/* Tool pages: input forms + step-by-step solutions */
.tool { margin: 8px 0 32px; padding: 20px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.tool-form__hint { color: var(--c-text-2); font-size: .95rem; margin-bottom: 14px; }
.tool-form__rows { display: grid; gap: 10px; }
.tool-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 4px; }
.tool-row__cell { display: inline-block; }
.tool-row__cell input { width: 72px; height: 44px; padding: 0 10px; border-radius: 10px; border: 1px solid var(--c-border); background: var(--c-bg); color: var(--c-text); font: 600 1.05rem var(--font-mono); text-align: center; -moz-appearance: textfield; }
.tool-row__cell input::-webkit-outer-spin-button, .tool-row__cell input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.tool-row__cell input:focus { border-color: var(--c-accent); box-shadow: 0 0 0 3px var(--c-accent-soft); outline: none; }
.tool-row__var { font-family: var(--font-mono); font-weight: 600; font-style: italic; font-size: 1.05rem; margin-right: 4px; }
.tool-row__op { color: var(--c-muted); font-weight: 600; padding-inline: 2px; }
.tool-row__op--eq { margin-left: 6px; font-family: var(--font-mono); color: var(--c-text); }
.tool-row--quadratic .tool-row__cell input { width: 84px; }
.tool-form__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
@media (max-width: 480px) {
  .tool { padding: 14px; }
  .tool-row { gap: 6px 2px; }
  .tool-row__cell input { width: 54px; height: 42px; padding: 0 6px; font-size: .98rem; }
  .tool-row--quadratic .tool-row__cell input { width: 64px; }
  .tool-row__var { font-size: .98rem; margin-right: 2px; }
  .tool-row__op { padding-inline: 1px; }
}

.tool-result { margin-top: 20px; padding-top: 18px; border-top: 1px dashed var(--c-border); position: relative; }
.tool-result[hidden] { display: none; }
.mto-steps { display: grid; gap: 16px; }
.mto-steps__section { padding: 14px 16px; background: var(--c-bg); border-radius: var(--radius-sm); border: 1px solid var(--c-border); }
.mto-steps__section--result { background: var(--c-success-soft); border-color: transparent; }
.mto-steps__section--note { background: var(--c-warn-soft); border-color: transparent; }
.mto-steps__title { margin: 0 0 8px; font-weight: 700; font-size: 1rem; }
.mto-steps__body p { margin: 0 0 .6em; font-size: .97rem; }
.mto-steps__body p:last-child { margin-bottom: 0; }
.mto-steps__list { margin: 0; padding-left: 1.3em; }
.mto-steps__list li { margin-bottom: .4em; }
.mto-eq { font-family: var(--font-mono); font-size: .97rem; line-height: 1.7; overflow-x: auto; }
.mto-eq strong { color: var(--c-accent-2); }
.math { font-family: var(--font-mono); }
.ok { color: var(--c-success); font-weight: 600; }
.bad { color: var(--c-danger); font-weight: 600; }
.mto-matrix { border-collapse: collapse; margin: 6px 0 12px; font-family: var(--font-mono); font-size: .95rem; display: inline-table; border-left: 2px solid var(--c-text); border-right: 2px solid var(--c-text); border-radius: 6px; }
.mto-matrix td { padding: 3px 10px; text-align: right; min-width: 2.6em; }
.mto-matrix__rhs { border-left: 1px dashed var(--c-muted); }
.mto-det { display: inline-block; vertical-align: middle; }
.mto-det .mto-matrix { margin: 0; border-radius: 0; }
.mto-det-line { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 6px 0 10px; font-family: var(--font-mono); }
.mto-steps__actions { margin-top: 14px; display: flex; gap: 8px; flex-wrap: wrap; }
.tool-form__actions--secondary { margin-top: 10px; }
.tool-form__actions--secondary + .tool-form__actions { margin-top: 12px; }
.tool-row[hidden] { display: none; }
.tool-row__select { height: 44px; padding: 0 10px; border-radius: 10px; border: 1px solid var(--c-border); background: var(--c-bg); color: var(--c-text); font: 600 .98rem var(--font); }
.tool-row__select--wide { min-width: 220px; }
.tool-row__cell--wide input { width: 96px; }
.tool-form__mode { margin-bottom: 12px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.tool-form__mode label { font-weight: 600; font-size: .95rem; }
[data-mode][hidden] { display: none !important; }
.tool-row__text { font-family: var(--font-mono); font-weight: 600; font-size: 1.05rem; }
.tool-row__sqrt { font-family: var(--font-mono); font-weight: 600; font-size: 1.15rem; margin-right: -2px; }
.tool-row__frac { display: inline-grid; grid-template-rows: auto auto; justify-items: center; gap: 4px; vertical-align: middle; }
.tool-row__frac > :first-child { border-bottom: 2px solid var(--c-text); padding-bottom: 4px; }
.tool-row__frac .tool-row { flex-wrap: nowrap; }
/* Geometry tool */
.geo { display: grid; gap: 18px; align-items: start; }
@media (min-width: 640px) { .geo { grid-template-columns: 240px minmax(0, 1fr); } }
.geo__figure { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius-sm); padding: 8px; }
.geo-svg { width: 100%; height: auto; display: block; }
.geo-fill { fill: var(--c-accent-soft); stroke: var(--c-border); stroke-width: 1.5; }
.geo-edge { stroke: var(--c-muted); stroke-width: 2.5; stroke-linecap: round; transition: stroke .15s; }
.geo-edge--dash { stroke-dasharray: 5 4; stroke-width: 2; }
.geo-ring { fill: none; stroke: transparent; stroke-width: 3; }
.geo-angle { fill: none; stroke: var(--c-muted); stroke-width: 2; }
.geo-dot { fill: var(--c-text); }
.geo-label { font: 600 15px var(--font-mono); fill: var(--c-muted); text-anchor: middle; transition: fill .15s; }
.geo-label--big { font-size: 20px; fill: transparent; }
.geo-edge.is-active, .geo-angle.is-active { stroke: var(--c-accent); }
.geo-ring.is-active { stroke: var(--c-accent); }
.geo-label.is-active { fill: var(--c-accent); }
.geo-label--big.is-active { fill: var(--c-accent); }
.geo__fields { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); margin-bottom: 12px; }
.geo-field { display: grid; gap: 4px; }
.geo-field__label { font-size: .88rem; color: var(--c-text-2); font-weight: 500; }
.geo-field__wrap { display: flex; align-items: center; border: 1px solid var(--c-border); border-radius: 10px; background: var(--c-bg); overflow: hidden; }
.geo-field__wrap:focus-within { border-color: var(--c-accent); box-shadow: 0 0 0 3px var(--c-accent-soft); }
.geo-field__wrap input { flex: 1; min-width: 0; height: 44px; border: 0; background: transparent; padding: 0 12px; font: 600 1.05rem var(--font-mono); color: var(--c-text); outline: none; }
.geo-field__unit { padding: 0 12px; height: 44px; display: flex; align-items: center; background: var(--c-surface-2); color: var(--c-muted); font-size: .9rem; font-weight: 600; border-left: 1px solid var(--c-border); }
.mto-conv td:last-child { font-family: var(--font-mono); text-align: right; }
.mto-conv tr.is-hot td { font-weight: 700; color: var(--c-accent-2); }
/* Grade tools */
.grade-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); margin-bottom: 12px; }
.grade-grid .geo-field--full { grid-column: 1 / -1; }
.grade-grid .geo-field__wrap input { font-family: var(--font); }
.grade-grid .tool-row__select { height: 44px; width: 100%; }
.grade-group { margin: 12px 0 6px; font-weight: 700; font-size: .95rem; color: var(--c-text-2); }
.grade-table-wrap { overflow-x: auto; margin-bottom: 12px; }
.grade-table { border-collapse: collapse; width: 100%; font-size: .92rem; }
.grade-table th, .grade-table td { border: 1px solid var(--c-border); padding: 4px; text-align: center; }
.grade-table th { background: var(--c-surface-2); font-weight: 600; white-space: nowrap; }
.grade-table input { width: 100%; min-width: 64px; height: 38px; border: 1px solid transparent; border-radius: 8px; background: var(--c-bg); color: var(--c-text); font: 600 .95rem var(--font-mono); text-align: center; }
.grade-table td:first-child input { min-width: 96px; font-family: var(--font); text-align: left; padding-left: 8px; }
.grade-table input:focus { border-color: var(--c-accent); outline: none; }
.mto-ladders { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 8px; }
.mto-ladder-wrap { display: inline-flex; flex-direction: column; align-items: center; gap: 4px; }
.mto-ladder-title { font-family: var(--font-mono); font-weight: 700; color: var(--c-muted); font-size: .85rem; }
.mto-steps table.mto-ladder { margin: 4px 0 8px; }
.mto-steps table.mto-ladder td { font-family: var(--font-mono); text-align: right; min-width: 3em; padding: 2px 10px; }
.mto-steps table.mto-ladder td:first-child { border-right: 2px solid var(--c-text); }
.mto-horner { border-collapse: collapse; margin: 8px 0 12px; font-family: var(--font-mono); font-size: .95rem; }
.mto-horner th, .mto-horner td { padding: 4px 10px; text-align: right; }
.mto-horner th { text-align: left; color: var(--c-muted); font-weight: 600; white-space: nowrap; }
.mto-horner__sum td { border-top: 2px solid var(--c-text); font-weight: 700; }
.mto-horner__rem { color: var(--c-success); }
.mto-steps table.mto-formula { border-collapse: collapse; margin: 6px 0 10px; font-size: .95rem; }
.mto-steps table.mto-formula td, .mto-steps table.mto-formula th { border: 1px solid var(--c-border); padding: 4px 10px; }
.mto-steps__toast { position: absolute; right: 0; bottom: -4px; margin: 0; font-size: .82rem; color: var(--c-success); opacity: 0; transition: opacity .2s; }
.mto-steps__toast.is-show { opacity: 1; }
.mto-steps__toast.is-error { color: var(--c-danger); }