/* Calc for Class V14.7 — TI-30XS Calculator Foundation */
.ti30-page{background:#f3f3f1}
.ti30-hero{padding:34px 0 18px;background:linear-gradient(180deg,#fff,#f3f3f1)}
.ti30-hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:end}
.ti30-hero h1{font-size:clamp(2.45rem,5vw,4.7rem);line-height:1.02;letter-spacing:-.055em;margin:14px 0}
.ti30-hero .lead{max-width:780px;margin-bottom:18px}
.ti30-hero-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:var(--shadow)}
.ti30-hero-card strong{display:block;font-size:1.05rem;margin-bottom:7px}.ti30-hero-card ul{padding-left:20px;margin:0;color:var(--muted)}
.ti30-product-nav{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 0}.ti30-product-nav a{padding:8px 13px;border:1px solid var(--line);border-radius:999px;background:#fff;font-weight:800;color:var(--blue2)}.ti30-product-nav a.active{background:var(--blue2);color:#fff;border-color:var(--blue2)}
.ti30-calculator-section{padding:16px 0 42px}.ti30-workspace{background:#fff;border:1px solid var(--line);border-radius:26px;box-shadow:var(--shadow);padding:18px;position:relative;overflow:hidden}
.ti30-workspace-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:12px}.ti30-workspace-bar strong{font-size:1.15rem}.ti30-workspace-bar small{display:block;color:var(--muted)}
.ti30-zoom-controls{display:flex;align-items:center;gap:7px;flex-wrap:wrap}.ti30-zoom-controls button{min-width:40px;height:40px;border:1px solid var(--line);background:#fff;border-radius:11px;font-weight:850;cursor:pointer}.ti30-zoom-controls button:hover{background:var(--soft)}.ti30-zoom-controls .ti30-fullscreen{background:var(--blue2);color:#fff;border-color:var(--blue2);padding-inline:14px}.ti30-zoom-label{font-weight:900;min-width:50px;text-align:center}
.ti30-stage{min-height:720px;display:grid;place-items:center;background:radial-gradient(circle at 50% 30%,#fff 0,#f7f5f2 55%,#ece9e4 100%);border:1px solid var(--line);border-radius:20px;padding:22px;overflow:auto;position:relative}
.ti30-device-wrap{transform-origin:top center;will-change:transform}.ti30-device{width:330px;background:linear-gradient(145deg,#444,#111 42%,#050505);border:7px solid #101010;border-radius:24px;padding:15px 14px 18px;box-shadow:0 28px 60px rgba(0,0,0,.32);color:#fff;position:relative}.ti30-device:before{content:"";position:absolute;inset:4px 8px auto;height:15px;border-radius:12px;background:linear-gradient(90deg,#1f1f1f,#393939,#111)}
.ti30-brandline{display:flex;justify-content:space-between;align-items:center;padding:8px 3px 9px;font-size:.76rem;color:#d7d7d7;letter-spacing:.04em}.ti30-brandline strong{font-size:.88rem;color:#fff;letter-spacing:.01em}
.ti30-screen{background:#eef4e5;color:#111;border:4px solid #252525;border-radius:6px;min-height:150px;padding:8px 9px 7px;font-family:"Courier New",ui-monospace,monospace;box-shadow:inset 0 0 0 1px #b2bba9}
.ti30-indicators{display:flex;gap:7px;flex-wrap:wrap;font-size:.62rem;font-weight:900;min-height:16px;border-bottom:1px solid #b9c0b1;padding-bottom:3px}.ti30-indicators span[hidden]{display:none}
.ti30-history{display:grid;gap:3px;min-height:78px;padding:5px 0;align-content:end}.ti30-history-line{display:flex;justify-content:space-between;gap:8px;font-size:.75rem;white-space:nowrap;overflow:hidden}.ti30-history-line span{overflow:hidden;text-overflow:ellipsis}.ti30-history-line b{font-weight:900}
.ti30-current{border-top:1px solid #b9c0b1;padding-top:5px;display:flex;align-items:flex-end;justify-content:space-between;gap:7px}.ti30-expression{min-height:28px;font-size:.9rem;overflow-wrap:anywhere;flex:1}.ti30-answer{font-size:1rem;font-weight:900;text-align:right;max-width:52%;overflow-wrap:anywhere}
.ti30-message{min-height:18px;font-size:.63rem;color:#4b5247;margin-top:2px}
.ti30-command-row{display:grid;grid-template-columns:48px 48px 1fr 48px 48px;gap:7px;align-items:center;margin:10px 0 8px}.ti30-command-row>button,.ti30-dpad button{border:1px solid #a9abad;background:#efefef;color:#111;border-radius:8px;min-height:39px;font-weight:850;font-size:.71rem;cursor:pointer;box-shadow:inset 0 -2px 0 rgba(0,0,0,.16)}.ti30-command-row .ti30-second{background:#358f35;color:#fff}.ti30-command-row .is-active{background:#ffdb6d;color:#171717;box-shadow:0 0 0 3px rgba(255,219,109,.28)}
.ti30-dpad{width:86px;height:68px;margin:auto;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);gap:2px}.ti30-dpad button{min-height:0;border-radius:50%;padding:0}.ti30-dpad .up{grid-column:2}.ti30-dpad .left{grid-column:1;grid-row:2}.ti30-dpad .down{grid-column:2;grid-row:3}.ti30-dpad .right{grid-column:3;grid-row:2}.ti30-dpad .center{grid-column:2;grid-row:2;background:#171717;color:#fff}
.ti30-keypad{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.ti30-key{position:relative;min-height:48px;border:1px solid #a9abad;border-radius:7px;background:#f6f6f6;color:#111;cursor:pointer;box-shadow:inset 0 -3px 0 rgba(0,0,0,.17);padding:13px 3px 4px;font-weight:900;line-height:1}.ti30-key:hover{filter:brightness(.96)}.ti30-key:active{transform:translateY(1px);box-shadow:inset 0 -1px 0 rgba(0,0,0,.2)}.ti30-key .secondary{position:absolute;top:4px;left:4px;color:#2d872f;font-size:.5rem;font-weight:900;line-height:1}.ti30-key .primary{font-size:.78rem}.ti30-key.number .primary{font-size:1.15rem}.ti30-key.dark{background:#1d1d1d;color:#fff;border-color:#555}.ti30-key.operator{background:#e5e5e5}.ti30-key.enter{background:#f1f1f1}.ti30-key.green{background:#4d914c;color:#fff}.ti30-key.red{background:#a51c30;color:#fff}.ti30-key.wide-label .primary{font-size:.65rem}
.ti30-status-line{color:var(--muted);font-size:.88rem;margin:10px 4px 0;min-height:1.4em}.ti30-status-line[data-kind="error"]{color:#a51c30}.ti30-status-line[data-kind="success"]{color:#26733a}
.ti30-focus-mode{overflow:hidden}.ti30-focus-mode .site-header,.ti30-focus-mode .ti30-hero,.ti30-focus-mode .site-footer,.ti30-focus-mode main>section:not(.ti30-calculator-section){display:none!important}.ti30-focus-mode .ti30-calculator-section{position:fixed;inset:0;z-index:5000;padding:0;background:#f3f3f1}.ti30-focus-mode .ti30-calculator-section>.shell{width:100%;height:100%;max-width:none}.ti30-focus-mode .ti30-workspace{width:100%;height:100%;border:0;border-radius:0;padding:max(8px,env(safe-area-inset-top)) max(8px,env(safe-area-inset-right)) max(8px,env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left));display:grid;grid-template-rows:auto minmax(0,1fr);box-shadow:none}.ti30-focus-mode .ti30-workspace-bar{margin:0 0 4px}.ti30-focus-mode .ti30-workspace-title{display:none}.ti30-focus-mode .ti30-stage{min-height:0;height:100%;border-radius:12px;padding:6px}.ti30-focus-mode .ti30-fullscreen{background:#fff;color:var(--blue2)}
.ti30-content-section{padding:44px 0}.ti30-content-section--soft{background:#ece9e4}.ti30-content-section--dark{background:linear-gradient(145deg,#1e1e1e,#293352);color:#fff}.ti30-content-section--dark p{color:#f4edca}.ti30-section-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:22px}.ti30-section-head h2{font-size:clamp(1.8rem,3.5vw,3rem);line-height:1.08;letter-spacing:-.04em;margin:6px 0 0}.ti30-section-head>p{max-width:590px;color:var(--muted);margin:0}.ti30-reading{max-width:820px}.ti30-reading h2{font-size:clamp(1.8rem,3.2vw,2.7rem);letter-spacing:-.035em}.ti30-reading p{color:var(--muted)}
.ti30-feature-grid,.ti30-example-grid,.ti30-path-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.ti30-feature-grid article,.ti30-example-grid article,.ti30-path-grid a{background:#fff;border:1px solid var(--line);border-radius:18px;padding:19px;color:var(--ink)}.ti30-feature-grid article span{display:inline-grid;place-items:center;min-width:44px;height:34px;border-radius:10px;background:var(--soft);color:var(--blue2);font-weight:900}.ti30-feature-grid h3,.ti30-example-grid h3,.ti30-path-grid h3{margin:11px 0 6px;font-size:1.08rem}.ti30-feature-grid p,.ti30-example-grid p,.ti30-path-grid p{color:var(--muted);margin:0;font-size:.92rem}.ti30-example-grid code{display:block;background:#f6f4f0;border-radius:10px;padding:9px;margin:8px 0;font-weight:800;overflow:auto}.ti30-path-grid a:hover{text-decoration:none;transform:translateY(-1px);box-shadow:0 12px 26px rgba(30,30,30,.1)}
.ti30-two-column{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:26px;align-items:start}.ti30-steps{list-style:none;padding:0;margin:18px 0}.ti30-steps li{display:grid;grid-template-columns:42px 1fr;gap:13px;margin:12px 0}.ti30-steps b{width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:var(--blue2);color:#fff}.ti30-steps p{margin:3px 0;color:var(--muted)}.ti30-side-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:21px;position:sticky;top:96px}.ti30-side-card h2{margin-top:0}.ti30-side-card dl{margin:0}.ti30-side-card div{padding:10px 0;border-bottom:1px solid var(--line)}.ti30-side-card div:last-child{border-bottom:0}.ti30-side-card dt{font-weight:900}.ti30-side-card dd{margin:3px 0 0;color:var(--muted)}
.ti30-disclosure{background:#fff9e6;border:1px solid #d8c27e;border-radius:18px;padding:18px}.ti30-disclosure p{margin:5px 0 0;color:#62532d}
.ti30-dialog{width:min(680px,calc(100% - 24px));max-height:min(82vh,760px);border:0;border-radius:22px;padding:0;box-shadow:0 28px 80px rgba(0,0,0,.32)}.ti30-dialog::backdrop{background:rgba(16,16,16,.62);backdrop-filter:blur(2px)}.ti30-dialog-inner{padding:24px}.ti30-dialog-header{display:flex;justify-content:space-between;gap:15px;align-items:center;border-bottom:1px solid var(--line);padding-bottom:13px;margin-bottom:18px}.ti30-dialog-header h2{margin:0}.ti30-dialog-close{width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:1.25rem;cursor:pointer}.ti30-dialog label{display:block;font-weight:800;margin:11px 0}.ti30-dialog input,.ti30-dialog textarea,.ti30-dialog select{width:100%;border:1px solid var(--line);border-radius:11px;padding:11px;background:#fff}.ti30-mode-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.ti30-mode-group{background:#f8f7f5;border:1px solid var(--line);border-radius:15px;padding:15px}.ti30-mode-group h3{margin:0 0 10px}.ti30-radio-row{display:flex;gap:8px;flex-wrap:wrap}.ti30-radio-row label{display:inline-flex;align-items:center;gap:5px;margin:0;padding:7px 9px;background:#fff;border:1px solid var(--line);border-radius:9px;font-size:.86rem}.ti30-dialog-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.ti30-dialog-actions button{border:0;border-radius:11px;padding:10px 14px;background:var(--blue2);color:#fff;font-weight:850;cursor:pointer}.ti30-dialog-actions button.secondary{background:#fff;color:var(--blue2);border:1px solid var(--line)}.ti30-results{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:16px}.ti30-results div{border:1px solid var(--line);border-radius:12px;padding:10px;background:#faf9f7}.ti30-results span,.ti30-results strong{display:block}.ti30-results span{font-size:.75rem;color:var(--muted)}.ti30-table-scroll{overflow:auto;max-height:330px;margin-top:14px}
.ti30-learn-hero,.ti30-practice-hero{padding:48px 0 28px;background:linear-gradient(180deg,#fff,#f3f3f1)}.ti30-learn-hero h1,.ti30-practice-hero h1{font-size:clamp(2.4rem,5vw,4.6rem);line-height:1.02;letter-spacing:-.05em;margin:14px 0}.ti30-toc{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.ti30-toc a{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 12px;font-weight:800}.ti30-lesson{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px;margin:16px 0}.ti30-lesson h2{margin-top:0}.ti30-key-sequence{display:flex;gap:7px;flex-wrap:wrap;margin:13px 0}.ti30-key-sequence kbd{background:#171717;color:#fff;border-radius:7px;padding:7px 9px;font-weight:900;box-shadow:inset 0 -2px 0 rgba(255,255,255,.15)}.ti30-note{border-left:4px solid var(--blue);background:var(--soft);padding:13px 15px;border-radius:0 12px 12px 0}.ti30-example-table{overflow:auto}.ti30-example-table table{min-width:620px}
.ti30-practice-toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.ti30-practice-toolbar button{border:1px solid var(--line);background:#fff;border-radius:11px;padding:9px 12px;font-weight:850;cursor:pointer}.ti30-practice-set{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px;margin:16px 0}.ti30-practice-set>header{display:flex;justify-content:space-between;gap:14px;align-items:center}.ti30-practice-set h2{margin:0}.ti30-problem{padding:17px 0;border-top:1px solid var(--line)}.ti30-problem:first-of-type{margin-top:12px}.ti30-problem h3{margin:0 0 8px}.ti30-answer-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.ti30-answer-row input{min-width:220px;flex:1;border:1px solid var(--line);border-radius:11px;padding:11px}.ti30-answer-row button,.ti30-hint-button,.ti30-reveal-button{border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 12px;font-weight:800;cursor:pointer}.ti30-answer-row button{background:var(--blue2);color:#fff;border-color:var(--blue2)}.ti30-feedback{min-height:1.4em;margin:7px 0;font-weight:800}.ti30-feedback.good{color:#26733a}.ti30-feedback.bad{color:#a51c30}.ti30-hint,.ti30-solution{background:#f8f7f5;border-radius:12px;padding:13px;margin-top:8px}.ti30-solution{border-left:4px solid var(--green)}
@media(max-width:980px){.ti30-feature-grid,.ti30-example-grid,.ti30-path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ti30-hero-grid,.ti30-two-column{grid-template-columns:1fr}.ti30-hero-card,.ti30-side-card{position:static;max-width:720px}.ti30-stage{min-height:680px}}
@media(max-width:700px){.ti30-hero{padding-top:28px}.ti30-hero h1{font-size:clamp(2.35rem,12vw,3.5rem)}.ti30-workspace{padding:10px;border-radius:18px}.ti30-workspace-bar{align-items:flex-start;flex-direction:column}.ti30-zoom-controls{width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:3px}.ti30-zoom-controls button{flex:0 0 auto}.ti30-stage{min-height:690px;padding:8px}.ti30-feature-grid,.ti30-example-grid,.ti30-path-grid{grid-template-columns:1fr}.ti30-section-head{align-items:flex-start;flex-direction:column}.ti30-device{width:312px}.ti30-command-row{grid-template-columns:44px 44px 1fr 44px 44px}.ti30-results{grid-template-columns:repeat(2,minmax(0,1fr))}.ti30-mode-grid{grid-template-columns:1fr}.ti30-answer-row{align-items:stretch;flex-direction:column}.ti30-answer-row input{min-width:0;width:100%}}
@media(max-width:380px){.ti30-device{width:292px;padding-inline:11px}.ti30-keypad{gap:5px}.ti30-key{min-height:45px}.ti30-command-row{gap:5px}.ti30-stage{padding-inline:2px}}
@media print{.ti30-practice-toolbar,.ti30-hint-button,.ti30-reveal-button,.ti30-answer-row button,.ti30-product-nav{display:none!important}.ti30-practice-set,.ti30-problem{break-inside:avoid}.ti30-practice-set{box-shadow:none}}