:root {
    /* kolory bazowe */
    --blue: #1a73e8;
    --blue-light: #e8f0fe;
    --blue-border: #b3c8f5;
    --blue-dark: #1558b0;
    --red: #d93025;
    --red-light: #fce8e6;
    --red-border: #f5c6c3;
    --orange: #f57c00;
    --orange-light: #fff8e1;
    --orange-border: #ffe082;
    --green: #188038;
    --green-light: #e6f4ea;
    --green-border: #a8d5b0;
    --gray-dark: #1a1a1a;
    --gray: #4a4a4a;
    --gray-border: #cfcfcf;
    --gray-bg: #f4f4f4;
    --white: #fff;

    /* kolory semantyczne */
    --color-primary: var(--blue);
    --color-primary-tint: var(--blue-light);
    --color-primary-border: var(--blue-border);
    --color-primary-dark: var(--blue-dark);
    --color-error: var(--red);
    --color-error-tint: var(--red-light);
    --color-error-border: var(--red-border);
    --color-warning: var(--orange);
    --color-warning-tint: var(--orange-light);
    --color-warning-border: var(--orange-border);
    --color-success: var(--green);
    --color-success-tint: var(--green-light);
    --color-success-border: var(--green-border);
    --color-text: var(--gray-dark);
    --color-muted: var(--gray);
    --color-subtle: var(--gray);
    --color-disabled: var(--gray-border);
    --color-border: var(--gray-border);
    --color-bg: var(--gray-bg);
    --color-bg-card: var(--white);
    --color-on-primary: #fff;
    --color-favorite: #f5c518;
    --radius: 4px;
    --transition: 0.15s;
}

/* --- Top nav bar (home + lang) --- */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.4rem;
    padding: 0.3rem 0.5rem;
    max-width: calc(1000px + 3rem);
    margin: 0 auto 0.25rem;
}

/* --- Home button --- */
.home-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    color: var(--color-muted);
    text-decoration: none;
    transition: color var(--transition);
}
.home-btn:hover {
    color: var(--color-primary);
}

/* --- Language switcher --- */
.lang-select {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 0.3rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-muted);
    max-width: 4.5rem;
    max-height: 2rem;
    transition:
        border-color var(--transition),
        color var(--transition);
}
.lang-select:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* --- Suppi donation button --- */
.suppi-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: opacity var(--transition);
}
.suppi-btn:hover {
    opacity: 0.8;
}

/* --- Dark mode tokens --- */
@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #6bb1ff;
        --color-primary-tint: #15314d;
        --color-primary-border: #3e6796;
        --color-primary-dark: #9ec9ff;
        --color-error: #f5a098;
        --color-error-tint: #3c1f1e;
        --color-error-border: #8a4a44;
        --color-warning: #f5b86b;
        --color-warning-tint: #3c2c14;
        --color-warning-border: #8a6a3a;
        --color-success: #95d5a8;
        --color-success-tint: #1e3328;
        --color-success-border: #4a8c5e;
        --color-text: #ececec;
        --color-muted: #c4c4c4;
        --color-subtle: #a0a0a0;
        --color-disabled: #3a3a3a;
        --color-border: #4a4a4a;
        --color-bg: #121212;
        --color-on-primary: #fff;
        --color-favorite: #f5c518;
        --color-bg-card: #1e1e1e;
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    text-align: center;
    font-family: sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    padding: clamp(0.5rem, 2vw, 1rem);
}

h1 {
    margin-bottom: 2rem;
}

h2 {
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-muted);
    margin-bottom: 1rem;
    margin-top: 1rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.4rem;
}

.section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 0.75rem;
    margin: 0 auto 0.75rem;
    max-width: calc(1000px + 3rem);
}

.section--narrow {
    max-width: calc(500px + 3rem);
}

.section--wide {
    max-width: calc(1500px + 3rem);
}

/* --- Subtitle --- */
.subtitle {
    color: var(--color-subtle);
    font-size: 1rem;
    margin: -1.5rem 0 2rem;
}

/* --- Labels & Inputs --- */
.field {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-bottom: 1rem;
}

label {
    font-size: 0.875rem;
    font-weight: 600;
}

label a {
    color: var(--color-primary);
    text-decoration: none;
}

label a:hover {
    text-decoration: underline;
}

.unit {
    font-size: 0.75rem;
    color: var(--color-subtle);
    font-weight: normal;
}

:is(input[type='number'], input[type='text'], select, textarea) {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: var(--color-bg-card);
    transition: border-color var(--transition);
}

input[type='number'] {
    text-align: right;
}

:is(input[type='number'], input[type='text'], select, textarea):focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-bg-card);
}

:is(input[type='number'], input[type='text']).error {
    border-color: var(--color-error);
}

.hint {
    font-size: 0.75rem;
    color: var(--color-subtle);
}

.error-msg {
    font-size: 0.75rem;
    color: var(--color-error);
}

/* --- Input with inline unit --- */
.input-unit {
    display: flex;
    align-items: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-bg-card);
}

.input-unit input {
    border: none;
    background: transparent;
    flex: 1;
    padding: 0.5rem 0.75rem;
}

.input-unit input:focus {
    outline: none;
}

.input-unit .unit-badge {
    padding: 0 0.75rem;
    background: var(--color-border);
    color: var(--color-muted);
    font-size: 0.85rem;
    border-left: 1px solid var(--color-border);
    white-space: nowrap;
    align-self: stretch;
    display: flex;
    align-items: center;
    user-select: none;
    transition:
        background var(--transition),
        color var(--transition);
}

.input-unit .unit-badge[data-units] {
    cursor: pointer;
}

.input-unit .unit-badge[data-units]:hover {
    background: var(--color-primary);
    color: var(--color-on-primary);
}

/* --- Buttons --- */
.btn-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

button {
    padding: 0.5rem 1.25rem;
    font-size: 0.95rem;
    border-radius: var(--radius);
    cursor: pointer;
    border: 1px solid transparent;
    transition:
        background var(--transition),
        border-color var(--transition);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg-card);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-secondary {
    background: var(--color-bg-card);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary-tint);
}

.btn-danger {
    background: var(--color-bg-card);
    color: var(--color-error);
    border-color: var(--color-error);
}

.btn-danger:hover {
    background: var(--color-error-tint);
}

button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* --- Shape selector --- */
.shape-select {
    margin-bottom: 1rem;
}

/* --- Calculator layout --- */
.two-columns,
.three-columns {
    display: grid;
    gap: 1rem;
    align-items: start;
}

.one-column {
    grid-template-columns: 1fr;
}
.two-columns {
    grid-template-columns: repeat(auto-fit, minmax(min(360px, 100%), 1fr));
}
.three-columns {
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
}

.inputs,
.formulas,
.results {
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.inputs > h2:first-child,
.formulas > h2:first-child,
.results > h2:first-child {
    margin-top: 0;
}

.results {
    gap: 0.5rem;
}

/* --- Formulas panel --- */
.formulas {
    font-size: 0.85rem;
    color: var(--color-muted);
}

/* --- Shape form visibility --- */
.shape-form {
    display: none;
}
.shape-form.active {
    display: block;
}

/* --- Shape icon --- */
.shape-icon {
    display: flex;
    justify-content: center;
    margin-bottom: 1.25rem;
}

/* --- SVG dimension icons --- */
/* blue: shape fills */
.svg-shape {
    fill: var(--color-primary-tint);
    stroke: var(--color-primary);
    stroke-width: 2;
}
.svg-shape-hidden {
    fill: none;
    stroke-dasharray: 3, 2;
    stroke: var(--color-primary);
    stroke-width: 2;
    opacity: 0.5;
}
.svg-hole {
    fill: var(--color-bg);
    stroke: var(--color-primary);
    stroke-width: 2;
}
/* green: dimension lines */
.svg-dim {
    fill: none;
    stroke: var(--green);
    stroke-width: 2;
}
.svg-label {
    fill: var(--green);
}

/* --- Web component display defaults (custom elements are inline by default) --- */
field-input,
field-select {
    display: block;
}
result-box,
formula-box {
    display: block;
}

/* --- Result box --- */
.result-box {
    background: var(--color-primary-tint);
    border: 1px solid var(--color-primary-border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    text-align: center;
}

.result-box.success {
    background: var(--color-success-tint);
    border-color: var(--color-success-border);
}

.result-box.success .result-value {
    color: var(--color-success);
}

.result-box.empty .result-value {
    color: var(--color-disabled);
}

.result-box .result-label {
    font-size: 0.8rem;
    color: var(--color-muted);
    margin-bottom: 0.25rem;
}

.result-box .result-value {
    font-size: 1.5rem;
    font-weight: 700;
    /* Use the darker primary so result-value reads at AAA contrast against the tinted box bg */
    color: var(--color-primary-dark);
}

.result-box .result-unit {
    font-size: 0.9rem;
    color: var(--color-muted);
    margin-left: 0.25rem;
}

.result-box.formula-box {
    text-align: left;
    line-height: 1.8;
    color: var(--color-muted);
}

/* --- Radio & Checkbox --- */
.radio-group,
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.radio-group label,
.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: normal;
    cursor: pointer;
}

/* --- Table --- */
table {
    width: auto;
    max-width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th {
    background: var(--color-bg);
    padding: 0.4rem 0.4rem;
    border-bottom: 2px solid var(--color-border);
    word-break: break-word;
}

td {
    padding: 0.4rem 0.4rem;
    border-bottom: 1px solid var(--color-border);
}

/* --- Layer cards (przenikanie ciepła) --- */
.layer-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    margin-bottom: 0.75rem;
    background: var(--color-bg);
}

.layer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.layer-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-muted);
}

.layer-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.layer-fields .field {
    margin-bottom: 0;
}

.btn-remove {
    background: none;
    border: 1px solid var(--color-error);
    color: var(--color-error);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.15rem 0.5rem;
    line-height: 1.4;
    transition:
        background var(--transition),
        color var(--transition);
}

.btn-remove:hover {
    background: var(--color-error-tint);
}

/* --- Visualization container --- */
.viz-container {
    width: 100%;
    aspect-ratio: 4 / 3;
    min-height: 150px;
    margin: 0 auto;
    border-radius: var(--radius);
    overflow: hidden;
    border: none;
    background: transparent;
}

.viz-container canvas,
.viz-container svg {
    display: block;
    width: 100% !important;
    height: 100% !important;
    background: transparent !important;
}

/* --- Dark mode: input text color --- */
@media (prefers-color-scheme: dark) {
    :is(input[type='number'], input[type='text'], select, textarea) {
        color: var(--color-text);
    }
}

/* --- #242 Manual dark/light mode override via data-theme --- */
[data-theme='dark'] {
    --color-on-primary: #fff;
    --color-favorite: #f5c518;
    --color-primary: #6bb1ff;
    --color-primary-tint: #15314d;
    --color-primary-border: #3e6796;
    --color-primary-dark: #9ec9ff;
    --color-error: #f5a098;
    --color-error-tint: #3c1f1e;
    --color-error-border: #8a4a44;
    --color-warning: #f5b86b;
    --color-warning-tint: #3c2c14;
    --color-warning-border: #8a6a3a;
    --color-success: #95d5a8;
    --color-success-tint: #1e3328;
    --color-success-border: #4a8c5e;
    --color-text: #ececec;
    --color-muted: #c4c4c4;
    --color-subtle: #a0a0a0;
    --color-disabled: #3a3a3a;
    --color-border: #4a4a4a;
    --color-bg: #121212;
    --color-bg-card: #1e1e1e;
}
[data-theme='dark'] :is(input[type='number'], input[type='text'], select, textarea) {
    color: var(--color-text);
}
[data-theme='light'] {
    --color-on-primary: #fff;
    --color-favorite: #f5c518;
    --color-primary: #1a73e8;
    --color-primary-tint: #e8f0fe;
    --color-primary-border: #b3c8f5;
    --color-primary-dark: #1558b0;
    --color-error: #c5221f;
    --color-error-tint: #fce8e6;
    --color-error-border: #f5c6c3;
    --color-warning: #f57c00;
    --color-warning-tint: #fff8e1;
    --color-warning-border: #ffe082;
    --color-success: #137333;
    --color-success-tint: #e6f4ea;
    --color-success-border: #a8d5b0;
    --color-text: #1a1a1a;
    --color-muted: #4a4a4a;
    --color-subtle: #4a4a4a;
    --color-disabled: #cfcfcf;
    --color-border: #cfcfcf;
    --color-bg: #f4f4f4;
    --color-bg-card: #fff;
}

/* --- #242 Theme toggle button --- */
.theme-toggle .icon-sun {
    display: none;
}
.theme-toggle .icon-moon {
    display: block;
}
@media (prefers-color-scheme: dark) {
    .theme-toggle .icon-sun {
        display: block;
    }
    .theme-toggle .icon-moon {
        display: none;
    }
}
[data-theme='dark'] .theme-toggle .icon-sun {
    display: block;
}
[data-theme='dark'] .theme-toggle .icon-moon {
    display: none;
}
[data-theme='light'] .theme-toggle .icon-sun {
    display: none;
}
[data-theme='light'] .theme-toggle .icon-moon {
    display: block;
}

/* --- Toolbar dropdown menu --- */
.toolbar-dropdown {
    position: relative;
}
.toolbar-menu {
    display: none;
    position: absolute;
    bottom: 100%;
    right: 0;
    margin-bottom: 0.4rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 140px;
    z-index: 300;
}
.toolbar-menu.open {
    display: block;
}
.toolbar-menu-item {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    text-align: left;
    background: none;
    border: none;
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
    color: var(--color-text);
    transition: background var(--transition);
}
.toolbar-menu-item:last-child {
    border-bottom: none;
}
.toolbar-menu-item:hover {
    background: var(--color-primary-tint);
}

/* --- #280 Embed button --- */
.embed-btn {
    font-size: 0.65rem;
    font-weight: 700;
    font-family: monospace;
}

/* --- #252 Fullscreen button --- */

/* --- #249 Copy result button --- */
.copy-btn {
    position: absolute;
    top: 0.4rem;
    right: 0.4rem;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--color-muted);
    opacity: 0;
    transition:
        opacity var(--transition),
        color var(--transition);
    line-height: 1;
}
.result-box:hover .copy-btn {
    opacity: 0.6;
}
.copy-btn:hover {
    opacity: 1 !important;
    color: var(--color-primary);
}
.copy-btn.copied {
    opacity: 1 !important;
    color: var(--color-success);
}

/* --- Fixed bottom toolbar (mobile-friendly) --- */
.bottom-toolbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.4rem 0.75rem;
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
    gap: 0.4rem;
}
.bottom-toolbar-left {
    display: flex;
    align-items: center;
}
.bottom-toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
/* Ensure body has padding so content isn't hidden behind toolbar */
body.has-bottom-toolbar {
    padding-bottom: 3.5rem !important;
}

/* --- #283 Report bug button --- */
.report-bug-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.6rem;
    font-size: 0.7rem;
    color: var(--color-muted);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-decoration: none;
    transition:
        border-color var(--transition),
        color var(--transition);
}
.report-bug-btn:hover {
    border-color: var(--color-error);
    color: var(--color-error);
}

/* --- Toolbar icon buttons (share, embed, fullscreen, theme) --- */
.toolbar-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    color: var(--color-muted);
    transition:
        border-color var(--transition),
        color var(--transition);
}
.toolbar-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* --- #393 Share button --- */
.share-btn.copied {
    border-color: var(--color-success);
    color: var(--color-success);
}

/* --- #268 Range validity warnings --- */
.range-warning {
    display: block;
    font-size: 0.7rem;
    color: var(--color-warning);
    margin-top: 0.2rem;
}
input.warning {
    border-color: var(--color-warning) !important;
}

/* --- #438 Skip-to-content link --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    z-index: 9999;
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: var(--color-on-primary);
    font-size: 0.9rem;
    text-decoration: none;
    border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus {
    top: 0;
}

/* --- #267 Verified badge --- */
.verified-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.7rem;
    color: var(--color-success);
    background: var(--color-success-tint);
    border: 1px solid var(--color-success-border);
    border-radius: 12px;
    padding: 0.15rem 0.6rem;
    margin-left: 0.5rem;
    vertical-align: middle;
    font-weight: 600;
}

/* --- #243 Favorites star button --- */
.fav-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--color-disabled);
    margin-left: 0.5rem;
    vertical-align: middle;
    transition:
        color var(--transition),
        transform var(--transition);
    line-height: 1;
}
.fav-btn:hover {
    color: var(--color-favorite);
    transform: scale(1.2);
}
.fav-btn.active {
    color: var(--color-favorite);
}

/* --- #265 Standards citation section --- */
.standards-section {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--color-muted);
    text-align: left;
}
.standards-section h3 {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--color-text);
    border-bottom: none;
    text-transform: none;
    letter-spacing: normal;
}
.standards-section ul {
    list-style: none;
    padding: 0;
}
.standards-section li {
    padding: 0.2rem 0;
}
.standards-section li::before {
    content: '📐 ';
}

/* --- #250 Breadcrumbs --- */
.breadcrumb {
    text-align: left;
    max-width: calc(1000px + 3rem);
    margin: 0 auto 0.5rem;
    font-size: 0.8rem;
    color: var(--color-muted);
}
.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
}
.breadcrumb a:hover {
    text-decoration: underline;
}
.breadcrumb .sep {
    margin: 0 0.3rem;
    color: var(--color-disabled);
}

/* --- #245 Keyboard shortcut help overlay --- */
.shortcut-help {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1000;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    text-align: left;
    min-width: 200px;
    cursor: pointer;
}
.shortcut-help h3 {
    margin-bottom: 0.75rem;
}
.shortcut-help table {
    width: 100%;
}
.shortcut-help td {
    padding: 0.25rem 0.5rem;
    font-size: 0.85rem;
}
.shortcut-help kbd {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    font-size: 0.8rem;
    font-family: monospace;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 3px;
}

/* --- #257 Related calculators --- */
.related-section {
    text-align: center;
}
.related-links {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}
.related-chip {
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
    border-radius: 16px;
    background: var(--color-primary-tint);
    color: var(--color-primary);
    text-decoration: none;
    border: 1px solid var(--color-primary-border);
    transition:
        background var(--transition),
        color var(--transition);
}
.related-chip:hover {
    background: var(--color-primary);
    color: var(--color-on-primary);
}

/* --- #269 Page version info --- */
.page-version {
    text-align: center;
    font-size: 0.65rem;
    color: var(--color-disabled);
    margin-top: 1.5rem;
    padding-bottom: 0.5rem;
}

/* --- #263 Bigger touch targets on mobile --- */
@media (max-width: 600px) {
    :is(input[type='number'], input[type='text'], select, textarea) {
        padding: 0.65rem 0.75rem;
        font-size: 1rem;
    }
    .input-unit input {
        padding: 0.65rem 0.75rem;
    }
    .input-unit .unit-badge {
        padding: 0 0.85rem;
        font-size: 0.9rem;
        min-height: 2.5rem;
    }
    button,
    .btn-primary,
    .btn-secondary {
        padding: 0.65rem 1.25rem;
        font-size: 1rem;
    }
}

/* --- Contact page --- */
.contact-card {
    text-align: center;
    padding: 1.5rem;
}
.contact-card .profile-photo {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 1rem;
    display: block;
    border: 3px solid var(--color-primary, #1a73e8);
}
.contact-card h1 {
    margin: 0.5rem 0 0.25rem;
    font-size: 1.4rem;
}
.contact-card a[href^='mailto:'] {
    color: var(--color-primary, #1a73e8);
    text-decoration: none;
    font-weight: 500;
}
.contact-card a[href^='mailto:']:hover {
    text-decoration: underline;
}
.contact-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border, #ddd);
    border-radius: var(--radius, 6px);
    background: var(--color-bg-card, #fff);
    color: var(--color-text, #222);
    text-decoration: none;
    font-size: 0.9rem;
    transition:
        border-color 0.15s,
        color 0.15s;
}
.contact-action-btn:hover {
    border-color: var(--color-primary, #1a73e8);
    color: var(--color-primary, #1a73e8);
}

/* --- #445 Print-friendly output --- */
@media print {
    .home-btn,
    .lang-select,
    .suppi-btn,
    .bottom-toolbar,
    .copy-btn,
    .skip-link {
        display: none !important;
    }
    body {
        padding: 0;
        padding-bottom: 0 !important;
        background: #fff;
        color: #000;
    }
    .section {
        border: 1px solid #ccc;
        box-shadow: none;
    }
    .result-box {
        break-inside: avoid;
    }
    .input-unit .unit-badge {
        background: #eee;
        color: #333;
    }
}