:root{color-scheme:light;--page:#f4f6f8;--surface:#fff;--surface2:#f6f8fa;--ink:#162837;--muted:#607180;--line:#dee6eb;--accent:#006d65;--accent-soft:#e1f3ef;--orange:#cc6a2b;--blue:#466ac4;--error:#b83438;--shadow:0 8px 28px #16283706;font-family:Inter,"Segoe UI",system-ui,sans-serif;font-size:15px}
*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--ink);line-height:1.5}button,input,select,textarea{font:inherit}button{cursor:pointer;touch-action:manipulation}button,a,input,select,textarea,summary{outline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #38b6a1}button{border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--ink);min-height:42px;padding:9px 14px;font-weight:600;font-size:.86rem;transition:background .12s,transform 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.optional{font-weight:400}.row{display:flex;align-items:center;flex-wrap:wrap;gap:9px}.row.between{justify-content:space-between}.row.end{justify-content:flex-end}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.stack{display:grid;gap:18px;align-content:start}.mt{margin-top:16px}.mb{margin-bottom:16px}.muted{color:var(--muted)}.primary{background:var(--accent);border-color:var(--accent);color:white}.primary:hover{background:#00574f;color:white}.ghost{background:transparent}.pill{border:1px solid var(--line);border-radius:100px;font-size:.7rem;padding:4px 8px;color:var(--muted);white-space:nowrap}.badge{display:inline-block;border-radius:5px;background:var(--accent-soft);color:var(--accent);padding:3px 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.calc-layout{display:grid;grid-template-columns:minmax(330px,1.45fr) minmax(240px,1fr);gap:22px;align-items:start}.calc-card{padding:23px}.segmented{display:inline-flex;padding:3px;background:var(--surface2);border:1px solid var(--line);border-radius:9px;gap:3px}.segmented button{border:0;background:transparent;color:var(--muted);font-size:.76rem;padding:7px 12px;min-height:34px}.segmented button[aria-pressed=true]{background:var(--surface);color:var(--ink);box-shadow:0 1px 5px #0001}.angle-select{width:auto;min-height:34px;padding:6px 25px 6px 9px;font-size:.75rem;background:var(--surface2)}.display-box{margin:20px 0 18px;padding:19px 19px 12px;background:#102d37;border-radius:13px;color:#e2edef}.display-box label{font-size:.68rem;font-weight:400;color:#94b3bd;margin-bottom:10px}.calc-input{border:0;background:transparent;border-radius:3px;color:#e4f3f4;font-size:1.1rem;text-align:right;padding:6px 0;min-height:37px}.calc-input::placeholder{color:#72929f}.calc-answer{display:block;min-height:67px;padding:9px 0 4px;text-align:right;font-size:clamp(2rem,3.5vw,2.9rem);line-height:1.25;font-weight:600;letter-spacing:-.045em;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.calc-status{font-size:.73rem;color:#9ebec6;min-height:38px;margin:10px 0 0;line-height:1.4}.calc-status.error{color:#ffc0b5}.display-actions{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:7px}.display-actions button{color:#b6ddd9;background:#ffffff0a;border:1px solid #ffffff17;min-height:28px;padding:4px 8px;font-size:.65rem}.display-actions button:hover{background:#ffffff18}.display-actions span{font-size:.7rem;color:#9ebec6;overflow-wrap:anywhere}.keypads{display:grid;gap:14px}.keys{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.keys button{min-height:52px;min-width:0;padding:6px 3px;background:var(--surface2);border:1px solid var(--line);font-size:1.12rem;font-weight:500;border-radius:10px}.keys button:hover{background:#e3eeed}.keys .operator{background:var(--accent-soft);color:var(--accent)}.keys .clear{color:#b5403b;background:#fff0ec}.keys .secondary{font-size:.94rem;color:var(--muted)}.keys .equals{grid-column:span 2;background:var(--accent);color:white;font-size:1.35rem;font-weight:600}.keys .equals:hover{background:#00574f}.science-keys{grid-template-columns:repeat(6,minmax(0,1fr));padding-bottom:14px;border-bottom:1px solid var(--line)}.science-keys button{font-size:.78rem;min-height:42px;color:var(--accent);background:var(--accent-soft);border-color:transparent}.memory-row{display:flex;gap:5px;align-items:center;margin-bottom:12px}.memory-row button{min-height:29px;font-size:.69rem;padding:5px 9px;background:var(--surface2)}.memory-row span{font-size:.66rem;color:var(--muted);margin-left:auto}.history-list{list-style:none;padding:0;margin:0;display:grid;gap:6px;max-height:340px;overflow:auto}.history-list button{width:100%;border:0;padding:10px 11px;text-align:right;background:var(--surface2);font-size:.82rem;display:block;overflow-wrap:anywhere}.history-list span{display:block;color:var(--muted);font-size:.7rem;font-weight:400;margin-bottom:4px}.history-list strong{color:var(--accent);font-size:1rem;font-weight:600}.tip-card{border-left:3px solid var(--accent);background:var(--accent-soft);padding:18px;border-radius:0 12px 12px 0;font-size:.81rem}.tip-card h3{color:var(--accent)}.tip-card p:last-child{margin-bottom:0}.quick-links{display:grid;gap:8px}.quick-links button{text-align:left;padding:12px;background:var(--surface2);font-weight:500;font-size:.78rem;display:flex;justify-content:space-between;gap:8px}.quick-links span{color:var(--muted)}
.graph-editor{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1fr) 85px auto;align-items:end;gap:10px}.function-label{display:flex;align-items:center;gap:6px}.color-dot{display:inline-block;width:8px;height:8px;border-radius:100%;background:var(--accent)}.color-dot.orange{background:var(--orange)}.color-dot.blue{background:var(--blue)}.plot-wrap{position:relative;margin-top:18px;border:1px solid var(--line);border-radius:11px;overflow:hidden;background:var(--surface)}#plot{display:block;width:100%;height:390px;touch-action:none;cursor:crosshair}.plot-foot{padding:9px 12px;font-size:.73rem;color:var(--muted);border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px;min-height:37px}.plot-toolbar button{min-height:33px;font-size:.74rem;padding:6px 10px}.ranges{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) auto;gap:9px;align-items:end;margin-top:14px}.ranges input{min-height:36px;padding:7px 9px;font-size:.82rem}.ranges label{font-size:.7rem;margin-bottom:4px}.analysis-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:18px}.analysis-grid .card{padding:19px}.analysis-grid .grid2{gap:9px}.analysis-grid .result-box{font-size:.79rem;padding:12px}.tangent-option{margin:10px 0}.plot-note{padding:9px 0 0;min-height:30px}.table-wrap{max-height:310px;overflow:auto}.table-wrap thead{position:sticky;top:0;background:var(--surface)}.constant-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.constant-card{padding:18px}.constant-card .symbol{font-family:Georgia,serif;font-size:1.7rem;color:var(--accent);font-style:italic;line-height:1.1}.constant-card h3{font-size:.85rem;margin:12px 0 6px}.constant-value{font-size:.92rem;font-weight:600;overflow-wrap:anywhere}.constant-unit{font-size:.73rem;color:var(--muted);margin:3px 0 7px}.constant-card .row button{font-size:.7rem;padding:6px 9px;min-height:33px}.constant-note{font-size:.65rem;color:var(--muted);min-height:34px;margin-bottom:12px}.unit-converter{display:grid;grid-template-columns:minmax(100px,.9fr) minmax(120px,1fr) 38px minmax(120px,1fr);gap:10px;align-items:end}.unit-converter button{padding:5px;min-height:43px}.unit-answer{font-size:1.9rem;font-weight:600;letter-spacing:-.035em;color:var(--accent);margin:22px 0 3px;overflow-wrap:anywhere}.dimension-note{font-size:.76rem;color:var(--muted)}.unit-catalog{display:flex;flex-wrap:wrap;gap:7px}.unit-catalog button{font-family:Consolas,monospace;font-size:.73rem;min-height:31px;padding:5px 8px}.formula-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.formula{font-family:Georgia,serif;font-size:1.17rem;color:var(--accent);padding:12px 0;line-height:1.8;overflow-wrap:anywhere}.formula-card ul{padding-left:20px;font-size:.8rem;color:var(--muted);margin:10px 0 0}.matrix-result{font-size:.92rem;line-height:1.9;white-space:pre;overflow:auto}.stats-chart{width:100%;height:180px;display:block;margin-top:15px}.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);padding:12px 18px;border:1px solid #a6d2c9;border-radius:10px;background:#102e38;color:white;box-shadow:0 10px 30px #0002;font-size:.8rem;z-index:20;max-width:calc(100% - 28px);text-align:center}
[data-theme=dark]{color-scheme:dark;--page:#101c27;--surface:#192936;--surface2:#203341;--ink:#e0ebee;--muted:#9fb5bf;--line:#304551;--accent:#8ce4c7;--accent-soft:#24443f;--orange:#ecaa70;--blue:#94adff;--error:#ffaaa2;--shadow:none}[data-theme=dark] .primary,[data-theme=dark] .keys .equals{color:#0d3027}[data-theme=dark] .keys button:hover{background:#35515b}[data-theme=dark] .keys .clear{background:#4b3135;color:#ffb4a9}[data-theme=dark] .result-box.error{background:#422c35;border-color:#8a4e57}[data-theme=dark] .display-box{background:#0c2029}[data-theme=dark] .segmented button[aria-pressed=true]{background:#324c5a}[data-theme=dark] .primary:hover,[data-theme=dark] .keys .equals:hover{background:#b1f2da}
@media(min-width:1500px){.content{padding-top:40px}.calc-layout{grid-template-columns:minmax(380px,1.4fr) minmax(280px,1fr)}}
@media(max-width:1150px){.app{grid-template-columns:190px minmax(0,1fr)}.sidebar{padding-left:10px;padding-right:10px}.content{padding:28px 24px}.topbar{padding:14px 24px}.calc-layout{grid-template-columns:minmax(0,1fr)}.calc-side{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.calc-side .tip-card{grid-column:span 2}.analysis-grid{grid-template-columns:minmax(0,1fr)}.analysis-grid .card{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);column-gap:20px;align-items:start}.analysis-grid .card h2,.analysis-grid .card>p:first-of-type{grid-column:1}.analysis-grid .card .result-box{grid-column:2;grid-row:1/span 5;margin-top:0}.constant-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.graph-editor{grid-template-columns:repeat(3,minmax(0,1fr))}.graph-editor .field:nth-child(4){grid-column:1}.graph-editor>button{grid-column:2/span 2}.unit-converter{grid-template-columns:repeat(3,minmax(0,1fr))}.unit-converter .field:first-child{grid-column:1/-1}.unit-converter>button{width:38px;justify-self:center}.metric-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:850px){.grid2{grid-template-columns:minmax(0,1fr)}.app{grid-template-columns:170px minmax(0,1fr)}.sidebar{padding:24px 7px 18px}.brand{padding:0 8px}.brand-mark{width:30px;height:32px}.brand strong{font-size:1.15rem}.brand span{font-size:.51rem}.navigation button{font-size:.73rem;gap:6px;padding:10px 8px}.content{padding:25px 20px}.topbar{padding:14px 20px}.formula-grid{grid-template-columns:minmax(0,1fr)}.calc-side{display:grid;grid-template-columns:minmax(0,1fr)}.calc-side .tip-card{grid-column:auto}.constant-grid{grid-template-columns:minmax(0,1fr)}.analysis-grid .card{display:block}.analysis-grid .card .result-box{margin-top:16px}.ranges{grid-template-columns:repeat(4,minmax(0,1fr))}.ranges>button{grid-column:1/-1}.metric-grid{grid-template-columns:repeat(3,minmax(0,1fr))}h1{font-size:1.65rem}}
@media(max-width:640px){.app{display:block}.sidebar{position:relative;height:auto;padding:17px 14px 0}.brand{padding:0 2px;margin:0 0 17px}.brand-mark{height:31px;width:32px}.brand strong{font-size:1.2rem}.brand span{font-size:.55rem}.nav-label,.sidebar-bottom{display:none}.navigation{display:flex;gap:5px;overflow-x:auto;margin:0 -14px;padding:0 14px 12px;scrollbar-width:thin;scrollbar-color:#44737c transparent}.navigation button{flex:0 0 auto;width:auto;min-height:37px;font-size:.75rem;padding:9px 11px}.navigation .nav-icon{display:none}.topbar{padding:11px 16px;min-height:51px}.topbar .pill{display:none}.content{padding:24px 15px 32px}.card,.calc-card{padding:18px;border-radius:13px}.panel-intro{font-size:.82rem;margin-bottom:18px}h1{font-size:1.65rem}.section-top .badge{display:none}.calc-layout{gap:16px}.display-box{padding:16px 14px 10px}.calc-answer{font-size:2.25rem}.science-keys{grid-template-columns:repeat(5,minmax(0,1fr))}.science-keys button{font-size:.74rem}.keys button{min-height:48px}.science-keys button{min-height:40px}.metric-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.graph-editor{grid-template-columns:minmax(0,1fr) 85px}.graph-editor .field:nth-child(1),.graph-editor .field:nth-child(2),.graph-editor .field:nth-child(3){grid-column:1/-1}.graph-editor .field:nth-child(4){grid-column:2;grid-row:4}.graph-editor>button{grid-column:1;grid-row:4}.plot-toolbar{gap:5px}.plot-toolbar button{font-size:.7rem;padding:6px 8px}#plot{height:300px}.ranges{grid-template-columns:repeat(2,minmax(0,1fr))}.ranges>button{grid-column:1/-1}.analysis-grid{gap:14px}.grid3{gap:8px}.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}.unit-converter{grid-template-columns:minmax(0,1fr) 32px minmax(0,1fr);gap:6px}.unit-converter select{font-size:.78rem;padding:9px 5px}.unit-converter>button{width:32px}.constant-grid{grid-template-columns:minmax(0,1fr)}.card-head{margin-bottom:15px}.calc-side{gap:16px}.small,.hint{font-size:.75rem}.result-box{font-size:.84rem}.memory-row button{padding:5px 7px}.memory-row span{font-size:.6rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* The colorful glass appearance follows the original calculator palette. */
:root[data-theme=colorful]{color-scheme:dark;--page:#202365;--surface:#17203c;--surface2:#253250;--ink:#fff5fc;--muted:#d4cee5;--line:#ffffff29;--accent:#8eeddc;--accent-soft:#68e5dc1a;--orange:#ffc06e;--blue:#b4b8ff;--error:#ffb5bc;--shadow:0 16px 42px #15072a24}
[data-theme=colorful] body{background:linear-gradient(135deg,#1a2a6c 0%,#6c287d 35%,#b21f52 65%,#d65c36 84%,#fdbb2d 115%);background-attachment:scroll}
[data-theme=colorful] .sidebar{background:linear-gradient(165deg,#172868dc,#5e2556cf);border-right:1px solid #ffffff20;backdrop-filter:blur(20px)}
[data-theme=colorful] .brand-mark{color:#fff9d4;border-color:#ffffff55;background:linear-gradient(140deg,#856aff,#e24d99 55%,#ffb15e);box-shadow:0 5px 22px #e454aa35}
.brand strong{font-size:1.12rem;letter-spacing:-.055em}.brand span{font-size:.54rem;letter-spacing:.09em}
[data-theme=colorful] .sidebar .navigation button{color:#ede4f3}[data-theme=colorful] .navigation button[aria-current=page]{background:linear-gradient(100deg,#f0c2ff26,#ffb08a22);color:#fff5ca;box-shadow:inset 3px 0 #ffcb77}
[data-theme=colorful] .nav-icon{color:#c2b9ff}[data-theme=colorful] .navigation button:nth-child(2) .nav-icon{color:#81eddf}[data-theme=colorful] .navigation button:nth-child(3) .nav-icon{color:#ffca7e}[data-theme=colorful] .navigation button:nth-child(4) .nav-icon{color:#f9a9d8}[data-theme=colorful] .navigation button:nth-child(5) .nav-icon{color:#b2d5ff}
[data-theme=colorful] .nav-label,[data-theme=colorful] .sidebar-bottom{color:#d5c4e6}[data-theme=colorful] .topbar{background:#1e194633;backdrop-filter:blur(14px)}
[data-theme=colorful] .card{background:linear-gradient(125deg,#1c264bd9,#311d43d9);border-color:#ffffff2b;backdrop-filter:blur(20px)}
[data-theme=colorful] h1{color:#fff5ed;text-shadow:0 3px 25px #33114135}[data-theme=colorful] .eyebrow{color:#ffe0a6}
[data-theme=colorful] .badge{background:#ffc47724;color:#ffe5a4}[data-theme=colorful] .pill{border-color:#ffffff38;color:#f0ddf4}
[data-theme=colorful] input,[data-theme=colorful] select,[data-theme=colorful] textarea{background:#111b37b3;border-color:#ffffff2d;color:#fff4fa}[data-theme=colorful] select option{background:#202747;color:white}
[data-theme=colorful] .segmented{background:#111a3b66}[data-theme=colorful] .segmented button[aria-pressed=true]{background:linear-gradient(110deg,#ac73e344,#ed7ca83b);color:#fff0e3}
[data-theme=colorful] .display-box{background:linear-gradient(125deg,#151e49d9,#301735d9);border:1px solid #ffffff26;box-shadow:inset 0 1px 0 #ffffff09}
[data-theme=colorful] .display-box label,[data-theme=colorful] .calc-status,[data-theme=colorful] .display-actions span{color:#d3c8e7}[data-theme=colorful] .calc-status.error{color:#ffc2a6}
[data-theme=colorful] .calc-answer{color:#fff7ce;text-shadow:0 0 25px #ffce831a}
[data-theme=colorful] .keys button{background:#ffffff0d;border-color:#ffffff19;color:#fff6ff}[data-theme=colorful] .keys button:hover{background:#ffffff24}
[data-theme=colorful] .keys .operator{color:#ffe19a;background:#ffc47213;border-color:#ffc47226}[data-theme=colorful] .keys .clear{color:#ffb0ce;background:#ff87b718}[data-theme=colorful] .keys .secondary{color:#d4c8f5}
[data-theme=colorful] .science-keys button{color:#94f1ec;background:#6beadd11;border-color:#6beadd1c}
[data-theme=colorful] .keys .equals,[data-theme=colorful] .primary{background:linear-gradient(115deg,#ffcc6c,#ff967e);border-color:#ffe0a14d;color:#45233b;box-shadow:0 4px 15px #ff95661c}[data-theme=colorful] .keys .equals:hover,[data-theme=colorful] .primary:hover{background:linear-gradient(115deg,#ffe5a8,#ffb7a4);color:#45233b}
[data-theme=colorful] .tip-card{background:linear-gradient(120deg,#6c6af13b,#ef7b9a27);border-color:#e8adff}[data-theme=colorful] .tip-card h3{color:#ffe0a7}
[data-theme=colorful] .result-box{background:#101a354d}[data-theme=colorful] .result-box.success{background:#68dfcb12;border-color:#8de9d559}[data-theme=colorful] .result-box.error{background:#ff929d14;border-color:#ff9da269;color:#ffc2bd}
[data-theme=colorful] .quick-links button,[data-theme=colorful] .history-list button,[data-theme=colorful] .memory-row button,[data-theme=colorful] .examples button{background:#ffffff09}[data-theme=colorful] .metric{background:linear-gradient(130deg,#8b75ea21,#f295b51c)}[data-theme=colorful] .metric strong{color:#ffe2ad}
[data-theme=colorful] .constant-card .symbol{color:#ffcf83}[data-theme=colorful] .constant-card:nth-child(3n+2) .symbol{color:#a8baff}[data-theme=colorful] .constant-card:nth-child(3n) .symbol{color:#8eeddc}
[data-theme=colorful] .footer{color:#f4dcee}[data-theme=colorful] .plot-wrap{background:var(--surface)}[data-theme=colorful] .plot-foot{background:#ffffff04}
@media(max-width:850px) and (min-width:641px){.brand{gap:6px;padding:0 5px}.brand strong{font-size:1rem}.brand-mark{width:25px;height:28px}.brand span{font-size:.46rem;letter-spacing:.02em}}
.legal-links{display:flex;flex-wrap:wrap;align-items:center;gap:6px 17px;margin-top:22px;border-top:1px solid var(--line);padding-top:13px}.legal-links button{padding:4px 0;border:0;background:transparent;color:var(--muted);font-size:.75rem;min-height:32px;font-weight:400}.legal-links button:hover{color:var(--accent);text-decoration:underline}.legal-links .legal-draft{font-size:.67rem;color:var(--orange)}
.legal-modal{width:min(750px,calc(100% - 28px));max-height:85vh;max-height:85svh;border:1px solid var(--line);border-radius:18px;padding:0;background:var(--surface);color:var(--ink);box-shadow:0 30px 100px #10072488;overflow:hidden}.legal-modal::backdrop{background:#110d29a6;backdrop-filter:blur(6px)}.modal-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:19px 24px;border-bottom:1px solid var(--line)}.modal-heading h2{margin:0;font-size:1.2rem}.modal-heading button{min-width:40px;padding:6px 10px;font-size:1.3rem}.modal-content{max-height:calc(85svh - 85px);overflow:auto;padding:22px 25px 27px;font-size:.86rem;line-height:1.85;overscroll-behavior:contain}.modal-content h3{margin:22px 0 6px;font-size:.95rem}.modal-content h3:first-child{margin-top:0}.modal-content p{margin-bottom:12px}.modal-content ul{padding-left:22px}.legal-placeholder{display:block;background:var(--accent-soft);border:1px dashed var(--accent);border-radius:7px;padding:11px 13px;color:var(--ink);white-space:pre-line}.draft-note{padding:13px;border:1px solid #dfae635c;background:#d7a45112;border-radius:9px;font-size:.8rem;color:var(--orange)}
@media(max-width:640px){.modal-heading{padding:15px 17px}.modal-content{padding:17px 18px 23px}.topbar{flex-wrap:wrap}.breadcrumb{font-size:.68rem}.topbar>.row{gap:6px}.brand strong{font-size:1.25rem}.brand span{font-size:.54rem}}
.chapter-guide{margin:0 0 20px;padding:8px 16px;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;background:var(--accent-soft);font-size:.81rem}.chapter-guide summary{font-size:.81rem}.chapter-guide p{line-height:1.85;max-width:940px}.chapter-guide p strong,.function-guide p strong{color:var(--ink)}.function-guide{margin-top:17px;border-top:1px solid var(--line);padding-top:6px;grid-column:1/-1}.function-guide p{line-height:1.8;font-size:.78rem}.inline-function-help{margin-top:15px;padding:13px 15px;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:8px;background:var(--accent-soft);font-size:.78rem}.inline-function-help>strong{color:var(--accent)}.inline-function-help p{margin:6px 0}.inline-function-help code{display:block;font-size:.8rem;line-height:1.7}.function-dictionary{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px 20px;align-items:start}.function-dictionary details{margin:0;padding:9px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface2)}.function-dictionary summary{font-size:.79rem}.function-dictionary p{font-size:.79rem;line-height:1.8}.function-dictionary summary code{font-size:.86rem}.brand .brand-mark,[data-theme=colorful] .brand-mark{background:none;border:0;box-shadow:none;flex-shrink:0;width:39px;height:44px}.brand-mark img{display:block;width:44px;height:44px;object-fit:contain}.brand>div:last-child{min-width:0}.brand span{display:block;line-height:1.5;font-size:.47rem;letter-spacing:.05em}.brand{gap:9px}
@media(max-width:850px) and (min-width:641px){.brand{gap:4px;padding:0 4px}.brand .brand-mark{width:26px;height:34px}.brand-mark img{width:32px;height:34px}.brand strong{font-size:.98rem}.brand span{font-size:.42rem;letter-spacing:0}}
@media(max-width:640px){.function-dictionary{grid-template-columns:minmax(0,1fr)}.chapter-guide{padding:7px 12px}.brand .brand-mark{width:33px;height:38px}.brand-mark img{width:38px;height:38px}.brand span{font-size:.52rem}.function-library{padding:17px}}
/* Alternative appearance: clear ocean blues and turquoise, with a light canvas. */
:root[data-theme=light]{--page:#deeffb;--surface:#ffffff;--surface2:#edf8fc;--ink:#123952;--muted:#496b82;--line:#bedce9;--accent:#066f88;--accent-soft:#e1f6f5;--orange:#c47726;--blue:#446ed1;--shadow:0 8px 30px #14577c0c}
[data-theme=light] body{background:linear-gradient(130deg,#d7eaff 0%,#e6f5ff 37%,#d5f6ed 100%)}
[data-theme=light] .sidebar{background:linear-gradient(165deg,#163b78 0%,#086e8d 55%,#087c73 100%);border-right:1px solid #3c9dab38}
[data-theme=light] .navigation button{color:#dbf3ff}[data-theme=light] .navigation button:hover{background:#ffffff16;color:#fff}[data-theme=light] .navigation button[aria-current=page]{background:linear-gradient(95deg,#80d8ff2e,#75f2dc26);color:#d5fff8;box-shadow:inset 3px 0 #85f3df}
[data-theme=light] .brand span,[data-theme=light] .nav-label,[data-theme=light] .sidebar-bottom{color:#c4eaf4}
[data-theme=light] .topbar{background:#f5fcffdd;backdrop-filter:blur(12px)}
[data-theme=light] .card{background:linear-gradient(125deg,#fffffffa,#f3fcfffa);border-color:#b8dce9}
[data-theme=light] .display-box{background:linear-gradient(120deg,#16366b,#075d74 67%,#0b7377);box-shadow:inset 0 1px 0 #ffffff15}
[data-theme=light] .display-box label,[data-theme=light] .calc-status,[data-theme=light] .display-actions span{color:#c4eaf6}
[data-theme=light] .calc-input,[data-theme=light] .calc-answer{color:#f2fcff}[data-theme=light] .calc-input::placeholder{color:#a3d3e5}[data-theme=light] .calc-status.error{color:#ffd1c1}
[data-theme=light] .display-actions button{color:#dbfff7;background:#ffffff12;border-color:#a8e5f633}
[data-theme=light] .primary,[data-theme=light] .keys .equals{background:linear-gradient(115deg,#185fb7,#007d83);border-color:#0c7394;color:#fff}
[data-theme=light] .primary:hover,[data-theme=light] .keys .equals:hover{background:linear-gradient(115deg,#124e9a,#006b72);color:#fff}
[data-theme=light] .keys button{background:linear-gradient(125deg,#f2f8ff,#eaf9fb);border-color:#c3e0eb}[data-theme=light] .keys button:hover{background:#d7eefb}
[data-theme=light] .keys .operator{color:#075e96;background:linear-gradient(125deg,#dceeff,#d6f5ef);border-color:#a9d8e5}
[data-theme=light] .science-keys button{color:#066b7f;background:#e0f5f7;border-color:#cae6ef}[data-theme=light] .keys .equals{background:linear-gradient(115deg,#185fb7,#007d83)}
[data-theme=light] .keys .clear{color:#a63c42;background:#fff0ee;border-color:#edcdd0}
[data-theme=light] .tip-card,[data-theme=light] .chapter-guide{background:linear-gradient(115deg,#dceeffc7,#d7f6edc7);border-color:#58b4c2}
[data-theme=light] .result-box.success{border-color:#8dcbc9;background:linear-gradient(115deg,#ecf7ff,#e5f8ef)}
[data-theme=light] .segmented button[aria-pressed=true]{color:#105e93;box-shadow:0 1px 7px #246d8a14}
[data-theme=light] .metric{background:linear-gradient(115deg,#e9f3ff,#e4f8f2)}[data-theme=light] .metric strong{color:#14568e}
[data-theme=light] button:focus-visible,[data-theme=light] a:focus-visible,[data-theme=light] input:focus-visible,[data-theme=light] select:focus-visible,[data-theme=light] textarea:focus-visible,[data-theme=light] summary:focus-visible{outline-color:#1095b3}

/* Mobile shell and installable app. Keep the established colorful identity. */
html{scroll-padding-top:80px}html.app-modal-open{overflow:hidden}body{min-height:100svh}.mobile-tabs,.mobile-keyboard-toggle,.mobile-header-actions{display:none}
.app-dialog{width:min(680px,calc(100% - 28px));max-height:90svh;border:1px solid var(--line);border-radius:22px;padding:0;background:var(--surface);color:var(--ink);box-shadow:0 24px 90px #10072488;overflow:hidden}
.app-dialog::backdrop{background:#110d29ad;backdrop-filter:blur(8px)}.app-dialog .modal-content{max-height:calc(90svh - 100px)}.app-dialog .eyebrow{margin-bottom:4px}.app-dialog .modal-heading button{flex-shrink:0;min-height:44px;min-width:44px}.app-dialog ol{padding-left:22px}.app-dialog li{margin-bottom:9px}
.tool-menu{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.tool-menu button{display:grid;grid-template-columns:30px minmax(0,1fr);align-content:center;text-align:left;padding:15px 10px;gap:2px 8px;white-space:normal;min-height:88px;background:var(--surface2)}.tool-menu button>span{grid-row:span 2;color:var(--accent);font-size:1.5rem;font-family:Georgia,serif}.tool-menu strong{font-size:.85rem}.tool-menu small{font-size:.72rem;color:var(--muted);font-weight:400}.tool-menu [aria-current=page]{border-color:var(--accent);background:var(--accent-soft)}.app-settings{display:grid;gap:10px;margin-top:22px}.pwa-status{font-size:.78rem;color:var(--muted);margin:0 0 12px}.pwa-status[data-ready=true]{color:var(--accent)}.install-hero{display:flex;gap:18px;align-items:center;margin-bottom:20px}.install-hero strong{font-size:1.45rem;letter-spacing:-.04em}.install-hero p{margin:3px 0;color:var(--muted);font-size:.82rem}.install-symbol{display:grid;place-items:center;width:76px;height:76px;border-radius:20px;background:linear-gradient(135deg,#7764ff,#ef459e,#ffab51);color:white;font:700 3rem Georgia,serif}.install-symbol img{width:64px;height:64px;object-fit:contain}.topbar [data-install]{white-space:nowrap}.keyboard-open .mobile-tabs{display:none}
@media(max-width:640px){
  :root{font-size:15px}.app{min-height:100svh}.sidebar{position:sticky;top:0;z-index:9;padding:calc(9px + env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) 9px max(16px,env(safe-area-inset-left));border-bottom:1px solid var(--line)}
  .sidebar .brand{margin:0;min-height:36px;padding:0}.brand strong{font-size:1.3rem}.brand span{font-size:.48rem}.sidebar .navigation{display:none}.sidebar .brand-mark{width:33px}.brand-mark img{width:37px;height:37px}
  .topbar{display:none}.mobile-header-actions{position:absolute;right:max(12px,env(safe-area-inset-right));top:calc(9px + env(safe-area-inset-top));display:flex;gap:6px}.mobile-header-actions button{min-height:42px;min-width:42px;padding:7px;color:var(--ink);font-size:.8rem}.sidebar .brand{padding-right:105px;min-height:42px}.topbar .breadcrumb{font-size:.73rem}.topbar .row{flex-wrap:nowrap;gap:6px}.topbar .row>button[data-go=hilfe],.topbar .pill{display:none}.topbar .row button{min-height:40px;padding:8px;font-size:.71rem}.topbar [data-install]{font-size:.68rem}
  .content{padding:20px max(12px,env(safe-area-inset-right)) calc(100px + env(safe-area-inset-bottom)) max(12px,env(safe-area-inset-left))}.content .section-top h1{font-size:1.62rem}.panel-intro{margin-bottom:14px;line-height:1.65}.card,.calc-card{padding:15px;border-radius:18px}.card-head{gap:8px}.row{gap:8px}button{min-height:44px}input,select,textarea{font-size:16px!important;min-height:46px}.inline-label input[type=checkbox]{min-height:20px;height:20px;width:20px;flex-shrink:0}.inline-label{min-height:44px}.angle-select{max-width:128px;font-size:.78rem!important;min-height:40px}
  #panel-rechner{display:flex;flex-direction:column}#panel-rechner>.panel-intro{display:none}#panel-rechner>.calc-layout{order:1}#panel-rechner>.chapter-guide-wrap{order:2;margin-top:16px}
  .segmented{gap:0;padding:2px}.segmented button{padding:7px 8px;min-height:40px;font-size:.73rem}.calc-card>.row:first-child{gap:6px}.display-box{margin:14px 0 12px;padding:12px 13px 10px}.display-box label{margin:0;font-size:.66rem}.calc-input{min-height:38px;font-size:17px!important}.calc-answer{min-height:55px;padding-top:6px;font-size:2.2rem}.calc-status{min-height:30px;margin-top:7px;font-size:.72rem}.display-actions button{min-height:36px;font-size:.68rem}.display-actions{flex-wrap:wrap;gap:5px}.display-actions .row{gap:6px}.display-actions>span:empty{display:none}.display-actions .mobile-keyboard-toggle{margin:0}.keys{gap:7px}.basic-keys button{min-height:clamp(44px,5.7svh,52px);font-size:1.2rem;border-radius:13px}.science-keys{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;padding-bottom:12px}.science-keys button{min-height:44px;font-size:.84rem;border-radius:10px}.memory-row{flex-wrap:wrap;gap:5px}.memory-row button{min-height:40px;min-width:43px}.memory-row span{font-size:.68rem}.mobile-keyboard-toggle{display:inline-flex;align-items:center;justify-content:center;margin-top:10px;gap:6px;padding:7px 9px;min-height:36px;font-size:.73rem;background:#ffffff0d;border-color:#ffffff30;color:#e9f7ff}.mobile-keyboard-toggle[aria-pressed=true]{background:#ffffff26}.calc-card>.row.mt{margin-top:10px}.calc-card .tool-link{min-height:44px;font-size:.77rem}.calc-side{margin-top:2px}.chapter-guide{margin-bottom:16px}.tool-panel[id=panel-rechner]>.chapter-guide{margin-bottom:12px}.plot-toolbar button,.examples button,.unit-catalog button{min-height:44px}.plot-toolbar{gap:7px}.ranges input{min-height:46px}.graph-editor{gap:12px}.graph-editor>button{min-height:46px}#plot{height:330px}.plot-foot{font-size:.72rem}.constant-card .row button{min-height:44px}.formula{font-size:1.07rem}.footer{font-size:.72rem}.legal-links button{min-height:44px}.hint{font-size:.78rem}
  .mobile-tabs{position:fixed;z-index:10;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;padding:7px max(9px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(9px,env(safe-area-inset-left));border-top:1px solid var(--line);background:#171b3bf2;backdrop-filter:blur(22px);box-shadow:0 -8px 30px #140d281c}
  .mobile-tabs button{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:1px;min-height:53px;background:transparent;border-color:transparent;border-radius:13px;padding:4px;color:#ddd6ed;font-size:.69rem;font-weight:500}.mobile-tabs button>span{font-size:1.4rem;line-height:1.1;font-family:Consolas,monospace}.mobile-tabs button[aria-current=page]{background:linear-gradient(125deg,#ad79ff38,#ff6ba42b);color:#fff;border-color:#e2b6ff3d}.mobile-tabs button[aria-current=page]>span{color:#9af5df}
  [data-theme=light] .mobile-tabs{background:#f4fcfff5}[data-theme=light] .mobile-tabs button{color:#3b657e}[data-theme=light] .mobile-tabs button[aria-current=page]{background:linear-gradient(125deg,#d7eaff,#c9f4e9);color:#084e78;border-color:#a7d9e5}[data-theme=light] .mobile-tabs button[aria-current=page]>span{color:#087d86}
  .app-dialog,.legal-modal{width:100%;max-width:100%;max-height:calc(100svh - env(safe-area-inset-top) - 12px);margin:auto 0 0;border-radius:24px 24px 0 0;border-bottom:0}.app-dialog .modal-content,.legal-modal .modal-content{max-height:calc(100svh - env(safe-area-inset-top) - 112px);padding:16px 16px calc(24px + env(safe-area-inset-bottom));font-size:.9rem}.modal-heading{padding:16px}.modal-heading h2{font-size:1.15rem}.modal-heading button{min-width:44px;min-height:44px}.tool-menu{gap:9px}.tool-menu button{grid-template-columns:24px minmax(0,1fr);min-height:108px;padding:12px 9px;gap:5px 6px}.tool-menu strong{font-size:.81rem}.tool-menu small{font-size:.69rem;line-height:1.5}.tool-menu button>span{font-size:1.35rem}.toast{bottom:calc(88px + env(safe-area-inset-bottom));z-index:15}
}
@media(max-width:360px){.angle-select{max-width:110px;font-size:.71rem!important}.segmented button{font-size:.68rem;padding:6px}.content{padding-left:10px;padding-right:10px}.calc-card{padding:12px}.topbar .breadcrumb{max-width:44%;font-size:.68rem}.topbar .row{gap:4px}.topbar .row button{font-size:.65rem;padding:6px}.tool-menu{grid-template-columns:minmax(0,1fr)}.tool-menu button{min-height:76px}.tool-menu small{font-size:.75rem}.tool-menu strong{font-size:.87rem}}
@media(display-mode:standalone){.app{min-height:100dvh}body{overscroll-behavior-y:none}}
.calc-stage{display:contents}.calc-identity{display:none}.install-symbol{background:none;box-shadow:none}
@media(max-width:640px){
  html.mobile-calculator{scroll-padding-top:8px}
  .mobile-calculator .sidebar,.mobile-calculator #panel-rechner>.section-top{display:none}
  .mobile-calculator .content{padding-top:calc(8px + env(safe-area-inset-top));padding-left:max(8px,env(safe-area-inset-left));padding-right:max(8px,env(safe-area-inset-right))}
  .mobile-calculator .calc-card{padding:0;border:0;border-radius:0;background:none;box-shadow:none}
  .mobile-calculator .calc-stage{display:flex;flex-direction:column;padding:12px;gap:0;border:1px solid var(--line);border-radius:20px;background:var(--surface);box-shadow:var(--shadow);height:calc(100svh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 16px);min-height:520px}
  .mobile-calculator .calc-stage>.row:first-child{flex-shrink:0;gap:6px}
  .mobile-calculator .calc-stage .display-box{position:relative;flex-shrink:0;margin:10px 0;padding:10px 12px 8px}
  .mobile-calculator .calc-identity{position:absolute;top:7px;right:11px;display:flex;align-items:center;gap:4px;color:#e9f6ff;font-size:.65rem;font-weight:600;line-height:20px}
  .calc-identity img{width:22px;height:22px;object-fit:contain}
  .mobile-calculator .display-box label{padding-right:110px;min-height:24px;display:flex;align-items:center}
  .mobile-calculator .calc-input{min-height:32px}
  .mobile-calculator .calc-answer{--answer-max:2.7rem;min-height:48px;font-size:clamp(1.45rem,calc((100vw - 80px) / var(--answer-length,10) * 1.6),var(--answer-max));padding-top:2px}
  .mobile-calculator .calc-status{min-height:20px;margin-top:5px;font-size:.68rem}
  .mobile-calculator .display-actions button{min-height:32px;padding:5px 8px}
  .mobile-calculator .display-actions{margin-top:4px}
  .mobile-calculator .keypads{display:flex;flex-direction:column;flex:1;min-height:0;gap:10px}
  .mobile-calculator .basic-keys{flex:1;grid-template-rows:repeat(6,minmax(44px,1fr));gap:6px}
  .mobile-calculator .basic-keys button{min-height:44px;height:100%;font-size:1.4rem}
  .mobile-calculator .science-keys{flex-shrink:0}
  .mobile-calculator .calc-stage:has(#scienceKeys:not([hidden])){height:auto;min-height:calc(100svh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 16px)}
  .mobile-calculator .memory-row{flex-shrink:0}
  .mobile-calculator .calc-card>.row.mt{margin-top:14px;padding:0 8px}
  .mobile-calculator .calc-card>details{padding:0 8px}
  .mobile-tabs{transition:transform 260ms cubic-bezier(.2,.7,.2,1),opacity 220ms ease,visibility 0s linear;will-change:transform}
  .mobile-calculator:not(.mobile-nav-visible) .mobile-tabs{transform:translateY(110%);opacity:0;visibility:hidden;pointer-events:none;transition:transform 260ms cubic-bezier(.2,.7,.2,1),opacity 220ms ease,visibility 0s linear 260ms}
  .mobile-nav-visible .mobile-tabs{transform:translateY(0);opacity:1;visibility:visible;pointer-events:auto}
  .mobile-calculator .toast{bottom:calc(18px + env(safe-area-inset-bottom))}
  .mobile-calculator.mobile-nav-visible .toast{bottom:calc(88px + env(safe-area-inset-bottom))}
}
@media(max-width:640px) and (max-height:620px){
  .mobile-calculator .calc-stage{padding:8px;border-radius:16px;min-height:510px}
  .mobile-calculator .calc-stage .display-box{margin:6px 0;padding:8px 10px 6px}
  .mobile-calculator .calc-answer{--answer-max:2.1rem;min-height:38px}
  .mobile-calculator .basic-keys{gap:5px}
}
@media(prefers-reduced-motion:reduce){.mobile-tabs{transition:none!important}}