:root {
  color-scheme: light;
  --ink: #1f2023;
  --line: #ececed;
  --canvas: #ffffff;
  --dot: rgba(28, 31, 35, .105);
  --accent-yellow: #efbf3a;
  --accent-blue: #dff3fb;
  --button: #202124;
  --header-height: 72px;
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; color: var(--ink); background: var(--canvas); font-size: 14px; }
button, a { font: inherit; }
button { cursor: pointer; }
.site-header { height: var(--header-height); width: 100%; display: flex; align-items: center; gap: 38px; padding: 0 clamp(20px, 9.7vw, 204px); background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); position: relative; z-index: 5; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand-symbol { width: 22px; height: 22px; display: inline-flex; align-items: center; justify-content: center; }
.brand-symbol svg { width: 22px; height: 22px; fill: currentColor; }
.brand-name { font-size: 16px; font-weight: 700; letter-spacing: -.02em; }
.main-nav { display: flex; align-items: stretch; height: 100%; gap: clamp(18px, 1.55vw, 32px); }
.nav-link { position: relative; display: inline-flex; align-items: center; gap: 8px; color: #68696d; text-decoration: none; white-space: nowrap; transition: color .18s ease; }
.nav-link:hover, .nav-link.active { color: var(--ink); }
.nav-link.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--ink); border-radius: 2px 2px 0 0; }
.nav-icon { width: 18px; height: 18px; display: inline-flex; }
.nav-icon svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.header-button { width: 20px; height: 28px; padding: 0; display: inline-flex; align-items: center; justify-content: center; border: 0; background: transparent; color: #303136; }
.header-button svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.header-button:hover { color: #000; }
.language-button { font-size: 16px; font-weight: 700; }
.moon-icon { display: none; }
.hero-shell { min-height: calc(100vh - var(--header-height)); position: relative; overflow: hidden; display: flex; justify-content: center; background-color: #fff; background-image: radial-gradient(circle, var(--dot) 1.15px, transparent 1.3px); background-size: 25px 25px; background-position: 1px 4px; }
.hero-shell::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(255,255,255,.76) 0%, rgba(255,255,255,.3) 30%, rgba(255,255,255,.45) 75%, rgba(255,255,255,.83) 100%); pointer-events: none; }
.hero-content { position: relative; z-index: 1; width: min(1040px, calc(100% - 40px)); display: flex; flex-direction: column; align-items: center; text-align: center; padding-top: clamp(86px, 12vh, 150px); }
.eyebrow { margin: 0 0 19px; color: #9b9da1; font-size: 13px; letter-spacing: .16em; }
.hero-title { margin: 0; display: flex; align-items: baseline; justify-content: center; column-gap: clamp(14px, 1.5vw, 28px); font-size: clamp(76px, 7.9vw, 136px); line-height: .98; font-weight: 800; letter-spacing: 0; color: #16171a; transition: column-gap .45s cubic-bezier(.22, 1, .36, 1); }
.hero-title .hero-character { display: inline-block; opacity: 0; transform-origin: 50% 80%; animation: hero-character-enter .9s cubic-bezier(.16, 1, .3, 1) forwards, hero-character-float 5.6s ease-in-out infinite; will-change: transform, opacity, filter; }
.hero-title .hero-character:nth-child(1) { animation-delay: 0s, 1.1s; }
.hero-title .hero-character:nth-child(2) { animation-delay: .1s, 1.25s; }
.hero-title .hero-character:nth-child(3) { animation-delay: .2s, 1.4s; }
.hero-title .hero-character:nth-child(4) { animation-delay: .3s, 1.55s; }
.hero-title .title-muted { color: #6f737a; }
.hero-title:hover { column-gap: clamp(18px, 1.9vw, 36px); }

@keyframes hero-character-enter {
  0% { opacity: 0; transform: translateY(.38em) scale(.88); filter: blur(8px); }
  72% { opacity: 1; transform: translateY(-.045em) scale(1.025); filter: blur(0); }
  100% { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}

@keyframes hero-character-float {
  0%, 100% { opacity: 1; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-5px); }
}
.hero-description { margin: 43px 0 0; color: #777a80; font-size: clamp(16px, 1.2vw, 20px); line-height: 1.8; letter-spacing: .01em; }
.hero-description strong { color: #2b2d31; font-weight: 700; }
.underline-word { position: relative; white-space: nowrap; }
.underline-word::after { content: ""; position: absolute; left: -.06em; right: -.06em; bottom: -.15em; height: 4px; border-radius: 3px; background: var(--accent-yellow); transform: rotate(-1deg); }
.highlight-word { padding: .08em .2em .1em; border-radius: 3px; background: var(--accent-blue); box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.hero-actions { display: flex; align-items: center; gap: 16px; margin-top: 43px; }
.primary-cta, .secondary-cta { height: 54px; border-radius: 10px; padding: 0 26px; display: inline-flex; align-items: center; justify-content: center; font-size: 17px; font-weight: 600; letter-spacing: .01em; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.primary-cta { min-width: 160px; gap: 18px; color: #fff; background: var(--button); border: 1px solid var(--button); box-shadow: 0 8px 20px rgba(24,25,27,.1); }
.primary-cta:hover { background: #000; transform: translateY(-2px); box-shadow: 0 11px 22px rgba(24,25,27,.16); }
.secondary-cta { min-width: 132px; color: #3d3e42; background: rgba(255,255,255,.68); border: 1px solid #dbdcde; }
.secondary-cta:hover { background: #fff; border-color: #aeb0b4; transform: translateY(-2px); }
.arrow { font-size: 24px; font-weight: 400; line-height: 1; margin-top: -2px; }
.hero-hint { display: inline-flex; align-items: center; gap: 8px; margin-top: 25px; color: #adb0b4; font-size: 12px; }
.hint-dot { width: 6px; height: 6px; border-radius: 50%; background: #aeb1b5; }
.canvas-markers { position: absolute; left: 0; right: 0; bottom: 25px; display: flex; justify-content: center; gap: 8px; opacity: .6; }
.canvas-markers span { width: 4px; height: 4px; border-radius: 50%; background: #d2d3d5; }
.toast { position: fixed; z-index: 10; left: 50%; bottom: 32px; transform: translate(-50%, 16px); opacity: 0; pointer-events: none; padding: 11px 16px; border-radius: 8px; color: #fff; background: rgba(28,29,31,.92); box-shadow: 0 8px 24px rgba(0,0,0,.15); transition: opacity .2s ease, transform .2s ease; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
body.dark { --ink: #f5f6f7; --line: #2b2e33; --canvas: #111315; --dot: rgba(255,255,255,.12); --button: #f2f3f4; --accent-blue: #263e48; }
body.dark .site-header { background: rgba(17,19,21,.94); }
body.dark .hero-shell { background-color: #111315; }
body.dark .hero-shell::before { background: linear-gradient(180deg, rgba(17,19,21,.82), rgba(17,19,21,.2) 30%, rgba(17,19,21,.3) 75%, rgba(17,19,21,.88)); }
body.dark .nav-link, body.dark .hero-description, body.dark .hero-hint { color: #a9adb3; }
body.dark .header-button, body.dark .secondary-cta { color: #e5e7ea; }
body.dark .hero-title { color: #f4f5f5; }
body.dark .hero-title .title-muted { color: #9da2aa; }
body.dark .hero-description strong { color: #f1f2f3; }
body.dark .secondary-cta { background: rgba(30,33,37,.75); border-color: #454950; }
body.dark .primary-cta { color: #111315; }
body.dark .sun-icon { display: none; }
body.dark .moon-icon { display: block; }
@media (max-width: 1250px) { .site-header { gap: 24px; padding-left: 28px; padding-right: 28px; } .main-nav { gap: 16px; } .nav-link { font-size: 13px; gap: 5px; } .header-actions { gap: 12px; } }
@media (max-width: 920px) { :root { --header-height: 64px; } .site-header { gap: 15px; padding: 0 18px; } .brand-name { font-size: 15px; } .main-nav { flex: 1; overflow-x: auto; scrollbar-width: none; } .main-nav::-webkit-scrollbar { display: none; } .nav-link { font-size: 12px; } .nav-icon, .nav-icon svg { width: 15px; height: 15px; } .header-actions { gap: 8px; } .hero-content { padding-top: 12vh; } .hero-description { max-width: 690px; margin-top: 30px; } .hero-actions { margin-top: 32px; } }
@media (max-width: 620px) { .site-header { gap: 10px; } .brand-symbol, .brand-symbol svg { width: 19px; height: 19px; } .brand-name { display: none; } .main-nav { gap: 15px; } .nav-link span:last-child { display: none; } .nav-link { min-width: 21px; justify-content: center; } .nav-icon, .nav-icon svg { width: 19px; height: 19px; } .header-actions { margin-left: 0; } .header-actions .header-button:first-child, .header-actions .header-button:nth-child(2) { display: none; } .hero-content { width: calc(100% - 28px); padding-top: 22vh; } .eyebrow { font-size: 11px; letter-spacing: .1em; margin-bottom: 18px; } .hero-title { column-gap: clamp(8px, 2.8vw, 16px); font-size: clamp(55px, 17vw, 90px); } .hero-title:hover { column-gap: clamp(10px, 3.2vw, 19px); } .hero-description { max-width: 440px; margin-top: 28px; font-size: 15px; line-height: 1.9; } .hero-actions { width: 100%; gap: 10px; margin-top: 30px; } .primary-cta, .secondary-cta { flex: 1; min-width: 0; height: 50px; padding: 0 12px; font-size: 15px; } .primary-cta { gap: 11px; } }

@media (prefers-reduced-motion: reduce) {
  .hero-title { transition: none; }
  .hero-title .hero-character { opacity: 1; animation: none; transform: none; filter: none; }
}