0 0; box-shadow: 0 0 0 1px #3a3a3e, 0 30px 60px var(--color-shadow); margin: 0 auto; padding: 2.1% 2.1% 1.6%; position: relative; width: 88%; }
.macbook-lid::before { background: #0b0b0d; border-radius: 0 0 8px 8px; content: ""; height: 3.2%; left: 50%; position: absolute; top: 2.1%; transform: translateX(-50%); width: 13%; z-index: 1; }
.macbook-screen { align-items: center; aspect-ratio: 16 / 10.35; background: var(--color-desktop); border-radius: 4px; display: flex; justify-content: center; overflow: hidden; }
.macbook-screen img { display: block; filter: drop-shadow(0 12px 28px rgba(0, 0, 0, 0.35)); height: auto; width: 90%; }
.macbook-base { background: linear-gradient(to bottom, #e3e4e6 0%, #c9cbce 55%, #a9abaf 100%); border-radius: 0 0 14px 14px / 0 0 60% 60%; height: 0; margin: 0 auto; padding-bottom: 2.4%; position: relative; width: 100%; }
.macbook-base::before { background: #b5b7ba; border-radius: 0 0 10px 10px; content: ""; height: 45%; left: 50%; position: absolute; top: 0; transform: translateX(-50%); width: 14%; }
.site-footer { align-items: center; color: var(--color-text-secondary); display: flex; font-size: 12px; gap: 18px; justify-content: space-between; margin: 0 auto; max-width: 1080px; padding: 28px 24px 34px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; }
.document-main { margin: 0 auto; max-width: 780px; padding: 72px 24px 96px; }
.document-header { border-bottom: 1px solid var(--color-border); margin-bottom: 42px; padding-bottom: 30px; }
.document-header h1 { font-size: clamp(38px, 6vw, 58px); margin-bottom: 14px; }
.document-updated { color: var(--color-text-secondary); font-size: 14px; margin: 0; }
.document-content { font-size: 17px; line-height: 1.65; }
.document-content h2 { font-size: 25px; letter-spacing: -0.025em; margin: 42px 0 12px; }
.document-content h3 { font-size: 19px; margin: 28px 0 8px; }
.document-content p, .document-content li { color: var(--color-text-secondary); }
.document-content ul, .document-content ol { padding-left: 24px; }
.document-content li + li { margin-top: 8px; }
.document-content strong { color: var(--color-text); }
.document-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 18px; margin-top: 28px; padding: 24px; }
.document-card h2, .document-card h3 { margin-top: 0; }
.text-link { color: var(--color-accent); text-decoration: none; }
.support-grid { display: grid; gap: 16px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 30px; }
.support-grid .document-card { margin: 0; }
.language-landing { margin: 0 auto; max-width: 680px; padding: 20vh 24px 80px; text-align: center; }
.language-landing h1 { font-size: clamp(36px, 6vw, 58px); margin-top: 22px; }
.language-menu { position: relative; }
.language-menu summary { align-items: center; border-radius: 6px; color: var(--color-text-secondary); cursor: pointer; display: flex; font-size: 13px; gap: 5px; list-style: none; padding: 5px 8px; user-select: none; }
.language-menu summary::-webkit-details-marker { display: none; }
.language-menu summary::after { border-bottom: 1.5px solid currentColor; border-right: 1.5px solid currentColor; content: ""; height: 5px; margin-top: -3px; transform: rotate(45deg); transition: transform .2s ease; width: 5px; }
.language-menu[open] summary::after { margin-top: 3px; transform: rotate(-135deg); }
.language-menu summary:hover, .language-menu[open] summary { color: var(--color-text); }
.language-options { background: var(--color-menu); border: 1px solid var(--color-border); border-radius: 10px; box-shadow: 0 10px 30px var(--color-shadow); display: flex; flex-direction: column; min-width: 150px; padding: 5px; position: absolute; right: 0; top: calc(100% + 6px); }
.language-options a { border-radius: 6px; color: var(--color-text); font-size: 14px; padding: 7px 10px 7px 28px; position: relative; text-decoration: none; }
.language-options a:hover { background: var(--color-accent); color: #fff; }
.language-options a[aria-current]::before { content: "✓"; left: 10px; position: absolute; }
@media (max-width: 700px) { .site-header-inner { padding: 0 16px; } .showcase { padding: 0 16px 56px; } .features { gap: 28px; grid-template-columns: 1fr; padding: 8px 20px 64px; }  .hero { padding: 72px 20px; } .site-footer { align-items: flex-start; flex-direction: column; padding: 24px 18px 30px; } .document-main { padding: 48px 20px 72px; } .support-grid { grid-template-columns: 1fr; } }