/* SYSTEM THEMING: Base + 4 Themes */

/* Base: default is "UnitMatrix Sky" */
:root {
    --bg: #eef7ff;
    --bg-alt: #d9efff;
    --panel: #ffffff;
    --text: #1f2933;
    --text-subtle: #4e657a;
    --border: #b9d4e6;
    --highlight: #e0f5ff;
    --logo-blue: #37a4ff;
    --tile-bg: #d9efff;
    --tile-border: #b9d4e6;
    --accent-yellow: #ffd952;
    --panel-max-width: 474px;
    --matrix-gap: 14px;
    --radius: 10px;}

/* UnitMatrix Sky - default light theme, light blue */
:root[data-theme="sky"] {
    --bg: #eef7ff;
    --bg-alt: #d9efff;
    --panel: #ffffff;
    --text: #1f2933;
    --text-subtle: #4e657a;
    --border: #b9d4e6;
    --highlight: #e0f5ff;
    --tile-bg: #d9efff;
    --tile-border: #b9d4e6;
    --accent-yellow: #ffd952;
}

/* UnitMatrix Space – default dark theme, navy blue */
:root[data-theme="space"] {
    --bg: #0b1624;
    --bg-alt: #111c2f;
    --panel: #18263b;
    --text: #e5e9f0;
    --text-subtle: #9aa6b2;
    --border: #415a77;
    --highlight: #1f5f8b;
    --tile-bg: #111c2f;
    --tile-border: #415a77;
    --accent-yellow: #ffd952;
}

/* UnitMatrix Solar – warm light yellow */
:root[data-theme="solar"] {
    --bg: #fff8e6;
    --bg-alt: #ffecc2;
    --panel: #ffffff;
    --text: #3b2f1b;
    --text-subtle: #7a5c2b;
    --border: #f3d08a;
    --highlight: #fff2c2;
    --tile-bg: #ffecc2;
    --tile-border: #f3d08a;
    --accent-yellow: #56b9ff;
}

/* UnitMatrix Sylvan - light green */
:root[data-theme="sylvan"] {
    --bg: #f2f9f2;
    --bg-alt: #e1f3e1;
    --panel: #ffffff;
    --text: #1b2b1b;
    --text-subtle: #4d6b4d;
    --border: #b6d8b6;
    --highlight: #d2efd2;
    --tile-bg: #e1f3e1;
    --tile-border: #b6d8b6;
    --accent-yellow: #ffd952;
}

/* UnitMatrix Strawberry - light pink */
:root[data-theme="strawberry"] {
    --bg: #fff4f6;
    --bg-alt: #ffe3e8;
    --panel: #ffffff;
    --text: #4a1e25;
    --text-subtle: #82535c;
    --border: #f5c5cd;
    --highlight: #ffd6df;
    --tile-bg: #ffe3e8;
    --tile-border: #f5c5cd;
    --accent-yellow: #ffd952;
}

/* Fonts */
@font-face {
    font-family: "Inter";
    src: url("../fonts/inter/Inter-Regular.woff2") format("woff2");
    font-weight: 400;
    font-style: normal;
}

@font-face {
    font-family: "Inter Tight";
    src: url("../fonts/inter/inter-tight-latin-400-normal.woff2") format("woff2");
    font-weight: 400;
    font-style: normal;
}

/* Global reset / layout */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    display: flex;
    flex-direction: column;
}

.page-wrapper {
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

/* Main layout */
.main {
    margin: 0;
    padding: 24px 12px 40px;
    display: flex;
    flex-direction: column; /* stack by default */
    flex: 1 0 auto;
    gap: 24px;
}

/* Panels */
.panel {
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--panel);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
    width: 100%;
    max-width: 100%; /* stack full-width on mobile */
}

.unitmatrix-panel {
    position: relative;
    padding-bottom: 32px;
}

/* ≥ 768px: two panels side by side */
@media (min-width: 768px) {
    .main {
        flex-direction: row;
        justify-content: center;
        align-items: flex-start;
        padding-left: 24px;
        padding-right: 24px;

        max-width: calc(2 * var(--panel-max-width) + 24px);
        margin: 0 auto;
    }

    .panel {
        width: auto;
        max-width: var(--panel-max-width);
        flex: 1 1 var(--panel-max-width);
    }
}

/* Matrix grid */
.unitmatrix-grid,
.unitmatrix-extra {
    display: grid;
    grid-template-columns: repeat(4, minmax(72px, 96px));
    gap: var(--matrix-gap);
    justify-content: center;
}

.unitmatrix-extra {
    margin-top: 24px;
}

.unitmatrix-extra[hidden] {
    display: none !important;
}

/* Category buttons */
.cat-btn {
    background: var(--tile-bg);
    border-radius: var(--radius);
    border: 1px solid var(--tile-border);
    cursor: pointer;
    color: var(--text);

    display: flex;
    flex-direction: column; /* icon above text */
    align-items: center;
    justify-content: center;
    text-align: center;

    width: 100%;
    aspect-ratio: 1 / 1;

    padding: 10px;
    font-size: 13px;

    transition:
            background-color 0.15s ease,
            border-color 0.15s ease,
            transform 0.15s ease,
            box-shadow 0.15s ease;
}

.cat-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.12);
}

.cat-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px rgba(55, 164, 255, 0.6);
    transform: translateY(-1px);
}

.cat-btn.active {
    background: var(--accent-yellow);
    border-color: var(--accent-yellow);
    color: #1a1a1a;
}

.cat-icon {
    width: 34px;
    height: 34px;
    margin-bottom: 10px;

    display: flex;
    align-items: center;
    justify-content: center;
}

.cat-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
    display: block;
}

.cat-label {
    margin-top: 2px;
    font-size: 13px;
    line-height: 1.2;
}

/* Matrix toggle */
.matrix-toggle {
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translate(-50%, 50%);
    margin: 0;

    display: block;
    padding: 6px 14px;
    border-radius: 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    z-index: 2;

    transition: background-color 0.2s, border-color 0.2s;
}

.matrix-toggle:hover {
    background: var(--highlight);
}

.matrix-toggle:focus-visible {
    outline: none;
    border-color: var(--tile-border);
    box-shadow: 0 0 0 2px rgba(55, 164, 255, 0.3);
}

/* Header + footer */
header {
    background: var(--bg-alt);
    color: var(--text);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px 10px;
    border-bottom: 1px solid var(--border);
}

.header-left {
    display: flex;
    align-items: center;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-row {
    display: flex;
    align-items: baseline;
    gap: 16px;
}

.logo-row svg {
    height: 60px;
    width: auto;
}

.tagline {
    font-family: "Inter", system-ui, sans-serif;
    font-size: 20px;
    line-height: 1;
    color: var(--text);
    position: relative;
    top: 4px;
}

.footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
    color: var(--text);

    display: flex;
    flex-shrink: 0;
    justify-content: space-between;
    align-items: center;
    gap: 24px;

    font-size: 12px;
    opacity: 0.7;
}

.footer a {
    color: var(--logo-blue);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.footer-left {
    text-align: left;
    flex: 1 1 auto;
}

.footer-right {
    text-align: right;
    white-space: nowrap;
}

@media (max-width: 600px) {
    .footer {
        flex-direction: column;
        text-align: center;
    }

    .footer-left,
    .footer-right {
        text-align: center;
        width: 100%;
    }
}

/* Headings inside panels */
.panel > h1 {
    margin-top: 0;
    margin-bottom: 16px;
    font-size: 1.5rem;
}

.panel > h2 {
    margin-top: 0;
    margin-bottom: 16px;
    font-size: 1rem;
}

/* Form elements */

select {
    appearance: none;
    -webkit-appearance: none;

    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: var(--panel);
    color: var(--text);

    padding: 8px 36px 8px 12px;
    cursor: pointer;
    transition:
            border-color 0.2s,
            background-color 0.2s,
            box-shadow 0.2s;
}

input,
select {
    background: var(--panel);
    color: var(--text);
    border: 1px solid var(--border);
}

input:hover,
select:hover {
    background: var(--highlight);
}

/* Language + theme selects */

.lang-select-wrapper,
.theme-select-wrapper {
    position: relative;
    display: inline-block;
}

.lang-select,
.theme-select {
    padding: 6px 32px 6px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    font-size: 14px;

    appearance: none;
    -webkit-appearance: none;

    background-image: url("data:image/svg+xml;utf8,\
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23aaa'>\
<path d='M7 10l5 5 5-5z'/>\
</svg>");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 14px;
}

.lang-select:focus,
.theme-select:focus {
    outline: none;
    border-color: var(--logo-blue);
    box-shadow: 0 0 0 2px rgba(55, 164, 255, 0.3);
}

/* Slightly brighter arrow when system prefers dark – optional cosmetic tweak */
@media (prefers-color-scheme: dark) {
    .lang-select,
    .theme-select {
        background-image: url("data:image/svg+xml;utf8,\
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23ccc'>\
<path d='M7 10l5 5 5-5z'/>\
</svg>");
    }
}

/* Converter */

.converter-box {
    background: var(--panel);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    display: grid;
    gap: 12px;
}

.converter-box label {
    font-size: 13px;
    opacity: 0.6;
}

.converter-box select,
.converter-box input {
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    font-size: 16px;
}

.conversion-summary {
    margin-top: 8px;
    font-size: 14px;
    opacity: 0.75;
}

.converter-actions {
    margin-top: 4px;
    display: flex;
    justify-content: flex-end;   /* nur rechtsbündig */
    align-items: center;
    gap: 8px;
    font-size: 13px;
    opacity: 0.85;
}

.converter-actions-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Copy-Button bleibt wie bisher */
.copy-btn {
    padding: 6px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.copy-btn:hover {
    background: var(--highlight);
    border-color: var(--logo-blue);
    box-shadow: 0 0 0 1px rgba(55, 164, 255, 0.2);
}

.swap-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    font-size: 16px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.swap-btn:hover {
    background: var(--highlight);
    border-color: var(--logo-blue);
    box-shadow: 0 0 0 1px rgba(55, 164, 255, 0.2);
}

.swap-btn:focus-visible {
    outline: none;
    border-color: var(--logo-blue);
    box-shadow: 0 0 0 2px rgba(55, 164, 255, 0.4);
}



.section-title {
    margin: 0 0 12px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-subtle);
}

/* Modal */

.modal {
    position: fixed;
    inset: 0;
    display: none;                 /* hidden by default */
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.is-open {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
}

.modal-dialog {
    position: relative;
    z-index: 1;
    max-width: 520px;
    width: calc(100% - 32px);
    background: var(--panel);
    color: var(--text);
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.4);
    padding: 20px 24px 22px;
}

.modal-dialog h2 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.modal-dialog p {
    margin: 8px 0;
    font-size: 0.95rem;
    line-height: 1.5;
}

.modal-close {
    position: absolute;
    top: 8px;
    right: 10px;
    border: none;
    background: transparent;
    color: var(--text-subtle);
    font-size: 22px;
    cursor: pointer;
    padding: 2px 6px;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text);
}

.modal-close:focus-visible {
    outline: none;
    border-radius: 999px;
    box-shadow: 0 0 0 2px rgba(55, 164, 255, 0.4);
}

/* Footer link style tweak */
#footerLinks a {
    color: var(--logo-blue);
    text-decoration: none;
}

#footerLinks a:hover {
    text-decoration: underline;
}

/* Support modal buttons */

.support-button-row {
    margin-top: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.support-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 0.9rem;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
}

.support-button-primary {
    background: var(--logo-blue);
    color: #ffffff;
    border-color: var(--logo-blue);
}

.support-button-primary:hover {
    background: #1f8be0;
    border-color: #1f8be0;
}

.support-button-secondary {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}

.support-button-secondary:hover {
    background: var(--highlight);
}
/* Visually hidden text */

.sr-only {
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}