:root {
    --color-accent-1: #00aaff;
    --color-accent-2: #ff00aa;
    --color-accent-3: #aa00ff;
    --color-success: #88cc00;
    --color-failure: #ff0033;
    --color-debug: #ff6600;
    --color-white: #ffffff;
    --color-gray: #d6d6d6;
    --color-black: #111111;

    --color-reviews: var(--color-accent-1);
    --color-lessons: var(--color-accent-2);
    --color-selection-start: var(--color-accent-2);
    --color-selection-end: var(--color-accent-3);

    --home-card-width: 20rem;
    --kanji-chip-size: 2.5rem;
    --handles-opacity: 0.5
}

html,
body {
    height: 100%;
    margin: 0;
}

body {
    background: var(--color-white);
    color: var(--color-black);
    font-family: sans-serif;
}

.is-hidden {
    display: none;
}

.home-page {
    box-sizing: border-box;
    min-height: 100%;
    max-width: calc(4 * var(--home-card-width) + 5rem);
    margin: 0 auto;
    padding: 1rem;
}

.home-header {
    margin-bottom: 1rem;
}

.home-header-top {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(3, minmax(var(--home-card-width), 1fr));
}

.home-header-column {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 0;
}

.home-header-column-left {
    justify-self: start;
}

.home-header-column-center {
    justify-self: center;
    align-items: center;
    justify-content: center;
    min-height: 3rem;
}

.home-header-column-right {
    justify-self: end;
    align-items: flex-end;
    justify-content: center;
}

.home-link-button {
    padding: 0;
    border: 0;
    background: none;
    color: inherit;
    font: inherit;
    text-decoration: underline;
    cursor: pointer;
}

.home-header-links {
    display: inline-flex;
    gap: 2rem;
    align-items: center;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 1rem;
    overflow: auto;
    box-sizing: border-box;
    background: rgb(17 17 17 / 0.25);
}

.modal-overlay.is-hidden {
    display: none;
}

.modal-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: min(60rem, 100%);
    max-height: calc(100dvh - 2rem);
    margin: auto 0;
    padding: 1rem;
    border: 2px solid var(--color-black);
    border-radius: 1rem;
    box-sizing: border-box;
    background: var(--color-white);
}

.license-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow: auto;
}

.license-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.license-title {
    margin: 0;
    font-size: 1rem;
}

.license-text {
    margin: 0;
    padding: 1rem;
    border: 2px solid var(--color-black);
    border-radius: 1rem;
    overflow: auto;
    background: var(--color-white);
    color: var(--color-black);
    font-family: monospace;
    font-size: 0.9rem;
    line-height: 1.3;
    white-space: pre-wrap;
}

@media (max-width: 64rem) {
    .home-header-top {
        grid-template-columns: 1fr;
    }
}

.home-title {
    margin: 0 0 0.25rem;
    font-size: 1.5rem;
}

.home-message {
    margin: 0;
}

.home-link {
    color: inherit;
    text-decoration: underline;
}

.home-option {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
}

.home-option input[type="checkbox"] {
    appearance: none;
    margin: 0;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--color-black);
    border-radius: 0;
    background: var(--color-white);
    display: inline-grid;
    place-items: center;
    cursor: pointer;
}

.home-option input[type="checkbox"]::before {
    content: "";
    width: 0.5rem;
    height: 0.5rem;
    background: var(--color-black);
    transform: scale(0);
}

.home-option input[type="checkbox"]:checked::before {
    transform: scale(1);
}

.advanced-panel {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

.advanced-toggle {
    align-self: center;
    padding: 0;
    border: 0;
    background: none;
    color: var(--color-black);
    font: inherit;
    text-decoration: underline;
    cursor: pointer;
}

.advanced-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.advanced-content.is-hidden {
    display: none;
}

.advanced-layout {
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
}

.advanced-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(
        auto-fit,
        minmax(calc(var(--home-card-width) - 2rem), 1fr)
    );
}

.advanced-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-width: var(--home-card-width);
    padding: 1rem;
    border: 2px solid var(--color-black);
    border-radius: 1rem;
    background: var(--color-white);
    box-sizing: border-box;
}

.advanced-card-wide {
    min-width: 0;
}

.advanced-card-narrow {
    min-width: 0;
}

.advanced-card-narrow .advanced-form {
    flex: 1;
    justify-content: center;
}

.advanced-card-narrow .advanced-message:empty {
    display: none;
}

.danger-card {
    border-color: transparent;
    background: var(--color-failure);
    color: var(--color-white);
}

.danger-card .advanced-textarea {
    border-color: var(--color-white);
    background: var(--color-failure);
    color: var(--color-white);
}

.danger-card .advanced-textarea:focus {
    outline: none;
    box-shadow: none;
    border-color: var(--color-white);
}

.danger-card .advanced-textarea::placeholder {
    color: var(--color-white);
    opacity: 0.5;
}

.danger-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(
        auto-fit,
        minmax(calc(var(--home-card-width) - 2rem), 1fr)
    );
}

.danger-toggle {
    align-self: center;
    color: var(--color-white);
}

#ultra-danger-content {
    margin-top: 2rem;
}

.advanced-section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.advanced-title {
    margin: 0;
    font-size: 1rem;
}

.advanced-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.advanced-form-string {
    flex: 1;
}

.advanced-label {
    font-size: 0.95rem;
}

.advanced-input {
    width: 100%;
    box-sizing: border-box;
}

.advanced-inline-field {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.kanji-grouping-row {
    display: grid;
    grid-template-columns: 4rem minmax(0, 1fr);
    align-items: center;
    gap: 0.75rem;
}

@media (max-width: 56rem) {
    .advanced-layout {
        grid-template-columns: 1fr;
    }
}

#grouping-secondary-controls:not([hidden]) {
    display: block;
}

.advanced-number,
.advanced-select,
.advanced-textarea {
    border: 2px solid var(--color-black);
    border-radius: 0.75rem;
    box-sizing: border-box;
    font: inherit;
}

.advanced-number {
    width: 4rem;
    padding: 0.45rem 0.6rem;
    text-align: center;
    -moz-appearance: textfield;
}

.advanced-select {
    padding: 0.45rem 0.6rem;
    background: var(--color-white);
    color: var(--color-black);
}

.advanced-number::-webkit-outer-spin-button,
.advanced-number::-webkit-inner-spin-button {
    margin: 0;
    -webkit-appearance: none;
}

.advanced-spinner {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.advanced-step-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: 2px solid var(--color-black);
    border-radius: 999px;
    background: var(--color-white);
    color: var(--color-black);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

.advanced-ordering-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.advanced-ordering-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.advanced-ordering-label {
    flex: 1;
}

.advanced-ordering-prefix {
    font-style: italic;
    opacity: 0.5 
}

.advanced-ordering-controls {
    display: flex;
    gap: 0.5rem;
}

.advanced-textarea {
    flex: 1;
    min-height: 8rem;
    padding: 0.75rem;
    resize: vertical;
}

.advanced-message {
    min-height: 1.25rem;
    margin: 0;
    text-align: center;
}

.kanji-page {
    box-sizing: border-box;
    min-height: 100%;
    max-width: calc(4 * var(--home-card-width) + 5rem);
    margin: 0 auto;
    padding: 1rem;
}

.kanji-page .home-header {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--color-black);
}

.kanji-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.kanji-section-title {
    margin: 0;
    font-size: 1.1rem;
}

.kanji-controls-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(var(--home-card-width), 1fr));
}

.kanji-controls-actions {
    display: flex;
    justify-content: center;
}

.kanji-controls .advanced-message:empty {
    display: none;
}

.kanji-results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 2px solid var(--color-black);
}

.kanji-results-controls {
    display: flex;
    flex-direction: column;
    align-items: start;
    position: sticky;
    top: 0;
    z-index: 1;
    margin-top: -1rem;
    padding-top: 1rem;
    padding-bottom: 0.5rem;
    background: var(--color-white);
}

.kanji-results-header-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.kanji-copy-feedback {
    font-style: italic;
    opacity: 1;
    transition: opacity 0.6s ease;
}

.kanji-copy-feedback.is-fading {
    opacity: 0;
}

.kanji-copy-feedback.is-hidden {
    display: inline-block;
    visibility: hidden;
}

#kanji-results-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#kanji-results-content .kanji-lists {
    grid-template-columns: repeat(auto-fill, var(--kanji-chip-size));
    justify-content: start;
}

.kanji-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.kanji-group + .kanji-group {
    margin-top: 1rem;
}

.kanji-group-level-2 {
    margin-left: 1rem;
}

.kanji-group-level-3 {
    margin-left: 2rem;
}

.kanji-group-title {
    margin: 0;
    font-size: 1rem;
}

.kanji-lists-row {
    display: contents;
}

.kanji-lists-button {
    background: var(--color-white);
    color: var(--color-black);
    cursor: pointer;
}

.home-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, var(--home-card-width));
    justify-content: center;
}

.home-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 12rem;
    width: var(--home-card-width);
    padding: 1rem;
    border: 2px solid var(--color-black);
    border-radius: 1rem;
    box-sizing: border-box;
    background: var(--color-white);
}

.home-card.is-empty {
    background: var(--color-gray);
    border-color: transparent;
}

.home-card.is-critical {
    border-color: transparent;
    background: var(--color-failure);
    color: var(--color-white);
}

.home-card.is-critical .kanji-lists-item {
    border-color: var(--color-white);
}

.home-card-action {
    display: grid;
    grid-template-rows: auto 1fr auto;
}

.home-card-action-slot {
    min-height: 2.5rem;
}

.home-card-action-slot .home-button {
    width: 100%;
}

.home-card-action.is-empty {
    background: var(--color-gray);
}

.home-card-action.is-lessons-ready {
    border-color: transparent;
    background: var(--color-lessons);
    color: var(--color-white);
}

.home-card-action.is-reviews-ready {
    border-color: transparent;
    background: var(--color-reviews);
    color: var(--color-white);
}

.home-card-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
}

.home-card-title {
    margin: 0;
    font-size: 1.1rem;
}

.home-card-count {
    display: grid;
    margin: 0;
    place-items: center;
    font-size: 4rem;
    line-height: 1;
    text-align: center;
}

.home-card-count.is-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    line-height: 1;
    padding-inline: 1rem;
    gap: 0;
    opacity: 0.5;
    transform: translateY(0.7rem);
}

.home-card-count-lead {
    font-size: 1.25rem;
    font-weight: 400;
}

.home-card-count-value {
    position: relative;
    font-size: 2.6rem;
    font-weight: 700;
    line-height: 1;
}

.home-card-count-value.is-approx::before {
    content: "~";
    position: absolute;
    right: 100%;
    margin-right: 0.05em;
    font-weight: 400;
}

.home-card-count-unit {
    font-size: 1.25rem;
    font-weight: 700;
}

.home-card-wide {
    grid-column: 1 / -1;
}

.home-button,
.home-input {
    font: inherit;
}

.home-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: 0.6rem 0.9rem;
    border: 0;
    border-radius: 999px;
    background: var(--color-black);
    color: var(--color-white);
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
}

.danger-button {
    background: var(--color-white);
    color: var(--color-failure);
}

.home-button.is-hidden {
    display: inline-flex;
    visibility: hidden;
    pointer-events: none;
}

.home-card-action.is-lessons-ready .home-button,
.home-card-action.is-reviews-ready .home-button {
    background: var(--color-white);
}

.home-card-action.is-lessons-ready .home-button {
    color: var(--color-lessons);
}

.home-card-action.is-reviews-ready .home-button {
    color: var(--color-reviews);
}

.home-input {
    width: 3.5rem;
    min-width: 0;
    padding: 0.6rem 0.7rem;
    border: 2px solid var(--color-black);
    border-radius: 0.75rem;
    box-sizing: border-box;
    text-align: center;
}

.advanced-card-narrow .advanced-input {
    width: 100%;
    text-align: left;
}

.extra-study-form {
    display: contents;
}

.extra-study-input {
    width: 5rem;
    height: 5rem;
    padding: 0;
    font-size: 4rem;
    line-height: 1;
}

.extra-study-input::placeholder {
    opacity: 0.25;
}

.item-spread {
    align-self: center;
    display: inline-grid;
    grid-template-columns: repeat(9, auto);
    align-items: end;
    gap: 0.6rem;
    min-height: 12rem;
}

.item-spread-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}

.item-spread-value {
    font-size: 0.9rem;
    line-height: 1;
}

.item-spread-value.is-zero {
    opacity: 0.25;
}

.item-spread-bar-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: end;
    height: 9.25rem;
    gap: 0.25rem;
}

.item-spread-bar {
    width: 1.4rem;
    background: var(--color-black);
}

.item-spread-stage {
    font-size: 0.9rem;
}

.stats-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.stats-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stats-title {
    margin: 0;
    font-size: 0.95rem;
}

.stats-list {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin: 0;
}

.stats-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 0.15rem;
    border-bottom: 1px solid var(--color-gray);
}

.stats-row dt,
.stats-row dd {
    margin: 0;
}

.stats-row dd {
    font-weight: 700;
}

.kanji-lists {
    display: grid;
    grid-template-columns: repeat(5, var(--kanji-chip-size));
    gap: 0.5rem;
    justify-content: center;
    margin: 0;
    padding: 0;
    list-style: none;
}

.kanji-lists-item,
.kanji-lists-empty {
    display: grid;
    place-items: center;
    min-width: var(--kanji-chip-size);
    min-height: var(--kanji-chip-size);
    border: 2px solid var(--color-black);
    border-radius: 0.75rem;
}

.kanji-lists-item {
    font-size: 1.5rem;
    line-height: 1;
}

.kanji-lists-link {
    display: grid;
    width: 100%;
    height: 100%;
    place-items: center;
    color: inherit;
    text-decoration: none;
}

.kanji-lists-empty {
    grid-column: 1 / -1;
}

.login-page {
    display: grid;
    min-height: 100%;
    place-items: center;
}

.login-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: min(24rem, calc(100vw - 2rem));
    padding: 1rem;
    border: 1px solid var(--color-black);
    border-radius: 0.75rem;
    box-sizing: border-box;
}

.login-label {
    font-weight: 600;
}

.login-input,
.login-button {
    font: inherit;
}

.login-input {
    padding: 0.6rem 0.7rem;
    border: 1px solid var(--color-black);
}

.login-button {
    padding: 0.6rem 0.7rem;
    border: 1px solid var(--color-black);
    background: var(--color-white);
    color: var(--color-black);
}

.login-message {
    min-height: 1.25rem;
    margin: 0;
}

.review-page {
    min-height: 100%;
}

.kanji-info {
    position: fixed;
    bottom: 1rem;
    left: 1rem;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    padding: 0.65rem 0.8rem;
    border: 1px solid var(--color-gray);
    background: var(--color-white);
}

.study-home-button {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1;
    display: grid;
    width: 2.5rem;
    height: 2.5rem;
    place-items: center;
    border: 1px solid var(--color-gray);
    border-radius: 999px;
    background: var(--color-white);
    color: var(--color-black);
    font-size: 1.2rem;
    line-height: 1;
    text-decoration: none;
}

.progress-bar {
    position: fixed;
    top: 1rem;
    left: 50%;
    z-index: 1;
    width: min(calc(100vw - 4vmin), calc(100vh - 6rem - 4vmin));
    max-width: 100%;
    height: 0.6rem;
    overflow: hidden;
    transform: translateX(-50%);
    background: var(--color-gray);
}

.progress-fill {
    width: 0;
    height: 100%;
    background: var(--color-black);
}

.kanji-label {
    align-self: stretch;
    font-size: 2rem;
    line-height: 1;
    text-align: center;
}

.kanji-link {
    color: var(--color-black);
    text-decoration: none;
}

.kanji-link:hover {
    text-decoration: underline;
}

.action-tray {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    z-index: 1;
    transform: translateX(-50%);
}

.action-button {
    min-width: 10rem;
    padding: 0.9rem 1.4rem;
    border: 1px solid var(--color-gray);
    background: var(--color-white);
    color: var(--color-black);
    font: inherit;
}

.next-button.is-success {
    background: var(--color-success);
    border-color: var(--color-success);
    color: var(--color-white);
}

.next-button.is-neutral {
    background: var(--color-accent-1);
    border-color: var(--color-accent-1);
    color: var(--color-white);
}

.next-button.is-failure {
    background: var(--color-failure);
    border-color: var(--color-failure);
    color: var(--color-white);
}

.clear-button,
.home-button,
.next-button {
    z-index: 1;
}

.clear-button.is-hidden,
.home-button.is-hidden,
.next-button.is-hidden {
    display: none;
}

.review-stage {
    box-sizing: border-box;
    width: 100vw;
    height: 100vh;
    padding: 2vmin 2vmin 6rem;
    touch-action: none;
}

.review-stage.is-clickable-action {
    cursor: pointer;
}

.review-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.review-message-panel {
    display: grid;
    width: 100%;
    height: 100%;
    place-items: center;
}

.review-message {
    margin: 0;
    color: var(--color-gray);
    font-size: 1.1rem;
    text-align: center;
}

.study-grid {
    fill: none;
}

.study-grid > * {
    fill: none;
    stroke: var(--color-gray);
    stroke-width: 4px;
    vector-effect: non-scaling-stroke;
}

.stroke-base {
    fill: none;
    stroke: var(--color-gray);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.stroke-revealed {
    fill: none;
    stroke: var(--color-black);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.stroke-revealed.is-result-correct {
    filter: drop-shadow(0 0 2px var(--color-success));
}

.stroke-revealed.is-result-wrong {
    filter: drop-shadow(0 0 2px var(--color-failure));
}

.endpoint-interactable {
    cursor: pointer;
}

.endpoint-interactable.is-disabled {
    cursor: default;
}

.endpoint-hitbox-line {
    fill: none;
    stroke: transparent;
    stroke-linecap: round;
    stroke-opacity: 0;
    stroke-width: 32px;
    vector-effect: non-scaling-stroke;
    pointer-events: all;
}

.review-canvas.debug-hitboxes .endpoint-hitbox-line {
    stroke: var(--color-debug);
    stroke-opacity: 0.35;
}

.endpoint-circle {
    fill: none;
    stroke: var(--color-accent-1);
    stroke-width: 4px;
    stroke-opacity: var(--handles-opacity);
    vector-effect: non-scaling-stroke;
    pointer-events: none;
}

.endpoint-arrow-line,
.endpoint-arrow-head {
    fill: none;
    stroke: var(--color-accent-1);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-opacity: var(--handles-opacity);
    stroke-width: 4px;
    vector-effect: non-scaling-stroke;
    pointer-events: none;
}

.endpoint-interactable.is-hovered .endpoint-circle,
.endpoint-interactable.is-hovered .endpoint-arrow-line,
.endpoint-interactable.is-hovered .endpoint-arrow-head {
    stroke-width: 8px;
}

.endpoint-interactable.is-selected .endpoint-circle {
    fill: var(--selection-color);
    stroke: none;
}

.endpoint-interactable.is-selected .endpoint-arrow-line,
.endpoint-interactable.is-selected .endpoint-arrow-head {
    stroke: var(--selection-color);
}

.endpoint-interactable.is-result-correct .endpoint-circle,
.endpoint-interactable.is-result-incorrect .endpoint-circle {
    stroke: none;
}

.endpoint-interactable.is-result-correct .endpoint-arrow-line,
.endpoint-interactable.is-result-correct .endpoint-arrow-head,
.endpoint-interactable.is-result-incorrect .endpoint-arrow-line,
.endpoint-interactable.is-result-incorrect .endpoint-arrow-head {
    stroke-opacity: 1;
}

.endpoint-interactable.is-result-correct .endpoint-circle {
    fill: var(--color-success);
}

.endpoint-interactable.is-result-correct .endpoint-arrow-line,
.endpoint-interactable.is-result-correct .endpoint-arrow-head {
    stroke: var(--color-success);
}

.drag-debug-layer {
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.12s linear;
}

.drag-debug-path {
    fill: none;
    stroke: var(--color-debug);
    stroke-width: 4px;
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
}

.drag-debug-start,
.drag-debug-sampled {
    fill: var(--color-debug);
    stroke: none;
}

.drag-debug-layer .endpoint-arrow-line,
.drag-debug-layer .endpoint-arrow-head {
    stroke: var(--color-debug);
    stroke-opacity: 1;
    stroke-width: 3px;
}

.drag-debug-candidate {
    fill: none;
    stroke: var(--color-debug);
    stroke-opacity: 0.35;
    stroke-width: 2px;
    vector-effect: non-scaling-stroke;
}

.drag-debug-candidate.is-match {
    stroke: var(--color-success);
    stroke-opacity: 0.7;
    stroke-width: 3px;
}

.endpoint-interactable.is-result-circle-correct .endpoint-circle {
    fill: var(--color-success);
}

.endpoint-interactable.is-result-circle-incorrect .endpoint-circle {
    fill: var(--color-failure);
}

.endpoint-interactable.is-result-arrow-correct .endpoint-arrow-line,
.endpoint-interactable.is-result-arrow-correct .endpoint-arrow-head {
    stroke: var(--color-success);
}

.endpoint-interactable.is-result-arrow-incorrect .endpoint-arrow-line,
.endpoint-interactable.is-result-arrow-incorrect .endpoint-arrow-head {
    stroke: var(--color-failure);
}

@media (max-width: 640px) {
    .home-grid {
        grid-template-columns: var(--home-card-width);
    }

    .advanced-ordering-buttons {
        grid-template-columns: 1fr;
    }

    .extra-study-form {
        gap: 0.75rem;
    }

    .stats-card {
        grid-template-columns: 1fr;
    }
}