:root{--font-body:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--font-display:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--font-mono:"SF Mono","Cascadia Code","Roboto Mono",Consolas,"Liberation Mono",Menlo,monospace;--large-font-weight:900;--secondary-font-weight:400;--medium-font-weight:500;--small-font-weight:300;--x-large-font-size:5rem;--large-font-size:4rem;--medium-font-size:3rem;--small-font-size:2.5rem;--x-small-font-size:2rem;--xx-small-font-size:1.5rem;--normal-font-size:1rem;--content-max-width:1248px;--content-wide-width:1400px;--page-gutter:clamp(1.6rem,4vw,5.6rem);--nav-shell-width:min(104rem,calc(100vw - 2.4rem));--nav-shell-height:62px;--nav-shell-height-scrolled:57px;--nav-control-height:44px;--nav-mobile-height:64px;--radius-control:8px;--radius-card:8px;--radius-panel:10px;--radius-capsule:999px;--surface-blur:22px;--motion-fast:180ms ease;--motion-base:240ms ease;--z-sticky:30;--brand-50:#edf8fc;--brand-100:#d5eef7;--brand-200:#acddea;--brand-300:#76c5da;--brand-400:#3aa7c3;--brand-500:#1283a8;--brand-600:#0b6b8a;--brand-700:#09566f;--brand-800:#0c485b;--brand-900:#103c4b;--success-50:#edf9f3;--success-100:#d4f0e2;--success-200:#abe0c8;--success-300:#75c8a7;--success-400:#42aa84;--success-500:#218f68;--success-600:#0f7a54;--success-700:#0d6245;--success-800:#0e4e39;--success-900:#0c4030;--bg-page:#f4f8fa;--bg-card:#fbfdfe;--bg-elevated:#ffffff;--bg-subtle:#eaf2f5;--bg-hover:#deebf0;--text-primary:#122b35;--text-secondary:#355763;--text-muted:#607984;--text-on-brand:#ffffff;--border-default:#d4e2e7;--border-subtle:#e4edf0;--border-strong:#adc4cd;--interactive-primary:var(--brand-600);--interactive-primary-hover:var(--brand-700);--interactive-primary-pressed:var(--brand-800);--focus-ring:#168db2;--shadow-card:0 1px 2px rgba(12,72,91,0.05),0 8px 24px rgba(12,72,91,0.05);--shadow-hover:0 2px 4px rgba(12,72,91,0.06),0 14px 34px rgba(12,72,91,0.1);--shadow-modal:0 28px 80px rgba(7,47,61,0.2),0 10px 28px rgba(7,47,61,0.1);--nav-bg:rgba(251,253,254,0.88);--nav-border:#dbe7eb;--nav-item-hover:#eaf2f5;--nav-item-active-bg:#dff1f7;--nav-item-active-text:#09566f;--background:#f4f8fa;--foreground:#122b35;--motion-duration-quick:120ms;--motion-duration-fast:180ms;--motion-duration-standard:240ms;--motion-duration-slow:360ms;--motion-duration-page:480ms;--motion-ease-standard:cubic-bezier(0.2,0,0,1);--motion-ease-enter:cubic-bezier(0.05,0.7,0.1,1);--motion-ease-exit:cubic-bezier(0.3,0,1,1);--motion-ease-ambient:cubic-bezier(0.4,0,0.2,1);--motion-distance-xs:2px;--motion-distance-sm:6px;--motion-distance-md:12px;--motion-press-scale:0.98}.dark{--font-body:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--font-display:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--font-mono:"SF Mono","Cascadia Code","Roboto Mono",Consolas,"Liberation Mono",Menlo,monospace;--large-font-weight:900;--secondary-font-weight:400;--medium-font-weight:500;--small-font-weight:300;--x-large-font-size:5rem;--large-font-size:4rem;--medium-font-size:3rem;--small-font-size:2.5rem;--x-small-font-size:2rem;--xx-small-font-size:1.5rem;--normal-font-size:1rem;--content-max-width:1248px;--content-wide-width:1400px;--page-gutter:clamp(1.6rem,4vw,5.6rem);--nav-shell-width:min(104rem,calc(100vw - 2.4rem));--nav-shell-height:62px;--nav-shell-height-scrolled:57px;--nav-control-height:44px;--nav-mobile-height:64px;--radius-control:8px;--radius-card:8px;--radius-panel:10px;--radius-capsule:999px;--surface-blur:22px;--motion-fast:180ms ease;--motion-base:240ms ease;--z-sticky:30;--brand-50:#edf8fc;--brand-100:#d5eef7;--brand-200:#acddea;--brand-300:#76c5da;--brand-400:#3aa7c3;--brand-500:#1283a8;--brand-600:#0b6b8a;--brand-700:#09566f;--brand-800:#0c485b;--brand-900:#103c4b;--success-50:#edf9f3;--success-100:#d4f0e2;--success-200:#abe0c8;--success-300:#75c8a7;--success-400:#42aa84;--success-500:#218f68;--success-600:#0f7a54;--success-700:#0d6245;--success-800:#0e4e39;--success-900:#0c4030;--bg-page:#09161c;--bg-card:#10232c;--bg-elevated:#15303b;--bg-subtle:#17323c;--bg-hover:#20414c;--text-primary:#e8f2f5;--text-secondary:#bed2d9;--text-muted:#8ba4ad;--text-on-brand:#ffffff;--border-default:#274550;--border-subtle:#1d3842;--border-strong:#436470;--interactive-primary:var(--brand-400);--interactive-primary-hover:var(--brand-300);--interactive-primary-pressed:var(--brand-200);--focus-ring:#63c1da;--shadow-card:0 1px 2px rgba(0,0,0,0.24),0 10px 28px rgba(0,0,0,0.18);--shadow-hover:0 2px 6px rgba(0,0,0,0.3),0 16px 36px rgba(0,0,0,0.24);--shadow-modal:0 28px 90px rgba(0,0,0,0.58),0 10px 30px rgba(0,0,0,0.4);--nav-bg:rgba(16,35,44,0.9);--nav-border:#274550;--nav-item-hover:#17323c;--nav-item-active-bg:#173f4e;--nav-item-active-text:#8ed3e4;--background:#09161c;--foreground:#e8f2f5;--motion-duration-quick:120ms;--motion-duration-fast:180ms;--motion-duration-standard:240ms;--motion-duration-slow:360ms;--motion-duration-page:480ms;--motion-ease-standard:cubic-bezier(0.2,0,0,1);--motion-ease-enter:cubic-bezier(0.05,0.7,0.1,1);--motion-ease-exit:cubic-bezier(0.3,0,1,1);--motion-ease-ambient:cubic-bezier(0.4,0,0.2,1);--motion-distance-xs:2px;--motion-distance-sm:6px;--motion-distance-md:12px;--motion-press-scale:0.98}