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transparent)}}.ring-green-300{--tw-ring-color:var(--color-green-300)}.ring-red-300{--tw-ring-color:var(--color-red-300)}.ring-yellow-300{--tw-ring-color:var(--color-yellow-300)}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.transition-colors{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.duration-150{--tw-duration:.15s;transition-duration:.15s}.ease-in-out{--tw-ease:var(--ease-in-out);transition-timing-function:var(--ease-in-out)}.ring-inset{--tw-ring-inset:inset}@media (hover:hover){.hover\:border-neutral-300:hover{border-color:var(--gd-neutral-300)}.hover\:bg-brand-hover:hover{background-color:var(--gd-brand-primary-hover)}.hover\:bg-brand-light:hover{background-color:var(--gd-brand-primary-light)}.hover\:bg-neutral-50:hover{background-color:var(--gd-neutral-50)}.hover\:bg-red-700:hover{background-color:var(--color-red-700)}.hover\:text-brand:hover{color:var(--gd-brand-primary)}}.focus-visible\:ring-2:focus-visible{--tw-ring-shadow:var(--tw-ring-inset,) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color,currentcolor);box-shadow:var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow)}.focus-visible\:ring-brand:focus-visible{--tw-ring-color:var(--gd-brand-primary)}.focus-visible\:ring-red-600:focus-visible{--tw-ring-color:var(--color-red-600)}.focus-visible\:ring-offset-2:focus-visible{--tw-ring-offset-width:2px;--tw-ring-offset-shadow:var(--tw-ring-inset,) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color)}.focus-visible\:outline-none:focus-visible{--tw-outline-style:none;outline-style:none}.disabled\:cursor-not-allowed:disabled{cursor:not-allowed}.disabled\:opacity-40:disabled{opacity:.4}.disabled\:opacity-50:disabled{opacity:.5}.data-\[active\=true\]\:border-level-a2[data-active=true]{border-color:var(--gd-level-a2)}.data-\[active\=true\]\:border-level-b1[data-active=true]{border-color:var(--gd-level-b1)}.data-\[active\=true\]\:border-level-b2[data-active=true]{border-color:var(--gd-level-b2)}.data-\[active\=true\]\:border-level-c1[data-active=true]{border-color:var(--gd-level-c1)}.data-\[active\=true\]\:border-level-c2[data-active=true]{border-color:var(--gd-level-c2)}.data-\[active\=true\]\:text-level-a2[data-active=true]{color:var(--gd-level-a2)}.data-\[active\=true\]\:text-level-b1[data-active=true]{color:var(--gd-level-b1)}.data-\[active\=true\]\:text-level-b2[data-active=true]{color:var(--gd-level-b2)}.data-\[active\=true\]\:text-level-c1[data-active=true]{color:var(--gd-level-c1)}.data-\[active\=true\]\:text-level-c2[data-active=true]{color:var(--gd-level-c2)}@media (min-width:40rem){.sm\:block{display:block}.sm\:hidden{display:none}.sm\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.sm\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (min-width:64rem){.lg\:block{display:block}.lg\:flex{display:flex}.lg\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.lg\:grid-cols-\[160px_1fr_160px\]{grid-template-columns:160px 1fr 160px}.lg\:flex-col{flex-direction:column}.lg\:items-end{align-items:flex-end}.lg\:items-start{align-items:flex-start}.lg\:pt-4{padding-top:calc(var(--spacing) * 4)}}}:root{--gd-brand-primary:#1d4ed8;--gd-brand-primary-hover:#1e40af;--gd-brand-primary-dark:#1e3a5f;--gd-brand-primary-light:#dbeafe;--gd-brand-accent:#f59e0b;--gd-brand-accent-light:#fef3c7;--gd-neutral-900:#0f1117;--gd-neutral-700:#3a3d47;--gd-neutral-600:#4b5563;--gd-neutral-500:#5e6272;--gd-neutral-400:#717589;--gd-neutral-300:#d1d4e0;--gd-neutral-200:#e4e6ed;--gd-neutral-100:#f5f6fa;--gd-neutral-50:#f9fafb;--gd-white:#fff;--gd-success:#15803d;--gd-success-light:#dcfce7;--gd-error:#dc2626;--gd-error-light:#fee2e2;--gd-warning:#d97706;--gd-warning-light:#fef3c7;--gd-info:#1d4ed8;--gd-info-light:#dbeafe;--gd-level-a2:#0891b2;--gd-level-a2-light:#e0f2fe;--gd-level-b1:#3b82f6;--gd-level-b1-light:#eff6ff;--gd-level-b2:#dc3b08;--gd-level-b2-light:#fee4d4;--gd-level-c1:#7c3aed;--gd-level-c1-light:#ede9fe;--gd-level-c2:#065f46;--gd-level-c2-light:#d1fae5;--gd-hero-gradient:linear-gradient(135deg, #0a1628 0%, #1e3a5f 55%, #0c2340 100%);--gd-brand-on-dark-accent:#93c5fd;--gd-brand-on-dark-overlay:#2563eb40;--gd-brand-on-dark-border:#2563eb66;--gd-brand-on-dark-glow:#2563eb66;--gd-brand-on-dark-glow-hover:#2563eb8c;--gd-brand-on-dark-radial:#0ea5e92e;--gd-shadow-sm:0 1px 3px #0f111714, 0 1px 2px #0f11170a;--gd-shadow-md:0 4px 24px #0f11171a;--gd-shadow-lg:0 12px 48px #0f111729;--gd-shadow-focus:0 0 0 3px #2563eb4d;--gd-font-sans:var(--font-dm-sans), Arial, Helvetica, sans-serif;--gd-font-heading:var(--font-lora), Georgia, "Times New Roman", serif;--gd-font-mono:var(--font-jetbrains-mono), "Courier New", Consolas, monospace;--gd-text-xs:.75rem;--gd-text-sm:.875rem;--gd-text-base:1rem;--gd-text-lg:1.125rem;--gd-text-xl:1.25rem;--gd-text-2xl:1.5rem;--gd-text-3xl:1.875rem;--gd-leading-tight:1.25;--gd-leading-normal:1.6;--gd-leading-relaxed:1.8;--gd-font-normal:400;--gd-font-medium:500;--gd-font-semibold:600;--gd-font-bold:700;--gd-font-extrabold:800;--gd-space-1:.25rem;--gd-space-2:.5rem;--gd-space-3:.75rem;--gd-space-4:1rem;--gd-space-5:1.25rem;--gd-space-6:1.5rem;--gd-space-8:2rem;--gd-space-10:2.5rem;--gd-space-12:3rem;--gd-space-16:4rem;--gd-radius-sm:.25rem;--gd-radius-md:.5rem;--gd-radius-lg:.75rem;--gd-radius-xl:.875rem;--gd-radius-full:9999px;--gd-transition-fast:.15s ease-in-out;--gd-transition-normal:.25s ease-in-out;--hero-pt:80px;--hero-pb:72px;--hero-pt-sm:56px;--hero-pb-sm:52px;--topic-hero-pt:36px;--topic-hero-pt-sm:24px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}.skip-nav{z-index:9999;background:var(--gd-brand-primary);color:var(--gd-white);border-radius:var(--gd-radius-md);font-size:var(--gd-text-sm);padding:.5rem 1rem;font-weight:600;text-decoration:none;transition:top .1s;position:absolute;top:-100%;left:1rem}.skip-nav:focus{top:1rem}body{font-family:var(--gd-font-sans);font-size:var(--gd-text-base);font-weight:400;line-height:var(--gd-leading-normal);color:var(--gd-neutral-700);background-color:var(--gd-white);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-family:var(--gd-font-heading)}a{color:inherit;text-decoration:none}img,svg{max-width:100%;display:block}button{cursor:pointer;background:0 0;border:none;font-family:inherit}ul,ol{list-style:none}input,select{font-family:inherit}.container{width:100%;max-width:1120px;padding-left:var(--gd-space-4);padding-right:var(--gd-space-4);margin:0 auto}@media (max-width:360px){.container{padding-left:var(--gd-space-3);padding-right:var(--gd-space-3)}}@media (min-width:1024px){.container{padding-left:var(--gd-space-6);padding-right:var(--gd-space-6)}}.exercise-content{max-width:720px;margin:0 auto}.page-wrapper{flex-direction:column;min-height:100dvh;display:flex}main{flex:1}.site-header{z-index:50;-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--gd-neutral-300);background:#fffffff7;height:56px;position:sticky;top:0}@media (min-width:1024px){.site-header{height:64px}}.header-nav{justify-content:space-between;align-items:center;height:100%;display:flex}.logo-text{font-family:var(--gd-font-heading);font-size:var(--gd-text-xl);font-weight:var(--gd-font-bold);color:var(--gd-neutral-900);letter-spacing:0}.nav-links{align-items:center;gap:var(--gd-space-2);display:flex}@media (min-width:640px){.nav-links{gap:var(--gd-space-4)}}@media (min-width:1024px){.nav-links{gap:var(--gd-space-6)}}.nav-links a{font-size:.75rem;font-weight:var(--gd-font-semibold);color:var(--gd-neutral-500);transition:color var(--gd-transition-fast);letter-spacing:.01em;white-space:nowrap}@media (min-width:640px){.nav-links a{font-size:var(--gd-text-sm)}}.nav-links a:hover{color:var(--gd-neutral-900)}.nav-links a.active{color:var(--gd-neutral-900);text-underline-offset:4px;text-decoration:underline;text-decoration-thickness:2px}.nav-links .nav-about{padding-left:var(--gd-space-2);border-left:1px solid var(--gd-neutral-300);color:var(--gd-neutral-500)}@media (min-width:640px){.nav-links .nav-about{padding-left:var(--gd-space-3)}}.nav-hamburger{border-radius:var(--gd-radius-md);width:44px;height:44px;color:var(--gd-neutral-700);cursor:pointer;transition:background-color var(--gd-transition-fast);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;padding:0;display:none}.nav-hamburger:hover{background-color:var(--gd-neutral-100)}.nav-hamburger:focus{box-shadow:var(--gd-shadow-focus);outline:none}.nav-hamburger-icon,.nav-close-icon{pointer-events:none;width:22px;height:22px}.nav-close-icon,.site-header.nav-open .nav-hamburger-icon{display:none}.site-header.nav-open .nav-close-icon{display:block}@media (max-width:639px){.nav-hamburger{display:flex}.nav-links{background:var(--gd-white);border-bottom:1px solid var(--gd-neutral-300);padding:var(--gd-space-2) var(--gd-space-4) var(--gd-space-3);box-shadow:var(--gd-shadow-md);z-index:49;flex-direction:column;gap:0;display:none;position:absolute;top:56px;left:0;right:0}.site-header.nav-open .nav-links{display:flex}.nav-links a{font-size:var(--gd-text-base);padding:var(--gd-space-3) 0;border-bottom:1px solid var(--gd-neutral-100);color:var(--gd-neutral-700);white-space:normal}.nav-links a:last-child{border-bottom:none}.nav-links .nav-about{border-left:none;padding-left:0}}.site-footer{background-color:var(--gd-neutral-900);padding:var(--gd-space-6) 0;border-top:none;margin-top:auto}.footer-content{text-align:center;font-size:var(--gd-text-sm);color:#ffffffa6;letter-spacing:.01em}.footer-content a{color:#ffffffa6;transition:color var(--gd-transition-fast)}.footer-content a:hover{color:var(--gd-white)}.footer-sep{margin:0 var(--gd-space-2);color:#ffffff40}.breadcrumb{margin-bottom:var(--gd-space-4)}.breadcrumb ol{align-items:center;gap:var(--gd-space-1);flex-wrap:wrap;display:flex}.breadcrumb li{font-size:var(--gd-text-sm);color:var(--gd-neutral-500)}.breadcrumb a{color:var(--gd-neutral-500);transition:color var(--gd-transition-fast)}.breadcrumb a:hover{color:var(--gd-brand-primary);text-decoration:underline}.breadcrumb [aria-current=page]{color:var(--gd-neutral-700);font-weight:var(--gd-font-medium)}.breadcrumb .separator{color:var(--gd-neutral-300)}.level-chips{gap:var(--gd-space-2);flex-wrap:wrap;display:flex}.chip{height:44px;padding:0 var(--gd-space-4);border-radius:var(--gd-radius-md);font-size:var(--gd-text-sm);cursor:pointer;transition:background-color var(--gd-transition-fast), color var(--gd-transition-fast), border-color var(--gd-transition-fast);background-color:var(--gd-white);color:var(--gd-neutral-700);border:1px solid var(--gd-neutral-300);-webkit-user-select:none;user-select:none;align-items:center;font-weight:600;display:inline-flex}.chip:hover{background-color:var(--gd-neutral-200)}.chip:focus{box-shadow:var(--gd-shadow-focus);outline:none}.chip.active{background-color:var(--gd-brand-primary);color:var(--gd-white)}.hero{background:var(--gd-hero-gradient);padding:var(--hero-pt) 0 var(--hero-pb);color:#fff;border-bottom:none;margin-bottom:0;position:relative;overflow:hidden}.hero:before{content:"";background-image:radial-gradient(circle at 80% 20%, #ffffff0f 0%, transparent 50%), radial-gradient(circle at 10% 80%, var(--gd-brand-on-dark-radial) 0%, transparent 40%);pointer-events:none;position:absolute;inset:0}.hero:after{content:"GD";font-family:var(--gd-font-heading);color:#ffffff0a;pointer-events:none;font-size:22vw;font-weight:900;line-height:1;position:absolute;top:-10px;right:-20px}@media (max-width:640px){.hero{padding:var(--hero-pt-sm) 0 var(--hero-pb-sm)}.hero:after{display:none}}.hero-inner{gap:var(--gd-space-16);grid-template-columns:1fr 400px;align-items:center;display:grid;position:relative}@media (max-width:900px){.hero-inner{grid-template-columns:1fr}.hero-card{margin-top:var(--gd-space-4)}.hero-card h2{display:none}.hero-card-links{flex-direction:column;gap:8px}.hero-card-link{width:100%}}.hero-text{position:relative}.hero-eyebrow{align-items:center;gap:var(--gd-space-2);margin-bottom:var(--gd-space-5);display:flex}.hero-badge{padding:var(--gd-space-1) var(--gd-space-3);border-radius:var(--gd-radius-full);background:var(--gd-brand-on-dark-overlay);color:var(--gd-brand-on-dark-accent);border:1px solid var(--gd-brand-on-dark-border);font-size:var(--gd-text-xs);letter-spacing:.06em;text-transform:uppercase;align-items:center;font-weight:700;display:inline-flex}.hero-eyebrow>span:not(.hero-badge){font-size:var(--gd-text-sm);color:#ffffff8c}.hero-title{font-family:var(--gd-font-heading);color:#fff;letter-spacing:-.02em;margin-bottom:var(--gd-space-4);font-size:clamp(2rem,4vw,2.8rem);font-weight:900;line-height:1.15}.hero-accent{color:var(--gd-brand-on-dark-accent);font-style:italic}.hero-subtitle{color:#ffffffbf;margin-bottom:var(--gd-space-6);max-width:520px;font-size:1.05rem;line-height:1.7}.hero-actions{align-items:center;gap:var(--gd-space-3);margin-bottom:var(--gd-space-3);flex-wrap:wrap;display:flex}.btn-hero-primary{align-items:center;gap:var(--gd-space-2);background:var(--gd-brand-primary);color:#fff;font-weight:700;font-size:var(--gd-text-base);padding:var(--gd-space-3) var(--gd-space-6);border-radius:var(--gd-radius-lg);text-decoration:none;transition:background .15s,transform .1s;display:inline-flex}.btn-hero-primary:hover{background:var(--gd-brand-primary-hover);transform:translateY(-2px)}.btn-hero-secondary{color:#fff;font-weight:600;font-size:var(--gd-text-base);padding:var(--gd-space-3) var(--gd-space-5);border-radius:var(--gd-radius-lg);background:#ffffff1f;border:1px solid #ffffff40;align-items:center;text-decoration:none;transition:background .15s;display:inline-flex}.btn-hero-secondary:hover{background:#fff3}.hero-cta-note{font-size:var(--gd-text-xs);color:#ffffff8c;letter-spacing:.02em}.hero-card{-webkit-backdrop-filter:blur(16px);background:#ffffff1a;border:1px solid #ffffff2e;border-radius:16px;flex-shrink:0;padding:32px}.hero-card h2{color:#ffffffd9;letter-spacing:.02em;margin-bottom:18px;font-size:1rem;font-weight:600}.hero-card-links{flex-direction:column;gap:10px;display:flex}.hero-card-link{color:#ffffffe0;background:#ffffff14;border:1px solid #ffffff14;border-radius:8px;align-items:center;gap:10px;padding:11px 14px;text-decoration:none;transition:background .15s;display:flex}.hero-card-link:hover{background:#ffffff29}.hero-card-lbl{font-size:.9rem;font-weight:500}.hero-card-count{color:#fff9;background:#ffffff1f;border-radius:4px;padding:2px 7px;font-size:.75rem;font-weight:600}.hero-card-arr{opacity:.5;margin-left:auto}.trust-bar{background:var(--gd-neutral-900);color:#fff9;padding:14px 0}.trust-bar-inner{flex-wrap:wrap;justify-content:center;align-items:center;gap:40px;display:flex}.trust-item{align-items:center;gap:6px;font-size:.82rem;display:flex}.trust-item strong{color:#fff;font-size:1.05rem}@media (max-width:640px){.trust-bar-inner{gap:20px}}.section-header{margin-bottom:var(--gd-space-4)}@media (min-width:640px){.section-header{margin-bottom:var(--gd-space-6)}}.section-title{font-family:var(--gd-font-heading);font-size:var(--gd-text-lg);font-weight:var(--gd-font-bold);color:var(--gd-neutral-900);letter-spacing:0}@media (min-width:640px){.section-title{font-size:var(--gd-text-xl)}}.page-section{padding:var(--gd-space-5) 0 var(--gd-space-8)}@media (min-width:640px){.page-section{padding:var(--gd-space-8) 0 var(--gd-space-12)}}.page-header{margin-bottom:var(--gd-space-4)}@media (min-width:640px){.page-header{margin-bottom:var(--gd-space-6)}}.page-title-row{justify-content:space-between;align-items:baseline;gap:var(--gd-space-2);margin-bottom:var(--gd-space-3);flex-wrap:wrap;display:flex}.page-title{font-family:var(--gd-font-heading);font-size:var(--gd-text-xl);font-weight:var(--gd-font-bold);color:var(--gd-neutral-900);line-height:var(--gd-leading-tight);letter-spacing:0}@media (min-width:640px){.page-title{font-size:var(--gd-text-2xl)}}.exercise-count-badge{font-size:var(--gd-text-sm);color:var(--gd-neutral-500)}.page-header-strip .container{gap:var(--gd-space-3);flex-direction:column;display:flex}.page-header-strip h1{color:var(--gd-white);font-size:clamp(1.75rem,4vw,2.5rem);font-weight:var(--gd-font-bold);margin:0}.page-header-strip p.lead{color:var(--gd-brand-on-dark-accent);max-width:640px;margin:0;font-size:1.05rem}.page-breadcrumb{background:var(--gd-neutral-100);border-bottom:1px solid var(--gd-neutral-200);padding:10px 0}.page-breadcrumb ol{flex-wrap:wrap;gap:4px;margin:0;padding:0;font-size:.85rem;list-style:none;display:flex}.page-breadcrumb li{color:var(--gd-neutral-500);align-items:center;gap:4px;display:flex}.page-breadcrumb a{color:var(--gd-brand-primary);text-decoration:none}.page-breadcrumb a:hover{text-decoration:underline}.page-breadcrumb [aria-current=page]{color:var(--gd-neutral-600);font-weight:500}.page-breadcrumb .sep{color:var(--gd-neutral-300)}.page-body{padding:var(--gd-space-8) 0}@media (min-width:1024px){.content-with-sidebar{grid-template-columns:1fr 300px}}.topic-grid{gap:var(--gd-space-3);grid-template-columns:1fr;display:grid}@media (min-width:640px){.topic-grid{gap:var(--gd-space-4);grid-template-columns:1fr 1fr}}@media (min-width:1024px){.topic-grid{grid-template-columns:1fr 1fr 1fr}}.topic-card{background-color:var(--gd-white);border:1px solid var(--gd-neutral-200);border-radius:var(--gd-radius-xl);box-shadow:var(--gd-shadow-sm);padding:var(--gd-space-4);transition:box-shadow var(--gd-transition-fast), border-color var(--gd-transition-fast), transform var(--gd-transition-fast);color:inherit;text-decoration:none;display:block}@media (min-width:640px){.topic-card{padding:var(--gd-space-6)}}.topic-icon-wrap{border-radius:var(--gd-radius-md);flex-shrink:0;justify-content:center;align-items:center;width:48px;height:48px;display:flex}.topic-icon-wrap 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