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Niveus: a tactile, adaptive interface language
Bevelled controls with light falling across them, fields as wells, solid windows, and glass kept for the chrome that floats over everything else. Warm graphite in dark, soft paper in light, one brand color driving both. Ships its own fonts (Instrument Sans, JetBrains Mono; OFL). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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175
niveus/components/card.css
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175
niveus/components/card.css
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/* ==========================================================================
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Niveus — Card
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--------------------------------------------------------------------------
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.nv-card resting surface, elevation 1
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.nv-card--elevated separated from its context, elevation 2
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.nv-card--inset recessed into its parent
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.nv-card--frosted over imagery or scrolling content
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.nv-card--interactive the whole card is one target
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.nv-card__header / __body / __footer / __media
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A card is a container, not a look. If a card needs a shadow that is not on
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the elevation scale, the answer is a different elevation — not a different
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shadow.
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========================================================================== */
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.nv-card {
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--_bg: var(--nv-color-surface);
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--_border: var(--nv-color-border-subtle);
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--_shadow: var(--nv-bevel), var(--nv-outline), var(--nv-elevation-1);
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--_sheen: var(--nv-sheen-surface);
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--_padding: var(--nv-space-5);
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position: relative;
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display: flex;
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flex-direction: column;
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min-inline-size: 0;
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background-color: var(--_bg);
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background-image: var(--_sheen);
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color: var(--nv-color-text-primary);
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border: var(--nv-border-width) solid var(--_border);
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border-radius: var(--nv-radius-lg);
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box-shadow: var(--_shadow);
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/* Children are clipped to the corner radius so media and inset regions
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cannot square off the card. */
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overflow: hidden;
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transition: var(--nv-transition-surface);
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}
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.nv-card--elevated {
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--_bg: var(--nv-color-surface-elevated);
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--_shadow: var(--nv-bevel), var(--nv-outline), var(--nv-elevation-2);
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}
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.nv-card--floating {
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--_bg: var(--nv-color-surface-elevated);
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--_shadow: var(--nv-bevel), var(--nv-outline), var(--nv-elevation-3);
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}
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.nv-card--inset {
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--_bg: var(--nv-color-surface-inset);
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--_shadow: var(--nv-elevation-inset-md), var(--nv-ledge);
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--_sheen: none;
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--_border: var(--nv-color-border-subtle);
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}
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.nv-card--frosted {
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--_bg: var(--nv-material-frosted-bg);
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--_border: var(--nv-material-frosted-border);
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--_shadow: var(--nv-material-frosted-shadow);
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--_sheen: none;
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backdrop-filter: var(--nv-backdrop-frosted);
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-webkit-backdrop-filter: var(--nv-backdrop-frosted);
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}
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.nv-card--flush {
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--_padding: 0;
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}
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/* --- Interactive ------------------------------------------------------------
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Rises on hover and sinks on press, exactly like a button — one physical
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language for anything that responds to a pointer. */
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.nv-card--interactive {
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cursor: pointer;
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text-align: start;
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text-decoration: none;
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}
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@media (hover: hover) {
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.nv-card--interactive:hover {
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box-shadow: var(--nv-bevel), var(--nv-outline), var(--nv-elevation-3);
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translate: 0 calc(var(--nv-lift-hover) * 2);
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}
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}
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.nv-card--interactive:active {
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box-shadow: var(--nv-bevel), var(--nv-outline), var(--nv-elevation-1);
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translate: 0 var(--nv-press-depth);
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transition-duration: var(--nv-duration-instant);
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}
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.nv-card--interactive:focus-visible {
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outline: none;
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box-shadow: var(--_shadow), var(--nv-focus-ring);
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}
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/* Cards whose whole area is clickable via a link inside: the link's target is
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stretched over the card, so the markup stays semantic and only the link text
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is announced. */
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.nv-card__link::after {
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content: "";
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position: absolute;
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inset: 0;
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}
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/* --- Parts ------------------------------------------------------------------- */
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.nv-card__header {
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display: flex;
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align-items: flex-start;
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justify-content: space-between;
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gap: var(--nv-space-4);
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padding: var(--_padding);
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padding-block-end: var(--nv-space-3);
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}
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.nv-card__title {
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font: var(--nv-font-title);
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letter-spacing: var(--nv-letter-spacing-tight);
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margin: 0;
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}
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.nv-card__subtitle {
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font: var(--nv-font-caption);
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color: var(--nv-color-text-secondary);
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margin-block-start: var(--nv-space-1);
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}
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.nv-card__body {
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flex: 1;
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padding: var(--_padding);
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color: var(--nv-color-text-secondary);
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font: var(--nv-font-body);
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}
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/* A header already opened the block, so the body should not open it again. */
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.nv-card__header + .nv-card__body {
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padding-block-start: 0;
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}
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.nv-card__footer {
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display: flex;
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align-items: center;
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gap: var(--nv-space-2);
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padding: var(--_padding);
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padding-block-start: var(--nv-space-3);
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border-block-start: var(--nv-border-width) solid var(--nv-color-border-subtle);
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margin-block-start: auto;
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}
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.nv-card__footer--plain {
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border-block-start: 0;
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padding-block-start: 0;
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}
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.nv-card__media {
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display: block;
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inline-size: 100%;
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aspect-ratio: 16 / 9;
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object-fit: cover;
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background-color: var(--nv-color-surface-inset);
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}
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/* --- Group ---------------------------------------------------------------------
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Equal-height cards on one rhythm, collapsing to a single column without a
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media query. */
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.nv-card-grid {
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display: grid;
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grid-template-columns: repeat(auto-fit, minmax(min(18rem, 100%), 1fr));
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gap: var(--nv-space-4);
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align-items: stretch;
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}
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