/* Root styles */

:root, .dark {
    --primary-color: #a259e6;
    --primary-color-alt: #c179ff;

    --bg-color: #2d193c;
    --bg-color-alt: #1a1a2e;
    --bg-gradient: linear-gradient(135deg, var(--bg-color), var(--bg-color-alt));

    --secondary-bg-color: #222222;
    --secondary-bg-color-alt: #333333;

    --text-color: #d3d3d3;
    --text-color-alt: #ffffff;

    /* Based on: https://www.joshwcomeau.com/shadow-palette/ */
    --shadow-color: 269deg 60% 6%;
    --shadow:
        0.3px 0.5px 0.7px hsl(var(--shadow-color) / 0.36),
        0.8px 1.6px 2px -0.8px hsl(var(--shadow-color) / 0.36),
        2.1px 4.1px 5.2px -1.7px hsl(var(--shadow-color) / 0.36),
        5px 10px 12.6px -2.5px hsl(var(--shadow-color) / 0.36);
    --inner-shadow: inset 1px 2px 4px hsl(var(--shadow-color) / 0.36);

    --border-color: #444444;
    --border: 1px solid var(--border-color);

    --border-radius: 0.5rem;

    --content-width: 25rem;
}

.light {
    --primary-color: #7c3aed;
    --primary-color-alt: #6200ca;

    --bg-color: #f3e8ff;
    --bg-color-alt: #e0e7ff;

    --secondary-bg-color: #fafafa;
    --secondary-bg-color-alt: #ffffff;

    --text-color: #2d193c;
    --text-color-alt: #000000;

    --shadow-color: 261deg 31% 60%;

    --border-color: #cccccc;
}

html {
    font-size: 20px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--secondary-bg-color) var(--bg-gradient) no-repeat center center fixed;
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

/* This is a workaround for a bug with PWAs on iOS where fixed background images/gradients are not the full height of the viewport. */
/* This results in a weird patch of non-gradient background at the bottom of the viewport for pages that aren't longer than the device's viewport. */
/* This workaround sets the gradient to vertical and sets the background color to the end color of the gradient. */
/* This makes it so that you can't see the seam where the gradient ends and the static color begins. */
@supports (-webkit-touch-callout: none) {
    @media (display-mode: standalone) {
        :root {
            --bg-gradient: linear-gradient(180deg, var(--bg-color), var(--bg-color-alt));
        }

        html {
            background: var(--bg-color-alt) var(--bg-gradient) no-repeat center center fixed;
        }
    }
}

body {
    margin: 0;
    padding-top: calc(1rem + env(safe-area-inset-top));
    padding-bottom: calc(1rem + env(safe-area-inset-bottom));
    padding-left: calc(1rem + env(safe-area-inset-left));
    padding-right: calc(1rem + env(safe-area-inset-right));
}

* {
    box-sizing: border-box;
}

a {
    color: var(--primary-color);
    text-underline-offset: 0.125rem;
}

a:hover {
    color: var(--primary-color-alt);
}

@media (display-mode: standalone) {
    html {
        overscroll-behavior: none;
    }
}

/* Floating buttons */

#theme-toggle, #repo-link {
    position: absolute;
    top: calc(1rem + env(safe-area-inset-top));
    z-index: 1000;
    background: var(--secondary-bg-color);
    color: var(--text-color);
    border: none;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0.5rem;
    border: var(--border);
    box-shadow: var(--shadow);
    cursor: pointer;
    touch-action: manipulation;
}

#theme-toggle {
    right: calc(1rem + env(safe-area-inset-right));
}

#repo-link {
    right: calc(4rem + env(safe-area-inset-right));
}

#theme-toggle:hover, #repo-link:hover {
    background: var(--secondary-bg-color-alt);
}

#theme-toggle svg, #repo-link svg {
    width: 100%;
    height: 100%;
}

.dark .icon-dark {
    display: none;
}

.light .icon-light {
    display: none;
}

/* Main content */

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: max(3rem, 10vh);
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    margin: 0;
    text-align: center;
}

input[type="text"] {
    width: 100%;
    max-width: var(--content-width);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: none;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
    background: var(--secondary-bg-color);
    color: var(--text-color-alt);
    border: var(--border);
    box-shadow: var(--shadow), var(--inner-shadow);
}

input[type="text"]:focus {
    outline: 2px solid var(--primary-color);
}

/* Footer */

footer {
    width: 100%;
    text-align: center;
    font-size: 1rem;
    margin-top: 2rem;
}

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

/* Conversion output */

#result {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.conversion-card {
    width: 100%;
    max-width: var(--content-width);
    padding: 1rem;
    background: var(--secondary-bg-color);
    border: var(--border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);

    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    justify-content: center;
}

.card-side {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.card-number {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary-color);
}

.card-unit {
    font-size: 1rem;
    color: var(--text-color);
    margin-top: 0.5rem;
}

.card-arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0.5rem;
}

.card-arrow svg {
    width: 1em;
    height: 1em;
}

.card-text {
    grid-column: 1 / -1;
}