:root{--color-primary:#6366f1;--color-primary-hover:#4f46e5;--color-primary-light:#e0e7ff;--color-secondary:#ec4899;--color-success:#10b981;--color-warning:#f59e0b;--color-danger:#ef4444;--color-bg:#fff;--color-bg-secondary:#f8fafc;--color-bg-tertiary:#f1f5f9;--color-surface:#fff;--color-border:#e2e8f0;--color-text:#1e293b;--color-text-secondary:#64748b;--color-text-tertiary:#94a3b8;--color-text-inverse:#fff;--font-sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;--font-mono:'JetBrains Mono','Fira Code',monospace;--text-xs:.75rem;--text-sm:.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--text-5xl:3rem;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--space-24:6rem;--container-max:1200px;--container-narrow:800px;--header-height:64px;--shadow-sm:0 1px 2px rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -2px rgba(0,0,0,0.1);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -4px rgba(0,0,0,0.1);--shadow-xl:0 20px 25px -5px rgba(0,0,0,0.1),0 8px 10px -6px rgba(0,0,0,0.1);--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:.75rem;--radius-xl:1rem;--radius-full:9999px;--transition-fast:150ms ease;--transition-base:250ms ease;--transition-slow:350ms ease}@media(prefers-color-scheme:dark){:root{--color-bg:#0f172a;--color-bg-secondary:#1e293b;--color-bg-tertiary:#334155;--color-surface:#1e293b;--color-border:#334155;--color-text:#f1f5f9;--color-text-secondary:#94a3b8;--color-text-tertiary:#64748b;--color-text-inverse:#0f172a;--color-primary-light:#312e81}}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:1.6;color:var(--color-text);background-color:var(--color-bg);min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}img,video,svg{max-width:100%;height:auto;display:block}a{color:var(--color-primary);text-decoration:none;transition:color 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var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);color:var(--color-text-secondary);font-size:var(--text-sm);cursor:pointer;transition:all var(--transition-fast)}.lang-switcher__btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.lang-switcher__dropdown{position:absolute;top:calc(100% + var(--space-2));right:0;min-width:180px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:var(--space-2);display:none;z-index:200}.lang-switcher__dropdown.is-open{display:block}.lang-switcher__link{display:block;padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);color:var(--color-text);font-size:var(--text-sm);transition:background 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.btn{min-height:48px}}.back-to-top{position:fixed;bottom:var(--space-8);right:var(--space-8);width:48px;height:48px;border-radius:var(--radius-full);background:var(--color-primary);color:var(--color-text-inverse);border:0;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(16px);transition:opacity var(--transition-base),visibility var(--transition-base),transform var(--transition-base),background var(--transition-fast);z-index:90}.back-to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:var(--color-primary-hover);transform:translateY(-2px)}.back-to-top:active{transform:translateY(0)}.back-to-top svg{width:20px;height:20px}.lang-switcher__btn{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);color:var(--color-text);font-size:var(--text-sm);font-weight:500;cursor:pointer;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);min-height:40px}.lang-switcher__btn:hover{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.lang-switcher__btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.lang-switcher__dropdown{position:absolute;top:calc(100% + var(--space-2));right:0;min-width:180px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:0 8px 24px rgba(0,0,0,0.12);padding:var(--space-2);opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity var(--transition-fast),visibility var(--transition-fast),transform var(--transition-fast);z-index:110}.lang-switcher__dropdown.is-open{opacity:1;visibility:visible;transform:translateY(0)}.lang-switcher__link{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);color:var(--color-text-secondary);font-size:var(--text-sm);font-weight:500;transition:background var(--transition-fast),color var(--transition-fast)}.lang-switcher__link:hover{background:var(--color-bg-tertiary);color:var(--color-text)}.lang-switcher__link.is-active{background:var(--color-primary-light);color:var(--color-primary);font-weight:600}@media(max-width:768px){.header__mobile-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;gap:5px;background:0;border:0;cursor:pointer;padding:var(--space-2);border-radius:var(--radius-md);transition:background var(--transition-fast)}.header__mobile-toggle:hover{background:var(--color-bg-tertiary)}.header__mobile-toggle span{display:block;width:22px;height:2px;background:var(--color-text);border-radius:2px;transition:transform var(--transition-base),opacity var(--transition-base)}.header__mobile-toggle.is-active span:nth-child(1){transform:translateY(7px) rotate(45deg)}.header__mobile-toggle.is-active span:nth-child(2){opacity:0}.header__mobile-toggle.is-active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.header__nav{position:fixed;top:var(--header-height);left:0;right:0;bottom:0;background:var(--color-bg);padding:var(--space-6);transform:translateX(100%);transition:transform var(--transition-base);overflow-y:auto;z-index:99}.header__nav.is-open{transform:translateX(0)}.header__nav-links{display:flex;flex-direction:column;gap:var(--space-2);list-style:none}.header__nav-links a{display:flex;align-items:center;padding:var(--space-4);font-size:var(--text-lg);border-radius:var(--radius-lg);transition:background var(--transition-fast);min-height:52px}.header__nav-links a:hover{background:var(--color-bg-tertiary)}.back-to-top{bottom:var(--space-6);right:var(--space-6)}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important}}@media print{.header,.footer,.wheel-controls,.btn{display:none !important}body{color:#000;background:#fff}}