:root{--font-heading: "Spectral", Georgia, serif;--font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", Consolas, monospace;--color-bg: #ffffff;--color-surface: #f8f9fa;--color-text: #0a0a0a;--color-text-secondary: #525252;--color-text-tertiary: #94a3b8;--color-accent: #0066ff;--color-border: #e2e8f0;--color-border-strong: #cbd5e1;--color-code-bg: #1e1e1e;--color-code-border: #333333;--color-code-text: #d4d4d4;--color-code-keyword: #569cd6;--color-code-function: #dcdcaa;--color-code-string: #ce9178;--color-code-number: #b5cea8;--color-code-comment: #6a9955;--color-button-bg: #292524;--color-button-text: #ffffff;--color-button-hover: #44403c;--space-xs: 8px;--space-sm: 16px;--space-md: 24px;--space-lg: 32px;--space-xl: 48px;--space-2xl: 64px;--space-3xl: 96px;--space-4xl: 128px;--space-5xl: 160px;--space-6xl: 192px;--radius-sm: 4px;--radius: 8px;--radius-lg: 12px;--text-xs: clamp(.75rem, .7rem + .25vw, .875rem);--text-sm: clamp(.875rem, .85rem + .125vw, .9375rem);--text-base: clamp(1rem, .95rem + .25vw, 1.125rem);--text-lg: clamp(1.125rem, 1.05rem + .375vw, 1.25rem);--text-xl: clamp(1.25rem, 1.15rem + .5vw, 1.5rem);--text-2xl: clamp(1.5rem, 1.35rem + .75vw, 1.875rem);--text-3xl: clamp(1.875rem, 1.65rem + 1.125vw, 2.25rem);--text-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);--text-5xl: clamp(3rem, 2.55rem + 2.25vw, 4rem);--breakpoint-sm: 640px;--breakpoint-md: 768px;--breakpoint-lg: 1024px;--breakpoint-xl: 1280px;--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px -1px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--container-max-width: 640px;--container-padding: var(--space-lg)}@media(min-width:768px){:root{--container-padding: var(--space-xl)}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:1.6;color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:400;line-height:1.2;color:var(--color-text);margin-bottom:var(--space-md);text-wrap:balance}h1,h2{font-weight:400}h3,h4,h5,h6{font-weight:600}h1{font-size:var(--text-5xl);letter-spacing:-.02em}h2{font-size:var(--text-3xl);letter-spacing:-.01em}h3{font-size:var(--text-xl);font-weight:600}p{widows:2;orphans:2;text-wrap:pretty}p:last-child{margin-bottom:0}a{color:var(--color-accent);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-text)}strong{font-weight:600}code{font-family:var(--font-mono);font-size:.9em;background-color:var(--color-code-bg);padding:2px 6px;border-radius:var(--radius-sm)}pre{font-family:var(--font-mono);font-size:var(--text-sm);line-height:1.6;overflow-x:auto;margin-bottom:var(--space-md)}pre code{background:none;padding:0;font-size:inherit}:focus{outline:2px solid var(--color-accent);outline-offset:2px}:focus:not(:focus-visible){outline:none}:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.container{max-width:var(--container-max-width);margin:0 auto;padding-left:var(--container-padding);padding-right:var(--container-padding)}.layout{display:flex;flex-direction:column;min-height:100vh}.main{flex:1;display:flex;flex-direction:column;gap:var(--space-lg)}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.brand-mark{font-family:var(--font-sans);font-size:var(--text-xl);font-weight:500;letter-spacing:-.01em;color:var(--color-text);display:inline-flex;align-items:center;gap:8px}.brand-logo{height:24px;width:auto;display:block}.header{padding:var(--space-lg) 0}@media(min-width:1024px){.header .container{max-width:1280px;padding-left:var(--space-2xl);padding-right:var(--space-2xl)}}button,.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;font-size:var(--text-base);font-weight:500;font-family:var(--font-sans);color:var(--color-button-text);background-color:var(--color-button-bg);border:none;border-radius:var(--radius);cursor:pointer;transition:background-color var(--transition-fast),transform var(--transition-fast);text-decoration:none;min-height:44px}button:hover,.button:hover{background-color:var(--color-button-hover);transform:translateY(-1px);box-shadow:0 4px 8px #0000001f}button:active,.button:active{transform:translateY(0);box-shadow:0 2px 4px #00000014}button:disabled,.button:disabled{opacity:.6;cursor:not-allowed;transform:none}button.button-full-width{width:100%}input[type=text],input[type=email],input[type=password],textarea{width:100%;padding:12px 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label{display:inline-flex;align-items:center;min-height:44px;padding:10px 18px;font-size:var(--text-sm);font-weight:500;color:var(--color-text);background-color:var(--color-surface);border:1.5px solid var(--color-border-strong);border-radius:var(--radius);cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none;margin-bottom:0}.option-pill label:hover{border-color:var(--color-text-secondary);background-color:var(--color-bg)}.option-pill input:checked+label{background-color:var(--color-button-bg);color:var(--color-button-text);border-color:var(--color-button-bg)}.option-pill input:focus-visible+label{outline:2px solid var(--color-accent);outline-offset:2px}.card{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-2xl);box-shadow:0 2px 8px #0000000f;transition:box-shadow var(--transition-slow),transform var(--transition-slow);cursor:pointer}.card:hover{box-shadow:0 8px 24px #0000001f;transform:translateY(-2px)}@media(min-width:768px){.card{padding:var(--space-3xl) var(--space-2xl)}}.code-block{font-family:var(--font-mono);font-size:13px;line-height:1.6;background-color:var(--color-code-bg);padding:var(--space-lg);border:1px solid var(--color-code-border);border-radius:var(--radius);overflow-x:auto;color:var(--color-code-text);box-shadow:0 4px 12px #00000026;margin:var(--space-lg) 0}@media(min-width:768px){.code-block{padding:var(--space-lg)}}.code-block .kw{color:var(--color-code-keyword)}.code-block .fn{color:var(--color-code-function)}.code-block .str{color:var(--color-code-string)}.code-block .num{color:var(--color-code-number)}.code-block .cmt{color:var(--color-code-comment)}.input-clearable{position:relative}.input-clearable input[type=email]{padding-right:36px}.input-clear-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);width:20px;height:20px;min-height:unset;background:none;border:none;padding:0;color:var(--color-text-tertiary);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.1rem;line-height:1;transition:color var(--transition-fast)}.input-clear-btn:hover{background:none;color:var(--color-text-secondary);transform:translateY(-50%);box-shadow:none}.input-clear-btn:active{transform:translateY(-50%);box-shadow:none}.privacy-note{font-size:var(--text-sm);color:var(--color-text-tertiary);text-align:center;margin-top:var(--space-md)}.success-message{font-family:var(--font-heading);text-align:center;padding:var(--space-2xl) var(--space-lg)}.success-message h3{font-family:var(--font-heading);font-size:var(--text-3xl);margin-bottom:var(--space-sm)}.success-message p{color:var(--color-text-secondary);font-size:var(--text-base)}.confirmation-icon{display:block;margin:0 auto var(--space-md);opacity:.5}.confirmation-body{color:var(--color-text-secondary);font-size:var(--text-base);font-family:var(--font-sans);margin-bottom:var(--space-md);text-wrap:balance}.confirmation-body strong{color:var(--color-text);font-weight:600}.confirmation-hint{font-size:var(--text-sm)!important;color:var(--color-text-tertiary);opacity:.8;font-family:var(--font-sans);text-wrap:balance;margin-bottom:0}.hero{display:flex;flex-direction:column;align-items:center;gap:var(--space-md);padding:0 var(--space-xl)}@media(min-width:768px){.hero{gap:var(--space-md);padding:var(--space-xl) 0 var(--space-xl)}}@media(min-width:1024px){.hero{align-items:flex-start;gap:var(--space-md);padding:var(--space-xl) 0 var(--space-xl)}}.hero-headline{font-family:var(--font-heading);font-size:clamp(2.75rem,7vw,3.5rem);line-height:1.2;font-weight:600;letter-spacing:-.02em;color:var(--color-text);max-width:32ch;text-align:center;text-wrap:balance}@media(min-width:768px){.hero-headline{font-size:clamp(2.75rem,6.5vw,3.75rem);line-height:1.15}}.hero-subheadline{font-size:var(--text-base);color:var(--color-text-secondary);line-height:1.3;text-align:center;text-wrap:pretty}@media(min-width:1024px){.hero-subheadline{text-align:center;font-size:var(--text-lg);line-height:1.5}}.subscribe-heading{text-align:center;margin-bottom:var(--space-xl);font-size:var(--text-2xl);font-family:var(--font-heading);font-weight:400}@media(min-width:768px){.subscribe-heading{font-size:var(--text-3xl)}}.signup-form{max-width:480px;margin:0 auto;display:flex;flex-direction:column;gap:var(--space-sm)}.label-hint{font-size:var(--text-xs);color:var(--color-text-tertiary);font-weight:400}.preview{padding:var(--space-xl) 0}@media(min-width:768px){.preview{padding:var(--space-3xl) 0}}.section-intro{font-family:var(--font-heading);font-size:var(--text-2xl);font-weight:400;color:var(--color-text);text-align:center;margin-bottom:var(--space-xl);letter-spacing:-.01em;text-transform:none}@media(min-width:768px){.section-intro{font-size:var(--text-3xl)}}.email-card{max-width:100%;background:transparent;border:none;box-shadow:none;padding:0;display:flex;flex-direction:column}.email-subject{font-family:var(--font-heading);font-size:var(--text-lg);font-weight:600;color:var(--color-text);line-height:1.4}@media(min-width:768px){.email-subject{font-size:var(--text-xl)}}.divider{height:1px;background-color:var(--color-border);margin:var(--space-lg) 0}.challenge{font-family:var(--font-heading);font-style:italic;font-size:var(--text-xl);font-weight:600;padding:0;border:none;text-align:center;text-wrap:balance;margin-bottom:var(--space-lg)}.thinking-dots{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);padding:var(--space-xl) 0;margin-bottom:var(--space-2xl)}.thinking-dots span{width:4px;height:4px;background-color:var(--color-text-tertiary);border-radius:50%;opacity:.4}.breakdown-title,.context-title{font-family:var(--font-heading);font-size:var(--text-xl);font-weight:600;color:var(--color-text);margin-bottom:var(--space-md)}.breakdown{list-style:none;padding:0;margin:0}.breakdown li{margin-bottom:var(--space-lg);line-height:1.7;widows:2;orphans:2;text-wrap:pretty}.breakdown li:last-child{margin-bottom:0}.breakdown strong{color:var(--color-text);font-weight:600}.context{line-height:1.7;color:var(--color-text-secondary);margin:0;widows:2;orphans:2;text-wrap:pretty}.footer{padding:var(--space-2xl) 0;text-align:center}.footer-copy{font-size:var(--text-sm);color:var(--color-text-tertiary)}.footer-link{font-size:var(--text-sm);color:var(--color-text-tertiary);text-decoration:none;transition:color var(--transition-fast)}.footer-link:hover{color:var(--color-text-secondary)}.confirmation-page{padding:var(--space-5xl) 0;min-height:60vh;display:flex;align-items:center}.confirmation-content{text-align:center;max-width:480px;margin:0 auto}.confirmation-content h1{font-size:var(--text-3xl);margin-bottom:var(--space-md)}@keyframes spin{to{transform:rotate(360deg)}}.confirmation-spinner{width:36px;height:36px;border:2px solid var(--color-border);border-top-color:var(--color-accent);border-radius:50%;animation:spin .75s linear infinite;margin:0 auto var(--space-md)}.confirmation-loading-text{color:var(--color-text-tertiary);font-size:var(--text-sm)}.confirmation-status-icon{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.25rem;font-weight:600;margin:0 auto var(--space-lg);line-height:1}.confirmation-icon-success{background-color:#0066ff14;color:var(--color-accent)}.confirmation-icon-warning{background-color:#d9770614;color:#d97706}.confirmation-icon-error{background-color:#dc262614;color:#dc2626}.confirmation-text{color:var(--color-text-secondary);margin-bottom:var(--space-xl)}.confirmation-text strong{color:var(--color-text)}.confirmation-action-btn{display:inline-block;font-size:var(--text-base);color:var(--color-button-text);background-color:var(--color-button-bg);text-decoration:none;padding:12px var(--space-lg);border-radius:var(--radius);transition:background-color var(--transition-fast),transform var(--transition-fast);margin-bottom:var(--space-md);min-height:44px;line-height:1.25}.confirmation-action-btn:hover{background-color:var(--color-button-hover);color:var(--color-button-text);transform:translateY(-1px)}.confirmation-retry-btn{margin-bottom:var(--space-md)}.confirmation-home-link{display:block;font-size:var(--text-sm);color:var(--color-text-tertiary);text-decoration:none;transition:color var(--transition-fast)}.confirmation-home-link:hover{color:var(--color-text-secondary)}.unsubscribe-page{padding:var(--space-5xl) 0;min-height:60vh;display:flex;align-items:center}.unsubscribe-content{text-align:center;max-width:480px;margin:0 auto}.unsubscribe-content h1{font-size:var(--text-3xl);margin-bottom:var(--space-md)}.unsubscribe-text{color:var(--color-text-secondary);margin-bottom:var(--space-xl)}.resubscribe-link{display:inline-block;font-size:var(--text-base);color:var(--color-accent);text-decoration:none;padding:var(--space-sm) var(--space-md);border:1.5px solid var(--color-accent);border-radius:var(--radius);transition:all var(--transition-fast)}.resubscribe-link:hover{background-color:var(--color-accent);color:#fff}@keyframes fade-up{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.animate-fade-up{animation:fade-up .6s ease-out both}.animate-fade-in{animation:fade-in .4s ease-out both}.animate-delay-100{animation-delay:.1s}.animate-delay-200{animation-delay:.2s}.animate-delay-300{animation-delay:.3s}.animate-delay-400{animation-delay:.4s}.animate-delay-500{animation-delay:.5s}@media(prefers-reduced-motion:reduce){.animate-fade-up,.animate-fade-in{animation:none;opacity:1;transform:none}}