/* A notebook for the whole school: models are the main visual language. */
.site-header { flex-wrap: wrap; }
.site-header nav { flex-wrap: wrap; }
.profile-control { display: flex; align-items: center; gap: .55rem; font-weight: 700; }
.profile-control select { min-height: 44px; max-width: 145px; padding: .4rem .6rem; border-radius: 8px; font: inherit; background: white; color: var(--ink); }
.intro { padding-top: 3rem; padding-bottom: 2.5rem; }
.intro h1 { font-size: clamp(3rem, 6.5vw, 5.5rem); }
.working-on-skill .intro, .focus-mode .intro { display: none; }
.working-on-skill .grade-rail { padding-top: 1rem; }
.working-on-skill .grade-rail-heading p { display: none; }
.working-on-skill .grade-tab { min-height: 60px; }
.focus-mode .grade-rail, .focus-mode .data-tools, .focus-mode .site-footer { display: none; }
.hub-tabs { display: flex; flex-wrap: wrap; gap: .35rem; margin: 1.25rem 0; border-bottom: 2px solid var(--line); }
.hub-tabs button { padding: .8rem 1.1rem; min-height: 48px; background: transparent; border: 0; border-bottom: 4px solid transparent; color: var(--ink-soft); font-weight: 800; }
.hub-tabs button[aria-current] { border-bottom-color: var(--navy); color: var(--navy); background: var(--blue-soft); }
.hub-tabs button:hover { background: var(--blue-soft); }
.hub-panel { padding: 1.5rem 0 3rem; }
.section-heading, .visual-lesson-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 1.5rem; margin-bottom: 1.5rem; }
.section-heading h2 { margin: .2rem 0 .6rem; font-size: clamp(1.8rem, 3.7vw, 3rem); letter-spacing: -.04em; }
.section-heading p, .visual-lesson-heading p { max-width: 70ch; line-height: 1.6; color: var(--ink-soft); }
.section-heading > button, .visual-lesson-heading > button { flex-shrink: 0; }
.personal-dashboard { display: grid; grid-template-columns: 1.5fr 1fr; gap: 1.25rem; margin-bottom: 2.5rem; }
.next-step-card { padding: 1.75rem; border: 2px solid var(--navy); border-radius: 12px; background: white; box-shadow: 6px 6px 0 var(--blue-soft); }
.next-step-card h3, .checkup-card h3 { margin: .35rem 0 .65rem; font-size: 1.5rem; }
.next-step-card p, .checkup-card p { line-height: 1.6; }
.checkup-card { padding: 1.75rem; border-left: 3px solid var(--line); background: #edf4fb; }
.checkup-note, .small-copy { color: var(--ink-soft); font-size: 1rem; }
.daily-progress { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1.5rem; padding: .85rem 1rem; background: #e6f6ee; border-radius: 8px; }
.daily-progress span { flex: 1; }
.resume-banner { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.25rem; border: 2px dashed var(--navy); background: white; }
.resume-banner p { margin: .4rem 0 0; }
.button-row { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; }
.text-action { background: transparent; border: 0; color: var(--navy); font-weight: 800; padding: .65rem .4rem; min-height: 44px; text-decoration: underline; text-underline-offset: 3px; }
.text-action:hover { color: #0b5694; }
.mode-tabs { flex-wrap: wrap; }
.mode-tabs button { flex: 1 1 130px; min-height: 48px; }
.session-insight { padding: .75rem 1rem; margin: 0 0 1rem; border-left: 4px solid var(--grade); background: var(--blue-soft); font-weight: 700; line-height: 1.5; }
.session-insight:empty { display: none; }
.problem-topic { font-size: 1rem; color: var(--ink-soft); margin: -.5rem 0 1.25rem; }
.repair-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .75rem; margin: 1rem 0; }
.repair-actions span { color: var(--ink-soft); font-size: 1rem; }
.summary-next { margin: 1.5rem 0; padding: 1.25rem; background: white; border-left: 4px solid var(--good); }
.summary-next h4 { margin-top: 0; font-size: 1.3rem; }
.teach-back-prompt { border-top: 1px solid var(--line); padding-top: 1rem; line-height: 1.6; }
.visual-panel { margin: 1.5rem 0; }
.visual-lesson-heading h3 { margin: .4rem 0; font-size: clamp(1.5rem, 3vw, 2.1rem); }
.visual-lesson-layout { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(280px, 1fr); gap: 1.4rem; align-items: start; }
.visual-model { background: #f1f7fe; border: 2px solid #a8bfd8; border-radius: 12px; padding: 1.25rem; min-width: 0; }
.visual-model p { line-height: 1.55; }
.model-caption { font-size: 1.25rem; font-weight: 800; color: var(--navy); margin-top: 0; }
.visual-step-panel { background: white; padding: 1.5rem; border: 1px solid var(--line); border-radius: 12px; min-width: 0; }
.visual-step-dots { display: flex; gap: .6rem; padding: 0; list-style: none; margin: 0 0 1.5rem; }
.visual-step-dots li { display: grid; place-items: center; width: 40px; height: 40px; border: 2px solid var(--line); border-radius: 50%; font-weight: 800; }
.visual-step-dots li span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.visual-step-dots .current { border-color: var(--navy); background: var(--navy); color: white; }
.visual-step-dots .complete { border-color: var(--good); color: var(--good); background: var(--good-soft); }
[data-visual-form] label { display: block; font-size: 1.2rem; line-height: 1.55; }
[data-visual-form] label strong { display: block; color: var(--ink-soft); font-size: 1rem; margin-bottom: .4rem; }
[data-visual-form] .answer-input { width: 100%; margin: 1rem 0; }
[data-visual-form] .choice-answers { margin-top: 1rem; }
.visual-help-actions { display: flex; flex-wrap: wrap; gap: .3rem; margin-top: .5rem; }
.visual-feedback { margin: .75rem 0; padding: 1rem; border-left: 4px solid var(--warn); background: var(--warn-soft); line-height: 1.6; }
.visual-feedback[data-correct="true"] { background: var(--good-soft); border-color: var(--good); }
.lesson-evidence { color: var(--ink-soft); line-height: 1.6; }
.math-model-svg { display: block; width: 100%; height: auto; overflow: visible; }
.math-model-svg text { font: 18px "Avenir Next", system-ui, sans-serif; fill: var(--ink); stroke: none; }
.math-model-svg .axis-label, .math-model-svg .point-label { font-size: 14px; }
.math-model-svg path { stroke: var(--navy); fill: none; stroke-width: 2; }
.math-model-svg .jump-path { stroke: #8398af; stroke-width: 3; }
.math-model-svg .jump-path.active { stroke: #1d6ca5; stroke-width: 4; }
.math-model-svg .model-fill, .math-model-svg .clock-face { fill: #d4e7fb; stroke: var(--navy); stroke-width: 2; }
.math-model-svg .model-fill-alt { fill: #ffdeb0; stroke: var(--navy); stroke-width: 2; }
.math-model-svg .clock-hand { stroke-width: 5; stroke-linecap: round; }
.math-model-svg .plot-point { fill: #1d6ca5; stroke: white; stroke-width: 2; }
.math-model-svg .reflected-point { fill: #9b4f85; }
.counter-board { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .3rem; max-width: 355px; margin: auto; }
.counter-cell { display: grid; place-items: center; min-height: 44px; aspect-ratio: 1; border: 2px solid var(--line-strong); background: white; color: #486786; font-size: clamp(1.25rem, 3vw, 2rem); border-radius: 5px; padding: 0; }
.counter-cell.filled { color: #1d6ca5; background: #deefff; }
.counter-cell.fixed { opacity: 1; color: var(--navy); background: #c9e0f7; cursor: default; }
.model-count { text-align: center; font-weight: 700; }
.pair-board { display: flex; flex-wrap: wrap; gap: .6rem; }
.counter-pair { padding: .5rem; border: 2px solid var(--navy); border-radius: 25px; color: var(--navy); font-size: 1.6rem; }
.fraction-model-row { display: grid; grid-template-columns: 45px minmax(0, 1fr) 50px; gap: .5rem; align-items: center; margin: 1rem 0; }
.fraction-model { display: grid; grid-template-columns: repeat(var(--pieces), 1fr); height: 54px; border: 2px solid var(--navy); }
.fraction-model span { background: white; border-right: 1px solid var(--navy); }
.fraction-model span:last-child { border-right: 0; }
.fraction-model span.shaded { background: #4083b9; }
.model-controls { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1.25rem; }
.model-controls button { min-height: 44px; padding: .5rem .65rem; border: 1px solid var(--navy); border-radius: 6px; background: white; color: var(--navy); font-weight: 700; }
.model-controls button[aria-pressed="true"] { background: var(--navy); color: white; }
.array-model, .fraction-area { display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); gap: 2px; max-width: 320px; margin: auto; border: 2px solid var(--navy); padding: 2px; }
.array-model span, .fraction-area span { aspect-ratio: 1; border: 1px solid var(--navy); }
.array-model .part-one, .fraction-area .column-shade { background: #77add7; }
.array-model .part-two { background: #eebd74; }
.fraction-area .row-shade { background-image: repeating-linear-gradient(45deg, transparent, transparent 5px, rgba(20,37,61,.25) 5px, rgba(20,37,61,.25) 7px); }
.fraction-area .row-shade.column-shade { background-color: #245988; }
.place-model { display: grid; gap: .75rem; }
.place-row { display: flex; justify-content: center; gap: .2rem; }
.place-row span { display: grid; place-items: center; flex: 0 1 50px; min-height: 60px; min-width: 20px; border: 2px solid var(--line-strong); background: white; font-size: clamp(1rem, 3vw, 1.8rem); font-weight: 800; }
.place-row .decimal-point { flex-basis: 15px; border: 0; background: transparent; }
.partition-model { display: flex; min-height: 145px; gap: 3px; margin: 1.5rem 0; }
.partition-model div { display: flex; align-items: center; justify-content: center; border: 2px solid var(--navy); background: #bdd9f2; min-width: 92px; }
.partition-model div:nth-child(2) { background: #ffdeb0; }
.partition-model span { font-size: 1.15rem; font-weight: 800; padding: .5rem; }
.ratio-model { border-collapse: collapse; width: 100%; background: white; }
.ratio-model th, .ratio-model td { border: 2px solid var(--line-strong); padding: .8rem; text-align: center; }
.ratio-model th { background: var(--blue-soft); }
.balance-model { list-style: none; padding: 0; }
.balance-model li { margin: .5rem 0; padding: .85rem; text-align: center; border: 2px solid var(--line); background: white; font-size: 1.15rem; }
.balance-model .active { border-color: var(--navy); font-weight: 800; }
.balance-base { text-align: center; color: var(--navy); overflow: hidden; white-space: nowrap; }
.function-machine { display: flex; align-items: center; justify-content: space-between; gap: .3rem; margin: 2rem 0; }
.function-machine span { border: 2px solid var(--navy); border-radius: 10px; padding: .75rem .5rem; background: white; text-align: center; min-width: 0; }
.function-machine strong { display: inline-block; margin-top: .5rem; font-size: 1.5rem; }
.coin-model > div { display: flex; flex-wrap: wrap; gap: .35rem; margin: .7rem 0; }
.coin { width: 50px; height: 50px; display: grid; place-items: center; border: 3px double #52687e; border-radius: 50%; background: white; font-weight: 800; }
.learning-milestones { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin: 1.5rem 0; }
.learning-milestones > div { border-top: 4px solid var(--grade); background: white; padding: 1.25rem; }
.learning-milestones strong { display: block; font-size: 2rem; color: var(--navy); }
.learning-milestones span { display: block; line-height: 1.5; margin-top: .5rem; }
.path-explainer { background: var(--blue-soft); border-left: 4px solid var(--navy); padding: 1.25rem; margin: 1.5rem 0; }
.path-explainer h3 { margin: 0 0 .5rem; }
.path-explainer p { margin: 0; max-width: 85ch; line-height: 1.6; }
.learning-map { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.path-skill { display: flex; flex-direction: column; justify-content: space-between; gap: 1rem; background: white; border: 1px solid var(--line); border-left: 6px solid var(--grade); padding: 1.5rem; }
.path-skill.secure { border-left-color: var(--good); }
.path-skill h3 { margin: .5rem 0; }
.path-skill p { line-height: 1.5; }
.path-status { font-weight: 800; }
.foundation-link { border-top: 1px solid var(--line); padding-top: .5rem; }
.family-guide { max-width: 850px; padding: 1.5rem; margin: 2rem 0 0; background: #fff7e6; border: 1px solid #d9bd8f; }
.family-guide li { padding: .4rem 0; line-height: 1.55; }
.mistake-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.mistake-entry { padding: 1.5rem; background: white; border: 1px solid var(--line); border-top: 4px solid #bc7b30; }
.mistake-entry.repaired { border-top-color: var(--good); }
.mistake-question { font-size: 1.4rem; font-weight: 800; }
.mistake-entry details { margin: 1rem 0; line-height: 1.6; }
.mistake-entry summary { cursor: pointer; min-height: 44px; color: var(--navy); font-weight: 800; }
.empty-state { border: 2px dashed var(--line-strong); background: white; padding: 3rem 1.5rem; text-align: center; }
.teacher-layout { display: grid; grid-template-columns: 1.4fr 1fr; gap: 2rem; }
#assignment-builder { padding: 1.5rem; background: white; border: 1px solid var(--line); border-radius: 12px; }
#assignment-builder label, .assignment-result > label { display: block; font-weight: 800; margin-bottom: 1rem; }
#assignment-builder input:not([type="checkbox"]), #assignment-builder select, #assignment-link { display: block; width: 100%; min-height: 48px; padding: .7rem; margin-top: .4rem; border: 1px solid var(--line-strong); border-radius: 6px; font: inherit; color: var(--ink); background: white; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.assignment-skills { margin: 1rem 0; padding: 1rem; border: 1px solid var(--line); }
.assignment-skills legend { font-weight: 800; padding: 0 .3rem; }
.assignment-skills label { display: flex !important; gap: .75rem; align-items: flex-start; padding: .65rem .3rem; margin: 0 !important; border-bottom: 1px solid #e1eaf3; cursor: pointer; line-height: 1.45; }
.assignment-skills input { width: 22px; height: 22px; flex-shrink: 0; accent-color: var(--navy); }
.assignment-skills small { display: block; color: var(--ink-soft); font-weight: 400; font-size: .95rem; }
.teacher-guide { padding: .5rem 1rem; }
.teacher-guide h3 { font-size: 1.35rem; }
.teacher-guide li, .teacher-guide p { line-height: 1.65; margin-bottom: 1rem; }
.assignment-result { padding: 1.5rem; margin: 2rem 0; border: 2px solid var(--good); background: white; }
.inline-check { display: flex !important; gap: .7rem; align-items: center; margin-top: 1.5rem; font-weight: 500 !important; }
.inline-check input { width: 22px; height: 22px; flex-shrink: 0; }
.family-message { line-height: 1.6; padding: 1rem; background: var(--blue-soft); }
.assignment-banner { display: flex; align-items: center; gap: 2rem; justify-content: space-between; margin: 1.5rem 0; padding: 1.5rem; border: 2px solid var(--navy); background: white; }
.assignment-banner h2 { margin: .25rem 0; }
.assignment-banner p { max-width: 75ch; line-height: 1.5; }
.assignment-banner > button { flex-shrink: 0; }
.data-tools { margin: 2rem 0; border-top: 2px solid var(--line); padding: 2rem 0; }
.data-tools p { max-width: 75ch; line-height: 1.6; color: var(--ink-soft); }
.file-button { position: relative; cursor: pointer; display: inline-flex; align-items: center; min-height: 44px; }
.file-button input { position: absolute; opacity: 0; inset: 0; width: 100%; cursor: pointer; }
.file-button:focus-within { outline: 4px solid #f1b82d; outline-offset: 3px; }
#restore-preview { margin-top: 1rem; padding: 1rem; background: var(--warn-soft); }
.storage-warning { background: var(--warn-soft); border: 2px solid var(--warn); padding: 1rem; margin: 1rem 0; line-height: 1.5; }
button:disabled { cursor: default; opacity: .65; }
@media (max-width: 900px) {
  .visual-lesson-layout, .teacher-layout { grid-template-columns: 1fr; }
  .visual-model { max-width: 620px; width: 100%; margin: auto; }
  .learning-milestones { grid-template-columns: repeat(2, 1fr); }
  .site-header nav { width: 100%; }
}
@media (max-width: 640px) {
  .personal-dashboard, .learning-map, .mistake-list { grid-template-columns: 1fr; }
  .section-heading, .visual-lesson-heading, .resume-banner, .assignment-banner { flex-direction: column; }
  .section-heading > button, .visual-lesson-heading > button { flex-shrink: 1; }
  .hub-tabs { display: grid; grid-template-columns: 1fr 1fr; }
  .hub-tabs button { padding: .75rem .4rem; }
  .visual-model, .visual-step-panel { padding: 1rem; }
  .counter-cell { min-height: 40px; }
  .mode-tabs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mode-tabs button { font-size: 1rem; padding: .7rem .5rem; }
  .function-machine { gap: .2rem; }
  .function-machine span { font-size: .95rem; padding: .6rem .3rem; }
  .learning-milestones { gap: .65rem; }
  .learning-milestones > div { padding: .85rem; }
  .daily-progress { align-items: flex-start; flex-direction: column; }
  .checkup-card, .next-step-card { padding: 1.25rem; }
  .profile-control { flex: 1 1 100%; }
  .site-header .quiet-button { font-size: 1rem; }
  .partition-model div { min-width: 76px; }
  .partition-model span { font-size: 1rem; }
}
@media print {
  .packet-page { break-after: page; }
  .packet-page:last-child { break-after: auto; }
  .print-sheet .packet-page li { min-height: 1.2in; font-size: 13pt; padding-top: .15in; }
  .teacher-answer-page p { line-height: 1.6; }
  .family-print table { width: 100%; border-collapse: collapse; margin: .2in 0; }
  .family-print td, .family-print th { border: 1px solid #666; padding: 7px; text-align: left; font-size: 10pt; }
  .family-print h1 { font-size: 21pt; }
  .family-print h2 { font-size: 14pt; }
}