.sic-calculator{max-width:860px;margin:24px auto;padding:24px;border:1px solid #dfe3e8;border-radius:16px;background:#fff;color:#1f2937;box-shadow:0 8px 28px rgba(15,23,42,.06);box-sizing:border-box}.sic-calculator *{box-sizing:border-box}.sic-calculator label{display:block;font-weight:600;margin:14px 0 7px}.sic-calculator input,.sic-calculator select{width:100%;min-height:44px;padding:10px 12px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;color:#111827;font:inherit}.sic-grid,.sic-bounds{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.sic-calculate,.sic-pdf{width:100%;min-height:48px;margin-top:20px;border:0;border-radius:9px;background:#1d4ed8;color:#fff;font:inherit;font-weight:700;cursor:pointer;padding:12px}.sic-calculate:hover,.sic-pdf:hover{background:#1e40af}.sic-message{margin-top:14px;color:#166534}.sic-error{color:#b91c1c!important}.sic-result{margin-top:22px;padding:16px;background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;overflow-x:auto}.sic-answer{min-height:34px;font-size:1.1rem;overflow-x:auto}.sic-steps li{margin-bottom:10px;line-height:1.6}.sic-steps-note,.sic-note,.sic-graph-wrap p{color:#64748b;font-size:.9rem}.sic-graph{width:100%;min-height:300px;margin-top:12px}@media(max-width:600px){.sic-calculator{padding:16px}.sic-grid,.sic-bounds{grid-template-columns:1fr;gap:4px}.sic-graph{min-height:250px}}
/* Clear, textbook-style solution steps */
.sic-steps{list-style:none;padding:0;margin:18px 0;counter-reset:sic-step}
.sic-steps li.sic-step-card{counter-increment:sic-step;position:relative;margin:0 0 14px;padding:16px 18px 14px 56px;border:1px solid #dbe3ef;border-left:4px solid #2454d6;border-radius:10px;background:#fff;line-height:1.65;white-space:normal}
.sic-steps li.sic-step-card:before{content:counter(sic-step);position:absolute;left:14px;top:15px;display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:#e8efff;color:#1d4ed8;font-weight:700}
.sic-step-card h4{margin:0 0 8px;font-size:1rem;color:#172554}
.sic-step-equation{overflow-x:auto;padding:5px 0 8px;font-size:1.05rem}
.sic-step-card p{margin:4px 0 0;color:#334155;white-space:normal}

.sic-symbol-help{margin:18px 0;padding:14px;border:1px solid #dbe3ef;border-radius:12px;background:#f8fafc}.sic-symbol-help>summary,.sic-symbol-reference>summary{cursor:pointer;font-weight:750;color:#172554}.sic-help-intro{color:#64748b;font-size:.92rem;margin:10px 0}.sic-key-groups{display:grid;gap:13px}.sic-key-groups strong,.sic-examples>strong{display:block;font-size:.9rem;margin:8px 0;color:#334155}.sic-key-row{display:flex;flex-wrap:wrap;gap:7px}.sic-key-row button{border:1px solid #cbd5e1;background:#fff;color:#1e3a8a;border-radius:8px;padding:8px 11px;min-height:36px;font:inherit;cursor:pointer}.sic-key-row button:hover{background:#eaf1ff;border-color:#93b4ff}.sic-reference-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 18px;padding-top:8px}.sic-reference-grid p{font-size:.9rem;line-height:1.55;margin:7px 0;color:#334155}.sic-examples{margin:16px 0}.sic-graph-wrap{margin-top:22px}.sic-calculator code{background:#eef2ff;padding:2px 4px;border-radius:4px}@media(max-width:600px){.sic-reference-grid{grid-template-columns:1fr}.sic-key-row button{padding:8px 9px}}

/* Clearer math input and live preview */
.sic-input-help{margin:7px 0 10px;color:#526174;font-size:.92rem;line-height:1.55}.sic-input-help code{overflow-wrap:anywhere}.sic-input-preview{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:10px 0 16px;padding:12px 14px;border:1px solid #dbeafe;border-radius:9px;background:#f8fbff}.sic-input-preview>span{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;font-weight:750;color:#526174}.sic-preview-math{font-size:1.08rem;min-height:24px;overflow-x:auto;color:#172554}.sic-expression{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace!important;font-size:1rem!important}.sic-key-row button[title]{font-weight:750}


/* v2.0.9: searchable 100-question study guide */
.sic-question-bank{margin:18px 0;padding:16px;border:1px solid #d8e2f2;border-radius:12px;background:#f8faff}
.sic-question-bank h3{margin:0 0 6px;font-size:1.12rem}
.sic-question-bank p{margin:0 0 12px;color:#536985}
.sic-question-bank .sic-grid{margin:0;gap:12px}
.sic-question-bank select{width:100%;min-width:0}
.sic-bounds input[type=text]{width:100%}
@media(max-width:640px){.sic-question-bank{padding:12px}.sic-question-bank .sic-grid{grid-template-columns:1fr}}

.sic-method{display:inline-block;margin:0 0 12px;padding:6px 10px;border-radius:6px;background:#edf3ff;color:#1e4073;font-size:.92rem}
.sic-method[hidden]{display:none}

.sic-bank-download { margin: 10px 0 14px; }
.sic-bank-download a { display: inline-block; padding: 9px 13px; border: 1px solid currentColor; border-radius: 6px; font-weight: 600; text-decoration: none; }
.sic-bank-download a:hover { text-decoration: underline; }

/* v2.1.1 layout: keep the requested calculator field order and protect solution/PDF styles. */
.sic-up-calculator .sic-input-preview{margin-bottom:16px}
.sic-up-calculator .sic-bounds{margin:2px 0 16px}
.sic-up-calculator .sic-question-bank{margin-top:16px}
.sic-up-calculator .sic-calculate{margin:18px 0 18px}
.sic-up-calculator .sic-symbol-help{margin-top:8px}

/* v2.1.2: keep the answer and PDF action immediately below Calculate Integral. */
.sic-up-calculator .sic-result{margin:12px 0 18px;scroll-margin-top:20px}.sic-up-calculator .sic-result .sic-pdf{margin:10px 0 4px}.sic-up-calculator .sic-result .sic-note{margin:4px 0 16px}


/* v2.1.4: category tabs for algebra, trigonometry, calculus and matrix keypad groups */
.sic-key-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin:14px 0 10px}
.sic-key-tabs button{min-height:42px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;color:#1e293b;font:inherit;font-weight:700;cursor:pointer;padding:8px 10px}
.sic-key-tabs button.is-active{background:#e6edff;border-color:#2454d6;color:#1d3f9c}
.sic-key-tabs button:focus-visible{outline:3px solid #93b4ff;outline-offset:2px}
.sic-key-tab-note{margin:8px 0 12px;color:#64748b;font-size:.9rem;line-height:1.5}
.sic-key-groups [hidden]{display:none!important}
@media(max-width:520px){.sic-key-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}}


/* v2.1.5 CameraMath-inspired workspace layout: input, subject tabs/keypad, settings, practice, solve. */
.sic-up-calculator{max-width:1000px;margin:28px auto;padding:26px 28px;border:1px solid #e4e8ef;border-radius:18px;background:#fff;box-shadow:0 10px 34px rgba(15,23,42,.055)}
.sic-up-calculator>h2{font-size:clamp(1.55rem,3vw,2rem);font-weight:800;color:#172554;margin:0 0 12px;padding-bottom:12px;border-bottom:2px solid #e5edff}
.sic-up-calculator>p:first-of-type{font-size:1rem;line-height:1.65;color:#475569;margin:16px 0 22px}
.sic-up-calculator .sic-form>label:first-child{font-size:1.02rem;margin:0 0 8px}
.sic-up-calculator .sic-expression{min-height:52px;border:1px solid #d5deea;border-radius:11px;padding:13px 15px;font-size:1.08rem!important;background:#fff}
.sic-up-calculator .sic-input-help{margin:8px 0 10px}
.sic-up-calculator .sic-input-preview{min-height:62px;border-radius:11px;margin:12px 0 18px;padding:13px 15px}
.sic-up-calculator .sic-symbol-help{margin:16px 0 22px;padding:16px;border:1px solid #e1e7f0;border-radius:14px;background:#f8fafc}
.sic-up-calculator .sic-symbol-help>summary{font-size:1.05rem;list-style-position:inside}
.sic-up-calculator .sic-key-tabs{grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin:16px 0 18px;border:1px solid #dbe2ec;border-radius:10px;overflow:hidden;background:#fff}
.sic-up-calculator .sic-key-tabs button{border:0;border-right:1px solid #e5eaf1;border-radius:0;min-height:46px;background:#fff;color:#172554;font-weight:650}
.sic-up-calculator .sic-key-tabs button:last-child{border-right:0}
.sic-up-calculator .sic-key-tabs button.is-active{background:#e4eaf5;color:#122b59;box-shadow:inset 0 -3px 0 #315bd6}
.sic-up-calculator .sic-key-groups{padding:4px 0 2px}
.sic-up-calculator .sic-key-groups>div{margin:0 0 15px}
.sic-up-calculator .sic-key-row{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:7px}
.sic-up-calculator .sic-key-row button{min-width:0;min-height:42px;padding:8px 6px;border:1px solid #e0e5ed;border-radius:9px;background:#fff;color:#172554;font-weight:600;box-shadow:0 1px 1px rgba(15,23,42,.025)}
.sic-up-calculator .sic-key-row button:hover{background:#edf3ff;border-color:#9bb5f5}
.sic-up-calculator .sic-grid,.sic-up-calculator .sic-bounds{gap:16px;margin:14px 0}
.sic-up-calculator .sic-grid label,.sic-up-calculator .sic-bounds label{margin-top:8px}
.sic-up-calculator .sic-question-bank{margin:18px 0;padding:18px;border-radius:13px}
.sic-up-calculator .sic-examples{margin:18px 0}
.sic-up-calculator .sic-calculate{min-height:52px;margin:14px 0 12px;border-radius:10px;background:#2454d6;font-size:1.02rem}
.sic-up-calculator .sic-result{margin:10px 0 20px;padding:20px;border-radius:13px}
.sic-up-calculator .sic-pdf{background:#172554}
.sic-up-calculator .sic-graph-wrap{margin-top:22px}
@media(max-width:700px){.sic-up-calculator{padding:17px;margin:16px auto}.sic-up-calculator .sic-key-row{grid-template-columns:repeat(4,minmax(0,1fr))}.sic-up-calculator .sic-key-tabs button{font-size:.9rem;padding:7px 4px;min-height:42px}.sic-up-calculator .sic-grid,.sic-up-calculator .sic-bounds{grid-template-columns:1fr;gap:4px}}