@import url("https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Source+Serif+4:opsz,wght@8..60,400;8..60,600&display=swap");

:root {
    --aid-panel: #f5f5f5;
    --aid-paper: #ffffff;
    --aid-ink: var(--color-text);
    --aid-muted: #6f6b67;
    --aid-added: #b9f5c2;
    --aid-removed: #ffc4b7;
    --aid-border: 1px solid var(--color-border-light);
    --aid-editor-border: 1px solid #c9c6c2;
    --aid-focus: 0 0 0 3px rgba(225, 77, 42, 0.18);
    --aid-font: "Share Tech Mono", monospace;
    --aid-prose-font: "Source Serif 4", serif;
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    padding: clamp(1rem, 3vw, 2.5rem);
    border: var(--border-width) solid var(--color-theme);
    background-color: var(--color-bg);
    background-image: radial-gradient(rgba(253, 132, 31, 0.08) 1.5px, transparent 1.5px);
    background-size: 24px 24px;
    background-attachment: fixed;
    color: var(--aid-ink);
    font-family: var(--font-body);
    line-height: 1.6;
}

button,
textarea {
    color: inherit;
    font: inherit;
}

button {
    border: 0;
    background: transparent;
    cursor: pointer;
}

.writing-aid {
    width: min(100%, 1100px);
    margin: 0 auto;
}

.tool-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--color-border-light);
}

.wordmark {
    display: inline-flex;
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    box-shadow: 4px 4px 0 rgba(0, 18, 83, 0.12);
    font-family: var(--font-header);
    font-size: 18px;
    line-height: 30px;
    letter-spacing: -0.02em;
    text-decoration: none;
    transition: box-shadow 160ms ease, transform 160ms ease;
}

.wordmark:hover {
    color: var(--color-accent);
    box-shadow: 2px 2px 0 rgba(0, 18, 83, 0.12);
    transform: translate(2px, 2px);
    text-decoration: none;
}

.wordmark span {
    padding: 0 7px;
    background: var(--color-primary);
    color: #ffffff;
}

.wordmark b {
    padding: 0 7px;
    font-weight: 600;
}

.local-note {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 0.3rem 0.65rem;
    border: var(--aid-border);
    border-radius: 999px;
    background: var(--aid-panel);
    color: var(--aid-muted);
    font-size: 14px;
}

.local-note span {
    width: 8px;
    height: 8px;
    border: 1px solid #318a42;
    background: var(--aid-added);
}

.editors {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr);
    gap: 14px;
    align-items: center;
    padding: 1.5rem;
    border: var(--aid-border);
    border-radius: var(--radius-md);
    background: var(--aid-panel);
    box-shadow: var(--shadow-md);
}

.editor-heading,
.result-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
}

.editor-heading {
    margin-bottom: 8px;
}

.editor-heading label {
    color: var(--color-accent);
    font-family: var(--font-header);
    font-size: 15px;
    font-weight: 600;
}

.editor-heading output {
    color: var(--aid-muted);
    font-family: var(--aid-font);
    font-size: 13px;
}

textarea {
    display: block;
    width: 100%;
    min-height: 260px;
    resize: vertical;
    padding: 12px;
    border: var(--aid-editor-border);
    border-radius: var(--radius-sm);
    outline: 0;
    background: var(--aid-paper);
    font-family: var(--aid-prose-font);
    font-size: 17px;
    line-height: 1.6;
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

textarea:focus {
    border-color: var(--color-primary);
    box-shadow: var(--aid-focus);
}

textarea::placeholder {
    color: #858585;
}

.editor-actions {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-top: 28px;
}

.editor-actions button {
    width: 32px;
    height: 32px;
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    font-size: 22px;
    line-height: 22px;
    transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.editor-actions button:hover,
.editor-actions button:focus-visible {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: #ffffff;
    outline: 0;
}

.controls {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin: 22px 0 28px;
}

.display-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.55rem;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    background: var(--aid-panel);
    color: var(--aid-muted);
    font-family: var(--aid-font);
    transition: border-color 160ms ease, color 160ms ease;
}

.display-toggle span {
    width: 24px;
    height: 14px;
    padding: 2px;
    border-radius: 999px;
    background: #c5c5c5;
}

.display-toggle span::after {
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ffffff;
    content: "";
    transition: transform 160ms ease;
}

.display-toggle:hover,
.display-toggle:focus-visible,
.display-toggle.is-active {
    border-color: var(--color-primary);
    color: var(--color-primary);
    outline: 0;
}

.display-toggle.is-active span {
    background: var(--color-primary);
}

.display-toggle.is-active span::after {
    transform: translateX(10px);
}

fieldset {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

legend {
    float: left;
    margin-right: 6px;
    color: var(--color-accent);
    font-family: var(--font-header);
    font-weight: 600;
}

.mode-list {
    display: flex;
    gap: 4px;
}

.mode {
    min-width: 48px;
    padding: 6px 8px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-family: var(--aid-font);
    transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease;
}

.mode:hover,
.mode:focus-visible {
    border-color: var(--color-primary);
    outline: 0;
}

.mode.is-active {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: #ffffff;
}

.summary {
    margin: 0;
    color: var(--aid-muted);
    font-family: var(--aid-font);
    font-size: 14px;
}

.result-section {
    padding: 1.5rem;
    border: var(--aid-border);
    border-radius: var(--radius-md);
    background: var(--aid-panel);
    box-shadow: var(--shadow-md);
}

.result-heading {
    align-items: center;
    margin-bottom: 8px;
}

.view-tabs {
    display: flex;
    gap: 1rem;
}

.view-tab {
    padding: 0.25rem 0 0.4rem;
    border-bottom: 3px solid transparent;
    color: var(--aid-muted);
    font: 600 1rem/1.35 var(--font-header);
    transition: border-color 160ms ease, color 160ms ease;
}

.view-tab:hover,
.view-tab:focus-visible {
    color: var(--color-primary);
    outline: 0;
}

.view-tab.is-active {
    border-bottom-color: var(--color-primary);
    color: var(--color-accent);
}

.legend {
    display: flex;
    gap: 14px;
    color: var(--aid-muted);
    font-family: var(--aid-font);
    font-size: 13px;
}

.legend span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend i {
    width: 12px;
    height: 12px;
    border: 1px solid rgba(28, 27, 29, 0.6);
    border-radius: 2px;
}

.review-note,
.final-meta {
    margin: 0 0 0.65rem;
    color: var(--aid-muted);
    font-size: 0.9rem;
}

.review-note {
    font-family: var(--aid-font);
}

.final-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.final-meta p {
    margin: 0;
}

.final-meta button {
    flex: 0 0 auto;
    padding: 0.35rem 0.55rem;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    font-family: var(--aid-font);
}

.final-actions {
    display: flex;
    flex: 0 0 auto;
    gap: 0.5rem;
}

.final-meta .copy-final {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: #ffffff;
}

.final-meta .copy-final:hover,
.final-meta .copy-final:focus-visible {
    border-color: var(--color-primary);
    background: var(--color-primary);
}

.final-meta button:hover,
.final-meta button:focus-visible {
    background: var(--color-primary);
    color: #ffffff;
    outline: 0;
}

.added-key,
.result .added {
    background: var(--aid-added);
}

.removed-key,
.result .removed {
    background: var(--aid-removed);
}

.result {
    min-height: 220px;
    padding: 12px;
    border: var(--aid-editor-border);
    border-radius: var(--radius-sm);
    background: var(--aid-paper);
    caret-color: var(--color-primary);
    font-family: var(--aid-prose-font);
    font-size: 17px;
    line-height: 1.75;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
}

.result:focus-visible {
    border-color: var(--color-primary);
    outline: 0;
    box-shadow: var(--aid-focus);
}

.result .added,
.result .removed {
    outline: 1px solid;
    outline-offset: -1px;
}

.result button.added,
.result button.removed {
    display: inline;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    font: inherit;
    line-height: inherit;
    vertical-align: baseline;
    white-space: pre-wrap;
}

.result button.added:hover,
.result button.removed:hover,
.result button.added:focus-visible,
.result button.removed:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.result button.line-break-change:not(.is-absent) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.6rem;
    height: 1.25rem;
    margin: 0 0.12rem;
    padding: 0 0.28rem;
    border-radius: 3px;
    font-size: 0;
    line-height: 1;
    vertical-align: -0.08rem;
    white-space: normal;
}

.result button.line-break-change:not(.is-absent)::before {
    content: attr(data-label);
    color: var(--aid-ink);
    font: 600 0.7rem/1 var(--aid-font);
}

.result .is-selected {
    box-shadow: inset 0 -3px 0 rgba(0, 18, 83, 0.32);
}

.result .is-rejected {
    opacity: 0.48;
    text-decoration: line-through;
    text-decoration-thickness: 1px;
}

.result .is-hidden {
    display: none !important;
}

.result button.is-absent {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    margin: 0 0.1rem;
    position: relative;
    border-radius: 3px;
    font-size: 0;
    line-height: 1;
    opacity: 0.72;
    text-decoration: none;
    vertical-align: -0.08rem;
}

.result button.is-absent::before {
    content: "↶";
    color: var(--aid-ink);
    font: 600 0.72rem/1 var(--aid-font);
}

.result button.is-absent::after {
    width: max-content;
    max-width: min(360px, 80vw);
    padding: 0.35rem 0.5rem;
    position: absolute;
    bottom: calc(100% + 7px);
    left: 50%;
    z-index: 4;
    border-radius: var(--radius-sm);
    background: var(--color-accent);
    box-shadow: var(--shadow-md);
    color: #ffffff;
    content: attr(data-tooltip);
    font: 600 0.78rem/1.25 var(--font-body);
    opacity: 0;
    pointer-events: none;
    text-align: left;
    transform: translate(-50%, 2px);
    visibility: hidden;
    white-space: normal;
}

.result button.is-absent:hover::after,
.result button.is-absent:focus-visible::after {
    opacity: 1;
    transform: translate(-50%, 0);
    visibility: visible;
}

.result .manual {
    outline: 1px solid rgba(18, 101, 176, 0.62);
    outline-offset: -1px;
    background: rgba(30, 144, 255, 0.16);
    color: var(--aid-ink);
}

.result .manual-deletion {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.2em;
    margin: 0 0.08em;
    position: relative;
    outline: 1px dashed rgba(18, 101, 176, 0.72);
    outline-offset: -1px;
    background: rgba(30, 144, 255, 0.1);
    color: #1265b0;
    cursor: pointer;
    font: 600 0.85em/1.2 var(--aid-font);
    text-decoration: none;
    transition: background-color 160ms ease, outline-color 160ms ease;
}

.result .manual-deletion::after {
    width: max-content;
    max-width: min(360px, 80vw);
    padding: 0.35rem 0.5rem;
    position: absolute;
    bottom: calc(100% + 7px);
    left: 50%;
    z-index: 4;
    border-radius: var(--radius-sm);
    background: var(--color-accent);
    box-shadow: var(--shadow-md);
    color: #ffffff;
    content: attr(data-tooltip);
    font: 600 0.78rem/1.25 var(--font-body);
    opacity: 0;
    pointer-events: none;
    text-align: left;
    transform: translate(-50%, 2px);
    visibility: hidden;
    white-space: normal;
}

.result .manual-deletion:hover,
.result .manual-deletion:focus-visible {
    outline-color: #1265b0;
    background: rgba(30, 144, 255, 0.2);
}

.result .manual-deletion:hover::after,
.result .manual-deletion:focus-visible::after {
    opacity: 1;
    transform: translate(-50%, 0);
    visibility: visible;
}

.result .sentence {
    display: inline;
}

.result .sentence-reset {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.45em;
    height: 1.45em;
    margin: 0 0.2em 0 0.42em;
    padding: 0;
    border: 1px solid rgba(0, 18, 83, 0.24);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.72);
    color: var(--aid-muted);
    cursor: pointer;
    font: 600 0.78em/1 var(--aid-font);
    vertical-align: 0.08em;
}

.result .sentence-reset[hidden] {
    display: none;
}

.result .sentence-reset:hover,
.result .sentence-reset:focus-visible {
    border-color: var(--color-primary);
    background: rgba(30, 144, 255, 0.13);
    color: var(--color-primary);
    outline: 0;
}

.result .sentence-gap {
    display: inline;
}

.result .original-line-gap {
    white-space: pre-wrap;
}

.result.sentence-layout .sentence-gap {
    display: block;
    height: 0;
    font-size: 0;
}

.result.sentence-layout .sentence-gap.has-line-break {
    display: inline;
    height: auto;
    font-size: inherit;
}

.result.empty {
    display: grid;
    place-items: center;
    color: var(--aid-muted);
    text-align: center;
}

.final-text {
    min-height: 300px;
}

footer {
    margin-top: 18px;
    color: var(--aid-muted);
    font-family: var(--aid-font);
    font-size: 13px;
    text-align: right;
}

.entrance {
    animation: enter 320ms both;
}

.entrance-second {
    animation-delay: 60ms;
}

.entrance-third {
    animation-delay: 120ms;
}

.entrance-fourth {
    animation-delay: 180ms;
}

@keyframes enter {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
}

@media (prefers-reduced-motion: reduce) {
    .entrance {
        animation: none;
    }
}

@media (max-width: 700px) {
    body {
        padding: 1rem;
        border-width: 8px;
    }

    .editors {
        grid-template-columns: 1fr;
    }

    .editor-actions {
        flex-direction: row;
        justify-content: center;
        padding: 0;
    }

    .editors,
    .result-section {
        padding: 1rem;
    }

    textarea {
        min-height: 190px;
    }

    .controls {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }

    .final-meta {
        align-items: flex-start;
        flex-direction: column;
    }

    .final-actions {
        width: 100%;
    }
}

@media (max-width: 430px) {
    fieldset {
        align-items: flex-start;
        flex-direction: column;
    }

    .mode-list {
        width: 100%;
    }

    .mode {
        flex: 1;
    }

    .legend {
        gap: 8px;
    }
}