:root{--bg-primary: #0f0f23;--bg-secondary: #1a1a2e;--bg-card: rgba(255, 255, 255, .03);--bg-glass: rgba(255, 255, 255, .05);--text-primary: #ffffff;--text-secondary: rgba(255, 255, 255, .7);--text-muted: rgba(255, 255, 255, .4);--border-color: rgba(255, 255, 255, .08);--border-active: rgba(255, 255, 255, .2);--amazon: #ff9900;--trendyol: #f27a1a;--hepsiburada: #ff6000;--profit: #00d26a;--profit-glow: rgba(0, 210, 106, .3);--loss: #ff4757;--loss-glow: rgba(255, 71, 87, .3);--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .2);--shadow-md: 0 4px 16px rgba(0, 0, 0, .3);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .4)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{max-width:1200px;margin:0 auto;padding:var(--space-lg);min-height:100vh}.layout{display:flex;flex-direction:column;gap:var(--space-lg);transition:all .5s cubic-bezier(.4,0,.2,1)}.layout__panel{flex:1;min-width:0;transition:all .5s cubic-bezier(.4,0,.2,1)}.layout__panel--left{display:flex;flex-direction:column;gap:var(--space-md)}.layout__panel--right{display:flex;flex-direction:column;gap:var(--space-md);opacity:1}@media(min-width:900px){.layout{flex-direction:row;justify-content:center;align-items:flex-start}.layout__panel--left{flex:0 0 520px;max-width:520px;position:relative}.layout__panel--right{flex:0;width:0;min-width:0;opacity:0;overflow:hidden;transform:translate(30px)}.layout--with-results{justify-content:flex-start}.layout--with-results .layout__panel--left{flex:0 0 420px;max-width:420px;position:sticky;top:var(--space-lg)}.layout--with-results .layout__panel--right{flex:1;width:auto;min-width:400px;opacity:1;overflow:visible;transform:translate(0)}.header{margin-bottom:var(--space-lg)}}@media(min-width:1100px){.layout__panel--left{flex:0 0 560px;max-width:560px}.layout--with-results .layout__panel--left{flex:0 0 480px;max-width:480px}}.header{text-align:center;margin-bottom:var(--space-2xl);padding-top:var(--space-lg)}.header__icon{font-size:3rem;margin-bottom:var(--space-sm);display:block}.header__title{font-size:1.5rem;font-weight:700;letter-spacing:-.02em;margin-bottom:var(--space-xs)}.header__subtitle{font-size:.875rem;color:var(--text-muted)}.card{background:var(--bg-glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-lg);margin-bottom:var(--space-md);transition:var(--transition-base)}.card:hover{border-color:var(--border-active)}.card__title{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:var(--space-md)}.platforms{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-sm)}.platform-btn{background:var(--bg-card);border:2px solid var(--border-color);border-radius:var(--radius-md);padding:var(--space-md) var(--space-sm);cursor:pointer;transition:var(--transition-base);display:flex;flex-direction:column;align-items:center;gap:var(--space-xs)}.platform-btn:hover{border-color:var(--border-active);transform:translateY(-2px)}.platform-btn.active{border-color:var(--platform-color, var(--text-primary));background:rgba(var(--platform-color-rgb, 255, 255, 255),.1);box-shadow:0 0 20px rgba(var(--platform-color-rgb, 255, 255, 255),.2)}.platform-btn__icon{font-size:1.5rem}.platform-btn__name{font-size:.75rem;font-weight:600;color:var(--text-secondary)}.platform-btn.active .platform-btn__name{color:var(--platform-color, var(--text-primary))}.form-group{margin-bottom:var(--space-md)}.form-group:last-child{margin-bottom:0}.form-label{display:block;font-size:.875rem;font-weight:500;color:var(--text-secondary);margin-bottom:var(--space-sm)}.form-input,.form-select{width:100%;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:var(--space-md);font-size:1rem;color:var(--text-primary);transition:var(--transition-fast);outline:none}.form-input:focus,.form-select:focus{border-color:var(--border-active);box-shadow:0 0 0 3px #ffffff0d}.form-input::placeholder{color:var(--text-muted)}.form-select{cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.5)' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--space-md) center;padding-right:var(--space-2xl)}.form-select option{background:var(--bg-secondary);color:var(--text-primary)}.input-group{position:relative}.input-suffix{position:absolute;right:var(--space-md);top:50%;transform:translateY(-50%);color:var(--text-muted);font-weight:500;pointer-events:none}.input-group .form-input{padding-right:var(--space-2xl)}.btn-calculate{width:100%;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:var(--radius-md);padding:var(--space-md) var(--space-lg);font-size:1rem;font-weight:600;color:#fff;cursor:pointer;transition:var(--transition-base);display:flex;align-items:center;justify-content:center;gap:var(--space-sm);margin-top:var(--space-lg)}.btn-calculate:hover{transform:translateY(-2px);box-shadow:0 8px 24px #667eea66}.btn-calculate:active{transform:translateY(0)}.results{animation:slideUp .4s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.results__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-lg);padding-bottom:var(--space-md);border-bottom:1px solid var(--border-color)}.results__platform{display:flex;align-items:center;gap:var(--space-sm)}.results__platform-dot{width:10px;height:10px;border-radius:50%;background:var(--platform-color)}.results__platform-name{font-weight:600;font-size:.875rem}.results__category{font-size:.75rem;color:var(--text-muted);background:var(--bg-card);padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm)}.results__row{display:flex;justify-content:space-between;align-items:center;padding:var(--space-sm) 0}.results__row--highlight{background:var(--bg-card);margin:0 calc(var(--space-lg) * -1);padding:var(--space-md) var(--space-lg);border-radius:var(--radius-sm)}.results__label{color:var(--text-secondary);font-size:.875rem}.results__value{font-weight:600;font-variant-numeric:tabular-nums}.results__value--negative{color:var(--loss)}.results__divider{height:1px;background:var(--border-color);margin:var(--space-md) 0}.net-profit{text-align:center;padding:var(--space-xl);margin:var(--space-lg) calc(var(--space-lg) * -1) calc(var(--space-lg) * -1);border-radius:0 0 var(--radius-lg) var(--radius-lg)}.net-profit--positive{background:linear-gradient(135deg,#00d26a1a,#00d26a0d);border-top:1px solid rgba(0,210,106,.2)}.net-profit--negative{background:linear-gradient(135deg,#ff47571a,#ff47570d);border-top:1px solid rgba(255,71,87,.2)}.net-profit__label{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:var(--space-sm)}.net-profit__value{font-size:2rem;font-weight:700;letter-spacing:-.02em}.net-profit--positive .net-profit__value{color:var(--profit);text-shadow:0 0 30px var(--profit-glow)}.net-profit--negative .net-profit__value{color:var(--loss);text-shadow:0 0 30px var(--loss-glow)}.net-profit__margin{font-size:.875rem;color:var(--text-secondary);margin-top:var(--space-xs)}.net-profit__icon{font-size:2.5rem;margin-bottom:var(--space-sm)}@media(max-width:480px){.app{padding:var(--space-md)}.header__title{font-size:1.25rem}.platform-btn{padding:var(--space-sm)}.platform-btn__name{font-size:.65rem}}.loading{display:flex;align-items:center;justify-content:center;gap:var(--space-sm)}.loading__spinner{width:20px;height:20px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.text-muted{color:var(--text-muted)}.text-secondary{color:var(--text-secondary)}.font-mono{font-family:SF Mono,Fira Code,monospace}.collapsible-header{width:100%;background:transparent;border:none;padding:0;display:flex;align-items:center;justify-content:space-between;cursor:pointer;color:var(--text-primary);font-size:.875rem}.collapsible-header__title{display:flex;align-items:center;gap:var(--space-sm);font-weight:500}.collapsible-header__badge{font-size:.65rem;font-weight:400;color:var(--text-muted);background:var(--bg-card);padding:2px 8px;border-radius:var(--radius-sm)}.collapsible-header__icon{transition:transform var(--transition-base);color:var(--text-muted);font-size:.75rem}.collapsible-header__icon.open{transform:rotate(180deg)}.collapsible-content{margin-top:var(--space-md);padding-top:var(--space-md);border-top:1px solid var(--border-color);animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.package-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}@media(min-width:400px){.package-grid{grid-template-columns:repeat(4,1fr)}}.package-grid .form-group{margin-bottom:0}.package-grid .form-input{text-align:center;padding:var(--space-sm) var(--space-xs);font-size:.875rem}.form-hint{font-size:.75rem;color:var(--text-muted);margin-top:var(--space-md);text-align:center;font-family:SF Mono,Fira Code,monospace}.app>.btn-calculate{margin-top:0;margin-bottom:var(--space-md)}.results__section{margin-bottom:var(--space-sm)}.results__section-title{font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.15em;color:var(--text-muted);margin-bottom:var(--space-sm)}.results__label--indent{padding-left:var(--space-md);font-size:.8rem}.results__value--positive{color:var(--profit)}.tabs-container{display:flex;gap:var(--space-sm);align-items:stretch;margin-bottom:var(--space-md)}.tabs{flex:1;display:flex;gap:var(--space-xs);background:var(--bg-glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-xs)}.history-toggle{display:flex;align-items:center;justify-content:center;gap:var(--space-xs);background:var(--bg-glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-sm) var(--space-md);font-size:.9rem;color:var(--text-secondary);cursor:pointer;transition:var(--transition-base);position:relative}.history-toggle:hover{color:var(--text-primary);border-color:var(--border-active)}.history-toggle.active{background:linear-gradient(135deg,#f903,#ff600033);color:var(--text-primary);border-color:#f90}.history-badge{position:absolute;top:-4px;right:-4px;background:#f90;color:#000;font-size:.65rem;font-weight:700;min-width:16px;height:16px;border-radius:50%;display:flex;align-items:center;justify-content:center}.history-panel{animation:slideUp .3s ease}.history-panel__header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-md)}.history-panel__title{font-size:.875rem;font-weight:600;color:var(--text-primary)}.history-panel__clear{background:#ff4b4b26;border:none;border-radius:var(--radius-sm);padding:var(--space-xs) var(--space-sm);font-size:.75rem;color:var(--loss);cursor:pointer;transition:var(--transition-base)}.history-panel__clear:hover{background:#ff4b4b4d}.history-panel__empty{text-align:center;padding:var(--space-lg);color:var(--text-muted)}.history-panel__empty span{font-size:2rem;display:block;margin-bottom:var(--space-sm);opacity:.5}.history-panel__empty p{font-size:.875rem}.history-list{display:flex;flex-direction:column;gap:var(--space-sm);max-height:300px;overflow-y:auto}.history-item{display:flex;align-items:center;gap:var(--space-sm);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:var(--space-sm);cursor:pointer;transition:var(--transition-base)}.history-item:hover{border-color:var(--border-active);transform:translate(4px)}.history-item--profit{border-left:3px solid var(--profit)}.history-item--loss{border-left:3px solid var(--loss)}.history-item__main{flex:1;display:flex;align-items:center;gap:var(--space-md);min-width:0}.history-item__platform{display:flex;align-items:center;gap:var(--space-xs);font-size:.75rem;color:var(--text-secondary);min-width:100px}.history-item__icon{font-size:1rem}.history-item__prices{display:flex;align-items:center;gap:var(--space-xs);font-size:.75rem;color:var(--text-muted)}.history-item__arrow{color:var(--text-muted);opacity:.5}.history-item__profit{font-size:.875rem;font-weight:600;margin-left:auto}.history-item__delete{background:transparent;border:none;width:24px;height:24px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:.75rem;color:var(--text-muted);cursor:pointer;transition:var(--transition-base);opacity:0}.history-item:hover .history-item__delete{opacity:1}.history-item__delete:hover{background:#ff4b4b33;color:var(--loss)}.tab{flex:1;background:transparent;border:none;border-radius:var(--radius-md);padding:var(--space-sm) var(--space-md);font-size:.8rem;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:var(--transition-base);display:flex;align-items:center;justify-content:center;gap:var(--space-xs)}.tab:hover{color:var(--text-primary);background:var(--bg-card)}.tab.active{background:linear-gradient(135deg,#667eea33,#764ba233);color:var(--text-primary);box-shadow:var(--shadow-sm)}.form-input--error{border-color:var(--loss)!important}.form-error{display:block;font-size:.75rem;color:var(--loss);margin-top:var(--space-xs)}.btn-compare{background:linear-gradient(135deg,#00d26a,#00a854)}.btn-compare:hover{box-shadow:0 8px 24px #00d26a66}.btn-target{background:linear-gradient(135deg,#f90,#ff6000)}.btn-target:hover{box-shadow:0 8px 24px #f906}.comparison-results{animation:slideUp .4s ease}.comparison-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md);margin-bottom:var(--space-lg)}@media(max-width:520px){.comparison-grid{grid-template-columns:1fr}}.comparison-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:var(--space-md);position:relative;transition:var(--transition-base)}.comparison-card--best{border-color:var(--profit);box-shadow:0 0 20px #00d26a33}.comparison-card--worst{opacity:.7}.comparison-card__badge{position:absolute;top:calc(var(--space-sm) * -1);right:var(--space-sm);background:var(--profit);color:#000;font-size:.65rem;font-weight:700;padding:2px 8px;border-radius:var(--radius-sm)}.comparison-card__badge--worst{background:var(--loss);color:#fff}.comparison-card__header{display:flex;align-items:center;gap:var(--space-sm);margin-bottom:var(--space-md)}.comparison-card__icon{font-size:1.25rem}.comparison-card__name{font-size:.75rem;font-weight:600;color:var(--text-secondary)}.comparison-card__profit{text-align:center;margin-bottom:var(--space-md)}.comparison-card__profit span{font-size:1.25rem;font-weight:700}.profit-positive{color:var(--profit)}.profit-negative{color:var(--loss)}.comparison-card__details{font-size:.75rem;color:var(--text-muted)}.comparison-card__row{display:flex;justify-content:space-between;padding:var(--space-xs) 0;border-top:1px solid var(--border-color)}.comparison-summary{text-align:center;padding:var(--space-md);background:#00d26a1a;border-radius:var(--radius-md);font-size:.875rem}.comparison-summary__text{color:var(--text-secondary)}.comparison-summary__text strong{color:var(--profit)}.target-results{animation:slideUp .4s ease}.target-section{text-align:center;padding:var(--space-md) 0}.target-section--highlight{background:#ff99001a;margin:0 calc(var(--space-lg) * -1);padding:var(--space-lg);border-radius:var(--radius-md)}.target-section__label{display:flex;align-items:center;justify-content:center;gap:var(--space-sm);font-size:.875rem;color:var(--text-secondary);margin-bottom:var(--space-sm)}.target-section__value{font-size:2rem;font-weight:700;letter-spacing:-.02em}.target-section__value--neutral{color:var(--text-secondary)}.target-section__value--success{color:#f90;text-shadow:0 0 30px rgba(255,153,0,.4)}.target-section__hint{font-size:.75rem;color:var(--text-muted);margin-top:var(--space-xs)}.verification-box{background:#00d26a1a;border-radius:var(--radius-md);padding:var(--space-md);margin-top:var(--space-md)}.verification-box__title{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--profit);margin-bottom:var(--space-sm)}.verification-box__row{display:flex;justify-content:space-between;font-size:.875rem;padding:var(--space-xs) 0}.verification-box__row span:first-child{color:var(--text-secondary)}@media(max-width:480px){.tabs{flex-wrap:wrap}.tab{font-size:.7rem;padding:var(--space-xs) var(--space-sm)}.target-section__value{font-size:1.5rem}}