:root{--font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;--transition-speed:0.3s;--btn-radius:clamp(1rem, 2.5vw, 1.25rem);--sidebar-width:min(280px, 75vw);--history-width:min(360px, 85vw)}:root,[data-theme=light]{--bg-gradient:linear-gradient(135deg, #e8e0d8 0%, #d4ccc4 50%, #dcd4cc 100%);--glass-bg:rgba(255, 255, 255, 0.55);--glass-border:rgba(255, 255, 255, 0.85);--glass-shadow:0 8px 32px rgba(40, 40, 50, 0.12),0 2px 8px rgba(40, 40, 50, 0.06);--text-color:#2a2a2a;--text-secondary-color:#5a5a5a;--btn-bg:rgba(255, 252, 248, 0.6);--btn-hover-bg:rgba(255, 252, 248, 0.85);--btn-active-bg:rgba(250, 247, 243, 0.95);--function-btn-bg:rgba(220, 210, 200, 0.65);--function-btn-hover:rgba(210, 200, 190, 0.85);--function-btn-text:#3a3a3a;--operator-bg:linear-gradient(135deg, #ff7043 0%, #ff5722 100%);--operator-text-color:#fff;--equals-bg:linear-gradient(135deg, #2196f3 0%, #1976d2 100%);--equals-text-color:#fff;--icon-color:#5a5a5a;--display-bg:rgba(255, 250, 245, 0.5);--display-text:#1a1a1a;--control-hover:rgba(255, 252, 248, 0.75);--focus-ring-color:#2196f3;--border-subtle:rgba(255, 255, 255, 0.75);--logo-gradient:linear-gradient(135deg, #ff8a65 0%, #ff6b45 50%, #ff5722 100%);--logo-shadow:0 6px 20px rgba(255, 107, 69, 0.35),0 2px 8px rgba(255, 87, 34, 0.25);--active-btn-bg:#fff;--second-fn-btn-bg:rgba(210, 200, 190, 0.9);--second-fn-btn-text:#2a2a2a}[data-theme=dark]{--bg-gradient:linear-gradient(135deg, #0f1219 0%, #1a1f2e 50%, #1f2433 100%);--glass-bg:rgba(255, 255, 255, 0.1);--glass-border:rgba(255, 255, 255, 0.22);--glass-shadow:0 8px 32px rgba(0, 0, 0, 0.5),0 2px 8px rgba(0, 0, 0, 0.3);--text-color:#f0f0f0;--text-secondary-color:#9ca3af;--btn-bg:rgba(255, 255, 255, 0.11);--btn-hover-bg:rgba(255, 255, 255, 0.17);--btn-active-bg:rgba(255, 255, 255, 0.24);--function-btn-bg:rgba(255, 255, 255, 0.14);--function-btn-hover:rgba(255, 255, 255, 0.21);--function-btn-text:#e0e0e0;--icon-color:#9ca3af;--display-bg:rgba(0, 0, 0, 0.35);--display-text:#fafafa;--control-hover:rgba(255, 255, 255, 0.15);--focus-ring-color:#42a5f5;--border-subtle:rgba(255, 255, 255, 0.2);--logo-gradient:linear-gradient(135deg, #5c9aff 0%, #4a8ae8 50%, #3b7dd6 100%);--logo-shadow:0 6px 20px rgba(92, 154, 255, 0.4),0 2px 8px rgba(59, 125, 214, 0.3);--active-btn-bg:rgba(255, 255, 255, 0.25);--second-fn-btn-bg:rgba(255, 255, 255, 0.22);--second-fn-btn-text:#f0f0f0}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media (prefers-reduced-motion:reduce){*,::after,::before{animation-duration:0s!important;transition-duration:0s!important}}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html{font-size:clamp(14px, 1.5vw, 16px);scroll-behavior:smooth}body,html{height:100%}body{font-family:var(--font-family);background:var(--bg-gradient);background-attachment:fixed;color:var(--text-color);transition:background var(--transition-speed) ease,color var(--transition-speed) ease;display:flex;position:relative;touch-action:manipulation;line-height:1.6;overflow-x:hidden;overflow-y:auto;min-height:100vh}:focus-visible{outline:2px solid var(--focus-ring-color);outline-offset:2px;border-radius:12px}.history-item:focus-visible,.keypad-btn:focus-visible{border-radius:var(--btn-radius)}body::before{content:'';position:fixed;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 30% 40%,rgba(92,154,255,.06) 0,transparent 45%),radial-gradient(circle at 70% 70%,rgba(255,138,101,.05) 0,transparent 45%);pointer-events:none;z-index:0}.glass{background:var(--glass-bg);-webkit-backdrop-filter:blur(36px) saturate(160%);backdrop-filter:blur(36px) saturate(160%);border:1.5px solid var(--glass-border);border-radius:clamp(16px,4vw,24px);box-shadow:var(--glass-shadow);transition:all var(--transition-speed) ease;position:relative}.glass::before{content:'';position:absolute;top:0;left:0;right:0;height:50%;border-radius:clamp(16px,4vw,24px) clamp(16px,4vw,24px) 0 0;background:linear-gradient(180deg,rgba(255,255,255,.1) 0,transparent 100%);pointer-events:none}[data-theme=dark] .glass::before{background:linear-gradient(180deg,rgba(255,255,255,.06) 0,transparent 100%)}.app-container{display:flex;width:100%;min-height:100%;position:relative;z-index:1}.history-panel,.sidebar{z-index:200}.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;height:100dvh;transform:translateX(-100%);transition:transform .3s cubic-bezier(.4, 0, .2, 1);padding:clamp(1.5rem,4vw,2rem) clamp(1rem,3vw,1.5rem);display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden}.sidebar.open{transform:translateX(0)}.sidebar-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:clamp(1.5rem,4vw,2.5rem);gap:1rem}.brand-link{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:var(--text-color);transition:all .3s ease;padding:.5rem;margin:-.5rem;border-radius:12px;flex:1;min-width:0}.brand-link:hover{transform:translateX(2px)}.brand-link:hover .logo{transform:rotate(-5deg) scale(1.05);box-shadow:var(--logo-shadow),0 0 20px rgba(255,107,69,.3)}[data-theme=dark] .brand-link:hover .logo{box-shadow:var(--logo-shadow),0 0 20px rgba(92,154,255,.3)}.sidebar-title{font-size:clamp(1.25rem, 4vw, 1.5rem);font-weight:700;letter-spacing:-.02em;color:var(--text-color);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.logo{width:clamp(40px,10vw,48px);height:clamp(40px,10vw,48px);background:var(--logo-gradient);border-radius:clamp(10px,3vw,14px);display:flex;align-items:center;justify-content:center;font-size:clamp(1.25rem, 3.5vw, 1.5rem);color:#fff;font-weight:800;box-shadow:var(--logo-shadow);flex-shrink:0;position:relative;transition:all .3s cubic-bezier(.4, 0, .2, 1);overflow:hidden}.logo::before{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:linear-gradient(45deg,transparent 30%,rgba(255,255,255,.3) 50%,transparent 70%);transform:translateX(-100%);transition:transform .6s ease}.brand-link:hover .logo::before{transform:translateX(100%)}.theme-switcher{position:relative;width:clamp(40px,10vw,48px);height:clamp(40px,10vw,48px);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:clamp(1rem, 3vw, 1.2rem);border-radius:clamp(10px,3vw,14px);transition:all .2s ease;background:var(--btn-bg);border:1.5px solid var(--glass-border);color:var(--icon-color);flex-shrink:0}.theme-switcher:hover{background:var(--btn-hover-bg);transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.1)}.theme-switcher i{position:absolute;transition:transform .4s cubic-bezier(.68, -.55, .27, 1.55),opacity .3s ease}.theme-switcher .fa-moon{transform:scale(1) rotate(0);opacity:1}.theme-switcher .fa-sun{transform:scale(0) rotate(-90deg);opacity:0}[data-theme=dark] .theme-switcher .fa-moon{transform:scale(0) rotate(90deg);opacity:0}[data-theme=dark] .theme-switcher .fa-sun{transform:scale(1) rotate(0);opacity:1}.nav-list{list-style-type:none}.nav-list li a{display:flex;align-items:center;padding:clamp(12px,3vw,16px) clamp(14px,3.5vw,18px);text-decoration:none;color:var(--text-color);border-radius:clamp(10px,3vw,14px);transition:all .2s ease;font-weight:500;font-size:clamp(.875rem, 2.2vw, .95rem);border:1.5px solid transparent}.nav-list li a:hover{background:var(--control-hover);transform:translateX(4px);border-color:var(--border-subtle)}.nav-list li.active a{background:var(--btn-hover-bg);font-weight:600;border-color:var(--border-subtle)}.nav-list li a i{margin-right:clamp(10px,3vw,14px);width:22px;text-align:center;font-size:clamp(.95rem, 2.5vw, 1.1rem);color:var(--icon-color)}.sidebar-footer{margin-top:auto;padding-top:1.5rem}#language-switcher{width:100%;padding:clamp(12px,3vw,14px) clamp(14px,3.5vw,18px);border-radius:clamp(10px,3vw,14px);border:1.5px solid var(--glass-border);background:var(--btn-bg);color:var(--text-color);font-family:var(--font-family);font-size:clamp(.875rem, 2.2vw, .95rem);cursor:pointer;transition:all .2s ease;font-weight:500}[data-theme=light] #language-switcher option{background:#faf7f4;color:#404040}[data-theme=dark] #language-switcher option{background:#1c1f2e;color:#e8e8e8}#language-switcher:hover{background:var(--btn-hover-bg);border-color:var(--border-subtle)}.menu-toggle{position:fixed;top:clamp(1rem,3vw,1.5rem);left:clamp(1rem,3vw,1.5rem);z-index:210;width:clamp(44px,11vw,48px);height:clamp(44px,11vw,48px);display:none;align-items:center;justify-content:center;font-size:clamp(1.1rem, 3vw, 1.2rem);background:var(--glass-bg);-webkit-backdrop-filter:blur(36px);backdrop-filter:blur(36px);border:1.5px solid var(--glass-border);border-radius:clamp(10px,3vw,14px);color:var(--icon-color);cursor:pointer;box-shadow:var(--glass-shadow);transition:all .2s ease}.menu-toggle:hover{background:var(--btn-hover-bg);transform:translateY(-2px)}.menu-toggle i{position:absolute;transition:transform .3s cubic-bezier(.4, 0, .2, 1),opacity .2s}.menu-toggle .fa-bars{transform:rotate(0);opacity:1}.menu-toggle.open .fa-bars{transform:rotate(90deg);opacity:0}.menu-toggle .fa-times{transform:rotate(-90deg);opacity:0}.menu-toggle.open .fa-times{transform:rotate(0);opacity:1}.menu-toggle.open{background:var(--btn-hover-bg)}.app-body{flex-grow:1;display:flex;flex-direction:column;transition:margin-left var(--transition-speed) ease,margin-right var(--transition-speed) ease;min-height:100vh}.main-content{flex-grow:1;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:clamp(1rem,4vw,2rem) clamp(1rem,3vw,1.5rem)}.calculator{width:100%;max-width:min(420px,100%);padding:clamp(1rem,3vw,1.5rem);display:flex;flex-direction:column;gap:clamp(.8rem,2.5vw,1rem);margin:auto;transition:max-width var(--transition-speed) ease}.calculator.mode-scientific{max-width:min(780px,95vw)}.mode-switcher{display:flex;gap:.5rem;background:var(--display-bg);padding:.5rem;border-radius:clamp(12px,3vw,16px);margin-bottom:clamp(.25rem,1vw,.5rem)}.mode-btn{flex:1;padding:clamp(.5rem,1.5vw,.6rem);font-family:var(--font-family);font-weight:600;font-size:clamp(.8rem, 2vw, .85rem);border:none;background:0 0;color:var(--text-secondary-color);border-radius:clamp(10px,2.5vw,12px);cursor:pointer;transition:all .2s ease}.mode-btn.active{background:var(--active-btn-bg);color:var(--text-color);box-shadow:0 2px 8px rgba(0,0,0,.1)}.display{background:var(--display-bg);border-radius:clamp(16px,4vw,20px);padding:clamp(1rem,3vw,1.25rem) clamp(1.25rem,3.5vw,1.5rem);text-align:right;display:flex;flex-direction:column;justify-content:flex-end;min-height:clamp(140px,35vw,160px);border:1.5px solid var(--glass-border);position:relative;box-shadow:inset 0 2px 10px rgba(0,0,0,.05);-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);overflow:hidden}#angle-unit-indicator,#memory-indicator{position:absolute;top:clamp(1rem,3vw,1.25rem);font-size:clamp(.8rem, 2.2vw, .9rem);font-weight:700;color:var(--text-secondary-color);opacity:0;transition:opacity .3s ease,transform .3s ease;transform:scale(.9);background:var(--function-btn-bg);padding:.25rem .5rem;border-radius:6px;pointer-events:none}#memory-indicator{left:clamp(3.5rem,15vw,4.25rem)}#angle-unit-indicator{left:clamp(7rem,25vw,8rem)}.calculator.mode-scientific #angle-unit-indicator{display:block}#angle-unit-indicator.active,#memory-indicator.active{opacity:1;transform:scale(1)}#copy-btn,#history-toggle{position:absolute;top:clamp(.85rem,2.5vw,1rem);width:clamp(36px,9vw,40px);height:clamp(36px,9vw,40px);display:flex;align-items:center;justify-content:center;font-size:clamp(.9rem, 2.5vw, 1rem);border:1.5px solid var(--glass-border);border-radius:clamp(10px,2.5vw,12px);background:var(--function-btn-bg);color:var(--icon-color);cursor:pointer;opacity:.9;transition:all .2s ease;z-index:5}#copy-btn i,#history-toggle i{pointer-events:none}#copy-btn{right:clamp(.85rem,2.5vw,1rem)}#history-toggle{left:clamp(.85rem,2.5vw,1rem)}#copy-btn:hover,#history-toggle:hover{opacity:1;background:var(--function-btn-hover);transform:scale(1.08)}.display-history{font-size:clamp(.9rem, 2.5vw, 1.05rem);color:var(--text-secondary-color);min-height:30px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500;transition:opacity .3s ease;position:absolute;top:clamp(1.4rem,3.5vw,1.6rem);left:clamp(1rem,3vw,1.5rem);right:clamp(3.5rem,10vw,4rem);text-align:right;pointer-events:none}.calculator.mode-basic .display-history{left:clamp(5.5rem,20vw,6.5rem)}.display-history:empty{opacity:0}.display-main{font-weight:600;min-height:clamp(56px,15vw,68px);overflow-x:auto;overflow-y:hidden;display:flex;align-items:center;justify-content:flex-end;letter-spacing:-.02em;color:var(--display-text);transition:font-size .2s ease-out;scrollbar-width:none}.display-main::-webkit-scrollbar{display:none}.display-main.font-size-lg{font-size:clamp(2.25rem, 6.5vw, 3.5rem)}.display-main.font-size-md{font-size:clamp(1.875rem, 5.5vw, 2.75rem)}.display-main.font-size-sm{font-size:clamp(1.625rem, 4.8vw, 2.25rem)}.controls{display:flex;flex-wrap:wrap;gap:clamp(.35rem,1vw,.4rem);justify-content:center}.control-btn{background:var(--btn-bg);border:1.5px solid var(--glass-border);color:var(--text-color);cursor:pointer;font-size:clamp(.75rem, 2vw, .8rem);padding:clamp(.6rem,1.5vw,.65rem) clamp(.55rem,1.4vw,.6rem);border-radius:clamp(10px,2.5vw,12px);font-family:var(--font-family);font-weight:600;display:flex;align-items:center;justify-content:center;white-space:nowrap;transition:all .2s ease-out;min-width:clamp(40px,10vw,44px);min-height:clamp(32px,8vw,36px)}.control-btn:hover:not(:disabled){background:var(--btn-hover-bg);transform:translateY(-1px)}.control-btn:active:not(:disabled){transform:scale(.97);background:var(--btn-active-bg)}.control-btn:disabled{opacity:.4;cursor:not-allowed}.keypads-container{display:grid;gap:clamp(.6rem,2vw,.95rem);grid-template-columns:1fr}.calculator.mode-scientific .keypads-container{grid-template-columns:5fr 4fr}.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(.6rem,2vw,.95rem)}.scientific-keypad{display:none;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr);gap:clamp(.6rem,1.5vw,.8rem)}.calculator.mode-scientific .scientific-keypad{display:grid}.keypad-btn{font-family:var(--font-family);font-size:clamp(1.3rem, 3.8vw, 1.5rem);background:var(--btn-bg);border:1.5px solid var(--glass-border);border-radius:var(--btn-radius);color:var(--text-color);cursor:pointer;display:flex;justify-content:center;align-items:center;box-shadow:0 3px 10px rgba(0,0,0,.06);user-select:none;min-height:clamp(56px,15vw,56px);font-weight:600;transition:all .25s cubic-bezier(.4, 0, .2, 1);position:relative;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);line-height:1}.scientific-keypad .keypad-btn{font-size:clamp(.9rem, 2.5vw, 1rem);min-height:clamp(44px,9.5vw,52px);font-weight:600;background:var(--function-btn-bg);color:var(--function-btn-text)}#second-fn-btn{background:var(--second-fn-btn-bg);color:var(--second-fn-btn-text);font-weight:700}.scientific-keypad .keypad-btn:hover{background:var(--function-btn-hover)}.scientific-keypad .keypad-btn.active{background:var(--operator-bg);color:var(--operator-text-color)}.keypad-btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(0,0,0,.1);background:var(--btn-hover-bg)}.keypad-btn:active{transform:scale(.98);background:var(--btn-active-bg)}.keypad-btn.function{background:var(--function-btn-bg);font-weight:600;color:var(--function-btn-text)}.keypad-btn.function:hover{background:var(--function-btn-hover)}.keypad-btn.equals,.keypad-btn.operator{border:none;font-weight:700;box-shadow:0 5px 15px rgba(0,0,0,.15)}.keypad-btn.operator{background:var(--operator-bg);color:var(--operator-text-color);font-size:clamp(1.5rem, 4.2vw, 1.75rem)}.keypad-btn.equals{background:var(--equals-bg);color:var(--equals-text-color);font-size:clamp(1.7rem, 4.8vw, 2rem)}.keypad-btn.equals:hover,.keypad-btn.operator:hover{filter:brightness(1.06);transform:translateY(-1px)}.history-panel{position:fixed;top:0;right:0;width:var(--history-width);height:100vh;height:100dvh;padding:clamp(1.5rem,4vw,2rem) clamp(1rem,3vw,1.5rem);transform:translateX(100%);transition:transform .3s cubic-bezier(.4, 0, .2, 1);display:flex;flex-direction:column;overflow:hidden;max-width:100%}.history-panel.open{transform:translateX(0)}.history-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:clamp(1rem,3vw,1.5rem)}.history-title{font-size:clamp(1.25rem, 4vw, 1.5rem);font-weight:700;color:var(--text-color)}.close-history{width:clamp(40px,10vw,48px);height:clamp(40px,10vw,48px);display:flex;align-items:center;justify-content:center;background:var(--btn-bg);border:1.5px solid var(--glass-border);border-radius:clamp(10px,3vw,14px);color:var(--icon-color);cursor:pointer;font-size:clamp(1rem, 3vw, 1.2rem);transition:all .2s ease;flex-shrink:0}.close-history:hover{background:var(--btn-hover-bg);transform:translateY(-2px)}.history-list{flex-grow:1;overflow-y:auto;list-style:none;padding-right:.5rem}.history-list::-webkit-scrollbar{width:8px}.history-list::-webkit-scrollbar-thumb{background:var(--glass-border);border-radius:4px}.history-item{padding:clamp(1.2rem,3.5vw,1.5rem);margin-bottom:clamp(.7rem,2vw,.85rem);background:var(--btn-bg);border:1.5px solid var(--glass-border);border-radius:clamp(12px,3.5vw,16px);cursor:pointer;transition:all .2s ease}.history-item:focus-visible,.history-item:hover{background:var(--btn-hover-bg);transform:translateX(-4px)}.history-expression{color:var(--text-secondary-color);font-size:clamp(.85rem, 2.3vw, .95rem);margin-bottom:.6rem;font-weight:500;word-break:break-all}.history-result{font-size:clamp(1.15rem, 3.3vw, 1.35rem);font-weight:600;word-break:break-all;color:var(--text-color)}.clear-history{width:100%;padding:clamp(.95rem,2.8vw,1.1rem);background:var(--function-btn-bg);border:1.5px solid var(--glass-border);border-radius:clamp(12px,3.5vw,16px);color:var(--function-btn-text);cursor:pointer;font-family:var(--font-family);font-size:clamp(.9rem, 2.5vw, 1rem);font-weight:600;transition:all .2s ease;margin-top:1rem}.clear-history:hover{background:var(--function-btn-hover);transform:translateY(-2px)}.overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);opacity:0;visibility:hidden;transition:all var(--transition-speed) ease;z-index:190;pointer-events:none}.overlay.active{opacity:1;visibility:visible;pointer-events:auto}.seo-content{padding:2rem clamp(1rem,5vw,3rem);max-width:800px;margin:2.5rem auto 0;border-radius:clamp(16px,4vw,24px);font-size:clamp(.9rem, 1.8vw, 1rem)}.seo-content h1,.seo-content h2,.seo-content h3{letter-spacing:-.02em;margin-bottom:1rem}.seo-content h1{font-size:clamp(1.8rem, 5vw, 2.5rem);text-align:center;margin-bottom:2rem}.seo-content h2{font-size:clamp(1.4rem, 4vw, 1.8rem);padding-bottom:.5rem;border-bottom:2px solid var(--border-subtle);margin-top:2.5rem}.seo-content h3{font-size:clamp(1.1rem, 3vw, 1.25rem)}.seo-content dl,.seo-content p,.seo-content ul{margin-bottom:1.5rem;color:var(--text-secondary-color)}.seo-content dt{font-weight:600;color:var(--text-color)}.seo-content dd{margin-left:1.5rem;margin-bottom:1rem}.seo-content strong{color:var(--text-color);font-weight:600}.seo-content ul{list-style-position:inside;padding-left:1rem}.seo-content li{margin-bottom:.75rem}.seo-content table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}.seo-content td,.seo-content th{text-align:left;padding:.8rem;border-bottom:1px solid var(--border-subtle)}.seo-content th{font-weight:600;color:var(--text-color)}.seo-content code{background:var(--btn-bg);padding:.2rem .4rem;border-radius:6px;font-size:.9em}.seo-content a{color:var(--focus-ring-color);text-decoration:none;font-weight:500}.seo-content a:hover{text-decoration:underline}.app-footer{max-width:800px;margin:2.5rem auto 0;padding:1.5rem 2rem;text-align:center;font-size:.9rem;color:var(--text-secondary-color)}.app-footer a{color:var(--text-secondary-color);cursor:pointer;text-decoration:none;font-weight:500;transition:color .2s ease}.app-footer a:hover{color:var(--text-color);text-decoration:underline}body.modal-open{overflow:hidden}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.7);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);opacity:0;visibility:hidden;transition:all var(--transition-speed) ease;z-index:1000}.modal-overlay.active{opacity:1;visibility:visible}.modal{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%) scale(.95);width:min(600px,90vw);max-height:85vh;display:flex;flex-direction:column;opacity:0;visibility:hidden;transition:all var(--transition-speed) ease;z-index:1001}.modal.active{opacity:1;visibility:visible;transform:translate(-50%,-50%) scale(1)}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.5rem;border-bottom:1.5px solid var(--glass-border)}.modal-title{font-size:1.25rem;font-weight:600}.modal-close{font-size:1.2rem;color:var(--icon-color);width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--btn-bg);border:1.5px solid var(--glass-border);border-radius:10px;cursor:pointer;transition:all .2s ease}.modal-close:hover{transform:scale(1.1);background:var(--btn-hover-bg)}.modal-body{padding:1.5rem;overflow-y:auto;font-size:.9rem}.modal-body h4{font-weight:600;color:var(--text-color);margin-top:1.25rem;margin-bottom:.5rem}.modal-body p{color:var(--text-secondary-color);margin-bottom:1rem;line-height:1.7}@media (min-width:768px){.sidebar{transform:translateX(0)}.app-body{margin-left:var(--sidebar-width)}}@media (max-width:767px){.menu-toggle{display:flex}.sidebar{padding-top:clamp(5rem,12vw,6rem)}body.history-open,body.sidebar-open{overflow:hidden}.calculator.mode-scientific .keypads-container{grid-template-columns:1fr}.calculator.mode-scientific{max-width:100%}.main-content{padding:1rem 1rem 1.5rem}}@media (min-width:1200px){body.history-open .app-body{margin-right:var(--history-width)}.history-panel.open{box-shadow:none}}@media (max-width:480px){.calculator{padding:.5rem;gap:.5rem}.keypad,.keypads-container,.scientific-keypad{gap:.4rem}.keypad-btn{min-height:clamp(48px,13vw,52px);font-size:clamp(1rem, 4.5vw, 1.2rem)}.keypad-btn.operator{font-size:clamp(1.2rem, 5vw, 1.5rem)}.scientific-keypad .keypad-btn{min-height:clamp(40px,10vw,44px);font-size:clamp(.8rem, 3vw, .9rem)}.display{padding:clamp(.75rem,2.5vw,1rem) 1rem;min-height:clamp(110px,28vw,120px)}}@media (max-height:600px) and (orientation:landscape){.main-content{padding:.5rem;justify-content:flex-start}.calculator{gap:.35rem;padding:.5rem}.display{min-height:clamp(60px,18vh,75px);padding:.5rem .8rem}.display-history,.mode-switcher{display:none}#copy-btn,#history-toggle{top:.5rem}#copy-btn{right:.5rem}#history-toggle{left:.5rem}.keypad,.scientific-keypad{gap:.3rem}.keypad-btn{min-height:clamp(34px,7.5vh,42px);border-radius:clamp(.6rem,2vh,.8rem);font-size:clamp(.9rem, 2.5vh, 1.1rem)}.scientific-keypad .keypad-btn{min-height:clamp(30px,6.5vh,36px);font-size:clamp(.7rem, 2vh, .8rem)}.controls{gap:.2rem;margin-bottom:.1rem}.control-btn{min-height:28px;font-size:.65rem;padding:.4rem .5rem}.app-footer,.seo-content{display:none}}@media (max-height:420px) and (orientation:landscape){.display{min-height:clamp(50px,16vh,60px)}.keypad-btn{min-height:clamp(30px,7vh,36px)}.scientific-keypad .keypad-btn{min-height:clamp(26px,6vh,30px)}}@media (hover:none) and (pointer:coarse){#copy-btn:active,#history-toggle:active,.clear-history:active,.close-history:active,.control-btn:active:not(:disabled),.keypad-btn:active,.menu-toggle:active,.theme-switcher:active{transform:scale(.96)}}